JP2012140233A - Fall-prevention work for crane truck - Google Patents

Abstract

A crash guard for a crane vehicle capable of easily starting, storing and locking a guard post is provided.
Each of the guard posts 20 to 22 located on one side of a straight line connecting pivot pins 17 to 19 in both the state where the guard posts 20 to 22 are tilted in parallel with the main boom 12 and the state in which the guard posts 20 to 22 are raised vertically. The first rigging fastening portions 29 / 34a and 34b / 41 integral with the guard posts 20 to 22 are provided at positions around the lower end portion of the 22 and the second rigging fastening portion 30 / is provided at a position symmetrical to them. 35a and 35b / 42 are provided. The first rigging fastening portions and the second rigging fastening portions of the guard posts 20 and 21 and the guard posts 21 and 22 adjacent to each other by the rigging 46 to 49, or the first rigging fastening. The landing portion and the second rigging fastening portion are connected, and the other guard posts 21 and 22 are swung simultaneously in conjunction with the rocking of the guard post 20 on the base side.
[Selection] Figure 4

Description

  The present invention relates to an improvement in a crash protection for a crane vehicle.

Patent document is a crash protection work for a crane vehicle in which a lifeline is stretched over the upper end of a guard post that is slidably attached to each of a plurality of brackets fixed at intervals along the length of the boom. Known as 1.
In this crane car crash protector, all guard posts are projected from the upper surface of the boom during use, and the guard posts are fixed to the brackets with positioning pins that penetrate the brackets and guard posts. The guard post is retracted from the upper surface to the lower surface side of the boom, so that most of the guard post is retracted into the space in the boom.
In the crash protection work for crane trucks disclosed in Patent Document 1, annular bodies for passing wires for moving the guard posts up and down are fixed to the lower ends of all guard posts, and the inside of these annular bodies is attached to the boom. One end of the wire that is stretched in one direction along the longitudinal direction is fixed to a fixing clasp fixed to the boom at a height substantially equal to the upper surface of the boom, The other end of the wire is detachably secured to another temporary fixing clasp via the upper side of the sheave attached to the boom so as to be rotatable at substantially the same height as the upper surface of the boom. ing.
The wire fixed to the fixing clasp is in the longitudinal direction of the boom when the guard post is retracted, that is, when all the guard posts are slid from the upper surface to the lower surface of the boom to the limit position. It has enough length to fasten all the annular bodies lined up along with the above-mentioned sheave to the clasp for temporarily fixing, and when storing the crash protector for crane vehicles, The other end of the wire is fixed to a temporary fixing clasp.
Accordingly, in the retracted state of the crane car crash protector, most of the wire is positioned below the upper surface of the boom at a distance comparable to the entire length of the guard post and is substantially parallel to the boom. It becomes a state.
To start up the crane car crash protection work, remove the other end of the wire from the temporary fixing clasp described above, connect the main or auxiliary winding wire of the crane car to this part, and pull it with a winch. Is done by.
One end of the wire is fastened to a fixing clasp fixed to the boom at a height approximately equal to the top surface of the boom, and the other end of the wire is rotatable at a height approximately equal to the top surface of the boom As a result of being pulled through the upper side of the sheave attached to the boom, when the wire starts to be pulled, the wire located below the upper surface of the boom at a distance comparable to the total length of the guard post Gradually approaching the top surface of the boom while maintaining a state of being substantially parallel to the boom, each of the annular bodies through the wires gradually approaches the top surface of the boom, and each of the guard posts integral with the annular body is the boom. It will protrude from the top surface of.
And finally, with each of the guard posts protruding from the upper surface of the boom to the limit position, the worker walks over the boom while passing through the positioning pins one after another through each bracket and guard post, Fix each guard post to the bracket, remove the main winding wire or auxiliary winding wire from the other end of the wire, and detachably fix the other end of the wire to an appropriate place on the boom so that the wire does not get in the way .
However, in the crash protection work for a crane vehicle having such a configuration, the worker walks over the boom in an unstable state where the annular body at the lower end of the guard post is supported only by the wire tension, and the positioning pin is attached. Have to worry about work. More precisely, regarding the two guard posts located at both ends of the plurality of guard posts, that is, the guard posts closest to the fixing clasp or sheave, there is a concern that the guard posts may move up and down due to loosening of the wires. Although there are few, especially in the guard post located in the center, the annular body is elastically supported by the center of the string fixed at both ends, and it is easy even if the tension of the wire is strong. Because it is in a situation where it moves up and down, there is anxiety about vertical movement.
For the same reason, when the guard posts are projected using the tension of the wire, there is no particular problem with the two guard posts located at both ends, but there is a problem with the guard posts located at the center. For example, when the lifting force due to the wire tension does not work sufficiently, for example, when rust or galling occurs on the guard post or bracket, it becomes difficult to protrude the guard post to the limit position with the wire tension. In addition to the work for attaching the positioning pins, the operator must also perform work such as pulling up the card post with insufficient protrusion on the boom, which increases the anxiety of the work.
When storing the crane car crash protector, the guard post should be lowered by its own weight if the positioning pin is removed and the wire is loosened. If there is rust or galling on the surface, the guard post may be prevented from descending. If the guard post is prevented from descending during storage, the crane car crash protector is not properly used at that stage. It is not possible to perform an operation such as pushing into the storage position, and only leave the state.

In order to improve these disadvantages, Patent Document 2 proposes that each of the guard posts provided at intervals along the longitudinal direction of the boom is moved up and down by a cylinder using a pressure fluid as a drive source. ing.
According to the configuration in which the guard post is driven by the cylinder, the vertical movement of the guard post is ensured, and particularly when a hydraulic cylinder is used, the oil chamber should be closed with the guard post fully protruding. However, the fixing operation with a positioning pin or the like is not required, but since a number of hydraulic cylinders are required, the manufacturing cost of the crane car crash protector becomes a problem.

  The techniques disclosed in Patent Document 1 and Patent Document 2 are all premised on application to a truss-structured boom, and a telescopic type in which a plurality of constituent members are superposed inside and outside, especially a boom covering an outer peripheral portion. Not suitable for the boom. The reason is that it is difficult to retract the guard post that slides in the vertical direction into the space in the boom, and even if the guard post can be retracted itself, the guard post in the retracted state can be expanded and contracted. It interferes with the structural member of a boom in the case of.

As a crash protection for crane trucks having other configurations, for example, a crash protection for crane trucks using a guard post that is swingably attached to a bracket is disclosed in Patent Document 3.
In this case, the lower end of the guard post is attached to a long hole drilled in an upside down L-shape in a bracket fixed to the upper surface of the boom via a pivot pin, and the pivot pin is attached to the corner portion of the elongated hole. The guard post can be rotated with respect to the bracket in a state of contacting with the bracket, and the pivot pin can be slid along each of the elongated holes constituted by the two straight portions of the upside down L-shaped elongated holes. In addition, a lock pin fixed to the guard post at a position slightly spaced from the pivot position of the pivot pin on the guard post is a corner portion of the above-described upside-down inverted L-shaped elongated hole. Is slidably fitted in a 1/4 arc-shaped slot on the bracket side formed in the second quadrant. Of course, upside down L-shaped long holes may be used instead of upside down L-shaped long holes. In that case, a 1/4 arc-shaped long hole on the bracket side is formed in the first quadrant. Will be.
In addition, a locking elongated hole that extends linearly toward the corner portion of the upside down L-shaped elongated hole is formed integrally with the arc portion at both ends of the 1/4 arc-shaped elongated hole on the bracket side, The total length of the locking elongated hole extending in the vertical direction and the vertical length of the inverted L-shaped elongated hole, and the total length of the locking elongated hole extending in the horizontal direction and the inverted L-shaped elongated hole The length of the horizontal direction is made equal, and the lock pin and the guard post are integrated in the direction toward the corner portion of the upside down L-shaped long hole by the coil spring connecting the bracket and the guard post. Is being energized.
In other words, when retracting the crane car crash protector, the guard post is tilted horizontally and the pivot pin on the guard post is fitted to the end of the horizontal slot in the upside-down L-shaped slot. The lock post on the guard post is fitted into the lock elongated hole extending in the horizontal direction to restrain the guard post from swinging and the state is held by the urging force of the coil spring. When using a guard, the guard post is raised vertically, and the pivot pin on the guard post is fitted to the end on the opposite corner of the vertical hole in the upside down L-shaped long hole. The lock pin on the guard post is fitted into the long hole for the lock extending in the direction to restrain the swing of the guard post, and the state is restricted by the biasing force of the coil spring. It is configured to lifting.
Then, the swinging operation of the guard post during start-up and storage is performed by manually pulling the guard post toward the tip against the elastic return force of the coil spring to remove the lock pin from the slot for locking. The pivot pin is brought into contact with the corner portion of the upside down L-shaped slot, and the pivot pin on the guard post is moved along the quarter arc slot with the pivot pin pressed against the corner portion. This is done by sliding and rotating the guard post around the pivot pin.
When such a configuration is applied, there is no need to attach a positioning pin for fixing the guard post, there is no need to worry about manufacturing costs, and there is no need to retract the guard post into the space in the boom. It can also be applied to telescopic booms in which the above components are superposed on the inside and outside, but the state of the crane car crash protector is in proper use, that is, all guard posts are not upright, or some guard posts When the operator is not standing upright, the operator must walk over the boom to start up the crane car crash protector and to swing the guard post during storage. It is unsuitable as a crash protection for crane trucks for high-altitude work targeting a boom that exceeds 2 meters.

Japanese Patent Laid-Open No. 7-69585 (FIGS. 1 and 2) Japanese Patent Laid-Open No. 7-144885 (FIGS. 1 and 2) JP-A-8-133671 (FIGS. 5, 7, and 8)

  An object of the present invention is to improve the disadvantages of the prior art, and is suitable for a truss-structured boom or a telescopic boom in which a plurality of components are superposed inside and outside, so that an operator can ride on the boom or walk on the boom. Therefore, it is an object of the present invention to provide a crash protection device for a crane vehicle that can easily start up, store, and lock the guard post without causing adverse effects such as an increase in manufacturing cost.

The crash protector for a crane vehicle according to the present invention is configured such that each of the plurality of brackets fixed at intervals along the longitudinal direction of the boom can swing within a vertical plane on which the boom swings. Is a crash protector for a crane vehicle having a plurality of guard posts fixed at the lower ends of the guard posts by pivot pins and a lifeline spanned over each guard post, and in order to achieve the above object,
In either the state where the guard post is tilted in parallel with the boom or the state where the guard post is raised perpendicularly to the boom, on one side of the straight line connecting the pivot pins arranged along the longitudinal direction of the boom In the position around the lower end of each guard post that is located, a rigging fastening part integral with the guard post is provided,
In the state where the guard posts adjacent to each other are raised vertically with respect to the boom, the rigging fastening portions of the guard posts adjacent to each other are connected by a non-stretchable rigging,
A guard post lock mechanism that is operated by an operating rod arranged along the longitudinal direction of the boom and that holds the posture of each guard post in a state where each guard post is raised vertically with respect to the boom. It has the structure characterized by this.

The rigging fixing part integrated with the guard post is arranged along the longitudinal direction of the boom in both the state where the guard post is tilted in parallel with the boom and the state where the guard post is raised vertically with respect to the boom. Located on one side of a straight line connecting the pivot pins. Therefore, a pressing force or a pulling force acting along the longitudinal direction of the boom is applied to the rigging fixing part, and the linking is performed along a part of the arc locus whose radius is the distance between the rigging fixing part and the pivot pin. By displacing the fixing part in the forward and reverse directions with respect to the longitudinal direction of the boom, the guard post is moved forward and backward in a section from a state where the guard post is tilted parallel to the boom to a state where it is raised vertically to the boom. Conversely, it can be swung.
Here, if the guard posts adjacent to each other are erected vertically with respect to the boom, the rigging fastening portion is provided on the same side of the straight line in the guard posts adjacent to each other. By swinging one guard post, the rigging fixing part on the other guard post is displaced in the same direction as the rigging fixing part on the one guard post in the direction along the longitudinal direction of the boom. By swinging one of the guard posts, the other guard post can be swung in the same direction as the one card post and brought down in a state parallel to the boom. When the guard post that is tilted in parallel with the boom is raised, the direction of swinging is reversed, but the operating principle is the same as this.
In addition, if the guard posts adjacent to each other are provided on the different sides of the straight line in the state where the adjacent guard posts are vertically raised with respect to the boom, By swinging the guard post, the rigging fastening part in the other guard post is displaced in the direction opposite to the rigging fastening part in the one guard post in the direction along the longitudinal direction of the boom. By swinging one guard post, the other guard post can be swung in a direction opposite to that of the one card post to fall in a state parallel to the boom. In this case, the adjacent guard posts swing with their upper ends approaching or separating from each other. When the guard post that is tilted in parallel with the boom is raised, the direction of swinging is reversed, but the operating principle is the same as this.
And since the rigging fixing parts of the guard posts adjacent to each other are all connected by the non-stretchable rigging, if only one guard post located on the base side of the boom is swung down, the other All of the guard posts of the boom will fall in a state parallel to the boom, and if only one guard post located on the base side of the boom is swung to a state perpendicular to the boom, all other guard posts will be boomed. It will stand up to a state perpendicular to.
By swinging one guard post located on the base side of the boom, all other guard posts can be started up or pushed down, so that operators can ride on the boom or walk on the boom. The guard post can be easily set up and stored without the need for a worker to improve worker safety.
In addition, a guard post locking mechanism that holds the posture of each guard post in a state where each guard post is raised vertically with respect to the boom is provided, and this guard post locking mechanism is disposed along the longitudinal direction of the boom. Therefore, the operator can lock the guard post in the state where it is raised by operating the operation rod with the end of the operation rod located on the base side of the boom. It can be operated and unlocked so that the guard post can be easily locked and unlocked in the raised state without the operator getting on or walking over the boom. Therefore, the safety of workers is improved.
In addition, since the guard post is configured to swing up to the stowed or retracted state, there is no need to retract the guard post from the upper surface of the boom to the lower surface side. The present invention can be easily applied to a telescopic boom in which the constituent members are superposed inside and outside.
In addition, since a plurality of cylinders using a pressure fluid as a drive source is not required, there is no adverse effect such as an increase in manufacturing cost.

Alternatively, in order to achieve the same object as described above, the guard posts are arranged along the longitudinal direction of the boom in both the state where the guard posts are tilted parallel to the boom and the state where the guard posts are raised vertically with respect to the boom. A first rigging fastening part integral with the guard post is provided at a position around the lower end of each guard post located on one side of the straight line connecting the pivot pins, while the other side of the straight line. In the peripheral position of the lower end of each guard post located in the second post rigging fastening part integral with the guard post,
In a state where the guard posts adjacent to each other are raised vertically with respect to the boom, the first rigging fastening portions and the second rigging fastening portions of the guard posts adjacent to each other, or these The first rigging fastening portion and the second rigging fastening portion in the guard posts adjacent to each other are connected by a non-stretchable rigging,
A guard post lock mechanism that is operated by an operating rod arranged along the longitudinal direction of the boom and that holds the posture of each guard post in a state where each guard post is raised vertically with respect to the boom. You may employ | adopt the structure characterized by this.

When such a configuration is applied, the first rigging fixing portion integrated with the guard post is either in a state where the guard post is tilted in parallel with the boom or in a state where the guard post is raised vertically with respect to the boom. Is also located on one side of a straight line connecting the pivot pins arranged along the longitudinal direction of the boom. Therefore, a pressing force or a pulling force acting along the longitudinal direction of the boom is applied to the first rigging fastening portion, and the arc locus having a radius of the distance between the first rigging fastening portion and the pivot pin is used. By displacing the first rigging fixing part along the part in the forward and reverse directions with respect to the longitudinal direction of the boom, the guard post is made to stand perpendicular to the boom from a state where the guard post is tilted parallel to the boom. It can be swung forward and backward in the section up to the raised state.
In addition, the second rigging fastening part integrated with the guard post is opposite to the first rigging fastening part, in a state where the guard post is tilted parallel to the boom and the guard post is perpendicular to the boom. In any of the raised states, it is located on the other side of the straight line connecting the pivot pins arranged in the longitudinal direction of the boom. Accordingly, the guard post can be moved perpendicularly to the boom from a state where the guard post is tilted in parallel with the boom by applying a tensile force or a pressing force acting along the longitudinal direction of the boom to the second rigging fixing portion. Can be swung in the forward and reverse directions during the period up to the state where it is started up. However, in order to swing the guard post in the same direction as when operating the first rigging fixing portion, the first rigging fixing portion is operated with a force acting along the longitudinal direction of the boom. It is necessary to reverse the case.
Here, if the guard posts adjacent to each other are raised vertically with respect to the boom, the first rigging fastening portions and the second rigging fastening portions of the adjacent guard posts are not connected to each other. If it is connected with a stretchable rigging, by swinging one guard post, the first and second rigging fastening parts on the other guard post are also in the direction along the longitudinal direction of the boom Since the first guard post is displaced in the same direction as the first and second rigging fixing portions, the other guard post is swung in the same direction as the one card post by swinging one guard post. It can be moved and brought down in parallel with the boom. When the guard post that is tilted in parallel with the boom is raised, the direction of swinging is reversed, but the operating principle is the same as this.
When swinging the guard post, the rigging that connects the first rigging fastening part of one guard post and the first rigging fastening part of the other guard post, and one guard post A pressing force acts on either one of the riggings connecting the second rigging fastening part of the second rigging part and the second rigging fastening part of the other guard post, Has a pulling force. Therefore, the material of the rigging does not necessarily need to be a rigid body that can transmit both the pulling force and the pressing force. As long as it is a non-stretchable rigging material such as a wire that easily bends, the material is It doesn't matter. This is because the other guard post can be swung only by the pulling force acting on the first rigging fastening portion of the other guard post or the second rigging fastening portion of the other guard post.
Further, if the guard posts adjacent to each other are raised vertically with respect to the boom, the first rigging fastening portion and the second rigging fastening portion of the adjacent guard posts are not stretchable. If one of the guard posts is swung, the first and second rigging fixing portions of the other guard post are moved in the direction along the longitudinal direction of the boom. Since one guard post is displaced in the opposite direction to the first and second rigging fixing parts, the other guard post is swung in the opposite direction to one card post by swinging one guard post. Can be brought down in parallel with the boom. In this case, the adjacent guard posts swing with their upper ends approaching or separating from each other. When the guard post that is tilted in parallel with the boom is raised, the direction of swinging is reversed, but the operating principle is the same as this.
When swinging the guard post, the rigging that connects the first rigging fastening part of one guard post and the second rigging fastening part of the other guard post, and one guard post A pressing force acts on either one of the riggings connecting the second rigging fastening part and the first rigging fastening part of the other guard post to the other rigging. Has a pulling force. Therefore, the material of the rigging is not limited as long as it is a non-stretchable rigging for the same reason as described above.
Then, the first rigging fixing portions and the second rigging fixing portions in the guard posts adjacent to each other, or the first rigging fixing portions and the second in the guard posts adjacent to each other. Since all of the rigging fasteners are connected by non-stretchable rigging, swinging only one guard post located on the base side of the boom and tilting it will cause all the other guard posts to move to the boom. It falls into a parallel state, and if only one guard post located on the base side of the boom is swung and started up in a state perpendicular to the boom, all other guard posts will also stand up in a state perpendicular to the boom. Become.
Truss structure, which makes it easy to start and store the guard post, and to lock and unlock the guard post, except that wires that easily bend can be used as the rigging Can be easily applied to a telescopic boom in which a plurality of components are superposed on the inside and outside of the boom, and there is no need for a plurality of cylinders that use pressure fluid as a drive source, eliminating the disadvantages of rising manufacturing costs The same effect as described above can be achieved.

The crash protector for a crane vehicle of the present invention can perform all other guard post start-up operations and tilt-down operations by simply swinging one guard post located on the base side of the boom, The raised guard post is locked and unlocked by operating a control rod arranged along the longitudinal direction of the boom, so that an operator does not have to ride on the boom or walk on the boom. The guard post can be raised and stored and the guard post can be locked and unlocked at the position of the base of the boom, thereby improving the safety of the operator.
In addition, since the guard post is swung up to the stowed or retracted state, it is not necessary to retract the guard post from the upper surface of the boom toward the lower surface side, and the boom of the truss structure also has a plurality of The present invention can be easily applied to a telescopic boom in which components are superposed inside and outside.
In addition, since a plurality of cylinders using pressure fluid as a driving source is not required, there is no adverse effect such as an increase in manufacturing cost.

It is the side view shown about the appearance of the crane truck of one embodiment which materialized and applied the crash protection work for crane cars of the present invention. It is the top view shown in the state where the revolving drum with which the crane truck of the embodiment is provided was removed from the body. It is the perspective view shown in the state which removed the boom support stand and boom with which the crane vehicle of the embodiment is provided from the turning trunk. It is the side view which showed the structure of the fall protection work for crane vehicles attached to the boom. It is the figure which showed the structure of the bracket fixedly provided by the edge part by the side of the base part of a main boom, FIG. 5 (a) is the top view which looked at the periphery of the bracket from upper direction, FIG.5 (b) is FIG. The side view which showed the circumference | surroundings of the bracket from the same direction, FIG.5 (c) is sectional drawing which showed the circumference | surroundings of the bracket along arrow AA of FIG.5 (b). It is the figure which showed the structure of the bracket fixedly installed in the center part of the longitudinal direction of a main boom, FIG. 6 (a) and FIG.6 (e) are the top views which looked at the periphery of the bracket seeing from upper direction, FIG. (B) is a side view showing the periphery of the bracket from the same direction as FIG. 4, FIG. 6 (c) is a cross-sectional view showing the periphery of the bracket along the arrow BB in FIG. 6 (b), FIG. (D) is sectional drawing which showed the circumference | surroundings of the bracket along arrow CC of FIG.6 (b). It is the figure which showed the structure of the bracket fixedly installed in the front-end | tip part of the main boom, FIG. 7 (a) is the top view which looked at the periphery of the bracket from upper direction, FIG.7 (b) is the same direction as FIG. 7C is a side view showing the periphery of the bracket, FIG. 7C is a front view showing the periphery of the bracket when viewed from the front end side of the main boom, and FIG. 7D is an arrow in FIG. 7B showing the periphery of the bracket. It is sectional drawing shown along view DD.

  Next, an embodiment for carrying out the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a side view showing an external appearance of a crane truck 1 according to an embodiment in which the crash protection work for a crane truck according to the present invention is embodied, and FIG. 2 is a vehicle body showing a swivel body 2 provided in the crane truck 1 of the embodiment. FIG. 3 is a perspective view showing the boom support 4 and the boom 5 provided in the crane vehicle 1 of the embodiment in a state where it is removed from the revolving barrel 2.

  The crane vehicle 1 of this embodiment includes an engine, a power transmission device, a braking device, a steering device, a traveling wheel, a driving cabin, an outrigger device used for stabilizing the posture of a suspended load, and the like required for self-propelling. The vehicle body 3 provided, the swivel drum 2 that is turnably mounted on the car body 3, the counterweight 6 that is detachably mounted on the swivel drum 2, and the work that is movably mounted on the swivel drum 2 The main part is configured by the boom support 4 fixed on the cabin 7 and the swivel drum 2 and the boom 5 attached to the boom support 4 so as to be raised and lowered.

As shown in FIG. 2, the working cabin 7 includes a swing arm 8 attached to the revolving cylinder 2 so as to be swingable in a horizontal plane on the side of the revolving cylinder 2, and the working cabin 7 within the horizontal plane. The work cabin 7 is attached to the swivel cylinder 2 via a cabin pivot pin 9 for pivotally mounting the work cabin 7 to the tip of the swing arm 8.
The swing arm 8 is configured to swing in a horizontal plane on the side of the swing cylinder 2 by the expansion and contraction operation of the hydraulic cylinder 10 pivotally attached at one end on the swing cylinder 2, and is pivotally mounted on the swing arm 8. The working cabin 7 is configured to swing in the horizontal plane on the distal end side of the swing arm 8 by the expansion and contraction of the hydraulic cylinder 11 pivotally attached to both ends of the working cabin 7 and the swing arm 8.
1 and 2, the state of the working cabin 7 when the crane vehicle 1 performs a suspended work, that is, the hydraulic cylinder 10 is completely shortened and the hydraulic cylinder 11 is fully extended to boom the working cabin 7. Although shown in a state of being positioned to the side of the support 4, the hydraulic cylinder 10 is extended with the counterweight 6 shown in FIG. 1 removed from the swivel cylinder 2, and the hydraulic cylinder 11 is shortened to swing. By swinging the arm 8 and the working cabin 7 together in the clockwise direction in FIG. 2, the storage position 7 ′ of the working cabin 7 indicated by the two-dot chain line in FIG. The working cabin 7 can be placed and fixed in an empty space on the swivel cylinder 2 after being removed.
When the crane vehicle 1 is traveling on a public road, the counterweight 6 is removed to reduce the weight of the crane vehicle 1 and the work cabin 7 is moved to an empty space on the revolving barrel 2 after the counterweight 6 is removed. By doing so, the entire width of the crane vehicle 1 is shortened, and the weight limit and the width limit of the public road are dealt with.

  The boom 5 is a four-stage telescopic boom in which a plurality of components are superposed on the inside and outside. As shown in FIG. 3, a crane car crash protector 13 is attached on the main boom 12 constituting the outermost cylinder. It has been.

  As shown in FIG. 4, the crash protector 13 for the crane vehicle of this embodiment includes a plurality of brackets 14, 15 and 16 fixed at intervals along the longitudinal direction of the main boom 12, and the swing of the boom 5. A plurality of guard posts 20, 21, 22 fixed to brackets 14, 15, 16 with pivot pins 17, 18, 19 so that the lower end thereof can swing within a moving vertical plane; A guard post locking mechanism 50 that holds the posture of each guard post 20, 21, 22 in a state in which each guard post 20, 21, 22 is raised vertically with respect to the boom 12, and the guard posts 20, 21, 22 The lifeline 23 (refer FIG. 3) hung over an upper end part is provided.

  Of the two brackets 14 and 16 located on the outermost side, one bracket 16 is fixed to the distal end portion of the main boom 12 and the other bracket 14 is fixed to the end portion on the base side of the main boom 12. Has been.

As shown in FIG. 4, holes 24, 25, and 26 for passing the lifeline 23 are drilled in the upper ends of the guard posts 20, 21, and 22 along the longitudinal direction of the main boom 12. As shown in FIG. 3, a lifeline 23 having one end fixed to a lifeline fixing part 27 provided at the foremost part of the main boom 12 is provided in these holes 26, 25, 24. Is penetrated in one direction along the longitudinal direction of the main boom 12.
The other end of the lifeline 23 passing through the hole 24 of the guard post 20 is finally fixed to a lifeline locking hook 28 fixed to the base side of the main boom 12.
The inner diameters of the holes 24, 25, 26 formed in the upper ends of the guard posts 20, 21, 22 are large enough to allow the lifeline 23 to easily slide while maintaining a loose fit state.

  FIG. 5 is a view showing the details of the portion a in FIG. 4, that is, the configuration around the bracket 14 fixed to the end portion on the base side of the main boom 12, and FIG. FIG. 5 (b) is a side view showing the periphery of the bracket 14 from the same direction as FIG. 4, and FIG. 5 (c) is a plan view showing the periphery of the bracket 14 in FIG. 5 (b). It is sectional drawing shown along arrow AA.

  FIG. 5A shows two plate-like stays 31, 31 for providing a first rigging fastening portion 29 and a second rigging fastening portion 30 at the lower end of the guard post 20. As shown in the figure, the lower end of the guard post 20 is fixedly attached to the guard post 20 so as to be sandwiched from both sides. The stays 31, 31 are integral with the guard post 20, and can be rotated integrally with the guard post 20 around a pivot pin 17 that pivots the guard post 20 to the bracket 14.

  Of the two plate-like stays 31, 31, as shown in FIG. 5 (c), a part of the stay 31 located on the side close to the main boom 12 is the longitudinal direction of the main boom 12 as shown in FIG. 4. The straight line connecting the pivot pins 17, 18, 19 aligned along the horizontal axis is the horizontal axis, and the position of the pivot pin 17 shown in FIG. As shown in FIG. 5C, the stay 31 is integrated with the stay 31 so as to be parallel to the projecting portion with a certain gap in the direction approaching the main boom 12 with respect to the projecting portion of the stay 31. A pin functioning as the first rigging fixing portion 29 is spanned between the auxiliary stay 32 fixedly installed and the above-described overhanging portion, and both ends of the pin are integrated with the stay 31 and the auxiliary stay 32. It is fixed to.

  More specifically, the pin that functions as the first rigging fixing portion 29 has a horizontal axis that is a straight line connecting the pivot pins 17, 18, and 19, and the position of the pivot pin 17 is a coordinate origin. In the first quadrant, in FIG. 5 (b), it is separated from the pivot pin 17 in the direction of 45 ° obliquely upward to the right.

  The guard post 20 attached to the bracket 14 positioned at the base side end of the main boom 12 is directed from the raised state shown in FIG. 5B toward the longitudinal center of the main boom 12, that is, 5 (b), it is configured to be swung 90 degrees toward the counter clockwise direction, so that the guard post 20 is in a retracted state in which the guard post 20 is tilted parallel to the main boom 12. The pin functioning as the first rigging fixing portion 29 is the second when the straight line connecting the pivot pins 17, 18, 19 is the horizontal axis and the position of the pivot pin 17 is the coordinate origin. It is located in the quadrant and is separated from the pivot pin 17 in the direction of 45 ° diagonally left upward in FIG. 5B.

  In other words, the pin functioning as the first rigging fixing portion 29 is used when the guard post 20 is tilted in parallel with the main boom 12 and the guard post 20 is raised vertically with respect to the main boom 12. In any state, one side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, that is, this straight line in FIGS. 4 and 5 (b). It is provided in the periphery position of the lower end part of the guard post 20 which becomes a part located above the lower part.

  As described above, the first rigging fixing portion 29 integrated with the guard post 20 raises the guard post 20 vertically with respect to the main boom 12 and with the guard post 20 tilted in parallel with the main boom 12. In any state, since it is always located on one side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, the pressing force or tension acting along the longitudinal direction of the main boom 12 A force is applied to the first rigging fixing portion 29, and the first rigging device is stopped along a part of an arc locus whose radius is the distance between the first rigging fixing portion 29 and the pivot pin 17. The guard post 20 is moved vertically from the main boom 12 in a main direction by displacing the attachment portion 29 forward and backward with respect to the longitudinal direction of the main boom 12, that is, left and right in FIG. Boom 12 and flat It can be swung forward and backward in the section up to downed state.

  Further, of the two plate-like stays 31, 31, as shown in FIG. 5C, a part of the stay 31 located on the side far from the main boom 12 is part of the main boom 12 as shown in FIG. 4. The direction of the third quadrant when the straight line connecting the pivot pins 17, 18, 19 arranged along the longitudinal direction is the horizontal axis and the position of the pivot pin 17 shown in FIG. 5B is the coordinate origin. As shown in FIG. 5C, the stay 31 is arranged so as to be parallel to the protruding portion with a certain gap in a direction away from the main boom 12 with respect to the protruding portion of the stay 31. A pin functioning as the second rigging fixing portion 30 is spanned between the auxiliary stay 33 integrally fixed to the above-described overhanging portion, and both ends of this pin are connected to the stay 31 and the auxiliary stay 33. It is fixed integrally.

  More specifically, the pin functioning as the second rigging fixing part 30 has a horizontal axis that is a straight line connecting the pivot pins 17, 18, and 19, and the position of the pivot pin 17 is the coordinate origin. In the third quadrant of the case, it is separated from the pivot pin 17 in the direction of 45 ° diagonally to the left in FIG. 5B.

  The guard post 20 attached to the bracket 14 positioned at the base side end of the main boom 12 is directed from the raised state shown in FIG. 5B toward the longitudinal center of the main boom 12, that is, 5 (b), it is configured to be swung 90 degrees toward the counter clockwise direction, so that the guard post 20 is in a retracted state in which the guard post 20 is tilted parallel to the main boom 12. The pin functioning as the second rigging fixing part 30 is the fourth when the straight line connecting the pivot pins 17, 18, 19 is the horizontal axis and the position of the pivot pin 17 is the coordinate origin. It is located in the quadrant and is separated from the pivot pin 17 in the direction of 45 ° obliquely downward to the right in FIG.

  That is, the pin functioning as the second rigging fixing part 30 is used when the guard post 20 is tilted in parallel with the main boom 12 and the guard post 20 is raised vertically with respect to the main boom 12. In any state, the other side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, that is, in FIG. 4 and FIG. The first rope is provided in the guard post 20 which is one of the two outermost guard posts 20 and 22 provided at a position around the lower end of the guard post 20 which is a portion located below the straight line. As shown in FIG. 5 (c), the pin that functions as the anchoring portion 29 and the functional pin as the second rigging anchoring portion 30 are spaced apart in the axial direction of the pivoting pin 17 and are guard posts 20. Together with Further, as shown in FIG. 5B, a second rigging fastening portion 30 is provided at a position symmetrical to the first rigging fastening portion 29 with the pivot pin 17 interposed therebetween. Will be.

  As described above, the second rigging fixing part 30 integrated with the guard post 20 is a state in which the guard post 20 is tilted in parallel with the main boom 12 and the guard post 20 is raised vertically with respect to the main boom 12. In any state, it is always located on the other side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, so that the pressing force acting along the longitudinal direction of the main boom 12 Or a second pulling force is applied to the second rigging anchoring portion 30, and the second rigging along a part of the arc locus whose radius is the distance between the second rigging anchoring portion 30 and the pivot pin 17 The guard post 20 is raised vertically with respect to the main boom 12 by displacing the fixing part 30 forward and backward with respect to the longitudinal direction of the main boom 12, that is, left and right in FIG. To main boom 12 It can be swung forward and backward in the section up to a state of being brought down in parallel.

FIG. 6 is a diagram showing the details of the portion b in FIG. 4, that is, the configuration around the bracket 15 fixed to the central portion in the longitudinal direction of the main boom 12, and among these, FIG. 6A and FIG. e) is a plan view showing the periphery of the bracket 15 from above, FIG. 6B is a side view showing the periphery of the bracket 15 from the same direction as FIG. 4, and FIG. 6B is a cross-sectional view taken along the line BB in FIG. 6B, and FIG. 6D is a cross-sectional view showing the periphery of the bracket 15 along the line CC in FIG. 6B. .
However, FIG. 6A is a diagram showing an aspect when the guard post 21 is in a locked state, and FIG. 6E is a diagram showing an aspect when the guard post 21 is in an unlocked state. The details are different.

  At the lower end of the guard post 21, there are two plate-like stays 36, 36 for providing the first rigging fastening portions 34a, 34b and the second rigging fastening portions 35a, 35b as shown in FIG. As shown in a), the guard post 21 is fixedly attached integrally with the guard post 21 so as to sandwich the lower end portion of the guard post 21 from both sides. The stays 36 and 36 are integral with the guard post 21, and can be rotated integrally with the guard post 21 around a pivot pin 18 that pivots the guard post 21 to the bracket 15.

  Of the two plate-like stays 36, 36, a part of the stay 36 located on the side far from the main boom 12 as shown in FIG. 6D is a longitudinal direction of the main boom 12 as shown in FIG. Is projected in the direction of the second quadrant when the straight line connecting the pivot pins 17, 18, 19 arranged along the horizontal axis is the horizontal axis and the position of the pivot pin 18 shown in FIG. As shown in FIG. 6D, the stay 36 is integrated with the stay 36 so as to be parallel to the projecting portion with a certain gap in a direction away from the main boom 12 with respect to the projecting portion of the stay 36. A pin that functions as the first rigging fixing portion 34 a is spanned between the auxiliary stay 37 fixedly provided and the above-described overhanging portion, and both ends of this pin are integrated with the stay 36 and the auxiliary stay 37. It is fixed to.

  Similarly, a part of the stay 36 located on the side close to the main boom 12 also has a straight line connecting the pivot pins 17, 18, 19 arranged along the longitudinal direction of the main boom 12 as shown in FIG. 4. It projects in the direction of the second quadrant when it is a horizontal axis and the position of the pivot pin 18 shown in FIG. 6B is the coordinate origin, and as shown in FIG. The auxiliary stay 38 integrally fixed to the stay 36 so as to be parallel to the projecting portion with a certain gap in the direction approaching the main boom 12 with respect to the projecting portion of the projecting portion, and the aforementioned projecting portion. A pin that functions as the first rigging fixing portion 34b is spanned between the ends, and both ends of the pin are integrally fixed to the stay 36 and the auxiliary stay 38.

  More specifically, each pin functioning as the first rigging fixing part 34a, 34b has a horizontal axis as a straight line connecting the pivot pins 17, 18, 19 and coordinates the position of the pivot pin 18 In the second quadrant in the case of the origin, it is spaced apart from the pivot pin 18 in the direction of 45 ° obliquely upward to the left in FIG. 6 (b).

  The guard post 21 attached to the bracket 15 located at the central portion in the longitudinal direction of the main boom 12 is directed from the raised state shown in FIG. 6B toward the base side of the main boom 12, that is, FIG. Since the configuration is such that the guard post 21 is swung 90 ° toward the clockwise direction in b), the guard post 21 is placed in a state parallel to the main boom 12 in the retracted state. Each pin functioning as one rigging fixing part 34a, 34b is the first when the straight line connecting the pivot pins 17, 18, 19 is a horizontal axis and the position of the pivot pin 18 is the coordinate origin. It is located in the quadrant and is separated from the pivot pin 18 in the direction of 45 ° diagonally right upward in FIG. 6B.

  That is, the pins functioning as the first rigging fixing portions 34 a and 34 b are in a state in which the guard post 21 is folded in parallel with the main boom 12 and the guard post 21 stands vertically with respect to the main boom 12. In any raised state of use, one side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, that is, in FIGS. 4 and 6B, A guard post 21 is provided at a position around the lower end of the guard post 21 which is a portion located above this straight line, and is the guard post 21 which is the other guard post excluding the two guard posts 20 and 22 located on the outermost side. As shown in FIG. 6 (d), the pin functioning as one rigging fixing part 34a and the pin functioning as the first rigging fixing part 34b are spaced apart in the axial direction of the pivoting pin 18. It will have been formed integrally with the guard post 21 in the form to be set.

  Thus, the first rigging fixing portions 34 a and 34 b integrated with the guard post 21 stand in a state where the guard post 21 is tilted in parallel with the main boom 12 and the guard post 21 stands vertically with respect to the main boom 12. In any of the raised states, it is always located on one side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, so that the pressing force acting along the longitudinal direction of the main boom 12 Or a pulling force is applied to the first rigging fixing portions 34a and 34b, and along a part of the arc locus whose radius is the distance between the first rigging fixing portions 34a and 34b and the pivot pin 18. The guard post 21 is perpendicular to the main boom 12 by displacing the first rigging fixing portions 34a and 34b forward and backward with respect to the longitudinal direction of the main boom 12, that is, left and right in FIG. Standing It can be swung forward and backward in a section from the raised state to a state of being brought down in parallel with the main boom 12.

  Further, the other part of the stay 36 located on the side far from the main boom 12 is a horizontal line that connects the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12 as shown in FIG. 4. 6 and is projected in the direction of the fourth quadrant when the position of the pivot pin 18 shown in FIG. 6B is the coordinate origin. As shown in FIG. Between the above-described overhanging portion and the auxiliary stay 39 integrally fixed to the stay 36 so as to be parallel to the overhanging portion with a certain gap in a direction away from the main boom 12 with respect to the overhanging portion. A pin functioning as the second rigging fixing portion 35 a is stretched over the both ends, and both ends of the pin are integrally fixed to the stay 36 and the auxiliary stay 39.

  Similarly, the other part of the stay 36 located on the side close to the main boom 12 also connects the pivot pins 17, 18, 19 arranged along the longitudinal direction of the main boom 12 as shown in FIG. 4. It projects in the direction of the fourth quadrant when the straight line is the horizontal axis and the position of the pivot pin 18 shown in FIG. 6B is the coordinate origin, and as shown in FIG. The auxiliary stay 40 integrally fixed to the stay 36 so as to be parallel to the protruding portion with a certain gap in the direction approaching the main boom 12 with respect to the protruding portion of the stay 36, and the above-described protruding portion. A pin that functions as the second rigging fixing portion 35b is spanned between the two and the both ends of the pin are integrally fixed to the stay 36 and the auxiliary stay 40.

  More specifically, each pin functioning as the second rigging fixing part 35a, 35b has a horizontal axis as a straight line connecting the pivot pins 17, 18, 19 and coordinates the position of the pivot pin 18 In the fourth quadrant when the origin is set, it is separated from the pivot pin 18 in the direction of 45 ° diagonally downward to the right in FIG. 6B.

  The guard post 21 attached to the bracket 15 located at the central portion in the longitudinal direction of the main boom 12 is directed from the raised state shown in FIG. 6B toward the base side of the main boom 12, that is, FIG. Since the configuration is such that the guard post 21 is swung 90 ° toward the clockwise direction in b), the guard post 21 is placed in a state parallel to the main boom 12 in the retracted state. Each of the pins functioning as the two rigging fixing portions 35a and 35b is the third when the straight line connecting the pivot pins 17, 18, and 19 is the horizontal axis, and the position of the pivot pin 18 is the coordinate origin. It is located in the quadrant and is separated from the pivot pin 18 in the direction of 45 ° diagonally to the left in FIG. 6B.

  In other words, the pins functioning as the second rigging fixing portions 35 a and 35 b are in a state in which the guard post 21 is retracted in parallel with the main boom 12 and the guard post 21 stands vertically with respect to the main boom 12. In any raised state of use, it can be said on the other side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, that is, FIG. 4 and FIG. 6 (b). For example, the guard post 21 which is provided at a position around the lower end of the guard post 21 which is a portion located below the straight line and which is other guard post except for the two guard posts 20 and 22 located on the outermost side. Each of the pin functioning as the second rigging fixing part 35a and the pin functioning as the second rigging fixing part 35b is spaced apart in the axial direction of the pivoting pin 18 as shown in FIG. The guard post 21 is configured integrally with the first post, and as shown in FIG. 6B, the first rigging fixing portions 34a and 34b are positioned symmetrically with the pivot pin 18 interposed therebetween. The second rigging fastening portions 35a and 35b are provided on the sill.

  As described above, the second rigging fastening portions 35a and 35b integrated with the guard post 21 stand in a state in which the guard post 21 is tilted in parallel with the main boom 12 and the guard post 21 stands vertically with respect to the main boom 12. In any raised state, it is always located on the other side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, so that it works along the longitudinal direction of the main boom 12. A pressing force or a pulling force is applied to the second rigging fastening portions 35a and 35b so that the distance between the second rigging fastening portions 35a and 35b and the pivot pin 18 is a part of an arc locus having a radius. Along the second rigging fastening portions 35a and 35b along the longitudinal direction of the main boom 12, the guard post 21 is moved to the main boom 12 by moving the second rigging fixing portions 35a and 35b to the main boom 12. Against It can be swung forward and backward in a section from the launched state to the state that was brought down in parallel with the main boom 12.

  FIG. 7 is a view showing the details of the portion c in FIG. 4, that is, the configuration around the bracket 16 fixed to the front end portion of the main boom 12, and FIG. 7B is a side view showing the periphery of the bracket 16 from the same direction as FIG. 4, and FIG. 7C is a view showing the periphery of the bracket 16 from the front end side of the main boom 12. FIG. 7D is a cross-sectional view showing the periphery of the bracket 16 along the arrow DD in FIG. 7B.

  At the lower end of the guard post 22, two plate-like stays 43, 43 for providing a first rigging fastening portion 41 and a second rigging fastening portion 42 are shown in FIG. As shown, the guard post 22 is fixedly attached to the guard post 22 so that the lower end of the guard post 22 is sandwiched from both sides. The stays 43, 43 are integral with the guard post 22, and can be rotated integrally with the guard post 22 around a pivot pin 19 that pivots the guard post 22 to the bracket 16.

  Of the two plate-like stays 43, 43, a part of the stay 43 located on the side closer to the main boom 12 as shown in FIG. 7D is the longitudinal direction of the main boom 12 as shown in FIG. Is projected in the direction of the second quadrant where the straight line connecting the pivot pins 17, 18, 19 arranged along the horizontal axis is the horizontal axis and the position of the pivot pin 19 shown in FIG. As shown in FIG. 7D, the stay 43 is integrated with the stay 43 so as to be parallel to the projecting portion with a certain gap in the direction approaching the main boom 12 with respect to the projecting portion of the stay 43. A pin functioning as the first rigging fixing portion 41 is spanned between the auxiliary stay 44 fixed to the projecting portion and the above-described overhanging portion, and both ends of this pin are integrated with the stay 43 and the auxiliary stay 44. It is fixed.

  More specifically, the pin functioning as the first rigging fixing portion 41 has a straight line connecting the pivot pins 17, 18, 19 as the horizontal axis, and the position of the pivot pin 19 as the coordinate origin. In the second quadrant of the case, it is spaced apart from the pivot pin 19 in the direction of 45 ° diagonally to the left in FIG. 7B.

  The guard post 22 attached to the bracket 16 positioned at the distal end of the main boom 12 is directed from the raised state shown in FIG. 7B toward the central portion in the longitudinal direction of the main boom 12, that is, FIG. ) In the storage state in which the guard post 22 is tilted in a state parallel to the main boom 12 in the storage state. The pin functioning as the rigging fixing portion 41 is located in the first quadrant where the straight line connecting the pivot pins 17, 18, 19 is the horizontal axis and the position of the pivot pin 19 is the coordinate origin. Thus, in FIG. 7B, it is in a state of being separated from the pivot pin 19 in a direction of 45 ° obliquely upward to the right.

  In other words, the pin functioning as the first rigging fixing portion 41 is used when the guard post 22 is tilted in parallel with the main boom 12 and the guard post 22 is raised vertically with respect to the main boom 12. In any state, one side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, that is, this straight line in FIGS. 4 and 7 (b). It is provided in the periphery position of the lower end part of the guard post 22 which is a part located above the bottom.

  As described above, the first rigging fastening portion 41 integrated with the guard post 22 is a state where the guard post 22 is tilted in parallel with the main boom 12 and the guard post 22 is raised vertically with respect to the main boom 12. In any state, since it is always located on one side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, the pressing force or tension acting along the longitudinal direction of the main boom 12 A force is applied to the first rigging fixing portion 41, and the first rigging device is stopped along a part of an arc trajectory having a radius of the distance between the first rigging fixing portion 41 and the pivot pin 19 as a radius. The guard post 22 is lifted vertically with respect to the main boom 12 by displacing the landing portion 41 forward and backward with respect to the longitudinal direction of the main boom 12, that is, left and right in FIG. With the main boom 12 It can be swung forward and backward in the section up to a state of being brought down in the row.

  Further, of the two plate-like stays 43, 43, a part of the stay 43 located on the side far from the main boom 12 as shown in FIG. 7 (d) is part of the main boom 12 as shown in FIG. The direction of the fourth quadrant when the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction is the horizontal axis, and the position of the pivot pin 19 shown in FIG. As shown in FIG. 7D, the stay 43 and the stay 43 are parallel to the projecting portion with a certain gap in the direction away from the main boom 12 with respect to the projecting portion of the stay 43. A pin that functions as the second rigging fixing portion 42 is spanned between the auxiliary stay 45 that is integrally fixed and the above-described overhanging portion, and both ends of this pin are integrated with the stay 43 and the auxiliary stay 45. Fixed.

  More specifically, the pin that functions as the second rigging fixing portion 42 has a straight line connecting the pivot pins 17, 18, and 19 as a horizontal axis, and the position of the pivot pin 19 as a coordinate origin. In the fourth quadrant of the case, it is separated from the pivot pin 19 in the direction of 45 ° obliquely downward to the right in FIG.

  The guard post 22 attached to the bracket 16 positioned at the distal end of the main boom 12 is directed from the raised state shown in FIG. 7B toward the central portion in the longitudinal direction of the main boom 12, that is, FIG. ) In the storage state of the guard post 22 in which the guard post 22 is tilted in parallel with the main boom 12. The pin functioning as the rigging fixing portion 42 is located in the third quadrant where the straight line connecting the pivot pins 17, 18 and 19 is the horizontal axis and the position of the pivot pin 19 is the coordinate origin. Thus, in FIG. 7 (b), it is in a state of being separated from the pivot pin 19 in a 45 ° direction diagonally to the left.

  In other words, the pin functioning as the second rigging fixing part 42 is used when the guard post 22 is tilted in parallel with the main boom 12 and the guard post 22 is raised vertically with respect to the main boom 12. In any state, the other side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, that is, in FIG. 4 and FIG. The first rope is provided on the guard post 22 which is one of the two outermost guard posts 20 and 22 provided at the peripheral position of the lower end portion of the guard post 22 which is a portion located below the straight line. As shown in FIG. 7 (d), the pin that functions as the tool fastening part 41 and the function pin as the second cord fastening part 42 are spaced apart in the axial direction of the pivoting pin 19 and are guard posts 22. Together with Further, as shown in FIG. 7B, a second rigging fastening portion 42 is provided at a position symmetrical to the first rigging fastening portion 41 with the pivot pin 19 interposed therebetween. Will be.

  As described above, the second rigging fixing portion 42 integrated with the guard post 22 raises the guard post 22 vertically with respect to the main boom 12 while the guard post 22 is tilted in parallel with the main boom 12. In any state, it is always located on the other side of the straight line connecting the pivot pins 17, 18, 19 aligned along the longitudinal direction of the main boom 12, so that the pressing force acting along the longitudinal direction of the main boom 12 A second pulling force is applied to the second rigging fastening portion 42 and a second rope along a part of an arc locus whose radius is the distance between the second rigging fastening portion 42 and the pivot pin 19. The guard post 22 is raised vertically with respect to the main boom 12 by displacing the fixture fastening portion 42 forward and backward with respect to the longitudinal direction of the main boom 12, that is, left and right in FIG. To main boom 12 It can be swung forward and backward in the section up to a state of being brought down in parallel.

  Then, as shown in FIG. 4, in a state where a pair of guard posts 20 and 21 adjacent to each other is raised vertically with respect to the main boom 12, the first rigging fixing portion 29 in the guard post 20 is provided. And the second rigging anchoring portion 35b of the guard post 21 are connected to each other without looseness by a non-stretchable rigging cord such as a metal wire 46, and further the second rigging anchoring portion of the guard post 20 30 and the first rigging fastening part 34a of the guard post 21 are connected to each other with a non-stretchable rigging rope, for example, a metal wire 47, without slack. Hereinafter, a connection state in which the rigging intersects in this way is referred to as a state in which the first rigging fastening portion and the second rigging fastening portion in the guard posts adjacent to each other are connected by the rigging. As shown in FIG. 4, the rigging 46 and the rigging 47 intersect when viewed from the side, but as shown in FIGS. 5 (c) and 6 (d), the first rigging in the guard post 20. The second rigging fastening portion 35b in the fastening portion 29 and the guard post 21, that is, the connection destination of the rigging 46 is relatively close to the main boom 12, and the second rope in the guard post 20 is also connected. Since the connecting portion of the first rigging fixing portion 34a of the rigging portion 30 and the guard post 21, that is, the rigging device 47 is relatively far from the main boom 12, the rigging device 46 and the rigging device 47 are connected to each other. There is no contact.

  Further, as shown in FIG. 4, the first rigging fastening portion 34 b and the guard post in the guard post 21 in a state where the guard posts 21 and 22 adjacent to each other are raised vertically with respect to the main boom 12. 22 is connected without slack by a non-stretchable rigging cord, for example, a metal wire 48, and the second rigging fastening portion 35a on the guard post 21 and the guard. The second rigging fastening portion 42 in the post 22 is connected without a slack with a rigging 49 made of a non-stretchable rigging, such as a metal wire. Hereinafter, the connection state in which the rigging is parallel in this way, the state where the first rigging fastening portions and the second rigging fastening portions in the guard posts adjacent to each other are connected by the rigging, Called. 6 (d) and 7 (d), the first rigging fastening part 34b of the guard post 21 and the first rigging fastening part 41 of the guard post 22, that is, the rigging 48 The connection destination is relatively close to the main boom 12, and the second rigging fastening portion 35 a of the guard post 21 and the second rigging fastening portion 42 of the guard post 22, that is, the rigging 49 Since the connection destination of the cable is relatively away from the main boom 12, the rigging 48 and the rigging 49 are both parallel to the side surface of the main boom 12 and are also parallel to each other. The tool 48 and the rigging 49 do not contact.

In this embodiment, regarding the connection relationship between the guard posts 20 and 21 that are adjacent to each other, the first rigging fastening portion and the second rigging fastening portion of the guard posts 20 and 21 that are adjacent to each other are used. Since the state in which the rigging is connected (see paragraph 0061) is applied, one guard post 20 is swung in the counterclockwise direction in FIG. The first and second rigging fastening portions 34 a and 35 b in the other guard post 21 are fastened to the first and second rigging fastenings in the one guard post 20 in the direction along the longitudinal direction of the main boom 12. The other guard post 21 swings in the direction of the clockwise in FIG. 6B and falls in a state parallel to the main boom 12.
Further, regarding the connection relationship between the guard posts 21 and 22 that are adjacent to each other, the first rigging fastening portions and the second rigging fastening portions of the guard posts 21 and 22 that are adjacent to each other are routed. Since the state connected with the tool (see paragraph 0062) is applied, if one guard post 21 is swung in the clockwise direction in FIG. The first and second rigging fastening portions 41 and 42 in the other guard post 22 are also in the direction along the longitudinal direction of the main boom 12, and the first and second rigging fastening portions 34 b in the one guard post 21. , 35a, and the other guard post 22 swings in the clockwise direction in FIG. 7B and falls in a state parallel to the main boom 12.
And the 1st rigging fastening part and the 2nd rigging fastening part in the guard posts 20 and 21 adjacent to each other, and the 1st rigging fastening part in the guard posts 21 and 22 adjacent to each other Since the two and the second rigging fastening parts are all connected by rigging, if only one guard post 20 located on the base side of the main boom 12 is swung and tilted, for example, FIG. As shown by the two-dot chain line, all the other guard posts 21 and 22 also fall in a state parallel to the main boom 12, and only one guard post 20 located on the base side of the main boom 12 is swung. When the main boom 12 is started up in a vertical state, all the other guard posts 21 and 22 are also up in a state vertical to the main boom 12.
As the rigging tools 46, 47, 48, and 49, a metal wire that easily bends is used. Therefore, the force when the guard post 21 is tilted is the first cord on the guard post 21 in FIG. The force when the guard post 22 is tilted is given by the pulling force of the rope 47 pulling the tool fastening part 34a to the right, and the first rope fastening part 41 in the guard post 22 in FIG. Will be given by the pulling force of the rigging 48 that pulls to the right. Further, the force for raising the guard post 21 is given by the pulling force of the rigging 46 that pulls the second rigging fastening portion 35b of the guard post 21 to the right in FIG. The force when starting up 22 is given by the pulling force of the rope 49 that pulls the second rigging fastening portion 42 of the guard post 22 toward the right in FIG. 7B.

Here, as an example, the first rigging fastening portion and the second rigging fastening portion of the guard posts 20 and 21 adjacent to each other are connected by the rigging (see paragraph 0061), and the mutual Although it has described the configuration in which the first rigging fastening portions and the second rigging fastening portions in the guard posts 21 and 22 adjacent to each other are connected with the rigging (see paragraph 0062), In the guard posts 21 and 22 adjacent to each other, the first rigging fastening portions and the second rigging fastening portions in the guard posts 20 and 21 adjacent to each other are connected to each other by the rigging. You may employ | adopt the structure made into the state which connected the 1st rigging fastening part and the 2nd rigging fastening part with the rigging.
When such a configuration is employed, the guard post 21 is moved in the counterclockwise direction in FIG. 7, that is, in the same direction as the guard post 20 by swinging and tilting the guard post 20 located on the base side of the main boom 12. The guard post 22 falls in the clockwise direction in FIG. 7 as described above.
The guard post 22 located at the front end of the main boom 12 and the guard post 20 located at the end on the base side of the main boom 12 are both swung toward the center in the longitudinal direction of the main boom 12 to be tilted. Is that the guard posts 20 and 22 are raised at the extreme end on the base side of the main boom 12 and the most distal end of the main boom 12, that is, the lifeline 23 can be stretched over the full span of the main boom 12. Even if the guard posts 20 and 22 are tilted and stored in a state where the brackets 14 and 16 are disposed at the extreme end on the base side of the main boom 12 and the most distal end of the main boom 12, the guard posts 20 and 22 The purpose is to prevent the main boom 12 from projecting outward beyond the entire length of the main boom 12, so that a number of guard booms between the guard posts 20 and 22 If it would be a guard post, those of the swing direction is not a problem.

  Next, the configuration of the guard post lock mechanism 50 that holds the posture of each guard post 20, 21, 22 in a state where the guard posts 20, 21, 22 are raised vertically with respect to the main boom 12 will be described.

  As shown in FIG. 6 (e), one side of the main boom 12 side of the bracket 15 fixed to the central portion in the longitudinal direction of the main boom 12 was raised vertically to the main boom 12. A cam case 53 for holding a cam plate 52 to which an engaging member 51 constituted by a taper pin for preventing inadvertent swinging of the guard post 21 is fixed integrally with the bracket 15.

As shown in FIG. 6B, the left and right end portions of the cam case 53 are bent at a substantially right angle downward, and the left and right sides of the cam plate 52 are in sliding contact with the inside of the bent portion. The moving direction is restricted to the direction in which the side of the main boom 12 is contacted or separated, that is, the direction perpendicular to the paper surface in FIG.
The cam plate 52 is provided with a long hole 55 that extends in the longitudinal direction of the main boom 12 while being obliquely crossed with respect to the side surface of the main boom 12.

Then, at the center of the left and right bent portions of the cam case 53, a rod material arranged so as to extend at least from the base-side bracket 14 to the distal-end bracket 16 along the longitudinal direction of the main boom 12. Holes for passing the operation rods 54 are formed, and the operation rods 54 are attached so as to be movable in the axial direction through the holes.
A columnar engagement piece 56 that slidably contacts with the long hole 55 in the cam plate 52 is integrally fixed to the operation rod 54 by caulking or the like.

  FIG. 6E shows a state in which the operation post 54 is pulled to the limit position on the base side of the main boom 12 to put the guard post 21 in the unlocked state.

  In this state, the engagement piece 56 fixed to the operating rod 54 contacts the right end portion of the elongated hole 55 in the cam plate 52, and the engagement member 51 is configured by the cam plate 52 and the taper pin fixed to the cam plate 52. However, it is moving in a direction approaching the main boom 12.

  When the operating rod 54 is moved toward the distal end side of the main boom 12, that is, the left side in FIG. 6E from this state, the columnar engagement piece 56 moves toward the distal end side of the main boom 12 together with the operating rod 54. When the engagement piece 56 slidably in contact with the inside of the elongated hole 55 presses the cam plate 52, the engagement member 51 constituted by the cam plate 52 and the taper pin fixed to the cam plate 52 is attached to the bracket 15. Move in the direction of approach.

On the other hand, the tongue piece 57 that is integrally fixed to the lower end portion of the guard post 21 is located at a position where it can be engaged with the engaging member 51 in a state where the guard post 21 is raised, that is, the guard post 21. An engaging portion 58 formed of a hole drilled at a position around the lower end of the cam plate 52 is provided, and the engaging member 51 of the cam plate 52 that moves toward the bracket 15 enters the engaging portion 58, thereby Inadvertent swinging of the guard post 21 in a state where it is raised vertically with respect to the boom 12 is prevented.
FIG. 6A shows a state in which the engaging member 51 constituted by the taper pin completely enters the engaging portion 58 formed of a hole.

  As shown in FIGS. 6A and 6C, support plates 59 and 60 are fixed on the bracket 15 so as to sandwich the front and back of the tongue piece 57 of the guard post 21 from the taper pin. Since the engaging member 51 is inserted into the engaging portion 58 of the tongue piece 57 in such a manner as to penetrate the holes formed in the support plates 59 and 60, the engaging member 51 is raised vertically. When an external force in the direction of swinging the guard post 21 is applied, the external force is received by the tongue piece 57 and the support plates 59 and 60 fixed to the lower end of the guard post 21. Only the engaging member 51 formed of a taper pin that penetrates the three plates together and the bracket 15 to which the support plates 59 and 60 are fixed, and the external force is transmitted to the cam plate 52 and the operating rod 54. Absent.

As shown in FIGS. 7A to 7D, the bracket 16 fixed to the distal end portion of the main boom 12 also has a cam case 63 corresponding to the cam case 53 and the support plates 59 and 60 described above. Support plates 69 and 70 are fixedly attached to the lower end of the guard post 22 pivotally attached to the bracket 16, and a tongue piece 67 corresponding to the tongue piece 57 and the engaging portion 58 of the guard post 21 An engaging portion 68 (hole) is provided.
The cam case 63 fixed to the bracket 16 is internally fitted with a cam plate 62 corresponding to the aforementioned cam plate 52, and the cam plate 62 is provided with a long hole 65 corresponding to the aforementioned long hole 55. In addition, an engagement member 61 (taper pin) corresponding to the above-described engagement member 51 is fixed, and a columnar engagement piece 66 fixed to the operation rod 54 by caulking or the like is the length of the cam plate 62. The engagement member 51, the cam plate 52, the cam case 53, the elongated hole 55, the engagement piece 56, the tongue piece 57, the engagement portion 58, and the support described above are engaged with the hole 65. Since it is exactly the same as the plate 59 and the support plate 60, only the corresponding reference numerals are shown in FIGS.

  On the other hand, the bracket 14 fixed to the end portion on the base side of the main boom 12 has functions corresponding to the support plates 59 and 60 and the support plates 69 and 70 described above, as shown in FIG. The support plates 71 and 72 are fixed, and the operation rod support 64 having a shape corresponding to the cam case 53 and the cam case 63 is fixed, and is provided at the center of the left and right bent portions of the operation rod support 64. The operating rod 54 is supported by the drilled holes so as to be movable in the axial direction.

  As shown in FIG. 5B, a tongue piece 73 having a shape corresponding to the tongue piece 57 in the guard post 21 is provided at the lower end portion of the guard post 20. A hole 75 for penetrating the lock key 74 as shown in FIG.

  5 (a) and 5 (b) show a state in which the operating rod 54 is pushed toward the distal end side of the main boom 12 to the limit position and the guard posts 21, 22 are locked.

  In this state, the position of the hole 77 in the lock piece 76 fixedly attached to the operating rod 54 by caulking or the like corresponds to the position of the hole 75 in the tongue piece 73 in the guard post 20 in the raised state, and the tongue piece. The holes 73 (not shown) of the support plates 71 and 72 provided on the bracket 14 are aligned with each other so that 73 is sandwiched from the front and back.

  That is, the guard post 20 in the raised state is careless by the lock key 74 inserted through both the hole 75 of the tongue piece 73 and the holes of the support plates 71 and 72 fixed to the lower end portion thereof. Unlike the case of the guard posts 21 and 22 described above, the structure does not prevent the rocking by using the concave / convex fitting interlocked with the pushing / pulling operation of the operation rod 54.

  Then, the tip of the lock key 74 inserted through the hole 75 of the tongue piece 73 and the holes of the support plates 71 and 72 is further inserted into the hole 77 of the lock piece 76, so that an operation rod integrated with the lock piece 76 is obtained. 54 is prevented from moving in the axial direction.

  As shown in FIGS. 5 (a) and 5 (b), a locking operation piece 78 for pushing and pulling the operation rod 54 in the axial direction is fixed to the end of the operation rod 54 on the base side. Therefore, the push-pull operation of the operation rod 54 is easy.

  In the guard post locking mechanism 50 of this embodiment, the cam plates 52 and 62 fitted with the engaging pieces 56 and 66 that move together with the operating rod 54 by moving the operating rod 54 in the axial direction are connected to the guard posts 21 and 62. 22 are moved toward and away from the tongue pieces 57 and 67, and the tips of the taper pin-like engaging members 51 and 61 fixed to the cam plates 52 and 62 are engaged with the engaging portions 58 and 67 formed by the holes of the tongue pieces 57 and 67, respectively. 68, the guard posts 21 and 22 that are in a state of being vertically raised with respect to the main boom 12 can be locked and unlocked with a single touch. it can.

  Here, the start-up operation and the storage operation of the crane car crash protective work 13 will be briefly described.

  However, the guard posts 20, 21, and 22 are stored at positions indicated by two-dot chain lines in FIG. 4, and the tip of the lifeline 23 is already attached to the lifeline fixing part 27, and the other end of the lifeline 23 is Is passed through the holes 26, 25, 24 at the tips of the guard posts 22, 21, 20 and is hooked to the lifeline locking hook 28 without slack, and the operating rod 54 is pulled to the limit position on the base side of the main boom 12. It is assumed that the lock key 74 has been removed.

  As is apparent from FIG. 3, the length of the lifeline 23 between the lifeline anchoring portion 27 and the lifeline locking hook 28 required when the guard posts 20, 21, and 22 are raised is naturally guarded. Since the length of the lifeline 23 between the lifeline anchoring portion 27 and the lifeline locking hook 28 required when the posts 20, 21, 22 are stored is longer, the other end of the lifeline 23 is connected to the lifeline locking hook 28. The guard posts 20, 21, and 22 cannot be raised if they are hooked on.

  Therefore, when starting up the guard posts 20, 21, and 22, it is necessary to first remove the other end of the lifeline 23 hooked on the lifeline locking hook 28 from the lifeline locking hook 28.

  Next, when the guard post 20 located on the base side of the main boom 12 is swung in the clockwise direction around the pivot pin 14 from the retracted position shown by the two-dot chain line in FIG. For the reason, the guard posts 21 and 22 swing around the pivot pins 18 and 19 in the counterclockwise direction, and the guard posts 20, 21 and 22 rise all at once.

  At this time, the adjacent guard posts 20 and 21 swing in a direction in which their tips are separated from each other, and the distance between the holes 24 and 25 of the guard posts 20 and 21 varies greatly. Since the holes 24, 25, 26 formed in the upper ends of the posts 20, 21, 22 are penetrated in a loosely fitted state, it is possible to easily slide with respect to the holes 24, 25, 26, and the lifeline 23 Thus, the starting operation of the guard posts 20, 21, 22 is not hindered.

  Next, when it is confirmed that the guard posts 20, 21, and 22 have risen in a state perpendicular to the main boom 12, the operator holds the operation piece 78 for locking and operates the operation lever 54 of the guard post locking mechanism 50. Is pushed toward the front end side of the main boom 12.

  Then, the taper pin-like engaging members 51 and 61 provided on the cam plates 52 and 62 pressed by the engaging pieces 56 and 66 fixed to the operating rod 54 are unlocked as shown in FIG. The engagement of the guard posts 21 and 22 in which the tips of the engaging members 51 and 61 are formed by the holes of the tongue pieces 57 and 67 are moved from the position of the state to the locked state as shown in FIG. The positions of the guard posts 21 and 22 in the state of being vertically raised are locked by entering the portions 58 and 68 all at once.

  When the lock key 74 is inserted into the hole 75 formed in the tongue piece 73 of the guard post 20 and the holes of the support plates 71 and 72 as shown in FIG. The posture of the guard post 20 in a locked state is locked, and the movement of the operating rod 54 in the axial direction is also prevented by inserting the tip of the lock key 74 into the hole 77 of the locking piece 76 integral with the operating rod 54. .

  Finally, the other end of the lifeline 23 penetrating through the holes 26, 25, and 24 formed in the upper ends of the guard posts 22, 21, and 20 in a loosely fitted state is hooked to the lifeline locking hook 28 without loosening. By doing so, an appropriate tension is applied to the lifeline 23 stretched around the guard posts 22, 21, and 20, and the start-up work of the crane vehicle crash protection work 13 is completed.

  Then, the operator attaches the D-ring or carabiner attached to the worn harness to the lifeline 23, adjusts the main winding wire or auxiliary winding wire at the tip of the main boom 12, or attaches / detaches the jib or other attachment. For this reason, it moves up on the main boom 12 and moves.

  On the other hand, when the guard posts 20, 21 and 22 are tilted to store the crane car crash protector 13, first, the lifeline 23 hung on the lifeline locking hook 28 is removed from the lifeline locking hook 28 and locked. The lock key 74 is pulled out from the hole 77 of the piece 76, the hole 75 of the guard post 20, and the holes of the support plates 71 and 72, so that the axial movement of the operating rod 54 and the swing of the guard post 20 are allowed. .

  Next, when the operation rod 54 of the guard post lock mechanism 50 is pulled toward the base side of the main boom 12 with the lock operation piece 78, the cam that is in sliding contact with the engagement pieces 56 and 66 fixed to the operation rod 54 is obtained. The taper pin-shaped engaging members 51 and 61 fixed to the plates 52 and 62 are moved from the locked position as shown in FIG. 6A to the unlocked position as shown in FIG. 6E. Then, the positions of the guard posts 21 and 22 in a state where the tips of the guard posts 21 and 22 are lifted up at the same time from the engaging portions 58 and 68 of the guard posts 21 and 22 formed by the holes of the tongue pieces 57 and 67 at the same time. The lock is released.

  Next, when the guard post 20 located on the base side of the main boom 12 is swung in the counterclockwise direction around the pivot pin 14 from the rising position shown by the solid line in FIG. For the reason, the guard posts 21 and 22 swing around the pivot pins 18 and 19 in the clockwise direction and fall into the storage position indicated by a two-dot chain line in FIG.

  As already described, the lifeline 23 penetrates the holes 24, 25, 26 drilled in the upper ends of the guard posts 20, 21, 22 in a loosely fitted state. , 22 is not obstructed.

  Finally, the other end of the lifeline 23 penetrating through the holes 26, 25, and 24 formed in the upper ends of the guard posts 22, 21, and 20 in a loosely fitted state is hooked to the lifeline locking hook 28 without loosening. Thus, the lifeline 23 is stored so as not to obstruct the operation of lifting the main boom 12 or hanging work.

  As described above, in the crane vehicle crash protection work 13 of this embodiment, all the other guard posts 21, by swinging one guard post 20 located on the base side of the main boom 12, 22 can be started up and tilted down, and the operation lever 54 of the guard post lock mechanism 50 is simply moved in the axial direction with the locking operation piece 78 positioned on the base side of the main boom 12. Thus, since the guard posts 21 and 22 in the raised state can be locked and unlocked, the operator does not have to ride on the main boom 12 or walk on the main boom 12. In addition, it is possible to easily carry out all work related to the start-up and storage of the guard posts 20, 21, 22 and the safety of the worker is improved.

  In addition, since the guard posts 20, 21, and 22 are configured to swing up to be in a raised state or a retracted state, the guard posts 20, 21, and 22 are retracted from the upper surface of the main boom 12 toward the lower surface side. It is not necessary at all, and can be easily applied to a truss-structured boom and a telescopic boom in which a plurality of components are superposed inside and outside.

  In addition, since a cylinder using a pressure fluid as a drive source is not required, there is no adverse effect such as an increase in manufacturing cost.

Further, in this embodiment, in particular, the bracket is fixed to the distal end portion of the main boom 12 and the proximal end portion of the main boom 12 among the two outermost brackets, and the distal end portion of the main boom 12 is fixed. The guard post 22 of the bracket 16 positioned and the guard post 20 of the bracket 14 positioned at the base end of the main boom 12 are both swung toward the longitudinal center of the main boom 12 and stored. Therefore, the guard post 22 does not protrude beyond the tip position of the main boom 12 or the guard post 20 protrudes beyond the end position on the base side of the main boom 12 to the rear side of the main boom 12. The guard posts 22 and 20 are set upright at the extreme positions of the main boom 12 and the end of the main boom 12 on the base side. Possible it is.
Therefore, a lifeline 23 having a constant height corresponding to the height of the guard posts 20, 21, and 22 can be stretched over the full span of the main boom 12, thereby further improving worker safety.
Since the guard post 22 does not protrude from the tip of the main boom 12 or the guard post 20 protrudes from the rear of the main boom 12 even when the guard posts 20, 21, 22 are in the retracted state, the main boom There is no possibility that the guard posts 20, 21, and 22 will be in the way when twelve undulations or normal lifting work is performed.

Furthermore, holes 24, 25, 26 for passing the lifeline 23 are provided at the upper ends of the guard posts 20, 21, 22, and the lifelines 23, one end of which is secured to the forefront of the main boom 12, The plurality of guard posts 20, 21, and 22 swing in various directions because they pass through the holes 26, 25, and 24 and pass through the main boom 12 in one direction along the longitudinal direction of the main boom 12. Thus, even when the separation distance between the upper end portions of the adjacent guard posts 20 and 21 changes, the stretched lifeline 23 interferes with the holes 24 and 25 of the guard posts 20 and 21 and the guard posts 20 , 21 is not inconvenienced, and when the start-up work of the guard posts 20, 21, 22 is completed, the worker is also responsible for the work of tightening the lifeline 23 again. Since it becomes possible to readily implemented without or wade over the main boom 12 or riding over arm 12, is further improved safety of the workers.
Moreover, since the lifeline 23 can be tightly stretched even when the guard posts 20, 21, and 22 are stored in a folded position, the inconvenience that the slack of the lifeline 23 during storage is obstructed.

  Further, the first rigging fastening part 29 and the second rigging fastening part 30 in one guard post 20 of the two outermost guard posts 20 and 22 are arranged in the axial direction of the pivot pin 17. The first rigging fastening part 41 and the second rigging fastening part 42 of the other guard post 22 are spaced apart in the axial direction of the pivot pin 19. The first rigging fastening portions 34a and 34b and the second rigging fastening on the other guard posts 21 excluding the two guard posts 20 and 22 located on the outermost side. Each of the portions 35a and 35b is formed integrally with the guard post 21 so as to be separated from each other in the axial direction of the pivot pin 18 and all the rigging pieces 46, 47, 48 and 49 are not in contact with each other. Each rigging fixing part 29, 30, 34a, 3 in the state b, 35a, 35b, 41, 42 are connected to each other, so there is no mutual contact between the rigging devices 46, 47, 48, 49, and the rigging devices 46, 47, 48, 49 have friction, wear, and kinking. Therefore, the undulation work of the guard posts 20, 21, 22 can be stably performed over a long period of time.

Here, as an example, a guard post lock is provided in which a locking operation piece 78 is fixed to the end of the operation rod 54 on the base side, and the operation rod 54 is manually pushed and pulled in the axial direction by holding the locking operation piece 78. Although the structure of the mechanism 50 has been described, the engagement member 51, the cam plate 52, the cam case 53, the elongated hole 55, the engagement piece 56, the peripheral structure of the guard post 21 described above is also provided around the lower end of the guard post 20. The same members as the tongue piece 57, the engaging portion 58, the support plate 59, and the support plate 60 are provided, and the guard posts 20, 21, and 22 are moved by directly moving the operation rod 54 by actuators such as various air cylinders and solenoids. The lock operation and the unlock operation may be performed simultaneously.
In that case, it is possible to perform locking and unlocking operations of the guard posts 20, 21, and 22 that are in the raised state simply by operating the actuator switch in the work cabin 7.
In this case, manual operation of the operating rod 54 is not necessary, and therefore, unlike the locking operation piece 78 in the case of manual operation, the mounting position of the actuator for moving the operating rod 54 directly is on the base side of the main boom 12. The actuator for moving the operation rod 54 directly may be installed anywhere on the main boom 12.

  Note that a considerable force is required to move the rigging 46, 47, 48, 49 in the longitudinal direction of the main boom 12 without using the lever action by manual operation of the guard post 20, but the rigging 46, If a direct acting actuator with a large output for pushing or pulling any one of 47, 48, 49 or a rotary actuator with a large output for rotating any of the stays 31, 36, 43 is used, the above-mentioned guard is used. In addition to the locking and unlocking operations of the posts 20, 21, and 22, the guard posts 20, 21, and 22 can be raised and stored by operating the actuator switch from the work cabin 7. Is possible.

  Further, in this embodiment, the rigging of the guard posts 21 and 22 is performed only by the pulling force acting on the rigging because the rigging made of a metal wire or the like that is not stretchable but easily bends is used. Since it is necessary to realize the operation, for each guard post 21, 22, two riggings and first and second rigging fastening parts, that is, rigging 46 for raising the guard post 21 and the first rigging 2 rigging fastening portions 35b and the guard post 21 and the first rigging fastening portion 34a and the rigging 49 and the second rigging for raising the guard post 22. Although the rigging 48 and the first rigging anchoring portion 41 are required to bring down the anchoring portion 42 and the guard post 22, the rod is non-stretchable and does not easily bend or buckle as the rigging. When using a rigid body such as wood, Since the swinging operation of the guard posts 21, 22 can be realized using both the pulling force and the pressing force acting on the implement, at least one rigging fixing portion provided on the guard posts 20, 21, 22 is provided. That is, either the first rigging fastening portion or the second rigging fastening portion is provided as the rigging fastening portion, and the guard posts 20, 21, 22 are raised vertically with respect to the boom. In this state, the rigging fixing portions of the guard posts 20 and 21 and the guard posts 21 and 22 adjacent to each other may be connected to each other with a rigid rigging.

For example, in a state where a pair of guard posts 20, 21 adjacent to each other is raised vertically with respect to the main boom 12, the first rigging fixing portion 29 in the guard post 20 is used as a 1 for the guard post 20. Only one rigging fastening portion is used, and the second rigging fastening portion 35b of the guard post 21 is used as only one rigging fastening portion for the guard post 21, and these are rigging 46 such as a metal wire. In the state where the guard posts 21 and 22 adjacent to each other are raised vertically with respect to the main boom 12, the second rigging fastening portion 35 a in the guard post 21 is connected with a rigging body made of a rigid body instead of the rigging body. (35b is also acceptable) is only one rigging fastening portion for the guard post 21, and the second rigging fastening portion 42 in the guard post 22 is only one rigging fastening for the guard post 22. As the wearing part, this By connecting a ra rigging consisting of a rigid body in place of rigging 49 of metal wire or the like, it is possible to start-up and storing an operation similar to shown in FIG.
Alternatively, in a state where a pair of guard posts 20 and 21 adjacent to each other is raised vertically with respect to the main boom 12, the second rigging fastening portion 30 in the guard post 20 is used for the guard post 20. Only one rigging fastening portion is used, and the first rigging fastening portion 34a of the guard post 21 is used as only one rigging fastening portion for the guard post 21, and these are rigging tools 47 such as metal wires. In the state where the guard posts 21 and 22 that are adjacent to each other are raised vertically with respect to the main boom 12, the first rigging fixing part 34 b in the guard post 21 is connected with the rigging made of a rigid body instead of the rigging. (Also possible with 34a) is a single rigging stop for the guard post 21, and the first rigging stop 41 on the guard post 22 is the only rigging stop for the guard post 22. As the wearing part, Even when the these connected by rigging consisting of a rigid body in place of rigging 48 of metal wire or the like, it is possible to start-up and storing an operation similar to shown in FIG.

In this way, either the first rigging fastening portion or the second rigging fastening portion is provided as the rigging fastening portion, and the guard posts 20, 21, 22 adjacent to each other are attached to the boom. When the configuration in which the rigging fastening portions of the guard posts 20 and 21 and the guard posts 21 and 22 adjacent to each other are connected by a rigid rigging in the state of being vertically raised is Since the posture of the guard posts 20, 21, and 22 can be maintained by fixing any one of the following riggings, for example, a rigid rigging and rigging instead of the rigging 46. A guard for maintaining the posture of the guard posts 20, 21, and 22, or a rigid rigging in place of the rigging 47 and a rigid rigging in place of the rigging 48 itself. As a post-lock mechanism It is possible to use.
In that case, the main rig 12 arranged on the most base side, that is, a rigid rigging in place of the rigging 46 such as a metal wire or a rigid rigging in place of the rigging 47 such as a metal wire is further main. The boom 12 is used as an operation rod for operating the guard post lock mechanism by extending toward the base side of the boom 12, and the detachable pin or the like for fixing the operation rod to the main boom 12 is used as described above. A guard post locking mechanism comprising a rigid rigging in place of the rigging 46 and a rigid rigging in place of the rigging 49 or a guard comprising a rigid rigging in place of the rigging 47 and a rigid rigging in place of the rigging 48. It is added as one of the components of the post-lock mechanism.
Of course, the guard post locking mechanism 50 having the same configuration as that of the above-described embodiment may be provided independently without using the rigid rope itself as the guard post locking mechanism.

A part or all of the embodiment disclosed above can be appropriately expressed by the description shown in the following supplementary notes, but the form for carrying out the invention and the technical idea of the invention are not limited to these. Absent.
For example, between the first rigging fastening portion 29 of the guard post 20 and the second rigging fastening portion 42 of the guard post 22 and between the second rigging fastening portion 30 and the guard of the guard post 20. The first rigging fixing portion 41 of the post 22 is connected with the rigging device, and the first rigging fixing portion 41 provided on the first rigging fixing portion 41 of the guard post 22 is connected. Another second rigging provided between the portion (not shown) and the first rigging fixing portion 34a of the guard post 21 and the second rigging fixing portion 42 of the guard post 22 The guard posts 20, 21, and 22 can also be connected in the same direction as the above-described embodiment by connecting a fastening portion (not shown) and the second rigging fastening portion 35 b of the guard post 21 with a rigging. It is possible to interlock the rocking motion of the.
However, when connecting the rigging fastening parts, if you jump over the adjacent guard posts and connect to the rigging fastening parts of other guard posts, in order to synchronize the swing of all guard posts There arises a disadvantage that the total length of the required rigging is significantly redundant.
Even if it is a non-stretchable rigging, its elongation is not completely free, so if the entire length of the rigging is inadvertently redundant, the amount of swaying of the card post 21 that is swayed last for its elongation Since there is a high possibility that the card post 21 will not be properly locked due to the concave / convex fitting between the engaging member 51 and the engaging portion 58, the guards that skip adjacent guard posts and are not adjacent to each other are increased. A configuration in which the rigging fastening portion is connected between the posts, that is, a configuration in which the rigging is overlapped or doubled in the same route is not desirable.

[Appendix 1]
A plurality of brackets fixed at intervals along the length of the boom are fixed to each of a plurality of brackets by a pivot pin so that the lower end of the bracket can swing within a vertical plane where the boom swings. A crash protector for a crane vehicle comprising a plurality of guard posts and a lifeline spanned over each guard post,
In either the state where the guard post is tilted in parallel with the boom or the state where the guard post is raised perpendicularly to the boom, on one side of the straight line connecting the pivot pins arranged along the longitudinal direction of the boom In the position around the lower end of each guard post that is located, a rigging fastening part integral with the guard post is provided,
In the state where the guard posts adjacent to each other are raised vertically with respect to the boom, the rigging fastening portions of the guard posts adjacent to each other are connected by a non-stretchable rigging,
A guard post lock mechanism that is operated by an operating rod arranged along the longitudinal direction of the boom and that holds the posture of each guard post in a state where each guard post is raised vertically with respect to the boom. A crash protector for crane trucks.

[Appendix 2]
One of the two outermost brackets among the plurality of brackets is fixed to the tip of the boom and the other bracket is fixed to the base side end of the boom,
At least between a pair of guard posts adjacent to each other, the rigging fixing portions of the guard posts adjacent to each other are positioned on different sides across the straight line, thereby being positioned at the tip of the boom. The crane according to appendix 1, wherein both the guard post of the bracket and the guard post of the bracket located at the end on the base side of the boom are configured to swing toward the center in the longitudinal direction of the boom. Car crash protector.

[Appendix 3]
The guard post lock mechanism is configured by a detachable pin for fixing any one of the rigging and the rigging to the boom, and the operating rod is the most of the rigging of the boom. The rigging pin located on the base side is formed by a portion extending toward the base side of the boom, and the detachable pin fixes the operating rod portion of the rigging located on the base side of the boom to the boom. The fall protection work for crane vehicles according to supplementary note 1 or supplementary note 2, characterized by being configured as follows.

[Appendix 4]
A plurality of brackets fixed at intervals along the length of the boom are fixed to each of a plurality of brackets by a pivot pin so that the lower end of the bracket can swing within a vertical plane where the boom swings. A crash protector for a crane vehicle comprising a plurality of guard posts and a lifeline spanned over each guard post,
In either the state where the guard post is tilted in parallel with the boom or the state where the guard post is raised perpendicularly to the boom, on one side of the straight line connecting the pivot pins arranged along the longitudinal direction of the boom A first rigging fastening part integral with the guard post is provided at a position around the lower end of each guard post that is positioned, and at a position around the lower end of each guard post located on the other side of the straight line. Comprises a second rigging fastening part integral with the guard post,
In a state where the guard posts adjacent to each other are raised vertically with respect to the boom, the first rigging fastening portions and the second rigging fastening portions of the guard posts adjacent to each other, or these The first rigging fastening portion and the second rigging fastening portion in the guard posts adjacent to each other are connected by a non-stretchable rigging,
A guard post lock mechanism that is operated by an operating rod arranged along the longitudinal direction of the boom and that holds the posture of each guard post in a state where each guard post is raised vertically with respect to the boom. A crash protector for crane trucks.

[Appendix 5]
One of the two outermost brackets among the plurality of brackets is fixed to the tip of the boom and the other bracket is fixed to the base side end of the boom,
At least between a pair of guard posts adjacent to each other, the first rigging fastening portion and the second rigging fastening portion of the mutually adjacent guard posts are the non-stretchable rigging. By connecting, the guard post of the bracket located at the tip of the boom and the guard post of the bracket located at the end of the base of the boom are both configured to swing toward the center in the longitudinal direction of the boom. The crash protection for crane trucks according to appendix 4, characterized in that

[Appendix 6]
The guard post locking mechanism is fitted to an engaging portion provided integrally with the guard post at a position around the lower end of each guard post in a state where each guard post is vertically raised with respect to the boom. A plurality of engaging members that prevent the guard posts from swinging, and the plurality of engaging members are engaged with and disengaged from the engaging portions of the respective guard posts simultaneously by the movement of the operating rod in the axial direction. The crash guard for a crane vehicle according to appendix 4 or appendix 5, characterized in that it is configured as follows.

[Appendix 7]
Holes for passing lifelines are provided at the upper end of each guard post, and lifelines fixed at one end to the foremost end of the boom play these holes in one direction along the longitudinal direction of the boom. The crash protector for a crane vehicle according to any one of Supplementary Note 1, Supplementary Note 2, Supplementary Note 3, Supplementary Note 4, Supplementary Note 5 or Supplementary Note 6, which is penetrated in a fitted state.

[Appendix 8]
While the first rigging fastening part and the second rigging fastening part in the two outermost guard posts are configured integrally with the guard post, spaced apart in the axial direction of the pivot pin,
The first rigging fastening part and the second rigging fastening part in the other guard posts other than the two guard posts located on the outermost side are provided apart from each other in the axial direction of the pivoting pin. It is configured integrally with the guard post in the form,
The crane according to any one of Supplementary Note 4, Supplementary Note 5 and Supplementary Note 6, wherein all of the respective rigging elements are connected to the respective rigging fastening portions in a non-contact state with each other. Car crash protector.

DESCRIPTION OF SYMBOLS 1 Crane vehicle 2 Rotating trunk 3 Car body 4 Boom support stand 5 Boom 6 Counterweight 7 Work cabin 8 Swing arm 9 Cabin pivot pin 10, 11 Hydraulic cylinder 12 Main boom 13 Crash truck fall protection 14, 15, 16 Bracket 17, 18, 19 Pivoting pin 20, 21, 22 Guard post 23 Lifeline 24, 25, 26 Hole 27 Lifeline fixing part 28 Lifeline locking hook 29 First rigging fixing part (pin)
30 Second rigging fixing part (pin)
31 Stay 32, 33 Sub stay 34a, 34b First rigging fixing part (pin)
35a, 35b Second rigging fixing part (pin)
36 Stay 37, 38, 39, 40 Sub stay 41 First rigging fixing part (pin)
42 Second rigging fixing part (pin)
43 stay 44, 45 sub stay 46, 47, 48, 49 rigging 50 guard post lock mechanism 51 engagement member (taper pin)
52 Cam plate 53 Cam case 54 Operation rod 55 Slot 56 Engagement piece 57 Tongue piece 58 Engagement part (hole)
59, 60 Support plate 61 Engagement member (taper pin)
62 Cam plate 63 Cam case 64 Operation rod support body 65 Long hole 66 Engagement piece 67 Tongue piece 68 Engagement part (hole)
69, 70, 71, 72 Support plate 73 Tongue piece 74 Lock key 75 Hole 76 Lock piece 77 Hole 78 Locking operation piece

Claims (2)

A plurality of brackets fixed at intervals along the length of the boom are fixed to each of a plurality of brackets by a pivot pin so that the lower end of the bracket can swing within a vertical plane where the boom swings. A crash protector for a crane vehicle comprising a plurality of guard posts and a lifeline spanned over each guard post,
In either the state where the guard post is tilted in parallel with the boom or the state where the guard post is raised perpendicularly to the boom, on one side of the straight line connecting the pivot pins arranged along the longitudinal direction of the boom In the position around the lower end of each guard post that is located, a rigging fastening part integral with the guard post is provided,
In the state where the guard posts adjacent to each other are raised vertically with respect to the boom, the rigging fastening portions of the guard posts adjacent to each other are connected by a non-stretchable rigging,
A guard post lock mechanism that is operated by an operating rod arranged along the longitudinal direction of the boom and that holds the posture of each guard post in a state where each guard post is raised vertically with respect to the boom. A crash protector for crane trucks. A plurality of brackets fixed at intervals along the length of the boom are fixed to each of a plurality of brackets by a pivot pin so that the lower end of the bracket can swing within a vertical plane where the boom swings. A crash protector for a crane vehicle comprising a plurality of guard posts and a lifeline spanned over each guard post,
In either the state where the guard post is tilted in parallel with the boom or the state where the guard post is raised perpendicularly to the boom, on one side of the straight line connecting the pivot pins arranged along the longitudinal direction of the boom A first rigging fastening part integral with the guard post is provided at a position around the lower end of each guard post that is positioned, and at a position around the lower end of each guard post located on the other side of the straight line. Comprises a second rigging fastening part integral with the guard post,
In a state where the guard posts adjacent to each other are raised vertically with respect to the boom, the first rigging fastening portions and the second rigging fastening portions of the guard posts adjacent to each other, or these The first rigging fastening portion and the second rigging fastening portion in the guard posts adjacent to each other are connected by a non-stretchable rigging,
A guard post lock mechanism that is operated by an operating rod arranged along the longitudinal direction of the boom and that holds the posture of each guard post in a state where each guard post is raised vertically with respect to the boom. A crash protector for crane trucks.

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