JP4317069B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator, for example, and particularly to a construction machine provided with an operation pedal device that is stepped on the front side of a driver's seat.

  In general, a construction machine such as a hydraulic excavator is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an earth and sand that can be raised and lowered on the front side of the upper revolving body. And a work device for performing excavation work such as the above.

  In addition to the standard working equipment, for example, a manual external hydraulic device operated by an operator such as a hand breaker (rock drill), tamper (consolidator), etc. A hydraulic excavator that can be driven by pressure oil from a pump is known (see, for example, Patent Document 1).

JP-A-8-123571

  In this conventional hydraulic excavator, an operation pedal device having a pedal that is stepped on by an operator is provided on the front side of the driver's seat in order to control supply and discharge of pressure oil to and from a manual external hydraulic device. The operation pedal device stops the supply and discharge of the pressure oil from the hydraulic pump to the external hydraulic device when no operation is performed on the pedal, and supplies and discharges the pressure oil from the hydraulic pump to the external hydraulic device when the pedal is operated. It has a configuration.

  For this reason, the hydraulic excavator according to the prior art described above rotates forward and backward with respect to the floor plate in order to prevent the operator from inadvertently operating the operation pedal device when the external hydraulic device is not used. By doing so, the pedal of the operation pedal device is covered from above, and a lock member is provided for holding the pedal in a locked state (a state where the pedal cannot be operated).

  On the other hand, manual external hydraulic equipment is usually provided with an operation switch operated by an operator, and the operator who holds the external hydraulic equipment operates and stops the external hydraulic equipment by operating this operation switch. It is the structure which can control.

  Therefore, for example, when an operator who performs excavation work using a hydraulic excavator descends from the excavator during excavation work and crushes hard rocks buried in the ground using a hand breaker, In order to continue supplying pressure oil from the mounted hydraulic pump to the hand breaker, it is necessary to keep the pedal of the operating pedal device in an operating state without depending on the stepping operation of the operator.

  For this reason, in the above-described prior art, a groove portion is provided in the lock member that covers the pedal of the operation pedal device from above, and the groove portion of the lock member engages with a part of the pedal in the operated state, thereby allowing the operator to step on the foot. It is the structure which can hold | maintain the pedal of an operation pedal apparatus in an operation state using a lock member, without operating.

  However, in the above-described prior art, when a groove portion is provided in the lock member that is rotationally displaced with respect to the floor plate, and the operated pedal is covered from above by the lock member, the groove portion of the lock member is in an operated state. By being engaged with a part, the pedal is held in an operating state.

  For this reason, the work of securely engaging the groove portion of the lock member rotated with respect to the floor plate with a part of the pedal in the operation state is complicated, and the shape of the lock member including the groove portion and the shape of the pedal There is a problem that is limited. Further, when the assembly accuracy of the operation pedal device (pedal) or the lock member is poor, there is a problem that it is impossible to reliably engage a part of the pedal in the operation state with the groove portion of the lock member.

  The present invention has been made in view of the above-described problems of the prior art, and uses a lock member that moves between a lock position that prohibits the operation of the operation pedal device and a lock release position that allows the operation of the operation pedal device. An object of the present invention is to provide a construction machine capable of reliably holding the pedal in an operating state.

  In order to solve the above-described problems, the present invention provides a self-propelled vehicle body provided with a work device, a driver seat provided on a floor plate of the vehicle body, and a pedal provided on the front side of the driver seat and operated by a stepping operation. An operation pedal device, a pedal lock device that moves between a lock position that prohibits the operation of the pedal, a lock release position that allows the operation of the pedal, and a pedal holding position that engages and holds the pedal in an operating state It is applied to a construction machine comprising

  According to a first aspect of the present invention, the pedal lock device includes a lock member that can contact the upper surface of the pedal, and a hinge that rotates the lock member between the lock position and the unlock position with respect to the floor board. And a slide mechanism that is provided between the hinge mechanism and the lock member and slides the lock member along the hinge mechanism and moves it to the pedal holding position.

  According to a second aspect of the present invention, the hinge mechanism includes a fixing member fixed to the floor plate and a rotating member attached to the fixing member so as to be rotatable about an axis. A slide member that is attached and extends along the rotation member of the hinge mechanism, a long groove that is provided on one of the slide member and the rotation member and extends along the rotation member, and a slide member that rotates along the long groove. That is, it is constituted by a fastening member that fastens the moving member.

  According to a third aspect of the present invention, the lock member includes a pair of vertical frame portions that are fixed to both ends of the slide member using a bar member, and a horizontal frame portion that connects the pair of vertical frame portions and extends along the slide member. The lock frame has a pair of vertical frame portions in contact with the upper surface of the pedal in the locked position, and one vertical frame portion in contact with the upper surface of the pedal in the pedal holding position. And the other vertical frame portion is in contact with the side surface or the lower surface of the pedal.

  According to the first aspect of the present invention, when the lock member is rotated to the locked position by the hinge mechanism, an inadvertent stepping operation on the pedal can be prohibited by the lock member, and the lock member is rotated to the unlocked position. When this is done, a stepping operation on the pedal can be performed. On the other hand, when the lock member is moved to the pedal holding position by the slide mechanism, the lock member can be held in the operating state by being engaged with the pedal. In this case, since the lock member moves to the pedal holding position by sliding along the hinge mechanism, the lock member can be easily engaged with the pedal in the operated state. The pedal can be securely held in the operating state.

  According to invention of Claim 2, a fastening member is inserted in the long groove provided in any one among the rotation member of a hinge mechanism, and the slide member of a slide mechanism, and a rotation member and a slide member are fastened by this fastening member. Therefore, by loosening the fastening member, the slide member can be easily slid along the rotating member, and the lock member attached to the slide member can be easily moved to the pedal holding position. In addition, since the rotation member of the hinge mechanism and the slide member of the slide mechanism are fastened using the fastening member, the lock member attached to the slide member can be adjusted by adjusting the attachment position of the slide member with respect to the hinge mechanism. Position adjustment with the pedal can be easily performed, and the lock member can be reliably engaged with the pedal in the operated state.

  According to the invention of claim 3, the lock member is formed as a lock frame having a pair of vertical frame portions and horizontal frame portions, and one vertical frame portion abuts the upper surface of the pedal at the pedal holding position and the other vertical frame portion. Since the frame portion is in contact with the side surface or the lower surface of the pedal, the pedal can be reliably held in the operation state by sandwiching the pedal in the operation state between the pair of vertical plate portions.

  Hereinafter, a case where an embodiment of the construction machine according to the present invention is applied to a hydraulic excavator will be described as an example, and will be described in detail with reference to FIGS. 1 to 15.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine applied to the present embodiment. The hydraulic excavator 1 is capable of a self-propelled crawler-type lower traveling body 2 and can turn on the lower traveling body 2. The upper revolving body 3 that is mounted and constitutes the vehicle body together with the lower traveling body 2 and the work device 4 that is provided on the front side of the upper revolving body 3 so as to be able to move up and down and perform excavation work of earth and sand, etc. Has been.

  Here, the upper swing body 3 is a weight balance between the swing frame 5 serving as a base, a driver seat 10 described later disposed on the swing frame 5, and the work device 4 provided on the rear end side of the swing frame 5. And a counterweight 6 and an engine, a hydraulic pump, etc. (none of them are shown) provided on the front side of the counterweight 6.

  The working device 4 includes a swing post 4A provided at the front end portion of the swing frame 5 so as to be swingable in the left and right directions, a boom 4B provided on the swing post 4A so as to be able to be lifted and lowered, and the boom 4B. The arm 4C is provided on the tip side of the arm 4C so as to be able to move up and down, and the bucket 4D is provided on the tip side of the arm 4C so as to be rotatable.

  A boom cylinder 4E is provided between the swing post 4A and the boom 4B, an arm cylinder 4F is provided between the boom 4B and the arm 4C, and a bucket cylinder 4G is provided between the arm 4C and the bucket 4D. Is provided. Further, as shown in FIG. 2, a swing cylinder 4H that swings the swing post 4A left and right is provided between the swing frame 5 and the swing post 4A.

  Reference numeral 7 denotes a hand breaker (rock drill) as an external hydraulic device. The hand breaker 7 is used to crush the bedrock or the like when there is a hard bedrock or the like in the ground during excavation work, for example. is there. Here, a vibration device (not shown) including a tube and a piston or the like inserted into the tube is provided inside the hand breaker 7, and is manually operated by an operator outside the hand breaker 7. An operation switch 7A is provided. The hand breaker 7 operates the operation switch 7A in a state where pressure oil for operation is supplied from a hydraulic pump (not shown) of the hydraulic excavator 1 through a hydraulic hose 8 or the like by operation of an operation pedal device 14 described later. By doing so, the piston of the vibration exciter continuously reciprocates in the tube to generate vibration, and rocking operation is performed by this vibration.

  Reference numeral 9 denotes a floor plate provided on the revolving frame 5, and the floor plate 9 is formed of a flat plate made of, for example, a metal material and extends in the horizontal direction. The upper surface of the floor plate 9 is covered with a floor mat (not shown) made of a rubber material or the like.

  Reference numeral 10 denotes a driver's seat provided on the floor plate 9, which is seated by an operator who operates the excavator 1. The upper part of the driver's seat 10 is covered with a canopy 11.

  Reference numeral 12 denotes an operation lever device (only the left side is shown) arranged on both the left and right sides of the driver's seat 10, and an operator seated on the driver's seat 10 operates the operation lever device 12 to turn the upper swing body 3; The excavation operation of earth and sand by the working device 4 can be controlled.

  Reference numerals 13 and 13 denote left and right traveling pedal / lever devices located on the front side of the driver's seat 10 and disposed in the center of the front portion of the floor board 9. These left and right traveling pedal / lever devices 13 are arranged in the driver's seat. 10 is controlled by a stepping operation or a manual operation by an operator who is seated on the lower traveling body 2.

  14 is an operation pedal device for an external hydraulic device, which is located on the front side of the driver's seat 10 and is provided on the left side of the front portion of the floor plate 9. The operation pedal device 14 is described later, as shown in FIGS. It is configured as a hydraulic operation pedal device including a pilot valve 15 and a pedal 18 and is stepped on by an operator seated on the driver's seat 10.

  15 is a pressure reducing valve type pilot valve attached to the floor plate 9. The pilot valve 15 includes a casing 15A, a lid 15B provided on the upper side of the casing 15A, and the lid as shown in FIG. A pedal attachment plate 15C provided on the body 15B so as to be swingable in the left and right directions; and a left and right pusher 15D provided between the pedal attachment plate 15C and the casing 15A so as to be movable in the upward and downward directions. 15E.

  Here, as shown in FIGS. 4 and 5, the pilot valve 15 is secured to the support bracket 16 provided on the lower surface side of the floor plate 9 with bolts 17 at both left and right ends of the lid 15 </ b> B. By doing so, it is attached to the lower surface side of the floor board 9.

  The pilot valve 15 is operated so that a pedal 18 (described later) tilts leftward and rightward, and one pusher 15D is pushed to supply and discharge pressure oil to the hand breaker 7. A hydraulic pilot signal is output to (not shown). Thereby, according to the operation state with respect to the pedal 18, the pressure oil for an operation | movement is supplied / discharged toward the hand breaker 7 from a hydraulic pump (not shown).

  Reference numeral 18 denotes a pedal that constitutes the operation pedal device 14 together with the pilot valve 15. The pedal 18 tilts to the left and right by being stepped on by the operator, and transmits the operating force at this time to the pilot valve 15. It is. And the pedal 18 is comprised by the bracket 19 mentioned later and the tread board 22, as shown in FIG.5 and FIG.7.

  Reference numeral 19 denotes a bracket attached to the pilot valve 15. The bracket 19 is formed in a rectangular plate shape that extends in the left and right directions as a whole using, for example, a steel plate material or the like, and extends in the length direction (left and right directions). The flat plate portion 19A is located at the center, and the left and right tread plate mounting portions 19B and 19B are located on both sides in the length direction across the flat plate portion 19A and rise upward from the flat plate portion 19A. Further, left and right bolt insertion holes 19C and 19C are drilled in the flat plate portion 19A of the bracket 19, and bolt insertion holes 19D are drilled in the left and right tread plate mounting portions 19B and 19B of the bracket 19, respectively. Has been.

  Between the flat plate portion 19A of the bracket 19 and the pedal mounting plate 15C of the pilot valve 15, left and right sleeves 20 and 20 extending in the upward and downward directions are disposed, and the bolt insertion hole 19C and the sleeve of the bracket 19 are disposed. The bracket 19 is attached to the pilot valve 15 via the left and right sleeves 20 by screwing a long bolt 21 inserted into the pedal 20 into the pedal attachment plate 15C of the pilot valve 15.

  Reference numeral 22 denotes a tread board mounted on the bracket 19, and the tread board 22 is formed in a rectangular plate shape that extends in the left and right directions as a whole by using a non-slipable resin material such as rubber. The tread 22 is located at the center of the length direction (left and right) and the flat plate 22A, and is located on both sides of the length across the flat plate 22A and rises obliquely upward from the flat plate 22A. The left and right rising portions 22B and 22B are generally configured, and the upper surface 22C of the tread plate 22 is stepped on by an operator, and a lock frame 25 (to be described later) is in contact with the left and right side surfaces 22D of the tread plate 22. .

  Here, insert nuts 22E are embedded in the left and right rising portions 22B of the tread plate 22, respectively, and the bolts 23 inserted through the bolt insertion holes 19D of the bracket 19 are screwed into the insert nuts 22E of the tread plate 22. The tread plate 22 is mounted on the tread plate mounting portion 19B of the bracket 19.

  Reference numeral 24 denotes a pedal lock device provided in the vicinity of the operation pedal device 14. The pedal lock device 24 includes a lock frame 25, a hinge mechanism 26, a slide mechanism 29, and the like which will be described later.

  Reference numeral 25 denotes a lock frame that is rotatably supported on the floor plate 9 by using a hinge mechanism 26 to be described later. As shown in FIG. 8 and the like, the lock frame 25 is, for example, a single bar such as a round steel material. By bending, a pair of left and right vertical frame portions 25A and 25A fixed to a slide plate 30 described later is connected to the left and right vertical frame portions 25A and 25A along the slide plate 30. And a horizontal frame portion 25B extending in the left and right directions.

  A hinge mechanism 26 is located on the front side of the pedal 18 and is provided on the upper surface side of the floor board 9. The hinge mechanism 26 rotates the lock frame 25 between a lock position and a lock release position described later. is there. Here, as shown in FIGS. 4, 8, and 9, the hinge mechanism 26 is a fixing plate as a fixing member fixed to the support bracket 27 bent in an L-shaped cross section by means of welding or the like. 26A, and a rotating plate 26C as a rotating member attached to the fixed plate 26A so as to be rotatable forward and backward about a shaft 26B.

  The support bracket 27 to which the fixing plate 26A is fixed is fixed to the upper surface side of the floor plate 9 using bolts 28. Further, two male screws 26D and 26D are provided on the upper surface side of the rotating plate 26C so as to be spaced apart in the left and right directions, and the left and right male screws 26D are long grooves of a slide plate 30 described later. It is inserted through the hole 30A.

  A slide mechanism 29 is provided between the lock frame 25 and the hinge mechanism 26. The slide mechanism 29 slides the lock frame 25 along the rotation plate 26C of the hinge mechanism 26 to a pedal holding position described later. And move it. Here, as shown in FIGS. 4, 8, and 9, the slide mechanism 29 includes each male screw 26 </ b> D of the hinge mechanism 26, a slide plate 30, a long slot 30 </ b> A, a nut 31, and the like described later.

  Reference numeral 30 denotes a slide plate as a slide member, and the slide plate 30 is formed in a rectangular plate shape extending in the left and right directions along the rotating plate 26C of the hinge mechanism 26. The left and right vertical frame portions 25A constituting the lock frame 25 are fixed to both left and right ends of the slide plate 30 by means such as welding.

  30A and 30A are left and right slotted holes formed in the slide plate 30. These left and right slotted holes 30A are equally spaced from the left and right male screws 26D protruding from the rotating plate 26C of the hinge mechanism 26. And extends left and right along the rotating plate 26C. The left and right elongated slots 30A are inserted through the left and right male screws 26D protruding from the rotating plate 26C of the hinge mechanism 26.

  Reference numerals 31 and 31 denote nuts that are screwed into the male screws 26D of the hinge mechanism 26. These nuts 31 are screwed into the male screws 26D that are inserted into the long slot holes 30A of the slide plate 30, thereby The rotating plate 26C is fastened. That is, each male screw 26 </ b> D and each nut 31 of the hinge mechanism 26 constitute a fastening member that fastens the rotating plate 26 </ b> C and the slide plate 30 of the hinge mechanism 26 via the long slot 30 </ b> A of the slide plate 30. In addition, the outer peripheral side of each nut 31 is knurled so that the nut 31 can be manually tightened without using a tool such as a spanner.

  In this way, the lock frame 25 of the pedal lock device 24 is attached to the rotating plate 26C of the hinge mechanism 26 via the slide plate 30 of the slide mechanism 29, and the floor plate 9 is centered on the shaft 26B of the hinge mechanism 26. A structure that rotates forward and backward (in the direction of arrow A in FIG. 4) and slides left and right (in the direction of arrow B in FIG. 3) within the range of the slot 30A provided in the slide plate 30. It has become.

  Then, the lock frame 25 of the pedal lock device 24 rotates forward and rearward with respect to the floor plate 9 about the shaft 26B of the hinge mechanism 26, so that the pedal 18 of the pedal 18 is moved as shown in FIGS. As shown in FIGS. 10 and 11, the locking position extends upward and extends in the horizontal direction, and as shown in FIGS.

  Here, when the lock frame 25 is displaced to the lock position, each vertical frame portion 25A of the lock frame 25 abuts on the upper surface 22C of the tread plate 22, and the horizontal frame portion 25B of the lock frame 25 moves left and right along the tread plate 22. Extending in the direction. Therefore, as shown by a two-dot chain line in FIGS. 3 and 4, when the operator's foot F comes into contact with the lateral frame portion 25 </ b> B of the lock frame 25, the stepping operation on the pedal 18 can be prohibited, and The lock frame 25 can be used as a footrest.

  On the other hand, when the lock frame 25 is displaced to the unlocked position, the entire lock frame 25 is largely separated in front of the pedal 18, so that the operator's foot F is as shown by the two-dot chain line in FIGS. The tread plate 22 of the pedal 18 can be stepped on without being obstructed by the lock frame 25, and the operation pedal device 14 (pilot valve 15) can be operated by tilting the pedal 18 leftward and rightward. ing.

  Further, the lock frame 25 of the pedal lock device 24 slides left and right in the range of the long slot 30A formed in the slide plate 30 with respect to the rotating plate 26C of the hinge mechanism 26, whereby FIG. As shown in FIG. 4, the pedal 18 is engaged with the tilted pedal 18 and moved to a pedal holding position that holds the pedal 18 in the operating state (tilted state).

  Here, when the lock frame 25 is displaced to the pedal holding position, as shown in FIG. 15 and the like, the one vertical frame portion 25A of the lock frame 25 is moved to the upper surface of the pedal 18 (the upper surface 22C of the tread plate 22). ) And the other vertical frame portion 25A of the lock frame 25 abuts on the side surface of the pedal 18 that has been tilted (the side surface 22D of the tread plate 22), and the pair of vertical frame portions 25A enter an operation state. By sandwiching the pedal 18, the pedal 18 is held in the operating state (tilted state). Thus, even if the operator does not perform a stepping operation, the operation pedal device 14 (pilot valve 15) can be kept in a continuous operation state using the lock frame 25, and a hand breaker can be operated from a hydraulic pump (not shown). The pressure oil for operation can be continuously supplied to and discharged from 7.

  Reference numeral 32 denotes another operation pedal device provided on the front right side of the floor plate 9 and positioned on the front side of the driver's seat 10. The operation pedal device 32 is similar to the above-described operation pedal device 14 and includes the pilot valve 15 and the pedal. It is configured as a hydraulic operating pedal device composed of 18 grades.

  The operation pedal device 32 outputs a hydraulic pilot signal to a switching valve (not shown) that supplies and discharges pressure oil to and from the swing cylinder 4H, for example, by a stepping operation by an operator seated in the driver's seat 10, The swing post 4A is swung left and right in accordance with the expansion and contraction operation of the cylinder 4H.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described below.

  First, when performing excavation work of earth and sand using the working device 4 of the excavator 1, the operator sits on the driver's seat 10 and operates the traveling pedal / lever device 13, so that the excavator 1 is installed on the work site. To self-run. Then, when the operator operates the operation lever device 12 at the work site, the work device 4 can be moved up and down while turning the upper swing body 3, and the work device 4 can be used for excavating earth and sand. .

  Here, when the hydraulic excavator 1 is in operation, the operation pedal device 14 that supplies and discharges pressure oil to and from the hand breaker 7 as an external hydraulic device is in an operation prohibited state in which the operation of the pedal 18 is prohibited, and the operation of the pedal 18. The operation permission state in which the pedal 18 is permitted and the operation holding state in which the pedal 18 is held in the operation state take one of the three modes. Hereinafter, the three modes of the operation pedal device 14 will be described. Is described.

  First, since the hand breaker 7 is not used at the time of excavation work using the work device 4, the operation pedal device 14 is in an operation prohibited state in which the operation of the pedal 18 is prohibited. It is necessary to prevent the stepping operation.

  In this case, the lock frame 25 of the pedal lock device 24 is moved to the lock position protruding above the pedal 18 as shown in FIGS. Thus, each vertical frame portion 25A of the lock frame 25 abuts on the upper surface 22C of the tread plate 22, and the horizontal frame portion 25B of the lock frame 25 extends in the left and right directions along the tread plate 22. For this reason, as shown by a two-dot chain line in FIGS. 3 and 4, when the operator's foot F comes into contact with the horizontal frame portion 25B of the lock frame 25, the stepping operation on the pedal 18 is prohibited and the operation is inadvertently performed. Operation of the pedal device 14 (pilot valve 15) can be reliably prohibited. At this time, the lock frame 25 can be used as an operator's footrest.

  Next, for example, when the excavation work by the work device 4 is interrupted and an operator other than the operator seated in the driver's seat 10 uses the hand breaker 7 to crush a hard bedrock buried in the ground, the hand breaker 7 In order to supply and discharge the pressure oil, the operation pedal device 14 needs to be in an operation-permitted state so that the operator can step on the pedal 18.

  In this case, the lock frame 25 in the lock position is rotated upward about the shaft 26B of the hinge mechanism 26 and moved to the lock release position shown in FIGS. As a result, the lock frame 25 extends upward and downward at a position far away from the front of the pedal 18, so that the operator can step on the pedal 18 without being blocked by the lock frame 25. The pedal 18 can be tilted leftward and rightward (see FIG. 15).

  As a result, one pusher 15D of the pilot valve 15 is pushed, and a hydraulic pilot signal is output to a switching valve (not shown) for supplying and discharging pressure oil to the hand breaker 7, whereby a hydraulic pump (not shown). ) To the hand breaker 7 is discharged and discharged. In this state, when the operator holding the hand breaker 7 operates the operation switch 7A, the piston of the vibration device provided in the hand breaker 7 continuously reciprocates in the tube to generate vibration. The hand breaker 7 can be used to perform crushing work such as a bedrock.

  Next, for example, when excavation work by the work device 4 is interrupted and the operator who is seated in the driver's seat 10 uses the hand breaker 7 to crush the hard bedrock buried in the ground, he relies on the operator's stepping operation. Therefore, the operation pedal device 14 needs to be in the operation holding state in order to hold the pedal 18 in the operation state.

  In this case, the nut 31 is screwed into each male screw 26D of the hinge mechanism 26 in a state where the lock frame 25 of the pedal lock device 24 is rotated to the unlock position about the shaft 26B of the hinge mechanism 26. By loosening, the fastening state of the rotating plate 26C and the slide plate 30 is loosened. Then, after sliding the slide plate 30 left and right within the range of the long slot 30A with respect to the rotating plate 26C of the hinge mechanism 26, the lock frame 25 is moved toward the pedal 18 with the shaft 26B of the hinge mechanism 26 as the center. By rotating, the lock frame 25 is moved to the pedal holding position shown in FIGS.

  As a result, one vertical frame portion 25A of the lock frame 25 abuts on the upper surface of the pedal 18 that has been tilted (the upper surface 22C of the tread plate 22), and the other vertical frame portion 25A acts on the side surface of the pedal 18 (the tread plate 22). The pedal 18 can be held in the operating state (tilted state) by sandwiching the pedal 18 in the operating state by the left and right vertical frame portions 25A.

  As a result, since the operation pedal device 14 (pilot valve 15) can be maintained in a continuous operation state using the lock frame 25 without depending on the stepping operation of the operator, the operator who operates the excavator 1 The hand breaker 7 can be operated by itself to crush the bedrock, and the workability of excavation work can be improved.

  In this case, the lock frame 25 is supported by the hinge mechanism 26 so as to be pivotable forward and backward with respect to the floor plate 9, so that the operator hooks a toe or the like on the lock frame 25 to rotate the lock frame 25. By doing so, the lock frame 25 can be easily moved between the locked position and the unlocked position.

  Further, the lock frame 25 can be moved to the pedal holding position along the hinge mechanism 26 by the slide mechanism 29 provided between the lock mechanism 25 and the operation pedal device 14 in the operation state. The lock frame 25 can be easily and reliably engaged with the pedal 18, and the pedal 18 can be held in the operating state by using the lock frame 25.

  Further, each male screw 26D protruding from the rotating plate 26C of the hinge mechanism 26 is inserted into the long slot 30A of the slide plate 30 to which the lock frame 25 is fixed, and a nut 31 is screwed into the male screw 26D. The rotating plate 26C and the slide plate 30 are fastened. For this reason, by adjusting the mounting position of the slide plate 30 with respect to the hinge mechanism 26 (the rotation plate 26C), the position adjustment between the lock frame 25 fixed to the slide plate 30 and the pedal 18 can be easily performed. The lock frame 25 can be reliably engaged with the pedal 18 in the operating state.

  In the above-described embodiment, a case where a long slot 30A is provided in the slide plate 30 of the slide mechanism 29 and a male screw 26D projecting from the rotating plate 26C of the hinge mechanism 26 is inserted into the long slot 30A is exemplified. Yes. However, the present invention is not limited to this. For example, a long groove hole may be provided in the rotating plate 26C of the hinge mechanism 26, and a male screw may be provided on the slide plate 30 of the slide mechanism 29.

  In the above-described embodiment, when the lock frame 25 is in the pedal holding position, as shown in FIG. 15, the upper surface of the pedal 18 on which the one vertical frame portion 25A is tilted (the upper surface 22C of the tread 22). And the other vertical frame portion 25A contacts the side surface of the pedal 18 (the side surface 22D of the tread plate 22).

  However, the present invention is not limited to this. For example, as indicated by a two-dot chain line in FIG. 15, one vertical frame portion 25A of the lock frame 25 is brought into contact with the upper surface of the pedal 18 and the other vertical frame portion. 25A may be in contact with the lower surface of the pedal 18. In this case, the slide plate 30 is slid in the direction of arrow C in FIG. 15 within the range of the long slot 30A, and the other vertical frame portion 25A of the lock frame 25 is lowered to the lower side of the pedal 18, and then the slide plate 30 is slid in the direction opposite to the arrow C within the range of the long slot 30A, thereby bringing one vertical frame portion 25A into contact with the upper surface of the pedal 18 and the other vertical frame portion 25A on the lower surface of the pedal 18. It can be made to contact.

  In the embodiment described above, the lock frame 25 in which the pair of left and right vertical frame portions 25A and 25A and the horizontal frame portion 25B are integrally formed by bending one bar is used. This is an example. However, the present invention is not limited to this. For example, a frame-like lock frame may be configured by welding a plurality of bar members to each other.

  Moreover, in embodiment mentioned above, the case where the hand breaker 7 is used is illustrated as an external hydraulic equipment by which supply / discharge of pressure oil is controlled by the operation pedal device 14. However, the present invention is not limited to this, and other external hydraulic equipment such as a tamper (consolidator) may be used.

  In the above-described embodiment, as the operation pedal device to which the pedal lock device 24 is applied, the hydraulic operation pedal device 14 that drives the control valve for supplying and discharging the pressure oil to and from the hand breaker 7 with the pilot pressure is used. The case is illustrated. However, the present invention is not limited to this, and for example, a link type operation pedal device that drives a control valve for supplying and discharging pressure oil to and from the hand breaker 7 by a link may be used.

  Furthermore, in the above-described embodiment, the hydraulic excavator is exemplified as the construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines such as a hydraulic crane and a wheel loader.

1 is a front view showing a hydraulic excavator according to an embodiment of the present invention. It is the top view which looked at the hydraulic excavator from the upper part. It is a top view which shows the operation pedal apparatus in FIG. 2, a pedal lock apparatus, etc. in the state which became the lock position. It is sectional drawing which looked at the operation pedal apparatus, the pedal lock apparatus, etc. from the arrow IV-IV direction in FIG. It is sectional drawing which looked at the operation pedal apparatus and the locking member from the arrow VV direction in FIG. It is a perspective view which shows an operation pedal apparatus and a pedal lock apparatus in the state which became the lock position. It is a disassembled perspective view which shows the pilot valve and pedal which comprise an operation lever apparatus. It is a disassembled perspective view which shows the lock frame, hinge mechanism, and slide mechanism which comprise a pedal lock apparatus. It is sectional drawing which looked at the pedal lock apparatus from the arrow IX-IX direction in FIG. FIG. 4 is a plan view similar to FIG. 3 showing a state in which the pedal lock device is in the unlocked position. It is sectional drawing which looked at the state which the pedal locking device became a lock release position from the arrow XI-XI direction in FIG. FIG. 4 is a plan view similar to FIG. 3 showing a state where the pedal lock device is in the pedal holding position. It is sectional drawing which looked at the state which the pedal locking device became a pedal holding position from the arrow XIII-XIII direction in FIG. It is a perspective view which shows an operation pedal apparatus and a pedal lock apparatus in the state which became a pedal holding position. It is sectional drawing which looked at the state which the pedal lock apparatus became a pedal holding position from the arrow XV-XV direction in FIG.

Explanation of symbols

2 Lower traveling body (car body)
3 Upper swing body (car body)
4 Working device 9 Floor plate 10 Driver's seat 14, 32 Operation pedal device 18 Pedal 24 Pedal lock device 25 Lock frame 25A Vertical frame portion 25B Horizontal frame portion 26 Hinge mechanism 26A Fixing plate (fixing member)
26B Shaft 26C Rotating plate (Rotating member)
26D Male thread (fastening member)
29 Slide mechanism 30 Slide plate (slide member)
30A Long slot 31 Nut (fastening member)

Claims (3)

A self-propelled vehicle body provided with a work device, a driver's seat provided on the floor plate of the vehicle body, an operation pedal device having a pedal provided on the front side of the driver's seat and operated to step, and operation of the pedal In a construction machine comprising: a lock position that prohibits operation; a lock release position that allows operation of the pedal; and a pedal lock device that moves between a pedal holding position that engages and holds the pedal in an operating state. ,
The pedal lock device includes: a lock member capable of contacting an upper surface of the pedal; a hinge mechanism that rotates the lock member between the lock position and the unlock position with respect to the floor plate; and the hinge mechanism; A construction machine comprising a slide mechanism provided between the lock member and a slide mechanism that slides the lock member along the hinge mechanism and moves the lock member to the pedal holding position. The hinge mechanism includes a fixing member fixed to the floor plate, and a rotating member attached to the fixing member so as to be rotatable about an axis.
The slide mechanism is attached to the lock member and extends along the rotation member of the hinge mechanism, and is provided on one of the slide member and the rotation member and extends along the rotation member. The construction machine according to claim 1, comprising a long groove and a fastening member that fastens the slide member and the rotating member through the long groove.   The lock member has a pair of vertical frame portions that are fixed to both ends of the slide member using a bar, and a horizontal frame portion that connects the pair of vertical frame portions and extends along the slide member. The lock frame is configured such that the pair of vertical frame portions are in contact with the upper surface of the pedal at the locked position, and one vertical frame portion is applied to the upper surface of the pedal at the pedal holding position. The construction machine according to claim 2, wherein the construction machine is configured to be in contact with the other vertical frame portion against a side surface or a lower surface of the pedal.

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