JP2019147636A - Handrail device and working machine with the same - Google Patents

Abstract

To provide a handrail device capable of improving safety and working efficiency.SOLUTION: A handrail device has plural struts 2 installed in a standing state on a boom with a space therebetween in a longitudinal direction of the boom, a handrail bar 3 horizontally arranged at a distance apart from each strut 2, a connection member 6 provided at each strut 2 to connect the strut 2 with the handrail bar 3, and a metal fitting 11 engaged in the handrail bar 3 and being movable in the axial direction of the handrail bar 3. The metal fitting 11 has an engaging part 23 engaged in the handrail bar 3, and a projecting part 24 which projects from the engaging part 23 toward the direction intersecting the axial direction and to which a safety belt is attached. The handrail bar 3 is hollow and accommodates the engaging part 23 in its inside, and the handrail bar 3 has a slit 3b formed from one end of the axial direction to the other through which the projecting part 24 passes.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a handrail device provided on a structure and a work machine including the handrail device.

  When transporting large work machines such as crawler cranes between sites, the boom is disassembled and transported, and assembled at the transport destination. At that time, the worker walks on the boom that has been brought down to the ground.

  Therefore, Patent Document 1 discloses a safety device when an operator walks on a structure such as a boom. A linear member having flexibility is stretched along the walking direction on the structure, and the lifeline connecting member is engaged with the linear member so as to be movable along the walking direction.

  However, a linear member such as a rope lacks rigidity as a handrail body. Therefore, Patent Document 2 discloses a crane boom hand in which a plurality of brackets are fixed to a footboard attached to an intermediate boom, and a handrail bar is integrally provided between each stay rotatably attached to each bracket. A sliding device is disclosed. By providing the handrail bar integrally between the stays, the rigidity of the handrail body is increased.

JP-A-11-21078 Japanese Patent Laid-Open No. 10-120365

  However, in the configuration of Patent Document 2, when the hook of the safety belt is hooked on the handrail bar, it is necessary to change the hook at each stay portion when the operator moves on the tread board. When the hook is changed, the connection between the safety belt and the handrail bar is temporarily released, and the changing operation itself is unstable, which may cause a fall accident. In addition, the work is interrupted each time the switching operation is performed, so that work efficiency is reduced.

  The objective of this invention is providing the handrail apparatus which can improve safety | security and work efficiency, and a working machine provided with the same.

  The handrail device of the present invention is arranged on a structure in a horizontal direction with a plurality of support columns provided to be spaced apart from each other in the longitudinal direction of the structure, and spaced from each support structure. A handrail bar, a connecting member that is provided for each of the columns, and connects the column and the handrail rod, a fitting that engages with the handrail rod and is movable in the axial direction of the handrail rod, And the metal fitting has an engaging portion that engages with the handrail rod, and a protruding portion that protrudes from the engaging portion in a direction intersecting the axial direction and to which a safety belt is attached, The handrail rod is hollow and accommodates the engaging portion therein, and the handrail rod has a slit through which the protruding portion passes from one end to the other end in the axial direction. It is characterized by.

  In addition, a work machine according to the present invention includes the above-described handrail device.

  According to the present invention, the engaging portion of the metal fitting is accommodated in the handrail bar, and the handrail bar is formed with a slit through which the protrusion of the metal fitting passes from one end to the other end in the axial direction. Therefore, even if the metal fitting is moved in the axial direction of the handrail bar, the metal fitting does not interfere with the connecting member. Therefore, when the operator moves on the structure, it is not necessary to change the hook of the safety belt with each support. Thereby, safety and work efficiency can be improved.

It is a side view of a crane. It is AA sectional drawing of FIG. It is the figure which looked at FIG. 2 from the B direction. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. 2 in 1st Embodiment. It is EE sectional drawing of FIG. It is FF sectional drawing of FIG. It is a figure which is GG sectional drawing of FIG. It is HH sectional drawing of FIG. It is DD sectional drawing of FIG. 2 in 2nd Embodiment. It is II sectional drawing of FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
(Configuration of crane)
The handrail device according to the first embodiment of the present invention is provided in a crane that is a work machine. As shown in FIG. 1, which is a side view of the crane 30, the crane 30 has a configuration in which an upper swing body 32 is rotatably mounted on a crawler type lower traveling body 31. The work machine is not limited to a crawler crane, and may be a wheel crane, a crawler excavator, a wheel excavator, or the like.

  A boom (structure) 34 is connected to the front part of the upper swing body 32 so as to be raised and lowered with respect to the upper swing body 32. The boom 34 is configured by combining a plurality of unit booms 34a. In FIG. 1, the boom 34 is brought down to the ground in order to perform assembly work or disassembly work.

  A plate-like scaffold plate 35 is attached to the upper surface of each unit boom 34a. The scaffold plate 35 is a scaffold for an operator who performs assembly work or disassembly work of the boom 34. While moving on the scaffolding plate 35, the operator connects the unit booms 34 a, hangs the boom hoisting wire rope 36 around the upper spreader, the winch of the load lifting wire rope 37, and the top sheave 38. Do the sending work up to. A plurality of through holes are formed in the scaffold plate 35, and an operator can visually recognize the lower side through these through holes.

(Configuration of handrail device)
The handrail device 1 includes a plurality of support columns 2, a handrail bar 3, and a bracket 4. The plurality of support columns 2 are provided on one side surface of the boom 34 in a direction orthogonal to the paper surface of FIG. 1 so as to be spaced apart from each other in the longitudinal direction of the boom 34. The brackets 4 are provided as many as the support columns 2, and each bracket 4 is fixed to the boom 34 and supports the support columns 2. The handrail device 1 may be provided on both side surfaces of the boom 34 in the direction orthogonal to the paper surface of FIG.

  The handrail bar 3 is configured by combining a plurality of unit bars 3 a (see FIG. 5) in the longitudinal direction of the boom 34. Adjacent unit bars 3a are concentric with each other, and slits described later are continuous between adjacent unit bars 3a. The support column 2 is provided for each unit bar 3a.

  In addition, if the length of the unit boom 34a is 9m, 12m, etc., for example, the length of the unit rod 3a may be set to 3m which is a common divisor of 9 and 12. Thereby, the versatility of the unit stick | rod 3a can be improved.

  As shown in FIG. 2 which is an AA cross-sectional view of FIG. 1, the bracket 4 includes a use position (solid line) in which the support column 2 protrudes above the boom 34 and a retracted position (withdrawn below the use position). It is supported so as to be movable between (dotted line).

  As shown in FIG. 3, which is a view of FIG. 2 as viewed from the B direction, and FIG. 4, which is a CC cross-sectional view of FIG. doing. The mounting plate 21 is attached to a member constituting the boom 34 by U bolts and nuts or welding. The pipe-shaped member 22 has a pipe shape and is fixed to the mounting plate 21. The support 2 is inserted through the pipe-shaped member 22.

  The pipe-shaped member 22 is formed with a pipe through-hole that penetrates the pipe-shaped member 22 in a direction orthogonal to the axial direction of the pipe-shaped member 22. In addition, pillar upper holes and penetrating holes that penetrate the pillars 2 in the direction orthogonal to the axial direction of the pillars 2 are formed in the upper end portion and the lower end portion of the pillars 2, respectively.

  The handrail device 1 has a fixing pin (fixing means) 5. When fixing the column 2 at the use position, with the column 2 protruding above the boom 34, the fixing pin 5 is inserted into the column through hole at the lower end of the column 2 and the pipe through hole of the pipe-like member 22. Insert. On the other hand, when the column 2 is fixed at the retracted position, the column 2 is lowered until a connecting member (described later) fixed to the upper end of the column 2 or the handrail bar 3 comes into contact with the main material of the boom 34. Thus, the fixing pin 5 is inserted into the support through hole at the upper end of the support 2 and the pipe through hole of the pipe-like member 22.

  As shown in FIG. 5, which is a DD cross-sectional view of FIG. 2, and FIG. 6, which is a EE cross-sectional view of FIG. 5, the handrail device 1 has a connecting member 6. As shown in FIG. 6, the handrail bar 3 is disposed in the horizontal direction with a space from each support column 2. The connecting member 6 is provided for each column 2 and connects the column 2 and the handrail bar 3. In the present embodiment, the connecting member 6 is connected to the end of the unit bar 3a.

  As shown in FIG. 7 which is a FF cross-sectional view of FIG. 6 and FIG. 8 which is a GG cross-sectional view of FIG. 5, the connecting member 6 is attached to the mounting bracket 7 attached to the upper end portion of the column 2. The bolt 8 and the nut 9 are detachably attached. The two connecting members 6 are attached to one mounting bracket 7 so that the ends of the unit rods 3a are in contact with each other.

  Here, the attachment hole 6 a formed in the connecting member 6 is made larger than the diameter of the body portion of the bolt 8. Therefore, it is easy to adjust the attachment position of the connecting member 6. The mounting hole 6 a is closed with a washer 10.

  As shown in FIGS. 5 and 6, the handrail device 1 has a metal fitting 11. The metal fitting 11 engages with the handrail bar 3 and is movable in the axial direction of the handrail bar 3.

  Specifically, the handrail rod 3 has a hollow cylindrical shape, and a slit 3b is formed in the lower part from one end to the other end. The metal fitting 11 has an engaging part 23 and a protruding part 24. The engaging portion 23 has a cylindrical shape, and is engaged with the handrail rod 3 by being housed inside the handrail rod 3. The protruding portion 24 protrudes from the engaging portion 23 downward through the slit 3b. The protrusion 24 is formed with a hook hole 25 in which a hook of a safety belt 41 (see FIG. 2) is hooked.

  The metal fitting 11 is engaged with the handrail bar 3 by the engaging portion 23 being inserted into the handrail bar 3 from the axial end of the handrail bar 3. The metal fittings 11 are engaged with the handrail bar 3 by the number of workers working on the upper surface of the boom 34.

  Thus, the engaging portion 23 of the metal fitting 11 is accommodated in the handrail rod 3, and the handrail rod 3 is formed with a slit 3b through which the protruding portion 24 of the metal fitting 11 passes from one end to the other end in the axial direction. Has been. Therefore, even if the metal fitting 11 is moved in the axial direction of the handrail bar 3, the metal fitting 11 does not interfere with the connecting member 6. Therefore, when the operator moves on the boom 34, there is no need to change the hook of the safety belt 41 with each support column 2. Thereby, safety and work efficiency can be improved.

  A slit 3 b is formed in the lower part of the handrail bar 3, and the protruding portion 24 protrudes downward from the engaging portion 23. Therefore, in the unlikely event that an operator falls and the safety belt 41 is pulled, a force is applied downward to the protruding portion 24, so that the slit 3b is larger than when the protruding portion 24 protrudes upward or laterally. The force applied to is small. Thereby, the deformation | transformation of the slit 3b can be suppressed.

  As described above, the handrail bar 3 is configured by combining a plurality of unit bars 3 a in the longitudinal direction of the boom 34. The boom 34 is configured by combining a plurality of unit booms 34a, and is disassembled during transportation. When the boom 34 is disassembled, the handrail rod 3 is also disassembled, and when the boom 34 is assembled and the handrail device 1 is used, the handrail rod 3 is also assembled. At this time, the adjacent unit bars 3a are concentric, and the adjacent unit bars 3a are connected to each other so that the slits 3b are continuous, thereby suitably moving the metal fitting 11 from one end of the assembled handrail bar 3 to the other end. be able to.

  Here, as shown in FIG. 5, when assembling the handrail bar 3, the metal fitting 11 is used as a jig, and the metal fitting 11 is positioned at a connection portion between adjacent unit bars 3 a. Thereby, the adjacent unit stick | rods 3a can be made concentric by the cylindrical engaging part 23. FIG. Moreover, the adjacent slits 3b can be continued by the protrusion 24.

  Further, both end portions 23a of the engaging portion 23 in the axial direction of the handrail rod 3 are formed in a tapered shape that is tapered in the axial direction. Thereby, the engaging part 23 can be smoothly moved inside the handrail bar 3. Further, even if there is a slight misalignment between the adjacent unit bars 3a, the stepped portion can be overcome by the tapered end portions 23a, so that the engaging portion 23 is reliably moved inside the handrail rod 3. be able to.

  Further, both end portions 24a of the protruding portion 24 in the axial direction of the handrail rod 3 are also formed in a tapered shape that is recessed in the axial direction. Thereby, the protrusion part 24 can be smoothly moved inside the slit 3b.

  Note that a lubricant such as grease may be applied between the inner surface of the handrail bar 3 and the engaging portion 23.

  As shown in FIG. 9, which is a cross-sectional view taken along line HH in FIG. 1, stoppers 12 that prevent the movement of the engaging portion 23 are attached to both ends of the handrail bar 3 in the axial direction of the handrail bar 3. Yes. Specifically, the stopper 12 has a pin shape, and is inserted into a pin hole penetrating the handrail bar 3 in the radial direction so as to be inserted and removed. A retaining pin is inserted through the end of the stopper 12 inserted through the pin hole. Thereby, it can prevent that the engaging part 23 pulls out from the inside of the handrail rod 3 unexpectedly.

  In the above configuration, when the boom 34 is disassembled, the column 2 is fixed at the retracted position. This eliminates the need to separately store or transport the column 2. At this time, the connecting member 6 is removed from the column 2 together with the handrail bar 3. Thereby, since the mass of the unit boom 34a can be reduced, the burden concerning conveyance of the unit boom 34a can be reduced. Further, the support column 2 may be removed from the bracket 4. Thereby, the mass of the unit boom 34a can be further reduced. The support column 2 may be positioned at the retracted position in a state where the handrail bar 3 is connected to the support column 2 by the connecting member 6.

  On the other hand, when the worker works on the boom 34, the support column 2 is fixed to the use position. Then, the handrail bar 3 is connected to the support 2 by attaching the connecting member 6 to the support 2. Thereby, the handrail device 1 can be put into a usable state in a short time. At this time, by using the metal fitting 11 as a jig, adjacent unit bars 3a are concentric and adjacent slits 3b are continuous.

(effect)
As described above, according to the handrail device 1 according to the present embodiment, the engaging portion 23 of the metal fitting 11 is accommodated in the handrail rod 3, and the protruding portion 24 of the metal fitting 11 is provided on the handrail rod 3. A passing slit 3b is formed from one end to the other end in the axial direction. Therefore, even if the metal fitting 11 is moved in the axial direction of the handrail bar 3, the metal fitting 11 does not interfere with the connecting member 6. Therefore, when the operator moves on the boom 34, there is no need to change the hook of the safety belt 41 with each support column 2. Thereby, safety and work efficiency can be improved.

  A slit 3 b is formed in the lower part of the handrail bar 3, and the protruding portion 24 protrudes downward from the engaging portion 23. Therefore, in the unlikely event that an operator falls and the safety belt 41 is pulled, a force is applied downward to the protruding portion 24, so that the slit 3b is larger than when the protruding portion 24 protrudes upward or laterally. The force applied to is small. Thereby, the deformation | transformation of the slit 3b can be suppressed.

  The handrail bar 3 is configured by combining a plurality of unit bars 3a in the longitudinal direction of the boom 34. The adjacent unit bars 3a are concentric with each other, and the adjacent unit bars 3a are provided with slits 3b. They are continuous. The boom 34 is configured by combining a plurality of unit booms 34a, and is disassembled during transportation. When the boom 34 is disassembled, the handrail rod 3 is also disassembled, and when the boom 34 is assembled and the handrail device 1 is used, the handrail rod 3 is also assembled. At this time, the adjacent unit bars 3a are concentric, and the adjacent unit bars 3a are connected to each other so that the slits 3b are continuous, thereby suitably moving the metal fitting 11 from one end to the other end of the assembled handrail bar 3. be able to.

  Moreover, the stopper 12 which prevents the movement of the engaging part 23 is attached to the both ends of the handrail rod 3 in the axial direction of the handrail rod 3. Thereby, it can prevent that the engaging part 23 pulls out from the inside of the handrail rod 3 unexpectedly.

  Further, by forming both end portions 23 a of the engaging portion 23 in the axial direction of the handrail rod 3 in a tapered shape, the engaging portion 23 can be smoothly moved inside the handrail rod 3. Further, even if there is a slight misalignment between the adjacent unit bars 3a, the stepped portion can be overcome by the tapered end portions 23a, so that the engaging portion 23 is reliably moved inside the handrail rod 3. be able to.

  Further, by forming both end portions 24a of the protruding portion 24 in the axial direction of the handrail rod 3 in a tapered shape, the protruding portion 24 can be smoothly moved inside the slit 3b.

  Moreover, the support | pillar 2 is movable between a use position and a storage position, and fixes the support | pillar 2 to the bracket 4 in a use position or a storage position. When the boom 34 is disassembled, it is not necessary to separately store or transport the column 2 by fixing the column 2 in the retracted position. In addition, when the worker works on the boom 34, the handrail device 1 can be put into a usable state in a short time by fixing the column 2 to the use position.

[Second Embodiment]
Next, the handrail device of the second embodiment will be described with reference to the drawings. In addition, description is abbreviate | omitted about the structure which is common in 1st Embodiment, and the effect show | played by it, and a different point from 1st Embodiment is mainly demonstrated. In addition, about the same member as 1st Embodiment, the same code | symbol as 1st Embodiment is attached | subjected.

(Configuration of handrail device)
In the handrail device 101 of the present embodiment, the engagement portion 123 of the metal fitting 111 is formed in a spherical shape as shown in FIG. The protruding portion 124 of the metal fitting 111 has a ring shape, and the portion of the protruding portion 124 that passes through the slit 3b is a neck portion 124a having a circular cross section and a smaller diameter than the width of the slit 3b. The cross-sectional shape of the neck portion 124a may be a quadrangle or a hexagon.

  With such a configuration, as shown in FIG. 11, which is a cross-sectional view taken along the line II of FIG. 10, even if the handrail bar 3 is formed in a curved shape, the engagement portion 123 is formed inside the handrail bar 3. Can be moved smoothly.

(effect)
As described above, according to the handrail device 101 according to the present embodiment, the engaging portion 123 is formed in a spherical shape, and the portion of the protruding portion 124 that passes through the slit 3b has a circular cross section and is wider than the width of the slit 3b. The neck 124a has a small diameter. Thereby, even if the handrail rod 3 is formed not only in a linear shape but also in a curved shape, the engaging portion 123 can be smoothly moved inside the handrail rod 3.

  The embodiment of the present invention has been described above, but only specific examples are illustrated, and the present invention is not particularly limited, and the specific configuration and the like can be appropriately changed in design. Further, the actions and effects described in the embodiments of the invention only list the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what was done.

  For example, the structure provided with the handrail devices 1 and 101 is not limited to the boom 34 of the crane 30 or the attachment of a hydraulic excavator, but may be a scaffold at a work site.

DESCRIPTION OF SYMBOLS 1,101 Handrail device 2 Prop 3 Handrail rod 3a Unit rod 3b Slit 4 Bracket 5 Fixing pin 6 Connecting member 7 Mounting bracket 8 Bolt 9 Nut 10 Washer 11, 111 Metal fitting 12 Stopper 21 Mounting plate 22 Pipe-shaped member 23, 123 Engaging portion 24, 124 Protruding portion 25 Hook hole 30 Crane 31 Lower traveling body 32 Upper turning body 34 Boom 34a Unit boom 35 Scaffold plate 36 Boom hoisting wire rope 37 Cargo lifting wire rope 38 Top sheave 41 Safety belt 124a Neck

Claims (9)

On the structure, a plurality of support columns provided to be spaced apart from each other in the longitudinal direction of the structure;
A handrail bar arranged in a horizontal direction at intervals with respect to each column,
A connecting member provided for each of the columns, and connecting the column and the handrail bar;
A fitting that engages with the handrail bar and is movable in the axial direction of the handrail bar;
Have
The bracket is
An engaging portion that engages with the handrail bar;
A protrusion protruding from the engagement portion in a direction intersecting the axial direction, and a safety band is attached;
Have
The handrail rod is hollow and accommodates the engaging portion therein,
The handrail device is characterized in that a slit through which the protruding portion passes is formed in the handrail bar from one end to the other end in the axial direction. The slit is formed in the lower part of the handrail bar,
The handrail device according to claim 1, wherein the protruding portion protrudes downward from the engaging portion. The handrail bar is configured by combining a plurality of unit bars in the longitudinal direction,
The handrail device according to claim 1 or 2, wherein the adjacent unit bars are concentric, and the slits are continuous between the adjacent unit bars.   The handrail device according to any one of claims 1 to 3, wherein a stopper that prevents movement of the engaging portion is attached to both ends of the handrail rod in the axial direction.   The handrail device according to any one of claims 1 to 4, wherein both end portions of the engaging portion in the axial direction are formed in a tapered shape that is tapered in the axial direction.   The handrail device according to any one of claims 1 to 5, wherein both end portions of the protruding portion in the axial direction are formed in a tapered shape that is tapered in the axial direction. The engaging portion is formed in a spherical shape,
The handrail device according to any one of claims 1 to 6, wherein a portion of the protruding portion that passes through the slit is a neck portion having a smaller diameter than the width of the slit. A bracket that movably supports the support column between a use position protruding above the structure and a storage position retracted below the use position;
Fixing means for fixing the column to the bracket in the use position or the storage position;
The handrail device according to any one of claims 1 to 7, further comprising:   A work machine comprising the handrail device according to any one of claims 1 to 8.

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