JP6197836B2 - Stanchions equipped with mobile cranes - Google Patents

Description

  The present invention relates to a stanchion (handrail) provided on a boom of a mobile crane, which is used when a user gets on the upper surface of a boom and performs assembly / disassembly work of the mobile crane.

Mobile cranes typified by crawler cranes, for example, have a long boom ranging from several meters to several tens of meters, and work to suspend various loads using a hook device provided on this boom (crane work) )I do.
By the way, the mobile crane is transported to a work site after the main body and the boom are individually disassembled and loaded on a truck. At the work site of the transport destination, the main body and the boom that are individually disassembled are assembled by the operator.

When assembling a mobile crane at a work site, an operator may board the upper part (upper surface) of a boom placed on the ground. Further, even in the dismantling work, the worker may get on the upper part of the boom placed on the ground or the like.
The height of the boom placed on the ground is higher than the height of the operator, and in particular, the height of a boom of a large mobile crane is several meters. When assembling and dismantling the mobile crane at the top of the boom, the work place becomes high, so it is necessary to ensure the safety of the operator. As a device for ensuring the safety of the worker at the upper part of the boom, for example, a stanchion (handrail) can be cited. For example, Patent Documents 1 and 2 disclose stanchion techniques.

  The technique disclosed in Patent Document 1 is a working platform device for a crane boom that is provided on a boom and that can be withdrawn from the boom, and includes a scaffold plate that is attached to the back of the crane boom, and the scaffold plate. Between the support | pillar arrange | positioned at a side part, the use position which protruded the said support | pillar above the said scaffold board, and the storage position where the protrusion amount to the upper direction of the said scaffold board becomes smaller than the time of the said use position A bracket that is movably supported; and a restraining means that is disposed between the bracket and the support and can restrain the support to the use position and the storage position.

  The technique disclosed in Patent Document 2 is a crane boom assembly / disassembly safety device that can be attached to and detached from a boom, and includes a support provided with a rope connecting portion for attaching a safety belt on the upper end side, and a crane boom. It consists of a plate-like base member that is detachably bolted via a U-bolt between adjacent lattices of the lattice spanned between the upper main pipes, and provided with an upright mounting portion for the column.

JP-A-8-133671 Japanese Patent Laid-Open No. 8-100377

By the way, in recent years, the demand for safety during assembly and dismantling work of a mobile crane has been increasing. For example, there is a demand for a stance that ensures the safety of an operator who performs assembly / disassembly work at the upper part of the boom to be higher in safety than conventional techniques such as Patent Documents 1 and 2 described above.
For example, if the height of the stanchion is set to the height of the operator's waist, there is a risk that safety may be reduced because there is no rope above the operator's waist, so safety above the operator's waist There is a request to secure this.

In addition, when the height of the stanchion is set to the height of the shoulder of the worker, a large space is formed below the rope, and this space causes a decrease in safety on the lower side of the worker. Therefore, there is a demand for ensuring the safety of the worker's lower side.
In addition, the safety belt has a full harness type (type that allows the belt to pass through the thigh and shoulders in addition to the operator's torso) and a torso belt type. There is also a desire to change the height of the stanchion.

  Therefore, in view of the above-described problems, the present invention provides a stanchion provided in a mobile crane that allows an operator to ensure more safety at the upper part of a mounted boom at the time of assembly / disassembly work of the mobile crane. The purpose is to provide.

In order to achieve the above-described object, the present invention takes the following technical means.
The stanchion provided in the mobile crane according to the present invention has a plurality of long bars arranged at predetermined intervals in the longitudinal direction of the boom in a state where the boom provided in the mobile crane is placed. A stanchion provided in a mobile crane having a body and a rope extending between the plurality of rods, wherein the rod is provided with a plurality of stays around which the rope is spanned It is characterized by being.

Preferably, at least one of the stays may be variable around a longitudinal axis of the rod.
Preferably, of the stays provided on the rod body, one stay may be variable around the longitudinal axis of the rod body.
Preferably, the one stay has a ring shape, and a direction in which the ring surface of the one stay faces is variable in a direction along or intersecting with a longitudinal direction of the boom.

Preferably, the one stay is open at an upper portion and a lower portion, and protrudes in a direction intersecting with a longitudinal axis of the rod body on an outer peripheral surface of a cylindrical member into which the rod body is inserted. It is good to be attached.
Preferably, the one stay may be arranged so as to be rotatable around a longitudinal axis of the rod.

Preferably, of the plurality of stays arranged on the rod body, the one stay is long in the vertical direction, and a double cylindrical configuration in which the rod body is fitted in the one stay. It is good to be said.
Preferably, the one stay is provided at a position corresponding to the waist of the user, and the other stay is provided at a position corresponding to the shoulder of the user.
Moreover, the most preferable form of the stanchion provided in the mobile crane according to the present invention is a plurality of stanches arranged at predetermined intervals in the longitudinal direction of the boom in a state where the boom provided in the mobile crane is placed. A stanchion provided in a mobile crane having a long elongated rod body and a cable body spanned between the plurality of rod bodies, the rope body being hung on the rod body A plurality of stays to be delivered are provided, and at least one of the stays provided on the rod body has a longitudinal axis of the rod body with respect to the other stays disposed above. It is variable around, and is movable in the vertical direction along the longitudinal direction of the rod.
Further preferably, in a state in which the rod body is extended on the boom, the other stay is fixed in one direction and the one stay is arranged around the longitudinal axis of the rod body. It is good to be fixed to the said rod, and to be deployed, after rotating to a predetermined direction.
Preferably, the rod body is configured to be able to project and retract with respect to the boom.

  According to the stanchion provided in the mobile crane of the present invention, the operator can ensure safety more in the upper part of the mounted boom at the time of assembly / disassembly work of the mobile crane.

It is the figure which showed the outline of the mobile crane at the time of an assembly and disassembly operation | work, and is the figure which showed the state in which the boom was installed in the substantially horizontal direction. It is the figure which showed typically the stanchion with which the mobile crane concerning embodiment of this invention was equipped, and is a figure which shows the overhang | projection state of the rod body arranged by the side of the boom. It is the side view to which the upper part of the bar which comprises the stanchion concerning the embodiment of the present invention was expanded. It is the top view to which the upper part of the bar which comprises the stanchion concerning the embodiment of the present invention was expanded. It is a top view at the time of changing the attachment angle of one stay which comprises a stanchion. It is the figure which showed typically the structure of the stanchion concerning embodiment of this invention. It is the figure which showed typically the one stay which comprises a stanchion. It is the figure which showed the storing state of the rod which comprises a stanchion. It is the figure which showed the 1st modification of the stanchion concerning embodiment of this invention. It is the figure which showed the 2nd modification of the stanchion concerning embodiment of this invention, and is the figure which showed the protrusion state of the rod. It is the figure which showed the 2nd modification of the stanchion concerning embodiment of this invention, and is the figure which showed the storing state of the rod.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a stanchion that is provided on the side of the boom 6 of the mobile crane 1 and ensures the safety of the operator when the operator performs assembly / disassembly work of the mobile crane 1 on the upper part of the boom 6. Will be described. However, before that, the mobile crane 1 provided with a stanchion will be described by taking a lattice boom type crawler crane as an example.

FIG. 1 is a diagram showing an outline of a lattice boom type crawler crane 1 in a state during assembly / disassembly work, and therefore, some members constituting the crawler crane 1 are omitted.
As shown in FIG. 1, a mobile crane 1 (hereinafter simply referred to as a crane) in the present embodiment is a lattice boom type crawler crane provided with a lattice boom 6, and includes an upper swing body 2 and an upper swing body 2. A lower traveling body 4 that travels while being supported from below is provided.

The lower traveling body 4 is provided with endless tracks (crawlers 5) formed in a ring shape made of metal that can travel on the ground and road surfaces at both ends in the left-right direction. A turning means 3 is provided at the center upper part so as to turn freely and turn around a longitudinal axis.
The upper swing body 2 is provided with a long boom 6 that suspends a hook device or the like via a suspension rope, and is provided in front of the center in the left-right direction so as to be substantially parallel to the boom 6. A main winding drum 7 for winding the main winding wire rope is provided behind the boom 6.

  A long boom 6 provided in a large crane such as a lattice boom type crawler crane 1 is divided into a plurality of segments. When the crane 1 is assembled, a plurality of segments are connected by an operator and assembled as a long boom 6. On the other hand, when the crane 1 is disassembled, it is disassembled for each segment by an operator and loaded on a truck for transportation.

  Further, the upper swing body 2 is provided with a cab 8 (operator's cab) in which an operation unit for operating the boom 6 is disposed in front of one side (right side) in the left-right direction, and a crane such as an engine. An engine guard 9 that houses a device for driving 1 is provided behind the cab 8. The upper swing body 2 is provided with a mast 10 extending in an intersecting direction with respect to the boom 6 at the upper portion, and a counterweight carriage 11 is provided at the rear.

By the way, when assembling / disassembling the crane 1, that is, when connecting / disassembling the segments of the boom 6, a stanchion 12 (handrail) is provided on the upper portion (upper surface) of each segment of the boom 6.
Here, as shown in FIG. 2, the upper part of the boom 6 indicates the upper side of the boom 6 in a state of being placed substantially horizontally with respect to the floor surface such as the ground or the road surface. 2 is the left-right (width) direction of the boom 6, and the left-right direction of FIG. 2 is the front-rear direction (longitudinal direction) of the boom 6.

  In the following description of the present embodiment, one segment of the boom 6 that has been disassembled into a plurality of segments will be described as an example. Further, the stanchion 12 of the present embodiment will be described by exemplifying that provided on the right side of the boom 6 (right side as viewed from the base end side of the boom 6). Note that the stanchion 12 of the present embodiment is applicable even if it is provided on the left side or both sides of the boom 6.

Further, in the present embodiment, the stance 12 that can be stored in the boom 6 will be described as an example. However, even in the case of the stanchion 12 that is detachable from the boom 6, the technology of the present embodiment is not limited. Applicable.
This stanchion 12 is for ensuring the safety of the worker who is assembling / disassembling work on the upper part of the boom 6.

  The stanchion 12 according to the present embodiment is provided on the right side of the boom 6 and is movable in the vertical direction with respect to the boom 6. When assembling / disassembling the boom 6, the rod body 13 constituting the stanchion 12 is projected so as to protrude upward from the upper portion of the boom 6 (the rod body 13 is projected). When the disassembly work is finished, the rod body 13 is stored inside the boom 6 (the storage state of the rod body 13).

Note that the retractable stanchion 12 according to the present embodiment functions in a state where the boom 6 is placed on the ground surface or road surface, and is not retracted during the crane operation. It is locked to.
As shown in FIGS. 2 and 3, the stanchions 12 of this embodiment are provided for each segment of the boom 6, and a plurality of stanchions 12 are arranged at predetermined intervals in the longitudinal direction of the boom 6. Rod body 13, hooks 15 and 17 are provided at both ends, and rope bodies 14 and 16 (rope bodies) spanned between the plurality of rod bodies 13 via hooks 15 and 17. The rod body 13 is provided with a plurality of ring-like stays on which the hooks 15 and 17 are hooked.

That is, the stanchion 12 of the present embodiment is a two-stage handrail (safety fence) in which two rope bodies 14 and 16 are stretched. In the present embodiment, a two-stage handrail is used, but a plurality of ropes may be stretched to form a multistage handrail.
Note that the ropes 14 and 16 (strings) and the hooks 15 and 17 of this embodiment are those of ordinary skill in the art, and safety is ensured when assembling and dismantling the crane 1 such as ropes and chains. If it can do, it will not specifically limit.

  The rod 13 is a pole formed of a cylindrical pipe material having an open upper end and a lower end, and has a length such that the upper portion is approximately at a position corresponding to the shoulder of the operator when in an overhanging state. Has been. That is, the length of the rod 13 is such that one stay 18 corresponding to the waist of the worker and another stay 21 corresponding to the shoulder of the worker (both will be described in detail later) are provided on the rod 13. For this reason, the height of the worker is about the height of the worker including the portion (lower part) to which the rod 13 in the overhanging state is fixed.

A through hole into which a pin 26 for maintaining the protruding state of the rod 13 is inserted is formed in the lower portion (base end side) of the rod 13.
Further, a pin 26 for supporting the cylindrical member 20 to which the one stay 18 is attached in the midway portion in the longitudinal direction is inserted into the midway portion in the longitudinal direction of the rod body 13 when the rod body 13 is in the extended state. A plurality of through-holes are formed. The through hole in the middle of the longitudinal direction of the rod body 13 is used to fix the rod body 13 even when the rod body 13 is stored.

Another stay 21 for receiving the hook 17 provided on the second cable body 16 is attached to the upper portion (front end side) of the rod body 13. Hereinafter, one stay 18 may be referred to as an “intermediate stay” and the other stay 21 may be referred to as an “upper stay”.
By the way, the same number of brackets 23 as the rods 13 are provided on the upper right side of the boom 6 while guiding the rods 13 in the vertical direction and maintaining the overhanging / retracting state.

The bracket 23 includes a cylindrical member 24 (hereinafter referred to as a bracket member) that guides the rod 13 in the vertical direction, and a base 25 to which the bracket member 24 is attached and fixed to the boom 6. doing.
The bracket member 24 has an inner peripheral diameter that is substantially the same as the outer peripheral diameter of the rod body 13, and is shorter than the rod body 13. The bracket member 24 stably supports the lower portion of the rod body 13 when the rod body 13 is overhanging, and supports the rod body 13 so as not to drop downward when the rod body 13 is retracted. It is. A hole is formed in the outer peripheral surface of the bracket member 24, and a pin 26 for maintaining the overhanging / retracting state of the rod 13 is inserted into the hole.

The base 25 is a plate having a predetermined width, and a bracket member 24 is fixed to a flat surface on one side by welding or the like.
The bracket 23 is arranged on the right side of the boom 6 so that the bracket member 24 fixed to one plane of the base 25 is located on the outer side on the right side of the boom 6 and the longitudinal axis is directed in the vertical direction. It is attached via a fastener 28 such as a bolt.

  As shown in FIGS. 2 to 4, the upper stay 21 (other stay) is a hook receiver that receives the hooks 17 provided at both ends of the second cable body 16 stretched on the upper stage. 6, the crane 1 is deployed so as to be near the shoulder of an operator who performs assembly / disassembly work of the crane 1. The upper stay 21 is fixed and arranged in one direction when the rod body 13 is extended.

In the present embodiment, the upper stay 21 is formed in a linear shape so that a cylindrical bar having a short diameter and a small diameter is bent into a U shape, and the curved portion is positioned above the bar body 13. These parts are attached to the upper outer peripheral surface of the rod body 13 to form a ring shape.
That is, the upper stay 21 curved in a U-shape is mounted so as to extend from one side of the upper outer peripheral surface of the rod 13 to the other side so as to protrude upward from the upper part of the boom 6. Is.

With respect to the direction of the upper stay 21, the flat surface (ring surface 22) including the inner side of the ring shape faces the one direction of the boom 6 in the protruding state of the rod body 13.
Specifically, as shown in the left and right views of FIG. 3A, when focusing on one segment, the upper stay 21 on the rear end side and the front end side of the boom 6 is viewed from the side of the boom 6. The U-shaped curved portion is fixedly deployed so that the ring surface 22 faces the left-right direction of the boom 6 so that the curved portion projects upward.

In other words, as shown in the left and right views of FIG. 3B, the upper stay 21 has a cross axis 30 (two-dot chain line) penetrating the ring surface 22 in a plan view of the boom 6 in the front-rear direction of the boom 6. It can be said that it is fixedly deployed so as to be substantially orthogonal to the direction.
On the other hand, as shown in the center diagram of FIG. 3A, one or a plurality of upper stays 21 provided on the rod 13 in the middle in the front-rear direction of the boom 6 are curved in a U shape in a side view of the boom 6. The bent portion is fixedly deployed so that the curved portion projects upward and the ring surface 22 faces the front-rear direction of the boom 6.

In other words, as shown in the center diagram of FIG. 3B, the upper stay 21 has an intersecting axis 30 (two-dot chain line) passing through the ring surface 22 in a plan view of the boom 6 along the longitudinal direction of the boom 6. It can also be said that it is fixedly deployed.
In summary, the upper stay 21 is configured so that either the “ring surface 22 faces the front-rear direction of the boom 6” or “the ring surface 22 faces the left-right direction of the boom 6” is directed toward the rod 13. Fixedly deployed at the top.

As shown in FIGS. 2 to 5, the intermediate stay 18 (one stay) is a hook receiver that receives the hooks 15 provided at both ends of the first rope body 14, and is a crane in a side view of the boom 6. It is deployed so as to be near the waist of the worker who performs the assembly / disassembly work of 1.
The intermediate stay 18 is variously arranged around the longitudinal axis at the midway portion in the longitudinal direction of the rod body 13 with respect to the upper stay 21 fixedly arranged at the upper portion of the rod body 13 in the protruding state of the rod body 13. Can be deployed in any direction. That is, the intermediate stay 18 of the present embodiment has a variable deployment position (an angle around the longitudinal axis of the rod 13).

As shown in FIG. 5, the intermediate stay 18 of the present embodiment is open at the top and bottom, and the outer periphery of a cylindrical member 20 (hereinafter referred to as a stay base) into which the rod 13 is inserted (inserted). It is attached to the surface. The stay base 20 is movable in the vertical direction along the rod body 13 by inserting the rod body 13 therein.
Similar to the upper stay 21, the intermediate stay 18 is a member formed into a ring shape by curving a columnar bar material having a short length and a small diameter into a U shape. The intermediate stay 18 is attached in contact with the outer peripheral surface of the stay base 20 so that the curved portion protrudes in the radially outward direction of the stay base 20. In other words, the U-shaped curved intermediate stay 18 protrudes in a direction intersecting with the longitudinal axis of the rod body 13 when it is provided on the rod body 13, and is formed on the outer peripheral surface of the stay base 20. It is what is attached.

Further, two holes 27 are formed on the outer peripheral surface of the stay base 20 at positions where the holes 27 face each other. That is, the hole 27 is formed so as to penetrate the outer peripheral surface of the stay base 20.
In the stay base 20 to which the intermediate stay 18 is attached, a pin 26 is inserted into a through hole in which the axial center of the hole 27 and the axial center of the through hole of the rod body 13 are aligned. Supported in midway.

The direction of the intermediate stay 18 is such that a flat surface (ring surface 19) including the inside of the ring shape is variable around the longitudinal axis of the rod body 13 when the rod body 13 is extended. That is, the projecting direction of the intermediate stay 18 can be arranged by changing the angle of the ring surface 19 around the longitudinal axis of the rod 13.
3A, when attention is paid to one segment, the intermediate stay 18 on the rear end side of the boom 6 is curved in a U shape in a side view of the boom 6. It is deployed (supported) in a state in which the curved portion side protrudes forward and the ring surface 19 faces the left-right direction of the boom 6.

That is, as shown in the left diagram of FIG. 3B, the intermediate stay 18 on the rear end side of the boom 6 is in a state in which the curved portion side is along the front-rear direction of the boom 6 in the plan view of the boom 6 and the front direction. It can be said that it has been deployed.
3A, the intermediate stay 18 on the front end side of the boom 6 has a curved portion that is curved in a U shape in a side view of the boom 6 and projects toward the rear. 19 is deployed with the boom 6 facing in the left-right direction.

3B, the intermediate stay 18 on the front end side of the boom 6 faces the rear side in a state where the curved portion side is along the front-rear direction of the boom 6 in a plan view of the boom 6. It can be said that it is deployed.
When attention is paid to one segment, the intermediate stay 18 on the rear end side and the front end side of the boom 6 has a cross axis 29 (one-dot chain line) penetrating the ring surface 19 in a plan view of the boom 6. It can be said that they are arranged so as to be substantially orthogonal to the front-rear direction. That is, the intermediate stays 18 on the rear end side and the front end side of the boom 6 are disposed so as to face each other.

On the other hand, as shown in the center diagram of FIG. 3A, in one or a plurality of intermediate stays 18 provided in the rod body 13 in the middle in the front-rear direction of the boom 6, the curved portion curved in a U shape is on the right. It is deployed (supported) with the ring surface 19 projecting outward and the ring surface 19 facing the front-rear direction of the boom 6.
In other words, as shown in the center diagram of FIG. 3B, the one or more intermediate stays 18 have a cross axis 29 (one-dot chain line) penetrating the ring surface 19 in a plan view of the boom 6. It can be said that it is deployed along the direction.

In addition, the intermediate stay 18 can be arranged as shown in FIG. 3C. In other words, the intermediate stay 18 of the present embodiment can be extended (supported) by projecting in various directions.
For example, as shown in the diagram on the left side of FIG. 3C, when attention is paid to one segment, the intermediate stay 18 on the rear end side of the boom 6 is arranged in a state where the curved portion side protrudes to the right outside of the boom 6. (The rotation position of the stay base 20 with respect to the rod 13 can be set). In this case, the ring surface 19 faces the diagonally right rear direction of the boom 6.

That is, the intermediate stay 18 on the rear end side of the boom 6 can be deployed in a state where the curved portion side protrudes obliquely forward to the right in a plan view of the boom 6.
On the other hand, as shown in the right side view of FIG. 3C, the intermediate stay 18 on the front end side of the boom 6 has a curved portion on the right outer side of the boom 6 so as to correspond to the intermediate stay 18 on the rear end side of the boom 6. It is possible to deploy (set the rotation position of the stay base 20 with respect to the rod 13) in a state of overhanging. In this case, the ring surface 19 faces in the diagonally right front direction of the boom 6.

In other words, the intermediate stay 18 on the front end side of the boom 6 can be deployed in a state in which the curved portion side protrudes obliquely rearward rightward in a plan view of the boom 6.
The intermediate stays 18 on the rear end side and the front end side of the boom 6 have a cross axis 29 (one-dot chain line) passing through the ring surface 19 in a plan view of the boom 6 when the boom 6 is viewed in plan view. It can be deployed (supported) in a direction that does not follow the front-rear direction and the left-right direction.

3C, one or a plurality of intermediate stays 18 provided on the rod 13 in the middle of the front-rear direction of the boom 6 are curved in a U shape in a plan view of the boom 6. The bent portion is extended (supported) in a state where the curved portion protrudes rightward and the ring surface 19 faces the front-rear direction of the boom 6.
In summary, the intermediate stay 18 is disposed in the middle in the longitudinal direction of the rod 13 with its overhanging direction directed in an arbitrary direction around the longitudinal axis of the rod 13.

As described above, the stanchion 12 is provided with the intermediate stay 18 and the upper stay 21 on the rod 13, and the stays 18 and 21 are stretched with the ropes 14 and 16 to form a two-stage boom. In the upper part of 6, the worker can secure the safety and perform the assembly / disassembly work of the crane 1.
Further, by arranging the intermediate stay 18 in a state as shown in FIGS. 3A and 3B, that is, in a state where the curved portion is along the front-rear direction of the boom 6 (the state where the ring surface 19 faces the left-right direction of the boom 6), Since the extending direction of the intermediate stay 18 and the pulling direction of the first cable body 14 are substantially on the same axis and in opposite directions (in a state of pulling), the hook 15 hooked on the curved portion is reliably received. be able to.

Further, the projecting direction of the intermediate stay 18 is a direction that obliquely intersects with the front-rear direction of the boom 6 (a direction in which the ring surface 19 obliquely intersects with the left-right direction of the boom 6). Since it can be made variable around the axis, it is possible to change the deployment position of the intermediate stay 18 in accordance with the state of assembly / disassembly work of the crane 1.
For example, as illustrated in FIG. 3C, the intermediate stays 18 at the front end portion and the rear end portion of the boom 6 are arranged so as to project outward from the boom 6, so that the first cable body 14 is placed in the middle portion of the boom 6. It is possible to pass through a certain distance with respect to the stay base 20 arranged in the. That is, the first rope 14 and the stay base 20 in the middle of the boom 6 do not come into contact with each other.
[Mode of operation]
Below, the operation | movement aspect of the stanchion 12 of above-described this embodiment is demonstrated.

In describing the use of the stanchion 12 of the present embodiment, first, the state before the assembly / disassembly work of the crane 1, that is, the retracted state of the stanchion 12 is started.
As shown in FIG. 6, the stanchion 12 of the present embodiment is transported for each segment, and a rod body 13 is stored inside the right side of the boom 6 placed on the ground or the like for each segment. 13 is a state in which the pin 26 is inserted into the hole after the axial center of the through hole 13 in the middle in the longitudinal direction is aligned with the axial center of the hole formed in the bracket member 24.

The intermediate stay 18 is supported so that the lower end surface thereof is in contact with the upper end surface of the bracket member 24 and does not fall downward. That is, this support state is the storage state of the intermediate stay 18.
Here, the operator who performs the assembly work of the crane 1 removes the pin 26 in which the through hole in the middle of the longitudinal direction of the rod body 13 and the through hole of the bracket member 24 are inserted, and the rod body 13 is removed. Lift up. Then, the axial center of the through hole formed in the lower part (base end side) of the rod body 13 and the axial center of the hole of the bracket member 24 are aligned, and the pin 26 is inserted into the aligned hole, so that the rod body 13 is fixed to the bracket member 24 to be in an overhanging state.

  When all the rod bodies 13 are in an overhanging state protruding above the boom 6, the intermediate stay 18 (ring surface 19) is directed in an arbitrary direction in the middle in the longitudinal direction, and the stay to which the intermediate stay 18 is attached. The axial center of the hole 27 of the base 20 and the axial center of the through hole in the longitudinal direction of the rod 13 are aligned, and the pin 26 is inserted into the combined hole 27 to support the intermediate stay 18. The overhanging direction of the intermediate stay 18 may be as shown in FIG. 3B or as shown in FIG. 3C.

This overhanging operation is performed on the rod body 13 provided in the boom 6 for every segment.
When the projecting work of the rod 13 is finished, the ropes 14 and 16 such as ropes are stretched. First, the first cable body 14 is passed through an intermediate stay 18 disposed in the rod body 13, which is disposed in one or more middle portions in the front-rear direction of the boom 6, and the front end portion side and the rear end portion side of the boom 6 are disposed. Hooks 15 provided at both ends of the first cable body 14 are hung on the intermediate stay 18 provided on the rod body 13.

Subsequently, the second rope body 16 is passed through the upper stay 21 provided in the rod body 13 provided in one or more middle parts in the front-rear direction of the boom 6, and the front end side and the rear end side of the boom 6 The hooks 17 provided at both ends of the second cable body 16 are hung on the upper stay 21 provided on the rod body 13.
The operation of stretching the first cable body 14 and the second cable body 16 is performed for every segment so that the crane 1 can be assembled and disassembled (see FIG. 2).

On the other hand, when changing from the projecting state of the stanchions 12 to the retracted state in the present embodiment, the ropes 14 and 16 stretched via the hooks 15 and 17 are removed from the respective stays. Then, the pin 26 that fixes the intermediate stay 18 is removed, and the intermediate stay 18 is moved downward.
The pin 26 inserted in the through hole in the lower portion (bracket member 24) of the rod body 13 is removed, and the rod body 13 is lowered. The axial center of the through hole in the middle portion in the longitudinal direction of the rod body 13 lowered and the axial center of the through hole of the bracket member 24 are aligned, and a pin 26 is inserted into the through hole, so that the rod body 13 is attached to the bracket member 24. To the storage state (see FIG. 6).

In the stanchion 12 of the present invention described above, a safety belt attached to the operator's waist is hooked on the first cable body 14 via a hook, and is attached to the shoulder of the operator on the second cable body 16. A safety belt is hung through the hook.
In this way, by using the stanchion 12 of the present invention that can latch the safety belt attached to the operator's waist and the safety belt attached to the shoulder, the crane 1 The safety of the worker who performs the assembly / disassembly work can be further improved.

Further, by making the intermediate stay 18 movable in the vertical direction, it is possible to reduce the amount of protrusion to the upper surface of the boom 6 when the rod body 13 is stored. Therefore, the influence on the transportation height when the boom 6 is transported can be reduced, that is, the transportation height of the boom 6 can be lowered. Further, it is possible to reduce a risk that the hanging rope is caught on the intermediate stay 18 and the upper stay 21 during the crane work.
[First Modification]
Next, a first modification of the stanchion 12 of the present embodiment described above will be described with reference to the drawings.

As shown in FIG. 7, the stanchion 12 according to the first modified example of the present embodiment supports the intermediate stay 18 so as to be rotatable around the longitudinal axis of the rod body 13 in the middle portion in the longitudinal direction of the rod body 13. This will be described with a focus on only the method of arranging (supporting) the intermediate stay 18.
In addition, since the structure of the stanchion 12 of this modification is the same as that of embodiment (refer FIGS. 2-6) described above, description is abbreviate | omitted.

  In this modification, first, the stay base 20 to which the intermediate stay 18 is attached is moved so as to be located above the through hole formed in the midway portion in the longitudinal direction of the rod body 13, and the through hole of the rod body 13 is moved. Insert a pin 26 longer than the diameter of the stay 20. The lower surface side of the stay base 20 is brought into contact with the outer peripheral surface of the inserted long pin 26 and can be rotated around the longitudinal axis of the rod 13 from the lower side of the stay base 20 (intermediate stay 18). To support.

  In this way, by arranging the intermediate stay 18 so as to be rotatable around the longitudinal axis of the rod 13 in the middle of the rod 13 in the longitudinal direction, for example, when focusing on one segment, the boom 6 When the hook 15 is hung on the intermediate stay 18 provided on the front end portion and the rear end portion of the first hook 14 and the first cable body 14 is stretched, the intermediate stay 18 faces the pulling direction of the first cable body 14. The first cable body 14 rotates so as to have the shortest length, and is fixed by the tension of the first cable body 14.

In other words, in the present modification, the intermediate stay 18 rotates around the longitudinal axis of the rod 13 so that the extension direction of the intermediate stay 18 and the pulling direction of the first cord 14 are automatically substantially the same. Since it is in the direction on the axis and in the opposite direction (a state of pulling), the hook 15 applied to the curved portion can be reliably received.
[Second Modification]
Furthermore, a second modification of the stanchion 12 of the present embodiment described above will be described with reference to the drawings.

As shown in FIGS. 8A and 8B, the stanchion 12 according to the second modified example of the present embodiment has a point that the intermediate stay 18 is long in the vertical direction, and the rod body 13 is inside the intermediate stay 18. There is a feature in the fitting point, and explanation will be made by paying attention to the intermediate stay 18 and the rod body 13.
Since other members constituting the stanchion 12 of this modification are the same as those in the first embodiment (see FIGS. 2 to 6) described above, detailed description thereof will be omitted.

The intermediate stay 18 of the present modification is a member formed of a cylindrical pipe member having an open upper end and a lower end, and is formed so as to be in a position corresponding to the operator's waist when in an extended state. ing.
The intermediate stay 18 is a member that is longer in the vertical direction than the rod 13 on which the upper stay 21 is provided. The intermediate stay 18 is inserted into the bracket member 24 in a penetrating manner, and has an outer diameter that is substantially the same as or slightly smaller than the inner diameter of the bracket member 24. Further, a through hole into which a pin 26 for maintaining the extended state of the intermediate stay 18 is inserted is formed in the lower portion (base end side) of the intermediate stay 18.

  On the other hand, the rod 13 of the present modification is a member that is shorter than that described in the first embodiment. The length of the bar 13 in the vertical direction is, for example, about half the length of the intermediate stay 18 of the present modification (a length extending from the upper part to the middle of the intermediate stay 18 of the present modification). It may be said. That is, it is desirable that the rod body 13 of this modification has a length that allows the upper stay 21 to be positioned on the shoulder of the operator.

A through hole into which a pin 26 for maintaining the protruding state of the rod body 13 is inserted is formed in the lower portion (base end side) of the rod body 13.
That is, in this modified example, as shown in FIG. 8A, the rod 13 is inserted through the intermediate stay 18 and the intermediate stay 18 is inserted through the bracket member 24. When the intermediate state 18 and the bar 13 are lifted upward when the projecting state is set, the bar 13 and the intermediate stay 18 are provided to extend.

On the other hand, as shown in FIG. 8B, when the stanchion 12 is in the retracted state, when the intermediate stay 18 and the rod body 13 of the present modification are lowered, the intermediate stay 18 and the rod body 13 are retracted. Become.
In summary, the intermediate stay 18 and the rod body 13 of this modification, that is, the stanchion 12 of this modification have a telescopic structure that is telescopic.

  As described above, according to the stanchion 12 configured to be extendable and retractable, a space is created below the intermediate stay 18 in the retracted state. Therefore, when the boom 6 is transported to the work site by a truck or the like, Can be prevented from interfering with a partition provided on the side of the truck bed. Moreover, according to this modification, even if the height of the mounted boom is relatively low, interference with members below the boom 6 can be avoided.

Each embodiment disclosed this time should be considered as illustrative in all points and not restrictive.
For example, the stanchion 12 of the present invention is a technique that can be provided in various types of cranes, that is, construction machines, in addition to the illustrated mobile crane 1 (lattice boom type crawler crane).

Further, in each of the stays 18 and 21, particularly the intermediate stay 18, the bar has been described as being curved in a U-shape, but the U-shape and members are only examples. If it is a shape and member which can receive the hooks 15 and 17 with which 16 was equipped, it will not specifically limit.
In each embodiment disclosed this time, matters that are not explicitly disclosed, such as operating conditions and operating conditions, various parameters, dimensions, weights, volumes, and the like, deviate from a range that is normally implemented by those skilled in the art. Instead, values that can be easily assumed by those skilled in the art are employed.

1 Mobile crane (crawler crane)
2 Upper revolving structure 3 Revolving means 4 Lower traveling structure 5 Crawler 6 Boom 7 Main winding drum 8 Cab (operating room)
9 Engine guard 10 Mast 11 Counterweight cart 12 Stansion (handrail)
13 Rod 14 First rope 15 Hook 16 Second rope 17 Hook 18 One stay (intermediate stay)
19 Ring surface 20 Cylindrical member (stay stand)
21 Other stays (upper stay)
22 Ring surface 23 Bracket 24 Cylindrical member (bracket member)
25 Base 26 Pin 27 Hole 28 Fastener 29 Cross axis (one stay)
30 Cross axis (other stays)

Claims (8)

In a state where the boom provided in the mobile crane is placed, a plurality of long rods arranged at predetermined intervals in the longitudinal direction of the boom and the plurality of rods are spanned. A stanchion provided in a mobile crane having a cable body,
The rod body is provided with a plurality of stays around which the cable body is stretched ,
Of the stays arranged in the rod body, at least one stay is variable around the longitudinal axis of the rod body with respect to the other stays arranged above, and A stanchion provided in a mobile crane, characterized in that it is movable in the vertical direction along the longitudinal direction of the rod . In the projecting state of the rod body on the boom, the other stay is fixed and arranged in one direction, and the one stay is rotated around the longitudinal axis of the rod body. It is fixed and deployed to the rod body in the specified direction.
The stanchion provided in the mobile crane according to claim 1. The stanchion provided in the mobile crane according to claim 1 or 2, wherein the rod body is configured to be able to project and retract with respect to the boom. The one stay is ring-shaped, and a direction of a ring surface of the one stay is variable in a direction along or intersecting with a longitudinal direction of the boom. Item 3. A stanchion provided in the mobile crane according to item 1 or 2 . The one stay is attached so as to protrude in a direction intersecting the longitudinal axis of the rod body on an outer peripheral surface of a cylindrical member having an upper portion and a lower portion opened and into which the rod body is inserted. The stanchion provided in the mobile crane according to any one of claims 1 to 4 . The stanchion provided in the mobile crane according to any one of claims 1 to 5 , wherein the one stay is provided so as to be rotatable around a longitudinal axis of the rod body.   Of the stays provided on the rod body, the one stay is elongated in the vertical direction, and has a double cylindrical configuration in which the rod body is fitted in the one stay. The stanchion provided in the mobile crane according to any one of claims 1 to 4. The one of the stay, together are deployed in a position corresponding to the waist of the user, the other stay is any of claims 1 to 7, characterized in that it is deployed at a position corresponding to the shoulder portion of the user's A stanchion provided in the mobile crane described in Crab.