Working machinery

Abstract

To provide a work machine capable of efficiently performing work for developing or storing a scaffold equipped with a handrail.SOLUTION: A work machine 1 includes a main body part 3 of the work machine 1, a scaffold 10 mounted on the main body part 3 to be arranged on the side of the work machine 1, and a handrail 11 integrally provided with the scaffold 10. The scaffold 10 is rotatably mounted between a development position in which the scaffold is overhung toward the side of the work machine 1 and a stored position in which the scaffold approaches the side surface of the work machine 1. The scaffold 10 can be stored at the stored position while being integrated with the handrail 11.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a working machine, and particularly to a working machine provided with a scaffold.

Background Art

[0002] Patent Document 1 describes a working machine configured such that a scaffold (also referred to as a catwalk or the like) of the working machine can be deployed from a storage position close to the side surface of the working machine to a deployed position projecting to the side of the working machine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, although not described in Patent Document 1, handrails may be installed on the scaffold for the safety of the operator. In that case, it is necessary to remove the handrails from the scaffold during transportation of the working machine or attach the handrails to the scaffold during work. However, with such a configuration, problems such as the work of attaching and detaching the handrails to and from the scaffold becoming complicated and the work of attaching and detaching taking time occur.

[0005] The present invention has been made in view of the above points, and an object thereof is to provide a working machine capable of efficiently performing the work of deploying and storing a scaffold provided with handrails. [[ID=4​​​​​​​​​​A handrail provided integrally with the aforementioned scaffolding, Equipped with, The scaffolding is positioned between an extended position that extends to the side of the work machine and a retracted position that is close to the side of the work machine. Around the pivot axis It is mounted in a rotatable manner, The scaffolding is designed to be stored in the storage position in an integrated state with the handrail. 、 The handrail is switchable between an upright position, where it is erected from the scaffolding in the deployed position, and a retracted position, where it is folded down toward the scaffolding from the upright position. The scaffolding is configured to change position between a first position and a second position which is lower in the height direction of the main body than the first position, while in the deployed position which is maintained so as not to rotate further at the pivot end around the pivot axis. It is. [Effects of the Invention]

[0007] According to the present invention, it becomes possible to efficiently deploy and retract scaffolding equipped with handrails. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view of the crane as a work machine according to this embodiment. [Figure 2] This diagram shows the scaffolding in its deployed position. [Figure 3] This diagram shows the auxiliary handrail in the lowered position by pushing it into the main handrail body. [Figure 4] This diagram shows the auxiliary handrail in a state where it has been pulled out from the main handrail body. [Figure 5] This diagram shows the scaffolding rotated and retracted while the handrail remains extended from the scaffolding. [Figure 6] This diagram shows the scaffolding rotated and stored with the handrails folded outwards. [Figure 7] This diagram shows the scaffolding in a retracted state, with the handrails folded down towards the scaffolding and the scaffolding rotated to accommodate them. [Figure 8] (a) is a perspective view showing the structure of the scaffolding, and (b) is a side view showing the front frame removed. [Figure 9] (a) is a perspective view showing the state with the stopper released, and (b) is a side view showing the state in which the scaffolding can rotate around the axis of rotation. [Figure 10] (a) is a perspective view showing a state where the scaffold is rotated 180 degrees around the rotation axis and inverted up and down, and (b) is a side view. [Figure 11] It is a perspective view showing a state where the handrail is rotated and laid down and stored in the depression on the upper side of the scaffold. [Figure 12] (a) is a perspective view showing a state where the stopper is rotated outward, and (b) is a side view.

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the working machine according to the present invention will be described with reference to the drawings. In the following, the case where the working machine is a crawler crane (hereinafter simply referred to as a crane) will be described. However, the present invention is also applicable to various cranes including other mobile cranes such as wheel cranes and truck cranes. Further, the present invention is also applicable to other working machines such as hydraulic excavators and wheel loaders.

[0010] FIG. 1 is a side view of a crane as a working machine according to the present embodiment. Hereinafter, in accordance with the up, down, left, right, front, and rear directions of the crane, terms such as "up", "down", "left", "right", "front", and "rear" will be used.

[0011] As shown in FIG. 1, the crane 1 includes a crawler-type lower traveling body 2 that can travel by itself, and an upper revolving body 3 that is mounted on the lower traveling body 2 so as to be rotatable. A boom 4 is attached to the front side of the upper revolving body 3 so as to be able to rise and fall. A counterweight 5 for balancing the weight of the boom 4 and the suspended load is attached to the rear part of the upper revolving body 3.

[0012] The raising and lowering operation of the boom 4 is performed by winding and unwinding a raising and lowering rope 6 by a raising and lowering winch (not shown). The winding and unwinding of a hoisting rope 8 having a hook 7 at its tip is performed by a hoisting winch (not shown). Furthermore, the cab 9 is positioned on the front right side of the upper rotating body 3.

[0013] A scaffolding 10 is provided on the side of the crane 1. Although only the scaffolding 10 provided on the right side of the crane 1 and the upper rotating body 3 is shown in Figure 1, the scaffolding 10 may also be provided on the left side of the crane 1, etc. The scaffolding 10 is attached to the upper rotating body 3. In this embodiment, the scaffolding 10 is attached to the lower side of the upper rotating body 3 so as to extend in the front-rear direction. In addition, a handrail 11 is integrally provided with the scaffolding 10.

[0014] In this embodiment, the crane 1 corresponds to the work machine in the present invention, and the upper rotating body 3 corresponds to the main body of the work machine in the present invention. The main body refers to the part of the work machine to which the scaffolding is attached. Therefore, the term "working machine" may include parts other than the "main body," such as the lower traveling body 2 in this embodiment. However, in some working machines, the working machine may not include parts other than the main body, and the working machine itself may constitute the main body.

[0015] The scaffolding 10 of the work machine 1 according to this embodiment will be specifically described using the figures from Figure 2 onward. The scaffolding 10 is rotatably mounted between a deployed position that extends to the side of the crane 1 and a stowed position that is close to the side of the crane 1.

[0016] Figure 2 shows the scaffolding 10 in its deployed position. Note that the upper rotating body 3 is shown in a simplified form in Figure 2 and other diagrams. As shown in Figure 2, by rotating the scaffolding 10 vertically around the pivot axis A supported by the upper rotating body 3, the scaffolding 10 can be extended to the side of the crane 1.

[0017] The handrail 11 is positioned at the furthest point from the side of the upper rotating body 3 on the scaffolding 10 when deployed, and can be positioned upright from the scaffolding 10. In this embodiment, the handrail 11 has a handrail body 11A that is integrated with the scaffolding 10, and an auxiliary handrail 11B that is connected to the handrail body 11A on the side opposite to the scaffolding 10. In addition, a reinforcing plate 11C is attached to the handrail body 11A to reinforce the strength of the handrail body 11A.

[0018] In this embodiment, both the main handrail body 11A and the auxiliary handrail 11B are formed from iron pipe material. Furthermore, the auxiliary handrail 11B is formed to be slightly thinner than the main handrail portion 11A, and the end of the auxiliary handrail 11B can be inserted into the main handrail portion 11A to connect the auxiliary handrail 11B to the main handrail portion 11A.

[0019] In this embodiment, as shown in Figure 3, the height of the handrail 11 from the scaffolding 10 can be changed by changing the insertion length of the auxiliary handrail 11B into the handrail body 11A. In other words, the protruding length of the auxiliary handrail 11B from the handrail body 11A can be changed. Furthermore, the auxiliary handrail 11B can be configured to be detachable from the handrail body 11A by pulling it out from the handrail body 11A as shown in Figure 4, or by inserting it as shown in Figure 2.

[0020] Furthermore, if the reinforcing plate 11C is attached to the auxiliary handrail 11B when the auxiliary handrail 11B is pulled out from the main handrail body 11A, the auxiliary handrail 11B will become heavier by the weight of the reinforcing plate 11C, which may make it difficult to handle. As shown in Figure 4, by providing the reinforcing plate 11C on the handrail body 11A side, it is possible to make the auxiliary handrail 11B lighter.

[0021] On the other hand, as mentioned above, the scaffolding 10 can be rotated from the deployed position to the retracted position while remaining integrated with the handrail 11, and is retracted in close proximity to the side of the crane 1. In this case, for example as shown in Figure 5, it is possible to configure the scaffolding 10 to be rotated around the pivot axis A and stored while the handrail 11 remains upright from the scaffolding 10. In this case, in the stored position, the handrail 11 will be positioned above the upper rotating body 3.

[0022] With this configuration, when the scaffolding 10 is rotated, the handrail 11 automatically positions itself above the upper rotating body 3. More specifically, the handrail 11 is positioned above the greenhouse where the engine, hydraulic pump, etc., are located. In other words, since the width of the scaffolding 10 is greater than the height to the top of the greenhouse, the handrail 11 does not interfere with the greenhouse of the upper rotating body 3 when the scaffolding is rotated. Therefore, by simply rotating the scaffolding 10, it becomes possible to store the scaffolding 10 and the handrail 11 simultaneously.

[0023] Furthermore, by rotating the scaffolding 10 and unfolding it, the scaffolding 10 can be set up with the handrails 11 attached. Therefore, it becomes possible to deploy and retract the scaffolding 10 equipped with the handrail 11 without attaching or detaching the handrail 11 to the scaffolding 10, making deployment and retraction operations extremely efficient.

[0024] Furthermore, it is also possible to configure the scaffolding 10 to be rotated and folded outwards in the state shown in Figure 2, and then rotated in that state to be stored close to the side of the crane 1, as shown in Figure 6. In this case, in the storage position, the handrail 11 will be positioned above the scaffolding 10. Alternatively, the auxiliary handrail 11B may be pushed into the main handrail body 11A to lower it, as shown in Figure 3, or it may be pulled out from the main handrail body 11A, as shown in Figure 4.

[0025] With this configuration, when the scaffolding 10 is rotated, the handrail 11 also rotates simultaneously, positioning itself to the side of the upper rotating body 3. Therefore, by simply rotating the scaffolding 10, it becomes possible to store the scaffolding 10 and the handrail 11 simultaneously.

[0026] Furthermore, by rotating the scaffolding 10 to unfold it and raising the handrail 11, the scaffolding 10 can be installed with the handrail 11 attached. Therefore, it becomes possible to deploy and retract the scaffolding 10 equipped with the handrail 11 without attaching or detaching the handrail 11 to the scaffolding 10, making deployment and retraction operations extremely efficient.

[0027] On the other hand, for example, the handrail 11 can be configured to switch between an upright position, where it is erected from the scaffolding 10 in a deployed position that extends to the side of the crane 1, and a retracted position, where it is lowered towards the scaffolding 10 from the upright position. As shown in Figure 7, by storing the handrail 11 so that it lies down toward the scaffolding 10 and rotating the scaffolding 10 upward around the pivot axis A, it is possible to configure the scaffolding 10 to be stored close to the side of the crane 1.

[0028] The following will specifically describe an example of how to store the handrail 11 so that it folds down toward the scaffolding 10, as well as an example of its configuration. First, let's explain some examples of the scaffolding 10 configuration. Figure 8(a) is a perspective view showing the configuration of the scaffolding 10, and Figure 8(b) is a side view showing the state with the front frame 12, which will be described later, removed.

[0029] The scaffolding 10 is formed of a grid-like structural material such as a grating. Furthermore, the scaffolding 10 can be constructed from materials such as steel or fiber-reinforced plastic (FRP). If the scaffolding 10 is constructed from fiber-reinforced plastic, it will be lighter, making it easier to deploy and store.

[0030] Plate-shaped frames 12 are positioned at the front and rear ends of the scaffolding 10, respectively. Furthermore, each frame 12 is provided with the aforementioned pivot axis A at one end in the left-right direction.

[0031] Furthermore, each frame 12 is provided with a handrail pivot shaft 13 at its other end in the left-right direction for rotatably attaching the handrail 11 to the frame 12. Although not shown in the diagram, each frame 12 is provided with a restricting member such as a pin or latch at or near the handrail pivot axis 13. By operating the restricting member, the handrail 11 can be allowed to rotate around the handrail pivot axis 13 or its rotation can be restricted.

[0032] At the center of the scaffolding 10 in the left-right direction (i.e., the shorter side direction of the scaffolding 10), there is a rotation axis 14 of the scaffolding 10 that extends in the front-rear direction of the upper rotating body 3 (main body). Specifically, a rotating shaft 14 is provided on the inside of each frame 12 (i.e., on the side facing the scaffolding 10).

[0033] Furthermore, the scaffolding 10 is held at its front and rear ends (i.e., the parts facing each frame 12) by holding members 10A. Furthermore, a bearing 10B that receives the rotating shaft 14 is formed on the holding member 10A, and each holding member 10A is rotatably supported on each frame 12 via the rotating shaft 14.

[0034] The holding member 10A rotates around the rotation axis 14, allowing the scaffolding 10 to rotate around the rotation axis 14. Furthermore, the retaining member 10A and the bearing 10B are formed such that the rotating shaft 14 is positioned in a direction perpendicular to the planar direction of the scaffolding 10 (the vertical direction in Figure 8(b)) relative to the scaffolding 10.

[0035] The pivot axis A side of each frame 12 is connected by a connecting member 15 that extends in the front-rear direction. The connecting member 15 is positioned to engage with the left and right ends of the scaffolding 10. Therefore, when the scaffolding 10 rotates around the rotation axis 14 and its left and right ends reach the connecting member 15, it comes into contact with the connecting member 15 and cannot rotate any further.

[0036] Furthermore, when the scaffolding 10 is in the deployed position, a protruding member 3A provided on the upper rotating body 3 (not shown) comes into contact with the connecting member 15. Therefore, as mentioned above, when the scaffolding 10 rotates around the pivot axis A and moves from the storage position to the deployed position, the protruding member 3A comes into contact with the connecting member 15, preventing the scaffolding 10 from rotating further downwards, and maintaining the state in which the scaffolding 10 is deployed in the deployed position.

[0037] Each frame 12 is provided with a stopper 16 that extends in the front-rear direction and has a roughly rectangular cross-section (in this example, a part of it has a roughly U-shaped cross-section) on the side of the handrail pivot axis 13. In other words, the stopper 16 is located on the side of the scaffolding 10 that is farther away from the upper rotating body 3. On the handrail pivot axis 13 side of the stopper 16, a stopper pivot axis 16A is rotatably supported by each frame 12. Therefore, the stopper 16 can rotate around the stopper pivot axis 16A (i.e., around an axis extending in the front-rear direction).

[0038] Furthermore, by positioning the stopper 16 on the side of the scaffolding 10 that is farther from the upper slewing body 3, as described above, workers will no longer need to crawl under the scaffolding 10 to the back, that is, the side closer to the crane 1 and the upper slewing body 3, in order to rotate the stopper 16, making the work easier. Although not shown in the diagram, similar to the handrail 11 described above, the stopper 16 is provided with a restricting member such as a pin or latch on or near the stopper pivot axis 16A, and by operating the restricting member, the stopper 16 can be made to rotate around the stopper pivot axis 16A or its rotation can be restricted.

[0039] Furthermore, when the stopper 16 is rotated around the stopper pivot axis 16A and positioned so that its tip faces the rotation axis 14 of the scaffolding 10, as shown in Figure 8(b), it is possible to prevent the scaffolding 10 from rotating around the rotation axis 14. Furthermore, as will be described later, when the stopper 16 is rotated around the stopper pivot axis 16A, the stopper 16 is released, allowing the scaffolding 10 to rotate around the rotation axis 14 (see Figure 9(b) described later).

[0040] Next, we will describe an example of how to store the handrail 11 so that it collapses toward the scaffolding 10 of the above structure. As shown in Figures 2 and 8(a) and (b), with the scaffolding 10 extended out to the side of the crane 1, the auxiliary handrail 11B is pushed into the handrail body 11A to lower it, as shown in Figure 3. In other words, the length of the auxiliary handrail 11B protruding from the handrail body 11A is shortened. Alternatively, as shown in Figure 4, the auxiliary handrail 11B may be pulled out from the handrail body 11A.

[0041] Next, as shown in Figures 9(a) and (b), when the stopper 16 is rotated downward around the stopper pivot axis 16A to release the stopper 16, the scaffolding 10 becomes capable of rotating around the rotation axis 14, as shown in Figure 9(b). Next, the scaffolding 10 is rotated 180 degrees around the rotation axis 14. In other words, the scaffolding 10 is rotated and inverted.

[0042] As mentioned above, the rotation axis 14 is positioned in a direction that is perpendicular to the plane direction of the scaffolding 10. Therefore, when the scaffolding 10 rotates 180 degrees around the rotation axis 14, it changes position from the high position shown in Figures 8(a) and (b) to the low position shown in Figures 10(a) and (b).

[0043] In other words, if we consider the higher position of the scaffolding 10 shown in Figures 8(a) and 8(b) as the first position, and the lower position of the scaffolding 10 shown in Figures 10(a) and 10(b) as the second position, then in this example, the scaffolding 10 is configured to change position between the first position and the second position, which is lower in the height direction (in this case, vertical direction) of the upper rotating body 3 than the first position, while in an deployed position. The first position is a position in which workers can walk on the upper side of the scaffolding 10 when it is in that position, and the second position is a position in which, as will be described later, a recess is created on the upper side of the scaffolding 10, and the handrail 11 can be stored there.

[0044] In this example, the scaffolding 10 is configured to change between the first and second positions by rotating it around the rotation axis 14. In other words, the scaffolding 10 is configured to switch between the first and second positions by rotating it around the rotation axis 14. When the position of the scaffolding 10 changes to a second position that is lower than the first position, a recess is formed on the upper side of the scaffolding 10, surrounded by the frame 12 and connecting members 15, as shown in Figures 10(a) and (b).

[0045] Next, with the scaffolding 10 in the second position, the handrail 11 is rotated around the handrail pivot axis 13 and lowered, and stored in the recess on the upper side of the scaffolding 10 as shown in Figure 11. In the above example, the scaffolding 10 is rotated around the pivot axis 14 to change its position from the first position to a lower second position, thereby creating a recess on the upper side of the scaffolding 10, into which the handrail 11 is stored.

[0046] With this configuration, it becomes possible to switch the handrail 11 to the storage position while the scaffolding 10 is in the second position. Therefore, the handrail 11 can be compactly stored by tilting it towards the scaffolding 10.

[0047] In this case, the auxiliary handrail 11B may be configured to be pushed into the main handrail body 11A to lower the height of the handrail 11, as shown in Figure 3, or the auxiliary handrail 11B may be pulled out from the main handrail body 11A, as shown in Figure 4. With this configuration, even if the vertical length of the handrail 11 is longer than the horizontal width of the scaffolding 10 (i.e., the handrail 11 is tall), it is possible to shorten the vertical length of the handrail 11 and securely store the handrail 11 in the recess on the upper side of the scaffolding 10.

[0048] Next, as shown in Figures 12(a) and (b), the stopper 16 is rotated outward around the stopper pivot axis 16A, that is, toward the handrail pivot axis 13. When the stopper 16 is rotated in this manner, even if one attempts to rotate the handrail 11 around the handrail pivot axis 13 from the state shown in Figures 12(a) and (b) to raise it upright relative to the scaffolding 10, the stopper 16 gets in the way and prevents it from being raised upright.

[0049] Therefore, as shown in Figures 12(a) and (b), the retracted handrail 11 remains in a state of being bent over toward the scaffolding 10, preventing the handrail 11 from unexpectedly standing up toward the scaffolding 10 during storage or deployment operations, thus enabling stable work. Furthermore, by rotating the stopper 16 outward around the stopper pivot axis 16A in this manner, the stopper 16 is prevented from protruding below the frame 12.

[0050] Next, as shown in Figures 12(a) and (b), the scaffolding 10 with the handrail 11 stored inside is rotated upward around the pivot axis A, making it possible to store the scaffolding 10 in close proximity to the side of the crane 1, as shown in Figure 7. In this case, if the stopper 16 does not protrude below the frame 12 in the deployed position as described above, then when the scaffolding 10 is stored, the stopper 16 will not protrude from the scaffolding 10 in the left-right direction, making it possible to store the scaffolding 10 compactly.

[0051] Furthermore, by performing the above operations in reverse, the scaffolding 10, which is stored in a storage position close to the side of the crane 1, can be rotated and extended out to the side of the crane 1. Then, at the deployed position, it becomes possible to erect the handrail 11 from the scaffolding 10.

[0052] In this process, the auxiliary handrail 11B is extended from the main handrail body 11A, as shown in Figure 2, to increase the length of the auxiliary handrail 11B protruding from the main handrail body 11A. As described above, in the example, the auxiliary handrail 11B is configured such that when the scaffolding 10 is in the deployed position, the protruding length from the handrail body 11A is increased, and when the scaffolding 10 is in the retracted position, the protruding length from the handrail body 11A is shortened.

[0053] As described above, according to the work machine (crane 1) of this embodiment, the scaffolding 10 can be rotated in an integrated state with the handrail 11 to extend out to the side of the work machine, or the scaffolding 10 can be rotated to bring it close to the side of the work machine for storage. Therefore, it becomes unnecessary to remove the handrails 11 from the scaffolding 10 when transporting work machinery, or to attach the handrails 11 to the scaffolding 10 during work, making it possible to efficiently deploy and store the scaffolding 10 equipped with handrails 11.

[0054] In the above embodiment, the scaffolding 10 is configured to change position between a first position and a second position which is lower in the height direction of the upper rotating body 3 than the first position, while the scaffolding 10 is in an extended position. However, there are other configurations as well, for example, in which the scaffolding 10 can be moved in a parallel vertical direction from the first position to the second position.

[0055] Furthermore, in the above embodiment, a case was described in which the scaffolding 10 is moved from the first position to the second position, and the handrail 11 is lowered toward the scaffolding 10 in the second position and stored on the upper side of the scaffolding 10. However, there are other configurations as well. For example, while the scaffolding 10 remains in the first position, the handrail 11 can be rotated in the opposite direction to the above (i.e., rotated counterclockwise from the state shown in Figure 10(b)) and stored in the recess on the underside of the scaffolding 10. With this configuration, the work of changing the position of the scaffolding 10 from the first position to the second position becomes unnecessary.

[0056] On the other hand, the above embodiment describes the case in which the scaffolding 10 in the deployed position is rotated upward around the pivot axis A (i.e., the scaffolding 10 is rotated so that the side of the scaffolding 10 with the handrail 11 on the opposite side of the pivot axis A moves upward) and stored in close proximity to the side of the crane 1 (working machine). However, it is also possible to configure the scaffolding 10, which is in the deployed position, to be rotated downward (i.e., rotated so that the side opposite to the pivot axis A of the scaffolding 10 moves downward) and stored in close proximity to the side of the crane 1 (working machine). In this case, the scaffolding 10 may be rotated downward with the handrail 11 stored in the recess of the scaffolding 10 as described above, or the handrail 11 may be lowered to the underside of the scaffolding 10 that has been rotated downward.

[0057] Furthermore, it goes without saying that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. [Explanation of Symbols]

[0058] 1. Crane (working machine) 3. Upper rotating body (main body) 10 Scaffolding 11 Handrail 11A Handrail main body 11B Assistive handrail 14 Rotation axis 16 Stopper

Claims

1. The main body of the work machine, A scaffolding attached to the main body and provided on the side of the work machine, A handrail provided integrally with the aforementioned scaffolding, Equipped with, The scaffolding is mounted so as to be rotatable around a pivot axis between an extended position that extends to the side of the work machine and a retracted position that is close to the side of the work machine. The scaffolding is designed to be stored in the storage position in an integrated state with the handrail. The handrail is switchable between an upright position, where it is erected from the scaffolding in the deployed position, and a retracted position, where it is folded down toward the scaffolding from the upright position. The scaffolding is configured to change position between a first position and a second position which is lower in the height direction of the main body than the first position, while in the deployed position which is maintained so as not to rotate further at the pivot end around the pivot axis. Agricultural machinery.

2. The handrail is switchable between an upright position, where it is erected from the scaffolding in the deployed position, and a retracted position, where it is folded down toward the scaffolding from the upright position. The handrail is switchable to the storage position when the scaffolding is in the second position. The work machine according to claim 1.

3. The scaffolding extends in the front-rear direction of the main body and is configured to be switchable between the first position and the second position by rotating around an axis located offset from the center of the scaffolding in a direction perpendicular to the surface of the scaffolding. The work machine according to claim 1 or claim 2.

4. A stopper is provided that can prevent the rotation of the scaffolding. The work machine according to claim 3.

5. The stopper is positioned on the side of the scaffolding that is furthest from the main body. The work machine according to claim 4.

6. The handrail comprises a handrail body connected to the scaffolding, and an auxiliary handrail attached to the handrail body so as to be displaceable in the vertical direction at the erected position. A working machine according to any one of claims 2 to 5.

7. The auxiliary handrail has a longer protruding length from the handrail body when the scaffolding is in the deployed position, and a shorter protruding length from the handrail body when the scaffolding is in the retracted position. The work machine according to claim 6.

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