Work machine

Abstract

To provide a work machine which can easily enter a scaffold that is blocked by a door.SOLUTION: A work machine is equipped with a main body on which work is performed, a scaffold provided on the side of the main body, and a handrail provided on the scaffold. The handrail includes a handrail main body (31) that a pedestrian can hold to support himself / herself, and a door (35) that allows access to the scaffold. The door (35) opens by rotating from a closed state toward the scaffold.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a working machine.

Background Art

[0002] Patent Document 1 shows a sliding door provided near the saddle (scaffold) of an overhead crane.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the sliding door as described above, it is necessary to slide the door by hand to open the door, which is troublesome when passing through. On the other hand, if the door is not provided and it is always possible to enter and exit, there will be no handrail at that part.

[0005] An object of the present invention is to provide a working machine that can block the entrance and exit to the scaffold with a door and is easier to enter the scaffold.

Means for Solving the Problems

[0006] The working machine according to the present invention includes a main body part that performs work, a scaffold provided on a side part of the main body part, a handrail provided on the scaffold, and the handrail includes a handrail main body that can support a pedestrian by grasping it and a door that enables entry to the scaffold. The door opens by rotating from a closed state to the scaffold side.

Effects of the Invention

[0007] According to the present invention, it is possible to provide a work machine that can block the entrance and exit to the scaffold with a door and that enables easier entry into the scaffold.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0009] Hereinafter, each embodiment of the present invention will be described in detail with reference to the drawings.

[0010] (Embodiment 1) FIG. 1 is a perspective view showing a working machine according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing the main body side part (A) during the operation of the working machine of FIG. 1 and the main body side part (B) during transportation. In FIGS. 1 and 2, the scaffolding 20 and the handrail 30 are shown only on the right side of the main body part 10, but the scaffolding and the handrail are similarly provided on the left side of the main body part 10.

[0011] The working machine 1 according to Embodiment 1 of the present invention is a self-propelled crane, and more specifically, a crawler crane. The working machine 1 includes a main body part 10 driven to perform work, a scaffolding 20 provided on the side of the main body part 10, and a handrail 30 provided on the scaffolding 20.

[0012] The main body part 10 includes, for example, a lower traveling body 11 capable of traveling, an upper slewing body 12 rotatably supported by the lower traveling body 11, and a boom 13 provided on the upper slewing body 12 so as to be able to rise and fall. On the upper slewing body 12, a mast 15 connected to the boom 13 via a pendant member 14, winches 16a to 16c for winding and unwinding wire ropes W1 to W3, an operation room (also referred to as a cab) 17 operated by an operator, and a counterweight 18 which is a weight for balancing the load of the suspended load are provided. The scaffolding 20 is provided, for example, on the side of the upper slewing body 12 and functions as a walking path leading to the entrance and exit of the operation room 17.

[0013] Note that the scaffolding 20 may be configured to be arranged at various locations, for example, provided on the side of the ceiling part of the upper slewing body 12.

[0014] The handrail 30 is provided standing on the side edge of the working machine 1 so as to surround the side of the scaffold 20. The handrail 30 includes a handrail main body 31 that can support the body when grasped by an operator (i.e., a pedestrian within the scaffold 20), a side door 35 that enables entry into the scaffold 20, and front and rear doors 37. The side door 35 is a door located on the side of the scaffold 20 (the side when facing the front within the operation room 17). The front and rear doors are doors located on the front side and the rear side of the scaffold 20 (the front and the rear with respect to the scaffold 20 in a state of facing the front within the operation room 17). Hereinafter, the side door 35 and the front and rear doors 37 are also collectively referred to as doors 35, 37.

[0015] Figure 3 is a diagram for explaining the opening and closing structure of the side door. (A) is a perspective view of the side door in an open state, and (B) is a perspective view of the side door in a closed state. Figure 4 is a diagram showing the hinge structure portion of Figure 3. (A) is a plan view of the location of the first hinge member seen from above, and (B) is a plan view of the location of the third member seen from above. Figure 5 is a diagram for explaining the opening and closing structure of the front and rear doors. (A) is a perspective view of the front and rear doors in a closed state, and (B) is a perspective view of the front and rear doors in an open state.

[0016] As shown in FIGS. 3 and 5, the doors 35, 37 are configured to open by rotating from the closed state toward the scaffold side. The scaffold side means the inner side of the scaffold 20 with respect to the edge of the scaffold 20, or the side approaching the side portion of the main body portion 10. With this configuration, an operator entering the scaffold 20 can easily enter the scaffold 20 with less effort because the doors 35, 37 open as the operator's body moves. For example, even if the operator's hands are occupied, the operator can easily open the doors 35, 37 and enter the scaffold 20.

[0017] As shown in FIGS. 3 and 5, the doors 35, 37 include first biasing portions 351, 371 that bias the doors 35, 37 in a direction opposite to the opening direction of the doors 35, 37, and rotation prevention portions 352, 372 that prevent the doors 35, 37 from rotating in the opposite direction to the scaffold side from the closed state. The opposite side to the scaffold side means the opposite side of the scaffold side. With this configuration, even if an operator who has entered the scaffold 20 leans against the closed doors 35, 37, the doors 35, 37 can support the operator and keep the operator in the scaffold 20.

[0018] As shown in FIGS. 3 and 4, the side door 35 further includes a restraint portion 353 that restricts the rotation angle of the side door 35. The restraint portion 353 restricts the rotation angle when the side door 35 is opened. More specifically, the restraint portion 353 restricts both the rotation angle in the opening direction of the side door 35 and the rotation angle in the reverse direction (the rotation angle in the direction opposite to the opening direction of the side door 35) in a state where the rotation prevention portion 352 is removed. With this configuration, if the side door 35 rotates unrestrictedly toward the scaffold side, when the rotating end of the side door 35 comes into contact with the main body portion 10 of the working machine 1, an operator, or some object, the restraint portion 353 can suppress the rotation and prevent the above contact.

[0019] The restraint portion 353 is configured to restrict both the rotation in the opening direction and the rotation in the closing direction of the side door 35. Among this configuration, by restricting the rotation angle in the opening direction, it is possible to prevent the rotating end of the side door 35 described above from coming into contact with something. Also, by restricting the rotation angle in the closing direction, when disassembling the handrail main body 31 and the side door 35 for transportation, or when assembling the handrail main body 31 and the side door 35 into the working state after transportation, even if the locking of the above rotation prevention portion 352 is released and a period occurs during which the side door 35 rotates toward the non-scaffold side due to the action of the first biasing portion 351, the rotation can be restricted to an intermediate angle. The restriction of the rotation in the closing direction is performed at an angle rotated toward the non-scaffold side from the angle at which the side door 35 is closed. Therefore, the workability when disassembling or assembling the handrail main body 31 and the side door 35 into the working state can be improved.

[0020] <Specific structural example of the side door 35> Subsequently, with reference to FIGS. 3 and 4, a specific structural example of the side door 35 will be described. However, the following structural example is just an example, and the structure for realizing the action of the side door 35 described above is not limited to the following structural example, and various modifications are possible.

[0021] The side door 35 has a frame 35F extending along the four sides of a rectangle, and the upper side portion of the frame 35F is located at substantially the same height as the upper side portion of the handrail main body 31. The rotation prevention portion 352 is a plate-like member fixed so as to protrude toward the rotation side on the rotation side of the side door 35. The rotation side means the side far from the rotation center. When the side door 35 is at the closed angle, the rotation prevention portion 352 abuts against the support column 312 adjacent to the side door 35 in the handrail main body 31, thereby preventing the side door 35 from rotating toward the counter support side. Note that the prevention of rotation toward the counter support side is not limited to a configuration in which rotation from the closed angle to the counter support side is completely impossible, but is a concept including a configuration in which rotation toward the counter support side is such that a person cannot pass through from the closed angle.

[0022] The side door 35 includes a first hinge member 354 and a second hinge member 355 connected to the support column 311 of the handrail main body 31 on the rotation center side, and a third hinge member 356 connected to the frame 35F on the rotation center side. The first hinge member 354 and the second hinge member 355 are plate-shaped and extend in the horizontal direction, and a space N1 is opened under the first hinge member 354 and the second hinge member 355 is positioned in parallel. The third hinge member 356 is plate-shaped and extends in the horizontal direction, and is supported from below by the second hinge member 355 in the space N1. The side door 35 includes a rotation support shaft 357. The rotation support shaft 357 is passed through the through hole of the third hinge member 356, the upper part is supported by the first hinge member 354, and the lower part is supported by the second hinge member 355. Due to this structure, the third hinge member 356 is made rotatable with respect to the first hinge member 354 and the second hinge member 355. The rotatable structural portion is hereinafter referred to as the "hinge structural portion".

[0023] The hinge structure portion of the side door 35 is further provided with a first biasing portion 351. The first biasing portion 351 is a spring wound around the rotation support shaft 357, with a part locked to the third hinge member 356 and the other part locked to the first hinge member 354. The first hinge member 354 is provided with a plurality of locking portions (specifically, locking holes) 3541 to 3543 capable of locking the other end of the first biasing portion 351. By locking the other end to any of the locking portions 3541 to 3543, the rotational force exerted by the first biasing portion 351 on the side door 35 can be adjusted. This adjustment may be performed at the manufacturing stage of the handrail 30 or by the user after the handrail 30 is shipped.

[0024] The hinge structure portion of the side door 35 is further provided with a restraint portion 353. The restraint portion 353 is, for example, a pin fixed to the first hinge member 354 and the second hinge member 355. The third hinge member 356 has a first protrusion 3561 and a second protrusion 3562 that contact the restraint portion 353 at a predetermined rotation angle. The first protrusion 3561 contacts the restraint portion 353 at a predetermined angle (for example, a position rotated 80 degrees from the closed angle) with respect to the rotation of the side door 35 toward the scaffold side, restraining further rotation. The second protrusion 3562 contacts the restraint portion 353 at a predetermined angle with respect to the rotation toward the non-scaffold side when the locking of the rotation prevention portion 352 is disengaged during disassembly of the handrail 30 or the like, restraining further rotation.

[0025] The hinge structure portion of the side door 35 is similarly provided in two stages on the upper half stage and the lower half stage of the frame 35F.

[0026] With the above structure, the operation of the side door 35 described above is achieved.

[0027] <Specific Structural Example of the Front and Rear Door 37> Subsequently, with reference to FIG. 5, a specific structural example of the front and rear door 37 will be described. However, the following structural example is just an example, and the structure for realizing the operation of the front and rear door 37 described above is not limited to the following structural example, and various modifications are possible.

[0028] The front and rear doors 37 have a frame 37F extending along the four sides of a rectangle, and the upper side portion of the frame 37F is positioned at substantially the same height as the upper side portion of the handrail main body 31.

[0029] In the front and rear doors 37, the first biasing portion 371 and the rotation prevention portion 372 are provided in the hinge structure portion. The front and rear doors 37 include, at the hinge structure portion on the rotation center side, a first hinge member 375 and a second hinge member 376 connected to the support column 313 of the handrail main body 31, a third hinge member 377 connected to the frame 37F, and a rotation support shaft 378. The first hinge member 375 and the second hinge member 376 are plate-shaped and extend in the horizontal direction, with a space N2 opened below the first hinge member 375 and the second hinge member 376 positioned in parallel. The third hinge member 377 is plate-shaped and extends in the horizontal direction, and is supported from below by the second hinge member 376 in the space N2. The rotation support shaft 378 is passed through a through hole of the third hinge member 377, with the upper portion supported by the first hinge member 375 and the lower portion supported by the second hinge member 376. With this structure, the third hinge member 377 is made rotatable with respect to the first hinge member 375 and the second hinge member 376.

[0030] The hinge structure portion of the front and rear doors 37 is further provided with a first biasing portion 371. The first biasing portion 371 is a spring wound around the rotation support shaft 378, with a part locked to the third hinge member 377 and the other part locked to the first hinge member 375. The first hinge member 375 is provided with a plurality of locking portions (specifically, locking holes) 3751 to 3753 capable of locking the other end of the first biasing portion 371. By locking the other end to any of the locking portions 3751 to 3753, the rotational force exerted by the first biasing portion 371 on the front and rear doors 37 can be adjusted. This adjustment may be performed at the manufacturing stage of the handrail 30 or by the user after the product shipment of the handrail 30.

[0031] The hinge structure portion of the front and rear door 37 is further provided with a rotation prevention portion 372. The rotation prevention portion 372 is, for example, a shaft portion fixed to the first hinge member 375 and the second hinge member 376. The third hinge member 377 has a protrusion 3771 (see FIG. 5(B)) that abuts against the rotation prevention portion 372 at the angle when the front and rear door 37 is closed, thereby preventing the front and rear door 37 from rotating toward the counter scaffold side.

[0032] The hinge structure portion of the front and rear door 37 is provided in two stages on the upper half step and the lower half step of the frame 37F. With the above structure, the operation of the front and rear door 37 described above is achieved.

[0033] The hinge structure portion of the front and rear door 37 is further provided with a fixing structure portion 374 (see FIGS. 5(A) and 5(B)). The fixing structure portion 374 is used to fix the handrail 30 in the folded state during the transportation of the working machine 1. The fixing structure portion 374 has through holes 3741 to 3743 that are connected in a straight line and a pin 3744 that can be inserted into the through holes 3741 to 3743 when the front and rear door 37 is rotated until it overlaps the handrail main body 31 on the scaffold side. The through holes 3741 to 3743 are provided in the first hinge member 375, the third hinge member 377, and the second hinge member 376, respectively. The pin 3744 is removably fixed to a bracket connected to the support column 313 of the handrail main body 31 or the like. With the above configuration, the fixing structure portion 374 can fix the front and rear door 37 in the state where it is folded onto the handrail main body 31 during the transportation of the working machine 1.

[0034] The fixing structure portion 374 may be provided only on one of the two-stage hinge structure portions, for example.

[0035] <Folding Structure of Scaffold 20 and Handrail 30> As shown in FIG. 2(B), the scaffold 20 and the handrail 30 can be stored so as to be close to the side surface of the main body portion 10 (the side surface of the upper swing body 12) during the transportation of the working machine 1. The position when stored is called the storage position.

[0036] The scaffold 20 has a plate shape that extends horizontally in the working state and is configured to be rotatable about the main body 10 side in the standing direction. As shown in FIGS. 2(A) to 2(B), by rotating the scaffold 20 to stand up and locking a part of it to the main body 10 by pin joining or the like, the scaffold 20 can be fixed in the stored position.

[0037] The handrail 30 can be fixed in the stored position by once separating it from the scaffold 20 and then locking the lower end and the middle part to the scaffold 20 in the stored position by pin joining or the like. As shown in FIGS. 2(A) and 2(B), when the connection with the scaffold 20 is released, the handrail 30 is separated into a first unit 301, a second unit 302, a third unit 303, and a fourth unit 304. The first unit 301 corresponds to the rear front and rear door 37, the rear part 315 of the handrail main body 31, and the part of the rear side door 35. The second unit 302 corresponds to the middle part 316 of the handrail main body 31 and the part of the middle side door 35. The third unit 303 corresponds to the front side door 35 and the part of its support column 311. The fourth unit 304 corresponds to the front part 317 of the handrail main body 31 and the part of the front front and rear door 37.

[0038] In the working state, the first unit 301 to the fourth unit 304 of the handrail 30 are arranged in the order. On the other hand, in the stored state, the first unit 301 to the fourth unit 304 of the handrail 30 are arranged so as to be arranged in an order different from the order. That is, they are arranged like the first unit 301, the second unit 302, the fourth unit 304, and the third unit 303.

[0039] If the handrail 30 is put into the stored state without changing the order, due to the overlap with the doors 35, 37 and the handrail main body 31, the handrail 30 in the stored position may cause a relatively large protrusion in the width direction of the main body 10 of the working machine 1. In such a case, by changing the order and putting the handrail 30 into the stored state as in this embodiment, the above protrusion can be eliminated.

[0040] In this embodiment, in order to store the front and rear doors 37 in a folded state in the opened direction, a protrusion occurs at the overlapping portion between the front front and rear door 37 and the handrail body 31. If the order is not changed, this portion will interfere with the frame of the operation room 17. However, by changing the order as described above, the above interference can be avoided, and the handrail 30 can be made into a compact storage posture. When the width of the main body portion 10 of the working machine 1 is close to the transport limit width, the ability to store the handrail 30 in a compact posture is particularly useful. The transport limit width means the maximum width defined by the regulations regarding the transport of the working machine 1.

[0041] (Embodiment 2) FIG. 6 is a view showing the side door of the working machine according to Embodiment 2 of the present invention. (A) is a perspective view showing the state where the side door is closed, and (B) is a perspective view showing the state where the side door is opened. FIG. 7 is a view for explaining the hinge structure of the side door of Embodiment 2. (A) is a perspective view in a state where the locking pin is removed, and (B) is a plan view seen from above. FIG. 8 is a plan view showing the details of the locking portion of the side door of Embodiment 2. FIG. 9 is a view for explaining the storage structure of the side door of Embodiment 2. (A) shows the second stage during storage, and (B) shows the third stage during storage. FIG. 10 is a view showing the place where the handrail of Embodiment 2 is removed from the scaffold.

[0042] The working machine according to Embodiment 2 is different in the connection structure between the handrail 30 and the scaffold 20 and the handrail 30, and the rest is substantially the same as in Embodiment 1. Hereinafter, the different configurations will be described in detail.

[0043] The handrail 30 is provided standing on the edge on the outer peripheral side of the working machine 1 so as to surround the scaffold 20. The handrail 30 includes a handrail main body 31 that can support the body when grasped by a worker (i.e., a pedestrian in the scaffold 20), and a door 39 that enables entry into the scaffold 20. The door 39 is a side door located on the side of the scaffold 20, and may be referred to as the side door 39 hereinafter. The handrail 30 may be provided with front and rear doors in the same manner as the side door 39. The front and rear doors are doors located on the front side and the rear side of the scaffold 20.

[0044] As shown in Fig. 6, the door 39 is configured to open by rotating from the closed state toward the scaffold side. The scaffold side is as described above. With this configuration, since the door 39 opens as the worker entering the scaffold 20 moves his body, the worker can easily enter the scaffold 20 with little effort. For example, even if the worker's hands are occupied, he can easily open the door 39 and enter the scaffold 20.

[0045] As shown in Fig. 7, the door 39 includes a first biasing portion 391 that biases the door 39 in a direction opposite to the opening direction, and a rotation prevention portion 392 that prevents the door 39 from rotating from the closed state toward the non-scaffold side. The non-scaffold side is as described above. With this configuration, even if the worker who has entered the scaffold 20 leans against the closed door 39, the door 39 can support the worker and keep the worker on the scaffold 20.

[0046] The rotation prevention portion 392 has a locking portion 3921 provided on the door 39 and a locked portion 3922 (for example, a support column of the adjacent handrail main body 31) provided outside the door 39 to which the locking portion 3921 is locked. When the locking portion 3921 is locked to the locked portion 3922 with the door 39 in the closed state, the rotation of the door 39 toward the non-scaffold side is prevented.

[0047] As shown in Figs. 7(A) and 8, the rotation prevention portion 392 further includes a locking avoidance portion 3923 that avoids the locking portion 3921 from being locked to the locked portion 3922. When the locking is avoided by the locking avoidance portion 3923, the door 39 can rotate toward the non-scaffold side. The rotation toward the non-scaffold side can be used when releasing the biasing force of the first biasing portion 391.

[0048] The locking avoidance part 3923 includes a mechanism 3924 that can displace the locking part 3921, and a second biasing part 3925 that biases the locking part 3921 to a position where it can be locked with the locked part 3922. More specifically, the mechanism 3924 is a mechanism that can displace the locking part 3921 between a position where it can be locked with the locked part 3922 and a position where the locking can be avoided. The second biasing part 3925 biases the locking part 3921 from the position where the locking can be avoided toward the position where the locking is possible. By the second biasing part 3925, the locking part 3921 can be maintained at the position where it is locked with the locked part 3922 unless a force is applied to displace the locking part 3921. On the other hand, by applying a force against the biasing force of the second biasing part 3925 to displace the locking part 3921, the locking part 3921 can be retracted toward the rotation center side, thereby avoiding the locking with the locked part 3922.

[0049] As shown in FIG. 6(A), the door 39 includes a receiving part 393 that receives the reaction force of the first biasing part 391. As shown in FIG. 7(A), the receiving part 393 is detachable from the door 39. By removing the receiving part 393, the biasing of the first biasing part 391 is released, and the door 39 can be rotated to a state where it overlaps with the handrail main body 31 (specifically, the handrail main body 31 on the side adjacent to the rotation center of the door 39).

[0050] Furthermore, as shown in FIG. 9(B), the receiving part 393 is configured to be attachable to the door 39 again when the door 39 overlaps with the handrail main body 31. And when it is attached to the door 39 again, the rotation of the door 39 is configured to be fixable.

[0051] According to the above-described locking avoidance portion 3923 and the receiving portion 393, by following the next procedure, an operator can change the handrail 30 from the working state to a transport posture that is easy to transport. That is, first, as shown in FIGS. 7(A) and 7(B), the locking avoidance portion 3923 avoids the locking between the locking portion 3921 and the locked portion 3922, and the operator rotates the door 39 toward the counter scaffold side. Then, the biasing force of the first biasing portion 391 is released, the force applied to the receiving portion 393 is released, and the receiving portion 393 becomes removable. Therefore, the operator removes the receiving portion 393. Next, as shown in FIGS. 9(A) and 9(B), the door 39 with the biasing force released is rotated until it overlaps with the handrail main body 31. Subsequently, by the operator attaching the receiving portion 393 again, the door is fixed in a state of overlapping with the handrail main body 31, and the handrail 30 can be set to the transport posture.

[0052] Further, to change the handrail 30 from the above-described transport posture to the form during work, the operator can transition from the transport posture to the working state by following a procedure opposite to the above-described procedure.

[0053] <Specific Structural Example of Door 39> Subsequently, a specific structural example of the door 39 will be described. However, the following structural example is just an example, and the structure for realizing the above-described operation is not limited to the following structural example, and various modifications are possible.

[0054] The door 39 has a frame 39F extending along four sides of a rectangle, and the upper side portion of the frame 39F is positioned at substantially the same height as the upper side portion of the handrail main body 31.

[0055] The locking piece 3921 of the rotation prevention portion 392 is a locking piece provided so as to protrude toward the rotation side on the rotation side of the frame 39F. The locked portion 3922 is a part of the frame 31F of the adjacent handrail main body 31. A cushioning material (such as rubber) is provided at a location where the locking portion 3921 contacts the locked portion 3922.

[0056] As the mechanism 3924 that can displace the locking part 3921, for example, a hinge mechanism that can rotate the locking part 3921 around a rotation axis extending in the vertical direction can be adopted. The hinge mechanism has a limit position of the rotatable angle of the locking part 3921, and the limit position is a rotatable angle at which the locking part 3921 can be locked to the locked part 3922. As the second biasing part 3925, a spring material (such as a leaf spring) supported by the support shaft of the mechanism 3924 can be adopted. In this case, by bringing a part of the spring material into contact with the locking part 3921 and bringing the other part of the spring material into contact with the frame 39F, the above-mentioned biasing force can be added.

[0057] The door 39 is connected to the adjacent handrail main body 31 so as to be rotatable via a hinge structure part. The hinge structure part includes a base member 394 connected to the frame 31F of the handrail main body 31, a first hinge member 395 and a second hinge member 396 provided on the base member 394, and a third hinge member 397 and a fourth hinge member 398 connected to the frame 39F. The first hinge member 395 to the fourth hinge member 398 are plate-shaped and extend in the horizontal direction. A space N3 is opened between the first hinge member 395 and the second hinge member 396, and between the third hinge member 397 and the fourth hinge member 398, and they are located parallel to each other. The third hinge member 397 and the fourth hinge member 398 are arranged so as to be vertically aligned with a slight clearance from the first hinge member 395 and the second hinge member 396, and one combination of hinge members sandwiches the other combination of hinge members. Further, a rotation support shaft 399 passes through the first hinge member 395 to the fourth hinge member 398, and the third hinge member 397 and the fourth hinge member 398 are rotatable around the rotation support shaft 399. The rotation support shaft 399 has widened portions at one end and the other end, and is configured not to come out of the first hinge member 395 to the fourth hinge member 398.

[0058] The first biasing portion 391 and the receiving portion 393 that receives the reaction force of the first biasing portion 391 are provided in the hinge structure portion described above. The first biasing portion 391 is a spring wound around the rotation support shaft 399, a part of which is locked to the base member 394 and the other part is locked to the receiving portion 393. With this structure, the door 39 is biased in the direction of closing from the scaffold side. The receiving portion 393 is a pin passed through the through holes of the third hinge member 397 and the fourth hinge member 398. The through holes are provided at positions that do not overlap with the first hinge member 395 and the second hinge member 396 within the rotation range of the door 39 in the working state. The receiving portion 393, which is a pin, has a widened upper end portion and is configured not to fall out of the above through hole. The receiving portion 393, which is a pin, has a fitting that can be detachably attached to the lower end portion, and is configured not to be pulled out from the through hole when there is a fitting, and can be configured to be pulled out from the through hole by removing the fitting. The first hinge member 395 to the fourth hinge member 398 have through holes 395h to 398h through which the receiving portion 393, which is a pin, can pass in a state where the door 39 is in the transport posture (the state of being folded over the handrail main body 31). By passing the receiving portion 393 through here, the door 39 can be fixed in the transport posture. The through holes 397h and 398h also serve as holes for fixing the receiving portion 393, which is a pin, in the working state.

[0059] <Detachable Structure of Handrail 30> The scaffold 20 has a mounting portion 21 to which the handrail 30 can be mounted. Specifically, the mounting portion 21 is a tubular body into which the rod body of the lower portion 33 of the handrail 30 fits, but any structure may be used as long as the lower portion 33 of the handrail 30 can be fixed. The mounting portion 21 is configured such that a bolt can be fastened so that the mounted handrail 30 does not come off.

[0060] In the working machine of the second embodiment, the handrail 30 is removed from the scaffold 20 and transported together with the main body portion of the working machine. Note that the handrail 30 of the second embodiment may also be adopted to be locked to the erected scaffold 20 and transported together with the protective body portion of the working machine, similar to the first embodiment.

[0061] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. For example, in the above embodiments, the scaffold 20 and its handrails 30, 30 at approximately the same height as the entrance of the operation room 17 are shown. However, for example, the scaffold and its handrails may be arranged at various locations such as on the main body of the working machine. In the above embodiments, a crawler crane is described as an example of the working machine. However, the working machine is applicable not only to other mobile cranes such as wheel cranes, truck cranes, rough terrain cranes, all terrain cranes, etc., but also to all cranes such as tower cranes, ceiling cranes, jib cranes, retractable cranes, stacker cranes, gantry cranes, unloaders, etc. Further, the working machine is not limited to cranes and is applicable to various working machines such as power shovels. Also, the details shown in the embodiments can be appropriately changed without departing from the gist of the invention.

Explanation of Signs

[0062] 1 Working machine 10 Main body part 11 Lower traveling body 12 Upper slewing body 20 Scaffold 30 Handrail 31 Handrail main body 35 Side door 37 Front and rear door 39 Door 301 First unit 302 Second unit 303 Third unit 304 Fourth unit 311, 312 Support column 351, 371, 391 First biasing part 352, 372, 392 Rotation prevention part 353 Restraint part 3561 First protrusion 3562 Second protrusion 374 Fixed structure part 3741~3743 Through hole 3744 Pin 3923 Locking avoidance part 3924 Displaceable mechanism 3925 Second biasing portion 393 Receiving portion 395h~398h Through holes

Claims

1. A main body that is driven, A scaffold provided on the side of the main body, A handrail provided on the scaffold, Comprising, The handrail includes a handrail main body that can support a pedestrian by grasping it, and a door that enables entry to the scaffold, The door opens by rotating from the closed state toward the scaffold side, A working machine.

2. A first biasing portion that biases in a direction opposite to the direction in which the door opens, A rotation prevention portion that prevents the door from rotating from the closed state toward the side opposite to the scaffold, Further comprising, The working machine according to Claim 1.

3. The rotation prevention portion has a locking portion provided on the door and a locked portion provided outside the door to which the locking portion is locked, When the locking portion is locked to the locked portion with the door closed, rotation of the door toward the side opposite to the scaffold is prevented, Furthermore, it is provided with a locking avoidance portion that avoids the locking portion from being locked to the locked portion, When the locking is avoided by the locking avoidance portion, rotation of the door toward the side opposite to the scaffold becomes possible, The working machine according to Claim 2.

4. The locking avoidance portion is, A mechanism that can displace the locking portion between a position where it can be locked to the locked portion and a position where the locking can be avoided, A second biasing portion that biases the locking portion from the position where the locking can be avoided toward the position where it can be locked to the locked portion, Comprising, The working machine according to Claim 3.

5. Further comprising a receiving portion that is removable and receives the reaction force of the first biasing portion, By removing the receiving portion and releasing the biasing of the first biasing portion, the door can rotate to a state where it overlaps with the handrail main body, By attaching the receiving portion in the overlapping state, the receiving portion can fix the rotation of the door, The working machine according to Claim 2.

6. Further comprising a restraining portion that restricts the rotation angle of the door, The working machine according to Claim 1.

7. A first biasing portion that biases in a direction opposite to the direction in which the door opens, A rotation prevention portion that prevents the door from rotating from the closed state toward the side opposite to the scaffold, Further comprising, The restraining portion restricts both the rotation angle of the door in the opening direction and the rotation angle in the direction opposite to the opening direction with the rotation prevention portion removed, The working machine according to Claim 6.

8. The door includes a side door provided on the side of the scaffold and a front - rear door provided in front of or behind the scaffold, The working machine according to Claim 1.

9. A plurality of the doors, One or a plurality of the handrail main bodies, Comprising, The one or more handrail bodies and the plurality of doors can be rearranged to a storage position. At least one pair of the one or more handrail bodies and the plurality of doors has a different order during operation and an order at the storage position. The working machine according to claim 1.

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