JP7613294B2 - Construction machinery scaffolding structure - Google Patents

Description

The present invention relates to a scaffolding structure for construction machinery.

Construction machinery such as cranes and hydraulic excavators are provided with scaffolding members for boarding, disembarking, and walking. The scaffolding members are usually installed so that they protrude outward from the sides of the frame (swivel frame) of the upper rotating body on the lower running body.

Construction machinery is loaded onto transport vehicles such as trucks and trailers and transported to construction sites. The width of the load that can be transported by a transport vehicle is limited by the Road Act, so if the construction machinery is loaded onto the transport vehicle with the scaffolding members attached, there is a risk that the load width limit will be exceeded. Therefore, in the past, scaffolding structures for construction machinery that allow scaffolding members to be easily attached and detached have been proposed (for example, see Patent Document 1 below).

In the scaffolding structure described in Patent Document 1, the scaffolding member is lifted and placed on a support bracket attached to a revolving frame, and the locking pin is slid forward and backward to insert into the locking holes of both brackets, thereby attaching the scaffolding member to the revolving frame. Conversely, when removing the scaffolding member, the locking pin is slid to remove it from the locking hole, and the scaffolding member is lifted up to remove it from the revolving frame. In the above scaffolding structure, when transporting construction machinery, the scaffolding member is removed so that it fits within the load width limit of the transport vehicle.

JP 2020-165196 A

However, in the scaffolding structure described in Patent Document 1, when installing the scaffolding member, the worker must support the scaffolding member with his/her hands until the lock pin is inserted into the lock hole, which places a large burden on the worker. In addition, if an excessive load acts on the lock pin and the lock pin is deformed, it may become impossible to slide the lock pin, and the scaffolding member may not be removable.

The present invention was made in consideration of these points, and its purpose is to provide a scaffolding structure for construction machinery that allows easy attachment and detachment of scaffolding members and that does not risk becoming unable to remove the scaffolding members even if excessive load is applied.

The first invention is a scaffolding structure for a construction machine, comprising a side portion extending in the fore-and-aft direction of the frame of an upper rotating body of the construction machine, and a scaffolding member provided to protrude outward from the side portion of the frame, the scaffolding structure comprising a scaffolding bracket extending outward from the side portion of the frame and to which the scaffolding member is fixed, and a support bracket attached to the side portion of the frame and supporting a base end portion of the scaffolding bracket, the base end portion of the scaffolding bracket having a first upper engagement portion and a first lower engagement portion, the support bracket having a second upper engagement portion that engages with the first upper engagement portion and a second lower engagement portion that engages with the first lower engagement portion, one of the first and second upper engagement portions being an upper shaft portion extending in the fore-and-aft direction, and the other being an upper recess into which the upper shaft portion fits, When the upper engagement part is hooked from above onto the second upper engagement part, the upper shaft part fits into the upper recess, so that the scaffolding bracket is in an upper engagement state in which it is supported on the support bracket so as to be rotatable about the axis of the upper shaft part, and the first and second lower engagement parts are configured such that when the first and second upper engagement parts are in the upper engagement state, the scaffolding bracket is rotated about the axis of the upper shaft part in a first direction in which the tip of the scaffolding bracket descends, so that the first lower engagement part abuts against the second lower engagement part at a position where the scaffolding member protrudes outward from the side of the frame, resulting in a lower engagement state in which the rotation of the scaffolding bracket in the first direction and the upward movement are restricted.

In the first invention, the first upper engagement part of the base end of the scaffolding bracket and the second upper engagement part of the support bracket are configured with an upper shaft part extending in the front-rear direction on one side and an upper recess into which the upper shaft part fits on the other side, and are configured so that when the first upper engagement part is hooked onto the second upper engagement part from above, the upper shaft part fits into the upper recess, thereby bringing the scaffolding bracket into an upper engagement state in which it is rotatably supported by the support bracket. Also, in the first invention, when the first and second upper engagement parts are in the upper engagement state, the first lower engagement part of the base end of the scaffolding bracket and the second lower engagement part of the support bracket are configured to come into contact with each other when the scaffolding bracket is rotated in a first direction in which the tip of the scaffolding bracket descends, bringing the scaffolding bracket into a lower engagement state that restricts the rotation in the first direction and the upward movement of the scaffolding bracket.

With this configuration, the first invention makes it easy to attach and detach scaffolding members.

Specifically, when attaching a scaffolding member to the side of the frame (support bracket), a worker lifts the scaffolding member and hooks the first upper engagement part of the base end of the scaffolding bracket onto the second upper engagement part of the support bracket, causing the first and second upper engagement parts to enter an upper engagement state, and the scaffolding bracket is rotatably supported by the support bracket. Then, in this state, simply rotating the scaffolding bracket in the first direction in which the tip of the scaffolding bracket descends causes the first and second lower engagement parts to come into contact, resulting in a lower engagement state in which rotation in the first direction and upward movement of the scaffolding bracket are restricted.

In other words, in the first invention, after the first and second upper engagement parts are engaged, the worker can perform the installation work without supporting the load of the scaffolding member and the scaffolding bracket, so the burden on the worker during the installation work of the scaffolding member can be reduced. Similarly, in the installation and removal work of the scaffolding member, the worker can perform the installation and removal work without supporting the load of the scaffolding member and the scaffolding bracket until the upper engagement state of the first and second upper engagement parts is released (the disengagement work of the first and second lower engagement parts), so the burden on the worker during the installation and removal work of the scaffolding member can also be reduced. Therefore, according to the first invention, the installation and removal work of the scaffolding member can be easily performed.

In addition, the first direction in which the scaffold bracket is rotated during installation is a direction that does not go against gravity acting on the tip of the scaffold bracket. Therefore, installation work of a scaffolding member that rotates the scaffold bracket in the first direction can reduce the burden on the worker compared to the installation and removal work of a scaffolding member that rotates the scaffold bracket in the second direction against gravity. Conversely, due to the action of gravity, the scaffolding bracket is configured to be difficult to rotate in the second direction. Therefore, even if a force acts on the scaffolding bracket to rotate in the second direction due to machine vibration or the like when the scaffolding member is installed in an installation state in which the scaffolding member is attached to the side of the frame, it will not rotate in the second direction even with a small force, and the scaffolding member will not fall off the side of the frame.

In the first invention, the first upper engagement part is hooked from above onto the second upper engagement part, and the first and second upper engagement parts are in an upper engagement state in which the upper shaft part fits into the upper recess, thereby rotatably supporting the scaffolding bracket on the support bracket. When the scaffolding bracket is rotated in this state, the first and second lower engagement parts are in a lower engagement state, restricting the rotation of the scaffolding bracket in the first direction and the upward movement. With this configuration, in the first invention, when the scaffolding member is attached to the side of the frame, even if the scaffolding member is subjected to vertical vibrations, the upward movement of the scaffolding bracket is restricted, so the upper engagement state of the first and second upper engagement parts is not released, and there is no risk of the scaffolding member falling off the side of the frame.

In addition, in the first invention, the load of the scaffolding members and scaffolding brackets is applied to the second upper engagement portion of the support bracket attached to the side of the frame. In other words, unlike conventional scaffolding structures, in the first invention, the load of the scaffolding members and scaffolding brackets is supported by fixed members rather than movable members (conventionally lock pins that slide). Therefore, according to the first invention, it is possible to provide a scaffolding structure for construction machinery that does not risk the scaffolding members becoming unable to be removed even when an excessive load is applied.

The second invention is the first invention, which is provided with a locking mechanism that restricts the rotation of the scaffold bracket in a second direction opposite to the first direction when the first and second upper engagement parts are in the upper engagement state and the first and second lower engagement parts are in the lower engagement state.

In the second invention, when the scaffolding member is attached to the side of the frame, even if a force acts on the scaffolding member to rotate the scaffolding bracket in the second direction, the rotation of the scaffolding bracket in the second direction is restricted, so the lower engagement state of the first and second lower engagement parts is not released. Also, because the lower engagement state of the first and second lower engagement parts is not released, even if vertical vibration acts on the scaffolding member, the upward movement of the scaffolding bracket is restricted, and the upper engagement state of the first and second upper engagement parts is not released, so there is no risk of the scaffolding member falling off the side of the frame.

The third invention is the second invention, in which the locking mechanism has a locking member that is attached to the scaffolding bracket and is separate from the upper shaft portion, which restricts the rotation of the scaffolding bracket in the second direction by abutting against the side of the frame.

In the third invention, the locking member attached to the scaffolding bracket abuts against the side of the frame, restricting the rotation of the scaffolding bracket in the second direction and preventing the scaffolding member from falling off the side of the frame. Therefore, according to the third invention, a locking mechanism that prevents the scaffolding member from falling off can be easily configured by simply providing a locking member on the scaffolding bracket.

In addition, in the third invention, the locking member is constructed as a separate member from the upper shaft portion on which the loads of the scaffolding member and the scaffolding bracket act. In other words, in the third invention, unlike conventional scaffolding structures, the loads of the scaffolding member and the scaffolding bracket do not act on the locking member, so the locking member is not deformed by the load of the scaffolding member and the locking function is not impaired.

The fourth invention is the third invention, in which the locking member is configured to be movable between a locked position in which it abuts against the side of the frame to restrict the rotation of the scaffolding bracket in the second direction, and an unlocked position in which it allows the rotation of the scaffolding bracket in the second direction.

In the fourth invention, the scaffolding member can be easily prevented from falling off simply by moving the locking member attached to the scaffolding bracket from the locked position to the unlocked position. In addition, the locking member is configured to be movable and is a separate member from the upper shaft portion. Therefore, when the locking member is moved, the load of the scaffolding member and the scaffolding bracket is not applied to the locking member, making the movement work easy.

The fifth invention is the third or fourth invention, in which the locking member is configured to restrict the rotation of the scaffolding bracket in the second direction by abutting at least a portion of the locking member against the side of the frame at a position above the axis of the upper shaft portion.

In the fifth invention, when the first and second upper engagement parts are in the upper engagement state and the first and second lower engagement parts are in the lower engagement state, at least a part of the locking member is configured to abut against the side of the frame at a position above the axis of the upper shaft part that serves as the pivot axis of the scaffolding bracket. With this configuration, when the scaffolding member is attached in a state in which the first and second upper engagement parts and the first and second lower engagement parts are both in an engaged state (upper engagement state and lower engagement state), it is possible to reliably prevent the scaffolding bracket from rotating in the second direction and releasing the lower engagement state of the first and second lower engagement parts. This makes it possible to reliably prevent the scaffolding member from falling off.

The sixth invention is any one of the first to fifth inventions, in which the first upper engagement portion is configured by the upper recess that opens downward, and the second upper engagement portion is configured by the upper shaft portion.

In the sixth invention, the first upper engagement part, which is formed into a hook shape by an upper recess that opens downward, is hooked from above onto the second upper engagement part, which is made of an upper shaft that extends in the front-rear direction, so that the first and second upper engagement parts can be easily brought into an upper engagement state.

The seventh invention is the sixth invention, in which the upper recess is formed in an inverted U-shape such that the lower end of the side of the frame is located below the axis of the upper shaft when the first and second upper engagement parts are in the upper engagement state.

In the seventh invention, the upper recess is formed deep enough that the upper shaft fits inside up to the shaft center. Therefore, even if the scaffolding member and the scaffolding bracket rotate slightly in the second direction due to sudden shaking or the like, the hook-shaped first upper engagement portion (upper recess) does not come off the second upper engagement portion (upper shaft), and the upper engagement state in which the first upper engagement portion is hooked onto the second upper engagement portion can be maintained. Therefore, according to the seventh invention, it is possible to more reliably prevent the scaffolding member from falling off.

The eighth invention is any one of the first to seventh inventions, in which the side of the frame is formed in a cylindrical shape so as to form an internal space extending in the front-to-rear direction, an opening is formed in the side of the frame through which the base end of the scaffolding bracket can be inserted, and the support bracket is disposed inside the frame.

In the eighth invention, the side of the frame is formed into a cylindrical shape, and a support bracket is provided in the internal space. The base end of the scaffolding bracket is inserted into the frame through an opening formed in the side of the frame and engaged with the support bracket, so that the scaffolding bracket is supported by the support bracket, and the scaffolding member is attached so that it protrudes outward from the side of the frame.

In this way, in the eighth invention, the support bracket is disposed inside the frame, so when the scaffolding member is removed from the side of the frame, the support bracket does not protrude from the side of the frame. This allows the vehicle width of the upper rotating body to be within the cargo width limit of the transport vehicle.

However, in the eighth invention, the base end of the scaffolding bracket must be inserted from the opening into the inside of the cylindrical side part, and the base end of the scaffolding bracket and the support bracket must be engaged inside, making it difficult to visually observe the engaged portion. However, as described above, the scaffolding structure of the present application is configured so that the base end of the scaffolding bracket can be easily engaged with the support bracket by simply hooking the first upper engagement part onto the second upper engagement part from above and rotating the scaffolding bracket in the first direction according to gravity, and the engagement state between the base end of the scaffolding bracket and the support bracket can be easily released by the reverse operation. Therefore, even if the structure is such that the base end of the scaffolding bracket and the support bracket are engaged inside the side part of the frame, the work of attaching and detaching the scaffolding members can be easily performed.

The present invention provides a scaffolding structure for construction machinery that allows easy attachment and detachment of scaffolding members and eliminates the risk of the scaffolding members becoming unable to be removed even when an excessive load is applied.

FIG. 1 is a side view showing the overall configuration of a construction machine according to a first embodiment. FIG. 2 is a perspective view showing the overall configuration of the construction machine according to the first embodiment. FIG. 3 is a perspective view showing the scaffold member removed from the rotating frame. FIG. 4 is a plan view showing the scaffolding member removed from the swivel frame. FIG. 5 is a perspective view showing the configuration of the scaffolding bracket. FIG. 6 is a rear view of the scaffolding structure, where (a) shows the state before the scaffolding members are attached to the rotating frame, and (b) shows the state after the scaffolding members have been attached to the rotating frame. FIG. 7 is a perspective view of the scaffolding structure, in which (a) shows the state before the scaffolding members are attached to the rotating frame, and (b) shows the state after the scaffolding members are attached to the rotating frame. FIG. 8A illustrates the operation of attaching a scaffold member to a rotating frame. FIG. 8B illustrates the operation of attaching the scaffold member to the rotating frame. Figure 9 is a rear view of the scaffolding structure of embodiment 2, where (a) shows the state before the scaffolding members are attached to the swivel frame, and (b) shows the state after the scaffolding members are attached to the swivel frame. Figure 10 is a rear view of the scaffolding structure of embodiment 3, where (a) shows the state before the scaffolding members are attached to the swivel frame, and (b) shows the state after the scaffolding members are attached to the swivel frame. Figure 11 is a plan view of a scaffolding structure relating to embodiment 3, where (a) shows the state before the scaffolding members are attached to the swivel frame, and (b) shows the state after the scaffolding members are attached to the swivel frame. Figure 12 is a rear view of the scaffolding structure of embodiment 4, where (a) shows the state before the scaffolding members are attached to the swivel frame, and (b) shows the state after the scaffolding members are attached to the swivel frame.

The following describes an embodiment of the present invention with reference to the drawings. Note that the following description of the preferred embodiment is essentially merely an example, and is not intended to limit the present invention, its applications, or its uses. In each figure, arrows indicate up/down, front/back, left/right directions. Unless otherwise specified, up/down and other directions will be described according to the directions indicated by these arrows.

First Embodiment of the Invention
First, the configuration of a construction machine 10 equipped with a scaffolding structure 100 according to the present invention will be described with reference to FIGS. 1 to 7. FIG.

[Construction machinery]
As shown in FIGS. 1 and 2, a construction machine 10 includes a crawler-type undercarriage 1 and an upper rotating body 2 rotatably mounted on the undercarriage 1.

The upper rotating body 2 is equipped with a rotating frame (frame) 3 as a vehicle body frame, an attachment 4 attached to the front end of the rotating frame 3 for excavating soil and sand, a cab 5, a machine room 6, and a counterweight 7 attached to the rear end of the rotating frame 3 for balancing the weight of the attachment 4.

The attachment 4 comprises a boom 11 whose base end is rotatably attached to the rotating frame 3, an arm 12 rotatably attached to the tip end of the boom 11, and a bucket 13 rotatably attached to the tip end of the arm 12.

The cab 5 is a driver's room equipped with a driver's seat, various control devices, operating devices, etc. The cab 5 is disposed on the front left side of the upper rotating body 2 so as to be adjacent to the left side of the attachment 4.

The machine room 6 is provided at the rear of the upper rotating body 2, spanning both the left and right sides. A counterweight 7 is provided at the rear of the machine room 6. A hydraulic oil tank 15 for storing hydraulic oil is provided at the front left part of the machine room 6. A fuel tank 16 for storing fuel is provided at the front right part of the machine room 6.

A safety fence 17 is installed above the machine room 6 and the counterweight 7 to ensure the safety of workers standing on the machine room 6 and the counterweight 7. In addition, a handrail 18 is installed on the right front side of the rotating frame 3 to assist workers in getting on and off.

[Configuration of scaffold structure]
The construction machine 10 is provided with a scaffolding structure 100 for detachably attaching the scaffolding members 20 to the rotating frame 3. In the present embodiment 1, the scaffolding structure 100 is provided on the left side of the construction machine 10.

The scaffolding structure 100 comprises a scaffolding member 20, a side portion 30 of a revolving frame 3, a scaffolding bracket 40, and a support bracket 50.

As shown in Figures 3 and 4, the scaffolding member 20 is a rectangular plate-like member that is long in the front-rear direction. The scaffolding member 20 is made of, for example, steel. As shown in Figure 2, in this embodiment 1, four scaffolding members 20 are provided on the left side 30 of the rotating frame 3 so as to be lined up in the front-rear direction of the vehicle. The scaffolding members 20 are detachably attached to the side 30 of the rotating frame 3 via a scaffolding bracket 40 and a support bracket 50.

As shown in Figures 4, 6, and 7, the side portion 30 of the revolving frame 3 has a side plate member 31 and a cover member 32. The side plate member 31 is a rectangular plate member that is long in the front-rear direction and is erected so as to extend vertically. The cover member 32 is a U-shaped plate member that is long in the front-rear direction with its upper and lower ends bent toward the inside of the vehicle (to the right in Figure 3), and is provided outside the side plate member 31. The side portion 30 of the revolving frame 3 is formed into a cylindrical shape so that the side plate member 31 and the cover member 32 form an internal space 35 that extends in the front-rear direction.

A number of openings 33 are formed at intervals in the front-rear direction on the outer surface of the side 30 of the revolving frame 3 (the outer surface of the cover member 32). The number of openings 33 is equal to the number of scaffolding brackets 40 described below (eight in this embodiment 1). The openings 33 are formed in a position and size that allows the base end of the scaffolding bracket 40 (the end on the side 30 side of the revolving frame 3) to be inserted therethrough. The openings 33 are formed in a rectangular shape extending in the vertical direction.

In addition, multiple support brackets 50 are provided at intervals in the front-rear direction in the internal space 35 of the side portion 30 of the revolving frame 3. The number of support brackets 50 provided is equal to the number of scaffolding brackets 40 (described later) (eight in this embodiment 1).

As shown in FIG. 3, two scaffolding brackets 40 (a pair) are provided on each scaffolding member 20. The pair of scaffolding brackets 40, 40 are fixed to the front and rear ends of the scaffolding member 20. The pair of scaffolding brackets 40, 40 are formed in a front-to-back inverted shape.

As shown in Figures 4 to 7, the scaffolding bracket 40 has a vertical plate member 41 that extends outward from the vehicle (to the left in Figures 6 and 7) and stands upright in the vertical direction, and a horizontal plate member 42 that is fixed to one side of the vertical plate member 41, has a horizontal upper surface that extends outward from the vehicle, and supports the scaffolding member 20. The scaffolding bracket 40 is made of, for example, steel.

The vertical plate member 41 has a base end 43 provided on the rotating frame 3 side, and a support portion 44 extending from the base end 43 to the outside of the vehicle. The base end 43 is made of a plate-shaped piece that is wider (longer vertically) than the support portion 44. The support portion 44 is made of a rectangular plate-shaped piece that is narrower (shorter vertically) than the base end 43 and longer in the left-right direction. The base end 43 and the support portion 44 are integrally formed.

The base end 43 has an upper engagement portion (first upper engagement portion) 70 formed at the top and a lower engagement portion (first lower engagement portion) 75 formed at the bottom. The base end 43 also has an insertion hole (not shown) through which a fixing pin 62 that rotatably attaches a locking member 61 of a locking mechanism 60 (described later) is inserted, and two insertion holes (lock hole 64, unlock hole 65) through which a locking pin 63 that restricts the rotation of the locking member 61 is inserted.

The upper engagement portion 70 is formed by a recess 71 that is formed on the upper portion of the base end portion 43 and opens downward. The recess 71 is formed in an inverted U-shape by opening downward. The recess 71 is formed to a size that fits the upper shaft portion 52 that constitutes the upper engagement portion 80 of the support bracket 50 described later. Also, as shown in FIG. 6(b), the recess 71 is formed so that the lower end 71a on the side portion 30 side of the rotating frame 3 is located below the axis X of the upper shaft portion 52 in the upper engagement state in which the upper engagement portions 70, 80 are engaged (the upper shaft portion 52 fits into the recess 71, thereby supporting the scaffolding bracket 40 rotatably on the support bracket 50).

The lower engagement portion 75 is constituted by an L-shaped abutment portion 76 formed at the lower end of the base end portion 43. The abutment portion 76 is formed in an L-shape with a vertical portion 76a extending in the up-down direction and a horizontal portion 76b extending from the lower end of the vertical portion 76a toward the vehicle side. The abutment portion 76 is formed in a shape such that when the upper engagement portions 70, 80 are in the upper engagement state and the scaffolding member 20 is in a horizontal position (a position in which the upper surface is a horizontal plane), both the vertical portion 76a and the horizontal portion 76b abut against the lower shaft portion 53 constituting the lower engagement portion 85 of the support bracket 50 described later. As shown in FIG. 6(b), the abutment portion 76 is formed so that in a lower engagement state where the lower engagement portions 75, 85 are engaged (where both the vertical portion 76a and the horizontal portion 76b are in contact with the lower shaft portion 53), the vehicle side end of the horizontal portion 76b (the right end in FIG. 6(b)) is positioned closer to the vehicle than the axis Y of the lower shaft portion 53.

The support portion 44 has multiple (four in this embodiment) insertion holes (not shown) spaced apart in the left-right direction. A bolt 47 for fixing the horizontal plate member 42 to the support portion 44 is inserted into each insertion hole.

The horizontal plate member 42 is composed of a plate-like member bent into an L-shape. The horizontal plate member 42 is formed in an L-shape with a short side portion 42a extending outward from the vehicle along the support portion 44 of the vertical plate member 41, and a long side portion 42b extending from the upper end of the short side portion 42a in a direction away from the vertical plate member 41. In a pair of scaffolding brackets 40, 40 to which the scaffolding member 20 is fixed, the horizontal plate member 42 is fixed to the opposing surfaces of the support portions 44 of the vertical plate members 41 (the rear side surface of the front scaffolding bracket 40, and the front side surface of the rear scaffolding bracket 40).

The short side 42a of the horizontal plate member 42 has multiple (four in this embodiment) insertion holes (not shown) spaced apart in the left-right direction. A bolt 47 for fixing the horizontal plate member 42 to the support portion 44 is inserted into each insertion hole.

Multiple (four in this embodiment) insertion holes 42c are formed in the long side portion 42b of the horizontal plate member 42. A bolt 48 is inserted into each insertion hole 42c to secure the scaffolding member 20 to the long side portion 42b of the horizontal plate member 42.

The support bracket 50 includes a pair of plate-like members 51, 51 spaced apart in the front-rear direction, and two shafts 52, 53 extending in the front-rear direction. The pair of plate-like members 51, 51 are provided inside the cylindrical side portion 30 of the revolving frame 3, and are provided parallel to each other so as to face each other across the opening 33 (at positions in front and behind the opening 33). The two shafts 52, 53 are made of cylindrical members and span the pair of plate-like members 51, 51. As described above, the pair of plate-like members 51, 51 are provided in front and behind the opening 33, so that the two shafts 52, 53 spanned by the pair of plate-like members 51, 51 are positioned in a position visible from the opening 33 of the side portion 30 of the revolving frame 3. In addition, the lower shaft 53 of the two shafts 52, 53 is provided so as to be located closer to the inside of the vehicle than the upper shaft 52 in the left-right direction.

In this embodiment 1, the upper shaft portion 52 constitutes a second upper engagement portion 80 that engages with the first upper engagement portion 70 (in this embodiment 1, the recess 71) of the scaffolding bracket 40. On the other hand, the lower shaft portion 53 constitutes a second lower engagement portion 85 that engages with the first lower engagement portion 75 (in this embodiment 1, the abutment portion 76) of the scaffolding bracket 40.

Thus, in the scaffolding structure 100, the base end 43 of the scaffolding bracket 40 and the support bracket 50 each have upper engagement portions 70, 80 and lower engagement portions 75, 85. The scaffolding structure 100 is configured such that, after the upper engagement portions 70, 80 are in the upper engagement state, when the scaffolding bracket 40 is rotated around the axis X of the upper shaft portion 52 in a first direction (counterclockwise in FIG. 6) in which the tip of the scaffolding bracket 40 descends, the lower engagement portions 75, 85 are in the lower engagement state, and the scaffolding member 20 is in an attached state in which it protrudes outward from the side portion 30 of the revolving frame 3. In addition, the scaffolding structure 100 is configured such that, when the scaffolding bracket 40 is rotated around the axis X of the upper shaft portion 52 in a second direction (clockwise in FIG. 6) in which the tip of the scaffolding bracket 40 rises, the lower engagement state of the lower engagement portions 75, 85 is released when the scaffolding member 20 is attached. In other words, the scaffolding structure 100 is configured such that, when the scaffolding member 20 is attached, the upper engagement state of the upper engagement portions 70, 80 cannot be released unless the lower engagement state of the lower engagement portions 75, 85 is released.

In this embodiment 1, the scaffolding structure 100 is provided with a locking mechanism 60 that restricts the rotation of the scaffolding bracket 40 in the second direction in order to reliably prevent the scaffolding member 20 from falling off when the scaffolding member 20 is attached (the upper engagement parts 70, 80 are in the upper engagement state and the lower engagement parts 75, 85 are in the lower engagement state).

The locking mechanism 60 includes a locking member 61, a fixing pin 62, and a locking pin 63.

The locking member 61 is made of a long, thin plate-like piece, and has a through hole (not shown) formed at the base end (one end) through which the fixing pin 62 is inserted. The locking member 61 is rotatably attached to the base end 43 of the scaffolding bracket 40 by the fixing pin 62 inserted through the through hole and a through hole (not shown) formed in the base end 43 of the scaffolding bracket 40.

The locking member 61 also has an insertion hole 61a formed in the middle of its length, through which the locking pin 63 is inserted. The locking member 61 is held by the locking pin 63 inserted into the insertion hole 61a in a locked position where the tip of the locking member 61 abuts against the side portion 30 of the rotating frame 3 to restrict the scaffolding bracket 40 from rotating in the second direction, and in an unlocked position where the scaffolding bracket 40 is allowed to rotate in the second direction.

The locking member 61 is configured such that, in the locked position, at least a portion of the tip abuts against the outer surface of the cover member 32 of the side portion 30 of the revolving frame 3 at a position above the axis X of the upper shaft portion 52 of the support bracket 50. Specifically, in the locked position, the locking member 61 abuts against a lateral portion of the upper end of the opening 33 on the outer surface of the cover member 32.

The fixing pin 62 is inserted into an insertion hole (not shown) formed in the base end 43 of the scaffold bracket 40 and the locking member 61, thereby rotatably attaching the locking member 61 to the base end 43 of the scaffold bracket 40.

The lock pin 63 is composed of a bent pin with a rectangular plate-shaped small piece rotatably attached to the tip. The small piece at the tip is formed so that the long side length is longer than the diameter of the insertion holes 61a, 64, 65 formed in the base end 43 of the scaffold bracket 40 and the locking member 61, and the short side length is shorter than the diameter of the insertion holes 61a, 64, 65. With this configuration, when the small piece at the tip is rotated to a vertical state in which the longitudinal direction intersects with the axial direction of the lock pin 63 while the lock pin 63 is inserted into the insertion holes 61a, 64, 65, the lock pin 63 cannot be pulled out of the insertion holes 61a, 64, 65. Conversely, when the small piece at the tip is rotated to a horizontal state in which the longitudinal direction coincides with the axial direction of the lock pin 63, the lock pin 63 can be pulled out of the insertion holes 61a, 64, 65.

When the locking member 61 is rotated to a position (locked position) where the insertion hole 61a overlaps with the locking hole 64 and the locking pin 63 is inserted through the locking hole 64 and the insertion hole 61a, the locking member 61 is held in the locked position. When the locking member 61 is rotated to a position (unlocked position) where the insertion hole 61a overlaps with the unlocking hole 65 and the locking pin 63 is inserted through the unlocking hole 65 and the insertion hole 61a, the locking member 61 is held in the unlocked position.

[Attachment and detachment of scaffolding members]
Next, the mounting and detaching operations of the scaffolding member 20 will be described with reference to FIGS. 8A and 8B.

(Installation operation)
In the above-mentioned scaffolding structure 100, in the mounting operation, the lower engaging parts 75, 85 can be engaged after the upper engaging parts 70, 80 are engaged, but the lower engaging parts 75, 85 cannot be engaged first and the upper engaging parts 70, 80 cannot be engaged later. Therefore, in the mounting operation, first, as shown in Fig. 8A(a)-(c) and Fig. 8B(d), the upper engaging part 70 of the scaffolding bracket 40 to which the scaffolding member 20 is attached is engaged with the upper engaging part 80 of the support bracket 50. The engagement operation of the upper engaging parts 70, 80 is performed in a state in which the locking member 61 of the locking mechanism 60 is fixed in the unlocked position.

Specifically, the base end 43 of the scaffolding bracket 40 is inserted into the side portion 30 of the revolving frame 3 through the opening 33 of the support bracket 50 (FIGS. 8A(a) and (b)). Then, the scaffolding bracket 40 is tilted so that the tip is positioned higher than the base end 43 (FIG. 8A(c)), and the upper engagement portion 70 (U-shaped recess 71) of the scaffolding bracket 40 is hooked from above onto the upper engagement portion 80 (upper shaft portion 52) of the support bracket 50 (FIG. 8B(d)).

By the above operation, the upper engagement parts 70, 80 are in an upper engagement state in which the upper shaft part 52 fits into the recess 71, and the scaffolding bracket 40 is supported by the support bracket 50 so as to be rotatable around the axis X of the upper shaft part 52.

After the upper engagement parts 70, 80 of the scaffolding bracket 40 and the support bracket 50 are placed in the upper engagement state, the lower engagement parts 75, 85 are placed in the lower engagement state as shown in Figures 9B (d) to (f).

Specifically, the scaffolding bracket 40, which is tilted so that the tip is positioned above the base end 43, is rotated around the axis X of the upper shaft 52 in a first direction in which the tip of the scaffolding bracket 40 descends. When the support portion 44 of the scaffolding bracket 40 is rotated to a position in which it extends horizontally (a position in which the upper surface of the scaffolding member 20 is a horizontal plane), the lower engagement portion 75 of the scaffolding bracket 40 (the vertical portion 76a and the horizontal portion 76b of the L-shaped abutment portion 76) abuts against the lower engagement portion 85 (the lower shaft portion 53) of the support bracket 50 (FIG. 8B(e)).

By the above operation, the vertical portion 76a and horizontal portion 76b of the abutment portion 76 abut against the lower shaft portion 53, and the lower engagement portion 75, 85 enters a lower engagement state in which the rotation of the scaffold bracket 40 in the first direction and the upward movement are restricted.

As described above, by engaging the upper engagement parts 70, 80 and the lower engagement parts 75, 85 in that order (putting them into an upper engagement state and then a lower engagement state), the scaffolding member 20 can be attached to the side part 30 of the swivel frame 3. In this embodiment 1, in order to prevent the scaffolding member 20 from falling off, a locking operation is further performed, and the locking mechanism 60 restricts the rotation of the scaffolding bracket 40 in the second direction.

Specifically, the lock pin 63 inserted through the insertion hole 61a of the lock member 61 and the unlock hole 65 of the scaffold bracket 40 is pulled out, and the lock member 61 is rotated to a position where the insertion hole 61a and the lock hole 64 overlap. Then, the lock pin 63 is inserted through the insertion hole 61a of the lock member 61 and the lock hole 64 of the scaffold bracket 40, thereby fixing the lock member 61 to a lock position where its tip abuts against the outer surface of the cover member 32 of the side portion 30 of the swivel frame 3 (FIG. 9B(f)). This restricts the rotation of the scaffold bracket 40 in the second direction, with the lock member 61 acting as a support.

(Detachment operation)
The attachment and detachment operation is performed in the reverse order to the installation operation. In the above-described scaffolding structure 100, the upper engagement state of the upper engagement parts 70, 80 cannot be released until the lower engagement state of the lower engagement parts 75, 85 is released. Therefore, in the attachment and detachment operation, first, the locking member 61 of the locking mechanism 60 is fixed to the unlock position, and the lower engagement state of the lower engagement parts 75, 85 is released.

Specifically, the lock pin 63 inserted through the insertion hole 61a of the locking member 61 and the lock hole 64 of the scaffolding bracket 40 is pulled out, and the locking member 61 is rotated to a position where the insertion hole 61a and the unlock hole 65 overlap. Then, the lock pin 63 is inserted through the insertion hole 61a of the locking member 61 and the unlock hole 65 of the scaffolding bracket 40 (Fig. 8B (f)-(e)). Then, the scaffolding bracket 40 is rotated around the axis X of the upper shaft portion 52 in the second direction in which the tip portion rises (Fig. 8B (d)). As a result, the abutment portion 76 no longer abuts against the lower shaft portion 53, and the lower engagement state of the lower engagement portions 75, 85 is released.

After releasing the lower engagement state of the lower engagement parts 75, 85 of the scaffold bracket 40 and the support bracket 50, release the upper engagement state of the upper engagement parts 70, 80 as shown in Figures 8B(d) to 8A(a).

Specifically, the scaffolding bracket 40, which is tilted so that its tip is positioned higher than its base end 43, is lifted upward and moved away from the upper engagement portion 80 (upper shaft portion 52) of the support bracket 50 (Fig. 8A (c)-(a)). As a result, the base end 43 (recess 71) of the scaffolding bracket 40 is no longer rotatably supported by the support bracket 50 (upper shaft portion 52), and the upper engagement state of the upper engagement portions 70, 80 is released.

As described above, the scaffolding member 20 can be removed from the side portion 30 of the rotating frame 3 by releasing the engagement state (upper engagement state, lower engagement state) of the upper engagement portions 70, 80 and then the lower engagement portions 75, 85 in that order.

--Effects of the First Embodiment--
In the scaffolding structure 100 of the present embodiment 1, the upper engagement portion 70 of the base end portion 43 of the scaffolding bracket 40 and the upper engagement portion 80 of the support bracket 50 are configured to have an upper shaft portion 52 extending in the front-rear direction on one side and a recessed portion 71 into which the upper shaft portion 52 fits on the other side, and are configured so that when the upper engagement portion 70 is hooked onto the upper engagement portion 80 from above, the upper shaft portion 52 fits into the recessed portion 71, thereby bringing the scaffolding bracket 40 into an upper engagement state in which it is rotatably supported by the support bracket 50. Also, in the present embodiment 1, the lower engagement portion 75 of the base end portion 43 of the scaffolding bracket 40 and the lower engagement portion 85 of the support bracket 50 are configured to come into contact with each other and to bring into a lower engagement state that restricts the rotation of the scaffolding bracket 40 in the first direction and the upward movement of the scaffolding bracket 40 when the upper engagement portions 70, 80 are in the upper engagement state and the scaffolding bracket 40 is rotated in a first direction in which the tip of the scaffolding bracket 40 descends. Therefore, according to the scaffolding structure 100 of this embodiment 1, the attachment and detachment of the scaffolding member 20 can be easily performed.

Specifically, when attaching the scaffolding member 20 to the side portion 30 (support bracket 50) of the revolving frame 3, the worker lifts the scaffolding member 20 and hooks the upper engagement portion 70 of the base end portion 43 of the scaffolding bracket 40 onto the upper engagement portion 80 of the support bracket 50, so that the upper engagement portions 70, 80 enter an upper engagement state, and the scaffolding bracket 40 is rotatably supported by the support bracket 50. Then, in this state, simply rotating the scaffolding bracket 40 in the first direction in which the tip of the scaffolding bracket 40 descends brings the lower engagement portions 75, 85 into contact, and the scaffolding bracket 40 enters a lower engagement state in which rotation in the first direction and upward movement are restricted.

In other words, in this embodiment 1, after the upper engagement parts 70, 80 are engaged, the worker can perform the installation work without supporting the load of the scaffolding member 20 and the scaffolding bracket 40, so the burden on the worker in the installation work of the scaffolding member 20 can be reduced. Similarly, in the installation and removal work of the scaffolding member 20, the worker can perform the installation and removal work without supporting the load of the scaffolding member 20 and the scaffolding bracket 40 until the upper engagement state of the upper engagement parts 70, 80 is released (the disengagement work of the lower engagement parts 75, 85), so the burden on the worker in the installation and removal work of the scaffolding member 20 can also be reduced. Therefore, according to the scaffolding structure 100 of this embodiment 1, the installation and removal work of the scaffolding member 20 can be easily performed.

In addition, the first direction in which the scaffold bracket 40 is rotated during the installation work is a direction that does not go against gravity acting on the tip of the scaffold bracket 40. Therefore, the installation work of the scaffold member 20, which rotates the scaffold bracket 40 in the first direction, can reduce the burden on the worker compared to the installation and removal work of the scaffold member 20, which rotates the scaffold bracket 40 in the second direction against gravity. On the other hand, due to the action of gravity, the scaffold bracket 40 is configured to be difficult to rotate in the second direction. Therefore, even if a force acts on the scaffold bracket 40 to rotate in the second direction due to machine vibration or the like in the installation state in which the scaffold member 20 is attached to the side part 30 of the rotating frame 3, it will not rotate in the second direction with a small force, and the scaffold member 20 will not fall off from the side part 30 of the rotating frame 3.

In addition, in the scaffolding structure 100 of this embodiment 1, by hooking the upper engaging portion 70 to the upper engaging portion 80 from above, the upper engaging portions 70, 80 are in an upper engaged state in which the upper shaft portion 52 fits into the recess 71 and the scaffolding bracket 40 is rotatably supported by the support bracket 50, and when the scaffolding bracket 40 is rotated in this state, the lower engaging portions 75, 85 are in a lower engaged state, so that the rotation in the first direction and the upward movement of the scaffolding bracket 40 are restricted. With this configuration, in the scaffolding structure 100 of this embodiment 1, even if the scaffolding member 20 is subjected to vertical vibration when the scaffolding member 20 is attached to the side portion 30 of the rotating frame 3, the upper engaged state of the upper engaging portions 70, 80 is not released, and there is no risk of the scaffolding member 20 falling off the side portion 30 of the rotating frame 3.

In addition, in the scaffolding structure 100 of this embodiment 1, the load of the scaffolding member 20 and the scaffolding bracket 40 is applied to the upper engagement portion 80 (upper shaft portion 52) of the support bracket 50 attached to the side portion 30 of the revolving frame 3. In other words, unlike conventional scaffolding structures, in the scaffolding structure 100 of this embodiment 1, the load of the scaffolding member 20 and the scaffolding bracket 40 is supported by a fixed member (upper shaft portion 52 of the support bracket 50) rather than a movable member (conventionally a lock pin that slides). Therefore, according to this embodiment 1, it is possible to provide a scaffolding structure 100 for a construction machine 10 in which there is no risk of the scaffolding member 20 becoming unable to be removed even if an excessive load is applied.

In addition, in this embodiment 1, the scaffolding structure 100 is configured to include a locking mechanism 60 that restricts the rotation of the scaffolding bracket 40 in a second direction opposite to the first direction when the upper engagement parts 70, 80 and the lower engagement parts 75, 85 are both in an engaged state (upper engagement state and lower engagement state). According to this scaffolding structure 100, even if a force that rotates the scaffolding bracket 40 in the second direction acts on the scaffolding member 20 when the scaffolding member 20 is attached to the side part 30 of the revolving frame 3, the rotation of the scaffolding bracket 40 in the second direction is restricted, so that the lower engagement state of the lower engagement parts 75, 85 is not released. Also, since the lower engagement state of the lower engagement parts 75, 85 is not released, even if a vertical vibration acts on the scaffolding member 20, the upward movement of the scaffolding bracket 40 is restricted, and the upper engagement state of the upper engagement parts 70, 80 is not released. Therefore, with the above-mentioned scaffolding structure 100, there is no risk of the scaffolding member 20 falling off the side portion 30 of the revolving frame 3.

In addition, in this embodiment 1, the locking mechanism 60 is configured to have a locking member 61 that is attached to the scaffolding bracket 40 and is separate from the upper shaft portion 52, which restricts the rotation of the scaffolding bracket 40 in the second direction by abutting against the side portion 30 of the rotating frame 3. Therefore, in the scaffolding structure 100 of this embodiment 1, the locking member 61 attached to the scaffolding bracket 40 abuts against the side portion 30 of the rotating frame 3, restricting the rotation of the scaffolding bracket 40 in the second direction, and the scaffolding member 20 does not fall off from the side portion 30 of the rotating frame 3. Therefore, according to this embodiment 1, a locking mechanism 60 that prevents the scaffolding member 20 from falling off can be easily configured by simply providing the locking member 61 to the scaffolding bracket 40.

In addition, in this embodiment 1, the locking member 61 is configured as a separate member from the upper shaft portion 52 on which the loads of the scaffolding member 20 and the scaffolding bracket 40 act. In other words, in this embodiment 1, unlike conventional scaffolding structures, the loads of the scaffolding member 20 and the scaffolding bracket 40 do not act on the locking member 61, so the locking member 61 is not deformed by the loads of the scaffolding member 20 and the scaffolding bracket 40 and the locking function is not impaired.

In addition, in this embodiment 1, the locking member 61 is configured to be movable between a locked position in which it abuts against the side portion 30 of the swivel frame 3 to restrict the rotation of the scaffolding bracket 40 in the second direction, and an unlocked position in which it allows the rotation of the scaffolding bracket 40 in the second direction. Therefore, according to the scaffolding structure 100 of this embodiment 1, it is possible to easily prevent the scaffolding member 20 from falling off simply by moving the locking member 61 attached to the scaffolding bracket 40 from the locked position to the unlocked position. In addition, the locking member 61 is configured to be movable and is a separate member from the upper shaft portion 52. Therefore, when the locking member 61 is moved, the load of the scaffolding member 20 and the scaffolding bracket 40 does not act on the locking member 61, making it easy to move the locking member 61.

In addition, in this embodiment 1, when the upper engagement parts 70, 80 and the lower engagement parts 75, 85 are both in an engaged state (upper engagement state and lower engagement state), at least a part of the locking member 61 is configured to abut against the side part 30 of the revolving frame 3 at a position above the axis X of the upper shaft part 52 which is the rotation axis of the scaffolding bracket 40. With this configuration, in the mounting state of the scaffolding member 20 in which the upper engagement parts 70, 80 and the lower engagement parts 75, 85 are both in an engaged state (upper engagement state and lower engagement state), it is possible to reliably prevent the scaffolding bracket 40 from rotating in the second direction and releasing the lower engagement state of the lower engagement parts 75, 85. Therefore, it is possible to reliably prevent the scaffolding member 20 from falling off.

In addition, in this embodiment 1, the upper engagement part 70 of the scaffolding bracket 40 is composed of a recess 71 that opens downward, and the upper engagement part 80 of the support bracket 50 is composed of an upper shaft part 52 that fits into the recess 71 in the upper engagement state. Therefore, according to this embodiment 1, the upper engagement part 70, which is formed into a hook shape by the recess 71 that opens downward, can be hooked from above onto the upper engagement part 80 consisting of the upper shaft part 52 that extends in the front-rear direction, so that the upper engagement parts 70, 80 can be easily placed in the upper engagement state.

In addition, in this embodiment 1, the recess 71 is formed in an inverted U-shape such that the lower end 71a on the side 30 side of the revolving frame 3 is located below the axis X of the upper shaft 52 when the upper engagement parts 70, 80 are in the upper engagement state. In other words, the recess 71 is formed deep enough that the upper shaft is fitted inside up to the axis X. Therefore, even if the scaffolding member 20 and the scaffolding bracket 40 rotate slightly in the second direction due to sudden shaking, the hook-shaped upper engagement part 70 (recess 71) does not come off the upper engagement part 80 (upper shaft 52), and the upper engagement state in which the upper engagement part 70 is hooked on the upper engagement part 80 can be maintained. Therefore, according to the scaffolding structure 100 of this embodiment 1, it is possible to more reliably prevent the scaffolding member 20 from falling off.

In this embodiment 1, the side 30 of the revolving frame 3 is formed in a cylindrical shape, and the support bracket 50 is provided in the internal space 35 of the side 30. The base end 43 of the scaffolding bracket 40 is inserted into the opening 33 formed in the side 30 of the revolving frame 3 and engaged with the support bracket 50, so that the scaffolding bracket 40 is supported by the support bracket 50 and the scaffolding member 20 is attached in an outwardly protruding state from the side 30 of the revolving frame 3. Thus, according to the scaffolding structure 100 of this embodiment 1, since the support bracket 50 is disposed inside the side 30 of the revolving frame 3, when the scaffolding member 20 is removed from the side 30 of the revolving frame 3, the support bracket 50 does not protrude from the side 30 of the revolving frame 3. This allows the vehicle width of the upper revolving body 2 to be within the cargo width limit of the transport vehicle.

In the present embodiment 1, as described above, the base end 43 of the scaffolding bracket 40 must be inserted into the inside of the cylindrical side portion 30 through the opening 33, and the base end 43 of the scaffolding bracket 40 and the support bracket 50 must be engaged therein, making it difficult to visually observe the engaged portion. However, as described above, the scaffolding structure 100 of the present application is configured such that the base end 43 of the scaffolding bracket 40 can be easily engaged with the support bracket 50 by simply hooking the upper engagement portion 70 onto the upper engagement portion 80 from above and rotating the scaffolding bracket 40 in the first direction according to gravity, and the base end 43 of the scaffolding bracket 40 and the support bracket 50 can be easily disengaged by the reverse operation. Therefore, even if the structure is such that the base end 43 of the scaffolding bracket 40 and the support bracket 50 are engaged inside the side portion 30 of the revolving frame 3, the installation and removal work of the scaffolding member 20 can be easily performed.

Second Embodiment of the Invention
In the second embodiment, the configuration of part of the scaffolding structure 100 (the upper engagement portion 80 and the lower engagement portion 85 of the support bracket 50) in the first embodiment is changed.

Specifically, as shown in FIG. 9, in the second embodiment, the support bracket 50 is configured to include a pair of plate-like members 51, 51 similar to those in the first embodiment, and one support member 54 extending in the front-rear direction between the pair of plate-like members 51, 51. The one support member 54 is formed integrally by connecting the upper shaft portion 52 and the lower shaft portion 53 of the first embodiment. The upper and lower surfaces of the support member 54 are formed as curved surfaces having a semicircular cross section. With this configuration, in the second embodiment, the upper end of the support member 54 becomes the upper shaft portion 52 on which the upper engagement portion 70 formed in a hook shape by the recess 71 is hooked, and the lower end of the support member 54 becomes the lower shaft portion 53 on which the L-shaped lower engagement portion 85 (the vertical portion 76a and the horizontal portion 76b of the abutment portion 76) abuts.

As described above, the upper engagement portion 80 and the lower engagement portion 85 of the support bracket 50 may be configured as part of the support member 54. Even with this configuration, the scaffolding member 20 can be easily attached and detached by the same attachment and detachment operation as in embodiment 1, and other effects of embodiment 1 can be similarly achieved.

Third Embodiment of the Invention
In the third embodiment, the configuration of part of the scaffolding structure 100 (the upper engagement portions 70, 80 and the lower engagement portions 75, 85 of the scaffolding bracket 40 and the support bracket 50) is changed from that of the first embodiment.

Specifically, as shown in Figures 10 and 11, in the third embodiment, the upper engagement portion 70 and the lower engagement portion 75 of the scaffolding bracket 40 are formed by shaft portions 45, 46 extending in the front-rear direction, and the upper engagement portion 80 and the lower engagement portion 85 of the support bracket 50 are formed by recesses 81, 86 into which the shaft portions 45, 46 fit.

In the third embodiment, the base end 43 of the scaffolding bracket 40 has a recess 71 formed at the top and an L-shaped abutment 76 formed at the bottom, but instead has two shafts 45, 46 extending in the front-rear direction. The two shafts 45, 46 are made of cylindrical members and are provided so as to penetrate the base end 40 of the scaffolding bracket 40 in the front-rear direction. Of the two shafts 45, 46, the lower shaft 46 is provided so as to be located more inward of the vehicle than the upper shaft 45 in the left-right direction.

In addition, in the third embodiment, the opening 33 formed on the outer surface of the side portion 30 of the revolving frame 3 is made wider than in the first embodiment. The opening 33 is made to have a width (longer than the axial length of the shaft portions 45, 46) that allows the two shaft portions 45, 46 to pass through when the base end portion 43 of the scaffolding bracket 40 is inserted into the internal space 35.

In the third embodiment, the support bracket 50 is composed of only a pair of plate-like members 51, 51 spaced apart in the front-rear direction, and does not include two shafts 52, 53. In the third embodiment, the pair of plate-like members 51, 51 are cut out at two locations, top and bottom, so as to have two recesses 81, 86. An L-shaped groove 82 is formed in the upper part of the plate-like member 51, which extends from the outer end outside the vehicle to the inside of the vehicle and then bends downward. On the other hand, a groove 87 is formed in the lower part of the plate-like member 51, which extends from the outer end outside the vehicle to the inside of the vehicle and becomes narrower in width (vertical length) as it approaches the inside of the vehicle. The bottom of the groove 81 becomes the upper recess 81 into which the upper shaft 45 fits (is held). The inner end of the groove 82 becomes the lower recess 86 into which the lower shaft 46 fits (is held).

[Attachment and detachment of scaffolding members]
(Installation operation)
In the third embodiment, the base end 43 of the scaffolding bracket 40 is inserted into the inside of the side part 30 of the revolving frame 3 through the opening 33 of the support bracket 50. Then, the scaffolding bracket 40 is tilted so that the tip end is positioned above the base end 43, and the upper engagement part 70 (upper shaft part 45) of the scaffolding bracket 40 is hooked from above onto the upper engagement part 80 (upper recess 81) of the support bracket 50. As a result, the upper engagement parts 70, 80 are in an upper engagement state in which the scaffolding bracket 40 is supported by the support bracket 50 so as to be rotatable around the axis of the upper shaft part 45 by fitting the upper shaft part 45 into the upper recess 81.

After the upper engagement parts 70 and 80 are in the upper engagement state, the scaffolding bracket 40, which is tilted so that the tip is located above the base end 43, is rotated around the axis X' of the upper shaft part 45 in the first direction in which the tip of the scaffolding bracket 40 descends. When the support part 44 of the scaffolding bracket 40 is rotated to a position where it extends horizontally (a position where the upper surface of the scaffolding member 20 becomes a horizontal plane), the lower engagement part 75 (lower shaft part 46) of the scaffolding bracket 40 abuts against the lower engagement part 85 (lower recess 86) of the support bracket 50. As a result, the lower engagement parts 75 and 85 are in a lower engagement state in which the rotation in the first direction and the upward movement of the scaffolding bracket 40 are restricted by the lower shaft part 46 abutting against the upper part and the inner part (bottom of the groove 82) of the lower recess 86.

As described above, in the third embodiment as well, the scaffolding member 20 can be attached to the side portion 30 of the swivel frame 3 by engaging the upper engagement portions 70, 80 and the lower engagement portions 75, 85 in that order (putting the upper engagement state and the lower engagement state in place). In the third embodiment as well, a locking operation similar to that in the first embodiment is further performed to prevent the scaffolding member 20 from falling off.

(Detachment operation)
In the third embodiment, similarly to the first embodiment, after the lock member 61 of the lock mechanism 60 is fixed to the unlocked position, the lower engagement state of the lower engagement portions 75, 85 is released.

Specifically, the scaffolding bracket 40 is rotated around the axis X' of the upper shaft portion 45 in the second direction in which the tip portion rises. As a result, the lower shaft portion 46 moves outside the lower recess 86, and the lower shaft portion 46 no longer abuts against the lower recess 86, and the lower engagement state of the lower engagement portions 75, 85 is released.

After releasing the lower engagement state of the lower engagement parts 75, 85, release the upper engagement state of the upper engagement parts 70, 80.

Specifically, the scaffolding bracket 40, which is tilted so that its tip is positioned higher than its base end 43, is lifted upward and moved away from the upper engagement portion 80 (upper recess 81) of the support bracket 50. As a result, the base end 43 (upper shaft portion 45) of the scaffolding bracket 40 is no longer rotatably supported by the support bracket 50 (upper recess 81), and the upper engagement state of the upper engagement portions 70, 80 is released.

As described above, in the third embodiment, the scaffolding member 20 can be removed from the side portion 30 of the swivel frame 3 by releasing the engagement state (upper engagement state, lower engagement state) of the upper engagement portions 70, 80 and the lower engagement portions 75, 85 in that order.

As with embodiment 1, embodiment 3 also allows the scaffolding member 20 to be easily attached and detached, and other advantages of embodiment 1 can also be achieved.

Fourth embodiment of the invention
In the fourth embodiment, the configuration of a part (locking mechanism 60) of the scaffolding structure 100 in the first embodiment is changed.

Specifically, in the first embodiment, the locking member 61 is configured to be movable between the locked position and the unlocked position, but in the fourth embodiment, it is configured to be immovable.

As shown in FIG. 12, in the fourth embodiment, the locking mechanism 60 includes a locking member 61 and a fixing pin 62, but does not include a locking pin 63. The fixing pin 62 is configured to be inserted into an insertion hole (not shown) formed in the base end 43 of the scaffolding bracket 40 and the locking member 61, thereby non-rotatably attaching the locking member 61 to the base end 43 of the scaffolding bracket 40.

In the fourth embodiment, after the scaffolding member 20 is attached to the side portion 30 of the revolving frame 3, the locking member 61 is attached to the base end portion 43 of the scaffolding bracket 40 by a fixing pin 62 so that a portion (a part of the side surface on the vehicle body side) abuts against the outer surface of the side portion 30 of the revolving frame 3, thereby restricting the rotation of the scaffolding bracket 40 in the second direction.

Other Embodiments
The configurations of the engagement parts 70, 75 of the scaffolding bracket 40 and the engagement parts 80, 85 of the support bracket 50 are not limited to those of the above-mentioned embodiments 1 to 4. For example, in the scaffolding structure 100 of embodiment 1, the upper engagement parts 70, 80 may be composed of an upper shaft part 45 provided on the scaffolding bracket 40 and an upper recess 81 formed on the support bracket 50 as in embodiment 3. Also, in the scaffolding structure 100 of embodiment 1, the lower engagement parts 75, 85 may be composed of a lower shaft part 46 provided on the scaffolding bracket 40 and a lower recess 86 formed on the support bracket 50 as in embodiment 3.

In the above-mentioned first to third embodiments, the locking member 61 of the locking mechanism 60 is rotatably attached to the base end 43 of the scaffolding bracket 40 and is configured to restrict the rotation of the scaffolding bracket 40 in the second direction by abutting against the outer surface of the side portion 30 of the rotating frame 3 in the locked position, but the configuration of the locking mechanism 60 is not limited to this. For example, the locking member 61 may be slidably attached to the base end 43 of the scaffolding bracket 40 and is configured to restrict the rotation of the scaffolding bracket 40 in the second direction by abutting against the outer surface of the side portion 30 of the rotating frame 3 in the locked position. The locking member 61 may also be rotatably or slidably attached to the side portion 30 of the rotating frame 3 and is configured to restrict the rotation of the scaffolding bracket 40 in the second direction by abutting against the base end 43 of the scaffolding bracket 40 in the locked position.

As described above, the present invention is useful for scaffolding structures for construction machinery.

2 Upper rotating body
3 Swivel frame (frame)
10. Construction machinery
20 Scaffolding members
30 Side
33 Opening
35 Interior space
40 Scaffolding bracket
43 Base end
45 Upper shaft portion
50 Support bracket
52 Upper shaft portion
60 Locking mechanism
61 Lock member
70 Upper engagement portion (first upper engagement portion)
71 Recess (upper recess)
75 Lower engaging part (first lower engaging part)
80 Upper engagement portion (second upper engagement portion)
81 Upper recess
85 Lower engaging part (second lower engaging part)
100 Scaffolding structure

Claims (8)

A scaffolding structure for a construction machine, comprising a side portion extending in a front-rear direction of a frame of an upper rotating body of the construction machine, and a scaffolding member provided so as to protrude outward from the side portion of the frame,
a scaffold bracket extending outwardly from a side of the frame and to which the scaffold member is fixed;
a support bracket attached to a side of the frame and supporting a base end of the scaffolding bracket;
The base end of the scaffolding bracket has a first upper engagement portion and a first lower engagement portion,
the support bracket has a second upper engagement portion that engages with the first upper engagement portion and a second lower engagement portion that engages with the first lower engagement portion,
The first and second upper engagement portions are
One of the shaft portions is an upper shaft portion extending in the front-rear direction, and the other is an upper recessed portion into which the upper shaft portion is fitted,
When the first upper engagement portion is hooked onto the second upper engagement portion from above, the upper shaft portion fits into the upper recess, thereby placing the scaffolding bracket in an upper engagement state in which it is supported on the support bracket so as to be rotatable around the axis of the upper shaft portion,
A scaffolding structure for a construction machine, characterized in that when the first and second upper engagement portions are in the upper engagement state, the first and second lower engagement portions are configured so that when the scaffolding bracket is rotated around the axis of the upper shaft portion in a first direction in which the tip of the scaffolding bracket descends, the first lower engagement portion abuts against the second lower engagement portion at a position where the scaffolding member protrudes outward from the side of the frame, thereby entering a lower engagement state in which the rotation of the scaffolding bracket in the first direction and upward movement are restricted. The scaffolding structure for a construction machine according to claim 1,
A scaffolding structure for a construction machine, characterized in that it is provided with a locking mechanism that restricts rotation of the scaffolding bracket in a second direction opposite to the first direction when the first and second upper engagement portions are in the upper engagement state and the first and second lower engagement portions are in the lower engagement state. The scaffolding structure for a construction machine according to claim 2,
A scaffolding structure for a construction machine, characterized in that the locking mechanism has a locking member that is attached to the scaffolding bracket and is a separate member from the upper shaft portion that abuts against the side portion of the frame to restrict rotation of the scaffolding bracket in the second direction. A scaffolding structure for a construction machine according to claim 3,
A scaffolding structure for a construction machine, characterized in that the locking member is configured to be movable between a locked position in which it abuts against a side portion of the frame to restrict rotation of the scaffolding bracket in the second direction, and an unlocked position in which it allows rotation of the scaffolding bracket in the second direction. A scaffolding structure for a construction machine according to claim 3 or 4,
A scaffolding structure for a construction machine, characterized in that the locking member is configured to restrict rotation of the scaffolding bracket in the second direction by abutting at least a portion of the locking member against the side of the frame at a position above the axis of the upper shaft portion. The scaffolding structure for a construction machine according to any one of claims 1 to 5,
The first upper engagement portion is formed by the upper recess that opens downward,
A scaffolding structure for a construction machine, characterized in that the second upper engagement portion is constituted by the upper shaft portion. The scaffolding structure for a construction machine according to claim 6,
A scaffolding structure for a construction machine, characterized in that the upper recess is formed into an inverted U-shape such that when the first and second upper engagement portions are in the upper engagement state, the lower end of the side portion of the frame is located below the axis of the upper shaft portion. The scaffolding structure for a construction machine according to any one of claims 1 to 7,
The side portion of the frame is formed in a cylindrical shape so as to form an internal space extending in the front-rear direction,
An opening through which the base end of the scaffolding bracket can be inserted is formed in the side of the frame,
A scaffolding structure for construction machinery, characterized in that the support bracket is arranged inside the frame.

Images