Unloading aid device, aerial work platform, and method of operating unloading aid device

Abstract

Provided are an unloading auxiliary device, an elevated work platform, and an operating method for the unloading auxiliary device, which improve the safety of high-altitude work when unloading heavy objects. [Solution] The unloading assist device 1 is a device that is placed on the work platform 2 of the aerial work vehicle 100 and assists in the lowering of a heavy object suspended from the arm 33 of a lifting machine 3 placed on the work platform 2, and is equipped with a horizontal section 11 that extends in an approximately horizontal direction and a movable section 12 that is supported so as to be freely movable from the horizontal section 11, and is characterized in that the movable section 12 can be freely switched between a first state in which it is supported by the horizontal section 11 at a standby position on the horizontal section 11 away from the tip of the horizontal section 11, and a second state in which it is supported by the horizontal section 11 at an unloading position on the horizontal section 11 that is the tip.

Description

[Technical Field]

[0001] The present invention relates to an auxiliary unloading device, an aerial work platform, and a method of operating an auxiliary unloading device, which are primarily used when working at height. [Background technology]

[0002] Conventionally, devices have been developed for efficiently installing heavy objects at high locations.

[0003] Patent Documents 1 and 2 disclose aerial work platforms with a lifting machine mounted on a work platform. However, when unloading a heavy load, the arm lifting the heavy load extends outside the work platform in a plan view, causing the center of gravity of the work platform to move outside the work platform in a plan view, which creates the risk of the work platform tilting or tipping over and causing workers to fall. As a solution to this problem, Patent Documents 3 and 4 disclose aerial work platforms that stabilize the center of gravity by balancing the work platform when lifting a heavy load. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 06-191796 [Patent Document 2] Japanese Patent Application Publication No. 10-157993 [Patent Document 3] Japanese Patent Application Laid-Open No. 2001-146396 [Patent Document 4] Japanese Patent Application Publication No. 07-252094 Summary of the Invention [Problem to be solved by the invention]

[0005] The vehicle for aerial work disclosed in Patent Document 3 can optimally balance the equipment when unloading heavy objects by changing the position of the counterweight. Furthermore, the vehicle for aerial work disclosed in Patent Document 4 can optimally balance the vehicle for aerial work without using balance weights by rotating the openable and closable outrigger frames around the reference frame as an axis. However, according to Patent Documents 3 and 4, control is required to optimize the balance of the work platform every time the center of gravity of the work platform moves due to the operation of the lifting machine, so there is room for improvement in the reliability of balancing the work platform and stabilizing the center of gravity, and there is a problem in that it is not possible to improve the safety of work at heights when unloading heavy objects.

[0006] The present invention has been devised in consideration of the above-mentioned problems, and its purpose is to provide an unloading auxiliary device, an aerial work platform, and an operating method of an unloading auxiliary device that improve the safety of working at heights when unloading heavy objects. [Means for solving the problem]

[0007] The unloading assist device in the first invention is arranged on the working platform of an aerial work vehicle, and is used to lift a heavy object suspended from the arm of a lifting machine arranged on the working platform. From the work floor The unloading assist device assists descent and includes a horizontal section extending in a substantially horizontal direction and a movable section supported movably from the horizontal section, the movable section being configured to have a first state in which it is supported by the horizontal section at a standby position on the horizontal section spaced apart from the tip of the horizontal section, and a second state in which it is supported by the horizontal section at a unloading position on the horizontal section that is the tip of the horizontal section. Push it outward beyond the outer edge of the work floor. The first state is characterized in that the horizontal portion is supported by the first state while in contact with the first state.

[0008] The unloading auxiliary device of the second invention is characterized in that, in the first invention, the movable part has a first rotating part that extends in one direction and has one end that is rotatably supported from the horizontal part in the standby position, and a second rotating part that extends in one direction and has a part that is rotatably supported from the other end of the first rotating part and another part that is detachably supported on the tip of the horizontal part in the second state.

[0009] The unloading auxiliary device of the third invention is characterized in that, in the second invention, the horizontal portion has a fitting receiving portion at the unloading position into which the other portion of the second pivoting portion is fitted.

[0010] The unloading assisting device according to a fourth aspect of the present invention is the device according to the first aspect of the present invention, wherein the movable portion is supported so as to be movable in the substantially horizontal direction from the horizontal portion.

[0011] The aerial work platform of the fifth invention comprises an unloading auxiliary device described in any one of the first to fourth inventions, and a work floor of the aerial work vehicle to which the unloading auxiliary device is fixed, and is characterized in that the tip of the unloading auxiliary device is fixed to the outer edge of the work floor.

[0012] The method for operating the unloading assist device in the sixth aspect of the present invention is to use the unloading assist device arranged on the working platform of an aerial work vehicle to lift a heavy object suspended from the arm of a crane arranged on the working platform. From the work floor A method for operating an unloading assist device that assists descent, comprising: moving a movable section movably supported on a horizontal section that is extended in a substantially horizontal direction from a first state in which the movable section is supported on the horizontal section at a standby position on the horizontal section that is spaced from the tip of the horizontal section; and moving the movable section to a unloading position on the horizontal section that is the tip of the horizontal section. Push it outward beyond the outer edge of the work floor. The device is characterized by switching to a second state in which the device is supported by the horizontal portion while in contact with the horizontal portion. [Effects of the Invention]

[0013] According to the first to fifth aspects of the present invention, the movable part is in a first state in which it is supported by the horizontal part at a standby position on the horizontal part, and in a loading position at the tip of the horizontal part in which it is possible to load a heavy object. Push it outward beyond the outer edge of the work floor. The lifting device can be freely switched between a first state, in which the lifting device is in contact with the horizontal section, and a second state, in which the lifting device is supported by the horizontal section while in contact with the horizontal section. This allows the lifting device to push the heavy object to the unloading position on the horizontal section without the center of gravity of the lifting device protruding outside the work platform in a plan view, and prevents the center of gravity of the work platform from moving outside the work platform in a plan view. This improves the safety of working at heights when unloading heavy objects.

[0014] In particular, according to the second aspect of the present invention, the movable section has a first pivoting section, one end of which is pivotally supported on the horizontal section in a standby position, and a second pivoting section, one portion of which is pivotally supported on the other end of the first pivoting section and the other portion of which is detachably supported on the tip of the horizontal section. Therefore, by pushing the second pivoting section diagonally downward around the horizontal section as an axis, the heavy object can be pushed to the unloading position on the horizontal section, making it easier for the worker to push the heavy object by using their body weight compared to pushing it in a substantially horizontal direction. This improves the workability of working at heights when unloading heavy objects.

[0015] In particular, according to the third aspect of the present invention, the horizontal section has a fitting receiving portion, into which the other portion of the second pivoting section is fitted, provided at the unloading position. This allows the movable section, which receives the reaction force from the pushed heavy object, to be reliably supported at the unloading position. This further improves the safety of working at heights when unloading heavy objects.

[0016] In particular, according to the fourth aspect of the present invention, the movable part is supported on the horizontal part so as to be movable in a substantially horizontal direction. Therefore, compared to when the movable part rotates, it is easier to maintain balance even when receiving a reaction force from the heavy object pushed out by the movable part, and the heavy object can be reliably pushed to the unloading position on the horizontal part. This further improves the safety of working at heights when unloading heavy objects.

[0017] According to the sixth aspect of the present invention, the operating method of the unloading assist device includes: moving the movable part, which is supported so as to be movable in a substantially horizontal direction from the horizontal part, from a first state in which the movable part is supported on the horizontal part at a standby position on the horizontal part, in a substantially horizontal direction to unload a heavy object at a unloading position on the horizontal part. Push it outward beyond the outer edge of the work floor.The lifting device switches to a second state in which it is supported by the horizontal section while in contact with the work platform. This allows the lifting device to push the heavy object to the unloading position on the horizontal section without the center of gravity of the lifting device protruding outside the work platform in a plan view, preventing the center of gravity of the work platform from moving outside the work platform in a plan view. This improves the safety of working at heights when unloading heavy objects. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram showing an example of a work platform and an auxiliary unloading device according to this embodiment. [Figure 2] FIG. 2 is a schematic diagram showing an example of the first state of the unloading assist device in this embodiment. [Figure 3] FIG. 3 is a schematic diagram showing an example of the second state of the unloading assist device in this embodiment. [Figure 4] FIG. 4 is a schematic diagram showing an example of a crane that constitutes the work platform in this embodiment. [Figure 5] FIG. 5 is a schematic diagram showing an example of a method of operating the unloading assist device in this embodiment. [Figure 6] FIG. 6 is a schematic diagram showing an example of a method of operating the unloading assist device in this embodiment. [Figure 7] FIG. 7 is a schematic diagram showing an example of a method of operating the unloading assist device in this embodiment. [Figure 8] FIG. 8 is a schematic perspective view showing a first modified example of the work platform and unloading assist device according to this embodiment. [Figure 9] FIG. 9 is a schematic plan view corresponding to FIG. [Figure 10] FIG. 10 is a schematic perspective view showing a first modified example of the unloading assist device in the first state according to the present embodiment. [Figure 11] FIG. 11 is a schematic perspective view showing a state in which the unloading assist device of this embodiment is in the middle of transition from the first modified first state to the first modified second state. [Figure 12]FIG. 12 is a schematic perspective view showing a first modified example of the unloading assist device in the second state according to the present embodiment. [Figure 13] FIG. 13 is a schematic side view showing a first modified example of the unloading assist device in the second state according to the present embodiment. [Figure 14] FIG. 14 is a schematic perspective view showing a second modified example of the work platform and unloading assist device of this embodiment in a state before installation. [Figure 15] FIG. 15 is a schematic perspective view showing the second modified example of the work platform and unloading assist device according to this embodiment in a state after installation. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an example of an unloading assist device 1, an aerial work platform 100, and an operation method of the unloading assist device 1 according to an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, a first horizontal direction X is defined, one horizontal direction perpendicular to the first horizontal direction X is defined as a second horizontal direction Y, and a direction perpendicular to each of the first horizontal direction X and the second horizontal direction Y is defined as a height direction Z. The components in each drawing are shown schematically for the purpose of explanation, and for example, the size of each component and the size comparison between components may differ from those shown in the drawings.

[0020] (100 high-altitude work platforms, 1 unloading aid) An example of an aerial work platform 100 and an unloading assist device 1 according to this embodiment will be described with reference to the drawings.

[0021] The aerial work platform 100 is a device used by a worker to perform work at height. The aerial work platform 100 is, for example, a work platform mounted on a known aerial work vehicle.

[0022] 1, the aerial work platform 100 includes an unloading auxiliary device 1, a work platform 2, a crane 3, and a carrying-out section O. A worker (not shown) can lower a heavy object H (see FIGS. 4 to 7) on the work platform 2 by lifting it with the crane 3 and using the unloading auxiliary device 1 to carry it out from the carrying-out section O, thereby lowering the heavy object H from the work platform 2.

[0023] The unloading assist device 1 is arranged on the work platform 2 and assists in the lowering of a heavy load H suspended from a lifting machine 3 arranged on the work platform 2.

[0024] The unloading assist device 1 includes a horizontal section 11 extending in a substantially horizontal direction (first horizontal direction X) and a movable section 12 supported from the horizontal section 11 so as to be movable in the substantially horizontal direction (first horizontal direction X). The movable section 12 is switchable between a first state (referring to the state shown in FIG. 2 , and the same applies below) in which it is supported by the horizontal section 11 at a standby position on the horizontal section 11 spaced from the tip of the horizontal section 11, and a second state (referring to the state shown in FIG. 3 , and the same applies below) in which it is supported by the horizontal section 11 while in contact with a heavy load H at a unloading position on the horizontal section 11 (the position of the unloading section O) at the tip of the horizontal section 11. In this case, the center of gravity of the lifting machine 3 does not extend outside the working platform 2 in a plan view, and the heavy load H can be pushed to the unloading position on the horizontal section 11, preventing the center of gravity of the working platform 2 from moving outside the working platform 2 in a plan view. This improves the safety of working at heights when unloading the heavy load H.

[0025] Furthermore, in the aerial work platform 100, for example, the tip of the horizontal part 11 provided on the unloading auxiliary device 1 is fixed to the upper surface or side surface of the outer edge of the work floor 2. At this time, the arm 33 of the crane 3 with the heavy object H lifted up can push the heavy object H to the unloading position on the horizontal part 11 via the movable part 12 without protruding outside the work floor 2 in a plan view, and the center of gravity of the work floor 2 can be prevented from moving outside the work floor 2 in a plan view. This improves the safety of working at heights when unloading the heavy object H.

[0026] The components of the aerial work platform 100 and the unloading auxiliary device 1 are made of, for example, steel.

[0027] <<Horizontal part 11>> The horizontal portion 11 has, for example, a substantially flat plate shape extending in a substantially horizontal direction. As shown in, for example, FIGS. 1 to 3, the horizontal portion 11 has a first locking portion 111, a second locking portion 112, and an extending portion 113. The horizontal portion 11 may lock (support) the movable portion 12 via, for example, the first locking portion 111, or may lock (support) the movable portion 12 via the second locking portion 112.

[0028] The first locking portion 111 is provided, for example, on the horizontal portion 11, separated from the tip of the horizontal portion 11, at a standby position where the movable portion 12 waits in the first state before contacting the heavy load H.

[0029] The first locking portion 111 is provided with, for example, a stopper 111a. The stopper 111a fixes the movable portion 12 on the horizontal portion 11 so that the movable portion 12 does not move, or releases the fixation, for example, by operation by an operator.

[0030] The second engaging portion 112 is, for example, at the tip of the horizontal portion 11, and is provided at a lowering position where the movable portion 12 pushes out the heavy load H to lower it in the second state where the movable portion 12 contacts the heavy load H.

[0031] The second locking portion 112 is provided with, for example, a fitting receiving portion 112a. At least a part of the movable portion 12 (for example, a second rotating portion 122 described later) is fitted into the fitting receiving portion 112a.

[0032] The extending portion 113 is provided to extend, for example, in the first horizontal direction X. On the extending portion 113, a first locking portion 111 and a second locking portion 112 are provided to be spaced apart from each other.

[0033] <<Movable part 12>> The movable portion 12 is movably supported by the horizontal portion 11. The movable portion 12 is supported, for example, at a standby position on the horizontal portion 11 spaced apart from the tip of the horizontal portion 11. Here, the standby position may be set near the rear end of the horizontal portion 11 as shown in FIG. 2, for example, or may be set at any position spaced apart from the tip of the horizontal portion 11.

[0034] Movable portion 12 has, for example, a first rotating portion 121 and a second rotating portion 122. First rotating portion 121 or second rotating portion 122 is fixed to horizontal portion 11 so as not to move, or the fixation is released, for example, by an operator operating stopper 111a.

[0035] The first rotating portion 121 extends, for example, in one direction, and one end of it is rotatably supported by the horizontal portion 11 at the standby position. The second rotating portion 122 extends, for example, in one direction, and one portion of it is rotatably supported by the other end of the first rotating portion 121, and the other portion of it is detachably supported at the tip of the horizontal portion 11. Specifically, for example, in the first state shown in FIG. 2, the first rotating portion 121 and the second rotating portion 122 rotate in the first movable direction F1 (for example, a direction on a plane perpendicular to the second horizontal direction Y), and a fitting portion 122a provided on the other portion of the second rotating portion 122 fits into a fitting receiving portion 112a of the horizontal portion 11, thereby switching to the second state shown in FIG. In this case, by pushing the second pivoting part 122 diagonally downward with the horizontal part 11 as an axis, the heavy object H can be pushed to the unloading position of the horizontal part 11, and it is easier for the worker to push the heavy object H by using his / her body weight compared to when pushing the heavy object H in a substantially horizontal direction. This improves the workability of working at heights when unloading the heavy object H. Conversely, after the heavy object H has been unloaded, in the second state, the first pivoting part 121 and the second pivoting part 122 rotate in the second movable direction F2 (for example, a direction on a plane perpendicular to the second horizontal direction Y) while the fitting part 122a provided on another part of the second pivoting part 122 is engaged with the first engaging part 111 of the horizontal part 11, thereby switching to the first state shown in FIG.

[0036] The other part of the second rotating part 122, the fitting part 122a, may be fitted into the fitting receiving part 112a provided at the unloading position on the horizontal part 11. In this case, the movable part 12, which receives the reaction force from the pushed-out heavy object H, can be reliably supported at the unloading position. This further improves the safety of working at heights when unloading the heavy object H.

[0037] The second rotating part 122 has a handle 122b provided on a part of the second rotating part 122 that is pivotally supported on the other end of the first rotating part 121. The operator can fit the fitting part 122a into the fitting receiving part 112a by performing an operation to rotate the first rotating part 121 and the second rotating part 122 while holding the handle 122b.

[0038] Although the above describes an example in which the movable part 12 rotates, the movable part 12 may be supported by the horizontal part 11 so as to be movable in a substantially horizontal direction without rotating. In this case, the horizontal part 11 may have a rail shape that supports the movable part 12 so that the movable part 12 slides on its surface only in the extension direction of the horizontal part 11 (for example, the first horizontal direction X). In this case, compared to when the movable part 12 rotates, it is easier to maintain balance even when the movable part 12 receives a reaction force from the heavy object H pushed out by the movable part 12, and the heavy object H can be reliably pushed out to the unloading position on the horizontal part 11. This further improves the safety of working at heights when unloading the heavy object H.

[0039] The shape of the movable part 12 may be any shape that allows it to come into contact with and push out the heavy load H. The movable part 12 may be formed, for example, by combining a plurality of rods, by combining a substantially flat plate-shaped plate extending in the second horizontal direction Y perpendicular to the direction of movement, or by combining rods and plates. When plates are used for the movable part 12, the heavy load H comes into surface contact with the movable part 12 and is less likely to come off the movable part 12 than when rods are used, and this improves the safety of working at heights when unloading the heavy load H.

[0040] <Working Platform 2> The work floor 2 is used for an aerial work vehicle, and is made of a known floor material or scaffolding capable of carrying a heavy load H. The work floor 2 is provided with handrails for preventing falls, for example, and a carrying-out section O that can be opened and closed freely to carry out the heavy load H is provided on part of the handrail.

[0041] <Lifting machine 3> The lifting machine 3 is fixed on the work platform 2 and lifts the heavy load H. As the lifting machine 3, for example, a known crane device is used.

[0042] 1, the lifting machine 3 has a base 31, a support part 32, an arm 33, and a suspending part 34. The lifting machine 3 is fixed to the work floor 2, for example, via the base 31. The lifting machine 3 lifts a heavy load H, for example, via the suspending part 34 at the tip of the arm 33, which can perform movements such as rotation around the support part 32 as an axis.

[0043] The base 31 includes, for example, a first base portion 311, a second base portion 312, a lift-up detection portion 313, and a stop operation portion 314.

[0044] The first base portion 311 is provided to extend in, for example, the second horizontal direction Y. The second base portion 312 is provided to extend in, for example, the first horizontal direction X, and is fixed to both ends of the first base portion 311 by welding or bolts, etc.

[0045] The lift-up detection unit 313 is connected to, for example, an operation control unit (not shown) of the lifting machine 3, and is attached to the second base 312. For example, when the lifting machine 3 carries the heavy object H it has lifted to the vicinity of the discharge section O, the center of gravity of the lifting machine 3 is biased toward the discharge section O, so the lift-up detection unit 313 can quickly detect that the second base 312 has separated from the work platform 2 and lifted up, and can perform emergency operation processing on the lifting machine 3. This prevents the lifting machine 3 from tipping over, and improves the safety of working at heights when unloading the heavy object H.

[0046] The stop operation unit 314 is connected to, for example, an operation control unit (not shown) of the lifting machine 3, and has an operation rope hanging downward from the work platform 2. For example, when a worker waiting for the heavy object H to be lowered below the discharge section O detects an abnormality and pulls the operation rope, the stop operation unit 314 makes an emergency stop to the operation of the lifting machine 3. This makes it possible to respond to the occurrence of an abnormality in the blind spot of the worker on the work platform 2, and improves the safety of working at heights when the heavy object H is being lowered.

[0047] (An example of how the unloading assist device 1 operates) Next, an example of an operation method of the unloading assist device 1 in this embodiment will be described with reference to the drawings.

[0048] <Advance preparation> 4, the worker first performs the operation of lifting the heavy load H. In more detail, from the stored state in which the arm 33 and the lifting part 34 of the crane 3 are lowered, the worker raises the arm 33 and lowers the lifting part 34 to a position where the heavy load H can be attached, and then performs the slinging to lift the heavy load H.

[0049] The worker then performs the operation of carrying out the heavy load H. More specifically, the worker lifts the arm 33 and rotates the arm 33 horizontally around the support part 32 as an axis with the heavy load H suspended therefrom, thereby placing the heavy load H at the position of the carrying-out part O. At this time, the tip of the arm 33 and the suspending part 34 are located at the reference position RP, which is, for example, on approximately the outer edge of the work floor 2 in a plan view, and the center of gravity of the lifting machine 3 is located on the work floor 2 in a plan view, so that the lifting machine 3 or the work floor 2 will not tip over. In this embodiment, the tip of the arm 33 may be located at the reference position RP, which is approximately on the outer edge of the work floor 2, or may be located inside the reference position RP as long as it is on the work floor 2.

[0050] If the heavy load H were to be lowered in this state, it would hit the work platform 2, so in the prior art it was necessary to extend the tip of the arm 33 beyond the reference position RP to an outer position OP, which is further outward. In this case, the center of gravity of the lifting machine 3 would protrude from the work platform 2 in a plan view, which could result in the lifting machine 3 or the work platform 2 tipping over. On the other hand, in this embodiment, it is not necessary to extend the tip of the arm 33 to the outer position OP.

[0051] In the example of Figure 4, the unloading auxiliary device 1 has been omitted for the sake of convenience, but the unloading auxiliary device 1 may be installed on the work platform 2 at least at any time before or after the lifting operation of the heavy object H or before or after the carrying out operation.

[0052] <Unloading process> As shown in FIG. 5, for example, when a heavy load H is lifted by the crane 3 at the reference position RP of the unloading section O, the unloading assist device 1 is in a first state in which the movable section 12 is supported by the first locking section 111, which is the standby position of the horizontal section 11. Thereafter, the worker releases the first locking section 111, thereby releasing the first state of the movable section 12 (second pivoting section 122) and moving it toward the unloading position (unloading section O), which is the tip of the horizontal section 11. At this time, the second locking section 112, which is the unloading position on the horizontal section 11, is located outside the outer edge of the work floor 2. Therefore, as shown in FIG. 6, for example, the movable section 12 comes into contact with the heavy load H located on the outer edge of the work floor 2 (at the reference position RP) before reaching the second locking section 112.

[0053] Thereafter, as shown in Fig. 7, for example, the worker switches the movable part 12 to the second state by pushing the movable part 12 from the reference position RP toward the outer position OP while the movable part 12 and the heavy load H are in contact with each other and locking the movable part 12 with the second locking part 112. As a result, the heavy load H is pushed toward the outer position OP via the movable part 12, and is lowered by operating the lifting machine 3 without hitting the work platform 2. Note that during the unloading process, there is no need to perform the lifting, horizontal or rotating operations of the lifting machine 3.

[0054] That is, the worker switches the movable section 12 from a first state in which it is supported by the horizontal section 11 at a standby position on the horizontal section 11 to a second state in which it is supported by the horizontal section 11 while in contact with the heavy load H at a unloading position on the horizontal section 11. In this case, the center of gravity of the lifting machine 3 does not protrude outside the working platform 2 in a plan view, and the heavy load H can be pushed out to the unloading position on the horizontal section 11, preventing the center of gravity of the working platform 2 from moving outside the working platform 2 in a plan view. This improves the safety of working at heights when unloading the heavy load H.

[0055] By carrying out the above steps, the operating method of the unloading assist device 1 is completed.

[0056] (First modified example of aerial work platform 100 and unloading assist device 1) <Movable part 12> 8 to 10, the movable part 12 includes a protruding part 123, a protruding mechanism 124, and an opening stopper 125. Note that Fig. 10 shows the movable part 12 in a first state, and Figs. 8 and 9 show the movable part 12 in a second state.

[0057] <First rotating portion 121> 10, the first pivoting portion 121 has a guide hole 121h. The guide hole 121h is formed, for example, in a part of the first pivoting portion 121. The guide hole 121h is, for example, an elongated hole formed so as to extend along the extension direction of the first pivoting portion 121.

[0058] <Second rotating portion 122> As shown in Figures 8 and 9, for example, the second rotating part 122 has a base fitting part 122c, which is another part. The base fitting part 122c has, for example, a concave shape, and is fitted into the floor edge part 2a, which is the edge of the work floor 2. In this case, the movable part 12 can be locked to the work floor 2 even if the unloading auxiliary device 1 does not have the horizontal part 11 (particularly the second locking part 112), and the effort required to fix the horizontal part 11 to the work floor 2 can be reduced. This improves the workability of working at heights when unloading heavy objects H.

[0059] <Protrusion 123> The protruding portion 123 is a member for preventing a worker from falling. The protruding portion 123 protrudes, for example, relative to the movable portion 12. In this case, the worker is prevented from approaching the discharge portion O, and the risk of the worker falling from the work floor 2 can be reduced. This improves the safety of working at heights when unloading heavy objects H.

[0060] The protruding portion 123 is pivotally supported by, for example, the first rotating portion 121. The protruding portion 123 is pivotally supported by, for example, a protruding mechanism , and rotates relative to the first rotating portion 121 based on the operation of the protruding mechanism .

[0061] For example, as shown in FIG. 9, the protrusion 123 may protrude in a direction different from the extension direction of the first pivoting portion 121 in a plan view, or may protrude in the same direction as the extension direction of the first pivoting portion 121 in a plan view.

[0062] <Protrusion mechanism 124> The protruding mechanism 124 is a mechanism that causes the protruding portion 123 to protrude as shown in, for example, FIGS. 8 and 9, and that retracts the protruding portion 123 as shown in FIG.

[0063] The protrusion mechanism 124 has, for example, a first sliding portion 124a, a second sliding portion 124b, a joint portion 124c, a rotation control portion 124d, and a rotation guide portion 124e. In the protrusion mechanism 124, for example, when the second rotation portion 122 rotates in a direction away from the first rotation portion 121, the first sliding portion 124a, the second sliding portion 124b, the joint portion 124c, the rotation control portion 124d, and the rotation guide portion 124e simultaneously operate, thereby causing the protrusion portion 123 to protrude. Details of the operation of the protrusion mechanism 124 will be described later in an example of an operating method.

[0064] The first sliding portion 124a is a member that moves one end of the stopper 125 along the extension direction of the guide hole 121h. The first sliding portion 124a is fitted into the guide hole 121h and is slidable along the extension direction of the guide hole 121h.

[0065] The second sliding portion 124b is a member that moves one end of the stopper 125 along the extension direction of the guide hole 121h. The second sliding portion 124b is fitted into the guide hole 121h and is slidable along the extension direction of the guide hole 121h. The second sliding portion 124b faces and is spaced apart from the first sliding portion 124a, for example. The second sliding portion 124b moves in response to the rotation of the second rotating portion 122, similar to the first sliding portion 124a, for example, and therefore slides in the same direction and by the same distance as the first sliding portion 124a in conjunction with the sliding of the first sliding portion 124a. This stabilizes the rotation of the second rotating portion 122 relative to the first rotating portion 121.

[0066] The joint 124c is a member that operates the rotation control unit 124d. The joint 124c is joined to, for example, the stopper 125 and moves along the extension direction of the guide hole 121h in conjunction with the rotation of the stopper 125 accompanying the rotation of the second sliding unit 122. The joint 124c is joined to, for example, the first sliding unit 124a and moves together with the first sliding unit 124a along the extension direction of the guide hole 121h. The joint 124c is journaled to, for example, the rotation control unit 124d and moves together with the first sliding unit 124a along the extension direction of the guide hole 121h, rotating the rotation control unit 124d. The joint 124c joins the stopper 125 and the rotation control unit 124d, which rotate in different directions, and therefore uses a fixture having main surfaces extending in two or more different planar directions, such as an L-shaped metal fitting.

[0067] The rotation control unit 124d is a member that controls the rotational movement of the protruding and retracting of the protruding portion 123. The rotation control unit 124d is, for example, a rod-shaped or plate-shaped member, one end of which is pivotally supported by the joint portion 124c and the other end of which is pivotally supported by the protruding portion 123.

[0068] The rotation guide 124e is a member that guides the rotational movement of the protruding and retracting of the protruding portion 123. The rotation guide 124e is, for example, a rod-shaped or plate-shaped member, one end of which is pivotally supported by the first rotating portion 121 and the other end of which is pivotally supported by the protruding portion 123.

[0069] <Stop 125> The stopper 125 is a member that limits the range of rotation of the second rotating portion 122 when it rotates in a direction away from the first rotating portion 121. The stopper 125 is, for example, a rod-shaped or plate-shaped member, one end of which is pivotally supported by at least one of the first sliding portion 124a and the second sliding portion 124b, and the other end of which is pivotally supported by the second rotating portion 122. In this embodiment, the stopper 125 is formed of a pair of rod-shaped members that are independent of each other, one of which is pivotally supported by the first sliding portion 124a and the second rotating portion 122, and the other of which is pivotally supported by the second sliding portion 124b and the second rotating portion 122. The stopper 125 may be fixed to the first sliding portion 124a via, for example, a joint 124c.

[0070] (First modified example of the operation method of the aerial work platform 100 and the unloading assist device 1) The unloading auxiliary device 1 transitions from, for example, the first state of the movable part 12 shown in Figure 10 to the second state of the movable part 12 as shown in Figures 11 to 13, in which the second pivoting part 122 is deployed in the deployment direction FA away from the first pivoting part 121.

[0071] First, second pivoting portion 122 pivots in deployment direction FA around first pivotal portion A, which is pivotally supported by first pivoting portion 121. At this time, one end of stopper 125 is pulled up along guide hole 121h as the other end is pulled up via second pivotal portion B, which is pivotally supported by second pivoting portion 122. Thereafter, first sliding portion 124a is pulled up along guide hole 121h via third pivotal portion C, which is pivotally supported on one end of stopper 125. At this time, joining portion 124c is pulled up along guide hole 121h via third pivotal portion C in conjunction with the sliding of first sliding portion 124a. Furthermore, second sliding portion 124b is pulled up along guide hole 121h via third pivotal portion C', which is pivotally supported on one end of stopper 125.

[0072] Thereafter, one end of the rotation control unit 124d is pulled up integrally with the joint 124c via a fourth pivotal support D (see FIG. 13) pivotally supported by the joint 124c, and the other end of the rotation control unit 124d pushes up the protruding unit 123 in the direction of movement of the joint 124c, as shown in FIGS. 11 and 12. The protruding unit 123 is pushed up by a sixth pivotal support F pivotally supported by the rotation control unit 124d and the rotation guide unit 124e and rotates around a fifth pivotal support E pivotally supported by the first rotation unit 121 and the rotation guide unit 124e.

[0073] 13, the unloading assist device 1 can control the movement of the second pivoting part 122 in the unfolding direction FA at a predetermined angle relative to the first pivoting part 121 using the opening stopper 125, but cannot control the movement in the folding direction FB, which is opposite to the unfolding direction FA, by itself. Meanwhile, the second pivoting part 122 is supported by the floor edge part 2a, for example, by fitting the base fitting part 122c of the unloading assist device 1 in the second state to the floor edge part 2a. As a result, the second pivoting part 122 is supported so that the movement in the folding direction FB is at a predetermined angle relative to the first pivoting part 121 and does not move in either the unfolding direction FA or the folding direction FB. This improves the safety of working at heights when unloading heavy objects H.

[0074] (Second modified example of aerial work platform 100 and unloading assist device 1) <First locking portion 111> As shown in FIG. 14, the first locking portion 111 has a through-hole 111c and one or more base fitting portions (first base fitting portion 111d, second base fitting portion 111e, third base fitting portion 111d). The through-hole 111c is, for example, a hole-shaped portion drilled in the first locking portion 111 and open in the horizontal direction. The first base fitting portion 111d is, for example, a plate-shaped portion provided in a portion of the first locking portion 111 and standing in the vertical direction. The second base fitting portion 111e is, for example, a hole-shaped portion drilled in the first locking portion 111 and open in the vertical and horizontal directions, and has a reduced-diameter portion 111e' at its upper end, which is a hole-shaped portion with a reduced diameter.

[0075] <Lifting machine 3> In the lifting machine 3, for example, a base member 311b, which is a plate-shaped metal member, is joined to a base side surface 311a, which is a part of the first base 311, by a base member fixing portion 311c, such as a bolt. One or more base fitting-receiving portions (a first base fitting-receiving portion 311d, a second base fitting-receiving portion 311e) are provided on the base member 311b. The first base fitting-receiving portion 311d is, for example, a plate-shaped member fastened to the base member 311b by a bolt or the like. The second base fitting-receiving portion 311e is, for example, a flange-shaped member that protrudes horizontally and whose tip has a diameter enlarged in the vertical direction. The second base fitting-receiving portion 311e is, for example, a screw with a spiral groove cut in part, and may be fixed to the base member 311b by being screwed into the base side surface 311a and the base member 311b, or into the base member 311b alone, which have an insertion hole drilled in advance.

[0076] (Second modified example of the operation method of the aerial work platform 100 and the unloading assist device 1) The unloading assist device 1 can be attached to the first base 311 of the crane 3 by pushing it down from above the base side surface 311a as shown in Figures 14 and 15, for example, to engage the first engaging portion 111 with the base material 311b.

[0077] More specifically, for example, the second base fitting-receiving portion 311e is inserted into the reduced diameter portion 111e' of the second base fitting portion 111e to fit in. At this time, the first locking portion 111 is sandwiched between the base material 311b and the flange portion at the tip of the second base fitting-receiving portion 311e, and is therefore locked so as not to move in the horizontal direction.

[0078] Furthermore, the first base fitting portion 111d is fitted into the first base fitting-receiving portion 311d. At this time, the first locking portion 111 is sandwiched between the base material 311b and the first base fitting-receiving portion 311d, and is therefore locked so as not to move in the horizontal direction.

[0079] Furthermore, the substrate fixing portion 311c is inserted into the through hole 111c. At this time, the substrate fixing portion 311c does not hinder contact between the substrate 311b and the first locking portion 111. Furthermore, the contact between the through hole 111c and the substrate fixing portion 311c locks the first locking portion 111 so that it does not slide on the surface of the substrate 311b.

[0080] As described above, the unloading assist device 1 can be easily attached to the first base 311 of the crane 3 fixed on the work platform 2 by pushing it down from above the base side surface 311a to the base side surface 311a. In addition, the unloading assist device 1 can be easily removed from the first base 311 of the crane 3 without disassembling any components by pulling it up from the base material 311b. This improves the workability of working at heights when unloading heavy objects H.

[0081] Furthermore, since the unloading auxiliary device 1 does not require the attachment of a separate fastener when attaching it to the first base 311 of the lifting machine 3 fixed to the work floor 2, or the removal of the fastener when removing it from the first base 311, there is no risk of protrusions such as fasteners being left behind on the work floor 2. This makes it possible to improve the safety of working at heights when unloading heavy objects H.

[0082] According to this embodiment, the movable section 12 can be freely switched between a first state in which it is supported by the horizontal section 11 at a standby position on the horizontal section 11, and a second state in which it is supported by the horizontal section 11 while in contact with the heavy load H at the unloading position at the tip of the horizontal section 11. Therefore, the heavy load H can be pushed out to the unloading position on the horizontal section 11 via the movable section 12 without the center of gravity of the lifting machine 3 protruding outside the working platform 2 in a plan view, and the center of gravity of the working platform 2 can be prevented from moving outside the working platform 2 in a plan view. This improves the safety of working at heights when unloading the heavy load H.

[0083] Furthermore, according to this embodiment, the movable section 12 has a first rotating section 121, one end of which is rotatably supported by the horizontal section 11 at the standby position, and a second rotating section 122, one portion of which is rotatably supported by the other end of the first rotating section 121 and the other portion of which is detachably supported at the tip of the horizontal section 11. Therefore, by pushing the second rotating section 122 diagonally downward with the horizontal section 11 as its axis, the heavy object H can be pushed to the unloading position of the horizontal section 11, and it is easier for the worker to push the heavy object H by using his or her body weight compared to pushing it in a substantially horizontal direction. This improves the workability of working at heights when unloading the heavy object H.

[0084] Furthermore, according to this embodiment, the horizontal section 11 has the fitting receiving section 112a, into which the other section of the second rotating section 122 fits, provided at the unloading position. Therefore, the movable section 12, which receives the reaction force from the pushed-out heavy object H, can be reliably supported at the unloading position. This further improves the safety of working at heights when unloading the heavy object H.

[0085] Furthermore, according to this embodiment, the movable section 12 is supported by the horizontal section 11 so as to be movable in a substantially horizontal direction. Therefore, compared to when the movable section 12 rotates, it is easier to maintain balance even when the movable section 12 receives a reaction force from the heavy load H pushed out, and the heavy load H can be reliably pushed out to the unloading position on the horizontal section 11. This further improves the safety of working at heights when unloading the heavy load H.

[0086] Furthermore, according to this embodiment, the operating method of the unloading assist device 1 is to move the movable part 12, which is supported so as to be freely movable in a substantially horizontal direction from the horizontal part 11, from a first state in which it is supported on the horizontal part 11 at a standby position on the horizontal part 11, to a second state in which it is supported on the horizontal part 11 while contacting the heavy load H at an unloading position on the horizontal part 11, by moving the movable part 12 in a substantially horizontal direction. As a result, the heavy load H can be pushed to the unloading position on the horizontal part 11 without the center of gravity of the lifting machine 3 protruding outside the working platform 2 in a plan view, and the center of gravity of the working platform 2 can be prevented from moving outside the working platform 2 in a plan view. This improves the safety of working at heights when unloading the heavy load H.

[0087] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0088] 100 Aerial Work Platform 1 Unloading aids 11 Horizontal section 111 First locking portion 111a Stopper 111c through hole 111d 1st base fitting part 111e 2nd base fitting part 112 Second locking portion 112a Fitting receiving portion 113 Extension section 12 Moving parts 121 First rotating part 121h Guide hole 122 Second rotating part 122a Mating part 122b Handle 122c Pedestal fitting part 123 Protrusion 124 Ejection mechanism 124a First sliding part 124b Second sliding part 124c joint 124d Rotation control section 124e Rotating guide 125 Stopper 2 Work Platform 2a Floor edge 3 Lifting machine 31 Base 311 1st base 311a Base side 311b Base material 311c Base material fixing part 311d 1st base fitting receiving part 311e 2nd base fitting receiving part 312 Second base 313 Floating detection unit 314 Stop operation section 32 Support part 33 Arm 34 Hanging part O Unloading section F1, F2 moving direction A~F 1st axis branch ~ 6th axis branch FA development direction FB Folding Direction

Claims

1. A load-discharge assist device that is arranged on a work platform of an aerial work vehicle and assists in the descent of a heavy object suspended from an arm of a lifting machine arranged on the work platform from the work platform, a horizontal portion extending in a substantially horizontal direction; a movable portion movably supported from the horizontal portion; Equipped with The movable section is switchable between a first state in which it is supported by the horizontal section at a standby position on the horizontal section spaced apart from the tip of the horizontal section, and a second state in which it is supported by the horizontal section while pushing the heavy object outward from the outer edge of the work platform and making contact with it at a loading position on the horizontal section that is the tip. An unloading aid characterized by:

2. The movable part is a first rotation portion extending in one direction and having one end pivotally supported at the standby position from the horizontal portion; a second rotation section extending in one direction, a portion of which is pivotally supported from the other end of the first rotation section and another portion of which is detachably supported on the tip of the horizontal section in the second state; Having 2. The unloading assist device according to claim 1,

3. The horizontal portion has a fitting receiving portion, into which the other portion of the second rotating portion is fitted, provided at the unloading position.

3. The unloading assist device according to claim 2,

4. The movable portion is supported so as to be movable in the substantially horizontal direction from the horizontal portion.

2. The unloading assist device according to claim 1,

5. An unloading assist device according to any one of claims 1 to 4; a work platform of the aerial work vehicle to which the unloading assist device is fixed; Equipped with The tip of the unloading assist device is fixed to the outer edge of the work platform. A high altitude work platform characterized by:

6. 1. A method for operating a load-unloading assist device, which is arranged on a work platform of an aerial work vehicle, to assist in the descent of a heavy object suspended from an arm of a lifting machine arranged on the work platform from the work platform, comprising: A movable section movably supported from a horizontal section extending in a substantially horizontal direction is switched from a first state in which the movable section is supported by the horizontal section at a standby position on the horizontal section spaced apart from the tip of the horizontal section to a second state in which the heavy object is pushed outward from the outer edge of the work platform and in contact with the outer edge at a loading position on the horizontal section that is the tip of the horizontal section and supported by the horizontal section. A method for operating an unloading assist device, comprising:

Images