JP2024007641A - Work bench with hand nipping prevention mechanism for high elevation work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism to protect a hand other than the one holding the control lever from obstacles, on a workbench when a worker performs the lifting operation using the operating lever on the workbench for high places.

SOLUTION: A workbench 1 comprises a vertical frame 3 arranged around a work floor 2 for a worker, a handrail 4 constructed between the upper end parts of adjacent vertical frames 3, 3, and a control lever 6 to control a lifting operation inside the space divided by the vertical frame 3 and the handrail 4. A handle 7 with a detector is installed at the position below the handrail 4 inside the workbench, and the detector has the function to switch between enabling and disabling lifting operation of the work bench 1 using the operation lever 6 and enables the lifting operation using the operation lever 6 when the worker grasps the lever.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention prevents a situation in which when a worker performs a lifting operation using a control lever on a high-altitude workbench, the hand on the opposite side of the hand operating the control lever gets caught between a structure or installed equipment. This invention relates to a workbench with a mechanism to prevent hand pinching for working at high places.

A workbench (basket) is supported on a moving vehicle so that it can be raised and lowered vertically, and is used by workers to work at heights.The workbench is mainly operated by operating a control lever on a control panel installed inside the workbench. By doing so, it goes up and down (see Patent Document 1). In order to ensure the safety and reliability of operation using the operating lever, there is also a control method that enables operating the operating lever only when a foot switch installed on the work surface of the workbench is stepped on. (See Patent Document 2).

Since the control lever is operated by the worker with one hand, in order to ensure the worker's own stability when going up and down the work platform, the worker tries to grasp the handrail with the other hand, so There is a risk that the hand holding the product may come into contact with or collide with obstacles such as a constructed structure (framework) or installed equipment.

Workers who are operating the control lever while holding the handrail are likely to face the above-mentioned dangers mainly when the work platform is being raised. It is necessary to take measures to avoid contact.

One way to do this is to place a movable handrail that can move along the handrail inside the original handrail that is part of the workbench, and use the original handrail as a guard member to prevent obstacles from reaching the hand. There is a method to avoid hitting the handrail (see Patent Document 3) and a method to attach a guard member to the handrail that moves up and down on the outside of the handrail (see Patent Document 4). However, there is no guarantee that the hand other than the hand that grips the operating lever will always be able to grip a guard member other than the handrail at a moment's notice.

On the other hand, there is a method in which the operator grasps the operating lever and continues to press it with any finger of the same hand only when the operator is about to operate it, thereby enabling (effective) operation using the operating lever (Patent Document 5) reference).

JP-A-2003-73094 (Claim 1, paragraphs 0012 to 0017, Figure 2) JP-A-62-205995 (Claim 1, Figure 3) JP 2021-138504 (Claim 1, paragraphs 0018 to 0040, Figures 1 to 8) JP2021-88433A (Claim 1, paragraphs 0018 to 0030, Figures 1 and 2) JP 2021-31293 A (Claim 1, paragraphs 0010-0016, 0025, 0033, 0050-0059, Figure 3)

However, Patent Document 5 merely equips the operating lever with an additional switch for safety in order to prevent erroneous operation using only the operating lever, and the hand that is not operating the operating lever cannot be used against the handrail. There is no guarantee that the hand other than the hand holding the control lever can be reliably protected from obstacles, as this is not a guidance measure for evacuating from obstacles.

In view of the above-mentioned background, the present invention proposes a workbench with a hand pinch prevention mechanism for high-place work, which makes it possible to protect hands other than the hand holding the operating lever from obstacles.

The work platform with a hand pinch prevention mechanism for high-place work according to the invention according to claim 1 is supported on a traveling vehicle so as to be vertically movable up and down, and spaced apart in the circumferential direction around a work floor on which a worker is placed. Vertical frames that are arranged, a handrail installed between the upper ends of the adjacent vertical frames, and an operating lever for controlling at least a lifting operation inside a space partitioned by the vertical frame and the handrail. On the workbench for working at heights,
When the operating lever is held by the worker at a position inside the workbench below the handrail, switching between a state in which the raising operation of the workbench is possible and a state in which it is impossible; A constituent requirement is that a handle equipped with a detector that enables the lifting operation using the lever is attached.

There are two types of traveling vehicles (high-altitude work vehicles) that support workbenches: tire type in which tires roll on the road surface, and crawler type in which crawlers roll. There are two types of vehicles: truck-mounted and self-propelled. Lifting devices that support the workbench in a vertically movable manner include a boom type (hydraulic cylinder type) that moves up and down by extending and contracting in the axial direction, or a digging (telescopic) type, and a vertical lifting device that moves up and down by extending and contracting in the vertical direction like a pantograph. (scissor type) etc. "Elevating and lowering freely" refers to being able to move up and down mainly in the vertical direction, but also includes movement in the vertical direction accompanied by movement in the horizontal direction.

As shown in Figure 1-(a), the workbench 1 basically consists of a workfloor 2, a plurality of vertical frames 3 fixed along the periphery of the workfloor 2, and support at the upper end of the vertical frames 3. The vertical frame 3 and the handrail 4 partition the inside and outside of the workbench 1. A horizontal frame or the like may be constructed between the adjacent vertical frames 3, or a door or the like may be installed. An operation panel 5 equipped with an operation lever 6 is mounted inside the workbench 1. The handrail 4 can be grasped by the worker when the operation lever 6 is not used to raise the workbench 1 .

Since the operating lever 6 is held by the operator at least when the workbench 1 is being raised, the entire operating lever 6 must be positioned below the handrail 4 as shown in FIG. No part of the hand gripping the operating lever 6 protrudes above the upper surface of the handrail 4. The handrails 4 are arranged continuously or intermittently in the circumferential direction of the workbench 1 (workfloor 2).

"Controlling at least the raising operation" means that the operating lever 6 may control not only the raising of the workbench 1 but also its lowering or lowering and other operations. "Controlling" means that the operating lever 6 is pushed to the upward operating side or is pushed down to support the workbench 1 based on commands from a controller built into the operating panel 5, etc. Refers to the control of the controller by the operation lever 6 when the lifting device 11 (the drive unit thereof) raises the workbench 1 (operates to raise it). When the operating lever 6 is operated, a signal for a lifting operation is transmitted from the operating lever 6 to the controller, and a command from the controller based on the signal is transmitted to the lifting device 11. Note that the control of raising the workbench 1 by the operating lever 6 may also be simply referred to as a raising operation.

A handle 7 equipped with a detector such as a sensor that enables a lifting operation using an operating lever 6 is mounted inside the workbench 1 at a position below the handrail 4. Since the handle 7 is also held by the worker at least when the workbench 1 is being raised, it is placed below the handrail 4 so that obstacles do not come into contact with the hand that is gripping the handle 7 when the workbench 1 is being raised. Also, it does not protrude above handrail 4.

The handle 7 is held by the hand (one hand) opposite to the hand (one hand) that grips the operating lever 6 while the operator is operating the operating lever 6. It does not matter which hand holds the operating lever 6 and the handle 7. When the worker grasps the handle 7, the worker grasps the operating lever 6 with one hand and the handle 7 with the other hand, so both hands of the worker are required to perform the upward operation using the operating lever 6. In order to make it possible, two places on the workbench 1 are grasped at the same time.

"Enable the raising operation by the operating lever 6" means that when the operating lever 6 is operated to the ascending operation side, the handle 7 is grasped at the same time, and the detector detects that the handle 7 is grasped. is detected and the controller issues a "rise" command to the lifting device 11 (by turning on a switch to be described later). The detector detects changes in pressure and the like when the handle 7 is gripped, as will be described later.

Therefore, in order to enable the raising operation using the operating lever 6 with one hand, it is essential to grasp the handle 7 with the detector with the other hand. It is necessary to grip the operating lever 6 with one hand and at the same time grip the detector-equipped handle 7 with the other hand. As a result, when the worker raises the workbench 1, either hand does not grasp the handrail 4, and the handle 7 is used as a guide for retracting the hand other than the hand operating the operating lever 6 from the handrail 4. It becomes a strategy.

By placing both hands of the worker in a state where they simultaneously grasp the control lever 6 and the handle 7, which are part of the workbench 1, the worker inevitably grasps the control lever 6 while holding the handrail 4. This means that the user takes a posture (position) of gripping the handle 7 instead of the grip 7. Since the operating lever 6 and the handle 7 are located below the handrail, even when the work platform 1 rises and an obstacle relatively descends, the obstacle will not come into contact with or collide with the worker's hand. This ensures that the hands other than the hand holding the operating lever 6 are protected from obstacles, and the safety of the worker is ensured.

The detector on the handle 7 has the function of switching between a state in which the operation lever 6 can be used to raise the work platform 1 and a state in which it is not possible. Enables the ascending operation by step 6. That is, when the detector is not functioning, the upward operation by only the operating lever 6 is restricted, and the operating lever 6 is kept in a restrained (locked) state.

The function of the detector for switching between a state in which raising the workbench 1 using the operating lever 6 is possible and a state in which it is not possible is achieved by, for example, a detector built in the handle 7 itself, or in any part of the handle 7, or affixed to the surface. When the piezoelectric element or other pressure sensor or contact sensor detects a change in pressure or the like when the handle 7 is gripped, it is detected that the handle 7 is gripped, and the signal at this detection is raised by the operating lever 6. It means to enable operation (control). There are other types of detectors (capacitive touch panels) that detect changes in capacitance due to a weak current generated when a finger directly contacts the surface of the detector.

The signal detected by the detector turns on the switch 7a of the handle 7 (detector), which enables the upward operation using the operating lever 6, as shown in Figure 4-(b), and the detector detects changes in pressure, etc. When not in use, switch 7a is kept OFF. When the switch 7a of the handle 7 (detector) is turned on, a command for a lifting operation is transmitted from the controller to (the driving portion of) the lifting device 11.

The switch 7a of the handle 7 is connected in series with a command from the controller using the operating lever 6 to raise and lower the elevator device 11. When the switch 7a of the handle 7 is kept OFF, the operation of the operation lever 6 is not effective, or even if the operation lever 6 is operated, the command from the controller is not transmitted to the lifting device 11, and the workbench 1 will never rise.

Since the handle 7 only needs to have the function of switching between a state in which the operating lever 6 can be used to raise the workbench 1 and a state in which it is not possible, a secondary switch 8 that performs the same function in place of the detector or in conjunction with the detector is provided. It can also be provided alongside the handle 7 (Claim 2). A "secondary switch that performs the same function as the detector" is used to switch between a state in which raising the work platform 1 using the operating lever 6 is possible and a state in which it is not possible. This means that the secondary switch 8, such as the push button switch shown in FIG. 3-(b), has the function of enabling the raising operation by the lever 6.

"In place of the detector" means that the secondary switch 8 plays a role in place of the detector, and regardless of whether the detector detects the above-mentioned change in pressure, etc., the secondary switch 8 This means that when the lever is pressed or otherwise operated, the raising operation using the operating lever 6 becomes possible.

"Along with the detector" means that the detector and the secondary switch 8 are used together, and the detector and the secondary switch 8 limit (restrict) the upward operation by the operating lever 6 to two stages. That is, when the secondary switch 8 is operated after the detector detects the above-mentioned changes in pressure and capacitance, etc., the switch on the handle 7 (detector) is activated as shown in FIG. 5-(b). 7a and the secondary switch 8 are turned on, and for the first time, the operating lever 6 becomes capable of upward operation. The form of the secondary switch 8 is not limited, and a changeover switch or the like may be used in addition to a push button switch.

When the secondary switch 8 is provided, the workbench 1 is supported on the traveling vehicle 10 so as to be vertically movable and arranged at intervals in the circumferential direction around the workfloor 2 on which the worker is placed. A vertical frame 3, a handrail 4 constructed between the upper ends of the adjacent vertical frames 3 and 3, and an operation for controlling at least a lifting operation inside the space partitioned by the vertical frame 3 and the handrail 4. and a lever 6 (claim 2). When the operating lever 6 is held by the operator at a position below the handrail 4 inside the work platform 1, the operation lever 6 switches between a state in which raising the work platform 1 is possible and a state in which it is not possible. A handle equipped with a detector that enables the lifting operation is attached (Claim 2).

Then, while the handle 7 is held by the operator, the state in which the work platform 1 can be raised by the operating lever 6 is switched between a possible state and the disabled state, and the raising operation by the operating lever 6 is performed while the handle 7 is being held by the operator. A secondary switch 8 is provided on the handle 7 together with or in place of the detector that enables the raising operation by the operating lever 6 (Claim 2). "The function of enabling the raising operation by the operation lever 6" is performed by the above-mentioned detector, the secondary switch 8, or the detector and the secondary switch 8.

``A handle that has the function of enabling the lifting operation'' means ``a handle that switches between a state where the raising operation of the work platform 1 using the operating lever 6 is possible and a disabled state, and when the handle 7 is held by the worker ( This means that the handle 7 is equipped with at least one of the above-mentioned detector and the secondary switch 8, which has the function of "enabling the raising operation using the operating lever 6".

Since the handle 7 has at least the secondary switch 8, unless the secondary switch 8 is operated, the switch of the operating lever 6 is kept OFF and the operation using the operating lever 6 is ineffective. The detector of the handle 7, or the detector and the secondary switch 8, are connected in series with the command of the lifting operation to the lifting device 11 from the controller using the operating lever 6, as shown in FIG. 5-(b). .

In claim 2, the handle 7 is provided with a secondary switch 8 together with a detector, and when the secondary switch 8 is operated after the detector detects a change in pressure, etc., the raising by the operating lever 6 is performed as described above. Since the operation can be limited (locked) to two stages, the reliability and safety of the raising operation using the operating lever 6 are increased.

In addition, to improve the reliability and safety of the lifting operation using the operating lever 6, it is also possible to increase the reliability and safety of the lifting operation using the operating lever 6 when the operator steps on the work floor 2. This is also possible by installing a foot switch 9 that enables the operation (claim 3).

In addition to the detector attached to the handle 7, or the detector and the secondary switch 8, there is a foot switch 9 on the work floor 2 that enables raising operation by the operating lever 6 (only) when stepped on by the worker. By being equipped with this, the detector etc. and the foot switch 9 are in a state of restricting (restricting) the upward operation by the operating lever 6. Therefore, as shown in FIG. 7-(b), the raising operation using the operating lever 6 can be limited (locked) to three stages, thereby further increasing the reliability and safety of the raising operation using the operating lever 6.

In this case, the detector detects a change in pressure etc. as shown in Figure 6-(b), or the secondary switch 8 is operated, or the detector detects a change in pressure etc. as shown in Figure 7-(b). By detecting changes in pressure, etc., and stepping on the foot switch 9 after operating the secondary switch 8, both the switch on the handle 7 (detector or secondary switch 8) and the foot switch 9 are turned on. , and the raising operation by the operation lever 6 becomes possible for the first time. In this way, when the detector on the handle 7 and the secondary switch 8 are used together, the raising operation by the operating lever 6 is limited (locked) to three stages.

It is held by a worker at a position below the handrail on the inside of the workbench, and switches between a state in which the worktable can be raised using a control lever and a state in which it is not possible to raise the worktable. Since the handle is equipped with a detector that enables operation, the operator can take a posture of simultaneously grasping the operating lever and the handle, which are part of the workbench, with both hands. Since the control lever and handle are located below the handrail, even when the work platform rises, obstacles are prevented from coming into contact with or colliding with the worker's hands, and hands other than the hand holding the control lever are prevented. It is possible to reliably protect workers from obstacles and ensure worker safety.

(a) is an elevational view of the traveling vehicle showing how the lifting device supporting the workbench is extended from the contracted state and the workbench is raised, and (b) is a side view of (a). FIG. 2 is a perspective view illustrating an example of the arrangement of an operation panel having an operation device and an operation lever that controls the overall operation of the traveling vehicle, which is mounted inside the workbench, and a handle. (a) is a perspective view showing an example of manufacturing a handle with a detector, and (b) is a perspective view showing an example of manufacturing a handle with a secondary switch attached thereto. (a) is a schematic diagram showing the relationship between the flow of signals to the lifting device that should be raised by the operating lever, the lifting operation by the lifting device, and the switch on the handle, and (b) is the signal from the operating lever in (a). FIG. 2 is a block diagram showing how the handle is switched by a switch on the handle. (a) is a schematic diagram showing the relationship between the flow of signals to the lifting device that is to be raised by the operating lever, the lifting operation by the lifting device, and the switch on the handle and the secondary switch; FIG. 3 is a block diagram showing how a signal from an operating lever is switched between a switch on the handle and a secondary switch. (a) is a schematic diagram showing the relationship between the flow of signals to the lifting device to be operated by the operating lever, the lifting operation by the lifting device, the foot switch and the switch on the handle, and (b) is the operation of (a). FIG. 3 is a block diagram showing an example of how a signal from a lever is switched between a foot switch and a switch on the handle. (a) is a schematic diagram showing the relationship between the flow of signals to the lifting device that is to be raised by the operating lever, the lifting operation by the lifting device, and the switch on the handle that is equipped with a foot switch and a secondary switch; (b) ) is a block diagram showing an example of how the signal from the operating lever in (a) is switched by a foot switch, a switch on the handle, etc.;

FIGS. 1-(a) and (b) show a configuration example of a work platform 1 for high-altitude work, which is supported on a traveling vehicle 10 so as to be vertically movable and is equipped with an operating lever 6 on the inside that controls at least a lifting operation. shows.

The workbench 1 is constructed between a workfloor 2 on which a worker stands, vertical frames 3 arranged at intervals in the circumferential direction around the workbench 2, and the upper ends of adjacent vertical frames 3, 3. As shown in FIG. 2, an operation panel 5 including an operation lever 6 is mounted inside the workbench 2, as shown in FIG. The workbench 1 is placed and fixed on a telescopic lifting device 11 supported on a traveling vehicle 10 as shown in FIG. 1-(a), for example. The workbench 1 is supported by the traveling vehicle 10 so that it can be raised and lowered as the lifting device 11 expands and contracts.

As shown in FIG. 2, an operating device 12 and an operating panel 5 are installed inside the workbench 1 to control forward, backward, and other overall operations of the vehicle 10. The entire operation lever 6 is located below the handrail 4 so that when the operator is holding it, the operator's hand does not come into contact with any obstacles while the workbench 1 is being raised.

Inside the workbench 1, for example, on the front or side of the operating device 12, there is a control lever 6 that switches between a possible state and a disabled state for raising the workbench 1. A handle 7 equipped with a detector such as a sensor that enables the lifting operation by the handle 7 is attached. The entire handle 7 is also located below the handrail 4 so that when the operator is holding it, his hand will not come into contact with any obstacles while the workbench 1 is being raised.

The detector is integrated with or attached to the surface of any part (section) of the handle 7 that is held by the operator. As the detector, for example, a sensor such as a pressure sensor that can detect a change in some physical quantity when the handle 7 is gripped with one hand, and can detect that the handle 7 is gripped, is used.

FIG. 3-(a) shows an example of manufacturing a handle 7 equipped with a detector. This handle 7 has two U-shaped handle members 71, 71 placed in parallel at an appropriate distance, and both handle members 71, 71 are connected to a plate 72 which becomes a part of the operating device 12, or a case having a plate 72. It is configured to be fixed to 73 etc. The handle members 71, 71 may be combined so that when gripped by an operator with one hand, for example, at least one of them is elastically deformed so that they approach each other or come into contact with each other.

In this case, the above-mentioned sensor or the like that detects a change in pressure or the like is embedded or attached to the surface of at least one of the handle members 71 when the handle members 71, 71 are gripped. A sensor that detects contact when at least one of the handle members 71, 71 parallel to the detector is elastically deformed and the handle members 71, 71 (detectors) contact each other, or a sensor that conducts electricity upon contact, etc. It is also possible to use a detector and turn on the switch 7a of the handle 7 at the time of detection, and the detector may also serve as the switch 7a.

In FIG. 3-(a), one handle 7 is constructed by connecting two handle materials 71, 71 in parallel to the plate 72, but as shown in FIG. 3-(b), one handle material 71 may be used as the handle 7 as is. In that case, a sensor for detecting pressure is embedded or attached to the surface of one handle member 71.

In the example of FIG. 3-(a), the two handle members 71, 71 are gripped, and when the detector detects a change in pressure etc., the switch 7a of the handle 7 shown in FIG. 3-(b) is turned on. When the operating lever 6 is operated to the raising operation side, a command to the lifting device 11 by the operating lever 6 becomes effective, and the work platform 1 is raised.

In FIG. 3-(b), one handle member 71 is connected to a plate 72 of a case 73 that is a part of the operating device 12 or is separate, and a push button switch etc. is attached to the side of the case 73 other than the plate 72. An example is shown in which a secondary switch 8 is installed, and the secondary switch 8 has a function of enabling the operation lever 6 to raise the work platform 1 together with the detector or in place of the detector. .

When the secondary switch 8 replaces the detector and enables the raising operation using the operating lever 6, the example shown in FIG. Similarly, it functions as a switch 7a of the handle 7 (detector). In this case, the switch 7a shown in FIG. 4-(b) is replaced by the secondary switch 8.

When the secondary switch 8 together with the detector enables the raising operation by the operating lever 6, the switch 7a of the handle 7 and the secondary switch 8 move the operating lever 6 into two stages as shown in FIG. 5-(b). enable ascending operation. In FIG. 5-(b), the order of the switch 7a and the secondary switch 8 does not matter. In this case, when the switch 7a of the handle 7 is turned ON and the secondary switch 8 is turned ON, the raising operation using the operating lever 6 becomes possible. The ascending operation by step 6 is not possible.

In the example shown in FIG. 3-(b), the handle 7 (handle material 71) is gripped, the detector detects a change in pressure, etc., and the secondary switch 8 is operated, resulting in the grip shown in FIG. 5-(b). Since both the switch 7a of the handle 7 and the secondary switch 8 shown in FIG. rises.

In Figure 6-(a), a foot switch 9 is installed on the work floor 2 of the work platform 1, which enables the operation lever 6 to raise the work platform 1 (only) when stepped on by the operator. The relationship between the foot switch 9 and the switch 7a of the handle 7, and the operating lever 6 and the lifting device 11 is shown when the switch 7a is turned on. Basically, the order of the foot switch 9 and the switch 7a is as shown in FIG. 6-(b). However, on the circuit, the control lever 6 and foot switch 9 do not necessarily need to be connected in series as shown in the figure, but may be connected in parallel, and only when the signals of both are confirmed on the program. A raising operation using the operating lever 6 may be made possible. In addition, the foot switch 9 may be connected to a motor controller equipped with a fail-safe function, and the motor rotation may be controlled only when a signal is input, and a rise operation may be made possible by a rise signal.

In the case of the example shown in FIG. 6-(b), when the foot switch 9 is turned ON and the switch 7a of the handle 7 is turned ON, the raising operation using the operating lever 6 becomes possible. Unless it is turned ON, the raising operation by the operating lever 6 will not be possible.

In this example, when the foot switch 9 is stepped on, the handle 7 (handle material 71) is grasped, and the detector detects changes in pressure, etc., and the foot switch 9 and handle shown in FIG. 6-(b) are Since the switches 7a of 7 are both turned on, when the operating lever 6 is operated to the raising operation side, the command to the lifting device 11 by the operating lever 6 becomes effective, and the work platform 1 is raised.

FIG. 7-(a) shows the foot switch 9, the handle 7, the operating lever 6, and the lifting device 11 when the handle 7 shown in FIG. 6-(a) is replaced with the handle 7 shown in FIG. 3-(b). shows the relationship between In this example, when the foot switch 9 is stepped on, the handle 7 is grasped, and the secondary switch 8 is operated, the foot switch 9 and the switch 7a of the handle 7 shown in FIG. The secondary switch 8 is turned on, and the workbench 1 is raised as the operating lever 6 is operated to the upward operation side. Even in this example, the operating lever 6, the foot switch 9, the switch 7a of the handle 7, and the secondary switch 8 are not necessarily connected in series, but may be connected in parallel.

1... Workbench for working at heights,
2...Working floor,
3... Vertical frame, 4... Handrail,
5... Operation panel, 6... Operation lever,
7... Handle, 7a... Switch, 71... Handle material, 72... Plate, 73... Case,
8...Secondary switch,
9...Foot switch,
10... Running vehicle, 11... Elevating device, 12... Operating device.

Claims (3)

Vertical frames supported vertically on a traveling vehicle so as to be vertically movable and arranged at intervals in the circumferential direction around a work floor on which a worker stands; and a handrail constructed between the upper ends of adjacent vertical frames. and a work platform for high-altitude work, comprising at least an operating lever for controlling a lifting operation inside a space partitioned by the vertical frame and the handrail,
When the operating lever is held by the worker at a position inside the workbench below the handrail, switching between a state in which the raising operation of the workbench is possible and a state in which it is impossible; A workbench with a hand pinch prevention mechanism for working at high places, characterized in that a handle is equipped with a detector that enables the lifting operation using a lever. Vertical frames supported vertically on a traveling vehicle so as to be vertically movable and arranged at intervals in the circumferential direction around a work floor on which a worker stands; and a handrail constructed between the upper ends of adjacent vertical frames. and a work platform for high-altitude work, comprising at least an operating lever for controlling a lifting operation inside a space partitioned by the vertical frame and the handrail,
When the operating lever is held by the worker at a position inside the workbench below the handrail, switching between a state in which the raising operation of the workbench is possible and a state in which it is impossible; A handle is attached that has a function of enabling the lifting operation using a lever,
Switching between a state in which raising the workbench using the operating lever is enabled and a disabling state while the handle is being grasped, and enabling the ascending operation using the operating lever when the handle is being grasped by the operator. A hand pinch prevention mechanism for working at heights, characterized in that a secondary switch is provided on the handle to enable the raising operation by the operating lever, together with or in place of the detector. Workbench with. Claim 1 or Claim 2, characterized in that a foot switch is mounted on the work floor to enable the raising operation by the operating lever when stepped on by the worker. The mentioned workbench with a hand pinch prevention mechanism for working at high places.

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