Safety device for working at height and method for working at height

Abstract

To reliably prevent an abnormal approach of a bucket to the inner wall of a tunnel even in the tunnel with a bright ceiling and a lot of noise, which may lead to a contact accident of a worker or damage to the tunnel and its equipment.SOLUTION: Four upper corners of a bucket 11 are equipped with upward detection rods 13a-13d and horizontal detection rods 14a-14h. When a tip 13a1-13d1, 14a1-14h1 of any of the detection rods 13a-13d, 14a-14h contacts the inner wall of a tunnel, the detection rods bend with a bending mechanism 15 interposed between the tip 13a1-13d1, 14a1-14h1 and a base 13a2-13d2, 14a2-14h2 at the fulcrum, and the bending is detected by a detection rod bending detection unit 15D built in the bending mechanism 15. Detection of bending of the detection rods 13a-13d, 14a-14h limits the operation of the bucket 11 to moving only in the downward direction or in the direction opposite to that in which contact with the tunnel inner wall is detected.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] An embodiment of the present invention relates to a high-altitude working apparatus with a safety device and a high-altitude working method. [Background technology]

[0002] For example, when inspecting or maintaining high-altitude areas from the ceiling to the side walls of a tunnel through which vehicles pass, a vehicle-operated work platform is used. A vehicle-operated work platform is equipped with a bucket that can carry a worker and can be moved up, down, left and right. The worker operates a bucket operating unit in the bucket to move the bucket to a desired position and perform work on the ceiling, side walls, etc.

[0003] However, for example, if a worker, when moving a bucket, misjudges the distance from the worker on the bucket to the ceiling or side wall (tunnel inner wall) or makes a mistake in the movement operation itself and brings the bucket too close to the tunnel inner wall, it could lead to an accident where the worker comes into contact with the inner wall or damage to the tunnel or its facilities.

[0004] Conventionally, a safety device for aerial work vehicles has been devised in which an obstacle detection unit extending upward is installed on the bucket of the aerial work vehicle, and when the obstacle detection unit hits the inner wall of a tunnel, an alarm buzzer and alarm lamp are activated, alerting the worker with sound and light that the bucket is approaching abnormally close to the inner wall of the tunnel. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-088351 A Summary of the Invention [Problem to be solved by the invention]

[0006] In tunnels where vehicles are passing through, especially on trunk roads and expressways, it is difficult to close all roads to traffic to carry out work, so work is carried out by closing one lane in each direction if there is two-way traffic, or by closing some of the multiple lanes.

[0007] In these types of tunnels, lighting and exhaust equipment are installed near the ceiling, making the ceiling bright and well-ventilated, but there is a lot of noise, including the echoes of high-speed trains and the sound of ventilation fans.

[0008] For this reason, in a safety device for aerial work vehicles that alerts the worker of the abnormal approach of the bucket to the inner wall of a tunnel with sound and light using an alarm buzzer and alarm lamp, the sound and light alerts are difficult to convey, and there is a risk that the worker operating the bucket will not be able to immediately stop the bucket's movement.

[0009] The problem that the present invention aims to solve is to provide an aerial work device with a safety device and an aerial work method that can reliably prevent the bucket from approaching abnormally close to the inner wall of a tunnel, which could lead to a collision accident between the worker and the tunnel or damage to the tunnel or its facilities, even in a tunnel with a brightly lit ceiling and a very noisy ceiling. [Means for solving the problem]

[0010] In an embodiment The first aspect Aerial work equipment with safety devices is A bucket for a worker to ride on and perform work on a work object; A bucket control means for moving the bucket to an arbitrary position; an upward detection rod that is a rod-shaped body provided on an upper edge of the bucket facing upward and detects contact with an obstacle by bending the rod-shaped body; a horizontal detection rod that is a rod-shaped body that is provided on an upper edge of the bucket in a horizontal direction toward the outside of the bucket and detects contact with an obstacle by bending the rod-shaped body; When the upward detection rod or the horizontal detection rod detects contact with the obstacle, the direction in which the bucket is moved by the bucket control means is limited to a direction opposite to the direction in which the contact with the obstacle was detected. Move and a movement limiting means. The high altitude work apparatus with a safety device according to the second aspect of the embodiment is as follows: A bucket for a worker to ride on and perform work on a work object; A bucket control means for moving the bucket to an arbitrary position; an upward detection rod that is a rod-shaped body provided on an upper edge of the bucket facing upward and detects contact with an obstacle by bending the rod-shaped body; a horizontal detection rod that is a rod-shaped body that is provided on an upper edge of the bucket in a horizontal direction toward the outside of the bucket and detects contact with an obstacle by bending the rod-shaped body; and a movement limiting means for limiting the direction in which the bucket is moved by the bucket control means to a downward direction when contact with the obstacle is detected by the upward detection rod or the horizontal detection rod. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view showing the external configuration of a vehicle 10 for working at height with a safety device according to an embodiment. [Diagram 2] 1 is a perspective view showing a schematic configuration of a bucket 11 of a vehicle for working at height 10 and detection rods 13a to 13d and 14a to 14h provided at the four corners of an upper part of the bucket 11. FIG. [Diagram 3] 1 is a plan view showing a schematic configuration of a bucket 11 of a vehicle for working at height 10 and detection rods 14a to 14h provided horizontally at the four corners of an upper portion of the bucket 11. FIG. [Figure 4] 1 is a side view showing a schematic configuration of a bucket 11 of a vehicle for working at height 10, detection rods 13a, 13b and 14a, 14d provided on an upper part of the bucket 11, and light projection units 16a, 16b provided on a lower part of the bucket 11. FIG. [Diagram 5] 3 is a diagram showing a schematic configuration of the bending function of detection rods 13a to 13d and 14a to 14h. FIG. [Figure 6] 4 is a side view showing a schematic configuration of a bending mechanism 15 and a folding mechanism 15B of the detection rods 13a to 13d and 14a to 14h. FIG. [Figure 7] 4 is a plan view showing a schematic configuration of a bending mechanism 15 and a folding mechanism 15B of the detection rods 13a to 13d and 14a to 14h. FIG. [Figure 8] 4 is a diagram showing a configuration example of a detection rod bending detection section 15D built into bending mechanism 15 of detection rods 13a to 13d and 14a to 14h. FIG. [Figure 9] 2 is a block diagram showing the configuration of a bucket / boom control device 20 centered around a control unit 21 provided together with an operation unit 12 of a bucket 11. FIG. [Figure 10] 4 is a flowchart showing a bucket / boom control process executed by a bucket / boom control device 20 of the safety device-equipped aerial work platform vehicle 10. [Figure 11] 1 is a plan view showing a state in which the detection rods 14a, 14h come into contact with the side wall TS of the tunnel and are bent as the bucket 11 of the vehicle for working at height 10 moves. FIG. [Figure 12] 1 is a side view showing a state in which projected light L from light projecting units 16a to 16d forms light points Pa to Pd on a road R inside a tunnel as a bucket 11 of a vehicle for working at high altitude 10 moves. FIG. [Figure 13] 13 is a side view showing a schematic diagram of a storage procedure using a bending mechanism 15 and a folding mechanism 15B of the detection rods 13a, 13b provided at the four corners of the upper part of the bucket 11 facing upward. FIG. [Figure 14] 1 is a plan view showing a schematic diagram of a storage procedure using a bending mechanism 15 and a folding mechanism 15B of detection rods 14a to 14h provided horizontally at the four corners of the upper part of a bucket 11. FIG. [Figure 15] 13 is a perspective view showing a schematic diagram of a storage function of another embodiment of the detection rods 13a to 13d provided facing upward at the four corners of the upper part of the bucket 11. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of an aerial working device with a safety device will be described with reference to the drawings.

[0013] FIG. 1 is a perspective view showing the external configuration of a vehicle 10 for working at height with a safety device according to an embodiment.

[0014] FIG. 2 is a perspective view showing a schematic configuration of bucket 11 of vehicle for working at height 10 and detection rods 13a to 13d and 14a to 14h provided at the four corners of the upper part of bucket 11. As shown in FIG.

[0015] FIG. 3 is a plan view showing a schematic configuration of bucket 11 of vehicle for working at height 10 and detection rods 14a to 14h provided horizontally at the four corners of the upper part of bucket 11. As shown in FIG.

[0016] FIG. 4 is a side view showing a schematic configuration of bucket 11 of vehicle for working at height 10, detection rods 13a, 13b and 14a, 14d provided on the upper part of bucket 11, and light projection units 16a, 16b provided on the lower part of bucket 11.

[0017] 1, the vehicle for working at height is used for work at high altitudes inside a tunnel on a highway, and is equipped with a box-shaped bucket 11 on which workers W1, W2 are placed, and a boom 10B which moves the bucket 11 to any position by raising or lowering it or moving it left or right or by rotating it. The bucket 11 is rotated by a rotation mechanism including an electric motor etc. which is provided between the attachment part of the tip of the boom 10B to the bucket 11.

[0018] The bucket 11 is provided with an operation unit 12 for performing operations for operating the bucket 11 and the boom 10B and for turning on / off the power of the detection rods 13a-13d, 14a-14h. The detection rods 13a-13d, 14a-14h have a function of detecting contact with the inner wall of the tunnel (obstacle) by bending the detection rods 13a-13d, 14a-14h when the bucket 11 is being moved within the tunnel.

[0019] Workers W1, W2 riding on the bucket 11 operate the operating unit 12 to move the bucket 11 to any position and perform installation, removal, maintenance, inspection, etc., on the tunnel inner wall, for example, extending from the tunnel ceiling TC to the side wall TS.

[0020] The supervisor WR on the road R monitors the aerial work vehicle 10 and its surroundings, and plays a role in preventing dangers arising from the work status of the workers W1, W2 in the bucket 11 and their relationship with vehicles traveling nearby.

[0021] Bucket 11 is provided with detection rods (upward detection rods) 13a-13d extending vertically and detection rods (horizontal detection rods) 14a-14h extending horizontally outward at the four corners of its upper part. The vertical detection rods 13a-13d are provided in the direction in which the vertical edges of the four corners of bucket 11 extend upward, and the horizontal detection rods 14a-14h are provided in pairs at each of the horizontal edges that intersect at right angles at the four corners of the upper part of bucket 11 and extend directly outward from bucket 11.

[0022] FIG. 5 is a diagram showing a schematic configuration of the bending function of the detection rods 13a to 13d and 14a to 14h.

[0023] FIG. 6 is a side view showing a schematic configuration of the bending mechanism 15 and the folding mechanism 15B of the detection rods 13a to 13d and 14a to 14h.

[0024] FIG. 7 is a plan view showing a schematic configuration of bending mechanism 15 and folding mechanism 15B of detection rods 13a to 13d and 14a to 14h.

[0025] In Figs. 5 to 7, the detection rods 13a to 13d and 14a to 14h all have the same configuration, so only one detection rod 13a will be shown and described here.

[0026] As shown in Figs. 5 to 7, each of the detection rods 13a is configured to be bendable into a tip portion 13a1 and a base portion 13a2 via a bending mechanism 15 in the middle portion.

[0027] The tip 13a1 of the detection rod 13a is made of a light-emitting body or a chemical light-emitting body having a built-in LED (light-emitting diode), for example. The base 13a2 of the detection rod 13a may also be made of a light-emitting body or a chemical light-emitting body.

[0028] The bending mechanism 15 is constructed, for example, using a double-sided spring hinge, and when nothing is in contact with the tip 13a1 of the detection rod 13a, the tip 13a1 and the base 13a2 are held in a straight line by the force of the spring. When something comes into contact with the tip 13a, the tip 13a1 is rotated and bent within a range of approximately 180 degrees left and right around the axis of the bending mechanism 15, as shown by the arrow AR in Figure 7, depending on the pressure of the contact.

[0029] Base 13a2 of detection rod 13a is attached to an upper corner of bucket 11 via folding mechanism 15B. Folding mechanism 15B is configured using, for example, a one-way spring hinge, and, for example, in response to the force applied by workers W1, W2 to fold base 13a2 along the edge of bucket 11, base 13a2 is rotated and folded together with detection rod 13a within a range of approximately 90 degrees in the direction along the edge of bucket 11 around the axis of folding mechanism 15B as shown by arrow ARb in Fig. 7.

[0030] In addition, the spring force resisting bending of the bending mechanism 15B is clearly stronger than the spring force resisting folding of the folding mechanism 15B, and the force bending the tip portion 13a1 does not cause the base portion 13a2 to fold.

[0031] In addition, the bending mechanism 15 may be provided with a bending lock mechanism (not shown) that maintains the bent position against a spring force tending to return the bent tip 13a1 to a position along the base 13a2, for example as shown in FIG. 5(C).

[0032] In addition, the folding mechanism 15B may also be provided with a folding lock mechanism (not shown) that maintains the folded position against the spring force tending to return the base 13a2 to its original position when the base 13a2 is folded to a position along the edge of the bucket 11.

[0033] 1 and 4, light projectors 16a-16d using, for example, spot light sources are provided at the four corners of the bottom of bucket 11. Light projectors 16a-16d are provided so that the light projection direction is in the direction in which the vertical edges of the four corners of bucket 11 extend downward. Projected light L from light projectors 16a-16d is projected onto road R to form light points Pa-Pd, thereby indicating the current horizontal position of bucket 11 relative to road R.

[0034] FIG. 8 is a diagram showing a configuration example of a detection rod bending detector 15D built into bending mechanism 15 of detection rods 13a to 13d and 14a to 14h.

[0035] The detection rod bending detection unit 15D includes a magnetic gear 15g that rotates concentrically with the shaft 15j of the bending mechanism 15, which is, for example, a double-opening spring hinge, and a proximity sensor 15s that is disposed opposite the outer periphery of the gear 15g and converts the change in magnetic flux that occurs as the gear 15g rotates and its peak portion passes through into a pulse signal.

[0036] The pulse signal acquired by the proximity sensor 15s of the detection rod bending detection unit 15D is output to a pulse counter Dp, and the number of pulses and the pulse interval of the pulse signal are measured by the pulse counter Dp to acquire the rotation angle and rotation speed of the gear 15g, i.e., the bending angle and bending speed of the detection rods 13a to 13d and 14a to 14h by the bending mechanism 15.

[0037] The pulse counter Dp is built into a control unit 21 (see FIG. 9) which is provided together with the operation unit 12 of the bucket 11 and will be described later, for example.

[0038] FIG. 9 is a block diagram showing the configuration of a bucket / boom control device 20 centered around a control unit 21 provided together with the operation unit 12 of the bucket 11.

[0039] The bucket / boom control device 20 includes a control unit 21 .

[0040] The control unit 21 includes, for example, a processor (CPU: central processing unit) (not shown), a memory 21M, and a pulse counter Dp, and the processor controls the operation of each part of the bucket / boom control device 20 in accordance with a bucket / boom control program stored in the memory 21M.

[0041] The control unit 21 inputs a bucket / boom operation signal for moving the bucket 11 to an arbitrary position, which is output from a bucket / boom operation unit 12A provided on, for example, an operation console of the operation unit 12, and a detection rod ON / OFF signal for turning on / off the light emission of the detection rods 13a to 13d (14a to 14h) and the projection of the projection light L by the light projectors 16a to 16d, which is output from the detection rod ON / OFF switch 12B.

[0042] Furthermore, the control unit 21 inputs a pulse signal output from the proximity sensor 15s (see FIG. 8) of the detection rod bending detection unit 15D, and obtains the bending angle and bending speed of the detection rods 13a to 13d (14a to 14h).

[0043] The control unit 21 controls the movement of the boom 10B via a bucket / boom drive unit 22, which is composed of, for example, an electric motor or a rotation mechanism that utilizes the rotation of the engine of the aerial work vehicle 10, and moves the bucket 11 to any position of a worker W2 operating, for example, the operating unit 12.

[0044] Furthermore, the control unit 21 controls the light emission (ON / OFF) of the detection rods 13a to 13d and 14a to 14h via the light emission driving unit 23.

[0045] Furthermore, the control unit 21 controls the projection (ON / OFF) of the projection light L by the light projection units 16a to 16d via the light projection drive unit 24.

[0046] Next, the operation of the safety device-equipped aerial work platform vehicle 10 according to the embodiment will be described.

[0047] FIG. 10 is a flowchart showing a bucket / boom control process executed by the bucket / boom control device 20 of the vehicle for working at a height with a safety device 10. As shown in FIG.

[0048] FIG. 11 is a plan view that shows a state in which the detection rods 14a, 14h come into contact with the side wall TS of the tunnel and are bent as the bucket 11 of the vehicle for working at height 10 moves.

[0049] FIG. 12 is a side view that shows a state in which projected light L from light projectors 16a to 16d forms light points Pa to Pd on road R within a tunnel as bucket 11 of vehicle for working at height 10 moves.

[0050] As shown in FIG. 1, when workers W1, W2 standing on bucket 11 of aerial work vehicle 10 operate detection rod ON / OFF switch 12B of operating unit 12 to turn the power ON, control unit 21 begins to operate in accordance with the bucket / boom control program (21M) of bucket / boom control device 20, causing detection rods 13a-13d and 14a-14h to emit light (ON) via light emission drive unit 23, and also causing projection light L to be projected (ON) from light projection units 16a-16d via light projection drive unit 24.

[0051] When the bucket / boom operating unit 12A of the operating unit 12 is operated by the workers W1, W2 (step S1 (Yes)), the control unit 21 determines whether or not a bend has been detected in any of the horizontal detection rods 14a-14h and whether or not a bend has been detected in any of the vertical (upward) detection rods 13a-13d based on the pulse signals input to the pulse counter Dp from the detection rod bend detection units 15D of each of the detection rods 13a-13d and 14a-14h (steps S2, S3).

[0052] If it is determined that no bending is detected in any of the detection rods 13a to 13d and 14a to 14h (step S2 (No) → S3 (No)), the control unit 21 controls the movement of the bucket 11 and the boom 10B via the bucket / boom driving unit 22 in response to the bucket / boom operation signal from the bucket / boom operation unit 12A, and moves the bucket 11 to a position of any of the worker W2 (step S4).

[0053] After that, as shown in FIG. 11, for example, when the tip 14a1, 14h1 of one of the horizontal detection rods 14a, 14h comes into contact with the side wall TS in the tunnel, the bending of the detection rod 14a, 14h is detected by the detection rod bending detector 15D built into the bending mechanism 15 of the detection rod 14a, 14h (step S2 (Yes)), or when the tip 13a1, 13d1 of one of the vertical (upward) detection rods 13a, 13d comes into contact with the side wall TS in the tunnel (step S3 (Yes)). When the bending of the detection rods 13a to 13d is detected by the detection rod bending detection unit 15D built into the bending mechanism 15 of the detection rods 13a to 13d as a result of the detection rods coming into contact with the ceiling TC inside the tunnel (step S3 (Yes)), the control unit 21 limits the control of the movement of the bucket 11 and the boom 10B via the bucket / boom driving unit 22 to only the control of moving the bucket 11 downward (lowering) (steps S5, S6).

[0054] As a result, if, during work inside a tunnel using the aerial work vehicle 10, the bucket 11 gets too close to the side wall TS or ceiling TC of the tunnel, which could lead to an accidental contact between the workers W1, W2 and the inner wall of the tunnel or damage to the tunnel or its equipment, the movement of the bucket 11 can be immediately limited to only being lowered.

[0055] Therefore, even in a tunnel with a brightly lit ceiling and a very noisy environment, it is possible to reliably prevent the bucket 11 from approaching abnormally close to the inner wall of the tunnel, which could lead to accidental contact between the workers W1, W2 and damage to the tunnel and its facilities.

[0056] Thereafter, in response to a bucket / boom operation signal from bucket / boom operation unit 12A to lower bucket 11, the position of bucket 11 is moved downward, and contact between any of tips 13a1 to 13d1 (14a1 to 14h1) of detection rods 13a to 13d and 14a to 14h and the tunnel inner wall is released, and a state is restored where bending of detection rods 13a to 13d and 14a to 14h is not detected by detection rod bending detection units 15D built into bending mechanisms 15 of all detection rods 13a to 13d and 14a to 14h (step S7 (Yes)), and control unit 21 releases the restriction on the operation of moving bucket 11 executed in steps S5 and S6 (step S8 → S1).

[0057] In this way, the restriction on the operation of the movement of the bucket 11 is not released until the bending of all of the detection rods 13a to 13d and 14a to 14h is detected, so it is possible to completely prevent a situation in which the bucket 11 is moved upward or left or right in a state where there is even the slightest risk of accidental contact between the workers W1, W2 and the inner wall of the tunnel or damage to the tunnel or its facilities.

[0058] The restriction on the operation of the movement of the bucket 11 is configured to be performed by restricting the control of the bucket 11 only to the downward movement (lowering). However, the present invention is not limited to this. If the bending is detected by the detection rods 13a to 13d that are oriented in the opposite direction to the extension direction of any of the detection rods (13a to 13d and 14a to 14h) that contact the inner wall of the tunnel and are detected to be bent by the detection rod bending detection unit 15D, that is, in the vertical (upward) direction, the downward movement of the bucket 11 is restricted. If the bending is detected by the detection rods 14a and 14h that are oriented in the horizontal direction, the bucket 1 Similarly, if bending is detected by detection rods 14d, 14e, the movement of detection rods 14f, 14g on the opposite side of bucket 11 may be limited to one horizontal direction, and similarly, if bending is detected by detection rods 14d, 14e, the movement of detection rods 14a, 14h on the opposite side of bucket 11 may be limited to one horizontal direction, and similarly, if bending is detected by detection rods 14f, 14g, the movement of detection rods 14a, 14h on the opposite side of bucket 11 may be limited to one horizontal direction, and similarly, if bending is detected by detection rods 14f, 14g, the movement of detection rods 14b, 14c on the opposite side of bucket 11 may be limited to one horizontal direction.

[0059] A supervisor WR standing on road R inside the tunnel and monitoring the work can easily recognize and monitor the position of the bucket 11 and the distance from the bucket 11 in relation to the ceiling TC and side walls TS of the tunnel by visually checking the luminous detection rods 13a-13d and 14a-14h that are attached vertically and horizontally to the upper periphery of the bucket 11.

[0060] Furthermore, by visually checking the light points Pa-Pd formed on the road R by the projected light L from the light projecting units 16a-16d of the bucket 11, the observer WR can easily recognize and monitor the current horizontal position of the bucket 11 relative to the road R. For example, as shown in Fig. 12, the observer WR can easily check, using a white line H drawn on the road R as a reference, whether the bucket 11 is getting too close to the side wall TS of the tunnel or too close to the adjacent lane where vehicles are traveling.

[0061] (Storage function for detection rods 13a-13d (14a-14h)) FIG. 13 is a side view that shows a schematic diagram of a storage procedure using the bending mechanism 15 and the folding mechanism 15B of the detection rods 13a, 13b that are provided at the four corners of the upper part of the bucket 11 and point upward.

[0062] First, as shown by the arrow AR in Fig. 13(A), the tip portions 13a1, 13b1 of the detection rods 13a, 13b (as well as 13c, 13d) are bent and rotated to positions along the base portions 13a2, 13b2, with the bending mechanism 15 as the fulcrum. Next, as shown by the arrow ARb in Fig. 13(B), the base portions 13a2, 13b2 along which the tip portions 13a1, 13b1 are aligned are rotated and folded to positions along the edge of the upper opening of the bucket 11, with the folding mechanism 15B as the fulcrum.

[0063] FIG. 14 is a plan view that shows a schematic diagram of a storage procedure using the bending mechanism 15 and the folding mechanism 15B of the detection rods 14a to 14h that are provided horizontally at the four corners of the upper part of the bucket 11. As shown in FIG.

[0064] As with the detection rods 13a to 13d described above, the detection rods 14a to 14h are first bent and rotated at the tip portions 14a1 to 14h1 to positions along the base portions 14a2 to 14h2, with the bending mechanism 15 as the fulcrum, as shown by the arrow AR in Fig. 14(A). Next, as shown by the arrow ARb in Fig. 14(B), the base portions 14a2 to 14h2 along which the tip portions 14a1 to 14h1 are aligned are rotated and folded at the folding mechanism 15B as the fulcrum to positions along the edge of the upper opening of the bucket 11.

[0065] In this case, it is not necessary for each detection rod 13a to 13d (14a to 14h) to be folded horizontally along the edge of the upper opening of the bucket 11 with the tip portion 13a1 to 13d1 (14a1 to 14h1) and the base portion 13a2 to 13d2 (14a2 to 14h2) completely overlapping, but rather they may be folded in a zigzag pattern.

[0066] As a result, when the bucket 11 is not in use, the detection rods 13a to 13d (14a to 14h) can be easily stored so as not to get in the way.

[0067] (Summary of the embodiment) In the embodiment of the aerial work vehicle 10 with safety device, the bucket 11 can be moved to any position by rotating it up and down, left and right via the boom 10B in response to the operation of the workers W1, W2. At each of the four corners of the upper part of the bucket 11, detection rods 13a to 13d extending upward and detection rods 14a to 14h extending horizontally along the upper edge of the bucket 11 are provided. When any of the tip portions 13a1-13d1, 14a1-14h1 of the detection rods 13a-13d, 14a-14h contact the inner wall of the tunnel, the detection rods 13a-13d, 14a-14h bend around the bending mechanism 15 interposed between the tip portions 13a1-13d1, 14a1-14h1 and the base portions 13a2-13d2, 14a2-14h2 as a fulcrum, and the bending is detected by the detection rod bending detector 15D built into the bending mechanism 15. By detecting the bending of the detection rods 13a-13d, 14a-14h, it is determined that the bucket 11 has approached the ceiling TC or the side wall TS of the tunnel, and the operation for moving the bucket 11 is limited to only the operation of moving the bucket 11 downward or only the operation of moving the bucket 11 in the opposite direction to the direction in which the contact with the inner wall of the tunnel was detected.

[0068] As a result, if, during work inside a tunnel using the aerial work vehicle 10, the bucket 11 gets too close to the side wall TS or ceiling TC of the tunnel, which could lead to an accidental contact between the workers W1, W2 and the tunnel inner wall or damage to the tunnel or its equipment, the bucket 11 can be immediately prohibited from moving any further in the direction approaching the tunnel inner wall, and the bucket 11 can be moved away from the tunnel inner wall.

[0069] According to the safety device-equipped aerial work platform vehicle 10 of the embodiment, the detection rods 13a to 13d and 14a to 14h are configured using, for example, a light-emitting body with a built-in LED or a chemical light-emitting body.

[0070] This allows the observer WR on the road R to easily recognize and observe the position of the bucket 11 and the distance from the bucket 11 relative to the ceiling TC and side walls TS in the tunnel.

[0071] Furthermore, according to the embodiment of the aerial work vehicle 10 with safety device, light projection units 16a to 16d using, for example, spot light sources are provided at the four corners of the lower part of the bucket 11 to project projection light L downward and form light points Pa to Pd on the road R.

[0072] This enables the monitor WR to easily recognize and monitor the current horizontal position of the bucket 11 relative to the road R, and to easily check whether the bucket 11 is getting too close to the side wall TS of the tunnel or too close to the adjacent lane where vehicles are passing.

[0073] Therefore, even in a tunnel with a brightly lit ceiling and a very noisy environment, it is possible to reliably prevent the bucket 11 from approaching abnormally close to the inner wall of the tunnel, which could lead to accidental contact between the workers W1, W2 and damage to the tunnel and its facilities.

[0074] (Other embodiments) FIG. 15 is a perspective view that shows a schematic representation of a storage function of another embodiment of the detection rods 13a to 13d that are provided at the four corners of the upper part of the bucket 11 and point upward.

[0075] The detection rods 13a to 13d described in the above embodiment are configured so that their bases 13a2 to 13d2 are provided at the four corners of the upper part of the bucket 11 via the folding mechanism 15B.

[0076] In contrast to this, as shown in FIG. 15, for example, vertically elongated detection rod storage holes 17a-17d may be provided in the four corners of the upper part of bucket 11, utilizing the thickness of the edge of bucket 11, and detection rods 13a-13d may be stored by sliding them vertically into detection rod storage holes 17a-17d, as shown by arrows x.

[0077] In this case, the bases 13a2 to 13d2 of the detection rods 13a to 13d are configured to be attached to a rail portion (not shown) formed in the vertical direction on the inner wall of the detection rod storage holes 17a to 17d via a pedestal (not shown) that can engage with the rail portion and slide.

[0078] This not only makes it possible to store the detection rods 13a to 13d in the detection rod storage holes 17a to 17d, but also makes it possible to adjust the range in which the detection rods 13a to 13d detect contact with the inner wall of the tunnel by providing a position holding mechanism (not shown) that, for example, gradually fixes and holds the position at which the bases of the bases 13a2 to 13d2 slide relative to the aforementioned rail portion, and makes it possible to change the length by which the detection rods 13a to 13d extend from the detection rod storage holes 17a to 17d.

[0079] In the above embodiment, the high-altitude working apparatus with safety device has been described as an high-altitude working vehicle 10 with a safety device, as shown in Figure 1. However, the boom 10B and bucket 11 of the embodiment are not limited to those provided on a vehicle driven by a human, but may be provided, for example, on a wheeled cart that can be moved on the ground by human operation, and the wheeled cart on which the boom 10B and bucket 11 are provided may be referred to as the high-altitude working apparatus with a safety device.

[0080] Although some 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 implemented 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 in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0081] 10...aerial work platform with safety device, 10B...boom, 11...bucket, 12...operation unit, 12A...bucket / boom operation unit, 12B...detection rod ON / OFF switch, 13a to 13d...upward detection rod, 14a to 14h...horizontal detection rod, 13a1 to 13d1, 14a1 to 14h1...detection rod tip, 13a2 to 13d2, 14a2 to 14h2...detection rod base, 15...bending mechanism, 15B...folding mechanism, 15D...detection rod bending detection unit, 16a to 16d...light projection unit, 17a to 17d...detection rod storage hole, 20...bucket / boom control device, 21...control unit, 22...bucket / boom drive unit, 23...light emission drive unit, 24...light projection drive unit, R...road, TC...tunnel ceiling, TS...tunnel side wall, L...projected light, Pa to Pd...light spot.

Claims

1. A bucket for a worker to ride on and perform work on a work object; A bucket control means for moving the bucket to an arbitrary position; an upward detection rod that is a rod-shaped body provided on an upper edge of the bucket facing upward and detects contact with an obstacle by bending the rod-shaped body; a horizontal detection rod that is a rod-shaped body that is provided on an upper edge of the bucket in a horizontal direction toward the outside of the bucket and detects contact with an obstacle by bending the rod-shaped body; a movement limiting means for limiting a direction in which the bucket is moved by the bucket control means to a direction opposite to a direction in which the contact with the obstacle is detected, when the contact with the obstacle is detected by the upward detection rod or the horizontal detection rod; Aerial work equipment equipped with a safety device.

2. A bucket for a worker to ride on and perform work on a work object; A bucket control means for moving the bucket to an arbitrary position; an upward detection rod that is a rod-shaped body provided on an upper edge of the bucket facing upward and detects contact with an obstacle by bending the rod-shaped body; a horizontal detection rod that is a rod-shaped body that is provided on an upper edge of the bucket in a horizontal direction toward the outside of the bucket and detects contact with an obstacle by bending the rod-shaped body; a movement limiting means for limiting a direction in which the bucket is moved by the bucket control means to a downward direction when contact with the obstacle is detected by the upward detection rod or the horizontal detection rod; Aerial work equipment equipped with a safety device.

3. The upward detection rod and the horizontal detection rod have a bending mechanism interposed in the middle of the rod-shaped body to bend the tip end of the rod-shaped body relative to the base of the rod-shaped body, and the bending mechanism has a detection rod bending detection unit that detects bending of the rod-shaped body by bending of the bending mechanism.

3. The high altitude working apparatus with a safety device according to claim 1 or 2.

4. the bending mechanism for the upward detection rod and the horizontal detection rod has a spring force that holds the rod-shaped body in a straight line when the tip of the rod-shaped body is not in contact with anything, The device further includes a restriction release means for releasing the restriction on the direction in which the bucket is moved when the bending of the rod-shaped body is no longer detected by the detection rod bending detection unit after the direction in which the bucket is moved is restricted by the movement restriction means.

4. The high altitude working apparatus with a safety device according to claim 3.

5. At least the tip of the upward detection rod and the horizontal detection rod is made of a light-emitting body.

5. The high altitude working apparatus with a safety device according to claim 1.

6. A light projection unit is provided on the edge of the lower part of the bucket and projects spot-shaped light downward of the bucket.

6. A high altitude working apparatus with a safety device according to any one of claims 1 to 5.

7. The bucket is box-shaped, The upward detection rod and the horizontal detection rod are provided at the four corners of the upper part of the bucket.

7. The high altitude working apparatus with a safety device according to claim 1.

8. A bucket for a worker to ride on and perform work on a work object; A bucket control means for moving the bucket to an arbitrary position; an upward detection rod that is a rod-shaped body provided on an upper edge of the bucket facing upward and detects contact with an obstacle by bending the rod-shaped body; a horizontal detection rod that is a rod-shaped body that is provided on an upper edge of the bucket in a horizontal direction toward the outside of the bucket and detects contact with an obstacle by bending the rod-shaped body; With the high altitude work equipment, when contact with the obstacle is detected by the upward detection rod or the horizontal detection rod, the direction in which the bucket is moved by the bucket control means is limited to a direction opposite to the direction in which the contact with the obstacle was detected. This is a method of working at height.

9. A bucket for a worker to ride on and perform work on a work object; A bucket control means for moving the bucket to an arbitrary position; an upward detection rod that is a rod-shaped body provided on an upper edge of the bucket facing upward and detects contact with an obstacle by bending the rod-shaped body; a horizontal detection rod that is a rod-shaped body that is provided on an upper edge of the bucket in a horizontal direction toward the outside of the bucket and detects contact with an obstacle by bending the rod-shaped body; With the high altitude work equipment, When the upward detection rod or the horizontal detection rod detects contact with the obstacle, the bucket control means limits the direction in which the bucket is moved to a downward direction. This is a method of working at height.

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