JP7817079B2 - Assist device for high-altitude electrical work - Google Patents

Description

The present invention relates to an assist device for high-altitude electrical work.

For high-altitude electrical work, workers rode in a work bucket attached to the tip of the boom of an aerial work vehicle to carry out electrical work on overhead power lines.
At this time, the worker in the work bucket holds an insulated operating stick (see Patent Documents 1 and 2) with both hands to perform the work operation.

Recently, the tools attached to the tip of the insulating stick have become more complicated and heavier.
Therefore, a technique has been proposed in which the base of the insulating stick is installed in the work bucket of an aerial work vehicle (see Patent Documents 3 and 4).

Japanese Utility Model Application Laid-Open Publication No. 3-3110 Japanese Patent Application Laid-Open No. 2019-161778 JP 2017-103863 A Japanese Patent Application Laid-Open No. 2000-324637

However, the invention described in Patent Document 3 has a configuration in which the operating stick is installed in a vertical position on the inner bottom wall of the work bucket. This means that the work bucket needs to be moved to a position directly below the overhead power lines, which has the disadvantage of making it difficult to perform complex and delicate electrical work. It also has the disadvantage that the worker must work while looking directly upward, which puts strain on the body.

In addition, in the invention described in Patent Document 4, the operating stick can be firmly and stably supported by a holding (fixing) device fixed to the work bucket, thereby reducing the physical burden on the worker. However, the relative positional relationship between the overhead power line and the work bucket in the up-down, front-back, and left-right directions is fixed and cannot be easily changed, which has the disadvantage that various electrical work on the overhead power line cannot be carried out smoothly and work efficiency is significantly reduced.
Especially in urban areas, overhead power lines are often congested, making it difficult for the work bucket of an aerial work vehicle to easily approach the power lines being worked on. In such cases, workers must attach heavy rotary tools or horizontal pipe members to the tip of the control stick and support the base end while working. This forces the worker to operate the control stick from a somewhat distant position in an awkward posture, placing a heavy burden on the worker in handling the control stick, whose center of gravity is biased toward the tip.

The present invention aims to provide an assist device that overcomes these conventional drawbacks, significantly reduces the physical strain (reducing fatigue) on workers riding in the work bucket of an aerial work vehicle, and enables electrical work to be performed efficiently, accurately, and with high quality.

Another objective is to provide an assist device that allows workers to smoothly adjust and perform accurate, high-quality work even when the relative positional relationship between the work bucket and the part of the (congested) overhead power line being worked on changes left and right, up and down, or front and back. In particular, the objective is to provide an assist device that can smoothly adjust even when the "height" from the work bucket to the part of the (overhead power line) being worked on changes significantly.

The present invention therefore comprises a mounting fixture attached to the upper peripheral edge of an upwardly opening, box-shaped work bucket provided at the tip of the boom of an aerial work vehicle; a base member attached to the mounting fixture so as to be rotatable about a vertical axis; a strip-shaped first arm plate pivotally attached to the base member so as to be able to swing up and down about a horizontal axis; a strip-shaped second arm plate overlapping the first arm plate so as to be able to extend from the tip of the first arm plate; a guide rail mechanism that linearly reciprocates the first arm plate and second arm plate while maintaining them in a linear state; and a roughly Y-shaped stick receiver attached to the tip of the second arm plate and capable of receiving an insulated operating stick.

A gas spring is also provided to constantly urge the band-shaped first arm plate upward around the horizontal axis.

A stopper piece is attached to the front lower edge of the band-shaped first arm plate, with its attachment position adjustable in the longitudinal direction; and a stopper rod set to a fixed length is attached between the front lower edge and the base member; when the first arm plate swings downward against the elastic force of the gas spring, the stopper piece prevents movement of the upper end of the stopper piece, thereby restricting the inclination angle of the first arm plate to a predetermined value.

The stick receiver also includes a substantially Y-shaped fixed receiver body attached to the tip of the second arm plate, and the fixed receiver body has two upwardly protruding arms with left-right through-holes; the protruding shafts of a swingable receiver plate, which has left-right protruding shafts and a recessed receiving portion, are inserted into the through-holes of the fixed receiver body; the swingable receiver plate is pivotally mounted so as to be swingable.

A stopper piece is attached to the front lower edge of the strip-shaped first arm plate, with its attachment position adjustable in the longitudinal direction; a stopper rod with a fixed length is attached between the front lower edge and the base member; when the first arm plate swings downward against the elastic force of the gas spring, the stopper piece prevents movement of the upper end of the stopper rod; and the inclination angle of the first arm plate is restricted to a predetermined value.

According to the present invention, by holding the middle portion of the operating stick on the stick receiver, the tip of the stick receiver can be moved freely in all directions, left and right, up and down, and forward and backward, as desired by the worker, particularly over a vast space, from the work bucket to a high (distant) work location. From the work bucket stationary in a fixed spatial position, stripping (striping), cutting, taping, and other work (taping) of overhead electric wires can be performed easily, smoothly, and quickly with less fatigue. In particular, even when heavy rotary tools or horizontal pipe members are attached to the tip of the operating stick, the middle position of the operating stick is reliably supported, reducing the physical burden on the worker and allowing electrical work to be performed smoothly and efficiently over a vast space, from work locations close to the work bucket to high and distant work locations.

FIG. 1 is an overall perspective view showing an example of a state of use. FIG. 1 is an overall side view showing an example of a state of use. 1A and 1B are diagrams showing a state in which an operator is using an operating stick to perform work at a work location that is at a relatively low height when viewed from the work bucket, where (A) is a side view showing the case in which the work location is close to the bucket, and (B) is a side view showing the case in which the work location is far away. 1A and 1B are diagrams showing a state in which an operator is using an operating stick to perform work at a work location that is at a medium height when viewed from the work bucket, where (A) is a side view showing the case in which the work location is close to the bucket, and (B) is a side view showing the case in which the work location is high and far away. 1A and 1B are diagrams showing a state in which an operator is using an operating stick to perform work at a work location that is located at a high position when viewed from the work bucket, where (A) is a side view showing the case in which the work location is somewhat close to the bucket, and (B) is a side view showing the case in which the work location is even higher. 10 is a side view illustrating the range of the trajectory and the movable area that the tip of the insulating operation stick supported by the assist device according to the present invention follows during operation. FIG. FIG. FIG. FIG. FIG. 10 is a front view illustrating the movable range within which the insulating operation stick can move during operation. FIG. 10 is a side view showing a state in which the second arm plate is contracted relative to the first arm plate. FIG. 10 is a side view showing a state in which the second arm plate is extended relative to the first arm plate. FIG. 10 is a detailed side view of the first arm plate and the gas spring. FIG. 2 is a front view showing the first arm plate, the guide rail mechanism, the second arm plate, and the gas spring. FIG. 2 is a cross-sectional view showing the internal mechanism of the gas spring and its surroundings. FIG. FIG. 10 is a side view illustrating the operation of the stick receiver. 10 is a side view for explaining the operation of the insulating operation stick held by the stick receiver. FIG.

The present invention will be described in detail below based on the illustrated embodiments.
1 and 2, reference numeral 10 denotes an aerial work vehicle, and an upwardly opening box-shaped work bucket 1 is attached to the tip of its telescopic boom 11. The telescopic boom 11 rotates and extends to move the work bucket 1 toward the electric wires (overhead electric wires) 3 suspended above the electric poles 2, 2, as shown in Figures 1 and 2. In principle, the work bucket 1 is stopped just before and slightly below the electric wires 3.

The assist device 30 according to the present invention is attached to a portion of the upper peripheral edge 12 of the work bucket 1. The worker M climbs into the work bucket 1 and performs various electrical work (tasks) from within the bucket 1, with the operating stick 5 supported by the assist device 30 according to the present invention.

As shown in Figures 2 to 12, the assist device 30 of the present invention has a mounting fixture 4 that is attached to the upper peripheral edge 12 of the work bucket 1. In the illustrated example, the cross-sectional shape is an angular "H" shape (see Figures 11 and 12). In other words, it consists of a (downwardly opening) U-shaped portion (channel portion) 4C that is fitted from above onto the upper peripheral edge 12 of the work bucket 1, and an upper protrusion 4H that protrudes upward from the corner of the U-shaped portion 4C. Note that (although not shown), it is desirable to drill a screw hole in part of the downwardly opening U-shaped portion 4C and thread a bolt into the screw hole to firmly attach and secure it to the upper peripheral edge 12.

11 and 12, reference numeral 15 denotes a base member which is attached to the fixture 4 so as to be rotatable about a vertical axis Lh.
Specifically, a vertical support shaft 16 is erected integrally with the mounting fixture 4. The base member 15 is made up of a cylindrical portion 15P rotatably fitted around the axis Lh of this vertical support shaft 16, a block-shaped base main body 15A fixed to the lower end of the cylindrical portion 15P, and an upper arm portion 15B fixed to the upper end of the cylindrical portion 15P.
11 and 12, the lower end of the vertical support shaft 16 is inserted into and fixed to a hole in a holed block 17 fixed to the mounting fixture 4.

As described above, the band-shaped first arm plate 21 is pivotally attached to the upper arm portion 15B (projecting horizontally) of the attached base member 15 so as to be rotatable about the vertical axis Lh relative to the mounting fixture ₄ and so as to be able to swing up and down about the horizontal axis L6 (as indicated by arrows _M1 and _M2 in Figure 11).
Furthermore, reference numeral 22 denotes a strip-shaped second arm plate, which is slidably attached to the first arm plate 21 and is overlapped with the tip 21A of the first arm plate 21 so as to be extendable therefrom.

A guide rail mechanism G that moves the first arm plate 21 and the second arm plate 22 back and forth linearly while maintaining them in a straight line is provided between the first arm plate 21 and the second arm plate 22, as shown in Figure 14.
The guide rail mechanism G preferably has a structure similar to that of a guide rail (consisting of an outer cylinder and an inner cylinder) used in furniture such as cabinets.
A substantially Y-shaped stick receiver 6 capable of receiving an insulating operation stick 5 is attached (fixed) to the tip of the second arm plate 22 (see FIGS. 18 and 12).

Next, as shown in Figures 13, 14 and 15, a gas spring 18 is attached to constantly urge the band-shaped first arm plate 21 to rotate upward around the horizontal axis _L6 as shown by arrow _M21 .
Specifically, a cam 27 is fixed to a horizontal fixed shaft 26 (see FIG. 12) fixed to the upper arm portion 15B of the base member 15.
An enclosing casing 28 is fixed to the side surface of the base end of the first arm plate 21, and the fixed shaft 26 passes through this casing 28, and the cam 27 fixed to the fixed shaft 26 is also contained within the casing 28.

Furthermore, the gas spring (gas damper) 18 is fixed to the upper wall of the casing 28 in an upwardly protruding manner. A small roller 31 that rolls against the cam 27 and presses against it is pivotally mounted on a swinging member 29 that swings about an axis L ₂₉ by a rod 18A of the gas spring 18.
Therefore, when the small roller 31 rolls while pressing against the cam 27, the first arm plate 21 receives a rotational torque (rotational moment) for upward swinging as indicated by the arrow _M21 due to the reaction force that the small roller 31 receives from the cam 27. The direction of the arrow M1 (of the arrows _M1 and _M2 ) explained in FIG. ₁₁ corresponds to the direction of the rotational torque (rotational moment) _M21 generated by the gas spring 18 and the cam 27.

In this way, the first arm plate 21 is constantly subjected to a rotational torque _M21 in the upward swing direction, and therefore the second arm plate 22 attached to this first arm plate 21 and the stick receiver 6 at its tip are also constantly resiliently biased in the upward swing direction, and therefore the middle portion of the operating stick 5 held by the stick receiver 6 is constantly supported while being resiliently biased upward.
In short, the elastic force of the gas spring 18 constantly urges the strip-shaped first arm plate 21 upward in an elastic rotational force _M21 around the horizontal axis _L6 .

11 and 12, reference numeral 20 denotes a stopper rod set to a fixed length. A stopper piece 25 is attached to the front lower edge 23 of the first arm plate 21 so that the fixing position can be freely changed and adjusted in the longitudinal direction.
The stopper rod 20 is interposed between the front lower edge 23 and the base body 15A of the base member 15. When the first arm plate 21 swings downward against the resilient force of the gas spring 18 (see Figure 15), the stopper piece 25 prevents the movement of the upper end portion of the stopper rod 20, thereby restricting the inclination angle of the first arm plate 21 (and the second arm plate 22) to a predetermined value.
In addition, the stopper piece 25 can be attached to the upper end of the stopper rod 20 either connected to or integral with the upper end of the stopper rod 20, or attached independently along the front lower edge 23 so that its fixing position can be changed and adjusted.

As shown in FIGS. 16 to 18, the stick receiver 6 for receiving the operating stick 5 includes a substantially Y-shaped fixed receiver body 33 attached (fixed) to the tip of the second arm plate 22.
Furthermore, the fixing receiver body 33 has two upwardly projecting arms 34, 34, and the upwardly projecting arms 34, 34 have through holes 35, 35 in the left-right direction (coaxially aligned).

Reference numeral 36 denotes a U-shaped swinging receiving plate (enlarged upward) having left and right protruding shafts 37, 37 which are inserted into through holes 35, 35 of the receiving device main body 33. As indicated by arrow _M36 , the receiving plate 36 can swing left and right relative to the receiving device main body 33. With this configuration, as shown in Figure 18, it is easy to swing the operating stick 5 in the direction of arrow _M5 , and in the usage state shown in Figures 1 and 2, the tip of the operating stick 5 can be moved to a desired position relative to the electric wire 3, etc.

As shown in Figures 16 and 17, it is desirable to form a sufficient gap between the lower half (outer surface) of the swinging receiving plate 36 and the (upward-opening) approximately U-shaped recess 33A of the receiving body 33 to allow sufficient swinging in the direction of arrow _M36 .

As shown in Figures 1 and 2, the assist device of the present invention allows a worker M riding in the work bucket 1 to safely and efficiently perform various electrical work on high-altitude electric wires 3. Figures 3, 4, and 5 show that the tilt angle of the control stick 5 (as viewed from the side) can be adjusted from nearly horizontal to nearly vertical. Moreover, while it is of course easy to accommodate electric wires 3 close to the work bucket 1 (see Figures 1 and 2), the extension of the first arm plate 21 and second arm plate 22, which exert a strong supporting force, allows for safe and efficient high-altitude work while reducing the physical fatigue of the worker M, even for electric wires 3 far from the bucket 1 (see Figures 1 and 2), as shown in Figures 3(B) and 4(B), and electric wires 3 located sufficiently high above the bucket 1 (see Figures 1 and 2), as shown in Figures 4(B) and 5(B).

Comparing Figures 3(A), 4(A), and 5(A) with Figures 3(B), 4(B), and 5(B), it is clear that all that is required is to feed the operating stick 5 (forward and upward) relative to the stick receiver 6 while keeping the overall length of the operating stick 5 the same.
Furthermore, the reachable area Z of the tip end 5p of the operating stick 5 shown in Figures 3(A)(B), 4(A)(B), and 5(A)(B) is shown by dots in Figure 6. In other words, it is shown as a band of a predetermined width Wz and a curved arc. In this way, it is clear that when viewed from the side, it is possible to cover areas far from the bucket 1, from low to high places.

As already mentioned in Figures 11 and 12, the cylindrical portion 15P of the base member 15 is rotatably fitted onto the vertical support shaft 16. Therefore, the first arm plate 21, second arm plate 22, stopper rod 20, etc. attached to the base member 15, as well as the stick receiver 6 and the operating stick 5 held thereby, can swing (swing) left and right around the vertical support shaft 16 in a plan view, as shown in Figures 7, 8, and 9.

In this way, by referring to the plan views of Figures 7, 8, and 9 and the front view shown in Figure 10, the worker M can swing (swing) the operating stick 5 over a wide range in the left-right direction and a wide range in the up-down direction, and can ride on the work bucket 1 as shown in Figures 1 and 2 to perform electrical work on the overhead power lines 3 efficiently and safely.
7 to 10 show an example in which the overall length of the operation stick 5 is kept constant, but as already explained in Fig. 6, the operation stick 5 can be moved in its longitudinal direction to freely change the tip 5P within the area Z indicated by dots, and therefore, by combining Figs. 7 to 10 with Fig. 6, it can be seen that electrical work (tasks) can be performed over a vast area Z. In other words, the relative positional relationship between the overhead power line 3 and the work bucket 1 in the up-down, front-back, and left-right directions can be easily changed, and the tip 5P of the operation stick 5 -- and the rotary tools and horizontal pipe members (for electrical work) attached thereto -- can be easily and safely changed within the vast area Z, which significantly improves the efficiency of electrical work and greatly reduces the physical burden on the worker M.

In addition, for the purposes of this invention, "electrical work" is defined to include "communication line work."

[0014] As described above in detail, the present invention comprises: a mounting fixture 4 attached to the upper peripheral edge portion 12 of the upwardly opening box-shaped work bucket 1 provided at the tip of the boom 11 of an aerial work vehicle 10; a base member 15 attached to the mounting fixture 4 so as to be rotatable about a vertical axis Lh; a strip-shaped first arm plate 21 pivotally attached to the base member ₁₅ so as to be able to swing up and down about a horizontal axis L6; a strip-shaped second arm plate 22 extended from the tip 21A of the first arm plate 21 and overlapped with the first arm plate 21; a guide rail mechanism G which linearly reciprocates the first arm plate 21 and the second arm plate 22 while maintaining them in a linear state; and a substantially Y-shaped stick receiver 6 attached to the tip of the second arm plate 22 and capable of receiving an insulated operating stick 5, and therefore can exhibit the following effects.

That is, (i) Because the guide rail mechanism G is interposed between the band-shaped first arm plate 21 and the band-shaped second arm plate 22, the cross section of the guide rail mechanism G can be designed with a large vertical width and a small thickness. (ii) The guide rail mechanism G can be designed with a large vertical width and a small thickness, which is advantageous for withstanding vertical bending forces acting on the guide rail mechanism G. (iii) The overall weight can be reduced, and even when vertical bending forces act, the second arm plate 22 can smoothly extend and retract relative to the first arm plate 21. (iv) By rotating the base member 15 around the vertical axis Lh, the operating stick 5 can be swung widely left and right, as shown in Figures 7 to 9 and 10, to cover a wide area. In other words, the operating stick 5 can be swung widely left and right from the work bucket 1 illustrated in Figure 1, allowing for quick and easy access to the required work location on the overhead power line 3. (v) By pushing or retracting the operating stick 5 axially relative to the approximately Y-shaped stick receiver 6, the reachable area Z of the tip 5P can be expanded, as shown in Figure 6. (vi) The physical burden on the worker M can be significantly reduced. (vii) In urban areas, overhead power lines are often congested, making it difficult for the work bucket of an aerial work vehicle to easily approach the power lines being worked on. In such cases, the worker must attach a heavy rotary tool or horizontal pipe member to the tip of the operating stick and support the base end while working. This forces the worker to operate the operating stick from a somewhat distant position in an awkward position, placing a heavy burden on the worker when handling an operating stick with its center of gravity biased toward the tip. The assist device of the present invention has the effect of particularly solving these problems.

Furthermore, the gas spring 18 is attached to the band-shaped first arm plate 21, which constantly applies a resilient rotational force _M21 upward around the horizontal axis _L6 . This constantly resiliently supports the middle portion of the control stick 5, making it possible to move the tip 5P of the control stick left and right, up and down, and forward and backward, allowing various tasks to be performed efficiently and without fatigue. In particular, even when a heavy rotary tool or horizontal pipe member weighing 5 to 12 kg is attached to the tip 5P of the control stick 5, the resilient support provided by the gas spring 18 is sufficient to significantly reduce the physical burden on the worker. Moreover, the rotary tool or horizontal pipe member attached to the tip 5P of the control stick can be moved up and down, left and right, and forward and backward, making it possible to perform the entire task easily and smoothly (with reduced physical burden).

Furthermore, a stopper piece 25 is attached to the front lower edge 23 of the strip-shaped first arm plate 21 so that its fixing position can be changed and adjusted in the longitudinal direction; and a stopper rod 20 set to a fixed length is attached between the front lower edge 23 and the base member 15; when the first arm plate 21 swings downward against the elastic force of the gas spring 18, the stopper piece 25 prevents movement of the upper end of the stopper rod 20 and restricts the inclination angle of the first arm plate 21 to a predetermined value.Therefore, if the load acting on the stick receiver 6 is equal to or greater than a predetermined value, the first arm plate 21, second arm plate 22, etc. swing downward and are restricted to a predetermined position, allowing electrical work to be performed safely. If the load is less than a predetermined value, the operating stick 5 attached to (held by) the stick receiver 6 is supported while gently swinging elastically due to the resilient force of the gas spring 18 (in the direction of _M1 in Figure 11), allowing the worker M to perform electrical work easily. By adjusting the fixed position of the stopper piece 25, the operating stick 5 can be set to the most convenient position depending on the situation at the electrical work site.

The stick receiver 6 is provided with a substantially Y-shaped fixed receiver body 33 attached to the tip of the second arm plate 22, and the fixed receiver body 33 has two upwardly protruding arms 34, 34, and the upwardly protruding arms 34, 34 have through holes 35, 35 in the left and right direction; and a swinging receiver plate 36 having left and right protruding shafts 37, 37 and a concave receiving portion has its protruding shafts 37, 37 inserted into the through holes 35, 35 of the fixed receiver body 33; and the swinging receiver plate 36 is pivotally mounted so as to be swingable. Therefore, when an operator grasps the base position of the operation stick 5 with his hand and drops (fits) the middle portion of the operation stick 5 into (fits) the concave receiving portion of the swinging receiver plate 36 of the stick receiver 6, and then attempts to swing the operation stick 5 up and down as shown by arrow _M5 , as shown in FIG. 18, the swinging receiver plate 36 will smoothly swing (as shown by arrow M5) around the through holes 35 (left and right protruding shafts 37). ₃₆ ), it is possible to easily change (adjust) the tilt position of the operation stick 5, and the work efficiency of electrical work can also be improved.

Furthermore, a stopper piece 25 is attached to the front lower edge 23 of the strip-shaped first arm plate 21 so that its fixing position can be changed and adjusted in the longitudinal direction; and a stopper rod 20 set to a fixed length is attached between the front lower edge 23 and the base member 15; when the first arm plate 21 swings downward against the elastic force of the gas spring 18, the stopper piece 25 prevents movement of the upper end of the stopper rod 20; and since the inclination angle of the first arm plate 21 is configured to be restricted to a predetermined value, if the load acting on the stick receiver 6 is equal to or greater than a predetermined value, the first arm plate 21, second arm plate 22, etc. swing downward and are restricted to a predetermined posture, allowing electrical work to be performed safely. If the load is less than a predetermined value, the operating stick 5 attached (held) in the stick receiver 6 is supported while gently swinging elastically due to the elastic force of the gas spring 18 (in the direction _M1 in FIG. 11), allowing the worker M to perform electrical work easily. By adjusting the fixed position of the stopper piece 25, the operating stick 5 can be set to the most convenient position depending on the situation at the electrical work site. Furthermore, as shown in FIG. 18, if the operating stick 5 is to be swung up and down as indicated by arrow _M5 , the swing support plate 36 smoothly swings (see arrow _M36 ) around the through-hole 35 (left and right protruding shaft 37), allowing the tilted position of the operating stick 5 to be easily changed (adjusted), further improving the efficiency of electrical work.

1 Work bucket 5 Operation stick 6 Stick receiver
10. Aerial work platform
11. Boom
15 Base material
18 Gas spring
20 Stopper rod
21 First arm plate
21A Tip
22 Second arm plate
23 Lower front edge
25 Stopper piece
33 Receptacle body
34 Upward protruding arm
35 Through hole
36 Swinging support plate
37 Left and right protruding axis G Guide rail mechanism L ₆ Horizontal axis Lh Vertical axis M ₂₁ Arrow (spring rotation energized)

Claims (5)

a mounting fixture (4) attached to an upper peripheral edge (12) of an upwardly opening box-shaped work bucket (1) provided at the tip of a boom (11) of an aerial work vehicle (10);
a base member (15) attached to the mounting fixture (4) so as to be rotatable about a vertical axis (Lh);
a strip-shaped first arm plate (21) pivotally attached to the base member (15) around a horizontal axis (L ₆ ) so as to be able to swing up and down;
a strip-shaped second arm plate (22) overlapping the first arm plate (21) so as to be freely extendable from a tip (21A) of the first arm plate (21);
a guide rail mechanism (G) that linearly reciprocates the first arm plate (21) and the second arm plate (22) while maintaining them in a linear state;
a substantially Y-shaped stick receiver (6) attached to the tip of the second arm plate (22) and capable of receiving an insulating operation stick (5);
An assist device for high-altitude electrical work characterized by comprising: 2. An assisting device for electrical work at heights according to claim 1, further comprising a gas spring (18) for constantly biasing the band-shaped first arm plate (21) in an upwardly resilient rotational direction ( _M21 ) around the horizontal axis ( _L6 ). A stopper piece (25) is attached to the front lower end edge (23) of the band-shaped first arm plate (21) so that the fixing position can be changed and adjusted in the longitudinal direction.
Furthermore, a stopper rod (20) having a fixed length is attached between the front lower end edge (23) and the base member (15),
3. An assist device for high-altitude electrical work as described in claim 2, wherein when the first arm plate (21) swings downward against the elastic force of the gas spring (18), the stopper piece (25) prevents movement of the upper end portion of the stopper rod ( 20 ) and restricts the inclination angle of the first arm plate (21) to a predetermined value. The stick receiver (6) has a substantially Y-shaped fixed receiver body (33) attached to the tip of the second arm plate (22), and the fixed receiver body (33) has two upwardly protruding arms (34), (34), and the upwardly protruding arms (34), (34) have through holes (35), (35) in the left-right direction,
Furthermore, the protruding shafts (37) (37) of the swingable receiving plate (36) having left and right protruding shafts (37) (37) and a concave receiving portion are inserted into the through holes (35) (35) of the fixed receiving device main body (33),
2. An assisting device for electrical work at height according to claim 1, wherein the swinging receiving plate (36) is pivotally mounted so as to be swingable. a gas spring (18) is attached to the band-shaped first arm plate (21) to constantly apply a spring force (M21) to rotate the band-shaped first arm plate (21) upward around the horizontal axis ( _L6 ) _;
A stopper piece (25) is attached to the front lower end edge (23) of the band-shaped first arm plate (21) so that the fixing position can be changed and adjusted in the longitudinal direction.
Furthermore, a stopper rod (20) having a fixed length is attached between the front lower end edge (23) and the base member (15),
When the first arm plate (21) swings downward against the resilient force of the gas spring (18), the stopper piece (25) prevents the movement of the upper end portion of the stopper rod (20),
5. An assisting device for electrical work at height according to claim 4, wherein the inclination angle of the first arm plate (21) is restricted to a predetermined value.