JP2022182676A - Assist device for electrical work in high place - Google Patents

Abstract

To provide an assist device capable of relieving a physical load on a worker executing electrical work in a high place.SOLUTION: A fixture 4, which is attached to an upper peripheral edge part 12 of a work bucket 1 of a vehicle for high lift work, is provided, and a link arm mechanism 20 is provided. A support force exerting unit, which horizontally moves a stick retainer 6 for receiving an operation stick 5 rightward, leftward, forward and backward and constantly urges it upward in a resilient and rotative manner, is provided.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to an assist device for electrical work in high places.

For electrical work in high places, a worker rides on a work bucket provided at the tip of a boom of an aerial work vehicle to perform electrical work on overhead wires.
At that time, the worker in the work bucket grips the insulating operation stick (see Patent Documents 1 and 2) with both hands to perform the work operation.

Recently, the work implements attached to the tip of the insulating stick are becoming 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 the aerial work vehicle (see Patent Documents 3 and 4).

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

However, in the invention described in Patent Document 3, the operation stick is installed in a vertical posture on the inner bottom wall surface of the work bucket. Therefore, it is necessary to move the work bucket to a position right below the overhead power line, and it is difficult to perform complicated and delicate electrical work. There was a drawback that was unreasonable.

Further, in the invention described in Patent Document 4, the operation stick can be firmly and stably supported by the holding (fixing) device fixed to the work bucket, so that the burden on the body of the operator is reduced. However, the relative positional relationship between the overhead wire and the work bucket in the vertical, front-back, and horizontal directions is fixed and cannot be easily changed. has the drawback of being significantly reduced.
Especially in urban areas, overhead power lines are often congested, and there are cases where the work bucket of an aerial work vehicle cannot easily approach the power lines to be constructed. In such a case, the operator attaches a heavy rotating tool or a horizontal pipe member to the tip of the operation stick and supports the base end to perform the work. For this reason, the operator has to operate the operation stick in an unreasonable posture from a slightly distant position, and the burden on the operator who has to handle the operation stick whose center of gravity is biased toward the tip side has been increased.

Therefore, the present invention eliminates such conventional drawbacks, significantly reduces the burden on the body of the worker riding on the work bucket of the aerial work vehicle (reduces fatigue), and improves the efficiency of electrical work. , to provide an assisting device that can accurately and with high quality.

Furthermore, even if the relative positional relationship between the work bucket and the (congested) overhead wire to be worked changes in the left, right, up and down, and front and back directions, the worker can respond smoothly and perform accurate and high-quality work. It is another object to provide an assist device capable of performing

Therefore, the present invention provides a fixture attached to the upper peripheral edge of a box-shaped work bucket with an upward opening provided at the tip of a boom of a vehicle for aerial work; a link arm mechanism that is attached so as to be rotatable about an axis, and whose arm tip moves horizontally in a horizontal plane; a substantially Y-shaped stick receiver that receives an insulated operation stick; a stick receiver holding member which is attached to the stick receiver and which is pivotally attached to the tip of the arm so as to be vertically swingable about the horizontal axis; and a first support force exerting unit having a first gas spring that always springs and rotates.

In addition, a locking hole opening downward is formed in the arm distal end portion of the link arm mechanism or in the vicinity thereof; A link arm mechanism folded state holding means including a manual lever for moving the rod vertically and for inserting it into the downwardly opening locking hole from below is attached to the bucket fixture.

Further, the stick receiver holding member has a strip-like shape and is formed with a slide guide groove in the longitudinal direction; and further includes a second gas spring, the upper end of the second gas spring being aligned with the slide guide groove. The lower end of the second gas spring is slidably engaged and pivotally attached to the bucket fixture; and the upper end of the second gas spring is held by the link arm mechanism folded state retaining means under the folded state of the link arm mechanism. The stick receiving member holding member is pressed against the upper end of the slide guide groove to elastically rotate upward about the horizontal axis.

In addition, the shape of the inner surface of the stick receiver that directly receives the operation stick is a basic concave portion sufficiently larger than the cross-sectional shape of the stick, and a circle with a radius equal to the radius of the circular cross-section of the stick. and an arcuate lowermost small recess.

According to the present invention, if the intermediate portion of the operation stick is supported by the stick receiver, the tip of the stick receiver can be freely moved in the left, right, up, down, front, and rear directions as desired by the operator. From a work bucket stationary at a spatial position, stripping (stripping), cutting, taping, and other various works (work) of overhead electric wires can be performed easily, smoothly, and quickly with little fatigue. In particular, even when a heavy rotating tool or horizontal pipe member is attached to the tip of the operation stick, the intermediate position (closer to the proximal end) of the operation stick can be used to generate the elastic support force of the support force exerting unit. , the electrical work can be performed smoothly and efficiently while reducing the physical burden on the worker.

It is an overall perspective view showing an example of the state of use. 1 shows an embodiment of the present invention, in which an operator holds an operation stick by hand, directs the operation stick straight ahead from the work bucket, and swings the operation stick upward to the maximum tilt angle. It is a figure which shows a swing-up posture, (A) is a top view, (B) is a side view. FIG. 10A is a plan view showing a maximum forward lying posture in which an operator holds the operation stick by hand, directs the operation stick straight ahead from the work bucket, and brings the operation stick closer to the horizontal; FIG. , (B) is a side view. FIG. 3 is an enlarged view of a main portion corresponding to the maximum swing posture of FIG. 2, (A) being an enlarged plan view of the main portion, and (B) being an enlarged side view of the main portion; 2 and 3, in which (A) is a plan view and (B) is a side view. FIG. 4 is an enlarged view of essential parts corresponding to the maximum forward lying posture of FIG. 3, where (A) is an enlarged plan view of essential parts and (B) is an enlarged side view of essential parts. It is the side enlarged view which looked at FIG.4(B) from the other side. It is the side enlarged view which looked at FIG.5(B) from the other side. It is the side enlarged view which looked at FIG.6(B) from the other side. 3A is a plan view showing a state in which an operation stick is swung to the right from FIG. 3A, and FIG. 4B is a plan view showing a state in which the operation stick is swung to the left; It is a side view showing a state of swinging to the right in the maximum swing posture. FIG. 10 is a side view showing a state in which the robot is in an intermediate tilted posture and swung to the right; Fig. 10 is a side view showing a state in which the person is in the maximum forward lying posture and swung to the right; FIG. 4 is a partially enlarged cross-sectional side view showing a first support force exerting unit having a first gas spring and a stick receiver holding member; FIG. 4 is a cross-sectional view of a main part of the stick receiver;

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below based on the illustrated embodiments.
In FIG. 1, reference numeral 10 denotes an aerial work vehicle, and a telescopic boom 11 is provided at its tip with a box-shaped work bucket 1 with an upward opening. By rotating and extending the telescopic boom 11, the electric wire (overhead electric wire) 3 suspended above the utility poles 2, 2 is approached as shown in FIG. In principle, the work bucket 1 is approached and stopped in front of and slightly below the electric wire 3 .

An assist device 30 according to the present invention is attached to a portion of the upper peripheral edge portion 12 of the work bucket 1 .
A worker M gets into the work bucket 1, and performs various electrical work (work) from within the bucket 1 while supporting the operation stick 5 by the assist device 30 according to the present invention.

As shown in FIGS. 2-13, the assist device 30 of the present invention has a fixture 4 that attaches to the upper peripheral edge 12 of the work bucket 1. As shown in FIGS. In the illustrated example, the cross-sectional shape is angular "h-shaped". In other words, the U-shaped portion (channel portion) 4C (opening downward) fitted in the upper peripheral edge portion 12 of the work bucket 1 from above, and the corners of the U-shaped portion 4C and an upper protruding piece portion 4H which is continuously provided in an upward protruding manner. In addition, (although not shown), for example, a screw hole is opened in a part of the U-shaped portion 4C which is opened downward, and a bolt is threaded into the screw hole so that the upper peripheral edge portion 12 In addition, it is desirable to attach and fix firmly.

Reference numeral 20 denotes a link arm mechanism. An arm base end portion 20E is attached to the fixture 4 so as to be rotatable around the vertical axis _L2 , and an arm tip portion 20P is positioned within a horizontal plane _P0 . 5 and 6, it horizontally moves left _NL , right _NR , forward _NF , and backward _NB . This is called "two-dimensional movement within one horizontal plane". 1, 2, and 3, the forward _NF means the operation stick from one side 12A of the upper peripheral edge portion 12 of the rectangular shape in plan view where the assist device 30 is attached to the bucket 1, as shown in FIGS. 5 defines the direction in which the plane view extends perpendicular to the side 12A. Therefore, from FIGS. 1, 2 and 3, left _NL , right _NR and rear _NB are also apparent.

Reference numeral 6 denotes a substantially Y-shaped stick receiver capable of receiving the operation stick 5 . Reference numeral 8 denotes a stick receiver holding member, which is specifically made of a strip material with a rounded tip. The holding member 8 is pivotally attached to the arm tip portion 20P so as to be vertically swingable about the horizontal axis _L3 .

The stick receiver 6 is composed of a bifurcated upper half portion 6A for receiving the operation stick 5 and a lower half short column portion 6B. A vertical slit 6S is formed through the short column portion 6B (see FIGS. 4 and 5). It is inserted (passed through) and fixed with a bolt 7 or the like.

Also, a large number of small mounting holes 9 are provided at a predetermined pitch in the longitudinal direction of the strip-like holding member 8 (see FIG. 14), so that when the bolt 7 or the like is pulled out, the small mounting holes 9 can be mounted at desired positions. The stick receiver 6 can be slid to a position corresponding to the hole 9 and held by the bolt 7 or the like. 4 to 9 and the like show the case where the stick receiver 6 is held (attached) by the bolt 7 in the small hole 9 at the extreme end position of the holding member 8. As shown in FIG.

Then, the first gas spring _S1 constantly elastically urges the stick receiver holding member 8 (and the stick receiver 6) upward about the horizontal axis _L3 ---see arrow _M1 ---. (see FIG. ₁₄ and FIGS. 4 to 6).

The first assist force exerting unit U ₁ comprises a stationary cam 14 fixed to a fixed shaft 13 having a horizontal axis L ₃ . On the other hand, a small casing 15 fixed to the base of the holding member 8 is capable of swinging around the axis _L13 via a bearing 16. is provided as freely swingable. A cam roller 18 and a gas spring roller 19 are pivoted near the tip of the swing arm 17 .

The rod 22 of the first gas spring _S1 abuts and presses the gas spring roller 19, presses the swing arm 17 (downward in the figure) around the first shaft 21, and the cam roller 18 engages the cam 14. press against.

By the way, there is no contact point (pressing point) between the cam 14 and the roller 18 on the extension of the axial center of the rod 22 of the first gas spring _S1. Then, the reaction force against the elastic pressing force of the first gas spring _S1 acts on the swing arm 17 and the rod 22 from the cam 14 in reverse. Thereby, a rotational moment indicated by an arrow M ₁ is applied to the holding member 8 .

By the way, the arm tip 20P of the link arm mechanism 20 or its vicinity is formed with a locking hole 23 opening downward.
As illustrated in FIGS. 4 to 9, the link arm mechanism 20 comprises an inverted L-shaped pipe 24 and a bearing outer cylindrical body 25 fixed to the upper end (tip) of the pipe 24 and formed at the lower end of the pipe 24. It is composed of a plurality of link units 26 each composed of a bearing insert portion. Therefore, the lower portion of the hole portion of the bearing outer cylindrical body 25H of the uppermost link unit 26 can be diverted to the locking hole 23 that opens downward.

4 to 9 and FIGS. 11 to 13, an insertion rod 31 is provided on the side surface (inner surface) 27 of the fixture 4 where the upper protruding piece 4H exists so as to be vertically movable. A link arm mechanism folded state holding means Y having a manual lever 32 which moves vertically and is inserted from below into the locking hole 23 having a downward opening (described above) is attached.

As shown in FIGS. 4 to 9 and 11 to 13, the stick receiver holding member 8 is in the form of a strip, and has a small attachment hole 9 along its longitudinal direction. Furthermore, a narrow width dimension slide guide groove 28 is formed in parallel therewith. _S2 is a second gas spring, and the upper end portion 41 of the second gas spring _S2 is slidably engaged with the slide guide groove .
Also, the lower end portion 42 of the second gas spring _S2 is pivotally attached to the bucket fixture 4 so as to be free to swing.

Then, as shown in FIGS. 7, 11, 2, and 4, the upper end portion of the second gas spring _S2 is held by the link arm mechanism folded state holding means Y while the link arm mechanism 20 is in the folded state. 41 (contacts) the upper end of the slide guide groove 28 and is in a press contact state.

In this way, the upper end 41 of the second gas spring _S2 presses against the upper end of the slide guide groove 28, causing the stick receiver holding member 8 to move upward around the horizontal axis _L3 (indicated by arrow M2 ₎ . ) to elastically rotate. Therefore, in the folded state of the link arm mechanism 20 shown in FIGS. 7 and 11, the elastic urging forces of the second gas spring _S2 and the first gas spring _S1 are combined and exerted.

As shown in FIG. 15, the shape of the inner surface of the stick receiver 6 (upper half 6A) for directly receiving the operation stick 5 (as a state of contact) is larger than the cross-sectional shape of the stick 5 having a circular outer diameter. It consists of a sufficiently large basic recess 34 and an arcuate lowermost minor recess 35 set to a radial dimension R ₁ equivalent to the radial dimension R ₅ of the circular cross section of the stick 5 .

Assuming that the radial dimension of the basic recessed portion 34 is R ₂ , it is desirable to set 2.5·R ₅ ≦R ₂ ≦5·R ₅ (Equation 1). Moreover, it is desirable that the following formula 2 holds between _R1 , which is the radial dimension of the small recess 35, and _R5 , which is the radial dimension of the stick 5.
1.05·R ₅ ≦R ₅ ≦1.5·R ₅ (Equation 2)

In Equation 2, if _R5 is less than the lower limit, it may be difficult for the stick 5 to fit. Conversely, when the upper limit is exceeded, it becomes difficult to maintain the stick 5 within a moderate restraint range.
In addition, if the value is less than the lower limit of Equation 1, it becomes difficult to swing the stick left and right relatively freely. Moreover, if the upper limit is exceeded, there is a risk that the stick 5 will unexpectedly detach from the basic concave portion 34 during operation.

2 and 3 show a state in which the operation stick 5 is directed straight forward _NF and various operations are being performed on the overhead wire 3 (not shown). It is used by swinging it to the right _NR , and FIG. 10B shows a state in which it is used by swinging it to the left _NL . As can be seen from the plan views shown in FIGS. 2, 3, 10A and 10B, the tip 5A of the operation stick 5 swings left and right and back and forth in a plan view, and covers the fan-shaped area as a whole. I know it can be done. Therefore, in the perspective view shown in FIG. 1, it is possible to carry out the work from the work bucket 1 in accordance with the content of the electrical work, from the position where the work is most comfortable, with a sufficiently small physical burden. At this time, the strong elastic biasing force of the second gas spring _S2 in the linear direction and the elastic force of the first support force exerting unit _U1 (having the first gas spring _S1 and the cam 14) in the direction of arrow _M1 Due to the supporting force, the physical burden on the worker M can be significantly reduced.
"Electrical work" as the application of the present invention is defined to include "communication line work."

As described in detail above, the present invention provides a mounting fixture 4 attached to the upper peripheral edge portion 12 of the upper opening box type work bucket 1 provided at the tip of the boom 11 of the aerial work vehicle 10; a link arm mechanism 20 in which an arm base end portion 20E is rotatably attached to the mounting fixture ₄ around a vertical axis L2, and an arm tip portion 20P horizontally moves left, right, front and back within a horizontal plane _P0 ; A substantially Y-shaped stick receiver 6 for receiving an _insulated operation stick 5; and a first support force having a _first gas spring _S1 that constantly elastically rotates the stick receiver holding member 8 upward about the horizontal axis _L3 . Since the structure is provided with the exerting unit _U1 , the middle part of the operation stick 5 is elastically supported at all times, and the stick tip 5A can be moved left, right, up, down, front and back, and various operations can be performed. can be done efficiently without getting tired. In particular, even when a rotary tool weighing 5kg to 12kg or a horizontal pipe member is attached to the tip of the stick 5, the link arm mechanism 20 and the first support force exerting unit _U1 provide sufficient elastic support. This can significantly reduce the physical burden on workers. Moreover, the mounting tool attached to the tip 5A of the operation stick can be moved vertically, horizontally, and back and forth, so that the entire work can be performed easily and smoothly (with a reduced physical burden).

A lock hole 23 opening downward is formed in the arm distal end portion 20P of the link arm mechanism 20 or in the vicinity thereof; and a manual lever 32 for moving the insertion rod 31 vertically and for inserting it into the locking hole 23 opening downward from below. Since it is attached to the fixture 4, even when a heavy tool or the like is attached to the tip 5A of the operation stick 5, the operation stick 5 can be reliably maintained in a stable posture, and work can be performed efficiently and safely. can do

The stick receiver holding member 8 has a strip _- like shape and is formed with a slide guide groove ₂₈ in the longitudinal direction; 41 is slidably engaged with the slide guide groove 28, and the lower end 42 is pivotally attached to the bucket fixture 4; Then, the upper end portion 41 of the second gas spring _S2 comes into pressure contact with the upper end of the slide guide groove 28, and elastically urges the stick receiver holding member 8 upward about the horizontal axis _L3 . Because of this configuration, the operation can be performed smoothly with the operation stick 5 while always being supported by the first gas spring _S1 throughout the operation, and the stick tip 5A can be moved over a wide range in the left, right, front, and rear directions. In addition to being able to work by moving the attached work tool, a straight elastic biasing force can be added by the second gas spring _S2 as needed, so that a large load can be handled.

In addition, the shape of the inner surface of the stick receiver 6 that directly receives the operation stick 5 is equivalent to the basic concave portion 34 sufficiently larger than the cross-sectional shape of the stick 5 and the radial dimension R ₅ of the circular cross-sectional shape of the stick 5. , and the arc-shaped lowermost small concave recess 35 set to the radial dimension R ₁ . In the past, there was a risk that the operation would become difficult due to the swaying, but in the present invention, such unstable swaying can be prevented, and delicate work can be stably performed with the tip tool of the operation stick 5. .

REFERENCE SIGNS LIST 1 work bucket 4 fixture 5 operation stick 6 stick receiver 8 stick receiver holding member
10 aerial work platform
12 upper peripheral edge
20 link arm mechanism
20E arm proximal end
20P arm tip
23 locking hole
28 Slide guide groove
31 Insertion rod
32 Manual lever
34 basic recess
35 Arc-shaped bottom small recess
41 top edge
42 Lower end L ₂ Vertical axis L ₃ Horizontal axis M ₁ Spring rotation bias (arrow)
P ₀ One horizontal plane R ₁ Radial dimension R ₅ Radial dimension S ₁ First gas spring S ₂ Second spring U ₁ First support force exerting unit Y Link arm mechanism folded state holding means

Claims (4)

a fixture (4) attached to the upper peripheral edge (12) of a box-shaped work bucket (1) with an upward opening provided at the tip of a boom (11) of an aerial work vehicle (10);
An arm base end (20E) is attached to the fixture (4) so as to be rotatable around a vertical axis (L ₂ ), and an arm tip (20P) moves left and right in a horizontal plane (P ₀ ). a link arm mechanism (20) that moves horizontally to
a substantially Y-shaped stick receiver (6) for receiving the insulating operation stick (5);
a stick receiver holding member (8) to which the stick receiver (6) is attached and which is pivotally attached to the tip of the arm (20P) so as to be vertically swingable about the horizontal axis ( _L3 );
A first support _{force exerting} unit ₍ U ₁ ) and
An assist device for high-place electrical work, characterized by comprising: A locking hole (23) opening downward is formed in the arm tip (20P) or the vicinity of the arm tip (20P) of the link arm mechanism (20),
Further, the fixture (4) includes an insertion rod (31) movable in the vertical up-down direction, and an engaging hole ( 23) The assist for electrical work at height according to claim 1, wherein a link arm mechanism folded state holding means (Y) provided with a manual lever (32) to be inserted from below is attached to the bucket fixture (4). Device. The stick receiver holding member (8) is in the form of a strip plate, and has a slide guide groove (28) formed in the longitudinal direction,
Further, a second gas spring (S ₂ ) is provided, the upper end (41) of the second gas spring (S ₂ ) is slidably engaged with the slide guide groove (28), and the lower end (42) is is pivotally attached to said bucket fixture (4),
Under the folded state of the link arm mechanism (20), the upper end (41) of the second gas spring (S ₂ ) moves into the slide guide groove (28) by the link arm mechanism folded state holding means (Y). so as to press against the upper end of the stick receiver holding member (8) to elastically rotate upward about the horizontal axis (L ₃ ).
3. The assist device for high place electrical work according to claim 2. A basic concave portion (34) in which the shape of the inner surface of the stick receiver (6) for directly receiving the operation stick (5) is sufficiently larger than the cross-sectional shape of the stick (5), and the cross-section of the stick (5) 4. An assist for electrical work at high altitude according to claim 1, 2 or 3, comprising an arcuate lowermost small recess ( ₃₅ ) set to a radius dimension (R1) equal to the radius dimension ( _R5 ) of the circular shape. Device.

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