Assist device for electrical work at height

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]

[0001] The present invention relates to an assist device for electrical work at high altitudes. [Background technology]

[0002] For high-altitude electrical work, workers were riding on a work bucket installed at the tip of the boom in high-altitude work vehicles to carry out electrical work on overhead electrical wires. At this time, the worker inside the work bucket holds the insulating operation stick (see Patent Documents 1 and 2) with both hands to perform the work operation.

[0003] Recently, the work equipment attached to the tip of the insulating stick has become more complicated and the weight is gradually increasing. Therefore, a technology has been proposed to install the base of an insulating stick in a work bucket of a high-altitude work vehicle (see Patent Documents 3 and 4). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 3-3110 [Patent Document 2] JP 2019-161778 A [Patent Document 3] JP 2017-103863 A [Patent Document 4] JP 2000-324637 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the invention described in Patent Document 3, the operation stick is installed in a vertical position on the inner bottom wall surface of the work bucket. Therefore, it is necessary to move the work bucket to a position directly below the overhead power lines, and there are drawbacks in that it is difficult to perform complex and delicate electrical work, and the worker must work while looking directly upward, which puts strain on the body.

[0006] 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, which reduces the physical burden on the worker. However, the relative positional relationship between the overhead electric wire and the work bucket in the up-down, front-back, and left-right directions is fixed and cannot be easily changed, which means that various electrical work on the overhead electric wire cannot be carried out smoothly, and there is a drawback in that work efficiency is significantly reduced. Especially in urban areas, overhead electric wires are often congested, and the work bucket of the aerial work vehicle may not be able to easily approach the electric wires to be worked on. In such cases, the worker must attach a heavy rotating tool or horizontal pipe member to the tip of the operation stick and support the base end while working. This means that the worker must operate the operation stick from a somewhat distant position in an awkward posture, and the burden on the worker in handling the operation stick with the center of gravity biased toward the tip is great.

[0007] Therefore, the present invention aims to provide an assist device that eliminates such conventional drawbacks, significantly reduces the physical burden (reducing fatigue) on a worker riding in the work bucket of an aerial work vehicle, and enables electrical work to be performed efficiently, accurately, and with high quality.

[0008] Furthermore, another object of the present invention is to provide an assist device that enables an operator to smoothly respond to changes in the relative position between the work bucket and the part of the (congested) overhead wire being worked on, and to perform accurate and high-quality work, even if such changes occur left / right, up / down, or front / back. [Means for solving the problem]

[0009] Therefore, the present invention comprises a mounting fixture that is attached to the upper peripheral edge of an upward-opening box-shaped work bucket provided at the tip of the boom of aerial work vehicle; a link arm mechanism in which the base end of an arm is attached to the mounting fixture so as to be rotatable about a vertical axis and the tip of the arm moves horizontally left and right and front and back within a single horizontal plane; a roughly Y-shaped stick receiver that holds an insulated operating stick; a stick receiver holding member to which the stick receiver is attached and which is pivoted to the tip of the arm so as to be able to swing up and down about a horizontal axis; and a first assist force exerting unit which has a first gas spring that constantly urges the stick receiver holding member to rotate upwards about the horizontal axis.

[0010] In addition, a downwardly opening engagement hole is formed at or near the arm tip of the link arm mechanism; and further, the attachment tool is provided with a link arm mechanism folded state maintaining means, which includes an insertion rod that can be moved in the vertical up-down direction, and a manual lever that moves the insertion rod in the vertical up-down direction and inserts it from below into the downwardly opening engagement hole.

[0011] The stick receiver holding member is shaped like a strip and has a slide guide groove formed in the longitudinal direction; it further comprises a second gas spring, the upper end of which slidably engages with the slide guide groove and the lower end of which is pivotally attached to the bucket mounting fixture; and the link arm mechanism folded state holding means causes the upper end of the second gas spring to be in pressure contact with the upper end of the slide guide groove when the link arm mechanism is in the folded state, thereby resiliently rotating the stick receiver holding member upwards around the horizontal axis;

[0012] In addition, the inner surface shape of the stick receiver, which directly receives the operating stick, comprises a basic concave portion that is sufficiently larger than the cross-sectional shape of the stick, and an arc-shaped lowermost small concave portion whose radius is set to the same as the radius of the circular cross-section of the stick. Effect of the Invention

[0013] According to the present invention, by holding the middle part of the operating stick on the stick receiver, the tip of the stick receiver can be freely moved left and right, up and down, front and back as the worker wishes, and from the work bucket stationary at a fixed spatial position, the worker can easily, smoothly and quickly strip (strip), cut, tap and perform other various works (tapes) of overhead electric wires with less fatigue. In particular, even when a heavy rotating tool or horizontal pipe member is attached to the tip of the operating stick, the middle position (near the base end) of the operating stick is supported by the elastic support force of the support force exerting unit, and electrical work can be performed smoothly and efficiently while reducing the physical burden on the worker. [Brief description of the drawings]

[0014] [Figure 1] 1 is an overall perspective view showing an example of a used state; FIG. [Diagram 2] FIG. 1 shows one embodiment of the present invention, in which an operator holds the operating stick in his / her hand, points the operating stick directly forward from the work bucket, and swings the operating stick upward to the maximum inclination angle, in order to achieve the maximum swing-up posture, in which (A) is a plan view and (B) is a side view. [Diagram 3] FIG. 13 shows the maximum forward reclining position in which an operator holds the operating stick in his / her hand, points the operating stick directly forward from the work bucket, and brings the operating stick closer to horizontal, where (A) is a plan view and (B) is a side view. [Figure 4] 3 is an enlarged view of the main parts corresponding to the maximum swinging posture of FIG. 2, where (A) is an enlarged view of the main parts of the plane, and (B) is an enlarged view of the main parts of the sides. [Diagram 5] 3 shows the intermediate tilt posture in FIG. 2 and FIG. 3, with (A) being a plan view and (B) being a side view. [Figure 6] 4 is an enlarged view of the main part corresponding to the maximum forward lying posture in FIG. 3, (A) is an enlarged view of the main part of the plane, and (B) is an enlarged view of the main part of the side. [Figure 7] 4B is an enlarged side view of FIG. 4B as seen from another side. [Figure 8] 5B is an enlarged side view of FIG. 5B as seen from another side. [Figure 9] 6B is an enlarged side view of FIG. 6B as seen from another side. [Figure 10] 3A is a plan view, in which (A) is a plan view showing the state in which the operation stick is swinging rightward, and (B) is a plan view showing the state in which the operation stick is swinging leftward. [Figure 11] 1 is a side view showing the state in the maximum swing posture and swinging rightward. [Figure 12] 1 is a side view showing a state in a mid-sloping position and swinging rightward. [Figure 13] 10 is a side view showing the state in which the position is lying in the maximum forward position and swings rightward. [Figure 14] 1 is an enlarged cross-sectional side view showing the first support force exertion unit having a first gas spring and the stick support holding member. [Figure 15] 1 is a cross-sectional view of a main part of a stick receiver. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention will now be described in detail based on the illustrated embodiment. In Fig. 1, 10 denotes a vehicle for working at height, 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 approach an electric wire (overhead electric wire) 3 suspended above electric poles 2, 2, as shown in Fig. 1. In principle, the work bucket 1 is brought close to and stopped just before and slightly below the electric wire 3.

[0016] The assist device 30 according to the present invention is attached to a part of the upper peripheral edge 12 of the work bucket 1. A worker M gets into the work bucket 1, and from within the bucket 1, performs various electrical work (tasks) while the operating stick 5 is supported by the assist device 30 according to the present invention.

[0017] As shown in Figs. 2 to 13, the assist device 30 of the present invention has a mounting fixture 4 attached to the upper peripheral edge 12 of the work bucket 1. In the illustrated example, the cross-sectional shape is an "H-shape" with an angular edge. In other words, it is composed of a (downwardly open) 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 protruding piece portion 4H that is connected to the corner of the U-shaped portion 4C and protrudes upward. Note that it is preferable to, for example, open a screw hole in a part of the downwardly open U-shaped portion 4C and screw a bolt into the screw hole to firmly attach and fix it to the upper peripheral edge 12 (although not shown).

[0018] 20 is a link arm mechanism, and the arm base end 20E is the vertical axis L on the mounting device 4. 2 It is attached to the arm tip 20P, which is rotatable around it, and has a horizontal surface P 0 Within this, as shown in Figures 4, 5 and 6, the left N L ·Right N R Forward N F ·Backward N B Move horizontally to. This is called "two-dimensional movement in one horizontal plane." Furthermore, the front N F 1, 2 and 3, the direction in which the operation stick 5 extends perpendicularly to the side 12A in a plan view from one side 12A of the upper peripheral edge portion 12 of the quadrangle in plan view where the assist device 30 is attached to the bucket 1. Therefore, from FIG. 1, FIG. 2 and FIG. 3, the left side N L ,right N R ,backward N B also becomes clear.

[0019] Reference numeral 6 denotes a stick receiver having a substantially Y-shape capable of receiving the operation stick 5. Reference numeral 8 denotes a stick receiver holding member, specifically made of a strip plate material having a rounded tip. The holding member 8 is attached to the arm tip portion 20P along the horizontal axis L. 3 It is pivoted around it, allowing it to swing up and down freely.

[0020] The above stick receiver 6 is composed of a bifurcated upper half 6A for receiving the operation stick 5 and a lower short column part 6B. A vertical slit 6S is provided through the short column part 6B (see FIGS. 4 and 5). A strip-shaped stick receiver holding member 8 is inserted (inserted through) into this slit 6S from its tip and fixed with bolts 7 or the like.

[0021] Also, a large number of small mounting holes 9... are provided through the longitudinal direction of the strip-shaped holding member 8 at a predetermined pitch (see FIG. 14). If the bolts 7 or the like are removed, the stick receiver 6 can be slid to a position corresponding to the small hole 9 at the desired position and held by the bolts 7 or the like. FIGS. 4 to 9 etc. show the case where the stick receiver 6 is held (attached) with a bolt 7 at the small hole 9 at the foremost end position of the holding member 8.

[0022] And the stick receiver holding member 8 (and the stick receiver 6) is 3 constantly elastically rotationally biased upward around the horizontal axis L ─── arrow M 1 referring ─── to the first gas spring S 1 of the first support force exerting unit U 1 which is provided (see FIGS. 14 and FIGS. 4 to 6).

[0023] The first support 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, the small casing 15 fixed to the base of the holding member 8 is swingable around the axis L 13 via a bearing 16. An oscillating arm 17 is provided in this small casing 15 so as to be swingable around the first shaft 21. Near the oscillating tip of this oscillating arm 17, a cam roller 18 and a gas spring roller 19 are pivotally attached.

[0024] The rod 22 of the first gas spring S 1 abuts against and presses the gas spring roller 19, pressing the oscillating arm 17 (downward in the figure) around the first shaft 21, and the cam roller 18 is pressed against the cam 14.

[0025] By the way, the first gas spring S 1 The contact point (pressure point) between the cam 14 and the roller 18 does not exist on the extension line of the axis of the rod 22. Furthermore, due to the setting of the cam contact curve of the cam 14, the first gas spring S 1 A reaction force against the elastic pressing force of acts on the swing arm 17 and the rod 22 from the cam 14. As a result, the arrow M 1 A rotational moment shown in FIG.

[0026] Incidentally, a downwardly opening engaging hole 23 is formed at the arm tip 20P of the link arm mechanism 20 or in the vicinity thereof. 4 to 9, the link arm mechanism 20 is made up of a plurality of link units 26, each of which is made up of an inverted L-shaped pipe 24, a bearing outer cylinder body 25 fixed to the upper end (tip) of the pipe 24, and a bearing insertion portion formed at the lower end of the pipe 24. Therefore, the lower part of the hole of the bearing outer cylinder body 25H of the uppermost link unit 26 can be used as the aforementioned downwardly opening locking hole 23.

[0027] 4 to 9 and 11 to 13, a link arm mechanism folded state maintaining means Y is attached to the side surface (inner surface) 27 on which the upper protrusion portion 4H of the mounting fixture 4 is present, the link arm mechanism having a manual lever 32 which is movable in the vertical direction to move the insertion rod 31 in the vertical direction and which is inserted from below into the downward-opening engagement hole 23 (mentioned above).

[0028] As shown in Figures 4 to 9 and Figures 11 to 13, the stick receiver holding member 8 is in the shape of a strip, and has a small attachment hole 9 arranged along its longitudinal direction, and further has a narrow slide guide groove 28 formed parallel to the small attachment hole 9. 2 is a second gas spring, and this second gas spring S 2 The upper end portion 41 of the support 40 is slidably engaged with the slide guide groove 28 . In addition, the second gas spring S 2The lower end 42 is pivotally attached to the bucket mounting fixture 4 so as to be freely swingable.

[0029] 7, 11, 2 and 4, the link arm mechanism folded state holding means Y holds the second gas spring S in the folded state of the link arm mechanism 20. 2 The upper end portion 41 of the slide guide groove 28 comes into pressure contact with the upper end of the slide guide groove 28 .

[0030] In this way, the second gas spring S 2 The upper end 41 of the stick receiver holding member 8 is pressed against the upper end of the slide guide groove 28, so that the stick receiver holding member 8 is moved toward the horizontal axis L 3 Around and up (arrow M 2 Therefore, when the link arm mechanism 20 is in the folded state shown in Figs. 7 and 11, the second gas spring S 2 and No. 1 Gas Spring S 1 The result is a state in which the combined elastic forces of the two are exerted.

[0031] As shown in FIG. 15, the inner surface shape of the stick receiver 6 (upper half 6A) that directly receives the operating stick 5 (in abutting state) has a basic concave portion 34 that is sufficiently larger than the outer circular cross-sectional shape of the stick 5, and a radius R 5 Equivalent radius dimension R 1 and a circular arc-shaped lowermost small recess 35 set at

[0032] The radius of the basic recess 34 is R 2 Then, 2.5·R 5 ≦R 2 ≦5·R 5 It is preferable to set the radius of the small recess 35 as shown in (Formula 1). 1 and the radius dimension of stick 5 is R 5 It is desirable that the following formula 2 be satisfied between 1.05 R 5 ≦R 5 ≦1.5·R 5 (Formula 2)

[0033] In the above formula 2, R 5 If the value is less than the lower limit, it may be difficult to fit the stick 5. Conversely, if the value is more than the upper limit, it may be difficult to maintain the stick 5 within an appropriate restraint range. Furthermore, in the above formula 1, if the value is below the lower limit, it becomes difficult to swing the stick left and right relatively freely. If the value exceeds the upper limit, there is a risk that the stick 5 may suddenly come off the basic concave portion 34 during work.

[0034] In Figures 2 and 3, the control stick 5 is pushed straight forward (N F In FIG. 10(A), the operation stick 5 is moved to the right N R In Fig. 10(B), the left N L 2, 3, and 10(A) and (B), the tip 5A of the operating stick 5 can be swung left and right and forward and backward in a plan view, covering a sector-shaped area overall. Therefore, in the perspective view shown in FIG. 1, from the work bucket 1, it is possible to carry out electrical work from the most convenient position with sufficiently little physical strain depending on the type of work. At this time, the second gas spring S 2 Strong elastic force in the linear direction, and (First gas spring S 1 and cam 14) first support force exerting unit U 1 Arrow M 1 The elastic support force in the direction can significantly reduce the physical burden on the worker M. In addition, for the purposes of this invention, "electrical work" is defined to include "communication line work."

[0035] As described above in detail, the present invention relates to a mounting fixture 4 attached to the upper peripheral edge portion 12 of an upwardly opening box-shaped work bucket 1 provided at the tip of a boom 11 of a high-altitude work vehicle 10; 2 The arm tip 20P is attached so as to be rotatable around the horizontal plane P 0a link arm mechanism 20 that moves horizontally left and right and forward and backward within the link arm mechanism 20; a substantially Y-shaped stick receiver 6 that receives the insulating operation stick 5; and a horizontal axis L of the arm tip 20P. 3 a stick receiver holding member 8 pivotally mounted around the horizontal axis L so as to be able to swing up and down; 3 Constantly revolving upwards around the 1 The first gas spring S 1 The first support unit U 1 Since the configuration is provided with the above, the middle portion of the operation stick 5 is always supported elastically, and the stick tip 5A can be moved left and right, up and down, forward and backward, and various tasks can be efficiently performed without getting tired. In particular, even when a heavy rotary tool or horizontal pipe member weighing 5 kg to 12 kg is attached to the tip of the stick 5, the link arm mechanism 20 and the first assisting force exerting unit U are sufficiently supported. 1 The elastic support by the actuator significantly reduces the physical burden on the operator. Moreover, the tool attached to the tip 5A of the operation stick can be moved up and down, left and right, and back and forth, making it possible to perform the entire work easily and smoothly (reducing the physical burden).

[0036] In addition, a downward-opening engagement hole 23 is formed at or near the arm tip 20P of the link arm mechanism 20; and further, the mounting fixture 4 is provided with a link arm mechanism folded state maintaining means Y which includes an insertion rod 31 that can be moved vertically up and down, and a manual lever 32 that moves the insertion rod 31 in the vertical direction and inserts it into the downward-opening engagement hole 23 from below.Therefore, even when a heavy tool or the like is attached to the tip 5A of the operating stick 5, the operating stick 5 can be reliably maintained in a stable posture, and work can be performed efficiently and safely.

[0037] The stick receiver holding member 8 is in the form of a strip, and a slide guide groove 28 is formed in the longitudinal direction. 2 The second gas spring S 2The upper end 41 of the second gas spring S is slidably engaged with the slide guide groove 28, and the lower end 42 is pivotally attached to the bucket mounting fixture 4; the second gas spring S is supported by the link arm mechanism folded state holding means Y when the link arm mechanism 20 is in the folded state. 2 The upper end portion 41 of the slide guide groove 28 is pressed against the upper end of the slide guide groove 28, and the stick receiver holding member 8 is moved toward the horizontal axis L 3 The first gas spring S is always rotating upwards in the direction of the arrow. 1 The operation stick 5 is supported by the second gas spring S, and the operation can be performed smoothly and over a wide range in the left and right, front and rear directions by moving the stick tip 5A - by moving the attached work tool - and, if necessary, the second gas spring S 2 This allows for a straight elastic force to be applied, making it possible to handle large loads.

[0038] The stick receiver 6 has an inner surface that directly receives the operating stick 5, and a basic concave portion 34 that is sufficiently larger than the cross-sectional shape of the stick 5, and a radius R 5 Equivalent radius dimension R 1 and the arc-shaped bottom small recess 35 set at 35°. If the arc-shaped bottom small recess 35 did not exist, there was a risk in the past that the operating stick 5 would swing unstably from side to side, making work difficult. However, with the present invention, such unstable swinging is prevented, and delicate work using the tool at the tip of the operating stick 5 can be performed stably. [Explanation of symbols]

[0039] 1 Work bucket 4 Mounting fixture 5 Control Stick 6 Stick holder 8 Stick receiver holding member 10. Aerial work platform 12 Upper peripheral edge 20 Link arm mechanism 20E Arm base end 20P Arm tip 23 Locking hole 28 Slide guide groove 31 Insertion rod 32 Manual Lever 34 Basic concave part 35 Circular arc-shaped small concave portion at bottom 41 Upper end 42 Lower end L 2 vertical axis L 3 horizontal axis M 1 Spring rotation force (arrow) P 0 one horizontal plane R 1 Radial dimensions R 5 Radial dimensions S 1 First gas spring S 2 2nd Spring U 1 1st Support Unit Y-link arm mechanism folded state holding means

Claims

1. a mounting fixture (4) attached to an upper peripheral edge portion (12) of an upwardly opening box-shaped work bucket (1) provided at the tip of a boom (11) of a vehicle for working at height (10); The arm base end (20E) is aligned with the vertical axis (L 2 The arm tip (20P) is attached so as to be rotatable around a horizontal plane (P 0 A link arm mechanism (20) that moves horizontally left and right and forward and backward within the A substantially Y-shaped stick receiver (6) for receiving an insulating operation stick (5); The stick receiver (6) is attached, and the horizontal axis (L 3 a stick receiver holding member (8) pivotally mounted around the stick receiver (1) so as to be able to swing up and down; The stick receiver holding member (8) is aligned with the horizontal axis (L 3 ) around the upper part, constantly spring-rotating (M 1 ) the first gas spring (S 1 ) having the first support force exertion unit (U 1 ) And, Equipped with A downwardly opening engaging hole (23) is formed at or near the arm tip (20P) of the link arm mechanism (20), Furthermore, the mounting fixture (4) is provided with a link arm mechanism folded state maintaining means (Y) including an insertion rod (31) movable in the vertical up-down direction and a manual lever (32) for moving the insertion rod (31) in the vertical up-down direction and inserting it from below into the downward-opening engagement hole (23), thereby providing an assist device for high-altitude electrical work.

2. The stick receiver holding member (8) is in the shape of a strip, and has a slide guide groove (28) formed in the longitudinal direction. In addition, the second gas spring (S 2 ), and the second gas spring (S 2 The upper end (41) of the slide guide groove (28) is slidably engaged with the slide guide groove (28), and the lower end (42) is pivotally attached to the mounting fixture (4). The link arm mechanism folded state holding means (Y) holds the second gas spring (S) in the folded state of the link arm mechanism (20). 2 The upper end portion (41) of the slide guide groove (28) is pressed against the upper end of the slide guide groove (28), and the stick receiver holding member (8) is aligned with the horizontal axis (L 3 ) to be biased upwards in a resilient rotation.

2. An assist device for electrical work at height according to claim 1,

3. The stick receiver (6) has an inner surface shape for directly receiving the operating stick (5) that is sufficiently larger than the cross-sectional shape of the stick (5) and a basic concave portion (34) that is sufficiently larger than the cross-sectional shape of the stick (5). 5 ) and the radial dimension (R 1 3. The assist device for electrical work at height as claimed in claim 1 or 2, further comprising a circular arc-shaped lowermost small recess (35) set at the center of the workpiece.

4. A mounting fixture (4) attached to an upper peripheral edge portion (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 link arm mechanism (20) whose arm base end (20E) is attached to the mounting fixture (4) so ​​as to be rotatable about a vertical axis (L2) and whose arm tip end (20P) moves horizontally left and right and forward and backward within a single horizontal plane (P0); A substantially Y-shaped stick receiver (6) for receiving an 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 arm tip (20P) so as to be vertically swingable about a horizontal axis (L3); a first assisting force exerting unit (U 1 ) having a first gas spring (S 1 ) for constantly applying a spring force (M 1 ) to the stick receiver holding member (8) upward around the horizontal axis (L 3 ); And, Equipped with The stick receiver (6) has an inner surface shape for directly receiving the operating stick (5), which has a basic concave portion (34) that is sufficiently larger than the cross-sectional shape of the stick (5), and a circular arc-shaped lowermost small concave portion (35) set to a radius dimension (R 1 ) equivalent to the radius dimension (R 5 ) of the circular cross-sectional shape of the stick (5). This assist device for high-altitude electrical work comprises:

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