JP2563295Y2 - Telescopic boom insulation device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic boom insulating device mounted on a crane truck, an aerial work vehicle or the like.

[0002]

2. Description of the Related Art For example, an aerial work vehicle is provided with a telescopic boom provided with a work table for a worker to ride on at an end thereof. The telescopic boom includes a base end boom (which may be composed of an uppermost base boom and an intermediate boom that is telescopically inserted into the base end boom) which is attached to the vehicle body (base) so as to be able to move up and down. And a distal end boom inserted into the end boom (intermediate boom) so as to be able to expand and contract. In an aerial work vehicle used for construction of power distribution facilities, etc. (hereinafter referred to as an aerial work vehicle), the base end boom is formed of a steel material due to its strength. It is formed of an electrically insulating material. As a result, even if the end boom or the workbench contacts the electric wire stretched over the telephone pole, the workbench and the vehicle body (ground) are kept insulated, resulting in a short circuit between the electric wire and the ground or work. It is possible to prevent a worker on the table from being electrically shocked.

[0003]

[Problems to be Solved by the Invention] However, the aerial work vehicles for electric installations run on rails for railways, and are used for maintenance and inspection of trolley wires and other distribution equipment installed along the rails for railways. Some are used. Here, when working with the telescopic boom extended below the trolley line so as to pass under the trolley line stretched at a relatively low position corresponding to the height of the train, The upper surface of the end boom may come into contact with the trolley wire. In this case, as described above, since the base end boom is made of a steel material, that is, a conductive material, there is a problem that a short circuit is likely to occur between the trolley wire and the rail.

[0004] The present invention has been made in view of such a problem, and a telescopic boom which can safely perform work even when a trolley wire for railway or the like comes into contact with a base end portion of the telescopic boom. It is intended to provide an insulating device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a telescopic boom, which is provided at least on a vehicle body of a traveling vehicle so as to be able to raise and lower, is attached to the vehicle body so as to be able to raise and lower. A steel base boom, a steel middle boom nested within this base boom and telescopic in the axial direction, and a steel boom nested within this middle boom and axially Consisting of a distal boom made of telescopic electrically insulating material, an insulating cover for the base boom is attached over the upper and left and right sides of the base boom, and an insulating cover for the intermediate boom is mounted on the upper and right and left sides of the intermediate boom. The middle boom insulating cover is extended and retracted with the middle boom with respect to the base boom, and is retracted between the base boom and the base boom insulating cover when the middle boom is fully retracted. Is It has become way.

[0006]

According to the insulating device having such a configuration, the base end boom and the intermediate boom are generally made of steel in view of strength requirements. Is also covered by the insulating cover, so that even when the base end boom and the intermediate boom come into contact with the trolley wire, no short circuit occurs between the trolley wire and the rail or the ground via the boom. Furthermore, even if the intermediate boom expands and contracts, the insulating cover for the intermediate boom expands and contracts together with the intermediate boom, and the insulating property does not change due to the expansion and contraction of the intermediate boom. At this time, the proximal boom is covered with the insulating cover for the proximal boom. The insulation of the proximal boom does not change. That is, in the case of the insulating device of the present invention, the electrical insulation of the entire boom can be always ensured, and the insulation performance is not affected by the expansion and contraction operation of the boom. In addition, since both insulating covers cover only the upper and left and right side surfaces of the boom and the lower surface side is open, the insulating covers can be easily attached to and detached from the boom.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, a track-and-rail aerial work vehicle equipped with a telescopic boom having an insulating device according to the present invention will be described with reference to FIG. This aerial work platform 30
Are configured on the basis of a truck running on a road. For this reason, tires 32 are attached to the front, rear, left and right of the vehicle body 31, respectively. At the front of the car body 31,
A swivel 33 that can freely turn with respect to the vehicle body 31 is attached. A multi-stage telescopic boom (hereinafter simply referred to as telescopic boom) 34 is attached to the upper part of the swivel base 33.

As shown in detail in FIG. 1, the telescopic boom 34 has a most proximal boom 34a pivotally attached to the swivel base 33 so as to be able to move up and down, and a middle boom 34a that is telescopically inserted into the most proximal boom 34a. And a boom 34b.
Note that the most proximal boom 34a and the middle boom 34
b corresponds to the “proximal boom” in the claims for utility model registration. The most proximal boom 34a and the intermediate boom 34b are formed in a prismatic shape from a steel material (conductive material). Further, the telescopic boom 34 includes a distal end boom (“distal end side boom” in the claims) 34 c inserted into the intermediate boom 34 b so as to be extendable and retractable.
This tip boom 34c is made of fiber reinforced plastic (FR
P), that is, a prismatic shape formed of an electrically insulating material.

A work table 35 is attached to the tip of the tip boom 34c. Also, iron wheels 3 are provided on the front, rear, left and right of the vehicle body 31 (but behind each tire 32).
6 is attached so that it can be extended and stored.

The track-and-rail aerial work vehicle 3 constructed as described above
0 is a railway rail (hereinafter simply referred to as a rail)
The vehicle travels on the road and moves to near the work site located along R. At this time, each iron wheel 36 is stored so as to be lifted with respect to the vehicle body 31 as shown by a chain line in the figure. At the railroad crossing near the work site,
The work vehicle 30 that has stopped so as to cross the vehicle body lifts its own vehicle body 31 by extending the center jack 38 attached to the lower center of the vehicle body 31 downward. Then, the vehicle body 31 is turned around the center jack 38 so as to be parallel to the rail R. Here, each iron wheel 36 is extended so as to be lowered downward as shown in the figure. Thereafter, the center jack 38 is reduced, and each iron wheel 36 is placed on the rail R for railway. At this time, each tire 32 also contacts the rail R. Therefore, by driving the tire 32, the work vehicle 30 can travel on the rail R and arrive at the work site. And the worker who boarded the workbench 35 moves the boom 34 up and down, expands and contracts,
The work can be performed at an arbitrary high place, such as above the rail R for railways, by performing a turning operation through the operation of the turning table 33.

Here, a trolley wire T is stretched above the railway rail R. The trolley wire T is
It is set at a low position corresponding to the height of the train. Therefore, when the telescopic boom 34 is erected under the lower part thereof, as shown in FIG.
Is turned 90 degrees to the vehicle body 31), and the trolley wire T may come into contact with the upper surface of the most proximal boom 34a or the middle boom 34b. Therefore, the insulating device 10 is attached to the telescopic boom 34.

The insulating device 10 includes a base end boom 34a.
And an insulating cover 11 for the most proximal end boom and an insulating cover 12 for the intermediate boom attached to the intermediate boom 34b. Both insulating covers 11 and 12 are longitudinal members formed by the above-mentioned FRP so as to have a U-shaped cross section. As shown in detail in FIG. 2, the most proximal boom insulating cover 11 is attached so as to cover the upper surface of the most proximal boom 34a and about the upper half of both side surfaces with the opening thereof facing downward. I have. The insulating cover 11 is attached to the proximal-most boom 34a via a proximal-end mounting stay 13 that extends laterally from both side surfaces near the distal end and the proximal end of the proximal-most boom 34a. The inner surface of the insulating cover 11 and the most proximal boom 34a
An appropriate gap is provided between the outer surface of the first member and the second member.

Similarly, the insulating cover 12 for the intermediate boom, like the insulating cover 11 for the most proximal boom, covers the upper surface of the intermediate boom 34b and a part of the upper side of both side surfaces with its opening directed downward. Attached to. However, the intermediate boom insulating cover 12 is arranged so as to be inserted into a gap between the most proximal boom insulating cover 11 and the most proximal boom 34a. The attachment of the insulating cover 12 to the intermediate boom 34b is performed via an intermediate attachment stay 14 attached to the front end of the intermediate boom 34b so as to extend laterally from both side surfaces.

Further, a slider 15 is attached to the upper inner surface on the base end side of the intermediate boom insulating cover 12. When the intermediate boom 34b expands and contracts with respect to the most proximal boom 34a, the slider 15
The base end portion of the intermediate boom insulating cover 10a that moves together with b is guided with respect to the upper surface of the most proximal boom 34a. Thus, the intermediate boom insulating cover 12 connected only to the intermediate boom 34b by the intermediate mounting stay 14 can be stabilized.

The provision of the insulating device 10 configured as described above makes it possible to avoid direct contact of the trolley wire T with the upper surfaces of the most proximal boom 34a and the intermediate boom 34b. Therefore, a short circuit between the trolley wire T and the vehicle body 31 and the rail R can be prevented, and the operation can be performed safely.

[0016]

As described above, the use of the insulation device of the present invention makes it possible for the boom to come into contact with a trolley wire or the like when the boom is turned, raised and lowered, and expanded and contracted on a track or the like. Even at this time, the insulation cover only comes into contact with the trolley wire or the like, and a short circuit between the trolley wire and the rail or the ground via the boom can be reliably prevented, and the safety is high.
Even if the boom is extended or retracted, the insulating cover for the intermediate boom is extended and retracted together with the intermediate boom to always cover the intermediate boom made of steel, and the proximal boom made of steel remains covered by the insulating cover for the proximal boom. Therefore, the insulating property does not change with the expansion and contraction of the boom. That is, in the case of the insulation device of the present invention, the electrical insulation of the entire boom can be always ensured, and the insulation performance is not affected by the expansion and contraction operation of the boom, and the safety is excellent. Further, since both insulating covers only cover the upper and right and left side surfaces of the boom and are open on the lower surface side, the insulating cover can be easily attached to and detached from the boom, and the assembling property of the insulating cover is good.

[Brief description of the drawings]

FIG. 1 is a side view of the telescopic boom insulating device according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a side view of an aerial work platform equipped with the telescopic boom.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Insulation device 11, 12 Insulation cover 13, 14 Mounting stay 15 Slider 30 Rail-based aerial work platform 34a, 34b Base end boom 34c Tip boom 36 Iron wheel R Railway rail T Trolley wire

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masakazu Yawa, 1152 Yamashita, Ryoke, Ryoji, Ageo City, Saitama Prefecture Inside the Ageo Plant of Aichi Vehicle Co., Ltd. No. 10 Aichi Vehicle Co., Ltd. Ageo Factory (72) Inventor Masaru Nishiwaki 1-4-1 Meieki Station, Nakamura-ku, Nagoya-shi, Aichi Tokai Railway Company (72) Inventor Yoshio Narimiya Nakamura-ku, Nagoya-shi, Aichi No. 1-4, Meieki Station Tokai Passenger Railway Co., Ltd. (56) References Japanese Utility Model Showa 61-1889086 (JP, U) Japanese Utility Model Showa 60-103196 (JP, U) Japanese Utility Model Utility Model Hei 4-34298 (JP, U.S.A.) U) Jiko 57-48880 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. An insulating device which is provided on a vehicle body of a traveling vehicle so as to be capable of at least raising and lowering operation and is used for a telescopic boom capable of expanding and contracting operation, wherein the telescopic boom is attached to the vehicle body so as to be able to raise and lower. A steel base boom, a steel intermediate boom nested within the base boom and telescopic in the axial direction, and a steel intermediate boom nested within the intermediate boom and axially A base boom insulating cover attached to the base boom, covering an upper side surface and left and right side surfaces of the base boom. The base boom is attached to the intermediate boom so as to cover side surfaces and left and right side surfaces, and is extended and retracted with the base boom together with the intermediate boom. When the intermediate boom is in a fully contracted state, the base boom and the base boom An insulating device for a telescopic boom, comprising an insulating cover for an intermediate boom stored between the insulating cover for a telescopic boom.