JP2541692Y2 - Oil and power transmission equipment for 5-stage telescopic boom - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage telescopic boom, and more particularly to a five-stage telescopic boom oil and power transmission device for arranging a hydraulic hose, an electric / optical cable, etc. in a five-stage telescopic boom.

[0002]

2. Description of the Related Art For example, an aerial work vehicle is provided with a multistage telescopic boom configured to be telescopically extendable and telescopic, and a worktable for an operator to board is provided at the tip of the multistage telescopic boom. It is attached. Inside the multi-stage telescopic boom, there are a telescopic cylinder and a wire mechanism for performing the telescopic operation of the multi-stage telescopic boom, a hose for sending hydraulic pressure from the vehicle body (base) side to the work table side, and a hose connected to the vehicle body side. A cable for transmitting an electric signal or an optical signal to and from the worktable is provided. In addition, a reel device was attached to the vehicle body, and the hose and the cable were drawn out or wound up from the reel device in accordance with expansion and contraction of the multistage telescopic boom.

[0003]

However, among the multi-stage telescopic booms, for example, a five-stage multi-stage telescopic boom (five-stage telescopic boom) used for increasing the height of a workbench is in a fully extended state. The corresponding hoses and cables are also considerably longer. For this reason, there has been a problem that when the five-stage telescopic boom is fully contracted, the reel device that winds most of those hoses and cables becomes large.

[0004] The present invention has been made in view of such a problem, and has been made so that a hose or a cable can be extended or contracted in accordance with expansion and contraction of a five-stage telescopic boom without using a reel device. It is an object of the present invention to provide a five-stage telescopic boom oil and power transmission device.

[0005] However, the five-stage telescopic boom referred to here includes a first boom attached to a base, a second boom inserted into the first boom so as to be extendable and retractable, and a telescopic boom inside the second boom. , A fourth boom telescopically inserted into the third boom, and a fifth boom telescopically inserted into the fourth boom. Things. Further, a piston rod of a telescopic cylinder for extending and contracting the fourth and fifth booms with respect to the third boom is attached to a base end of the third boom, and a cylinder tube of the telescopic cylinder is connected to a base end of the fourth boom. It is attached to the part.

[0006]

In order to achieve the above object, in the oil transmission / power transmission device of the present invention, a first holding means for holding a cable or a hose is attached to a leading end of a first boom, Third holding means for holding the cable or hose is attached to the base end of the third boom.
Fifth holding means for holding the cable or hose is also attached to the base end of the boom. Further, a second sheave for looping a portion of the cable or hose between the holding portion by the first holding means and the holding portion by the third holding means is attached to the base end of the second boom,
At the bottom end of the cylinder tube of the telescopic cylinder, a fourth sheave for looping a portion of the cable or hose between the holding portion by the third holding means and the holding portion by the fifth holding means is attached.

[0007]

In such an oil transmission / power transmission device, a portion between the holding portion of the hose or the cable by the first holding device and the holding portion of the third holding device, and the holding portion by the third holding device and the holding by the fifth holding device. The portions between the parts are respectively extended or stored according to the expansion and contraction of the second and third booms with respect to the first boom and the expansion and contraction of the fourth and fifth booms with respect to the third boom. Therefore, the length of the hose or cable corresponding to the extended state of the five-stage telescopic boom can be obtained without using a reel device. Furthermore, the hose or the cable can be extended and stored smoothly by being wound around the second and fourth sheaves and giving an appropriate tension to the hose or cable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, FIG. 2 shows a five-stage telescopic boom 20 provided with the oil transmission / power transmission device according to the present invention. The five-stage telescopic boom 20 is provided with a swivel base 32 provided on a vehicle body (base) 31 of an aerial work vehicle 30 so as to be horizontally swivelable.
Attached to the top of the More specifically, the first boom 21 pivotally attached to the upper part of the swivel table 32 so as to be able to move up and down.
And the second telescopically inserted into the first boom 21
A boom 22, a third boom 23 telescopically inserted into the second boom 22, a fourth boom 24 telescopically inserted into the third boom 23, and a fourth boom 2
The fourth boom 25 is telescopically inserted into and extends from the fifth boom 25.

A work table 35 is attached to a tip end of the fifth boom 25. An operator on the work table 35 can turn the turntable 32, raise and lower the 5-step telescopic boom 20, and extend and retract the boom 20. Through to any altitude.

The extension and retraction of the second boom 22 and the third boom 23 with respect to the first boom 21, as shown in FIG.
This is performed by the telescopic cylinder 26 and the first wire mechanism 27. The end of the piston rod 26a of the first telescopic cylinder 26 is attached to the base end of the first boom 21, and the rod-side end of the cylinder tube 26b is attached to the base end of the second boom 22. Therefore, when the first telescopic cylinder 26 expands and contracts, the second boom 22 expands and contracts with respect to the first boom 21.

The first wire mechanism 27 includes a first telescopic sheave 27a rotatably attached to the bottom end of the first telescopic cylinder 26, and a first telescopic sheave 27a.
a around the wire 27b.
One end of the wire 27 b is attached to the base end of the first boom 21, and the other end is attached to the base end of the third boom 23. Therefore, the first telescopic sheave 27a moves in the extension direction of the five-stage telescopic boom 20 (hereinafter, this direction is simply referred to as the extension direction) with the extension operation of the first telescopic cylinder 26. Is pulled up by the wire 27b and the first boom 21 and the second boom 22
To extend. Although not shown, the third boom 23 can be reduced and moved by a similar wire mechanism.

On the other hand, the extension and retraction operation of the fourth boom 24 and the fifth boom 25 with respect to the third boom 23 is performed by a second extension cylinder 28 built in the booms 23, 24 and 25.
(Corresponding to the “telescopic cylinder” in the claims) and the second wire mechanism 29. 2nd telescopic cylinder 2
The end of the eighth piston rod 28a is attached to the base end of the third boom 23, and the end of the cylinder tube 28b on the rod side is attached to the base end of the fourth boom 24. For this reason, when the second telescopic cylinder 28 expands and contracts (operates in conjunction with the first telescopic cylinder 26), the fourth boom 24 expands and contracts with respect to the third boom 23.

The second wire mechanism 29 includes a second telescopic sheave 29a rotatably attached to the bottom end of the second telescopic cylinder 28, and a second telescopic sheave 29a.
a around the wire 29b.
One end of the wire 29b is attached to the base end of the third boom 23, and the other end is attached to the base end of the fifth boom 25. Therefore, when the second telescopic sheave 29a moves in the extending direction along with the extension operation of the second telescopic cylinder 28, the fifth boom 25 is pulled up by the wire 29b and is moved to the third boom 23 and the fourth boom 24. It extends and moves. Note that the fifth boom 25 can be reduced and moved by a similar wire mechanism (not shown).

Next, the oil transmission / power transmission device provided on the five-stage telescopic boom 20 configured as described above will be described with reference to FIG. The hose referred to here is the body 31
A hydraulic hose for supplying hydraulic pressure from the side to the worktable 35 side, and a cable is an electric cable or an optical fiber for transmitting an operation signal or other electric / optical signals between the vehicle body 31 side and the worktable 35 side. Cable.

The oil transmission / power transmission device 10 includes a first clamp (first holding means) 11 mounted on the upper end of the first boom 21 and a second clamp rotatably mounted on the base end of the second boom 22. It comprises two sheaves 12 and a pair of third clamps (third holding means) 13, 13 attached inside the base end of the third boom 23. Further, a fourth sheave 14 rotatably mounted in parallel with the second telescopic sheave 29a at the bottom end of the cylinder tube 28b of the second telescopic cylinder 28, and a fifth boom 2
A fifth clamp (fifth holding means) 15 attached to the base end of the fifth unit 5 is also provided.

A hose or a cable (hereinafter, referred to as a hose or the like H) disposed in the direction of extension from the vehicle body 31 side along the outer surface of the upper surface of the first boom 21 is first moved by the first clamp 11 to the tip of the first boom 21. While being held at the top,
It is inverted inside the upper surface of the first boom 21 and is disposed in the reduction direction of the five-stage telescopic boom 20 (hereinafter, this direction is simply referred to as the reduction direction). The hose H or the like is hung around the second sheave 12 by a half turn and disposed in the extension direction. One of the third clamps 13 is provided at an inner upper portion of the base end of the third boom 23 (the second telescopic cylinder 28). Above).
Further, the hose H or the like is bent into an S-shape, and is held by another third clamp 13 at the lower part inside the base end of the third boom 23 (below the second telescopic cylinder 28).

A hose H or the like ahead of the third clamps 13, 13 is disposed in the third to fifth booms 23 to 25 along the lower surface of the second telescopic cylinder 28 in the extending direction, and is provided with a fourth sheave. 14 is arranged in the reduction direction along the upper surface of the second telescopic cylinder 28 while being wound around by half a turn. further,
The hose H, etc., ahead of it, is held above the base end of the fifth boom 25 by the fifth clamp 15, is inverted outwardly of the upper surface of the fifth boom 25, and extends along the outer surface of the upper surface of the fifth boom 25. It is arranged in the direction. Thus, the leading end of the hose H reaches the work table 35 as shown in FIG.

The oil transmission / power transmission device 10 configured as described above
Then, when the second boom 22 and the third boom 23 expand and contract with respect to the first boom 21, the first clamp 11
The hoses H and the like between the clamps 13 are extended in the extending direction or stored in the contracting direction while moving the portion around the second sheave 12.

When the fourth boom 24 and the fifth boom 25 expand and contract with respect to the third boom 23, the hose H between the third clamp 13 and the fifth clamp 15 is connected to the portion of the hose that extends around the fourth sheave 14. Are moved out and stored in the same manner as described above.

Therefore, even if a reel device for winding or unwinding a hose or the like H is not provided on the vehicle body 31, from the vehicle body 31 side to the work table 35 in response to the expansion / contraction operation of the entire 5-stage telescopic boom 20. The length of the hose H required for the above can be obtained. In addition, since the hose H and the like are maintained to a certain degree of tension by being wound around the second sheave 12 and the fourth sheave 14, they may hinder the operation of the telescopic cylinders 26 and 28 and the wire mechanisms 27 and 29. Never.

The above embodiment is directed to a five-stage telescopic boom mounted on an aerial work vehicle. The oil transmission / power transmission device according to the present invention is mounted on a work vehicle other than the aerial work vehicle. A five-stage telescopic boom can be used.

[0022]

[Effect of the Invention] As described above, in the oil transmission / power transmission device of the present invention, the hose or the cable is extended or stored inside the five-stage telescopic boom in response to the telescopic operation of the five-stage telescopic boom. be able to. Therefore, unlike the related art, the length of the hose or the like corresponding to the extension length of the five-stage telescopic boom can be obtained without providing a reel device or the like outside the five-stage telescopic boom.

In the five-stage telescopic boom, an appropriate tension can be given to the hose or the like by hanging the hose or the like around the sheave. Therefore, it is possible to prevent the hose or the like from sagging and hindering the operation of other devices (such as the telescopic cylinder) disposed in the five-stage telescopic boom.

[Brief description of the drawings]

FIG. 1 shows an oil transmission / power transmission device according to the present invention and its oil transmission / transmission device.
It is a side view of the 5-stage telescopic boom provided with the power transmission device.

FIG. 2 is a side view of an aerial work vehicle equipped with the five-stage telescopic boom.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Oil transmission / power transmission device 11 1st clamp 12 2nd sheave 13 3rd clamp 14 4th sheave 15 5th clamp 20 5 steps telescopic boom 21 1st boom 22 2nd boom 23 3rd boom 24 4th boom 25 5th Boom H hose or cable

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B66F 9/22 B66F 11/04 11/04 B66C 23/68 L

Claims (1)

(57) [Scope of request for utility model registration] A first boom attached to a base; a second boom inserted into the first boom so as to extend and contract;
A third boom telescopically inserted into the second boom, a fourth boom telescopically inserted into the third boom, and a fifth boom telescopically inserted into the fourth boom. And a piston rod of a telescopic cylinder for extending and contracting the fourth boom and the fifth boom with respect to the third boom is attached to a base end of the third boom. In a five-stage telescopic boom in which a cylinder tube is attached to a base end of the fourth boom, the transmission of the five-stage telescopic boom for arranging a hose or a cable from the base to the distal end of the fifth boom. An oil and power transmission device, wherein the first and second booms are attached to a distal end portion of the first boom and hold the cable or the hose, and are attached to a proximal end portion of the third boom. Third holding means for holding the cable or the hose, fifth holding means attached to the base end of the fifth boom for holding the cable or hose, and attachment to the base end of the second boom A second sheave for looping a portion of the cable or the hose between the holding part of the first holding means and the holding part of the third holding means, and a bottom end of the cylinder tube in the telescopic cylinder And a fourth sheave attached to the cable or the hose for looping a portion of the cable or the hose between the holding portion of the third holding means and the holding portion of the fifth holding means. Oil transmission and power transmission equipment for telescopic booms.