JPS6361277B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work box balancing device provided at the tip of a telescoping boom of an aerial work vehicle, and particularly relates to a balancing device for a work box in which the telescoping boom is a three-stage simultaneous telescoping boom. .

In the three-stage boom, one cylinder device and
The technical concept of simultaneously extending and retracting this three-stage boom by means of a pulley device and a cable looped around the pulley device is well known. Various arrangements have also been proposed.

In the present invention, a pulley device is provided within the boom as a balancing device for the work box, as will be described later.In order to share a part of the mechanism of this pulley device with the above-mentioned pulley device for simultaneous extension and contraction of the boom, The telescopic boom was constructed as follows.

In the figure, 1 is a three-stage boom that is slidably fitted in sequence with a base end boom 2, an intermediate boom 3, and a tip boom 4, and a hoisting cylinder device is mounted on a mount 5 that is rotatably installed on a vehicle (not shown) or the like. 6, it is pivoted so that it can be raised and lowered freely. Reference numeral 8 denotes a telescopic cylinder device provided between the base end boom 2 and the intermediate boom 3 to extend and retract the intermediate boom 3 with respect to the base end boom 2. Reference numeral 9 has a first pulley 11 and a second pulley 12 pivotably supported at both ends of a pulley connecting rod 10, respectively, and a first cable 17 is attached to these first pulley 11 and second pulley 12. It is an endless pulley device, one end of which is rotatably supported on a bracket 15 provided at the base of the intermediate boom 3, and the other end is connected to the tip boom 4 by a bracket 16.
It is configured to be supported on the lower inner upper surface of the. next,
A pivot support 19 is rotatably provided at a proper position of the first cable 17 and a bracket 18 provided on the base side of the proximal end boom 2.
The other end of the first connecting rod 20 is fastened 21, and a bracket 22 provided at the base of the tip boom 4 is attached.
The tip boom 4 and the first cable 17 are fastened 23 to a proper position via. Therefore, in the three-stage boom 1 configured in this way, when the intermediate boom 3 is extended and contracted from the base end boom 2 by the cylinder device 8,
At the same time, the tip boom 4 is extended and retracted from the intermediate boom 3 via the above-mentioned pulley device 9 by the same amount.

Next, the balance device of the work box of the present invention will be explained. The first and second pulleys 11 of the aforementioned pulley device 9,
A third pulley 24 and a fourth pulley 25, which are separate from the first pulley 11 and second pulley 12, are attached to the respective pulley shafts 13 and 14 of the 12 pulleys. Each can be mounted independently and rotated freely. And these pulleys 24 and the fourth pulley 25
A second cable 26 is hung endlessly around the frame, and the other end of the second connecting rod 28, one end of which is rotatably supported 27 on the pedestal 5, is fastened 29 to the appropriate position of the second cable 26. do. On the other hand, a work box 30 is rotatably supported 31 at the tip of the tip boom 4, and the work box 30 is
The third connecting rod 33 has one end rotatably pivoted 32 at a suitable position, and the other end of the third connecting rod 33 is fixed 24 at a suitable position of the second cable 26.

The balance device configured in this way is such that when the boom expands and contracts (see Figure 1), the tip boom 4 also expands and contracts in the same direction and by the same amount at the same time as the intermediate boom 3 expands and contracts. The respective fastening parts 2 of the second connecting rod 28 and the third connecting rod 33 that are fastened
9 and 34 are also moved by the same amount, so the pivot angle of the work box 30 remains unchanged and remains horizontal.

Next, explaining the case of raising and lowering the boom, when the boom is raised from the state shown in FIG. 1 to the state shown in FIG. Attachment point 2 with article 26
9 moves to the left by that amount. Then, the anchoring point 34 of the third connecting rod 33 that is anchored to the same second cable 26 moves to the right, and the work box 30 is tilted down by the amount that the boom is raised, and the work box 30 remains in a horizontal state. It turns out. The opposite is true when the boom is laid down.

In addition, in the present invention, the electric wiring or hydraulic piping 36 connecting the control device (not shown) of this boom device on the gantry 5 side and the control device 35 on the work box 30 side is replaced with a part of the above-mentioned balance device. It is configured to be attached to the second connecting rod 28, second cable 26, and third connecting rod 33, which eliminates the need for a cord reel, a hose reel, etc.

In addition, 37, 38, and 39 are ladders provided on the proximal boom, intermediate boom, and tip boom, respectively.
This is used to get on and off the work box 30.

As described above, the present invention integrates the work box balancing device and the pulley device of the boom simultaneous extension and contraction mechanism within the boom, making the entire device compact and reducing the overall weight of the boom device. In addition, all the cables are inside the boom, so there is no chance of them breaking due to accidents such as contact with external objects, so safety is also taken into consideration.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing the configuration of the present invention;
FIG. 2 is also an explanatory diagram of the operation. 1...3-stage boom, 2...base end boom, 3...
Intermediate boom, 4... Tip boom, 5... Frame, 6
... Lifting cylinder device, 8 ... Telescopic cylinder device, 9 ... Pulley device, 10 ... Pulley connecting rod, 11
...First pulley, 12...Second pulley, 17...First pulley
Cable, 20...first connecting rod, 24...third pulley,
25... Fourth pulley, 26... Second rope, 28...
Second connecting rod, 30... work box, 33... third connecting rod.

Claims (1)

[Claims] 1 The intermediate boom 3 and the tip boom 4 are slidably fitted in order into the base end boom 2 which is pivotally supported to the base 5 so that it can be raised and lowered to form the three-stage boom 1, and the intermediate boom is attached to the base end boom 2. A telescopic cylinder device 8 that extends and retracts the boom 3 is disposed between these booms,
A pulley connecting rod 10 having a first pulley 11 and a second pulley 12 at both ends is attached to the base of the intermediate boom 2 via a bracket, and a first cable 17 is attached to these first and second pulleys 11 and 12. Wrap around endlessly,
The proper position of this first cable 17 and the base of the proximal end boom 2 are connected by a first connecting rod 20, and this first cable 17 is
7 and the base of the distal end boom 4 are fixed, and when the intermediate boom 3 is extended and contracted with respect to the base end boom 2 by the telescopic cylinder device 8, the distal end boom 4 is attached to the intermediate boom 3 with respect to the intermediate boom 3. In the aerial work vehicle equipped with a three-stage simultaneous telescopic boom configured to expand and contract by the same amount at the same time as the first pulley 1
1 and a third pulley 24 coaxially with the second pulley 12.
A fourth pulley 25 is provided coaxially with the third and fourth pulleys 24 and 25, and a second cable 26 is endlessly wound around the third and fourth pulleys 24 and 25, so that the second cable 26 is connected to the appropriate position of the mount 5. The work box 30 is rotatably supported on the tip boom 4, and the work box 30 is connected to the right place of the work box 30 with the second connecting rod 28.
A balancing device for a work box in an aerial work vehicle, in which a cable 26 and a proper position are connected by a third connecting rod 33.