JPS6354108B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-stage guard support device for a pole-erecting vehicle or the like.

In general, for pole-erecting vehicles equipped with a drilling device,
The multi-stage boom consists of a base boom, an intermediate boom, and a tip boom to expand the scope of crane work. Recently, in order to expand the working range of drilling work in accordance with the expansion of the working range of cranes, the above-mentioned drilling device has been improved by immersing the intermediate boom into the base boom when the multi-stage boom is fully retracted. The applicant has proposed a device that can be selectively fixed to the distal end boom and the proximal end boom.

On the other hand, during crane work, in order to prevent the hook suspension wire from coming into contact with electric wires or the like, it is necessary to control the expansion and contraction of the multistage guard in conjunction with the expansion and contraction of the multistage boom.

However, as mentioned above, when the multi-stage boom is fully retracted, the intermediate boom is completely retracted into the base end boom, so it is not possible to support each boom of the multi-stage boom in one-to-one correspondence with each guard of the multi-stage guard. It was impossible.

The present invention has been made in view of the above points, and by selectively fixing the drill support frame to the base boom or the tip boom, the intermediate boom is retracted into the base boom when the multi-stage boom is fully retracted. To provide a multi-stage guard support device for a pole erecting vehicle, etc., which can connect the intermediate boom in response to the recessed intermediate boom even in the case of a pole erecting vehicle.

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a base boom, inside the boom 1 is an intermediate boom 2, and inside this intermediate boom 2 is a distal boom 3. The booms are movably inserted and inserted to form a multistage boom, and are expanded and contracted by an appropriate drive device disposed between each boom.

By the way, a drilling device 5 is selectively fixedly provided at each tip of the base boom 1 or the tip boom 3 described above via a drill support frame 4.

This drill support frame 4 is formed in a U-shape, and is suspended from a bracket 6 fixed to the side of the tip end of the tip boom 3, and at the same time, the bracket 6 is held between both sides to prevent twisting or pulling out during drilling work. It supports power. Therefore, the drill support frame 4
There is no ceiling wall, and a space S is formed.

On the other hand, a winch device (not shown) is installed on the upper surface of the base of the base boom 1, and a base guard 7 is installed between the winch device and the tip of the base boom 1. On the other hand, the tip of a telescopic intermediate guard 8 is connected to the tip of the intermediate boom 2 through the above-mentioned space S, and the tip of a telescopic tip guard 9 is connected to the tip of the tip boom 3 with respect to the intermediate guard 8. , the proximal guard 7, the intermediate guard 8, and the distal guard 9 constitute a multistage guard.

Therefore, when the booms 1, 2 and 3 of the multi-stage boom start to extend and retract simultaneously or sequentially, the guards 7, 8 and 9 of the multi-stage guard correspond to each boom of the multi-stage boom, respectively. Since the booms are connected together, each guard connected to each boom can follow the expansion and contraction operations simultaneously or sequentially.

Furthermore, since the tip of each guard is connected to each boom, it can also be used as a ladder by installing steps on each guard.

As described above, according to the present invention, by suspending and supporting the drill support frame on the bracket fixed to the side of the tip end of the tip boom, a space is formed above the bracket, and the intermediate boom and the intermediate guard are connected through this space. Therefore, each boom of the multi-stage boom and each guard of the multi-stage guard can be made to correspond one-to-one. As a result, it is possible to extend and retract the multi-stage guard by following the telescoping action of the multi-stage boom without requiring a complicated mechanism for telescoping and retracting the multi-stage guard.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the invention.
The figure is a side view of the pole-erecting vehicle when the multi-stage boom is extended, Figure 2 is a partially enlarged view when the multi-stage boom is retracted, and Figure 3 is the side view of the pole-erecting vehicle when the multi-stage boom is extended.
It is a sectional view taken along the - direction in the figure. 1... Proximal boom, 2... Intermediate boom, 3...
Tip boom, 4...Drill support frame, 6...Bracket, 7...Proximal guard, 8...Intermediate guard, 9
...Tip guard, S...space.

Claims (1)

[Claims] 1. A multi-stage boom is formed by telescopically fitting one or more intermediate booms and a tip boom into the base boom in order, and a drill support frame can be selectively connected to the base boom or the tip boom. In the constructed pole-erecting vehicle, etc., a bracket is fixed to the side of the distal end of the tip boom, and a drill support frame is suspended and supported by the bracket to form a space above the bracket, while a space corresponding to the proximal boom is formed. and connect the proximal guard to the intermediate boom through the space, and further connect the tip guard to the tip boom through the space, so that the multistage guard can be expanded and contracted in conjunction with the expansion and contraction operation of the multistage boom. A multi-stage guard support device for pole-erecting vehicles, etc., which is characterized by: