JPH0520775Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is inserted into the box-shaped boom of a crane.
This invention relates to a storage device for a built-in jib that can be freely pulled out.

BACKGROUND ART As shown in FIG. 5, a jib 2 is inserted into a box-shaped boom 1 and can be freely pulled out. A known device is known in which the jib 2 is pushed into the boom 1 by winding the jib 2 around the jib 2, bringing the hook 5 into contact with the tip end surface 2a of the jib 2, and pulling the cable 4.

Problems to be Solved by the Invention With such a device, at least the tip end surface 2a that the hook 5 comes into contact with protrudes from the boom 1, which increases the overall length of the boom and makes the crane truck equipped with this crane narrow. It becomes a hindrance when entering the place.

Means and action for solving the problem A push-in aid is attached to the tip of the jib, both in a state where it protrudes from the tip and in a state where it does not protrude, and utilizes the tensile force of the cable being wound up with a winch. This allows the jib to be completely stored inside the boom.

Embodiment In the vehicle body 10, a box-shaped boom 11 is pivotally connected with a pin 12 and can swing vertically with a cylinder 13. This boom 11 has a first boom 15 in a base boom 14.
It is a telescopic boom in which the top boom 16 and the top boom 16 are slidably fitted in sequence, and the top boom 16
The jib 17 is inserted and removed freely,
A cable 19 is attached to a sheave 18 provided at the tip of the jib 17.
is wound around the hook 20, and this cable 19 is wound up by a winch provided on the vehicle body 10 and can be freely let out.

Furthermore, there is a main hook 2 at the tip of the top boom 16.
A sheave 2 around which a main rope 22 with a
3 is provided, and this main rope 22 is wound up and let out by a winch (not shown) provided on the vehicle body 10.

The jib 17 is located at the tip end surface 24a of the box-shaped main body 24.
A pair of vertical plates 25, 25 are fixed at intervals,
A sheave 18 is rotatably provided between the pair of vertical plates 25, 25, and a pair of upper and lower mounting holes 26 are formed in the pair of vertical plates 25 to face each other. 26, a pushing aid, for example, a pair of rods 27 bent into a substantially U-shape,
The rods 27 of a storage link 29, in which the rods 27 are connected by a horizontal rod 28, are removably fitted. Reference numeral 30 denotes a locking pin hole, which is opposed to a locking pin hole 31 formed in the top boom 16, so that when the jib 17 is retracted, a locking pin is inserted into both locking pin holes 30, 31 to hold it. Note that when the jib 17 is pulled out, it is locked in the same manner.

Therefore, when storing the jib 17, the storage link 29 is fitted into the mounting hole 26 and attached, and the cable 19
is located outside the horizontal rod 28. In this state, by pulling the cable 19, the hook 20 is moved to the storage link 29.
The jib 17 can be pushed into the top boom 16 through the storage link 29 by contacting the inclined bottom surface 29a of the top boom 16, and since the jib 17 is pushed through the storage link 29, the jib 17 can be completely pushed until it is substantially flush with the top surface of the top boom 16. It can be pushed in and stored. Then, the storage link 29 is removed and stored at an arbitrary location.

The shape of the storage link 29 may be as shown in FIG. 4, or it can be pushed into the mounting hole 26 and stored, and when the jib 17 is stored, it can be pulled out and locked with a pin or the like. Also good.

Effects of the invention The jib 17 can be completely stored inside the boom by using the tensile force of the cable 19 wound up by the winch.
Since the jib 17 does not protrude beyond the tip of the boom, the overall length of the boom can be shortened, and the jib 17 can be stored without creating an impact force inside the boom, preventing deformation of the jib or boom.Furthermore, fine adjustments such as final positioning can be made. I can do it.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention.
Figure 2 is a front view and plan view of the main parts, Figure 3 is an overall view of the crane truck, Figure 4 is an explanatory diagram showing another example of a storage link, and Figure 5 is an explanatory diagram of a conventional example. be. 17 is the jib, 19 is the rope.

Claims (1)

[Scope of utility model registration request] A push-in aid is provided at the tip of the jib 17 that can be inserted into and pulled out from a box-shaped boom, and can be attached to the jib in a state where it projects from the jib tip and a state where it does not protrude from the jib tip. A built-in jib storage device characterized in that the jib 17 can be pushed into the boom and stored by engaging the cable 19 that is wound up and let out with a pushing aid.