JPH0138141Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a device for extending and storing an auxiliary jib.

That is, the present invention relates to a device for detaching an auxiliary jib from a jib mount bracket and storing the auxiliary jib in a jib mount bracket when the boom is horizontally held or swung out from the side.

[Conventional technology and its issues]

Previously, the process of mounting the auxiliary jib onto the jib mount bracket on the boom side had to be done manually.

[Problem that the invention attempts to solve]

However, since the auxiliary jib is generally tilted with respect to the boom, a force is exerted on the auxiliary jib that tends to open outward from the boom due to its own weight. Therefore, when manually mounting the auxiliary jib on the jib mount bracket of the boom, a considerable amount of operating force is required.

The present invention was developed in view of the above circumstances, and its purpose is to automatically place and remove the auxiliary jib on the jib mount bracket, thereby reducing the operating force. The object of the present invention is to provide an auxiliary jib extension and storage device that enables the following.

[Means and actions to solve the problem]

In order to achieve the above object, the present invention provides support brackets 8 and 9 on the left and right sides of the tip of the top boom 5 of the multistage boom 1, and supports one of the mounting legs 11 at the base end of the auxiliary jib 10 with the support brackets 8 and 9. In the boom device, the multi-stage boom is rotatably connected in the left and right direction by a shaft pin 12, and the other of the mounting legs 11 at the base end of the auxiliary jib 10 is removably connected to the other support bracket 9 by a shaft pin. A jib mount bracket 21 is provided at the intermediate part of the boom 2 on the base end side of the boom 1 so as to protrude toward the auxiliary jib 10 side during storage.
A bracket 25 is provided at the tip of the boom 2 so as to protrude toward the auxiliary jib 10 side during storage, and a storage roller 26 is pivotally supported on the bracket 25 with its axis directed in the vertical direction. A storage bracket 28 is provided to protrude downward from the auxiliary jib 10, and the auxiliary jib 10 is substantially parallel to the axis of the auxiliary jib 10, with both end portions bent toward the multi-stage boom 1 side, when the multi-stage boom 1 is extended. A storage guide 27 is provided in contact with the storage roller 26 to move the auxiliary jib 10 toward the multi-stage boom 1 and position the storage bracket 28 on the jib mount bracket 21.

Then, the multistage boom 1 is extended and the storage roller 2 is
6 and the storage guide 27, move the auxiliary jib 10 to the side of the multi-stage boom 1, and position the storage bracket 28 to a position where it is placed on the jib mount bracket 21.
By retracting the multistage boom 1, the storage bracket 28 is placed on the jib mount bracket 21.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 is a multi-stage boom, and the multi-stage boom 1 is a first,
It is composed of second, third, and fourth booms 2, 3, 4, and 5.

Mounting brackets 6, 7 are attached to the first and third booms 2, 4, and support brackets 8, 9 are attached to the left and right sides of the tip of the fourth boom 5.

10 is an auxiliary jib, and one base end 11 of the auxiliary jib 10 is attached to one support bracket 8 with a shaft pin 1.
2, it is rotatably connected in the left and right direction. A lock plate portion B of the auxiliary jib temporary fixing mechanism A is attached to one base end of the auxiliary jib 10. This lock plate section B consists of two plates 13 and 13 attached to one base end of the auxiliary jib 10,
14, a round hole 15 is formed in the plate 13, and a long hole 16 is formed in the plate 14 so as to overlap the round hole 15, and the long hole 16 is aligned with the axis of the auxiliary jib 10. It is elongated almost at right angles.

A stopper mechanism 17 is attached to the fourth boom (top boom) 5 and constitutes an auxiliary jib temporary fixing mechanism A together with a lock plate portion B. The stopper mechanism 17 includes a spring cylinder 18 fixed to the boom 5.
A pin 19 is provided on the spring cylinder 18 so as to be able to protrude by a predetermined amount, and the pin 19 is urged upward by a spring 20 provided within the spring cylinder 18. A rod 30 is attached to the lower end of the pin 19, passing through the bottom of the spring cylinder 18, and a knob 31 is attached to the rod 30.

A jib mount bracket 21 is provided at the lower left side of the intermediate portion of the first boom 2.

The first boom 2 has overhanging links 22, 23,
24 are stored. A storage roller 26 is attached to the left side of the tip of the first boom 2 via a bracket 25, and the axis of the storage roller 26 is directed in the vertical direction. The auxiliary jib 10
A storage guide 27 is provided along the axial direction of the auxiliary jib 10 at the lower right side of the middle portion of the auxiliary jib 10, and both end portions of the storage guide 27 are bent outward.

Further, a storage bracket 28 is provided downwardly projecting from the lower right side of the intermediate portion of the auxiliary jib 10.

Next, the operation will be explained.

The auxiliary jib 10 has a shaft pin 12 and a stopper mechanism 1.
The state shown in Fig. 7 is maintained by the pin 19 of No. 7 inserted into the elongated hole 16 (the auxiliary jib 10 is slightly lowered than the jib mount bracket 21 due to play with the pin hole, deflection, etc.). A large operating force is required to place the dovetail auxiliary jib 10 on the jib mount bracket 21).

When the multi-stage boom 1 is extended and operated, the storage guide 27
The auxiliary jib 10 follows the storage roller 26.
is closest to the multi-stage boom 1 side, and the pin 19 is inserted into the round hole 1 at the position where the auxiliary jib 10 is closest to the multi-stage boom 1.
5, and this auxiliary jib 10 is temporarily fixed to the fourth boom 5 (see FIGS. 4 and 8).

By retracting the multistage boom 1 from this state, the storage bracket 28 of the auxiliary jib 10 is placed on the jib mount bracket 21 (see FIG. 2). In this state, the storage bracket 28 is connected to the jib mount bracket 21 with the jib storage pin 29.

The operation of extending the auxiliary jib 10 is performed by reversing the above operation.

In this case, in order to release the temporary fixation of the auxiliary jib 10 to the fourth boom 5, the knob 31 is pulled downward by hand to remove the pin 19 from the round hole 15 and the elongated hole 16.

[Effect of idea]

As detailed above, the present invention has a multi-stage boom 1
Support brackets 8 and 9 are provided on the left and right sides of the tip of the top boom 5, and one of the mounting legs 11 at the base end of the auxiliary jib 10 is connected to the support bracket 8 by a shaft pin 12 so as to be rotatable in the left and right direction. Jib 10
In a boom device in which the other of the mounting legs 11 at the base end of the multi-stage boom 1 is removably connected to the other support bracket 9 with a shaft pin, an auxiliary device for storage is provided at the intermediate portion of the boom 2 on the base end side of the multi-stage boom 1. A jib mount bracket 21 is provided to protrude toward the jib 10 side, and a bracket 25 is provided at the tip of the boom 2 to protrude toward the auxiliary jib 10 side during storage. A storage bracket 28 is provided in the intermediate part of the auxiliary jib 10 so as to project downward, and the auxiliary jib 10 is substantially parallel to the axis of the auxiliary jib 10 with both end portions facing the multi-stage boom 1 side. When the multistage boom 1 is extended, the storage roller 2 is bent toward the
6, the storage guide 2 moves the auxiliary jib 10 to the multi-stage boom 1 side and positions the storage bracket 28 to be placed on the jib mount bracket 21.
This is an auxiliary jib extension and storage device characterized by being provided with a.

Therefore, the multi-stage boom 1 is extended, the storage guide 27 is brought into contact with the storage roller 26, the auxiliary jib 10 is brought to the multi-stage boom 1 side, the storage bracket 28 is positioned to be placed on the jib mount bracket 21, and the multi-stage boom 1 is moved. By collapsing, the storage bracket 28 can be placed on the jib mount bracket 21.

Therefore, the auxiliary jib 10 can be automatically placed on or removed from the jib mount bracket 21, and the operating force can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a multistage boom equipped with an auxiliary jib extension and storage device according to the present invention, FIG. 2 is a view taken from the direction of FIG. 1, and FIG. 3 is a perspective view of the auxiliary jib temporary fixing mechanism. Fig. 4 is a side view of the same, Fig. 5 is a plan view of the same, Fig. 6 is a vertical sectional view of the stopper mechanism, Figs. It is an arrow view from the X direction. 1 is a multistage boom, 5 is a top boom, 10 is an auxiliary jib, 26 is a storage roller, 27 is a storage guide,
28 is a storage bracket.

Claims (1)

[Scope of utility model registration request] Support brackets 8 and 9 are provided on the left and right sides of the tip of the top boom 5 of the multi-stage boom 1, and one of the mounting legs 11 at the base end of the auxiliary jib 10 is attached to the support bracket 8.
In the boom device, the multi-stage boom is connected rotatably in the left and right direction by a shaft pin 12, and the other of the mounting legs 11 at the base end of the auxiliary jib 10 is removably connected to the other support bracket 9 by a shaft pin. 1
A jib mount bracket 2 is attached to the intermediate part of the boom 2 on the base end side of the
1, and a bracket 25 is provided at the tip of the boom 2 to protrude toward the auxiliary jib 10 side during storage, and a storage roller 26 is supported on the bracket 25 with its axis directed in the vertical direction. A storage bracket 28 is provided in the middle part of the jib 10 to protrude downward, and the auxiliary jib 10 is substantially parallel to the axis of the auxiliary jib 10, with both end portions bent toward the multi-stage boom 1 side. The auxiliary jib is characterized by being provided with a storage guide 27 that contacts the storage roller 26 to move the auxiliary jib 10 toward the multi-stage boom 1 side and position the storage bracket 28 on the jib mount bracket 21 when the jib mount bracket 21 is extended. Overhang storage device.