JPH07237887A - Jib type crane - Google Patents

Abstract

PURPOSE:To provide a jib type crane, which can perform the changeover between the working posture and the transporting posture with less labor in a shorter time than with a conventional one. CONSTITUTION:A post 6, which is elevatably provided on a turn table 4 on a truck 2, and a boom 9, which is elevatably supported by the post 6, are provided so that they can be folded in the direction at a right angle to the boom elevating direction in the wiring condition with hinges 15, 16 used, and a wedge- like metal fitting as a bolt hole automatic positioning device for bolt fastening at the time of extending a boom is provided in a joint part of each of boom parts 9a-9d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile jib-type lifting machine (crane) applied to, for example, construction of a vertical circulation type multi-storey parking lot in a narrow space.

[0002]

2. Description of the Related Art Generally, a jib-type crane, which is used at a fixed position at a construction site of this kind, disassembles and removes a boom, a wire rope, etc., when carrying it to an installation site. It is assembled and used with other heavy equipment.

Therefore, there has been a problem that disassembling and assembling the crane requires a great deal of labor and time.

Therefore, in recent years, Japanese Patent Laid-Open No. 55-4446.
In No. 0, etc., when a boom divided into two parts is used, it is connected with a pair of left and right connecting pins, and when not in use, one of the connecting pins can be used as a hinge point to fold the upper boom to one side of the lower boom. A mobile crane has been proposed which is configured so that it can be switched between a work posture and a transportation posture with a minimum of labor and time.

[0005]

However, in the above-mentioned conventional mobile crane, since the upper boom is folded while the tip of the lower boom is supported by the pendant rope, it is necessary to change the rope. Since the workability is poor and the booms are simply connected by a pair of left and right connecting pins, a twisting deformation occurs when the upper boom is rotated with one of the connecting pins as a fulcrum,
There is a problem that folding of a plurality of booms has a limit because a large amount of labor is required for alignment and the like.

The present invention solves such a problem, and an object of the present invention is to provide a jib-type lifting machine capable of switching between a working posture and a transporting posture with less labor and time.

[0007]

A jib-type lifting machine according to the present invention for achieving the above object comprises a post erected on a base and a boom supported by the post. , Using a hinge and provided so as to be foldable in a direction perpendicular to the undulating direction while being wired, and an automatic bolt hole aligning device for connecting bolts at the time of extension is provided at a joint portion of each boom. It is a thing.

[0008]

According to the above construction, the post and the boom can be easily housed and deployed by hand while the wiring is being performed.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a front view of a jib-type lifting machine according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a perspective view of a housed state, and FIG. 4 is a perspective view of a hinge portion. .

As shown in the drawing, on a carriage 2 having lock devices 1 which can be locked to rails (not shown) at the four corners,
A revolving table 4 is provided so as to be revolvable by a revolving motor 3, and a post 6 is provided on the revolving table 4 such that the post 6 can be erected by a power cylinder 5.

A boom 9 is provided on the post 6 so that it can be hoisted by a hoisting wire rope 7 and a hoisting winch 8 wound around the tip of the post 6. The boom 9 is provided with a hook 12 that can be taken in and out by a hoisting wire rope 10 and a hoisting winch 11 which are wound around the tip of the boom 9.

A control board 1 is mounted on the turning table 4.
3 is provided, and an operation pendant is led out from the control panel 13.

The post 6 is a fixed post 6a.
The movable post that undulates is divided into two parts, and the movable post 6c at the tip can be folded to one side of the intermediate movable post 6b by the hinge 15.

When the movable post 6c is expanded with respect to the movable post 6b, the posts on the opposite side of the hinge 15 are connected by a bolt (not shown).

The boom 9 is divided into four parts by three hinges 16 provided alternately on the side of the boom, and the boom parts 9a to 9d can be alternately folded to one side of the boom 9 when the boom is stored. ing.

On the other hand, when the boom is deployed, as shown in FIG. 4, the boom portions 9a to 9b are located on the opposite side of the hinge 16.
The joint flange portions 17 provided on 9d are connected by bolts 18.

As a device for automatically aligning the bolt holes 17a at this time, wedge-shaped metal fittings 19a,
19b is attached opposite to the joint surface of each boom part 9a-9d.

That is, when the boom is unfolded, the inclined surfaces of the opposed wedge-shaped metal fittings 19a and 19b are relatively raised, so that the positional deviation of the bolt hole 17a due to the twist of its own weight is automatically corrected.

With this configuration, when the jib-type hoist is in the transporting posture, the post 6 and the boom 9 can be folded in a multiple manner. Therefore, as shown in FIG. Become.

This folding work is a simple work of removing the bolts 18, and can be quickly performed manually. Further, since it is folded horizontally on the turning table 4, the undulating wire rope 7 and the hoisting wire rope 10 can be re-assembled without refilling.
Can be folded while wiring.

On the other hand, when the boom is deployed, as described above, the wedge-shaped metal fittings 19a and 19b automatically correct the positional deviation of the bolt hole 17a, so that the bolt 18 can be easily fastened.

Further, since the jib-type lifting machine of this embodiment can be fixed to the H steel or the like at the installation location by the lock device 1, the counterweight or the like found in a normal jib-type lifting machine is unnecessary.

The present invention is not limited to the above embodiment,
It goes without saying that various changes such as the number of boom portions to be folded and the structure of the bolt hole automatic positioning device can be made.

[0025]

As described above in detail with reference to the embodiments, according to the jib-type lifting machine of the present invention, it is possible to easily store and deploy the post and the boom with human power while the wires are wired. The posture can be switched with less labor and time.

[Brief description of drawings]

FIG. 1 is a front view of a jib-type lifting machine according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a perspective view of the same storage state.

FIG. 4 is a perspective view of the hinge portion.

[Explanation of symbols]

 2 dolly 4 swivel table 6 post 7 undulating wire rope 9 boom 10 hoisting wire rope 16 hinges 18 bolts 19a, 19b wedge-shaped metal fittings

Claims (1)

[Claims] 1. A post erected upright on a base and a boom supported upright on the post are provided so as to be foldable in a direction perpendicular to the undulating direction while using a hinge and wiring. A jib-type lifting machine, characterized in that a bolt hole automatic alignment device for connecting bolts at the time of extension is provided at the boom joint.