JP2584204Y2 - On-board crane rope support structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted crane that can be mounted on a carrier such as a light truck, and more particularly to a rope supporting structure.

[0002]

2. Description of the Related Art In general, for delivery of electric appliances and transportation of agricultural products, these products are carried on a carrier of a small truck (light truck). However, at present, the work of placing or unloading these loads on the truck bed is largely dependent on manual labor. Therefore, it is conceivable to use a crane for the above-mentioned luggage lifting and lowering work, but since a large crane used at a construction site or the like cannot be used, a small crane that can be mounted on a truck bed is being developed. is there.

[0003] By the way, an arm that can swing vertically or circumferentially is provided at the upper end of the column, and a hanging member provided at the tip of a rope (including a chain or a wire) is hung from the tip of this arm. In the crane, the base end of the rope is fixed to the middle part of the column and the distal end is supported by the end of the arm, so that the rope forms one side of a triangle. It is known that a displacement amount can be obtained and is effective for a lift.

[0004]

However, the above-described rope supporting structure of a crane is effective for lifting, but it is necessary to move a suspended object around a support column in order to move a suspended object. When rotated, the rope between the intermediate portion of the column and the tip of the arm may be caught by the already loaded luggage or the like, which may hinder the loading operation.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a vehicle- mounted crane according to the present invention has a vertical axis on a vehicle bed.
A support that is rotatably supported as a center, and on this support
Crane arm pivotally supported at the end in a vertical plane
And is provided between the crane arm and the column,
A cylinder unit that swings the crane arm in a vertical plane
Power unit and this crane arm
With a lifting member hanging from the tip of the
And the base end of the rope is fastened to the middle of the post,
The end of the rope is suspended from the arm tip
With pulleys, and assists near the base end of the crane arm
Swivel while supporting pulley from one side with auxiliary arm
The rope was mounted freely, and the intermediate part of the rope was supported by this auxiliary pulley.

[0006]

The intermediate portion of the rope between the base end fixed to the support and the arm tip is supported by the auxiliary pulley near the arm base end, so that the intermediate portion of the rope is rotated when the arm rotates. It is possible to prevent a situation where the baggage or the like already loaded is caught.
Also, by removing the rope from the auxiliary pulley,
Large lifting effect of the lifting part of the part can be obtained
You.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a state where a vehicle-mounted crane to which the rope supporting structure according to the present invention is applied is mounted on a light truck, and FIG. 2 is an overall view of the vehicle-mounted crane.

The on-board type crane mainly includes a column 1, a crane arm 2, a power unit 3 and a rope 4. The column 1 is formed of a square pipe, and the lower end thereof is perpendicular to a pedestal 6 detachably mounted on a loading platform with bolts 5. It is rotatably supported about a shaft, and the upper end is detachably supported using a bolt 9 on a bracket 8 provided on a torii 7 provided at the front of the loading platform.

The crane arm 2 is supported by a bracket 10 provided on the upper end of the column 1 via a shaft 11 so as to be swingable in a vertical plane, and a bracket 12 is provided at the tip thereof as shown in FIG. A pulley 13 is pivotally supported on the bracket 12, and a rope 4 having a base end fixed to a lower portion of the support column 1 is hung over the pulley 13 and hangs downward, and a hook 14 for hooking a load is attached to a lower end thereof.

Further, an auxiliary arm 16 is pivotally supported on a bracket 15 provided near the base end of the crane arm 2 by a shaft 17, and the auxiliary arm 16 has an auxiliary pulley 18.
Is rotatably mounted in a cantilever structure.
So that the middle part of the rope 4 can be stretched.

The power unit 3 includes a motor, a hydraulic pump driven by the motor, a cylinder unit for supplying and discharging hydraulic oil from the hydraulic pump, a sub-tank for compensating for a piston rod of the cylinder unit to enter and exit, and a hydraulic oil flow path. The switching valve mechanism is integrated, and the tip of the piston rod is connected to the bracket 1 provided on the bracket 20 provided at the base end of the cylinder unit at the middle of the column 1.
5 are rotatably connected to each other.

In the above description, when the load is to be placed on the carrier, the operator turns the crane arm 2 to the suspended position, and then drives the power unit 3 to cause the cylinder unit to perform a compression movement to move the crane arm 2 as shown in FIG. After the hook 14 at the tip of the rope 4 is hooked on the luggage, the power unit 3 is driven to extend the cylinder unit, and the crane arm 2 is moved as shown by the one-dot chain line in FIG. Raise and rotate to the mounting position.
Thus, the crane door driven by the power unit 3
The swing of the arm 2 in the vertical plane, that is, only the vertical movement,
Lift and suspend the luggage suspended on the
Combined with the rotation of the lane arm 2 in the horizontal plane, the loading platform
Load your luggage.

When the crane arm 2 is turned by suspending the load on the lower end hook 14 of the rope 4, the rope 4
Is supported by the auxiliary pulley 18 near the base end of the crane arm 2, so that the lifting effect of the hook 14 is reduced, but the rope 4 is not caught by the already loaded luggage or the like. , Does not hinder the work.

If there is no possibility that the rope 4 will be caught by the already loaded luggage or the like, the auxiliary pulley 1
Since the cable 8 is supported on the shaft 17 of the bracket 15 in a cantilever structure, the rope 4 can be detached from the auxiliary pulley 18. In this case, a large lifting effect of the hook 14 can be obtained.

[0015]

[Effects of the Invention] As described above, according to the present invention,
It is supported on the vehicle bed so that it can rotate about a vertical axis.
And a pivot at the upper end of the column so that it can swing in a vertical plane.
A crane arm to be supported, and the crane arm
The crane arm is interposed between the struts and swings in a vertical plane.
Power unit composed of moving cylinder unit
And a lifting part hanging from the tip of this crane arm
With a rope attached to the tip of the material.
The rope is fastened to the middle part of the support, and the end of this rope is
Supported by a pulley supported by a suspension
The auxiliary pulley near the base end of the
And swingably attached to the middle part of the rope.
Is supported by this auxiliary pulley, so that when the crane arm rotates, it is possible to prevent the middle portion of the rope from being caught by the already-stuffed luggage or the like, thereby improving workability.

Since the above-mentioned auxiliary pulley is supported by a cantilever structure , the rope is easily detached from the auxiliary pulley.
By using it without using the auxiliary pulley
A large head effect, and change the head effect
Simple task of removing the rope from the auxiliary pulley
Can be done with

[Brief description of the drawings]

FIG. 1 is a perspective view of a light truck equipped with a vehicle-mounted crane to which a rope support structure according to the present invention is applied.

FIG. 2 is an overall view of the on-board crane.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

[Explanation of symbols]

1 ... prop, 2 ... crane arm, 3 ... power unit,
4 ... rope, 6 ... pedestal, 7 ... torii, 13 ... pulley, 14
... hooks, 16 ... auxiliary arms, 18 ... auxiliary pulleys.

Claims (1)

(57) [Scope of request for utility model registration] A post to be 1. A rotatably supported about a vertical axis on the loading platform of the vehicle, and the crane arm that is swingably supported in a vertical plane to the upper end of the strut, the clay
Crane arm
Consists of a cylinder unit that swings in a vertical plane
It comprises a power unit, and a rope attached to the lifting member hanging from the tip of the crane arm tip, and fastening the base end portion of the rope in the middle section of the column, the low
Supporting the front end portion of the flop by the arm tip lowered axially supported by the pulleys suspended to the auxiliary pulley auxiliary A near proximal end of the crane arm
It mounted for swinging with supported from one side by chromatography arm, the intermediate portion of the front Symbol rope is supported by the auxiliary pulleys, rope supporting structure of the vehicle-mounted crane according to claim and this.