JPS6032075Y2 - Simple crane - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a simple crane.

The crane shown in FIG. 1 is a conventionally known simple crane, and this crane has a swing column 2 rotatably disposed on the vehicle immediately behind the driver's cab 1, and a pivot point mounted on the top of the swing column 2. It consists of a supported boom 3, a hoisting cylinder 4 for controlling the hoisting of the boom 3, a lifting hook 5 suspended from the tip of the boom 3, etc. In this case, the tip of the swing column 2 is lower than the roof of the driver's cab 1 so that the tip does not come into contact with obstacles during driving.

However, when it is formed so low as this, it is inconvenient when carrying out cargo handling work etc. in front of the driver's cab 1, and the cargo handling work cannot be carried out satisfactorily.

The invention of the present invention allows the swing support to be set at a low position to prevent collisions with obstacles while driving, and at the same time allows the swing support to be set at a high position during cargo handling operations. This allows cargo handling operations to proceed smoothly.

Next, the configuration of the present invention will be explained in detail based on one embodiment.

Reference numeral 6 denotes a guide tube disposed in the vehicle, which has openings at the top and bottom.

This guide tube 6 is supported by a loading platform B provided on the chassis frame A and a bracket C fixed to the chassis frame A.

Reference numeral 9 denotes a swing strut, 10 a boom pivotably supported at the upper end of the swing strut 9, and 11 a swing strut 9 and a boom 10.
This is a hoisting cylinder for hoisting and driving the boom 10 disposed between appropriate positions of the boom 10.

In this way, the boom 10 is attached to the distal end of the swing column 9 so that it can be driven up and down.

Reference numeral 7 denotes a fitting tube that is attached to the lower end of the pivoting column 9 and is slidably fitted into the guide tube.

A jacking device is arranged in the fitting tube 7 as follows.

That is, in this embodiment, the jacking device is composed of a compound hydraulic cylinder, and the cylinder portion is connected to the fitting tube 7.
A ground plate 8 is provided at the lower end of a piston rod 7' extending downward from the cylinder portion (fitting tube 7).

This jacking device does not have to have the structure of this embodiment, but may be one having a ground plate at its lower end and disposed in the fitting tube 7.

Note that the pivot support 9 and the fitting tube 7 are attached so as to be pivotable (the pivot drive mechanism is not shown).

When the vehicle is moving, the lower end of the swing support 9 is supported by the upper end of the guide tube 6, as shown in FIG. It is now located at a lower position.

Next, from the state shown in Fig. 2, the jacking device (composed of 7° 7' and 8) is driven to extend, and even after the ground plate 8 comes into contact with the ground, the jacking device (composed of 7, 7', and 8) is further extended.* ), the swing strut 9 rises to avoid interference between the boom 10 and the driver's cab 1 when the swing strut 9 is driven to swing, thereby facilitating cargo handling work in front of the driver's cab 1. In this state, the stopper 12 provided on the jacking device (composed of 7, 7' and 8) comes into contact with the lower end of the guide tube 6.

When the jacking device (consisting of 7, 7' and 8) is further extended from this state, the front part of the vehicle is lifted up via the stopper 12, and the front wheels are raised to obtain a working position.

In summary, the simple crane of the present invention consists of a guide tube that is vertically arranged in the vehicle behind the driver's cab and has an opening at the top and bottom, a swing column with a boom attached to its upper end so that it can be driven up and down, and a swing column. The jacking device includes a fitting tube attached to the lower end and slidably inserted into the guide tube, and a ground plate at the lower end, and the jacking device is arranged in the fitting tube. When moving, the swing support is contracted to be located at a low position, and during crane work, it is extended to support one end on the ground, and the extension force is used to position the swing support at a high position. By expanding and contracting the jacking device, the position of the swing strut can be set low when the vehicle is moving and high when working with the crane, which allows for smooth crane work and also eliminates the problem of the tip of the swing strut hitting an obstacle and being damaged when the vehicle is moving. does not occur, and furthermore,
The downward vertical load that acts on the swing support during crane work is directly supported by the ground via the jacking device without being applied to the vehicle, which has the excellent effect of not applying unreasonable force to the vehicle. It is.

By extending the jack cylinder, the position of the swing column can be selected to be high or low, which allows for smooth crane work and prevents the crane from hitting obstacles and being damaged while traveling, which is a distant relative of the practical effect. It is something.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional simple crane, Fig. 2 is an explanatory diagram of the posture of the simple crane of the present invention when it is running, and Fig. 3 is an explanatory diagram of the simple crane of the present invention during operation. . 1: Operator's cab, 9: Swivel column, 10: Boom, 7.7' and 8: Jacking device, 6: Guide cylinder.

Claims (1)

[Scope of utility model registration request] A guide tube arranged vertically in the vehicle behind the driver's cab and having an opening above and below, a swing column having a boom attached to its upper end so as to be able to be driven up and down, and a swing column attached to the lower end of the swing column and connected to the guide tube. The jacking device is comprised of a fitting tube that is slidably inserted and a ground plate at the lower end of the jacking device, which is arranged in the fitting tube. A simple crane that is located at a low position, and is extended during crane work so that one end of the crane is supported on the ground, and the swing support is positioned at a high position by the extension force.