FI71538B - STYRHYTT FOER LYFTKRAN - Google Patents

Description

71 538

CRANE CAB - STYRHYTT FÖR LYFTKRAN

The present invention relates to a crane cab which is intended to be fixed to the vertical boom of the crane so as to follow the pivoting movements of the crane and which can be fixed to the crane by means of a telescopic fastening means movable between the lower or transport position and the upper or operating position.

The crane cab is designed for use primarily in mobile cranes. In a mobile crane, the driver's seat is usually designed so that a seat is attached to the top of the crane frame at a height of about 3.5 meters from the ground, where the driver can use the crane's controls and has sufficient visibility.

Swedish Publication No. 425 969 discloses a crane cab that is movable between a transport position and an operating position. The disadvantage is that a cab like this takes up a lot of space even when it is in the transport position.

In addition, fixed cabs are already known which eliminate at least the problems caused by the weather.

The disadvantage of fixed cabs is that they are not suitable for vehicle use, as they increase the height of the vehicle beyond the maximum permissible height when installed high enough for the operation of the crane. In addition, the known constructions take up a considerable amount of space, which is not possible in vehicle use due to the cramped space between the tractor and the trailer.

The object of the present invention is to eliminate the above drawbacks. The crane cab according to the invention is characterized in that the fastening member is in an oblique position between the cab and the crane's vertical boom, so that the cab is at the same time moved forward against the crane's vertical boom in the lowered position. The main advantage of the invention can be considered to be that 2,71538, when the cab moves forward at the same time as it is lowered to its lower or transport position, it takes up very little space.

A preferred embodiment of the invention is characterized in that the attachment 1 in consists of a guide tube attached to the lower end of the vertical boom of the crane, within which the foot beam attached to the cab is movable. A construction like this is very reliable and inexpensive.

Yet another embodiment of the invention is characterized in that the seat in the cab pivots up to the transport position against the rear wall of the cab when the cab moves to the lower or transport position. In this way, the cab is brought as close as possible to the vertical boom of the crane.

The invention will now be described by way of example with reference to the accompanying drawing, in which

Figure 1 shows a cab according to the invention in the operating position. Figure 2 shows the cab in the transport position.

The device according to the invention consists of a fixed cab part 1 and a fastening mechanism, parts 2, 3 and 4.

The tube frames 5 and 6 form the frame of the cab part 1 and at the same time act as a safety frame. The cab walls 7 and the roof 8 are attached to the frame 5. The cab part can also be implemented with a sufficiently strong plastic hood. Attached to the rear pillar 6 is a crane driver's seat 9, which is articulated so that it pivots upwards against the rear wall in the transport position. (see Figure 2).

The cab is attached to the movable leg 2 in the guide 3 by means of a cross member 10. The guide tubes 3 are welded to the fastening piece 4. The fastening to the crane is carried out to the lower end of the crane's vertical boom by means of the fastening piece 4 using the crane lifting lugs.

li. 3 71538

Parts 4, 3, 2, 10 and 6, from below, form a safety bar to protect the crane operator.

When using the device, the driver uses the hydraulic cylinder to move the cab from the transport position to the upper position, i.e. the operating position. In this case, the seat 9 in the cab is at approximately the same position as used in current crane constructions, so that the crane controls are in the right position in relation to the driver. The driver climbs up ladder 11 and enters from the front of the cab and sits down.

When the cab is moved to the transport position, the seat 9 automatically rises to the upper position by spring force. The cab is lowered hydraulically, so that the canopy rests around the crane's vertical boom and on the controls, protecting them during transport.

The basic version shown above is intended for use when the main emphasis is placed on keeping the driver's position at the same position as before and when the described protection is adequate.

In particular, it should be noted that the cab according to the invention can also be mounted on the side of the crane's vertical boom, in which case it is possible to use a closed cab, which provides better protection against the weather than the basic version. In this case, the crane controls are transferred to the cab and in the operating position the cab is raised above the vehicle load to meet space requirements.

Claims (3)

71538 A crane cab (1) which is intended to be attached to the vertical boom of a crane so as to follow the pivoting movements of the crane and which can be attached to the crane by a telescopic attachment 1ime 11 (2,3), by means of which the cab can be moved to a lower or transport position (Fig. 2) and the upper or operating position (Fig. 1), characterized in that the attachment?] (2,3) is in an oblique position between the cab (1) and the crane's vertical boom so that the cab is a 1 as 1 at the same time moved forward against the vertical boom of the crane. A crane cab according to claim 1, characterized in that the fastening member (2,3) consists of a guide tube (3) attached to the lower end of the vertical boom of the crane, within which the leg beam (2) attached to the cab is movable. Crane cab according to Claim 1 or 2, characterized in that the seat (9) in the cab (1) pivots up to the transport position against the rear wall of the cab when the cab moves to the lower or transport position.