DE1285703B - Telescopic boom with articulated luffing arm for a crane - Google Patents

Description

The invention relates to a telescopic boom with an articulated rocker arm for a crane, especially a truck crane.

Telescopic booms for cranes are available in different types well known. The telescopic boom is such at the upper end of the standing column arranged that the telescopic boom can be pivoted up and down. the Pivoting of the telescopic boom is via pneumatic, hydraulic or the like. Funds made.

In the so-called construction crane, the boom is designed so that with many working points can be reached with the crane. To this end, the Boom a not inconsiderable length dimension. When transporting from a construction site on the other hand, it is therefore necessary to use the boom for road transport dismantle into individual parts. But now there is a construction crane over a longer period of time is stationed on the same construction site, the dismantling of the boom in the event of road journeys as a minor evil, which on the other hand does not occur too often, accepted.

With another boom that is mounted directly on vehicles Standing columns is used, the problem is with regard to the length dimension a much bigger one. If the boom is short, it can be also control only a small number of operating points. With a longer trained More working points can be approached from booms, but this is the case Disadvantage if the vehicle is to take part in road traffic.

The reduction of the boom to the smallest possible volume In addition to a favorable design with the lowest possible weight, this is necessary for truck-mounted cranes Requirement to meet the legal requirements with regard to the dimensions. A reduction in volume happens once through a telescopic link, whereby a boom part in itself, is shortened. A further reduction takes place through folding the second boom part onto the first boom part. Through this reduction of the boom to a small volume, the crane can move across the direction of travel of the The vehicle can be stored with a truck crane without restricting the loading area.

Since a vehicle equipped with a crane is a piece of work equipment acts, which is in no way tied to a stationary position, this vehicle will also be used in many jobs. Hence, in this context a boom has become known, which has a subdivision along its length, so that the front part of the boom down when driving on the road can be turned over and blocked.

Telescopic booms have also become known at which the inner boom part has a hinged rocker arm at its front end having. The rocker arm is swiveled over a cylinder or the like. By extending of the boom part is the radius of action of the crane compared to the other boom designs a much bigger one. The rocker arm is telescopic for road traffic trained boom also folded down and in itself known Way blocked. A folding and support of the rocker arm upwards, d. H. on the boom, is in the known designs as a result of the structural training 'of the boom not given. The folding down of a boom part or a rocker arm downwards is disadvantageous in that it can be used for other purposes Space is taken up.

According to French patent specification 1211191, the assignment takes place through the pivot point of the two boom parts when the crane is empty. For this large recesses are required in the boom. It goes without saying that this type of assignment for telescopic boom parts, be it hydraulic or mechanical, cannot be used. In addition, at the moment of panning through very large forces exerted on the bearing points due to the dead point.

The USA.-Patent 3 253 716 shows an arrangement with three boom parts, which are folded together in a Z-shape. Each cantilever arm can be rotated a maximum of one angle, which is smaller than 180 °, can be swiveled. In addition, it appears that the arrangement with three cantilever arms can not be folded so minimally in order to cross in the direction of travel to be parked so that the loading area is completely free, d. H. also in height. Recesses in the main profile for the cylinders are also necessary here.

The German utility model 1925 364 shows an arrangement that only is possible with booms that have a closed hollow profile, z. B. in the second boom part, own. In the case of telescopic booms, the hydraulic cylinders are accommodated Trouble. In the case of small cranes, the arrangement is in accordance with the German utility model 1925 364 good, but it encounters constructive difficulties with large here a complicated structure results from the many joints. Because the triangular Joint piece is passed through the main point of rotation, recesses are also required here.

The inventor set himself the task of solving the problem of a simple Merging of a crane arm system for medium to heavy hydraulic cranes to solve. This applies in particular to cranes that have a lifting arm and a telescope in the luffing arm and consequently made of box sections. This object is achieved according to the invention solved in that at the front end of the telescopic member via an intermediate joint the rocker arm is articulated with its cylinder, with the cantilever arm and rocker arm each an overhead, provided with a hole bracket or the like. For hanging a linkage have, in such a way that when the telescopic member is extended and the linkage is attached the rocker arm with its cylinder on an arc around the articulation point upwards pivots and is supported on the extension arm.

The advantage of the subject matter of the invention over the known Cranes can be seen in the fact that the boom parts have box sections and can still be pivoted. The pivoting in the working position takes place by the so-called rocking cylinder. There can be an angle with this pivoting can be achieved, which is less than a maximum of 180 °. To another pivot these cylinders are not used for the storage position. Another advantage the subject of the invention is that the rocker arm together with the cylinders, who put him in work Have pivoted position, now as a unit can be pivoted around a new pivot point. This pivoting takes over the telescopic cylinder. In the subject matter of the invention, no large recesses are which reduce the strength of the cantilever arms, is required. With the invention Arrangement, heavy crane booms can also be brought into a storage position.

An embodiment of the invention is shown in the drawings. In these, FIG. 1 a telescopic boom with an articulated luffing arm and introduced Linkage, F i g. 2 the telescopic boom according to FIG. 1 with extended boom part and deflected rocker arm and F i g. 3 the telescopic boom with a blocked luffing arm.

The boom part 1 of the telescopic boom is connected in an articulated manner to the luffing arm 3 via intermediate joints 1 ″ and 1 '. The luffing arm 3 is pivoted via a luffing cylinder.

The boom part 1 and the boom part 2 have known replaceable Sliding blocks 6, 7, which guide and support the boom part 1 in the boom part 2 serve.

On the upper side, the boom part 2 has a tab 4 with a hole 4 '. On the top of the rocker arm 3, a tab 4 provided with a hole 4 'is also arranged. The bores 4 'of the tabs 4 serve to receive and hold a rod 5.

The tilting of the rocker arm 3 takes place in detail as follows: The rocker arm 3 is approximately in a horizontal position over the cylinder located on the underside Line brought to boom part 2. In this position is in the holes 4 'of the tabs 4 the linkage 5 is used (see FIG. 1). Then the boom part 1 extended. During this extension process, the rocker arm 3 pivots with his Cylinder around the pivot point A on an arc upwards until the rocker arm 3 the in the F i g. 2 position shown. The linkage 5 is then removed from the bores 4 'and the boom part 1 moved back into its starting position. The two holes 4 'of the tabs 4 are - when the boom part is retracted is - in front of each other, and to lock the rocker arm 3 is a bolt or the like. in the same, 4, inserted. The telescopic boom is after folding down the rocker arm 3 and retraction of the boom part 1 is shortened to about a third of its total length.

The extension of the telescopic boom in the working position takes place in reverse order as described above, d. i.e., the boom part 1 is extended, then the rod 5 is inserted again into the bores 4 'of the tabs 4 and by moving the boom part 1 back, the rocker arm 3 with its cylinder again brought into the horizontal position for boom part 2.

Claims (1)

Claim: Telescopic boom with articulated luffing arm for a crane, especially a truck-mounted crane, characterized in that the luffing arm (3) is articulated with its cylinder at the front end (1 ') of the telescopic element (1) via an intermediate joint (1 "and 1"') is, with the cantilever arm and luffing arm each have an overhead tab (4) or the like provided with a bore (4 ') for attaching a rod (5) so that when the telescopic member and the attached rod are extended, the luffing arm and its cylinder open Pivots an arc around the pivot point (A) upwards and is supported on the extension arm (2).