Land vehicles – Wheeled – Articulated vehicle
Patent
1983-08-12
1985-12-17
Pekar, John A.
Land vehicles
Wheeled
Articulated vehicle
280474, B60P 154
Patent
active
045588791
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a trailer for a truck with a supporting frame for a loading crane or the like, the trailer being selectively flexibly or rigidly connected to the truck.
DESCRIPTION OF THE PRIOR ART
When fastening a loading crane to the rear end of a truck problems can arise in two respects. First it must be remembered that by the actuation of the loading crane substantial moments are transmitted to the vehicle which is not equipped to absorb them. The loads alone which a typical crane can carry are in the tonnage range and swinging moments of more than 10 kNm are quite common. When the load is ahead of the crane tower these moments can be completely absorbed by the vehicle itself. When swinging out laterally, support spars, which can be extended laterally, relieve the vehicle. A jack wheel which is hinged to a shaft extending at right angles to the direction of the vehicle by means of at least one swivel arm extending to the rear and supported and fixed from above in the operating position by a holding means has been proposed for supporting the vehicle console towards the rear (see Austrian Pat. No. 186,392). However, the jack wheel permits only slight shifting of the vehicle on the site of operation and does not solve the second problem caused by the arrangement of the loading crane in the rear region of the vehicle. This is due to the fact that the dead weight of the crane of the order of 1 to 2 tons increases the axle pressure on the rear wheels to an inadmissible extent and excessively relieves the front wheels when driving uphill. This latter difficulty is responsible for the fact that heretofore loading cranes have been excluded from a field of application for which they should be predestined per se, namely their use in conjunction with mobile concrete mixers. Additionaly to the concrete mixer conveyer belts or self-contained pumping cars are used for this purpose requiring separate operating personnel and thus increasing the concreting costs particularly for small building projects. This can be remedied by loading cranes whose conveying capacity of approximately 0.5 cu m per turn permits a sufficiently fast unloading to various terminals and which can be operated by the driver of the mixer. However, the mixers are so designed so that a heavy loading crane cannot additionally be attached directly to the rear of a vehicle.
As a result of the above-mentioned there exists a need for trailers which permit selective transportation of heavy loading cranes without substantially impairing the driving characteristics of the traction vehicle and which form a solid basis for the working device, particularly for a loading crane, when the traction vehicle stops. This type of trailer having the features initially set forth has already been proposed in French Pat. No. 2,320,208. However, a console which can be rigidly connected in a conventional manner to the traction vehicle is provided on the one hand and an extensible spar on the other. This spar can be flexibly suspended in a coupling when the console is no longer connected to the traction vehicle. The rigid connection between console and traction vehicle is always brought about in the same manner without any possibility of taking into account unevennesses of the ground. Therefore, it cannot be assured that the wheels of the trailer function as supports for the console during the operating phase. Therefore, in order to prevent tilting of the front portion of the traction vehicle by the operating crane, extensible supports which completely relieve the wheels of the trailer must be provided.
Therefore, the entire construction is so cumbersome that it has not been used in practice.
OBJECT OF THE INVENTION
It is the object of the present invention to provide a trailer of the type initially described, i.e., a trailer which is of simple construction and whose wheels in the operating position rest firmly even on rough ground so that these unevennesses do not cause a tilting moment exerted on the traction vehicle.
The set task is solved in that the suppo
REFERENCES:
patent: 2720417 (1955-10-01), Kling
patent: 3342357 (1967-09-01), Larson
patent: 3425715 (1969-02-01), Weitz
patent: 3663039 (1972-05-01), Morgan
patent: 3717215 (1973-02-01), Nigg
patent: 3815939 (1974-06-01), Pettay
patent: 4200315 (1980-04-01), Carlsson
Palfinger
Pekar John A.
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