Metal deforming – By or with work-constrainer and/or manipulated work-forcer
Patent
1995-12-29
1997-09-02
Larson, Lowell A.
Metal deforming
By or with work-constrainer and/or manipulated work-forcer
72705, B21J 1308
Patent
active
056619952
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an aligner for damaged vehicle bodywork and vehicle chassis and represents a further development of the aligner arrangement in accordance with Swedish Patent No. 7712423 (U.S. Pat. No. 4,309,895).
The aforementioned previously disclosed aligner arrangement has proved to be appropriate for the repair and alignment of damaged vehicles, most of all in conjunction with the alignment of damaged vehicle cabs and car bodywork. The advantages are largely attributable to the adaptability of the aligner arrangement to all forms of damage to a vehicle unit, as well as to the premises concerned. This was made possible by the fact that the aligner arrangement in question is a portable aligner equipped with folding wheels, which permit alternative positioning of the aligner unit in relation to the damaged vehicle and also permit the aligner to be lowered into contact with a workshop floor and secured to it by means of bolted connections or similar clamping devices. In the aforementioned previously disclosed embodiment, the aligner comprises a longitudinal alignment bar executed with a longitudinal guide for a carriage supported in such a way as to be capable of displacement. This is supported in roller bearings in the aligner and is equipped with alignment devices for exerting a pulling or pushing effect on the damaged vehicle unit. The force required for performing such operations is provided via controlled displacement movements of the carriage relative to the alignment bar, which movements are counter-balanced by servo-controlled actuating devices, for example hydraulic devices, anchored to the alignment bar. Forces acting obliquely in relation to the longitudinal extent of the alignment bar often make their effect felt during such operations. This imposes considerable stresses on the roller bearings and gives rise to higher surface pressures in the bearing channels of the alignment bar, which stresses cause wear to take place which reduces the service life of said units.
The object of the present invention is to eliminate the aforementioned disadvantages and to increase the effective power range of such aligners, and also to facilitate the manageability of such aligners through a reduction in weight and a simplified wheel positioning mechanism. Like the previously disclosed aligner arrangement, the invention relates to a portable longitudinal aligner equipped with folding wheels capable of adjustment between a working position, in which the aligner is in contact with a floor or the like, and a transport position, in which the aligner adopts a free position relative to the floor. The aligner in accordance with the present invention consists of a lower part executed as a frame and an upper part, a so-called slide, supported therein in such a way as to be capable of displacement, which upper part is so arranged as to be caused to move in the longitudinal sense of the lower part by at least one actuating device arranged therein. The invention is thus characterized in that the upper part is executed with a uniform longitudinal cross-sectional profile, which engages in a corresponding uniform longitudinal cross-sectional profile on the lower part and that the lower part and the upper part are executed in their interacting parts with dovetail-shaped profiles which engage in each other and permits the upper part to be caused to move relative to the lower part with stable support for its entire length. The longitudinal extent of the upper part is preferably more than two thirds of the longitudinal extent of the lower part, which means that the relative displacement of the upper part in the lower part cannot exceed one third of the length of the lower part. The lower part, the so called frame, and the upper part, the so called slide, are preferably aluminium components.
The invention is further characterized in that the lateral surfaces of the upper part have male dovetail-shaped projections which engage in female dovetail-shaped grooves on the inner lateral surfaces of the lower part. In the
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Josam Lastbilteknik AB
Larson Lowell A.
Tolan Ed
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