Metal deforming – By use of non-deforming work-gripping clamp and relatively... – By individually non-deforming clamps
Patent
1998-10-05
2000-07-11
Jones, David B.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
By individually non-deforming clamps
72305, 72708, B21J 1308
Patent
active
060855681
DESCRIPTION:
BRIEF SUMMARY
1. Field of the Invention
The invention relates to an adjustable force deflection device for motor vehicle body straighteners used for repairing deformed vehicle bodies, using a hydraulically movable pull beam, pull tower or similar force applying mechanism, which is pivoted to the straightening frame, for fastening to the pulling elements, such as chains, hooks, clamps, or similar tools, which are to be attached to the places to be restored.
2. Description of the Related Art
A great many pulling tools for restoring deformed vehicle bodies are known, which tools are attached at one end to so-called pull beams, pull towers or the like, for example by means of chains, and which are capable at a second end of engaging plate edges, door posts, shock absorber supports and the like to exert a pulling force on them.
A major drawback of these conventional devices is the fact that the hold-down elements used for straightening and forming, which extend from the pull beam, are all designed to exert only pulling forces. This requires a rectilinear direction of pull at all times, which cannot in all cases lead to the point on the vehicle that is to be restored. In practice it is usual, therefore, to deflect the line of pull of the chain that is typically used from the pull beam to the point of attachment on the vehicle body, using additional hydraulic pulling means, to effect a different direction of pull with respect to the point of attachment, which is a laborious activity. This requires the use of additional complicated tools and additional operations for attaching and supporting additional hydraulic devices. These devices can only be used to a limited degree and only in a few cases, however, since it is necessary to find a strong support, which is capable of taking up the force to be deflected, if said force cannot be exerted directly from the straightening machine at the required place of attachment on the vehicle body. In addition, there is a danger that the known method of deflecting forces will lead to deformation of body parts that were previously undeformed. A double deflection, for example according to a line of pull that extends partially in a horizontal plane and partially in a vertical plane, or at an angle therebetween, may be theoretically possible with the known deflection systems, but in practice, however, it is impracticable.
Another major drawback of known straightening machines is the fact that they require a large amount of space circumferentially for the straightening operations, in view of the large pivoting area of the pull beam. Since it must be possible to exert the required pulling force in all directions via the pulling elements attached to the vehicle body, a large working area is required for carrying out all straightening operations.
In spite of the many variations that are possible, the known devices cannot be used effectively at all places on the vehicle body, for example in the trunk, the engine compartment, in the area of the wheel housings and of other internal constructional elements, such as the universal joint and drive gear tunnels, which extend at a great many different angles, because accessibility is limited at those locations.
Consequently it is an object of the present invention to provide a force deflection device for motor vehicle body straighteners used for repairing deformed vehicle bodies, using a known hydraulically moved pull beam or pull tower, which is pivoted to the straightening frame, which is intended for use in the known devices of the kind referred to in the introduction, and by means of which the above-described drawbacks can be overcome.
It is another object of the invention to simplify and improve the use of sets of straightening elements for arranging and setting up the vehicle bodies on the straightening machine, and also to increase the operating range of the sets of straightening elements while using few elements.
BRIEF SUMMARY OF THE INVENTION
These and other objects are accomplished by a force deflection device for motor vehicle straighteners comp
REFERENCES:
patent: 2245806 (1941-06-01), Oeckl et al.
patent: 2668727 (1954-02-01), Zinke
patent: 3385093 (1968-05-01), Menser
patent: 4959991 (1990-10-01), Andersson
patent: 5916322 (1999-06-01), Venalainen
Jones David B.
Robinson William L.
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