Metal deforming – By or with work-constrainer and/or manipulated work-forcer
Patent
1992-05-05
1993-10-19
Larson, Lowell A.
Metal deforming
By or with work-constrainer and/or manipulated work-forcer
72705, B21D 112
Patent
active
052535096
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a straightening device for a car body.
Straightening devices for a car body are known in prior art, in which a vehicle is driven onto driving plates and in which the vehicle is fixed to a straightening table from so-called sill fasteners. In this way, the vehicle can be firmly fixed to a working stand, by means of which the vehicle can be lifted to the desired height and repair position. Separate straightening units and straightening heads can be mounted on the straightening table, and their joining to the beams of the straightening table has in the solutions of prior art been performed by leading a beam of a rectangular cross-section inside a beam structure of the straightening table, which beam structure has a corresponding form but dimensions deviating therefrom, whereby a telescopic structure is obtained. This telescopically joined structure is locked by leading a bolt both through an outer beam structure and a beam structure located more inside relative thereto. Since the innermost and the outermost beam must have a clearance relative to each other, the joint becomes flexible and it does not offer the best possibilities of performing a demanding and dimensionally accurate straightening work.
OBJECTS AND SUMMARY OF THE INVENTION
The object of the invention is therefore to find an improvement on the joining problem, and it has been realized in the invention that it is advantageous to form the telescopic joint into a rigid form meeting the straightness requirements by forming a wedge coupling between an inner beam section and a beam section arranged more outside relative thereto.
The inventive straightening device for a car body is mainly characterized in that the equipment comprises a straightening unit joined to a straightening table, to its beam, which unit comprises a tool connected thereto or connectable thereto, by means of which a force can be concentrated on the object to be straightened, whereby the joint between the above-mentioned straightening unit and the straightening table is realized by leading a beam connected to the straightening unit inside the beam of the straightening table, and that the equipment comprises in connection with the straightening unit such a beam structure that at least the second beam section can be moved relative to the first beam section, whereby said sections comprise a surface diagonal relative to the center axis of the beam structure, and that the equipment comprises a power unit, by means of which the upper surface of the movable beam is brought into contact with the inner surface of the beam structure of the straightening table, whereby the upper surface of the beam structure aligns the straightening unit in the same horizontal direction as the straightening table and whereby the beam is by means of the power unit wedged relative to the beam section cooperative relative thereto, when the surfaces of the beam sections, which surfaces are cooperative relative to each other and diagonal relative to the center axis, are pressed against each other and kept together, as the actuator ensures a friction joint.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is next described with reference to certain preferred embodiments of the invention shown in the figures of the accompanying drawings, to which the invention is not intended solely to be limited.
FIG. 1 shows as a side view a straightening device for a car body, and also a straightening unit joined to the straightening table of the straightening device, the fixing of which unit is realized in the inventive manner.
FIG. 2A shows the joint structure of FIG. 1 as a side and cross-sectional view.
FIG. 2B illustrates the joining solution of FIG. 2A.
FIG. 2C shows the joint structure provided with two wedge pieces.
FIG. 3 shows another embodiment of the inventive joint structure provided with rollers.
FIG. 4 shows the use of the inventive joint structure, when a straightening head is joined to a separate straightening unit of the straightening table.
FIG. 5A shows
REFERENCES:
patent: 4824303 (1989-04-01), Dinger
patent: 5095729 (1992-03-01), Bundy
Autorobot Finland KY
Larson Lowell A.
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