Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1999-05-18
2000-06-27
Tolan, Ed
Metal deforming
By application of fluent medium, or energy field
Using fixed die
72 183, 72 215, 723425, 723792, 72705, B21D 2210
Patent
active
060792450
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a device for straightening out damaged metal and plastic elements, namely having bumps and notwithstanding the damage maintaining the main original shape.
DE 94 03 156 U (ROTH MATTHIAS) describes a device for straightening out elements in plastic material. It is not intended to be used for metal elements. This device straightens the elements by means of a body (3) being able to expand by means (2), the body (3) being placed between an abutment and the piece. The device described in this document does not include a template having the original shape of the element to straighten. Furthermore, the device described in this document does not include means for heating the element to straighten.
U.S. Pat. No. 4,171,631 (13UTTS CLIFFORE) describes a device for straightening out a vehicle door and is not intended to straighten just any piece of a motorcar. This device includes an expansible balloon, which is placed inside a door, namely between the walls of the door. In no case an abutment is placed externally to the piece, on which the balloon leans, because the internal wall of the door plays this abutting role. This device allows straightening out elements having two walls and its use is therefore limited. Furthermore, this device does not include a template having the original shape of the piece to straighten. Besides, it does not include means for heating the part of the element to straighten.
U.S. Pat. No. 2,804,118 (BAYERKOHLER) describes in FIG. 1 a device for straightening out car-bodies which includes two pressure plates 5 and 7 that are placed between two walls 65, 67 of a motorcar door, the wall 67 being deformed. This document does not describe nor suggest the utilisation of a template having the original shape of the element to straighten. This document does not describe the use of a device for heating the element to straighten. Presently the straightening is made by means of tools of different forms, using the principle of the lever, or by points of welding made to the exterior of the damaged part, which, generally, involves corrosion and neutralises all the protections (galvanised or others) of the straightened element.
For instance, a present process provides to bare the sheet metal and to weld on it small hollow tablets on a point of their periphery. An end of a tool forming a hook is hooked in the hollow of said tablet. A sliding hammer allows hammering on the end opposite to the tool in such a way to pull the metal sheet and to straighten it out. After straightening, tablets are eliminated with the aid of the tool by carrying out a rotation, then the welding point is removed, for example with the aid of a trimming disk, and the metal sheet filled. Such a process has the scope to greatly reduce the thickness of the metal sheet and therefore to weaken it.
This invention has the scope to avoid the drawbacks of the known means and relates to a device for straightening out deformed elements which is easy to use, safe, effective and simple to realise.
The invention allows carrying out a straightening without altering the elements of the surrounding surface such as the paint, finishing, galvanisation and electro-zinc-coating.
Furthermore, the invention provides a device for straightening out deformed elements, maintaining the original elasticity of the elements to treat and in this way the passive safety of the users of the vehicle.
The invention presents the advantage to provide a device for straightening out deformed elements all preventing the corrosion of the straightened elements.
The device according to the invention allows the straightening of deformed elements, also in the case where they are not easily accessible.
The invention allows therefore the straightening of deformed elements facilitating the straightening, which allows to reduce the intervention time, saving in materials, improving the safety of the work, these advantages reflecting on the final cost of the restoring and of their quality.
For this purpose, the device for straightening out deformed elements accor
REFERENCES:
patent: 4358946 (1982-11-01), Gallant
patent: 5619876 (1997-04-01), Choi
patent: 5634361 (1997-06-01), Herschman et al.
patent: 5747693 (1998-05-01), Abbate et al.
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