Metal working – Method of mechanical manufacture – Obtaining plural product pieces from unitary workpiece
Reexamination Certificate
1996-11-04
2003-02-04
Bryant, David P. (Department: 3726)
Metal working
Method of mechanical manufacture
Obtaining plural product pieces from unitary workpiece
C228S155000
Reexamination Certificate
active
06513219
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns the production of ring collars of the type used in some diaphragm clutch mechanisms to provide an axial support to the diaphragm on the side opposite the axial support which is found at the bottom of the cover of such a mechanism.
These ring collars are in the shape of a truncated cone overall.
2. Description of the Prior Art
To produce ring collars it is possible, for example, to cut and stamp a metal blank.
But the corresponding production method leads, expensively, to large amounts of waste, notably on the inside of the ring collar obtained.
It is also possible to cut and stamp a tube.
But this production involves, in an equally expensive manner, the prior production of such a tube, and if this is a blind tube, there is still a considerable amount of waste at the corresponding end of the latter.
SUMMARY OF THE INVENTION
The object of the invention is a more economical production method.
Relating, therefore, to the production of a ring collar, this method is characterised in that, stating with a metal strip, this strip is wound helically, a length corresponding to one pitch of the helix is cut from this strip, the two ends of this length are acted upon axially in such a way that they are brought opposite one another, the two ends thus aligned are welded to one another so as to obtain a cylindrical ring, and this ring is formed into a truncated cone.
All these operation, which advantageously involve no waste, can advantageously be executed one after the other on the same machine.
REFERENCES:
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patent: 2728976 (1956-01-01), Kraus
patent: 2948322 (1960-08-01), Cox et al.
patent: 3778877 (1973-12-01), Walker
patent: 4320565 (1982-03-01), Warchol
patent: 1078153 (1980-05-01), None
patent: 453167 (1991-10-01), None
Patent Abstracts Of Japan vo. 10 No. 307 (M-527) Oct., 1986 JP,A, 61-119344 Jun. 1986.
Patent Abstracts of Japan vo. 8 No. 148 (M-308) Jul. 1984 JP,A, 59-045044 Mar. 1984.
Patent Abstracts of Japan vo. 10 No. 246 (M-510) Aug. 1986 JP,A, 61-076222 Apr. 1986.
Drago Mario
Lanzarini Ernesto
Bryant David P.
Liniak Berenato & White
Valeo
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