Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Patent
1995-12-22
1998-09-22
Cuda, Irene
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
29888074, 29557, B23P 500
Patent
active
058096434
ABSTRACT:
A method for making non-circular piston rings which will precisely sealably conform to the cylinder wall of an internal combustion engine. In accordance with the method a metal strip of special cross-sectional configuration is coiled about a specially configured mandrel which is non-circular in cross section. Preferably the coiling mandrel is provided with a circumferentially interrupted thread form that has a zero helix angle along most of its circumference. During the coiling operation, using this type of mandrel, the metal strip is preformed at specific locations along its length into an angled configuration to form a coil body having a plurality of coils that have a zero helix angle along most of their circumference and a relatively steep helix angle for a short distance. After the coil is formed, the helix angle portions are cut therefrom to provide a plurality of generally planer, interrupted rings.
REFERENCES:
patent: 1018149 (1912-02-01), Wright
patent: 1450346 (1923-04-01), Anderson
patent: 2280552 (1942-04-01), Somes
patent: 2453330 (1948-11-01), Marshall
patent: 4937937 (1990-07-01), Bruce
patent: 5068963 (1991-12-01), Bruce
Brunton James E.
Cuda Irene
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