Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Deforming the surface only
Patent
1976-02-18
1977-10-04
Kucia, Richard R.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Deforming the surface only
264295, 264320, 264322, B29D 1500
Patent
active
040525023
ABSTRACT:
A method for manufacturing bidirectional hydrodynamic polytetrafluoroethylene shaft seals. A flat annular wafer of polytetrafluoroethylene of constant thickness is coined at an annular inner portion adjacent the inner periphery to provide first and second circular ribs and a series of straight segmental ribs, each of which extends tangential to the inner side of the inner rib, thereby intersecting the inner rib, the crest of the straight ribs projecting out further than the crest of the inner rib. Then the annular inner portion is formed into a generally frustoconical shape, whereby the straight ribs appear as curved ribs. The frustoconical portion is flexed on installation on a shaft to be generally cylindrical from at least the outer rib to the inner periphery.
REFERENCES:
patent: 2456262 (1948-12-01), Fields
patent: 2781552 (1957-02-01), Gray
patent: 2990206 (1961-06-01), Bagdon
patent: 3432587 (1969-03-01), Shinn
patent: 3549445 (1970-12-01), McMahon
patent: 3857156 (1974-12-01), Clark
Federal-Mogul Corporation
Kucia Richard R.
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