Banded piston and method of making

Details Banded piston and method of making Banded piston and method of making

1993-07-06

1994-09-13

Look, Edward K.

Expansible chamber devices

Piston

Plural integral radially extending resilient metallic...

92240, 92250, 277170, 29888047, F16J 900, B23P 1510, F02F 300

Patent

active

053458605

ABSTRACT:
A piston for use in a hydraulic cylinder which is subject to sudden and extremely high shock load pressures and high temperature operating conditions is provided with a plurality of interlocking axially-spaced circumferential grooves. A band of a heat-formable fluoropolymer is snapped over a retaining ring integral with the piston and the piston is then moved axially through a heated hot-forming cylinder, causing the washer to conform to the cylindrical shape of the piston. At least one circumferential has a side wall which is undercut relative to its cylindrical surface to provide a locking angle. A method of washer preheating prior to hot-forming the band results in better flow of the fluoropolymer toward the undercut side wall. The method of preheating also produces a band skirt with a relatively sharply-defined sealing edge.

REFERENCES:
patent: 1584470 (1926-05-01), Quintenz
patent: 1797781 (1931-03-01), McCaughey
patent: 2176281 (1939-10-01), Stillwagon
patent: 2216577 (1940-10-01), Stillwagon
patent: 2779646 (1957-01-01), Creed
patent: 3072071 (1963-01-01), Stroud
patent: 3212411 (1965-10-01), Storms
patent: 3237953 (1966-03-01), Lucas

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