Expansible chamber devices – Piston – Radially adjustable side wall portion
Patent
1975-11-03
1977-05-03
Cohen, Irwin C.
Expansible chamber devices
Piston
Radially adjustable side wall portion
92250, 277165, 277187, F16J 106
Patent
active
040207501
ABSTRACT:
A piston pump mechanism includes a plunger head slideably mounted within a cylindrical sleeve member. The plunger head has an upper portion forming a shoulder and a reduced lower portion around which an inner ring of resilient material is mounted. An outer ring of resilient material, such as tetrafluroethylene, for example, is mounted around the inner ring. A piston rod has an end coupled to the transverse face of the reduced portion of the plunger head in such manner to provide axial adjustment therebetween, and a pressure cap is mounted upon this end. The pressure cap has a cylindrical like peripheral rim for applying a progressively greater axial force against the inner ring, causing the inner ring of material to apply a progressively greater radial force against the outer ring, as the piston rod and cap assembly are axially adjusted toward the plunger head, until the outer ring of material seals against the interior wall of the sleeve.
REFERENCES:
patent: 994558 (1911-06-01), Aspinwall
patent: 1325006 (1919-12-01), Dearsley
patent: 1570043 (1926-01-01), Cormier
patent: 1728591 (1929-09-01), Brauer
patent: 1955157 (1934-04-01), Wayne
patent: 2157039 (1939-05-01), Van Hooydonk
patent: 2298584 (1942-10-01), Onidns
patent: 2394687 (1946-02-01), Hein
patent: 3300225 (1967-01-01), Shepler
patent: 3636824 (1972-01-01), Clark
Freimuth Gerhart William
Weiner Jerold Samuel
Cohen Irwin C.
Gerhart Engineering and Machine Co.
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