Piston assembly with primary and co-centric secondary portions

Details Piston assembly with primary and co-centric secondary portions Piston assembly with primary and co-centric secondary portions

1990-07-16

1992-07-14

Denion, Thomas E.

Expansible chamber devices

With inspection window in expansible chamber wall portion

With lock

92 61, 92 62, 92 75, 92107, 92181P, 91189R, 91189A, 91401, 91440, F01B 2526, F01B 700

Patent

active

051293110

ABSTRACT:
A piston assembly comprising a primary piston and a co-centric secondary piston. The pistons are received within a housing for reciprocating movement therein and relative to each other. The housing and the pistons are arranged for operating pressure to be applied to the secondary piston so as to drive both pistons within the housing. The secondary piston is provided with means enabling the operating pressure to be equalized across the secondary piston and at least one bypass passage extends through the secondary piston. The arrangement is such that upon completion of the stroke of the pistons pressure equalization occurs across the secondary piston which causes the pistons to separate. The bypass passage becomes fully operable subsequent to pressure equalization, whereby a fast return stroke is achieved.

REFERENCES:
patent: 2531907 (1950-11-01), Daubenmeter et al.
patent: 2649842 (1953-08-01), Caldwell et al.
patent: 2932280 (1960-04-01), Vielmo
patent: 3149541 (1964-09-01), Hutter et al.
patent: 4308018 (1981-12-01), Nakamura et al.
patent: 4337687 (1982-07-01), Hoover
patent: 4445424 (1984-05-01), Foster et al.
patent: 4687449 (1987-08-01), Fenrich
patent: 4706781 (1987-11-01), Ikimi et al.

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