Reduced pressure control device for moving a movable member betw

Details Reduced pressure control device for moving a movable member betw Reduced pressure control device for moving a movable member betw

1984-08-01

1987-01-27

Hershkovitz, Abraham

Expansible chamber devices

Plural flexible wall working members

24621, 24622, 74581, 92 64, 92 76, 403152, 403331, 411508, F01B 1900

Patent

active

046387234

ABSTRACT:
A housing (10, 12, 14) has first and second flexible membranes (32, 42) dividing it into two sealed chambers plus a third chamber from which the movable member (38) projects. Each membrane co-operates with a respective cup (40, 50) and return springs (54, 56) tend to urge both cups away from an end wall (26). The two cups are interconnected by a single piece member (58) which is inextensible but which can readily be bent in two to enable the cups to come into contact with one another. Each sealed chamber can individually be selectively connected to a source of reduced pressure via a respective orifice or pipe fitting (30, 28). The position of the movable member (38) can thus be changed.

REFERENCES:
patent: 732245 (1903-06-01), Weiss
patent: 2680375 (1954-06-01), Schaus
patent: 3116918 (1964-01-01), Francis
patent: 3262335 (1966-07-01), Heinlein et al.
patent: 3613513 (1971-10-01), Johnson
patent: 3981229 (1976-09-01), Breisch et al.
patent: 4231287 (1980-11-01), Smiley
patent: 4238991 (1980-12-01), Pickles

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