Expansible chamber devices – Plural flexible wall working members
Patent
1977-01-28
1979-04-03
Schwadron, Martin P.
Expansible chamber devices
Plural flexible wall working members
92 49, 92 94, 92 99, F01B 1900
Patent
active
041470940
ABSTRACT:
A vacuum operated device is provided with a first vacuum chamber defined by a part of a casing and a first diaphragm; a second vacuum chamber defined by the first diaphragm, another part of the casing, and a second diaphragm; and a rod. The first vacuum chamber communicates with a vacuum source and the second vacuum chamber also communicates with the vacuum source through a changeover valve by which the second vacuum chamber is subjected to the vacuum from the vacuum source or to atmospheric pressure. The rod is secured to the first and second diaphragms at the central portions thereof thereby being axially movable according to the movement of the first and second diaphragms. The vacuum operated device further is provided with a first spring for subjecting the first diaphragm to a spring force opposite to the force that is exerted on the first diaphragm by the vacuum in the first vacuum chamber, and a second spring arranged functionally in series with the first spring for subjecting the rod to a force opposite to the force exerted on the rod by the first and second diaphragms, whereby the rod can be made to have two modes of movements thereby providing different kinds of spark advance characteristics.
REFERENCES:
patent: 2667150 (1954-01-01), Coar
patent: 3116918 (1964-01-01), Francis
patent: 3375838 (1968-04-01), Cheek
patent: 3613513 (1971-10-01), Johnson
patent: 3618473 (1971-11-01), Miller
patent: 3824903 (1974-07-01), Hahn
Hershkovitz Abraham
Hitachi , Ltd.
Schwadron Martin P.
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