Electricity: circuit makers and breakers – Fluid pressure – Diaphragm
Patent
1989-01-27
1990-01-09
Tolin, Gerald P.
Electricity: circuit makers and breakers
Fluid pressure
Diaphragm
200 814, 200835, 200252, 73723, H01H 3534
Patent
active
048929859
ABSTRACT:
A multicontact vacuum responsive switch includes a housing divided into first and second chambers by a diaphragm. The first chamber is connected to a vacuum source while the second chamber communicates with atmospheric pressure, so that the diaphragm is movable within the housing in response to a pressure differential between the first and second chambers. A plate is connected to the diaphragm for movement therewith, and has an electrically conductive portion of a predetermined pattern. A plurality of electrical contacts are mounted in the housing and slidably contact the plate such that the contacts may selectively contact the electrically conductive portion of the plate in response to movement of the diaphragm means, which also cause movement of the plate. One of the contacts always contacts the conductive portion, and so is a reference contact. It can be put in electrical communication with the other contacts by the sliding movement of the other contacts into contact with the conductive portion of the plate in response to predetermined vacuum pressures in the first chamber. At least one of the contacts is adjustable in the direction of movement of the diaphragm.
REFERENCES:
patent: 3689719 (1972-09-01), Phillips
patent: 4334131 (1982-06-01), Cooper
patent: 4452202 (1984-06-01), Meyer
patent: 4648277 (1987-03-01), Obermann
patent: 4778956 (1988-10-01), Betterton
Aisin Seiki Kabushiki Kaisha
Tolin Gerald P.
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