Electricity: circuit makers and breakers – Fluid pressure – Piston
Patent
1980-07-18
1982-06-08
Tolin, Gerald P.
Electricity: circuit makers and breakers
Fluid pressure
Piston
338 39, 200 814, H01H 3538
Patent
active
043341314
ABSTRACT:
A multi-stage pressure switch (10) transduces partial vacuum pressure levels to corresponding electrical outputs. The switch (10) comprises a vacuum housing (12) having a bore (16) therein and a port (14) at one end. Positioned within the bore (16) and in engagement with one end of a coaxial spring (48), is a rubber piston (50) having an integral lip seal (54) which wipably engages the wall of the bore, the piston (50) also having a socket (56) disposed therein. A U-shaped switch drive arm (38) has a drive arm extension (40) and ball (41) received within the socket (56) of the rubber piston (50). Contactors (42, 43, and 44,45) are mounted on opposite sides of the drive arm (38). A switch housing (28) having two sets of terminals (32, 33, and 34,35) extending into the housing and terminating at different levels is joined with the vacuum housing (12). A partial vacuum created in the vacuum housing by withdrawal of atmosphere through the port (14) draws the rubber piston (50) against the opposing force of the spring (48). As atmosphere re-enters the vacuum housing (12), the spring (48) displaces the rubber piston (50) toward the switch housing and the first set of contactors (42,43) engages its associated first set of terminals (32,33), completing a circuit and effecting a first electrical output. Further reintroduction of atmosphere results in further movement of the piston (50) and the second set of contactors (44,45) engaging the second set of terminals (34,35) to produce a second electrical output.
REFERENCES:
patent: 2127429 (1938-08-01), Schoepf
patent: 2898566 (1959-08-01), Bacca
patent: 2899516 (1959-08-01), Smith
patent: 3002063 (1961-09-01), Giladett
patent: 3069645 (1962-12-01), Henke
patent: 3284595 (1966-11-01), Heath
patent: 3746810 (1973-07-01), Parsons
patent: 4150264 (1979-04-01), Lieberman
patent: 4152559 (1979-05-01), Davis
Cooper Steven R.
Shaw Kenneth L.
CTS Corporation
Palguta Larry J.
Tolin Gerald P.
Young John A.
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