Electricity: circuit makers and breakers – Fluid pressure – Diaphragm
Patent
1994-03-16
1995-10-24
Tolin, Gerald P.
Electricity: circuit makers and breakers
Fluid pressure
Diaphragm
73745, 2003021, H01H 3534
Patent
active
054612080
ABSTRACT:
A pressure switch particularly adapted for use with high pressure fluid is shown having a frusto-conical support surface in the form of a protuberance (121, 121') formed at the center of a surface of a piston guide member (12, 12'). A stretchable diaphragm cap member (14, 14') generally in the shape of an inverted V is closely fitted on the protuberance (121, 121') of the piston guide member (12, 12') as well as the head (111b) of a piston member (111, 111') received in and projecting out of bore (120, 120'a) formed centrally through protuberance (121, 121'). The outer thickened peripheral berm (143, 14'a) of the cap member (14, 14') is inserted into a recess (102e, 102'e) in the wall defining an enlarged portion of the bore (102) which in turn opens to a cavity (103, 103') of the upper housing (10, 10') in which piston guide member (12, 12') is disposed. The cap member (14, 14') serves to seal the fluid passage side of the switch from the remainder of the switch. In several embodiments a ring (40, 400, 410) is placed between the cap member (14, 14') and the conical support surface (121, 121') to reduce sliding friction and to prevent extrusion of the cap member material into a gap formed between the piston member (111, 111') and the piston guide bore (120).
REFERENCES:
patent: 3302269 (1967-02-01), Cooper et al.
patent: 4091249 (1978-05-01), Huffman
patent: 4356365 (1982-10-01), Siiberg
patent: 4469923 (1984-09-01), Charboneau
patent: 4495389 (1985-01-01), Place
patent: 4644116 (1987-02-01), Miyakawa
patent: 4794214 (1988-12-01), Sanford
patent: 5153396 (1992-10-01), Cummings
Baumann Russell E.
Donaldson Richard L.
Grossman Rene E.
Texas Instruments Incorporated
Tolin Gerald P.
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