Normally closed pressure responsive switch

Details Normally closed pressure responsive switch Normally closed pressure responsive switch

1990-05-25

1991-09-17

Broome, Harold

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200 83J, 200 83N, H01H 3534

Patent

active

050497081

ABSTRACT:
A normally closed pressure responsive switch has upper and lower housings attached to one another with an electrically conductive snap acting disc placed therebetween. The lower housing includes a base having a recessed area in which a stationary electrical contact is mounted. The snap acting disc is placed on top of the base with a side having a convex configuration facing the stationary contact. An electrically conductive member is placed over the disc with a plurality of contact tabs engageable with the outer peripheral portion of the disc. The upper housing includes a retainer having a bore in which a pressure converter slides. Ribs formed on the bottom of the pressure converter are adapted to engage the outer peripheral portions of the disc between the contact tabs and are captured in grooves of the retainer to restrict angular movement of the pressure converter. A flexible membrane is placed on top of the retainer and pressure converter and an O-ring is received on top of the membrane to seal the pressure receiving surface of the flexible membrane to a pressure source when the switch is mounted for use.

REFERENCES:
patent: 4091249 (1978-05-01), Huffman
patent: 4342887 (1982-08-01), Sanford
patent: 4861953 (1989-08-01), Sanford
patent: 4948931 (1990-08-01), Nixon et al.

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