Binary action pressure switch

Details Binary action pressure switch Binary action pressure switch

1991-04-05

1992-09-22

Scott, J. R.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200 83J, H01H 3526

Patent

active

051499274

ABSTRACT:
A make-before-break pressure switch has a pair of snap-acting discs separated by a travelling spacer. At a low level switching pressure, the travelling spacer is moved by the pressure sensing diaphragm to snap one disc for moving a contact blade to close a pair of contacts. On increasing pressure, the second disc is snapped at a high level switching pressure to cause a blade spring to go over-center and effect snap actuation of the contact blade to re-open the contacts. Upon decreasing pressure reverse operation occurs; and, the over-center blade snaps the blade to close the contacts which remain closed until a low level opening pressure is reached.

REFERENCES:
patent: 4200776 (1980-04-01), Poling
patent: 4287780 (1981-09-01), Poling
patent: 4330695 (1982-05-01), Poling
patent: 4410776 (1983-10-01), Stoll
patent: 4757165 (1988-07-01), Marcoux et al.
patent: 4794214 (1988-12-01), Sanford
patent: 4820890 (1989-04-01), Tamura et al.
patent: 4939321 (1990-07-01), Tanaka et al.
SAE Paper 860472, C. E. Stanford, "Snap Action Pressure Switches for Automotive Auxiliary Systems Control", 1986.

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