Variable differential adjustor

Details Variable differential adjustor Variable differential adjustor

2006-08-01

2006-08-01

Lee, Richard K. (Department: 2832)

Electricity: circuit makers and breakers

Fluid pressure

Flow-responsive type

C200S061040, C200S081800, C073S861420, C340S605000, C340S626000

Reexamination Certificate

active

07084363

ABSTRACT:
A variable differential adjustor for a fluid pressure-actuated switch, with the fluid, in the preferred form of the invention, being air. The restrictor has a restrictor housing with a fluid passage in which a restrictor plug, typically a set screw, is engaged. By judicious adjustment of the position of the set screw, fluid flow to and from a pressure-actuated switch is controlled, controlling when the switch is activated to control apparatus such as a sump pump, and when the switch is deactivated.

REFERENCES:
patent: 4278856 (1981-07-01), Owens
patent: 5155310 (1992-10-01), Goans
patent: 5478977 (1995-12-01), Beasley
patent: 5672049 (1997-09-01), Ciurlo
patent: 6472624 (2002-10-01), Harris et al.
patent: 6495777 (2002-12-01), Chou

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