Filter bypass switch

Details Filter bypass switch Filter bypass switch

1998-09-29

2000-07-04

Luebke, Renee

Electricity: circuit makers and breakers

Fluid pressure

Piston

200 819M, H01H 3538

Patent

active

060841877

ABSTRACT:
A filter bypass switch for detecting a clogged or restricted flow condition in a filter such as an oil filter, the bypass switch including a housing having a passage extending therein, a plunger slidably positioned in the passage for movement therein, a wall in the housing closing the passage adjacent one end of the plunger, and a biasing member for urging the plunger to move in a predetermined direction relative to the housing wall. The present switch also includes a magnet attached or otherwise located on one end of the plunger for axial movement relative to the housing wall, and a reed switch having first and second relatively movable members located on the wall in axial alignment with the magnet, the first and second movable reed switch members being movable between open and closed circuit conditions when the magnet is moved by the plunger between positions that change the magnetic interaction between the magnet and the reed switch, the plunger being movable in the passage in response to the fluid pressure at the inlet of the filter.

REFERENCES:
patent: 3941958 (1976-03-01), Flesburg
patent: 3965317 (1976-06-01), Gratzmuller
patent: 4130745 (1978-12-01), Hetzer
patent: 4645887 (1987-02-01), Whiting
patent: 4752658 (1988-06-01), Mack
patent: 4792651 (1988-12-01), Whiting
patent: 5693926 (1997-12-01), Cassidy

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