Electrical safety switch

Details Electrical safety switch Electrical safety switch

1995-12-05

1997-12-30

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Permanent magnet-actuated switches

200 83R, 218 57, H01H 900

Patent

active

057035520

ABSTRACT:
For protecting the pump of a carpet cleaner, the cut-out terminals 16, 15 are commanded by the pressure of fluid in passage 11, 12, 13 which communicates with volume 22 having as an upper wall a flexible diaphragm 24. A fluid tight and electrically insulating housing 9 has a fixed boss portion 19 which is surrounded by a mobile annular permanent magnet 25 carried by diaphragm 24 and which guides a central mobile permanent magnet 20 which drives a mobile contact 18 up or down, closing or opening terminals 15, 16. High pressure at 11 drives diaphragm 24 and magnet 25 upwards, which attracts magnet 20 upwards, and connects terminals 15, 16 via mobile contact 18.

REFERENCES:
patent: 5144102 (1992-09-01), Buse
patent: 5308939 (1994-05-01), Sasaki
patent: 5425396 (1995-06-01), Wodeslavsky
patent: 5514844 (1996-05-01), Hamano et al.

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