Chain-lock actuated magnetic switch

Details Chain-lock actuated magnetic switch Chain-lock actuated magnetic switch

1979-09-24

1981-10-27

Moore, Richard E.

Closure fasteners

Extension link

Chain

E05C 1736, E05C 1310

Patent

active

042969573

ABSTRACT:
A normally open reed switch mounted on a door jamb is closed by a magnet in a chain-lock keeper when the door is closed. A pole piece, which functions as a bolt on the end of the chain, engages in the keeper and shunts the flux of the permanent magnet so that the reed switch is not effected by the flux, and assumes its normally open condition if the bolt is seated home in the keeper.

REFERENCES:
patent: 1987913 (1935-01-01), Schulz
patent: 3087751 (1963-04-01), Nisenbaum
patent: 3426166 (1969-02-01), Canceill

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