Electricity: magnetically operated switches – magnets – and electr – Permanent magnet-actuated switches
Patent
1993-06-25
1994-03-08
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Permanent magnet-actuated switches
335207, 335151, H01H 900
Patent
active
052935230
ABSTRACT:
Assembly for unidirectional magnetic proximity detecting wherein a magnet is used in conjunction with a permeable plate for absorbing magnetic flux and a reed type switch. The switch contacts remain open due to the absorption of the magnetic flux away from the contacts and into the permeable plate. Proximation of a permeable target object near the magnet enhances the magnetic flux creating an opposite magnetic flux across the switch contacts; thus, actuating the switch closed. Proximation of the permeable target object is only effective in actuating the switch when it approaches the sensing area defined adjacent to the magnet portion opposite the permeable plate. A preferred apparatus includes an enclosure which provides a weatherproof environment for the detector assembly.
REFERENCES:
patent: 3993885 (1976-11-01), Kominami et al.
patent: 4038620 (1977-07-01), Shlesinger, Jr. et al.
patent: 5128641 (1992-07-01), Posey
Exhibit A-Hermetic Switch, Inc. invoice dated Mar. 26, 1993, for distribution of samples described and claimed in the present application.
Exhibit B-Hermetic Switch, Inc. price quotation, dated Apr. 22, 1993, for products described and claimed in the present application.
Donovan Lincoln
Hermetic Switch, Inc.
Roddy Craig W.
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