Dual threshold magnetic proximity switch

Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Vacuum or hermetically sealed type

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Details

335179, 335207, H01H 5122

Patent

active

039769623

ABSTRACT:
An improved dual threshold switch is actuated by magnetic fields in the sch's proximity. An elongate glass envelope contains a pair of reed contacts. The contacts are biased by a piece of donut-shaped magnetic material circumscribing the envelope to be switched to a closed position at one magnetic threshold or an open position at another magnetic threshold. Both magnetic thresholds are induced in the contacts by external actuating magnets and the thresholds can be changed by physically moving the donut along the elongate glass envelope. A coil is provided and encompasses the envelope and magnetic donut to provide an electro-magnetic field which shifts the biasing field induced by the donut. When the electro-magnetic shifting field is turned on the thresholds established by the biasing field are shifted so that the contacts would be actuated from external actuation fields at different magnetic thresholds. This feature gives flexibility since various combinations of weak or strong external magnetic fields can be employed as the situation demands without sacrificing reliability or calling for extensive modifications of the switch. A delay circuit energizes or initiates the coil to provide the electromagnetic shifting field upon the occurrence of a variety of conditions such as the passage of time, the changing of the tide, the proximity or absence of external electric, gravitational or magnetic fields, for example.

REFERENCES:
patent: 3707690 (1972-12-01), Sakatos
patent: 3906476 (1975-09-01), Yonezu

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