Coated magnetically biased reed switch

Details Coated magnetically biased reed switch Coated magnetically biased reed switch

1975-04-25

1976-06-29

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Vacuum or hermetically sealed type

335153, H01H 166

Patent

active

039672247

ABSTRACT:
A small reed switch having a glass tubularly shaped envelope containing a ir of reed contacts is modified to ensure its being biased to either an open or a closed position. A donut-shaped piece of a rubber-bonded, barium-ferrite, magnetic material is circumferentially mounted on the reed switch at a position where its magnetic field influences the contacts to an open position or a closed position. Thusly arranged, an actuating magnet, having a sufficient field at a single pre-established distance from the contacts, actuates the switch from all radial directions from the switch. Potting the modified switch in an epoxy resin further ensures a greater reliability and makes it ideal for implantations in laboratory animals.

REFERENCES:
patent: 3382468 (1968-05-01), Mattes
patent: 3707690 (1972-12-01), Sakatos

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