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IP.com Disclosure Number: IPCOM000091692D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Jordan, CW: AUTHOR [+2]

Abstract

Magnetically actuated switch 10 has a pair of fixed magnets 11 and 12 spaced apart to provide a region for positioning relay device 13 having reed contact elements 14 and 15. Magnets 11 and 12 are of substantially equal strength and, when positioned as shown, buck each other out, producing zero longitudinal magnetic force components in elements 14 and 15. Relay 13 is positioned so that the contacts are longitudinally centered relative to magnets 11 and 12. Rotational positioning of relay 13 between magnets 11 and 12 is not critical.

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Switch

Magnetically actuated switch 10 has a pair of fixed magnets 11 and 12 spaced apart to provide a region for positioning relay device 13 having reed contact elements 14 and 15. Magnets 11 and 12 are of substantially equal strength and, when positioned as shown, buck each other out, producing zero longitudinal magnetic force components in elements 14 and 15. Relay 13 is positioned so that the contacts are longitudinally centered relative to magnets 11 and 12. Rotational positioning of relay 13 between magnets 11 and 12 is not critical.

To operate relay 13 from a normally open to a closed position, magnetic keeper 16 is brought into contact with the poles of one magnet 11 or 12. When contact is made, the magnetic flux of magnet 12 is unbalanced producing an increase in the longitudinal magnetic force through elements 14 and 15 causing a relay to close. By properly selecting the magnets according to their magnetic strength, operation of relay 13 from an open to a closed position can be controlled to the point that keeper 16 must actually make contact with the poles of one magnet. Mere proximity to magnet 12 would not produce such operation.

In an alternative arrangement, both magnets 11 and 12 can each have individual keepers 16. Switch actuation then occurs by removing one keeper to disturb the magnetic balance between magnets 11 and 12 causing the contacts to close.

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