Browse Prior Art Database

Magnetic Object Sensor

IP.com Disclosure Number: IPCOM000096159D
Original Publication Date: 1963-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Conley, JL: AUTHOR [+4]

Abstract

This sensor produces a pulse on terminal 10 to mark the movement of each magnetic item, such as steel railroad car wheel 1, through region A of fixed path B. All magnetic items have substantially the same mass and composition. The sensor includes relay 2 which has normally open, magnetic reed contacts 2A and 2B disposed to pass flux from permanent magnet 3 in a first direction. Permanent magnet 3, lying between region A and the reeds of relay 2, has poles oriented to pass flux through the reeds of relay 2 in opposition to the flux contributed by magnet 3. The field strengths of magnets 3 and 4 and their relative spacing from the reeds of relay 2 are chosen to pass net flux through reeds 2A and 2B in the direction of flux contributed by magnet 3.

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Magnetic Object Sensor

This sensor produces a pulse on terminal 10 to mark the movement of each magnetic item, such as steel railroad car wheel 1, through region A of fixed path
B. All magnetic items have substantially the same mass and composition. The sensor includes relay 2 which has normally open, magnetic reed contacts 2A and 2B disposed to pass flux from permanent magnet 3 in a first direction. Permanent magnet 3, lying between region A and the reeds of relay 2, has poles oriented to pass flux through the reeds of relay 2 in opposition to the flux contributed by magnet 3. The field strengths of magnets 3 and 4 and their relative spacing from the reeds of relay 2 are chosen to pass net flux through reeds 2A and 2B in the direction of flux contributed by magnet 3. This through the reeds of relay 2 in opposition to the flux contributed by magnet 3. The field strengths of magnets 3 and 4 and their relative spacing from the reeds of relay 2 are chosen to pass net flux through reeds 2A and 2B in the direction of flux contributed by magnet 3. This net flux is insufficient in the absence of an external influence to pull the reeds from their normal, open condition into contact with each other. It is sufficient, in the absence of an external influence, to maintain the reeds in contact once such contact is established.

With relay 2 in normal condition, movement of wheel 1 into region A shunts magnet 4. This allows the net flux through reeds 2A and 2B to rise to the po...