Browse Prior Art Database

Comparing Device

IP.com Disclosure Number: IPCOM000097795D
Original Publication Date: 1961-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 41K

Publishing Venue

IBM

Related People

Hastings, KE: AUTHOR

Abstract

Comparing unit 10 consists of switches 11 and 12 and energizing coils 13 and 14. Switch 11 has contact springs 15 and 16 extending into and projecting from a sealed glass protective vessel 17. A similar vessel 18 encloses a portion of contact springs 19 and 20 of switch 12. Springs 15 and 19, being of ferrous material, are permeated by flux from a permanent magnet 22. This is positioned between them with the south and north poles facing 15 and 19, respectively. A similar magnet 23 of approximately half the strength of 22 is positioned between springs 16 and 20 so that the south and north poles are facing the same, respectively.

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Comparing Device

Comparing unit 10 consists of switches 11 and 12 and energizing coils 13 and 14. Switch 11 has contact springs 15 and 16 extending into and projecting from a sealed glass protective vessel 17. A similar vessel 18 encloses a portion of contact springs 19 and 20 of switch 12. Springs 15 and 19, being of ferrous material, are permeated by flux from a permanent magnet 22. This is positioned between them with the south and north poles facing 15 and 19, respectively. A similar magnet 23 of approximately half the strength of 22 is positioned between springs 16 and 20 so that the south and north poles are facing the same, respectively.

Energizing coils 13 and 14 are each completely wound about the vessels 17 and 18. Coil 13 is connected between a common terminal 24 and an input terminal 25. Coil 13 is wound so that when a current is applied to input 25, a north pole is at the upper end of unit 10 and a south magnetic pole is at the lower end. Coil 14 is connected between terminal 24 and an input terminal 26. When a current is applied to 26, a north pole is developed at the lower end of unit 10 and a south magnetic pole is at the upper end. The magnetic fields developed, when a current is applied to either input 25 or 26, are of less strength than that produced by magnet 22, but greater than the magnetic field produced by magnet
23.

Hence, if currents are simultaneously applied to inputs 25 and 26, the magnetic fields developed cancel each other and there is no closing of the normally open contacts 15 and 16, 19 and 20. if a current is applied to input 25 only, contacts 15 and 16 close; contacts 19 and 20 remain open. This is because the magnetic field developed by the applied current causes contact 16 to be polarized with a north pole at its contact end. Contact 15 has a strengthened south pole due to the magnetic field developed by the applied current. Consequently, contacts 15 and 16 come together due to the force of attract...