Browse Prior Art Database

Magnetic Comparing Device

IP.com Disclosure Number: IPCOM000098898D
Original Publication Date: 1958-Oct-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Berhin, GM: AUTHOR

Abstract

The electromagnetic comparing device, which may be used to detect the absence of either one of two input pulses, includes magnetic circuitry comprising two outside yoke portions upon which are wound coils A and B. Positioned between the yoke members, which are joined at one end and form an air gap at the opposite end, is a flexible spring steel armature C upon which is wound a common return coil C. A signal on line A causes current to flow through coils A and C so as to make the right end of yoke A and armature C north poles. Similarly, a signal on line B causes current to flow through coils B and C, so as to make the right end of yoke B and armature C north poles.

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Magnetic Comparing Device

The electromagnetic comparing device, which may be used to detect the absence of either one of two input pulses, includes magnetic circuitry comprising two outside yoke portions upon which are wound coils A and B. Positioned between the yoke members, which are joined at one end and form an air gap at the opposite end, is a flexible spring steel armature C upon which is wound a common return coil C. A signal on line A causes current to flow through coils A and C so as to make the right end of yoke A and armature C north poles. Similarly, a signal on line B causes current to flow through coils B and C, so as to make the right end of yoke B and armature C north poles.

When both lines A and B are pulsed, the right ends of the two yokes and the armature all become north poles and there is no movement of the armature. If, however, only line B is pulsed, the right end of yoke A is not a north pole, and the north poles at the right ends of the armature C and the yoke B repel each other, causing the armature C to move upwardly to close two upper contacts. The right upper contact then completes a circuit through the armature to a contact A fail indicating circuit. The left upper contact completes a holding circuit to hold the indication after the signal is removed. If only line A is pulsed, the armature C moves downwardly and operates similar lower circuitry to indicate failure of line
B.

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