General Time Corporation

Minelco Gmbh

Robert D Hart

Robert Mazzamauro

John J Ambrozaitis

An electromagnetic indicator capable of binary indication including a rotatably mounted semicircular flag assembly which can rotate between a first position ('set') and a second position ('fault') upon the receipt by the indicator of an electrical signal. A portion of the flag assembly is permanently magnetized and is magnetically latched in either the 'set' or 'fault' position by a magnetic latch which is preferably comprised of a bracket and core bar. The bracket has two ends which are positioned so that they are adjacent the magnetized portion of the flag assembly. The core bar is magnetically connected to an electromagnet and is also positioned adjacent a magnetized portion of the flag assembly. When the electromagnet is connected to the appropriate terminal of an electrical power source, the electromagnet generates a magnetic field, magnetizes the two ends of the bracket means and the core bar, and causes the flag assembly to flip from the 'set' position to the 'fault' position, or vice versa. After the electromagnet is disconnected from source, the flag assembly is magnetically latched in either the 'set' or 'fault' position by the magnetic attraction between the bracket, and the core bar on the one hand and the magnetized portion of the flag assembly on the other hand.

Electromagnetic flip-type visual indicator

An indicator for monitoring a channel fault is located in each channel of a multichannel system. An interface is located between each indicator and channel being monitored to assure a response of the indicator under circumstances that a fault signal in the channel could not have otherwise activated the indicator.

Multi-channel fault monitor using quick-acting interfaces to operate

An indicator flag is movable alternately into one of a plurality of display positions thereby to provide a distinguishable visual indication in each position. The indicator flag carried by a movable assembly is actuated by electromagnetic means and the movable assembly is latched in each display position. A pair of switches are associated with and controlled by the movable assembly from a normally closed to an open condition. The switches may function variously to control associated equipment or switch the electromagnetic means so that drive energy is required only during transition of the indicator flag from one of the plurality of display positions to another, among others.

Electromagnetic indicator

A binary indicator including a pair of indicator discs mounted along a common axis has means for damping rotational movement of a resetting structure in one direction following movement imparted to the resetting structure in the other direction for purposes of resetting the relative positions of the indicator discs to their relative positions prior to their relative relocation occasioned by a fault or malfunction condition. One indicator disc undergoes movement, the movement in both directions being induced magnetically. And, movement of the resetting structure in the other rotational direction is against the forces of rotational elasticity of spring means. A force for damping rotational movement of the resetting structure in the one rotational direction is developed by viscous-shear frictional engagement between a pair of friction discs biased into juxtaposition with a viscous film therebetween by the spring means under compression.

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Collinsville, CT, United States of America

Robert D Hart