Amf Gmbh

Siemens Electromechanical Components, Inc.

Potter & Brumfield, Inc.

Richard Allen Vernier

Thomas H Vaughn

An electromagnetic relay is provided having a base; a motor assembly mounted on the base, the motor assembly including a coil, a core and a frame; an armature pivotably mounted on the frame; a first electrical contact mounted to the base; a movable elongated member biased against the armature at least at two points such that movement of the armature is restricted and the armature is disposed toward an initial position spaced from the core; and a second electrical contact mounted to the movable elongated member and operatively associated with the first electrical contact.

Integral armature retention spring for electromagnetic relays

An electromagnetic relay to be used in applications such as DC motor reversing. The relay consists of two electromagnetic devices in a single enclosure with contacts configured in a so-called 'H-bridge' circuit. Each of the devices has a movable contact element, while both devices have a common pair of normally closed and normally open stationary contact elements. Both electromagnetic devices have coil bobbins which are preferably identical in shape and are locked together by means of the common stationary contact elements without a need of additional fastening means. In this manner, the number of parts is minimized and the amount of adjustment required is reduced.

Electromagnetic relay

An improved ground monitoring circuit for detecting the integrity and proper connection of the ground conductors in an electrical cable of an electrical power distribution system of a type that is commonly used at a surface mining site. A complete conductive loop is established between the ground conductor, or conductors, and the ground check, or pilot wire of the cable. A sensing signal at a frequency higher than the power frequency is coupled onto the ground monitoring loop. The monitoring loop includes a terminating resistor of predetermined value. The sensing signal on the ground conductor in the loop is isolated from local ground by means of an impedance element that presents a high impedance at the sensing signal but not at the power frequency. The impedance element is connected between the ground conductor of the power cable and the local ground. When successive lengths of cable are series connected, the impedance elements are connected in parallel with each other and are connected from an end of the ground conductor to the local earth ground, thereby to avoid series connections of the impedance elements in the ground conductors. The voltage and current in the loop are separately sampled. Various comparisons of the voltage and current samples are made to detect any deviation in the resistance of the loop. Any deviations from desired conditions in the loop produce an output signal that changes the condition of a trip relay. The trip relay initiates action that ultimately opens circuit breakers to remove power from the cable.

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Princeton, IN, United States of America

Richard Allen Vernier