Potter & Brumfield, Inc.

Amf Gmbh

Richard E Bell

A compact electromagnetic relay of the type having an insulative base (1) adapted to receive an electromagnetic assembly (2, 3, 4) on one side of its partition wall (15) and a contact assembly (6) on the other side includes especially adapted armature (3) and pusher (5). The armature has one leg (32) that is bifurcated to form a slotted opening (324) communicating with a socket (323). The shaft region (55) of the pusher has two cross-sectional dimensions of different size. One dimension d1 allows the slotted opening to freely pass over it while the other dimension d2 prevents the socket from disengaging with the pusher when the armature is rotated to assume its working position.

Electromagnetic relay including a rotatable armature mount

An electromagnetic relay of the type having an insulative base (1) which supports an electromagnetic assembly (2, 3) and a contact assembly (6) separated by partition walls (14, 15) includes a multipurpose retaining spring (4). The retaining spring is adapted to mate with the longitudinal portion (24) of the magnetic yoke and includes a plurality of tabs (411, 412 and 413) that dig into the insulative base securing it and the magnetic yoke into position. The retaining spring includes a flexible extension (43) located near a free end (243) of the magnetic yoke. An armature (3) is pivotally mounted on the free end and retained into position by the flexible extension of the retaining spring.

Electromagnetic relay having a multifunction retaining spring

A method of assembling electromagnetic relays by securing and aligning the magnetic pole pieces in the base of the relay through the use of ultrasonic reformation of the base material.

Method of manufacturing relays

A method and apparatus for attaching leads to the movable armature assembly of a relay or to other movable elements. The apparatus includes a rigid, nonconductive carrier member (41) mounted to the armature of the relay and provided with a plurality of grooves (51) on one end for receipt of the leads (56). The opposite end of the carrier is adapted to receive and support the movable contact arms (59) such that the arms will intersect the grooves. The conductive cover is trimmed away from the ends of the leads to expose the wires which may be welded or otherwise attached to the contact arms. The leads are also firmly attached to the carrier farther back along the leads where the conductive cover remains intact. In operation, as the armature assembly moves up and down during the operation of the relay, the exposed lead wires will be prevented from bending back and forth by the surrounding carrier. Instead, the bending forces will be shifted back along the leads to where they are attached to the carrier; and since the lead covers are still intact at that location, the leads will be better able to withstand the bending forces. The carrier is preferably formed of an insulating thermoplastic material to permit the carrier to be attached to the armature and the leads to the carrier quickly and reliably by utilizing an ultrasonic tool to soften and reform the carrier material at the proper locations. The relay is enclosed within a plastic housing provided with a pair of stop portions to help maintain the armature and the carrier member mounted thereon in position on the relay.

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Princeton, IN, United States of America

Richard E Bell