GB988547A - Electro-magnetic relay - Google Patents

Abstract

988,547. Electromagnetic relays. INTERNATIONAL BUSINESS MACHINES CORPORATION. Aug. 3, 1962 [Aug. 11, 1961], No. 29858/62. Heading H2B. In an electromagnetic relay having an armature pivoted at one of its ends a movable contact is arranged substantially parallel to the armature and is movable about its ends remote from the armature pivot. As shown (Fig. 1) the electromagnet 10, 11 is adjustably mounted by screws 13 on a frame 12 and its armature 14 is arranged to pivot between one end of a limb of the core 11 and a shoulder 15 on the frame 12. An adjustable spring 16 biases the armature to the unattracted position shown so that an insulating actuator 26 engages an adjustable rubber stop 35. A plurality of contact members such as 20 are each supported at 24 in a conductive insert 25 and the limbs 22, 23 are biased apart to engage respective fixed contacts 28, 29. In the position shown, the actuator 26 holds the contact limb 22 away from the contact 28 and permits engagement of contacts 23, 29. On energization of the relay the armature is attracted to the core 11 and retained against an insulating shim 32. During the armature movement there is some lost motion between face 35 of the actuator 26 and the contact limb 23 which is subsequently moved away from contact 29 as limb 22 is permitted to engage contact 28. Members 25, 29, 28, 31 may form plug connectors. As shown in Fig. 2, the contact travel y can be set by the position of the actuator 26 relative to the pivot points 15, 24 without changing the armature travel x.