GB1363811A - Relays - Google Patents

Abstract

1363811 Electromagnetic relays CUTLERHAMMER INTERNATIONAL FINANCE Inc 23 June 1972 [23 June 1971] 29501/72 Heading H1N An electromagnetic relay having a pivoted armature 34 biased to one position by a permanent magnet PM is provided with fixed contacts 4a, 6a on one side of an insulating support 2 and connected to terminals 4, 6 on the other side of the support and movable contacts 22 mounted between an insulating spring support 36 and an overlying insulating contact support member 40, springs 38 for each movable contact 22 being compressed to bias the contacts 22 against the contact support 40 and thereby reduce contact bounce when the supports 36, 40 are secured to the armature 34 as by screws 42. The relay is basically the same as that disclosed in Specification 1,363,812 and is provided with an auxiliary contact set forming the subject of the invention claimed therein, extensions 40f of the contact support carrying the auxiliary movable contact. The armature 34 is located by studs entering holes 34a therein for pivotal movement on a coil retaining plate 32. Non- magnetic shims in slots 34b of armature 34 prevent sticking. The movable contacts 22 have ears 22a to which bars 40a, 40d of the contact support 40 impart a hammer blow to break welds. Conductive straps secure the movable contacts 22 to terminals 8 in support 2. Fixed contacts 4a, 6a have threaded shanks adjustably mounted in tapped bores of the terminals 4, 6. One set of fixed contacts, e.g. 4a, and their terminals 4 may be omitted to provide either a normally open or normally closed contact arrangement (Figs. 5-8, not shown). Insulating bosses depend from support 2 in the position of contacts 4a to co-operate with the non-contactcarrying ends of the movable contacts, which are identical to those disclosed in the aforementioned copending Specification, when the contacts are normally open.