| 摘要 |
1,198,493. Polarized electromagnetic relays. P. E. UGON. 1 Nov., 1967 [4 Nov., 1966; 27 Sept., 1967], No. 49691/67. Heading H1N. A polarized "free armature" electromagnetic relay has insulated stop contacts and/or the armature provided with electrically conductive non-magnetic layers to limit armature "sticking." In Fig. 1 ferrite permanent magnets 20, 22 have conductive polepieces 24, 26 and 28, 30 each with a respective conductor 36, 38, 40, 42 and a silver or other contact metal facing 34 which co-operates with the iron armature 50. The armature has a similar metal facing 52 and is moved to bridge either poles 24, 26 or 28, 30 on energization of a coil 44 surrounding the armature cavity 32. Metal permanent magnets with electrical insulators at their ends may replace the ferrite magnets (Fig. 3, not shown). The permanent magnets may be mounted inside the coil (Fig. 4, not shown) or alongside the coil (Fig. 5) with the enclosing can acting as part of the magnetic circuit on which stop contacts 72 are mounted so that the armature 50 has a substantially rocking motion. One of the permanent magnets may be replaced by a ferromagnetic non-retentive member to provide a monostable relay or if both are non-retentive the armature is a permanent magnet (Figs. 7 and 8, not shown). |
