| 摘要 |
1,129,015. Two-position electric indicators. MINIATURE ELECTRONIC COMPONENTS CORP. 9 June, 1967 [15 June, 1966], No. 26838/67. Heading G4F. A two-position electric indicator comprises a semi-circular member 18 mounted for rotation about shaft 16, and carrying on its rear surface a pair of oppositely-directed bar permanent magnets 36, 38. The member 18 is caused to rotate to two alternative positions by means of an electromagnet comprising two soft iron cores 46, 48, each of which carries a pair of solenoids 50, 52 and 54, 56, respectively. The magnetic circuit is completed by an iron plate 64. Each of the polepieces is formed to a chisel shape, to provide flats 88, 90 against which the member 18 rests in either steady position; a cover-plate 40 of plastic material prevents sticking. The member 18 carries a pair of indications, e.g. differently coloured areas, which appear in mask 26 for viewing through window 8. In operation two solenoids on opposite cores are energized simultaneously, being connected in series, so as to repel the appropriate permanent magnet 36, 38 and rotate member 18 to its alternative position. |
