| 摘要 |
1466507 Control of D.C. motors W BAIER W BAIER L SCHOBER and E SCHLUMPRECHT 30 Sept 1975 [19 Nov 1974] 39969/75 Heading H2J A drive circuit and actuating device as described and claimed in Specification 1,345,197, is improved by the provision of an additional contact 22 of the switch 13 which, in the open position of switch 13, connects one terminal of the impulse relay winding 12 to the lead between the impulse relay switch 14 and one side of the motor 6. Thus, if both switches 13, 14 should become open at the same time, due to the motor running past its stop position, the impulse relay winding 12 can still be energized via lead 21, motor winding, lead 18, lead 23, contact 22 and switch 13, to close switch 14. |
