| 摘要 |
1,185,705. Retarding action of switches. L. TROXLER. 6 March, 1967 [5 March, 1966], No. 10404/67. Heading H1N. Operation of a latching push button closes a microswitch and engages a clutch to a time drive which after a preset interval releases the latch to open the switch and disengage the clutch to allow the mechanism to return in readiness for subsequent operation without resetting. A frictionally restrained setting knob (8, Figs. 1 and 3, not shown) is rotatable between 180-degree limits to predetermine a time interval and directly moves a coaxial limiting member 22 carrying an integral abutment 25. A member 24 having an actuating nose 27 and an internal abutment 24a is carried on a loose shaft 16b and is coupled to member 22 by a spring 26 such that abutment 24a is normally held against abutment 25. Depression of the end of a lever (9, Figs. 1 to 4, not shown) urges a pin 6 axially inwards against a lever (5) which actuates a microswitch (3) and clutches shaft 16b to a drive from a geared synchronous motor (1, Fig. 3, not shown). Pin 6 is latched in this position by a shoulder 21 thereon engaging behind a spring-urged lever 19, until the drive to shaft 16b has rotated nose 27 to engage the extension 28 and thereby disengage lever 19 from shoulder 21. The pin 6 is thus released, the microswitch opens and the clutch to shaft 16b is disengaged, whereupon spring 26 returns abutment 24a to its starting position (preset by abutment 25) in readiness for another operation without resetting abutment 25 unless it is desired to change the time delay interval.
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