| 摘要 |
<p>An electrically-operable actuator (10), for use in locking and unlocking a latch mechanism in a motor vehicle by the selective operation of a switchable direct current electrical Jsupply to said actuator, comprises a housing (12, 14) enclosing a reversible direct current electric motor (16, 24) adapted to be coupled to said electrical supply, a reduction geartrain, a reciprocable member (96) movable between two predefined limits and adapted at one end to be coupled with a locking lever of said latch mechanism, and a rotary, load-sensitive releasable coupling (64) provided between said reversible electric motor (16, 24) and said reciprocable member (96), the actuator including a releasably-engagable locking lever (132) which is operable to lock said reciprocable member (96) against any movement relative to said housing (12, 14), said locking lever (132) being applied, when the actuator (10) is coupled to said switchable electrical supply and after one of said predetermined limits has been reached, by the operation of a switch means in said supply to provide an electrical pulse to said electric motor (16, 24) at a predetermined voltage, lower than the normal operating voltage of said electric motor (16, 24) for a short predetermined period of time.</p> |
