| 摘要 |
A quickly-releaseable clutch (40), comprises a linearly-moveable member (32) with an external spiral thread (34) engageable by a ball (58) in an opening in an inner sleeve (54) secured to a rotatable member (38), the ball coupling the members (32, 38) when it is forced to engage the thread (34) by a small bore part (60a) of an axially moveable outer sleeve (60) which also has a larger bore part (60b) allowing the ball to disengage from the thread. The sleeve (60) may be moved against a spring (62) to its clutch-release position either manually by gripping its knurled outer surface, or by a collar (64) adjustably mounted on the member (32).
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