| 摘要 |
A selective rotation arrangement for a shaft, the arrangement including a housing mountable spaced from the shaft and an engagement member with distal and proximal ends which is selectively movable relative to the housing towards or away from the shaft between an operating position towards the shaft and a rest position clear of the shaft, the engagement member having a gear member at the distal end thereof which is engageable with the shaft in the operating position to permit turning of the shaft by the engagement member, but is disengaged from the shaft in the rest position.
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