| 摘要 |
A head portion ( 2 ) and handle portion ( 3 ) pivot about an axis pin ( 6 ). The head portion ( 2 ) is first biased in the required drive direction (D) bias being sustained by a resilient cam ( 5 ) being to one side of a clamping shoe ( 7 ) centre line ( 7 a). When torque is applied in the drive direction (D) to a levered end ( 3 a) of the handle portion the resultant force acts through the pertinent cam ( 3 c) on levered end ( 3 b) of the handle portion forcing the clamping shoe ( 7 ) inwards locking the inner surface ( 2 b) and clamping surface ( 7 c) onto the drive portion ( 4 ) of a socket ( 8 ) or circular drive ( 9 ) in order to operate a fastener ( 10 ). A spring cam ( 5 ) takes up any play between the handle portion ( 3 ) head portion ( 2 ) axis pin ( 6 ) clamping shoe ( 7 ) and drive portion ( 4 ) yet compresses sufficiently to allow the instant gearless drive ( 1 ) relative to the drive portion ( 4 ) to be repositioned (R). The clamping shoe ( 7 ) is a sliding fit within the shoe slot ( 2 c) can be conveniently operated against the resilient cam ( 5 ) by a release pin ( 11 ) within an appropriate slot ( 2 e).
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