Bevel gear 5 is inserted into the chuck through a slot in ring 1 and is located on the addendum cone in ring 2. When piston 3 is moved to the left by fluid entering the right end of its cylinder, ring 2, linked rigidly to piston 3 through rod 4, clamps bevel gear 5 against ring 1. Gear 5 is released when piston 3 is moved to the right by spring 6.
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