| 摘要 |
A chuck has a chuck body, an actuating element limitedly axially displaceable in the body, a first set of guide pistons axially fixed in the actuating element, angularly spaced about the axis, and each forming a guide passage extending at a small acute angle to the chuck axis, and a second set of guide pistons limitedly axially movable in the actuating element, angularly spaced about the axis, interleaved with the axially fixed guide pistons, and each forming a guide passage extending at a small acute angle to the chuck axis. Respective jaw bolts slidable in the passages each have an outer end projecting forward from the chuck body and a rear end axially coupled to the chuck body. The outer ends of the jaw bolts of the axially fixed pistons define a fixed-jaw circle centered on the chuck axis and the outer ends of the jaw bolts of the axially movable pistons define a movable-jaw circle centered on the axis. The movable pistons in the actuating element can be axially displaced to thereby radially displace the outer ends of the respective jaw bolts in the movable pistons independently of the jaw bolts of the axially fixed pistons between an outer position with the movable-jaw circle radially offset from the other circle and an inner position with the circles substantially congruent. The actuating element can be displaced axially in the chuck body to radially displace the outer ends of all of the jaw bolts.
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