| 摘要 |
A swivel chuck in which a body is rotatable about a first axis and has two bell cranks pivoted thereto about the second axes perpendicular to the first, shorter arms of the bell cranks being acted upon by a hydraulic member movable parallel to the first axis, to pivot the bell cranks, the longer arms of which carry at their free ends jaws which are rotatable about a third axis perpendicular to the first and second axes. Links pivoted to the jaws and the body form a parallelogram linkage to maintain the orientation of the jaws. Three pistons, movable in cylinders carried by the longer arms, have shoes connected thereto which abut rollers, arranged in pairs in grooves in an actuating member connected to each jaw, the rollers of a pair being at 180 DEG to one another, while the rollers in adjacent grooves are at 60 DEG to one another, with respect to the third axis. Movement of a selected one of the pistons will thus rotate the actuating member and associated jaw.
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