| 摘要 |
In a chuck for the rotary machining of workpieces (15), having a hollow shaft possessing a hollow shaft axis and jaws (13) which can be turned about axially parallel pivot pins (12) and which are configured as two-armed levers whose one end (13b) can be applied with gripping surfaces (13c) to the workpieces (15) and whose other end (13a) can be turned about the pivot pins (12) by means of a driven ring gear (8) coaxial with the hollow shaft axis (A-A), which can be rotated to a limited extent about the latter, a braking device (22) is associated with the hollow shaft (9). In order to reduce construction costs and permit a uniform increase of force by the operating thrust in both directions of rotation, the jaws (13) are in mirror-image symmetry with their own planes of symmetry running through the axes of the pivot pins (12), and furthermore, the jaws (13) can be swung to both sides according to the direction of rotation of the ring gear (8), with respect to a radial line passing through these axes. The chuck can be designed both for the outside and the inside mounting of workpieces.
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