| 摘要 |
296,009. Forkardt, P. Aug. 22, 1927, [Convention date]. Chucks. - In a selfcentring chuck wherein the jaws are actuated by bell-crank levers, the pivots of the levers are mounted in housings which can be pushed radially out of the chuck without dismantling the latter. Such adjustment may be for the purpose of changing the jaws or for varying the range of the chuck. The chuck body a has radially sliding jaws b provided with recesses e engaged by two teeth on bell-crank levers c. Gripping is effected by axial displacement of a plunger f, preferably by means of a pneumatic piston. The pivots d of the levers are mounted in housings g which are radially adjustable in the, body a by rotation of a ring h, the ring being provided with a continuous spiral cam k engaging teeth on the housings or by separate cam slots or projections engaging teeth or recesses respectively in the housings. |
