| 摘要 |
An improved manually tightened chuck, having a hollow chuck body member, provided with three inclined bores along periphery with same interval in chuck body member. A jaw is installed in each inclined bore slidably. A nut is sheathed in the middle of chuck body member, and the nut is interconnected with each jaw through threads. A front sleeve is provided at the front end of the chuck body member, and a rear sleeve is provided at the rear end. The nut is of duplex-half type structure, on its peripheral surface a nut sleeve is sheathed, between the nut sleeve and the nut is of stationary fit, between the front sleeve and the nut sleeve a torque transmission structure is provided, the front end of rear sleeve and the rear end of front sleeve is provided with inter fitted chucking hook, by means of the chucking hook the rear sleeve and the front sleeve are connected with each other. The installation of both front and rear sleeves of the chuck is more convenient, and both front and rear sleeve are more stable after installation, during operation of the chuck no radial swing of both front and rear sleeves is created.
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