Patent ID: 6899342

Claim:
An improved manually tightened chuck, comprising: a hollow chuck body member; three inclined bores along periphery, provided with same interval in said chuck body member; three jaws, slidably installed in each inclined bore respectively; a nut, provided in the middle of said chuck body member, said nut interconnected with each said jaw through threads; a front sleeve provided at the front end of said chuck body member; a rear sleeve sheathed at the rear end of said chuck body member; a nut sleeve sheathed on peripheral surface of said nut, said nut being of duplex-half structure and said nut sleeve and said nut having a tight fit; between said front sleeve and said nut sleeve a torque transmission structure being provided; and an inter fitted chucking hook disposed at the front end of said rear sleeve and said the rear end of said front sleeve, whereby said rear sleeve and said front sleeve are connected with each other.