Patent ID: 7946594

Claim:
A drill chuck locked through an inclined wedge surface, comprising: a drill body connected to a drive shaft of a power source at its rear end and having plural inclined holes arranged equally and circumferentially; plural jaws mounted in the plural corresponding inclined holes of the drill body respectively and having threads at its outer side surface; a nut fitted around the drill body and having threads at the inner surface so as to engage with the threads of the jaws; and an outer sleeve fitted around the drill body, a wedge block type lock ring fitted rotatably around the drill body and driving the nut to rotate, wherein a wedge block and an elastic member biasing the wedge block are pivotally connected therein and the wedge block has an inclined wedge surface locked frictionally with a locking surface of the drill body; a control sleeve connected with the outer sleeve and driving the wedge block type lock ring to rotate; and a poking claw, rotating synchronously with the control sleeve, between a first position where the poking claw is out of contact with the wedge block and a second positions where the poking claw is in contact with the wedge block; and wherein when the poking claw is in the first position, the inclined wedge surface closely contacts with the locking surface and when the poking claw is in the second position, the wedge block is dislocated and the inclined wedge surface comes out of contact with the locking surface.