Patent ID: 8740227

Claim:
A drill chuck, characterized in comprising, a chuck body ( 11 ), comprising therein multiple equally distributed slanting holes along the circumference; multiple jaws ( 13 ), slideably provided within the slanting holes of the chuck body ( 11 ), and having threads at a rear end; a split-body nut ( 12 ), rotatably provided around the chuck body ( 11 ) and joining the threads of the jaws ( 13 ); and a nut sleeve ( 2 ), closely put around the split-body nut ( 12 ); characterized in further comprising: a connecting sleeve ( 04 ), rotatably mounted within a connecting hole ( 111 ) of the chuck body ( 11 ) and connected with a driving shaft of a power machine; a self-locking mechanism, comprising: a clutch tooth sleeve ( 10 , 10 ″), fixedly connected with the chuck body ( 11 ) of the drill chuck, and provided with teeth ( 101 ); an oval deformation ring ( 09 , 09 ″), having a substantially circular first shape and a substantially oval second shape, wherein the oval deformation ring ( 09 , 09 ″) has teeth ( 091 ) on side wall, with the teeth ( 091 ) of the oval deformation ring ( 09 , 09 ″) engaging with the teeth ( 101 ) of the clutch teeth sleeve ( 10 , 10 ″) when the oval deformation ring ( 09 , 09 ″) is in the second shape; and a control sleeve ( 08 ), for controlling the conversion of the oval deformation sleeve ( 09 , 09 ″) between the first shape and the second shape, wherein the clutch tooth sleeve ( 10 ″) of the self-locking mechanism is formed with a handling portion at an outer surface, and the control sleeve ( 08 ) includes a handling portion ( 84 ) between the clutch tooth sleeve ( 10 ″) and the connecting sleeve ( 04 ); and an intermediate sleeve ( 05 ), rotating synchronously with the connecting sleeve ( 04 ) and connected fixedly with a rear portion of the oval deformation ring ( 09 ″).