Patent ID: 7237621

Claim:
A driving device comprising: a pneumatic head ( 1 ) connected to a pneumatic tool; the pneumatic head ( 1 ) being driven by the pneumatic tool to push forwards reciprocally; a front end of the pneumatic head ( 1 ) being installed with a push rod ( 11 ); a driving unit ( 2 ) having a large upper ring ( 23 ) and a slender driving rod ( 21 ) at a front end thereof; a center of the upper ring 23 having a recess for receiving the push rod ( 11 ); the push rod ( 11 ) serving to push the driving unit ( 2 ); a front end of the driving rod ( 21 ) having an oblique top surface ( 22 ); a round cylindrical casing ( 3 ) having a receiving space ( 31 ); an inner diameter of an upper end of the receiving space ( 31 ) being greater than that of a lower end of a teeth portion ( 42 ); the upper end and a lower end of the receiving space ( 31 ) being formed as a stepped structure; the upper end being formed as a smaller straight round inner cylinder and the lower end being formed as a greater straight round inner cylinder; the driving unit ( 2 ) being received in the upper end of the receiving space ( 31 ); a lower side of the receiving space ( 31 ) having an annular recess ( 32 ) near a bottom end of the receiving space ( 31 ); a rotating unit ( 4 ) having an engaging portion ( 41 ) at a lower end thereof; the rotating unit ( 4 ) being received in the lower end of the receiving space ( 31 ); the engaging portion ( 41 ) serving to combine with a sleeve or other screwing means; an upper side of the rotating unit ( 4 ) having a teeth portion ( 42 ); a plurality of teeth of the teeth portion ( 42 ) being annularly arranged around the upper side of the rotating unit ( 4 ); the configuration of the teeth portion ( 42 ) being corresponding to an oblique end surface ( 22 ) of the driving unit ( 2 ); when the teeth portion ( 42 ) of the rotating unit ( 4 ) resists against the oblique end surface ( 22 ) of the driving rod ( 21 ), the rotating unit ( 4 ) having a rotating force for driving the engaging portion ( 41 ) and the sleeve or screwing moans thereon; a spring ( 51 ) enclosing a middle part of a driving unit ( 2 ); wherein the pneumatic head ( 1 ), the upper ring ( 23 ) of the driving unit ( 2 ), the casing ( 3 ), an upper end of the rotating unit ( 4 ) and the spring ( 5 ) are coaxial round cylinders; and wherein in assembly, the rotating unit ( 4 ) being installed into a lower end of the receiving space ( 31 ) of the casing ( 3 ), the spring ( 51 ) being installed into the upper end of the receiving space ( 31 ), the driving unit ( 2 ) being placed into the receiving space ( 31 ) so that the driving unit ( 2 ) resists against the spring ( 51 ) and when no force being applied to the driving unit ( 2 ) the driving unit ( 2 ) will be pushed back to an upper place of the upper end of the receiving space ( 31 ).