Patent ID: 6912934

Claim:
A ratchet screwdriver having a body having a handle with a proximal end and a distal end, a shank with a proximal end and a distal end, the proximal end of the shank connected to the distal end of the handle, a post with a proximal end, a distal end and a non-circular periphery, the proximal end pivoted with the shank, and a head with a periphery and integrally formed on the distal end of the post, and a driving portion mounted on the body and having a cylinder mounted around the post and having a non-circular inner periphery and shaped as the non-circular periphery of the post, and a proximal end surface and a distal end surface and each end surface respectively having multiple teeth, each tooth having a vertical surface and an inclined surface, the inclined surface of each tooth on the proximal end surface extending in a direction same as that of the inclined surface of tooth on the distal end surface, and a spring with two ends and mounted on the post, one end of the spring abutted with the proximal end of the post and the other end of the spring abutted with one of the end surfaces of the cylinder, and a chuck mounted around the head and having a distal end, a proximal end, a holding hole defined through the distal end of the chuck, a mounting hole defined through the proximal end of the chuck and communicating with the holding hole, a proximal end surface, and multiple tooth-like protrusions formed on the proximal end surface and selectively engaged with the teeth on one of the end surfaces of the cylinder.