Patent ID: 8408104

Claim:
A screwdriver including: a handle; a shaft partially inserted in the handle; a torque-transmitting unit arranged between the handle and the shaft and operable to transmit an adjustable maximum value of torque to the shaft from the handle, wherein the torque-transmitting unit includes: a driver placed movably but non-rotationally in the handle, wherein the shaft is inserted rotationally through the driver; a follower placed rotationally in the handle, wherein the shaft is inserted non-rotationally through the follower; and a spring; and a torque-adjusting unit partially located in the handle, connected to the torque-transmitting unit, and operable to adjust the adjustable maximum value of torque, wherein the torque-adjusting unit includes: a screw placed rotationally and movably in the handle, wherein the spring is compressed between the screw and the driver to bring the driver into releasable engagement with the follower, wherein the shaft is rotationally inserted through the screw; and a nut placed non-rotationally and non-movably in the handle and engaged with the screw.