Spring clutch mechanism in screw driver

摘要

A spring clutch mechanism for transmitting a driving force of a driving part (4) to a driven part (5), including a first part (61), a second part (62), and a spring (63) disposed between the first part (61) and the second part (62). The first part (61) is connected to the driven part (5). The second part (62) is connected to the driving part (4) and is rotatable relative to the first part (61) coaxially therwith. The first part (61) has a first end (61c) provided with a frusto-conical portion having a first tapered surface, and the second part has a second end (62c) formed with a recess provided with a second tapered surface in contact with the first tapered surface, the first part (61) and the second part (62) are aligned linearly and coaxially in a state that the first end (61c) is inserted into the second end (62c) maintaining contact of the first tapered surface with the second tapered surface.