To provide a ratcheting screwdriver preventing excessive fatigue of a user and efficiently performing screwing.
The ratcheting screwdriver comprises: a working end with a handle and a reversible ratchet mechanism therein, and the ratchet mechanism defining a bore which receives one end of an associated shank coaxially therein. A cup-shaped spinner is fixed to the shank and a cup-shaped reversing member is nested in the spinner and is coupled to the ratchet mechanism and has an annular flange operable by a finger and/or thumb of a user's hand which is used for shifting the ratchet mechanism among forward ratcheting, reversing ratcheting and non-ratcheting modes. The outer peripheral surface of the annular flange has circumferentially alternating arcuate recesses and serrated frictional griping regions.
THOMPSON CHRISTOPHER D
Hajime Asamura
Yutaka Yoshida
Yukio Iwamoto