Ratchet spanner

Application Number: 00108654
Application Date: 2000.05.08
Publication Number: 1273901
Publication Date: 2000.11.22
Priority Information: 1999/5/17 JP 135567/99; 1999/9/16 JP 262551/99
International: B25B13/46
Applicant(s) Name: K-R Industrial Co., Ltd.
Inventor(s) Name: Kabeya Sho;Iriya Toshiro
Patent Agency Code: 31100
Patent Agent: hou jiayou
Abstract A ratchet wrench is designed to prevent overshooting and unintended switching of drive direction. The ratchet wrench has a wing member 44, which is biased by a spring 58 through a bushing pin 56, wherein an elastic member 66 formed of an elastic material, such as rubber, is incorporated into an axial internal space of the spring 58. Thereby, it is possible to strengthen a pressing force in a direction of holding engagement between a pawl 46 of the wing member 44 and an internal gear 30 of an oscillating member 26. Thereby, in a direction tending to release the engagement between the pawl 46 of the wing member 44 and the internal gear 30, the elastic member functions as a stopper to prevent overshooting. Further, since the force holding a switching member 52 to a shank 36 is increased, it is possible to prevent an unintended switching of the drive direction.