Patent Number: 6,253,645

Title: Ratchet screw driver

Abstract: A ratchet screw driver includes a shaft rotatably received in a handle, two follower ratchet gears slidably engaged on and rotated with the shaft, two driving ratchet gears rotatably and slidably engaged on the shaft, and a spring biasing the driving ratchet gears to engage with the follower ratchet gears. A barrel and a ferrule are secured together and rotatably secured to the handle and each has an actuating surface for selectively disengaging the driving ratchet gears from the follower ratchet gears to control the driving direction of the shaft.

Inventors: Lin; Ching Chou (Taichung Hsien, TW)


International Classification: B25B 13/00 (20060101); B25B 15/04 (20060101); B25B 13/46 (20060101); B25B 15/00 (20060101); B25B 013/00 ()

Expiration Date: 07/03/2018