Patent ID: 7267033
Filing Date: 2007-09-11
Classification: B25B

Abstract:
1. A ratchet wrench comprising: a tubular member including a head provided on one end thereof, a chamber formed in said head, and an inner gear provided in said head, said tubular member including a conduit formed therein and communicating with said chamber of said head, a rotor rotatably received in said chamber of said head and rotatably engaged in said inner gear, and including a compartment formed therein and aligned with said inner gear of said head, and including two channels formed therein, said rotor including a non-circular bore formed therein for slidably receiving a driving stem, said driving stem including a non-circular cross section for engaging with said non-circular bore of said rotor and for allowing said driving stem to be rotated by said rotor, said rotor including a space formed therein and communicating with said non-circular bore thereof for forming two inner peripheral shoulders in said rotor, said driving stem including a spring-biased projection engaged in said space of said rotor and engageable with said inner peripheral shoulders of said rotor for limiting said driving stem to slide relative to said rotor and for preventing said driving stem from being disengaged from said rotor, a first latching device disposed in said compartment of said rotor and including a spring-biased pawl having at least one tooth provided thereon for engaging with said inner gear of said head and for controlling a driving direction of said rotor by said head of said tubular member, two ratchet wheels rotatably received in said chamber of said head and each including a plurality of teeth formed thereon, two second latching devices disposed in said channels of said rotor respectively and each include a spring-biased pawl having at least one tooth provided thereon for engaging with said teeth of said ratchet wheels respectively and for controlling a driving direction of said rotor by said ratchet wheels respectively, and a drive shaft rotatably received in said conduit of said tubular member and including a driving gear provided on one end thereof for engaging with said teeth of said ratchet wheels respectively and for controlling the driving direction of said rotor by said ratchet wheels respectively.