US Patent 7267033 Ratchet wrench having two driving torques

A ratchet wrench includes a tubular member having an inner gear formed in a head, a rotor rotatably received in the head and having a compartment aligned with the inner gear for receiving a stronger latching device, two ratchet wheels rotatably received in the head, two weaker latching devices disposed in the rotor and each having a spring-biased pawl for engaging with the ratchet wheels and for controlling the driving direction of the rotor by the ratchet wheels. A drive shaft is rotatably received in the tubular member and includes a driving gear for engaging with the ratchet wheels and for controlling the driving direction of the rotor by the ratchet wheels.