Patents by Inventor Chun Chou Lai

Chun Chou Lai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Ratchet wrench having two driving torques
    Patent number: 7267033
    Abstract: 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.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: September 11, 2007
    Inventor: Chun Chou Lai