Patents by Inventor Jin-Shan Horng

Jin-Shan Horng 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).

  • Chain breakdown safety device for a power-driven roller door
    Patent number: 4704914
    Abstract: A chain breakdown safety device for a power driven roller door, having a movable elongate rod with a rack thereon driven by a spring control, an idler attached to the rod for engagement with the chain, the idler being structured in a manner such that it will withdraw its engagement with the chain once the chain breaks, to permit a spring to displace the movable rod, causing the rack thereon to turn a gear which is provided with a ratcheted pawl, which engages the chain sprocket on the roller door drive winch in order to stop the door from falling, thereby protecting bystanders or equipment from injury or damage resulting from the breaking of the chain.
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: November 10, 1987
    Inventor: Jin-Shan Horng