Patents by Inventor Otto L. Poon

Otto L. Poon 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).

  • Safety brake arrangement for elevators
    Patent number: 5230406
    Abstract: A safety brake arrangement for an elevator includes a brake for preventing relative movement of the elevator car and the elevator car guide rail, having a double wedge shape capable of preventing overspeeding in both the upward and downward directions and an activation mechanism responsive to overspeeding in both directions.
    Type: Grant
    Filed: February 6, 1992
    Date of Patent: July 27, 1993
    Inventor: Otto L. Poon
  • Lift
    Patent number: 4928796
    Abstract: A lift is provided with a detector for sensing when the brakes are engaged and the motor is disengaged. A tachometer detects movement of the lift, the lift slipping despite the engagement of the brakes, and causes the sensing means to activate a wire clamp, which clamps an endless wire. The stopping of the endless wire causes clamps within safety gears on the lift to grip guide rails alongside the lift and so stop the descent of the lift.
    Type: Grant
    Filed: June 15, 1988
    Date of Patent: May 29, 1990
    Inventor: Otto L. Poon