Patents by Inventor Richard E. Purkey

Richard E. Purkey 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).

  • Patent number: 4619437
    Abstract: Disclosed is a torque limiting valve handle having one more independently adjustable spring loaded balls urged in contact with depressions formed in the inside surface of a housing adapted for external manual engagement. The adjustment of the torque limit setting of the valve handle is protected from tampering or inadvertent modification by unauthorized personnel by the access to the adjustment requiring disassembly of the parts. One embodiment provides a torque lock in one direction of rotation. Another embodiment provides a torque limit override feature in either direction of rotation by an axial displacement of the housing of the handle with respect to an adaptor fixedly secured to the valve stem of the valve to which it is secured.
    Type: Grant
    Filed: January 29, 1986
    Date of Patent: October 28, 1986
    Inventors: William J. Williams, Richard E. Purkey