Patents by Inventor Robert M. Kissick

Robert M. Kissick 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: 5938183
    Abstract: In a hydraulic winch having a clutch assembly for freeing a drum of the winch for free falling rotation, a control system is provided for controlling operation of the clutch assembly. The supply system includes a directional control valve shiftable between a first position in which fluid is supplied to the clutch assembly at a first pressure which maintains the clutch in the disengaged position to allow free fall of the drum, and a second position in which fluid is supplied to the clutch assembly at a second pressure which allows the clutch to return to the engaged position, braking free fall of the drum. A timing element shifts the directional control valve to the second position after fluid has been supplied to the clutch assembly at the first pressure for a predetermined length of time.
    Type: Grant
    Filed: August 4, 1998
    Date of Patent: August 17, 1999
    Assignee: Hydraulic Power Systems, Inc.
    Inventor: Robert M. Kissick