Patents by Inventor Ronald L. Sisson

Ronald L. Sisson 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).

  • Clutches with bypass inching valve
    Patent number: 4006805
    Abstract: A transmission control apparatus for a vehicle having a transmission with fluid actuated clutch means and hydraulic brake means wherein a first fluid conduit, having a fluid flow constricting means interposed therein, connects a fluid pressure source with the clutch means, with an inching valve means being fluidically connected in parallel with the first conduit by second and third conduits upstream and downstream respectively, from the fluid flow constricting means, for regulating the pressure of the pressure fluid supplied to the clutch means, with the inching valve means also being operatively connected with the brake means and responsive to the degree of actuation of the brake means and actuatable between a first and a second position, whereby in the first position, the pressure fluid can freely flow into, through and out of the inching valve toward the clutch means so as to effectively bypass the fluid flow constricting means, however in the second position, the fluid flow through the second conduit is b
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: February 8, 1977
    Assignee: Clark Equipment Company
    Inventors: Burton S. Zeller, Ronald L. Sisson
  • Brake controlled modulating clutch valves
    Patent number: 3990549
    Abstract: In a control system for a vehicle having a transmission with fluid actuated frictional engaging means and brake means wherein a first hydraulic passage means interconnects a fluid pressure source with the frictional engaging means, a regulating valve is disposed in the first hydraulic passage means, for regulating the pressure of the pressure fluid supplied to the frictional engaging means, with the regulating valve means also being operatively connected with the brake means and responsive to the degree of actuation of the brake means and actuatable between a first and a second position, whereby in the first position the pressure fluid can freely flow into, through and out of the inching valve toward the frictional engaging means, however in the second position, the fluid flow through a first set of radial apertures is blocked by a regulating spool and thereafter further radial apertures are progressively opened by the regulating spool means so as to regulate the force of the pressure fluid acting on the fric
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: November 9, 1976
    Assignee: Clark Equipment Company
    Inventors: Ronald L. Sisson, Philip J. Dreves