Patents by Inventor Robert J. Pirkey

Robert J. Pirkey 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: 5295562
    Abstract: The present invention provides a centrifugal brake which, according to one aspect of the invention, has a center hub from which extend flex members terminating in tabs extending from the flex members. Disposed on the opposite side of each flex member from the tab, is a friction portion. The friction portion is brought into contact with a braking surface when the centrifugal brake is rotated at sufficient speeds so that the centrifugal force acting on the tabs causes the flex members to bend and bring the friction portions into contact with the braking surface thereby resisting further acceleration of the centrifugal brake.
    Type: Grant
    Filed: August 14, 1992
    Date of Patent: March 22, 1994
    Assignee: Johnson Service Company
    Inventors: Roger V. Hajny, Robert J. Pirkey
  • Patent number: 4517942
    Abstract: An override speed control for the carburetor of a small internal combustion engine such as used with lawnmowers. The control for preventing changes in speed of the engine while a speed control lever is moved into its choke position comprises a speed control lever, an intermediate or enabling lever and a throttle control lever. The three levers are interconnected by means of extension springs one each of which connects the intermediate lever respectively to the speed control lever and the governor lever. The speed control lever in the last increment of movement of its control range actuates the choke valve of the carburetor. The governor lever controls the throttle valve of the carburetor. A governor driven by the engine and responsive to engine speed is connected to the governor lever. Adjustable stop means are provided on the intermediate lever to positively stop movement of the intermediate lever during the last increment of movement of the speed control lever.
    Type: Grant
    Filed: August 3, 1984
    Date of Patent: May 21, 1985
    Assignee: Tecumseh Products Company
    Inventors: Robert J. Pirkey, Stephen D. Ditter