Patents by Inventor Larry J. Graf

Larry J. Graf 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).

  • Exercise apparatus ergometer
    Patent number: 4770411
    Abstract: An ergometer (28) is employed on an exercise cycle (10) having a flywheel (20) rotated by pedals (16). A selectively tensionable endless belt (26) extends around the perimeter of flywheel (20) and a separate strap (160) is attached to the endless belt (26) to extend tangentially from the flywheel (20). The opposite end of strap (160) is connected to one end of an indicator plate (162) with the other end of the indicator plate attached to one end of an extension spring (164). The extension spring (164) imparts a tensile load on strap (160) equal to the opposing tensile load on the strap (160) imposed by the frictional force acting between endless belt (26) and the flywheel (20). This force level is sensed by the movement of the indicator plate (162) which coincides with the extension of spring (164), which plate movement corresponds to the workout level being achieved.
    Type: Grant
    Filed: October 2, 1987
    Date of Patent: September 13, 1988
    Assignee: Precor Incorporated
    Inventors: Timothy O. Armstrong, Larry J. Graf, William W. Potts
  • Skiing exerciser or similar article
    Patent number: D299369
    Type: Grant
    Filed: October 9, 1986
    Date of Patent: January 10, 1989
    Assignee: Precor Incorporated
    Inventors: David B. Smith, Larry J. Graf, Randolph F. Miller
  • Skiing exerciser or similar article
    Patent number: D303695
    Type: Grant
    Filed: January 5, 1987
    Date of Patent: September 26, 1989
    Assignee: Precor Incorporated
    Inventors: David B. Smith, Larry J. Graf, Randolph F. Miller