Patents by Inventor David J. Thum

David J. Thum 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).

  • Publication number: 20030126826
    Abstract: A hinged protective cover for protecting a door threshold during construction or modification of a building or its contents. The cover is attached to a horizontal surface such as a building floor and covers the door threshold to prevent damage from foot traffic, contaminants and grit materials which may become lodged in the threshold. The hinge allows positioning of the protective cover to permit door closure while remaining attached to the floor. This leaves the cover in place for repositioning to the protecting position when the door is reopened and serves as an affirmative reminder to accomplish same.
    Type: Application
    Filed: January 7, 2003
    Publication date: July 10, 2003
    Inventors: John R. Marshall, David J. Thum
  • Patent number: 5741205
    Abstract: In a simulated stairclimbing apparatus having a pair of pedal members rotatably attached at one end to the frame of the apparatus and having a foot pedal rotatably attached to the other end of each pedal member, a pulley is attached to each pedal and another pair of pulleys is attached to the frame where flexible members such as cables are engaged with the pedal and frame pulleys for each pedal member so as to keep the pedals level through the vertical motion of the pedals. In another arrangement, a pair of flexible members are rotatably attached to each pedal and to the frame where the pedal member is located between each of the two flexible members so as to keep the pedals level through the vertical motion of the pedals.
    Type: Grant
    Filed: December 7, 1995
    Date of Patent: April 21, 1998
    Assignee: Life Fitness
    Inventors: James W. Doll, David J. Thum, Michael A. Niemotka, Steven M. Lenz, Mark C. Termion
  • Patent number: 5403252
    Abstract: A climbing exercise apparatus is provided having a frame on which two pedals are pivotally mounted to provide a user with a vertically reciprocating exercise movement, and a control panel for user input and output. A dynamic break, alternator or the like applies a variable level of resistance (via a suitable transmission) against the user's movement. The resistance varies over time in accordance with a control signal generated by a computer. The value of the control signal is independent of the rate at which the user steps. A display successively displays images of hills. Each hill is associated with one of the series of values, and that value is graphically represented as part of or in visual association with the hill image.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: April 4, 1995
    Assignee: Life Fitness
    Inventors: Tomas F. Leon, Robert L. Hood, Robert E. Quast, David J. Thum, Emil S. Golen
  • Patent number: 5238462
    Abstract: A stair type exercise apparatus is disclosed in which two pedal members reciprocate. The pedal members can either be directly connected together by a cog drive belt which in turn operates through a transmission providing a resistive force to the pedals or the pedals can be individually connected to the transmission by a drive belt. The resistive force is supplied by an alternator which is controlled by a computer.
    Type: Grant
    Filed: February 20, 1991
    Date of Patent: August 24, 1993
    Assignee: Life Fitness
    Inventors: Steven J. Cinke, Michael K. Platt, David J. Thum
  • Patent number: 5135447
    Abstract: A step type exercise apparatus is disclosed in which two pedal members are connected for reciprocating movement by a chain which, in turn, operates through a transmission providing a resistive force to the pedals. The resistive force is supplied by an alternator which is controlled by a computer. Means are provided to lubricate the chain thereby prolonging the life of the chain.
    Type: Grant
    Filed: March 15, 1991
    Date of Patent: August 4, 1992
    Assignee: Life Fitness
    Inventors: Chester F. Robards, Jr., Steven J. Cinke, Stephen A. Waltasti, Robert Kohan, Donald J. Alexander, Douglas G. Guenther, David J. Thum, Tomas Leon