Patents by Inventor Harold Cragg

Harold Cragg 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).

  • Wheel chairs
    Patent number: 3955639
    Abstract: A wheel chair having electric driving means arranged to drive the rear wheels of the chair, each rear wheel and its associated electric driving means is supported by a wheel plate connected to the wheel chair frame by a resilient mounting embodying a suspension media providing independent suspension for the rear wheels. The electric driving means comprises one electric motor for each rear wheel with drive transmission to the associated wheel.
    Type: Grant
    Filed: December 4, 1974
    Date of Patent: May 11, 1976
    Assignee: The Spastics Society
    Inventor: Harold Cragg
  • Electric drive for wheel chairs
    Patent number: 3930551
    Abstract: In a wheelchair, battery operated electric driving means for driving two wheels each mounted on a wheel plate connected to the wheelchair frame. For each driven wheel a motor is carried on the wheel plate and drive is transmitted to a pinion fixed on the wheel through a pivotal gear carrier carrying one or two idler gears in constant mesh with the fixed pinion, but movable into or out of mesh with a motor driven pinion on controlled pivotal movement of the gear carrier.
    Type: Grant
    Filed: June 10, 1974
    Date of Patent: January 6, 1976
    Inventor: Harold Cragg