Patents Assigned to Concentric Industries
  • Wheelchair with coasting, braking and multi-speed features
    Patent number: 5160156
    Abstract: A wheelchair is provided with a multiple speed hub, each including a self-contained shifting mechanism for selectively changing gears. The hubs include both coasting and braking features and are controlled by drive rings mounted concentric with the wheelchair rear wheels. The mechanism permits hands-on shifting, coasting and braking actions.
    Type: Grant
    Filed: September 13, 1990
    Date of Patent: November 3, 1992
    Assignee: Concentric Industries
    Inventor: Stephen P. Mendon