Patents Assigned to Graham Sommer
  • Patent number: 5328195
    Abstract: A dual drive bicycle includes an arm powered drive assembly including a drive mechanism mountable on one of the bicycle wheels or on the foot powered crank mechanism. The drive assembly includes a sprocket and a ratchet assembly for pivotal engagement with the sprocket wheel, a drive line coupled to the ratchet assembly for driving the ratchet assembly and the drive sprocket, and a free wheeling mechanism for coupling the ratchet assembly and the drive sprocket wheel. Movement of the handlebar moves the drive line which engages the ratchet assembly for driving the drive mechanism.
    Type: Grant
    Filed: July 13, 1993
    Date of Patent: July 12, 1994
    Assignee: Graham Sommer
    Inventors: Graham Sommer, Jason Quintana