Abstract: A recumbent bicycle frame having a frame tube with a first shoulder area formed on a side thereof. The shoulder area extends for at least a portion of the length of the frame tube. The frame tube has a generally flat exterior surface above the first shoulder area. The frame tube also has a second shoulder area formed on an opposite side of the frame tube from the first shoulder area. The frame tube has a bottom shoulder area formed on the side of the frame. A generally flat exterior surface extends below this bottom shoulder area. An interior passageway extends longitudinally through the frame tube and includes first and second notched areas formed in the wall of the interior passageway. These notched areas receive a reinforcement tubing member therein. First and second slots are formed at the top and at the bottom of the wall of the interior passageway of the frame tube. A clamp member is removably connected to the first and second shoulder areas and has a portion extending across the flat exterior surface.

Abstract: A power driven wheel chair is described which includes a rear wheel support frame and at least two ground engaging rear wheels mounted in spaced relation to opposed sides of the rear wheel support frame. A front wheel support frame is pivotally secured to the rear wheel support frame for pivotal movement about a substantially horizontal axis. At least two ground engaging front wheels are mounted in spaced relation to opposed sides of the front wheel support frame. A drive motor provides motive force to at least one wheel of one of the pairs of at least two ground engaging wheels. A chair is mounted on one of the rear wheel support frame and the front wheel support frame. The wheel chair, as described, has added stability as relative pivoting of the rear wheel support frame and the front wheel support frame maintains the wheels in contact the ground at all times.