Abstract: A four bar drive link system simulator 10 has a frame assembly 11, a proximal hinge attachment bracket 20, a bottom bracket simulator 40, a pair of crank levers 31L, 31R, a pair of coupling levers 32 and a pair of pedal simulator levers 22L, 22R. The frame assembly 11 has a plurality of guide rails, including at least a proximal hinge adjustment rail 22, and a frame simulator rail 13. The proximal hinge attachment bracket 20 is connected to the proximal hinge adjustment rail 22. The bottom bracket simulator 40 is attached or otherwise connected to the frame simulator rail 13. The pair of crank levers 31L, 31R is each attached at a first end to an axle 42 having its axis of rotation in the bottom bracket simulator 40, one crank lever being on one side of the bottom bracket simulator 40, the other on the opposite side. The pair of coupling levers 32 is each attached to an opposite second end of the crank lever 31L or 31R.

Abstract: An improved two wheeled reciprocating pedal driven scooter has a frame, front steering wheel, rear drive wheel, and rear wheel drive mechanism. The drive mechanism has two reciprocating foot pedals straddling the frame and extending to a forward hinge attachment location on the frame. The hinge location is at or above a drive axle. Each foot pedal has a short portion and an intersecting long portion forming a bend. The bend angle is 90 degrees or greater and is located at or below the frame. The attachment location of the foot pedal to the drive mechanism is at or near the bend. When the long portion of one foot pedal is at the bottom of the foot pedal stroke it is substantially horizontal, while the long portion of the other pedal is at the top of the stroke and is inclined to a maximum stroke angle of less than 35 degrees.

Abstract: A four bar drive link system simulator 10 has a frame assembly 11, a proximal hinge attachment bracket 20, a bottom bracket simulator 40, a pair of crank levers 31L, 31R, a pair of coupling levers 32 and a pair of pedal simulator levers 22L, 22R. The frame assembly 11 has a plurality of guide rails, including at least a proximal hinge adjustment rail 22, and a frame simulator rail 13. The proximal hinge attachment bracket 20 is connected to the proximal hinge adjustment rail 22. The bottom bracket simulator 40 is attached or otherwise connected to the frame simulator rail 13. The pair of crank levers 31L, 31R is each attached at a first end to an axle 42 having its axis of rotation in the bottom bracket simulator 40, one crank lever being on one side of the bottom bracket simulator 40, the other on the opposite side. The pair of coupling levers 32 is each attached to an opposite second end of the crank lever 31L or 31R.

Abstract: An improved two wheeled reciprocating pedal driven scooter has a frame including a steering assembly attached to the frame, a front steering wheel attached to a front axle attached to the steering assembly at the frame, a rear drive wheel attached to a rear axle attached to a rear portion of the frame and a drive mechanism for rotating the rear drive wheel. The drive mechanism has a pair of reciprocating foot pedals straddling each side of the frame, attached to and extending to a forward proximal hinge attachment location on the frame. Each of the foot pedals has a short portion and an intersecting long portion forming a bend at the intersection wherein an included angle ? between the short and long portions is 90 degrees or greater. The attachment location of the foot pedal to a coupling of the drive mechanism is at or near the intersection forming the bend of the short and long portions of each foot pedal.