| 摘要 |
PCT No. PCT/IT96/00095 Sec. 371 Date Dec. 17, 1996 Sec. 102(e) Date Dec. 17, 1996 PCT Filed May 9, 1996 PCT Pub. No. WO96/35605 PCT Pub. Date Nov. 14, 1996An arm propulsion system for mounting on a bicycle includes a first crank and a second crank mounted on opposite ends of a connection and rotation pin. These cranks are mounted in a specular position with respect to one another. Hand-grips are connected with the cranks. The hand-grips lie on a common axis and are rotatable about the common axis, and this common axis is parallel to the axis of the connection and rotation pin. To apply propulsion force to the bicycle front tire, a first sprocket wheel, located coaxial with the connection and rotation pin, is connected with a second sprocket wheel by a first transmission mechanism (e.g., a chain). A third sprocket wheel, located coaxial with the second sprocket wheel, connects with the front wheel of the bicycle by a second transmission mechanism. A connection element is provided on the connection and rotation pin. This connection element includes a first toothed surface facing the first sprocket wheel, wherein when the first toothed surface engages a second toothed surface provided on the first sprocket wheel, the cranks are rotatable. Moreover, when another toothed surface on the connection element engages a fixed surface (optionally located on a box or housing for the connection element), the cranks are fixed. |
