04574649 is referenced by 214 patents and cites 27 patents.

Propulsion and speed change mechanism for lever propelled bicycles having a pair of propulsion levers 4, each of which is built in one piece with a speed change arm 3 and mounted in each side of the main shaft portion 2 at the bottom of the bicycle frame 1. A rear axle 5 and a hub 6 is mounted on the rear shaft portion 2'. A one-way clutch mechanism has roller-type free wheels 11a installed at both ends of the rear axle. Chains 7", the ends of which may be connected together with a see-saw cable 7', are entrained around gears 7 and guide rollers 13. The free ends of the chains are connected by connecting bars 14 having pins to the speed change arm 3. Pivotally mounted members 15 of triangular shape and a cam bar 17 operated by a speed control knob 18 are used to change the effective length of the arm for speed control.

Title
Propulsion and speed change mechanism for lever propelled bicycles
Application Number
6/463085
Publication Number
4574649
Application Date
February 2, 1983
Publication Date
March 11, 1986
Inventor
Man T Seol
Dae Jeon
KR
Agent
R Hallenbeck
M LuKacher
Assignee
B D Yim
NY, US
IPC
B62M 1/04
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