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Patent Searching and Data


Title:
ECCENTRIC TYPE CRANK
Document Type and Number:
WIPO Patent Application WO/1999/026836
Kind Code:
A1
Abstract:
An eccentric type crank for a bicycle in which the length between a crank shaft and a pedal shaft can be varied according to an orbital motion of an eccentric follower such that the length becomes longer where a stepping force is applied and becomes shorter where the stepping force is not required. A follower (3) is inserted in a cylindrical follower unit (2) through bearings (5, 6). A pedal shaft (10a) which is rigidly attached with a pedal (13) is secured to the follower at an eccentric position offset from the center of the follower. The pedal integrated with the follower performs an eccentric motion inside the unit while at the same time advantageously changing the length between the pedal shaft and the crank shaft.

Inventors:
NUMATA YUKIO (JP)
Application Number:
PCT/JP1998/005153
Publication Date:
June 03, 1999
Filing Date:
November 17, 1998
Export Citation:
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Assignee:
TECHNOVALLEY CO LTD (JP)
NUMATA YUKIO (JP)
International Classes:
B62M3/06; B62M3/04; F16H21/18; F16H35/00; (IPC1-7): B62M3/00; B62M3/04; B62M3/08
Foreign References:
FR2441534A11980-06-13
GB2055077A1981-02-25
JPS60102191U1985-07-12
JPH04372487A1992-12-25
JPH08510424A1996-11-05
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