CHANGE GEAR MECHANISM FOR BICYCLE

WIPO Patent Application WO/1992/010395

A1

The following technical means are provided in order that change of chains can be performed with a minimum moving distance of a guide pulley, a change gear efficiency and a change gear controllability are improved and the change gear mechanism is prevented from projecting. In front of a multi-stage sprocket (2), a link base (8) of a pantagraph link mechanism (12) is supported by a chain stay (7), an internal link (9) and an external link (10) are extended rearwardly from the link base, a chain guide (15) is rotatably supported on a movable member (11) connected to the rear end portions of these links in a manner to be resiliently biasing, and a guide pulley movement control means (18) is provided, so that when the pantagraph link mechanism (12) is deformed, a guide pulley (13) of the chain guide (15) moves inwardly in a direction of a hub axis, and simultaneously, moves obliquely and downwardly in the forward direction, substantially along one of the radii of the aforesaid multi-stage sprocket (2).

IWASAKI YOSHIHISA (JP)
TAKEDA TOHRU (JP)
OHTA MASAO (JP)

PCT/JP1991/001702

June 25, 1992

December 06, 1991

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MAEDA IND (JP)
BRIDGESTONE CYCLE CO (JP)

B62M9/1242; B62M9/126; (IPC1-7): B62M9/12

JPS338017Y1
JPS5522315B2	1980-06-16
JPS60191591U	1985-12-19
US4023424A	1977-05-17
US3903751A	1975-09-09
JPS5591478A	1980-07-11

Edited by Zaidan Hojin Automobile Industry Association "Automobile Practical Handbook the 4th edit", September 25, 1982 (25. 09. 82), P. 711, P. 723-724.
See also references of EP 0513394A4

Higuchi, Toyoharu (Tennoji-ku Osaka-shi, Osaka-fu 543, JP)

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