Method to change the gears of a bicycle and the...

Details Method to change the gears of a bicycle and the... Method to change the gears of a bicycle and the...

B - Operations, Transporting

62

M

B62M 9/12 (2006.01)

Patent

CA 2137292

A bicycle gear change mechanism has a front chain sprocket assembly(1)with at least two chain sprockets, a drive chain(19), a front derailleur(2)mounted to a carrying piece (10), a rear chain sprocket assembly(3)with at least two chain sprockets, a rear derailleur(4)mounted to a frame part(20), a chain straining device(13)including a carrying piece(5)with two tension pulleys(6) a parallelogram(7)and a carrying part(8). The rear sprocket assembly is provided with a free wheel coupling. The arrangement allows a gear shifting by rotating the drive chain backwards, that means the opposite direction to the chain drive direction. Fig.1.

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