Abstract A cycle gear change enabling the cycle drive chain to pass from one free wheel pinion to another, these pinions having a relatively large difference in the number of teeth in order to obtain a large speed variation for the moving cycle, this gear change being fitted with a roller which may be displaced crosswise to a cycle free wheel so as to ensure cross-wise displacement of the chain and its passage from one free wheel pinion to the other, and a second roller articulated in relation to the first so as to keep the drive chain under tension, gear change characterized by the fact that it comprises a guide pivoting freely on a spindle and straddling the portion of chain situated between the free wheel and the first roller. May be applied to all cycles.
A cycle gear change comprising a roller which may be displaced cross-wise to a cycle free wheel to ensure cross-wise displacement of the chain and its passage from one free wheel pinion to the other, and a second roller articulated in relation to the first so as to keep the drive chain under tension, gear change characterized by the fact that it comprises a guide pivoting freely on a spindle and straddling the portion of chain situ-ated between the free wheel and the first roller.
Claim 2
Dependent Claim
85 words
A cycle gear change comprising a roller which may be displaced cross-wise to a cycle free wheel to ensure cross-wise displacement of the chain and its passage from one free wheel pinion to the other, and a second roller articulated in relation to the first so as to keep the drive chain under tension, gear change characterized by the fact that it comprises a guide pivoting freely on a spindle and straddling the portion of chain situ-ated between the free wheel and the first roller.
Claim 3
Dependent Claim
25 words
A gear change in accordance with claim 1, in which the spindle receiving the freely-pivoting guide is identical with that supporting the first drive roller.
Claim 4
Dependent Claim
46 words
A gear change in accordance with claim 1, in which the guide is made up of a pivoting metal plate having flanges to straddle the chain, said metal plate being positioned, in relation to the first roller, on the side of the smallest free wheel pinion.