Front derailleur for a bicycle
AssigneeShimano Industrial Company Limited
InventorMasashi Nagano
Life of this patent
Estimating the term…
Abstract
A front derailleur for a bicycle is of the link type and comprises four members of a fixing member, two linkage members and a movable member, one of the four members carrying a chain guard for preventing a driving chain from coming off a front gear. The chain guard comprises a mounting plate for mounting to one of the four members and at least one guard plate for preventing the chain from coming off of the gear.
Claims8
A front derailleur for a bicycle, through which a driving chain is switched to one of multi-stage front gears, said front derailleur including:
- four members comprising a fixing member, two linkage members pivoted to said fixing member, and a movable member pivoted to said two linkage members and movable through said two linkage members in parallel with respect to said fixing member;
- and
- a chain guide fixed to said movable member and movable therewith for guiding said driving chain to one of said front gears;
- one of said four members having a chain guard for preventing said chain from coming off one of said front gears, said chain guard comprising a mounting plate for mounting with said one of the four members and at least one guard plate for preventing said chain from coming off one of said front gears, said guard plate extending ahead of said chain guide in the forward travelling direction of said chain and being positioned at the lateral side of a low speed gear of a minimum diameter reverse to a high speed gear of a maximum diameter among said front gears, so as to be opposite said low speed front gear at an interval smaller than the width of said chain.
A front derailleur for a bicycle, through which a driving chain is switched to one of multi-stage front gears, said front derailleur including:
- four members comprising a fixing member, two linkage members pivoted to said fixing member, and a movable member pivoted to said two linkage members and movable through said two linkage members in parallel with respect to said fixing member;
- and
- a chain guide fixed to said movable member and movable therewith for guiding said driving chain to one of said front gears;
- said fixing member having a chain guard for preventing said chain from coming off one of said front gears, said chain guard comprising a mounting plate for mounting with said fixing member and at least one guard plate for preventing said chain from coming off one of said front gears, said guard plate extending ahead of said chain guide in the forward travelling direction of said chain and being positioned at the lateral side of a low speed gear of a minimum diameter reverse to a high speed gear of a maximum diameter among said front gears, so as to be opposite said low speed front gear at an interval smaller than the width of said chain.
Dependencies are inferred from the claim text.