DISRAELI DOCUMENTS

French Patent # 813,241

French Patent 813,241 - Huret main image

This patent describes a single pulley derailleur that uses a cog-based operating mechanism - echoing the Westminster design in French Patent 785,604. I believe that this contraption was the basis of a production model - I have seen photos of real examples of something very similar. The version I have seen in photos differs by having a shaped chain-pusher-plate on either side of the pulley wheel.


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