DISRAELI DOCUMENTS
This rather sophisticated design shows a twin pulley touring derailleur in which the pulley cage slides along two slanted rails, in an attempt to maintain a reasonably constant chain gap. As such it anticipates some of the benefits of SunTour’s game-changing sloping parallelogram design. It certainly shares a lot with White Industries’ 1996 LMDS concept.
It is worth noting that on this French patent the inventor is listed as Claudius Jacquemard. However, in the equivalent UK Patent # 408,915 - Idéal, the inventor is listed as Giovanni Perona of Torino. Perhaps Giovanni is the original inventor and sold his design to Claudius who then marketed this design under his Idéal brand.
