This patent covers the extended sleeve (30 in the drawing above) with a cut out (21 in the drawing above). This sleeve protects the toggle chain when you have a ‘spill’ - as the text so charmingly puts it. This cunning device featured on the Benelux Sport, an ehanced Benelux model which also featured a ‘super finish’. Spiffing.

• Publisher: UK Intellectual Property Office
• Inventor: Louis Camillis
• Country: UK
• Date: UK application filed June 1952
• Derailleur brands: Cyclo Gear Company
• Derailleurs: Cyclo Benelux Sport