This patent introduces the doomed, but rather classy, Cyclo Benelux Super 60. The patent stresses the familiar Cyclo Gear Company obsession with adjustable the chain tension.

It’s not hard to see the strengths of the design when compared the the Campagnolo Gran Sport of the time - notably the swing adjuster and the offset pulley cage. But it’s also not hard to see the rampant over-complication that can only have increased the price and reduced the reliability.

• Publisher: UK Intellectual Property Office
• Inventor: Arthur Roland Everill
• Country: UK
• Date: UK application filed June 1959
• Derailleur brands: Cyclo Gear Company
• Derailleurs: Cyclo Benelux Super 60 (1st style)