This patent covers the ORK derailleur manufactured by AB Carl Särenholm of Eskilstuna, Sweden.

The derailleur is a single pulley, two-speed, design with a horizontal parallelogram. It's yet another example of a parallelogram design many years before the Campagnolo Gran Sport.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: Karl Martin Alm
• Country: France
• Date: Priority date April 1944
• Derailleur brands: ORK
• Derailleurs: ORK