Adjustable chain controls motorcycles from handlebars

Philip Tucker from Sittingbourne, who lost his leg in a motorcycle accident, has devised a mechanism that replaces the clutch and brake handles on a motorcycle handlebar with a single unit.

This includes a means of actuating a brake master cylinder in a manner in which the mechanical advantage of the handle can be easily adjusted.
It works by varying the length of one of the linkages in a four bar chain. A simple thumbscrew adjustment moves one of the pivot points along one of the links – making a large difference to the mechanical advantage.

Tom Shelley

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