altering the ratio of motion or force between controlling member and controlled member as a function of the position of the controlling member

Full Title

Manually-actuated control mechanisms provided with one single controlling member co-operating with one single controlled member; Details thereof (controlling members G05G1/00) > characterised by special provisions for conveying or converting motion, or for acting at a distance > altering the ratio of motion or force between controlling member and controlled member as a function of the position of the controlling member