Linkages

摘要

An electromechanical transducer comprises first and second links pivotally connected to a base, an electrical resistance element in the form of a track mounted on the base and a wiper arm mounted at one end of the second link and slidingly engaging the track. The first link and the second link are so coupled that pivoting one link is operative to pivot the other link and the angle through which the second link pivots is substantially greater than the angle through which the first link pivots. By suitable selection of the shape and/or the resistance profile of the track, the angular movement of the first link may be arranged to be a particular linear or non-linear function of the resistance tapped by the wiper arm. A control unit incorporating the transducer is also described.