Patent ID: 9310195
Filing Date: 2016-04-12
CPC Classification: G01B,G01D

Claim Text:
1. Apparatus adapted to provide an indication of an angular position of an input member over multiple turns, the apparatus comprising: a set of rotatable members configured, in use, to rotate in accordance with rotation of an input member, a set of sensing devices configured to measure and output an angular position of at least one of the rotatable members, and a device configured to use the angular position measurements from the set of sensing devices to produce an indication of an angular position of the input member over multiple turns, wherein the rotatable members are configured to rotate simultaneously but at different rates, the apparatus characterized in that: the set of rotatable members comprises at least three said rotatable members, and the set of sensing devices comprises at least three said sensing devices configured to measure and output an angular position of a respective one of the at least three rotatable members, and wherein each of the rotatable members has any unique ratio of revolution with respect to the other rotatable members, and wherein one of the set of rotatable members directly drives all remaining said rotatable members.