An apparatus for moving a member between a retracted position and an extended position includes a housing, a movement mechanism, a linear lead screw, a first carriage, and a second carriage. The housing has a curved path between the retracted position and the extended position. The lead screw has a longitudinal...http://www.google.com.au/patents/US6038127?utm_source=gb-gplus-sharePatent US6038127 - Keypad assembly using a lead screw assembly for moving a curved member
