Rack-type actuator, has an actuator rod with an integral conducting path for use with a potentiometer to determine rod position with respect to an actuator body

摘要

Actuator comprises a body and an actuator rod (14) that slides relative to the body. Movement is via a motor and screw mechanism or similar. The actuator includes a potentiometer whose resistance varies with the position of the rod relative to the body. The potentiometer comprises a resistive path (30) on the surface of the rod (14). A cursor (32) integral with the body slides up and down the rod making an electrical connection, thus changing the resistance.