Abstract: A linear potentiometer, having a longitudinal housing with a resistance path and with a wiper guided by a push rod sliding therein. The push rod is supported at its entry into the housing of the potentiometer via a slide bearing which contains an elastic ring element, preferably an O-ring. This ring element embodies the sole connection between a stationary outer bearing and an inner bearing which is movable in a swinging manner relative to the outer bearing because of the elastic connection. The push rod slides in the inner bearing. The inner and outer bearings, by means of opposing annular grooves, receive the elastic ring element connecting them.

Abstract: A coupling device is provided for coupling the movable member of a machine to a potentiometer to convert sliding movement of the member into proportionate movement of potentiometer. The device includes a first rod which is attachable to the movable machine member and a second rod which is connectable to the potentiometer. A ball-shaped slide is attached to the first rod and a planar abutment is attached to the second rod. The glide piece and the abutment are in abuting contuct with one another. A biasing spring is provided which applies pressure, in a working direction, to the glide piece to thereby maintain the glide piece and the planar abutment in intimate engagement with one another. This arrangement forms a joint connection between the first and second rods which enables transmission there between of only translational movement.