Automatic rebalancing network including a movably mounted potentiometer and slip clutch connection thereto

Claim 1

IN A MEASURING INSTRUMENT HAVING A FRAME, A BALANCING MOTOR HAVING A SHAFT, MEANS SECURING THE BALANCING MOTOR TO THE FRAME, A POTENTIOMETER WITH A CASE AND A ROTATABLE SHAFT EXTENDING THEREFROM, MENS POSITIVELY AXIALLY AND RADIALLY COUPLING THE POTENTIOMETER SHAFT TO THE MOTOR SHAFT BYT PERMITTING RELATIVE ROTATION THEREBETWEEN WHEN THE POTENTIOMETER IS STALLED, SAID MEANS COMPRISING A HUB SECURED TO THE POTENTIOMETER SHAFT AND PROVIDED WITH CYLINDRICAL BORE INTO WHICH SAID MOTOR SHAFT EXTENDS, SAID HUB BEING PROVIDED WITH AN APERTURE THROUGH A WALL THEREOF TO SAID BORE, A SHOE PORTION EXTENDING THROUGH SAID APERTURE, INCLUDING MEANS FORMING AN ANNULAR GROOVE IN THE MOTOR SHAFT INTO WHICH THE SHOE PORTION EXTENDS TO LIMIT RELATIVE AXIAL MOVEMENT BETWEEN SAID HUB AND SHAFT, RESILIENT MEANS BIASING SAID SHOE PORTION AGAINST THE MOTOR SHAFT, AND MEANS PREVENTING ROTATION OF THE POTENTIOMETER CASE BUT PERMITTING LATERAL MOVEMENT THEREOF UPON DRIVE ACTUATION OF THE MOTOR SHAFT.