Trimmer potentiometer

Claim 1

IN A POTENTIOMETER, A HOUSING, A BEARING MEANS IN SAID HOUSING, A LEADSCREW OF INTEGRAL SOLID CONSTRUCTION ROTATABLY SECURED IN SAID BEARING MEANS, SAID LEADSCREW HAVING AT LEAST LIMITED LONGITUDINAL MOVEMENT IN SAID BEARING MEANS, A RESISTANCE COIL SECURED IN SAID HOUSING, A COLLECTOR BAR SECURED IN SAID HOUSING, WIPER CONTACT MEANS MOVABLY MOUNTED ON SAID LEADSCREW AND IN ENGAGEMENT WITH SAID COLLECTOR BAR AND SAID RESISTANCE COIL, A BORE IN SAID HOUSING AND COMMUNICATING WITH THE EXTERIOR THEREOF, ONE END OF SAID LEADSCREW EXTENDING INTO SAID BORE, AT LEAST A PORTION OF SAID LEADSCREW AND SAID BORE HAVING CLOSELY ADJACENT OPPOSING SURFACES DIAGONALLY DISPOSED WITH RESPECT TO THE LONGITUDINAL AXIS OF SAID BORE, THE DIAGONALLY DISPOSED OPPOSING SURFACE OF SAID LEADSCREW COMPRISING A PORTION OF ITS LENGTH WHEREIN ITS DIAMETER IS PROGRESSIVELY DECREASED FROM A HEAD PORTION OF LARGER DIAMETER TO A CENTER PORTION OF REDUCED DIAMETER, A RESILIENT SEALING MEANS INTERMEDIATE THE ADJACENT OPPOSING SURFACES OF SAID LEADSCREW AND SAID BORE, RETAINING MEANS ON SAID LEADSCREW URGING SAID LEADSCREW IN ONE DIRECTION OF LONGITUDINAL MOVEMENT TO MOVE THE OPPOSING SURFACES OF SAID LEADSCREW AND SAID BORE TOGETHER TO COMPRESS SAID SEALING MEANS, AND ELECTRICAL CONNECTING MEANS ON SAID COLLECTOR BAR AND SAID RESISTANCE COIL FOR CONNECTING SAID POTENTIOMETER IN AN ELECTRICAL CIRCUIT.