Trimmer potentiometer

Claim 1

IN A MINIATURE POTENTIOMETER, A HOUSING COMPRISING, A FIRST CASING BEING SUBSTANTIALLY RECTANGULAR IN SHAPE AND HAVING A TOP, TWO SIDES, TWO ENDS AND AN OPEN BOTTOM COMMUNICATING WITH AN INTERIOR COMPARTMENT, A SECOND CASING BEING PARTIALLY RECEIVED IN SAID COMPARTMENT AND FORMING THE BOTTOM OF SAID HOUSING, SAID SECOND CASING HAVING AN ELONGATED DEPRESSION, SUBSTANTIALLY STRAIGHT SIDE WALLS FORMING THE SIDES OF SAID DEPRESSION AND THE LOWER PORTION OF SAID SIDE WALLS EXTENDING DOWNWARDLY AND CONVERGING TO FORM A V-SHAPED GROOVE AT THE BOTTOM OF SAID DEPRESSION, AN ELONGATED RESISTANCE COIL BEING SUBSTANTIALLY CIRCULAR IN CROSS SECTION BEING IN ENGAGEMENT WITH THE VSHAPED WALLS OF SAID GROOVE, MEANS FOR SECURING SAID COIL IN SAID DEPRESSION, AND ELONGATED LEADSCREW, A COLLECTOR BAR AND SAID RESISTANCE COIL SECURED TO SAID HOUSING, 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, A SEALING MEANS INTERMEDIATE THE ADJACENT OPPOSING SURFACES OF SAID LEADSCREW AND SAID BORE, MEANS ON SAID LEADSCREW URGING SAID LEADSCREW IN ONE DIRECTION OF LONGITUDINAL MOVEMENT TO COMPRESS SAID SEALING MEANS, A WIPER BLOCK MOVABLE WITH SAID LEADSCREW, SAID WIPER BLOCK HAVING TWO ENDS AND TWO PAIRS OF OPPOSITE SIDES, AND A WIPER ARM EXTENDING OUTWARDLY FROM EACH OF ONE PAIR OF OPPOSITE SIDES OF SAID WIPER BLOCK, EACH OF SAID WIPER ARMS BEING BENT UPON ITSELF TO EXTEND SUBSTANTIALLY OVER SAID WIPER BLOCK INTO ENGAGEMENT WITH ONE EACH OF SAID COLLECTOR BAR OR SAID RESISTANCE COIL.