Multiturn rotary potentiometer

Claim 1

A VARIABLE RESISTOR COMPRISING: FIRST MEANS, INCLUDING ROTARY MEANS COMPRISING AN ELONGATE ROTOR ROTATABLE ABOUT A LONGITUDINAL AXIS, SAID ROTOR HAVING FIRST AND SECOND LONGITUDINALLY-EXTENDING GROOVE GUIDEWAYS THEREIN AND SAID GROOVES BEING SPACED APART BY A LONGITUDINALLY EXTENDING INTERVENING PORTION; SAID FIRST MEANS COMPRISING A LONGITUDINALLY-EXTENDING ELECTRICAL RETURN CONDUCTOR MOUNTED ON SAID INTERVENING PORTION OF SAID ROTOR BETWEEN SAID GROOVES, AND TERMINATING IN A BRUSH MEANS AT ONE END OF THE ROTOR; SECOND MEANS, INCLUDING A HELICAL RESISTANCE ELEMENT THE AXIS OF THE HELIX OF WHICH IS COINCIDENT WITH SAID LONGITUDINAL AXIS AND THE NEXT-ADJACENT CONVOLUTIONS OF WHICH ARE LONGITUDINALLY SPACED APART, AND INCLUDING MEANS SUPPORTING SAID RESISTANCE ELEMENT AND SAID ROTOR IN COAXIAL RELATIONSHIP; THIRD MEANS, COMPRISING ELECTRICAL TERMINAL MEANS FOR SAID RESISTANCE ELEMENT AND TERMINAL MEANS INCLUDING A CONDUCTIVE RING AROUND SAID AXIS AND DISPOSED FOR CONTACT BY SAID BRUSH MEANS DURING ROTATION OF SAID ROTOR; AND FOURTH MEANS, COMPRISING A RESILIENT GENERALLY ARCHSHAPED SLIDER DEVICE DISPOSED BETWEEN SAID RESISTANCE ELEMENT AND SAID ROTOR AND HAVING AN ARCH-FORMING BODY PORTION HAVING AT LEAST ONE GUIDE PORTION EXTENDING BETWEEN ADJACENT CONVOLUTIONS OF SAID ELEMENT AND FORMED COMPLEMENTARY THERETO AND SAID SLIDER HAVING AT LEAST ONE PORTION STRADDLING AN ARCUATE PORTION OF SAID RESISTANCE ELEMENT AND SAID SLIDER DEVICE FURTHER HAVING FIRST AND SECOND GENERALLY INWARDLY DIRECTED OPPOSED END PORTIONS RIDING IN RESPECTIVE ONES OF SAID GROOVE GUIDEWAYS AND IN THE RELAXED STATE OF THE SLIDER DEVICE BEING CLOSER TOGETHER THAN WHEN DISPOSED IN SAID GROOVE GUIDEWAYS, WHEREBY SAID END PORTIONS ARE CAUSED TO COMPRESSIVELY PRESS AGAINST AND EMBRACE SAID INTERVENING PORTION OF SAID ROTOR TO ELIMINATE LOST MOTION THEREBETWEEN, SAID SLIDER DEVICE CARRYING A CONTACT MEANS THEREON HAVING PORTIONS DISPOSED TO BRUSH ON SAID RETURN CONDUCTOR AND ON SAID RESISTANCE ELEMENT.