Variable resistor device

A variable resistor device comprising:

• an electrically non-conductive support member having a base wall portion and a pair of end wall portions substantially perpendicular to the inner face of the base wall portion and each formed with an elongate recess extending substantially perpendicularly to the inner face of said base wall portion from the free end of each end wall portion and terminating with a substantially semicircularly curved edge;
• an elongate resistance element extending longitudinally of said base wall portion and fixedly secured to the base wall portion;
• an electrically conductive rotatable control shaft received on the semicircular curved edges of said end wall portions and having a threaded axial portion extending over and substantially in parallel with said resistance element;
• first and second terminal elements connected to the longitudinal ends of the resistance element and secured to said non-conductive support member;
• electrically conductive retaining means for snugly releasably retaining said control shaft in position relative to said support member while permitting the control shaft to rotate about its axis, said retaining means including a third terminal element which is in constant contact with said control shaft;
• and an electrically conductive slider having an elastic contact portion elastically forced against the longitudinally slidable on and along said resistance element and having a lateral edge portion in engagement with said threaded axial portion of said control shaft.