Control device with axially aligned, independently rotatable variable resistors

Claim 1

A control device comprising a. a pair of cup shaped members, each having bottom portions and upstanding sides, b. retaining means holding said cup-shaped members in back-toback relationship such that said bottom portions abutt oneanother, c. at least two apertures in each of said bottom portions, two of said apertures in one of said bottom portion axially aligned with corresponding apertures in the other of said bottom portions, d. bearing flanges extending from said apertures into each of said cup shaped members, e. dielectric base members closing said cup shaped members and having apertures disposed therein in line with said apertures in said bottom portions, f. dielectric rotors rotatably journalled on said bearing flanges and extending through said apertures in said base members, anD means connected to said rotors to manually rotate said rotors, one of said rotors being hollow and said means connected to said rotor comprises a hollow shaft extending from said hollow rotor and means in the other of said rotors receiving a tool inserted through said hollow shaft and rotor, and g. collector and resistance paths carried by said base members, and electrical contact means carried by said rotors electrically bridging said collector and said resistance paths.