Electrical control having an insulated shaft extension

Claim 1

An electrical control comprising a base, a resistance path secured to the base, a driver of insulating material, a contactor constrained to move with the driver for making wiping contact with the resistance path, a metal shaft extending from said driver, a shoulder on a portion of said metal shaft and extending perpendicularly from the longitudinal axis of the shaft, an insulated shaft extension of deformable material and directly secured to said metal shaft, said insulated shaft extension comprising a hollow portion in telescopic relation with the portion of said metal shaft provided with the shoulder, external alignment means on the metal shaft cooperating with internal alignment means on the shaft extension, said means orienting the metal shaft to the shaft extension and preventing relative rotation therebetween, and at least one tab permanently deformed and extending inwardly from said hollow portion of the shaft extension into direct engagement with said shoulder and maintaining said hollow portion positively mechanically locked to said metal shaft, the outer surface of the hollow portion of the shaft extension being provided with an indentation resulting from the inward deformation of the tab into direct engagement with the shoulder.