Abstract: A control knob to shaft assembly including a rotatable, bifurcated shaft, the bifurcation spanning the diameter of the shaft and having a central cylindrical bore interconnecting two open slots, one of which has a width larger than the other. There is also provided an escutcheon plate in a plane that intersects the longitudinal axis of the shaft at an acute angle and has an opening therethrough. A knob is received in the escutcheon plate opening and has a first portion larger in diameter than the escutcheon plate opening, a second portion having two projecting spaced parallel legs with a yoke connecting and spanning the legs. The yoke has a central ball shaped portion with a diameter slightly smaller than the cylindrical bore in the shaft and is received in the cylindrical bore.

Abstract: A rotatable knob assembly having a knob easily mounted to the mounting section of an operating member, with the mounting section having two adjacent parts with a first part having a generally elliptical cross section and the other part having a generally circular cross section and with the knob having an open-ended cavity and an upstanding ridge on the inner surface of the cavity surrounding the wall which is of generally the same perimetrical length as the generally equal perimetrical lengths of the two parts of the mounting section. The knob is formed of a material which is capable of being distorted whereby placement of the knob on the mounting section by relative insertion of the mounting section into the cavity causes distortion of the locking ring to pass over the generally elliptical cross section part and the locking ring then returns to its normal shape to engage against the generally circular part of the mounting section and to lock behind the elliptical section.