Molded control knob

Claim 2

A unitary knob for turning a D-shaft of an electrical control comprising a body having a front face and a cylindrical gripping portion, a receiver within said body having a floor portion which includes a resilient bridge spanning the receiver in the direction of shaft insertion, said bridge member extending from said receiver through said front face and having a hook shape with the reverse turned end of the hook shape formed integral with said face, a roof portion, and a rear opening for axially receiving the D-shaft and a stationary ramp element on said floor portion for receiving the flat portion of a D-shaft and directing the D-shaft during axial insertion into said receiver to press the cylindrical portion of the D-shaft against said roof portion and maintain the D-shaft in engagement with the roof portion whereby the shaft turns with the ramp preventing slipping.

Claim 3

A knob for turning a shaft comprising a unitary molded body which includes a front face and a receiver opening at the rear of the knob, said receiver having a floor, side frames extending from said floor for receiving the outer axial surface of a shaft, with a space adjacent said side frames from which the shaft may be moved radially against said side frames, a roof portion attached to said side frames, and cam means attached to a resilient bridge of said floor in said receiver for directing said shaft from said adjacent space into tight engagement with said roof portion as the shaft is moved axially into the receiver, said resilient bridge extending from said receiver and having a hook shape at the exterior of said receiver which joins with said front face of said knob.

Claim 4

A knob for turning a shaft comprising a unitary molded body which includes a front face and a receiver opening at the rear of the knob, said receiver having a floor, side frames extending from said floor for receiving the outer axial surface of a shaft, with a space adjacent said side frames from which the shaft may be moved radially against said side frames, a roof portion attached to said side frames, and cam means attached to a resilient bridge of said floor in said receiver for directing said shaft from said adjacent space into tight engagement with said roof portion as the shaft is moved axially into the receiver, said resilient bridge extending from said receiver and having a hook shape at the exterior of said receiver which joins with said front face of said knob.

Claim 5

A unitary molded knob for turning the D-shaft of a rotary electrical control comprising a face plate portion and a cylindrical sidewall portion joining said face plate portion and defining an open cavity within said knob, a central portion in said face plate portion, a cage structure in said cavity having opposite open ends, the first open end being in registry with said portion, rib means integral with said cage structure, face plate portion and cylindrical sidewall and supporting said cage structure portion within said cavity, said cage structure having a base frame portion and a pair of side frame portions upstanding therefrom and jointed to one end of a roof structure portion which has a gable at its other end above said port, a bridge member extending from said base frame portion through said port and having a hook shape at the exterior of said cavity turned back with the turned end of the hook shape joined to the front surface of said face plate portion at the base of said port, and a ramp element on said bridge member for receiving the flat of a D-shaft and camming the D-shaft during axial insertion into said cage through the second open end thereof to press the cylindrical portion of the D-shaft against the bottom of said roof structure before the end of the D-shaft moves into abutment with the inner surface of the gable, said bridge member being sufficiently resilient to maintain a bias on said ramp against the D-shaft flat and thereby maintain the D-shaft in tight engagement with the roof structure and interlock the knob with the D-shaft for rotary movement therewith.

Claim 6

A unitary molded knob for turning the D-shaft of a rotary electrical control comprising a face plate portion and a cylindrical sidewall portion joining said face plate portion and defining an open cavity within said knob, a central portion in said face plate portion, a cage structure in said cavity having opposite open ends, the first open end being in registry with said portion, rib means integral with said cage structure, face plate portion and cylindrical sidewall and supporting said cage structure portion within said cavity, said cage structure having a base frame portion and a pair of side frame portions upstanding therefrom and jointed to one end of a roof structure portion which has a gable at its other end above said port, a bridge member extending from said base frame portion through said port and having a hook shape at the exterior of said cavity turned back with the turned end of the hook shape joined to the front surface of said face plate portion at the base of said port, and a ramp element on said bridge member for receiving the flat of a D-shaft and camming the D-shaft during axial insertion into said cage through the second open end thereof to press the cylindrical portion of the D-shaft against the bottom of said roof structure before the end of the D-shaft moves into abutment with the inner surface of the gable, said bridge member being sufficiently resilient to maintain a bias on said ramp against the D-shaft flat and thereby maintain the D-shaft in tight engagement with the roof structure and interlock the knob with the D-shaft for rotary movement therewith.

Claim 7

A knob for turning a shaft comprised of a unitary molded body defining a front face and a receiver section which includes a ramp, a resilient bridge of a floor frame attached to said ramp, a roof section, side frames attaching said roof section to said floor frame, a gable attached to said roof section on said front face of said knob, ribs located within said knob for positioning said receiver section, said ramp prohibiting rotation of said shaft relative to said knob and urging said shaft against said roof section of said receiver, and said gable limiting axial movement of said shaft into said receiver.

Claim 8

A knob for turning a shaft comprised of a unitary molded body defining a front face and a receiver section which includes a ramp, a resilient bridge of a floor frame attached to said ramp, a roof section, side frames attaching said roof section to said floor frame, a gable attached to said roof section on said front face of said knob, ribs located within said knob for positioning said receiver section, said ramp prohibiting rotation of said shaft relative to said knob and urging said shaft against said roof section of said receiver, and said gable limiting axial movement of said shaft into said receiver.