Clutch knob for a clutch mechanism for a radio receiver with tuning device

A radio receiver with tuning device comprising:

• a receiver for receiving a radio frequency broadcast signal,
• a demodulator for extracting an audio signal from said broadcast signal received by said receiver;
• audio signal amplifying means for amplifying and outputting said audio signal extracted by said demodulator;
• said receiver comprises a ganged air capacitor with manual tuning means for adjusting the broadcast reception frequency thereof;
• said manual tuning means comprises a rotatable control shaft for manual adjustment of the value of said ganged air capacitor;
• said control shaft is connected to a clutch knob;
• said clutch knob comprises a body portion and a cover portion;
• said body portion comprises a base and a plurality of flexible sweeper arms which are attached to said base;
• said cover portion comprises an inner circumference having a plurality of serrations formed thereon, and an outer circumference;
• said plurality of serrations form a plurality of continuous and alternating troughs and crests;
• said cover portion is coupled to said base portion so that said plurality of flexible sweeper arms of said base portion interface with said plurality of serrations so as to provide a predetermined resistance which acts to allow transmission of rotational forces on said cover portion to said base portion and onto said control shaft of said ganged air capacitor;
• and
• wherein said rotational force applied to said cover portion exceeds the predetermined resistance between said interface of said plurality of flexible sweeper arms and said plurality of serrations with said force not being transmitted to said base portion.