Patent ID: 6864455

Claim:
A function switch adapted to be mounted on an apparatus for selecting a predetermined function, the function switch comprising: an external knob having an outer periphery which is adapted to be turned by a user so as to select the predetermined function; a knob base connected to a bottom portion of said external knob so as to be co-rotatable therewith; a stationary switch seat adapted to be mounted securely on the apparatus, and disposed around said knob base in such a manner that said external knob is disposed on an upper surface of said stationary switch seat, said stationary switch seat having a lower surface that is opposite to said upper surface and that is formed with a plurality of spaced apart pitches, an adjacent pair of said pitches defining an arcuate traveling path therebetween; a fastener; and a resilient spring member having a mounting portion fixed on a lower surface of said knob base by said fastener, and an extension portion extending resiliently angularly from said mounting portion and formed with an engaging tongue that bias slidably and resiliently against said arcuate traveling path, thereby preventing upward removal of said external knob from said stationary switch base, said external knob generating a clicking sound by virtue of collision of said engaging tongue against a respective one of said pitches according to co-turning of said external knob, said knob base and said spring member with respect to said stationary switch seat when said external knob is turned to the predetermined function.