Tuning device

Abstract

A tuning device has a dial drum rotatably supported in a frame, and a rheostat operatively connected to the dial drum. A knob is disposed in alignment with the dial drum. The dial drum has an outer toothing formed on the periphery thereof. A drive gear is secured to the knob, and a reduction gear train is disposed between the drive gear and the outer toothing for transmitting the rotation of the drive gear to the dial drum.

What is claimed is: 
     
       1. A tuning device comprising: a frame;   a dial drum, rotatably supported in said frame, said dial drum having characters for tuning and having an outer toothing formed on the periphery thereof;   a rheostat operatively connected to said dial drum; .Iadd.for being tuned upon rotation of said dial drum; .Iaddend.   a knob having the rotational axis thereof in alignment with the rotational axis of said dial drum;   a drive gear co-axially secured to said knob and rotatably supported in said dial drum; and   a gear reduction train disposed between said drive gear and said outer toothing for transmitting the rotation of the drive gear to said drum, said gear reduction train comprising:   a large diameter gear engaged with said drive gear.[.;.]..Iadd., and .Iaddend.   a small diameter gear .[.engaged with said large diameter gear and disposed.]. in an integral relationship with said large diameter gear .Iadd.and engaged with said outer toothing   whereby the axis of rotation of each gear is parallel to the axis of rotation of said knob.   
     
     
       2. A tuning device comprising: a frame;   a dial drum, rotatably supported in said frame, said dial drum having characters for tuning and having an outer toothing formed on the periphery thereof;   a rheostat operatively connected to said dial drum;   a supporting plate;   a knob disposed external to said supporting plate such that the rotational axis thereof is in alignment with the rotational axis of said dial drum;   a drive gear co-axially secured to said knob and rotatably supported in said dial drum and said supporting plate;   a gear reduction train disposed between said drive gear and said outer toothing for transmitting the rotation of the drive gear to said dial drum.   
     
     
       3. A tuning device comprising: a frame;   a dial drum, rotatably supported in said frame, said dial drum having characters for tuning and having an outer toothing formed on the periphery thereof;   a rheostat operatively connected to said dial drum .Iadd.for being tuned upon rotation of said dial drum.Iaddend.;   a supporting plate;   a knob disposed external to said supporting plate such that the rotational axis thereof is in alignment with the rotational axis of said dial drum;   a drive gear co-axially secured to said knob and rotatably supported in said dial drum and said supporting plate; and   a gear reduction train disposed between said drive gear and said outer toothing for transmitting the rotation of the drive gear to said dial drum, said gear reduction train comprising:   a large diameter gear engaged with said drive gear.[.;.]..Iadd., and .Iaddend.   a small diameter gear .[.engaged with said large diameter gear and.]. disposed in an integral relationship with said large diameter gear .Iadd.and engaged with said outer toothing.Iaddend..