Bacon & Thomas, PLLC
Rotary switch
 A rotary switch has a rotary dial, an operation shaft, a housing, a rotary plate and a circuit board. A binding member extends from the rotary dial and inserts through a central through hole of the housing and connects to the contact plate to allow the rotary dial and the contact plate to rotate together. The housing and the circuit board attach and remain stationary, independent of any rotational movement of the rotary dial. The contact plate has a plurality of contact protrusions that extend in a predetermined pattern so that in accordance with rotation of the rotary dial, at least one contact protrusion is brought into electrical contact with at least one linear contact member belonging to a contact member array positioned on the circuit board. The rotary switch operates when a shaft contact portion mounted on the circuit board is pressed by a lower end of the operation shaft in accordance with axial movement of the operation shaft 
Shin Jiuh Corp.
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inventional inventional inventional
Chin-Wen
Chou