Abstract:
An interlocking pushbutton key switch is disclosed in which the interlocking slide bar has a lipped, toothed extension which engages in a rotatably mounted, coupling plate. Other rows of pushbuttons are constructed to operate similarly. Thus the operation of one button in any row interlocks with all other pushbuttons on the pushbutton key switch assembly.
Abstract:
An automatic mechanical reset mechanism is described for telephones having circuit selecting, push buttons on the face thereof. Upon the return of the receiver to the telephone cradle, the downward movement of the cradle forces a first lever arm to pivot about a shaft. A second lever arm connected to the same central hub as the first arm similarly rotates and transmits this rotation to a lever plate mechanism. The rotating lever plate communicates with the plate which keeps the button in the depressed condition. The rotation of the lever plate is converted to translational movement of the retention plate thereby releasing the depressed button.