Valve-operating mechanism and sparker-operating mechanism in combination and either with or without speed-controlling mechanism. In such of the devices occurring in this subclass as include speed-controlling mechanism the speed-regulator is frequently of the charge-omitting type, and the combined valve and sparker operating mechanism then takes the form of means operating to interrupt the operation of the igniting device of the engine while the supply of combustible charges thereto is suspended. The valve acted upon may be the supply, exhaust, fuel, or other valve upon which the operation of the engine depends, and the sparking device is always of the make-and-break type, hereinafter defined.
(1) Note. This subclass does not include devices in which the only connection between the valve-operating mechanism and the igniting device is that the valve-operating mechanism controls a circuit-closing device, whereby a circuit included in the sparking device is controlled. Such devices are classified in subclass 146.5, in this class.
