Motor speed control device

In combination:

• a. a first electrical circuit, including a source of direct electrical current;
• b. a first motor disposed in the first circuit and wired in series with the source therein and operable by current therefrom;
• c. a second electrical circuit, including a source of direct electrical current;
• d. a second motor disposed in the second circuit and wired in series with the source therein and operable by current from the source therein when the second circuit is closed;
• e. a switching mechanism wired in series with the second motor and source of direct electrical current in the second circuit, said mechanism including a pair of electrical contacts for opening and closing the circuit;
• f. means for pivotally mounting the first of said pair of electrical contacts for reciprocating through a predetermined arc;
• g. means for mounting the second of said pair of electrical contacts for movement to and from the first reciprocable contact, to vary the dwell between said contacts;
• h. means coacting with the first motor for reciprocating said first contact at least twice for every rotation of the shaft of said first motor, said means including (I) a rotor mounted on the shaft of the first motor for unitary rotation therewith, the rotor having at least two cam surfaces which are concentrically disposed about the longitudinal axis of the shaft of the first motor, and (II) a cam follower rideable on said cam surfaces for causing reciprocation of said first contact into and out of engagement with the second of said contacts as said cam follower rides on said cam surfaces;
• and
• i. a capacitor disposed in the second circuit and wired in parallel with the switching mechanism, such that the capacitor is charged and discharged as the second circuit is opened and closed.