Motor speed control device

Claim 1

An apparatus for controlling the speed of a direct current motor, comprising in combination: a. an electrical circuit, including a source of direct electrical current; b. a motor disposed in the circuit, said motor having a shaft rotatable in response to direct electrical current in the circuit; c. a capacitor disposed in electrical communication with the motor for sending pulsations of direct electrical current to the motor as the capacitor discharges; and d. means for alternately closing and opening the circuit more than once for every revolution of the shaft to charge and discharge the capacitor.

Claim 2

An apparatus for controlling the speed of a direct current motor, comprising in combination: a. an electrical circuit, including a source of direct electrical current; b. a motor disposed in the circuit, said motor having a shaft rotatable in response to direct electrical current in the circuit; c. a capacitor disposed in electrical communication with the motor for sending pulsations of direct electrical current to the motor as the capacitor discharges; and d. means for alternately closing and opening the circuit more than once for every revolution of the shaft to charge and discharge the capacitor.

Claim 11

An apparatus for controlling the speed of a direct current motor, comprising in combination: a. a motor disposed in electrical communication with a source of direct electrical current and operated by current therefrom, said motor having a rotatable shaft extending therefrom; b. a rotor concentrically coupled to the shaft for rotation therewith, said rotor having a plurality of configured cam surfaces equidistantly spaced from the shaft; c. a first breaker point reciprocable through a predetermined distance relative to the number and configuration of the cam surfaces; d. means associated with said first breaker point for riding engagement on the cam surfaces of said rotor to reciprocate said point in response to rotation of said rotor; e. a second breaker point disposed in spaced relation from said first breaker point for interrupting contacting relation with said first breaker point as it reciprocates; f. means for moving the second breaker point towards and away from the first breaker point to vary the spacing between the breaker points; and g. a capacitor disposed in electrical communication with said motor and charged and discharged as said points move into and out of contact.

Claim 12

An apparatus for controlling the speed of a direct current motor, comprising in combination: a. a motor disposed in electrical communication with a source of direct electrical current and operated by current therefrom, said motor having a rotatable shaft extending therefrom; b. a rotor concentrically coupled to the shaft for rotation therewith, said rotor having a plurality of configured cam surfaces equidistantly spaced from the shaft; c. a first breaker point reciprocable through a predetermined distance relative to the number and configuration of the cam surfaces; d. means associated with said first breaker point for riding engagement on the cam surfaces of said rotor to reciprocate said point in response to rotation of said rotor; e. a second breaker point disposed in spaced relation from said first breaker point for interrupting contacting relation with said first breaker point as it reciprocates; f. means for moving the second breaker point towards and away from the first breaker point to vary the spacing between the breaker points; and g. a capacitor disposed in electrical communication with said motor and charged and discharged as said points move into and out of contact.

Claim 16

An apparatus for controlling the speed of a direct current motor, comprising in combination: a. an electrical circuit; b. a motor disposed in the circuit and operable in response to direct electrical current in said circuit; c. means for alternately opening and closing the circuit to send pulsations of current to said motor, said means including a pair of spaced breaker points mounted for relative movement into and out of contacting relation; d. means for varying the frequency of closing the circuit, said means including a rotor mounted for unitary rotation on a shaft of the motor, said rotor having a plurality of cam surfaces equidistantly spaced from the shaft of the motor, and a cam follower carried by one of said pair of breaker points for riding engagement on said cam surfaces to reciprocate said one breaker point more than once for every revolution of the shaft of the motor; e. means for varying the period of time that the circuit is closed, said means including means for varying the spacing between the breaker points; and f. a capacitor disposed in the circuit and charged and discharged as the breaker points move into and out of contact.

Claim 17

An apparatus for controlling the speed of a direct current motor, comprising in combination: a. an electrical circuit; b. a motor disposed in the circuit and operable in response to direct electrical current in said circuit; c. means for alternately opening and closing the circuit to send pulsations of current to said motor, said means including a pair of spaced breaker points mounted for relative movement into and out of contacting relation; d. means for varying the frequency of closing the circuit, said means including a rotor mounted for unitary rotation on a shaft of the motor, said rotor having a plurality of cam surfaces equidistantly spaced from the shaft of the motor, and a cam follower carried by one of said pair of breaker points for riding engagement on said cam surfaces to reciprocate said one breaker point more than once for every revolution of the shaft of the motor; e. means for varying the period of time that the circuit is closed, said means including means for varying the spacing between the breaker points; and f. a capacitor disposed in the circuit and charged and discharged as the breaker points move into and out of contact.

Claim 18

An apparatus for controlling the speed of a direct current motor, comprising in combination: a. an electrical circuit; b. a motor disposed in the circuit and operable in response to direct electrical current in said circuit; c. means for alternately opening and closing the circuit to send pulsations of current to said motor, said means including a pair of spaced breaker points mounted for relative movement into and out of contacting relation; d. means for varying the frequency of closing the circuit, said means including means coupled to the shaft of the motor for reciprocating at least one of said pair of breaker points through a predetermined arc unless interrupted by the other of said pair of breaker points and at a frequency greater than once for every revolution of the shaft of the motor; e. means for varying the period of time that the circuit is closed, including means for varying the spacing between the breaker points; and f. a capacitor disposed in the circuit and charged and discharged as the breaker points move into and out of contact.

Claim 19

An apparatus for controlling the speed of a direct current motor, comprising in combination: a. an electrical circuit; b. a motor disposed in the circuit and operable in response to direct electrical current in said circuit; c. means for alternately opening and closing the circuit to send pulsations of current to said motor, said means including a pair of spaced breaker points mounted for relative movement into and out of contacting relation; d. means for varying the frequency of closing the circuit, said means including means coupled to the shaft of the motor for reciprocating at least one of said pair of breaker points through a predetermined arc unless interrupted by the other of said pair of breaker points and at a frequency greater than once for every revolution of the shaft of the motor; e. means for varying the period of time that the circuit is closed, including means for varying the spacing between the breaker points; and f. a capacitor disposed in the circuit and charged and discharged as the breaker points move into and out of contact.