Multiple push button switch speed control system

Claim 2

A speed control for a universal electric motor connected across a source of alternating curreNt comprising, an armature, a plurality of co-wound field coils on both sides of said armature having differing impedances, switch means for selectively connecting said field coil windings to said source in different permutations of series and parallel connections upon one side of the armature to change the impedance of the field coil turns with respect to the armature and to a predetermined number of low impedance field coil windings on the other side of said armature with each switch position, a half wave rectifier, selective switch means to connect said rectifier in series relationship with said switches to vary the electrical potential impressed across the armature, and an additional field coil winding in series with said rectifier as a unit therewith to increase the effective impedance of said field coils.

Claim 3

The speed control called for in claim 1 in which said additional field coil winding is connected in series with said field coil windings on said other side of the armature, and said selective switch means shunts said rectifier and additional field coil winding.

Claim 4

A speed control for a universal electric motor connected across a source of alternating current comprising, an armature, a plurality of co-wound field coils magnetically effective on both sides of said armature having differing impedances, switch means rated to carry low current conducted by the coils for selectively connecting said field coil windings to said source in different permutations of series and parallel connections upon one side of the armature to change the impedance of the field coil turns with respect to the armature and to a predetermined number of low impedance field coil windings on the other side of said armature with each switch position, a half wave rectifier an additional field coil winding in series with said rectifier as a unit therewith to increase the effective impedance of said field coils, selective switch means to connect said rectifier in series relationship with said switches to vary the electrical potential impressed across the armature, and a timer operable from half wave pulse power connected in series with said half wave rectifier and said source of alternating current for a main run down when timer switch is opened before the main switch.

Claim 5

A speed control for a universal electric motor connected across a source of alternating current comprising, an armature, a plurality of co-wound field coils magnetically effective on both sides of said armature having differing impedances, switch means rated to carry low current conducted by the coils for selectively connecting said field coil windings to said source in different permutations of series and parallel connections upon one side of the armature to change the impedance of the field coil turns with respect to the armature and to a predetermined number of low impedance field coil windings on the other side of said armature with each switch position, a half wave rectifier an additional field coil winding in series with said rectifier as a unit therewith to increase the effective impedance of said field coils, selective switch means to connect said rectifier in series relationship with said switches to vary the electrical potential impressed across the armature, and a timer operable from half wave pulse power connected in series with said half wave rectifier and said source of alternating current for a main run down when timer switch is opened before the main switch.

Claim 6

A speed control system for a universal electric motor connectable across a source of alternating current comprising: an armature, a plurality of field coils of differing impedances disposed on one side of the armature, first selective switch means to connect the field coils in series between the armature and one side of said source, second selective switch means to connect like ends of each coil independently to said one side of said source for connecting at least two of said coils in parallel, connector means having connections connecting the other ends of said coils separately and to the armature and including switches in at least two of said connections for selecting the coils that will be connected in parallel between said armature and said one side of said source, and field coil means including an additional coil and a rectifier serially connected therewith as a unit and a switch shunting said rectifier and coil.

Claim 7

A speed control system for a universal electric motor connectable across a source of alternating current comprising: an armature, a plurality of field coils of differing impedances disposed on one side of the armature, first selective switch means to connect the field coils in series between the armature and one side of said source, second selective switch means to connect like ends of each coil independently to said one side of said source for connecting at least two of said coils in parallel, connector means having connections connecting the other ends of said coils separately and to the armature and including switches in at least two of said connections for selecting the coils that will be connected in parallel between said armature and said one side of said source, and field coil means including an additional coil and a rectifier serially connected therewith as a unit and a switch shunting said rectifier and coil.

Claim 8

A speed control for a universal electric motor connected across a source of alternating current comprising, an armature, a plurality of co-wound field coils on both sides of said armature having differing impedances, and switch means for selectively connecting said field coil windings to said source in different permutations of series and parallel connections upon one side of the armature to change the composite impedance of the field coil turns with respect to the armature and to a predetermined number of low impedance field coil windings on the other side of said armature with each switch position, a half wave rectifier, selective switch means to connect said rectifier in series relationship with saiD switches to vary the electrical potential impressed across the armature, an additional field coil winding connected in series with said rectifier as a unit therewith to increase the effective impedance of said field coils, said permutating switch means being rated to conduct only the current consumed by said coils, and wherein additional switch means are provided serially connected between said field coils and said source for interrupting current flow through said coils while said permutating switch means are switching said coils from one permutation to another.

Claim 9

A speed control for a universal electric motor connected across a source of alternating current comprising, an armature, a plurality of co-wound field coils on both sides of said armature having differing impedances, and switch means for selectively connecting said field coil windings to said source in different permutations of series and parallel connections upon one side of the armature to change the composite impedance of the field coil turns with respect to the armature and to a predetermined number of low impedance field coil windings on the other side of said armature with each switch position, a half wave rectifier, selective switch means to connect said rectifier in series relationship with saiD switches to vary the electrical potential impressed across the armature, an additional field coil winding connected in series with said rectifier as a unit therewith to increase the effective impedance of said field coils, said permutating switch means being rated to conduct only the current consumed by said coils, and wherein additional switch means are provided serially connected between said field coils and said source for interrupting current flow through said coils while said permutating switch means are switching said coils from one permutation to another.

Claim 10

The speed control described in claim 5 wherein said permutating switch means comprise a multiple push button switch having a push button switch and push button station for each permutation, and wherein said additional switch means interrupt said current upon actuation of one or more of said push button stations.