Windshield wiper control circuit

Claim 2

A windshield wiper control circuit comprising in combination with a windshield wiper and an electric drive motor having an armature and at least a shunt field winding for driving the windshield wiper over a normal wipe pattern between inner and outer wipe positions; an electrical relay having an operating coil and normally open contacts; and energizing circuit for said relay operating coil including first, second and third circuit branches all connected to the same terminal end thereof; an energizing circuit for said motor shunt field winding; an energizing circuit for said motor armature including said normally open contacts of said relay in series; an electrical selector switch having a plurality of stationary contacts and two gang-operated movable contacts operable to at least Off, Run and Pulse positions, one of said movable contacts and one of said stationary contacts being connected in series in said first circuit branch of said relay operating coil energizing circuit and arranged to be in electrical circuit closed condition when said movable contacts are in said Off and Run positions and in the electrical circuit open condition when said movable contacts are in said Pulse position; a first electrical switching device having normally open current carrying elements electrically operable to the electrical circuit closed condition connected in series in said second circuit branch of said relay operating coil energizing circuit; a pulse control timing circuit activated while said movable contacts of said selector switch are operated to the Pulse position electrically coupled to said first electrical switching device for periodically operating said normally open current carrying elements thereof to the electrical circuit closed condition at spaced intervals whereby said second circuit branch of said relay operating coil is periodically Completed at spaced intervals, said pulse control timing circuit determining the repetition rate of said spaced intervals; a second electrical switching device having normally closed current carrying elements which are operated to the electrical circuit open condition when said windshield wiper is in said inner wipe position connected in series in said third circuit branch of said relay operating coil energizing circuit for closing said third circuit branch when said windshield wiper is moved away from said inner wipe position and for interrupting said third circuit branch when said windshield wiper is in said inner wipe position; and a power switching device having current carrying elements which operate to the electrical circuit closed condition in response to the operation of said movable contacts of said selector switch to either said Run position or said Pulse position connected in series in said motor shunt field winding energizing circuit, said motor armature energizing circuit and said relay operating coil energizing circuit whereby said drive motor is continuously energized while said movable contacts of said selector switch are in said Run position and said motor is periodically energized at spaced intervals while said movable contacts of said selector switch are in said Pulse position.

Claim 3

A windshield wiper control circuit comprising in combination with a windshield wiper, an electric drive motor having an armature and at least a shunt field winding for driving the windshield wiper over a normal wipe pattern between inner and outer wipe positions and a source of direct current potential having positive and negative polarity output terminals; an electrical relay having an operating coil and normally open contacts; an energizing circuit for said relay operating coil including first, second and third circuit branches through which a selected one terminal end thereof may be connected to a selected one of said output terminals of said source of direct current potential; an energizing circuit for said motor shunt field winding; an energizing circuit for said motor armature including said normally open contacts of said relay in series; an electrical selector switch having a plurality of stationary contacts and two gang-operated movable contacts operable to at least Off, Run and Pulse positions, one of said movable contacts and one of said stationary contacts being connected in series in said first circuit branch of said relay operating coil energizing circuit and arranged to be in electrical circuit closed condition when said movable contacts are in said Off and Run positions and in the electrical circuit open condition when said movable contacts are in said Pulse position; a transistor having normally open current carrying elements electrically operable to the electrical circuit closed condition connected in series in said second circuit branch of said relay operating coil energizing circuit; a pulse control timing circuit activated while said movable contacts of said selector switch are operated to the Pulse position electrically coupled to said transistor for periodically operating said normally open current carrying elements thereof to the electrical circuit closed condition at spaced intervals whereby said second circuit branch of said relay operating coil is periodically completed at spaced intervals, said pulse control timing circuit determining the repetition rate of said spaced intervals; an electrical switching device having normally closed current carrying elements which are operated to the electrical circuit open condition when said windshield wiper is in said inner wipe position connected in series in said third circuit branch of said relay operating coil energizing circuit for closing said third circuit branch when said winshield wiper is moved away from said inner wipe position and for interrupting said third circuit branch when said windshield wiper is in said inner wipe position; and a power switching device having current carrying elemEnts which operate to the electrical circuit closed condition in response to the operation of said movable contacts of said selector switch to either said Run position or said Pulse position connected in series in said motor shunt field winding energizing circuit, said motor armature energizing circuit and said relay operating coil energizing circuit whereby said drive motor is continuously energized while said movable contacts of said selector switch are in said Run position and said motor is periodically energized at spaced intervals while said movable contacts of said selector switch are in said Pulse position.

Claim 4

A windshield wiper control circuit comprising in combination with a windshield wiper, an electric drive motor having an armature and at least a shunt field winding for driving the windshield wiper over a normal wipe pattern between inner and outer wipe positions and a source of direct current potential having positive and negative polarity output terminals; an electrical relay having an operating coil and normally open contacts; an energizing circuit for said relay operating coil including first, second and third circuit branches through which a selected one terminal end thereof may be connected to a selected one of said output terminals of said source of direct current potential; an energizing circuit for said motor shunt field winding; an energizing circuit for said motor armature including said normally open contacts of said relay in series; an electrical selector switch having a plurality of stationary contacts and two gang-operated movable contacts operable to at least Off, Run and Pulse positions, one of said movable contacts and one of said stationary contacts being connected in series in said first circuit branch of said relay operating coil energizing circuit and arranged to be in electrical circuit closed condition when said movable contacts are in said Off and Run positions and in the electrical circuit open condition when said movable contacts are in said Pulse position; a transistor having normally open current carrying elements electrically operable to the electrical circuit closed condition connected in series in said second circuit branch of said relay operating coil energizing circuit; a pulse control timing circuit activated while said movable contacts of said selector switch are operated to the Pulse position electrically coupled to said transistor for periodically operating said normally open current carrying elements thereof to the electrical circuit closed condition at spaced intervals whereby said second circuit branch of said relay operating coil is periodically completed at spaced intervals, said pulse control timing circuit determining the repetition rate of said spaced intervals; an electrical switching device having normally closed current carrying elements which are operated to the electrical circuit open condition when said windshield wiper is in said inner wipe position connected in series in said third circuit branch of said relay operating coil energizing circuit for closing said third circuit branch when said winshield wiper is moved away from said inner wipe position and for interrupting said third circuit branch when said windshield wiper is in said inner wipe position; and a power switching device having current carrying elemEnts which operate to the electrical circuit closed condition in response to the operation of said movable contacts of said selector switch to either said Run position or said Pulse position connected in series in said motor shunt field winding energizing circuit, said motor armature energizing circuit and said relay operating coil energizing circuit whereby said drive motor is continuously energized while said movable contacts of said selector switch are in said Run position and said motor is periodically energized at spaced intervals while said movable contacts of said selector switch are in said Pulse position.

Claim 5

A windshield wiper control circuit comprising in combination with a windshield wiper, an electric drive motor having an armature and at least a shunt field winding for driving the windshield wiper over a normal wipe pattern between inner and outer wipe positions and a source of direct current potential having positive and negative polarity output terminals; an electrical relay having an operating coil and normally open contacts; an energizing circuit for said relay operating coil including first, second and third circuit branches through which a selected one terminal end thereof may be connected to a selected one of said output terminals of said source of direct current potential; an energizing circuit for said motor shunt field winding; an energizing circuit for said motor armature including said normally open contacts of said relay in series; and electrical selector switch haiving a plurality of stationary contacts and two gang-operated movable contacts operable to at least Off, Run, and Pulse positions; means for connecting one of said movable contacts and one of said stationary contacts of said selector switch in series in said first circuit branch of said relay operating coil energizing circuit and arranged to be in electrical circuit closed condition when said movable contacts are in said Off and Run positions and in the electrical circuit open condition when said movable contacts are in said Pulse position; a transistor Darlington pair having normally open current carrying elements electrically operable to the electrical circuit closed condition connected in series in said second circuit branch of said relay operating coil energizing circuit; a pulse control timing circuit including the series combination of a variable resistance and a capacitor activated while said movable contacts of said selector switch are operated to the Pulse position electrically coupled to said transistor Darlington pair for periodically operating said normally open current carrying elements thereof to the electrical circuit closed condition at spaced intervals whereby said second circuit branch of said relay operating coil is periodically completed at spaced intervals, said pulse control timing circuit determining the repetition rate of said spaced intervals; an electrical switching device having normally closed current carrying elements which are operated to the electrical circuit open condition when said winshield wiper is in said inner wipe position connected in sereis in said third circuit branch of said relay operating coil energizing circuit for closing said third circuit branch when said windshield wiper is moved away from said inner wipe position and for interrupting said third circuit branch when said windshield wiper is in said inner wipe position; and a power switching device having current carrying elements which operate to the electrical circuit closed condition in response to the operation of said movable contacts of said selector switch to either said Run position or said Pulse position connected in series in said motor shunt field winding energizing circuit, said motor armature energizing circuit and said relay operating coil energizing circuit whereby said drive motor is continuously energized while said movable contacts of said selector switch are in said Run position and said motor is periodically energized at spaced intervals while Said movable contacts of said selector switch are in said Pulse position.

Claim 6

A windshield wiper control circuit comprising in combination with a windshield wiper, an electric drive motor having an armature and at least a shunt field winding for driving the windshield wiper over a normal wipe pattern between inner and outer wipe positions and a source of direct current potential having positive and negative polarity output terminals; an electrical relay having an operating coil and normally open contacts; an energizing circuit for said relay operating coil including first, second and third circuit branches through which a selected one terminal end thereof may be connected to a selected one of said output terminals of said source of direct current potential; an energizing circuit for said motor shunt field winding; an energizing circuit for said motor armature including said normally open contacts of said relay in series; and electrical selector switch haiving a plurality of stationary contacts and two gang-operated movable contacts operable to at least Off, Run, and Pulse positions; means for connecting one of said movable contacts and one of said stationary contacts of said selector switch in series in said first circuit branch of said relay operating coil energizing circuit and arranged to be in electrical circuit closed condition when said movable contacts are in said Off and Run positions and in the electrical circuit open condition when said movable contacts are in said Pulse position; a transistor Darlington pair having normally open current carrying elements electrically operable to the electrical circuit closed condition connected in series in said second circuit branch of said relay operating coil energizing circuit; a pulse control timing circuit including the series combination of a variable resistance and a capacitor activated while said movable contacts of said selector switch are operated to the Pulse position electrically coupled to said transistor Darlington pair for periodically operating said normally open current carrying elements thereof to the electrical circuit closed condition at spaced intervals whereby said second circuit branch of said relay operating coil is periodically completed at spaced intervals, said pulse control timing circuit determining the repetition rate of said spaced intervals; an electrical switching device having normally closed current carrying elements which are operated to the electrical circuit open condition when said winshield wiper is in said inner wipe position connected in sereis in said third circuit branch of said relay operating coil energizing circuit for closing said third circuit branch when said windshield wiper is moved away from said inner wipe position and for interrupting said third circuit branch when said windshield wiper is in said inner wipe position; and a power switching device having current carrying elements which operate to the electrical circuit closed condition in response to the operation of said movable contacts of said selector switch to either said Run position or said Pulse position connected in series in said motor shunt field winding energizing circuit, said motor armature energizing circuit and said relay operating coil energizing circuit whereby said drive motor is continuously energized while said movable contacts of said selector switch are in said Run position and said motor is periodically energized at spaced intervals while Said movable contacts of said selector switch are in said Pulse position.

Claim 7

A windshield wiper control circuit comprising in combination with a windshield wiper, an electric drive motor having an armature and at least a shunt field winding for driving the windshield wiper over a normal wipe pattern between inner and outer wipe positions and a washer unit for delivering washer fluid to the windshield during a wash cycle when activated; an electrical relay having an operating coil and normally open contacts; an energizing circuit for said relay operating coil including first, second and third circuit branches all connected to the same terminal end thereof; an energizing circuit for said motor shunt field winding; an energizing circuit for said motor armature including said normally open contacts of said relay in series; an electrical selector switch having a plurality of stationary contacts and two gang-operated movable contacts operable to at least Off, Run and Pulse positions, one of said movable contacts and a first one of said stationary contacts being connected in series in said first circuit branch of said relay operating coil energizing circuit and arranged to be in electrical circuit closed condition when said movable contacts are in said Off and Run positions and in the electrical circuit open condition when said movable contacts are in said Pulse position; an electrical wash cycle switch of the momentary contact type having a plurality of stationary contacts and a movable contact operable to Off and Wash positions, said movable contact and a first one of said stationary contacts being connected in parallel with said one of said movable contacts and said first one of said stationary contacts of said selector switch in said first circuit branch of said relay operating coil energizing circuit and arranged to be in electrical circuit closed condition when said movable contact is in said Wash position and in the electrical circuit open condition when said movable contact is in said Off position and said movable contact and a second one of said stationary contacts being arranged to establish an activating circuit for said wash unit when said movable contact is in said Wash position; a first electrical switching device having normally open current carrying elements electrically operable to the electrical circuit closed condition connected in series in said second circuit branch of said relay operating coil energizing cirucit; a pulse control timing circuit activated while said movable contacts of said selector switch are operated to the Pulse position electrically coupled to said first electrical switching device for periodically operating said normally open current carrying elements thereof to the electrical circuit closed condition at spaced intervals whereby said second circuit branch of said relay operating coil is periodically completed at spaced intervals, said pulse control timing circuit determining the repetition rate of said spaced intervals; a second electrical switching device having normally closed current carrying elements which are operated to the electrical circuit open condition when said windshield wiper is in said inner wipe position connected in series in said third circuit branch of said relay operating coil energizing circuit for closing said third circuit branch when said windshield wiper is moved away form said inner wipe position and for interrupting said third circuit branch when said windshield wiper is in said inner wipe position; a power switching device having an operating coil and current carrying elements which operate to the electrical circuit closed condition in response to the energization of said operating coil connected in series in said motor shunt field winding energizing circuit, said motor armature energizing circuit and said relay operating coil energizing circuit whereby said drive motor is continuously energized while said movable contacts of said selector switch are in said Run position and said motor is Periodically energized at speced intervals while said movable contacts of said selector switch are in said Pulse position, an energizing circuit for said operating coil of said power switching device including the parallel combination of said one of said movable contacts and a second one of said stationary contacts of said selector switch arranged to be in the electrical circuit closed condition when said movable contacts are in said Run and Pulse positions and said movable contact and a third one of said stationary contacts of said wash cycle switch arranged to be in the electrical circuit closed condition when said movable contact is in said Wash position; and a third electrical switching device having normally closed current carrying elements connected between said normally open contacts of said electrical relay and said second one of said stationary contacts and said one of said movable contacts of said selector switch which are operated to and maintained in the electrical circuit open condition when said washer unit has completed a wash cycle for maintaining an energizing circuit for said operating coil of said power switching device during each wash cycle when said movable contacts of said selector switch are in said Off position and for maintaining said motor armature energizing circuit during each wash cycle when said movable contacts of said selector switch are in said Pulse position.

Claim 8

A windshield wiper control circuit comprising in combination with a windshield wiper, an electric drive motor having an armature and at least a shunt field winding for driving the windshield wiper over a normal wipe pattern between inner and outer wipe positions and a washer unit for delivering washer fluid to the windshield during a wash cycle when activated; an electrical relay having an operating coil and normally open contacts; an energizing circuit for said relay operating coil including first, second and third circuit branches all connected to the same terminal end thereof; an energizing circuit for said motor shunt field winding; an energizing circuit for said motor armature including said normally open contacts of said relay in series; an electrical selector switch having a plurality of stationary contacts and two gang-operated movable contacts operable to at least Off, Run and Pulse positions, one of said movable contacts and a first one of said stationary contacts being connected in series in said first circuit branch of said relay operating coil energizing circuit and arranged to be in electrical circuit closed condition when said movable contacts are in said Off and Run positions and in the electrical circuit open condition when said movable contacts are in said Pulse position; an electrical wash cycle switch of the momentary contact type having a plurality of stationary contacts and a movable contact operable to Off and Wash positions, said movable contact and a first one of said stationary contacts being connected in parallel with said one of said movable contacts and said first one of said stationary contacts of said selector switch in said first circuit branch of said relay operating coil energizing circuit and arranged to be in electrical circuit closed condition when said movable contact is in said Wash position and in the electrical circuit open condition when said movable contact is in said Off position and said movable contact and a second one of said stationary contacts being arranged to establish an activating circuit for said wash unit when said movable contact is in said Wash position; a first electrical switching device having normally open current carrying elements electrically operable to the electrical circuit closed condition connected in series in said second circuit branch of said relay operating coil energizing cirucit; a pulse control timing circuit activated while said movable contacts of said selector switch are operated to the Pulse position electrically coupled to said first electrical switching device for periodically operating said normally open current carrying elements thereof to the electrical circuit closed condition at spaced intervals whereby said second circuit branch of said relay operating coil is periodically completed at spaced intervals, said pulse control timing circuit determining the repetition rate of said spaced intervals; a second electrical switching device having normally closed current carrying elements which are operated to the electrical circuit open condition when said windshield wiper is in said inner wipe position connected in series in said third circuit branch of said relay operating coil energizing circuit for closing said third circuit branch when said windshield wiper is moved away form said inner wipe position and for interrupting said third circuit branch when said windshield wiper is in said inner wipe position; a power switching device having an operating coil and current carrying elements which operate to the electrical circuit closed condition in response to the energization of said operating coil connected in series in said motor shunt field winding energizing circuit, said motor armature energizing circuit and said relay operating coil energizing circuit whereby said drive motor is continuously energized while said movable contacts of said selector switch are in said Run position and said motor is Periodically energized at speced intervals while said movable contacts of said selector switch are in said Pulse position, an energizing circuit for said operating coil of said power switching device including the parallel combination of said one of said movable contacts and a second one of said stationary contacts of said selector switch arranged to be in the electrical circuit closed condition when said movable contacts are in said Run and Pulse positions and said movable contact and a third one of said stationary contacts of said wash cycle switch arranged to be in the electrical circuit closed condition when said movable contact is in said Wash position; and a third electrical switching device having normally closed current carrying elements connected between said normally open contacts of said electrical relay and said second one of said stationary contacts and said one of said movable contacts of said selector switch which are operated to and maintained in the electrical circuit open condition when said washer unit has completed a wash cycle for maintaining an energizing circuit for said operating coil of said power switching device during each wash cycle when said movable contacts of said selector switch are in said Off position and for maintaining said motor armature energizing circuit during each wash cycle when said movable contacts of said selector switch are in said Pulse position.