ELECTRONIC CONTROL DEVICE FOR INTERMITTENT OPERATION OF A WINDSCREEN WIPER, PARTICULARLY FOR MOTOR VEHICLES

An adjustable electronic timing device for controlling the operating speed of windscreen wipers. A switch is provided for operating the wipers in either a continuous or an intermittent fashion. During intermittent operation, a programmable unijunction transistor (PUT) is caused to conduct to trigger...

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Bibliographic Details
Main Authors VIVIANI G,IT, CARTABIA L,IT, BASSO E,IT
Format Patent
LanguageEnglish
Published 01.01.1974
Subjects
PERFORMING OPERATIONS
SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, ORMANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
TRANSPORTING
VEHICLES IN GENERAL
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Summary:An adjustable electronic timing device for controlling the operating speed of windscreen wipers. A switch is provided for operating the wipers in either a continuous or an intermittent fashion. During intermittent operation, a programmable unijunction transistor (PUT) is caused to conduct to trigger an SCR which is connected in circuit to the wiper motor. A capacitor is charged during each wiping cycle and discharges at the termination of each wiping cycle to prevent retriggering of the SCR until the capacitor is fully discharged. The wiper operating frequency is adjusted by adjusting the resistivity of the discharge path for the capacitor. A braking circuit is provided for dynamic braking of the wiper motor.
Bibliography:Application Number: USD3783362