Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1996-11-26
1998-07-28
Masih, Karen
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318443, 318444, 318483, 318DIG2, 307 91, 307 101, G05B 500
Patent
active
057866767
ABSTRACT:
In a control circuit for a vehicle windshield wiper system, a relay energization retaining circuit forms a self-sustaining circuit jointly with a relay drive transistor for driving a wiper relay, and maintains supply of electric current to the wiper motor when the ON signal for the relay drive transistor is terminated as long as the auto stop switch is at the brake position until the auto stop switch subsequently moves on to the drive position. Therefore, when the signal which normally turns on the relay drive transistor is terminated during the time the auto stop switch is at the brake position, because the relay energization retaining circuit keeps the wiper motor running until the auto stop switch changes over from the brake position to the drive position, and the auto stop switch then takes over the task of keeping the wiper motor running until the auto stop switch changes over from the drive position to the brake position, the termination of electric current to the wiper motor always occurs at the time when the auto stop switch changes over from the drive position to the brake position so that the distance or the angular range of the overrunning of the wiper motor is fixed without regard to the timing of terminating the ON signal. Thus, according to the present invention, the rest position of the wiper blade is fixed under all operating conditions.
REFERENCES:
patent: 3657618 (1972-04-01), Ori et al.
patent: 4306218 (1981-12-01), Leconte et al.
patent: 4881019 (1989-11-01), Shiraishi et al.
patent: 4929876 (1990-05-01), Kato
Ogawa Tomoyuki
Tsurubuchi Iwao
Masih Karen
Mitsuba Corporation
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