Windscreen wiper comprising a protection device for the...

Details Windscreen wiper comprising a protection device for the... Windscreen wiper comprising a protection device for the...

2005-12-13

2010-10-19

Ro, Bentsu (Department: 2837)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

C361S018000, C361S023000, C361S033000, C318S434000

Reexamination Certificate

active

07817383

ABSTRACT:
A windscreen wiper, including a protection device for an electric motor for drive thereof, and corresponding method. The windscreen wiper includes a DC motor with first, second, and third carbon contacts rubbing on a rotor thereof. The first carbon contact is ground, the second is selectively connected to a DC current supply, and the third is connected to neither the ground nor the DC current supply. A sub-assembly for detection of sticking of the electric motor provides information on the sticking of the motor. A voltage measuring device between the first and the third carbon contacts permits taking a first measured voltage value that is compared to a first threshold value to generate further second information on the sticking of the electric motor if the voltage is lower than the first threshold value.

REFERENCES:
patent: 5630009 (1997-05-01), Hayden
patent: 5867000 (1999-02-01), Thornton
patent: 101 57 386 (2003-06-01), None
patent: 0 803 413 (1997-10-01), None

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