| 摘要 |
A windshield wiper system comprises a wiper blade having two wiper lips extending in spaced parallel relationship. The wiper lips are interconnected at the ends thereof by further wiper lip portions to define a continuous seal cooperating with the surface of the windshield to be cleaned to define an essentially closed cavity. The latter communicates with cleaning liquid supply means adapted to completely fill said cavity and establish a positive pressure therein. An ultrasonic transducer assembly is acoustically coupled to the surface of the windshield by the mass of water contained in the cavity. By moving the wiper blade together with the ultrasonic transducer assembly across the windshield the dirt clinging to the surface of the windshield becomes detached and suspended in the cleaning liquid. Thus the dirt is most effectively removed.
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