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US3644744A Expired / Lapsed US ⏱️ 0.0 years remaining

Windscreen wiping systems for road vehicles

Assignee: ZF International UK Ltd
•
Filing: 1970-03-23
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Granted: 1972-02-22
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Expires: 1990-03-23
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Abstract

Abstract A windshield wiping system has a wiper motor and a control switch for the motor, the control switch having an on position and an off position in serving when moved to its off position to reverse the flow of current to the wiper motor to cause the wiper motor to move the wipers clear of the windshield at which point a limit switch is tripped to stop the motor. In such a system, means is provided for effecting a delay between wipes so that the system operates more satisfactorily in light rain, and in addition a further limit switch is incorporated to ensure that the wipers park on the windshield when they are operating with the delay.

Inventors

  • 👤 William David Holt

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 20:26
CPC Classifications
B; B60; B60S; B60S1/00; B60S1/02; B60S1/04; B60S1/06; B60S1/08; B60S1/0803; B60S1/0807

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 215 words
A windscreen wiping system for a road vehicle, including a wiper motor, a control switch for said motor, said control switch for said motor, said control switch having an on position and an off position, said control switch when in said on position operating said motor in one direction so that said wipers operate in a reciprocatory manner, and said control switch when in its off position reversing the flow of current to said wiper motor to cause said wiper motor to move the wipers clear of the windscreen of the vehicle, a first limit switch which is tripped to stop the motor when said wipers move clear of the windscreen of the vehicle, manually operable delay means serving to stop the wiper motor at the termination of a cycle of operation of said wipers and to recommence operation of said wiper motor after a delay, and a second limit switch operable by said manually operable delay means for parking said wipers on the screen when said manually operable delay means is operative in which means is provided for operating the wipers with a delay between each wipe or after a succession of wipes, and a further limit switch is incorporated whereby the wipers park on the screen when they are operating with a delay.
Claim 2
Dependent Claim 215 words
A windscreen wiping system for a road vehicle, including a wiper motor, a control switch for said motor, said control switch for said motor, said control switch having an on position and an off position, said control switch when in said on position operating said motor in one direction so that said wipers operate in a reciprocatory manner, and said control switch when in its off position reversing the flow of current to said wiper motor to cause said wiper motor to move the wipers clear of the windscreen of the vehicle, a first limit switch which is tripped to stop the motor when said wipers move clear of the windscreen of the vehicle, manually operable delay means serving to stop the wiper motor at the termination of a cycle of operation of said wipers and to recommence operation of said wiper motor after a delay, and a second limit switch operable by said manually operable delay means for parking said wipers on the screen when said manually operable delay means is operative in which means is provided for operating the wipers with a delay between each wipe or after a succession of wipes, and a further limit switch is incorporated whereby the wipers park on the screen when they are operating with a delay.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-02-21 1975-08-23 1976-02-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-02-21 1979-08-23 1980-02-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-02-21 1983-08-23 1984-02-22 $7700.00 Window Closed / Lapsed

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