US3919612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interval windshield wiper arrangement
Assignee: Robert Bosch GmbH
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Filing: 1974-03-22
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Granted: 1975-11-11
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Expires: 1994-03-22
Abstract
Abstract The arrangement includes a windshield wiper drive motor and a source of electrical energy. A relay includes a relay winding connected to the source for energization thereby and includes an associated relay switch operative when the relay winding becomes energized for connecting the motor to the source to initiate motor operation. A temperature-dependent blocking unit is operative when above a predetermined temperature for preventing energization of the relay winding, and is operative when below a predetermined temperature for permitting energization of the relay winding. A wiper-position-dependent switch arrangement is operative when the wiper leaves a predetermined end position thereof for deenergizing the relay winding and establishing a heating current path for the flow of a heating current to heat up the blocking unit, and is operative when the wiper reaches the end position thereof for interrupting the heating current path so as to initiate cooling of the blocking unit. Thus the wiper remains in the end position while the blocking unit cools down. After elapse of a sufficient cooling time interval, the blocking means reassumes a temperature sufficiently low to permit renewed energization of the relay winding, and accordingly renewed operation of the wiper drive motor.
Inventors
- 👤 Rudiger Ratzel
- 👤 Helmut Steinmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:52
CPC Classifications
B; B60; B60S; B60S1/00; B60S1/02; B60S1/04; B60S1/06; B60S1/08; B60S1/0803; B60S1/0807; B60S1/0811; Y; Y10; Y10S; Y10S318/00; Y10S318/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
246 words
In an interval windshield wiper arrangement, in combination, a windshield wiper drive motor; a source of electrical energy; a relay comprised of a relay winding having one terminal connected to said source for energization thereby and to be maintained thereby at a first predetermined potential a second terminal and including an associated relay switch operative when said winding becomes energized for connecting said motor to said source to initiate motor operation; temperature-dependent blocking means connected to said second terminal and operative when above a predetermined temperature for preventing energization of said winding and operative when below a predetermined temperature for permitting energization of said winding; and wiper-positiondependent switch means including means operative when the wiper leaves a predetermined end position thereof for applying to said second terminal of said relay winding a potential such that the voltage drop across said relay winding will become sufficient to maintain said relay winding energized, and for establishing a heating current path for the flow of a heating current to heat up said blocking means, and operative when the wiper reaches said end position for interrupting said heating current path to initiate cooling of said blocking means, whereby after elapse of a sufficient cooling time interval the blocking means reassumes a temperature permitting renewed energization of said relay winding, said wiper position-dependent switch means comprising means operative when the wiper reaches said end position for establishing a braking current path for the flow of braking current out of said motor.
Claim 2
Dependent Claim
246 words
In an interval windshield wiper arrangement, in combination, a windshield wiper drive motor; a source of electrical energy; a relay comprised of a relay winding having one terminal connected to said source for energization thereby and to be maintained thereby at a first predetermined potential a second terminal and including an associated relay switch operative when said winding becomes energized for connecting said motor to said source to initiate motor operation; temperature-dependent blocking means connected to said second terminal and operative when above a predetermined temperature for preventing energization of said winding and operative when below a predetermined temperature for permitting energization of said winding; and wiper-positiondependent switch means including means operative when the wiper leaves a predetermined end position thereof for applying to said second terminal of said relay winding a potential such that the voltage drop across said relay winding will become sufficient to maintain said relay winding energized, and for establishing a heating current path for the flow of a heating current to heat up said blocking means, and operative when the wiper reaches said end position for interrupting said heating current path to initiate cooling of said blocking means, whereby after elapse of a sufficient cooling time interval the blocking means reassumes a temperature permitting renewed energization of said relay winding, said wiper position-dependent switch means comprising means operative when the wiper reaches said end position for establishing a braking current path for the flow of braking current out of said motor.
Claim 3
Dependent Claim
22 words
An arrangement as defined in claim 1, wherein said temperature-dependent blocking means is connected in the current path of said relay winding.
Claim 4
Dependent Claim
182 words
In an interval windshield wiper arrangement, in combination, a windshield wiper drive motor; a source of electrical energy; a relay comprised of a relay winding connected to said source for energization thereby and comprised of an associated relay switch operative when said winding becomes energized for connecting said motor to said source to initiate motor operation; temperature-dependent blocking means including a positive-temperature-coefficient resistor connected in the current path of said relay winding, said blocking means being operative when above a predetermined temperature for preventing energization of said winding and operative when below a predetermined temperature for permitting energization of said winding; and wiper-position-dependent switch means operative when the wiper leaves a predetermined end position thereof for deenergizing said winding and establishing a heating current path for the flow of a heating current to heat up said blocking means, and operAtive when the wiper reaches said end position for interrupting said heating current path to initiate cooling of said blocking means, whereby after elapse of a sufficient cooling time interval the blocking means reassumes a temperature permitting renewed energization of said relay winding.
Claim 5
Dependent Claim
182 words
In an interval windshield wiper arrangement, in combination, a windshield wiper drive motor; a source of electrical energy; a relay comprised of a relay winding connected to said source for energization thereby and comprised of an associated relay switch operative when said winding becomes energized for connecting said motor to said source to initiate motor operation; temperature-dependent blocking means including a positive-temperature-coefficient resistor connected in the current path of said relay winding, said blocking means being operative when above a predetermined temperature for preventing energization of said winding and operative when below a predetermined temperature for permitting energization of said winding; and wiper-position-dependent switch means operative when the wiper leaves a predetermined end position thereof for deenergizing said winding and establishing a heating current path for the flow of a heating current to heat up said blocking means, and operAtive when the wiper reaches said end position for interrupting said heating current path to initiate cooling of said blocking means, whereby after elapse of a sufficient cooling time interval the blocking means reassumes a temperature permitting renewed energization of said relay winding.
Claim 6
Dependent Claim
92 words
An arrangement as defined in claim 3, wherein said wiper-position-dependent switch means comprises a two-position switch comprised of a work contact connected to said source to be maintained at a predetermined potential thereby, a rest contact connected to said motor, and a wiper-position-dependent switch member which electrically engages said rest contact when the wiper is in the end position thereof and which electrically engages said work contact when the wiper leaves the end position thereof, and wherein said wiper-position-dependent switch member is electrically connected to said second terminal of said relay winding.
Claim 7
Dependent Claim
29 words
An arrangement as defined in claim 4, further including a diode, said wiper-position-dependent switch member being electrically connected to said second terminal of said relay winding by said diode.
Claim 8
Dependent Claim
117 words
An arrangement as defined in claim 3, wherein said drive motor has two motor terminals one of which is connected to ground and the other of which is connectable via said relay switch to said source, and wherein said positive-temperature-coefficient resistor has one terminal connected to said second terminal of said relay winding and an other terminal connected to ground, and wherein said blocking means further includes an additional positive-temperature coefficient resistor having one terminal connected to ground and another terminal connected to said one of said two motor terminals, said positive-temperature-coefficient resistors being in heat-exchanging relationship with each other, and said additional positive-temperature coefficient resistor having a higher threshold temperature than the other of said resistors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |