Patent US3774091A successfully refreshed from Google Patents.
US3774091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intermittent windshield wiper system with electrodynamic braking
Assignee: Individual
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Filing: 1970-12-22
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Granted: 1973-11-20
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Expires: 1990-12-22
Abstract
Abstract This specification discloses an intermittent automotive windshield wiper system in which windshield wipers are driven in repeating wiping cycles, stopping for a dwell period at the end of each wiping cycle. The windshield wipers are driven by an electric motor having a permanent magnet field and the wipers are electrodynamically braked to a stop at the end of each wiping cycle. An automatic switch is provided to, in effect, assure that the braking circuit is open at the end of each dwell period when the motor armature is again energized so that DC power is not applied to the braking circuit in parallel with the motor armature at the end of each dwell period.
Inventors
- 👤 R Kearns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:54
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/12; B; B60; B60S; B60S1/00; B60S1/02; B60S1/04; B60S1/06; B60S1/08; B60S1/0803; B60S1/0807; Y; Y10; Y10S; Y10S318/00; Y10S318/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
103 words
In an intermittent windshield wiper system having an electric motor for driving windshield wipers through repeating wiping cycles and circuit means for energizing said motor to drive said wiper blades through repeating wiping cycles stopping said wiper blades for dwell periods at the ends of such successive wiping cycles, the improvement wherein said circuit means includes braking means to electrodynamically brake said motor to a stop at the ends of such successive wiping cycles, said braking means including a current path connected across the armature of said motor and switch means to open said current path automatically whenever said motor is not rotating.
Claim 2
Dependent Claim
103 words
In an intermittent windshield wiper system having an electric motor for driving windshield wipers through repeating wiping cycles and circuit means for energizing said motor to drive said wiper blades through repeating wiping cycles stopping said wiper blades for dwell periods at the ends of such successive wiping cycles, the improvement wherein said circuit means includes braking means to electrodynamically brake said motor to a stop at the ends of such successive wiping cycles, said braking means including a current path connected across the armature of said motor and switch means to open said current path automatically whenever said motor is not rotating.
Claim 3
Dependent Claim
16 words
In a system as defined in claim 1 wherein said switch means comprises an electronic valve.
Claim 4
Dependent Claim
57 words
In a system as recited in claim 1 wherein said motor has first, second and third brushes and wherein said circuit means energizes said motor between said second and third brushes to cause said motor to drive said wiper blades through each wiping cycle and wherein said current path is connected between said first and third brushes.
Claim 5
Dependent Claim
39 words
In a windshield wiper system as recited in claim 3 wherein said switch means comprises an electronic valve responsive to the potential between said second and third brushes to open said current path whenever said motor is not rotating.
Claim 6
Dependent Claim
35 words
In an intermittent windshield wiper system as recited in claim 4 wherein said electronic valve comprises a transistor having its emitter connected to said first brush and having its base connected to said second brush.
Claim 7
Dependent Claim
90 words
In an intermittent windshield wiper system having an electric motor for driving windshield wipers through a repeating wiping cycle and circuit means for energizing said motor to drive said wipers intermittently stopping said wipers for dwell periods at the ends of successive wiping cycles, the improvement wherein said circuit means includes braking means to brake said motor to a stop at the ends of such successive wiping cycles and wherein said circuit means includes means to disable said braking means from braking said motor whenever said motor is not rotating.
Claim 8
Dependent Claim
90 words
In an intermittent windshield wiper system having an electric motor for driving windshield wipers through a repeating wiping cycle and circuit means for energizing said motor to drive said wipers intermittently stopping said wipers for dwell periods at the ends of successive wiping cycles, the improvement wherein said circuit means includes braking means to brake said motor to a stop at the ends of such successive wiping cycles and wherein said circuit means includes means to disable said braking means from braking said motor whenever said motor is not rotating.
Claim 9
Dependent Claim
93 words
In a motor system for driving an output intermittently having an electric motor for driving said output and circuit means for energizing said motor to drive said output in steps stopping for a dwell period at the end of each step, the improvement wherein said circuit means includes braking means to electrodynamically brake said motor to a stop at the end of each step, said braking means including a current path connected across the armature of said motor and switch means to open said current path automatically whenever said motor is not rotating.
Claim 10
Dependent Claim
93 words
In a motor system for driving an output intermittently having an electric motor for driving said output and circuit means for energizing said motor to drive said output in steps stopping for a dwell period at the end of each step, the improvement wherein said circuit means includes braking means to electrodynamically brake said motor to a stop at the end of each step, said braking means including a current path connected across the armature of said motor and switch means to open said current path automatically whenever said motor is not rotating.
Claim 11
Dependent Claim
16 words
In a motor system defined in claim 7 wherein said switch means comprises an electronic valve.
Claim 12
Dependent Claim
56 words
In a motor system as recited in claim 7 wherein said motor has first, second and third brushes and wherein said circuit means energizes said motor between said second and third Brushes to cause said motor to drive said output through each step and wherein said current path is connected between said first and third brushes.
Claim 13
Dependent Claim
38 words
In a motor system as recited in claim 9 wherein said switch means comprises an electronic valve responsive to the potential between said second and third brushes to open said current path whenever said motor is not rotating.
Claim 14
Dependent Claim
33 words
In a motor system as recited in claim 10 wherein said electronic valve comprises a transistor having its emitter connected to said first brush and having its base connected to said second brush.
Claim 15
Dependent Claim
87 words
In a motor system for driving an output intermittently having an electric motor for driving said output and circuit means for energizing said motor to drive said output in steps, stopping said output for a dwell period at the end of each step, the improvement wherein said circuit means includes braking means to brake said motor to a stop at the end of each step, and said circuit means further including means to disable said braking means from braking said motor whenever said motor is not rotating.
Claim 16
Dependent Claim
87 words
In a motor system for driving an output intermittently having an electric motor for driving said output and circuit means for energizing said motor to drive said output in steps, stopping said output for a dwell period at the end of each step, the improvement wherein said circuit means includes braking means to brake said motor to a stop at the end of each step, and said circuit means further including means to disable said braking means from braking said motor whenever said motor is not rotating.
Claim 17
Dependent Claim
135 words
A motor system for providing an intermittent drive, comprising a motor having a pair of armature terminals, means for connecting one of said terminals to ground, means for connecting the other one of said terminals to a source of voltage relative to ground to energize said motor, motor responsive control circuit means for intermittently disconnecting said other terminal from said voltage source for regular dwell periods initiated in response to a predetermined rotational position of said motor, separate means for connecting said other terminal to ground to brake said motor in response to said predetermined position of said motor, and separate motion responsive means for disconnecting said other terminal from ground as soon as said motor stops so that said other terminal does not remain connected to ground at the end of a dwell period.
Claim 18
Dependent Claim
135 words
A motor system for providing an intermittent drive, comprising a motor having a pair of armature terminals, means for connecting one of said terminals to ground, means for connecting the other one of said terminals to a source of voltage relative to ground to energize said motor, motor responsive control circuit means for intermittently disconnecting said other terminal from said voltage source for regular dwell periods initiated in response to a predetermined rotational position of said motor, separate means for connecting said other terminal to ground to brake said motor in response to said predetermined position of said motor, and separate motion responsive means for disconnecting said other terminal from ground as soon as said motor stops so that said other terminal does not remain connected to ground at the end of a dwell period.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |