US3703320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Braking system control and anti-lock devices
Assignee: Automobiles Peugeot SA
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Filing: 1970-10-02
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Granted: 1972-11-21
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Expires: 1990-10-02
Abstract
Abstract This anti-lock device for the wheels of motor vehicles comprises a detector adapted to transmit a signal proportional to the slip of a wheel, a member for modulating said signal which is interposed between a source of vacuum and an expansion unit of the braking circuit. Said detector is adapted to compare two signals of which the magnitudes are proportional to the momentary speed of the wheel and to the real speed of the vehicle in relation to the ground, respectively, so as to energize said modulating member.
Inventors
- 👤 Jacques C Remaud
- 👤 Pierre Bouthors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:16
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/58; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; B60T8/34; B60T8/36; B60T8/3615; B60T8/362; B60T8/3625; B60T8/42; B60T8/4208; B60T8/4225; B60T8/4241; B60T8/425; B60T8/4258
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
179 words
An anti-lock device for brakes associated with the wheels of vehicles, comprising: a source of vacuum; a braking circuit expansion unit; means for detecting the momentary rotational speed of a wheel; means for detecting the momentary speed of the vehicle in relation to tHe surface upon which the wheels move; a detector for transmitting a signal whose magnitude is proportional to the relative slip of a wheel in relation to said surface; said magnitude being above a predetermined value; wherein said detector comprises means for comparing two signals whose magnitudes are proportional to the momentary rotational speed of a wheel and to the actual speed of the vehicle in relation to said surface, respectively; and an electromagnetically controlled means for modulating the transmitted signal, said means comprising two connected chambers joined by a variable-volume valve and having a pair of orifices opening into said chambers for connecting said chambers to said expansion unit and said vacuum source, said modulating means interposed between said vacuum source and said locking expansion unit, and said detector connected for energizing said modulating means.
Claim 2
Dependent Claim
179 words
An anti-lock device for brakes associated with the wheels of vehicles, comprising: a source of vacuum; a braking circuit expansion unit; means for detecting the momentary rotational speed of a wheel; means for detecting the momentary speed of the vehicle in relation to tHe surface upon which the wheels move; a detector for transmitting a signal whose magnitude is proportional to the relative slip of a wheel in relation to said surface; said magnitude being above a predetermined value; wherein said detector comprises means for comparing two signals whose magnitudes are proportional to the momentary rotational speed of a wheel and to the actual speed of the vehicle in relation to said surface, respectively; and an electromagnetically controlled means for modulating the transmitted signal, said means comprising two connected chambers joined by a variable-volume valve and having a pair of orifices opening into said chambers for connecting said chambers to said expansion unit and said vacuum source, said modulating means interposed between said vacuum source and said locking expansion unit, and said detector connected for energizing said modulating means.
Claim 3
Dependent Claim
179 words
An anti-lock device for brakes associated with the wheels of vehicles, comprising: a source of vacuum; a braking circuit expansion unit; means for detecting the momentary rotational speed of a wheel; means for detecting the momentary speed of the vehicle in relation to tHe surface upon which the wheels move; a detector for transmitting a signal whose magnitude is proportional to the relative slip of a wheel in relation to said surface; said magnitude being above a predetermined value; wherein said detector comprises means for comparing two signals whose magnitudes are proportional to the momentary rotational speed of a wheel and to the actual speed of the vehicle in relation to said surface, respectively; and an electromagnetically controlled means for modulating the transmitted signal, said means comprising two connected chambers joined by a variable-volume valve and having a pair of orifices opening into said chambers for connecting said chambers to said expansion unit and said vacuum source, said modulating means interposed between said vacuum source and said locking expansion unit, and said detector connected for energizing said modulating means.
Claim 4
Dependent Claim
179 words
An anti-lock device for brakes associated with the wheels of vehicles, comprising: a source of vacuum; a braking circuit expansion unit; means for detecting the momentary rotational speed of a wheel; means for detecting the momentary speed of the vehicle in relation to tHe surface upon which the wheels move; a detector for transmitting a signal whose magnitude is proportional to the relative slip of a wheel in relation to said surface; said magnitude being above a predetermined value; wherein said detector comprises means for comparing two signals whose magnitudes are proportional to the momentary rotational speed of a wheel and to the actual speed of the vehicle in relation to said surface, respectively; and an electromagnetically controlled means for modulating the transmitted signal, said means comprising two connected chambers joined by a variable-volume valve and having a pair of orifices opening into said chambers for connecting said chambers to said expansion unit and said vacuum source, said modulating means interposed between said vacuum source and said locking expansion unit, and said detector connected for energizing said modulating means.
Claim 5
Dependent Claim
49 words
Device according to claim 1, characterized in that said chambers are bounded by diaphragms and that the active surface area of one of said diaphragms is identical with the active surface area of the seat of said valve and lower than the active surface area of the other diaphragm.
Claim 6
Dependent Claim
42 words
Device according to claim 2, characterized in that said valve comprises an axially movable stem having an extension beyond the volume bounded by said diaphragms and responsive to the unidirectional and permanent action of a spring and to an electromagnetically operable member.
Claim 7
Dependent Claim
44 words
Device according to claim 3, characterized in that said modulating means comprises a solenoid the core of which is movable in a magnetic field, and connected for receiving a signal from said detector so as to generate an electromagnetic force proportional to the slip.
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |