US3751117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antiskid apparatus
Assignee: Cegelec SA
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Filing: 1970-11-18
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Granted: 1973-08-07
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Expires: 1990-11-18
Abstract
Abstract Antiskid apparatus wherein the velocity of two axles is electrically measured and a signal representing the velocity difference is fed to a differentiator device which operates a switching circuit when the change in velocity difference exceeds a predetermined value. The switching circuit then operates an antiskid device to reduce the velocity difference. A time delay is coupled to the switching circuit to maintain the switching circuit operated for a predetermined period of time after the switching circuit input is turned off (that is, after the change in velocity difference falls below a predetermined value.
Inventors
- 👤 J Soffer
- 👤 F Tonnerieux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:52
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/321; B60T8/3235; B60T8/3245
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
Antiskid apparatus comprising: means (1, 2, 3) for measuring the velocity difference between two rotating axles (9, 10) and providing a speed difference signal; a differentiator device (4) connected to the output from the velocity difference measuring means (1-3) differentiating the speed difference signal and generating a derivative output signal; switching means (5, 6) coupled to the output of said differentiator device (4) and operated when said derivative output signal exceeds a predetermined value; an antiskid device (8) responsive to the output of said switching means and being operable to reduce the rate of change of the velocity difference between said two axles; and delay means (7) coupled to said switching means (5,6) and holding said antiskid device in operated condition to extend the operating time of the antiskid device beyond the time when the input signal to the switching means has ceased maintaining said antiskid device (8) effective for a predetermined period of time after the input signal to said switching means is removed.
Claim 2
Dependent Claim
165 words
Antiskid apparatus comprising: means (1, 2, 3) for measuring the velocity difference between two rotating axles (9, 10) and providing a speed difference signal; a differentiator device (4) connected to the output from the velocity difference measuring means (1-3) differentiating the speed difference signal and generating a derivative output signal; switching means (5, 6) coupled to the output of said differentiator device (4) and operated when said derivative output signal exceeds a predetermined value; an antiskid device (8) responsive to the output of said switching means and being operable to reduce the rate of change of the velocity difference between said two axles; and delay means (7) coupled to said switching means (5,6) and holding said antiskid device in operated condition to extend the operating time of the antiskid device beyond the time when the input signal to the switching means has ceased maintaining said antiskid device (8) effective for a predetermined period of time after the input signal to said switching means is removed.
Claim 3
Dependent Claim
38 words
Apparatus according to claim 1 wherein said switching means includes a multivibrator (5) coupled to the output of said differentiator device, and a switching device (6) coupling the output of said multivibrator (5) to said antiskid device (8).
Claim 4
Dependent Claim
13 words
Apparatus according to claim 2 wherein said switching device (6) is a relay.
Claim 5
Dependent Claim
44 words
Apparatus according to claim 2 wherein said delay means (7) is coupled between said multivibrator (5) and said switching device (6) for maintaining saiD switching device (6) operated for a predetermined period of time after the input signal to said multivibrator is turned off.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |