Patent US3993365A successfully refreshed from Google Patents.
US3993365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antiskid control system
Assignee: Aisin Corp
•
Filing: 1975-10-21
•
Granted: 1976-11-23
•
Expires: 1995-10-21
Abstract
Abstract An antiskid control system includes a hydraulic pressure control device connected between a braking hydraulic pressure source and wheel cylinders. The hydraulic pressure control device has a variable volume chamber adapted to cyclically vary the hydraulic brake pressure applied to the wheel cylinders from the braking hydraulic source and a valve adapted to control both the hydraulic pressure communication between the variable volume chamber and the wheel cylinders, and the hydraulic pressure communication between the braking hydraulic pressure source and the wheel cylinders. The variable volume chamber and the valve are also independently actuated in response to the sensed braking conditions of the wheel.
Inventors
- 👤 Toshiyuki Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:59
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4225; B60T8/4233; B60T13/00; B60T13/10; B60T13/12; B60T13/16; B60T13/161; B60T8/50; B60T8/5018; B60T8/5025; B60T8/5037; B60T8/5043
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
239 words
An antiskid control system comprising: a. a braking hydraulic pressure source; b. a power source; c. wheel cylinders; d. first passage means for connecting said braking hydraulic pressure source to said wheel cylinders; e. computer means for detecting a locking condition of the wheels and for producing an indicating signal upon said detection; f. control means actuated in response to said indicating signal from said computer means; and g. a hydraulic pressure control device provided in said first passage means and including: i. a housing, ii. means provided in said housing for varying the hydraulic pressure supplied to said wheel cylinders, iii. second passage means for connecting said means for varying the hydraulic pressure supplied to the wheel cylinders to said first passage means, iv. a single valve for selectively controlling both said first and second passage means, v. first servo means communicable with said power source by said control means for actuating said means for varying the hydraulic pressure supplied to the wheel cylinders, vi. second servo means communicable with said power source by said control means for actuating said single valve, and wherein said valve includes two opposed valve seats formed at ends of said first and second passage means and a valve member normally positioned for closing said second passage means by said second servo means and positioned by said second servo means for closing said first passage means during a locking condition of the wheels.
Claim 2
Dependent Claim
239 words
An antiskid control system comprising: a. a braking hydraulic pressure source; b. a power source; c. wheel cylinders; d. first passage means for connecting said braking hydraulic pressure source to said wheel cylinders; e. computer means for detecting a locking condition of the wheels and for producing an indicating signal upon said detection; f. control means actuated in response to said indicating signal from said computer means; and g. a hydraulic pressure control device provided in said first passage means and including: i. a housing, ii. means provided in said housing for varying the hydraulic pressure supplied to said wheel cylinders, iii. second passage means for connecting said means for varying the hydraulic pressure supplied to the wheel cylinders to said first passage means, iv. a single valve for selectively controlling both said first and second passage means, v. first servo means communicable with said power source by said control means for actuating said means for varying the hydraulic pressure supplied to the wheel cylinders, vi. second servo means communicable with said power source by said control means for actuating said single valve, and wherein said valve includes two opposed valve seats formed at ends of said first and second passage means and a valve member normally positioned for closing said second passage means by said second servo means and positioned by said second servo means for closing said first passage means during a locking condition of the wheels.
Claim 3
Dependent Claim
137 words
An antiskid control system as set forth in claim 1, wherein said first servo means comprises a first control chamber which selectively receives the hydraulic pressure from said power source under the control of said control means and a first slidable piston means urged by the hydraulic pressure within said first control chamber in a direction in which said means for varying the hydraulic pressure supplied to the wheel cylinder reduces the hydraulic pressure supplied to the wheel cylinders, and said second servo means comprises a second control chamber which selectively receives the fluid pressure from said power source under the control of said control means and a second slidable piston means urged by the hydraulic pressure within said second control chamber in a direction in which said first passage means is closed by said valve member.
Claim 4
Dependent Claim
59 words
An antiskid control system as set forth in claim 2, wherein said first servo means further comprises first means for urging said first piston means against the hydraulic pressure within said first control chamber, and wherein said second servo means further comprises second means for urging said second piston means against the hydraulic pressure within said second control chamber.
Claim 5
Dependent Claim
37 words
An antiskid control system as set forth in claim 3, wherein said first urging means comprises a chamber for receiving, from said power source, hydraulic pressure which is applied to one side of said first piston means.
Claim 6
Dependent Claim
31 words
An antiskid control system as set forth in claim 4, further comprising throttle valve means for controlling a drain of the hydraulic pressure within said chamber of said first urging means.
Claim 7
Dependent Claim
18 words
An antiskid control system as set forth in claim 3, wherein said first urging means comprises a spring.
Claim 8
Dependent Claim
49 words
An antiskid control system as set forth in claim 3, wherein said second urging means comprises a spring. 8. An antiskid control system as set forth in claim 1, wherein said second servo means further includes means for biasing said valve member toward closure of said first passage means.
Claim 9
Dependent Claim
30 words
An antiskid control system as set forth in claim 1, wherein said second servo means further includes means for biasing said valve member toward closure of said first passage means.
Claim 10
Dependent Claim
36 words
An antiskid control system as set forth in claim 8, further comprising means for alarming during the releasing operation of a locking condition of the wheels in response to the relative position of said biasing means.
Claim 11
Dependent Claim
34 words
An antiskid control system as set forth in claim 1, wherein said control means comprises means for varying the transmitting speed of the hydraulic pressure to and from said first and second servo means.
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) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |