US3740104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid brake system with skid control
Assignee: Individual
•
Filing: 1971-08-02
•
Granted: 1973-06-19
•
Expires: 1991-08-02
Abstract
Abstract A fluid brake system for automotive vehicles includes a skid control for releasing the brakes on any wheel when skidding of that wheel commences. The skid control comprises a fluid pressure-responsive normally open sensing valve in the fluid pressure line to each wheel brake cylinder, and constant displacement vacuum pumps driven respectively by the wheels with brakes and a wheel brakeless sensor, the pumps on the brakemounting wheels being connected to the respetive sensing valves to urge the same toward open position, and the sensor wheel pump being connected to the sensing valves to close the same whenever the wheel whose brake is controlled by the respective valve commences to skid and suction produced by the respective valve commences to skid and substantially exceeds that produced by the wheel pump on the skidding wheel whereby to release the brake on the skidding wheel.
Inventors
- 👤 L Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:57
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/40; B60T8/4095; Y; Y10; Y10S; Y10S188/00; Y10S188/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
191 words
In a fluid brake system for vehicles, ground-engaging wheels including a wheel equipped with a brake and a free-running wheel, said brake having fluid pressure-actuating means, a source of fluid under pressure, pressure conduit means connecting said source with said actuating means, a normally closed control valve in said conduit means for admitting fluid to and exhausting fluid pressure from said pressure-actuating means, a normally open sensing valve in said conduit means, wheel speed-responsive sensing valve control means connecting said sensing valve respectively to said free-running wheel and said brake-equipped wheel and arranged to close said sensing valve when said freerunning wheel speed exceeds that of said brake-equipped wheel and thereby interrupt the flow of fluid to the associated brakeactuating means, a second source of fluid under pressure, pressure-responsive override means connected to said brake for overpoweringly opposing said brake-actuating means and releasing said brake responsive to fluid pressure in said override means, override conduit means connecting said second fluid source and said override means and including a normally closed valve openable responsive to closure of said sensing valve for proviDing communication between said second fluid source and said override means.
Claim 2
Dependent Claim
191 words
In a fluid brake system for vehicles, ground-engaging wheels including a wheel equipped with a brake and a free-running wheel, said brake having fluid pressure-actuating means, a source of fluid under pressure, pressure conduit means connecting said source with said actuating means, a normally closed control valve in said conduit means for admitting fluid to and exhausting fluid pressure from said pressure-actuating means, a normally open sensing valve in said conduit means, wheel speed-responsive sensing valve control means connecting said sensing valve respectively to said free-running wheel and said brake-equipped wheel and arranged to close said sensing valve when said freerunning wheel speed exceeds that of said brake-equipped wheel and thereby interrupt the flow of fluid to the associated brakeactuating means, a second source of fluid under pressure, pressure-responsive override means connected to said brake for overpoweringly opposing said brake-actuating means and releasing said brake responsive to fluid pressure in said override means, override conduit means connecting said second fluid source and said override means and including a normally closed valve openable responsive to closure of said sensing valve for proviDing communication between said second fluid source and said override means.
Claim 3
Dependent Claim
38 words
In a fluid brake system according to claim 1, a normally open exhuast valve communicating with said last-named conduit means posterior to said normally closed valve, said exhaust being closable responsive to opening of said normally closed valve.
Claim 4
Dependent Claim
58 words
In a fluid brake system according to claim 2, said brake including a brake application arm, said brake-actuating means comprising a cylinder having a push rod connected to said application arm, said override means comprising a cylinder having a push rod connected to said application arm to move the latter in the opposite direction from its brake-application direction.
Claim 5
Dependent Claim
27 words
In a fluid brake system according to claim 3, said override cylinder being more powerful than the respective brake-actuating cylinder whereby when energized to overpower the latter.
Claim 6
Dependent Claim
33 words
In a fluid brake system according to claim 3, said override cylinder push rod being connected to said application arm radially outwardly of the connection thereto of said brake actuation cylinder push rod.
Claim 7
Dependent Claim
97 words
In a fluid brake system according to claim 6, said sensing valve comprising a cylindrical chamber intersecting said pressure conduit means and a spool axially slidable in said chamber, said spool having an annular groove normally aligned with said pressure conduit means, a spring biasing said spool toward its normal position, one end of said chamber being connected to said first pump and the other end of said chamber being connected to said sensor pump whereby pressure differential between said pumps opposes said spring and moves said spool to disalign said groove from said pressure conduit means.
Claim 8
Dependent Claim
79 words
In a fluid brake system according to claim 7, said override conduit means transversely intersecting said sensing valve chamber at points spaced axially thereof from said brake-actuating pressure conduit means, said valve spool having a second annular groove normally disaligned from said override conduit means when said first groove is aligned with said brake-actuating conduit means, said second annular groove being aligned with said override conduit means when said first annular groove is disaligned from said brake-actuating conduit means.
Claim 9
Dependent Claim
34 words
In a fluid brake system according to claim 8, each of said override conduit means having normally open vent closeable responsive to registry of said second annular groove with said override pressure conduit means.
Claim 10
Dependent Claim
68 words
In a fluid brake system according to claim 9, said vent including a passage transversely intersecting said sensing valve chamber at points spaced axially thereof from said brake-actuating and override conduit means, said spool having a third annular groove normally in registry with said vent passage, and disaligned therefrom when said first and second annular grooves are disaligned and aligned with said brake-actuating and override conduit means respectively.
Claim 11
Dependent Claim
43 words
In a fluid brake system according to claim 6, said constant displacement pumps being vacuum pumps whereby said sensing valves close the respective brake-actuating pressure conduit when the vacuum produced by said first vacuum pump falls below that produced by the sensor pump.
Claim 12
Dependent Claim
94 words
In a fluid brake system according to claim 7, said constant displacement pumps being vacuum pumps, the end of said chamber toward which said spring braces said spool being connected by said first conduit to said first vacuum pump, and the other end of said chamber being connected by said second conduit to said sensor vacuum pump, whereby, when said vacuum produced by said first vacuum pump falls below that produced by said sensor pump, the latter vacuum overcomes said spring and moves said spool to disalign said groove from said brake-actuating conduit means.
References Cited (Backward Citations)
US2423057A
Cited
US2869687A
Cited
US2937051A
Cited
US3004801A
Cited
US3264040A
Cited
US3264039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |