US3680314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic emergency brake system
Assignee: Individual
•
Filing: 1969-11-19
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Granted: 1972-08-01
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Expires: 1989-11-19
Abstract
Abstract An automotive vehicle, hydraulic emergency brake system comprising two parallel systems, one operated by the foot pedal brake and the other, by the emergency brake. To each wheel cylinder is connected a Tee valve having one arm connected to each system and which Tee valve is pressure-responsive so as to automatically close off whichever system has developed a leak, whereby the other system can still operate all four wheel brakes.
Inventors
- 👤 Francis J Toomey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:15
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/268; B60T11/00; B60T11/10; B60T11/16; B60T11/18; B60T11/24; B60T11/28; B60T11/32; B60T11/323; B60T11/34; B60T13/36; B60T13/40; B60T13/403; B60T17/00; B60T17/18; B60T7/00; B60T7/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
302 words
An automatic, safety, hydraulic fluid pressure system for operating the four braking wheel cylinders of four vehicle wheel brakes simultaneously, comprising, in combination, a two-way valve associated with each braking wheel cylinder for introducing hydraulic braking fluid selectively through either of two inlets of each valve to each of said braking wheel cylinders, two dual master cylinders, two separate and independent conduit means, each interconnecting one of said dual master cylinders to all four of said braking wheel cylinders through one of said valve inlets of each valve, each of said two-way valves being automatically responsive to the pressure differential applied to its inlets as developed by both said dual master cylinders so as to automatically connect only one of said dual master cylinders to said four wheel cylinders through one of said conduit means at any one time and completely disconnect the other of said master cylinders and of said conduit means from the braking system as the result of loss of pressure from a leak in one of said conduit means so as to seal off said leak from the braking system, each of said valves having a connection in the form of a tee, one leg being connected to a wheel cylinder, a second leg connected to a system operated by one of said dual master cylinders and a foot brake pedal, and a third leg connected to an emergency brake system connected to the other of said dual master cylinders and operated by an emergency brake, and a linkage between said foot brake pedal and emergency brake for sequentially operating the emergency brake by foot pressure after an abnormally great movement of the foot pedal in response to a leakage in the foot brake system, whereby the emergency brake will apply hydraulic pressure to all four wheel cylinders.
Claim 2
Dependent Claim
302 words
An automatic, safety, hydraulic fluid pressure system for operating the four braking wheel cylinders of four vehicle wheel brakes simultaneously, comprising, in combination, a two-way valve associated with each braking wheel cylinder for introducing hydraulic braking fluid selectively through either of two inlets of each valve to each of said braking wheel cylinders, two dual master cylinders, two separate and independent conduit means, each interconnecting one of said dual master cylinders to all four of said braking wheel cylinders through one of said valve inlets of each valve, each of said two-way valves being automatically responsive to the pressure differential applied to its inlets as developed by both said dual master cylinders so as to automatically connect only one of said dual master cylinders to said four wheel cylinders through one of said conduit means at any one time and completely disconnect the other of said master cylinders and of said conduit means from the braking system as the result of loss of pressure from a leak in one of said conduit means so as to seal off said leak from the braking system, each of said valves having a connection in the form of a tee, one leg being connected to a wheel cylinder, a second leg connected to a system operated by one of said dual master cylinders and a foot brake pedal, and a third leg connected to an emergency brake system connected to the other of said dual master cylinders and operated by an emergency brake, and a linkage between said foot brake pedal and emergency brake for sequentially operating the emergency brake by foot pressure after an abnormally great movement of the foot pedal in response to a leakage in the foot brake system, whereby the emergency brake will apply hydraulic pressure to all four wheel cylinders.
Claim 3
Dependent Claim
104 words
A hydraulic emergency brake system as recited in claim 11 wherein each of said valves includes a slidable, pressure responsive cylindrical element having tapered end portions cooperable with seats formed in the ends of threaded couplings screw threaded to said cylindrical element, a sealing ring rigidly mounted in each of the two legs of said tee connected to the respective dual master cylinders for frictionally holding said cylindrical element in selective positions and whereby when a leak develops in one system, it will be automatically shut-off in response to movement of said cylindrical element in response to a higher pressure from the other system.
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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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |