US3765729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive vehicle emergency air brake system
Assignee: Individual
•
Filing: 1972-05-15
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Granted: 1973-10-16
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Expires: 1992-05-15
Abstract
Abstract One form of the invention is 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 pressureresponsive so as to automatically close off whichever system has developed a leak, whereby the other system can still operate all four wheel brakes. Another form of the invention is a similar system for an air brake system for buses, tractors and trailers, wherein a hand operated valve is used as the emergency valve for emergency braking.
Inventors
- 👤 F Toomey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:09
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
363 words
An automatic, fluid pressure emergency braking system for automotive vehicles of the tractor-trailer type, comprising four brake operating chambers closely associated with two front and two rear wheel brakes, respectively, of the tractor, a two-way differential valve connected to each of said brake operating chambers, each valve having two separate inlets for selective introduction of fluid under pressure into the associated brake operating chamber in response to the differential pressure of said two inlets, a pair of front brake conduits, each interconnecting an inlet of one differential valve to an inlet of the other differential valve of the front wheel brake operating chambers, a pair of rear brake conduits, each interconnecting an inlet of one differential valve with an inlet of the other differential valve of the rear brake operating chambers, a source of fluid under pressure controlled by a brake pedal and connected to one of each of said front and rear pairs of conduits, a source of fluid under pressure controlled by an emergency brake connected to the other of said front and rear brake pairs of conduits, whereby upon leakage in either of said pairs of conduits, the associated differential valves will close off the leaking conduits from the brake operating system and automatically connect the other of said pairs of conduits to provide sufficient braking fluid under pressure to said four brake operating chambers so as to operate all four brakes of the tractor, and a third pair of brake operating chambers mounted on the trailer and closely associated with a pair of trailer brakes, a two-way differential valve connected to each of said third pair of brake operating chambers, each of which has two separate valve inlets for selective introduction of fluid under pressure into the associated trailer brake operating chamber in response to the differential pressure of said two inlets, a pair of trailer brake conduits, each interconnecting an inlet of one differential valve to an inlet of the other differential valve of the trailer brake operating chambers, said trailer brake operating chambers being normally pressurized by a separate pressure source and controlled by said hand brake in response to operation of said trailer brake differential valves.
Claim 2
Dependent Claim
363 words
An automatic, fluid pressure emergency braking system for automotive vehicles of the tractor-trailer type, comprising four brake operating chambers closely associated with two front and two rear wheel brakes, respectively, of the tractor, a two-way differential valve connected to each of said brake operating chambers, each valve having two separate inlets for selective introduction of fluid under pressure into the associated brake operating chamber in response to the differential pressure of said two inlets, a pair of front brake conduits, each interconnecting an inlet of one differential valve to an inlet of the other differential valve of the front wheel brake operating chambers, a pair of rear brake conduits, each interconnecting an inlet of one differential valve with an inlet of the other differential valve of the rear brake operating chambers, a source of fluid under pressure controlled by a brake pedal and connected to one of each of said front and rear pairs of conduits, a source of fluid under pressure controlled by an emergency brake connected to the other of said front and rear brake pairs of conduits, whereby upon leakage in either of said pairs of conduits, the associated differential valves will close off the leaking conduits from the brake operating system and automatically connect the other of said pairs of conduits to provide sufficient braking fluid under pressure to said four brake operating chambers so as to operate all four brakes of the tractor, and a third pair of brake operating chambers mounted on the trailer and closely associated with a pair of trailer brakes, a two-way differential valve connected to each of said third pair of brake operating chambers, each of which has two separate valve inlets for selective introduction of fluid under pressure into the associated trailer brake operating chamber in response to the differential pressure of said two inlets, a pair of trailer brake conduits, each interconnecting an inlet of one differential valve to an inlet of the other differential valve of the trailer brake operating chambers, said trailer brake operating chambers being normally pressurized by a separate pressure source and controlled by said hand brake in response to operation of said trailer brake differential valves.
Claim 3
Dependent Claim
36 words
A braking system as recited in claim 1 wherein said fluid is air and wherein said emergency brake is a hand operated valve and wherein said brake pedal includes an air valve operated by pedal pressure.
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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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |