US3592315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tractor-trailer brake system
Assignee: Individual
•
Filing: 1969-11-20
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Granted: 1971-07-13
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Expires: 1989-11-20
Abstract
Abstract The brake system includes conventional air brake actuators for the tractor and trailer, controlled from a source of pressurized air in the tractor by a brake pedal actuated control valve. Reduced pressure air is directed to the trailer actuators only through an automatic system controlled by a valve coupled to the engine foot throttle linkage. This valve is normally closed, but is opened when the foot throttle is released to partially apply the trailer brakes. The system may also includes a manual control valve for applying the trailer brakes only.
Inventors
- 👤 Henry B Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:11
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/103; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/40; B60T13/403
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
149 words
In a tractor-trailer brake system including a source of pressurized air; brake actuators for the tractor wheel brakes; brake actuators for the trailer wheel brakes; first conduit means communicating said source with said tractor and trailer actuators; a foot actuated control valve for controlling the flow of air through said first conduit means to said tractor and said trailer actuators to actuate the brakes; and a foot actuated throttle control for the tractor engine; second conduit means communicating said source with said trailer brake actuators; a second control valve for controlling the flow of air through the second conduit means; means coupling said second control valve to said throttle control to effect the closing of said control valve when said throttle control is actuated to open the engine throttle, and to effect the opening of said control valve when the throttle control is released to the engine idle position.
Claim 2
Dependent Claim
149 words
In a tractor-trailer brake system including a source of pressurized air; brake actuators for the tractor wheel brakes; brake actuators for the trailer wheel brakes; first conduit means communicating said source with said tractor and trailer actuators; a foot actuated control valve for controlling the flow of air through said first conduit means to said tractor and said trailer actuators to actuate the brakes; and a foot actuated throttle control for the tractor engine; second conduit means communicating said source with said trailer brake actuators; a second control valve for controlling the flow of air through the second conduit means; means coupling said second control valve to said throttle control to effect the closing of said control valve when said throttle control is actuated to open the engine throttle, and to effect the opening of said control valve when the throttle control is released to the engine idle position.
Claim 3
Dependent Claim
33 words
A system as set forth in claim 1 including check valve means in said first conduit means for preventing the flow of air from said second control valve to said tractor brake actuators.
Claim 4
Dependent Claim
29 words
A system as set forth in claim 1 including regulating means in said second conduit means for controlling the pressure of air flowing therethrough to said trailer brake actuators.
Claim 5
Dependent Claim
36 words
A system as set forth in claim 1 including third conduit means communicating said source with said trailer brake actuators; a manually operable control valve for controlling the flow of air through said third conduit means.
Claim 6
Dependent Claim
29 words
A system as set forth in claim 3 wherein said second control valve is an on-off valve open only in the engine idle position of the foot throttle control.
Claim 7
Dependent Claim
113 words
In a tractor-trailer brake system including brake actuators for the tractor wheel brakes, brake actuators for the trailer wheel brakes, a source of pressurized air associated with the tractor, and conduit means communicating said source with said tractor wheel brake actuators and with said trailer wheel brake actuators; a control system comprising a control valve and associated conduit means for directing pressurized air from said source to said trailer brake actuators only; said control valve being responsive to the throttle control for the tractor engine, whereby said control valve is opened in the idle condition of said throttle control and whereby said control valve is closed in other conditions of said throttle control.
Claim 8
Dependent Claim
113 words
In a tractor-trailer brake system including brake actuators for the tractor wheel brakes, brake actuators for the trailer wheel brakes, a source of pressurized air associated with the tractor, and conduit means communicating said source with said tractor wheel brake actuators and with said trailer wheel brake actuators; a control system comprising a control valve and associated conduit means for directing pressurized air from said source to said trailer brake actuators only; said control valve being responsive to the throttle control for the tractor engine, whereby said control valve is opened in the idle condition of said throttle control and whereby said control valve is closed in other conditions of said throttle control.
Claim 9
Dependent Claim
37 words
A tractor-trailer brake system as set forth n claim 6 including adjustable pressure regulator means in said control system conduit means for setting the pressure of air supplied to said trailer brake actuators through said control valve.
Claim 10
Dependent Claim
61 words
A tractor-trailer brake system as set forth in claim 6 including a second control system comprising a second control valve and associated conduit means for directing pressurized air to said tractor actuators and said trailer actuators; and check valve means in said second system for preventing the flow of air from said first named control valve to said tractor brake actuators.
Claim 11
Dependent Claim
64 words
A tractor-trailer brake system as set forth in claim 7 wherein said first named and second control systems include common conduit means for directing air to said trailer brake actuators; and double-acting check valve means connected to said common conduit means providing alternative flow of air to said trailer brake actuators from one or the other of said first named and second control valves.
Claim 12
Dependent Claim
34 words
A tractor-trailer brake system as yet forth in claim 8 a third control system comprising a third manually operable control valve and associated conduit means for directing air to said trailer brake actuators only.
Claim 13
Dependent Claim
75 words
A tractor-trailer brake system as set forth in claim 10 wherein said first named second and third control systems each communicate with said trailer brake actuators through a common conduit means; and check valve means associated with the conduit means for effecting the flow of air from only one of said control valves to said trailer brake actuators, and for preventing reverse flow from an one control valve to the other of said control valves.
Claim 14
Dependent Claim
36 words
A tractor-trailer brake system as set forth in claim 10 including check valve means associated with said second control system for preventing actuation of said tractor brake actuators by said first named or third control valves.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |