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US3834767A
Expired / Lapsed
US
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Trailer auxiliary hydraulic brake system
Assignee: Individual
•
Filing: 1973-03-26
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Granted: 1974-09-10
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Expires: 1993-03-26
Abstract
Abstract A trailer auxiliary hydraulic brake system completely independent of the conventional brake system and including a wheel-driven hydraulic pump, an accumulator, a main brake control valve, a back-up release valve and a fluid reservoir. An automatic actuation member, responsive to a longitudinally slidable connection between the tractor and trailer, controls the flow of pressurized hydraulic fluid to and from the trailer brakes. The trailer auxiliary system, in addition to automatically energizing the trailer brakes, also includes an assembly for manual actuation of the main brake control valve thus permitting emergency braking, pulsating braking and use of the system as a parking brake.
Inventors
- 👤 D Bullinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:05
CPC Classifications
B; B60; B60T; B60T7/00; B60T7/12; B60T7/20; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/141; B60T13/148
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
208 words
In the combination of a truck tractor having a fifth wheel mount and a tractor trailer having a king pin secured to said mount, said trailer also including wheels having a conventional air or vacuum brake system and controls therefor, the addition of an independent auxiliary hydraulic braking system for said trailer wheel brakes, said hydraulic system being wholly local to said trailer and including: a. means for generating hydraulic fluid under pressure when said trailer is travelling in a forward direction; b. accumulator means for storing said pressurized fluid; c. first valve means for controlling the flow of said pressurized hydraulic fluid to and from said trailer brakes; d. a longitudinally slidable connection between said tractor and trailer; and e. means for automatically actuating said first valve means, responsive to said slidable connection when said connection is shortened due to over-riding of said trailer with reference to said tractor, to permit the flow of pressurized hydraulic fluid to said trailer brakes thereby hydraulically energizing said trailer brakes, wherein said independent hydraulic braking system for said trailer wheels further includes: 1. second valve means for disabling said first valve means; and 2. means for actuating said second valve means upon movemenT of said trailer in a rearward direction.
Claim 2
Dependent Claim
208 words
In the combination of a truck tractor having a fifth wheel mount and a tractor trailer having a king pin secured to said mount, said trailer also including wheels having a conventional air or vacuum brake system and controls therefor, the addition of an independent auxiliary hydraulic braking system for said trailer wheel brakes, said hydraulic system being wholly local to said trailer and including: a. means for generating hydraulic fluid under pressure when said trailer is travelling in a forward direction; b. accumulator means for storing said pressurized fluid; c. first valve means for controlling the flow of said pressurized hydraulic fluid to and from said trailer brakes; d. a longitudinally slidable connection between said tractor and trailer; and e. means for automatically actuating said first valve means, responsive to said slidable connection when said connection is shortened due to over-riding of said trailer with reference to said tractor, to permit the flow of pressurized hydraulic fluid to said trailer brakes thereby hydraulically energizing said trailer brakes, wherein said independent hydraulic braking system for said trailer wheels further includes: 1. second valve means for disabling said first valve means; and 2. means for actuating said second valve means upon movemenT of said trailer in a rearward direction.
Claim 3
Dependent Claim
16 words
means for actuating said second valve means upon movemenT of said trailer in a rearward direction.
Claim 4
Dependent Claim
16 words
means for actuating said second valve means upon movemenT of said trailer in a rearward direction.
Claim 5
Dependent Claim
44 words
In the combination of claim 1 wherein said independent hydraulic braking system for said trailer wheels further includes means for manual remote actuation of said first valve means, for hydraulically energizing said trailer brakes for emergency braking and for use as a parking brake.
Claim 6
Dependent Claim
40 words
The combination of claim 2 wherein said independent braking system for said trailer wheels further includes lock-out means for said automatic actuation means (for said first valve means) so as to permit only manual actuation of said first valve means.
Claim 7
Dependent Claim
44 words
In the combination of claim 1 wherein said independent hydraulic braking system for said trailer wheels further includes a hydraulic fluid reservoir that is hydraulically connected with said means for generating hydraulic fluid under pressure, as well as said first and second valve means.
Claim 8
Dependent Claim
43 words
In the combination of claim 4 wherein said second valve means in one position, is hydraulically interconnected between said accumulator means and said first valve means and in another position is hydraulically interconnected between said trailer wheel brakes and said hydraulic fluid reservoir.
Claim 9
Dependent Claim
48 words
In the combination of claim 4 wherein said first valve means, in one position, is hydraulically interconnected between said accumulator means, via said second valve means, and said trailer wheel brakes and in another position is hydraulically interconnected between said trailer wheel brakes and said hydraulic fluid reservoir.
References Cited (Backward Citations)
US2051522A
Cited
US2152017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |