US3832016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two pipe truck trailer brake system with means for applying front and rear trailer brakes upon pull-in-two
Assignee: Westinghouse Bremsen und Apparatebau GmbH
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Filing: 1973-07-12
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Granted: 1974-08-27
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Expires: 1993-07-12
Abstract
Abstract This invention relates to a two-pipe dual brake apparatus for the trailer of a tractor-trailer vehicle in which a trailer control valve device has two coaxial and oppositely disposed pistons forming a chamber therebetween to which fluid under pressure may be supplied through one of the two pipes. These pistons operate a pair of supply and release valve mechanisms one of which controls the brakes on the rear wheels of the trailer and the other the brakes on the front wheels. A pair of storage reservoirs are provided on the trailer and charged from a compressor on the tractor. Fluid under pressure from one reservoir is supplied by one valve mechanism to operate the brakes for the front trailer wheels. Likewise, fluid under pressure from the other reservoir is supplied by the other valve mechanism to operate the brakes for the rear trailer wheels. The control valve device further comprises a third piston operable, upon the subsequent release, via a check valve, of fluid under pressure supplied thereto from the tractor, to effect operation of both valve mechanisms to thereby effect a brake application on both the front and rear wheels of the trailer.
Inventors
- 👤 E Pekrul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:06
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/18; B60T15/20; B60T11/00; B60T11/10; B60T11/28; B60T11/32; B60T11/326; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
269 words
For use in a two-pipe dual brake apparatus for a trailer of a tractor-trailer vehicle having separate brake applying means for the front and rear wheels of the trailer, a trailer control valve device operable responsively to variations of pressure of a fluid in either one of the two pipes to effect the supply of fluid under pressure to both of the brake applying means to cause a brake application on the front and rear wheels of the trailer, said trailer control valve device comprising: a. a pair of valve means for controlling respectively the supply of fluid under pressure to and the release of fluid under pressure from said separate brake applying means to effect a brake application and a brake release on the front and rear wheels of the trailer, b. a pair of oppositely arranged abutments cooperating to form a chamber therebetween to which chamber fluid under pressure may be supplied and released via one of the two pipes whereby shifting of said pair of abutments in opposite directions effects the operation of both of said valve means, c. biasing means, and d. a third abUtment subjectable on one side to fluid under pressure in the other one of said two pipes and on the other side to said biasing means and so operatively associated with said pair of valve means as to cause operation of both of said valve means in response to the release of fluid under pressure from said one side of said third abutment whereby a brake application is simultaneously effected on both the front and the rear wheels of the trailer.
Claim 2
Dependent Claim
269 words
For use in a two-pipe dual brake apparatus for a trailer of a tractor-trailer vehicle having separate brake applying means for the front and rear wheels of the trailer, a trailer control valve device operable responsively to variations of pressure of a fluid in either one of the two pipes to effect the supply of fluid under pressure to both of the brake applying means to cause a brake application on the front and rear wheels of the trailer, said trailer control valve device comprising: a. a pair of valve means for controlling respectively the supply of fluid under pressure to and the release of fluid under pressure from said separate brake applying means to effect a brake application and a brake release on the front and rear wheels of the trailer, b. a pair of oppositely arranged abutments cooperating to form a chamber therebetween to which chamber fluid under pressure may be supplied and released via one of the two pipes whereby shifting of said pair of abutments in opposite directions effects the operation of both of said valve means, c. biasing means, and d. a third abUtment subjectable on one side to fluid under pressure in the other one of said two pipes and on the other side to said biasing means and so operatively associated with said pair of valve means as to cause operation of both of said valve means in response to the release of fluid under pressure from said one side of said third abutment whereby a brake application is simultaneously effected on both the front and the rear wheels of the trailer.
Claim 3
Dependent Claim
60 words
For use in a two-pipe dual brake apparatus for a tractor-trailer vehicle, a trailer control valve device, as recited in claim 1, further characterized by one-way flow valve means for providing for flow of fluid under pressure from said one side of said third abutment to said other side and preventing flow from said other side to said one side.
Claim 4
Dependent Claim
163 words
For use in a two-pipe dual brake apparatus for a tractor-trailer vehicle, a trailer control valve device, as recited in claim 1, further characterized in that one of said pair of valve means is carried by said third abutment in such a position relative to one of said pair of abutments that movement of said third abutment and said one valve means carried thereby in the direction of said one abutment in response to said release of fluid under pressure from said one side of said third abutment causes said one abutment to operate said one valve means, and a member having a resilient connection with said third abutment is effective to simultaneously operate the other of said pair of valve means independently of the other of said pair of abutments whereby a brake application is effected simultaneously on the front and the rear wheels of the trailer upon said release of fluid under pressure from said one side of said third abutment.
Claim 5
Dependent Claim
187 words
For use in a two-pipe dual brake apparatus for a tractor-trailer vehicle, a trailer control valve device, as recited in claim 3, further characterized in that said resilient connection comprises: a. an annular member interposed between said biasing means and said third abutment, b. a rod extending through said annular member and having a shoulder adjacent one end thereof, the opposite end being so disposed as to effect operation of said other valve means, and c. resilient means interposed between said annular member and said one end of said rod, said resilient means being normally effective to bias said shoulder on said rod against said annular member whereby said release of fluid under pressure from said one side of said third abutment renders said biasing means effective to cause shifting of said third abutment relative to said pair of abutments whereby said rod effects the operation of said other valve means simultaneously as said one of said pair of valve means carried by said third abutment is operated by said one abutment to cause concurrent supply of fluid under pressure to both of said brake applying means.
Claim 6
Dependent Claim
137 words
For use in a two-pipe dual brake apparatus for a tractor-trailer vehicle, a trailer control valve device, as recited in claim 4, further characterized in that said rod slidably extends through said pair of oppositely arranged abutments, and said opposite end of said rod carries a stop member to limit movement in one direction of said other abutment relative to said rod whereby said other abutment is effective to shift said rod and said stop member in said one direction in response to the supply of fluid under pressure to said chamber to render said other abutment effective to operate said other valve means via said stop member simultaneously as said one abutment effects operation of said one valve means thereby to cause a brake application simultaneously on both the front and rear wheels of the trailer.
Claim 7
Dependent Claim
148 words
For use in a two-pipe dual brake apparatus for a tractor-trailer vehicle, a trailer control valve device, as recited in claim 4, further characterized in that said rod slidably extends through said pair of oppositely arranged abutments, and said opposite end of said rod carries a stop member to limit movement in one directIon of said other abutment relative to said rod whereby said third abutment is effective to shift said rod and said stop member in said one direction relative to said pair of abutments in response to said release of fluid under pressure from said one side of said third abutment to render said stop member effective to operate said other valve means simultaneously as said one valve means carried by said third abutment is operated by said one abutment to cause a brake application simultaneously on both the front and rear wheels of the trailer.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |