US4049324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-pneumatic emergency brake control system for a vehicle train
Assignee: Individual
•
Filing: 1975-11-17
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Granted: 1977-09-20
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Expires: 1995-11-17
Abstract
Abstract There is provided a brake system for a vehicle train which includes a tractor and a trailer, a source of high pressure air connected through an air control line to a pneumatic brake with the air control line in the tractor being connected to a fast-acting pressure switch which is activated by a higher pressure and a slow-acting pressure switch which is activated by a lower pressure, and with the fast-acting pressure switch operatively connected to open a valve to supply high pressure air directly to the trailer brake, and with said low pressure switch operatively connected to open the circuit which includes the fast-acting pressure switch.
Inventors
- 👤 Eduard Cermak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:52
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/66; B60T13/68; B60T13/683; Y; Y10; Y10S; Y10S303/00; Y10S303/02; Y10S303/03
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
158 words
A brake system for a vehicle train including a tractor and a trailer which comprises: a. a source of high pressure connected through a control line to operate a pneumatic brake system in a tractor vehicle and in a trailer vehicle, b. an electric circuit which, when closed, electrically opens a valve to supply high pressure air directly to the brake system in said trailer vehicle, c. a fast-acting pressure switch on said tractor vehicle and in said electric circuit, said fast-acting switch acting responsive to a particular pressure in said control line to close said electric circuit, d. a slow-acting pressure switch on said tractor vehicle and in said electric circuit, said slow-acting pressure switch acting responsive to a pressure in said control line that is lower than said particular pressure to open said electric circuit, and e. means actuated when both said fast-acting switch and said slow-acting switch are closed to by pass said slow-acting switch.
Claim 2
Dependent Claim
158 words
A brake system for a vehicle train including a tractor and a trailer which comprises: a. a source of high pressure connected through a control line to operate a pneumatic brake system in a tractor vehicle and in a trailer vehicle, b. an electric circuit which, when closed, electrically opens a valve to supply high pressure air directly to the brake system in said trailer vehicle, c. a fast-acting pressure switch on said tractor vehicle and in said electric circuit, said fast-acting switch acting responsive to a particular pressure in said control line to close said electric circuit, d. a slow-acting pressure switch on said tractor vehicle and in said electric circuit, said slow-acting pressure switch acting responsive to a pressure in said control line that is lower than said particular pressure to open said electric circuit, and e. means actuated when both said fast-acting switch and said slow-acting switch are closed to by pass said slow-acting switch.
Claim 3
Dependent Claim
28 words
The brake system of claim 1 wherein said fast-acting switch is connected to said control line closely adjacent the source of high pressure air to said control line.
Claim 4
Dependent Claim
24 words
The brake system of claim 1 wherein slow-acting switch is connected to said control line downstream of the connection of said fast acting switch.
Claim 5
Dependent Claim
34 words
The brake system of claim 1 wherein said slow-acting switch is connected to said control line through a orifice plate which restricts the flow of air from said control line to said slow-acting switch.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |