Patent US4854648A successfully refreshed from Google Patents.
US4854648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic air braking system
Assignee: Nabco Ltd
•
Filing: 1988-06-23
•
Granted: 1989-08-08
•
Expires: 2008-06-23
Abstract
Abstract An automatic air braking system for a railway train having a flow detector for sensing the flow of pressurized air in the brake line during a brake release command time. A pilot chamber located in a relay valve which is pressurized when a signal from the flow detector exceeds a first predetermined pressure value and which stops the pressurization when the flow signal drops below a second predetermined pressure value. The brake line runs from the lead unit or locomotive of the train and through the railway vehicle or freight cars connected to and pulled by the lead unit or locomotive. The relay valve which is an automatic-lapping-type is located in the lead unit or locomotive in which the pilot chamber is exhausted in response to the reception of a brake release command. An output chamber, which is located in the relay valve, is connected to the brake line of the lead unit or locomotive. The output chamber is pressurized in response to pressurization of the pilot chamber and is exhausted in response to exhaustion of the pilot chamber, so as to accelerate the brake release operation along the length of the train.
Inventors
- 👤 Yasuo Nakao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:44
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/36; B60T15/42
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
216 words
An automatic air braking system for a railway train comprising, a flow detector being connected to the brake line for sensing the flow of pressurized air in a brake line during a brake release command time, a pilot chamber being located in a relay valve being pressurized when a flow signal from said flow detector exceeds a first predetermined pressure value and which stops the pressurization when the flow signal drops below a second predetermined pressure value, said brake line running from the lead unit or locomotive of the train and through the railway vehicle or freight cars connected to and pulled by said lead unit or locomotive, said relay valve being an automatic-lapping-type valve and being located in said lead unit or locomotive in which said pilot chamber being exhausted in response to the reception of a brake command and which is pressurized in response to the reception of a brake release command, an output chamber being located in said relay valve and being connected to said brake line of said lead unit or locomotive, and said output chamber being pressurized in response to the pressurization of said pilot chamber and being exhausted in response to the exhaustion of the pilot chamber so as to accelerate the brake operation along the length of the train.
Claim 2
Dependent Claim
216 words
An automatic air braking system for a railway train comprising, a flow detector being connected to the brake line for sensing the flow of pressurized air in a brake line during a brake release command time, a pilot chamber being located in a relay valve being pressurized when a flow signal from said flow detector exceeds a first predetermined pressure value and which stops the pressurization when the flow signal drops below a second predetermined pressure value, said brake line running from the lead unit or locomotive of the train and through the railway vehicle or freight cars connected to and pulled by said lead unit or locomotive, said relay valve being an automatic-lapping-type valve and being located in said lead unit or locomotive in which said pilot chamber being exhausted in response to the reception of a brake command and which is pressurized in response to the reception of a brake release command, an output chamber being located in said relay valve and being connected to said brake line of said lead unit or locomotive, and said output chamber being pressurized in response to the pressurization of said pilot chamber and being exhausted in response to the exhaustion of the pilot chamber so as to accelerate the brake operation along the length of the train.
Claim 3
Dependent Claim
23 words
The automatic air braking system for a railway train, as defined in claim 1, wherein a manually-operated brake valve initiates an analog signal.
Claim 4
Dependent Claim
23 words
The automatic air braking system for a railway train, as defined in claim 1, wherein a manually-operated brake valve initiates a binary signal.
Claim 5
Dependent Claim
26 words
The automatic air braking system for a railway train, as defined in claim 2, wherein an electrical controller receives the analog signal from said brake valve.
Claim 6
Dependent Claim
26 words
The automatic air braking system for a railway train, as defined in claim 3, wherein an electrical controller receives the binary signal from said brake valve.
Claim 7
Dependent Claim
35 words
The automatic air braking system for a railway train, as defined in claim 4, wherein said electrical controller being connected to an electromagnetic valve which is pneumatically-connected to said pilot chamber of said relay valve.
Claim 8
Dependent Claim
30 words
The automatic air braking system for a railway train, as defined in claim 6, wherein a pressure regulating valve being pneumatically-connected from a main reservoir line to said electromagnetic valve.
Claim 9
Dependent Claim
140 words
An automatic air brake system for accelerting the exhaustion of pressure in the brake line of a train comprising, a flow rate detector being located in the brake line of the locomotive to detect the flow of air in the brake line, a pilot chamber of a relay valve being supplemented when a flow signal from the flow rate detector exceeds a predetermined value, and the supplementation of the pilot chamber being stopped when the flow signals drops below a predetermined value, the pilot chamber being exhausted in response to a brake application command and being pressurized in response to a brake release command, the relay valve includes an output chamber being connected to the brake line of the locomotive, the brake line pressurizes and exhausts the output chamber in response to the pressurization and exhaustion of the pilot chamber.
Claim 10
Dependent Claim
140 words
An automatic air brake system for accelerting the exhaustion of pressure in the brake line of a train comprising, a flow rate detector being located in the brake line of the locomotive to detect the flow of air in the brake line, a pilot chamber of a relay valve being supplemented when a flow signal from the flow rate detector exceeds a predetermined value, and the supplementation of the pilot chamber being stopped when the flow signals drops below a predetermined value, the pilot chamber being exhausted in response to a brake application command and being pressurized in response to a brake release command, the relay valve includes an output chamber being connected to the brake line of the locomotive, the brake line pressurizes and exhausts the output chamber in response to the pressurization and exhaustion of the pilot chamber.
Claim 11
Dependent Claim
99 words
An automatic brake control system for a railway train comprising, a brake line extending the length of the train, a brake valve for initiating a brake application command and a brake release command, a relay valve having output and pilot chambers, a flow rate detector being connected between the brake line and the output chamber, a controller receiving a status signal from the brake valve and a flow signal from the flow rate detector, an electromagnetic valve controlled by the controller to pressurize the pilot chamber to accelerate the exhaustion of the brake line during a brake application command.
Claim 12
Dependent Claim
99 words
An automatic brake control system for a railway train comprising, a brake line extending the length of the train, a brake valve for initiating a brake application command and a brake release command, a relay valve having output and pilot chambers, a flow rate detector being connected between the brake line and the output chamber, a controller receiving a status signal from the brake valve and a flow signal from the flow rate detector, an electromagnetic valve controlled by the controller to pressurize the pilot chamber to accelerate the exhaustion of the brake line during a brake application command.
Claim 13
Dependent Claim
23 words
The automatic brake control system, as defined in claim 9, wherein the relay valve includes a supply, an exhaust, and a lap position.
Claim 14
Dependent Claim
21 words
The automatic brake control system, as defined in claim 9, wherein the electromagnetic valve includes a supply and an exhaust position.
Claim 15
Dependent Claim
27 words
The automatic brake control system, as defined in claim 9, wherein a pressure regulator valve being connected between a main reservoir pressure line and the electromagnetic valve.
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) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |