US4296707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railroad car hand brake signal device
Assignee: American National Bank and Trust Company of Chicago
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Filing: 1980-02-13
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Granted: 1981-10-27
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Expires: 2000-02-13
Abstract
Abstract A railroad car hand brake signal device alerts a train crew when a rail car hand brake is set and air is supplied to the brake pipe during operation of the train. If a rail car hand brake remains applied when air is supplied to the train's brake pipe, a whistle is sounded to enable the crew to identify the car having a set hand brake and a leakage path is provided to cause the air pressure in the brake pipe to fall to alert the train crew in the locomotive that a hand brake is set.
Inventors
- 👤 Leroy P. Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:40
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/228
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
212 words
A railroad car hand brake signal device for alerting a train crew that a hand brake is applied when air is supplied to a train brake pipe during operation of the train, the signal device comprising a housing and means for mounting the housing on a railroad car; characterized by a port formed laterally in a wall in the housing which is connected to the railroad car brake pipe, blocking means for blocking the port movable within the housing between a first position which blocks the port and a second position which opens the port to bleed air in the brake pipe into the housing, an air operated whistle formed in the housing, a passage formed in means connecting the whistle to the housing which connects the port with the whistle, the passage being sized to cause significant bleed off of air in the brake pipe when the port is open to signal the train crew, and means for connecting the blocking means with a movable element of the hand brake wherein when the hand brake is applied the element moves in one direction to thereby move the blocking means to the second position to uncover the port to cause air to bleed from the brake pipe and the whistle to operate.
Claim 2
Dependent Claim
212 words
A railroad car hand brake signal device for alerting a train crew that a hand brake is applied when air is supplied to a train brake pipe during operation of the train, the signal device comprising a housing and means for mounting the housing on a railroad car; characterized by a port formed laterally in a wall in the housing which is connected to the railroad car brake pipe, blocking means for blocking the port movable within the housing between a first position which blocks the port and a second position which opens the port to bleed air in the brake pipe into the housing, an air operated whistle formed in the housing, a passage formed in means connecting the whistle to the housing which connects the port with the whistle, the passage being sized to cause significant bleed off of air in the brake pipe when the port is open to signal the train crew, and means for connecting the blocking means with a movable element of the hand brake wherein when the hand brake is applied the element moves in one direction to thereby move the blocking means to the second position to uncover the port to cause air to bleed from the brake pipe and the whistle to operate.
Claim 3
Dependent Claim
21 words
The hand brake signal device of claim 1, further characterized by means for biasing the blocking means toward the first position.
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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |