Patent US4496193A successfully refreshed from Google Patents.
US4496193A
Expired / Lapsed
US
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Vigilance safety control system
Assignee: Westinghouse Air Brake Co
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Filing: 1982-09-20
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Granted: 1985-01-29
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Expires: 2002-09-20
Abstract
Abstract A vigilance safety control arrangement for periodically checking the attentiveness of a trainman. The arrangement includes a pair of capacitive charging circuits connectable to a source of voltage and a pair of resistive-capacitive discharging circuits connectable to an application and indication relay. An electrical toggle switch for periodically connecting one of the pair of capacitive charging circuits to the voltage source and one of the pair of capacitive discharging circuits to the application and indication relay for causing a magnet valve to maintain the brakes of the train in their released position.
Inventors
- 👤 Steven C. Rumsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:19
CPC Classifications
B; B60; B60T; B60T7/00; B60T7/12; B60T7/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A vigilance safety control system for periodically checking the alertness of a train operator comprising, a pair of charging circuits connectable to a source of voltage, a pair of discharging circuits connectable to a first relay, a reversing switch for selectively and periodically connecting one of said pair of charging circuits to the voltage source and one of said pair of discharging circuits to said first relay for causing a magnet valve to maintain the brakes of the train in their released position, and said reversing switch connects one of said pair of discharging circuits to a second relay which controls a warning device to alert the train operator to shift said reversing switch.
Claim 2
Dependent Claim
114 words
A vigilance safety control system for periodically checking the alertness of a train operator comprising, a pair of charging circuits connectable to a source of voltage, a pair of discharging circuits connectable to a first relay, a reversing switch for selectively and periodically connecting one of said pair of charging circuits to the voltage source and one of said pair of discharging circuits to said first relay for causing a magnet valve to maintain the brakes of the train in their released position, and said reversing switch connects one of said pair of discharging circuits to a second relay which controls a warning device to alert the train operator to shift said reversing switch.
Claim 3
Dependent Claim
20 words
The vigilance safety control system as defined in claim 1, wherein each of said charging circuits includes a capacitive element.
Claim 4
Dependent Claim
30 words
The vigilance safety control system as defined in claim 1, wherein said first relay includes a front contact which completes a circuit from the voltage source to said magnet valve.
Claim 5
Dependent Claim
47 words
The vigilance safety control system as defined in claim 1, wherein said reversing switch includes a single-pole double-throw switch having a front contact connected to one of said pair of charging circuits and having a back contact connected to the other of said pair of charging circuits.
Claim 6
Dependent Claim
45 words
The vigilance safety control system as defined in claim 1, wherein said reversing switch includes a double-pole double-throw switch having a front contact connected to one of said discharging circuits and having a back contact connected to the other of said pair of discharging circuits.
Claim 7
Dependent Claim
19 words
The vigilance safety control switch as defined in claim 1, wherein said magnet valve is connected to a whistle.
Claim 8
Dependent Claim
21 words
The vigilance safety control system as defined in claim 6, wherein said magnet valve is connected to a brake application valve.
Claim 9
Dependent Claim
23 words
The vigilance safety control system as defined in claim 6, wherein each of said discharging circuits includes a series connected resistor and diode.
Claim 10
Dependent Claim
17 words
The vigilance safety control system as defined in claim 1, wherein said warning device is a lamp.
References Cited (Backward Citations)
US3246140A
Cited
US3778116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |