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US4865278A
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Control command system for railway vehicles
Assignee: Nabco Ltd
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Filing: 1988-03-18
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Granted: 1989-09-12
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Expires: 2008-03-18
Abstract
Abstract A brake and/or propulsion command arrangement for railway vehicles, especially for abnormality detection of a dual brake system having a cam controller for producing ON-OFF control signals. The abnormal detection system employs a comparing circuit for comparing the control signals, an interlocking circuit for producing a verification signal of the position of the cam controlling, and evaluating circuit for producing a trouble detection signal when the control signals are unmatched and during the presence of the verification signal.
Inventors
- 👤 Masaaki Kitaue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:06
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/228
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A control command system for railway vehicles comprising, a comparator for detecting that a pair of multiplex command signals are matched a handle for manually switching the command signals, an interlock for producing a verification signal at certain handle positions except when the command signals are being switched manually, and an evaluator which produces a trouble detection signal when both an unmatched detect signal from the comparator and the verification signal from the interlock appear in the control command system.
Claim 2
Dependent Claim
80 words
A control command system for railway vehicles comprising, a comparator for detecting that a pair of multiplex command signals are matched a handle for manually switching the command signals, an interlock for producing a verification signal at certain handle positions except when the command signals are being switched manually, and an evaluator which produces a trouble detection signal when both an unmatched detect signal from the comparator and the verification signal from the interlock appear in the control command system.
Claim 3
Dependent Claim
23 words
The control command system as defined in claim 1, wherein a drum controller including cam plates and switches establish said certain handle positions.
Claim 4
Dependent Claim
19 words
The control command system as defined in claim 1, wherein said interlock includes a cam and a cam switch.
Claim 5
Dependent Claim
18 words
The control command system as defined in claim 1, wherein said comparator includes a plurality of EXCLUSIVE-OR circuits.
Claim 6
Dependent Claim
18 words
The control command system as defined in claim 1, wherein said evaluator includes a plurality of AND gates.
Claim 7
Dependent Claim
20 words
The control command system as defined in claim 1, wherein said multiplex command signals are conveyed over a duplex system.
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) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |