Patent US5006847A successfully refreshed from Google Patents.
US5006847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Train motion detection apparatus
Assignee: Mercedes Benz Group AG
•
Filing: 1988-04-05
•
Granted: 1991-04-09
•
Expires: 2008-04-05
Abstract
Abstract An apparatus and method is provided for determining when a train operating in a transit system is not moving along a provided travel path in accordance with the sensed actual occupancy time of a track signal block by that train in relation to a desired occupancy time in that track signal block by that train.
Inventors
- 👤 Donald L. Rush
- 👤 Norman W. May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:17
CPC Classifications
B; B61; B61L; B61L27/00; B61L27/10; B61L27/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
152 words
A monitoring system for detecting when any of one or more trains operating in a transit system is not moving along the system track as desired, the system track being divided into successive track signal blocks each having means for generating a signal indicating whether a train is occupying any portion of the signal block, said monitoring system comprising: computer means for storing the respective occupancy signals for the track blocks; said computer means periodically comparing new and past occupancy signal values for the track blocks to indicate occupancy changes; means for resetting an alarm timer for each block occupancy change; means for enabling each running timer to continue operation if no occupancy change has occurred in the block to which the timer corresponds; and means for generating a system operator alarm when any running timer reaches a present time limit to indicate a no-motion train condition requiring system level supervisory action.
Claim 2
Dependent Claim
152 words
A monitoring system for detecting when any of one or more trains operating in a transit system is not moving along the system track as desired, the system track being divided into successive track signal blocks each having means for generating a signal indicating whether a train is occupying any portion of the signal block, said monitoring system comprising: computer means for storing the respective occupancy signals for the track blocks; said computer means periodically comparing new and past occupancy signal values for the track blocks to indicate occupancy changes; means for resetting an alarm timer for each block occupancy change; means for enabling each running timer to continue operation if no occupancy change has occurred in the block to which the timer corresponds; and means for generating a system operator alarm when any running timer reaches a present time limit to indicate a no-motion train condition requiring system level supervisory action.
Claim 3
Dependent Claim
52 words
A monitoring system as set forth in claim 1 wherein means are provided for detecting whether any of one or more predetermined train operator overrides apply to a detected no-motion train condition and for negating the generation of a system alarm for any no-motion train condition for which such an override exists.
Claim 4
Dependent Claim
17 words
A monitoring system as set forth in claim 2 wherein the operator overrides include an operator hold.
References Cited (Backward Citations)
US2009950A
Cited
US2712595A
Cited
US3248521A
Cited
US3109616A
Cited
US3176125A
Cited
US3402289A
Cited
US3575594A
Cited
US3601602A
Cited
US3771463A
Cited
US3805056A
Cited
US3771119A
Cited
JPS5217797A
Cited
JPS5266175A
Cited
US4220946A
Cited
US4179739A
Cited
US4361301A
Cited
US4361300A
Cited
US4495578A
Cited
US4562543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-08 | 1994-10-08 | 1995-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-08 | 1998-10-08 | 1999-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-08 | 2002-10-08 | 2003-04-09 | $7700.00 | Window Closed / Lapsed |