Patent US3576524A successfully refreshed from Google Patents.
US3576524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Systems for transmitting information to moving trains
Assignee: British Railways Board
•
Filing: 1967-06-26
•
Granted: 1971-04-27
•
Expires: 1987-06-26
Abstract
Abstract A system for transmitting local information to a moving train in binary code comprising a number of conductor loops arranged one after the other along the track at the local information point and energized from an alternating current source and a loop aerial on the train which becomes inductively coupled with each of the conductor loops in turn as the train passes the local information point to provide one bit of information from each conductor loop.
Inventors
- 👤 Harry Heggie Ogilvy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:25
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/16; B61L3/22; B61L3/225
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
229 words
A system for transmitting binary coded data from a wayside data transmitting location to a moving vehicle comprising, a plurality of spaced, discrete conductor loops at each said location one for each bit of said coded data and positioned sequentially in the direction of vehicle movement along the wayside, an alternating-current source for energizing each said conductor loop, producing a magnetic field in the vicinity of each loop which is either of a first relative phase or a second opposite relative phase dependent upon the direction of current flow in said loop, and detector means on said vehicle including first means adapted to be inductively coupled with each said conductor loop in sequence as said vehicle passes said data transmitting location, said detector means further including second means responsive to the inductive coupling of said first means with a conductor loop which provides a magnetic field of said first phase to provide a first phase manifestation representative of a one bit and being responsive to the inductive coupling of said first means with a conductor loop providing a magnetic field of said second opposite phase to provide a second phase manifestation representative of a zero bit, and decoder means responsive to the sequential reception of said first and second phase manifestations to provide a composite signal representative of the binary coded data transmitted from the wayside to said vehicle.
Claim 2
Independent Claim
229 words
A system for transmitting binary coded data from a wayside data transmitting location to a moving vehicle comprising, a plurality of spaced, discrete conductor loops at each said location one for each bit of said coded data and positioned sequentially in the direction of vehicle movement along the wayside, an alternating-current source for energizing each said conductor loop, producing a magnetic field in the vicinity of each loop which is either of a first relative phase or a second opposite relative phase dependent upon the direction of current flow in said loop, and detector means on said vehicle including first means adapted to be inductively coupled with each said conductor loop in sequence as said vehicle passes said data transmitting location, said detector means further including second means responsive to the inductive coupling of said first means with a conductor loop which provides a magnetic field of said first phase to provide a first phase manifestation representative of a one bit and being responsive to the inductive coupling of said first means with a conductor loop providing a magnetic field of said second opposite phase to provide a second phase manifestation representative of a zero bit, and decoder means responsive to the sequential reception of said first and second phase manifestations to provide a composite signal representative of the binary coded data transmitted from the wayside to said vehicle.
Claim 3
Dependent Claim
63 words
A system according to claim 1 wherein said alternating-current source comprises a transmitter on said vehicle, the output of said transmitter being fed to a transmitting aerial on the vehicle, and circuit means including said conductor loops which is inductively coupled to said aerial to cause an induced current to flow in said conductor loops as said vehicle passes said data transmitting location.
Claim 4
Dependent Claim
74 words
A system according to claim 2, wherein said detector means includes a receiving loop which is inductively coupled with each conductor loop in turn as said vehicle passes said data transmitting location and further includes means responsive to the relative phase of the signal induced in said receiving loop upon each inductive coupling with a respective inductor loop with the signal provided by said alternating-current source to provide thereby said first and second manifestations.
Claim 5
Dependent Claim
62 words
A system according to claim 2, wherein said vehicle is a train riding on a track and said conductor loops are disposed to one side of the centerline of the track, said detecting means including a receiving loop which is arranged to pass directly above said conductor loops and said transmitting aerial being arranged to pass along the centerline of the track.
Claim 6
Dependent Claim
56 words
A system as claimed in claim 4, wherein said circuit means comprises a closed circuit including a pair of conductors extending one on either side of the centerline of the track and connected to each other at their ends, said conductor loops being connected in series with each other through one of said pair of conductors.
Claim 7
Dependent Claim
33 words
A system as claimed in claim 1, wherein said conductor loops are invertible to reverse the direction of winding of the conductor loops to permit thereby selective alteration of the transmitted binary code.
Claim 8
Dependent Claim
130 words
A system as claimed in claim 2, wherein said circuit means comprises a pair of conductors extending on either side of the centerline of the track over a first portion of the track and joined to each other at one end and connected at their other end to said conductor loops which extend over a second portion of the track and are disposed symmetrically about the centerline of the track, the length of said first portion of the track exceeding the length of the second portion of the track and the transmitting aerial and the detecting means on the train being arranged to move along the centerline of the track and being spaced from each other longitudinally by a distance exceeding the length of the second portion of the track.
Claim 9
Dependent Claim
18 words
A system as claimed in claim 1, wherein said conductor loops are energized from a stationary alternating-current source.
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |