US3566103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rail vehicle control systems
Assignee: SPX Technologies Inc
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Filing: 1968-12-06
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Granted: 1971-02-23
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Expires: 1988-12-06
Abstract
Abstract A system for controlling the operation of rail vehicles in response to a continuously variable frequency in the rails, wherein the frequency varies in accordance with the distance of the vehicle relative to a wayside location at which the frequency is applied to the rails. This distance frequency signal is used in combination with a frequency signal generated in accordance with the actual speed of the vehicle to control operation of the vehicle.
Inventors
- 👤 Clinton S Wilcox
- 👤 Vincent P Kovalcik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:18
CPC Classifications
B; B60; B60L; B60L15/00; B60L15/20; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/72
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
A rail vehicle speed control system wherein the improvement comprises: a. means including a variable frequency oscillator for transmitting through the rails from a wayside location to a vehicle a signal variable in frequency automatically in response to changes in distance from the vehicle to the wayside location; b. means on the vehicle for receiving the variable frequency distant signal from the rails; c. means on the vehicle for generating a signal variable in frequency according to the speed of the vehicle; and d. control means governed jointly by the distance frequency signal and the speed frequency signal for controlling the speed of the vehicle substantially continuously as it proceeds relative to the wayside location.
Claim 2
Dependent Claim
115 words
A rail vehicle speed control system wherein the improvement comprises: a. means including a variable frequency oscillator for transmitting through the rails from a wayside location to a vehicle a signal variable in frequency automatically in response to changes in distance from the vehicle to the wayside location; b. means on the vehicle for receiving the variable frequency distant signal from the rails; c. means on the vehicle for generating a signal variable in frequency according to the speed of the vehicle; and d. control means governed jointly by the distance frequency signal and the speed frequency signal for controlling the speed of the vehicle substantially continuously as it proceeds relative to the wayside location.
Claim 3
Dependent Claim
27 words
The invention according to claim 1 wherein the control means comprises computing means for generating a stopping pattern to stop the vehicle substantially at the wayside location.
Claim 4
Dependent Claim
38 words
The invention according to claim 2 wherein the computing means comprises means for comparing a product of signals characteristic of the respective frequencies of the distant and speed frequency signals with a constant to obtain an error signal.
Claim 5
Dependent Claim
25 words
The invention according to claim 3 wherein the error signal is used in the control means to control the speed of operation of the vehicle.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |