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US3639754A
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System for computing a stopping pattern signal for a vehicle
Assignee: SPX Technologies Inc
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Filing: 1969-12-24
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Granted: 1972-02-01
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Expires: 1989-12-24
Abstract
Abstract A system is provided for computing a stopping pattern signal for a vehicle initiated upon the vehicle passing a wayside marker in approach of a stopping point. A digital storage is provided for storing a number corresponding to the square root of the distance from the marker to the stopping point. A delta counter is provided for periodically updating the digital storage as the vehicle progresses from the wayside marker toward the stopping point, and a digital-to-analog converter is provided for converting the digital storage into an analog signal which is combined with a constant to generate a pattern signal.
Inventors
- 👤 Vincent P Kovalcik
- 👤 Robert F Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:09
CPC Classifications
B; B61; B61L; B61L15/00; B61L15/0062; B60; B60T; B60T7/00; B60T7/12; B60T7/128; B61L15/0094; B60L; B60L2200/00; B60L2200/26; B60T2230/00; B60T2230/04; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/72
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
A system for computing a stopping pattern signal for a vehicle initiated by passage of the vehicle past a wayside marker in approach of a stopping point having means for computing a stopping pattern signal wherein the improvement comprises: a. means for storing digitally a number corresponding to the square root of the distance from the marker to the stopping point upon passage of the vehicle past the marker, b. means including a counter responsive to progress of the vehicle for periodically updating the storage means wherein the updating means periodically subtracts whole number increments from the stored digital number corresponding to the square root of the distance travelled by the vehicle as it progresses in approach of the stopping point, and c. means for converting the number in the digital storage means to an analog value for combining with a constant to generate the pattern signal.
Claim 2
Independent Claim
147 words
A system for computing a stopping pattern signal for a vehicle initiated by passage of the vehicle past a wayside marker in approach of a stopping point having means for computing a stopping pattern signal wherein the improvement comprises: a. means for storing digitally a number corresponding to the square root of the distance from the marker to the stopping point upon passage of the vehicle past the marker, b. means including a counter responsive to progress of the vehicle for periodically updating the storage means wherein the updating means periodically subtracts whole number increments from the stored digital number corresponding to the square root of the distance travelled by the vehicle as it progresses in approach of the stopping point, and c. means for converting the number in the digital storage means to an analog value for combining with a constant to generate the pattern signal.
Claim 3
Dependent Claim
18 words
The system according to claim 1 wherein the storing means comprises a digital counter adapted to count down.
Claim 4
Dependent Claim
45 words
The system according to claim 1 wherein the updating counter means has as its input, pulses characteristic of incremental distances travelled by the vehicle and has as its output, pulses characteristic of whole numbers that are the square root of distances travelled by the vehicle.
Claim 5
Dependent Claim
58 words
The system according to claim 2 wherein the updating counter means operates through successive cycles, each cycle corresponding to passage of the vehicle an incremental distance corresponding to two times the count in the digital counter minus 1, and wherein a count is subtracted from the digital counter for each cycle of operation of the updating counter means.
Claim 6
Dependent Claim
23 words
The system according to claim 3 wherein the input pulses of the updating counting means are derived from an axle driven frequency generator.
Claim 7
Dependent Claim
28 words
The system according to claim 5 wherein means is provided to alter the frequency of the input pulses in accordance with an adjustment to compensate for wheel wear.
References Cited (Backward Citations)
US3524055A
Cited
US3525044A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |