US3977634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Computer for motion sensing device setup
Assignee: Siemens Industry Inc
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Filing: 1975-06-09
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Granted: 1976-08-31
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Expires: 1995-06-09
Abstract
Abstract A system for calibrating a receiver in a railroad grade crossing protection system having a transmitter and receiver connected to the rails and a defined approach track section, utilizes the receiver detected motion voltage to determine low ballast resistance. A signal representative of the ballast condition is then utilized in conjunction with the signal representative of train motion to calibrate the receiver for the particular ballast condition.
Inventors
- 👤 Richard E. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:24
CPC Classifications
B; B61; B61L; B61L29/00; B61L29/24; B61L29/28; B61L29/286
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
68 words
A method of calibrating a receiver in a railroad grade crossing protection system having a transmitter and receiver connected to the rails and a defined approach track section including the steps of: a. providing an electrical signal indicative of ballast condition, b. comparing said ballast signal with E D , c. varying receiver gain until the variation between E D and said ballast signal is within predetermined limits.
Claim 2
Independent Claim
68 words
A method of calibrating a receiver in a railroad grade crossing protection system having a transmitter and receiver connected to the rails and a defined approach track section including the steps of: a. providing an electrical signal indicative of ballast condition, b. comparing said ballast signal with E D , c. varying receiver gain until the variation between E D and said ballast signal is within predetermined limits.
Claim 3
Dependent Claim
26 words
The method of claim 1 further characterized in that said ballast condition signal is determined by measuring the separation between E DX and E DZ .
Claim 4
Dependent Claim
40 words
The method of claim 2 further characterized in that the actual separation of E DX and E DZ is compared with a programmed relationship between such separation and E D to arrive at said electrical signal indicative of ballast condition.
Claim 5
Dependent Claim
95 words
In a receiver for use in a railroad grade crossing protection system having a transmitter and receiver connected to the rails and a defined approach track section, circuit means in said receiver for deriving E D , E DX and E DZ , circuit means for determining the separation of E DX and E DZ and for providing a signal indicative of ballast condition, circuit means for comparing said ballast signal and E D , and means for varying receiver gain until the comparison between E D and the ballast signal is within predetermined limits.
Claim 6
Dependent Claim
95 words
In a receiver for use in a railroad grade crossing protection system having a transmitter and receiver connected to the rails and a defined approach track section, circuit means in said receiver for deriving E D , E DX and E DZ , circuit means for determining the separation of E DX and E DZ and for providing a signal indicative of ballast condition, circuit means for comparing said ballast signal and E D , and means for varying receiver gain until the comparison between E D and the ballast signal is within predetermined limits.
Claim 7
Dependent Claim
60 words
The receiver of claim 4 further characterized in that the circuit means for determining the separation of E DX and E DZ and for providing a signal indicative of ballast condition includes means for summing E DX and E DZ and a plurality of parallel connected zener diodes and resistor series combinations connected to the output of said summing circuit.
Claim 8
Dependent Claim
41 words
The receiver of claim 5 further characterized by and including a source of a reference voltage connected to the output of said parallel combination, and a second summing circuit connected to said reference voltage and the output of said parallel combination.
Claim 9
Dependent Claim
54 words
The receiver of claim 6 further characterized in that said circuit means for comparing includes a pair of comparators, each having inputs of E D and the output of said second summing circuit, and indicating means connected to the output of each comparator, with the indicating means having an overlap in their indicating ranges.
Claim 10
Dependent Claim
16 words
The receiver of claim 7 further characterized in that said indicating means includes light emitting diodes.
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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |