Patent US3753260A successfully refreshed from Google Patents.
US3753260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse reflection test means for balanced pressure surveillance detector
Assignee: Westinghouse Electric Corp
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Filing: 1971-10-04
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Granted: 1973-08-14
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Expires: 1991-10-04
Abstract
Abstract In a buried hose pressure responsive detection system for monitoring intrusion of a designated area, a combination of a pressure transducer means and a pulse reflection test means for determining the integrity of the buried hose is positioned at a common location in the hose for monitoring both intrusion of the designated area as well as providing random determination of the integrity of the hose. The pulse relfection test means functions to transmit a pressure pulse from the common location to a remote end of the hose and the pressure transducer means responds to the return of an unaltered pressure pulse reflected from the hose end as an indication of a no-fault hose condition. If however a hose fault condition exists, i.e. a hose break, the travel of the pressure pulse is foreshortened and an air pocket present in the hose at the fault location reflects an inverted version of the pressure pulse back to the pressure transducer means. The pressure transducer means generates a first level dc signal in response to an unaltered pressure pulse indicative of a no-fault hose condition and a second level dc signal in response to an inverted pressure pulse indicative of a fault hose condition.
Inventors
- 👤 A Nelkin
- 👤 F Geil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:40
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
224 words
In a security apparatus, including a fluid-filled pressure responsive hose member, a pressure transducer means operatively associated with said fluid in said hose member for generating a signal indicative of changes in the fluid pressure in said hose, and an intrusion alarm circuit means operatively connected to said pressure transducer means and responsive to said signal, the combination of, a hose integrity checking means operatively associated with said fluid in said hose including means for transmitting a pressure change in said fluid to determine the presence or absence of hose faults, said pressure change being reflected back from the remote end of said hose to said pressure transducer means in the absence of a hose fault, said pressure change being reflected back from a hose location corresponding to a hose fault to said pressure transducer means in the presence of a hose fault, hose fault detection circuit means operatively connected to said pressure transducer means for responding to said reflected pressure change to indicate the presence or absence of a hose fault, and means for delaying the connection of said hose fault detection means to said pressure transducer means for a period of time sufficient to prevent said hose fault detection means from responding to the initial pressure change while assuring the response of said hose fault detection means to the reflected pressure change.
Claim 2
Dependent Claim
224 words
In a security apparatus, including a fluid-filled pressure responsive hose member, a pressure transducer means operatively associated with said fluid in said hose member for generating a signal indicative of changes in the fluid pressure in said hose, and an intrusion alarm circuit means operatively connected to said pressure transducer means and responsive to said signal, the combination of, a hose integrity checking means operatively associated with said fluid in said hose including means for transmitting a pressure change in said fluid to determine the presence or absence of hose faults, said pressure change being reflected back from the remote end of said hose to said pressure transducer means in the absence of a hose fault, said pressure change being reflected back from a hose location corresponding to a hose fault to said pressure transducer means in the presence of a hose fault, hose fault detection circuit means operatively connected to said pressure transducer means for responding to said reflected pressure change to indicate the presence or absence of a hose fault, and means for delaying the connection of said hose fault detection means to said pressure transducer means for a period of time sufficient to prevent said hose fault detection means from responding to the initial pressure change while assuring the response of said hose fault detection means to the reflected pressure change.
Claim 3
Dependent Claim
225 words
In a security apparatus, including a fluid-filled pressure responsive hose member, a pressure transducer means operatively associated with said fluid in said hose member for generating a signal indicative of changes in the fluid pressure in said hose, and an intrusion alarm circuit means operatively connected to said pressure transducer means and responsive to said signal, the combination of, a hose integrity checking means operatively associated with said fluid in said hose including means for transmitting a pressure change in said fluid to determine the presence or absence of hose faults, said pressure change being reflected back from the remote end of said hose to said pressure transducer means in the absence of a hose fault, said pressure Change being reflected back from a hose location corresponding to a hose fault to said pressure transducer means in the presence of a hose fault, wherein said pressure change is a pulse having a duration which exceeds the maximum period of time of travel of the initial pressure change from the hose integrity checking means to the remote end of said hose and the time of travel of the reflected pressure change to said pressure transducer means, and hose fault detection circuit means operatively connected to said pressure transducer means for responding to the reflected pressure change by indicating the presence or absence of a hose fault.
Claim 4
Dependent Claim
225 words
In a security apparatus, including a fluid-filled pressure responsive hose member, a pressure transducer means operatively associated with said fluid in said hose member for generating a signal indicative of changes in the fluid pressure in said hose, and an intrusion alarm circuit means operatively connected to said pressure transducer means and responsive to said signal, the combination of, a hose integrity checking means operatively associated with said fluid in said hose including means for transmitting a pressure change in said fluid to determine the presence or absence of hose faults, said pressure change being reflected back from the remote end of said hose to said pressure transducer means in the absence of a hose fault, said pressure Change being reflected back from a hose location corresponding to a hose fault to said pressure transducer means in the presence of a hose fault, wherein said pressure change is a pulse having a duration which exceeds the maximum period of time of travel of the initial pressure change from the hose integrity checking means to the remote end of said hose and the time of travel of the reflected pressure change to said pressure transducer means, and hose fault detection circuit means operatively connected to said pressure transducer means for responding to the reflected pressure change by indicating the presence or absence of a hose fault.
Claim 5
Dependent Claim
254 words
In a security apparatus, including a fluid-filled pressure responsive hose member, a pressure transducer means operatively associated with said fluid in said hose member for generating a signal indicative of changes in the fluid pressure in said hose, and an intrusion alarm circuit means operatively connected to said pressure transducer means and responsive to said signal, the combination of, a hose integrity checking means operatively associated with said fluid in said hose including means for transmitting a pressure change in said fluid to determine the presence or absence of hose faults, said pressure change being reflected back from the remote end of said hose to said pressure transducer means in the absence of a hose fault, said pressure change being reflected back from a hose location corresponding to a hose fault to said pressure transducer means in the presence of a hose fault, and hose fault detection circuit means operatively connected to said pressure transducer means to produce a first manifestation in response to a reflected pressure change indicative of the absence of a hose fault and a second manifestation in response to a reflected pressure change indicative of the presence of a hose fault, wherein said first manifestation corresponds to a first pressure change travel time representing the time for the pressure change to be transmitted to the remote end of said hose and reflected back to said pressure transducer means, and said second manifestation corresponds to a second pressure change travel time which is less than said first pressure change travel time.
Claim 6
Dependent Claim
254 words
In a security apparatus, including a fluid-filled pressure responsive hose member, a pressure transducer means operatively associated with said fluid in said hose member for generating a signal indicative of changes in the fluid pressure in said hose, and an intrusion alarm circuit means operatively connected to said pressure transducer means and responsive to said signal, the combination of, a hose integrity checking means operatively associated with said fluid in said hose including means for transmitting a pressure change in said fluid to determine the presence or absence of hose faults, said pressure change being reflected back from the remote end of said hose to said pressure transducer means in the absence of a hose fault, said pressure change being reflected back from a hose location corresponding to a hose fault to said pressure transducer means in the presence of a hose fault, and hose fault detection circuit means operatively connected to said pressure transducer means to produce a first manifestation in response to a reflected pressure change indicative of the absence of a hose fault and a second manifestation in response to a reflected pressure change indicative of the presence of a hose fault, wherein said first manifestation corresponds to a first pressure change travel time representing the time for the pressure change to be transmitted to the remote end of said hose and reflected back to said pressure transducer means, and said second manifestation corresponds to a second pressure change travel time which is less than said first pressure change travel time.
Claim 7
Dependent Claim
239 words
In a security apparatus, including a fluid-filled pressure reponsive hose member, a pressure transducer means operatively associated with said fluid in said hose member for generating a signal indicative of changes in the fluid pressure in said hose, and an intrusion alarm circuit means operatively connected to said pressure transducer means and responsive to said signal, the combination of, a hose integrity checking means operatively associated with said fluid in said hose including means for transmitting a pressure change in said fluid to determine the presence or absence of hose faults, said pressure change being reflected back from the remote end of said hose to said pressure transducer means in the absence of a hose fault, said pressure change being reflected back from a hose location corresponding to a hose fault to said pressure transducer means in the presence of a hose fault, and hose fault detection circuit means operatively connected to said pressure transducer means to produce a first manifestation in response to a reflected pressure change indicative of the absence of a hose fault and a second manifestation in response to a reflected pressure change indicative of the presence of a hose fault, wherein said first manifestation corresponds to a reflected pressure change of the same pressure polarity as the transmitted pressure change, and said second manifestation corresponds to a reflected pressure change of a pressure polarity opposite to the pressure polarity of the transmitted pressure change.
Claim 8
Dependent Claim
239 words
In a security apparatus, including a fluid-filled pressure reponsive hose member, a pressure transducer means operatively associated with said fluid in said hose member for generating a signal indicative of changes in the fluid pressure in said hose, and an intrusion alarm circuit means operatively connected to said pressure transducer means and responsive to said signal, the combination of, a hose integrity checking means operatively associated with said fluid in said hose including means for transmitting a pressure change in said fluid to determine the presence or absence of hose faults, said pressure change being reflected back from the remote end of said hose to said pressure transducer means in the absence of a hose fault, said pressure change being reflected back from a hose location corresponding to a hose fault to said pressure transducer means in the presence of a hose fault, and hose fault detection circuit means operatively connected to said pressure transducer means to produce a first manifestation in response to a reflected pressure change indicative of the absence of a hose fault and a second manifestation in response to a reflected pressure change indicative of the presence of a hose fault, wherein said first manifestation corresponds to a reflected pressure change of the same pressure polarity as the transmitted pressure change, and said second manifestation corresponds to a reflected pressure change of a pressure polarity opposite to the pressure polarity of the transmitted pressure change.
Claim 9
Dependent Claim
57 words
In a security apparatus as claimed in claim 4 wherein said pressure transducer means responds to a reflected pressure change indicative of the absence of a hose fault by developing a first dc output signal and responds to a reflected pressure change indIcative of the presence of a hose fault by developing a second dc output signal.
References Cited (Backward Citations)
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US3304546A
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US3438021A
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US3346067A
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US3466642A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |