US3748656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for monitoring pressure variations in a fluid pressure system
Assignee: Textron Inc
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Filing: 1971-11-08
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Granted: 1973-07-24
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Expires: 1991-11-08
Abstract
Abstract Pressure transducer means for sensing system pressure and providing a signal proportional thereto is connected to an electrical differentiator which provides an electrical signal which is proportional to the rate of change of system pressure. The rate of change of system pressure electrical signal is then compared to a predetermined reference signal to provide an output electrical signal only when the rate of change signal equals or exceeds the reference signal for a predetermined period of time. The output signal is utilized to actuate a device or sound a warning as may be required.
Inventors
- 👤 S Gray
- 👤 A Perello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:51
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/28; G01M3/2807; G01M3/2815
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
162 words
Electronic apparatus for developing an output signal responsive to a decrease in pressure of predetermined magnitude representative of a rupture in a fluid handling system comprising: transducer means for receiving system fluid pressure and generating a firSt electrical signal proportional to the rate of change of system fluid pressure; detector means for comparing said first electrical signal to a predetermined electrical reference and for producing a second electrical signal only when said first electrical signal is representative of said decrease in pressure and thereby equals or exceeds said reference; means connecting said first electrical signal to said detector means; actuating signal generator means responsive to production of said second electrical signal for delaying effectiveness of said second electrical signal until expiration of a predetermined period of time and for producing an actuating signal only when said second electrical signal is maintained for at least said predetermined period of time; and means connecting said second electrical signal to said actuating signal generator means.
Claim 2
Dependent Claim
162 words
Electronic apparatus for developing an output signal responsive to a decrease in pressure of predetermined magnitude representative of a rupture in a fluid handling system comprising: transducer means for receiving system fluid pressure and generating a firSt electrical signal proportional to the rate of change of system fluid pressure; detector means for comparing said first electrical signal to a predetermined electrical reference and for producing a second electrical signal only when said first electrical signal is representative of said decrease in pressure and thereby equals or exceeds said reference; means connecting said first electrical signal to said detector means; actuating signal generator means responsive to production of said second electrical signal for delaying effectiveness of said second electrical signal until expiration of a predetermined period of time and for producing an actuating signal only when said second electrical signal is maintained for at least said predetermined period of time; and means connecting said second electrical signal to said actuating signal generator means.
Claim 3
Dependent Claim
54 words
Apparatus according to claim 1 wherein said transducer means includes a pressure to electrical signal transducer connected to system pressure for providing an electrical signal proportional to system pressure and electrical signal differentiator means connected to receive said electrical signal from said transducer and to provide said signal proportional to said rate of change.
Claim 4
Dependent Claim
13 words
Apparatus according to claim 2 wherein said differentiator means is an active differentiator.
Claim 5
Dependent Claim
27 words
Apparatus according to claim 2 wherein said transducer means further includes a low pass filter means connected to receive said signal proportional to said rate of change.
Claim 6
Dependent Claim
16 words
Apparatus according to claim 4 wherein said low pass filter means includes an active integrator means.
Claim 7
Dependent Claim
29 words
Apparatus according to claim 1 wherein said detector means includes a threshold detector for producing an output signal only when said first electrical signal equals or exceeds said reference.
Claim 8
Dependent Claim
30 words
Apparatus according to claim 6 wherein said threshold detector includes transient signal detecting means for rendering said threshold detector effective only in the presence of a continuing first electrical signal.
Claim 9
Dependent Claim
109 words
Apparatus according to claim 7 wherein said transient detecting means includes switch means for applying an electrical signal to the output of said threshold detector, signal level detecting means connected to cause said switch means to apply said electrical signal to said output only when said first electrical signal is equal to or exceeds said reference, electrical pulse producing means responsive to said switch means applying said electrical signal to said output of said threshold detector for producing an electrical pulse a predetermined period of time after said application to said output terminal, and means for applying said pulse to said switch means for rendering said switch means ineffective.
Claim 10
Dependent Claim
22 words
Apparatus according to claim 8 wherein said switch means is a normally non-conducting SCR and said pulse producing means is an oscillator.
Claim 11
Dependent Claim
17 words
Apparatus according to claim 9 wherein said signal level detecting means is a first programmable unijunction transistor.
Claim 12
Dependent Claim
60 words
Apparatus according to claim 1 wherein said actuating signal generator includes a second programmable unijunction transistor and electronic switch means, said second programmable unijunction transistor being conductive only when said second electrical signal is maintained for said predetermined period of time, said electronic switch means being responsive to said second programmable unijunction transistor becoming conductive to produce said actuating signal.
Claim 13
Dependent Claim
41 words
Apparatus according to claim 11 which further includes pulse generator means responsive to said electronic switch means producing said actuating signal to produce a pulse means coupling said pulse to said electronic switch means for rendering said electronic switch means ineffective.
Claim 14
Dependent Claim
148 words
Electronic apparatus for developing an output signal responsive to a decrease in pressure of predetermined magnitude representative of a rupture in a fluid handling system comprising: transducer means for receivinG system fluid pressure and generating a first electrical signal representative of changes in system fluid pressure; means providing a reference electrical signal; detector means for comparing said first electrical signal to said electrical reference signal and for producing a second electrical signal only when said first electrical signal is representative of said decrease in pressure and thereby differs in a predetermined fashion from said reference signal; means connecting said first electrical signal and said reference signal to said detector means; actuator signal generator means responsive to production of said second electrical signal for initiating a timing period for controlling effectiveness of said second electrical signal; and means for connecting said second electrical signal to said actuating generator means.
Claim 15
Dependent Claim
148 words
Electronic apparatus for developing an output signal responsive to a decrease in pressure of predetermined magnitude representative of a rupture in a fluid handling system comprising: transducer means for receivinG system fluid pressure and generating a first electrical signal representative of changes in system fluid pressure; means providing a reference electrical signal; detector means for comparing said first electrical signal to said electrical reference signal and for producing a second electrical signal only when said first electrical signal is representative of said decrease in pressure and thereby differs in a predetermined fashion from said reference signal; means connecting said first electrical signal and said reference signal to said detector means; actuator signal generator means responsive to production of said second electrical signal for initiating a timing period for controlling effectiveness of said second electrical signal; and means for connecting said second electrical signal to said actuating generator means.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |