US3835700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel meter
Assignee: HIRD BROWN INSTRUMENTTIN Ltd A CORP OF UNITED KINGDOM
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Filing: 1973-06-28
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Granted: 1974-09-17
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Expires: 1993-06-28
Abstract
Abstract A meter for fuel or other liquid using an upstanding precision bore for containing the liquid and a pressure transducer disposed in the lower part of the tube to generate electrical signals dependent on the liquid level of the same. A control system and trip means registers the time elapsing as liquid is withdrawn from the tube between two selected liquid levels, to cause the tube to be refilled at a further level and to disable the meter and actuate an alarm at a fourth level signal. An electronic differentiator provides rate of change signals from the pressure dependent signals for logging, indication and the like, and the output of the differentiator can be held at a selected level signal for the refilling of the tube.
Inventors
- 👤 P Gamble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:47
CPC Classifications
G; G01; G01F; G01F3/00; G01F3/36; G01F3/38; G01F1/00; G01F1/007; G01F9/00; G01F9/001; G01F9/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A liquid meter comprising an upstanding precision bore tube for containing the liquid, a pressure transducer disposed in a lower region of the tube and constructed to give a signal dependent on the liquid level in the tube, trip means responsive to such level signal and constructed to trip at not less than two trip levels, and a control system associated with the trip means, the control system being operable to register the time elapsing as liquid is withdrawn from the tube between tripping at one and another of the said two trip levels.
Claim 2
Dependent Claim
94 words
A liquid meter comprising an upstanding precision bore tube for containing the liquid, a pressure transducer disposed in a lower region of the tube and constructed to give a signal dependent on the liquid level in the tube, trip means responsive to such level signal and constructed to trip at not less than two trip levels, and a control system associated with the trip means, the control system being operable to register the time elapsing as liquid is withdrawn from the tube between tripping at one and another of the said two trip levels.
Claim 3
Dependent Claim
62 words
A liquid meter according to claim 1 in which the trip means includes a first trip level representative of a greater weight of liquid in the tube than the said two trip levels, the latter being respectively termed the second and third trip levels, with refilling of the tube with the liquid being initiated by the tripping at the third trip level.
Claim 4
Dependent Claim
74 words
A liquid meter according to claim 2 in which the trip means is constructed to trip at a fourth trip level corresponding to a smaller quantity of liquid in the tube than the first, second, or third trip levels, and in which an alarm device is included, connected so that the tripping of the trip means at the fourth level signal is used to shut the meter down and to actuate the alarm device.
Claim 5
Dependent Claim
30 words
A liquid meter according to claim 3 in which a differentiating circuit is included whose output is fed to indicator means to give a direct display of fuel consumption rate.
Claim 6
Dependent Claim
39 words
A liquid meter according to claim 2 in which the control system includes a time counter circuit and the second trip level signal starts the operation of the time counter circuit and the third trip level signal stops it.
Claim 7
Dependent Claim
45 words
A liquid meter according to claim 2 in which the signal at the third trip level is arranged to hold the output of the differentiator circuit at the level signal reached at the third trip level until the second trip level is reached by refilling.
Claim 8
Dependent Claim
160 words
The combination comprising a fuel supply system for an engine and a liquid meter, the liquid meter comprising an upstanding precision bore tube for containing the liquid, a pressure transducer disposed in a lower region of the tube and constructed to give a signal dependent of the liquid level in the tube, trip means responsive to the level signal constructed to trip at not less than two trip levels, and a control system associated with the trip device, the control system being operable to register the time elapsing as liquid is withdrawn from the tube between tripping at one and another of the said two trip levels, and the fuel supply system comprising a first tube for supplying fuel from a supply tank via first valve means to a second tube, the latter being adapted for connection to an engine, and a branch tube off the second tube and connected via second valve means to the high precision bore tube.
Claim 9
Dependent Claim
160 words
The combination comprising a fuel supply system for an engine and a liquid meter, the liquid meter comprising an upstanding precision bore tube for containing the liquid, a pressure transducer disposed in a lower region of the tube and constructed to give a signal dependent of the liquid level in the tube, trip means responsive to the level signal constructed to trip at not less than two trip levels, and a control system associated with the trip device, the control system being operable to register the time elapsing as liquid is withdrawn from the tube between tripping at one and another of the said two trip levels, and the fuel supply system comprising a first tube for supplying fuel from a supply tank via first valve means to a second tube, the latter being adapted for connection to an engine, and a branch tube off the second tube and connected via second valve means to the high precision bore tube.
Claim 10
Dependent Claim
38 words
The combination according to claim 7 including a branch tube off the second tube and, connected to the branch tube, a capacity smoothing device for smoothing out unwanted pressure pulses in the fluid being fed to the engine.
Claim 11
Dependent Claim
36 words
The combination according to claim 8 in which the capacity smoothing device is formed by a chamber open to the fuel and partly bounded by a resilient diaphragm whose other side is open to ambient atmosphere.
References Cited (Backward Citations)
US2764645A
Cited
US2841011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |