US3896281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically actuated liquid level signalling device
Assignee: Individual
•
Filing: 1973-11-07
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Granted: 1975-07-22
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Expires: 1993-11-07
Abstract
Abstract A liquid level signalling device comprising a stationary magnet mounted in a housing of the device, a magnetically driven contact located in the stray field of the stationary magnet, and a movable magnet connected to a float by means of a flexible link, the float co-operating with the liquid being controlled. The stationary magnet is permanently positioned relative to the movable magnet so that the two magnets face each other with opposite poles. The movable magnet is accommodated in the housing at a distance from the stationary magnet which ensures its attraction thereby upon immersing the float into the liquid. The movable magnet compensates for the action of the magnet stray flux upon the magnetically driven contact.
Inventors
- 👤 Evgeny Ilich Feoktistov
- 👤 Evgeny Arkadievich Chechulin
- 👤 Nikolai Semenovich Zonov
- 👤 Leonid Kronidovich Prozorov
- 👤 Jury Maximovich Poskryakov
- 👤 Grigory Grigorievich Kremennoi
- 👤 Vladimir Mikhailovich Goryachy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:45
CPC Classifications
H; H01; H01H; H01H36/00; H01H36/02; G; G01; G01F; G01F23/00; G01F23/30; G01F23/40; H01H36/0006; H01H36/0013; H01H36/0026
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
271 words
A liquid level signalling device controlling the level of liquid in a reservoir comprising: a housing having an upper and lower part separated by a non-magnetic partition and rigidly attached to said reservoir; a first magnet stationarily fixed in the lower part of said housing; a second magnet accomodated in the lower part of said housing beneath said first magnet and at a predetermined distance therefrom so as to be movable toward and away from said first magnet, said second magnet being movably positioned relative to the first magnet for continuous magnetic attraction therebetween so that the poles of said first magnet face the poles of the second magnet having opposite polarity; a float floatably co-operating with the level of liquid being controlled in the reservoir; a flexible link connecting said second magnet to said float to move therewith and relative to said first magnet according to movements of the level of the liquid in the reservoir; a magnetically driven contact mounted in the upper part of said housing in the stray magnetic flux field of said first magnet, said second magnet compensating for the action of the stray magnetic flux of said first magnet upon said magnetically driven contact whereby when the level of the liquid in the reservoir falls, the second magnet moves away from the first magnet and the stray flux of said first magnet in the vicinity of said contact increases to close said contact, and when the level of the liquid in the reservoir rises the stray flux of said first magnet in the vicinity of said contact decreases to thereby open said magnetically driven contact.
Claim 2
Dependent Claim
271 words
A liquid level signalling device controlling the level of liquid in a reservoir comprising: a housing having an upper and lower part separated by a non-magnetic partition and rigidly attached to said reservoir; a first magnet stationarily fixed in the lower part of said housing; a second magnet accomodated in the lower part of said housing beneath said first magnet and at a predetermined distance therefrom so as to be movable toward and away from said first magnet, said second magnet being movably positioned relative to the first magnet for continuous magnetic attraction therebetween so that the poles of said first magnet face the poles of the second magnet having opposite polarity; a float floatably co-operating with the level of liquid being controlled in the reservoir; a flexible link connecting said second magnet to said float to move therewith and relative to said first magnet according to movements of the level of the liquid in the reservoir; a magnetically driven contact mounted in the upper part of said housing in the stray magnetic flux field of said first magnet, said second magnet compensating for the action of the stray magnetic flux of said first magnet upon said magnetically driven contact whereby when the level of the liquid in the reservoir falls, the second magnet moves away from the first magnet and the stray flux of said first magnet in the vicinity of said contact increases to close said contact, and when the level of the liquid in the reservoir rises the stray flux of said first magnet in the vicinity of said contact decreases to thereby open said magnetically driven contact.
Claim 3
Dependent Claim
28 words
A liquid level signalling device as claimed in claim 1, wherein said float has a volume gravity substantially equal to the specific gravity of the liquid being controlled.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |