US3751616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Float switches
Assignee: TRIST CONTROLS Ltd RONALD
•
Filing: 1972-06-28
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Granted: 1973-08-07
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Expires: 1992-06-28
Abstract
Abstract An electrical switch assembly, for measuring liquid levels or flow, has a mounting plate which is arranged to be fitted to a container wall to seal an aperture through the wall; a tube which is made of a non-magnetic material, which extends through and is sealed in a bore in the plate, and which has its end on the wet side of the plate sealed; a sensing element which is arranged to be moved by the liquid in the container and a magnet which, with the sensing element, is pivotally mounted on the wet side of the mounting plate; a magnetically responsive switch contact unit within the tube and responsive to movement of the magnet upon movement of the sensing element; and a terminal housing mounted on the dry side of the mounting plate and incorporating terminals connected to the switch contact unit.
Inventors
- 👤 R Innes
- 👤 N West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:09
CPC Classifications
H; H01; H01H; H01H36/00; H01H36/02; G; G01; G01F; G01F23/00; G01F23/30; G01F23/32; G01F23/38
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
161 words
An electrical switch assembly, for measuring liquid levels or flow, Comprising a mounting plate which is arranged to be fixed to a container wall to seal an aperture through said container wall; a tube which is made of a non-magnetic material, which extends through and is sealed in a bore in said plate, which is expanded at two annular rings into tight sealing engagement with the wall of said bore, and which has its end on the wet side of said plate sealed; a sensing element which is arranged to be moved by the liquid in said container and a magnet which, with said sensing element, is pivotally mounted on said wet side of said mounting plate; a magnetically responsive switch contact unit within said tube and responsive to movement of said magnet upon movement of said sensing element; and a terminal housing mounted on the dry side of said mounting plate and incorporating terminals connected to said switch contact unit.
Claim 2
Dependent Claim
161 words
An electrical switch assembly, for measuring liquid levels or flow, Comprising a mounting plate which is arranged to be fixed to a container wall to seal an aperture through said container wall; a tube which is made of a non-magnetic material, which extends through and is sealed in a bore in said plate, which is expanded at two annular rings into tight sealing engagement with the wall of said bore, and which has its end on the wet side of said plate sealed; a sensing element which is arranged to be moved by the liquid in said container and a magnet which, with said sensing element, is pivotally mounted on said wet side of said mounting plate; a magnetically responsive switch contact unit within said tube and responsive to movement of said magnet upon movement of said sensing element; and a terminal housing mounted on the dry side of said mounting plate and incorporating terminals connected to said switch contact unit.
Claim 3
Dependent Claim
17 words
An electrical switch assembly according to claim 1, in which said tube is made of stainless steel.
Claim 4
Dependent Claim
24 words
An electrical switch assembly according to claim 1, in which said sensing element and magnet are mounted on the sealed end of said tube.
Claim 5
Dependent Claim
29 words
An electrical switch assembly according to claim 1, in which said sensing element is a float, and the assembly is adapted for use in the measurement of liquid levels.
Claim 6
Dependent Claim
29 words
An electrical switch assembly according to claim 1, in which said sensing element is a paddle, and the assembly is adapted for use in the measurement of liquid flows.
Claim 7
Dependent Claim
16 words
An electrical switch assembly according to claim 1, in which said switch is a reed switch.
Claim 8
Dependent Claim
24 words
An electrical switch assembly according to claim 1, in Which said switch is a micro-switch, an arm of the micro-switch co-operating with said magnet.
References Cited (Backward Citations)
US2927176A
Cited
US2857492A
Cited
US2887546A
Cited
US3322917A
Cited
US3359385A
Cited
US3421124A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |