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US4139750A
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Liquid level indicating device
Assignee: Mannesmann VDO AG
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Filing: 1977-04-05
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Granted: 1979-02-13
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Expires: 1997-04-05
Abstract
Abstract A liquid level indicating device for indicating a predetermined liquid level in a container includes a mounting member mounted on the container, a float movable with the level of liquid in the container and actuating an electrical switch when the float is at the predetermined liquid level in the container, and a coupling pivotally supporting the float on the mounting member and adjustable in orientation to permit the float to pivot in various planes. The coupling can be an angularly movable clutch such as a universal joint or a ball and socket joint or the coupling can be in the form of a resilient hinge.
Inventors
- 👤 Karl Rau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:17
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/30; G01F23/32; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32262; Y10T403/32311
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
A liquid level indicating device for indicating a predetermined liquid level in a container comprising an externally theaded mounting member in rotatable engagement with an internally threaded bore in a vertical wall of the container; float means movable with the level of liquid in the container; electrical switch means carried by said float means to be actuated when said float means is at the predetermined liquid level in the container; and universal coupling means engaging with and directly supported on said mounting member and pivotally supporting said float means and permitting said float means to pivot in various planes relative to said mounting member, including a plane oblique to the vertical wall.
Claim 2
Dependent Claim
112 words
A liquid level indicating device for indicating a predetermined liquid level in a container comprising an externally theaded mounting member in rotatable engagement with an internally threaded bore in a vertical wall of the container; float means movable with the level of liquid in the container; electrical switch means carried by said float means to be actuated when said float means is at the predetermined liquid level in the container; and universal coupling means engaging with and directly supported on said mounting member and pivotally supporting said float means and permitting said float means to pivot in various planes relative to said mounting member, including a plane oblique to the vertical wall.
Claim 3
Dependent Claim
50 words
A liquid level indicating device as recited in claim 1 wherein said universal coupling means is formed of a first shaft rotatably supported on said mounting member and a second shaft rotatably supported on said float means transverse to said first shaft, said first and second shafts being connected together.
Claim 4
Dependent Claim
21 words
A liquid level indicating device as recited in claim 2 wherein said universal coupling means includes a ball and socket coupling.
Claim 5
Dependent Claim
51 words
A liquid level indicating device as recited in claim 3 wherein said ball and socket coupling includes a pair of parallel support arms extending from said mounting member to define a concave recess and a ball supported on said float means and held in said concave recess between said support arms.
Claim 6
Dependent Claim
43 words
A liquid level indicating device as recited in claim 4 wherein said coupling means includes a screw threadedly engaging said mounting member and extending therethrough to contact said ball and permit fixing of the position of said ball relative to said support arms.
Claim 7
Dependent Claim
19 words
A liquid level indicating device as recited in claim 1 wherein said universal coupling means includes a resilient hinge.
Claim 8
Dependent Claim
27 words
A liquid level indicating device as recited in claim 6 wherein said resilient hinge includes a helical spring secured to said mounting member and said float means.
Claim 9
Dependent Claim
27 words
A liquid level indicating device as recited in claim 1 wherein said electrical switch means includes a mercury switch disposed in a recess in said float means.
Claim 10
Dependent Claim
24 words
A liquid level indicating device as recited in claim 8 wherein said recess is a hole along a longitudinal axis of said float means.
Claim 11
Dependent Claim
145 words
A liquid level indicating device for indicating a predetermined liquid level in a container comprising an externally threaded mounting member in rotatable engagement with an internally threaded bore in a vertical wall of the container; float means movable with the level of liquid in the container; electrical switch means actuated by said float means when said float means is at the predetermined liquid level in the container including a first contact carried on said mounting member and a second contact carried on said float means and adapted to engage said first contact when the liquid in the container is at the predetermined level; and universal coupling means engaging with and directly supported on said mounting member and pivotally supporting said float means and permitting said float means to pivot in various planes relative to said mounting member including a plane oblique to the vertical wall.
Claim 12
Dependent Claim
145 words
A liquid level indicating device for indicating a predetermined liquid level in a container comprising an externally threaded mounting member in rotatable engagement with an internally threaded bore in a vertical wall of the container; float means movable with the level of liquid in the container; electrical switch means actuated by said float means when said float means is at the predetermined liquid level in the container including a first contact carried on said mounting member and a second contact carried on said float means and adapted to engage said first contact when the liquid in the container is at the predetermined level; and universal coupling means engaging with and directly supported on said mounting member and pivotally supporting said float means and permitting said float means to pivot in various planes relative to said mounting member including a plane oblique to the vertical wall.
Claim 13
Dependent Claim
66 words
A liquid level indicating device as recited in claim 10 wherein said universal coupling means includes a flexible member supported on said mounting member and a rod centrally mounted on said flexible member and secured to said float means, said first contact being annular and carried on said flexible member concentric with said rod and said second contact being annular and carried on said float means.
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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) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |