US4094338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant rate float intake
Assignee: Individual
•
Filing: 1977-05-20
•
Granted: 1978-06-13
•
Expires: 1997-05-20
Abstract
Abstract Apparatus for achieving liquid flow at constant discharge rate from a liquid reservoir wherein the surface of liquid therein fluctuates in elevation.
Inventors
- 👤 William J. Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:09
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/01; G05D7/0166; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86236; Y10T137/86252
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
Liquid flow control apparatus for use in a reservoir of liquid of fluctuating level comprising a buoyant float member, an intake weir element carried by said float member, a conduit having one end thereof communicating with said weir element and extending downward therefrom to conduct flow by gravity of liquid from the weir, said conduit being yieldable to accommodate movement of said weir and float member, and counterbalancing springs which counterbalance the change in buoyancy as the buoyant float member and connected conduit rise and fall with the variable elevation of the liquid in which disposed.
Claim 2
Dependent Claim
96 words
Liquid flow control apparatus for use in a reservoir of liquid of fluctuating level comprising a buoyant float member, an intake weir element carried by said float member, a conduit having one end thereof communicating with said weir element and extending downward therefrom to conduct flow by gravity of liquid from the weir, said conduit being yieldable to accommodate movement of said weir and float member, and counterbalancing springs which counterbalance the change in buoyancy as the buoyant float member and connected conduit rise and fall with the variable elevation of the liquid in which disposed.
Claim 3
Dependent Claim
31 words
The apparatus of claim 1 in which the counterbalancing springs are enclosed in a freely telescoping tubular enclosure to prevent extraneous particles from becoming lodged between adjacent coils of said springs.
Claim 4
Dependent Claim
27 words
The apparatus of claim 1 in which the buoyant float member has a cut-out portion and said weir projects into said cut-out portion of the float member.
Claim 5
Dependent Claim
22 words
The apparatus of claim 1 wherein the counterbalancing springs are secured to said float member and to the bottom of the reservoir.
Claim 6
Dependent Claim
14 words
The apparatus of claim 1 wherein the counterbalancing springs are formed of stainless steel.
Claim 7
Dependent Claim
45 words
The apparatus of claim 1 wherein the counterbalancing springs possess a spring constant equal to the value of the inside cross-sectional area of said conduit multiplied by the unit weight of the liquid in the reservoir in which the liquid flow control apparatus is employed.
Claim 8
Independent Claim
133 words
A method for achieving liquid flow at constant discharge rate from a liquid reservoir wherein the surface of liquid therein fluctuates in elevation which comprises positioning on the surface of the liquid in said reservoir a buoyant float member which carries an intake weir element, connecting one end of a yieldable conduit to said weir, positioning the conduit to be submerged in the liquid in the reservoir and with the distal end of said conduit outside of said reservoir at an elevation lower than said weir whereby liquid flows from said weir through said conduit by gravity, securing counterbalancing springs to said buoyant float member whereby the springs automatically counterbalance the change in buoyancy as the buoyant float member and conduit rise and fall with the elevation of the liquid in which disposed.
Claim 9
Independent Claim
133 words
A method for achieving liquid flow at constant discharge rate from a liquid reservoir wherein the surface of liquid therein fluctuates in elevation which comprises positioning on the surface of the liquid in said reservoir a buoyant float member which carries an intake weir element, connecting one end of a yieldable conduit to said weir, positioning the conduit to be submerged in the liquid in the reservoir and with the distal end of said conduit outside of said reservoir at an elevation lower than said weir whereby liquid flows from said weir through said conduit by gravity, securing counterbalancing springs to said buoyant float member whereby the springs automatically counterbalance the change in buoyancy as the buoyant float member and conduit rise and fall with the elevation of the liquid in which disposed.
References Cited (Backward Citations)
US1108090A
Cited
US1528003A
Cited
US2023284A
Cited
US1803604A
Cited
FR669118A
Cited
US1955308A
Cited
US2679333A
Cited
DE1029302B
Cited
US3311129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |