US4289459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proportioning pump
Assignee: Individual
•
Filing: 1979-08-13
•
Granted: 1981-09-15
•
Expires: 1999-08-13
Abstract
Abstract A proportioning pump for automatic fluid analysis apparatus comprising a base having an open chamber formed in its top, a drive shaft supported in the open chamber, and a platen member that closes the top of the open chamber. A pair of roller cage assemblies each have primary bores in their end plates allowing them to be mounted on the drive shaft. The end plates are pinned to the drive shaft so that they rotate as one. Spaced outwardly a predetermined radius from the longitudinal axis of the primary bores are a plurality of secondary bores whose longitudinal axes describe circles in the laterally spaced end plates. Roller rods are journaled in the secondary bores. The outer perimeter of each of the roller rods describes an arc of a predetermined radius from the axis of the primary bore when the roller cage assembly is rotated about its longitudinal axis. The platen member has a bottom pressure surface having a predetermined concave transverse curvature which is positioned with respect to the roller cage assembly such that the spacing between the arc described by the outer surface of the roller rods and the pressure surface gradually decreases from a predetermined maximum to a predetermined minimum and then gradually increases back to a predetermined maximum. A plurality of fluid flow tubes pass in a direction transverse to the axis of the pump and are captured between the top of the roller cage assemblies and the bottom of the platen member.
Inventors
- 👤 William E. Neeley
- 👤 Terrell F. Moose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:43
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/12; F04B43/1253; F04B43/1292
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
221 words
A proportioning pump comprising: a base; a shaft having an x-axis and means for supporting it on said base; at least one roller cage assembly mounted on said shaft; said roller cage assembly comprising a pair of laterally spaced and aligned plates each having a primary bore centered on said x-axis and through which passes said shaft, spaced a predetermined radius from the longitudinal axis of said primary bores are a plurality of secondary bores whose longitudinal axes describe circles in said laterally spaced plates, roller rods are journaled in said secondary bores; elastic tubing adapted to be peristaltically compressed by said roller rods; the outer perimeter of each of said roller rods describes an arc of a predetermined radius r 1 from the x-axis of said primary bore when said roller cage assembly is rotated about its longitudinal axis; and a platen pressure surface having a concave transverse curvature of a predetermined radius r 2 , said radius r 2 being greater than r 1 and having its center positioned below said x-axis on a perpendicular line passing vertically through said x-axis whereby the spacing between the arc described by the outer surface of said roller rods and said pressure surface gradually decreases from a predetermined maximum to a predetermined minimum and then gradually increases back to a predetermined maximum.
Claim 2
Dependent Claim
221 words
A proportioning pump comprising: a base; a shaft having an x-axis and means for supporting it on said base; at least one roller cage assembly mounted on said shaft; said roller cage assembly comprising a pair of laterally spaced and aligned plates each having a primary bore centered on said x-axis and through which passes said shaft, spaced a predetermined radius from the longitudinal axis of said primary bores are a plurality of secondary bores whose longitudinal axes describe circles in said laterally spaced plates, roller rods are journaled in said secondary bores; elastic tubing adapted to be peristaltically compressed by said roller rods; the outer perimeter of each of said roller rods describes an arc of a predetermined radius r 1 from the x-axis of said primary bore when said roller cage assembly is rotated about its longitudinal axis; and a platen pressure surface having a concave transverse curvature of a predetermined radius r 2 , said radius r 2 being greater than r 1 and having its center positioned below said x-axis on a perpendicular line passing vertically through said x-axis whereby the spacing between the arc described by the outer surface of said roller rods and said pressure surface gradually decreases from a predetermined maximum to a predetermined minimum and then gradually increases back to a predetermined maximum.
Claim 3
Dependent Claim
40 words
A proportioning pump as recited in claim 1 wherein said base has an open chamber formed in its top by a bottom wall portion and at least two laterally spaced upstanding walls, said shaft being supported in said open chamber.
Claim 4
Dependent Claim
29 words
A proportioning pump as recited in claim 2 wherein said platen pressure surface is on the bottom of a platen member that closes the top of said open chamber.
Claim 5
Dependent Claim
28 words
A proportioning pump as recited in claim 3 wherein said platen member has a plurality of roller cage assembly end plate recesses formed in its platen pressure surface.
Claim 6
Dependent Claim
49 words
A proportioning pump as recited in claim 2 wherein said means for supporting said shaft comprises a pair of laterally spaced mounting plates located adjacent the opposite ends of said shaft that have bearings in their bores to allow said shaft to rotate while said mounting plates remain stationary.
Claim 7
Dependent Claim
44 words
A proportioning pump as recited in claim 2 wherein said laterally spaced upstanding walls have means along their top surface for spacing and positioning flexible fluid flow tubes that pass through said proportioning pump between said roller cage assembly and said platen pressure surface.
Claim 8
Dependent Claim
23 words
A proportioning pump as recited in claim 1 further comprising means for making the roller cage assembly rotate when said shaft is rotated.
Claim 9
Dependent Claim
44 words
A proportioning pump as recited in claim 7 wherein said means for making said roller cage assembly rotate when said shaft is rotated comprises a pin passing through aligned transverse bores in said shaft and one of said plates of said roller cage assembly.
Claim 10
Dependent Claim
52 words
A proportioning pump as recited in claim 1 further comprising at least one idler pressure wheel journaled on said shaft within the interior of said roller cage assembly with the outer lateral surface of said idler pressure wheel being in substantial surface contact with the interior lateral surface of said roller rods.
Claim 11
Dependent Claim
48 words
A proportioning pump as recited in claim 1 wherein there are at least two roller cage assemblies on said shaft and there is an intermediate mounting plate on said shaft between said roller cage assemblies, said shaft being journaled in an axial bore of said intermediate mounting plate.
References Cited (Backward Citations)
US2935028A
Cited
FR1331167A
Cited
US3433170A
Cited
US3386382A
Cited
US3507585A
Cited
US3723030A
Cited
US3732042A
Cited
DE2141352A1
Cited
US3740173A
Cited
US3990444A
Cited
DE2525744A1
Cited
US4205948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |