US3597133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw pump with thrust absorber
Assignee: Allweiler GmbH
•
Filing: 1970-01-12
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Granted: 1971-08-03
•
Expires: 1990-01-12
Abstract
Abstract A screw pump having a driving rotor and two driven idler screws, each of which is composed of helical passages which are disposed in intermeshing relationship. Within the suction chamber a collar is mounted upon each driven screw for bearing contact relationship with the housing and simultaneously for interposition between the driving rotor and the housing to counteract or absorb the axial thrust developed by the driven screws and the rotor.
Inventors
- 👤 Josef Zeitvogel
- 👤 Siegfried Gehli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:26
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/14; F04C2/16; F04C2/165
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A screw pump comprising in combination: housing means defining a suction chamber and a pressure chamber; driven and driving means of a screwlike nature in intermeshing relationship rotatably disposed within said housing means and extending into the suction chamber; an annular collar mounted on said driven means within the area of the suction chamber and substantially at the axial end of the driven means, and interposed between the axial end of the driving means and the housing means for bearing contact relationship with the driving means.
Claim 2
Dependent Claim
86 words
A screw pump comprising in combination: housing means defining a suction chamber and a pressure chamber; driven and driving means of a screwlike nature in intermeshing relationship rotatably disposed within said housing means and extending into the suction chamber; an annular collar mounted on said driven means within the area of the suction chamber and substantially at the axial end of the driven means, and interposed between the axial end of the driving means and the housing means for bearing contact relationship with the driving means.
Claim 3
Dependent Claim
24 words
A screw pump according to claim 1, wherein said axial end of the driven means is adapted for bearing contact with said housing means.
Claim 4
Dependent Claim
24 words
A screw pump according to claim 2, wherein the outside diameter of said collar exceeds the outside diameter of the helically profiled driven means.
Claim 5
Dependent Claim
17 words
A screw pump according to claim 1, wherein said collar is rigidly secured to said driven means.
Claim 6
Dependent Claim
47 words
A screw pump according to claim 1, wherein said driving means and said driven means comprises a driving rotor and two driven idler screws, respectively, and the outside diameter of said collar approximates twice the distance between the centers of the driven screws and The driving rotor.
References Cited (Backward Citations)
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Cited
US1698802A
Cited
US1751703A
Cited
US2095167A
Cited
US2588888A
Cited
US2693762A
Cited
US3275226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |