US3656871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump unit
Assignee: Xylem Water Solutions AB
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Filing: 1970-03-24
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Granted: 1972-04-18
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Expires: 1990-03-24
Abstract
Abstract An immersible centrifugal pump unit which when lifted out of and lowered into a liquid is steered on a guide. The pump has a liquid outlet with a connecting flange parallel to the guide. The flange is sealed against a flange of an outlet pipe when the pump is submerged and brought into contact with the outlet pipe. A gripper on the pump engages the flange on the outlet pipe to hold the pump flange against the flange of the outlet pipe. The uppermost part of the opposing flange surfaces are at a level not higher than the lowermost point of engagement of the gripper and the flange of the outlet pipe.
Inventors
- 👤 Konrad Valdemar Carlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:13
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/60; F04D29/605; F04D29/606; F04D29/607; F16; F16L; F16L37/00; F16L37/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
An immersible pump unit for connection to an outlet pipe having a first flange, said pump unit comprising: a. a pump; b. a liquidtight electric motor; c. guide means for guiding said unit for engagement with said outlet pipe; d. a second flange on the outlet of said unit and parallel to said guide means; and e. gripper means coupled to the exterior of said unit for engaging said first flange such that said first flange and said second flange are held together to form a liquidtight passage between said outlet pipe and said unit, and the lowermost point of engagement between said gripper means and said first flange is above or at the highest point at which said first and second flanges come together and said lowermost point is above the upper surface of said outlet whereby mutual interlocking between said first and second flanges is prevented.
Claim 2
Dependent Claim
148 words
An immersible pump unit for connection to an outlet pipe having a first flange, said pump unit comprising: a. a pump; b. a liquidtight electric motor; c. guide means for guiding said unit for engagement with said outlet pipe; d. a second flange on the outlet of said unit and parallel to said guide means; and e. gripper means coupled to the exterior of said unit for engaging said first flange such that said first flange and said second flange are held together to form a liquidtight passage between said outlet pipe and said unit, and the lowermost point of engagement between said gripper means and said first flange is above or at the highest point at which said first and second flanges come together and said lowermost point is above the upper surface of said outlet whereby mutual interlocking between said first and second flanges is prevented.
Claim 3
Dependent Claim
57 words
The apparatus as set forth in claim 1 wherein said first flange is chamfered at its upper portion and said second flange is chamfered at its lower portion whereby the upper portion of said first flange and the lower portion of said second flange temporarily engage when said unit is moved into engagement with said outlet pipe.
Claim 4
Dependent Claim
53 words
The apparatus as set forth in claim 1 wherein the surface of said first flange furthest from said unit includes a shoulder surface oblique to the surface nearest the unit such that said gripper means engages said first flange on said shoulder thereby forming a tight seal between said first and second flanges.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |