US3640474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impeller for heavy duty comminuting pumps
Assignee: Individual
•
Filing: 1969-02-18
•
Granted: 1972-02-08
•
Expires: 1989-02-18
Abstract
Abstract An impeller for heavy duty comminuting pumps may include a blade which is not only disposed in angular relation to its turning axis but may have an irregularly curved surface, or several such surfaces arranged to intersect each other along a line which is angularly disposed with respect to the turning axis.
Inventors
- 👤 Georg Niedl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:28
CPC Classifications
B; B02; B02C; B02C18/00; B02C18/0084; B02C18/0092; B01; B01D; B01D21/00; B01D21/0012; B01D21/26; B01D29/00; B01D29/01; B01D29/03; B01D29/035; B01D29/11; B01D29/31; B01D29/35; B01D29/50; B01D29/52; B01D29/54; B01D29/76; B01D29/86; B01D29/88; B01D29/94; B01D29/945; B01D35/00; B01D35/26; B07; B07B; B07B1/00; F; F04; F04D; F04D11/00; F04D11/005; B01D21/262; B07B2230/00; B07B2230/01
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
A pump and strainer assembly comprising a stationary pump housing having an inner wall defined by a surface of revolution forming a pump chamber in said housing, one end of said chamber being provided with an inlet, a rotary drive shaft mounted in said chamber concentric with the axis of said surface of revolution, an impeller secured to said drive shaft, a shell enclosing at least a part of said pump housing, said shell forming with the wall of said enclosed pump housing a separate outlet chamber, the portion of said housing enclosed by said shell being provided with a plurality of strainer passages, said impeller comprising a plurality of semielliptical wings, said wings being generally disposed in planes angularly related to each other and angularly related with respect to the axis of said surface of revolution.
Claim 2
Dependent Claim
137 words
A pump and strainer assembly comprising a stationary pump housing having an inner wall defined by a surface of revolution forming a pump chamber in said housing, one end of said chamber being provided with an inlet, a rotary drive shaft mounted in said chamber concentric with the axis of said surface of revolution, an impeller secured to said drive shaft, a shell enclosing at least a part of said pump housing, said shell forming with the wall of said enclosed pump housing a separate outlet chamber, the portion of said housing enclosed by said shell being provided with a plurality of strainer passages, said impeller comprising a plurality of semielliptical wings, said wings being generally disposed in planes angularly related to each other and angularly related with respect to the axis of said surface of revolution.
Claim 3
Dependent Claim
16 words
An assembly as claimed in claim 1 wherein said impeller is folded to form two wings.
Claim 4
Dependent Claim
20 words
An assembly as claimed in claim 2 wherein said wings are formed by two planes meeting along a straight line.
Claim 5
Dependent Claim
19 words
An assembly as claimed in claim 2 wherein said wings are formed by two intersecting generally arcuaTely formed members.
Claim 6
Dependent Claim
22 words
An assembly as claimed in claim 2 wherein the folding edge of the impeller is opposite the inlet of the pump chamber.
Claim 7
Dependent Claim
13 words
An assembly as claimed in claim 2 wherein said wings have different lengths.
Claim 8
Dependent Claim
46 words
An assembly as claimed in claim 1, wherein at least a portion of said inner wall defining the pump chamber is provided with a series of circumferential grooves, and the margins of said semielliptical wings are provided with teeth for operative engagement with said circumferential grooves.
References Cited (Backward Citations)
US2956503A
Cited
US3113734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |