US3771900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graduated screw pump
Assignee: Individual
•
Filing: 1971-10-14
•
Granted: 1973-11-13
•
Expires: 1991-10-14
Abstract
Abstract An improved pump of the rotary or centrifugal type utilizing paired, opposed, spiral ramps mounted on a rotating conical impeller within a frusto-conical housing, the ramps starting and ending approximately 180* opposed from one another and running in the same direction on the impeller hub outer surface substantially 360* each.
Inventors
- 👤 S Baehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:00
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D19/00; F04D3/00; F04D3/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
In a pump, a casing having a volute outlet chamber and a frusto-conical housing connected thereto, the large end of said frusto-conical housing opening into said volute outlet chamber, an impeller mounted to rotate within said frusto-conical housing, said impeller of substantially conical shape and concentrically mounted within said frusto-conical housing, whereby to provide a circumferential, substantially uniform width annular chamber between the outside surface of said frusto-conical impeller and the interior surface of said frusto-conical housing, a pair of spiral ramps each mounted in a helical curve around and along the outer surface of the impeller, each said Spiral ramp extending substantially 360* (making a complete circle) around said impeller and the axis of rotation thereof, said ramps starting and ending approximately 180* opposed from one another and running in the same direction on said impeller outer surface, and drive means for rotating said impeller and the ramps mounted thereon in rotation within said housing whereby to propel fluid input at the lesser diameter end of the housing and impeller therethrough, into and out of said volute outlet chamber.
Claim 2
Dependent Claim
180 words
In a pump, a casing having a volute outlet chamber and a frusto-conical housing connected thereto, the large end of said frusto-conical housing opening into said volute outlet chamber, an impeller mounted to rotate within said frusto-conical housing, said impeller of substantially conical shape and concentrically mounted within said frusto-conical housing, whereby to provide a circumferential, substantially uniform width annular chamber between the outside surface of said frusto-conical impeller and the interior surface of said frusto-conical housing, a pair of spiral ramps each mounted in a helical curve around and along the outer surface of the impeller, each said Spiral ramp extending substantially 360* (making a complete circle) around said impeller and the axis of rotation thereof, said ramps starting and ending approximately 180* opposed from one another and running in the same direction on said impeller outer surface, and drive means for rotating said impeller and the ramps mounted thereon in rotation within said housing whereby to propel fluid input at the lesser diameter end of the housing and impeller therethrough, into and out of said volute outlet chamber.
Claim 3
Dependent Claim
141 words
A device as in claim 1 wherein said volute outlet chamber increases substantially continuously in depth from an inlet end thereof towards and into an outlet end thereof substantially 360* therefrom, the transition between the inlet and the outlet ends defining the outlet orifice, the said volute chamber positioned around and outside of a central hub of outer diameter substantially equal to the larger diameter of the frusto-conical impeller, which rotates thereon as a base, the lesser diameter apex of the impeller body stopping short of the lesser diameter end of the housing, with the lesser diameter ends of the ramps extending to and aligning substantially with the lesser diameter end of the frusto-conical pump housing, and the base of the impeller extending past the largest diameter end of the frusto-conical housing together with the larger diameter ends of said ramps.
Claim 4
Dependent Claim
35 words
A device as in claim 2 wherein there is a limited zone of cylindrical form adjacent to the volute chamber and opposing the larger diameter end of the impeller into which the inclined ramps penetrate.
Claim 5
Dependent Claim
30 words
A device as in claim 1 wherein the pitch of said ramps decreases substantially continuously from the inlet end of the frusto-conical housing towards the outlet end of said housing.
Claim 6
Dependent Claim
67 words
A device as in claim 1 wherein the helical ramps, at the inlet end of the frusto-conical housing are positioned at an angle of less than 90* to the axis of rotation of the impeller away from the direction of flow into the housing and the greater diameter ends of the ramps extend at substantial right angles to the drive shaft immediately before the volute outlet chamber.
Claim 7
Dependent Claim
21 words
A device as in claim 4 wherein the pitch of each said ramp reverses from one end thereof to the other.
Claim 8
Dependent Claim
21 words
A device as in claim 5 wherein the pitch of each said ramp reverses from one end thereof to the other.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |