Patent US3786996A successfully refreshed from Google Patents.
US3786996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial flow unit
Assignee: AIRSONIC INTERNATIONAL Inc A CORP OF FLORIDA
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Filing: 1972-03-20
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Granted: 1974-01-22
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Expires: 1992-03-20
Abstract
Abstract An axial flow unit is provided having a cylindrical rotor with impeller blades extending radially inwardly from the inside wall of the rotor and terminating in an elongated knife-like cutting edge. The radial distance of the cutting edge of each blade from the inside rotor wall progressively increases from one end of the blade toward its opposite end. The blades are arranged in helical symmetrical relation about the major longitudinal axis of the rotor, and a blade profile in a plane normal to that axis provides a projection with each blade in spaced relation to an adjacent blade.
Inventors
- 👤 H Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:35
CPC Classifications
F; F04; F04D; F04D3/00; F04D29/00; F04D29/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
157 words
An axial flow device comprising a housing, a hollow rotor supported on the housing and having inlet and outlet ends with a flow passageway therebetween, and a blade mounted on and projecting radially inwardly from an inside wall surface of the rotor, the blade having an upstream end and a downstream end with a longitudinally extending cutting edge extending at least in part therebetween, at least a portion of the blade cutting edge being disposed at an increasing radial distance from the inside wall surface of the rotor progressively along said cutting edge portion in a direction from the inlet toward the outlet ends of the rotor, the projection of the blade in a plane normal to a major longitudinal axis of the rotor defining a concave blade profile wherein the edge of the blade from its down-stream end toward its upstream end is curved inwardly toward the inside wall surface of the rotor adjacent the blade.
Claim 2
Dependent Claim
157 words
An axial flow device comprising a housing, a hollow rotor supported on the housing and having inlet and outlet ends with a flow passageway therebetween, and a blade mounted on and projecting radially inwardly from an inside wall surface of the rotor, the blade having an upstream end and a downstream end with a longitudinally extending cutting edge extending at least in part therebetween, at least a portion of the blade cutting edge being disposed at an increasing radial distance from the inside wall surface of the rotor progressively along said cutting edge portion in a direction from the inlet toward the outlet ends of the rotor, the projection of the blade in a plane normal to a major longitudinal axis of the rotor defining a concave blade profile wherein the edge of the blade from its down-stream end toward its upstream end is curved inwardly toward the inside wall surface of the rotor adjacent the blade.
Claim 3
Dependent Claim
52 words
The device of claim 1 wherein the blade terminates in a radially inwardly projecting cutting edge extending along the entire length of the blade between its upstream and downstream ends, and wherein the projecting cutting edge of the blade is formed on a detachable elongated knife member removably secured to the blade.
Claim 4
Dependent Claim
78 words
The device of claim 1 further including at least one other blade mounted on the inside wall surface of the rotor in addition to said one blade, the blades being of substantially identical construction with each blade having corresponding variations in the radial positioning of the blade cutting edge relative to the inside wall surface of the rotor, the blades being generally helical and spaced apart on the rotor in a symmetrical arrangement about its major longitudinal axis.
Claim 5
Dependent Claim
29 words
The device of claim 3 wherein each blade is dimensioned such that its maximum radial distance from the inside wall surface of the rotor is less than its radius.
Claim 6
Dependent Claim
35 words
The device of claim 3 wherein the projection of the blades in a plane normal to the major axis of the rotor defines a blade profile with each blade spaced apart from the adjacent blade.
Claim 7
Dependent Claim
18 words
The device of claim 3 wherein the blades each have generally equal pitch and substantially the same lead.
Claim 8
Dependent Claim
59 words
The device of claim 3 wherein n is the number of blades, wherein each of the blades have a selected pitch and lead such that a projection of each blade in a plane normal to the major axis of the rotor extends a distance less than 1/n of the circumferential distance about the inside wall surface of the rotor.
Claim 9
Dependent Claim
37 words
The device of claim 1 wherein the blade is formed with a cross section of progressively reduced thickness in a direction extending from the inside wall surface of the rotor toward the cutting edge of the blade.
References Cited (Backward Citations)
US456352A
Cited
US1326730A
Cited
US1916192A
Cited
US2997015A
Cited
US3168255A
Cited
US3276382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |