US3846040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blower housing
Assignee: Individual
•
Filing: 1972-06-16
•
Granted: 1974-11-05
•
Expires: 1992-06-16
Abstract
Abstract Disclosed is scroll type blower housing having a non-uniform expansion rate. The periphery is generally curved to form a scroll of linear expansion angle from the cut-off but has at least one flat wall segment within the first 200* which reduces the radius of the scroll in that area to less than the radius required for a linear expansion angle.
Inventors
- 👤 D Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:41
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/4206; F04D29/4226
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
50 words
Housing apparatus for a blower wheel having a radial periphery generally defining a curved scroll expanding at a linear expansion angle fRom the cut-off and having a first flat wall segment within the first 200* from the cut-off and a second flat wall segment adjacent said first flat wall segment.
Claim 2
Dependent Claim
50 words
Housing apparatus for a blower wheel having a radial periphery generally defining a curved scroll expanding at a linear expansion angle fRom the cut-off and having a first flat wall segment within the first 200* from the cut-off and a second flat wall segment adjacent said first flat wall segment.
Claim 3
Dependent Claim
24 words
Apparatus as defined in claim 1 wherein the radii at the ends of said second flat wall segments define an angle of about 45*.
Claim 4
Dependent Claim
93 words
Apparatus as defined in claim 2 wherein said radius nearest the cut-off is about 95 percent of the length required to define a scroll having a linear expansion angle, the radius at the adjacent ends of said first and second flat segments is about 80 percent of the length required to define a scroll having a linear expansion angle, and the radius of the scroll at the end of said flat segment furthermost from the cut-off is about 96 percent of the length required to define a scroll having a linear expansion angle.
Claim 5
Dependent Claim
18 words
Apparatus as defined in claim 3 wherein said radius nearest the cut-off is about 71* from the cut-off.
References Cited (Backward Citations)
US1014321A
Cited
FR577051A
Cited
US2457142A
Cited
US2659294A
Cited
US2994348A
Cited
US3561906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |