Patent US3601496A successfully refreshed from Google Patents.
US3601496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof blower device
Assignee: Individual
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Filing: 1969-08-27
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Granted: 1971-08-24
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Expires: 1989-08-27
Abstract
Abstract A roof blower device including a power-driven rotary frame having a plurality of vanes pivotally and serially mounted around the circumference of the frame in overlapping relationship in closed position. The rotary frame is mounted in an annular air passage so that when the frame is stationary the vanes are closed, and when the frame is rotated the overlapping vanes are swung radially outward by the centrifugal motion of the frame to open the annular air passage.
Inventors
- 👤 Bobbie Kemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:47
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02; F24F7/025; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/287
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
223 words
A blower device adapted to be mounted within a housing having at one end an axial inlet air passage, and at the other end, an annular outlet air passage, comprising: a. a rotary annular frame adapted to be rotatably mounted within the housing coaxially of the inlet air passage, b. a plurality of vanes of uniform axial width, each vane having a leading edge and a trailing edge, c. means mounting said vanes serially and circumferentially on said frame so that each trailing edge overlaps the leading edge of the adjacent trailing vane in closed position to form substantially a cylinder the height of which equals said uniform width, d. said mounting means further comprising pin means supporting a portion of each vane between its center of mass and its leading edge to pivot about an axis on said frame parallel to the rotary axis of said frame, e. means on said frame normally biasing each vane to said closed position, and f. motive means for rotating said frame in the housing in the direction of the leading edges of said vanes, whereby the resulting centrifugal forces swing said trailing edges away from said adjacent leading edges to an open position in fluid communication with the annular outlet passage, the interior of said frame being in fluid communication with the inlet air passage.
Claim 2
Dependent Claim
223 words
A blower device adapted to be mounted within a housing having at one end an axial inlet air passage, and at the other end, an annular outlet air passage, comprising: a. a rotary annular frame adapted to be rotatably mounted within the housing coaxially of the inlet air passage, b. a plurality of vanes of uniform axial width, each vane having a leading edge and a trailing edge, c. means mounting said vanes serially and circumferentially on said frame so that each trailing edge overlaps the leading edge of the adjacent trailing vane in closed position to form substantially a cylinder the height of which equals said uniform width, d. said mounting means further comprising pin means supporting a portion of each vane between its center of mass and its leading edge to pivot about an axis on said frame parallel to the rotary axis of said frame, e. means on said frame normally biasing each vane to said closed position, and f. motive means for rotating said frame in the housing in the direction of the leading edges of said vanes, whereby the resulting centrifugal forces swing said trailing edges away from said adjacent leading edges to an open position in fluid communication with the annular outlet passage, the interior of said frame being in fluid communication with the inlet air passage.
Claim 3
Dependent Claim
29 words
The invention according to claim 1 in which said vanes are of uniform length and said pivotal axes are equally spaced from each other and from said rotary axis.
Claim 4
Dependent Claim
24 words
The invention according to claim 1 in which said mounting means comprises adjustable stop means to limit outward swinging movement of said trailing edges.
Claim 5
Dependent Claim
90 words
The invention according to claim 2 in which said mounting means further comprises an arm having one end fixed to each vane and its other end free, said pin means comprising a pin pivotally securing each arm to said frame, said stop means comprising a stop pin adjustably supported in the free end of each arm to engage said frame at the maximum limit of said open position, said biasing means comprising a spring compressed between said frame and the free end of each arm urging said arm radially outward.
Claim 6
Dependent Claim
28 words
The invention according to claim 4 in which said frame comprises an annular channel rim opening radially outward for receiving said arm, said stop pin and said spring.
Claim 7
Dependent Claim
70 words
The invention according to claim 2 in which said frame is substantially a spider wheel having an annular rim, a hub, and a plurality of spokes connecting the hub and the rim, said rim supporting said vanes, said hub being operatively connected to said motive means, and each spoke having substantially the cross section of an airfoil, with its leading edge closer to the inlet passage than said trailing edge.
Claim 8
Dependent Claim
64 words
The invention according to claim 1 further comprising said housing having said axial inlet air passage at one end of said housing and said outlet annular air passage at said other end of said housing, and further comprising outlet vanes fixed in said housing adjacent and on the opposite side of said frame from said inlet passage to direct air through said outlet passage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |