Patent US3791280A successfully refreshed from Google Patents.
US3791280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screened ventilator
Assignee: Individual
•
Filing: 1972-09-14
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Granted: 1974-02-12
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Expires: 1992-09-14
Abstract
Abstract A ventilator for a building having a plurality of inclined louver blades and a plurality of longitudinally pivoted screen sections normally biased into engagement with portions of the adjacent louver sections to form a screen. If the screens become temporarily clogged as with ice or frost, the differential air pressure on opposite sides of the screen sections causes them to swing open against their bias to enable passage of air through the ventilator.
Inventors
- 👤 J Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:31
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/15
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
204 words
A ventilator for a building comprising: a frame designed for installation within a wall opening of a building, a plurality of generally parallel louver blades fixedly disposed in said frame, the longitudinal axis of each blade extending generally horizontally and with each blade being inclined so that the inner edge of the blade is substantially higher than the outer edge, a plurality of screen sections, each of a width somewhat greater than the width of the space between adjacent louvers, means for mounting each of said screen sections in said frame member for swinging about a longitudinal axis, said axis being located intermediate adjacent louvers in such a position that the upper and lower edges of each screen section normally abut opposite louver blades, and means for yieldably biasing said screen sections into such abutment with adjacent louver blades, said longitudinal axes of rotation of said screen sections being displaced transversely from the longitudinal center of said screen sections so that if said screens become temporarily clogged, a pressure differential on opposite sides of said screen sections will cause said screen sections to swing away from engagement with said louver blades to permit passage of air between said screen sections and said louver blades.
Claim 2
Dependent Claim
204 words
A ventilator for a building comprising: a frame designed for installation within a wall opening of a building, a plurality of generally parallel louver blades fixedly disposed in said frame, the longitudinal axis of each blade extending generally horizontally and with each blade being inclined so that the inner edge of the blade is substantially higher than the outer edge, a plurality of screen sections, each of a width somewhat greater than the width of the space between adjacent louvers, means for mounting each of said screen sections in said frame member for swinging about a longitudinal axis, said axis being located intermediate adjacent louvers in such a position that the upper and lower edges of each screen section normally abut opposite louver blades, and means for yieldably biasing said screen sections into such abutment with adjacent louver blades, said longitudinal axes of rotation of said screen sections being displaced transversely from the longitudinal center of said screen sections so that if said screens become temporarily clogged, a pressure differential on opposite sides of said screen sections will cause said screen sections to swing away from engagement with said louver blades to permit passage of air between said screen sections and said louver blades.
Claim 3
Dependent Claim
37 words
The ventilator of claim 1 in which said biasing means is a single biasing means connected to each of said screen sections at a point transversely spaced from the longitudinal axis of rotation of the screen section.
Claim 4
Dependent Claim
26 words
The ventilator of claim 1 in which the ventilator is mounted so as to constitute an air inlet and in which the screen sections swing inwardly.
Claim 5
Dependent Claim
63 words
The ventilator of claim 1 in which the longitudinal axis of rotation of the screen sections is not only displaced transversely from the longitudinal center of the screens, but also from both the upper and lower edges of the screen sections so that when said screen sections swing away from the louver blades they are spaced from both of the adjacent louver blades.
Claim 6
Dependent Claim
40 words
The ventilator of claim 1 in which the upper edge of each of said screen section engages an inner surface of the louver blade above it and the lower edge engages an outer surface of the louver blade below it.
Claim 7
Dependent Claim
78 words
The ventilator of claim 3 in which the longitudinal axes of rotation of said screen sections are beneath the longitudinal centers of said screen sections and in which when said sections are in engagement with the louver blades, the plane of each screen section slopes inwardly from bottom to top so that the weight of any matter clogging the screen tends to urge the screen sections away from the louver blades against the action of the biasing means.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |