Patent US4353192A successfully refreshed from Google Patents.
US4353192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-resistant metal stud
Assignee: Phillips Manufacturing Co
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Filing: 1976-10-08
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Granted: 1982-10-12
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Expires: 1996-10-08
Abstract
Abstract A formed sheet metal stud having a flange on the opposite side of the wall from that which is exposed to a fire, which flange is formed by a double thickness of the sheet metal which is loosely folded, leaving a finite space between the two thicknesses to function as a chimney, providing a cooling effect on portions of the stud adjacent the highest temperatures of the fire. Small holes are formed in the outer face of the loosely folded flange to permit cooler air from the unexposed side of the stud to enter the void within the loosely folded flange, where the air rises and cools the stud, and/or they permit heated air rising within the void to escape.
Inventors
- 👤 Robert J. Pearson
- 👤 Rodney G. Buergin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:58
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; E04B1/941; E04B1/943; E04B2/00; E04B2/74; E04B2/7407; E04B2/7409; E04B2/7411
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
A fire-resistant metal stud for supporting a vertical wall comprising an elongate formed sheet metal body having an elongate first side and, opposite thereto, an elongate second side, elongate means central thereof adjoining said first side and said second side, means on said second side for affixing wallboard thereto, a pair of flanges on said first side adapted to have the edges of a pair of wallboards affixed against the inner side thereof, whereby said flanges would be disposed on the surface of a wall formed by said wallboards, said pair of flanges including at least one flange which is formed from an inner layer sheet of metal extending from the inner edge of the flange to the outer edge of the flange whereat the metal is reversely folded and extends back to said inner edge forming an outer layer, said inner layer and said outer layer being closely spaced apart and parallel, whereby air that becomes heated will tend to move vertically upward within a gap between said inner layer and said outer layer.
Claim 2
Dependent Claim
175 words
A fire-resistant metal stud for supporting a vertical wall comprising an elongate formed sheet metal body having an elongate first side and, opposite thereto, an elongate second side, elongate means central thereof adjoining said first side and said second side, means on said second side for affixing wallboard thereto, a pair of flanges on said first side adapted to have the edges of a pair of wallboards affixed against the inner side thereof, whereby said flanges would be disposed on the surface of a wall formed by said wallboards, said pair of flanges including at least one flange which is formed from an inner layer sheet of metal extending from the inner edge of the flange to the outer edge of the flange whereat the metal is reversely folded and extends back to said inner edge forming an outer layer, said inner layer and said outer layer being closely spaced apart and parallel, whereby air that becomes heated will tend to move vertically upward within a gap between said inner layer and said outer layer.
Claim 3
Dependent Claim
52 words
A fire-resistant wall, comprising a plurality of vertically disposed studs as defined in claim 1 and a plurality of wallboards supported by said studs, means for air to enter said gap prior to moving vertically upward therewithin and means for air to exit from said gap after having moved vertically upward therewithin.
Claim 4
Dependent Claim
16 words
The stud of claim 1 wherein said gap is of about 1/64 inch to 1/16 inch.
Claim 5
Dependent Claim
19 words
The stud of claim 1 wherein said outer layer has a plurality of holes therethrough spaced apart lengthwise therealong.
Claim 6
Dependent Claim
29 words
The stud of claim 4 wherein said pair of flanges are each about 3/4 inch wide, said holes are about 3/8 inch diameter and spaced apart about 1 foot.
Claim 7
Dependent Claim
16 words
The stud of claim 5 wherein said gap is of about 1/64 inch to 1/16 inch.
Claim 8
Dependent Claim
17 words
The stud of claim 6 wherein said metal stud is formed of steel of about 24 gauge.
Claim 9
Dependent Claim
73 words
A fire-resistant wall, comprising a plurality of vertically disposed studs as defined in claim 1, wherein said studs are mounted in fixed parallel relation with boards mounted therebetween forming a hollow wall, one set of said boards having edges affixed against the inner side of the flanges on said first side of said studs, and a second set of boards being affixed to the outer side of the second side of said studs.
Claim 10
Dependent Claim
46 words
A fire-resistant wall as defined in claim 8 wherein each said stud has a gap between said flange inner layer and said flange outer layer of from about 1/64 to 1/16 inch and said outer layer has a plurality of holes therethrough spaced apart lengthwise thereof.
Claim 11
Dependent Claim
62 words
A fire-resistant wall as defined in claim 9 wherein each said stud has a central web with outwardly bent tabs cut therefrom, said tabs holding said boards affixed against the inner side of the flanges on said first side of said stud, and the outward bending of said tabs leaving holes between the edges of said boards being held by said tabs.
References Cited (Backward Citations)
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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) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |