US4962622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Profiled sheet metal building unit and method for making the same
Assignee: ROBERTSON-CECO Corp A DE CORP
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Filing: 1989-06-01
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Granted: 1990-10-16
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Expires: 2009-06-01
Abstract
Abstract An improved cold formed, sheet metal profiled building unit and method of making the same are disclosed. The building unit incorporates at least one longitudinal stiffening rib in a longitudinal flat region of the type having a tendency to buckle when subjected to compressive forces. The longitudinal stiffening rib is formed not by drawing-in sheet metal as in current roll forming practices, but, instead, by stretching a segment of the sheet metal. Each longitudinal rib has a profile width, as measured along the centerline of the rib, which is greater than the linear of the sheet metal segment from which it was stretched-in. Roll forming machines incorporating the principles of this invention utilize fewer roll stands than do roll forming machines incorporating the principles of current roll forming practices.
Inventors
- 👤 Raymond E. Albrecht
- 👤 Charles R. Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:38
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/08; E04B; E04B5/00; E04B5/16; E04B5/32; E04B5/36; E04B5/38; E04B5/40; E04C2/30; E04C2/32; E04C2/322; E04C2/326
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
In a profiled building unit formed from sheet metal having a substantially uniform sheet thickness and presenting alternating crests and valleys, and sloped webs connecting adjacent ones of said crests and said valleys, the improvement comprising: first and second stiffening ribs formed, respectively, in said crests and said valleys, said stiffening ribs extending longitudinally along substantially the entire length of said building unit and each having a substantially uniform rib thickness that is less than said uniform sheet thickness of said metal sheet.
Claim 2
Dependent Claim
83 words
In a profiled building unit formed from sheet metal having a substantially uniform sheet thickness and presenting alternating crests and valleys, and sloped webs connecting adjacent ones of said crests and said valleys, the improvement comprising: first and second stiffening ribs formed, respectively, in said crests and said valleys, said stiffening ribs extending longitudinally along substantially the entire length of said building unit and each having a substantially uniform rib thickness that is less than said uniform sheet thickness of said metal sheet.
Claim 3
Dependent Claim
47 words
The building unit as defined in claim 1 including third stiffening ribs formed in said webs, extending longitudinally along substantially the entire length of said building unit and each having a substantially uniform rib thickness that is less than said uniform sheet thickness of said metal sheet.
Claim 4
Dependent Claim
31 words
The building unit as defined in claim 1 wherein only those of said valleys disposed between adjacent ones of said crests each include at least one of said second stiffening ribs.
Claim 5
Dependent Claim
52 words
The building unit as defined in claim 1 or 2 wherein the firth of said sheet metal is less than that required to produce a decking unit identical in profile to said building unit but with stiffening ribs having a rib thickness substantially equal to said uniform thickness of said sheet metal.
Claim 6
Dependent Claim
16 words
The building unit as defined in claim 1 or 2 wherein said stiffening ribs are stretched-in.
Claim 7
Dependent Claim
39 words
The building unit as defined in claim 1 or 2 wherein each of said stiffening ribs has a profile width that is greater than the linear width of the segment of said sheet metal from which each was stretched-in.
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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) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |