US3829057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete form
Assignee: Mansfield Tire and Rubber Co
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Filing: 1973-02-09
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Granted: 1974-08-13
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Expires: 1993-02-09
Abstract
Abstract A substantially rigid concrete form of compressed fibers is made in a substantially flat rectangular configuration. The form includes a central section and opposite side sections connected thereto by fold lines defined by rounded grooves. The side sections are foldable along the grooved fold lines relative to the central section to make a substantially U-shaped concrete form. The central section and side sections have longitudinallyspaced transverse stiffening ribs therein. At least certain of the central stiffening ribs and side stiffening ribs have end portions abutting one another when the form is folded to its substantially U-shaped configuration. This abutting relationship of the ribs supports the central section on the side sections.
Inventors
- 👤 L Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:38
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/34; B28B7/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
229 words
A concrete form comprised of a rectangular sheet of generally rigid fiberous material of generally uniform thickness and having a plurality of depressions in the upper surface forming stiffening ribs on the lower surface thereof, said sheet having a pair of spaced parallel extending grooves forming fold lines extending in spaced parallel relationship to the side edges of said sheet dividing said sheet into a central portion and a pair of side portions which can be folded on said fold line at an angle to said central portion said central portion having a plurality of said depressions extending generally transversely thereof with the ends in close spaced relationship to said fold lines; said side portions each having a plurality of said depressions aligned with said central portion depressions and extending from a point close to said fold lines toward the side edges of said sheet; said depressions eacH being defined by an end wall, side walls and a bottom, said end walls extending downwardly and outwardly away from the vertical plane through said fold line in an amount such that when said side portions are angled downwardly from the plane of said sheet by folding said sheet on said fold lines, the adjacent end walls of said depressions of said central and side portions will abut to limit the angle of folding to a predetermined angle less than 90*.
Claim 2
Dependent Claim
229 words
A concrete form comprised of a rectangular sheet of generally rigid fiberous material of generally uniform thickness and having a plurality of depressions in the upper surface forming stiffening ribs on the lower surface thereof, said sheet having a pair of spaced parallel extending grooves forming fold lines extending in spaced parallel relationship to the side edges of said sheet dividing said sheet into a central portion and a pair of side portions which can be folded on said fold line at an angle to said central portion said central portion having a plurality of said depressions extending generally transversely thereof with the ends in close spaced relationship to said fold lines; said side portions each having a plurality of said depressions aligned with said central portion depressions and extending from a point close to said fold lines toward the side edges of said sheet; said depressions eacH being defined by an end wall, side walls and a bottom, said end walls extending downwardly and outwardly away from the vertical plane through said fold line in an amount such that when said side portions are angled downwardly from the plane of said sheet by folding said sheet on said fold lines, the adjacent end walls of said depressions of said central and side portions will abut to limit the angle of folding to a predetermined angle less than 90*.
Claim 3
Dependent Claim
43 words
The form of claim 10 wherein the outer edges of said side portions are angled upwardly at an angle generally equal to said predetermined angle whereby when said side portions are folded downwardly through said predetermined angle said outer edges are generally coplanar.
Claim 4
Dependent Claim
38 words
The form of claim 2 wherein said central stiffening ribs extend in spaced-apart relationship perpendicular to said fold lines and alternating ones of said central stiffening ribs have larger cross-sectional configurations than others of said central stiffening ribs.
Claim 5
Dependent Claim
16 words
The form of claim 1 wherein said opposite side portions have upwardly extending outer flanges thereon.
Claim 6
Dependent Claim
21 words
The form of claim 1 wherein said central portion has a greater number of said stiffening ribs than said side portions.
Claim 7
Dependent Claim
17 words
The form of claim 1 wherein said stiffening ribs have a greater depth adjacent said grooved lines.
References Cited (Backward Citations)
US1056072A
Cited
US2101019A
Cited
US2160677A
Cited
US2681495A
Cited
US2963128A
Cited
US3111788A
Cited
US3488027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |