Patent US4027846A successfully refreshed from Google Patents.
US4027846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel for casting concrete
Assignee: Coffrages Madernes Les SA
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Filing: 1975-12-31
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Granted: 1977-06-07
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Expires: 1995-12-31
Abstract
Abstract A panel for casting concrete comprising a front casting plate having a flat front surface constituting a support surface for cast concrete and a rear plate spaced from the front plate. A layer of expanded plastic foam material such as polyurethane foam of high density is cast, in situ, between the plates and effects joinder of the plates with the foam layer to form an assembled panel which behaves as a beam and has high resistance to bending and shear stresses.
Inventors
- 👤 Sylvain Caplat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:39
CPC Classifications
E; E04; E04G; E04G9/00; E04G9/02; E04G9/06; E04G11/00; E04G11/06; E04G11/08; E04G11/12; E04G17/00; E04G17/002; E04G9/10; E04G2011/067
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
197 words
A panel for casting concrete comprising a front casting wall of steel sheet, a rear wall of steel sheet, said front casting wall facing said rear wall and being spaced therefrom, and a layer of expanded rigid polyurethane foam of high density cast in situ between said walls and joining said walls together, the mechanical properties of the cast foam being such that the panel behaves under the load of the concrete as a beam, said mechanical properties being such that: the polyurethane layer has a sufficient rigidity to prevent relative displacement of said two walls and to resist the shear-tensile forces and as a consequence has a density of at least 200kg/m 3 ; said front casting wall has a thickness of at least 2.5mm for resisting the tensile forces applied thereto by bending of the panel, said rear wall has a thickness of at least 2.5mm for resisting the compression forces applied thereto by bending of the panel, the adherence of the polyurethane layer with the walls being sufficient to resist the shear-tensile forces and being obtained solely due to the properties of adherence of the polyurethane after polymerization in situ between the two walls.
Claim 2
Dependent Claim
197 words
A panel for casting concrete comprising a front casting wall of steel sheet, a rear wall of steel sheet, said front casting wall facing said rear wall and being spaced therefrom, and a layer of expanded rigid polyurethane foam of high density cast in situ between said walls and joining said walls together, the mechanical properties of the cast foam being such that the panel behaves under the load of the concrete as a beam, said mechanical properties being such that: the polyurethane layer has a sufficient rigidity to prevent relative displacement of said two walls and to resist the shear-tensile forces and as a consequence has a density of at least 200kg/m 3 ; said front casting wall has a thickness of at least 2.5mm for resisting the tensile forces applied thereto by bending of the panel, said rear wall has a thickness of at least 2.5mm for resisting the compression forces applied thereto by bending of the panel, the adherence of the polyurethane layer with the walls being sufficient to resist the shear-tensile forces and being obtained solely due to the properties of adherence of the polyurethane after polymerization in situ between the two walls.
Claim 3
Dependent Claim
58 words
A panel as claimed in claim 1 adapted for being supported on a framework including vertical posts at spaced intervals, said casting wall being non-planar and having an initial shape to compensate for deflection of the panel and of the framework under the pressure of the concrete in order to obtain a planar cast face on the concrete.
Claim 4
Dependent Claim
57 words
A panel as claimed in claim 2 wherein said rear wall is planar, said shape of the front wall including a camber extending from top to bottom and widthwise from one post to the next, the camber having a summit situated midway between the posts and at a height equal to one third that of the panel.
Claim 5
Dependent Claim
21 words
A panel as claimed in claim 1 wherein said rear wall includes a plurality of horizontal parallel folds at spaced intervals.
Claim 6
Dependent Claim
63 words
A panel as claimed in claim 4 wherein said front wall has a face which is initially non-planar to compensate for deformation of the panel under the force of the cast concrete, said front wall comprising a series of vertical undulations having maximum amplitude situated midway between two successive folds of the rear wall and whose minimum amplitude is situated at said folds.
Claim 7
Dependent Claim
52 words
A panel as claimed in claim 4 in combination with a support frame, said folds on the rear wall being tapered in a direction away from the front wall and having rear bearing surfaces, said support frame for the panel including means for contacting said rear bearing surfaces of the rear wall.
Claim 8
Dependent Claim
19 words
The combination as claimed in claim 6 further comprising means for vertically adjusting the frame and the panel therewith.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |