Stock material or miscellaneous articles – All metal or with adjacent metals – Honeycomb – or with grain orientation or elongated elements...
Reexamination Certificate
1996-10-11
2001-08-28
Thibodeau, Paul (Department: 1773)
Stock material or miscellaneous articles
All metal or with adjacent metals
Honeycomb, or with grain orientation or elongated elements...
C428S595000, C428S604000, C428S650000, C428S654000, C428S181000, C428S182000, C428S183000, C428S184000, C428S185000, C428S926000, C072S177000, C072S187000, C072S196000, C052S058000
Reexamination Certificate
active
06280856
ABSTRACT:
The invention relates to a deformable root flashing material for use in connection with roof windows and similar roof penetrating building structures consisting at least partly of a metal sheet or a metal foil in the form of a ribbon or a strip, one long side of which is intended for connection with the roof penetrating building structure, said ribbon or strip being corrugated in a continuous waveform.
Such deformable sheet materials are frequently used to provide water- and snowproof adaptations between roof penetrating building structures, especially roof windows, and the surrounding roofing which may consist of tiles or other forms of corrugated covering materials.
In order to permit an adaptation of such flashing materials to the form of the surrounding roof covering by a purely manual deformation, the use of corrugated roofing materials of above-mentioned type made from lead or other forms of deformable metal foil as disclosed in, inter alia, DE utility model G 82 00 019.0, has in course of time also been proposed to replace the flat lead skirts with a thickness of 1-2 mm and originally used for this purpose
Concurrently with increasing concern of the environment, it has further been suggested to use a number of different sandwich or composite materials including those disclosed in the applicant's DK patents nos. 148.064 and 165.014 and EP patents nos. 0 038 222 and 0 123 141, in order to avoid the pollution problems related to the use of lead.
However, such sandwich materials have as a rule been considerably more expensive than pure lead flashings. Furthermore, both per se and as a consequence of their incorporation in a sandwich material together with partly elastomeric materials, the used metal foils have not always had the required lasting deformation properties because of a certain remaining elastic resilience.
Based on corrugated flashing materials of the type disclosed in above DE utility model, it is the object of the invention to procure a new design of a flashing material which can be produced at a low price and has deformation properties fully up to the standard of those of the best sandwich materials.
To this end, a flashing material of the above type according to the invention is characterized in that said ribbon or strip is corrugated in a continuous waveform in two directions substantially orthogonal to each other.
The double waveform of the flashing material according to the invention entails that the area of the metal sheet or foil per unit area of the finished flashing material is substantially increased, which is decisive for an easy manual deformability by the stretching of the crests and valleys of the waveform without necessarily stretching or butting the very foil material.
As an appropriate foil material according to the invention, an aluminium foil having a thickness preferably between 0.05 and 0.4 mm may be used. However, other forms of metal foils with good plastic deformation properties, eg. copper or zinc, may also be used.
Moreover, according to the invention, it appeared that particularly good lasting deformation properties practically without resilience and at the same time an improved strength arid rigidity can be obtained by using two folded, up metal foil layers with a relatively small thickness.
A preferred embodiment is therefore according to the invention characterized in that prior to the corrugation in said waveform, the ribbon or strip is folded in the longitudinal direction along a folding line placed substantially halfway between the two opposite long sides.
In sheet materials for roofing where, unlike easily deformable flashing materials of the type to which this invention relates, importance has to be attached to high strength and stiffness in combination with a low net weight and a certain ability to absorb limited movements as a result of thermal expansion, it is in itself known from SE published specification No. 376454, DE-OS No. 1809878 and FR patent No. 959824 to provide the sheet material with a double corrugation in directions which are orthogonal to each other.
On the basis of this prior art the invention furthermore relates to a method of manufacturing a sheet material as indicated above, in which a ribbon or a strip consisting at least partly of metal sheet or metal foil is corrugated by rolling in a first direction for production of a first continuous waveform. According to the invention, said method is characterized in that after rolling in said first direction said ribbon or strip is corrugated in a second waveform substantially orthogonal to the first by rolling in a second direction substantially orthogonal to said first direction.
REFERENCES:
patent: 1450351 (1923-04-01), Beran
patent: 3034212 (1962-05-01), Reifers
patent: 3395438 (1968-08-01), Seeff
patent: 4380573 (1983-04-01), Naslund
patent: 4594818 (1986-06-01), Prestidge
patent: 5946862 (1999-09-01), Hoffman
patent: 1809818 (1969-08-01), None
patent: 0038222 (1981-10-01), None
patent: 959824 (1949-10-01), None
patent: 1243338 (1971-08-01), None
patent: 376454 (1973-04-01), None
Andersen Susanne Bjergegaard
Jacobsen Per
Anderson Chad
Rickman Holly C.
Shannon John P.
Thibodeau Paul
V. Kann Rasmussen Industri A/S
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