Stock material or miscellaneous articles – All metal or with adjacent metals – Nonplanar uniform thickness or nonlinear uniform diameter
Patent
1994-03-14
1996-03-26
Zimmerman, John
Stock material or miscellaneous articles
All metal or with adjacent metals
Nonplanar uniform thickness or nonlinear uniform diameter
428603, B21D 1310, E04C 232, B32B 328
Patent
active
055019129
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a material in the form of a strip, plate, foil, sheet, board or corresponding, provided with a corrugation or embossing which increases the stiffness of the material but at the same time makes it possible to bend the material to a high degree without exceeding it's yield point, i.e. without causing permanent deformation, which corrugation or embossing has the shape of ridges and valleys therebetween, the isohypsis of said ridges and valleys, within the region of a conceived strip shaped zone of the material, forming arcs when projected on an X-Y-plane in a three dimensional coordinate system, in which the X-direction coincides with the longitudinal direction of the corrugated zone, the Y-direction coincides with the breadth direction of the corrugated-zone, and the Z-direction is perpendicular to the X-Y-plane, while sections in the Y-Z-plane form a wave pattern consisting of waves alternating in the Z-direction.
BACKGROUND ART
Corrugation or embossing is a conventional means of increasing the stiffness and the resistance against bending of comparatively thin materials in at least one direction. The technique is used in a variety of applications. For example may be mentioned corrugated sheet iron. Corrugated board is another example, as according to DE-A1-2 211 925. Also in nature there are many shapes where folding patterns and the like give increased stiffness. It is in these examples often the question of comparatively thin materials, i.e. blades on flowers and grass, etc.
BRIEF DESCRIPTION OF THE INVENTION
It is an object of the invention to provide a new corrugation pattern which can be applied on the kinds of material mentioned in the preamble in order to increase the resistance to bending of the materials but at the same time make it possible to bend the material to a substantial degree without increasing the yield point of the material, i.e. without causing permanent deformation.
These and other objectives can be achieved therein that the height of the arcs projected on the X-Y-plane, arc height being defined as the extension of the arcs in the Y-direction within said zone, is at least as large as or larger then the wave length of said waves alternating in the Z-direction.
The corrugation or the embossing within the region of the conceived, strip shaped zone of the material thus consists of ridges and valleys alternatingly, said ridges and valleys extending in the shape of arcs over the breadth of the zone. These arcs preferably consist of parabolas but they can also have other shapes, e.g. be circular arcs, hyperbolas, or other preferably symmetrical curves.
Disregarding the method of defining the corrugation pattern, the distance in the longitudinal direction of the strip shaped zone, for each of said ridges, between on one hand the points of intersection between the crest line curve and the zone edges, and on the other hand the point of intersection between the crest line curve and a plane in the longitudinal direction of the zone, perpendicular to the zero plane or basic plane of the material and the tip point of the intersecting arc, is at least as large as or larger than the distance between said tip point and the tip point on an adjacent ridge.
The material can exhibit a single zone of the above mentioned type or several such zones, which are arranged parallel to each other, and each of which exhibits the said arc shaped corrugation pattern, and these arcs may be arranged in the same or in opposite directions, as is indicated in the appending claims. Preferably the ridges and valleys flat out in those edges of the material which are parallel with the longitudinal direction of the zone or the zones.
Preferably the above described corrugation is superimposed on a basic shape of the material, in which the basic shape is arcuated in a plane perpendicular to the longitudinal direction of said zone or zones. More particularly the basic shape of the material in said plane preferably forms an arc within each corrugated zone, i.e. the material is arcuat
REFERENCES:
patent: 235449 (1880-12-01), Newton
patent: 1240231 (1917-09-01), Lumley
patent: 1704326 (1929-03-01), Junkers
patent: 1868302 (1932-07-01), Auger
patent: 1993172 (1935-03-01), Kent
patent: 2233592 (1941-03-01), Dunajeff
patent: 2896692 (1959-07-01), Villoresi
patent: 3165815 (1965-01-01), Wogerbauer
patent: 3254968 (1966-06-01), Bender
patent: 4518544 (1985-05-01), Carter et al.
patent: 5314738 (1994-05-01), Ichikawa
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