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Summary:A vacuum insulator includes first lateral beams, first longitudinal beams, second lateral beams and second longitudinal beams. The first longitudinal beams are arranged in parallel to one another at a predetermined interval. Each of the first lateral beams has a sectional area alternatively changed to be wide and narrow by the period that is ½ of the interval. The first longitudinal beams are intersected with the first lateral beams at a predetermined angle, and are arranged in parallel to one another at a predetermined interval. Each of the first longitudinal beams has a sectional area alternatively changed to be wide and narrow by the period that is ½ of the interval. Portions with the wide sectional area of each of the first longitudinal beams are attached on portions with the wide sectional area of each of the first lateral beam. The second lateral beams are intersected with the first longitudinal beams, and are arranged in parallel to one another at a predetermined interval at a predetermined angle and are alternately positioned. Each of the second lateral beams has a sectional area alternatively changed to be wide and narrow by the period that is ½ of the interval. Portions with the wide sectional area of each of the second lateral beams are attached on portions with the wide sectional area of each of the first longitudinal beams. The second longitudinal beams are intersected with the second lateral beams at a predetermined angle and are arranged in parallel to one another at a predetermined interval to be alternately positioned with the first longitudinal beams. Each of the second longitudinal beams has a sectional area alternatively changed to be wide and narrow by the period that is ½ of the interval. Portions with the wide sectional area of each of the second longitudinal beams are attached on portions with the wide sectional area of each of the second lateral beams.
Bibliography:Application Number: US20100708328