Horizontally supported planar surfaces – Plural related horizontal surfaces
Patent
1977-01-21
1978-03-28
Zugel, Francis K.
Horizontally supported planar surfaces
Plural related horizontal surfaces
211 73, 248174, A47B 5500
Patent
active
040809072
ABSTRACT:
A new shelf and a method for its fabrication from a single generally rectangular sheet of thermally deformable material. First and second spaced apart axes are selected which extend across the width of the sheet. Third and fourth spaced apart axes are selected which extend longitudinally of the sheet perpendicular to the first and second axes. The third and fourth axes are spaced from the side edges to define opposing sidewall portions. A u-shaped cut, both ends of which terminate within the margins of the sheet, is made in the medial portion of the sheet along segments of the axes. The cut defines a frontal edge, opposing shelf ends having tabs, and opposing shelf end receiving slots in the sidewall portions. The sheet is heated along specified axes and simultaneously the shelf and the sidewall portions are orthogonally bent outward from the sheet, and the tabs are inserted in the shelf end receiving slots. The shelf and its rear wall form an L-beam. The tab-to-slot joints and the L-beam configuration of the shelf provide the shelf with a bending resistancy when loaded. A single sheet can be formed into a conventional shelf case having a plurality of shelves, by making a plurality of such U-shaped cuts at preselected intervals along a sheet of material.
REFERENCES:
patent: 335136 (1886-02-01), Leonard et al.
patent: 1124175 (1915-01-01), Sackett
patent: 1916647 (1933-07-01), Walker
patent: 2155190 (1939-04-01), Heinz
patent: 2439690 (1948-04-01), Lippenberger
patent: 2900667 (1959-08-01), Longenecker
patent: 2918178 (1959-12-01), Leone
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