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Priority to ES0269208ApriorityCriticalpatent/ES269208A3/en
Publication of ES269208A3publicationCriticalpatent/ES269208A3/en
Improvements in the manufacture of reinforcing boxes, which are characterized by the fact that part of a thin sheet of cardboard or similar, even plastic, which takes a variable form but always providing that its lateral edges, whatever their number , be cut arch; bent or superimposed on itself the base surface, it proceeds to a glued or stitched edge opposite the fold, so as to result a continuous surface whose two superimposed parts can be separated by its central part, determining the space or capacity of the box, which is maintained and, at the same time closed, by the pressure that the bulging of the superimposed surfaces exerts on the sides, in which folding wings have been foreseen for the purpose whose tracing for the fold follows a curved line of the same radius but opposite direction to the edge of the surface, so that said pressure keeps these wings in the closed position. (Machine-translation by Google Translate, not legally binding)
ES0269208A1961-07-171961-07-17Improvements in the manufacture of armables boxes (Machine-translation by Google Translate, not legally binding)
ExpiredES269208A3
(en)