A system for drilling and, simultaneously, reinforcing the contour of the perforation in aluminum plate material in archivers (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the object of the Main Patent No. 268,421 by "A system for drilling and, simultaneously, reinforce the contour of the perforation, in sheet material accommodatable in filing cabinets" applicable to similar devices that hold the sheets by means of through elements through perforations in the margin, characterized in that to avoid in the phase of the perforation and successive reintegration of the punch to its initial position, claimed in said Main Patent and in its first Addition Certificate No. 277.450, that the impregnation of the punch with the glue of the adhesive tape, makes difficult the control, and also to avoid that the circular piece sheared from the treated material and from the tape, remains adhered to the head of the punch, is provided to the lower face of the platform of the apparatus claimed therein, of a layer laminate of a material capable of imbibing a liquid that prevents such adherence of glue to the punch, whose layer carries acticated, in coincidence with the circular steps of the platform, similar holes of diameter slightly inferior to that of the punch. (Machine-translation by Google Translate, not legally binding)