Improvements in the manufacturing of writers useful. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in the manufacture of writing tools, of the type comprising a non-metallic writing tip fed by capillarity from a porous body retainer of the ink, essentially characterized by the fact to obtain on the outer wall of the protective cartridge of the porous felt support of the ink, a continuous helical step; in obtaining the cross section of the cartridge and felt assembly, substantially equal to the internal cross section of the handle of the tool, in order that both said elements are adjusted to each other by fitting, and this adjustment can contribute to the gluing of the contact surfaces of both bodies, by means of adhesive previously applied on the outer surface of the cartridge; in arranging the whole of the cartridge with its corresponding felt, in a suitable position inside the handle in order to achieve two extreme pressure compensating chambers, of unalterable volume; in closing one of the ends of the handle of the tool by means of a suitable cap, while in the opposite one there is a piece that includes the non-metallic tracer point in a position coaxial with the ink charge, the inner end of said tip being in contact with the the porous front of the load, and the opposite end protruding tightly through the piece in which it is threaded, whose part has the air inlet hole that establishes the pressure balance between the aforementioned extreme chambers, through the helical pitch of the cartridge, leaving this piece carrying the tip, possibly covered by a snap-on closing cap. (Machine-translation by Google Translate, not legally binding)