Device for laterally perforating metallic pieces, particularly pressed pieces

A device for perforating a hollow cylindrically metallic piece of elongated shape and with straight generatrix, in at least one pattern which extends over a considerable part of the length of said generatrix and which is constituted by a large number of adjacent perforations, comprising:

• a vertical press composed of a stationary press bench and a vertically movable part;
• a plurality of uprights which extend at least over a considerable part of the length of the generatrix of the elongated piece, and which are mounted to slide horizontally on the press bench, along axes converging towards the central axis of the press;
• means for converting the vertical descent of the movable part of the press from an uppermost position to a lowermost position into a simultaneous horizontal displacement of the uprights towards the central axis of the press to a forward position and to ensure the return of the uprights to a backward initial position during the rise of the movable part, these means cooperating with the uprights at least in an axially median zone thereof, each said upright having a shoulder defining a recess therein, said recess having parallel slanted portions, said press bench having recesses therein and the means for converting the vertical descent of the movable part of the press into simultaneous horizontal displacement of the uprights comprising a plurality of arms, rigidly suspended from the movable part of the press, each said arm having parallel slanted sections which cooperate in vertical movement with said parallel slanted portions of said recess in said shoulder of the upright lying in the axially median zone thereof, said parallel slanted sections of the arm being extended by a vertical part which cooperates with a recess of said press bench and corresponding in dimensions, so that said arm is maintained rigidly during punching and immobilizes the upright in the forward position when said movable part is in the lowermost position and immobilizes the upright in the backward position when said movable part is in the uppermost position;
• a hollow cylindrical stake positioned on the press bench extending coaxially with the central axis of the press, said stake having openings therein;
• and
• a plurality of horizontal punches which are borne by the front face of each upright facing the center of the press and which are disposed substantially one below the other in adjacent manner over the whole height of the pattern to be made, these punches being adapted to penetrate corresponding openings in said stake, said stake having a diameter corresponding to the inner diameter of the cylindrical piece to be perforated and supporting said piece.