SI9012413B - Procedure for producing of cartridge cases for fire arms and the thus obtained case - Google Patents

Claims (14)

-1- CLAIMS: 1. A process for the production of cartridge cases for firearms of the type consisting of three elements, i. from a cylindrical tube (2), a reinforcement part (3) which is inserted into one end of the tube (2), and a base (4) which is intended to receive at least the end (21) of the tube (2) in which the there is a reinforcement part (3) formed in such a way that it has an edge or a circular tooth (anchoring tooth) (31) at one of its ends, which protrudes laterally from this reinforcement part (3); said circular tooth (31) having a maximum outer diameter not less than the outer diameter of the tube (2) and inclined towards the circular cylindrical surface of the reinforcement part (3); characterized in that the reinforcement part (3) is made of a material which does not deform significantly; that the base (4) is made with an open bottom and two coaxially following sections (41,42) of different inner diameters (41 d, 42d), the smaller of the two inner diameters (41 d) being essentially the same as the outer diameter tubes (2), the larger inner diameter (42d) being substantially equal to the outer diameter of the circular tooth (31) of the reinforcement part (3); and wherein the connecting part (oblique passage) (43) between the two sections (41,42) with different inner diameters of the base (4) is inclined in the same way as the circular tooth (31) of said reinforcement part (3) so as to form an oblique passage (43) forming a bearing inside the base (4) for receiving said circular tooth (31) of the reinforcement part and the end (21) of the pipe (2); and characterized in that the following phases are provided: inserting the pipe (2) into the base (4) so that one of the ends (21) of the pipe (2) extends through the connecting line (44) connecting the smaller diameter part (41) and the oblique a passage (43) of the base (4) with an end (21) for a length (1) not less than the axial extension of said oblique passage (43); inserting the reinforcement part (3) into the larger diameter section (42) of the base (4) and into the pipe (2) by pressing the circular anchor tooth (31) of the reinforcement part (3) against the corresponding free end (21) of the pipe (2) and pressing it against the oblique passage (43) of the base (4) without deforming said circular anchor tooth (31) so that this end (21) of the tube (2) is seamlessly screwed against the surface of the bearing defined by said oblique transition (43); bending by pressing, rolling or otherwise working a larger diameter base (4) until it rests on the reinforcement part (3) located inside it. -2- Method according to claim 1, characterized in that the outer diameter (3d) of the circular tooth (31) of the reinforcement part (3) is substantially equal to the larger inner diameter (42d) of said base (4) reduced by twice the thickness of said tube. (2). Method according to claim 1, characterized in that said pipe (2) extends over the connecting line (44) of the joint between the smaller diameter part (41) and the oblique passage (43) of the base (4) with its lower part (21) for a length (1) not less than the axial length of the extension of said oblique passage (43), measured in parallel with one of its glands. Method according to claim 1, characterized in that said pipe (2) extends over the connecting line (44) of the joint between the section of smaller diameter (41) and the oblique passage (43) of the base (4) with its lower part (21) for a length (1) not less than the axial length of said oblique passage (43), measured parallel to one of its glands, but only to such an extent that with the reinforcement part fully inserted into the base (4) and into the tube (2) 3) it does not protrude from said reinforcement part (3). Method according to claim 1, characterized in that said pipe (2) extends over its line (44) of the joint between the smaller diameter part (41) and the oblique passage (43) of the base (4) with its lower part (21) of the pipe. 2) a length (1) not less than the axial length of said oblique passage (43), measured parallel to one of its glands, but so that when the reinforcement part (3) is fully inserted into the base (4) and in the tube (2) protrudes from said reinforcement part (3) and is clamped between the surface of the respective bottom of the base (4) and the edge of the base (4) and bent over the latter. A sleeve of a type consisting of three elements consisting of a tube (2), a reinforcement part (3) inserted into the tube (2) and a base (4) surrounding the tube (2) at its end, which are designed so that, independently of the assembly phase of the sleeve, at its end a circular (and continuous) anchoring tooth (31) intended to be mounted in said bearing together with the end (21) of the tube (2) ) defined by the oblique passage (43) of the base (4), wherein the circular tooth (31) of the reinforcement part (3) presses the corresponding end (21) of the tube (2) against the inner wall of said oblique passage (43), forming said bearing (45) obtained by the method described in the preceding claims, characterized in that said reinforcement part (3) is made of a material which is practically deformable and that said base (4) has the shape a cylindrical tube which is open on both sides and has different diameters at both ends, so that an oblique passage (43) is formed; wherein the outer edge of the section (42) with the larger diameter of the base (4) is bent towards the axis of the base, so that said bearing (45) is defined by -3 * C: r. it forms an oblique passage (43) closed, whereby the circular tooth (31) of the reinforcement part (3) in it is closed. A sleeve according to claim 6, having an axial hole (32) in the reinforcement part (3), characterized in that it has reinforcement parts (3) at the end of said axial hole (32), on the side which is determined to come into contact with the gunpowder (6), several protrusions (33) which serve to prevent the gunpowder located in the pipe (2) from extinguishing the flame of the initial cap (5). Sleeve according to claim 7, characterized in that the protrusions (33) facing from said reinforcement part (3) towards the area of the axial bore (32) on the side defined for contact with the gunpowder consist from an equal number of lamellae arranged along the radial direction of the reinforcement part (3). According to claim 1, characterized in that the axial bore (32) of said reinforcement part (3) has a shape corresponding to the shape of the initial cap (5) arranged inside it. According to claim 9, characterized in that said reinforcement part (3) has within its axial bore (32) an element (34) coaxial with the bore and represent anvils for the initial cap (5) install inside the same axial bore (32) which is not completely filled with said anvil. Sleeve according to Claim 6, characterized in that said reinforcement part (3) is designed to have, regardless of the assembly stage of the sleeve, a shape which provides better ballistic efficiency and greater safety. Sleeve according to Claim 6, characterized in that said reinforcement part (3) is designed to have a shape independent of the sleeve assembly phase, which makes it suitable for axially lowering (weakening) the soot on its inner part. in said pipe (2) under the action of gunpowder pressure (6) during combustion. Sleeve according to claim 12, characterized in that said reinforcement part (3) has a circular groove (35) separated from the gunpowder by a barrier (37) whose thickness is small enough to be bent. under the pressure of gunpowder (6) during combustion. Sleeve according to claim 6, characterized in that said reinforcement part (3) has at least one recess or weakening on the side provided for not coming into contact with the gunpowder (36).