Cartridges for firearms, construction process and related construction equipment
View Patent ↗The present invention concerns a cartridge for firearms comprising a cartridge case with a crown of wings. The wings themselves are fused or glued to one another so as to form an ogival closing element of the cartridge case. The invention also concerns the process for manufacturing the cartridge and the relative equipment.
1. Process for manufacturing a cartridge ( 101 ), comprising the following steps:
providing a cartridge case ( 125 ) made from a polymer material with an inner chamber ( 140 ) defined by at least one at least partially yieldable wall ( 126 ), said cartridge case developing around a central longitudinal axis (X) and has two ends ( 105 , 132 ) in the longitudinal direction, one of which has an access opening ( 142 ) for accessing the inner chamber ( 140 ), said cartridge case ( 125 ), inside the inner chamber, containing at least one primer ( 105 ), an propellant charge ( 110 ), a wad ( 115 ) and a plurality of at least one of pellets or shots ( 120 ),
making a crown of wings ( 150 ) that develops around the central longitudinal axis (X) at said opening by folding an edge ( 144 ) of the cartridge case;
forcing the wings ( 150 ) into a first folded configuration partially closing the opening ( 142 );
at least partially fusing the polymer material forming the cartridge case substantially for an entire height (H) of the wings ( 150 ) in a direction of the central longitudinal axis (X) at least at a front surface of an edge ( 154 ) of the wings; said fusing taking place in said first folded configuration;
forcing the wings ( 150 ) into a second folded configuration completely closing the opening ( 142 ) when the fused polymer material is still liquid; and
forcing the wings ( 150 ) to remain in the second folded configuration until the fused material is solidified.
2. The process according to claim 1 , wherein a welder head ( 160 ) inserts in the partially closed opening ( 142 ) at the central longitudinal axis (X) to carry out said fusing of the polymer material, the welder head ( 160 ) being pin-shaped with a height (H 2 ) at least equal to the height (H) of the wings ( 150 ).
3. The process according to claim 1 , wherein in the second folded configuration the wings are disposed to form an ogival closure for said aperture.