Primer housing for firearms and other munitions
A primer structure is provided for holding a deposited ignitable material, and for holding the ignitable material within a firearm cartridge or within another munition. The primer includes a disk and a retaining ring. Ignitable material is deposited on a surface of the disk. The retaining ring is positioned in front of the disk. The retaining ring includes angled passageways for reaction products to travel from the ignitable material to the propellant. The forwardmost surface of the retaining ring, as well as the angle of the passageways, dissipate pressure that would otherwise be borne by the disk. Both the disk and retaining ring include angled or stepped surfaces to resist movement under pressure.
1. A firearm cartridge, comprising:
a casing having a sidewall, a front end, and a back end, the back end defining a primer pocket therein, the primer pocket having a side surface;
a primer, comprising:
a disk having a first surface, a second surface, and an edge defined between the first surface and second surface, the edge having a pressure-resisting configuration, the second surface of the disk having an ignitable material thereon;
a retention piece having an open end, a closed end, and a side wall extending therebetween, the open end being dimensioned and configured to substantially match the second face of the disk, the closed end having a larger cross sectional area than the open end, a portion of the side wall having a pressure-resisting configuration, the retention piece defining a recess within the open end, the retention piece further defining a central axis extending between the open end and the closed end, the retention piece defining a plurality of channels extending from the recess to the closed end, the channels being angled from parallel to the central axis; and
the side surface of the primer pocket having a shape that substantially matches the pressure-resisting configuration of the disk and the pressure-resisting configuration of the retention piece;
whereby movement of the retention ring and disk caused by pressure inside the casing is resisted by interaction of the side surface of the primer pocket with the pressure-resisting configurations of the disk and retention piece.
2. The cartridge according to claim 1 , wherein the second surface of the disk defines a recess therein, the ignitable material being located within the recess.
3. The cartridge according to claim 1 , wherein the plurality of channels are distributed substantially uniformly around the retention piece.