초록 ▼

A method of forming a frangible metal bullet core comprising providing an elongated inner heart member made up initially of a bundle of parallel zinc wires, twisting a plurality of zinc wires tightly around that bundle in a spiral path to cause the wires to inter-engage, deform and cohere to each ot

A method of forming a frangible metal bullet core comprising providing an elongated inner heart member made up initially of a bundle of parallel zinc wires, twisting a plurality of zinc wires tightly around that bundle in a spiral path to cause the wires to inter-engage, deform and cohere to each other, and thereafter swaging the inter-engaged wires into the shape of a bullet core to cause the core, upon striking a target, to disintegrate into fragments smaller than the individual wires. Although copper, iron, and steel wires may be used, zinc made up of 99.99% pure zinc has been found to be preferable for forming such a core.

대표청구항 ▼

[ We claim:] [1.] A method of forming a frangible metal bullet core comprising:(a) providing an elongated inner heart member made of strands of zinc which will self-anneal subsequent to being work hardened and having opposite ends;(b) providing a plurality of separate strands made of zinc which will

[ We claim:] [1.] A method of forming a frangible metal bullet core comprising:(a) providing an elongated inner heart member made of strands of zinc which will self-anneal subsequent to being work hardened and having opposite ends;(b) providing a plurality of separate strands made of zinc which will also self-anneal subsequent to being work hardened;(c) twisting the separate strands tightly around the inner heart member along a spiral path in inter-engaging, deforming and encircling relation therewith prior to being swaged, and(d) swaging the inter-engaged inner heart member and the encircling strands into the shape of a bullet core with sufficient pressure to retain the individuality of the encircling strands at least to a limited extent, whereupon the core, upon striking a target, will disintegrate into fragments smaller than the original size of the encircling strands.