Bullet with reverse taper interlock jacket and method of manufac

Details Bullet with reverse taper interlock jacket and method of manufac Bullet with reverse taper interlock jacket and method of manufac

1988-02-16

1989-08-15

Eley, Timothy V.

Metal working

Bias cutting of tubular stock

29 122, B21K 2106

Patent

active

048561606

ABSTRACT:
A reverse taper jacketed bullet has a tubular jacket in the form of a continuous wall defining a cavity and a one-piece core disposed in the jacket cavity. The jacket has opposite heel and mouth portions and an intermediate portion interconnecting the heel and mouth portions. The jacket wall is thicker at the intermediate portion than at either the heel or mouth portion thereof so as to define a reverse taper configuration along the intermediate and heel portions which bulges inwardly at the intermediate portion interior relative to the heel portion interior. The reverse taper configuration provides an inside diameter at the jacket intermediate portion that is less than at the jacket heel portion and in such manner produces a constriction that interlocks the lead core and jacket together. The reverse taper configuration of the jacket wall is formed in final draw step by insertion of a punch having an hour glass shaped or reverse taper configured end portion into an elongated predrawn cup. The final drawing produces a thicker wall at the location of the intermediate portion of the jacket than at the location of the heel or mouth portion thereof. Withdrawal of the punch from the jacket causes the thicker intermediate wall portion to bulge outwardly at the exterior of the jacket. Then, the jacket wall is drawn in to provide a generally uniform outside diameter that causes the thicker intermediate wall portion to bulge inwardly at the interior of the jacket.

REFERENCES:
patent: 2321344 (1943-06-01), Whipple
patent: 2765738 (1956-10-01), Frech, Jr.
patent: 3349711 (1967-10-01), Darigo et al.

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