Process for forming projectiles for smooth bore shooting guns

• US 4,419,318 A
• Filed: 10/20/1980
• Issued: 12/06/1983
• Est. Priority Date: 10/26/1979
• Status: Expired due to Term

• Current Assignee: SNIA Viscosa Societa` Societa` Nazionale Industria Applicazioni Viscosa SPA Italy
• Original Assignee: SNIA Viscosa Societa Nazionale Industria Applicazioni Viscosa SPA
• Inventors: Turco, Vincenzo, Pompili, Antonio
• Primary Examiner(s): Hoag, Willard E.
• Application Number:
  US06/199,039
• Time in Patent Office: 1,142 Days
• Field of Search: 264/271.1, 264/267, 264/275, 264/279, 264/261-263
• US Class Current: 264/274
• CPC Class Codes: F42B 7/10 Ball or slug shotgun cartridges

Abstract

Method for forming a projectile for a smooth bore gun from a metal bullet,ubstantially made of lead, and a wad-flight control element of plastic material. The bullet is constituted by a metal body provided with an ogive with centering fins and comprises one or more cylindrical segments. The wad-flight control element comprises a container, connected to the bullet and containing the same, an amortizing portion and a cup for sealing off propellant gases. The amortizing portion and the sealing cup act to control the projectile during its flight. The bullet is positioned in a mold by the ogive and the plastic is injection molded about the bullet and inserts to define the flight control element.

Claims

1. A process for forming a projectile for use in a smooth bore gun and of the type including a combined metal bullet and a wad-flight control element formed of a plastic material, said process comprising:

forming a metal bullet having a front end of ogival configuration, a rear end, and at least one cylindrical intermediate section having extending therefrom fins;

positioning said bullet in a die and centering said bullet therein by contacting the ogive of said front end and said fins with respective first and second inner surfaces of said die, while maintaining a generally annular space around said cylindrical section, between said cylindrical section and said second inner surface of said die;

positioning adjacent said rear end of said bullet within said die a plurality of die inserts of a configuration to define therebetween a reticulated space in communication with said annular space and a cup-shaped space in communication with said reticulated space and facing away therefrom; and

injecting plastic material into and filling said cup-shaped space, said reticulated space and said annular space, thereby fixedly forming on said metal bullet a plastic wad-flight control element including a container portion fixed to and surrounding said bullet and formed from plastic injected into said annular space, a reticulated portion integral with and extending rearwardly from said container portion and formed from plastic injected into said reticulated space, and a sealing cup portion integral with and extending rearwardly from said reticulated portion and formed from plastic injected into said cup-shaped space.

2. A process as claimed in claim 1, wherein said injecting comprises pressure injection.

3. A process as claimed in claim 1, comprising forming said annular space both forwardly and rearwardly of said fins, whereby said plastic forming said container portion grips said fins on opposite axial ends thereof.

4. A process as claimed in claim 1, wherein said bullet is formed of lead and said plastic material comprises polyethylene.