Projectile rotating band

• US 5,909,003 A
• Filed: 10/06/1997
• Issued: 06/01/1999
• Est. Priority Date: 01/13/1997
• Status: Expired due to Fees

• Current Assignee: Oerlikon Contraves Pyrotec AG
• Original Assignee: Oerlikon Contraves Pyrotec AG
• Inventors: Burri, Jakob
• Primary Examiner(s): TUDOR, HAROLD JAY
• Application Number:
  US08/944,838
• Time in Patent Office: 603 Days
• Field of Search: 102/501, 102/514-527, 102/528, 102/529, 86/1.1, 29/1.2-1.23
• US Class Current: 102/518
• CPC Class Codes: F42B 14/02 Driving bands; Rotating bands F42B14/04 takes precedence

Abstract

A projectile rotating band (7) is firmly connected, through openings (9) in the projectile casing (2), to a sealing section (10) at the rear of the projectile inside the projectile casing (2). The rotating band (7) is formed together with the sealing section (10) in the course of a single step of the manufacturing process by injecting a synthetic material into the projectile casing (2) through its open back. The band (7) is prevented from twisting off during firing by the unitary construction, and will not abrade the barrel since it is non-metallic.

Claims

1. A projectile comprising:

a projectile casing (2) comprising a circumferential recess (8) including a plurality of openings (9) between the recess and an inside of the casing;

a projectile nose (3) comprising a fiber-reinforced, thermoplastic synthetic material extending from a front end of the casing;

a projectile core (5) disposed within the casing and the nose; and

a distinct sealing section (10), comprising the same fiber-reinforced thermoplastic synthetic material, disposed at a rear of the projectile inside the projectile casing (2) around a rear portion of the projectile core (5); and

a rotating band (7) being unitary with the sealing section (10) and being firmly connected to the sealing section (10) via the openings (9).

2. The projectile according to claim 1, wherein the rotating band (7) and the sealing portion (19) are formed together during a single manufacturing step by injecting the synthetic material into the projectile casing (2) through an open back at a rear end thereof.

3. The projectile according to claim 1, comprising a center centering finger (6) between the casing and the core.

4. The projectile according to claim 1, wherein the casing comprises circumferential grooves (4, 11, 12) on an inner surface thereof and the sealing section and the nose are anchored to the grooves.

5. A method of making a projectile, the method comprising:

providing a projectile casing (2) comprising a circumferential recess (8) including a plurality of openings (9) between the recess and an inside of the casing;

forming, from a fiber-reinforced, thermoplastic synthetic material, a projectile nose (3) extending from a front end of the casing;

placing a projectile core (5) within the casing and the formed nose; and

forming, from the same fiber-reinforced, thermoplastic synthetic material, a distinct sealing section (10) at a rear of the projectile inside the projectile casing (2) around a rear portion of the projectile core (5), and a rotating band (7) being unitary with the sealing section (10) and being firmly connected to the sealing section (10) via the openings (9).

6. The method according to claim 5, comprising placing a centering finger (6) into the nose prior to placing a projectile core (5) within the casing.