Projectile obturator

Details Projectile obturator Projectile obturator

1986-04-18

1986-12-02

Tudor, Harold J.

Ammunition and explosives

Projectiles

Composite

102529, 102442, F42B 3100

Patent

active

H00001678

ABSTRACT:
An improved multipurpose projectile obturator of composite, frangible conuction where the obturator preferably forms part of a projectile that is launched from an upstanding tube. The tube interior is provided with an alternating series of helically arranged groove and land means. A projectile at its propellant end is provided with an annular shoulder that faces in a direction toward the propellant end. An obturator is generally made up of an elastomeric band of a suitable grade of rubber. The band in being placed about the projectile surface and against the shoulder is positively retained as the projectile is inserted in the tube and launched therefrom. The outer periphery of the band has an annular groove for receiving a ring-like element. This element is preferably of three-ply construction and is also preferably made up of two half sections that are suitably bonded to the groove about the band periphery. The outer ply of the element is provided with a plurality of bristle or wire-like elements for wipingly engaging the series of land means when the projectile is inserted in the tube. Also, each wire-like element of the plurality extends at an oblique angle and in a counterclockwise direction when viewed from the warhead end of the projectile. The projectile is provided with a series of helically extending and circumferentially spaced rib means for slidably engaging interior surface portions of the tube when the projectile is inserted in the tube. The series of wire-like elements in engaging the series of land means not only clean propellant residue buildup therefrom but also cooperate with the rib means in stabilizing the projectile in its inserted oriented position without binding engagement as it is lowered into the tube. When the projectile is initially launched from the tube, the trailing peripheral wedge-shaped and longitudinally slotted edge of the obturator assists in fully separating the obturator from the projectile so as to minimize projectile drag.

REFERENCES:
patent: 4242961 (1981-01-01), Moredock et al.
patent: 4532868 (1985-08-01), Gleichaut et al.
patent: 4552071 (1985-11-01), Horais et al.

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