Projectile for use in a barrel with a plurality of stacked projectiles
A projectile for use in a barrel with stacked projectiles, particularly for a weapon which can be reloaded by a user in the field. The projectile includes a chamber containing a propellant charge, with an exit from the chamber for release of propulsion gases into the barrel. A seal blocks the exit and is opened by ignition of the propellant within the chamber but is resistant to gases produced by ignition of propellant in other projectiles in the barrel. The exit and seal are provided in a range of different forms. The exit may be an aperture in a wall of the chamber with the seal as a moveable barrier, such as a valve-like structure, for example. The seal may also include a rupturable or deformable barrier across the aperture. Alternatively the seal is a thin barrier around the charge such as a wax coating and the exit involves a disintegrable character of the barrier. The seal may also be an inherent property of the geometry of the chamber.
1. A projectile for use in a barrel with a plurality of stacked projectiles, comprising:
a chamber containing a propellant charge;
an exit from the chamber for release of propellant gases into the barrel when the propellant is ignited to launch the projectile from the barrel;
an insert in the chamber, the insert including one or more openings through which the propellant gases pass;
a closure closing the exit and engaging against the insert, wherein the closure is opened by ignition of the propellant within the chamber; and
a retainer for maintaining the closure in engagement with the insert, wherein the closure is deformable between a closed condition and an open condition by deformation.
2. The projectile of claim 1 , wherein the open condition forms a throttle.
3. The projectile of claim 1 , wherein the insert is annular.
4. The projectile of claim 2 , wherein the insert is a disc.
5. The projectile of claim 1 , wherein the insert includes a plurality of openings.
6. The projectile of 1 , wherein the insert engages against a cylindrical wall of the chamber.
7. The projectile of claim 1 , wherein the closure deforms by rupturing along a line of weakness.
8. The projectile of claim 7 , wherein the line of weakness includes two intersecting lines of weakness.
9. The projectile of claim 1 , wherein the closure is a disc.
10. The projectile of claim 1 , wherein the exit is an aperture in a wall of the chamber.
11. The projectile of claim 1 , wherein the retainer is a separate component and engages with the chamber external to the exit.
12. The projectile of claim 11 , wherein the retainer comprises a jacket.
13. The projectile of claim 1 , wherein the retainer engages a cylindrical internal wall of the chamber.
14. The projectile of claim 13 , wherein the retainer is a separate component and engages with the chamber by a threaded engagement.
15. The projectile of claim 14 , wherein the projectile includes slots or a hexagonal surface for engaging a tool for advancing the threaded engagement.
16. The projectile of claim 1 , wherein the retainer is a separate component and maintains the closure in engagement with the insert by a threaded engagement.
17. The projectile of claim 16 , wherein the projectile includes slots or a hexagonal surface for engaging a tool for advancing the threaded engagement.
18. The projectile of claim 1 , wherein the closure is a seal and sealingly engages against the insert.
19. The projectile of claim 1 , wherein the closure is a seal and sealingly engages against the retainer.
20. The projectile of claim 1 , wherein the retainer is annular and propulsion gases pass through the retainer.