Caseless projectile and launching system

Patent metadata

Field	Value
Publication number	US-9759499-B2
Application number	US-201615355984-A
Country	US
Kind code	B2
Filing date	Nov 18, 2016
Priority date	Dec 20, 2011
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A launcher system includes a launcher having a sealed breech and a barrel adapted to receive a projectile with a charge of propellant and a mechanism to vary the launch velocity by selectively controlling the propellant gases vented out of the projectile and into the barrel. A collar can be repositioned through rotation or sliding movement to selectively allow propellant gases to vent out of the barrel or stop propellant gases from venting out of the barrel. When the collar is in a closed or non-venting configuration, propellant gasses build-up pressure behind the projectile, resulting in a relatively high launch velocity and, when the collar is in the open or venting configuration, a relatively low launch velocity is produced. A sliding breech face and energy-absorbing plug can also be provided to further decrease launch velocity.

First claim

We claim:

1. A launcher system comprising:
a projectile including:
a main body having at least one vent hole, and
a charge provided in the main body; and

a launcher including:
a sealed breech,
a barrel adapted to receive the projectile, said barrel having a vent hole,
a mechanism for activating the projectile whereby, when the mechanism activates the projectile and the charge is initiated, gas is created which exits the main body through the at least one vent hole to provide thrust for the projectile, and
a collar formed with a passageway being mounted on the barrel and selectively movable from a non-venting position blocking the gas from exiting the vent hole to a venting position allowing the gas to pass from the barrel through the vent hole in the barrel into the passageway and to atmosphere whereby movement of the collar controls the launch velocity of the projectile.

2. The launcher of claim 1 , wherein the collar is rotatable about the barrel from the venting position to the non-venting position so as to cover the vent hole in a progressive manner to provide continuous variable control of the launch velocity.

3. The launcher of claim 1 , wherein the collar is slidable relative to the barrel between the venting position and the non-venting position so as to cover the vent hole in a progressive manner to provide continuous variable control of the launch velocity.

4. The launcher of claim 1 , wherein the barrel includes a groove that aligns with the passageway when the collar is in the venting position, said groove being slanted to control how fast the gas passes from the barrel.

5. The launcher of claim 1 , further comprising a handle extending from the collar for selectively moving the collar from the venting position to the non-venting position.

6. A launcher for firing projectiles comprising:
a barrel; and
a breech, at least a portion of the breech being configured to slide relative to the barrel when the launcher is fired to vary a launch velocity of a projectile fired from the launcher.

7. The launcher of claim 6 , further comprising an energy absorbing plug located behind the portion of the breech.

8. The launcher of claim 7 , further comprising a bolt formed with an internal bore, the portion of the breech and the energy absorbing plug being located in the internal bore.

9. The launcher of claim 8 , further comprising an adjustable plug located in the internal bore, with the adjustable plug being configured to apply a preload to the energy absorbing plug.

10. The launcher of claim 8 , further comprising a detent connected to the portion of breech, wherein the bolt includes a slot and said detent is movable in the slot from a locked position, preventing the portion of the breech from moving, to an unlocked position, allowing the portion of the breech to move in order to reduce the launch velocity of the projectile.

11. The launcher of claim 10 , wherein the portion of the breech includes a breech face configured to be aligned with a piston located in the projectile, whereby additional energy is imparted to the projectile when the detent is in the locked position and more energy is absorbed by the energy absorbing plug when the detent is in the unlocked position.

12. The launcher of claim 11 , wherein the portion of the breech is made of steel.

13. The launcher of claim 12 , wherein the energy absorbing plug is made of urethane.

14. The launcher of claim 12 , wherein the energy absorbing plug is constituted by a coil spring.

15. A launcher system comprising:
a projectile including:
a main body having at least one vent hole, and
a charge provided in the main body; and

a launcher including:
a barrel adapted to receive the projectile, said barrel having a vent hole and either:
a) a sealed breech, a mechanism for activating the projectile whereby, when the mechanism activates the projectile and the charge is initiated, gas is created which exits the main body through the at least one vent hole to provide thrust for the projectile, and a collar formed with a passageway being mounted on the barrel and selectively movable from a non-venting position blocking the gas from exiting the vent hole to a venting position allowing the gas to pass from the barrel through the vent hole in the barrel into the passageway and to atmosphere whereby movement of the collar controls the launch velocity of the projectile; or
b) a breech, at least a portion of the breech being configured to slide relative to the barrel when the launcher is fired to vary a launch velocity of a projectile fired from the launcher; or
c) both a) and b).

16. The launcher of claim 15 , wherein the collar is rotatable about the barrel from the venting position to the non-venting position so as to cover the vent hole in a progressive manner to provide continuous variable control of the launch velocity.

17. The launcher of claim 15 , wherein the collar is slidable relative to the barrel between the venting position and the non-venting position so as to cover the vent hole in a progressive manner to provide continuous variable control of the launch velocity.

18. The launcher of claim 15 , further comprising an energy absorbing plug located behind the portion of the breech.

19. The launcher of claim 18 , further comprising a bolt formed with an internal bore, the portion of the breech and the energy absorbing plug being located in the internal bore.

20. The launcher of claim 19 , further comprising an adjustable plug located in the internal bore, with the adjustable plug being configured to apply a preload to the energy absorbing plug.

Assignees

• Battelle Memorial Institute

Inventors

• Widder Jeffrey M
• Perhala Christopher A
• Rascoe James R

Classifications

• F42B5/184

  telescopic · CPC title

• F41A1/06 Primary

  Adjusting the range without varying elevation angle or propellant charge data, e.g. by venting a part of the propulsive charge gases, or by adjusting the capacity of the cartridge or combustion chamber {(adjusting the range by using gas-relieving ports in the barrel F41A21/28)} · CPC title

• F41A21/28

  Gas-expansion chambers; Barrels provided with gas-relieving ports (F41A1/06, F41A13/08 {and F41A21/36} take precedence) · CPC title

• F42B15/00

  Self-propelled projectiles or missiles, e.g. rockets; Guided missiles (F42B10/00, F42B12/00, F42B14/00 take precedence; for practice or training F42B8/12; rocket torpedoes F42B17/00; marine torpedoes F42B19/00; cosmonautic vehicles B64G; jet-propulsion plants F02K) · CPC title

• F42B5/18

  Caseless ammunition; Cartridges having combustible cases · CPC title