Compressed gas powered ammunition for guns

• US 4,697,523 A
• Filed: 12/26/1985
• Issued: 10/06/1987
• Est. Priority Date: 01/11/1985
• Status: Expired due to Fees

• Current Assignee: Brocock Limited 14 Melford Hall Road Solihull West Midlands B91 2ES
• Original Assignee: Hilvenna Limited
• Inventors: Saxby, Michael E.
• Primary Examiner(s): Kyle, Deborah L.
• Assistant Examiner(s): Carone, Michael J.
• Application Number:
  US06/813,062
• Time in Patent Office: 649 Days
• Field of Search: 124/57, 124/70, 124/74, 42/16, 102/430, 102/440
• US Class Current: 102/440
• CPC Class Codes: F41B 11/62 with pressure supplied by a gas cartridge
• CPC Class Codes: F42B 6/10 Air gun pellets ; Ammunition for air guns, e.g. propellant-gas containers

Abstract

A simple to manufacture high pressure rechargeable ammunition cartridge comprising a hollow pressure casing 20 providing a gas storage space 19 to hold compressed gas therein, with a discharge passage 25 in a front part of said casing said gas storage space; an actuation passage 24 extending into said casing from the rear; a valve opening 52 at a front end of said actuation passage, and a valve member which has a normal position wherein it closes said valve opening and blocks said discharge passage, and is movable bodily forwards as shown from said normal position to open both said valve opening and said discharge passage to allow gas to escape from the pressure casing directly through both of said passages to drive a missile. The valve member may be modified so as to be dischargeable from the cartridge and may form part of a missile.

Claims

1. A rechargeable ammunition cartridge comprising:

(a) a hollow pressure casing having a rear end and defining a gas storage space to hold compressed gas therein;

(b) a discharge passage in a front part of said casing and open to said gas storage space;

(c) an actuation passage extending into said casing and open at the rear of said casing;

(d) a valve opening disposed at a front end of said actuation passage and open to said gas storage space; and

(e) a valve member in said casing and having a normal position wherein it closes said valve opening at one end thereof and blocks said discharge passage with another portion thereof,

(f) said valve member is movable bodily forwardly from said normal position to open both said valve opening and said discharge passage to allow gas to escape from the pressure casing directly through both of said passages; and

(g) said valve member is dischargeable from the casing via the discharge passage.

2. A rechargeable ammunition cartridge comprising:

(a) a hollow pressure casing having a rear end and defining a gas storage space to hold compressed gas therein;

(b) a discharge passage in a front part of said casing and open to said gas storage space;

(c) an actuation passage extending into said casing and open at the rear of said casing;

(d) a valve opening disposed at a front end of said actuation passage and open to said gas storage space;

(e) a valve member in said casing and having a normal position wherein it closes said valve opening at one end thereof and blocks said discharge passage with another portion thereof;

(f) said valve member is movably bodily forwardly from said normal position to open both said valve opening and said discharge passage to allow gas to escape from the pressure casing directly through both of said passages; and

(g) said movable valve member having a rear portion of a predetermined area which engages a surface around the valve opening,

(h) said predetermined area being greater than the cross-sectional area of the portion of the discharge passage blocked by the valve member in the normal position, so that the gas pressure in the gas storage space exerts a resultant rearwardly directed force on the valve member; and

(i) a missile is disposed at the front of the casing, and

(j) said valve member is end-for-end symmetrical the maximum dimensions of said valve member is less than the missile diameter.

3. A rechargeable ammunition cartridge comprising:

(a) a hollow pressure casing having a rear end and defining a gas storage space to hold compressed gas therein,

(b) a discharge passage in a front part of said casing and open to said gas storage space;

(c) an actuation passage extending into said casing and open at the rear of said casing;

(d) a valve opening disposed at a front end of said actuation passage and open to said gas storage space; and

(e) a valve member in said casing and having a normal position wherein it closes said valve opening at one end thereof and blocks said discharge passage with another portion thereof,

(f) said valve member is movable bodily forwardly from said normal position to open both said valve opening and said discharge passage to allow gas to escape from the pressure casing directly through both of said passages;

(g) said movable valve member having a rear portion of a predetermined area which engages a surface around the valve opening,

(h) said predetermined area being greater than the cross-sectional area of the portion of the discharge passage blocked by the valve member in the normal position, so that the gas presure in the gas storage space exerts a resultant rearwardly directed force on the valve member;

(i) said valve member being disposed on a missile.

4. A rechargeable ammunition cartridge comprising in combination:

(a) a hollow pressure casing having a rear end and defining a gas storage space to hold compressed gas therein,

(b) a discharge passage in a front part of said casing and open to said gas storage space;

(c) an actuation passage extending into said casing and open at the rear of said casing;

(d) a valve opening disposed at a front end of said actuation passage and open to said gas storage space;

(e) a valve member in said casing and having a normal position wherein it closes said valve opening at one end thereof and blocks said discharge passage with another portion thereof;

(f) said valve member is movable bodily forwardly from said normal position to open both said valve opening and said discharge passage to allow gas to escape from the pressure casing directly through both of said passages;

(g) the movable valve member including resilient sealingmeans to seal said valve opening and said discharge passage in said normal position;

(h) charging means providing an abutment engageable by the movable valve member to hold said valve member substantially in said normal position during charging.

5. The combination of a gun and a cartridge for propelling a missile, the combination comprising:

(a) a hollow pressure casing having a rear end and defining a gas storage space to hold compressed gas therein;

(b) a discharge passage in a front part of said casing and open to said gas storage space;

(c) an actuation passage extending into said casing and open at the rear of said casing;

(d) a valve opening disposed at a front end of said actuation passage and open to said gas storage space;

(e) a valve member in said casing and having a normal position wherein it closes said valve opening at one end thereof and blocks said discharge passage with another portion thereof,

(f) said valve member is movable bodily forwardly from said normal position to open both said valve opening and said discharge passage to allow gas to escape from the pressure casing directly through both of said passages; and

(g) a gun including a breech block provided with a firing pin and with safety means to interengage safety means provided at the base of the cartridge to allow the breech block to be advanced to a position in which the firing pin is opertive to discharge the cartridge.

6. A cartridge as claimed in claim 5 wherein

the gun has an elongate firing pin mounted on the breech block, and

the breech block includes a front portion to close the gun breech, a rear portion on which the firing pin is mounted and bias means thrusting the rear portion rearwards relative to the front portion to urge the breech block to an extended condition in which the firing pin is retracted into the front portion.

7. A cartridge as claimed in claim 6 wherein

the gun includes breech block control means for moving the breech block and moving the rear portion forwardly relative to the front portion to extend the firing pin to project in front of the front portion along said actuation passage.

8. A rechargeable ammunition cartridge comprising:

(a) a hollow elongate presure casing including a front portion and a rear portion;

(b) a gas storage space in said casing between said front portion and said rear portion;

(c) a rearwardly opening actuation passage extending forwardly through said rear portion;

(d) a valve opening at a front end of said actuation passage and open to said gas storage space;

(e) a forwardly opening discharge passage extending rearwardly through said front portion and open to said gas storage space;

(f) a sole valve member movably disposed in said casing;

(g) said valve member including elastomeric sealing means to effect sealing between said valve member and said discharge passage in a normal position of said valve member;

(h) said discharge passage including a cylindrical throat engaged by said sealing means in said normal position and is forwardly open to permit said sealing means to slide forwardly through the throat;

(i) said valve member is of non-servo form and includes firstly, a closure member portion, which in said normal position closes and abuts said valve opening to prevent rearward movement of the valve member, secondly a plug, which in said normal position is accommodated in said throat and cooperates with said sealing means to seal said throat, and, thirdly, a part rigidly connecting said plug and closure member portion;

(j) said valve member being movable only integrally bodily forwardly from said normal position, to move the closure member forwardly from said valve opening, and, in unison therewith, to slide the plug forwardly through and beyond the throat, to open both said valve opening and said throat for direct escape of compressed gas therethrough for simultaneous discharge of gas forwardly direct through the discharge passage and rearwardly direct through the actuation passage in said casing.

9. A cartridge as claimed in claim 8 wherein

the actuating passage is coaxial with the longitudinal axis of the casing.

10. A cartridge as claimed in claim 8 wherein

the valve member includes an actuating member section slidably disposed in said actuating passage and exposed at a rearward end of the casing.

11. A cartridge as claimed in claim 8 wherein

the valve opening is defined by resilient sealing means,

said resilient sealing means being fixed in the casing and abutted by the closure member in said normal position to prevent rearward movement of the valve member.

12. A cartridge as claimed in claim 8 wherein

the valve opening has a greater diameter than said cylindrical throat.

13. A cartridge as claimed in claim 8 wherein

a rearward part of the valve member rigidly includes the actuating member,

the valve member is captive in said casing, and

a spring is disposed in the casing to engage the valve member and extend forwardly in said storage space to engage said front portion within the casing.

14. A cartridge as claimed in claim 8 wherein

the valve member carries stop means to limit forward movement of valve member from said normal position by engagement with the casing within said sapce, and

the valve member includes an integrally formed actuating member and extends susbstantially from front to rear of said casing, coaxial within the casing, in said normal position.

15. A cartridge as claimed in claim 8 wherein

the closure member includes further elastomeric sealing means mounted on the valve member adjacent to and forwards of the closure member,

said casing includes an internal surface around said valve opening, which surface is engaged by said further sealing means and extends to a diameter greater than the diameter of the throat, so that the gas in said space exerts a resultant net rearwardly directed force on said valve member to retain the latter in said normal position, and

said casing is abutted rigidly by said valve member to prevent rearward movement of the valve member from said normal position.

16. A cartridge as claimed in claim 15 wherein

said internal surface is forwardly divergent.

17. A cartridge as claimed in claim 15 wherein

said internal surface is cylindrical.