# US 5,703,322 A · Cartridge having high pressure light gas

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- Number: US 5,703,322 A
- Document ID: US5703322A
- Status: Granted
- Kind: A
- Application number: 08/382,704
- Filed: 1995-02-02
- Granted: 1997-12-30
- Earliest claimed: 1995-02-02
- Assignees: General Dynamics Land Systems, Inc.
- Inventors: Derek A. Tidman
- Web page: https://patentgrep.com/patent/US5703322A

## CPC

- F42B 5/16: characterised by composition or physical dimensions or form of propellant charge, {with or without projectile,} or powder (chemical composition C06B; {F42B5/24 takes precedence})
- C06B 47/02: the components comprising a binary propellant
- C06D 5/00: Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets (explosive compositions containing an oxidizer, fuels for rocket engines intended for reaction with an oxidant other than air C06B)
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)
- C06B: EXPLOSIVES OR THERMIC COMPOSITIONS (blasting F42D); MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES (compounds in general C01, C07 or C08; {demolition agents based on cementitious or like materials C04B41/0009})
- C06D: MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART) (fuels C10)

## Abstract

A cartridge for accelerating a projectile includes a light gas pressurized in a sealed container to 5,000-10,000 psi. Upon ignition in the sealed container, a gas mixture having a low or intermediate molecular weight and a high or low energy density is applied as a high sound speed gas to accelerate the projectile to speeds of above about 2.4 km/sec.

## Claims

### Claim 1

A cartridge comprising a housing carrying a projectile, the housing including:
a sealed container structure including: a mixture comprising an oxidizer gas and helium gas at a pressure of at least several hundred atmospheres, a fuel having molecules including hydrogen atoms, a solid propellant, a front wall structure confining a mass in the sealed container structure from the projectile; the propellant, fuel, oxidizer gas, helium gas, sealed container structure and front wall structure being positioned, arranged and including materials so that in response to ignition within the sealed container structure, the propellant, fuel, helium gas and oxygen from the oxidizer gas are further pressurized and mixed to increase the pressure on the front wall structure to a sufficiently high value to burst the front wall structure so a gas mixture including the fuel, helium gas and oxygen having a pressure substantially higher than the pressure of the mixture in the sealed container structure is applied to the projectile to accelerate the projectile in a barrel in which the projectile is located.

### Claim 2 (depends on 1)

The cartridge of claim 1 wherein the sealed container structure includes the propellant and a piston means positioned between the propellant and gas in a forward portion of the sealed container structure, the propellant when ignited generating combusting gas behind the piston structure to drive the piston means forward and to increase the pressure on the combusting gas in the forward portion of the sealed container structure and cause high pressure gas initially in the sealed container structure to be supplied to the projectile considerably prior to gas resulting from combustion of the solid propellant.

### Claim 3 (depends on 2)

The cartridge of claim 2 wherein the gas in the mixture in the sealed container structure has a relatively low energy density below about 7 kilojoules per gram.

### Claim 4 (depends on 3)

The cartridge of claim 3 wherein the sealed container structure includes a single sealed container, and the piston means comprises a single piston having openings so the same mixture is resident on both sides of the piston.

### Claim 5 (depends on 2)

The cartridge of claim 2 wherein the piston means includes openings so the gas is resident on both sides thereof.

### Claim 6 (depends on 5)

The cartridge of claim 5 wherein the solid propellant comprises multiple rods surrounded by the gas in the sealed container structure.

### Claim 7 (depends on 6)

The cartridge of claim 6 wherein the rods are elongated in a direction of gas flow through the ruptured diaphragm means.

### Claim 8 (depends on 1)

The cartridge of claim 1 wherein the sealed container structure includes plural nested sealed containers, some including helium and an oxidizer gas at pressures of at least several hundred atmospheres and others including fuel at pressures approximately equal to the pressure in said some containers, the nested sealed containers and the propellant being positioned and arranged so ends of the sealed containers proximate the projectile and included in the front wall structure are ruptured and gas from the plural containers is mixed and ignited behind the projectile in response to increased gas pressure produced in the plural sealed containers in response to ignition of the propellant.

### Claim 9 (depends on 8)

The cartridge of claim 8 wherein the sealed containers include the propellant therein.

### Claim 10 (depends on 9)

The cartridge of claim 9 wherein the sealed containers include a piston therein, each of the pistons being positioned between the propellant and gas in a forward portion of the particular sealed container, the propellant in the particular sealed container when ignited generating gas behind the piston in the particular sealed container to drive the piston in the particular sealed container forward and to increase the pressure on the gas in the forward portion of the particular sealed container.

### Claim 11 (depends on 10)

The cartridge of claim 10 wherein the pistons include openings so the same gas is resident on both sides of the pistons.

### Claim 12 (depends on 8)

The cartridge of claim 8 wherein the helium and oxygen in said some sealed containers have mole fractions such that the resulting mixture has a relatively high energy density of about 10 kilojoules/gram when mixed and combusted with the fuel to combine with the oxygen.

### Claim 13 (depends on 8)

The cartridge of claim 8 wherein each of the sealed containers includes the propellant therein.

### Claim 14 (depends on 9)

The cartridge of claim 9 wherein each of the sealed containers includes a piston therein, each of the pistons being positioned between the propellant and gas in a forward portion of the particular sealed container, the propellant in the particular sealed container when ignited generating gas behind the piston in the particular sealed container to drive the piston in the particular sealed container forward and to increase the pressure on the gas in the forward portion of the particular sealed container.

### Claim 15

A cartridge comprising
a housing carrying a projectile,
the housing including: a sealed container structure including a first gas at a pressure of at least several hundred atmospheres, a fluid reactant sealed to a pressure of at least several atmospheres, the gas including an oxidizer gas and at least 50% by mole fraction of helium, a solid propellant, a diaphragm structure confining the gas in the sealed container structure from the projectile, the propellant, gas, reactant, sealed container structure and diaphragm structure being positioned, arranged and having constituents so that in response to ignition of constituents in the sealed container structure the first gas and the reactant are mixed and further pressurized to increase the pressure on the diaphragm means to a sufficiently high value to burst the diaphragm structure so there is formed a light gas mixture including the gas and reactant in gaseous form having a molecular weight below about 12, the light gas mixture having a pressure substantially higher than the pressure of the mixture in the sealed container structure and being applied to the projectile to accelerate the projectile in a barrel in which the projectile is located.

### Claim 16 (depends on 15)

The cartridge of claim 15 wherein the gas and reactant are respectively first and second gases, the second gas having a pressure of at least several hundred atmospheres.

### Claim 17 (depends on 16)

The cartridge of claim 16 wherein the first and second gases are sealed in the same container and together form a gas mixture having a relatively low energy density in the range below about 7 kilojoules/gram and a relatively low molecular weight no higher than about 12.

### Claim 18 (depends on 15)

The cartridge of claim 15 wherein the gases are at ambient temperature.

### Claim 19 (depends on 17)

The cartridge of claim 17 wherein the gas mixture consists essentially of n.sub.1 He+n.sub.2 O.sub.2 +O, where n.sub.2 is smaller than n.sub.1 and O is a fuel in an amount sufficient to at least consume all the oxygen.

### Claim 20 (depends on 19)

The cartridge of claim 19 wherein Q is selected from the group consisting essentially of H.sub.2 and CH.sub.4.

### Claim 21 (depends on 17)

The cartridge of claim 17 wherein the container includes a piston positioned behind a forward portion of the container, gas behind the piston when ignited driving the piston forward to increase the pressure on gas in the forward portion of the sealed container.

### Claim 22 (depends on 21)

The cartridge of claim 21 wherein the solid propellant is located in the container behind the piston.

### Claim 23 (depends on 22)

The cartridge of claim 22 wherein the piston includes openings so the same gas is resident in the sealed container on both sides of the piston.

### Claim 24 (depends on 23)

The cartridge of claim 23 wherein the propellant is elongated in the direction of gas flow through the diaphragm.

### Claim 25 (depends on 16)

The cartridge of claim 16 wherein the first and second gases are sealed in different containers.

### Claim 26 (depends on 25)

The cartridge of claim 25 wherein the oxidizer consists essentially of oxygen.

### Claim 27 (depends on 25)

The cartridge of claim 25 wherein the second gas consists essentially of a fuel.

### Claim 28 (depends on 27)

The cartridge of claim 27 wherein the fuel is a hydrocarbon.

### Claim 29 (depends on 28)

The cartridge of claim 28 wherein the hydrocarbon fuel is methane.

### Claim 30 (depends on 25)

The cartridge of claim 25 wherein a container including the first gas is in front of a container including the second gas.

### Claim 31 (depends on 30)

The cartridge of claim 30 wherein the container including the second gas includes solid propellant rods behind at least a portion of the second gas.

### Claim 32 (depends on 25)

The cartridge of claim 25 wherein many of the containers are nested together so containers including the first gas are next to containers including the second gas.

### Claim 33 (depends on 32)

The cartridge of claim 32 wherein the gases in the many containers are arranged so the mixture has a high energy density between about 7-12 kilojoules per gram, and consists essentially of helium, oxygen and a hydrocarbon fuel component.

### Claim 34 (depends on 33)

The cartridge of claim 33, wherein the hydrocarbon fuel is methane.

### Claim 35 (depends on 33)

The cartridge of claim 33 wherein the first gas consists essentially of a mixture of helium and oxygen.

### Claim 36 (depends on 35)

The cartridge of claim 35 wherein the second gas consists essentially of the fuel.

### Claim 37 (depends on 32)

The cartridge of claim 32 wherein containers including the first and second gases include a piston positioned behind a forward portion of the container, gas behind the piston when ignited driving the piston forward to increase the pressure on gas in the forward portion of the sealed container.

### Claim 38 (depends on 37)

The cartridge of claim 37 wherein the solid propellant is located in the containers behind the pistons.

### Claim 39 (depends on 38)

The cartridge of claim 38 wherein each of the pistons includes openings so the same gas is resident in the sealed containers on both sides of the pistons.

### Claim 40 (depends on 16)

The cartridge of claim 16 wherein the first and second gases are sealed in the same container.

### Claim 41 (depends on 16)

The cartridge of claim 16 wherein all of the first and second gases are sealed in a single container.