| 摘要 |
A cartridge comprises a shell 3 with a bullet 2 inserted into and mechanically connected to the shell 3, and a propellant 5 located in a propulsion chamber 4 of the shell 3. When the propellant 5 is ignited by a primer 13 it produces propellant gases. These gases drive the bullet 2 out of the shell 3. The shell 3 has passages 14 that exit the propulsion chamber 4 and penetrate the shell 3. These passages 14 are filled with a fusible material 15 with a melting temperature less than the ignition temperatures of the propellant 5 and primer 13. If the ambient temperature rises above the melting point of the fusible material 15, the fusible material 15 will melt opening the passages 14. This arrangement prevents pressure building up if the propellant 5 and primer 13 ignite and prevents the cartridge from exploding in a fire.
|
