Grenade shell has piston sealing channels between high pressure chamber containing propellant charge surrounded by low pressure chamber, and which is moved upwards by propellant gases when shell is fired

摘要

Grenade shell has a piston (7) which seals the channels (13) between the high pressure chamber (12) containing the propellant charge (6) and the low pressure chamber (14) surrounding it. When the shell is fired, this is moved upwards by the propellant gases and opens the channels.