Expelling charge ignition system

Claim 1

A rocket carrying a payload for ejectment at a predetermined point along its trajectory comprising: a combustion chamber containing rocket propulsion fuel for propelling said rocket along a fixed path; a compartment attached to said chamber having one end nearest said combustion chamber filled with an explosive charge for supplying a rapid expanding force; shock reducing material positioned adjacent and in contact with said explosive charge for completely enclosing said explosive charge within an end portion of said chamber; communicating passageway concentric with said compartment and said combustion chamber; a circular plug member having a reduced diameter portion at one End to form a shoulder and a cavity at its other end, said plug member positioned between said chamber and said compartment and operable to open and close said communication passageway; a spring housed partially within the cavity in said circular plug and compressed in its closed position; and heat sensitive restraining collar fixably secured to said compartment and said plug at its reduced diameter portion for holding said plug member in a position to close said passageway; whereby the completed burning of the propulsion fuel in the combustion chamber causes hot gases to impinge upon the restraining collar allowing the passage of hot gases through the passageway to ignite the expelling charge to forcibly eject the payload from the compartment after the spring pressure overcomes the combustion chamber pressure.