Messerschmitt-bolkow-blohm Gmbh

Dietrich Singelmann

German Munding

Heinrich Strobl

A propelling or driving force generating system for propelling a device such as projectile in a fire arm comprises a combustion chamber cylinder formed at the end of a barrel containing a bore for the passage of a projectile and in which is movable in pressure differential piston. The piston includes an annular ring portion having surfaces on respectively axially opposite ends which are exposed to pressure forces existing in intermediate chambers defined between these surfaces and end walls of the surrounding cylinder in widened annular portions of the cylinder. The cylinder and piston are provided with one or more passages for the passage of a propellant component into the combustion chamber. The various propellant components which are preferably of a nature such that they will react hypergolically, are connected through valve means in these passages and by a central plunger element of said valve means into the combustion chamber. Reaction of the components generates combustion gases in the combustion chamber to force the piston backwardly in a working stroke and to produce a force for expelling the projectile through the bore at the opposite end of the combustion chamber. The construction is characterized by an arrangement which provides an additional moving force on the piston in order to aid its working stroke movement at the initial stage of such movement.

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Ottobrunn, Germany

Dietrich Singelmann