Abstract: A pyrotechnic piston device the housing of which has a cylindrical internal wall in which is mounted a piston. A pyrotechnic device is disposed adjacent the piston. A metal-to-metal seal is formed between the piston and the cylindrical wall to prevent blow-by of products of the explosion. Two types of constructions are provided to prevent bounce-back of the piston after it has reached the forward end of its stroke.

Abstract: A detonator-activated ball shutter for closing an aperture in about 300.mu. seconds. The ball shutter containing an aperture through which light, etc., passes, is closed by firing a detonator which propels a projectile for rotating the ball shutter, thereby blocking passage through the aperture.

Abstract: A gunpowder fueled internal combustion engine having a cylinder block with a plurality of cylinders circularly arranged in the cylinder block.An upper housing is located on the cylinder block in which is contained a storage chamber for storing the gunpowder. An air intake system is also provided in the upper housing. A metering system is included for sequentially directing controlled amounts of gunpowder and air from the upper housing to each cylinder where the gunpowder and air mixture can be burned within the cylinder. A crank shaft arrangement is provided in the cylinder block. Pistons reciprocatingly associated with each cylinder drive the crank shaft system.

Abstract: A fuel delivery system for an internal combustion engine. A fuel supply chamber is located adjacent the combustion chamber and is in communication with the combustion chamber. A fuel supply line communicates with the fuel chamber. A valving piston is movable in said fuel chamber and a fuel port or pocket is formed between the valving piston and the fuel chamber. The valving piston is actuable to place the fuel port in communication with the combustion chamber to deliver discrete quantities of fuel to support combustion. The valving piston may be mechanically, hydraulically, pneumatically or electrically operated. Means are also disclosed which cooperate with the valving piston to expel fuel from the port in the fuel delivery position.

Abstract: An intake passage between a carburetor and combustion chambers is provided with small openings along the periphery thereof for communicating the intake passage with the atmosphere. Each opening restricts the introduction of air to a small volume insufficient to cause cross turbulence of air-fuel stream in the intake passage, and the sum total area of the openings is made not to exceed 30% of the total air intake area for the carburetor.

Abstract: An explosively powered tool or wrench is described that is operable under water and provides high torque, approaching that of an impact wrench, through the detonation of small charges to generate pressure for driving pistons of an expansible chamber motor. The invention is characterized by a rotating magazine for automatically or manually bringing charges into firing position, a magazine position indicator, and electrical firing control circuitry.

Abstract: An apparatus for injecting pulverulent fuel into the combustion chamber of internal combustion engines includes a pre-chamber for the fuel powder which is to be supplied to the combustion chamber during an engine cycle. This pre-chamber is adapted, during an engine cycle, to be successively connected to a vacuum source, a fuel supply and the combustion chamber. To this end, the apparatus includes a movable member having the pre-chamber formed therein and being adapted, by co-operation with sealing elements applied under pressure against the movable member, sealingly to engage fixed connections leading to the vacuum source, the fuel supply and the combustion chamber. During the operating cycle of the movable member the pre-chamber successively passes the aforementioned connections so as to be placed in communication with the vacuum source, the fuel supply and the combustion chamber.