Abstract: In automatic firearms having a caliber in the range of about 20 to 40 mm, so-called "jammed shell casings" are occasionally encountered due to the high cadences during the extraction and ejection of the empty cartridge casings, so that the returning breech mechanism tends to lose the cartridge, and the ejector plunger no longer fully impacts against the casing to be ejected. In order to avoid this drawback a recess arranged in the breech head concentrically to the firing pin is provided along its periphery opposite an extractor claw with at least one projection to assist in the centering and retention of the cartridge casing and which can be adapted to the respective type of breech mechanism. The projection is formed by cutting or non-cutting working. Preferably, two or more such projections are formed which then, together with the extractor claw, form a type of "three-point support" for the cartridge casing during the extraction.

Abstract: An arrangement for the measuring and correction of the steering geometry of motor vehicles, in particular their alignment and camber angles, through the intermediary of mechanical components associated with each wheel of a wheel pair and which serves for the scanning of the actual value of the wheel angles, whereby the values determined in this manner are converted into electrical signals through the utilization of data pick-ups and are then displayed.

Abstract: A projectile, comprises, an outer metallic hollow shell body and a shell core (for example hard metal or heavy metal) disposed in the body having a first cylindrical front portion and a rear portion having a lesser diameter than the front portion. A pyrophoric material liner is disposed on and secured to the rear portion and it is dimensioned such that its outer surface does not project outwardly beyond the surface of the front portion. The liner advantageously comprises a hollow cylinder or a plurality of hollow cylinders, or it may comprise individual strips arranged circumferentially around the rear portion. It is made of pyrophoric material which may comprise a single material or a plurality of different materials of different nature. It is secured to the shell core by press-fitting, cementing or screwing.

Abstract: A breech mechanism for automatic firearms having a high cadence; and, in particular, a rigidly closing breech mechanism which includes a gas piston effecting the opening thereof and which stands in communication with a sleeve, a coil spring concentrically positioned interiorly thereof which is stressed upon the opening of the breech mechanism and which will conduct a latching and unlatching component into its closing position upon release of the energy stored therein. The gas piston as well as the closure spring each have a shock absorber associated therewith. The shock absorbers essentially consist of loose, stacked discs, plates or the like of high rigidity and toughness, whose surfaces incorporate production-caused uneveness.

Abstract: The improved gun barrel insert is provided in tank-borne guns, field howitzers and the like. It makes possible the use of small caliber and thus less expensive ammunition having ballistic properties of the substituted larger caliber ammunition, while maintaining the opening, closing and igniting mechanisms provided for the larger caliber firing as well as the geometry and weight of the larger caliber cartridges. True combat conditions with a correct observation of shooting regulations can thereby be simulated to a very large extent and a high accuracy in hitting targets from shooting stands or moving bases can be obtained. The provided insert accommodates both a smaller-caliber cartridge and the igniting mechanism therefor. The insert is designed as a slightly tapering rotational symmetrical adapter conformable to the cartridge chamber of the larger caliber weapon. The conical front end of the adapter bears against the mating rear portion of the barrel insert proper.

Abstract: A recoil and counter recoil device for a firearm which can fire a plurality of shots in succession comprises a recoil spring bearing against a barrel and a receiver which receives the barrel for motion in a recoil and counter recoil direction and an annular spring which is axially deformable to exert a load connected between the barrel and the receiver to counteract the action of the recoil spring in the counter recoil direction to cause the barrel to float in a confined motion in the recoil and counter recoil directions during successive firing of the firearm.

Abstract: A machine is disclosed for testing of the oppositely located position of mechanical thread and a contact shoulder associated therewith on a pipe. A first measuring support is movably supported on a guide block in a first direction of movement and a second measuring support is resiliently supported on the first support in a linearly second direction of movement. First and second measuring heads are provided for movement in the first and second directions for measuring the threads and shoulder positions.

Abstract: A sight rail device for securing a sighting telescope to a shoulder firearm which includes a receiver having a barrel secured thereto and with a plurality of upright internally threaded hollow tubular mounting bolts disposed along the barrel and also partly along the receiver, comprises, a sight rail having an underside which conforms to the barrel and is disposed to overlie a portion of each and has a plurality of receiving bores defined in the underside which open toward the barrel and the receiver into which the mounting bolts extend. The sight rail also includes a dovetail-shaped sight-receiving recess for easily mounting the sight and a dovetail-shaped recess for easily mounting a baseplate for securing the sighting telescope.