Abstract: The present invention relates to a receiver and a recoil lug for a gun. The receiver and the recoil lug with which the receiver is arranged to be fastened to the stock of the gun, are manufactured as separate pieces in accordance with the invention. A characteristic of the invention is that the receiver is manufactured by cold-hammering, inner and outer surfaces thereof are finished. Another feature of the present invention is that the recoil lug is fastened to the receiver by driving the same to form a tight force fit between the two, with guiding surfaces for the gun barrel being formed onto the receiver and onto the recoil lug. The receiver is manufactured to be substantially symmetrical with respect to a longitudinal axis thereof, with an external, shouldered connecting surface being shaped onto the receiver. An annular inner surface is shaped onto the recoil lug which, together with the connecting surface of the receiver, forms the force fit.

Abstract: A foldable firearm stock for use with a grenade launcher or other weapon. A hinged butt portion, when moved into the folded configuration releases the lock permitting the stock frame to pivot from an extended position to a storage position above and aligned with the weapon barrel.

Abstract: A gun safety device is detachably mounted on a gun barrel for capturing a projectile, wherein when mounted, at least a portion of the projectile capturing device breaks free of the gun, capturing a projectile fired therefrom. Optionally, the gun safety device can include a housing detachably mounted on the gun barrel and lockably attachable to the housing. The invention also includes a method for capturing a projectile from a gun.

Abstract: The present invention provides a grenade with dynamic arming having a body and a fuse, in which arming of the fuse is made dependent on the dynamic unwinding of a ribbon which surrounds the fuse and which is weighted with an inertia block at the end of winding, wherein said inertia weight is held in position, before the grenade is thrown, by a long safety piece, called spoon, said weight is not secured to the spoon and, at the very beginning of the trajectory of the grenade, the inertia causes both ejection of the spoon and displacement of the inertia weight, this displacement causing dynamic unwinding of the ribbon and arming of the fuse.

Abstract: A combustion chamber, such as for a gas turbine engine, includes a protective liner comprised of a plurality of arcuate panels attached to the combustion chamber wall by means of hook-like hangers or lugs integral with and extending radially from the panels through slots in the combustion chamber wall. The lugs hang from retaining strips disposed across a portion of the slots through which the hangers pass. The strips prevent the lugs from being withdrawn from the slots, thereby, positioning the panels radially. Axial and circumferential positioning of the panels is accomplished by means of a close fit between the hangers, slots, and retaining strips. The free floating or nonrigid manner in which the liner panels are attached to the combustion chamber prevents undue stresses from developing in the combustion chamber wall due to the differential thermal growth rates of the combustion chamber wall and the liner panels during engine operation.

Abstract: A novel detonator is equipped with an instant-trigger primer element. The detonator can be triggered mechanically and provides rapid ignition of the delay charge. In this manner, misfires are avoided which occur due to the fact that in case of an only slight impact, a spring-loaded firing pin is again pulled out of the detonator even before igniting the delay charge and can render the detonator useless because of pressure relief. The primer element contained in the detonator exhibits an outer casing into which is embedded, in a shape-mating fashion, an inner casing so that the bottoms of both casing are placed in mutual superposition in such a way that a cavity is formed between them, this cavity being furthermore defined by the sidewall of the outer casing. This cavity houses the primer charge which is to contain, besides the usual oxidants and reducing agents, rapidly acting initiating explosives. A directional ignition jet is produced by a special configuration of an ignition duct.

Abstract: A handgun handle construction including a handle frame, elastomer grip element portions positioned on the sides, including as desired on the front and back sides, of the handle frame. The elastomer grip element portions have recesses to each receive a non-deformable insert element. Fasteners hold the frame, grip element portions and inserts together.

Abstract: A pneumatic recoil reduction device for a shotgun. The device, fitted into a cavity in the butt end of a shotgun, has an air cylinder equipped with a valved hole, or port, which is located in the end of the air cylinder, closest to the butt end of the shotgun. This permits adjusting the pressure in the air cylinder from the rear without disassemblying the butt stock.

Abstract: A safety device for an automatic pistol of the double action type includes an automatic safety on the firing pin and has a striking lever for the hammer. The device comprises a cammed shaft, rotatably mounted to a breech block of the pistol and displaceable manually in one direction for control of the lever for disengagement of the hammer. The cam shaft is rotatable in an opposite direction by means of a spring-loaded piston for blocking the shaft in a rest position where it does not interfere with firing of the pistol.

Abstract: An ultrasonic transducer and method for detecting the distance to an object using ultrasonic energy. The transducer includes a foil which creates ultrasonic energy. First and second reference surfaces are provided which are spaced between the transducer and the object. The two reference surfaces provide for immunity against temperature and positional changes.

Abstract: The insulation resistance between the electroded surfaces of an underwater transducer and the water within which the transducer is immersed is greatly improved by coating the electroded surface of the transducer with a layer of air-free, high-resistance waterproof material before bonding an elastomer covering over the assembly to serve as the outer housing.

Abstract: A structure for attenuating explosive shock waves to prevent propagation of accidental explosions by sympathetic detonation of adjacent explosives comprising bidirectionally symmetric layers of material of consecutively increasing or decreasing acoustic impedance laminated about a center layer. The structure may be made by combining several materials, as in consecutive layers of aluminum, plastic, and a rigid foam surrounding on both sides a layer of steel; or, two materials, as in a center layer of Kevlar.TM. surrounded on both faces with layers of plastic. The plies comprising the layer of Kevlar.TM. are canted with respect to the plastic layers.

Abstract: A segmented rocket motor case includes wedge members for forcing the case segments into position to remove free play at the joint thereof which may otherwise interfere with or upset the missile's guidance system and throw it off target. A lap joint member for such a joint includes a shoulder having a surface for attachment of a membrane seal assembly for a pulsed rocket motor. A through bulkhead initiator communicates from the forward segment via a fitting which extends through the membrane seal assembly with an igniter for the propellant grain within the aft segment to eliminate the necessity of running explosive transfer lines along the outside of the case from a safe and arm device and other controls at the head end of the rocket motor.

Abstract: A subcaliber projectile intended for arrow stabilization has its guide assembly set so that the projectile spins around its longitudinal axis and is constructed so that it is unbalanced with respect to its longitudinal axis such that the spinning reaches a critical number of revolutions at a given time during the trajectory of the projectile and the resulting resonance causes destruction of the projectile.

Abstract: An underwater sonar transducer includes a centrally located beam with a plurality of stacks of piezoelectric transducer elements extending from each side, with a rigid end beam at the opposite end of each stack. A plurality of bolts extending from one end beam to the other on opposite sides of the stacks are tightened to apply a desired amount of prestress on the ceramic stacks. Arcuate radiating elements are welded to opposite sides of each end beam, end cap members are fastened to the centrally located beam at each end of the transducer and a jacket of elastomeric material is bonded to the edges of the end cap members to prevent ingress of fluid into the piezoelectric elements. Energizing of the piezoelectric elements causes expansion and contraction of the stacks, pushing the end beams in and out and causing bowing of the radiating elements to project sonar energy.

Abstract: A high velocity aerodynamic body, particularly a shell flying at supersonic velocity, having a device for stabilizing the aerodynamic body and for reducing its oscillation. The aerodynamic body has in the vicinity of its tip, a rotation symmetrical tip enclosure which is supported, with balanced mass, about a support point located on the longitudinal axis of the aerodynamic body, freely tiltably on all sides.

Abstract: A double set trigger for a rifle is disclosed, consisting of a sear, a middle lever, a firing trigger, a set trigger, a catch for the set trigger, and a lever to sense the presence of the rifle bolt. The double set trigger has two springs, one for a light pull and one for a heavy pull. The force from the heavy pull spring is applied through the set trigger. The catch withholds the set trigger from the firing trigger for a light pull; the catch may be released by a second pull on the set trigger. The bolt sensing lever will release the set trigger if the bolt is withdrawn. A counterweight locates the center of gravity of the firing trigger concentric with the pivot point of the firing trigger.

Abstract: A safety mechanism for projectile weapons includes a stop means mounted to prevent the movement of the trigger and/or hammer to a position enabling the weapon to be fired. The stop means includes a generally cylindrical pin having one end extending through a wall of the weapon and the internal body under spring pressure biasing the pin to a first safety "on" position. A cam lobe is formed on the body of the internal portion and engages a portion of the trigger and/or hammer to prevent movement of the trigger and/or hammer from the disabled position. A radially extending key formed on the pin engages a slot in the wall of the weapon to prevent the pin from being rotated about its longitudinal axis. In order to disengage the safety, pressure is applied to the pin to move it to a second position along a path parallel to the longitudinal axis of the pin whereby the key is moved out of the slot to permit rotation of the pin about its longitudinal axis.

Abstract: A running time display for a projectile time fuze uses a digital display visible through a transparent window in a nose of the projectile. The fuze running time can be programmed either electrically by a receiving coil within the nose or manually by a time setting ring on the surface of the nose. To facilitate a running time display during adverse visibility conditions, the display may comprise LED elements with the display elements being intermittently energized to reduce electrical power consumption from a battery powering the time fuze.

Abstract: The invention is an adjustable cheek rest for a hand-held weapon, mounted a stock support tube. Specifically, the invention comprises two adjustable tubes with eccentric bores, mounted about the stock support tube so that the stock support tube fits the bore of the inner adjustable tube and the inner adjustable tube fits the bore of the outer adjustable tube. The outer tube functions as the cheek rest. Each adjustable tube may be rotated about its eccentric bore and reversibly locked so as to vary the position of the cheek rest relative to the line of sight.