Abstract: A gun barrel having a rifled-bore section at the breech end thereof and a smooth-bore section at the muzzle end thereof, the sections having a gas tight connection therebetween, the rifled-bore section comprising a first generally tubular body having a longitudinal bore and at least one spiral groove formed in the wall of the bore to a depth of a predetermined dimension, the rifled-bore section having a length corresponding substantially to the peak pressure point for the gun barrel, the smooth-bore section comprising a second generally tubular body having a longitudinal bore coaxial with the longitudinal bore of the rifled-bore section, and the longitudinal bore of the smooth-bore section having a diameter greater than the diameter of the bore of the rifled-bore section and less than the diameter of the spiral rifling groove.

Abstract: A handgun such as a pistol or revolver, with a grip for handling the weapon, to be held by the hand using the gun, and with a second, additional grip connected to the weapon for the second hand supporting the weapon, wherein the second grip (13) is located at the lower end of the first grip (11) of the weapon (12) and projects outwardly to one side from the first grip (11).

Abstract: A firearm (10) adapted for blowback operation has a receiver incorporating a longitudinally reciprocatable bolt assembly (24) having an inertia firing pin (40) which is movable between retracted or recoil and battery positions in the receiver (14). A trigger (68), including a sear (72), is pivotally mounted in the receiver. A hammer (74) is pivotally mounted in the receiver in such a manner that movement of the bolt assembly from the battery position to the recoil position urges the hammer into a cocked position. The hammer includes a first sear abutment (82) to engage the sear on the trigger, a second sear abutment (84) and a stop abutment (86). A disconnector (76) is pivotally mounted on the trigger pin (70). The disconnector includes a hook sear abutment (88) on an intermediate portion which is adapted to engage the second sear abutment on the hammer when the trigger is in a depressed position.

Abstract: A handgun grip arrangement in which both large and small grip panels may be interchangeably accommodated. A grip frame projection substantially smaller than the large grip depends from and forms part of the handgun frame.Pairs of large or pairs of small grip panels are opposingly positioned on opposite sides of the frame projection which grip panels have border engagement surfaces and frame projection engagement areas which surfaces are drawn into engagement and which engagement areas are caused to engage such frame projection by operation of fastener means.

Abstract: A device for use in borehole-seismic measurements at sea whereby seismic energy sources (7) are suspended below the surface (D) and connected to a handling line (2) which is operated by a crane arrangement on a vessel. By suspension of a minimum of two seismic energy sources (7) from a stand (3) at a distance from mutually separated floats (1) rotatably connected on horizontal axes (9) to the stand, seismic energy sources (7) can be placed and maintained at a constant depth below the surface, whereby several seismic sources (7) can be used simultaneously. The stand (3) is equipped in its central area with a guide (4) for the handling line (2), which is divided at the end connected to the respective energy sources' (7) suspension lines (8), which simplifies the positioning of the device.

Abstract: An apparatus and method for generating a shock wave in water comprising a housing capable of containing compressed gas, attachment means fastened to the housing by which the apparatus is oriented in a selected positioned and exhaust means in the housing positioned to release compressed gas in directions other than substantially upward. In a preferred embodiment, a commercially available compressed air gun is modified by blinding off the uppermost exhaust ports.

Abstract: Each hydrophone receiver element is attached in electrical parallel with the series combination of a switching diode and a zener diode so that the physical orientation of the element is the same for each element network. The response element networks then are assembled into a cable section, the element networks constituting a group array. A test circuit applies a relatively high dc voltage input to the cable section. The switching diodes are not rendered conductive for the elements properly connected. Hence, the output is substantially the same as the input. However, if one or more of the elements are reverse connected, the switching diode for that response element is rendered conductive and the output drops to the level of the zener breakdown voltage. Hence, the whole array-connected group can be tested with a single test.

Abstract: A bolt action rifle of simplified, economical and durable construction resembling an assault rifle is disclosed. An elongated action tube connected between a barrel and stock houses and guides the bolt in all positions of the latter. A unified housing member attached to the action tube defines a magazine having communication with the interior of the action tube and a mounting for a simplified firing and safety mechanism involving a minimum number of parts.

Abstract: Explosive separation apparatus in which a LSC is supported by a plurality narrow preform supports which provide intermittent support at predetermined positions to maintain the LSC at the required standoff and perpendicularity to the target. The orientation of the supports themselves is maintained flat against the missile skin by a properly sized tunnel in the backup ring. The supports have a channel which maintains the LSC in the required orientation and standoff. A slot in each support below the liner walls of the LSC eliminates any obstruction from the support between the LSC and the target. The supports are maintained at the required spacing by a wire lanyard system which also allows the support system including the LSC to be installed in or removed fron a backup ring without applying any longitudinal forces to the LSC itself. A Venturi Plate provides a dual target to prevent delamination or splintering when cutting a target of composite material.

Abstract: A pylon (70) on one structure (68) abuts a side surface of a mounting flange (64) carried by another structure (60) and is bonded thereto by an adhesive layer (76). A flattened tube (78) is positioned between pylon (70) and flange (64). Explosive cords (82) are detonated inside tube (78) to expand tube (78) to a rounded configuration. This causes pylon (70) to peel away from flange (64) and to peel adhesive layer (76) to thereby release structures (60,68) from each other. In another embodiment, a structure (4) has a wall (6) including an outer skin (8), an inner skin (10), and a honeycomb core (12). Outer end portions (14,20) of skins (8,10) form two mounting flanges that are bonded by adhesive layers (40,42) to opposite surfaces of a mounting flange (32) carried by another structure (28). Detonation of explosive cords (50) inside two expandable members ( 46,46') causes skin flanges (14,20) to peel away from flange (32) and peel layers (40,42).

Abstract: I provide a combination land/bay cable capable for simultaneous use on land and in water-covered areas. When the cable section is placed in a water-covered area suitable for hydrophone use, a polarized plug containing an impedance matching transformer is detachably connected to a polarized socket. The transformer connects the hydrophones to a transmission line. If the cable is to be used on land, the transformer is unplugged deactivating the hydrophones and at least one geophone having a substantially identical plug is inserted in the socket. The plug connects the geophone to the transmission line and leaves the hydrophones inactive.

Abstract: A firearm is disclosed which includes a gun body having a firing mechanism and a barrel mount movable between a barrel loading position and a firing position. The firing mechanism is maintained in inoperative condition unless the barrel mount is correctly positioned in the firing position. A shoulder stock is releasably mountable on the gun body to permit the firearm to be selectively usable in pistol or rifle form. A plurality of barrel parts are selectively mountable on the gun body and include a first barrel of a length capable of firing baton rounds and gas rounds and a first insert of a similar length adapted to be fitted from only the end adjacent to the barrel mount into the first barrel to provide a smaller caliber barrel. A second barrel of a shorter length than the first barrel is provided and is capable of firing flare rounds.

Abstract: A falling block rifle action which is cocked by the downward movement of the breechblock and which includes a safety mechanism for blocking not only a trigger movement but also the movement of the striker and other interconnecting linkages. An adjustable extractor mechanism coupled to the cocking lever in central relation to the chamber accommodates a wide variety of types and sizes of cartridges.

Abstract: A firearm with a barrel tiltable about a breechblock includes an ejector for throwing out a cartridge or cartridge case. The ejector is prestressed by a spring so as to be movable in discharge direction and cooperates with a locking pin such that in a first stage the movement of the ejector during initial tilting of the barrel is braked and is brought to a standstill while upon further tilting of the barrel, the ejector is accelerated in a second stage to expel the cartridge.

Abstract: A separating arrangement between multipart constructional elements, including an expansion chamber for at least one pyrotechnic charge which is bounded by the piston surface of a displacement or sliding piston. The separating arrangement has at least one gas passageway which communicates with the expansion chamber, through the intermediary of which a separating piston can be subjected to pressure. The combustion gas pressure of the pyrotechnic charges acts within the expansion chamber against different piston surfaces and thereby, in a constructively predeterminable manner, effects different successive piston movements, as a result of which the sequence of the individual separating operations which can be carried out in different directions predeterminably in a definite manner and functionally-dependent.

Abstract: An insert for a weapon barrel for facilitating the firing of a small caliber ammunition comprises a tubular member having a bore defining a distinct caliber with one end having an exterior surface ending in a raised shoulder forming an abutment for a compensating bushing positioned on the exterior surface and abutting the shoulder. A sleeve is positioned on the exterior surface alongside and abutting against the bushing. This end of the insert carries a first locking mechanism for locking the sleeve radially in the barrel. This includes a tapered spreader sleeve which engages with a tapered exterior surface of the sleeve positioned on the insert adjacent the compensating bushing. The spreader sleeve is urged into bearing engagement with the tapered surface of the other sleeve by means of a knot threaded over the insert and advanced toward the spreader sleeve. A safety key is insertable through an opening in the sleeve and it engages in a longitudinal slot formed on the insert.

Abstract: To manufacture tubes having a wear-resistant inside coating, such as gun barrels, hard material layers are deposited on the barrel and the layers are strain-hardened in their surface area by at least the ratio of the area by which the surface area is reduced by compression divided by the surface area of 0.001 (.DELTA.F/F=1.10.sup.-3) or reducing the area of the layer by 0.1%.

Abstract: A grip and folding stock assembly mounted and arranged on a compact gun for facilitating use of the gun in various firing positions. The grip and folding stock assembly is employed with a weapon that generally has an elongated receiver. An L-shaped bracket has one end secured to the distal end of a pistol grip emanating from the undersurface of the receiver, and the other end secured to the undersurface of the rearward end of the receiver. Mounted in this way, the bracket defines a forearm receiving portion for stabilizing the gun while firing. A folding stock is pivotally mounted to the rearward end of the receiver of the weapon. The stock is operative between two extreme positions. In a first position, the stock is folded and brought into close proximity to the pistol grip. In a second position, the stock is placed into a position suitable for shoulder firing.

Abstract: A multi-warhead, anti-armor missile which includes a missile that has a bter section, a sustainer section, guidance and control means, and primary and secondary warhead sections at nose portions of the missile, with said primary warhead being designed for defeating basic armor of an enemy target and said secondary warheads being designed for dispersal into a cluster prior to the missile arriving at the target and arranged for defeating advanced armor explosive positioned around the basic armor.

Abstract: A rocket motor is disclosed which employs a Class 1.1 detonatable composition which is both a propellant and explosive. One grain design is configured to give a high boost acceleration during the burning phase of a perforated portion of the grain. The internally burning grain subsequently changes to an end-burning grain which provides a sustaining thrust burning period. The rocket motor flies to target with the burning surface progressing towards the head end. The rocket burns to target, but the design always provides some remaining propellant which serves as the warhead explosive on impact with the target. Detonator means cause the remaining unburned propellant to denonate at target impact or prior to target impact. This rocket motor design does not provide for separation between the warhead and the motor case. Therefore, the complete rocket motor travels to the target area.