Abstract: An underwater acoustic transducer for providing high amplitude low frequency acoustic output wherein a plurality of flextensional transducer ovals are formed into a mechanical transformer ring with a corresponding plurality of transducer drivers received therein. A corresponding plurality of radiating surface plates are fixed to the flextensional transducer ovals so as to form a flextensional ring which has disposed on both ends thereof an end plate. Furthermore, a sealing boot is disposed around the flextensional ring which receives the necessary power to operate the transducer drivers so as to vibrate the flextensional transducer ovals to provide the desired motion. Additionally, the flextensional rings can be configured into a tube so as to provide increased levels of acoustic energy.

Abstract: A cartridge magazine for use with a firearm includes a housing arranged to enclose a plurality of cartridges. The housing has an opened end and a mouth for permitting cartridges to be loaded therein and dispensed therefrom. A follower is movably positioned within the housing and biased toward the mouth. At least one movably mounted tongue and an opposing member are associated with the mouth. The movably mounted tongue is constructed and arranged to move between a first normally biased cartridge retaining position wherein a forward-most cartridge is retained in the mouth by the tongue and the opposing member and a second cartridge loading position wherein the movably mounted tongue is moved linearly away from the mouth as a new cartridge is inserted thereinto. The tongue thereafter returns to the first cartridge retaining position.

Abstract: An improvement for retaining sling swivels on a firearm where web or narrow fabric is used in place of cord. Holes in an outer retaining piece and an inner cushioning piece can be of any shape. An extending projection may be used in the holes to conform the web or narrow fabric to the openings in the sling swivel.In another embodiment, a wire may be enclosed in a closed web loop. A tab, which is folded and stitched, is formed adjacent to an outer retaining piece.

Abstract: A zone-defense weapon system includes an attack device having at least one main launch tube having a projectile that encloses an explosive charge. At least one device for surveillance and acquisition of targets controls a surveillance zone by detecting an objective target penetrating into the surveillance zone, and by controlling firing of the main projectile in the direction of the detected objective target. The attack device is located at a remote distance from the surveillance and target-acquisition device, and the surveillance zone is within the action radius of the attack device. The surveillance device may include an auxiliary projectile fired from the attack device.

Abstract: An electro-acoustical transducer arrangement for underwater antennas comprised of a plurality of hydrophones (10) which are arranged at equal distances in a linear array, and are to be disposed vertically above each other on a support. For reasons of a simplified assembly along with good receiving properties, the hydrophones (10), together with a reflector (11) disposed behind them in the direction of incoming sound, are embedded in an acoustically transparent rigid cast enclosure (20) of an elastomer, preferably polyurethane, which can be worked in a casting process. The connecting lines (12) of the hydrophones (10) of the enclosure 20 are combined in a common plug (13), which is accessible on a front end of the rigid cast enclosure (20). The rigid cast enclosure (20) is provided with devices for fastening the enclosure to the support.

Abstract: An anti-missile missile for preventing an incoming threat missile from impacting a target without requiring impact of the anti-missile missile with the incoming threat missile. The incoming threat missile is provided with a guidance and control system disposed for receiving a source of guidance energy from an external source for guiding the threat missile to impact with the target. The anti-missile missile includes a body having a container carried thereby and a shield device carried in the container for ejection from the container in the vicinity of the threat missile. The shield device is disposed for controlling the amount of guidance energy received by the guidance and control system thereby rendering the guidance and control system ineffective to guide the threat missile to the target. An ejection device is provided for ejecting the shield device in the vicinity of the threat missile.

Abstract: A detonator has a transparent polycarbonate tubular casing, with an electric igniter inserted from one end to abut a constriction in the tube. The conflagration charge is deposited onto the igniter from the other tube end, and primary and secondary explosive charges respectively are added from that other end.

Abstract: An expandable ogive is disclosed which incorporates a plurality of sections (20, 22, 24) which move into an extended position. The ogive is locked in the extended position by mating tapered surfaces on the piston sections of an actuator (44) which are tapered at an angle of less than about 2.degree. relative to the center line axis of the missile or rocket. The mating surfaces lock sufficiently tightly to resist the aerodynamic loadings on the ogive during missile or rocket flight and therefore maintain the proper ogive configuration independent of the gas pressure in the actuator (44) which initially moves the ogive sections into the extended position.

Abstract: A portable shooting stand is disclosed in which a modular seat and table assembly rides in a circular fashion on rollers over the top of a ground engaging roller track.

Abstract: A combined handgrip and trigger guard for a firearm has a handgrip section and a trigger guard section. Preferably, the handgrip section and trigger guard section are provided as an integral one-piece polymer member. The trigger guard section extends from the handgrip section in a general cantilevered configuration. A free end of the cantilever trigger guard section has an integral pin section that is located in a hole of a frame of the firearm. Locating the free end of the trigger guard section against the frame with the pin section in the hole of the frame is the only direct connection of the trigger guard section to the frame and does not use additional fasteners directly between the trigger guard section and the frame.

Abstract: A transducer device and method include affixing a preamplifier or other suitable circuit to a thin piezoelectric membrane. The membrane fully supports the circuit at an inactive region of the membrane. The membrane has at least one piezoelectrically active region that is connected to the circuit by a signal line. Preferably, the signal line is fabricated onto the membrane using integrated circuit fabrication techniques. In the preferred embodiment, the piezoelectrically active region has a diameter of less than one hundred microns and the membrane has a thickness of less than ten microns. A potting compound provides structural support of the membrane and insulates the on-membrane circuit.

Abstract: A combustible fin protection device (10) for protecting the fin planforms 01) on a finned projectile (100) wherein the device (10) comprises a cover member (20) fabricated from a combustible material (21) and dimensioned to envelop the fin planform (101) to protect the fin planform (101) from elevated temperatures and propellant grain impacts during the in-bore transit of the projectile.

Abstract: A transducer includes one or more electro-acoustic motors located on a same internal plane or as a peripheral ring of a flexible envelope to which they are interdependent by at least one-of their ends by an assembling device and to which they transmit their vibrations, the flexible envelope being in contact with the liquid and constituting the acoustic waves emitting surface. The flexible envelope is shaped such that the amplitude of the vibrations is increased in a range of very low frequency. The envelope includes at least one orifice allowing the liquid to enter the whole internal cavity delimited by the envelope and a baffle made up of alveolar material that resists the immersion pressure and fills most of the cavity volume. The external surface of the baffle is at a constant distance from that of the interior of the envelope and is interdependent to the assembling device of the acoustic motors.

Abstract: A gun sight assembly including a body to be held against a surface of a gun, a sight carried by the body, an anchoring part received within a dovetail groove in the gun, and a threaded fastener extending through an opening in the body and threadedly connected to the anchoring part and operable to pull the anchoring part toward the body in a manner tightening the anchoring part against converging side walls of the dovetail groove and tightening the body against the surface of the gun.

Abstract: This invention provides a means of providing a continuous signal which corresponds in phase and frequency to a brief instruction signal. The instruction signal is analyzed and the average frequency is determined. The average frequency is used as a basis for synthesis in a direct digital synthesizer or is substituted for the head to tail phase increment in a head to tail repeat synthesizer. The process can be carried out when only a fraction of a cycle is present in the instruction.

Abstract: A geophone is disclosed that has a cylindrical housing closed at one end by a bottom and the other end by a top. A magnet assembly of a rare earth magnet with pole pieces at each end of the magnet is centrally mounted in the housing providing an annular space between the magnet assembly and the housing. A coil form is located in the annular space. Springs support the coil form for axial movement relative to the magnet assembly along the longitudinal axis of the housing. The rare earth magnet produces a magnetic field sufficiently strong that the pole pieces can be made longer than the coils on the coil form thereby provided a uniform magnetic field in which the coils move thereby reducing the amount of harmonic distortion produced by the geophone.

Abstract: In an electroacoustic transducer, the opening portion of a casing body which contains therein a magnetic driving portion for converting an electric signal into a sound is closed by a casing cap to form a resonance space (resonance chamber) which resonates in response to an acoustic vibration generated by the magnetic driving portion, wherein a plurality of slender projections to be entered into said casing body are projected from the casing cap to position said casing cap relative to said casing body. As a result, it is possible to enlarge the capacity of the resonance chamber and improve the assembling accuracy.

Abstract: A recoil buffer for a semi-automatic pistol having conventional, relatively moveable slide and frame with opposing abutment surfaces limiting rearward movement of the slide in response to firing the pistol. The recoil buffer is a layer of firmly resilient material mounted in covering, contacting relation to the frame abutment surface. The layer of material is disclosed in the form of a washer mounted upon a portion of the slide return spring guide rod. In one embodiment, the washer has a through cut to permit its radial insertion over a stem portion extending between flange and head portions, and the recoil buffer may include a second, resilient washer axially inserted on the guide rod to be positioned against the forward surface of the flange, for contact by the slide abutment surface in the rearward position of the slide. In a further embodiment, the washer is axially inserted on a stem extending rearwardly from the guide rod flange.

Abstract: A radar system includes a stabilization calibration arrangement wherein a module stores particular parameters for relating the radar system to a gyro which provides stabilizing data for the radar system. The storage module, the radar system and the gyro are mounted on the same mounting platform so that the particular calibration features remain with the mounting platform. With the arrangement described, the radar system is independent of the gyro and can be of a generic configuration as is advantageous for stabilization calibration purposes.

Abstract: A marine propeller using the circulation control principle of blowing tantially over a Coanda surface at the trailing edge of each blade to develop high blade lift (thrust). Each blade has internal chambers and two blowing slots so that blowing is controllable for forward and for reverse thrust without reversing rotational direction of the propeller. This propeller is capable of generating much greater thrust and ship speed at lower RPM and noise levels than conventional propellers.