Abstract: A drill hole (350) extends into rock to be blasted. A blasting accessory (310) includes a container portion (312) for holding a predetermined volume of stemming material, and a spacer (330) for spacing the stemming material a predetermined distance from a surface, e.g. a blind bottom of the drill hole. The container portion has a top (320) surrounded by a dilatable, inverted skirt forming a seal (342), and forms a support for a blasting substance like an explosive.

Abstract: A gas powered toy gun comprises a gas supplying portion from which a gas leading passage extends, a valve for controlling the gas leading passage to be open and closed selectively, a slider provided to be movable to a barrel portion connected with a bullet holding chamber and provided with a pressure receiving portion for moving backward in order to supply the bullet holding chamber with a sham bullet, a movable member having an inner space formed therein and provided to be movable in the slider so as to be put selectively in a first state wherein the inner space is coupled with the gas leading passage and in a second state wherein the inner space is removed from the gas leading passage for guiding gas flowing through the gas leading passage to the bullet holding chamber through the inner space so that the sham bullet put in the bullet holding chamber is shot with pressure of gas acting thereon and for guiding further the gas flowing through the gas leading passage to the pressure receiving portion through th

Abstract: A method for manufacturing double barrel shotgun barrels, including the steps of providing an elongated metal stock material having a first end and a second end, forming two index holes in both the first end and the second end of the material, forming a first and second bore hole through the material, and then profiling the material into a desired gun barrel profile. 16. 479 Double barrel shotgun barrels formed from a single piece of elongated solid metal stock material according to the process of the invention are also taught.

Abstract: A valve, possibly for use in a paintball marker, has a longer threaded portion that insures a canister that engages the valve must undergo many twists to become unscrewed from the valve. Alternatively, the valve has an elongated threaded portion with gas bleed channels that extend along a substantial portion of the threading. Still alternatively, the valve may use visual markings along the length of the threaded portion to indicate to a user that the canister is being unscrewed.

Abstract: A reactive munition uses a housing made from a housing in a state that is three-dimensionally rigid. The housing can be made of metal, such as aluminum. A reactive filler, such as powdered polytetrafluoroethylene (PTFE), fills the one or more cavities in the aluminum housing. A jacket encases the housing filled with the reactive filler.

Abstract: A hand-mountable apparatus for collecting spent bullet casings ejected from a firearm. The apparatus comprises a hand-engaging member for engaging a hand of a user, and a spent casing collection apparatus for catching ejected casings and attached to the hand-engaging member.

Abstract: A projectile reconfigures in flight from a launch configuration, in which the center of gravity is aft of the center of pressure, to a flight configuration, in which the center of gravity is forward of the center of pressure. The projectile includes a forward portion and an aft portion, and the reconfiguration involves movement of at least part of one of the portions relative to the other portion. The projectile may have an overall substantially conical shape when in the launch configuration. The forward portion may include a substantially conical nose, and a cylindrical central body attached to the nose. In the launch configuration, at least part of the central body may be located within a hollow in a base of the aft portion. The base may be slidable relative to the central body.

Abstract: A recoil reduction mechanism for a gun includes two successive springs cooperating with a cylinder, an axle and a magnet. The magnet attracts the gun's slide and the cylinder, in a direction opposite of the slide's and the cylinder's recoil direction. A third spring, because of its position and size, acts as an extra suspension for the gun's recoil, and as an accelerator for the slide's reciprocating motion.

Abstract: For a trigger safety device 100 for firearms comprising a trigger 110 which is adapted for rotary reciprocation about a fulcrum 111 and whose free end is protected by a trigger guard 120, accidental firing is prevented in that a safety slide 130 is mounted on the trigger guard 120 for reciprocal displacement between a first end position 122 and a second end position 123 such that said trigger 110 is freely pivotal in a first end position 122 of the safety slide 130 and is blocked in a second end position 123 of the safety slide 130 respectively.

Abstract: A propulsion system for miniature vehicles, such as model airplanes, having multiple direct-current motors arranged radially about a central axis of the propulsion system that drive a propeller system.

Abstract: A wireless-controlled airplane includes a flying unit and an on-ground controller which is connected to the flying unit through a communication section and flies the flying unit. The flying unit includes a body, a drive section installed on the body, a propulsion apparatus which generates a propulsive force when driven by the drive section, a main wing including a plurality of wing elements which are installed so as to be able to move with respect to each other, an opening and closing mechanism which changes the relative positions of the wing elements to change the effective area of the main wing, and a dropping apparatus which selectively holds and drops a load. By changing the effective area of the main wing, the flight speed can be changed, so the capacity and size of the drive section for rotating the propulsion apparatus can be decreased.

Abstract: An automatic, rapid-firing toy gun is powered by a fast moving air stream. The toy gun is simple in design and does not require a lot of effort and time to fire the projectiles or to load the projectiles between firing. The toy gun includes a barrel, a fan, a loading chamber, and a trigger. The barrel has a forward end, a rear end, and an inner passage between the two ends. The fan is arranged with respect to the barrel to direct an air stream through the inner passage from the rear end to the forward end. The loading chamber is mounted on the barrel and has an opening directed into the inner passage. The loading chamber is sized and shaped to hold a plurality of projectiles and the opening is sized and shaped to sequentially release the plurality of projectiles into the inner passage of the barrel one at a time. The trigger is electrically connected to the fan.

Abstract: A method and an arrangement for discharging countermeasures from a carrier craft in the form of an aircraft or equivalent. The countermeasures are intended to be spread initially in the form of unit packs that, after they have left the carrier craft, are to screen the same from missiles approaching is guided by built-in sensors, or other threats. It is especially characteristic of the invention that the unit countermeasure packs are spread from the carrier transversely to the lying direction of the carrier craft.

Abstract: A pistol with a firing pin includes a firing pin safety provided in the breech part. To afford a firing pin safety that is as simple and operationally safe as possible, a resilient tongue attached on an external side face of the breech part is provided, which resilient tongue forms a hook extending into the interior of the breech part, which hook comes to lie in front of a shoulder provided on the striker when the latter is in its cocked position, and the resilient tongue has a downwardly projecting web which cooperates with the trigger arm. The resilient tongue is integrally formed with an ejector spring.

Abstract: A rapid-fire weapon has a barrel with a projectile insertable into the barrel, which comprises several sub-projectiles disposed one behind the other in the longitudinal direction of the barrel and supporting each other. A propellant charge and an ignition means are provided behind each sub-projectile for the sequential ignition of the propellant charges so that the sub-projectiles are successively ejected from the barrel. The sub-projectiles (4) are firmly connected with each other in the area of the propellant charges (6, 6?) in each case by means of a mechanical connection and the connections have in each case at least one rated break point (7, 7?) which is broken in a defined fashion after the ignition of the respective propellant by the pressure of the propellant gases.

Abstract: A method for wirelessly transmitting data to a control unit, such as a blasting machine, selected from a plurality of control units from an operating device selected from a plurality of operating devices, and a system intended for the method. The control unit is connected to a plurality of detonators, which are controlled by the control unit via an electrical wire or a fuse. The operating device is associated with the appropriate control unit in a step in which address data and/or encryption data is exchanged between the units. Only one operating device can be associated with a pre-determined control unit at any given moment. The data transmitted in accordance with the method preferably comprises at least a fire command, which instructs the control unit to fire the detonators.

Abstract: A roof-mounted sensor includes two rows of intersecting electrodes that are placed across an area of the vehicle's roof and a method to determine the position and motion of an occupant. This is accomplished by measuring physical values, which depend on the distance between the highest point of an occupant's body to each electrode in the row. Analysis of the physical values is used to derive an occupant's position relative to each row and the distance between the highest point of an occupant's body and the vehicle's roof. By analyzing the change in distances with respect to time, the occupant's motion can be tracked.

Abstract: An improved armored plating system having a series of elongate tubes arranged in parallel fashion to form a protective array. Each tube has a rectilinear cross section with slanted sidewalls so that each tube partially overlaps the following tube and is partially overlapped by the previous tube. As such, the protective array may be placed on a curved surface while having no gaps in protection. The protective array is formed as alternating tubes slide past one another from opposing directions. A series of laminated members and an embossed member are slideably inserted into each tube and layered upon one another.

Abstract: Glucosamine suitable for human or animal consumption is disclosed. The glucosamine is derived from microbial biomass containing chitin. Suitable starting materials include substantially uniform microbial fungal sources, such as fungal sources derived from Aspergillus sp., Penicillium sp., Mucor sp. and combinations thereof. Methods of producing glucosamine by acid hydrolysis of fermented fungal biomass are also disclosed.