Abstract: The invention is directed to an apparatus (concealed safety device) and method for preventing unauthorized or inadvertent discharge of a firearm. The apparatus includes a plurality of annular pistons which are manipulated using a spring and hydraulic assembly. The pistons are attached to a annular engaging ring which works to obstruct the mainspring rod of a firearm when the apparatus is inserted into the associated firearm aperture. In operation, a quick manual pressure or strike to the right side of the gun handle through a concealed, thin-skinned, flexible wall allows for manual deactivation of the lock. When in the correct position the engaging ring blocks movement of the mainspring rod preventing the firearm's trigger from being pulled. The device is capable of installation at the time of manufacture or as an after-market accessory replacing the stock firearm grips.

Abstract: An extended circumference intake poppet valve system for use with a single charge carrying intake duct/port to an engine cylinder in a four cycle internal combustion engine to include three or more annular intake poppet valves (secondary valves), annular valve seats (mini ports), disposed within a primary valve head which spans said single duct/port (valve system), said valve system in fluid communication with said duct and said cylinder for opening and sealing said duct/port at said duct seat, intake valve lifting and closing means, wherein the area of the duct/port, and the matched area of the open valves are substantially equal for an extended optimum charge flow period, and in addition, valve open areas at all valve lift points during the inlet event that occur, initially and throughout extended duration through closure, are enlarged when compared with a single poppet valve servicing the same duct/port, resulting in greatly enhanced charge volume into the cylinder during the intake event.

Abstract: An intake and exhaust valve system deployed in an internal combustion engine that improves available charge flow through the engine, provides improved charge turbulence and swirl of charge during each intake stroke for better mixture, provides for multiple independent fuel mixing at the cylinder, allows the use of concentric intake and exhaust valves also providing for balanced charge entry exit symmetry. The intake and exhaust valve system includes using a plurality of three or more concentric valve assemblies per cylinder, each intake valve being mounted within a hollow exhaust valve, the multiple intake and exhaust valves providing optimum flow area entering and exiting the cylinder. Three or more charge passage openings per cylinder strategically disposed enhances the uniform distribution of charge per unit time. Utilization of the present invention greatly increases the fuel efficiency of the engine, reduces emission pollution without sacrificing engine horsepower.

Abstract: A multiple intake poppet valve array for use with a single charge carrying intake duct to an engine cylinder in a four cycle internal combustion engine to include three or more annular intake poppet valves and annular valve seats (ports) in fluid communication with said duct and said cylinder for opening and sealing said duct, intake valve lifting and closing means, wherein the area of the duct, the total area of the ports, and the area of the open valves are substantially equal for optimum charge flow at a valve lift distance that occurs earlier and that extends duration when compared with a single poppet valve servicing a similar duct.

Abstract: An intake or exhaust valve assembly for use in a four cycle internal combustion engine including a primary poppet valve, said primary poppet valve having at least one aperture disposed through its valve body and a secondary poppet valve body mounted to seal when engaged to the primary valve body, said secondary valve body having at least one aperture and a biasing means for moving the secondary valve body away from the primary valve body during the initial opening process when the primary valve is accelerating to its opened position. In the closed position of an intake port, the primary valve apertures are not aligned with the secondary valve apertures thus forming a sealed closure across the port. During the opening process of the intake cycle the biasing means moves the secondary valve body away from the primary valve body, thereby permitting intake charge to flow through the apertures disposed in the primary and the secondary valve bodies.