Abstract: A support grid for laterally maintaining the relative position of elongated fuel elements within a fuel assembly for use within a core of a nuclear reactor. The grid is formed in the shape of a lattice with the intersecting lattice members defining a plurality of cells, most of which respectively support the nuclear fuel elements. The remaining cells support nuclear control rod guide tubes and instrumentation thimbles. The cells supporting the nuclear fuel elements are provided with diagonally positioned springs on two, adjacent walls. The springs support the fuel elements against dimples which protrude from the opposite cell walls. The adjacent, diagonal springs in each fuel element cell are inclined in opposite directions. The walls of the cells supporting the control rod guide tubes are embossed along their height at the locations intermediate the intersection between adjoining walls with a concave notch having a curvature which conforms to the outside surface curvature of the control rod guide tubes.

Abstract: The invention is a pry-proof gun port for shielding a gun whenever the gun port is in a closed position and for permitting the gun to be discharged through the gun port whenever the gun port is in an open position. The gun port includes a frame mountable to a support structure such as a currency transport vehicle, the frame including an exterior mount plate that defines a discharge port dimensioned to support a closure shield. A push rod has an exterior end secured to a peripheral region of the closure shield and an intermediate portion passing through a chamber of the frame. The push rod moves axially to position the closure shield out of the discharge port, and the push rod then rotates the closure shield away from the discharge port to place the gun port in the open position. A lock rod interacts between a shoulder of the chamber of the frame and a lock shaft coaxial with and within the push rod to restrict opening of the closure shield from the exterior mount plate.

Abstract: A method for aligning adjustable sights on a firearm with the point of bullet impact at a given range in which the sights are aligned during firing range testing including the use of a laser beam unit mounted on the firearm sights which beam indicates the alignment of the sights vis-a-vis the target.