Abstract: A lock ring that has a first ring half, a second ring half and a latch assembly. The first ring half includes a nest opening on a front portion of the first ring half, a back end portion of the first ring portion hingedly connected to a back end portion of the second ring half. The latch assembly is connected to a front portion of the second ring half. The latch assembly includes a connection arrangement and a spring system. The connection arrangement is designed to be releasably positionable in the nest opening. The spring system is designed to cause the front portions of the first and second ring halves to be drawn toward one another when the connection arrangement is positioned in the nest opening.

Abstract: A lock ring that has a first ring half, a second ring half and a latch assembly. The first ring half includes a nest opening on a front portion of the first ring half, a back end portion of the first ring portion hingedly connected to a back end portion of the second ring half. The latch assembly is connected to a front portion of the second ring half. The latch assembly includes a connection arrangement and a spring system. The connection arrangement is designed to be releasably positionable in the nest opening. The spring system is designed to cause the front portions of the first and second ring halves to be drawn toward one another when the connection arrangement is positioned in the nest opening.

Abstract: A lock ring that has a first ring half, a second ring half and a latch assembly. The first ring half includes a nest opening on a front portion of the first ring half, a back end portion of the first ring portion hingedly connected to a back end portion of the second ring half. The latch assembly is connected to a front portion of the second ring half. The latch assembly includes a connection arrangement and a spring system. The connection arrangement is designed to be releasably positionable in the nest opening. The spring system is designed to cause the front portions of the first and second ring halves to be drawn toward one another when the connection arrangement is positioned in the nest opening.

Abstract: A lock ring that has a first ring half, a second ring half and a latch assembly. The first ring half includes a nest opening on a front portion of the first ring half, a back end portion of the first ring portion hingedly connected to a back end portion of the second ring half. The latch assembly is connected to a front portion of the second ring half. The latch assembly includes a connection arrangement and a spring system. The connection arrangement is designed to be releasably positionable in the nest opening. The spring system is designed to cause the front portions of the first and second ring halves to be drawn toward one another when the connection arrangement is positioned in the nest opening.

Abstract: A process, apparatus, and composition are disclosed for forming a molded foamed polyurethane explosive block with pentaerythritol tetranitrate in a manner in which the generation of excessive exothermic heat is inhibited during the reaction to form the foamed polyurethane. In one aspect of the invention, the exothermic heat generation is controlled by the use of non-reactive filler materials. In a preferred embodiment, a monoammonium phosphate filler is used to further impart fire retardant properties to the resultant molded foam explosive block.