Abstract: Particles adhering to the internal surfaces of an object are removed by conveying an explosive gas or gas mixture to the chamber defined by the surfaces, and detonating the gas or mixture. The detonation loosens the adhering particles, which are then removed from the chamber. The invention has particular application to the removal of particles from the internal surfaces of a body having a plurality of outlets communicating with the chamber.

Abstract: The invention relates to a hose feeding winch intended for use in charging drill-holes with pulverulent or pumpable explosives through a hose inserted into each individual drill-hole. The winch comprises a drum rotatable about a central shaft, a drum cage enclosing said drum and rotatable about said central shaft, and a cradle supporting the central shaft and rotatable about a central axis on the platform of the truck. The drum has means forming a channel or path for the charging hose to be wound and unwound thereon in a single layer, and without displacement by sliding movement in radial or peripheral direction on the surface of the drum.

Abstract: A stained explosive composition in a water-gelatin base is made from oxidizing salts and at least one water-insoluble hydrocarbon which has dissolved therein a water-insoluble coloring material.

Abstract: The apparatus includes two clamping devices mounted for vertical reciprocation one above the other, and having registering central apertures through which a flexible tube is adapted to be advanced. Each clamp contains a flexible sleeve disposed to surround the tube and selectively to be pressed into gripping engagement with it by means of a fluid pressure medium. This medium is also used to reciprocate the clamps alternately toward and away from each other, with only one clamp at a time being actuated so that the tube is advanced (e.g. fed upwardly) first by one and the other of the clamps.

Abstract: A tubular fuse, which is supplied with an explosive gas, is formed so that as the explosive gas is detonated a turbulence will be created to aid in the propogation and continuance of the detonation. To achieve this turbulence, the inner circumferential surface of the tubular fuse is roughened at least along a portion of the length of the fuse. Alternatively, turbulence may be created by coating the inner circumferential surface of the fuse with a fine-grained powder.

Abstract: A detonator is positioned in the bore of, or adjacent to, a roll or coil of detonating cord, one end of which is attached to the detonator, which in turn is aligned with a shothole and with a flexible, tubular inserting device, which advances over one end of the detonator and forces it into the shothole, during which operation the cord unwinds and is drawn into the shothole at the outside of the tubular inserter. In one embodiment cylindrically-shaped coils of cord containing the detonators are fed, as needed, through a supply tube to a receptacle positioned in front of the shothole and in front of the forward end of the inserter. In another embodiment both primer caps and detonators, with cord attached, are rotatably indexible into registry with the inserting tube and a shothole.

Abstract: This invention relates to a method of charging drill holes for blasting, according to which method solid and liquid components of an explosive substantially each of them separately but simultaneously are blown or pumped, respectively, through its individual hose channel into the drill hole within which the components are intermixed as a result of the simultaneous pumping and blowing operations. The invention relates also to various recipes for preparation of explosives possessing properties especially fitted for the method in consideration. The invention also comprises an apparatus suited for carrying out the method.