Cartridge shell and cartridge for blast holes and method of use

F - Mech Eng,Light,Heat,Weapons – 42 – B

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F42B 3/04 (2006.01) E21C 37/14 (2006.01) F42B 3/00 (2006.01) F42B 3/22 (2006.01) F42D 1/08 (2006.01) F42D 1/12 (2006.01) F42D 3/04 (2006.01)

Patent

CA 2439414

Cartridge (10c) comprises body (12) defining a volume for holding energetic material. Body (12) has a first end (16) located adjacenta toe (48) of hole (46) formed in hard material (47), and a second end (18) directed towards collar (50) of hole (46). End (18) is tapered to form a point or wedge-like member. Stemming material (52) is placed in hole (46) to a level below free face (54) of hard material (47) and mechanically held in place by stemming bar (56). When the energetic material is initiated, gas pressure forces cartridge (10c) towards collar (50). As this occurs, the point acts to increase the radial compressive force on stemming material (52) in the annular region between end (18) and the adjacent portion of hole (46). This increases the sealing effect of stemming material (52) and maintains constant the volume in hole (46) within which the gas operates.

Cartouche (10c) composée d'un corps (12) définissant un volume servant à contenir un matériau explosif. Ce corps (12) possède une première extrémité (16) contiguë au fond (48) du trou (46) creusé dans un matériau dur (47), et une deuxième extrémité (18) dirigée vers le pourtour (50) de l'ouverture du trou (46). L'extrémité (18) se rétrécit de manière à présenter une forme pointue ou conique. Un matériau de bourrage (52) est placé dans le trou (46) à un niveau situé au-dessous de la face découverte (54) du matériau dur (47), et est maintenu en place sous l'effet mécanique exercé par une tige de bourrage (56). A la mise à feu du matériau explosif, la pression du gaz pousse la cartouche (10c) vers le pourtour (50). La pointe joue un rôle simultané d'augmentation de la force de compression radiale sur le matériau de bourrage (52) dans la zone annulaire située entre l'extrémité (18) et la partie contiguë du trou (46). Ceci permet d'augmenter l'effet d'obturation du matériau de bourrage (52) et de conserver la constance du volume du trou (46) dans lequel le gaz exerce son action.

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