Powder charged rock cracker cartridge

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

Patent

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Details

F42B 3/26 (2006.01) F42B 3/02 (2006.01) F42D 1/045 (2006.01)

Patent

CA 2716037

A powder charged rock cracker cartridge (1) comprises asubstantially cylindrical outer sleeve (2) with an end wall in a first end (3); a plug (4) which, enclosing said outer sleeve, is inserted into and is secured in an opposite second end of the outer sleeve; a main chamber (5) in the outer sleeve (2) between said end wall and said plug, which main chamber is filled with a blasting powder charge (6); a substantially cylindrical inner sleeve (7), which is coaxial with the outer sleeve (2), is connected to said plug, and extends into the charge of blasting powder in the main chamber; and a central through hole (8) in said plug which communicates with the inner sleeve, which is closed in its inner end, which is inserted into the blasting powder charge. The hole in the plug and the inner sleeve in combination form a priming chamber (9) having a shape corresponding to the outer shape of a detonator (10), which can be trigged electrically and comprises an igniting powder charge. The inner sleeve has an inner wall (13) consisting of a plastic material. The thickness of the plastic wall and plastic material are selected such that the plastic wall in less than 25 ms (milliseconds) is penetrated by the pressure and the flame of fire which are formed when the detonator is ignited, thereby igniting the blasting powder charge.

Linvention décrite (1) comprend un manchon externe sensiblement cylindrique (2) avec une paroi dextrémité dans une première extrémité (3) ; un culot (4) qui, en enfermant ledit manchon externe, est inséré et fixé dans une seconde extrémité opposée du manchon externe ; une chambre principale (5) dans le manchon externe (2) entre ladite paroi dextrémité et ledit culot, laquelle chambre principale est remplie dune charge de poudre de mine (6) ; un manchon interne sensiblement cylindrique (7), qui est coaxial avec le manchon externe (2), est raccordé audit culot, et sétend dans la charge de poudre de mine dans la chambre principale ; et un trou traversant central (8) dans ledit culot qui communique avec le manchon interne, qui est fermé à son extrémité interne, qui est inséré dans la charge de poudre de mine. Le trou dans le culot et le manchon interne forment en combinaison une chambre damorçage (9) ayant une forme correspondant à la forme externe dun détonateur (10), qui peut être déclenché électriquement et comprend une charge de poudre dallumage. Le manchon interne comporte une paroi interne (13) constituée dune matière plastique. Lépaisseur de la paroi plastique et la matière plastique sont choisies de telle sorte que la paroi plastique soit pénétrée en moins de 25 ms (millisecondes) par la pression et la flamme de feu qui sont formées lorsque le détonateur est allumé, allumant ainsi la charge de poudre de mine.

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