US1738920A - Blasting cartridge - Google Patents

Description

Dec. 10, 1929. E. ORMSBY BLASTING CARTRIDGE Filed July 5, 1927 Fig-1-,

Patented Dec. 10, 1929 UmrE -n s'rares PATENT oFFIcE ERLE OBMSIBY, OF ST. LOUIS, MISSOURI, ASSIGNOR, BY DIRECT AND MESNE ASSIGN- MENTS, TO CENTRAL MINE EQUIPMENT COMPANY, OF 5'1. LOUIS, MISSOURI, A

conromrrox or mrssounr BLASTING CARTRIDGE Application filed July 5, 1927. Serial No.'203,420.

This invention relates to blasting cartridges for use in mining operations.

Heretofore explosives in mines were permitted to exert their forces in all directions, no provision being made to direct the forces of the explosion in the desired directions or to prevent the forces from striking against the walls of the mine tunnels. This required the use of an excessive amount of explosives to provide for the waste of energy.

An object of the present invention is to provide cartridges for use in mines to control and direct the forces of explosion in the desired directions and to prevent such forces from striking against the walls of the mine tunnels. Thus a smaller amount of explosives is necessary than is required where the energy is wasted because of absence of control of the explosive forces.

Another object of the invention is to provide a blasting cartridge that will not be broken .or shattered by the forces of explosion, but which is provided with openings arranged in proper formation to direct the forces of explosion to fracture the minerals at the ends of tunnels, and elsewhere, so that the minerals may be removed; and to accomplish these results without destroying appreciable quantities of the minerals.

An additional object of the invention is to provide a number of such cartridges, some of which are formed for directing the forces of. explosion properly at the upper or lower corners of the tunnels so as to fracture the mineral along lines in continuation of the tunnel walls without directing the forces of explosion toward the walls, but by directin the forces so as to effect separation or frac- Figs. 3 and 4 are cross sectional views on the lines 3-3 and 4-4 respectively, of Fig. 1.

Fig. 5 is a side elevation of an intermediate one end by an integral wall 2 and having its opposite end open and designed to receive a core 3 connected with an ignition device l. This corner cartridge is formed with a longitudinal series of holes 5 and an additional longitudinal series of holes 6. These two series of holes direct the forces of explosion at an angle of 90 from each other so that when the cartridge is embedded in the mineral at the end of a tunnel, the series of holes 5, for instance, will direct the forces of explosion horizontally in continuation of the plane of the roof or floor of the tunnel, and the series of holes 6 will direct the forces of explosion vertically in continuation of the plane of one of the side walls of the tunnel. The cartridge may be used at any corner of the tunnel, so that either series of holes will direct the forces of explosion vertically or horizontally.

This cartridge is provided, near its inner end, with an opening or slot 7 extending for about 90 of the circumference of the cartridge, so that an explosive blast will be directed'in a sheet near theilmer end of the cartridge to fracture a quantity of mineral vertically from the remaining natural mineral.

The cartridge shown in Figs. 5 to 8, inclusive, is designed and adapted for use between a pair of corner cartridges of the type just described. This intermediate cartridge com-- prises a shell 8 having two diametrically opposite longitudinal series of holes 9 for directing the force of explosion laterally in opposite directions approximately parallel with the roof or floor of the mine tunnel. The cartridge has an inner end wall 10 and a slot 11 extending about 180, which is from the plane of one series of holes 9 to the other series of holes 9. A core 12 is insertable in and removable from the open end of the cartridge and supports the ignition device 13.

In using these cartridges one of the corner cartridges I filled with an explosive is placed in a drilled hole extending longitudinally in the mineral near each upper or lower corner of the tunnel with the ignition device toward the outer end of the cartridge. This outer portion of the hole is then stemmed and tamped' until the hole is filled to cause the forces of explosion to pass through the directing holes. The cartridge is so placed that a series of holes 5 or series of holes 6 opens vertically while the slot 7 extends from the plane of one series of holes to the plane of the other series of holes to direct a blast of the explosive force in a vertical segmental plane.

One or more of the intermediate cartridges 8, filled with explosive, are similarly placed in holes in the mineral between the corner cartridges near the roof or floor of the tunnel in a position in which the two series of diametrically opposite holes 9 open horizontally laterally and in which the slot 11 opens vertically if the cartridge is near the roof, or upwardly if the cartridge is near the floor of the tunnel.

The cartridges are then exploded, with the" result that vertical lines of fracture are produced along the side walls, and a horizontal line of fracture is produced along the roof or floor without damaging the face or body of mineral beyond the planes of the tunnel walls in any direction. Due to the construction of are not damaged but may be used over and over again .to prevent damaging either the roof, the floor, or the sides of the tunnels, which damage is an undesirable and costly result under present practice. Be-

ing of metallic construction the use of these cartridges eliminates the necessity of using paper cartridges, and the possibility of the paper shell becoming swollen which interferes with the insertion of the paper shell into the drill hole for use. No skilled labor is required.

What I claim and desire to secure by Letters Patent is I A 1. A corner blasting cartridge comprising a hollow metallic cartridge shell closed at one end and having two longitudinal series of holes through the wall thereof, each series of holes being at an angle of about ninety degrees from the other series, and said cartridge having a slot near its closed end. extending about ninety degrees around the circumference from the plane of one series of said holes to the plane of the other series of said holes.

2. A corner blasting cartridge comprising a hollow metallic cartridge shell closed at one .ferential len end and havin two longitudinal series of holes through tfie wall thereof, each series of holes being at an angle of about ninety degrees. from the other series, and said cartridge having a slot near its closed end extending about ninety degrees around the circumference from the plane of. one series of said holes to the plane of the other series of said holes, a removable core closing the opposite end of the cartridge shell, and an ignition device in connection with said core.

3. A' blasting cartridge comprising a ho1- low metallic shell having afslot near one end extending about'ninety degrees around the circumference.

4. A blasting cartrid e comprising a hollow metallic cartridge s ell closed at one end and having a slot near said closed end extendlow metallic cartridge shell having aslot near one end of considerable greater circumgth than its Width.

6. A blasting cartridge comprising a hollow metallic shell having a lateral circumferentially elongated opening near one end, and a wall extending from the side of the shell oppositefrom said opening at an angle with respect to the axis of the shell for deflecting the explosive forces laterally through said opening. I

7. A blasting cartridge comprising ahollow metallic cartridge shell having a wall at one end intersecting the plane of the axis of the. shell, said shell having a lateral circumferentially elongated opening through which the explosive forces are directed by said wall.

ERLE ORMSBY.

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