US1863921A - Explosive cartridge - Google Patents

Description

June 21, 932. D. B. MccLouD EXPLOSIVE CARTRIDGE Filed March 2l, 1931 2 Sheets-Sheet June 21, 1932. D. BY MCCLOUD EXPLOSIVE CARTRIDGE Filed March 2l, 1931 2 Sheets-Sheet atented .lune la?? "193i non is. iaccnoun, or :ooe-uom, ILLINOIS i EXPLOSIVE .a 'BRIDGE Application filed March 21, 1931. Serial No. 524,235.

rlhis invention relates to an explosive cartridge, and particularly a cartridge for .explosive purposes in open pit miningand quarryingrfor blasting and loosening surface r rock and earth. An explosive cartridge of the type of the present invention comprises an outer cloth or canvas covering or container filled with' a carbonaceous material such as soot, sawdust, or the like. The outer cloth covering or bag is preferably closed at one end, and after filling with the carbonaceous material, .the open end is tied with metal tie wire, and the cartridge then saturated with M liquid oxygen, making a highly explosive acter is immersed' in the liquid oxygen for saturatiom'it readily absorbs several times its' original weight of the liquid.-

In 'openpit mining operations the blast 20' holes are drilled vertically, and are from four to eight inches in diameter. Water is `used in the process of drilling, and at the time of loading or depositing cartridges in i the blastholes, the walls of the holes are 25 often wet'fr'm top tobottom. In loading a hole with liquid oxygenexplosive cartridges, the firstcartridge is usually .lowered or dropped to thebottom of the hole,.the next1 cartridge is then dropped on top of theV first,

ber' have beenY deposited in the hole, after. which dirt stemming or filling is placed on ,top of the charge. A- fulminate cap is inyserted in one of the lcartridges during the loading operationV for later detonation., t is desirable to have the cartridges of as large diameter as possible so as to obtain the maximum amount of explosive in thelimited load;- ing space afforded in the lower portion of the drill hole. It is also necessary to load liquid oxygen explosive very quickly because when exposed' to ordinary temperatures, the liquid oxygen evaporatesrapidly, causing deterioration of the cartridge. I

45 v An explosivecartridge consisting ofa cloth bag ofthe proper size and shape filled with carbonaceous material has been unsatisfac` tory. and has been the causeof premature eX- plosion's. 'Such cartridges when saturated 5,9 with nquidpxygn become soa-,.eabby, amr

cartridge. When a cartridge of this char-V and this is continued until the required num-` misshapen. When lowered or dropped down the drill hole, they frequently lodge before i reaching the bottom by contact with a slight projection that may exist in the hole, or by reason of the ilabby condition of the cartridge. Upon lodging, the cartridge will freeze tightly to` the wet wall of the hole inasmuch as the temperature of the saturated cartridge is approximately 184 degrees below zero Centigrade, this being the temperature of the liquid oxygen, and the cartridge must then be removed or forced down quickly into the hole. This is a hazardous undertaking, and loss of life has occurred by rodding lodged cartridges in efforts to isengage them. An object is to provide a cartridge of the character stated, having the property of being maintainedqafter saturation in true cylindrical form to facilitate handling and to avoid lodging, and ffwhich is economical to manufacture and highly eficientfor the purose. v p Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed. l

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which: n

Fig. 1 is a perspective view of the coinpletedexplosive cartridge of the present 1nvention; j

Fig. 2is a longitudinal sectional view taken substantially on the line 2-2 of Fig. 1;

Fig. 3 isa sectionalw'iew similar to Flg. 2, `with the carbonaceous material omitted;

Fig. 4 is ,fa transverse sectional view taken substantially .on the line 4 4 of Fig. 2; and

Fig. 5 is ak face view of the perforated lining material employed.

`As illustrated inthe drawings, the prey ferred embodiment of the invention comprises an outer cloth container which is pref erably composed of strong heavy cloth, woven so as to be sufficiently porous to allow saturationn` with liquid oxygen. As shown, this outer container or bag is sewed 1n such manner Athat when filled. or packed, the

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cartridge will assume a cylindrical shape. 'llhe closed end 8 is'preferably conical to facilitate deposit in a blasthole, and after filling, the open end is gathered and tied with tie wires 9, leaving a loose pro] ecting portion l() which is grasped in handling.

A particular feature of the present invention is the employment of a lining material 11 which is preferably bent into cylindrical form and insertedwithin the outer cloth bagL material be sufficiently flexible to permit ofl bending into cylindrical form. y

In general use, strawboard of .025 caliper has proved very satisfactory. ln making the liner,`strawboard is cut into a ysheet having a length equal to the length ofthe cylindrical portion of the cartridge when filled, and al width approximately two inches greater than the circumference .of the lled cartridge.

' The invention is especially adapted for use 1n cartridges ranging from three lto seven and one-half inches in diameter, and prior to insertion of the lining'material, it is perforated with a plurality of holes or openings.A

Straw/board or equivalent material having the stiffness and rigidity stated is not sufliciently porous, and wouldtherefore obstruct saturation with liquid oxygen. To allow for such saturation, the lining material is provided with af'plurality of perforations or openings 12. "These openings or perforations may be round, as shown, square, or any de sired shape, and are preferably disposed approximately two inches apart when providf ing round openings each'three-eighths of an inchin diameter. Smaller openings may be provided with relatively closer spacing when employing a thin cardboard, for example, to avoid weakening the-liner sothat it might rumple or break in service. 1

Consequently, the dimensions given may be varied while using approximately the same proportion between the spacing and the size of the openings. If the perforations are too large, the carbonaceous material of the cartridge may bulge" or extrude through the vopenings, if the/cartridge is tightly'packed,

which would tend to defeat the ,purpose of making a smooth, rigid cartridge to avoid lodging in-a drill hole. Rapidity and lapping the liningmaterial when cylindricaleconomy in manufacture is attained by overreeaeai ly formed and inserted in the cloth container, as shown at 13 in `Fig. 4.

By interposing a lining material of the character stated, which is relatively sti yet sufficiently flexible to be bent into cylindrical shape,.between the outer cloth container and the carbonaceous filler, therey is provided a cartridge that is smooth', rigid, and formed`r to hold a true cylindrical shape after satura- Wil' details of construction asset forth, but`desire to avail myself of such variations and modifications as come within the scope of the appended claims.

What l claim as new and desire to secure by Letters Patent is:

described, adapted to be saturated with liquid ,I

oxygen, comprising an outer cloth container sewed in such manner as to assumea cylindrical shape when filled yor packed, a fillerof carbonaceous material, and a lining material interposed between said containerl and said filler, said lining material composed of chipboard, y strawboard, pulpboard, cardboard, jut'eboard, pressboard, or the like relatively sti in structure, but of sufficient flexibility to be bent-into cylindrical formation for insertion in said container, and also provided with a plurality of perforations for rapid saturation of said filler, said perforations being substantially in the proportion of a two inch spacing between perforations, each of apprximately three-eighths inch diameter.

oxygen, comprising an outer cloth container sewed in such manner as to assume a cylin-` n explosive cartridge of the character described, adapted to be saturated with liquid izo 3. An explosive cartridge of theicharacter jdescribed, adapted to be saturated with liquid oxygen, comprising an outer cloth contalner sewed in such manner as to assume a cylindricalshape when filled or packed, afilller of carbonaceous material, and a lining material interposed between said container and said filler, said lining material composed of straw-- board of substantially twenty-ve-thou sandths caliper, and provided with a plurality of spaced perforations for rapid saturation of said filler, said perforations being substantially in the proportion of a two inch spacing between perforations, each of approximately three-eighths inch diameter.

4. A lining material for an explosive cartridge of the character described, comprising a sheet of strawboard, of substantially twenty-ive-thousandths caliper, and provided with a plurality of spaced perforations substantially in the proportion of a two inch space between perforations` each of approximately three-eighths inch diameter.

5. An explosive cartridge of the character described, adapted to be saturated with liquid oxygen, comprising an outer cloth container sewed in such manner as to assume a cylindrical shape when iilled or packed, a filler of carbonaceous material, and a lining material interposed between said container and said filler. said lining material composed of chipboard, pulpboard, cardboard, juteboard, pressboardstrawboard, or the like, of suficient exibility to be bent for insertion in said container, and also provided with a plurality of perforations for rapid saturation of said filler.

6. An explosive cartridge of the character described, adapted to be saturated with liquid oxygen. comprising an outer cloth container sewed in such manner as to assume a cylinn drical shape when filled or packed, a ller of carbnaceous material, and a lining material interposed between said container and said ller, said lining material composed of chipboard, pulpboard, cardboard, juteboard` pressboard, strawboard, or the like, relatively still in structure, but of suiiicient flexibility to be bent into cylindrical formation for insertion in said container, and also provided with a plurality of perforations for rapid saturation of said filler.

In testimony whereof I have signed my name to this specication.

DON B. MOCLOUD.

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