US1157270A - Blasting-cartridge. - Google Patents

Description

W. WEBER.

BLASTING CARTRIDGE.

APPLICATION man JULY 8.1915.

Patented Oct. 19, 1915.

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F1 .2. Sedan Q5 To all whom it may concern:

' UNITED STATES PATENT OFFICE.

WILHELM -WEBERQOF HAYINGEN', GERMANY.

BLASTING-CARTRIDGE.

Be it known that I, WILHELM Wrens, a

7 subject of-the German Emperor, residing at Hayingen, Lorraine, Germany, have invented new and useful Improvements in Blasting-Cartridges, of which the following is a specificatio 'This invention relates to blasting cartridges consisting of combustible metallic powder, an absorptive substance for liquid air, and a primer. Blasting cartridges ignitible by means of primers and consisting of a combustible metallic powder and an absorbent for liquid air are known. However, in such blasting cartridges the absorbent consists of an inert substance, and the combustible metallic powexplosive efiect have not fulfilled the exbustible metallic powder is separated from the absorbent and is provided in compare tively small quantities amounting to about or less of the entire contents of the cartridge, for instance, 50 grams for a car, tridge of a capacity of one cubic decimeter.

In the accompany g drawings an mbodiment of a blasting cartridge according to this'invention is shown, igure 1 representing a sectional elevation and Fig. 2 a cross sectional plan view. a I

This novel explosive cartridge consists of an outer case a preferably double walled with an intermediate layer e of corrugated paper, the intervals of which may receive liquid air; of a perforated tube 6 of a coma detachable cap f at the lower end that en- Specification of Letters Patent. 7

.not produce the desired efi'e'ct.

Patented Oct. 19, 1915.

, Application filed July 8, 1915. Serial No. 38,692.

ables the cartridge tobe filled with a noninert absorptive body 01, and the bag 0 coir.

taining a small proportion of aluminium powder. On the exterior of'the cartridge small channels it for the reception of the priming wires 19 are provided which may be covered by sheet of paper 2' to prevent inj uring the wires while the cartridge is being inserted into the blasting hole.

The absorbent is first inserted into the cartridge whereafter the bag 0 containing the combustible metallic powder and the primer is added. The bag a may be provided with a prolongation e filled with cotton or the like to prevent a rapid evaporation of the liquid' air in contact with the aluminium powder.

As suitable substances of high absorptive power being capable to receive a comparatively large quantity of liquid air and to keep same during a longer period of time, substances may be chosen which are combustible, porous, light in weight, and non-con-,

ductive forheat like cotton, sawdust, cork, linen and the like. These substances are capable to absorb liquid air to an amount equal to a multiple of their weight and will keep a relevant-portionof this quantity for 15 to 20 minutes time which fact may be ascertained by weighing. The high absorptive power of these substances is of great importance since when these substances are employed there remains a margin of liquid air over the quantity of oxygen required for the combustion which margin through evaporation produces dynamic actions besides other phenomena. v

By placing the metallic powder in a bag or smaller cartridge which also contains the primer, a separation of the metal from the absorbent is obtained. This separation of the metallic powder from the absorbent which is .a specialfeature ofthis invention is a requisite because the metallic powder in mixture with the organic substance would Instead of the metallic powder a mixture of several combustible metallic substances may be used,

and the organic matter may be substituted by charcoal which is a heat product of organic substances. Through using but small quantities of metallic powder it is made possible to produce a cheap explosive such as is 'oi' 'sjeefcia'l value'in mining work.

The cartridge is saturated in a most simple manner by'pouring the liquid air contained transportable vessel, into the tube proectmg from the cartridge; or by dipping the cartridge into liquid air. The absorptive body is saturated with liquid air through the perforated tube from below upward; the complete saturation may be ascertained by touching the intensely'refrigerating cartridge with the hand. The cartridge being saturated and the perforated stopper 9 inserted into the end of the tube 6, r

gg charge of a high explosive power such as described in this application, the tamping need only be small. Small holes may be made in the-tamping by means of a skewer to provide for the escape of the yapors. The setting of the shots is carried out from a safe position through electrical ignition, or by means of a fuse connected to the primer.

Owing to the particular nature of the absorbent and owing to the arrangement of the metallic powder separate from the absorbent, the degree ofsaturation is maintained for some time after the blast hole has been tamped. .On the other hand, a partial premature evaporation of the nitrogen enriches the li uid' air in oxygen, thus the cartridge may e shot some minutes after the miners have gone to a safe place, a high explosion effect will nevertheless be obtained.

In some cases Where the blasting hole is provided with a chamber like enlargement the explosive may be applied without a special cartridge but the parts placed separately, by pouring in the liquid air through a tube consisting of a substance non-conductive for heat; even the tampmg may with good results be dispensed with then.

This novel blasting cartridge produces a triple effect: 1. A chemical effect caused by the sudden combustion of the metallic powder in liquid air enriched in oxygen, which combustion results from the electrical ignition. 2. A further chemical effect caused by the sudden oxidation of the absorbent soaked with liquid air. 3. A dynamical effect caused by the sudden evaporation of the excess ofliquid air. The excess of air rich in oxygen prevents the formation of carbonic oxid gas during the oxidation of the absorbent.

Tests carried out with the novel explosive in cylinders of lead measuring 200 milli meters in diameter and 250 millimeters in length and having an inner channel for. the reception of the explosive charge, disclosed surprising results. While blasting cartridges with liquid air of known composition produce a bulging of the leaden sylin der measuring but 2000 cubic centimeters, and with application of dynamite a bulging of 10000 cubic centimeters, the action of the novel explosive is so powerful as to produce with a single shot 21 tons of ore could be got i in. In another gallery, an opening shot was set in a depth of-1 .2 meters; the result produced by the novel blasting cartridge was such that' a mass of ore was thrown off that measured 1 meter in depth, 2 meters in width, and 2.1 meters in height. In both cases cartridges had been employed having a capacity of 1000 cubic centimeters and containing but 50 grams of aluminium powder filled in bags and placedseparately from the saw dust used as absorbent for tire liquid air. The employment of but small quantities of aluminium powder reduces the costs of the cartridge considerably in comparison with other explosives producing an identical effect.

To ascertain the degree of safety in manipulating the novel blasting cartridge the following tests have been carried out: 1. The flame of an acetylene lam could be extinguished by pouring liquid air upon the flame. 2. An ignited match extin ished in contact with liquid air. 3. A nished saturated cartridge was held for 10 minutes time in contact with the fiame'of an acetylene lamp; no explosion occurred. 4. ,A weight of 20 kilograms was allowed to drop from a height of 1.5 meters upon the cartridge placed vertically but having its lower part containing the primer protected; no explosion of the cartrid e occurred.

Having thus describe myinvention, what I claim is:

1. A blasting cartridge, consisting of an outer casing, an organic non-inert absorbent for liquid air within said casing, a perforated storage tube for liquid air surrounded by said absorbent, a separate package of metallic powder inside said casing, and a primer in contact with said metall'icpowder, substantially as and for the purpose described.

2. A blasting cartridge, consisting of a. double walled outer casing, a corru ated leyer'of paper intermediate of the we is of Ill said outer casing, an organic non-inert absorbent for. liquid air, a perforated storage tube for liquid air inside said casing and surrounded by said absorbent, a separate package of metallic powder inside said casing, and a primer in contact With said metallic powder, substantially as and for the purpose described. I

3. A blasting cartridge, consisting of a double walled outer casing, a corrugated layer of paper intermediate of the walls of said outer casing, an organic non-inert absorbentfor liquid air within said casing, a perforatedstorage tube for liquid air surrounded by said absorbent and projecting from said outer casing, a perforated stopper forated tube,

with" said metallic for the outer end of said perforated tube, a separate-package of metallic powder inside said casing, and aprimer in contact and for the purposedescribed.

4. A blasting cartridge, consisting of a double walled outer casing, a corrugated layer of paper intermediate of the walls of said outer casing, channels on the exterior of said outer casing adapted to receive priming wires, an organic non-inert absorbent for liquid air, a perforated storage tube for liquid air surrounded by saidabsorbent and projecting from said outer casing, a perforated stopper for the outer end of said pera separate package of metallic powder inside said casing, a primer inside said package in contact with said metallic powder, and a pair of priming wires embedded in said channels and connected to said primer, substantially as and for the purpose described.

5. A blasting cartridge, consisting of an outer casing, an organic non-inert absorbent powder, substantially as for liquid air, a perforated storage tube for hquid air inside said casing and surrounded by said absorbent, a separate package containing metallic powder to the amount of about of the capacity of the cartridge, and a primer in contact with said metallic powder, substantially as and for the purpose described.

6. A blasting cartridge, consisting of an outer casing, an organic non-inert absorbent for liquid air, a perforated storage tube for liquid air inside said casing and surrounded by said absorbent, a separate package of metallic powder inside said casing and a cotton filled extension of said package interposed between saidstorage tube for liquid air and saidmetallic powder, and a primer in contact with said metallic powder.

7. A blasting cartridge, consisting .of a double walled outer casing, a corrugated layer of paper intermediate of the Walls of said outer casing, channels arranged lengthwise on the exterior of said outer casing and adapted to receive priming wires, a paper cover over said channels, a perforated storage tube for liquid airinside said casing and surrounded by said absorbent which storage tube projects from said outer casing. a perforated stopper for the outer end of said perforated inner storage tube, a closed bag inside said outer casing containing metallic powder and a primer inside said metallic powder, and a cotton filled prolongation of said bag separating said metallic powder and said liquid air, and priming wires embedded in said channels and connectedto said primer substantially as and for the purpose as described.

WILHELM WEBER.

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