US1840479A - Blasting cartridge - Google Patents

Description

G. WEBER Jan. 12, 1932.

BLASTING CARTRIDGE Original Filed March 20, 1929 Patented Jan. 12, 1932 GUILLAUME WEBER, F HAYANGR, FRANGE, AssIeNoR 'ro Las Fisterra-Final DE FRANCOIS DE WRNDEL a om, or PARIS, FRANCE BLASTING CARTRIDGE Original application Ailed March 20, 1929, Serial No. 348,870, and in France December. 26, 1928. Divided and this application med June 7, 1930. serial No; 459,686.

The invention relates to blasting cartridges which contain cellulosic materials, adapted to absorb liquid oxygen, li uid air or the'lke, metallic powders, hydrocar ons and inert ma.-

5, terials, and it has for its object to dispose the various substances within the cartridge in such manner as to reduce the sensitiveness ofthe latter to shock. y

Certain metallic powders, such'as very fine o aluminium powder, some combustible organic materials, such vas cork liour and soot are very sensitive to shock. On the contrary, sawdust, peat, inert materials (for example dust from high furnace gases), certain metallic powders in -a state of coarser division, such as ferro-silicium powder have a comparatively vlittle sensitiveness to shock.

In order to reduce the sensitiveness'of the cartridge to shock and according to theinvention, it is suiicient, in certain cases, to mix, in suitable proportion, the material having a small sensitiveness to shock (such as cellulosic materials, which are thoroughly dried at a high temperaturebelow the carbonizing point) with the materials which are very sensitive to shock, such as fine metal powders in order to increase the safety with which the cartridges may be handled.

However, a greater safety will be obtained by enclosing the materials which are sensitive to shock within small bags or cases, similar to small cartridges, preferably with rigid walls, or by concentrating such materials, without any enclosure, at the middle of the cartridge so as to protect them against shocks, dueto the surrounding mass of materials of small sensitiveness to shock.A

In the case where use is made of a hydrocarbon, such as naphthalene,l the metallic powder which is sensitive to shock is previously mixed with said hydrocarbon.

The cellulosic materials, such as sawdust and peat are thoroughly dried in order to impart thereto a great absorbing power for liq- 45 uid oxygen, as 'described in my co-pending patent application No. 348,670. When the cartridges are used in coal mlnes and when it is desired to give them the maxlmum degree of safety, said cartridges areA 5o preferably provided with a tube or duct through which water or a spongy material saturated with water is introduced into the mass, said water freezing during the immersion of the cartridge into liquid oxygen, thus lowering the temperature of explosion due to 5 the meltingand vaporization of this water. at the instant of the explosion.

The water should be separated from the cellulosic materials in order to prevent any reduction of the absorbing power of the cartridge and of its effective life, and to prevent the explosive from hanging fire, which may be very dangerous in coal mines.

l he appended drawing shows by way of example a cartridge according to one embodiment of the invention.

.Referring tothe drawing, 1 denotes the cartrid e casing, consisting for example of a yiel ing tube formed by superposed envelopes (usually from 3 to 5) of combustible or inert material. This casing is sealed at one end by a bottom part 2, and at the other end by a top member 3, having an axial bore through which extends a tube 4 provided with a plug 5. Within casing 1 is enclosed the mass of. 5 thoroughly dried cellulosic material 6, adapted to absorb liquid oxygen. At the middle of the mass of cellulosic material is arranged a small casing 7 with rigid walls, containing the materials which are very sensitive to shock, for example a mixture of finely divided metallic powders with naphthalene.

When it is desired to lower the'temperature of the explosion, water or a spongy material 9, saturated with water, is introduced through tube 4. v

The cartridge is ired in any suitable manner.

In the appended claims, when'I use the term oxydizing liquefied gas, I mean any v liquid containing liquid oxygen, either pure or mixed with a variable amount .of liquid nitrogen.

Having now described my invention what I claim as new and desire to secure by Letters Patent is:

l. A blastin cartridge adapted to be impregnated wit an oxydizing liqueed gas comprising a casing, anl absorbing material filling said cartridge and a tube extending 100 into said cartridge and eontaining a spon material adapte to be impregnated wi of the explosi n.

' 2. A eartrid ehqontainin a cellulosie material previously dried'at a i h'temperature so as to remove all moisture an having a, hi h absorbing capacity for liquid oxygen a tu extending to the middle ofthe cartridge, liquid oxygen impregnating said material and spongy materials saturated with water adapted to be introduced in to the middle of the cartridge through said tube. l V

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

GUILLAUME WEBER.

water and to lereby reduce the temperaturev i

Images