US2043565A - Blasting cartridge - Google Patents

Description

"ImneQ, 1936. lks. WEBER BLA'STING CARTRIDGE Filed oct. 4, 195s 2 Sheets-Sheet 1 :ewa R e n a NWNP. E v E MM u n m` .U GW

june 9, 3.936.. G. WEBER 2,043,565

BLASTING CARTRIDGE Filed om.. 4, 1935 2 sheets-sheet 2 L 17 g '84j HTfoeA/z) Patented June 9, 1936 l PATENT oFFlcs BIASTING CARTRIDGE Guillaume Weber, Hayange, `France, assigno to Les Petits-Fils De Francois De Wendel t ie..

,France Application October 4, 1933, Serial No. 692,063 In France 2 November 9x 44 clams. (c1. 1oz-ei A type of cartridge is in current use, in-which the explosive substance consists of liquid carbonio acid. However, it is a known fact that at the ordinary temperature, carbonio acid cannot be maintained in the liquid state except when it is compressed. vFor instance, at the temperature' of about C., which is a normal temperature, the compression of the carbonio acid should be effected at about fifty to sixty atmospheres. It is 10 evident that in such conditions, the walls of the cartridge must be particularly strong. Thus the known cartridge has very thick steel walls, which however dov not protect it against a premature explosion, as the carbonio acid in the cartridge 15, may be in the state of a highly-compressed gas.-

Such a cartridge is expensive, owing to the quantity of metal required and to the machine treatment of the case.' whichcase must also be made inV several parts whose assemblage must be gas-tight for the very high pressures above-mentioned.

0n the other hand, owing to the thickness of the walls, the cartridge has an outer diameter which exceeds the usual diameter of the mine blast-holes, 'which is approximately forty millimeters; thus the blast-holes require to be enlarged by -the use of special boring machines.

A The present invention has forv its object a new safety explosive for coal mines which contain lo lire-damp or dust, for potash mines whichmay also contain fire-damp, and in a general manner for all other uses. This explosive is characterized by the fact that it consists of carbonio acid in the solidified state. as Due to the solid state, the handling of the carbonio acid is much facilitated, as this can be effected, without inconvenience, at atmospheric pressure, and even at the ordinary temperature, since this solid carbonio acid is merely gasified, 40 and in fact rather slowly. It is possible to place the solid carbonic acid in cases which are not gas-tight and whose wallshave but little strength,

for instance in bags or tubes `of paper, asbestos, v

etc., whose diameter may naturally be aas-desired, and is comparable with the usual diameters of the blast-holes.

' The. invention further relates to a cartridge, which is chiefly characterized by the fact that it comprises. in combination, in a case of any kind which is not gas-tight, and consists for exampie of paper or asbestos, a charge consisting of solid carbonio acid, and a device of any kind which is adapted to produce a considerable rise of temperature, thus causing the instant gasitying of the solid carbonio acid.

This device may consist chiefly of a usual priming cartridge containing liquid oxygen or the like, and preferably of a safety type. which is provided with an igniting device (for instance an electric resistance or' a Bickford fuse, with or s without a detonator).

The heating device may also consist of an electric resistance. l Y

The invention further relates to methods for the use of solid carbonio -acid as an explosive. 10 or of the aforesaid cartridge.`

It is feasible, especially, to place in the'blasthole either one or morecartridges, or separately. a cartridge and one or' more charges of solid carbonio acid, or several charges of solid carbonic 15 acid separately, by a priming cartridge.

In the accompanying drawings which are given solely by way of example: y n

Fig. 1 is a lengthwise section of a cartridge accordingto the invention. 20

Fig. 2 is a section of amodification. Fig. 3 is a section of a recipientadapted for the 'transportation and the preservation of the cartridges.

Figs. 4, 5 and 6 represent methods for using g5 the cartridge and the explosive according to the invention.

In the example represented in Fig. 1, the cartridge comprises a case I which consists forexample of a tube made of a flexible andl insulata0 ing substance, for instance an inert material such as-asbestos or paper. 'Ihis tube may be obtained simply by winding upon itself'a sheet of paper, asbestos etc. The lower end of the tube is simply folded over at 2 in order to form 35 a bottom which need not be gas-tight. and even the contrary, as this facilitates the exit of small quantities. of carbonic acid which maybe given off between the time of manufacture and the time of use. y '40 The case I is lled with solid carbonio acid 3 up to a certain level ab. This carbonio acid .I maybe used in the state of pieces, -as shown in Fig. 1 or of snow, as shown in Fig. 2. It is prei'- erable to press down the solid carbonio acid so 45 that it will bc well packed, or even compressed.

Above the solid carbonic acid is placed a priming cartridge I. Thismay consist of anyV known material. It may consist of combustible powders' (aluminium. sawdust. carbon, etc.) eon- 50 tained in liquid oxygen, or of any other explosive, and preferably of a safety type. The said priming cartridge is contained in a case of little strength 5. made for instance of paper or asbestos,thecasel. ".55

Il formed onthetube i'.

intheplug iltopermlttheexitofthecarbonicacid which is given of! between the time of manufacture and the time of use.

The operation ofthe cartridges isfas follows.

, 1 the instant `vapor-intimi of said carbon dioxide. deilagration 'of the priming cartridge l (Pig. 1)'.

The casel isfolded'atitsupperendat ,YUPOn theprimingcartridgel.- Aholelisthenpierced throughthefoldcdendotthecaseiand-thmngh thecartridgel. Anignitingdeviceisplacedat the bottom ofthe hole 1. 'lhlsdevicain the ford fuse. Itis also feasible, if desired. and if thenatureoftheprimingcartridgelwilipermit. touse'astheignitingdevicesimplyanelectric resistance i or'aBickford fuse. y

Inrig.2isrepresentedamodiiicatlon.inwhich thecaseofametallictubeiofarelativelygreatstrength. 'Iheprimingcarti'idseis eliminated, and is replaced by a simple electric resistanoe'il. 2Itistobenoteclthatthisresistance |l might`be embedded inthe wall ot tube I', which latter will of latingmaterial. Thetubelisclosedbya ll,whichismaintainedforinstancebya Holes Marepro y or u the electric resistance, u und. 2 1. me charge 'l oi' solid carbonio acid is abruptly gasied.

producing a volume of gas which is n ve hundred times its own volume. As will be observetLthe power of theexplosive is quite Por the transportation ofthe cartridges from the place of manufacture' to the place of use, and for their preservation, use will be of-non conducting recipients, or'prei'erablyof recipients (Fig. 3) of-any usual type containing liquid oxygen It or other liqueiied gas at a'temperatme somewhat near '188 C.. for instance, this being much lower than that of'solid carbonio acid, whichisnear 80 C. v In order to make use ofthecartridgecontaining solid carbonio acid, an ordinary blast-hole I1 v(1"18. 4) labored.

. v The cartridge, which isfor of the type ofrig.l,isplacedattheinnerendoftheblast hole. which is then wholly o r partially filled with any suitable tamping II.

It is of course feasible to combine the cartridge according to the invention with one or more additional charges of solid carbonio acid. AIn the example represented in Pig. 5, in .the inner end ted. consistsof acuden-mn dioxide to of theblast-hole I1,isplacedasmallgbag Il con-1 taining carbonio acid. Thecartridge I isthen placedinsuehpositionthat-theprimingcartridg'elwillbelocatedbet'weenthetwocharg `Iandl'ofsoli`dcarbonicacid. 5

Intheexamplerepresentedinlig.6,theprim ingcartridgedisindependenhandislocatedbetweentwocharges3'andI",eachofwhichconsistsofoneormoresmallbagsofsolidcarbonic acid.

,theinventionisnotrlimitedtothe aforesaidmethods of execution and utilization. which aregiven solelybywayof. example.

Having now described my invention what I claimasnewanddesixetosecurcbyLettersPat- 15 entis: v l. A blasting cartridge comprising solid carbondioxideintheformofsxnall'pieces,aheating element adapted to produce the heat n to causetheinstantvaporixationoisaidcarbondi-ilo oxide,and a exihieand insulating envelope permeabletogascontainingsaidcarbondioxideand saidheatingelementandadantcdto allow gaseouscarbondioxideismingfmmsaidsolidcah. bondioxidetoescapcoutotsaidenvelope.

:.Ablastingcartridgecomprising'solidcarbon dioxide in the tos-molino', aheating element adaptedtoproducetheheatnecessarrtocaue heat-ing element and adapted to allow gaseous carbondioxideisniingfromsaidsolidcarbondioxidetoescapeitolsaidm 3.Ablastingcartridgesolidcarbon35 diorxideiutheformetsmallriiecesmheatingele eincaiiei'nitofssiden-l 4. ausstinrrtrldse' sondeuboa dioxideintheforlnofsinallpieces,aheatingele men lafdapiieiltoproducetins-heat:necessaryto dioxide,anda'ilexibleandinsulatingenvelopeof asbestoepermeabletogascontaining said carbondioxide'andsaidheatingelemmtandadapt edtoailowgaseouscarbondioxideissuing-Irom said solid carbondioxide to 'escape out of said enilveloiie.,Y

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