US1890726A - Water-tight explosive cartridge - Google Patents

Description

Dec. 13, 1932. w R, i E 1,8WL7Z6 WATER TIGHT EXPLOSIVE CARTRIDGE I Filed Aug. 20, 1930 INVENTOR. W/u MM If, EARRE/V,

A TTO RNE Y.

atented ec. 13, 1932 at are WILLIAM R. FARREN, OF TAMAQUA, PENNSYLVANIA, ASSIGNOR TO ATLAS IOWDER COMPANY, OF \VILMINGTON, DELAWARE, A CORPORATION OF DELAWARE WATER-TIGHT EXPLOSIVE CARTRIDGE Application filed August 20, 1930. Serial'No'. 476,631.

l frequently has to be given to the question of whether the explosive is sufficiently res stant to the water likely to be encountered rather than to whether the explosive is the most efficient or the most economical. For instance,

there are frequent cases where expensive gelatin dynamites are used for work which definitely demands black powder or low density ammonium nitrate dynamites, and where the most marked economy could be effected by the substitution of the latter for the said gelatin dynamites.

As is well known, the explosives commonly employed for blasting are in the form of sticks composed of fairly heavy paper wrap-- pers, filled with the explosive and waterproofed to a limited extent by being dipped in parafiin after the paper wrappers have been closed. As theresult of extensive experiments, I have evolved the hereinafter described method of assembling explosives in cartridge form by packaging them in a specially prepared flexible wrapper, which takes the place of the paper wrapperhez'etofore used, and which yields a cartridge capable of resisting the entry of water, even in the .presence of decided external pressures.

The application of Roy Linden Hill, Serial Number 436,888, filed on the 18th day of March, 1930, covers the broad thought of an assembly of the general character of that herein described, the present invention residing more particularly in the improvement of a very simple and economical means for expeditiously sealing the wrapper.

In the accompanying drawing Fig. 1 is a vertical sectional View, and

Fig. 2 is a side elevation of an explosive assembly constructed in accordance with the invention.

In the drawing, 5 designates the main body of explosive material, and 6 represents a re- V ceptacle for the same, which is, preferably, in the nature of a rubberized water-proof and moisture-proof fabric. This fabric may be rubberized on either or both sides. If rubberized on only one side, the uncoated side is disposed toward the outside of the cartridge so that'water will not be' carried to the explosive, .by capillarity. The important feature constituting the subj ect matter of the present invention resides in the provision of a sealing means preferably at each end of the assembly consisting of a plug 8, which is, preferably, of rubber or like compressible, water-proof resilient material, about which the free upper end of the fabric of the receptacle may be gathered, as indii cated at 9, such gathered-portion being bound, forcibly, into water-tight union with the plug 8, by a wire or other compression strand 10, the ends of which are twisted together to the extent necessary to secure the desired drawing and binding action upon the strand. The water-proof union between the cloth and the plug is produced jointly by the tension of the wire or strand 10, and the elasticity of'the rubber plug, these two forces acting in o posite directions against the rubberized fa ric. To facilitate the application of the wire strand, its ends are, preferably, looped, as indicated at 11, to facilitatethe engagement of a tool therewith. However, it is to be understood that the invention is not limited to any particular type of strand, nor to any particular material for the same. I contemplate. the use of any band adapted to exert a drawing action about the plug. However, the provision of the ends of the wire with the loops shown, is of utility in that these loops serve the double function of .providing engaging means for a tool, and of providing elements which may be engaged by a hook, or other lowering device for loading the explosive into deep holes where dropping might cause -ruptures, and thus destroy the water-proof container. It will be observed that the plug 8 will be of considerably smaller diameter than the sheath 6 and thus the supporting loops 11 may be caused to lie wholly within the projecting plane of the side wall of the sheath so that there will be no drag on these loops or the suspension hook attached thereto, upon the side wall of a bore hole during the lowering of the assembly.

While I prefer to use a pliable rubber plug as the compression member, any plastic material, such as pitch, tar, rubber, cement of such weight as to form a distinct body, etc., would serve. Furthermore, I might use a rubber-covered cloth having the rubber of suflicient weight thereon that when disposed inwardly, it would produce a body thick enough to provide the desired sealing means, when drawn upon by an external strand, and it should be understood that the invention includes this within its purview.

It is further to be understood that the invention includes within its purview the thought of utilizing the Water proof fabric to housea main charge of explosive either Having described my invention, what I claim is 1. An explosive assembly comprising an explosive cartridge, a water-proof fabric receptacle enclosing the same, a body of waterproof compressible material within the fabric, a twisted wire strand for binding the fabric forcibly upon said body, said strand terminating in a loop constituting a suspension means by which the assembly may be lowered.

2. An explosive assembly comprising an explosive material, a water-proof fabric sheath for the same, a body, of water-proof compressible material withln the sheath of considerably smaller diameter than the sheath, a twist ed wire strand for drawing the fabric forcibly upon the body of the compressible material and loops in which said wire terminates, said loops constituting means for suspending the assembly, as andfor the purposes set forth.

3. An explosive assembly of the character described, comprising a body of explosive material, a tubular fabric sheath for the same having a rubberized side disposed inwardly, a plug of waterproof and compressible material of considerably smaller diameter than the diameter of the sheath, disposed in a gathered, open end of said sheath and a That is to say, the explosive may said wire strand being bent into substantially I longitudinal alignment with the body of the sheath and terminating in a suspension means for the assembly.

4. An explosive assembly of the character.

' outer surface of said sheath.

5. An explosive assembly of the character described comprising a body of explosive material, a sheath for the same of waterproof material, a compressible waterproof plug disposed in an open end of said sheath,

'and an external binding means extending entirely around said sheath and plug and drawing the material of the sheath snugly against the plug at all points, said plug being of such materially smaller diameter than the said sheath that the drawing means and those portions of the sheath which are drawn against the plug will lie wholly inwardlyof the plane of the outer surface of the sheath, but said plug being of sufliciently great diameter that the extent to which the sheath is gathered to be brought into contact therewith will not be enough to leave channels through the sheath along the plug, whereby the assembly is adapted for use in a bore hole under water and under pressure.

In testimony whereof I aflix my signature.

WILLIAM R. FARREN.

twisted wire strand compressing the material of the sheath forcibly against and into the material of the plug, a terminal end of

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