US829595A - Blasting-cap. - Google Patents

Description

' PATENTED AUG. 28, 1906.

D. MOEAGHERN.

BLASTING GAP. APPLICATION IILEI) DBO. 20. 190B.

A TTORNE Y3 claimed.v v

' In the drawings, Figure 1 is a side view of [To' rtllivhor'm it concern:

DOUGALD 'MbEAQHERN. on nan OFFICE.

NAD Ai .AS-S'IGN ZJAM'ESI KAN EQ'OF"MARBLE. WASHINGTON.

AME-29,259.15.

' Be ,it known that I, DOUGALD McEAoHnii fi, asubject of the King of Great'Britain, and a resident" of. Erie, in the Province of British: Columbia and Dominion of Canada, have; .made certain new and useful 1m rovements' in Blasting-Caps, of which the f lowing is a specification.

-- My Invention is an improvement in blasting-caps, and hasforan object to-provide af novel'constructionof cap-whereby to prevent the passage of water to the explosive within .the cap; and the invention-consistsincer tain- ;novel' con tructions and combinations I wi'l-l'be hereinafter described and I :of parts, as

a cap and fuse provided with myinvention.

Fig. 2 is a longitudinal'section thereof. Fig." 2o- I plug beforeapplication to-the fuse; Fig. 4 is a'detail pers ecti-ve viewyof the in -tool.

I n the use of blasting-caps much'inconven I 3 isva longitudinal section? of the ca and Fig. 5 is a si e elevation-showing e crimpience'results from the passa e of water to the.

*xplo'sive within the cap,,it eing found that thecri'm ing of the cap in the usualinanner' skis not a ways eifecti've in preventing such pro vi e, in connection with the ordinary cap jber-which forms a as";

'. ingitool to operate upon it to produce the sired packing action without requiring so [much pressure 'of the "crim ing tool as to- "A, and the ordinary fuse B', a plug C of suitable material-such for instanceias rublining for the cap'and is made sufliciently thimto permit the crinpj. fracture or otherwise afi'ect t econtinuity of 40. Iginstan'ces when the mini ing is fected'the powder in the so that the flash will-not extend-to the endof the fuse and ignite the explosive within the the powder-filling within the forcibly 'efso will be broken,

cap. l It becomes im ort'ant, therefore, to make the tubular portion 0 of the plug C thin in practice, so that it can'be readily operated upon without too much pressure; but

4 ---,.whi n made so thin and fitted within' the cap 5 there is a tendency on the part of the tubular fortlon O" to roll up at its outer-end-bythe iction ofthefuse 1n inserting the same, and this is objectionable, as it tends to revent the proper insertion of the fuse. I t erefore men use, which is a the crimping-tool'D, 10f the drawings.

passa e ofthe water. By myinvention'Iv fuse. some the atter, and in addition this in inserting the plug within t provide my plug atits end with an out; wardly-projecting annular .fl'ange C, which EORj' OF'ONE-H'ALF To specificatibnpf net er ratenez' Y- i Patqnted Ailg; as, not. "Application filed Dcoen her ;].906. Serial ll'o abuts' the open endof the cap A' and by its thickness prevents the rollin'" 1 end of thelinin'g-plug and also forms I to limit the insertion of the-plug; as: will be understood from Figs.'1 1 and 2 of the drawings.

t the 'ordinary' .form,

and" as these caps I are usuall' supplied indifferent" sizes the imup of the outer a stop I will be" noticed that the cap maybe prove, plugs will also be made indifierent I be supplied with the lining-plugs of the fuses.

for application to the ends thus avold'any chan' 1 In: use the plug ,ter"being proper fuse end is inserted within the the explosive charge. v,After this the-capis crimped'one, two, or more times by the fuse of the tool shown in Fig. 5, as is usual in this-'- class of devices.

is fitted in the'cap' the ts;

sizes and will be fitted i'n their respective fitpalso' that-the caps as placed,- onthe market f r 3 ready";

e from the cap in some, apted to be treated by such as shown Fig ;5

y charged, after whic'h'the plug closefto r As before suggested, the tubular body of the plug is made comparatively thin,rso it will not occupy any considerables ace within the 'cap and 0 so ,it may e readily crimped to secure thewater-tight packing; of

the fuse within the cap. At the same time the .outwardly-projectmgannular flange C atthe outer end ofthe 'plu' operates as a stop to limit the insertion of ti ca and also as a means for. preventing the rol iing up of the outer end of the tubular bod by the friction of the fuse in inserting convenient portion to be'gra'sped by the hand e cap.

Havingthus described my invention, what I claim as new, and desire to secure by Letters Patent, is 1'. A blasting-cap provided with a lining consisting of a plug having a thin tubular body inserted wlthin the cap, and thickened at its outer end forming an outwardly-pro .jecting annular flange at the outer end of said tubular body and abutting the'outer' e plug into the.

flange forms a open end of the'cap and adapted to limit the.

and to preinsertion of the plugv in the cap,

end of the vent the rolling up of the outer plug by the friction of the fuse in insertin the-latter, substantially as set forth.

2. The combination of the cap, the liningplug having a thin tubular body portion fitting Within the cap, and an outwardly-projecting thickened'annular flange at the outer end of said body portion and abutting the open end of the cap and forming a stop to limit the insertion of the plug, and also operating to prevent the rolling of the plug by the friction of the inserted fuse, and thefuse insertedin said plug, the cap and tubularbody portion of the plug being crimped to form a Water-tight joint, all substantially as and for the purposes set forth.

3. A fuse-cap having av lining-plug for' blasting-caps consisting of a thin tubular body portion open at both ends and thickened at its outer end providing an outwardlyprojeoting annular flange. DOUGAL'D MCEACHERN.

Witnesses:

SoLoN O. KEM N, J os. A. RYAN.

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