US663724A - Blasting. - Google Patents

Description

Patented DBO. il, I900. N.

[L 5 BRYANT 81. C. H. BRGW BLASTHQG. (Application filed 12m. 24, 1899.)

(No Model.)

A 770m rs.

CALEB F.

BRYANT AND CHARLES H. BROlVN, OF CRlPPLE CREEK,

COLORADO.

BLAST ENG:

To 11,137 Lo/wot if mo concern.

lSeit known that we, CALEB l BRYANTand CHARLES H. linowx, t Cripple Creek, in the county of El Pasoandiztateol' Colorado, have invented a new and useful Improvement in Blasting, oi'wvhic'n the following is a full, clear, and exact description.

The object of the invention is toprovidc certain new and useful im 'irovcments in blast ing whereby a plurality of charges are tired successivclyfroin a tiring source common to all the charges, so that the charge in any desired drill-hole (usually the weakest) is first exploded, that desired to go next (which is usually the next stronger one) following at an interval of time, and so on until all the charges are exploded, and the minor is enabled to count the reports of the successive explo ions to make suie that all the charges have exploded, and if not he can readily locaic an unexploded charge to avoid drilling inio the same and accidentally exploding it to the injury oi himself: and those around.

The invention consists of novel features and parts and cirnhinations ol the same, as will be fully described hereinafter and then pointed out in the claims.

A pract'cai cinbodiinent of our invention is repre.-;cnicd in theaccompanying drawings, forming a part of this specification, in which similar characters oi rcfcrcncc indicatc corresponding par i 1 both views.

Figure l is a .l-llillill sidrelevation of the iinprorcmcnt, and Fig. :3 is an enlarged soc tional side elevation of the primary igniting device.

it dynamo, ol elect rii' LiWlt-Plz fl z 2 the riitllil,

imary ig'n" l'nsis l) i)' l) ha; Kory, orothcrsuitablo source ill ncctcd by t Wire ll with it A olc'itric current through wirc ll la connected with :rices ,7 (15 for igniting lvely, having ordinary cl ps E in con iiii the charge to be igd and l'mttcd in the (ll'llllli lU. Tho prixary l"'lllllll" dc'-;icc shown in the drawings hell if", containing in its upper I of wood or other insulating d the lower end of the shell on D g s the upper end of the Fuse 1), D, or 1), and -ieirw nni the top of the fuse and the botol' the ping C is arranged a thin diakif l l l l i 1 PEGIFICATION forming part of Letters Eatent No. 663,724, dated December 11, 1960.

Application filed March 24,1899.

Serial No. 710,363. No model.)

of tin-foil or other metal to lessen the resistance of the air-space between the terminals '3" ll of the wire ll, a small amount of black powder or other combustible material C being arranged between the disk and the upper end of the fuse l).

lhrough the plug 1 and the disk C extend 01' a spark-producer B,

the tcrn'iinals B l3 forming part of the electric circuit, thelowor ends of the terminals extcndingintothocoinbustiblc material C.

Now when a current is sent through the wire 13 it passes from one terminal to the other by way of the disk 0'', and as the latter is extremely thin it can carry buta small amount of the current, and it either burns out or causes a spark from one terminal to l the other, so that in cither case the combustible material C" is ignited and the fuse D is thcrcbylightcd. Nowit is evidentthat when an electric current is sent through the wire 1- the several igniting devices (3 U G are simultaneously ignited, and consequently the several l'uscs l) I) D are set olf. The fuses l) l) l) are made of dilfcrent lengths, the shortest fuse leading to the chargcdcsired to explode ll rst, which is usually in the weakest drill-holc -tiiat is, one that will break the asicat-and the next longer fuse is connectcd with the drillholc desired to explode next, which is usually the next stronger drill-hole, and so on, so that the several )XDlOSlVO charges in the various drill-holes are exploded at intervals and according to the length of the fuses.

It is evident that by the arrangement described the operator is enabled to readily count the reports of the several explosions as they take place at intervals, and in case one charge docs not explode tho operator knows by the interval of time that has elapsed between the preceding and the following charge which one of the charges has not exploded. Thus the operator is enabled to locate the unexploded charge lozwoiddrilling into the same and accidentally exploding the charge.

lSy using tin-foil as a partial conductor for the electric curro'nt in the primary igniter a positive ignition is always insured, and [00 more primary ignitcrs can be set oll at the same time by an electric curl-cut of a git on.

conductor were omitted. The shells C reuder the primary igniters moisture-proof to prevent the danger of the formation of a short circuit, especially as the ends of the shells O are securely crimped on the plugs and the fuses.

An ordinary cap E is generally used when dynamite or the like forms the explosive charge in the drill-hole; but in case gunpowder or like explosive is used for blasting then the cap E may be dispensed with and the lower end of the fuse I), D, or D may be directly extended into the gunpowder or like explosive, which is then ignited when the burning fuse reaches the powder.

It is understood that by the arrangement described a miner has absolute control of the explosion of the charges and may have any one or any set of charges set off at different times and still connect the same in series, allowing, say, ten to fifteen or any number of seconds to elapse between successive charges.

Having thus fully described our invention, we claim as new and desire to secure by Let.- ters l-atent r 1. A blasting device, provided with a fuse, a primary igniting device for the fuse comprisinga shell engaged by the fuse, terminals forming part of an electric circuit and extending into the said shell, a disk of metallic foil connecting the terminals, and a combustible material arranged between the disk and the fuse, substantially as described.

2. A blasting device, consisting of an electric circuit comprising a source of electricity, a single leading-in wire, asingle return-Wire, a plurality of primary igniting devices, connected in series in the said circuit and set off simultaneously by the electric current, the said primary igniting ing a shell engaging a fuse at one end, a plug of insulating material in the otherend of the shell, terminals forming part of the electric circuit and extending through the said plug, a disk of metallic foil located between the indevices each comprisner end of the plug and the fuse and c0nnect--.

ing the said terminals, and combustible materialarranged between the disk and the fuse, the said fuses being of different lengths, substantially as described.

CALEB F. BRYANT. CHARLES H. BROWN; Witnesses:

CLINTON S. FLETCHER, JOHN ALISON.

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