US821202A - Drill for drilling holes in rock or the like. - Google Patents

Description

PATENTED MA: 22, 1906.

. J. H. THOMAS. v DRILL FOR DRILLING HOLES IN ROCK 0 THELIKE.

APPLIUA TION FILED NOV. 14, 1904.

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u; 434 it than) l\J it In -1; in a JO i T HENRY .CHUMAS, Oi 5 Application fileil ilovember To all 10/7/0772 it mew con/(367%.:

Be it known that a subject of the I Ji'ihennesburg, in veal, have invented certain new and useful Improvements in Drills for Drilling Holes in. Rock or the Lilac, (For which i have insole epplicstion for patent in the Transvaal, No. 293, filed July 20, 1904,) of which the iollow- 11g of England, residing at 'ing lS- specification.

The ire-sent invention is applicable to the drills or hits employed for drilling holes in col; and the like in mining, quarrying, enrl similar operations. It may be utilized in the production oi such tools either for hand. or machine drilling.

The iilliJiOVQIllfiiltS reletc particularly to the kind. of drill or tool which provided With detachable and. renevm-hle hits or euttion in detail by aid of the accompanying sheet of drawings, "wherein by Way oi simple 1 illustrate the same epplieii in the construetienoi e chisel hit or tool formed with one transverse Cutting' edge.

litthe ire ignite i represents an eleiuttii-ui oi it oerti of the rrill steel she-nil: with the iietecluihle cut filXLti therein. .2 is en elcvetion ct 'ht eng les to l i is en elevation the shank or s e with ti o cutter rerno v'ilti.

l is a plan if-Fig. O. lii 5 2L side elevs. oi' the cutter iietitel ((l. o

ution oi Fig. lfi 7 is it plain of th techeil cut seen irom the llIMlQT st c. Fig. 8 is i cutter.

in the drawings, 1. reurescnts the drill or steel, end 2 the (let/echo l (the steel i.

is en end l e eiul rcnevmhle hit o; cutter. s, 2L3 shown, proton ably hiweleil oil on two opposite sides 3 for e port itu oi its length in the direction of the cletuehehle cutter 2, end it pr YOLUUiOtl oii between seitl.

" beveled. let

Specification oi? fillet-tors Patent.

, JOHN HENRY Tiroims,

thei lolony oi the lrensview of the ileleeheii G H A N N ll it (i is, wet Serial Hi). 232.655-

incliceterl et 5 in Figs. '5. anti the end of the steel i is formed 9. slot 6, which slot rounded. cur bottom, as indicated 7 and Ward and upward, we i at at, h s; shoulders or projections '8, formed at the of the rounded. portion '5, to the end drill. or steel it. The slot '3 is else mettle to or wedge shape tre'iist 'sely oi? the steel illustrated more pertie end 4.

The curl oi? the s hetwe and the rounded e l i o W" the center, is seen a i.

The hit 2 in its up} triengu or substantially Whic upon it the cut cu rig edge 10 su proper eieereiice for: sit penetrates the rich. triangular portion are she 'e. side to iit the beveled parts 5- 0?- th The portion oi the cutter or hit iittcii in the slot oi the steel '3'.

shape of the slot 6 thet to say, it is fashioned with it bulbous or round egl eni tepereils lower portion 12, corresponding to th upper portion of the transverse slot 6. v

in etteehin the cutter 2 to the steel. 1 the smaller e hulhii'orin projection 12 is inserted ierger end of the trsnsverse slot 6 and the "butter 2 their projectecl trensely ecri ml of the steel 1 until the ectiou i' tly his the slot 6. he i ,2 is iieteeheii by moving: it in the 0pdirectionus, for exei'nple, by tapping "t with e heiunici or otherwise.

iet l. cluiin its my invention, and desire l -to protect o3, Letters Pe out, is

in it drill for (illlllllg holes iii rock; and the like, in combination, the steel .l. beveled oil on two opposite sides 3, i, and formed with s transverse slot 3, rounded at the bottom '7 end. heveleil inward end upward to the top of the slot and tapered trensvcrsely, the encl of the steel being beveled upwerill from the sides 5 to the edges of the slot, t 10 cutter .2 shaped on the under side to it the beveled end the steel 1 end formed. with it projection 12, corresponding '0 the transverse rounded bottom portion '7 oi the steel 6 endwith it bfiitllfil upperpert 1?}, which mettle taper or wedge shape, es is clearly illusreteii in Fig. 6, to correspond to the semi a oi the 5 being substantially the same as the diameter Witnesses:

slot 6 formed in the end of the steel 1, said hand in the presence of two subscribing Witcutter having its cuttingb edge of a greater nesses. len th than the distance etWeen the sides 3 an 4 of the steel. 1, the Width of said cutter JOHN HENRY M of the steel at right an les to the slot therein. CHAS. OVENDALE,

In Witness whereof have hereunto set my' B. QVENDALE.

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