US1159034A - Rock-drill attachment. - Google Patents

Description

H. H. HUGHES.

- ROCK DRILL ATTACHMENT.

Patented Nov 2, 1915.

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HARnY-EH GHEs or rouLrnEY,'vE1tMo1 iT.-

v y Y ROCK-DRILL ATTACHMENT.'

To all whom it may concern Be it known that I, HARRY HUGHES; a.

citizen of the United States, fresiding at Poultney, in the county of'Butland and State of vermont haveinventedcertain new 1 and useful Improvements in Rock-Drill Attachments, of which theq-followingis ,a specification. I a.

This invention has for its primary obgect the provision (if-simple and efficient means whereby the bridges or webs left between adjacent holes whichv are formed by a rock drill may be broken down and the rock split along the desired line of cleavage; Hereto= fore'the generally approved method of splitting the rocks was to drill a line of holes by the use of the rock-drilling machine; and then manually break down the intervening walls or webs by means of -a broach held by oneworkman and blows delivered upon the said broachby hammers in the hands of other workmento slowly break away-said intervening webs or bridges. This operation was laborious and time-consuming and, 1 therefore, expensive- By the use of my improved attachment the intervening, webs or 1 bridges may be readily cut away by the use of any rock drill andwithout requiring theremoval of the pawls by which the ordinary drill bitisrotated in the usual operation of the drilling machine. The attachment invented by me is also advantageous in that a rock drill may .be frequently employed in locations and in circumstances where the use ofa channeling machine is impracticable 1 or impossible. My 1nvent1on,-therefore, con-,

templates the provision of a .tool which may be; used in any rock drill and which will be driven into the hole without requiring any change invthe manner of operatingthe drill- 7 ing machine; The invention also seeks to showing myattac mer t in operative. prosi-u provide a tool which may be driven into a deeper hole, without change of any of the parts, than has been possible with tools here'- tofore provided, and finally the invention seeks to improve generally the construction p and arrangement of parts whereby the en ficiency of a rock drill may be increased. 1

The invention is illustrated in the accom panying drawings and consistsin certain: novel features which will be hereinafterfirst fully described and. then morefparticularly pointed out in the claims following the de se-:* i To f revent rotation of the cutter- 1 n the:

scription.

In the drawiim s Figurel is an elevation;

' Specification bf Letters 'latent. 7

tion with' the cutter lowered in the hole, and illustrating-the lowered position of the drill invention; Fig. 3 isa perspectiveview of thesame; Fig. 4 is a detail-perspective View of the thrust receivin'g-disk;

Thedrilling machineyindicated at 1, m

be of any; desired construction :and is equipped with a chuck 2 adapted to receive the shank of a drill :bit in the usual manner the said shank; being retained in the chuck by v means of a clamping bolt 3 inserted 9 I V Patented Nev. 2,1915? Application filed May ia a iswseriaino; 838,117; i

through "the'chuck, aswill be readily under stoodr In carrying out my invention I em-w ploy a; hammer or piston 4 which is pro:

vided with'sa shank 5 adapted to fit within thedrill chuck 2 and be-secured-thereinzin the same manner as the-shank of the ordi nary drill bit. This piston or 'hammerl is provided with a socket 5vin its lower end which is adapted to receive the upper end of a guide 6 which may be secured in said socket in any desired manner but is preferably threadedinto the same; as illustrated,"

so that'it may-be, readilyremoved'when necessary. This-tubular guide 6 is tapered asshown'at 7, so that-it may readily enter the hole formed by the drill bit, and in 1 length it exceeds the-stroke of the drill so" that, when inuse, the guide will-always be 111 engagement with the shank of the cutter and will=thereby efi'ectuallyjguide the same to the limit of the-feed of'the' drilling 'ma-;

chine. A diskh8', which maybeof soft steel, or any metal more suitable to the purpose, is fitted in the upper end "of the socket 5 over the device; The illustrated'cutter consists of a stem or bar 9 which is preferablyfiatsidedand has lateral 'fins or blades 10 at its lower end, thesaid bladesojr finsbeing dis- .95 the end of the guide, 6 so as to receive the, thrust of the drilling machine infthe use of housing a guide 61 loosely ,enough to permit f.

free movement ofathe guide upon the shank,

but also snu'glygenough,toprevent lateral vibration of the cutter:v vhen the; device is in o emount ng d'evi ceisojithat the work 1 and extends beyond the ends ofthe bars 12" and is equipped with locking nuts 15 to re-' tain a handle 16 upon the eyebolt. This handle 16 may be held by the operator or may be extendedup to the cylinder or body of the drilling machine and fitted in suitable holding and guiding means thereon. It will be readily understood that the engagement of the bars 12 with the fiat sides of the stem 9 will preventrotation of the stem and inasmuch as the blades 10 extend in planes parallel with the fiat sides or" the stem the posi tion of the blades will be known even though they may have reached a deep level in the hole. In the operation of the tool, the cutter occasionally strikes a flinty or hard surface which tendsto deflect it from its straight course and this action tends to form spiral grooves in-the walls otf'the hole, but the wrench shown and described effectually re-' sists and overcomes the tendency of the cutter to be'defiected in the described manner.

It is thought the operation of my improved attachment will be readily under stood from the foregoing description taken in connection with the accompanying drawings. The line of holes is formed by the operation of the drilling machine in the usual manner. The drill bit is then removed from the chuck and my improved hammer 4. and guide 6 are substituted therefor. The broach, consisting of the stem 9 with its blades 10 and shank 11, is then placed in position with its shank fitting in the guide 6 and its blades 10 resting upon the webs between adjacent holes extending in the line of the holes or desired line of cleavage. The drilling machine is then operated in the usual manner; the chuck will reciprocate with the piston of the machine and this reciprocating movement will be transmitted directly to the piston 4 and the housing guide 6. The guide 6 will reciprocate upon the shank of the cutter and the blow delivered by the piston of the drilling machine will be transmitted to the upper end of the shank 11 through the piston 4, the force of the blow belng expended in the contact of" the disk 8 upon the upper end of the shank, as Wlll be read1ly understood. Inasmuch as the tube 6 in the illustrated arrangement has a circular bore and fits loosely upon the shank 11 having a circular cross-section, it

may rotate about the same without impart ing rotary movement to the broach and, consequently, the only effect upon the broach will be the driving of the same against the webs or bridges in the rock so that the same will be broken away and the broach caused to descend in the hole previously formed by the rock drill. As above stated, the housing or tubular guide 6 will be longer than the stroke of the drilling machine and, consequently, will be in engagement with the shank 11 at all times, and as the piston is fed forward in the operation of the machine and the broach consequently driven deeper into the hole, the guide will eventually enter the upper end of the hole and the feeding will continue until the lower end of the piston 4: impinges against the upper surface of the rock. In actual practice, the entire length of my broach may be driven into the hole, excepting about one inch of the upper extremity of the shank whereas in tools which have been heretofore provided, so far as I am aware, over five inches was left exposed above the rock when the machine had been operated to the limit of its movement.

It will here be noted that the guide 6 of the hammer is slidably mounted on but freely separable from the shank 11 of the cutter so'that after the ledge is cut, the chuck carrying the guide 6 may be readily detached from the shank of the cutter by elevating the chuck in the usual manner until the lower end of the guide 6 clears the upper end of the'shank of the cutter. Such a construction not only permits the cutter to be actuated by the impact of a hammer in cutting theledge but also permits ready detachment of the guide from the cutter without the necessity of removing screws, bolts and similar fastening devices usually employed for connecting the cutter to the guide. Again,it will be noted that the impact disk 8 is locked in position on the head L or" thehammer by engagement with the upper end of the guide 6, while the enlarged head t of the hammer not only affords sufficient weight to drive the cutter when the drill is reciprocated, but by engagement with the rock or surface of the ground serves as a stop to limit the'downward movement of the guide within the opening in the rock.

It will be readily noted that my improved attachment may be applied to any rock drilling machine and will not require any change in the construction or manner of operating the same. When the thrust disk 8 has been worn through long continued use, it may be readily removed and a new disk substituted without requiring the provision of a new piston and guide and, con- 1 tion of the tool.

thereof so that there will be no lateralvibra-j The wrench orholder 12' 7 may be readily adjusted to any desired an-,

gle by suitable manipulation of the nuts mounted upon the bolts by which the sev eral parts of the same are connected, and the cutter will move freely forward through the said wrench or holder while at the same time rotation of the cutter will be efiectually prevented by the same.

It will be noted that the guide is not attached to the cutter so that there is no lifting action exerted on the cutter which is simply driven ahead and, consequently, there is no liability of either the cutter or the guide breaking andrendering the machine inoperative; Moreover, the cutting end or face of the tool maybe formed on the end of the shank and the. use of screws or other fastenings are unnecessary. This construction reduces the cost of manufacture and produces a stronger tool and also permits the use of a long shank so that it is not necessary to suspend operations at frequent intervals in order to change the tool as the hole gets deeper. The guide is not packed to form an air tight joint with the shank of the cutter but it is imperforate throughout its length. If the tool be hol low, that is, have a boreextending through its entire length and opening through both its ends, on the up-stroke of the hammer and guide some air will be drawn into the guide and upon the downstroke this air will be forced through the hollow bore of the tool and out at the lower end of the same where it will blow away the dust and keep the work clean of former cuttings.

vting point.

Moreover, the shank of the tool should tend to upset under the force of the blows delivered thereonrby the engine and the hammer, this tendency will be counteracted by the frictionbetween the inside surface of thehousing or guide and the outside surface of the tool shank so that the shank will bekept smooth and the machine will operate easily at all times. 'As the cutter is not lifted until it is withdrawn from the hole after the work is finished, it will always rest squarelyjon the bed of rock and will not wear away the corners of the cut- The machine also can be efficiently operated under a low pressure of steam.

Having thus described invention, what I claim is: i

A hammer attachment adapted to be se-' cured tothe chuck of a rock drill, comprising a downwardly tapered head provided witha threaded socket in the lower end thereof, a tubular guiding member threaded I into said socket and 'adaptedto loosely tele 1 scope with and reciprocate relative to the shank of a cutting member, and an impact disk held in the bottom of the socket of the head by the threaded portion of the tubular guidingmember and adapted to impart the hammer blow of the reciprocating head to the shank of the cutting member. 7 e In testimony whereof I afiix my signature in'presence of two witnesses.-

HARRY H. HUGHES. a 5.

Witnesses i THos. 'J. ROBERTS, J OHN R. MAHAR.

Copies of this patent may be obtained for five cents each, by'addre'ssing the Commissioner of Patents,

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