US1176041A - Drilling-machine. - Google Patents

Description

H. T. DUNBAH.

DRLLING MACHINE.

" APPLICATION FILED MAY zAI 1912.

Patented Mar. 2l, 1916.

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H. T. DUNBAR. DRILLING MACHINE. PPLLCATION FILED MAY 24.1912. i 176 O41. Patented Mar. 21,1916,

9 4 SHE'ETSHEET 2.

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H. T. DUNBAR.

DRILUNG MACHINE.

APPLICATION I-'ILED MAI/24,1912.

Patented Mar. 21, i916.

` 4 SHEETS-SHEET 3.

w 2J' A 7. w 5 I 5 D f w 7. 7 6 .u Wm I my d I APPLICATION FILED MAY 24. 1912.

Patented Mar. 2l, i916.

v 4 SHEETS-SHEET 4.

" i INvNTn "ingis-a specification. l 'relates ftoa `drilling` maf s more particularly 'designed ry. tq'uiastinglfhe Sama aithopghihis h "e:maylalsobeLusedfor drilling rook here f and* Afcryother ypurposes.

ma y attempts l have hbeen r'ock.` ,Whenfdrilling y holes 'pneumaticf hammers "yvill ahhe purpose' but |`when these .holes are gularf It fis' -`possibllffor thebit to th me" spotseveraltimes in sucargelchipsreliable to be formed er andtliisnecessitates pulverizing these they7 can@ so removed." `Inl order to sfthe diameter oftherbit fmetei'yvf the barfto lsuch (of, at, least. g of an inch- Dammusi-'MACHINE Specification of Letters Patent. Patented Mar. 21, 1916. gippiicafipn flied may 24, 1912. serial No. 699,394. y ,4

l iznof .the-dUnited",States,' residing `at "lalginvthe`countyof *Erie and State of 5 -Nevv York, have inventedfnewf andnseful vementswDrilling t- Machinesy f;

dii'illingfliolesfincroclrsunder water pre-f chip thus formed must be pulverized While.

' loose. Thsresults in delay and reduces the l feliciency I and capacity Voit' the machine.

vSuch chips sometimes fall from a Seam beeapen handy simplify the i atively Ydeegifor located at. a considdistance-freni the sourceof power the "`tween"th`bit 'orrchis'el and the motor f Ql'gfnd Ynptgonlv renders it 'imprac-,

' e machinetbut the barV Qthe rapidv hammeringt v"Inorder to overgenand .heavier havebeen employed which ting drill Abar; in order.

, men to yoperate each drill. the fact that in submarine drilling thedrill rcevspeed, injdrlling'. 'In Agrnachines the bit-was r'of a `'ratchet mechanism machine.` H-Notwithstanding that this thetspacln'g of thebloivson 'the rock 'lbelvvashedfiit of 4the holes by o fthe" proper `"degreefof; fineness be? `guided so as to hold them inl position and ay hegflinsertedr betweenf'the.

"DUNBAR, y or `BUFFALO, `maw vomi.

. dvi/1 in use are also disadvantageous on acs/count of `their excessivey Weight and also because; Vthey strike too heavy a blow regardless 'of the `.direction in which the drilling is being done. Such heavy blows are liable to produce a large chip in a drill hole when the drill approaches a seam` inasmuchl as the bridge or last vpart of the rock before reach-` ing 4this seam often breaks down and theV hind fthe bit-or ygravelor chips wash-from abovefinto the holeand jam" the drill bar so that `great power is requiredto pull the bar and chip out of the hole; Often times the barcaunot be so removed afnrd must bev left in rthe hole, thereby. not only losing the bar 'but also the time spent in formingthe 'l5 hole. l Owing to the' .greatweight of the drilling `machines heretofore in use and the number of parts which required manipulation it has been' foundnecessary to employ a number 'of This isdue to bars are often forty feet in length, `two inches in diameter and provided with a bit which is three and a half inches in diameter.' This necessitatesthe,employment of a large' number ofmen and hydraulic ran'is or steam Winchesfto handle the'l drill bar'in the various necessary'operations.

It is the object of this invention tov reduce some of the difficulties of drilling .above mentioned.- Withthis end in view a. reciprocating'` hammer bare; of comparatively y small diameter is employed which is operated tosti-ikea numbercf blows per'minutey 95 'much less than the pneumatic hammer and fmuchmore than in the heavy type of rock f drills new in use, which hammer bar and the bit .operated by; the `hammer bar are prevent 4deflection of -the bar under the i thrust which .the same receivesl from` the vmotor.v The guide tube serves'also tokep chips from falling behind the'bit, the diameter ofbit exceedingthat ,of the guidel by the small amount necessary to give chan` mel to the therein.l

Wash water and pulverized stone tuoA 1 l eration and the parts comparatively lightin weight so thatl a crew of men .with a boiler,

pumps, &c., .of a capacity heretofore neces sary for operating a `single drilling machine of the typeheretofore in use can operate a number of drilling machines which are constructed accordance with my invention.

tive regular spacing,the idea bein to strike a'large number of closely spaced vlows'and tlildgh"A the guide: bldws `the bridge at the seams in the roclz'4 are-.also not liable 'to be broken down so soon,

Owing to the4 light Athereby reducing the sizeof the chips which by reducing the interruption of the drilling otherwise Supported.

` same.

are vformedhwhereby the work of pnl-verizing the chip-'sto permit of washin them out of.' the hole islessened. HThe liability of jam ming oli-locking the drill bar in the hole and losing the '-'sa'me'isg'reduced to a minimum. By reducing the cubical contents of the hole,

operation, by enlarging the number of.rnachines which any certain crew'canf-opera'te the Ycost of drilling per foo-t i s "m aterially In the ,accompanying drawings consisting`- of 4 sheets: Figure 1 isl a vertical longi' tudin-al section of the upper partv ofone form of drilling machine embodying" my inventioin-y Fig. 2 is-a vertical longitudinal section, on an enlarged scale, of' the lower Y* part of said machine', Fi 3 Iis a side elevation of the lower` part o the drilling ma' chine lshown in Fig-'2.' Fig. 4 is a bottom plan Iview ofthe 'bit'l and tubular guide vof` -thepart's shown` inFfigs. 2 andB. Fig. 5 is` a horizontal section taken in linea-5, Fig. 2. lFigr is a `vertical longitudinal section of the upperA part of another :drilling ma-'1 -chine constructed in accordance .with m invention. Fig- ,7 is a verticallongitudlnalgsection of.: the lower part-of the last mentioned. orm'of drilling machine.. Fig. 8= isavertical longitudinal section, onanen. larged scale,l of thc'construction s hown'in` Fig. 7. Fig9 is a bottom plan View ofthe section, on anenlarged Scale,.taken inline 1-l-11, Figa?. Fig. 12. is a vertical longitudinal section' showing still' another vform of bit, hammer bar and the means for guiding the vsame embodying my invention, the

section being taken in line'12-'12 'Fig. 14:.` Fig..13 is a similar ,section of thelastgmentioned parts taken in. line I3-132i;Fig."114i.,A

e carried u and awayV atgwhich is. continuously orced clowi'i' v Referrmg. to. Figs." 145,' 1 represents the to the cylin Fig.' 10 is a horizontal section-taken. in line `10-.10,Fig. 8. ;Fig. 1'1 'visa cross. .not shown` v Extendingupwardly, fromv the frame' and f 'inclosing the recipnocatingengine," its valve 120ii --mechanism and thecolnpressedpair' su ply 4tfal'section taken-in' line 16-16, Fig'.Y 15.'V Fig.

` lizedto-hold thev same to its' work.

Similar characters of reference-indicate 'corresponding views. 3o

`main frame ofthedrilling machine whi'chlA may be of any suitable construction to'support the main working parts of the drilling mechanism.l l`Inthe position `of'th e parts g5' 'shownin Figs.` 1,52 and 3 the machine isadapted for drillin a hole in a yrock downi Wardly, this hein -lePsiti'on in which the machineis u fwhen boring'rocksubmerged in water while the machine ismountl- `on a vscow floating-upon' the water or is'" Onthe upper part of -this framel 1s mounted a `reciprocatinl engine or'motonwhereby motion is' pr uced or delivering hammer lblows' with comparu- 915 tive irequcne'yy againsta bit or-"`tool 2 which i y drills the Vhole in the rock. This motor ma .1 4be of an suitable construction but .is pre -pf Aerably o the well known air operated type `:and only the', main elements of the same are `10o therefore s hown in' Fig. 1: Asthere shown this motor comprises fanfupright working cylinder and having a piston rod 5 project- 105 a stuiing box 6 at the; lower end-bf the c 1- ind'er, and a pipe .7 connected with the c 11nder and adaptedy to supply\comp air lowering' the vpiston -fthferein The/ valve4l mechanlsm'wherebythe compressed' 'air isiadmitted into'and exhausted rom opposite ends ofthe working`cylinder-for raisingand,

` lowering its, piston forms no artofthls in- @1115 'vention and as the same may of any suitable construction `the details of the same are .f pipe or tubeis a' casing'S Whichi-risesa oye V .the waterlevel and 'is .adapted^ 'to. l'rotgct the engine and the 'parts'connect vthe water Thiscasingjns therefore made of the required len'gtnj-tosuit the. articular depth `at which the Surface of 't e. rock l to be drilledis arranged belowjthesurface parts throughout the severalier for alternatelyralsing and 11p main" iframe" which,'charnber` `jincloses .the

^ stuiing box1 Gvatj` the "lower" end of thecylinfden `pf'ancl is lpreferably made waterwtig'htl 'orpurposes which will Ypresently appean` y fo white isppefembiyef cylindrictifgrm ross wsectiongand*whereby Vahammer hammer bar is arranged? in' an i opening ijrrnedinv the lower head :ofthe chamber 9 ton `rod within"thischamher; The connecytfion' between'these two rods may be effected drawings being suitablef and comprising" an "5@n.gheeouplingfysieeve 11 having utmp-` erf 1nd n lower ends offits bore tapered inv wardly Jandfadaptedf toreceivey the corre-M spending ,tape'iu e'` ends fof kthe piston prod l"hammerbar whiehware secu-red- `within l andlowei" fbodyisections" and the coupling` sections` off a guide]` tube which is e enlarged "part llanditsjends provided w 'th Xternal` screw "threafds 17 which ent n "gagelwith internalpthreadsin thel opposing fe ds]lofftivo#intermediate body .,wsectiofns.

n i perwendgalso connected'with `"the flower end l I. l b'y\one`` `otitheA 'coupling sleevesfil." The i Jnumberwandl,length fof"k intermediate body l mdf. oupling'xsections] which are employed anta; that `Shawniniiiigs.` 2, a, 14 and 5 is suitable;'and-comprises'angupright shanlr 1.8 arranged within` the lowermost coupling t ongfl andTtheadjecentbodyLseetions'of ide "tube, a plurality of cutting blades,` In p teeth $19` f projecting laterally p from represents anlfupri'ght'hammer 4bar or l i i i u i i i i l 4 n i blow "iis delivered against the drill b1t."` This and l isf preferably detaehably connected at i ivtsgupperend withgtheflowerend-{of thepis-l by any suitablemeans5` thoseshown in them means of ,the up 13,1 14 i representfjthefupper,. intern'fie?v e' is ait-ranged,A

o the lowerrnost intermediate l bodyI section,

werf :endo'f gthefshank and each `havn itslower edge constructedintthe form 'of a chisel or cutter; and anenlargement,

collar or stop QOrmed-at-the upper end of the shank Within'the lowermost intermeranged in the form of a cross, as shown in inflongitudinal notches or recesses 21 formed 'in the lower end of vthe, lowermost body section of the. guide tube'and project laterally 'beyond the periphery of :this tube so that the diameter of these blades taken diete body section. .The blades of the bit are preferably four in number" and ar` 17o,

`Fig."4=, and these blades `are arranged withcollectively is greater than thed'ianieter of` the guide tubeon the ottside thereof. During the operation of drillinga hole in the rock the bit rests with its lower or cutting edge upon the rock, theguide tube rests by u per end. of its notcheslon the yblades of the bit, and the frame of the machine and associated partsare Vsupported,

l`by the guide tube,"in which 'position of thesepjarts the lower end of the lowerm'ost b ody"section `is arranged above the lower bitfis ,arranged above the upper edge of .the v lowermost coupling section. Upon starting `the reciprocating engine while the parts arein this position the hammer rodedg'e of the'bitfy and the stop collar ofthe l` or bar will be raised and. lowered cpntinuously and caused to' strike a hammer blpwagainstthe upper end of the bit shank dpring" each downward stroke, wherebyjthe cutting olf-chisel edge of thelatter is"` driven with a cutting action into the surface of thel rock `against whieh` the same rests vin substantially thesame manner in which a *"stone'cutters toolis diivenagainst the surface'of the stone.

` In Order to 'reduce ae aan nhs guide i tube and the hammer rod thisguide tube and. the hammer ybaryare made col'npara-v tive blow against the bit the couplinggsecaround thefperiphery ofthe hammer bar. While the drilll bit issubjected to the blows of the hammer bar the lsaine is also turnedso as to engage the samewith a new part close tively small in diameter, andi in -order to I f y prevent undue lateral ydeiiectionof Athe han1V p mer rod so that the same delivers an eii'ections l15 of the guide sleevehav'e their bores' V'constructed to i fit comparatively of therock for each blow of the hammer v bar and thereby cause thevrock to Abeeut n away in comparatively.- small bitsorchijps A which can' be subsequently easily removed by a strearn'o-E water.` This turning :movement of -th'e bit is `preferably effected thyu 'I mechanism which operates upon the upper cesses lat the lowerk edge ofthe lower body section ofthe lguide tube. @The means for turning `the guide tube and bit which are n part ofthe guidetube sothatthe latter is turned together with the bit which is inter- ,loclrfed therewith by yengagement of the `blades of .the bit with 'the 'notches vor re;

tty-thea dil ha,

shownin Fig. y1,for example, .comprisea f horizontally rotatable gearwheel 22 which hasa hollow hub 23 journaled ini abearing 24 atthe lowerend of Vthe frame rand rei ceiving the-adjacent part ot the upper; guide tube section '12, 'a plurality of upright bolts 25'secured to the lower-side of the gear wheel and arranged in openings formed in ian' annularflange 26 on vsaid guidetube lorffsection', a water motorhaving its casing w27 arranged on the lower'part of themainv 4frame and provided on its driving y shaft 28 witha pinion 29 engaging'with the gear wheel 22, and a'w'ater supply pipe l50 lead-r ing"i..,frornl a pump on the lscow ,or lother motor for 'operating upon" they 'blades cr i p buckets which are. 4securedto vthe' vshaft28 withingthe casing and thereby'turning the ,20 pinion and the parts operatively connected therewith. The gear wheeli. .22 is held .against axial 'movementon the frame by en'- gaging its upper's'ide `with the lower-end of the bearing 24 and wprovidingthe upper vr end ofits hub 23k, with a lateral projecting y e flange 31`which engages` With vtli'eupper end of said bearing, astshovvn in Fig. `1. Whiledisintegration of the' stone or rock `is being 'effected by the blows o f the harn- Inei"A bar against thebit thefchips orpiilverized 'rock resulting from thecutting ac- .tion of the bitis preferably Washed outlor` the i vvhole continuously so as to permit the :bit to v "work ywith-the greatest freedom and elli;-

5.. c1ency. ,For this purpose Water under pressure i isA preferably delivered into the upper I end of the guide tube andconducted down- 1 e y wardly through 'the same and discharged at 4.thelower end thereof adjacent to the cutting 40edge'of thebit, whereby the bits of stone' .are carried upwardly out oftheholethrough theannular space' of the guide tube andl tlfi bore 'of th'euhole tothe "exterior of the roc The discharge of the Water `together with` A V541 the "bits 'ofstone from .the hole )which isz 1. being 'bored is' possible" owing to th'e'f'actjth'at.the',face of the chisel is of' largerv di` panlieterfthan'thatI of the guide tube`,.wl1ere byanfannula'r space of ample dimensions 59- is provided -betv'v'een the guide' tube and, the

watefmotoris connected bya pipe 32 'with f-the`water chamber), as'shown in-"Figi- 1.

H "B'y thisjmeans'fthe pressure water suppliedI I BQafterl having"bee 1i utilized @forI fjtur nig'y the guideltube4 and; *the bit "is from the' outlet" lili'ismotor .r

` chines iin general use.-- For the -purposeoi fplermitting the' hammer rod 'and themotor A dust and chips out of thedrill hole.y The lbody sectio1i`of: the "guide tube. By thus giiiiufiiizea for washing nie-me hammer barand thefbore of the fdii'erent `Sectionsof the guide tube are such'asto i leave an .annular .space between these parts" jwh-ich 1s ample -to provide the necessary 70 passage (for the Wash, Wat

er through i. the

Inr order. toobtain the greatest eI'ective-A ,nessjo'vfthebit on thestone whenthe saine recelvesf the blow of thel 'hammer'. bar the 75 shank of this bit is fitted comparatively snug in the lowermost couplingy section offthe guide tubegandin order toperinit, the pasysageof thewash Water downvvardlybetween thiseshank and the respective coupling sec- 8o tionvl this shank?isprovidedvrith a"A plu- `,rality ofv longitudinalgrooves B3-in. its'pey riphery which serve as passages forthe Wash water through the guide tubetoj'the ,drill l hole.. .As the `kilrilling of the hole bythe bit progresses theweight of the bit and the mac 1 ine restingupon the same`.causes the bit l 'i to. automatically follow up. the surface of "the stonexin* the same measure 'as thilssurface is rcut away'.I underneath'l the .bit., When 'the 90, hole has beendr-illed to the desired depthl the machiney liftedl for disengaging the bitandV guide tube from thehole. and then lowered; A upon another part ofthe rock which is to be .dri11e i,."During this lifting of ih@ bitand 95 guide t'uloe,`the vbit is permitted-to dropl in the guide tube until its stopcollar engages with the upper'end of the lovverinost coupling section :15; the extent of this movement, being s'determined that when the stopy co1- lar engages'lwith this coupling section the upper parts ofthe-blades of the vbit will be still within the notches of the lowermost 1' .Slidably connecting' the bit with the guide tube the blow-'which the bit receives from the lvhammer bar. is not ltransmitted to the' guide tube,'on the contrary, the bit While receiving the blow'is permitted lto advance independently of the -guide tube kv vhile:producing its cutting action er1-the stone; l

lhile'the machine is in operation the gap or clear space between the shank of the bit and the hammer bar inthe separateA position of. these partswis suchthat'l the valve mecha- 115' nism ofthe reciprocating air motor willy continue ,its normal' operation for keeping this engine orfl motor running` i In order to autohammer motor. to descend" in its cylinder an i abnormal extentndthereby'shift theports g"of'-this` rvxiotorfsoas toa-crest the operation of lthis-lnotor7 this action vbeing well known. 125 and similarto that found in thedrilling mapiston'to descend anabnormal distance for arresting the operation of this motor the movement on' -the frame and guide tube isv `sejinounted en the mainframe that it `is capable 4of a Vlimited `dewnward per endof the'shank of the downwardly a sufficient 'extent 'so" as not td interfere 'with the abnormal descent of the; to eiect the, i automatiefstoppage of "the hammer mov-toi'.

hammer har which is` necessary for permitting this longitudinal movement of.A the guide 'tube `relatively to fthe main frame and the engine vcylinder that shown in Fig. 1 consists infarranging the heads 34"`of the bolts 25,'soythat'ja gap is forme'd be-l tween the upperqsid oftheseheadswhen the." `j flange 311of--the'jupperguide tube section is engaged lon 4its upper side by thelow'eryside of the gearwhee1 22,. asshown-inFig. 1.

ponlifting.. .tl-ie.; machine the `guide tube slides downwardlyin the hub .A of the lgear wheel `22 and thefstuiing boxY at the lower f endfof the waterfchamber until the' flange 3110i the'guide tlbeengageswith the heads ofthe bolts 25fwhicl'i latter serve the guide tube `is thus, lowered'reladivelyV to the reciprccating .engine cylinder end of thel cient distance below the lower bar and the hammer barjas" will permit this ym'ot'o'r pistonftodescend an abnormal disy theshank of the bit and `gine will be shifted within its cylinder into a .position in whichair will be-again admitted f tanceandshut*off thelsupply of compressed' Upon again loweringy its bit rests upon the air 'to the. cylinder.` the machine so-that `rock and the `engine frame and .associated parts rest uponthe flange ofthe guide tube,

. the hammerv bar will'be tothismotor for automatically restarting the samewithout `requiring any I mani'pulatio:n

1 for this purpose.

f ed in onepiece for curity being placedwith .its shank within the Fig. 5, which permits' thej'same to be readaol 1 the driven gearwheel '37 `of lthe tube rotating The shanlg` `blades and stoprfjcollar/of the bit shown in Fig. 2f are preferably f :onstruct-` greater "durability and seb and in order` to .permit of this form of it lowermpst couplin'gsection 15 of the guide `tube this coupling section is 'preferably divided diametricallygi'nto two parts, `as shown ily applied to or i/'emoved from theshan'kof thebit.` .In the form of dri ling "the slack` ccnnectibn between the guide vtube `and the cyfnder of the hammer operatingmotor is pr ducedby. permanently connecting tliegilangej` 35'of. the lguide tube 36 with mechanism "and ther lmbvse. f erallyprojeclli normal operation of the .machine is arranged lthisjfgear.wheel with a latenables the upbit,- to' recede pistoni-to descend an abnormal extent and automatically stop the hainr'nerlmotor.v` Au'- n tomatic starting ofthis `e'ngin e o1.. ymotorlv is" f motor 4operated drilling barfrom striking while thesame iS i j 901 but issupportedonthe,guidewubepWhen'f i j f y as stop'lfor blows `.against the bitv "limitmgtheextent ofthis movement. enl

the upper endof the' sha-nk ofthe bit is carried a suiiipushed upwardly by jb the pistenof the en"n nlitted from this air .l Y l 'in various ways, for'lnstance,bythel'means-m l l machine embodying my invention which .is 1shown in Fig. 46

providing theupper A'end of I vent this'bit from ng` flange 39 which during the outo engagement' with ,the upper end of the bearingfloof the hub ofthis gear wheel,

as shown in Fig. 6,;butfwhen themachine is'` `.liftedthev gear 37 .together with the guide `tube 36 will drop until"the flange 35 engages 70 upper end of the'bearing fl'O,"and

:with-the there'bypermit the' of .thei bitte drop away from .thehammer bar a s uiiicientfdistanceto cause the hammer. barlandi motor also effected by again pushing. the guide/tube r upwardly rel in .substantially thejsame kmannerias .d e-l go scribed with reference tothe .constructinl shown in v Fig. formed between;the tor'whi'chfpermits of a movement The slack,"4 eoimection of the. guide tube. relatively `to 'the' g5 reciprocating part ofthemotorhasafurther f unctionin 'that it prevents the f important y A1n engagement with the surfacelof the rock thedrilling. machine is raised sof 'thatthebit ported by the same' saltliat .itisbeyond the while the same at this being broken by-'the'blows '.ofthe .hammer g' Instead of effecting 4th`e tur11ing` guide tube and the bit by meanso I motor, as shown in Fig..y1,.thijs may .beefwhich is mounted on theinclosing'.casing42 v or other stationarypart dfthemachine.soasljy l 1 to be aboye the -"level" ofthe waterwhenifthehv. 11o. f

machine 1s in use. v Motionfmaybetrans motori-to the'guidetube. which-are shown in Fig. 6 andfwhich colinable' bearings o n 4the mainframe and` pro# A vided at its lower end withga'f pinion-809" meshing with the gearwheei 37 and'. ahin 5;. I

zontal shaft 14fjournaled"inl'suitable bearlgf; ings on the upper part'offthe" rfr aiile and* Aconnected by 'ntermeshing bevel gear. wheels 45 in the upper end of the upright shaft and y. by intermeshin'gl spur gear In Figs. 7, 8 and 10 other means are shown f' for permitting the' bit to partake (jf-the lower section of the. gui'detubefand .stillfpqre becoming detached: fro.v the guide tube, these means -qcomprisihgff key 48 arranged transverselyin-"airripening 13y guide tube and the nio- .limited longitudinal @tively @the engine cylinder l o f the I la water fected bv means of an air operated motor.4 1 l' 'limited zlongitudinalfmovement within thejfi f 2 out the loosened stone therefrom.

i in theloweri guide tubev section 49gand pro 1 jecting with its inner part into an annular ygroove f- 50 formed in the yperiphery of the in the tube 'section 49.

For. greater. convenience in assembling f, and dismembering the partseach of the up'- per vcoupling'seetions 54 ofthe vguide tube 1'0"` which :are similarto the sections 15 maybe split diametrically into two parts, as shown .in Fig. 11; f f

independent watersupply pipe 55 may .be` .connected withthe water chamber 156, as ',shown'in 4Fig..6-, for furnishing the neces- 's'ary water which.. passes `from this charnyberdownwardly through the guide tube and intothe drill hole for-removing or washing Instead o f employing a stop collar onvthe v bit, asshown infFig. 2, or a-,keyas shown in Fig.`10, for preventing the bity from be-y v `(':ominggdetachedffromthe guide tube this may beeifected by means' ofinwardly vbent cls iws 57A arranged at the lower end of thef lower guide'tube'section 58 andl projecting I' 61 ofthef'bit is provided with longitudinal d which the drillin machine slides-vertically' across Ihead lidable Ventically?'on the .upper'fparts of th guide. bars and jsecured l to the -r partly underneath .the beveled lfaces o r inclined sides 5.9 ofthe blades of thefbit, as shown in Figs. 12, 13,114, .15 and 16. In

this last ymentioned construction the shank grooves 62 which are in line with the cor` fners-betweeiithe.bladesof the bit andwhich serve as conduits through .which waterf passes from` the fthe. bit" forfwashingxout the stone powder' from'fthe drill hole. 4'0

- for' mountipg this 'drilling machinerso as to' intomor raise thelsfame out of guide tube Ito lthe face) of Although various meansv may be' provided maybe done byli'eans of a derricliwhichis mounted uponfa boat 63 and which comprisestwo upright guide bars v64 `connectedfat their lower ends-,with the sidel of theboat while theirupper end sare braces. 65, a cross'fpieceGywhiehjfconne tsr theilower part Vof he guide barfzmd4 throu' h ame of the .drilling machine, alioi'st ing` cable 68 connected lat one end with the movablecrosshea" l land passing V at its opposite-'end around a hoistingI drum69 mounted '.-theh inggcab l profe fly., of s h heft' as-.will

i v-on the-lower part'ofthebraces whilev its in' tennedi'ate"part 'passes around a' guidegpul-.

ley attire uppr end'of the brace'sf'and af counterbal ncmg kweight k71k 'connected z with The counter? `weight permit drilling'imachine to'descend'b gravi t Same-'$9'bariedmm'ami the' dauin@ @Chine when usingthe-diuing leachate' foiledy ing upwardly the-#same may bemounted'on a dei-rick similar toithat whichy is .shown in Fig. '19 andwhicli comprises a ibase 72`,"an

is capable ofsliding up and down, a. ibrace 74 pivotally connected at'itsvtupper end `with I the upright-'guide and connected-for -h'ori- .When an air operated *motor is .employed .forrotating the guide tube and drill bit an zontal adjustment atits lower-end with the -'base, a hoisting cable 75. connected `with the? .drilling machine;y andQat,` one `end with a hoisting drum 6 mounted on the' guide 'while its intermediatepart passes around a guide pulley" 7 7 arranged 'at the upperljend 'ofthe brace, and a lifting weight`78 connected with the othei` end of. the `hoisting cable and operating normallyvto automatif cally lift the drilling machine solas to `vfeed the bit upwardly as :the vvdepthfofj the hole increases." By turningithe drum 76 vTthe drilling lmachine may be lowered: 1 i

It willibe notedthat my improved drilL ing machine is comparatively liglitand can bel be readily handled vwith little labi"'and"that 4 theksamep'ermits of drilling holes in' rocks rapidly and without'lia'billty of forming large chips or becomingcaught 'in thehol'e,

and means for actuating. said' hammer bar. 2. A drilling machine comprising a Ibit adapted'to engage the. surface tov be drilled,

ahammergbar for operatings'ai'd bit, al guide tubein which saidbit and-bar arelarranged,

'and which is adapted to enter the' drill hole,

Vmeans for actuating said hammer bar, and

.l means for turning,.slid,bit`.v l

.3..HA drilling' hadapted to wengage tu, ,li-rfbe'tobe drilled, f a hammerbar for-'operating said" fit', 1 -guide 9 tube in which b itand bar are` arranged, 1 andiwhich is adaptedto enter theV drill hole,

"Emeans for forcing a clearing .ffluid' .said Hfrom the hole the pulveriizfedylgmaterial -liformed byg-the bit.

through 4.- A drilling machine ,compri ing tube, whichfis adapted to enterl the drill. end of .said

fhole, abit guided on the low'enI tube,fa hammer bar for operating L4said-'bit tuating said-bar.l 5. `Azdrilli'rig machine-comprising agguide vtulgep- 'which isv adapted to the p ldrill means for actuating said hammerjbar, and.

guide" tube to said 1 bit for removing.

thereby effecting a material savilngsinthe and which is adapted toenter the' drill hole," i

ha@ @mfp-liana bit.

arranged lwithin said'tub'e, and means: for Y ing partand arranged WithinA said tube, a

` to saidry lreciprocating part, and. a drivingl pendently of said bitmeans for' reciprocat- 10. ingsaid bar for causing the same to strike i i tor having a frameand a reclprocatingfpart, a guide tube mounted on:` said frame, a ham-jh andmeans v:bit mounted onl saiddtube and operatedby saidbar, a driven gear Wheel connectedwith 'said vtubewand having its-lull),A mounted onlA said" frame so asto "be incapable ofaa limited longitudinallyl sliding moyement relative pinion meshing with' said-gear Wlheel 20. A drilling lmachine comprising' a1momer lvbar connected ,with saidi'reciprocating i part land'arranged Within said/tube, -a bit mounted o`n said tube landoperated by `said i bar, a driveh gear-Wheel connected With said tube and having itsI huby mounted ,on "said:

frame' solas t'o bei'ncapable' o'fu axial movevment Vrelatively to lsaid reciprocating part, Ia drlving pinion mounted on s'ald frame and fmeshing /With said gear wheel, andi means' for c ausin'gsaid tube to'turn With saidgear 'Wheel but permitting a -`limited longitudinal movement of the tube relativelyvto :said whee1."'

l A machine 'comprising a mo- L tor havinga frame and a reciprocating ,part

a guide tube mounted on `said trama-ia ham- Ymer bar connectedl -With said reciprocating partdand arranged Within said tube, a bit A `'n iounted lon said. tuberand operated by said bar,`a driven gearlwheel connected .with said tube' andl havlngl its hub mounted-on said .frame'sos to be inc'apable'of axial move;

ment relatively toy said reciprocating part',

ai driving pinion mounted on said frame and lmeshlng lwith saidY gearfwheel, and means `or causing said-*tube to Iturnfwith Y saidv gear v- 'wheel but permitting aflimited longitudinal movementl of'l the', tube relatively to said wheel. comprising a' plurality: o'f`longitudinal boltsl secured tothe gear Wheel and pass;

" movement'independently lof? s `ing through a flange 'onsaidgilide tube. prising y"a;

i 22., A drilling; machin' n guide/tube, a bitlgui'ded on t the` tube so as to be capabl a hammer bar guided in i'afd'tube, 'indey pendently of saidbit,

``1'originanmi,.4 aid tube and;

'Y said bit intermittently and .means\for turning said-tube andbit in unison.

23. AA drilling machine comprising 1a Mguide tube, a .bit guided-on thev lower end of the tube so as to be capable of longitudinal movement independently of said tube and y. .adapted to rest onfthe surface to be drilled,

a hammer bar guided in said tube, inde- .ahammer bar guided insaid tube,y independently of said bit, means jfor reciprocati ing said bar for causing the same to strikev said bit intermittently While the .latter rests continuously on the surfaceI being drilled, and means for turning theguide tube and bit during. the "drillinglf operation.

25. A `vdrilling machiner comprising a guide tube-providedlat intervals Withfinternal reduced bearing portions, a hammer bar arranged in the guide tube and engaging said bearing portions, and a-bit mounted on the guide tube and adapted to receive Vblows from rsaid: hammer bar. i

26. A ldrilling machine comprising a 'bit having a yreduced shank, an enlarged collar vat the inner end ofthe shankfand' blades f at theouter end of the shank, a split guide tube section embracing -saidshank andkhav- "ing the internal diameter smallery than said collar and blades,"a non-.split guidetube, section on which' said' split tube section is mounted, means-for rotating said guide tube sections, and a' hammerbar reciprocating in jsaid tub'e sections andengagng saidbit.

Witness vmy han/d this 23- .day of May, v14912-.,. "`v v HARRIS T.,DUNBAR. l

THEO'. L. Porr,

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