US2670931A - Apparatus for drilling holes for roof anchors - Google Patents

Description

March 2, 1954 J. c. CURTIS APPARATUS FOR DRILLING HOLES FOR ROOF ANCHORS Filed Jan. 20, 1950 4 Sheets-Sheet l 1223 627202: JOZ222 6?;2 22'5 ai'arzzey.

J. C. CURTIS March 2, 1954 APPARATUS FOR DRILLING HOLES FOR ROOF ANCHORS Filed Jan. 20, 1950 4 Sheets-Sheet 2 [223622202 Jafin 662121325.

March 2, 1954 J. c. CURTIS 2,670,

APPARATUS FOR DRILLING HOLES FOR ROOF ANCHORS Filed Jan. 20, 1950 4 Sheets-Sheet 5 VAWAY/AWAY/A A ,gvu '5 Agra 44;

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J. C. CURTIS March 2, 1954 APPARATUS FOR DRILLING HOLES FOR ROOF ANCHORS 4 Sheets-Sheet 4 Filed Jan. 20, 1950 Patented Mar. 2 1954 u NIT so: S TATES PATENT 0F F I CE APPARATUS FOR DRILLING'HGLE'S FOB; ROOF ANCHORS John 0.. Gums; Claremont, No H.', assignor to Joy Manufacturing?" Comptmy; Pittsburgh,- Paid; at: corporation of Pennsylvania Application Jenner-v20, 1950, serialize; 139,612

1 16 Claims. This invention relates to mobiledrilling apparatus and more particularly to anim-proved mobile drilling apparatus especially designed for use in drilling upright'roof holesi n underground mines: or tunnels, for receiving roof anchors.

In mines or tunnels where roof control is eifiected' by internal suspension type roof anchors which are set in the roof strata, upright holes are: usually drilled in the roof for receiving the anchors. In underground mines or tunnels where head room is relatively low, roof holedrills of known types are too-great in length to enable roof drilling in the restricted spaces encountered, and particularly when conventional stoper type rock drills are employedfior' drilling the roof holes the head room mustbe relatively high to accommodatethe drills. In roofdrills of other" known types the drills are relatively heavy and complicated and while certain types may operate where relatively low headroom is present they are relatively" expensive and usual ly require more: than one operator; thereby increasing the cost" of roof control. The present invention contemplates improvements over suchlmown'ztypes of roof? hole drills in that a relatively simple: and compact drill structure-is pro-- vided which is readily mobile and which may loc operated by a single. operator; and: due to its'ver tical'compactnessi may drill upright roof holes of substantial depth mines or tunnels having lbwheadi room. Thus the cost of: drilling roof holes in. low coal or in. tunnels: havinglovv' head room may be maintained at a The drill or the present invention; is oi.v the priedmainc impact type: mounted on; a; moh'ile base roof strata of underigromid mines or tunnels.

Yeti anothert'ohjeot is'to provide an: improved drilling" apparatus oftheipn'eumatio impact-type which isextremelyvertioallivfcompact? and which has? a relatively long range: ofvertical feed for' its height thereby enabling? use of the 2 mine pessagewaysor tunnels having'head room ofvarying heights. A further object is to provide arr ir'np'roved mobile mounting for a pneu matically fed hammer drill of comparatively 1 short length and having an auxiliary feeding means whereby the feeding travel of the drill may be materially lengthened; A still further object is to provide" an improved drilling a'p'pa ratus having a pair of feeding devices which may act cumulatively to provide a relatively long feeding travel of the drilling implement. Still another object is to" provide anv improved rock drill feeding mechanism. of the pressure fluid actuated cylinder and piston type-wherein a plurality of coacting cylinder and piston devices, arranged and mounted in a novel mannor, are employed.- A further objectis to pro= vlde: improved" reels drill feeding mechanism of the: n'lulti-eyli nder'type wherein the feed cylinders' may cooperate to feed the drilling tool toward the work; thereby cumulatively to provide arelatively long feeding" travel. Still another object is to provide an improved hammer rock drill of the wheel mounted stoper type.

'l hese and other objects and advantages of the invention will, however; hereinaiter' more fully appear;

in the aceompanyioedrawings there is shown for porposes'oi illustration one form which the invention may" assume in practice.

In these drawings:

Fig. li-is a plan v'iewoii a root anchor hole drill constructed in accordance with an: illustrative embodiment? of the invention.

Fig. 2 1's 2; side: elevational view of. the drilling apparatus shown in Fig. 1; with a art of the carriage iramebroken away and indicating the transport position of the apparatus in dotted lines.

Fig: 3 isan. end view or the drill apparatus Figs. l anclz, witha laterally tiltedz'pd' sition of the drillin vtool indicated dotted lines.

Fig; 4 is a detail vertical sectional View taken orr'lir-ie' 1-4 of- Fie. 5, showing the" secondary feed for the drilling'itool.

Fig. i'san enlarged vertical sectioiial view takeiron-line 5-5 or Fig. 1, showing the drilling tool in position preparatory to: drilling.

Fig; e is a detail vertical sectionalvievv taken i online fi- -fioii Fig. 5. I

Fig 7Iisa detairseotional view taken: on line L-E oiFigt 5 Figs-81- is a sideelevationat view the near wheel removed. showing the primary arid sec While signed for use in drilling upright holes in the.

roof, exidently, holes maybe drilled at other locations and features of the invention may be embodied in drilling tools ofother types.

The improved drilling apparatus, as shown in the drawings, comprise a mobile base in the form of a two-wheeled carriage having a generally 'L-shaped, open-sided frame 2 herein desirably of a fabricated, welded, tubular construction. The frame 2 includes a longitudinal tubular side portion 3 and a transverse end portion 4, and the latter includes U-shaped frame portions or wheel-yokes 5 each carrying an axle 6 on which a rubber-tired wheel i is journaled. The side frame portion 3 is welded to one of the U-shaped axle frames 5 and the transverse portion 4 includes a transverse cylindrical bar or cross tube 8 extending horizontally between and welded to the U-shaped axle frames 5. The cross bar 8 is arranged parallel with the wheel axes in the manner shown. The longitudinal side frame portion 3 ofthe carriage frame has near its outer end a lateral boss 9 welded to its inner side and arranged in a vertical opening in this boss is an upright rod |G provided with a handle The rod has a pointed lower end It and is adjustable vertically in the boss bore and its pointed end is engageable with the ground or floor as shown in Figs. 2 and 3 for supporting the outer end of the carriage frame. A set screw 3 having an operating handle I 4 is threaded within the boss and is adjustable into engagement with the rod for securing the latter rigidly in adjusted position. The handle may be grasped by the operator for tilting the carriage frame into-its transport position (as shown in dotted lines-in Fig. 2) and for moving the carriage over the ground or floor in an obvious manner. The outer end of the tubular side portion 3 of the carriage frame has a detachable connection |5 with an air supply hose i6 and the side frame due to its tubular construction provides a constant pressure chamber for the pressure fluid supplied to the apparatus, to reduce pressure fluctuations in the air line. i

In this illustrative construction, as shown in Figs. 1 and 6, arranged centrally between the ends of the cross bar 8 and located between spaced collars I8 welded to the bar is a pivoted support orclamp l9 which surrounds and is pivotally mounted on the cross bar. One of the collars, as shown in Fig. 7, has a threaded boss 26 for receiving a set screw 2| provided with a pivoted operating handle 22. This set screw acts on a clamping block 23 mounted in a recess 24 in the collar and this block has its inner gripping face engageable with a plane face 25 of a flange 26 on the clamp. The collars i8 have spaced abutment lugs 25 and 29 engageable with a stop pin 36 carried by the clamp for limiting the piv-:

otal movement of the support I9 about the axis of the cross bar as later explained. By tightening the set screw 2| the block 23 may be brought into gripping engagement with the plane face 25 of the clamp for locking the latter in its desired position of adjustment. The clamp-frame has a longitudinal bore 3| which receives a longitudinal bolt 32 having its head 33 engaging the outer surface of a swivel plate 34. The clamp i9 has a plane face 35 with which the inner face 36 of the swivel plate 34 is engageable, and a nut 3? threaded on the bolt, when tightened, moves the faces 35 and 38 into tight frictional engagement to lock the swivel plate 34 in adjusted position about the longitudinal axis of the bolt 32. When the pivoted clamp or support 19 is in its position shown in Fig. 5, with the stop pin 33 engaging the abutment lugs 28 on the spaced collars I8 and with the gripping block 23 set in gripping position, the swivel plate 34 is in the vertical position shown; When the bolt 32 is loosened the swivel plate 34 may be swung in transverse planes about the bolt axis relative tothe clamp I9.

The swivel plate 34 has a depending frame portion 39 provided with a step-like bottom portion 45 to which the lower end of a vertical pneumatic feed cylinder 4| is secured, as by welding or otherwise, at 42. Contained in this upright cylinder is a reciprocable feed piston 43 having its piston rod 44 extending upwardly through a packed top head 45 of the cylinder,

and this piston rod is rigidly secured at 46 to a cross plate or yoke d1 (Figs. 4 and 5). The cross plate or yoke t! is connected by side rods 48 which extend downwardly in parallelism along the sides of the feed cylinder 4| and which are secured at 29 to lateral lugs 59 integral with a sliding frame or cross head'iil guided on the exterior periphery'of the feed cylinder 4|. Secured to the sliding frame 5| is a depending frame portion 53 having a bottom stirrup 54 to which the lower end of a vertical piston rod 55 is rigidly secured at 56. This piston rod extends upwardly through a packed lower head 5'! of a rec procablewertical pneumatic feed cylinder 58 and secured to the upper end of the piston rod is a feed piston 59 contained in the reciprocable feed cylinder. During feed the stirrup 54 has a bottom surface 60 adapted to rest upon the floor. or ground surface when the feed piston 43 is in lowered position as shown in Fig. 5. The cylin-' der 58 is arranged in parallel side by side relation with the cylinder 4!, and the cylinder 58 has an upper head- 53 provided with a lateral bracket 54 herein desirably formed integral with a front chuck housing of a conventional pneumatic hammer drilling tool generally designated '56. This drilling tool is herein arranged in parallel side by side relation with the feed cylinder 58 and includes a conventional pressure fluid actuated hammer motor having a cylinder 67 secured to the chuck housing and containing a usual hammer piston (not shown) for percuss-ively actuating a drill steel 68. The drill steel 68 has its shank receivable in a conventional chuck within the chuck housing 65 and the upper end of the steel carries a conventional drill bit 69. The motor cylinder has a rear head block 10 secured thereto and this block carries a conventional throttle valve mechanism H which is adapted to control fluid flow to the drilling motor and to the two feed cylinders 4| and 58. Projecing laterally from the motor cylinder as shown in Fig. 3, is a handle 72 having a grasping portioni3 which carries a conventional feed vent valve mechan sm 14 which is adapted to regulate the feeding pressure in both feed cylinders. A sup airmen plypipe 76. has a lateral connection-with thetubul'ar side frame portion. 3: of the carriage whereby fluid may be conducted from the-constaut. pressure chamber tea pipe L l which has a detachable connection at 181 with ona'end of a conventional line oils]: or: lubricator; 19L. Detach:- abIy connected at: at with the: opposite; endot the: line oiler' is an elbow 81 whichhas'oonnection at. 82. to a flexible hose 8.3 which leads to the: inlet chamber of the throttle valve mechanism ll inia well-known manner. The throttle; valve: mechanism controls the flow of pressure fluid through apassage 84 (Fig;v 5 which: communicates with the upper end of: the feed. cylinder 58 above the piston 59. The throttle valve mechanism: also controls the now of fluid through a passage (not shown) in the handle: it which is connected. by a flexible hose 85 to a. passage 86: (Fig; 5) inthe step-portion 4B of the swivel plate 34,. and: the passage 813 communicates directly with they lower" end. of the cylinder '11 beneath the piston 43 as shownin Fig. 5. Thus; the throttle valve mocha: nisnr H may control the fluid supply to bothv feed devices: to effect feed and the vent valve mechanism. 13. may effect venting, of both feedingdevioes to regulate the feeding pressure;

When the set screw 2| is loosened to effect release of the clamp block: 23- the pivoted. support or clamp is may be swung about the longitudinal axis. of the crossbar 8 to locatewthe drilling: tool in the desired position, and during, transport-o1 the apparatus the stop pin 39: onthe. clamp engages the abutment lugs 29 on the collars tit to locate the drilling tool inits transport position. as indicated in dotted lines in Fig. 2. When thev bolt at is loosened the swivel plate 35 may be turned about an axis at right angles tothelongitudinal: axis of the cross bar tov locate-the frame. 39- and. drilling tool inthe desired lateral tilted position relative to the carriage frame, as indi catedin dotted lines. in Fig. 3-, and the bolt 32 may thereafter be tightened and the gripping block 23 be set to secure.- the parts firmly in adjusted position. The drilling: tool may be swung horizontally about either of the vertical axes of the parallel feeding devioes;. a-ndtoaccomplish' this the operator may grasp the handle '22 toeffectswinging of. the tool. with the: cylinder 53. about the axis of the piston. rod-Biandi with the frame 58 about the axis: of the-feed. cylinder at; The handle 52' may also: begrasped-by the operator to hold the drilling tool steady during the drilling operation By arranging the: feed cylinders.- ll and and the; drilling. took in the manner disclosed extreme: vertical, compactness is; attained while by concurrently operating-the feeddevices: a oumuiativefeed of. relativelygreat length may be provided. Byv providing. thetcar riage frame with an open; side, theoperati'on' of the tool. is facilitated, particularly the- 0p.- erator is kneeling on the floor. minesor'tunnel's having low head room. v The general mode-cf useof' the improved drill-'- ing apparatus is as follows: 1

During transport of the apparatus about the mine. or tunnel, the pivoted clamp-or support !9 isswung relative to the. cross bar 8' into the: position shown in dotted lines in Fig. 2:,. with the feeding means and the drilling. tool in SllbStBflI- tia-lly horizontal, lowered; positions on the cart-- riage, and the. operator may hold; the" carriage frame in raised. position from: the-floor-by grasp-'- ing; theihandlei i. or: the tubular sideframe. 3- of the: carriage so:- thatillhfi apparatusamaybe rolled along the: floor on ground surface; Thus;

grasping the-handle lflorlthe tubular side; frame ofthe carriage: the drilling: apparatus may be readily movedfrom place to place by the operator even when: the 'headiroom is relatively low; When it is desired to" drill an uprightv holev in the. roof strata the clamp 23 may be released and the clamp or support I 9 may be swung-about its pivot. on the cross bar 3 until the stop. pin 30 on the cl'ampengages' the collar-lugs 28 on'the cross bar, and thereafter the clamp may be tight-.- ened: to secure the clamp firmly to the cross bar. By" loosening the clamping bolt 32 the swivel plate 34 may be swung: in transverse planes about the. bolt'ax-is to locate. the drilling tool in the desired lateral position,. either in a vertical position or in positions inclined with respect to the vertical'as desired, and thereafter the bolt 32' may betightened to. lock the parts firmly in position. When the drilling tool is. in the vertical drilling position shown in full lines in Figs. 2 and 3; the sliding frame 5| may be lowered relative to. the cylinder t l to'bring the bottom surface $0.01? the stirrup 5 into engagement with. the ground surface: or" floor as shownv in'Figs. 5 and 9. The shank of the drill. steel 68- may then be inserted in the chuck of. the drilling tool with the drill bit fial'ocated just: below the roof level as shown in Fllgad when the apparatus is operating under low head room. The fluid. supply hose. it, which to any suitable source of fluid under: pres sure, may'then be attached by the connection l5' to the outer end the: tubular side frame 3' of the carriage, and. the throttle valve mechanism. H of the. drilling tool: may then be. manipulated to effect fluid. supply to the hammer motor to cause percussive actuation of the drill: steel '58; When the parts are in the position shown in Fig. 5; with both feeding means. fully collapsed as shown, the throttlevalve mechanism 1! may be positioned. tdeffect fluid supply through the passage 8* to the feed; cylinder 5.& and concurrently through. the. passage; in the handle l2 and the hose connection (iii to the feed. cylinder: M. pressure fluid-flowing tothe feed cylinder 48- above: thestationary piston 59 will eflect move ment of the cylinder upwardly moving the drill-- tool therewith. thereby to feed the drill steel up toward: the roof,. and as the drill bit 69 fed: upwardly and as the drill steel' is; percussively actuated, vertical hole: is drilled in'the. roof stratazas shown: Fig. 9. If the deeper holesis desired under the low head: roomv shown the feed.- ingmeans: may be retracted and a. longer'drill steel. may be substituted: for the one shown. When the head room is substantially higher as shown in. Fig 8;, and the: feed: cylinder Eili's. fully extended, the pressure fluid. flowing to vthe'sstastianary feed cylinder ii below the feed 'pistorr id wiili movethe: latter upwardly in the: cylinder continuingv the feeding of the. drillbit upwardly as the hole-deepens. Asthefeed piston it: moves upwardly the feeding device 58,. 5'9, together with the drilling tool, move upwardly therewith and at that time the stirrup 54=-no longer rests on the ground surface or floor; The sliding guide frame 58- as it moves along the feed cy rider -iprovides an adequate guide for the drilling tool at this time. In Fig; 8, both feeding means are shown in fully extended position.

Earring: the. drilling operation the operator may the handle portion. of the" handle. l'2i to i1oid-.-tlie drilling tool; steady;. and prior to the starting. of-the: hole the: operator: may swingthe drilling toolzlaterally into different angular-post tions about the: parallel axes of the feed cylinders H and 58, as shown in full and dotted lines in Fig. 1, to obtain the desired tool location. As the drill bit 69 is fed upwardly toward the work during the drilling operation the vent valve mechan sm 74 may be operated to vent fluid from the feed cylinders thereby to regulate the feeding pressure. When it is desired fully to retract the feeding means the throttle valve mechanism 1| may be positioned to cut off the fluid supply to the feed cylinders and the latter may be vented to atmosphere. The two feeding devices, as above described, act cumulatively to effect a long feeding travel of the drill bit, but yet may be collapsed to provide an extremely vertically compact structure well adapted to conditions where the head room is low. Evidently, when upright holes in the roof of greater depth than the height of the mine or tunnel are desiredit will be necessary to use sectional drill steel in a well-known manner.

As a result of this invention an improved mobile drilling apparatus is provided which may be readily moved about a mine passageway or tunnel and may be quickly set up into and firmly supported in drilling position. By the provision of the novel feeding structure disclosed, an extremely vertically compact drill is provided especially designed for use in drilling upright anchor holes in the roof strata of a mine passageway or tunnel having relatively low head room. The drilling apparatus is not only readily mobile and extremely vertically compact but is also simple and rugged in design, well adapted to the purpose for which it is intended. By the provision of the primary and secondary feeding means arranged and mounted in the compact manner disclosed a relatively long feeding travel of the drilling tool is attained. The drill structure, due to the novel compact relationship of the two feeding means and the drilling tool, is of no greater height than a standard single feed type hand-held stoper drill which has not more than one-half of the feeding travel of the drill of the present invention. The novel wheeled carriage for the drilling tool provides a stable support for the drilling tool during the drilling operation thereby substantially relieving the operator of the necessity of manually supporting the drill and due to its extremely light weight and compact arrangement the carriage may be readily moved through the restricted spaces encountered in an underground mine or tunnel. These and other manners of use and advantages of the invention will be clearly apparent to those skilled in the art.

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a drilling apparatus, a base, a frame carried by said base, a vertical feed cylinder secured at its bottom to said frame, a feed piston reciprocablo in said feed cylinder and having its piston rod extending upwardly through the upper end of said cylinder, a frame surrounding and slidably guided on said cylinder, a connection be tween the upper end of said piston rod and said sliding frame, a piston havingits piston rod secured at its lower end to said sliding frame, areall.

ciprocable cylinder containing said last mentioned piston, and a drilling tool carried by said reciprocable cylinder.

2. In a drilling apparatus, a drilling tool, a fluid actuated feeding means for said tool comprising a stationary upright cylinder, a piston reciprocable in said cylinder and having its piston rod projecting from said cylinder, a sliding frame guided on said cylinder, connection between said piston rod and said sliding frame, a second piston arranged parallel with said first mentioned piston and having its piston rod secured to said sliding frame, and a reciprocable cylinder containing said last mentioned piston and by which said drilling tool is carried.

3. In a driling apparatus, a drilling tool, and fluid actuated feeding means for said tool comprising a stationary upright feed cylinder, a reciprocable feed piston contained in said cylinder and having its piston rod projecting from the upper end of said cylinder, a sliding frame guided on said cylinder for movement therealong, connections between said piston rod and said sliding frame, said sliding frame having a downwardly projecting step portion, a second feed piston arranged parallel with said first mentioned piston and having the lower end of its piston rod secured to said step portion of said frame, and a reciprocable feed cylinder containing said last mentioned feed piston and by which said drilling tool is carried.

4. A drilling apparatus comprising a frame including a horizontal cross frame member, a support carried by said cross frame member and mounted to swing in vertical planes relative thereto, said support having a depending portion extending downwardly below said cross frame member, a vertical feed cylinder secured at its lower end to the bottom of said support portion, a member slidably guided on said feed cylinder for movement longitudinally therealong and having a depending frame portion provided with a bottom stirrup, a piston reciprocable in said vertical cylinder and having its piston rod extending upwardly through the top head of said cylinder, connections between the upper end of said piston rod and said slidably guided member, a parallel piston rod secured at its lower end to said bottom stirrup providing portion of said slidably guided member and having a piston at its upper end, a reciproca'ble cylinder in which said last mentioned piston is contained, said last mentioned cylinder having an upper head portion, and a drilling tool adapted to actuate a drilling implement and arranged in parallelism with said last mentioned cylinder, said tool hav ing its upper portion secured to the said upper cylinder head portion.

5. A drilling apparatus as set forth in claim 4, wherein said stirrup providing portion when said first mentioned piston is in its retracted position engages the ground and said drilling tool when said reciprocable cylinder is retracted is disposed below the top of said first mentioned feed cylinder.

6. In a driling apparatus, a base, a vertically disposed drilling tool, a pair of coacting feeding devices mounted in vertical parallel relation on said base for feeding said tool toward the work, each of said devices being fluid actuated and comprising relatively reciprocable feeding elements, with the reciprocable element of one de-' vice supporting said other device, means for supplying pressurelfiuid to said feeding devices to cause said devices to act cumulatively to feed disposed drilling tool, a pair of coasting feeding vices ;;,moun ed in vertical para el relation: on said base for feeding said tool toward the Work,

each of said devices being fluid actuated and comprising relatively reciprocable feeding e lewith the reciprocable elemer'it(if one device supporting said other device, means for supplying pressure fluid to said devices to cause said devices to act cumulatively to referred (z;

and said tool carried by the reciprocable element of said other device at one sid of the latter in parallelism therewith, and sa1d t6ol mbunted on" said feeding devices freely t'oEwi'ng laterally about either the parallel vertical axes of said devices, into different lateral drilling positions relative to said base, one of said feeding devices swinging laterally with said tool during swinging of the latter about the vertical axis of said other device, and said tool having a handle projecting laterally therefrom and adapted to be grasped by the operation for swinging said tool about either of said parallel axes and for holding said tool against such swinging movement about said axes during the drilling operation.

8. In a drilling apparatus, the combination comprising a supporting frame, a vertical feed cylinder mounted on said frame, a piston reciprocable in said cylinder and having a piston rod projecting from said cylinder at one end thereof, a ground engaging bottom support having connection with the projecting end of said piston rod whereby said piston may raise and lower said bottom support with the latter guided during its movement by said cylinder, said support when said piston is retracted resting directly upon the ground, a piston rod arranged in parallelism with said first mentioned piston rod and secured at its lower end to said bottom support, a reciprocable feed cylinder in which said last mentioned piston is contained, a drilling tool adapted to actuate a drilling implement and arranged in parallel side by side relation with said reciprocable cylinder and secured to the latter with the upper ends of said reciprocable cylinder and said tool substantially coplanar at right angles to the direction of feed of said tool, and means for supplying pressure fluid to said cylinders to cause said reciprocable piston and said reciprocable cylinder cumulatively to effect feed of said tool.

9. A drilling apparatus as set forth in claim 8 wherein, when said support is resting against the ground and said reciprocable cylinder is retracted, said reciprocable cylinder has its upper end disposed a substantial distance in advance of the lower end of said first mentioned cylinder and the upper end of said reciprocable cylinder moving upwardly above the upper end of said first mentioned cylinder when said reciprocable cylinder is in its most advanced position.

10. In a drilling apparatus, the combination comprising a frame, a vertical fluid cylinder secured at its lower portion to said frame, a pisa drilling apparatus, a base, a vertically i c lin e and hal g sci i t a s 19.

O '1 plem s d .r ralle'l' "ans U 13' 1, 11 an having its piston rod ,seouredfto sal ed time, and" a rasibaab1"ty1aar' containing said last mentioned piston and by which said drilling tool is carried.

12. In a drilling apparatus, the combination comprising a drilling tool adapted to actuate a drilling implement, and fluid actuated means for moving said tool axially in a vertical direction comprising a stationary upright fluid cylinder, a reciprocable piston contained in said cylinder and having its piston rod projecting from the upper end of said cylinder, a frame guided on said cylinder for movement longitudinally therealong, connections between said piston rod and said guided frame, said guided frame having downwardly projecting step portion, a second feed piston arranged parallel with said first mentioned piston and having the lower end of its piston rod secured to said step portion of said guided frame, and a reciprocable fluid cylinder containing said last mentioned piston and by which said drilling tool is carried.

13. A drilling apparatus comprising, in combination, a support, a frame adjustably mounted on said support and having a depending portion, a vertical fluid cylinder secured to said depending frame portion, a member guided on said cylinder for movement longitudinally therealong and having a depending frame portion provided with a bottom stirrup, a piston reciprocable in said vertical cylinder and having its piston rod operatively connected to said guided member,

-, a parallel piston rod secured at its lower end to said bottom stirrup providing portion of said guided member and having a piston at its upper end, a reciprocable cylinder in which said last mentioned piston is contained, and a drilling tool for actuating a drilling implement and arranged in parallelism with said last mentioned cylinder, said tool having its upper portion secured to the upper portion of said last mentioned cylinder.

14. A drilling apparatus as set forth in claim 13 wherein said stirrup providing portion, when said first mentioned piston is in its lowermost retracted position in said vertical cylinder, engages the ground and said drilling tool, when said reciprocable cylinder is retracted, is disposed below the top of said first mentioned cylinder.

15. In a drilling apparatus, the combination comprising a supporting frame, a vertical fluid cylinder mounted on said frame, a'piston reciprocable in said cylinder and having a piston rod Tnnomt n qm id. ylihfifi ti nl iifi k a r und en a n h iq mla p rt. havin 9 .nnept ion with the pgojgqtigg end 0f said gist' gn rod whereby said pistq n ma y raise grid lower sa d bq mr p r h e at r. uid 9 5- ing its movement by said gyliqder said bottom support. when said;pi ston is lqwered, insaicl cyli ex" st i c xu n th P QELDB' QP jpd agganged in parallelism-with saiq first; mgntioned; piston rod and secm ed at itsylp w ergnd to said bottom suppoy t g reclprocable fluid cyln dn nl hmhn aid. 1 ment ed ton njjgainegl drillingtopl adapted to actuate a drill- 'ina implement and alfia ed in parallel side hy V ;sid.x 1 ti0 .w. a r q mqp b i d r an 'a szu d t th at rr i hr't ndlspi aid fiieqipropable (:ylindepapcl said tool at substanti l y. t s mefi el n me s $9 u p in re ure, u o aid. der o PM? 53 r eciprppable piston, and said -l epiprocablecylind lnr umu ati yp effect xia mqvqm n 19 a s l l- 1v 16 A glrilling appayatus asset forth-,inplaim

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