US2015677A

US2015677A - Drilling apparatus

Info

Publication number: US2015677A
Application number: US598759A
Authority: US
Inventors: Morris P Holmes
Original assignee: Sullivan Machinery Co
Current assignee: Sullivan Machinery Co
Priority date: 1932-03-14
Filing date: 1932-03-14
Publication date: 1935-10-01
Anticipated expiration: 1952-10-01

Description

Oct. 1, 1935. v

DRILLING APPARATUS Filed MaICh 14, 1932 5 Sheets-Sheet 1 lil,

M. P. HoLMi-:s 2,015,677

M. P. HOLMES 2,015,677

'DRILLING APPARATUS Filed March 14, 1952 3 sheets-sheet 2 kwin. %\k\ Oct. 1, 1935.

m .mm Hw Auf Auf mol. NM :Hmm Vm AY MNH MHV KW WQ HTT'K Oct. 1, 1935., M. P. HOLMES 2,015,677

DRILLING APPARATUS Filed March 14,y 1932 3 Sheets-Sheet 3 /n' VEN Ton /Vo/m/s f? HOL M56. A@ ,4' mw HTTK Patented Oct. 1, 1935 PATENT OFFICE DRILLING APPARATUS Morris P. Holmes, Claremont, N. H., assigner to Sullivan Machinery Company, a corporation of Massachusetts Application March 14, 1932, Serial N0. 538,759

16 Claims.

This invention relates to drilling apparatus and more particularly to improvements in coal drilling apparatus particularly adapted to use in conjunction with coal mining apparatus.

An object of this invention is to provide an improved drilling apparatus. Another object is to provide an improved coal drilling apparatus particularly adapted to be mounted on and used in conjunction with a coal mining apparatus. A further object is to provide an improved drilling apparatus having improved adjustable supporting means for the drilling tool. A still further object is to provide an improved coal drilling apparatus of the multiple drilling tool type having improved independently ladjustable supporting means for the drilling tools whereby the latter may be positioned in various locations relative to the coal face. Still another object is to provide improved means for mounting the drilling tools on the coal mining apparatus and improved means for driving the drilling tool from the motor of the mining apparatus. Yet another object is to provide improved means for mounting the drilling tools on thecoal mining apparatus whereby the drilling tools may be independently adjusted both vertically and horizontally relative to the mining apparatus. These and other objects and advantages of the improved mining apparatus will, however, hereinafter more fully appear.

In the accompanying drawings there is shown for purposes of illustration one form which the invention may assume in practice.

In these drawings:

Fig. 1 is a plan view of a coal mining apparatus having associated therewith the illustrative embodiment of the improved drilling apparatus;

Fig. 2 is a side elevational view of the apparatus shown in Fig. 1;

Fig. 3 is an enlarged horizontal sectional View taken substantially on line 3 3 of Fig. 2, parts being shown in plan tofacilitate illustration;

Fig. 4 is a transverse vertical sectional view taken substantially on line 4 6 of Figs. l and 3;

Fig. 5 is a detail sectional View taken substantially on line 5 5 of Fig. 4;

Fig. 6 is an enlarged central longitudinally extending vertical sectional view taken substantially on line 6 6 of Fig. 1 and illustrating the drilling tool structure;

Fig. '7 is a detail sectional view taken substantially on line 'I 'I of Fig. 3;

Fig. 8 is a detail sectional view taken substantially on line 8 8 of Fig. 3; and

Fig. 9 is a diagrammatic plan view of the apparatus shown in Fig. l showing the drilling tools in dierent positions. Y

In this illustrative embodiment of the invention the improved drilling apparatus, generally designated I, is shown associated with a coal mining apparatus generally designated 2. The coal mining apparatus is herein of the Wheel supported, track guided type of the same general construction as that disclosed in my patent, Patent No. 1,785,961, patented Dec. 23, 1930, and 10A generally comprises a portable body 3 adjustably mounted 'on support Wheels 4 adapted to run along a mine trackway 5. Mounted on the body 3 for rotation about a longitudinal axis is a support E carrying a cutter head I in turn having 15V pivotally mounted thereon a usual cutter element carrying cutter bar 8. Arranged within the cutter head support 6 is a motor 9 having its power shaft I0 operatively connected to the mechanisms for actuating the cutting elements on the cutter 2O bar Il, for rotating the cutter head 1, for adjusting the support carrying body 3 and fordriving the support wheels 4 to propel the apparatus as clearly described in the above mentioned patent.

As the specific structure of the mining apparatus 25 is fully disclosed in Patent No. 1,785,961 above mentioned, and as the improved drilling apparatus may be mounted on mining apparatus of various other types, a further description of the same is herein deemed unnecessary other than 30 to state that the kerf cutter is adjustable to cut horizontal kerfs adjacent the mine floor, horizontal kerfs a substantial distance above the mine iloori and vertical kerfs between the mine roof and mine iloor.

The drilling apparatus I generally comprises supporting means generally designated I I extending transversely of and mounted centrally on the top and adjacent the rear end of the body 3 of the mining apparatus as shown in Figs. l and 2 40 this instance, the drill supporting structures, 50

their adjusting means, the drilling tools and their driving means are identical in construction and therefore a description of each'of the same sepa- `rately is not considered necessary. In this in- Y, stance, the supporting means II herein com- 55v prises a central housing I4 attached to the top of the body 3 and having mounted thereon and projecting laterally therefrom at the opposite sides thereof and extending transversely over the top of the body 3 tubular supporting members I5, I5. Journaled within bearing brackets i5, i5 at the opposite sides of the body 3 are swivel frames I'I, Il having tubular bearing portions I8 rotatable within the bearing brackets I6 and within which the outer extremities of the tubular members i5, I5 are supported as shown in Fig. 4, the inner ends or" these tubular members I5, I5 being supported within sleeves I9 in turn supported within the housing ill. Swiveled on the frames il about axes perpendicular to the axes of the swivel frames il are swingable frames 23, 2B, each rotatably supporting a tubular armlike support or boom 2l arranged along the side of the mining apparatus. Attached to the outer extremity of each of the booms 2l is a swivel bracket 22 on which the drilling tool i3 is swiveled about an axis perpendicular to the boom axis.

Now referring to the driving connections between the motor 9 of the mining apparatus and each drilling tool I3, it will be noted that fixed to the motor shaft l is a spur pinion 25 meshing with a spur gear 25 fixed to a longitudinal shaft 2 arranged parallel with and above the motor shaft as shown in Fig. 4. Rotatable with and driven by the shaft 2 is a bevel gear 28 meshing with a bevel gear 29 fixed to the lower end of a vertical shaft 30 suitably journaled within the housing I3. Also fixed to the shaft 33 and driven by the latter is a bevel gear 3l meshing with bevel gears 32, 32 fixed to the inner ends of

alined shafts

33, 33 arranged` with their axes coincident with the axes of the swivel frame Il. These shafts are journaled at their inner ends within the housing I3 and at their outer ends within the swivel frames Il in the manner shown. Journaled on the outer extremity of the shaft 33 is a bevel gear 34 connectible to the shaft in driving relation therewith by a sliding clutch 35. The clutch 35 has teeth engageable with the teeth of a clutch member 33 keyed to the shaft 33 and connectible to the teeth 3l formed on the hub of the bevel gear Sli. The: operating means for the clutch 35 comprises, as shown in Fig. 5, a shipper yoke 38 pivotally mounted on a shaft 39 carried by the swivel frame Il and having a suitable operating handle lill. The gear 3B meshes with a bevel gear 4I rotatably supported on a vertical shaft :l2 arranged with its axis coincident with the axis of the swingable frame 20 and forming the pivotal mounting for the latter. The shaft l2 is attached at its ends to the frame 23 and is rotatably mounted within a bearing sleeve 43 carried by the frame I'I. Meshing with the gear il is a bevel gear 44 Xed to the rear end of a transmission shaft 135,. herein extending centrally through the tubular supporting arm of boom 2i as shown in Fig. 3. This shaft is journaled at its rear end within the swingable frame 23 and at its forward end within the swivel bracket 22, and has fixed thereto at its forward end a bevel gear 4S meshing, as shown in Fig. 3, with a large bevel ring gear il?. This bevel ring gear is rotatable about the swivel axis of the drilling tool I3 and is, as shown, journaled on a Ybearing bracket 38 and a cooperating swivel plate d3. This swivel plate is rigidly secured to the bearing bracket, while the latter is rigidly attached to the housing 59 of the drilling tool. The bevel gear il meshes with a bevel gear 5I iixed to a shaft 52 suitably journaled within the bearing bracket 48. Fixed to the shaft 52 and driven thereby are spur gears 53 and 54 (see Fig. 6), which mesh respectively with spur gears 55 and 56 which constitute driving elements for the tool rotating and feeding mechanisms respec- 5 tively. These driving elements are adapted to effect rotation and feeding of a drilling implement 5l under the control of multiple disc clutches and 59 and a diiferential screw mechanism 63. As the specic drilling structure is 10 clearly described in my co-pending application, Serial No. 255,754, led Feb. 20, 1928, now matured into Patent No. 1,933,589, granted Nov. '7, 1933, further description thereof is herein considered to be unnecessary other than to state 15 that the drilling implement 5l may be fed forwardly at a relatively slow drilling speed or fed in either direction at a relatively high positioning speed while the same is constantly rapidly rotated. It will thus be seen that, due to the` 20 arrangement of various driving shafts and bevel gearings, it is possible to drive the drilling tools I3 irrespective of their adjusted positions relative to the mining apparatus. Each of the drilling tools I3 may be locked against swinging move- 25 ment relative to the bearing bracket 22 by means of a clamp or set screw 6I engageable with a peripheral groove 62 formed on the swivel plate 49 as shown in Fig. 6.

The mechanisms for swinging the supporting 30 structures l2, l2 about the axes of the swivel frames Il each comprises a lever or arm (see Figs. 3 and 7) 65 secured as by keys 66 and a clamp 6l to the adjacent tubular member i5, the lever G5 being secured to the member i5 between 35 the bearing bracket E3 and the swivel frame 23 as shown in Fig. 4. The outer end of the lever 65 is herein in the form of a yoke 68 and straddles a guide frame SS suitably attached to the adjacent side of the body 3 of the mining apparatus 40 and pivotally connected at 'liito a sliding trunnion l! respectively mounted within a vertical guideway 'l2 formed in the bracket 59. The trunnion il is in the form of a nut and threadedly engages at i3 a vertical screw 'M suitably journaled with- 45 in the guide bracket 69. Connected to the upper end of the screw 'M is a reversible ratchet wrench 'I5 of a usual design by means of which the screw may be manually rotated. It will thus be seen that when the screw lf3 is rotated, the nut il 50 slides either upwardly or downwardly within the guideway l2, thereby swinging the lever 35 about its pivot and as a result, the supporting structure for the drilling tool is swung either upwardly or downwardly about the axis of the 55 swivel frame II as desired. The supporting structure for the drilling tool may be swung laterally about the pivot of the swivel frame 23 by simply releasing a clamping nut 'i5 (see Fig. 4) threadedly connected to the lower end of the 60 pivot shaft d2, the nut 'i3 when tightened, clamping the parts of the swivel frames il', 25 together, thereby frictionally to lock the supporting structure against lateral swinging movement.

The mechanisms for rolling the supporting 65 structures for the drilling tools about the axes of the supporting arms or booms 2l herein comprises, as shown in Figs. 3 and 8, a worm wheel 33 keyed to the boom 2 I, intermediate sleeve bearings 8I, 8I carried by the frame 23 and within 70 which the boom is rotatably mounted. Meshing with the worm wheel 83 is a worm 82 fixed to a transverse shaft 83 suitably journaled within the frame 23. Attached to one end of the shaft 33 is an operating lever 84 by means of which the 75 worm gearing may be manually rotated. The worm gearing Sii, 82 is self-locking and maintains automatically the supporting structure in its different adjusted positions about the boom axis. The drilling tool may be swung about its swivel mounting on the swivel bracket carried at the outer extremity of the boom simply by releasing the clamping screw 6I and manually turning the drilling tool about its swivel axis.

In the operation of the improved drilling apparatus, the coal mining apparatus is run into the entry and, when the coal face is reached, the cutter bar 8 is swung to a position with its tip end at the right hand side of the entry. The apparatus vis then propelled along the mine trackway to effect sumping of the cutter bar into the coal face and the cutter bar is thereafter swung from one side of the entry to the other to ei-lect its transverse cutting operation, thereby cutting a transverse kerf in the coal face in the manner clearly described in my Patent No. 1,735,961 mentioned above. During the swinging movement of the cutter bar or after the swinging movement is completed and the cutter bar is partially or entirely withdrawn from the cut, the operator adjusts the drilling tools i3 into the desired location relative to the coal face and a plurality of shot or blast holes are drilled in the coal face prior to the completion of the cut within the coal. If it is desired to drill a series of holes adjacent the ribs of the entry, the operator loosens the clamping nuts 'l5 and manually swings the supporting structures i2, E2 laterally from the position shown in Fig. l to the position shown in Fig.

i9, the supporting structures thereafter being clamped in position by tightening the nuts i6. The clamping screws Si are then released and the drills are swung about their swivel mountings at the other extremities of the supporting structures into thel position indicated in dotted lines in Fig. 9. The feed and rotation control clutches 59, of the drilling tool are then suitably operated to effect feed of the drilling implement 5l within the coal. If it is desired to drill a series of blast holes in the coal face adjacent the mine floor when the kerf cutter of the mining apparatus is in its top cutting position a substantial distance above the mine floor, the booms are rolled within the swivel mounting to bring the swivel axes of the drilling tools horizontal and thereafter the ratchet wrenches l5 are operated to swing the supporting structures l2, i2 for the drilling tools i3 downwardly and the drilling tools are then suitably adjusted about their swivel j mountings until they assume the position indicated in dotted lines in Fig. 2. When it is desired to drill a series of blast holes in the coal face adjacent the mine roof when the kerf cutter of the mining apparatus is in top cutting position, the booms are swung upwardly to position the drilling tools adjacent the mine roof and the drills are then operated in the manner above described. It is accordingly evident that the drilling tools may be adjusted laterally in any desired position at the opposite sides of the mining apparatus or may be adjusted vertically into any desired position between the mine roof and the mine iioor. When it is desired to swing the drilling tools about the axes of the booms 2i, this may be accomplished simply by turning the handle 8d to actuate the worm gearing Sil, 82 of the boom rotating mechanism, it being possible to adjust the drilling tools through a complete circle about the axes of the booms. After the drilling operation is completed, the supporting structures for the drilling tools are returned into transport position as shown in Fig. 1 adjacent the sides of the mining apparatus, and the cutting mechanism of the mining apparatus is again operated and the apparatus moves rearward- 5 ly to retract the cutter bar from the coal face in a well known manner. The drilling tools of the mining apparatus operate in this same general manner during the insertion of a shear or vertical cut'in the coal face, it being possible to adjust the 10 cutter bar into a shearing position simply by rotating the cutter head l about its axis. in the manner clearly described in the patent above referred to. Various other adjustments and uses of the improved drilling apparatus will be clear- 15v ly apparent to those skilled in the art.

While there is. in this application specifically described one form which this invention may assume in practice, it will be understood that this. form of the same is shown for purposes of illus- 20 tration 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 tosecure by Letters Patent is:

l. In combination, a mining machine adapted to effect its cutting function while supported and guided b-y a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position adjacent the mine licor and into a top cutting position a substantial distance abo-Ve the mine iioor, drill supporting boom structures swivelly mounted about rectangularly related axes at the opposite sides of the mining machine and swingable laterally outwardly from the sides of the mining machine and vertically downwardly along the sides of the mining machine, and drilling tools mounted on the outer extremities of said boom structures, said boom structures being adjustable to position the drilling tools to drill holes adjacent the mine iioor when the kerf cutting mechanism is in its top cutting position and to drill holes adjacent the mine roof when the kerf cutting mechanism is in its bottom cutting position.

2. In co-mbination, a mining machine adapted to eiect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position adjacent the mine iioor and a top cutting position a substantial distance above the mine oor, a drill supporting structure mounted at the side of the mining machine and adjustable about a horizontal axis vertically downwardly along the side of the mining machine in planes parallel to the latter and laterally relative to the mining machine about an upright axis at the side of the mining machine, and a drilling tool mounted on the outer extremity of said suppcrting structure, said supporting structure being adjustable to position the drilling tool to drill holes near the mine oor when the kerf cutting mechanism is in its top cutting position and to drill holes adjacent the mine roof when the kerf cutting mechanism is in its bottom cutting position.

3. In combination, a mining machine adapted to eiiect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position adjacent the mine floor and a top cutting position a substantial distance abo-ve the mine floor; a motor carried by the mining machine for actuating said kerf cutting mechanism in any of its adjusted positions, a drill supporting structure mounted at the side of the mining machine for adjustment about a horizontal pivot vertically downwardly along the side of 'the mining machine in planes parallel to the latter and laterally relative to the mining machine and said motor about an upright axis at the side of the machine, a drilling tool mounted on the outer extremity of said supporting structure, said supporting structure being adjustable to position the drilling tool to drill holes adjacent the mine floor when the kerf cutting mechanism is in its top cutting position and to drill holes adjacent the mine roo-f when the kerf cutting mechanism is in its bottom cutting position, and driving connections between said motor and said drilling tool operative irrespective of the adjusted position of said supporting structure relative to the mining machine.

4. In combination, a mining machine adapted to effect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a top cutting position a substantial distance above the mine oor, a motor carried by the mining machine for actuating said kerf cutting mechanism, a drill supporting structure mounted at the side of the mining machine for adjustment about a horizontal axis vertically downwardly along the side of the mining machine in planes parallel to the latter and laterally relative to the mining machine about an upright axis at the side o-f the mining machine, a drilling tool swivelly mounted .on the outer extremity of said supporting structure, said supporting structure being adjusted as aforesaid to position the drilling tool to drill holes adjacent the mine iioor when the kerf cutting mechanism is in aforesaid top cutting position, and driving connections between said motor and said drilling tool operative irrespective of the adjusted position of said supporting structure relative to the mining machine and the swiveled position of said drilling tool relative to said supporting structure.

5. In combination, a mining machine adapted to effect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a top cutting position to cut a nerf a substantial distance above the mine floor, a motor carried by the mining machine for actuating said kerf cutting mechanism, drill supporting structures mounted at the opposite sides of the mining machine for adjustment downwardly along the sides of the mining machine relative to the mining machine and said motor, drilling tools mounted on the outer extremities of said supporting structures, said supporting structures being adjustable to position said drilling tools to drill holes adjacent the mine iloor when said kerf cutting mechanism is in its top cutting position, and driving connections between said motor and said drilling tool operative irrespective of the adjusted position of said supporting structures relative to the mining .said motor, drilling tools swivelly mounted on the outer extremities of said supporting structures, and driving connections between said motor and said drilling tools operative irrespective of the adjusted position of said supporting structures relative to said mining machine and the swivelled position of the drilling tools relative to said supporting structures.

7. In combination, a mining machine adapted to effect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position to cut a kerf near the mine oor and into a top cutting position to cut a kerf a substantial distance above the mine floor, a pair of independently adjustable elongated supporting structures mounted at their rear ends on the opposite sides of the mining machine and extending forwardly along the sides of the mining machine, a drilling tool supported at the outer extremity of each supporting structure, said supporting structures being adjustable along the sides of the mining machine to move said tools into different relatively high parallel drilling positions to drill holes near the mine roof when said kerf cutting mechanism is in its bottom cutting position, into diiferent relatively low parallel drilling positions to drill holes near the mine floor when said kerf cutting mechanism is in its top cutting position and into different lateral drilling positions relative to the mining machine in either of aforesaid cutting positions to enable said tools to drill holes above, below and at either side of the mining machine.

8. In combination, a mining machine adapted to eiiect its cutting function while supported and guided by a mine traclway and having kerf cutting mechanism adjustable into a bottom cutting position to cut a kerf near the mine floor and into a top cutting position to cut a kerf a substantial distance above the mine floor, a pair of independently adjustable elongated supporting structures mounted at their rear ends on the opposite sides of the mining machine and extending lforwardly along the sides of the mining machine, a drilling tool supported at the outer extremity of each supporting structure, said supporting structures being adjustable along the sides of the mining machine to move said tools into different relatively high parallel drilling positions to drill holes near the mine roof when said kerf cutting mechanism is in its bottom cutting position, into different relatively low parallel drilling positions to drill holes near the mine floor when said kerf cutting mechanism is in its top cutting position and into different lateral drilling positions relative to the mining machine when said kerf cutting mechanism is in either of aforesaid cutting positions to enable said tools to drill holes above, below and at either side of the mining machine, a motor on the mining machine, and driving connections between said motor and both of said drilling tools.

9. In combination, a mining machine adapted to effect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position to cut a kerf near the mine iioor and into a top cutting position to cut .a kerf a substantial distance above the mine oor, a pair of independently adjustable elongated supporting structures mounted at their rear ends on the opposite sides of the mining machine and extending forwardly along the sides of the mining machine, a drilling tool supported at the outer extremity of each supporting structure, said supporting structures being adjustable along the sides of the mining machine to movesaid tools into different relatively high parallel drilling positions to drill holes near the mine roof when said kerf cutting mechanism is in its bottom cutting position, into different relatively low parallel drilling positions t drill holes near the mine floor when said kerf cutting mechanism is in its top cutting position and into different lateral drilling positions relative to the mining machine when said kerf cutting mechanism is in either of aforesaid cutting positions to enable said tools to drill holes above, below and at either side of the mining machine, a motor on the mining machine, driving connections between said motor and both of said drilling tools, and mechanism driven by said motor for propelling the mining machine.

10. In combination, a mining machine adapted to effect its cutting function While supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position to cut a kerf near the mine floor and into a top cutting position to cut a kerf a substantial distance above the mine floor, a pair of independently adjustable elongated supporting structures mounted at their rear ends on the opposite sides of the mining machine for swinging movement along the sides of the mining machine about horizontal transversely extending alined axes and extending forwardly along the sides of the mining machine, a drilling tool supported on the outer extremity of each supporting structure, said supporting structures being adjustable to move said tools into different relatively high parallel drilling positions near the mine roof when said kerf cutting mechanism is in its bottom cutting position, into different relatively low parallel drilling positions near the mine oor when said kerf cutting mechanism is in its top cutting position and into different lateral drilling positions relative to the mining machine in either position of the kerf cutting mechanism to enable said tools to drill holes above, below and at either side of the mining machine, and motor operated devices for driving said tools.

11. In combination, a mining machine adapted to effect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position to cut a kerf near the mine floor and into a top cutting position to cut a kerf a substantial distance above the mine floor, a pair of independently adjustable elongated supporting structures mounted at their rear ends on the opposite sides of the mining machine to swing about angularly related axes for swinging movement along the sides of the mining machine about horizontal transversely extending alined axes and extending forwardly along the sides of the mining machine, a drilling too-l supported on the outer extremity of each supporting structure, said supporting structures being adjustable to move said tools into different relatively high parallel drilling positions near the mine roof when said kerf cutting mechanism is in its bottom cutting position, into different relatively low parallel drilling positions near the mine floor when said kerf cutting mechanism is in its top cutting position and into different lateral drilling positions relative to the mining machine in either position of the kerf cutting mechanism to enable said tools to drill holes above, below and at either side of the mining machine, and motor operated devices for driving said tools.

12. In combination, a mining machine adapted to effect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a position to cut a vertical kerf between the mine roof and mine oor, a pair of independently adjustable elonv5 gated supporting structures mounted at their rear ends on the opposite sides of said mining machine and extending forwardly along the sides of the mining machine, a drilling tool supported on the outer extremity of each supporting structure, said 1,0 supporting structures being adjustable to move said tool into diiferent lateral positions relative to the mining machine to drill holes at opposite sides of the vertical kerf when said kerf cutting mechl anism is in said vertical cutting position, a motor carried by the mining machine and relative to' which said supporting structures are adjustable, and driving connections between said motor and both o-f said tools.

13. In combination, a mining machine adapted Y to eifect its cutting function while supported and. guided by a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position to cut a kerf near the mine floor, into a top cutting position to cut a kerf a substantial distance above the mine floor and into a position to cut a vertical kerf between the mine roof and mine floor, a pair of independently adjustable elongated supporting structures mounted at their rear ends on the opposite sides of the mining machine and extending forwardly along the sides of the mining machine, a drilling tool mounted on the outer extremity of each supporting structure, said supporting structures being adjustable to position said tools into different elevated positions along the sides of the mining machine to drill holes near the mine floor when said kerf cutting mechanism is in its top cutting position, to drill holes near the mine roof when said kerf cutting mechanism is in its bottom cutting position 40 and into different lateral positions relative to the mining machine to enable the tools to drill holes at opposite sides of said vertical kerf when said kerf cutting mechanism is in vertical cutting position thereby to enable said tools to drill holes above, below and at either side of the mining ma,-

chine, a motor carried by the mining machine and relative to which said supporting structures are adjustable, and driving connections between said motor and both of said tools. 14. In combination, a mining machine adapted to effect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a vertical cutting position to cut a vertical kerf between the mine roof and mine floor, a pair of independently adjustable elongated supporting structures mounted on the opposite sides of the mining machine and extending forwardly along the sides of the mining machine, and a drilling tool supported on the outer extremity of each supporting structure, said supporting structure being adjustable to move said tools into different lateral and vertical positions relative to the mining machine to drill horizontal holes in the coal face at opposite sides of said vertical kerf when said kerf cutting mechanism is in said vertical cutting position, said supporting structures being adjustable to position said tools to drill horizontal holes in the coal face near the mine floor and near the mine roof. 15. In combination, a mining machine adapted to effect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position to cut a kerf near the mine floor and into a top cutting position to cut a kerf a substantial distance above the mine oor, a pair of independently adjustable elongated supporting structures mounted on the opposite sides of the mining machine and extending forwardly along the sides of the mining machine, and a drilling tool mounted on the outer eX- tremity of each supporting structure, said supporting structures being adjustable to position said tools into different elevated positions along the sides of the mining machine to drill holes near the mine floor when said kerf cutting mechanism is in aforesaid top cutting position and to drill holes near the mine roof when said kerf cutting mechanism is in aforesaid bottom cutting position.

16. In combination, a mining machine adapted to eiect its cutting function While supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position to out a kerf near the mine floor, into a top cutting position to cut a kerf a substantial distance above the mine floor and into a vertical cutting position to cut a Vertical kerf between the mine roof and mine floor, a pair of independently adjustable elongated supporting structures mounted on the opposite sides of 1 the mining machine and extending forwardly along the sides of the mining machine, and a drilling tool mounted on the outer extremity of each supporting structure, said supporting structures being adjustable to position said tools into different elevated positions along the sides of the mining machine and into diierent lateral positions relative to the mining machine to enable said tools to drill holes near the mine floor When said kerf cutting mechanism is in aforesaid top cutting position, to drill holes near the mine roof When said kerf cutting mechanism is in aforesaid bottom cutting position and to drill. holes at either Side of said vertical kerf when said kerf cutting mechanism is in aforesaid Verti- 20 cal cutting position.

MORRIS P. HOLMES.