US2302073A - Mining machine - Google Patents

Description

Nov. 17, 1942. J. E. TRACY MINING MACHINE Filed June 28, 1939 3 Sheets-Sheet l Nov. 17, 1942.- .1. E. TRACY MINING MACHINE Filed June 28. 1959 3 Sheets-Sheet 3 Patented Nov. 17, 1942 UNITED STATES PATENT OFFICE MINING MACHINE James E. Tracy, Pomeroy, Ohio Application June 28, 1939, Serial No. 281,691

lii Claims.

This invention relates to method and means for mining, and more particularly to machines for undercutting the breast of a vein or strata of earth, coal or other minable material, so that the material may be conveniently "shot down into the miners room or mining space.

Heretofore mining of this character has been conducted with the aid of relatively large, cumbersome, heavy and expensive machines which required large output of power, and entailed great expense in their handling, operating and maintenance. A popular mining machine now employed incorporates endless conveyors o chains which carry cutting tools or bits arranged to undercut the breast of coal or other minable material, and in undercutting a breast of coal these machines produce an excessive quantity of relatively small coal particles or bug dust, and the cutting components are frequently damaged by their engagement with streaks of hard sulphur or other hard material present in the coal vein.

An object of this invention is to provide an improved method and mechanism for mining coal or other commercially valuable material.

Another object of this invention is to provide a relatively small and compact mining or coal cutting machine which may be operated to commercial advantage in both large and small mines, and under conditions where relatively shallow veins of coal are encountered and also under conditions in which very low head room is available.

A specific object of this invention is to provide a mining machine in which a single auger, drill or cutting arm is fed while being driven for drilling or cutting operation axially into the breast of the material being mined, and then moved laterally while under cutting operation to produce an undercut or kerf along the breast of the vein of minable material.

Another object of this invention is to provide a mining machine incorporating novel instrumentalities for undercutting Or producing a kerf or recess in the breast or vein of minable material, and for drilling shot apertures or recess above the said undercutting so that the vein of minable material may be readily shot down into the clearing or miners room.

A more specific object of this invention is to provide a mining machine in which a single auger, drill or cutting arm is fed into the breast or vein of minable material while the said auger is being driven to impart thereto both rotary and reciprocatory motion, and then moving the machine laterally so that the driven auger produces an undercut kerf or horizontally-disposed recess in the breast of the minable material.

A further object of this invention is to pro-' vide a mining machine in which a tapered auger, drill or cutting tool is ied axially while being driven for both rotary and reciprocatory operation, so that a tapered frusto-conical recess is initially out for a predetermined distance into the breast of the material being mined and then moving the tapered auger laterally so that an outwardly tapering kerf or recess is cut across the breast of the material being mined.

It is also an object of this invention to Provide a mining machine of generally improved construction, whereby the device Will be simple, durable and inexpensive in construction, as Well as convenient, practical, serviceable and efiicient in its use.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that various changes in form,

proportion, and minor details of construction may be made within the scope of the claims without departing from the spirit or sacrificing any advantages of the invention. 7 v

For a complete disclosure of the invention, a detailed description of the improved mining method and mechanism will now be given in connection with the accompanying drawings forming a part of the specification, wherein:

Figure 1 is a side elevation of the improved mining machine depicting it in operative position in a coal mine, a portion of the mine being shown in vertical section,

Figure 2 is a longitudinal vertical section taken through the improved mining machine,

Figure 3 is a plan view, parts appearing in section,

Figure 4 is an end view of the mining machine,

Figure 5 is a vertical detail sectional view,

Figure 6 is a vertical sectional view taken on the line 6-6 of Figure 1, and

Figure 7 is a side elevation of a preferred form of cutting arm or auger to be used in connection with the improved mining machine.

Referring to the drawings, in which similar reference characters designate corresponding parts, there is depicted the improved mining machine which includes a base ll] of the sup-v porting frame of the machine, the base having a bearing pedestal ll secured to the upper face of one terminal thereof by bolts or other suitable securing devices [2. Bearing pedestals l3 and [5 are secured to the upper face of the base Ill by bolts, screws or other suitable securing devices l6, and at the upper terminal of the bearing pedestal I3 a bearing aperture I7 is formed in axial alinement with a similar bearing aperture it formed in the upper terminal of the bearing pedestal H. A shaft is rotatably secured within the bearing apertures l! and E3, and this shaft is secured to and rotatably supports an elongated pinion 28, which meshes with a pinion 22, carried and driven by a motor 23, which is supported on a frame member or plate 25, which, in turn, is supported by the bearing pedestals l3 and I5.

Bearing apertures 26 and 2'! are formed in the bearing pedestals l3 and i5 for the sliding reception of bearing sleeves or members 28 and 30. The axial dimension of the bearing sleeve 28 is greater than the axial dimension of the bearing aperture 23, and a suitable bearing 3| is secured against axial motion within the sleeve 28. A similar bearing 32 is secured against relative axial motion within the sleeve 30, and the bearings 31 and 32 may be of any preferred construction, such as sleeve bearings, or they may be any commercially acceptable antifriction bearings of the ball or the roller type. A shaft 33 is rotatably mounted in the bearings 3! and 32, and a gear 35 is secured to one terminal of this drill shaft 33,- the gear 35 being constantly in mesh with the elongated pinion 2!. The shaft 33 is held, at one terminal, against axial movement relative to the bearing member 3! by the inner face of the gear 35 and any suitable collar or sleeve indicated at 36, and this shaft is held at its opposed terminal against axial movement relative to the bearing 32 by the inner face 31 of an enlarged flange or disc 38 and a suitable collar or sleeve 3!]. Thus it is seen that the shaft 33 is rotatably supported in the bearings MI and 32, but it is held against axial movement relative thereto, and the bearings 3| and 32 are held against axial movement within the axially movable bearing sleeves 28 and 33. The sleeves 28 and 33, in turn, are mounted for axial movement within the bearing apertures and 21 of the bearing pedestals l3 and I5.

Theinner terminal of the bearing sleeve is provided with a gear housing or casing 42 having a worm 43 positioned therein, the worm being secured to and rotatable with the shaft 33. The worm 43 meshes with a worm gear 65 rigidly secured to and carried by a shaft 45 which is rotatably mounted in bearing apertures 4'! and 48 formed in the gear housing 42. One tern'r nal of the shaft 45 has a crank disk 50 keyed or otherwise rigidly secured thereto, the crank being positioned externally of the gear housing 42. A link or pitman 51 is pivotally secured to the crank disk 50 by a bolt or wrist pin 53, and the opposed terminal of the link or pitman 5! is pivotally secured to a slidable plate or member 54 by a suitable bolt or pin 55. The plate 54 is slidably mounted in a longitudinally extending aperture 56 formed in the bearing pedestal-'13. The terminal of the slidable plate or member 54 which is remote from its pivotal connection with the pitman 5| is provided with alined apertures 51 which receive a pin or bolt 58 that extends through an ear 60 formed at the outer terminal of a latch or stop member 6|, so that this latch or stop member 6| is pivotally secured to the outer terminal of the slidable plate or member 54. A manipulating handle or knob 62 is secured to the upper face of the stop member or latch 32 to provide convenient means for manually moving the latch or stop member 6! about its pivot or fulcrum pin 53. When the latch 6! is in normal position resting upon the up er face of the slidable plate 54 its outer terminal 33 engages a face of the bearing pedestal E3 to thereby lock the slidable plate against longitudinal movement, which action will be hereinafter more fully disclosed.

A block or supporting member 35 is slidably received within an elongated slot 3t formed in the link or pitman 5|, and ears 3? extend laterally across the link or pitman 5i from each terminal of the block 35, which ears are disposed in opposition and may be bolted or otherwise suitably secured to the block 35. A bolt 53 extends through suitable apertures formed in the outer terminal of the ears 3i" so that the ears may be clamped to the opposed faces of the link or pitman 5i to thereby lock or secure the block in any desired position in the elongated slot 63, to provide an adjustment which will be more fully disclosed hereinafter. Opposed links i3 and H are pivotaily secured to the block as indicated at l2, and the terminals of the links 73 and H which are remote from their pivotal connection '52 with the block 65 are pivotally secured to arms 73 and '55, as indicated at '26 and H. The arm 13 has a pawl 73 pivotally secured thereto, as indicated at 33, and the arm i5 has a similar pawl pivotally secured thereto, as i dicated at 32, and the pawis 86 and 8! are normally constrain d towards and engage the teeth 83 of a ratchet 35 secured to a shaft 33 rotatably supported by the base E3 of the machine frame. A drum or spool 8? is secured to and rotates with the shaft 83, and it has a suitable length of cable or other flexible element wound about the peripheral portion thereof. The cable 88 leads outwardly from the spool or drum 81 around a sheave or guide pulley 33 and it has its outer terminal, not shown, suitably secured to fixed object within the mine, for reasons to be hereinafter disclosed. A spool or drum 9| is rotatably secured to the machine base it, as indicated at 32, and this drum is preferably held against rotation in one direction by a ratchet 33 which is normally engaged by a pawl 33. A cable or other flexible element 35 is carried by the drum and leads therefrom to any suitable destination within the mine, as will be hereinafter more fully explained.

The enlarged flange or disc 33 carried by the drill shaft 33 is designed to actuate a mining drill or auger of any suitable construction, and in the present instance, as best depicted in Figure 7, there is provided a cutting arm, drill or auger 53, preferably formed by spirally disposing ribs or flanges 9? about a central or axial stiffening rod or shaft 33. At one terminal of the cutting arm or auger 96 the ribs 3i and stiffening shaft 98 lead to a head or flange iEiiI havin an upstanding boss or lug 43! extending transversely or diametrically thereacross. The boss lei is adapted to be received in a complementary recess 39 formed in the shaft head or flange 33, the recess 39 extending diametrically across the outer face of the flange Securing apertures I32 extend around the peripheral portion of the securing flange I63 for the reception of bolts or other securing devices 83 which extend through the flanges 33 and N23 to thereby rigidly secure the auger or drill flange I to the shaft flange or head 38, with the diametrically extending boss IOI of the flange 38 accurately engaging the diametrically extending recess 39 formed in the shaft head 38. By this arrangement the securing bolts I03 are relieved of all tortional stress because of the accurate engagement of the diametrically extending boss IOI with the diametrically extending recess 39.

The drill or auger 98 may be of any suitable length, and usually a length from 4 to 6 feet is commercially acceptable. The inner terminal of the auger is of greater diameter than its outer terminal, the inner terminal preferably being about 6", and the auger tapers outwardly from this point to its outer terminal which preferably has a diametrical dimension of about 2. At re ularly spaced intervals along the helically disposed ribs 91 there are provided apertures IDES for the reception of suitable cutting bits or tools I06 which are secured within the apertures by screws or other suitable securing devices !01 As will be hereinafter explained, the drill shaft 33 both rotates and reciprocates, and its reciprocatory movement is preferably about 6". The reoiprocatory movement of the shaft 33, of course, imparts a reciprocatory motion to the drill or auger 95 of like amplitude, and the cutting tools or bits are preferably spaced apart a distance somewhat less than the amplitude of axial movement of the drill or auger, which feature will be more fully explained hereinafter. The outer terminal of the helically disposed ribs 91 preferably terminate in laterally flaring cutting members or teeth I08 to affect the initial cutting during the drilling operation.

The shot or explosive charge is usually positioned above the undercut recess in order that the coal may be shot down into the miners room, therefore to provide convenient and exped tious means for drilling the shot hole or aperture, a power drill is operated from the drilling machine. This drill includes an upright frame or housing II 8, which may be bolted or otherwise secured to the machine frame, as indicated at Ill. A cross head or block H2 is mounted for vertical sliding movement in the drill housing or frame I I0, and opposed bearing members or rings H3 are carried by the block I I2 and extend inwardly towards each other. The outer cylindrical faces H of the bearing rings II3 rotatably support bearing flanges IIB of a sprocket H1, and the bearing rings II3 are also provided with inner spherical bearing surfaces I I8, which support a spherical drill socket I 20 for universal movement.

Gear teeth I2! are formed around the peripheral portion of the drill socket I29 and mesh with gear teeth I22 formed Within the sprocket i H. A drill or auger shaft I23 is mounted for sliding move ment within the drill socket I30, and this shaft I23 is held against rotary motion relative to the socket I23 by a key or other suitable securing device I25. The inner terminal ofthe drill or auger shaft I '23 is threaded, as indicated at 525, which threads engage similar threads 12? formed internally of a manipulating nut or wheel I28. An annular groove I30 is formed in the hub of the manipulating wheel 528 for the reception of an annular flange I3I extending inwardly from a split annulus or ring I32. A cross or rail I33 extends horizontally across the p tion of the drill or auger frame l ill, and .llS or rail is internally threaded as indicated at I35 to threadedly engage a threaded stem @333 which is secured to and extends upwardly from the cross head or block I I2. A threaded manipulating nut or wheel I 31 threadedly engages the stem I36, and this hand wheel or nut I31 is held against axial movementby a split ring or annulus I38 whichengages an annular groove Ida formed in the peripheral portion of the nut I31. The outer terminal of the drill shaft I23 is provided with any suitable drill or auger I2 1 having a diametrical dimension suitable for drilling the usual shot hole or opening, indicated at H in Figure 1 In order to drive the drill shaft I23, a chain or other flexible driving element I42 is trained around the sprocket .II1. From this point the chain leads downwardly around a spring stressed idler sprocket I43, and then around a drive sprocket I45. The drive sprocket I45 is carried by a stub shaft I mounted in suitable bearings in the machine frame, and a clutch M1 is slidably mounted on the shaft Hi5 but is keyed against rotation relative thereto. The clutch member I41 may be moved to and from engagement with a similar clutch member I48, driven by the motor 23, by a manipulating handle or lever I50.

In operation, the machine frame is movedin predetermined position in front of the breastof coal or material to be mined and the motor is put in operation to drive the operating components of the machine. This causes the shaft I33 to rotate, and its rotation, in turn, imparts rotary motion to the crank 50 through the interposed worm 43 and worm gear 45. Assuming the latch member or stop 6| is in lowered position, as indicated in Figure 2, the rotation of the crank 50 moves the entire shaft assembly back and forth, and. the amplitude of this reciprocatory motion is determined by the amplitude of offset of the wrist pin 53. Since the driven shaft I03 both rotates and reciprocates, this rotary and reciprocatory motion is imparted to the drill or auger 96, thus causing the auger 96 to cut a tapered aperture into the breast of coal or material being mined, as best indicated in Figure 1. As the crank 50 rotates, rocking motion is imparted to the pitman or link 5I, which, in turn, imparts oscillatory motion of the arms 13 and 15 which causes the pawls 18 and 8| to engage the, teeth 83 of the ratchet 85 to thereby rotate the cable drum 81. As the cable drum 81 rotates, it draws in the cable 88 and thus feeds the machine in any desired direction, dependent on the location of the anchored outer terminal of the cable. While feeding the auger or drill axially into the coal breast the cable extends forwardly, as indicated at 88a in Figure 3, and its outer terminal is secured to any suitable stationary object in the mine so that the drill is fed axially into the coal breast. After the drill or auger 93 has drilled into the coal breast the desired distance, usually from 4 to 6 feet, then the cable 88 is led outwardly around the pulley or sheave 90, as indicated at 88b in Figure 3. The forward movement of the drill or auger 96 is thus discontinued but the drill continues to rotate and. reciprocate, and, at the same time, the entire machine is fed transversely across the breast, to thus cut a tapered horizontally disposed slot or recess S the desired disstance across the coal breast, as best seen in Figure 1. If it is desired to operate the cable drum 81 without reciprocating the drill or auger shaft 33, the latch or block BI is swung rearwardly away from the bearing pedestal I3, so that the shaft 33 and its housing remain stationary, but the plate 54 reciprocates. The resultant motion imparted to the pitman 5I by the liberation of the plate 54 continues to operate the drum 8'! through the hereinbefore described instrumentalities. If it is desired to vary the amplitude of rocking movement imparted to the arms I31 and I5, this may be accomplished by releasing the screw or bolt 68 so that the block 65 may be slid longitudinally within the recess 66. By this arrangement the speed of operation of the cable drum 8'! may be varied simply by adjustably sliding the block 65 in the slot 66 of the pitman or link 5|. The horizontally-extending tapered slot S is disposed so that its outer terminal has a greater vertical dimension than its inner terminal, the vertical dimension of the outer terminal being preferably about 6" and the vertical dimension of its inner terminal being preferably about 2". After the tapered recess has been cut across the coal breast, the clutch lever I50 is manipulated to cause the clutch member I4! to engage the clutch member I48, thus imparting rotary motion to the sprocket I45. The sprocket I45, in turn, imparts rotary motion to the sprocket II'I through the interposed chain I42, thereby imparting rotary motion to the drill or auger shaft I23 and auger I24. The auger I24 is then fed axially forwardly to cause it to drill the shot hole or aperture H the required depth into the coal breast. The shot hole or aperture H is preferably positioned above the undercut tapered slot or recess S, and, since the drill or auger shaft I23 is mounted for universal movement, this shot hole or aperture may be formed at any desired angle, as indicated in dotted lines in Figure 1.

By rotating the hand wheel or nut I28, the shaft I23 may be fed axially inwardly or outwardly, and by tilting the shaft I23 it may be disposed at any desired angle within the range of its movement relative to the face of the breast of coal. Universal movement of the drill or auger shaft I23 is permitted because the spherical drill socket I20 is mounted for universal movement within the bearings I I3. Furthermore, the drill or auger shaft I23 may be vertically adjusted by rotating or manipulating the hand wheel I37. The rotation of the hand wheel I31 causes the cross head II2 to move upwardly and downwardly to thus permit the shot aperture or hole H to be drilled any desired distance above the undercut slot or recess S.

After the undercut recess or slot S has been formed and the shot hole H drilled, then the machine is moved a safe distance away from the coal breast preparatory to firing the shot. When the shot is fired the resultant loose coal will impinge the inclined lower wall of the undercut slot or recess S, thereby causing the coal to fall outwardly into the miners room for quick, convenient and easy access. Thus it is seen that by forming the undercut slot or recess S of tapered. configuration, the coal loosened by the fired shot will fall outwardly into the miners room rather than remaining in the, coal breast.

In moving the machine towards the coal breast or laterally across the coal breast, by the action of the cable drum 8? and cable 83, the machine tends to move around or creep away from the drill owing to the drill resistance. This creeping or turning action of the machine, however, may be arrested by the proper manipulation of the cable 95 through its drum es and ratchet lock. The outer terminal of the cable 95 may be secured to any fixed object in the mine, not shown, to thus anchor this terminal of the machine against movement. The cable drum QI may be either hand driven or power driven, but,

inasmuch as this driving mechanism does not form a specific feature of this invention it has not been disclosed herein.

In phases of the operation of the machine it is desirable to operate the cable drum 87 without imparting reciprocatory motion to the drill or auger shaft 33 and the auger 96. In this event the manipulating knob 62 of the latch EI is grasped and moved rearwardly about its hinge or fulcrum pin 58 away from the bearing pedestal I3. In this position of the components the slidable plate 54 slides back and forth, and, consequently, the drill or auger shaft 33 remains axially stationary, but the rocking motion of the pitman 5! causes the cable drum 8? to rotate through the instrumentalities hereinbefore disclosed, thus permitting the cable 88 to be mployed to move the machine to any desired location within the mine.

By simultaneously rotating and reciprocating the cutting arm or auger 96 the efficiency of the coal cutting or mining machine is greatly enhanced. As hereinbefore stated, the amplitude of reciprocatory motion of the auger 96 is about 6 and the cutting bits or tools are spaced apart a distance preferably 5", or some airmen sion slightly less than 6", so that in each rec'procatory movement of the auger 9%, each tool travels axially a distance to slightly overlap the cutting Zone or area of the next adjacent tool. By this arrangement, a relatively small number of cutting bits may be employed, and, at the same time, a sharp clear cut is effected, thereby saving power and also increasing the speed of operation of the cutting tool or auger.

Having thus described my invention, what I claim as new and useful is:

1. In a mining machine, a frame, a shaft mounted for rotary and axial recipro-catory movement, means for imparting rotary movement to the said shaft, means for imparting reciprocatory motion to the said shaft, an auger secured to the said shaft so that the rotary and reciprccetory movement of the shaft is imparted to the said auger, a rotatable cable drum, a rotatable member rotatably driven by the shaft, means operably connectin the cable drum with the r0- tatable member whereby the rotation of the rotatable member imparts intermittent rotary movement to the drum, anda cable leading from the drum to a member external or the machine.

2. In a mining machine, a frame, a shaft mounted for rotary and axial reciprocatory movement, drive means for imparting tary movement to the said shaft, means for imparting reciprocatory motion to the shaft. auger secured to the said shaft so that the rotary and reciprocatory movement of the sh 1- is imparted to the said auger, a rotateblcable drum, power imparting means opal-ably inter posed between the cable drum and the shaft to thereby impart intermittent rotary movement to the drum by the movement of the shaft. a cable leading from the drum to a fixed member external of the machine whereby the movable cable moves the machine, and means for adjust. the said power imparting means to vary the amplitude of rotary movement imparted to the cable drum from the said shaft,

3. In a mining machine, a frame, a shaft mounted for rotary and axial reciprocatory movement, a gear carried by the shaft and axially movable therewith, an elongated fixed gear meshing with the axially movable gear, power imparting means, a pinion driven by the power imparting means and meshing with the elongated fixed gear to thereby drive th elongated fixed gear and axially movable gear to impart rotary motion to the shaft, a crank rotatable with the shaft, a fixed member, means carried by the shaft for imparting rotary motion to the crank, a pitman operably interposed between the fixed member and the crank to thereby impart axial reciprocatory motion to the shaft when the crank rotates, and an auger secured to the shaft.

4. In a mining machine, a frame, a shaft mounted for rotary and axial reciprocatory movement, a gear carried by the shaft and axially movable therewith, an elongated fixed gear meshing with the axially movable gear, power imparting means, a pinion driven by the power imparting means and meshing with the elongated fixed gear to thereby drive the elongated fixed gear and axially movable gear to impart rotary motion to the shaft, a crank rotatable with the shaft, a slidable member, a latch arranged to lock the slidable member in fixed relation to the machine frame, means carried by the shaft for imparting rotary motion to the crank, and a pitman operably interposed between the slidable member and the crank to thereby impart axial reciprocatory motion to the shaft when the slidable member is locked in fixed relation to the machine frame or to impart reciprocatory motion to the slidable member when the latch is adjusted to permit the slidable member to move relative to the machine frame.

5. In a mining machine, a frame, a shaft mounted for rotary and axial reciprocatory movement, means for imparting rotary movement to the shaft, a rotatable member rotatably driven by and bodily movable with the shaft, a member fixed relative to the frame, means for operably connecting the rotatable member with the fixed member to impart reciprocatory movement to the shaft by the rotation of the rotatable member, and an auger secured to the said shaft so that the rotary and reciprocatory movement of the shaft is imparted to the said auger.

6. In a mining machine, a frame, a shaft mounted for rotary and axial reciprocatory movement, driving means for imparting rotary movement to the said shaft, a rotatable member rotatably driven by and bodily movable with the shaft, a member fixed relative to the frame, means for operably connecting the rotatable member with the fixed member to impart reciprocatory movement to the shaft by the rotation of the rotatable member, an auger secured to the said shaft so that the rotary and reciprocatory movement of the shaft is imparted to the auger, a support, a drill adjustably mounted on the support, and means for operably connecting the drill with the said driving means to drive the drill.

7. In a mining machine, a frame, a shaft mounted for rotary and axial reciprocatory movement, means for imparting rotar movement to the shaft, a rotatable member rotatably driven by and bodily movable with the shaft, a member fixed relative to the frame,

means for operably connecting the rotatable member with the fixed member to impart reciprocatory movement to the shaft by the rotation of the rotatable member, an auger secured to the shaft that the rotary and axial reciprocatory movement of the shaft is imparted to the auger, a support, a drill mounted for adjusting movement on the support, and means for operably connecting the drill with the said driving means to impart rotary movement to the drill.

8. In a mining machine, a frame, an auger mounted for rotary and axial reciprocatory movement relative to th frame, means for imparting rotary movement to the auger, means for imparting reciprocatory motion to the auger, a fixed vertical support carried by the frame, a crosshead supported for vertical sliding movement by the fixed support, a bearing carried by the crosshead, a drill socket supported for adjusting movement in the bearing, a drill slidably supported by the drill socket and rotatable therewith, a sprocket rotatably supported by the bearing and operably connected with the drill socket to impart rotary movement thereto, means for operably connecting the sprocket with the auger driving means to drive the drill socket and drill, and means for vertically adjusting the cross head relative to the fixed support to thereby move the drill to or from the auger.

9. In a mining machine, a frame, an auger mounted for rotary and axial reciprocatory movement relative to the frame, means for imparting rotary movement to the auger, means for imparting reciprocatory motion to the auger, a fixed Vertical support carried by the frame, a crosshead supported for vertical sliding movement by the fixed support, a bearing carried by the crosshead, a drill socket supported for adjusting movement in the bearing, a drill mounted for axial sliding movement within the drill socket, means for securing the drill against rotary movement relative to the drill socket, means supported by the drill socket for adjusting the drill axially relative to the drill socket, a sprocket rotatably supported by the bearing and operably connected with the drill socket to impart rotary movement thereto, means for operably connecting the sprocket with the auger driving means to drive the drill socket and drill, and means for vertically adjusting the crosshead relative to the fixed support to thereby move the drill to or from the auger.

10. Ina mining machine, a frame, a fixed vertical support carried by the frame, a crosshead supported for vertical sliding movement by the fixed support, a bearing carried by the crosshead, a drill socket supported for limited pivotal movement in horizontal and vertical planes in the bearing, a drill slidably supported by the drill socket and rotatable therewith, a driven member operably supported by the frame, means for operably connecting the driven member with the said drill socket to thereby drive the drill, and means for adjusting the crosshead to thereby move the drill relative to the said frame.

JAMES E. TRACY.

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