US2007908A - Mining apparatus - Google Patents

Description

C. F. OSGOOD MINING APPARATUS July 9, 1935.

Filed Sept. l2, 1932 6 Sheets-Sheet l fnUenZ/or: ZeJ'FOaggood.

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July 9,1935. C. F. OSGOOD 2,007,000

MINING APPARATUS Filed Sept. 12, 1952 6 Sheets-Sheet 3 jini/venan July 9, 1935. Q F. OSGOOD 2,007,908

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2,007,908- MINING APPARATUS UNITED-STATES i PATENT OFFICE N Charles F. Osgood, Claremont, H., assignor to Sullivanlvachinery Company, a corporation of Massachusetts"` A Application september 12, 1932, serial No. 632,726

` cs claims. (ci. 26e- 2st l This invention relates to mining apparatus, Fig. 13fisa detail sectionalview taken substanand more particularly to improvements in coal tially on line |3 |3 of Fig. 12. mining apparatus of the combined horizontal Fig-1li isa transverse vertical sectional view and shear cutter, wheel'mounted, track supported taken substantially on line M M of Fig. 1'. l 5 and guided type. .g Y s Fig."15 is a detailview illustrating a'rportion 5 An object of this inventionis to provide an of the `mechanism shown in Fig. 14.

. improved coal mining apparatus. Another ob` Fig-i6A is a transverse vertical sectional view ject is to provide anv improved" coal `mining aptaken substantially on line iB IB of Fig. 4. paratus ofthe combined horizontal, shear.- cut- Fig. 17 is a diagrammatic plan Yview showing `ter type having improved adjustable kerficut-f the mining apparatus making a horizontal cut l0 ting mechanism. Afurther object is to provide at the level of thefmine floor inaccordance with an improved adjustablekerf cutting mechanism thearcwall method.

for suchan apparatus whereby kerfs may be Fig. 18 is a diagrammatic plan View showing cut in the coal facerat any desired location bevthe mining apparatus making a shearingV cut tween the mine roof and mine floor.- and beat the rib. 1

tween the ribs of the entry. Another object Fig. 191s a diagrammatic plan View of the minis to provide` an improved adjustable support- Ming apparatus makinga shearing cut between ing structure forthe kerf cutter of a coal minthe center of the entry and the4 rib. `ing apparatus.. A further `object isV toprovidev Fig. 2G is -a diagrammatic plan view show- 20 in an apparatus` of the above characteran im` in'g the mining apparatus making a shearing cut 20 proved adjustable kerf cutting mechanism whereat the `center of the entry. by a horizontal kerf lmay be cut atthe level `of Fig. 21 is a diagrammatic plan view showing the mine floor outside and below thelevel ofY the,miningapparatusmaking a slabbing cut. the mine` trackway. .These and other objects; Fig. 22 is a diagrammatic lelevational'view 25 will,howevenhereinafter more fully appear.` K`showing the mining apparatus making a shear- 25 In the accompanying drawings there is shown, ing eut. t Y

- for purposes of illustration, `one*formjwhiclifthe f In this illustrative embodiment of the inveninvention may assume in practice.-

. tion'there is shown a coal mining apparatus of In these drawings, .t i

the combined horizontal and shear cutter, wheel Fig. l is a plan view of the illustrativeembodimounted, track supported and guided type, gen.-

ment of the improved mining apparatus. erallycomprising a self-propelled portable base I, Y Fig. 2 is a side elevational View of themining a horizontal turntable 2 mounted on the base for `apparatus shown in Fig. 1. adjustmentinto diiierent elevated positions rela- Fig. 3 is a horizontal sectional View taken tive to the base and for universal tilting movesubstantiallyon line 3 3 of Figs. 2, and 4. C mentrelative tothe base, and improved adjust- 35 Fig. 4 is. a central, longitudinally extending, able supportingstructure, generally designated 3, vertical sectional View takensubstantially on line *iorl supporting A a kerfcutting mechanism 4. 4 4 of Fig. 1. l Mounted on theturntable is a box-like armstruc- Fig. 5 is a detail verticalsectional view taken ture or Vextension frame 54 overhanging the for- 40 substantially-on lineVr 5 5 of Fig. 3. ward edge of the turntable supportingirame and 40 Fig. 6 is a horizontal sectional View taken on the base and havinglrotatably mounted thereon `line 0 6 of Fig. 4. l. 1 at its forward extremity an underslung head 6 Fig. 7 is a horizontal sectional View taken subfl disposed on aV horizontal axis located below Vthe stantially on line 'I l of Fig. 2. .Y top of the turntable and in turn having pivotally Fig. 8 ris `a vertical sectional `view taken on mounted thereon a swingable arm structure 1. 45 line 8 8 of Figs. 1 and 7. Pivotally mounted on the outer extremity of the Fig. 9 is a transverse sectional view taken sub- Y arm structure 'l is a swingable kerf cutter supstantially online 0 9 of Fig. 8. porti?. Suitable motor operateddevices are prof Fig.V 10 is a detail sectional view taken on videdY for elevating anduniversally .tilting the line i0 |0.of Fig.` 9. v "Y Fig.` 11 is a vertical sectional View` taken" sub#l adjustable supporting structure 3, for operating `stantially on line H ll of Figs. 1 and 12. the cutting mechanism 4, and for driving the Fig. 12 is a plan view of the mechanismlshown truck wheels for propelling the basa-as will herein Fig. 11,J parts being shown in horizontal secinafter be'described. tion to illustratefstructural details. f The base Iis herein in theformof-*a'wheeled 55 turntable, for rotatingthe head, forj operating the 'o0 truck of a well known type comprising a frame 9 supported o-n truck wheels I@ adapted to run along a mine trackway il. Supported on the truck frame at the rear of the turntable 2 is a motor I2, herein preferably of the reversible electric type, connected through a plural speed transmission mechanism, generally designated I3, t the truck wheels and through connections to be hereinafter described to the devices for elevating and tilting the turntable 2. Mounted at the rear end of the truck is a usual reeling device i4 for the power conductor cable I5 through which current is supplied to the motor i2 and a main driV- ing motor l5 mounted on the rotatable turntable structure. Also mounted on the truck frame is an electrical control apparatus il for the motors l2 and It.

Referring to the turntable mounting structure for the cutting mechanism, it will be noted that supported for vertical and universal tilting adjustments relative to the truck frame is a supporting frame l2, herein in the form of an annulus or ring having attached thereto a plurality of, herein three, depending brackets I9, the lower ends of which are shaped to engage, respectively, with upstanding guide members 20, herein in the form of screw pedestals, which are secured to the truck frame. Fixed to these depending brackets i9 are internally threaded nuts 2i (see Fig. 5) which are Vthreadedly engagedwith vertical screws 22 rotatably supported atvtheir upper ends-by the up- Vstanding guide members 2! and at their lower endsrin step bearings 23 formed in bearing brackets 24 attached to the bottom of the truck, frame. It will be noted that the nuts 2l are so connected tofthe feet of the depending brackets as to permit a slight relative rocking movement between the parts., The three sets of screws and guide membersconstitute'upright supports for the annularV supporting frame or ring I8, and the latter can be adjusted vertically in parallelism or angularlyto change its angle in altitude by suitable rotation of the screws. Mechanism for separately or simultaneously rotating the screws will be later described. The turntable 2 supported by the annular frame I8 is in the form of a circular casting which constitutes the main frame of the cutting mechanism. This casting forms the turntable rotatable about the center of the ring i8 and is guidedfor rotative movement in the ring by a depending annular ange 25 fitting the interior periphery of the ring I8 and by a radial ange 23 overlying the top surface of the ring.

Motor operatedl devices are employed for rotatingthe turntable 2, and herein comprise the motor IG, which is herein preferably of the reversible electric type suspended beneath the turntable casting within the lateral limits of the annular supporting frame I8 in the manner shown. The power shaft 2l of this motor is horizontally disposed and extends transversely across the turntable beneath the top surface of the latter, and. has fixed thereto a` bevel pinion 2d meshing with a bevel gear 29 xed to a vertical shaft 38 suitably journaled within the turntable casting. Fixed to and driven by the shaft 30 is a spur gear 3| meshing with a spur gear 32vsuitably fixed to a vertical shaft 33, herein arranged parallel with the shaft 30 and likewise suitably journaled within the turntable casting. Secured to the shaft 33 is a worm 34 meshing with a slow speed worm wheel 35v connectibie, by a multiple disc clutch 36 of `a usual design, to a horizontal shaft 3l. Fixed to and driven by the shaft 31 is a worm 38 meshingpasshownin Fig. 3,v with a WormY wheel 39 rotating about a Vertical axis and suitably journaled within the turntable casting. As shown in Fig. 4, this worm wheel drives a vertical shaft 48 connectible, by a clutch 4I, to a spur gear 42 supported by the shaft and meshing with the teeth of a circular rack 43 formed on the inner periphery of the annular supporting frame I8; the

Vgear 42 when released from the shaft 43 being freely rotatable on the shaft. Also meshing with the spur gear 3i is a spur gear 44 secured to a vertical shaft 45 arranged parallel with the shafts 33, 33 and disposed at the opposite side of the shaft 30 from the shaft 33, as shown in Fig. 3. Driven by and rotatable with the shaft 45 is a worm 46 meshing with a fast speed worm wheel 41. This worm wheel is connectible by a multiple disc clutch 48 similar to the clutch 36 to the shaft 3T. It will thus be seen that when the clutch 4l is connected and one or the other of the disc clutches 33, 4S is applied, the turntable 2 may lbe rotated relative to' the annular supporting frame i8 to swing the cutting mechanism about the `turntable axis at either. a relatively high positioning speed ora relatively low cutting speed. The teeth of the worm gears 38, 39 are self-locking and lock automatically the turntable against rotation when the clutches 36, 48. are released. The turntable'rel'ease clutch 4 i, that is the clutch for, freeing the turntable from the self-locking worm gearing, comprises, as shown in Figs. 4

and, clutch plungers 49. guided within slots Eil formed in the shaft 4D. Rotatably mounted with- .in theY shaft 4G isa clutch operating shaft 5l having an operating handle 52 and formed on its i When the shaft lower endapairof grooves 53. 5I is in the position shown in Fig. 4, the clutch plungers are projected within notches 54 formed in' the gear 42, thereby locking the gear to the shaft 4e. When the shaft 5I. is turned to bring notches 58 in registry" with the grooves 5D the clutch plungers are free to slide inwardly thereby to release the gear 42 from the shaft 4Q. The clutch 4|, whenA released, cuts loose, so to speak, the turntable from its rotating mechanism, thereby permitting the turntable to rotate freely relative to the annular supporting frame i3.

'.Nowf referring to the kerf cutting mechanism 4, and more particularly to the improved adjustable supporting structure therefor it will be observed that' formed integral with the box-like extension frame or arm structure 5 overhanging the annular frame |8,. and depending from the arm structure is a circular frame arranged in a substantially vvertical position and rigidly braced with respect to the arm by means of vertical webs 56.'Y As illustrated, secured to the circular frame 55' is ank annular retaining and bearing sleeve 51 having an inwardly directed iiange 5u. Between this flange and shoulder 53 formed on the circular frameA 55 there is rotatably mounted a sleeve E-l which herein. forms a rotatable support or neck for the rotatable head 6. This bearing sleeve'li is secured to a projecting neck frame 6| on which the adjustable supporting structure 3 for the cutting mechanism 4 is mounted, as will later be described.

Y 'Themechanism for effecting rotation of the cutter head frame. 6i about the axis of the neck herein comprises a bevel gear d2 fixed to the upper end of the shaft 3E! and meshing with a bevel gear 63 keyedto a horizontal shaft @4. The shaft 64 extends radially with respect to the turntable axis. and is suitably journaled within the turntable casting and circular frame 55. Fixed to the, shaft 54 is a spur gear 65 meshing `with a spur gear 66 keyed to 'a parallel shaft E' likewise suitably journaled within the turntable casting. V.Also fixed to the shaft t? is a bevel pinu ion iidmeshing with reverse bevels 69 and 'itl (see Fig. l5) These 'reverse bevels are selectively con- `nectible by friction clutches 'H andl respecwise suitably journaled within the turntable casting. Fixed to the forward end of the shaft i9 (see Fig. 3) is a spur` gear 8i) meshing with an internal gear Si herein formed integral with the rotatable support El) secured to` the cutter head frame t i. It will thus be seen that upon suitable application of thel friction clutches V"il, l2 the cutter head frame t! may be rotated about `the neck axis in one direction or the other to posi tion the cutting mechanism in a plurality of intersecting planes about the neck axis. The worin gearing ll, '18 is of the self-locking type and when the clutches are released, automatically locks the cutter head frame against rotation about the axis of the neck, thereby maintaining the cutting mechanismin any of its adjusted positions about the neck axis. `Now referring to the improved adjustable supporting structure 3 for the cutting mechanism, it

`willbe observedthat formed on `the rotatable neckframe'ii and extending forwardly there- :from are projections 55, 85 which are parallel to `each other and parallel to and equidistant from the axial line of the neck. `ln each of said projections is a bearing titi in alinement with the other of said bearings on a line` which is peri-V pendicular to and intersects the axial line of the' extends through the projections t9 and 85 within the bearings to forrnjournals for the arm 88, said `journals being on an axial line which is perpendicular` to and `intersects the axial line of the neck. `At its forward `end the arm 83 has a pair i f parallel projections Sil, Sli each of which is in `approximately the plane of the corresponding projections BSB, and each of these projections overlaps the inner face of one of a pair of projections Ql, 9i formed on a support el. on which the `kerf cutter is mounted. Supported withineach `of vthe projections SU, Slt is a bearing sleeve et,

and mounted within` these bearing sleeves is a transverse hinge shaft 94 arranged parallel to the shaft 8l. rIhese bearing sleeves in which 'the shaft M is supported project outwardly through' the side arms 9|, 9i formed on thercutter sup port $2 and form a pivotal mounting for the cutter support 92 as hereinafter described. Pivot ally mounted on the cutter support 92 about an axis perpendicular to the axial line` of the neck, in the manner hereinafter described, is an elongated plane cutter bar glcarrying on its margin fixed to a transverse shaft 25. `suitably journaled in bearing sleeves 25 supan endless cutter bitcarrying cutter chain 96, this cutter bar being swingable about its axis in planes parallel to the neck axis andin planes including the neck'axis. Y

The driving connections between `the motor i6 and the cutter chain t herein include the'bevel `gearing 2S, 29, vertical shaft 3i?, bevel' gearing 62, 53 and the horizontal shaft 54. Keyed to the forward end. .of the shaft 6d is a spur gear I) meshing with a spur gear Ili keyed to a shaft lili herein extending along the axis of theV neck and suitably journaled within the frames and 6 I. Fixed to the forward end of the neck shaft It is a bevel gear HB3 meshing with and driving a bevel gearil loosely mounted on the hinge shaft 3l. On the arm 38` are two bearings it, m5 which are on an axial line which. intersects the axial lines ofv the hinge Vshafts 3l' and ed, and the axial lline of the neck. In said bearings is journaled a transmission shaft llo" which has xed thereto at its rear end a bevel gear i3? meshing with anddiiven by the bevel gear IM, as shown in Fig. 7. Fixed to the forward end of the shaft illtis a bevel gear lull meshing with and driving a bevel gear its fixed tothe hinge shaft im. Journaled within the cutter support Q2, as sho-wn in Figs. 7 and 8, is a shaft Vi i@ having fixed thereto at its rear end a bevel gear l il meshing with and driven by the bevel Fixed to the forward end of the shaft llt, as shown in Fig. 11'," is a bevel gear` H2 meshing with a bevel gear H3 keyed to a shaft` iid suitably journaled within `the cutter support e2 and arranged with its axis perpendicular to the shaft llEl andthe axial line of the neck.

Keyed to the shaft l ld is a chain `sprocket `I l5 which engages and drives the cutter ch'ain 96 in the manner well understood in the art., The cutter ,support 92 comprises abody H6 and a cap member lil which is suitably secured to the body. The pair of projections Si, 9! is formed on the body HE. vThe body extends forwardly and has a bearing l H3V which receives one end of the shaft llhas shown in Fig. ll.. The cap member extends forwardly and has a bearing H9 in alinef ment with the bearing iii? and also receives the shaft IM. `Swivelly mounted on the bearings H3, H9 to swing about the axis of the shaft lift is a bar hanger frame or support i2@ which car- It will thus be seen that ries the cutter bar 95. the cutter bar Sie is pivoted to swing on the axial line of the shaft `i lli. i

The mechanism for swinging the cutter'bar herein comprises a worm wheel l2! loosely surrounding the bearing HESV and journaled on the cylindrical bearing engaging portion G22 of the hanger `support 26, as shown inFig. 1l. This worm wheel rests against a supporting plate 23 `and bears against the horizontal bar support, and

is adapted to be engaged with the cutter support by a latch mechanism to be hereinafter described. It will thus be seen that the worin wheel ili is arranged concentric'with `the, shaft Mii, and

meshing with this worm wheel is a worin ift The shaft i125 is ported within boss-like projections |21, l2? formed integral with the side arms Qi, 9i. The

mechanism for rotating the worm in either of opposite directions to swing thecutter bar in is suitably journaled within a gear housing |32 secured to the side of the cutter support @2. Splined to the shaft |3| is a jaw clutch member |33 which is operable to connect selectively .the reverse bevels to the shaft |5l. Keyed to the shaft 'e is a worm |315 (see Fig. 13) meshing with a worm wheel |35 keyed to the shaft |25 which drives the worm |24 meshing with the bar swinging worm wheel itl. It will thus be seen that the cutter bar may be swung in its plane about its pivot and that the cutter chain may be driven irrespective of the adjustment of the sup porting structure about the neck or the plane of operation of the cutter bar.

The latch mechanism for locking the hanger support lZil to the worm wheel iill or for releasing the hanger support for free swinging movement about the axis of the shaft i M herein comprises a latch |35 pivotally mounted at |31 on the hanger support it. The cap plate l is provided with a notch |36 for receiving the latch and allows said latch to rest between two teeth of the worm wheel |2l. Suitable means |39 is provided for maintaining the latch it in its locking position, this means its being readily releasable to permit swinging of the latch into its unlocked position. It will thus be seen that when the latch is in its locking position, as shown in Fig. 1i, and the worm wheel |22! is rotated through the mechanism above described, the cutter bar may swung with the worm wheel at a slow cutting speed. When the latch |36 is swung downwardly and released from the teeth of the worm wheel and the notch 38 in the cap plate, the cutter bar may be freely swung relative to the worm wheel. This latch mechanism may be the same as that described in the patent to Oldroyd l,46,076.

The mechanism for adjusting the improved supporting structure 3 to position the cutter bar in parallel planes while maintaining the cutter bar parallel to a line parallel to the neck axis or for tilting the cutter bar out of parallel relation with the neck axis comprises Worm racks |40 formed on the projections 85, 85 of the revoluble head structure. Meshing with these worm racks are parallel worms i4 |fi| keyed to parallel shafts |42, |42 suitably journaled within the arm 88, and in the present construction arranged with their axes perpendicular to the axial line of the hinge shaft 5l. Keyed to the shafts M2, E42 are worm wheels M3, |43 (see Fig. 9) which mesh with worms |44, Mii keyed to a transverse shaft |135 likewise suitably journaled within the arm 8S. Keyed to the shaft |45 intermediate its ends is a worm wheel M6 meshing with a worm |61 loosely mounted on the transmission shaft me. This worm is connectible to the shaft les by a suitable clutch i128 having suitable shipper mechanism |69 including a transverse shaft |59 carrying at its opposite ends operating handles |5| located at the opposite sides of the arm 88. Also formed on the projection 9|, 9| on the cutter support S2 are worm racks |52, |52 with which mesh worms |53, |53 keyed to parallel shafts |54, |54 suitably journaled within the forward end of the arm 8d. Keyed to these shafts are worm wheels It, |55 with which mesh worms |56, |56 keyed to a transverse shaft |51 herein arranged parallel with the shaft |45 and likewise suitably journaled within the arm 88. Fixed to this shaft intermediate its ends is a worm wheel |58 with which meshes a worm E59 (see also Fig. S) loosely journaled on the transverse shaft |05 and connecti le to the shaft by a clutch |60 similar to the clutch |48 and having similar operating mechanisin including handles |6| arranged adjacent Ythe handles |5| heretofore described. From the foregoing description it will be evident that when the worms it?, iBS are connected to the shaft G8 and the shaft it is connected to the motor, the worms MI, |4| meshing with the worm racks Mil and the worms |53 meshing with the worm racks |52 are simultaneously driven, causing the arm 8S to be swung about the axis of the hinge shaft 3l in one direction while the cutter support 92 is swung about the axis of the hinge shaft et in the opposite direction, the speeds of adjustment being so proportioned that as the supporting arm and cutter support are swung simultaneously about their respective axes the cutter bar 95 is maintained at all times parallel to a line parallel to the axial line of the neck. It will be evident that when the clutch ifs@ is disconnected and the clutch connected the cut ter support S2 may be swung about the axis of the hinge shaft 91% while the arm 53 remains stationary, thereby enabling the cutter bar to be tilted out of parallelism with the neck axis about an axis transverse to its length. It will also be evident that when clutch |58 is connected and the clutch lllt released the supporting arm may be swung about its axis while the cutter ort remains stationary as to movement ab meshing with the worm racks on the revoluble head frame and cutter support respectively are self-locking and maintain automatically the arm and cutter support in their different positions of adjustment about the axes of the hinge shafts.

Now referring to the mechanism for driving the truck wheels, it will be noted that fixed to the power shaft of the motor :2 is a worm 65 (see Fig. le) meshing with a worm wheel |56 rotatably mounted on a transverse shaft it? suitably journaled within a frame |653 suitably secured to the truck frame. This worm wheel may be operatively connected to the shaft |57 by means of a friction clutch |69 having suitable operating mechanism including a hand lever |70. -Fixed to this transverse shaft |51 is a brakJ drum il'l which is engaged by a brake band |12 also arranged to be controlled by the hand lever |78. When this hand lever is swung in one direction the clutch is applied and in the opposite direction the brake is applied and the clutch released. Journaled on this shaft Il'l is a spur gear H3 connectible with the shaft by a jaw clutch member |14, splined to the shaft,l and this gear meshes with a spur gear l'i. The spur gear iii is connected to a transverse shaft i suitably journaled within the frame |33. Keyed to the shaft |62 is a spur pinion l'i'l meshing with a spur gear H3 secured to a transverse shaft H9 (sce Fig. l5) arranged parallel with the shaft |67. Splined to the shaft i'it is a slidablc pinion |88 adapted to mesh with a spur gear li keyed to a sleeve 82 herein formed integral with the spur gear H73. If desired, operating mechanism may be provided for the clutch member |75. and the sliding pinion it@ so that when one is connected the other is released. As illustrated, secured to the shaft l'il is a chain sprocket |83 connected by an endless chain connection |36 to a chain sprocket secured to the rear truck axle. front and rear truck axles are connected together by a usual chain and sprocket connection |35. It will thus be seen that when the jaw clutch l'ill is shifted to connect the spur gear |13 to the shaft |61 and the pinion |25 is out its axis. The worms Mii, lll and |53, |53

The

l 2,607,908 of mesh-withthespur gear ll, the ltruck wheels ment with the spur gear tdi, the truck wheels may beldriven at a relatively slow speedappropriate for cutting through the reduction gearing lll, llt, ltand IBI. Upon reversal of the motor i2. the truck wheels may be driven to propel the apparatus in the reverse direction at either a relatively high or a relatively loW speed.

` The mechanism for driving the Aturntable elevatingand tilting screws 22 herein comprises a bevel pinion i8@ (see Fig.` le) journaled on the shaft it? and connectible to the shaft bythe clutch member lliil This bevel pinion meshes with a bevel gear ll fixed to a verticalshaft `itil suitably journaled within the frame 558. Keyed to the shaft H83 is aV chain sprocket l39 which engages and drives an endless transmission chain lie arranged beneath the truck frame.

Idler sprocketslld! and L92 serve to guide the chain mit relative to chain sprockets l93 rotat` ably mountedas shown in Fig. 5, upon each of the screws 22 at its lower end, and these sprockets are driven by the endless chain ltd. As shown, the sprockets 93' have formed thereon clutch teeth ld adapted to engage with similar teeth on clutch members H95 splined to the lower end of the screws. The screwsextend'downwardly through openings in the top plate of the truck frame and the clutchinembers 95 are each provided with a groove li in engagement with an armr l9l attached to a vertical operatingshaftV Hi8. The shafts i951 extendthrough the top plate' of the truck frame and are each providedwith a handle i9@ by which the movement of the clutch members may be controlled. lIt will thus be seen that when all the clutches'` l are in a position to connect the chain sprockets vi933 to the screws, the latter may be `simultaneously rotated tomove the turntable 2*together with the cutting mechanism supported thereby, into different elevated positions relative to the truck frame. It will also` be noted that byreleasing certain of these clutches and connecting certainI others the screws may be rotated to effect tilting movement of the turntable `about a horizontal axis to change its angle in altitude relativeto the truck frame.

The mode of operation of the improved mining apparatus `is as follows: The-apparatus is propelled along the mine trackway at a relatively high transport speed through the truck wheel driving gearing it, li, H3, H5 driven by the motor i2, it being understood at that time the adjustablesupporting structure 3 and the cutting mechanisme are swung upwardly from the full line position shown in Fig..2 to a position wherein `the cutter bar is` disposed above the level of the 'trackwayf Whenthe working face is' reached,

the high speed `truck'wheel drive is disconnected from the motor l2 by releasing the friction clutch it and the-slidingclutch VM. `If it is desired i to make a swinging cut atror near the level of the niineiloor in front of the end of the tracki way, the controlling clutches lil-3 and lufor the adjustable supporting structures are connected,

and upon running of the motor I6 in Vthe' proper,

direction, the supporting arm 88 'is swung downwai-ulyabout the axisof mening@ shaft a1 while 5 the cutter support 92 is simultaneously swung upwardly aboutthe axisof thehinge shaft 94 until the parts assume the position indicated in full lines in Fig. 2, the clutches itil, i-thereafter being released. With thecutter bar thus disposed the operator connects the proper reverseV bevel 1129, tofthe bar swinging mechanism to the shaft l 3i andthe cutter bar is swung in its plane through the bar swinging gearing 6M, H35, |24, l

l2! under the control of the clutch H33, the cutter bar swinging laterally about its pivot relative to is: swung transversely in its plane from right to leftacross .the .front end of the trackway at a relatively low cutting speedto make a swinging cut beneath the coal., When the tip end ofthe bar reaches a position adjacent the left hand rib the bar swinging clutch 133 is released, Vand upon release of the Vbrake lll, H2 the apparatus is propelled rearwardlyV along the mine trackway at a` low speed throughA the Y itt, it, Il?, lie, 185i', ll and H3, H5 driven by the motor i2 to move the `cutter bar away from the coal face. The cutter bar is thereafter swung into its central position shown `in Fig. l, and upon connection of the clutches Hi8, Hill and reversal ofthe motor/le, the adjustable supporting structures is swung upwardly to move the cutter bar into its transport position above therle'vel of the trackway. The apparatus is then propelled rearwardly along the mine trackway under the `propulsion ofthe high speed truck driving gearing- E65, N36, H3, H5 driven by the motor l2.

If it is desired to Acut a horizontal kerf at or near the level of the mine bottom outside andbelow the level of the mine trackway in accordance with the arcwall method, the operator applies,v

the friction clutch iiof thefast-speed turntable rotating mechanism, thereby rotating theJ turn-v table 2, together with the cutting mechanism supportedthereby, fromthe central position shown in Fig. i to the full line position indicated at `A in to the cutter support 9E under the controlof the.

clutch 633 of the bar swinging mechanism until the tip end of the cutter bar assumes the full line"A position shown in Fig. i7 adjacent the right hand rib at a less angle than the angleV of the arm 68 relative to the rib. When the posed with the bar pivot" lying outside the mine parts are thus dis.- i

bar is disposed adjacent the truck driving gearing Y trackway, the controlling*` clutches M3,- liiil for the;V

adjustable supporting structure Aare, connected therebyV movingv A.the cutter bar .at-,or near the j level' of the'mine oor as shown in full lines in Fig. 2, the clutches i133, ,itu thereafter being re. leased. Atpthat time, the cutting mechanism is connected in driving relation `with the motor and the cutter chain isv rapidly circulated about the margin'of the cutter bar S5. The pinion |80 of 6 the slow` speed truck driving mechanism is then slid into meshing engagement with the gear |8| and upon application of the friction clutch |69 the truck wheels are driven to propel the apparatus bodily in the forward direction along the inine trackway at a relatively slow cutting speed, sumping the cutter bar 95 beneath the coal until it assiunes the dotted line position indicated at B in Fig. 17. The friction clutch |69 is then released and the brake ITI, |12 set. The operator then applies the friction clutch 3S of the slow speed. turntable rotating mechanism and the turntable 2, together with the cutting mechanism supported thereby is rotated at a slow cutting speed to effect horizontal swinging movement of the cutter bar in its plane across the coal face to make a horizontal cut thereunder. During the initial rotative movement of the turntable 2 the cutter bar 95 is swung about its pivot under the control of the clutch |33 in the reverse direction until the parts assume a straight line position indicated at C in Fig. 17 wherein the cutter bar extends radially with respect to the turntable axis. When the cutter bar assumes the dotted line position indicated at D in Fig. 17 with its tip end adjacent the left hand rib and the swinging cut beneath the coal has been completed, the cutter bar is again swung about its pivot in a direction opposite from the direction of turntable rotation under the control of the clutch |33 while rotation of the turntable is continued, the turntable and cutter bar swinging simultaneously in opposite directions at that time until they assume an angular position with the cutter bar disposed at a less angle relative to the left hand rib than the angle of the arm 88 relative thereto, as indicated in dotted lines at E in Fig. 17. The clutches 3S and |33 and the brake |12 are then released, and upon application of the friction clutch |69 of the truck wheel drive and the reversal of the motor I2 the apparatus is propelled bodily rearwardly along the mine trackway at a low cutting speed, moving the cutter bar from the dotted line position indicated at E in Fig, 17 `to the dotted line position indicated at F in that figure, withdrawing the cutter bar from beneath the coal. After the completion of the cut beneath the coal the parts are again returned to their central transport position with the cutter bar disposed in an elevated position above the mine trackway.

A horizontal kerf may be cut at or near the level of the mine roof;` simply by applying one or the other of the friction clutches 1|, 12 of the head rotating mechanism to effect rotation of the head frame 6| about the neck axis, thereby moving the cutter bar through an arc of a circle from the full line position shown in Fig. 2 to its opposite horizontal position above'the head axis, as indicated in dotted lines in Fig. 2. To vary the elevation of the cutter bar when thus disposed,

the adjusting mechanism for the supporting structure 3 Ymay be connected in driving relation with the motor I6 thereby to effect swinging of the cutter bar upwardly or downwardly to the elevation desired. When the cutter bar is thus positioned it is sumped in, swung transversely in its plane and withdrawn from the coal in accordance with the usual arcwall method of cutting. By adjusting the supporting structure 3 the cutter bar may be disposed to cut kerfs in any desired horizontal planes between the mine roof and the mine floor.

To eiect a slabbing cut, the turntable 2 is rotated to move the adjustable supporting structure 3 laterally until the cutter bar assumes the cutter bar into the desired horizontal position.

When the cutter bar is disposed in the position shown in Fig. 2l the slow speed truck drive is connected in driving relation with the truck wheels and the apparatus is propelled rearwardly along the mine trackway to eiiect a slabbing cut in the coal.

It will be noted that during any of the horizontal cutting operations described above, for instance when it is desired to cut on a rolling or uneven bottom, or a pitching coal seam, the cutter bar may be tilted to change its angle in altitude simply by rolling the cutter head about its axis relative to the turntable structure and by swinging the cutter support 92 upwardly and downwardly in the desired direction about the axis of the hinge shaft 94. The cutting mechanism may also be universally tilted relative to the truck to change its angle in altitude simply by disconnecting certain of the elevating screws 22 from the motor i2 while others are rotated, thereby causing the turntable to be tilted relative to the horizontal. For instance if it is desired to tilt the tip end of the cutter bar downwardly, this may be accomplished by disconnecting the clutches from the front elevating screws 22 while the rear elevating screw is connected to the motor l2, thereby causing the rear edge of the turntable to be elevated. Conversely, if it is desired to tilt the tip end of the cutter bar upwardly, the rear elevating screw may be disconnected from the motor while the front elevating screws are rotated, thereby causing the forward edge of the turntable to be tilted upwardly.

A shear or vertical cut may be inserted in the coal face simply by applying one or the other of the reverse frictions ll, 'l2 of the head rotating mechanism, thereby rotating the head frame 6| about the neck axis to bring the cutter bar S5 into a position to swing vertically. When the cutter bar assumes the full line position indicated at G in Fig. 22 with the tip end of the cutter bar adjacent the mine roof, the apparatus is propelled bodily along the trackway, sumping the cutter bar within the coal until it assumes the dotted line position indicated at H in that figure. The cutter bar swinging mechanism is then connected, and the cutter bar is swung downwardly in its plane from the position indicated at H in Fig. 22 to the dotted line position indicated at I in that figure. lThe apparatus is then propelled rearwardly along the trackway to move the cutter bar from the position I to the position indicated in dotted lines at J in Fig. 22, withdrawing the cutter bar from the coal face. The cutter bar is sumped in, swung downwardly in its plane and thereafter withdrawn from the coal face in the manner similar to that described above in connection with horizontal cutting in accordance with the arcwall method. It will be noted that by rotating the head frame about the neck axis the cutter bar may be moved through an arc of a circle into shearing positions at either side of the neck axis, and when the cutter bar is thus disposed the adjustable supporting structure may be swung horizontally about the axis of the hinge shaft 81 to move the cutter bar from a center cutting position indicated at K in Fig. 2() laterally to the position indicated at L in Fig. 19, the turntable 2 remaining stationary at that time.` "It" it is' desiredV to increaseV "thel bY adjustment 4of the cutter support 92, the cutter bar may be positioned adjacent the rib asindicated atMin Fig. i8, theasupporting arm 8B being disposed in alinement with the arm structure of the turntable at that time. It will thus EL be seen Athat the cutter bar `may be disposed in any desired shearing position between the ribsof the 'entry including a position at the center of the entry and positions at either rib of the entry.V

To efr'ect a vertical or shearing cut in the mine wall when the apparatus is supported and guided by a curved trackway, the apparatus is operated in the following vmanner: With the cutter bar 95 in shearing position thev turntable 2 is rotated 26,2? to move the 'cutting mechanism laterally until `the tip end oi thev cutter bar engages the rib ofV the entry. The turntable is then locked against rotation the cutter bar is swung upwardly to a position adjacent the mine roof. When the parts are thus disposed the apparatus is propelled along the curved trackway at a low speed to cause the tip end of the cutter bar to penctrate the coal. `The turntable clutch el is then released and the turntable is permitted to rotate freely relativoto the truck as the apparatus is propelled-bodily along the trackw'ay, and as a result, as the apparatus moves along the curved traclrway the cutter bar is sumped within the coal in the manner well known to those skilled l in the art, the free rotation. oi the turntable Vrelative to thetruck as the latter moves along the trackway preventing binding oi the cutter bar vin the lzerf. `'Ihe cutter bar is then swung downwardly in its plane and withdrawn from the coal to complete the shearing cut.

, As a result of .this invention, it will be noted that an improved coal mining apparatus is providedhaving improved adjustable kerl cutting mechanism wherebyhorizontal keris may be cut @at or near theV level of the mine iioor outside and below the level of the mine trackway, and vertical kerfs may be out at `any desired location between the ribs of the entry. It will iurther be notedthat by the provision` of the imr. provedadjustable supporting .structure for the lrerfcutting mechanism, the cutter bar may be positioned `to cut keris in any desired horizontal planes between the minetrooi and the mine 'floor or in.V any desired vertical planes between t; the ribs ci. the entry. It will also be evident' that by the provision'of the improved adjustable supporting structure and the tiltable turntable mounting forithe kerl` lcutting mechanism the cutter bar `may. be universally [tilted to change its angle "in altitude thereby to accommodate itself to a rolling or unevenbottom or pitchingV coal seam. It will still further be notedithat an improved coal mining apparatus is provided wherein the adjusting mechanism :for the keri 651e cutting mechanism is extremely exible, it being.

possible to operate-the apparatus as a mounted bottom cutter, top cutter, center cutter, shear, cutter and'slabbin'g'machine and to operate the .y

apparatus to make shear cuts while the appadlratusis supported and guided by a' curvedtrackway,` thereby enabling the apparatus to `accorni modate itself to `practically every mining condition encountered within` theV normal workingran'ge oi actrack cutting machine. These and v75ii'other,uses and advantages oijthe ,improved mining apparatus will be clearly apparent to those skilled in the art. Y

While there is in this application speciiically described one form which the invention may assume in practice, it will beunderstood that this form oi the same is shown for purposes oi illustration and that the invention may be ,modiiiedV and embodied in various other forms without departing from vits spirit or the scope of the appended claims. i Y

What I claim as `newand desire to secure by Letters Patent is: p Y

Lin a mining apparatus, a portable base, a supporting structure-swingable horizontally rele ative to said portable base, a support mounted on said supporting structure to rotate relative thereto about a horizontal axis, an arm structure pivotally moun'ed on said support to swing relative thereto, a kerf cutter support swingablyA mounted on the outer extremity of said arm structure, said cutter support being swingable rela-,- tive to said arm structure to move the kerl cutter into angularly related cutting planes, and motor operated, operator controlled means for swinging said cutter support relative to said arm` structure whilethe latter remains stationary as regards swinging movement relative to said first, support.

2. In a mining apparatus, a portable b ase, a supporting structure swingable horizontally relative to said portable base, a support mounted.V on said supporting structure to rotate relative thereto about a horizontal axis, an arm structure` pivotally mounted on said support to swing relative thereto, a kerf cutter support swingaoly mounted on the outer extremity of `said arm' structure, said cutter support being swingable relative to said arm structure` to move the korf cutter into angularly related VVcutting planes, and motor operated, operator controlled means ior independently swinging said arm structure relative to said support and said cutter support rel-` ative to said arm structure.

3. In a mining apparatus, a portable base, a supporting structure swivelly mounted on said base `to swing horizontally relative thereto about a vertical axis, a support mounted on said supporting structure to swing horizontally relative thereto about a parallel axis, a korf cutter sup-v port swivelly mounted on the outerextremity oi said support Ato swing-relative thereto about an axis parallel with' said axes, a keric cutter pivotally mounted on said cutter support-to swing in a vertical plane relative thereto about a horizontal axis, and motor operated, operator con. trolled means for swinging said cutter support relative to said first support while the latter remains stationary as regards swinging movement relative to said Supporting structure.V

4C. In a mining apparatus, a portable base, a supporting structure swivelly mounted on said base to swing horizontally relativethereto about a vertical axis, a support mounted on said supporting structure tokswing horizontally relative thereto about a parallel axis, a kerf cutter support swivelly mounted on the outer extremity of said support to swing relative thereto about an axis parallel with said axes, a keri'cutter pivotally mounted on said cutter support to swing in a Vertical plane relative thereto about a horizontal axis, andmotor operated, operator controlled means for independently swingingisaid rst support relative to said supporting structure and said cutter support relative to said rst support.. f

supporting structure swivelly mounted on said base to swing horizontally relative thereto about a vertical axis, a support mounted on said supporting structure to swing horizontally relative thereto about a parallel axis, a kerf cutter support swivelly mounted on the outer extremityoi said support to swing relative thereto about an axis parallel with said axes, a korf cutter pivotally mounted on said cutter support to swing in a vertical plane relative thereto about a horizontal axis, and motor operated, operator controlled means for independently swinging said rst support relative to said supporting structure and said cutter support relative to said first support, said iirst support being swingable relative to said base about the axis of said supporting structure or relative to said supporting structure about said parallel axis.

6. In a mining apparatus, a portable base, a supporting structure swivelly mounted on said base to swing horizontally relative thereto about a vertical axis, a support mounted on said supporting structure to swing horizontally relative thereto about a parallel axis, a lierf cutter support swivelly mounted on the cuter extremity of said support to swing relative thereto about an axis parallel with said axes, a keif cutter pivotally mounted on said cutter support to swing in a vertical pla-ne relative thereto about a horizontal axis, and motor operated, operator controlled means for independently swinging said first support relative to said supporting structure and said cutter support relative to said first support, said iirst support being swingable relative to said base about the axis of said supporting structure or relative to said supporting structure about said parallel axis and said cutter support being swingable relative to said rst support while said latter support remains stationary.

7. In a mining apparatus, a portable base, a supporting structure swivelly mounted on said base to swing horizontally relative thereto about a vertical axis, a support mounted on said supporting structure to swing horizontally relative thereto about a parallel axis, a kerf cutter support swivelly mounted on the outer extremity of said support to swing relative thereto about an axis parallel with said axes, a kerf cutter pivotally mounted on said cutter support to swing in a vertical plane relative thereto about a horizontal axis, said cutter support being swingable relative to said first support while the latter remains stationary, and motor operated, operator controlled means for swinging said cutter support relative to said first support and for swinging said kerf cutter in its piane.

8. In a mining apparatus, a portable base, a supporting structure swivelly mounted on said base to swing horizontally relative thereto about a vertical axis, a support mounted on said supporting structure to swing horizontally relative thereto about a parallel axis, a kerf cutter support swivelly mounted on the outer extremity of said support to swing relative theretol about an axis parallel with said axes, a korf cutter having motor operated .swinging means and pivotally mounted on said cutter support to swing in a vertical plane relative thereto about a horizontal axis, said first support being swingable relative to said supporting structure while the latter remains stationary as regards swinging movement about its own axis relative to said base, and motor operated. operator controlled means for swinging said first support relative to said supporting structure and for swinging said cutter support relative to said iirst support, said cutter support being swingable relative to said first support while the latter remains stationary as regards swinging movement about its own axis.

9. In a mining apparatus, a portable base, a supporting structure mounted on said base to swing horizontally relative thereto, a support mounted on said supporting structure to rotate relative thereto about a horizontal axis, a second support mounted on said rst support to swing relative thereto about an axis at right angles to the axis of said rst support, a kerf cutter support pivotally mounted on the outer extremity of said second support to swing relative thereto about an axis parallel with the axis of said second support, a kerf cutter pivotally mounted, on said third support, and motor operated, operator controlled Ymeans for swinging said cutter support relative to said second support while the latter remains stationary as regards swinging movement about its own axis.

10. In a mining apparatus, a portable base a supporting structure mounted on said base yto swing horizontally relative thereto, a support mounted on said supporting structure to rotate relative thereto about a horizontal axis, a second support mounted on said iirst support to swing relative thereto about an axis at right angles to the axis of said rst support, a kerf cutter support pivotally mounted on the outer extremity of said second support to swing relative thereto about an axis parallel with the axis of said second support, a korf cutter pivotally mounted on said third support, and motor operated, operator controlled means for independently swinging said second and third supports about their respective a es.

l1. In a mining apparatus, a portable base, a supporting structure mounted on said base to swingV horizontally relative thereto, a support mounted on said supporting structure to rotate relative thereto about a horizontal axis, a second support mounted on said i'irst support to swing relative thereto about an axis at right angles to the axis of said irst support, a kerf cutter support pivotally mounted on the outer extremity of said second support to swing relative thereto about an axis parallel with the axis of said second support, a kerf cutter pivotally mounted on said third support, and motor operated, operator controlled means for independently swinging said second and third supportsr about their respective axes, said third support being swingable relative to said second support while the latter remains stationary.

12. In a mining apparatus, a portable base, a supporting structure mounted on said base to swing horizontally relative thereto, a support mounted' on said supporting structure to rotate relative thereto about a horizontal axis, a second support mounted on said first support to swing relative thereto about an axis at right angles to the axis of said first support, a kerf cutter support pivotally mounted on the outer extremity of said second support to swing relative thereto about an axis parallel with the axis of said second support, a korf cutter pivotally mounted on said third support, and motor operated, operator controlled means for independently swinging said second and third supports about their respective axes, said second support being swingable relative to said first support while the latter remains stationary.

lso

13. In a miningapparatus, aportablebase, a Supporting Structure mounted on said base to swing horizontally relative thereto, a support mounted on said supporting structurel to rotate relatively thereto about `a horizontalaxis, a second support mounted on said rst support to swing relatively thereto about an axis at right angles to the axis of said first support, a kerf cutter support pivotally mounted on the outer extremity of said second support to swing relatively thereto about an axis parallel with the axis of said second support,` a kerf cutter pivotally mounted 'on said third support, and motoroperated, operator controlled means for independently swinging said second and third supports about theirrespeetive axes, said third support being swingable relative to said second support while the lattei` remains stationary and said second support being swingable relative to said first supportwhile the latter remains stationary. i i

14. In a mining apparatus, a portable base; a horizontal `turntable mounted on said base `to swing relative thereto about a vertical` axis, a single arm pivotally mounted on said turntable to swing relative thereto about avparallel axis, a

keri `cutter support pivotally mounted on theouter extremity of said arm to swing relative thereto about an axis parallel withwsaid axes, said arm constituting. the sole swingable supporting connection between the turntable and cutter support, and a kerf cutter Ypivotally mounted on said cutter support to swing in a `verticalplane relative thereto about a horizontal axis.

15. in a mining apparatus, a portable base, a horizontal turntable mounted on said base to swing relatively thereto about a vertical axis, a single arm pivotally mountedlon said turntable to swing relatively tlfieretolabout` aparallel axis, a keri cutter support pivotally mounted on` the` outer extremity of said arm'to swing relatively thereto about an axis parallel with said axes,

`said arm constituting the sole swingable supn porting connectionv between the turntable andA cutter support, and a kerf cutterv pivotally mount-v ed on said cutter supportto swing` in avert1cal planerelatively thereto about aihorizontal axis;

said cutter support being swingable about'its axis relative to said arm `while the latter remains stationary. i i Y 16. In a mining apparatus, a portable base, `ahorizontal turntable mounted on said base to swing relatively thereto about a vertical `ax1sa` single arm pivotally mounted on said turntable toswing relatively thereto about a parallel axis, a kerf cutter support pivotally mounted on. the outer extremity of said arm to swingrelatwely thereto about an axis parallel with 'said axes, said arm constituting thefsole swingable -supporting connection between the turntable and cutter support, and a kerf cutter pivotally mountedon said cutter support'to swing in a vertical plane relative thereto about a horizontal axis, said arm being swingable about the turntable axis relative to the base and said cutter'support being independently swingable relative to said arm during swinging of said arm about the turntable axis. i i

1'7. In a mining apparatus, a `portable base, a horizontal turntable mounted on said base -to swingV relatively thereto-about a vertical axis, a cutter head mounted on said turntable to `rotate relatively thereto about a horizontal axis, asingle arm pivotally mounted on `said cutter head to swing relatively'thereto about an axis at right an-` gles to the cutter head axis, `a lrerf cutterfsupu port 'pivotally mounted on the outer extremity of" said arm to swing relatively thereto about an axis parallel with said arm axis, said arm constituting the sole supporting connection between the cut ter head and cutter support, and a k'erf` cutter` pivotallymounted on said cutter support to swing relatively thereto about an axis at right angles to a line parallel to Va line parallel to said cutterI support axis. f-

18. In amining apparatus, a portable base, a

horizontal `turntable mounted on said base toi swing relatively thereto about a vertical axis, a cutter head mounted on said turntable to rotateV relatively thereto about a horizontal axis, a single arm pivotally mounted on said cutter head to swing `relative thereto about an axis at right angles to the cutter head axis, a keri` cutter support pivotally mounted on the outer extremity of said arm to swing relatively thereto about an axis parallel with said arm axis, said arm, constituting the sole supporting connection `between the cutter head and cutter support, and a kerf cutter pivotally mounted on. said cutter support to swing relativelyVv theretoabout an axisat right angles to aline parallel to a line parallel. to said cutter support axis, `said cutter support being swingable about itsaxis relative to said arm while the latter remains stationary. Y

19. In a miningapparatus, aportable base, a

horizontal turntable mounted on said ,base to portrpivotally mounted on the` outer extremity oi said armto swing relatively thereto about an axis parallel with said arm axis, said arm constituting the solelsupporting conneetionrbetween the cut` ter head andcutter support, and a kertcutter pivotally mounted `on said cutter support to swing relatively thereto about an axis at right `angles to a line parallel to a line parallel to said cutter support, axis, said cutter support being swingable about its axis relative to said arm while the latter 'remainsistationarm said arm being swingable about the turntable axis relative to the base and said cutter support being independently .swing-A. ablerelative to said arm during swinging of said arm about the turntable axis. M *Y v 20. Inafmining apparatus, a portablebase; a horizontal'turntable mounted on saidbase for rotation about a vertical axis relativelytliereto, a cutter head mounted on said turntable to rotate relativelyfthereto about an axis extendingradially with respect` to the axial lineof the turntable, an` arm pivotally mounted on said cutter headto swing relativelythereto about an axis atright; angles. to theYV head axis, a kerf cutter, support pivotally mounted on the outerextremity ofsaid arm to `swing relatively thereto about an axis para allel tothe arm axisand a kerf cutter pivotally mounted on said cutter support to swing relatively thereto about an axis at right angles to a 'line parallel to a line parallel to the axis of said cutter support, saidl turntable being rotatable, and Y ture for said kerf cutter adjustable to position the same in a plurality of parallel planes within certain limits and in other parallel planes outside said limits, said supporting structure including supporting elements adjustable relative to the base about parallel axes spaced longitudinally of said base, said kerf cutter adjustable upon adjustment about the front axis into parallel cutting positions to cut parallel kerfs within certain limits and adjustable upon adjustment about the rear axis into parallel cutting positions parallel with aforesaid cutting positions to cut parallel kerfs outside of said limits.

22. In a mining apparatus, a portable base, a kerf cutter, and an adjustable supporting structure for said kerf cutter adjustable to position the same in a plurality of parallel planes within certain limits and in other parallel planes outside said limits, said supporting structure including supporting elements adjustable relative to the base about parallel axes spaced longitudinally of said base, said kerf cutter adjustable upon adjustment about the front axis into parallel cutting positions to cut parallel kerfs within certain limits and adjustable upon adjustment about the rear axis into parallel cutting positions parallel with aforesaid cutting positions to cut parallel keris outside of said limits, said supporting structure also including means for supporting the kerf cutter for adjustment about a longitudinal axis into horizontal and vertical cutting positions.

23. In a mining apparatus, a portable base, a kerf cutter, and an adjustable supporting structure for said kerf cutter adjustable to position the same in a plurality of parallel planes within certain limits and in other parallel planes outside said limits, said supporting structure including supporting elements adjustable relative to the base about parallel axes spaced longitudinally of said base, said kerf cutter adjustable upon adjustment about the front axis into parallel cutting positions to cut parallel kerfs within certain limits and adjustable upon adjustment about the rear axis into parallel cutting positions parallel with aforesaid cutting positions to cut parallel kerfs outside of said limits, said supporting structure also including means for supporting the kerf cutter for adjustment about a longitudinal axis extending radially from said rear axis to move the kerf cutter into horizontal and vertical cutting positions.

24. In a mining apparatus, a portable base, a kerf cutter, and an adjustable supporting structure for said kerf cutter adjustable to position the same in a plurality of parallel planes within certain limits and in other parallel planes outside said limits, said supporting structure including supporting elements adjustable relative to the base about parallel'axes spaced longitudinally of said base, said kerf cutter adjustable upon adjustment about the front axis into parallel cutting positions to cut parallel kerfs within certain limits and adjustable upon adjustment about the rear axis into parallel cutting positions parallel with aforesaid cutting positions to cut parallel kerfs outside of said limits, said supporting structure also including means for adjusting the kerf cutter into a position to cut a horizontal kerf at the level of the mine bottom.

25. In a mining apparatus, a portable base, a kerf cutter, and an adjustable supporting structure for said kerf cutter adjustable to position the same in a plurality of parallel planes within certain limits and in other parallel planes outside said limits, said supporting structure including supporting elements adjustable relative to the base about parallel axes spaced longitudinally of said base, said kerf cutter adjustable upon adjustment about the front axis into parallel cutting positions to cut parallel kers within certain limits and adjustable upon adjustment about the rear axis into parallel cutting positions parallel with aforesaid cutting positions to cut parallel kerfs outside of said limits, said supporting structure also including means for adjusting the kerf cutter into a position to cut a horizontal kerf at the level of the mine bottom outside the path of movement of the base and in advance of said base.

26. In a mining apparatus, a portable base, a kerf cutter, and an adjustable supporting structure for said kerf cutter including supporting elements swingable horizontally relative to the base about parallel axes spaced longitudinally of the base and for adjusting the kerf cutter into 1 horizontal and shearing positions about an axis extending radially from the rear axis of horizontal swinging movement, said kerf cutter adjustable upon adjustment about the forward axis of horizontal swinging movement into positions i porting elements adjustable about parallel axes spaced longitudinally of said base, said kerf cutter adjustable upon adjustment about the front axis into parallel shear cutting positions within certain limits and adjustable upon adjustment about the rear axis into parallel shear cutting positions parallel to said rst mentioned positions and outside or said limits and at either side of the base whereby the shearing range of the kerf cutter is extended.

28. In a mining apparatus, a portable base, a

kerf cutter, and an adjustable supporting structure for said kerf cutter, said supporting structure including supporting elements adjustable relative to the base about parallel axes spaced longitudinally of the base, said kerf cutter adjustable upon adjustment about the front axis into parallel cutting positions to cut parallel kerfs within certain limits within the sides of said base and beyond the sides of said base, said kerf cutter adjustable upon adjustment about the rear axis into parallel cutting positions parallel with aforesaid cutting positions to cut parallel kerfs outside of said limits and beyond the outermost range of aforesaid adjustment about said front axis.

29. In a mining apparatus, a portable base, a shearing kerf cutter, and an adjustable supporting structure for said kerf cutter including a supporting element adjustable about parallel axes spaced longitudinally of said base, said kerf cutter adjustable upon adjustment about the front axis into parallel shear cutting positions within certain limits between the sides of said base and beyond the sides of said base, said kerf cutter adjustable upon adjustment about the rear axis into parallel shear cutting positions parallel to said first mentioned positions and outside of said limits beyond the outermost limits of adjustment about said front axis whereby the shearing range of the kerf cutter is extended.

" '30. `In a mining apparatus, alportablebasega ture including supporting elements adjustable relative to the base about parallel vertical` axes spaced longitudinally` of the base, said kerf cutter adjustable upon adjustment about the front axis into` parallel cutting positions to cut Vparallel kerfs within certain limits within the sides of said. base and beyond the sides of said base, said `kerf cutter adjustable upon adjustment about the rear axis into parallel cuttingxpositions `parallel with aforesaid cutting positions to cutparallel kerfs outside of said limits and lbeyond the outermost range of aforesaid adjustment about said'front axis. l Y i v l 3l.` In `a mining apparatus, a portable base,'a shearing kerf cutter, and an adjustable supporting structure for said kerf cutterincluding supporting elements adjustableabout parallel vertical axesspaced longitudinally of said base, said kerf cutter adjustable upon adjustment about the front axis into parallelshear'cutting@positions Within certain limits between the l"sides of `said base and beyond the' sidesofsaid base, said kerf cutter adjustable upon adjustment about the rear axis into parallel shear cuttingfpositions parallel to said iirst mentioned positionsA and outside-ofV said limits beyond the outermost limits of adjustment about said front axis whereby the shearingrange of the kerf cutter is extended.` i 1" l 32. In a mining apparatus,` a portable basef'a kerf cutter, and an adjustable" supportingstructure for said kerf cutter, said-supporting structure .i including supporting Ielements adjustable relative to the base about Vparallel vertical laxes spaced longitudinally of the base, the rearrnost of `said axes lying in the longitudinali-vertical center of the machine, said kerf cutter adjustable upon vadjustment about the front axis into parallel cutting positions Vto fout pa'rallel-kerfs: within certainlimits within the sides of said base and beyond the sides vof saidbasefsaid kerf cutter adjustable upon-adjustment about the `rear axis in parallel cutting positions parallel with aforesaid cutting positions to cut parallel kerfs outside of said limits and beyond the outermost rrange of aforesaid adjustment about said iront axis. f

33. In a mining apparatus, a portable base, a shearing kerf cutter, and an adjustable supporting structure for said ker-frcutter includingsupporting elements adjustable aboutparallel `vertical axes spaced longitudinally of saidlbasathe rearmost ofwsaid axes lying in the longitudinal vertical center of the machina'said kerf cutter adjustable upon adjustment aboutthe front axis into parallel shear cutting positionslwithin certainv limits between the sides of saidbase and beyond the sides of said base, said kerfcutter adjustable upon adjustment about'the rear axis into `parallel shear .cutting positions parallel'to said first mentioned positions and outside of said limvits beyond the outermost limits of adjustment `about said front axis whereby the shearing range of thekerf cutter is extended.

34.. In a mining apparatus, a portable base, a horizontal turntable' on saidV base, a support mounted on said base for rotation relative thereto about a horizontal axis extending radially `with respect to the turntable axis, an `arm pivotally mounted on said support to swing relative thereto `about an axis at right angles tothesupport axis, a second support pivotally mounted on the outer extremity of said arml to swing relative thereto about an axis parallel with-*the arm pivot axis, anda kerf cutter pivotally mounted on said second support to swing relativeV thereto about an axis at right angles to a line parallel to a line parallel to the axis of said second support, said kerf cutter being'swingable with `said second support through a relatively widerange while the arm remains stationary as. regards,

swinging movement about `its own axis; i

35. `ln a mining apparatus, a portable base, a horizontal turntable on said base, a support mounted on said base for rotation relative thereto about a horizontal axis extending radially with respect to. the `turntable axis, an arm pivotally mounted on said support to swing relative thereto about an axis at right angles to the support axis, a second support pivotally mounted on the outer` extremity of Vsaid arm to swing relative thereto about an axis parallel with the arm y pivot axis, a kerf cutter pivotally mounted on said second support to swing relative thereto about an axis at right angles to a line parallel to aline parallel to the `axis of said second support, and a motoivon said turntable for rotating saidrst support, for swinging said 'arm relative to said rst support, for swinging said second support f relative to said arm while the latter is stationary and for swinging said kerf cutter about its pivot; ,36. In a mining apparatus, a portable base, a horizontal turntable on said base, a `support mounted on said base for rotation relative there-- to'about a horizontal axis extending radially with respect to the turntable axis, an arm pivotally mountedon said support to swing relative thereto about an axis at right angles to the support'axis, a second support pivotally mounted on the outer extremity of said arm 'to swing relative thereto about anaxs parallel with the arm pivotl axis, a kerf cutter pivotally mounted on said second support to swing relative thereto about an axis at right angles to a line parallel to a line parallel to the `axis of said second support, and a motor on said, turntable `for rotating said turntable relative to the base, for rotating saidrst support relative to the turntable, for swinging said'army relative to said first support, for swinging said second support relative' to said arm while the latter is stationary and for swinging said kerf cutter aboutfits pivot relative to said second support.

, a l.37.In a mining apparatus, a portable basava horizontal turntable on said base, mechanism for adjusting said turntable into diierent elevatedr positions, relative to thebase, aisupport mounted on said turntable for `rotation relative thereto about an axis extending radially with respect to the turntable axis, an arm pivotally mounted on said support to swing relative thereto aboutan'axisat right angles to said support axis, a

secondY support pivotally mounted on 4the outer' extremity Vof said arm to swing relative theretoV independently thereof about an axis parallel with'the arm pivot axis, and a kerf cutter pivotally mounted on said second support to swing relativeY thereto about an axis at right angles to a line parallel to a line parallel to the axis of said second support,

, 38,'In a mining apparatus, a Vportable base,

the outer extremity of said arm to swing rela?, tive thereto about an axis parallel with the arm pivot axis, a kerf cutter pivotally mounted on said second support to swing relative thereto about an axis at right angles to a line parallel to a line parallel to the axis of said second support, and a motor on said turntable for rotating said rst support, for swinging said arm relative to said rst support, for swinging said second support relative to said arm independently of swing of the latter andfor swinging said kerf cutter about its pivot.

39. In a mining apparatus, a portable base, a horizontal turntable on said base, mechanism for adjusting said turntable into different elevated positions relative to the base, a support mounted on said turntable for rotation relative thereto about an axis extending radially with respect to the turntable axis-an arm pivotally mounted on said support to swing relative thereto about an axis at right angles to said support axis, a second support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, a kerf cutter pivotally mounted on said second support to swing relative thereto about an axis at right angles to a line parallel to a line parallel to the axis of said second support, and a motor on said turntable for rotating said turntable relative to the base, for rotating said rst support relative to the turntable, for swinging said arm relative to said iirst support, for swinging said second support relative to said arm independently of swing of the latter and for swinging said kerl cutter about its pivot relative to said second support.

40. In a mining apparatus, a portable base, a horizontal turntable on said base, mechanism for adjusting said turntable into different elevated positions relative to the base and for tilting the turntable about a transverse axis relative to the horizontal, a support mounted on said turntable for rotation relative thereto about an axis extending radially with respect to the turntable axis, an arm pivotally mounted on said support to swing relative thereto about an axis at right angles to said support axis, a second support pivotally mounted onrthe outer extremity of said arm to swing relative thereto independently thereof about an axis parallel with the arm pivot axis, and a kerf cutter pivotally mounted on said second support to swing relative thereto about an axis atright angles to a line parallel to a line parallel to the axis of said second support.

41. In a mining apparatus, a portable base, a horizontal turntable on said base, mechanism for adjusting said turntable into different elevated positions relative to the base and for tilting the turntable about a transverse axis relative to the horizontal, a support mounted on said turntable for rotation relative thereto about an axis extending radially with respect to the turntable axis, an arm pivotally mounted on said support to swing relative thereto about an axis at right angles to said support axis, a second support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, a kerf cutter pivotally mounted on said second support to swing relative thereto about an axis at right angles to a line parallel to a line parallel to the axis of said second support, and a motor on said turntable for rotating said rst support, for swinging said arm relative to said first support,

for swinging said second support relative to said arm independently of swing of the latter and for swinging said kerf cutter about its pivot,

42. In a mining apparatus, a portable base, a horizontal turntable on said base, mechanism for adjusting said turntable into different elevated positions relative to the base and for tilting the turntable about a. transverse axis relative to the horizontal, a support mounted on said turntable for rotation relative thereto about an axis extending radially with respect to the turntable axis, an arm pivotally mounted on said support to swing relative thereto about an axis at right angles to said support axis, a second support pivotally mounted on the outer. extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, a kerf cutter pivotally mounted on said second support to swing relative thereto about an axis at right angles to a line parallel to a line parallel to the axis of said second support, and a motor on said turntable for rotating saidturntable relative to the base, for rotating said rst support relative to the turntable, for swinging said second support relative to said arm independently of swing of the latter and for swinging said Vkerf cutter about its pivot relative to said second support.

43, In a mining apparatus, a portable base, a horizontal turntable on said base, mechanism for adjusting said turntable into different elevated positions relative to the base and for universally tilting the turntable relative to the horizontal, a support mounted on said turntable for rotation relative thereto about an axis extending radially with respect to the turntable axis, an arm pivotally mounted on said support to swing' relative thereto about an axis at right angles to said support axis, a second support pivotally mounted on the outer extremity of said arm to swing in dependently relative thereto about an axis parallel with the arm pivot axis, and a kerf ,cutter pivotally mounted on said second support to swing relative thereto about an axis at right angles to a line parallel to a line parallel to the axis of said second support.

44. In a mining apparatus, a portable base, a horizontal turntable on said base, mechanism for adjusting said turntable into different elevated positions relative to the base and for universally tilting the turntable relative to the horizontal, a ,f

support mounted on said turntable for rotation relative thereto about an axis extending radially with respect to the turntable axis, an arm pivotally mounted on said support to swing relative thereto about an axis at right angles to said support axis, a second support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, a kerf cutter pivotally mounted on said second support to swing relative thereto about an axis at right angles to a line parallel to a line parallel to the axis of said second support, and a motoron said turntable for rotating said rst support, for swinging said arm relative to said first support, for swinging said second support independently relative to said arm and for swinging said kerf cutter about its pivot.

45,. In a mining apparatus, a portable base, a horizontal turntable on said base, mechanism for adjusting said turntable into dirlerent elevated positions relative to the base and for universally tilting the turntable relative t0 the horizontal, a support mounted on said turntable for rotation relative thereto about an axis extending radially with respect to the turntable aXS, an arm DiV- otally mounted on said support to swing relative thereto about an axis at right angles to said support axis, a second support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot a kerf cutter pivotally mounted on said second support to swing -relative thereto about an axis .at right angles to a line parallel to a line parallel to the axis `of said second support, and a motor on said turntable for rotating said turntable relative to the base, for rotating said iirst support relative to the turntable, for swinging said second support relative to said arm independently of swing of the latter and for swinging said kerf cutter about its pivot relative to said second support.

46. In a mining apparatus, a portable base, a shearing kerf cutter, andan adjustable supporting structure for said kerf cutter including supporting elements adjustable about parallel axes spaced longitudinally of the base, said lcerf cutter adjustable upon adjustment about the front axis into parallel shear cutting positions between the sides of the base and beyond the sides of the base, said kerf cutter adjustable upon adjustment about the rear axis into parallel shear cutting positions parallel to said first mentioned positions and outside of said limits, said kerf cutter adjustable to cut parallel shearing kerfs at either rib of an entry of a width equal to more than twice the width of the apparatus.

47. In a mining apparatus, a portable base', a frame overlying said base and swingable horizontally relative thereto about a vertical axis, said frame overhanging the forward end` of said base, a support pivotally mounted on the outer overhanging extremity of said frame to swing horizontally relative thereto about an axis parallel with the frame axis, a cutter support pivotally mounted on the outer extremity of said rst support to swing relative thereto about an axis parallel with the support axis, a kerf cutter pivotally mounted on said second support to swing relative theretoabout an axis at right angles to a 1in@ parallel to a une parauei to the axis of said second support, and motor operated devices kfor swinging said frame relative to the base, for swinging said first support relative to said frame, for swinging said second support relative to said rst support and for swinging said kerf cutter relative to said second support, said first support being swingable relative` to said frame while the latter remains stationary and said second support being swingable relative to said iirst supportwhile said first support remains stationary.

48. In a mining apparatus, a portable base, a frame overlying said base and swingable hori- Zontally relative thereto about a vertical axis, said frame overhanging the forward end of said base, a support pivotally mounted o n the outer overhanging extremity of said frame to swing horizontally relative thereto about an axis parallel with the frame axis, a` cutter support pivotally mounted on the outer extremity of said rst support to swing relative thereto about an axis parallel with the support axis, a kerf cutter pivotally mounted on said second support to swing relative thereto about an axis at right angles to a line parallel-to a line parallel to the axis of said second support, and motor operated devices for swinging said frame relative to the base, for swinging said Iirst support relative to said frame, for swinging said second support relative to said first support and for swinging said kerf cutter relative to said second support, said first support being swingable relative to said frame while the latter remains stationary and said second. support being swingable relative to said iirst support while said first supportremains stationary, said motor operated devices including a motor mounted on 'said swingable frame.

49. In amining apparatus, aportable base, a frame structure mounted on said base 'to swing liorizontallyrelative thereto, a support mounted on said iramestructure for rotation relative thereto about a horizontal axis, an arm structure pivotally mounted on said rotatable support to swing relative thereto, a cutter support pivotally mounted on said arm structure, a kerf cutter pivotally mounted onV said cutter support, and a 4motor relative to which said arm structure is swingable for swingingsaid arm structure, for swinging said cutter support relative to said arm structure and for swinging said kerf cutter, said cutter support being swingable relative to said arm structure-while the latter remains stationary as regardsv swinging movement about its own axls.y n i 50..In a mining apparatus, a portable base, a frame structure mounted on said base to swing horizontally relative thereto, a support mounted on said Yframe structure for rotation relative thereto about afhorizontal axis,V an arm struc- 4ture'pivotally, mounted on said rotatable support to swing `relative thereto, a cutter support pivotallymounted on said arm structure, a lier-f cutter pivotally mounted on said cutter support, and a motor mounted on said swingable frame structure and relative to which said arm structure is swingable for swinging said arm structure, for swinging said cutter supportrelative to said arm structure while-the latteris stationary and for swinging said kerf cutter; 1 i

5l.` In a mining apparatus, a portable base. a frame structure mounted on said base to swing horizontally. relative thereto, a support mounted on saidV frame structure for rotation relative thereto about. a horizontal axis, an arm structure pivotally mounted on said rotatable support to swing relativethereto, a cutter support pivotally mounted on `said arm structure, a kerf cutter pivotally `mounted on said cutterfsupport, and a Inotor relative to which `said arm structure is swingable for swinging said frame structure relative. to said base, for swinging said cutter support relative to said arm structure` and for swinging saidkerf cutter, said cutter support being swingable relative to` said arm structure while the latter remains `stationary as regards swinging movement about its own axis.

52. In a mining apparatus, a portable base, a `frame structure mounted on said base to swing horizontally relative thereto, a support mounted on said frame structure for rotation relative thereto about a horizontal axis, an arm structure pivotally mounted `on said rotatable support to swing relative thereto, acutter support pivotally mounted Von said arm structure, a kerf cutter pivotally mounted on said cutter support, and a motor mounted on said swingable frame structure and relative to which said `arm ,structure is swingable for swinging said frame structure relative to'said base, for swinging said cutter support relative to said arm structure independently of movement of the latter and for swinging said kerf cutter.

53. In aV mining apparatus, a portable base, a frame structure mounted on said base and extending forwardly in advance of said base, and a kerf cutter support pivotally mounted on the Cgi outer extremity of said frame structure, said frame structure including articulated supporting elements swingable simultaneously about a common axis to move the cutter support through a relatively wide range of adjustment and one supporting element swingable relative to the other about a different axis to move the cutter support through a relatively restricted range of adjustment, and devices for swinging said cutter support relative to said frame structure to maintain the kerf cutter in parallel cutting positions during either adjustment of said framestructure.

54. In a mining apparatus, a portable base, a frame structure mounted on said base and extending forwardly in advance of said base, and a kerf cutter support pivotally mounted on the outer extremity of said frame structure, said frame structure including articulated supporting elements swingable simultaneously about a common axis to move the cutter support through a relatively wide range of adjustment and one supporting element swingable relative to the other about a diierent axis to move the cutter support through a relatively restricted range of adjustment, and devices for swinging said cutter support relative to said frame structure to maintain the kerf cutter in parallel cutting positions during either adjustment of said frame structure, one of said supporting elements pivotally connected to the other about a horizontal axis whereby one supporting element may be swung relative to the other to move the cutter support into horizontal and vertical cutting positions.

55, In a mining apparatus, a portable base, a horizontal turntable on said base, a kerf cutter, and an adjustable supporting structure adjustable about a radial horizontal axis relative to said turntable and intervening said turntable and kerf cutter, said supporting structure including but a single arm hinged to said turntable at the forward end of said base to swing about an axis at right angles to a line extending radially from the turntable axis and on which the kerf cutter is pivotally mounted, said arm constituting the sole supporting connection between the kerf cutter and said turntable, and mechanism for adjusting said supporting structure to position said kerf cutter into parallel planes, said adjusting mechanism including means for swinging said arm about its pivot to move said kerf cutter into aforesaid parallel planes.

56. In a mining apparatus, a portable base, a horizontal turntable on said base, a kerf cutter, and an adjustable supporting structure adjustable about a radial horizontal axis relative to said turntable and intervening said turntable and kerf cutter, said supporting structure including but a single arm hinged to said turntable at the forward end of said base to swing about an axis at right angles to a line extending radially from the turntable axis and on which the kerf cutter is pivotally mounted, said arm constituting the sole supporting connection between the kerf cutter and said turntable, and mechanism for adjusting said supporting structure to position said kerf cutter into parallel planes adjacent the mine door and parallel planes a substantial distance above the top of said turntable, said adjusting mechanism including means for swinging said arm about its pivot to move said kerf cutter into aforesaid parallel planes.

57. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto about an axis transverse to a line extending radially from the turntable axis, a cutter support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, a horizontal kerf cutter mounted on said cutter support, said cutter sup port swingable about its pivot relative to said arm to move said keri cutter into relatively inclined cutting planes, means for swinging said arm relative to said turntable and said cutter support relative to said arm to move said kerf cutter into parallel horizontal planes including horizontal planes above and below said turntable while the lierf cutter at all times remain in a horizontal cutting position, and means for adjusting said arm relative to said turntable to move said kerf cutter in a vertical cutting position,

58. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto about an axis transverse to a line extending radially from the turntable axis, a cutter support pivotally mounted on the outer extremity of said arm to swing rela tive thereto about an axis parallel with the arm .pivot axis, a horizontal lierf cutter mounted on said cutter support, said cutter support swingable about its pivot relative to said arm to move said kerf cutter into relatively inclined cutting planes, means for swinging said arm relative to said turntable and cutter support relative to said arm to move said kerf cutter into parallel horizontal planes including horizontal planes adjacent the mine floor and horizontal planes a substantial distance above the top of said turntable while the kerf cutter at all times remains in a horizontal cutting position, and means for ad justing said arm relative to said turntable to move said kerf cutter into a vertical cutting position.

59. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said base to swing in a vertical direction relative thereto about an axis transverse to a line extending radially from the turntable axis, said arm extending longitudinally of the base a substantial distance in advance of the base, a cutter support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, said cutter support being swingable through at least 96 relative to said arm, a kerf cutter mounted on said cutter support, said cutter support swingable about its pivot relative to said arm to move said kerl cutter into relatively inclined cutting planes, means for swinging said arm and support about their respective axes, and means for adjusting said arm relative to said turntable to move said kerf cutter into a vertical cutting position.

60. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said base to swing in a vertical direction relative thereto about an axis transverse to a line extending radially from the turntable axis, said arm extending longitudinally of the base a substantial distance in advance of the base, a cutter support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, said cutter support being swingable through substantially 180 relative to said arm, a kerf cutter mounted on said cutter support, said cutter support swingable about its pivot

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