US2007904A - Mining machine - Google Patents

Description

my 9 1 A. c. WlLcox ,@WQM

` MINING MACHINE Filed sept 17, 1951 8 Sheng-sheet 1 ulggmglmlcenmls' Wuy 9, H935., A. c. WlLcox UW@ MINING MACHINE Filed Sept. 17,1931 8 Sl'leess--Sl'leecl 2 .|I l l Il 1 muy 1935; A, WILCQX www@ MINING MACHINE Filed Sept. 17, 1931 8 Sheets-Sheet 5 Wullly 9,- i935.-

.' C. WILCOX MINING MACHINE Filed Sept. 17, 1931 8 SheetsfSheet 4 Juy 9, 1935..

A. C. WlLCOX MINING MACHINE 8 Sheets-Sheet 6 Filed Sept. 17, 1931 July 1935. A, C, WILCOX 00mm MINING MACHINE Filed Sept. 17, 1951 8 Sheets-Sheet 7 @eww/0%@ M5612@ 6T @Mmm @@Awa# W@ wy.

A. C. WILCOX MINING MACHINE Filed Sept. 17, 1951 July 9, 1935.,

8 Sheets-Sheet 8 frame or body l, through improved adjustable supporting means 5, is a rotatable cutter head 5 having pivotally mounted thereon a kerf cutting element The frame or body l consists of a base portion 'l having a rearward upstanding portion or standard 8 from which there projects a horizontal arm-like portion e, the latter extending forwardly from the standard 3 and overlying the base portion l in the manner shown. Pivotally mounted at lil on the forward extremity of the arm-like portion s is a block member il. This block member is provided with a cylindrical projection l2 forming a journal, and is retained in position within a bore i3 formed in the arm, by means of a retaining nut i4 threadedly connected to the projection l2. As shown, pivotally con nected to the block member i i at l5, l5 are spaced parallel arms l, EE, in turn pivotally connected at il, il to and supporting a plate I8. Also pivotally connected to this plate member about axes coincident with the axes of the arms I6, I are spaced parallel arms i9, i e, in turn pivotally conu nected at 2B, 23 to a frame member 2l. The two pairs of arms i6, l@ and i9, i9 in conjunction with the block l l plate i8 and frame member 2l, consttute a double parallelogram structure by which the frame member 2l with its attached parts is mounted on the arm-like portion d of the machine body. As shown in Fig. l1, the frame member 2i is provided with a cylindrical bearing portion 22, herein in the form of a neck, on which the cutter head Si is rotatably mounted. From the foregoing it will be evident that the parallel frame structure maintains the axis of the cutter head always parallel to a common straight line during swinging of the arm structure transversely across the machine; and to permit the axis of the cutter head to be disposed angularly with respect to said common straight line, there is provided means for rotating the block member to change the spacial relation of the arms as shown in Fig. 13.. The rotating means for this block member comprises a worm wheel 23 keyed at 2G to the block member and with which meshes a worm 25. The worm 25 is fixed to a horizontal shaft 2@ arranged transversely of and suitably journaled within bearing brackets 2l, attached to the arm-like portion S of the machine frame. Suitably fixed to the shaft 2S is a hand wheel 28. As the hand wheel 28 is rotated, the block member E l is rotated through the worm gearing, and this rotative movement of the block member is transmitted through the parallel arms i6, i5 to the plate I8 and the parallel arms i9, i9 to the frame member 2l, causing the latter to be tilted laterally in one direction or the other to change the angular position of the cutter head axis. The worm gearing 2e, 25 is of the self-locking type and maintains automatically the parts in their adjusted position.

Now referring to the improved motor operated devices for actuating the cutting element, it will be noted that arranged within the rearward portion of the machine frame is a motor 3b, herein preferably of the reversible electric type having its power shaft 3l horizontally disposed and extending longitudinally of the machine. Fixed to the forward end of the motor power shaft is a worm 32 meshing with a worm wheel 33, in turn fixed to a horizontal shaft Sli. The shaft 34 is arranged transversely of the machine frame and is suitably journaled therein and has fixed thereto at one end thereof a chain sprocket 35 which drives, through an endless chain connection 35, a sprocket 3l fixed to a horizontal shaft 38,

herein arranged parallel with and above the shaft 3d. As shown in Fig. '7, splined to the shaft 38 are bevel gears 39, 48, and these gears are adapted to mesh with a bevel gear di to effect rotation of the latter selectively in either of opposite directions. The mechanism for shifting the bevel gears 39, lll alternatively into meshing engagement with the bevel gear lll, comprises shipper yokes ft2, 43 suitably fixed to a horizontal actuating shaft M slidably mounted within the machine frame and provided with a pivoted operating lever 15. As shown in Fig. 5, the bevel gear "il is suitably fixed to the rear end of a longitudinally extending shaft 4t, and xed to the forward end of this shaft is a bevel gear 4l constantly meshing with a bevel gear 48, in turn suitably fixed to a vertical shaft 59. The shaft 49 is arranged with its axis coincident with the axis of rotation of the lock member l i and is suitably journaled within this block member in the manner shown. Suitabiy fixed to and driven by the shaft 49 is a bevel gear 5t constantly meshing with a bevel gear 5l suitably xed to a horizontal shaft 52, the latter being arranged with its axis parallel with and midway between the arms I6, IG, as shown in Fig. ll. The shaft 52 is journaled at its opposite ends with bearing brackets or blocks 53, 54, the bearing bracket 53 being rotatably mounted on the shaft 9, while the bearing bracket tiliis rotatably mounted on a vertical shaft 55 carried by the plate member i Suitably secured to and driven by the shaft 52 is a bevel gear constantly shaft 55. Also fixed to and driven by the shaft i5 is a bevel gear 53 constantly meshing with a '-uf bevel gear 59 suitably fixed to a horizontal shaft d, herein arranged parallel with and midway between the arms i9, lil. The shaft El) journaled within a bearing bracket or block 6i rotatably mounted on the shaft 55 and a bearing bracket or block F32 rotatably mounted on a vertical shaft 63 journaled within the frame member 2 l. Suitably xed to and driven by the shaft 6G is a bevel gear "54 constantly meshing with a bevel gear 55 suitably fixed to the shaft @3, and this bevel gear constantly meshes with and drives a bevel gear 65 suitably nxed to a horizontal shaft 5l extending through the neck along the axis of the cutter head. Suitably fixed to and driven by the shaft 61 is a bevel gear E8 constantly meshing with a bevel gear 69 suitably fixed to a shaft lf3 arranged with its axis coincident with the pivot axis and constituting the driving shaft for the cutting element. Secured to and driven by the shaft 'i5 is a chain sprocket 'l i, which er "es and drives in a well known manner an endless cutter bit carrying cutter chain 'I2 mounted for circulation about the margin of an elongated plane cutter bar 'f3 of a usual design. It will thus be seen that due to the arrangement of the transmission shafts 52, E@ and the several driving gears, the cutter chain 'f3 may be driven irrespective of the position of the arm structure relative to the machine frame, it being possible to swing the cutting mechanism from one side of the machine to the other while the cutter chain is continuously driven.

The means for pivotally mounting the cutter bar on the cutter head and the means for swinging the cutter bar and rotating the cutter head, will now be described. The cutter bar 'I3 is provided with a cylindrical projection 'ill having a radial flange l5 mounted within` a circular gui den way formed by an annular plate 'r6 suitably rig idly secured to the cutter head frame. Fixed to Ajournaled within the machine frame.

'th-eicylindricalfprojectionfld is a worm wheel 'I1 with whichineshes a worm 'liisuitably'ixed to a transverse shaft lt. Secured to the shaft T9 is a handiwheel 3&3.. Itwill therefore be evident that when the hand wheel 313 is turned the cylindrical projection lli is rotated through the worm gearing ll, it, thereby swinging the cutter bar 'i3 about its axis relative to the cutter head. -The worm gearingl il', i8 is of theLself-locking type and maintains automatically the cutter bar in its different positions of adjustment. The cutter head "rotating means comprises a worm gear segment 3l `secured to the 'cutter head frame and with the teeth of which meshes a worm t2 secured to a `hr'srizontal shaftA 83.' The shaft B3 is arranged transversely of the cutter head frame and is `suitably journaled within bearing brackets 84 secured tothe framemember Zi. Fixed to one end of treshaftti` is a hand wheel 85. As this hand wheelis rotated, the cutter head 5 is turned about its'axis through the Worm gearing 8i, 82 to position the cutter. bar in the horizontal cutposition, as indicated in full lines in Fig. l2, or in its opposite shearing positions, at opposite sides of the vhead axis, as indicated in dotted lines in that ngure.. Due to the fact that the neck portion of` the frame member E l `is concentric with `the shaft 'iit follows that the driving connection through the shafts and gears aforementioned to the chain sprocket 'H will be maintained irrespective ofrotation of the cutter head about the neck axis. Likewise, due to the cutter bar being fswingable about the'axis of theshaft l0, it follows thattheidriving connection to the chain sprocket will also be maintained irrespective of any angu- `larpnsition to which` the .cutter bar may. be moved fwith respect to the cutter head.l

Now referring to the mechanism for moving the machine as an entirety along the mine trackway,

it wilibeobserved that splined to the shaft 3d at vone side of worm wheel'id is a pair of reverse bevels 86, 3i, While splined to this shaft at'the opposite side of `the worm wheel is a pair of reverse bevels 88, 8S. The bevel's'i, 8l are movable into alternative meshing engagement with a bevel gear 9d fixed to a vertical shaft QI suitably The bevels S8, SQ are movable into alternative meshing engagement with a bevel gear 92 fixed to a vertical shaft @3er-ranged paralleliwith the shaft Si and `likewise suitably jonrnaled in the machine frame.

Fixed Ato the shafts ti and ehirespectively, are rope winding drums 9d and 95 having wound thereupon feed cables` 95 and 91. The free ends of these cables are providedwith `hooks dii-normally engageable within openings formed in the upper drum flanges, as shown in Fig. 7, whereby said drums with the cables wound thereon may be rotated. without tendency of the cables to unwind from the' drums. `The sides of the machine frameare providedl withopenings ed, 99 through which the free ends ofthe feed cables may be extended in` the manner to` be later described. `Jcurnaled adjacent the openings S9 are guide rolls me, IBD around which the feed cables are adapted topass. of the shaft 9i, isa bevel gear itil with which is adapted to'mesh a'bevel-gear |932 splined` to a transverse shaft itil. Keyed to the shaft I @5 is a -chain sprocket Hl which drives, through an endless chain connection Mld', asprocket |66 fixed to the-rear truckwheel axle im.' vThe mechanism for shifting the reverse bevels tt, 81 and S8, 89 into meshing engagement with their respective bevel `gearsldt and 92, comprises shipper yokes 108, |09

standing rod As shown in Fig. 7, fixed to the lower end engaging annular grooves .in the hubs of the gears and-rigidly fixed to attransverse actuating rod I i@ suitably guided within the machine frame. The-rod Nilis provided with a screw threaded `portion l I I with which threadedly engages a rotatable nut H2 rotatably mounted at H3 on the frame of the machine. Secured to the nut i E2 is a hand wheel l Mi. t willthus be seen that as one 'or the other of the hand wheels is rotated the `rod.` HG is moved axially in one direction or the Aother to effect the meshing engagement of one or ing engagement and one or the other of the bevel gears 86, 8T! is in meshing engagement with the bevel gear 9B, the truck wheels may be driven in one direction or the other to propel the machine bodily along the mine Vtrackway. It will also be noted that the feed cables on the winding drums S, 95 under certain conditions may be extended in a suitable manner forwardly and rearwardly along the opposite sides of the machine and connected at their free ends to' suitable anchors, and

as the drums are rotated in the proper direction the feed cables `maybe. wound in to; move the apparatus bodilyalong the mine trackway in the 'desired direction Wholly independently of the v truck wheel drive. n i i .Y

Thevarious parts Vsupported by the parallel motion structure, including the rotatable cutter head and pivoted cutter bar, are relatively heavy, 'and as the arms suspended from the armlike portion il of the machine frame are incapable in themselves of` supporting said parts against `sagging `movement, there is secured at E28 to the framemember 2i the lower end of an uprigidly to the top of the arm-like portion 9 of the machine frame, as shown in Fig. l. The arm ft2? and rod iti cooperate to form `an auxiliary or supplemental support for the supporting structure Ll, andas this supporting structure is swung laterally the arm i2?. swings about its fpivotlfl on the truck while the latter traversesthe tracks l2?, to permit the supporting 'structure to be shifted while it is supported by the arm 122. The hand wheel E23 provides means for vertically adjusting the frame memlberi to eliminate possible binding of the parts connecting this framernember to the arm-like portion 9 of the machine frame.

4In the present construction, pivotally connected at i351 at one end to the forward end `ofV the machine frame, at one side thereof, is `an elongated guide arm l3l carrying on its free .endagnide roll i152, while similarly pivoted at `the other side of the machine frame is an identi- :cal arm' 33 carrying at its free end a guide roll ist a positionl parallel to the machine frame against the side thereof, asshown in full lines in Figs. 1

Each of these arms is swingable between lili, which rod extends -loosely l' Vthrough the free end of a horizontal arm V22 Vandliras?threaded thereon a hand wheel 623. The `arm it? is pivotally connected at R24 to a truck i E25, which is provided with Wheels |26. These truck wheels run-in a suitable manner bevtween upper and lower tracks if? suitably secured and 4, to a position at, 0r substantially at, right angles to the machine frame, as shown in dotted lines in Fig. l and in full lines in Figs. 11, 13 and lll. Each of these arms, furthermore, has pivoted thereto a brace |35, which may be extended at an angle to its related arm and suitably engaged at its free end with the machine frame to hold its arm in extended position with respect to the machine frame. Each of the arms I9, I9 of the parallel motion structure is provided adjacent the frame member 2| with an eye |39 to which the hooks 98 on the feed cables are respectively connectible, for a purpose hereinafter described.

The general mode of operation of the improved coal mining machine will now be described. The mining machine may be propelled along the mine trackway either forwardly or rearwardly by means of the motor 3|! geared to the truck wheels, or by the cable winding drums 94, 95, as conditions may determine under the control of the reverse bevels 86, 81 and 88, 89, and the sliding gear |92. When the machine is suitably positioned adjacent the coal face and it is desired to undercut the wall of the coal, the operation is as follows: The hook 98 is detached from the drum flange and the feed cable 91 is extended from the drum 95, laterally through the opening 99, around the guide roll |99, around the guide roll |32 carried by the guide arm |3|, the latter being disposed in its right angle position with respect to the machine body at that time; and the free end of this cable is connected by the hook 98 to the eye |36 formed on the adjacent arm I9 of the parallel motion support structure. The feed cable 91 is then slowly wound in, and as a result the support structure, together with the parts carried thereby, is swung laterally to a position adjacent the right hand rib, as indicated at A in Fig. Ll. Next the lever is manipulated to move the gear 39 into meshing engagement with the gear 4|, which, through the gearing previously described, effects actuation of the cutter chain 12 about the margin of the cutter bar 13. Then by manipulating the lever ||8 the truck wheels are connected in driving relation with the motor 39, and as a result, the machine is fed as an entirety along the mine trackway to cause the cutter bar to penetrate the wall of the coal. When the cutter bar has penetrated the coal to the desired depth, movement of the machine along the trackway is discontinued, and the other guide arm |33 is swung outwardly to its right angle position with respect to the machine body, and the hook 98 is detached from the drum flange and the cable 91 is passed laterally through opening 99, around guide roll |09, and around guide roll |34 on the free end of the guide arm |33, and the hook 93 on the free end of the cable is engaged in the eye |39 on the adjacent arm I9 of the parallel motion support structure. The drum 94 is then suitably connected in driving relation with the motor to c-ause the cable 96 to be wound slowly onto the drum 94, thereby causing the arm structure, together with the parts connected therewith, to move the cutter head, and consequently the cutter bar laterally with respect to the machine, resulting in the cutting of a kerf of substantially uniform depth across the coal face by a single continuous operation, the cutter bar being moved from the position A indicated in Fig. 4 to the position B shown in that figure. During this operation and other operations during horizontal cutting, the cutter bar may be swung about its pivot relative to the arm structure simply by turning the hand wheel 80 of the cutter swinging mechanism.

Under certain conditions, the cutter bar 13 when in the central position indicated at C in Fig. 4 may be sumped in an endwise direction into the coal, and when the coal is penetrated to the desired depth, the feed cable 91 may be connected to the parallel motion arm structure and the cutter bar moved from left to right from the position C at the center of the entry to the position indicated at A in Fig. 4 adjacent the right hand rib of the entry. Thereafter, the other feed cable 9S is connected to the adjacent arm |9 of the support structure, and the cutter bar is moved from right to left, from the posi tion indicated at A in Fig. 4 to the position in dicated at B, thereby to complete the horizontal cut. After the completion of the horizontal cut the cables are rewound on their respective drums, the hooks 99 attached to the drum flanges, and the guide arms are folded against the sides of the machine body.

When it is desired to make a shearing or vertical cut in the coal face, the operator turns the hand wheel 85 to move the cutter bar through an arc of a circle from the full line position shown in Fig. l2 to one or the other of the dotted line positions indicated in that figure. The operator then turns the hand wheel 89, thereby swinging the cutter bar to the position indicated at D in Fig. 1. The machine is, then fed bodily along the mine trackway until the cutterbar assumes a position closely adjacent the face of the coal, and thereafter the cutter bar is swung downwardly in its plane by suitable manipulation of the hand wheel 89 to effect its shearing cut. Under certain conditions, the cutter bar when disposed in its vertical or shearing position may be swung upwardly to the position indicated at E in Fig. 1, and thereafter the machine may be fed bodily along the mine trackway to cause the cutter bar to penetrate the wall of coal. After completion of the sumping cut, the cutter bar may be swung downwardly in its plane and thereafter the machine may be fed bodily rearwardly to withdraw the cutter bar from the coal. As the machine herein described operates to cut kerfs in both vertical and horizontal planes in accordance with the standard arc wall practice, further description of the mode of operation of the machine is unnecessary. These and various other methods of use of the improved mining machine will be clearly apparent to those skilled in the art.

As a result of this invention it will be noted that an improved coal mining machine is provided of the combined horizontal and shear cutter type, whereby both horizontal and vertical kerfs may be cut in the coal face and whereby a horizontal cut of substantially uniform depth may be made completely across the face of the coal. It will further be noted that by the provision of the improved adjustable parallel motion support structure for the cutter head it is possible to insert vertical or shear cuts at either rib of the entry or at any point intermediate the ribs. Further, by the provision of the improved adjustable supporting structure for the cutting mechanism, it is possible to move the cutter bar through a comparatively wide range, thereby enabling the machine to accommodate itself to entries of various widths.

While I have in this application specifically described one form which my invention may assume in practice, it Will be understood that this form isis-hewn for purposes of illustration only, and that the invention may be embodied in various other forms Without departing from its spirit or the scope of the appended claims.

What I Letters Patent is:

1. In `a mining machine', a `portable base, an adjustable supporting arm structure mounted on said base to' swing horizontally relative thereto and comprising spaced parallel horizontally dis: posed arms pivotally connected to the Vbase to swing about parallel vertical and a kerl cutting mechanism mounted on tlficouter extremity of and wholly supported by saidar'rn structure and including a kerf cutter adjustable bodily relative to the arm structure into different cutting positions, said arms arranged in parallel relation and pivotally connected to the cutting mechanism about parallel vertical axes, the axes at the op` posite ends oi said arms being spaced at equal distances apart and said arms always maintaining the kerf cutter, in any of aforesaid cutting positions, parallel to a line extending longitudinally of the machine during swinging of the arms horizontally from one side of said base to the other.

2l. In a mining machine, a portable base,- a supporting arm structure pivotally mounted on said base to swing horizontally relative thereto and comprising spaced parallel horizontally disposed arms pivotallly connected to the base to swing about parallel vertical aX'es, and kerf Vcutting mechanism mounted on the outer extremity ci and wholly supported by said arm structure and including a rotatable cutter head and a keri cutter pivotally mounted on said cutter head, said kerl cutter adjustable with said head into' diierent cutting positions about the head axis, said arms arranged'in parallelrelation and piv-v otally connected to thercutting mechanism about parallel vertical axes, the axes at the opposite ends oi` said arms being `spaced at equal` distances apart and said arms always maintaining the cutter head axis parallel to aline extending longitudinally of the apparatus in any oi aforesaid cutting positions of the kerl cutter and during swinging of said arm structure horizontally from one` side` of said base to the other. Y

3. In a mining machine, av portable base, an arm structure pivotally mounted on said base to swing 4horizontally relative thereto, a cutter head rotatably mounted on tli'e outer extremity of said arm structure, anda keri cutter pivotally mounted on said cutter head and adjustable with said cutter head relative tosaid arm structure into horizontal and, vertical cutting positions, said arm structure always maintaining said kerl cutter parallel to a longitudinally extending plane during swinging otsaid arm structure.

ingl machinaa portable base, aparallel link st` uctui-epivotally mounted on saidbase to swing horizontally about parallel vertical axes relative thereto, and kerl?A cutting mechanism mounted on the outer extremity of said link structure and adju 'able relative thereto into horizontal ve. alcutting positions.

Y 5. In a mini-ng machine,y a portable base,- a parallel link supportingfstructure pivotally rnunted on saidbaseA to' swing horizontally relz-itiveA thereto and comprising spaced parallel horizontally disposed `links pivotally .connected to' the base to swing aboutv parallel vertical axes, a frame c'arried at the' outer extremity of and Wholly sup'- ported by' said link structure; `and" kerl cutting claim as new and desire to secure by:

mechanism mounted on said frame and including a cutter head rotatably mounted on said frame and a kerf cutter pivotally mounted on said cutter head and adjustable with said head aboutthehead axis into diierent cutting'positions, said links arranged in parallel relation and pivotally connectedto said frame about parallel vertical axes, the axes at the opposite ends of said links being spaced at equal distances apart.

6. In a mining machine, a` portable base, a parallel link structure pivotally mounted on` said base to swing horizontally about parallel Vvertical ases relative thereto, a frame carried at the outer extremity of said link structure, a cutter head rotatably mounted onsaid frame, and a kerf cutter pivotally mounted on said cutter head and adjustable with said cutter head relative to said links into horizontal and verticalcutting' positions.

7. In a miningmachine, a portable base, an arm structure pivotally'mounte'd on said base to swingrelative thereto, keri cutting mechanism mounted ori the outer' extremity o said arm structure and adjustable` relative thereto into horizontal and vertical cutting positions,- and means supplemental to said arm structure for supporting said cutting mechanism during swinging ofsaid structure relative to said base.

S. In a mining machine, a` portable base, a parallel link structure pivotally mounted on said and comprising pairs of parallel links, and keri cutting mechanism mounted on the outer extremity of said link structure and adjustable relative thereto in'to horizontal andvertical cutting positions.

tljln a mining machine,V a portable base, a

parallel link structure pivctally mounted on said and comprising pairs ci parallel links, a`

cutter head rotatably mounted on the outer extremity of said link structure, and a kerl cutter pirotally mounted on said cutter head and adjustable with said cutter head relative to said link structure into horizontal and vertical cutting positions. Y

10. In a mining machine, a portable base, kerf cutting ,mechanism on said base including an elongated kerf cutter, and adjustable. supporting means for said kerf cutter swingable horizontally Arelative to said base for movingr said kerf cutter during such horizontal swinging movement laterally in a substantially straight path while said cutter remainsall the time parallelgto longitudinally extending vertical plane to cut a horizontal {3i-substantially uniform depth in the coal race,l said supporting means including meansufor positioning said kerf cutter in a horizontal cutting position and for positioning said korf cutter in a: `position to' cut an angularly disposed kerf.

il. In a mining machine', a portable base, kerl cutting mechanism on said base including an elongated kerl cutter, andadjustable supporting meiosis forV said kerl cutter swingable horizontally relative to said base for moving said korf cutter during such horizontal swinging movement laterally in a substantially straight path while said cutter remains all the time parallel to a longitudinally extending vertical plane to cut a horizonta'l-kerf of substantially uniform depth in the coal iac'e, said supportingv means including means for positioning said kerf cutter in a ,horizontal cutting position Vand for positioning said kerf cutter inra position to cut a vertical korf.

j l2. In a mining machine, al portable base, kerl cutting mechanism thereon including an elongated keri cutter, adjustable supporting means for said k'erf cutter for positioning saidkerf;` cutter to cut in a horizontal plane or in a vertical plane,`

and mechanism mounted on said base to swing horizontally relative thereto for moving said kerf cutter during such horizontal swinging movement in its horizontal plane laterally in a substantially straight path while said kerf cutter remains at all times parallel to a longitudinally extending vertical plane to cut a kerf of a uniform depth across the coal face.

13. In a mining machine, a portable base, kerf cutting mechanism thereon including an elongated pivoted kerf cutter mounted for swinging movement relative to said base, adjustable supporting means for said kerf cutter for positioning said kerf cutter to operate in angularly disposed planes, mechanism mounted on said base to swing horizontally relative thereto for moving said kerf cutter during such horizontal swinging movement in one of its planes laterally in a substantially straight path while said kerf cutter at all times remains stationary as regards pivotal movement to cut a kerf of a substantially uniform depth across the coal face, and means for swinging said kerf cutter about its pivot in its angularly disposed plane.

14. In a mining machine, a portable base, a kerf cutting mechanism thereon including an elongated pivoted kerf cutter swingable relative to said base, adjustable supporting means for said kerf cutter including means for positioning said kerf cutter to cut a kerf in a horizontal plane or in a vertical plane, mechanism mounted on said base to swing horizontally relative thereto for moving said kerf cutter during such horizontal swinging movement in its horizontal plane laterally in a substantially straight path while said keri cutter at all times remains stationary as regards pivotal movement to cut a kerf of a substantially uniform depth across the coal face, and mechanism for swinging said kerf cutter about its pivot to cut a vertical kerf.

15. In a mining machine, a portable base, kerf cutting mechanism thereon including an elongated kerf cutter, adjustable supporting means for said keri cutter on which said kerf cutter is pivotally mounted for swinging movement relative thereto, means mounted on said base to swing horizontally relative thereto for moving said ker cutter during such horizontal swinging movement laterally in a substantially straight path while said kerf cuttei` at all times extends parallel toa longitudinally extending vertical plane to cut a ker of a substantially uniform depth across the coal face, and means for independently swinging said cutter bar about its pivot to make an arcuate cut.

16. In a mining machine, a portable base, kerf cutting mechanism thereon including an elongated kerf cutter, a motor on said base, adjustable supporting means for said kerf cutter mounted o-n said base for horizontal swinging movement relative thereto including means for adjusting said kerf cutter into a position to cut a horizontal kerf and for moving said kerf cutter during horizontal swinging movement of said supporting means laterally in a substantially straight path while the major axis of said kerf cutter always remains perpendicular to the coal face to cut a horizontal kerf of a substantially uniform depth across the coal face and for positioning said kerf cutter to cut a vertical kerf, and driving connections between said motor and said kerf cutter.

1'7. In a mining machine, a portable base, kerf cutting mechanism adjustably mounted thereon including an elongated kerf cutter, mechanism on said base for adjusting said kerf cutter into horizontal and vertical positions, and mechanism mounted on said base for horizontal swinging movement relative thereto for moving said kerl cutter during such horizontal swinging movement in one of its positions laterally in a substantially straight path while said kerf cutter always remains parallel to a longitudinally extending vertical plane to cut a substantially straight face kerf of a substantially uniform depth across the coal face.

18. In a mining apparatus, a portable base, an adjustable supporting structure comprising parallel links pivotally connected to said base to swing horizontally relative thereto about parallel vertical axes, a frame supported by said links, said links pivotally connected to said frame about parallel vertical axes and the axes at the opposite ends of said links being spaced at equal distances apart, a cutter head mounted on said frame for rotation relative thereto about a horizontal axis, a kerf cutter pivotally mounted on said cutter head and adjustable with said head about the head axis into different cutting positions, and devices for rotating said cutter head about its axis relative tosaid frame.

19. In a mining apparatus, a portable base, parallel links pivotally connected to said base to swing horizontally relative thereto about parallel vertical axes, a frame supported by said links, a cutter head mounted on said frame for rotation relative thereto about a horizontal axis, a kerf cutter pivotally mounted on said cutter head, and devices for swinging said kerf cutter about its pivot relative to said cutter head.

20. In a mining apparatus, a portable base, parallel links pivotally connected to said base to swing horizontally relative thereto about parallel vertical axes, a frame supported by said links, a cutter head mounted on said frame for rotation relative thereto abouta horizontal axis, a kerf cutter pivotally mounted on said cutter head, devices for rotating said cutter head about its axis relative to said frame, and devices for swinging said kerf cutter about its pivot relative to said cutter head.

21. In a mining apparatus, a portable base, a kerf cutter adjustable into horizontal and vertical cutting positions, an adjustable supporting structure plurally articulated to said base on parallel pivots and supporting said ker cutter when the latter is in its vertical cutting position for adjustment into parallel vertical planes, said kerf cutter being adjustable relative to said Isupporting structure into aforesaid cutting positions, and means for adjusting said supporting structure about its plural articular connections with said base to effect aforesaid adjustment of said kerf cutter into parallel vertical planes.

22. In a mining apparatus, a portable basv a frame, a rotatable cutter head mounted on said frame for rotation relative thereto, a kerf cutter pivotally mounted on said cutter head, an adjustable supporting structure plurally articulated to said base on parallel pivots and supporting said frame for adjusting said cutter head laterally relative to said base, and means for adjusting said supporting structure about its plural articular connections with said base to eirect aforesaid adjustment o1 said cutter head into different lateral positions.

23. In a mining apparatus, a portable base, an arm structure pivotally mounted on said base to swing horizontally relative thereto, a frame supjin ported on the outerextrernity of saidarm structure and to which said arm structure is pivotally connected,`saidl frame being swingable Vrelative to said arm structure, said arm structure and trarne constituting a parallel motion device-having provision for maintaining parallelism selectively to different angularly related horizontal lines, acutter head mounted on said frame'for rotation relative thereto about a horizontalaxis extending longitudinally of the apparatus when `said arm structure is in midiposition between the sides of said base, a kerf cutter `pivo-tally mounted on said cutter head, and devices for rotating said cutter head about its axis and for swinging said lrerf cutterabout its pivot.

24. In Aa mining apparatus, a portable base, an arm structure pivotally mounted on said base to swing horizontally relative thereto, a frame supportedon the outer extremity of said arm structure and to which said arm structure is pivotally connected, said frame being swingable relative to said arm structure about an axis parallel with the pivotal axis of the arm structure, said armistructure and frame constituting a parallel motion device having provision for maintaining parallelism selectively to diirerentangularly related horizontal lines, a cutter head mounted Aon said frame for rotation relative thereto about a horizontal axis, a kerf cutter pivotally mounted on said cutter head, devices for rotating said cutter head aboutits axis and `for swinging said lrerf cutter about its pivot, andniotor operated devices for swinging said arm structure horizontally relative to said base.

25. In a mining apparatus,v a portablebase, an i rotating said cutter head about its axis and for swinging lreri cutter about its pivot, and niotor operated devices for swinging said arm structure horizontally rrelative to said base and inr'ling motor supported on said base and relae to which said arrnlstructure is swingable.

, in aniining` apparatus, a portable base, supporting links pivotally connected to base to swing horizontally relative thereto parallel vertical axes, a frame supported by saidlinks, said links pivotally connected to said frame about parallel vertical axes and the aries at the` opposite ends of said links Vbeing spaced at equal distances apart, a cutterhead mounted on said trarne for rotation relative thereto about a horizontal axis, and a kerf cutter pivoi-aily mounted on saidcutter head and adjustable th said headabout the head axis into diierent cutting positions, said parallel .links maintaining said cutter head axis alwaysiparallel to a common straight line during swinging of said links horizontally about their pivots.

2'?. in a mining apparatus, a portable base, a parallel motion arm structure overhanging said and pivot-ally mounted at itsrearward extremity on said base to swing ,in ahorizontal `direetion relative theretoabout parallel vertical overhang-ing extremity 'or said l arni` structure. and

adjustable rela'ive to said arm structure into horizontal and vertical cutting positions.

28. In a mining apparatus, a portable base, a parallel motion arm structure overhanging said base pivotally mounted at its rearward extremity on said Vbase to swing in a horizontal direction relative thereto about parallel vertical axes, a cutter head mounted on the outer overhanging extremity of said arm struct-ure for rotation relative thereto about a horizontal axis, and a kerl? cutter pivotally mounted on cutter head and .rotatable therewith about the head axis relative to said arm structure into horizontal and vertical cutting positions.

29.`In a mining apparatus, a portable base, parallel supporting links pivotally connected to said base for swinging movement in a horizontal direction relative thereto about parallel vertical axes, a frame supported by said links, said links pivotally connected to said frame about parallel vertical axes and the axes at the opposite ends of said linlrsbeing spaced at equal distances apart, a cutter head mounted on said frame for rotation relative theretoabout a horizontal axis, and a korf cutter pivotaliy mounted on said cutter head and adjustable with said head' about the head axis into different cutting positions.

30. ln a. mining apparatus, a portable base, a parallel motion arm structure including an'arin element pivotaliy mounted on theiorward end of said base to swing in a horizontal directionrelative thereto about a vertical 'a keri cutter mounted on the outer extremity or said arm struczontal and vertical cutting positionsa motor car ried by said base and relative toiwhieh said structure is swine'able, and devices driven by said motor for actuating said kerf cutter..

31. lin a mining apparatus, a portable base, an ai'nistructure including an arm element pivotally mounted on the forward end of said base to swing `in a horizontal direction relative thereto about a vertical axis, a keri cutter mounted on the o-uter extremity of said arrn structure and ad justable relative thereto into horizontal and ver tical cutting positions, a motor carried by said base relative to which said arm structure is swingable and whose position does not change with any change in position of said kerf cutter relative to said base, devices driven by said motor for actuating said kerf cutter, andjdevices driven by said motor for swinging said arm structure relan tive to said base.

32. In a mining apparatus, a portable base, an arm structure including an arm element pvotally mounted on the forward end of said base to swing in a horizontal direction relative thereto about a vertical axis, a cutter head mounted on the outer extremity of said arm structure for rotation relative thereto about a horizontal axis, and a kerf Vcutter pivotally mounted on said cutter head and rotatable therewith relative to said arm structure into horizontal and vertical cutting positions, said armstrueture constitu-ting mechanism for automatically maintaining the axis of said cutter head parallel to a common straight line during swinging of said arm structure.

33; In a mining apparatus, a portable hase, a supporting struc-ture mounted on said base in" cluding parallel arrns pivotally mounted on the forward end of said base for swinging movement lture and adjustable relative thereto into horirelative thereto about vertical axes, and a kerf 34. In a mining apparatus, a portable base, a supporting structure mounted on said base including spaced parallel arms pivotally mounted on the forward end of said base for swinging movement relative thereto about vertical axes, a l-:erf cutter mounted on the outer extremities of said arms for adjustment relative thereto into horizontal and vei'toal cutting positions, and devices for adjusting said armsr to vary their parallel relationship to effect adjustment of the kerf cutter angularly relative to the vertical.

35. In a mining apparatus, a portable base, an adjustable supporting structure including parallel arms pivotally mounted on the forward end of said base for swinging movement relative thereto about vertical axes, and a kerf cutter mounted on the outer extremity of said supporting structure for adjustmen-t relative thereto vinto horizontal and vertical cutting positions, said arms maintaining automatically said kerf cutter parallel t0 a common straight line during swinging of said arms about their pivots relative to said base.

36. In a mining apparatus, a portable base, an

. adjustable supporting structure including parallel arms pivotally mounted on the forward end of said base for swinging movement relative thereto about vertical axes, a cutter head mounted on the outer extremity of said supporting structure for rotation relative thereto about a horizontal axis, and a kerf cutter pivotally mounted on said cutter head and rotatable therewith relative to said supporting structure into horizontal and vertical cutting positions.

37. In a mining apparatus, a portable base, an adjustable supporting structure including parallel arms pivotally mounted on the forward end of said base for swinging movement relative thereto about vertical axes, a cutter head mounted on the outer extremity of said supporting structure for rotation relative thereto about a horizontal axis, a kerf cutter pivotally mounted on said cutter head and rotatable therewith relative to said supporting structure into horizontal and vertical cutting positions, and devices for adjusting said arms to vary their parallel relationship to effect movement of said kerf cutter angularly relative to the vertical.

38. In a mining apparatus, a portable base, an adjustable supporting structure including parallel arms pivotally mounted on the forward end of said base for swinging movement relative thereto about vertical axes, a cutter head mounted on the outer extremities ci said arms for rotation relative thereto about a horizontal axis, and a kerf cutter pivotally mounted on said cutter head and rotatable therewith relative to said supporting structure into horizontal and vertical cutting positions and said arms maintaining automatically said cutter head axis parallel to a common straight line during swinging of said arms about their pivots relative to said base.

ng appara-tus, a portable base, a rotatable cutter head, a kerf cutter pivotally mounted on said head, and an adjustable supporting structure between said base and cutter head by which the latter is supported and relative to which said head is rotatable for swinging said cutter head laterally in either direction relative to said base while the head axis always remains parallel to a horizontal line extending longitudinally of the apparatus, said supporting structure comprising spaced parallel horizontally disposed arms pivotally connected at their opposite ends to the base and head about parallel vertical axes,` the axes at the opposite 'ends of said arms being spaced at equal distances apart.

40. In a mining apparatus, a portable base, a kerf cutter, an adjustable supporting structure between said base and kerf cutter including an arm pivotally connected to said base, devices for swinging said arm about its pivot to move said kerf cutter laterally relative to said base, linkage devices for maintaining said kerf cutter at all times parallel to a common straight line during such lateral adjustment, and devices carried at the outer end of said arm for adjusting said kerf cutter into horizontal and Vertical cutting positions,

41. In a mining apparatus, a portable base, a kerf cutter, an adjustable supporting structure between said base and said kerf cutter for swinging said kerf cutter abou-t a vertical axis on said base into different lateral positions while said kerf cutter at all times automatically remains parallel to a common straight line, and devices on the outer extremity of said supporting structure for adjusting said kerf cutter into horizontal and vertical cutting positions.

42. In a mining apparatus, a portable base, a horizontal kerf cutter, and an adjustable double parallelogram supporting structure mounted on said base and carrying said kerf cutter, said kerf cutter always extending parallel to a longitudinally extending plane during adjustment of said Supporting structure.

43. In a mining machine, a portable base, an adjustable arm structure mounted on said base to swing horizontally relative thereto, kerf cutting mechanism including a kerf cutter mounted on the outer extremity of said arm structure for adjustment bodily relative thereto into horizontal and vertical cutting positions, said cutting mechanism and arm structure being adjustable relative to said base to enable the kerf cutter to cut parallel vertical kerfs parallel to the longitudinal median line of the base between the sides of said base and beyond the sides of said base, all while said kerf cutter remains in vertical cutting position, a motor on said base and relative to which said arm structure is swingable for adjusting said arm structure and kerf cutter and for actuating said kerf cutter and means for adjusting said kerf cutter relative to said arm structure.

44. In a mining machine, a portable base, an adjustable arm structure mounted on said base to swing horizontally relative thereto, kerf cutting mechanism including a cutter head rotatably mounted on the outer extremity of said arm structure and a kerf cutter mounted on said cutter head and adjustable with said head into different cutting positions completely about the head axis, said cutting mechanism and arm structure being adjustable relative to said base to position the kerf cutter to cut parallel vertical kerfs parallel to the longitudinal median line of the base between the sides of said base and beyond the sides of said base, all while said kerf. cutter remains in vertical cutting position, a motor on said base and relative to which said arm structure is swingable for adjusting said arm structure and for actuating said kerf cutter, and means for rotating said cutter head.

45. In a mining machine, a portable base, an adjustable arm structure mounted on said base to swing horizontally relative thereto, kerf cutting mechanism including a cutter head rotatably mounted on the outer extremity of said arm structure and a kerf cutter mounted on said cutter head for adjustment bodily relative thereto into ,diierent cutting positions, said cutting Amechanism and arm structure being adjustable relative.

to `said base `to position the kerf cutterto cut parallel vertical kerfs parallel to the longitudinalmedian line of the base between the sides of said base and -beyond the sides of said base, all whilesaid kerf cutter remains in vertical cutting positionMa` motor on said base and relative to structurepagcutter head rotatably mounted on.y

20; said frame, and a kerf cutterpivotally mounted which said arm structure is swingablefor swinging said arm structure and kerf cutter` andfor actuatingJ saidkerf cutter, and means foriadjust` ing said kerf cutter relative to said arm structure. Y

46.` In `a mining machine, a portable base, a parallelmotion supportingr structure mounted on saidbase zfor adjustment horizontally relative thereto about parallel vertical axes, a frame-car-` ried at-the outerextremity of saidsupporting on said cutter head and adjustable withsaid head of the body at either side ofthe latter.

aboutthe head axis. l y l 4 47. Avcoal cutting machine comprising abody,`

a outterbar mounted on said body forpivotal movement about two separate axes oneV of which extends at all times vertically and the` other of which is Yadjustable between verticallyY and hori zontally extending positions, and means including a swinging frame mounted on said body for shiftingsaid irstmentioned axis transversely ofthe machine f to positions outside the lateral 'limits :48; A coal cutting machine comprising a body, a motor mountedon said body and having its axis of vdriving shaft `rotation permanently xed against motion V,with respect to said body, a cutterbar mounted on said body for pivotal move-A ment about two separate axes each of whichextends-at all times transversely with respect to the longitudinal axis of the machine and one of which is adjustable `between vertically and horizontally extending positions, means including a swinging framev mounted on said kbody for shifting said.

axes transversely of the machine, .said cutter bar including amovable cutting element, and a constant driving connection between said motor and saidcutting element. j f

49. A coal cutting machine comprising a body, a memberv mounted on said body forswinging adjustment bodily transversely of. the fmachine and for pivotal adjustment about a vertical axis,

in any position of adjustment thereof transversely of the machine, said Ernemb'erhaving a range of swinging `adjustment to L position said vertical axis outside the lateral .limits or the "machine body at either sideof the latter, a second member b mounted on said first memberfor pivotall adjustmentwith respect theretoabout an axis disposed at right angles to the axis of pivotal movement of said rst mentioned member, and aicutter' bar mounted on said second mentioned member for pivotal adjustment about an axis disposed `at right angles to the axis 'of the pivotal connection betweensaid members. .l 50; -A coal cutting machine comprising abody,

a member mounted on said bodyfor swinging'ad-v justment bodily transversely of the machine and for pivotal adjustment about a vertical axis in any position of adjustment thereof` transversely-.of

the machine, said `member having a range of swinging adjustment to position said vertical axis outside the lateral limitsof the machine body at either side ofthe latter, a second member mounted on said first member for'pivotal'adjustment withrespect thereto about an axis disposed at right angles to lthe ax-is ofv pivotal movement of said first mentioned meinbeiya cutter bar mounted on said `second mentioned member for pivotal adjustment about an axis disposed at right angles to the axis of the pivotal connection between said members, and means on the body for pivotally adjusting said first mentioned member.

51. A coal cutting machine comprisinga body, a member mounted on said body for swinging adjustment bodily transversely of the machineV and for pivotal adjustment abouta vertical axis in any position of adjustment thereof transversely of the machine, said member having a rangeof swingingadjustmenttopositionfsaid vertical axis outside the lateral limits of Vthe machine body at eitherside of the latter, a Vsecond member mount-` ed on said rst member for pivotal adjustment' 52. `.A coal cutting machine comprising a body,`

a member mounted on said body for swinging adjustment bodily transversely of the machine land forpivotal adjustment about a` vertical axis in any position of adjustment thereof'transversely of `the machine, saidmember having a range of swinging adjustment to position said vertical axis,

outside the lateral limits of the machine body at `either side of` the latter, a second member mounted on said first member for pivotal adjustment withrespeot thereto about an axis disposed at right angles to the axis `of pivotal movement of said rst mentioned member, a cutter bar mounted on said second mentioned member; for pivotal adjustment about an axis disposed at right angles to the `.axis of the pivotal connection betweensaid members, and means on said second mentioned member for 'pivotally adjusting said cutter bar with respect thereto.

. 53. A coal cutting machine comprising a body, a member `mounted on said body, a pair of arms pivotally connected at adjacent ends to said memberiat spaced points, respectively, a second member to which the opposite ends of said armsv are pivotally connected at spaced points, respectively, .asecond pair of arms pivotally con- 'nectedat adjacent ends to said second member on pivots coaxial with the pivotal connections of said rstpair of arms therewith, a third member to which the opposite ends of said second pair of arms are pivotally connected at spaced points, respectively, and a cutter bar carried by said thirdl member.

54. A coalcutting machine comprising a body, a member mounted onV said bodyl for rotaryadjustment'aboutv a vertical axis, a pair of arms pivotally connected at adjacent ends to said member at spaced points, lres ectively, a second member to which the opposite ends of saidparms arepivotally connected. at spaced points, rrespectively, a second pair of arms pivotally con- `nected at adjacent ends to said second member on pivots coaxial with the ypivotal connections of 'said rst pair of arms therewith, a third memberf to which the opposite ends of said second pair of arms are pivotally connected at spaced points, respectively, a cutter bar carried bylsaid third member, and means for rotatably adjust ing said iirst' mentioned member.

55. A coal cutting machine comprising a body, a member mounted on said body, a pair of arms pivotally connected at adjacent ends to said member at spaced points, respectively, a second member to which the opposite ends of said arms are pivotally connected at spaced points, respectively, whereby said second member is mounted for bodily shifting movement with respect to the body of the machine, a cutter bar connected with said second mentioned member, said first mentioned member being mounted on said body for rotary adjustment, and means for rotatably adjusting said rst mentioned member thereby to rotatably adjust said second mentioned member and said cutter bar in any bodily adjusted position of said second mentioned member and said cutter bar..

56. In a mining machine, a portable base, an adjustable supporting arm structure mounted on said base to swing horizontally relative thereto, and a kerf cutter mounted on the outer extremity of and supported by said arm structure for adjustment bodily relative thereto into parallel planes, said arm structure always automatically maintaining said kerf cutter parallel to a line extending longitudinally of the machine during swinging of said arm structure.

57. In a mining machine, a portable base, a supporting arm structure pivotally mounted on said base to swing horizontally relative thereto, a cutter head rotatably mounted on the outer extremity of and supported by said arm structure, and a kerf cutter pivotally mounted on said cutter head and adjustable with the head about the head axis into parallel planes, said arm structure always automatically maintaining the cutter head axis parallel to a line extending longitudinally of the machine during swinging of said arm structure.

58. In a mining apparatus, a portable base, a rotatable cutter head, a kerf cutter pivotally mounted on said head and adjustable with said head about the head axis into parallel planes, and an adjustable supporting structure between said base and cutter head by which the latter is supported and relative to which said head is rotatable for swinging said cutter head laterally in either direction relative to said base while the head axis automatically always remains parallel to a horizontal line extending longitudinally of the apparatus.

59. In a mining machine, a portable base, an adjustable supporting arm structure mounted on said base to swing horizontally relative thereto, and a kerf cutter mounted on the outer extremity of and supported by said arm structure and adjustable bodily relative to the arm structure into different cutting positions while the kerf cutter remains at all times parallel to a line extending longitudinally of the base, said arm structure always maintaining said kerf cutter parallel to a line extending longitudinally of the machine during swinging of said arm structure horizontally from one side of said base to the other.

60. In a mining machine, a portable base, a supporting arm structure pivotally mounted on said base to swing horizontally relative thereto, a cutter head rotatably mounted on the outer extremity of and supported by said arm structure, and a kerf cutter pivotally mounted on said cutter head and adjustable with said head about the head axis into diierent cutting positions while the kerf cutter remains at all times parallel to a line extending longitudinally of said base, said arm structure always maintaining theV cutter head axis parallel to a line extending longitudinally of the base during swinging of said arm structure horizontally from one side of said base to the other.

61. In a mining machine, a portable base, a parallel link supporting structure pivotally mounted on said base to swing horizontally relative thereto, a frame carried at the outer extremity of and supported by said link structure, a cutter head rotatably mounted on said frame, and a kerf cutter pivotally mounted on said cutter head and adjustable with said cutter head about the head axis into different cutting positions while the kerf cutter remains at all times parallel to a line extending longitudinally of said base.

62. In a mining apparatus, a portable base, an adjustable supporting structure comprising parallel links pivotally connected to said base to swing horizontally relative thereto, a frame supported by said links, a cutter head mounted on said frame for rotation relative thereto about a horizontal axis, a kerf cutter pivotally mounted on said cutter head and adjustable with said head about the head axis into different cutting positions while said kerl? cutter at all times remains parallel to a line extending longitudinally of said base, and devices for rotating said cutter head about its axis relative to said frame.

63. In a mining apparatus, a portable base, parallel supporting links pivotally connected to said base to swing horizontally relative thereto, a frame supported by said links, a cutter head mounted on said frame for rotation relative thereto about a horizontal axis, and a kerf cutter pivotally mounted on said cutter head and adjustable with said head about the head axis into different cutting positions while the kerf cutter at all times remains parallel to a line extending longitudinally of said base, said parallel links maintaining said cutter head axis always parallel to a common straight line during swinging of said links horizontally about their pivots.

64. In a mining apparatus, a portable base, parallel supporting links pivotally connected to said base for swinging movement in a horizontal direction relative thereto, a frame supported by said links, a cutter head mounted on said frame for rotation relative thereto about a horizontal axis, and a kerf cutter pivotally mounted on said cutter head and adjustable with the head about the head axis while the kerf cutter always remains parallel to a line extending longitudinally of the apparatus.

65. In a mining apparatus, a portable base, a rotatable cutter head, a kerf cutter pivotally mounted on said cutter head and adjustable with said head about the head axis into different cutting positions while the kerf cutter at all times remains parallel to a line extending longitudinally of said base, and an adjustable parallel motion supporting structure between said base and cutter head by which the latter is supported and relative to which said head is rotatable for swinging said cutter head laterally in either direction relative to the base while the head axis always remains parallel to a horizontal line extending longitudinally of the apparatus.

66. In a mining apparatus, a portable base, a parallel motion device including an arm pivotally mounted on said base and a second arm pivotally supported on said rst arm about an axis parallel with the pivotal axis of the rst arm, said second arm overhanging said base, and.

vit

a :'kerf .1 cutter pivotally mountedvfo'n the .forward overhanging :extremity 1 of` said second arm, said armsbeingwadjustable aboutktheirpivotal axes to movesaidlkerf cutter horizontally'to cut-a horii j zontalskerfand saidv secondiarm being: swingablel relative tosaidfirst armfto swing saidkeri cutterhorizontally.relative 'tof said basanand means Y forla'djusting said `.arms i relativeito said. base.

, arrnsbeingiadjustable about tlieir'pivotal-axes toizmovesisaid kerf cutter `horizontally tocut a horizontal vkerl, andmeans feriadjustingsaid :arms` relative to said `loasegsai'd second armlbeing iswingable,horizontally relative to j the iirst arm while the latter lremains stationary as v regards swinging movement about its ownaxis;`

` 168.1na mining apparatus, a portable base, aparallel motion deviceincludingA an arm pivot- 'ally'mounted on saidbase and a second arm piv- Jotally. mounted on saidrst arm, said second arm :overhanging said base, lal cutter head rotatably` mounted on the uter overhanging extremity of saidf second arm, and a kerf cutter pivotally mountedfon said cutterhead `and adjustableiwith said heada'bout theihead axis into diierent cutting positions, said armsbeing adjustable to move `said kerf lcutter into different cutting positions, `and lmeansffor adjusting said'armsfrelativeto Isaid-base. i

69. In va mining apparatus, a portable-base,

laparallel motion `device includingV an arm pivotally-mounted on said lbaseand a `second arm .pivotallyfmounted on said1.rstarm,`said second `arm overhanging said bas`e,. a cutter head rotat- :ablymounte'd on' the outer overhanging extremity `osaid second arm,tand .a lerf cutter pivot- .ially :mounted onsaid cutter'iheadfand. adjustable -with `said, head about the head axis` into. different cuttingpositions, said arms being adjustable to "move `saidl-kerf cutter into `different cutting positions, and means for adjustingisaid arms. relative ,to-said base, said second arm being `swingable frelative 1 tol tlieiirst `arm4 while" the latter" remains :stationary as regards swingingtmovement about its own-axis. l i f `'70. In a mining apparatus, aportablebase, an larmpivotallymounted at itsforwardiend at the `forward endoi said base, a `second arm supported by said lfirst arm and pivotally :mounted .atitsv rear end on lthe rear end oi saidlfnst arlinfsaid second arm extending. forwardly .in advance .dof

saidbase,fanda kerf cutter pivotallyvrnounted on the outer extremity ci said'secondarm. T71. Inga `mining apparatusga portable base,

a1-parallel motion arm structure'pivotallyimount- `ed on said baseiorhorizontal swinging fmove- :ment relative thereto, atcutteiV head rotatably mounted on the forward extremity oi 'said arm base,. and means for: adjusting.y said' head/axis` out fof :parallelism lwith said .longitudinally extendiingline.` l l f' i V72. :In .laniiningapparatusy a portable base, an varm structurepivotally mounted on said base to Swing :horizontallyrelative thereto about a Yverticalaxis, ai frame supported on the outer extreinityxof said armstructurefandto which. said arm:structureV is vpivotally connected, said frame beingswingable about a parallelk axisrelativet'o said arm structureJandsaid 'arm structure providing a`zparallel motion device connectingsaid irameitossaid base, a cutter head mounted on said frameiorrotationrelative thereto about a M*l3.`ln a miningapparatuaa portable base, an

arm structure pivotally mounted on Ysaid basetto swing horizontally relative. thereto about :a verticalfaxisa rarnesupported on the outer extremity of `said varm `structure and to which said arm structure ispivotally connected, saidirame Vbeingswingable about` a parallel axis relative .to said armstructure'and said arm structure pro- `viding'a parallel motionzdevice connecting said frame to said base, .a cutter head mounted on said frame for rotation :relative thereto about a horizontalaxis, aikerf cutter pivotallyinountedon said cutter head, devices for rotating said cutterhead about its axis; and for swinging said kerf cutter about its pivot, and motor operated devices-for swinging Vsaid arm structurezhorizon tally `relative'ito said base.

lapin a mining apparatus, a portable base, an arm structure pivotally mounted onsaid base toswing horizontally relative thereto aloouta verticalaxis, aframe supported on the outer extremity of said arm structure and` to which said arm structure ispivotally connected, said frame lbeingzswingable about afparallelaxis relative to said larm structure, a cutter' head mounted on said frame 'for rotation nrelative thereto about afhorizontalaxia a kerfcutterpivotally mount- .ed on `said cutter head,` devicesfor rotating said `cutterhead about its axis andior swinging said .kerl cutter-about` its pivot, and motor operated rdevicesiorvswinging said armstructure horizontally relative to said base-and including a motor supported `on saidbase andrelative to which said arm structure is swingable.

75.1na mining apparatus, a portable base, an Yarm structure pivotally mounted on said base for horizontal swinging movement relative thereto `about a 4vertical axis, a frame supported on the outer Yextremity of, said arm structure and to which `the llatter is `pivotally connected, said framebeing' swingable about a parallel axis relative to said arm `structure and said arm structure providing a parallel motion device connecting said franiefto saidbase, a cutter `head supported bysaid frame-for rotation relative thereto about a horizontal axis, a kerf cutter mounted on said 'cutter head and adjustable with said` head into horizontal and vertical cuttingpositions, devices ,iorfrotating said head about its axis, and motor operated` devices `for driving said kerf cutter.

` 'nl'n ainining apparatus,V a portable base, an arm structure including an yarm element `pivotailymountedon the forward `end ofsaid base to" swing ina horizontaldirection relative thereto` about a vertical axis, lierf Y cutting mechanism includinga'kerf cutter 4having orbitally movable Icuttingelementsand mounted on the outer extremity off saidY :arm i structure and adjustable relativek thereto intohorizontalV and vertical cutting positions, said korf cutting mechanism'zand arm structure being adjustable relative to said base to position said kerf cutter to cut parallel vertical kerfs parallel to the longitudinal median line of said base, a motor carried by said base and relative to which said arm structure is swingable, and devices driven by said motor for actuating said kerf cutter to effect movement of its cutting elements in their orbits.

77. In a mining apparatus, a portable base, an arm structure including an arm element pivotally mounted on the forward end of said base to swing in a horizontal direction relative thereto about a vertical axis, kerf cutting mechanism including a kerf cutter' mounted on the outer extremity of said arm structure and adjustable relative thereto into horizontal and vertical cutting positions, said kerf cutting mechanism and arm structure being adjustable relative to said base to position said kerf cutter to cut parallel vertical keris parallel to the longitudinal median line of said base, a motor carried by said base and relative to which said arm structure is swingable, devices driven by said motor for actuating said kerf cutter, and devices driven by said motor for swinging said arm structure relative to said base.

'78. In a mining apparatus, a portable base, a parallel motion device including an arm pivotally mounted on said base and a second arm pivotally mounted on said rst arm to swing relative thereto about an axis parallel with the pivotal axis of the first arm, said second arm overhanging said base, a cutter head rotatably mounted on the outer overhanging extremity of said second arm, and a kerf cutter pivotally mounted on said cutter head and adjustable with said head about the head axis into different cutting positions, said arms being adjustable to move said kerf cutter into different cutting positions, and means for adjusting said arms relative to said base.

79. In a mining apparatus, a portable base, a parallel motion device including an arm pivotally mounted on said base and a second arm pivotally mounted on said first arm to swing relative thereto about an axis parallel with the pivotal axis of the iirst arm, said second arm overhanging said base, a cutter head rotatably mounted on the outer overhanging extremity of said second arm, and a kerf cutter pivotally mounted on said cutter head and adjustable with said head about the head axis into different cutting positions, said arms being adjustable to move said kerf cutter into different cutting positions, and means for adjusting said arms relative to said base, said second arm being swingable relative to the rst arm while the latter remains stationary as regards swinging movement about its own axis.

80. In a mining apparatus, a portable base, an arm structure pivotally mounted on said base to swing horizontally relative thereto, kerf cutting mechanism mounted on the outer extremity of said arm structure and including a plane kerf cutter swingable vertically to cut a vertical kerf, said kerf cutting mechanism and said arm structure being adjustable relative to said base to position the kerf cutter to cut a series of parallel vertical plane kerfs parallel to the longitudinal median line ci said base and between the sides and beyond the opposite sides of said base while said kerf cutter always remains in a vertical cutting position, and means for adjusting said kerf cutting mechanism relative to said arm structure to position said kerf cutter to out a horizontal kerf. Y

81. In a mining apparatus, a portable base, an arm structure pivotally mounted on said base to swing horizontally relative thereto, kerf cutting mechanism mounted on the outer extremity of said arm structure and including a plane kerf cutter having a cutter chain and swingable vertically to cut a vertical kerf, said kerf cutting mechanism and said arm structure being adjustable relative to said base to position the kerf cutter to cut a series of parallel vertical plane kerfs parallel to the longitudinal median line of said base and between the sides and beyond the opposite sides of said base, means for adjusting said kerf cutting mechanism relative to said arm structure to position said kerf cutter to cut a horizontal kerf, and a motor on said base and relative to which said arm structure is swingable for actuating the chain of said kerf cutter.

82. In a mining apparatus, a portable base, an arm structure pivotally mounted on said base to swing horizontally relative thereto, kerf cutting mechanism mounted on the outer extremity of said arm structure and including a plane kerf cutter swingable vertically to cut a vertical kerf, said kerf cutting mechanism and said arm structure being adjustable relative to said base to position the kerf cutter to cut a series of parallel vertical plane kerfs parallel to the longitudinal me-dian line of said base and between the sides and beyond the opposite sides of said base, means for adjusting said kerf cutting mechanism relative to said arm structure to position said kerf cutter to cut a horizontal kerf, and a motor on said base and relative to which said arm structure is swingable for actuating said kerf cutter and for swinging said arm structure relative to said base.

83. In a mining apparatus, a portable base, an arm structure pivotally mounted on said base to swing horizontally relative thereto, a cutter head rotatably mounted on the outer extremity of said arm structure to rotate relative thereto about a horizontal axis, a kerf cutter pivotally mounted on said cutter head to swing relative thereto and adjustable with said head about the head axis into horizontal and vertical cutting positions, said head being adjustable relative to said arm structure and said arm structure being swingable relative to said base to position said kerf cutter to cut a series of parallel vertical kerfs parallel to the longitudinal median line of the base and from one side of the apparatus to the other and beyond the sides of said base, said kerf cutter being adjustable into aforesaid vertical cutting positions while said head remains stationary as regards rotation about its own axis.

84. In a. mining apparatus, a portable base, an arm structure pivotally mounted on said base to swing horizontally relative thereto, a cutter head rotatably mounted on the outer extremity of said arm structure to rotate relative thereto about a horizontal axis, a kerf cutter having orbitally movable cutting elements and pivotally mounted on said cutter head to swing relative thereto and adjustable with said head about the head axis into horizontal and vertical cutting positions, said head being adjustable relative to said arm structure and said arm structure being swingable relative to said base to position said kerf cutter to cut a series of parallel vertical kerfs parallel to the longitudinal median line of the base and from one side of the apparatus to the other and while said head remains stationary as regards rotation about its own axis, and a motor on said base and relative to which said

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