US2007905A

US2007905A - Mining apparatus

Info

Publication number: US2007905A
Application number: US564856A
Authority: US
Inventors: Charles F Osgood
Original assignee: Sullivan Machinery Co
Current assignee: Sullivan Machinery Co
Priority date: 1931-09-24
Filing date: 1931-09-24
Publication date: 1935-07-09
Anticipated expiration: 1952-07-09

Description

C. F. OSGOOD MINING APPARATUS Filed Sept. 24, 1931 July 9, 1935.

8 Sheets-Sheet l m m n A I M C. F. OSGOOD MINING APPARATUS July 9, 1935.

Filed Sept. 24, 1951 8 Sheets-Sheet 2 as ggmw C. F. OSGOOD MINING APPARATUS July 9, 1935.

Filed Sept. 24, 1951 8 Sheets-Sheet 5 July 9, 1935. c -F OSGQOD 2,007,905

MINING APPARATUS Filed Sept. 24, 1931 8 Sheets-Sheet 4- A; Amm- .Zzvewxfar: CMrZaJFOfgood.

July 9, 1935. c QSGQOD 2,007,905 Q MI NING APPARATUS Filed Sept. 24, 1931 8 Sheets-Sheet 5 5 y A my a zzfg C. F. OSGOOD MINING APPARATUS July 9, 1935.

8 Sheets-Sheet 6 Filed Sept. 24, 1931 mm m g.

N @N N N? JfivenZar: CZarZarZ Wayvwi MINING APPARATUS Filed Sept. 24, 1951 8 Sheets-Sheet 7 July 9, 1935.

July 9, 1935. C, F OSGOOD 2,007,905

I MINING APPARATUS Filed Sept. 24, 1931 8 Sheets-Sheet 8 EigJzQ. 179 m Z16 Z26 3 ..--=ij -1 Patented July 9, 1935 FFHQEfv MINING APPARATUS Charles F. Osgood, Claremont, N. H., assignor to Sullivan Machinery Massachusetts 7 Company, a corporation of i Application September 24,1931, Serial No. 564,856

52 Claims.

This invention relates to mining apparatus, and more particularly has reference to improvements in coal mining apparatus of the combined horizontal and shear cutter, wheel mounted type 5 adapted to operate from the mine trackway.

An object of this invention is to provide an improved coal mining apparatus. Another object is to provide an improved coal mining apparatus of the combined horizontal and shear cutter type.

10 A further object is to provide an improved adjustable supporting structure for the cutting mechanism of such an apparatus. Yet another object is to provide an improved. adjustable supporting structure whereby the kerf cutting mechanism may be positioned to cut kerfsrin the coal face in any desired horizontal plane between the mine roof and the mine floor, and to cut vertical kerfs. Another object isto provide, in such an apparatus, improved adjustable kerf cutting mechanism operative'to cut kerfs in the coal face in parallel planes either horizontally or vertically and in intersecting planes, thereby enabling the apparatus to accommodate itself to practically any cutting condition encountered. Yet another object is to provide an improved mining apparatus of the wheel mounted type adapted to operate while supported and guided by the mine trackway and having? improved adjustable kerf cutting mechanism whereby kerfs may be cut at or near the level of the minebottom outside and below the level of the mine trackway, in any desired horizontal plane between the mine roof and mine floor, and in vertical planes. A still further object is to provide, in a mining apparatus of the aforesaid character, improved adjustable kerf cutting mechanism whereby a vertical or shear cut may be inserted in the coal face while the apparatus is supported on and guided by a, curved trackway.

40 A still further object is to provide an improved tiltable mounting for the kerf cutting mechanism whereby the kerf cutter may be universally tilted to change its angle in altitude, thereby to accommodate itself to a rolling or'uneven bottom. An-

other object is to provide an improved coal mining apparatus of a truly universal character wherein an extremely wide range of adjustment of the kerf cutting mechanism is possible whereby kerfs may be cut in the minewall at practically any desired location and while an extremely simple and rugged structure is still retained. These and other objects and advantages of this'invention will, however, hereinafter more fully appear.

In the accompanying drawings, there is shown for purposes of. illustration, two embodiments Fig. 2 is a side elevational view of the apparatus 7 shown in Fig. 1. I Fig. 3 is an enlarged central longitudinally extending vertical sectional View taken substantially on line 33 of Fig.1. V

Fig. 4 is a detail horizontal section taken .on line 44 of Fig. 3. V i

Fig. 5 is a horizontal sectional view taken substantially on line 5-5 of Fig: 3, parts being omitted to facilitate illustration. Fig. 6 is a detail sectional View taken on line 6-6 of Fig. 5.

Fig. 7 is a horizontal sectional view, partially shown in plan, taken substantially on line 1-1 of Fig. 2.

Fig. 8 is a transverse vertical. sectional view taken on line 83 of Fig. 2.

Fig. 9 is a detail vertical sectional View takenon line 9--9 of Fig. 8. r I

Fig. 10 is a transverse vertical sectional view taken substantially on line Hll0 of Fig. 2.

Fig. 11 is a central longitudinally extending vertical sectional view taken substantially on line lI-H of Figs. 1 and 12.

Fig. 12 is a horizontal sectional view taken substantially on line |2-l2 of Fig. 2.

- Fig. 13 is a transverse vertical sectionalview taken substantially on line l."3-l3 of Fig. 1.

Fig. 14 is a detail view illustrating a portion of the mechanism shown in Fig. 13.

Figs. 15 and 16 are views similar to Figs. 1 and 2, illustrating the second embodiment of the invention. 1

Fig. 17'is an enlarged central longitudinally extendingvertical sectional view taken substantially on line l'|l 1 of Fig. 15.

Fig. 18 is a developed horizontal sectional view taken substantially on line |8--l8 of Fig. 16.

Fig.'19. is a longitudinallyextending vertical sectional View taken on line l9-|9 of Fig. 18. a

Fig. 20 vis .a horizontal sectional view taken substantially on line 202$l of Fig. 16; i v

Fig. 21 is a transverse vertical'sectional view taken on line 2|2l of Fig.20. r 1

Fig; 22.15 a detail vertical sectional view taken on line 22--Z2 of Fig. 18; A

In the. illustrative embodiment of the invention shown in Figs. 1 to 14, inclusive, thereis shown a coal mining apparatus of the combined horizontal and, shear cutter, wheel mounted type adapted to operate from the mine trackway and generally comprising a portable base, herein in the form of a truck frame I, mounted on wheels 2 adapted to run along a mine trackway 3. Supported on the truck frame I for vertical and universal tilting adjustment relative thereto is a turntable supporting frame 4 having swiveled thereon for rotation about a substantially vertical axis, a turntable 5. Mounted at the forward edge of the turntable and overhanging the frame structure 4 is a rigid frame 6 supporting, through an adjustable parallel motion supporting structure I, a rotatable cutter head 8. Suitable motor operated devices are provided for elevating and universally tilting the turntable, for operating the adjustable supporting structure, for rotating the cutter head and operating the cutting mechanism, and for driving the truck wheels to propel the apparatus along the mine trackway, as will hereinafter be described.

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 the sup porting frame 4 herein in the form of an annulus or ring l0 having attached thereto a plurality of, herein three, depending brackets the lower ends of which are shaped to engage, respectively,

with upstanding guide members |2, herein in the form of screw pedestals, which are secured to the truck frame. These screw pedestals serve as guides to prevent any substantial lateral movement of the turntable supporting ring and attached parts relative to the truck frame during adjustment of the turntable. Secured to these depending brackets II are screw nuts |3 (see Fig. 6) which are threadedly engaged with vertical screws |4 supported at their upper ends by the upstanding guide members l2 and at their lower ends in step bearings l5 formed in bearing brackets l6 attached to the bottom of the truck frame. It will be noted that the nuts I3 are so connected to the feet of the depending brackets as to permit a slight relative rocking movement between the parts. The three sets of screws and guide members constitute upright supports for the annular supporting frame or ring l0, and the latter can be adjusted vertically in parallelism or angularly to change its angle in altitude by suitable rotation of the screws. The mechanism for separately or simultaneously rotating the screws will be later described. The turntable 5 supported by the annular frame I0 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 I0 and is guided for rotative movement in the ring by a depending annular flange 11 fitting the interior periphery of the ring and by a radial flange l8 overlying the top surface of the ring. In the outer edge of the turntable casting is formed a series of notches H3, and cooperating with these notches is a slidable locking bolt 20 mounted in a guideway formed within a bracket 2| secured to the annular supporting frame ID. The locking bolt when in its inner position is adapted to project within one of the notches l9 to lock the turntable 5 against rotation relative to the annular supporting frame Ill.

Motor operated devices are employed for rotating the turntable 5, and herein comprise a motor 22, herein preferably of the reversible electric type, suspended beneath the turntable casting within the lateral limits of the annular supporting frame It. The power shaft 23 of this motor is horizontally disposed and extends transversely across the turntable and has fixed thereto a bevel pinion 24 meshing with a bevel gear 25 fixed to a vertical shaft 26 suitably journaled within the turntable casting. Fixed to and driven by the shaft 26 is a spur gear 27 meshing with a spur gear 28 suitably fixed to a vertical shaft 29, herein arranged parallel with the shaft 26 and likewise suitably journaled within the turntable casting. Secured to the shaft 29 is a worm 30, which is herein the slow speed worm, meshing with a slow speed worm wheel 3|, the latter being connectiole by a multiple disc clutch 32 of a usual design, to a horizontal shaft 33. Fixed to and driven by the shaft 33 is a worm 34 meshing, as shown in Fig. 3, with a worm wheel 35 rotating about a vertical axis and suitably journaled within the turntable casting. This worm wheel drives a vertical shaft 36 connectible by a sliding clutch 31 to a spur gear 38 supported by the shaft and meshing with the teeth of a circular rack 39 formed on the inner periphery of the annular supporting frame Hi; the gear 38 when released'from the shaft 38 being freely rotatable on the shaft. Also meshing with the spur gear 27 is a spur gear 40 secured to a vertical shaft 4| arranged parallel with the

shafts

26 and 29, and driven by this shaft is a worm 42, which is herein the fast speed worm, meshing with a fast speed worm wheel 43. This worm wheel is connectible by a multiple disc clutch 44, similar to the clutch 32, to the shaft 33. It will thus be seen that when the clutch 31 is connected and one or the other of the

clutches

32, 44 is applied, the turntable 5 may be rotated relative to the annular supporting frame ill'to swing the cutting mechanism at either a relatively high positioning speed or a relatively low cutting speed. If desired, the teeth of the worm gears 34, 35 may be self -locking and thereby lock automatically the turntable against rotation when the

clutches

32, 44 are released, thereby eliminating the necessity of the separate turntable lock I9, 20 described above. The turntable release clutch 37 comprises, as shown in Figs. 3 and 4, clutch plungers 45 guided within slots 4% formed in the shaft 36. Rotatably mounted within the shaft 35 is a clutch operating shaft 4'! having an operating handle 48 and formed on its lower end a pair of grooves 49. When the element 47 is in the position shown in Fig. 4, the clutch plungers are projected within notches 50 formed in the ear 38, thereby locking the gear to the shaft 36. When the element 47 is turned to bring the grooves 48 in registry with the slots 46, the clutch plungers are free to slide inwardly, thereby to release the gear 38 from the shaft 36. The clutch 31 when 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 it, for a purpose to be later mentioned.

Now referring to the kerf cutting mechanism, and more particularly to the adjustable supporting structure therefor, it will be observed that formed integral with the rigid frame 6 are parallel longitudinal frame portions 5|, 5|, and journaled within these frame portions is a transverse hinge shaft 52 arranged with its axis horizontal. Pivotally mounted at its rear end on this hinge shaftis a main supporting link member or arm 53, and this link member has pivotal connection at its forward end with a transverse shaft 54 connected to the cutter head supporting or neck frame 55. A secondary link member or arm 55 is pivotally connected at its endsv to

transverse hinge shafts

51 and 58, respectively, connected to the frame portions 5 I, 5| and the cutter head supporting frame 55. The cutter head 8 is mounted on the neck frame 55 for rotation relative thereto about a horizontal axis extending radially with respect to the turntable axis. The

links

53, 55 cooperate to forme parallel motion structure for the cutter head whereby the latter may be adjusted in any desired position between the mine roofand mine floor while the head axis is maintained parallel to a common straight line perpendicular to theturntable axis.

' Now referring-to the specific cutting mechanism, it will be noted that the supporting frame 55 has attached thereto a cylindrical bearing sleeve 59 and rotatably mounted on this sleeve is a cylindrical supporting frame 69 having an inwardly directed annular retaining flange GI and attached to the cutter head frame 52. Mounted onthe cutter head frame for rotation about an axis at right angles to the axis of the cutter head is a cylindrical supporting frame 63 rotatably mounted in. a bore 64 formed in the cutter head frame. A thrust ring 65 attached to the cutter head frame: serves to retain the frame 63 in its bore. Attached to the frame 63 is a support or hanger 66 which carries the cutter bar 61. Mounted for orbital movement on the margin of the cutter bar 61 is a usual cutter chain 68.

The mechanism for actuating the cutter chain comprises a bevel gear 65 fixed to and driven by the verticalshaft 26' (see Fig. 3) and meshing with a bevel gear I0 fixed to a horizontal shaft I I. This shaft extends radially with respect to the turntable axis and is suitably journaled within the turntable casting and rigid head 6, asshown in Fig. 3. Fixed to the forward end of the shaft II is a bevel pinion I2 meshing with a bevel gear "I3 loosely mounted on the hinge shaft 52. Meshing with the bevel gear I3 is a bevel gear I4 fixed to a shaft I5 suitably journaled in bearings 15 carried by the link member 53. The forward end of the shaft I5 carriesa bevel pinion T1 meshing with a bevel gear I8 loosely mounted on the hinge shaft 54. Meshing with the bevel gear 13 is a bevel gear 19 (see Figs. 11 and 12) fixed to a shaft 85 extending through the neck frame along the axis of the rotatable cutter head 8. This shaft 85 is journaled at its ends within the neck frame 55 and cutter head frame 62. Herein fixed to the front end of the shaft is a bevel pinion BI meshing with a large bevel gear 82 journaled on a shaft 83 arranged with its axis coincident with the axis of bar swing. The shaft 83 drives a sprocket 84 which in turn engagesand drives the cutter chain 63 in a well knownmanner. The gear 82 is connectible to the shaft 83 by a sliding jaw clutch 85 having a usual clutch shipper 86 operated by a handle 81. It will thus be seen that irrespective of the adjusted position of the cutter head relative to the truck, the cutter chain 68 may at all times be driven, and that by simply releasing the clutch 85 the cutter chain may re main idle during running of the motor.

Now referring to the improved'mechanism for effecting swingingof the cutter bar about its pivotal axis relative to the cutterhead, it will be noted that fixed to the shaft 83 and driven thereby is a bevel pinion B9 constantly meshing with reversely rotatable bevel gears 95, 9i loosely journaled on a transverse shaft 92 in turn suitably journaled within the cutter head frame 52. The reverse bevels 95, SI are selectively connectible to the shaft 92 by'means of

multiple disc clutches

93 and 94, respectively. of a usual design operated by a suitable shipper mechanism 95 controlled by 6. Connectible to the shaft a handle 95. Connectible to the shaft 92 is a wormtl meshing with a worm wheel Slifixed to a shaft 39 arranged parallel with the shaft 83 and likewise journaled in the cutter head frame. Also fixed to the shaft 99 is'a spur pinion I00 mesh v ing with the teeth of an internal gear IIJI herein formed integral with the cylindrical supporting frame 63 for the cutter bar 61. 'The worm 91 is connectible to the shaft 92 by a sliding clutch element I52 and cooperating clutch elements I03 and i5 1 carried by the worm and shaft respectively. The sliding clutch element I02 is provided with usual shipper mechanism I05 operated by a handle W5. It willthus be seen that The improved mechanism for rotating the cutter head 8 about its axis relative tothe supporting frame 55 herein comprises -a worm Iil'l connectible to: the shaft 92 and meshing with a worm wheel I53 fixed to a longitudinally extending shaft I99 arranged parallel with the shaft as. This shaft is suitably journaled within the cutter head frame and carries a pinion Ilfl meshing with the teeth of an internal gear Ill, herein formed integral with the cylindrical bearing sleeve 59 on which the cutter head 8 isrotatably mounted. The worm I0! is connectible to the shaft 92 by a sliding clutch element H2 cooperating with clutch elements H3 and-I M carried by the worm and shaft respective ly. This sliding clutch element is provided with usual shipper mechanism II5 operated by a handle I I 5. It will therefore be evident that the cutter head may be rotated about its axis in eitherof opposite directions under the control of

friction clutches

53, 54. The worm gearings 91, 98 of the bar swinging mechanism and I01, I08 of the head rotating mechanism are self-locking, and upon release of the clutches I05, II2 maintain automatically the cutter bar and head in their positions of adjustment.

Meohanismisprovided for adjusting the parallel motion supporting structure I by power to vary the elevation of the cutter head 8, and herein bomprises worm gear teeth H9 formed on segmental portions I25 integral with the link 53 and overlapping the frame portions 5|, 5i of the rigid frame 6. Meshing with these worm gear segments are parallel worms I2I fixed to parallel shafts I22 suitably journaled Within the rigid frame '5. Fixed to these shafts are worm wheels I23 withwhich mesh worms I24 fixed to a horizontal shaft 525, herein arranged transversely of and suitably journaled within the rigid frame I25 by a sliding clutch I26 is a spur gear I21 meshing with an idler gear I28, which in turn meshes with a spur gear I29 journaled on the hinge shaft 52. The gear I29 is herein formed integral with and driven by the bevel gear 13 of the cutter chain driving mechanism. It will thus be seen that when the clutch I25 is connected, the parallel link structure may be swung upwardly or downwardly relative to the turntable 5 to position the cutter head into different parallel planes, as desired. The worm gearing H5, I2I is of the self-locking type and automatically maintains the parallel link members in their different positions of adjustment.

Now referring to the mechanism for driving the truck wheels and actuating the elevating screws I l, it will be noted that mounted on the truck frame is a motor I3 I, which may be of the reversible electric type having its power shaft connected to a worm I32 meshing with a worm wheel I33 rotatably mounted on a transverse shaft I34 suitably journaled within a frame I35 suitably secured to the truck frame. This worm wheel I33 may be operatively connected to the shaft I34 by means of a multiple disc clutch I36 of a usual design having suitable operating mechanism including a hand lever I31. Fixed to this transverse shaft I34 is a brake drum I38 which is engaged by a brake band I39 also arranged to be controlled by the hand lever I31. When this hand lever is swung in one direction the clutch I36 is applied and the brake I39 released and in the opposite direction the brake is applied and the clutch released. J ournaled on the shaft I34 is a spur gear I40 connectible with the shaft by a jaw clutch member I4I splined to the shaft, and this gear meshes with a spur gear I42. The spur gear I42 is connected to a transverse shaft I43 suitably journaled within the frame I35. Keyed to the shaft I34 is a spur pinion I44 meshing with a spur gear I45 secured to a transverse shaft I46 (see Fig. 14) arranged parallel with the shaft I34. Splined to the shaft I46 is a slidable pinion I41 adapted to mesh with a spur gear I48 keyed to a sleeve I49 herein formed integral with the spur gear I40. If desired, operating mechanism may be provided for the clutch MI and the sliding pinion I41 so that when one is connected the other is released. As illustrated, secured to the shaft I43 is a chain sprocket I50 connected by an endless chain connection I5I to a chain sprocket secured to the rear truck axle. The front and rear truck axles are connected together by a usual chain and sprocket connection I52. From the foregoing description it will be evident that when the jaw clutch MI is shifted to connect the spur gear I40 to the shaft I34 and the pinion I41 is out of mesh with the gear I 48 the truck wheels may be driven at a relatively high speed from the motor I3I through worm gearing I32, I33, friction clutch I36, shaft I34, spur gearing I40, I42 and the chain and sprocket connections I50, I5I and I52. It will also be evident that when the jaw clutch MI is in its released position and the spur pinion I41 is slid into meshing engagement with the gear I48, the truck wheels may be driven at a relatively slow speed appropriate for cutting through the reduction gearing I44, I45, I41 and I48. Upon reversal of the motor I3I the truck wheels may be driven to propel the apparatus in a reverse direction at either a relatively high or a relatively low speed.

The mechanism for driving the screws I4 from the motor I3I herein comprises a bevel pinion I53 (see Fig. 13) journaled on the shaft I34 and con nectible to the shaft by the jaw clutch I4I. This bevel pinion meshes with a bevel gear I54 fixed to a vertical shaft I55 suitably journaled within the frame I35. Keyed to the lower end of the shaft I55 is a chain sprocket I56 which engages and drives an endless transmission chain I51. Idler sprockets I58 and I59 serve to guide the chain I51 relative to chain sprockets I60 rotatably mounted upon each of the screws I4 at its lower end, and these sprockets are driven by the endless chain I51. As shown in Fig. 6, the chain sprockets I60 have formed thereon clutch teeth I6I adapted to engage with similar teeth on clutch members I62 splined to the lower end of the screws. The screws extend downwardly through openings in the top plate of the truck frame, and the clutch members I62 are each provided with a groove I63 in engagement with an arm I64 attached to a vertical operating shaft I65. The shafts I65 extend through the top plate of the truck and are each provided with a conveniently located handle I66 by which the movement of the clutch members I62 may be controlled. It will thus be seen that when all the clutches I62 are in a position to connect the chain sprockets I60 to the screws I4, the latter may be simultaneously rotated to move the turntable 5 together with the cutting mechanism supported thereby, into different elevated positions relative to the truck frame. It will also be noted that by releasing certain of these clutches and connecting certain others, the screws may be so rotated to effect tilting movement of the turntable about a horizontal axis to change its angle in altitude.

In the illustrative embodiment of the invention shown in Figs. 15 to 22, inclusive, there is shown a mining apparatus of the same general character as that in the embodiment of the invention described above, and having the same vertically adjustable and universally tiltable turntable structure and the same mechanisms for rotating and adjusting the turntable and for driving the truck wheels to propel the apparatus, and also having the same motors 22 and I3I for driving the various devices of the apparatus. In

this form of the invention, the circular turntable castinghas formed integral therewith an arm structure I10 extending radially with respect to the turntable axis and overhanging the annular supporting frame I0 and rigidly braced with respect to the turntable casting by horizontal webs I1I. In this construction, formed integral with this arm structure at its outer extremity is a circular frame I12 arranged in a substantially vertical position and rigidly braced with respect to the arm by means of vertical webs I13. As shown in Fig. 17, secured to this circular frame I12 is an annular retaining and bearing sleeve I14 having an inwardly directed flange I15. Between this flange and. shoulder I16 formed on the circular frame I12, there is rotatably mounted a sleeve I11 which herein forms a rotatable neck for a cutter head I18. This sleeve I11 is secured to a projecting neck member or frame I19 by which the cutting mechanism is supported, as will later be described.

The mechanism for effecting rotation of the cutter frame I18 about the neck axis herein comprises a spur gear I fixed to the shaft H and meshing with a spur gear I8I fixed to a parallel shaft I82. Fixed to this shaft is a bevel pinion I83 meshing with reverse bevels I84, I85 (see also Fig. 21). These reverse bevels are alternatively connectible by multiple disc clutches I86 and I81, respectively, of a usual design, to a transverse shaft I88 suitably journaled within the turntable casting. These clutches are provided with any suitable operating means including a shipper member I89 actuated by an operating rod I 90 having an operating handle I9I. Suitably secured to the shaft I88 is a worm I92 meshing with a worm wheel I93 fixed to a horizontal shaft I94 arranged parallel with the shaft II and likewise suitably journaled within the turntable casting. Fixed to the forward end. of the shaft I94 is a spur pinion I95 meshing with an internal gear I06, herein formed integral with the sleeve I11, by which the rotatable cutter frame I18 is supported. It will thus be seen that upon suitable application of the clutches I86, I81, the cutter frame I18 may be rotated about the neck axis in 7 one direction or the other to. position thecutting mechanism into a plurality of intersecting planes about the neck axis. .The worm gearing I92, I93

is of the self-locking type, and when the clutches I36 and I81 are released, automatically locksthe cutter frame against rotation about the axis ofthe neck, thereby maintaining the cutting mechanism in any of its adjusted, positions about the;

neck axis.

The cutter frame H8 is supported on the ro-= tatable neck frame I'I9 through a parallel link structure substantially-similarto the link structure in the embodiment of the invention described above, and comprises parallel frame portions I98 integral with the neck frame I79. and extending parallel tozand equidistant from the axial line of the neck. Supported within these frame portions I98 is a transverse hinge shaft I99 arranged with its axis perpendicular to and inter- .secting the axial line of the neck, and pivotally mounted at its rear end on this hinge shaft is a main supporting link member or arm 208,, and

this link member has pivotal connection at its forward end with a transverse shaft 2IlI connected to the frame of the cutter head I78. A secondary link member or arm 2B2 ispivotally connected at its ends to transverse hinge shafts 203 and 204, respectively connectedto the neck frame I19 and the cutter frame I18. These arms or links form a parallel motion structure and are so arranged that as they swing about their pivots into different angular positions relative to the neck axis, the cutting mechanism is maintained the cutter frame I18 and carries onits margin' for circulation thereabouta usual cutter chain 201. The driving mechanism for the cutter chain is substantially the same as in the embodiment of the invention above described, with the exception that the shaft 30 is journaled within the frame of the cutter frame I18 and has fixed thereto and drives bevel pinionQIlll (see Fig.

19) meshing with a bevel gear 289' fixedto a vertical shaft Elli arranged with its axis coinci dent with the bar pivot axis and suitably journaled within the cutter frame. Fixed to the shaft 2) is a chain sprocket 2I I whichengages and drives the cutter chain 207 in a usual manner.

The mechanism for swinging the cutter bar 205 about its pivot herein comprisesa spur gear 2I2 meshing with the idler gear I28 of the parallel link swinging mechanism above referred to and rotatably supported on the transverse shaft 203. Formedon the hub of thespur gear 2I2 is a bevel gear 2I3 meshing with bevel'gear 2I4 fixed toha shaft 2I5 suitably, journaled on the link 202. Fixed to the forward end, of this shaft is a bevel gear 2E6 meshing with reverse bevels 2H and 2I8 rotatably supported by a transverse shaft 2H) journaled on the link 2112; and these bevels are alternatively connectible to the shaft by a jaw clutch 229. Fixed to the shaft 2I9 is a bevel gear 22I meshing with a bevel gear 222 V secured to a shaft 223 journaled at the side of thelink 202 and driving a worm224 meshing with a worm wheel 225 fixed to a transverse shaft 226. Secured to the shaft 226 is a worm 221' meshing with a worm wheel .228 journaled on the hub portion of one of the annular bearing members 229 for the cutter bar. Pivotally mounted at 230 on the cutter bar support is a latch 23I which when in the position shown in Fig. 19

engages the teeth of the worm wheel 228to con nect rigidly the latter to the cutter bar. Any

suitable means 232 is employed for holding the latch23l in its gear engaging position, this means being releasable at will to permit release of the latch from the gear, thereby to permit free swinging of the cutter bar about its axis, It will herein be noted that upon connection of one or the other of the reverse bevels 2I'I, I28 to the shaft 2I9, the cutter bar may be swung in one direction or the other about its pivotal axis relative to the cutter frame, and that when the clutch 220 is I33,= I40; I42 driven by the motor I3I, it being understood that at that time the cutter head 8 is swung upwardly from the position shown in Fig. 2 to a position wherein the cutter bar is disposed above the level of the trackway.

When the working face. is reached, the fast truck wheel drive is disconnected from the motor by releasing the friction clutch I36 and the sliding clutch I4I. If it is desired to make-a swinging cut at or near the level of the mine bottom in front of the end of the trackway, the cutter bar is initially moved into the position shown in Fig. 2. The operator then connects the sliding clutch I02, and upon application of the friction clutch 93 of the bar swinging mechanism the cutter bar; 61 is swung about its pivot relative to the cutter head from the central position shown in Fig. 1 laterally'to a position wherein the tip end 'of the bar is disposed adjacent the right hand rib of the entry, the clutch 93 thereafter-being released. The operator then shifts the sliding clutch 85 into a position to connect the shaft 83 to the gear 82, thereby connecting the cutter chain in driving relation with the motor 22; and as a result the cutter chain 68 is rapidly circulated about the margin of the cutter bar. swinging mechanism is then applied and the cutter bar is swung transversely in its plane from right to left across the front end of the trackway at a relatively slow cutting speed to make an arcuate cut beneath the coal. When the tip end of the cutter bar reaches a position adjacent the left-hand rib, the clutches 94 and IE2 are released. The apparatus is then propelled bodily rearwardly along the mine trackway to move the cutter bar away from the coal face, and the cutter bar is thereafter swung into its central position shown in Fig. 1. The clutch I26 of the parallel link swinging mechanism is then connected, and the link structure is swung upwardly to move the cutter bar into its transport position above the level of the trackway. The apparatus is then propelled rearwardly along the mine trackway under the propulsion of the high speed gearing I32, I33, I40, I42 driven by the reversible'motorI3I.

If it'is desired to cut a horizontal kerf at or near the level of the mine bottom outside and below the level of the mine trackway in accord- The friction clutch 94 of the bar zontal cut thereunder.

ance with the arcwall method, the operator applies the friction clutch 44 of the fast speed turntable swinging mechanism, thereby causing the turntable 5 together with the cutting mechanism supported thereby, to be swung horizontally at a positioning speed from the central position shown in Fig. 1 to a position wherein the pivot of the cutter bar 6! lies outside of the trackway. During horizontal swinging movement of the turntable relative to the truck, the cutter bar 61 may be swung simultaneously about its pivot in the opposite direction relative to the cutter head 8 under the control of the clutch 94 of the cutter bar swinging mechanism until the tip end of the cutter bar assumes a position adjacent the right-hand rib at a less angle than the angle of the parallel link supporting structure relative to the rib. When the parts are thus disposed with the bar pivot lying outside the mine trackway, the operator releases the friction clutch 94 of the bar swinging mechanism, and the clutch I26 of the parallel link swinging mech-.- anism is then connected and the parallel arms are swung downwardly to position the cutter bar at or near the level of the mine bottom, as shown in Fig. 2. The clutch I26 is then released and the jaw clutch 85 is connected, connecting the cutter chain in driving relation with the motor 22. The pinion I41 of the slow speed truck driving mechanism is then slid into meshing engagement with the gear [48 and upon application of the friction clutch I36 the truck wheels are driven to propel the apparatus bodily in a forward direction along the mine trackway at a relatively slow cutting speed, sumping the cutter bar 61 beneath the coal. The friction clutch I36 is then released and the brake I38 set. The operator then applies the friction clutch 32- of the slow speed turntable swinging mechanism, and the turntable together with the cutting mechanism supported thereby is swung horizontally at a slow cutting speed to effect horizontal swinging movement of the cutter bar in its plane across the coal face to make a hori- During the initial swinging movement of the turntable 5 the cutter bar 61 is swung about its pivot under the control of the clutch 93 in a reverse direction until the parts assume a straight-line position wherein the cutter bar extends parallel to a line including the bar pivot and the turntable axis. After the tip end of the cutter bar has reached the lefthand rib and the. swinging cut beneath the coal has been compl ted, the cutter bar 61 is again tswung about its pivot in a direction opposite from the direction of turntable rotation, under the control of the friction clutch 93 of the bar swinging mechanism while rotation of the turntable 5 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 an-. gle of the parallel arm structure relative there- ;.:;to. The

clutches

32 and 93 and the brake I38 .way at a slow cutting speed, moving the cutter bar from beneath the coal. After the completion of the cut beneath the coal, the parts are again returned to their transport position, with the cutter bar disposed in an elevated position ,1 above the mine trackway.

A horizontal kerf may be cut at or near the level of the mine roof simply by connecting the clutch H2 and applying one or the other of the

friction clutches

93, 94 of the head rotating mechanism to effect rotation of the cutter head 8 about the neck axis, thereby swinging the cutter bar through an arc of a circle from the position shown in Fig. 2 to its opposite horizontal position above the head axis. The clutch I26 is then connected and the

parallel link members

53 and 56 are swung upwardly about their pivots to move the cutter bar 61 to a position adjacent the mine roof. The cutter bar is then sumped in, swung transversely in its plane, and withdrawn from the coal, in accordance with the usual arcwall method of cutting.

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, the cutting mechanism may be universally tilted to change its angle in altitude, simply by disconnecting certain of the elevating screws I4 from the motor I3I 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 for the front elevating screws I4 while the rear elevating screw is connected to the motor I31, 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

93, 94 of the head rotating mechanism, thereby rotating the cutter head about the neck axis to bring the cutter bar 6'! into a position to. swing vertically. During the shearing operation, the cutter bar is first sumped in, then swung downwardly in its plane, and thereafter withdrawn from the coal, in a manner similar to that described above in connection with horizontal cutting in accordance with the arcwall method. It will further be noted that by rotating the cutter head the cutter bar may be moved through an arc of a circle to shearing positions at either side of the cutter head axis, thereby enabling vertical kerfs to be cut in the coal face in parallel planes.

When it is desired toinsert 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 manner. With the cutter bar 61 in shearing position, the turntable 5.is rotated to move the cutting mechanismlaterally until the tip end of the cutter bar engages the rib of. the. entry. The turntable is thenlocked against rotation and 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 mine trackway at a slow speed to cause the tip end of the cutter bar to penetrate the coal. The turntable lock is then released and the turntable is permitted to rotate freely relativetothe truck as the apparatus is propelled. bodily along the mine trackway, and as a, result, as the apparatus moves along the curved trackway the cutter bar is sumped within, the coal in the. manner well known to those skilled in the, art, the free rotation of. the turntable relative tothe truck as the latter moves along the trackway preventing binding of the cutter bar in the'kerf; The cutter bar is then swung downwardly in its plane and withdrawn from the coal. i i

In the form of the invention shown in Figs. to 22, inclusive, the apparatus operates to make horizontal and vertical or shear cuts in the same manner as the form of the apparatus described above andtherefore, a detailed description of these methods of cuttingiisunnecessary. Howe ever, in this form of the apparatus the cutting mechanism and the parallel link supporting structure are both mountedfor rotation about theneck axis relative to the turntable, and as a result when the cutter bar is in its vertical cutting a position it may be moved by swinging the parallel arms into any desired location between the ribs of the entry. In this form of the invention, the

i cutter bar is moved into its different cutting posian improved coal mining apparatus is provided,

having, improved adjustable kerf cutting mechanism whereby horizontal kerfs may be out at or near the level of the mine bottom, outside and below the level of the mine trackway, and ver-' tical cuts may be out between the ribs of the entry. It will further be noted that by the provision or the improved adjustable supporting structure for the kerf cutting mechanism the cutter bar may be positioned to cut kerfs at or near the level of the mine roof or in any desired parallel planes between the mine roof and the mine bottom. It will also be evident that by the provision of the improved tiltable turntable mounting for the kerf cutting mechanism, the cutter bar may be universally tilted to change its angle in altitude, thereby to accommodate itself to a rolling or unevenbottom. It will still further be noted that an improved coal mining apparatus is provided wherein the adjustingmechanism for the kerf cutting mechanism is extremely flexible, it being possible to operate the apparatus as a mounted bottom cutter, top cutter, center cutter, shear cutter, and slabbing machinaand to operate themachine to malce shear cuts while the machine is supported andguided by a curved trackway; thereby enabling the apparatus to accommo-;

date itself to practically everymining condition encountered within the normal working range of a track cutting machine. These and other uses and advantages of the improved mining apparatus will be clearly apparent to those skilled in the art.

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

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

1. In a mining apparatus, a portable base, a horizontal turntable mountedon said base.-for rotation about a vertical axis and for universal tilting movement relative to the horizontal, an;

adjustable therewith and relative thereto, and

kerf cutting mechanism carriedat the outerIex-I tremity of said arm structure and adjustable relative thereto into horizontal and vertical cutting positions.

2. In a mining apparatus, a horizontal turntable mounted .on said base: for

rotation about a vertical axis and for universal. tilting movement relative thereto, aparallellinkij supporting structure pivotally mounted on. saidturntable and adjustable therewith and relative thereto, and kerf cutting mechanism carried at: the outer extremity of said link supporting struc ture and adjustable relative thereto into hori-,

zontal and vertical cutting positions.

3. In a mining apparatus, a portable base, a horizontal turntable mounted on said basefor:

rotation about a vertical axis and for universal tilting movementrelative to the horizontal, an; arm structure pivotally mounted upon a sub: stantially horizontal axis on said turntable and overhanging said base, and kerf cutting mechanism carried at the outer extremity of said arm structure and including a cutter headrotatable:

relative to said arm structure about a horizontal. axis and a kerf cutter pivotally mounted on cutter head to swing relative thereto. 9 r

4. In a'mining apparatus, a portable base, a

horizontal turntable mounted on said base for rotation about a vertical axis and for universal tilting movement relative thereto, a parallel link supporting structure .pivotally mounted onsaid 5. In a mining apparatus, a portable base, a horizontal turntable mounted on said base for rotation about a vertical axis and for universal tilt-d ingmovement relative to the horizontal, an arm structure pivotally mounted upon asubstantiaily horizontal axis on said turntable and-overhang ing said base, and kerf cutting mechanism carried at the outer extremity of said arm structure and including a cutter head rotatable relative to said, arm structure about a horizontal axis and akerf cutter pivotally mounted on said cutter head and rotatable with said cutter head into horizontal and verticalcutting positions. a

6. In a mining apparatus, a portable base, a, horizontal turntable mounted on said: base for rotation about a vertical axis and for universal tilting movement relative thereto, a. parallel link supporting structure pivotally mounted on said turntable and overhanging said base, and kerf cutting mechanism carried at the outer extremity of said link supporting structure and including a cutter head rotatable relative to said'supporting. structure about a horizontal axis and a kerf cutter pivotally mounted on saidcutter, head and rotatable with said cutter head into horizontal and vertical cutting positions.

. '7; In a mining apparatus, a portable base, a

arm structure pivotally mounted upon a sub-1 stantially horizontal axis on said turntable and portable base, a

said.

said arm structure and adjustable relative thereto into horizontal and vertical cutting positions.

8. In a mining apparatus, a portable base, a horizontal turntable mounted on said base for rotation relative thereto about a vertical axis, a parallel motion supporting structure pivotally mounted on and overlying said turntable and projecting forwardly from its mounting thereon and overhanging said base, and kerf cutting mechanism carried at the outer extremity of said supporting structure and adjustable relative thereto into horizontal and vertical cutting positions.

9. In a mining apparatus, a portable base, an arm structure pivotally mounted on said base at Y the forward end thereof to swing through a wide angular range upon a substantially horizontal axis and extending forwardly in advance thereof, kerf cutting mechanism carried by the outer extremity of said arm structure and adjustable about a horizontal longitudinal axis relative thereto into horizontal and vertical cutting positions, and means for swinging said arm structure horizontally relative to said base.

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

I horizontal turntable on said base, parallel links pivotally mounted on said turntable for swinging movement relative thereto about horizontal axes, a frame supported on the outer extremities of said links and to which the latter are pivotally connected, and a cutter head mounted on said frame for rotation relative thereto about a horizontal axis.

11. In a mining apparatus, a portable base, a support mounted on said base for universal tilting movement relative thereto to change its angle in altitude, parallel links pivotally connected to said support for swinging movement relative thereto about parallel horizontal axes, a frame supported on the outer extremities of said parallel links and to which the latter are pivotally connected, and a cutter head mounted on said frame for rotation relative thereto about a horizontal axis.

12. In a mining apparatus, a portable base, a support mounted on said base for rotation relative thereto about a vertical axis and for universal tilting movement relative thereto to change its angle in altitude, parallel links pivotally connected to said support to swing relative thereto about parallel horizontal axes, a frame supported on the outer extremities of said links and to which the latter are pivotally connected, and a cutter head mounted on said frame for rotation about a horizontal axis.

13. In a mining apparatus, a portable base, a support mounted on said base for adjustment relative thereto into different elevated positions and for rotation about a vertical axis, an arm structure pivotally mounted upon a substantially horizontal axis on said support for swinging movement relative thereto and extending forwardly in advance of said base, and kerf cutting mechanism mounted on the outer extremity of said arm structure and adjustable relative to said arm structure into horizontal and vertical cutting positions.

14. In a mining apparatus, a portable base, a horizontal turntable mounted on said base for rotation about a vertical axis and for universal tilting movement relative to the horizontal, a cutter head mounted on said turntable for rotation relative thereto about an axis extending radially from the turntable axis and for adjustment in a vertical direction relative to said turntable, and a kerf cutter pivotally mounted on said cutter head and adjustable therewith about the head axis into horizontal and vertical cutting positions.

15. In a mining apparatus, a portable base, a horizontal'turntable mounted on said base for rotation about a vertical axis, a cutter head mounted on said turntable for rotation relative thereto about an axis extending radially from the turntable axis and for adjustment in a vertical direction relative to said turntable, a kerf cutter pivotally mounted on said cutter head and adj ustable therewith about the head axis into horizontal and vertical cutting positions, means for always maintaining the head axis horizontal during adjustment of said head in aforesaid vertical direction, and means for propelling said base to effect rectilinear sumping and withdrawal movements of said kerf cutter in any of its adjusted positions about the head axis.

16. In a mining apparatus. a portable base, an annular frame overlying said base, devices between said base and frame for adjusting the latter into different elevated positions relative to said base, a turntable rotatably mounted on said annular frame, a cutter head mounted on said turntable for rotation relative thereto about an axis extending radially from the turntable axis and for adjustment in a vertical direction relative to said turntable, and a kerf cutter pivotally mounted on said cutter head and adjustable therewith about the head axis into horizontal and vertical cutting positions.

1'7. In a mining apparatus, a portable base, a horizontal turntable mounted on said base for adjsutment into different elevated positions relative thereto, an arm structure pivotally mounted on said turntable to swing in a vertical direction relative thereto, a kerf cutter carried at the outer extremity of said arm structure and adjustable relative to said arm structure into horizontal and vertical cutting positions, and means for propelling said base bodily back and forth relative to the mine face to effect rectilinear sumping and withdrawal movements of said kerf cutter.

18. In a mining apparatus, a portable base, a parallel motion parallel link structure pivotally mounted on said base to swing in horizontal and vertical directions relative thereto, a cutter head rotatably mounted on the outer extremity of said link structure, and a kerf cutter pivotally mounted on said cutter head.

19. In a mining apparatus, a portable base, a parallel motion link structure pivotally mounted on said base to swing in horizontal and vertical directions relative thereto, a cutter head rotatably mounted on the outer extremity of said link structure, and a kerf cutter pivotally mounted on said cutter head and adjustable therewith into any desired position completely about the head axis.

20. In a mining apparatus, a portable base, an arm structure pivotally mounted on said base to swing horizontally and vertically relative thereto, a cutter head rotatably mounted on the outer extremity of said arm structure, and a kerf cutter pivotally mounted on said cutter head and adjustable therewith into any desired position completely about the head axis while at all times re maining in a plane parallel with the head axis during such adjustment.

21. In a mining apparatus, a portable base, a support mounted on said base for rotation about a vertical axis and for tilting movement relative to said base about transverse and longitudinal axes, a parallel motion arm structure pivotally mounted on said support to swing relative thereto,

a cutter head mounted on the outer extremity of said arm structure for rotation relative thereto, and a kerf cutter pivotally mounted on said cutter head and adjustable therewith about the head axis into horizontal and vertical cutting positions.

22. In a mining apparatus, a portable base. a horizontal turntable mounted on said base for rotation about a vertical axis and for tilting movement relative to said base about transverse and longitudinal axes, said turntable having a frame overhanging the forward end of said base, an arm structure pivotally mounted on said overhanging frame to swing relative to the turntable about an axis in advance of the forward end of the base, a cutter head rotatably mounted on the outer extremity of said arm structure, and a kerf cutter pivotally mounted on said cutter head and adjustable therewith about the head axis into horizontal and vertical cutting positions.

23. In a mining apparatus, a portable base, a support mounted on said base for tilting movement relative thereto about horizontal transverse and longitudinal axes, an arm structure pivotally mounted upon a substantially horizontal axis on the'forward end of said support for swinging movement relative thereto, .a cutter head rotatably mounted on the outer extremity of said arm structure, and a kerf cutter pivotally mounted on said cutter head to swing relative to the latter.

24. In a mining'apparatus, a portable base, a support mounted on said base for tilting movement relative thereto about transverse and longitudinal axes, an arm structure pivotally mounted to swing in a vertical direction relative thereto, and a cutter head rotatably mounted on the outer extremity of said arm structure for rotation on an axis normally extending longitudinally of the base.

25. In a mining apparatus, a portable base, a support mounted on said base for tilting movement relative thereto about horizontal transverse and longitudinal axes, an arm structure pivotally mounted to swing in a vertical direction relative thereto, a cutter head rotatably mounted on the outer extremity of said arm structure, and a kerf cutter pivotally mounted on said cutter head and bodily movable on rotation of said head on its axis into different cutting planes.

26. In a mining apparatus, a portable base, a support mounted on said base for tilting movement relative thereto about horizontal transverse and longitudinal axes, a parallel motion arm structure pivotally mounted on the forward end of said support for swinging movement relative thereto, a cutter head rotatably mounted on the outer extremity of said arm structure, and a kerf cutter pivotally mounted on said cutter head.

27. In a mining apparatus, a portable base, a support mounted on said base for universal tilting movement relative thereto, an arm structure pivotally mounted upon a substantially horizontal transverse axis on the forward end of saidsupport to swing relative thereto, a cutter head rotatably mounted on the outer extremity of said arm structure, and a kerf cutter pivotally mounted on said cutter head. V

28. In a mining apparatus, a portable base, a horizontal turntable mounted on said base for rotation about a vertical axis and for universal tilting movement relative to the horizontal, said turntable being adjustable in a vertical direction relative to said base, an arm structure pivotally mounted on said turntable and adjustable therewith and swingable in vertical 'planes relative thereto, and kerf cutting mechanism carried at the outer extremity of said arm structure and'adjustable relative thereto into horizontal and vertical cutting positions.

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

horizontal turntable mounted on said base for rotation about .a vertical axis and for universal tilting movement relative thereto, said turntable being adjustable in a vertical direction relative to said base, an arm structure pivotally mounted upon a'substantially horizontal axis on said turntable and overhanging said base, said arm structure being swingable relative to and with said turntable, and kerf cutting mechanism carried at the outer extremity of said arm structure and including a cutter head rotatable relative to said arm structure about a horizontal axis, and a kerf cutter pivotally mounted on said cutter head and rotatable with said head about the head axis into horizontal and vertical cutting positions.

so. In a mining apparatus, a portable base, a horizontal'turntable mounted on said base for rotation about a vertical axis and for universal tilting movement relative thereto, said turntable being adjustable in a vertical direction relative to said base, a cutter head mounted on said turntable for rotation relative thereto about an axis extending radially from the turntable axis and said cutter head being adjustable in a vertical direction relative to said turntable, and a kerr cutter pivotally mounted on said cutter head and adjustable therewith about the head axis into horizontal and vertical cutting positions.

31. In a mining apparatus, a portable base. a horizontal turntable mounted on said base for rotation about a vertical axis and for universal tilting movement relative to the horizontal, a cutter head mounted on said turntable for rotation relative thereto and for adjustment in a Vertical direction relative to the turntable, means for always maintaining said head axis parallel to a common straight line during aforesaid adjustment of said head relative to said turntable, and a kerf cutter pivotally mounted on said cutter head and adjustable'therewith about the head axis into horizontal and vertical cutting positions.

32. In a mining apparatus, a portable base, a horizontal turntable mounted on said base for rotation about a vertical axis, a swingable arm pivotally mounted on said turntable to swing in a vertical direction relative thereto about a horizontal axis located in advance of the forward end of the base, a cutter head rotatably mounted on the outer 'extremityof said arm and adjustable with said arm in a vertical direction relative to said turntable, and a kerf cutter pivotally mounted on said cutter head and adjustable therewith about the head axis into horizontal and vertical cutting positions.

33. In a mining apparatus, a portable base, a horizontal turntable mounted on said base for adjustment into different. elevated positions relative thereto, an arm structure pivotally mounted on said turntable to swing in a vertical direction relative thereto, and a kerf cutter carried at the outer extremity of said arm structure and adjustable relative to said arm structure into horizontal and vertical cutting positions, said arm structure being swingable to move said kerf cutter into parallel horizontal planes.

.734. In a mining apparatus, a portable base, an arm structure pivotally mounted on said base to swing horizontally and vertically relative thereto, a cutter head rotatably mounted on the outer extremity of said arm structure, and a kerf cutter pivotally mounted on said cutter head and adjustable therewith into any desired position completely about the head axis, said head axis at all'tim'es remaining parallel'to a common straight line during swinging of said arm structure in a vertical direction relative to said base.

35. In a mining apparatus, a portable base, a'support mounted on said base for tilting movement relative thereto about a. horizontal axis, said support being adjustable in'a vertical direction relative to said base, an arm structure pivotally mounted upon a substantially horizontal axis on the forward end of said support for swinging movement relative thereto, a cutter head rotatably mounted on, the outer extremity of said arm structure, and a lrerf cutter pivotally mounted on said cutter head and adjustable therewith about the head axis into horizontal and vertical cutting positions.

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

support mounted on said base for tilting move ment relative thereto about a horizontal axis, an arm structure pivotally mountedupon a substantially horizontal axis on the forward end of said support for swinging movement relative thereto, said arm structure being adjustable horizontally relative to said base, a cutter head rotatably mounted on the other extremity of said arm structure, and a kerf cutter pivotally mounted on said cutter head.

37. In a mining apparatus, a portable base, a support mounted on said base for tilting movement relative thereto about a horizontal axis, an arm structure pivotally mounted to swing in a vertical direction relative to said support about an axis extending transversely of the base at the forward end, thereof, said arm structure being swingable bodily horizontally relative to said base, and a cutter head rotatably mounted on the outer extremity of said arm structure.

38. In a mining apparatus, a wheel supported frame adapted to run along a mine trackwa-y and mounted for tilting movement relative to the horizontal, a parallel link supporting structure pivotally mounted on said tiltable frame for swinging movement relative thereto, a cutter head rotatably mounted on the outer extremity of said supporting structure, and a keri cutter pivotally mounted on said cutter head and ad'- justable with said head about the head axis into different cutting positions.

39. In a mining apparatus, a wheel supported frame adapted to run along a mine trackway and mounted for tilting movement relative to the horizontal, a parallel link supporting structure pivotally mounted on said tiltable frame for swinging movement in both horizontal and vertical directions, a cutter head rotatably mounted on the outer extremity of said supporting structure, and a kerf cutter pivotally mounted on said cutter head and adjustable with said head about the head axis into different cutting positions.

40. In a mining apparatus, a wheel supported frame adapted to run along a mine trackway and mounted for tilting. movement relative to the horizontal, an arm structure pivotally mounted on the forward end of said frame to swing in a vertical direction relative thereto about a horizontal axis located in advance of said frame, a cutter head rotatably mounted on the outer extremity of said supporting structure to rotate through 360, and a kerf cutter pivotally mounted on said cutter head and adjustable with said head about the head axis'into different cutting positions.

41. In a mining apparatus, a portable base, a horizontal turntable mounted on said base for rotation about a vertical axis and for universal tilting movement relative to the horizontal, a swingable supporting structure pivotally'mounted on said turntable and adjustable therewith and swingable upwardly and downwardly relative thereto, kerf cutting mechanism carried at the outer extremity of said supporting structure and including a horizontally extending kerf cutter adjustable relative thereto into horizontal and vertical cutting positions, and means for always maintaining said lzerf cutter in a hori zontal position during swinging of said supporting structure relative to said turntable.

42. In a mining apparatus, a portable base, a horizontal turntable mounted on said base for rotation about a vertical axis and for universal tilting movement relative to the horizontal, a swin able supporting structure pivotally mounted on said turntable to swing about a horizontal axis and overhanging said base, kerf cutting mechanism carried at the outer extremity of said supporting structure and including a cutter head rotatable relative to said supporting structure about a horizontal axis, a kerf. cutter pivotally mounted on said. cutter head, and means for always maintaining the cutter head axis parallel to a common straight line during swinging of said supporting structure relative to said turntable.

43. In a m"ning apparatus, a portable base, a horizontal turntable on said base, an arm structure pivotally mounted on said turntable to swing vertically relative thereto about a horizontal transversely extending axis located in advance of said base, said arm structure extending outwardly from the forward edge of said turntable a substantial distance-in advance of said base, a cutter head rotatably mounted on the outer overhanging extremity of said arm str" cture, a kerf cutter pivotally mounted on said cutter head to swing relative thereto and adjustable with said head about the head relative to said arm structure into horizontal and vertical cutt ng po-- sitions, means for rotatingsaid turntable to move the arm structure and cutter head laterally relative to said base, and means for swinging said arm structure vertically relative to said turntable to vary the elevation of the cutter head with respect to said base.

44. In a mining. apparatus, a wheel supported base adapted to run along a mine trackway, a horizontal turntable on said base, an arm structure pivotally'mounted on said turntable to swing vertically relative thereto about a horizontal transversely extending axis located in advance of the front wheel axes, said arm structure extending outwardly from the forward edge of said turntable a substantial distance in advance of said base, a cutter head rotatably mounted on the outer overhanging extremity of said arm structure, a kerf cutter pivotally mounted on said' cutter head to swing relative thereto and adjustable with said head about the head axis relative to said arm structure into-horizontal and vertical cutting positions, means for rotating said turntable to move the arm structure and cutter head laterally relative to said base, and means for swinging said arm structure vertically relative to said turntable to vary the elevation of the cutter head with respect to said base.

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

horizontal turntable on said base, an arm structure pivotally mounted on said turntable at the forward end of said base to swing in a vertical direction relative thereto about a horizontal axis extending transversely of said turntable, and a kerf cutter mounted on the outer extremity of said arm structure and adjustable relative thereto into horizontal and vertical cutting positions, said arm structure having a range of swinging movement about said transverse horizontal axis sufdcient to position said kerf cutter, solely by swinging movement about said transverse horizontal axis, optionally in a horizontal position substantially on the mine floor or in a position wholly above a horizontal plane including said transverse horizontal axis.

46. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm structure pivotally mounted on said turntable at the forward end of said base to swing in a vertical direction relative thereto about a horizontal axis extending transversely of said turntable, a cutter head mounted on the outer extremity of said arm 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 arm structure into horizontal and vertical cutting positions, said arm structure having a range of swinging movement about said transverse horizontal axis sufficient to position said kerf cutter, solely by swinging movement about said transverse horizontal axis, optionally in a horizontal position substantially on the mine floor or in a position wholly above a horizontal plane including said transverse horizontal axis.

47. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm structure pivotally mounted on said turntable to swing relative thereto, a frame supported on the outer extremity of said arm structure and to which said arm structure is pivotally connected upon an axis perpendicular to the planes of swinging movement of said arm structure, said arm structure moving angularly about said pivotal connection with said frame upon swinging movement of said arm structure relative to said turntable, a cutter head mounted on said frame for rotation relative thereto about a horizontal axis, a kerf cutter pivotally mounted on said cutter head for swinging movement relative thereto, and motor operated devices for rotating said cutter head about its axis and for swinging said kerf cutter about its pivot.

48. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm structure pivotally mounted on said turntable to swing relative thereto, a frame supported on the outer extremity of said arm structure and to which said arm structure is pivotally connected upon an axis perpendicular to the planes of swinging movement of said arm structure, said arm structure moving angularly about said pivotal connection with said frame upon swinging movement of said arm structure relative to said turntable, a cutter head mounted on said frame for rotation relative thereto about a horizontal axis, a kerf cutter pivotally mounted on said cutter head for swinging movement relative thereto, motor operated devices for rotating said cutter head about its axis and for swinging said kerf cutter about its pivot, and motor operated means for swinging said arm structure relative to said base.

49. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm structure pivotally mounted on said turntable for swinging movement relative thereto, said arm structure extending longitudinally in advance of said base, a support to which the outer extremity of said arm structure is pivotally connected on an axis parallel with'the arm structure axis, a cutter mounted on said support for rotation relative thereto about an axis extending perpendicularly to said support axis, and a kerf cutter pivotally mounted on said cutter head for swinging movement relative thereto about an axis at right angles tothe head axis, said kerf cutter being disposable, by head rotation exclusively, to out parallel horizontal and parallel vertical kerfs.

50. In a mining apparatus, a portable base, a horizontal turntable mounted on said base, a frame on said turntable having a horizontal portion projecting outwardly from the forward edge of said turntable, said projecting frame portion overlying the front end of said base and having its forward extremity overhanging said base, an elongated arm pivotally mounted on said projecting frame portion to swing about a horizontal axis located in advance of said base, a support rotatably mounted on the outer extremity of said arm, and a kerf cutter carried by said support and rotatable with the latter about the support axis relative to said arm into horizontal and vertical cutting positions.

51. In a mining apparatus, a portable base, a horizontal turntable mounted on said base, a frame on said turntable having a horizontal portion projecting outwardly from the forward edge of said turntable, said projecting frame portion overlying the front end of said base and having its forward extremity overhanging said base, an elongated arm pivotally mounted on said projecting frame portion to swing about a horizontal axis located in advance of said base, a support rotatably mounted on the outer extremity of said arm, a kerf cutter carried by said support and rotatable with the latter about the support axisrelative to said arm into horizontal and vertical cutting positions, means for swinging said arm in a vertical direction about its pivot relative to said turntable to swing said kerf cutter in vertical planes, and means for rotating said turntable relative to said base to swing said kerf cutter in horizontal planes.

52. In a mining apparatus, a portable base, a horizontal turntable mounted on said base, a frame on said turntable having a horizontal portion projecting outwardly from the forward edge of said turntable, said projecting frame portion overlying the front end of the base and having its forward extremity overhanging said base,

.an elongated arm pivotally mounted on said projecting frame portion to swing about a horizontal axis located in advance of said base, a support pivotally connected to the outerextremity of said arm, said arm moving angularly about its pivot with said support with respect to the latter as said arm is swung about said horizontal pivotal axis, a cutter head rotatably mounted on said support, and a kerf cutter carried by said cutter head and rotatable with said head about the head axis relative to said arm into horizontal and vertical cutting positions.

CHARLES F. OSGOOD.

CERTIFICATE OF CORRECTIQN.

Patent No. 2,007,905. M 9, 1935.

CHARLES F. OSGGOD.

it is hereby certified that enter appears in the printed specitiestien of the sleeve numbered patent requiring eorreetitm as follows: Page 8, seeped eelumn, line 35, claim R7, or "adjsument" read adjustment; page 9, lines 23, 42: and 52, claims 23, 25 and 26 respectively, strike out the wercl "herizemal"; page 10, first column, line 38, claim 37, after "end" strike out the seams; and page ll, second column, line 9, claim 49, after "cutter" insert the were; head; and that the said Letters Patent should be read with these sensations therein that the same may conierm to the record or; the case in the Pat-em. fiiiies.

Signed and sealed this 13th day of August, A. D. 1935.

Leslie Frazer (Seal) Acting (lemmisswner oi Patents.