US2031376A - Mining machine - Google Patents

Description

f mamy@ F- A. LINDGREN MNING MACHINE original Filed April, 1950 2 sheetsushee,c l

Feb- 18, 1936- F. A. LINDGRN 2,133,1,37`

MINING MACHINE Original Filed April 2, 1930 2 Sheets-Sheet 2 Patented Feb. 18, 1936 UNITED STATES PATENT OFFICE 2,031,376 MINING MACHINE Application April 2, 1930, serial No. 441,085 Renewed April 7, 1934 35 Claims.

This invention relates to improvements in mining machines and more particularly to a truck mounted type of coal mining machine adapted to cut an arcuate kerf in a mine wall at various elevations with respect to a mine bottom.

My invention has as a principal object to provide a machine of simple and rugged construction suitable foruse in narrow entries which is of a short wheel-base and length so as to be able to negotiate sharp turns and which is provided with power actuated means for folding the cutter bar backward along the machine frame when travelling about the mine. Another object of my invention is to provide a machine of a compact rugged construction which is adjustable to cut a kerf at various elevations with respect to the mine bottom, and which may cut a kerf in the mine wall adjacent the mine roof. Another object of my inventio-n is to provide a plural speed frictionally controlled power operated mechanism.

in section to more clearly show certain details ofV my invention;

Figure 3 is a partial enlarged fragmentary sectional view taken on line 3 3 of Figure 1;

Figure 4 is a partial enlarged fragmentary sectional view taken on line 4 4 of Figure 1;

Figure 5 is an enlarged partial sectional view taken on line 5 5 of Figure 1; and

Figure 6 is an enlarged detail view of the frictionally controlled power transmission mechanism with parts broken away and in section to more clearly show certain details of my invention.

Like numerals refer to like parts throughout the various figures.

Referring now in particular to the drawings, the embodiment of my invention illustrated includes a truck I0 supported on wheels II and axles I2 having a cutting element I3 supported thereon for vertical movement with respect thereto.

The cutting element I3 is supported on the truck IU in vertically extending guides I 4 I 4 on opposite sides thereof and comprises a motor I5, a cutter bar supporting section I6 forwardly of said motor having a cutter bar I'I supported thereon for pivotal movement with respect thereto, and an elevating and feeding section I8 rearwardly of said motor.

The guides I4 I4 are spaced in parallel relation with respect to each other on opposite sides of the truck Il) and have vertically disposed racks 20, 20 on opposite ends thereof. Y'Ihe racks 26, 20are engaged by pinions 2| 2I keyed on opposite ends of transverse shafts 22-22 disposed on opposite ends of the motor I5 and journaled in bearing supports 23 23 integral with the frame of the motor I5.

The bearing supports 23 yenclose the pinions 2| and abut the outer face of the guides I4 and serve as a means for guiding the cutting element I3 as it is vertically moved in the guides I4.

A shaft 25 extends longitudinally of the motor I5 on one side thereof and has a plurality of worms 26-26 thereon disposed adjacent opposite ends of the motor I5. The worms 26 are of the self-locking type and mesh with and drive Worm gears 21 keyed on respective ends of the shafts 22 for rotating said shafts simultaneously and thus raising or lowering the cutting element I3 in the guides I4. A spur gear 29 is freely mounted on the shaft 25 near the rearward end thereof and is selectively connectible therewith by means of suitable clutch mechanism` which may be of any well known type but which is herein shown as a jaw clutch 3D. 'Ihe spur gear 29 is rotated by means of a spur gear 3| freely mounted on a sleeve 32l and driven from the motor I5 at a plurality of frictionally controlled speeds by means of a frictionally controlled plural speed planetary reduction device generally indicated at 33.

The planetary speed reduction device 33 is of a usual construction so will only be described in so far'as is necessary to fully disclose my present invention and is adapted for complete variation in speed under the control of a friction band 34 operated by a suitable system of levers (not shown) and is driven from the motor I5 by means of a motor pinion 35'and spur gear 36 keyed on the sleeve 32.

A sun gear 31 is integral with the inner end of the sleeve 32 and meshes with and drives planetary pinions 38, which pinions mesh with an internal gear 39 controlled by the friction band 34. Planetary pinions 40 are disposed adjacent to and integral with the planetary pinions 38 and mesh IISy with and drive an internal gear 4| adjacent the internal gear 39, and a spur gear 42 integral with a sleeve 43.

Clutch jaws 44 are integral with the internal gear 4| and are connectible with the spur gear 3| for driving said gear at one speed, while clutch jaws 45 are integral with a member 46 fixed on the sleeve 43 and are connectible with the spur gear 3| for driving said spur gear at a lower speed. Clutch jaws 41 extend radially inward from a clutch collar 48, which clutch collar is operatively connected with the spur gear 3|. Said clutch jaws are provided to connect the jaws 44 or 45 with the spur gear 3|. The clutch collar 48 is shifted by a suitable system of levers of an ordinary construction.

Thus the gear 3| may be driven at a high or low speed, each of which speeds are controlled by the pressure of the friction band 34 on the outer periphery of the internal gear 39, which friction band also acts as a safety device upon overload of the feeding or driving mechanism.

It may thus be seen that the cutting element I3 may be raised or lowered in the guides I4 at a plurality of frictionally controlled speeds and that said cutting element may be locked in any position on the guides I4 by means of the self-locking worms 26 and worm gears 21.

Referring now in particular to the cutting mechanism and cutter bar supporting section I6, a cutter chain 50 is movable about the cutter bar I1 in a usual manner and is selectively driven from the forward end of the motor I by a bevel motor pinion 5I, bevel gea-r 52 xed on a spider 53, jaw clutch 54, vertical shaft 55, and cutter chain sprocket 56.

The spider 53 of the bevel gear 52 is journaled on the outer periphery of a hub 51 of a cutter bar supporting member 58, while the vertical shaft 55 is journaled within said hub. The cutter bar supporting member 58 is supported in the cutter bar supporting section I6 for pivotal movement with respect thereto about the axis of the vertical shaft 55. The cutter bar supporting member 58 is provided with an outwardly extending upper section 59, the outer periphery of which is circular and abuts the inner periphery of the cutter bar supporting section I6. A shoulder 6D extends n inwardly from the cutter bar supporting section I6 and serves to support the outwardly extending upper section 59 of the cutter bar supporting member 58. A ring 6I abuts the top portion of the outwardly extending upper section 59 of the cutter bar supporting member 58 and is fixed to the cutter bar supporting section I 6 to prevent vertical movement of said cutter bar supporting member with respect to the cutter bar supporting section I6.

A flange 62 depends from the outwardly extending upper section 59 of the cutter bar supporting member 58 and has a worm gear 63 keyed thereon. A worm 64 is fixed on a longitudinal shaft 65 and meshes with and drives the worm gear 63 which in turn moves the cutter bar I1 about the axis of the vertical shaft 55. The longitudinal shaft 65 is journaled at its forward end in a housing 66 for the worm 64 and has its rearward end journaled in a bearing support 61 extending outwardly from the feeding and elevating section I8. A spur gear 68 is journaled on its hub in a bearing support 69 extending outwardly from the feeding and elevating section I8 and is freely mounted on the longitudinal shaft 65 for rotatable movement with respect thereto. Suitable clutch means are provided for driving the longitudinal shaft 65 from the spur gear 68, which means herein comprise a clutch collar feathered on the longitudinal shaft 65 having clutch jaws 1I thereon engageable with clutch jaws 12 integral with the rearward face of the spur gear 68.

The spur gear 58 is driven by a spur gear 13 keyed on the end of a longitudinal shaft 14, which gear is in turn driven by the spur gear 3| through the frictionally controlled plural speed planetary reduction device 33 hereinbefore described.

Thus the cutter bar I1 may be pivotally moved about the axis of the vertical shaft 55 by the motor I5 at a plurality of predetermined frictionally controlled speeds. This provides a power actuated means for sumping the cutter bar into the coal, which means is frictionally controlled to compensate for hard spots in the coal and to prevent breakage of the cutting mechanism when boulders or sulphur balls are encountered in the coal.

It may be seen that the cutter bar I1 may be rotated 360 degrees. Thus the cutter bar may be moved in a position on the machine frame so it extends rearwardly along the machine frame when travelling about the mine as is shown by dotted lines in Figure 2. This materially shortens the travelling length of the mining machine and makes it possible to negotiate sharp turns and travel in narrow entries or into rooms where the props are closely spaced.

Power actuated means are provided for mo'ving the mining machine about the mine on the wheels I I, which herein comprise a worm cut integral with the shaft 14, which shaft is driven from the motor I 5 through the planetary geared reduction device 33, spur gear 3|, and spur gear 13 xed to said shaft. The worm 15 drives a worm gear 16 on a vertical shaft 11. A squared socket 18 is provided on the lower end of the vertical shaft 11, which socket is engaged by a squared end of an adjacent vertical shaft 19. The vertical shaft 19 has a bevel pinion 80 xed thereon, which bevel pinion meshes with and drives bevel pinions 8|-8I on opposite sides thereof and is freely mounted on a transverse shaft 82. Suitable clutch means are provided to operatively connect either of the bevel pinions 8| with the transverse shaft 82 which herein comprise a clutch collar 83 feathered on the transverse shaft 82 having clutch jaws on each end thereof selectively connectible with corresponding clutch jaws on the inner face of each of the bevel pinions 8| so as to drive the shaft 82 in opposite directions without reversal of the motor I5. A sprocket 84 is keyed on the transverse shaft 82 and has driving connection with the rearward axle I2 and wheels I I by means of a drive chain 85 and driven sprocket 85 on the rearward axle I2. The forward and rearward axles I2 are operatively connected together by means of a suitable chain and sprocket drive generally indicated at 81.

The mining machine may thus be moved about the mine on the wheels I I at a plurality of frictionally controlled speeds which include a relatively fast frictionally controlled travelling speed, and a slow frictionally controlled sumping speed for feeding the cutter bar into the coal.

A feed drum 88 has been provided to aid the Wheels I I in feeding the cutter bar into the coal when necessary; as, for instance, when the cutting is harder than is ordinarily encountered. This feed drum is driven from the vertical shaft 11 by means of a spur pinion 89 and a suitable geared reduction not herein shown since it is no part of my invention, and is thus rotatable at a plurality of frictionally controlled speeds through the planetary gearedy speed reduction device in the same manner the wheels Il are driven and controlled by said planetary geared speed reduction device. A

It may now be seen that a mining machine has been provided which is of a simple and rugged construction and is suitable for use in narrow-entries, that this machine is vertically adjustable for cutting at various elevations withY respect to the mine bottom, that the cutter bar may be moved about a vertical axis by power mechanism actuated by the motor I for arcuately feeding the cutter bar into the-coal `and Vthat the cutter bar may be folded backwardly along the machine frame when travelling `about the mine, and that said mining machine may be moved about the mine by means of a drive mechanism actuated by the motor `I 5 and that all of these above mentio'ned movements and operations are controlled by means of a single frictionally controlled plural speed planetary geared reduction device..

While I have herein shown and described one form in which my invention may be embodied it will be understood that the construction and arrangement of the various parts may be altered or changed without departing from the spirit and scope thereof. Moreover, I do not wish to be construed as limiting myself to the particular or identical construction illustrated excepting as it may be specifically limited in the appended claims. Y

I claim as my invention:

1. In a mining machine, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, a cutter bar carried forwardly of said motor for pivotal movement about a vertical axis, feeding and elevating mechanism disposed rearwardly of said motor including gear reduction mechanism driven from the rearward end of said motor, and a drive connection from said gear reduction mechanism to said cutter bar for pivotally moving said cutter bar about a vertical axis comprising a shaft extending longitudinally of said motor and having driving connection with said cutter bar.

2. Ina mining machine, a wheeled truck, a cutting element supported thereon for vertical movement with respectrthereto including a `mo tor, a cutter bar carried forwardly of said motor for pivotal movement about a verticalv axis, feeding and elevating mechanism disposed rearwardly of said motor including gear reduction mechanism driven from the rearwardend of said motor, and a drive connection from said gear reduction mechanism to said cutter bar for pivotallyv moving said cutter bar about a verticalaxis comprising a shaft extending longitudinally of said motor, a selective connection between said shaft and gear reduction mechanism, and a geared connection between said shaft and cutter bar.

3. In a mining machine, a wheeled truck, a cuttingY element supported thereon for vertical movement with respect thereto including a moto'r, a cutter bar carried forwardly of said motor for pivotal movement about a vertical axis, feeding and elevating mechanism disposed rearwardly of said motor including gear reduction mechanism driven from the rearward end of said Vmotor, and a drive connection from said gear reduction mechanism to said cutter bar for pivotally moving said cutter bar about a vertical axis comprising a longitudinal shaft extendingalong one side of said-motor, a selective connectionfbetween said shaft and gear reduction mechanism and a geared connection between said shaft and cutter bar. Y

4. In la mining machine, a Vwheeled truck, a cutting element supportedA thereon for vertical movement with respect thereto including a motor, a cutter bar carried forwardly of said motor for pivotal movement about a vertical axis, feeding and elevating mechanism disposed rearwardly of said motor including gearY reduction mechanism driven from the rearward end of said motor, and adrive connection from said gear reduction mechanism to said cutter bar for pivotally moving said cutter bar about a vertical axis comprising a shaft extending longitudinally of said fmotor, a selective connection between said shaft and gear reduction mechanism, and a geared connection between'said shaft and cutter bar comprising a worm gear coaxial 'with the axis yof pivotal movement of said cutter bar and a Worm meshing with said worm gear.

5. In a track mounted mining machine, a wheeled truck, a cutting element supported on said truck for vertical movement with respect thereto including a motor, a cutter bar supported forwardly of said motor for rotatable movement about a vertical axis, means driven by said motor for rotatably moving said cutter bar, and elevating mechanism for said cutting element comprising a-plurality of racks supported on said truck, a plurality o'f pinions journaled on said cutting element and meshing with said racks, and a drive connection from said motor to said pinions comprising reduction gearing driven from the rearward end of said motor, a shaft extending longitudinally of said motor and selectively driven therefrom and a drive connection from said shaft to said pinions comprising a plurality of worm and Worm gears.

6. In a track mounted mining machine, a wheeled truck, a cutting element supported on said truck for vertical mo'vement with respect thereto including a motor, a cutter bar supported forwardly of said motor for rotatable movement about a vertical axis, and feeding and elevating mechanism therefor comprising a plural speed planetary gear reduction device, means for operatively connecting said plural speed planetary gear reduction device with said cutter bar for rotating said cutter bar, a plurality of parallel spaced racks on said truck, a plurality of pinions mounted on said cutting element meshing with said racks, and a geared connection from said planetary gear reduction device toi said pinions for driving said pinions.

' 7. In a mining machine, a wheeled truck, a motor thereon, a cutter bar having a cutter chain guided for orbital movement thereabout carried forwardly of said motor for pivotal movement with respect 'thereto about a vertical axis withinV the orbital path of said cutter chain, means driven from theforward end of said motor for driving said chain about said cutter bar and a geared drive connection from the rearward end of said motor for pivoting said cutter bar at a feeding v speed and selectively driving said truck including plural speed reduction gearing, a drive connection'from said reduction gearing for driving said truck and a shaft extending longitudinally along said motor, driven by said reduction gearing and having driving connection with said cutter bar.

8. In a mining machine, a wheeled truck, a motor thereon, a cutter bar having a cutter chain guidedfor orbital movement thereabout carried forwardly of said motor for pivotal movement with respect thereto about a vertical axis within the orbital path of said cutter chain, means driven from the forward end of said motor for driving said chain about said cutter bar and a geared drive connection from the rearward end of said motor for pivoting said cutter bar at a feeding speed and selectively driving said truck including a planetary geared reduction device disposed rearwardly of said motor, a drive connection from said planetary to said truck, and another drive connection from said planetary to said cutter bar including a longitudinal shaft extending along said motor.

9. In a mining machine, a motor, a cutter bar having a cutter chain guided for orbital movement thereabout carried forwardly of said motor for pivotal movement with respect thereto about a vertical axis within the orbital path of said cutter chain, means driven from the forward end of said motor for driving said chain about said cutter bar and a geared drive connection from the rearward end of said motor for pivoting said cutter bar at a feeding speed including a planetary geared reduction device disposed rearwardly of said motor, a shaft driven thereby and disposed to one side of said motor, and a geared connection from the forward end of said shaft to said cutter bar.

10. In a mining machine of the class described, a truck supported on wheels and axles, a plurality of guides extending upwardly from said truck, a cutting element supported on said guides for vertical movement therealong, said cutting element including a motor, a projecting cutter bar disposed forwardly of said motor and having a cutter chain orbitally movable thereabout, said cutter bar being pivotally movable about a vertical axis, and plural speed means driven by said motor for pivotally moving said cutter bar, elevating said cutting element in said guides and moving said truck on said wheels and axles including reduction gearing driven by said motor, a drive connection from said reduction gearing for pivoting said cutter bar at a feeding speed, another drive connection from said reduction gearing for elevating said cutting element in said guides, and a third drive connection from said reduction gearing for moving said truck on said wheels and axles.

11. In a mining machine of the class described, a truck supported on wheels and axles, a plurality of guides extending upwardly from said truck, a cutting element supported on said guides for vertical movement therealong, said cutting element including a motor, a projecting cutter bar disposed forwardly of said motor and having a cutter chain orbitally movable thereabout, said cutter bar being pivotally movable about a vertical axis, and plural speed means driven by said motor for pivotally moving said cutter bar, elevating said cutting element in said guides and moving said truck on said wheels and axles including reduction gearing driven by said motor, a drive connection from said reduction gearing for elevating said cutting element in saidguides, another drive connection from said reduction gearing for moving said truck on said wheels and axles, and a third drive connection from said reduction gearing for pivoting said cutter bar at a feeding speed including a shaft extending longitudinally of said motor and disposed to one side thereof.

12. In a mining machine of the class described, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, a cutter bar supporting section forwardly of said motor, a cutter bar supported on said cutter bar supporting section for rotatable movement about a vertical axis, a plural speed planetary gear reduction device driven from said motor and a geared connection from said planetary gear reduction device to said cutter bar for rotating said cutter bar about said vertical axis including a worm gear coaxial with the axis of pivotal movement of said cutter bar and a Worm meshing therewith.

13. In a mining machine of the class described, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, a cutter bar supporting section forwardly of said motor, a cutter bar supported on said cutter bar supporting section for rotatable movement about a vertical axis, and plural speed means driven from said motor for rotating said cutter bar about said vertical axis including a planetary gear speed reduction device connectible with the rearward end of said motor and a geared connection from said planetary gear reduction device to said cutter bar.

14. In a mining machine of the class described, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, a cutter bar supporting section forwardly of said motor, a cutter bar supported on said cutter bar supporting section for rotatable movement about a vertical axis, and plural speed means driven from said motor for rotating said cutter bar about said vertical axis including a frictionally controlled planetary gear speed reduction device connectible with the rearward end of said motor and a geared connection from said planetary gear reduction device to said cutter bar.

15. In a mining machine of the class described, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, a cutter bar supporting section forwardly of said motor, a cutter bar supported on said cutter bar supporting section for rotatable movement about a vertical axis, and plural speed means driven from said motor for rotating said cutter bar about said vertical axis including a shaft extending longitudinally of said cutting element beyond the forward and rearward extremities of said motor and a planetary geared speed reduction device for connecting the rearward end of said shaft with said motor.

16. In a mining machine of the class described, a wheeled truck, a cutting element supported thereon for vertical movement with respect thereto including a motor, a cutter bar supporting section forwardly of said motor, a cutter bar supported on said cutter bar supporting section for rotatable movement about a vertical axis, and frictionally controlled plural speed means driven from said motor for rotating said cutter bar about said vertical axis and folding said cutter bar rearwardly along said cutting element comprising a shaft extending longitudinally of said cutting element beyond the forward and rearward extremities of said motor, and a frictionally controlled planetary geared speed reduction device for connecting the rearward end of said shaft with said motor.

17. In a mining machine of the class described, a truck, wheels and axles for supporting said truck for movement about a mine, guides extending vertcally upward from said truck. a cutporting section for rotatable movement about a Vertical axis, plural speed means driven from the rearward end of said motor for rotating said cutter-bar about said vertical axis including a shaft extending longitudinally of said cutting elej ment beyond the forward and rearward extremities of said motor, plural speed means driven from the rearward end of said motor for moving said cutting element vertically in said guides including a shaft parallel with said first men- 'tioned shaft, and a planetary geared speed reduction device having operative connection with said iirst and second mentioned shafts.

18. In a mining machine of the class described, a truck, wheels and axles for supporting said truck for movement about a mine, guides extending vertically upward from said truck, a cutting element supported in said guides for vertical movement therealong'including a motor, a cutter bar supporting section forwardly of said motor, a cutter bar supported on said cutter bar supporting section for rotatable movement about a vertical axis, plural speed means driven from the rearward end of said motor for rotating said cutter bar about said vertical axis including a shaft extending longitudinally of said cutting element on one side thereof beyond the forward and rearward'extremities of said motor, plural speed means driven from the rearward end of said motor for moving said cutting element vertically in said guides Vincluding a second shaft parallel with'said first 'mentioned shaftand on the opposite side'of` said machine from said first mentioned shaft.

19; In a'mining machine of the class described,

.101 a truck; wheelsV 'and1ax'les for supporting said bar supporting section forwardly of said motor,

avcutterbar supported on said cutter bar supporting section for rotatable movement about a vertical;V axis, plural speed means' driven from the rearward end of said motor for rotating said cutter bar about said vertical axis including a shaft extending longitudinally of said cutting element on one side thereof beyond the forward and rearward extremities of said motor, plural speed means driven from the rearward end of said motor for moving said cutting element vertically in said guides including a second shaft parallel with said first mentioned shaft and on the opposite side'of said machine from said first mentioned shaft and a planetary geared speed reduction'device having operative connection with said first and secondmentioned shafts.

20. YIn a mining lmachine of the class described,

a truck, wheels and axles for supporting said truck for movement about a mine, guides extending vertically upward from said truck, a cutting element supported in said guides for vertical movement therealong including a motor, a cutter bar supporting section forwardly of said motor, a cutter bar supported on said cutter bar supporting section for rotatable movement about a vertical axis, a frictionally controlled plural speed planetary geared reduction device disposed rearwardly of said motor and driven from the rear# ward end thereof, a shaft extending longitudinally of said cutting element beyond the forward and rearward extremities of said motor and having its forward end operatively connected with said cutter bar for rotating said cutter bar about said vertical pivotal axis, a second shaft parallel with said first mentioned shaft having operative connection with said vertical guides for vertically moving said cutting element in said guides, and means for driving each of said shafts from said frictionally controlled plural speed planetary geared reduction device for rotating said cutter bar or vertically moving said cutting element at` a plurality of frictionally controlled predetermined speeds.

21. In a mining machine of the class described, a truck, wheels and axles for supporting said truck for movement about a mine, guides extending vertically upward from said truck, a cutting element supported in said guides for vertical movement therealong including a motor, a cutter bar supporting section forwardly of said motor, a cutter bar supported on said cutter bar supporting section for rotatable movement about a vertical axis, a frictionally controlled pluralspeed planetary geared reduction device disposed rearwardly of said motor and driven from the rearward end thereof, a shaft extending longitudinally of said cutting element on one side thereof beyond the forward and rearward extremities of `said motor and having its forward end operatively connected with said cutter bar for rotating said cutter bar about said vertical pivotal axis, a second shaft parallel with said iirst mentioned shaft and on the opposite side of said motor from said' first mentioned shaft having operative connection with said vertical guides for raising or lowering said cutting element in said guides, and means for independ-l ently driving either of `said shafts from said f rictionally controlled plural speed planetary geared reduction device for rotating saidcutter bar or vertically moving said cutting element at a plurality of frictionally controlled predetermined speeds.

22. In a miningmachine, a motor, a cutter bar carried forwardly of said motor for pivotal movement with respect thereto about a vertical axis, feeding mechanism disposed rearwardly of said motor including a winding drum adapted to have a iiexible feeding member woundthereon, a planetary geared reduction device driven from the rearward end of said motor and having driving connection with said winding drum, and a geared drive connection from said planetary geared reduction device to said cutter bar independent of said winding drum for pivotally moving said cutter bar about said vertical axis.

23. In a miningmachine, a motor, a cutter bar carried forwardly of said motor for pivotal movement with respect thereto about a vertical axis, feeding mechanism disposed rearwardly of said motor including a winding drum adapted to have a flexible feeding member wound thereon and a planetary geared reduction device driven from the rearward end of said motor having driving connection with said winding drum, and a geared drive connection from said planetary geared reduction device to said cutter bar independent of said winding drum for pivotally moving said cutter bar about said vertical axis including a longitudinally extending shaft driven by said planetary geared reduction device and having driving connection with said cutter bar.

24. In a mining machine, a motor, a cutter bar Carried forwardly of said motor for pivotal motor including a winding drum adapted to have a flexible feeding member wound thereon, means driven from the forward end of said motor for driving said cutter chain about said cutter bar and means driven from the rearward end of said motor for pivotally moving said cutter bar independently of said Winding drum comprising a planetary geared reduction device, a shaft driven thereby and disposed to one side of said motor, and a geared Connection from said shaft to said cutter bar. Y

25. In a mining machine, a motor, a cutter bar carried forwardly of said motor for pivotal movement with respect thereto about a vertical axis, a cutter chain carried by said cutter bar for movement thereabout in a closed orbital path, feeding mechanism disposed rearwardly of said motor including a winding drum adapted to have a flexible feeding member wound thereon, means driven from the forward end of said motor for driving said cutter chain about said cutter bar and means driven from the rearward end of said motor for pivotally moving said cutter bar independently of said winding drum comprising a frictionally controlled plural speed planetary geared reduction device, a shaft driven thereby and extending longitudinally along said motor to one side thereof and a geared connection from the forward end of said shaft to said cutter bar.

26. In a mining machine, a wheeled truck, a cutting element mounted on said truck for vertical adjustment with respect thereto, said cutting element including a motor, a projecting cutter bar supported for pivotal movement about a vertical axis disposed forwardly of said motor, feeding and elevating mechanism driven from the rearward end of said motor including a planetary geared reduction device disposed rearwardly of said motor, and means driven by said planetary geared reduction device for pivotally moving said cutter bar about said vertical axis.

27. In a mining machine, a wheeled truck, a cutting element mounted on said truck for vertical adjustment with respect thereto, said cutting element including a motor, a projecting cutter bar supported for pivotal movement about a vertical axis disposed forwardly of said motor, feeding and elevating mechanism driven from the rearward end of said motor including a planetary geared reduction device disposed rearwardly of said motor, and means driven by said planetary geared reduction device for pivotally moving said cutter bar about said vertical axis comprising a longitudinal shaft extending along one side of said motor and having operative connection with said cutter bar.

28. In a mining machine, a wheeled truck, a cutting element mounted on said truck for vertical adjustment with respect thereto, said cutting element including a motor, a projecting cutter bar supported for pivotal movement about a vertical axis disposed forwardly of said motor, feeding and elevating mechanism driven from the rearward end of said motor including a planetary geared reduction device, and means driven by said planetary geared reduction device for pivotally moving said cutter bar about said vertical axis comprising a longitudinal shaft extending beyond the forward and rearward extremities of said motor, said longitudinal shaft having driven connection with said planetary geared reduction device adjacent one of its ends and hav-'l ing connection with said cutter bar adjacent its opposite end.

29. In a mining machine, a wheeled truck, a cutting element mounted on said truck for vertical adjustment with respect thereto, said cutting element including a motor, a projecting cutter bar supported for pivotal movement about a vertical axis disposed forwardly of said motor, feeding and elevating mechanism driven from the rearward end of said motor including a planetary geared reduction device, and means driven by said planetary geared reduction device for pivotally moving said cutter bar about said vertical axis comprising a longitudinal shaft extending along one side of said motor and beyond the forward and rearward ends thereof, a drive connection from said planetary geared reduction device to one end of said shaft and a drive connection from the opposite end of said shaft to said cutter bar.

30. In a mining machine, a wheeled truck, a cutting element mounted on said truck for vertical adjustment with respect thereto, said cutting element including a motor, a projecting cutter bar supported for pivotal movement about a vertical axis disposed forwardly of said motor, feeding and elevating mechanism driven from the rearward end of said motor including a planetary geared reduction device, and means driven by said planetary geared reduction device for pivotally moving said cutter bar about said vertical axis comprising a longitudinal shaft extending along one side of said motor and beyond the forward and rearward ends thereof, a drive connection from said planetary geared reduction device to one end of said shaft and a geared drive connection from the opposite end of said shaft to said cutter bar.

31. In a mining machine, a wheeled truck, a cutting element mounted on said truck for vertical adjustment with respect thereto, said cutting element 'including a motor, a projecting cutter bar supported for pivotal movement about a vertical axis disposed forwardly of said motor, feeding and elevating mechanism driven from the rearward end of said motor including a planetary geared reduction device, and means driven by said planetary geared reduction device for pivotally moving said cutter bar about said vertical axis comprising a longitudinal shaft extending along one side of said motor, a drive connection from said planetary geared reduction device one end of said shaft and a geared drive connection from the opposite end of said shaft to said cutter bar including a worm on the' forward end of said shaft meshing with and driving a worm gear connected to said cutter bar.

32. In a mining machine of the class described, a truck supported on wheels and axles, a plurality of guides extending upwardly from said truck, a cutting element supported on said guides for vertical movement therealong, said cutting element including a motor, a cutter bar having a cutter chain orbitally movable thereabout disposed forwardly of said motor for pivotal movement with respect thereto about a vertical axis, and plural speed means driven from said motor for pivotally moving said cutter bar, elevating said cutting element in said guides and moving said truck on said wheels and axles including a single planetary geared reduction device.

33. In a mining machine of the class described, a truck supported on wheels and axles, a plurality of guides extending upwardly from said truck, a cutting element supported in said guides for vertical movement therealong, said cutting element including a motor, a cutter bar having a cutter chain orbitally movable thereabout disposed forwardly of said motor for pivotal movement with respect thereto about a vertical axis, and frictionally controlled plural speed meansv driven from said motor for pivotally moving said cutter bar, elevating said cutting element in said guides and moving said truck 0n said wheels and axles including a single frictionally controlled pluralV speed planetary geared reduction device.

34. In a mining machine of the class described, a truck supported on wheels and axles, a plurality of guides extending upwardly from said truck, a cutting element supported in said guides for vertical movement therealong, said cutting element including a motor, a cutter bar having a cutter chain orbitally movable thereabout disposed forwardly of said motor for pivotal movement with respect thereto about a Vertical axis, means driven from the forward end of said motor for driving said cutter chain about said cutter bar, and means driven from the rearward end of said motor for pivotally moving said cutter bar,

elevating said cutting element in said guides, and moving said truck on said wheels and axles comprising a single planetary geared speed reduction device.

35. In a mining machine of the class described, a truck supported on wheels and axles, a plurality of guides extending upwardly from said truck, a cutting element supported in said guides for vertical movement therealong, said cutting element including a motor, a cutter bar having a cutter chain orbitally movable thereabout disposed forwardly of said motor for pivotal movement with respect thereto about a vertical axis, means driven from the forward end of said motor for driving said cutter chain about said cutter bar, and means driven from the rearward end of said motor for pivotally moving said cutter bary elevating said cutting element in said guides, and moving said truck on said wheels and axles at a plurality of frictionally controlled speeds comprising a single frictionally controlled planetary geared speed reduction device.

FRANK A. LINDGREN.

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