US1676429A - Mining machine - Google Patents

Description

July 10, 1928.

C. E. DAVIS MINING MACHINE 8 Shets-Sheet l Filed March 4, 1926 1,676,429 C. E. DAVIS MINING MACHINE Filed March 4, 1926 8 Sheets-Sheet 2 Nn mM July 10, 1928.

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C. E. DAVIS MINING MACHINE Filed March 8 She'ets-Sheet 4 w771/0017 or 8 Sheets-Sheet 5 u W W W C. E. DAVlS MINING MACHINE Filed March 4, 1926 July 10, 1928.

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' C. E. DAVIS MINING MACHINE July 1o, A192s. 1,676,429

C. E. DAVIS MINING MACHINE Filed March 4, 1926 8 Sheets-Sheet 7 y C A\ A i July l0, 1928.

` C. E. DAVIS MINING MACHINE 1926 8 Sheets-Shet 8 Filed March 4,

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Patented July l0, 1928.

UNITED STATES;

Parar OFFICE.

CHARLES DAVIS, 0F CHICAGO, ILLINOIS, ASSIGNOE T0 GOODMANMANUFAGPUBING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

MINING' MACHINE. l

Application tiled March 4, 1926. SerialA No. 92,121.

This invention relates to improvements in mining machines, and more particularly t-o machines used extensively 1n coal miningA operations for making the initial or sumping cut in the facev of the mine wall or along the edge of the vein being mined, preparatory to blasting whereby the portion of the vein so cut is broken d own and the coalremov'ed.

The machineembodying the present invention represents a type ordinarily termed a cutting and shearing machine, and is characterized by the mounting of the cutting element on a turntable, which in turn is mounted on a wheeled carriage or truck, whereby the. machine is transported on tracks laid on the iioor of the mine. Moreover, in this type 'of machine the cutting element is capable of being swung in an arc as the'cutting progreses, in addition to being ad]ust able to cut horizontally or vertically, and' elevated to cut at different levels' from the mine'oor. y

The chief object of the present invention is, therefore, to provide a machine thatis exceedingly flexible, in the sense that it 1s capable of use under the different minlng conditions which may be encountered, ltwbeing borne in mind that the method of attacking a coal vein depends largely on the` formation of the vein at the particular point where the cutting is to take place.

The machine herein disclosed is somewhat similar toV that illustrated and described in my previous application, Serial Number 33,624, filed May 29, 1925, in fact, so far' as the lgeneral purpose, design and mode of operation are concerned, the present machine is quite similar to itspredecessor. The 1mprovements and therefore, the features which characterize the machine in the vpresent disclosure, have to do more especially with the driving or power transmitting mechanisms to the several operative parts of the machine.

power for driving other parts, from a separate motor, with independent controls. These parts, or mechanlsms thus driven mf -depfendently,'may be roughly divided as follows: The cutting mechanism and parts intimately associated with the cutting operations'. of the machine, are driven` by one motor, whereas the mechanisms which transport the machine on its tracks and swing the turntable, are driven from the other motor. SeveralA advantages may be ascribed to this arrangement, the chief one being that once the machine has been positioned for a givenv cutting peration, only the motor which drives the cutting mechanism need be used, although should such operation require the simultaneous bodily movement of the ma chine or of the turntable the necessary motive power is available through the other motor. A further advantage of the dual motor drive is the elimination of extended lines of transmission, from a single source of power with the lattendant complication of clutch mechanisms and speed increasing or decreasing gearing.

In the accompanying drawings:

Figure 1 is a general top plan view of the machine;

Figure 2 is an enlarged to plan view of the machine with parts broen away and other parts in section, yto show the driving mechanlsms;

Figure 3 is a view' of the machine in vertical section, taken on line 3-3 ofFi re 2;

Figure 4 is a viewv of the machine 1n side eleva-tion with the cutter head and bar omitted;

Figure 5 is a view in transverse vertical section taken on line 5-5 of Fi re 2;

Figure 6 is an enlarged to p an view of the cutter head and parts adjacent, with a portion thereof shown vin section, taken on line 6.-6 of Figure 3;

Figures 7 and 8 are dia rammatic'views in( side elevation, showing t e positions of .the cutting element in normal positions but elevated for cutting at different heights above v the mine floor;

Figures 9 and 10 are similar views, showing the cutting head reversed so that the cutter chain is uppermost for'making cuts at different levels from the mine ceilin Figures 11 and 12 are similar views s owing the cutting head turned through '90 for making a vertical cut; V i

Figures 13 and 14 are top plan views of the' machine showing other methods of oper-v ating the machine forI making lateral cuts. .Referring first to the main parts of the machine embodying the invention, the same i comprises a wheeled 'platform or carriage A,

adapted to be moved on tracks and carrying a cutting element projecting from the 4forward end of the carriage, said cutting element consisting of a cutting head .B anda cutter bar C, extending radially from the base of the cutting head and carrying an endless cutter chain D.

The carriage A comprises a platform or v .journaled to swing about the center of the platform, `through the medlum of a large circular bearing plate 6, housed in a circular opening at t e center of the platform and provided at its periphery with a radially extending bearing ring 7, bolted to the turntable andlforming a shoulder bearing upwardly against the platform.

- Journaled at the center of the bearing plate 6, is a vertical stub shaft y8, having a spur gear 9 keyed at its upper end and above the bearing plate 6, and a mitre gear 10 below said plate. The lower end of the stub shaft is journaled in a bearing 11, fixed to the platform 1. The mitre gear 10 meshes with a pair of mitre gears 12, at the inner ends of two fore and aftppropeller shafts 13, journaled in sleeve bearings 14, 14 hung from the `under side of the platform 1. At the.

outer ends of the propeller shafts are mitre gearsl, 15 meshing with other mitre gears 16, lixed to the wheel axles 3. This gearing constitutes the drive for transporting the machine along the tracks, the power being delivered to the spur gear 9 through other drive mechanism supported on the turntable and hereinafter to be described.

Mounted upon the turntable 5 is an elevating platform 17 on which is supported` the cutting mechanism 'with its drivingv mechanism and motor. This elevating platform, however, does not extend over the entire surface of the turntable, a considerable portion at the rear and central portion being cut. away to accommodate the axle-driving and turntable-revolving mechanism, including its separate motor, and shown in Figure 1 as located at the lower rear half of the Aturntable and mounted directly thereto.

the tilting movement of the platform lis p about the horizontal axis of thesetrunnions or generally speaking, about the rear end of the machine. It is to be observed, however, that the lower trunnion 18, in .Figure 1,` while located at the rear corner of the turni table, is formed in part` by an arm 181'extending transversely from the rear corner of the platform 17. Located forwardly of the trunnions and in longitudinal alignment therewith is a pair of upright gear sectors 19,' 19 fixed to the turntable. These gear sectors mesh with pinions forming a part of the platform elevating mechanism, hereinafter described.

Mounted at the forward end of the platform is the cutter bar assembly and the driving mechanism thereof,.`and which will now be described.

Considering lirst the supports for the cutting mechanism, there is formed integral with the platform' a forwardly extending cradle 20, inclined slightly in a downwardly direction, and supporting at its outer end and the main forward bearing 21 for thec-utting mechanism, presently to be described in detail.

As clearlyshown inlFigures 1 and 3, the cutting head B is located just beyond the forward bearing 21, and forms an integral part of a long tubular sleeve bearing for the cutter bar drive shaft, extending rearwardly from this head to a point substantially central of the machine. This bearing sleeve is inclined at an angle of about 15 to the horizontal with its forward end about on a level with the turntable. The rear end of this bearing sleeve 22, is journaled in a rear main bearing 23, integral with the platform 17. `Within the sleeve 22, is the main drive shaft 24'With its forward end extending into the cutter' headv 13. Carried on the sleeve 22 are other operating parts hereinafter to 4be described.

At the rear end of this shaft 24 and just rearwardly of the main bearing 23, is a gear wheel 25 loosely mounted thereon, but adapted to be thrown into and out of driving connection with the main shaft 24 by a single throw clutch 26, keyed to the end of the shaft. It may be stated at this point that the drawings have been simplified by omitting complete details of the clutches, it being understood that they are of the common form consisting` of shiftable collars operated by lever-controlled shifting yokes and provided lll) with clutch y teeth which engage complementary clutch teeth on the gear or parts connected with the member on which it is loosely mounted.

As clearly hown in Figure 3, the bearing sleeve 22 extends from the rear main bearing 23 through' the front main bearing 21 and carries at its forward end a semispherical shaped casing 27 forming one section of the cutting head B, all of these parts, including the cutter bar, forming a unit .which is capable of being rotated bodily in said main bearings 21 and 23, and about the axis of the main drive shaft 24 which projects into the casing section 27 and carries al mitre gear 28 which in turn delivers power to the cutter chain C through gearing in the cutter head. Y if" As shown in Figures 1, 2 and 3 the central portion of the cradle 20 is open and forms a slot 20a extending rearwardly from ythe main forward bearing l21, and registering with the slots 1a and apin the turntable and platform below, thus leaving an open space to accommodate the inclined cutting mechanism assembly. Within this opening or slot isa brace 29 (Figure 3) extending from the under side of the forward main bearing 21 rearwardly and parallel with thev axis of the cutter drive shaft 24, said brace being journaled on a pin 29aL extending crosswise of the slot 5a in the turntable 5 and just above the front axle 3.l The forward end of the brace 29- is likewise pivotally connected with the bearing 21 through the medium of ears 21a depending from the bearing 21, and a removable pin extending through said ears.

Surrounding the bearing sleeve 22 and extending rearwardly from lthe forward main bearing 21 is al rotatable sleeve 30 having square helical threads cut on its outer surface. This sleeve terminates at its rear end a short distance from the rear main hearing 23, and has keyed thereto a beveled gear 31. Between the beveled gearV 31 and said rear main bearing 23. is a sleeve'or keyed to the cutter drive Shaft 22, at 32a. 'A thrust 'bearing 33 is located between the forward end of the collar 32, andthe bevel gear wheel 31, mounted on the threaded sleeve 30. Slidably mounted in a longitudinal slot in the collar 32, is an endwise shiftable locking sbar 34, slightly longer than the collar and adapted to be actuated by a pinion 35 engaging `rack teeth alongone edge of the bar, said pinion being rotatedrby hand by apply ing a wrench to a( square end 35a of the pinion shaft. (Figure y 2). In the, main bearing 23, and at two or more points about the hub of the beveled gear 31are loc-kingl notches 23a and 31a respectively adapted to receive the ends of the lock bar'34, this arrangement forming'a clutch for locking the collar 32'and bearing sleeve against rotation in the rear main bearing 23 when the locking bar is shifted rearwardly Ato engage the locking notch 23a as shown in Figure 2. Similarly by shifting the lockingbar 34 forwardly with its end engaging one of the notches 31a in the hub of the beveled gear 31, the collar 32 together with the bearing sleeve 22 are free to turn as a unit in the main bearings 21 and 23. lIn fact the entire cutting mechanism can be turned about outer threaded sleeve 30, and is adapted toy be normally held against bodily rotation, so that as the thieaded, sleeve rotates in either y direction the nut will travel forwardly or rearwardly along the sleeve. The travelling nut is held against rotation about the sleeve by means of the vbrace 29 which it'will be observed from Figure 3 normally engages the lowermost of the several slots 36 extendling lengthwise of the outer' surface 'of the nut. It will be further observed that there are three of such slots 36a in the outer surface of the nut, so that any one of them may engage the brace 29 depending on the angular position to which the nut is turned about its axis. To disengage the brace 29 :from the groove 3 6av in the nut, the journal pin at its forward end is removed,'thus allowing the brace to be dropped, thuspermitting the nut 36 to turn with the sleeve 30 as is necessary when the entire cutting mechanisml is turned in the main bearings 21 and 23.

Referring now to the construction of the cutting head B, and cutter barC (Figures 1 and 3) the head has 'already been described as substantially spherical in shape and comprising an upper casing section 27 integral with the`bearing sleeve 22. The lower half of the casing is formed by a wall section v37, semi-circular in shape, which is movable relative to .the relatively fixed upper section and has sliding contact therewith through the medium of suitable sealing rings 38.

[Referring now to the internal mechanism of the cutter head (Figures 2 and 6) a vertical bearing sleeve 40 extends upwardly into the head B', and provided near its upper end with laterally .projecting trunnions 41,41, which are journaled in bearings 42 formed vin the side of the head, whereby the entire cutter bar is suspended from the head and is capable of being swung about a vertical axis transverse to the axis of rotation of the drive shaft 23.

As clearly shown in Figure 3, the lower movable section 37 is integral with the bearing sleeve 40, and immediately below the same is an annular hearing sleeve or plate 43, having a downwardly facing bearing surface against which bears vthe rear end frame member 44 of the cutter bar C, the same having an integral spindle 45 extending upwardly into thesleeve 40, and carrying" intermediate beveled gear wheel 49 transmits power from the gear wheel 28 to the gear wheel 48.

The vertical shaft 47 extends below the head 44 of the cutter bar C and has keyed to its lower, end a sprocket wheel- 50 whichY drives the cutter chain D (Figure 1) which consists of an endless chain, carried by the cutter har, and travelling in lateral grooves or tracks 51', along the edges of the cutter bar. The chain carries a series of cutting tools 52 at intervals throughout its length, which perform the actual cutting operation as the. cutter bar is advanced laterally. The construction and operation of .the cutting bar being old in the art, further details are believed to be unnecessary.

It may be. stated at this point that the cutter bar, which includes the spindle extending upwardly into the sleeve 40 within the cutting head B, is capable of being swung in an arc about the axis of the shaft 24, and also to be tilted upwardly and downwardly about the horizontal axis of the trunnions 41, 41. The mechanism for swinging the cutter bar laterally will be first described.

As shown in Figure 6, the rear end frame member44 of the cutter bar is extended onl one side laterally at right angles to the bar itself, to form the equivalent of a lever arm 53 having a rearwardly facing clevis 54 formed integraltherewith. Extending from this extension 53 rearwardly tothe travel-- centerline of the turntable.

Referring now to the driving mechanism for the cutter bar, the prime mover is an lelectric motor 57 mounted at the rear end of the platform 17. The armature shaft of theV motor extends' from the forward end of the motor casing and carnes a beveled pinion -58v which drives a primary drive shaft v59 extending oblique and parallel with the lend portion of the cutter bar drive shaft assem# bly, and is journaled in a bearing 60 located 4below the rear-endv of the cutter bar drive Ashaft l24 (Figure 3). .This primary drive shaft carries at its rear end a.v beveled gear 61 meshing withl the armaturev pinion 58 and at its oppositeor lower 4end a spur pinion 62 (Figure 2)'.

Immediately above and forward of theI the drive from the motor to the cutter bar is through the gears 58, 61, 62, 65 and 25 respectively, and controlled'by the clutch 26.

The secondary shaft 63 is likewise arranged parallel with the axis of the cutter bar drive shaft assembly and carries near its lower end a pair of' spur gears 66 and 67 (Figure 2.),spaced apart, and both loosely mounted on the shaft. Associated with each of these gears'is a clutch 68 and 69, respectively, the same being preferably operated by a unitary-clutch lever whereby one is released as the other is thrown in, --and vice versa. The uppermost or right hand gear wheel 66 is somewhat larger than thel gear wheel 67 aty the lower end, there being another gear wheel 70 of the same size meshing with the latter, and positionedjust above and alittle to one side thereof.

Extending parallel with the secondaryshaft 63 is still a third driving shaft 71, like wise arranged oblique to the horizontal and parallel with the shafts 59 and 63. This third or final drive shaft is supported in bearings 72,72, at eachend likewise mounted on the platform l17, and is positionedpabove and outwardly from the secondary shaft 63 near the edge of the platform. 'y

Intermediate the ends of this final drive shaft are two spur gears 73 and '74 fixed to the shaft side by side, the one on the right (Figure 2) meshing with the larger gear wheel 66 on the secondary shaft. 63, and the other meshing with the intermediate gear 70 which is driven from the smaller gear wheel` 67 on the secondary shaft. This arrangement Ofgearing, therefore, provides for the driving of the final drive shaft in either direction, i.` e., forward or reverse, by the shifting of the clutch members 68 and 69. At the lower end of the final -drive shaft is mounted a Worm- 75ymeshing with a worm wheel 76 immediately below, and fixed to the end of a transverse shaft 78 journaled ina bearing 77. This shaft extends toward .the

cutter bar drive shaft assembly and carries at its inner end, a beveled gear 79 meshing i withthe/beveled gear 31 carried byl and turn ing with the threaded rotative sleeve 30 controlling the lateral swinging movement of.-

the cutter bar through the traveling nut ,36

and connecting link 55. It is to be observed however, that when the lockbar 34 is shifted to connect the beveled gear] wheel 31 to the collar 34, the entire cutting mechanism can Y be turned in the main bearings 21'` and 23,-` to 4 'This worm meshes with a worm wheel 82 (Figure 3) immediately below, the same being fixed to ashaft 83 vextending transversely the full width of the platform 17, and having bearing near its ends in bearings 84 and 84, and centrally in the main rear bearings 23 of thi; cutter bar drive shaft assembly (F igure 3 At thel extremities of said shaft are pinions 85, 85, which mesh with the upright gear sectors 19 which are anchored to the turntable 5. This mechanism just described constitutes the platform elevating and lower-l` ing mechanism and is controlled by the clutch 81 which is thrown in when the shaft 71 is being driven in the proper direction to lower or raise the platform as desired.

The foregoing completes the mechanism for driving and controlling the cutter bar in The gearin driven bythe motor 86 will now be descri ed. A pinion 87 is lixed to the motor armature shaft projecting from its forward end, and meshes with a spur gear 88 fixed at one end of a horizontalv drive shaft 89 o'set to one side of the armature shaft and journaled in a bearing 90 supported on the turntable, (Figures 2, 4v and 5). Keyed to the shaft 89 intermediate its ends is a ldrive pinion 91 and at its forward end' is a mitre gear A92 meshing with another mitre gear 93 loosely mounted on a vertlcal stub shaft 94 (Figure 5), lextending from the turntable upwardly through a gear casing 95 formed integral with a bearing 96 supported upon the turntable. At the lower end of the shaft 94 is fixed a spur gear 97 lying in the plane of the spur gear 9 fixed to the upper end of the axle drive stub shaft 8 and meshing therewith. f

The ear casing 95 is located above the turntable and encloses a worm wheel 98 keyed to a sleeve 99 turning loosely on the shaft 94. Also keyed to the shaft 94- and below the ear) casing 95 is adouble clutch throw mem er 100 adapted to be shifted in opposite directions, that is, downwardly toV engage the beveled gear wheel 93 or upwardly to mesh with clutch teeth 99 at the lower end of the sleeve 99, carrying the worm wheel 98. Moreover, the clutch member may be shifted into an intermediate or' neutral pos1t1on which permits the bevel gear wheel 93 to idie on the shaft 94.

The gear casing 95 also encloses one end of, a worm shaft 101 carrying a worm 102 meshin with the worm Wheel 98. This worms aft 101 extends from the gear casing 95 and carries at its free end a spur gear wheel 103, meshing with the intermediate fixed gear wheel 91 on the drive shaft 89 (Figure 2).

The mechanism and gearing thus far described, has to do entirely with the drive 4to the axles and wheels for moving the machine along the tracks. Moreover, the mechanism described' provides for both low and high speed, in either forward or reverse directions. Thus it will be seen that, in the neutral position of the clutch 100, no, wer is delivered to the shaft 94, since'both the bevel gear 93 and the worm gear 98 are idling on the shaft, although both are a1- ways in driving engagement with the shaft 89, the beveled gear 93, being driven through the beveled gear 92, and the worm wheel 102 through the Worm shaft 101 and the intermediate spur gear 103- on said .worm shaft. N ow, by shifting the clutch 100 downwardly the power is transmitted directly from the shaft 89- to thestub shaft 94, through the intermediate train of gears 92,93, 97 and 9, with some reduction in speed. On the other hand, by shifting the clutch upwardlythe power is now transmitted through the worm gearing, to the shaft 94 and thence to the axles through the same train of gearing from the lower end of the shaft 94. In followingthe train through the Worm drive, however, there is an additional step in the train which brings about a reversal of direction at the Wheels, so that by driving through one train the direction of movement isl the reverse of that obtained v in driving through the other train.

In somewhat the same manner that power is delivered from the lower end of the ver tical shaft 94 for driving the truck wheels, power is delivered from the upper end of the same shaft for revolvin the turntable about its central bearing on t e main platform of frame 1. This will now be described.

At the upper end of the sleeve 99 is a spur' gear104 (Figures 1, 4 and 5) which meshes with a gear wheel 105, lying in the same horizontal plane, just above the top of and meshes with the third gear Wheel 109 which in turn meshes with the second gear wheel 105 (Figure 4). I

At the'lower end ofthe driven shaft 106 is a pinion 110, which meshes with a curvilinear rack or gear vsector 111 (Figures `1,

. 2 and 4) and consisting of teeth cut in the rear edge of the main frame or`plate 1 of the machine. This pinion 110 is loosely mounted on the shaft 106, and isconnected thereto by means of a clutch member 112. keyed to theshaft and shiftable into and out of clutching engagement with said pinion.

Thus by shifting'the clutch 100-into neutral position and operating Ithe motor 86 in the proper direction, the gear train 104, 105, etc., is driven from the worm wheel`v98, to swing the turn table in either direction when the clutch 1112 is thrown in to connect the gear wheel 110 with the shaft 107.

As is customary in machines of this char-` acter, the control. levers arev centralized so that the machine operator can control the Amachine from one position, but since this scheme is not novel in the present machine,

' the controls are omitted.

This completes the detailed description of the machine and its operating parts, and the remaining descriptive matter will be de voted ,toa discussion ofthe operation of the machine with the aid of F lgures 7 to 16 of the drawings. Y

Figure 7 shows the machine in position for making a lateral cut at the level of the mine floor, where it is desired to undercut the vain immediately in front of themachine. if

Figure 8 shows the position vof the cutter har in making a lateral cut at a level above the Hoor, this being accomplished by elevatingthe platform 17 to an inclined posi-l chine in making a cut substantially midway Y between the floor and the ceiling, the height being such that the platform may be lowered `as in Figure 8, but the cutting head'and cut'- ter bar are turned upwardly or through 180 from the position s own in Figure 8.

Fi res 11 and 12 show the manner in whic the machine maybe operated in making a shearing cut,-th'at is, a vertical cut from top to bottom inthe vein immediately ahead of the machine. Figure 11 shows the`machine-about to make the initial cut,

the cutter head .and bar being revolved through 90"'so that the bar isbrought into angle of a out 45. In this position the mai chine is propelled forward on the trackv and when the desiredv depth is reached the machine is brought to rest and the cutter bar swung in a downward direction to the floor level. Figure 12 shows the same vertical cutting operation carried out where the ceil-l ing is considerably higher than that shown in Figure 11. In this case the added vertical reach is obtained by elevating the platform 17, thereby increasing the vertical range of the cutter bar.

Figure 13 shows the machine making a cut in the side wall and parallel to the tracks in which the machine moves. In this position the turntable is swung at an angle of 45 toward the side Wall and the cutter bar positioned at 45 to the turntable', sor that it stands at right angles to the tracks. Thus, by moving the machine bodily along the track, the cutting progresses in the direction of the movement of the machine.

Figure 14 represents the cutting operation in which the cutter bar is yswung from right to left in an arc Without moving'the machine until the cutter bar has swung'through an arc of substantially 90, whereupon the cut is continued in a straight yline by swinging the turntable `from right to left until the cut has been completed, either by bringing the cutter bar out of the cut with a swinging cut or by withdrawin the cutterbar before the cut has been comp eted and then moving the machinebodily to the left and continuing tfhe cut in a lateral direction from right to le t.

From the foregoing explanationlt will be so c on. I

the conditions which maybe met in mining operations. (Structurally the machine is exceedingly light and compact considering thel rather intricate mechanism required for ad- `justing the parts into the several cutting positions obtainable and for directing the cutter bar along a prescribed line of cutting.

Although I have shown and described one form in which my invention may be emv bodied, it will be understood that the construction and arrangement of the'diiierent arts may vary widely without departing rom the spirit and sco e thereof. .Furthermore, I donotwish to e understood as limiting myself to the specific construction illustrated herein, excepting as it may be limited in the appended claims.`

Therefore, having heretofore described the structure of my machine, its advantages, and the conditions under which it may be oper# ated,

I claim as my invention:

1. In/ a mining machine, the combination of a wheeled carriage, a turntable mounted. on said carriage, an elevating platform tiltf driving connections with said driving and ably mounted on said turntable, cutting mechanism mounted on said platform, driving mechanism for said cutting mechanism mounted on said platform, and independent .driving mechanism mounted on said turnmounted onl said platform, driving mechanism for said cutting mechanism mounted on said platform, and-independent driving mechanism mounted on said turntable for moving said carriage and turntable. v l

3. In a miningmachine, the combination of aI turntable, a tiltable elevating platform mounted on said turntable, cutting mechanism mounted on said platform, 4driving mechanism operatively connected with said' cutting mechanism elevating mechanism operatively connected with sai` platform, a motor mounted on said platform and having elevating mechanisms, and a motor mounted on said turntable and having driving connections therewith.

4. In a mining machine, the combination of a turntable, a platform hinged at one end to said turntable, cutting mechanism mount-` ed at the opposite end of said platform, driv- -ing mechanism mountedv on `said platform and comprising a motor in operative connection with said cutting mechanism,- means driven by said motor forraising and lowering said platform, anda separate motor and driving mechanism carried by said turntable for swinging the same about its axis.

5. In a mining machine,`the combination of a wheeled carriage, a turntable mounted on said carriage', a platform hinged to said turntable and adapted to be tilted about the Y rear end thereof, cutting mechanism carried at the forward end of said platform, a motor` mounted adjacentv the rear end of said platf form, driving .mechanism intermediate said motor and said cutting mecha-nism, elevating mechanism for saidplatform driven'through said driving mechanism and independent drivin mechanism including a motor for pro el ing said carriage and for swinging sai turntable.

6. In a mining'machine, the combination of a wheeled carriage, av turntable pivotally mounted centrally of said carriage, a platform hinged at one endto the rear of said turntable, cutting mechanism supported at the forward end of said platform, a motor mounted adjacent the rear of said platform and having driving connection with said cutting mechanism, elevating mechanism for said platform operative by said motor', an auxiliary motor mounted on said turntable, andmeans driven 'by said last mentioned motor for actuating said carriage and turntable.

7. In a. mining machine, the combination of a-.wheeled carriage, a turntable mounted on said' carriage, a platform having hinged connection at the rear of said turntable, a cutter mounted at the forward end of said platform, driving mecha-nism and elevating mechanism associated with said cutter and platformI respectively, a. motor operatively connected with said cutter driving and platform elevating mechanisms, clutches interposed between said motor and said cutter driving platform elevating mechanisms, a separate motor mounted on Said turntable, and gearing driven byvsaid last mentioned motor and operative to propel said carriage and to swing said turntable.

In a mining machine, the combination of a vWheeled carriage, a turntable mounted to swing in a horizontal plane about the ,center of said carriage, a platform having hinged connection r`with 'said turntable' and adapted to be tilted about the rear end thereof, cutting mechanismcarried at the forward end of said platform, a motor mounted adjacent the rear end of said platform, driving mechanism intermediate said motor and said cutting mechanism, auxiliary driving mechanism for elevating said platform operatively connected with said motor, lsaid platform having'a portion removed adjacent its rear end, and separate driving mechanism including a motor for propelling said carriage and for swinging said. turntable, mounted on said turntableand within the space provided by the removed portion of said platform.

- 9. Ina mining machine, the combination gf a Wheeled carriage, a turntable mounted on said carriage, a platform having hinged connect1on at thev rear of said turntable, a

cutter bar mounted at the forward end of.

ably mounted lon said turnta le, elevating mechanism for said platform, cutting mech-- ansm -mounted on 'said platform, driving mechanism mounted on said platform-pand operatively connected with said cutting and elevating mechanisms, and independent drivin mechanism including a motor for operating said turntable.

11. AIn 'a mining machine, the combination of a Wheeled' carriage, a turntablemount-ed ist on said carriage, an elevating platform til-trate motor for driving the" carriage and said ably mounted on said turntable, cutting mech' turntable. n I anism supported on said platform, a motor Slglled at DaVeIlPOl?, 111 the-COUDY 0f 10 mounted on said platform and having driving Polk and' State of Florida,v this'17 day of 5 oonnection'with said cutting mechanism, ele- February, A. D. 1926.

' vating mechanism for Asaid platform operatively connected with said motor, and a sepa- CHARLES E. DAVS.

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