US1920271A - Mining machine - Google Patents

Description

C. F. OSGOOD MINING MACHINE 4 Sheets-Sheet 1 Filed Oct. 20, 1930 Imevziameff. 0550067.

Aug. 11, 1933. c, F OD 11,920,271

MINING MACHINE Filed Oct. 20, 1930 4 Sheets-Sheet 2 I (92 1, ljaufl 949 95 W50 a 50 as 9/ 41 I 48 a4 5, 55 r k k V, J v 1\ l I M; mien 0m mumw 59 g I I 9 V I Ill A M A M Aug. 1, c F. QSGOOD 1,920,271

MINING MACHINE Filed Oct. 20, 1930 4 Sheets-Sheet 3 Ive/van uagmwzem' 0590125. M I'm- Aug. 31, c QSGOQD MINING MACHINE Filed Oct. 20, 1930 4 Sheets-Sheet 4 EQQCJQ g 94 w4-mu- UNITED .STATES PATENT ems;

' MINING MACHINE Charles F. Osgood, Clarcmont, N. H., assignor to Sullivan Machinery Company, a Corporation of Massachusetts Application October 20, 1930. Serial No. 489,890 I 21 Claims. (Cl. 262 m) Ihis invention relates to mining machines and more particularly has reference to improvements in the flexible feeding means of a coalniining machine of the continuous cutter, bottom cutting An object of this invention is: to provide an improved coal mining machine. A further object is to provide an improvedcoal mining machine having improved feeding means. Another object is to provide an improvedmining machi ne of the flexibly fed, continuous cutter, bottom cutting type which is extremely low in height and especiallyadaptedjto use in lowvein Work. A further object of this invention is to provide an improved mining machine of the flexibly fed, 1'

com and pillar type. Another object is to provide an improved mining machine of the aforesaid character having improved feeding and means whereby the machine may be fed trolled in a more facile and expeditious guiding and conmanner.

A further object is to provide an improved mining machine of the room and pillar lowvein type having improved feeding and guiding mechanism wherein separate relatively rotatable, p

erated and controlled feeding and controlling members respectively cooperating with flexible feeding elements are employed separate for feeding and guiding the machine for sliding movement over the mine floor, the feeding and controlling meznbers and the driving mechanisms therefore being arranged in an improved .manner on the machine whereby the latteris.

rendered extremely compact vertically. These and other objects and advantages of this invention will,

however, hereinafter more fully appear. In the accompanying drawings there is shown for purposes ofillustration two formswhich the invention may assume in practice.

In these drawings,-

Fig. l is a plan view of the illustrative embodiment of a mining machine constructed in accordance with the preferred form of the invention;

Fig. 2 is a side elevational viewof the shown in Fig. l; 7

machine Fig. 3 is an enlarged plan view of the forward portion of the improved mining. machi being shown in horizontal sectionto structural details;

e: parts illustrate Fig, l .a central, longitudinal extending, verticalsectional View takensubstantiallyon line 4-4 of Figs. 1 an 3;

Fig. 5 is a transverse vertical'sectional vie taken on line 5-.-5. of Figs. 1' and 3;

Fig. 6 is a detail sectional view illustr ating the central bearing support for oneof the haulage trating a machine Fig. 9 is an enlarged horizontalfsectional view illustrating a portion of the driving gearing for the cutting and feeding mechanisms;

Fig. 10 is a central,, longitudinally extending, vertical sectional View taken substantially on line l8l0 of Figs)? and 9; and

Fig. 11 is a transverse vertical sectional viewtaken substantially on line llll of Figs. 7 and 9.

In the illustrative form of the invention shown in Figs. 1 tov 6 inclusive there is shown a coal mining machine of the flexibly fed, continuous cutter, room and pillar type generally comprising a machine frame or body lof generally rectangular shape having a plane bottom surface on which the machine is supported for sliding movement over the mine floor. Thefram'e or body comprises a rear -motor section 3 and a front cutter carrying and feed section 4. As is usual in the mining machines of the room and pillar type, rigidly secured within thefront frame section e and projecting forwardly lengthwise oftlie machine. is an elongated plane cutter bar 5 supporting on its margin'an endless cutter bit carrying cutter chain 6. In the present construction themotor frame section 3 rests directly on its bottom on. the mine floor and the vertical di: mension of this motor substantially determines the height of the machine. This motor maybe of thereversible type havingits power shaft"? horizontally disposed midway between the top and bottom of the motor frame and extending longitudinally of the. machine. Arranged at the forward :end of the machine at opposite sides of thelongitudinal median line thereof are relatively rotatable feed operating and controlling members 8 and 9 herein in the form of cable winding or haulage drums with which'fiexible feeding and controlling elements 10 and 11,

herein cables or ropes, respectively cooperate.

The haulage drums 8 and 9 are disposed on parallel vertical axes in anovel manner and these drumsand the cutter chain dare operatively connected tothe forward end of the motor shaft through improved transmission means to be hereinafter .described. If desired the feeding and controlling cables may be extended directly from the haulage drums during the feeding of the machine but in the present instance, there are provided suitable guide sheaves and the cables, after passing around any preferred guide sheaves, may be extended in any preferred direction from the machine and attached to suitably positioned anchors in the manner which is well understood in the mining machine art.

Now referring to the improved feeding and cutting mechanismsand more particularly to the improved transmission means therefor, it will be noted that secured to the forward end of the motor shaft 7 is a spur pinion 15 meshing with an internal gear 16 fixed to a horizontal longisection land is arranged with its axis lying in the central longitudinally extending vertical plane of the machine. Secured to and rotatable with the internal gear 16 is a bevel pinion 18 meshing with a bevel gear 19 rotatable in a horizontal plane beneath the longitudinal shaft 1'7, as clearly shown in Fig. 4. The hub of this bevel gear is suitably journaled within the frame section 4 and is connectible by a sliding clutch 20 of a usual design to a vertical shaft 21. The sliding clutch 20 is provided with usual shipper mechanism 22 having an operating handle 23. The shaft 21 is suitably journaled within the frame section 4 and has fixed thereto a sprocket 24 which engages and drives, in the manner well understood in the art, the cutter chain 6. This cutter chainsprocket is arranged within a chamber '25 extending transversely beneath and through the sides of the frame, as shown in Fig.

'2, and this chamber forms a cuttings passage through which the cuttings brought back by the cutter chain are expelled. It will thus be seen that the cutter chain may be connected in driving relation with the motor or remain idle at will. Fixed to the forward end of the shaft 17 is a spur gear 26 meshing. with a spur gear 2'7 keyed to a horizontal shaft 28 herein arranged parallel with, and above the shaft 17 and likewise suitably journaled within the frame section 4. 'In the p esent instance, the spur gears 26, 27 are change speed gears and may be removed and replaced with gears having different tooth ratio so that differently related predetermined feeding speeds may be obtained. Herein keyed to the shafts l7 and 28 are worms 29 and 30, the worm 29 having teeth of steeper lead and oppositely inclined from the teeth of the worm 30. However, since the shafts l7 and 28'rotate in opposite directions the worms effect drive in the same direction although at different speeds. Separate and distinct plural predetermined speed transmission mechanisms generally designated 31 and 32 are provided between the worms 29, 30 and the haulage drums 8 and!) respectively, and as the structure of each of these transmission mechanisms is substantially identical, the description of one will suffice for both.

Now referring to the plural predetermined speed transmission mechanism 31 between the worms and the haulage drum 8, it will be observed that meshing with the worm 29 is a fast speed worm wheel 33, while meshing with the worm 30 is a slow speed worm wheel 34, these worm wheels being arranged on alined vertically extending axes parallel with the axis of thehaulage drum. These worm wheels are suitably journaled within the frame section 4 and are arranged in an extremely compact manner thereby reducing the vertical dimension of the feeding mechanism to a minimum. Journaled within bearings supported by, the hubs of these worm wheels is a vertical shaft 35 and the worm wheels are selectively connectible to this shaft by means of multiple disc clutches 36 and 3'? respectively, of a usual. design. Keyed to the lower end of the vertical shaft 35 is a spur pinion 3S meshing with the teeth of an internal gear 39 herein formed integral with the haulage drum 8. It will thus be seen that when friction clutch 36 is applied and clutch 3'? released, the haulage drum 8 may be driven. in winding direction at a relatively high speed through gearing 15, 16, shaft 17, worm gearing 29, 33, shaft 35 and the spur pinion 38 tion with the haulage drum 9.

the type disclosed and as they do not per se meshing with the internal gear 39 secured to the drum. It will also be seen that when clutch 36 is released and clutch 37 applied the haulage drum 8 may be driven in winding direction at a relatively slow speed appropriate for cutting through the reduction gearing 26, 27 and worm gearing 30, 34. As previously mentioned, the transmission mechanism 32 for the haulage drum 9 is substantially identical to that for the haulage drum 8 and includes fast and slow speed worm wheels 40 and 41 meshing with the worms 29 and 30 respectively and connectible by similar multiple disc clutches 42 and 43 in driving rela- When one or the other of the friction clutches e2, 43 is applied and the other released, the hauling drum 9 may be rotated inwinding direction at either a relatively high speed or a relatively low cutting speed, depending upon which'one of the clutches is applied. It will be noted that the haulage drums may be rotated separately or simultaneously and that the friction clutches may be so released as to permit the drums to rotate in unwinding direction under various degrees of frictional resistance. Upon full release of the clutches the drums may rotate freely. If desired a usual main haulage drum controlling clutch may be interposed in the drive between the vertical shaft 35 and the drum or in any other suitable location so that at certain times the drums may be entirely disconnect-ed from their drive, for instance, when it is desired to unwind the feed cables from the drums by hand. Such clutches are usual in mining machines of enter into this invention, illustration of the same is thought to be unnecessary.

The operating means for the friction clutches 36, 37 within the worm wheels 33, 34 respectively herein comprises'a shipper yoke 44 pivoted at 45 on'the machine frame and equipped with rollers 16 engageable with the opposite plane surfaces of cylindrical pressure plates 4'7 and 48 for the clutches respectively. The means for swinging the shipper yoke about its pivot comprises a shaft 19 rotatably mounted within suitable bearings carried within the frame section 4 and having an eccentric portion 50 pivotally connected to the shipper yoke. Secured to the outer end of the shaft 49 at the rear end of the machine is an operating handle 51. It will thus be seen that when the handle 51 is rotated in one direction or the other the shipper yoke i4 is swung upwardly or downwardly about its pivot to apply either the clutch 36 orthe clutch 37. The parts are so ar-- ranged that it is impossible to effect simultaneously application of the clutches, one clutch always being released when the other is applied and when the shipper'yolce is in its neutral position both clutches are releases. Similar operating mechanism including a ship-per yoke 52, operating shaft 53 and operating handle 54 is employed for controlling the friction clutches 42, 43 in the drive for the haulage drum 9. Each of the haulage drums S and 9 is iournaled Within the frame section 4 in a similar manner, and, as shown in Fig. 6, the haulage drum 8 is provided with a hub portion 55 rotatably supported on ball bearings 56 within the machine frame. A spacing sleeve 57 and a central holdingv bolt'58 are provided for 16.5

maintaining thedrum'bearings in proper spaced relation. As shown in Fig. 5, the haulage drums 8 and 9 are arranged within a chamber 59 extending transversely completely across the frame section 4 above the rear end of the cutter bar 5 so 50 that the feed cables may be extended-from the drums in various directions.

In1the form of the, invention show in Figs. 7

' toll inclusive, there is disclosed a mining machine of the same general character as that described above except in this form of construction the feeding and controlling drums are arranged at the rear end of the machine and the feeding and cutting mechanisms are driven from the rear end of the motor, themotor being located at. the

tion 69. Rigidly secured. within the bed section 67 and projecting forwardly lengthwise of the machine, is an elongated plane cutter bar '70 carrying a usual endless cutter bit carrying cutter chain 71. Arranged at the rear end of the machine at opposite sides of the longitudinal median line thereof are relatively rotatable feed operating and controlling members '72 and '73 hereinin the form of cable winding or haulage drums with which flexible feeding and controlling elements '74 and herein cables or ropes respectively cooperate. As mentioned above the motor 68 is arranged at the front end of the machine above .the cutter bar 70 and herein may be of the reversible type having its power shaft '76 horizontally disposed and extending longitudinally of the machine. The haulage drums 72, 73 are disposed on parallel vertical axes in a novel manner and the cutter chain and the haulage drun s are connected to the rear end of the motor shaft through improved transmission means. As in the form of the invention described above, suitable guide sheaves are provided around which the feeding and controlling cables may pass in the feeding and guiding of the machine, as is usual in machines of the character disclosed.

The improved transmission means between the motor and the feeding and cutting mechanisms herein comprises a spur pinion 77 meshing with an intermediate gear '78 in turn meshing with an internal gear '79. This internal gear is suitably journaled within the frame section 69 and is fixed to' a horizontal longitudinally extending shaft 880 suitably journaled within the frame section 69. Fixed to the hub of the internal gear 79 is a bevel pinion 81 meshing with a large bevel gear 82 rotating in a horizontal plane beneath the shaft as clearly shown in Fig. lfL This bevel gear is suitable journalecl within the frame section 69 and is connectihle by a sliding clutch 83 of a usual design to a vertical shaft 84. This sliding clutch is provided with a usual shipper mechanism 35 having a control handle 86. Shaft 84 is suitably journaled within the frame sections 67 and 69 and has keyed thereto at its lower end a spur pinion 8'7 meshing with a spur gear 88 keyed to a vertical shaft 89likewise suitably journaled within the framesections 67, 69. Fixed to the hub of this spur gear is a sprocket 90 which engages and drives the cutter chain ll in the usual manner. In this form of the in vention the cutter chain extends beneath the frame sections 68, 69 and the drive sprocket 90 is located at the rear end of the machine beneath the haulage drums so that the cuttings brought back by the cutter chain are discharged rearwardly through a passage 91 opening through the rear end of the machine frame. Fixed to the tion described above.

are connected to the haulage drums respectively rear end'of. the shaft 80 is a spur. gear 92 mesh ing with a spur gear. 93 fixed to a horizontal shaft 94 arranged parallel with and above the shaft- 8G and likewise suitably journaled' within the frame section 69. Herein keyed to; the shafts 89 and 94 are worms 95 and 96 respectively, similar to the worms 29 and 39 in the form of the inven- These worms 95 and 96 through separate and distinct plural predeter mined speed transmission mechanisms generally designated 97 and 98 and which in the present instance are identical to the plural speed transmission mechanisms 31 and 32 described above, and each comprises coaxial fast and slow speed worm wheels 99 and ice controlled by multiple disc clutches 101 and 102 respectively.-

Therefore since these mechanisms are the same as those previously described, a repetition of the description of the same is thought unnecessary other than to state that the haulage drums 72,

73 may be rotated either separately or simul taneously in a direction to wind in their respective cables'at relatively high speed or at relatively low speed and that these haulage drums may rotatein unwinding direction under various degrees of frictional resistance or without such resistance. Various modes of operation of both forms of the improved mining machine will be clearly apparent to those skilled. in'the art and as the method of use of a room and pillar mining machine is well known; further description of the operation of the machine is thought unnecessary.

As a result. ofv thisinvention it will be observed.- that an extremely low, comparatively short, compact machine is produced and one which is accordingly well adapted tousein the lowest commercially workable veins of coal. Furthermore this improved construction enables an extremely compact machine to be obtained wherein the length thereof is reduced to a minimum, the improved feed mechanism and the novel compact arrangement of the driving gears and haulage drums on the mining machine reducing the dimensions of. the machine to a minimum. Furthermore by arranging the haulage drums in the novel manner disclosed and by providing the improved arrangement of the transmission mecha-' 1115111 for'driving the haulage drums and the cutthe driving mechanism for'the haulage drums being substantially identical in construction, thereby reducing the number of different parts with the resultant decrease in the cost of manufacture and replacement. These and other uses and advantages o f'the improved mining machine will be clearly apparent to those skilled in the art. While there is in this application specifically described two forms which this invention may assume in practice, it will be understood that these forms of the same are shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

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

1. In a mining machine, a machine frame adapted to rest upon and slide in any direction over the mine floor, a horizontal motor carried by said frame having its power shaft extending longitudinally of the machine, cutting mechanism driven from one end of said motor including a kerf cutter projecting forwardly from said frame, and feeding mechanism driven from the same end of said motor dncluding relatively rotatable feed operating and controlling members disposed with their axes parallel to a transverse'vertical plane and disposed wholly above the uppermost plane of said kerf-cutter, said members each adapted to cooperate directly with flexible feeding means, and mechanism for effecting rotation of said members either separately or simultaneously at relatively high speed or at relatively low speed whereby one member may be driven at a relatively low speed while the other member is simultaneously driven at a high speed.

2. In a mining machine, a machine frame adapted to rest upon and slide in any direction over the mine floor, a horizontal motor carried by said frame having its power shaft extending longitudinally of the machine, cutting mechanism driven from one endof said motor including a kerf cutter projecting forwardly from said frame, and feeding mechanism driven from the same end of said motor including relatively rotatable feed operating and controlling members disposed with their axes parallel to a transverse vertical plane and disposed wholly above the uppermost plane of said kerf-cutter, said members each adapted to cooperate directly with flexible feeding means, and mechanism for effecting rotation of said members either separately or simultaneously inoa direction to draw inltheir respective flexible feeding meansat'relatively high speed or at relatively low speed whereby one member may be driven at a relatively low speed while the other member is simultaneously driven at a high speed.

3. In a mining machine, a machine frame adapted to rest upon and slide in any direction over the mine floor, a horizontal motor carried by said frame having its power shaft extending longitudinally of the machine, cutting mechanism driven from one end of said motor includinga kerf cutter projecting forwardly from said frame, and feeding mechanism driven from the same end of said motor including relatively rotatable feed operating and controlling members disposed on vertical axes in adjacency with the rearward end of the kerf cutter and in planes above the plane of said kerf cutter, said members each adapted to cooperate directly. with flexible feeding means, and mechanism for effecting rotation of said members either separately or simultaneously in a direction to draw in their respective flexible feeding means at relatively high speed or at relatively low speed whereby one member may be driven at a relatively low speed while the other member is simultaneously driven at a high speed. I

4. In a mining machine, 'a machine frame adapted/to rest upon and slide in any direction over the mine floor, a horizontal motor carried by said frame having its power shaft extending longitudinally of the machine, cutting mechanism driven from one end of said motor including a kerf cutter projecting forwardly from said frame, and feeding mechanism driven from v the same end of said motor includingrelatively rotatable feed operating and controlling members disposed on parallel vertical axes in adjacency with the rearward end of tierf cutter and in planes above the plane of said irerf cutter, said members each adapted to cooperate directly with flexible feeding means, and mechanism for effecting rotation of said members either separately or simultaneously in a direction to draw in their respective flexible feeding means at relatively high speed or at relatively low speed whereby one member may be driven at a relatively low speed while the other member is simultaneously driven at a high speed.

5. In a mining machine, a machine frame adapted to rest upon and slide in any direction over the mine door, a motor carried by said frame having its power shaft extending longitudinally of the machine, cutting mechanism driven from the forward end of said motor including a kerf cutter projecting forwardly from said frame, and feeding mechanism driven from the front end of said motor including relatively rotatable feed operating and controlling members disposed at the forward end of the machine on axes parallel to a transverse ve cal plane and overlying the rearward portion of said kerf cutter, said members each adapted to cooperate directly with flex ble feeding means and mechanism for rotating said members either separately or simultaneously in a direction to draw in their respective flexible feeding means at relatively high speed or at relatively low speed whereby one member may be driven, at a relatively low speed while the other member is simultaneously driven at a high speed.

6. In a mining machine, a machine frame adapted to rest upon and slide in any direction over the mine floor, a motor carried by said frame and having its power shaft extending longitudinally of the machine, kerf cutting mechanism driven from the rear end of said motor including a kerf cutter projecting forwardly from said frame, and feeding mechanism driven from the rear end of said motor including relatively rotatable feed operating and controlling members disposed at the rear end of the machine on vertical axes and in p" lies above the plane of said l2 kerf cutter, said members each adapted to cooperate directly with fiexible feeding means, and mechanism for rotatin said members either separately or simultaneously in a direction to draw in their respective flexible feeding means at relatively high speed or at relatively low speed.

7. In a mining machine, machine frame adapted to rest upon and slide in any direction over the mine bottom, lrerf cutting mechanism carried by said fr me including a horizontally projectin kerf cutter, and feeding mechanism including relatively rotatable feed operating and controlling membersdispcsed on vertical axes and rotating in planes above the plane of said lrerf cutter and each adapted to cooperate directly with flexibly feeding 3 cans, and. motor operated driving mechanism for said members whereby one member may driven at a relatively low speed while the other member is simultaneously driven at a relatively high speed.

8. In a mining machine, a machine frame adapted to rest upon and slide in any direction over the mine bottom, kerf cutting mechanism carried by said frame including a horizontally projecting kerf cutter, and feeding mechanism including relatively rotatable feed operating and controlling members disposed on vertical axes and rotating in planes above the plane of said kerf cutter and each adapted to cooperate di rectlywith flexible feeding means, and mechanism for rotating said members either separately or simultaneously to draw in their respective flexible feeding means, and motor operated driving mechani n. said members whereby one mem ber riven at a relatively low speed while the other member is simultaneously driven at a relatively high speed.

9. In in ng machine, a machine frame adapted to rest upon and side in any direction over the mine bottom, kerf cutting-1n chanism carried by said frame including a horizontally projecting kerf cutter, feeding mechanism including relatively rotatable feed operating and controlling membo o; :os'ed on ver ical axes and rotating in planes above the of said kerf cutter and each adapted to cooperate directly with flexible feeding means, and mechanism iorrotating said members either sep tely or simultaneously to draw in veflexible'feeding means at relativel: igh speed or at relatively low speed, and motor operated mechanism for said members whereby one member be driven at a elatively low speed while the other member is simultaneously driven at a relatively high speed.

10. In amining machine, a machine frame adapted to'rest upon and slide in'anyudirection over the mine floor, a motor disposed at the rear end of said'frame and having a power shaft extendin longitudinally of the machine, kerf'cutting mechanism driven from the forward end-of said motor including a kerf cutter projecting forwardly from said frame/and feeding mechanism driven from the forward end of said motor including relatively rotatable feed operating and controlling members disposed on axes parallel to a transverse ver ical plane and at the forward end of the machine and overlying the rearward portion'of said kerf cutter, said members each adapted to cooperate directly with flexible feeding means, a separate and distinct plural speedv transmission mechanism for each member whereby said members may be independently rotated t a plurality of predetermined speeds."

1l.ln mining machine, a machine frame 7 ting mechanism driven from'the forward end of.

said motor including a kerf'cutter projecting forwardly from said frame, and feeding mechanism driven from the forward end of said motor including'relatively rotatable feed operating and controlling members disposed on vertical axes at the forward end of the machine and in planes above the plane of said kerf cutter, said members each adapted to cooperate directly with flexible feeding means, a separate and distinct plural transmission mechanism for each member whereby said members may be independently rotated at aplurality of predetermined speeds.

12. In mining machine, a frame carrying a rearwardly .l cated horizontal motor and slidable in any direction. overt-he mine floor, said motor having its power shaft extending longitudinally of the machine, cuttingmechanism driven from the forward end of said motor power shaft including a forwardly projecting lierfcutter, and feeding mechanism driven from the forward end of said motor power shaft including relatively rotatable feed operating and controllingmembers arranged at the forward end of the machine on axes parallel to a transverse vertical plane and ten and feeding mechanism overlying the rearward portion of said kerf cutter, said members each adapted to cooperate directly with flexible feeding means, and mechanism for effecting rotation of said members either separately or simultaneously at relatively low speed or at relatively highspeed including for each member fast and slow predetermined speed transmission mechanism through which it, but not the other room oer, is driven.

1 In a mining machin a frame carrying a rearwardly located horizontal motor and slidable'in any direction over th mine floor, said motor having power shaft extending longi t dinally of the machine, cutting mechanism on from the forward end of said motor power shaft including a'forwardly projecting kerf cutdriven from the forward end of said motor power shaft including its.

relatively rotatable feed operating and controlling members ar ange at the forward end of the machine on parallel toatransversc vertical plane and overlying the rearwards portion of said kerf cutter, members each adapted to cooperate directly with flexible feeding means, and mechanism for effecting rotation of said members either separately or simultaneously in direction to draw in their respective flexible feeding at relatively lowspeed or at relatively high speed including for each-member fast and slow predetermined speed transmission mechanism through which it, but not the other member, is driven. V

14. In a mining machine, a frame carrying a rearwardly located horizontal motor and slidable in any direction over the mine floor, said motor having its power shaft extending longitudinally of the machine, cutting mechanism driven from the forward end of said motor power shaft including a forwardly projecting kerf cutter, and feeding mechanism driven from the forward end of said motor power shaft including relatively rotatable feed-operating and controlling members arranged at the forward end of the machine cn axes parallel to a transverse vertical plane and overlying the rearward portion of said kerf cutter, said members each adapted to coopcrate directly with flexible feeding means, and

high speed incl ing fdr'each member fast and slow-predeterm led speed transmission mechanism through which it, but not the other memher, is driven, andcontrol mechanism included in each transmission mechanism member to rotate in a direction to pay out its fie ole feeding means under various degrees of frictional resistance.

15. In a mining machine, a frame carrying a rearwardly located horizontal motor and slidable in any'direction over the mine door, said motor having its power shaft extending longitudinally of the machine, cutting mechanism driven from the forward end of said motor power shaft including a forwardly projecting kerf cutter, and feeding mechanism d iven from the forward end of said motor powershaft including relatively rotatablefeed operating and controlling members arranged at the forward end of the machine on axes parallel to'a transverse vertical plane and overlying the rearward portion of said kerf cutter, said members each adapted to cooperate directly with flexible feeding rneans, and mechanism for eifecting rotation of said members either to permit each draw in their respective flexible feeding means at relatively low speed or at relatively high speed including for each member fast and slow predetermined speed transmission mechanism through which it, but not the other member, is driven, and control mechanism included in each transmission mechanismto permit each member to rotate in a direction to pay out its flexible feeding means undervarious degrees of frictional resistance or without such esistance.

16. In a mining machine, a frame carrying a rearwardly located horizontal motor and slidable in anydirection over the mine floor, said motor having its power shaft extending longitudinally of the machine, cutting mechanism. driven from the forward end of said motor power shaft including a forwardly projecting kerf cutter, and feeding mechanism driven from the forward end of said motor power shaft including relatively rotatable feed operating and controlling members disposed in planes above the plane of said kerf cutter on vertical axes at the forward end of the machine and each adapted; to cooperate directly with flexible feeding means, and mecha nism for effecting rotation of said members either separately or simultaneously at relatively low speed or at relatively highspeed including for each member fast and slow predetermined speed transmission mechanism through which it, but not the other member, is driven.

17. In a mining machine, a frame carrying a rearwardly located horizontal motor and slidable in any direction over the floor, said motor having its power shaft extending longitudinally of the machine, cutting mechanism driven from the forward end of said motor power shaft including a forwardly projecting kerf cutter, and' feeding mechanism driven from the forward end said motor power shaft including relatively rotatable feed operatingandcontrolling members arranged on parallel vertical axes in advance of said motor and in planes abovethe plane of said kerf cutter, said members each adapted to coopcrate directly with flexible feeding means, and mechanism for effecting rotation of said members either separately or simultaneously at relatively low speed or at relatively high speed including for each member fast and slow predetermined speed transmission mechanismj through which it, but not the other member, is driven.

18. In a mining machine, a rearwardly located horizontal motor having its casing resting directly upon and slidable in any direction over the mine floor and its power shaft extending longitudinally'of the machine, the vertical dimension of said motor being only that requisite to its power producing function and substantially determining the height of the machine, cutting mechanism driven from the forward end of said motor power shaft including a forwardly projecting kerf cutter, and feeding mechanism driven from the forward end of said motor power shaft including relatively rotatable feed operating and controlling members arranged at the forward end of the machine on parallel axes in planes above the plane of said kerf cutter and each adapted to cooperate directly with flexible feeding means, and mechanism for effecting rotation of said members either separately or simultaneously at relatively low speed or at relatively high speed including for each member fast and slow predetermined speed transmission mechanism through which it, but not the other memher, is driven.

19. In a mining machine, a rearwardly located horizontalmotor having its casing resting directly upon and slidable in any direction over the mine floor and its power shaft extending longi tudinally of the machine, the vertical dimension of said motor being only that requisite to its power producing function and substantially determining theheight of the machine, cutting mechanism driven from the forward end of said motor power shaft including a forwardly projecting kerf cutter, and feeding mechanism driven from the forward end of said motor power shaft including relatively rotatable feed operating and controlling members disposed in planes above the plane of said kerf cutter on vertical axes at the forward end of the machine and each adapted to cooperate directlywith flexible feeding means, and mechanism for effecting rotation of said members either separately or simultaneously at relatively low speed or at relatively high speed including for each member fast and slow predetermined speed transmission mechanism through which it, but not the other member, is driven.

20. In a mining machine, a rearwardly located horizontal motor having its casing resting directly upon and slidable in any direction over the mine floor and its power shaft extending longitudinally of the machine, the vertical dimension of said motor being only that requisite to its power producing function and substantially determining the height of the machine, cutting mechanism drivenfrom the forward end of said motor power shaft including a forwardly projecting kerf cutter, and feeding mechanism driven from the forward end of said motor power shaft including relatively rotatable feed operating and controlling members arranged in planes above the plane of said kerf cutter on par allel axes at the forward end of the machine, one at the advancing side of the machine and the other at the receding side thereof, and each adapted to cooperate directly with flexible feeding means, and mechanism for effecting rotation of said'members either separately or simultaneously at relatively low speed or at relatively high speed including for each member fast and slow predetermined speed transmission mechanism through which it, but not the other member, is driven.

21..In a mining machine, a frame carrying a rearwardly located horizontal motor and s1idable in any direction over the mine floor, said motor having its power shaft extending longitudinally of the machine, cutting mechanism driven from the forward end of said motor power shaft including a forwardly projecting kerf cutter, and feeding mechanism driven from the forward end of said motor power shaft including relatively rotatable feed operating and com trolling members arranged at the forward end of the machine on axes parallel to a transverse vertical plane and in planes above the plane of said kerf cutter, said members each adapted to cooperate directly with flexible feeding means, and mechanism for effecting rotation of said members either separately or simultaneously at relatively low speed or at relatively high speed including for each member fast and slow prede termined speed transmission mechanism through which it, but not the other member, is driven, each transmission mechanism having a common terminal driving element for transmittin drive to its respective member at both speeds.

CHARLES F. OSGOOD.

CERTIFICATE OF CORRECTION.

Patent No. 1,920,271. August 1, 1933.

CHARLES, F. OSGOOD.

It is hereby certiiied that error appears ,in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 91, for "hauling" read haulage; page 3, line 51, for "880" read 80; and line 56, for "suitable" read suitably; page 4, line 1.38, claim 7, for "flexibly" read flexible; page 5. line 11, claim 9, for "side" read slide; and line 23, of same claim, after "operated" insert the word driving; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 30th day of October, A. D. 1934.

Leslie Frazer (Seal) Acting Commissioner of Patents.

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