US1650027A

US1650027A - Mining and loading machine

Info

Publication number: US1650027A
Application number: US387137A
Authority: US
Inventors: Morgan Olive Eugenie
Original assignee: AMERICAN MORGAN Co
Current assignee: AMERICAN MORGAN Co
Priority date: 1920-06-07
Filing date: 1920-06-07
Publication date: 1927-11-22
Anticipated expiration: 1944-11-22

Description

} E. C. MORGAN MINING AND LOAD-ING MACHINE Nov; 22, 1927.

Filed June '7 1920 Patented Nov. 22, 1927.

UNITED STATES A- O EDMUND C. MORGAN, 01 NEW YORK,,N.

Y.; onrvs nus-Ems woman, nxr'co'rnrx SAID- EDMUND C. MORGAN, 'DE GEAS ED, ASSIGNOR TG MORGAN COM- PANY, OF NEW YORK, N. Y., A CORPORATIQN- OI- SGUTHE DAKGT'AE.

MINING AND LOADING MACH'EWE.

Application filed June 7', 1.920.. Serial No; 387,137.

Myinvention relates to mining and. loading, machines particularly ing and loading coal.

One of the objects of my invention. is the provision of. a mining and: loading-machine particularly adapted coal in low roof mine chambers.

A further object ofthe invention is the provision of mining" mechanism. the upper portion of which can be folded or moved to lower positions sothat the machine may be transported to various places inthe mine through entries having comparatively small overhead space on account oflow roofs.

Another object of the invention is the provisionof an! improved; and: efiicient mining and loading machine comprising anv undercutter and a conveyor associated therewith to receive and transfer toward loading position cuttings from the under-cutter separately from the operation of the conveyer which receives the material dislodged from the mine wall.

Another object of the invention is the provision of mining apparatus comprising, ker cutters and motors on opposite sides of the machine connected to the kerf-cutters for operating the latter.

A further ob ect of the inventionis the provision of spaced-apart upright kerf-cutters each provided with fluid pressure mechanismfor dislodging the cut coal-from the mine wall. a

More particularly it is theobject of the present invention toprovide an improved and eiiicient mining and: loading machine adapted for operation in comparatively low roof mine chambers and; which com-prisesan under-cutter, spaced-apart upright side kerfcutters each provided with fluid; pressure breaking mechanism, motors at the sides of the machine for operating the kerf-cuttcrs and the fluid pressure breaking mechanism combined with loading apparatus andan adjustable pick machine for assisting in dislodging the coal from the mine wall and breaking up the larger bodies of dislodged material into smaller pieces.

Other objects ofthe invention will appear hereinafter, the novel features and combinations thereof being set forth in the appended claims adapted for min for mining and-loading In the accompanying drawings, Fig. 1. is a plan view o-f my improvedminin and loading machine; r Fig. 2 is an elevational view of the mining, and loading machine with the. uppermost parts folded into their lower positions and mounted-on amine car for transportation in a miner Fig. 3 is a sectional; elevation on, the. line 3-3 of- Fig.1 i Y Y .''Fig, 4 is a: sectional; View of Fig.1 on. the line 4-4 looking in the direction of the arrows;

Fig. 5 is a. sectional View. on the line 55 of; Fig. 1. looking'inthe direction of the arrows and v i Fig. 6 is asectional elevationv of Fig. 1: on the line, 66: looking. in the direction bf the arrows.

Referring to Fig. 1, it will. he seen'that the miningand loading machine is mounted in a. pan 7 which: is rectangular inplan view and. 1s PI'OVlClEd with. vertical: sideplates 8 and 9 which act as guideways for the main frame 10.. The mechanism for sliding the main. frame 1.0, together with the mining and loading mechanism monnted-thereon,. longitudinally along the pan. 7, will be hereinafter described.

Secured to the sides of; the frame 10;, as shown in Fig. 5, are two electric, motors 1] and-11 which areconnected together to: act in unison. These electric motors are located intermediate the ends of the machine as shown in Fig; 1. I I. prefer toause. two electric motors at opposite sides oflthe machine so that each may occupy a comparatively low position, and each may be made: smaller than if one electric motor alone were used; In: other words, by the use of two-v spacedapart electric motorsthe: required operating power may bersecured while atthe same time the height of the machine: is materially rednced', thereby enablingtheconstruction odi a mining machine, or of a combined mining and loadingflmachinewhich requires little headroom and can: therefore; operate in mine chambers having comparatively low roots;

The motor shaft 12 is proyidedwith:. a bevel gear pinion*1'3- which meshes with. a bevel. gear 14 on'the transverseshaft 15,)as shown in Fig, 1.. In the same manner the motor shaft 16 on the opposite side of the machine is provided with a bevel gear pinion 17 meshing with a bevel gear 18 on the trans verse shaft 15. The latter is provided with a bevel pinion 19 which meshes with the horizontal bevel gear 20 loosely mounted on a vertical shaft 21; 5n a .hub of the gear 20 is loosely mounted the sprocket 22 in mesh with the chain kerf-cutter illustrated at 23 in Fig. 1. It will thus be seen that when the spaced-apart

electric motors

11 and 11 are operated, power will be transmitted to the undercutting chain cutter 23 to drive the same. I

The undercutter on which the cutterchain 23 ismounted comprises a cutter frame 24 detachably connected to the supporting framework so that when desired the frame 24 maybe removed after two adjacent links of the chain 23 have been disconnected.

' The cutter frame 24 may be supported from the side pieces 25 and 26 byv means of the bolts 27 and 28 extending through, the slots 29 and 30 and provided with nuts 31 and 32, as shown in Fig. 1. In order to adjust the slack in the chain 23, the cutter frame24 may be moved forwardly or rearwardly after the nuts 31 and 32 have been loosened so that the bolts 27 and 28 may slide along the slots 29 and 30. This adjusting IIIGChMIiSHTCOD'lPIlSGS a screw-threaded rod 33 threaded through the rear end of the cutter frame 24, as shown in Fig. 3; The rod 33 is mounted in a bearing in the cross piece 10 which is secured to the main frame 10. A collar 34 secured to the rod 33 holds the latter in the cross frame 10', so that when the .bevel gear 35 is rotated the cutter frame 24 maybe moved forwardly or rearwardly relatively to the frame 10 i and the main frame 10. The bevel gear 35 and consequenti 37 in ly the rod 33 may be rotated by means of a manually operated socket wrench applied at thesquared end'36 of the'shaft 37,there being a bevel. gear 38 at the end of the shaft position to mesh with the bevelgear It should be understood that the parts designated 25 ai1d.26 in- Fig. 1 are rigidly connected-to the main frame which is shown at 10 in- F ig.v '3. By referring to Fig. 6,

which is a sectional view of Fig. 1 on the line 66 looking in the direction of the arrows, itwi'll beseen that the cutter frame 24 is supported in a low position relatively to the positions of attachment of the upright side cutters to the main frame. In other wo'rds,'th e supports 25 and 26 shown in Fig. 1- are located in horizontal planes below the supports for the upright side kerf-cutters.

The upright side kerf-

cutters

39 and 40 are each mounted on the main frame 10 for operation in upright position and for fold ing to the horizontal position shown in Fig.

2" du'ring transportation of the mining and 7 .ing with a bevel loading machine. Inasmuch as the means for connecting the upright side kerf-cutters to the main frame is the same at both sides of the machine, I will describe the details of the supporting mechanism at one side. Re: ferring to Figs. 1 and 3 it will be seen that the upright side kerf-cutter comprises a cut ter frame 41 for receiving the cutter chain 42 which is connected to the sprocket 43. The cutter frame 41 is mounted on the supportin frame 44 the rear end of which is provide with a rod 4.5 projecting through the bearing 46 which is rigidly secured to the frame 10. This rod 45 projects through the rear end of the bearing 46 and is adapted to receive a collar 47 which may be connected to the rod 45 by a pin 48 so that the cutter supporting frame 44 cannot be moved longitudinally relatively to the main frame 10 but may be turned to folded position on the axis of the rod 45. In order to hold the cutter supporting frame 44 in upright position a'bolt 49 may be provided to pass vertically through the supporting frame 44 and screw-threaded into the main frame 10. When the upright kerf cutter is adjusted to operating position and held in adjusted position by the bolt .49 screw-threaded into the main frame 10,

the shaft 52 carried by the supporting frame 44. When the shaft 52 is rotated motion will be transmitted to the bevel gears 53 and 54 to rotate the sprocket wheel 43'and thus drive the sprocket chain 42. Housing may be provided for the protection of the bevel gears 53 and 54. It will also be seen by referring to Fig. 1, that the clutch element 51 is mounted on a shaft 55 the rear end of which is provided with a bevel gear 56 meshgear 57 on the transverse shaft 15.

Therefore, when the spaced-apart sideelectric motors 11 and 11f are operated the undercutting chain cutter, as well as both of the upright side chain kerf-cutters will be driven simultaneously. I

In order to advance the mining machine to effectrectilinear feeding movement of the undercutting kerf-cutter and the spaced apart side kerf-cutters, a rope winding'de vice is provided at 58 for exerting a pull on a rope 59 the free end of which is anchored at 60 to the inner face of thevertical side plate 9 of the pan 7.-

Ill)

' As shown in Figs. 1 and 5 the transverse I 'leys 80 and 81 the worm 65 66 and that on the latter is also mounted the rope drum 58 forreceivingthe rope 59. Power may be transmitted from the worm gear 65 to the rope drum 58 by operating the friction clutch 67. Such operation of the clutch 67 may be efiected by grasping the handle 68 and turning the pressure finger 69 in the bearing 70. I

Limit stop mechanism for automatically limiting the forward feeding movement of the kerf-cutters may be arranged by providing the handle 68 with a lateral projection 71 as shown in Fig. 4, in position to strike against the liniit'stop 72 on the forward portion ofthe vertical side plate 9 of the pan 7 Therefore, "after the clutch 67 has been thrown in manually it may be left in app-lied position but when the kerfcutting mechanism reaches the desired limit of its forward stroke, the limit stop 7 2 will effect an automatic release of the clutch 67 and thereby automatically stop the forward feeding movement of the ltei'frutting mechanism. I In order to retract the kerf-cutting anism along the pan 7., another rope v ing mechanism 7 3 is provided at the oppomechsite side of the machine as shown in Fig.

1, the free end'of the rope 74 being adapted to be anchored at 75 to the inner face of the vertical plate 8 near the rear end of the latter. The mechanism for securing the forward feeding movement may be geared -i so as to be slow in accordance with the feed ing movement desired, whereas the retract ing movement may be much more rapid in order to save time in restoring the machine to its. initial positionin readinessfor another cutting operation. The gearing for operating the rope wind 'ng mechanism '73 is similar to that already described in connection with the rope winding mechanism 58.

The rearward movement of the I mining machine onto the pan 7 may be automatically stopped by limit stop mechanism comprising a vertical hinged stop'block 7 6 projecting upwardly from the side plate 8 at the rear portion of the latter, as shown in Fig. 1, and in position to be engaged by the projection77 of the lever for operating the clutch similar to that shown at 67 in Fig.4 but controlling the winding drum 7 Attached to the pan 7 and extending rearwardly therefrom are as shown in Fig. '1. These supports are provided, respectively, with direction pulfor receiving the rope 74, the free end of which is anchored in suitable positions in the mine. By extending the rope 74 around the direction pulley and anchoriiig the free end of the rope in the mine, the pan 7, together with the mining and loading machine inou'nted thereon may be slid laterally over the mine fioor by opis mounted on a vertical shaft gitudinally. I

windengage the sprocket supports 78and 79,

"main frame 10 is a is mounted on the main frame 10 for swing crating the rope winding apparatus 73. In

order to slide theapparatus int-he opposite directionithe rope 74 may be extended around the pulleys: 80 and 81, itsfree end anchored in the mineand the rope winding mechanism 73 operated. By extending the rope 74 around pulleys 80 and 83 to an an-' chorage the machine may .be slid back lonlVhen it is desired to pull the, pan, .together with the mining and loading machine ther'eom onto the mine car 82 shown in Fig. 2, the rope 74 may be disconnected from its anchorage 75 and extended around the pulley 80 and thence around the pulley '83 which is'mounted centrally at the rear end of the mainframe 10, the free end of the rope being anchored at 84 to the rear end of the truck 82. Now upon 0 eration of the rope-wiiiding apparatus 7 3, t e main frame willbe pulled toward the truck, and by reason of the stop pins at 85 and 86 the pan 7 the main the truck to the rear end thereof to theposition shown in Fig.

Y ;Mounted on the forward portion of the framework is a receiving conveyer 87 occupying'a position in an approximately horizontal plane within the boundary of the forward portion of the undercutter and between the upright side cutters, as shown in Figs, 1 and This conveyor comprises a frame 88 which is detachably mounted upon thenminsuppofiing framework in position to permit the

drivingsprockets

89, 89 to conveyer 90,.as illustrated in Fig. 3. The conveyer extends upwardly on an incline from the forward'horizontal receiving portion and has an upper hoizontal delivery portion as shown in Fig. 8, and. the direction of'rotation of the drivingsprockets 89 is'such as to provide for the slack portion ofthe conveyer to extend in advance of the driving sprockets 89, thereby increasing the lengthof'engagement of the driving sprockets with the sprocket chains and keeping taut the carrying portions ofthe conveyer, as well .as that portiofn'which extends from the rear end of the conveyer to the sprockets 89. Inasmuch as the space above the corn veyer 87 is entirely free and unobstructed this conveyer is entirely detachable and when in operating position it may be retained in place by its own weight resting on the main frame 10 at 91 and 92 and on the cutter frame 24 at 93.

The sprockets 89 are mounted on the transverse shaft 94, as shown in Figs. land will be moved, rearwardly with frame along the upper surface ofv chains ofthe endless 3, and the latter is geared at 95 to. an electric driving motor. 96.

Pivotally connected to the rear end ofthe hopper 97. This hopper extend into the hopper 97 but the central conveyor 100 is longer than the conveyors 99 and 101 so as to extend farther forward as shown at 104 in Fig. 1 so as to be in position to more readily receive the cuttings from the conveyor 1.05 when the conveys-r frame 98 occupies a longitudinal position in alinement with the conveyor 87. The rear endof the conveyer 87 extends over all three conveyors 99,100 and 101. However, even when the conveyor frame 98 is swung from one side to the other, the hopper 97 will maintain delivery comn'iunication between the conveyer 87 and the rear swinging multiple conveyor.

The slack conveyer or the conveyer for receiving the cuttings from the undercutter is detachably mounted on an inclined intermediate portion of the frame 10. The slack conveyor may be self-contained and. detachably mounted on the incline so that when the conveyer 88 is tipped up or removed the slack conveyer may be removed in its ontirety. p

The slack conveyor comprises an endless chain provided with flights movable over a plate 106'on which is mounted an electric motor 107 connected'by the gearing 108, 109 and 110 to the sprocket 111 for driving the chain of the conveyer 105. Provision may be made, as shown at 112, for regulating the tension of the chain of the conveyer 105.

From the foregoing it will be seen that while the two spaced-apart

side motors

11 and 11 are relied upon to transmit power to the undercutter, the side cutters and to the rope drums 58 and 73, separate motors are used for operating the conveyors, one for operating the conveyer 87 another for operating the conveyor 105, and still another for operating the rear swinging multiple conveyer. These various motors may be sepa, rately controlled and operated in a well known'm'anner.

7 Each of the upright side kerf-cutters may be providedxwith hydraulic breaking devices 113 and 114 connected by means of pipes to pumps which are operated by eccentrics on the transverse shaft 15. Inasmuch as the pumping mechanism and the connections between the same and the hydraulic breakers are the same for both of the upright side rerf-cutters, a description of the mechanism located atone side will be sufficient. Re-

ferring to F ig; 1, an eccentric is shown at 115 for operating a pump 116 connected by means of the pipe 117 extending through the coal in maybe supporting frame 44, to the pipe 118 shown in 'Fig. 3.

If desired the pumps 1 16 may be pneumatic and thetransmission of fluid therefrom to; the breakers controlled by a valve 119 shown in Fig. 1. Therefore, the pumps may run idly during the operation of the undercntter and the side cutters until it is desired to effect the operation of the fluid pressure breakers 113 and 114. Then the valves 119 may be operated to direct the fluid pressure from the pumps to the fluid pressure breakers to effect relative expansion of the two parts 120 and 121 shown in Fig. 6. The part 120 will then press against the wall of the unnamed mass and the part 121 will effect breaking down of the cutter between the side cutters and, above the un dercutter. A. spring 122 is provided between is such that the fluid pressure breakers 113 and 114 will be sufiicient to break down the pieces of such sizes as are capable of being handled by the. conveyer 87', butwhen desired thebreaking of the coal'may be assisted by means of. the operation of one or morepick machines mounted on the frames of the

motors

11 and 11. Such pick ma chines are also useful totrim to complete the mining of the coal vein and to provide sufficient clearance forcontinued passage of the-machine into the mine. 7

124 to receive a dove-tail.connection of the support 125 which is connected by a universal joint 1.26 to the frame 127 of the pick machine.

ating handles128 bymeans of which the direction and operation of the pick machine may be controlled. Such pick machine is preferably of the reciprocating "type and slid along the guideways 128v and 124 independently of each other and positionlto which the pick machine is adjusted. -By reason of the, adjustment forwardly and "rearwardly along the guide.

grooves 123 and 124 andiby reason of the universal 101M126 the pick machines may I driven by compressed air through the pipes 129 in any on the roof or Thefluid pressure breakers 113 and 11 i each be used to command the largi'aareaof the mine wallor of the cut material between 1'15 The pick machine is provided with opercupies an elevated position in planes above theconveyer 87, Therefore, when the picks are operated they may command a w de area at the mine wall without lnterfering with 'the operation of the conveyer. The rear ends of the guideways 123- and12 tareprovided with pivoted sections illustrated ,at130 in Fig. .2. This rear section is pivoted at 131 so that it may occupy a downwardlyin- ,clined position after the support has been moved intothe extension130. In other words, by the provision of the rear pivoted section the pick machine may be moved into this pivoted sectionv and then let down into a lower or folded position where it will fit between the motor frame and the conveyer 87. The pick machine frame 127 may be provided with a forwardly extending angle-iron frame 132 for receiving ,the plunger rod 133 of the pick and therefore when the pick machines are lowered to their folded positions these angle-iron frames132 and the rods-133 will occupy the positions illustrated in Fig. fibetween the frames of the motors 11 and11 and the ,conveyer 87. It will thus be seen by reference to Figs. 2 and 5, that when thepick machines are in their lower or foldedpositicnsv they are ap-' proximately level with the upper surfaceof the frames of the motorslland 11 and also approximately at the same-elevation as the rear upper horizontal portion of the conveyor 87. This folding feature of-the pick machines is particularly desirable during transportation of the mining and loading machine on a mine car from one part of the mine to another. a a i V The upright sidecutters may also be folded to lower positions during transportation by loosening the bolts a9 and turning the side cutters on the pivot pins 45. This is illustrated at the right-handportion of -Fig. It should be understood that both of the side cutters may be moved to such folded position and occupy such space as to afford approximately the same headroom as is af-i fo-rded when the pick machines are folded .to their lower positions. :Fig Q'represents both of the side cutters andthe pick -ma ,chines folded to their lower positions so as to reduce theheigli-t of the miningand load' ing .machineto a minimum,thus making provision for transportation on amine car through verylowroof minechambers. v

It should be particularly noted that all of the operating parts of the mining and loading machine hereinbefore described, and-as shown on the drawings, arersymmetrical'ly arranged so as to well balance the operating 'as- 'sliown'in F1g. l, so that when desired -ing mechanism 7 3 to efiect the operation of tion. By providing a hinge for the stop device :76. the clutch for a the, rope winding parts. and the weights thereof as well as the wei ht of the entire iminin and loading madhine. This is true notion with respect to the side cutters and" the parts'inounted thereon and connectedthereto,but also with 11, the rope winding devices. and the '7 respect to the spaced'apar't side, motors '11 an i slack conve er whichgiscentrally located.

It should a sobe observed that two guide grooves123 and 12lareprovided, one on top ofeach of the motors 11 and '11. so that when two pick machines are employed one on each side of the machine, the weights due to the pick machines will also maintain balanced ,weight'jof the entire machine andgits operating parts.

The hinge stop block preferably I mounted on theupperportion of the side plate..8; to swin .on a longitudinal axis 134:,

this ;stop. block mayfbe manually, grasped IIICl mOYQd laterally out of theway of the projection? 7 thus permitting the applica- .tion of thefriction clutch of the rope Windthe latter when desired. After the mining and loading machine has been ,moved rearwardly alongthe pan 'f and automatically stopped by the, stop motion mechanism comprisingxthe partsffi 'and 7 7,:liti may-be ,der sired .-to extend, the rope 74 to anchorages in the mine as hereinbefoiedescribed so. as to shift the pan 7. together with the mining-and loading machine thereomgto aidesired locamechani'sm 7 3 may 1 be applied without; first moving the mining and loading machine. forwardlyv along the pan @becauseyas Soon as the stop76 is moved -la-terally, it" is lfreed from the projection 77 iand the clutch-quay thenbe ap.plied.,j

should also. be noted that the vspace ;be low the slackconveyer lOo may beprovided with a closed compartment 'l35 for' receiving 1-;

compressed airfor'operating the pickanachines. The compressed air stored the compartment may be conveyedtoqthe pick machines through thefoutlet pipe 129' and-the flexible. pipe 129. l The use of this compartment 135 for thestorage ofv compressed air for operating the pick machines, does notinterfere with theiarrangement or operation of the other parts of the mining and loading machine. .It ispreferable; to 'use the --compartment 135 for; suchpurpose v to secure compactness and-economy of available space i l Obviously those skilledin the art may -make various changes in thedetails and arl rangements of partswithout departing. from the spirit and scope/Ofmy invention as"d'efined by; the claims hereto appended, and I wish, therefore, not, to be restricted to the precisev construction herein disclosed. .7

Having thus fully disclosed an embodimentof my invention, what I desire to se cure by Letters Patent -of the United States, is

1'. In a mining machine, the combination with a main frame, of an undercutting kerfcutter mounted on said frame, spaced-apart upright kerf-cutters onthe forward portion of said frame, and balanced and symmetrically arranged power transmission mechanism comprising spaced-apart motors at the sides of said frame for driving said kerfcutters. p

' 2. In a-mining machine, the combination with a base frame adapted to rest on the floor of a mine chamber, of a main frame carried by and movable along said base frame, a horizontally arranged cutter mounted on said main frame at the forward end "thereof, vertically arranged cutters mounted on opposite sides of'the main frame at the forward end thereof, said cutters being adapted to operate in advance of said' main frame, means on said main frame in position to receive material when dislodged from the space between said vertically arranged cutters above said horizontally arranged cutter, means for driving said outters, a pair of rope drums mounted on 0pposite-sides of said receiving means to rotate on vertical axes, and a pair of ropes wound respectively on said rope drums and adapt edto have their free ends anchored to said 7 base frame to secure feeding movement of at the bottom of said supporting frameand mounted at the sides of the latter to rotate on vertical axes with the ropes close to the bottom of said flanges while extending to anchorages fixed relative to said base'frame, and means for operating said rope winding mechanism to secure feeding movement of said kerf-cutting mechanism by movement of said supporting frame along said base frame. 55

with 'a pan having spaced-apart longitudinal 'guideways, of a-supporting frame mounted 4. In a mining machine," the-combination in said pan and movable longitudinally along the same, min ng mechanism mounted on the forward end'of said supporting frame, means for driving said mining mechanism, and rope winding mechanism comprising a palr of rope drums mounted at the bottom of said pan adjacent the lateral edges of the pan on vertical axes and ropes extending from the peripheries of said rope drums along the said'lateral edges and along the bottom of the pan to anchorages at the sides of said pan for moving said supporting frame longitudinally along said pan to effect feeding movement of said mining mechanism and-the retraction thereof. i v 5. In a'mining machine, the combination with an elongated supporting frame, of mining mechanism mounted thereon to slide along the same, means for drivin'gsaidmina ing mechanism, and two ;rope.winding -de-' vices each pivotally mounted to occupy posiof said frame, mining mechanism mounted on said frame, means for driving said mining mechanism, and limit stop mechanism for automatically stopping and limiting the movement 'of the mining mechanism.

7. In a mining machine, the combination with a pan adapted to reston and slide over a mine floor, of 'a supporting'framemounted on said pan for movement longitudinally thereof, mining mechanism mounted on said frame to move "bodily therewith, means for driving said mining'mechanism, rope winding mechanism for feeding saidmining mechanism and comprising rope winding drumson opposite sides of said frame in position to pay out ropes along the edges of said frame and said pan, and limit stop. mechanism for automatically stopping and limiting the forwardfeeding movement of said mining mechanism. a

8. In a miningmachine, the combination with a base frame,-of a supporting frame ,mounted thereon to move along the same, (cutting mechanism mounted on the forward end of sald supporting frame, means for driving said cutting mechanism, rope, winding mechanism comprising a rope drum I mounted with its periphery at oneside'of said frames to payout a rope along one edge of said base frame, 'saidirope being adapted to have its free'end anchored to said base frame, means for operating said rope winding mechanism to effect forward feeding movement of said cutting mechanism,

and limit stop mechanism for stoppin'g and limiting the forward feeding movement of said cutting mechanism. I I

tions at the bottom of said supporting mov able back and forth along said bed frame between said flanges, kerf cuttingrmechan sm' mounted on the forward end of said carriage, means for drivingsaid kerf cutting mechanism, rope winding mechanism comprising rope drums-mounted on said carriage in position to pay out ropes along the bottom sides of said bed frame and near said uprightfianges, and -means for operating said rope winding mechanism when the free ends of the ropes on the rope drums are anchored, to advance and retract the carriage with said kerf cutting mechanism along said bed frame. 7

10. In a mining maclnne, the combination I with a. base frame, ofa supporting frame movable along said. base frame, cutting mechanism mounted on said supporting frame, means for driving said cutting mechanism, a pair of rope winding devices mounted on opposite sides of said supporting frame and comprising rope drums adapted to pay out ropes to extend along the opposite longitudinal edges of said base frame, and means for automatically stopping and limiting the travel of said supporting frame along said base frame in both directions.

11. In amining machine, the combination with a base frame, of a main frame mounted thereon and movable therealong, kerf-cutting mechanism mounted on the forward end of said main frame, means for driving said lierf-cutting mechanism, means for. feeding said kerfrutting mechanism, rope winning mechanism comprising a rope drum with a friction clutch associated with the upper side thereof, said rope winding mechanism comprising a rope adapted to have its free end anchored to said base frame to secure re traction of said main frame to move said kerf-cutting mechanism back from the mine wall, and means for automatically stopping said rope winding mechanismby lifting said clutch to limit the retracting movement of saidkerf-cut-ting mechanism. I 152. In a mining and loadmgmachine, the

combination with a base frame, of a main frameunounted on said .base frame and movable along guideways thereon, a horizontal undercutter and spaced-apart up right side cutters mounted on the forward end of said main. frame, means for driving said cutters, rope winding mechanism mounted on one sideof. said mainframe and comprising a'rope with its free end anchored to the forward portion of said base frame, means for operating said rope wind,- ing -mechanism to secure forward feeding movement of said cutters by movement of said main frame along said base frame, additional rope winding mechanism mountsite-sides of said supporting s'pacedapart direction base frame, means for operating said additional rope winding mechanism to secure rearward mov'ement of sa1d ma n frame along said base frame to retract said cutters fromthe mine wall, and loadingapparatus associated with said cutters to receive dis lodged material and transfer the same along said main frame toward therear end thereof into position for loading into mine cars. 13. 'In a miningand loading machine, the combination with a pan having vertical spaced-apart :side plates extending longitudinally thereof, aniain frame mountedcin said pan andguided along the latter between said side plates, as undercutting kerfe cutterand upright spaced-apart side kerfcutters mounted on the forward end; of said main frame and movable, bodily with the latter, loading 'appar'atusucomprising a convey'er having a receiving portion associated with said cutters in positionto receive dislodged material directly from the mine wall,

rope-winding mechanism mounted on one s de of said mainframe and comprising. a rope with its free end adapted to. beanchored to the forward portion of one of said side plates, means for driving said undercutting kerf-cutter-and said side kerf-cutters, means for operating saidrope-winding mechanism to secure forward feeding movement of said kerf'cutters by the bodily forward movement of] said main frame along said pan, additional r'ope winding mechanism mounted on the other side of said mainframe and comprising a rope adapted to have itswfree end anchored to the rear portion of the other side plate of said pan, and means for operating said additional roperwinding mechanism to secure rearward 1n'ovement of said main frame along said pan and the withdrawal of said kerf-cutters from the mine wall.

1a. In a mining machine, with a base frame having upright longitudinal flanges, of asupportingframe movable the combination longitudinallyof said base-framebetwecn said flanges, cutting mechan sm mounted on the for-ward end ofzsaid supporting frame, ,means for driving said cutting anechanism, feeding mechanism for said cutting mechanism comprising rope drums on the oppoframe with the peripheries of said rope drums in position topay: out :ropes along the bottom of said base frame nearsaid flanges to anchorages,

pulleys located at the rear end of said base frame, and. an additional direction pulley at the rear end of said supporting framezintermediate the sides thereof, said directioi'i pulleys being adapted to receive the ropes'from'said winding mech anisms Y 15. The combination with a mining machine comprising a main frame, of a rope directing device occupyingv a middle position at therear end of said main frame, a base frame for receiving said mining machine, an additional: rope directing device for the rear end cf'said base frame, means mine car into position for transportation.

16. The combination with a mining machine comprising a main frame, of a base frame having guideways for said main frame, a pair'of rope directing devices at the rear end of said base frame and at opposite sides thereof, an additional rope directing deviceat-the rear end ofsaid main frame, rope winding mechanism mounted on said main frame and comprising a rope adapted'to have its free end anchored either to the base frame or distant therefrom, and means for operating said rope Wvinding mechanism for moving said mining machine along said base frame when the free end of said rope is anchored to'said base frame and for shifting said base frame together with said mining machine when said rope is extended around one ormore of said rope directing devices and its free end anchored distant from said base frame.

17. The combinationwith a mining machine comprising a main frame, of a base frame for supporting said mining machine, rope winding mechanism mounted on said main frame and comprising a rope with its free end adapted to be anchored to said base frame, a clutch for controlling said rope winding mechanism, a hinged stop on said base frame, means in positionto engage said: stop to automatically release said clutch and limit the movement of said mining machine along said base frame, and means for operating said rope winding mechanism to effect movement of said mining machine along said base frame when the free end of said rope is anchored to said base frame and for moving said. base frame together with said mining machine when said hinged 'stop is moved to one side to permit the application of said clutch and when the free end of said, rope is anchored distant from said base frame.

18. In a mining machine, the combination with a main frame, of a horizontal undercutting kerf-cutter on the forward portion of said frame, spaced-apart upright kerfcutters on the forward portion of saidframe,

power transmission mechanism comprising spaced-apart motors at theopposite sides of said main frame. for driving said kerf-cuttors. 2 7

19. In a mining machine, the combination with a main frame, of a pair of motors having parallel shafts extending longitudinally of said frame at the sides thereof, a trans verse shaft, gearing for transmittingpower from said motors to said transverse shaft, an undercutting vkerf-cutter mounted on'the forward end of said main frame, and means for transmitting power from said transverse shaft to said undercutting kerf-cutter.

:20. In a mining machine, the combination with a main frame, of a pair of spaced-apart motors mounted on said main frame on opposite. sides thereof in relatively low positions adjacent the lower surface of said main frame and extending longitudinally thereof, a transverse driven shaft operatively connected to said motors, an undercutting kerfcutter mounted on the forward main frame,and means at the central portion of saidtransverse shaft for transmitting power to said undercutting kerf-cutter.

21. In a mining machine, the combination with a main frame, of mining mechanism mounted thereon, means comprising a motor for operating said mining mechanism, and a pick machine mounted on top of saidmotor in position to break up material adjacent said mining mechanism.

22. In a mining machine, the combination with a supporting frame, of a pick ma-' chine mounted thereon, and collapsible mechanismconnected between said pick machine and saidsupporting frame for permitting movement of said pick machine'to a relatively low position when not in operation.

end ofsaid ioo 23. In a mining machine, thecombination with a supporting frame, of a conveyer 8X- tending longitudinally thereof, a pair ofv pick machines one mounted on-one side of said conveyer and the other mounted on the other side thereof, and means for supporting said pick machines in relatively low positions on opposite sides of said conveyer when said pick machines are out'of-opera'- tion and for directing said pick machines to elevated positions for operation.

' 24L. In a mining machine, the'combination with a supporting frame, of a guidewaypiv oted thereto, a pick machine, and a supple,-

mental support between said pick machine and said guideway for directing the pick machine to a relatively low positionwhen out of operation and for supporting said,

pick machine in an elevated position during operation'when said supplemental support is moved from said .guideway onto said frame.

25.. Ina mining machine, the combination with a main supportingframmof a supplemental support movable into position on sat mam frame, a pick machine mounted on sa1d supplemental, support, and a guideway pivtion, and a pick machine mounted on said' supplemental support to occupy an elevated position on the tired section ofsaid guiding mechanism and to occupy a relatively low position when said supplemental support is on the pivoted section and the latter is tilted 27. In a mining machine, the combination with a main frame, of mining mechanism mounted thereon, a motor,-mea'ns connected between said motor and said mining mocha latter, a guideway ex nism for driving the of said motor, and a tending longitudinally pick machine mounted on said motorfor longitudinal adjustment along said guideway. I

28. In a mining with a main frame, mounted thereon, tors on said main frame and operatively connected to said mining mechanism, longitudinal guides one on top of each of said motors, and a pick machine adapted to be mounted on top of either of said motors for adjustment along the guideway on top thereof.

29. In a mining machine, the combination with a main frame, of a guideway extending longitudinally thereof, a slide block mov able along said guideway, and a pick ma chine universally mounted on said slide block.

30. In a mining and mach i re, the combination of mining mechanism loading machine, the combination with a conveyor, of a main frame for supporting said conveyor, said main frame comprising a casting integral therewith and provided with a compartment under said conveyor adapted to store compressed air in an available space under said conveyor, of a pick machine mounted on said main frame, and a connection between said compartment in said casting and said pick machine for directing compressed air from said compartment to said pick machine.

31. In a mining machine, the combination with a traveling conveyor, of a supporting frame for said conveyor and comprising a casting integral therewith and provided with a pair of spaced-apart mo-- on a longitudinal otally supporting I a compartment under said conveyor adapted to store compressed air, a pick machine adjustably mounted on said main frame, and a flexible connection between saidpick machine and said compartment for directing compressed. air to said pick machine.

' 32. In a mining machine, the combination with a mainframe, of an uprlght kerf-cuttor, means for driving said kerf cutter, and mechanism for supporting said kerf-cutter in upright position relative to said main frame during operation of said kerf-cutter and forpermitting the folding of said kerfcutter on .a longitudinal axis parallel to the longitudinal center line of the machine but spaced laterally therefrom so that said .kerfcutter may occupy a relatively low position when out of operation without disconnecting the kerf-cutter from said mainframe.

'33. In a mining machine, the combination with a supporting frame, of an upright kerfcutter comprising a cutter frame, means for pivotally connecting said cutter frame; to said supporting frame for movement relatively theretoon a longitudinal axis'extending through the-plane of said cutter frame to permit the movement of said'kerf-cutter to a horizontal or folded position, and means forsecuring said cutter frame to said main frame to occupy an upright position while in operation, a l

' 34. In a mining machine, the combination with a main frame, of power transmission mechanism comprising a clutch element mounted' on said main frame, a kerf-cutter comprising a cutter: frame, means: for pivotally connectingsaid cutter frame to said main frame for movement relatively thereto axis to permit change of position of said kerf-cutter from an upright operating position to a horizontal folded position, means in fixed position relative to the main frame when said kerfcutter is in upright position,

and additionalpower transmission mechanism between saidkerf-cutter andthe firstnamed power transmission mechanism,isaid additional power transmission mechanism comprising another clutchelement in alinement with the first named clutch element when said 'kerf-cutter is in upright position.

35. In a mining machine, the. combination with a main frame, of a kerf-cutter comprising a cutter frame, a motor on the main frame, powertransmission mechanism partly on the main frame and partly on said cutter frame and comprisingone clutch element on the main frame and, another on said cutter frame adapted to be completely separated but located on alined shafts when said kerfcutter is infupright position, means for pivosaid cutter-frame for swinging movement relative, to said main frame on longitudinal axis,-

for holding cutter frame and means for a securing said cutter frame to said main frame when'said kerf-cutter is in upright position.

In a mining machine, the combination with a main frame, of spaced-apart side lrerfcutters each pivotally connected to said main frame to swing relatively thereto on longitudinal parallel axes from upright position to approximately horizontal folded position,

i and means for transmitting power to drive ter frame, a pivotal connection at the cutter frame and between the latter and said supporting frame to permit movement of said l rerf-cutter on a longitudinal the cutter frame relatively to said supporting frame from an upright'shearing position to an approximately horizontal folding relation with said supporting frame, said longitudinal axis being located adjacent the cutterframe both when the cutter is in upright cutting position and when in folding p0sition, and powertransmission mechanism connected between said supporting frame and said kerf-cutter.

38. In a minin machine, the combination with a supporting frame, of an undercutting kerf -cutter mounted on the forward end thereof, 'an upright shearing kerf-cutter comprising a cutter frame, a rock shaft extending rearwardly from the lower portion of said cutterframe to support the said shearing kerf-cutter for tilting movement to a folding relation with said u'ndercutter and said supporting frame, and powertransmission mechanism between said supporting frame and said shearing; kerf-cutter to drive the latter when in upright position.

In a mining machine, the combination with a supporting frame comprising a castin}; integral therewith and provided with a compartment at it'sbottom adapted to store compressed air, of a pick machine mounted on said supp'ortingframe, and a connection between said. con'ipartment in said casting and said pick machine for directing compressed air from said bottom compartment to said pick machine,

40; In a mining machine, the'combination with a supporting frame, of an undercutting kerf-cutter mounted on the forward endthereof,a multiple conveyor mounted on the rear end thereof, and a symmetrically arranged intermediate conveyer for receiving the cuttings from said kerf-cutter and trans- 'ferring such cut-tings to said multiple conveyer.

4-1. In a mining and loading; machine, the combination with a, supporting frame, of a ,pair of motors mounted on said frame to extend longitudinally thereof, one on one said side of said frame and the other on the other side thereof, an undercutting kerf-.

sition to r .ceive material dislodged adjacent said cutting mechanism, arear swinging conveyor for receivingdislodged material from said main conveyer, and a symmetrically arranged additional conveyer in position to receivethe cuttings from said ke-rfcutting mechanism independently of said main conveyer and transferring such cuttings to said swinging conveyer' independ ently of the. transfer of dislodged material by said main con'veyer toveyer.

4L3. In a mining andloading machine, the combination with a supporting frame, of an undercutting kerf-cutter, spaced-apart upright side lierf-cutters, a balanced system of power transmission mechanism comprising meters on opposite sides frame for drivingsaid lrerf-cutters, and

said swinging con 7 of said supportingloading apparatus comprising a COZLVQYQL extendingfronithe range of operation of said'lierf-cutters longitudinally of said supporting frame and between said motors.

4%. In a mining and loading machine, the combination with a supporting frame, of an undercutting kerf-cutter, spaced-apart upright side ke'rf-cutters, loading; apparatus comprising a conveyor extending longitudinally and symmetrically along said: supportingframe, a pair of motors one mounted on one side of said supporting frame and the other on the other side thereof at opposite sides of said conveyer, and power transmission mechanism between said motors and all of said lrerf-cutters for driving the latter simultaneously upon the operation of said motors. I

In a mining and loading machine, the

combination with a supporting frame, of an undercutting kerf-cutter, spaced-apart upright side kerf-cutte-rs, loading apparatus extending longitudinally and centrally of said su 'iporting frame, and a balanced system of symmetrically arranged power transn'iission mechanism comprising motors on opposite sides of the machine for kerf-cutters thereof.

operating In a mining and loading machine, the

combination with a supporting frame, of an undercutting kart-cutter mounted on the in cludin the feedim b C 'veyer the conveyer way between the motors is no forward end thereof, a pair of motors mounted on opposite sides of said frame on the bottom thereof, a main conveyer extending rearwardly along aspace located directly between said motors, and a supplemental conveyer under said mainlconveyer and extendin rearwardly from a receiving position adjacent the rear cndof said kerfcutter. V I

In a mining and loading machine, the combination with a supportingframe, of a kerf-cutter mounted on the forward port-ion thereof, a. rear swinging conveyer having a hopper 0n the forward end thereof, a forward conveyer extending from said kerfcutter rearwardly to said hopper, means comprising motor mechanism for operating said kerf-cutter, a separate motor for driving said forward conveyer, another separate motor for driving said swinging conveyer, an additional conveyer under saidforward conveyer for receiving cuttings from said kerf-cutter and delivering such cuttings-to said hopper, and a separate motor fordriv ing the cuttings conveyer.

48. In a mining and loading machine, the combinatlon with a bed frame, ofa carriage mounted thereon for advancing and retracting movements, an undercutting kerf cutter on the forward end of said carriage, a travcling conveyer having, a. receiving end adapted to enter the kerf producedby said kerfci'itter, means for dislodging the material above the under kerf onto, said conveyer, a supplemental conveyerunder said firstnamed conveyer in position to gatherthe cuttings from said kerf-cutter and movethe same re-arwardly, and means comprising motor mechanism at the bottom of saidcarriage and at the sides of the rear portion of said first-named conveyer for operating 7 said kerf-cutter and said dislodging, means while the space above the first-named conremains free and unobstructed s and higher than the height of said motors.

4L9. In a. mining nachme, the combination 50. In a mining and low roof mine chambers, the combination with a supporting frame, of an undercutting kerf-cutter, spaced apart upright side kerfe cutters,'means for connecting said 'i 'pri'ght side kerf-cutters to said l'su'pportingj frame to permit movement ofsaid cutt'ers to app erim el' he i e leedr ritns with asupport-mg frame, of mining mechaloading machine for I J-II.

balanced and symmetrically arranged power transmission mechanism comprising spacedapart motors at the sidesof said supporting frame fordriving said kerf-cuttersa pick machine, means for supporting said pick machine in elevated position for operation on the material between said side cutters and above said undercutter, means for supporting said pick machine in a relatively low position or folded position, and loading apparatus comprising a conveyer extending from said kerf-cutting mechanism rearwardly between said motors and toward loading with arframe having a flat bottom adapted to besupported adjacent the mine .floor, of a pair ofsymmetrically arranged motors on opposite sides'of said frame and secured to the bottom thereof, a horizontal undercutting kerf cutter on the forward portion of said frame, spaced-apart upright kerf cutters on the forward portion of said frame, and means for driving said kerf .Tcutters from said low-positioned motors... I

53. In a mining machine, the combination with -a supporting; frame having a bottom adjacent the mine floor, of mining mechanism mounted thereon, means for driving said mining mechanism,-and two rope windingdevices each pivotally connected to said bottom on opposite sides of said frame on upright axes to have their outer sides adacent the longitudinal edges of said frame. 54. In a miningmachine, the combination with a main frame comprising a casting having a compartment for storing compressed air and an inclined plane on its outer surface, of an undercutting kerf cutter, means operated by said compressed air for breaking down the coal, above said kerf cutter,

and a conveyer mounted on said inclined I plane for receiving the cuttings from said kerf cutter and transferring such cuttings toward loading position.

55.'In a mining machine, the combination with a main frame having a flat bottom adapted to be supported adjacent the mine floonsaidfraine also comprising a casting the compressed air from said compartment for dislodging material above said under cutter, and a conveyer mounted on top of said compartment for receiving cuttings from said kerf cutter and transferring such cuttings 'rearwardly toward loading position.

56. A loading machine including a truck, a carriage mounted for reciprocating movernent, anelevating conveyer mounted on said carriage by which the material to be loaded is taken up, a hopper pivoted vertically on the carriage into which the elevating conveyer discharges, a loading eonveyer carried by the pivoted hopper taking the ma terial from said hopper extending to discharge to the point of loading, rope winding mechanism on said carriage, a rope connected thereto and wound thereon, and a guide at the rear center of said carriage for directing the rope to an anchorage on said truck.

57. A loading machine adapted for load ingto a car located adjacent the machine,

including a truck, a carriage mounted for advancing and return movement, an elevating conveyer mounted on said carriage to take up material as the carriage is advanced, a hopper 0n the carriage into which the elevating conveyer discharges, a loading conveyer associated with said hopper to take the material from the hopper and to load and distribute the material within the car as the carriage-is advanced, rope winding mechanism on said carriage, a rope con- 'nected thereto and wound thereon, and guides comprising a guide at the rear center of said carriage for directingthe rope to an anchorage on said t'ruclr.

58. 111 a mining machine,the combination with a main frame, of two spaced-apart n1o tors one on one side of said frame and the other on the other side of said frame, an

undercutting kerf-cutter on the forward portion of said frame, spaced-apart upright kerf cutters on the forward portion of said frame, and means for driving all of said kerf cutters from both of said motors.

59. In a mining machine, the combination with a base frame, of a main frame carried by and movable along said base frame, a horizontally arranged kerf cutter mounted on. the forward end of said main frame, upright kerf cutters mounted on opposite sides of the forward end of said main frame, said cutters being adapted to operate in advance of said'main frame, means on .said main frame in position to receive material when dislodged from the space between said upright cutters above said horizontally arranged cutter, means for driving said cutters, a pair of rope drums mount-ed on opposite sides of said receiving means to rotate on upright axes in position to pay out ropes to extend along the bottom and outer edges of said base frame, and a pair of ropes wound respectively on said rope drums and adapted to have their free ends anchored in the {111116;

60. Ina mining machine, the combination witha frame, of spaced-apart motors on opposite sides of said frame at the bottom thereof, kerf-cutting mechanism on the forward end of said frame and' comprising spaeec-apartupright side l:erfcutters, and an undercutting lrer-f-cutter between theside kerf-cutters in position to cut a U-shaped lterf in. a mine wall, and interconnected means connected between said motors and said kerf-cutters for operating all of the latter. a

62. In a mining and loading machine, the combination with a frame, of kerf-cutting mechanism on the forward end thereof, a pair of motors one on one side of said frame and the other on the other side thereof to leave a wide space between them, a conveyor extending from said kerf-cutting mechanism along said wide space between said motors with the space above the conveyor free and unobstructed, and means forv driving said kerf cutting mechanism from both of said motors. a 63.111 a mining machine, the combination with a frame, of a pair of motors on opposite Sides of said frame at the bottom thereof, a horizontally arranged kerf cutter on the forward portion of said frame, spaced-apart upright kerf cutters on the forward portion of saidframe, and means for driving said cutters from said low positio'ned motors.

64. In mining apparatus, the combination with an elongated supporting frame, of mid ing mechanism mounted on said supporting frame to slide longitudinally thereof,'means T01 driving said mining mechanism, and two rope;w1nding devices each plvotally con- .nected to the mining mechanism in positions to have their outer sides adjacent the iongitudinal sides of said frame to effect sliding of the mining mechanism longitudinally along said supporting frame during feed ing movement of the mining mechanism forward and retraction thereof rearward.

65. The combination with a mining ma chine comprising a main frame, of a; rope directing device occupying a middle position and comprising a rope adapted to be eXtended around said rope directing devices and anchored to the remote end of a mine car, and means for operating said rope winding mechanism to secure longitudinal movement of said base frame together with the min-- ing machine thereon along such mine car into position for transportation.

66. in a mining and loading machine, the

combination with a supporting frame, of an undercutting kerf-cutter, spaced-apart upright kerf-cutters, loading apparatus extending longitudinally and centrally of said supporting frame, and a balanced system of power transmission 1 echanism comprising motors on opposite sides of the machine for operating said kerf-cutters.

67. In a mining machine, the combination with a supporting frame, of mining mechanism mounted on the forward portion thereof, a pair of motors on said supporting frame on opposite sides thereof, power trans mission mechanism between said motors and said mining mechanism, a pair of rope wind ing devices on opposite sides of said supporting frame, and power transmission mechanism for said rope winding devices.

68. In a mining and loading machine for low roof mine chambers, the combination with a supporting frame, on an undercutting kerf cutter, spaced-apart upright side kerf cutters, means for connecting said upright side kerf cutters to said supporting frame to permit movement of said cutters to approximately horizontal or folded positions, power transmission mechanism comprising spaced-apart motors at the sides of '-0 er a wide area.

said supporting fram'efor driving said kerf cutters, a pick machine, means for supportingsaid pick machine in elevated position for operation on the material between said side cutters and above said undercutters, means for supporting said pick machine in a relatively low position or folded position, and loading apparatus comprising a conveyor extending from said kerf cuttings mechanism rearwardly between said motors and toward loading position. v

69. In a mining and loading machine, the combination with a supporting frame, of 1 conveyor extending longitudinally thereof 'along its central portion, mining mechanism on the forward end of said frame at the sides of the forward end of said conveyor leaving the space above the forward end'of said conveyor free and unobstructed, and means comprising a motor extendinglongitudinal- 1y, of said conveyor at one side thereof to operate said mining mechanism. while the space above said conveyor along the longitudinal centralportion of the machine 'remains free and unobstructed.

70'. In a mining and lo'adingmachine, the combination with a supporting frame, of a conveyor extending longitudinally thereof, mining mechanism on the forward portion of said frame, and means comprising motors on opposite sides of said conveyor for driving said mining mechanism, the load on the motors being divided and the motors being adjacent the lower sides of the conveyor to adapt the machine for operation in low roof mine chambers while the space between the motors remains free and unobstructed In testimony whereof I have signed my name to this specification on this 5th day of June, A. D. 1920. v

v EDMUND C. MORGAN.