US1544071A - Mining machine - Google Patents

Description

M. P. HOLMES June 30, 1925.

MINING MACHINE Original Filed July 21, 1919' 51Sheeps-Sheet 1 June 30, 1925.

M. P. HOLMES MINING MACHINE Original Filed July 21, 1919 5 Sheets-Sheet l l I 2:: 1'"

June 30, 1925. 1,544,071

M. P. HOLMES MINING MACHINE r Original Filed July 1919 5 Sheets-Sheet 5 June 30, 19525..

' M. P. HOLMES MINING MACHINE 5 Sheets-Sheet 4 Original Filed July 2 1919 June 30, 1925.

. 1,544fi71 M. P. HOLMES MINING MACHINE 5 Sheets-Sheet 5 Original Filed July 21 Patented June 30, 192 5.

i N l T ED S T T l MORRIS P.. HOLMES, 0F CLAREMONT, NEW HAMPSHIRE, ASSIGNORi T0 SULLIVAN MACHINERY COMPANY, A CQRPDRATION OF MASSACHUSETTS.

- mmne maonmn Application filed July 21, 1919, Serial No. 312,346. Renewed November 20, 1924.

proved mining machine of improved construction, and one which is at the same time more flexible in its operation and more conveniently controlled. A further object of my invention is to provide improved and simplified cutting mechanism and improved and simplified cooperating feeding mechanism for such a machine, the two mechanisms being operatively connectedin an improved manner adapted to improve both the feeding and cutting operations. Another object of my invention is to provide improved truck driving mechanism for such a machine and improved controlling mechanism for the cutting, feeding, and truck driving mechanisms thereof whereby the machine is rendered exceedingly flexible and is adapted to be conveniently controlled by an operator withoutdanger to the machine during either the cutting, feeding, or transport operations of the latter. A still further object of my invention is to provide an improved mining machine adapted to hemanufactured at materially decreased cost and equipped with improved cooperating cutter driving, feeding, and truck driving mechanism cooperating in an improved manner during cutting, feeding, or transport and controlled by improved controlling mechanism. These and other objects of my invention will, however, hereinafter more fully appear.

For purposes of illustration, and as an aid in disclosing the principle of my inveni tion, l have shown in the accompanying drawings several embodiments which the same may assume in practice, therein illustrating it as applied to a continuous cutting mining machine of the so-called room and pillar type, although it will here be understood that my invention is not limitedto embodimentin a machine of that type, the

same instead being equally adapted to use in connection with types other than that chosen for purposes of illustration.

shown in section.

Fig. 4 is a detail sectional view on line 4-4 of Fig. 3, showing a part of the controlling mechanism.

-Fig. 5 is a detail sectional view on line 55 of Fig. 4. 4 I

ig. 6 is a detail sectional view on line 66 of Fig. 2.

Fig. 7 is a vertical sectional view on line 7 7 of Fig. 3, showing theoperativeconnections between the feeding and cutter driving mechanism, a part of the controlling mechanism being shown in elevation. F 8 is a sectional view on line 8-8 of 1 1 Big. 9 is a diagrammatic-view showing the different positions of the machine. during the cutting operatlon in a roomnr. the like.

Fig-.10 illustrates a modified construction of the feeding and controlling mechanism, the same being shown in section as in Fig. 3.

Fig. 11 is a plan view, partially in section, of a further modified form of feeding and controlling mechanism.

Fig. 12 is a similar view, partially in section, of a still further modified form of the same.

Fig. 13 is a similar viev, partially in section, of yet another modified form of the same.

In this illustrative disclosure, I will first consider the construction shown in Figs. 1 to 9. In these figures it will be observed that it have shown a mining machine of the room and pillar type including a frame or casing 1 provided with a bottom plate or shoe 2 adapted to support the machine and slidable upon themine bottom or a truck 3. As shown, this frame is provided with a rigid cutter bar 4, as is usual with machines of the type mentioned, and this bar carriesa cutter chain 5 equipped with cutter bits 6 and rotatable'around the bar by means'of a cutter chain driving vsprocket 7, located within the frame, and herein preferably" the form of a feed chain sprocket, and to a.

truck driving member 11, herein also in the form of a sprocket, the construction being such that through flexible feeding means,-

herein for illustrative purposes shown in the form of a feed chain 12 and operatively connected to the feed operating member 11 and uided by cooperating guiding members, herein in the form of idlers 13, 14, 15, and 16, the machine is adapted to be propelled by its own power relative to the mine bottom or the truck in a well known manner, while through a chain connection 17 operatively connectable between the member 11 and the truck wheels 18, the machine is adapted by its own power to propel the truck when mounted in transport position thereon.

In considering my improved construction in detail, I will first describe the cutter driving mechanism adapted to drive the cutter chain sprocket 7. It will be observed in Figure 3 that the motor armature 9 is provided at its rear end with a bevel \pinion 19, herein meshing with a horizontally dis posed lower bevel gear 20, which, as shown in Fi 7, is in turn rotatably mounted in suitab e bearirigs 21, herein of the roller type, at the upper end of a-vertical stud 22 having its lower end threaded and extending through suitable adjustable bearings 23 and supported on the shoe 2 at the rear end of the latter; This bevel gear 20 in turn is fixed, herein by a key 24, to a sleeve 25, likewise external to the bearings 21 and coaxially disposed with and rotatable relative to the stud 22 and having a pinion 26 on a lower reduced portion of the sleeve. This pinion 26 in turn meshes with a plurality of slightly lar er pinions 27, herein three, disposed radia 1y thereabout and rotatably mounted, as on removable bearing members 28 carried on a rotatable spider 29 which in turn has an upstanding rotatable sleeve 30 disposed coaxially with the stud 22 and between the same and the pinion 26 and gear 20. As shown, roller bearings 31 are herein provided between the pinions 27 and the members 28 and both the bearings 31 and the members 28 are removably attached to the rotatable spider 29 by screws 32. Herein, it will also be observed that the pinions 21' mesh with an internal gear 33, which is journaled on the lower end of the stud and preferably integrally united, as by screws 34, with the cutter chain driving sprocket 7, likewise journaled on said stud. The gear 33 isherein also provided with a depending portion 35 having a flange 36 at its periphery running close to the inner edge of a flange 37 formed on the frame 1, the construction being such that thereby the entry of cuttings or the like into the gearing is effectually. prevented at the same time that the gear and sprocket are ,made' removable as a unit from the top of the frame. Here, attention is also directed to the fact that the outer periphery 38 of the gear 33 is adapted to be engaged by controlling means, herein in the form of a hand brake 39, having one end operatively connected to the frame, as at 40, and its other end connected to a threaded controlling member 41 threaded (see Figure 6) in a bushing 42 extending through .a suitable aperture in the side of the frame and controlled by a nut 43 rotatable by a hand wheel 44 on the outside of the frame. As a result of this construction, it will be observed that the cutter chain driving sprocket 7 may be rotated or idle while the motor is running, the cutter chain driving sprocket being adapted to be driven at full speed when the member 29 is stationary, and to. rotate at a speed inversely proportional to the speed of rotation of the member 29 and even to be completely stopped when the brake band 39 is applied.

Operativel connected to my improved cutter chain riving mechanism, is improved cooperating feeding means adapted to drive the feed operating member 10. As shown, the sleeve 30'on the spider 29 carries on its upper ends. small bevel pinion 45, which in turn constantlymeshes with corresponding bevel gears 46 and 47, the proper mesh being obtainable through adjustment of the adjustable bearings 23. These gears 46, 47 are herein spaced apart by a spacing member 48 formed on the upper end of the stud 22 and are provided with ball bearings 49 at their adjacent ends and freely rotatable on a feed driving shaft 50 disposed transversely of the frame, as shown in Fi 3, and removable laterally through the side thereof, one end of the same preferably normally extending therethrough, as illustrated. Herein, the gear 47 is also, rigidly connected, as by ion screws 51 to a rotatable friction clutch cas ing 52, herein carrying therein one of the elements of a friction clutch 53 and cooperating with an inner member 54 carrying the other element thereof. This member 54 is in turn suitably fixed to the shaft 50, as by a key 55, and is also fixed, as by a key 56, to a sleeve 57 on the feed operating member 10,

which, asherein shown, is preferably removably carried on the protruding end of the shaft and rotatably mounted, as in roller bearings 58, in a fixed stepped member 59 closing an aperture 60 in the side of-the frame. Herein, this member 59 has an annular chamber 61 therein receiving an adjustable friction controlling member 62 adapted to compress or release the elements of the friction clutch at will and thereby cause the feed operating member 10 to be rotated with the shaft when the friction is loaded or to enable the shaft to rotate independently of the member 10 when the friction is released. Referring back to the gear 46, it will be noted that this gear is similarly connected with the shaft, the same being attached by screws 63 to a rotatable friction clutch'casing64 carrying one of the ele ments of a friction clutch 65, the other element of the latter being, as heretofore, carried by a member 66 keyed at 6,7 to the shaft 50, and the clutch, as heretofore, also being controlled by an adjustable friction controlling member 68 movable in an annular chamber 69 in a fixed stepped sleeved member 70 closing an aperture 71 in the opposite side of the frame. As a result of this construction, it will be observed that it is possible for the operator to drive the feed operating member in either direction at will and to balance the action of the frictions 53, as desired, either the so-called forward friction mechanism 53 or the so-called reverse or dragging friction mechanism 65 acting as a dragging friction when the other is used as the driving friction. Here it will also be observed that through my improved gearing acting between the feeding mechanism and the cutter chain, when the reverse friction 65 is used and the brake band 39 is set. the

speed of the reverse feed then obtained, i. e.

when the cutter chain is not in operation, is materially greater than the forward or cut ting speed obtainable when the brake band is released and the forward friction 53 is used, i. e. when the cutter chain is in operation.

the stepped sleeved member suitable.

,. hers.

Operatively connected with the feeding mechanism, herein through the friction mechanism 65, is improved truck driving mechanism adapted operatively to connect or disconnect the truck driving member 11. As shown, this member is-provided with a sleeve 72 receivable on a corresponding sleeve 73 on a sleeved member 74 which is fixed. as by a key 75, to the hub of the member 66 and rotatable with the same inside bearings, herein in the form of roller bearings 76, being provided between said mem- He're it will also be observed that clutch-teeth 7 7 are provided on adjacent surfaces of the members '11 and .74, and that, as shown in Fig. 1, the member 11 is pro- 'vided with a plurality of communicating the member-'11 and moved over with its axial aperture in registry with a suitable axial opening in a removable plug 81 threaded into the end of the shaft and overlying a flange 82 on the member 74 in such a manner as to hold that member in position upon the shaft, a screw 83 being insertabie through the sleeve and threaded into the member 81 when the sleeve is in its registering position. By such a construction it will be observed that the truck driving member. 11 may be connected or disconnected from the member T l, which is rotatable with the member 66, whenever desired, by simply screwing in or screwing out the screw 83, in such a manner as to cause the clutch teeth 77 to engage or to be disengaged. In other words, it will be ob served that it is thus possible when the machine is on the truck, to connect the member 11 to the member 74 in such a manner as to drive the member 11 through the friction mechanism 65 or to drive the clutch driving member 11 in either direction under the control of one or the other of the friction mechanisms without reversing the motor. it of course being understood that dur ing this truck driving operation the brake band 39 is set tight in such a manner as to revent movement of the cutter chain drivmg sprocket 7. At the same time it will be observed that through the supplemental clutch connection between the truck driving member 11 and its driving mechanism it is possible for this member to be readily disconnected from its driving mechanism and thereby enable the latter to be utilized independently, as during the unloading, cutting, and loading operations.

Cooperating with the frictional mechanism hereinabove described, is improved means for controlling the same whereby the facility of control is enhanced and the effort required by the operator is materiallyreduced. These means, as shown herein, are of the fluid pressure type, the annular chambers 61 and 69 in the members 59 and 70 being in the form of cylinders, and the movable friction controlling members 62 and 68 bein in the form of pistons movable in said cyli ders under the influence of fluid pressure, herein the pressure of a liquid, such as oil, admitted thereto through passa cs 84, '85 formed in the members 59 and 0, respectively, and supplied, respectively, through pipes 86 and 87 receiving their supply from an oil supply means 88. As shown,

the same out through the pipes 86, 87 to actuate the-friction mechanism. Also, it will be observed that these pistons are each provided with oil reservoirs 91 at their upper ends, and that these reservoirs communicate, through passages 92, with ports 93- each controlled by a spring pressed valve 94 seated in the lower end of the piston and normally held in' a position'to close said port 93 and open a cooperating, slightly larger port 95, by means of a coiled spring 96. It will also be observed that these pistons are provided with rods 97 adapted to be operated by arms 98 on coaxially disposed controlling members 99 and 100 suitably journaled in the frame and having handles 101 and 102 connected to the outer ends thereof. Herein it will also be,observed that a safety device is interposed between the rods 97 and the arms 98, the same herein having a bowed spring 103 normally engag ing a stop 104 (likewise carried by the'rod 97 and having a fiat portion 105 depressible by a lug 106 on the arm 98 when the latter is depressed against the action of the spring and within the limit established by lugs 107 formed on the side of the frame and engageable by the operating handle. As a result of this construction, it will be observed that in order for the operator to ap ply a friction it is only necessary for him to move one of the conveniently and readily adjustable controlling handles 1 01, 102 as far as desired, in orderto subject the ringlike operating piston of the particular friction mechanism to the desired pressure. Here it will also be observed that through the rovision. of the valves 94each of these mec anisms is automatically adapted to make good any loss of oil due to leakage, wear or the like, as a vacuum in the cylinders89 will cause the valve to be operated automatically to permit additional oil to flow into the system from the reservoir 91. It will also be observed that through the safety device including the s'pring'103 it is made impossible for the operator to apply more than a desired maximum pressure to the friction mechanism, and that by providing a lug 108 above the stop 104,-the elevation of the arms 98 is caused automatically to lift the pistons.

In considering the operationvof my improved construction I will describe the same during the complete cycle involved in entering, cutting, and leaving a place, as for instance a room. During transport, the machine frame 1 is carried upon the truck 3, and the truck driving sprocket 11 is connected through the chain and sprocket connection 17 with the truck wheels. When the motor is running and the brake band 39 is set tight, the internal gear 33 is held against rotation, and as a result the cutter chain driving sprocket 7 is held stationary.

7 in either direction under the control of the frictional mechanism, and without, stopping the motor. When the desired place is reached, as for instance a room, it is only necessary in unloading the machine, to throw the friction then used in driving the truck into neutral position and unclutch the truck driving member 11 from the member 74, arrange the feed chain in the usual manner to feed the machine oil' of the truck, and through the movement of the controlling member 101 connect the forward feed friction 54, which will then rotate the feed operating member 10 and thereby cause the machine to befed along the feed chain 12 and relative to the truck to unloaded position, the chain 17 being removed as the-machine moves forward on the truck. With the machine thus un loaded from the truck, it is then only neces sary to rearrange the feed chain and, through operation of the same controlling member 101, cause the machine to be fed along the chain into sumping position. When this position is reached, it is only necessary partially to release thebrake band 39 to allow the cutter chain driving sprocket 7 to rotate and, through operation of the same friction controlling member 101, cause the machine to be sumped under the coal. When the machine has thus been sumped,

-it is next possible, after rearranging the feed chain in a well known manner for the transverse cut, through the same controlling member 101 to start the transverse movement of the machine along the face. Then,as the cutter chain begins to take its full load, the band brake 39 is correspondingly released until the cutter chain assumes its full load, when this band is entirely released, its effect then being replaced by the load on the chain. Then the machine is moved along transversely to the face at any desired speed :driven through the connection of the friction 53 and under the control of the drag friction 65, by simply operating the controlling member 102 of the latter to vary the effect of the friction 53 as desired. Dur-, ing this transverse movement, when soft cutting is encountered it is also possible further to increase the speed of feed above the amount which is obtainable by the reaction of the cutter chain in such cutting, throu h application of the band brake 39. On t :e contrary, when hard cutting is encountered, it will be observed that-it is possible to load the friction up to the limit established by the safety device including the spring 103 and stop 107 'by pressure upon-the handle 101 controlling the forward feeding friction.

capacity by this means, as a'spring 103 is provided of a predetermined strength adapted to limit the pull to a desired limit, as for instance six thousand pounds. Accordingly, the only way that an operator may further increase the load on the cutter chain is to load the reverse friction. 65 through operation of its controlling handle 102, but even here it will be observed that he will as a result be able to do no damage, as such an action reduces the speed of the machine, and if he loads this friction sufficiently hard to load the same to the same amount as the forward feeding friction, he will, since the springs 103 are of the same strength, cut-out the feed and thereby stop the feeding movement of the machine. In other words, even if this method of abuse of the machine is attempted, themachine is protected against any damage, the effect of the same only being to shut down the feeding movement and'enable the cutter chain to rotate around the then stationary bar and cut itself free, in which condition the mechanism Will remain until the operator corrects the adjustment of the friction mechanism. If in the course of cutting, a place it is necessary to cut around an obstruction, it will be evident that through operating the controlling member 102 the operator is enabled to back the machine out from the cut whenever desired, and that through the operation of the forward and reverse frictions, through their controlling members 101 and 102, respectively, and the usual take-up, he is enabled to angle the machine as may be necessary in cutting in back of an obstruction in a well known manner. Here, attention is also directed to the fact that with my improved construction the operation of setting the bits on the cutter chain at any time, as during a transverse cut, is greatly facilitated, it being only neces sary to tighten both feed frictions 53 and simultaneously and release the brake band to enable a slow movement of the cutter chain to be obtained, which is well adapted to bringing the bits successively out of the kerf and opposite the operaton'and which is also capable of being quickly stopped whenever desired by simply releasing the frictions or applying the brake bands. As the machine approaches the opposite rib, i. e. as it nears the end of its transverse cut, the operator will only be required to, rearrange the feed chain in a well known manner and while still using the same forward friction, causethe machine to clean up the rib and back out of the cut. After the out has thus been 'completed and the feed chain rearranged as usual, it will also be observed that as soon as the bar clears the kerf it is only necessary to set the brake band tight and, through operation otthe controlling members 101 and 10? release the forward friction 54 and load the reverse friction 65, thereby to cause the machine to be fed back toward the truck on its fast reverse feed. It will thus be observed that through the entire operation of transport, unloading, sumping, cutting the place, backing out of the cut, and re loading the machine, it is unnecessary for the motor to be stopped, and that through my improved and simplified controlling mechanism the operator is enabled to control the machine in such a manner as to meet any exigencies arising, by the movement of the convenient controlling means readily adjust-able without material effort on his part.

It will also be observed that through my improved operative connections between the feeding mechanism and the cutting mecha nism, these mechanisms are always balanced, the construction being such that when the speed of one goes up the speed of the other decreases, and vice versa, the reaction of the cutter chain always being equal to the pull of the feed chain under the control of one friction plus the dragging effect of the other friction. Here, attention is also directed to the fact that when it is desired to operate the machine as a right hand machine, the same may be readily adapted to cut in the desired direction by transposition of the feed operating member 10 and truck driving member 11, the same being readily. transposable with their respective sleeve members, It will also be observed that through the provision of the idler 16 located in the center and at the rear of the machine, it is possible for the feed member-12 to be connected for a direct pull on the machine when the free end of the member 12 is connected to a usual chain fork on the truck, herein shown at 16', i. e. when the machine is being loaded on the truck into the loaded posi tion shown in Fig. 1, wherein its movement is arrested by the usual stops 16", and that through the provision of the inclined idlers 15 at the rear corners of the frame, it is possible to pass the feed chain from the feed operating member 10 directly to the adjacent idler,thereby reducing the number of bends in the chain.

In Fig. 10 I have illustrated a modified form of controlling mechanism for the frictions which, while the form heretofore described is preferred, possesses certain advantages when operated by an intelligent o erator. In this construction it will be observed that the bevel gears, friction mechanism, and feed operating and truck driving members are constructed and arranged substantially as hereinabove set forth, the

same, however, being controlled by coaxially disposed controlling mechanism herein extending through a shaft 50. hlorc particularly, it will be noted that the pistons on the controlling members for the friction an axially disposed rod 114, and movable relative to abutments located between the same and comprising packed piston-like abutments 115, 116 normally held in central position by oppositely acting springs 117 and 118 of equal strength, surrounding a sleeve 119 threaded to the members 115 and 116 and acting through washers 120, 121,

between the pistons and central abutments in the formof flanges 122 and 123 on the sleeve 119 and the shaft 50, respectively, to maintain the member 115, 116 in a central position. that one end of the rod 114 is extended through the feed operating member 10 and is threaded, as at 124, in a nut 125, and that the rod is provided with an operating hand wheel 126 and the nut provided with an operating hand wheel 127. Here, attention is also directed to the fact that the shaft 50 is closed at its ends by hollow plug members 128 and 129, of which the member 128 is clamped between the nut 125 and the feed operatlng member 10 and extended inside the shaft 50 alongside the piston rod of the piston 111,'the samebeing provided with teeth 130 engaging with longer teeth 131 formed on the piston rod to lock the parts against relative rotation, while the member 129 serves to clamp the anember 74 1nto position and is provided with corresponding teeth 132 cooperating with similar longer teeth 133 formed on the piston rod and performing a similar function. "In

this instance, attention is also called to the fact that the piston rod is proiided with an axial opening 134 in its inner end adapted to relieve any pressure generated by the movement of the rod 114 in a chamber 135 formed in the piston rod.

By the provision of such a mechanism, it will be observed that it is possible to control the frictions substantially as above set forth by adjustment of the hand wheels 126 and 127, and that while an ignorant operator is unable to abuse this mechanism more than that heretofore described, an intelllgent operator is enabled to use the same to advantage. More particularly, it will be noted that the two pistons 111 and 112 will be simultaneously moved toward one another or away therefrom by adjustment of the hand wheel 126 when the hand wheel 127 is held stationary, and that the rod 114 will beadjusted bodily with the pistons in Here it will also be observed "either direction when the hand wheel 126 is held stationary and the hand wheel 127 is rotated. Thus, it will be observed that through movement of the hand wheel 12? the rod 114 may be adjusted bodily to bring the desired piston 111, 112 into contact with the oil, and thereafter, through operation of the hand wheel 126, the desired piston may be adjusted relative to the rod in such a manner as to subject the oil to the desired pressure necessary to cause loading. of the friction within. the limit of the springs 117, 118. During this operation, itwill also be observed that the pressure of one piston causes one spring, as for instance the spring 117, to be compressed and the other spring. as the spring 118,'to bereleased so that when the drag friction is operated, by movement of the other piston, the effect of the movement of the operating piston thereof is to force back the member 115 to build up additional pressure acting on the forward friction. In other words, it will be observed that with this mechanism an operator is enabled through the operation of the controlling mechanism for the drag friction, to maintain a constant rate of feed by maintaining a constant pull or torque on the feed operating member. a

In Fig. 11 I have illustrated a modified form of my invention, whereby the same may be adapted to use in connection witha flexible feed mechanism utilizing two cables as distinct from a chain. As shown in this figure, it will be observed that the friction mechanism and the controllingmechanism therefor are substantially the same as those described above with the, exception that the outer casing member 64 of the clutch is the driven member instead of the driving member, the controlling mechansm being particularly described in connection with Fig. 10, so that a further description of the same isdeemed unnecessary. It will, however, be observed that in this construction upon the frictioncasing members 64, drums 136 and "137 are formed adapted to wind and unwind cables 138 and 139 disposed around the rear idlers on the frame and extended to the drums through suitable apertures 140 and 141 in the rear of the frame. Thus it. will be observed that instead of utilizing :1 continuous feed chain, my invention may be adapted to use in connection with a plurality of cables, if desired, and that in the adaptation of the same to this use shown herein,the cable winding members may be located compactly within the frame in such a manner as to reduce the width of the latter.

In Fig. 12 I have shown a further modi fied form of my invention. wherein instead ofutilizing two frictions I have provided four frictions, and wherein through this construction I have been able to reduce by one-half the velocity of the draggii iig friction and thereby cut down by onealf the waste o power. While the controlling mechanism and friction mechanism are substantially the same as those hereinabove described, and therefore repetition of the detail description thereof is not necessary, it will be noted that in this construction a plurality of ports 142 and 143 communicating with the interior of the shaft are provided between the latter and a plurality of cylinders 144 and 145, in each of which a double ended piston 146 is movable to actuate a friction controlling member 147 adapted to compress either of two frictions 148 and 149, alike construction being provided in each friction. Attention is here also directed to the fact that a pressure retaining sleeve, herein formed in four parts, 150, 150', 151, and 152, to facilitate assembly, is herein disposed around the shaft 50, the ends of the elements 151 and 152 thereof being connected to the outer frictions 148 of different sets, while the middle elements 150, 150', thereof is connected to the adjacent frictions 149. In this construction it will be observed that the inner frictions 149 act as the driving frictions, while the outer frictions 148 act as the drag frictions.

In Fig. 13 I have illustrated a further modified construction of the general type of that shown in Fig. 12, but wherein instead of providing two double sets of frictions I have provided mechanism including two frictions and two toothed clutches. In this construction, as in that heretofore described, the construction of the friction mechanism and the controlling mechanism therefor is substantially the same as that described in connection with Fig. 10, so that a repetition of this description seems unnecessary. It will here, however, be observed that the pistons are provided with chambers 153 and 154, housing springs 155 and 156, which normally act to load the friction, the hydraulic means herein being utilized to release the friction. Attention is also directed to the fact that I have provided the sleeve 157 used herein. corresponding to the sleeve 150, 150', 151., 152, at pomts on opposite sides of the bevel gears, with teeth 158 dis posed opposite corresponding teeth 159 on the hubs of the bevel gears, the two sets of teeth each being adapted to be clutched together by a longitudinally movable toothed clutch member 160 formed on a ring 161 and adjustable from the side of the frame through suitable controlling mechanism herein indicated at 162. In this construction it will be observed that the lower friction will act as the driving friction and that the upper friction will act as the drag friction, and that when either friction is operated its cooperating toothed clutch mechanism will be operated to produce substantially the same effect produced in the construction described in Fig. 12, wherein a plurality of frictions is used, a friction and its corresponding toothed clutch being operated instead of two frictionsbeing operated, as in that form.

As a result of my improved construction it will be observed that at the same time that I am enabled, through so-called reaction mechanism or reaction gearing, to utilize the reaction of thecutter chain in the feeding mechanism and through improved controlling, feeding, and truck drivingmechanism obtain the improved results above set forth, it has also been possible to make the mechanism readily accessible, the friction mechanism being readily removable through the side of the frame or from the top thereof when the drive shaft is removed through the side of the frame, and the cutter chain driving mechanism being removable through the top of the frame. Attention is also directed to the compact character of the construction whereby it is made possible to provide ample space on the machine and within the frame thereof for the electric controlling mechanism, my improved construction providing ample space forthe resistance and the use of even a drum controller such as that indicated at 9 herein and controlled by the controller handle 9".

lVhile I have in this application specifically described several forms which my invention may assume in practice, it will be understood that these forms are illustrated herein in order that the invention may be understood, and that the invention itself may be modified and embodied in various other forms without departing from its spirit.

\Vhat I claim as new and desire to secure by Letters Patent is:

1. The combination with a mining machine, of a feed operating member, cutting mechanism, and variable speed mechanism therebetween operative to cause the speeds of said feed operating member and said cuttingmechanism to vary inversely.

2. In a mining machine, the combination including a motor, a feed operating member, cutting mechanism, and variable speed mechanism between the cutting mechanism and the feed operating member driven by the motor and operative to cause the speeds of the feed operating member and cutting mechanism to vary with each other according to a definite relation while the motor speed remains substantially constant.

3. The combination with-a mining ma- I resistance to rotation of said feeding mechanism may provide the reaction necessary for the driving of said cutting mechanism and vice versa.

4. The combination with a mining machine, of cutting mechanism movable bodily therewith, during cutting and lateral feeding mechanism operable by the reaction of said cutting mechanism.

5. The combination With a flexibly fed laterally cutting mining machine, of cutting mechanism thereon, and a feed operating member driven by the reaction of said cutting mechanism.

6. The combination with a flexibly fed laterally cutting mining machine, of cutting mechanism thereon, feeding mechanism driven by the reaction of said cutting mechanism, and means for varying the effect of said reaction.

7. In a room and pillar mining machine, the combination including a motor, a feed operating member, cutting mechanism, means including a motor driven train for driving said cutting mechanism, and means. driven through said train for driving said member at ,a plurality of speeds dependent upon the speed of said cutting mechanism while said motor speed remains substantially constant.

8. The combination with a mining machine, of lateral feeding mechanism, cutting mechanism, and mechanical means operatively connecting the same for decreasing the speed of one upon an increase in speed of the other.

9. The combination with a room and pillar mining machine, of feeding mechanism, cutting mechanism, and mechanical means operatively connecting the same for decreasing the speed of one upon an increase in speed of the other during cuttin 10. The combination with a, mining ma chine, of,a cutter chain driving member, a motor, and operative connections therebetween for positively varying the speed of the former while maintaining the latter at full speed.

11. The combination with a mining machine, of a cutterchain driving member, a motor, and operative connections therebetween for at will positively arresting the movementof the former while maintaining the latter at full speed.

, 12. The combination with a mining machine, of a motor, cutting mechanisi'n driven thereby, and means for at will connecting said cutting mechanism and said motor while continuing the rotation of the latter and for positively arresting the movement of the cutting mechanism.

13. The con'ibination with a mining machine, of a feeding nn-chanism thereon 'n eluding a plurality oi feeding i'rict ions. an l means for interrupting the feed when said frictions are both loaded and equally so.

14. The combination with a mining machine, of feeding mechanism, cutting mechanism, and constantly meshing reaction driving gearing therebetwecn operable to drive either said feeding mechanism or both of said mechanisms at will, said reaction gearing having elements so related that the resistance to rotation of each of said mechanisms may provide the reaction necessary for the driving of the other.

15. The combination with a room and pillar mining machine, of feeding mechanism for feeding the same laterally during cutting, cutting .mechanism, and driving means therebetween for driving said feeding mechanism and said cutting mechanism at inversely varying speeds.

16. The combination with a mining ma chine, of lateral feeding mechanism, cutting mechanism, driving means for both of the same disposed therebetween including reaction driving gearing, said reaction gearing having elements so related that the resistance to rotation of each of said mechanisms may provide the reaction necessary for the driving of the other, and means for con trolling said gearing.

17. The combination with a mining machine, of feeding mechanism. cutting mcchanism, reaction driving gearing between the same, said reaction gearing having elements so related that the resistance to rotation of each of said mechanisms may provide the reaction necessary for the driving of the other, and means for causing at will said gearing to drive said feeding mechanism only.

18. The combination with a mining machine, of feeding mechanism. cutting mechanism, reaction driving gearing between the same, said reaction gearing having elements so related that the resistanceto rotation of each of said mechanisms may provide the reaction necessary for the driving of the other, and means for causing said reaction driving gearing to drive said feeding mechanism wlth said cutting mechanism or independently thereof in an opposite direction.

19. The combination with a mining ma chine, feeding mechanism, cutting mecha nism, reaction driving gearing between the same, said reaction gearing having elcments so related that the resistance to rotation of each of said mechanisms may provide the reaction necessary for the driving of the other, ar d means for causing said reaction driving gearing to drive said feeding mechanism with said cutting mechanism or independently thereof in an opposite direction and at a higher speed. i

Qfi..The combination with chine, of a feed operating mechanism. a cutter chain driving, member. operative t'm|- nections including reaction driving gearing for both of the same disposed between at.-

a mining umsame, said reaction gearing having elements so related that the resistance to rotation of said feed operating mechanism may provide the reaction necessary for the driving of said cutter chain driving member and vice versa, and controlling means for said reaction driving gearing.

21. The-combination with a mining machine, of a feed operating member, forward and reverse frictional driving mechanism therefor, a cutter chain driving member, and reaction driving gearing between said mechanism and said driving member, said reaction gearing having elements so related that the resistance to rotation of each of said members may provided the reaction necessary for the driving of the other.

22. In a mining machine, the combination including a feed operating.member, forward and reverse frictional driving mechanism therefor, a cutter chain driving member, re-

action driving gearing between the latter and said mechanism, said reaction gearing having elements so related that the resistance to rotation of each of said members may provide the reaction necessary for the driving of the other, and means for controlling said reaction gearing operative to retard the rotation of one element thereof.

. 23. In a mining machine, the combination including a feed operating member, forward and reverse frictional driving mechanism therefor, a cutter chain driving member, reaction driving gearing between the latter and said mechanism, said reaction gearing having elements so related that the resistance to rotation of each of said members may provide the reaction necessary for the driving of the other, and means for controlling said reaction gearing operative to retard the rotation of different elements thereof.

24. In a minin machine having a frame slidable over a mlne'bottom during cutting, the combination including a cutter chain driving member, a driving member therefor, said members bearing fixed'relations to said frame and reaction driving gearing between said driving member and said cutter chain driving member, said reaction gearing including a reaction element held stationary to cause driving of said cutter chain driving I rotation of said gear, and feeding mechjmember. Y

25. The combination with a mining machine, of a cutter chain driving member, a rotatable feed operating member, reaction driving ,gearing for both of the same disposed between said members including a rotary member, said reaction gearing having elements so related that the resistance to rotation of each .of said first two members may provide the reaction necessary for the drivin g of the other, and means for varying the speed ofrotation of said rotary member at will.

feed operating member, reaction driving gearing between said members operative to effect the driving thereof at interdependent rates and including a rotary member, means for varying the speed of rotation of said rotary member at will, and frictional means controlling the rotation of said feed operating member, said reaction gearing havto rotation of each of said first two members may provide the reaction necessary for the driving of the other.

28. The combination with a mining machine', of a cutter chain driving member, a feed operating member, reaction driving gearing between said members operative to effect the driving thereof at interdependent rates and including a rotary member, means including a brake band for varying the mg elements so related that the resistance speed ofrotation of said rotary member at will, and a plurality of cooperating frictions controlling said feed operating member.

29. The combination with a minin machine; of a cutter chain driving mem er, a driving member therefor, and reaction gearing therebotween including an internal gear and driving pinions engageable therewith and driven by said driving member.

30. The combination with a minin chine, of a cutter chain driving memIver, a driving member therefor, reaction gearing therebctween including an internal gear and driving pinions therefor driven by said driving member, and means for controlling the rotation of said gear.

31. The combination with a mining machine, of a cutter chain driving member, a driving member therefor, reaction gearing therebetween including an internal gear and driving pinions therefor driven by said driving member, means for controlling the with said gear, a pinion driving said pinions, driving mechanism connected to said pinion, and feeding'mechanism connected to said rotatable member.

34. The combination with a mining machine, of a cutter chain driving member, an internal gear rotatable therewith, a rotatable member carrying pinions engageable with said gear, a pinion driving said pinions, driving'mechanism connected to said pinion, and frictional feeding mechanism connected to said rotatable member.

35. The combination with a mining machine, of a cutter chain driving member, an internal gear rotatable the ewith, a rotatable member carrying pinions engageable with said gear, a pinion driving said pinions, driving mechanism connected to said pinion, and feeding mechanism including a plurality of independently controlled frictions driven by said rotatable member.

36. The combination with a mining machine, of a motor, reaction gearing driven thereby, including elements each of which may be rotated while the other is stationary or both of which ,may be simultaneously rotated at interdependent different speeds feeding mechanism connected to one of the elements of said gearing, and cutter chain driving mechanism connected to another element of said reaction gearing, the elements of said reaction gearing being so related that the resistance to rotation of each of said mechanisms may provide the reaction necessary for the driving of the oth er.

37. The combination with a mining machine, of a motor, reaction gearing driven thereby, including elements each of which may be rotated while the other is stationary or both of which may be sinmltaneously ro-' tated at interdependent different speeds feeding mechanism connected to one of the elements of said gearing, cutter chain driving mechanism connected to another element of said reaction gearing, and means for controlling therotation of one of said elements, the elements of said reaction gearing being so related that the resistance to rotation of each of said mechanisms may provide the reaction necessary for the driving of the other.

38. The combination with a mining machine, of a motor, reaction gearing driven thereby, including elements each of which may be rotated while the other is stationary or both of which may be simultaneously rotated at interdependent different speeds feeding mechanism connected to one of the elements of said gearing, cutter chain driw ing mechanism connected to another ele-. ment of said reaction gearing, and means for controlling the rotation of said last mentioned element, the elements of said reaction gearing being so related that the resistance to rotation of each of said mechanisms may provide the reaction necessary for the driving of the other.

39. T he'combination with. a mining machine, of a cutter chain driving member, feeding mechanism driven by the reaction of said member, and means for rendering said member inoperative while continuing the operation of said feeding mechanism.

40. The combination with a mining machine, of a cutter chain driving sprocket, feeding mechanism including a plurality of frictions, and reaction gearing disposed between said frictions and said sprocket and normally driving elements of said frictions in opposite directions.

41. The combination wi n a mining. ma-- chine, of a cutter chain driving sprocket, feeding mechanismincluding a plurality of frictions, reaction gearing dispos d between said frictions and said sprocket and normally driving elements of said frictions in opposite directions, and means for controlling said reaction gearing.

42. The combination with a mining machine, of a feed operating member, a plurality of frictions .operatively connected thereto, a (hitter chain driving sprocket member, and variable reaction mechanism o' 'ieratively connected between the latter and one element of each of said frictions, said reaction mechanism having elements so related that the resistance to rotation of said feed operating and sprocket members may provide the reaction necessary for the driving of each other.

43. The combination with a mining machine, of a feed operating member, a plurality of coaxially disposed frictions operatively connected thereto, a cutter chain driving sprocket member, and variable reaction gearing operatively connected between the latter and one element of each of said frictions. said reaction gearing having elements so related that the resistance to rotation of said feed operating and sprocket members ma provide the reaction necessary for the driving of each other.

44. The combination with a mining machine of a motor thereon, a truck driving member thereon, and multi-planet planetary gearing between said last mentioned elements v 45. The combination with a mining machine, ot' a motor thereon, a truck driving member thereon, planetary gearing between said last mentioned elements, and frictional controlling means for said member for controlling the speed of rotation thcreofand controlling the orbital rate of the planet of said planetary gearing.

-l-(i. The con'ibination.with a mining niacbinc,ot' a motor thereon, a truck driving member thereon, planetary gearing between the driving of the other, a truck driving member on said machine, and means for driving the same from said mechanism.

1 48. The combination witha mining machine, cutter chain driving and feed operating members thereon, variable reaction mechanism between the same, said reaction mechanism having elements so related that the resistance to rotation of each of said members'may provide the reaction neces-.

sary for the driving of the other, frictional controlling means for said feed operating member, and a truck driving member driven by said mechanism and controlled by said controlling means.

49. Thecombination with a mining machine, cutter chain driving and feed operating members thereon, variable reaction mechanism between the same, frictional controlling means for said feed operat ng mom ber including forward and reverse frictions, and a truck driving member driven by said mechanism and controlled by said controlling means.

50. The combination'with a-mining machine, of a transversely disposedfeed operating member, controlling means therefor including forward and reverse driving frictions, and means for permitting driving said feed operating member from one friction and controlling the same by the other.

' 51. The combination with a mining machine, of transversely disposed feed operating and truck driving members, controlling means therefor including forward and reverse driving frictions, and means for driving said truck driving member fromeithcr of said frictions.

52. The combination with a mining machine, of a feed operating member, driving means therefor including a pair of frictions disposed coaxially with said'member, and means for driving said feed operating member at equal predetermined speeds in opposite directions through different frictions.

The combination .with -a mining machine slidable on a mine bottom, of flexible feedirig means for feeding the same laterally relative to a mine 'face, cutting mechanism on-said machine, and feed operating mechanismfidriven by the reaction" of said cutting mechanism.

54. The combination with a mining machine sl-idable on a mine bottom, of, flexible feeding means for feeding the same laterally relative to a mine face, cutting mechanism on said machine, and means rotatable by the reaction of said cutting mechanism having provision for feeding said machine in opposite directions at different speeds.

The combination with a mining machine frame, of cutting mechanism movable bodily therewith during cutting, and flexible feeding means for feeding said mechanism laterally relative to a face including a feed operating member driven by the reaction of said cutter mechanism.

56. The combination with a mining ma chine frame, of cutting mechanism movable bodily therewith during cutting, and flexible feeding means for feeding said mechanism laterally relative to a face including a feed operating member driven by the reaction of said cutter mechanism and a feedcontrolling friction. I

57. The combination with a mining ma-' chine frame, of cutting mechanism movable bodily therewith during cutting, and flexible' feeding means for feeding said mechanism'laterally relative to a face including a feed operating member driven by the reaction of said cutter mechanism and a cooperatingretarding friction.

58. The combination with 'a mining machine frame, of cutting mechanism movable bodily therewith during cutting, andflexible feeding means for feeding said mechanism laterally relative to a faceincluding a feed operating member driven by the reaction ofsaid cutter mechanism and a plurality of cooperating feed controlling frictions.

59. The combination with a kerf cutting i mining machine, of a feed operating member, frictionally controlled reversible feeding mechanism therefor including a plurality of frictions, and fluid pressure actuated controllingmeans for each of said frictions.

60. The combination with a kerf cutting mining machine, of frictionally controlled feeding mechanism including a plurality of frictions. and hydraulic controlling means adjustable to control either or both of said frictions.

61. 'The combination with a kerf cuttin mining machine, of frictionally' controlledfeeding mechanism including a plurality of frictions, and fluid pressure actuated controlling means operative to apply to either of said frictions separately or both simultaneoilsly including a plurality of independ-' ently operable controlling members.

62. The combination with a mining machine, of frictionally controlled feeding mechanism including a plurality of frictions, and fluid pressure operated controls. ling meansfor loading one friction and con trolling the effect thereof through partially loading the other.

63. The combination with a mining machine, offrictionally controlled feeding mechanism including a plurality of frictions, andfluid pressure operated controlling means for loading either friction and controlling the effect thereof through partially loading the other.

64. The combination with a kerf cutting mining machine, of frictionally controlled feeding mechanism including a plurality of frictions, a piston movable to load each friction, and a manually operated pump for operating each piston said pumps being operable simultaneously or separately.

65. The combination with a kerf cutting mining machine, of frictionally controlled feeding mechanism including a plurality of frictions, fluid pressure loading means for said frictions, and means for limiting the loading of a friction thereby.

66. The combinatign' with a kerf cutting mining machine, of frictionally controlled feeding mechanism including a plurality of frictions, fluid pressure loading means for said frictions, and means for inhibiting loading of either friction above a predetermined limit.

67. The combination with a kerf cutting mining machine, of friction'ally controlled feeding mechanism including a plurality of frictions, fluid pressure controlling" means for each of said frictions, and auton'iatic means responsive to an unbalanced pressure condition in said controlling means for supplying additional fluid thereto.

68. The combination with a kerf cutting mining machine, of feeding mechanism including a plurality 'of frictions, and hydraulic' controlling means for said frictions including a plurality of pistons and cylinders and concentric controlling members for said pistons.

69. The combination with a kerf cutting mining machine, of feeding mechanism including a plurality of frictions, hydraulic controlling means for said frictions including a plurality of pistons and cylinders and controlling members for said pistons, and: means cooperating with said cont-rolling members for limiting the loading movement thereof.

70. The combination with a kerf cutting mining machine, of feeding mechanism therefor including a plurality of frictions, and means for applying andreleasing said frictions including a plurality of coaxially disposed controlling members one movable relative to the other. J

71. The combination with akerf cutting mining machine, of feeding mechanism thercfor including a plurality of frictions,

' and means for applying and releasing said frictions including a plurality of coaxially disposed controlling members each movable relative to the other.

72. The combination with a kerfcutting mining machine, of feeding mechanism therefor including a pluralityrof frictions, means for applying and releasing said frictions including a plurality of coaxially disposed controlling members each'movable relative to the other, and controlling means limiting the effect of movement of said members.

73. The combination with a mining machine, of'a frame, a feed operating member thereon, a cutter chain driving member therein, operative connections therebetween including reaction driving gearing in said frame having elements operatively connected to said members, said reaction gearing having its elements so rel ated that the resistance to rotation of each of said members may, provide the reaction necessary for the driving of the other, and a controlling member for said gearing operable from the exterior of said frame.

74. The combination witha mining machine, of a frame, a feed operating member thereon, a cutter chain driving member therein, operative connections therebetween including rea tion driving gearing in said frame having elements operatively connected to said members, said reaction gearing having its elements so l-elated that the resistance to rotation of each of said members ling members for said feed operating mem ber operable from the exterior of said frame.

7 In a mining machine, a machine frame,

cutting mechanism thereon including a cut- 1 ter bar extending from one end thereof, flexible feeding means including flexible portions extending in opposite directions from the opposite ends of-said frame, and feed operating means driven by the reaction of said cutter mechanism for propelling said frame relative to said flexible portions during cutting. 76. In a mining machine, a machine frame, cutting mechanism thereon including a cutter bar extending from one end thereof, flexible feeding means including flexible portions extending in opposite directions from the opposite ends of said frame, feed operating means drivenby the reaction of said cutter mechanism for propelling said frame relative to said flexible portions during cutting, and means for varying the effect of said reaction as desired.

77. In a mining machine, a machine frame 'slidable on a mine bottom, cutter mechanism thereon including a cutter chain carrying cutter bar extending from one end thereof, flexible feeding means operatively connected between said frame and a point mechanism and in advance thereof for feeding the same laterallyrelative to a mine face, and feed operating means driven by the reaction of said cutter mechanism.

78. In a miningma'chine,amachine frame slidable on a mine bottom, cutter mechanism thereon including a cutter chain carrying cutter bar extending from one end thereof, flexible feeding means operatively connected between said frame and a point in advance thereof for feeding the same laterally relative to a mine face, feed operating means driven by the reaction of said cutter mechanism, and means for varying the effectof said reaction as desired.

79. In a mining machine, of the ,room and pillar type a machine frame slidable on a mine bottom during, cutting, cutter mechanism thereon including a longitudinally projecting rigidly connected cutter bar movable bodily therewith, a horizontally disposed longitudinally extending motor on said frame, flexible feeding means including a feed operatingmember, and driving connections between one end of Said motor and said cutter mechanism and feed operating member including variable reaction cooperating controlling mechanism, said variable reaction mechanism having elements so related'that the re; sistance to rotation of said feed operating member may provide the reaction necessary for the. rotation of said cutter mechanism and vice versa.

80. in a mining machine adapted to be fed laterally, a machine frame slidable on a mine bottom during cutting, cutter mechanism thereon including a longitudinally projecting rigidly connected cutter bar movable bodily therewith, a horizontally disposed lon itudinally extending motor on said frame, flexible feeding means including a feed operating member, and driving connections between the rear end of said motor and said cutter mechanism and feed operating member including variable reaction mechanism and cooperating controlling mechanism, said variable reaction mechanism liavingoelements so related that the resistance to rotation of said feed operating member may provide the reaction necessaryifor "the rotation of, said cutter mechanism and vice versa.

81. In a minng machine, a machine frame slidable on a mine bottom, cutter mechanism thereon including a cutter chain driving sprocket member, feed mechanism thereonincluding a feed operating member, truck driving mechanism thereon including a truck driving @member, a motor on said frame, reaction mechanism driven thereby and connected between said sprocket memher and feed operating and truck driving members, said reaction gearing having elements so related that the resistance to rotaare tion of said sprocket member may provide the reaction necessary for the rotation of said feed operating and truck drivin members and vice versa, means for varying the effect of said reactiomand means including a plurality of frictional devices operable to control both said *feed operating member and said truck driving member.

82. In combination, a mining machine frame, cutter mechanism thereon including a longitudinally extending cutter chain carrying cutter bar, flexible feeding means therefor including a single flexible feeding member having portions extending in opposite directions from the opposite ends of said frame, feed operating means including a feed opera-ting member rotatable on a transverse axis and projecting transversely from one side of said frame, and guiding means for said flexible feeding member including guiding members on the opposite ends of said frame and a cooperating guiding member on an axis parallel to that of said feed operating member and below and in rear of said member, said flexible feeding member having one portion passed from said 'fepd operating member over and beneath said cooperating guiding member to the,

guiding member on the front end of said frame and havmg its other portion passed from said feed operating member to the guiding member on the opposite end of said frame.

83. In combination, a mining machine frame, cutter mechanism thereon including a longitudinally extending cutter chain carrying cutter bar, flexible feeding means therefor including a single flexible feeding member having portions extending in opposite direetions from the opposite ends of said frame, feed operating means including a feed operating member. rotatable on a transverse axis and projecting transversely from one side of said frame, and guiding means for said flexible feeding member including guiding members on the opposite ends of said frame and a cooperating guiding member on an axis parallel to that of said feed operating member and belo'w and in rear of said member, said flexible feeding member having one portion passed from said feed'operating memberover and beneath said cooperating guiding member to the guiding member on the front end of said frame. and-having its other portion passed from said feed'operating member to llll the guiding member on the opposite endof providing coaxial portions and another providing orbitally moving means constituting a connecting means between said coaxial portions, operative connections between one of said coaxial elements and said feed operating member, operative connections be-,

tween another of said coaxial elements and said cutting, mechanism, means for retarding the rotation of one of said two last mentioned coaxial elements, and a power connection with the third coaxial element.

86. In'a mining machine, the combination including a feedoperating member, cutting mechanism, and reaction driving gearing therefor including a plurality of coaxial elements, a plurality of said coaxial ele ments providing coaxial portions and another providing orbit-ally moving means constituting a connecting means between said coaxial portions, operative connections be tween one of said coaxial elements and said feed operating member, operative connections between another of said coaxial elements and said cutting mechanism, means for retarding the rotation of either of said two last mentioned coaxial elements, and a power connection with the third coaxial element.

87 In a mining machine, the combination including a feed operatingmember, a cutting mechanism, and reaction driving gearing therefor including a plurality of coaxial elements, a plurality of said coaxial elements providing coaxial gears and another providing orbitally movlng gear means constituting connecting means between said coaxial gears, operative connections between one of said coaxial elements and said feed operating member, operative connectionsbetween another of said coaxial elements and said cutting mechanism. and a power connection witha third coaxial element.

88. In a mining machine, the combination including a feed operating member, cutting mechanism, and reaction driving gearing therefor including three coaxial elements, two providing coaxial gears and the third orbitally moving gear means constituting a connection between said coaxial gears, operative connections between one of said coaxial elements and said feed operating member, operative connections between another of said coaxial elements and said cutting mech-j 'anism, and a power connection with the third coaxial element.

89.- In amining machine, the combination including a feed operating member, cutting mechanism, and reaction driving gearing therefor including three coaxial elements, two providing coaxial gears and the third orbitally moving gear means having teeth moving at equal angular rates and constitutber, operative connections between another of said coaxial elements and said cutting mechanism, means for retarding the rotation of one of said two last mentioned coaxial elements, and a power connection with the third coaxial element.

- 91. In a mining machine, the combination including a feed operating member, cutting mechanism, and reaction driving gearing therefor including three coaxial elements, two providing'coaxial gears and. the third orbitally moving gear means having teeth moving at equal angular rates and constituting a connection between said coaxial gears, operative. connections between one of said coaxial elements and said feed operating member, operative connections between another of said coaxial elements and said cutting mechanism, means for retarding the rotation of one of said two last men tioned coaxial elements, and a power connection with the third coaxial element,

92. In a mining machine, the combination including a feed operating member, cutting mechanism, and reaction driving gearing therefor including three coaxial elements two providing coaxial gears and the third orbitally moving gear means constituting a connection between said coaxial gears, op erative connections between one of said coaxial elements and said feed operating member, ope 'ative connections between another of said coaxial elements and said cutting mechanism, means for retarding the rotation of either of said two last mentidned coaxial elements, and a power connection with the third coaxial element.

93. In a min-ing machine, the combination including a feed operating member, cutting .mechanism, and reaction driving gearing therefor including three coaxial elements, two providing coaxial gears and the third orbitally moving gear means having teeth moving at equal angular rates and constituting a connection between said coaxial gears, operative connections between one of said coaxial elements and said feed operating member, operative connections between another of said coaxial elements and said cutting mechanism, means for retarding the rotation of either of said two last mentioned coaxial elements, and a power connection with the third coaxial element.

94. In a mining machine slidable on its bottom on a mine bottom, the combination including a feed operating member, cutting mechanism, and reaction driving mechanism for said feed operatingmember and cutting mechanism including orbitally moving means, said reaction mechanism having elements so related that the resistance to r0tation of said feed operating member may provide the reaction necessary for the driving of said cutting mechanisnr and vice versa.

95. In a mining machine, the combination including a source of power, a feed operating member, cutting mechanism, and reaction driving mechanism for the same including driving gear means for each of the same and at least one orbitally movable gear between the source of power and both driving gear means.

96. in a mining machine, the combination including a feed operating member, cutting mechanism, and reaction driving mechanism therefor including driving gear means for each of the same and at least one orbitally movable gear, and an element on which the same is pivotally mounted, said gear constituting-a driving element for one driving gear means and said element constituting a driving element for the other driving gear means. i

97. in a mining machine, the combination including a motor, feeding mechanism, cutting mechanism, variable speed mechanism between the cutting mechanism and the feeding mechanism driven by the motor and operativc to causethe feeding speed and the speed of the cutting mechanism to vary in a definite relation to each other whilethe motor speed remains substantially constant, and means cooperating with said mechanisi for varying each of said speeds.

98. In a mining machine, the combination including a motor, feeding mechanisn'i, cutting mcchanism, variable speed mechanism between the cutting mechanism and the feeding mechanism driven by the motor and operative to cause the feeding speed and the speed of the cutting mechanism to vary in a definite relation to each other while the, motor speed remains substantially constant, and means cooperating with said feeding mechanism for varying each of said speeds.

99. In a mining machine, the combination including a motor, feeding mechanism, cutting mechanism, variable speed mechanism between the cutting mechanism and the feed ing mechanism driven by the motor and operative to cause the feeding speed and the speed of the cutting mechanism to vary in a definite relation to each other while the motor speed remains substantially constant, and means cooperating with said cutting mechanism for varying each of said speeds.

100. In a mining machine, the combination including a motor, feeding mechanism, cutting mechanism, variable speed mechanism between the cutting mechanism and the feeding mechanism driven by the motor and operative to cause the feeding speed and the speed of the cutting mechanism to vary in a definite relation to each other while the motor speed remains substantially constant, and means cooperating respectively with said feeding mechanism and with said cutting mechanism each operative to vary said speeds.

101. In a mining machine, the combination including a motor, feeding mechanism, cutting mechanism, variable speed mechanism between the cutting mechanism and the feeding mechanism driven by the motor and operative to cause the feeding speed and the speed of the cutting mechanismto vary in a definite relation to each other while the motor speed remains substantially constant, and means cooperating with said cutting mechanism to vary the feeding speed.

102. In a mining machine, thecombination including a motor, feeding mechanism, cutting mechanism, variable speed mechanism between the cutting mechanism and the feeding mechanism driven by the motor and operative to cause the feeding speed and the speed of the cutting mechanism to vary'in a definite relation to each other while the motor speed remains substantially constant, and means cooperating with the feeding mechanism to vary the speed of the cutting mechanism.

103. In a mining machine, the combination including'a motor, feeding mechanism. cutting mechanism, variable speed mocha nism between the cutting mechanism and the feeding mechanism driven by the motor and operative to cause the feeding speed and the speed of the cutting mechanism to vary inversely while the motor speed remains substantially constant, and means cooperating

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