US1143144A - Mining-machine. - Google Patents

Description

2 SHEETS-SHEET I.

Patented June 15, 1915.

MINING IIIACIIIIIE.

F. I. s EssIoNs.

APPLICATION FILED FEI. IGI 1909.

@MMIII ImII I .I I I E n/fm@ I F. L. SESSIONS. Mmm@ MAcHlNE.. APPLICATION FILED FEB. I6. 1909.

2 SHEETS-SHEET 2.

i meente.

naam; L, sessions, or COLUMBUS, onro, ,assisteren :ro aan serrant? 'mame courant?, A conrone'rron' or onzin.

Mmmm-nasales and useful-Improvements in Mining-Mal chines, ofwhich the following is a specifica tion, reference being' had therein to the accompanying drawing. u

iThis application relates to mining ma- `chilies, and its object, generally stated, is to provide a machine having' improved means fordriving the cutters, for feeding), the cutters against the coal, and for controlling the feed of thel cutters.

Inthe accompanying drawings I show myinvention embodied in a 4machine of the breast type, but, so far as certain features of the invention are concerned, it-is applicable to machines of otherftypes.

In the drawings Figure 1 is a plan view of the machine, Fig. 2 is a longitudinal vertical .section on the line 2-2 of F ig. 1, the

motor being' shown in side elevation, Fig. 3 is a transverse section on the line 3 3 of Fig. 2, Fig. 4 is a transverse section on the line 4-4 of F ig. 2, F ig. 5 is an elevation of the-left side of the front end of machine, the rear part `of the machine being broken away, Fig. 6 is a section on the line 6-6 of Fig. l, Fig. 7 is a section on the line 7i-7 of Fig.V l, Fig. S is a transverse section of the bed frame taken on the line 8--8 of Fig. 1,

and' F ig. 9 is a fragmentary section Showing. "35

a detail of the construction of the bed frame andrnotor platform., Fig. 10 is a vertical section taken on the lines 10-10 in Fig. l.

The'machine is formed `with two main parts, a bed frame anda carriage or cutter frame. The lhed frame comprisesside bars 1, l which, on their inner faces, are formed with channels or guideway's forthe carriage. These side bars 1, 1 are elevated somewhat above the. groundbeing supported by transverse Aframe'parts 2, 2, each df which comprises a horizontal cross han?! and vertical bars 2b, 2b whichv carry the side-bars 1, 1, the vertical bars 2b, in the case of forward frame parts 2, having inward extensions 2* which engage the said. side bars 1, The trans- Specification of Setters latent.

Y Application led Eebruery 16,1999. SerialNo../1 ?e,201.

Patented Ji" sulestantially parallel to the longitudinal axis of the machine, and a part 3 at the forward end which diverges. By having -'the lower portion of the hed frame iiared outwardly in this manner at the front end, ample room is given for the chain cutters and, at the same time, the latter are more or less surrounded by the hed frame so that accidental contact of an operator with the cutters is prevented.

Un the horizontal bars 2 of the transverse frame parts 2 is mounted or secured a longitudinal bar or plate d which, in addition to its vfunction as a structural member, serves as one element of brake mechanism which will presently be described. The front ends ofthe side bars l are united by a transverse barf. which is formed with or secured to a transversely arrar pedestal 8.

The other main part of the machine, namely, .the carriage or `cutter frame which supports the cutting apparatus, comprises a rear platform 7, a depending bracket 8 ad- Justaloly secured to said platform, chain idly unites the forward ends of the chain guides 9 and constitutes a transverse centinuation thereof, and central guide and support 11 which is connected at its rear end to Ithe bracket 8 endet its forward end its secured by rivets 12 to the front head -l0. The carriage comprising these main parte is slidably mounted upon the bed frame, the rear platform 7 having its side edgesinounted in the channels or ways of the side hars l, while the guide and support \l1 engages guides G? carried by the pedestal 6 of the leedl frame. i

A cutter chainllS is arranged to run in the guides formed by the guides 9, 9 and the front head 10. This chain passes over sprockets 14, 1.5 mounted in the front head 'A 10. and at the rear end of the machine passes over* a large sprocket wheel 16 which supports and drives it. j The sprocket wheel f1? is carried by a vertical shaft 17 mounted in a hearing sleeve 'ldformed 'with orl secured to the platform 7. 'A spur gear 19- is mounted on the upper end of the shaft- 17 and with it meshes a 'gear 20 which is mounted upon the upper end of a shaft 2K1.

Thisllatter shaftv is mountedl in a bearing sleeve, 22 which is-also formed with or secured`\\ to the platform 7. ,The shaft 21 is driven --by a .sprocket wheel 23 mountedr '8= which` engage guides or ways formed by plates 24; bolted to the under side of the platformt/see Fig. 3). The bracket is adjustably'iield in yposition by means of' two screws 25, .25, the heads of which bear against depending lugs 26, 26 carried by the platform 7,',- `and the threads of which engage' nuts "27, 27v seated in sockets formed for them inthe depending bracket part 8 (see Fig. 7 By means o f the adjusting screws 25 that part of the cutterv frame comprising the bracket 8,' chainaguides 9, 9, frontv head 10and sprockets 114, 'l5 can be adjusted in relation to the rear'platform 7, and thus. the desired tension on the cutter chain may readily be secured.

Referring nowto thedevices which drive the sprocket wheel 23, 28 is an endless drive chain which engages said vsprocket -wheel and s guided and supported in a frame 29 which in turn is supported on they central guide and support 11 of the carriage. @This ,secured at its rear end to the bracket Stand llatter guide and support comprises a b ottom horizontal plate 11 and' verticalslde plates 11", 11b, and, as previously stated, is

at its'f-ont end to the .front head' 10.' 'In the trough-like structure formed by the guide and support'll, the chain frame 29 .is slidably mounted. a bottom plate 30 which rests upon the bottom'plate 11 ofthe central guideand support, chain guides 31, 31 which bear against the vertical walls 11b of the central guide and support, and flanges or plates 32, 32 which overlie the chain :'28 to retain it in position. The parts of the chain frame 29 are rigidly secured together by means of rivets 33 as shown in Fig. 6.

At the forward end of the chain frame 29 is disposed a sprocket wheel 34 Afor the chain 28. This sprocket wheel is mounted upon a short shaft which is supported at its lower end by the bottom. plate 30 of the chain frame '29 and at its upper end by `a transverse tie plate 3G which constitutes a' Y The bottoni plate 11*L of the .center guide and supportr` rigidpart of Itheframe 29.

ggd-support 11.

l 'At its rear end the chain guide 29 is fiexibly and adjustably Vconnected to the depending bracket 8 by the following devices:

Said frame comprises 38 is a plate rigidly secured to the frame 29 and is provided with an upstanding lug 30 in which is mounted a screw 40. The head of this screw is formed with' iiangcs 351,40, 40l which are designed to receive the "upper end of a lever. 41 which is mounted upon a pivot 42 carried'by lugs 43, 43 exi tending forward from the bracket 8. A. heavy coil spring 44 is interposed between the head ofthe screw 40 and the bracket S, the latter being provided with a socket to receive the said spring. The lever 41 has a rearwardly extending arm 41a which carries Ia friction face or shoe 41h. This friction shoe of the lever' is disposed adjacent the upper face of the longitudinally arranged plate or bar 4 of the. bed frame and is adapted to be brought into frictional engagement with said bar when the chain frame Z9 is moved .in relation tothe bracket 8, as will be fully explained in the description which is to follow. It is clear that when thechain 2S is driven so as to cause the rotation of'the sprocket wheel 23, the cutter chain will be driven through the gearing mounted on the rear platform, but one of the important objects of my invention is to utilize the chain 2Sy for effecting the movement of the carriage as well as for driving the cutter chain in its guides. This l accomplish by the use of motor mechanism arranged and constructed` as follows.

45 is an electric motor which comprises an external `field frame 45, and an 'armature mounted on a shaftarranged horizontally with a cominutator at its rear end and withia-bevel pinion 46 at itsfront end. It

is unnecessary here to describe in-detail the working parts of the rmotor 'as my invention is not restricted to any 4particular form of kmotoirmechanis-m. The motor or engine, p however, should be constructed so that it may be moved somewhat transversely of the machine for a purpose to be hereinafter described.

The motor isl mounted upon a platform which comprises a horizontal plate 47 which is supported by vertical side plates 4S, 48,

which are slidably supported at their lower edges upon the 4side bars 1, l of the bed frame; The side plates 4S carry dependlng ianges or plates 49, 49 which are slotted cured to l'the-side bars 1, 1 of the bed frame. This bolt and slot construction provides for alimitedfsliding' movement of the platform and `motor upon-the bed frame.v

in the forward position shown in the drawings 'bymean's' of heavy coil springs 51, 51 which are interposed betweentbtplatform .et either side thereof, andv standards 52,1@ 'Whichfajrerigidly secured tothe side bars vOftllebed frame. A; screw 53 is adjustably mounted eachof the standards 52 and car- The platform and motor are normally held.

rio

ideama ries an enlargement to receive the rear end of spring 51. By turning A.the screws 53, the Atension of the springs 51 may be varied as desired. y

The motor is adjustably mounted on the isupporting platform, the field frame 45a I `of the motor being formed with a cylindricalboss or pivot 54 Which fits an aperture 55 formed in the-plate 47 of the platform.- The motor is held down by means of clips or guides 56 and 57 which are bolted to the platform, the clips 56 engaging the platelike extensions 59, 59 of the motor frame, while the clips 57 engage the horizontal part of a bracket which is bolted to the front end ofthe motor frame'. The edges of the extensions 59 and of the bracket 60 are `formed concentric with the pivot 54 so as to 4permit a limited swinging o f the motor on saidpivot. The bevel pinion 46 of the motor meshes with a bevel gearv (il which is` secured to the upper end of a shaft 62 mounted in a bearingsleeve 60a of the bracket 60.

A web 6,0b extends between the horizontal part of the bracket and the sleeve 60a to give strength and stiffness. The sleeve o()5t and web 60hdepend through an aperture 47 in the platform, said aperture being of asize and shape to permit a limited lateralmove p ment of' the sleever 60a.

On the lower end of the shaft 62 is mounted a sprocket Wheel 63 which is disposed in'position to engage the endless drive chain 28, and by swinging the motor and with it the bracket 60 land sprocket WheelI 63, the latter may be 'made -to operatively engage. either the left or the right run' ofthe chain 28.

' For swinging the motor, I provide a Worm 'rack or segment 64, which is secured to the eld frame of the motor at one side, and a worm 65 which engages said segment. This Wormis secured tof'a shaft (i6 which is mounted in bearing, standards G7, G8, which rise from the side of the 69 is a hand Wheel on the rear ,end of the shaft 66, by means of which the latter maybe conveniently turned to swing the'A motor from left a to right, or vice versa.

It will now he clear that if the Vmotor were started when in the position shown in Fig. l. that is with the sprocket wheel (i3 engaging the left run of chain 23, the latter will be moved. and as it passes over the idle sprocket 3l and the rear sprocket 23. the latter will be dri\ en in a direction to cause the forward movement of the cutter chain. It is obvious that if there were no force vomosinff said cutter chain, the only etl'ect of the motor would be to cause the Vchain to'travel around the cutter frame in its guides. But everr when the chain runs idle. thatxis to say. before engaging theA coal, the friction which results from the movement of the chain in its guides constitutes such a force in oppobearings carried by the cross bar 5 motor platform, as 'is clearly shown 1n Fig.

sition to its movement and, therefore, the rotation of the sprocket Wheel 63 1n engagement with chain 28 tends not only to more bodily advance the carriage, the'chain 28 or,

of acting as a rack.. As the force opposing the travelof the cutter chain increases, it is clear that the force tending to advance the carriage also increases and thus 'an automatic feed of the cutters is effected. `This simple automatic feed would perhaps operate. satis-4 factorily under some conditions, but ordinarily in the operation of machines of this sort, the cutters encounter coal or foreign substances of varyingdegrees of hardness, and as the force tending to' advance the carriage increases Witlrthe resistance met by the cutters, it is necessary to provide additional means for controlling the feed of the carriage inorder to prevent the stalling of the machine when unusually hard substances are encountered. I shall now describe a controlling means of this character which is arranged to be operated either automatically, or by the operator. n

70 is a vertical shaft mounted in suitable pedestal 6 of the bed frame. 71 is an eccentric arranged on said shaft 70 in position to engage one side of'the central guide and support 1l of the carriage. ofl shaft 7 carries a lever.'arm 72 which is connected to a link 73 extending toward the rear and provided at its rear end with a vandle 74. This link 73 passes through a guide standard 75 rigidly secured t-o the motor platform, and carries a collar 7G arranged to be engaged by the standard 75. 77 is a paWl pivotally mounted on the standard 75 and arranged to` engage a shoulder 78 on the link 73. The operator, by grasping the handle 74, may draw the link back and cause theeccentric to engage the guide l1 of the carriage, and thus oppose the advance of the carriage. However, this will be acconr plished automatically with the construction which has been described, for it is clear that when the force tending to advance the carriage increases to a certain extent, the ten` sion of the springs 5l will be overcome and the motor and its supporting platform will slide' backward on. the bed frame. During this movement the link 73 is drawn hackward by reason of the engagement of the standard 75 with the collar 76 of the link,

and.

The upper end v the cutter chain in its guides but also to t 7o to speak more accurately, the left run there.

and the braking action of the eccentric 7l is ner.. Then, with the motor in the position shown in Fig. l, so as to bring the sprocket wheel 63 into engagement with the left run of the drive chain 2S, the operator starts the motor. T he sprocket 63 is turned in a clockwise direction thus moving the left run of the chain 2S forward and driving the sprocket 23 which, through the gears 2O and 19 drives the main sprocket wheel 16 in an anti-clockwise direction so as to move the cutters forward. The resistance offered to the movement of the cuttersin the form either of friction 'inthe chain guides or of auch' friction combined with the ,resistance ofthe coal, in case the cutters have been initially placed in' contact with the face of the coal, will cause the tension exerted on the left run of the chain 28 to exert a force Y on the carriage of the machine, tending to move the cutter frame bodily yforward against the coal. The chain 28 acting thus is in thc nature of a traveling rack and serves to simultaneously move the cutter chain in its guides, and to bodily advance lthe cutter frame against the coal.

The continued operation of the motor causes theV gradual feeding forward of the carriage, thus undercutting the coal in the well known wayin' which s uch operation is effected by breast machines. If at any time y during the advanceof the carriage, the cutters should encounter substances of unusual hardnessso that reslstance to the movement of the cutters were gradually increased, thev force tending to-draw the carriage forward would correspondinglv increase, and might increase to such an extent as to stall the motor, or exceed the limit at which the machine could be operated with safety. This tendency, however, is overcome and such a result vis prevented by the automatic operation of the eccentric brake," That is to say, when the resistance to the cutters becomes so great that the tension in the chain 28 is sufficient to overcome the springs 51, 51, the motor platform is caused to slide f backward somewhat'on the bed frame, thus Y co . into acti bringing the eccentric brake 71 into operation in the manner hereinbefore described.

The feed of the cutter frame is thus retarded for a.tiIne'until the cutters have freed themselves somewhat and the tension in the chain 28 has diminished. The springs v51 then cause the motor platform to move forward again to its normal position, which'forward movement causes the unlocking of the. eccentric brake 71 through the action of the pawl 77 which engages the link 73.

The advance of the carriage thus continues. the eccentric brake 71 being brought according to the nature of the coal or other substance being encountered .by thev cutters. It will, of course, be understood that'the ffii.. J

autoniatically from time to time,

brake 71 can be manually actuated by the operator at any time, if that becomes desirable or necessary in handling the machine.

When the carriage has been fed forward to the limit of its travel and the cut'completed,the operator effects the retraction of rection, the chain 28 continues to be driven in the same direction, but the tension in that part of the right run of the chain" 28 between the sprocket wheel 63 and the sprocket wheel 34, aswell as the tensionfin the left run of the chain 28, .tends to draw the sprocket wheel 37 bodily backward. As this sprocket wheel is mounted in the chain frame 29, which is slidably supported in the vcentral guide and support 11, it is clear that the tension in the two runsof the chain 28 will exert a backward thrust on the chain frame 2 9. Said chain frame isl connected to the rear platform bracket 8 by the screw 40, lever 41 and coil spring 4e as previously described, 'and the effect of the backward thrust on the chain frame 29 is, therefore,

l,to force the rear platform, and with it the entire carriage backward. If,however, the

Aretraction of the carriage 'should encounter any unusual resistance, such, for example, as would resultfrom the falling of coal on the cutters, the tension of the spring 44l would be overcome by 'the thrust `of the chain frame 29, and the latter wouldhave a corresponding sliding movement in vthe support 11. Such movementwould cause the swi 'ng of the lever 41, which, it will be recal ed,`is mounted on the platform bracket 8, so as tobring thebrake shoe 41binto engagement withthe longitudinal bar 4 of the bed frame." Theretraction of the carriage would thus be stopped, until he obstruction were removed, and anyundue straining or breakage of the machine prevented.y

From a consideration of the construction whch'has been described, it will be apparent that the amount of force orpressure exerted'by the motorfmto vdrive the cutting devices will have a certain deinite predetermined relationship to the 4amount of force or pressure exerted -by the motor to feed the carriage forward. In using the terms force or pressure, I desire to clearly distinguish from themeanings expressed by other terms suchnas power or energy. AsV stated above. the cutter drivin y force and tie car- 12 5 riage feeding force will e definitely propormamas amounts ot' power received by the cutting devices and by the carriage, respectively, wii-lA vary greatly relatively to each other in accordance with the speeds at which the conditions oit use permit the two devices to travel. if the resistance to feeding is great, the rate of feeding is correspondingly slow and the actual power transmitted to the carriage is very small but the amount ot torce or pres sure transmitted to the carriage to feed it remains definitely proportioned to the amount of pressure transmitted to the cutting devices. And it the resistance to feeding is very small. the rate of feeding is correspondingly great and thevamount of power expended in feeding the carriage is relatively large; but the force applied to feeding the carriage'remains, as before, denitely proportioned to the torce transmitted to drive the cutting' devices.

"it 'will now be understood that the machine which' have produced not only efi'ects the automatic feed ot' the carriage, but also automatically controls the feed according to the character of the coal or other substances which the cutters engage. ln fact, the power transmitting mechanism which I have provided is a diterential one which serves to transmit torce in definite predetermined proportions to the cutters to drive them and to the carriage to 'feed it forward. The amounto the carriage feeding force is dependent upon the resistance offered to the cutters and the amount ot' torce transmitted tothe cut# ters is dependent upon the resistance offered to the forward tecdingof the carriage. Furthermore, this result is secured with mechanism that `remarkably simple. dispose entirely with all ot' the ordinary feeding apparatus. such as racks and pinions, shafting and gearing vto dri them, which parte, as ordinarily used. are absolutely positive in their action and in no wise automatically ac- -commodating in relation to .the resistance encountered by the cutters. These feeding -mechanismm as ordinarily used, comprise vt'eed worms. gearing, shafts, clutches, etc., together with many details incident thereto, and are responsible tor a large part of the .labor and expense incident tothe manufacture ot such machines. y

Many ot the detail features, both of the construction and oi the operation' of my machine. may be va rind without departing from nl v invention. it is clear, tor example, that the carriage might he retracted by reversing the motor and maintaining the sprocket wheel G2 in engagement with the left run of the chain 2S. This method of operation, hoive fr. would cause the cutters to move haelt ad dining the retraction of the carriage. d as this is usually not desirable, l prefer to retract. 4the carriage by swinging the motor so as to bring the sprocket 63 into engagement with the right run of the drive 65 chain 28, the motor continuing to run in the same direction.

The subject-matter of this application is, in "many respects, like that of my forfeiteda application, Serial llo. 138,159, tiled .lanuary 7, 1903. c

What I claim is:

l. In'a mining machine, the combination of a bed frame', a carriage movable forward and back thereon, cutters mounted on the 75 said carriage, a motor, a train of power transmitting elements connecting said motor to the cutters, one of said train of elements being mountedon the be'd frame, another on the carriage and one of said elements being arranged both to transmit power to the said cutters and to move the carriage along' the l bed frame.

2. In 'a mining machine, the combination Vof a bed frame, a carriage movable forward and back thereon, a power actuated driving member mounted on one said parts, an endless chain operatively niounte'd on the other of said parts and arranged to operate both as a carriage feeding element and as a cutter actuating element, and cutters actuated by said chain.

3. In a mining machine, the combination of abed frame, a carriage movable forward and back thereon, a cutting apparatus mounted on said carriage, a motor, an endless chain mounted on said carriage and arranged to operate both as a carriage feeding element and as a power transmitting element, power 'transmitting devices interposed between said endless chain and said motor,l and power transmitting devices interposed between said endless chain and said cutting apparatus.

4. In. a mining machine, the'combination ol" the bed-frame, the endless chain carrying cuttersfthe endless-chain for advancing the cutters bodily along the bed, and means connecting the tivo chains for transmitting the power from the latter to the former, substantiallyas set forth.

ln a mining machine, the combination of the bed-trame, the carriage, the cutting apparatus on the carriage, a power wheel on the hed frame, a carriage moving mechanism on the carriage, actuated by the said power wheel, and means connecting the cutting apparatus to the carriage-moving mechanism; substantially as set forth. l

6. l'n a mining machinc, the combination of thc bed-trame, thc carriage, the cutting apparatus on the carriage, the endless movable chain mounted longitudinally of the carriage, means for connecting the cutting apparatus to said chain and adapted to transmit variable loads from the cutting apparatus to the chain, and the driving devices v for the chain, substantially asset forth.

7. ln a mining machine,A the combination izo of the bed-frame, the carriage, the cutting apparatus on the carriage, the carriage-mov- ,ing mechanismen the carriage, means con- 'neet-111g the carriage-moving mechanism to the cutting apparatus, and a continuously speeded driving mechanism connected to the earrmgcmoving mechanism and transmitting power therethrough to the cutting apparatus, substantially as set forth.

8. In a mining machine, the combination of the bed. the carriage, the cutting apparatus on the carriage, the Acarriage-moving mechanism, power transmitting 'devices connecting the carriage-moving mechanism with the. cutting apparatus. and a continuously acting driving mechanism primarily actuat-y ing the carriage-moving mechanism and ti nsmitting power therethrough to the cut-- ting apparatus. substantially as set forth.

' E). In a mining machine, the combination of a bed-trame, a carriage movably mounted on said fame, a power actuated driving member mounted on one of the said parts, transmission mechanism operatively mounted on the other of the said parts, and cutters arranged to be actuated by the transmisf sion mechanism, the said driving member" carriage movement, whereby said chain is` ing member being arranged to apply torce to said chain in the general direction of the carriage movement. whereby said chain is effective, both to drive the cutters and to move the carriage. 1

`11. In ay mining machine, the combination oi"a bed-frame, a carriage movable forward and back thereon. a power actuated driving member Vmounted on the bed frame, an endless drive chain operatively mounted on the carri age longitudinally thereof, a cutter chain operatively mounted on the carriage, and

transmission devices between the drive chain and said4 cutter chaimthe said driving member being arranged to apply force to the drive chainin the general direction of thf` effective both to drive the cuttersandirto move the carriage.

1. In a mining rnat'thine,` the' combinationy of a bed frame, a carriage movable forward and'back thereon, a power actuated driving member movably mouhted on the vbed fra-me. an" endless drive chain ,operatively mounted on the carriage with two runs arranged lonlitudinally thereof, a cutter chain opera.-

tively mounted on'the carriage, and transmission devices between the drive chain and said cutter chain, the said .driving member being movable into operative engagement with either osaid longitudinal runs of the drive chain, wherebyA saidchain is effective to drive the cutters and to both advance and retract the carriage. l

13. In a. mining machine, the'combination of a stationary frame, a cutter frame movably mounted on said stationary frame, cutters operativelyv mounted on the cutter' frame, and feed mechanism for the cutter frame comprisin a power actuated driving. member mounte on one of the said frames, and a driven member normally held against bodily movement relative to the other frame, said driven member being arranged to transmit power from the power actuated member to the cutters.

14. In a mining machine. the combination of the bed, the carriage, the cutting apparatus on the carriage, the carriage-moving mechanism, comprising' an endless chain on the carriage', means connecting said endless chain to the cutting apparatus. and an automatic brake adapted to be brought into action upon the increase ot" tension of the' chain to resist-the movement of the carriage, substantially as set forth.

15. In a mining machine, the combination of a bed frame, a carriage movable forward and back thereon.l cutting apparatus mounted on the said carriage. an endless chain mounted on said carriage and arranged both to operate as a carriage feed element and for 'transmitting power to said cutting apparatus, a motor, power transmitting mechanism connecting said motor withwsaid endless chain ou the carriage,,power/transmitting mechanism connecting Said 'chain withsaid cutting apparatus, and'means for controlling,r the, tension on the active run of said endless chain. t,

16. In a mining machine,.thecbmbination of a bed frame, a carriage movable forward and back thereon, a. power actuated drivingl member mounted on one of the said parts, an endless chain operatively mounted upon the other of said parts and arrange to operate both as ay carriage feeding element' Vand* vas a cutter actuating element, cutters actuatedby said-chain, andan automatic brake. adapted to be brought into action upon the increase of tension of the chain to resist -the movement of the carriage.

`. 17. Tn a mining niachirnle,I the combination ot a stationary frame, al cutter frame movably mounted on said stationary frame, cutters operatively mountedv on l'the cutter frame, a. motor, a power ti :tnsmitting mechanism interposed between the motor and the cutters to drive them and the cutter frame to feed it forward or backward, and automatically acting means supplemental to the movement of the cutter frame.

' said automatically acting means being concutters to drive them and the cutter frame trolled by the variation of the driving force applied to the cutters.

18. In a mining machine, the combination 1 a stationary frame, a cutter frame movably mounted on said stationary frame, cutters operatively mounted on Athe cutter frame, a "motor, power transmitting mechanism interposed between the motor and the to feed it forward and backward, and a brake device supplemental to the powertransmitting mechanism for cont-rolling` the 19.* In a mining machine, the combination 0f a bed frame, a carriage movable forward and back thereon, a power actuated driving member mounted on one ofthe said parts, an endless chain operatively mounted on the other of the said parts and arranged to operate both as a'carriage feeding element and as a cutter actuating element, cutters actuated by said chain, and a brake device for' controlling the movement of the carriage.

20. In a mining machine, the combination of a bed frame, a"carriage movable forward and back thereon, a power actuated driving member mounted 'on one of the said parts,

. an endless chain operatively mounted on the other of the said parts and arranged to o perate bothas a carriage feeding clement and as a cutter actuating element, cutters actuated by said chain, and means controlled by the variation of the tension in the drive chain for automatically controlling the movement of the carriage. j,

2 1. In a mining machine, the combination of a'bed frame, a carriage movable forward and back thereon, a power actuated driving member mounted on one of the said parts,

' .an endless chain operatively mounted on the other of the said parts and arranged to operfate both asa carriage feeding element and 1as a cutter actuating element, cutters .actuated .by said chain, and automatic devices for controlling the forward movement and the backward movement of the carriage.

g 22. In a mining machine, the combination of a bed frame, a carriage movable forward and back thereon` a power actuated driving member mounted on one of the said parts,

"anendless cllain operatively mounted on the other of tl1e`said parts and arranged to oper ate'both vas a carriage feeding element and 4ist asaA cutter actuating element, cutters actuated said chaim'and automatic devices controlledfby the variation of the tension in the drive chain for controlling the forward movement and the backward movement of the carriage.

23,. In a mining machine, the combination of astationary frame, a cutter frame movably mounted on saidfstationary frame, cutin all positions of Ythe cutter frame for conbackward movement thereof.

24. In a mining machine,`the combination of a bed-frame, a carriage movable forward and backward thereon, cutter mechanism mountedon the carriage, a motor` and power mechanism interposed between the motor on the one hand and the cutter mechanism and the carriage on the other hand for differentially transmitting the force of'the motor in predetermined. proportions to the said 'cutter mechanism to driverit and to t-he Said carriage to feed it forward.

vIn a mining machine. the combination of a bed frame.l a carriage movable forward and backward thereon. cutter mechanism mounted on the carriage, a motor, power mechanism interposed between the motor on the one hand and the cutter .mechanism and trolling the forward movement and the the carriage on the other hand for dili'erentiallv transmitting the force of the motor in predetermined proportions to thesad cutter mechanism to drive it and to the said carriage to fccd it forward. a brake for 4resisting the forward movement of the carineails fol ilo Sistine' the forward movement of the carringe.. and automatically acting means for applying the brake upon the transmission to the carriage of a, predeteri'nin'ed feeding force. 27. In a mining machine. the combination of a bed frame, a carriage movable forward' and backward thereon, cutter mechanism mounted on the carriage, a longitudinally extending endless drive chain on thecarringe operatively connected witlrthe cutter mechanism, a motor on'A Ythe bed frame, a sprocket wheel meshing with thc drive chain and operatively connected with the motor; the wheel being movable longitudinally of the bed frame, means for resisting the longitudinal movement of the wheel, and means dependent upon the movement of the xsprocket wheel against the infiuence of= the extending endless said resisting means forretarding the movement of the carriage. -g y 28?' In a mining machine, the combination ofl a bed frame,'a carriage movable forward and backward thereon, l cutter mechanism mounted on the carriage, a longitudinally riage operatively mechanism, a motor longitudinally-movable on the bed franife, means for resisting the longitudinal movement of the motor, a sprocket wheel movable with the'motor and meshing with the drive chain, and means decarriage.

pendent upon the-movement of the motor againstv the influence of the said resisting means for retarding the movement of the 29. In a mining machine, the combination of a bedframe, a carriage movableforward and backward thereon, cutter mechanism mounted on the carriage, a longitudinally extending endless' drive chain on the car- `riage operatively connected with the cutter l i mitting the force of the motor in predetera motor, a sprocket wheel posimechanism,

the runs of the drive chain tioned vbetween and operatively connected with the motor,

. guides may and means for-moving the motor and the sprocket Iwheelvbodily` to bring the wheel 'nto mesh with either chain run, whereby the re-action. of the chain on its guides may feed the carriage either forward or backward as desired.

30. In a mining machine, the combination of a bed frame, a carriage movable forward and backward thereon, cutter mechanism mounted on the carriage, a longitudinally extending endless drive chain on the earriage operatively connected with the cutter mechanism, a motor movable longitudinally of the bed frame, means for resisting the longitudinal. movement of the motor, a sprocket wheel positioned between the runs of the drive chainand operatively connected with the motor, means for moving themotor and the sprocket wheel bodily to bring the wheel into mesh with either chain run, whereby the re-action of the chain on its feed the carriage either forward or backward as desired, and means dependent upon the movement of the motor against the infiuence of the said resisting means for retarding the movement of the carriage,

31. In a mining machine, the combination of a bed frame, a cutter frame movable forward and backward on the bed frame, power driven cutter mechanismen the cutter frame, two parallel longitudinal feed elements on the cutter frame, a sprocket wheel on the bedv drive chainon the car-y connected with the cutter same direction, and means for moving the sprocket wheel into mesh with either feed element to feed the cutter frame in either direction as desired.

32. a mining machine, the combination of two" fra-mes one movable longitudinally with respect to the other, power driven cutter mechanism on the movable frameftwo parallel longitudinal feed elements. on one of the-said frames, other ,of said frames positioned between the two said feed. lements, a` motor connected with the sprocket wheel for driving it always in the same direction, and means for moving the sprocket wheel into mesh with either feed element to feed the movable frame in either direction as desired.

33. In a mining machine, the combination lof a cutter frame, a cutter mechanism on the frame, a motor, and power mechanism interosed between the motor on the one hand 'and the cutter mechanism and cutter frame on the other hand for differentially -tran'sa sprocket wheel on the v bodily.

34. In a mining'miclhine, the combination of a` cutter frame, a cutter mechanism on the frame, a. motor, power mechanism interposed between the motor on the one hand and the cutter mechanism and cutter frame on the other hand for differentially transmit-ting the force of the motor in predetermined proortions to the cutter mechanism to drive it Aand to the cutter frame to move it bodily, means for retarding the bodily movement of the cutter frame, and manually controllable means for applying and releasing the retarding means.

35. In a mining machine, the combination of a cutter frame, a cutter mechanism on the frame, a motor, power mechanism interposed between the motor on the one hand and the cutter mechanism and putter frame on the other hand for differentially transmittingthe force of the motor in predetermined proportions to the cutter mechanisml in presence of two witnesses. I

" y FRANK L. SESSIONS.

Witnesses; Y

JAS. Gr. CHANDLER, It. R. DUNLOP.v

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