US2049445A - Mining machine - Google Patents

Description

lAug. 4, 1936.

M, P. HOLMES.

MINING MACHINE Filed oct. 30,1933

4 Sheets-Sheet l M. P. HOLMES MINING MACHINE Aug. 4, 1936.

4 Sheets-Sheet 2 Filed Oct. .'30, 1935 Y Innen/fm@ Mwefaime RIN.'

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Allg. 4, 1936. M P, HOLMES 2,049,445

MINING MACHINE Filed oct. 3o,y 1955 4 sheets-Sheet 3 any Aug. 4, 193.6. v M p, HOLMES 2,049,445

MINING MACHINE Filed Oct. 30, 1953 4 Sheets-Sheet 4 uw Il 19.*) hw MW umu...

w ,0- 'MMM' Patented Aug. 4i, 1936 uga GFFHCE MENING MACHINE Morris l?. Holmes, Claremont, N. lll., assigner to Sullivan Machinery Company, a corporation of Massachusetts Application October 30,

37 Claims.

The invention relates to mining machines, and

more particularly to improvements in the swinging mechanism for the cutter bar o1" a machine for cutting coal. Y

An object of this invention is` to provide an improved cutting mechanism. Another object is to provide an improved cutter bar swinging mechanism. Yet another object is to provide an improved cutter bar swinging mechanism having improved driving and controlling means, the improved driving means having incorporated therein improved speed reducing means. Still another object is to provide an improved cutter bar swinging mechanism having embodied therein improved speed varying means whereby the cutter bar may be swung at variable speeds. Still another object is to provide in a mechanism of the above character improved speed reducing and speed varying means of the so called intermittent, variable-speed, continuous-wedge type. Still another object is to lprovide an improved cutter bar swinging mechanism for a coal mining machine of the flexibly fed, floor cutter type whereby the cutter bar may be swung wholly independently of the machine feeding means. A still further object isY to provide Van improved independent power swing for the cutter bar of a mining machine of the longwall type. These and other objects and advantages of the invention will, however, hereinafter more fully appear. Y

In the accompanying drawings there are shown for purposes of illustration one form and a modication thereof which the invention may assume in practice.`

In the drawings,-

Fig. 1 is a plan View of a mining machine having embodied therein the illustrative form of the improved cutter bar swinging mechanism.

Fig. 2 is a side elevational view of the mining machine shown in Fig. 1.

Fig. 3 is an enlarged fragmentary View of the cutting end of the mining machine shown in Fig. 1, Yparts of the driving gearing being shown in horizontal section. l

Fig. 4 is a longitudinally extending vertical sectional view taken substantially on line ll-ll of Fig. 3.

Fig. 5 is a transverse vertical sectional View taken substantially on line 5 5 of Fig. 3.

Fig. 6 is a transverse vertical Vsectional view taken onV line l--l of Fig. ll.

Fig. 7 is an enlarged horizontal sectional view taken on line l-l of Fig. 5.

Fig. 8 is a detail sectional view showing the 1933, Serial No. 695,812

(Cl. 26E-3o) control means for the cutter chain drive clutch. Fig. 9 is a detail View taken on line 9--9 of Fig. 8.

Fig. 10 is a detail sectional View showing the control means for the variable speed device.

Fig. 11 is a detail view taken on line H-ll of Fig. 10V.

Fig. 12 is a vertical sectional View taken on line l2--l2 of Fig. 3.

Fig. 13 is a detail vertical sectional view taken l0 Fig. 15 is a fragmentary side elevational view 15v of the machine shown in Fig. 14.

Fig. 16 is a horizontal sectional view taken on line l--ll of Fig. 15.

n this illustrative embodiment of the invention the improved bar swinging mechanism is 20 shown embodied in a coal mining machine of the flexibly fed, continuous cutter, floor cutter type,

although it will be evident that the improved swinging mechanism may be embodied in mining machines of various other types. The mining machine disclosed herein is a longwall machine generally similar to that disclosed in a copending application Serial No. 555,328, filed Aug. 5, 1931, now matured into Patent No. 1,968,769, granted July 31, 1934, and herein generally comprises a machine frame l having a plane bottom surface 2 on which the machine is slidably supported for universal movementl over the mine iloor. As is usual in longwall coal cutting machines, pivotally mounted on one end of the machine frame at 3 for horizontal swinging movement relative thereto is a horizontal plane cutter bar having guided for circulation about its margin a usual cutter bit carrying cutter chain 5, the cutter bar being swingable'about its axis fio into'substantially right angle positions at either side of the machine frame and a central position extending lengthwise of, the machine "frame as is usual in floor type longwall mining machines. The machine frame l in this instance comprises a central motor sectionY 6, a cutter carrying section l on which the cutter is pivotally mounted and a freed section 8, the motor and feed frame sections being supported on a separate bed frame 9 and the motor section being 50 arranged between the cutter and feed frame sections, these sections when unitediorming a low compact machine frame. The machine is fed over theY mine floor by `means of a horizontal feed drum lil arranged on a vertical axis on theV feed frame and cooperating with a feed cable As the method of feeding the mining machine and the particular driving and controlling means for the feed drum are clearly described in the copending application mentioned above, further description thereof is herein considered unnecessary.

The means for driving the cutter chain about the margin of the cutter bar in the present instance comprises a spur pinion l5 xed to the motor power shaft and meshing with a spur gear I6 keyed at |1 to a horizontal longitudinally extending shaft I8 suitably journaled within the cutter frame 1. Formed integral with the gear I6 and driven thereby is a spur gear |9 meshing with a spur gear 23 secured to a sleeve 2| suitably journaled within the cutter frame, as shown in Figs. 3 and 4. Alined with the sleeve 2| is a shaft 22, this shaft being journaled at one end Within the sleeve 2| and at its opposite end within the cutter frame. The sleeve 2| is connectible in driving relation with the shaft 22 by a jaw clutch member 23 slidably mounted on the shaft 22 and splined thereto, this clutch member having clutch teeth connectible with clutch teeth formed on the sleeve 2|. The clutch member 23 is provided with improved operating means to be later described. Formed on the shaft 22 and driven thereby is a bevel pinion 25 meshing with a large horizontal bevel gear 25 journaled on a vertical shaft 26 secured within the cutter frame. Secured to the hub of the bevel gear 25 and driven thereby is a chain sprocket 21 which engages and drives the cutter chain 5 in a well known manner. The operating means for the clutch member 23 may assume various forms, but in this instance comprises a shipper yoke 28 pivoted at 29 on the cutter frame and having .a lever arm 30 pivotally connected at 3| to a link 32. 'I'he link 32 is pivotally connected at 33 to a crank 34 fixed to a horizontal operating rod 35 extending longitudinally of the machine frame and suitably journaled inthe bed frame 9. Fixed to the rod 35 at 36 is ,an operating handle 31 conveniently 1o.- cated at the feeding end of the machine remote from the cutting mechanism.

The improved pivotal mounting for the cutter bar 4 comprises a lower annual bearing member 38 formed integral with the bar and journaled on a bearing sleeve 39 surrounding the'vertical shaft 26 and supported at the bottom of the cutter frame. The cutter bar has also an integral upstanding portion 4i) secured by screws 4| to a bracket member 42 having an upper annular bearing member 43 journaled on a bearing sleeve 44 likewise encircling the shaft 26 and supported at the top of the cutter frame. It will thus be seen that the bearing portions 38 and 39 form a pivotal support for the cutter bar and the cutter bar is guided during its swinging movement by superimposed arcuate anges 45 formed on the cutter frame and engaging grooves 46 formed on the upstanding frame portion 40 of the cutter support bracket. Formed below the cutter bar is a depending frame support 41 which slidingly engages the smooth upper surface of the bottom plate 48 of the cutter frame. It will thus be seen that the cutter bar is mounted for horizontal swinging movement about the vertical axis 3, i. e., the axis of the vertical shaft 26.

Now referring to the improved swinging mechanism for the cutter bar, it will be noted that secured to and driven by the longitudinal cutter drive shaft |8 is a worm 50 meshing with a horizontal worm wheel 5| located above the bevel gear 25 and having its hub portions journaled on bearing sleeves 52, 52 supported by a sleeve or tubular shaft 53 surrounding the vertical shaft 25. The sleeve is connectible to the worm wheel 5| for driving thereby by means of a multiple disc clutch 54 housed within the worm wheel and having clutch plates keyed to the worm wheel interleaved with clutch plates keyed to the sleeve. The improved means for operating the disc clutch 54 whereby the sleeve 53 may be driven from the worm wheel through a wide range of variable speeds will hereinafter be described. Improved speed reducing means is provided between the sleeve 53 and the cutter bar bearing support 42 and comprises an eccentric portion 55 having rotatably mounted thereon through an anti-friction bearing 56 an annular member 51. Secured .as by bolts 58 to a horizontal annular web portion 59 of the cutter frame is an annular guide frame 60 having a plurality of radially located guide chambers or slots 5| in each of which there is slidably guided a plunger 62. These plungers engage in sliding abutting relation the exterior periphery of the ring member 51 and are formed at their outer extremities with tooth-like projections 63 engageable, with a wedging action, with the inclined surfaces of tooth-like portions 64 formed on the upper annular bearing member 43 of the cutter bar mounting. This mechanism forms a speed reducing mechanism between the sleeve 53 and the cutter bar bearing support, and as the eccentric portion 55 is revolved by the worm wheel 5| the plungers S2 are driven radially outwards through the guide frame 60 so that the ends of the plungers engage the inclined sides of the tooth-like projections 64 and thereby transmit rotary motion to the cutter bar bearing member 43 to swing the cutter bar horizontally about the axis of the vertical shaft 26. The operation of the tooth-like plungers is continuous and the elements of this speed reducing mechanism form what might be termed a continuous-wedge, speed reducing mechanism.

The mechanism for controlling the disc clutch 54 to obtain a variable speed drive through this clutch and to provide additional speed reducing means includes on the upper hub portion of the worm wheel 5| a cam-like portion orY eccentric 65 with which engages a sliding member or plunger 66 guided in a guideway 61 formed in the transverse web portion 53 of the cutter frame. This plunger has an integral internally threaded portion 68 having adjustably threaded therein at 59 a rod 15. This rod has an enlarged portion 1l with which engages a trunnion device 12 pivotally connected at 13 on a bell crank 14.V The other arm of this bell crank is pivotally connected at 15 to a swingable clutch shipper yoke 15. This shipper yoke engages an annular clutch applying member 11 encircling the hub of a member 13 encircling the shaft 25, and this member 11 effects application of the disc clutch through a, ball bearing clutch applying member 19. The arms of the yoke act as a lever between the members 11 and 18 so that when the yoke 15 is swung upwardly the member 11 is moved upwardly toeffect application of the clutch. The cylindrical enlargement 1I of the rod 13 forms a shoulder 8i), and a spring 8| is compressed between the outer face 82V of the threaded portion 53 of the plunger and a collar 83 slidably guided upon the rod 1) and normally engaging the shoulder 33 of the rod enlargement. The enlargement 1| of the rod passes through thertrunnion device 12, and this 75` trunnion device comprises, as shown inv Fig. 13; elements 84,184 having concave vrecesses slidably engaging the cylindrical body of the rod enlargement i'||, and these elementsv are pivotally connected at i3v to the bifurcated arm 85 of the bell crank 14. The bell crank l is pivotally mounted at86 on a reciprocable operating rod 8l, herein a speed adjusting member, guided within a groove 88 formed in the cutter frame. The means for moving'the member 8l inwardly or outwardly to vary the position of the bell crank fulcrum` 99 herein, in the-preferred form of the invention, comprises a lever arm 89 pivotally. connectedat 90 to the memberv 97'and mounted for swinging movement about a vertical axis on a vertical shaft 9|. Also mounted on the shaft 9| is a similar lever arm pivotally connectedat 92 (see Fig. 10) -to a reciprocable. operating member 93 guided at E14-'within the'cutter and bed frames. The member 93 is connected by an adjustable threaded connection 95 to a reciprocable operating member 96 guided within a guideway 91- formed in an upstanding portion-9 of the bed frame 9. Interposed'between the upstanding portion 98 of the bed frame and aV collar 99 secured to the member 96 is a coil spring |99 fornormally urging the member 95 toward its forward position. Pivotally connected by .a pin and slot lill to the outer bifurcated end of the member 96 is an eccentric operating member or cam |92 projecting within andengaging the sides of the guideway 9'!! in the up-standing frame portion 98 and having an operating lever |194 conveniently located adjacent the lever 3l at the feeding end of the machine. When the lever |94 is in the position-shown in Fig. l1 the member 9G is held in its innermost position by the spring |99, but when the eccentric |92 is swung laterally the member 9B is-moved rearwardly against the-ten- Y is moved :axially to the right, swinging the bell crank 'lll about its pivot and thereby swinging the shipper yoke 'l upwardly to apply the disc clutch 54. Movement tothe right of the rod l0 will'result in the transmission of no power to the clutch shipperv 'i6 untilthe collar 83 engages the trunnion device "l2, but further movement to the right Vof the rod will apply lpressure to the clutch and varyv the degree of compression of the Y spring 8|. It is therefore evident that as the cam 65 revolves, the shipper 7S is swung back and forth intermittently to apply the-disc clutch 54, and asa result, the sleeve 53V is intermittently rotated at a relatively low speed.V As above mentioned, the member 8l `provides an adjustable fulorum for the bell crank M, andupon movement of thismember S'l-rby the-handle |94 in an axial direction to theright'in Fig. 12 the interval of engagement of the .plunger 65 withfthe cam 65 will be varied, and as a. result, thetime of application of the disc clutch 54 will be correspond-V inglyv varied. Upon movement of the bell crank fulcrum Bto the right to a position suicient to bring the plunger 66 out of engagement with the cam, the discclutch 54 is maintained in released position during rotation of. the'cam. When the member 8l is moved to the left so far that the collar83. continuously presses under the pressure of the springv8| vvagainst the trunnion device. 12, continuous application of theclutch will take place andthe spring 8| will compress during each revolution,` of the-caman amount substantially equal. to thevfull throw of the cam; but since the load of the spring is above the minimum necessary to eiectpowerL transmissionA throughxthe clutch discs-.therewill be no release evenwhen the lowest pointv in ythe cam is` opposite the plunger S6. By moving the member 81A graduatedA amounts toward theright in Fig. l2,V the period .of drive duringeach revolution ofthe cam maybe progressively reduced until it isentir'zly discontinued. Therefore the drivethrough the disc clutch 54 may be so adjusted as toobtain a continuous maximum low speed drive and-an intermittent low speed drivefrom said maximum low speed down to zero. As a result, the cutter bar may be swung at a maximum low. cutting speed andat intermittent low cutting speeds between'said maximum low speed down to zero.

In the modification shown in Figs. 14, 15 and 16, the speed varying member 8.1 is provided with a reduced threaded end Illl threadedly connected to. a nut member |91 having-an operatingv handle |98v and'` having threadedengagement at |09 with the cutter frame, the memberv 81 being'adjusted directly by the rotatable nut and screw connection, the connections 89, 93; 96, |02 and |94having been omitted. Also instead ofthe connections shown in Fig. 8 for operating the cutter chainclutch, the cutter chain clutch in this instance is` operated directlyby a pivoted'lever'l I0 secured to a transversely extending horizontal shaft IH whichl carries they shipper yoke for sliding the jaw clutch member 231. It will thusbe seen that in this modified' form of construction the cutter chain drive clutch and the speed varying means for the cutter bar swing are operated from the side of the cutter frame adjacent'the forward end of theY machine instead ofithrough connections extending beneath the motor and feed framesto the opposite or feed end ofthe machine, and are especially adapted to a machine ofthe low vein type wherein the motor and feedv frames rest ,directlyy on the mine khoor. Otherwise this formof the invention is the same as that above described. f

As a result of this invention, it will benoted that an improvedcutter bar swinging mechanism is providedV whereby thecutter bar may beswung Y about its pivot through a wide range of variable cutting speeds.v It will further be noted that an improved cutter bar swinging mechanism isprovided for a'coal mining machine of` the flexibly. fed, continuous cutter, bottomV cutting type where-Y While there are in this,v application specically' described one form and a modication thereof whichy the invention mayfassume in practice, it will be understoodl that thisfformand modification of the same are shown-for purposes of illustration and that the inventionmaybe modified and embodied ingvarious other forms withouty departing from its spirit or-the scope of thefappended claims. f 1

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

1. In a mining machine, a machine frame, a cutter bar pivotally mounted thereon for cutting a plane kerf, and mechanism for swinging said cutter bar about its pivot in its cutting planes including a drive member rotatable about, an axis coincident with the bar pivot axis, a member swingable with said cutter bar, and speed reducing means between said drive member and said swingable member including an eccentric, a reciprocable member actuated by said eccentric, and a rotatable member actuated by said reciprocable member and arranged coaxial with the bar pivot.

2. In amining machine, a machine frame, a cutter bar pivotally mounted thereon and swingable on its pivot to cut a plane kerf, and means for swinging said cutter bar about its pivot including an eccentric rotatable about an axis alined with the bar pivot axis, and variable speed .driving connections between said eccentric and cutter bar including a plunger actuated by said eccentric, a lever swingable by said plunger, a drive clutch arranged with its axis in the same plane with the bar pivot, and clutch operating means actuated by said lever.

3. In a mining machine, a machine frame, a cutter bar pivotally mounted thereon and swingable on its pivot to. cut a plane kerf, and means for swinging said cutter bar about its pivot including an eccentric rotatable about an axis alined with the bar pivot axis, and variablev speed driving connections between said eccentric and cutter bar including a plunger actuated by said eccentric, a lever swingable by said plunger, a drive clutch varranged with its axis in the same plane with the Athe bar pivot, clutch operating means actuated by said lever, and means for varying the position of the lever fulcrum to vary the drive through said clutch. Y

` 4. In a mining machine, a machine frame and cutter bar pivotally mounted thereon andswingable on its pivot to cut a plane kerf, and means for swinging said .cutter bar about its pivot including an eccentric arranged with its axis alined with the bar pivot axis, and variable speed driving connections between said eccentric and the cutter bar including a plunger actuated by said eccentric, a pivoted lever, a resilient connection between said plunger and lever whereby said lever is swung about its pivot by said plunger, a drive clutch, a shipper member for said clutch, and connections between said lever and shipper member whereby said shipper member is actuated by said lever, and means for varying the positionof the lever fulcrum to vary the application of said clutch.

5. In a mining machine, a machine frame, a cutter bar pivotally mounted thereon and swingable on its pivotto Vcut a plane kerf, a drive member arranged with its axis alined with the bar pivot axis, a Speed reducing mechanism connected to the cutter bar, and intermittent, clutch controlled variable speed driving connections be- Vtween said drive member and said speed reducing mechanism and arranged generally coaxially with the' bar pivot.

6. In a mining machine, a machine frame, a cutter bar pivotally mounted thereon and swingable on its pivot to cut a plane kerf, means for swinging said cutter bar about its pivot through a wide range of variable speeds including driving means including a driving element coaxial with the bar pivot, a friction clutch, means actuated by an element of said driving means for intermittently applying and releasing said clutch, and a speed reducing mechanism driven through said clutch' and connectible by the latter to said driving element, said latter mechanism operatively connected to said cutter bar.

7. In a mining machine, a machine frame, a cutter bar pivotally mounted thereon and swingable on its pivot to cut a plane kerf, means for swinging said cutter bar about its pivot through a wide range of variable speeds including driving means including a driving element coaxial with the bar pivot, a friction clutch, means actuated by an element of said driving means for intermittently applying and releasing said clutch, and a speed reducing mechanism driven through said clutch and connectible by the latter to said driving element, said latter mechanism operatively connected to said cutter bar, said speed reducing mechanism including a continuous-wedge speed reducing device arranged in the drive between said clutch and said cutter bar.

8. In a mining machine, a machine frame, a cutter bar pivotally mounted thereon to swing relative thereto to cut a plane kerf, and means for swinging said cutter bar about its pivot including a driving element coaxial with the bar pivot and having an eccentric hub, a shaft, a friction clutch for connecting said driving element to said shaft, and means actuated by said eccentric hub for intermittently applying and releasing said clutch.

9. In a mining machine, a'machine frame, a Cutter bar pivotally mounted thereon to swing relative thereto to cut a plane kerf, and means for swinging said cutter bar about its pivot including a driving element coaxial with the bar,

friction clutch for connecting said driving element Yto said shaft, means actuated by said eccentric hub for intermittently applying and releasing said clutch, and means for varying the time intervals of such application Aand release including an operating means for said varying L,

means located at the end of the machine remote from the cutter bar pivot.

l1. In a mining machine, a machine frame, a cutter bar pivotally mounted thereon to swing relative thereto, and means for Swinging the cut- 'f ter bar about its pivot including an eccentric, a plunger actuated thereby and reciprocable along a line extending radially with respect to the bar pivot axis, a lever, and a yielding connection betweenA said plunger and said lever.

12. In a mining machine, a. machine frame, a cutter bar pivotally mounted thereon to swing relative thereto tocut a plane kerf, and means for intermittently swinging the cutter bar about its pivot including a bar swing controlling clutch coaxial with the bar pivot and means for intermittently automatically applying said clutch including an eccentric, a plunger actuated thereby, a lever, a yielding connection between said plunger and said lever including a spring encircling said plunger and engaging an 'abutment thereon, and a collar on Vsaid plunger, said lever being swung through said springand' collar.

V13. In amining machine,a^machine1frame,a cutter bar pivotally mountedthereon to Ysw-ing relative thereto to cut a plane-kerL-andmeans for intermittently swinging the cutter bar Y'about'fits pivot including a bar swing controllingclutch coaxial' withV the bar pivot and-means for intermittently automatically applying said clutchincluding an eccentric, a plunger-'actuatedthereby, a lever, and a yielding connection between-said plunger and said lever, vand va -pivoted clutch shipper actuated by said lever.

14. In av mining machine, afmach'ineframe, a cutter bar pivotally mounted thereon to-swing relative thereto to 'cut a planelrerf,l and -meansfor intermittently swinging the cutter bar about' its pivot including a bar swing controlling-'clutch coaxial with the barpivot and meansior intermittently automatically applying said 'clutch in# cluding an eccentric, a plunger actuated thereby, a lever, a yielding connection betweensaid plunger and said lever, and mea-ns` for changing the positionA ofv the 'lever' fulcrumto' lvaryL the extent of swingy of said lever.

I 15. In a mining machine, ja' trama-'afkerf'cutter pivotallymounted on saidframe for cuttingea planekerfjand motor operated means vfor swingingsaid kerf cutter in'v its/cutting planes about its pivot at a cutting speed includingairiction'clutch coaxial with the cutter pivotand motor operated mecha-nismfor intermittently5 applying andreleasing said clutch at predetermined timed intervals.

16." In a mining machinma frameyat kerf cutter pivotally mounted on saidframe-forcuttingfa planekerf, and lmotor operatedmeans-"for intermittently swingingsaid -kerf cutter in'- its cutting planes/abouti itspivot through--varwide vrange-Ici cutting :speeds including.' al friction clutch coaxial with. the cutter-pivot,- motor operated mechanism for intermittently 2 applying @and .'releasing; said clutch .at predetermined '.timedintervals, `.and means operable at -wil1` for 1 varying saidtimed intervalsl to vary the rate of `cutter.` swing.

17,. ,In a mining machinesa frame, a keri, cutter pivotally mounted onsaid frame and swinga'bleion =its-1pivot to out 'fa plane yKeri, and :motor 'seperated means Vfor swingingl said :xkerf cutterf about' its Ipivot -including an eccentric member-rotatable about .an axis coincident -with'vthe cutterlpivot axis, a cutter swinging elementv coaxial- Vwith said eccentric,y member kand Yoperatively connected to saidkerf cutter, a clutch coaxial with saideccentric member, and means actuated -by saidfeccentric #member vfor intermittently applying `and releasing said clutch .at timed-intervals.

18. In a mining machine, a frame, alterfv cutter pivotallymountednn said. framev .and swingable on .its pivot to cut a plane*keri,and.motoroperated means for swinging saidkerf` cutter about its pivot including an eccentric member rotatablesabout `an axis-'coincident with the cutter pivot..axis,a cutter swinging element coaxial with saideccentric member and operatively connectedto said kerf cutter, aV clutch coaxial with said eccentric member,`means actuated'bysaid eccentric member for'intermittently applying and'relea'sing said clutch at timed intervals,` andmeans for varying Y ytheduration of Vsaid timed intervals. to vary. the rate'ofcutter swing. j

v19.t In a'mining machine,V a framea'kerf'cutter pivotally mounted onsaid( frame 'and swingable on its pivot to cutaplane kerf, and motor operated means for swinging said kerf cutter about'its pivot including an eccentric member rotatable about an axis coincident with the cutter-pivot axis, a 'cutter swinging element coaxial with said eccentric member and operatively connected to saidkerf cutter, a clutch coaxial With'said eccentric `membena plunger actuated by said eccentric member, and means actuated by said plunger for intermittently applying and releasingsaid 'clutch at timed intervals.

20. In a mining machine, `a frame, a kerf cutter pivotally ymounted on said frame and swingable on its .pivot tor cut a plane kerf, and motor operated means for `swinging said kerf cutter about its pivot including an eccentric member rotatable about an axis coincident with the cutter pivot axis, ay cutter-swinging element coaxial with-said eccentric` member and operatively connected to saidkerf cutter, a clutch coaxial with said eccentric member, a plunger actuated by saide'ccentric, and yieldable meansactuated by said plunger for intermittentlyV applying and releasing said clutch at-Ytimed intervals.

VA.21. Ina mining machine, a frame, a kerf cutter pivotally mounted on said frame and swingable on its pivot to cut a plane kerf, and motor operated means for swinging said kerf cutter about its pivot including an eccentric member rotatable about van axis coincident with the cutterpivot axis,'a cutter swinging element 'coaxial with said eccentric member and operatively ccnnected'to said kerf cutter, a clutch coaxial with said eccentric member,-a plunger actuated by said eccentric, and means including a lever Vactuated by; said plunger for intermittently applying-and releasing said clutch at timed intervals.

122. Inra ymining machine, va frame, la kerfcutter pivotally mounted on said frame Aand swingable onv its pivot to cut av plane kerf, vand motor operated means for swinging said f kerf cutter about its pivot including aneccentric member rotatable about an axis coincident with the cutter pivot-axis, a cutter swinging element'coaxial with said 'eccentricmember vand 4operatively connected to said'kerf cutter, a clutch coaxial with 4said eccentricmember; a plunger -actuatedlby said eccentric,'yieldable means actuated by said plunger, and a lever actuatedY bysaid plunger through said yieldable means for intermittently applying and releasing said clutch at timed intervals.

v'-23.`In a mining machine, a frame, a` kerf cutter pivotally mounted onsaid frame Vand swingable onv its pivot to cut a plane kerf, and motor operated v:means for swinging said kerf cutter about its pivot including a driving memberrotatable about an axiscoincident lwith thecutter pivot axis, an eccentricmember coaxial with said 'driving member, connections between said driving' member and said eccentric member for l intermittently rotating saideccentricmember at predetermined timed intervals, a plunger' actuatedby said eccentric member and guidedon said frame, and av member actuated by saidplunger and secured to said kerf cutter.

2i.` In a-mining machine, a frame,'a kerfcutter pivotally mounted on said frame and swing- Vable en its pivot to cuta plane kerf, andV motor operated means for swinging said `kerf cutter about itsr pivot including a"driving memberarranged with its axisv coincident withthecutter pivot axis, an eccentric member coaxial with said drivingmember, connections between said driving member and'eccentricjmember for"intermit tentlyrotating the latterincluding ai clutchanjd means'A for intermittently' applying'V and releasing said clutch at timed intervals, a plunger actuated by said eccentric member and guided on said frame, and a member actuated by said plunger and secured to the lierf cutter.

25. kIn a mining machine, a frame, a kerf cutterv pivotally mounted on said frame to cut a plane keri, and motor operated means for swinging said kerf cutter about its pivot in its cutting planes through a wide range of cutting speeds including coaxial relatively rotatable driving and driven elements arranged with their axes coincident with the cutter pivot axis, and driving connections between said elements and arranged generally coaxially therewith for intermittently rotating said driven element through a wide range of speeds.

26. In a mining machine, a frame, a kerf cutterpivotally mounted on said frame to cut a plane keri, and motor operated means for swinging said kerf cutter about its pivot in its cutting planes through a wide range of cutting speeds including coaxial relatively rotatable driving and driven elements arranged with their axes coincident with the cutter pivot axis, drivingconnections between said elements for intermittently rotating said driven element through a wide range oi speeds including a clutch, means driven by an element of the driving means for intermittently applying and releasing said clutch at predetermined timed intervals, and means operable at will for varying the duration of said timed intervals.

f 27. In a mining machine, a frame, a kerf cutter pivotally mounted on said frame to cut a plane kerf, and motor operated means for swinging said kerf cutter about its pivot in its cutting planes through a wide range of cutting speeds including a driving member arranged with its axiscoincident with the cutter pivot axis, a driven member coaxial with said driving member and secured to said kerf cutter, connections between said driving and driven members 4for intermittently rotating said driven member including a friction clutch, means actuated by an element of said driving means for intermittently applying and releasing said clutch at predetermined timed intervals, and means operable at will for varying the duration of said timed intervals.

28. vIn a mining machine, a frame, a ker cutter pivotally mounted on said frame and swingable on its pivot to cut a plane kerf, motor operated means for swinging said kerf cutter about its pivot including an eccentric member rotatable about an axis coincident with the cutter pivot axis, an annular member rotatably mounted on and actuated by said eccentric member, a member having a portion surrounding said annular member and secured to said frame, said last mentioned member having radially located guideways', plungers guided in said guideways and actuated by said eccentric member through said annular member, a toothed member with which said plungers cooperate and secured to the kerf cutter, means for intermittently rotating sai-d eccentric member through a wide range of speeds including a driving element coaxial with said eccentric member, a clutch for connecting said eccentric member in driving relation with said driving element, and means actuated by an element of the driving means for intermittently applying and releasing said clutch at timed intervals.

29. In a mining machine, a frame, a kerf cutter pivotally mounted on said frame andrswingable on its pivot to cut a plane kerf, motor operated means for swinging said kerf cutter about its pivot including an eccentric member rotatable about an axis coincident with the cutter pivot axis, an annular member rotatably mounted on and actuated by said eccentric member, a member having a portion surrounding said annularA member and secured to said frame, said last mentioned member having radially located guideways, plungers guided in said guideways and actuated by said eccentric member through said annular member, a toothed member with which said plungers cooperate and secured to the kerf cutter, means for intermittently rotating said eccentric member through a wide range of speeds including a driving element coaxial with said eccentric member, a clutch for connecting said eccentric member in driving relation with said driving element, means actuated by an element of the driving means for intermittently applying and releasing said clutch at timed intervals, and means operable at will for varying the duration of said timed intervals to vary the rate of intermittent eccentric member rotation.

30. Ina mining machine, a frame, a cutter bar pivotally mounted thereon and swingable on its pivot to cut a plane kerf, and motor operated means for swinging said cutter bar about its pivot including a driving member, an eccentric driven thereby, a shaft coaxial with the bar pivot, a clutch for connecting said shaft to said driving member and through which all power is transmitted to effect low speed bar swing, and means actuated by said eccentric for intermittently applying and releasing said clutch at timed intervals.

31. In a mining machine, a machine frame, a cutter bar pivotally mounted thereon and swingable on its pivot to cut a plane kerf, and means for swinging said cutter bar about its pivot including a driving member rotatable about an axis alined with the barV pivot axis, and variable speed driving connections between said driving member and cutter bar for transmitting a swinging force from the former to the latter including a plunger actuated by said driving member, a lever swingable by said plunger, a drive clutch, and clutch operated means actuated by said lever. I

32. In a mining machine, a machine frame, a cutter bar pivotally mounted thereon and swingable on its pivot to cut a plane kerf, and means for swinging said cutter bar about its pivot including an eccentric rotatable about an axis alined with the bar pivot axis, and variable speed driving connections between said eccentric and cutter bar including a plunger actuated by said eccentric, a lever swingable by said plunger, a drive clutch coaxial with the barrpivot, clutch operating means actuated by said lever, and means for varying the position of the lever fulcrum to vary the drive through said clutch.

l 33. In a mining machine, a machine frame and cutter bar pivotally mounted thereon and swingable on its pivot to cut a plane kerf, and means forswinging saidV cutter bar about its pivot including an eccentric arranged with its axis alined with the bar pivot axis, and variable speed driving connections between said eccentric and the cutter bar including a plunger actuated bysaid eccentric, a pivoted lever, a resilient connection between said plunger and lever whereby said lever is swung about its pivot by said plunger, a drive clutch coaxial with the bar pivot, a shipper member for said clutch, connections between said lever and shipper member whereby said shipper member is actuated by said lever, and means for varying the position of the lever fulcru'm to vary the application of said clutch.

34. In a mining machine, a machine frame, Va cutter bar pivotally mounted thereon to swing relative thereto to cut a plane kerf, means for swinging the cutter bar about its pivot including a drive member coaxial with the bar pivot, an eccentric driven thereby, a plunger actuated by said Y eccentric, a lever, and a yielding connection between said plunger and said lever through which the latter is actuated by said plunger. Y

35. In a mining machine, a machine frame, a cutter bar pivotally mounted thereon to swing relative thereto to cut a plane kerf, means for swinging the cutter bar about its pivot including a drive member coaxial with the bar pivot, an eccentric driven thereby, a plunger actuated by said eccentric, a lever, a yielding connection between said plunger and said lever through which the latter is actuated by said plunger includingV a spring encircling said plunger and engaging an abutment thereon', and a collar on said plunger, said lever being swung through said spring and collar.

36. In a mining machine, a machine frame, a

cutter bar pivotally mounted thereon toswing relative'thereto to out a plane kerf, means for swinging the cutter bar about its pivot including a drive member coaxial with the bar pivot, an eccentric driven thereby, a plunger actuated by said f eccentric, a lever, a yielding connection between said plunger and said lever through which the latter is actuated by said plunger, and a pivoted clutch shipper actuated by said lever.

37. In a mining machine, a machine frame, a cutter bar pivotally mounted thereon to swing relative thereto to cut a plane kerf, means for swinging the cutter bar about its pivot including a drive member coaxial with the bar pivot, an eccentric driven thereby, a plunger actuated by said eccentric, a lever, a yielding connection between said plunger and said lever through which the latter is actuated by said plunger, and means VlO for changing the position of the lever fulcrum 20 to vary the extent of swing of said lever.

MORRIS P. HOLMES.

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