US2327928A - Mining apparatus - Google Patents

Description

Aug. 24, 1943. c. F. osGoop 2,327,928

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AMM'. lai' @mv A my Patented Aug. 24, 1943 j .y

' Sullivanzlvlaclinery Company;Y afcorporationo Massachusetts continuation of." application fstiiialfNo. 140.681,

SelfilNo. 33620531 lisation iviayV 18;'1940; j V

stomme.- (01.26.2525)'.- t V This invention 'relates to miningappara'tus. and more particularly vto improvements in' coal mining -apparatus yoft-the combined horizontal and' shear cutter, track supported and guided type.

An object off this. present. invention is to' provide an improved coal mining apparatus having an improved adjustable supporting structure for. the kerf cuttingr-mechanism. Anotherobje'ct Ais to provideY an improved adjustable supporting l tionbetween theimine' roof and mine loo-r and) vertical kerfs may be cut at' any desiredlocation in the coal face between thegri'bs. Another object is to providean"improvedjadjustable supi-g porting structure for the kerf cutter whereby horizontal and vertical kerfs' may be cut in either rib at either side of the coa'l face. vA still further object is to` provide Aan improved parallel motion supporting. structure for the lrerf cutter' apparatus#shown` iriffl'i'g'.` 15,. differeirtzposition's or the kerffciittet being. indicat'eer indotte@ lines.- f 'f takenusubstantially on" line` E-6. of Fig. 15,

tioniinaaf mine,with thelkerf cutter adjustedinto whereby a series of parallel horizontal ker'fs may be cut in the coalface at ajny desired*locationA between a position near the level of the minei oor anda position alsvubstaintial distance above the mine floor, and having embodied thereiniim# proved means for' tilting the kerf cutter relative to thehorizontal to change itsfanglewithf respect' to the horizontal. Yet another object is to provide an improved adjustable kerfl cutter support-` ing structure'of` the hydi'azujlically operated type whereby' the kerf` cutter maybe readily and? quickly adjusted into `the desired cutting position and locked' such position. still "further object of this invention i'stol providean-improved coal mining apparatus of the above* character, having novel arrangementsand combi-natonsef* parts; These and other' objects and' advantages of. the invention will, however, `hereinafter more fullyapp'ear.. j f .l y

This application is' a contihuationnof my applicaton Serial N02A 140',68I1fr1ed'1\f/I"ay 4, 1.93"?? In the;accompanyine'drawings there are shown? for purposes ofillustration two forms which the invention may assume inpra'ctice;

In these drawings..

Fig, 1 isza' plariview of acoalfminingapparae' I tus. incorporatiiogv the preferred illustrative ofthe invention.. 4 V Fig. 2"i`s a side elevational' view'ci the mining Figi 'l' issie. diagrammatic Viewy illustrating`fthe` hydraulictlluidv system and= the l associated controli rneansty 8. is' afdiagrammatisi-cle ViewY showing the.

improved: mining; apparatus in. operative. posi-` a-toprcutting positioni.- 'E'ig..19is a` diagrammatic side view. showing theY` mining.amaaratusr ina mine, with thekerfcutter. adj-usted` into abottoneutting position.

Fig-1Q is.- aidiagrammaticplan. view showing 'theminingflapparatusin amine, with lieril cutter adj-.ustedintoa position for center shearings the ribyshearing position of/ thekerf cutter beingvindicatedtin,dotted lines. I i M i v Fig.. lL a dagrammaticview similar toljigl S,i showing the kerf ycut-ter adjusted into la hori- Zon-tal cutting position. ya', substantial distance above theimineoor.- l liig1 is aplan View ofthe forwardj pprtion of a coalv miningapparatus, in which is incorporated amodiedlfbrin ofthe invention. u V Eig. 13?. ist aside elevational View of the min"- ing. apparatus shown in Fig. 12, different positions-.of the kerf cutter being indicated `i-n dotted' lines.. j

t Fig; IiA isajn' enlarged view in longitudinal verti, vl1sectionjtalsen.substantially on `line ttf-'M Fig. reis a diagrammaticviewiiuustratmg the hydraulicfluit system andi tn'e''associated controlthe mining apparatus in a mine, with the kerf cutter adjusted into a top cutting position.

In both embodiments of the invention there is disclosed a coal mining apparatus of the combined horizontal and shear cutter, track supportedand guided type, commonly known Ias a universaliy track cutter, although it will be.evi dent'that various features of the invention may be incorporated in coal mining apparatus of various other types. the invention the improved adjustable supporting structure for the kerfv cutter is shown mounted on a self-propelled base, which may be ofthe same general type as that disclosed in a copending application of one Joseph F. Joy, Serial No.

20,826, filed May 10, 1935, nowv matured'into, Patent No. 2,229,087, patented January 21, 19451,*al-H though the self-propelled base may assume various other forms such as a slidably supported,

flexibly fed base, or a tractor mounted ba'se.

L In the preferred illustrative embodiment of the ,invention disclosed in Figs.-1 to 1,1; inclusive, the

self-propelled baseis generally designatedv I, and 2 generally designates the 'improvedl adjustable supporting structure for a kerf cutter 3. 'I'l'lel base I comprises ya truck frame `4, of -a low comed-to travel along amine trackwayi Supported on a horizontal portion 1 `of'the'truck.trarne pro,- jecting forwardly in advance of thefront truck wheels 'is` a horizontal turntable 8 arranged in a relatively low position on the base with its-vertical axis of rotation disposed a substantial distance in advance of the front truck wheels. In certain forms of the invention thc-:turntable 8 may, obviously, be mounted on the base directly above thetruck wheelr axles, although with such an arrangement, the cutting range Iof thecutting apparatus is necessarily decreased, unless the supporting structure is more elongated to provide greater' over-hang with respect 'to the base. Mounted on the turntable 8 is an'elongated arm or boom structure 9 of the adjustable supporting structure 2 and on the outer extremity of this boom structure the kerf cutter @lisv supported.

The horizontal forwardly projecting frame` portion 'I of the truck frame is of generally annular formand supports bearing sleeves IIJ in which a circular depending portion II of the open-center turntable frame I2 is journaled, the turntable frame maintained in position onV its bearings by a retaining ring I3 bolted to the bottom of the turntable frame. The means for rotating the turntable comprises a reversible hydraulic motor I4, of a conventional design, having its power shaft connected to ay transverse worm shaft i6 suitably journaled onthe truck frame. Fixed to the shaft I6 is a worm I1 meshing with a worm gear rack lfformedon ankarcuate ange Si integral with the turntable frame. rlihe forward side of the.vfialnge wis-preferably cut away to permit. movement of the arm Structureidown into the cutaway portion.` vThe' teeth of the worrnand worm gear rackare of the selflocking type and lock automatically the turntable in itsV adjusted position with respecttothe base. '1" p 'Now referring-:to the varm or boom structure 9 ofthe adjustable'supp'orting structure 2, itrwill be noted that pivotally mountedatgkZdon.the turntable, on alined horizontal axes` extending transversely'of theturntable, is apair 0i'` parallel supporting links or. arms 2l, `ZI, while pivotally mounted onine-'turntable at the rear Qfpthe Also in both embodiments of"- 1.0i

arms 2I on alined pivotal axes at V22, parallel with arms 23. arms 23 are prererably arranged near the rearward edge of the turntable in the manner shown in Fig. 3. The front and rear pairs of arms 2l and 23 are pivotally conn'ected'at their outer" ends at 24 and `25, respectively, to, andsupport, an elongated arm or boom portion 26; and these pairs of arms, when in parallel. relation, coopl erate to K, provide a parallel motion supporting structure for the boom portion 25, so that when the arms are swung about their inner pivotal .i and'each comprises a hydraulic cylinder 21 conpact design, supportedon truck wheels 5 adapttaining a reciprocable piston 28 having its piston rod 29 projecting upwardly through the packed upper head of the cylinder. It is accordingly evident that when hydraulic pressure is supplied to the cylinders 2l' and the pistons '.23 aremoved v relative to the cylinders, the pairs ofy front, andrv rear arms are moved out of parallelism, and as'.

a result, the boom portion 26 is tilt'ed'about its" pivotalA connection `with the front parallel arms, in vertical planes either upwardlyordownwardly with respect to the horizontal; Whenhydraulic pressure is trapped within the opposite ends of the cylinders, the parts may be locked. in their adjusted position. Hydraulically opei-, ated means is provided for swinging the pairs, of arms 2| and 23 about their 'pivotal' axes rela.'-

tve to the turntable, comprising a pairfof hydraulic lifting cylindersI 30,39disposed`at the opposite sides .of the boom 2t and mounted. to, swing in Verticalplanes, andeach cylindercontaining, as shown in Fig. 3, a reciprocable lpiston v 3| having its piston rod 32 projecting `outwardly through the packedV outer head oi the cylinder;

and the piston rods are pivotally. connected atl 33 to the boom 2S on alined axes coincident zwith the outer pivotal axesl vof the boom connection with the front pair of arms The lower ends of the cylinders 30 are pivotally connected ,at .3ft

to a bracket 35 formed integralgwith th.e 'tin"n-v table `frame and extending outwardly about the annularportion of the truck frame` interconnec-y tron with the top and bottom -portion's'lof the;

turntable frame, as shown in Fig; `3. When liy'k-y draulio pressure is suppliedj to vthe lifting fcyl-., inders 30, the pistons SI- may be moved-toeiect inders 30 may, if desired, beef thewell-known y double telescopic type to provide a widerrange of adjustment wlllile'retainingv cornpactnessy The kerf cutter supportingarm or boom portion 25 comprises a rear motor lfra'n'rietli, while supported by the front head 36 ofthe motor frame is an outwardly projectingfrarne 31 ,have4 ing a cylindric frame portion supporting a bearing sleeve 38 on which a cutter head ,39,`i s" ro'-, tatably mounted. The cutter head is v,rotatable about an axis coincident with the longitudinal axis of the boom and the motor axis. Secured to the outer part of the rotatable cutter head is a yoke-shaped frame 40 on which ispivotally mounted at 4I, on an axis at right` angles tothe nected by a conduit L9i) vback to the'tank. The valve box contains a series of manuallyoperable rotary control valves 9|, 92,93, '94 and 95 each having a controlling handle. #The valve 9| controls the flow of hydraulic pressure to'and the discharge of fluid from the cutter support tilting cylinder 14 through conduits 96'and 91, while the valve 92 controls the flow of hydraulic pressure to and from the head rotating motor 66 through conduits 98 and 99. The valve 93 conr-` trols the supply of hydraulic pressure to and from the opposite ends of the'lifting cylinders 30 through conduits |00, |91, while the valve 94 controls the supply of hydraulic pressure to and from the rear arm cylinders 21 through conduits |02 and |03. The valve 95 controls the supply of hydraulic pressure and the discharge of fluid from the turntable,rotating'motor |11 through conduits IM and4 |95. It willthus be seen that the various' hydraulically operated devices may be operated in either of opposite directions under the individual controllof the valves,v so that the parts adjusted thereby may be moved f in either of opposite directions and locked'in such adjusted position b-y trapping the hydraulic pres sure within the hydraulic motors.

The general mode of operation of the form of the invention above described is as follows: The apparatus may be propelled along the mine trackway from one working place to another-and during'the cutting operation, through the' base propelling mechanisml driven by the motor 85, in

the manner clearly described in the above mentioned Joy application. When the working place is reached and it is desired to cut a horizontal kerf at the floor level in' accordance with the arc- Wall method of cutting, the turntable 8 and boom 9 may be adjusted relative tothe base to locate thekerf cutter at one side of the trackway at the level of the mine floor withits tip end at the coal face near the right hand rib. `The motor may then be operated to effect circulation of the cutter chain about the ma'rgin of the Cutter bar, and upon propulsion of the apparatus bodily forwardly along the minetrackway, the kerf cutteris surnped'beneaththel coal to the position shown in Fig. 9. Upon completion of the sump',- ing cut, the truck wheels are braked, in a known manner, to hold the base stationary with respect to the trackway, and the turntable rotating motor I4 is operated to rotate the turntable 8, thereby to effect swinging of the kerfcutterhorizontally in its planes about the turntable axis to eiect its transverse cutting operation. When the tip end of the kerf cutter assumes a position adjacent the left hand rib and the swinging eut is completed, the truck wheel brake is released and the apparatus is propelled bodily rearwardly along the mine trackway to eflect withdrawal of the kerf cutter beneath the coal. When it is desired to insert a horizontal kerf in the coal face at the roofl level, the rear arm cylinders 21 and the lifting cylinders 30 are operated to swing the boom in a Vertical direction about its pivotal connection with the pair of outer arms 2|, and the cutter head 39 is rotated about its axis relative to the boom to adjust the kerf cutter from the bottom cutting position shown in Fig. 9 to the topl cutting position shown in Fig. 8. When the kerf cutter assumes its top cutting position, as shown in Fig. 8, the apparatus may be operated to 'effect sumping, swinging, and withdrawal movements of the cutter bar in accordance with the arcwall method of cutting, in a manner identical to that above described in connection with the kerf cutter may be adjusted from its top cutting position Vabove the head axis, as shown in' Fig. 11, to a horizontal cutting position below the head axis. In any of the horizontal cutting positions above described, the kerf cutter may be tiltedinto angularly related planes with respect to thehorizontal by operating the 'cutter'support swinging 14 to swing the cutter support 42 either upwardly or downwardly about its pivot relative tothe cutter head 39 and boom. Furthermore, during any of the horizontal cutting operations above described, the kerf cutter may be rocked with .the cutter head about the head axis relative to the boom to enable the cutter bar to follow an uneven or rolling bottom or pitching'coal seam. When it is desired tov insert a vertical shear cut in the coal face, as shown in Fig; ,10, the cutter head 39 may be rotated to adjust the kerf cutter into a vertical cutting position with respect to the boom. The kerf cutter may then be swung upwardly by the rear arm cylinders 21 and the lifting cylinders 30, until its tip end assumes a position at the roof level. 'I'he apparatus may then be propelled bodily'forwardly l along the mine trackway to sump the kerf cutter into the coal. The truck wheels of the base may.

then be braked to hold the base stationary with respect to the trackway, and the rear arm and lifting cylinders 21 and 3|) may then be operated to swing the boom in a vertical direction relative" to the turntable to move the kerf cutter in vertical planes in an arcuate path to effect a ver-` tical swinging cut. When the tip end of the kerf cutter assumes a position at the floor level, the

truck wheel brake may be released and the apparatus propelled bodily rearwardly along the trackway to effect withdrawal of the kerf cutter from the coal. By adjusting the turntable, boom,- cutter head and cutter support about their respective pivotal axes, the kerf cutter may bev adjusted into positions to cut horizontal and vertil cal kerfs in either rib at either side of the coal face in an obvious. manner. In any of the cutting operations vabove described, the angular relation of the kerfA cutter With respect to the boom-may be changed simply by releasing the locking bar 49, swinging the kerf cutter about its pivot, and then relooking the cutter.

.'ln the modified form of the invention disclosed in Figs. 12 to 19, inclusive, the portable base. turnable, rotatable cutter head, tiltable cutter support and lrerfv cutter are similar to those above described; the'invention, in this instance, residing primarily in the particular boom structure intervening the turntable and cutter head. The improved boom structure comprises a rear'boom portion |03 and a forward boom portion |01, the latter being pivotallyrnoun'ted on and supported by the rear boom portion, The rear boomportion |03 ispivotally mountedat |08 on a horizontal axis extending transversely of the turntable near the rearward edge 'ofthe latter, and the front boom portion |01 is pivotallymountedat |09 on the outer t extremity of ithe rear E-looeni portion on an `axis parallel with-the-pivotal axis W8. "The Ameans ffor swinging -the "boom lin aa vertical #direction about its `pivot `relative :tof the turntable come prises a pair of lhydraulic 'lifting Acylinders v'lilll, I l0 arranged at theJopposite sidesof -`theboom and pivotally mounted at fill at their lower vends on the turntable :ir-ame on Jalin'ed -axes parallel with the boom 'pi-Votiaxis.` 1|These Acylinders contain freoiprocable Ipistons fl'lZ-f'having their piston rods H41! lproecting forwardly and upwardly :through the packed Avupper fl'ieatlsA dof the cylinders andpivotally conneetediatitlll to the lforwardportionlof the '--rearboom Apor-tien IBS. For swinging the-outer 'boomportion P51 in a Vertical direction-about itspivot'relativefto the. rear boom portion, Y there is 'provided fapair .of i hydraulic cylinders il F5 arranged ratV opposite sides of the boom and pivotally:mountedfatf-their inner ends on A:aline'daiies tcoincident with the pivotalaxis 1 |268 fo'fitheboom. -The:cylinliers iii-f5 contain reciprocable pistons M6 ihaving their piston .-ro'ds :H1-projecting Sforwar'dly through thepacked outer lieadsfof thel cylindersendipivotally connected .at it 'to .projecting varinlilie lugs .MLS secured to 1 the front' boom i portion 'MVL It -wili thus be Lseen that 'by operating `the hy.- draul-ic .cylinders l' i til s and I l5, :the boom imay-'be swung about its :pivot U33 :and .the `outer iboom .portion may ibe swung into idifierent iangulafrly related positions aboutits Jpivot irelatiue Lto the rear :boom ,portion. 'Arranged =within 4 .the :rear boom iportion is a ;rnotor H120 having its Epen/.er shaft i2! l.alined ,with fthefllongitudinal :.aoisfof thercarboorn portion,;and fkeyerlstotthe-:imotor power shaft isiabevelsgear :I2-2 meshing'uwitm-a bevel, gear I2 3 jrkeyed to @a horizontal sl'iaft i i224 coaxial fwith the pivotal. axissof th'e.;frorit ,ib-oom portion. `Meshing 'with andfidrifven iloythe bevel gear y'|23 is .a-bevel gea-r -.l2;5c:keye.dt.o a shaft @L25 arranged .with `its Vaxis :of rotation icoincitlent with the 4longitudinal axis of the :front rboom portion and `suitably :journaled on 'thealatter.

Keyed Vto .the forward .endl-,of and fdriven by tithe shaft i253 ais the #bevel gear 151 which' effects `drive ,of the .cutter'chainfiintnemanner fully described above..` If desired lifting cylinders i t liu may be ipivota'lly ymounted aon .the sturntable frame, vin the imannerfshown: invFigmS, :with the upper ends of .the-piston :rodsfpivotally .oonneoted f to fthe .'boom on zalinedf-axes coaxial withrthe pivot between theffront andfrear :boom sporticns., and the cylinders may also :bcxof theadauble telescopic typefto `obtainfa :longfrange :oflzardilstment 1while retaining compactness. fA1so,in;this `forml of the invention, the cylindersdtymayfbo pivotally Vmounted l at their rear ends .3cm :falined axes parallel iwith-,thepivot .axis i|i08,finsto&i Bof infgthe coaxial relation, disclosed. Thesmeansffor supplying :hydraulic pressure to the hydraulic cylinders ,fwill later --be described.

It will thus'bgeseen -t-hat when vthe=:l:e1'f.;c1: it 4ter, ;is in :horizontal cutting position :..wth the Acutter .support :pivotiaxis 14| 1 inJ parallelism :with thefboom pivot/axis il.l8,:.the lifting cylindeitsil'iz may fbe `operated toiswingr the hoomz'in :awvertical direction .relative lto .the turntable 118, and 'the cutter .supportltilting cylinder 1.4foperazted 'tofftilt the cutter support 1142 relative `ftoztheboonr ito move the kerf cutter through a series-of-parf allel' horizontal cutting vplanes betweenfthe mine roof #and 'mine floor, lthe cutter bar bei-ngadjustable` from its top -cuttingg position, shown-'in Fig, '13,?to its bottom'euttin'g :rpositionlby rotatirigthecutter-l heady to movethe cutteriban from 'above the ifhead vaxis `to a position belowfthe head axis. Further, by operatingltlief-cylinders l I l5 to eftect `swingineoi the outerlooorn {por-tion r'elative to fthe i inner'boom mortion, f' the cutting nrange of the A lincreased. also 4Joy "rotating these-utterhea witheseifi' cutter may be aizijuste'd 'into die ttng 4. positions `aboutthe heaclraxis relative theboozn. When thezkerfscuttelris inwentioal cuttinglposition, the fcyl-inlders :ilil and :it :mayvbeifoperatedzzto swing the ihoomiabont fits :pivot flaw .and swing Lthe louter Lboorn :portion about its pivot `relative :to the ...inner :boom 1p ortion ;.to more athe lieri cutter in yertioalzpianesand iwhenitherkerf, cutterzisfin .horizontal nuttin-g :position and :the `.turntable lnotating :met Gutter may zloe swung -iiorirontally :in either :diroction roiatiue-totheihase.

ifNoW;reierriogitoztheihydxaulic flui'xi'system and its -.associatediontrolmeaiis,i it will :be fooser-ved that the. num-p FSB., 'tank 81., .conduit-s 1.8.:8 and '3.0. .thefsval-ve'loox SEQandsthefoontrolyalvesrli StLf, :94 andi ,aref-thesamegaathosegaoove;describen. In .this ansi-lanes, fiiowovel, :the "Molto-said and :'93 control :the :supply-fof. :hydra lic pressure 1 to yand fromqthe Qopositoioads of ftheoyimeets -filufarid fl'lffirlstoadiofzto tiiezoylindersflfl 2113.11.30, asfn .thozol'mff therinveationfabove-described, @the .swise :thefhydraulio rtluidfzsystem'is-thexsame @as thatv disclosed ,in ffl'ig. -7 gano therefore ,fa ,repetitionof @thedoscriptiongthereof yfis consisietedimnecessary. .Moreoven the ggeneral. inode. of 1, operation-of; the minngnapparatus; of g this, forrn of( the invention is fsiiriilar.` to ,that described abo-'te i, in regard to A.the otherform ,oflthe Qinuenton, rand therefore' a 'further description of the mode :of `operation of .this form ,of the apparatus is mot .necessaryhereinl y l t ,As .a .result of ,thiskinveilftion .it twill, A.Joe noted thatanimproreri-.ooai '.miiiing apparatus. is i oro- 'videdjhaving aniirxploveiladiufstble.supporting structure for the klerf cutter .,Whcr'eby .the .latter may he. atljils'tdthroug'h,.arlwidedigoof uniting positions. :it will.frontier benoten thai-py the .provision of 'theiimproved..adiustalolesunnortiag "stmotlurje fo`r`..thfeil.i.orf ."cuttenan iiiproyeldjmining .apparatus of the coiribmoi horizontal and shear.icutterlwneis provided whereby; horizontal keiisginay. be .ciitjin 'theoal "face atany desired -location inet-'weon the mins roof landmine 'ioor, ,arid vertieai .rens may be out in Y.the .cosi race at'` any desired .location ,between .the ribs, and horizontal E-andmerticalt Kerfs maytbaut ingeth- V er rib. ,It v`will 5 still ,further ,be evident; that by A.the `ivprovision yofy 4rthe :improved .adjustable snp- .porting .structlnie or the ,loert mutter, ,an fimprvedv-ool-:mne ,aparatos sioroviiiediwh'eh :is extremeiy -Llexibleis .no1-ationit be-ing possible notion-ly: tofiadiustthekorfaoottsrriiitoihorfizontal and fvertioal V cuttins vnosit-oos @but :also .to groll rthe rkerf cutter -gabout longitudinal and transverse. .angesfto'fenalole :the Aloert eiltteiwto toli ,flowfanyunoven .or `1Lio1i1iniggelocittoinTorv a pitching AILo acoal seam. @there-use ,andfadvantages got the Virroi'oveli'focal:ruiningiaionaratus iwill :be eclsarly :anpanentztozthose o 'f ed intherart..

Mfrlezthere i,aregini this application; specificalyidescribed;.tworformsawhichntheginveritiommay assume nin' practice, .fit @will abe ounderstootd-:rthat '.thesetforms tot; the sanileaaiie ishoiwnl fonpurpfoses ofi-illustration iarfdizlbhat fthe :inventioncmay` i be further .imodinedfiandaemhodiedf ini various Mother forms without A depa'itir-ig 1 from-f its spirit tor the scope/ofL the impendodfelai-rris.A i

.iis nperateaithe boomandilseri What .I claim as new and desireto secure by Letters Patent is: ,v r

1. In a mining apparatus,` in combination, a portable base, a turntable rotatable upon said base upon an upright axis and having an `opening in the top thereof, a kerf cutter, and means for adjusting said kkerf cutter through a wide range of horizontal cutting positions including an elongated boom structure, said kerf. cutter being pivotally supported on the forward end of said boom structure, and. means for supporting said boom structureV on said turntable for bodily adjustment upwardly and downwardly between substantially parallel, Ydifferently elevated positions and for selectively eiecting such adjustments and also at will rearward inclina` tion of said boom structure in its differently lelevated positions, said supporting means including link devices pivotally mounted on said turntable respectively at a point adjacent the back of the latter and at a point forward of the rear- -ward edge of saidv opening, and connectedat their opposite ends to said boom structure at pointsl which are both in advance of said second-mentioned point when said, boom structure is in lowered horizontal position, the rearward end 'of said boom structure when said boomy `structure is horizontal and in lowered position being forward of said first-mentioned point and to the rear'of said -ksecond-menti-oned point whereby upon rearward inclination of said boom structure at various elevations thereof the rearward end of said boom structure is positionable `within the opening in the turntable, certain of said link devices having means for varying their eifective lengths.

2. In a mining apparatus, in4 combination, a portable base, a hollow-center turntable on said base, kerf cutting mechanism, and means for adjusting said kerf cutting mechanism through a wide rangeof horizontal cutting positions in'- Acluding an elongated support arranged with its central longitudinal vertical plane at least .substantially bisecting said turntable, the inner fend of said support overlying the hollow center of said turntable, said kerf cutting mechanism including a kerf cutter pivotally supported on the outer end of said support, and means for support.- ying said elongated support upon'said turntable 3. In a mining apparatus, in combination, a

portable base, a turntable rotatable upon said base upon an upright axis and having an opening in the top thereof, a kerf cutter, and means for adjusting'said kerf cutter through .a wide range of horizontal cutting positions including an elongated boom structure, said kerf cutter being pivotally supported at the forward end of said boom structure, and means for supporting 'said boom structure upon said turntable for bodi- ,ily adjustment up and down between substantially horizontal positions vrespectively closely` ad- J `and for selectively adjusting it bodily into 'diiferjacentto the top of said rturntable and spaced a substantial distance aboveA it and-also for tilting o f said boom structure when Vthe same isY in differently elevated positions to bring the rearward end thereofinto ythe opening in the top of the turntable while said kerf cutter is further elel the effective length thereof.v

'4. In a mining apparatus, a portable base, a hollow-center turntable on said base, kerf cutting mechanism, and means for adjusting said kerf cuttingmechanism through a wide range of horizontal cutting positions including a support overlying saidturntable and projecting forwardly from said turntable, and also rearwardly t over the centerv of'said turntable, said cutting mechanism including a kerf cutter pivotally supported on the forwardly projecting end of said support, and means for supporting said support in different. positions upony said turntable including means for adjustingsaid support bodily upwardly and downwardly through a series of parallel substantially horizontal positions and for adjusting it also when ln different ones of such positions, in each case about a transverse axis, to position it, inv different angular relations to the horizontaLwithitsrear end at least partially received in the hollow center of said turntable, said supporting and adjusting means including means acting adjacentthe longitudinal `center of said support to exert a raising force Athereon,`and extensible and contractible meansv -acting on said support forwardly of the rear endy y of the latter to exert a tilting force thereon.

5. In a'inining apparatus, the combination comprising a-portable base, a horizontal turntable mounted on said base, .said turntable having an" open center, kerf cutting mechanisnL and means for adjusting said kerf cutting mechanism through a wide range of horizontal 'cutting po- `sitions including a frame overlying said base, said kerf cutting mechanism being'carried by said frameiand including a pivotally supported kerf cutter, and means` for supporting said frame in a --horizontal position a substantial distance above said turntable and for adjusting said frame when so disposed into a 'relatively inclined position wherein the rear-end of saidrframe` is disposed vat least in part within the open center vof said turntable, said supporting means including re1- atively upper and' lower adjustable supporting linkage devices on said turntable pivotally connected to said frame Ion spaced axes in advance of the rearward end of said frame, and means in- I corporated in certain of said devices for changing the veffective length thereof to tilt said'frame about one of said axes 'to position the rearward end of saidframe within the open center of said turntable.

6. Ina mining apparatus, in combination, a A

portable base, an open-centered turntable thereon, a kerfA cutter, and'means'l for adjusting said kerf cutter througha wide range of horizontal cutting positions including an elongated boom,

eisernes ,sadkerf cutterlbeing pivoftallyfsupportedfonthe forward end vof saiclboom, Sand Vmeans intermediate said turntablelland said iboomior adjusting said boom relative :to said turntableandssupport- 'ing vit in :different Yadjusted positions including relatively higlh1an`d`` relatively flowlhorizon-talLpof sitions and selectively inlinclinedfpositionstiited .upwardly and downwardly when in idiierent ,raised positions, said -supportingrandadjusting means including link devicessupported 'byf-said yturntable yand each `:connected 1Vto isaid boom at `points Well forwardfof the' rearwardeendkthereo,

means foreiecting swinging of said link devices,

vandineans -for changing thefrel-ative ieng-ths'of uiting of the forward emi orsaidbeomlwhen saidboom isin raised position.

f7. In a mining apparatus, infco` Vbin-ation, `'a portable base, a turntable rotatable-i1ponsaid base uponanA upright axis andf having anA opening in the top thereof; a" kerf cutter, and means for adjusting-said kerf cutter through'a wide irange lof horizontal cutting -positionslincluding fan elongated boom structure, said lierf cutter being carried at the f forward end of 'lsaid `boom struc-- ture and mounted thereon "for tilting relative theretolabout a transversel axis, ianidrn-eans-Yf-or supporting said yboor-.n structure "on -saidturn' table for-bodily adjustmentupwardly and down- -Wardly between substantially lparallel, *diife'rent- 1y elevated positions and foris'electively -eiecting such adjustments and also at willirearward-rin- -clnation of said boom structure inits'diff'erentL ly/elevatecl positions, saidisupportin'gfmeans irn-` c'luding link devices7 pivotall;7 mounted "O n' Asaid turntable `respectivelyat a `point fradjacent "the back of the latter and at a point"forward of the rearward edge oi said opening and-connectedjat their opposite 'ends to `sai-d v'boorlr:structurant points which areboth in-advance of said second mentioned point whensaid lboom structureisin lowered horizontal positlonfthe points .o fsad connection of said `link ldevices fwith` said :boom structure being located a substantial distance "in advance of the rear end of*saidjboornstructure and the rear end ofsaid jboorn structure project'- ing rearwardly ireelyof anyfsupportother than said points of connection off-saidliiik ldevices"` therewith, andthe rear endtoi said booml'st/ruc-l ture when said boom structureishorizontalgand in lowered Aposition being'forwardof saidffirst mentioned point and `to jthe,rearof said second mentionedpoint whereby upon; rearward inclina; tion of said boornstructure atvarioujsfelevations thereof said freely projecting rea'rqnd ci said boom 'structure is 'positionable within said cpc-gn;4 ingjin saidturntable. f

8.11m a mining apparatus,

v of said support overlying thehollow'centerjin said turntable, said- Mkerf Jnuttingrinelianismbe? ing supportedV on the'ou'terend fvsaidsupport in .combinatioma portable base, a hollow-center turntable",on`said bnssai'd turntable-and forselectivelyiadjustingiit bodily into diierently l elevated :horizontal Yposi-` tions irellative to .the turntable Vand ffor l inolining 'itlupwardly or downwardly at-its outerJend dn various i elevated .positions in'cluding i its itoprn'ost Iene, said supporting fm'eans 'liavingconnetion with `said elongated support -at :points @spaced a substantial ydistance lforii/ardly of x:the inner "end of said support with saidinnerlendieffsaidisup .portfprojecting rearwardly.froe'li7 Aoi? any support other thanrsaid points fof connection iwi-th said supporting means, :said supporting means kbeing adjustable .to frnovelsaid support when .in differently Le-levated .positions to `bring its freely fproecting` innerfend into thelhollow'center-of said turntable, .said supporting andadjusting :means including adjustable supporting-,means extending betweenlthe marntableiandisaidisuppoift and npivotally cor-infectedv to saidfsuppoiit-at pointslpfacone nection :which are.` further-from the inner'ieni ofsaid-siipfportithantheilengthcoifisaid supporti'n Fmeans.-

T9.2Ir1"aiiinining apparatus, 2in combination, fa portab-le'l ibase, la Iturntable 'rotatable upon :said :base upon an: upright' 'axis andi :anop ening inflthfeir top itlrerenf ,'fa '-'kerf i cutter, and :means Afior adjusting said tkeri cutter through a wide range lof horizontal cutting :positions .including #en and 'including a kort cutter fpivotally lconn-ected y to* said supp'ortlforf 'tilting i onfa transverselaxisg andirneans for supporting-saidelongatedsupport elongated boom' lstrubi-,uregsaid lrerffnutterbeing pivotally supported iatzthe'fforward end :or said jend of sai'd boom :structure proects rearwardly Yfreely of Iany supportotherthawsaid points of connection with said-isupportingimeans, saidfsup porting means being-.adjustable to eiieettiltingoi said boom Lstructure whenithe same isinY dinerT entlyl elevated positions ftobring A said freely Aprojecting=rearward1 end thereofinto the opening in the top of` said turntable f-whilefs-alidfkerf# cutter -is further lelev-ated; and including link-devicespiv.l otally :mounted on .l said f turntable respectivelyn on parallel aires near the rear and near'the center thereof 'and respectively Ipivotally connected to :saidtboom structure at saidpoints `of l connection one o'f --which when said boomdstructure is in'hori'- Zontal lowered# position is ahead of f the center' of the turntable andlanother point-of which lies-at la distance fromthe rear-*end'of'sad boom struc-v ture-greaterithan-the length of^said linkdevices which are lconnected --at vsaid "last mentioned point. 1 i 1 10. '-In amining apparatus, a portable base,` a hollow-center turntable-on -said basefkerf cutting mechanism, and means -or adjusting said kerfcutting mechanism through a wide range of "horizontal cutting positions includinga l support overlying said turntable and-projectingfor# vWardlyifromsaid turntable and also rearwardly over the center osaidturntable,said kerf cutting mechanism being supported on they for-j w-ardly projecting end of ysaid support, andiincluding a pivotally lsupported Alzerf cutter vand means lier-supporting said support in vdiierent positions -upon said A turntable and Lhaving connection with -saidsupport at"- points spaced afsubstantial distance forwardly of -the rear 'end Aof saidL support-iso that-said Y`rear fend of said xsupportprojects rearwardly freely of any support other thansaid points of connection, said sup` porting means including means for adjusting said support bodily upwardly and downwardly through a series of parallel substantially horizontal positions and for adjusting it also when in different ones of such positions in each case about a transversepaxis to position. it in different angular relations to the horizontal'with said freely projecting rear end at least partially; received in the hollow center of said turntable, said supporting and adjusting means includingfmeans acting adjacent the longitudinal center of said support to exert a raising force thereon and eX- tensible and contractible means actingv on said support forwardly of said rear end of the latter to exert a tiltingfforce thereon.

1,1.'In a mining apparatus, the combination comprising a portable base, a horizontal turntable mounted on said base, said turntable having an open center, kerf cuttingmechanism, and means for adjusting said kerf cutting mechanism through a wide range of horizontal cutting positions including a frame overlying said'base, said kerf cutting mechanism being carried by said frame, and including a pivotally supported kerf cutter and adjustable means for supporting said frame and having connection with the latter at points spaced a substantial distance forwardlyA of the rear end of said frame and said rear end of said frame projecting rearwardly freely of 'any support other than said points of connection, said supporting means being adjustable tolocate said frame in a horizontal position a substantial distance above said turntable and alsoadjustable to locate said frame in a relatively inclined position whereinsaid freely projecting rear end Vof said frame is disposed at least in part within the open center of said turntable, said adjustable supporting means including relatively upper and lower adjustable supporting linkage devices on said turntable pivotally connected to said frame on spaced axes at said points ofy connection in advance of the rearward end ot. said frame, and means incorporated in certain offsad devices for changing the effective length there'- of to tilt said frame about one yof said axes, to position said freely projecting rearward end of said frame within the open center of said turntable. l -i 12. In a mining apparatus, in combination, a portable base, an open-centered turntable, on said base, a kerf cutter, and means for ,a'djusting said kerf cutter through a wide range of nariz ontal cutting positions including an elongated i boom, said kerfl cutter being pivotallysupported at the-forward end of said boom, and means extending between said turntable and said boom for adjusting said boom relative to said turntable and for supporting said b'oorn in different adjusted positions, said supporting means having connection with said boom at points spaced a substantial distance forwardly of the rear end of said boom so that the rear end of said boom projects-rearwardly freely of any support other than said points of connection, said supporting means being adjustable to support said boom in `different `adjusted positions includingrelatively high and relatively low horizontal positionsand selectively in inclined positions tilted upwardly and downwardly when in different raised positions, including link devices supported by saidrturntable and each connected to said boom atsaid points well forward of said rearward end thereof so that said rearward vboom end projects Yfreely rearwardly as' aforesaid, means for eifecting swinging of said -link devices, and means, for changing the relative lengths of said link devices, the lengths and the. points of connection of said link devices with said boom and said freely projecting rear end of said boom being suclras` to enable disposition of said freely projectingrear boom end Within ,the open center of said turn:-

table by upward tilting of said boom vwhen said y boom is in raised position'.

13.,In a miningapparatus, in combination, a portable base, a turntable rotatable upon said base upon an upright axis and having an openingin the top thereof,r a kerf cutter, and means for adjusting said kerf cutter through a wide range of horizontal cutting positions including an elongated boom structure, said kerfy cutter beingpivotallyl supported at the forward end of said boom structure, and means for supporting vsaid boom structure on said turntable forbodly adjustment upwardly and downwardlybetween v substantially parallel, differently elevated positions and for selectively effecting such adjustments andalso at will rearward inclination ofsad boom structure in its differently elevated positions, said supporting means including link devices pivotally mounted on saidy turntable re.v

freely of any support other than said points of I connection of said link devices therewith, and the rear endof said boom structure when said booml structure is horizontal and in lowered po- 4 f sition being forward of said i'lrst mentioned point y and to the rear of `said second mentioned point whereby :upon rearward inclinationbf said boom structure at various elevations thereof said freelyV projecting rear end of said boom structure is Vpo-` sitionable within said opening in said turntable, certainof said vlink devices having means for varying their effective length to effect such inclination of said boom structure.

l14. In lamining apparatus, in combination, a portable base, a turntable rotatable upon said base upon an upright axis and having an open ing in the top thereof, akerf cutter, and means for adjusting said 'kerf cutter through awide range of horizontall cutting positions including anelongate'd boom structure, said kerf cutter being pivotally supported at the forward end Yof said kboom structure, and means for supporting said boom structure upon said turntable for bod? ily adjustment up and down between substang i tially horizontal positions respectively closely adjacentto the top of ysaid turntable and spaced a substantial distance above it,l said supporting means having connection with said boom struc,- tureat pointsspaced a substantial distancefsrwardly of the rearward yend thereof so that the rearwardl end ofsaid boom structure projects rearwardly freely of any support othertharrsaid points of connection with said supporting means, said supporting means beingadjustable'to effect tilting-vof saidboom structure when vthe same 'is' nvdifferently elevated 'positions' to lbring said freely projecting rear endl thereof into the openaa'aa ingf inthe vtopoff'said turntable korf cutteris further elevated, said supportingmeans including link devices pivotally/"mounted on said turntable respectively on 1 parallel aX'S,` near `the' rera and nearV the center ,thereof andrespectivelyf pivotaliyconrrectedto said boomstructure at said points ofV connection', said points of connection o with said boomstructureV being, when saidboom of said link devices having'rneans'for altering v the effective iengtnftnereof.

to effect tilting of said boom structure as aforei said. 1

15. Ina mining apparatus, the combination comprising a portable base,f a horizontal turntable mounted on said base, said turntable having an open center, kerf cutting mechanism, and means for adjusting said kerf cutting mechanism through a wide range of horizontal cutting positions including a frame overlying said base, said kerf cutting mechanism being carried by said frame and including a pivotally supported kerf cutter, and adjustable meansrfor supporting said frame and having connection withy the latter at points spaced a substantial distance forwardly of the rear end of said frame and said rear end of said frame projecting rearwardly freely of any support other than said points of connection, said supporting means being adjustable to locate said frame in a horizontal position a substantial distance above said turntable and also adjustable to locate said frame in a relatively inclined position wherein said freely projecting rear end of said frame is disposed at least in part within the open center of said turntable, said adjustable supporting means including" relatively upper and` lower adjustable supporting linkage devices on said turntable pivotally connected to said frame on spaced axes at said points of connection in advance of the rearward end of said frame, andimeans incorporated in certain of said devices for changing the eiective length thereof to tilt said frame about one of said axes to position said freely projecting rearward end of said frame within" the open center of said turntable, said lower linkage device being pivotally connected to said frame near the forward end of the latter and said upper linkage device being pivotally connected to said frame near the upper part thereof at a point spaced a substantial distance rearwardly of said pivotal connection' of said lower linkage device with said frame.

16. In a mining apparatus, a portable base having a circular opening in the top thereof, an annular member sup-ported within said opening for rotation on a. vertical axis, an elongated support projecting forwardly from said portable base and having its rearward end extending over said annular member, a cutter lbar nXed to theforward end of said elongated support, and means for supporting said elongated support upon said annular member for bodily adjustment into different horizontal positions and also for tilting ysaid support in any of Vits positions to bring the rearward end thereof downwardly within said annular member, said last -mentioned means including link devices pivotally mounted on said annular member on horizontally spaced parallel axes and pivotally connected to said elongated support at points spaced along its length, certain Vlv'lbjignjja j "ining "apparatus, portableV base having.' a lcircular opening in the top thereof,` an i annular member ,supported on saidvbase surrounding saidopening'for rotation on a verticalaxis, anY elongated boom 'structure projecting forwardly jfronr `said "portable base; and lhavingits rearward. endiextending over' said Opening, a cut-` ter bar ixie-dfjtov the forwardend of. saidbofom structure, "andmeians 'forsupportin`g said boom structure upon said annular member for bodily adjustment through a series of parallel horizontal positions'and for swinging said boom structure about a transverse axis when it is in any of said horizontal positions to position the rear end of said boom within said opening, said last mentioned means including link devices pivotally connected to said annular member and to said boom structure on horizontally spaced pare alle] axes, certain of said link devices having means for altering the'effective length thereof, and extensible means pivotally connected to said annular member in advance of said link devices and pivotally connected to said boom structure for exerting'a raising force on the latter.

`18. In a mining apparatus, a portable base, a turntable on said base rotatable on a vertical axis and having an open center, an elongated boom structure projecting forwardly from said portable base and having'its rearward end extending'l over the open center of said turntable, a cutter bar xed to the forward end of said boom structure, and means for supporting said boom structure on said turntable for bodily adjustment within a vertical plane and for swinging said boom structure in any of its adjusted positions about a transverse horizontal axis so that the rear end of said boom moves within the open .center of said turntable, said last mentioned means including eXtensible and contractible devices pivotally connected to said turntable and to said boom on horizontally spaced transverse parallel axes. Y

19. In a mining apparatus, a portable base,

of said frameimaybe swung downwardly into the open center of said turntable in any of a wide range of upwardly adjusted positions of said links about their connections to the turntable, means for effecting upward swingingof said links, means also pivotally connected to said turntable and to said frame for selectively effecting either maintenance of said frame in a substantially horizontal position during upward and downward 4swinging movements of said links or relative swinging between said frame and said links to bring the rear end of said frame into the open center of said turntable, and cutting mechanism pivotally supported on the outer end of said elongated fraine.

20. In a mining apparatus, a portable base, an open-center turntable supported on said base, links pivotally connected to said turntable, a frame to `which said links are pivotally connected on alined axes at points substantially forward 0f the inner end of saidframe, the portion of said frame to the rear of said points and said links of such relative lengths and the pivotal .con-

neotions of said links to saidturntable so located with respect to the latter that the rearwardenc of saidfi'ame may be swung downwardly .into

www

ing either substantially horizontal dispositionioi said frame at diierent elevations upon swinging movement of said links, or disposition ofthe of said turntable in differently swung positions inner end of said frame within the open' :eriizefrgl of said links, or disposition of said frame in an. outwardly and downwardly inclined position, and Y cutting mechanism pivotally supported -on the.r

outer end of said elongated frame. l. n

HARLEsRosGooD.

CERTIFICATE oF CORRECTION. Patent No. 2,527, 928. August 2LT, 1915.

CHARLES E. osGooD.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, second column, line li, for "prererablyn read --preferably-; page 5, first column, line 57, for "annnular" read --annular--g line 'Zip-75, for "pivto" read -piVot-; and second column, line 2l,for "chamber" read -cylinder; line M8, for "bottom" read boom; page 14 second Column, line l9, after "swinging" insert --cylinder; page 6, second column, line l5, claim 5, after "structure" strike out the comma; page 8,-first column, line 26, claim ll, after "frame" strike out the comma and insert the same after "cutter" line 2'? same claim; page 9, first column, line 5, claim lll., for "rera" read -rear-; line?, same Claim, before "said" insert one of; and second column, line )46, claim 19, for "an before "open-center read an; and

that the said Letters Patent should be read with this correction therein that the s ame may' conform to the record of the case in the Patent Office.

signed and Sealed this 9th day of November, A. D. 1915.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents.

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