US2007903A - Mining apparatus - Google Patents

Description

C. G. BOUDETTE MINING'APPARATUS Original Filed July 13, 1931 3 Sheets-Sheet l Enuenior:

July 95 1935 c. G. BOUDETTE MINING APPARATUS Original Filed July 15, 1931 3 Sheets-Sheet 2 Y 1935. c. G. BOUIDETTE MINING APPARATUS mum I Original Filed July 13, 1931 5 Sheets-Sheet 5 Ewan/War.

Patented July 9, 1935 MINING APPARATUS Cornelius G. Boudette, Claremont, N. H., assignor to Sullivan Machinery Company, a corporation of Massachusetts Continuation of application Serial No. 550,469,

July 13, 1931. This Serial No. 719,169

application April 5, 1934,

3 Claims. (Cl. 262-28) This invention relates to mining apparatus and more particularly to improved. adjustable kerf. cutting mechanism for such an apparatus.

An object of this invention isto provide an improved coal mining apparatus. Another object is to provide an improved coal mining apparatus having improved adjustable kerf cutting mecha-' nism. A further object is to provide an im-' proved coal mining apparatus of the wheel mounted, track guided type adapted to operate from the mine trackway and having improved adjustable kerf cutting mechanism whereby a horizontal kerf may be out at the level of the mine bottom outside and below the level of the mine trackway- A further object is to provide an improved coal mining apparatus of the so-called combined type having improved adjustable kerf cutting mechanism adapted both for horizontal cutting and shearing. Still another object is to provide an improved adjustable kerf cutting mechanism for a mining apparatus of the aforesaid character having improved adjustable kerfcutter supporting means whereby the kerf cutter may be positioned ,to cut a horizontal kerf at the level of the mine bottom outside and below the level of the mine trackwayand havingassociated therewith improved kerf cutter swinging means. Yet another object is to provide, in a mining apparatus of the aforesaid character,

improved kerf cutter swinging means capable of' effecting swinging of the kerf cutter ineither horizontal or vertical planes in an improved manner. These and other objects and advantages of this invention will, however, herein-- after more fully appear.

In the accompanying drawings there is shown, for purposes of illustration, one form which the invention may assume in practice.

. In these drawings,-' r

Fig. l is a plan view of the illustrative embodiment of the improved mining apparatus.

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

Fig. 3 isan enlarged plan view of the forward or cutter carrying end of the apparatus'shown in Fig. 1, the top coverbeing removed to show the internal mechanism. 0 V

Fig. 4. is a longitudinally extending vertical sectional view taken substantially on line 4-4 of Figs. 1 and'3.

.Fig. 5 is a horizontal sectional viewtaken substantially on line 5-5 of Fig. 4; i it In this illustrative embodiment of the invention there is shown a mining machine of the same general type as that disclosed in the patent to Morris P, Holmes, Patent No. 1,785,961, patented December 23, 1930 and having an improved adjustable kerf cutting mechanism of the same general type as that disclosed in the copending application of Morris P, Holmes, Ser. No. 415,051, filed December 18, 1929, patented 0ctober 25, 1932, No. 1,384,693, with improvements incorporated therein, as hereinafter described. The

mining apparatus generally comprises. a truck frame I mounted on truck wheels 2 adapted to run along a mine trackway 3. Supported on the truck frame I within transverse bearing frames 4 and 5 for rotation about a longitudinally extending axis relative to the truck frame is a supportor body 6 carrying the improved adjustable kerf'cutting mechanism generally designated 1. Supported within the rotatable supportor frame 6 and arranged with its axis alined with the support axis is a horizontal motor 8, herein preferably of the reversible electric type, having its power shaft horizontally disposed and extending longitudinally of the apparatus. This motor 8 eifects drive of the truckwheel driving mechanism forpropelling the apparatus along the mine trackway, and the mechanism for rotating the supportfi about its axis relative to the truck frame, in the manner clearly described in the above mentionedHolmes patents, and as these mechanisms do not specifically enter into this invention, further description of the same herein is thought unnecessary.

, Now referring to the improved adjustable kerf cutting mechanism 1, it will be noted that supported on the forward end of the rotatable support 6 for rotation therewith is a cutterhead 9 having pivotally mounted, thereon a horizontally extending arm or extension frame l0 which in turn provides at its outer extremity a pivotal support for the kerf cutter II, the kerf cutter being swingable by power through improved connections to behereinafter described relative to the extension frame It] and with the extension frame about the extension frame pivot. The kerf cutter comprises a plane cutter bar l2 having mounted on its margin, for circulation thereabout, a cutter bit-carrying chain 13. The driving connections between the motor 8 and the cutterj chain l3 herein comprise, as shown in Fig. 4,

a shaft '14 alined with and driven by. the motor power shaft. Fixed to the shaft M'- is a spur pinion I5 meshing with a spur gear l6 fixed to a longitudinal shaft herein arranged parallel with'theshaft l4. Fixedto shaft I1 is a bevel pinion I8 meshing with a bevel gear 19 suitably journaled within the cutter head9, and thisbevel gear meshes with a bevel gear 23 fixed to a longitudinally extending horizontal shaft 2! herein suitably journaled within a bearing bracket 22 formed on the swingable extension frame i0. As shown, keyed to the shaft 2! is a spur gear 23 meshing with a spur gear 24 keyed to a horizontal shaft 25 having its axis extending radially from the axial line of the extension frame pivot and suitably journaled within the extension frame. Keyed to the forward end of the shaft 25 is a bevel pinion 2E meshing with a bevel gear 21 which is connectible by a sliding clutch 28 to a shaft 29 herein arranged with its axis coincident with the bar pivot axis and suitably journaled within the outer extremity of the swingable extension frame Ill. Keyed to the shaft 29 is a chain sprocket 313 which engages and drives the cutter chain l3 in a well known manner.

The mechanism for effecting swinging of the extension frame it about its axis relative to the cutter head 9 comprises a shaft 3i arranged with its axis coincident with the extension frame pivot and suitably journaled within the cutter head 9, as shown in Fig. 4. The hub of the bevel gear i9 is provided with clutch teeth $52 which are conneetible to the teeth of a sliding clutch mem ber 33 splined to the shaft 3i. This sliding clutch member is provided with suitable shifter mechanism including a pivoted shipper yoke It will thus be seen that when the clutch 33 is connected, the shaft 3i may be driven by the bevel gear E9 of the cutter chain driving mechanism. As shown in Figs. 4 and 5, fixed to the shaft ill is a worm 35 meshing with a worm wheel 36 keyed to a horizontal shaft 3'5 herein arranged transversely of the cutter head and suitably journaled within the swingable extension frame ill. Journaled on the shaft 3? and connectible thereto by a multiple disc clutch 38 is a worm 39 meshing with a worm wheel 48. This worm wheel is journaled on a shaft 4| likewise suitably journaled within the extension frame iii and this worm wheel 40 is con'neetible to the shaft '5! by a sliding clutch 42. The shaft 4-! drives a spur pinion 43 meshing with the teeth of a large internal gear 44 journaled within the cutter head. Also rotatably mounted on the shaft 31 and connectible thereto by a multiple disc clutch 45 is a worm 46 similar to the worm 39, but having oppositely inclined teeth, meshing with a worm wheel 41' journaled on a shaft 48 in turn suitably journaled within the swingable extension frame l and the worm wheel 41 is connectible with the shaft 48 by a sliding clutch 59. Driven by the shaft 48 is a spur pinion f! likewise meshing with the teeth of the internal gear 44. As shown in Fig. 5, the clutches 38 and 45 are provided with suitable shipper mechanism including pivoted shipper yokcs 5i and 52 and an operating handle 53, while the sliding clutches 42 and 49 are provided with suitable shipper yokes 54 and 55 respectively having an operating handle 56. It will thus be seen that upon suitable application of the disc clutches 38, 45 and connection of clutches 42 and 49, the internal gear 44 may be driven in one direction or the other. It is accordingly evident that when the internal gear 54 is held against rotation relative to the extension frame H), the extension frame may be swung relative to the cutter head 9 in one direction or the other, and that when the disc clutches 38 and 45 are released and one of the clutches 42, 48 is connected, the extension frame is locked automatically by the self locking worm gearing of the swinging mechanism. When the clutches 38, 45

and clutches 42, 49 are all released, the extension frame is free to swing relative to the cutter head. As shown, the extension frame 16 is journaled for swinging movement within sleeve bearings 5'! and 58 carried by the cutter head frame, and the internal gear 44 is rotatably mounted in bearing sleeves 59 carried by the extension frame and held in position by a retaining ring 66 bolted to the cutter head frame. The means for holding the internal gear 44 against rotation relative to the cutter head frame may assume various forms, but in this instance comprises, as shown in Fig. 4, a spring pressed plunger lock 6| reciproeably mounted in a bore 622 formed in a boss integral with the retaining ring (it. The plunger lock 6| is adapted to enter apertures 63 formed in bosses formed around the periphery of a member 64 bolted to the internal gear 44. The lock 6| is held in looking position by a coiled spring 65 acting thereon, and is provided with a handle 86 for the release of the same. A projection 6'! is formed on the lock 6 l, and when the lock is pulled outwardly and then turned, the projection holds the lock in its released position. It will thus be seen that as the bore 62 is in registry with one of the apertures 63 the internal gear 44 may be locked positively to the cutter head frame, and when the lock is released may rotate freely relative to the cutter head frame. New referring to the improved mechanism for swinging the cutter bar !2 about its pivot relative to the extension frame I it will be noted that the member 84 secured to the internal gear id forms a bearing support for one end of the shaft SI and has clutch teeth 68 connectible by a sliding clutch 69 to clutch teeth ill formed on the hub of a sprocket "H rotatably supported on the shaft 35. The sliding clutch 69 is provided with suitable shifter mechanism including a pivoted shipper yoke 12 and an operating handle ?3. As shown in Fig. l, the sprocket 'II is connected by an endless chain 14 to a sprocket l5, herein formed integral with a cylindrical bearing support 76 for the cutter bar iii. The bearing mounting 16 for the cutter bar is journaled in a bearing sleeve 11 carried by the outer extremity of the extension frame I G, as illustrated. It will thus be seen that when the lock ill is in its released position and the internal gear as is free to rotate relative to the extension frame it) and the clutch 69 is connected, the sprocket "H may be driven by the internal gear 44 while the extension frame In remains stationary as regards swinging movement relative to the cutter head, and as a result, the cutter bar is swung about its pivot relative to the extension frame through the chain and sprocket connection l4, 15. It will also be evident that when the clutch 69 is released, and the internal gear 44 is held against rotation relativeto the cutter head frame, the extension frame may be swung about its pivot relative to the cutter head while the cutter bar is freely swingable relative to the extension frame. If desired, however, the cutter bar may be held against swinging movement relative to the extension frame during swinging of the latter about its pivot, by any suitable means, for instance by a spring pressed plunger lock 18 similar to the lock 6i and having a release handle 19 and adapted to enter apertures =80 formed in a flange 8! formed integral with the bearing mounting 76 for the kerf cutter. The lock i8 is held released in the same manner as the lock (Si, by a projection 82. The extension frame 15 is held against swinging movement'relative to the cutter head during swinging of the cutter bar I as releasedat will. a 1;

'aoomos 1' by any suitable means, herein a 83 insertible within registering aperfexterision framedflf respectively. As shown in f1; thezcutte'r head is provided in appropriate 3 locations witha' pluralityof apertures 84 to en able locking of the extension frame in a plurality of angular positions relative to the-cutter head. Itwill thus be seenthat the cutter bar may swing freelyrelative tothe extension frame or may be positivelylocked against swinging movementrelative thereto by the=lock I8, and that the extensionframemay be locl zed to-the cutter head or Asthe modeof operation of the mining apparatus disclosed herein is clearly described in the first "above mentioned Holmes patent, and as the methd of operation of the kerf cutting mechanism and the mode of adjustment thereof is clearly described inthe-s'econd mentioned Holmes patent, a further description of the mode of operation of the improved apparatus is thought unnecessary other than-to state that the extension frame 5 m may be swung. relative torthe-cutter head 9 and thecutter bar I [may be swung relative to the "extension frame atlthe will of the operator, that thesupp'ort 6 may be; rotated within its bearings relative to the truclr frameito position the cutter .ihead 'il into either a horizontal or a shearing posittion andthat the cutter bar may be swung about its pivot to eiTecteither-a horizontal or'a shearing -z.1cut'.-= "These and other'uses and advantages of the improved adjustable kerf cutting mechanismwill 'beclearly apparent to those skilled in the art.

:tiWh'ile there isin this-application specifically described one form whichlthe invention may assume in practice; it will be understood that this form of the same isshown for purposes of illustragtion andrthat the invention maybe modified and embodied in various other forms withoutdepartaingfrom its spirit orthe scopefof the appended claimsi v I M This is acontinuation of my application Serial (No. 550,469 filed July 13, ,1931, Mining apparatus.

:LettersPatent is: l 1 In a miningapparatus,

What I claim as new ancldesire to secure by a portable base and kerf cutting mechanism mounted'on said base includinga horizontal arm pivotally mounted on the base for swing about a vertical axis adjacent aarm relative to said baseand said kerf cutter relative to saidarm and including gearing common to the swinging of said arm and kericuta ter and arranged on said arm at the rear of the armpivot and swingable with said arm during arm swing. ,1 s 1 2. In] amining apparatus, a portablebase and 1 kerf cutting mechanism mounted on said base including ahorizontal arm pivotally mounted on said ,basestoswing about a vertical axis located 1,5

mounted on the outer extremity of saidarm, and

mechanismwfor swinging said arm and kerf ,cututer about their respective pivots including motor operated-' kerf cutter and arm swinging devices carried-by the rearward extremity of said arm at .includinge' ahorizontal arm pivotally mounted in 'advanceof said base, a kerf-cutter pivotally the rear of the armpivot axis. 3. In aminingapparatus, a portable base and kerf cutting mechanism ,mounted on said base .011 said: baseit swing about f-YflYu M axis 7 19- devices carried by the rearward extremity of said arm, said devices including a reversemechanism for effecting swinging of said kerfcutter in either of opposite directions without reversing said keri cutter.

4. In a mining apparatus, a portablebaseiand kerf cutting mechanism mounted on said base including a horizontal arm pivotally mounted on said base to swing about a vertical axis located in advance 'oisaid base, a kerf cutter pivotally 'mounted on the outer extremity of said arm, and 1;

, mechanisnr for swinging said arm about :its pivotrelative to said base and for swinging said -l:erf cutter relative to said arm including a common kerf 1 cutter swinging and arm swinging gearing carried by the rearward extremity of said 5. In" a 'mining apparatus, aportable basegand kerf' cutting mechanism mounted on said base including a horizontal arm pivotally mounted on said base to swing about a vertical axis located in advance of a said base, a kerf cutter pivotally mounted on the outer extremity of said arm, and mechanism for alternatively swinging said'arm and kerf cutter and each in either of opposite directions, including a common kerf cutter. and arm swinging reverse gearing carried, by the rearward extremity of said arm.

6. Ina mining apparatus, a portablebaseand kerf cutting mechanism mounted on said base including an arm pivotally mounted on said;

ment relative to said base'to effect swinging of said kerf cutter.

7. In a mining appal'atusaa portable-base and 1' kerf cutting mechanism mounted on said base including an arm pivotally mounted on said base to swing horizontally relative thereto, a kerf cutter pivotally mountedonthe outer extremity of, said arm, and mechanism including common swing gearing for swinging said kerf cutter relative: to said arm and said arm relative to said base and including locking devices for holding said arm against swinging movement relative to said base during swinging of said kerf cutter including a releasable lock for holdingsaidarm in different angular positions relative to said base ,to efi'ectkerf cutter, swing. I

8. In a mining-apparatus, a portablebasa a support thereon having its outer extremity overhanging saidbase, and kerf cutting mechanism mounted on said base including-a horizontal arm pivotally mounted on the outer overhanging extremity of said support, a kerf cutter pivotally mounted on the outer extremity of "said arm, and ,mechanism for swinging said kerf cutter relative to said arm including a driven element secured to said kerf cutter,,, a driving elementv at the rear extremity of said arm, a driving connection extending between and connecting said driving and driven elements, and

ing released during kerf cutter, swing.

n a genera es a redeblsbe a a extension frame-pivotally mounted on the.for award tend .of ,said ,base for horizontal swinging movement relative 'theretoabout a vertical axis locatediin advance. of said ,base, a kerf cutter '5 :pivotally mounted on the outer extremity of said.:exten sionaframe for swinging, movement relative thereto,.and mechanism for swinging said ukerf :..c.utter,relative to said extension frame including kerf cutter swinging gearing carried :within...the rearward portion of the said extension frameand swingable bodily withv the latter :aboutrthe frame axis during frame swing.

10..-:In amining apparatus, aportable base,'an .extensionframe pivotally mounted on the for- ;.wa.rd :end .of said base for horizontal swinging movement relativethereto, a kerf cutter pivotally :mountedon the'outer extremity of said extension frame for swinging movement relative thereto, rmechanismiforswinging said kerf cutter relative '10 itoisaid extension frame including kerf cutter swinging gearing carried within the rearward iportionqof the said extension frame at the rear :orthe frame pivot and swingable bodily with the rframezabout'the pivot thereof during swinging of said frame, and a driving element for said gearingaarranged with its axis alined with the exitension'framex pivot axis.

;1l.=In a mining apparatus, a portable base, an elongated. extension frame pivotally mounted-on 90 the forward end of said base for horizontal swinging movement relative thereto, a kerf cutter pivo tally mounted on the outer extremity of said .extension frame for swinging movement relat-ive thereto about an axisparallel with the ex- 96 tension frame pivot, and mechanism for swinging :sai'dkerf cutter about its pivot relative to said extension frame including clutch controlled kerf :cutter swinging mechanism carried within the rearward portion of said extension frame and ,40 including a transverse shaft journaled within -the rearward portion of said extension frame.

12. In a. mining-apparatus, a portable base, an -extension.frame pivotally-mounted on the forward end of said base for horizontal swinging g5 movement relative thereto, a kerf cutter pivotally -mounte'd on the outer extremity of said extension frame for swinging movement relative thereto, mechanism for swinging said kerf cutter about its pivot relativeto said extension frame including clutch controlled kerf cutter swinging mechanism carried within the rearward portion of said extension frame and including a transverse shaft journaled within the rearward portion of said extension frame, and a-shaft alined with the ex- 'ten'sion frame pivot axis and operatively connected to'said transverse shaft.

135 In a miningapparatus, a portable base, an extension frame pivotally mounted on the forward end of said base for horizontal swinging move- 160 ment relative thereto, a kerf cutter pivotally mounted on the outer extremity of said extension-frame for swinging movement relative thereto, and mechanism for swinging said kerf cutter about its pivot including clutch controlled kerf cutter swinging mechanism carried within the rearward portion of said extension frame and includinga transverse shaft journaledwithin the rearward portionof said extension frame, a shaft ialined withfthe extension frame pivot axis and worm gearing connecting said shafts in driving :relation.

.14.In a mining, apparatus, a portable base, an extensionframe pivotally mounted'on the forward end; of said base for horizontal swinging r *movement relative thereto,a'kerf cutter pivotally tatable relative thereto during and to. effect kerf mounted on the outer extremity-,otsaid extension frame for swinging movement relative thereto, mechanism for swinging said drerf cutter about its pivot including clutchr controlled pkerf cutter swinging-mechanism carriedwithin-theirearward 5 portion of said extension frameand-includingta transverse shaft ,journaled .-.within .the rearward portion of saidv extension frame, a shaft ealined with the extensionframepivot-axis and operatively connected to saidtransverse shaftfor drive 10 vthereby, and gears coaxial withtsaid transverse shaft, onetoeffect kerf cutter swingdnone-xiirection andthe other in the reverse.- direction.

15. In a mining apparatus, a portablebase an extension frame pivotally mounted.- on :the vforward end 1 of said base for horizontal swinging movement, relative thereto, akerf cutter: pivotally ,mounted onthe outerextremity of 'saidxextension frame for swinging movement relativgthereto, mechanism for swingingsaidkerfcutterabout .its pivot including ,clutch controlledkerfrcutter swinging mechanism carried within-the; rearward portion of said extension frame andincluding ya transverse shaft -journaled within the rearward portion of saidextension frame, a shaft with the extension frame'pivot axis;and.operatively connected to .said transverse shaftfor drive thereby, gears coaxialwith saidtransverse shaft, one to effect kerf cutter swinging. inone direction and the other in the reverse direction, and 4.0 clutches for selectively connecting :said coaxial gears in driving relation .with :said transverse shaft. I

16. In av miningapparatus, iasportabletbaseya support mounted on thefforward end-of said'base for rotation relative thereto abouta longitudinal axis, an arm pivotally mounted on said rotatable support to swing relative thereto-anda kerf cutter pivotally mounted on the outer'extremity of said arm to swing relative to said arm, and motor opi erated devicesfor swinging said arm relative to said rotatable support and said kerf cutter relative to said arm, said arm'swinging and kerf cutter swinging devices being alternatively operable and including gearing effective to effect either swing :4 arranged at the rear of the arm pivot and swingable bodily with said arm about the arm pivot during arm swing.

17; In a mining :apparatus, :a :portable'base, a supportmountedon the "forward end of said base for'rotation relative. thereto about a:-longitudinal axis,-an armpivotally mounted :on said rotatable support and a -kerf cutter pivotally mounted on the outer extremity of .saidarm, and motor operated devices'for swinging :saidarm relative to-said rotatable support-and saidr kerf cutter" relative to said arm and including kerf cutter swinging gearing carried iwithin the rear portion of said=arm adjacent to and at the rear of said arm pivot and swingable bodily with the arm about thearm pivot during-arm swing.

18. In aminingapparatus,a-portable base and kerf cutting-mechanism mounted @on .said' base including a horizontal arm pivotally mounted on said base, a kerf cutter pivotally mounted on the outer extremity of said-arm, and mechanism for alternatively swinging said arm relativeito said base and said kerf cutter relative to= sald arm including a gear journaled-on-said -arm and ro- 7 cutter swings, andmeans for holding said gear stationary relative to said base=to-efiect swinging movement of-said arm.

19. In a-mining apparatus aportablebaseand kerf cutting a mechanism mounted-"on saidbase 7 cutter swing, and a releasable lock carried by said base and connectible to said gear for holding said gear stationary relative to said base to efiect arm swing;

-20. In a miningapparatus,-a-portable base and kerf cutting mechanism mounted on said base including a horizontal arm pivotally mounted on said base, a kerf cutter pivotally mounted on the outer extremity of said arm, and mechanism for alternatively swinging said arm relative to said base and said kerf cutter relative to said am in eluding a gear journaled on said arm and rotatable relative thereto during and to effect kerf butter swingfmeans forholding said gear stationaryrelative to said base to effect swinging movement of saidarm, and means for rotating said gear in either of opposite directions without reversing said kerf cutter.

i 21. In a miningapparatus, a wheel supported frame adapted to run along a mine trackway and overhanging in advance of the front x support wheels, an arm, pivotally mountedon the overhanging end of said frame to swing horizontally across the forward end of said frame, a kerf cutter pivotally mounted on the outer extremity of said arm to swing horizontally relative thereto'about an axis parallel with the arm axis, and mechanism including gearing carried by said arm and common to the'swinging of said armand of said kerf cutter respectively, for swinging said arm and kerf; cutter about their respective pivots, and

means for: rendering said gearing inoperative to effect arm. swinging during the swinging by said gearing of said-kerf cutter.

22. In'a'mining apparatus, a wheel supported frameadapted to run along a mine trackway and overhanging in'iadvance of the front support wheels, an arm pivotally mounted on the overhanging end of said frame to swing horizontally across the forward end of said frame, a kerf eutter pivotallymounted on the outerextremity of .said arm to swing horizontally relative thereto ,aboutan axis parallel with the arm axis, and

mechanism including reverse gearing carried by said arm and common to the swinging of said armand kerf cutter on their respective axes for swinging said arm andkerf cutter in opposite directions about their respective pivots, said reverse gearing being swingable bodily about the arm pivot during arm swing; I

23,, In' amining apparatus, a portable base, an armpivotally mounted on said base to swing horizontally relativethereto about a vertical axis ,locatedin advance of said base, a kerf cutter pivotally mountedon the outer extremity of said arm-to swing; relative thereto about a parallel axis, means including commonswing gearing for swinging said arm relative to said base and for swinging said" kerf 'cutterrelative to said. arm, eitherwhile the other is stationary, and releasablelocking devices for locking said arm against swinging movement relative tosaidbase during swinging of the kerf cutterand for locking said kerf cutter iagainstjswinging movement relative to said arm during arm swing.

-24; Ina mining apparatus, a portable base, an

arm pivotally mounted on said base to swing horizontallyv relative thereto about a vertical axis, a

kerf cutter pivotally mounted on the outer ex tremity of said arm to swing relative thereto about a parallel axis, and motor operateddevices for swinging saidarm relative to said base and for swinging said kerf cutter relative to said arm including a rotatable kerf cutter swinging ele- V 'cluding a rotatable kerf cutter swinging "element arranged with its axis coincident with the armpivot axis, and means for lockingsaid element against rotation during arm swing, and clutch devices for connecting said kerf cutter to said swinging element or releasing the "same therefrom at will. i 1

26. Ina mining apparatus, a portable base, an arm pivotally mounted on said base to swing horizontally relative thereto about a vertical axis, a kerf cutter pivotally mounted on'the outer extremity of saidarm to swing relative thereto about a parallel axis, motor operated devices for swinging said arm relative to said base and for swinging said kerf cutter relative to said arm'in- 27. In a mining apparatus, a portable base, "an

arin mounted on said base to swing horizontally relative thereto about a vertical axis locatedin advance of said base, a kerf cutter pivotally mounted on the outer extremity of said arm to swing relative thereto about aparallel axis, and motor operated devices for swinging said arm about its pivot relative to said base and for swinging said kerf cutter relative to said arm including a gearing common to both swingsand carried by said arm at the rear of the arm pivot axisand swingable bodily with the arm about the arm pivot during arm swing, said gearing being op erable to eifect alternatively swinging of said arm. and swinging of said kerf cutter each about its respective axis of swing.

.28. In a mining apparatus, a portable base, an arm mounted on saidbase to swing horizontally relative thereto about a vertical axis located in advance of said base, a kerf cutter pivotally mountedon the outer extremity of said arm to swing relative thereto about a parallel axis, and motor operated devices for swinging said arm about its pivot relative to said base and for swinging said kerf cutter relative to said arm including a'reversible gearing carried by saidarm at the rear of the arm pivot axis and swingable bodily with the arm about the arm pivot during arm swing, said gearing being operable to effect alternatively swinging of said arm and swinging of said kerf cutter, each about its own axis of swing, in opposite directions.

29. In a mining apparatus, a frame, an arm pivotally mounted on said frame to swing relative thereto, a kerf cutter pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel to the arm axis, and mechanism for swinging said arm relative to said frame and said'kerf cutter relative to said arm including a driving member rotatable about an axis coincident with the arm pivot axis, means for connecting said kerf cutter to said member for swing thereby, said means being released during swinging of said arm, and means for locking said member against rotation during arm swing.

30. In a mining apparatus, a frame, an arm pivotally mounted on said frame to swing relative thereto, a kerf cutter pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel to the arm axis, and mechanism for swinging said arm relative to said frame and said kerf cutter relative to said armincluding a driving element rotatable about an axis coincident with the arm pivot axis, means for connecting said kerf cutter to said element for swing thereby, said means being released during swinging of said arm, and means for locking said element against rotation during arm swing, said element being freely rotatable relative to said arm during; swing of the kerf cutter, and means for locking. said arm' against swinging movement relative to said frame during kerf cutter swing.

31. In a mining apparatus, a frame, an arm pivotally mounted: on said frame to swing relative thereto, a kerf cutter pivotally mounted on the outer extremity of said arm to swing relative thereto-about an axis parallel to the arm axis, and mechanism for swinging said arm relative to saidframe and said kerf cutter relative to said arm including a driving element rotatable about an axis coincident with the arm pivot axis, means for connecting said kerf cutterto said element for swing thereby, said means being released during swinging of said arm, means for locking said element against rotation during arm swing, and reverse gearing carried by said arm and swingabletherewith about the arm axis for eifecting rotation of; said element in opposite directions.

32; In a mining apparatus, a frame, an arm pivotally mounted on said frame to swing relative thereto, a kerf cutter pivotally mounted on the outer extremity of said arm to swing relative theretoabout an axis parallel to the armaxis, andmechanism for swinging said relative to said frame and said kerf cutter relative to said arm. including a driving element'rotatable about an axis coincident with the arm pivot'axis, means for connecting said kerf cutter to said element for swing thereby, said means being released during" swinging of said arm, means for locking said element against rotation during arm swing, and gearing carried by said arm and swingable there- Withabout the arm axis for effecting rotation of said element. 7

33. In amining apparatus, a frame, an arm pivotally'mounted' on said frame to swing relative thereto; a kerf cutter pivotally mounted on the outer extremity of said arm to swing relative thereto. about an axis parallel to the arm axis, andzmechanism for swinging said arm relative to said frame and said kerf cutter relative to said arm including a driving element rotatable about anaxis coincident with the arm pivot axis, means for connecting said'kerf cutter to said element for. swingthereby, saidmeans being released during'swing-ing of said arm, means for locking said element against rotation during arm swing, and reversible gearing carried by said arm and swingabletherewith aboutthe arm axis for effecting rotation of said element in oppositedirections;

34. In a apparatus, a wheel supported base adapted to run along a mine trackway, and kerf cutting mechanism mounted on said base including a horizontal arm pivotally mounted on the base and swingable horizontally, a kerf cutter pivotally mounted on the outer extremity of said arm to swing about an axis parallel with the arm pivot axis, said arm being swingable about its pivot relative to said base to position the kerf cutter pivot outside the trackway at either side of the trackway, and mechanism' i'for alternatively swinging said arm relativeto said base and said kerf cutter relative to said'arm and including gearing common to=the. swinging of said arm andkerf cutter and effective to cause alternative swingings thereof and arranged: on said arm at the rear ofthe arm pivot and swing able with said arm during armswing;

35. In a mining apparatusva' wheel supported base adapted to run along a mine trackway; and kerf cutting mechanism mounted'on said baseineluding a horizontal arm pivotally mounted'on said base about a vertical'axis located in advance of said base in front of the'fr'ont'wheelsthereof, a kerf cutter pivotally mounted on the outer extremity of said arm, said arm being swingable horizontally relative to said base to position the kerf cutter pivot outside the trackway at either side of the trackway, and mechanism for'swinging said arm relative to said base and said kerf cutter relative to said arm'including' motor op"- erated kerf cutter andarm swinging devices carried by the rearward ext'remity'of said armat the rear of the arm pivot axis and eifective' to swing either said'arm or said kerf cutter.

36. In a m'inihgapparatus, a wheel supported base adapted to run along a mine trackway, and kerf cutting mechanism mounted on saidfbase including a horizontal arm pivotally mounted on said base to swing about a vertical axis located in advance 'of said base iniront of the front wheels thereof, a kerf cutter plvotally'mounted on the outer extremity of said arm, said arm being swingable horizontally relative to said base to position the kerf cutter pivot outside'the' tracli way at either side of the rackway, and mechanism for swinging said arm relative to'said'b'ase and said kerf cutter relative to said arm including motor operated kerf cutter and arm swinging devices carried by the rearward extremity 'o'f said arm at the rear of the arm pivot axis, said devices including a reverse mechanism for effecting swinging of either said kerf cutter or said arm in either of opposite directions about its respective pivot without reversing said kerf cutter.

37. In a mining apparatus, a wheel supported base adapted to run along a mine trackway, and kerf cutting mechanism mounted on saidba se including a horizontal arm pivotally mounted on said base about a vertical'axis located in advance of said base in front of the front wheels thereof, a-kerf cutter pivotallymounted on the outer extremity of said arm, said armbeing swingable horizontally relative to said base to position the kerf cutter pivot outside the trackway at either sideof the trackway, and mechanism for swinging said arm about its pivot relative to said base and for swinging saidkerf cutter relativeto said arm including a common kerf'cutter swinging and arm swinging gearing carried by the rearward extremity of said arm and effective selectively to cause either arm'orcutters'wmg. I

38. In:a mining apparatus, a wheel supported base adapted to run along a mine trackway, an arm pivotally mounted on the forward end of said base to swinghorizontally relative thereto about a vertical axis located in advance of the front wheels thereof, a kerf cutter pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivotaxis, said arm being swingable horizontally relative to said base to position the 10 kerf cutter pivot outside the trackway at either side of the trackway and to move the kerf cutter in an arcuate path across the end of the trackvvay, and common motor operated devices for swinging said arm and kerf cutter about their respective pivots independently of each other and including means for holding said arm against swinging movement about its pivot during swinging of said kerf cutter.

CORNELIUS G. BOUDETTE. 10

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