US504179A - Oe minim machine - Google Patents

Description

(No Model.) 13 Sheets-Sheet 1. R. STANLEY.

I TUNNEL-ING 0R MINING MACHINE. I

Patented Aug. 29, 1893. I '.1

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3 shets Shcet R. STANLEY. TUNNELING- 0R MINING MACHINE.

Patented Aug. 29

Nrrnn ST TES ATENT. Santos,

TUNNELH NG OR l lilNlNG MAGHINE.

I SPECIFICATION forming part of Letters Patent No. 504,179, dated August 29, 1893.

Application filed September 5,

I To aZZ whom it may concern.-

. many;

- comprising two Be it'known that I, REGINALD STANLEY, a subject of the Queen of Great Britain and Ireland, residing at Nuneaton, in the county of Warwick, England, have invented certain new and useful Improvements in Tunneling or Mining Machines, (which improvements are shown and described in the following Letters' Iatent, to wit: Patent No. 60,237, dated. February'5, 1892, granted to meinGer- No. 3,595, dated February 28, 1890, granted in Great Britain; No. 1,363, dated June 29, 1891, granted in Queensland; No. 5,078, dated July 0, 1891, granted in- New Zealand; No. 3,082, dated June 27, 1891; granted in New South Wales, and No. 37.971, dated December 16, 1891, granted in Canada) of which the following is a specification, ref-'1 erence being had therein to the accompanying drawings.

,In the machine which I have devisedthere are two sets of cutters; a main frame or bed parts, one part for each set of cutters; means for connecting the two parts of said frame; two carriers, one for each of said sets of cutters and adapted to be moved relatively to the bed; a train of cutter actuating gearing ported upon the bed frame and adapted to actuate either of said setsof cutters, .or

-that the two sets of a cut of both simultaneously. Preferably the cutters of each set are arranged to rotate around,

are held by arms se- It is also preferable cutters should be arranged on substantially the same horizontal lines, transverse of-the machine, so that they shall be available for producing a relatively wide out. There are numerous reasonswhy this sort should be of greater-dimensions horizontally than vertically. For instance, in the entries in coal mines,.i t is allowable, and necessary in most veins, to have them from nine to twelve feet wide. In a six cured to their carrier.

- foot vein a single set of cutters of the sort herein described, while .it' may reach from top to bottom of the vein, will not open up 1890. Serial No. 364.060. Ole model.) Patented in England February 28, 1890, No. 5,696; in New South Wales June 27, 1891, No. 3,082; in Queensland Jane 29, 1891', in Canada December 16, 1891, No. 37,971, and in dermnny'Pebr-uary 5,1892, No. 60,237.

Ila-1,363 in New Zealand July 6, 1891, No- 5,078;

more than half or two thirds of the entry horizontally, and another operation by'hand or machine is necessary. It is'desirable to take the material out from the whole entry at one operation. In thesmaller veins the room is so constructed, if a single cutting apparatus is used, that it is impossible to readilymanipulate the machine and get out the cuttings and remove them to points behind the machine. An apparatus of the sort herein provided I can not only work over a larger area of the heading but with it can provide more room for the manipulation of the machine and of the materials removed thereby. Again, whatever be the depth of theme.-

on each part of said frame; "an-4' othertrain of gearingon each part of the'bedchine, or the dimension of the cut made by the machine, it is frequently found that it is necessary to apply hand tools, of the nature of levers, wedges, drills, or the like, for the purpose of removing the central core left by the cutter. By forming two grooves or cuts, either overlapping or independent'ief each other, I'am enabled to apply to greater ad: vantage tools of the sdrt referred tofiand can more easily attach, break down, andremove,

any coal or other-material which may resisttheoperation of the cutters on thegna'ehine, 501. which may be left as the core.

having two sets of more'or less independent cutters, one or which can be thrown out of Another importantadvantage incident to produced by the first cutter can be carried back, and the intervening web can be attached. Therefore there is plenty of room at all. times forgetting at and removing the loos-' ened material. i

It is further preferable that the two sets of cutters should revolve in opposite directions in order that they shall balance each other in respect to the strains and the rc-actionary thrust which they exert upon the machine a generally, and upon the braces or devices by which the bed frame is held stationary during the cutting.

Witlrtunnelirg or mining machines of all I sorts, one of ,the most diliicult problems has been to construct and arrange the parts so that there shouldbe no re-act ionarythrust, either v the parts'A A are substantially duplicates,

in a line directly backward, or toward one side, or the other, horizontally, or upward, or downward. Such thrust, and the disadvena tageous strains incident; thereto, have been.

experienced in using all machines provided with a sin'gle cutter or set of cutters.

Bitely moving cutteraas is herein provided for, I, to a large extent, overcome the dlfilfilllties which have been incident to other machinesfrom this cause. i5 lam aware of the fact that machines have u been heretofore devisedcomprising two sets of oppositely moving chain cutters, mounted do move ,on horizontal lines, and also aware 'rh'at two sets of oppositely reciprocating saw Gutters have been used, in horizontal lines,

and'Ido not claim such mechanisms. ButI believemyself to be first to have arranged {we vertically revolving cutters so as to move oppositely and simultaneously and produce ayksrf of such dimensions that the entire machine can follow ,the cutters."

" The main frame or bed of the machine may be so constructed as to have its two parts permanently united rigidly together, or so as have'them separable ordivisible. Again ----th'e"cwo parts of the main frame may be so joined together by connecting andhra'cing devices that thcyshall be more or less adjustable-in relation to each other, that is ad- 5 jnstable forward and back, laterally and verarmy, and yet have the connecting devices so'arranged that they shall join'the two parts ot he frame with suificient rigidit the one part of Said frame in this case-acting to sup- 4 P t n 'st'eady the other. i i i a The engine or other motor may be so con} i structedandarranged asto; be practicablyin separable'from cit-her of the parts of the bed 't'rame'withouc requiring separation from the 5 other also; or it'may he madei-n two, more 3 orless, independent parts, each capable'of acrtion and each'supported on one of the afore said parts'of the main frame'or bed.

of oneiorm'of cutter head wiihth'e cutters V attachedLRFig. 5 is a plan view of a modified form of, machine. Fig. 6 is a side view and Fig. 7 is a front view'of the machine shown in' Fig. 5.,with the cutters removed. Fig. 8

. shows the clutch for the feed mechanism in Fig.5, 6, and 7. Fig. 9 shows the feed nut Go and the adjacent parts in Figs. 5,6,fand 7. "--F igs. 1O,,11,,i2, 13 and 14: showthe details in cident to the feed nut in the machine shown in Figs. 1 and 2.

The mainframe or bed as shown in the drawings is made up of two parts A A. The

, details of this bed may be of anysort dictated Byfur- IQ nishing' the machine'with two sets of oppo- Icured to the frame.

by preference or circumstances, so long as certain requisites are preserved.

In the mechanism shown in Figs. 1, 2, and

and possess many of thofeatnres of 0011- strnction shown in my earlier patent, No. 414,893, dated November 12, 1889, and referonce may be made to said patent for an .understamlihg of the details of these parts of the frame. I-lere,'it issulficient to remark that each is composed of uprights a a joined at the bottom by sills a and at the top by girders a, together with any additional connecting bars and braces whichmay be found necessary. There are supporting wheels A preferably situated on the central longitudinal plane of each part A A, of the frames; and at the top there are binding screws or jacks AFfor engaging with the roof and for fastcningthe machine firmly in 'position.-

The machineoonsidered as a whole is provided with two independent cutting mechanisms. In respect to these also there may be modifications, as the principle of construction and operation embodied in the mechanism herein can also be applied if other forms of apparatus be used.

That selected for illustration comprises a cut-ter-oarrierof the form of a cross-head or arms l3, secured to a shaft 0. At 13' thereare forwardly extendingarms or barswhich have applied to them cutters or scrapers. The shaftO impartsrotary motion to the cutters. and. also advances them into the material. It is rotated by a train of gearing comprising the wheel D, pinion D,

en a in therewith, wheel D and inion D 2.- qo p The pinion D and wheel 'D are on a counter shaft E which is driven from the engine shaft E by said pinion D. The shaft 0 and wheel D are connected by groove and feather or in some equivalent; way, so that the former can advance while rotating.

G indicates gen-- erally the engine connected to the shaft F, it

and its connection heingof any suitablesort. The mechanism for advancing the shaft C,

,may also be of any of several well known Asshown it consists of a nut'd, held. in place upon the bed firammand having teeth. fformcd either integral with or separately from the-threaded portionya gear wheel d engaga sorts.

ing with said toothed nut d; and a spurwhecl d on the crank shaft- Fadapted to" be engaged with the last said wheel d. d is' a plate having apertures th'rou h which pass, the shafts Rand F of the whee sdi'df. flThis plate (i can be caused to move toward and from the nut wheel'at d. I a screw rod d, having. a hand wheel d and engaging with a not at d The shaft F is It is so moved by secured to and projects from the plate a, Se 7 Whennhe nut isito be held stationary so that the cutters will advance relatively to the frame, a bolt or looking device at d is used to fasten the nut in place, and at such time the plate (1 is forced forward by the screw d, and tho plateliar- .ro revolve, and from ries the wheels d" d away from the wheel d. When, on the other hand, the frame is to be advanced relatively to the cutters, the belt.

Ill

1 rigidly secured to said parts A A or loosely.

If a loose connection is employed it may be of such sort that.various adjustments can be attained. As shown in Figs. 1, 2 and 3 these connecting parts at 1-1 are each formed of two oppositely threaded bars or rods 7L h joined by a central sleeve it having threaded ends to engage with the rods h h. At the ends of bars h h there are ball and socket joints hh by which they are connected to the parts A A. of the bed. Of these devices I'I there may be as many as occasion requires. Preferably I use two at the front end and two at the rear, and arrange those of each part so that they cross each other, that is to say so that each one engages with the top of one of the parts of the bed frame, and with the bottom of the other. It will be seen that by means of such devices the parts of the bed can be braced in any ordinary way desired. It, for any rea- 5 son, it is desirable that either part of the frame should be slightlyin advance or in rear of the other parts, this can be provided for when the parts are constructed and arranged as shown, as there is more or less forward and back movement permitted when the intel-mediate brace-rods are loosened, because of the loose connection of said rods. Again,

by having the main frame divisible longitudinally into two sections, the machine can 5 be manipulated much more readily as concerns getting it to or from the places of working. These machines are necessarily heavy in order to have them sufliciently strong to withstand the severe strain exerted upon them; and as the tunnels which they form approximate so closely the through dimensions of the machine, there is trouble and inconvenience incident to the handling of them.

' When made as described above, they can'be '55 adjusted or moved in parts and yet without dismantling them' materially. Another important end at whichl aim can be attained under this construction and arrangement;

though itis not'l-imited thereto, namely, the provision for euttinga wider or narrower tunnel as may be desired. I provide for this by having the two cutter carriers, which are here of the form of two longitudinally-arranged shafts, so arranged that they and their bearings can be laterally adjusted toward and from'each other. Y It is the work of but few moments .to change the machine so as to connecting the secondary shaft of. one enform a narrower heading if the nature of the material demands it, orawider one if circum stances permit.

The cutter heads or carriers B of the two cutting mechanisms of the machine'can be I arrangedv so as to alternate with each other in their rotation, that is so that one will be-in vertical position at the time the other is in horizontal, or they can work together, that is, be in vertical positions and horizontal positions at thesame time. Butin either case the two sets of cutters revolve in opposite directions, by preference, so that they will throw the cutting and dbris to the outer sides of the machine. If they rotated in the-same. direction, more or less of the cuttings and dbris would be delivered on the centrallon; gitudinal line of the machine. By delivering them at -the outer sides they can be easily reached for removal to the rear of the machine.

In order to have the two sets of shatring and gearing workin proper relation to eactrg'o" other, I connect them together positively by suitable devices, such as "a cross shaft andgearing or sprocket chain gearing, or equivalent: In Figs. 1, 2, and 3 a sprocket chain is shown, it connecting two sprocket wheels I 5 1 one n each of the side parts A A of the frame and preferably secured to proper shafts. As shown','these chain wheels are connected to the shafts through the medium of the gear wheels d d, to which they are respectively connected by bolts or pins i passing through apertures in the chain wheels, as illustrated in Figs. 2 and 13. Whenever desired, either or :both bolts or pins can be removed sd that the two parts of the machine, will be indepehdent of the other; or one or more clutches of the ordinary sort such as is shown in my previous patent No. 414,893 can be used. The

chain is shown inFig- 2, by dotted lines as ginejwith the crank shaft of the other, and by irieans of full lines it is shown connected withthe secondary shaft of, the other engine. When motionof both cutters in the same direction is desired the chain will be placediri one or other of thesepo'sitions, and when opposite movements are wanted, the other position can be used. By means of the above described connecting bars. or rods 11 H one part of the bed or main frame serves to I20 strengthen, steadyand keep upright the other.

The sleeve nuts 71. can be turned by wrenches so as to, lengthen or shorten the connecting bars ll to make the connection perfectly rigid. If the binding or jack screws A be loosened, the upper parts of the frame can be moved out or in as may be desired by the connecting rods ll. When twocutt-ingmechanisms and a two-part-frame are thus employed, a machine is provided which is much more rigid than when a singlecutting apparat us and bed are used, and one which is adapted to stand much moreadvantageously the working of the arms and cutters. Byhaving ihe lmndn.

- he lzing-gonlii'il or nearly as sulphur and present the dos. ernlor t1 nor ore.

*ihed fen-lures: allowing lotinetznent, the Width "ntod are (lei-aired.

.i twonntlingineoin nniisinn so alonetogether not their onto ohm/ll.

eo, and little or no If the two sets of rib is left between them.

cutters nro nrrnng'ed to alternate in their rotation nlmvodeeerihed, they can he brought [still closer iogeiher an opening formed ncroos the entire heading more or less coinplele.

By eonpling togellier by chains or otherwise, theehefting and engines of the two ei'cleeofi the machine the engines are oensed to help one another, even when both eels of after there will he a tunnel with continuous top and bottom adapted to serve as an entry or passage-Way.

In Figs. 5, (Lend 7 there is shown a inodi'- fied machine, though the general principles 'of operation and features of construction are preserved. In this case, the connecting devices H H which join the side sections A A, of the bed or main frame are rigidly secured thereto,nndn'e preferably pinned horizon.- telly and may be utilized to enpport other ports of the machine. two sets of editors, tr'ro trains of ou'tter actuating gearing,

cotter carriers, two and two sets of feed devices. But the powershni't 'ie arranged 'troneverseiy oihfihe machine and time but a single engine is necessary it haw ing two cylinders, live, and two pistons con nected to the single power shaft. The engine is here hrong'ht down lower, and er tinged horizontally, and the engine frame I be utilized as part of the cross connection be, tween the two side parts A A! of the-bed.

On each side of the machine there is acut ter actuating gearing comprising the wheel I) on the cutter carrier shell; (1, e pinion D on counter shaft E, wheel I) also on the counter shaft, and pinion D and wheel D on a short intermediate shafl3-E. D is n double bevel Wheel on the crank ehaft and is'adnpted to slide thereon, it having a lever J for moving it. When wheel D is in engagement with wheel D the engine and power shaft will to tote" the euttere. The'feed not all is rotated hy the shaft lilhnving a, beveled Wheel in; and

a pinion L, which engeges with n. wheelllon a short shaft 3 below the carrier eiieit 0 end "pert of the mill meeting the tion, the nuts Will he in this ease there are work one having it wheel M which engegos the toothed lly moons of lever ,l',rtl1e wheel D can he moved out of engagement with. Wheel if) to nenireil poeitioi'nlori'nio e i- 'einent with the nioreeeid bevel Wheel l'Viien in engngementwitli the letter, the not cl is caused to revolve.

The mom er of using; the feed mechanism will be red in understood. When the outliers ore in he edvenced relatively to the hedthe latter li-l fastened firmly in piece by the jack sci-en's A", or any other suitable deviooeoclnpn ed to engage with the while ol the tunnel, end it is held etntionnry until the out in eoinpleted. fit N, N, there one hinged jncire or hrnccn near the control longitudinal line of the machine which when engaging With ftho bottom of the tunnel resist-any reaction or beck thrust and oesiet in holding'ihe machine to its worlr. After rnnced thedesired distance, either after or before the cores have beonlnken out and removed, the bed or main frame can be advnnoed on .to the onliiere, ores nemayhe desired, as follows: The jeolr screws 1A to: gether with any other fastening devices are released, an that-the bed in free. Suitable means for :t'eetening then applied, such for ine once, as those shown the cotter cnrriere ore the colt-ere have been nil-1 in my eforesnid Potent No. M4393. Then.

the bevel wheels I) are moved into engngc ment with wheels 1 1.- nnd the nn teere unlocked, whereupon, the engine being; in n10- rotntcd in enoh way as to csunelho bed to advance, it moving forward on,the Wheels AF. After it has reached the desired point it is egeinlnstoned in place and the orto are rendy foi'miothoronlo ,flhe frame in virtnnlly carried upon rfedjnstnhlo pivot-line enpporte the iront'end, rind has, [in the wheels nnd the portal ment around the ones of the solid pivotnlenn ports; and in reopeoltn these pnrtsth'one ma PJQJHOIQ or lose vol-lotion, so longnsthe essential matters of conelrnction and operation are preeerrcdi I do not olninr herein, any oi lliosnhject my oppiiinnttere not forth in the claims of cation, flerinl lilo. 398,690, 'liied July wherein nrneehine is shown sin'iilnr to that in Figs. 5 ond'ti herein. i prefer to claim herein oil novel mentors common to both ninchines,

cloiining; in eniil othereeeo the illustrated in Fine, 5 end (in 1. In at tn'nnoling or mining mnehine the combination with e iced frame of tWoinde pendenteete of cutters, an engine on sold bed, and moons for connecting the said (illiilfilffi in dependently of each other with the held on gine and disconnecting eten'tinily no set forth.

il. in tunneling or mining machine the novel features incident therein) n'tthe rear end, means for verliicnlndjt stei them therefrom, only conihinntion of two indepentlenleete of cn'ti the land or main lirenie, the

pendent cutter ntrriers. nionnted noon eeid two ingle i bed, the two independent trains of gearing for advancing the said cutter carriers and means substantially as set forth for rotating said cutters, substantially as described.

In a tunneling or mining machine the combination of the two independent sets of cutters, the bed or mainframe, two inde-' pendent cutter carriers mounted upon the said bed, two independent. trains of gearing for rotating the sait. two cutter carriers, and means substantially as set forth for moving the cutter carriers relatively to. the bed, as described.

4. In a tunneling. or mining machine the combination of two independent sets of cutters, twoadvaneing and reccding'carriers for said sets of cutters, respectively, a bed frame comprising two parts each of wh? '11 supports one of the aforesaid carriers, a train of cutteractuating gear on each of said parts of the bed, a train of cutter advancing gear on each part of said bed, and an engine on each part of said bed adapted to'beindcpendent of that on the other part, substantially as set forth.

5. In a tunneling or mining machine the combination of the two independent sets of cutters, the two independent cutter carriers, the two independent sets of cutter-actuating gears, and the bed or main frame formed in two parts, each part having secured to itone of the said cutter carriers and trainsof gearing, and adjustable connecting bars orbraces for joining the two parts of the said bed or main frame, substantially as set forth.

6. In atunnclingmachine,thc combination of amain frame or bed, an engine or driving .mechanism, cutter-rotating gearing, two sets of independently rotating tnnnelforming cutters, and cutter carriers which are adj ustable laterally toward and from each other whereby the width of the out can'bc modified,

' substantially as set forth.

7. In a tunneling or mining machine the combination of the two adjacent sets of independent cutters which form two horizontal cylindrical kcrfs, the cutter carriers, and the main frame having the two parts or sections respectively supportingthe said cutter car-- riers, said. sections of the bed, and said outter carriers being adapted to pass into the said kerfs, means substantially as described for connecting together the two parts of the bed or frame which support the cutter carriers, t-wo indepcinlcntly acting cutter actuating mechanisms on said frame sections, ro spectively, and two independently acting outter-advancing mechanisms on said frame-sections, respectively, substantially as set forth.

8. In a tunneling or mining machine, the combination of the two sets of cutters, the separate cutter carriers, and the bed frame which supports the said carriers and cutters formed of two parts adapted to be adj ustably connected together, snbstantiallyas set forth, whereby one can be moved longitudinally forward or back. r-' 'l.-tti\'ely to the other, as described.

'which supports gine's [or driving the said 9. In a tunneling or mining machine, the combination of the two sets of cutters, the separate cutter carriers, and the bed frame and said cutter carriers formed in two parts adapted to be adjustably connected together, at their upper-parts as described.

10. In a tunneling or mining niachine,the combination of the twosets of cutters, the separate cutter carriers, and the bed frame which supports the said cutters and cutter carriers, and formed in two parts adapted to be adjustably connected together at the bottom substantially as sct forth, whereby the bottom parts thereof can be placed. farther apart or closer together, as described.

11. In a tunneling or mining machinethe combination -with the two independent sets of cutters; the two carriers for said sets. of cutters, the two sets of gearing for rotating said carriers, the two sets of gearing for advancing said carriers, the independent en-v sets of cutters, and the frame or bed connected to both the said cutter carriers and having two parts adjustable in relation to each other, substantially as set forth. I

12. In a tunneling or mining machine, the combination with the bed or main frame, of two cutter carriers thereon adapted to ad-' vance and recede relatively to the bed and mounted in substantially the samehorizontal plane, two sets of cutters supported by both the said sets of cutters the said carriers and arranged to form two horizontal cylindrical kerfs, ad j acent to each other, of such dimensions as to adapt them to receive the entire machine, and two independently acting cutter-rotating mechanisms as described.

13. In a tunneling machine, the combina tion of two tunnel-forming cutters, two outter-carriers, two setsof cutter-rotatin g devices,

two engines or motors, a bed or frame which supports all of the aforesaid parts and is divisible centrally and longitudinally intotwo main parts, each part supporting a cutter, a

cutter-rotating'mechanism and an engine, and

two sets of cutter-advancing devices, one oneaclr of said parts of the main frame, whereby the cutters are moved,forward, while the hedis stationary, substantially as set forth.

,ll. In a tunneling or mining machine, the combination of the bed or main frame two independent sets of cutters adapted to advance relatively to the main frame, the engine, and the two trains of gearing for rotating the two sets of cutters respectively, and two adjustable connecting mechanisms for throwing one or both of the said trains of cutter actuating gearing out of connection with the engine, substantially as set forth.

15. In a tunneling machine, the coinbination of two tunnel-forming cutters, two cutter-carriers,twosetsof cutter-rotating devices, two engines or motors, a bed or frame which supports all of the aforesaid parts and is low gitudinally separable from top to bottom. in

16. The combination of the cutters, the

threaded feed shaft, the rotatable nut, the two sliding, intermeshing, continuously rotating, gear wheels connected to the power shaft for driving the nut, and means for sliding them together, into and out of the operative position substantially as set forth.

17. The combination of the cutter, the threaded feed shaft, the rotatable nut, the intermeshing wheels for rotating said nut, a plate for securing said wheels in permanent relation to each other, and a threaded rod ongaging with said plate for shifting said wheels, substantially set forth.

18. The combination of the cutters, the threaded feed-shaft, the rotatable nut, the two sliding, inter-meshing, continnonsly-rotating gear wheels for driving the nut, means for lockin g the nut against rotation, the threaded shaft for sliding the said wheels, and the sliding power-transmitting chain-wheel. detachably connected to the said gear-wheels, substantially as set forth.

19. The combination of two indeperdent cutters, two trains of cutter-driving gearing, two engines connected respectively to said trains of gearing, the chain for transmitting power from one train of gearing to the other, and means for disconnecting the chain from either or both of said trains of gearing, substantially as set forth.

20. lhc combination of the main frame or bed, the two cuttingmechanisms respectively supported upon, the side parts of the said frame or bed, the two independcnt sets of cutter-actuating devices respectively arranged at the sides of the bed, the transvcrsclyan set forth,

21. In a machincfor forming two adjacent 'or intersecting tunnels of a height greater than that of the machine, the combination of a main frame extending from the center of one, to the ccnterof the otherof said tunnels, means for holdinsaid frame stationar y, two tunnel forming cutters in front of the main frame and rotating in planes transverse to the axes of the tun ncls, and .tdval'icing when i at work relatively to the frame, the engine on said frame, mechanism driven by the engine for advancing the cutters, and mechanism for rotating them, the said parts being arranged substantially as described, whereby the cut tors while advancing from the frame are mutually relieved from reactionary and side thrust, as set forth.

In a machine for forming two adjacent or ,irtcrsecting tunnels, the combination of the main frame, the clamping d,c\ ices for sccuring the frame stattonarily in place, the two sets of cutters, detachnbly connected to the engine the two cuttcrcarricrs advancing lon gitudinally relatively to the main frame, the gearing for rotating-the said cuttcrs,the gearing for advancing them, and the power-shaft and the engine both sccu red to the .maiu frame, and situated between the said cutter carriers, substantially asset forth.

23. In a tunneling or mining machine, the

combination of't'he two independent cutters,

combination of two screw shafts, two sets of cutters carried thereby,indepeudentbcarings for said screw shafts, a main frame holding said bearings rigidly in relation to each other, and twoindependent sets of gearing supported on said frame for driving said cutters, sub stantially as set forth. V

25. In a tunneling or mining machine, the combination of the two cutters, the frame be' hind the cutters, the two parallel cutter carriers on said frame, the engine, and the powershaft situated between the cutter carriers and detachably connected to either or both the cutter carriers, substantially as set forth.

26. Ina tunneling or mining machine, the combination of two independent sets of cutters, a bed frame supportingthe said cutters permanently in the same relations to each other, an engine on said bed, two independent trains of gear foradvancing the bed,and means substantially as set forth for connecting the engine therewith.

27. In a tunneling or mining machine, the combination of the two cutters, the main, frame, the two cutter carriers, the two intcrmediate shafts respectively between said power shaft and thc'cuttcr carriers, and both driven by said powcr-shaft, and two clutches for disconnecting the cutter carriers from the power shaft ind pendently,substantially as sctforth.

28. The comlf ati of two independent;

,cuttcrs, the two cutter carriers, the main frame, the transverse power-shaft and the iongitudinal intermediate shafts both driven by the power shaft, substantially as set forth.

2!). In a tunneling or mining machine, the combination of the bed or 1naiuframc,thc engine mounted thereon, the two cutters or sets of cutters, and the two clutches, whereby the engine can be connected with both of the cutters or either one separately, substantially as set forth.

l The combination with the two independent cutting mechanisms and the two indcpendent trains of cutter actuating gearing, of the power shaft the engine, and two clutches respectively interposed bctwct .1 the said "pews-r shaft and the trains of actuating gear- Eng, substantiaily as set forth.

31. .113 a Qunueling 0 r mining machine, the ssmbinmiouof the two independent cutter powershaft intermitting1y connected to eithec or 00th of the said trains of winter actuating gearing, substantiaily as set forth.

In testimony whereof 1mm; mysignaturs in mechanisms, the main frame or bed having the presence of two witnesses.

the side parts respectively supporting the cutting? mechanisms and the connecting Gevzces rigidly secured to the said side parts, me two trains of gearing for driving the said cutting mschanisms, respetively, and the REGlN'ALD STANLEY,

W'itnssses:

F. RAYMOND BURTON; ERNEST HARKER.

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