US1284398A

US1284398A - Tunneling-machine.

Info

Publication number: US1284398A
Application number: US22713218A
Authority: US
Inventors: Edward S Mckinlay
Original assignee: Individual
Current assignee: Individual
Priority date: 1918-04-06
Filing date: 1918-04-06
Publication date: 1918-11-12
Anticipated expiration: 1935-11-12

Description

E. S. MCKINL'AY.

TUNNELING MACHINE.

APPUCATON FILED OCT' 29,1910- RENEWED APR- 6 1918: 1,284,398. Patented Nov. 12,1918.

4 SHEETS-SHEET I.

E. S. IVCKINLAY.

TUNNELING MACHINE.

APPLICATION FILED 00129, 1910. III-:NEwED APR. 6, IsIa.

Patent-ed Nov. 12, 1918.

4 SHEETS-SHEET 3.

o0] o ///7 /f/Q/ ,WI W

n #//MMMM E. S. lVIcKINLAY.

TUNNELING MACHINE.

APPLICATION FILED OCT. 29, i910. RENEWED APR. 6, 19H?.

' Patented Nov. 12, 1918.

4 SHEETS-SHEET 4.

wit/naman t; a# cierra EDWARD S. MOKINLY, 0F OAK CREEK, COLORADO.

TUN N ELING-MACHINE.

Specification of Letters Patent.

Patented Nov. l2, i918.

Application filed October 29, 1910, Serial No. 589,807. Renewed April G, 1918. Serial No. 227,132.

To all whom t may concern.'

Be it known that I, EDWARD S. MCKIN- LAY, a native-born citizen of the United States, residing at Oak Creek, in the county of Routt and State of Colorado, have invented certain new and useful Improvements in Tunneling-Machines, of which the following is. a specification, reference being had therein to the accompanying drawing.

This invention relates to improvements in tunneling machines and is especially adapted for rock work. With certain modiiications, however, it is adapted to be used in driving entries in coal mines and for other similar urposes. l

One o ject of theinvention is to provide a light, easily moved machine with improved supporting means. Another object is to provide improved means for rotating the cutter head. A further object is to provide means for softening and cracking the rock at points adjacent tothe cutting tools. Still further objects are -to provide improved feeding means, improved means for advancing the supporting parts, and improved means for carrying the loosened material backward away from the cutter-head. Other objects will be 'apparent from the following specification and claims. l

In the accompanying drawings forming a part of this application l have shown, for the purpose of illustration, oneform of mechanism embodying my invention. lt

`will be understood however that many changes and modifications may be made in the construction shown without departing from the spirit of my invention.

Of the drawings,

Figure l is a cross sectional elevation showing the machine in operative position in a tunnel, a part of the mechanism is broken away in order to more clearly show the construction.

Fig. 2 is an enlarged detail view showing partly in cross section the construction of one of the radial arms and attached mers.

Fig. 3 is a fragmentary plan View shewing an arm at right angles to the arm shown in Fig. 2.

Fig. 4 is a cross sectional view taken along the line 1*4 of Fig. 1.

Fig. 5 is a. fragmentary cross sectional detail view of the advance supplemental cutter and adjacent bearing.

Fig. 6 is an end View of the supplementary cutter.

Fig.- 7 is a fragmentary cross sectional view taken along the line 7 7 of Fig. l, showing one of the elevating scoops.

Fig. 8 is a detail view showing one of the pipe connections.

Referring to the drawings, l represents the main supporting tube upon which the other parts of the machine are mounted. As shown in Fig. 2, this tube comprises in the present form of mechanism, two sep arate parts l@ and lb. It will be understood, however, that if preferred these two parts may be made integral. 2 represents a central connecting casting or hub to which are secured the adjacent ends of the tube parts la and l". The hub 2 is hollow and the chamber 3 within it communicates :freely lwith the interior of the tube part 1b. rl`he chamber 3 however is separated from the interior of the tube part 1a by means of a wall 4.

The tube 1 is supported in two bearings 5 and 6. The rear bearing 6 is pivotally secured by means of trunnions 7, 7, and brackets 8 to the frame 9 which comprises two parallel vertical side bars l0, l0 carrying the

brackets

8, 8, and horizontal cross bars 1l, l1, at the ends of the side bars. Screw jacks l2, 12, are secured to the horizontal cross bars and may be adjusted to engage with the top and bottom oi' the tunnel. ln this way the frame 9 is secured in positicn but is at the same time adapted for rapid adieustment or for ready release when it is desired to move it. p

The forward end 0f the tube l is provided with a series of cutters 13, which are suitably arranged to cut a circular holein the Aiorward face of the tunnel opening.

'l'he forward end of the tube is Open and the material which is loosened b v the cutters 13 will enter its open end where it will be engaged by a helical rib l-t termed on the inner surface of the tube. rl`his helical rib serves as a spiral conveyer to carry materials backward as the tube is rotated. Holes 15, 15, are provided in the tube from which the material mav be discharged. ward bearing ,.3 is provided with an outer non-rotating' casing ltwhich is secured against relative longitudinal movement by collars 1T and .1S on the tube 1. Vithin the casing 1U is located a series of rollers 19 which are adapted to bear against the outer .surface of the. Jtube and against the inner surface of the easing. As the machine is advanced the bearing casing 16 enters the aperture formed by the cutters 13 and is held against rotation b v frictional engagement with the sides ot the opening. lt thusl serves as a bearing box in which the rollers 19 operate.

rlhe main cutter-head is indicated as a whole by 20. rilhis cutter head preferably comprises a series of radial arms. 1n the drawings for purposes of illustration, I have shown four of these arms located at right angles to each other and designated QQ. QQ, and 23, Q3. lt will be understood. however, that other numbers of arms, such as six or eight, may be used if deemed desirable.

l. at present, prefer to construct the arms Q2. QQ. and '28, of pipes, the inner ends of which are screwed or otherwise secured to the cent-ral hub. For reasons which will be fully explained hereinafter, each of the four radial arms is composed of two separate telescoping sections such as are indicated in Fig. Q, by Qi and rlhe section which is secured to the hub is preferably the larger and communicates at its inner end with the chamber The section 2i is slidable within the section 25 and is closed at its outer end by means of a cap Q6. The section 25 is preferably provided with an internal key-way which is engaged by a key QT secured to the pipe section 2i. This key and key-way prevents rotary movement of the section 2t relative to the section 25. A split clam) QS is secured to the end of the section Q5 and frictionally engages the section Qt. This clamp may be tightened by means of a screw 29. l have described in detail but one of the. radial arms, but it will be understood that the foregoing description is equally applicable to all ot the arms es. es, es.

vliach alternate radial arm (in this case 22. carries a plurality of approximately equally spaced cutting" or rock engaging tools which are j ably of the reciprocatory type and whi Y. may be operated by rThe forj compressed air, although if desired other mediums, such as steam may be used. ln the drawings for the purposes of illustration, l have shownthree of these tools on each arm 22, one of which 30, is secured to the inner section 25, and two of which 3l and 3Q are secured to the outer section 24. yhe tool 30 is formed with a bracket 33 which embraces the section-'25 and may be frictionally clamped against it by means of a bolt 34. The tools 31 and 3Q are also formed in

similar brackets

35 and 36 which similarly engage the .section 24. By this means the tools are adjustably secured to the arms so that they may be moved not only radially but also angularly relatively to the plane ofthe cutter-head and rela tively to the lines of rotary movement. On each arm between the arms carrying the

tools

30, 31 and 32, (in this case 23, 23) are located other reciprocatory rock engaging air operated

tools

37, 38 and 39, preferably somewhat larger and hea-vier than the

tools

30, 31 and They are secured to the arms 23 by means of clamping brackets similar to those previously described and by means of which they can be angularly and radially adjusted. lt will be noted that the tools ST'and 38 are secured to the section Q5 and that the tool 39 is secured to the section 2i. 1t will be noted from a reference to the drawings that the

tools

30, 31 and 32 are adjusted and located for the cutting7 as the cutter-head is rotated, of three approximately equally spaced

annular grooves

40, 41 and 42.

rEhe tools

37, 38 and 39 are positioned to strike the ridges formed between the grooves and between the inner grooves and the circular aperture cut. by the, tools 13. The function of these heavier tools 3T, 3S and 39 is therefore to crack and break down the coal or rock left between the grooves cut by the other tools. j

lt will also be noted that each of the tools is positioned at an acute angle to the for ward face of the tunnel so that oblique blows are struck. T he re-action from these angular blows serves to rotate the machine. The speed and powerof rotation may be regulated by adjusting the angularity of the hammers. j

lt is to be noted that the machine may be adjusted for cutting a tunnel of any desired diameter. This is accomplished by changing the position of the telescoping arm sections Qsi. After the sections have been properly located, further adjustment of the hammers may be had by means of the brackets on which they are mounted.

fis an additional means for rotating the machine l provide supplemental reciprocatory cutting tools d3. 43, at the outer ends of some of the arms. ln this ease 'they are shown at the ends of the arms "227 and are secured to suitable brackets formed on the caps 26. These

tools

43, 43, are adapted to strike blows at acute angles relative to their lines of rotary movement and therefore to strike the circular surface of the tunnel with oblique blows the re-action from which aids in giving rotary motion to the cutter-head.

From the foregoing description it. will be seen that for rotating thel apparatus I make use of all of the cutting tools, namely,

at 30, 3l and 32, those at 37, 38 and 39, and

those at 43. Each of these tools is mounted to strike the Wall of the tunnel at an acute angle relative to the wallv and to the line of rotary movement of the tool itself.` ln other words, each tool, whether acting on the flat forward face or on the cylindrical peripheral face, delivers blowsy at backward acute angles thus tending by the reaction to rotate the cutter-head.

Any desired means may be used for supplying air to the cutting tools, but the means which l at present prefer, is shown in Fig. 2. As has been previously stated the hub 2 is formed with a central chamber 3 which communicates with the interior of the tube section l".

Each of the

hollow arms

22, 22, and 23, 23, communicates at its inner end with this central chamber 3 in the hub 2. By supplying air under pressure through the tube section lb a pressure is maintained in all of the hollow arms. By means of flexible piping indicated by 44, 45, and 46, air is led to the

tools

31, 32 and 43. By means of the flexible pipe 4T air 'is led to the tool 30 directly from the chamber 3. By a similar system of piping the

tools

37, 38 and 39 are supplied with air.

Referring now to the means for advancing the cutter-head as the tools operate, 48 is a hollow cylinder secured to the bearing 6. The tube l is not only rotatable in the bearing 6, but is also slidable there through. By reference to Fig. l, it will be noted that the tube 1 is somewhat smaller in diameter than 'the interior of the cylinder 48 and that it is provided with a head 49 adapted to engage the interior of the cylinder 48. Adjacent the head 49 is a non-rotating piston 50 also slidable in the cylinder 48. The head 49 and the piston 50 are provided with central alined apertures 5l and 52 which establish communication between the interior of the cylinder and the interior of the tube. iir pressure is supplied to the cylinder through a pipe 53. The pressure of the air in the cylinder 48 is exerted against the piston 56 from which it is transmitted through vthe head 49 and the tube l to the cutter-head and serves to hold the cutting tools up to their work. The air presurc is also transmitted through the apertures 5l and and through the tube sect-ion il to the chamber 3 5 0 has been forced to the end of its travel in the cylinder 48, it then becomes necessary to advance the cylinder and the bearing 6. This is done by closing the valve 53 and relieving the pressure within the piston 48 through a cock 56. The jack-screws l2, l2, are loosened so that the whole rear end of the machine is free and then air is admitted to the space 55 by opening the valve 54. The pressure ot' the space 55 then forces the bearing 6 with the framework 9 and also the cylinder 48, to positions close to the cutterhead. lhen this has been done and the valve 54 has been closed, the acks 12, l2, are again tightened and when the valve 53'CL is opened the machine is ready for operation as before.

ln order to remove the debris loosened by the various cutters, I provide a conveyer preferably of the endless belt type and indicated as a whole by 5T. As shown in the drawings this conveyer comprises two horizontal parallel side bars 58, 58, at the ends of which are mounted rollers or

drums

59 and 60, over which passes the endless belt 61. The side bars 58, 58. are supported at their forward ends by depending arms 62, the upper ends of which are secured to a collar 63 which loosely engages the tube section l, and .is held against relative longitudinal movement by means of engagement at its forward side with the hub 2, and at its rear side with a collar 64. The rear ends of the side bars 58 are supported by and slidably engage with depending brackets 65 mounted on the cylinder 48.

66 is a shaft parallel and above one of the side bars 58 and is rotatably mounted in suitable bearings. The shaft 66 is operatively connected with the 'drum 6() by means of skew gearing 6T.

An air motor indicated by 68 is secured to `one of the side bars l0 of the framework 9.

Air is led to this motor through the pipe 69. lower is transmitted from the motor to the shaft 66 b v means of the bevel gearing 70, the vertical shaft Tl. the bevel gear T2 and the bevel gear T3. The gear 73 is adapted to permit th(` shaft 66 to-slide through it, engagement being had with the shaft by means of a key i4 which slides in a longitudinal keyuvalv formed in the shaft.

.it the ends of some of the arms (in this case 23. 23) are provided scoops T5 which are providei'i with forward extensions 'T6 which. act. as scrapers to work material backward into the plane of action of the scoops. ks shown in Fig. i", the scoops are adapted to pick up material from the bot-tom of the tunnel and as they are carried around to deposit. this material n the conveyer 57. A car 7T may be provided to receive the material from the rear end of the conveyer.

For operation on certain classes of rock, I provide supplemental means adapted to cooperate with the cutting tool and to soften and disintegrate the rock. Broadly considered these supplemental devices comprise means for heating the rock to a high temperature. I have found thatlcertain classes of rock are very materially softened when subjected to heat. It hasalso been found desirable in certain cases to rapidly cool the heated rock in order to break it up and disintegrate it. This cooling mav be preferably accomplished by a jet of Water, though in some cases under certain peculiar conditions a chemical such as a weak acid solution may be used instead of pure Water. lVhen a chemical solution is used the effect is not only to break the rock on account of the stone contraction, but the liquid also percolates through the interstices of the fractured rock and further destroys it by chemical reaction.

In the drawings I have shown for the purposes of illustration one form of apparatus for accomplishing the results above set forth. This apparatus comprises a means for directing against the rock burning gases such as hydrocarbon and oxygen or acetylene and oxygen. It will be found preferable however, in some cases to use electric apparatus for supplying the heat. 'I he burners are indicated in the drawings by 78, one being provided in advance of ea ch 0f the

cutting tools

30, 3l, and 32, and secured to it by means ofa bracket 0r arm 79. 80 represents a nozzle for supplying a jet of water or other cooling medium against the rock at a point between the point of connection of the burner 78 and the cutting tool.

In the drawings have shown one means for supplying gases and liquids to the burners and jets 78 and 80. In each of the arms are located three

pipes

8l, 82 and 83. rllhese pipes are each made in two sections which telescopicaily'engage to permit adjustment of the section of the arm. The pipes 32 and 8B carry the gases and pass out through the cap and connected by means of tiexible ipe Satto the burners. The gases ier burners on the tools l DU hrough pipes 35 the interior mi, 1, p) fr. lrv a a stuiing box in the rear messes 81 is led to the youter nozzles by means of flexible tubing- 90. 'I he Water for the nozzle on the tool 30 is led through a flexible tube 91 from the interior of the chamber 3. rIhe pipes 81 and 91 are supplied through a pipe 92 which extends backward through the opening between the

tanks

86 and 87, through apertures l and 52 and through end ot' the cylinder 4S. T his pipe is made in two parts connected by a union 93 which permits the forward part to turn and the rear part to remain stationary.

In view of the foregoing description it is thought that further detailed reference to the operation will not be necessary. It may be well however to briefly call attention to certain advantageous features. First, it Will be noted that the machine is entirely selfcontained, and that n0 cumbersome and eX- pensive supporting framework or trackway is used. vice is provided for giving rotary motion to the cutter-head, this motion being obtained from the oblique blows of the hammers themselves. The machine is adjustable for various diameters of tunnels and a simple means is provided for feeding the machine forward and also for advancing the rear bearings from time to time. The foregoing are some of the more important advantages incident to my machine but others will be apparent from the following claims.

What I claim is:

l. In a tunneling machine, the combination of a cutting mechanism, rear supports for the cutting mechanism with respectl to which the said mechanism is bodily movable longitudinally, the said rear support engaging the wallsl of the tunnel formed by the cutting mechanism and being provided with means arranged to permit pivotal movemeut about a horizontal axis and about a vertical axis. and a forward support for the cutting mechanism bodily movable therewith and adapted to engage theforward face of the tunnel, substantially as set forth.

2. In a tunneling machine, the combination of a. cutting mechanism, rear supports for the cutting mechanism with respect to which the said mechanism is bodily movable longitudinally. the said rear support enaging the walls of the tunnel for d t' i echanism and bei",y

permit pi i And furthermore no separate de,

3. In a. tunneling machine, the combination of ay cutting` mechanism, a support for the cutting mechanism in advance thereof and having a non-rotary part, a support for the cutting mechanism in the rear thereof with respect to which it is bodily movable longitudinally, a frame provided with means for pivotally engaging diametrically opposite walls of the tunnel formed by the cutting mechanism, and a connection between the said rear support and the said frame permitting relative pivotal movement about an axis at right anglesy to the axis of pivotal engagement of the frame with the tunnel walls, substantially as set forth.

4. In a tunneling machine, the combination of a rotary cutting mechanism, a

rotary shaft on which the cutting mechanism is mounted, two supporting bearings for the shaft, each having a non-rotary. part, one of the bearings being in advance of the cutting mechanism and the other of the' bearings with respect to whichthe shaftis longitudinally movable being at the rear of the cutting mechanism, a supporting frame for the rear bearing, the said frame being adapted to pivotally engage the walls of the, tunnellformed bythe cutting mechanism at diametrically opposite points, and a connection between the said rear bearing and the said supporting frame adapted to permit relative pivotal movement about an axis at right angles to the axis of pivotal engagement of the supporting frame with the tunnel walls, substantially as set forth.

5. In a tunneling machine, the combination of a rotary cutting mechanism, a rotary shaft on which the cutting mechanism is mounted, two bearings for the shaft each having a non-rotary part, one of the bearings being in advance of the cutting mechanism and the other of the bearings with respect to which the shaft is longitudinally movable being at the rear of the cutting mechanism, a supporting frame for the rear bearing, the said frame comprising two parallel bars, one on each side of the bearing, and jack screws adapted to pivotally engage at opposite points the walls of the tunnel formed by the cutting mechanism, and a connection between `the rear bearing and the said frame adapted to permit relative pivotal movement about an axis perpendicular to the said parallel bars, substantially as set forth.

6. In a tunneling machine, the combination of a rotary cutting mechanism, a rotary shaft on which the cutting mechanism is mounted, two shaft bearings with respect to one of which the shaft is longitudinally movable each bearing having a non-rotary part, a sup orting frame for one of the bearings, said rame being provided with means for engaging the tunnel walls at opposite points, and means whereby the bearing may.

be` moved bodily relatively to both ofthe points of support of the frame, substantially as set forth.

.7. In a tunneling machine, the combination of a rotary cutting device comprising a main cutting mechanism, a supplementaryr cutting mechanism in advance thereof and adapted to cut an opening in the forward I face of the tunnel, and a bearing for. the

cutting deviceV adapted to enter the opening, the said bearing comprising a rotary support for the cutting device, a non-rotary sleeve surrounding said support and adapted to engage the walls of the said opening, and rollers between the said rotary support and the non-rotary sleeve, forth.

u 8. In a tunneling machine, the combination of a rotary cutter head, a cutting mechanism rigidly connected thereto and adapted to cut. the forward face of the tunnel, and a reciprocatory tool on the cutter head adapted to strike a wall of the tunnel at an acute angle relative to the wall and to the line of rotary movement of the tool to rotate the cutter head`and actuate the cutting mechanism connected thereto, substan-` tially as set forth. l

9. In a tunneling machine, the combination of a rotary cutter head, and a plurality of cutting devices connected to said head. some of said devices being rigidly attached and others being reciprocatory tools adapted to strike the forward face at backward acute angles relative to the lines of rotary movement of the tools to rotate the cutter head and actuate the other cutting device, substantially as set forth.

10. VIn a tunneling machine, the combination of a rotary cutting mechanism comprising a plurality of reciprocatory tools adapted to operate at angles to the axis of the mechanism and to the lines of rotary movement of the tools, `a second cutting mechanism adapted to cut an opening in the forward face of the tunnel, and a support for the' first cutting mechanism adapted to enter the said opening and engage the walls thereof, substantially as set forth.

11. In a tunneling machine, the combination of a rotary cutterl head, a cutting mechanism attached thereto, and reciprocatory tools arranged to strike the cylindrical wall of the tunnel at a backward acute angle relative to the lines of rotary movement of the tools to rotate the cutter head and the attached cutting mechanism, substantially as set forth.

12. In a tunneling machine, the combination of a rotary cutter head, a cutting mechanism attached thereto, and devices arranged to engage the cylindrical wall of the tunnel to rotate the cutter head and the attached cutting mechanism, substantially as set forth.

substantially as set' 13. In a tunneling machine, the combination of a rotary cutter head, reciprocatory cutters adjustably mounted on the cutter Ihead and each adapted to strike the forward face of the tunnel at any one of a plurality of backward acute angles relative to the lines of rotary movement of the cutters to rotate the cutter head, and supplementary means connected to the cutter head and adapted to engage and push against the cylindrical wall of the tunnel to aid the rotation of the cutter head, substantially as set forth.

14. In a tunneling machine, the combination of a rotary rock cutting and breaking mechanism, constructed and arranged to act upon the entire area of the forward face of the tunnel and means foradjusting the cutting and breaking mechanism to cut tunnels ofdiiferent diameters, substantially as set forth.

15. In a tunneling machine, the combination of a rotary cutter head comprising a plurality of radial arms, each arm having a radially adjustable section, and cutters mounted upon the adjustable sections of the .said arms.

16. In a tunneling machine, the combination of a rotary cutter head comprising a plurality of radial arms, each arm having an adjustable section, and a plurality of cutters mounted upon the said arms, some of said cutters being on'the adjustable sections and some on the fixed parts. of the arms, substantially as set forth.

17. ,In a tunneling machine, a rotary cutting device comprising means for cutting a central opening in the forward face, a nonrotary support arranged to enter the opening and engage the walls thereof, means for cutting an annular groove in the forward face at its circumference, and means for cutting an annular groove in the forward face between the central opening and the circumferential groove, substantially vas set forth.

18. In a tunneling machine, the combination of a rotary cutter head, a cutting device connected to the head for cutting a central opening in the forward face of the tunnel, a support arranged to enter the central opening and engage the walls thereof, cutting de- `vic`es for cutting a plurality of annular grooves concentric with the central opening, and means operating automatically and-simultaneously with the central cutting device and the groove cutting devices for breaking down the material between the grooves and v between the inner groove and the central opening, substantially as set forth. j

19. In a tunneling machine, the combination of a rotary cutting mechanism comprising a plurality of reciprocatory tools for cutting a plurality of substantially separated annular grooves in the forward face of the tunnel, the said tools being arranged to operrasa-,eee

ate at backward acute angles relative to the forward face and to their lines of rotary movement, and reciprocatory devices for breaking down the material between the grooves, the said devices operating in a plane behind the bottoms of the grooves and at backward acute angles to the face of thetunnel and to the lines of rotary movement of the devices, substantially as set forth.

20. In a tunneling machine, the combination of a rotary mechanism comprising a plurality of reciprocatory rock engaging tools arranged in two groups, those of one group being arranged to cut a plurality of substantiallyv separated annular grooves in the forward face of the tunnel and those of the other group being arranged to operate simultaneously with those of the first group in aplane behind the bottoms of the grooves to break the material between the grooves, and means whereby each of the tools may beindependently adjusted to engage the forward face of the tunnel at any one of a plurality of angles with respect to its line of rotary movement, substantially as set forth.

21. In a tunneling machine, the combination of a rotary mechanism comprising a plurality of reciprocatory -rock engaging tools arranged in two groups, those of one group being arranged to cut a plurality of substantially separated annular grooves in the forward face of the tunnel and those of they other group being arranged to operate simultaneously with those of the first group in a plane behind the bottoms of the grooves to break the material between the grooves, and means whereby the tools of one group may be adjusted to strike the face of the tunnel at diiferent angles with respect to the lines of rotary movement from the tools of the other group, substantially as set forth.

22. In a tunneling machine, the combination of a forward cutting mechanism adapted to form an opening, a conveyer adapted to carry material backward from the cutting mechanism, a second cutting mechanism behind the first cutting mechanism and adapted to cut a larger opening concentric with the first openin a conveyer behind the second cutting mec anism, and a scoop ,for elevating debris discharged from the first conveyer and the second cutting mechanism and delivering it to the second conveyer, substantially as set forth. l

23. In a tunneling machine, the combination of a linearly moving cutting mechanism, a support in advance of the cutting mechanism and adapted to move therewith, a stationary support behind the cutting mechanism and arranged to permit adjustment of the cutting mechanism about a transverse axis and about a vertical axis and means connected to the said stationary support for linearly feeding the cutting mechanism, substantially as set forth.

24. In a tunneling machine, the combinaforce to be applied to the cutting mechanism, 10 tion of a linearly movable rotary cutting substantially as set forth.

mechanism, a support in advance of the cut- In testimony whereof I ax my signature tlng mechanism and adapted to move therein presence of two Witnesses.

with a stationary support ehind'the cutting f meclianism, means connected to the said sta- EDWARD S' MCKINLA tionary support for linearly feeding the cut- Witnesses:

ting mechanism', and means for engaging the E. L. PRENTLss,

cyllndrical tunnel Wall to cause rotative J. H. PFUSCH.