US568937A - Mining machine - Google Patents

Description

Sheet 1-. Y

2 Sheets H.- H. BLISS.

MINING MACHINE.

Patented 0011.6, 1896.

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' H H BLISS I MINING MACHINE.

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UNITED STATES PATENT OFFICE.

HENRY BLISS, WASHINGTON, DISTRIOT'OF COLUMBIA.

MINING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 568,937, dated October 6, 1896.

Application filed July 27, 1891. Serial No.400.893. (No model.)

To all whom it lIl/l-j/ concern:

Be it known that I, HENRY H. BLISS, a citizen of the United States, residing at \Vashington, in the District of Columbia, have invented certain new and useful Improvements in Mining-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

Figure 1 is a top plan view of a part of a mining-machine embodying my improvements. Fig. 2 is a side view. Fig. 3 is a rear view. Fig. 4 is a longitudinal section of the frame. Fig. 5 is a partial section, enlarged, on the line Fig. 1. Fig. 6 shows a modified form of drill-support. Figs. 7 and 8 show oomparatively the different action of the machines heretofore in use and of that herein. Fig. 9 is a cross-section on the line 00 0c of Fig. 1. Fig. 10is a partial plan view. Figs. 11 and 12 are a plan and a side elevation of a modified form of carriage-moving mechanism.

This invention relates to improvements in mining-machines of the sort wherein use is made of a chain for both actuating and carrying the cutters.

One of the objects is to provide means for clearing a path for the cutterchain at the sides of the machine.

Another object is to provide an improved arrangement of the cutter-chain and the supporting-frame whereby it shall be held properly with respect to the carriage, the bed, and the material being out.

Another object is to provide a chain cutting mining-machine havinga bed-frame and a carriage comprising a sliding thrustingframe which supports the chain directly in the planes of the thrusting-frame and parallel to the bed but relatively remote therefrom, with devices for holding the chain-frame in proper lines.

In order to support the cutting apparatus and the driving mechanism, any suitable carriage or bed or main frame can be employed. As shown, a bed is provided consisting of side bars A A, connected by cross-bars a and-supported upon shoes A. Upon this bed acarriage is mounted having a rear part B and forwardly-extending bars 13. The bars B constitute the main longitudinal part of the chain-frame and are fitted in guides at A supported by the bed or main frame, and at the rear are secured to the rear part. B, which latter comprises a plate or platform fitted in guides on the longitudinal bed-bars A and having projecting parts for supporting the motor, together with the driven shaft and gearing.

The cutting apparatus comprises a drill or drills C and a chain D, provided with cutters d. The drill-stems c are mounted in hangers or carriersE at the rear and E at the front ends. The bits or cutters of the drills may be of any suitable sort. They are r0- tated by suit-able gearing, that shown comprising worm-wheels F and worms g on the main driving-shaft G. The chain D, provided. as aforesaid, with cutters (Z, is so arranged as to have the active ends of the cutters pass beneath and out from under the coal on the longitudinal lines of the apertures formed by the drills, so that there shall be no resistance to the said cutters either when entering or coming out, and so that the cutters shall be permitted to take their work squarely.

The chain D is carried by two front Wheels D D and is driven bya rear wheel D there being in Fig. l idlers or wheels at D D. The wheels D D are carried by the bars BB of the sliding frame either directly or by means of one or more cross-bars H H.

The cross-bars H H may be integral with the drill-brackets E E, or the latter may be formed separately and adapted to carry both the drills and the chain-wheels, (see Fig. 5,) in which case they will be bolted or otherwise firmly fastened to the cross-bars H H; or the brackets for the drills may be formed separately from the support of the chainwheels, as is shown in Fig. 6.

The shaft Gis driven by a motor I through a train of suitable gearing i i. It carries the worm g, engaging with a wheel K on a shaft k. This shaft carries the chain driving wheel D Of course any suitable motor can be used;

but I have found that an arrangement thereof ing-machines the power has been generated,

or applied on longitudinal lines at the center of the machine in such way as to necessitate the use of numerous wheels and more or less complicated shafting and gearing. It is well known to be desirable to use, as largely as possible, straight spur-gearing in machines of this character, because of the economy of the power, particularly for taking the power from the motor to the shafting which distributes it to the different operating parts.

In the present machine the armature-sliaft is placed transversely and connected by straight gear with the main cross powertransmitting shaft G, which, in turn. is geared directly to the chain-driving shaft and to the carriage moving mechanism. In this way there can be the fullest economy of power.

I have not shown all of the details of the standards or brackets for mounting the various shafts and wheels, as in that respect preference or circumstances can be followed at will.

It will be seen that a relatively large driving pinion is indicated on the armat ureshaft, by which ample speed is insured for the worm-gearing that drives the chain-actuating shaft 1;, but of course with respect to such matters as speed, the ratios, and kinds of gearing preference can be exercised and modifications made without departing from the essential features of arrangement and construction of the parts.

It will be seen that when the motor or engine is in motion the shaft G will cause the rotation of the drill-stems O 0, together with the drills, and at the same time, through the wheels K and D will drive the chain D so as to compel its cutters to travel in the direction of the arrow, Fig. 1, and they will remove the material lying between the drill-apertures. At the same time the carriage is advanced. This is done in any suitable way. I have shown a rope and drum, the former being indicated by L and the latter by L. The rope is secured to the bed-frame, and the drum is mounted upon the carriage. It is rotated by a worm M on shaft G, which worm drives worm-wheel M on shaft on. At the lower end of the shaft there is a worm m, which, meshes with the worm-wheel N on the drum. The relative speeds of the parts mentioned should be such as to cause the carriage to advance slowly while the cutting is being effected.

The carriage can be withdrawn in any suitable way. There are numerous old and wellknown devices for advancing and withdrawing the carriages of these machines, any preferred form of which can be used. In Figs. 10 and 11 there is shown one form. In this the carriage-advancing drum L is loose upon a shaft Z, and upon the same shaft there is another drum L and a clutch L which is splined to the shaft. A rope or cable L is secured to the drum L and also to the rear part of the frame. After the carriage has been moved forward the clutch L is moved into engagement with the drum L and as the rope is carried from this drum in a way 0pposite to that in which the advancing rope L is taken from its drum the continuous rot-ation of the shaft 2' will cause the pulling back of the carriage. The drum L is made of a diameter larger than that of the drum L, the dimensions in these respects being such as to produce the desired differences in speedsthat is to say, the carriage generally should go forward with a relatively slow speed, while for the sake of economyit should be brought back with a considerably higher speed. At the same time it is not desirable to reverse any of the rapidl y-'-driven parts of the machine. The present construction of carriagemoving apparatus meets both of these ends,- as it. is merely necessary to move the clutch from one drum to the other to reverse the motion of the carriage, and as the diameter of the pulling-back drum is larger than that of the fced-dru m the speed will be correspondingly great er during the backward movement.

By em ploying a single drill at one end of the cut all the desired purposes can be reached. A passage-way is formed by it for the forwardmoving part of the cutter-chain, and the backward-moving part of the chain has a passageway provided in the previous cut, so that the cutters when in engagement with the coal are delivered to and removed from their work in the way shown in Fig. 8. A comparison of Figs. 7 and 8 will disclose the great advantage incident to having perfectly free passageways for the chain cutters atall times other than when they are traversing the line of out. In using chain cutting-machines as heretofore constructed serious trouble and loss of power have been experienced from the fact that there is more or less engagement of the cutters with the coal both as they are just reaching the line of movement across the face and when they are moving backward therefrom. The chains, as is well known, necessarily become slack after being used, and then when subjected to strain in operation they tend to be displaced from their carrying-wheels. By providing an unobstructed pathway for them when moving inward and moving outward from their line of operation their action can be made much more uniform on the operative line, they can be held more firmly in place upon the supporting-wheels, and the cutters can be held squarely to their work.

The drill or d rills act to prevent side thrust, that is, obviate any lateral reactionary movement of the bed or carriage because of the engagement of the chain cutters with the coal. Machines have been heretofore constructed having cutter-chains and drills arranged on a horizontal line near the central vertical plane of the machine and above the central part of the chain. It is toobviate the difficulties and loss incidentto machines of that sort that the present form has been provided. The last-described drill arranged centrally of the machine has been employed for the purpose of steadying the machine and preventing side thrust. By using it a large aperture is bored in the coal,'which not only consumes power,but causes a waste of the material. In my case the aperture that is thus formed is so arranged as to form part of the necessary undercutthat is to say, the kerf formed by the chains is horizontal in the same plane as the aperture formed by the drill or drills; and therefore, in addition to providing an unobstructed passage-way for the chaincutters and in addition to overcoming the lateral reactionary thrust, the drills are utilized to shorten up the amount of cutthat is required of the chain.

I am a are of the fact that it has been heretofore proposed to use a machine having at the front end of the carriage a transverse reciprocating saw or cutter and longitudinallyarranged drills at the ends of the saw; but several serious diificulties have been experienced in attempting to use machines of the sort referred to. As the saw moves back and forth it tends to carry the cuttings away from the paths of exit as much as it tends to carry them toward said paths. The cutter-bar or saw-shank itself blocks or fills up the pathway directly behind the cutters, so that the cuttings or slack is compelled to move laterally until it reaches the drill-apertures. This, in practice, it has been found exceedingly difficult to attain. Another style of machine has been also proposed similar to that last described, except that the reciprocating saw was duplicated, the upper movingto the right while the lower moves to the left, and there beinga vertical space provided between them, through which space the cuttings could be drawn backward.

I obviate all trouble of blocking or choking the machines by the cuttings by having the chains arranged in such way that the cuttings will be carried out continually in one direction.

I prefer to have the dimensions of the drillaperture and of the slot formed by the chain cutters proportioned to each other substantially as shown in Fig. 6. This enables me to give a strong support to the drill at the front or working end, also tocarry the cutters forward through the drill bracket or support, and to have the cutters so related in dimension to the vertical dimensions of the parts which support the chain that said cutters shall open up a kerf large enough to permit the said supporting parts to move freely under the coal. The bracket E'has a bearing parte for the drill, an upper arm 6', and a lower part 6 One of these carrying-arms can be dispensed with when the dimensions of the out are such that sufficient metal can be interposed between the drill and the carriage to carry the former sufliciently firmly.

To assist in preventing the operative parts of the drill from experiencing any side or lateral reactionary thrust as a result of the action of the chain cutters cl, I employ a shoe or bearing-piece R at or near the drill-head, which receives any pressure from the chain tion,,the latter projecting laterally.

' cutters and relieves the drill. It may be secured to the carriage in any preferred manner, and travels therewith in such way as to bear against the vertical wall of the coal. As shown, it projects laterally from the carrier D. Its wall engaging or bearing surface is preferably rounded.

By examining Fig. 5 it will be seen that the aperture cut by the drill is considerably larger than this steadying piece or projec- Aholder of this sort is superior to one of the sort heretofore used, consisting of a drill-bracket of the same diameter as the aperture cut by the drill. Mine extends out in one direction only-that is, to the outer side of the circle of the cut, there being around the greater part of such circle nothing to contact with the wall of the bore.

By an examination of the drawings it will be seen that the machine here shown differs materially, in several respects, from the earlier ones having chain cutters. The chain travels in a plane always parallel to the pathway or guide on the bed which is followed by the motor-support or rear part of the carriage.

Objections are incident to those machines which have the rear chain-driving wheel in one horizontal plane (relative to the bedguide) and the front wheels in another plane. In such cases the plane of the chain is inclined downward from the rear to the front in relation to the planes of travel of the carriage, due to the fact that the chain-driving wheel has to be somewhat higher than the front wheels in order to have the chain cross over the carriage-bars and the bed-bars. The consequence is that the chain does not cut squarely across the lines of travel as it advances bodily, but the cutters are dragged on the top and bottom of'the kerf, necessitating a different arrangement and adjustment of the upper and lower cutters, and even with such adjustment there results an unevenness of action in the two sets of cutters.

The only way heretofore suggested for arranging the cutter-chain parallel to the bedframe has been to bend the carriage-bars downward at the rear and place the chain, the front cross-head, the front wheels, and the side idler sprockets or guides in planes above and eccentric to the planes of the thrustingbars of the carriage-frame. The result of this is to have all of the powerful strain of the machine on lines where it cannot be resisted by the thrusting-bars, but, on the contrary, the latter are bent or buckled up by the eccentric draft. To avoid these difficulties, I first place the chain and its special frame in a plane relatively remote from but parallel to the plane of the bed-guides.

Then I mount the sliding guide-bars B, the cross-bar H, the front chain-wheels, the rear driving-wheel, and the chain itself all sub-.

stantially concentric as to the central plane of travel of the chain-links, which plane is parallel to that of the guide on the bed-bars,

which controls the path of the cutting apparatus as a whole.

It will be seen that there is a relatively large open space horizontally between the edges of the chain cutters and the bed-bars, (see Fig. 2,) so that these can be moved very rapidly across the lines of the bed-bars without any danger of striking or interfering with them, this free space resulting from the presence of vertically-extended supports, as at A which support the chain-frame in a position relatively remote from the bed-bars and yet hold said frame parallel to the bed-guide. Then to avoid the weakening of the framework of the machine, which might result from thus placing the chain-frame and the bedbars A in horizontal planes relatively remote from each other, (which weakness would be felt by the bars B and their front support and guide,) I employ a bracing and holding projection, as at R, secured to and traveling with the carriage-frame and bearing against the vertical wall of the coal, it relieving the chain-frame of the lateral twist or torsion which it would otherwise experience by being disposed in a plane more or less distant from the planes of the bed-bars A.

I am aware of the fact that machines heretofore made have had a relatively small chaindriving wheel, as at D together with wheels or supporting-guides, as at D and the chain being supported so as to travel in straight lines diverging outward from the central lines of the machine; but I believe myself to be the first to have devised a machine of this sort wherein arelatively small and correspondingly powerful drive-wheel, as at D could be employed, together with a front chain-support extended laterally (as from wheel D to wheel D and wider than the bed, with a chain diverging from the drive-wheel D outward on straight lines, and with thrusting and carrying bars, as at B, in the central lines of thrust of the chain and have all of these parts arranged, as aforesaid, in the same plane, which plane is parallel to the bed-guide.

I am also aware of the fact that chain cutter-machines have been made with various forms of legs, rollers, or ground supports. The present construction is of the class in which use is made of runners or shoes at A, by which the machine can be readily slipped forward or back when it is to be bodily moved, as it has to be every few minutes. There is serious disadvantage incident to these chain cutter-machines which have legs or shoes separated from each other, some at the front and some at the rear. The chains extend over so much space that their cutters are a serious obstruction in transporting the machine or adjusting it on the ground and frequently are the ca use of accidents. hen the bed is placed on such longitudinal runners as those at A, it can be readily slipped over the ground by the application of bars at the ends.

, What I claim is- 1. The combination of the carriage, the drill,and the chain carryingcutters, arranged to move forward longitudinally in the aperture formed by the drill, and then transversely at an angle to said aperture, substantially as set forth.

2. The combination with the carriage, of the drill, the bearing for the said drill, and the chain provided with cutters and arranged to travel first longitudinally of the machine and then transversely in the plane of the drill-apertures, substantially as set forth.

3. The combination with the carriage, of the drill, the chain provided with cutters moving continuously in one direction in the plane of the drill and mounted independently thereof, and the drill bracket or support extending across the vertical planes of the path of the chain cutters. substantially as set forth.

4. The combination with the carriage, of the drill, the chain provided with cutters moving transversely in the plane of the drill, forward from a wheel on the rear of the carriage across the front of the carriage and then to the rear thereof, and the drill support or bracket arranged to move partly in the aperture formed by the drill and partly in the kerf formed by the chain cutters, substantially as set forth.

5. The combination of the carriage, the drill, the chain having cutters moving transversely in the plane of the drill, and the shoe or traveling abutment, as at R, substantially as set forth.

6. The combination of the bed, the carriage, the chain provided with cutters and moving transversely across the front end of the carriage,and a holding projection secured to the carriage and extending outward in the horizontal planes of the chain and engaging with the wall of the coal to provide the carriage with an abutment against lateral movement, substantially as set forth.

7. The combination of the bed, the carriage, the single cutter-chain moving transversely across the front end of the carriage, the devices for advancing and withdrawing the carriage on the bed, and a projection mounted stationarily on the front end of the carriage and engaging the side wall of the main kerf, whereby said projection forms an abutment for the carriage against the lateral thrust of the cutters, substantially as set forth.

8. The combination with the' carriage, of the drill, the chain having cutters moving transversely of the machine in the planes of the drill, and the arms orbrackets for carrying the drill having inner ends of a vertical dimension less than the kerf formed by the chain cutters and having passages for the said chain cutters, substantially as set forth.

9. The combination of the carriage, the chain having cutters which move transversely across the path of the carriage, and a cutting mechanism at the end of the path of the 0perative part of the chain, arranged in advance of the cutters at the said end of said path, said cutter-chain and said cutting mechanism lying in the same horizontal planes whereby the chain cutter operates in transverse lines only, substantially as set forth.

10. The combination of the carriage, the chain having cutters moving transversely of the carriage and the drill forming an aperture of a vertical dimension greater than that of the kerf formed by the chain cutters, and the drill support or bracket having a part wider vertically, an d a part narrower vertically than the kerf of the chain cutters, substantially as set forth.

11. The combination with the bed having channel-bars, front carriage-guides located in horizontal planes other than those of the channel-bars, and the front chain-guide wheels, of a rear chain-driving wheel, a cutter-chain traveling on lines diverging from said wheel and subsequently around front guide-wheels,

and a carriage across the front end of which said chain travels on said guide-wheels, said carriage having a rear portion sliding in said channel-bars of the bed, and also having one or more longitudinal sliding guide-bars lying in the horizontal planes of the chain, and sliding in said front guides on the bed, all of said parts being arranged substantially as described whereby powerful leverage can be imparted through a relatively small driving sprocket-wheel, and the planes of travel of the chain and the carriage can all be maintained parallel to the horizontal planes of the kerf, substantially as set forth.

12. The combination with the bed having side bars, and cross-braces connecting said side bars, and a carriage mounted on said bed, having a chain guiding and supporting frame, an endless cutter-chain passing entirely around the said chain-guiding frame in a path extending from a relatively small main driving-wheel on lines diverging outwardly from the said driving-wheel for guiding the chain across the front, said chain supporting and guiding frame, said driving-wheel, said loose wheels, and said chain all being arranged in the same substantially horizontal planes,

other than the horizontal planes of the bedbars, substantially as set forth.

13. In a mining-machine, the combination, of the bed, the carriage traveling thereon, an endless chain passing from the rear of the carriage across the front thereof, and a steadying projection secured to the front end of the carriage and extending laterally to the side wall of the main kerf, and having a wall engaging or bearing face lying entirely between the upper and the lower horizontal planes of the chain cutters, substantially as set forth.

1%. In a mining-machine, the combination, of the bed having side bars with longitudinal guides, the motor-carriage fitted to the said guides, a cutter-chain arranged and traveling in a plane substantially parallel to the plane of the said guides, a chain-frame having one or more longitudinal thrusting and carrying bars in the plane of the chain-links and, a front cross-support H extended beyond the side lines of the bed, front chain-wheels on said cross-support in the horizontal planes'of the thrusting-bars,a rear chain-driving wheel.

and a chain support or guide between the said driving wheel and the front wheels, said guide being arranged in the plane of the thrusting-bars to support the chain vertically and hold it on lines which diverge outwardly from the driving-wheel, all of the last-said parts (to wit, the chain-frame, the front crosssupport, the front wheels, the driving-wheel, and the intermediate chain-guide) being arranged in substantially the same plane and parallel to the guide on the bed, substantially as set forth.

15. In a mining-machine, the combination of the following elements, namely, the portable bed having longitudinal]y-arranged side bars, longitudinally-arranged shoes or runner-supports below said side bars, a carriage having a motor-support fitted in a guide on the said bars of the bed, a chain-frame having one or more longitudinal thrusting and carrying bars, a cutter-chain arranged in the horizontal planes of the thrusting-bars, and parallel to the plane of the bed-bars, front wheels for said chain, a power-wheel for said chain on the motor-support (all the said wheels being in a plane substantially parallel gitudinal thrusting and carrying bars, a cutter-chain arranged thereon to travel in planes substantially coincident with those of the thrusting-bars and parallel to said bed-guide, a front guide for said thrusting-bars in the plane of the chain-links and held by a support extending vertically away from the plane of the guide on the bed to the plane of the chain, and a rear traveling support for the chain-frame extending vertically to the planes of the cutter-chain, whereby the chain-frame is held in the plane of' the chain and out of contact with the bed-bars to provide free space for the cutters to travel without interference from the bed or runners, substantially as set forth.

17. In a mining-machine, the combination of the following elements, namely, a portable bed having longitudinally-arranged side bars IIO providing a carriage-guideway, longitudinal runners or supports under the bed, a motorsupport fitted to the guideway on the bed, a cutter-chain, a chain-frame having one'or more longitudinal bars B in the plane of the chain, a front guide on the bed fitted to the said bars B, a cross-support H at the front of said bars, a chain-driving Wheel, the last-said parts (to Wit, the d riving-Wheel, the chain, the sliding bars B, and front cross-support H) being held substantially parallel to the aforesaid bed-guides, whereby they can be advanced and retracted without interfering with the bed orground support, and a steadying-holder traveling with the carriage and bearing against a Wall of the coal to prevent torsion of the chain-frame and hold it in line, substantiall y as set forth.

18. The combination of the bed, the carriage, the cutter-carrying chain, the rear horizontal driving sprocket-Wheel, the vertical shaft secured to said sprocket-Wheel, the carriage-moving mechanism having a rotary member secured to and mounted on the carriage on a transverse axis immediately behind the vertical chain-driving shaft, and a relatively stationary member secured to the bed and engaging with the rotary member, the electric motor mounted on and traveling with the carriage in fixed relations to the r0- tary member of the carriage-movin g mechanism and to the cutters, the chain-driving gearing actuated by the electric motor, and the worm and wormgearing interposed between the chain-driving gearing and the carriagemoving mechanism,substantially as set forth.

19. The combination of the bed, the carriage, the cutter-carrying chain, the horizontal chaiu-drivin g sprocket-wheel, the vertical shaft carrying said sprocket-wheel, the carriage-moving mechanism having a rotating member mounted on the carriage on a transverse axis, and a stationary member secured to the bed and engaging with the rotary member, the electric motor secured directly to the carriage and moving therewith in fixed relation to the cutters and the carriage-moving mechanism, said motor being connected to the said chain-driving shaft, and the longitudinally-arranged shaft connecting the chaindriving mechanism with the transverse carriage-moving mechanism, substantially as set forth.

20. The combination of the bed, the carriage, the cutter-carrying chain, the horizontal driving sprocket-Wheel, the vertical shaft carrying said Wl166l,1I-h6 electric motor secured to the carriage, the transversely-mounted rotating carriage-moving mechanism below the motor, the power-gearing situated on the carriage in front of the motor for actuating both the vertical chain-shaft and the carriageemoving mechanism, substantially as set forth.

21. The combination of the bed, the carriage, the chain provided with cutters, the horizontal driving sprocket \vheel, the vertical shaft carrying said Wheel, the shaft and gearing in front of said vertical shaft and connected thereto, the carriage-moving mechanism having a rotary member mounted on the carriage behind the vertical shaft,and the intermediate lon'gitudinally-arranged shaft for driving the carriage-moving mechanism and extending therefrom to the aforesaid shaft and gearing in frontof the vertical chain-drivingshaft, substantially as set forth.

The combination of the bed, the carriage, the cutter-carrying chain, the horizontal driving sprocket-Wheel therefor, the vertical shaft carryingsaid sprocket-wheel, the motor, the power-shaft and gearing in front of the motor and connected to the vertical chain-shaft, a rotatin carriage-moving mechanism mounted transversely on the carriage behind the vertical chain-shaft, and the longitudinally-arranged power-shaft connected to the said carriage-moving mechanism and extending forward to the aforesaid shaft and gearing in front of the motor, substantially as set forth.

23. The combination of the bed, the carriage, the cutter-carrying chain, the horizontal driving sprocket-wheel therefor, the vertical shaft carrying said sprocket-Wheel, the motor on the carriage, the transverselymounted rotary carriage-moving mechanism on the carriage behind the vertical chainshaft, the gearing in front of both the motor and the vertical shaft for driving the chain, and a shaft extending backward from said front gearing and under the motor, and connected to the carriage-moving mechanism, substantially as set forth.

24. The combination of the bed, the car riage, the cutter-carrying chain, the horizontal driving sprocket-w11eel therefor, the chaindriving mechanism having a vertical shaft for said sprocket- Wheel and a horizontal power-shaft geared to the vertical shaft, the carriage-moving mechanism having a rotary member mounted transversely on the carriage behind the vertical shaft, and the power-shaft driven by the said chain-driving mechanism and connected to the said rotary carriage-movin g member, substantially as set forth.

25. The combination of the bed, the carriage, the cutter-carrying chain, the horizontal driving sprocket-Wheel therefor, the vertical shaft for said wheel, the transverse power-shaft geared directly to the vertical chain-shaft, the electric motorhaving a transversely-mounted armature-shaft, the gearing connecting the armature shaft and said power-shaft, a carriage-moving mechanism also mounted transversely on the carriage, and a longitudinal shaft between the carriage-moving mechanism and the transverse power-shaft, substantially as set forth.

26. The combination of the bed, the carriage, the cutter-carrying chain, the horizontal sprocket-Wheel for said chain, the vertical shaft carrying said Wheel, the electric motor with the transversely-mounted arma ture, the transverse power-shaft interposed between the. motor and the vertical shaft, and the straight spur-gearing at the side of the motor in the longitudinal planes of the machine and interposed between the armature and the transverse power-shaft, substantially as set forth.

27. The combination of the bed, the carriage, the horizontally arranged endless chain, the frame for the said chain, the rear driving sprocket-Wheel, the vertical shaft carrying said sprocket-wheel, the horizontally-arranged power-shaft geared to the vertical shaft, the carriage-moving mechanism on the carriage, the longitudinally-arranged intermediate shaft geared to the said powershaft and to the carriage-m oving mechanism, the electric motor secured to the carriage and having a transverselymounted armatureshaft, and the straight spur-gearing at the side of the machine in planes parallel to the vertical longitudinal planes thereof and connecting the armature-shaft with the transverse poWer-shaft, substantially as set forth.

28. The combination in a mining-machine,

of the bed, the carriage moving in a guide thereon, a chain, provided with cutters, mounted on said carriage'and moving in one direction across the front end of the carriage, a drill arranged to 'bore an aperture additional to the kerf formed by the chain, and a steadying or holding projection situated eccentrically as to the axis of the drill and extending laterally to the outer circle of rotation of the cutter on the drill, said bearing projection and its support being smaller in cross-section than said bore,whereby friction is reduced, and a space for clearance is provided, as set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

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