US2021664A - Mining machine - Google Patents

Description

Nov. 19, 1935.- vvN D EWN l 2,021,664

MINING MACHINE Filed March 3l, 1950 6 Sheets-Sheet l A A mmwfab@ MINING MACHINE Filed March 5l, 1930 6 Sheets-Sheet 2 \5O wf?) llb @Mam Nov. 19, 1935. N. D. L EvlN A 2,021,664

MINING MACHINE Filed March 3l, 1950 l 6 Sheets-Sheet 3 Nov. 19, 1935. N D, LEWN 2,021,664'

MINING MACHINE Filed MarCh 3l, 1930 6 Sheets-Sheet 4 Nw. w, 1935. N, D. LEWN 2,021,664

MININQMACHINE Filed March 5l, 1930 6 Sheets-Sheet 5 Nov. I9, 1935. N D, LEV|N- f 2,021,664

MINING MACHINE Filed March 51, 195o e sheets-sheet e 1 l N'\ N N /f Q. l o Q E 4 l I Patented Nov. 19, 1935 nNiTEo STATES PATENT OFFICE MINING MACHINE Application March s1, 1930, serial No. 440,321

46 Claims.

The present invention relates to mining machines of the long wall arc wall type provided with cutter bar supporting means, whereby the cutter bar may be turned relative to its support to execute shearing cuts developed about the axis of cutter bar oscillation.

It is known, in this type of machine, to provide cutter bar mounting means whereby the normally horizontally extending cutter bar may be swung about a horizontal axis, and about a further axis perpendicular to the horizontal axis. According to the present invention, the cutter bar mounting means are secured to a support which, itself, is rotatable about a vertical axis, and due to this arrangement the machine is adapted to perform operations impossible with machines as heretofore constructed. In addition to this feature, the invention relates to novel means for controlling the movement of the cutter bar about its various axes.

I shall describe an illustrative embodiment-of my invention with reference to the accompanying drawings, wherein:

Figure 1 is a plan View of a mining machine embodying the present invention.

Figure 2 is a side elevation of the machine of Figure l.

Figure 3 is an enlarged plan view of the cutter bar end of the machine.

Figure 4 is a section taken along line 4-4 of Figure 3.

Figure 5 is a section on line 5-5 of Figure 3.

Figure 6 is a plan view of driving mechanism for moving the cutter bar about two of its mounting axes.

Figure 7 is a section on line 'I-l of Figure 4.

Figure 8 isa side elevation of a portion of certain clutch operating mechanism.

Figure 9 is a detail.

Figure l0 is a section along line Ill-I0 of Figure 3.

Figure l1 is a section on line I l--II of Figure '7 with parts broken away to reveal other parts, and

Figure 12 is a diagram illustrating a novel shearing cut adapted to be performed by the machine of the present invention.

Referring rst to Figures 1 and 2, reference numeral I3 designates a truck frame mounted on wheels I4 and I5 engaging a track of which one of the rails is shown at I5. Mounted on the truck frame I3 is an electric motor Il which, through suitable transmission gearing indicated at i8, is adapted to drive a cable reel I9, or, through a clutch 20, gearing 2| and sprocket rounded by an eccentric strap 39.

chain 22 is adapted to drive the truck wheels I4 and I5, which latter are connected by means of a sprocket chain 23, in either direction to propel theA truck over the mine tracks at a relative- 1y high speed for the purpose of transporting 5 the machine from one place to another in the mine, or at a relatively slow speed for sumping the cutter bar in a coal face at right angles to the mine tracks. The relatively slow speed isv also available for propelling the machine in -maklng a long wall cut.-

A platform 24 of annular form at the forward end of the truck is supported on three screw pedestals housed in casings 25, 25 and 2l. By means of a chain, a portion of which is shown l5 atA 28, Figure 2, the platform 24 is adapted to be vertically displaced to position its top in the desired horizontal plane or, by differential actuation of the elevating mechanisms, the platform may be tilted. 20

Supported on rollers 29, mounted on platform 24, is a turn table rotatable about a vertical axis. An electric motor 3| is mounted on turn table 30, and is provided With an armature pinion 32 which engages a master bevel gear 33 25 xed on a shaft 34 journaled in a bearing 35 of the turn table. To the upper end of shaft 34 is keyed a bevel gear 36, and between the hub of the latter and the top margins of bearing 35 is `interposed a step bearing 3l. Fixed to the hub 30 33 of gear 33 is an eccentric 36 which is sur- The eccentric strap is adapted to drive a pawl and ratchet device, in the manner indicated, for example, in my copending application Serial No. 296,990, 35 led August 2, 1928, patented July 19, 1932, No. 1,857,853 for the purpose of appropriately rotating a winding drum 4B mounted on a vertical axis on turn table 3D.

A cable 4| is windable on drum 45, and may 40 be trained about the turn table in either direction in engagement with sheaves 42 to be anchored either to a lug 43 or lill, so that upon winding in of the cable the turn table may be swung in the desired direction. Further, the edge of the 45 turn table is provided with notches as at 45 engageable by a bolt mounted on a xed part of the machine to lock the turn table in any desired angular position.

From the above, it will be seen that I have provided an absolutely self-contained base unit bodily movable under its own power, and provided with a turn table swingable and vertically adjustable under motor power. The motor 3 I, which is mounted on the turn table, alsosupplies the power for actuating the cutter bar and moving it about two rectangularly disposed axes relative to the turn table or support 30.

Referring to Figure 4, reference numeral 46 denotes an arm secured to the turn table in normally horizontal position and projecting beyond the turn table periphery. Arm 46 is provided at its ends with bearings 41 and 48, in which is journaled a shaft 49, having keyed at its one end a bevel pinion 50 meshing with pinion 36, and at its other end a bevel pinion 5|.

Adjacent its distal end, arm 46 is provided with a radial flange 52, on which is formed a cylindrical journal 53. Beyond journal 53 the arm is provided with a further journal element 54, connected with flange 52 by means of reinforcing webs 55.

Journaled on elements 53 and 54 is a sleeve 56 of a casing or head 51. Surrounding the extremity of sleeve 56 is the hub 58 of a worm Wheelv 59. Cap screws 60 pass through flange 52 and hub 58, and engage ring segments 6| and 62 which lie in an annular recess defined in part by a shoulder 63 formed in sleeve 56.

Due to the described arrangement, head 51 is rotatable relative to arm 46 and worm Wheel 59 about the axis of shaft 49 on journals 53 and 54, and is retained against axial displacement by flange 52 and rings 6| and 62.

J ournaled in a bearing 64 of head 51 is a sleeve 65 forming a bearing for the lower end of a shaft 66 whose upper end is journaled in a bearing 61 formed in a cover plate 68 of head 51, the axis of shaft 66 intersecting the axis of shaft 49 at right angles. The lower end of sleeve 65 is keyed in an aperture in a cutter bar support 68, the latter being provided with a circular flange 69 concentric with shaft 66. To the outer margins of ange 69 is secured a Worm wheel 10, the latter being in the form of a ring surrounding a circular flange 1| formed on head 51. A pair of ring segments 12 and 13 overlie the adjacent margins of worm wheel 10 and flange 1|, and are secured through the web of the Worm wheel to flange 69 through bolts as at 14 and cap screws as at 15. Flange 1| and ring segments 12 and '13 thus form a step bearing for the cutter bar support, preventing the displacement of the latter in the axial direction of shaft 66, but permitting its relative rotation to the head about this shaft as an axis.

Shaft 66 is provided With a shoulder 66 stepped Y on a bearing washer 16, keyed to shaft 66 and supported on an annular shoulder of bearing 65. To the lower end of shaft 66 is keyed a sprocket 11 secured against axial displacement by means of a pin 18. Sprocket 11 is positioned for rotation in the plane of cutter bar 19, and engages the cutter chain to drive the latter in the well known manner. Freely revoluble on the upper portion of shaft 66 and prevented from downward movement on the latter by means of the shoulder 66" is a sleeve 8| provided at its lower edge with clutch teeth 82 adapted to cooperate with teeth 84 formed on a clutch sleeve 83 splined on shaft 66. Surrounding sleeve 8| and fixed thereto is a hub 85 of a combined bevel gear and eccentric Whose elements are designated as 86 and 81, respectively. Gear 8B meshes with pinion 5| to be rotated thereby when motor 3| is operated. In the position of parts shown in Figure 4, teeth 82 and 84 are disengaged, and gear 86 and eccentric 81, together with sleeve 8| will rotate freely relative to shaft 66. Upon engaging the clutch teeth, however. upon upward movement of sleeve 83', shaft 66 is caused to rotate with gear 86, and thereby drive the cutter chain.

Sleeve 83 is provided with an annular groove 83, in which is engaged a ring segment 89 provided With diametrically opposite lugs as at 89', 5 respectively engaged in the bifurcated ends of form arms, as at 90, the latter being clamped and keyed on a tubular rock shaft 9|.

Rock shaft 9| extends from side to side of head 51, and is journalled in the walls thereof. To 10 the ends of shaft 9|, which project beyond the head, are fixed operating levers 92 and 98, see particularly Figures 3 and 8. Fixed to head 51 to one side of lever 92 is a toothed segment 94.

A latch S5 has an upper hooked end projecting 15 through a slot 92 formed in lever 92, and its shank is slidable in a bore or a lug 92 integral with lever 92. A compression spring 96 surrounds the shank of latch and with its upper end abuts lug 92, its lower end being seated against 20 a washer 91 retained against downward displacement on the shank by a cotter pin 98. The lower end of latch 95 is pivotally connected by means of a pin 99 to one arm of a bell crank lever 69 keyed to a shaft |0| journalled in tubular shaft 25 9|. To the opposite end of shaft |8|, which projects beyond shaft 9| is secured a lever of which only the hub |02 is visible in Figure 3. An operator at the right hand side of the machine, by moving the tail |08', of lever |00 in a clockwise 30 direction is enabled to lift the hooked end of latch 95 clear of the teeth of segment 94 so that lever 92 may be manipulated to engage or disengage clutch teeth 82 and 84. Segment Sii-l is provided with only two teeth, the left one dening 35 the disengaged position of the clutch, and the one at the right the engaged position. An operator at the left of the machine by suitable manipulation of lever |02 is enabled to free latch from segment 94, whereupon the clutch may be manip- 40 ulated through lever 93. It Will be evident that, although only one latch and segment locking means has been provided, this may be Imanipulated from either side of the machine.

Surrounding eccentric 81, Figure 6, is an ec- 45 centric strap |03, to which is rigidly secured an arm |64 whose other end is connected by means of a pin |05 to an oscillable pawl casing E86 disposed in a housing |01 secured to and forming a part of head 51. The pawl housing is composed 50 of two parts |08 and |69 secured together by means of cap screws ||0, pin |05 being disposed in registering apertures in the two sections. Oscillable about two adjacent cap screws i9 are a pair of opposed pawls and H2, these pawls 55 having integral heel portions between which is engaged a compression spring ||3 tending to force the noses of the pawls into enga-gement with the teeth of a ratchet wheel H4.

Ratchet wheel ||4 is xed on a vertical shaft ||5 journalled in a bearing ||6 of housing |91. Set in an annular recess whose lower face is defined by shoulders ||5 and ||6 of shaft H5 and bearing ||6, respectively, is the lower race 65 ring ||1 of a ball step bearing assembly. The upper race ring ||8 is retained beneath an elongated hub I4 of the ratchet wheel, and beneath the inner margin of an annular flange H9 secured to a face |20 of housing |91 by means of 70 bolts |2|. Flange 9 has an integral upwardly extending neck |22 concentric with shaft H5 and forming a journal for a lower cylindrical extension |89 of casing section |09. The upper casing section. |08 is provided with an integral neck 75 |08 journalled ina bearing |23 of a cover plate |24 for housing |01. l

In order that pawls and ||2 may be selectively engaged with ratchet |14 and that their throw may be controlled, a shield |25 in the form of a segmental cylindrical shell is arranged concentrically with the ratchetwheel and surrounding the latter. lt will be obvious from Figure 6, that by properly positioning the shield, both of the pawls may be prevented from engaging the ratchet wheel, or one or the other of them may be permitted to engage the wheel to a greater or lesser extent.

The shield |25, Figure 5, has an integral top wall |26, with which is integral a stud |21 concentric with the shield and journaled in neck |58'. To the upper end of stud |21, see also Figure l0, is keyed a star wheel |25 and imposed on the latter is a bevel gear |29-keyed to shaft |22, and secured against axial displacement relative l thereto by means of a washer |30 and cap screw |3l. In the bifurcated end of a lever |32 is revolvably mounted a roller |33 urged against the star wheel |20 by means of a compression spring |34. The varying resistance of the roller to the rotation of the star wheel indicates to the operator various angular positions of stud |21, and hence of shield |25.

In a bearing casting |35 secured to cover plate |24 is journalled a tubular shaft |35 with its axis intersecting the axis of stud lill at right angles. Secured to one end of shaft |35 is a bevel gear |31 engaging bevel gear |25, while to the other end of the shaft is keyed a sprocket wheel |33.

A shaft |39 extends through tubular shaft |35,

and extends across the top of stud |21. To the shaft |259 and in opposed relation to gear I3? is fixed a bevel gear |40, while to the other end of shaft |35 is secured a sprocket |4|. Bevel gears |3'i and |453 are of exactly equal size, as are also sprockets |33 and |4|. Hence, upon rotation of gear |51 through sprocket |38, gear |40 will cause sprocket to rotate at exactly the same peripheral speed as that of sprocket |35, but in the opposite direction to the latter.

Referring to Figures 3 and 4, a ring |42 has a portion journalled on the hub 50 of worm wheel 59, and retained against axial displacement through abutment with the extreme lateral margins of flange 52 and with the opposed face oi' wheel 55. At one side, ring |42 has formed thereon a radial flange in which are formed gear teeth |42', while keyed to the opposite peripheral surface of the ring is a ring |43 provided with a radial flange in which are formed sprocket teeth |43. Rotatable on ring |42 between teeth |42 and ring |43 is a ring |44 having a pair of radial flanges in which are formed gear teeth |44 and sprocket teeth |44, respectively. The sprocket wheels defined by teeth |43 and |44, are of exactly the same size, as are likewise the spur gears defined by gear teeth |42 and |44. Sprocket wheel |4| is in the plane of the sprocket wheel defined by teeth |44", and is in connection with the latter by means of the sprocket chain |45. Sprocket wheel |38 is in theplane of the sprocket wheel defined by the teeth |43', and is in connection therewith by means of the sprocket chain |45. A pinion |41 is xed on a shaft |48 parallel to the axis of the spur gears defined by teeth |42 and |44' which for the sake of convenience, will be referred to as lgears |42 and |44'. Shaft |48 is journaled in a bearing bracket |40 xed on arm 46. To the other end of shaft |48 is secured a coupling member |50 of a universal joint whose other coupling member |52 is xed to the end of a shaft |53. The opposite end of shaft |53 is journaled in an aperture in a bracket |54 secured to the turn table 30 and has fixed thereon a hand wheel |55. The hubof pinion |41 and coupling member |50 are so spaced on shaft |43 as to permit axial displacement of the latter relative to bearing |49 through a certain distance, so that pinion |41 may either engage gear |42 alone, or may engage gears |42 and |44 simultaneously. A compression spring |56 surrounding shaft |53 abuts with its one end bracket |54 and with its other end a washer |51 retained on shaft |53 by means of a cotter pin |58. The tendency of spring |56 is to maintain pinion Ml in the position shown in Figure 3, in which it engages both of gears |42 and |44. Tensioning means |45 and |40' are provided for chains |45 and |45, respectively.

If it is desired to adjust shield |25, hand wheel |55 is grasped and pulled to compress spring |55 and move pinion |41 out of mesh with gear |44. Upon rotation of the hand, wheel gear |42 and its associated sprocket wheel will be turned, thereby rotating shaft |36 through the inter-- mediary of chain |46 and sprocket |38, whereupon 'through gears |31 and |29, and stud |2i, the shield may be appropriately adjusted. Rotation of gear |29 causes rotation of sprocket |4|, as has been hereinbefore mentioned, and consequently through the intermediary of sprocket chain |45, gear |44 is rotated, 'together with its associated sprocket at the same speed but in the opposite direction to gear |42. When the proper adjustment of shield |25 has been secured, hand wheel |55 is released, whereupon pinion |41 is axially displaced by spring |55 to engage gear |44', as well as gear |42. Due to the fact that neither gear can rotate without causing an opposite rotation of the other, they are thus locked and further displacement of shield |25 is prevented.

Referring to Figures 5 and '7, shaft ||5 has a worm |51 out in itsV lower end, this worm meshing with a worm wheel |58 keyed on a horizontal shaft |59 journaled in a portion |55 of housing |41. Intermediate bearings |5| and |52, shaft |50 has out therein a worm |63 which meshes with worm wheel 10.

It will be evident that rotation of shaft l 5 imparted by either one of pawls l or l2 cooperating with ratchet wheel ||4, will be transmitted through shaft |59 to worm wheel lil to swing the cutter bar about shaft |56 as an axis. The Worm and worm wheel mechanism for swinging the cutter bar is of the self-locking type, but it has been found that the continual vibration of the parts in operation is apt to cause an overtaking movement of the parts in slight degree. Mechanism has, accordingly, been provided to overcome this tendency.

The end of shaft |59 opposite worm |653 has threaded thereon a nut |64 adapted to be secured in adjusted position by means of a pin |65. A step ball bearing assembly |05 is retained between nut |64 and a iixed ring |61 on the one hand, and the hub |58 of worm wheel |58 and a shoulder |00 of housing |60 on the other hand. Nut |64 is provided with an integral annular flange |64", against which lies a washeri of friction material. A metal washer |69 lies against washer |68, and is pro-vided with tongues |39 engaging in recesses of cap the recesses extending in the axial direction of shaft |59 to permit washer |69 to move in that direction, but to restrain the washer from rotary movement. In pockets |1I' of the cap are disposed compression springs |12 bearing on washer |69. The cap, together with ring |61, is secured to housing |68 as by cap screws |13. Washer |69 being non-rotatable and being urgedagainst friction washer |68 by means of springs |12, and Washer |63 in turn being urged against flange If'' of nut i613 which is fixed to shaft |59, rotation of the latter will be frictionally opposed, so that any tendency of shaft |59 to rotate under the reaction of the cutter bar will be overcome.

Referring to Figures 5, 6 and 9, eccentric strap |93 has an integral ear |03' to which is pivotally connected one end of a link |14, the other end of which is pivoted to a rigid arm |15 on a pawl housing |16. In a housing |11 forming a part of the main housing 51 is journaled a perpendicular shaft |18 in bearings |19 and I 88, this shaft having formed therein a worm I8| engaging worm Wheel 59, Shaft |18 at its lower end is stepped on a bearing assembly |82, and is provided with friction braking mechanism |83, exactly as described in connection with shaft ld. The outer periphery of bearings |19 serves as a journal for a cylindrical extension |16' of housing E15. Keyed on the upper end of shaft V58 is a ratchet Wheel ld having a hub |84 which forms a journal for a ring secured in the upper end of housing |15.

A radially extending boss |86 of casing |16 has a radial bore in which is slidable a cylindrical plunger |81 having a pawl tooth |88 adapted to engage the ratchet wheel l 84. A plug |89 is secured in the open end of boss |86, and is provided with a central bore through which passes a pin |99 whose inner end is secured to plunger |81. Interposed between plunger |31 and plug 89, and surrounding pin |98 is a compression spring |95.

Plug |89 is provided on its exterior portion With a diametrical groove |89', in which is adapted to be received, as in Figure 6, a block |92 xed to the outer end of pin |98 and provided with a handle |92. In the position of parts shown in Figure 5, the pawl tooth |38 is effective to r0- tate the ratchet wheel in a counter-clockwise direction. Upon retracting the pawl tooth through the intermediary of handle |2 and turning block 92 until it overlies the walls of groove |89', as in Figure 9, the tooth is rendered ineffective to rotate ratchet |84. Upon turning handle |92 one hundred and eighty degrees from the position shown in Figure 6, the pawl tooth |88 will be effective to rotate the ratchet in a clockwise direction.

It will be recalled that worm wheel 59 is fixed against rotation and, consequently, rotation of worm |85 through the intermediary of the pawl and ratchet device, just described, will cause the worm to travel around the worm wheel, carrying with it head 51, as a whole, and thus moving the cutter bar about shaft 9 as an axis.

From the above description, it will be noted that upon operation of motor 3| in a single direction, cutter bar 1S may be swung in either direction about shaft |39 or shaft 66, and its speed of movement about the latter may be controlled as desired. While the bar is being so moved, the drive to the cutter chain may be interrupted through disengagement of clutch elements 8| and 83. If it is desired to drive the cutter chain in the opposite direction, motor 3| is reversed. M0- tor 3| also supplies power for the operation of drum 40 to swing the turn table 3D about its vertical axis, and thus forms the power means for effecting movement of the cutter bar about each and all of its axes.

The machine is adapted to make both wide and narrow cuts. Wide faces may be overcut or undercut, or cuts may be made in the middle of the vein. The Wide or full swinging cuts may be made by swinging the cutter bar about its forward pivot E6, or may be still wider by swinging the turn table and locked cutter bar about the turn table pivot.

Cuts may be made in a plane parallel to the center line of the track at either side of the center line by swinging the cutter bar about its then 15 horizontal forward pivot 66 when cutting in high coal, or by locking the bar at angles to the horizontal longitudinal center line of the machine with the outer end of the cutter bar in engagement with the roof, moving the machine forward 20 the bar by the reverse movement of the truck. 25

Further shearing cuts may be made in planes at angles to the vertical central plane of the track. Also, shearing cuts may be made at right angles to the line of the track, or at other angles in a face parallel to the track.

The pedestal mounting of the turntable renders the latter universally tiltable, that is, by differential actuation of the three screws, the turn table may be tilted in any direction out of the horizontal. This feature is of great importance in the present combination since it enables the cutter to be readily swung at an angle to the horizontal (or vertical) when making cuts to the side of the track. In this manner the bar may be maneuvered above or below obstructive bodies in the vein. If desired, when making such cuts either at the side or in front of the machine, the turn table may be tilted in a plane substantially parallel to the kerf to be cut in the face and then swung about its pivot to feed the cutter bar. Simultaneously the cutter bar may be swung about shaft 66 in the opposite direction at such a rate as to maintain the longitudinal axis of the bar substantially normal to the face.

A particularly novel operation which consists in shearing on a curve in cutting a room neck off the entry is diagrammatically shown in Figure 12. In following out this method, a portion of the rib is either overcut or undercut as at A, Figure 12. 'I'he machine is on the straight track B, and the cutter bar positioned in a horizontal plane parallel to the rib. Either on going in or coming out, the cutter is manipulated to form that portion of the cut indicated at C, this cut defining the curve it is desired to make. Head 51 is then rotated about its horizontal axis to present the cutter bar in a vertical plane, and the turn table is swung to the right to bring the cutter bar into the position D. By swinging the cutter'bar about its then horizontal pivot 65 and intermittently moving the machine along the track and turning the turn table at steps indicated at D', D2, D3, D4, etc., the curved shear cut E for the room neck will be made. After the first series of shear cuts have been made, the coal is shot down and loaded out, and a section of curved track F extending from the straight entry track is laid. Increment G is then horizontally kerfed, and then the series of shearing 75 cuts as indicated at H, H', H2, etc., is made along the center line of the curved track. The shearing cuts D and I-I must be made step by step with the cutter bar swinging from the roof to the floor in order to make a curved rib as indicated.

It is also possible to make a shearing cut such as is designated at H, that is, with the machine on the curved track, by utilizing a single sumping, swinging, and withdrawing cycle to complete the cut. In operating according to this plan, the turn table is elevated as far as possible and the machine advanced to bring the forward end of the kerf cutter against the face adjacent the roof with the rear end of the cutter bar at about the same distance from the outer track rail as the forward end. The elevation of the turn table is for the purpose of bringing the cutter bar into as nearly perpendicular relation to the face as possible.

With the machine on a right hand curve, such as indicated in Figure 12, the cutter bar will be tilted from two to ten degrees by rotation of the head about its horizontal axis, the degree of tilting depending upon the curvature of the track. The smaller the radius of the curve, the greater will be the angle of tilting of the cutter bar.

Preferably, the bar will be tilted in a direction to bring its upper run nearer the inner track rail than the lower run, although the operation may be performed with the cutter bar tilted in the opposite direction with almost as satisfactory results.

With the parts thus disposed, the machine is advanced, as a whole, to sump the bar in the coal face. During the initial engagement of the bits with the face the turn table is locked against rotation about its vertical axis so as to prevent jumping or kicking, due to the reaction of the bits. After the initial engagement of the bits, the turn table may be unlocked and permitted to iioat freely on its vertical axis so as to prevent binding of the cutter bar due to the advance of the machine on the curved track. If preferred, however, the adjustment of the turn table about its vertical axis may be controlled by an operator in charge of the swinging apparatus. As a matter of convenience, in this respect, the turn table may be provided with the reversible swinging devices as disclosed in my copending application Serial No. 296,990, filed August 2nd, 1928, patent No, 1,857,853, granted July 19, 1932.

When the cutter bar has been completely sumped, the truck drive is thrown out and the cutter bar is oscillated about the axis dened f by shaft t6 to swing it downwardly until its forward end is adjacent the floor, whereupon it is withdrawn by a reversal of the sumping operation. With the cutter bar tilted in the desired direction, as discussed above, it will be evident that a shear cut will result which, as a whoie, is at an angle of from two to ten degrees to the vertical.

It has been assumed that, in making the cut just described, the machine is on a right hand curve. If vthe machine is on a left hand curve, the cutter bar will still lie on the same side of the horizontai axis of the head, in order to retain the same direction of chain travel, and the bar will be tilted to move the lower chain toward the outside rail, the degree of tilt being chosen for the right hand cut. The sumping, swinging, and withdrawing operations are then carried out as above described.

It will be understood that I do not limit myself to the illustrative embodiment of my invention herein described, but that the scope of my invention is determined in the following claims.

I claim:

1. In a machine of the class described, a support, a substantially horizontally extending cutter bar, a drive shaft for the cutter bar substantially perpendicular t0 the plane of the latter, mounting means for the cutter bar in connection with said support whereby the bar is swingable about an axis defined by said shaft and about another axis substantially perpendicular to said shaft, means for rotating said shaft, and gearing mechanisms driven from a single eccentric on said shaft for swinging said bar about both of said axes.

2. In a machine of the class described, a support, a substantially horizontally extending cutter bar, a drive shaft for the cutter bar substantially perpendicular to the plane of the latter, mounting means for the cutter bar in connection with said support `whereby the bar is swingable about an axis defined by said shaft and about another axis substantially perpendicular to said shaft, means for rotating said shaft, a separate worm wheel concentric with each of said axes, the worm wheel concentric with said axis perpendicular to said shaft being in fixed connection with said support, anda Worm engaging each of said wheels and driven from means on said shaft for moving said bar about both of its axis.

3. In a machine of the class described, a support, a substantially horizontally extending cutter bar, a drive shaft for the cutter bar substantially perpendicular to the plane of the latter, mounting means for the cutter bar in connection with said support whereby the bar is swingable about an axis defined by said shaft and about another axis substantially perpendicular to said shaft, means for rotating said shaft, a separate worm wheel concentric with each of said axes, the worm wheel concentric with said axis perpendicular to said shaft being in fixed connection with said support, a Worm engaging each of said wheels and driven from means on said shaft for moving said bar about both of its axes, and means for interrupting the drive from said last named means to one or both of said Worms.

4. In a machine of the class described, a support, a substantially horizontally extending cutter bar, a drive shaft for the cutter bar substantially perpendicular to the plane of the latter, mounting means for the cutter bar in connection with said support whereby the bar is swingable aboutv an axis defined by said shaft and about another axis substantially perpendicular to said shaft, means for rotating said shaft, a separate worm Wheel concentric with each of said axes, aworm engaging each of said wheels and driven from means on said shaft for moving said bar about both of its axes, and means for controlling the drive ratio from said last named means tc one of said worms.

5. In a machine of the class described, a support, a substantially horizontally extending cutter bar, mounting means for the cutter bar in connection with said support whereby the bar is movable relative to the support about two axes at right angles to each other, a sprocket shaft for the cutter bar journaled in said mounting means, gearing mechanisms for moving said bar about both of its axes, a rotary driving member journaled in said mounting means; and selectively operable -drive connections between said rotary member, said sprocket shaft and said gearing mechanisms, the drive connections between said rotary member and said gearing mechanisms including an eccentric coaxial with said rotary member.

6. In a machine of the class described, a support, a substantially horizontally extending cutter bar, mounting means for the cutter bar in connection with said support whereby the bar is movable relative to the support about two axes at right angles to each other, a sprocket shaft for the cutter bar journaled in said mounting means in coincidence with one of said axes, gearing mechanisms for moving said bar about both of said axes, a gear freely revoluble on said shaft, means for driving said gear, and selectively operable drive connections between said gear, said sprocket shaft and said gearing mechanisms, the drive connections between said gear and said gearing mechanisms including an eccentric on said gear.

7. In a machine of the class described, a support, a substantially horizontally extending cutter bar, mounting means for the cutter bar in connection with said support whereby the bar is movable relative to the support about two axes at right angles to each other, a sprocket shaft for the cutter bar journaled in said mounting means in coincidence with one of said axes, gearing mechanisms for moving said bar about both of said axes, a gear freely revoluble on said shaft, means for driving said gear, and selectively operable drive connections between said gear, said sprocket shaft and said gearing mechanisms, the drive connections between said gear and said gearing mechanisms including an eccentric on said gear and pawl and ratchet devices `driven by said eccentric.

8. In a machine of the class described, a support, a horizontally projecting arm secured to sai-d support, a shaft extending longitudinally of said arm and journaled therein, a motor on the support in driving connection with said shaft, a housing supported by the free end of said arm and rotatable about the axis of said shaft, a second shaft journaled in said housing at right angles to the first, gearing connecting said shafts, a cutter bar supported by said housing for swinging movement about said second shaft, a drive sprocket for the cutter bar on said second shaft, a worm gear fixed to said arm concentric with the first shaft, a worm gear in fixed connection with the cutter bar and concentric with the second shaft, worms journaled in bearings of said housing and respectively engaging said worm wheels, and controllable driving connections between means on said second shaft and each of said worms.

9. In a machine of the class described, a support, a horizontally projecting arm secured to said support, a shaft extending longitudinally of said arm and journaled therein, a motor on the support in driving connection with said shaft, a housing supported by the free end of said arm and rotatable about the axis of said shaft, a second shaft journaled in said housing at right angles to the first, gearing connecting said shafts, a cutter bar supported by said housing for swinging movement about sai-d second shaft,

drive sprocket for the cuter bar on said second shaft, a worm gear fixed to said arm concentric with the rst shaft, a worm gear in fixed c^nnection with the cutter bar and concentric h the second shaft, worms journaled in bearings of said housing and respectively engaging said worm wheels, and controllable driving connections between means on said second shaft and each of said worms, sai-d last named means comprising an eccentric.

10. In a machine of the class described, a sup- 5 port, a horizontally projecting arm secured to said support, a shaft extending longitudinally of said arm and journaled therein, a motor on the support in driving connection with said shaft, a housing supported by the free end of said arm 10 and rotatable about the axis of said shaft, a second shaft journaled in said housing at right angles to the first gearing connecting said shafts, a cutter bar supported by said housing for swinging movement about said second shaft, 15 a drive sprocket for the cutter bar on said second shaft, a worm gear fixed to said arm concentric with the first shaft, a worm gear iny fixed connection with the cutter bar and concentric with the second shaft, worms journaled 20 in bearings of said housing and respectively engaging said worm wheels, an eccentric on one of said shafts, and drive connections between said eccentric and said worms including Vpawl and ratchet devices driven by the eccentric. 25

1l. In a machine of the class described, a support, a horizontally projecting arm secured to sa'd support, a shaft extending longitudinally of said and journaled therein, a motor on said support in driving connection with said shaft, a 30 housing supported by said arm at its free end for rotation about the axis of said shaft, a second shaft journaled in said housing at right angles to the first, a gear fixed on the first shaft in driving engagement with a driven gear loose 35 on the second shaft, clutch means operable between the last named gear and shaft, a cutter bar supported by said housing for swinging movement about said second shaft, a drive sprocket for the cutter bar onK said second shaft, a worm 40 gear fixed to said arm concentric with the first shaft, a worm gear in fixed connection with the cutter bar and concentric with the second shaft, worms journaled in bearings of said housing and respectively engaging said worm wheels, a drive 45 element on said driven gear, and controllable driving connections between said .drive element and each of said worms.

12. In a machine of the class described, a support, a horizontally projecting arm secured to 50 said support, a shaft extending longitudinally of said arm and journaled therein, a motor on said support in driving connection with said shaft, a housing supported by said arm at its free end for rotation about the axis of said shaft, a sec- 55 ond shaft journaled in said housing at right angles to the first, a gear fixed on the rst shaft in driving engagement with a driven. gear loose on the second shaft, clutch means operable between the last named gear and shaft, a cutter 60 bar supported by said housing for swinging movement about said second shaft, a drive sprocket for the cutter bar on said second shaft,

a worm gear fixed to said arm concentric with the first shaft, a worm gear in fixed connection 55 with the cutter bar and concentric with the sec ond shaft, worms journaled in bearings of said housing and respectively engaging sai-d worm wheels, an eccentric on said driven gear, and controllable driving connections for each of said worms including pawl and ratchet devices driven by said eccentric.

13. In a machine of the class described, a shaft,

a driven gear revoluble on said shaft, clutch means for connecting said gear and shaft to drive the latter, a lever for controlling said clutch means, a xed toothed segment coaxial with said lever, a spring pressed latch mounted on said lever and engaging said segment, and releasing means for said latch comprising a lever pivoted there-to and roclrable on an axis coincident with that of the first lever.

lli. In a machine of the class described, a shaft, a driven gear revoluble on said shaft, clutch means for connecting said gear and shaft to drive the latter; and clutch controlling means including a tubular rock shaft, an operating lever fixed adjacent each end of said shaft, a fixed toothed segment concentric with said shaft adjacent one of said levers, a spring pressed latch mounted on said last nained lever and engaging said segment, a second rock shaft extending through said tubular shaft, an operating lever xed at each end of said second rock shaft, and an operating connection between said second rock shaft and said latch.

l5. In a machine of the class described, a support, a cutter bar swingably mounted relative to the support, means for swinging said bar including a pawl and ratchet device, means for controlling the throw of the pawl comprising a rotatable shield; and means for controlling the shield comprising a shaft in driving connection with the shield, a gear xed on said shaft, a drive gear engaging said gear, a third gear driven by the tiret in the opposite direction to the drive gear upon rotation of the latter, a pair of coaxially mounie spur gears of equal size, transmission means between one of said spur gears and said drive gear and between the other of said spur gears and said third gear, and a pinion engaging the one spur gear to rotate the same to adjust the shield and thereby cause reverse rotation of the other spur gear, said pinion being shiftable in the direction of said spur gears to engage them both and lock them against relative rotation.

16. In a machine of the class described, a support, a cutter bar swingably mounted relative to the support, means for swinging said bar includa pawl and ratchet device, means for controlling the throw of the pawl comprising a shield ixed on a rotatable stud coaxial with the ratchet, a bevel gear fixed on said stud, a rotatable hollow shaft at right angles to the stud and having xed thereto a bevel gear meshing with the first, a shaft rotatable in said hollow shaft and having fixed thereto a bevel gear opposed to the second and meshing with the first, a pair of coaxially mounted spur gears of equal size, gearing connecting one of said spur gears and one of said shafts, gearing connecting the other of said spur gears and the other of said shafts, and a pinion engaging the one spur gear to rotate the same to adjust the shield and thereby cause reverse rotation of the other spur gear, said pinion being shiftable in the axial direction of said spur gears to engage them both and lock them against re1- ative rotation.

i7. In a machine of the class described, a support, a cutter bar pivotally mounted on the support, and means for moving said bar about its pivot including a ratchet wheel, a member oscillable about the axis of said wheel and having a radial bore, a plunger in said bore having a pawl tooth cooperable with said wheel, means yieldingly urging said tooth into engagement with said wheel, a handle'in connection with said plunger liftabie against the yielding means to disengage said tooth from said wheel and swingable to turn said tooth to reverse its operation relation to the wheel, and abutment means cooperable with the handle to maintain the tooth out of engagement with the wheel.

18. In a machine of the class described, a support, a cutter bar pivotally mounted on the support, and means for moving said bar aboutits pivot including a substantially self-locking worm and worm wheel, and means for precluding overrunning of the worm by the worm wheel including spring pressed frictional braking means a-cting on the worm at one extremity thereof and in the axial direction thereof.

19. In a machine of the class described, a movable base, a support mounted on said base for swinging movement relative thereto about a normally vertical axis and also for universal tilting movement relative thereto, a substantially horizontally extending cutter bar, mounting means for the cutter bar in connection with the support whereby the bar 'novable relative to the support about a plurality of rectangularly related axes of which one is substantially on the horizontal, means operable to tilt the support, means operable to swing the support, means operable to move the cutter bar about said plurality of axes, and a motor on. said support for driving the support swinging means and the cutter bar moving means.

20. In a machine of the class described, a truck adapted to travel over a mine track, a turn table, means supporting said turn table on said truck for rotation relative to the truck on a normally vertical axis and also for universal tilting movement relative to the truck, an arm xed to the turn 'table and projecting horizontally therefrom, a lrerf cutter supported by said arm for movement relative thereto about a plurality of rectangularly related axes of which one is substantially on the horizontal, means operable to tilt the turn tabl-e, means operable to swing the turn table, means operable to inove the cutter bar about said plurality of axes, and a motor on the turn table for driving the turn table swinging means and the cutter bar moving mean-s.

2l.. In a machine of the class described, a truck adapted to travel over a mine track, a turn table, means supporting said turn table on said truck for rotation relative to thetruck. on a normally vertical axis and also for universal tilting movement relative to the truck, an arm fixed to the turn table and projecting horizontally thereiroin, a rotatable shaft extending longitudinally of said arm, a head mounted on said arm and rotatable about said shaft as an axis, a shaft journaled in said head at right angl-es to the first mentioned shaft, a cutter bar supported by said head for swinging movement about the second-named shaft, a cutter chain drive sprocket on said second named shaft to be driven thereby, a motor on said turn table; means driven by the motor to swing the turn table, to drive the sprocket shaft, to rotate said head relative to said arm, and to swing the cutter bar relative to the head; and means operable to tilt the turn table.

22. The method of developing a shearing out in a rib which comprises circulating a cutting instrumentality in a horizontally elongated substantially vertical orbit, sup-porting instrumentality from one end of the orbit for oscillation about a forward axis normal to the plane of the orbit and a rearward vertical axis, arranging the orbit at an acute substantially horizontal angle to the rib with its distal end in such proximity thereto as to enable the cutting instrumentality to engage the rib, displacing the cutting instrumentality about said forward axis to form a cut of the desired height, returning the instrumentality about said forward axis to its initial position, displacing said cutting instrumentality through movement of the rearward axis a distance in a direction parallel to the rib to increase the .angle of the orbital plane thereto and to advance the instrumentality therein, and alternately repeating the described displacements of the cutting instrumentality to form progressive cuts in the rib whereby a kerf is developed bounded laterally by outwardly divergent walls.

23. rThe method of developing a shearing cut in a rib which comprises circulating a cutting instrumentality in a horizontally elongated substantially vertical orbit, supporting said instrumentality from one end of the orbit for oscillation about a forward axis normal to the plane of the orbit and a rearward vertical axis, arranging the orbit at an acute substantially horizontal angle to the rib with its distal end in such proximity thereto as to enable the cutting instrumentality to engage the rib, displacing the cutting instrumentality about said forward axis to form a cut of the desired height, returning the instrumentality about said forward axis to its initial position, displacing said cutting instrumentality through movement of the rearward axis a distance in a direction parallel to the rib to increase the angle of the orbital plane thereto and to advance the instrumentality therein, and alternately repeating the described displacements of the cutting instrumentality to form progressive cuts-in the rib whereby a kerf is developed bounded laterally by ,a horizontally curved wall.

2li. The method of developing a shearing cut in a mine wall which comprises circulating a cutting instrumentality in a horizontally elongated vertical orbit, supporting said instrumentality from one end of the orbit for oscillation about a forward 4axis normal to the plane of the orbit and a rearward vertical axis, arranging the orbit at an acute substantially horizontal angle to the mine wall with its distal end in such proximity thereto as to enable the cutting instrumentality to engage the wall, displacing the cutting instrumentality about said forward axis to form a cut of the desired height, returning the instrumentality about said forward axis to its initial position, displacing the instrumentality through movement of said rearward axis a distance toward the wall on a predetermined horizontal curve to increase the angle of the orbital plane thereto and to advance the cutting instrumentality therein, and alternately repeating the described displacements to form progressive cuts in the wall whereby a keri is developed bounded laterally by outwardly divergent surfaces.

25. rf'he method of developing a shearing cut in a mine wall which comprises circulating a cutting instrumentality in a horizontally elongated orbit inclined from substantially 2 to 10 to the vertical, supporting said instrumentality from one end of the orbit for oscillation about a forward axis normal to the plan-e of the orbit and a rearward vertical axis, arranging the orbit at an acute sibstantially horizontal angle to the mine wall with its distal end in such proximity thereto as to enable the cutting instrumentality to engage the wall, displacing the cutting instrumentality through movement of said rearward axis a distance toward the wall on a predetermined horizontal curve to increase the angle of the orbital plane thereto through oscillation about said rearward axis and to sump the cutting instrumentality in the wall, displacing the cutting instrumentality about the forward axis of the orbit to form a cut of the desired height, and withdrawing the cutting instrumentality by a return movement on said curve. 5

26. The method of developing a shearing cut in a mine wall which comprises circulating a cutting instrumentality in a horizontally elongated Orbit inclined from substantially 2 to 10 to the Vertical, supporting said instrumentality from one end of the orbit for oscillation about a forward axis normal to the plane of the orbit and a rearward vertical axis, arranging the orbit at an acute substantially horizontal angle to the mine wall with its distal end in such proximity thereto as to enable the cutting instrumentality to engage the wall, displacing the cutting instrumentality through movement of said rearward axis a distance toward the wall on ,a predetermined horizontal curve to increase the angle of the orbital plane thereto through free oscillation about said rearward axis and to sump the cutting instrumentality in the wall, displacing the cutting instrumentality about the forward axis of the orbit to form a cut of the desired height, and withdrawing the cutting instrumentality by a return movement on said curve.

27. In a mining apparatus, a wheeled truck adapted to run along a trackway, a motor thereon for driving the truck wheels, a horizontal turntable mounted on said truck, mechanism driven by said motor for bodily adjusting said turntable into different elevated positions relative to said truck and for universally tilting said turntable relative to said truck, kerf cutting mechanism supported on said turntable including a cutter head rotatable about a longitudinal axis and a cutter chain carrying cutter bar pivotally mounted on said cutter head, a motor on said turntable, and mechanism driven by said motor for actuating said cutter chain, for rotating said cutter head about its axis relative to said turntable and for swinging said cutter bar about its pivot relative to said cutter head while said turntable remains stationary. 28. In a mining apparatus, a wheeled truck adapted to run along a trackway, a horizontal turntable thereon, motor operated devices for bodily adjusting said turntable into dierent elevated positions relative to said truck and for universally tilting said turntable relative to said truck, kerf cutting mechanism mounted on said turntable including a cutter head rotatable about a longitudinal axis and a cutter bar pivotally mounted on sai-d head for swinging movement relative thereto, and motor operated devices for rotating said cutter head about its axis relative to said turntable and for swinging said cutter bar about its pivot relative to said cutter head while said turntable remains stationary.

29. In a machine of the class described, a support, a substantially horizontally extending cutter bar, mounting means for the cutter bar in connection with said support whereby the bar is movable relative to the support about two axes at right angles to each other, a m-ain drive shaft disposed on one of said axes, a cutter bar drive shaft disposed on the other of said axes, and power transmitting means for moving the cutter bar about both of said axes and for driving the cutter bar drive shaft from said main shaft, said power transmitting means comprising a drive gear on said main drive shaft, a driven gear carried by said mounting means in engagement with said .drive gear, slow speed gearing connectible with said driven gear to swing the cutter bar about the axis of said cutter bar drive shaft at a slow cutting speed, gearing connectible with said driven gear to swing the cutter b-ar about the axis of said main shaft simultaneously with the swinging of the cutter bar about its other axis at cutting speed, and means for effecting drive of said cutter bar drive shaft from said gear.

30. In a machine of the class described, a support, a substantiallyhorizontally extending cutter bar, mounting means for the cutter bar in connection with said support whereby the bar is movable relative to the support about two axes at right angles to each other, a main .drive shaft disposed on one of said axes, a cutter bar drive shaft disposed on the other of said axes, and power transmitting means for moving the cutter bar about both of said axes and for driving the cutter bar drive shaft from said main shaft, said power transmitting means comprising a drive gear on said main drive shaft, a driven gear carried by said mounting means in engagement with said drive gear, slow speed gearing connectible with said driven gear to swing the cutter bar about the axis of said cutter bar drive shaft at a slow cutting speed, gearing connectible with said driven gear to swing the cutter bar about the axis of said main shaft in either' direction simultaneously with the swinging of the cutterbar about its other axis at cutting speed, and means for effecting drive of said cutter bar drive shaft from said'gear.

31. In a machine of the class described, a sup- ,IpOrt, a substantially horizontally extending cutter bar, mounting means for the cutter bar in connection with said support whereby the bar is movable relative to the support about two axes atright angles to each other, a main drive shaft disposed on one of said axes, a cutter bar drive shaft disposed on the other of said axes, and power transmitting means for moving the cutter bar about both of said axes and for driving the cutter b-ar drive shaft from said main shaft, said I, p ower transmitting means comprising va drive gear on said main Idrive shaft, a driven gear carried .by said mounting means in engagement with said drive gear, slow and fast speed gearing connectible,` with said driven gear to swing the cutter f bar about the axis of said cutter bar drive shaft at alslow cutting speed or at a fast adjusting speed, gearingi connectible with said driven gear to swing the cutter bar about the axis of said main shaft simultaneously with the swinging of the cutter bar about its other axis at cutting Speederadjusting speed, and means for effecting drive o f said cutter bar drive shaft from said gear.

32 Ina machine of the class described, a support, a substantially horizontally extending cutterfbar, mounting means for the cutter bar in connection with said support whereby the bar is ing connectiblewith said drivenA gear to swingA the cutter bar about the axis of said cutter bar.

drive shaft at a slow cutting speed or ata fast adjusting speed, gearing connectible with said driven gear to swing the cutter bar about the axis of said main shaft in either direction simultaneously with the swinging of the cutter bar 5 about its other axis at cutting speed vor adjusting speed, and means for effecting drive of said cutter bar drive shaft from said gear.

33. In a machine of the class described, a support, a head carried by said support and rotatable relative thereto about a normally substantially. horizontal axis, a cutter bar carried by said head and swingable relative thereto about an axis substantially perpendicular to the rst named axis,

a drive member carried by said head; and driving connections conned to the head for rotating the head, for swinging the cutter bar, and for driving the cutter bar; said connectionsV including slow speed gearing mechanism connectible to said drive member for swinging the cutter bar at a slow cutting speed, gearing mechanism connectible to said drive member for rotating the head simultaneously with the swinging of the cutter bar at cutting speed, and means for effecting drive of the cutter bar from said drive z5v member.

34. In ay machine of the class described, a support, a head carried by said support and rotatable relative thereto about a normally substantially horizontal axis, a cutter bar carried by said head v and swingable relative thereto about an axis substantially perpendicular to the rst n-amed axis,

a drive member carried by saidhead; and driving connections confined to the head for rotating the head, for swinging the cutter bar, and for drivingthe cutter bar; said connections including slow speed gearing mechanism connectible to said drive member for swinging the cutter bar at a slow cutting speed, gearing mechanism connectible to sai-d drive member for rotating the head in either direction simultaneously with the swinging of the cutter bar at cutting speed, and means for effecting drive of the cutter bar from said drive member.

35. In a machine of the class described, a supr port, a head carried by said support and rotatable relative thereto about a normally substantially horizontal axis, a cutter bar carried by saidhead and swingable relative thereto about an axis-substantially perpendicular to the first named axis, a drive member carried by said head; and driving connections confined to the head for rotating the head, for swinging the `cutter bar, and for driving the cutter bar; said connections` including slow and fast speed gearing mechanism connectible to said drive member for swinging the cutter bar at a slow cutting speed or at a fast adjusting speed, gearing mechanism connectible to said -drive member forrotating the head simultaneously with the swinging of the cutter bar at cutting speed, and means for effecting drive of thek cutter bar from said drive member.

36. In a machine of the class described, a support, a head carriedv by said support and rotatable relative thereto about a normally substantially horizontal axis, a cutter bar carried by said head and swingable relative theretov about an axis Vsubstantially perpendicular to the firstv named axis,v a drive member carried by said A head; and drivingv connections confined to the head for rotating` the head, for swinging the cutterv bar, and `for driving the cutter bar; said connections including slow and fast speed gearing; mechanism connectible to said drive member for swinging the cutter bar at a slow'cutting speed or at a fast adjusting speed, gearing mechanism connectible to said drive member for rotating the head in either direction simultaneously with the swinging of the cutter bar at cutting speed, and means for effecting drive oi the cutter bar from said drive member.

37. In a mining machine, the combination with an elongated kerf-cutter comprising a cutter bar "?with an endless chain cutter on the periphery thereof, of a truck comprising wheels adapted to travel along a mine track, a turntable mounted on said truck, means for adjusting the elevation and inclination of said turntable to secure 'Vuniversal tilting thereof at various elevations, means for supporting said cutter bar on said turntable for adjustment relative thereto on rectangularly related axes one of which is permanently at right angles to the cutter bar andV 'the other of which extends horizontally radially from said turntable in xed relation thereto, means for adjusting said kerf-cutter on said horizontal axis from an undercutting position or an overcutting position to an upright or shearfing position, truck propelling mechanism for moving the whole machine at a feeding speed along a curved track while said kerf-cutter is inclined at asmall angle from the Vertical to effect a sumping shearing out into the working @face adjacent to the mine track, and means for swinging the kerf-cutter on its right angle axis to eifect an arcuate kerf, While the machine is stationary on the mine track.

38. In a mining machine, the combination with l 'a wheeled truck adapted to travel on a mine track, of a turntable adjustably mounted on said truck, an elongated kerf-cutter comprising a cutter bar and an endless chain cutter thereon, means for supporting said cutter bar on said turntable for adjustment relative thereto on rectangularly related axes one of which is permanently at right angle-s to the cutter bar and the other of which is horizontal and radial of said turntable, means for adjusting the kerf-cutter on said horizontal axis to a shear cutting position, means for universally tilting said turnf.

table to adjust the inclination of said radial axis, and self-contained power-operated mechanism for sumping the kerf-cutter into a coal 5o Vvface, feeding the kerf-cutte-r arcuately and transversely in the same plane and withdrawing the kerf-cutter to effect the cutting of a parallel ribbed kerf in a direction approximately in alinement with a curved mine track. ki 39. In a mining machine, the combination with a wheeled truck adapted to move along a mine track, oi" a turntable mounted thereon for rotation relatively thereto on a vertical axis and for universal tilting movement relative thereto, van elongated kerf-cutter comprising a cutter bar with an endless chain cutter thereon, means for supporting said cutter bar on said turntable for adjustment relatively thereto on rectangularly related axes one of which is perma- `'nently at right angles to said cutter bar and the other of which is radial of said turntable and in fixed relation thereto, means operable to tilt said turntable to adjust the inclination of said radial axis, means operable to adjust said kerfv fcutter on said radial axis, a motor on said turntable, power-transmission mechanism between said motor and said chain cutter to drive the same and to effect swinging feeding movement of said kerf-cutter on said right angle axis, and power-operated mechanism for moving the Whole machine along the mine track at a feeding speed.

40. In a machine of the class described, a wheeled frame adapted to be positioned on and travelrover a mine track, a support carried by said frame for swinging movement relative there- 5 to about a normally vertical axis and also for universal tilting movement relative thereto, a chain-carrying cutter bar pivotally carried by said support for swinging movements completely about a normally horizontal axis whereby the 10 cutter bar is positionable to cut horizontal or vertical kerfs and also for swinging movements about an axis at substantially right angles to said horizontal axis to effect a cutting feed, the plane of the cutter bar being offset from said 15 horizontal axis, means for releasably locking said support in desired relation to its swinging axis; and means for tilting said support, for swinging the cutter bar about both of its axes, and for driving the cutter chain.

41. In a machine of the class described, a wheeled frame adapted to be positioned on and travel over a mine track, a support carried by said frame for swinging movement relative thereto about a normally vertical axis and also for g5 universal tilting movement relative thereto, a chain-carrying cutter bar pivotally carried by said support for swinging movements completely about a normally horizontal axis whereby the cutter bar isV positionable to cut horizontal or 30 vertical kerfs and also for swinging movements about an axis at substantially right angles to said horizontal axis to effect a cutting feed, the plane of the cutter bar being oiset from said horizontal axis; and means for swinging and tilting said 35 support, for swinging the cutter bar about both of its axes, and for driving the cutter chain.

42.111 a machine of the class described, a wheeled frame adapted to be positioned o-n and travel over a mine track, a support carried by 40 said frame for swinging movement relative thereto on an upright axis and for universal tilting movement relative to said frame, means for locking said support against swinging movement about said axis, said means being releasable 45 to permit free iioating of said support about said axis, a turnover head carried by said support,

a chain-carrying cutter bar carried by said head for swinging movement relative thereto about an axis substantially perpendicular to the head 5@ axis; and means for turning said head about its axis, for swinging said cutter bar about said axis which is perpendicular to the head axis, for tilting said support, and for driving the cutterl chain. 55

43. In a machine of the class described, a wheeled frame adapted to be positioned on and travel overa mine track, an arm normally projecting substantially horizontally from said frame, a head on the outer end of said arm and 60 rotatable relative thereto about an axis extending longitudinally of said arm, a worm wheel concentricwith said axis and a worm engaging said wheel, one of said last-named elements being mounted on said arm and the other on said head 55 so that upon rotation of the worm the head may be completely rotated about its axis relative to the arm, a chain-carrying cutter bar pivotally supported by said head for swinging movement about an axis substantially perpendicular to the 70 head axis, the arrangement of the cutter bar being such as to enable it to be revolved completely about the head axis upon rotation of the head, the plane of the cutter bar being offset from said head axis, a worm wheel xed to said cut- 75:

of. s

ter bar concentrically with the pivotal axis of the latter, a worm journaled in said head and engaging said last named worm wheel to drive the latter and thereby swing the cutter bar, the worm wheels and their associated worms being selflocking, a rotary member in said head, means drivable from said rotary member for rotating the worms in either direction, and means drivable from said rotary member for driving the cutter chain.

44. In a machine of the class described, a wheeled frame adapted to be positioned on and travel over a mine track, an arm normally projecting substantially horizontally from said frame, a head on the outer end of said arm and rotatable relative thereto about an axis extending longitudinally of said arm, a worm wheel concentric with said axis and a worm engaging said Wheel, said worm wheel being iixed on said arm and the worm being journaled in said head so that upon rotation of the worm the head may be completely rotated about its axis relative to the arm, a chain-carrying cutter bar pivotally supported by said head for swinging movement about an axis substantially perpendicular to the head axis, the arrangement of the cutter bar being such as to enable it to be revolved completely about the head axis upon rotation of the head, the plane of the cutter bar being offset from said head axis, a worm Wheel xed to said cutter bar concentrically with the pivotal axis of the latter, a worm journaled in said head and engaging said last-named worm Wheel to drive the latter and thereby swing-the cutter bar, the worm wheels and their associated worms being selflocking, means for rotating the Worms in either direction, and means for driving the cutter chain, the means for rotating the worms including a motor and a drive train extending therefrom along said arm to said head.

45. In a machine of the class described, a wheeled frame adapted to be positioned on and travel over a mine track, an arm normally projecting substantially horizontally from said frame, a head on the outer end of said arm and rotatable relative thereto about an axis extending longitudinally of said arm, a Worm Wheel concentric with said axis and a worm engaging said wheel, said worm wheel being fixed on said arm and the worm being journalled in said head so that upon rotation of the worm the head may be completely rotated about its axis relative to the arm, a chain-carrying cutter bar pivotally supported by said head for swinging movement about an axis substantially perpendicular to the head axis, the arrangement of the cutter bar being such as to enable it to be revolved completely about the head axis upon rotation of the headand the plane of the cutter bar being offset from said head axis, a worm wheel fixed to said cutter bar concentrically with the pivotal axis of 15 the latter, a worm journaled in said head and engaging said last named Worm Wheel to drive the latter and thereby swing the cutter bar, the Worm wheels and their associated worms being self-locking, a rotary member in said head, means drivable from said rotary member for rotating the worms in either direction, and means drivable from said rotary member for driving the cutter chain.

46. In a mining machine, the combination with g5 a wheeled supporting frame adapted to travel along' a mine track and be braced thereby, of a turntable mounted on said frame for pivotal movement relative thereto on an upright axis, a chain kerf-cutter comprising an elongated cutter bar, a turnover head carried by said turntable for adjustment relative thereto on a horizontal axis, mechanism for supporting said cutter bar on said head for adjustment relative thereto on an axis perpendicular to said horizontal axis, motor driven mechanism for driving said chain cutter, means connected to said motor driven mechanism to effect turning of said head about said horizontal axis and the swinging of said cutter bar about said axis which is perpendicular to o the head axis, power operated mechanism for swinging the turntable on said upright axis relative to said frame, and means independent of said last-named swinging mechanism for locking the turntable relative to said frame. 5

NILS D. LEVIN.

CERTIFICATE OF CORRECTION.

Patent No. 2,021,664. November 19, 1935.

NILS D. LEVIN.

It is hereby Certified that error appears in the printed specification cf the above numbered patent requiring Correction as follows: Page 5, first column, line '71, after "which" insert a comma; page' 4, first column, line 26, for "bearings" read bearing; page 5, second column, line 32, claim 2, for "axis" read axes; page 6, first column, line '70, claim 9, for "outer" read cutter; page '7, second Column, line 61, claim 2l, strike out the comma after "tab1e"; page lO, second column, line 46, Claim 42, for "fioating" read floating; and that the said Letters Patent should be read with these Corrections therein that the same may conform to the record of the ease in the Patent Office.

Signed and sealed this 28th day of January, A. D. 1936.

Leslie Fraze r (Seal) Acting Commissioner of Patents.

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