US2166569A - Mining machine - Google Patents

Description

18', 1939. l cH L 2,166,569

MINING MACHINE Original Filed May 2, 1932 10 Sheets-Sheet 1 /NVENTOR: Lewis E. Mifche/l ATT 'Y y 1939. E. MITCHELL 2,166,569

MINING MACHINE Original Filed May 2, 1932 10 Sheets-Sheet '2 INVENTOR: Lew/'5 E. Mhchel/ HTT'Y July 18, 1939.

L. E. MITCHELL 2,166,569

MINING MACHINE Original Filed May 2, 1932 10 Sheets-Sheet 3 um (0 5 u- 8 h \9 -J P '//'Z/ [4. F I// H K w -m :2 Q I g 3 g .x E :0

P m w 'I 5 2 I I Q g 4& r n n 3 1s} 9 E N n r \11 v //-/vE/-/T0R: g Lewis E. M/fchel/ B a 3 HTT'Y July 18, 1939. L. E. MITCHELL MINING MACHINE Original Filed May 2; 1932 10 Sheets-Sheet 4 ATT'Y.

July 18, 1939. L. E. MITCHELL MINING MACHINE l0 Sheets-Shept 5 Original Filed May 2, 1932 G l a 7 e m E: y R 0 M m m J F E E :3. V 5 M Y e L B. n. 4 m l m E s l'ul\\ HTT'Y y 1939- L. E. MITCHELL 2,166,569

MINING MACHINE Original Filed May 2, 1932 10 Sheets-Sheet 6 3 /NVENTOF?: )1 Lewis E. Mifchell,

' HTT'Y E. MITCHELL MINING MACHINE July 18, 1939.

Original Filed May 2, 1932 10 Sheets-Sheet 7 I 10 sheet-sneeig a July 18, 1939. E. MITCHELL MINING MACHINE Original Filed May 2, 1932 k. on

y 1939. E. MITCHELL I 2,166,569

MINING MACHINE Original Filed May 2, 1932 10 Sheets-Sheet 10 I45 El 25' 4 e7 v 1: a GI 27 Z a-r 6 E k as 36 1 //Yl/ENTOR.' V

. 5 w a HT 'Y Patented July 18, 1939 UNITED STATES PATENT OFFICE MINING MACHINE poration of Ohio Application May 2, 1932, Serial No. 608,585 Renewed March 8, 1939 40 Claims.

My invention relates to mining machines particularly of the type adapted to travel on a mine track and remain thereon to be braced thereby during operation.

One of the objects of my invention is the provision of an improved and efficient mining machine which shall have a minimum overall height and be Very compact to operate in a relatively low roof mine chamber.

Another object of the invention is the provision of improved and efiicient mechanism for supporting and adjusting a Keri-cutter on a horizontal axis from a horizontal plane at the level of the mine floor to a horizontal plane above the mining machine but adjacent the same for operation in a relatively low roof mine chamber. A further object of the invention is the provision of improved mechanism for detachably mounting a self-contained power-operated drilling machine on the outer end portion of an elongated cutter bar which is adjustably mounted on a truck adapted to travel on a mine track so that Whenever desired the mining machine may be used to support the drilling mechanism in any one of many different positions at the coal face.

Another object of the invention is the provision of a demountable drill on a mining machine cutter bar so that the various adjustments of the cutter bar may be taken advantage of to support the drilling mechanism in position to command the entire area of the working face.

Another object of the invention is the provision of a universally mounted drill on a universally mounted elongated support to efiect adjustment of the drill for operation universally with respect to the coal face and with respect to the ribs at the sides of the mine entry in which the machine is adapted to operate.

Other objects of the invention will appear hereinaiter, the novel features and combinations being set forth in the appended claims.

In the accompanying drawings Fig. 1 is an elevational view of my improved mining machine including the self-contained power-operated drilling mechanism demountably attached to the outer end portion of the elongated cutter bar;

Fig. 2 is a plan View of the complete mining machine shown in Fig. 1 showing the mechanism for swinging the cutter bar and adjusting the position of the drill on the vertical axis of the turntable;

Fig. 3 is a bottom plan View of the structure shown in Figs. 1 and 2. to show the power-operated mechanism for varying the elevation of the cutter bar and the drill relative to the truck on which the turntable is mounted;

Fig. 4 is a detailed view of the individual screw post elevating mechanism for the turntable, including an individual controlling clutch to secure variation of inclination of the cutter bar and the drill on either a longitudinal axis of the turntable or a horizontal transverse axis thereof;

Fig. 5 is a longitudinal enlarged sectional elevation of that portion of the mining machine shown in Fig. 1 which embodies the turret for swinging the cutter bar on a lowered horizontal longitudinal axis combined with an additional turret for swinging the cutter bar in its own plane and thereby adjusting the drill when the latter is mounted on the outer end portion of the cutter bar;

Fig. 6 is an enlarged plan view of the righthand portion of the structure shown in Fig. 5;

Fig. 7 is a sectional elevation of the controlling mechanism shown in plan at the upper lefthand portion of Fig. 6;

Fig. 8 is the sectional plan view taken on the line 8-8 of Fig. 7

Figs. 9 and 10 are more or less diagrammatic views to illustrate the power transmission and control mechanism for swinging the turrets on their respective axes;

Fig. 11 is an enlarged sectional elevation taken as indicated by the line H--l| of Fig. 9 looking in the direction of the arrows;

Fig. 12 is an enlarged sectional elevation taken as indicated by the line I2l2 of Fig. 9 looking in the direction of the arrows;

Fig. 13 is an enlarged sectional elevation to show the clutch controlling mechanism for the power transmission from the motor on the turntable to the turret rotatable on the horizontal axis shown in Fig. 5;

Fig. 14 is an elevational view of the manual mechanism for operating the disc clutch shown in Fig. 13;

Fig. 15 is a sectional elevation taken on the line l5l5 of Fig. 14 looking in the direction of the arrows;

Fig. 16 is a sectional elevation taken on the line Iii-16 of Fig. 14 looking in the direction of the arrows;

Fig. 17 is an elevation of a self-contained power-operated drilling machine detachably mounted on the cutter bar of the keri-cutting mining machine shown in Fig. 1; I

Fig. 18 shows an outer end view of the drilling machine shown in Fig. 1'7 with the demountable attaching mechanism and the cutter bar in sectional elevation on the line |8--|8 of Fig. 1'7 looking in the direction of the arrows;

Fig. 19 is a diagrammatic plan view to illustrate various positions of the drill when the cutter bar occupies a horizontal plane;

Fig. 20 is a diagrammatic plan view to illustrate the various positions of the drill when the cutter bar occupies a vertical plane;

Fig. 21 is a diagrammatic elevational view to illustrate the various adjustments in elevation of the drill when the cutter bar is in a vertical plane;

Fig. 22 is a diagrammatic elevational view to illustrate adjustment of the drill by inverting the cutter bar from a horizontal plane adjacent the top of the machine to a horizontal plane at the floor of the mine chamber in advance of the mine track;

Fig. 23 is a diagrammatic elevational view to illustrate the adjustment of the drill from its lowest position to its highest position by inverting the cutter bar from its lower horizontal position to its upper horizontal position when the turntable is elevated to its highest position;

Fig. 24 illustrates diagrammatically adjustment of the drill to a position spaced back from the face of a rib and parallel thereto; and

Fig. 25 is a diagrammatic illustration of adjustment of the drill for operation at right angles to a rib extending parallel to the mine track.

By referring to Figs. 1 and 2 it will be seen that the kerf cutting mining machine which may be converted into a drilling machine by detachably mounting the self-contained power-operated drill 26 on the outer end portion of the cutter bar 21 comprises a truck frame 28 mounted on wheels 29, 29 which are adapted to travel on the mine track 30 and be laterally braced thereby during feeding movements of the cutter bar while the drilling machine 26 is demounted therefrom. The kerf cutting machine may be of the type shown in the Levin patent, No. 1,354,054, granted September 14, 1920, for an Improvement in mining machines, which includes a turntable, a cutter bar connected thereto to rotate therewith on an upright axis, mechanism for swinging the turntable and the cutter bar on such upright axis relatively to the truck and power-operated mechanism for varying the elevation and inclination of the turntable and the cutter bar relative to the truck.

The kerf cutting mining machine shown in Fig. 1 also includes apparatus operated by an electric motor 3| on the truck frame 28 for propelling the mining machine along the mine track 30 at a transport speed or at a slow feeding speed. A motor 32 is mounted on the turntable 33 to rotate bodily therewith and is connected to rope gearing comprising the rope 34 for swinging the turntable together with the cutter bar relatively to the truck on the upright axis of the turntable.

The truck propelling mechanism is shown in bottom plan view in Fig. 3 and comprises the sprocket chain 3! to which the motor 3| is connected through the speed reduction gearing 3|". The motor 3| on the truck frame 38 is also connected to the cable reel 35 which pays out or winds up the electric cable 36 for conducting electric power from a distant source of supply to the motor 3| on the truck, the motor 32 on the turntable and the motor 31 of the drilling machine shown in elevation in Figs. 1 and 17.

The mechanism for elevating the turntable together with the cutter bar and the drilling machine mounted on the latter is shown in Fig, 3 and comprises the sprocket chain 38 for rotating the vertical screw posts 39, 39, 39. Power may be transmitted to these screw posts individually as shown in Fig. 4 so as to effect variation of inclination of the turntable, the cutter bar, and the drilling machine on either a longitudinal axis of the turntable or a horizontal transverse axis thereof.

The armature shaft 40 of the motor 32 on the turntable extends horizontally forward and radially of the turntable as shown in Fig. 2.

At the forward end of the armature shaft 40 as shown in Fig. is a bevel pinion 4| which meshes with a horizontal bevel gear 42 secured to the vertical shaft 43 which is journalled in the bearing 44 of the auxiliary frame 45 rigidly secured to the turntable 33. Secured to the upper end of the vertical shaft 43 is a bevel gear 46 which meshes with a bevel gear 41 mounted on the left-hand end of the horizontal shaft 48 journalled in the frame 45. The bevel gears 46, 4! may be lubricated by oil from the closed chamber 48 through the nozzle 49. The journal bearings for the horizontal shaft 48 may be lubricated by oil from the closed chambers 50, 5| through the oil holes 52, 53. A cover plate 54 closes the chambers 48, 50 and 5| and the lubricant in these chambers may be replenished by removing the screw plugs 52, 53 and 54.

At the right-hand end of the horizontal shaft as viewed in Fig. 5 is secured a gear 55 which meshes with a gear 56 on the left-hand end of the shaft 51 which is offset from the horizontal shaft 48 but is in the same vertical plane therewith whether or not the cutter bar is in a horizontal plane. The axis of the shaft 51 is also offset from the horizontal axis of the motor shaft 40.

As will be hereinafter explained the shaft 5'! is journalled in the turret frame 58 which is rotatable relatively to the auxiliary frame 45 on the horizontal axis of the shaft 51. At the right-hand end of the shaft 51 is a bevel gear 59 which meshes with the horizontal bevel gear 60 as viewed in Fig. 5. The gear 60 is journalled loosely on the shaft 6| and the latter is journalled in the bearing 62 of the cap 63 secured to the turret 58. The shaft 6| is also journalled at its lower portion in the bearing 64 which is secured rigidly to the second turret frame 65. The second turret B5 is mounted for rotation on the axis of the shaft 6| relatively to the first turret 58.

Rigidly connected to the lower end of the turret 65 is the cutter bar 21 in position to occupy a plane at right angles to the axis of the shaft 6|. Guided along the periphery of the elongated cutter bar 21 is an endless cutter chain 66 which meshes with the driving sprocket 61 secured to the lower end of the shaft 6|. By means of the clutch 68 the bevel gear 60 may be connected to the shaft 6| to drive the sprocket 61 and the chain cutter 66. The clutch 68 may be manually operated from either side of the machine by means of one of the levers 69, 69 shown in Figs. 1 and 6. By moving one of the levers 69 the rockshaft will actuate the shipper H to throw the clutch 68 in or out, as shown in Fig. 5.

In order to rotate the turret 58 on the horizontal axis of the shaft 51 power transmission mechanism is arranged between the gear 55 and the worm gear 12 which is rigidly connected to the turret frame 53. By referring to Fig. which is a sectional view taken on the line |5--|5 of 1 cover plate.

Fig. 5 looking in the direction of the arrows or on the line I5-I5 of Fig. 14 looking in the direction of the arrows, it will be seen that the gear 56 meshes with an idler 12 and that the latter meshes with a gear 13 which in turn'may be connected to the shaft 14 by means of the friction clutch 15 as shown in Fig. 13.

The friction clutch 15 may be thrown in or out by means of the lever 16 as shown in Fig. 14. The lever 16 is pivoted at 11 and is provided with an adjustable screw 18 held in fixed position by the nut 19 so as to engage the upper end of the actuating arm which is urged against the screw 18 by the spring 8|. The lower end of the actuating arm 80 is keyed to the rockshaft 82 which extends into the housing 83 rigidly connected to the depending supporting bracket 45' on the auxiliary frame 45. Within the housing 83 (Fig. 16) is a shipper 84 connected to the clutch operating element which is shown in Fig. 13 in position to move the outer set of discs of the friction clutch toward the annular flange 86 of the clutch element 81. The inner set of friction discs is connected to rotate with the clutch element 81 which is keyed to the shaft 14. The outer set of friction discs is connected to the clutch element 88 which is secured to the gear I3 to rotate therewith. Therefore when the motor 32 on the turntable 33 is operated in one direction or the other power will be transmitted through the train of gearing shown in Figs. 5 and 15 to the clutch element 88 and when the lever 16 is actuated to apply the friction clutch I5 the shaft 14 will be rotated accordingly.

Mounted on the shaft I4 is a warm 89 which meshes with a worm wheel 90, the latter being keyed to the shaft 9|. As shown in Figs. 5 and 9 the shaft 9i carries a worm 92 which meshes with the large worm gear secured to the turret frame 58. Therefore when the friction clutch 15 is applied to transmit power to the shaft 9| from the motor 32 on the turntable the turret frame 58 will be rotated on the axis of the shaft 51 while held in place by the annular retaining bearing 93. In other words, the rotation of the turret frame 58 will be on the offset support 45 on the axis of the shaft 51 which is offset from the axis 48. Consequently since the shaft 51 is in vertical plane that extends through the shaft 48 and occupies a position below the axial line of the latter the chain kerf-cutter may more readily occupy a horizontal position at the floor level as illustrated in dotted lines in Fig. 22. Furthermore, by reason of the offset position of the shaft 51 the turret 58 may be rotated on a relatively low axis so that the cutter bar when inverted to its full line position shown in Fig. 22 will occupy a position a short distance above the upper side of the It will also be seen that by reason of the relatively low axis of the shaft 51 the drill when in its full line position shown in Fig. 22 will occupy a position approximately midway between the floor and roof of the mine chamber.

After the chain kerf-cutter has been adjusted on the axis of the shaft 51 either to any one of its horizontal positions or to any one of its vertical positions such as those shown in Figs. 20 and 21 or to any intermediate inclined position, the friction clutch "I5 may be released by releasing the lever 16 whereupon the spring M will separate the sets of friction discs sufficiently to permit the self-locking worm gearing 89, and 92, 12 to very effectively hold the kerf-cutter and the drilling machine mounted thereon in the adjusted position.

In order to swing the kerf-cutter on the axis of the shaft BI in either direction at a feeding speed, power transmission mechanism is connected between the bevel gear 60 and the large worm wheel 94 which is secured to the cutter bar turret as shown in Fig. 5. Secured to the upper side of the bevel gear 60 as viewed in Fig. 5 is an eccentric cam 95 encircling which is the circular strap 96 provided with a radial arm 91 to the outer end of which is pivoted at 98 the ratchet pawl mechanism 99 as shown in Fig. 11. A retaining plate I00 is secured by means of the cap screws IM to the eccentric cam 95 and is of sufficient diameter to overlap a portion of the circular strap 96 as shown in Fig. 5.

The pawl and ratchet mechanism is shown in detail in Figs. '7 and 11 and is diagrammatically illustrated in Fig. 9. This pawl and ratchet mechanism is mounted in a housing I02 which is provided at its upper side with a closure I03. Reversely arranged ratchet wheels I04 and I05 are confined between a shoulder at the upper end of the shaft I06 and the circular plate I01 which is secured by means of the cap screw I08 to the upper end of the shaft I09 of reduced diameter. Mounted on the inverted cup-shaped support IIO are the reversely arranged pawls III and H2 which are pivoted to the support IIO on the pin II3 A spring II4 between the arms H5 and H6 extending from the pawls III and H2 urge the latter toward their respective ratchet wheels I04 and I05.

Between the cup-shaped support H9 and the ratchet wheels I04, I 05 is located a cylindrical pawl releasing device II! which is provided with openings H8 and IIS' as shown in Figs. 9 and 11. The upper central portion of the cup-shaped pawl releasing device In as shown in Fig. 7, is connected to the shaft I I9 which is journalled in the sleeve I20 at the upper central portion of the cup-shaped support I II]. To the upper end of the shaft I I9 is secured an arm IZI the outer end of which is provided with a support I22 for the spring pressed pin I23 the upper end of which is provided with a knob I24 and the lower end of which may extend into one of the depressions I25 in the plate I25 secured to the upper side of the cap or cover I03. When the lever I2! is moved in one direction one of the pawls III or II2 will be thrown out of engagement with its ratchet wheel and the other pawl will be permitted to engage its ratchet wheel and the position of the lever I 2| will determine the position of the pawl releasing device II! to regulate the extent of movement of the ratchet wheel upon each rotation of the eccentric cam 95. That is to say, the extent of feed in either direction of swinging movement of the cutter bar may be regulated. Whether the shaft I 06 is rotated in one direction or the other the actuated ratchet wheel will be held against reversal when its pawl reverses, by the adjustable brake mechanism shown in Figs. '7 and 8, comprising the brake band I21 which is associated with the brake wheel I28 secured to the lower end of the shaft I06. As shown in Fig. 7 the shaft I06 is journalled in a bearing I29 of a block I30 secured at I3I to the housing I02. Inasmuch as the pawls are reciprocated upon rotation of the cam 95 the frame I I0 has its sleeve I20 on its upper side mounted in the bearing I32 while the lower portion of the support H0 is secured to the annular member I33 journalled in bearings on the block I30.

The lower end of the shaft I06 is provided with a bevel gear I34 which meshes with a bevel gear wheel I35 on the shaft I36. As shown in Fig. 12 the shaft I36 is journalled in the bearings I31 and I38 and carries a worm I39. The relation of the parts between the eccentric cam 95 and the worm I39 is diagramatically illustrated in Fig. 10.

As shown in Fig. 12 the bevel gear I35 is connected to the circular plate I40 by means of a shear pin MI and the plate I40 is keyed to the shaft I36. By means of the cap screw I42 the plate I40 is retained in place on. the shaft I36 and the same cap screw may be used to retain in place the keeper I43 for the shear pin I4I. Since the worm I39 meshes with the large worm gear 94 swinging feeding movement of the kerf cutting mechanism is effected by operation of the worm gearing I39 and 94. If the cutter bar should engage unusually hard material such as a sulphur ball or if the feed should be inconsistent with the hardness of the material the pin I4I will be sheared in two to protect the power transmission mechanism. Such shearing of the pin I4I will not interfere with the self-locking feature of the worm gearing I39, 94 to hold the cutter bar 21 in interlocked relation to the first turret frame 58.

The track mounted mining machine may be operated in various ways to produce kerfs either in horizontal planes or in vertical planes or in intermediate inclined planes all at right angles to the working face. Traction feed may be effected by controlling the truck propelling mechanism to move along the mine track at feeding speed. The cutter bar may be adjusted in elevation and in inclination by the mechanism associated with the three screw posts 39 between the truck frame and the support for the turntable. The cutter bar may be swung arcuately either on the turntable axis or on the axis of the shaft 6I. When the plane of the cutter bar is parallel to the mine track sumping and withdrawal cuts may be made either in upright planes or in horizontal planes or in intermediate inclined. planes. The flexibility of the mining machine enables the latter to produce kerfs over a wide range and consequently it is desirable to provide a wide range of flexibility of positioning of the drilling mechanism so that drill holes may be produced to most effectively enable the blasting charges to co-operate with the kerfs to dislodge the coal with a maximum amount of lumps and a minimum amount of slack.

A self-contained power-operated drilling machine is therefore demountably attached to the outer end portion of the cutter bar 21 as shown in Fig. 1. Such self-contained power-operated drilling machine may be of the type shown in the Trotter patent, No. 1,087,089, granted February 10, 1914, for an improvement in Drills.

In the drilling machine shown in Fig. 1'7 the electric motor 31 may be controlled by an electric switch operated by means of the lever I44. The rotation of the drill I45 together with the drill socket and holder I46 may be controlled by the mechanism operated by the rotatable knob I41. The feed screw I48 extends entirely through the supporting structure and is guided at the rear of the drill frame by means of the tube I49. The rotation of the drill and the feed thereof into the coal face as Well as the withdrawal therefrom is effected by rotation .of the feed screw I48 the operating mechanism of which is driven by the electric motor 31 under the control of the actuating knob I". The feed of the drill is of course axial and so also the withdrawal thereof from the drill hole.

The frame I50 of the drilling machine is provided with a lateral supporting bracket I5I which is provided with an arcuate flange I52 fitting into a circular guide groove I53 of the circular track I54.

The track I54 may be composed of semi-circular plates I55, I55 each of which is detachably connected by means of the bolts I56, I51 to the upright plate I58 .of the L-shaped standard I59. The bolts I56 and I 51 are screw threaded into the circular plate I60 which is encompassed by the circular track I54. The circular plate I60 is concentric with the track I54 and of such diameter as to afford a circular space I6I for travelling of the flange I52 which is L-shaped in cross section as shown in Fig. 18. It will thus be seen that the circular plate I66 locks the flange I52 in the groove I53 so that the drilling machine is locked against withdrawal from the upright plate I58 of the standard I59. However, the drilling machine is free to be tilted manually on a horizontal axis which extends at right angles through the center of the plate I66. The friction between the flange I52 and the track I54 may be sufficient to hold the drilling machine in adjusted position prior to the starting of the drill into the coal face.

The horizontal plate I62 of the standard I59 is provided with a vertical pin I63 which is adapted to extend through openings in the upper and lower plates of the cutter bar 21. The lower end of the pin I63 is screw threaded at I64 to receive a nut I65. A yoke I66 is pivoted at I6! to the nut I65 and is provided with an actuating arm I68. By means of the arm I68 the nut I65 may be tightened to secure the standard I59 in adjusted position on the cutter bar. Since the yoke I66 is pivoted at I61 the arm I68 may be swung 180 to the opposite side of the cutter bar for convenience in operation of the nut I65.

It should be particularly noted that adjustment of the drilling machine relative to the cutter bar may be made on intersecting axes which extend at right angles to each other. When the cutter bar is in a horizontal position such as that shown in Fig. 18 the adjustment of the drilling machine may be made on the vertical axis of the pin I63 and on a horizontal axis extending through the center of the plate I 66 or concentrically of the track I54. The drilling machine may be detach-' ably mounted on either side of the cutter bar and by providing additional holes or openings through the cutter bar the drilling machine may be mounted at various distances from the outer end of the cutter bar. For instance, in Figs. 24 and 25 the drilling machine may be mounted as shown in full lines or in the position indicated by the perforation I69. It is preferred, however, to mount the drilling machine adjacent the outer end of the cutter bar so as to enable the latter to afford an elongated support which will reach a considerable distance from the truck of the mining machine While the latter remains on the mine track and that such extended positioning of the drilling machine may be effected at various angles. Not only is the elongated support universally mounted but the drilling machine itself is adjustable to various positions on intersecting axes which extend at right angles to each other. The drilling machine may therefore be effectively supported to command the entire coal face for axial feeding either at right angles to the coal face or at any oblique angle relative thereto since the feed of the drill is axially thereof While the supporting framework of the mining machine remains stationary on the mine track.

During the operation of the drilling machine slipping may occur between the arcuate flange I52 and the circular track I54 and likewise between the horizontal plate I62 and the adjacent plate of the cutter bar. The cutter bar acting as an elongated support for the drilling machine is locked in stationary position by the self-locking worm gearing I39, 94 and. 92, 12.

In order to retain the cutter bar locked in a stationary position at an adjusted angle the mechanism shown in Fig. 16 is preferred. During mining operations vibrations of the cutter bar maytend to cause creeping between the worm gear elements and to prevent this I have mounted a spring-pressed brake as shown at I18 in Fig. 16 to act against an annular flange I1I on a nut I12 which is screw threaded to the extension I13 and pinned thereto at the left-hand end of the worm shaft 9|. The shaft BI is mounted in the bearings I14 and I15 in the casing I16 which is secured rigidly to the neck I11 as shown in Fig. 5. The casing I18 and the neck I11 are rigidly connected to the depending bracket 85' and the latter in turn is rigidly connected to the auxiliary frame 45 fixed to the turntable 33. The mechanism for swinging the turntable on a vertical axis relatively to the truck is also provided with self-locking worm gearing to hold the turntable locked to the truck when it is desired to hold the cutter bar stationary relative to the truck.

By referring to the diagrammatic views of Figs. 19 to 25, inclusive, the various adjustments of the mining machine to secure the desired positioning of the drilling machine will be understood. Fig. 19 illustrates adjustment of the cutter bar 21 on the vertical axis I18 of the turntable and on the axis 8| at the rear end of the cutter bar to enable the drilling machine to drill holes at an angle in its full line position and close to the ribs I19 and I88 in their dotted line positions. By firing the blasting charge in the intermediate drill hole slightly in advance of the firing of the charges in the dotted drill holes the coal will be more efficiently dislodged.

In Fig. 19 the cutter bar is in horizontal position or in such inclined position as will be permitted by the screw posts on the truck frame but the elevation of the cutter bar together with the drilling machine may be varied as illustrated in Figs. 22 and 23.

By mounting the drilling machine on that side of the cutter bar remote from the turrets the drill holes may be adjacent the plane of the floor as shown in Fig. 23 or adjacent..the plane of the roof as shown in dotted lines. The change in position may be effected by turning over the turrets to invert the cutter bar.

By mounting the drilling machine on that side of the cutter bar adjacent the turrets, drill holes in horizontal planes may be produced at various elevations one of which, as shown in full lines in Fig. 22, is midway between the floor and roof.

In Fig. 23 the turntable is shown in an elevated position relative to the truck whereas in Fig. 22 the turntable is in its lowermost position. On account of the lower position of the shaft 51 of Fig. or of the axis of the neck I11 on which the horizontal turret 58 turns, drilling, as shown in Fig. 2, may be effected in a relatively low roof mine room because of the relatively low position of the cutter bar adjacent the plane through the top of the turntable and because the drilling machine is mounted on the bottom of the cutter bar.

Drilling in still lower roof mine rooms may be carried on when the cutter bar is adjusted to its upright plane. By reason of the offset axis of the shaft 51 the turret 58 may remain below the plane extending through the top of the machine. That is to say, when the turntable is in its lowermost position and the shaft BI is horizontal to extend from either side of the shaft 51 the overall height of the entire machine is no greater than the top of the turntable. Consequently the machine may be used for making drilling holes in any position extending entirely across the working face and at any elevation between the floor and the roof, in a very low roof mine room. A plurality of shearing or vertical cuts may also be made in such low roof mine room when the drilling machine is demounted from the cutter bar. Furthermore, when the cutter bar is in an upright plane it may support the drilling machine for operation in high roof mine chambers as shown in Fig. 21. In fact the height of the roof may vary from that in which the machine may be cleared when the turntable is in its lowermost position to that in which the height may be at the upper end of the cutter in an upright plane and extending vertically upward.

The width of the mine entry or room may vary from a narrow place to one twice the radial distance from the turntable axis to the outer end of the cutter bar.

The adjustments on the turntable axis and on the axis at the rear end of the cutter bar may also be taken advantage of to support the drilling machine to drill a hole spaced back from the rib I8I as shown in Fig. 24, or to drill a hole at right angles to the rib I82 as shown in Fig. 25. In all of the operations of the drilling machine illustrated in Figs. 19 to 25, inclusive, the supporting framework remains in stationary position on the mine track, the feed of the drill always being axially of the drilling tool.

All of the adjustments of the cutter bar as to elevation and inclination are made by self-contained power-operated mechanism and after such adjustments have been made the drilling machine is manually adjusted relative to the cutter bar and the supporting standard I59 manually secured in adjusted position by means of the handle on the opposite side of the cutter bar. The final adjustment will be on the transverse supporting axis of the drilling machine frame. During operation the drilling machine will be yieldingly held on its intersecting axes relative to the cutter bar while the latter is held rigid and stationary.

In order to lock the turntable 33 to the ring I83 (Fig. 1) which is mounted on the adjusting screw posts 39, looking devices I88 are associated with the notches I85 in the periphery of the turntable 33. The ring I83 is carried by the pedestals I85 which depend therefrom and a nut I86 is threaded on the screw post 38 as shown in Fig. 4. By means of the lever I81 the clutch I88 may be operated to control individual elevation of the nut I86 and the pedestal I85, the sprocket I89 being connected to the vertical screw post 39 to rotate therewith.

By referring to Figs, 1 and 23 it will be seen that the overall height of the drilling machine is relatively low and the machine is therefore adapted to operation in a low roof mine chamber. However, the same machine may be operated in high roof mine chambers because of the high reach afforded by the arm 21 which is adjustable on the axis 6| as shown in Fig. 21. The boom 58 shown in Fig. 5 is mounted on the truck for horizontal swinging movement on the vertical axis I18 of the turntable 33. The axis 6I on which the arm 21 is swingable extends at right angles to the horizontal axis 51 of the boom. When the axis GI is horizontal the arm 21 may be moved in a vertical plane to inclined positions extending upwardly or downwardly relative to the horizontal and held at such adjusted inclinations.

As shown in Fig. 18 the drilling implement is adjustably mounted on the arm 21 for adjustment relative thereto on rectangularly related axes I63 and I52. The axis I63 is permanently at right angles to the arm 2'! and therefore permanently parallel to the axis 6|. The axis I52 is permanently at right angles to the axis of the drill. Consequently, whenever the axis GI is horizontal and the arm 21 is inclined upwardly or downwardly as shown in Fig. 21 and the drill is parallel to the mine track and perpendicular to the working face, the axis I52 will be vertical. The adjustment of the drill to such right angle position when the arm 21 is inclined upwardly or downwardly is on rectangularly related axes one (I52) of which is vertical and at right angles to the drill axis and the other (I63) of which is horizontal and parallel to the axis BI.

By rotating the boom 58 on the horizontal axis 51 through an angle of 180 the arm 21 with the drilling implement thereon may be inverted to locate it in a horizontal plane adjacent to the mine bottom or in a horizontal plane adjacent to the mine roof as shown in Fig. 23. In a similar manner inversion of the arm 21 enables the drill to be located in vertical planes adjacent to the opposite ribs as shown in Fig. 20. In addition to the positions of the drill at right angles to the working face as illustrated in Figs. 20 and 23, the drill may be adjusted to a position at right angles to such working face at any point over its entire area, by rotating the boom 58 on its horizontal axis until the axis I52 is in a vertical plane parallel to such working face. This may be accomplished irrespective of the inclination of the arm 21 on its pivot 6| because whenever the axis I52 is in such vertical plane the axis of the drill is swingable on the axis I52 to a position at right angles to the working face.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and I wish therefore not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of my invention, what I desire to secure by Letters Patent of the United States is:

1. In mining apparatus, the combination with a wheel mounted base frame, of a turntable mounted thereon, means for adjusting the elevation and inclination of said turntable, a depending neck mounted on said turntable to move bodily therewith, a turret mounted on said neck to turn on a horizontal axis extending radially of said turntable and offset below the top thereof, a second turret mounted on said first-named turret to turn relatively thereto on an axis extending at right angles to the axis of said neck, an elongated support on said second turret, a drill unit demountably attached to the outer end portion of said support, and means for turning the turrets on their respective axes to effect adjustments of said support and said drill unit.

2. In a drilling tool. a portable base, a boom swivelly mounted on said base to swing horizontally relative thereto about a vertical axis, an arm structure pivotally mounted on the outer extremity of said boom to swing relative thereto, a drilling implement swivelly mounted on the outer extremity of said arm structure to swin relative thereto about angularly related axes, and means for swinging said arm structure about the longitudinal axis of said boom to position said drilling implement in relatively high and relatively low planes.

3. In a drilling tool, a portable base, a boom swivelly mounted on said base to swing horizontally relative thereto about a vertical axis, an arm structure pivotally mounted on the outer extremity of said boom to swing relative thereto, a drilling implement swivelly mounted on the outer extremity of said arm structure to swing relative thereto about rectangularly related axes, and means for swinging said arm structure about the longitudinal axis of said boom to position said drilling implement in relatively high and relatively low planes.

4. In drilling machine, the combination with a wheeled frame adapted to move along a mine track, of a boom mounted on said frame for adjustment relative thereto on rectangularly related axes one of which is vertical and the other horizontal, an elongated arm pivoted to said boom for adjustment relative thereto on an axis extending transversely of said horizontal axis, a drilling implement at the outer end of said arm, mechanism affording adjustment of said drill implement relative to said arm on rectangularly related axes one of which shall be in a vertical plane when said transverse axis is horizontal to enable positioning said drilling implement at right angles to the working face extending across the space in advance of the mine track and parallel to the ribs, means for rotating said boom on said horizontal axis to change the position of the drilling implement from a horizontal plane below said arm to a horizontal plane above said arm, and means for swinging said arm on said transverse axis and holding the same in adjusted position.

5. In a track mounted drilling machine, the combination with a wheeled frame having a relatively low overall height adapted to travel on a mine track in a low roof mine chamber, of a horizontal boom rotatable on a horizontal axis and mounted on said frame for adjustment relative thereto on a vertical axis, an elongated arm pivotally connected to the outer extremity of said boom for adjustment relative thereto on an axis extending transversely of said boom, a drilling implement, means for mounting said drilling implement on said arm for adjustment relatively thereto on rectangularly related axes one of which extends transversely of said arm in parallelism at all times to said first-named transverse axis and the other of which is permanently at right angles to the drilling implement axis, means for swinging said arm on said first-named transverse axis and holding the same in adjusted position, and means for rotating said boom together with said arm and drilling implement on said firstnamed horizontal axis to position the said right angle axis in a vertical plane parallel to the working face extending across the space in advance of the mine track.

6. In mining apparatus, the combination with a wheel mounted truck adapted to travel on a mine track, of an elongated cutter bar adapted to serve as a support for a drilling machine, a demountable drilling machine on the outer end portion of said cutter bar, mechanism for supporting said cutter bar for adjustment on a horizontal axis and on spaced axes one of which is permanently upright and the other of which varies from upright to horizontal while remaining permanently at right angles to said horizontal axis, and means for operating said adjustable supporting mechanism to effect adjustment of said drilling machine.

'7. In mining apparatus, the combination with a mining machine comprising a base frame, an elongated cutter bar of a kerf-cutter, means for supporting the cutter bar for universal adjustment relative to said frame, and self-contained power-operated mechanism for operating said universally adjustable supporting means to effect adjustment of the cutter bar, of a drilling machine, and means for adjustably mounting said drilling machine on the outer end portion of said cutter bar for bodily movement with the latter when adjusted by said power-operated mechanism.

8. In mining apparatus, the combination of a mining machine having a kerf-cutter cutter bar and means for adjusting the latter, and a self-contained power-operated drilling machine mounted on said cutter bar to move bodily therewith to partake of the adjustments thereof to locate the drilling machine for operation at a predetermined point at the coal face.

9. In mining apparatus, the combination with a mining machine comprising a kerf-cutter cutter bar, of a drilling machine mounted on said cutter bar to partake of the adjustments of the latter and thereby secure adjustment of the drilling machine at the Working face of the mine vein, and power connections to the mining machine and to the drilling machine.

10. In mining apparatus, the combination with a drilling machine unit, of a standard for supporting the same, means affording an annular grooved track on said standard, an arcuate tongue secured to said drilling machine unit and extending into the said grooved track to move arcuately along the same, and a disk secured to said standard concentrically with said grooved track in position to lock said arcuate tongue in said groove thereby mounting said drilling machine unit on said standard for adjustment on an axis extending at right angles to the feeding axis of said drilling machine unit.

11. In mining apparatus for a low roof mine vein, the combination with a Wheeled frame adapted to travel along a mine track, of a sup port pivoted to said frame to swing horizontally relative thereto on a vertical axis, a bearing extending radially from said support, a supplemental frame pivotally mounted on said bearing for rotary adjustment on a horizontal axis permanently at right angles to said vertical axis, an arm pivotally mounted on said supplemental frame to swing relatively thereto on an axis permanently at right angles to said horizontal axis, a drilling implement mounted on the outer end portion of said arm for adjustment relative thereto on rectangularly related axes one of which is permanently parallel to the pivotal axis of said arm thereby enabling said drilling implement to be adjusted into position to drill a hole at right angles to the working face extending across the space in advance of the mine track when said arm pivotal axis is horizontal and parallel to such working face, and means for adjusting said supplemental frame on said first-named horizontal axis to adjust the arm pivotal axis to a horizontal plane.

12. In a drilling machine, the combination with a wheeled frame adapted to travel on a mine track, of a bearing extending radially from said frame, a supplemental frame mounted on said bearing for rotary adjustment on a horizontal axis, an elongated support pivotally connected to said supplemental frame on an axis extending at right angles to said horizontal axis, a selfcontained power-operated drilling unit mounted on the outer end portion of said elongated support for adjustment relatively thereto on rectangularly related axes one of which is permanently parallel to said pivotal axis, means for adjusting said supplemental frame on said horizontal axis to move said pivotal axis in a plane permanently at right angles to said horizontal axis, and means for adjusting said radial bearing together with said supplemental frame and said elongated support andJsaid. drilling unit on an upright axis to enable said drilling unit to command substantially the entire area of the coal face extending across the space in advance of the mine track with the drilling axis substantially at right angles to such coal face in the various positions to which adjusted.

, 13. In a drilling machine, the combination with a wheeled frame adapted to travel on a mine track,,of a supplemental frame mounted on said first-named frame to swing relatively thereto on an upright axis and to, rotate on a horizontal axis, an arm pivotally mounted on said supplemental frame to swing relatively thereto on an axis extending transversely of said horizontal axis, a self containe'd power-operated drilling unit, mechanism for supporting said drilling unit on the outer end portion of said arm for adjustment relatively thereto on rectangularly related axes one of which is permanently in parallelism to said transverse axis, mechanism for swinging said arm on said transverse axis to adjust the position of the drilling unit, and means for rotating said supplemental frame together with said arm and said drilling unit -on said horizontal axis to'invert said drilling unit whereby said drilling unitmay be positioned at right angles to the working face extending across the space in advance of the mine track at any point over a wide area bet'ween thafloor and roof of the mine room or between the ribs thereof.

l4. In mining apparatus, the combination with a base frame, of a turntable mounted thereon for adjustment relative thereto on'a vertical axis, a supplemental frame mounted on said turntable for adjustment relative thereto on a radially extending horizontal axis, an elongated support pivotally mounted on said supplemental frame for adjustment relative'thereto on an axis permanently at right angles to said horizontal axis and adjustable to various positions in a vertical plane parallel to and spaced from said vertical axis, a drill unit mountedon the outer end portion of said elongated support, means for adjusting said turntable on said vertical axis to extend the reach of said drill unit arcuately and laterally, means for adjusting said elongated support on said right angleaxis to extend the reach of said drill unit from the floor to the roof along the working face whensaid right angle axis is horizontal, means for adjustably supporting said drill unit on said elongated support on rectangularly related axes one of which is permanently parallel to" the transverse pivotal axis of said elongated support, and means for adjusting said supplemental frame relative to said turntable on said horizontal axis.

15. In mining apparatus, the combination with a wheeled truck adapted to travel on a mine track, of a turntable mounted thereon for adjustability thereto on an upright axis, a radially extending bearing on said turntable, a turnover head supported by said bearing on said turntable for bodily movement therewith on said upright axis and for rotary adjustment relative to said turntable on a radial horizontal axis extending at right angles to said upright turntable axis, an elongated support pivotally mounted on said head for adjustment relative thereto on an axis extending at right angles to said radial axis, a drilling unit, means for adjustably supporting said drilling unit at the outer end portion of said elongated support on rectangularly related axes, mechanism for swinging said elongated support on said pivotal axis, and means for rotatably adjusting said head on said radial axis.

16. In mining apparatus, the combination with a wheeled truck adapted to travel on a mine track, of a turntable mounted thereon for adjustment relative thereto on an upright axis, means for adjusting the elevation of said turntable relative to said truck, a radially extending bearing on said turntable, a head having a neck mounted on said bearing, means for rotating said head by said neck On said bearing on a radial axis extending at right angles to the turntable axis, an elongated support pivotally connected to said head on an axis extending at right angles to said radial axis, a drilling unit, means for adjustably supporting said drilling unit on the outer end portion of said elongated support on rectangularly related axes, and means for swinging said elongated support on its pivotal axis.

17. In mining apparatus, the combination with a portable support, of a turntable thereon, means for locking said turntable in its various positions of angular adjustment relative to said support, a turn-over head mounted on said turntable for rotary adjustment relative thereto, an elongated arm pivotally connected to said turn-over head to co-act with the adjustment thereof relative to said turntable for movement into different lateral positions and different elevated positions relative to said support, a drilling tool adjustably mounted on the outer end portion of said elongated arm, motor operated mechanism for adjusting said turn-over head relative to said turntable and for adjusting said arm relative to said turn-over head to enable said cutting tool to be positioned relative to said arm in parallel posi-' tions each perpendicular to the working face extending across the space in advance of said support, and separate motor operated mechanism for operating the drilling tool in any of said right angle positions.

18. In a drilling machine, the combination with a portable base, of a head swingable horizontally relatively to said base about a vertical axis, an elongated arm pivotally mounted on the outer end portion of said head to swing into relatively inclined positions relative thereto, a drilling implement mounted on the outer end portion of said arm for adjustment relatively thereto on rectangularly related axes, motor operated mechanism for adjusting said head relatively to said base and for adjusting said arm on its pivot relatively to said head and for holding said arm in adjusted position relative to the base, and motor operated mechanism for driving said drilling implement.

19. In a mining machine, the combination with a portable base, of a turntable mounted thereon for rotation relatively thereto on an upright axis,

means for locking said turntable in adjusted angular position relative to said base, a head mounted on said turntable for adjustment relative thereto on a horizontal radial axis, an elongated arm pivotally connected to said head on an axis extending at right angles to said horizontal axis and confined to adjustments in a plane parallel to the Vertical axis of the turntable, a drilling unit mounted on the outer end portion of said elongated arm for adjustment relative thereto on rectangularly related axes, and motor operated mechanism for adjusting said head on said horizontal axis and for adjusting said elongated arm on said transverse axis in cooperation with the adjustments of the drilling unit on said rectangularly related axes to enable positioning the drill closely adjacent to the ribs of a mine entry and parallel to said ribs with the drill approximately at right angles to the working face extending across the space in advance of the machine anywhere from a position near the roof to a position near the floor of a mine entry.

20. In a drilling machine, the combination with a portable base having a relatively low overall height, of a support extending outwardly from said base in a horizontal direction, a head mounted on said support for rotary adjustment relative thereto on a horizontal axis spaced below a horizontal plane extending through the top of said support, an arm pivotally connected to said head to swing into relatively inclined positions relative thereto on a horizontal axis extending transversely of said first-named axis, a drilling implement swivelly mounted on the outer end portion of said arm for adjustment relative thereto, and motor-operated mechanism for rotating said head on its axis and for swinging said arm on its axis.

21. In a drilling machine, the combination with a portable base, of a relatively short horizontal bearing extending outwardly from said base, a head mounted on said short bearing for rotatable adjustment relative thereto, said head having a laterally off-set extension, an elongated arm pivotally connected to said head on a transverse axis, a drilling unit mounted on said arm for adjustment relative thereto on an axis extending transversely of said arm, means for rotating said head to adjust said arm to a position near the mine bottom, and means for swinging said arm on said transverse axis to locate said drilling unit at the working face near the mine bottom.

22. In a drilling machine, the combination with a portable base, of a supporting frame thereon, a head mounted on said frame for rotatable adjustment relative thereto on a horizontal axis, said head having a transverse extension adapted to project to a position near the mine bottom when said head is in a predetermined position, an elongated arm pivoted to said head on a transverse axis which is adapted to occupy a vertical position when said head is in said predetermined position, a drilling unit pivoted to said arm on a transverse axis adapted to occupy a vertical position when said head is in such predetermined position, means for rotating said head on its axis, and means for swinging said arm horizontally on its axis to enable said drilling unit to occupy various positions between the ribs of the mine entry each near the mine bottom and each for drilling a hole in the working face either angularly or perpendicularly relative to the working face.

23. In a drilling machine, the combination with a portable support, of a turntable mounted thereon for rotary adjustment relative thereto on an upright axis, an elongated arm pivotally connected to said turntable on a horizontal axis, a drilling unit connected to the outer end portion of said arm for adjustment relative thereto on rectangularly related axes, motor operated mechanism for swinging said elongated arm in vertical planes on said horizontal axis while said turntable occupies an adjusted position relative to said portable base, and self-contained poweroperated mechanism for operating said drilling unit to drill holes perpendicularly to the working face extending across the space in advance of the machine parallel to one of the ribs of the mine entry and closely adjacent thereto at any point extending from a position near the roof to a position near the mine bottom.

24. In a drilling machine, the combination with a portable base, of a turntable mounted thereon, a turn-over head mounted on said turntable for rotatable adjustment relative thereto on a horizontal radial axis, an elongated arm pivotally connected to said head on an axis extending transversely of said horizontal axis, a drilling unit mounted on the outer end portion of said arm for adjustment relative thereto on rectangularly related axes, mechanism for adjusting said turnover head on said horizontal radial axis and for swinging said arm on said transverse axis and holding said head and arm in adjusted positions relative to said turntable, and self-contained power-operated mechanism for operating said drilling unit to drill holes closely adjacent either rib of the mine entry and parallel thereto and approximately perpendicular to the working face extending across the space in advance of the machine.

25. In a drilling machine, the combination with a wheeled truck adapted to travel on a mine track, of a turntable mounted thereon, a turntable head mounted on said turntable for adjustment relative thereto, an elongated fiat bar pivoted to said head on an axis extending transversely of the turn-over head axis, a drilling unit mounted on the outer end portion of said fiat elongated arm for adjustment relative thereto on rectangularly related axes, motor operated mechanism for adjusting said turn-over head and for adjusting said flat elongated arm, and motor operated mechanism for operating said drilling unit.

26. In a drilling machine, the combination with a portable base, of a horizontal support swivelly mounted on said base and overlying said base and swingable horizontally relatively to said base into positions where the outer extremity thereof overhangs the sides of said base, a head pivotally mounted on a horizontal axis on the outer extremity of said support and branching downwardly from said support along either side of said base at the rear of the forward end of said base, an elongated arm pivotally connected to the downwardly branching end of said head on a vertical axis, a drilling unit swivelled on the outer end portion of said arm to swing about rectangularly related axes additional to said horizontal axis, and means for adjusting said head relative to said support and adjusting said arm relative to said head and holding said arm and head in adjusted positions relative to said support.

27. In a drilling machine, the combination with a portable base, of a turntable mounted thereon for adjustment relative thereto on an upright axis, a relatively short bearing mounted on said turntable and extending radially therefrom, a turn-over head mounted on said short bearing near said turntable, an elongated arm pivoted to said head on an axis extending transversely of the turn-over head axis, a drilling unit pivotally mounted on said arm, and mechanism comprising gearing carried by said head for rotating the latter on said bearing and for swinging said arm on said transverse axis to adjust said arm and hold the same in adjusted position during operation of the drilling unit.

28. In a drilling machine, the combination with a portable base, of a support pivotally mounted on said base to swing horizontally relatively thereto, a rotatable head mounted on said support outside of the confines of said base but a short distance therefrom for adjustment relative to said base on a horizontal axis, an elongated arm pivotally mounted on said head on an axis at right angles to said horizontal axis, a drilling unit swivelly mounted on the outer end portion of said arm in a position widely spaced from said base for adjustment to either rib of mine entries of varying widths and to the floor and roof of mine entries of varying heights, and means for'adjusting said head on said axis and for adjusting said arm relative to said head and holding the arm in adjusted position.

29. In a drilling machine, the combination with a portable base, of a turntable mounted thereon for adjustment relative thereto on an upright axis, mechanism for adjusting the elevation of said turntable relative to said base, a radial bearing on said turntable, a rotatable head mounted on said bearing and provided with an extension transversely of the axis of said bearing, an elongated arm pivoted to said head on a transverse axis at right angles to the axis of said bearing to occupy a position parallel to said bearing axis and spaced therefrom, mechanism for rotating said head on said bearing axis while said transverse axis is confined to a plane parallel to the turntable axis, a drilling unit swivelly mounted on said arm to move bodily therewith, and mechanism for swinging said arm on said transverse axis to effect adjustment of the position of the drilling unit.

30. In a drilling machine, the combination with a truck adapted to travel on a mine track, of a support mounted thereon to rotate horizontally relatively thereto on a vertical axis, a head journaled to said support and having an overhanging extension, an arm pivotally connected to said extension, a drilling unit swivelly connected to the outer end portion of said arm on rectangularly related axes, means for holding the drill unit in adjusted positions on said rectangularly related axes, means for holding said support in adjusted positions on said vertical axis, means for holding said head in adjusted positions relative to said support, and means for holding said arm in adjusted positions relative to said head, the adjustments on the aforesaid axes enabling said drilling unit to'be positioned at a plurality of elevations at right angles to a coal face extending transversely of the space in advance of the mine track.

31. In a drilling machine, the combination with a portable base, of a support swingable horizon tally relatively to said base about a vertical axis, an arm swivelled to the outer end of said support to swing relatively thereto on a horizontal axis, the outer end of said arm being offset from said horizontal axis, a drilling implement swivelly mounted on the outer end portion of said arm to swing about rectangularly related axes .'relatively to said arm, means for rotating said arm on said horizontal axis to change the elevation of the outer end of said arm, means for holding said drilling implement in adjusted position on said rectangularly related axes, and means for operating the drilling implement including feed thereof. V

32. In a drilling machine, the combination with a truck adapted to'travel on a mine track, of a horizontal support mounted on said truck to swing horizontallyv relatively thereto, an arm pivotally mounted on the outer end of said horizontal support to swing into angularly related positionsinplanes above and below thepivotal connection between said arm and said support, a drilling implement mounted on said arm for adjustment relative thereto on rectangularly related axes, means connected tosaid support and arm for swinging the latter aboutits pivot relatively to said support and for holding said arm in its different angular positions, and means for operating said drilling implement including feed thereof parallel to the mine track.

33. In a drilling machine, the combination with a truck adapted to travel on a mine track, of a 1 turntable mounted on said truck .to rotate horizontally relatively thereto about a vertical axis, an arm structure pivotally mounted on said turntable to swing relatively thereto, a drilling implement swivelly mounted on the outer end portion of said arm structure to swing relatively thereto about re'ctangularly related axes, and means for swinging said arm structure about a radial horizontal axis relatively to said turntable to position'the drilling implement in relatively high and relatively low..planes.

34. In a drilling machine, the combination with a truck adapted to travel on a mine track, a turntable mounted on said truck to rotate horizontally relatively thereto about a vertical axis, an arm structure pivotally mounted on said turntable to swing relatively thereto on rectangularly related 'axes one ofwhich is a radial horizontal axis, a drilling implement swivelly mounted on theouter end portion of said arm structure to swing relatively thereto about rectangularly related axes, and'means for swinglng'said arm structure about said radial horizontal axis to position said drilling implement in relatively high and relatively low planes.

35. In a drilling machine, the combination with a supporting bar, having outer flat surfaces in parallel spaced-apart planes; of a standard adaptedto fit either flat side of said supporting bar, means for detachably securing said standard to either flat side of said bar in adjusted position on an'axis extending at right angles to said bar, a drilling unit, and means for pivotally connecting said drilling unit to said standard for adjustment relative to said bar on an axis extending transversely'of said right angle axis.

36. In a drilling machine, the combination with a supporting bar having outer surfaces in parallel spaced-apart planes, of an L-'shaped standard having plane legs at right angles to each other, a

clamping device extending through a hole in said bar and adapted to secure one of said legs to either of said outer surfaces, a drilling unit, and means for pivotally supporting said drilling unit on the other leg of said standard.

3'7. In a drilling machine, the combination with a drilling unit, of a supporting bar, an L-shaped standard,.mechanism securing said standard to said bar in adjusted position relative thereto on an axis at right angles to said bar, mechanism for mounting said drilling unit on said standard for adjustment relative thereto on an axis parallel to said bar and extending transversely of said firstnamed axis with the drilling axis intersecting said right angle axis.

38. In a drilling apparatus, a portable base, a

; boom structure mounted on said base for swinging movement relative thereto, said boom structure solely supported by said base and extending forwardly in advance of said base, a drill support mounted on the outer extremity of said boom.

structure for rotation aboutthe longitudinal axis of said boom structure, motor operated devices for swinging said boom structure and for holding said boom structure in its different adjusted positions relative to said base, motor operated devices for rotating said drill, support about its axis relative to the base, and a drilling implement mounted on said drill support for swinging movement relative thereto about rectangularly related axes.

40. In a drilling apparatus, a portable base, an

N elongated supporting struoturemounted on said base foradjustment in a plurality of a'ngularly related directions relative thereto about spaced axes one of which is vertical and another horizontaLthehorizontal axis located on said base in advance of said vertical axis, said supporting structure extending forwardly in advance of said base, a drilling tool mounted on the outer extremity of said supporting structure, and motor operated devices for adjusting said supporting structure in aforesaid directions relative to said base and including a motor for effecting said adjustments.

LEWIS E. MITCHELL.

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