US1984372A - Drilling tool - Google Patents

Description

M. P. HOLMES Dec. 18, 1934.

DRILLING TOOL Original Filed June 23 1927 4 Sheets-Sheet l o m 3 W Z 0 HI U l I 0% -1 w. 1mm 0 5 Z V wwww m N \Qw WQ 5 HM, g lfw/ .2 w J I Nfir ,HWJNN. F- ,IJ Q3 Dec. 18, 1934. M R HQLME 1,984,372

DRILLING IOOL Original Fild June 25, 1927 4 Sheets-Sheet 2 azz;

Dec. 18, 1934. p HOLMES 1,984,372

DRILLING TOOL Original Filed June 23, 1927 4 Sheets-Sheet 5 M. P. HOLMES DRILLING TOOL Dec. 18 1934.

Original Filed June 23, 1927 4 Sheets-Sheet Patented Dec. 18, I934 UNITED STATES PATENT OFFICE Massachusetts Application June '23, 1921, SerialNo'. 200,826 Renewed August25,1932

44 Claims. (01. 2 2-4- This invention relates to drilling mechanism, and more particularly, to rotary drilling tools especially adapted to use in the drilling of shot" or blast holes in coal or other mines.

. An object of this invention is to provide an improved drilling tool of the rotary type having improved feeding and supporting means therefor. Still another object is to provide an improved drilling tool having improved adjustable supporting means whereby the tool is rendered exceedingly versatile. Still another object of the invention is to provide an improved rotary drilling tool such as commonly used in coal mines, having improved. supporting ;means associated with a coal cutting machine whereby the drilling tool may be conveniently transported while mounted on the cutting machine from one working place to another, and may be quickly and conveniently positioned for operation in any desired relation to the material to be drilled, with a minimum expenditure of effort. Yet another object is to provide an improved tool feeding mechanism of the differential screw type whereby the drilling implement may be fed positively in opposite directions at different speeds. Yet another object is to provide an improved drilling tool for use in conjunction with a coal mining machine whereby a plurality of shot holes may be drilled in the mine wall during the cutting operation of the machine. 'These and other objects and advantages of this invention will; how ever, hereinafter more fully appear.

In the accompanying drawings there is shown for purposes-of illustration one form which the invention may assume in practice.

In these drawings,

Fig. 1 is a side elevational View of a coal cutting machine with which the improved drilling tool is incorporated, the drilling tool being shown in its lowered position.

Fig. 2 is an enlarged detail sectional View taken through the longitudinal vertical center of the machine and illustrating the driving connections between the machine driving motor and the drilling tool.

Figs. 3, 4 and are transverse vertical detail sectional views taken respectively on line 33, 4-4. and 5-5 of Fig. 2.

Fig. 6 is a transverse horizontal sectional view taken on line 6-6 of Fig. 2. I Fig. '7 is a detail elevational view looking at the opposite side of the drilling tool from that shown in Fig. 1.

Fig. 8 is a plan view of the drilling tool shown in Fig. 7. V l

Fig. 9 is an end elevational view of the drilling tool shown in Figs. 7 and 8, the drilling tool being shown'when in different positions as indicated by dotted lines. v 1

Fig. 10 is a central longitudinally extending vertical-sectional view taken 'through the improved drilling tool and the driving connections therefor.

Fig. 11*is a transverse horizontal sectional view taken on linell-ll of Fig. 10.

Fig. 12 is a. detail sectional view of the drill chuck. v I

Figs. 13 and 14 are transverse vertical sectional views taken respectively on lines 13-13 and "14-14 of Fig. 12 and illustrating detailsof the chuck.'-

Figs, 15 and 16 are diagrammatic views illustrating the various operative positions of the drilling tool.

In this illustrative embodiment of the invention, there is shown a drilling tool, generally designated 1, of improved form carried by improved supporting means 2 in turn adjustably mounted on a portable'support, herein a coal cutting machine 3. The coal mining machine 3 may assume various forms, but for purposes of illustration I have shown a mining machine of the type described in my copendingapplication which has now matured into Patent No. 1,785,961, granted December 23, 1930. This machine generally comprises a body or frame! mounted on wheels 5 adapted to run alonga mine trackwayfi. Supported on the forward end of the frame-4 is a cuttercarrylng head? rotatable relative to the frame about a longitudinal axis and having pivotally supported thereon a cutter bit carrying cutter-bar 8, the latter being adjustable with the head about the head axis into a bottom cutting position, a top cuttingposition and a vertical cutting position as clearly described in thy-patent mentioned above. Housed within the frame 4 is a 'usua-ldriving motor, herein preferably of the reversible electric type, having its-power shaft extending longitudinally of the machine frame and driving, through suitable connections clearly described in my patent mentioned above, the cutting mechanism, the truck wheel driving mechanism and all the other various devices of the machine. In view of the full disclosure of this machine in the patent mentioned, it will suflioe here .to state that the machine has plural speed (transport andcutting), rates of translation, has power bar swing to effect swinging cuts, and is arranged 'to cut horizontally or to shear, as may Joedes'ired, andcaniperform its horizontal cutting functions either adjacent the mine floor or in higher planes-above the axis of rotation of bodily bar adjustment.

Referring to the improved drilling tool, and more particularly to the improved driving connections and adjustable supporting means therefor, it will herein be noted that secured at 9 to the rear end of the power shaft of the mining machine driving m'otor (see Fig. 2) is a spur pinion 10 which meshes with a spur gear 11, herein preferably formed integral with a hollow shaft 12. As shown, the shaft 12 is rotatably mounted on ball bearings 18 supported by a coaxial horizontal shaft 14 arranged above and parallel with the motor shaft. Also formed integral with the shaft 12 is a bevel pinion 15 which meshes with a bevel gear 16 fixed, as at 1'7, to a vertical drive shaft 18. The shaft 18 is journaled in spaced alined ball bearings 19 suitably supported by a horizontal turntable, herein in the form of a swivel frame or housing 20; The housing 20 is mounted for rotation relative to the frame 4 of the coal cutting machine about a vertical axis coincident with the longitudinal axis of the shaft 18 and is journaled on rollers 21 carried by the circular base plate 22 of the housing 20. The rollers 21 are guided in an annular recess 23 formed within the machine frame 4. The rollers 21 are maintained in position by means of a de tachable retaining plate 24, herein preferably composed of two parts, secured to the machine frame 4 by suitable screws 25. Again referring to the driving connections for the drilling tool, it will be observed that arranged above and coaxially with the shaft 18 is a drive shaft 26 journaled in spaced alined ball bearings 2'7 suitably supported within the housing 20. The shafts 18 and 26 are adapted to be connected together for simultaneous rotation by means of a suitable clutch device comprising clutch teeth 28 and 28 formed,on the adjacent ends of the shafts 18 and 26 respectively. Surrounding the shafts 18 and. 26 is a shiftable clutch member 29 having internal clutch teeth which are adapted to cooperate with the teeth 28 and 28 Cooperating with this clutch member 29 is a pivoted shipper yoke 30 (see also Fig. 6) fixed to a horizontal shaft 31 rotatably mounted within the housing 20 and carrying at its outer end a crank or arm 32 having its extremity slottedat 33. Cooperating with this slot is an eccentric pin 34 carried by a rotatable disc 35 formed on a horizontal actuating shaft 36. .As shown in Fig. 6 the shaft 36 is rotatably mounted in a bearing sleeve3'7 carried by the housing 20 and this shaft has secured thereto at its outer end an operating handle 38. The handle 38 is weighted and when it is. swung into its different positions its weight maintains the clutch member 29 either "in or out. From the foregoing it is evident that when the operator grasps the handle 38 and rotates the shaft 36 the crank 32 is swung either upwardly or downwardly by the eccentric pin and slot connection and as a result the clutchmember 29. is moved axially and the clutch teeth 28 and 28 are either connected or disconnected. Thus it is obvious that the shafts 18 and 26 may be connected or disconnected at will. As clearly shown in Fig. 2 the shaft 26 has fixed thereto by a key 39 a bevel pinion 40 which meshes with a bevel gear 41 (see also Fig. 6) rotatably mounted on ball bearings 42 carried by a horizontal stud 43 extending transversely of the casing and supported thereby. The bevel gear 41 meshes with a bevel gear 44 keyed at 45 to a shaft 46 which is herein the main driving shaft for the drilling tool. As shown in Figs. 2 and 10 the main driving shaft 46 is journaled at its opposite ends in ball bearings 47 and 48, the ball bearings 4'7 being supported by a tubular supporting arm or boom 49 while the bearings 48 are supported by a plural part casing or swivel bracket 50 on which the drilling tool is adjustably mounted as will later be described. The tubular arm 49 surrounds the shaft 46 and is journaled for rotation about its longitudinal axis at its rear end in ball bearings 51 carried by a plural part casing or housing 52 herein rotatably mounted on a horizontal axis at 53 for angular swinging movement relative to the swivel casing 20. As shown in Figs. 10 and 11 the outer extremity of the tubular arm 49 is keyed at 54 to the swivel bracket 50. As illustrated, the outer end of the main driving shaft 46 has keyed thereto at 55 a bevel pinion 56 which meshes with abevel gear 5'7 (see Fig. 11) suitably secured to a shaft 58, the latter being arranged transversely of the bracket 50 and journaled in ball bearings 59 carried thereby. Arranged coaxially with the shaft 58 and formed integral with the bracket 50 is a bearing sleeve 60 which cooperates with a concentrically arranged bearing sleeve 61 herein formed integral with a plural part casing or drill housing 62, the bearing sleeves 60 and 61 forming a pivotal connection between the bracket 50 and casing 62 as will later be described. Secured to the end of the shaft 58 opposite from the bevel gear 5'7 is a bevel gear 63 which meshes with a bevel gear 64 secured by a key to a shaft 65 extending radially from the axis of the shaft 58 and arranged, when the parts assume the position shown in Fig. 10, parallel with the shaft 46. The shaft 65 is journaled at its opposite ends in ball bearings 66 suitably carried by the casing 62. Suitably secured to the shaft 65 are spur gears 6'7 and 68, the gear 67 having a greater number of teeth than the gear 68. The gears 67 and 68 mesh with spur gears 69 and '70 respectively through which the improved rotation means and feeding mechanism for the drilling implement are driven. Referring more particularly to Fig. 10 it will be noted that the gear 69 is keyed at '71 to the outer casing '72 of a drill friction and this casing '72 carries a series of friction plates or discs '73 which are interleaved with a corresponding series of friction plates or discs '74 carried by a spider member '75. As shown, the spider member '75 is journaled at its ends in ballbearings '76 suitably supported within the drill housing 62. The spider '75 has formed thereon at its forward end internal keys or splines '77 which cooperate with splineways or grooves '78 formed in a tubular drive member '79, the grooves '78 extending lengthwise of the tubular drive member '79. The member '79 is movable axially through the spider member '75. As shown in the drawings the gear '70 is keyed at to an outer casing 81 of a feed friction and this casing carries a series of friction plates or discs 82 which are interleaved with a corresponding series of plates or discs 83 carried by a spider member 84 similar to the spider member '75 heretofore described. The inner ends of the spider members '75 and 84 are respectively secured to bushings 85 on which the friction casings '72 and 81 are respectively mounted. The spider member 84 is mounted on and splined at 86 to a tubular drive member 87 fixed at 88 at its rear end to a feed screw 89, the latter extending centrally within the tubular drive member 79. The member 8'7 is journaled on ball bearings 90 carried by the drill housing 62. The

'member '79 has formed integral therewith at its 119 and the forward end ofthe drive member 79 rear end a feed nut 91 threadedlyconnected at 92 to the feed screw 89. The axial thrust of the drill and feed frictions is transmitted through the bushings to the inner races of the ball bearings 76 and 90. Moreover, thetubular drive member 87 has formed thereon immediate its ends a radial flange engaging the inner race of a ball thrust bearing 94. The bearing 94 is held in position by a retainer member 95 carried within the housing 62. A similar retainer member 96 is provided for the front ball bearing 76 and these retainer members 95 and 96 each carry a suitable packing ring 97 for preventing leakage of oil from the drill housing. The controlling mechanism for the drill clutch 73, 74 comprises a pressure plate 98 slidable axially on the exterior periphery of the spider member '75 and engaging the end plate of the series of clutch plates 73, 74. Engaging the pressure plate 98 is a flanged clutch applying member 99, while threadedly connected to the spider member 75 is a flanged reaction member 100. Interposed between the members 99 and 100and encircling the spider member 75 is a coiled spring 101 which constantly forces the member 99 and the pressure plate 98 into clutch applying position. A similar pressure plate 102, clutch applying member 103, reaction member 194 and coiled spring 105 are provided for applying the feed clutch 82, 83. Engaging the clutch ap plying members 99 and 103 for the drill and feed frictions are shipper yokes 106 and 107 respectively, these shipper yokes being pivotally mounted with the drill housing 62. As shown in Fig. 7, the shipper yokes 106, 107 are respectively provided with inwardly projecting arms or levers 1'08, 109 having reduced ends projecting within recesses 110 formed within the hub of an operating lever 111 pivotally mounted at 112 on the exterior of the drill housing 62. When the lever 111 is in the mid-position shown in Fig. 7 the shipped yokes 106 and 107 are in released position and consequently both clutches are automatically applied by the coiled springs 101 and 105. When the lever 111 is swung to the left the arm 108 is swung upwardly and the arm 109 is swung downwardly and as a result the spring 101 is compressed and the drill clutch 73, 74 is released. When the lever 111 is swung in the opposite direction the spring 105 is compressed and the feed clutch 82, 83 is released. i

In this instance the tubular drive member 79 has secured thereto at its forward end a chuck 113 of improved construction. This chuck comprises a casing 114 threadedly connected as at 115 to the member 79. The casing 114 has formed therein a socket 116 having disposed therein a chuck bushing 117 having formed thereon rearwardly projecting teeth 118. The teeth 118 are interlocked with a driving dog 119 which is in turn keyed at 120 to the chuck casing 114. The

teeth 118 on the chuck bushing are disposed within arcuate recesses 121 formed on the dog 119, the recesses being substantially of greater width than the teeth 113 to permit rotation of the chuck bushing relative to the casing 114. As shown, the chuck bushing 117 has formed therein a squared opening 122 which receives a squared shank 123 of a drilling implement herein a drill steel 124. The forward end of the casing. 114 is provided'with a squared opening 125 to permit the insertion of the shank 123 within the chuck. As shown in Fig. 12 the shank of the drilling implement is provided with a peripheral groove 126. Interposed between the locking dog is-adisc or washer 126. In the use of the improved chuck when it is desired to change drill steels, the operator rotatesthe steel, thereby bringing the squared portion thereof into registry with thesquared opening 125, the teeth 118 moving within the recesses 121 during rotation of the steel. The drill steel is then moved longitudinally from the chuck. The drill steel is inserted within the chuck in a similar manner, the operator passing the squared shank of the steel through the squared opening 125 and into the 'squared'opening formed in the chuck bushing 117. The operator then slightly rotates the steel together with the bushing, thereby moving the teeth 118 withinthe recesses and bringing the squared shank out of registry with the opening 125 as indicated in Fig. 13, and locking the steel within the chuck.

I Referringmore particularly to the improved adjustable supporting means for the drilling tool, it willbe observed that the swivel casing 52 within which the rear end of the tubular arm 49 is' rotatably mounted is providedwith arms 127 located at opposite sides of the swivel housing 20 (see Fig. 6).

thereto at 132 link members or arms 133, the latter in turn being pivotally connected at 134 to a trunnion member 135. As clearly shown in Figs. 2 and 5 the trunnion member 135 is slidably mounted within parallel guideways 136 carried by a supporting bracket 137 extending between the arms 133 and herein preferably formed integral with the swivel casing 20. The trunnion 135 is herein in the form of a nut having internal threads 138 cooperating with an adjusting screw 140. The adjusting screw 140 is rotatably mounted within a bearing sleeve 141 carried by the bracket 137 and has fixed there- 'toa ratchetnut 142having external ratchet teeth Cooperating with these ratchet teeth is a reversible pawl 144 suitably secured to a rotatable shaft 145 carried by an operating lever 146, the latter being pivotally mounted on an axis coincident with the axis of the adjusting screw 140. Secured to the shaft 145 is an operating lever 147 whereby the pawl 144 may be shifted from one position to another to permit rotation of the adjusting screw in opposite directions.

As previously pointed out, the drill casing 62 is pivotally connected to the swivel bracket 50,

the latter being secured to the outer end of the supporting arm 49. In order to maintain the drill in its different angularpositions relative to the bracket 50 there is provided a quadrant 149 secured by screws 150 to the drill housing 62. Ihreadedly connected at 151 to the swivel bracket 50 and extending through an arcuate slot 152 (see Fig. 7) formed in the quadrant 149, is a looking or clamping screw 153 having fixed thereto at 154 an operating lever 155. It is accordingly evident that when it is desired to swing the drill relative to the swivel bracket 50 the operator loosens the clamping screw 153 and swings the drill about its pivot. After the drill has been suitably positioned the locking screw is again tightened, thereby clamping the quadrant 149 rigidly to the side of the swivel bracket 50. Improved means are provided for bodily rotating the drill about the axis of the tubular supporting arm 49 which, as previously pointed out, is rotatably supported within the housing 52. This drill rotating means comprises a worm gear 156 keyed at 157 to the tubular supporting arm 49 (see Figs. 2 and 3). Meshing with the worm gear 156 is a worm 158 secured to a transversely extending shaft 159 journaled in ball bearings 160 carried by the housing 52. The worm gearing is self-locking and maintains the drill in its different adjusted positions. Secured to this shaft 159 is an operating handle 161. When it is desired to bodily rotate the drill, for instance from the full line position shown in Fig. 9 to the dotted line position, the operator merely grasps the handle 161 and rotates the worm gearing 156, thereby turning the supporting arm 49, together with the drill supported thereby, within the bearings 51.

In the operation of the improved drilling tool the coal cutting machine is run into the entry, and when the coal face is reached the cutter bar is swung into position at the right hand side of the entry. The cutter bar is then sumped into the coal face and thereafter swung from one side of the entry to the other, thereby undercutting the face. The operation of the coal cutting machine is clearly described in my copending application which has now matured into Patent 1,785,961, granted December 23, 1930 mentioned above. After the swinging cut is completed the motor is stopped and the cutting mechanism is disconnected therefrom. While the cutter bar is beneath the coal the operator grasps the ratchet lever 146 and oscillates the same, and as a result the adjusting screw 140 is rotated, moving the trunnion 135 rearwardly, thereby swinging the supporting arm 49 together with the drilling tool upwardly about its horizontal pivot on the casing 20, from the full line position shown in Fig. 1 to the full line position shown in Fig. 15. The clamping screw 153 is then loosened and the drill swung into the desired angular position relative to the supporting arm 49, the drill thereafter being rigidly clamped to the swivel bracket 50. The operator manipulates the lever 38 swinging the shipper yoke and sliding the clutch member 29 axially, thereby connecting the clutch teeth 28 and 28 on the drive shafts 18 and 26 together, and as a result the drilling tool is connected to the driving motor. The operator then starts the motor and thereafter grasps the lever 111 and releases the feed clutch 82, 83, and the drilling tool is fed forwardly at a relatively high speed until it engages the coal. The drill is driven at that time through the gearing 1O, 11, the bevel gearing 15, 16, 40, 41, 44, shaft 46, the bevel gearing including the gears 56 and 64, the gearing 67, 69 through the friction clutch 73, 74 and the spider 75 splined to the drive member 79, and as a result the latter is rotated relative to the then stationary feed screw 89. After the drilling tool is suitably positioned relative to the working face the clutch lever 111 is released by the operator and the clutches 72, 73 and 82, 83 are then both applied by the coiled springs 101 and 106 respectively. As a result both the spider member 75 and the spider member 84 are driven through the gearing 67, 69 and 68, 70 respectively, and consequently both the drive member 79 and the feed screw 89 are rotated in the same direction. As the gears 69, 71 are of diiferent size the member 79 is rotated at a differential speed with respect to the feed screw 89. The gearing is so proportioned that when the gears 69 and 70 are simultaneously rotated the tubular drive member 79 which carries the chuck 113 for the drill steel rotates at a speed faster than the rate of rotation of the feed screw, and as a result the member 79 is fed slowly outwardly relative to the feed screw 89. After the "shot hole is completed the operator releases the drill clutch 73, 74 and as a result the feed screw 89 is rotated relative to the then stationary drive member 79, and consequently the tubular drive member is fed rearwardly at a relatively high speed. During the drilling operation if an unduly hard substance is encountered, for instance a sulphur ball, rotation of the drill steel is resisted, and when the resistance to rotation exceeds a predetermined amount the drill clutch 73, 74 slips and as a result when the speed of rotation of the drive member 79 becomes less than the speed of rotation of the feed screw 89 the drill steel is automatically retracted from the face due to the differential action between the two driven elements. When the drill steel is again free to rotate, the speed of rotation of the member 79 is increased and the drill steel is again advanced toward the work at a slow speed until it is again resisted, this operation being repeated until the hard material is penetrated. It is therefore obvious that the possibility of steel breakage is materially diminished. If it is desired to swing the drill tool about the axis of the tubular supporting arm 49 the operator merely rotates the crank 161, thereby actuating the worm gearing and rotating the arm 49 within its bearings 51. As the worm gearing is self -locking the tubular arm is held in its different adjusted positions thereby. It will also be noted that when it is desired to swing the drill from the full line position shown in Fig. 16 to the dotted line position, this may be accomplished merely by swinging the casing 20 about the axis of the shaft 18. After the drilling operation is completed the cutter bar is retracted from the face in a well known manner, the mining machine and drill then being transported to a different working place. Various other adjustments and uses of the improved drilling tool will be clearly apparent to those skilled in this art.

While I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a drilling mechanism, a frame, an elongated boom structure pivotally mounted on said frame and including a swingable boom support having an upstanding projection thereon, a drilling tool carried at the outer extremity of said boom structure, and devices for swinging said boom structure about its pivot relative to said frame including cooperating screw and nut elements having relative rotative and rectilinear movement, means for rotating one of said elements to effect rectilinear movement of the other, and connections between said rectilinearly movable element and said upstanding projection.

2. In a drilling mechanism, a frame, an elongated boom structure pivotally mounted on said frame and including a swingable boom support having an upstanding projection thereon, a drilling tool carried at the outer extremity of said boom structure, and devices for swinging saidboom structure about its pivot relative to said frame including cooperating screw and nut elements having relative rotative and rectilinear said rearwardprojection, a' link pivotally .con-

movement, a pivoted link connecting said rectilinearly movable element to the upstanding projection on said boom support, and means for rotating the rotatable one of said elements to 1 effect rectilinear movement of the other.

3. In a drilling mechanism, a frame, an elon-' gated boom structure pivotally mounted on said frame and including a swingable boom support having an upstanding projection thereon, adrilling tool carried at the outer extremity of said jection on the boom support, a rearward projecboom structure, and devices'for swingingsaid boom structure about its pivot relative to said frame including a guideway on said frame, a nut element slidably guided in said guideway, a screw element journaled on said frame and engaging said nut element, means for rotating said screw element, and connections between said nut element and said upstanding projection.

4. In a drilling mechanism, a frame, an elongated boom structure pivotally mounted on said frame and including a swingable boom support having an upstanding projection thereon, a drilling tool carried at the outer extremity of said boom structure, and devices for swinging said boom structure about its pivot relative to said frame including a guideway on said frame, a nut element slidably guided in said guideway, a screw element journaled on said frame and engaging said nut element, a link pivotally connected to said sliding nut element and to said upstanding projection on said boom support, and means for rotating said screw element.

5. In a drilling mechanism, a frame, an elon-' gated boom structure pivotally mounted on said frame and including a swingable boom support and a boom rotatably mounted on said support, a drilling tool carried at the outer extremity of said boom and rotatable therewith relative to said boom support, and devices for swinging said boom structure about its pivot relative to said frame including boom swinging means arranged at the side of the boom pivot remote from said drilling tool and connected between said frame and the upper side of said boom support and having a pivotal connection with the latter.

6. In a drilling mechanism, a frame, 'an elongated boom structure pivotally mounted on said frame, a drilling tool pivotally mounted on the outer extremity of said boom structure to swing relative thereto in longitudinal planes including the longitudinal axis of the boom structure, and means for adjusting said boom structure to move the drilling tool into drilling positions above'and below the boom structure.

7. In a drilling mechanism, a frame, an elongated boom structure mounted on said frame for gated boom 'structuresupported by saidboom support, a drilling tool carried at the outer extremity of said boom structure,anddevicesfor swinging said boom support about its pivot relative to said frame includingan upstanding projection on the boom support, a rearward projectionon said frame and'having a.guideway,ia nut slidable inxsaid guideway, a screw journaled on nectedto said nut and said upstanding projection, and means for rotating said screw. g

9. In a drillingmechanism, a frame, a-boom supportpivotally mounted on said frame, an elongated boom structure supported by said boom su'pport,-a drilling tool carried at the outer extremity of said boorri structure, and devices for swinging said boom support about its pivot relative tosaid frame including an upstanding protion on said frame and having a guideway, cooperating adjusting elements having relative rotative and rectilinear -movement,* said rectilinearly movable element being guided in said guideway and the other element being "journ'aled on said upstanding proj ection, and said other element. i

' 10. In a drilling mechanism, a frame, an elonhaving an upstanding projection thereon, a drilling tool carried at'the outer'extremity of'said boom structure and devices for swinging said boom structure aboutits pivot relative to said frame including cooperating relatively reciprocable adjusting elements, and a connection betweenthe reciprocable adjusting element and said upstanding projection.

11. In a drilling mechanism, a frame, a boom support pivotally mounted on said frame,'an elong 30 I gated boom structure pivotally mounted on said frame and includinga swingable boom support gated boom structure'supported by. said boom tive to said frame including an upstanding projection on said boom support, a rearward projection on said, frame,'cooperating relatively reciprocable adjusting elements mounted on said.

frame projection, and a connection betweenthe reciprocable adjusting element and said upstand-f ing projection.

12. In a drilling mechanism, a support, a frame swiveled on said support, an elongated boom structure pivotally mounted on saidswivel frame,

a drilling tool mounted'on' the outer extremity of said boom structure, a motor mounted on said support a'ndr'elative to which said boom structure is swingable, and driving connections between said motor and said drilling tool including alined shafts arranged with their axes coincident with the swivel frame axis, and a clutch device arranged within saidi'swivel frame for connecting said shafts in driving relation, and clutch operture pivotally mounted on said swivel frame, a

drilling tool mounted on the'outer extremity of said boom structure, a motor mounted on said support and relative to which said boom structure -is swingable, and driving connections between said motor and said drilling tool including alined shafts arranged with their axes coincident with the swivel frame axis, a clutch device arranged within said swivel frame for connecting said shafts in driving relation, clutch operating means including a manual control element arranged exteriorly of said frame, and an element actuated by said control element and arranged with its axis coincident with the pivotal axis of said boom structure and extending within said frame and operatively connected to said clutch device.

14. In a drilling mechanism, a wheeled support, a horizontally rotatable turntable member supported thereon, a boom member pivotally supported at one end thereof upon said turntable for tilting movement about a horizontal axis, said boom member carrying a drill at its opposite end, and means for tilting said boom member upon said axis disposed, when said boom is horizontal, in planes above said horizontal axis and supported by said boom and turntable members, including upon one of said members a screw and a nut supported for longitudinal movement along said screw, link means connected pivotally to said nut at one end, and, upon said other member, a second pivotal connection for the other end of said link means.

15. In a drilling mechanism, a wheeled support, a horizontallyrotatable turntable member supported thereon, a boom member pivotally supported at one end thereof upon said turntable for tilting movement about a horizontal axis, said boom member carrying a drill at its opposite end, said drill pivotally connected to said last mentioned end of said boom, a motor, driving connections for said drill actuated by said motor and including a shaft extending through and rotatable within said boom, and means for tilting said boom member upon said axis disposed, when said boom is horizontal, in planes above said horizontal axis and supported by said boom and turntable members, including upon one of said members a screw and a nut supported for longitudinal movement along said screw, link means connected pivotally to said nut at one end, and, upon said other member, a second pivotal connection for the other end of said link means.

16. In a drilling mechanism, a portable support, an elongated boom structure, a drilling tool carried on the outer extremity of said boom structure, a pivotal mounting for the rear-end of said boom structure on said support including relatively swingable supporting members, one rotatable about a vertical axis and the other swingable about a horizontal axis, and mechanism for swinging said member about said horizontal axis to swing said boom structure in a vertical direction relative to said member rotatable about a vertical axis and including an upstanding projection on one member, a guideway onthe other member, a trunnion nut slidable along saidguideway, a screw engaging said nut, a pivoted link connection between said nut and said upstanding projection, and means for rotating said screw.

17. In a drilling mechanism, a portable support, an elongated boom structure,a drilling tool carried on the outer extremity of said boom structure, a pivotal mounting for the rear end of said boom structure on said support including relatively swingable supporting members, one rotatable about a vertical axis and the other swingable about a horizontal axis, and mechanism for swinging said member about said horizontal axis to swing said boom structure in a vertical direction relative to said member rotatable about a vertical axis and including a guideway on one member, a trunnion nut slidable along said guideway, a screw engaging said nut, a link arranged above the boom pivot mounting and pivotally connected to said nut and to the upper portion of said other member, and means for rotating said screw.

18. In a drilling apparatus, a motor, a support, a swinging arm, a drive shaft within said swinging arm connectible with said motor, a drilling head mounted on said arm for adjusting movement with respect thereto about an axis coincident with the longitudinal axis of said arm and about an axis perpendicular to said longitudinal axis, a drill holding and advancing member carried on said head, a drill carried within said drill holding and advancing member, and mechanism connectible with said drive shaft carried within said arm for imparting simultaneous translational and rotational movement to said drill holding and advancing member and operable while said motor runs in one direction to effect drill feed or drill retraction selectively.

19. In an apparatus of the class described, a portable support, a motor on the forward end of said support, an arm rocking on the rearward end of said support, a drilling head mounted on said arm, means for supporting said drilling head on said arm whereby said drilling head may be rotated about said arm or moved angularly with respect to said arm, a drill holding and advancingmember movable in said head, a drill carried within said drill holding and advancing member, and means for driving said drill from said motor through said rocking arm in the several permissible positions of adjustment of said arm with respect to said drill.

20. In a drilling apparatus, a support including a mining machine, said mining machine including a motor, a forwardly extending cutter bar, plural speed feeding mechanism rearwardly of said cutter bar, means for driving said plural speed feeding mechanism from said motor, a swinging arm supported on said mining machine, drilling mechanism including a drilling head supported on the free end of said swinging arm for adjustment about axes coincident with and perpendicular to the longitudinal axis of said swinging arm, said drilling head including a drill holding and advancing member, a drill supported by said drill holding and advancing member, and drive mechanism connectible with said means for driving said plural speed feeding mechanism from said motor for imparting independent or simultaneous translational and rotational movement to said drill holding and advancing member.

21. In a drilling apparatus, a support including a mining machine, said mining machine including a motor, a forwardly extending cutter bar, plural speed feeding mechanism rearwardly 'Of said cutter bar, means for driving said plural speed feeding mechanism from said motor, a swinging arm supported on said mining machine, drilling mechanism including a drilling head supported on the free end of said swinging arm for adjustment about axes coincident with and perpendicular to the longitudinal axis of said swinging arm, said drill-head including a drill holding and advancing member, a drill supported by said drill holding and advancing member, and drive mechanism connectible with said means for driving said plural speed feeding mechanism from said motor for imparting independent or simultaneous translational and rotational movement to said drill holding and advancing member includpivotal movement Withrespect thereto ,about a. transverse axis and an axis disposed perpendicum larly to said transverse axis, drilling mechanism supported on the opposite end of said arm for adjustable movement with respect thereto about the longitudinal axis of said arm and about an axis disposed perpendicularly to said longitudinal axis, and means driven by said motor and in-, cluding means carried within said arm for drivving and selectively oppositely feeding said drilling mechanism from said motor in all positions of adjustment of said drilling mechanism and arm with respect to said truck and whileinotor rotation is in one direction.

23. In combination, a coal cutting machine comprising a portable base having a forwardly projecting kerf, cutting mechanism thereon, a drill supporting structure pivotally mounted at its rear end on said base at the rear of said cutting mecha- .nism, said supporting structure being swingable horizontally from one side of said base to'the other into positions wherein the outer extremity of saidv supporting structure overhangs the sides of the base, said supporting structure also swingable in a vertical direction relative to the base, and a drilling tool swivelly mounted on the outer overhanging extremity of said supporting structure and supported entirely by the latter during aforesaid adjustments thereof, said supporting structure being horizontally swingable as aforesaidto position the drilling tool to drill holes in the coal face at either side of the coal cutting machine and swingable vertically to drill horizontal holes at different elevations with respect to the coal cut tudinal vertic'alplane of the base and swingable ting machine.

24. In combination, a coal cutting machine comprising a portable base having a forwardly projecting ke-rf cutting mechanism thereon, a drill,

of said supporting structure overhangs the sides .of the base, said supporting structure also swingable in a vertical direction relative to the base, a drilling tool swivelly mounted on the outer overhanging extremity of said supporting, struc-' ture and supported entirely by the latter during,

aforesaid adjustments thereof, said supporting structure being horizontally swingable as aforesaid to position the drilling tool to drill holes in the coal face at either-side of the coal cutting machine and swingable vertically to drill horizontal holes at different elevations with respect to the coal cutting machine, and a motor on said base and relative to which said supporting structure is swingable for driving said kerf cutting mechanism and for actuating said drilling tool.

25. In combination, a mining machine comprising a portable base having forwardly projecting kerf cutting mechanism thereon, a boom pivotally mounted on said base at the rear of said kerf cutting mechanism and swingable horizontally from one side of said base to the other, and a drilling tool swivelly mounted on the outer extremityof said boom and supported entirely by the latter during aforesaid adjustment thereof, said boom being swingable horizontally as aforesaid to position said drilling tool to drill horizontal holes in the coal face at either side ofthe mining machine.

26. In combination, a mining machine comprising a portable base having forwardly projecting ke-rf cutting mechanism thereon, a boom pivotally mounted on said base at the rear of said kerf cutting mechanism and swingable horizontally from one side of said base to the other, a drilling tool swivelly mounted on the outer extremity of said boom and supported entirely by the latter duringafor'esaid adjustment thereof, said boom beingswingable horizontally as aforesaid to position said drilling tool to drill horizontal holes in the coalface at either side of the mining machine, and a motor on said base for driving said kerf cutting mechanism and for actuating said drilling tool. I

, 27. In combination, a-mining machine comprising a portable base having forwardly projecting kerf cutting mechanism thereon, a'boom pivotally mounted at its rear end on said base at the rear of said cutting mechanism to swing horizontally about a, vertical axislying in the central longitudinal vertical plane of the base .andswingable from one side of saidbase to the other in positions wherein the outer. extremity ofsaid boom overhangs the sides of said base, and a drilling tool swivellymounted on the outer overhanging ex tremity of said boom and supported entirely by the latter during aforesaid adjustment thereof,

said boom being swingable horizontally as aforesaidto position said. drilling tool to drill horizontal holes in the coal face at either side of the mining machine.

28. In combination, a mining machine comprising a portable base having forwardlyprojecting kerf cutting mechanism thereon, a boom pivotally mounted at its rear end on said base at the rear of said cutting mechanism to swing horizontally about a vertical axis lying in the central longifrom one side of said base to the other in positions wherein the outer extremity of said boom overhangs the sides of said base adjacent the sides of said cutting mechanism, and a drilling tool. swivelly mounted on the outer overhanging extremity of said boom and supported entirely by the latter during aforesaid adjustment thereof, said boom being swingable horizontally as aforesaid to position said drilling tool to drill horizontal holes in the coal face at either side of the mining machine.

29. In combination, a mining machine comprising a portable base having forwardly projecting kerf cutting mechanism thereon, a boom pivotally mounted at its rear end on said base at the rear of said cutting mechanism to swing horizontally abouts. vertical axis lying in. the central longitudinal vertical planeof the base and swingable from one side of saidbase to the other in positions wherein the outer extremity of said boom overhangs the sidesof said base, a drilling tool swivel- 1y mounted on the outer overhanging extremity of said boom and supported entirely by the latter during aforesaid adjustmentthereof, said boom being swingablehorizontally as aforesaid to position said drilling tool to drill horizontal holes in the coal face at either side of the mining machine, and a motor on said base for driving said kerf cutting mechanism and for actuating said drilling tool.

30. In combination, a mining machine compivotally mounted at its rear end on said base at the rear of said cutting mechanism to swing horizontally about a verticalaxis lying in the central longitudinal vertical plane of the base and swingable from one side of said base to the other into positions wherein the outer extremity of said boom overhangs the sides of said base, said boom also being swingable in a vertical direction relative to said base, and a drilling tool swingably mounted on the outer overhanging extremity of said boom and supported entirely by the latter during aforesaid adjustment thereof, said boom being swingable horizontally as aforesaid to position said drilling tool to drill horizontal holes in the coal face at either side of the mining machine.

31. In combination, a mining machine comprising a portable base having forwardly projecting kerf cutting mechanism thereon, a boom pivotally mounted at its rear end on said base at the rear of said cutting mechanism to swing horizontally about a vertical axis lying in the central longitudinal vertical plane of the base and swingable horizontally from one side of said base to the other into positions wherein the outer extremity of said boom overhangs the sides of said base, said boom also being swingable in a vertical direction relative to said base, a drilling tool swingably mounted on the outer overhanging extremity of said boom and supported entirely by the latter during aforesaid adjustments thereof, said boom swingable horizontally as aforesaid to position said drilling tool to drill horizontal holes in the coal face at either side of the mining machine and swingable vertically to drill horizontal holes in the coal face at different elevations with respect to the mining machine, and a motor on said base for driving said kerf cutting mechanism and for actuating said drilling tool.

32. In a drilling apparatus, a portable base, a boom pivotally mounted at its rear end on said base a substantial distance to the rear of the forward end of said base, the forward extremity of said boom terminating at the rear of the forward end of said base, said boom swingable into positions wherein the forward extremity of said boom overhangs the sides of said base, a drilling tool swivelly mounted on the outer overhanging extremity of said boom and supported entirely by the latter during aforesaid adjustment thereof, said boom being swingable horizontally as aforesaid to position said drilling tool to drill horizontal holes in the coal face at either side of the portable base, and a motor on said base and relative to which said boom is swingable for driving said drilling tool.

33. In a drilling apparatus, a portable base, a boom pivotally mounted at its rear end on said base a substantial distance to the rear of the forward end of said base, the forward extremity of said boom terminating at the rear of the forward end of said base, said boom swingable horizontally into positions wherein the forward extremity of said boom overhangs the sides of said base, said boom also swingable in a vertical direction relative to said base, a drilling tool swivelly mounted on the outer overhanging extremity of said boom and supported entirely by the latter during aforesaid adjustments thereof, said boom swingable horizontally as aforesaid to position said drilling tool to drill horizontal holes in the coal face at either side of the portable base and swingable vertically to drill horizontal holes in the coal face at different elevations with respect to the base, and a motor on said base and rela tive to which said boom is swingable for driving said drilling tool.

34. In combination, a coal cutting machine comprising a portable base having a forwardly projecting kerf cutting mechanism thereon adapted to move laterally to effect its cutting function, a drill supporting structure pivotally mounted at its rear end on the rearward portion of said base, said supporting structure being swingable in a vertical direction relative to said base to adjust the drill into different elevated positions above said cutting mechanism, and a drill swingably carried at the outer extremity of said supporting structure and having feeding means for feeding a drilling implement in an axial direction relative to the base and supporting structure, said supporting structure being swingable vertically as aforesaid and said drill swingable relative to said supporting structure into positions to drill a series of parallel horizontal holes in the coal face in planes above the top of the coal cutting machine.

35. In combination, a coal cutting machine comprising a portable base having a forwardly projecting kerf cutting mechanism thereon adapted to move laterally to effect its cutting function, a drill supporting structure pivotally mounted at its rear end on the rearward portion of said base and arranged at the top of the latter, said supporting structure being swingable in a vertical direction relative to said base to adjust the drill into different elevated positions above said cutting mechanism, and a drill swingably carried at the outer extremity of said supporting structure and having feeding means for feeding a drilling implement in an axial direction relative to the base and supporting structure, said supporting structure being swingable vertically as aforesaid and said drill swingable relative to said supporting structure into positions to drill a series of parallel horizontal holes in the coal face in planes above the top of the coal cutting machine.

36. In combination, a coal cutting machine comprising a portable base having a forwardly projecting kerf cutting mechanism thereon adapted to move laterally to effect its cutting function, a drill supporting structure pivotally mounted at its rear end on the rearward portion of said base, said supporting structure being swingable in a vertical direction relative to said base to adjust the drill into different elevated positions above said cutting mechanism, a drill swivelly mounted at the outer extremity of said supporting structure and having feeding means for feeding a drilling implement in an axial direction relative to the base and supporting structure, said supporting structure being swingable vertically as aforesaid and said drill swingable relative to said supporting structure into positions to drill a series of parallel horizontal holes in the coal face in planes above the top of the coal cutting machine.

37. In combination, a coal cutting machine comprising a portable base having a forwardly projecting kerf cutting mechanism thereon, a drill supporting structure swivelly mounted at its rear end on the rearward portion of said base to swing horizontally and vertically relative to said base to adjust the drill into different elevated and lateral positions above the cutting mechanism, a drill mounted at the outer extremity of said supporting structure to swing about an axis coincident with the longitudinal axis of said supporting structure, said drill also being swingable relative to the supporting structure about an axis at right angles to said longitudinal axis, a motor on said base in advance of the pivotal connection of the rear end oi'saidsupporting structure with said base, and driving connections between said motor and the drill including connections extending along the longitudinal "axis of said su porting structure. I v

38. In combination, a miningmachine adapted toeffect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position to cut a kerf nearthe mme noor into a top cutting positionwent a kerf a-'sub stantial distance above theminefloor, a drill porting-structure pivotally mounted at its rear end on the mining machine at the rear of said adjustable kerf cutting mechanism, said supporting structure being swingable horizontally from one side of the mining machine to the other into positions wherein the outer extremity of said supporting structure overhangs the sides of the mining machine, said supporting structure also swingable in a vertical direction relative to the mining machine, and a drilling tool swivelly mounted on the outer overhanging extremity of said supporting structure and supported entirely by the latter during aforesaid adjustments thereof, said supporting structure being adjustable as aforesaid in either adjusted position of said kerf cutting mechanism to position the drilling tool to drill parallel horizontal holes in the coal face at either side of the mining machine and at different elevations with respect to the mining machine.

39. In combination, a mining machine adapted to effect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a horizontal cutting position to cut a horizontal kerf in the coal face and into a vertical cutting position to cut a vertical kerf in the coal face, a drill supporting structure pivotally mounted at the rear end of the mining machine at the rear of said adjustable kerf cutting mechanism, said supporting structure being swingable horizontally from one side of said base to the other into positions wherein the outer extremity of said supporting structure overhangs the sides of the mining machine, said supporting structure also swingable in a vertical direction relative to the mining machine, and a drilling tool swivelly mounted on the outer overhanging extremity of said supporting structure and supported entirely by the latter during aforesaid adjustments thereof, said supporting structure being horizontally swingable as aforesaid to position the drilling tool to drill parallel horizontal holes in the coal face at either side of the vertical kerf when said kerf cutting mechanism is in aforesaid vertical cutting position and swingable vertically to drill horizontal holes at different elevations with respect to the horizontal kerf when said kerf cutting mechanism is in aforesaid horizontal cutting position.

40. In combination, a mining machine adapted to effect its cutting function while supported and guided by a mine trackway and having kerf cutting mechanism adjustable into a bottom cutting position to cut a horizontal kerf near the mine floor, into a top cutting position to cut a horizontal kerf a substantial distance above the mine floor and into a. vertical cutting position to cut a vertical kerf between the mine roof and mine floor, a drill supporting structure pivotally mounted at its rear end on the mining machine at the rear of said adjustable kerf cutting mechanism, said supporting structure being swingable horizontally from one side of the mining machine to th'etother into positionswnreiri the outer. extremity of said supporting structure overhangs the sidesof th'e mining machine, said supporting structure also swingable in a vertical direction relative to the mining machine, and a drilling tool swivelly mounted on the outer overhanging extremity of said supporting structure and sup: ported entirely by the latter during aforesaid ad-" justments thereof, said supporting structure being horizontally swingable as aforesaidtdp'o'si tionthe drilling tool to drill parallel horizontal holes the coal faceat'fei'ther side or the vertical'kerf whens'aid-kerf'cutting meenanism is in aforesaid vertical cutting position and swingable vertically to drill horizontal holes in the coal face at different elevations with respect to said horizontal kerfs when saidkerf cutting mechanism is inaforesaid bottom and top cutting positions.

41. In combination, a coal cutting machine comprising a portable base having a forwardly projecting kerf cutting mechanism thereon adapted to move laterally to effect its cutting function, a drill supporting structure pivotally mounted at its rear end on the rearward portion of said base, said supporting structure being swingable in a vertical direction relative to the base to adjust the drill into different elevated positions above said cutting mechanism and swingable in a horizontal direction relative to the base to adjust the drill into difierent lateral positions at opposite sides of the cutting mechanism, and a drill swivelly mounted at the outer extremity of said supporting structure and entirely supported thereby during aforesaid horizontal and vertical swinging movements of said supporting structure, said drill having feeding means for feeding a drilling implement in an axial direction relative to the base and supporting structure in any of aforesaid adjusted positions of the latter.

42. In combination, a coal cutting machine comprising a portable base having a forwardly projecting kerf cutting mechanism thereon adapted to move laterally to effect its cutting function, a drill supporting structure pivotally mounted at its rear end on the rearward portion of said base and arranged at the top of the latter, said supporting structure being swingable in a vertical direction relative to said base to adjust the drill into different elevated positions above said cutting mechanism and swingable in a horizontal direction relative to the base to adjust the drill horizontally over the top of the base into different lateral drilling positions at the sides of said cutting mechanism, and a drill carried at the outer extremity of said supporting structure and entirely supported thereby during aforesaid adjustments thereof, said drill having feeding means for feeding a drilling implement in an axial direction relative to the base and supporting structure in any of aforesaid adjusted positions of the latter.

43. In combination, a coal cutting machine comprising a portable base having a forwardly projecting kerf cutting mechanism thereon adapted to move laterally to effect its cutting function, a drill supporting structure pivotally mounted at the rear end of said base, said supporting structure being swingable in a vertical direction relative to said base to adjust the drill into different elevated positions at the opposite sides of the cutting mechanism, a drill swivelly mounted at the outer extremity of said supporting structure and entirely supported thereby during aforesaid adjustments thereof, said drill having feeding means for feeding a drilling implebase to adjust the drill into different elevated positions above said cutting mechanism, and a drill carried at the outer extremity of said supporting structure and having feeding means for feeding a drilling implement in an axial direction relative to the base and supporting structure, a motor on said base in advance of the pivotal connection of the rear end of said supporting structure with said base, and driving connections between said motor and the drill including connections extending along the longitudinal axis of said supporting structure.

MORRIS P. HOLMES.

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