US1685403A

US1685403A - Mining machine

Info

Publication number: US1685403A
Authority: US
Publication date: 1928-09-25
Anticipated expiration: 1945-09-25

Description

Sept. 25, 1928.

M. P. HOLMES MINING MACHINE Original Filed Nov. 1. 1918 8 Sheets-Sheet 1 Q 111)8702'07. 5780172191 Halwwo.

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M. P. HOLMES MINING MACHINE Original Filed Nov. 1, 1918 8 Sheets-Sheet 8 1 7/ 47 17 94L 9 I Z9 31 95- i I 9/ g7 26 i: I 146 I i I 14 I 7 l i i I l l 1 l l 14 Z9 I I I I l I l l I I iuvezziorr atz y.

Patented Sept. 25, 192 8.

UNITED STATES PATENT OFFICE.

MORRIS P. HOLMES, OF CLABEMONT, NEW HAMPSHIRE, ASSIGNOB TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

Emma MACHINE.

Application filed November 1, 1918, Serial No. 260,708. Renewed November 6, 1926.

This invention relates to mining machines, and especially to coal mining machines of the type comprising a flat cutter bar provided with a continuously running cutter chain, al-

though not necessarily limited to machines of this type.

The invention has for its general object to provide an improved machine of practical design adapted to cut a kerf in the mine face in substantially any desired plane within the range of operation of the machine.

Another object of the invention is to provide improved propelling mechanism for machines of the character referred to, whereby the machine may be propelled from place to pla e about the mine, and whereby the necessary movements of the machine during the cutting operation may be produced and controlled.

The foregoing and other objects of the invention, together with means whereby the same may be carried into effect, will best be understood from the following description of one form or embodiment thereof which I have shown for purposes of illustration in the accompanying drawings.

In said drawings,-

Figure 1 is a side elevation of the complete machine.

Fig. 2 is a plan view thereof.

Fig. 3 is an enlarged longitudinal section taken substantially on the line 3 3. Fig. 2, of the multiple turret head by which the cutter bar is movably carried.

Figs. 4 and 5 are sections taken substantially on the lines 4-4 and 55, respectively, Fig. 3.

Fig. 6 is a detail view of the means for lock.- ing the cutter bar with respect to the head.

Fig. 7 is a transverse horizontal section taken substantially on the line 7 7, Fig. 1.

Figs. 8, 9, and 10 are vertical sections taken substantially on the lines 8-8, 99. and 10-10, respectively. Fig. 7, parts being omitted in Figs. 9 and 10.

Fig. 11 is a detail i-rtical section taken subtantially on the line 11-11, Fig. 12.

Fig. 12 is a transverse vertical section taken substantially on the line 1212, Fig. 1.

Figs. 13 and 14 are transverse vertical sections taken substantially on the lines 13-13 and 1414, respectively, Fig. 1.

Fig. 15 is a diagrammatic plan View illustrating the operation of the machine in cutting a horizontal kerf in a mine face in the operation of driving an entry.

Figs. 16 and 17 are diagrammatic views in, side elevation illustrating the operation of the machine in undercutting and top cutting, respectively.

Fig. 18 is a diagrammatic view illustrating some of the possible adjustments of the cutter bar.

Fig. 19 is a diagrammatic plan view illustrating the operation of the machine in shearing, or inserting a vertical kerf in the mine face.

Fig. 20 is a diagrammatic plan view illustrating the use of the machine as a mounted longwall machine.

Fig. 21 is a diagrammatic view, in end elevation, illustrating the machine operating as a mounted longwall machine in cutting an inclined kerf in a face at one side of the trackway.

Referring first to Figs. 1 and 2, the apparatus as a whole comprises a truck, consisting of a truck body 25 mounted on wheels 26 adapted to run upon a suitable trackway 27, upon which truck is mounted the mining mechanism including a motor casing 28 and a forwardly extending cutter bar 29 provided with the usual cutter chain 30, said cutter bar being supported from said casing by means hereinafter more fully described.

In order to permit adjustment of the cutter bar 29 with respect to the trackway 27 about a transverse horizontal axis, the rear axle 31 of said truck, as herein shown, is journaled in boxes 32 (see Figs. 11 and 12) mounted in guideways in depending brackets 34 carried by the truck body 25, whereby said axle and truck body are relatively vertically movable, said truck body during such vertical movement turning about the axis of the front axle 35. For the purpose of relatively adjusting the truck body 25 and axle 31 and of retaining the parts in adjusted position, said axle, as herein shown, is provided with a collar 37 (see also Figs. 13 and 14) to which is 100 secured. as by a pin 38, a screw 39 cooperating with a nut 40 rotatably mounted in an openin; in the top of the truck body 25, and retained in place therein by means of annular plates 41 and bolts 42, said nut being provided with a hand wheel 43. As will be seen, by rotation of the hand wheel 43 the rear end of the truck may be raised or lowered with respect to the rear axle 31.

Within the casing 28 is the usual electric or other motor, governed by a suitable controller 44 conveniently accessible to an operator standing upon the platform 45 carried by the truck body, said motor being supplied with current through a cable 46 wound upon a reel 47 journaled in uprights 48 carried by the truck body, said reel being electrically connected with the motor by conductors 49 and, as is usual in machines of this character, being rotated by means hereinafter referred to to wind up or pay out the cable 46 as the truck is propelled in one direction or the other along the track 27.

The motor shaft 50 (see Fig. 8) extends rearwardly from the main casing 28 into a supplemental casing 51 and has keyed thereto within the latter casing a pinion 52 and a worm 53, the latter having a hub 54 journaled in a suitable bearing in the casing 51. The worm 53 meshes with a worm gear 55 loosely mounted on a transverse driving shaft 56 (see also Fig. 7) said worm gear being adapted to be clutched to said shaft by means hereinafter described, whereby said shaft may be rotated at a relatively high speed from the motor shaft 50. The shaft 56 is journaled adjacent one end in a bearing 77 carried by the casing 51, and at its opposite end in a bearing 78 carried by a member 75 forming the opposite end of said casing and secured thereto by bolts 79.

Fast upon one end of the shaft 56 is a sprocket 57 connected by a chain 58 (Figs. 1, 2, and 13) with a sprocket 59 on the forward axle 35, whereby, by properly reversing or otherwise controlling the motor through the controller 44, the truck may be propelled along the track 27 in either direction. Fast upon the opposite end of the shaft 56 is a' drum 60 adapted to receive a cable 61 which may be attached at its free end to a jack or other fixed support to assist in propelling the truck up steep grades or in other diflicult places. Beyond the drum 60, the shaft 56 is provided with a loose sprocket 62 (see Figs. 2, 13 and 14) adapted to be connected therewith b a suitable clutch 63 and connected by a 0 Iain 64 with a sprocket on the shaft 65 of the reel 47, whereby said reel may be rotated, as above explained, to wind up or pay out the cable 46.

The pinion 52 meshes at opposite sides with gears 66 and 67 (see Fig. 7) loosely mounted on the

stub shafts

68 and 69 and having extended sleeve-like hubs formed with worms 7 0 and 71 (see Figs. 9 and 10) which mesh, respectively, with

worm gears

72 and 73 loosely mounted on the shaft 56 but adapted to be clutched thereto, as hereinafter more fully described. The worms 70 and 71 are of opposite pitch, whereby the worm gears 72 and 73 are rotated in opposite directions, and are preferably of less steep pitch than the Worm 53, While the gears66 and 67 are larger than the pinion 52, so that said gears 72 and 73 are-rotated at a relatively slow speed with respect to the speed of rotation of the gear 55. The gear 55, when clutched to the shaft 56, is employed for propelling the truck from place to place about the mine at a relatively high speed, while the gears 72 and 7 3, when clutched to said shaft, are employed for moving the truck at a relatively slow speed in one direction or the other during the cutting operation. For selectively connecting the

ears

55, 72, and 73 to the shaft 56, and a so for disconnecting all of said gears and holding said shaft, and consequently said truck, stationary, the following mechanism is provided.

Keyed to the shaft 56 between the gears 55 and 72, is a hub 74 (Fig. 7), while keyed to said shaft between the gear 7 3 and the member 75, is a second similar hub 76. Interposed between the hub 74 and. the gears 55 and 72 are

multiple disk clutches

80 and 81, respectively, while interposed between the hub 76 and the gear 73 and member are

similar clutches

82 and 83. The

clutches

80 and 81 may be alternatively set, to connect the gear 55 or the gear 72 with the hub 74, by means of a clutch controller 84 carrying a rotatably mounted trunnion ring 85 operated by a clutch fork 86 controlled by a suitable lever or handle 87 (see Figs. 1,2, and 14) at the exterior of the casing 51. Similarly, the

clutches

82 and 83 are operated, through a clutch controller 88, by a clutch fork 89 connected with a lever or handle 90 similar to the lever 87. By operating the lever 87 to move the clutch controller 84 in one direction or the other from a neutral position in which the

clutches

80 and 81 are both released, the shaft 56 may be driven by either the gear 55 or the gear 7 2 while by similarly operating the lever 90 to move the clutch controller 88, said shaft may be driven through the gear 73, or may be held stationary by being clutched to the fixed member 75.

For adjustably supporting the cutter bar 29 from the casing 28 in such a manner as to permit said cutter bar to assume a variety of positions and to operate in a plurality of different planes, the following means are provided.

The casing 28 18 provided at its forward end with a cylindrical extension or hub 91 (see Figs. 3 and 14) on which is rotatably mounted a turret 92 formed with an arm or eccentric, plate-like extension 93. Secured. as by bolts 95, to the eccentric portion 93 of the turret 92, and'forming a part of said turret, is a casing 94 (see also Fig. 13) having a hub 96 on which is rotatably mounted a second turret 97, the axis of the hub 96, and consequently the axis of rotation of the turret 97, being offset with respect to the axis of the hub 91 and turret 92'but parallel thereto, as will be clear from the drawings. The turret 97 is in turn provided with a hub 98 having its axis transverse to the axis of the hub 96 but in the same plane therewith, on which hub 98 is rotatably mounted a third turret 99 carrying the cutter bar 29.

For actuating the cutter chain 30 and for controlling the movement of the turrets 92 97, and 99 about their several axes, the following mechanism is provided.

Journaled in the hub 91 is a sleeve 100 keyed or otherwise secured to the forward end of the motor shaft 50, said sleeve having formed thereon a pinion 101 which meshes with a gear 102 having an elongated hub 103 journaled in the hub 96 and coaxial therewith. Journaled in the hub 103 is a shaft 104 adapted to be connected with the gear 102 for rotation therewith by means of a suitable clutch 105 adapted to be shifted longitudinally of said shaft, to engage or disengage a clutch face thereon with a cooperating clutch face on the gear 102, by means of a clutch fork 106 (Figs. 1 and 2) operated by a suitable clutch controlling lever or handle 107. Carried by the forward end of the shaft 104 is a bevel pinion 108 meshing with a bevel gear 109 having a hub 110 journaled in the hub 98 coaxially therewith. Also rotatably mounted in the hub 98, and connected with the hub 110 for rotation therewith, is the hub 111 of the sprocket 112 for driving the cutter chain 30.

The hubs 110 and 111 are keyed to a sleeve 113 within which is rotatably mounted a shaft 114 arranged coaxially with the hub 98 and having fast upon its end a pinion 115 meshing with an idler gear 116 journaled upon a disk 117 secured, as by bolts 118, to the turret 99, said gear 116 meshing with a gear 119 fast upon a shaft 120 disposed substantially parallel to the shaft 114 and journaled in a suitable bearing in the turret 99. Fast upon the shaft 120 is a pinion 121 cooperating with a segmental rack 122 carried by the turret 97.

As will be seen from the foregoing, when the clutch 105 is thrown in to connect the gear 102 and shaft 104, rotation of the motor shaft 50 will be transmitted through the pinion 101, gear 102, shaft 104, and gears 108 and 109 to the sleeve 113 'and also to the cutter chain sprocket 112 to actuate the cutter chain. It will also be seen that by suitably connecting the sleeve 113 with the shaft 114 so as to cause rotationof said shaft in one direction or the other, motion will be transmitted through the pinion 115, gears 116 and 119. and shaft 120 to the pinion 121, causing the latter, by cooperation with the segmental rack 122, to swing the turret 99 and cutter bar 29 about the axis of the hub 98. For so,connecting the sleeve 113 and shaft 114 as to cause rotation of said shaft in either direct-ion and at different speeds, the following mechanism is provided.

The sleeve 113 is formed at one end with an eccentric portion 123 (see Figs. 3 and 5) upon which is rotatably mounted, as by rollers or other antifriction bearings 124', a ring 125 having formed thereon two spur gears 126 and 127. The gear 127 cooperates with a larger internal gear 128 having a hub ke ed or otherwise secured to the shaft 114, while the gear 126 cooperates with a second internal gear 129 formed on a sleeve 130'journaled in suitably formed bearings in the turret 97 and in a bracket 131 carried thereby. The ratio of the number of teeth on the gear 127 to the number of teeth on the gear 128 is different from the ratio of the number of teeth on the gear 126 to the number of teeth on the gear 129, so that the whole constitutes a compound epicyclic internal gear train of familiar form. Rotation of the eccentric 123 causes the gears 126 and 127 to travel about the interior of the gears 129 and 128, whereby, if the gear 129 be held stationary, the unequal ratios of the numbers of teeth on the gears of the several couples will cause the gear 128, and consequently the shaft 114, to be rotated at a reatly reduced speed with respect to the speed of rotation of the sleeve 113, and (if the parts be properly proportioned) in the opposite direction, and whereby, if the gears 128 and 129 be clutched together for rotation in unison, the unequal tooth ratios referred to will cause the gears to jam, so that the entire train, including the

gears

126, 127, 128, and 129, together with the shaft 114, will be caused to rotate in unison with the sleeve 113. Means are accordingly provided whereby the gear 129 may be held stationary or may be clutched to the gear 128, said means being of such a nature as to permit slipping of the parts under stresses in excess of a predetermined maximum in order to prevent injury to the machine, and, as herein shown, comprising a reversible friction device constructed and arranged as follows.

Referring to Figs. 3 and 4, the turret 97 is provided with an opening disposed in alinement with the shaft 114 and closed by a cap 132 secured to said turret, as by bolts 133, and having an inwardly extending annular flange 134, while the gear128 is formed with a similar annular flange disposed substantially in alinement with said flange 134. The sleeve 130 is adapted to be alternatively, clutched to the flange 134 or to the flange 135 by means of

friction disk clutches

136 and 137, respec tively. Said

clutches

136 and 137 are rendered alternatively operative by means of a clutch controller comprising a ring 138 interposed between said-clutches and connected by trunnions 139 with an annulus 140 rotatably mounted in an annular groove in a sleeve 141, said sleeve 141 being, for convenience in assembly, formed in two parts in threaded engagement with one another. As the parts are shown in Fig. 3, downward movement of the sleeve 141 and clutch controller 138 will render operative the clutch 137 to connect the gears 128 and 129, while upward movement of said sleeve and controller disengages the clutch 137 and renders operative the clutch 136 to connect the sleeve 1.30 with the flange 134, thereby holding the gear 129 stationary.

For operating the clutch controlling sleeve 1.41, there is provided a second sleeve or operating member 142 slidably mounted for longitudinal movement on a second annular flange 143 projecting inwardly from the cap 132 and held against rotation with respect to said cap by means of a pin 144 engaging a slot in said flange. For moving the sleeve or member 142 longitudinally, there is provided a, screw 145 journaled in the cap 132 and providcd exteriorly thereof with a hand wheel 146. The outer end of the sleeve 141 is intcriorly threaded to receive a bushing 147 whiclnwhen the parts are in neutral or normal position, with both

clutches

136 and 137 disengaged, registers with a nut 148 on the exteriorly threaded outer end of the sleeve 142. The sleeves 141 and 142 are provided, respectively, with internal and external shoulders 150 and 151, which, when the parts are in the normal or neutral position referred to, register with one another, as shown in Fig. 3. Engaging the bushing 147 and nut 148, is a washer 149, while engaging the shoulders 150 and 151, is a similar washer 152, and between these washers 149 and 152 is interposed a spring 153 located in a recess between the sleeves 141 and 142.

As will now be seen by referring to the parts as shown in Fig. 3, downward movement of the sleeve 142 by operation of the hand wheel 146 and screw 145 will be transmitted, through the nut 148, washer 149, spring 153, washer 152, and shoulder 150, to the sleeve 141, causing downward movement of said sleeve and of the clutch controlling ring 138, and thereby rendering operative the clutch 137 to connect the gears 128 and 129. Similarly, upward movement of the sleeve 142 will be transmitted through the shoulder 151, washer 152, spring 153, washer 149, and bushing 147, to the sleeve 141, causing upward movement of said sleeve and engagement of the clutch 136 to connect the gear 129 to the flange 134 so as to hold the gear 129 stationary. It will be seen that movement of the sleeve 142 in either direction is transmitted to the sleeve 141 through the spring 153, so that the power transmitted through

theclutches

136 and 137 is limited by the resistance of said spring to yielding under compression, which resistance may be regulated in accordance with requirements by subjecting said spring to a predetermined initial compresison through suitable adjustment of the bushing 147 and nut 148.

As will now be seen, by a proper adjustment of the hand wheel 146, rotation of the sleeve 113 may be transmitted, through the shaft 114 and intermediate connections, to the pinion 121, which by engagement with the rack 122 will cause the turret 99 and cutter bar 29 to be swung about the axis of the shaft 114 and hub 98, said swinging of the turret and cutter bar comprising a relatively slow movement in one direction, ora relatively rapid movement in the opposite direction.

As above explained, the cutter chain 30 is continuously actuated by the sprocket 112, and the setting of the bits in said chain is such, with respect to the operation of the cutter bar, that the relatively slow swinging movement of said bar constitutes the operative or cutting movement thereof, While the relatively rapid swinging movement of said bar in the opposite direction constitutes the idle or positioning movement of said bar.

Provision is made whereby the

turrets

92, 97, and 99 may all be locked against angular movement about their several axes of rotation, and whereby the mechanism above described for swinging the turret 99 and cutter bar 29 may also be employed for turning either the turret 92 or the turret 97 about its axis for the purpose of angular-l positioning said turrets in accordance with the requirements. To this end, the following means are provided.

The turret 99 is formed with a hooked flange or lip 154 (Figs. 1, 2, 3, and 6) which extends over a segmental portion 155 of the turret 97 adjacent the segmental rack 122. Said segmental portion 155 is formed with a series of openings 156 adapted to receive a locking pin 157 passed through an opening in the lip 154, whereby the turret 99 may be locked, against angular movement, to the turret 97 in any desired an ular position. The pin 157 is preferably ormed with a head 158 having a projection 159 adapted, in any position of the turret 99, to engage a segmental lip 'or flange 160 on the turret 97, whereby said pin may be retained in locking position against accidental dislodgment. As will be clear from Fig. 6, by giving the in a quarter turn, the projection 159 may be disengaged from the lip 160, thereby permitting removal of said pin.

The turret 97 is formed, adjacent the easing 94, with an annular flange 161 (Figs. 3 and 13) provided with a circular series of apertures 162 adapted to receive a pin or belt 163 engaging an opening in the casin 94, whereby the turret 97 can be locke against angular movement to the casing 94 in an desired adjusted angular position. For similarly locking the turret 92 tothe casing 28 in any adjusted angular position,

said turret is provided with an annular flange 164 (Figs. 3 and 14) having a circular series of openings 165 to receive a locking bolt or pin 166.

In order to turn the turret 97 about the axis of the hub 96, the

pins

157 and 166 are placed in looking position, the pin 163 removed, -and the hand wheel 146 operated to throw in the clutch 136, thereby rendering operative the transmission connections between the sleeve 113 and the pinion 121.

Inasmuch as the pin 157 looks the turret 99 against movement b the cooperative action of the pinion 121 an rack 122, the sleeve 113 will re-ac't through the gear 109 upon the gear 108, causing the former gear to travel about"- proper opening 162 to lock said turret in said position. In a similar manner, it will be seen that by insertin the locking pins 163 and 157 and removingtfie lockin pin 166, the reaction of the gear 109 may transmitted through the shaft 104 to the gear 102 to cause the latter to trigvel about the axis of thehpinion 101, there angularl positioning t e turret 92 about the axis of the hub 91. From the foregoing, it will be seen that the entire mechanism or cutter bar head shown in Fig. 3 may be turned to any desired angular position by turning the turret 92 about the axis of the hub 91, thatin any angular pgsition of the turret 92 the turret 97may turned to any angular position about the axis of the hub 96, and that 1n any angular position of either of the

turrets

92 or 97, the turret 99, with the cutter bar, can

.- be swung about the axis of the hub 98. These permissible adjustments make it possible to position the cutter bar to swing in substantially any desired plane; u

By reason of the angular ad ustab1l1ty of the turret92 with res t to the casing 28 and truck about the axis of the hub 91, and the angular adj ustability ofthe turret 97 with respect to the turret 92 about the axis of the hub 96, it .will be seen that the cutter bar 29 is capable of-assuming a wide variety of positions in order to swing and to cut kerfs in a wide varietyofplanes. Some of these positions are diagrammatically illustrated in Fig.- 18, whereinA denotes the axis of rotation of the turret 92, and B, B, B and B denote four positions, 90 apart, of the axis of rotation of the turret 97 as the 'turret 92 is rotated about the 'axisA. It will be seen that with the turret 92 so turned as to bring the axis of the turret 97 into position B,

the latter turret may be so turned about its axis as to bring the cutter bar 29 into either of the horizontal positions H or k, or into either of the vertical positions V or '0 Similarly, with the turret 92 turned to bring the axis of the turret 97 into the position B the latter turrret can be turned to bring the cutter bar into the horizontal positions H or h or into the vertical positions V or '0. In the same maner, with the axis of the turret 97 in the sition B, the cutter bar can occupy the orizontal positions H and k, or the vertical positions V and a; while with said axis in the position B, said cutter bar may occupy the horizontal sitious H or k, and the vertical positions 4 or '0. It will of course be understood that with the cutter bar in any of the positions indicated, said cutter bar may swing about the axis of the hub 98 in a plane perpendicular to said axis.

to cut a kerf in the mine face in that plane. It'will also be understood that, while four positions only of the axis of the turret 97 are illustrated in Fig. 18, the turret 92 may be turned to bring said axis into any intermediate position on the circle C, and that while certain horizontal and vertical positions of the cutter bar are indicated in said figure, the turret 97 may be turned upon its axis to bring said cutter bar into any intermediate inclined position tangent to a circle drawn about the axis of said turret as'a center, four such circles drawn with res ect to the positions 13, B, B, and B bein' indicated in Fig. 18 by the letters D D and D respectively. It will thus be seen that the cutter bar may be adjusted into substantially any position within the circle E (which is drawn tangent to and'encloses all of the circles D), and may be disposed at substantially any angle in any of said positions so as to cut a kerf in substantially any plane within the range of the machine.

A machine arranged as above described. is capable ofa wide variety of uses. For example, in the operation of entry driving, said vmachine may be used in accordance with the well known arcwa'll method illustrated in Fig. 15. In accordance with this method, the truck having been propelled into a suitable position in proximity to the face to be cut and brought into a stationary position therein, the hand wheel 146' is operated to throw in the clutch137 and cause the cutter bar 29 to be quickly swung into the dotted line position F. The clutch 137 is then released and the'cutter bar locked in this position by the pin 157, aft-er which the lever 87 is o erated'to throw in the clutch 81 and-cause the machine to be fed towardthe face at slow speed until the cutter bar is brought into the position shown in full lines in Fig. 13, thereby producin the sumping cut. The clutch 81 is thenre eased and the lever 90 operated to'engage the clutch 83 and lock the machine in stationary position. The pin 157 is then removed and the hand wheel 146 operated to engage the clutch 136, thereb causing the cutter bar to be swung slowly rom the position shown in full lines into the dotted line position G. Finally, the pin 157 is again inserted to lock the cutter bar (the clutch 136 having been released), and the lever 90 operated to engage the clutch 82, thereby causing the machine to be moved slowly rearwardl and bringing the cutter bar into the dotted line position K to complete the out.

It will be seen that in thus operating, the machine can be caused to insert, for-example, either horizontal kerfs, as illustrated in Figs. 15 and 17, or vertical kerfs, as illustrated in Fig. 19, and that these kerfs may be cutin substantially any desired plane within the range of the machine. Thus, for example, in cutting horizontal kerfs, said machine may be used for undercutting, as illustrated in Fig. 16, for top cutting, as illustrated in Fig. 17-, or for inserting a substantially horizontal kerf in any intermediate plane. It will also be seen that by a suitable adjustment of the hand wheel 43 the plane of the cutter bar may be adjusted about a transverse horizontal axis in order to cause the kerf to be out at a slight angle to the horizontal in the direction of travel of the machine, as indicated in Fig. 16.

In general, it will be seen that a machine has been provided wherein the cutter bar is capable of being adjusted into various positions about both transverse and longitudinal horizontal axes, and that said cutter bar is further adjustable toward and from said last named axis into substantially any desired position withinthe range of the machine.

In addition to operating in accordance with the 'arcwall method, as above described, the machine is also capable of use as a mounted longwall machine, as-diagrammatically illustrated in Figs. 20 and 21. When so operated, the controlling lever 87 may be adjusted to engage the clutch 80, causing the machine to be propelled at relatively high speed to the end of the face to be cut. Thereafter, the lever 87 may be operated to disengage the clutch 80, and the lever 90 operated to engage the clutch 83, thereby locking the truck in position on the track. The hand wheel 146 may then be operated to engage the clutch 136,

thereby causing the cutter bar 29 to be swung from the dotted to the full line position in Fig. 20, producing the sumping cut. The hand wheel 146 is then operated to release the clutch 136, the locking pin 157 inserted to lock the cutter bar in position, and. the lever 90 o erated to engage the clutch. 82, thereby causing the truck to move slowly rearwardly along the trackway and the cutter tar to cut the desired kerf in the face.

iihould ithe desired to out such a kerf in a plane maimed to the plane of the trackway, as in following a pitching seam, the bar 29 may be brought to the desired angle by a suitable adjustment of either the turret 92 or the turret 97 about its axis, as indicated in Fig. 21.

While several uses of the-machine have thus been indicated, these uses b no means exhaust its possibilities, since y reason of its wide adjustability, convenient and flexible control, high power, and sturdy construction, many other ways in which the same may be utilized to great advantage will be readily recognized by those skilled in the 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 seem a -by Letters Patent is:

1. In a mining machine, in combination, a swinging cutter bar, means for adjustably supporting the same, and common self-contained power operated mechanism selectively operative to swing said cutter bar or to adjust said supporting means to posit-ion said cutter bar said mechanism being rendered operative to perform either of said functions by presenting its performance of theother.

2. in a mining machine, in combination, a movable cutter, means for adjustably supporting the same, common self-contained power operated mechanism selectively operable to adjust said supporting means'to sition the cutter or to move said cutter to'perform the cutting operation, said mechanism being rendered operative to perform either of said functions b preventing its performance of the other, and devices for locking said cutter and said supporting means.

3. In a mining machine, in combination, a movable cutter, means for adjustablysupporting the same, or cunon self-contained mechanism alternatively operative on application of power thereto to move said supporting means to position said cutter in different planes or to move said cutter to perform the cutting operation, said mechanism including a yielding element and devices for positively locking either said cutter or said supporting means when the other is operated by said mechanism.

4. In a mining machine, in combination, a movable cutter, a rotatable turret by which said cutter is carried, and common self-contained mechanism operative on application of power thereto alternatively eiai'ier to rotate said turret or to move said cutter thereon.

5. In a mining machine, in combination, a movable cutting mechanism, a rotatable turrat by which said cutting mechanism is carried, and common self-contained means in cluding a train of mechanism operable on application of power thereto alternatively either to rotate said turret or to move said cutting mechanism thereon.

6. In a mining machine, in combination, a movable cutting mechanism, a rotatable turret by which said cutting mechanism is carried, and common self-contained means including a single train of mechanism constantly connected to said turret and to said movable cutting mechanism and operable on application of power thereto selectively to rotate the former or move the latter while the one not moved is stationary.

7. In a mining machine, in combination, a swinging cutter bar, a rotatable turret by which said cutter bar is carried, common selfcontained mechanism alternatively operative on application of power thereto either to rotate said turret or to swing said cutter bar thereon, and devices whereby said cutter bar and turret may be locked against movement.

8. In a mining machine, in combination, a rotatable turret, a swinging cutter bar mounted thereon, common self-contained mechanism alternatively operative on application of power thereto either to rotate said turret or to swing said cutter bar, and means for locking said cutter bar against swinging movement when said turret is rotated.

9. In a mining machine, in combination, a rotatable turret, a swinging cutter bar mounted thereon, means for locking said cutter bar to said turret, and common self-contained means for swinging said cutter bar when unlocked from said turret operative on ..pplication of power thereto to rotate said turret when said cutter bar is locked thereto.

10. In a mining machine, in combination, a rotatable turret having an arcuate series of apertures, a swinging cutter bar mounted on said turret for swinging movement relative thereto, a pin adapted to engage said apertures to lock said cutter bar to said turret against swinging movement, and common self-contained means for swinging said cutter bar operative on application of power thereto to rotate said turret when said cutter bar is locked.

11. In a minin machine, in combination, a rotatable turretiaving an arcuate series of apertures, a swinging cutter bar mounted on said turret for swinging movement relative thereto, a pin adapted to engage said apertures to lock said cutter bar to said turret against swingin movement, said pin having a. head provid with a locking projection and said turret having a flange adapted to overlie said projection. to retain said pin in lockin position, and means for swinging said cutter ar, said means being operative to rotate said turret when said pin is in position to lock said cutter bar.

12. In a mining machine, in combination, a. movable cutter, a rotatable turret by which said cutter is carried, common self-contained mechanism alternatively operative on application of power thereto to rotate said turret or to move said cutter thereon, and means to lock said turret when said cutter is moved.

13. In a mining machine, in combination, a rotatable turret, a swinging cutter bar mounted thereon, common self-contained mechanism alternatively operative either on application of force thereto to rotate said turret or to swing said cutter bar, and means for locking said turret against rotation when said cutter bar is swinging.

14. In a mining machine, in combination, a support havin a circular series of apertures, a turret rotatably mounted on said support, a cutter movably mounted on said turret, common self-contained mechanism alternatively operative on application of power thereto to rotate said turret or to move said cutter, and a pin adapted to engage said apertures to lock said turret when said cutter is moved.

15. In a mining machine, in combination, a rotatable turret, a swinging cutter bar mounted thereon, means for locking said cutter bar to said turret, means to lock said turret against rotation, and common self-contained means which is operative on application of force thereto both to swing said cutter bar when said turret is locked and to rotate said turret when said cutter bar is locked.

16. In a mining machine, the combination with a plane cutter, of means for supporting the same mounted for angular movement about a plurality of substantially horizontal parallel axes to each of which the plane of the cutter remains parallel during movement, said cutter being offset. from one of said axes, and a part of said supporting means being adapted to describe a. complete circle about one of said axes.

17. In a mining machine, the combination with a plane cutter, of means for supporting the same for bodily movement about a plurality of substantially horizontal parallel axes to each of which said supporting means maintains the plane of said cutter parallel at all times, said cutter being offset from one of said axes, and a part of said supporting means being adapted to describe a complete circle about one of said axes.

18. In a mining machine, the combination with a swinging plane cutter bar, of means for supporting the same for bodily movement about a plurality of substantially horizontal parallel axes to positions in angularly disposed planes each of which is parallel to each of said axes, said cutter being offset from said axes and one of said axes being movable to trace a. complete surface of revolution about the other.

19. In a mining machine, the combination with a cutter bar, of means for supporting the same mounted for angular movement about a plurality of substantially horizontal parallel axes,

axes, said cutter bar being offset from one of said axes and being mounted to swing about an axis transverse thereto to make an arcuate cut with the edge thereof, and a. part of said supporting means being adapted to describe a complete circle about one of said axes.

20. In a mining machine, the combination with a cutter bar, of means for supporting the same mounted for angular movement about a plurality of substantially horizontal, parallel axes, said cutter bar being ofiset from one of said axes and being mounted to swing about an axis transverse thereto, and a part of said supporting means being adapted to describe a complete circle about one of said axes, and means for driving said cutter bar including a shaft coaxial with one of said axes.

21.. In a mining machine, the combination with a cutter bar, of means for supporting the same mounted for angular movement about a plurality of substantially horizontal parallel axes, said cutter bar being ofiset from one of said axes and being mounted to swing about an axis transverse thereto, and a part of said supporting means being adapted to describe a complete circle about one of said axes, and means for driving said cutter bar including shafts coaxial with both of said parallel axes.

22. In a mining machine, the combination with a cutter bar, of means for supporting the same mounted for angular movement about a plurality of substantially horizontal parallel axes, said cutter bar being offset fromone of said axes and being mounted to swing about an axis transverse thereto, and a part of said supporting means being adapted to describe a complete circle about one of said axes, and means for driving said cutter bar including shafts coaxial with two of said axes.

23. In a mining machine, the combination with a cutter bar, of means for supporting the same mounted for angular movement about a plurality of substantially horizontal parallel axes, said cutter bar being offset from one of said axes and being mounted to swing about an axis transverse thereto, and a part of said supporting means being adapted to describe a complete circle about one of said and means for driving said cutter bar including shafts coaxial with all of said axes.

24. In a mining machine, the combination with a cutter and a driving motor, of means fdr supporting said cutter mounted for angular movement about a substantially horizontal axis, said cutter being offset from said axis, and said supporting means being adapted to describe a complete circle about said axis, means driven by said motor for moving said cutter bodily toward and from said horizontal axis, and means for adjusting said supporting means about a horizontal axis trans verse to said first named axis.

25. In a mining machine, the combination with a plurality of relatively movable supports, of a cutter movable on one of the same, and common self-contained power operated reaction mechanism whose elements variously cooperate to move said cutter relative to said last mentioned support and to rotate either of said supports when said cutter is held in a fixed position.

26. In a mining machine, the combination with a plurality of movable supports rotatable upon horizontal, laterally offset parallel axes and jointly rotatable upon one of the same through at least ninety degrees, of a cutter carried by one of said supports and movable relative-thereto about a third axis to cut a plane kerf parallel to said axis.

27. In a mining machine, the combination with a plurality of movable supports rotatable upon horizontal, laterally offset parallel axes and jointly rotatable upon one of the same through at least ninety degrees, of a cutter carried by one of said supports and movable relative thereto about a third axis, and power means including a power transmission shaft coaxial with one of said first mentioned axes for transmitting power to said cutter.

28. In a mining machine, the combination with a plurality of movable supports adjustable about laterally offset, parallel, substantially horizontal axes and jointly adjustable about one of the same, of a kerf cutter movably mounted on one of said supports, and common means for selectively adjusting either to cut a plane kerf parallel to said axes of said supports or moving said cutter while said supports remain stationary.

29. In a mining machine, the combination with a plurality of movable supports adjustable about laterally ofi'set axes and jointly movable about one of the same, of a cutter mounted on one of said supports and movable relative thereto, and common self-com tained power operated means for selectively moving said cutter or adjusting either of said supports.

30. In a mining machine, the combination with a support rotatable on a horizontal axis. of a cutter bar carried by said support and movable relative thereto about an axis at right angles to the axis thereof, a motor, and

a single self-contained means selectively operable by power from said motor either to move said cutter or to rotate said support.

31. In a mining machine, the combination with a movable cutter, of supporting means therefor adapted to permit angular adjustment thereof bodily about a plurality of parallel axes, and common self-contained mechanism whose same elements are alternatively operative on application of power thereto to move said supporting means to position said cutter or to move said cutter to perform the cutting operation.

32. In a mining machine, the combination with a plane kerf cutter having cutting elements movable along its length adapted to cut a plane kerf to admit said cutter, of supporting means therefor adapted to permit angular adjustment thereof about a plurality of parallel horizontal axes, said cutter being offset from said axes, and said supporting means being adapted to describe a complete circle about either of said axes to change the plane of cut.

33. In a mining machine, the combination with a machine frame and a swinging cutter bar having cutting elements movable along its length adapted to cut a plane kerf to admit said bar, of supporting means for said bar adapted to permit angular adjustment thereof about a plurality of parallel axes disposed longitudinally of said machine frame, said cutter bar being mounted on said supporting means to swing about an axis transverse to said first named axes.

34. In a mining machine, the combination with a cutter having cutting elements movable along its length adapted to cut a plane kerf to admit said bar, of supporting means therefor comprising a turret rotatable on a substantially horizontal axis, and a second turret mounted on said first named turret for angular movement about an axis eccentric to but parallel with the axis of said first named turret, said cutter being movable about an axis perpendicular to the axis of one" of said turrets to cut a plane kerf in the working face.

35. In a mining machine, the combination with a movable cutter, of su porting means therefor comprising a rotate le turret and a second turret mounted on said first named turret for angular movement about an axis eccentric to the axis of said first named turret, and mechanism whose same elements are selectively operative to rotate either of said turrets or to move said cutter thereon.

36. In a mining machine, the combination with a swinging cutter bar having cutting elements movable along its length adapted to cut a plane kerf to admit said bar, of supporting means therefor comprising a turret rotatable on a substantially horizontal axis and a second turret mounted on said first named turret for angular movement about an axis eccentric and parallel to the axis of said first named turret, said cutter bar being mounted on said second turret to swing about an axis transverse to said first named axes.

37. In a mining machine, the combination with a pivoted cutter, of supporting means therefor comprising a turret, a second turret mounted directly on said first named turret for angular movement about an axis offset from but parallel to the axis of said first named turret, said cutter being mounted on said second turret for swinging movement relative thereto, and driving connections including members arranged concentric with the axes of both of said turrets for operating said cutter.

38. In a mining machine, in combination, a turret rotatable on a horizontal axis, a second turret mounted thereon and havin the axis thereof parallel to the axis of sai first mentioned turret, a third turret mounted on said second turret, and a cutter carried by said third turret and means for operating said cutter including a power transmission shaft extending along the axis of rotation of said second mentioned turret.

39. In a mining machine, in combination, a turret, a second turret mounted thereon, a third turret mounted on said second turret, a cutter bar carried by said third turret, means for locking all of said turrets, and mechanism automatically operative to rotate any one of said turrets when the rotated turret is unlocked and the other turrets locked.

40. In a mining machine, in combination, a turret, a second turret mounted on said first named turret for angular movement about an axis eccentric and parallel to the axis of said first named turret, a third turret mounted on said second turret, a cutter carried by said third turret, and driving connections including members arran ed concentric with the axes of said turrets or operating said cutter.

41. In a mining machine, in combination, a turret, a second turret mounted thereon, a third turret mounted on said second turret and having the axis thereof so disposed relative to the axis of said first mentioned turret that said axes maybe arranged erpendicular, a cutter bar carried by said t hird turret, a cutter chain carried by said cutter bar, and driving connections for said cutter chain including members arranged concentric with the axes of all of said turrets.

42. In a mining machine, in combination, a turret rotatably mounted on a horizontal axis, a second turret mounted thereon and havin the axis thereof parallel to the axis of sai first mentioned turret, a third turret mounted on said second turret, a cutter carried by said third turret, and driving connections for actuating said cutter including reduction gearin connections for angularly moving said third turret.

43. In a mining machine, in combination, a turret, a second turret mounted thereon, a third turret mounted on said second turret, a cutter bar carried by said third turret, a cutter chain carried by said cutter bar, and power driven mechanism for actuatin'g said cutter chain and for angularly moving said third turret including members arranged concentric with the axes of all of said turrets and reduction gearing for operating the turret moving means.

44. In a mining machine, in combination, a turret, a second turret mounted thereon, a third turret mounted on said second turret, a cutter carried by said third turret, and drivment thereof as a wb ing connections for actuating said cutter including a compound epicyclic gear train and connections for angularly moving said third turret.

4.5. In a mining machine, in combination, a turret, a second turret mounted thereon, a third turret mounted on said second turret, a cutter carried by said third turret, and yieldin driving connections extending through said first and second turrets for operating said third turret.

46. In a minin machine, in combination, an angularly ad ustable support, a turret mounted thereon for angular movement about an axis transverse to the axis of movement of said support, a second turret mounted on said first named turret for angular movement about an axis eccentric and parallel to the axis of said first named turret, a third turret mounted movement about an axis transverse to the axes of said first and second turrets, and a cutter carried by said third turret.

47. In a mining machine, the combination with a cutter having cutting elements movable alon its len h adapted to cut a plane kerf to a 't sai bar, of supporting means therefor adapted to permit angular move- 0 e about a plurality of parallel axes to change the plane of cut, and means for adjusting said supporting means about an axis transverse to said first named axes.

48. In a mining machine, the combination with a prime mover and cutting means comprising a cutter, means for supporting said cutter ermitting angular adjustment thereof sai cutter bein adapted to cut in planes substantially aral e1 to the axis of said adjustment and Being adjustable by saidprime mover toward and from said axis, of a truck for supportin said cuttin means comprising a body an a lurality o axles, and means for ad'usting said body with res t to one of sad axles about the axis of t e other of said axles to vary the position of the axis of adjustment of said cutter suplportin means.

49. In a mining machine, t e coin ination with a motor and cutting means comprising a cutter, means for supporting the same mount! ed for angular movement, said cutter being offset from the axis of movement of said suporting means and adjustable toward and horn said axis by said motor, and said supporting means being ada ted to describe a complete circle about sai axis, of a truck for supportin said cutting means, said truck comprising a dy and a pluralit of axles, and means for adjusting said y with respect to one of sai axles about the axis of the other of said axles to vary the angular position of the axis of said cutter supporting means.

50. In a mining machine, the combination with cutting means comprising a cutter and on said second turret for angular means therefor adapted to rmit angular a 'ustment thereof bodil a ut a plurality 0 parallel axes, of a true for supporting said cutting means, said truck comprising a body and a plurality ofaxles, and means for ad ustin' said body with respect to one of said axles a ut the axis of the other of said axles to vary the angular position of the axes of said cutter supporting means.

' 51. In a. mining machine, the combination with a truck, of cutting mechanism thereon including a motor, and transmission and braking mechanism including a plurality of pairs of friction clutches between said motor and truck adjustable to cause said truck to be support' driven in either direction and at a plurality of speeds or to be held stationary:

52. In a mining machine, the combination with a truck, of cutting mechanism thereon including a motor, and transmission and braki mechanism between said motor and truck including a plurality of pairs of friction clutches and a plurality of sets of worm gearing driving certain o the same, said mechanism being adjustable to cause said truck to be driven in either direction at a plurality of speeds or to be held stationary.

53. Ina mining machine, the combination with a truck, of cutting mechanism thereon including'a motor, a motor shaft, a drivin shaft, means operated by said driving sha t for propelling said truc alternatively operative sets of worm gearing for operatively connecting said shafts.

54. In a mining machine, the combination with a truck, of cutting mechanism thereon including a motor, a motor shaft, a truck driving shaft, means operated by said driving shaft for propelling said truck, spur gears driven by said motor shaft, a plurality of sets of worm aring driven by said spur gears, and clutc es between said worm gearing and said truck driving shaft.

55. In a mining machine, the combination with a truck, of cuttingmechanism thereon including a motor, a motor shaft, a drivin I shaft, means operated by said driving shaf for prospelling said truck, a worm on said motor aft, a worm gear loosely mounted on said driving shaft and cooperating with said worm, a plurality ofworms dis madwith their axes parallel to' the axis 0 said first named worm and operatively connected with said motor shaft for rotation thereby, worm gears loosely mountel on said driving shaft and cooperating with said last named worms respectively, and means for selectively connecting any of said worm gears 'to said drivi shaft to rotate the same.

56. a mining machine, the combination with a truck, of cutting mechanism thereon includinga motor, a motorshaft, a drivin shaft, means operated b said driving sha for propelling said true at a cutting speed, a casing, and means in said casing for operand a plurality of' atively connecting said motor and driving shaft to actuate the latter or for connecting said driving shaft to said casing to hold the same against movement.

57. In a mining machine, the combination with a truck, of cutting mechanism thereon including a motor, a motor shaft, a driving shaft, means operated by said driving shaft for propelling said truck, a casing, a plurality of sets of worm gearing in said casing for operatively connecting said motor and driving shafts, and means for selectively rendering operative any of said sets to actuate said driving shaft or 'for connecting said driving shaft to said casing to hold the same against movement.

58. In a mining machine, the combination with a truck and cutting means thereon, of a truck driving shaft, a plurality of friction clutches connectable to said shaft, worm gearing operatively connected to an element of each clutch, a power driven driving member, and gearing reversely driven thereby driving said worm gearing.

59. In a mining machine, the combination with a truck and cutting means thereon, of a power driven driving element, a truck drivmg shaft, a plurality of clutch mechanisms controlling tbe connection of said shaft, and combined spur and worm gearing, said spur gearing being driven by said driving element and sa1d worm gearing being driven by said spur gearing and driving the rotatable elements of said clutches.

60. In a mining machine, the combination with a truck and cutting means thereon, of a truck driving shaft, a power operated driving member, operative connections between the latter and said shaft including a plurality of clutches adjustable to cause said truc driving shaft tobe driven in either direction and at 'a plurality of speeds or to be held stationary, a winding drum carried on said shaft, and a flexible member wound on said drum;

61.. In a mining machine, a cutter mecha-,

nism comprising a swinging cutter bar, a support rotatable through at least ninety degrees about a horizontal axis perpendicular to the working face, and a mountin on said support for said cutter bar upon w ich said cutter bar is adjustable tocut u on swinging movement thereof a series 0 intersecting kerfs whose envelope is asurface of revolution having an axis parallel to said horizontal axis but ofi'set therefrom, without movement of said support upon adjustment of said cutter bar mounting into any of its difierent operatingpositions.

62. In a mining machine, a main support adjustable throu h at least ninety degrees about a horizon axis, a second su port adjustableabout a second axis at a fix distance from said first axis, and a swinging cutter bar mounted on said second support, said second support being adjustable on said first support whereb said bar may swing in the same plane aralle to said horizontal axis when said t support is in different adjusted positions relative to said horizontal axis.

63. In a mining machine, a cutter comprising orbitally moving cutting means, and a mounting for said cutter comprising a member rotatable about an axis at all times parallel to the plane of said orbit and a second member mounted on said first mentioned member and rotatable with respect thereto, said second member comprising a pivotal support for said cutter and sing operative upon rotation to bring said cutter into a series of planes in each of which the plane of said orbit shall be tagent to the same surface-of revolution.

64. In a mining machine, a cutter mechanism comprising cutting means traversing a plane orbit, a mounting. for said cutter comprising a member rotatable about an axis at all times parallel to the plane of said orbit, and means mounted on said member for supporting said cutter mechanism and relative to which said cutter mechanism is swingable to make a cut, said means being ad'ustable relative to said member so that sai cutter mechanism may cut, without movement of said member, a series of kerfs whose traces on a plane transverse to said axis will lie along angularly dis osed chords of the circle cut on said plane by the surface of revolution generated upon rotationof said cutter mechanism about said axis.

65. In a mining machine, the combination with a base movable toward and from the work during cutting, a. lane kerf cutter, and means for supporting t e same on said base including means mounted for angular ad- 'ustment about a. plurality of substantially orizontal parallel axes extendin longitudinally of said base, said cutter oing ofis'et from one of said axes and a part of said supporting means being adapted to describe a complete circle about one of said axes.

66. In a mining machine, in combination with a base movable toward and from a working face during cutting and a cutter bar, of means for supporting the cutter bar on the base including means mounted for angular movement about a plurality of substantially horizontal axes which are parallel to the direction of movement of the base toward and from the face, said cutter bar being offset from one of said axes and being mounted to swing about an axis transverse thereto and a art of said supporting means being adaptto describe a complete circle about one of said axes.

67. In a mining machine, a cutter mechanism comprising a swingingcutter bar, a support rotatable through at least ninety degrees about a horizontal axis perpendicular to the working face, and a mounti on said support for sand cutter bar upon'w ich said bar is adjustable to out upon a swinging movement thereof a series of intersecting kerfs whose envelope is a surface of revolution having an axis ofiset from but parallel l to said horizontal axis, without movement of said support.

68. In a mining apparatus, a machine frame movable durlng cutting, a neck rotab able on said frame upon a horizontal axis, a

support carried by said neck and notatable on the latter upon an axis spaced from and bodily rotatable about said first mentioned axis, and a plane cutter bar pivotally mounted on said support, the plane of said bar being ll always parallel to both of said axes in all positions of adjustment of said elements.

69. In a mining apparatus, a machine frame movable during cutting, a neck rotatable on said frame upon a horizontal axis, a plane cut- U ter bar, and means on which said bar is mounted pivotally connected to said neck, rotation of said neck and of said bar supporting means on their respective axes being operative to position said bar in any horizontal plane between the roof and a plane adjacent the bottom of the mine and without longitudinal movement of the bar.

70. In a mining machine, in combination, a base movable towards and from a working 343 face during cutting, a plane cutter bar, a

motor on said base, and means for adj ustably supporting said bar so that it may insert -kerfs in a multiplicity of horizontal planes within the cutting limits of the machine including a pivotal support rotatable on a horizontal axis midway between the vertical cut ting limits of the machine, and a second support carrying said bar and pivotable on a parallel axis carried bv said first mentioned support but offset from said first mentioned axis, said bar being spaced on said second mentioned support a substantial distance from said second mentioned axis.

71. In a mining machine, in combination, a base movable towards and from a working face during cutting, a plane cutter bar, a motor on said base, and means for adjustably supporting said bar so that it may insert kerfs in a multiplicity of horizontal planes within the cutting limits of the machine including a pivotal support rotatable on a horizontal axis midway between the vertical cutting limits of the machine, and a second support cariying said bar and pivotable on a par- 7 kerfs in a multiplicity of horizontal planes within the cutting limits of the machine including a pivotal su port rotatable on a horizontal axis midway between the vertical cutting limits of the machine, and a second support carrying said bar and ivotable on a parallel axis carried by said rst mentioned support but offset from said first mentioned axis, said bar being spaced on said second mentioned support-a greater distance from said second mentioned axis than the distance between said axes.

73. In a mining machine, in combination, a base movable towards and from a working face during cutting, a plane cutter bar, a motor on said base, and means for adjustably supporting said bar so that it may insert kerfs in a multiplicity of vertical planes within the lateral cutting limits of the machine includ ing a pivotal support rotatable on a horizontal axis midway between the sides of the machine, and a second support carrying said bar and pivotable on a parallel axis carried by said first mentioned support but offset from said first mentioned axis, said bar being spaced on said second mentioned support a substantial distance from said second mentioned axis.

74. In a mining machine, in combination, a base movable towards and from a working face during cutting, a plane cutter bar, a motor on said base, and means for adjustably supporting said bar so that it may insert kerfs in a multiplicity of vertical planes within the lateral cutting limits of the machine including a pivotal support rotatable on a horizontal axis midway between the sides of the machine, and a second support carrying said bar and pivotable on a parallel axis carried by said first mentioned support but offset from said first mentioned axis, said bar being spaced on said second mentioned support a distance from said secondmentioned axis different from the distance between said axes.

75. In a mining machine, in combination, a base movable towards and from a working face during cutting, a plane cutter bar, a motor on said base, and means for adjustably supporting said bar so that it may insert kerfs in a multiplicity of vertical planes within the lateral cutting limits of the machine including a pivotal support rotatable on a horizontal axis midway between the sides of the machine, and a second support carrying said bar and pivotable on a parallel axis carried by said first mentioned support but offset from said first mentioned axis, said bar being spaced on said second mentioned support a greater distance from said second mentioned axis than the distance betweensaid axes.

76. In a mining machine, a wheeled base, a support mounted on and movable with respect to said base, a second support carried by said first mentioned support and movable relative thereto, a cutting mechanism carried