US2065945A

US2065945A - Mining machine

Info

Publication number: US2065945A
Application number: US708814A
Authority: US
Inventors: Nils D Levin
Original assignee: Jeffrey Manufacturing Co
Current assignee: Jeffrey Manufacturing Co
Priority date: 1934-01-29
Filing date: 1934-01-29
Publication date: 1936-12-29
Anticipated expiration: 1953-12-29

Description

Dec. 29, 1936. LEvlN 2,065,945

MINING MACHINE Filed Jan. 29, '1934 5 Sheets-Sheet 1 N. D. LEVIN 2,065,945

MINING MACHINE Filed Jan. 29, 1934 5 SheetsSheet 2 N. D. LEVIN MINING MACHINE,

Filed Jan. 29, 1954 5 Sheets-Sheet 3 [N VENTOR N/LJ D. LEW/v ATT'Y Dc. 29, 1936. LEV|N MINING MACHINE Filed Jan. 29, 1934 5 Sheets-Sheet 4 vE/v TOR. M45 D. LEW/v.

BY 6am, M

A TT'Y Dec. 29, 1936. N. D. LEVIN 2,065,945

' MINING MACHINE Filed Jan. 29, 1934 s Sheets-Sheet 5 h z\ o. 126 141 R8 140 I06 l2? \25 y /NVEN7 OF\ us 12 HQ 120 /V/L5 D. LEV/IV, W14 5y ATT'X Patented Dec. 29, 1936 UNlTED STATES PATENT OFFICE lWINING MACHINE Nils D. Levin, Columbus, Ohio, assignor to The J efirey Manufacturing Company, a corporation of Ohio 31 Claims.

The present invention relates to mining machines of the type adapted to the mining of coal, although it should be understood that it may have a general application.

One of the objects of the invention is to provide a mining machine equipped with an elongated cutter bar which is mounted in a head adapted to quickly revolve so as to position the cutter bar in different planes.

A further object of the invention is to provide improved and efficient power transmitting mechanism for effecting a turnover of the cutter head.

More particularly, the object of the invention is to provide in a mining machine turn-over head mechanism for a kerf-cutter in combination with mechanism for adjusting the elevation of the kerf-cutter in order to increase the range of cutting between the floor and roof of the mine entry or room and so that horizontal kerf-cutting may 20 be effected at the floor and at the roof and intermediate the floor and roof in mine Veins of various heights.

The invention is exemplified in the combination and arrangement of parts shown in the accompanying drawings, and described in the following specification, and it is more particularly pointed out in the appended claims;

In the accompanying drawings, Fig. 1 is a plan view of a track mounted mining machine em- 30 bodying the present invention;

Fig. 2 is an elevational view of the track mounted mining machine shown in Fig. 1;

Fig. 3 is a sectional elevation taken along the plane of the line 33 of Fig. 1;

Fig. 4 is a fragmentary sectional view showing details of locking mechanism for securing the cutter head in desired position, the view being taken on the line 4-4 of Fig. 5, looking in the direction of the arrows;

Fig. 5 is a fragmentary plan view of the turnover head and its mounting, parts being broken away to show certain details of the drive mech; anism;

Fig. 6 is a sectional view taken on the line 6-5 of Fig. 5, looking in the direction of the arrows;

Fig. '7 is a sectional view taken on the line T? of Fig. 5, looking in the direction of the arrows;

Fig. 8 is an enlarged sectional elevation of a portion of the machine shown in Fig. 1, and taken on the line 88 thereof;

Fig. 9 is an enlarged sectional elevation onth'e line 99 of Fig. 10; I

Fig. 10 is a diagrammatic plan view showing the relative positions of the parts of the turntable shown in Fig. 1;

Fig. 11 is an enlarged sectional elevation of the connections to the machine for swinging the turntable at a feeding speed; 5

Fig. 12 is an enlarged sectional elevation of the pawl and ratchet mechanism for effecting reversa'l of the swinging feeding movement of the turntable and kerf-cutting mechanism;

Fig. 13 is an e-levational' View showing brake 1'0 mechanism associated with the shaft and the worm which constitutes part of the swinging feeding mechanism for the kerf-cutter;

Fig. 14 is a sectional elevation showing part of the structure illustrated in Fig. 12; and

Fig. 15 is a sectional elevation taken on the line Iii-I5 of Fig. 12.

Referring more particularly to the drawings, and especially to Figs. 1 and 2, it will be seen that the supporting frame It is mounted on wheels 16a, lfia, which are adapted to travel on the mine track lib. Mounted on the frame 16 is a supporting ring 11 around which is distributed a series of supporting rollers [8, I8. The ring I! is mounted for adjustment on three 1115- right standards l9, [9 at the front end of the frame H5 and on the rear central standard 190. at the central portion of the frame [6, as shown in Fig. l. The ring I1 may be adjusted in elevation and inclination by means of such structure as that shown in the Levin Re issue Patent No. 17,603, granted Feb. 25, 1930, for an Improvement in mining machines. The adjustments in elevation and inclination may be effected by power-operated mechanism controlled by clutches individual to each standard as illustrated in Levin Patent No. 1,353,054, granted September 14, 1920, for an Improvement in mining machines, or the adjustments referred to herein may be made in accordance with Levin Patent No. 1,904,489, granted April 18, 1933. It should be understood that after the ring 11 has been adjusted in elevation and inclination it remains in fixed relation to the supporting frame 16 during the operation of the kerf-cutting mechanism.

Mounted on the ring I! so as to partake ofthe adjustments thereof in elevation and inclination; is a turntable 20. As shown in Fig. 3, a peripheral flange 2! supports the turntable 20 on the rollers 18. By means of an electric motor 22 connected to mechanism asillustrated in Figs. 8 to 15 inclusive, the turntable 20 may be rotat ed relatively to the supporting ring I! and about the center thereof.

electric motors

22 and 23 which are independently operated and controlled.

Fixed rigidly to the'turntable 20 and extending radially therefrom is a supporting arm 21 to which is connected a bracket 20, carrying the cutter head 29 to which is secured the elongated cutter bar 30 having an endless chain cutter guided around the periphery thereof. A driving sprocket 32 meshes with this chain and is secured by keys 3| to the lower end of a torque shaft 33 on the upper end of which is mounted a bevel gear 34. A clutch 35 is mounted on the shaft 33 for controlling operation of the sprocket 32, the clutch being operated in turn by a rock shaft 36 and lever 31. A plate 38 secured by screws 39 to the cutter head 29 serves as a guide for the chain I46 during operation of the sprocket.

As shown in Fig. 3, the armature shaft v40 which projects from the motor 22 in'Fig. 1 has secured thereto a bevel pinion M which meshes with a horizontal bevel gear 42 secured to the vertical shaft 43. v'Ihe'upper end of shaft 43 is provided with a bevel gear 44 which meshes with the bevel gear 45' mounted on one end of shaft 46, the other end of the shaft carrying the bevel gear 41 which meshes with the bevel gear 34 on shaft 33, the sprocket 32 being thereby actuated responsively to operation of the clutch 35.

' Before proceeding with further details of the driving mechanism for the cutter chain and the turnover head mechanism there will be described the mechanismior feeding the chain kerf-cutter on the center of the turntable; which mechanism may be understood by referring to Figs. 8 to 15 inclusive. This mechanism is substantially the same as that disclosed and claimed in my application Serial No. 656,697 filed February 14,

The ring I1 has secured to its'inner edge an annular rack 98 with which meshes a pinion 99 Fig. 8 at the lower end of a vertical shaft I00, mounted in a bearing I000, on the turntable 20.

' Keyed to the upper end of the shaft I00.is a spur gear IOI which meshes with a spur gear I02. By

. means of a friction disc'clutch I03 operated by shaft I06.

the sprocket I04, the gear I02 may be connected through the rotating element I05 to the vertical To the lower end of the shaft I06 is keyed a worm gear I01 with which meshes a worm I08 which is arranged to be operated in one direction or the other by means of the pawl and ratchet mechanism shown in Figs. 10, 11, 12

and 14. a

Asshown in Fig. 9. a manual wheel I09 is mounted on a shaft IIO, on the'opposite end of which is mounted a bevel gear II I meshing with a bevel gear I I2 mounted for rotation on'a vertical, axis and with the sprockets H3 and I04,

chain. I I4 connecting the two sprockets. Therefore, by rotating the wheel I 09 in one direction or a the other the friction clutch I03 may be applied or released to effectpower transmitting connection between the worm 108 and the annular rack 98. V 7

' As shown in Fig. 11, the lower end of shaft 43 is provided with an eccentric cam II5 on the periphery of which is mounted the eccentric of the arm H8 is a bifurcated support I20 carrying the bearing pin I2I, as'shown in Figs. 11

and 12.

J ournaled on the pin I2I and on the shaft I00 are supporting members I22 and I23, and be tween these members on the pin I2I are reversely arranged pawls I24 and I25. Reversely arranged ratchets I 26, I21 are keyed to the shaft I08 to rotate with the latter. A pawl setting device I28 is provided with openings I28 I28 in position to permit pawl I24 or the other pawl I25 to engage its respective ratchet wheel I26 or I21.

By means of the lever I29, the shaft I30 may be rocked in one direction or'the other to operate the spur gearing I3I, I32, to bring either the opening I28 or the opening I28 into position to permit one pawl I24 or the other pawl I25 to engage its ratchet wheel. A spring pressedpin I33 fits into one of the recesses I34 to hold the pawl setting device I28 in adjusted position.

At the right-hand end of the shaft I08 as shown in Fig. 12 is secured a brake wheel I35 with which is associated a brake band I36 which is held yieldingly applied to the brake wheel I35 by means of the springs I31, I31. During swinging feeding movement of the kerf-cutter into the mine vein, vibrations may cause partial reversal" of the worm I08, while the pawl I24 or the, pawl I25 is moving from one notch to the next notch.

To overcome this tendency of the worm I08 to 7 partially reverse its rotation, the brake mechanism shown at the right-hand end of the shaft I08 is relied on to hold the worm I08 in the position to which it had been moved by the pawl and ratchet mechanism.

To facilitate assembly or removal of the pawl and ratchet mechanism for replacement of parts,

the bracket I38 for supporting the shaft-I30 may be removably secured by means of cap screws I39 to the turntable 20. The bracket I38 may fit into the trough I40. so as to hold in place the sections I4I, I4I of the bearing for the righthand portion of the shaft I08 I Spaced at intervals around the peripheral portion of the turntable 20 on the underside thereof are brackets I42 in which are mounted fixed vertical bearings I43 for rollers I44 within the rings I45 which are adapted to roll around the inner surface of the ring I1 as shown in Fig. 9. Lateral thrust on the turntable will therefore be taken by the roller bearings I43; I44, I45 to relieve the strain between the pinion 99 and the annular rack 98.

It will thus be seen that during swinging feeding movement, the cutter bar 30 is rigidly connectedjusted position at an acute angle relative to the mine track. During driving of the chain cutter by means of the motor 22 and the power transmission mechanism between this motor, and the chain cutter,the drum I28,Fig. 14, may be 1o-.

cated in neutral position to hold both of the ratchet pawls I24'and I25out of engagement with their respective ratchets.

While the cutter bar is located at an acute angle relative to the mine track, the kerf cutter may be sumped into the coal face extending across the space in advance of the mine track, by traction feed. which is effected by the motor 23 operating truck propelling mechanism through the reduction gearing located at 24. After the sumping out has been completed and an arcuate feeding movement effected across the working face, the traction feeding mechanism may again be operated to effect a rectilinear withdrawal movement parallel to the mine track, thereby completing the cutting of a parallel ribbed kerf. In this manner parallel ribbed kerfs may be cut in relatively narrow entries or in relatively wide entries, the depth of each cut being equal to the full effective length of the cutter bar.

When arcuate feeding is effected across the working face inv advance of the mine track it is desirable that the cutter bits on the advance side of the cutter bar shall continuously emerge from the coal face so as to sweep the cuttings therefrom. It is also desirable to reduce the overall height of the mining machine shown in Fig. 2 so that it may operate in relatively low roof mine chambers or rooms, and so that it may be transported along mine entries having low roofs. By reason of the elevating screw mechanism located at l9, l9, l9a, the same machine may also be used in operating in relatively high planes and by use of the turnover mechanism hereinafter described the kerf cutter may be located in relatively high planes above all other parts of the machine. When the cutter bar is inverted, however, the arcuate feeding of the cutter bar should be reversed so that the cutter bits will again be on the advance side of the cutter bar. For, instance, if the arcuate feed as viewed in Fig. 1, is anticlockwise when the cutter bar is in its lower position as shown in Fig. 2, the arcuate feed should be clockwise after the cutter bar has been inverted so as to occupy a top cutting position. It will thus be seen that whether the cutter bar is fed arcuately in a clockwise direction in one plane or fed in an anti-clockwise direction in another plane, the cutter chain way always be kept moving in the same direction and so as to emerge from the coal face on the advance side of the cutter bar to effect sweeping of the coal cuttings from the coal face. The motor 22 may be continuously operated in the same direction since the cutter chain always travels in the same direction, the reversal of arcuate feed being effected by the reverse feeding mechanism illustrated in Figs. 11, 12 and 14.

It should also be noted that the elevating mechanism located at l9, I9 9a, is individually operable as shown in the patents above referred to. The inclination relative to the horizontal of the kerf cutter comprising the cutter bar 30, may be ad justed since such cutter bar always remains in a plane at right angles to the axisof rotation of the turntable 29.

The details of the turnover mechanism for rotarily adjusting the plane of the cutter bar on the horizontal axis of the shaft 46 are illustrated in Figs. 3 to '7, inclusive. By referring to these views, it will be seen that the cutter head mechanism including the cutter head 29, the driving sprocket 32, the clutch 35, and the shaft 33, is

enclosed in a housing 48 which is provided at its rear end with a tubular extension or neck 49' supported for rotation on the bearing comprising the bushing 59. At the rear end of the neck 49 apparatus is provided for rotarily adjusting the cutter bar from a relatively low horizontal plane to a relatively high horizontal plane, the latter plane extending above all other parts of the machine in a top cutting position.

By referring to Fig. it will be seen that there is keyed to the hub 41* of the beveled gear 41, a spur gear 5| which meshes with a gear 52 keyed to the front end of a shaft 53 journaledinthehousing 58. At the rear end of the shaft 53 is a pinion 54 (Fig. 6) which meshes with an internal or annular gear 55 integral with the drum 55. The drum 55 as shown in Fig. 3 is journaled on the rotary neck 49 which extends rearwardly from the housing 48. A ring plate 49 fits against an annular shoulder of the neck 49 and at its periphery fits an annular recess in the peripheral portion of the drum 55 to complete the enclosure of the gears 54 and 55 It will thus be seen that when the motor 22 drives the horizontal shaft 46, power is transmitted through the spur gears 5|, 52 to the shaft 53 and thence to the gears 54 and 55 to effect rapid rotation of the drum 55. Consequently, whenever the motor 22 is operating the drum 55 is being rotated, so long as the neck 49 is stationary relative to the radial support 59.

In order to effect rotation of the neck 49 and the elongated chain kerf cutter, on the horizontal axis of the shaft 46, friction mechanism in the form of a brake is provided to produce a friction clutch between the gear 55 and the neck 49. The brake mechanism is illustrated in Fig. 6 and is mounted on the bracket 65' which is rigidly connected to the stationary ring 65, the latter being detachably secured by means of the bolts 61- to the flange 64' integral with the radial support 59' and extending in. a plane at right angles to the shaft 45'.

The brake-mechanism illustrated in Fig. 6 comprises a pair of shoes or

brake bands

56, 56, which are adjustably connected at their ends remote from the bracket 65" as illustrated at 51. The brake shoes may be applied to the drum 55 by raising the lever 59 which is connected by the link 58 to the bracket 65" at 58'. It should be understood that the right hand end of the lower section of the brake as viewed in Fig. 6 is rigidly secured to the bracket 65". It will thus be seen that when the lever 59 is moved up the brake shoes 56-, 56 are brought into closer contact with the drum 55 so as to apply the brake, and when the lever 59 is released the spring 59' will effect automatic release of the brake mechanism.

As shown in Fig. 3 an annular groove 60 at the rear portion of the neck 49 is adapted to receive a split retaining ring 6|. At the rear end of the neck 49 is located an annular collar 62 which is keyed to the neck 49 by a plurality of keys as shown at 63 in Fig. 4.. The collar 62 is bolted to the retaining ring 64 by means of the bolts 63*. Therefore, the collar 62 is detachably connected to the rear end of the neck 49.

As above pointed. out", the ring 65 is secured to the flange. 64 by means of the bolts 61 as shown in Figs; 3, 5 and. 6', the ring 65 being cylindrical in shape to. afford a housing for the annular collar 62;. An inwardly extending flange 66 on the housing 65' serves to retain the neck 49 against outward movement on the bearing 85. That is to say, since the ring 6! fits in the groove 69 of the neck 49 and the: ring 6| is secured to the annular collar 62 the flange 66 locks the neck 49 on the bearing 85. v

In order to lock. the cutter bar 39 for feeding movement in. a selected plane of operation, latch mechanism is provided in connection with the. pe

ripheral portion of the annular collar 62. As shown in Fig. '1 two diametrically

opposed notches

68, 68 are located in the periphery of the collar 62. As shown in Fig. 4 the ring 65 is provided with an outwardly extending bracket 69. Onthis bracket is pivotally mounted a plate 10 of polygonal or' other suitableconfiguration, which is turnable about the pivotal axis II. By means of the handle 12 on the plate 19 the latter may be moved from its full line position to its dotted line position shown in Fig. 4.

As shown in Fig. '7 the bracket 69 is provided with a guideway 13 for the spring pressed latch I6 which is adapted to fit into either of the

notches

68, 68 to lock the collar 62 in adjusted position and therefore lock the cutter bar 36 in its selected plane of operation. 7

The latch I6 is operatively connected by means of the link 11 to the actuating plate 19. A pin 18 pivotally connects one end of the link TI to the latch 16 and a pin I8 connects the other end of the link to the operating plate I0. Inside of the bracket 69 is a retaining seat 14 for a spring 15 which extends into a cylindrical recess in the rear end of the latch 16. When the operating plate "10 is moved from its full line position to its dotted line position as shownin Fig.4 the latch 16 is released from its notch 68 against the action of the spring 15, and when the plate 10 is released the spring 15 urges the latch 16 against the peripheral surface of the collar 62 in readiness to automatically snap into the next notch 68.

It is preferred that when the latch mechanism is released and the brake'applied to'effect rotary adjustment of the cutter head 29 on the horizontal axis of the shaft 46, the collar 62 as viewed in Fig. '7 shall rotate anti-clockwise so that when the latch is released the spring 15 will act to urge the inner end of the latch 16 along the cut away portion 62', thereby permitting the face 'of the notch 68 to act as an abutment or limit stop. Therefore, as soon as the neck starts to rotate the handle '12 of the latch mechanism may be released and the brake held applied with the assurance that the limit stop 9-5 will definitely'and accurately stop the rotation of the neck at exactly the pre-selected position whereupon the latch will automatically snap into the notch 68 and prevent further rotation of the neck 49. If the brake is held applied after the latch 16 reaches the abutment 95, the drum 55 will slip relatively to the brake shoes. In other Words, thebrake mechanism will act in the nature of a friction clutch to permit slipping when the rotation of position.

It should'be particularly noted that the turn-,

over movement for, the operation of inverting the chain kerf cutter is effected at a relatively rapid rate of speed. When it is desired to effect a turnover movement of the cutter head the latch 16 is released, the brake shoes 56' applied to the drum 55 and as soon as the neck 49 starts to rotate the latch mechanism may be released; The drum 55 being connected to the shaft 46' asshown in Figs. 3, 5, and 6, the speed of rotation of the pinion 54 as it walks around the stationary annular gear 55 effects a quick turnover movement of the cutter head 29.. During this turnover movement theclutch 35 may be in neutral position so that the cutter chain is not sirable to controlthe motor 22 to always rotate in the same direction, but this does not interfere with the desired turnover movements because it may be made through in an anticlockwise direction asviewe'd'in Fig. '7. e

As shown in Fig. 3 the radial support 59 is provided with cups 'or recesses I9, 19 for containing lubricant. The bottom of recess 19 is provided with an opening 8IJ which registers with an opening 82 in the bushing 8| for supplying lubricant to the shaft 46. Lubricant from the recess l9 passes along the groove 83 to the bearing

bushings

85, 86 and 81. 7

It will also be seen by referring to Fig. 3 that when the sections 90 and 9| of' the clutch35 are brought into engagement by actuation of either lever 31, 31 '(Fig. 5), the sprocket 32 of the kerf cutter is rotated. Suitable anti-friction bearings are provided for the shaft 33. A pipe 92 'may be provided for supplying lubricant to the lower bearing I49.

the bearing I49.

A ring plate I48 encircling the shaft 33 may be fitted in place on the cutter head 29 as shown in Fig. 3 to prevent escape of lubricant from the bearing I49 into the chamber where the clutch 35 is located. The upper bearing I 49' may be lubricated after removing'the screw plug 48. The cover 48" may be detachably secured to the housing 48 as shown in Fig. 3; by removing thecover the parts shown are rendered accessible for inspection or repairs.

In operation the chain kerf cutter may cut horizontal kerfs throughout a considerable range of elevations due to the adjustments at the screw posts I9, I9, I9 and such adjustments and elevations may be still further increased by rea- Lubricant seals 93 may be provided to prevent escape of lubricant from son of the rotary adjustment of the neck 49 on the horizontal axis of the shaft 46. The kerf cutter may be adjusted not only in elevation but also in inclination because the adjustments at I9, v I9, I 9 may be individually effected by means of power operated mechanism. The plane of the cutter bar always remains at right angles long wall rectilinear feeding movements not only in the face extending across the space in ad- Vance of the mine track but also in the ribs. parallel to the mine track. In making such rectilinear feeding movements thekerf cutter must be in a plane parallel to the plane of the mine track but when the truck is stationary on the mine track the kerf cutter may be located in an incline plane relative to the level of the mine track because when arcuate swinging movements are effected the axis is at right angles to the plane of the cutter bar. Furthermore, as above pointed out, arcuate feeding movements may be made in opposite directions with the cutter bits on the advance side or edge of the cutter bar always emerging from the coal vein so as to effectively sweep the cuttings therefrom.

The shaft 33 maybe extended, through the cover 48" and the drum 55 connected thereto, with the friction mechanism of Fig. 6 connected between the cover 48" 'andthe drum, so that when the'shaft 33 is held stationary and the shaft 46 is rotated, the rotation of the gear 41' 1 will turn'the head over on theaxis of the shaft 43, since the gear 41 can not rotate on its own axis. However, I prefer to use the construction illustrated because better control may be obtained of the turnover movement.

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

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

1. In a mining machine, the combination with a wheeled truck movable on a trackway, of kerfcutting mechanism mount-ed thereon and comprising a plane chain kerf-cutter, mechanism for adjusting the inclination of said kerf-cutting mechanism to the horizontal, power-operated mechanism for effecting rotary adjustment of said kerf-cutting mechanism on a horizontal axis into a plurality of planes of operation, means adapted to stop said kerf-cutter in a predetermined position of said rotary adjustment, and motor-operated mechanism for operating said kerf-cutting mechanism including the feed of said kerf-cutter.

2. A mining machine comprising the combination with a truck, of a horizontally extending neck, means for horizontally swinging the said neck, a cutting tool, means supported by the neck and supporting the cutting tool on the neck, a neck shaft in the neck, means operatively connecting the neck shaft and the cutting tool for cutting, and mechanism operable by the neck shaft for effecting adjustment of the cutting tool into a plurality of different planes, the said mechanism including a shaft extending parallel to the neck shaft, operating mechanism at one end of the shaft and interconnecting the said shaft with the neck shaft, a pinion on the other end of the said shaft, a drum, an annular gear within the drum and meshing with the said pinion, the gear and drum normally revolving around the pinion, and brake mechanism for securing the drum and gear against rotation, whereby the pinion runs around the gear to effect an arcuate adjustment of the cutting tool.

3. In a mining machine, the combination with a portable base, of an elongated chain kerf-cutter comprising an elongated cutter bar, a support for said kerf-cutter rotatably mounted on said base, a shaft extending along the axis of said rotatable support, power-transmission mechanism between said shaft and said kerf-cutter to drive the same, friction mechanism for effecting adjustment of the kerf-cutter into a plurality of different planes by transmitting a turning movement from said shaft to said rotatable support and automatic means for positioning said kerfcutter at a predetermined plane of adjustment.

4. In a mining machine, the combination with cutter supporting and directing means movable on a trackway into operative position at right angles to a face, of cutter mechanism supported thereon comprising a cutter chain-carrying cutter bar adapted to cut a path for itself when presented edgewise to the face, power mechanism operable responsively to operation of the cutter mechanism for effecting a rotary adjustment of the cutter bar into predetermined planes, and spring-pressed lock mechanism adapted to stop the cutter mechanism in a predetermined position and to hold the cutter mechanism in said predetermined position,

5. A mining machine comprising the combination with a wheeled truck movable on a track way, of a turntable on the truck, cutter mechanism supported by the turntable and comprising a cutter head and a cutter bar, power transmis-, sion mechanism for operating the cutter mechanism, and mechanism driven by the said power transmission mechanism for effecting rotary adjustments of the cutter bar, the said mechanism including a shaft, a drive pinion on the shaft, a drum, an internal gear in the drum meshing with the drive pinion for normally rotating the drum, and brake means on the drum for braking the drum to enable the pinion to run around the said ring gear to effect turn-over movements of the cutter mechanism.

6. A mining machine comprising the combination with supporting means movable on a trackway, of cutter mechanism thereon comprising a cutter bar having a chain adapted to cut a kerf in a face when the said bar is presented thereto, mechanism supported by the truck for moving the bar either angularly across the end of the truck or longitudinally relative to the trackway at a feeding speed to out either a right angle or a parallel face, mechanism for effecting a rotary adjustment of the bar on a horizontal axis to cut a kerf in the face in a plurality of different planes, and means for stopping and securing the mechanism in a predetermined adjusted position, the said means including a latch, spring means normally urging the latch into latching engagement with the said mechanism, and means for withdrawing the latch from the said latching engagement.

'7. A mining machine comprising the combination with a wheel truck adapted to travel on a mine track, of a turntable mounted on the truck for adjustment relatively thereto, kerf-cutting mechanism, a support for the said mechanism including power transmission mechanism therefor, a housing for the kerf-cutting mechanism rotatably mounted on the support, and means operated by the power transmission mechanism for effecting a rotary adjustment of the kerfcutting mechanism, the mechanism including a normally rotating drum, and brake mechanism on the drum for holding the drum stationary for enabling the said means to turn over the cutting mechanism.

8. A mining machine comprising the combination with cutter supporting and directing means movable on a trackway into operative position relative to a face, of cutter mechanism sup ported thereon,'and adjusting mechanism for effecting turn-over movement of the cutter mechanism, the said adjusting mechanism including a drum, means for rotating the drum relatively to the cutter mechanism, and releasable friction mechanism for holding the drum stationary while enabling the rotating means to continue operating, thereby effecting turn-over movement of the cutting mechanism.

9. A mining machine comprising the combination with cutter supporting and directing means movable on a trackway into operative position relative to a mine face, of cutter mechanism supported thereon, and tum-over mechanism for the cutter mechanism, the said turn-over mechanism including a drum, means for rotating the drum relatively to the cutter mechanism, and releasable brake mechanism on the exterior of the drum adapted to grip the drum to hold it stationary.

-10."'A mining machine comprising the oornbination with cutter supporting and directing means movable on a trackway into operative position relative to a mine face, of cutter mechanism sup ported thereon, adjusting mechanism for the a cutter mechanism, and means for locking the cutter mechanism in adjusted position, the said means including. a collar associated with the cut ter mechanism and rotatable therewith and provided with latching recesses, the said collar having its peripheral surface eccentrically formed adjacent one side of each of the notches, thereby providing an abutment at the opposite side of each notch for engagement by a latch to guide the latch into the notch and to prevent overturning of the cutter mechanism, a latch member adapted to fit into the said notches, and releasable means for pressing the latch into engagement with the periphery of 'the said collar and for causing the latch to snap into engage- 'ment with the said notches upon either'notch and its adjacent abutment becoming presented to. the latch;

11. In a mining machine, the combination with a body, of a kerf-cutting mechanism pivotally mounted thereon for pivotal movement about a substantially horizontal axis, power-operated mechanism for rotating said kerf-cutting mesh anism on said axis, means adapted to stop rotation of said kerf-cutting mechanism at any one of a plurality of desired predetermined positions, and motor operated mechanism for operating said kerf-cutting mechanism to effect a cutting operation. a g

, 13. A mining machine comprisng the combination with a body, 'of a kerf-cutting mechanism having a head pivotally mounted on said body for pivotal movement about a substantially horizontal axis, a motor, a shaft adapted to be driven by said motor for driving said kerf-cutting mechanism, said shaft having an axis common. with said first mentioned axis and extending from said body into said head, a second shaft carried by said head and having an axis parallel to and spaced from the axis of said shaft, gears connecting said shafts, a pinion onsaid second shaft, a drum having an internal ring gear in mesh with said pinion, said drum being normally free to rotate under the influence of said second;

shaft, and means to restrict rotation of said drum while said second shaft is rotated whereby said head will rotate with respect to said'body.

14. A mining machine comprising the combi nation with a body, of a kerf-cutting' mechanism having a head pivotally mounted on said body for pivotal movement about a substantially horizontal axis, a motor, a shaft adapted to be driven by said motor for driving said kerf cutting mechanism, said shaft havingan axis common with said first mentioned axis and extending from said body into saidhead,,.a second shaft carried by said head and having an axis parallel to and spaced from the axis of said shaft, gears connecting said shafts, a pinion on said second shaft, a drum having an internal ring gear in mesh with said' 'pinion, said drum being normally free to rotate under the influence of said second shaft, and means to restrict rotation of said drum while said second shaft is rotated whereby said head will rotate with respect to said body, said means comprising a brake mechanism.

15. A mining machine comprising the combination with a body, of a kerf-cutting mechanism having a head pivotally mounted on said body for pivotal movement about a substantially'horizontal axis, a motor, a shaft adapted to be driven by, said motor for driving said kerf-cutting mech anism, said shaft havingan'axis common with said first mentioned axis'and extending from said body into said head, a second shaft car-i.

ried by said head and having an'axis parallel to and spaced from the axis of said shaft, gears connecting said shafts, apinion on said second shaft, a drum having an internal ring gear in mesh with said pinion, said drum being normally free to rotate under the influenceof said second shaft, and means to restrict rotation of said head pivotally connecting said cutter-bar to said body for pivotal movement about an axis substantially parallel with the plane of said cutterbar, a motor driven shaft extending from said body along said axis and into said head for driving said cutter-chain, a second shaft, said second shaft being carried in said head on an axis parallel with and spaced from the axis of said motor driven shaft, said shafts being interconnected, a pinion gear carried by said second shaft, and stationary means attached to said body for effecting a driving connection between'said gear and said body whereby rotation of said second shaft will produce. rotation of said head prising a brake and means for operating said brake.

17. In a mining machine, the combination with a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutterbar head pivotally connecting said cutter-bar to 7 said body for pivotal movement about an axis substantially parallel with the plane of said outter-bar, a motor driven shaft extending from said body along said axis and into said head for driving said cutter-chain, a second. shaft, said second shaft being carried in said head on an axis parallel with and spaced from the axis of said motor driven shaft, said shafts being interconnected, a pinion gear carried by said second shaft, a drum loosely journaled to said body for rotation about the axis of said motor driven shaft, said drum having an internal gear in mesh with said pinion gear, and stationary brake meansfor restricting thefree rotation of said drum where by rotation of said second shaft will produce rotation of said head about its pivotal axis.

18. In a mining machine, the combination 7 1th a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutterbar head pivotally connecting said cutter-bar to said body for pivotal movement about an axis substantially parallel with the plane of said outter-bar, a motor driven shaft extending from said body along said axis and into said head for driving said cutter-chain, a second shaft, said second about its pivotal axis, said stationary means comshaft being carried in said head on an axis parallel with and spaced from the axis of said motor driven shaft, said shafts being interconnected, a pinion gear carried by said second shaft, a drum loosely journaled to said body for rotation about the axis of said motor driven shaft, said drum having an internal gear in mesh with said pinion gear, and brake means carried by said body for restricting the free rotation of said drum whereby rotation of said second shaft will produce rotation of said head about its pivotal axis.

19. In a mining machine, the combination with a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutterbar head pivotally connecting said cutter-bar to said body for pivotal movement about an axis substantially parallel with the plane of said cutter-bar, a motor driven shaft extending from said body along said axis and into said head for driving said cutter-chain, a second shaft, said second shaft being carried in said head on an axis parallel with and spaced from the axis of said motor driven shaft, said shafts being interconnected, a pinion gear carried by said second shaft, stationary means attached to said body for effecting a driving connection between said gear and said body whereby rotation of said second shaft will produce rotation of said head about its pivotal axis, and means adapted to stop rotation of said head in predetermined positions.,

20. In a mining machine, the combination with a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutterbar head pivotally connecting said cutter-bar to said body for pivotal movement about an axis substantially parallel with the plane of said outter-bar, a motor driven shaft extending from said body along said axis and into said head for driving said cutter-chain, a second shaft, said second shaft being carried in said head on an axis parallel with and spaced from the axis of said motor driven shaft, said shafts being interconnected, a pinion gear carried by said second shaft, stationary means attached to said body for effecting a driving connection between said gear and said body whereby rotation of said second shaft will produce rotation of said head about its pivotal axis, and means adapted to stop rotation of said head in predetermined positions, said last named means comprising a notched ring attached to said head for rotation therewith, a spring-pressed latch carried by said body and adapted to ride on said ring and snap into a notch therein when said latch is opposite said notch.

21. In a mining machine, the combination with a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutter-bar head pivotally connecting said cutter-bar to said body for pivotal movement about an axis substantially parallel with the plane of said cutter-bar, a motor driven shaft extending from said body along said axis and into said head for driving said cutter-chain, a second shaft, said second shaft being carried in said head on an axis parallel with and spaced from the axis of said motor driven shaft, said shafts being interconnected, a pinion gear carried by said second shaft, stationary means attached to said body for effecting a driving connection between said gear and said body whereby rotation of said second shaft will produce rotation of said head about its pivotal axis, and means adapted to stop rotation of said head in predetermined positions, said last named means comprising a ring attached to said head for rotation therewith and having abutments, a spring-pressed latch carried by said body and adapted to ride on said ring and to strike :said abutments.

22. In a mining machine, the combination with a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutter-bar head pivotally connecting said cutter-bar to said body for pivotal movement about an axis substantially parallel with the plane of said cutterbar, a motor driven shaft extending fro-m said body along said axis and into said head for driving said cutter-chain, a second shaft, said second shaft being carried in said head on an axis parallel with and spaced from the axis of said motor driven shaft, said shafts being interconnected, a pinion gear carried by said second shaft, stationary means attached to said body for effecting a driving connection between said gear and said body whereby rotation of said second shaft will produce rotation of said head about its piovtal axis, means adapted to stop rotation of said head in predetermined positions, said last named means comprising a notched ring attached to said head for rotation therewith, a spring-pressed latch carried by said body and adapted to ride on said ring and snap into a notch therein when said latch is opposite said notch, and means for rendering said stop means inoperative.

23. In a mining machine, the combination with a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutterbar head pivotally connecting said cutter-bar to said body for pivotal movement about an axis substantially parallel with the plane of said cut-terbar, a motor driven shaft extending from said body along said axis and into said head for driving said cutter-chain, a second shaft, said second shaft being carried in said head on an axis parallel with and spaced from the axis of said motor driven shaft, said shafts being interconnected, a pinion gear carried by said second shaft, 2, stationary means attached to said body for effecting a driving connection between said gear and said body whereby rotation of said second shaft will produce rotation of said head about its pivotal axis, means adapted to stop rotation of said head in predetermined positions, said last named means comprising a ring attached to said head for rotation therewith and having abutments, a spring-pressed latch carried by said body and adapted to ride on said ring and to strike said abutments, and means for rendering said stop means inoperative.

24. In a mining machine, the combination with a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutterbar head pivotally connecting said cutter-bar and said body for pivotal movement about an axis substantially parallel with the plane of said outter-bar, a motor, driving connections between said motor and said cutter-chain for driving said cutter-chain, means for rotating said head about its axis, and means operating automatically to stop rotation of said head in a predetermined position.

25. In a mining machine, the combination with Lil ill

a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutterbar head pivotally connecting said cutter bar and said body for pivotal movement about an axis substantially parallel with the plane of said cutter-bar, a motor, driving connections between said motor and said cutter-chain for driving said cutter-chain, means for rotating said head about its axis comprising means for effecting an iniposi tive connection between said motor and said'head, and means operating automatically to stop rotation of said head in a predetermined position.

26.'In a mining machine, the combination with a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutter-bar head pivotally connecting said cutter-bar and said body for pivotal movement about an axis substantially parallel with the plane of said outter-bar, a motor, driving connections between said motor and said cutter-chain for driving said outter-chain, means for rotating said head about its axis comprising means for effecting, an impositive connection between said motor and said head, and means operating automatically to stop rotation of said head in a predetermined position. said stop means'comprising a notched ring attached to said head for rotation therewith, a spring-pressed latch carried by said body and adapted to ride on said ring and snap into a notch therein when said latch is opposite said notch.

27. In a mining machine, the combination with a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutter-bar head pivotally connecting said cutter-bar and said body for pivotal movement about an axis substantially parallelwith the plane of said outter-bar, a motor, driving connections between said motor and said cutter-chain for driving said outter-chain, means for rotating said head about its axis comprising means for effecting an impositive connection between said motor and said head, and means operating automatically to stop rotation of said head in a predetermined position, said stop means comprising a ring attached to said head for rotation therewith and having abutments, a spring-pressed latch carried by said body and adapted to ride on said ring and to strike said abutments.

'28., In a mining machine, the combination with a body, of a kerf-cutting mechanism including a plane cutter-bar and a cutter-chain, a cutterbar'head pivotallyconnecting said cutter-bar and said body for pivotal movement about an axis substantially parallel with the plane of said cutter-bar, a motor, driving connections between said motor and said cutter-chain for driving said outter-chain, means for rotating said head about its axis comprising means for effecting an impositive connection between said motor and said head, and means operating automatically to stop rotation of said head in a predetermined position,

said stop means comprising a notched ring at-' tached'to said head for rotation therewith, a spring-pressed latch carried by said body and adapted to ride on said ring and snap into a notch therein when said latch'is opposite said notch,

and means for rendering said stop means inoperative.

ter-b ar, a'motor, driving connections between said motor and said cutter-chain for driving said cutter-chain, means for rotating said head about its axis comprising means for effecting an impositive connection between said motor and said head, and means operating automatically to stop rotation of said head in a predetermined position, said stop means comprising a ring attached to said head for rotation therewith'and having abutments, a spring-pressed latch carried by said body and-adapted to ride on said ring and to strike said abutments, and means for rendering said stop means inoperative.

30. In a mining machine, a frame, a motor thereon, a cutter head disposed forwardly of said motor, said cutter head including a support memher, a frame member disposed forwardly thereof and carried thereby for pivotal movement about an axis extending longitudinally of said frame, a projecting cutter bar carried by said framememher having a cutter chain movable thereabout, means for driving said cutter chain about said cutter bar comprising a shaft, a drive connec tion from said motor to said shaft, and a drive connection from said shaft for rotatably moving said frame member about an axis extending longitudinally of saidsupport member including a gearmounted in said support member for rotatable movement with respect thereto, a geared connection from said shaft to said gear and yieldable means operably connectible with said support member for selectively locking said gear from movement with respect to said support member and permitting said gear to move with respect thereto upon overload thereof.

31. A mining machine comprising the com akerf in a face when'the said bar is presented thereto, means for moving the said bar transversely of the trackway, and mechanism for effecting a rotary adjustment of the bar to cut a second kerf in theface parallel to the firstmentioned kerf, the said mechanism comprising a ring gear intermeshing with a pinion, the pinion being positioned interiorly of the gear and being adapted to drive the gear during kerf-cutting operations, and means for securing the gear against rotation, thereby causing the pinion to ride around the gear for effecting a turning-over of the position of the cutter bar.

NILS D. LEVIN.