US1997076A - Mining machine - Google Patents

Description

T. E. PRAY MINING MACHINE April 9, 1935.

Filed Oct. 15, 1931 9 Sheets-Sheet 1 IIIL WHHU HHHMW--- H bx N wm April 9, 1935.

T. E, PRAY MINING MACHINE Filed 001;. 15, l95 l 9 Sheets-Sheet 2 177mm" T hmo'yfl fiy April 9, 1935. T. E. PRAY 1,997,076

MINING MACHINE Filed 001';. 15, 1931 9 Sheets-Sheet 5 T. E. PRAY MINING MACHINE April 9, 1935.

Filed Oct. 15-, 1931 9 Sheets-Sheet 4 April 9,1935. T. E PRAY 1,997,076

MINING MACHINE Filed Oct. 15, 1951, 9 Sheets-Sheet 5 Jiforn cg April 9, 1935. T. E. PRAY 1,997,076

MINING MACHINE Filed 00%. 15, 1951 9 Sheets-Sheet 6 III/Z April 9,1935. v T, IE; PRAY 1,997,076

MINING MACHINE Filed Oct. 15, 1931 9 Sheets-Sheet "III-Fl 1 Eiinl'.

J07 v m7 \ imr 97 ,5 15. mu

108 19 QIIDE E E PE J03 J26 J08 April 9, 1935. T. E, PRAY 1,997,076

' MINING MACHINE Filed Oct. 15, 1951 9 Sheets-Sheet 8 MINING MACHINE April 9, 1935. T. E. PRAY Filed Oct. 15, 1931 9 Sheets-Sheet 9 llll 'llllllllllllll (Illl Illllllll Illll D W j'fizTen/vr -P WZOIZEJ/ Patented Apr. 9, 1935 UNITED STATES MINING MACHINE Thomas E. Pray, Chicago, 111., assignor to Good man Manufacturing Company, Chicago, 111.; a

corporation of Illinois Application ctober 15, 1931, Serial No. 568,912

20 Claims.

This invention relates to improvements in min--' ing, machines of the truck mountedtype capable of cutting a kerf adjacent the mine bottom in front of the track or. at various elevations and planes with respect thereto including shearing cuts at either side of the machine, and hasas its general objects to provide a new and improved machine of the class described constructed with a view towards ruggedness, compactness, adaptability and ease and simplicity of operation.

A prior application, Serial Number 157,005, filed December 15, 1926 by William :T. -McCullough and entitled Improvements in mining machines, which issued as Patent No. 1,891,917 on December 20, 1932, discloses a machine of the general type shown in my invention. My invention is, however, an improvement overthat shown in the McCullough patent in that a new and improved means is provided for supporting the cuttingelement for cutting in the various desired angles and planes with respect to the mine bottom and anew and improved means is provided for feeding and positioning the cutting mechanism together with a new and improved safety 25 feature to safeguard against breakage of the mining machine driving mechanism or actuating mechanism therefor. 7

Other more specific objects of my invention will appear from time to time as the following specification proceeds.

My invention may be more clearly understood with reference to the accompanying drawings wherein:

Figure 1 is a top plan view of the device of my invention showing the cutter bar in position to cut a kerf adjacent the mine bottom or at vari-' ous elevations with respect thereto and showing various other cutting positions of the cutter bar by dotted lines; 40 Figure 2 is an enlarged partial longitudinal sectional view of the forward or'cutting end of the device embodying my invention;

Figure 3 is an enlarged side elevation of the rearward portion of the device embodying my invention with parts broken away and in section to more clearly show the details thereof;

Figure 4 is an enlarged partial plan View of the device embodying my invention with the cutter bar positioned for making a-shearing cut in the mine wall and with parts broken away and in section; Iv

Figure 5 is an enlarged fragmentary plan View of the rearward portion of the device of my invention with parts broken away and in section;

Figure 6 is an'enlarged fragmentary plan view of the forward portion of the device of myinvention showing otherparts broken away and in section than are shown in Figures 2 and 4; y

Figure 7 is an enlarged detail view of theforrward portion of the device of my invention with i certain parts broken away and injsection; Figure 8 is an enlarged sectional view taken on line 8-8 of Figure 6;. .r ;m Figure 9 is an enlarged partial endelevation" of the rearward portion of the cutting mechaev l0 nism and means for supporting the same with parts broken away and in section; 1

Figure 10 is an enlarged detail fragmentary plan view of a portion of the rearward portion of the device embodying my invention; Y

s Figure 11 is a sectional view taken substantially on line li -H ofFigure 10; and Figure 12 is a diagrammatic view of the wiring, connections of the deviceof my invention; 3 w

Like numerals refer to like parts throughout the various figures. 1 7 w Referring now in particular to the embodiment of my invention illustrated in the accoin panying drawings, atruck It is provided which, is supported on wheels I l and axles 12- A turhtable I3 is provided on the forward end of said truck and supports a cutting element indicated? at M for limited movement with respectthereto about a transverse axis and for complete rotational movement about a longitudinal axis.

The cutting element indicated at M includes suitable actuating mechanism herein. shown-as an electric motor I5 adjacent its rearward end, a central portion l6 secured to the forward-end of the motor l5'and extending forwardly there-v from and supported in a relatively,1ong;;bear-; ing member I'! in ,a manner, which will hereinafter be more fully described, a cutter framel8 extending forwardly from the bearing member I! beyond the extremities of the truck "land 40- a cutter head l9 supported by said cutter frame for movement towards and away from said cutter frame. The cutter head 19 is provided with a cutter bar 20 having; a cutter chain: 2| ,of' an ordinary construction movable thereabout in" a;

usual manner. l l I I A motor 23 is provided on the truck rearwardly of the turntable, l3 for operating said; turntable and the feeding and truck driving mechanism;

Said motor is provided with a motorpinion 24 shaft 21 adjacent its opposite end andmeshes ,5;

with and drives a spur gear '29 on a shaft 30. The shaft is provided with a. sprocket 3|, which sprocket is connected with the rearward truck wheels! I for driving said truck wheels by means of a suitable chain and sprocket drive indicated at 32. The forward and rearward truck wheels and axles may be connected together in a suitable manner well. known to those familiar with the art; as,f.or instance, a chain andsproclret drive not herein shown since it is no part of my invention. p The pinion 28 is adaptedto be selectively connected with the transverse shaft 21 and said shaft is adapted to be drivenat. one speed by mounted on the transverse shaft 21".

collar 39- is feathered the-transverse shaft 21 "the sleeve26 and at another speed; through a.

suitable gear train connected with said sleeve in a manner which will hereinafter be more fully described sothe truck .Il] may bedrivenabout the mine by the motor 23 at either a low feed ing speed or high traveling speed. The method I between the inner end of the sleeve 23 and the gear-33. The clutchcollar 39 has clutch iews onopposite sides thereof adapted tomeshwith clutch jaws 4'2-"onthe inner end of thesl'eeve 26 or clutch jaws 43 on the face of the spur gear 38 so the transverse shaft 21 mayeither be driven directly through the sleeve 26 or may be driven at a reduced speedthrough the plhi'odflgspur gear-35, pinion 31 and spur gear.

The clutch collar 39 is shifted along the transverse shaft 21 to engage the clutch jaws 40 with eitherv the clutch jaws-42 or; 43 and cause the transverse shaft 21 to be driven at either a, highf or low" speed by means of a suitable system of levers which includes a clutchfork 44' operated.

by asuitable hand l'ever45 in' a usual manner.

A clutc h collar 41 is feathered onthe trans shaft21 and has suitable clutch jaws thereon adapted to engage suitable clutch jaws on flieface of the pinion 28 for selectively driving said pinionand the truck' from the transverse shaftfl fer-ring now in particular to the means for driving the turntable t3 from-the motor 23- at a plurality of speeds; aworm "is keyed on the transverse-shaft 21 and meshes with and drives a worm gear 49 journaledon its hub within a frame member 50 which serves as a means for enclosing said worm and worm gear.

'endzof the vertical shaft 56 is j'ournaled within truck 10.

; Hspur pinion 511s keyed to the vertical shaft 58 adjacent-its lower end and meshes with and drives-a spur gear 53 journaled on a vertically extending Stud 60 supported in the truck frame Ill. The spur gear 59 in turn meshes with teeth 6| cut on the outer periphery of the turntable l3 for driving said turntable. Thus'the turntable I3 may be turned at a highv speed equal to the speed of the sleeve 26 or at-a'lower'speed f at the speed of the spur gear 38. This'provides a high speed for positioning the cutter bar 20 and a lower speed for feeding said-cutter bar while cutting. "1

While the mining machine is ordinarily fed feeding means are provided for feeding said mining-=machine where the. cutting conditions are, exceptionally'bad which herein comprises av rope'drum 62 keyed on a sleeve63freely, mounted on the vertical shaft 56 and having'its lower end abutting the upper face of the spurpinion 51. Glutch jaws 54' extend upwardly from the 7 sleeve and are adapted to be engaged by suitable clutch jaws depending from the sleevelSl for driving the rope drum' 62' at either a'highor.

low speed when desiredin an: obvious manner,

Suitable locking means are provided to pre-' vent turning of the turntable whenever the truck is being driven onits track wheels. Said means} hereincompri'se-a latch member having a slot.

BS-themin. A- bolt 61 is-provided forsupporting respect thereto; The 'bolt61- passesfthrough.

the slot 58- in the l'atch'member'65 and th member is relat ively long and is provided with a.

lower half 1% and-a',top. half 1"I'. The top and bottom halves are adapted to completely surf-- round the central portion Riot-the, cuttingv ere ment l4 and are of substantially the'sanie. length the latchmember 65 forslidable movement with assaid; central portion and, are. held. together. 7

in a suitable manner well known; to. those. familiar with the art; as, for instance, nuts and'bolts.

Trunm'on shafts 12 extend outwardly from opposite sides ofthe lower half 10 of thebearing member l1 and are journaled in trunnion, supports 13 secured to the. upper face of the turntable and extending forwardly therefrom. at a point adjacent the forward end of. thdtruck. when the cutting element is in alongitudinal position with respect 'to saidtruck. :;Thus.the}v 3 bearing member l1 and the entire cuttingelement may be, tilted about theaX-is of the trunni'on'shafts 12 for adjusting the angle, oflthe.

litter bar with. respect. to. the'mine bottomto compensate for a. Ditching seam .or anuneven .mlnehott m. I With reference in particular to Figures, 2. ;4j

and 6, it may be, seenthat the bearingrnember l IT is ati elvl ns so. as to. provide. a. longbealni ing surface for they cutting. element I ly and lrigid. ly support saidcutting element whencutting in, a horizontal plane or planes inclined witn spect tothe horizontal. Thev central portionof' within this recessed portion adjacent therearward end thereof and' is adapted'to be meshed -into the coal on the track wheels ll, additional thereto.

with a spur pinion I5 freely mounted on a longitudinally extending shaft 'lfijournaled' within the cutting element I4 and adapted to be selectively connected. to said shaft by means of a clutch collar 'Iland clutch jaws .18 in; a'usual manner. Saidlongitudinally extending 'shaft'iis driven from them'otor I5 in a manner which will hereinafter be more fully described for turning the entire cutting element I4 about a longitudinal axis within the bearing member I! including the'motor I5, cutter frame I8, and cutter bar-20.

Suitable means. are provided for locking the cutting element M to the bearing member I'I during the cutting operation. Said means may be of any type well known to those familiar with the art but is herein preferably shown as being a pin :68 of enlarged diameter adapted to register with apertures 68? in the top half 'II of the bearing member I! and the central'portion I6 of the cutting element I4. The pin 68 is operated by a suitable hand lever 69 pivotally supported on the top half II of the bearing member I! and locked in its various operative or inoperative positions by means of suitable locking means in a usual manner. With such an arrangement the cutterbar may be held in a steady position for cutting in planes inclinedwith respect to the horizontal as readily as cutting in horizontal planes along the ground or at various elevations .with respect Referring now to the means for supporting the rearward end of the cutting element I I-and moving said cutting element about the axis of the trunnion shafts I2, a boss I9 extends rearwardly from the rearward cover for the motor I5 adjacent the longitudinal central portion thereof. Said boss isjournaled within a member 89 adapted to extendupwardly and rearwardly therefrom. The vertical portion of the member 89 is guided within a vertically extending guide formed within'a portion 8| of a support member 83 fixed to the turntable I3 and extending rearwardly therefrom. I a

The means for tilting the cutter bar and moving the cutting element about the axis ofthe trunnion shafts I2 is supported on stud shafts 84 extending outwardly from opposite sides of a casing 85 for a worm gear 86 andworm 81 and journaled in the support member 83. Said worm gear is journaled within the casing 85 and has a threaded bore adapted to receive a threaded shaft 88 having its upper end pivoted to the rearwardly extending portion of the member 89. Said worm is driven by a shaft 89 by means of hand wheels 99 on opposite sides thereof so that rotation of either hand wheel 99' will rotate the worm gear 86 which will translationally movejthe threaded shaft 88 therethrough and which willin turn pivot the entire cutting element about the axis of the trunnion shafts I2 for adjustingthe angle of the cutter bar 20 with respectto the mine bottom. 3

Referring now in particular to the cutter head I9 and cutter bar 20 andmeans for supporting said cutter head for movement towards and away from the cutter frame I8, a pair of parallel spaced guides 92 are provided on opposite sides of the cutter frame It adjacent'the rearward end thereof. Said parallel spaced guides depend downwardly from the cutter frameWIB when the cutter bar 28 is disposed so as to cut a horizontal kerf adjacent the mine bottom and are adapted to be engaged by parallel spaced'guides 93'extend ing upwardly from opposite sides of a support 'frame I8.

member "94 for thecutter head-"l9.'- Each guide 92 is provided with agib 95'extendingforwardly therefrom and integral therewith anda'dapted to engage a corresponding recess in each parallel spaced guide 93. A portion of each parallelspaced .7

guide'92 extends outwardly and around and abuts the side of each parallel spaced'guide 93-and a retaining member 96' is secured to the forward face of each parallel spaced guide 92. Each retaining member 96 abuts the forward face-offs. parallel spaced guide 93 for supporting 1 said guides for movement along the parallel spaced guides 92 towards and away from thecu'tter With reference to Figures 2, 6 and 7'; itrna'y be seen that the parallel spaced guides 92 and 93 are of a relatively heavy construction to adequately support the cutting element I4 and pre vent spreading of said guides.- Furthenthefgibs' 95, which engage corresponding recesses in the parallel spaced guides 93, areprovided to aidin guiding the parallel spacedguides 93 for movement along the parallel spaced guides92 and to the threaded shaft 99 extends through and below the memberSB and hasa spur'pinion' IEH keyed thereto. A nut I02 is threaded on the lower end of said shaft and abuts the lower face of the spur pinion IOI for holding said pinion onto said shaft. a A portion of the threaded shaft 99 adjacent the top side of the member98' is shouldered and abutsfthe top portion of the member 98 while the top face of the spur pinion IBI abuts the lower side of the member 98 so that rotation of the worm gear I99 will cause translational r'riov mentof the threaded shaft 99 withrespe'ct thereto which will move the support member94 there with'along the parallel spaced-guides 92-towards and away from the cutter frame 18.

The support member. 94'has" acutter bar supporting member I93 journaled therein and de= pending therefrom. An annular ring I64 is""se-' cured to the top portion of the cutter bars'u'pporting member I93 and abuts a shoulder I05 in the support member 94 for holding said cutter bar supporting member within the support mem-' ber 94 andpe'rmitting said-cutter bar" support: ing member to be turned within said support member. v

The cutter bar supporting member I 3 "sup? f ed shaft 99 will cause pivotal movement of the cutter bar supporting member I ca within the support member 94 for positioning or, arcuately feeding the cutter bar ZBalong the coal face.

It should be noted that the teeth of the pinion I9I and the rack I95 are curvedto permit move-l ment of'the rack IIJB'by the pinion ifli' during the cutting operation and to compensate for into the coal while positioned to one side of the track in a position substantially parallel to the track for permitting a kerf to be cut in the coal along the minebottom in front of the minetrack. Said -means may be of any type well known to those skilled in the art but herein comprises a pin I01 supported within the support member for vertical movement with respect thereto and adapted to engage any one of a number of apertures I08 adjacent the outer edge of the annular ring I04 and cutter bar supporting if member I03 which pin is operated by a suitable system of levers in an'obvious manner.

Referring now in particular to the means for rotating the threaded shaft 99 and arcuately feeding'or positioning the cutter bar 20, a clutch sleeve I09 is feathered to the threaded shaft 99 and has clutch jaws II depending therefrom and adapted to engage clutch jaws I I I extending upwardly-from the worm gear I00. The clutch sleeve I09 is supported within a cylindrical portion of the cutter frame I8 for vertical movement with respect thereto and is vertically moved to engagethe clutch jaws IIO with or disengage said clutch jaws from :theclutch jaws III and selectively drive the threaded shaft 99 from the worm gear I00 by means of a suitable system of levers well known to those familiar with the art ,(not' shown). Thus when the clutch jaws IIO engage the clutch jaws III and the worm gear I00 is being driven by the motor I5, rotation of the threaded shaft 99 is effected, and when the clutch jaws II-0 .are disengaged from the clutch jaws III, said threaded shaft is translationally moved through the worm gear I00 for adjusting the positionof the cutter bar 20 with respect to the mine-bottom. t M

The worm gear I00 is driven by a worm I-I2 freely mounted on the forward end of thelongitudinally extending shaft I6 and selectively connected to said shaft by means of a clutch collar I I3 providedwith clutch jaws ll dadapted tomesh with clutch-jaws II integral with the worm H2 in a usualmanner. Thus when .the cutter bar 'is positioned parallel with the mine bottom, said cutter bar maybe arcuately moved by 'means of the spur-pinion MI and rack I06 for feeding. said cutter bar across the face of the coal or positioning said cutter bar so it may be fed across'the' faceof the coal below the mine rails by means of the turntable I3. When the cutter bar 20 is in a perpendicular position with respect to the mine bottom on either side of the truck I0 as is shown by dotted lines in Figure 1 the spur pinion IOI may be used to arcuately move the cutter, bar 20 in a vertical plane for feeding said cutter bar vertically with respect to the face of the coal for making a shearing cut in the mine wall..

' Referring now in particular to the mechanism for driving the cutter chain 2| about the cutter bar 20 and actuating the feeding and positioning mechanism for the cutting element I4 and cutter bar 20, the motor I 5 is provided with an armature shaft] I6-having an armature pinion I I1 keyed to its forward end'.. Said armature pinion meshes with and drives a'spur gear I I 8 keyed to the rearward: end- 0f a longitudinally extending shaft I I 9 journaled, in suitable bearingsupports within 7 the central portion I6 of the cutting element I4. A bevel pinion I20 is keyed to the forward. end of the longitudinally extending'shaft H9 and meshes with and drives a. bevel gear I2;I}journaled at oppositeends of its hubwithinthe cutter frame I8.of the cutting element I4, The-lower portion of the hereof the hub of the bevel'gear I2 I' is splined and is adapted to been a ed by a splined shaft I23 slidably movable with respect thereto. Said splined shaft extends from the bevel gear I2I and is adapted to slidably engage'the' splined'bore of a sleeve I24 journaled within the cutter bar supporting. member I03 for driving said sleeve from the bevelgear I2 I The sleeve 1 20 is secured within the cutter bar supportingmember I03 ina usual manner and hasa cutter'chain sprocket I25 keyed thereto for driving the on chain 2'I about the cutter bar 20. a V V The longitudinally extending shaft I6 is adapts ed to'be driven from themotor I5 in reverse directions without reversal of the motor in the following manner: I I

A pair of bevel'gears I2Iisfreely mounted on the longitudinally extending shaft I:I-9.- 'Said bevel gears face .each otherandmesh. with a bevel gear I20 journaled on its hub within the central portion I6 of the'cutting element.

Suitable friction clutch mechanism is provided for driving either of said: bevel gears from the longitudinally extending shaft ll9iwhich maybe of any type well known to those familiar'with the art but which is herein shown as being friction clutches of the cone type. An internal cone I29 is integralwith each bevel gear -I2I. External cones I30 are integral with opposite ends of a clutch collar 'I3I feathered on ,the longitudinally extending shaft H9 and eachofthe'se cones is adaptedto engage an internal cone I29; The cones I30 are so arranged on the clutch collar I3 I that only onebevel gear I Z'I-may be driven at a time. It may thusbe seen thatwhen one cone I30 engages one internalcone I29 and one bevel gear I2'I is driven from the longitudinally ex--' tending shaft II'9 that the'bevel gear I20 is rotated in one direction and that when the other bevel gear I2I is driven by the longitudinally vex-f T tending shaft'I-I9,v the bevel gear I28 is rotated in an opposite direction.

A stub shaft I337is keyed to the bevel gear I28 and has a worm I34 keyed thereto. The worm I34 meshes with and drives a worm gear I35 keyed to a longitudinally extendingshaft I36. 7 The worm I34 and worm gear I35 are of the self-locking type so designed that the cutting element may be held in any desired position with respectto the turntable Iiiuntilv locked in a cutting position by external means which will hereinafter be morefully described. 'Aspur gear I3! is keyedto the shaft I36 and meshes with anddrives a-spur gear I38 keyed to thelongitudinally extending shaft I6 for driving said shaft;

It may now be seenthat the entire cutting element maybe reversely turned about a longitudinalaxis by'means of the motor I5 without reversal of said motor, for positioning the cutter Referring now in particular'to another of the novel features of my invention which includes a means-to prevent overload of the cutting or feeding mechanism during thecutting operation, the cutting motor I5 is connected 'to the feeding motor 23 in such a manner that an overload on said cutting motor will cause said feeding motor to be disconnected from the lineandthus prevent overload of the cutting mechanism and so that an overload on they feeding motor. 23 while driving the feeding or'traveling mechanism ateither a--high-or low speed will. cause said feeding motor to be disconnected from the line.

With reference to Figure 12, it may be seen that power is. transmitted to the cutting and feeding motors by means of suitable conductors and an electric cable reel I39 which may be selectivelydriven from the transverse shaft 21 in-ausual manner to wind an' electrical conduc tor onior unwind an electrical conductor from said reel asthe machine is traveling about the mine or being fed into thecoal. 'A positiveconductor I 46 leads from the cable reel I39 to the cutting motor I5 and the feeding motor 23. A controllerindicated at I43 is provided to start the-cutting motor I5 by cutting out a resistance indicated at I44 in a-usual manner. Another controller indicated at I45 is provided to cut out aresistance indicated at I46 in a usual manner to start the feeding motor 23. Thecontrollers I43 and I45 are provided with blow-out ci1s I4'I and I48, respectively, to prevent arcing between the controller contacts during the start ing operation. I

A conductor I49 leads from the negative side of the cutting motor I and controller I43. to the cable reel I39 and the negative side ofthe line. A conductor I53 leads from the controller I45 through a contactor I5I, overload relay I52and series. resistance I53 to the conductor I49and negative side of the line. g

An overload relay I 55 is provided'to cut off current from a coil I56 for operating the com tactor I 5I the coil for operating the overload relay I55 being connected in series with the'conductor I49 so that anoverload on the cuttin motor circuit will operate said relay.

A coil I51 is provided to open the overload relay I52 upon overload of the feeding motor 23. The overload relays I 52 and I55 are normally closed and are only open upon overload of either'the cutting or feeding motor circuits. When either of the relays I 52 or I55 are open the circuit to the coil I56 for, the contactor ,I5I is openedwhich opens said contactor and thus o'pensthe circuit for the feeding motor 23 to stop said motor upon overload in either the cutting or feeding motor circuits.

Current is transmitted to the coil I51 for opening the overload relay I52 through the conductor I56 and contactor I5I. The series resistance I53 is provided to effect opening of the overload relay I52 upon a certain predetermined overload of the feeding motor circuit. Another resistance I58 is shunted across the coil I56 and is adapted to be connected with said coil through a switch indicated'at I59 to effect opening of the overload relay I 52 at a 'differentpredetermined overload than when directly connected throughthe series resistance I 53.

Thesswitch I59 has an operating handle I60 connected thereto, which handle is connected to' the hand lever 45 for changing the feeding or traveling speeds from a high to a low speed by means of a crank lever I 6I and a link I62. The crank le'verIBI and link I62 are so arrangedwith respect to the operating handle I60 and-hand lever '45 that when the clutch jaws II]v engage the clutch jaws 42 for operating the feeding or traveling mechanism'at a high speed, the switch I59 is closed and the resistance I58 is shunted across the overload relay operating coil I56, and

range said coil that the overoad relay I52 will drop out at substantially the same load on the gear train when operating at a low rate of speed asat a high rate of speed. It may be seen that such anarrangementis very desirable and is an added safeguard to the feed gearing in that the reduction gears in the feeding ortraveling gear train are under a greaterload at a given load on the motor 23 when effecting feeding or traveling at a low speed than when effecting feeding or traveling at a high speed. Thus it is necessary that the overload relay I52 dropout at a lesser load-on the motor 23 whenthe machine is being fed or is traveling at a low speed than at a higher speed. 7

It may thus be seen that-during the traveling or cutting operation and upon overload of the feeding and traveling gearing that the overload relay I52 will open at the same load on said gearing'while operating at eithera'high or low speed which will open the circuit to the coil I5'I for the contactor I5I and open said contactor It may also be seen that during the cutting "operation when the cutter bar 20 is being fed into the coal or across the face offthe coal'and said cutter bar hits an obstruction in the coal measure whichcause's an undue load on the cutting mechanism, that this load will be transmitted to the cutting motor I5 which willcause the overload relay I55 to open and whichwill cut out the feeding motor 23 from the circuit.v This'will stop feeding of the machine and allow the cutte bar 23 to'freeitself, T 'It may now be seen'that newand improved means has been provided tostop feeding. of the machine during overload of the cutting or travel ing or feeding mechanism, and that this means is so arranged as to operate. at. substantially the'same load on the feeding or traveling gear train while the machine is, traveling or feeding at either a high orllow rate of speed.

It may now be seen thata new and improved mining machine has been provided of a rugged, compact and accessible. construction" which is adapted to cut a kerf adjacent the minetop or bottom in front of the mine rails or at various intermediate positions and planes with respect thereto; that a new and improved means has N) V ingbr moving said cutting element in reverse been provided for supporting the cutting mech ouiitreversal tof the driving motor therefor, and

anism forr'icutting in any desired angularly disposed plane with respectto the :mine bottoni which efliciently supports the cutting element so it "1 may cult a kerf as efficiently 1111 '9? Vertical plane or plane inclined with respect to the verti- 7 sales in, a horizontalplane: that a new and improved frictionally controlled gearing arrangement has been provided for positioning the cutter rbar to cut the variousdesired kerfs and fort'feeddirections abou't alongitudinalsaxis orraxis perpendicular with'respect to the longitudinal with- .that a new and improved safetymeans has been provided to prevent overload of either the cutting or feedin'gmechanism and consequent break- ,age of either the cutting or feeding parts.

'Although .lihave herein shown and described one embodiment of-myiinvention, it will be understood that the construction and arrangement of thevariousparts may be :altered without departing from the spirit and scope thereof. Furthermore, I do not wish to be construed as limiting myself to the specific form illustrated,'excepting as it maybe specifically limited in the appended claims. r

' I claim'as my invention:

1. In a mining machine of the class described, a truck, a turntable on said truck, a cutting element including a motor, a cutter frame extending forwardly therefrom and beyond the forward extremities of said truck, a cutter head extending from said cutter frame and supported thereon for movement towards and away from said cutter frame, and means for supporting said cutting eleinent'on saidtruck for complete rotational move- 'rnent aboutalongitudinal axis and' pivotal move- 'ment'about a transverseaxis comprising a relatively long bearing member trunnioned' on said a turntable andsurrounding and having bearing en-,

gagement with said cutter frame forwardlyfof said motor and rearwardly of said cutter head and 'a vertically movable member having bearing "engagement with the rearward end of said motor adjacent the longitudinal central axis thereof;

2: In'a mining machine of the class described, atruck, a cutting elementincluding a motor, a cutter frame extending forwardlyv therefrom and beyond the forwardextremities c: said truck, a

cutter head extending from said cutter frame and supported thereon for movement towards and away fromisai'd cutter'frame, means for support? 'irigsaid cutting element onfsaid truck for com plete 'rotationalrmovement about a longitudinal axis'and pivotal movement about a transverse axis comprising a relatively long bearing member trunnioned on said j truck and surrounding and having bearing engagement with said cutter frame forwardly of said motor and rearwardlyof said cutterhead, and means formoving said cutting element about a transverse axis and holding said cutting element from lateral movement with respect to said truck comprising a vertically extending-guide anda member having bearing engagement with the rearward-end of saidmotor adjacent thelongitudinal center line thereof and supported'for vertical movement in said guide.

, 3. 1m a mining machine of 'theclass described,

a a truck, a-cutting element including a motor, a

cutter frame extending forwardly therefrom and 'beyondthe forward'extremitiesfiof said truck, a

cutter .head extending from said cutterframe and supported thereon for, movement towards and away from said cutter frame, means forsup porting'i'said cutting leiement :oir said truck m f 'completetrotattonel movement about a 'tudinai axis comprism a relatively" long membersupported on surrounding and having bearing engagement with said cutter. 1

frameforwardiy'of said motor and m mm c said cutter head, andmeans driven by said lnoto'r for rotating said cutting element within said bearing member comprising an inter-rmi gear'm to the inner of safi :bearing meniber andlgear reduction :means within said cutting element connecting with said gear. r

'4'. m a mam. man; or ithe' clnss await a truck, a cutting elementxirmluding'fa mama cutter frame extending forwarddthere'from rind beyond the forward extreniitie'si of said' attack, a

cutter head extendingirom said cutter ifr'amie and supported thereon" for internment-towards and awayfrom saidrcuttermeans for 'sup'pmx ing-said cuttingeie'rnent on said truck for com plete rotational movement: about a longitudinal axis comprising a relatively long bearing member f 7 supported :on' said trunk and surrounding and having bearing engagementwith'said cutter frame forwardly of said mom: and rearwardly of said cutterzhead, and means driven by motorfor' rotating said cutting element within saidabearing member in revrse direotions without'reversal of said motor comprising-an internal gear fixed tothe inner periphery ofsaidrbearing mambenrand gear-reduction means including reverse gearing supported in said cutting element and connect ing said motor with said internal :gear.

5. In a mining machined! the. class described, a truck, acutting element including amotor, a

cutter frame extending forwardly therefrom and beyond the forward extremities of said truck, a V

cutter headextending fromsaidcutter frame and supported thereon :for; movement towards and away from said cutter frame, means for supportingsaid cutting element-on said truck'for'complete rotational movement about a longitudinal axis comprising a relatively long bearing member supported on said truck and surroundingfiarid having bearing engagement with said cutter frame forwardly of said motor and .rearwardly V of said cutter head, and frictionally controlled means driven by said motor for. rotating said cutting element within said bearing member. in reverse directions withoutreversal of said motor comprising an internal gear fixed to the'inner periphery'of said bearing member, and gear reduction means supported within said cuttingeiemerit. including frictionally controlled reverse L gearing for selectively connecting said motor,

said cutter frame forwardly 01"; said :motor and rearwardly of said cutter headrmeans driven by said motor for rotating said cutting element within; said bearing member comprising a' gear train including aninternal gear fixed to the in= ner-periphery-of :said bearing member, and means and away from said cutter frame, means for sup-- porting said cutting element on said truck for complete rotational movement about; a longitudinal axis comprising a' relatively long bearing member supported on said truck and surrounding, and having bearing engagement with said cutter frame forwardly of said motor and reare wardly of said cutter head, means driven bylsaid motor for rotating said cutting element within said bearing member in reverse, directions without reversal of said motor comprising an internal gear fixed to the inner periphery of said bearing memberand gear reduction means within said cutting element for connecting said motor with said internal gear including reverse gearing and a worm and worm gear, and means for holding said cutting element in a fixed position with respect to said bearing member-during the cutting operation. a

8. In a mining machine of the class described, a truck, a cutting element including a motor, a cutter frame extending forwardly therefrom and beyond the forward extremities of said truck, a cutter head extendingfrom said cutter frame and supported thereon for movement towards'and away from said cutterframe, means for supporting said cutting element on said truck for complete rotational movement about a longitudinal axis comprising a relatively long bearing member supported on said truck and surrounding and having bearing engagementwith said cutter frameforwardly of said motor and rearwardly of said cutter head, frictionally controlled means driven by said motor for rotating said cutting element within said bearing memher in reverse directions without reversal of said motor comprising an internal gear fixed to the inner periphery of said bearing member and self-locking gear reduction means within said cutting element for selectively connecting said motor with said internal gear including frictionally controlled reverse gearing and a'self-locking worm and worm gear, and means for holding said cutting element in a fixedposition with respect to said bearing member during the cutting operationcomprising ,a pin and aperture lock.

9. In a mining machine of the class described, .a truck, a cutting element supported thereon including amotor, a cutter frame extending forwardly therefrom beyond the forward extremi ties of said truck, a. cutter head movable towards and away from said cutter frame, and means for guiding said cutter head formovement towards and away from saidcutter frame comprising a pair of gibbed guides extending laterally from said cutter frame adjacent opposite sides thereof including grooved rearward faces, cooperating gibbed guides on said cutter head engageable with and slidable along said first mentioned gibbed guides including tongues engageable'with the grooves in said grooved rearward faces of said first-mentioned guides, portions extending along the sides of said first-mentioned guides, and a retaining member engaging the forward end of said first-mentioned guides for holdingsaid first and second mentioned gibbed guides i iengagement with each otherand adjustingand supporting means interposed between said cutter head and cutter frame forwardly of said gibbed guides.

10. 'In a mining machine of the class 2.de-'

scribed, a track mounted truck, a turntable on said truck, a feeding motor, acutting element including a motor, a cutter frame extending forwardly of said motor beyond the forward ex.- tremities of said truck, a cutter head supported by said cutter frame for movement towardsand away from said cutter frame, said cutter head having a chain carrying cutter bar thereon mounted for movement aboutan axis perpendicular to the plane surface of said cutter bar,

means for supporting said cutting elementeon' said turntable for complete rotational movement about a longitudinal axis comprising a bearing member supported on said turntable and surrounding and having bearing engagementwith said cutter frame forwardly of said motor, means connectible with said feeding motor fornturning saidturntable and feeding said cutter bar'across the face in front of said truckormoving said having a geared connection with a cutter chain for driving said cutter chain about said'cutter bar, and another shaft parallel with said first mentioned shaft and driven thereby by means of a worm and worm gear.

11. In a mining machine of the class; described, a track mounted truck, a turntable on said truck, a feeding motor, a cutting element supported on said turntable including a motor, a cutter bar extending forwardly therefrom have; ing a cutter chain movable thereabout and driven by said motor, means connectible with said feeding motor for turning said turntable and feeding said cutter bar. across the face in front of said truck or moving said. truck longitudinally of the trackway for feeding said cutter bar intothe coal face or longitudinally along the face of the coal, means operable independently of said cutter chain drive motor for disconnectingsaid feeding motor from its source of power supplyon overload thereof, and other means operablein'e dependently of said means for disconnecting said feeding motor from its source of power supply for connecting said first and second mentioned motors together so an overload on said cutter chain and. said second mentioned motor will stop said feeding motor.

12. In a mining machine of the class described,

ter bar across the face of the coal in front of said" truck or moving, said truck longitudinally of the trackway for feeding said cutter, bar into the coal face or longitudinally along the face of the coal, means operable independently of said outting motor for disconnecting said feeding motor from its source of power supply onv overload thereof, and other means operable independent- 1y of said meansfor disconnecting said-feeding cutting ;motor circuit, a contactor in said feeding motor circuit and means for connecting said overload relay withsaid. contactor..so that overload of said cutting motorwill open said'relay which will cause said contactorto open and thus open" said feeding motor circuit. a l I '13. In a mining machine 'of-the class described, a track mounted truck,aturntable on said'truck, abutting element mounted onsaid'turntable ineluding a projecting chain carrying cutter bar, 7

amotor on said truck,=means driven by said motor for driving-said turntable at a plurality of predetermined speeds for feeding said cutter bar across th'eiront of the; truck or positioningsaid cutter baruin various positions with respect to said truck, means driven by said motor for movingisaid truck about the track at "a plurality of speeds'for feeding said cutter bar longitudinally V along 'the track at a low speed or moving said truckiat a higher speed, change speed gearing, an electrical circuit for operating said motor on said truck,;an overload relay in said circuit, a resistanceconnect'ed in seriesiwith said relay, another resistance-shunted across the circuit of said're lay, 'and means connected with said change speed 'gearin'g' forj cutting out said shunt resistance when operating at a low speed and connecting said shunt resistance in the circuit when operating at ah'igh speed for equalizing the current throughsaid overload relay and allowing said relay to operate upon overload of said change speedgearing independent of overload of said motor. 14.]In a mining machine of theclass' described,

' atrack mounted truck, aturntable on said truck,

a cutting elementmounted on saidjturntable including a cutter bar'extending"forwardly of said truck having a cutterchain movable thereabout and a motor 'for driving' said cutterchain, a motor on said truck, means driven by said motor for driving said turntable a t-a plurality of predetermined'spe'eds for feeding said cutter bar'across the front of the truck orpositioning said cutt'er bar in various positions with respe'ctto saidtruck,

means driven by said motor for moving said truck about the track at aplurality of speeds for feeding said cutter bar longitudinally alongthe track at a low speed or moving said truck at a higher speed, change speed gearing-an electrical circuit for operating said motorjon said truck and said motor for driving-said cutter-chain, an overload relay having 'itsoperating coil connected in series with said feeding motor, a resistance connected in series with said relay, another resistanceshunted across the circuit of said relay, nieanscorinected with said change speed gearing to cut out said shunt resistance when operating at a low speed and connect said shunt resistance in the circuit whenoperating'at'a'high speedand equalize the current through said overload relay and allow said overload relay to operate upon overload of said change speed gearing independ-,

ent of overload of said motor, another overload relay' connected' in series with said cutter chain drlvingmotor, and means for connecting said relay with said feeding motor sothecircuit to said feeding motor will be broken upon-overload ,of said cutter chain and said cutter chain driving motor. 7 V V 16. 11 a mining machine,-=feeding and cutting mechanism therefor, change" speed gearing" for said mining machine whereby said mining machine may be fed at either a highjor lowspeed, a motor for operating said feeding. mechanism, an electric circuit for operating said feeding mo tor, and means whereby saidfeeding motor may automatically be disconnected from said electric circuitv upon overload of said feeding mechanism irrespective of overload ontsaid motor lcomprising overload circuit breaking means in said .electric circuit, a'resistance connected in series with said overload circuit breaking means, another resistance shunted across the circuit ofsaid circuit breakixiggmeans, and means connected with said change speed gearing-for cutting said shunt resistance outrof said circuit when feeding at a low speed and cutting said shunt resistance into said circuit when feedingv at a high speed. 16. In a mining machine, feeding and cutting mechanism therefor, changespeed gearingfor Said mining machine whereby said mining Inachine may be fed at either a high or low speed,

a motor for operating said feeding mechanism,

an electric circuit for operating said feeding motor, and means whereby said feeding 'moto'r may automatlcally be disconnectedfrom said electric circuit upon overload ofsaid feeding mechanism irrespective of overload on said motor 'comprising overload circuit breaking means in said electric "circuit, a resistance connected in series with said overload circuit'breaking'means, another resistance shunted across the circuit of said circuit breaking means, and means connected with said change speed; gearing for cut-,

ting said shunt 'resistance'out of said circuit when feeding at a low speed and cutting said shunt resistance into the circuit when feeding at a high speed comprising an electric switch and a'connection from said switch to said change speed gearingp 1 17. In a mining machine, feeding and cutting mechanism therefor, change speedgearing for said mining machine whereby said miningmachine may be fed at either a higher low speed including a gearshifting member, a motor for operating said feeding mechanism, an electric circuit for operating said feeding motor, andmeans whereby said feeding motor may automatically be'disconnected from said electric circuit upon overload of said feeding mechanism irrespective of overload on said motor comprissaid'mining machine at a high speed.

18. In a miningmachine,,feedingtand cutting mechanism therefor, change speed gearing for said mining machine whereby said mining' nachine may'befed at either a high or low speed in- V eluding a gear shifting'member, a'motor for op crating said feeding "mechanism, an electric circuit for operating saidfeeding motor, and means whereby said feeding motor may automatically be-disconnected from said-electric circuit upon overload of said feeding mechanism irrespective of overload on said motor comprisingfoverload circuit breaking means in said electric circuit," a

resistance connected in series with said overload circuit breaking means, another resistance shunted across the circuit of said circuit breaking means, and means connected with said change speed gearing for cutting said shunt resistance out of said circuit when operating at a low'speed and cutting said shunt resistance into the circuit when operating at a high speed comprising an electric switch and an operative connectionfrom said switch to said gear shifting member.

19. In a mining machine, feeding and cutting mechanism therefor, change speed gearing for said mining machine whereby said mining machine may be fed at either a high or low speed, a motor for operating said feeding mechanism, another motor for operating said cutting mechanism, an electric circuit for operating said feeding and cutting motors, an overload relay having its operating coil connected in series with said feeding motor, a resistance connected in series with said overload relay, another resistance shunted across the circuit of said overload relay, means connected with said change speed gearing for cutting out said shunt resistance when saidfeeding mechanism is operating at a low speed and connecting said shunt resistance in the circuit when said feeding mechanism is operating at a high speed for equalizing the current through said overload relay and allowing said overload relay to operate upon overload of said change speed gearing independent of overload of said motor, another overload relay connected in series with said motor for driving said cutting mechanism and an electrical connection from said relay to said feeding motor so the circuit for said feeding motor will be broken upon overload of said cutting mechanism and said cutting mechanism driving motor.

20. In a mining machine, a truck, a turntable on said truck, a cutting element on said turntable including a motor, a cutter frame secured to and extending forwardly of said motor beyond the forand surrounding and having bearing engagement with said cutting element rearwardly of said cutter head and forwardly of said motor.

THOMAS E. PRAY.

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