US959756A - Excavating-machine. - Google Patents

Description

e. W. KING, HJ. BARNHRT ai c. B. KING.

EXQAVATING MACHINE. APPLIGATION FILED xm. zo, 1909.

' Patented aySLww.

"G. w. Imm-H. J. BARNHART s C. B .xnt

BXGAVATING MACHINE. ArPLIoATIoH FILED 111111.20, i909.

Patented May 31, 1910.

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W. KING, H. J. BARNHART an. 3.1mm.

EXCAVTING MAHINE. l ArPLIoATzoK FILED 11.13.20, 1909. f

. Patented May 31, 1910.

4 SHEETS-SHEET 3.

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G. 1y. KING, n. s. 'BARNHART a. c.

,13. KING.

1 BXGAVATING MACHINE. PrLIoATIon num 1.12.20, 1909. 959,756.

Patented May 31, 1910.

4 SHEETS-SHEET 4.

UNTTED STATES PATENT oEETcE.

GEORGE W. KING, HARRY J. BARNHART, AND CHARLES B. KNG, OF ,MARIOBL OHIO, ASSIGNORS TO THE MARION STEAM SHOVEL COMPANY, OF MARION, OHIO, A COR- PORATION OF OHIO.

EXCAVATING-MACHINE.

Specification of Letters Patent.

Patented May s1, 1910.

To (L'ZZ whom it may concern:

Be' it known that we, GEORGE 1V. KING, vHARRY J. BARNHART, and CHARLES B. KING,

citizens of the United States7 residing at Marion, in the county of Marion and State of Ohio, have invented certain new and useful Improvements in Excavating-Machines, o't which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to excavating inachines, and is more particularly designed for use in connection with power shovels of the general Vtype usually hnown as steam shovels.

The object of the invention is to provide such a shovel with electrical driving means, and, to this end, it is a further object of the invention toprovide automatic motor controlling means whereby the motor or motors of the,- driving mechanism will be protected against excessive current and whereby the motor or motors will be so controlled as to cause the saine to exert a continuous pressure or pull upon the dipper, or other excavating member, when excessive resistance is -otfered to the movement of that dipper or member, without the liability of the motor building up beyond the danger point.

A further object of the invention is to provide an electrically driven mechanism of this character which can be readily substituted for the ordinary operating mechanism ot a lsteam shovel and the substitution of which will require but slight alteration in thecons'triictioi'i of the shovel as a whole; further, to so arrange and combine the several parts ot the operatino mechanism as to attain a high degree of efficiency, and, at thel same time, to so place the mechanism as to econoniizc space and distribute the weight thereof at points where it is most desirable; and further, to so arrange and locate the manual controlling devices for the motors that the saine will be within convenient reach otthe operator and that the operation and location ot' the same will be substantially the same as the. operation of the controlling devices 'for the steam shovel.

W'ith these objects in view oui'V invention consists in certain novel features and in certain combinations and arrangements ot' parts hereinafter tov be described, and then more particularly pointed out in the claims.

In thel accompanying drawings,li`igure 1 is a si de elevation of a power shovel embody-y ing our invention; Fig. 2 is a top plan view ofthe same; Fig. 3 is a top plan view ofr a portion of the' boom, showing the crowding mechanism; Fig. 4 is a conventional illustration' 'of the motor-controlling meehanisni, with the main circuit open and the master controller at zero; Fig. 5 is a. similarview; with the main circuit closed and the master controller-set for third Speed; and Fig. 6 is a detail view showing the action of the overload circuit breaker.

In these drawings we have illustrated one embodiment of our invention and have shown the same as comprising a main trame or Acar body 1 mounted upon the usual trucks' 2. The main frame is provided at its forward end with a boom 3 so supported upon the main frame as to be movable about a verti cal axis. An excavating member or dipper 4 is supported from the boom 3 by an arm 5 which is movaloly mounted thereon. The construction ot the shovel so far described is that of the ordinary Steam shovel, and, to substitute the electrical driving mechanism for the steam driving mechanism the-balance wheels lo r disks are removed from the sha-tt 6 and the bevel gears 7 are substituted therefor. The engines and the engine bed arealso removed and in their place are mounted two vertically arranged parallel castings or bearing plates 8, on the upper ends of which is supported a shaft 9 journaled in suitable bearings 10 and having secured thereto a' cable drinn 11 and a gear 12 adapted to mesh with'a pinion 13 carriedby a shaft 14 journaled in bearings 15 formed in the castings 8 at a point beneath the bearings of the shaft 9. Mounted on the shaft 14 is also a gear 16 adapted to mesh with a pinion 17 carried by one end of a counter or reducing-shaft 18, on the opposite end of which is a gear 19v adapted to mesh with a pinion 20 mounted on a shaft 21 of a motor 22. This motor is preferably ot the usual reversible street car type and is not shown in detail, but is indicated only by its inclosing casing. The swinging-drum'll has wound thereon a cable 23 which extends about guides 24 and about a vertical drum 25 secured to the boom 3 and adapted to move the same aboutits vert-ical axis when the cable is actuated. The bevel gears 7 carried by the shaft 6 mesh with bevel pinions 26 mounted on shafts 27 'arranged longitudinally of themain frame 1 and having their rear ends provided with 34 is a gear 38 which meshes with a pinion 39 mounted on a shaft 40 to which is secured suitable'sprockets or driving disks 41 about which extend driving chains 42 and 43 which also extend about the corresponding sprocket wheels 44 and 45 on the axles of .the front andrear trucks, respectively, whereby means are providedfor propelling the shovel from ,one pointl to another, the druin 35 being connected' to the shaft34 by the usual friction clutch mechanism, which is not here shown. This operating mechanism as a. whole is the same as employed in asteam shovel withthe exception of the substituted parts comprising, principally, the bevel gears 7, pinion i 26, shafts 27 and their'operating motors, to.-

gether with the supporting plates or castingsl 8 and the motor for actuating the parts carried'thereby, the remaining gears and their shafts being standard par-ts of a steam shovel. Consequently, it requires but avery slight change to transform a steam shovel iinto an electrically driven shovel.

Anfelectrically ydriven air'compressor 46 is mounted on the main frame 1 and is connected by a pipe 47 with an air storage tank y4,8,"wliich, in turn, is connected by a piupe 49 with the cylinder 50 of a suitable brakeol'pleratinglnechanism for the hoisting drum. This brake-operatingy mechanism forms no part` of the present invention and is substantially the `same as that shown"l in Patent No. 666,348, granted to King and Barnhart Jany. 22, 1901, the principal difference being in the combination of an electrically operated air compressor with the brakefoperating mechanism. v I i The crowding mechanism is substantially the same as that of a steam shovel, it being modified only to such 'an'1 extent, as is neces sary to applyl the electrical power thereto.

As here shown,`the arm 5 carrying the dip'- per 4 is provided with teeth` 51 which mesh .with pinions 52 carried by a shaft 53 journaled in bearings- 54. on the boom 3. This shaft is rovided on opposite sides of the boom' Wit gears '55 which mesh. with pinions 56 carried b Ithe outerends of a counter l or reducing sha t 57 supported .on the boom 3 and havingy a gear 58adapted to mesh withja pinion 59 on 'the shaft GO-Aof the motor 61. -Suitable brake-mechanism is provided for controlling the movement of the dipper should the motorxbecome inopf' erative or should it be desirable t0 check the movement of the dipper for any reason. To

the motor with a drum 130 which is rigidly A this end we have provided the shaft- 60 of secured to the shaft and about which eX- y tends a brakeband 131,4 the opposite ends of which are secured to a lever 132 which is pivotally mounted on the boom 3, as shown at 133. One end of the band is secured to the lever at its pivotal center andthus hasno movement relatively to the boom, while the other end of the band is secured to the lever 132 at a point removed from its piv;- otal center, whereby the movement of the lever about its pivotal center will cause the brake band to be tightened about the drum and to resist itsinovement. The lever 132. I

is connected by means of a' rod 134 to one arm .of a bell crank lever 135 which is pivotally mounted on the boom 3 at 136 andhas its other arm provided with a foot plate 137. A weight 138 is secured tothe be'll crank lever on that side of its pivotal center opposite the foot plate 137 `in such a manner as to hold the foot plate normally raised and thus maintaining thebrake band in its inoperative position.. The' lever 135 and the foot plate 137 are arranged within convenient reach of the operator for the crowding mechanism, and. should the current be suddenly cut out of the motor or should it become desirable for any other reason-to control the movement of the clipper, hel can instantly a ply the brake thereto.

Indepen ent controlling means are pro-l vided for the motors operating the hoisting, swingingl and crowding mechanisms, respectively. These controlling mechanisms are substantially the same and, therefore, we will describe but one ofthe .same and .this description will applyto the three controlling mechanisms. For the purposes of this description we will use the controlling mechanism for the hoisting motors. It may be noted here that the arrangement of the hoisting mechanism is such as to enable two motors to be utilized and further to enable these motors to be placed in the rear of the drivenvmechanism and in ai-position in whichy they are not only out of the way, but in which the .weight will be disposed toward the rear of the car. Further, two small motors can be started or stopped with much less effort than can` a single motor of a horsepower equalV to the combined horse-powers.l of the two motors. Consequently, there is less acceleration with two motors than with on'e.y These two motors are controlled in common from a single controlling mechanism, which mechanism is such as toautomatically control the successive cutting out of the resista-nce to increase the current tothe motor, to so control the current to the motor as to cause the motor to exert a oon- .tinuous pressure or pull upon the dipper 4 esegue ance, as by coming in contact 'With a ledge of rock, without permitting the inotor to build up to the danger point. Further, this controlling mechanism is such as to l Veak the main circuit and cut out the motor entirely should the currentbecoine 'excessive for any reason, such., for instance, theI failure of seine part of the controlling inechf anism to operate.

In Figs. 4 and 5 the Inain circuit 'is indicated at 62 and is provided with a generator 63 which is provided with a service switch -which point. the circuit is divided, one part extending through the line (30,.through the hinged arin ot" a circuit breaker (37 tto a point (S8, thence through a clrcuit breake (3S) to a point 70, thence through a'solenoid'u forining" the electromagnetic operating means for the-circuit breaker and closer A.. The current passes from the solenoid L through a line 71 to a point 72, thence upwardly vto a point 73 where it is connected with the negative side of the niain circuit, thus conipleting the circuit through the solenoid (l.

asf

main circuit.

and closing the circuit breaker A in the The mechanism is now in its operative position and is under the control of vthe master controller X, which is ot the ordinary type. This master controller is, as usual, divided into two parts, right and left, indicated by R and L, respectively, and the operating handle operated in-one direction .or the other to actuate the inotor in a for- Ward or reverse direction. When the handie has been turned in one direction, say to the left, a single notch the contact bars 74, and 70 will be inoved into engagement with the contact 4fingers 77, 7 8 and 79,respectively. This act-ion oi the master controller closes the controlling circuit through the circuit breakers and closcrs on the opposite sides of the armature as follows: rlheI main circuit passes 'from the point 05 through the coil 91 of the overload magnet, through the line 92, Icircuit breaker and closer A, line 93 to 87, thence through the vline 86 to the point Softhrough the line 83 and theoseveral circuit breakers and closers 84A to the .point 82 where the circuit divides anda part lpasses through euch of thesolenoids f and cv of lthe circuit breakers and velosers F and G yto the point 81, Where the tvvo branches ot, thereirc'uitv againnnite and extend through the Iine to the Contact yfinger'78 `of the masterzeontroiler, thence matures oi both n'iotors. armature 10i?J the circuit follows the line 102i through the contact bars 75 and 7 4, finger 77 to the point 72;l thence through the line 71 to the negatire side of the circuit at 73. The circuit is thus completed through the Asolenoids and, g/ and actuates the circuit breakers l" and G, closing these circuit breakers and closcrs and coinpletingthe niain circuit, and, at the sain ltime, closing the circuit breakers and clpsgrs 88 and 8%). The action oi thel solenoid ai. as served, at the saine tiine the circuit breaker and closer A. was closed, to open the circuit breaker and closer 00, thus causing` the current to pass 'from the point` G8 to the point v70 through a resistance 90, but maintaining a sutticient current through the solenoid c to retain the circuit breaker and closer A in its closed position. These several steps having taken place the main circuit G2 extends lroin the point oi division (i5 through the solenoid 91 of the overload circuit breaker and closer, through the line 02, 'circuit breaker and closer A, line 93, solenoid 94 ot a circuit breaker and closer 05 located in the controlling circuit of the second circuit breaker and closer B, as will bc hereimiitcr described, thence througrlithe line and the several sections ot' resistance indicated at R,

R3 and R4, through the line97 and solenoid 98 of asccond circuit breaker and closer 99" located in the controlling; circuit of the circuit breaker .and closer B, thence through theline 100, through the circuit breaker and closer (i. line 101 and the arinature 102 of the Inotor. We have here shown but one armature, but in the hoisting` mechanism the circuity will pass through the ar- After leaving the through the circuit breaker and closer lf, through the line 10%-, thence through the series field 105 of the motor and from the field magnet to the line 10G and the negative side ot the main circuit ($2 at the point-73, thus completing the power circuit through the motors and operating the motors at their slowest. speed,`as the current through all the resistance.

In Fig. 5 ofthe drawings the circuits are shown with the several part-s in the posi tions just described, but, in this drawing, the

`master controller X has been advanced to -the third notch, thereby cutting out two i sections o'f the resistances and operating the motor at about haltl speed.' This operation takes place as follows: lll/hen the master controller has been moved to the third speedv the contact bars 107 and'108 Will be moved into contact with the contact fingers 109 and 110, respectively. The master controller havingfbeen lirst'inoved to the second notchV the controlling circuit will. beV completed 'through the second eircuitbreaker and closer B of the main circuit as follows. The curfl rent passes -from the point 87 of the line 93 is ypassingupwardly through the line 86, as before, to I the point 85, thence upwardly through'the line 115 to the point 139 where it divides,

a part passing throu h thecircuit breaker 5 and closer 88, which action of the solenoid f, through the line llflland circuit breaker and closer 99, line 113, circuit breaker and closer 95, line 112 to the solenoid b, line 111 to the finger 109 of l the master controller and thence through the contact bars 76 and 74, finger 77 to the line 71' at 72 and thence to the negative side of th line at 73, thus closing the circuit through the solenoid I) and actuating the same to r close the circuit breaker and closer` B and to open that circuit`breaker and closer. 84 of the line 83 which is connected with the solenoid'. As stated, the circuit divides at the point 139, a part passing to the right through the circuit breaker which has been closed by'the action of the solenoid g, through the line 140 to the point 141, thence4 through the line 142-to the point y 143 of the line 83, thence through the solenoids f and g to the line 80 and the master controller as before described, thereby maintaining the circuit breakersand closers F a'nd G closed. The circuit breaker and closer B of the main lineA having beenclosed by the action of the solenoid Zi permits the current to pass from the circuit breaker and closer A through line 116 to the circuit breaker and closer B, thence Vline 117, through the solenoid 118 of the circuit breaker and closer 119, through the line 120 to the second section of resistance, vR', thence through the line 97, circuit 4 Jbreaker and closer G, armature 102, circuit V breaker and closer F, field magnets 105 to 40 the negative side of the line, thus cutting out of the power circuit the first section of resistance, R. l

The movement of the master controller X to -the third notch brings the contact bar 108 into contact with the finger 110 and closes the third controlling circuit to actuate the solenoid c to close the circuit breaker and closer C, the circuit tracing in the same manner as in the case of' the circuit'breaker and closer B, and to cut out a second section of resistance, R2, The circuit breakers and closers B, C, D and E are Y,closed successively in this manner until all the resistance has been cut out and the main circuit is connected directly from the circuit breaker and closer4 E to line 97 at 121.. It

will be; oticed that after passing through each of the circuit breakers A, B, C, D and E the power circuit Will pass through the solenoid 118 of a magnetically operating circuit breaker and closer '119 which is located in the controlling circuit of thc next succeeding circuit breaker and closer inthe main line. The circuitbreakers and closers for the controlling circuitsare so adjusted as been closed by the and closer 89, y

through the as to be inoperative under Vn ormal current, but, when one of the main circuit breakers and closers is first closed, the current pass-- ing through the line is excessive and is sufficient to energize the solenoid of the circuit breaker and closer in the next successive controlling circuit and break that circuit. So long as this controlling circuit is broken the next succeeding circuit breaker and closer of the main line cannot be closed, re ardle'ss of the position of the master control er. As soon as the'motor has adjusted .itself to the increased current the solenoid of the circuit breaker and closer in the controlling circuit will be denergized and the circuit again cloed, thus enabling the next circuit breaker and closer in the main line to respond to the. i

movement ofthe master controller. B means of this controlling mechanism lit Wi l be apparent that even should the master controller be thrown on full speed at one movement, the resistance will be cut out gradually, as the motor acquires speed.

Should the excavating dipper strike an immovable or solidly embedded rock or meetl with otherresistance of an unusual character the motors will rapidly build up toward the danger point. In order to maintain'a con? tinuous pressure ork pull on the dipperand yet'avoid the danger of burnin out the mot'ors we have provided means or cutting in a part of the resistance become abnormal. breaker and closer 99 located in the controllin circuit for the main line'circu'it breaker an closer B has the coil of its solenoid oonnectedinto the main power circuit beyond when the current'has' 'To this end thecircuit'v the last circuit breaker and closer E ofthe main line. This solenoid is adjusted to oper# ate ,only `when the current in the motor reaches the vdanger point. When the current reaches this point the circuit breaker and closer 99 is opened, thus breaking the' controlling circuit for the main line circuit breaker and'closer Band allowing that 4circuit' breaker and closer to open, therebybreaking the main circuit at that point and forcing the current to 'pass from the first -circuit breaker and closerA of the main line I through the line 93, circuit breaker and closer 94-95 and line 99 to the first section of resistance R and through all the resist-l ance to the motor. This excessive current operates the circuit breaker and closer` 95 to oph the controlling circuit of the circuitv breaker and closer B and maintain the same open after the circuit breaker and closer 99 may have closed. Thus', the main line circuit breaker and closer B cannot again close until the current"has been reduced to normal controlling circuit112-113 closed, thus pervmitting the motor to again build up'in the 1.25v and the circuit breaker and closer 95 of the eten-5c i such as .the Yfailure ci. some part of the controlling mechanism to operate, We have provided the overloadcircuit breakerl and closer 67-91, shown in detail in Fig. 6.' The solenoid 91 of this circuit breaker and closer is adjusted to be actuated only by an abnormal current, and, when so actuated, Will raise the hinged' Contact arm 67 and break the controlling circuit for the circuit breaker and closer A. of the main line, thus cutting out the current entirely from the mo tor. The controlling current for this circuit breaker and closer A divides at the point 122, before it reaches the contact inger 67, and passes through a coil 123, through the resistance 121i, line 125 to the contact linger 79 of the master controller, thence through the Contact bars 7 6-74 and iinger 77l to the line 71at the 'point 72, thence upwardly to the negative side of the main circuit at 7 3, thus maintaining a closed circuit through the coil 123 so long as the master controller stands on or beyond the first notch. This current is-suilicient to hold the overload circuit breaker and closer 'in its o en position, after it has been once actuate and before this overload circuit breaker and closer can be again closed the master controller must be moved to zero to break the circuit through the coil 123.

We have so far described vthe action of the controlling mechanism when the controller handle is turned to the left, and it will be understood that, when the handle is turned to the right, the controlling circuit will be closed through the solenoids circuit breakers and ciosers-H and I closed, thus completinghthe circuit through the armature 102 in t e direction opposite to that heretofore described. Otherwise, the opera, tion is `the saine. It will also be obvious that the amount ot1 resistance and the num vber of circuit breakers and closures interposed in the main line may be varied ac cording to existing conditions and the requirernents ci' the machine to which the mechanism is tol be applied. The detail con struction of 'this controlling mechanism does not form a part of our invention and we have, therefore, described the same only in a general Way, suiiicient, however,to enable its operation and the manner in which it is combined with the excavating mechanism to be understood. In applying the controlling mechanisms to the motors described in connection with the excavatingmechanisun eachccntrolling mechanism is arranged entirely separate vtroni the other coutroliing mechanism and the circuit breakers and closers are mounted on plates 126 ci nonoonducting mater-iai and the resistance, which is put un in the usual manner, mounted in the rear ci the supporting plates 126, as shown at 127. The main circuit breaker t3 is arranged near the front h and i and the tion, and it will be apparent that the clos-- ing of the service switch G3 serves to close the circuit breaker and closer A ofthe main circuit and that, as soon as the master controller has been actuated to close the controlling circuit through the solenoids f and g and thus close the switches F and Gr, the.

circuit will be completed through all the vresist-ances and through the motor, starting the machine at the lowest speed; that, as the 'master controller is advanced notch by notch, the circuit breakers and closers for the main line are successively actuated and lthe actuation of each successive circuit breaker and closer cuts out an additional amount of resistance until, when the circuit breakerl and closer E has been closed, the entire resistance'will have been cut out' and the motor will be running at full speed. it

will also be apparent that, if .the master.

controller be rapidi advanced from notch to notch, the controlling mechanism Willautomaticaily revent the operation ci' the succeeding circuit breaker and closer for the main circuit until the motor has adjusted itself amount of current; that, shouid the excavating mechanism or other part ci the machinery meet 'with abnormal resistance, such as to cause-the motor to build. up very rapidly,`the controlling circuit lll, 112, 113

vand iiiffor the circult bre-alter and einserv B in the main circuit will be broken, thus causing the main circuit to be broken at l5, and in this lnanner cutting in again aii the resistance, and allowing the motor either to continue its operation at a iower rate of speed or to come tc a standstili, but mainu taining a constant torque in the motor and causing the saine to exert a continuous pull or pressure upon the excavating member;` that, by means of this controlling mechan-v ism the amount of current admitted to the motor is regulated by the movement of tbd excavating member or dippcr, thereby air i tomatlcally regulating the amount oit current admitted to the motor under various operating conditions, as when the' excavating member or flipper encounters an obstruction or an excessive resistance to its movement; that, should the current become excessive for any reason, .such as the failure ct some part o the controliing-niechanism to operate, the'main circuit will be automatically broken and the curr nt cut out of the motor entirely g. and that it willi necesto receive the additional' ics e esente l sary to return the master controller to zero before the circuit can again be completed. through :the motor. It will also be apparent that We have provided an electrical driving mechanism for an excavating machine which can be readily substituted for the or dinary steam driving mechanism of a steam driven excavating machine; that the driving mechanism is so arranged as to occupy a minimum amount of space and is arranged in such a manner as to secure the highest degree of efficiency; that the controlling mechanism and the resistance are arranged in the rear of the motors where they will he out of the Way; and that the whole construction and arrangement is such as to distribute the weight to the best possible advantage.

As above stated, we do not claim as our invention the specific electrical mechanism herein shown and described, but we do claim to be the first to have provided a power ex cavating machine with electric driving mechanism; and to so control this mechanism from the excavating mechanism that the motors will exert a continuous pull against a fixed resistance, that is, if tlfe excavating member or dipper meets with an excessive amount of resistanceto its movement, the motor will be allowed to build up to a predeterminedpoint only and then resistance will be cut into the circuit in suiiicient qualitities to materially reduce the amount of current admitted to the motors, but to permit the motors lto continue their operation at a lower rate vof speed, or vto come to a tempo rary stop, and to maintain a constant: torque in the motor, thus exerting a continuous pull or pressure upon the excavating member.

lVhilc we have particularly described the cont-rolling means for the hoisting mechanism, it will be understood that this same con` trolling'means is. applied, with but slight' modifications, to both the swinging mechanism and the crowding mechanism and these modifications are of such a minor character that it is unnecessary to herein describe the same. The controlling means abovey described in connection with the hoisting mechanism is of particular value in connection with the crowding mechanism in that it is in this crowding mechanism that it is more often desirable to cause the clipper toJexert a Steady, continuous pull againstv the work, even though the resistance offered to the dipper may be such as to entirely prevent its' movement. When such resistance is offered 'to the dipper the current admitted to the motor is so controlled that a continuous torque is kept up in the motor, which is suiiicient to move the motor at a low rate of speed, but is not suiiicient to damage the motor should the armature come Ato a temporary stop, as, when the dipper strikes a ledge of rock.

The mechanism herein shown and described is chosen for the purpose of illustration onlyand-it will be obvious that many changes might be made therein, and We, therefore, Wish it to be understood tha-t We do not desire to be limited to the details of construction shown and described, for 'obvious modifications Will occur to a person skilled in the art.

Having thus fully described our invention, what we claim as vnew and desire to secure by Letters Patent, is r l. In anexcavating machine, the combination, with an excavating member, a motor for actuating said excavatin member, a motor circuit, and a master-controller for said circuit, of means controlled b said excavatingmember for cutting resistance into said circuit, and meansto prevent the cutting out of the resistancerfrom said circuit before said master-conti'oller has been moved to zero. y f

2. In an excavating machine, the combination, with an excavating member having a plurality of movements, of a separate motor for imparting each of said movements to 'said excavating member, independent automatic controlling mechanism for each of said motors, an independent `master controller for each of said motors, `smid master 4controllers being grouped about a common point and arranged within reach of the operator from a single position.

3. In an excavating machine, the combination, with a frame, and an excavating member, of a Ashaft arranged transversely Vto said frame, means for operatively connecting said shaft to said excavating member, gears mounted on said shaft near the opposite ends thereof,other shafts arranged near the opposite sides of said frame, pinions mounted on said other shafts and meshing with the respective gears on said firstanentioned shaft, and means for actuating the last-mentioned shafts in unison.

et. In an excavating machine, the combination, with a frame, and an excavating member, of a shaft arranged transversely to said frame, means for operatively connecting said shaft to said excavating mem ber, gears mounted on vsaid shaft near the opposite ends thereof, a shaft arran 'ed near each side of said frame and extending longitudinally thereto, pinions mounted on said longitudinal shafts and: meshing with said gears, an electric motor connected to each of said longitudinal shafts, and means for controlling said motors in common.

5. ln an excavating machine, the combination, with a frame, andan excavating member, of a shaft arranged transversely to said frame', means for operatively con- -necting said shaft to said excavating member., gears .mounted on said shaft near the opposite endsthereof, a shaft arranged near each side olf said 'frame and extending longil to the shaft of .fsaid hoissting-drn1n, and a tudinally thereto, pinions mounted on saitl longitudinal Shafts and n'ieehingr with said gears, on eloetrifmotor connected to each of said longitudinal shafts, means -for rox:- trolling snitl motore inl Common, o eee-ond transvorf-ie Shaft arranged in the rear oll the 4tiret-mentioneil tran.-s\'erse shaft, means i'or operatively,Y Connecting said seemnl transA verse shaft to said exicavating member, an elet-trie motor'- arranged between said longr tndinal shafls anl ope 'atirely connected to :said seronrl transvezse shaft, an l moans lor controlling saairl motor independently of the. first-mentioned motors.

(3. ln on excavating machine, the Combination, with a main frame, an excavating member, a nhaft, anti a` (lrlnn mounted on salti shaft. all ol Standard design, of a Supporting fragile znlapiell to be removably mount-eil nin/1n aanl main lralne ai'nl support said shaft, n motor mounted on said main frame in the rear of ,miirl Supporting frame,

and menne for operatively Connecting said motor to said shaft. i

7. In an excavating maohin. the combi nntiomwitii a main iframe, ano an ema-Yatw ing member, of a hoisting-drinn mounted on said main frame, a Swinging-ordm mounted on said moin frame in the rear of Said hoif'sting'felrnm, motor mounted` on Said moin lframe in the rear of vsaid swingingdrnm and operatively oonneoted' thereto, another motor mounted on Said moin frame inthe rear of said swinging-drinn, and means for operatively connecting said laestmentioned motor to said hoistingdrnm.

8. ln an excavating machine, the combination, with a-niain iframe, and-an. eXCavat ing lnenllxer. of a' ,shaft arranged transversely to mild main frame, a hoisting-drinn mounted on said lishalft, a seeonl shaft mounted on sai@ main raine swingingilrnm mounted on ,Qzrirlvsecontl shaft, n motor arrangeol Hr-of said Swinging-drum anfl operatively connecteti to said seeonfl Shaft, longitudinal Shafts arranged on each sitle of said motor, operatively connected to said lirst-mentioi1etl Shaft angl extending to points in the rear of Said motor, and o motor connected to each of said longii'zinlinal shafts.

9. ln an excavating machine, the eoniloinotion, with a main frame, and an excavating member, o shaft, a hoistingalrnm monniefl on Hariri shaft, a supporting frame mounted on said main frame in the rear of sont shaft., a. swinging-drinn mounted on saiel supportingrmne in a piane above the rSv-- inentiones shaft, a motor mounted on main from@ in the rear of sind supporting, frame and operatively connected. to sani V S\\'inging-cl1'um, longitudinal shafts mount ed on said main frame on each side of said suppertingyrmne and; operatively eoim'eeedV motor connertefl to each of Said longitntlinal shafts.

10. ln an excavating machine, the oomlnnatlon, with n mann frame, and an excavating member, of a sli-rift, o hoisting-drinn `mounted on Sani. shaft, a supporting-frame n nmntecl on s-:aid main 'frame in the rearof Sani sha't't, a mvingingdrum mounted on said su1porting-frame in a plane ahovethe first-mentioned, shaft, motor mounted vin saitl main frame in the rear of Said supportingg-lirarne anti opera-tively connected to said swinging-(kuni, longitudinal Shafts in0unt ed on Said main frame on eaoli side of said elimiorting-frame and operatively eonneotetl to the sha't of said hoisting-drum, a motor connected toeaeh of said longitudinal shafts, and autoina'iio controlling mechanism for all o'l said niotors mounted on the main frame in the rear of the laei-me'nt-ione@` motor.

l1. ln an excavating machine, a main frame, ay boom' movably mounted near the forward enti of Said frame, and an excavating' flipper Carried hy Said boom, hoisting and swinging drums inounte on said main frame in the rear of Saitloooni, elec-trio motors mounted on said main frame in the rear of Said drinne and operatively connected to saiti hoisting,l and f5 inging drome, respectively, and controlling mechanism for Said motors Supported on said frame in the rear of said motors.

lf3. in anV excavating nio-chine, a main iframe, a boom mounted at the 'forwarfl end thereof, an excavating clipper carried hy ,Sani boom, hoisting (lrun'i mounted on seni moin frame in the reni: of Sani boom, e shaftrolal'ahly mounted on Said main 'frame in the rear of said hoisting drinn and operotively connected thereto, bevel gears carried by the opposite.v ends of seid shaft, longitudinally arranged shorts supported near the opposite sides of emol ro. 'n rame, e bevel pinion secured to the forward enel of 'each of sani shafts an-fl inee'iing with 'the respective bevel gears, an eleetriomotor operatively eonneetecl to the rear enel of each of said Shafts, a removable supporting' from@ mounted on seid moin frame in the rear o'lsaid hoisting drum intl between Sol longitudinal shafts, o swinging drum meer totaly mounted on solei supporting frame, en eleetrio meier supported on seid. main frame in the rear ol" said Supporting 'iframe enelv tween swirl longitntlinal shaft@ and operetively connected to Said si, inging clrnin, automatic controlling; mechanism for Said motors mounted. on said main "freine nein." the rear end thereof, and master controllers for said motors supported neaiilie forward end of said main treme.

13. n an exeorating machine, the VJomhinotion, with. boom, enel o irper mount- CBG ed thereon and movable relatively thereto,

of an electric motor mounted on said boom and operatively connected to said dpper, and means'controlled by the movement of lseid clipper for cutting out a part only of rthe current from said motor.

'14. In anzexcavathin machine, the combination, Wit-h' a bo yportion, a shaft mounted thereon, means for rotating said shaft, a drum mounted on said shaft, frio.v

tion clutch mechanismv for connecting said drum to s aid sha-ft, and a power cylinder for actuating said clutch mechanism, ofan air compressor mounted on lsaid body portion and connected with said power cylinder, and v15 GEORGE W. KING. HARRY J. BARNHART. CHARLES B. KING.

i Witnesses:

'W. R. WADDELL, C. M; WRIGHT.

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