US1200515A

US1200515A - Gearing for mining-machines.

Info

Publication number: US1200515A
Application number: US74725113A
Authority: US
Inventors: Edmund C Morgan
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-02-10
Filing date: 1913-02-10
Publication date: 1916-10-10
Anticipated expiration: 1933-10-10

Description

E. C. MORGAN.

GEARENG FOR MINING MACHINES.

APPLICATION FILED FEB.i0,1-9I3- Patented Oct. 10, 1916.

4 SHEETSSHEET I.

E. C. MORGAN.

GEARING FOR MINING MACHINES.

APPLICATION FILED FEB. 10, 1943.

1 ,2005 1 5 Pafented Oct; 10, 1916.

4 SHEETSSHEET 2.

E. C MORGAN.

GEARING FOR MINING MACHINES.

APPLICATION man r EB. 10. I913.

Pafefited Oct. 10, 1916.

n" Ww JJ 4 SHEETS-SHEET 3.

l QQ mr mwms ran-Rs m. PHOTD urmz. In m'GmN, n. cy

E. C. MORGAN.

GEARING FOR MINING MACHINES.

' APPLICATION FILED FEB.10,19|3. L20Q515. Patented Oct. 10, 1916.

4 SHEETS-SHEET 44 ms NnHRls Perms no.4 Plmm Lmmu WASNINGYON, n, c

EDMUND c. MORGAN, or CHICAGO, ILLInoIs.

GEARING FOB, MINING-MACHINES.

Specification of Letters Patent.

Patented Oct. 10, 1916'.

Application filed February 10, 1913. Serial No. 747,251.

Chicago, in the county of Cook and State of and useful Im- Illinois, have invented new Mlnmg-Maprovements in Gearing for chines, of which the following is a specification.

My invention relates to mining machines of the breast type capable of being carried on a truck and slidable off the same onto the floor of the mine and to various places Where needed.

One of the objects of the invention is the provision of a machine of the type set forth which shall be improved in construction and in efficiency of operation; a further object of the invention is the provision of improved driving connections between the source of power on the mining machine, and the truck .wheels.

Other objects of the invention will appearhereinafter, the novel combinations of elements being set forth in the appended claims.

Referring to the accompanying drawings, Figure 1 represents an elevational view of my improved mining machine mounted on a truckyFig. 2 is a rear view of Fig. 1; Fig. 3 is a plan view of the mining machine;

Fig. 4 is a sectional elevation on line 4 4 ofv Fig. 3 looking in the direction of the arrows;

Fig. 5 is a sectional view of a part of Fig. 4

taken on the line 5-5 looking in the direction of the arrows; Fig. 6 is a detailed view taken on the line 66 of Fig. 4: showing certain guideways; Fig. '7 is a view of the rear jack of the mining machine; and Fig. 8 is a sectional view of the speed changing and shifting gearing shown at the left hand portion of Fig. 4.

In Fig. 1 the main frame 1 is shown as provided with a flat bottom in position for transportation on the platform 2 of the truck which is provided with wheels 3 resting on the rails at. By referring to Fig. 4 it will be seen that the mining machine is in such position on the platform 2 of the truck that an opening in the lower rear portion of the main frame 1 of the mining machine is di rectly over the vertically slidable clutch rod 5. This clutch rod or coupling pin is preferably square in cross section and extends through a corresponding opening in the center of the beveled gear wheel 6 which is in mesh with another bevel gear 7 mounted on a shaft 8. The s aft 8 is journaled in a bearing in the support or bracket 9 fastened to the lower side of the platform 2 of the truck. At the opposite end of the shaft 8 is connected another bevel gear 10 which is in mesh with the bevel gear 11, the latter being keyed to the axle 12 as more clearly shown in Fig. 2. A'bevel gear 13 also meshes with the bevel gear 11 and is keyed to a shaft 1 L journaled near one end in the bracket 15 which is fastened to the lower side of the platform 2. The shaft 14 is intended for connection to another set of bevel gears similar to those designated 10 and 11 and similarly located with respect to the forward axle of the truck.

.Attached to the lower side of the platform 2 is another bracket 16 in which is journaled the hub portion 17 of the bevel gear 6. A short hub portion 18 of the bevel gear 6 extends through a circular opening in the platform 2 of the truck but its upper surface is preferably flush with the surface of the platform and when the clutch member 5 is in its lowermost position as indicated in Fig. 4 its upper end does not extend above the upper surface of the platform 2. The mining machine may therefore be moved about on the platform 2 without meeting any obstruction so far as the hub 18 and the clutch member 5 are concerned.

A bell-crank lever 19 is pivoted to the bracket 16 and extends under the clutch pin 5 and supports the same in the position indicated in Fig. 4. Preferably, the lower arm of the bell-crank lever 19 is provided with an opening or hole 20 through which extends a pin 21 having an enlargement 22 at its lowerend. With this construction the bellcrank lever hasfreedom of movement while the pin 5 remains vertical. The upper portion of the enlargement 22 and the lower end of the coupling pin 5 are hemispherical in form so as to minimize friction and facilitate the manual actuation of the coupling pin 5. The bell-crank lever 19 is provided with a handle 23 for manual operation. The handleis also provided with spring-pressed latch mechanism 2% comprising a pin 25 which fits into various notches in the disk 26. This disk is rigidly connected to the bracket 16. Therefore, when the handle 23 is moved downwardly after the latch mechanism is operated to release the pin 25 from a notch in the disk 26 the lower arm of the bell-crank will be moved upwardly and the latch mechanism may be depended upon to hold the bell-crank in its new position.

When the mining machine is moved onto the truck and brought into the position where the opening 27 in its fiat bottom is directly over the clutch pin 5, as may be determined by suitable stops or guideways on the truck for the main frame of the mining machine, the clutch pin 5 may be thrown into the socket 28 which is of a cross section to correspond with the cross section of the clutch pin 5. lVhen the motor on the mining machine is operated to rotate the vertical shaft 29 power will be transmitted to the clutch pin 5 since the socket 28 is in the lower end of the vertical shaft 29. This of course will rotate the bevel gearing on the lower side of the platform 2 of the truck and transmit motion to the truck wheels which will effect the movement of the truck and the mining machine on the rails 4 to or from the place of mining.

The mining machine comprises a main frame 1 and a supplemental frame 30. The supplemental frame is supported byand slidable on the main frame as shown in Fig. 2. Shoes 31, extending laterally from the supplemental frame 30 rest on the upper surfaces of the gnideways 32, 32 and the flanges 33, 33 on the shoes 31, 31 prevent the supplemental frame from moving off the tracks. The guideways or tracks 32, 32 comprise vertical plates 34, 34 which extend along the upper lateral portions of the main frame and are securely fastened thereto by any suitable means. The tracks or guideways 32, 32 being connected rigidly to the main frame 1 in reality constitute a part thereof.

On the under sides of the tracks 32, 32 are longitudinal racks 35, 35 with which mesh the

gear wheels

36, 36 which are keyed to the shaft 37 (Fig. 3). Also keyed to this shaft is an intermediate worm wheel 38 which meshes with the worm 39 (Fig. 4). The worm 39 is keyed to the lower end of the auxiliary shaft 40, the upper end 41 of which is of an enlarged diameter. The auxiliary shaft 40 is 'journaled in the bracket 42 of the supplemental frame. Just beneath the enlarged portion 41 is a gear wheel 43 which rests on the bracket 42 and the upper end of which is provided with clutch teeth. It will therefore be seen that the bracket 42 supports the gear 43 which in turn supports the auxiliary vertical shaft 40 by reason of the enlarged portion 41 resting on the upper end of the gear 43. The gear 43 is not keyed to the shaft 40 but is free to rotate thereon. The clutch member 44, however, is splined to the enlarged portion 41 in that a key and keyway are provided between the parts mentioned so that the clutch member 44 is free to slide vertically but must rotate with the shaft 40.

An electric motor 45 is mounted verti: cally in a supplemental frame 30 as shown in Fig. 4 and the lower end portion of the motor shaft is provided with a gear 46 which meshes with a large gear 47. This large gear is keyed to the main vertical shaft 29, the upper end of which is provided with a pinion 48 which meshes with the internal annular gear 49. This annular gear is in the shape of an inverted cup having its upper side closed and the lower side open. The upper end of the auxiliary vertical shaft 40 is journaled in a sleeve 50 extending upwardly from the annular gear member 49. This sleeve or hub 50 is in turn journaled in the bracket 51 which extends rearwardlv from the upper portion of the supplemental frame 30.

The main vertical shaft 29 has its lower end journaled in the bracket 52 which extends rearwardly from the lower portion of the supplemental frame. The vertical shaft 29 is also j ournaled intermediate its ends in a bracket 42 and near its upper end in the bracket 53. The vertical shaft 29 and the gears thereon may therefore be supported vertically by means of all three of the

brackets

52, 42 and 53, or by any one or two of them.

Above the bracket 42 is a gear 54 which is keyed to the shaft 29 and meshes with the loose gear 43 which is on the vertical shaft 40. The upper end of the clutch member 44 is provided with clutch teeth which are capable of engaging in corresponding clutch teeth at the central portion of the annular gear member 49. The clutch member 44 is provided with an annular groove 55 into which extend the forked arms 56 which are connected to the rock shaft 57 as shown in Fig. 3. The rock shaft 57 is connected to the manual lever 58.

59 designates a controller box for the electric motor, and 60 designates a manual lever for, operating the controller box to start,

stop and reverse the electric motor 45.

The operation of the mechanism thus far described as being mounted upon a supplemental frame will now be set forth.

When the lever 60 is actuated to start the electric motor 45, the pinion 46 will transmit motion to the large gear 47 which in turn will rotate the shaft 29 together with the pinion 48 at the upper end thereof and the intermediate gear 54 (see Figs. 4 and 8). If at this time the clutch member 44 is in its central position as illustrated in Fig. 8 the annular gear member 49 will be simply rotated in its bearings without further effect since it is loosely mounted on the upper end of the shaft 40, and the gear 43 will also be freely rotated without further effect because not keyed or splined to the vertical shaft 40. When the lever 58 is lifted however, and motion transmitted to the rock shaft 57, the yoke 56 will move the clutch member 44 upwardly into engagement with the teeth on,

the under side of the annular gear member 49. Since the clutch member 44 is splined to the shaft 40 the latter will be rotated which will efiect the rotation of the worm 39. This in turn will rotate the worm wheel 38 which is in mesh with the worm 39 as shown in Fig. 3; and since the worm wheel 38 is rigidly attached to the shaft 37 the latter will be rotated in its

bearing

61,61 which in turn will rotate the

gear wheels

36, 36 which are in mesh with the racks 35, 35. The racks 35, 35 being fixed rigidly to the main frame 1 will cause the supplemental frame to be moved on the tracks 32, 32 when the

pinions

36, 36 are rotated.

The gearing is such that when the clutch member 44 is moved upwardly and the electric motor is operated in the proper direction the supplemental frame will be moved forward very slowly. On account of the pinion 46 being in mesh with a much larger gear 47 the motor may be of comparatively high speed and able to transmit considerable power to the shaft 29. A further reduction in the speed is made because of the comparatively small pinion 48 being in mesh with the large annular gear 49. The relation between the worm 39 and the worm wheel 38 may also be such that the rotation of the shaft 37 is still further reduced in speed, and the

gear wheels

36, 36 may be as small as is consistent with proper strength and wear. Therefore as before stated when the electric motor is started in the proper direction and the lever 58 is lifted the shaft 29 will be slowly rotated and this will effect the still slower rotation of the vertical shaft 40 which in turn will efiect the still slower rotation of the shaft 37 and a consequent slow feeding forward of the supplemental frame with a sliding motion on the main frame, the rear portion of the supplemental frame being supported on the main frame by the shoes 31, 31 resting on the tracks 32, 32 and kept in proper position by the depending flanges 33, 33.

It has been explained that when the lever 58 is moved upwardly and the motor is operated in the proper direction the supplemental frame will be fed forward very slowly. Now in order to retract the supplemental frame quickly the lever 58 is moved downward whereupon the clutch member 44 will engage the clutch teeth on the upper end of the gear 43, and motion will be transmitted to the shaft 40 directly from themtermediate gear 54. It will be noticed that the gear 54 is considerably larger than the pinion 43 and that the gear 43 is much smaller than the annular gear member 49. Therefore when the shaft 29 is rotated in the same direction as before, the shaft 40 will be rotated much more quickly and in the reversed direction. This will effect a reversal of the rotation of the

gears

36, 36 and consequently the supplemental frame will be moved rearwardly with a quick motion. It will-be observed that since the gears 54, 43

arev arranged for reverse rotation of theshaft 40 the controller box 59 for the elec-. tric motor need not include any reversing mechanism. It would be necessary only to connect up the motor so as to rotate in such a direction that when the clutch member 44 is moved upwardly the supplemental frame will be shifted forward with a very slow movement. Then when the motor is again started in the same direction as before and the clutch member 44 is moved downwardly the vertical shaft 40 will be rotated in the opposite direction quickly and the supplemental frame retracted or moved back to its initial position with a quick motion. This initial position will be the point where the socket 28 at the lower end of the vertical shaft 29 will register with the opening 27 in the bottom of the main frame 1 whereupon the lever 58 is moved to central position thereby stopping the movement ofthe supplemental frame. The motor may continue in operation however and therefore when the lever 23 is grasped and moved downwardly, the clutch pin 5 may be moved upwardly to effect the operation of the gearing of the truck to move the latter to some other location. Of course when it is vdesired to move the truck in either direction on the rails 4 the electric motor should be provided with reversing mechanism.

Preferably the main frame is provided with limit stops 62, 62 which in this instance are shown on Fig. '1 extending laterally from the vertical side plate of the guide rails. When the supplemental frame moves forwardly and reaches the point where it should stop the depending arm 63 connected to the rock shaft 57 will strike the limit stop 62 and move the lever 58 back to central position. The yoke 56 together with the clutch member 44 will also be moved back to central position and the rotation of the shaft 40 will cease and therefore the forward motion of the supplemental frame will discontinue. When the supplemental frame is being moved rearwardly, in

which case the lever 58 and the yoke 56 are down, the arm 63 will strike the limit stop 62, and the clutch 44 will be moved back cally, the upper end of the shaft being journaled in the ball bearings 63, and the lower end of the shaft being mounted on the step bearing 64, although a part of the vertical thrust may be taken by the lower surface of the pinion 46 resting on the bearing which may be integral with the supplemental frame. I prefer, however, toconnect to the lower side of the supplemental frame 30, the casting 66' which comprises the bracket arm 52 and the oil well 67, the latter being provided with a hinged cover 68. Upon opening the hinged cover 68 oil may be in troduced into the oil well 67, which will find its way through the passage 69 to and around the lower section 70 of the vertical motor shaft and upwardly to the bearings 65; also downwardly to the step bearing 64. Another passage 71 is provided in the bracket 52 so that the oil may find its way to the bearing for the lower end of the shaft 29.

I will now describe the chain cutter frame and the means for supporting same.

Extending longitudinally of the mining machine between the forward end of the supplemental frame and the outer end of the main frame is a pair of angle irons 72, 72. The casting 66 is made of peculiar shape because its forward portion is provided with depending guide members 73, 73 which confine the vertical portion of the angle iron 72, 72' as indicated in Fig. 5. Support is also afforded for the angle irons 72, 72 by the lower lateral extensions 74, 74 from the casting 66. The angle irons 72, 72 therefore have freedom of longitudinal sliding movement but are confined otherwise. The usual position of the rear ends of the angle irons 72, 72 is indicated by the vertical dotted lines in Figs. 3 and 4. The vertical dotted line 76, however, in Fig. 4 represents the position of the rear ends of the cutter frame 77, 77 which is better illustrated in Fig. 3. The rear ends of the angle irons 72, 72 being slidably supported on suitable depending brackets from the casing 66, the forward ends of the angle irons 72 are also slidably supported in

lateiul guideways

78, 78 on the forward shoe 79 as shown in Fig. 6. This forward shoe is a frame which extends across the main frame of the mining machine at its outer end, being rigidly fastened to the outer ends of the vertical plates 34, 34 as shown in Fig. 2. The extension 80 of the shoe 79 may be such as that indicated in Fig. 4, and may be of comparatively narrow width at its lower portion, as shown in Fig. 6, the upper portion being as indicated in Fig. 3. It will now be seen that the angle irons 72, 72 straddle the central lower portion of the shoe 79. The shoe 79 affords a forward support for the main frame of the mining machine.

The chain cutter frames 77, 77 may be-of the cross section shown in Fig. 5, so as to properly hold the cutter chain 81 in proper position. The chain cutter comprises also the sockets 82, the cutters 83 and the set screws 84 for holding the cutters in adjusted position. It should be understood that the chain cutter frame is supported by the angle irons 72, 72. This will be evident from Fig. 3 from which it will be seen that the chain passes around the outer transverse frame 85, in the corners of which are pivoted the

sprocket wheels

86, 86 for properly directing the cutter chain. Rigidly connected to the transverse frame are the rearwardly extending guides 87, 87 which rest in the angular lateral recesses of the angle irons 72. The guides 87 in turn are rigidly connected by the

plates

88, 88 to the lateral chain cutter frames 77 77. It will thus be seen that the forward transverse frame 85, the central guides 87, S7 and the lateral cutter chain frames 77, 7 7 constitute one rigid structure which is guided in its forward and backward movement by the angle irons 72, 72. This structure is clearly indicated in Fig. 3 and by comparing that figure with Figs. 4 and 6 it will be seen that the entire chain cutter frame is below the upper portion of the shoe 79.

As'before explained, the angle irons 72, 72 may have a longitudinal sliding motion, but if desired, they may be connected rigidly in position between the depending bracket and the casting 66 which is fastened to the supplemental frame 30, and the lower central portion of the shoe 7 9. In order to adjust the tension of the cutter chain, the guide blocks 89, 89 are connected rigidly to the lateral chain cutter frame 77, 77 and screw threaded rods 90, 90 are extended through these guide blocks longitudinally of the angle irons 7 2, 72 and provided with adjusting nuts 91, 91, and 92, 92. These longitudinal screw threaded rods are provided at their rear ends with squared extensions 93, 93 which fit into corresponding recesses 94 as indicated in Fig. 4, and in Fig. 5. Now by loosening the nuts 91, 91 and tightening up the nuts 92, 92, the entire chain cutter frame including the forward transverse frame 85, and the guides 87', 87, may be moved rearwardly to lessen the tension of the cutter chain or permit its removal or repair. Vhen the nuts 92 are loosened, and the nuts 91 tightened up, the entire cutter chain frame may be moved outwardly to increase the tension on the chain. When the chain frame is in adjusted position both pairs of nuts may be tightened so as to lock the chain frame in adjusted position.

The driving sprocket 95, for the cutter chain is mounted on the lower portion of the vertical shaft 29 on the bracket 52. A coupling pin 96 may be depended upon to conmet the large gear wheel 4-7 with the and when the pin 5 is sprocket 95. 'By taking out the coupling pin 96, the supplemental frame may be moved back to initial position without at the same time operating the chain cutter. The truck may also be moved from place to place without operating the chain cutter.

I will now describe the rear and forward jacks for properly bracing the machine while the cutter is operating.

The rear jack comprises a U-shaped cross piece 97, which is bolted at 98, 98 to the rear end of the main frame 1. The central portion of the cross piece 97 is provided with three radiating sockets, each of which is square in cross section, as shown at 99 in Fig. 1. The squared lower end of the screw threaded rod 100 may be placed in any one of these sockets and the wheel 101, then turned on the screw threaded rod so as to move the sleeve 102 thereon outwardly until the pointed shoe abuts against some firm rigid material in the mine. The type of machine illustrated being such that'it is slid from place to place where mining is to be done, the mining machine will often occupy suchpositions where it will be desirable to use the rear jack in inclined positions as shown in dotted lines in Fig. 7. It should also be noted that the cross piece 97 is in reality pivoted between the rear extensions of the main frame so that the jack may be tilted to various positions and fastened in adjustable position by means of the nuts and bolts at 98, 98.

The front jack of the main frame is mounted in the shoe 7 9, between the vertical plates 103, 103 as shown in Fig. 3, and in Fig. 4. The dotted lines in the vertical plates 103, 103 of Fig. 3, indicate the position of the pivot rod 104, which is shown in section in Figs" l. On the pivot rod 101 between the vertical plates 103, 103 is mounted the screw threaded rod 105, on which is the wheel 101 carrying the sleeve 102, at the outer end of which is the pointed shoe 106.

Having described the essential features of my improved mining machine, I will now briefly review the operation thereof.

The mining machine being first the truck with the opening 27 in its bottom directly over the hub 18 of the gear wheel 6, the clutch pin 5 may be thrust upwardly, and the motor started in proper direction, seated in the socket 28, motion will be transmitted to thetruck wheels and the mining machine carried to the place in the mine where it is to be used. After taking the mining machine off the truck to the point'where the cutting is to take place, the rear and front jacks are operated to firmly hold the main frame in adjusted position. Now upon again starting the motor in the proper direction and lifting the lever 58 manually the large internal gear placed on gear,

19 will be operated and the supplemental frame together with the chain cutter frame a will be moved slowly forward to make an under cut across the mine wall. It will be observed that the rear portion of the supple mental frame is supported by the shoes 31, 31 on the tracks 32, 32, of the main frame, and that the forward portion of the supplemental frame is supported by the lower central portion of the shoe 79, in the manner lndicated 1n Fig. 5, because as there indioated, the lateral guides 7 8, 78 support the angle irons 72, 72. It will therefore be seen' that during the cutting operation the main frame including the forwardly extending tracks 32, 32, side plates 31, 34, and the forward shoe 79, all remain stationary, while the supplemental frame and the entire chain cutter frame, including the angle irons 72, 72, move slowly forward while the chain cutter is being operated. This is assuming of course that after the mining machine has been properly jacked up, the coupling pin 96 is in position and the lever 58 has been lifted after starting the electric motor in the proper direction. After the chain cutter has been moved to the limit of its movement forward the operation will be automatically stoppedby the lever arm 63 striking against the stop 62, and throwing the clutch 1a to central position. Now by reversing the clutch, without stopping the motor or changing its direction, the gear 43 may be thrown into actuation and thereby cause a quick withdrawal of the supplemental frame to initial position which prevents any waste of time in securing a new position of cutting for the machine.

It should be particularly noted that the reduction gearing shown is very compact and simple, and permits a very slow movement of the supplemental frame forwardly .and a quick movement thereof rearwardly. It will also be noted that the worm and worm wheel are connected directly to the shaft 37 which carries the gears that are meshed with the longitudinal racks, thus effecting a smoother operation because the back thrust or resistance due to irregularities in the hardness of the material being cut is taken directly by the worm and worm and not by intermediate gearing, except for the racks and pinions. The arrangement of transmission gearing between the motor and the racks permits the shaft 37 to occupy a lower position so that the power for moving the cutter frame forward will be exerted with considerable force while at the same time the mechanism is maintained in compact relation. By providing the large gear 5 1 for increased speed in reversed direction, the mechanism is maintained compact nevertheless, because the shaft 37 and the gear wheels at the outer ends thereof are located forwardly of the vertical shaft 29 in frame, longitudinal racks on said main frame, pinions meshing with said racks, a shaft for carrying said pinions, a worm wheel secured to said shaft, a worm meshing with said worm wheel, a motor, and driving connection between said motor and said worm.

2. In a mining machine, the combination with a main frame, of .a supplemental frame, an electric motor having a vertical shaft, a pinion mounted on said motor shaft, a power driven shaft parallel to said motor shaft, a large gear meshing with said pinion on the motor shaft, a small pinion at the upper end of said parallel shaft, an internal gear meshing with last named pinion, an intermediate vertical shaft, a worm at the lower end of said intermediate shaft, a transverse shaft located forwardly of said power driven shaft, a worm wheel on said transverse shaft meshing with the worm on the intermediate shaft, driving pinions at the outer ends of said transverse shaft, and racks in mesh with said last named pinions and carried by said main frame.

3. In a mining machine, the combination with a main frame, of a supplemental frame, stationary racks on said main frame, an electric motor on said supplemental frame, said electric motor having a shaft, a vertical power-driven shaft, a large gear wheel carried by said vertical power-driven shaft, a pinion on said motor shaft in mesh with said large gear wheel, mechanism associated for operation by said vertical power-driven shaft, a second gear wheel mounted on said vertical shaft, an intermediate vertical shaft, a loose gear mounted on said intermediate shaft in mesh with the second gear on said vertical power-driven shaft, a worm mounted on said intermediate shaft, a trans verse shaft located forwardly of said vertical power-driven shaft, a worm wheel on said transverse shaft and in mesh with said worm, and pinions onsaid transverse shaft meshing with the aforesaid racks on the main frame.

4. In a mining machine, the combination with a main frame, of a supplemental frame, racks on said main frame, an electric motor mounted vertically in said supplemental frame, said electric motor having a shaft, a vertical power-driven shaft, a large spur gear mounted on said vertical power-driven shaft, a pinion on said motor shaft and meshing with said large spur gear, a smallpinion at the upper end of said powerdriven shaft, a large internal gear meshing with the last named pinion, an intermediate gear of intermediate size on said vertical power-driven shaft, an intermediate vertical shaft connected to said internal gear, a small loose gear on said intermediate shaft and meshing with said intermediate gear on said power-driven shaft, a worm at the lower end of said intermediate vertical shaft, a transverse shaft forward or said vertical power-driven shaft and to the rear of said motor, a worm wheel on said transverse shaft and meshing with said worm, pinions at the outer ends of said transverse shaft and meshing with the aforesaid racks on the main frame, clutch mechanism on the intermediate vertical shaft, and manual means for operating the said clutch mechanism to transmit motion to the transverse shaft from the internal gear to effect slow forward feed of said supplemental frame, or to transmit motion to said transverse shaft from the intermediate gear on said power-driven vertical shaft and said intermediate vertical shaft to elfect quick return movement of said supplemental frame without changing the direct-ion of rotation of the motor shaft.

5. In a mining machine, the combination with a main frame, of a supplemental frame, gearing for effecting a slow forward feed of the said supplemental frame automatically, connections comprising a part of said gearing for effecting a quick return movement of said supplemental frame, a lever, yoke, and clutch for throwing in the gearing to effect slow forward movement or for throwing in the gearing to effect a quick return movement, and stops on the main frame for automatically throwing out said clutch by engaging said lever to automatically stop the forward feed of the supplemental frame when it reaches the forward limit of its movement and for automatically throwing out said clutch by engaging said -lever to automatically stop the quick rearward motion of the supplemental frame when it reaches the rear limit of its movement.

6. In a mining machine, the combination with a main frame, of a supplemental frame, a vertical driving shaft, a driven shaft parallel thereto and operatively connected to said main frame, and means comprising four gears for rotating said driven shaft slowly in one direction to effect slow forward feed of said supplemental frame and for rotating said driven shaft at a higher speed in the other direction to effect quick retraction of said supplemental frame.

7. In a mining machine, the combination with a main frame, of a supplemental frame,

a driving shaft, a driven shaft, four gears associated with .said shafts, operating connections between said driven shaft and said main frame, and means for effecting the reversal of rotation of said driven shaft and the operation thereof at diflerent speeds to secure correspondingly different rates of motion of said supplemental frame in opposite directions.

8. In a mining machine, the combination with a main frame, of a supplemental frame, a driving shaft, a driven shaft parallel thereto, two gears mounted on said driving shaft, two gears mounted on said driven shaft, operating connections between said driven shaft and said main frame, and clutch mechanism for reversing the rotation of said driven shaft and the operation thereof at different speeds by means of said four gears to effect movements of said supplemental frame at different speeds in opposite directions.

9. In a mining machine, the combination with a main frame, of a supplemental frame, a vertical driving shaft, a driven shaft, an 2. internal annular gear mounted on said driven shaft, an additional gear mounted 0 said driven shaft, operating connections between said driven shaft and said main frame, 1 gearing mounted on said driving shaft in mesh with the gearing on said driven shaft, and means for effecting the reversal of said driven shaft in its rotation at different speeds to secure movement of said supplemental frame in opposite directions at different speeds.

10. In a mining machine, the combination with a-main frame, of a supplemental frame, a driving shaft, a driven shaft parallel thereto, an internal annular gear mounted loosely on said driven shaft, a pinion meshannular gear and a ing with said internal mounted on said driving shaft for rotation therewith, an additional gear mounted said driving shaft for rotation therewith, a lil Copies of this J February,

patent may be obtained for five cents each, by addressing. the

spur gear mounted on said driven shaft and in mesh with said additional gear, a clutch on said driven shaft, operating connections between said driven shaft and said main frame, and means for operating said clutch to throw in the annular gear and pinion and effect a slow rotation of said driven shaft to secure a slow forward feeding movement of said supplemental frame, and for operating said clutch to throw in said spur gear and said additional gear to effect a reversal of said driven shaft and rotation thereof at a higher speed to effect a quick retracting movement of said supplemental frame.

11. In a mining machine, the combination with a sprocket wheel, of-adriving shaft connected to said sprocket wheel, a driven shaft, a main frame, a supplemental frame, feeding mechanism for said supplemental frame connected to said driven shaft, and means comprising four gears for feeding and reversing said supplemental frame and varying the speed of rotation of said driven shaft to secure a quick return of said supplemental frame toward initial position.

12. In a mming machine, the combination wlth a main frame, of a supplemental frame, means comprising a driven shaft for moving said supplemental frame forwardly and 1 rearwardly,

and means consisting of four gears associated with said driven shaft for effecting reversal thereof and rotation at different speeds to secure a slow forward movement of the supplemental frame and quick retraction thereof.

In testimony whereof I have signed my I name to this specification,

in the presence of two subscribing witnesses, on this 5th day of EDMUND C. MORGAN.

Witnesses:

CHAS. M. NISSEN, CHARLES H. SEEM.

Commissioner of Patents,

Washington, .D. C.