US1522768A - Power shovel - Google Patents

Description

13. ms. 152m LE R0)! P. CLUTTER ET AL POWER SHOVEL Filed May 2, 1922 4 sheetshshet' 1 am; as; 2 925. 4

* LE ROY P. QZZLUTTER ET AL POWER SHOVEL mam . 4 Sheets-Sha e; 2

Filed May 2 1922 E 5 U I: .k% w O G Y mw Vh C: V m; 2:: A.

W/E'TNESS Jan. 13, 1925- t L52276$ LE ROY P. CL UTTER ET AL POWER SHOVEL Filed May 1922 4 Sheets-Sheet 3 Mi 92 s? 5/ a2 E, 13. 1925., Lszzfifi LE ROY P. CLUTTER ET AL POWER SHOVEL Filed May 2, 1922 4 shaetsz shewt 1 machine can be positioned in whereby its operatin atented Jan. 13, 1925.

LE ROY P. CLUTTER AND BIRD C. CLUTTEB,

IPOWER Application filed May 2,

To all whom it may concern:

Be it known that we, Ln ROY P. CLU'I'I'ER and BIRD C. CLU'rrnR, citizens of the United States, residing at Uniontown, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Power Shovels, of which the following is a specification.

This invention relates to power shovels or excavators adapted to be operated by a steam or internal combustion engine, electric motor, or any other suitable driving means, and has for its primary object to provide a machine of such class which may be successfully operated in very restricted places, such as mines, tunnels, basements or in spaces impeded with poles, lines, posts etc.

A further object of the invention is to provide a machine of such class without use of a boom thus obviating the employ- 'ment of counterweights, and to further provide a verypowerful machine of the class referred to which'is comparatively light in structure and very compact.

A further object of the invention is to provide a machine of such class, in a manner as hereinafter set forth, with power scoop or shovel having an unusually high dumping elevation, as well as with a straight forward thrust,'thus making it possible to leave thebed or work with an excellent grade, as well as with square corners and vertical slopes.

A further object of the invention is to provide a machine of the class referred to, mechanism, including engine,-drums, clutc es and various other parts of such mechanism is located back of the center pin (upon which the body of the machine swings) therebyincreasing its ability to lift heavy loads, and as the employment of the ordinary boom, in such types of machines is dispensed with, it enables the voperation of the machine extremely close to the-work or excavation.

A further object of the invention is to provide a machine of the class referred to with a scoop or shovel provided with apair of rearwardly extending arms, which are adapted to be projected rom within the machine outwardly therefrom and to be withdrawn into the machine, under such conditions the close proximity to the work or excavation, and to further pivotally support said arms at their rear OF UNIONTOWN, PENNSYLVANIA SHOVEL.

1922. Serial No. 557,852.

ends whereby the arms can be shifted to anydesired inclination when projected.

Still further objects of the invention are to provide a machine of the type stated which is simple in its construction and arrangement, strong, durable and efiicient in its use, and comparatively inexpensive to manufacture. I

To the accomplishment of these and such other objects as may hereinafter appear, the invention consists of the novel construction, combination and arrangement of parts, herein specifically described and'illustrated in the accompanying drawings wherein is shown an embodiment of the invention, but it is to be understood that changes, variations and modifications may be resorted to which come within the scope of the claims hereunto appended. a

In the drawings forming a portion of this specification and wherein like numerals of reference designate corresponding parts throughout the several views:

' Figure 1 is a side elevation of a power shovel in accordance with this invention.

Figure 2 is atop plan view of the machine with parts thereof removed.

Figure 3 is an enlarged detail view of the traction and swing operating mechanisms.

Figure 4 is a rear end view of the track for the scoop arms carriage, the latter being mounted thereon. c

Figure 5' is fragmentary viewof the inner side of one of the track members.

Figure 6 is a side view of the differential housing and gearing for actuating the drums controllin the scoop movements.

Figure is a rear view of one of the drums and associated parts.

Figure 8 is a side elevation of the scoop in the closed position.

Figure 9 is a top plan View thereof.

Figure 10 is a side elevation of the scoop ina partiallyopen position.

Referring in detail tothe drawings 1 denotes the body portion ofa truck provided with front wheels 2 and rear wheels 3 of any suitable construction. A large swingl 4, horizontally disposed, is fixed to t e top of the body portion 1.

, Pivotally mounted on the truck is the frame structure of the machine, comprising a base or platform 5, vertical members 6, longitudinal top members 7, angularly disgear ' diagonally 9 and the vertical braces 10.

. ing axle 20 havin The base 5, of the frame structure, is pivotally connected with the body portion 1 of the truck and centrally of the swing gear 4, so as to permit of the frame structure being swung entirely around in either direction upon the truck. The lower face of the base 5 carries a plurality of rollers 11 which travel on a path formed 'on the swing gear 4, adjacent to its periphery, and which prevent excessive vacillation of the frame structure during the operation of the apparatus.

F ixedly supported centrally in the frame structure, as indicated at 12', or in any other suitable manner, is a longitudinall extending track 12 comprising a pair 0 channel members 13 and 14, respectively. The channel members 13 and 14 extend parallel, relatively to each other, and have their forward portions 15 curved u wardly. The flanges of the c annel members 13 and 14 are on the inner faces thereof. The upper face of the marginal ed e of each of the lower flanges 16 is formed with transversely disposed gear teeth 17 and the other portion of the upper face of the flan e 16 provides a run-way 18. The gear teet 17 and runway 18 extend throughout the entire'length of the track 12, and the former project above the tread of the latter.

.Mounted in the track structure is a. car-" riage 19, consisting of a transversely extenda wheel 21 rotatably mounted at each en thereof. The wheels 21 travel on respective run-ways 18 on the lower flanges 16 of the track members 13 and 14.

A propelling gear 23 is fixed to the axle 20 ad acent' to each of the wheels 21. These gears 23 are of less diameter than the wheels 21 and mesh with the gear teeth 17 on the lower flange 16 of respective track members 13 and 14. The gears 23 provide a positive propulsion for the carriage 19, forwardly and rea-rwardly in the track structure for the purpose to be described.

The diameter of the wheels 21 being commensurate to the distance between the lower flange 16 and the upper flange 22, the latter in conjunction with the elevated position of the gear teeth 17 ,together with the rear end walls 22', and the securing rod 23' connecting the curved forward ends, of the track members 13, 14, will maintain the carriage 19 in proper operating position at all times in the track members 13 0nd 14, by holdin the gears 23 in mesh with the gear teeth 1% of the track members.

- A pair of elongated scoop arms 24 extend longitudinally forward between the track members 13 and 14, andwhave their rear-ends loosely or pivotally connected, as at 25, to the axle 20 to permit of the rotation of the tion.

latter in said rear ends. The connection of each of the scoop arms 24 with the axle 20 is adjacent to one of the propelling gears 23, as is clearly shown in Figure 4 of the drawhe forward ends of the scoop arms 24 carry an adjustable frame 26 in which a scoop 27, having a pivotal connection 28, is mounted. The forward end of the frame 26 is pivoted, as at 29, to the extreme forward ends of the scoop arms 24, while the rear vertical member 30- of the frame 26 has an adjustable connection 31 with the scoop arms 24. By the adjustment of the connection 31, the angular disposition of the scoop 27, relatively to the scoop arms 24, may be varied to best meet conditions found in ractice.

plate 32, virtually forming the rear end wall of the scoop 27, is fixedly carried by the frame 26. The pivotal connection 28 being disposed forwardly of the central portion of the scoop 27 the forward end of the latter is over-balanced by the rear end, causing the rear end to drop downwardly during the dumping operation and discharge the material through the open rear end.

To provide a latchin element for the scoop 27, the upper portion 33 of the plate 32 is bent forwardly and formed with an aperture 34 for the passage of the apertured catch 35 carried on the top of the scoop 27. A spring controlled latch 36 is mounted on the portion 33, of the plate 32, and normally engages in the apertured catch 35 on the scoop 27 to hold the latter in the closed posi- A flexible member 37 connects the latch 36 with the approximate center of a depending trip lever 38, which latter is pivotally mounted, intermediate of the scoop arms 24, on a transversely supported rod 39.

A trip rope 40, adapted to be manipulated by the operator connects with the lower end of the trip lever 38. By pulling the trip rope 40 the trip lever 38 is actuated to release the latch 36 and permit of the dumping of the scoop 27. The action of the spring controlled latch 36 is such that the locking of the scoop-2 7 is automatic when the latter is thrown, jolted, jarred or jerked to the closed position in the usual well known manner.

A hanger 41 is ivotally connected to the forward ends of tl ie scoop arms 24, through the connection 29, and carries a rotatably mounted pulley 42, positioned centrally of said hanger 41 and intermediate of the scoop arms.

A, pair of cable drums 47 and 48 are loosely mounted on the shaft 43 and positi-oned thereon to aline with the space between the track members 13 and 14. Drum 47 controls the scoop projection or retraction, and the drum 48 controls the scoop elevation.

The outer end of each of the drums 47, 48 is integrally formed with a radial flange 49 having a peripheral flange 50 forming a housing, in which drum operating gear 51 is mounted. The latter is keyed to the shaft 43, as indicated at 52. A series of small gears 53- are rotatably carried by the flange 49 and mesh with the operating gear 51. The periphery of the flange 50 forms a brake drum which is engaged by a brake band-54.

Loosely mounted on the shaft 43, adjacent to each of the drums 47 and 48, is a hub 55 integrally formed with similar flanges 56 and 57 which oppose the flanges 49 and 50 of the drums 47 and 48. The inner face bf the flange 57 is provided with gear teeth 58 which mesh with the small gears 53 on the flanges-49 of respective drums 47 and 48. The periphery of the flange 57 forms a brake drum engaged by the brake band 59'.

The brake bands 54 and '59, associatedL with the drum 48, are-simultaneously anc reversely actuated by the operation of a common shaft 60, that is, when band 54 is tensioned to lock the drum 48 the band 59 is r automatically released to permit of the rotation of the associated hub flange 55, or vice versa. In like manner the brake bands 54 and 59, associated with the drum 47 are simultaneously and reversely operable when actuated by the operation of the sleeve 61 through which the shaft extends. Suit-able and conveniently located operatinglevers 62 and 63 are provided to facilitate the actuation of the shaft 60 and the sleeve 61, respectively.

It will here be noted that either of the operating levers 62 and 63 may be shifted to a neutral position to release its associated brake bands 54 and 59, thereby permitting simultaneous rotation of either of the drums 47 or 48 with its co -operating hub flange 57.

The arrangement of the drums 47 and 48, with their respective operating and controlling mechanisms, provide a well known differential gearing, permitting of the drums 47 and 48 to be independently rotated in the clockwise direction by power through the drive shaft 43, and in the counter clockwise direction by the weight of the co-acting scoop" arms 24 and scoop 27 on their return movements, in a manner hereinafter de-.

scribed.

A cable 64, having one end thereof connected with the drum 47, passes over a sheave 65 which is rotatably mounted, as

at 66, centrally of the forward ends-of the top members 7 of the frame structure. The other end of the cable 64 is attached to the drum 67 which latter is centrally fixed to the carriage axle 20 to turn therewith.

A cable 68, having one end thereof connected with the drtun 48, passes over a sheave 69 rotatably mounted, as at 70, in the vertical projecting ends 71 of the con-. verging forward members 8. The other end of the cable (38 is secured in the link 72 pivoted at 70, after passing through the pulley 42, which latter is connected by the hanger 41 to the forward ends of the scoop arms 24.

The traction and swing operating mechanisms, illustrated in Figure 3, of the drawings, include a longitudinally disposed shaft 73 suitably journaled in the frame structure. Loosely mounted on the rear portion of the shaft 73 is a pair of bevel gears 74 and 75, both of which mesh with a bevel pinion 7 6 fixed on the inner end of the shaft 77, which latter is suitably mounted for rotation in the frame structure. The outer end of the shaft 77 carries a fixed sprocket 78 which is driven through the sprocket chain 79 and the sprocket 8O fixed to the drive shaft 43.

The gears 74 and are provided with respective. cone clutches 81 and 82 which are slidably keyed to the shaft 73 to turn therewith. The clutches are shifted by a pair of cross arms 83 centrally pivoted, as at 84, to clutches 81 and 82, respectively. One end of each of the arms 83 has a pivotal connection 85 with respective ends of a fixedbearing member 86, while the other ends thereof are pivotally joined, as at 87, by a connecting bar 88. The arms 83 are actuated by the pivotal interconnecting operating cranks 89 and 90 and bars 91 and 92, the bar 92 connecting with the forward end of the connecting baf 88. A forwardly extending rod 91' has its rear end fixed in the crank 90 and is mounted for rotation in suitable bearings 92. A fixed treadle 93. positioned for the convenience of the. operator is mounted on the forward end of the rod 91. hen the treadle 93 is depressed in one direction the arms 83 willbe moved forwardly and cause the clutch 82 toengage gear 75 and rotate the shaft 73 in the clock- Wise direction, and when the treadle 93 is depressed in the other direction clutch 81 will actuate gear 74 to drive the shaft 7 3 in the other direction. The normal level position of the treadle 93 positions both clutches 81 and 82 to the inoperative or neutral position.

Slidably carried on the forward portion of the shaft 73 torotate therewith. is a sleeve 94 provided with a gear 95 at its rear end and a gear 96'at its forward end. The gear 95 is adapted to mesh with a gear 97 truck, in either direction, as determined by the direction of rotation of the shaft 73 through the operation of the gear 74 or 75.

The drum 47 now rotatin The gear 96 is adapted to mesh with the gear 100 carried at the upper end of the vertical shaft 101 which forms the center pin pivotally connecting the frame structure with the truck. The lower end'of the shaft 101 is provided with a gear 102 meshing with the gear 103 011 the forward end of the traction shaft 104, which latter is journalled, as at 105, to the under face of the body portion 1 of the truck. The rear end of the shaft 104 carries a gear 106 meshing with a gear 107 fixed to the rear axle of the truck. This gearing transmission provides for the transportation and positioning of the complete machine under its own power.

The sleeve 94 is provided with suitable shifting mechanism 108 to facilitate its operation by the operator. The, arrange ment of the sleeve 94 with gears 95 and 96 is such that one of said gears is always in mesh with its associated gear. No neutral position of these gears being required as their operation depends on the rotation of the shaft 73, which is actuated only when either of the clutches 81 or 82 is shifted to engage respective gears 74 or 75.

' In practice the operation of the apparatus is as follows: Assuming that all parts of the device are in the position shown in Figure 1 of the drawings, the surplus of the cable 64 is being carried and wound on the drum 48. Shaft 43 is running continuously with both drums 47 and 48 inoperatively locked by the brake bands 54 tensioned on their respective drum flanges, while thej brake bands 59 'are in released position allowing the hubs 55 with their flanges to rotate idly with the shaft 43.

To fill the scoop 27 it must be forced forwardly into the material. To do this, the rotating hub 55 with flange gearing 58 co-operating with the drum 47 is stopped and locked by tensioning its brake band 59, during which operation the drum 47 is automatically released to permit its rotation.

and being connected with the carriage drum 67 by the cable 64, the latter will wind from the drum 67 to the drum 47. During this winding operation of the cable 64, the carriage axle 20 carrying the drum 67, must necessarily rotate, causing the carriage 19 to travel forwardly in the track 12 due to the gears closed 23 in mesh with the track gear teeth 17. Upon movement of the carriage 19 in forward direction, the scoop arms 24, connected thereto and carrying the scoop 27, will force the latter into the material and fill the same. During this filling operatlion, the; scoop 27 may be kept at the same level while being forced forwardly by slightly releasing the brake band 54, locking the drum'48,-

and allowing the cable 68 to play out very slowly to keep scoop 27 at its proper level.

After the filling operation, the scoop 27 is elevated to the dumping position by first arresting further forward movement thereof. Upon adjusting brake bands 54 and 59, controlling the drum 48, to permit of rotation of the latter in a manner identical to that above described relative to the drum 47, the cable 68 will wind upon the drum 48 and elevate the forward ends of the scoop arms 24 and the scoop 27 carried thereby. If desired the scoop 27 may be velevating during the filling operation by rotating the drum 48, while the scoop 27 is being forced forwardly by the operation of the drum 47.

While the scoop 27 is elevating the same may be advanced or retracted to properly project the scoop 27, by actuating the carriage 19. By operating clutches 81 or 82 the entire frame structure including scoop 27 may be swung around on the truck to position the scoop in the dumping position.

By releasing the latch 36 the scoop is dumped after which it is again locked in the position in the manner hereinbefore stated.

The return of the scoop 27 and arms 24 to their original or lowered position is accomplished by their own weights when the drums 47 and 48 are released to play out their respective cables 64 and 68, by shifting the operating levers 62 and 63 to their neutral positions to simultaneously release the brake bands 54 and 59 controlling the movements of the drums 47 and 48 and their associated hub flanges 57, due to the fact that the cable 68 constantly exerts a rearward pull when arms 24 are projected, thereby retracting the latter when drum 47 is released. i

As the carriage 19 may be drawn forwardly in the track 12 until it reaches the top of the curvilinear portion 15, and due to the length of the scoop arms 24, the scoop 27 may be projected to an unusually high dumping elevation.

Our improved apparatus having no projecting boom, as used in the ordinary power shovels, it enables the operation of the machine extremely close to the work or excavation.

The structural arrangement of the apparatus makes it a comparatively compact, light and very powerful device of its kind lltl shown is merely illustrative and that various changes in the form, proportion and the ininor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of the invention as defined in the appended claims.

What I claim is 1. A machine for the purpose set forth comprising a portable body portion, a scoop or shovel, a pair of arms connected to and extending rearwardly therefrom into said body portion, a carriage including a drum intermediate its ends, a track supporting the ends of the carriage upon which the carriage is bodily shifted and rotated during its travel said arms pivoted at their rear ends on said carriage, and means winding off the drum during the outward travel thereof for shifting said carriage forwardly on said track whereby the arms with the scoop are projected forwardly of said body portion.

2. A machine for the purpose set forth comprising a portable body portion, a scoo or shovel, a pair of arms connected to and extending rearwardly therefrom into said body portion, a carriage including a drum intermediate its ends, a track supporting the ends of the carriage upon which the carriage is bodily shifted and rotated during its travel said arms pivoted at their rear ends on said carriage, means winding off the drum during the outward travel thereof for shifting said carriage forwardly on said track whereby the arms with'the scoop are projected forwardly of said body portion, and means for elevating the arms at various inclinations with respect to the body portion.

3. In a machine for the purpose set forth, a pair of scoop arms, a scoop or shovel fixed to the, outer ends of said arms, a track, a carriage travelling on the track and having the rear "ends of said arms pivoted thereon and including a drum revolving duringthe travel of the carriage on the track, a pulling member winding oil the drum during the outward travel of the carriage for shiftin the latter to project the arms outwardly, an a pullin member; connected to the scoop for positioning the arms at an inclination.

' {l-. A machine ,for the purpose set forth comprising a portable body portion, a scoop or shovel, a pair of arms connected to and extending rearwardly therefrom into said body portion, a carriage including a drum intermediate its ends, a track supporting the ends of the carriage upon which the carriage is bodily shifted and rotated during its travel said arms pivoted at their rear ends on said carriage, means winding off the carriage during the outward travel thereof for shifting said carriage forwardly on said track whereby the arms with the scoop are projected forwardly of said body portion, said track having its forward portion curvilinear.

5. A machine for the purpose set forth comprising a portable body portion, a scoop or shovel, a pair of arms connected to and extending rearwardly therefrom into said body portion, a: carriage including a drum intermediate its ends, a track sup orting the ends of the carriage upon which t e carriage is bodily shifted and rotated during its travel "said arms pivoted at their rear ends on said carria e, means winding off the carriage during t e outward travel thereof for shifting said carriage forwardly on said track whereby the arms with the scoop are projected forwardly of said body portion and means for elevating the arms at various inclinations with respect to the body portion, said track having its forward portion cur vilinear.

6. In a machine for the purpose set forth, a pair of scoop arms, a'scoop or shovel fixed to the outer ends of said arms, a track, a rotatable carriage having its ends travelling on the track and having the rear ends of said arms pivoted thereon, said track and carriage having co-acting means to provide for the rotation of the carriage during the travel thereof a pulling member winding off the carriage for shifting it outwardly on said track to project the arms outwardly, and a pulling member connected to the scoop for positioning the arms at an inclination, said track having its forward portion curvilinear. 4

7. In a machine for the purpose set forth, a body portion, a track supported therein and having its rear end position between the center and rear end of the body portion, a rotatable carriage having its ends travelling on said track and initially positioned at the rear end thereof, 'a pair of forwardly extending arms pivoted at their rear ends on said carriage, a scoop or shovel fixed to the outer ends'of said arms, and meanswinding off the carriage between the arms for shifting the carriage whereby the arms are projected forwardly of the body portion, said carriage and track having coacting means to cause the rotation of the carriage during theshifting thereof, said arms normally disposed at a downward in? clination with respect to the track, and means for positioning said arms at various inclinations with respect to the track.

8. A machine for the purpose set forth comprising a portable body portion, a scoop or shovel, a pair of arms connected to and extending rearwardly therefrom into said body portion, a rotatable travelling carriage, a track supporting the ends of the carriage and having means co-actin with said ends to provide for the rotation of the carriage during the travels thereof, said arms pivoted at their rear ends on said carriage, and means winding off the carriage between the arms for shifting said carriage forwardly on said track whereby the arms with the scoop are projected forwardly of said body portion, said track formed of two sections, and said carriage and sections having associated means to maintain the carriage on the track.

9. A machine for the purpose set forth comprising a portable body portion, a scoop or shovel, a pair of arms connected to and extending rearwardly therefrom into said body portion, a rotatable travelling carriage, a track supporting the ends of the carriage and having means co-acting with said ends to provide for the rotation of the carriage during the travels thereof, said arms pivoted at their rear ends on said carriage, and means winding oil the carriage between the arms for shifting said carriage forwardly on said track whereby the arms with the scoop are projected forwardly of said body portion, means for elevating the arms at various inclinations with respect to the body portion, said track formed of two sections, and said carriage and sections having associated means to maintain the carriage on the track.

10. A machine for the purpose set forth comprising a portable body portion, a scoop oir shovel, a pair of arms connected to and extending rearwardly therefrom into said body portion, a rotatable travelling carriage, a track supporting the ends of the carriage and having means co-acting with said ends to provide for the rotation of the carriage during the travels-thereof, said arms pivoted at their rear ends on said carriage, means winding off said carriage between the arms for shifting said carriage forwardly on said track whereby the arms w1th the scoop are projected forwardly of said body portion and means for elevating the arms at various inclinations with respect to the body portion, said track havin its forward portion curving upwardly and formed of two sections, and said carriage and sections having associated means to maintain the carriage on the track.

11. A machine for the purpose set forth comprising a track formed of a pair .of spaced track members, means for angular 1y adjusting said track on a vertical axis, a rotatable and shiftable carriage having its ends extended into and travelling on said track members, said members and carriage having co-acting means to provide for the rotation of the carriage during the travel thereof, means for shifting the carriage forwardly causing thereby the rotation thereof, a pair of arms operating between said track members and having their rear ends connected to the carriage whereby when the carriage is shifted the arms will be carried therewith, and a scoop or shovel fixed to the outer ends of said arms.

12. A machine for the purpose set forth comprising a track formed of a pair of spaced track members, a rotatable and shiftable carriage extended into and travelling on said track members, said members and carriage having co-acting means to provide for the rotation of the carriage during the travel thereof, means winding off said carriage for shifting it forwardly causing thereby the rotation thereof, a pair of arms operating between said track members and having their rear ends connected to the carriage whereby when the carriage is shifted the arms will be carried therewith, and a scoop or shovel fixed to the outer ends of said arms, the connection between the arms and carriage being a pivotal one, and means for elevating and lowering said arms.

13. A machine for the purpose set forth comprising a track formed of a pair of spaced track members, a rotatable and shiftable carriage extended into and travellm on said track members, said members and carriage having co-acting means to provide for the rotation of the carriage during the travel thereof, means for shifting the carriage forwardly causing thereby the rotation thereof, a pair of arms operatlng between said track members and having their rear ends connected to the carriage whereby when the carriage is shifted the arms will be carried therewith, and a scoop or shovel fixed to the outer ends of said arms, the connection between the arms and carriages being a pivotal one, and means for elevating and lqwering said arms, said carriage shifted reairwardly by the weight-of the scoop and arms when these latter are lowered.

14. A machine for the purpose set forth' comprising a track formed of a pair of spaced track members, a rotatable and shiftable carriage extended into and travelling on said track members, said members and rear ends connected to the carriage whereby when the carriage isshifted the arms will be carried therewith, and a scoop or shovel fixed to-the outer ends of said arms, the connection between the arms and carriage being a pivotal one, and means for elevating and lowering said arms, said carriage shifted rearwardly by the weight of the scoop and arms when these latter are lowered, said track having its forward portion curvilinear.

15. In a machine for the purpose set forth, a portable swinging body portion, a pair of scoop or shovel arms normally disposed at a downward inclination and having their rear ends normally positioned at the rear of said body portion, a track supported within the body portion and extending to the rear of the latter, a rotatable carriage mounted on the track and having the rear ends of the arms pivotally connected therewith] and capable ,when shifted forwardly to project the arms forwardl of the body portion, a scoop or shovel fixe to the outer ends of the arms, means to provide for the rotation of the carriage during the shifting thereof, means windln off the carriage during the rotation thereof for shifting sa1d carriage forwardly, means for elevating and lowering said arms and operating means for the carriage shifting means and the arms elevating and lowering means, said operating means arranged at the rear of the said body portion. 7

16. A machine for the urpose set forth, comprising a track formed of a pair of opposed and spaced track members each channel shape in cross section, each of said members provided with gear teeth and a run-way, a carriage having its ends provided with wheels travelling on the runway and further provided with gears engaging with said teeth, a pair of scoop or shovel arms operatin between said track members and pivotal y connected at their rear ends to said carriage, a scoop or shovel connected to the outer ends of said arms, and means for shifting the carriage on the track to project the arms forwardly.

17. A machine for the pur ose set forth, comprising a track formed 0 a pair of opposed and spaced track members, each channel shape in cross section, each of said members provided with gear teeth and a runway, a rotatable and travelling carriage having its ends provided with wheels travelling on the runway and further provided with gears engaging with said teeth, a pair of scoop or shovel arms operating between said track members and pivotally connected at their 1 rear ends to said,carriage, a scoop or shovel means winding off the carriage between the.

connected to the outer ends of-said arms,

arms to rotate it and for shifting the carriage on the track to project, the arms for- J wardly, and means connected tothe scoop or shovelfor elevating and lowering said arms.

18. A machine for the pur ose set forth, I

comprising a track formed 0 a pair of opposed and spaced track members each channel shape in cross section, each of said members provided with gear teeth and a runway, a carriage having its ends provided with wheels travelling on the run-way and further provided with gears engaging with said teeth, a pair of scoop or shovel arms operating between said track members and pivotally connected at their rear ends to said carriage, a scoop or shovel connected to the outer ends of said arms and means for shifting the carriage winding off the carriage between the arms on the track to project the arms forwardly, said carriage shifted rearwardly by the weight of the arms when these latter are lowered.

19. In a machine for the pur ose set forth a portable and swinging bo y portion, a scoop or shovel carrier having its rear normally positioned at the rear of said body portion, a track supported-within the body portion and extending from the front to the rear thereof, a rotatable carriage travelling on said track and having the rear of the carrier pivotally connected therewith and adapted when shifted forwardly to pro]ect the carrier a scoop or shovel secured to the outer end of the carrier, said carriage including a drum, means winding off the drum for rotating and shifting said carriage forwardly, \and means for elevating and lowering the carrier, said track having 1ts forward portion curvilinear, said carriage shifted rearwardly by the weight of the carrier when the latter is lowered.

20. Ina machine for the purpose set forth, a carrier, a scoop or shovel fixed to the outer end of said carrier, a track, a rotatable carriage travelling on the track and having the rearend of said carrier pivoted thereon and including a drum, a pulling member mounted on and winding off the drum for rotat ing and shifting the carriage to pro ect the carrier outwardly, and a pulling member connected to'the carrier for positlonmg the carrier at an inclination.

21. In a power shovel, a body port on, a stationary track supported thereln, a projectable and retractable scoop or shovel carrier, and rotatable means travelling on the track for shifting the carrier, said means forwardly of the body portion,

having as apart thereof a cable opera-ted of the body portion, a carrier having its outer terminal portion supporting said scoop, a carriage travelling on said track and having the inner end of said carrier piv-' otally connected thereto, and a windable element connected with and shifting the carriage outwardly on said track whereby'the carrier is projected from said body portion carrying the scoop therewith.

23. A-machine for the purpose set forth comprising a portable body portion, a support mounted thereon and angularly adjustable with respect thereto, means for adjusting said support, a track fixed to and projecting forwardly from said support, a scoop or shovel permanently arranged forwardly of the body portion, a carrler having its outer terminal portion supportin said scoop a carriage travelling on said trac and having the inner end of said carrier pivotally connected thereto, and a windable element connected with and shifting the carriage outwardly on said track whereby the carrier is projected from said body portion carrying the scoop therewith, and means mounted on said support for elevating said carrier,-and said track providing means for the return of said carriage to normal position by the downward swinging of the carrier when the latter is released from elevated position.

24. An excavator comprising a frame having its top projected forwardly of its bottom, ,a track including a straight portion and an upwardly curved portion, said straight portion supported by the bottom of the frame and said curved portion projected beyond the bottom of the frame and connected with the forward end of the top of the frame, a carrier of greater length than the frame, a rotatable carriage travelling on and having end gear connections with said track and having the rear end of the carrier pivotally connected therewith, a frame work depending from the outer terminal portion of said carrier, a dumping scoop or shovel including a fixed and a pivoted section carried by the frame work, and pulling means winding from and off the carriage for shifting the carriage causing thereby the rotation thereof and the projecting of said carmen 25. An excavator comprisi a frame having its top projected forwar ly of its bottom, a track including a straight portion and an upwardly curved portion, said straight portion supported by the bottom of the frame and said curved portion projected beyond the bottom of the frame and con-.

1 nected with the forward end of the top of the frame, a carrier of greater length than the frame, a rotatable carriage travelling on and having end gear connections with said track and having the rear end of the carrier pivotally connected therewith, a frame work depending from the outer terminal portion of said carrier, a'

dumpin scoop or shovel including a fixed and a pivoted section carried by the frame straight portion supported by the bottom of I the frame and said curved portion projected beyond the bottom of the frame and connected with the forward end of the top of the frame, a carrier of greater length than the frame, a rotatable carriage travelling on and havin end gear connections with said track and aving the rear end of the carrier pivotally connected therewith, a frame work depending from the outer terminal portion of said carrier, a dumping scoop or shovel including a fixed and a pivoted section carried by the frame work, and pulling means winding from and off the carriage for shifting the carriage causing thereby the rotation thereof and the pro ecting of said carrier, said carrier normally depending at an inclination with respect to said frame, a windable element supported by the frame for elevating and lowering the carrier, a portable sup ort for said frame and means for angular y adjusting said frame with res ect to said support.

2 7. In a power shovel combination of a scoop, a track composed of a pair of members spaced apart, a scoop, a carrier therefor, a shaft extending between said mem bers, a drum and a pair of gears keyed to said shaft, a pair of rollers for guiding the ends of said shaft along said track members, each of said track members havin a rack for engaging with said gears, sai carrier pivotally connected with. said shaft, and means for revolving said drum to pro ect said carrier and scoop.

28. A machine for the purpose set forth comprising a portable body portion, a scoop or shovel, a carrier connected to and extending rearwardly therefrom into said body portion, a rotatable travelling carriage, a track for supporting said carriage and provided with means co acting with the ends of the carriage to rotate the latter during the travel thereof, said carrier having its rear end pivotally mounted on said carriage, and means winding ofi' the carriage to rotate it and cause the travel thereof forwardly to project the carrier and scoo 29. A machine for the purpose set fbrth.

scoop or shovel, a carrier connected to and extending rearwardly therefrom into said body portion, a rotatable travelling carriage, a track for supporting said carriage and rovided with means co-acting with the ends of the carriage to rotate the latter during the travel thereof, said carrier having its rear-end pivotally mounted on said carriage,

and means Winding off the carriage to rotate it and cause the travel thereof for- Wardly to project the carrier and scoop, said carriage including a drum from which said means Winds off to provide for the rotation and travel of the carriage.

In testimony whereof We aflix our signatures.

LE ROY P. OLUTTER. BIRD C. GLUTTER.

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