US1249875A - Excavating and dredging machine. - Google Patents

Description

R. E. WILT.

EXCAVATING AND DBEDGING MAM'HNE.

APPLICATION FILED NOV. 29. um.

49375. Mmmm 10%., 11,1911".

amM/wma m2,

R. E. WILT.

EXCAVATING AND DREDGING MACHINE.

APPLICATION FILED NOV. 29 IBM.

II. E- WELT.

EXCAVAIING AND DRIEDGING MACHINE.

Patented Dec. III

5 SHEETS-SHEET 3.

R. E. WILT.

EXCAVATING AND DREDGING MACHINE.

APPLICATION F'ILED NOV. 29. I916.

mwm'm Patented Dec. 11,1917;

5 SHEETS-SHEET 4.

R. E. WILT.

EXCAVATING AND DHEDGING MACHINE.

APPLICATION FILED NOV.29.19I6.

Patented Dec. 11, 1917.

w 'vtucooco a WW crl lllhlllhll) STATES PA lllillhl ll tfllillilltllhl,

B031 E. WIL'L, OF NEW MADISUN. DI-[1(1),

EXGAVATING AINI DEEZDGING MACHINE,

App1ication filed November 29, 1916.

To all whom it may concern."

lle it known that l, Roy E. WVILT, a citi- Zen of the United States, residing at New Madisomin the county of Darke, State of Uhio, have invented a new and useful Excavating and Dredging Machine; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to the art of excavating and the like, and particularly to a new and useful n'iachine or apparatus that may be used for ditclling, for land drain ing, or road ditching, or cutting down hills, in fact, excavating and dredging of any kind.

Une of the objects of the invention is to provide an improved machine of this kind, which is simple, efficient, and found practical in construction, and may be manufactured for a comparatively small outlay, more or less consistent with the character of the machine.

A further object of the invention is the provision of an improved lifting boom, capable of horizontal oscillation in eitherdirection, however, preferably, whereby the boom may be swung rearwardly, so that when the machine is being moved from one place to another, said boom will extend toward the rear.

A further object of the invention is the provision of an improved extensible boom, the extensible section of which having means whereby said section may be extended, even when the boom has been moved laterally in either direction.

further object of the invention is the provision of means for raising and lowering the boom vertically.

Another aim of the invention is to pro ide a man-carrying frame on the boom, whereby the excavating shovels may be alternately nmnually handled by the operator, whereby the shovels may be properly filled prior to being moved toward the shovel dumping mechanism.

A further object of the invention is to provide means for pivotally mounting the man-carrying frame on the boom, whereby the frame may automatically assume a substantially level position as the angle of the boom is altered,

Specification of Letters Iatent.

Patented Dec. 11, 1917..

Serial No. 1134,09 1.

A further object of the invention is to provideexcavating shovels to move toward and from the shovel lifting and dumping boom, that is, alternately, whereby, as one shovel is being filled, the other is being dumped or unloaded. M

Another obj cct of the invention is the provision of means of connection between the man-carrying frame and a mechanism on the supporting base frame of the machine,

whereby the shovels may be moved first in one direction and then the other.

A further object of the invention is to provide an improved shovel hoisting boom, which may be moved laterally simultaneously with the lifting boom, or whereby the lifting boom may be moved independently oi? the shovel hoisting boom, so that the lifting or main boom may be disposed to the rear of the machine when being portable, while the shovel hoisting boom may move only partially rearwardly.

A further obj ect of the invention isto provide a mechanism on the portable frame of the machine having a pair of drums loosely mounted upon shafts, first one and then the other of which to be thrown in gear with its respective shaft, and capable of revoluble movement in opposite directions and having connections with. the excavating shovels, whereby as one shovel is moving outwardly, the otheris moving inivardly.

A hirther object Ofli the invention is to pro vide an especially improved excavating shovel having means mounted thereon and designed to engage the shovel-hoi sting boom, whereby as the boom. raises, the shovel will automatically tilt and dump its lead.

A further aim. of the invention is to so mount the boom-engaging means on the shovel, that when the boom is lowered, said means will automatically disengage the boom, and the shovel will automatically as sumo its proper position for being returned to the ditch or other excavation.

A further object of the invention is to provide means on the sl'iovelflitting boom to limit the movement or engagement of the boom-engaging bails on the shovels.

A further object of the invention is to provide an improved guard bail on the shovel-lifting boom, to prevent the cable connections between the hoisting drums and the shovels from becoming entangled with parts of the shovel hoisting boom.

' convenient shape. is the aim of the invention to mount this :partly in section of the main lifting boom and the shovel lifting boom, and the mast,

and showin the means whereby a section of the'main lifting boom may be extended.

Fig; 4: 1s a detall v1ew 1n elevatlon showingaportlon of the shovel holstmg boom and a shovel in position to be hoisted.

Fig. 5 is a view in side elevation showing the shovel hoisted and the material in the act of dumping.

Fig. 6 is a view in side elevation of the shovel hoisting boom, illustrating the shovel as having been replaced on the ground detached from the boom and in readiness to be returned to the ditch or other excavation.

Fig. 7 is a detail sectional View on line 77 ofFig. 2, showing how the man-carrying frame may be tilted relative to the boom, in order to assume a level position according to the angle of the lifting boom.

Fig. 8 is a detail view of the chain or other connection between the shovels and the mancarrying frame.

Fig. 9 is a view in perspective showing the application of the excavating shovels,

when cutting down a hill or an embankment. Fig. 10 is a view partly in section and partly in elevation, showing the use of one of the shovels in excavating a ditch or the like.

Fig. 11 is a detail sectional view on line 11'11 of Fig. 2, through one of the sockets 84 and one of the cam flanges 83.

Referring more especially to the drawings, 1 designates a suitable or conventional form of main supporting base frame, in fact, a frame which may be constructed of any suitable material and made any suitable or However, in practice, it

frame upon any suitable or conventional form of supportmg traction wheels 2.

Lifting mechanism.

A mast 8 is carried by the frame 1, and

many be loeated on any convenient part of the frame, preferably upon one of the sides. It has been found preferable in the present instance to construct the mast of two vertical parallel side strips or bars 4. The lower ends of the strips or bars are preferably secured by means of the belts or the like 5, to the block or member 6, which is provided with a downwardly protruding extension 7,

which is mounted or journaled in a suitable bearing 8 of a lateral extension t) of one side of the frame 1. liy this conventional con struction, the mast is allowed. to rock horizontally or laterally. The upper extremities of the two plates or bars are secured in the sockets 9 of the capstan plate 10, by means of the bolts or the like l1. 'lhis capstan plate 10 has an upwardly protruding extension 12, which engages a socket 13 of the plate l t, to which the suitable braces 15 are connected, in any suitable manner, preferably integrally. These braces extend rearwardly and forwardly and laterally and downwardly, and have their extremities secured by belts or other means 16 to the frame of the machine, thereby lirmly brac ing the mast, and at the same time permitting the same to rock. l lxtemling through the side strips at any suitable location, pret'- erably substantially centrally, is a pivot bolt 17, on which the lifting boom S is pivotally mounted, between the sides i of the mast. Journaled upon the bolt 17 is a suitable pulley or sheave 19. Mounted upon a suitable pin 20 of the sides or strips 4- of the mast is a pulley or sheave 21. Mounted in suitable bearings 22 upon the forward edges of the sides or strips 1- near the top of the mast, is a shaft 28, on which a drum 24 is journaled to rotate with said shaft. The lifting boom consists of two sections 25 and as. one being extensible relative to the other. The outer extremity of the section 25 has angle strap plates 27 secured 1'ireferably by the bolts 28 to said "extension. These strap plates overlie the opposite sides of the extensible section 26, there being a suitable block or plate 29 between the metal straps 27 and under the section 26, and held by the belt or pin 30. Carried by the inner end of the extensible section 26 are the angular strap plates 32, preferably secured by the bolts 33, and which plates overlie the sides of the section 25, so that the plate or block at can be secured between the metal straps 32, preferably by the bolt or pin 3:). By this construction (which may be varied in details according to the necessary require mcnts) the extensible section 26 may be ad justed outwardly or inwardly. lhe section 26 may be disposed above or below the sec tion 25. The inner extreme end of the section 25 has secured to the opposite faces thereof by means of the bolts or the like 30 the metal straps 37, which are pivoted upon the bolt 17, whereby the lifting boom may be tilted vertically, at the same time the mast is capable of rocking. A suitable eye 38 is carried by the block or plate 29, and to which a suitable pulley 39 is connected. Se-

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cured in any suitable manner, preferably by the bolts 40, to the outer extremity of the extensible section 26 of the lifting boom, is a suitable sleeve casting 41, from which an arm d2 preferably rises. A suitable cable has one end connected preferably to the eye tl of the arm 4E2, and extends toward the mast, and passes several times about the pulley or drum 24, extends downwardly and engages the pulley 19, passes under the pulley 21., and outwardly toward the outer portion of the lifting boom and passes over the pulley 39, and has other extremity connected to a suitable eye laof the rear underpart of the extensible section 26. Upon reference to the drawings, it is to be observed that by rotating the shaft .23 (which is provided with a suitable crank d6) the cable at?) may be operated in either direction, whereby the section 26 may be extended i11- wardly or outwardly, as found convenient. The shaft 23 is provided with a suitable ratchet or other toothed wheel 47, to be engaged by a pawl or dog :16, whereby said shaft 523 may be held in adjusted positions, in order to hold the extensible section out- "wardly or inwardly disposed. Carried by the outer end portion of the section 25 is an eye 50, to which a suitable pulley 51 is connected. Preferably carried by the capstan plate 16 of the mast is an eye 52, to which a suitable pulley 53 is connected. A shaft 54 is mounted in suitable bearings 55 of the mast, and keyed upon the shaft in any suitable manner is a drum 56. This shaft 54; has a suitable crank 57, and provided with a ratchet or other toothed wheel 58, there being a pawl or dog 59 to cooperate with said ratchet, to hold the shaft in different adjusted positions. A cable 60 has one end portion extended several times about the drum 56 and has its extremity secured in any suitable manner (not shown) to said drum. This cable passes about one of the sheaves of the double pulley device 51, then toward the mast and over the pulley 53, and back over the other sheave ofthe double pulley device 51, and then again toward the mast, and has its other extremity secured to the eye 61 of the casing of the pulley 58. It is to be noted that by rotating the shaft 54L by means of the crank 57, the cable may be wound upon or from the drum 56, whereby the lifting boom may be raised or lowered upon its pivot 17. Moreover, it is to be noted that this lifting boom may be employed in connection with other devices other than an excavating machine, for instance, in connection with any suitable hoisting derrick. i

Operators supporting frame.

Carried by the casting 41, preferably integrally, 1s a segment rack 62. Also protruding downwardly from the castlng ll is an arm 63. This arm 63 has a suitable bearing 64- for the pivot pin 65, on the ends of which the upstanding arms 66 of the mancarrying frame 67 are mounted. This man carrying frame 6? consists of the parts 68, the transverse part. 69 and the vertical uprights 70, the lower portions of which ter minute in arms 71, on which the platform 72 is bolted, as at 73, whereby the operator may stand thereon. It is to be noted that where the pin passes through the bearing 64 of the arm 63, said pin is constructed cylindrical, so that the pin may rotate. lil'mvever, where the pin 65 passes through the arms (36, said pin is constructed rectangular in cross section, so that the man-carrying frame. may move with the pin. On one of the rectangular parts of the pin 65 a suit able sleeve 74; mounted to rotate with the pin. This sleeve 7 ihas a lever 75, which is provided with a dog 76 to engage the teeth of the segment. rack, in order to hold the man-carrying frame in. different adjusted positions relative to the angle of the lifting boom, in order to hold the platform 72 sub stantially level at all. times. By manipulating the dog 76 by means of the hand grip 77, in order to disengage the dog from the teeth of said segment, the lever may be moved, consequently, the man-carrying frame,

Ema/eating alto eels.

There are two excavating shovels illustrated, each comprises the shovel body 78, comprising the bottom 79, the two sides 60 and the rear wall 61. Secured to the sides 60 is a U-shaped strap 62, which is rigidly fixed to the shovel. The arch top of this strap 82 has a cam member 63 and a socket 64-, the purposes of which will appear later. A metal strap or bail 65 is pivoted at 86 to the sides of the shovel. A second metal strap or bail 87 is pivoted at 88 to the sides of the shovel, and the arch of this bail has an eye 89. Carried by the eyes by the bails or straps 87 are the pulleys 90 and The side portions of both bails 85 and 87 are connected by the chains 92. A transverse bar 93 is secured to the man-carrying frame, and is provided with cars 94: at its opposite ends, and between these cars, pulleys 95 and 96 are mounted. Depending from the uprights of the man-carrying frame, are the arms 97, to which the strip or bar 96 is secured. This strip or bar 96 has right-angle extending ends, in which the pulleys 99 and 100 are mounted. A suitable chain 161 is connected at one end of the wall 81 of one of the shovels, passes over the pulleys 95 and 99, then over the pulleys 100 and 96, and has its opposite end secured to the "all 81 of the other shovel. The two shovels are designed to operate alternately, that is, as one moves outwardly, the other moves hr &

wardly, and while one is being loaded, the other is being dumped. Suspended from an eye 102 of the man-carrying frame, is a chain 103, to each end of which a shovel handle is connected. l Vhen loading a shovel, say for instance, the shovel on the righthand side, one of the shovel handles 104C and 105 is inserted in the socket 84: 0f the bail 82 of the shovel, whereby the operator may tilt the shovel forwardly, in order to cause the shovel to dig or excavate down into the soil or dirt. When the shovel is filled, the same may be tilted in the opposite direction, in order to throw the dirt or the like toward the wall 81 of the shovel. lVhen filling or loading the other shovel, the handle member 105 is employed in a like manner. As one shovel moves outwardly and the other inwardly, the chain 101 operates over the pulleys 95, 96, 99 and 100.

Mechanism for operating the shoocls.

Mounted in suitable bearings 107 of? the frame 1 are the shafts 108 and 109, on which the drums 110 and 111 are loosely mounted. Also mounted upon the frame 1 toward the rear thereof is a conventional form of motor 112, on the shaft 113 of which a gear 115 is mounted to rotate therewith. This shaft 113 is mounted in a bearing 114, and has loosely mounted thereon a clutch member 116 provided with a friction de pression 117. A clutch member 118 is keyed to rotate with the shaft 113, but capable of axial movement. A suitable lever 119 is pivoted at 120 and has slotted forks 121, the slots of which engage the pins 122 of the usual collar (not shown) of the clutch member 118. It is to be noted that by adjusting the lever 119 in one direction, the clutch member 118 will frictionally engage the friction depression 117, thereby causing the clutch member 116 and the gear 115 to rotate. It is to be noted that the shaft 113,

consists of two sections, 123 and 124, the section 123 is continuously rotated by the motor, while the section 12 1- is only rotated with the section 123, when the clutch members 116 and 118 cooperate. The gear 115 meshes with the gear 125, which is mounted upon a stub shaft 126. The gear 125 in turn meshes with the gear 127, which rotates with the drum 110. The gear 127 in turn meshes with the gear 128, which is mounted upon a stub shaft, as shown. The gear 128 in turn meshes with the gear 129, which rotates with the drum 111. A suitable cable 130 has one end attached at 131 to the frame 1, passes over the pulley 90 of the bail 87 of one of the shovels, then over the pulley 132 of the frame 1, and then is wound about the. drum 111 and has its extremity secured at 133 to said drum. A cable 134 is attached at 135 to the frame 1, and passes over the pulley 91, and then over the pulley 136, and is in turn wound about the drum 110 and has its extremity secured at 137 to said drum 110. The drums 110 and 111 have friction depressions 138 and 139. Clutch members 1 10 and 141 are mounted upon the shafts 108 and 109, respectively, and are keyed to rotate with but axially movable on said shafts. Levers 1 12 and 1143 are pivotally mounted at 14-1: on the arms ll?) of said frame 1. tions 146 with said clutch members 110 and. 141, whereby said clutch members may be moved axially on their shafts. It is to be noted that when the shaft of the motor is operating in one direction, the drum 110 is rotated in the direction of the arrow (1 and the drum 111 in the opposite direetion, which will move the shovel on the left hand side to a position adjacent the frame 1. in order to be dumped or unloaded, while the shovel on the left hand side is moved toward the man-carrying frame. in order to be loaded. hen the engine shaft is operated in the reverse direction, the drum ll 1 is rotated in the direction of the arrow 1), so as to cause the, cable 130 to be wound on the drum 111, thereby pulling the scoop on the right hand side in a position to be unloaded or dumped, and the scoop on the left hand side to a position to be loaded. In other words, when the cable 134- is being wound on the drum 110, the cable 130 is being unwound from the drum 111, and vice versa. Moreover, when the cable 134-. is being wound on the drum 110, the clutch member is thrown in frictional contact with the depression 138, to cause the drum 110 to rotate with the shaft 108, and when the cable 130 is being wound upon the drum 111, the clutch member 141 is thrown in engagement with the depression 139, to cause the drum 111 to rotate with the shaft 109. When either one of the cables 130 or 131- is being unwound, its respective drum is rotating loosely on its shaft, because only the shafts 108 and 109 are geared to the motor shaft. The levers 119 and 14-2 and 143 are held in adjusted positions, by any suitable means (not shown),

Shoocl hoisting boom.

The extension 7 of the mast has an arm 1&8 pivotally mounted thereon, there being a pair of nuts 14-9 and 150 on said extension to prevent downward movement of the arm. A suitable. set screw 151 is carried by the bearing part of said arm 14-8 and is designed. to engage a depression 152 of said extension 7, whereby the arm may move with the extension, so that when the mast is rocked. the arm 1 18 will correspondingly move. However, it will be seen that the mast may be rocked independently of the arm by disengaging the set screw from the extension 7. Carried by the arm 14-8 is an arched strap These levers have suitable eonneet the shovels.

158, to the arms of which the shovel lifting boom 154; is pivotally mounted by means or the rod 155, which is secured in place by the nuts 156. The lifting boom 154: consists oi the members 157, to which the plates or straps 158 are secured as at 159. These straps are pivoted upon the rod. The members 157 are braced transversely by the straps 160. Secured to the outer faces of the members 157, as at 161, are the angular-metal straps 162, to which, bymeans of rivets or bolts or the like 163 a? ll'shaped strip 164: is secured. The arms 165 01 said 'U-shaped strip 1641 are designed to engage the bails 85 of in other Words,'when one oi? the shovels is moved toward its lifting boom, one of the arms 165 engages a bail 85, whereby the shovel may be hoisted. The upstanding proj ect-ions 166"constitute abutments to limit the movement of said bails when engaging the arms 165. Secured to the til-shaped strip or bar 164 are the lower curved end portions of the side arms 16? of the guard strip or member 168. By means 01 this guard strip or member, particularly its sidebulged arms, the cables 180 and 13 1 are prevented from becbming entangled with the various parts of the "lifting end of the shovelhoisting boom. A suitable chain 169 has branching parts 170 attached at 171 to the projections 166. The upper end portion 01: the chain 169 is connected to an eye 172 oi the lifting boom 18. Connected at 173 to the. chain 169 is a pulley 174:, and seciired to an eye175 of the boom 18 is a chain 176, which passes over the pulley 17 1,tl1en overthe pulley 177, and over the pulley 118 of the frame 1, and has its other extremity attached at 179 to a drum 180, which is loosely mounted upon the shaft 109. The drum 180has a friction depression 181. It is to be noted that the clutch member 1 11 has two end cones, one to engage the depression 189, the other to engage the depression 181 of the drum 180. Wi liam the clutch member is thrown in engagement with the depression 181, the drum 180 will rotate with the shaft 109, and. cause the chain 176 to wind partially on the drum 180, and since the bail 85 of one of the shovels may have engaged one off the'arms 165 of the shovel lifting. boom, the shovel will be hoisted. It is to be seen that when the hail of a shovel engages its li-liting'boom, the shovel, assumes a position, as shown in Fig. -jl, therefore, note the position of the digging or excavating edge of the shovel. When the shovel hoisting boom is tilted, the shovel dumps its load, asindicated in Fig. 5, in which case, please note the excavating edge of said shovel, for it is disposed farther outwardly over the ground. fit is to be noted, that when the shovel lilting boom is lowered, the excavating edge of the shovel will strike the ground, in which case,the

Oscillating mechanism for the lifting boom. The outer extremityof thesection 25 of the lilting boom has a laterallyextending arm 188, to the eyes 18901 which the opposite ends of the cable190 are secured. This cable passes over tllepiilleys 191, Which are carried by the standards 192 and 193,and

also passes about the drum194aseveral times.

This dru1n19-1 is mounted upona stand ard 195 and is provided with a crank 196, whereby the drum may be rotated in one direction or the other, thereby enabling the lifting boom to be oscillated horizontally, While by means of the cable 60, the lifting boom may be raised and lowered vertically. It is to be noted that thcli1ting boom 18 may be thrown or oscillated rearn ardly, and supported upon the standard 193, there being a chain 198 to be passed about the boom, to hold the same in such a position, especially, when the excavating machine is being moved fromone place toanother.

In Fig. 10 it is shown howthe shovels are employed for excavating a ditchor the like. In Fig. 9 it is illustrated how the shovels are employed for excavating or cutting a hill or an embankment. 111 this case, however, the chain 101 passes over the pulleys 199, which are carried by the stakes 200. Also in this case, the cables 130 and 13% are operated in a manner similar to that previously set forth. By means of the man carrying frame, which is adjustably connected to the outer end of the lifting boom. 18, an operator maystand thereon, regardless of What position the man carryii'ig frame may assume. The operator on said man carrying 11*211110 may then insert either one of the handles 101and 105 in one or the other said sockets 84 oil the strap 82 of either shovel, to hold the shovel in its starting position, so that when the shovel is moved toward the shovel lifting; boom, the shovel may start excavating properly. In other words by holding the shovel in place by one or the other of the handles 104- and 105, the forward edge of the shovel may properly start cutting into the excavation. Also by means of saidman carrying frame, the operator thereon maydreep the chain 101 in proper operatingbr sliding condition over its pulleys. Ihe operator on said man carrying frame may manipulate the lever 75, whereby said man carrying frame may be adjusted.

The invention having been set forth, what isclaimed as new and useful, is

1. In a dredging machine, the combination of a portable frame and amast mounted thereon, of a lifting boom fulcrumed on the mast, a man carrying frame on the outer end of the lifting boom adjacent to which one or another of the shovels may be loaded, a power mechanism on said frame, shovels operative alternately outwardly and inwardly, connection between the shovels and the man carrying frame, and connections between the power mechanism and the shovels, whereby each shovel may operate outwardly and inwardly.

2. In a dredging machine, the combination of a portable frame and a mast mounted thereon, of a lifting boom fulcrnmed on the mast, a man carrying frame on the outer end of the lifting boom adjacent to which one or another of the shovels may be loaded, a. power mechanism on said frame, shovels operative alternately outwardly and in wardly, connection between the shovels and the man carrying frame, and connections between the power mechanism and the shovels, whereby each shovel may operate outwardly and inwardly, means for hoisting one or the other of said shovels, whereby said shovel may dump its load.

3. In a dredging machine, the combination of a portable frame and a mast mounted thereon, of a lifting boom fulcrumed on the mast, a man carrying frame on the outer end of the lifting boom adjacent to which one or another of the shovels may be loaded, a power mechanism on said frame, shovels operative alternately outwardly and inwardly, connection between the shovels and the man carrying frame, connections between the power mechanism and the shovels, whereby each shovel may operate outwardly and inwardly, means for hoisting one or the other of said shovels, whereby said shovel may dump its load, and means whereby each shovel automatically disengages its hoisting means, when said means is lowered.

4. In an'excavating machine, a frame, a lifting boo-m mounted thereon, a. pair of shovels having connections with the outer portion of the boom, whereby first one and then the other of the shovels may move outwardly, and a Windlass mechanism having connections with said shovels for operating them inwardly and outwardly alternately, a shovel lifting boom, with which one or the other of the shovels engage, and means of connection between the windlass mechanism and the shovel lifting boom for hoisting'saiol shovel lifting boom.

5. In a machine as set forth, a frame, a

lifting boom thereon, means whereby the boom may move laterally, a shovel lifting boom, and means whereby the shovel lifting boom may move independently of or with the first lifting boom.

6. In a machine as set forth, a frame, a mast mounted to rock laterally on the frame and carrying the main lifting boom, said mast having an extension, a shovel lifting boom on said extension, and means of connection between the shovel lifting boom and the extension, whereby the shovel lifting boom may move independently of or with the main lifting boom.

7. In a machine as set forth, a frame, a shovel lifting boom having universal coin nections with said frame, said launn having bail engaging arms, and means on said arms to limit the bails in their movements when engaging said arms.

8. In a machine as set forth. a frame, a shovel lifting boom having universal connections with said frame, said boom having bail engaging arms, and means on said arms to limit the bails in their movements when engaging said arms, and a guard member carried by the boom arching over said ball engaging arms.

9. In a machine as set forth, a frame, a shovel lifting boom mounted thereon. having at its outer end bail engaging arms. abntments rising upwardly from said arms to limit the bails in their movement when engaging the arms.

10. In a machine as set forth, a frame, a shovel lifting boom mounted thereon, having at its outer end bail engaging arms, abntments rising upwardly from said arms to limit the bails in their movement when engaging the arms, and a guard art-hing from one arm to the other, and bulging lat erally from said arm.

11. In a machine as set forth. a shovel hoisting means, an excavating shovel, a bail pivoted to the closed end of the shovel, means for drawing the shovel toward the hoisting means and having connections with the bail for throwing it into position to ongage the hoisting means, whereby as the hoisting means is lowered, the bail will antomatically disengage the hoisting means when lovered. I

12. In a machine as set forth, a shovel hoisting means, an excavating shovel, a bail pivoted to the closed end of the shovel. means for drawing the shovel toward the hoisting means and having connections with the bail for throwing it into position to engage the hoisting means, whereby as the hoisting means is lowered, the bail will antomatically disengage the hoisting means when lowered, and means on the shovel to cam the hoisting means in engagement with the bail.

13. In a machine as set forth, a pair of lid rea ers excavating shovels, meansfor moving such shovels alternately inwardly and outwardly, and a pair of hoisting booms, one over extending the other and having connections with the inner and outer shovels, whereby they may be hoisted simultaneously.

1%. In a machine as set forth, a pair of excavating shovels, means for moving such shovels alternately inwardly and outwardly, and a pair of hoisting booms, one over extending the other and having connections with the inner and outer shovels, whereby they may be hoisted simultaneously, and means whereby both booms may be swung late ally, to move the inner and outer shovels laterally simultaneously.

15.. in a machine as set forth, a pair of excavating shovels, means for moving such shovels alternately inwardly and outwardly, and a pair of hoisting booms, one over extending the other and having connections with the inner and outer shovels, whereby they may be hoisted simultaneously, and means whereby both booms may be swung laterally, to move the inner and outer shovels laterally simultaneously, and means whereby the inner shovel may automatically disengage its lifting boom as its lifting boom lowers.

16. In a machine as set forth, an excavating shovel, a substantially U-shaped bail pivoted at the rear end of the shovel and extending upwardly, lifting means to engage said bail, whereby the shovel may hang downwardly when lifted, means to move the shovel toward the lifting means, whereby the bail may engage therewith, means to lower the lifting means, so that the lower end of the suspended shovel may first contact with the ground, whereby the bail at the rear end of the shovel may auto matically disengage the lifting means.

17. In a machine as set forth, an excavating shovel, a substantially U-shaped bail pivoted at the rear end of the shovel and extending upwardly, lifting means to engage said bail, whereby the shovel hang downwardly when lifted, means to move the shovel toward the lifting means, whereby the bail may engage therewith, means to lower the lifting means, so that the lower end of the suspended shovel may first contact with the ground, whereby the bail at the rear end of the shovel may automatically disengage the lifting means, and a second bail pivoted to the forward ends of the sides of the shovel and having connections with the first bail, whereby, as the shovel assumes a horizontal position on the ground, the first bail is thrown into position to be engaged by the lifting means.

18. In a machine as set forth, a pair of excavating shovels, means for moving such shovels alternately inwardly and outwardly, a pair of hoisting booms, one having an eX- tensible section and over extending the other, said booms having connections with said shovels respectively, whereby they may be hoisted simultaneously.

19. In a machine as set forth, a pair of excavating shovels, means for moving such shovels alternately inwardly and outwardly,

a pair of hoisting booms, one having an extensible section and over extending the other, said booms having connections with said shovels respectively, whereby they may be hoisted siiuultaiuviusly, and a man carrylug frame carried by the extensible section of one of said booms.

20. In a machine as set forth, a pair of excavating shovels, means for moving such shovels alternately inwardly and outwardly, a pair of hoisting booms, one having an ex tensible section and over extending the other, said booms having connections with said shovels respectively, whereby they may be hoisted simultaneously, a frame, a mast mounted thereon, means to pivotally mount one of said booms on the upper end of the mast to pivot vertically, means for pivoting the other boom on the lower end of the mast whereby it may move laterally, and means for connecting the lower boom to the mast whereby it may move with or independent of the mast.

E3]. in a machim as set forth, a frame, a mast mounted pcrpoudicularly thereon to rock, a pair of hoisting booms, onepivoted to move vertically on the upper portion of the mast and having an extensible section over extending the other boom, the other hooin pivoted on the lower end ofthe mast to move horizontally and having a pivoted section to move vertically, and means of connection between the pivoted section of the lower boom and the upper boom.

In a machine as set forth, a pair of excavating shovels, means for n'ioving such shovels alternately inwardly and outwardly, a pair of hoisting booms, one having an extensible section and over extending the other, said booms having connections with said shovels respectively, whereby they may be hoisted simultaneously, and a man carrying frame carried by the extensible section of one of said booms, and means whereby both booms may be swung laterally, to move the inner and outer shovels laterally, and means whereby the inner shovel may automatically disengage its lifting boom as its lifting boom lowers.

In a machine as set forth, a frame, a mast mounted to roclr thereon laterally, a lifting boom pivoted on the mast and ex tending laterally, a man carrying frame pivoted to the outer end of the boom, means for holding said man carrying frame in different swinging adjusted positions, a pair of shovels having a sliding chain connection with the man carrying frame, whereby said shovels may move inwardly and outwardly, and means having cable connections with said shovels opposite the connections of tne sliding chain for moving the shovels inwardly and outwardly.

24. In a machine as set forth, a frame, a mast mounted to rock thereon laterally, a lifting boom pivoted on the upper part of the mast extending laterally, a second lifting boom mounted on the lower end of the mast, a man carrying frame pivoted to the outer end of the first boom, means for holding'said man carrying frame in different swinging adjusted positions, a pair of shovels having sliding chain connections with the man carrying frame, whereby said shovels may move inwardly and outwardly, means having cable connections with said snovels opposite the sliding chain connections for moving the shovels inwardly and outwardly alternately, said shovels having pivoted bails, means carried by the second boom to be engaged by said bails to lift the shovels, each alternately, while the other shovel is being lifted by the first boom through the medium of the chain connections with the man carrying frame.

25. In a machine as set forth, a frame, a mast mounted to rock thereon laterally, a lifting boom pivoted on the upper part of the mast extending laterally, a second lift ing boom mounted on the lower end of the mast, a man carrying frame pivoted to the outer end of the first boom, a pair of shovels, each having a pair of bails, one pivoted adjacent each end of each shovel, the corre sponding bails of both shovels having a chain connection slidably connected to the man carrying frame, whereby said shovels may move inwardly and outwardly, means having cable connections with the bails opposite those to which the chain connected for moving the shovels inwardly and outwardly alternately, and whereby the bails to which the chain is connected are thrown into position to be engaged by the second lifting boom, means carried by the second boom to be engaged by the bails to which the chain is connected to lift the shovels, each alternately, while the other shovel is beinglifted by the first boom through the medium of the chain connection with the man carrying frame.

26. In a machine as set forth, a frame, a mast mounted to rock thereon laterally, a lifting boom pivoted on the upper part of the mast extending laterally, a second lifting boom mounted on the lower end of the mast, a man carrying frame pivoted to the outer end of the first boom, a pair of shovels, each having a pair of bails, one pivoted adjacent each end of each shovel, the corresponding bails of both shovels having a chain connection slidably connected to the man carrying frame, whereby said shovels may move inwardly and outwardly, means having cable connections with the bails opposits those to which thechain connected for moving the shovels inwardly and outwardly alternately, and whereby the bails to which the chain connected are thrown into position to be engaged by the second lifting boom, means carried by the second boom to be engaged by the bails to which the chain is connected to lift the shovels, llt'll alternately, while the other shovel is being lifted by the first boom through the medium of the chain connection with the man carrying frame, means adapted to be manually adjusted, whereby the second boom may move independently of or with the first boom, and mvans for tilting either or both of said booms.

27. In a machine as set forth, a frame, a shovel lifting boom connected thereto, each side end of said boom having an L-shaped bail engaging member.

28. In a machine as set forth, a frame, a. shovel lifting boom connected thereto, each side end of said boom having an L-shapcd bail engaging member, the horizontal arm of the L-shapcd member adapted to be engaged by the bail, while the vertical arm of said member limits the engagement of the bail, and a guard member carried by the boom arching over said L-shapcd bail engaging members.

29. In a machine as set forth, a. frame, a. connection carried by said frame, a pair of lifting booms, one pivotally mounted on the upper end of said connection, the other pivtally mounted on the lower end of said conncction below said frame, and means for connecting one of said booms on the connection, whereby one or both of said booms may be moved laterally independently or together.

30. In a machine as set forth, a frame, a pair of lifting booms, a connection carried by the frame, and connecting the corresponding ends of said booms, whereby they may move simultaneously together or independently of each other, and means connected to one of said booms, whereby the booms may move laterally together, or one independently of the other.

31. In a machine as set forth, a frame, a pair of booms, one having a man carrying frame at its outer end, the other h avin g bail engaging arms, means carried by the frame and connecting the corresponding ends of said booms, whereby they may move laterally together or independently of each other, a pair of shovels having slidable connections with the man carrying frame whereby the shovels may move inwardly and outwardly, said shovels having pivoted bails to engage the bail engaging members of one of the booms, means connected to the shovels for moving them inwardly and outwardly,

and means connected to one of the booms, for moving one or both of said booms latorally. 1

32. lln an excavating machine, a frame, a lifting boom mounted thereon, a man carrying frame mounted on the outer end of said boom, whereby excavating shovels may be loaded, a pair of shovels slidably connected to the man carrying frame and provided with straps having sockets, and a pair of handles loosely suspended from the man carrying frame, one or the other of which is adapted to be manually manipulated by the operator on said man carrying frame to enr gage either one of the sockets whereby a shovel may be loaded.

33. In a machine as set forth, a frame, a perpendicular mast rockably mounted thereon, a pair of booms one pivoted to the up per portion of the mast to move vertically, the other pivoted on the lower end of the mast to move horizontally, means whereby the lower boom may move with or independently of the mast, said lower boom having a pivoted section to move vertically and adjustable connections between the pivoted section of the lower boom and the upper boom.

34. In a machine as set forth, a frame, a perpendicular mast roclrably mounted there on, a pair of booms, one pivoted to the lower end of the mast to move horizontally and having a pivoted section to move vertically, said pivoted section having shovel bail engaging members the other boom being pivoted to the upper part of the mast to move vertically, adjustable connections between the upper boom and the bail engaging 1nembers, whereby the upper boom and the pivoted section may be tilted simultaneously, means whereby the lower boom may move with or independently of the mast, and means connected to the upper boom for oscillating the upper boom laterally,

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses ROY E. WILT.

Witnesses 2 Itoenu'r A, lBoswnnn, PHILIP A, H, Tnunnnn,

toptet at thin patent may he obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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