US1336658A - Road-maker, excavator, and grader - Google Patents

Description

V. SCHMIDT. ROAD MAKER, EXCAVATOR, AND GRADER.

I APPLICATION FILED JULY 7, 19 19. 1,336,658. Patented Apr. 13, 1929.,

4 SHEETS-SHEET 1.

VINVEN TOR.

A TTORNEYS V. SCHMIDT.

ROAD MAKER, EXCAVATOR, AND GRADER.

APPLICATION FILED JULY 7, I919.

\ Patented Apr. 13, 1920.

4 SHEETS-SHEET 2.

-INVENTOR. Va/aemar Sch/77M? A TTORNEYS V. SCHMIDT.

. APPLICATION FILED JULY 7, I919.

ROAD MAKER, EXCAVATOR, AND GRADER.

Patented Apr. 13, 1920.

4 SHEETS-SHEET 3- gg/ja v l/VVI/V TOR Afi'y;

V. SCHMIDT.

ROAD MAKER, EXCAVATOR, AND GRADER.

APPLICATION FILED JULY 7, 1919.

4 SHEETS-SHEET 4.

INVENTOR. Va/akmdr Schmmf VALDEMAR SCHMIDT, F LOS ANGELES, CALIFORNIA.

ROAD-MAKER, EXCAVATOR, AND GRADER.

Specification of Letters Patent.

Patented Apr. 13, 1920.

Application filed. July 7, 1919. Serial No. 309,203.

To all whom it may concern:

Be it known that I, VALDEMAR SCHMIDT, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Road-Makers, EX- cavators, and Graders, of which the following is a specification.

My object is to make 'a road maker, grader and scarifier, and my invention consistsof the novel features herein shown, described and claimed.

Specifically one of the leading objects of my invention is to make a machine which will cut wider than the carriage so as to leave a square bank.

Another specific object is to make machine in which the cutting mechanism may be tilted relative to the carriage so that the carriage may run on a side hill and cut a level road and so that the carriage may run on the level and cut the road to the desired angle as required in making slopes lower than the center of the road.

Another specific object is to provide means for delivering the dirt to wagons at either side of the machine.

Another object is to make a cutter in which the teeth are staggered, with the outer teeth extending beyond the end of the drum so as to avoid friction at the end of the drum.

Another object is to provide means for undercutting from both sides of the gear casing which carries the cutters so as to remove the rib left by the cutters.

Another object is to provide a cutting mechanism operated by gears, the gears being inclosed, dust-proof, and operated in oil.

Figure 1 is a fragmentary side elevation of a road maker, grader and scarifier embodying the principles of my invention, the view being taken looking in the direction indicated by the arrows 1 in Figs. 2 and 3.

Fig. 2 is a sectional top plan as indicated by the line 2-2 in Fig. 1.

Fig. 3 is a vertical cross section on the lines 3?) of Figs. 1 and 2.

Fig. at is a fragmentary horizontal sectional detail taken substantially on the line .i.ft of Fig. 3 and looking downwardly as indicated by the arrows.

Fig. 5 is a fragmentary rear elevation upon an enlarged scale and showing the means for undercutting from both sides of the gear casing which carries the cutters so as to remove the rib left by the cutters.

F igf 6 is a fragmentary detail of one of the under-cutters shown in Fig. 5.

r 1g. r is a iiagmcntaiy top plan new of the cutting and elevating mechanism looking in the direction indicated by the arrow '7 in Fig. 1 and showing the sliding tilting connection between the operating screw shafts and the elevator frame, other parts being omitted.

Fig. 8 is an enlarged detail elevation of the means for pivotally mounting the tilting the cutter and elevator relative to the carriage, the view being taken looking in the direction indicated by the arrows 8 in Figs. 7 and 9.

Fig. 9 is a vertical longitudinal sectional detail on the line 9-9 of Fig. 8 and looking in the direction indicated by the arrows Fig. 10 is a fragmentary side elevation of the elevating and conveying mechanism looking in the direction indicated by the arrow 10 in Fig. 2.

The road making, grading and scarifying mechanism is mounted upon and operated from a carriage which is in the nature of a heavy truck. The carriage has rear wheels 1 and 2 mounted upon an axle 3, side frame bars l and 5 mounted to have their rear ends supported by the axle 3, and front wheels 6 and 7 adapted to support the forward end of the side bars & and 5 and guide the vehicle.

The side bars 1 and 5 are framed together by suitable cross bars, including the bars 8 and 9, and the engine 10 is mounted upon the bars 8 and 9 at the forward end of the side bars 1- and 5 with the forward end of the engine substantially over the front axle 11 so that the weight of the engine will counterbalance the heavy machinery upon the rear ends of the frame and hold the front wheels 6 and 7 to produce sufficient contact with the ground to guide the machine.

The front axle 11 is connected to the frame by a king bolt construction of any suitable type so that the axle is swiveled as required to guide the carriage. The winding drum 12 is mounted behind the axle 11, a wire cable 13 is connected to the drum to wind one way and a cable 14 is connected to the drum to wind the other way, the forward ends of the cables 13 and H are connected to the ends of the axle construction.

worm gear 15 is fixed upon one outer end of the shaft 16 upon which the drum 12 is fixed. A worm shaft 17 is mounted at right angles to the shaft 16 and carries a worm 18 in mesh with the worm gear 15.

A drive shaft 19 has a spur gear 20 fixed upon its rear end. A spur gear 21. meshes with the gear 20, a spur gear 22 meshes with the gear 21 and is fixed upon a shaft 23 having a bevel gear 24 upon its other end. A counter shaft 25 is mounted transversely of the frame and has a bevel gear 26 meshing with the bevel gear 24: and a bevel gear 27 upon one outer end. The bevel gears 28 and 29 are loosely mounted upon the worm shaft 17 in mesh with the bevel gear 27. The double sided clutch member 30 is slidingly splined upon the shaft 17 so that when the clutch member 30 is moved to the right as in Fig. 2 it will engage the clutch member 31 formed integral with the bevel gear 29 and connect the shaft 25 to the shaft 17 through the bevel gears 27 and 29 and operate the drum 12 one way to steer the carriage in one direction, and when the clutch member 30 is moved to the left it will engage a clutch member 32 upon the bevel gear 28 and wind the drum 12 in the other direction to turn the carriage in the other direction.

A hand lever 33 operates the clutch member 30. A hand lever 34 operates the reversible transmission for controlling the direction of rotation of the shaft 19. A shaft 35 is mounted transversely of the bars l and 5 and carries a bevel gear 36 meshing with the bevel gear 37 upon the shaft 38 upon which the gear 21 is fixed.

The gear 39 is mounted upon the outer end of the shaft 35 and connected to the shaft by a clutch 40. A gear 11 is mounted upon a stub shaft in mesh with the gear 39. The clutch 40 is controlled by a hand lever A2. The large gear 43 is moiintel to mesh with the gear 41. A small gear 44. is made ri 'id with the gear 43 and meshes with the large gear as upon the driving axle 3. I

hen the engine 10 is running and the hand lever 41-2 operated to clutch the gear 39 to the shaft the carriage will move forwardly or backwardly upon the ground according to which way the drive shaft 19 rotating, and when the hand lever 42 is operated to disconnect the clutch the cutting and elevating mechanism may be operated or the engine may run without moving the carriage.

Heavy track bars 46 and 47 are fixed to the rear ends of the side bars 41- anc 5 and extend vertically and in parallel positions to points slightly above the surrace 48 of the ground upon which the traction wheels 1 and 2 rest and extend a considerable distance above the side bars t and The track bars 46 and 47 are suitably braced to make a very rigid heavy construction and the track bars are T-shaped in cross section to form the body 49 to which the frame and braces are attached and to form the cross heads 50 projecting backwardly and extending up and down to form the tracks upon which the tilting, cutting and elevating mechanisms are mounted to be raised or lowered.

The operating screw shafts 51 and 52 are mounted through bearings 53 and 54: extending baekwardly from the upper ends of the track bars 46 and 4:7, and the lower ends of the operating screw shafts 51 and 52 are mounted in thrust bearings 55 extending baekwardly from the lower ends of the track bars 46 and 47. Spur gears 56 and 57 are fixed upon the upper ends of the operating screw shafts 51 and 52. A supporting frame 58 is built up from the side bars 4 and 5. A gear 59 meshes with the gears 56 and 57, a gear 60 meshes with the gear 59, a gear 61 meshes with the gear 60, and a gear 62 meshes with the gear 61.

The gears 59, 60 and 61 are mounted in stub shafts 63, 6a and 65 and simply serve to make a transmission connection between the gear 62 and the gears 56 and 57. The gear 62 is fixed upon the upper end of the shaft 66, and a bevel gear 67 is fixed upon the lower end of the shaft 66. The shaft 66 is mounted vertically and the shaft 68 is mounted horizontally and connected to the gear 20 by a gear 69 having a clutch memher 7 0 adapted to be engaged by a clutch member 71. The clutch member 71 is slidingly splined upon the shaft 68, and the gear 69 is loosely mounted upon the shaft, so that when the clutch memb r 71 is moved out of engagement with the clutch member the gear 69 will run without rotating the shaft 68.

The double acting clutch member 72 is slidingly splined upon the shaft 68. Bevel gears 7 3 and 74 are loosely mounted on the shaft 68 and in mesh with the bevel gear 67 and have clutch members 75 and 76 adapted to be engaged by the clutch member 72, so that when the clutch member 72 is operated one way to operate the operating screw shafts 51 and 52 one way and when the clutch member 72 is moved the other way the operation of the screw shafts 51 and 52 is reversed.

The main supporting blocks 77 and 78 fit against the rear faces of the crossheads 56 and have flanges extending forwardly and fitting against the sides of the crossheads, and plates 79 fitting against the flanges and extending inwardly in front of the crossheads, and bolts 80 connecting the plates to the flanges, so that the blocks 77 and 7 8 may slide up and down upon the track bars 46 and 4L7. The operating screw shafts 51 and 52 are screw seated through the blocks 77 and 78, so that as the screw shafts are operated the blocks will move up or down. In a like manner brace supporting blocks 81 and 82 are connected to the track bars 10 and 47 and to the screw shafts 51 and 52 to go up and down simultaneously with the blocks 7? and 78.

The supporting bar 83 rigidly connects the blocks 7'? and 78, said supporting bar being directly in line between the crossheads 50, and a second supporting bar 81 rigidly connects the extreme rear portions of the blocks 7'? and 78, the bar 8s: being he hind the screws 51 and 52, and e shaft 85 is mounted in bearings through the sup porting bars 83 and 81 at the transverse center of the machine half way between the heads 50 and half way between the screws 51 and 52 and extending horizontally and longitudinally of the machine.

A bevel pinion 8G is fixed upon the forward end of the shaft 8-3 in front of the supporting her 83. A shaft 87 is mounted vertically in end thrust bearings 88 and 85- so as to hold the shaft rotatably and so as to hold the shaft against endwise movement, A bearing 90 extends forwardly from a su; porting bar connect the bl 7? and 78. A bevel gear 91 1s swiveled 1n the bearing 90 and slidably splined on the shaft 87, said bevel gear 91 meshing with the bevel pinion S6. A shaft 92 is mounted in the frame and has a bevel gear 93 fixed upon its rear end in mesh with the bevel gear 94; fixed upon the upper end of the shaft 8'4. A spu gear is mounted upon the forward of the shaft 92, and a clutch 96 controls the connection between the end the shaft 92. The spur gear 95 meshes with the spur 97 lined upon the shaft 68.

When the engine 10 is running and driving the gear 20 and the ge 09 is .i \itched to the shaft 68 and the gear 97 clutched to tl e shaft 68 by the clutch member T2 the i will be driven to operate the cutelevating mechanism, and this while the i is moving 1 down by the operation of the sc ews sliding connection being obtained by the bevel gear 91 sliding on the supporting bar 8+1 is lar resets 9S C ifoirnm f it 1 v around the shaft 83. The main has a circular boss 1o0 fitting The p its very large and he vy rear face 101 the bar 84: is .nnd the recess 93 and he free tilting; bar

=3 5 n ish cc (lon- I} p to lit fece 101. centric slots 102, 10-1 are formed through the tilting bar 99 and throi C1 the ioss 9S, and bolts 105 are inserted through the slots 102 103 and 104; and through the bar 841; so that the bolts 105 may be loosened and the bar 99 tilted to the desired angle relative to the carriage and then the bolts tightened to hold the cutting and elevating mechanism to make a road surface at the desired angle relative to the surface of the ground upon which the carriage is running; and so that if desired the bolts may be left loose to allow the carriage to tilt over cobble stones and the like without throwing the cutting and elevating mechanism out of the plane desired.

A segment of worm gear is formed upon the upper edge of the tilting bar 99. E1 worm 107 is mounted in bearings 108 and 109 lined upon the bar 8 1 and meshing with the segment 106 there being wrench seats 110 and 111 upon the ends of the spindle of the worm 107, so that when the bolts are loosened wrenches may be applied to the seats and 111 to operate the worm 107 to tilt the bar relative to the carriage.

The bearings 10S and 109 are removably connected to the bar 81 by bolts 845, so that when it is desiredto allow the cutting and elevating mechanism to tilt freely relative to the carriage, or to allow the cutting and elevating mecl'ianism to run steadily upon its own track with the carriage tilting as upon a rough surface the bolts may be moved and the worm removed or thrown out of mesh.

Arms 112 and. 112 extend from the blocks 77 and "78 screws 11S and 113 screw see ed through the arms 1.1.2 and 112 and engage the outer ends of the ti ting 99 and have handwheels 1141 and le .pon their upper ends and lock nuts L5 upon the screw portions against the arms 112 and 112; so that the handwheels 1141 and 11 1 may be operated to assist in tilting the bar 7 and the lock nuts operated to assist in holding the bar 99 in its adjusted position; and so that the screws me be backed up to allow the tilting oper- 1 n to work freely when desired.

The brace supporting her 110 is rigiiill backwerdl y secured to the brace supportin blocks 81 .s 82 said her 110 extending transversely achine in an arc concentri to the ie nr c shaft 85, and said bar forming a slideway or track The blocxs 1d 2i slidingly moi, led upon the bar 116. The lllfX'lIS 11. 119 and 120 are s'.!l

n block comprises ti against the rear face and upper and lower co es of the bar 110, and gihs or claiiuping plates 122 and 123 are secured to the main portion 121 by bolts 12 1 12:1; so that when the bolts are l or loosened the blocks ind s that when the bolts blocks are locked.

tightened i Ears 120 extend beckwardly from the main portion 121 for the attachment of t ie block 117 braces. A brace 12'? connects Vi to one outer end of the bar 99, and a similar brace 128 connects the opposite end of the bar 99 to the block 120. In a like manner a brace 129 connects the block 118 to the bar 99 at one side of the center, and the brace 130 connects the block 119 to the bar 99 at the other side of the center.

Crossed braces 131 connect the ends of the braces 127 and 129, and crossed braces 132 connect the ends of the braces 130 and 128 so as to make a rigid connection between the bar 99 and the blocks 117, 118, 119 and 120; so that when the bar 99 is tilted the blocks 117, 118, 119 and 120 will be moved; and so that if the blocks are clamped the bar 99 is rigidly held relative to the carriage.

Gear casings 133 and 134 are mounted rigidly in vertical positions and fixed to the rear side of the tilting bar 99 and extend a slight distance above the bar and a great distance below the bar. The gear casings 133 and 134 are built up of heavy material and comprise side plates 135 and 136 and 137 and 138, edge plates 139 and 140 secured to the side plates, and angle irons 141, 142, 143 and 144 securing the side plates to the bar 99 so as to make dust tight chambers.

A shaft 145 is mounted horizontally through the gear casings 133 and 134. Bearing 146 and 147 extend backwardly from the bar 99 and the shaft 145 extends through these hearings. A hearing 148 extends backwardly from the bar 99, and the shaft 145 extends through this bearing. A bevel gear 149 is fixed upon the shaft 145 against the bearing 148 and meshes with the bevel gear 150 fixed upon the rear end of the shaft 85. Bearing plates 151 and 152 are rigidly secured to the outer ends of the bar 99 and extend parallel with the gear casings 133 and 134, and the shaft 145 extends through the bearings 153 and 154 secured to these bearing plates. A spur gear 155 is fixed upon the shaft 145 in the gear casing 134. An idler spur gear 156 is mounted in the gear casing below and meshing with the gear 155. A third gear 157 is mounted below the gear 156 and in mesh therewith. A cutter shaft 158 is mounted through the lower end of the gear casing 134 and fixed in the gear 157. A fourth gear 159 is mounted in the upper part of the gear casing above and in mesh with the gear 155. A shaft 160 is mounted through the upper part of the gear casing 134 and fixed inthe gear 159 and extends through the bearing 161 carried by the upper end of the bearing plate 152, and a sprocket 162 is fixed upon the outer end of the shaft 160.

Bearing plates 163 and 164 are fixed to the bar 99 between the gear casings 133 and 134. A cutter 165 is fixed upon the shaft 158 against the outer side of the gear casing 134 and has a recess 166 in its outer face. A

bearing 167 is rigid with the bearing plate 152 and fits upon the shaft 158 and extends one way from the plate 152 into the recess 166. A second cutter 168 is fixed upon the shaft and has a recess 169 into which the bearing 167 extends. The plate 152 is comparatively thin and the rims of the cutters 165 and 168 fit closely against the sides of the plate, so that the rib left between the cutters in line with the plate 152 will be insignificant.

The cutters 165 and 168 are flat faced wheels having cutting teeth 170 extending outwardly from the flat faces, said teeth being staggered around the wheels, and the outer teeth 171 extending beyond the end face of the outer cutter so as to cut a straight edge face 172 upon the bank and leave a clearance 173 between the face 172 and the end of the cutter 168 and the end of the shaft 158. The bearing plate 152 serves as a brace for the outer cutter and the outer end of the shaft. I

In a like manner the cutter 17 4 is mount ed against the inner side of the gear casing 134 and outside of the bearing plate 164, and the cutter 175 is mounted inside of the bearing plate 164. The cutters 165 and 168 and 174 and 17 5 are operated by the shaft 158. The shaft is supported in the gear casing 134 and braced by the bearing plates 152 and 164, and the shaft 158 is positively driven by the gears 155, 156 and 157 from the shaft 145.

In a like manner the cutters 176, 177, 178 and 179 are mounted upon the shaft corresponding to the shaft 158 and extending through the gear casing 133 and the bearing plates 151 and 163 and driven by a train of gearing in the gear casing 133 from the shaft 145. The cutter 176 has end cutting teeth 180 similar to the teeth 171 so as to cut a straight face 181 upon the bank. In a like manner a shaft 182 is mounted through the bearing plate 151 and through the gear casing 133 and carries a sprocket 183 COI'IBSPOIlCliDg to the procket 162. The sprockets 162 and 183 operate the elevating mechanism.

The posts 184, 185, 186 and 187 are supported upon rollers 188. Bars 189 extend forwardly from the lower ends of the posts 184, 185, 186 and 187 and the central portions of the bars 189 are supported by rollers 190. The idler elevator shaft 191 is mounted in the forward ends of the bars 189. The elevator driving shaft 192 is mounted in the upper parts of the posts 184, 185, 186 and 187 and the bucket conveyers 193 .and 194 are mounted upon sprockets or drums upon the shafts 191 and 192. Bars 195 connect the shaft 191 to the shaft 192 to brace the shafts apart.

Braces 196, 197, 198 and 199 connect the bars 195 to the parts 151, 163, 164 and 152.

Braces 200 and 201 connect the upper end of the post 184: to the blocks 117 and 118. Similar braces 202 and 203 connect the up per end of the post 185 to the blocks 117 and 118. Braces 204-: and 205 connect the upper end of the post 186 to the blocks 119 and 120, and braces 206 and 20? connect the upper end of the post 187 to the blocks 119 and 120. Chains 208 and 209 connect the sprockets 183 and 162 to sprockets 210 and 211 on the ends of the elevator driving shaft 192 so as to drive the elevating mechanism simultaneously with the cutting mechanism. The braces 196, 197, 198, 199, 200, 201, 202, 203, 20%, 205, 206 and 207 connect the elevating mechanism to the cutting mechanism, so that the elevating mechanism goes up and down and tilts with the cutting mechanism.

A conveyer 212 is mounted behind the upper end of the elevating conveyers and runs crosswise of the machine beyond the sides of the elevating mechanism so as to deliver the dirt sidewise into wagons. The driving shaft 213 operates the conveyer 212. A double reversible clutch construction 2 14 is built at one end of the shaft 213 and has a countershaft 215 connected to the elevator driving shaft 192 by sprockets and chains 216.

The clutch construction 21% is controlled by a hand lever 217, so that by moving the hand lever one way the dirt will be delivered to one side of the machine, and by moving the hand lever the other way the dirt will be delivered to the other side of the machine.

Hand levers 218 are pivotally mounted upon the shaft 191 and extend baclrwardly past the posts 184:, 185, 186 and 187, and pinholes 219 are formed through the posts, so that pins may be inserted through a desired hole to engage a desired handle to hold the handle in its adjusted position.

The dirt scoops 220 are connected to the forward ends of the hand levers 218 and are adapted to run upon the bottom 221 formed by the cutters and directly behind the cutters, so that the cutters will throw the dirt into the scoops 220 and the elevating conveyers 193 and 19a will dip into the scoops and take the dirt upwardly and discharge it upon the conveyer 21.2. The edges 222 of the scoops may be guided and adjusted to a limited extent by manipulating the hand levers 218.

Braces 223 connect the rear ends of the braces 196 to the blocks 11?, 118, 119 and 120.

Referring to Figs. 5 and 6 the details of the means for under-cutting from both sides of the gear casing which carries the cutters so as to remove the rib left by the cutters are as follows:

The cutters 165 and 17% fit with their flat end faces against the flat side faces of the gear casing 134:, and the rib left by the cutters is necessarily substantially the width of the gear casing 184-. 1 shaft 22% is inserted through the cutter 165 crosswise of its axis, and arms 225 and 226 are fixed upon the ends of the shaft 221 against the periphery of the cutter 165, said arms being set at right angles to each other when seen as looking at the end of the shaft.

Rollers 227 are mounted in the outer ends of the arms 225 and 22", the axes of the rollers being parallel with the axis of the shaft 22 hitting teeth 228 extend outwardly from the arms and 226, the axes of the cutting teeth being parallel with the shaft 224. In a like nanner a shaft 229 is mcunteo. through the cutter 17%, the aXis of the shaft being crosswise of the axis of the shaft Arms are fiXGCl upon the ends of the shaf 229 correspondin to the arms and 226, rollers are carried by the arms corresponding to the rollers 227, and cutters are carried by the arms and corresponding to the cutters 228.

The arms upon the shaft 229 are arranged to swing in the opposite direction from the arms 225 and 226 upon the shat 22 1, and the rollers 22? drag upon the edge of the gear casing 13% and along the side of the gear casing, so that when the roller 22? of the arm is against the right-hand side of the gear casing 18d, as in Fig. 5, the other arm 226 is passing around the under end of the gear casing and upwardly to cut away the rib, and the under-cutters carried by the cutter 165 work alternately with the under-cutters carried by the cutter 174, so that there are four actions of the under-cutting teeth 22 at each revolution of the cutters 165 and 174.

In a companion application I have shown, described and claimed the under-cutting mechanism and the bank facing mechanism and I do not wish to make such claims herein.

Thus I have produced a road maker, grader and scarifier comprising a carriage, a power plant mounted upon the carriage, gear trains connected to the power plant and to the driving wheels for operating the carriage and to the steering wheels for guidin the carriage, cutting mechanism and ele vatingmechanism connected to the carriage to move up and down, gear trains for moving the cutting and elevating mechanism up and down, means whereby the cutting and elevating mechanism may be tilted to any desired angle relative to the carriage and locked and held in its adjusted position to cut a road at the desired level, or left free to make a road of the desired level while the carriage is tilting as upon a rough surface, and means whereby the dirt may be delivered to wagons to either side of the machine, and there being means for cutting a square face upon a bank and for under-cutting from both sides of the gear casing to remove the rib left by the cutters.

Various changes may be made without departing from the spirit of my invention as claimed.

I claim:

1. A device of the class described comprising a carriage, a power plant mounted upon the carriage, gear trains. connecting the power plant to the driving wheels for operating the carriage and to the steering wheels for guiding the carriage, cutting and elevating mechanism connected to the carriage to move up and down and to tilt sidewise or to allow the carriage to tilt, gear trains for moi-ing the cutting and elevating mechanism up and down, means for tilting the cutting and elevating mechanism relative to the carriage, means whereby the carriage and cutting and elevating mechanism may be held in their tilted positions relative to each other or allowed to tilt freely, means whereby the elevated dirt may be delivered to wagons at either side, means for cutting a square face upon a bank, and means-for under-cutting from both sides of the cutter support to remove the rib left between the cutters.

2. In a device of the class described, a carriage, operating screw shafts vertically mounted upon the carriage, track bars mounted parallel with the square shafts, blocks slidably mounted upon the track bars, the square shafts being screw seated in the blocks, a supporting bar connecting the blocks, a tilting bar pivotally connected to the supporting bar, cutting and elevating mechanism connected to the tilting bar, means for operating the screw shafts to raise and lower the cutting mechanism, and means for tilting the operating bar relative to the carriage.

3. In a device of the class described, a carriage, a cutting drum, and elevating mechanism connected to the carriage by means adjustable vertically, means for tilting the cutting drum and elevating mechanism out of alinement with the vertical alinement of the carriage, a power plant upon the carriage, and mechanism connecting the power plant with the cutting and elevating mechanism for raising and lowering the same.

4. In a device of the class described, a carriage, cutting and elevating mechanism pivotally connected to the carriage so as to tilt laterally relative to the carriage, and means whereby the cutting and elevating mechanism may be forcibly tilted or allowed to run freely.

5. In a device of the class described, suitable supports, a shaft mounted horizontally through the supports, cylindrical cutter bodies mounted upon the shaft against the sides of the supports, cutting teeth mounted upon the cutter bodies and staggered around the cutter bodies so as to make a clean out between the supports and on the outside of the supports, and means for under-cutting the ribs both ways in front of the supports so as to make a clean cut from one end of the cutter to the other.

6. In a device of the class described, suit able supports, a shaft mounted horizontally through the supports, cylindrical cutter bodies mounted upon the shaft against the sides of the supports, cutting teeth mounted upon the cutter bodiesand staggered around the cutter bodies so as to make a clean cut between the supports and on the outside of the supports, means for undercutting the ribs both ways in front of the supports so as to make a clean cut from one end of the cutter to the other, and eXten sions upon the outer cutting teeth projecting beyond the outer ends of the cutter bodies so as to cut a clearance between the ends of the cutter bodies and the bank.

7. In a device of the class described, a carriage,' track bars mounted vertically upon the carriage, upper and lower blocks running vertically upon the track bars, operating screw shafts screw seated through the blocks, cutting mechanism pivotally connected to the lower blocks, a curved horizontal track bar connectin the upper blocks, blocks slidingly mounted upon the curved horizontal track bar, braces connecting the cutting mechanism-to the horizontally sliding blocks, elevating mechanism connected to the cutting mechanism, and'braces connecting the elevating mechanism to the horizontally sliding blocks.

8. In a device of the class described, a carriage, track bars mounted vertically upon the carriage, upper and lower blocks running vertically upon the track bars, operating screw shafts screw seated through the blocks, cutting mechanism pivotally connected to the lower blocks, a curved horizontal track bar connecting the upper blocks, blocks slidingly mounted upon the curved horizontal track bar, braces connecting the cutting mechanism to the horizontally sliding blocks, elevating mechanism connected to the cutting mechanism, braces connecting the elevating mechanism to the horizontally sliding blocks, and means whereby the cutting and elevating mechanism may be forcibly tilted relative to the carriage and held tilted or allowed to run freely.

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

VALDEMAR SCHMIDT.

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