US2083834A - Tunneling machine - Google Patents

Tunneling machine Download PDF

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US2083834A
US2083834A US73171034A US2083834A US 2083834 A US2083834 A US 2083834A US 73171034 A US73171034 A US 73171034A US 2083834 A US2083834 A US 2083834A
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frame
machine
cutter
arms
mounted
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Galuppo Louis
Petti Joseph
Coccia Anthony
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Galuppo Louis
Petti Joseph
Coccia Anthony
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/10Making by using boring or cutting machines
    • E21D9/11Making by using boring or cutting machines with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
    • E21D9/112Making by using boring or cutting machines with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines by means of one single rotary head or of concentric rotary heads

Description

June 15, 1937. L .,GALUPPO Er AL TUNNELING MACHINE 3 Sheets-Sheet l Filed June 21, 1954 L ou/s 6AM/PPO, JossH FkrzfANo ANTHo/VY Cocc/ June 15, 1937. 1 GALUPPO Er AL TUNNELING MACHINE Filed June 2l, 1954 3 Sheets-Sheet 3 D.. S. 2% /m ma n PC.A HW.

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Patented June 15, i937 srs TUNNELING MACHINE Louis Galuppo, `l'oseph Petti, and Anthony Coccia, Cleveland, Ohio Application .lune 21, 1934, Serial No. 731,710

16 Claims.

This invention relates, as indicated, to tunneling machines.

Among other objects of the invention are to provide a machine which may be easily moved in the tunnel in which the tunneling operations are being conducted; which is designed to cut materials that have heretofore resisted tunneling operations attempted with existing machines; which may be locked in operative position so as to to resist longitudinal and twisting movements; which may be easily leveled in the event of tilting; which is adapted to bore holes oi relatively small diameter and in which is embodied means whereby the machine may be adjusted to bore holes of various diameters.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims, the annexed :20 drawings and the following description setting A25 used.

In said annexed drawings:

Fig. l is top plan view of the machine; Fig. 2 is a side elevation of the machine; Fig. 3 is a bottom plan view of the machine; Fig. 4 is a transverse crcss-sectional view oi the machine taken on the line ill-l of Fig. 2; Fig. 5 is a transverse cross-sectional view of a portion of the machine, taken on the line 5--5 oi Fig. l; Fig. 6 is an enlarged cross-sectional view taken on the line -i of Fig. 'l and showing a portion of the mechanism for actuating one of the stabilizing wheels; Figs. '7 and 8 are cross-sectional views, taken on the lines l-'l and 8 8 respectively of Fig. 6; Fig. 9 is a front elevation of the cutter assembly; Fig. is a View, partly in cross-section and partly in side elevation, of the cutter assembly, taken on a line substantially indicated by the line l-l of Fig. 9; and Fig. ll is an enlarged cross-sectional View, taken on the line l l-l l of Fig. 9.

Referring more particularly to the drawings, it will be seen that the machine comprises a lower frame l and an Lipper frame 2, the lower frame being provided with longitudinally spaced pairs of hangers 3, in which are journalled shafts and 5. Shaft l has keyed thereon a pair of sprockets 6 and shaft 5 a pair of idler wheels l. Sprockets E serve to drive an endless track 8. It is to be noted that but a single traction device 5 of this character is employed, that the device is rather narrow, and that it is positioned centrally with respect to the sides of the machine. This construction and arrangement of the endless track enables the machine to be swerved within a fairly small radius and enables holes of fairly small diameter to be bored. The track 8 is adapted to be driven by a motor 9 through the intermediary of a worm lll on the motor shaft, worm wheel ll, clutch l2, pinion I3, gear lll, worm l5, worm wheel IB, sprockets Il, chains l0 and sprockets I9, which are mounted on the ends ol shaft 4.

For the purpose of elevating the cutter shaft to be presently described so as to permit the use of cutter-supporting arms of various lengths, the frame 2 is adapted to be elevated vertically with respect to the frame l. This is accomplished by the use of screws 20 which are disposed adjacent the corners of the frames. These screws are suitably mounted on the frame i and are in threaded engagement with the frame 2. Each screw has keyed thereto adjacent its lower end a worm wheel 2l, whereby the screws are rotated to elevate the frame 2. The worm wheels for the screws at the rear of the machine are driven in unison by a motor 22, through the intermediary of a clutch 23, spur gears 24 and 25, worm 26, worm wheel 2l, shaft 28, and worms 28, which are secured to the ends of said shaft. The drive for the worm wheels at the front of the machine is obtained by a motor 30 through mechanism similar in all respects to that for the rear worm wheels, except that bevel gears 3d and 3l are employed instead of worm 26 and worm wheel 2l. By providing separate drives for the front and rear screws, a limited degree of tilting of the frame 2 may be obtained. This is of advantage where the machine is on soft ground and settles to some extent due to its own weight. In such case, the front o-r rear screws may be actuated to restore the upper frame 2 to a horizontal or other desired level. The frames l and 2 are maintained in alignment during elevation or lowering of the frame 2 by means of pins 2d which are secured to the frame 2 and extend into apertures la, in the frame l. These pins not only facilitate the adjustment of the frame 2 with respect to frame l by preventing binding of the screws 20, but are also. effective to take up shearing stresses which would otherwisev be transmitted to the screws 2G during tunneling operations.

Since the machine is provided with a single centrally disposed endless track, it would have a tendency to tilt laterally either when being moved to and from its destination or during movement of the machine in a tunnel. For the purpose of steadying or stabilizing the machine during such movements, we have provided a number of stabilizing wheels or rollers 32. These wheels are disposed. beneath the frame l and preferably adjacent the corners thereof. Each of the wheels is rotatably mounted on a stub shaft 33, which is journalled in a bearing 34 carried by a screw 35. The screws 35 extend upwardly into the frame l and are so mounted that they may be raised or lowered without being rotated. To this end, each screw as shown in Figs. 6, '7 and 8 is provided with a slot or keyway 36, into which extend keys 31 and 38, the key 38 being secured to the frame as by means of a screw 39. Vertical movement of the screw is secured by means of a worm wheel 40 which is in threaded engagement with the screw. The wheels 32 at one side of the. machine are adapted to be raised or lowered in unison and independently of the wheels at the opposite side of the machine. For this purpose, each pair of wheels is driven by a motor di which drives the wheels through the intermediary of a clutch 42, sprocket 43, chain 513, sprocket 5, shaft 4&3 and worm 4l, which are in mesh with worm wheels 40. The wheels 32 are not intended to sustain the weight of the machine, and they are therefore never lowered to a point which would cause them tosustain such weight. Their function is primarily to stabilize the machine during its progress through a tunnel or over city pavements and the like. They also perform certain secondary functions which will appear hereinafter.

The frame 2 of the machine has provided in its upper surface a recess 48 in which is mounted for slidable movement longitudinally of the frame a carriage 4t. The carriage has mounted thereon a plurality of spaced pedestal bearings 50 in which are journalled the cutter shaft 5|, the rear end of this shaft being in abutment with a thrust bearing 52. The cutter shaft is adapted to be rotated by a motor 53 through the intermediary of a chain beit 54, clutch 55, shaft et,

worms 51, worm wheels 58 (see Fig. 5), worms 59 and worm wheels til, the latter being keyed to the shaft 5l. The aforesaid driving mechanism is suitably enclosed within a housing 6l, as shown in Fig. 5. It will be noted that the drive for the shaft 5| is transmitted to the latter at two longitudinally spaced points. This reduces the strain on the various elements of the driving mechanism.

The cutter shaft 5I has rigidly secured to its forward end a cutter head which, as shown in Figs. 9 to 11, comprises a hub 62 and four radially extending members 63. Each of these members has formed in its front face a recess 64 which extends from the extremity of the member to a shoulder 65, which is spaced somewhat from the center of the cutter head. Mounted within these recesses 64 are cutter carrying arms 66. These arms are cut away at their inner ends to provide a shoulder 61 which is adapted to abut the shoulder 65 so as to facilitate the mounting and proper positioning of the arms on the cutter head. When properly mounted, as shown in Fig. 9, the arms 66 are removably secured to the cutter head, as by means of bolts 61 and S8. Each of the arms 66 is provided with a multiplicity of longitudinally spaced recesses 69, within which cutters 'l0 are mounted and removably secured, as by means of set screws 1|.

Each cutter is provided at its opposite ends with a cutting edge 12, so that when one edge of a cutter becomes worn, the. cutter may be reversed and the other cutting edge used. The cutters are moreover so mounted that their forward ends are inclined in the direction of movement of the cutter head. It will also be noted that the arms are offset from or arranged laterally of the axis of the cutter head so that the inner portion of each arm overlaps the inner end of one of the adjacent arms. The arrangement may also be described as consisting of cutters having their cutting edges arranged in two lines which intersect each other at right angles and at the axis of the cutter head. This arrangement enables the arms to be provided with a suicient number of additional cutters to cut material at the very center of the cutter head. It be further noted that the cutters in each arm are uniformly spaced from each other but that the corresponding cutters in each successive arm (considered in a clockwise direction as viewed in Fig. 9) are arranged a little farther from the center of the cutter than those on the preceding arm. Thus, the cutter B is a little farther from the center of the cutter head than cutter A, cutter C exten-ds slightly farther from the center than cutter B, cutter D a little farther than cutter C, etc. The cutting edge of cutter C, however, is a little longer than those of the other cutters and extends inwardly to the center of the cutter head so as to cut material at such point. The outermost cutters E on each arm extend slightly beyond the ends cf the arm and are provided with additional cutting edges I3 (see Fig. l0). By extending the cutters E beyond the ends of the arms and beyond buckets 'M which are secured to these arms, stresses which would otherwise be transmitted to the buckets are absorbed by these cutters. The aforesaid arrangement of the cutters enables the cutting action to be uniformly apportioned among all of the cutters and prevents undue stresses on any of the cutters. As further shown in Fig. .1.0, the cutters are so arranged that those at the center of the cutter head are in advance of those at a greater radial distance from the center, the extent to which the cutting edges on each arm are arranged in advance of the other cutting edges being inversely proportional to the distance of such cutting edge from the center of rotation of the cutter head. This enables the brunt of the pressure on the cutting head at the beginning of the tunneling operations to be sustained by the centrally disposed cutters which are best able to withstand such pressure. By providing cutter-carrying arms which are removably secured to the. cutter head, and by securing the buckets directly to the ends of such arms, instead of to the cutter head, it becomes possible to use longer or shorter arms, as desired, to thereby vary the diameter of the hole which is being bored. Moreover, by securing the buckets directly to the cutter arms, the position of the buckets is automatically changed at the time longer or shorter arms are substituted for those shown.

During the cutting operations, the carriage 49 is adapted to be advanced a predetermined distance, after which it is adapted to be quickly retracte-d to its initial position, as illustrated in the drawings. For this purpose, a screw l5 is provided which is rigidly secured to an abutment 16 on the rear end of the carriage. This screw is adapted to be actuated in either direction without beingrotated, this being accomplished in a manner similar to that in which the screws 35 are actuated. To this end, a worm wheel 'il is threadably secured to the screw and this worm is driven by a worm '18 which is in turn driven by a motor 'i9 through a variable transmission, preferably of the Reeves type. By employing a transmission of this type, the carriage may be advanced'very slowly during the cutting operations, but may be retracted very quickly, thereby effecting a con-- siderable saving in time. To facilitate movement of the carriage i9 a roller is mounted on` the frame.

For the purpose of resisting any tendency of the machine to rotate or twist bodily about the shaft iii as a result of the tunneling operations,

a number of jacks or locking elements l?! are provided. These elements are in the form of internaliy threaded sleeves pointed at one end so as to pierce the walls of the tunnel. They are mounted on screws 82 and are longitudinally adjustable with respect to these screws so that they may be adjusted in accordance with the diameter of the tunnel which is being formed. The screws S2 are adapte-d to' be moved longitudinally without being rotated, and for this purpose, each screw is mounted on a pedestal 83 in a manner similar to that in which the screws 35 and 'l5 are mounted, and has threadably engaged therewith a worm wheel Sli, which is driven by a worm 35.

Worm wheel 85 is driven by motor Sii through clutch 3l, pinion 88 and gear 89. The motors are suitably mounted on the frame 2 of the worm. Each of the locking elements 8l is thus independently actuated.

Means have also been provided for transport-- ing away from the floor of the tunnel the material which has been cut. As previously stated, the buckets M mounted on the cutter-supporting arms 5t, in the course of rotation of shaft 5l pick up the cut material from the floor of the tunnel. When each bucket in turn reaches the uppermost position shown in Fig. 9, the material is dumped from the bucket onto an endless conveyor belt Sii. This belt as shown in Figs. l and 2, is mounted on a frame 9i, which is carried by uprights Sill mounted on the carriage 59. The rear end of the frame 9! is supported by a platform 33 which is mounted on an inverted U-shaped pedestal lid, which in turn is carried by and is vertically ad- 5() justable with respect to arms 95. Arms gli carry wheels Sii, which are adapted to move on rails 9i' which are laid down on the iioor of the tunnel as the machine is advanced, The conveyor belt 95 is driven by a motor S8 through a Reeves or other suitable variable speed transmission, the

motor being mounted on the platform 93.

The machine is also provided with a substantial semi-circular apron 99 which is removably secured tothe front of the frame l and serves to push forward any loose material not picked up by the buckets lli.

The operation of the machine may now be briefly described as follows: The machine is moved to the desired location in a tunnel and is locked (55 in position by advancing the locking elements 8l into engagement with the walls of the tunnel, such walls being generally indicated by the dotdash circle in Fig. 4 of the drawings. With the machine thus in position, the stabilizing wheels 32 may be lowered into engagement with the walls of the tunnel, thereby assisting the elements 8i resisting any tendency of the machine to rotate or twist bodily about the shaft 5i as a result of the tunneling operations. The wheels 32 are also effective to level the machine, if for any reason, it becomes tilted during the tunneling operations. This operation is facilitated as the result of the employment of .only a Single endless track 8 for traction purpose, such track obviously offering less resistance to leveling than would a g pair of laterally spaced tracks.

With the machine thus locked in position, the cutter head is rotated in the direction :indicated by the arrow in Fig. 9 to beginthe cutting opn erations and the `carriage Il@ is simultaneously lo advanced. During the cutting operation, the material which is dumped onto the conveyor belt il@ is carried by the latter to the rear of the machine and is dumped by gravity into a car which follows the machine for this purpose. After the i5 carriage ai! has advanced to its forward limit of movement, it is retracted to its initial position, as shown in Figs. l and 2. The locking elements are then retracted and the entire machine driven forward to a position in which the aforesaid 30 cutting operations may be renewed, whereupon the locking elements are again moved to operative position and cutting is renewed. When it is desired to cause the machine to swerve to some extent to vary the direction of the tunnel, it is il.) only necessary to retract three of the locking ele ments Si, leaving one of the elements, which it is desired to use as a pivot point, in engagement with the wall of the tunnel. The entire machine will then move about this remaining locking ele- 51o ment as a pivot.

When it is desired to bore a tunnel of larger diameter, it is only necessary to elevate the frame l to the desired position and to substitute for the cutter-carrying arms, longer arms.

It is thus seen that we have provided a machine which may be easily moved in a tunnel in which operations are being conducted; which cuts materials that have heretofore resisted tunn neling operations; which may be locked in operao tive position; which may be easily leveled; which is adapted to bore small holes and is adjustable to bore holes of various diameters.

Other modes of applying the principle of our invention may be employed instead of the one .g5 explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

We therefore particularly point out and dis- 5,0 'tinctly claim as our invention:

1. In a tunneling machine, a 1notor-driven frame, a second frame disposed above said motor-driven frame and substantially coextensive in area therewith, screws disposed adjacent 5; the front corners of said frames and adapted to be rotated to raise or lower the front portion of said second frame with respect to the iirst frame, screws disposed adjacent the rear corners of said frames and adapted to be rotated 0 to raise or lower the rear portion of said second frame with respect to the first frame, `and separate motor-driven means for rotating the front v and rear screws independently of each other.

2. In a tunneling machine, a motor-driven .",f' frame, a second frame disposed above said motor-driven frame and substantially coeXtensive in area therewith, screws disposed adjacent the front corners of said frames and adapted to be rotated to raise or lower the front portion ',"9 of said second frame with respect to the rst frame, screws disposed adjacent the rear corners of said frames and adapted to be rotated to raise or lower the rear portion of said second frame with respect to the rst frame, separate motor- 75 driven means for rotating the front and rear screws independently of each other, and means for preventing horizontal displacement of the second frame relatively to the rst frame during rotation of said screws.

3. In a tunneling machine, a main frame, a single endless track for moving said frame, said track being disposed beneath said frame and centrally with respect to the sides thereof, power means for driving said endless track, a second frame disposed above said main frame and substantially coextensive in length and width with said main frame, screws disposed adjacent the front corners of said frames and adapted to be rotated to raise or lower the front portion of said second frame with respect to the main frame, screws disposed adjacent the rear corners of said frames and adapted to be rotated to raise or lower the rear portion of said second frame with respect to the rst frame, and separate motor-driven means for rotating the front and rear screws independently of each other.

4. In a tunneling machine, a slidably mounted carriage, a shaft revolubly mounted thereon, and means for rotating said shaft, said means in.- cluding elements rigidly secured to said shaft at longitudinally spaced points and members in driving engagement with said elements.

5. In a tunneling machine, a slidably mounted carriage, a shaft revolubly mounted thereon and means for rotating said shaft, said means including worm wheels secured to said shaft at longitudinally spaced points therealong and worms in driving engagement with said worm wheels.

6. In a tunneling machine, a main traction frame, a second frame mounted on said main frame, means for adjusting said second frame relatively to said main frame, a carriage slidably mounted on said second frame, means for reciprocating said carriage, a shaft vrevolubly mounted on said carriage, a cutter head mounted on said shaft and means for rotating said shaft, said last-named means including elements in driving engagement with said shaft at a plurality of longitudinally spaced points therealong.

7. In a tunneling machine, a main frame, a single endless track for moving said frame, said track being disposed centrally of said frame, stabilizing wheels mounted on said frame and disposed in vertical planes at opposite sides of said track and underneath said frame and screw means for adjusting said wheels vertically without displacing the wheels from said planes.

8. In a tunneling machine, a traction frame, a single endless track for moving said frame, said track being disposed centrally of said frame, two pairs of stabilizing Wheels mounted on said frame, each pair being disposed in a vertical plane laterally of said track and underneath said frame, individual screw means for adjusting each wheel vertically without displacing the wheel from its vertical plane, and separate power means for independently actuating the screw means of each pair of wheels.

9. In a tunneling machine, a frame, means for moving said frame along a tunnel, a carriage slidably but non-rotatably mounted on said frame, a revoluble shaft mounted on said carriage, a cutter head mounted on said shaft, cutter-carrying arms removably mounted on said cutter head, buckets secured to the ends of said arms and an endless conveyor supported by said carriage and movable bodily therewith as the latter slides with respect to said frame and arranged to convey material deposited thereon by said buckets to the rear of said machine.

10. In a tunneling machine, a frame, a carriage slidably mounted thereon, a shaft mounted on said carriage, a cutter head mounted on said shaft, cutter-carrying arms removably mounted on said cutter head, buckets secured to the ends of said arms and an endless conveyor supported by said carriage, said conveyor being disposed above said carriage and extending from a point adjacent said buckets to a point at the rear of said machine.

1l. In a tunneling machine, a shaft, a cutterhead mounted thereon and provided With a plurality of radially extending members having recesses in the front faces thereof, cutter-carrying arms disposed in said recesses and abutting the side walls thereof, and buckets removably secured to the rear faces of said arms adjacent the ends thereof, said buckets being in abutment with the outer ends of said radially extending members.

l2. In a tunneling machine, a shaft, a cutter head mounted thereon and provided with a plurality of radially extending members having recesses in the front faces thereof, said recesses extending inwardly from the ends of said memers to points spaced radially from the axis of said head, said inner ends of the recesses forming shoulders, and cutter-carrying arms disposed in said recesses and abutting the side walls thereof, said arms having shoulders in abutment with said first-named shoulders.

13. In a tunneling machine, a cutter assembly comprising a rotatable cutter head, and a plurality of cutter-supporting arms mounted thereon, each of said arms overlapping the inner end of one of the adjacent arms and extending substantially to but not beyond the axis of rotation of said cutter head.

14. In a tunneling machine, a cutter assembly comprising a revoluble head and a plurality of cutter-supporting arms mounted thereon, each of said arms extending inwardly substantially to but not beyond the axis of said head.

l5. In a tunneling machine, a cutter assembly comprising a revoluble head, a plurality of cutter-supporting arms mounted thereon, each of i said arms overlapping the inner end of one of the adjacent arms and extending inwardly substantially to but not beyond the axis of said head, and a plurality of cutters removably secured to each of said arms, the cutters on each successive arm being arranged slightly farther from said axis than the corresponding cutters on the preceding arm.

16. In a tunneling machine, a cutter assembly comprising a revoluble head, a plurality of cutter-supporting arms mounted thereon, each of said arms overlapping the inner end of one of the adjacent arms and extending inwardly substantially to but not beyond the axis of said head, and a plurality of equally spaced cutters removably secured to each of said arms, the cutters on each arm overlapping in their cutting action the cutting action of the cutters on the preceding arm.

LOUIS GALUPPO. JOSEPH PETII. ANTHONY COCCIA.

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594000A (en) * 1948-03-19 1952-04-22 Price Co H C Electric line-up clamp
US2694562A (en) * 1948-03-02 1954-11-16 Colmol Company Apparatus for continuously digging coal
US2699328A (en) * 1949-04-02 1955-01-11 Union Carbide & Carbon Corp Mining process and system by remote control
US2733057A (en) * 1956-01-31 Continuous mining machine having
US2757917A (en) * 1953-12-18 1956-08-07 Goodman Mfg Co Mining machine with adjustable boring head having thrust transmitting means
US2821374A (en) * 1955-11-30 1958-01-28 Ingersoll Rand Canada Coal mining machine having a pivotally mounted cutter tube
US2837325A (en) * 1955-08-10 1958-06-03 Goodman Mfg Co Rotary type tunneling machine
US2864599A (en) * 1952-01-23 1958-12-16 John G Masoni Tunnel boring machine having oppositely rotating heads
US2877999A (en) * 1949-09-08 1959-03-17 Colmol Company Continuous mining machine with vertically separable cutter carrying units
US2880707A (en) * 1954-05-11 1959-04-07 Salem Tool Co Coal mining machine
US2979320A (en) * 1958-03-12 1961-04-11 Salem Tool Co Tiltable deep mining auger machine
US2986384A (en) * 1956-10-09 1961-05-30 Joy Mfg Co Mining machine having tiltable dual mining head
US2995352A (en) * 1954-01-25 1961-08-08 Joy Mfg Co Mining apparatus having core forming and core bursting means
US3203737A (en) * 1963-03-18 1965-08-31 Robbins & Assoc James S Rock driling machine
US3231310A (en) * 1961-11-17 1966-01-25 Santucci Construction Company Tunneling machine
US4040669A (en) * 1975-12-11 1977-08-09 Franklin Wesley D Self propelled excavating vehicle
US4068897A (en) * 1976-10-22 1978-01-17 M.A.T. Industries, Inc. Replaceable cutting bit holder assembly
US4755004A (en) * 1986-11-14 1988-07-05 Palmquist Roger A Rotary rocksaw device

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733057A (en) * 1956-01-31 Continuous mining machine having
US2694562A (en) * 1948-03-02 1954-11-16 Colmol Company Apparatus for continuously digging coal
US2594000A (en) * 1948-03-19 1952-04-22 Price Co H C Electric line-up clamp
US2699328A (en) * 1949-04-02 1955-01-11 Union Carbide & Carbon Corp Mining process and system by remote control
US2877999A (en) * 1949-09-08 1959-03-17 Colmol Company Continuous mining machine with vertically separable cutter carrying units
US2864599A (en) * 1952-01-23 1958-12-16 John G Masoni Tunnel boring machine having oppositely rotating heads
US2757917A (en) * 1953-12-18 1956-08-07 Goodman Mfg Co Mining machine with adjustable boring head having thrust transmitting means
US2995352A (en) * 1954-01-25 1961-08-08 Joy Mfg Co Mining apparatus having core forming and core bursting means
US2880707A (en) * 1954-05-11 1959-04-07 Salem Tool Co Coal mining machine
US2837325A (en) * 1955-08-10 1958-06-03 Goodman Mfg Co Rotary type tunneling machine
US2821374A (en) * 1955-11-30 1958-01-28 Ingersoll Rand Canada Coal mining machine having a pivotally mounted cutter tube
US2986384A (en) * 1956-10-09 1961-05-30 Joy Mfg Co Mining machine having tiltable dual mining head
US2979320A (en) * 1958-03-12 1961-04-11 Salem Tool Co Tiltable deep mining auger machine
US3231310A (en) * 1961-11-17 1966-01-25 Santucci Construction Company Tunneling machine
US3203737A (en) * 1963-03-18 1965-08-31 Robbins & Assoc James S Rock driling machine
US4040669A (en) * 1975-12-11 1977-08-09 Franklin Wesley D Self propelled excavating vehicle
US4068897A (en) * 1976-10-22 1978-01-17 M.A.T. Industries, Inc. Replaceable cutting bit holder assembly
US4755004A (en) * 1986-11-14 1988-07-05 Palmquist Roger A Rotary rocksaw device

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