US2165666A

US2165666A - Horizontal drilling machine

Info

Publication number: US2165666A
Application number: US150166A
Authority: US
Inventors: James O Tilly
Original assignee: C M MARTIN; FRANK R MOFFATT
Current assignee: C M MARTIN; FRANK R MOFFATT
Priority date: 1937-06-24
Filing date: 1937-06-24
Publication date: 1939-07-11
Anticipated expiration: 1956-07-11

Description

Filed June 24, 1957 7 Sheets-Sheet 1 rIILrmH @n m. @l f "N f 1 A il.. Nw 1 .N

2,165,5566 '7 Sheets/heet 2 July l1, 1939. .L o. TILLY HORIZONTAL DRILLING MACHINE Filed June 24, 1957 July l1, 1939. J. o. TILLY HORIZONTAL DRILLING MACHINE Filed June 24, 1937 '7 Sheets-Sheet 5 IN VEN TOR ef 0. 777/5, 17 A TT ORNE YS.

A July 11, 1939. J Q, um 2,165,666

HORIZONTAL DRILLING MACHINE Filed June 24, 1937 7 Sheets-Sheet 4 IN V EN TOR.

Jub' 11 1939 J. o. TILLY HORIZONTAL DRILLING MACHINE Filed June 24, 1937 7 Sheets-Sheet '5 Zvw@ f M/ eL July l1, 1939. J. o. TILLY HORIZONTAL DRILLING MACHINE Fild June 24, 1937 7 Sheets-Sheet 6 IN VEN TOR. J 0 /y, BY 5 Xg A TTG/m.

-MY 11, 1939 J. o. TILLY 2,165,665

HORIZONTAL DRILLING MACHINE Filed June 24, 1937 7 sheets-sheet 7 b :E Ig.' 13.7576 '278 Patented July 11, 1939 UNITED STATES PATENT GFFICE HORIZONTAL DRILLING MACHINE fatt, Tulsa, kla.

Application June 24, 1937, Serial No. 150,166

21 Claims.

This invention relates to drilling machines and particularly to machines which are adapted for the drilling of bore holes in the earth under streets and embankments, mines and tunnels and the like, to accommodate the laying therein 0f conduits for fluids, electric cables and the like.

This invention relates particularly to improvements in the Horizontal drilling machine, described and claimed in my former patent No.

1,835,191, -dated. December 8th, 1931.

A principal object is to provide a machine which will be labor saving to a maximum extent, safe in operation and relatively inexpensive in cost, operation and up-keep.

Another object is to provide a machine for boring holes more or less horizontally beneath the surface of the ground, whereby the digging of open ditches is avoided and the consequent inconvenience to traino passing over the surface of the ground is eliminated.

Another object is to provide a construction which is easily portable.

An additional important object is to provide a machine which will simultaneously drill holes and lay casing for lining the holes.

A fiuther object is to provide means for continuously removing cuttings from the bore hole and conveying them from the machine so as not A,to interfere with the operation of the machine.

30,?, A particular object is to provide a machine zlwhereby drilling may be conducted at any desired ,/jangle from the horizontal.

L' A further object is to provide a machine which is in fixed position with regard to the face of the formation to be drilled, while permitting the drilling of holes of any desired length through the formation.

A special object is to provide means in conjunction with a drill and casing, for rotating these 40 members independently of each other or together.

A further particular object is to provide means operable by the machine for adding lengths of drill shaft and casing toitheir respective strings as the drilling progresses and for disconnecting the sections of drill shaft and casing when necessary.

Numerous other objects and advantages will become apparent from a consideration of the following description taken in conjunction with .no the accompanying drawings illustrating an operative embodiment oi this invention` In the drawings:

Fig. l is a side elevation of the assembled machine of this invention.

5;'. Fig. 2 is a plan view of the supporting frames (Cl. Z55-20) showing the position of the main driving mechanism thereon.

Fig. 3 is a View similar to Fig. l, showing the drilling mechanism tilted at an angle above the horizontal. 5

Fig. 4 is an elevation of the movable frame and the drill carriage frame rollable thereon and with the drill mechanism removed.

Fig. 5 is a vertical section of the movable frame and carriage taken along line 5 5 of Fig. 4. 10

Fig. 6 is a side elevation of the main drive mechanism shown in Fig. 3 in plan View and showing in somewhat greater detail the frame work supporting this mechanism.

Fig. 7 is a vertical section taken along line 15 1 of Fig. 6.

Fig. 8 is a vertical longitudinal section through the drill carriage showing in detail the arrangement of the various driving connections to the drill and casing rotating elements.

Fig. 9 is a front end elevation of the assembled machine.

Figs. 10 and 11 are sectional views of the machine taken along lines IIJ--l and I|-l|, respectively, of Fig. 1.

Fig. 12 shows the arrangement of the drive connections to the drilling mechanism.

Fig. 13 is a similar view of the mechanism utilized in rotating the casing.

Fig. 14 is a longitudinal section through the 30 bit head and bit stem.

Fig. 15 is a perspective view partly in section of the casing driving sleeve and chuck.

Fig. 16 is an elevation oi the drilling bit and adjacent parts.

Fig. 17 is a longitudinal sectional view partly in elevation of the same.

Fig. 18 is a longitudinal sectional view partly in elevation of parts arranged at the front end portion of the drill.

Fig. 19 is a perspective view of the thread protector nipple.

Fig. 20 is an elevation of a portion of the drill stem.

Referring specifically to the drawings wherein like reference characters designate like or similar parts, the machine of this invention includes primarily a main frame, indicated generally by the numeral 25, a secondary or movable frame 2B, hingedly mounted at 45 on the main frame, 50 and a drill carriage, indicated at 21, movable longitudinally on the frame 26, and a drilling mechanism, all of which will be described in greater detail hereinafter.

Main frame 25 consists of a pair of parallel 55 beams 28 spaced apart and connected together at their lower edges by means of a plate 29 which extends under substantially the entire length of beams 28. Beams 28 and plate 29, in addition to forming a stationary base for the machine, serve also as a skid surface for moving the machine from place to place either on the ground or by loading on a truck or other vehicle. Near one end of beams 2.8 are xedly attached a pair of oppositely disposed uprights 38, which are connected together at their free ends by a cross member 3|. A pair of braces 32 helps connect uprights 30 rigidly to their respective beams 28. A helicoid conveyor 33 is journalled in bearings 34 and 35 which are supported on plate 29 at opposite ends of frame 25. Conveyor 33 is centered between beams 28 and extends the full length of frame 25. A sprocket 36 is mounted on the rear end of conveyor 33 and is adapted to be driven in a manner to be hereinafter described. A trough 31 encloses conveyor 33 on three sides thereof and throughout its length and is adapted to receive drill cuttings to be removed from the machine by conveyor 33.

Secondary frame 26 consists of a pair of parallel beams 38, which are spaced apart and are mounted between beams 28 at opposite sides of trough 31. Apair of uprights 39, rigidly mounted on one end of beams 38, join at their upper ends to support a bearing 48. A similar pair of uprights 4| (see Fig. 5), mounted on the opposite ends of beams 38, support a bearing 42. Journalled in

bearingsI

48 and 42 is a driven shaft 43, peferably square in cross-section. Rigidly attached to uprights 4| are rearwardly and upwardly extending braces 44, the free ends of which are hingedly attached to the upper ends of uprights 38 by means of trunnions 45, which are journalled in openings in the upper ends of uprights 30. The secondary frame is provided with projecting lugs or plates 38a which rest on the beams 28 and support the forward end of the main frame. A pair of eye plates 41 are iixedly attached to the front endsl of beams 38. Cables 48 are attached to the eye plates and by pulling upwardly on the cables, frame 26 pivots on main frame 25 in a vertical plane.

Drill carriage 21 includes a frame 49 mounted on rollers 58 and adapted to travel longitudinally on beams 38 of frame 26 between uprights 39 and 4|. Frame 49 is moved forwardly on frame 26 by means of cables 5| which are attached to one of the members of frame 49 and extend forwardly thereof under pulleys 52, which are journalled in uprights 39. The carriage is pulled rearwardly on frame 26 by a cable 53 which is attached to the carriage frame and extends rearwardly therefrom. Mounted on the upper portion` of carriage frame 49 and centered therein between beams 38, are a pair of longitudinally spaced

bearings

54 and 55 in which is journalled a cylindrical sleeve 56 which s-lidably surrounds and rotates with shaft 43. Thus shaft 43 is additionally supported by

bearings

54 and 55 and sleeve 56 while permitting the forward and backward movements of carriage 21 on frame 26. Mounted in carriage frame 49, below

bearings

54 and 55, and supported from frame 26 by the rollers 50, are

bearings

51, 58, 59 and 68 which are centered in frame 49 between beams 38 and are spaced apart longitudinally from each other.

Mounted on sleeve 56 (see Fig. 8), between

bearings

54 and 55, are longitudinally spaced clutches 6| and 62. Clutch 6l includes a female sleeve member 63 loosely mounted on sleeve 56 and carrying a sprocket 64, and a male member 65, which is keyed to sleeve 56 and is adapted to be moved longitudinally thereon into engagement with member 63 by means of a lever 66. Clutch 62 is similar in construction and includes a floating female member 61 and sprocket 68 and a male member 69 operated by a lever 18.

J ournalled in

bearings

59 and 68 is drive sleeve 1| (Fig. 8), which surrounds head 12b of a drive shaft 12. Head 12b is preferably square in crosssection and the bore of drive sleeve 1| is of complementary shape so that rotation of the drive sleeve 1| will act to rotate drive shaft 12. The shank 12o of drive shaft 12 (Figs. 8, 12 and 20) extends forwardly of drive sleeve 1| and is cylindrical in shape and threaded externally at its forward end and for a distance forwardly of head 12b (see Fig. 12) A water supply pipe 12d is in communication with an axial bore 12a which extends through drive shaft 12, and is connected to head 12b by a swivel 12e. A sprocket 13 is xedly mounted on drive sleeve 1| and is aligned with sprocket 68 of clutch 62. A chain 14 operatively connects the two sprockets 68 and 13.

Drive sleeve 1|

bearings

59 and 68, sprockets 13 and drive shaft 12 constitute a drill head for the machine, and by virtue of the method oi mounting on carriage 21, the drill head is movable longitudinally on secondary frame 26 (Fig. 12).

Journalled in

bearings

51 and 58 is a casing sleeve or cylinder 15 (Figs. 8, 13 and 15) having an internal bore 15a. and annular end flanges 15b and 15e abutting against the outer sides respectively of

bearings

51 and 58. Internal bore 15a is counterbored for a short distance rearwardly from flange 15b (Figs. 8 and 15) to provide an inner shoulder 15d. A sprocket 16 is flxedly mounted on cylinder 15 between

bearings

51 and 58 and is in alignment with sprocket 64 of clutch 6|, and a chain 11 operatively connects the two sprockets 64 and 16. Attached to flange 15b by means of bolts 89 is a circular chuck 18 which comprises an annular frame formed by semicircular sections 19 and 88 (see Figs. 10 and 13) which are hinged together at one side by means of a hinge 8| and which are detachably connected together at the opposite side by means of registering apertured ears 82 through which a pin 83 is removably inserted. A toothed jaw 84 is adjustably mounted in frame section 19 and is adjustable toward and away from the transverse axis of the chuck by means of a set screw 85. Jaws 86 and 81 are adjustably mounted in frame section 88 and together with jaw 84 are adapted to grip a casing ||4 to rotate same either clockwise or counter-clockwise as will be more fully brought out hereinafter. Chuck 18 is provided with an annular flange 88, consisting of two sections to conform with frame sections 19 and 88, and the frame sections are hingedly attached to flange 15b of cylinder 15 by means of bolts 89. Thus either one of sections 19 or 88 can be swung on hinge 8| 'after pulling pin 83 and loosening certain of the bolts 89 while the other section, by means of the remaining bolts 89, is still attached to ange 15b. Flange 88 has an internal diameter less than that of the counterbored section of cylinder bore 15a, and thus provides a shoulder 98, opposite shoulder 15d. The purpose to which these shoulders are put will be described more fully in connection with the description of the operation of the machine.

A drill shaft |88, having spiral convolutions about the exterior thereof forming a cuttings conveyor 8| and having an axial bore |82, is

connected to shank 12C of drive shaft 12 by means of a collar |03 and extends horizontally A from the central portion of cylinder 15 toward the Y front end of secondary frame 26. Bore |02 of `which is highly advantageous in aiding the bit e@ to drill astraight bore hole through the the drill shaft registers with bore 12a of the drivrormatien to be drilled.

shaft forming a continuous passageway through these members. On the forward end of drill shaft |00 is a threaded nipple |04 (see Fig. 14) into which is threadedly connected a bit head |05. A protection collar |06, having serrations |01 in its forward edge, is mounted concentrically about drill shaft |00 just behind bit head |05. Protection collar |06 (Figs. 12, 13, 16, 17 and 18) is threaded internally in its forward end and counterbored rearwardly of the threads to provide an internal shoulder |08. A liner. |09, threaded externally at its forward end and having an external annular flange IID, is inserted in protection collar |06 and threadedly engaged therewith until flange ||0 abuts against shoulder |08. Liner |09 is also counterbored to provide an annular recess therein.

Protection collar |06 and liner |00 are rigidly mounted concentrically about drill shaft |00 and nipple |04 by means of spacing bars I I2 and the interior diameter of liner |09 is such as to freely receive the forward end of conveyor |0I, which is thus placed in cuttings receiving proximity to bit head |05. By the counterboring of protection collar |06, an annular recess I |20. is provided between the inner wall of collar |06 and the outer surface of liner |09. ,Seated in recess I |2a against flange ||0 is a ring bushing |I3.

A section of casing ||4, having an internally threaded casing collar ||5 mounted on the rearward end thereof, encloses drill shaft |00 and conveyor |0| and the rearward end of drill shaft |00 and conveyor 0| extends beyond collar ||5 (Figs. 8 and 14). The end of casing |I4 bearing collar ||5 extends into cylinder 15 where collar ||5 is received in the counterbored section of cylinder bore 15a between shoulder 90 of the chuck frame and shoulder 15d of the cylinder. Casing ||4 has an external diameter substantially equal to that of liner |09 and the forward end of casing 4 is reduced to form a cylindrical tip I6 which is slidably engaged in recess I I of liner |09. A direction sleeve ||1 surrounds casing ||4 and is rigidly united therewith either by welding or by shrinking same on the casing. The forward end of direction sleeve ||1 is reduced forming a cylindrical tip ||8 parallel to tip ||6 and concentric therewith; Tip I8 is adapted to be slidably received in recess ||2a and into bearing contact therein with bushing |I3,

at the same time that tip I I6 is received in recess I I. The described construction of the rearward ends of protection collar |06 and liner |09 and of the forward ends of casing ||4 and direction sleeve ||1, as illustrated particularly in Figs. 17 and 18, provides a double cylindrical tongue-andgroove joint between these several members. which is adapted to permit casing ||4 and drill shaft |00. with its attached bit head |05 and collar |06. to rotate freely and independently of each other, while remaining in close contact with each other. Direction sleeve has an external diameter substantially edual to that of protection collar |06 as well as that of casing collar I I5.

Bit head |05, the section of drill shaft |00 to which it is connected, protection collar |06, casing section I I4, direction sleeve |I1 and the other elements united with these members, together form a drill bit having independently rotatable members, and wherein the flush arrangement of Bit head |05 has a hollow chamber IIS in the interior thereof, (Fig. 17) which communicates with bore |02 of drillhaft |00, and a series of ports |26 lead from chamber ||9, through the walls thereof, to the front of the bit head and between the wings of the bit head.\

A thread protector nipple |2| (Fig. 8), externally threaded on end, extends into bore 15a of cylinder 15 and engages the threads of casing collar ||5 for the purpose of protecting these threads from damage or clogging by cuttings which will be discharged by conveyor |0| through casing I I il. The rearward end of protector nipple |2| has a circular handle |22 xedly mounted thereon to assist the rotative insertion and withdrawal of nipple |2| from collar H5.

A thrust nut |35 is threadedly mounted on shank '|2c of drive shaft 'I2 and can be moved toward and away from bearing 59 to accommodate the thrust of drill shaft |00 during the drilling operation. A second thrust nut |36 threadedly engages the opposite end of drive shaft 'I2 to limit and control the slippage of drive shaft 12 in sleeve '|l.

Shaft 43 (Fig. 6) extends through bearing 42 rearwardly between uprights 30 and is connected to a stub shaft |23 by means of a universal joint |24 centering substantially in the horizontal axis of trunnions 45. By this arrangement, a flexible joint is pro-vided in shaft 43 which will permit the pivotal movement of shaft 43 in accordance with the pivotal movement of frame 26 in trunnions 45. Stub shaft |23 is journalled in spaced bearings and |26, which are xedly supported on beams 28 of the main frame 25 by upright 1 supports |21 and |20, respectively. Mounted on stub shaft |23, between bearings |25 and |26, is a fly wheel |29, which tends to absorb any whip which might occur in an elongated shaft, such as shaft 43. A main drive sprocket |30 is rigidly mounted on stub shaft |23 and a chain |3| operatively connects sprocket |30 to a suitable source of power for driving the mechanism of the machine. Such a source of power, which is not shown, may be any sort of prime mover commonly used for driving machinery and may be an internal combustion engine, electric motor or steam engine, which is equipped with a reversing connection to sprocket chain ISI. Supported by upright support |21 is a sheave |32, which is adapted to swivel in its support means, and cable 53, which` is utilized to draw carriage 21 rearwardly on frame 26, is passed through sheave |32 and led to a power means suitable for moving the carriage on the frame. On the rearward end of stub shaft |23, is mounted a sprocket |33, which is in alignment with sprocket 36 on conveyor 33 and a chain |34 operatively connects sprockets 36 and |33.

The machine above-described is operated in the following manner: If a horizontal bore hole is to be made beneath a street or other surface which is on the same level as the surrounding area, an excavation slightly longer and wider than the over-all dimensions of the machine is dug to receive the machine and is made sufficiently deep, so that when the machine is in position in the excavation, the drilling mechanism is at the level at which the bore hole is to be drilled. If a bore hole is to be drilled through an embankment, the machine is simply moved into position at the proper level against the face of the embankment and is ready to begin operation. A pressure water supply line is connected to pipe 12d, chain |3| is operatively connected to a suitable prime mover and cables 5| and 53 connected to suitable means, such as a power winch which, by pulling on cables 5| and 53 will move the carriage 21 and its drilling mechanism toward or away from the formation to be drilled. Power from the prime mover is now applied through chain |3| and sprocket |30 to stub shaft |23 and thence to driven shaft 43 and shaft 43 is placed in driving engagement with the sleeve 1| rotating drill shaft in a clockwise direction to drive bit head into the formation to be drilled. Bit head |05 is continuously held against the face of the formation by continuous pull applied to cable 5| by the power winch (not shown). When the drill is started, water under high pressure is forced through bore |02 of the drill shaft, entering through bore 12a of the drive shaft 12, and is ejected through ports in the bit head. The jetting of the high pressure water assists in the boring and also washes the cuttings from the bore hole, the cuttings being caught by the convolutions of conveyor |0|, which conveys them through casing ||4 and discharges them through the open end of protector nipple |2|, from which the cuttings fall into trough 31 to be moved by conveyor 33 which discharges them rearwardly from frame 25, to be removed manually or otherwise from the vicinity of the machine. Conveyor 33 is in operation at this time due to its connection by means of chain |34 to stub shaft |23.

Normally, as the drilling proceeds, clutch 6| is left in dis-engaged position and casing ||4 is', therefore, not rotated. Nevertheless, because of the method of mounting in the carriage 21, casing |4 will follow the bit head into the bore hole as the drilling proceeds. Should it be found desirable to rotate casing ||4 and direction sleeve I1, as for example, to loosen the drill when some obstruction, such as a rock, lodges between the bore hole and sleeve ||1, clutch 6| may then be engaged and the casing and its sleeve rotated by means of the connection formed by chain 11 between sprockets '64 and 16, until the obstruction has been dis-lodged and the drill freed. At the same time, rotation of the drill shaft |00 may be continued or clutch 62 may be dis-engaged and only the casing rotated.

When the full length of the section of casing |4 has been drilled, the carriage 21 with its supported mechanism will be at the forward end of frame 26. At this time, protector nipple |2| is backed out of collar I|5, drill shaft |00 disconnected from drive shaft 12, chuck 18 is opened to clear collar ||5, whereupon carriage 21 with its supported mechanism is drawn backward along frame 26 by pull applied to cable 53, leaving casing |4 in the bore hole, as shown in Fig. 3. The front end of secondary frame 26 is then lifted by an upward pull applied to cables 48, frame 26 pivoting on trunnions 45, until the front end of this frame is clear of the excavation in which the machine is placed. This position of frame 26 is also shown in Fig. 2. A new section of drill shaft |00 is then extended through cylinder 15 and connected to drive shaft 12 and a new section of casing ||4 is slipped overthe drill shaft and into cylinder 15. Chuck frame 18 is then locked about the casing and the chuck jaws brought into engagement therewith by adjustment of set screw 85. In the view showing in Fig. 3, new sections of casing and drill shaft have been inserted in cylinder 15. Frame 26 is then lowered back into normal position and the ends of new sections of casing and drill shaft brought into alignment with the corresponding ends of the sections of casing and drill shaft in position in the bore hole. Clutches 6| and 62 are thrown into engagement, and drive shaft 12 and cylinder 15 rotated in the clockwise direction to make up the new sections of casing and drill shaft into their respective strings, and protector nipple |2| is again screwed into the casing collar. Clutch 6| is then disengaged but rotations of drill shaft continued, thereby continuing the drilling operation until the new sections have drilled their full length into the formation. The adding of new joints of drill shaft and casing is repeated as the drilling continues until drilling of the bore hole is completed. At this time, not only will the bore hole have been drilled, but will be completely lined with casing which may be left in the hole by disconnecting the bit head and stem from the casing and drill shaft protruding from the forward end of the bore hole, disconnectingthe driving mechanism from the casing and drill shaft at the machine end of the bore hole, and with drawing the 4drill shaft from the casing.

If it is desired to Withdraw the casing from the bore hole, the machine may also be utilized for this purpose. The bit head and bit stem is disconnected from the forward end of the casing and drill shaft and carriage 21 is drawn backward on frame 26. In carrying out this movement chuck 18 is left in closed position about the casing and the backward movement of the carriage and cylinder willpull shoulder 90 of the chuck frame against the casing collar and thus provide a means, in addition to the chuck jaws themselves, for gripping the casing and pulling the entire string backwardly from the bore hole, 'Ihe drill shaft being connected to drive shaft 12, which is locked against withdrawal from sleeve 1| by thrust nut |36, will also be pulled back at the same time. When a full section of casing has been pulled from the bore hole, tongs are applied to the next following section of casing, clutch 6| is thrown into engagement and the rotation of drive shaft 43 reversed, causing the withdrawn section of casing to be unscrewed from the following section. Clutch 62 is then thrown into engagement reversing the drill shaft rotation and hold back means applied to the following section of drill shaft and the rst drill shaft section is then unscrewed from the drilling string. With both the casing and drill shaft sections free, the front end of frame 26 is lifted until it is clear of the excavation, and the casing and drill shaft sections removed from the machine. This operation is then repeated until all of the casing and drill shaft have been removed from the bore hole.

With the machine of this invention, bore holes;

may be drilled horizontally or at an angle above the horizontal without changing the position of stationary frame 25. Holes may be drilled at an angle below the horizontal by proper positioning frame 25. Holes of any desired length and diameter may be drilled thereby, and the machine may be constructed to utilize casing and drill shaft sections of any desired length. Commercial machines designed in accordance with this invention are designed for the boring of holes having diameters ranging from three inches up to twenty-eight inches and up to several hundred feet in length. The machines are preferably constructed in various sizes, each size to drill bore holes having a limited range of diameters, as for example from twelve to twenty-eight inches or from three to eight inches, and to accommodate ve or ten foot sections of casing and drill shaft.

Numerous other modifications may be made in size, form and arrangement of parts withoutdeparting from the scope of the appended claims.

What I claim and desire to secure by Letters Patent is:

1. A machine of the class described, comprising an elongated substantially horizontally disposed primary frame, a secondary frame arranged substantially parallel to and resting on the primary frame and having one of its end portions pivotally connected to the primary frame for movement about a horizontal axis arranged crosswise of the primary frame, a carriage movable longitudinally of said secondary frame, a drill supported by said carriage, a casing surrounding said drill and also supported by the carriage, meansfor simultaneously moving the carriage, drill and casing longitudinally of the secondary frame, means for rotating the drill, and means for rotating the casing independently of the drill.

2. A machine of the class described, comprising an elongated substantially horizontally disposed primary frame, a secondary frame arranged substantially parallel to and resting on the primary frame and having one of its end portions pivotally connected to the primary frame for movement about a horizontal axis arranged crosswise of the primary frame, a carriage movable longitudinally of said secondary frame, a drill supported by said carriage, a casing surrounding said drill and also supported by the carriage, means for simultaneously moving the carriage, drill and casing longitudinally of the secondary frame, means for rotating the drill, means for rotating the casing independently of the drill, and a spiral conveyor surrounding the drill and positioned between the drill and said casing.

3. A machine of the class described, comprising an elongated substantially horizontally disposed primary frame, a secondary frame arranged substantially parallel to and resting on the primary frame and having one of its end portions pivotaly connected to the primary frame for movement about a horizontal axis arranged crosswise of the primary frame, a carriage movable longitudinally of said secondary frame, a drill detachably connected to and supported by the carriage, a casing detachably connected to the carriage and I surrounding said drill, means for simultaneously moving the carriage, drill and casing longitudinally of the secondary frame, and means for rotating the drill and casing while they are moving with the carriage longitudinally of the secondary frame.

4. A machine of the class described comprising, a stationary frame, a normally horizontal secondary frame pivotal on said stationary frame for movement about a horizontal axis, a drill longitudinally and horizontally movable on said secondary frame, a casing surrounding said drill and movable longitudinally therewith, driving means for rotating said casing and separate driving means for rotating said drill independently of said casing, both of said driving means being longitudinally movable on said secondary frame in accordance with the longitudinal movements of the drill and casing, and a conveyor arranged between the drill and casing.

5. A machine of the class described comprising a stationary frame, a secondary frame pivotal on said stationary frame, a drill longitudinally movable on said secondary frame, a casing surrounding said drill and movable longitudinally therewith, a driven shaft journalled in said secondary frame, a driving connection from said driven shaft to said casing for rotating same, a separate driving connection from said driven shaft to said drill for rotating said drill independently of said casing, both of said driving connections being slidable on said driven shaft in accordance with the longitudinal movement of said drill and casing and means for driving said driven shaft.

6. A machine of the class described comprising, a stationary frame, a secondary frame pivotal on said stationary frame, a drill longitudinally movable on said secondary frame, a casing surrounding said drill and movable longitudinally therewith, a cylinder surrounding said casing, chuck means attached to said cylinder and releasably engaging said casing, means for rotating said cylinder and separate means for rotating said drill independently of said cylinder, both of said latter means being movable on said secondary frame in accordance with the movement of said drill and cylinder.

'7. A machine of the class described, comprising an elongated substantially horizontally disposed primary frame, a secondary frame arranged substantially parallel to and resting on the primary frame and having one of its end portions pivotally connected to the primary frame for movement about a horizontal axis arranged crosswise of the primary frame, a rotatable driven shaft mounted on and arranged parallel to the secondary frame, a carriage movable longitudinally of said secondary frame and slidably engaging said shaft, a drill carried by said carriage, a casing surrounding said drill and also carried by said carriage, means for simultaneously moving the carriage, drill and casing longitudinally of the secondary frame, and means operatively connecting the shaft and drill for rotating said drill.

8. A machine of the class described, comprising an elongated substantially horizontally disposedl primary frame, a secondary frame arranged substantially parallel to and resting on the primary frame and having one of its end portions pivotally connected to the primary frame for movement about a horizontal axis arranged crosswise of the primary frame, a rotatable driven shaft mounted on and arranged parallel to the secondary frame,

a carriage movable longitudinally of said secondary frame and slidably engaging said shaft, a drill carried by said carriage, a casing surrounding said drill and also carried by said carriage, means for simultaneously moving the carriage, drill and casing longitudinally of the secondary frame, means operatively connecting the shafttherefrom and for continuing the rearward movement of said cuttings and a driving connection from said drill rotating means to said second conveying means.

10. A machine of the class described comprising a stationary frame, a secondary frame pivotal on said stationary frame, a drill longitudinally movable on said secondary frame, a casing surrounding said drill and movable longitudinally therewith, a first conveyor cooperating with said drill and rotatable in said casing for conveying drill cuttings from the head of said drill and discharging same rearwardly through said casing, a second conveyor journalled in said stationary frame and adapted to receive the cuttings discharged from said casing, means for rotating said drill and driving said rst conveyor and a driving connection from said drill rotating means to said second conveyor.

l1. In a machine of the class described, a frame, a carriage longitudinally movable on said frame, a driven shaft journalled in said frame parallel to the path of movement of said carriage, an elongated drill shaft rotably journalled in said carriage and longitudinally movable therewith, a boring bit attached to the forward end of said drill shaft, a collar xedly mounted on said drill shaft rearwardly of said bit, a casing surrounding said drill shaft rearwardly of said collar and rotatable independently of said drill shaft and collar, a cylinder surrounding said casing and rotatably journalled in said carriage and longitudinally movable therewith, chuck means carried by said cylinder releasably engaging said sleeve, independent driving connections from said driven shaft to said drill shaft and said cylinder, said independent driving connections being slidable on said driven shaft in accordance with the longitudinal movement of said drill shaft and cylinder, power operated means for driving said driven shaft, and means for moving said carriage longitudinally on said frame.

12. A machine of the class described, comprising a stationary frame, a normally horizontal second frame pivotal on said stationary frame for movement about a horizontal axis, a drill longitudinally and horizontally movable on said secondary frame, a casing surrounding said drill and movable longitudinally therewith, driving means for rotating said casing', separate driving means for rotating said drill independently of said oasing, both said driving means being longitudinally movable on said secondary frame in accordance with the longitudinal movement of the drill and casing, means for connecting both said driving means together whereby the drill and casing may be rotated together, and a conveyor arranged between the drill and casing.

13. A machine of the class described' comprising a stationary frame, a secondary frame pivotal on said stationary frame, a` drill longitudinally movable on said secondary frame, a casing surrounding said drill and movable longitudinally therewith, a driven shaft journalled in said secondary frame, a driving connection from said driven shaft to said casing for rotating same, a separate driving connection from said driven shaft to said drill for rotating said drill independently of said casing, both of said driving connections being slidable on said driven shaft in accordance with the longitudinal movement of said drill and casing, clutch means carried by said driving connections whereby said drill and casing may be driven together, a power shaft rotatably journalled in said stationary frame, a

ilexible driving connection between said power shaft and said driven shaft, and a connection for supplying power to said power shaft.

14. A machine of the class described comprising, a frame, a drill head longitudinally movable on said frame, an elongated drill shaft rotatably connected to said drill head, a boring bit attached to the forward end of said drill shaft, a collar surrounding said drill shaft rearwardly of said bit and rotatable with said drill shaft, a casing surrounding said drill shaft rearwardly of said collar and rotatable independently thereof, said casing being smaller in external diameter than said collar, a sleeve surrounding said casing and xedly attached thereto, said sleeve having an external diameter equal to that of said collar, and a cylindrical tongue and groove joint between said collar and said casing and sleeve, whereby said collar and said casing and sleeve may rotate independently of each other while in contact with each other. v

15. A machine of the class described comprising an elongated substantially horizontally disposed primary frame, a secondary frame arranged substantially parallel to and resting on the primary frame and having one of its end portions pivotally connected to the primary frame for movement about a horizontal axis arranged crosswise of the primary frame, a drill movable longitudinally of said secondary frame, a casing surrounding said drill and movable longitudinally of the secondary frame, means for simultaneously moving the drill and casing longitudinally of the secondary frame, and means for rotating the drill or casing while they are moving longitudinally of the secondary frame.

16. A machine of the class described comprising, a frame, a carriage movable longitudinally on said frame, a driven shaft journalled in said frame parallel to the path of movement of said carriage, a drill head mounted on said carriage, a drill shaft rotatably connected to said drill head and extending forwardly of said frame, a cylinderl journalled in said carriage and surrounding said drill shaft forwardly of said drill head, a casing surrounding said drill shaft forwardly of said cylinder and extending into said cylinder, chuck means carried by said cylinder and releasably engaging said casing, driving connections from said driven shaft to drill head and said cylinder and means for reversably driving said driven shaft.

17. A machine of the class described comprising an elongated substantially horizontally disposed primary frame, a secondary frame arranged substantially parallel to and resting on the primary frame and having one of its end portions pivotally connected to the primary frame for movement about a horizontal axis arranged crosswise of the primary frame, a drill movable longitudinally of said secondary frame, a casing surrounding said drill and movable longitudinally of the secondary frame, means for simultaneously moving the drill and casing longitudinally of the secondary frame, means for rotating the drill or casing while they are moving longitudinally of the secondary frame, and a spiral conveyor surrounding the drill and positioned between the drill and said casing.

18. A machine for making substantially horizontal conduits under roadways or the like, comprising a primary supporting frame, a secondary frame movably connected to the primary frame to permit the front end portion of the secondary frame to be moved upwardly from a lower substantially horizontal position into an upper position and vice versa, one of said frames being provided With planar guide means which are normally substantially horizontally arranged, a carriage supported by the secondary frame and movable along said guide means, a drill stem movable With the carriage along the guide means and having a bit at its outer end, a casing movable with the carriage along said guide means and surrounding the drill stem, a conveyor positioned within the casing, and means for rotating the drill stem While it is moving With the carriage along said guide means.

19. A machine for making substantially horizontal conduits under roadways or the like, comprising a primary supporting frame, a secondary frame movably connected to the primary frame to permit the front end portion of the secondary frame to be moved upwardly from a lower substantially horizontal position into an upper position and vice versa, one of said frames being provided With planar guide means which are normally substantially horizontally arranged, a carriage supported by the secondary frame and movable along said guide means, a drill stem movable with the carriage along the guide means and having a bit at its outer end, a casing movable with the carriage along said guide means and surrounding the drill stem, a conveyor positioned Within the casing, and means for rotating the drill stem and casing while they are moving with the carriage along said guide means.

20. In an apparatus of the character described, a driving shaft, a carriage movable longitudinally of the shaft, a drill stem having a 'portion journaled in the carriage and arranged parallel to the driving shaft, means including a clutch having a portion splined to the driving shaft for driving said portion of the drill stem from the driving shaft, a sleeve of relatively large diameter in comparison with said portion of the drill stem journaled in said carriage and arranged co-axially with the drill stem, means including a clutch having a portion splined to the driving shaft for driving the sleeve independently o-f said portion of the drill stem, a chuckoperatively connected with said sleeve, a section of casing surrounded by the chuck and locked to the sleeve, a coupling arranged substantially Within the sleeve and having threaded engagement with one end o`f the section of casing, and a tubular thread protector extending into the sleeve and having threaded engagement with said coupling.

21. A machine for making conduits under roadways or the like comprising a primary supporting frame, a secondary frame having one of its end portions pivotally connected to the primary frame for movement about a horizontal axis to permit the other end portion of the secondary frame to be swung upwardly from a substantially hor-izontal position into an inclined position and vice versa, one of said frames being provided with planar guide means normally substantially horizontally disposed, a carriage swingable with the secondary frame and movable along said guide