US 2084686 A
Description (OCR text may contain errors)
193$, F. L. HOWARD I SAIPLE TAKING CHINE Filed June 21, 1955 s Sheets-Shut 1 J fl m mm m fi Z k m y Hm. l N IHHnl n 5 x r m M 1... 2- unfit: hi -l- -h v m II &.m/ x m a w m M W a June 22, 1937. F. L'HOWARD SAIPLE TAKING CHINE Filed June 21, 19:5
3 Sheets-Sheet 2 Ii/IIlI/ll/ 4, 1 11/ 1/41/64 ./I///////// 4/ 1/1115 l/llll/l t June 2?, 1937. F. L Hoybmb 2,984,585
Filud June 21. 1955 s meta-Sheet a effective machine for obtaining samples of ce- Patented June. 22,1937
UNITED STATES PA ENT OFFICE FranR -BM 19 Claims. 3:1 :53? 3 50': v
This invention relates to a machine for taking samples and relates more particularly to a drilling machine for obtaining cores or samples of concrete, masonry units, stone work, etc., for the purpose of testing and determining the character of the same. A general object of this invention is to provide a readily portable and a practical mentitious structures, partitions, roads, etc. Another object of the, invention is to provide a compact sell-contained portable machine ior Fig. 3 is an enlarged fragmentary horizontal dedrilling or obtaining samples of roads, walls, partitions, etc., of cementitious material and the Another object or the invention is to provide a sample taking machine of the character mentioned that is operable to obtain samples that Another object of the invention is to provide a machine of the character mentioned that is mobile,"being supported on wheels so that it may be readily drawn or towed from place to place by an automobile or truck.
Another object of the invention is to'provide a, drilling machine or sample taking machine of the character mentioned that is operable to drill into a street, roador other substantially horizontal structure while carried by the wheeled vehicle-or trailer, and that may be removed from the traileriorthe purpose of obtaining a core or sample of a vertical, inclined or overhead wall or the like.
Another object of the invention is to provide a machine or the character mentioned in which the mechanism or unit that is removable from the trailer includes the power unit, the drill driving mechanism, the drill feeding mechanism and all other parts necessary to the drilling or sample taking operation. I
A further object of the invention is to provide a sample taking machine of the character mentioned that may be veryquickly set up or arranged for operation and that is easy and simple to operate and control.
The various objects and ieatures or the invention will be fully understood from the following vertical detailed sectional view showing the drill penetrating the cementitious structure or work and illustrating certain of the parts in elevation.
tailed sectional view taken substantially as indicated by line 3-4 on Fig. 2. Fig. 4 is an enlarged fragmentary vertical detailed sectional view of the. driving head and adjacent parts. Fig. 5 is a horizontal detailed sectional view taken substantially as indicated by line 5-5 on Fig. 4 showing the driving-head and pump in elevation, and Fig. 6 is a side elevation of the removable drilling mechanism arranged to take a sample or a vertical wall showing the drill penetrating the wall.
. The machine provided by the present invention includes, generally, a vehicle or trailer II, a support or guide column I I removably carried by the trailer ll, a drilling or driving head l2 movable on the column H and operable'to transmit rotation to a drill I3, 9. power unit I! for driving or rotating the'drill it through the medium or the head I! and movable on the column H together with the head I2, means I! for advancing or feeding the drill l3 into the work W, means It The members II are supported on and connected with an axle ll. Suitable wheels l8 are provided. on the opposite projecting ends of the axle It. A shaft 2. or other suitable means is provided at the forward end or the trailer III for facilitating its connection with an automotive vehicle. A housing or body 2| is provided on the trailer for enclosing the drilling mechanism. The back and top or a portion of the top of the body I 0 are preferably open. The invention includes jacks trailer and suitable heads 24 are provided on' their lower ends for engaging the road or work -W. Openings 25 are provided in the heads 24 v for receiving a rod or wrench for adjusting the screws 23. There may be two jacks of the character described provided on each frame member I! at longitudinally spaced points to effectively stabilize the trailer and hold it in place when the mechanism is in operation. The trailer body 2| may have a compartment 26 for carrying tools, etc. A door 21 isprovided for normally closing the compartment 26. I
The column ll serves to support and guide the head l2 and the power unit M for movement whereby they may be shifted by the feed 'meansjl5 to advance and retract the drill l3.
. .It is a feature of the invention that the column ,H' is removably ordetachably secured to the .trailer' l6 so that the active or operative drilling mechanism may be removed from the trailer when it is desired to obtain a sample of an upright or overhead structure. The column I! is preferably in the nature of a tube or pipe and is arranged vertically or at right angles to the frame members I l. The supporting and guiding column II is preferably spaced between the 'frame members I! and is preferably spaced rearwardly' from the akle l8. A bracket 28" extends between and is attached to the frame members I! and has an opening 29 receiving or passing the column II. The bracket 28 is sectional having a cap or section 28 that is removableto allow the column I l to be removed from the bracket and vehicle It. One or more hand screws 30 may be threaded through open-,
ings in the bracket 28 to engage the column II to hold or retain the column in the desired or adjusted position. The column H is sufficiently long to project upwardly through the body 2| and to project downwardly beyond the frame members I1 to have its lower end at or adjacent the work W.
Means is provided for supporting the lower end of the column II on the road or work W andfor steadying the column. A base .plate 3| is adapted to be arranged on the upper surface of the road or work W and has a collar 32 which receives the lower end portion of the column H. A bolt 33 passes through transverse openings in the column and collar 32 to removably attach the plate 3| to the column. Where the machine is to be used as illustrated in Figs. 1 and 2 of the drawings screws 34 maybe threaded through openings 35 in corner portions of the plate 3| to engage the upper surface of the road or work W to position the plate and steady the plate and column II. In addition to supporting and steadying the lower end of the column I! the plate 3i carries means for guiding and steadyifig the drill l3 as will be hereinafter described.
The drilling head or driving head 52 is provided to carry the drill l3 and its operating stem and to transmit rotation thereto. The head [2 is supported by and movable on the column I l. The means for supporting or mounting the head I2 on the column ll includes a sleeve 36 surrounding and shiftable on the column. The sleeve 36 carries the head l2 and the column I].
' about the shaft 55.
2,084,686 for stabilizing the trailer l0 and for holding power unit l4 and is keyed to the column H so that it cannot turn. In the preferred structure illustrated a rib or key 31 is attached to the column II and a groove 38 in the sleeve 36 slidably receives the key, the key and groove cooperating to prevent turning of the sleeve on the column. In practice the key 31 may extend throughout substantially. the entire length of the The head l2 includes an upper section 39 which is bolted or otherwise secured to the sleeve 36. The section 39 preferably projects rearwardly from the sleeve 36 relative to the front of the trailer Ill. A tubular drill stem 40 is provided for carrying the drill l3 and extends parallel with the column ll to have its upper portion extend through openings 4| and 42 in the section 39. Packing 43 is arranged in the opening 42 and is compressed by a gland 44 to seal about the stem 46. A cap 45 is attached to the upper end of the head section 39 and has a. tubular part 46 extending downwardly through the opening 4|. Packing 41 is arranged in the tubular part 46 and a gland 48 is provided to maintain the packing under compression to'seal about the drill stem 46.
The drill head or driving head l2 includes a housing section 49 attached to the lower side of the section 39. The drill stem 40 passes downwardly through an opening 50 in the lower wall of the housing section 49 and a packing gland 51 is provided at the opening 50 for sealing about the drill stem. Means is provided for transmitting downward pressures or feed pressures from the head to the drill stem 40. A split sleeve or collar 52 surrounds the stem 46 and cooperates with the walls of a groove 53 in the stem. An anti-friction bearing 54 is arranged between the collar 52 and the lower face of the section 39 for transmitting longitudinal pressure between the head and drill stem 40.
The head I2 includes a transmission or drive for transmitting rotation from 'the power unit l4 to the drill stem 40. A shaft 55 is arranged in a plane at right angles to the plane of the longitudinal axis of the stem 40 and enters the housing section 49 through an opening 56. A packing gland 51 is provided in the opening 56 to seal The transmission or drive includes a worm 58 keyed on the shaft 55 within the housing section 49 meshing with a worm wheel 59 on the drill stem 40. Bearings 60 are provided at the opposite ends of the worm'58 to mount the shaft 55 in the housing section 49. In the preferred stru. ture illustrated the worm wheel 59 is attached to a hub 6| which is keyed on the drill stem 40. The underside of the hub 6| has a socket 62 and a bearing 63 is arranged in the socket to surround a bushing 65- on the drill stem 46. The upper end of the hub 6i may bear on the collar 52. The shaft 55 projects forwardly from the housing section 49to connect with the shaft of the power unit l4, as will be subsequently described. The housing section 49 may contain lubricant or grease for lubricating the several bearings and the worm gearing.
The drill I3 is connected with the lower end of the drill stem 40 to turn therewith. The invention contemplates the employment of drills of various characters on the drill stem. The particular drill l3 illustrated includes ahead disc 65 threaded on the lower portion of the stem 40 to bear upwardly against a flange 66. The body 61 of the drill I3 is tubular whereby the drill is adapted to receive a core or sample of the work W- The active or lower end of the drill body 61 is provided with cutting parts which may be in the nature of teeth 68. The lower portion of the drill stem 40 is preferably guided to steady and guide the drill I3. In the particular structure shown'in the drawings a guide 69 is attached to the column II and is removably attached to one of the frame members I I. The guide 69 has an opening I0 slidably receiving the drill stem 40 whereby the guide 69 centers and.
steadies the drill stem.
The inventio-nincludes means for guiding and stcadying the drill I3. The means for guiding the drill I3 includes ribs II on the upper side of the plate 3|. The ribs II are disposed radially with respect to the longitudinal axis of the drill I3 and have longitudinal channels I2. Blocks I4 are arranged in the channels I2 and have tongues I5 slidably fitting the grooves 13. The
blocks I4 are adjustable inwardly by screws 16 threaded through openings in the outer portions of the 'ribs I I. Rollers 11 are journaled in notches in the inner ends of the blocks I4 and are adapted to cooperate with the periphery of the drill I body 61. The blocks 14 are adapted to be locked or held in the adjustedpositions by screws or bolts I8 extending through longitudinal slots'I9 in the blocks. The means for guiding the drill just described may be easily adjusted to accommodate drills of different diameters by loosening the screws 18 and adjusting the blocks I4 to positions where their rollers 11 properly-contact the drill. The screws "I6 may aid the screws I8 in looking or retaining the blocks I4 in the adsleeve 35 to carry the engine I4 and its fuel tank 8|. The bracket has an annular part 82 surrounding the crank shaft or drive shaft '83 of the engine I4. The sleeve 36 has a complementary annular flange 84 opposing the annular part 82'. An internal rim 85 on the part 82 extends into and cooperates with a groove 88 in the flange 84. The engine shaft 83 projects through the openings in the annular part 82 and flange 84 and connects with the shaft 55. The shaft connection illustrated comprises a tongue 8! on the forward end of the shaft 55 fitting a slot 88 in the rear end of the engine shaft 83. A coupling 7 collar 89 may surround the adjacent connected endportions of the shafts.
In accordance with the invention the part 82 is connected with the flange 84 so that the engine I4 may be swung to different positions with respect to the column II to adapt the machine to drill into vertical and inclined walls, etc. with its The engine in its proper horizontalposition. flange 84 has an annular concentric slot 90 and the inner portion of the slot is enlarged or provided with grooves 9|. Bolts 92 are arranged in the slot 90 with their heads received in the grooves 9|. The bolts 92' project forwardly from the flange 84 to extend through spaced openings 93 in the annular part 82. Nuts 94 threaded on the bolts 92 clamp against the part 82 to normally rigidly connect the part with the flange 84 and thus rigidly connect the engine I4 with the sleeve :6. When it is desired to turn the engine I4 to a position where it will be upright when the machine is taking a sample from a vertical or inclined structure, the nuts 94 are loosened whereupon the power unit may be turned to the proper position, the bolts 92 moving through the annular slot 90 during such turning. Following the adjustment of the power unit I4 to its desired position the nuts 94 are tightened to lock it in place.
The means I5 for advancing or feeding the drill I3 into the work is operable to move the assembly of the sleeve 38, the head I2, the power unit I4 and the associated parts longitudinally on the column II andthus advance or retract the drill I3. The feed means I5 includes a-longitudinally disposed rack 95 attached to the column II. The rack 95 is preferably diametrically opposite the key 31 and may extend throughout the major portion of the column II. A transverse shaft 96 is rotatable inopenings 91" in the head section 39 and carries a pinion 98 which meshes with the rack 95. The opposite end portions of the shaft 96 project from the head section 39 and are polygonal for receiving an operating lever, an operating wheel or the like. In the drawings, I have shown an operating lever 99 removably arranged on one end portion of the pinion shaft 98 whereby the drill I3 may be manually advanced and retracted.
The invention contemplates arranging a pulley I00 on one end portion of the pinion shaft 96 andsecuring a feed-weight IN to a line I02 which operates over the pulley I00 to automatically feed the drill I3 into the work W. As the assembly of the sleeve 36, the head I2, the. drill I3, the power unit I4 and the related parts is comparatively heavy it is preferred to counterbalance or partially counterbalance its weight. The counterbalance means illustrated in the drawings includes a pulley I03 mounted on a cap 13 on the upper end. of the column II. A line I04 is con: nected to the sleeve 36 and is trained over the pulley I03 to pass downwardly into the upper end of the tubular column II. A weight I05 is attached to the lower end of the line I04 and is freely movable in the'tubular column I I to couning mechanism.
The means I6 is provided to circulate water or other suitable liquid to the drill I3 to cool the drill, carry the cuttings away from the drill and prevent sticking of the drill, and thus insure the cutting of a smooth core of uniform cross section. The circulation means I6 includes a container or tank I08 mounted in the forward portion of the trailer body 2i above the compartment 26. The weight of the tank I06 and its contents has its center of gravity spaced forwardly from the axle I8 so that the tank and the water counterbalance the weight of the drilling mechanism which is spaced rearwardly from. the axle I8. The circulation means I6 further includes a pump I91 mounted on the head section 39 by a bracket I08. The shaft I09 of the pump I01 passes through a gland III) on the housing section 49 and has its forward end connected with the shaft 55. In the case illustrated the pump shaft I09 has a tongue II I on its forward end received in a slot I I2 in the rear end of the shaft 55 whereby the pump shaft turns with the shaft 55. A flexible conduit or hose II3 carries the water from the lower end of the tank I06 to the intake I I4 of the pump I01. A high pressure'pipe or discharge pipe II5 extends from the discharge IIB of the pump to the fitting or cap 45. A nipple or coupling II'I connects the pipe H6 with the cap 45 so that the pipe discharges downwardly into the opening H8 of the tubular drill stem 40. A valve I I8 may be provided to control the discharge from the tank Hi5. The pump I is operable to draw or receive the water from the tank I06 and pass it under pressure into the upper end of the drill stem 40. The water discharges from the lower end of the drill stem opening H8 into the drill body 61 so that it cools the drill and flushes around the cutting teeth 68 to clear the annular cut of cuttings. A stop member or link I I9 is pivoted to the bracket 28. The link H9 is adapted to be swung upwardly to a'position where its upper end engages under the sleeve 36. When in such a position the link H9 supports the sleeve 36 and its associated parts against downward movement. When the link H9 is supporting the sleeve 36 and its associated parts the screw 30 may be loosened so that rotation of the pinion shaft 96 causes the cooperation of the pinion 98 with the rack 95 to move the column I I upwardly or downwardly. In this manner the column I I may be lowered to the position where the plate 3I engages the work and in a like manner may be retracted into the trailer when the machine is to be moved.
The trailer I 0 carrying the machine may be readily drawn or towed to the place where it is desired to obtain the sample. When it is desired to obtain a sample of the material of a road,.
street or the like the trailer I0 may be drawn or towed by a truck or automobile to the point where the sample is to be taken. The lack screws 23, the column II and the drill I3 are, of course, retracted into the trailer so that they do not interfere with its free movement while it is being towed. After the trailer It has been located at the position where the sample is to be taken the screws 23 may be threaded downwardly so that the heads 24 engage the surfaceof the road or work to steady the trailer I0 and hold it in the desired substantially horizontal position. The link I I 9, which may support the head I 2 and associated parts against movement during movement of the trailer I0, holds the head I2 against downward movement so that the pinion 98 may be rotated to feed the column I I downwardly and bring the plate against the surface of the work. The link I I 9 is released from the sleeve 36 and the screw or screws 30 are tightened to hold the column H in the operative position. The pinion shaft 96 is then turned to move the sleeve 36 and the connected parts downwardly to bring the active end of the drill I3 adjacent the surface of the road or in engagement with the road. The
blocks 14 may be adjusted to positions where their rollers 'I'I properly contact the periphery of the drill body 61.
" The power unit or engine I4 may then be started and the valve Ilil opened so that the drill I3 is rotated by the drive Jf the head I2 and the circulation'fiuid or water is. discharged into the drill. The cutting parts or teeth 38 the road or work W to-the desired extent the engine I4 may be out 01f or stopped. The hand lever 99 is then rotated to raise the sleeve 36 and its associated parts and thus retract the drill I3 from the bore or cut in the work W. The weight [05' counterbalances the drilling mechanism so that it is easily moved on the column II. 'The cylindrical portion or core C within the cut, made by the drill I3 may be broken free to provide or form a sample to be tested to determine the quality or character of the road or work. It is believed that it will be apparent how the machine carried by the trailer I0 may be easily moved from place to place as desired to obtain samples in the manner just described.
The drilling mechanism may be removed from the trailer Ill for the purpose of obtaining samples of vertical inclined or overhead work or structures. To disconnect the drilling mechanism from the trailer III the cap 28 is removed, whereupon the column II and the associated parts may be removed from therear of thetrailer. The hose I I3 is disconnected from the pump I01 before the removal of the mechanism from the trailer. Following the removal of the mechanism from the trailer I0 it may be set up in the desired position to take the sample.
Fig. 6 of the drawings illustrates the drilling mechanism operating to obtain a sample of a vertical partition or a wall X. When employed in this manner the column II is preferably at right angles to the face of the wall and in the case illustrated is substantially horizontal. In order that the power unit or engine I4 be in its proper upright position when the column II is horizontal the nuts 94 are loosened and the engine I4 is swung to the desired position and locked in place bytightening'the nuts 94. This shifting of the engine I4 is preferably done prior to or during the movement of the column II to its horizontal position. In the particular case shown in Fig. 5 of the drawings the engine I4 is disposed at substantially right angles to the column II, it being understood that it may be arranged at any other angles as conditions may require. The plate 3| is arranged against the face of the wall X and is secured thereto by screws I50 cooperating with expansion bolts ISI set in previously formed openings in the wall X.
The screws I rigidly attach the plate 3! to the wall X and the bolt 33 secures the column II to the plate. The blocks 14 may be adjusted to bring their rollers 11 in proper cooperation with the drill I3 as described above. Where a supply of water is present and when conditions require, a hoseor conduit I52 may be connected with the coupling H! to supply water to the drill I3. The machine operates as described above to make an annular cut or channel in the wall X so that a core or sample of the material of the wall X may be easily obtained. It is believed that it will be apparent how the machine may be employed to obtain samples from structures'in various positions. The drilling mechanism proper is easily removed from the trailer I0 and is easily replaced thereon for transportation from place to place.
Having described only a typical preferred form and application of my invention I do not wish to be limited or restricted to the specific details herein set forth, but wish to reserve to myself any variations or modifications that may appear to those skilled in the part, or may fall within thescope of the following claims.
Having described my invention, I claim:
accuse 1. A sample taking machine oi. the character described including a wheeled vehicle, a drilling mechanism comprising a drill, and means for operating the drill, means for detachably mountanism on the work for operation when detached from the vehicle.
2. A sample taking machine of the character described including a support member, a drill stem for carrying a sample taking drill, a drill head carried by the member for transmitting rotation to the stem, a wheeled vehicle, andmeans for detachably mounting the support member on the vehicle where the drill is operative whereby the drill may be operated with the support mem her on the vehicle and when the support member is removed'from the vehicle.
3. A sample taking machine of the character described including a wheeled vehicle, a guide, a drill 'stem for carrying a drill, a head shiitable onthe guide for transmitting rotation to the stem, 9. power unit associated with the head for rotating the stem and amember supporting the guide and detachably mounted on the vehicle whereby the drilling mechanism may be operated on the vehicle and when removed from the vehicle. I, 1
4. A sample taking machine of the character described including a wheeled vehicle, a guide on the vehicle, a drill stem for carrying a drill, a head shiftable on the guide for transmitting rotation to the stem, a power unit associated with the head for'rotating the stem, and means on the vehicle for cooperating with the work and the drill to stabilize the'drill.
5. A sample taking machine of the character described including a wheeled vehicle, a guide column, a drill stem, a head shiftable on the column and carrying the drill stem, 9. power unit associated with the head to move therewith, the head including means for transmitting rotation from the power unit tothe drill stem, means for feeding the head along the column, a portable member carrying the column, and means detach ably securing the member to the vehicle whereby' the drilling mechanism may be employed when on the vehicle and when-detached from the vehicle.
6. A sample taking machine of the character described including a wheeled vehicle, a guide column on the vehicle, a tubular stem ior carrying a sample taking drill, a head shiftable on the column and carrying the stem, means for rotating the stem, and means for circulating liquid through the stem to flush the drill, 'a portable member carrying the column, and means detachably securing the member to the vehicle whereby the drilling mechanism may be employed when on the vehicle and'when detached from the vehicle.
7. In a portable sample taking machine, a guide column, means for attaching the column to the part to be sampled, a head shiftable along the guide, a drill stem carried by the head for rotation and adapted to operate a drill, shiftable guide parts on said means. shiitable to positions to guide drills of difierent diameters, and a power unit associated with the head and operable to rotate the drill stem.
8. In a sample taking machine, a guide col- .umn, means for attaching the column to the part to be sampled, at head shiftable along the column, a drill stem carried by the head for rotation, means for advancing the head along the column to feed the drill stem toward the work, an engine for rotating the drill stem, and means adjustably connecting the engine with the head whereby the engine moves with the head and may be adjusted to an upright position when the column is in various positions.
9. In a machine for taking samples, a guide column, a head shiitable along the column, a drill stem carried by the head for rotation, means for advancing the head along the column to feed "the drill stem toward the work, a drill on the stem, an engine for rotating the stem, and means adjustably connecting the engine with the head whereby the engine may be arranged in a substantially upright position when the column is in various positions.
10. In a machine for taking samples, a guid column, a head shiitable along the column, a drill stem carried by the head for rotation, a drill on the stem, means for shifting the head along the columnto feed the drill relative to the work, a power unit tor rotating the stem having a shaft, means adjustably connecting the power unit with the head whereby the unit shifts along the column with the head and may be arranged in an upright position when the head is in various positions, and means holding the unit in its adjusted position with respect to the head.
11. In a sample taking machine, a guide column, means for rigidly attaching the column to the part to be sampled, a head shiitable along the guide column, a drill stem carried by the head for rotation, means carried by the head for rotating the stem, a drill on the stem, and means on the first mentioned means for guiding the drill including guide members on the first mentioned means shiftable to have guiding engagement with drills of various diameters.
i 12. A sample taking machine of the character mentioned including a guide column, a drill stem, a head shiftable along the column and carrying the stem for rotation, means for rotating the stem, a drill on the stem, a vehicle, means mounting the column on the vehicle so that it may be projected from its under side, and a plate for supporting the lower end of the column on the ing the lower end or the column on the work to be sampled,-and means on the plate for guiding the drill.
14. A sample taking machine of the character mentioned including a guide column, a drill stem, a head shiitable along the column and carrying the stern for rotation, means for rotating the stem, a drill on the stem, a vehicle, means mounting the column on the vehicle so that it may be projected from its under side, a plate for supporting the lower end of the column on the work to besampled, and means on the plate for guiding the drill, including rollers for engaging the drill, and means adjustably mounting the rollers on the block to guide drills of various sizes.
15. A sample taking machine of the character mentioned including a guide column, a drill stem, a head shiftable along the column and carrying the stem for rotation, means for rotating the stem, a drill on the stem, a vehicle, means mounting the column on the vehicle so thatit may be projected from its under side, the stem being substantially parallel with the column whereby the drill may act downwardly against the work to be sampled, and means for stabilizing the vehicle during operation of the device.
16. A drilling mechanism'of the character'described comprising, a column, means for rigidlysecuring the column to the work to be drilled, a H
rotary drilling head shii'table along the column, a drill rotated .by the head, means for advancing the head on the column under a uniform pressure to feed the drill relative to the work, and means on the first mentioned means ior guiding the drill.
i 17. A portable drilling mechanism of the character described comprising, a column,means for rigidly securing the column to the work to be drilled, a drilling head shiftable along the column, a drill rotated by the head, means for advancing the head on the column to feed the drill relative to the work, and means on the first mentioned meansjor guiding the drill including ace-gees column to the work, a head shiftable along the column, a rotatable drill stem carried by the head, means for shifting the head along the column to feed the drill stem relative to the work, an engine for rotating the drill stem, and means connecting the engine with the head for movement therewith and for fullrotary adjustment with respect thereto whereby the engine may be maintained in a substantially upright position when the head is in any rotative position with respect to the axis of the engine.
' FRANK-L. HOWARD.