US1526976A

US1526976A - Well-drilling rig

Info

Publication number: US1526976A
Application number: US531264A
Authority: US
Inventors: Gregory William Sylvester
Original assignee: EVERETT B LATHAM; WM GREGORY CO
Current assignee: EVERETT B LATHAM; WM GREGORY CO
Priority date: 1922-01-23
Filing date: 1922-01-23
Publication date: 1925-02-17
Anticipated expiration: 1942-02-17

Description

F b, 17, 1925. q

w. s. GREGORY WELL DRILLING RIG Filed Jan. 23, 1922 PH 27 J... ......,,..n 22- 2' *5 iia "26 5,2 o

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IN VEN TOR. W17 Ii am sjlv'eszel Greya cy.

ATTORNEY.

5 Sheets-Sheet 1 W. S. GREGORY WELL DRILLING RIG jfz arney W. s. GREGORY WELL DRILLING RIG s sneefs 1 134 Filed Jan -Sheet 3 gwucnto'o W 9 M 0 w w w M m 0 W m [W n. W T 7 v a L 0 6 4 w w. s. GREGORY WELL DRILLING am y Filed Jan. 23,- 1922 s sheets-sheet 4 fjvm/vroze l/W/fam all/es! 6/1590.

Feb. 17; 1925. v 15262976- W. S. GREGORY WELL DRILLING RIG Filed Jan. 23, 1922 5 Sheets-Sheet 5 I N VEN TOR. W/fikun csjy/vesfer Gregg/y.

A TTORNE Y.

a my

| a QM E a W v m Patented Feb. i7,'1925.

UNITED STATES PATENT OFFICE.-

WILLIAM SYLVESTER GREGORY, 0F EAGLE ROCK, CALIFORNIA, ASSIGNOR OF ONE HALF T0 EVERETT B. LATHAM, 0! LOS ANGELES, CALIFORNIA, AND ONE-HALF T'O WM. GREGORY (30., 015 LOS ANGELES. CALIFORNIA, A COPARTNERSHIP COM- POSED OF W'M. S. GREGORY AND L. G. GREGORY.

WELL-DRILLING me.

Application filed January 23, 1922. Serial No. 531,264.-

To all whom it may concern:

Be it known that I, WILLIAM Sruvnsrnn (lnnoonr, a citizen of the Uni-ted States, and a resident of Eagle Rock, California, in the county ofLos Angcles and State f California, have invented new and useful Improvements in lVell-Drilling Rigs, of which the following is a specification.'-.

This invention relates to Well drilling and pertains more particularly to a rig for drilling by the rotary method.

My invention has for its rimary object the provision'of a light weight and practically portable drilling rig, particularly adapted to prospecting'for oil in non-proven fields; particular attentionbeinggiven to economy of fuel consumption, ease of operation and control by a minimum crew, elimination of accidents, such as twist-offs of the drill pipe, and otherwise surmounting obstacles incident to the isolated territories in which prospecting is done.

Up to the present. time, drilling and prospecting for oil has been almost; solely confined to proven fields, or fields'in which surface indications or other conditions point strongly to the possibilities of finding oil.

There exist, however, numerous localitiesin which geologists are of'the opinon that oil may be. foundbut in which, owing to the fact that all indications have beenerased, prospecting by present drilling equipment would prove extremely costly.

In drilling by the rotary method, a rotary bit or drill is aflixedto the cadet a pipe,

out or otherwise dispose of the drill pipe are successful, the hole must be abandoned.

In view of the above, 1t 1s another ob ect I of the invention to provide means in a drillhnown' as thev drill pipe, and is lowered to the bottom of the hole and rotated" by a rotary drilling table located at the surface.

The drill pipe is raised and lowered as ,re-

quired by means of a hoist, and'the hoist,

during drilling operations is so controlled that various percentages of the entire weight of the drill pipe are relieved from the bit according to the formation being drilled and the allowable rotative speed. In a rig without sufficient flexibility of control, the

drill pipe is apt-to become twisted off, be

driller has time to discontinuc'therotation of the drill pipe. Twist-oil's are extremely costly, inasmuch as some of the drill pipe is left in the hole, and uulessattempts to lislf' ing rig of the above character, whereby the tendencies for twist-offs to occur are practically eliminated, and whereby the rotative speed of the bit. and the weight upon it may be accurately controlled in accordance with the formation being drilled. It will be apparent that by so doing, drilling may be consistently expedited without fear or probability of twist-oil's, and obviously elimination of such accidents, and increased drilling speed result in decreased cost of drilling a hole.

In rotary drilling 'nocasingis required to line the hole under normal conditions, and

as a result rotary drilling is less costly than is drilling by cable tool methods; in which methods the hole is cased as it progresses to prevent caving in the sides of the Walls.

While rotary drilling, is known to be by far the most economical, it has failed in most localities when .used for drilling small wells, such as six inch bore. In drilling small bore wells the drill pipe is necessarily of small diameter, and present types of rigs are not sufficiently flexible to so control the speed and feed of the drill as'to prevent accidents.

It is therefore another object of the inventionto provide a rig particularly adapted to the drillingof small bore wells, and in carrying out'my invention I employ novel features which render the rig extremely "flexible and efiicient.

During "drilling operations, water is pumped down through the interior of the drill pipe .at a predetermined maintained pressure, and this Water escapes through holes drilled in the bit, so that it enters the -'hole in proximity to the cutting edges of the bit. .This water picksup the cuttings from the bit and carries them in suspension to the surface. The water with cuttings in suspension is knownin the art as mud, cause of the bit becoming lodged before the and is pumped intoa sump where it partially' settles, and from the sump it is again pumped into the drill pipe. Thus the cuttings ofthe bit are removed from the hole. and incidentally the walls of the hole are being continually plastered, so that tendency to caving in is eliminated without the use of casing. The ability ofwater to carry particles in mechanical suspension decreases controlled to maintain a given pressure and flow. The pressure and flow mustbe maintained practically constant regardless of the rate of drilling, inasmuch as a given velocity of returning water must be maintained in order to carry away the cuttings, regardless of increased or decreased amount thereof.

, meeting the above requirements, as to pump 3O torque, and is successful for operatingthe vention to provide a'drilling rig capable of pressure etc., independently of the rotative speed of the drill pipe, and independently of other factors.

i It will be understood in the consideraiion of the invention that heretofore stearii engines have been found to be the mostsatisfactory means for operating well'drilling rigs, and more than one separate engine is required. Usually an engine is used to operate the mud pump; another is used for operating the hoist; and for operating the rotary' As is well.

table to turn the drill pipe. known, a steam engine'has a wide range of rotary table and hoist, inasmuch as fullnormalload can be developed at reduced speed by increasing the cut-off of the engine.

My invention contemplates the use of internal combustion engines, preferably. The

internal combustion engine is best adaptedfor use in the oil fields, inasmuch as no steam boiler is required, and it may burn gas, distillate, gasoline, or crudeoil. Internal combustion engine power plants are therefore easily transported, are lower in first cost, and are generally adapted to use in oil fields or in isolated territories.

Inasmuch as the internal'combustion engine, however, will not develop full horsepower at reduced speed; is less flexible thana steam engine; and may bestalled by sudden increase in load, these engines have not been successful for use in driving rotary tables, hoists and the like. It is therefore another object of the' invention to provide a drilling rig which may be operated by internal combustion engines successfullywithout danger of stalling the engine or engines, and with rovision for meeting other requirements. or instance, occasions arise where it is advisable to impart increased torque to the drill pipe in order to make progress in hard formations. This may be readily done with a steam engine by increasing the cut-off, and in my improved rig I have made provision for imparting more than normal torque to the drill pipe while using internal combustion engines.

-cei'ved that numerous modifications of design and arrangement of parts may be emv output. of, the said two engines. It is therefore another object of the in-.

Other objects will appear hereinafter.

I have illustrated by the accompanying drawings a complete drilling rig, constructed in conformance with, and employing all the salient features of my invention. It is con-' ployed without departing fromthe spirit of, or enlarging the scope of my invention, within the appended claims.

In the said drawings. i

Figure 1, is a plan view of a drilling rig constructed in conformance with, and embodying all the salient features of the inveiition, I Figure 2-, is a view in section seen online 2-2 of .Fig. 1, looking in. the direction indicated by the arrows, and showing the well being drilled, in section. f

Figure 3, is a view mainly in vertical section of one of several clutches used in the rig. Figure 4, is a view in section of said clutch seen on 'a line 44 of Fig. 3, looking in the' direction of the arrows.

Figure 5, is a plan section of a the r1g known as a triple gear.

- Figure 6, is a view in section thereof seen on a line 6 6 of Fig.6,- looking in the direction indicated by the arrows.

Figure 7 is a plan view, parts being broken away, of a governor used in controllin the speed .of the power plant. 4

igure 8, is a plan VlQW IH elevation ofa preferred formof power plant.

Figure 9-, is a view thereof in section and elevation as seen on line 99 of Fig. 8, look- 11 in in the direction indicated by the arrows.

ore specifically, my improved drilling rig includes essentially arotary table 10, a hoist 11, mud pumps 12 and 13, and a single power plant 14 for driving the said table, hoist and pump.

s The power plant drives a power shaft 15, to which the rotary table, the hoist and the mud pumps arc-operatively connected to be driven thereby. The said power shaft drives 12; the rotary table through the medium of a set of bevel gears 16, and a universal shaft 17, provided with universal joints 18, whereby. the rotary table may bedisposed at a lower level than the main power shaft; the unipart of versal shaft extending at right angles to the main power shaft. Parts of the rig, with the exception of the rotary table, are here shown as supported by a unit fra1ne'19, made up of a plurality of I-

beams

20, 21,

22 etc.

Beams

21 and 22 extend parallell along the rig with the main power sha t which is intermediate of the said beams;

transverse braces 23, interconnecting the parallel beams may be employed for supporting bearings 24, for the power shaft.

A rotary table drive. shaft 25, carrying one of the bevel gears '16, is provided with a sprocket wheel 26,. and a corresponding sprocket wheel 27, is carried by the power;

shaft and is disposed adjacent the power shaft. -Mud pumps 12 and 13 are drlven'by a common drive shaft 28, which in turn carries a sprocket wheel 29. Said sprocketi a chain 32.

into a well 41, being drilled by the Drive shaft extends power shaft 15, but is spaced therefrom and disposed "intermediate of

beams

20 and 21. Other braces'33 interconnect beams 20 and 21, and support bearings 34 of said drive shaft. i

The mud pump drive shaft is provided with

clutches

35 and 36, whereby either or both pumps may be cut out of 0peration,.and it will be apparent that when the pumps are disconnected the power shaft may still continue to rotate the rotary table drive shaft.

The rotary table may be of any suitable design, but is here shown as inchu ing a circular plate 37 formed on the-under side with bevel gear teeth 37 and riding on ball bea r-. ings 38, carried on a base 39. Therotary table-is capable of otating a drill pipe 40,.

which is shown in ig; 2 as extending do yn r1". .the'lower cnd of the drill pipe is afixed rotary bit 41", which as it is turned by the drill pipe acts to bore deeper into the earth. The drill pipe is formed with an internal bore so that mud may be pumped down to the bottom of the hole to escape adjacent the bit.

To the upper end of the drill pipe is affixed a swivel 42; the lower, end 42' of which i is free to rotaterwith the drill pipe. The upper portion 43 of the swivel is ca able of remaining fixed'against rotation an is held by a cable 44., which passes up over a hoist block (not shown) carried at the top .of the usual derrick (not ,shoivn). A mud pump line 45 leads from themud pumps to a point. adjacent the forward part of the rig, and

parallel with a flexible hose 46 connects said mud line with the swivel to convey mud to the bore of the drill pipe. The means shown and above described for supporting the drill pipe by the hoist, and means for conveyinginud to the drill pipe as above set forth, are common to the art and need no further description.

Owing to the height to which the derrick extends, the cable is of considerable length,

and stretches considerably. It will heap-'- parent, therefore, that by proper control of the hoist the percentage of the weight of the drill pipe caused to be laced upon the bit may be accurately varied to conform to the rate at which it is desired to havbthe bit cut.

As a provision for safety and for other purposes hereinafter apparent, a special type of clutch 47, is interposed in the drive( shaft for the rotary table. Said clutch is hereinafter described more in detail as to construction and operation, and is capable of being set so that it will slip when a predetermined torque is reached or exceeded; Obviously,-by provision of such a clutch the possibility of twist-offs is eliminated.

The mud umps may be of any usual type, and prefera ly at least two pumps are employed. As a general rule usual, types of mud pumps arenon-reversiB-le. One pump -may be disconnected by throwing lever 48, which is operatively connected ,to and actuates clutch 35. The other pump may be disconnected-by throwing lever 49-, which act'u ates clutchf36., Thus either or both pumps Inc may beflused, but normally only one pump is used, and the other is held iureserve. I

It has been explained that the mud pumps must run at practically predetermined s eed, although it is necessary at times to a ter'the maintained speed. The drillpipes.

rotative speed has to .be changed repeatedly,

and in order that botlrmud pump and the rotary table'maybe operated 'by a common power plant. but at indepemlent speeds. I have provided a multiple speed transmission50 in the drive shaft of the rotary table. Any suitablie type of tran'smission mav be employed, and inasmuch as such devicesare in common use and well known. no detailed illustration or description is considered to be required. Inasmuch as it is necessary at times to rotate the drill pipe in a 'reverm direction; as in the case of unscrewing sections thereof,- it is advisable that the transmission be provided with the usual reversing mechanism. Transmission 50 iscontrolled by a gear shift 50f, which is here shown as being of the visible H tvpe. so that the drilllermay. know at a glance the position of the gears. The shift is disposed so as to be convenient to the operator, and is .operatively connected to the transmission by llU shown). ,1

To shift gears, the clutch in' the drive shaft is thrown out, and then thrown in after the gears have been shifted. It is well known that a clutch must be provided for use with a transmission of the above described type. and it will be seen that by providing a clutch capable of slipping at a given torque; said clutch serves a plurality of useful purposes. By throwing outvthe clutch'while the power shaft is running, the rotary table may be stopped without affect ing the operation of the pumps. v

The power plant may be of any suitable type, but in the embodiment shownand described, internal combustion engines are employed. While a single engine of this type.

might be used, my lnvention contemplates the use of a plurality of engines connected in a novel manner hereinafter set forth to provide a power plant of greater flexibility and economy.-

In the embodiment shown, three internal combustion engines, 51, 52 and 53, in cruciform arrangement are mounted onbeams 54, forming substantially a part of the frame of the rig.

By providing three engines capable of developing the maximum horse power reonly one engine will be required quired instead of using one engine, greater flexibility and economy results. Ordinarily two of the said engines will be sufiicient to operate the rig. When an extra heavy load is to be met the entire three engines may be used. In the case of a very li ht load y using two engines for usual conditions the third may be held in reserve in case repairs are required on either of the other engines.

Each engine is provided with a

shaft

51, 52 and 53", connecting with a triple gear transmission 54; whereby all engines may collectively drive the main power shaft. Engine 51 extends in alignment with the main power shaft and is capable of driving said power shaft direct. v

A hoist drive shaft 54' is PIOVldGd and is aligned with and connected to the main power shaft by a clutch 55. This clutch as in the case of clutch 47, is capable of slipping when a predetermined load is reached in order to prevent the hoist stalling the engine or engines driving it, as well as to prevent injury to the cable, etc. Intermediate of the clutch and hoist, a multiple gear transmission 56, is interposed in the hoist drive shaft. Said transmission is provided with a gear shift 57, disposed adjacent. shift 50', and connected to the transmission by proper arrangement of rods and links (not shown). The clutch is thrown out when it is required to change gears, and thus serves a dual purpose. .A sprocket wheel 58 is fixed. to the end of the hoist drive shaft in alignment with a sprocket 59 carried by a hoist drum 60; whereby the drive shaft ro- "may be employed to retard the speed of the drum; it being understood that in such a case the drum 1s thrown out of engagement from all driving parts by means of a hoist 0 clutch lever 63, acting on a hoist clutch (not shown) common to usual hoists. Obviously, any appreciable weight may be lowered with the hoistin operative connection with the main power shaft through the reverse position 0 the load on the cable will assist the power plant.

its transmission. In such case Other objects of the multiple speed trans-' missions provided, for both the rotary table and the hoist, will be apparent. when it is explained that it is primarily intended to run the engines of the power plant at constant and full speed under normal conditions so that a pump, or pumps, may operate at constant and full speed. By shifting gears in the transmissions either the hoist, or the table, or both may run each at speeds varying-with the pump, or at speeds varying with the pum and with each other.

iach engine 0 the power plant is controlled by a governor 64, of an usual type and notherein described in 'etail. Said governor, however, is provided with the usual oscillating shaft 65, as shownparticularly in Fig. 7. This shaft advances or is retracted a partial revolution by corresponding increase or decrease of the rotative speed of the engine. To the shaft 65 is attached an arm 66, which oscillates therewith. In this form of governor, as in all centrifugal governors, the weights (not shown) are resisted by .a spring 67, which in this case bears a ainst arm 66. .The tension of the spring determines the speed of the en ine by predetermining the speed 'at which t e centrifugal force of the governor weights will resist said sprin and move said arm. The arm is connected 69.

For manual control of the speed of the en ine, said spring is disposed within a circu ar housing, 70, which to a throttle 68 by a link is internally threaded to receive a threaded plun er 7 1,

which bearsa ainst the s ring. The p un er is provided with a sproc et wheel 72, which as 1t turns, advances or retracts the plunger chain 84, to turn the sprocket on the governor of the engine 52. Similarly, a bevel gear 85, on a shaft 86; having sprocket 87 and a chain 88, meshes with bevel gear 79, whereby-the sprocket wheel on the governor of engine 53 is actuated.

Thus all engines-are controlled simultaneously-as to their predetermined s eed. Now

it is well known that by manna ly controlling an engine through a centrifugal governor, the said engine will 'run at constant speed under variable load and will continue so as long as the load to which it is subject does not exceed the maximum horse power at the given speed. With the mud pump in operation the speed thereof will not vary with the starting and stopping of the rotary table and hoist. At any time the rotary table or hoist is put in operation it will immediately attain maximum speed. 7

Now it will be seen that by operating one,

two or three engines, as required, the power plant may operate at one-third, two-thirds, or full load with equal thermal efficiency, particularly inasmuch as the engine or engines running do not have to drag along the engines or engine not running under power.

As will be seen by reference to Fig. 5, the main power shaft 15 extends directly through the triple gear transmission, and

therefore engine 51 drives the power shaft directly. Engine 51 may be disconnected from the shaft by throwing a clutch 89, interposed in shaft 51. Shaft 52 is similarly equipped with a clutch 90, and likewise shaft 53 is equipped with a clutch 91. Clutches 89, and 91, respectively are operated by levers 92, 93 and 94,'respectively, which are disposed so asto be convenient to the operator of the rig. These levers are connected to their respective clutohesby rods and links (not shown). 7

The triple gear transmission 54, is designed to allowshaft 15 to rotate-without rotating 52' and 53. Referring now to Figs. 5 and 6, saldtransinission includes a housing 95 of cruciform outline, and formed with four extending bearings 96, for shafts 51-, 52 and 53;. Shaft 51 is formed with a spline 97 over which rides a sliding collar 98, forms with a rectangular recess 98. Said shaft carries a bevel gear 99 fixed thereto, and formed with a projecting dog 100,

which is capab e of e te i g the recess to 1 section 115.

cause said collar to become locked to the bevel gear andshaft 51'. The collar is operated by a shift fork 101, oscillated by v preferably the same in construetimi as

clutches

47 and 55. The last mentioned clutches are thrown by levers 106'and .107; respectlvely, through a plurality of rods and links (not shown).'

' In Figs. 3 and 4, I have shownoneof the said clutches more in detail. The clutch includes a drum 110, and a pair of

discs

111 and 112. Shaft 15, .on which this clutch is shown interposed is divided as at 113, into

sections

114 and 115. "Disc 112 is secured to section 114, by a key 116 which holds it against rotation. or lon itudinal movement thereon. .Drum is secured to section 115, by a key 117, and is provided with an integral collar 118 encompassing section of the shaft. With the clutch thrown out, section 115 and drum 110 will revolve, while section 114 and the disc may remain motionless. It is the purpose of the clutch to. bring drum 110 into frictional engagement with the discs, so that.

section 114 of the shaft will. be rotated by Drum 110 carries anannulus 119, of brake material, such as wood or other material having a high friction co efficient, and said annulus is reenforced by an inner annulus 120, of metal.

Discs

111 and 112 are cap-able of being retracted from each other, or advanced toward each other. It will be apparent that, with the discs advanced toward each other until they engage corresponding

surfaces

121 and 122. of annulus'119, section 115 will rotate section 114. Disc 111 is moved by worm gears 123, which are rotatably mounted on disc 112, and arefixed to rotatable shafts 124 passing through said disc and screw-threaded intodiso 112 as at 125. It will he apparent now that when gears 123 are rotated upon their, axes in one direction, disc 111 will be moved farther away from disc 112, and thus out of engagement with the annulus 119. Said gears are each rotated by a rack 126, formed with teeth 127, pitched at proper angle, whereby the rack upon sliding will slowly rotate the corresponding gear, but the gear will lock against the teeth when any force tends to advance-it. Thus while disc 112 may be moved easily by the sliding racks,it is incapable of movementv when the racks are stationary. Said. racks are carried by a shaft collar 128 slidably mounted on section 114, of the shaft. The racks ride into bores 129, formed within disc 112 and therefore said shaft collar is substantially a part of said disc and rotates therewith. The shaft collar is actuated by a clutch collar 130, loosely encompassing the shaft collar, and riding in an annular depression 131. Trunnions 132 are formed on the clutch collar, and are disposed 'in trunnion bearings 133,- formed in a pairof encompassing straps 134, joined as at135, to form a shift lever 136. The shift lever connects with its corresponding control lever, disposed conveniently to the operator of the rig.

.It willbe apparent that the clutch may be thrown in very gradually and may' be set at any desired point. The position at which it is set determines the pressure with which

discs

111 and 112 are clamped to annulus'119, and thereby the torque at which the clutch will slip is determined. The operation of the various parts of the rig being hereinbefore explained; the operation of the rig as a whole may be better understood from the following:

Engine 51 is first started, and with its clutch thrown in, it will drive the power shaft directly. Assuming the drill plpe is assembled and in the well and ready for drilling, it maybe rotated by throwin in the clutch which contrdls it. The clutc on one mud pump atleast is in at all times, and thus mud is ke t in circulation continually, as explaine The/transmission controlling the speed of the drill pipe,

is set in gear. The transmission controlling the speed of the hoist drum is set in any desired forward gear, but preferably in low gear, so that the drill pipe may be quite accurately controlled. It is understood of course that the weight of the drill pipe is held by the cable and the percentage of weight allowed to bear on the .drill'is governed by controlling the hoist drum,

preferably with the brake and the usual hoist-drum clutch common to such hoists. The clutch in thehoist drum shaft is left in during drilling. I I

The clutch in the rotary table-drive shaft is thrown in slowly, and set so that. it

i rotates the drill pipewithout slipping, but will slip when the load increases slightly.

The hoist is manipulated to. give the required feed to the drill and thus drilling is started. The driller generally knows from salm-ples taken, the feel of the rig,

. or from data on hand, the nature of .the

of the drill.

formation being drilled. Healso endeavors to keep track of decreasinglsharpness Should the clutch in the, ro

tary table drive shaft slip, he is aware that he is either encountering harder for- Jnation or' the drill isnot cutting properly.

' puttin i v .The drill may be raised slightly off the bottom of the hole, and lowered again to make sure it is properly positioned. If the clutch continues to slip it is set for a higher torque. If now, a hard formation has been reached and one en ine tends to slow down,

great a load on the drill for the speed. It

is now desired to decrease the rotative'speed. of the drill, while allowing the pumps to continue at full speed. This is done by fsecon or low. Should the clutch slip in low it will be necessary to relieve some of the weight from the drill pi e, inasmuch as slipping of the clutch, w en well set in, low gear, is an indication that a torque has been reached which it would be dangerous for the drill pipe to-exceed.

With the hoist transmission inlow, the cable may be very accurately controlled, while for fast raismg'of a light weight, a higher gear is employed.

The above description, illustrates the flexibility of the rig as a whole, but is not necessarily typical of all conditions. 'A wide range of combinations of speeds, feeds, pump pressures etc., may be obtained, and the 'manner of setting the clutches and gears, and otherwise control; ling and'feeling out the rig and the drilling conditions is practically optional with the driller.

It will be apparent, however, that the rotative speed of the pumps, hoist and rotary table, may be independently controlled. The speed at which one or more engines begin to slow down may be taken as a gauge;

the'rotary table transmission in or the point at which the clutches slip; with J consideration of the be taken as'a gauge. y In summarizing theadvantages of the rig it may be said that it is sufiiciently-flexible and sensitive to not only provide for faster drilling and greater fuel economy, but it gear ratio used, may

will enable ,one skilled in ,the art to feel i the bottom of the well, as it were. Also, one man maycontrol the feed and speed of the drill so as to increase the time which a drill ma be kept sharp.

It will e apparent that by the provision of a governor controlled prime mover for driving the rig, and by controlling'the" speed of thepower shaft-by controlling the governor; allparts willo erate at constant respective speeds regard ess of change in the load. When it- 1s known that one engine will carry the load, only one engine is put in operation. ,Should a clutch slip, or should more power he required on [short oil rapable of raising an notice, it is only necessary to operate two levers in conjunction; one to relieve the load for an instant, and the other to out in another engine.

' It will be apparent now that I have provided a drilling rig capable of carrying out the objects set forth, and possessing the advantages set forth, and while I have shown and described a specific construction and arrangement of parts, I do not limit myselftlieieto, but may alter the construe-- tion and arrangement of parts, and I ma salient features of my invention in a single operative, rig, as occasion requires, without departing from the spirit of, or enlarging the scope of my invention, within the appended claims. r a

, Iclaim; I

l. A well drilling rig, including a rotary table capable of rotatin a drill pipe, a hoist lowering the drill pipe, a mud pumping, device, a power shaft operatively connected to andcapable of rotating said rotary table, said hoist and said mud pumping device simultaneously, a multiple gear interposed between said rotary table and said power shaft, and another multiple gear interposed between said hoist and said power shaft.

2. A well'drilling rig, including a rotary table capable of rotating a drill pipe, a hoist capable of raising and lowering the drill pipe, a mud pumping device, a'power shaft operatively connected to and ca able of rotating said rotary table, said hoist and said mud pumping device simultaneously, and a multiple gear interposed between said rotary table and said power shaft.

A well drilling rig, including a rotary table capable of rotating a drill pipe, a hoist capable-of raising and lowering the drill pipe, a mud pumping device, a power shaft ope 'atively connected to, and capable of rotating said rotary table, said hoist and said mud pumping device simultaneously, and

a multiple gear interposed between said hoistand said power shaft.

-l. A'well drilling rig, including a rotary table capable of rotating a drill pipe. a hoist capable of raising and lowering the drill pipe, a mud pumping device, a power shat't operatively connected to and capable of rotating said rotary table, said hoist and said mud pumping device simultaneously, a multiple gear interposed between said rotary table and said power shaft, and another multiple gear interposed between said hoist and said power shaft; said multiple gears each having a plurality of forward speed positions, a neutral position and a reverse position.

5. A well drilling rig. including a rotary table capable of rotating a drill pipe,"a hoist capable of raising and lowering the hoist and said power shaft.

drill pipe, a mud pumping device, a power shaft operatively connected to and capable of rotating said rotary table, said hoist drill pipe, a 'mud pumping device, a power shaft operatively connected to and capable of rotating said rotary table, said hoistand said mud pumping device simultaneously,'and a. multiple gear interposed between said hoist and said power shaft; said multiple gear having a plurality of forward speed positions, a-neutral position and a reverse position.

y hoist capable of raising and lowering the variously combine all, or a part of all the 7. A well drilling-rig? including a rotary table capable of rotating a drill pipe, a hoist capable of raising and lowering said drill -pipe, a power shaft operatively connected to and capable of operating said rotary table and'said hoist simultaneously. a multiple gear interposed between said rotary table and said power shaft, and another multiple gear interposed between said.

8. A well drilling rig, including a rotary table capable/ of rotating a drill .pipe,v a hoist capable" of 'aising and lowering said drill pipe, at power shaft operatively connected to and capable of operating said rotary table and said hoist simultaneously. and amultiple gear interposed betwen said rotary table and said power shaft.

9. A well drilling rig, including a rotary table capable of rotating a drill pipe, a hoist capable of raising and lowering said drill pipe, a power shaft operatively connected to and capable of operating said rotary table and said hoist simultaneously, and a multiple gear inteqoosedbetween said hoist and said power shaft.

gears each having a pluralityof forward speed positions, a neutral position and a' reverse position.

11. A well drilling rig, including a rotary table capable of rotating a drill pipe, a hoist capable of raising anddowering said drill pipe, a. power shaft operatively connected to and capable of operating said rotary table and saidhoist simultaneously, and a multiple gear interposed between said rotary table and said power shaft; said multiple gear having a plurality of forward speed Positions, a neutral position and a reverse position.

12. A well drilling rig, including a rotary table capable of rotating a drill pipe, a hoist capable of raising-and lowering said drill pipe, a power shaft operatively connected to and capable .of operating said rotary table and said hoist simultaneously, and a multiplegear interposed'betwe'en said hoist and said power shaft; said multiple gear having a plurality of forward speed positions, a' neutral position and a reverse positio r a 13. A well drilling rig, including-a rotary table capable of rotating a drill pipe a hoist capable of raising and lowering t e drill pipe, a pumping device, a power shaft operatively connected to and capable of operating said table, said hoist and said pump simultaneously, a clutch interposed between said power shaft and said rotary table, a second clutch interposed between said power shaft and said hoist, and a third clutch interposed between said power shaft and said mud pumping device; each of said clutches being capable of slip ing when subject to a tor ue in.excess of t at predetermined.

14. A well drilling rig, including a rotary table capable of rotatin a drill pipe, 3. hoist capable of raising an lowering the drill pipe, a pumping device, a power shaft operatively connected to and capable of operating said table, said hoist and said pump simultaneously, and a clutch interposed between said power shaft and said rotary table; said clutch capable of slipping when' subject to a torque in excess of that predetermined.

15. A well drilling rig, includin table capable of r tating a drill hoist capable of iising and lowering the drill pipe, a pumping device, a power shaft operativel connected 'to and capable of opcrating sa1d table,-said hoist and said pump eratively connected to and capable of opsimultaneously, and a clutch interposed be tween said power shaft and said hoist;'said clutch capable of slipping when subject to a torque in excess of' that predetermined. I 16. A well drilling rig, including a rotary table capable of rotating a drill pipe ahoist capable of raising1 and lowering the drill pipe, a pumping evice, a power shaft opcrating said table, said hoist and said pump simultaneously, and a clutch interposed betweenv said power shaft and said pumping device; said clutch capable of slipping when subject to. a torque-in excess of that prede- "17. A well drilling rig, including a rotary table capable of rotating a drill pipega hoist 1 ject to ,a torque in excess of that a rotary P p capable of raisin and lowering the drill pipe, a power shat connected to and capale of operating said table and said hoist simultaneously, and a clutch interposed between said rotary table and said power shaft; said clutch capable of slipping when subject to a torque 1n excess of that pre- I determined.

19. In a well drilling rig, includin a rotary table capable of rotating a drill pipe, and an auxiliary power driven apparatus; a power shaft operatively connected to and capable of operating said table and said auxiliary simultaneously; and aelutch interposed between said power shaft and said table; said clutch capable of slipping when subject to a torque in excess of that predetermined. J

20. A well drilling rig, including a rotary table capable of rotating a drill pipe, a hoist capable of raising and lowering the drill pipe, a pumping device, a #power shaft operatively connected to and capable of operating said table, said hoistand said pump simultaneously, a clutch interposed.

between said power shaft, and said rotary table, a second. clutch interposed between said power shaft and said hoist, and a third clutch interposed between said power shaft and said pumpingv device; each of said clutches being capable of slipping when subredetermined, and adjusting means'opera le while said clutches are in-motion, whereby the torque at which they will slip may be predetermined. I

21. A well drilling rig,including a rotary table capable of rotating a drillpipe, a hoist capable of raising and lowering the drill {MP8, a pumping device, a power shaft operatlvely connected to and capable of operating said table, said hoist'and said pump simultaneously; and-a clutch interposed between said power? shaft and said rotary table; said clutch capable jof slipping'awhen subject to a torque 'in'excess of that predetermined, and adjusting means, operable when said clutch is in motion, whereby-the torque at which it will slip may-be predetermined.

22. A well drilling-rig, including a rotary table capable of rotating adrill pipe, a hoist capable of ;,raising and-lowering the drill pipe, a pumping device, a power shaft operativelyconnectedto and capable of operating', table, said hoistan'd said pump is in motion, where y the torq posedbetween said hoist and said power simultaneously, and aclutch interposed between said clutch capa le of sli ping when subject to a torque in excess of" t lat predetermined, and adjusting means, 0 ra-ble while said clutch ue at which it willslip may be predetermined. I

'23, A well drilling rig, including a rotary table capable of rotating a drill pipe, 'a hoist capable of raisin and lowering the drill pipe, a pumping evice, a power shaft operatively connected to and capable of operat-,

ing said table, said hoist and said pump simultaneously, and a clutch interposed between said device; sai clutch capable of sli ping when subject to a. torque in excesso that predetermined, and ad usting-means, operable, while said clutch is in motion, whereby the torque at which it willslip may be predetermined. s

24. A well drilling rig, including a rotary table capable of rotating a dril pipe, a hoist capable of raising and lower'ng the drill pipe, a power shaft operatively connected to and capable of operatingsaid table and said hoist simultaneously, and a clutch interposed between said rotarytable and said "powershaft; said clutch capable of sli ping when subject to a torque in excess 0 that predetermined, and adjusting means, operable while said clutch is in motion, whereby the torque at which it will slip may be pre determined. p

25. Awell drilling rig, including a rotary table capable of rotating adrill pipe, a hoist capable of raisin and lowering the drill pipe, a power sha t operativelyconnected to and'capable of operating said table and said hoist simultaneously, and a clutch inter shaft; said clutch capable of slipping when a subject to a torquein excessof that predetermined, and adju ting means, operable while said clutch is n motion,-wliereb the torque at which it will slip maybe pre etermined a 26. In a drilling rig,including a rotary v ta-ble capable of rotatmg a drill pipe, and

an auxiliary power driven apparatus, a power shaft operatively-conn'ected to and capable of operating said --table and said auxiliary simultaneously; and a clutch interposed between said power shaft and said table", said'clutch capable of slipping when subject to a torque in'excess of that predetermined,.and' adjusting means, operable while said clutch 'is in motion, whereby the-torque at which it will s'lip may be predetermined.

27. In a well drilling rig, including a. Y

rotary table, and a power'shaft for driving said table, a clutchinterposed between the power shaft and the rotary table; said clutch capable of slipping when a predetermined torque is exceeded.

ower shaft and said hoist; said ower-shaft and said pumping table capable of rotatmg a dnil 28. In a well drilling rig, including a rotal table, and a power shaft capable of rotating said table, a clutch interposed between said power shaft and said rotary table; said clutch capable of "sli ping when a. predetermined tor ue is egicee ed, and 'adjusting means opera le while said clutch is in motion, wjiereby the torque at which said clutch will s ip may be predetermined.

29. A well drilling rig, includin a rotary table capable of rotating a dri pipe, a power shaft operatively connected. to said rotary table, a clutch and a multiple gear a rotary pipe, a

rotary table, a clutch and a multiple gear shaft and said rotarytable in the order named; said clutch capable of slipping when a predetermined torque is exceeded, and ad,- justing means on said clutch operable while the clutch is in motion, whereby the torque at which the clutch will slip may be predetermined.

31. A well drillingrig, including a rotary pipe a hoist capable of raising and lowering said drill pipe, a;power shaft operatively connected toand ca able-of operating said hoist and said table simultaneously, a clutch and multiple gear transmission interposed between said power. shaft and said table in the order named, another clutch and another multiple gear interposed, betweeh said power shaft and said hoist 1n the order named; said clutches capable of slipping when a predetermined torque is ex'cee ed. 32. A well drillin rig, including a 1'0- -transmission interposed between said power tary table ca able 0 ,rotatingcadrill pipe,

a hoist capab' e of raising and lowering said drill necte (pipe, a power. shaft operatively conto and capable of operating said hoist and said table simultaneously, a clutch and multiple gear transmission inter osed be tween said power shaft and-sai table in the order named, another clutch and another multiple gear interposed between said power shaft and said hoist in the order named, said clutches capable of slipping when a Y redeterm-ined torque is exceeded, and "adusting means for each clutch wherebythe torqueat which they will slip maybe pre= determined; said means capable of operation while a clutch is in motion.

tary table capable of rotating a drill pi e,

a hoist capable of raising and lowering t e drill pipe, a mud pumping device, apower 33. A well drilling rig, includin a rosaid mud pumping device simultaneously, a multiple gearinterposed between said rotary table and said power shaft, and another multiple gear interposed between said hoist and said power shaft, and a governor controlled prime mover, whereby said mud pumping device may be operated at. constant spee in one direction regardless of the speed or direction in which said rotary table and said hoist are running.

34. A well drillin 'rig, including a rotary table capable o rotatin a drill pipe, a hoist capable of raising an lowering the drill pipe, a mud pumping device, a power shaft operatively connected to and capable of rotating said rotary table, said hoist and said mud pumping device simultaneously, and a multiple gear interposed between said rotary table and said power shaft, and a governor controlled prime mover, whereby said mud pumpin device may be operated at a constant spec in one direction regardless of the speed or direction in which. said rotary table and said hoist are running.

35. A well drilling rig, including a rotary table capable of rotatin a drill pipe, a hoist capable of raising an lowering the drill pipe, a mud pumping device, a power shaft operatively connected to and capable of rotating said rotary table, said ho1st and said mud pumping device simultaneously, and a multiple gear interposed between said hoist and said power shaft, and a governor controlled prime mover, whereby said mud pumping device may be operated at a constant speed in one direction regardless of the speed or direction in which said rotary table and said hoist are running.

36. A well drilling rig, including a rotary table capable of rotatin a drill pipe, a hoist capable of raising an "lowering the drill pipe, a mud pumping device, a power shaft operatively connected to and ca able of rotating said rotary table, said ho1st and said mud pumping device simultaneously, a multiple gear interposed between said rotary table and said power shaft, and another multiple gear interposedvbetween said hoist and said power haft; said multiple gears each having a plurality of forward speed positions, a neutral position and a reverse position, and a governor controlled rime mover, whereby said mud pumping evice may be operated at constant speed in one direction regardless of'the s eed or'direction in which said rotary tab e and said hoist are running.

37. A well drilling rig, includin a rotary table capable of rotating a dril pipe, a'

hoist capable of raising and lowering the drill pipe, a mud pumping device, a power shaft operatively connected to and capable of rotating said rotary table, said hoist and said mud pumping device simultaneously,-v and a multiple gear interposed between said said hoist are running.

38. A well drillin rig, including a rotary table capable'o rot-atin a drill pipe, a hoist capable'of raising an lowering the drill pipe, a mud pumping device, a power shaft operatively connected to and capable of rotating said rotary table, said hoist and said mud umping device simultaneously,

and a multiple gear interposed between saidhoist and said power shaft; said multiple gear having a plurality of forward speed positions, a neutral position and a reverse position, and a governor controlled prime mover; whereby said mud pumping device, may be operated at a constant speed in one direction regardless of the speed or direction in which said rotary table and said hoist are running.

39. A well drilling rig, including a rotary table capable of rotating'a drill pipe, a hoist capable of, raisin and lowering the drill pipe, a power sha operatively connected to and capable of operating said rotary table and said hoist simultaneously, a multi le gear interposed between said rotary ta le and said powershaft, and another multiple gear interposed between said hoist and said power shaft, and a governor controlled prime mover; whereby said. table mav be operated at maximum speed while saidhoist is running at less than maximum s eed, and whereby said hoist may be operate at maximum speed while said table is running at less than maximum speed.

40. A well drilling rig, including a rotary table capable of rotating a drill pipe, ahoist capable of raisin and lowering said drill pipe, a power 'sha ft operatively" connected to and capable of operating said rotary table and said hoist simultaneously, and a multip)le gear interposed between said rotary ta lo and said power shaft, and a governor controlled prime mover; whereby said table may be operated at maximum speed while said hoist is running less than maximum speed, and whereby said hoist may be operated at maximum speed while said table is runnin at less than maximum speed. i

41. well drilling rig, including a rotary table capable of rotating a drill pipe, a

hoist capable of raising and lowering said drill pipe, a power shaft operatively connected to and capable of operating said rotary table and said hoist simultaneously, and a multiple gear interposed between said hoist and said power shaft, and a governor controlled prime mover; whereby said table maybe ope-rated at maximum speed while said hoistis running at less than maximum speed, and whereby said hoi'st may be operated at maximum speed while the table is running at less than maximum speed.

42. A well drilling rig, including a rotary ta'ble capable of rotating a drill pipe, a hoist capable of raising and lowering said drill pipe, a power shaft operatively connected to and capable of operatingsaid rotary table and said hoist simultaneously, and a multis ple gear interposed between said hoist am said power shaft, and another multiple gear interposed between said rotary table and said power shaft; said multiple gears each having a plurality of forward speed positions, a neutral position and a reverse position, and a governor controlled pr me "mover; whereby said table maybe 0 erated at a maximum speed while the said oistis running at'less than maximum speed, and whereby said hoist may be operated at maznmum. speed while said table is runn ng at less than maximum speed.

43. A well drilling rig, including a rotary table capable of rotatinga drill pipe, a hoist .capable of raising and lowering said drill whereby said table may be operated at a maximum speed while said hoist is running at less than maximum speed, and whereby said hoist may be 0 erated at maximum speed while said table is running at less than maximum speed.

44, A well drilling rig, including a rotary table capable of rotating a drill-pipe,.a hoist capable of raising and lowering said drill pipe, a power shaft operatively connected to and capable of operating said rotary table and said hoist simultaneously, and a mul-.

tiple gear inter sedbetween said hoist and said power sha t, said multiple gear having a plurality of forward speed positions, a

"neutral position and a reverse position, and

a governor controlled prime mover, whereby said table may be operated at maximum speed while said hoist is running at less than maximum speed, and whereby said hoist may be operated at maximum speed while saidtable is running at les than maximum s eed.

45. A well drilling rig, including a rotary table capable of rotating a drill pipe, a hoist capable of raising an lowerin the drill pipe, a pumping device, a power s aft operatively connected to and capable of operat in-g said table, said hoist and said pump sim'ultaneously, a clutch interposed between said power shaft and said rotary table, a second clutch interposed between said power shaft and said hoist, and a third clutch interposed between said power shaft and said mud pumping device; each of said clutches being capable of slipping when subject to a torque in excess of that predetermined, and a governor controlled prime mover driving said power shaft; whereby tendency on the part of the rotary table, hoist or mud pumpmg device to stall the prime mover will be obviated.

46. A well drilling rig, including a re tary table capable of rotating a drill pipe, a hoist capable of raising and lowering the drill pipe, a pumpin device, a power shaft operatively connects to and capable of operatingsaid table, said hoist and said pump simultaneously, and a clutch interposed between said power shaft and said rotary table; said clutch capable of slipping when subject to a torque in excess of that predetermined, and a governor controlled prime mover for driving said power shaft; whereby a force acting to retard or stop will not stall the prime mover so that pump and hoist:1 may continue inoperation at usual spec 47. A well drilling rig, including a rotarytable capable of rotatin a drill pipe, ahoist capable of raising an lowering the drill pipe, a pumping device, a powershaft operatively connected to and capable of oper-'\ ating said table, said hoist and said pump simultaneously, and a clutch intcrposedbetween said wer shaft and said hoist; said clutch capa le of slipping when subjectto a torque in excess of that predetermined, and a governor controlled prlme mover for driving said power shaft; whereby a force acting on said hoist and tending to stall it will for drlvin said power shaft, w ereby stoppage of t e Inud pumping device will not stall the prime mover.

49. A well drilling rig, including a rotary capable of raisin and lowering the drill pipe, a power sha t operatively connected to and capable of operating said table and said hoist simultaneously, and a clutch interposed between said rotary table and said power shaft; said clutch capable of sli ping when subject to a torque in excess 0 that table capable of rotating a drill pipe, a hoist table; said'clutch capable of slipping when .subjectto a torque in excess of that predetermined, and a governor controlled prime mover for driving the power shaft whereby said auxiliary will continue to be driven by the prime mover should a force act to stop said drill pipe.

51. well drilling rig, including a rotary table capable of rotating a drill pipe, ahoist capable of raising and lowe ring the drill pipe, a pumping device, a power shaft operatively connected to and capable of'operating said table, said hoist and said pump s1- multaneously, a clutch interposed between.

said ower shaft and saidfrotary table, a secon clutch interposed between said power shaft and said hoist, and a third clutch interposed between said power shaft and said pumping device; each of said clutches being capable of slipping when subject to a torque "in excess of that predetermined, and adjust- 'ing means operable while said clutches are atively connected to and capable of operatin motion, whereby the torque at which they will slip may be predetermined, and a governor controlled prime mover for driving said shaft.

52. A well drilling rig, including a rotary table capable of rotating a drill pipe, ahoist capable of raising and lowering the (lllll pipe, a pumping device, a power shaft operatively connected to and capable of operating said table, said? hoist and said pump s1- multaneously, and a clutch interposed between said power shaft and said rotary table; said clutch capable of slipplng when subject toa torque in excess of that predetermined, and adjusting means, operable when said clutch is in motion, whereby the torque at which it will slip'may be redetermined, and a governor controlled prime mover for driving said shaft.

53. A well drilling rig, including a rotary table capable of'rotating a drill pipe, ahoist capable of raising and lowering the drill pipe, a pumping device, a power shaft opering said table, said hoist and said pump simultaneously, and a clutch interposed between said power shaft and said hoist; said clutch capable of slipping when subject to a torque in excess of that predetermined, and

of t

adjusting means, 0 erable while said clutch is in motion, where y the torque at which it will slip may be predetermined, and a governor controlled prime mover for driving said shaft. I

54. A well drilling ri including a rotary table capable of rotating a drill pipe, a hoist capable of raising and lowering the drill pipe, a pumping device, a power shaft operatively connected to and capable of operating said table, said hoist and said pump simultaneously, and a clutch interposed between said power shaft andsaid pumping device; said clutch capable of. slipbe determined, and a governor con-' a clutch interposed between said rotary table and said power shaft; said clutch capable of slipping when subject to a torque in excess of that predetermined, and adjusting means, operable while said clutch is in motion, whereby the torque at which it will slip may be predetermined, and a overnor controlled prime mover for 'drivlng said shaft. i Y

56. A well drilling rig. including a rotary table capable of rotating a drill pipe, a hoist capable ofv raising and lowering the drill pipe, a power shaft operatively connected to and capable of operating said table and said hoist simultaneously, and a clutch interposed between said hoist and said power shaft; said clutch capable of slipping when subject to a torque in excess at predetermined, and adjusting means, operable while said clutch is in motion, whereby the torque at which itv will slip may be predetermined, and a governor controlled prime mover for driving said shaft.

57 In a well drilling rig, including a rotagy table capable of rotating a drill pipe, an an auxiliarypower driven apparatus, a power shaft operatively connected to and capable of operating said table and said auxiliary simultaneously; and a clutch interposed between said ower shaft and said table;said clutch capable of slipping when subject to a torque in excess of that predetermined, and adjusting" means, operable when said clutch is in motion, whereby the torque at which it will slip maybe predetermined, and a govemorvcontrolled prime mover for driving said shaft.

58. In a well drilling ri includin a r0- tary table, and a power s aftfor iving said table, a clutch interposed between the power shaft and the rotary table; said clutch capable of slippin when a predetermined torque is exccede and a governor controlled prime mover driving said power shaft, whereby a force acting to stop said table will not stall said prime mover, and whereby twist-off of the drill pipe is prevented.

59. A well drilling rig, including a rotary table capable ofrotating a drill pipe, a power shaft operatively connected to said rotary table, a clutch and multiple gear transmission interposed between said power shaft and said rotary table in the, order named; said clut'ch capable of slipping when a predetermined torque is exceeded, and a governor controlled prime mover for driv ing said power shaft. v v

60. A well drilling rig, including a rotary [table capable of rotating a drill pipe,: a

power-shaft operatively connected to said vrotary. table,-a clutch and a multiple. gear transmission interposed between said power shaft and said rotary table in the order named; said clutch capable of slipping when a predetermined torque is exceeded, and adjusting means on said clutch operable while the clutch is in motion, whereby the torque I at which the clutch will slip may be predetermined, and a governor controlled prime mover for driving said shaft; all operable in the manner and for the purpose set.

forth. 1

61. A well drilling rig, including a rotary table capable of rotating a dril pipe, a hoist capable of raising and lowering said drill pipe, a power shaft operatively connected to and capable of operating said hoist and said table simultaneously, a clutch; and multiple gear transmission interposed between said power shaft and said table in the order named, another clutch.

and. another multiple gear interposed between said power shaft and said hoist in the order named; said clutches capable of slipping when a predetermined torque is exceeded, and a governor primemover driving said power shaft; all operating in the same manner and for the pur ose set forth.

62. A well drilling rig, including arotary table capableof rotating a drill pipe, a hoist capable of raising and lowering saiddrill pipe, a power sha operatively connected to andcapable of operating said hoist and said table simultaneously, a clutch and multiple gear transmission. interposed between said power shaft and said table in the order named, another clutch and another multiple gear transmission interposed between said power shaft and said hoist; in the order named; said clutches capable of slipping when a predetermined torque is exoeede,

and adjusting means for each clutch whereby the torque at which they will slip may be predetermined; said means capable of operation while a clutch s m motion, and a governor controlledprime mover for driving said shaft; all operating in the manner and for the purpose set forth.

- 63. A well drilling rig, including a. rotary talble capable of rotating a drill pipe, a hoist capable of' raising and lowering the drill pipe, a mud pumping device, a power shaft operatively connected to and capable of drivlng said table, hoist and mud pumping device, a governor controlled prime mover for driving said power shaft,.a multiple gear "transmission interposed between said rotary table and said -power shaft," manually operated control. means actingon said governor to vary the speed of the prime mover regardless of the load.

64. A well drilling rig, including a rotary table capable of rotating a drill pipe, a hoist capable of raising and lowering the drill ernor controlled prime mover for drivingsaid power shaft, a multiple gear transmission interposed between said power shaft and said rotary table, and manually controlled means operating on said governor to vary the speed of the prime mover.

65. A well drilling rig, [including a rotary tahlerapable of rotating a drillpipe, a ho st capable of raising and .lowering'the drill pipe, amud pumping device, a power shaft operatively connected to and capable of operating 'said rotary table, s'aid hoist and said mud pumping device simultaneously,"a governor controlled prime -mover for driving said power shaft, a multiple gear transmission interposed between said power shaft and said rotary table, manually controlled meansoperating on said governor to vary the speed of the prime mover, and a multiple gear transmission interposed between said power shaft and said hoist.

66. A well drilling rig, ingluding a, rotarytable capable of rotating a drill pipe, a hoist capable of raising and lowering said drill pipe, a power shaft operatively connected to and capable of driving said table and said hoist, a'multiple gear transmission and a clutch interposed between said table and said power shaft, said clutch capable of slip ping when a predetermined torque is exceeded, a governor controlled prime mover for driving said power shaft, and manually operated control means acting on said governor to vary the speed of said power shaft.

67. A wellv drilling rig, includinga rotary table capable of rotating a drill pipe, a mud pumping device a power. shaftfloperatively connected to arid capable, of driving said pumpingdevice End said table simultaneously, a clutch interposed betweensaid table capable of rotating a drill pipe, a mud pumping device, a power shaft operatively connected to and capable of .driving said pumping device and said table simulta neously, a clutch interposed between said power shaft and said rotary table, a governor controlled prime mover for driving said power shaft, manually controlled means acting on said governor to vary the speed of said power shaft, a multiple gear transmission interposed between said clutch and said power shaft; said clutch capable of slipping when a. predetermined torque is exceeded.

69-. A well drilling rig, including a rotary table capable of rotating a drill pipe, a power shaft'operatively connected to and capable of driving said rotary table, a plurality of governor controlled prime movers for driving said power shaft, clutches interposed between each of said prime movers, whereby any or all of said prime movers may be caused to drive said shaft or be de-clutched from operative connection therewith at the will of the operator of the rig.

70. A well drilling rig, including a rotary table capable of rotating a drill pipe, a power shaft operatively connected to and capable of driving said rotary table, a. plurality of governor controlled prime movers for driving said power shaft, clutches interposed between each ofsaid prime movers, whereby any or all of said prime movers may be;

caused to drive said shaft or be de-clutched from operative connection therewith at the .er shaft operatively connected to and capable of driving said rotary table, a multiple gear transmission for said rotary table, a

plurality of governor controlled prime movers for driving said power shaft, clutches interposed between each of saidprime movers said power shaft, whereby any or all of said prime movers may be causedto drive said shaft or be de-clutched from operative, connection therewith at the will of the operator of the rig, a speed governor for each prime mover, and,v means for collectively acting on said governor to vary the speed of the prime mover then running.

7 2. A well drilling rig, including a rotary table capable of rotating a drill pipe, 2. hoist capable of raising and lowering a drill pipe, a power shaft operatively connected to and capable of driving said. rotary table, and

pipe, a power shaft operatively connected to' and capable of driving said rotary table, and said hoist, a plurality of governor controlled prime movers for driving said power shaft, clutches interposed between, each of said prime movers and said power shaft, where by any or all of said prime movers may be caused to drive said shaft or be de-clutched from operative connection therewith at the will of the operator of the rig, a speed governor for each prime mover, and means for collectively acting on said governors to vary the speed of the prime movers then running.

74. A well drilling rig, including a rotary table capable of rotating a drill pipe, a hoist capable of raising and lowering a drill pipe,

a power shaft operatively connected to and hoist, a multiple gear transmission for said hoist, a plurality of governor controlled prime movers for driving said power shaft, clutches interposed between each of said prime movers and said power shaft, whereby any or all of said prime movers may be caused to drive said shaft or be de-clutched from operative connection therewith at the will of the operator of therig, a speed governor for each prime mover, and means for collectively, acting on said governors to vary the speed of the prime movers then running.

7 A well drilling rig, including a rotary table capable of rotating a drill pipe, a power shaft operatively connected to and capable of driving said rotary table, clutches interposed between said power shaft and said table, a plurality of governor controlled prime movers fol-driving said power shaft, and clutches interposed between each of said prime movers and said power shaft whereby any or all of, said prime movers may be caused to drive said shaft or be de-clutched d table, a plurality of {governor controlled prime movers for driving said power shaft, clutches interposed between each of said prime movers and said power shaft wherey any or all of said prime movers may be caused to' drive said shaft or be de-clutched table and said hoist, a clutch interposed be j negative.

from operative connection therewith at the will of the operator of the rig, a speed gov ernor for each prime mover, and means for collectively acting on said governors to vary the speed of the prime movers then running.

77. A well drilling rig, including a rotary table capable of rotating a drill pipe, a hoist capable of raising and lowering said drill pipe, apower shaft'operatively connected to and capable of driving said rotary tween said power shaft and said table, and

a clutch interposed betweensaid power shaft and said hoist, a multiple gear trans- ,mission for said rotary table, va multiple gear transmission for said hoist, a plurality of governor controlled prime movers for driving said power shaft, clutches interposed between each of said prime movers shaft operativelyconnected to and capable of driving said rotary table,- said hoist and said mud pumping device, a clutch-interposed between said power shaftand said table, a second clutch interposed between said power shaft and said hoist, and another clutch interposed between said power shaft .and said mud pumping device, a" multiple gear transmission for said rotary table, a

'multiple gear-transmission for said holst,

- a governor controlled prime mover for driving said power shaft, clutches interposed between each of said prime movers andsaid power shaft whereby any ,or all of said prime 'n'ioversmiay be caused to drive said shaft or be. de-c'lutched from operative con-- nection therewith at the will of the operator of the rig, a speedgovernorfor each. prime and ineans for collectively acting e of raising and lowering said I the a like, including a plurality of prime movers,a power shaft one of said prime. movers extending in longitudinal alignment with said power shaft, the other of' said prime movers radially disposed with the first of said prime movers about a common center, and means for selectively connecting or disconnecting one or more of said engines with said shaft.

81. A power plant for drilling rigs and the like, including three prime movers, one i of said prime movers in alignment with and capable of driving said power shaft directly, a bevel gear carried on said power shaft; the other of said prime movers disposed at right angles to and on either side of said power shaft, a bevel gear driven by each of said other'two prime movers, and

meshing with --the ,bevel gear on saidpower shaft and a clutch for each of said prime movers disposed between it gear. L

82. A power plant for drilling 'rigs and the' like, including a plurality of engines, a power shaft, and means for selectively and its bevel I connecting one or more of said engines to" said power shaft, a speed governor on each engine, and means for controlling all governors jointly." 7 83. A powerlant for drillin'grigs and the like, inclutii movers, one of said prime movers extending in longitudinal alignment with said power shaft, the other of said prime movers radially disposed with the first of said prime,

ng a plurality of prime,

movers about a common center, and meansfor selectively connecting or disconnecting one or more of said prime movers with said shaft, 'a speed governor on each prime mover, and means for; controlling all govern} ors jointly. y a

84. A power plant for drilling 'rigs and the like, including three prime movers, one

of said prime movers in alignment with and capable of driving said power shaft di- .rectly, a bevel-gearfcarried on said,power on said governors to vary the speed of the.

prime moversthen running,

*9, A power plentk fl 'd find' at like, including a.,plu1'ality of engines,

said power shaft;

i 80. A power plant for drilling rigs and a' power shaft, andmeans for selectively connecting one or inore ofsa d engines to jointly. a

S E TG E O shaft; the? other of said prime movers disposed at'right angles to and on either side 5 of said power shaft, a bevel gear driven by each of said other two prime movers, and

meshing with the bevel gear on said power shaft, and a clutch for each of said prime movers disposed between it and its'bevel gear,'a speed governor on each rime-mover and means for controlling. a governors WILLIAM, SYLV