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Патент USA US2109782

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March 1, 193s.
'
'E.-L_.ROSEEFAL
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2,109.782'
POWER TRANSMISSION
Filed Aug._ 25, 1936
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INVENTORS.
EDW/M L .IPosE
BY
Fksozwnr SHooomu
ATTORNEY
March 1, 1938.
E. L. ROSE ET -AL_
POWER TRANSMISSION
_
Filed Aug. 25, 1936 l
2,109,782
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INVENTORS
Bnwuv L. Ross 8
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ATTORNEY.
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‘March 1, 1938.
s. 1.. ROSE ET AL
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2,109,782
POWER TRANSMISSION
Filed Aug. 25, 1936
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INVENTORS
EDWIN L. Pass
BY
8
_
FIPEDEIPICIISI/ODGMAN
W X. M
_
ATTORNEY
v
2,109,782
Patented Mar. 1, 1938
UNITED STATES PATENT OFFICE
POWER TRANSMISSION
Edwin L; Rose, Watertown, Conn., and Frederick
S.’ Hodgman, Glen Rock, N. J., assignors to
The Waterbury Tool Company,
Waterbury,
Conn., a corporation of Connecticut
Application August 25, 1936, Serial No.‘ 97,792
19 Claims.
This invention relates to power transmissions
and particularly to transmissions of the'ihydrau
lic type comprising a ?uid pump and fluid motor
either or both of which may be provided with
5 >mechanism for varying its displacement in order
to vary the speed ratio between the prime mover
which operates the pump and the load device
which the motor operates; The invention is il
lustrated as adapted for use in a well drilling rig
10 of well-known type in which a string of drill stem
is caused to revolve by a rotary‘ drilling head while
a portion of the weight of the string rests upon
the earth formation at the bottom of the ‘hole
(Cl. 255—19)
,gine of the type used in motor vehicles which are
readily available at low cost. _
It is a/further object to provide a feed con
trolling apparatus for a well drilling rig wherein
‘a hydraulic variable speed power transmission is
incorporated for transmitting power between a
substantially constant speed prime mover and the
‘drawworks drum, whereby the speed of rotation
of the drum may be precisely controlled automat
ically to maintain a predetermined constant 10.
weight on the drill bit and whereby also the-oper
ation of the draw-works may be controlled manu
ally as desired to either raise or lower the drill
string at any speed within the power capacity
limits of the prime mover.
15
Further objects and advantages of the present
connected to a draw-works drum.
It is desirable’ in‘ such drilling operations to invention will be apparent from the following de
maintain at a constant valuethat portion of the scription, reference being had to the accompany-v
weightgof drill string which rests upon the earth ing drawings wherein a prefered form of the
20
20 formation at the bottom of the hole and to be present invention is clearly shown.
In the drawings:
able-to readily adjust such weight to diiferent
being drilled, the remainder being suspended on
1l_ a block and falls mounted in a drilling derrick and
values as different formations are encountered.
Various systems have been proposed for auto
matically regulating the weight on the drill stem
in such a manner.‘ Systems of this character as
heretofore constructed have utilized either the
energy of the drill stem itself for feeding the same
into the hole as required; such, for example, as
systems wherein a friction or ?uid brake is au
jtomatically regulated to’ maintain a constant
tension on the draw-works‘ drum, or have utilized
an expensive and cumbersome power operated
feed system such as a steam' or electric powered
Fig. 1 is a plan view partly in section of a well ‘
drilling rig showing a preferred form of the
present invention.
‘
Fig. 2 is a diagrammatic view of the hydraulic
circuits incorporated in the apparatus illustrated
in Fig. 1.
i
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'
' Fig. 3 is a vertical cross section on line 3—3 of
Fig. 1 showing a hydraulic transmission forming .
part of the apparatus.
'
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'30
Fig.‘ 4 is- a fragmentary detail of a portion of
the apparatus.
Referring now to Fig. 1 there is illustrated a
draw-works haw/ing a drum Ill journalled in bear
feed controlling apparatus. Devices of the latter ings
I 2 and adapted to have wound thereon a 35
class are not only expensive in ?rst cost and in l cable by which a drilling string may be sup
operation but are open to other objections in that "ported from a derrick, ‘not shown, in the usual
they require specially trained operators or are manner. The drum I0 is keyed to a shaft l4 on
incapable of use in ?elds where an adequate wate
which is 'spline'd a slidable clutch member it
4o supply is not available.
»
which may be engaged either with a worm wheel 40
It is an object of the present invention to pro- _ It as shown in‘ Fig. 1, or with a sprocket 20; The '
vide a well drilling rig whereby the weight of the sprocket 2ll_is driven from a counter shaft 22 by
drilling bit on the earth formation‘ at the bottom means of a sprocket 24 and chain 26. The shaft '
of the hole may be maintained at a constant but 22 is journalled in bearings 28 and 30 and has
keyed thereon a sprocket 32 which is driven by' 45
45 adjustable value and which incorporates sim
ple, ‘reliable and inexpensive apparatus capable of means of a chain 34 from a suitable prime mover,
operation in any locality by untrained operators. not shown, through the medium of any suitable
(A further object is to provide a well drilling rig multiple speed transmission mechanism. Splined
of this character including a;feed controlling de
50 vice which may be energized from a small prime
mover independently of the principal source'of
to the shaft 22 is a clutch member 36 slidable to
engage‘ a ‘sprocket 38 loosely journalled on the 50
shaft 22. ' Sprocket '38 drives by a'chain 40a
power for the draw-Works and other apparatus ‘ sprocket 42 loosely mounted on the shaft M, the
usually associated with drilling rigs of the rotary
sprocket 42 being rigidly secured to a sprocket 44
type and which small prime mover may prefer- ' :vénch drives a sprocket 45 by means of a chain
ably comprise a small internalcombustion en
55
2
2,109,782
The sprocket 44 is keyed to a shaft 48 which
carries a bevelpinion‘ 58 meshing with a bevel
ing a pivoting and sliding connection with the
differential piston I88 of the fluid-motor 18. The
gear on the under side of a rotary table 52, where ~ socket ring I88 is caused to revolve with the shaft
by the drill stem may be given a rotary movement 82 by a universal joint connection, not illustrated,
independent of the vertical movement imparted while the cylinder barrel I54 is keyed to the shaft
to it by the draw-works drum I8, as is well-known 82. The tilting box I 82 is mounted for oscilla
in the art. The apparatus thus far described is tory movement on its trunnions I88 in the casing
represented as typical of the usual well drilling I18 of pump 88.‘ When the tilting box I82 and
‘apparatus and, per se, forms no part of the pres
consequently the socket ring I88 are tilted about
10 ent invention.
»
.
.
the trunnion I88 and shaft 82 is caused to re 10
The worm wheel I8 is adapted to mesh with a volve, the pistons I58 are reciprocated in the
worm 54 which is splined to a shaft 58 forming bores I58 due to the inclination of the plane in ~'
the output shaft of a ?xed displacement rotary which the socket ring I88 rotates to the plane of
?uid motor 58. Motor 58 is hydraulically con; the cylinder barrel I54, the stroke of the pistons
15 nected to a variable displacement pump 88 to
I 58 being determined by the angular setting of 15'
form therewith a variable speed hydraulic trans
the tilting box I82. As the pistons I58 are re
mission which is illustrated as of the well-known ciprocated, ?uid is caused to be drawn into the
"‘Waterbury” type, shown in Fig. 3. The pump cylinders I58 throughv one arcuate port, not
88 has an input shaft 82 which is connected by shown, in the valve plate I12 and to be expelled
20 means of reduction gearing 84 to the crankshaft from the cylinders I58 through the opposite arcu 20
v vof an internal combustion engine prime mover
88. An auxiliary ?xed displacement pump 88 of
small capacity is driven from the reduction gear
ing 84 by gearing 18.
25
Referring now to Fig. 2, pump 88 has an outlet
conduit 12 which connects by means of a conduit
14 with the small cylinder 18 of a differential pis—
ton ?uid motor 18. The conduit 12 has branches <
88 and 82 communicating with ‘ports 84 and 88
30 of a pressure responsive pilot valve 88 and a
manually operable control valve 88 respectively.
The return side of the pump circuit includes a
return conduit 92 connected with an expansion
tank 94 as well as with the interior of the casings
35 of the pump 88 and the motor._58. Branches 88
and 98 communicate with ports I88 and I 82 of
the valves 88 and 88 respectively. Valve 88 has
a third port I84‘communicating by means of a
conduit I88 with a port I88 of a manually oper
40 able selector valve II8. while valve 88 similarly
has a third port II2 communicating by means of
a conduit II4 with a port II8 of the valve II8.
A third port “8 of the valve II8 communicates
by a conduit I28 with the large cylinder I22 of
45 the ?uid motor 18. A conduit I24 connects the
conduits .14 and I28 and has disposed therein a
check valve I28 opening toward the conduit".
The usual relief valve I28 is provided between the
outlet 12 and the inlet 82 of the pump 88 for the
50 purpose of limiting the pressure developed in the
‘ conduit 12.
The valve 88 includes a movable valve member
I38 which is secured at one end to a ?exible dia
phragm I32 forming a movable wall of a chamber
55 I34 formedgin the right-hand end of the body of
the valve 88.
A spring I38 abuts against the
opposite end of the member I38 and can be ad
_ justed by means of an adjusting screw I38. The
chamber I34 communicates by a conduit I48 with
60 a chamber I42 formed adjacent the end of the
worm 54. The latter carries at its right-hand
end a shaft‘ I44 with respect to which the worm
54 is free to rotate by means of ball bearings I48.
Theshaft I44 is secured to a ?exible diaphragm
65 I48 forming a movable wall of the chamber I42.
‘The conduit I48 includes a branch I58 leading to
a pressure gauge I52 for indicating the pressure
existingin the conduit “8.. > -
Referring now to Fig. 3 wherein the internal
ate port in valve plate I12.
‘
_
The ?uid motor 58 is similar in construction
to the pump 88 except that the socket ring I88’_
is joumalled in a ?xed angle box I82’ rigidly
secured to the casing I18’ of the motor 58. Fluid 25
delivered from the pump88 through the valve
plate I12 is'admitted to the cylinders of the motor
58 causing the socket ring I88 and the shaft 58
to revolve while on the return stroke of the pis
tons in the motor 58, the ?uid is returned to the 30
pump through the valve plate I12. Customary
replenishing and relief valves, not shown, are in
corporated in the valve plate I12 for the purpose
of maintaining the working circuit filled with
?uid at all times and for preventing building up 35
of excessive pressures and undue overloading of
the machine. The construction and operation of
hydraulic transmissions of this character are
well-known in the art so that further descrip—
tion thereof is unnecessary.
40
In operation assuming the drill, string to have
been run into the hole and the apparatus ar
ranged for drilling operation, the clutch member '
I8 having been adjusted to engage the worm gear
I8 as illustrated in Fig. 1, and the clutch mem 45
ber 38 having been adjusted to engage thersprock
et 38, the rotary table 52 is driven from the prin
cipal power source of the drilling rig through
chain 34, sprocket 32,‘shaft 22, clutch 38, sprocket
38, chain 48, sprockets 42 and 44, chain 48,
sprocket 45, shaft. 48 and 'bevel pinion 58. with
50
the prime mover 88 running at a substantially
constant speed, the shaft 58 will be caused to‘
turn at a speed determined by the position of the
tilting box I82 which is in turn governed by the
position of the differential piston I88. Fluid un
der pressure delivered by the auxiliary pump 88
is transmitted throughthe conduit 14 to urge
the piston I88 to the left in Fig. 2. The position
of the movable member I38 of the valve 8871s de
termined by the pressure, existing in the chamber
I34 which inturn is determined by the reactive
force exerted by the worm wheel I8 on the worm
. hssuming the cable to be wound on the drum
in a direction in Fig. 2, such that the weight of
the drill stem tends’ to turn the worm wheel I8
‘ counter-clockwise, this weight consequently urges '
the worm 54 to the right thus increasing the pres;
70 mechanism of the variable speed transmission is sure in the chambers I42 and I 34. Assuming that 70
illustrated; the pump 88 includes a revolving cyl- ' ' the operations are started with the drill bit sus
inder barrel I54 within, the bores I58 of which pended a short distance above the bottom of the
pistons I58 are re'ciprocated by the motion of a
socket ring I 88 which revolves in. a tilting box
75 I82. The tilting box I82 carries a stud I84 hav
hole, the full weight of the drill string will be im
posed on the draw-works drum I8 so that the
consequent thrust on the worm 54 overcomes the 75
2,109,782
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force of the spring I36, permitting the valve I30 - cylinders I22 and 16 respectively. Whenever the
to move to the left and completely opening a piston I66 is to the right of mid-position, that'is,
passage between the ports I00 and I04. The pis
whenever the d?iw-works drum is being driven ,
ton is thereby caused to move to the left under in a hoisting direction by the auxiliary prime
the ?uid pressure exerted in cylinder 16, the ?uid mover 66, if any failure of the prime mover 66 5
in cylinder I22 being exhausted through the con- . should occur, the pressure in conduit 14 will drop
duit I20, port “8, port I08, conduit I06,,ports I04 substantially to zero. Under these conditions
and I00 and conduit 96 to the return side of the
spring I16 moves the piston I66 .to the left to'\ '
system. The tilting box I62- thereby rotates in
mid-position, thus bringing the hydraulic trans
10 a counter-clockwise direction to the limit of its
movement causing shaft 56 to revolve in a direc
tion to rotate the worm wheel I8 and the drum
l0 counter-clockwise in Fig. 2, thus lowering the
drill string into the hole.
15
,
As soon as the drill bit touches the bottom of the
hole, a portion of the weight of the drill string
is supported on the earth so that the thrust of
the worm 54 to the right in Fig. 2 is reduced. As
‘soon as the reduced thrust reaches a value such
20 that the spring I36 can overcome the thrust of
mission to a safe position where the weight of 10
the drill string cannot cause the ?uid motor 58
to overhaul, even though the worm drive I8—54
be of the overhauling type. The check valve
I 26 permitsf?uid to pass from cylinder I22 to
the conduit 14 for this purpose. Obviously, if 15
the worm drive be of the non-overhauling type
this mechanism may be dispensed with.
If a failure of prime mover 66 should occur
while the .drill string is being fed‘ downwardly
during drilling operations, it is desirable to pre- 20
the worm 54, the movable valve member I30
vent continued turning of the table 52 so as to
moves to the right sufficiently to close the port
prevent a , “twist-off”.
I00. Should the rate of downward feed of the
drill stem be too great at this time, the ‘thrust
25 of the worm 54_is_ further reduced, thus permit
ting the valve member I30 to move further to
the right and open the port 84 to communicate
with the port I04. Fluid under pressure is there
For this purpose
the
clutch 36 has its operating lever I18 biased to)
the right in Fig. 4 by a spring I80‘and is held
in clutch engaging position by a latch I82. A 25
piston I 84mounted in a cylinder ' I86 ‘is biased
to the left by a spring I88 and connected to the
latch I82. The cylinder I66 is in communica
~ by admitted to the ‘cylinder I 22'through conduit tion with conduit 14 by a conduit I90. The con;
30 80, ports 84, and I04, conduit I06, ports I08 and
struction is such that the latch I82 is maintained
_ H8, and conduit .I20 causing the piston I66 tov in engagement with the lever I18 only when pres
move-to the right thus moving the tilting box I62 sure of a predetermined. magnitude exists in
in a direction to decrease the stroke of thepis
conduit 14; Whenever the pressure falls below
tons I58,
this point the latch I82 is tripped by the'spring .
35
As soon as the speed of the shaft 56 has been
reduced sufficiently so that the downward move
ment of the drill stem is equal to the rate at
which the drill bit “makes hole”, the thrust on the
worm will come to a balance with the thrust ex-l
erted by the spring I36, thus permitting the valve
I30 to move into the position shown in Fig. 2.‘
Thereafter the drill string will be fed downwardly
at the same rate so long as the bit "makes hole"
at the same speed. As soon as any change oc
45 .curs in the rate at which the bit “makes hole”,
I88 thus permitting spring I80 to disengage
clutch 36 and interrupt the rotation of table 52.
While the form of'embodiment of the inven
tion as herein disclosed, constitutes a preferred
form, it is to be understood that other forms
might be adopted, all coming within vthe scope '
of the claims which follow.
What is claimed is as follows:
.
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1. In a well drilling rig .the combination of a
drill string, a draw-works drum, a; prime mover,
a variable speed power transmission connected in
the thrust of the worm 54 correspondingly - driving relation between the prime mover and the
changes, causing the valve I 30 to make the re
draw-works drum, a controlling member mov
quired adjustments in the rate of feed of the able in accordance with variations' in torque im
"If for any reason, such as a failure of the prin
posed on the drum by the drill string, a motor
for varying the speed ratio -of the power trans
cipal power. supply of the drilling rig, it should
mission, and means whereby said controlling»
drill stem.
50
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be necessary or desirable to control the vertical
member may control operation of said motor.
movement of the drill string manually, the selec
2. In a well drilling rig the combination of a
tor valve I I0 is shifted to the right in Fig. '2, thus drill string, a draw-works drlim', aprime' mover,
55 connecting conduit I20 with the valve 80 through
a, variable speed power vtransmission connected, 5'
conduit H4.‘ The speed and direction of the in driving relation between the prime mover and
draw-works drum I0 may thereafter be con
the draw-works drum, a controlling member mov
trolled by operating the valve 90. Thusfif it is I able in accordance with variations in torque im
desired to decrease the speed in a downward direc
posed on ‘the drum by the drill string, a motor
60 tion or to increase the speed upwardly, the valve for varying the speed ratio of the power trans- ‘
60 will be moved to the right in Fig. 2, admitting mission, and means whereby. said controlling
?uid under pressure from the conduit 82, through
ports ‘86 and II2,'conduit II4, ports-H6 and H8,
conduit I20 to the cylinder I22. The piston I 66
member may control operation of said motor, and
additional manually controlled means for vary
ing the speed ratio of the power transmission
65 thereby moves to the right so long as valve 90 ‘ independently'of the controlling member.
is held to the right. Conversely, if the valve 90
3. In a well drilling7 rig the combination of a
is moved to the left, piston I66 moves to the left, ' drill string, a draw-works drum, a prime mover, .
exhausting ?uid from cylinder I 22 through con
a variable speed power transmission connected
duit I20, ports H8 and H6, conduit II4, ports ' in driving relation between the prime mover and
II 2 and I02, and conduit 98 to. the return side the draw-works drum, a controlling ,member
of the system.
movable in accordancewith variations in torque
4 If for any reason the auxiliary prime mover imposed on the ‘drum by the drill string, a motor
66 should fail, itis desirable to prevent damage
for'varying the speed ratio of the power trans
to the rig being caused thereby; For this pur
mission, meanswherebysaid controlling m‘em_
pose springs I14 and I16 are‘pr'ovided in 'the vber» may control operation or said motor, addi- 75
2,109,782
14
tional manually controlled means for varying
the speed ratio of the power transmission inde
pendently of the controlling member, and means
for selectively rendering the transmission subject
to control either by the controlling member or
by the manually controlled means.
4. In a well drilling rig the combination of a
drill string, a draw-works drum, a prime mover,
a variable’speed power transmission including a
10 variable displacement pump and a ?uid motor
operable thereby connected in driving relation
between the prime mover and the draw-works
drum, a controlling member movable in accord
ance with variations in torque imposed on the
drum by the drill string, a motor for varying
the speed ratio of the power transmission, and
means whereby said controlling member ,may
control operation of said motor.
5. In a well drilling rig the combination of a
20 drill string, a draw-works drum, a prime mover,
a variable speed power transmission including a
variable displacement pump and a ?uid motor
operable thereby connected in driving relation
between the prime mover and the draw-works
drum, a controlling member movable in accord
ance with variations in torque imposed on the
drum by the drill string, a, motor for varying the
speed ratio of the power transmission, means
whereby said controlling member may control
operation of said motor, and additional manually
controlled means for varyinglthe speed ratio of
the power transmission independently of the con
trolling member.
,
-
6. In a well drilling rig the combination of a
drill string, a draw-works drum, a prime mover,
a variable speed power transmission including
a variable displacement pump and a ?uid motor
operable thereby connected in driving relation
between the prime mover and the draw-works
drum, a controlling member movable in ‘accord
ance with variations in torque imposed on the
drum by the drill string, a motor for varying the
speed ratio of the power transmission, means
whereby said controlling member may control
its weight suspended by the draw-works drum.
9. In a well drilling rig the combination of a
drill string, a draw-works drum, a prime mover, '
a variable speed power transmission connected
in driving relation between the prime mover and
the draw-works drum, means responsive to varia
tions in torque imposed on the draw-works drum
for controlling the speed ratio of the power trans
mission to feed the drill string downwardly at
a rate to maintain a constant proportion of its 10
weight suspended by the draw-works drum, and
additional manually controlled means for vary
ing the speed ratio of the power transmission
independently of the torque imposed on the draw
works drum.
15
‘
10. In a well drilling rig the combination of
a drill string, a draw-works drum, a prime mover,
a variable speed power transmission connected
in driving relation between the prime mover and
the draw-works drum, means responsive to varia 20
tions in torque imposed on the draw-works drum
for controlling the speed ratio of the power trans
mission to feed the drill string .downwardly at I
a rate to maintain a constant proportion of its’
weight suspended by the draw-works drum, ad
ditional manually controlled means for varying
the speed ratio of the power transmission inde
pendently of the torque imposed on the draw
works drum, and means for selectively rendering
the power transmission subject to control either 80
by the torque responsive means or by the manu
ally controlled means.
'
a
,
'11. In a well drilling rig the combination of a
drill string, a draw-works drum; a prime mover,
a variable speed power transmission including 85
a variable displacement pump and a ?uid motor
operable thereby connected in driving relation be
tween the prime mover and the draw-works drum,
and meansv responsive to variations in torque
imposed on the draw-works drum for controlling 40
the speed ratio of the power transmission to
feed the drill string downwardly at a rate to
maintain a constant proportion of its weight sus
pended by the draw-works drum.
-
12. In a well drilling rig the combination of a 45
trolled means for varying the speed ratio of the drill string, a draw-works drum, a prime mover,
a variable speed power transmission including a
power transmission independently of the con
trolling member, andmeans for selectively ren- _ variable displacement pump and a ?uid motor
dering the transmission subject to control either operable thereby connected in driving relation
operation of said motor}additional manually con
by the controlling member or by the manually ‘ between the prime mover and the draw-works 50
drum, means responsive to variations in torque
controlled means.
,
.
'7. In a well drilling rig the combination of a imposed on the draw-works drum for controlling
drill string, a draw-works drum, a prime mover,
a variable speed power transmission connected
Cl Ol in driving relation between the prime mover and
the draw-works drum, additional means for driv
ing said draw-works drum independently of said
prime mover, a controlling member movable in
accordance with variations in torque imposed on
60 the drum by the drill string, a motor for varying
the speed ratio of the power transmission, means
whereby said controlling member may control
operation of said motor, and means for selec
tively connecting said draw-works drum to be
driveneither by the power transmission or, by
said additional driving means.
'8. Ina well drilling rig the combination of
a drill string, a draw-works drum, a prime mover,
a variable speed power transmission connected
in driving relation between the prime mover and
‘ the draw-works drum, and means responsive to
-‘variations in torque imposed on the draw-works
drum-for controlling the speed ratio of thepower
transmission to feed the drill string downwardly
.(15 ~‘at a rate tohmaint‘ain a constant proportion of
the speed ratio of the power transmission to feed
the drill string downwardly at a rate to main
tain a constant proportion of its weight suspended
by the draw-works drum, and additional manu
ally controlled means for varying the speed ratio
of the power transmission independently of the
torque imposed on the draw-works drum. '
13. In a well drilling rig the combination of a
drill string, a draw-works drum, a prime mover,v '
a variable speed power transmission including
a variable displacement pump and a ?uid motor
operable thereby connected in driving relation
between the prime mover and the-draw-works, 65
drum, means responsive to variations in torque
imposed on the draw-works drum for controlling
the speed ratio of the power transmission to feed
the drill string "downwardly at a rate to main
tain a constant proportion of its weight sus 70
pended by the draw-works drum, additional
manually controlled means for varying the speed
ratio of the power transmission independently
of the torque imposed on the draw-works drum,
and means for selectively rendering the power
B, 109,782
transmission subject to control either by the
torque responsive means or by the manually
controlled means.
'
14. In a well drilling rig the combination of a
drill string, a draw-works drum, a prime mover,
a variable speed power transmission connected
in driving relation between the prime mover and
the draw-works drum, a controlling member mov
able in accordance with variations in torque. im
10 posed on the drum by the drill string, a ?uid
motor for varying the speed ratio of the power
transmission, and means including a valve op
erably connected to said motor whereby said
controlling member may control operation of said
15 motor.
15. In a well drilling rig the combination of a
drill string, a draw-works drum, a prime mover,
a variable speed power transmission connected in
20
driving relation between the prime mover and the
draw-works drum,,a controlling member mov
able in accordance with variations in torque im
posed on the drum by the drill string, a ?uid
motor for varying the speed ratio of the power
transmission, means including a valve whereby
said controlling member may control operation
of said motor, and an additional manually oper
able valve for controlling the motor independent
ly of said controlling member.
16. In a well drilling rig the combination of a
30 drill string, a draw-works drum, a prime mover,
a variable speed power transmission connected
in driving relation between the prime mover and
the draw-works drum, a controlling member mov
able in accordance with variations in torque im
35 posed on the drum by the drill string, a ?uid mo
tor for varying the speed ratio of the power trans
mission, means including a valve whereby said
controlling member may control operation of said
motor, an additional manually operable valve for
40 controlling the motor independently of said con
trolling member, and a selector valve for man
ually rendering said motor responsive either to,
said ?rst valve or said second valve.
5 t
17. In a well drilling rig the combination of a
drill string, a draw-works drum, a prime mover,
a variable speed'power transmission connected in
driving relation between the prime mover and the
draw-works drum, a rotary table for. rotating said
drill string, means independent of said prime
mover for driving said rotary table, and means
responsive to variations in torque imposed on the
draw-works drum for controlling the speed ratio
of the power transmission to feed the drill string 10
'
downwardly at a rate to maintain a‘constant
proportion of its weight suspended by the draw
works drum, and means responsive to a failure
of said prime mover for stopping said rotary
table.
, '
.
18. In a well drilling rig the combination of a
drill string, a draw-works drum, a prime mover,
a variable speed power transmission connected in
is
driving relation between the prime mover and the
draw-works drum, means responsive to variations
in torque imposed on the draw-works drum for
controlling the speed ratio of the power transmis
sion to feed the drill string downwardly at a rate
to maintain a constant proportion of its weight
suspended by the draw-works drum, and means 25
responsive to a failure of said prime mover for
preventing said drill string from dropping into
the hole.
,
,
-
’
19. In a well drilling rig the combination of a
drill string, a draw-works drum, a prime mover, 30
a variable speed power transmission connected
in driving relation between the prime mover and
the draw-works drum, a. controlling member mov
able in accordance with variations in torque im
posed on the drum by the drill string, a ?uid 35
motor for varying the speed ratio of the power
transmission, means whereby said controlling
member may control operation of said motor, and
means e?‘ective upon failure of said prime mover
for bringing said power transmission to a drill‘ 40
string sustaining position.
'
EDWIN _L. ROSE.
FREDERICK S. HODGMAN
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