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Патент USA US2407681

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Sept. 17, 1946.
w. ’w. PAGET‘
DRILLING APPARATUS
Filed Dec. 21, 1942
2,407,679
3Sheets-Sheet 1
2,467,679
Patented Sept. 17, 1946
UNITED , STATES
PATENT OFFICE '
' YnniLLnvG APPARATUS
Win w. Paget, Michigan City, Ind., team to
Joy Manufacturing Company,‘ a corporation .of
" ‘
Pennsylvania
Application December 21, 1942, serial No. 469,646
6 Claims. (Cl. 255—45)
1
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‘drilling apparatus of the rotary type. ,
' l
2
>
,
‘
e_9 of Fig. 5, illustrating the torque-controlled
This invention relates to drilling apparatus,
and more particularly to, feeding means for a
valve means.
,
t
,
v
,
Fig. 10is an enlarged horizontal sectional View
6
‘It, is an object of‘ this invention to provide
taken on the line Ill-l0 of Fig. 1;
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1 ,
‘an improved drilling apparatus.’ It, is another
Fig. 11 is a fragmentary cross sectional view il
{object to provide improvedmeans for feeding
lustrating a modi?cation of the feeding means.
In the accompanying drawings there is shown
a‘ drilling-"apparatus; Still, another object is‘ to
a drilling apparatus, generally designated I, com
provide an improved fluid actuated feeding de
,vice for a drilling apparatusof the rotary type,
prisingbitrotating means, generally designated
said feeding device having means associated .10 2, feeding means, generally designated 3, and sup
porting‘and guiding means, generally designated
therewith for controlling the rate ofv feed of said
.drilling apparatus in accordance with the re
4.
The supporting and guiding means comprises
sistance-to ‘rotation, of the drill bit. Another
object is to provide‘improved feeding means, for
an elonated troughlike guide member 6 open at
a drilling apparatus, said feeding means includ 15 its lower side and having a swivel plate ‘I at its
upper side adapted to be secured in the saddle
ing ,aefluidactuatedimotor of the rotary type
having its rotor in threaded engagement with a
feed screw. ,Still another object is to provide a
‘?uid actuated motor ‘of the. rotary type ‘sup
ported for bodily movement with a drilling, ap
paratus and having its rotor in threaded engage
mentwith a feed screw, whereby a feeding of
the drilling apparatus is ‘obtained on relative
movement between said: rotor and; saidqfeed
screw. Other objects and advantages will ap
pear in the course of the following description.
mounting of a conventional rock drill support.
In the accompanying drawings, in which, for
motor is herein of the high speed electric, type
Formed along the sides of the guide member, as
shown in Fig. '7, are guideways 8 slidably re
ceiving ?anges in formed on a rear head member
I l of the bitrotating means 2 for supporting and
guiding the latter for movement relative to the
work.
The bit rotating means 2 includes a rotating
motor [2 carried by a control head 13 attached,
as by screws, to the rear head member II. The
and includes a casing l4 provided with front and
purposes of illustration, a drilling apparatus in
rear heads l5 and It held in assembled relation
which the illustrative. embodiment of my inven
tion is embodied is disclosed, together with a 30 with respect to the casing by usual tie bolts IT.
The motor is provided with ?eld windings l8 and
‘modification thereof:
,
,
.
an armature rotor I9, the latter having a shaft
Fig. 1 is aside elevational view of a drilling ap
paratus having my‘invention incorporated there
lm
,
,
Fig. 2 is a plan View of the drilling‘apparatus
4shown in Fig. 1.
1
Fig. 3 is a perspective view of a portion ofv the
drilling apparatus with parts broken away to
show the improved feeding» means.
' 'Fig. 5 is an enlarged fragmentary sectional
view taken in the plane of Fig.‘ 4 and showing
the feed control valve in ‘its forward feeding posi
I‘
.,
‘
‘
l
receiving the shank of a hollow drill rod 23 car
rying a drill bit 24. The rear motor head has a
cylindric projection 25 mounted for limited ro
tation in ball bearings 26 supported within a
' l3
":‘Fig‘. 4‘ is an enlarged vertical‘sectional view
"t'akenfon the plane of the line 4-4 of Fig; 2.
tion...
.35
20 which is journaled in bearings 2|, 2| suitably
supported in the motor heads. Attached to the
forward end of the shaft 20 is a chuck 22 for
'
‘
_ :Fig.‘ 6 is a view similar to Fig. 5 but showing
the feed control valve in its‘ reverse feeding posi
40 bore 21 formed in the control head l3. The bear
ings “are retained in the bore 21 by a retain
ing ring 29 secured, as by screws 30, to the con
trol head; and the cylindric projection is held
against axial displacement with respect to its
4.5 bearings by an end plate 32 secured, as by screws,
to the projection 25. Extending through a bore
in the shaft 20 is a liquid conducting tube 33
which is threaded at its rear end within a mem
ber 35 secured to the control head I3, and cleans
Fig.‘ 7 is an enlarged cross sectional view taken 50 ing liquid is‘supplied through a passage 35 in
‘substantially on the planes of the line 1-‘! of
the member 35 to the tube 33 where it is con
,Fig. 4. , I
l
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ducted to the hollow drill rod and through the
" ‘Fig. 8 is a fragmentary sectional view taken
latter to the drill hole. Electric energy may be
:‘on' the line,8lj—-8 of Fig. 10. '
‘ _
conducted to the motor i2 from any convenient
a; Fig. 3 is a vertical sectional viewtaken on line 255 source through a conventional connector plug
tion.
A
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2,407,679
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38 mounted on the control head [3 and connected
periphery of the rotor and-joined by surfaces
through wiring 39 to the motor, and a switch 40
is provided for effecting starting and stopping of
19 to the ends of the arcs ‘H to provide working
chambers 80. Formed in the head member II
and the cover plate (ii at the ends of the'cham
the motor, this switch being arranged in a cham
ber 4| formed in the control head, as shown in
Fig. 4,
' ber 60 are arcuate grooves '82, 82 and 83, 83 3
opening into the ends of the working chambers
'
80,: as’ shown in Fig. 7."_Whenoperating pres
The switch 45. is adapted to be actuated to its
closed position by a'diaphragm >42’ to whichliquid
sure" ?uid is supplied ‘to the working chambers
through the grooves 82; 82’ and' is vented from
43 under the control of a manually actuated 13 the working chambers through the grooves 83,‘
.83, the fluid acts on the vanes 14 to turn the
valve 45. Liquid is also supplied from thecham;
ber 43, Fig. 8, to a passage 46 commuhieating,v . ‘rotor in a counter-clockwise’ direction,‘as viewed
under the control of a manually operated valve
in Fig. 7, and effect a forward feed of the drill
48, with a passage 49 opening into‘ a groove'?'il ' ing-apparatus; When the grooves 82, 82 are con
in the head member H. The gr‘oove‘50' corn:
nected toilexh‘austi-and ?uid is supplied under
pressure to the working chambers through the
municates with the passage 36 leading to the
may be supplied at a pressure from a chamber
liquid conducting tube
shaft.
the motor power.
grooves 83', 83, the rotor is caused toturn in a '
clockwise direction and effect a rearward feed
It will be seen that in the absence of
liquid in the chamber @3 at theproper pressure;
the motor switch 46 will be opened so that drill-7
of the drilling apparatus. The adjacent ends of
20 the grooves 82, 83 within’ each of the working
ing will not take place withoutv an adequate sup
chambers are spaced apart a distance equal at
ply of cleansing liquid to the drill hole. The drill
least to the angular distance between a'p'air of
motor and its control means are similar to that
disclosed in my copendiiig application, Serial No.
adjacent vanes so as to'prevent _a- free passage
between the inlet-[and 'exhaus‘ti through-j‘which
operating ?uidmight pass through'the-motor .
Z_68;'792,’now Patent No. 2,288,541; granted June
30, 1945, and ‘further description-0'11" the same
without performing its working function, Any
herein is accordingly unnecessary’.
suitable means, such ‘as appropriately». arranged
_
_
‘ Referring to the drill feeding'means, it willébe
noted that there is provided "a feed ‘screw Mex
tending longitudinally " through the- troughlike
‘guide memberv ?‘in- parallelism "with the’. guide;
ways 8, and the feed screw is journaled at its
front and rear ends in plates’ 55 and 56 attached,
as by screws, to the ends of the guide member.
Fixed to the rear end of the feed screw is an op- .
erating handle 5'! whereby the feed- screw'may be
manually rotated to effect feed of‘ the ‘drilling
apparatus. Connected’ to‘ the‘ operating handle
and controlled'passagemeans in ther-otori; may
be' provided for'supplying' operating ?uid from
the working chambers to theig'rooves‘ 15 at the
inner 'ends of the‘ vanes 'M'so that the ?uid may
act on the vanes foril'iolding the latter'a'gain'st
the surface ‘E2 on the ring ‘F0; or any: otherssuit;
able ‘means ‘for maintaining the desiredprojec
tion of the vanes may‘ be used. Such devices,
being Well known in theartneed no illustration
here.
Operating ?uid for> thefeedl‘ motor
f
iis .. ‘supplied
“
51 is a locking plunger 5?’ adapted to ?t openings
from a connection 85' (Fig; 1) to the chamber 43
in the end plate 56 for locking’ the feed screw 40 through a strainer 86, vand‘this ?uid‘ isgdelivered
to the feed motor under the control of the valve
against rotation. Associated with'the feed screw
is a hydraulic feed motor, generally designated
45. The valve 45 slidably ?ts a valve‘ bushing
58, and having a rotor 59 threadedly engaging
88‘ arranged within the control head and is pro;
vided with a stem 89 projecting rearwardlyi
the feed screw and rotatably mounted as later
described. There is a'ohamber 60 formed within o. . through a sleeve shapedxmember 90 threaded into
the‘ head member I l ‘and opening through one
an openingin the control head. I At the ‘front and
Wallthereof. A cover plate 6| attached to the
rear ends of the valve bushing are chambers
head member H, as b‘y'screws 62-, closes the open
92 and 93 connected together-‘by a; groove‘94'
and communicating with exhaust’ through a’
passage 96. Sealing ‘rings 98 are. supported I
within the sleeve member 90 and sealingly en
gage-the valve stem 89‘ for preventing the es
cape of operating~ ?uid from the chamber 93
rearwardly along the valve stem. The rear end
of the valve stem is secured to an operating
handle 99 having an enlarged portion I l'09<_slid
ably '?tting‘ within the sleeve member 90 where
by the valve 45 ‘may be adjusted to any of its‘
end of the'chamber Bil, and. has a bore 63 pro
viding a bearing for a reduced end of the rotor ,
59. A bore 65 in the head' member ll‘ provides a
bearing for the other end of the rotor, this end
also being reduced. Surroundingthe reduced
ends of the rotor are packings 66 held in fluid.
‘tight engagement with the ends by sleeve shaped
members 58 attached to the head member II and
the cover plate 6 i, to prevent thev escape of liquid
from the chamber 60.
-
Arranged Within the chamber 66 is a ring
shaped member 10 surrounding the rotor 59 and
having an inner peripheral surface 12 which is
positions within the valve ‘bushing.
,
.
_7
Opening through‘ the valve bushing near the
rear end of the latter is a port llll‘ communicat
engaged by the outer‘ radial ends of vanes ‘M
ing with afpassage I02 in the control head 1 The
slidably mounted in slots 75 formed in the rotor
. passage I62 opens into a passage I03 extending
and extending longitudinally of the latter. The
surface 72 is shaped so as to provide two di-*
ametrically positioned arcs- ‘ll (Fig; 7) close to 65
the outer periphery of the rotor ands'ubstantially
‘port l0‘! for supplying operating ?uid-from the
‘concentric with the latter. The arcs ll extend
‘interior of the Valvev bushing to a groove 108
"through the head member ‘H to forked passages.
I04 and H35 (Fig. '7) opening into the grooves 83.
Near the forward end of the valve bushingpis‘a
which opens, as shown in Fig. 8, ‘into a forward
in a circumferential direction for a‘distance equal
at least to the angular distance between a pair 70 feed passage I99. Fluid supplied to the passage
W9 is conducted under the control of vajtorquer
of adjacent vanes so as to provide a continuous
seal preventing the flow of operating ?uid be
tween the rotorland the ring 10 along the arcs.
controlled valve,‘general1y designated Hi, to a
passage H2 opening; as‘sh'own'fingFig. ['7 into
The surface ‘E2 on the ring also has two diamet- I
branch passages I I3
lld'leading t‘o'the‘larl '
rically positioned arcsv l8 spaced from the outer ‘75 'cuate grooves 82 of‘the feed motor.” Formed in‘
2,407,679
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the'valve bushing between the ports ml and I0’!
is a port II6 connecting the supply chamber 43
to the interior of the bushing.
The valve 45
is provided with a reduced portion II'I between
its ends so as to form an annular space II8 be
.
passages I I3, I I4 opening into the arcuate grooves
82. The operating ?uid passes from the grooves
82 into the spaces between the vanes carried by
the rotor and acts against the vanes to turn the
rotor in a direction to effect feed of the drilling
apparatus in a forward direction along the feed
tween the inner surface of the valve bushing and
screw. ‘As the vanes pass over the arcuate
the reduced portion of the valve through which
grooves 83, 83, the fluid is discharged from the
?uid may pass from the port II6 to the port IOI
spaces between the vanes through the grooves
when the valve is in its most rearward position,
as shown in Fig. 6. Formed in the valve 45 are 10 83 to thebranch passages I04, I05 where it is
conducted to the passages I03 and I02 leading to
radial ports I20 and I2I opening into a cham
the space 93 at the rear end of the valve 45. The
ber within the valve for connecting the ports I I6
?uid is discharged from the space 93 through the
and I0‘! in the valve bushing in communication
groove 94 and the space 92 at the forward end‘
with each other when the ‘valve is in the position
of the valve bushing to the exhaust passage 96.
‘shown’ in Fig. 5. Opening through the valve
When the drill bit has been moved into engage
bushing in advance of the port I0‘! is a port I23
ment with the work, the operator then moves
communicating with a groove I24 for supplying
the valve 45 into its extreme forward position so
pressure fluid,‘ as shownin Fig. 10, to a passage
that operating ?uid may be delivered from the
I25 communicating past a manually controlled
supply chamber 43 through the ports I20, ‘I2I in
valve I26 with a passage leading to the diaphragm
the’valve to the groove I24 where it enters the
42 for the motor switch 40. When the valve 45
passages I25 and is conducted under the con- I
is in‘ its most forward position pressure ?uid is
trol of the manually operated valve I26 to the
supplied from the chamber 43 through the an
diaphragm 42 closing the switch 40 and start
nular space II8 surrounding the valve 45 to the
ing the drill motor. At the same time, ?uid is de
port I01, and is also supplied through the space
livered from the chamber 43 through the annular
H8, the ports I20, the chamber within the valve
space IIB surrounding the valve 45 to‘the groove
and the ports I2I to the port I23 in the valve
I08 Where it is delivered to the forward feed
bushing.
‘
passages for effecting the forward feed of the
i The torque-controlled valve III comprises, as
drilling apparatus during drilling.
‘ i
shown in Fig. 9; a valve sleeve I30 arranged with
in a transverse bore I3I in the control head. Ex
tending through the valve sleeve is a valve mem
' As long as the resistance to the rotation of the
drill bit does not exceed a predetermined value.
the
torque-controlled valve will remain’ open so
ber I32 having a valve portion I33 cooperating
that operating ?uid may flow to the feedmotor
with a valve‘ seat I34 at the junction of stepped
bores‘ I35 and I36- formed within the valve sleeve 35 for operating the latter to effect feeding of the
drilling apparatus‘in a forward direction.v When
‘for controlling the ?ow of operating ?uid from
the resistance to rotation of the drill bit exceeds
the forward feed passage I09 to the passage H2.
a predetermined value, the motor‘casing turns
The valve member I32 is threaded into a sleeve
and causes the pin I45 to force the torque-con
shaped member I40, and a spring I4I acts against
trolled valve toward its closed position against
40
the member I40 for urging the valve portion I33
the action of the spring I4I thereby reducing or
away from the valve seat I34. Formed in the
completely cutting off the flow of operating ?uid
sleeve shaped member I40 is an annular groove
to the feed motor 58.
‘
I
I43 for receiving a pin I45, Fig. 4, ?xed to the
If it is desired to feed the drilling apparatus
‘plate 32 at the rear end of the drill motor. Dur- _
in a rearward direction .the operator grasps the
ing the operation of the drill motor, the motor
operating handle 99 and moves the valve 45 into
casing tends to rotate in a direction opposite to
the
position shown in Fig. 6. At this time oper
the direction of rotation of the rotor. Since the
ating ?uid is delivered from the supply chamber
‘rear motor head I 6 is connected rigidly to the
43 through the annular space II8 surrounding
motor casing and the plate 32 is connected to the
the valve to the reverse feed passages‘ I02 and I03
rear motor head, there is a tendency to move the '
communicating with the arcuate grooves 83 of
‘pin I45 in a direction to force the valve member
the feed motor through branch passages I04 and
I32 toward its closed position against the action
I05. The ?uid entering the feed motor through
‘of spring I4I during operation of the drill motor.
the grooves 83 acts on the vanes 14 for rotating
'Spring MI is designed to hold the motor casing
against rotation when the resistance to rotation 55 the rotor of the feed motor in a direction to effect
of the drill bit is below a predetermined value.
'If the resistance to rotation of the drill bit ex
a reverse feed of the drilling apparatus along the
feed screw. As the vanes pass over the arcuate
grooves 82, the ?uid is discharged from the feed
ceeds the predetermined value, the valve member
motor to the branch passages I I3, I I4 where it is
I32 is moved toward its closed position for re
ducing or cutting off the ?ow of operating ?uid 60 conducted through the passage II2 past‘ the
torque-controlledvalve to the passage I09 and
through the forward feed passages to the feed
through the groove I08 and the port I01 in the
motor 58.
valve bushing to the space 92 where it is dis
The operation of the mechanism described
above is as follows.
To effect a feeding of the
charged to the exhaust passage 96.
'
The feeding of the drilling apparatus either in
aforward or rearward direction may be controlled
by rotating the feed screw manually through the
"99 for the valve 45 and moves the latter to the
operating handle 5‘! connected to the rear end
position shown in Fig. 5. Operating ?uid then
of the feed screw while operating ?uid is being
?ows from the supply chamber 43 through the
‘port H6 in the valve bushing and the ports I20, 70 supplied to the feed motor. By rotating the feed
screw in the direction in which the rotor of ‘the
I2I in the valve 45 to the port I0‘! opening into
feed motor is turning, the rate of feed of ‘the
the groove I08. Then ?uid is conducted through
drilling apparatus may be reduced, and an in
‘the groove I08 to the forward feed passage I09
creased rate of feed is theoretically obtained by
‘where it is conducted past the torque-controlled
lvalve I I I to the passage I I2 leading to the branch 75 rotating the feed screw in a direction opposite to
drilling apparatus toward the work by means of
the feed motor 58, the operator grasps the handle
2,407,679
7
that ‘of the rotor though, as a practical matter,
the rate of feedwill be likely to be as high already
as "is practicable,
_
i In a modi?cation of the invention shown in
Fig. 11, a feed motor, generally designated I48, is
provided with a rotor I49 threadedly engaging
the feed screw 54 and having teeth I5I around its
periphery meshing with teeth I52 around the pe
8
ing said drilling motor for movement relative to
its work, and means for feeding said drilling mo.
tor along said supporting ‘and guidingv meanspsaid
feeding means including a hydraulic feeding mo
tor having a rotor to which an operating liquid
is supplied under pressure, a feed element extend
ing axiallythrough said rotor and operatively en
gaging the latter, means for supplying an operat
' riphery 0f agrotor I53 supported on the head
ing liquidto said feeding motor, and means re
member I I for rotation on an axis parallel to the 10 sponsive to the torque load on said drillingmotor’
axis of the feed screw. Passages I55and I56 are
for controlling the supply of liquidto saidfeeding
provided in the head member II for supplying
motor.
,
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.7
and discharging operating ?uid relative to the
3.‘ In a drilling apparatus, a drillingmotor, of
rotors at opposite sides of their meshing portions,
the rotary type, means for supporting and, guid
the passages being connected selectively to supply
ing said drilling motor for movement relative-to
and exhaust under the control of the valve 45, as
its work, and means for feeding SaiddrillingmDi
in the preferred form of the invention. When
tor along said supporting and guiding means,.said
operating ?uid is supplied to the rotors through
feeding means including a feeding motor moreable bodily with said drilling motor and having a
in a counter-clockwise direction, as viewed in 20 ?uid actuated rotor, a feed screw extending ax
the passage I55, the rotor I49 is caused to rotate
Fig. 11, and effect a forward feeding of the drill
ing apparatus. As the rotors turn on their axes,
?uid supplied from the passage I55 is carried in
the spaces between the teeth of the rotors to
the passage I56 which will be connected to ex
haust. By supplying operating ?uid to the feed
motor through the passage I56v and discharging
the ?uid from the motor through the passage
I 55, the rotor I49 is caused to rotate in a direc
tion to effect a rearward feeding of the drilling
- ially through said rotor and in threadediengage
ment with the latter, means for rotating said feed
screw to‘ regulate the feeding of said drillingmo
tor during the operation of said feeding motor,
means for supplying operating ?uid to said feed
ing motor, and means responsive to the torque
load on said drilling motor for controlling the
supply of ?uid to said feeding motor.
'
4. In a drilling apparatus, the combination
comprising a drilling motor for rotating. a, drill
apparatus. The supply of liquid under pressure
bit, means for supporting andguiding said drill~
to the passage ‘I55 is regulated by a torque-con
ing motor for movement relative'to its’ work,
trolled valve as in the preferred form of the in-,
means for feeding said drilling motor along said
vention. By adjusting the valve 45 to trap liquid
supporting and guiding means, said feeding
in both the supply and discharge spaces of the 35 means including a ?uid actuated motor having a
motor, the rotor will be locked against rotation in
rotor subjected directly to the action ofuan op
either direction.
erating ?uid, a rotatable feed element extending
As a result of this invention it will be noted
axially through said rotor and operatively ‘end
that improved feeding means for a drilling ap
gaging the latter, said rotor and said feed element
par-atus have been ‘provided. The connection of 40 operating to effect feeding of said drilling motor
the rotor of the feed motor in threaded engage
ment with the feed screw makes a very compact
on relative rotation therebetweemmeans for con
trolling the rotation of said feed element, and
arrangement that is particularly adapted for
means responsive to the torque loads on said
feeding the drilling apparatus relative to the
drilling motor ‘for controlling the supply of op
work. Other advantages of‘ the invention will be 45 erating ?uid to said feeding motor. 7
' .
apparent to those skilled in the art.
5. In a drilling apparatus, the combination
While there are in this application speci?cally
comprising a drilling motor'for rotatingv a drill
described one form and a modi?cation thereof
which the invention may assume in practice, it
bit, means for supporting and guiding said drill
ing motor for movement relative ‘to its'w'ork,
will be understood that this form and modi?ca 50 means for feeding said drilling motor along said
tion of the same are shown for purposes of illus
supporting and guiding means, said feeding
tration and that-the invention may be further
means including ahydraulic motor having a ro
modi?ed and embodied in‘ various other forms
tor subjected directly to the action of an operat
without departing from its spirit or the scope of
ing liquid, a feed screw rotatably supported by
the appended claims.
What I claim as new and desire to secure by
Letters Patent is:
1. In a. drilling apparatus, a drilling motor of
55 said supporting and guiding means and extend.
ing axially through said rotor and in threaded
engagement with the latter, manually operated
means for rotating said feed screw, and means
the rotary type, means for supporting and guid
responsive to the torque loads On said drilling
ing said drilling motor for movement relative to 60 motor for controlling the supply of operating liq
its work, and means for feeding said drilling mo‘
uid to said feeding motor, said last mentioned
tor along said supporting and guiding means, said
means operative at a predetermined maximum
feeding means including a feed screw extending
load for cutting off the supply of operating liquid
longitudinally of said supporting and guiding
to said feeding motor.
'
.
means, a ?uid actuated feeding motor ?xed with 65
6. In a drilling apparatus, the combination
respect to said drilling motor as regards relative
comprising a drilling motor for rotating a drill
longitudinal movement and having a rotatable
bit, said motor including an element which pro
member directly subjected to the action of an op
vides the reaction necessaryfor the rotation of
erating ?uid and threadedly engaging said 'feed
screw, means for supplying operating ?uid to said
feeding motor, and means’responsive to the torque
load on said drilling motor for‘ controlling .the
supply of operating ?uid to said feeding motor.
-. .2. In a. drilling apparatus, a drilling motor of
the rotary type, means for supporting and‘guid- >
said drill bit, a motor support on which said mo
tor element is mounted for limited rotation rela
tive to said support and is normally held against
said relative rotation but is adapted when said
motor is overloaded to move relative to-said sup
port, feeding means for effecting feed of a drill
bit rotated by said drilling motor, 'said‘feeding
2,407,679
9
means including a ?uid actuated feeding motor
having a rotor subjected directly to the action
of an operating ?uid, a feed screw extending ax
ially through said rotor and in threaded engage
ment with the latter, and means responsive to
the loads on said drilling motor for controlling
10
the supply of operating ?uid to said ?uid actuated
feeding motor, said last mentioned means being
actuated by said motor element upon rotation
thereof relative to said motor support.
' WIN W. PAGET.
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