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Патент USA US2127108

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Aug. 16, 1938.
D. |_. DRISCCSLL
2,127,108
WELL DRILLING APPARATUS
Filed March 4, 1936
4 Sheets-Sheet l
H16 Hilary
Aug. 16, 1938.
D_ .|__' DRISCOLL
_
2,127,108
WELL DRILLING APPARATUS
Filed March 4, 1936
..
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4 Sheéts-Sheet 2
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Aug. 16, 1938.
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' D. L. DRISCOLL ,
2,127,108 ~
WELL DRILLING APPARATUS
Filed March 4, 1936
4 Sheets-Sheet 3
Aug- 16, 1938-
‘
D. L. DRISCOLL
,
2,127,108
WELL DRILLING APPARATUS
Filed March 4, 1936
4 Sheets-Sheet 4
2,127,108.
Patented Aug. 16, 1938
UNITED STATES PATENT OFFICE
2,127,108
WELL DRILLING APPARATUS
Dennis L. Driscoll, Los Angeles, Calif., assignor
to Lawrence F. Baash, Los Angeles, Calif.
Application March 4, 1936, Serial No. 67,080’
18 Claims. (01. 24-263)
This invention relates to well drilling apparatus
and relates more particularly to a rotary table
0
bushing and slips therefor. A general object of
this invention is to provide an improved rotary
table bushing and slip assembly that is particu
larly effective and long wearing.
Another object of this invention is to provide a
practical rotary table bushing and slip assembly
in which the slips all have extensive and equal
seating engagement with the bushing and have
uniform gripping contact with the pipe or object
handled. The extensive engagement of the slips
in the bushing allows the slips to be of light con
struction and of substantial length.
Another object of the invention is to provide
15
a master bushing for a rotary table that has in
clined grooves or slots in its interior of uniform
width throughout their lengths and slips shaped
and proportioned to ?t the slots whereby they
may have extensive continuous engagement with
the walls of the slots while gripping the pipe and
when in any vertical position they may assume
while contacting the pipe. Heretofore it has been
the usual practice to provide a round tapered
opening or a, round opening of downwardly di
minishing diameter in the bushing of a rotary
table to receive the pipe gripping slips. When a
bushing is provided with such a tapered opening
there is only one vertical position in which the
30 slips have full cooperation with the walls of the
bushing and when the slips assume different
vertical positions as they often do when gripping
a pipe, certain of the slips have only line contact
or partial contact with the bushing. In the as
.35 sembly of my invention the slips have full surface
contact with the walls of the bushing slots re
gardless of the vertical positions they may assume
40
when contacting the pipe.
Another object of this invention is to provide a
slip receiving bushing for a rotary table having
an opening of uniform dimensions throughout its
length to more readily pass drill pipe protectors
and other drilling equipment.
Another object of this invention is to provide
an improved assembly of a rotary table bushing
and pipe gripping slips in which the slips cannot
foul one another and cannot turn or tilt laterally
in the bushing.
Another object of this invention is to provide
50 a rotary table bushing and slip assembly in which
all of the several slips have uniform gripping en
a rotary table bushing and slip assembly that em
bodies practical effective rests or cradles for the
slips when they are removed from the bushing
which cradles support the slip in positions for
immediate insertion in the slots of the bushing.
Another object of this invention is to provide
slips having simple and very inexpensive replace
able pipe engaging parts or liners whereby they
may be readily reconditioned or adapted for the
handling of pipe of various diameters.
The various other objects and features of my
invention will be fully understood from the fol
lowing detailed description of typical preferred
forms and applications of my invention, through
out which description reference is made to the 15
accompanying drawings, in which:
Fig. 1 is a top or plan elevation of one form of
assembly provided by this invention. Fig. 2 is an
enlarged fragmentary horizontal detailed sec
tional view taken substantially as indicated by
line 2—2 on Fig. 3. Fig. 3 is an enlarged frag
mentary vertical detailed sectional view taken
as indicated by line 3-3 on Fig. 1.
Fig. 4 is a
fragmentary elevation view of the upper portion
of one of the cradles being a view taken substan
tially as indicated by line 4—4 on Fig. 3. Fig. 5
is an enlarged fragmentary horizontal detailed
sectional View taken as indicated by line 5—5 on
Fig. 3. Fig. 6 is a top- or plan elevation of another
form of assembly provided by this invention. Fig.
7 is a fragmentary vertical detailed sectional view
taken as indicated by line ‘I—'I on Fig. 6. Fig. 8
is a fragmentary horizontal detailed sectional
view taken as indicated by line 8-8 on Fig. 7.
Fig. 9 is a perspective view of the inner side of
one of the bushing sections of the form of the
invention illustrated in Figs. 6, 7 and 8; and Fig.
10 is a top or plan elevation of still another form
of assembly provided by the invention.
The form of the invention illustrated in Figs.
1 to 5, inclusive, of the drawings, includes gener
ally, a bushing I0 for arrangement in a rotary
table T and having slots II in its interior, slips
I2 adapted to fit in the slots II to grip a pipe P
or the like, and rests or cradles I3 for carrying
the slips l2 when they are removed from the
bushing Ill.
The bushing 10 is what is usually termed a
master bushing and is intended for arrangement
in the opening M of the rotary table T. In'the 50
particular form of the invention being described
the bushing I0 is round or cylindrical to‘?t the
gagement with the object or pipe throughout their
lengths to dependably grip the pipe without tend . correspondingly shaped opening M of the table
T. An annular outwardly projecting ?ange I5
ing to distort it.
is provided at the upper end'of the bushing H) to 55
.55
Another object of this invention
to provide
2
.
2,127,108
?t in an enlargement or annular groove IS in
the upper end of the table opening I4 and to
seat on a shoulder |6a in the opening I4. Lugs
l7 project radially from the periphery of the
flange It‘: to ?t bayonet slots I8. in the table T.
Lock blocks l9 are inserted in the bayonet slots
|8 to lock the lateral arms of the lugs II in
the lateral portions of the slots I8. A rotary
table of the general type just described having
full or extensive contact of the slips l2 with the
slot walls. The slots || may extend from the
face or upper end of the bushing H] to the lower
end of the bushing.
The slips l2 are provided to grip and suspend
pipe P, tubing or other well drilling equipment
extending through the bushing opening 2|. The
slips |2 are shaped and proportioned to properly
?t and operate in the above-described slots ||.
The pipe gripping slips |2 are elongate members 10
having ?at parallel opposite sides 23 for cooper~
ating with the side walls of the slots H and hav
ing cylindrically convexed rear surfaces 24 for
bayonet slots for receiving lugs on a bushing is
fully described and claimed in'my co-pending
application entitled Rotary well drilling appa
ratus, ?led November 11, 1935, Serial No. 49,175.
t is to be understood that the bushing ||l being‘ ' shiftably bearing on the inner walls 22 of the
15 described may be shaped to ?t any type of rotary
table opening without departing from . the in
vention. It is to be noted that when the bushing
I0 is designed for use in the particular rotary‘
table T illustrated that it has a cylindrical pe
riphery throughout its length and, therefore, has
a substantial and uniform wallthickness. The
Wall of the bushing I0 may be chambered and
provided with suitable internal reinforcing webs
20.
'
"
.
'
The bushing I0 is preferably sectional to fa
cilitate its insertion in the rotary table T. In
the preferred construction the bushing |0 com
prises two sections A and B of substantially equal
extent as illustrated in Fig. 1 of the drawings.
30 A central vertical opening 2| is provided in the
bushing ID to receive and’ pass the pipe P, tubing
and other drilling equipment. It is afeature of
the invention that the opening 2| is of uniform
diameter or dimensions throughout its length,
35 that is, the opening 2| has vertical walls and is
not tapered or of downwardly diminishing ca
pacity. This formation of the opening 2| ‘per
mits the ready passage of drill pipe protectors
25
and other devices throughthe bushing l8 which
40 often interfere with the lower ends of the usual
master bushings having’ central openings of
downwardly diminishing diameter. 'In the par
ticular form of the invention being described
the opening 2| is round in cross section or is
45 cylindrical, it being understood that the opening
2| of the bushing l0 may be polygonal, as illus
trated in Figs. 6, 8, 9 and 10 of the drawings.
It is a feature of the invention that- longi
tudinal or vertical slots || areprovided inthe
50 wall of the opening. 2| to receive thegslips l2.
The slots | I are circumferentially-spaced to pro
vide for the spaced engagement of the slips |2
with the pipe P. In the drawings I have shown
four equally spaced slots ||,’it being understood
55 that the bushing ||l may be provided with two
slots, three slots or any desired number of slots
II, as desired. In accordance with the invention
the slip receiving slots H are of uniform con
?guration and width throughout their lengths
60 and are of substantial length to present'extensive
walls or surfaces for engagement, by the slips l2.
The opposite side walls of the slots | I are paral
lel and‘are preferably vertical to‘ provide for the
easy insertion of the slips |2. In the particular
inwardly
through
the walls
the slots
H are polygonal or provided with flat inner 20
walls the rear surfaces 24 of the slips |2 may be
flat to have proper cooperation therewith. When
seated in the slots | | the slips l2 project into the
bushing opening 2| to have suspending and grip
ping engagement with the object or pipe P.
25
The active faces or sides of the slips |2 may
be suitably roughened or toothed to properly
grip the object or pipe P. The invention, how
ever, provides. simple and particularly effective
replaceable plates or liners 25 for the active
sides of the slips I2. The liners 25 are secured
to the inner or active faces of the slips l2 and
are adapted to have direct engagement with the
object or pipe P and thus assume the wear. The
faces of the‘ slips | 2 are provided with longitu 35
dinal or vertical grooves 26 for receiving tongues
or keys 2'! on the liners 25. The lowerywalls
28 of the grooves 26 are inclined downwardly
and outwardly. The lower ends 29 of the keys
2‘! are correspondingly inclined to have locking
cooperation with the walls 28. The invention in
cludes simple positive ‘means for removably se- '
curing the liners 25 to the slips l2. Pins or rods
30 are inserted in transverse openings in the
slips I2 and the keys 2'! of the liners 25. The 45
ends of the rods 30 may be riveted over
whereby the rods are dependably held against
displacement to form positive connections be
tween the slips and the liners 25. The ac
tive faces of the liners 25 are cylindrically con 50
caved to conform to the object or pipe P and
are provided with wickers or teeth 3|. The
teeth 3| are adapted to have gripping and sup
porting contact with the pipe P and preferably
face upwardly and inwardly. If desired the 55
teeth 3| may be grooved vertically to more effec
tively resist relative rotation between the pipe P
and the slip liners 25. The liners 25 may be
replaced with liners of different thicknesses to
adapt the slips It! to handle pipe of different 60
diameters.
The bodies of the slips I2 are preferably hol
low or provided with chambers 32 to be light in
weight. Reinforcing webs 33 may extend through
form 'of the invention illustrated'in Figs..1 to 5,
‘inclusive, of the'drawings the inner walls.22 of
‘the chambered interiors of the slips. Guide ?n~ 65
the slots | l are cylindrically concaved. " These
slips B2. The ?ngers 34 project from the lower
ends of the slips l2 at their outer and side sur
faces and slope or curve downwardly and. in
wardly. The mouths or upper ends of the bush 70
ing slots’ Il may have downwardly and inwardly
inclined guide walls or surfaces 35 to assist in
entering and guiding the slips If! in the slots ||.
When entering the slips 12 in the slots | | the ?n
gers 34 may cooperate with the surfaces 35 to 75
inner walls 22 of the slots II are inclined down
wardly and inwardly to slidably receive the slips
| 2 and to provide for the wedging of the slips
against the object or pipe P. The curvature of
the inner walls 22 of the slots is the same
throughout their lengths having a uniform ra
‘is
'
slots. The curved or conveXed surfaces 25 of the 15
slips l2 are inclined downwardly and
but have the same radius of curvature
out their lengths to‘uniformly engage
22. It is to be understood that when
dius of curvature. The above described shape
and proportions of the slots || provide for the
gers 34 may be provided on the lower ends of the
3
2,127,108
guide the slips.
The slips l2 usually project
it is desired to engage or suspend a pipe P pass
above the upper surface of the bushing II) when
engaging the pipe or object P. The invention
provides means for preventing the slips l2 from
falling through or from the slots H. Stop lugs
36 project from the upper portions of the slip
sides 23 and are adapted to ?t in recesses 36a in
the upper face of the bushing ID to limit the
downward and inward movement of the slips l2.
The recesses 368L are suitably shaped and propor
tioned to provide for the necessary play or move
ment of the slips I2.
The invention provides handles H on the slips
I2 to facilitate their insertion in and removal
from the slots ||. The handles H have forks or
15
yokes 31 on their lower ends extending into re
ing through the bushing opening 2| the slips l2
are introduced into the slots H and allowed to
?t downwardly therein until their liners 25 grip
the pipe P. The operator or operators may read
ily disengage the handles H from the forks 45
to allow the slips l2 to slide downwardly in the
saddles 46. The ?ngers 34 on the lower ends of
the slips readily guide the slips into the slots ||.
The slips are free to move downwardly in the 1O
slots || until the toothed inner sides of the liners
25 grip or contact the pipe P. The convex outer
rear sides 24 of the slips |2 have full, even bear
ing engagement with the walls 22 of the slots
cesses 31a in the upper ends of the slips |2. Pivot
pins 38 pivotally connect the forks 31 with the
bodies of the slips |2. Cams or stopv projections
9 may be provided on the forks 31 to limit the in
ward swinging of the handles H. The handles
I-I include stems 39 extending upwardly from the
forks 31 and lateral heads 39a carried on the
stems 39. If desired or found necessary the hamdles H of adjacent slips l2 may be connected
25 whereby two of the slips may be handled simul
taneously. The rear walls of the recesses 31‘a may
be engageable by the handles H to» limit the out
20
|| regardless of the vertical positions assumed 15
by the slips l2 when they contact the pipe P.
The engagement of the surfaces 24 with the slot
walls 22 also maintains the active inner sides of
the liners .25 vertical to properly grip the pipe P.
The ?t of the slips l2 in the slots H is such that 20
the pipe is dependably gripped and supported.
ward and downward pivoting of the handles.
The rests or cradles l3 are provided to support
or carry the slips l2 when the slips are with
drawn from the slots | | and are operable to sup
port the slips in positions where they are entirely
clear of the bushing opening 2|. A cradle I3 is
provided on the bushing ID for each slip l2. The
35 cradles l3 are adapted to be removably secured
to the upper end of the bushing ID in radial align
ment with the slots ||. Each cradle l3 includes
a leg 40 having a substantially horizontal foot
4|. Recesses 42 are provided in the upper side
of the bushing Hi to receive the feet 4|. Coun
tersunk or flush plates 43 extend transversely
across the upper ends of the recesses 42 and the
feet 4| are adapted to be inserted under the
plates 43. Clamp screws 44 are threaded through
the plates 43 and are adapted to clamp against
the feet 4| to securely hold the cradles l3 in
place. The legs 40 project vertically from the
feet 4| and have upwardly and outwardly in
clined portions terminating in forks 45. Con
cave supports or saddles 46 are arranged on the
inclined portions of the legs 40’ to receive the
slips l2. The saddles 46 are shaped and propor
tioned to properly receive the convex outer sides
of the slips.
Means are provided for releasably supporting
or holding the slips l2 in the cradles I3. The
forks 45 on the upper ends of the legs 40 have
flaring or V-shaped notches 41 adapted to receive
handles H. When the slips l2 are raised into the
cradles l3 the handles I-I may be swung down
wardly so that their stems 39 are engaged in the
notches 41. The heads 39a of the handles H are
adapted to engage against the forks 45 to hold
the slips |2 in the cradles l3 in positions where
they are entirely free of the bushing opening 2|.
This elevated or inoperative position of the slips
I2 is illustrated in broken lines in Fig. 3. The
handles H may be easily disengaged from the
forks 45 to allow the slips I2 to enter or move
70 downwardly into their respective slots H.
In the use or operation of the assembly illus
trated in Figs. 1 to 6, inclusive, of the drawings,
the bushing I0 is normally arranged in the table
T as illustrated in Fig. 1 of the drawings. When
75
Due to the fact that each of the slips l2 ‘has uni
form and complete engagement with the inner
wall 22 of its respective slot H the several slips
have even or equal engagement with the pipe P
to dependably grip the pipe without distorting
it. The slips |2 engaging in the slots II are
adapted to form a positive drive for the pipe P
in the event it is desired to rotate the pipe. The
?at parallel sides 23 of the slips H are adapted
to engage the side walls of the slots II for the
transmission of turning forces.
When the slips l2 are no longer required they
may be easily pulled upwardly and outwardly to
rest in the saddles 46. The handles H may be
.
swung downwardly to engage the stems 39 in the
notches 41 so that the slips are held in the cra
dles H3. The slips |2 are very easy and conven
ient to manipulate and are light in weight. The
cradles |3 may be easily disengaged from the
bushing Ii]. The various parts of the assembly
are simple and inexpensive of manufacture. The
slots || may be cored in the bushing I0‘ and the
slips l2 do not require special machining. The
liners 25 of the slips l2 may be sections of strips
or long stock of the desired cross section and are
very inexpensive to manufacture.
The form of the invention illustrated in Figs. 6
to 9, inclusive, of the drawings includes, gener
ally, a master bushing 5|! having internal slots
5|, slips 52 for arrangement in the slots 5| to grip
a pipe P or the like and means 53 for preventing
displacement of the slips and for supporting the
slips 52 when they
upper ends of the
The bushing 53
in the opening of
53 may be shaped
are moved to positions at the
slots 5|‘.
55
is intended for arrangement
a rotary table. The bushing
for arrangement in the table
T illustrated in Fig. 1 of the drawings or may
be polygonal or square, asillustrated in Figs. 6
and 9 of the drawings for arrangement in a typi
cal rotary table. It is to be understood that the
bushing 50 is adapted to be supported in a rotary
table to be driven or rotated thereby.
A cen
tral vertical opening 54 is provided in the bush~ 65
ing 50 to pass the pipe P and other drilling equip
ment. In accordance with the form of the inven
tion being described the opening 54 is polygonal
or square in cross section.
The opening 54 may
be round or cylindrical if desired. The opening 70
54 is of uniform width or dimensions. through
out its length, having vertical Walls. This is
important as it permits the easy free passage of
the drilling equipment through the bushing 50.
The bushing 53 is preferably sectional for ready 75
4
2,127,108
assembling in a rotary table.
As shown in the
drawings the bushing 50 preferably includes two
sections M and N. The bushing 55 is preferably
divided or separated in a vertical plane which
intersects two side walls of the opening 54. In
the preferred construction the slots 5| for receiv
ing the slips 52 occur in the corners of the open
ings 54. The slots 5| are preferably alike in
size and shape and there may be one slot 5|
in each corner of the opening 54.
It is to be
understood that the invention contemplates the
provision of two or more slots 5| in the bushing
opening 54. In the form of the invention being
described the slots 5| are polygonal or flat walled.
15 The side walls of the slots 5| are flat and ver
tical and lie in planes tangent to a circle con
centric with the central longitudinal axis of the
opening 54. The parallel relationship and, there
fore, the uniform spacing of the side walls of the
20 slots 5| continues throughout the entire lengths
of the slots. The slots 5| may extend between
the upper and lower ends of the bushing 55. The
innermost walls or inner walls 55 of the slots 5|
are ?at and are inclined downwardly and in
25 wardly. ‘Curved or inclined surfaces 56 join the
upper ends of the slots. 5| to assist in entering
or guiding the slips 52 into the slots.
The slips 52 are adapted to be inserted in
the slots 5| to grip and suspend the pipe P
30 or other object.
The several slips 52 are alike
and there is preferably a slip 52 provided for
each slot 5|. The slips 52 are shaped to prop
erly ?t the slots 5| having flat parallel sides 51
and downwardly and inwardly inclined rear sur
35 faces 58 for shiftably bearing on the inclined
walls 55 of the slots. The slips 52 are prefer
ably proportioned to have proper play or clear
ance in the slots 5|. The active sides of the
slips 52 are preferably vertical and if desired
teeth or gripping parts may be formed directly
on the slips to cooperate with the pipe P. It is
preferred, however, to provide replaceable shoes
or liners 59 on the slips 52 for gripping the pipe
P. The slips 52 are shaped to receive the liners
59 having vertical channels or grooves 6|] which
terminate at their lower ends in downwardly
and outwardly inclined walls 6|. Tongues or
keys 62 are provided on the liners 59 to fit the
grooves 60 to form positive driving connections
between the liners and slips. The lower ends
of the keys 62 are inclined downwardly and out
wardly to have locking cooperation with the
groove walls 6|.
’
Means is provided for removably attaching
55 the liners 59 to the slips 52.
Rivets or rods 63
are passing through transverse openings in the
slips and keys 62 to secure the liners 59 to the
slips. The opposite ends of the rods 63 may
be headed or riveted. The active faces of the
60 liners 59 are cylindrically concaved to conform,
generally, to the pipe P and are provided with
suitable wickers or teeth 64. The teeth 64 pref
erably face upwardly and inwardly and may be
interrupted by vertical grooves to have more effi
cient engagement with the pipe. The liners 59
may be replaced by liners of various thicknesses
to adapt the slips 52 for the proper handling
of pipe and other objects of various diameters.
The bodies of the slips 52 may be chambered
or hollowed to be light in weight. Reinforcing
webs 65 may extend through the hollow inte
riors of the slips.
Handles H1 are provided on
the slips 52 to facilitate the manipulation of
the slips. The handles H1 may be identical with
~75 the handles H described above and reference
is hereby made to the detailed description of the
handles H. Corresponding reference numerals
are employed to designate corresponding parts of
the handles H and H1 and their mountings.
The means 53 is provided to prevent loss or
displacement of the slips- 52 from the slots 5|
and to assist in supporting the slips in retracted
or inoperative positions at the upper‘ ends of
the slots. The means 53 comprises? elongate
grooves or slots 10 in the side walls of the slip 10
receiving slots 5|. There may be a slot 10 in
each side wall of each slot 5|. The slots 1|] are
parallel with the inclined inner walls 55 of the
slots 5| and terminate some distance above the
lower ends of the slots 5|. Lugs or pins 7| pro 15
ject from the sides of the slips 52 to shiftably
operate in the slots 10. The cooperation of the
' pins ‘II with the slots 10 is such that the slips
52 may properly work and shift in the bushing
slots 5| .
The pins 1| are adapted to cooperate 20
with the lower ends of the slots 10 to de?nitely
limit the downward travel of the slips 52 and
thus prevent the loss of the slips from the bush
ing 5|]. The upper ends of the slots 15 are spaced
some distance below the upper end of the bush 25
ing 59. The slots 10 and the pins 7| are related
so that the pins cooperate with the upper ends
of the slots 10 when the slips 52 are brought
to positions where they may be pivoted onto
the surface 56. The cooperation of the pins 1|
with the upper ends of the slots 70 assists in
retaining or supporting the slips 52 in their up
or inoperative positions on the surfaces 55. Fig.
7 of the drawings illustrates in broken lines a
slip 52 in its retracted position where it rests on 35
the surface 55 with the pins ‘H in cooperation
with the upper ends of the slots 15. In prac
tice removable plates 73 may be recessed or coun
tersunk in the upper ends of the bushing 55 to
close the upper ends of the slots 10. The plates 40
13 thus form the upper ends or walls of the slots
15 and may be removably secured to the bushing
by screws or other suitable means. The plates.
13 are removable to permit the entrance of the
pins 1| in the slots 10 when the slips 52 are as 45
sembled in the bushing 50 and are removable to
permit the withdrawal of the pins 1| from the
slots 15 when the slips are to be removed from
the bushing.
It is to be understood that the invention con
50
templates the embodiment of cradles similar to
the cradles 53 described above, in the form of the
invention illustrated in Figs. 6 to 9, inclusive, of
the drawings, in substitution for the means 53
just described, and contemplates the embodiment 55
of the means 53 in the form of the invention illus
trated in Figs. 1 to 5, inclusive, of the drawings
in substitution for the cradles I3.
The use or operation of the assembly illustrated
in Figs. 6 to 9, inclusive, of the drawings is sub
60
stantially the same as the operation of the pre
viously described form of the invention. The
slips 52 maybe easily passed downwardly into
the slots 5| to contact and grip the pipe P. The
handles H1 facilitate the lowering of the slips and 65
the pins 1| cooperating with the slots 10 effec
tively enter the lower ends of the slips in the
slots. As the slips 52 move downwardly in the
slots 5| their rear surfaces 58 contact the inner '
walls 55 of the slots 5| and this engagement 70
urges the slips inwardly against the pipe P. Thus
the slip-s 52 obtain ?rm dependable gripping con
tact with the pipe P. The rear sides 58 of the
slips 52 are adapted to have full or extensive
cooperation with the inner walls 55 of the slots 75
2,127,108
5| regardless of the vertical positions assumed by
the slips when they contact or grip the pipe.
Accordingly, the slips 52 assume equal loadsin
suspending or engaging the pipe. The flat sided
slips 52 ?tting in the ?at sided slots 5| cannot
possibly tilt or turn and are adapted to form posi
tive effective drives in the event it is desired to
rotate the pipe. The liners 59 are operable to
having a polygonal opening forreceiving a piece
of drilling equipment, and having longitudinal
slots in the corners of the opening, said slots
having substantially parallel side walls and down
wardly and inwardly inclined inner walls, and
slips shiftably ?tting the slots to grip the piece of
obtain ?rm dependable gripping engagement with
equipment.
4. In combination, a bushing for a rotary table
having an opening for receiving a piece of drilling
the pipe P without subjecting the bodies of the
slips proper to wear.
When the slips 52 are no
longer required to grip the pipe P they may be
easily and quickly removed from the slots 5|.
The slips 52 may be easily pulled upwardly from
the slots to positions where they are supported
15
on the surfaces 56 with their pins 1| bearing on
the plates 13 which form the upper walls of the
slots 10. The cooperation of the pins ‘H with the
upper ends of the slots 10 operates to retain the
slips in their inactive positions on the surfaces 56.
The bushings 50 and the slips 52 are simple and
equipment, and having spaced slots in the wall of 10
the opening provided with parallel side walls and
cylindrically concaved inner walls, and slips in
the slots for engaging the piece of equipment and
having parallel sides and cylindrically convex
easy to manufacture. ' The slots 5| may be cored
directly in the sections of the bushing 5|! and the
slips 52 do not require extensive machining. The
liners 59 may be easily replaced to recondition the
25
slips 52 or to adapt the slips for the engagement
of pipes of diiierent diameters.
Fig. 10 of the drawings illustrates a form of
the invention embodying a master bushing 80
30
comprising two unequal sections X and Y. The
bushings 80 may be of the same con?guration
as the bushing H] or the bushing 50.
In the
particular case illustrated the bushing 80 is of the
same general con?guration as the bushing 50.
The polygonal opening 8| of the bushing 85 has
35
flat walled slots 82 in its corners for receiving
slips 83. The slips 83 may be identical with the
slips 52. The bushing 8|) is divided into the two
sections X and Y in a vertical plane 85 spaced
from the central longitudinal axis of its opening
8|. The line or plane 85 of division of the bush
ing 80 preferably angularly intersects two adja
cent sides of the polygonal opening 8|. When the
rear sides for cooperating with the walls of the 15
slots.
5. A slip for arrangement in a rotary table
bushing comprising a slip body having substan
tially parallel sides, and a downwardly and in
wardly inclined rear surface, and means pro
20
jecting from the lower end of the slip body for
guiding it in a slot in the bushing.
6. A slip for arrangement in a rotary table
bushing comprising a slip body having substan
tially parallel sides, and a cylindrically curved 25
downwardly and inwardly inclined rear surface
extending between said sides, and means on the
active face of the slip body for engaging an ob
ject extending through the bushing.
7. A master bushing comprising a body having 30
a polygonal opening with substantially vertical
walls, and having substantially vertical slots in
the corners of the opening, said slots having sub
stantially parallel side walls and inclined inner
co
Walls.
8. A master bushing comprising a body having
an opening with a cylindrically curved wall, and
having spaced vertical slots in the wall of the
opening, said slots having substantially parallel
1'a
40
side walls and inclined inner walls.
9. Apparatus of the characterv described com
prising a master bushing having a polygonal
opening with substantially vertical walls and hav
ing substantially vertical slots in the corners of
bushing 85 is divided in this manner one section
X has three slots 82 while the other section Y
has one slot 82. Where the one section X carries
three slips 83 the bushing 8|] cannot spread or
work and a very positive suspension or gripping
the opening, said slots having substantially paral 45
lel side walls and inclined inner walls, and slips
engagement with the pipe P is obtained. The
operation and the mode of handling the slips 83
50
are the same as described above in connection
with the slips 52.
When I use the term “liner” I refer to the shoe
or shoe-like part that actually engages the pipe
or the object handled.
Having described only typical preferred forms
and applications of my invention, I do not wish
to be limited or restricted to the speci?c details
herein set forth, but wish to reserve to myself
any variations or modifications that may appear
60
to those skilled in the art or fall within the scope
of the following claims:
Having described my invention, I claim:
1. A bushing for a rotary table comprising a
body having a polygonal opening of unvarying
width, and having slots in the walls of the open
ing for receiving slips.
2. In combination, a bushing for a rotary table
having a polygonal opening for receiving a piece
of drilling equipment, and having longitudinal
slots in the corners of the opening, said slots
having inclined walls, and slips arranged in the
slots to grip the piece of equipment and having
inclined surfaces cooperating with said walls.
75
3. In combination, a bushing for a rotary table
arranged in the slots to grip an object extending
through the opening, the slips having substan
tially parallel sides and inclined surfaces for co
operating with the inclined walls of the slots.
10. Apparatus of the character described in
cluding a master bushing for a rotary table, the
bushing having an opening for passing drilling
equipment and slots in the wall of the opening,
gripping slips adapted for insertion in the slots, 55
and stationary cradles carrying the slips for
ready entrance to the slots.
11. Apparatus of the character described in
cluding a master bushing for a rotary table, the
bushing having an opening for passing drilling 60
equipment and slots in the wall of the opening,
gripping slips adapted for insertion in the slots,
stationary cradles on the upper side of the bush
ing for supporting the slips in radial alignment
65
with the slot for insertion therein.
12. Apparatus of the character described in
cluding a master bushing for a rotary table, the
bushing having an opening for passing drilling
equipment and slots in the wall of the opening,
gripping slips adapted for insertion in the slots, 70
handles on the slips, cradles for supporting the
slips above the openings, and parts on the cradles
cooperable with the handles to releasably retain
the slips on the cradles.
13. In combination with a rotary table bushing 75
2,127,108
and a slip for use therein, a cradle for supporting
the slip comprising a support to be mounted on
the bushing, and a saddle on the support for car
rying the slip.
14. In combination with a rotary table bush
ing and a slip for use therein, a cradle for, sup
porting the slip comprising a support to be
mounted on the bushing, and a saddle on the
support having a concave surface inclined down
wardly and inwardly toward the opening of the
bushing to receive the slip.
15. In combination with a rotary table bushing,
a slip for use in the bushing, a handle on the
slip, a support on the bushing, a saddle on the
15 support for carrying the slip, and a fork on the
17. In combination, a rotary table bushing hav
ing an opening for passing drilling equipment,
there being a slot in the wall of the opening hav
ing an inclined inner Wall, and a groove in a
side wall of the slot substantially parallel with
said inclined wall, a seat at the upper end of
the slot, a slip shiftable in the slot operable to
engage an object in the opening and shiftable to
a retracted position on the seat,-and a projection
on the slip operable in the groove and cooper 10
able with the upper end of the groove to retain
the slip on the seat.
18. In combination, a rotary table bushing
having an opening for passing drilling equip
support engageable by the handle to retain the ment, there being a slot in the wall of the open
ing having an inclined inner wall, and a groove
slip in the saddle.
16. A rotary table bushing comprising a body in a side wall of the slot substantially parallel
with said inclined wall, a slip shiftable in the
having a vertical opening and circumferentially slot
operable to engage an object extending
spaced slots in the wall of the bushing, the body through the opening, and a projection on the slip
being divided in a vertical plane spaced from the operating in said groove to prevent displacement
central axis of the opening to comprise two sec
of the slip from the slot.
tions, one of said sections having more slots than
the other.
DENNIS L. DRISCOLL.
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