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Патент USA US2138007

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Nov. 29, 1938.
_|_ H_ HOWARD ET AL
2,138,007
REAMER CUTTER MOUNTING
Filed June 15,1957
E71
@533
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Patented
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UNITED STATES:EFATENT-fOFFICE). _
KRAMER CU'I'I'ER. MOUNTING
John E. Howard and Philip C. Efromson, Whit
tier, Calit; said Efromson assignor to Globe
Oil Tools Company, Dos Nietos, Calif., a cor
poration of California
Application June 15, 1937, Serial No. 148,297
10 Claims. (Cl. 255-73)
This invention relates to well drilling tools and view illustrating one of the supporting pins and
relates more particularly to mountings for the
cutters of well reamers. A general object of the
invention is to provide practical, dependable and
5 effective anti-friction mountings for the roller
cutters of well reamers.
Another object of this invention is to provide
a mounting for a roller cutter of a well reamer
in which the end thrusts in both directions on the
10 cutter are transmitted by anti-friction bearing
elements.
Another object of this invention is to provide
a cutter mounting of the character mentioned in
which the radial thrusts on the cutter are taken
4
s.
6) or transmitted by anti-friction rollers and the
end thrusts are transmitted by balls, the rollers
providing the required support throughout substantial portions of the length of the cutter and
the balls transmitting the end thrusts with a
‘30 minimum of friction.
Another object of this invention is to provide
a cutter mounting of the character mentioned in
which a single row or series of balls assumes the
end thrusts in both directions, thus greatly sim25 plifying the construction and leaving ample space
the adjacent parts. Fig. 4 is a view similar to
Fig. 2 illustrating a modified form of the inven~
tion and Fig. 5 is an enlarged fragmentary ele
vation view of a block and a wedge of the struc- 5
ture illustrated in Fig. 4.
The cutter mounting of the present invention
may be employed to rotatably support the cutters
of well tools of various characters. In the fol
lowing detailed description we will describe two 10
typical forms of the invention employed to ro
tatably support the roller cutters of a well
reamer. It is to be understood that the invention
is not to be construed as limited or restricted to
the speci?c forms or applications of the invention 15
about to be described but is to be taken as includ
ing any features or modi?cations that may fall
within the scope of the claims.
'
A well reamer illustrated in the drawings in
cludes a body or shank Ill having a socket II in 20
one end and a threaded pin it on its other end
for facilitating its connection in the well drill
ing string. The shank i0 is provided with an
enlarged intermediate portion l3 of substantially
triangular horizontal cross section.
Vertical or 25
for long rollers which assume the radial thrusts.
Another object of the invention is to provide a
cutter mounting of the character mentioned em-
longitudinally extending pockets ll are provided
in the apices of the triangular portion iii. The
pockets H are provided to receive the reaming
bodying novel and very effective means for sup-
cutters and their upper and lower walls I 5 are
30 porting the cutter bearing on the body or shank preferably flat and substantially horizontal. A
of the tool.
central longitudinal ?uid passage l6 extends
Another object of this invention is to provide , through the shank Ill from one end to the other
a cutter mounting of the character mentioned in to conduct the circulation ?uid.
which the means for mounting the cutter bearing
A reaming cutter I1 is provided in each pocket
on the tool shank is such that the cutter with its ll. The cutters I‘! are generally cylindrical and
bearing may be mounted on the shank and re- are of substantial length. Central longitudinal
moved therefrom as a unit.
openings l8 extend through the cutters l1 and
A further object of this invention is to provide the upper and lower ends IQ of the cutters are
a cutter mounting means of the character men- preferably flat. The cutter openings l8 may be
40 tioned in which the bearing and the cutter may of uniform diameter with the exception of a
be assembled at the place of manufacture and single race in each cutter opening, as will be
shipped and handled as a unit without danger hereinafter described. The lower portions of the
of loss or displacement of any of the parts.
cutters I‘! are tapered and suitable axially ex
The various objects and features of our inven- tending cutting teeth 20 are provided on the
(5 tion will be fully understood from the following cutters to act on the earth formation at the side
detailed description of typical preferred forms wall of the well bore. The means or mountings
60
30
35
40
45
and applications of the invention, throughout
for mounting the several cutters Il may be
which description reference is made to the ac-
identical. We will proceed with a detailed de
companying drawings, in which:
Fig.1 is a side elevation of a reamer embodying
one form of the invention. Fig. 2 is an enlarged
vertical fragmentary detailed sectional view of
the reamer illustrated in Fig. 1 showing one of
scription of the mounting for one of the cutters
I1, it being understood that this description is 50
equally applicable to the mountings of the other
cutters.
The improved cutter mounting of the present
the cutters and its mounting means. Fig. 3 is an
55 enlarged fragmentary vertical detailed sectional
invention comprises, generally, detachably con- ~
nected shaft members or bearing members 2i ex- 55 l
2
2,188,007
tending through the opening I! of the cutter l1,
elongate substantially. cylindrical members and
grooves are adapted to substantially entirely re
ceive the balls 23. It will be apparent how the
balls 23 cooperating with the grooves 28 and 29
effectively transmit the end thrusts in both direc
tions between the cutter I1 and the members 2|
with a minimum of friction. It is important to
note that only a single set of balls 23 is required for
the transmission of the operating end thrusts in
both directions. Further, it will be observed that
the balls 23 cooperating with the grooves 23 and 29 10
prevent longitudinal separation or displacement
of the cutter H from the bearing members 2| when
the assembly of the cutter and its bearing parts
are alike or complementary.
is separate or detached from the reamer.
sets of rollers 22 cooperating with the members
2| and the wall of the cutter opening I! to sup-v
port the cutter against radial thrusts, a set of
balls 23 cooperating with the members 2| and the
cutter l1 to support the cutter against end
thrusts and means 24 cooperating with the mem
bers 2| to support the same where the cutter I1
is rotatable in a pocket M.
10
The shaft members or bearing members 2| are
adapted to be connected to constitute the cutter
supporting pin or shaft. The members 2| are
There are two mem
15 bers 2| of substantially the same diameter and
the members are receivable in the cutter opening
IS with suitable clearance. The adjacent inner
ends of the two members 2| are releasably or de
tachably connected. A socket 25 of reduced
20 diameter is provided in the inner end of one
member 2| and an extension or pin 26 is pro
vided on the inner end of the other member 2|
and is threaded in the socket 215 to connect the two
80
85
40
45
50
55
60
65
70
75
Y
The means 24 for supporting or mounting the 15
bearing members 2| supports the same on the
shank | 0 'where the cutter I1 is in its proper oper
ative position in a pocket H. The means 24 is
characterized by its simplicity and dependability.
In’ the form of the invention illustrated in Figs.
1 to 3, inclusive, of the drawings, the means 24
includes screws 30 threaded in vertical or longi
tudinal openings 3| in the shank portion l3. The
members. The pin 26 threaded in the socket 25 openings 3| extend from the ends of the shank
connects the two members 2| so that their inner . portion |3 to the upper and lower walls I5 of the
ends are in abutment. The members 2| are pref
pocket l4 and the openings are in vertical or
erably of equal length and the aggregate length longitudinal alignment. The screws 30 are
of the members is equal to or slightly greater threaded in the openings 3| to have portions pro
than the length of the cutter l1 so that the outer ject into the pockets | 4 to cooperate‘ with the
ends of the members 2| are at or adjacent the
bearing members 2|. In the particular con
ends IQ of the cutters l1. The outer ends of the struction illustrated in the drawings the screws
bearing members 2| may be ?at.
30 and the openings 3| have self-locking threads
The sets of rollers 22 ‘are arranged between or 32 of the “Dardelet” type whereby the screws are
cooperate with the members 2| and the wall of locked against loss or loosening when su?lcient
the cutter opening I6 to transmit the radial stress is placed on them, as will be hereinafter de
thrusts between the cutter l1 and the members. scribed. It is to be understood that the screws
In the preferred construction there are two longi~ 30 may be locked in place by other suitable means,
tudinally spaced sets of rollers 22, it being under
if desired. Reduced polygonal heads 33 may be
stood that there may be a greater number of sets provided on the outer ends of the screws 30 to
of shorter rollers provided if desired. Each hear
facilitate their turning or threading with a suit
ing member 2| has an annular depression or cir
able wrench. The heads 33 are preferably en
cumferential groove 21 spaced between its ends to tirely within the openings 3|.
receive a set of rollers 22. The grooves 21 are of
The means 24 further includes cooperating
substantial length and the two grooves are pref
tapered plug parts and sockets on the screws 30
erably equally spaced from the central trans~ and members 2| whereby the screws 30 support
verse axis of the cutter H. An annular set or the members 2| and hold the members against
series of rollers 22 is provided in each groove 21. movement and turning. In the construction il
The rollers 22 are of substantial length to have lustrated in the drawings a tapered plug part 35
extensive longitudinal engagement with the wall is provided on the inner end of each screw 30.
of the cutter opening l8 and the inner walls of the The plug parts 35 are integral with the screws 30
grooves 21. The ends of the rollers 22 may co
and are preferably frusto-conical, having ?at
operate with the end walls of the grooves 21 to inner ends. The outer ends of the bearing mem
limit the endwise movement of the rollers. It will bers 2| have central tapered sockets 36 for re
be understood how the longitudinally spaced sets ceiving the plug parts 35. The cooperation of the
of rollers 21 effectively and dependably transmit plug parts 35 with the sockets 36 de?nitely locates
the radial operating thrust between the cutter l1 the bearing members 2| and prevents shifting and
and the bearing members 2 | .
turning of the ‘members whereby the cutter I1 is
The row or set of balls 23 is provided to trans
dependably supported on the shank Ill. Polyg
mit the end thrust between the cutter I1 and the onal sockets 31 may continue inwardly from the
bearing members 2|. It is a feature of the in
inner ends of the sockets 36 to receive wrenches
vention that there may be a single circumferential for threading the members 2| together and for
row or series of balls 23. The row of balls 23 is disconnecting the members. The pitch of the
spaced substantially midway between the opposite surfaces of the plug parts 35 and the walls of the
ends IQ of the cutter. l1. An annular race or sockets 36 is such that the cooperation of the
groove 28 of partially cylindrical cross section parts with the sockets securely holds the members
is provided in- the wall of the cutter opening l8 2| against shifting and against rotation. With
midway between the ends of the cutter l1 to the plug parts 35 in cooperation with the sockets
cooperate with or partially receive the balls 23. 36 the members 2| are supported where their
An annular groove 23 of partially cylindrical cross ends l9 are clear of the end walls l5 of the pocket
section is formed in the assembly of the two
l4 and the ends ll! of the cutter U have suitable
members 2| to directly oppose the groove 28. clearance with the end walls of the pockets.
In practice the groove 23 has substantially equal
In assembling a cutter H on the shank III a
portions in the abutting inner ends or corners set of rollers 22 is ?rst assembled in the groove
of the members 2|. The grooves 26 and 23 may 21 of one of the members 2| and the member
both be of substantial depth so that the two carrying its rollers is then inserted in the cut
80
40
45
55
60
65
70
75
2,188,007
ter opening I6. The balls 23 are then dropped
in the open end of the opening l6 and when a
su?‘icient number of balls has been dropped in,
the member 2| is moved to a position where
" the balls are received in the groove or race 28.
The rollers 22 are then arranged in the groove
21 of the other bearing member 2| and the said
other bearing member 2| with its rollers is in
serted in the cutter opening ill. The two mem
bers 2| are then threaded together. This thread
ing together of the members 2| brings their
inner ends into abutment and completes the
race or groove 29, which cooperates with the balls
23.
The balls 23 cooperating with the grooves
15 28 and 29 serve to prevent relative longitudinal
movement between the cutter l1 and the con
nected members 2| so that the several parts of
the assembly are retained in their proper
positions.
20
.
To mount the assembly on the shank III the
screws 30 are backed out of‘ the pocket I4 and
the cutter I1 is arranged in its approximate po
sition in the pocket.
The screws 30 are then
threaded inwardly to have their plug parts 35
25 cooperate with the sockets 36.
The screws 3|]
may be threaded to positions where the cutter
I1 is mounted in its proper position in the
pocket M. The tightening down of the screws
30 to force their plug parts 35 into tight engage
80 ment with the walls of the sockets 36 depend
ably prevents shifting of the connected mem~.
bers 2| and the rotation of the members 2| so
that the cutter I1 is dependably mounted in the
pocket l4. Tightening down of the screws 30
also causes automatic binding or locking of the
self-locking threads 32.
i
>
In the operation of the reamer the cutter |1
cooperates with the side wall of the well bore and
rotates about its own axis.
The rollers 22 have
40 extensive or long engagement with the wall of
the cutter opening l8 and with the walls of the
grooves 21 to e?ectively transmit the radial
thrusts between the cutter and the members 2|.
The balls 23 cooperating with the grooves 28
45 and 29 transmit the end thrusts in both direc
tions between the cutter l1 and the members
2|. The balls 23 transmit these end thrusts with
a minimum of friction. It will be understood
how the cutter i1 and its bearing elements may
50 be easily removed from the shank ||l for repair
and replacement by backing off the screws 30.
Figs. 4 and 5 of the drawings illustrate a modi
?ed form of the invention in which the bearing
members 2| are supported by blocks. The cutter
55 H, the bearing members 2|, the rollers 22 and
the balls 23 may be the same as in the pre
viously described form of the invention. In the
construction illustrated in Figs. 4 and 5 of the
drawings the portion |3 of the shank has verti
60 cal or longitudinal grooves 40 communicating
with the opposite ends of the pocket H. A shift
able block 4| is arranged in each groove 4|).
The blocks 4| are shiftable vertically or longi
tudinally in the grooves 40 and have vertical slots
65 42. Screws 43 are passed through ‘the slots 42
and are threaded into openings 53 in the shank
i0. Round or cylindrical heads 44 are provided
on the screws 43 and are adapted to clamp
against shoulders 45 at the mouths of the slots
Tapered plug parts 46 are provided on the
blocks 4| to cooperate with the sockets 36 in
the bearing members 2|. The plug parts 46 may
be similar to or identical with the plug parts 35,
described above.
Wedge means are provided for urging the
70 42.
3
blocks 4| toward the outer ends of the members
2| to eifect the proper cooperation of the plug
parts 46 with the sockets 36. A wedge 41 is ar
ranged in the outer part of each groove 46. The
wedges 41 are adapted to engage between the
outer ends of the blocks 4| and the outer walls
of the grooves 40. The outer ends 44 of the
b‘ocks 4| are tapered or inclined and the wedges
41 have correspondingly inclined faces coop
erating with the ends 46. Screws 49 are passed 10
inwardly through openings 50 in the wedges 41
and are threaded into openings 6| in the shank
Ill. The heads of the screws 49 are preferably
received in the outer portions of the openings
50.
15
When the assembly of a cutter l1 and its bear
ing elements is to be mounted in the pocket
M the blocks 4| may be moved to retracted posi
tions so that their plug parts 46 are clear of the
pocket. The assembly of the cutter and its bear
ing elements is arranged in place in the pocket
l4 and the blocks 4| are moved to positions where
their plug parts 46 are received in the sockets
36. The screws 43 are threaded in the openings
53 and left in a loosened condition to allow
shifting of the blocks 4|. The wedges 41 are
then entered in the outer portions of the grooves
46 and the screws 49 are tightened down. Tight
ening down of the screws 49 brings the wedges
41 into wedging cooperation with the inclined
ends 48 of the blocks 4| and the wedges urge
the blocks inwardly toward the ends of the cut
ter l1 so that the plug parts 46 are tightly forced
into the sockets 36. The screws 43 are then
tightened down. The plug parts 46 cooperating
with the sockets 36 dependably hold the bearing
members 2| in position and prevent rotation of
the bearing members.
Having described only typical preferred forms
and. applications of our invention, we do not
wish to be limited or restricted to the speci?c
details herein set forth, but wish to reserve to
ourselves any variations or modi?cations that
may appear to those skilled in the art or fall
within the scope of the following claims.
Having described our invention, we claim:
1. A well reamer comprising an elongate shank,
an elongate roller cutter having a longitudinal
opening, a supporting element extending through
the opening from one end of the cutter to the
other, means engaging the opposite ends of the
element and supporting the element in substan
tially parallel relation to the longitudinal axis of
the shank, a single anti-friction bearing trans
mitting end thrusts in both directions from the
cutter to the element, and bearing means trans
mitting the radial thrusts from the cutter to the
element.
2. A well reamer including a shank, an elongate
roller cutter having a longitudinal opening, a
supporting element extending through the open
ing from one end to the other, means engaging
the opposite ends of the element and removably
supporting the element in a substantially verti
cal position on the shank, a single anti-friction
bearing cooperating with the element and the
interior of the cutter substantially midway be
tween the ends of the cutter and transmitting
end thrusts in both directions from the cutter to
the element, and bearing means transmitting
70
the radial thrusts from the cutter to the element.
3. A well reamer including a shank, an elon
gate roller cutter having a longitudinal opening,
a supporting element extending through the
opening from one end to the other, means en 76
,4
8, 188,007
gaging the opposite ends of the element and re
movably supporting the element in a substan
tially vertical position on the shank, a single
row of balls transmitting end thrusts in both
directions from the cutter to the element, and
bearing means transmitting the radial thrusts
from the cutter to the element.
4. A well reamer comprising a shank, an elon
gate roller cutter having an opening, a support
10 ing element extending through the opening
from one end of the cutter to the other, means
removably supporting the ends of the element
on the shank, the wall of the opening and the
element having a pair of opposing ball races,
16 balls in the races transmitting end thrusts in
both directions between the cutter and the ele
ment, and sets of rollers at opposite sides of the
races cooperating with the wall of the opening
and the element and transmitting radial thrusts
20 between the cutter and element.
5. A well reamer comprising a' shank, a roller
cutter having an opening, a supporting element
extending through the opening from one end to
the other, means removably supporting the op
posite ends of the element on the shank'so that
the element is substantially parallel with the
longitudinal axis of the shank, the‘ wall of the
opening and the element having a pair of op
posing ball races substantially midway between
30 the ends of the cutter, balls in the recess trans
mitting end thrusts in both directions between
the cutter and the element, and sets of rollers at
opposite sides of the races cooperating with the
wall of the opening and the element‘ and trans
mitting radial thrusts between the cutter and‘
element.
6. A well teamer comprising, a shank, a roller
cutter having‘ a longitudinal opening, two thread
edly connected members in the opening, a single
40 row of balls cooperating with the interior of the
cutter and the connected members transmitting
end thrusts in both directions between the cut
ter and the members, rollers cooperating with
the interior of the cutter and the members trans
mitting the radial thrusts between the cutter
and the members, and means mounting the ends
of the assembly of the members on the shank.
7. A well reamer comprising, a shank, a roller
cutter having a longitudinal opening, there be
ing a ball race in the wall of the opening 'be
tween the ends of the cutter, two shaft members,
one entering each end of the ‘opening, means
threadedly connecting the inner ends 01' the
members, there being grooves in the inner por
tions of the members Joining to form a ball
race which opposes the ?rst mentioned race, a
series of balls in the races transmitting end
thrusts in both directions between the cutter
and the members, and means supporting the
outer ends of the members on the shank.
8. A well reamer comprising, a shank, a roller
' cutter having a longitudinal opening, there be
ing a ball" race in the wall of the opening be
tween the ends of the cutter, two shaft mem 10
bers, one entering each end of the opening,
means threadedly connecting the inner ends of
the members, there being grooves in the inner
portions of the members joining to form a ball
race which opposes the ?rst mentioned race, a 15
series of balls in the races‘ transmitting end
thrusts in both directions between the cutter
and the members, each member having a groove,
rollers in grooves ‘cooperating with the wall of
the opening and transmitting the radial thrusts 20
between the cutters and the members, and means
supporting the outer ends of the members on the
shank.
9. A well reamer comprising a shank having a
pocket, a roller cutter having a longitudinal 25
opening, and means for rotatably supporting
the cutter in the pocket including two elements,
one a cutter support extending through the
opening, the other a member shittably secured
to the shank, there being a tapered socket in 30
one element, a plug part on the other element
cooperating with the socket, and means for shift
ing the said member on the shank to e?ect en
gagement and disengagement of the plug part
and socket, the last mentioned means including
a wedge cooperable with the said member, and a
screw for setting the member in adjusted po
sition.
10. A well reamer comprising a shank having
a pocket, a roller cutter having a longitudinal
opening, and means for rotatably supporting the
cutter in the pocket including two elements, one
a cutter support extending through the opening,
the other a member shiitably secured to the
shank, there being a tapered socket in one ele
ment, a plug part on the other element cooperat
ing with the socket, and means for shifting the
said member on the shank to e?ect engagement
and disengagement oi.’ the plug part and socket,
the last mentioned means including a wedge co~
operable with said member.
JOHN H. HOWARD.
PmLIP C. EFROMSON.
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