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May 3'1, ‘1949'
J. s. eoopwm
2,471,616 '
Filed April 10, 1945'
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Arm/MEY- '
Patented May 31, 1949
John S. Goodwin, Whittier, (Jaliicl, assignor to
Globe Oil Tools Company, Los Nietos, Calif., a
corporation of California
Application April 10, 1945, Serial No. 587,453
6 Claims. (Cl. 255—72)
This invention relates to core catchers and re
lates more particularly to core catching and
mounting means for embodiment in a well tool.
An object of my invention is to provide a simple,
practical and effective core catcher for a well drill
or a well core drill which is positive and depend
able in operation.
Another object of my invention is to provide
Fig. 3 is an enlarged fragmentary cross sec
tional view taken as indicated by the line 3-—3 of
Fig. 1.
Figs. 4 and 5 are fragmentary vertical sectional
views taken as indicated by the lines 6-4 and
5-5 of Fig. 3, respectively.
The core catcher of my invention is adapted
to be embodied in or applied to core drill or cor
ing devices of various types. In the following de
tailed speci?cation I will disclose a typical pre
ferred form of the invention embodied in a typical
whereby the capacity of the tool is as great as
core drill, it being understood that the inven
tion is not intended to be limited or restricted
Another object of my invention is to provide
to the speci?c form or application described, but
a well drilling tool incorporating a core catcher
to be considered as including such features or
of extremely large capacity as related to the size
modi?cations which may fall within the scope
of the drilling bit of said tool whereby said tool
a well tool in which a core catcher, embodied in a
core drill, has a maximum feasible core opening
is enabled to function as a fishing tool or junk
catcher of extremely large capacity.
Another object of my invention is to provide
of the invention as claimed.
The drawing illustrates a single barrel core
drill involving the invention and which may
a well drilling tool incorporating a core catcher 20 be said to comprise, generally, a barrel II], a bit
head H carried by the barrel l0 and respective
and adapted for use as a ?shing tool for catching
uppergand lower core catcher units 12 and I?»
both small and relatively large items or junk
carried by the bit head II, and each having re
lost in the well.
tractable ?ngers or dogs.
Another object of my invention is to provide
The barrel I0 is adapted to be attached to the
a tool of the character indicated which has a 25
end of an operating string of drill pipe or
core catcher of such relatively large size as to
the like, and to receive the core cut by the bit
enable the tool to take a core which could only be
head H. The barrel 150 is a generally tubular
taken previously by an oversize head spring type
member which may be of any desired length. In
catcher, and yet enable the tool to fish and hold
small items previously handled by a regular 30 accordance with the usual practice, the barrel
It may be provided at its upper end with a
head with dog type catchers.
threaded box M for receiving a mating pin on the
A further object of my invention, therefore,
lower end of a string of ‘drill pipe. Said upper
is to obviate the need for different types and sizes
end l5 of the barrel I0 is shown as smaller in
of tools for coring or for ?shing and to provide
diameter than the remaining elongated portion
one tool capable of performing the work of said 35
l6 of the barrel. A central longitudinal opening
different types and sizes of tools with resultant
I‘! is provided in said portion [6 for receiving the
economy and saving of time.
core cut by the drill, said opening I‘! having con
A further object of my invention is to provide
nection with the box l4 by means of a smaller
a core catcher in which the structural details
aligned opening I8. The lower end of the barrel
and their arrangement are of novel design and
form enabling the provision of an extremely large
core catcher in a core bit of regular size and in
which the parts are sturdy, strong and wear
resistant to a high degree.
The various objects and features of my in
vention will be fully understood from the follow
ing detailed description of a typical preferred
form and application of the invention, through
out which description reference is made to the
accompanying drawings, in which:
Fig. 1 is a longitudinal broken elevational view
in quarter section of a core drill embodying my
Fig. 2 is a cross sectional view taken as indi
cated by the line 2-2 of Fig. 1.
portion is somewhat reduced in diameter to pro—
vide an annular shoulder I9 and said reduced
end is externally threaded as at 2B.
The bit head I I is operable to make an annular
45 cut in the earth formation to form a core to be
received by the barrel l0. Said bit head i l com
prises a tubular member 21 having internal
threads 22 for connection with the threaded end
25 of the barrel ill and engaged with the shoulder
i9 thereof to form a rigid extension of said barrel.
The lower end of the bit head H is provided with
an inreaching annular ?ange 23 de?ning a central
cylindrical opening 24 which, in the present case,
approximates the opening I? in size and is longi
tudinally aligned therewith. The bit head II,
between the ?ange 23 and the bottom end of the
barrel it, has an opening 25, larger in diameter
35 is slit through from top to bottom as at 38.
than either opening I‘! or 24, providing a con
necting chamber for said openings l1 and 24
Within the ring 35, and resting upon the shoulder
?ange 36, there is provided an inner ring 39 of
lesser height than the ring 35 and having an
in which the core catcher units I2 and I3 are
annular recess 49 at its lower end into which said
located. The bit head II is provided with earth
shouider ?ange engages. The central opening or
formation cutting parts 26. Generally, and in a
bore iii of the inner ring 39 approximates the
conventional manner, the cutting parts 26 com
passage 26 in size so that said opening forms a
prise integrally connected cutting blades on the
continuation of said passage. The inner ring 39
tubular member H which project outwardly and 10 is formed with a plurality of slotted openings or
downwardly from the lower end of said tubular
notches £52 in register with the slotted openings
member. The cutting blades 26 are spaced apart
or notches 3? in the outer ring. The openings
62, however, extend downwardly from the top
edge of the. ring .35! and are, in part, co-extensive
with the openings 37 to provide seats t3 for the
dogs 32 and 33. Said seats 43 are each defined by
the aligned or registered lateral walls of the
registered notch-like openings 3'! and 42, by an
Generally, the above-described core drill com
upper slightly angled wall 44 of the opening 31,
prising the barrel Ill and the bit head II, is of
conventional form. However, the proportion and 20 and by a lower also angled wall 45 of the opening
arrangement of the parts have been designed.
62. The ring 39 is further provided ‘with a periph
disposed?to ,, make
annular out in the earth formation and to form.
a core which is adapted to pass into the chamber
25 and into the opening I1 with suitable
with the view of providing a core drill particularly
suitable for the present invention. It will be
noted that the barrel .IU comprises a, single ele
ment of strong and easily manufactured design.
whereas, heretofore, the barrel was made. of
several parts such as barrel, tubes, subs, adapters,
etc. Byineans of the constructionwhich I have
provided, the openings I ‘I and 24 and the chamber
25 can beand are extremelylarge, diametrally,
with relation to the size. of the. .tool .as awhole.
By means of my construction, the tubular mern»
ber- 2i can have’. a. relatively thin’. yet strong
tubular outer wall. whereby themaximum prac~
tical diameter of the~chamber25 is aiforded. ‘Ac
cordingly, I am enabled to make thecore receiv
ing openings 24 and. I.1,_.commensurately large.
When the above-described tool is lowered into- a
well bore, the cutters» 26 penetrate‘the‘ formae
tion‘leaving-a core which is receivedin the aligned
openings 24 and I1 .and- chamber 25;
The tool ‘which I-have provided; in addition-to
functioning as a core catcher, can be advantage
ously used as a; ?nishing tool vor junk catcher. Ac
eral groove or channel 5:6 which extends between
the dog seats £13. The rings 35 and 39 are secured
together by rivets or the like, 4'! which I show
arranged in two sets connecting the unslotted
portions of the rings.
The dogs 32 and 33 are mounted in the seats
£33 to extend radially inward. Each dog com
prises an elongated member which is generally
wedge-shaped from its relatively thin end 43 to
its thicker portion Liii adjacent a hole Ell in said
dog for a pivot pin 5I engaged in the channel 46.
Around the hole 5%, the dog is formed with a
radius 52 extending tangentially from the under
surface 53 of the dog toa lug 54 directed at an
angle to the elongated portion of said dog. In
the unretracted position of the dog, the portion
of its surface 53 adjacent to the radius 52 engages
the angled wall 135 and the lug 53 engages the
opposed angled Wall M to provide two points of
support for the dog ‘on opposite sides of its pivot
pin 5i. Each pivot pin 5| extends laterally of
the dog which it mounts and into the channel
46. Accordingly, said extending ends of each pin
cordingly, I provide the upper core; catcher unit 45 are beveled as at 55 to conform with the circum
ferential curvature of the ring 35.1 By means of
I2 for the primary purpose of breaking out the
this structure the pins M are also prevented from
core which is formed by the tool and the lower
being-dislodged laterally.
core catcher unit I3 forthe-prirnary purpose of
engaging items which may'beilost in, thewell and 50 It is apparent from the foregoing that as the
tool forms a core, said core will progressively
which may vary greatly in size, Generally, I pro
project into the chamber 25 and will retract the
vide each unit I2 and I3 .withqa plurality of in
dogs 32 and 33 upwardly around their pivot pins
reaching radially ‘disposed retractable‘ ?ngers or
5!. From Fig. 4 it will be seen that I have de
dogs, the dogs-30 and >3I‘. of the upper unit ['2'
signed the core catcher so that the dogs can be
being generally. shorter thanthe ‘dogs 32 and 33
fully moved out of the path of the core to be en
of the lower unit I3. The dogs of the‘ upper ‘unit
tirely clear of said core. I have, therefore, ar
52, when unretracted', extend toward the center
ranged the upper surface 56 of each dog to inter
of the chamber 25=~but --'fall short thereof to‘ leave
cept a radius 5'! equal to the radius 52 around the
a relatively large central open‘ing‘3'4 between their
dog hole 5!) so that said dog surface 55 is enabled
inner ends. Both sets of dogs areupwardly re
60 to lie ?at against the inner surface‘of the ring
tracted by the core as it enters ‘the chamber 25.
35. In this fully retracted position the dogs are
The units I2 and I3 areiessen'tially the same with
clear of the core.
the exception of the lengths of their respective
The dogs 32 and 33 are retractable against
dogs and with the further exception that the unit
I3 is higher or wider than the unit I2. Accord
ingly, the following description of the unit I3
will serve to describe the unit I2‘ also.
The unit I3 comprises an outer ring 35 having
a cylindrical inner wall 4Ia- and having an in
_ spring or similar means which seek to swing the
dogs down to their inreaching position as deter
mined by the angled walls 44 and 45. For this
purpose, each dog is provided with a slot 58 be
tween andparallel to the sides of the dog to bifur
cate its pivot end. Within the slot 58 and around
reaching annular shoulder ?ange 36 at its lower 70 the pivot pin 5 I, I provide a coiled‘ or twist spring
end and a plurality-of uniformly spaced slotted
59 having one end 60 bearing on the ring 35 and
openings 3'! extending upwardly from saidlower
the other end 6| bearing on the dog.
end. In this case the unit [3 carries ?ve each of
From the above structure it will be seen that
the dogs 32 and 33 and, therefore, has ten open
side thrusts on the dogs are taken by the side
ings 31. Between two of the openings, the ring 75 walls of the openings 42 of the inner ring 39 and
that longitudinal loading forces, which act down
wardly only, are taken by the assembled rings 35
and 39 at their angled walls (ill and 45, the pins
5! serving merely to hold the dogs in position.
It will be further seen that because of the engage
ment of the ?ange 36 and the shoulder lit], the
rings 35 and 39 cannot separate axially in one
direction, and because of the engagement of the
dog lug 513 with the angled Wall 44, said rings can
not separate axially in the other direction.
The tool above-described, after forming a core
which projects upward into the barrel passage
H, can be operated to break out said core. This
core breaking operation is performed by raising
the tool so that the bit head i i is lifted from the
formation at the bottom of the well bore. Since
the springs 53 urge the retracted dogs inwardly,
said dogs are forced progressively further into the
ring and engaged with said shoulder ?ange,
means connecting said rings, there being aligned
notches formed in both rings establishing a plu
rality of circumferentially spaced seats, a plu
5 rality of like dogs, means pivotally mounting a
dog in each seat, and resilient means engaging
each dog and normally yieldingly holding the dog
in a position Where it extends substantially
radially of the rings and inwardly from its point
of pivotal mounting.
3. In a core breaking and catching means, a
vertical external ring having an internal cylin
drical wall and a lower inwardly directed annular
shoulder ?ange, an internal ring of lesser height
and greater thickness than the external ring and
located within the cylindrical wall of the exter
nal ring and engaged with said shoulder ?ange,
the said external and internal rings having
registering dog receiving notches, there being a
readily broken loose from the formation by pull~ 20 pin carrying channel in the exterior of the in
ternal ring, and means joining the rings together
ing upwardly on the tool. It is evident that the
with said wall of the external ring closing said
shortest dogs 30 will more efficiently bite into the
core because the change in the angular position
core as the tool is rotated and the core can be
4. A core breaking and catching unit includ
core. The other longer dogs 3!, 32 and 33, While 25 ing, a vertical outer thin walled split elongate
cylindrical ring having an inwardly directed an
less efficient as core cutters because of their
nular shoulder ?ange at its lower end portion and
greater length, function more efficiently as catch
a plurality of downwardly opening notches in its
ers for items lost in the well bore. I have, there
lower end portion, an inner ring arranged within
fore, provided each dog with side bevels 62 for the
the ?rst mentioned ring and seated on said
purpose of providing cutting edges adapted to cut
shoulder ?ange and having a wall thicker than
in the core and, in the case of the longest dogs
that of the outer ring with a plurality of upwardly
33, for the further purpose of obtaining the maxi
opening notches aligned with the ?rst mentioned
mum length of said dogs 33 as best seen in Fig. 2.
notches and in communication with the ?rst
Each of the units l2 and it are easily assem
mentioned notches to form a plurality of seats,
bled. The dogs are first mounted on the ring 33,
the upper end of the inner ring terminating be
the split outer ring 35 is then sprung over the
low the upper end of the outer ring, a plurality
dogs, pulled into place, and riveted together as
of tapered dogs, pivot pins held between the rings
described. The catcher units thus provided afford
and pivotally mounting a dog in each seat, re
maximum support for the dogs with minimum
thickness of the rings 35 and 39 resulting in the - silient means engaging each dog and normally
yieldingly holding it in a position where it ex
ability of the tool to handle an extremely large
tends radially of the rings and inward toward
core. Also, the flange 23 of the bit head fully
the center of the unit, each dog being adapted to
supports the catcher unit is, and the latter in
be retracted to assume a position with its upper
turn, fully supports the unit 12 when the tool is
side substantially parallel with the ?rst men
pulled upwardly to break the core. Further, the
tioned ring while its lower side extends upwardly
?ange 35 of each unit takes the upward thrust
and outwardly, and means joining the rings to
of the tool as imparted to the ring 35 of each unit,
is more rapid as said dogs are forced into the
to remove ‘the shear on the rivets All’.
Having described only a typical preferred form
and application 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
variations or modi?cations that may appear
to those skilled in the art and fall within the scope
gether holding the dogs and pins.
5. A core breaking and catching unit includ
ing, an outer thin walled split elongate cylindri
cal ring having an inwardly directed annular
shoulder ?ange at its lower end and a plurality
of downwardly opening notches in its lower end,
an inner ring seated on said shoulder ?ange and
55 having a Wall substantially thicker than that of
of the following claims.
the outer ring and having a plurality of upwardly
Having described my invention, I claim:
opening notches in its wall aligned with the
1. Core breaking and catching means inclucl~
of the outer ring to form a plurality of
ing, a vertical external elongate ring having an
seats, said inner ring being formed with an
inwardly directed annular shoulder ?ange at its
lower end, a vertical internal ring of lesser height 60 annular outwardly faced circumferential groove
interconnecting said seats and closed by the inner
than the external ring arranged within the ex
of the wall of the outer ring, pivot pins in
ternal ring and engaged with said shoulder ?ange,
said groove retained therein by the inner ring
means connecting said rings, a plurality of seats
and each extending across a seat, and a dog
comprising aligned notches formed in both rings,
a plurality of like dogs, means pivotally mounting 65 pivotally carried on each pivot pin and normally
radially directed toward the center of the unit.
a dog in each seat, and resilient means engaging
6. A core breaking and catching unit includ
each dog and normally yieldingly holding it in
ing an outer thin walled split elongate cylindri
position where it extends substantially radially
cal ring having an inwardly projecting annular
of the ofrings
and mounting.
is inwardly directed from
shoulder ?ange at its lower end and a plurality
of downwardly opening notches in its lower end,
2. Core breaking and catching means includ
an inner ring engaged in the outer ring and on
ing, a vertical external split ring having an in
said shoulder ?ange and having a plurality of
wardly directed annular shoulder ?ange at its
upwardly opening notches aligned with the
lower end, an internal ring of lesser height than
the external ring arranged within the external 75 notches of the outer ring to form a plurality of
seats, said inner ring being substantially thicker
than the'outer ring and terminating a substantial
The following references are of record in the
distance below the upper end of the outer ring and
file of this patent:
being formed in its outer wall with an'annular
outwardly faced circumferential groove inter 5
connecting said seats, pivot pins in said groove
and each extending across a seat and retained
in place by the inner cylindrical wall of the outer
ring, and a retractable tapered dog pivotally car
ried on each pin, each dog being normally radially 10
directed inward toward the center of the unit and
adapted to be retracted to assume a position
where it extends upwardly so its outer side bears
on and is substantially parallel to the inner wall
of the outer ring while its inner side extends up 15
wardly and outwardly.
Boynton __________ __ Aug. 7, 1923
Nelson __________ __ Mar. 2, 1926
Himes __________ __ Mar. 27, 1928
Wright et a1. ____ __ Sept. .15, 1936
Hoffoss __________ __ Apr, 26,
Stovall ________ __ Sept. 10,
Catland et a1 _______ __ Oct. 7,
Egerss __________ __ Aug. 10,
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