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Патент USA US2115166

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April 26, 1938.
Filed Jan._ 2, 1937
/ ,4,
Patented, Apr. 26, 1938
2,115.1“ .
001m carcnun
John Ho?oss, Houston, Tex., assignor to Reed
Roller Bit Company, Houston, Tex., a coma
ration of Texas
Application January 2, 1937, Serial No. 118,724
6 Claims. ’
(Cl. 255-72)
This invention relates in general to core drills
for use in taking samples of the formation dur
ing the drilling of a well or the like, and more
particularly has reference to a device commonly
5 known as a core catcher, which device is located
adjacent the lower end of the barrel for receiving
the core, and is for the purpose of breaking the
core off, and for holding the core and prevent
ingit from dropping out through the bottom of
10 the core barrel during the time that the core bar
rel is being drawn up to the top of the well.
It is an object of this invention to provide a
core catcher which shall be of simple construc
‘ tion and efficient in operation.
More speci?cally it is an object of this inven
tion to provide a core catcher which will be less
expensive to manufacture than previous core
catchers, and which will be unfailing in its op
One other object of this invention is to provide
a core catcher composed of .a relatively small
number of component parts requiring the least
possible amount of labor to produce and assem
One other object of this invention is to provide
a core catcher which may be used for breaking
and retaining a core from practically any type
the core catcher taken along the line 4-—4 of
The core barrel illustrated in Fig.1 is shown as
being located within the lower end of the core
barrel I and held in place therein by means of
a shoulder in the lower portion of the core bit 2.
The principal part of the core catcher illus
trated comprises the body 3 which is formed with
a 'plurality of slots therein extending from' its
lower end upwardly as illustrated at 4. Within 10
these slots 4 there are disposed'core catcher ?n
gers 5 and 6, these ?ngers being rotatively
mounted upon a, ring 1 of circular cross section
which surrounds the lower end portion of the
body 3 and snapped into place in a groove formed
in the exterior of this body member.
A second ring-like member 8 ‘of L-shaped cross
section encloses the lower end of the body 3, and,
is formed with slots extending from its upper
edge downwardly corresponding in position to 20
the slots 4 within the body member 3 and so ar
ranged as _to register with the slots 4. This mem
ber is likewise formed with an internal groove
adapted to receive the outer portion of the ring ‘I,
and to retain this ring in position on the body 25
member 3. The ring 8 is‘ secured to the body
member 3 by means of rivets 9 or the like.
Within the upper end portion of the core
body, this body is made of slightly en
Another object of this invention is to provide larged diameter
for the purpose of receiving the 30
a core catcher which will be extremely durable spring‘member ill
in the form of a ring which
and require a minimum of repair and attention. exactly ?ts within the upper end portion'of the
Another object is to. provide a core catcher body 3. This spring ring I0 is preferably se
which when it requires repairs may be repaired cured in position by means of spot welding H,
with the least possible expenditure of labor and
of ‘formation.
or other suitable means.
35 material.
One other object is to provide a core catcher
Extending downwardly from the spring ring l0 ‘
in registering relation with a portion of the slots
which will present a smooth internal bore so as - 4 are spring ?ngers l2, and other spring ?ngers
to permit the core to enter and pass freely there
13 extend downwardly in registering position with
to the remainder. of the slots 4. The 40
Other objects and advantages ofthis invention respect
spring fingers [2 are so arranged as to contact
will become apparent from the following descrip
rear surfaces of the core catcher elements 6
tion taken in connection with the accompanying. the
and the spring ?ngers l3 likewise contact the rear
drawing, wherein one embodiment of this inven
surfaces of thecore catcher elements 5. These
tion is illustrated. It is to be understood that spring ?ngers it will be seen are, therefore, in
45 this embodiment and
such position that they customarily urge the core .
of limitation, but by w y of explanation and il- ' catcher elements 5 and 6 ‘toward the center of . >
lustration, and that this invention is limitedin its
scope only by the prior art, and by the terms of
the appended claims.
In the drawing:
‘Fig. 1 is a, vertical cross sectional view illus
trating a core catcher constructed in accordance
with this invention, and showing its relation to' a
55 core bit when in use therein.
Fig. 2 is a top plan. view of the core catcher il
lustrated in Fig. 1.
Fig. 3 is a horizontal cross section of the core
catcher only taken along the line 3-3 of Fig. l.
Fig. 4 is a vertical cross section of one side of
the path of the core as it moves upwardly into
the core barrel.
The core catcher elements 5 and 6 are prefer
ably of the type employed for catching and re-_
taining cores cut from rock, shale, and other
solid or substantially solid substances. Where it '
is proposed that the core catcher of this inven-'
tion shall be usedfor soft formation cores, addi
tional spring ?ngers “will be provided extend
ing upwardly from the ring shaped spring mem
ber it). These spring ?ngers will be curved to
ward the center of the path of a core entering
the core barrel, and will themselves serve as core so
catcher elements to assist in retaining cores of
soft formation. It will be understood that the
spring ?ngers Il may be omitted under certain
a core catcher has been provided which is ca
pable of carrying out all the objects and advan
tages sought by ‘this invention.
Having described my invention, I claim:
It will be understood from'the foregoing that y
1. In a core catcher‘ assembly, a ring-shaped
in the course of taking the core with a core drill body member having openings in the inner walls
equipped with the core catcher described, the thereof, core catcher elements pivotally mounted
core drill will be rotated in the ordinary manner within said openings to lie entirely therein when
to cut the core, and the core after it is cut will' in their upper position, and swin'gable down
10 pass upwardly between the core catcher elements wardly and inwardly from such position, and.a 10
I and 6 moving them to the position illustrated
.in Fig. 1 against the tension of the spring ?ngers
single spring element having portions acting on
said‘ core catcher elements, respectively, and urg
J2‘ and i3. After the core passes upwardly it will
ing them toward such downward and inward posi
- also come in contact with the inner surface 101
16 the spring ?ngers II, and will press them out
2. In a core catcher assembly,.a ring-like body-15
.wardly so that they will lie substantially ?at . part, core catcher elements mounted therein for
against the inner wall ofthe core barrel and downward and inward swinging movement to reppermit the core to pass upwardly therein.
when the core has reached the length desired,
the cutting of the core will cease and the core
barrel, including the core catcher, will, be moved
tain a core and a single spring element having a
plurality of arms cooperating respectively with .
said core catcher elements and urging said core 20
. catcher elements downwardly and inwardly. '
This will cause the core catcher
elements 5, 6, and“ to swing inwardly and sepa
3. In a core catcher assembly, a ring-like body
member having slots formed therein, a second
rate the core from the formation at its lower ring-like member extending about 1 said body
end, and thereafter retain the core within the' member adjacent said slots,‘ a plurality of core 25
core barrel. The ?ngers I and 6 will, of course, catcher elements swingably mounted on said last
be'caused to move inwardly when the core bar-. mentioned'ring-like member and extending into
rel is pulled up because of the tension of the, said slots and adapted to swing downwardly ‘and _
spring ?ngers VI: and it thereagainst, while the
inwardly with respect to said body member, and,
elements ll will move inwardly because of their
means surrounding said body member and over- so
own inherent tendency to assume the position
lying said second ring-like member to retain '
illustrated in Fig. l.
said second ring-hike member'in position on said’
body member, said secondring-like member in
' It isv to be noted that in‘ theoonstruction il
lustrated, there is provided a structure having ' terconnecting said ring-like 'body'and said last
a substantially smooth internal bore which will
otter practically novresistance to the passage of
a core therethrough in an upward direction. This
is because the elements I and 8 are mounted
4. In a core catcher assembly, a ring-hire body
member having its upper portion of enlarged in-'
ternal diameter, a plurality of core catcher ele
within the slots 4, and when in their up posi
- ments mounted within said body -member for‘ .
40 tion their inner surfaces are substantially ?ush
with the inner walls’of the body member 3. In
addition, the body member I is made of slightly
downward and inward swinging movement with '40
respect thereto, and a ring-like spring member ‘
?tted within the upper portion of enlarged diam;v
larger‘ diameter where it is to‘ receive the spring. eter on said body member and having parts en- member ID so that the inner surface .of this
spring member ID forms a substantially smooth
continuation of'the inner surface of the lower
portion of the body member 3.
, ‘
-It is further to be noted that there‘ are a
‘minimum number of parts involved in this con
gaging said core catcher elements and urging,
them to swing downwardly and inwardly with 45
respect to the body member.
5. Ina core catcher assembly, a ring-like body
member, a plurality of core catcher elements
mounted within said body member for downward
struction, all of the spring members being formed ' and inward swinging movement with respect 5.
in one piece, and all of the core catcher ele
ments I and Q having a single member form
ing the' axis therefor. Moreover, the only secur
thereto, and a ring-:like'spring member mounted
within said body member, and having parts co
operating with said core catcher'elementsto urge.
ing operations required in assembling the dc? the same downwardly and inwardly with respect '
vice are the steps of spot welding the spring . to said. body member, said ring-‘like spring mem- 55
member II in place’, and of placing the rivets I
her also having parts extending upwardly and
in position. The device is thus capable of being ' inwardly therefrom and adapted to serve as‘ core
assembled with the least amount‘ of labor and
catcher, elements.
6. In a core catcher assembly, a ring-like body
, ,In addition to thecforegoing. it is‘ to‘be noted
member, a second ring-like member extending m .
that if forinstance the spring member ill should
become damaged and require replacement, it is
about said body member, a plurality of core’
catcher elements swingably‘mounted on said last
mentioned ring-like member and adapted to
only necessary to break loosethe spot welding I I,
withdraw theldamaged member, replacing it with swing downwardly and inwardly with respect to
a new member andpspot welding the new mem
her in place. Also, if one of the elements 5 or 6
should become damaged and require replace
ment, it is only necessary to remove the rivets 9,
slip the ring member 8' from the end of-the body
70 member 3, and remove the damaged element,
replacing it with arnew one by a mere reversal
of'this process.
~ From the foregoing. it will be appreciated that
said body member, and. means overlying said 65
second ring-like member to retain said second
ring-like member in position on said body mem_—_
her, said second ring-like member having parts
engaging said ring-like body member'and said
means, respectively, for securing said means .in 70
place on said body member.
I .
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