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Патент USA US2113821

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April .12, ‘1938.
L. F. BAASH
' 2,113,821
SAFETY JOINT
Filed Feb. 24, 1936
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2,113,821
Patented ‘Ape-1a, 1938
UNITED vS'I'ATES PATENT OFFICE
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2,113,821
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sam'rr Jom'r
Lawrence F. Baash, m Ant?les, Calif.
Application February 24, 1936, Serial No. one“
9 Claims.
(crass-2s)
I
a
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are enlarged transverse detailed sectional views
taken as indicated by line 4-4 on Fig. 2 and line
5—5 on Fig. 1; respectively.
This invention relates to a connection. or joint
and relates more particularly to a safety joint
for use in a well drilling string. A general ob
ject of this invention is to provides. practical,
The improved'safety joint of this invention
includes, generally, two sections A and B having
- 5 effective and dependable safety joint.
cooperating threads “I, shoulders II and I2- on
the sections A and B, respectively, de?nitely
equipment that is capable of ‘dependably trans- ' limiting threading together of the sections and
mitting rotation and longitudinal forces during control means or detent means I3 resisting or 10'
10 drilling and other operations and that may be . controlling unthreading of the sections A and B.
The sections A and 2B are adapted to be con
easily released or disconnected when desired or , nected with, parts or members of a well drilling
necessary.
‘ Another object of this invention is to provide string S to form a connection between them.
The joint sections-A and B are elongate parts
a safety joint of the character mentioned‘ that and
are telescopically assembled one section be 15
15 may be readily released or disconnected when ing an
inner part and the other section being an
connected in a drilling string in a well bore by
Another'object of this invention is to provide
a safety joint for use in a string'of well drilling
merely turning the string in a reverse or left
hand‘ direction.
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outer part. In vthe particular relationship illus
» trated the section A is the-upper section of the
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Another object of this invention is to provide
:0 a safety joint that will not become loosened or
disconnected by back-lash or relatively unre~
sisted reverse rotation of the drilling'string.
Another object of this invention is to provide
a safety joint of the character mentionedthat
cannot become excessively tightened or jammed
by the application or transmission of heavy for
‘ ward rotational forces or by heavy longitudinal
strains and, therefore, maybe easilyreleased at
any time.
30.
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Another object of this invention is to provide
a safety joint of the character mentioned whose
release or disconnection is controlled so that it
cannot be released by-unintentional or unavoid
able reverse rotation but may be easily released
by the'positive application of reverse torque of
a known magnitude followed by reverse rotation
of the string.
_
'
Another object of this invention is to provide
a safety joint that embodies a novel spring urged
control pin or detent normally resisting discon
nection of the joint sections. and that releases or
yields only upon subjecting‘ the joint to a re
verse torque of a known or predetermined mag
'
nitude.
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_
lustrated in the drawing may be reversed. The
section A is provided at its upper or outer end
with means for connection with the string S. In 25
the case illustrated a tapered socket I4 is pro
vided in the upper or outer end of the section A
to receive a threaded pin IS on a tool joint sec
tion or other part of the ‘string S. The upper
or outer exposed portion of the section A may
be cylindrical and of the same diameter as'the
adjacent part of the ‘string S. The major inter
mediate portion of the joint section A is reduced
in diameter being in the nature of a stem IS.
The stem l8 carries a thread Ill. The thread
lllxis coarse or heavy and has a substantial pitch
or lead. The inner or lower portion ll of the
stem I6 is. reduced in diameter and is prefer-'
ably cylindrical. A central longitudinal ?uid
passage l8 extends longitudinally through the
of the sectionv A and is provided at its lower or
outer end with means for connecting the string 45
The various objects and features of my inven
‘ tion will be fully understood from the following
tion B to thread in a socket 20 in a tool joint
which description reference is madeto the ac
companying drawing, in which:
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Fig. 1 is a side'elevation of the safety joint
provided by this invention fully made up or con
nected. ‘Fig. 2 is a fragmentary side elevation
of the safety joint showing the stop shoulders in
the released condition. Fig. 3 is an enlarged lon
gitudinal detailed sectional view taken as indi
m cated by line 3-‘3 onvFig. -1 and Figs. 4. and 5
40 .
section A from the bottom of the socket M to
the end- of the stem portion H.
The section B is formed to receive the stem iii
S. In the particular embodiment of the inven
tion shown; in the drawing a tapered pin I9 is
_ and application ‘of my invention, throughout
55
that the positioning of the sections A and B il
A further object of this invention is to provide
an improved ‘safety joint of the character men
tioned that is simple and inexpensive.
detailed description of a typical preferred form
.
joint and constitutes the inner part of the joint
while the section B is the lower part and forms 20
the outer part of the joint. It will be obvious
provided on the lower or, outer end of the sec
section or other part of. ‘the string S. The joint 50
section B may be cylindrical in its external con
?guration and may- be of substantially the same
diameter as the exposed portion of the [section
A and the adjacent members of the string S.‘ A
socket or opening 2| extends longitudinally 55
through the section' B from its upper or inner
end. The opening 2| is provided to receive the
stem Ii of ' the section A and has a thread H)
on its wall for cooperating, with the thread III
of the. stem IS. The opening 2| has a reduced 60
2,113,821
' 2
inner or'lowerpo'rtion 2|“ for receiving the por
The means I3 includes a spring pres‘sed‘latch pin
tion H of the stem I6. A ?uid passage 22 con
or detent 30 on one section of the joint for co
tinues downwardly or outwardly from the openi
ing portion 2|“ to conduct the circulation ?uid
to the adjacent member of the string S.
Packing means may be provided for sealing be
tween the joint sections A and B to prevent the
operating with a recess or socket 3| in the other
section. In the particular form of the invention
illustrated the detent 30 is ‘provided on the joint
section B and the socket 3| is provided in the
section A, it being understood'that, this relation
leakage ‘of circulation'fluid from the passages‘ I8
and 22. An annular groove 23 is provided in the
ship between the detent-landlsocket'mayibe re
versed if desired. A_lateral or radial opening 32
portion I‘! of the stem I6 and carries a ring 24
is provided in the wall of the section B to carry
of rubber or other suitable packing material.‘ the detent 30. The opening 32 extends through
Ports 25at are provided in the stem portion," to the wall of the section B to communicate with
extend outwardly from the passage I8‘-‘to the.‘ the inner portion 2Ia of the opening 2I. The de
groove 23 so that the inner surface of the pack
tent 3Ilyis in the nature of a control pin having
a head~30adapted to project from the opening 15
15 ing ring 24 is subjected to the action of the ?uid
pressure in the passage which urges the pack
32 to cooperate with the socket 3I. ' In accord
ing ring 24 into tight sealing cooperation with the
wall of the opening portion 2Ia.‘ ‘The ?uid pres-‘
ance with the invention the head 33 of the de
tent'30 is tapered or conical. The extreme outer
end of the ‘head 33 may be flat so that particles
, sure actuated packing ring 24 effectively prevents
20 the outward leakage of the vcirculation ?uid and,
of .dirt inthe socket 3| will not'preve‘nt the proper 20
cooperation between the head and ‘socket. The
recess or socket 3| is‘ shaped to accurately or
therefore, prevents erosion or cutting action of
the parts.
‘
The shoulders II ‘ and’ I2 for ‘limiting the"
properly receive the head 33 of‘the' detent 30.
threading together of the joint sections may be
25 provided on any suitable convenient or practical"
opposing faces or parts of the joint sections. In
The recess or socket. 3| is conical or of inwardly
diminishing cross section and is‘proportioned so
that the detent head 33' has substantially even
the typical preferred embodiment of the inven
tion illustrated in the drawing the shoulder II
cooperation with its wall. .
occurs on the upper or inner end of the section
30 B and the section I2 isrprovided on the section
A at the upper or outer end of its stem I6. The
stem I6 being reduced in diameter provides the
section A with an annular downwardly facing
shoulder or surface 25. The shoulder I2 ‘is pro‘
-35 vided on the wall or surface 25. The shoulders
»II and I2 are positioned to oppose or face one
?rm cooperation with the socket 3|- The ?ange
36 is adapted to cooperate with a shoulder 31 on
the wall of the opening 32 to prevent inward dis
placement and loss of the detent 30 when the
joint is disconnected‘. The strength of the spring 40
35, the size of the detent head 33 and the socket
3| and the taper of the head \33 andthe socket
wall determine the reverse torque necessary to
The shoulder I2 on the section A faces forwardly
40 or in the direction of turning of the section A re
quired to thread its stem I6 in the opening 2|,
while the shoulder II on the section B facesin
the opposite direction. The shoulders H and I2
are preferably substantially vertical or in a plane
to
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spring 35 is arranged in the opening 32 under
compression between the plug 34 and a suitable
flange 36 on the detent 30. The spring 35 is suffi
ciently strong to urge the detent‘head 33 into
another and their engagement de?nitely limits
the threading together of the sections A and B.
45 extending longitudinally of the joint.
"
Spring means is provided to urge the detent
.30 inwardly so that its head 33 forcibly cooper;
ates with the socket 3|. A plug 34 is threaded 30
in the outer portion of the opening 32 and a
release- the ‘detent head from the recess and ini
In order
tial unthreading of the threads Ill. The detent 45
to provide for the proper cooperation of the
shoulders II and I2 the inner or upper end 26
of the section B and the surface 25 of the section
A are helicoidally pitched or spiralled to be con
tinuous surfaces‘ terminating at the bases and
upper ends of the shoulders II and‘ I2. The sur
faces 25 and 26 are pitched in the same direction
as the threads I0 and have substantially the same
30 and the socket 3I are positioned and related
to fully cooperate when the shoulders II and I2 .
are in engagement .so that there is no slack or
play in the joint when the joint is fully made up.
In the use or operation of the safety joint pro
vided by this invention the parts are assembled
as illustrated in Fig. 3 of the drawing and the
joint is connected in the string S as shown in
I ‘lead or degree of pitch as the threads Ill. The 7 Fig. 1 of the drawing. When the parts are prop
55 shoulders II and I2 are positioned and related erly assembled the shoulders II and I2 are in
engagement and the detent head 33 is bearing
in the tapered socket 3|. When the string S is
rotated or otherwise manipulated in the well bore
to cooperate to prevent further threading to
gether of the sections A and B before the threadsv
II) are fully tightened down or tightly engaged.
The shoulders II and I2 are of such extent that
60 the surfaces 25 and 26 are in engagement or im
the shoulders I I and I2 cooperate for the posi
tive transmission of forward or righthand rota
_ mediately adjacent one another when the shoul
ders II and I2 are in engagement and are free
to pass one another, as shown in Fig. 2, upon the
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60
tive forces and their engagement prevents tight
ening or jamming of the threads ID by such
The surfaces 25 arid 26 may, cooperate
forces.
for the transmission of compression strains to
relieve the threads II]. The threads III, of course, 65
The control means or detent means I3 is anr effectively-transmit tensile strains during rais
important feature of the present‘inve'ntion and ing of the string S and similar operations. The
together with the shoulders I I and I2 assures the head 33 of the springurged detent 30 cooperates
dependable operation and release of the safety with the socket 3I to dependably resist loosen
ing or unthreading of the joint during operation 70
70 joint. The control means I3 operates to yield
ingly resist unthreading of the sections A and B or manipulation of the string S. The head 33
so that the joint does not become loosened dur ' islforced into the socket 3I_ with sufficient pres
ing operation of the string S and can only be sure to dependably prevent loosening or un
disconnected by intentional positive turning of threading of the sections A and B due to back
completion of one revolution between the sections
65 Aand B in the thread-loosening direction.
7.5 the string S in thf: thread loosening direction.
lash in the drilling string and prevent unthread
' 2,118,821
ing of the joint when the string is turned under
little torque to operate and control certain well
tools. The circulation ?uid is free to pass down'-.
wardly through the joint with a minimum resist
ance and turbulence and is prevented from leak
ing between the sections A and B by the ?uid
pressure actuated packing ring 24. As the
threads I0~ are not subjected to the tightening
3
.
applied to the sections in the unthreading direc
tion.
v3. A safety joint comprising, two threadedly
connected sections, an opening in one section,
shoulders on the sections spaced from the open
ing and cooperable to limit threading together of
the sections, and a retractile detent on the other
section related to the shoulders to cooperate with
action of forward torque and compression
the opening to yieldingly vresist unthreading of
strains they do not become jammed or strained.
When it becomes desirable or necessary to re
lease or disconnect the safety joint the string 8
the sections when the shoulders are in coopera
tion.
. is turned in a direction to unthread the threads
10
4. A safety ‘joint comprising, two threadedly
connected sections,-abutments on the sections
limiting threading together of the sections, and
Ill. The cooperation of the detent head 33 with
the socket 3| may resist this rotative force until
su?‘icient torque has built up in the string to
overcome the action of the spring 35. In prac
tice the degree of torque or rotative force neces
when the abutments are in cooperation.
5. A safety joint comprising, a section having
sary to release the detent 30 may be known or
an opening, a section having a stem threaded in
detent means remote from the abutments for 15
yieldingly resisting unthreading of the sections
determined so that the safety joint may be read - the opening, shoulders on the sections limiting
ily disconnected when desired. It is believed threading of the stem in the opening, there being
a socket in the outer periphery of the stem and
that it will be apparent how relative turning be
spaced from said shoulders, and a retractile
tween the sections A and B in a direction to un
thread the threads Ill causes slippage between spring pressed detent on the ?rst mentioned sec
the surface of the tapered detent head 33 and tion cooperating with the socket when the shoul 25
the wall of the tapered socket 3| which slippage ders are in cooperation to yielding'ly resist un
threading of the stem from the socket.
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"
results in retraction of the detent 30 in the open
6. A safety joint comprising, a section having
ing 32. Following'retraction of the detent head
’ 33 from the socket 3! the sections A and B may
an opening, a section having a stem threaded in
the opening, opposing surfaces on the sections,
be readily unthreaded. With the particular ar
rangement of parts illustrated in the drawing shoulders on said surfaces extending longitudinal
the stem l6 of the section A may be readily ly of the sections cooperable to limit threading
of the stem in the socket, there being a socket
threaded upwardly out of the opening 2|. Fol
lowing the unthreading or disconnection of the ‘in the stern, and a spring pressed member on
‘sections A and B the portion of the drilling string
S above the joint may be removed from the
the ?rst mentioned section releasably cooperat~ 35
ing with the socket to yieldingly resist unthread
ing of the stem from the socket and retractable
well, together with one of the sections A or B.
Having described only a typical preferred form ' from the socket by a substantial unthreading
and application of my invention I do not wish to force.
be limited or restricted to the speci?c details
herein set forth, but wish to reserve'to myself
7. A safety joint comprising, a section- having
40
any variations or modi?cations that may appear
an opening, a section having a stem threaded in
the opening, opposing helical surfaces on the sec
to those skilled in the art or fall within the scope
of the following claims.
Having described my invention, I claim:
tions terminating in axially extending shoulders
cooperable to limit threading of the stern in the
socket, there being a tapered socket in the stem, 45
1. A safety joint comprising, two threadedly
connected sections, an opening in one section, a
a spring urged member on the ?rst named sec
tion, and a tapered head on the member cooper
atingwith the socket to resist unthreading of the
spring pressed member carried by the other sec
tion cooperating with the opening to offer sub.
stantlal resistance to unthreading of the sec
tions, the cooperating surface of the member
and the wall of the opening being'pitched to
torque'on the sections.
cause retraction of the memberwhen torque of a
certain magnitude is applied to the sections in
the unthreading direction, and shoulders on the
and a shiftable detent on one section at a point
sections extending substantially longitudinally
stem and retractile from the socket by a known
50
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8. A safety joint comprising, two threaded to
gether sections, parts on the sections for de?
nitely limiting threading together of the sections,
55
remote from said parts cooperating with the
in relative positions where the member is receiv
other section to offer resistance to unthreading of
the sections and retractable by substantial
torque applied to the sections'in the thread loos
able in the opening.
ening
thereof to limit threading together of the sections
_
2. A safety joint comprising, two threadedly
connected sections, shoulders on the sections en
gageable to de?nitely limit threading together of
the sections, an opening in one section spaced
from the shoulders, and a spring pressed mem
ber carried by the other section to cooperate
with the opening when the shoulders are in en
gagement to offer substantial resistance to un
threading of the sections, the cooperating sur
face of the member and the wall of the open
ing being pitched to cause retraction of the
member when torque of a certain magnitude is
direction.
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9. A safety joint comprising, two threaded to
60
gether sections, axial shoulders on the sections
limiting threading together of the sections, a re
tractable detent on one section remote from said
shoulders, and surfaces on the detent and said
other section engaging to offer substantial re
65
sistance to unthreading of the sections when the
shoulders are in cooperation and cooperable to
cause retraction of the detent under a de?nite
thread loosening torque on the sections.
70
LAWRENCE F. BAASH.
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