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Патент USA US2135812

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Nov. s,v 1938,
s. .E. GRAY I
>
RIGID COUPLING FOR SUGKER RODS
'‘
2,135,812
'
Original Filed June 28, 1937
'. INVENTéR _
2,135,812
Patented Nov. 8, 1938
UNETED STATES
‘PATENT osie
2,135,812
- RIGID COUPLING FOR SUCKER RODS
Samuel E. Gray, Oklahoma City, Okla.
Application June 28, 1937, Serial No. 150,734
Renewed April 9, 1938
2 Claims.
(Cl. 287—108)_
My invention relates to‘ improvements in rigid 1 horizons difficulties are encountered which are
coupling for sucker rods, especially adapted to
prevent pump rods, cables and the like from being
disconnected when the said rods and cables are
rotated forward and backward in cleaning an
oil string or pipe of any kind.
The principal objects of my invention are to
provide a device of this character which is posi
tive in action, simple and inexpensive in con
10 structiom. new, novel and easily operated; which
is strong, durable, reliable and of evident utility;
which cannot easily get out of order and is effi
cient for the purposes for which it is intended;
to provide a device to be used as couplings for
15 rods and cables but which cannot be discon
nected by rotating the said rods and cables for
ward and backward in the usual manner; to
provide a barrel having internal threads at its
ends and an exterior wrench hex intermediate
20 said ends, the bore of the said internal threaded
parts changing to inclined hopper-shaped cavi
ties diminishing toward the mid section of said
barrel and forming a narrow opening there
through; to provide threads and threaded collars
25 for the ends of the sucker rods being coupled
together, the extreme ends of said rods being
ground down to blunt wedges for seating in the
said hopper-shaped cavities of the said barrel
and to provide plugs for holding said collars and
30 wedges rigidly in said barrel.
With these and other objects in View my in
vention consists of the construction, novel fea
tures and combination of parts hereinafter more
fully described, illustrated in the accompanying
35 one-sheet drawing and pointed out in the claims
hereto appended. Various changes in the form,
proportion, size, shape, weight and minor details
of construction, within the scope of my invention
may be resorted to without departing from the
40 spirit or broad principle of my invention or
yielding any of its bene?ts.
In the accompanying drawing, Figure l is an
enlarged side elevation, partly in section, of the
assembled device; Fig. 2 is an elevational view
45 of two of the assembled devices, the sucker rods
being broken away; Fig. 3 is a sectional view on
the line 3-3 of Fig. 1 and Fig. 4 is a perspective
view of the end of a sucker rod showing the
threads, threaded collar and wedge.
50
In the following description like reference
numbers designate like parts in all the ?gures,
and it is to be understood that the drawing is
to be interpreted as being illustrative and not
restrictive.
55
In the recovery of oil by pumping from deep
not found in shallow production. The pump
cylinder is located at the bottom of the well, and
when this is at a depth of some 6500 feet the
sucker rod to actuate the pump cylinder must 5
be about, one and one-fourth miles long. The
casing and oil string to this great depth are not
perfectly straight and perpendicular but sinuous
and perhaps slanting. It is frequently necessary
to clean the oil string or loosen the sucker rod 10
when it gets stuck by rotating the said rod. Rods
coupled with pin and. box connections can be
rotated or twisted clockwise Without disturbing
the couplings but when turned counter clock
wise some one of the numerous couplings in a 15
long string usually gives way to the torsional
stress and a ?shing job ensues. Or when a rod
of great length is twisted clock-wise until the
torsional stress endangers the strength of the
rod and it slips or is released suddenly, the back- 20
lash of the unwinding rod may cause it to turn
counter clock-wise and uncouple the rod.
Other means of coupling rods. are in use besides
the pin and box method, such as a hook and a
half turn look, but this weakens the joint and 25
causes it to break. My improved rigid coupling
obviates these di?iculties as it becomes an in
tegral part of the rod and may be turned in
either direction without becoming disconnected.
While the drawing and this speci?cation are 30»
are directed toward the use of my device in con
nection with solid rods, it can be easily applied
to making splices or coupling wire cables and
will serve as e?iciently therewith and I am there
fore not restricting its use to rods alone.
35
One embodiment of my invention is shown as
follows: The barrel or cylinder I has smooth ends
2 and a wrench hex 3 intermediate thereof. The
ends 2 have interior threads 4 and unthreaded
bores 5 extending inwardly from said threads 4. 40
Extending farther inwardly as a continuation of
said bores 5 are the inclined hopper-shaped cavi
ties 6 which meet at ‘l in a narrow slit forming
an opening‘ through the said barrel l.
Sucker rods 8 have their ends threaded at 9, 45
the said ends are ground to form wedges at Ill
‘with blunt points ll. Threaded collars l2 are
seated on the perfect threads 9 back from the
wedges It] on the ends of rods 8. Wedges l0 seat
tightly in the cavities 6 and collars l2 ?t snugly 50
within the bores 5. Plugs l3 have threads M for
registering with threads 4 of barrel l and are
provided with wrench hexes [5.
In coupling two sucker rods or the like to
gether the device is assembled as follows: Plugs 55
2,135,812
2
13 with smooth inner bores l8 are slipped over
the interior of the said barrel having smooth
the threaded ends 9 of rods 8. Collars l2 are
screwed on the ends 9 of said rods 8 to proper
{and extending inwardly therefrom, hopper
positions relative to the wedges I0 thereon. Rods
r.
8 are inserted into the ends of barrel I until
wedges ID are seated tightly in cavities 6 and
/ collars [2 are partly within bores 3. Plugs l3 are
screwed in until inner edges l6 thereof seat
?rmly against the co-acting edges I‘! of collars
l2, thus locking the coupling rigidly and making
10
it an integral part of the sucker rod.
It will be noticed from a study of Figs. 1 and
2 that the coupling in place on the sucker rod,
forms a smooth, “stream-lined” connection, de
void of any sharp angles or sudden change in
15
size or shape, thereby reducing. frictional losses,
in reciprocating the sucker rods, and further,
that turning or rotating the said‘ rods- in either
direction cannot unscrew or disconnect the
20 coupling.
Having thus described my invention what I
claim as new and desire to secure by Letters
Patent is:
'
1. A coupling of the character described, in
nr
cluding a barrel or cylinder having threaded re
cesses formed within the ends‘ thereof, the ex
terior of said ends having smooth walls with a
wrench hex midway of the length of the barrel,
bores at the bottoms of the threaded recesses
shaped cavities meeting in a narrow slit forming
an opening through the said barrel.
2. In a coupling of the character described, in
combination, a barrel or cylinder with threaded
recesses formed within its ends, the exterior of
said ends having smooth walls with a wrench
hex intermediate the length‘of the said barrel,
the interior midsection of the barrel having
smooth bores continuous with the said threaded
recesses and changing to hopper-shaped cavities
meeting in a narrow slit forming an opening
through the said barrel, sucker rods threaded
at their ends, portions of the threads being
ground oil to form wedges with blunt points,
said wedges being adapted to seat ?rmly in the
hopper-shaped cavities of the said barrel,
threaded collars for coacting with the threaded 20
ends of the sucker rods and seating snugly in
they bores of the barrel aforesaid, and smooth
bored threaded‘ plugs having wrench hexes,
adapted, for registering in the said threaded re
cessesland coacting with the said collars for look 25
ing the sucker rods within the said barrel.
SAMUEL E. GRAY.
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