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Патент USA US2130580

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'
Sept. 20, 1938.
J. BUCKLES
Filed Sept. 26,
\\\„
2,130,580
Patented Sept. 20, 1938
2,130,58Ü
UNITED STATESPATENT OFFICE
2,130,580
INSIDE PIPE CUTTER
James Buckles, Goose Creek, Tex.
_ Application September 26, 1935, Serial No. 42,171
3 Claims.
'I‘his invention relates to an inside pipe cutter.
An object of the invention is to provide a pipe
cutter shaped to be inserted into a pipe, stuck in
a well bore, and adapted to cut by rotation.
Another object of the invention is to provide
a pipe cutter comprising a cutter body having
outwardly movable blades mounted therein nor
mally held in retracted position in combination
with a mandrel movable axially through the
10 body arranged to engage and move the blades
outwardly while the device is being rotated in the
pipe to be cut.
Another objectA is to provide a cutter of the
character described wherein the mandrel is nor
15 mally held in inactive position by a yieldable
spring or seat with means thereon for the ap
plication of liquid under pressure thereto to actu
ate the mandrel into Contact with the blades to
move the blades outwardly into cutting relation
20 with the pipe to be cut.
(o1. lei-_0.8)
pivoted at their upper ends on the cross-pins 5
and their lower ends are provided with the out
wardly directed bits 6. The blades are normally
held retracted by the llat springs ‘l whose upper
ends are fastened to the body and whose lower Ul
ends press against the outer sides of the blades
as shown in Figs. 4 and 5. Any desired number
of blades may be employed, three, the preferable
number, being shown.
.
Axially movable in the body l there is a
mandrel 8 and surrounding this mandrel there is
a strong coil spring 9 whose lower end is seated on
the inside shoulder I0 of the body and whose
upper end resists against the nut I I threaded on
the upper end of the mandrel. This nut may be
adjusted to regulate the tension on the spring 9.
The upper end of the body is formed with the
cylinder I2 and on the upper end of the man
drel, fitting closely within this cylinder, there is
a piston I3.
The mandrel 8 has an axial channel I4 there
A further feature resides in the provision of a
pipe cutter of the character described wherein through from end to end. The inner sides of
the mandrel constitutes also a weight suspended the blades 4, beneath the pins 5, are provided
from, and having a swiveling connection with, with the downwardly converging bearing faces
25 a wire line whereby the mandrel'may be low
I5, and the lower end of the mandrel B is tapered
ered into position to actuate the blades outwardly to engage said faces and force the lower ends of
into pipe-cutting position, or elevated.
` the blades outwardly upon downward movement
With the above and other objects in view the of the mandrel.
invention has particular relation to certain novel
In operation the cutter is lowered into the well
30 features of construction, operation and arrange
bore and into the pipe I6 stuck therein. Liquid
ment of parts, examples of which are given in this under pressure is then forced down through the
speciñcation and illustrated in the accompany
stem 2 and against the piston I3 and the mandrel
ing drawings, wherein:
8 will thereby be forced downwardly and will
Fig. 1 shows a vertical sectional view oi the gradually move the blades 4 outwardly, carrying
35 cutter.
the bits 6 into contact with the pipe to be cut.
Fig. 2 shows a cross-sectional view taken on the Meanwhile, suiiicient liquid will pass through the
line 2-2 of Fig. 1.
channel I4 to flush the bits and to keep them
Fig. 3 shows a cross-sectional view taken on cool during the cutting operation. When the pipe
the line 3-3 of Fig. 1.
I6 is severed, the liquid pressure may be released
4.0
Fig. 4 shows a vertical sectional view of an
other form of the cutter, showing the blades in
inactive position, and
Fig. 5 shows a fragmentary side view, partly
in section, of the form of cutter shown in Fig. 4,
45 with the blades in active position.
Referring now more particularly to the draw
ings wherein like numerals of reference desig
nate similar parts in each of the figures, the
numeral I designates a tubular cutter body
50 vadapted to be connected to the lower end of a
tubular operating string 2 whereby the cutter
may be rotated from the ground surface.
At its lower end the cutter body is provided
with the vertically elongated tubular slots 3 in
55 which the cutter blades 4 work. The blades are
and a spring 9 will withdraw the mandrel up
wardly allowing the springs 'I to retract the
blades and the tool may then be withdrawn fromv
the pipe.
In actual practice a spear is usually carried by
the operating string 2 so that when the cutting
is completed, the cutting tool may be lowered and
the spear engaged with the cut-01T section and
said section removed with the cutter, or the cut
ter may be withdrawn from the well, and a pipe
puller lowered into engagement with the cut-ofi
section, and said section removed preparatory to
making another cut.
In the form shown in Figs. 4 and 5, the man
drel 8a is in the form of an elongated weight
adapted to be let down through the cutter body ' 55
2,130,580
2
la to actuate the blades, as hereinabove ex
plained. This weight, or mandrel 8a, may be let
down and withdrawn through the instrumental
ity of the cable Il which has a swiveling connec
tion with the upper end of the mandrel 8a, as
shown in Fig. 4.
This swiveling connection is
necessary so that during the rotation of the cut
ter, the cable Il will not be twisted and injured.
In this form there is suilicient clearance between
the mandrel 8a and the body la, to permit liquid
I to circulate down to the bits iorilushing them
and keeping them cool.
f
v
In other respects the form shown in Fig. 4 is
the same as that shown in Fig. 1.
The drawings and description disclose what is
now considered to be preferred forms of the in
vention by way of illustration only, while the
' broad principle of the invention will be defined
20
by the appended claims.
VWhat I claim is:
1. A pipe cutter adapted to cut by rotation and
comprising a tubular cutter body having an in
side shoulder, outwardly movable blades whose
25
upper ends are pivoted to the body and whose
lower ends are swingable outwardly and formed
With outwardly directed bits, said blades having
downwardly converging inside faces, means nor
mally holding the blades retracted into inactive
position, a mandrel movable axially in the body
~30 having an adjustable stop thereon, a coil spring
on the shoulder and acting against the stop and
normally holding the mandrel elevated into in
active position, a piston on the mandrel above
the stop and fitted in the body, a tubular op
35 erating string to the lower end oi which the body
is attached and through which liquid under pres
sure may be forced against the piston to move
the mandrel downwardly against said faces to
force the blades outwardly.
2. A pipe cutter adapted to out by rotation
40
and comprising a tubular body whose upper end
is formed into a cylinder, said cylinder having an
inside annular shoulder- at its lower end, out
wardly movable blades whose upperY ends are
45
pivoted to the body and whose lower ends are
swingable outwardly and formed with outwardly
directed bits, the blades having downwardly con
verging, inside faces, means normally holding
the blades retracted into inactive position, a
mandrel movable axially in the body and ex
tended into the cylinder, an annular inside shoul
der in the body spaced beneath the lower end
of the cylinder, a coiled spring resting on said
last mentioned shoulder and supporting the
mandrel and normally holding it elevated into
inactive position, means on the mandrel for regu
lating the compression of said spring, a piston
on the mandrel fitted within the cylinder and
whose downward movement is limited by the
first mentioned shoulder at the lower end of the
cylinder, the lower end of the mandrel being
positioned to operate against said faces to force 15
the blades outwardly upon downward movement
of the mandrel.
3. A pipe cutter adapted to cut by rotation and
comprising a tubular body whose upper end is
' formed into a cylinder, outwardly movable blades 20
whose upper ends are pivoted to the body and
whose lower ends are swingable outwardly and
formed with outwardly directed bits, the blades
having downwardly converging, inside faces,
means normally holding the blades retracted into 25.
inactive position, a mandrel movable axially in
the body and extended into the cylinder, said
mandrel being tapered at its lower end to engage
the converging inside faces of the blades, a shoul
der in the lower end of the body, a coil spring 305.
resting on the said shoulder, and supporting
the mandrel and holdingthe mandrel normally
in inactive position, threads on the upper end
of the mandrel adapted to receive a nut for hold
ing said coil spring adjustably in place, a piston 35
in the cylinder above said coil spring, an internal
annular shoulder at the lower end of said cyl
inder vfor restricting the downward movement
of the piston, the upper end of the mandrel
being reduced and externally threaded, a nut
threaded onto said reduced end of the mandrel
for locking the piston in place and a tubular op
erating string above the piston for the passage
of fluid under pressure to operate the mandrel
downwardly.
JAMES BUCKLES.
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