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Патент USA US2134796

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Patented Nov. 1, \1938
2,134,796
UNITED STATES PATENT OFFICE
2,134,796
PIPE CUTTER
Fred N. Osmun, Houston, Tex.
Application October 26, 1937, Serial No. 171,087
9 Claims. (Cl. 164-017)
This invention relates to a pipe cutter.
It is an object of the invention to provide an‘
inside pipe cutter adapted to cut by rotation and
embodying novel means whereby the cutter may
be anchored in the pipe to be out, released, and
reanchored if desired, for another out.
It is another object of the invention to provide,
in a pipe cutter, novel means for actuating the
the tubular gland 5 having the inside, annular
groove 6 to receive a packing.
In the cutter body there is a tubular cutter ac
tuator 1 whose upper end has an external, annu
lar ?ange 8. A strong coil spring 9 surrounds the
actuator and is supported on the seat 2.
The
cutters‘ into‘, and maintaining them in, cutting
?ange 8 rests on this spring and thereby supports
the actuator. A packing I0 is seated in the
groove 3 and closely surrounds the actuator form
ing a ?uid tight joint between it and the body.
body of liquid through which the weight of the
operating string may be applied to actuate the
15 cutters outwardly into cutting position and where
by the cutters may be automatically controlled
pivotally attached to the lower end of the actu
ator and whose lower ends work through the
guides 4.
The body I encloses a cylindrical chamber I 2
in which the piston I3 is mounted to reciprocate.
10 relation with the pipe to be severed.
‘
It is another object of the invention to pro
vide in a pipe cutter, means. including a con?ned
to regulate the feed thereof to the pipe to be cut.
There are the cutters ll whose upper ends are
Extending upwardly from the piston, through the
A further object of the invention is to provide - gland 5, there is a tubular stem l4 which is close
an inside’ pipe cutting tool adapted to cut by rota
20 tion and embodying novel means, which are au
tomatically regulated, for feeding the cutters to
the work.
With the above and other objects in View the
a.
invention has particular relation to certain novel
features of construction, operation and arrange;
ment of parts,‘ an‘ example of which is given in
this speci?cation and illustrated in the accom~
panying drawings, wherein
2.0
Figure 1 shows a side view, partly in section, of
the upper end of the tool, shown in inactive or
non-cutting position.
"
Figure 2 shows a side view, partly in section, of
the lower end thereof.
Figure 3 shows a cross-sectional view taken on
'- the line 3-3 of Figure 1.
Figure 4 shows a side View, partly in section, of
the upper end of the tool shown in active, or cut
ting position.
ly surrounded by a packing l5 seated in the groove
6. A tubular operating string [6 is attached to
the upper end of the stem I4 and extends to the
ground surface whereby the tool may be lowered,
elevated and operated.
A tubular stem I1 is attached to the lower end
of the piston l3 and extends downwardly into 25
the cutter actuator 1 and is closely surrounded
therein by a packing l8 seated in the groove [9
of said actuator. Fluid tight joints are thus pro—
vided between the stem l4 and the gland 5 as
well as between the actuator ‘l and the body I 30
and also between said actuator and the stem IT.
The piston i3 is provided with a channel 2|]
therethrough from the lower to the upper end
thereof and the upper end of this channel is re
duced and extends through the plug 2| screwed
into the upper end of said piston as more clearly
shown in Figure 4. The piston l3 also has a chan
nel 22 leading from the upper to the lower vend
Figure 5 shows a side view, partly in section,
thereof of somewhat greater capacity than the
Figure 6 shows a side View, partly in section, of
the complete tool, shown in inactive, or non-cut
is provided with a valve seat 23 screwed into the
40 of the lower end thereof, and
ting position.
Referring now more particularly to the draw
ings wherein like numerals of reference designate
similar parts in each of the ?gures, the numeral l
designates the tubular cutter body whose lower
end is inwardly thickened forming an inside, an
.50 nular shoulder 2 providing a spring seat and
which has an inside, annular groove 3 to receive a
packing and beneath said groove the body is pro—
vided with the downwardly and outwardly di
verging guide ways 4.
Attached to the. upper end of the body there is
0
channel 20.
The upper end of the channel 22
upper end of the piston I3 and which is controlled
by the downwardly opening back pressure valve
24 as shown in Figures 1 and 4.
Surrounding the stem I1 and suitably anchored
thereto there is a saucer-shaped, ?exible disc 25
whose free margin rests against the lower end of
the piston I3. The lower end of the piston has a
radial guide way 26 in which the lower end of the
channel 20 terminates, as shown in Figure 3 and
a valve 21 is mounted to move in said guide way
and is fastened to the margin of the disc 25.
Screwed into the lower end of the body I there
is a tubular gland 28 whose lower end has the
external, annular ?ange 29. Beneath said gland
2,134,796
2
there is a tubular expander 30 whose upper end
has an external, annular ?ange 3I and whose
lower end has the external downwardly tapering
face 32. Between the ?anges 29, 3I there is an
antifriction bearing assembly 33 which is sur
rounded and enclosed by the circular housing 34.
Upper and lower retaining rings 35, 36 are se
cured to the inside of the housing 34 at the
upper and lower ends thereof, respectively, and
10 which embrace the ?anges 29, 3| whereby the
to the body I and to said cutters and as the cut
ters are gradually forced outwardly by the down
ward pressure against the actuators 1 they will
expander 30 is supported and allowed to swivel
relatively to the body I.
There is a tubular mandrel 31 to the lower end
of which is attached a tubular guide 38. This
15 guide has the yieldably mounted, outwardly ex
tended, frictional gripping members 39 mounted
therein adapted to grip the pipe 40 to be cut as
illustrated in Figure 4.
Secured to the upper end of the guide 38 are
20 the upstanding ?exible arms 4| whose upper
ends carry the pipe engaging slips 42. The outer
surfaces of these slips are preferably toothed as
shown and their inner surfaces are upwardly and
outwardly tapered to be engaged by the down—
25 wardly tapering face 32 of the expander 30, when
the expander is lowered, whereby the jaws 42
will be forced into secure gripping relation with
the pipe 40 as shown in Figure 5 to support the
cutting tool while the tool is operating. The
30 upper end of the mandrel 31 has an external,
annular ?ange 43 thereon adapted to engage the
upper end of the gland 28 when the mandrel is
in its lower position, as shown in Figure ,2. The
body I has an inside key 44 whose lower end rests
against the upper end of the ?ange 43, when the
tool is in inoperative position so that while going
into the well the mandrel 31 cannot move up
wardly relative to the body to expand the grip
ping jaws 42. The ?ange 43 has an external key
way 45 adapted to receive the key 44 when in
40
alignment therewith whereby the mandrel 31 is
permitted to move upwardly, as hereinafter ex
plained, so as to locate the ?ange 43 above the
key 44.
The tool is assembled as shown in Figure 1 and
45
2 and the chamber I2, which extends from the
lower end of the gland 5 to the shoulder 2 is ?lled
with oil or other suitable liquid. The mandrel 31
is turned to position to carry the keyway 45 out
of alignment with the key 44 with the ?ange 43
50 located beneath said key. As so assembled the
tool is let down into the pipe to be out. While
being lowered the gripping members 39 will fric
tionally engage the inside wall of the pipe 40.
55
When it is desired to make a cut the operating
string I6 may be turned to the right and when the
key 44 aligns with the keyway 45 the body I will
move downwardly, said key passing through said
keyway and the expander 30 wedging in between
and expanding the slips 42 into secure engage60
ment with the pipe as shown in Figure 5. The
tool will thereby be anchored and supported in
the pipe to be cut. While locating the tool in
the pipe the piston I3 will be at the upper end of
the chamber_I2. The operating string I6 may
65
now be allowed to move downwardly, gradually
and the pressure of the liquid beneath‘ the piston
I3 will react against the upper end of the cutter
actuator 1, forcing the same downwardly and
70 compressing the spring 9 thus feeding the cutters
II through the guide ways 4 andinto contact
with the pipe to be out. The operating string is
in the meantime rotated and the stem I4, having
a splined connection 46, with the gland 5, a rota
75 tion of the operating string will be imparted also
gradually cut into the pipe until it is severed.
Screwed on to the stem I4 there is a nut 41
which is adjustable thereon and which may be
locked in any desired position by the lock nut 48.
When the out has been completed, the lock nut
48 will land on an antifriction washer 49 on the
upper end of the gland 5 to limit the downward
movement of the piston I3 and the outward
movement of the cutters I I.
While the cut is being made the piston I3 will
gradually move downwardly increasing the pres
sure of the ?uid beneath it in the chamber I2 15
and this pressure will react against the actuator
1 to feed the cutters to the work as above stated
and said liquid will gradually leak through the
channel 20 to allow this downward movement of
the piston. Should the cutters encounter an ob 20
struction in the pipe being cut, or unusually hard
material to arrest the downward movement of the
actuator the disc 25 will land on the upper end of
the actuator and the disc will be expanded, or
partly ?attened out so as to carry the valve 21 25
across the lower end of the channel 20 to block
said channel to prevent the further downward
movement of the piston I3.
There will be less
pressure of liquid against the actuator than there
is against the lower end of the piston I3 for the 30
reason that the piston has the greater area ex
posed to the pressure so that when the channel
20 is closed by the valve 21 the cutters will not be
actuated further outwardly until they have had
the opportunity to cut away the obstruction or 35
hard material encountered by them whereupon,
as the obstruction is relieved, the pressure in the
chamber I2 beneath the piston will resume grad
ually feeding the cutters outwardly to the work.
As said actuator moves on downwardly the disc 40
25 will resume its original shape and withdraw
the valve 21 from obstructing position thus leav
ing the channel 20 open and the cutting operation
will continue as before.
The feed of the cutters
to the work will be thus automatically controlled. 45
Upon upward movement of the piston in the cy
lindrical chamber I2 the valve 24 will open and.
permit the liquid above said piston to quickly pass
through the channel 22 into the chamber I2 be
neath said piston and thereupon the valve 24 will 50
again close.
The drawings and description disclose what is
now considered to be a preferred form of the in
vention by way of illustration only, while the
broad principle of the invention will be de?ned 55
by the appended claims.
What I claim is:
1. A pipe cutter shaped to enter a pipe and
comprising a cutter body formed with a chamber
therein and having a cutter guide therethrough, 60
means for anchoring the body to said pipe, a
cutter actuator in the body, a cutter working
through the guide and connected to the actuator,
liquid in the chamber to the pressure of which one
end of the actuator is exposed, an operating 65
string terminating in a piston in the chamber
adapted, upon downward movement, to subject
said liquid to pressure and means normally tend
ing to hold the cutter retracted.
2. A pipe cutter comprising a cutter body 70
shaped to enter a pipe in a well and having a
chamber therein and a cutter guide through the
wall of the body, means for anchoring the body to
the pipe, liquid in the chamber, a cutter actuator
in the body exposed to the liquid, a cutter work
75
2,134,796
3
ing through the guide and connected to the actu
anchoring the body to the pipe to be cut, liquid
ator, an operating string, a piston in the cham- ‘
the chamber, a cutter actuator, a cutter ar
ber connected to the string and arranged to apply in
ranged to be moved outwardly by the guide into»
pressure to the liquid, upon downward movement
of the string to move the actuator downwardly
and to thereby actuate the cutter outwardly into
cutting relation with the pipe and a yieldable
member acting against the actuator to retract the
cutter upon relief of said pressure.
3. A pipe cutter comprising a cutter body
shaped to enter a pipe in a well and having a
chamber therein and a cutter guide through the
wall of the body, means for anchoring the body
to the pipe, liquid in the chamber, a cutter actu
ator in the body exposed to the liquid, a cutter
working through the guide and connected to the
actuator, an operating string, a piston in the
chamber connected to the string and arranged to
apply pressure to the liquid, upon downward
20 movement of the string, to move the actuator
downwardly and to thereby actuate the cutter
outwardly into cutting relation with the pipe and
a yieldable member acting against the actuator
to retract the cutter upon relief of said pres
25 sure, and means for automatically regulating the
pressure against the actuator.
'
4. A pipe cutter adapted to cut by rotation and
comprising a cutter body shaped to enter a pipe
in a well and having a chamber therein and a
30
cutter guideway therethrough, liquid in the
chamber, means for anchoring the body to the
pipe, a cutter actuator in the body exposed to
the liquid in the chamber, a cutter connected to
the actuator and working through said guideway,
35 a piston in the chamber effective upon downward
movement to apply pressure to the liquid, said
piston having liquid passageways therethrough, a
downwardly opening valve controlling one of said
passageways, an operating string having a slid
40 able but non-rotatable connection with the body
and connected to the piston, means arranged to
close the other passageway upon a predetermined
pressure of said liquid and means for retracting
the cutter upon relief of said pressure.
5. A pipe cutting tool adapted to cut by rota
45
tion and comprising a cutter body shaped to enter
the pipe to be cut, means for anchoring the tool
to the pipe, cutting means in the body, means
normally holding the cutting means inactive or
retracted, mechanical means for feeding the cut
ting means to the work and hydraulically con
trolled means for automatically controlling the
feed of the cutting means.
‘
6. A pipe cutter comprising a cutter body
55 shaped to enter a pipe in a well and having a
chamber therein and a cutter guide, means for
cutting relation with the pipe to be cut, an oper
ating string, a piston in the chamber arranged to
be moved downwardly upon downward movement
of the string to apply pressure to the liquid to
control the feed of the cutter and a yieldable
member acting against the actuator to retract the
cutter upon relief of said pressure.
7. A pipe cutter adapted to cut by rotation and
comprising a cutter body shaped to enter a pipe
10
in a well and having a chamber therein and a
cutter guide, liquid in the chamber, means for
anchoring the body to the pipe, a cutter actuator 15
associated with the body, a cutter connected to
the actuator and working against said guide, a
vpiston in the chamber effective upon downward
movement to apply pressure to the liquid and to
actuate the cutter, said piston having liquid pas 20
sageways therethrough, a downwardly opening
valve controlling one of said passageways, an op
erating string having a slidable but non-rotatable
connection with the body and connected to the
piston, means arranged to close the other pas 25
sageway upon a predetermined pressure of said
liquid and means for retracting the cutter upon
relief of said pressure.
8. A pipe cutting tool adapted to cut by rota
tion and comprising a cutter body shaped to 30
enter the pipe to be cut, means for anchoring the
tool to the pipe against downward movement, cut
ting means on the body, means normally holding
the cutting means inactive or retracted, mechani
cal means for feeding the cutting means to the
work, hydraulically controlled means for con
trolling the feed of the cutting means, said hy
draulically controlled means including a con?ned
body of liquid, a piston operable against the liq
uid and having a by-pass whereby a retarded
movement of the piston will be effected.
9. A pipe cutting tool adapted to cut by rota
tion and comprising a cutter body shaped to enter
the pipe to be cut, means for anchoring the tool
to the pipe against downward movement, cutting
means, means normally holding the cutting means 45
retracted, means for moving the cutting means
downwardly, means for moving the cutting means
outwardly, upon such downward movement, into
active position in cutting relation with the pipe
to be severed, a cylinder, liquid in the cylinder,
a piston operable against the liquid in the cylin
der for automatically controlling the feed of the
cutting means to the work.
FRED N. OSMUN.
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