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Патент USA US2122717

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> July 5, 1938-
s. M. GREENIDGE ,
2,122,717
PROTECTOR FOR PISTONS AND THE LIKE
Filed Sept. 24, 1935
2 Sheets-Sheet l
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Greene 3e
July 5, 1938-
s. M. GREENIDGIE
2,122,717
PROTECTOR FOR PISTONS AND THE LIKE
Filed Sept. 24, 1935
2 Sheets-Sheet 2
7/14
1159311
areeiziz‘degev
Patented July 5, 1938
2,122,717
UNITED‘ STATES
PATENT OFFICE
2,122,717
PROTECTOR FOR PISTONS AND THE LIKE
Samuel M. Greenidge, Fort Worth, Tex.
Application September 24, 1935, Serial No. 41,946
9 Claims. (Cl. 29-882)
This invention relates to protectors for pistons,
piston rings and the like, and is especially adapt
ed for use with deep well pumps, regardless of the
?uid to be pumped.
~5
One of the primary objects of the invention
consists in providing a protector for the piston
when initially being lowered from the surface to
the pump cylinder and in certain instances when
being withdrawn therefrom.
in‘)
Another object of the invention resides in the
provision of means for facilitating the installa
tion of the protector over the piston, and for prop
15
The piston employed to disclose the present em
bodiment of the invention includes ?bre pack- 10
ings or cups indicated by the numeral 3 and a
metallic cup 4. These elements are mounted on
the piston in any conventional manner and are
of the protector.
A further object of the invention consists in the
provision of means for releasably holding the
secured in place by lock nuts 5. Also mounted
on the piston, at the upper end thereof, is a ring 15
or washer 6, shown in detail in Figure 5. This
protector in position until the piston reaches the
ring is provided with external screw threads 1;
cylinder.
-
A still further object of the invention resides
in the provision of means in certain instances for
properly positioning the protector on the piston
when the latter is being withdrawn from the well.
Other objects and advantages of the inven
25 tion will be apparent from the following descrip
tion when taken in connection with the accom
panying drawings, in which,
Figure 1 is a side elevational view of a pis
ton and packings, and showing the protector
130 spaced above the packing rings and ready to be
drawn downwardly into position.
Figure 2 is a side elevational view of a tool
for aligning the packing'rings and for drawing
the protector into position.
:35
paclnng rings.
erly aligning the packings prior to the application
bottom of the well and is about to enter the pump
20
adjacent its lower end with a piston, indicated
generally by the numeral 2. The piston here
shown is provided with the usual packing ele
ments, but the term piston used throughout the
speci?cation and claims is intended to include 5
any element adapted to cooperate with a pump
cylinder regardless of the presence or absence of
Figure 3 is a side elevational View showing the
tool connected to the protector.
Figure 4 is a side elevational view showing the
protector in position and the tool removed.
Figure\5 is a plan View of one means for releas
40 ably holding the protector in its operative posi
tion.
Figure 6 is a fragmentary View of the protector,
shown partly in section.
Figure 7 is an elevational view, partly in sec
’45 tion, showing the position assumed by the pro
tector when the piston reaches the pump cylinder.
Figures 8, 9 and 10 are sectional views showing
modi?ed forms of mechanisms for releasably
locking the protector in position until it reaches
'50 the pump cylinder, and
Figure 11 is a fragmentary elevational view of a
modi?ed form of protector.
Referring to the drawings in more detail, and
especially to Figures 1 to 7, inclusive, the numeral
55 l indicates the piston rod of a pump, provided
and an internal tongue 8 or other preferred means
may be employed to prevent rotation of the ring.
In the operation of the device, as will appear 20
hereinafter, it may be desired that the ring 6 be
sheared oif, and in order to minimize the force
required in the shearing action, parts of the ring
may be removed as indicated by numeral 9.
The lower end of the piston is provided with a 25
slightly tapered steel band H} which serves not
only to guide the piston into the pump barrel or
cylinder but also to prevent undue bending of
the lower end of the protector when the latter
engages the pump cylinder as will later appear.
30
The protector sleeve or cylinder for the piston
is indicated by the numeral Ii and is shown in
Figure 1 in its initial position prior to being
drawn over the piston to the position shown in
Figure 4. The external diameter of this cylinder 35
is slightly greater than the internal diameter of
the pump cylinder l2 (Figure 'l) and the major
portion of its interior has a diameter substan
tially the same as the diameter of the piston and
the internal diameter of the working barrel I2.
40
The upper wall of the protector is thickened
somewhat to provide a shoulder is and to also
permit the formation of screw threads Hi. The
threads I4 are adapted to engage the threads ‘I
on the ring 6 when the protector is drawn down 45
to operative position and rotated, and the ring
thus serves to lock the protector in its proper
relation to the piston until the ring is sheared
oif or otherwise disconnected from the protector.
The shoulder I3 is adapted to be engaged by the 50
upper end of the piston when the latter is being
withdrawn and thus the protector will be with
drawn with the piston and will shield the piston
during its removal from the Well.
The lower end of the protector II may be pro- 55
2,122,717
vided with teeth l5 when it is intended to be re
leased from the locking ring 6 by rotation rather
than by shearing the ring. The teeth I 5 are
caused to bite into the upper end of the barrel I2
by the weight of the piston I and the protector
is thus held stationary while the rod l and ring
6 are being rotated.
The mechanism for properly aligning the piston
packings, for bringing the protector to its oper
10 ative position, and for attaching the protector
to the piston will now be described.
This mechanism or tool consists of a cylinder
20 having an internal diameter substantially
identical with the internal diameter of the work
15 ing barrel l2 and the protector H. The upper
end of the tool 28 is enlarged slightly as indi
cated at 2i and has an internal diameter sub
stantially the same as the external diameter of
the protector ii. This upper portion of the cy
20 lindrical tool is provided with a plurality of ver
tical slits 22 extending through the upper end
of the cylinder so as to form a plurality of re
silient gripping ?ngers. Surrounding the an
nular series of ?ngers are two clamping bands
25
39
23 provided with tightening bolts 24.
The num=
ber of bands as well as the number of ?ngers
may of course be varied as desired, it only be
ing necessary that the number be sufficient to
provide a tight grip on the protector. The lower
end of the cylinder is provided with a handle 25
end of the pump cylinder by reason of the weight
of the piston red I, hence rotary movement ap
plied to the rod causes the ring 6 to rotate with
respect to the protector and thus separates these
parts. The pressure applied to the lower end of
the protector when in engagement with the bev
eled upper end of the pump cylinder might bend
its wall inwardly thereby preventing passage of
the piston or damage thereto. The tapered steel
band ill is so located on the piston as to limit 10
any bending action of the lower 'end of the pro
tector and thus avoid the di?iculties mentioned.
The band I0 is also slightly tapered so as to fa
cilitate the entrance of the piston into the pump
cylinder.
15
During the time the piston is in the cylinder
[2 the protector l I will rest in the position shown
in Figure 7' and will in no way interfere with the
operation of the piston. When, for any rea
son, it is desired to bring the piston to the sur 20
face, the initial movement from the barrel l2
will cause the piston to engage the shoulder l3
on the interior of the protector adjacent the
upper end thereof, and the protector is thus po
sitioned so as to protect the piston and packings 25
during their upward movement through the well
casing.
'
In Figures 8, 9 and 10 are disclosed several
to facilitate operation of the cylinder to draw
modi?ed constructions for releasably locking the
protector to the piston while descending the well. 30
The construction ‘of Figure 8 comprises a plu
the protector into position as well as to rotate
it in making connection with the ring 6.
In the operation of the device as thus far de
rality of small screws 30 which are extending
radially through the upper end of the protector
3i and threaded into the upper end of the pis
35 scribed, the parts being in the positions indi
cated. in Figures 1 and. 2, the tool 20 is ?rst
forced upwardly into the position indicated in
Figure 3. In this movement of the tool the
packing rings are brought into correct align
40 ment and are contracted to a diameter exactly
that of the internal diameter of the protector
II. The bolts 25 are then tightened so as to
cause the integral ?ngers on the upper end of
the tool to tightly grip the lower end of the
protector and the protector is pulled downward
ly to the position indicated in Figure 4. The
cylinder 28 is then rotated on its axis by means
of the handle 25 so as to cause the internal
threads it of the protector to engage the ex
50 ternal threads 1 on the ring 6. When this op
eration of connecting the protector to the piston
is completed the clamping bands 23 are loosened
and the tool removed.
The piston, with the protector applied as in
dicated in Figure 4, is now ready for lowering
into the well. In descending the well the sleeve
II will serve to prevent contact of the piston or
its packings with the various joints of the well
casing or with foreign matter such as mill scale,
60 and will thus prevent damage to the piston such
as has been frequently caused heretofore as is
well known to those skilled in the art.
the piston ‘reaches the bottom of the well
the iower end of the protector II will engage the
65 upper end of the working barrel i2 as indicated
in Figure '7. The weight of the various sections
of the piston rod may be sufficient to shear the
ring ‘I and permit the piston to enter the bar
rel, if not, the piston may be raised slightly and
70 allowed to drop thereby providing the force nec
essary to disrupt the connection between the
ton. These screws of course will be sheared off 35
by the force applied to them when the lower
end of the protector is brought into engage
ment with the upper end of the pump cylinder.
In Figure 9, the protector 40 is provided with
an internal channel 4| in which are mounted 40
one or more springs 42. These springs are
bowed slightly as indicated and are intended to
seat in similarly shaped grooves formed in the
piston when the protectoris brought down to
operative position. This resilient connection be
45
tween the piston and protector will of course be
released when the protector engages the upper
end of pump cylinder l2.
7
In Figure 10 the releasable connection between
the piston and protector comprises a split ring
50. This ring is located in cooperating grooves
5| and 52 formed in the protector 53 and in the
piston. Excessive pressure applied to the lower
end of the protector, as when it engages the
working barrel, will cause a contraction of the
ring 50 and thereby permit the piston to pass ' 55
through the protector into the working barrel.
The protector shown in Figure 1i is formed of
sheet metal and is indicated by the numeral '80.
This form of protector is preferably ?uted or
grooved to provide ribs as indicated by numeral 6| ’ 60
so as to reinforce and strengthen the cylinder
against longitudinal compression and against col
lapse under strain. Also thegrooves provide
more space for the passage of para?in or other
material which may have adhered to the inner
surface of the tubing. Somewhat similar grooves
may be provided in the protectors of Figures 1 to
10, inclusive, if found desirable.
The protectors above'described are made of
durable metal and are intended to remain in the
piston and protector. Or, if desired, these parts
well and protect the piston when being with
may be disconnected by a rotative action. In
this operation the teeth E5 on the tower end of
the protector arecaused to bite into the upper
drawn from the well as heretobefore mentioned.
However, it may be desirable in some instances
to form the protector cylinder of some material
3
2,122,717
which is soluble in the fluid to be pumped, and
which will automatically dissolve shortly after
reaching the bottom of the well. It will be under
stood therefore that where it is not essential
to provide a protector when withdrawing the
piston the cylinders heretofore described may be
formed of any preferred soluble material.
From the foregoing description and the at
tached drawings it Will be apparent to those
skilled in the art that I have devised an exceed
ingly simple and inexpensive means for avoiding
damage to pistons and their packings; that the
protecting means is readily applied in position
and may be automatically released at the desired
15 time; that means are provided for properly align
ing the piston packings before the protector is
brought into position; that the protector itself
serves to retain the packings in such position;
and that the protector is so designed as to re
sume its protective position as the piston is with
drawn from the pump cylinder.
In accordance with the patent statutes I have
described what I now believe to be the preferred
embodiment of the invention, but inasmuch as
25 various minor changes may be made in the details
of construction without departing from the spirit
of the invention, it is intended that all such
changes be included within the scope of the ap
pended claims.
What I claim is:
1. In a pump, a piston, a pump cylinder, a
protector sleeve for said piston having an external
diameter slightly greater than the internal di
ameter of the cylinder, and a frangible element
35 forming a connection between the piston and
protector.
2. In a pump, a piston, a pump cylinder, a
protector sleeve for said piston having an external
diameter slightly greater than the internal di~
ameter of the cylinder, and a frangible ring con
necting said piston and protector.
3. ‘In a pump, a piston, a pump cylinder, a
protector sleeve for said piston having an external
diameter slightly greater than the internal di
45 ameter of the cylinder, and a frangible ring
mounted on the piston and threadedly engaged
with the protector.
v
4. In a pump, a piston, a pump cylinder, a pro
tector sleeve for said piston provided with teeth
50 on its lower edge adapted to engage the upper
edge of the pump cylinder, the external diameter
of the protector being slightly greater than the
internal diameter of the cylinder, and a screw
threaded connection between the piston and pro
tector, whereby engagement of the teeth with
the cylinder will facilitate unscrewing the pro
tector.
.
5. In a pump, a pump cylinder, a piston, a
washer adjacent the lower end of the piston and
having an external diameter slightly less than
the internal diameter of the cylinder, a protector
sleeve encircling the piston and having its lower
end encircling the washer, whereby undue crush 10
ing of the end of the sleeve is prevented and a
releasable connection between the piston and
protector.
6. In a pump, a piston, a pump cylinder, a
protector sleeve for said piston, said protector 15
having a greater external diameter than the in
ternal diameter of the cylinder, the upper wall of
said protector being thickened to provide a shoul
der, screw threads formed in the thickened wall
portion and a frangible ring connected to the pis 20
ton and threaded to the thickened portion of the
protector.
7. In a pump, a piston, a pump cylinder, a
protector sleeve for said piston, said protector
having a greater external diameter than the in 25
ternal diameter of the cylinder, the upper wall
of said protector being thickened to provide a
shoulder, screw threads formed in the thickened
wall portion, teeth formed on the lower edge of
the protector adapted to engage the upper edge 30
of the pump cylinder, and a frangible ring con
nected to the piston and threaded to the thickened
portion of the protector, whereby engagement of
the teeth with the cylinder will facilitate un
screwing the protector.
35
8. In a pump, a piston, a protector for the pis
ton, the piston and protector provided with 00
operating grooves, and a split ring located in
said grooves for releasably locking the piston and
protector together.
9. In a deep» well pump, a piston and piston
rod, a pump cylinder, a protector for covering said
piston, positive means for releasably locking the
protector in its operative position with respect to
the piston, said protector having an external 45
diameter greater than the internal diameter of
the pump cylinder, so that the protector will en
gage the upper end of the pump cylinder, the
piston rod being of such weight as to cause the
protector to forcefully engage the upper end of
the pump cylinder, whereby the locking means
may be released.
SAMUEL M. GREENIDGE.
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