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Патент USA US2137403

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Nov. 22, 1938.
D. vv. HOF‘ÉRER
2,137,403
PUMP
Filed March 10, 1937
40
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Nov. 22, 1938„
2,137,403
D. W. HOFER ER
PUMP
Filed March 10, 1937
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2 Sheets-Sheet 2
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Patented Nov. 22, 1938Y
2,137,403
UNITED STATES eATENTfoI-"Fica
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2,137,403
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PUMP`
,
.
Daniel W. Hoferer, LongBeach, Calif.
Application March 1o, 1937, seria1No..13o,o63
In;
g
.
15 claims. (orma-i731
»
*This invention relates to pumps and relates
more` particularly to Well pumps such as oil well
pumps. A general object of this invention is to
provide a practical, efficient well pump embody
ing novel and effective means for preventing or`
Ü
reducing shock to the relatively movable parts.
In my co-pending application entitled Well
pump, Serial No. 130,062, filed March 10, `19?»7,
` I have described and claimed a free barrel well
wt; pump embodying a free or movable barrel and
two plungers extending into the barrel, one
plunger being stationary, the other plunger being
movable. Stop‘parts are provided on the barrel
and plungers to limit‘relative movement between
>15u them and to prevent disassociation of the pump
parts when `the pump is run into and `removed
from the well. It is desirable to cushion or elimi
nate the‘shock to the barrel and plungers and’
`
`the parts connected therewith when the stop
20l parts come into contact during operation of the
pump.
‘
»
i
`
.
~
I
` It is another object of this invention to provide
a well pump of the free barrel type referred to
above embodying cushioning means for material-l
25 ly reducing or eliminating the shock and jar that
might otherwise result from the contact of the
stop partsof the barrel and plungers.
Another object of this invention is `to provide
barrel in cross section. Fig. 2 is a view similar
to Fig. l showing> the upper portion of the pump.
Fig. 3 is an enlarged, longitudinal detailed seo
tional view of I a portion of the pump showing
certain ofthe .plungerparts in elevation and il
lustrating the cushioning means at the upper
portion of the pump. Fig. 4 is an enlarged
fragmentary vertical sectional viewof the lower
portion of the pump showing parts of the lower
vplunger in elevation and illustrating the cush
ioning meansfof the lower portion of the pump.
Fig. 5 is a transverse detailed sectional view
taken as indicated by line 5--5 of Fig. 4. Fig. 6
is an enlarged fragmentary Vertical sectional
view illustrating thevalve on the movable plung
er. Fig. '7 is a fragmentary` vertical detailed sec~
tional View illustrating the valve on the standing
plunger, and Fig. 8 is a. diagrammatic longitudi
nal sectional view showing theplungers in ele
vation and illustrating the barrel and the mov
able plungerl at the lower ends of their strokes.
AThe well pump `provided by this invention in
cludes, generally, a free barrel I0, a standing
plunger I.I` entering the lower end of the barrel
and carrying a valve I2, a working plunger I3
entering the upper .end of the barrel I0 and car
ryinga valve I4, cushioning means I5 for pre
5 I
10y
15
20v
25
venting shock to ‘the barrel and plungers when
a well pump of the character referred to in which- certain parts >of" the same move together to limit
the cushioning means are hydraulic, employing the relative >movement and cushioning means Iii 30
for preventing shock to the barrel I0 and plung
the liquid around the pump as the shock absorb
ers Il` and I3 when parts thereon move together
ing or movement resisting medium.
¿
I
Another object of this invention is toprovide to limit relative movement between the barrel
. a pump of the character referred to in which` the
cushioning means are simple and sturdy, embody
. ing a minimum number of parts and connections.
`. Another object> of this invention is toprovide
a Well pump of the character referred to in,
. which the cushioning means may be easily modi
mi‘ìiied to suit various conditions of operation, the
speciñc gravity of the liquid handled, etc.
A further object of this invention is to provide
an improved well pump of the character referred
to in which the cushioning >means are small and
45xZ inexpensive and do` not materially add to the cost
and plungerSf. ~
I
l
»The barrel I0 isv an elongate, tubular struc 35
tureA or member. In the pump illustrated the
barrel ID is of uniform diameter throughout its
length-and is a simple tube of considerable length.
The opposite ends of the barrel Ill are provided
withfiittings or parts that I will term puller nuts 40
Il.` The puller nuts ‘I1 may be alike and-may be
threaded into the ends Yof the barrel IIJ. >If de
sired one of the puller‘nuts Il may be an integral
part ofthe barrel I0. Therpuller nuts `I‘l are
preferably shouldered to bear against the ends
of the barrel I0 when threaded in place. ` The
of the pump. ‘
puller nuts Il on the ends of the barrel I0 serve
The various objects and features of my inven
tion will be fully understood from the following as bearings or guides for the plungers II and I3
detailed description of a typical, preferreduform and perform other functions as will be herein
.
50` and application of the invention, throughout after described.
50
The standing plunger I‘I is the » stationary
which Vdescriptionreference is made to the ac
companying drawings, -in which:
`
l
Fig. 1 is a longitudinal detailed sectional view
of the lower portion of the pump provided by
„this invention illustrating the tubing and` the
,member of the pump and is adapted to Vbe an- ,
chored in a well tubing T. The plunger II is an
elongate tubular member extending into the low
er endof the free barrel IU. In they construction 55
2
2,137,403
illustrated the plunger II comprises a lower tube
and type and may be positioned on the standing
plunger |I as found most practical. In the form
of the invention illustrated the valve I2 is in the
I8 extending through the lower puller nut I1
and an upper tube I 9 extending longitudinally in
the barrel I 0. The two plunger tubes I8 and I9
nature of a ball valve comprising a cage 36 se
cured to the upper end of the upper plunger
member I9,-a seat 3l in the cage 36 and a ball
may be connected by a coupling 20 threaded to
their adjacent ends.
The plunger tube I8 may
pass through the lower puller nut I‘I with suit
38 for cooperating with the seat 3l’. The cage 3E
is perforated or ported to have communication
relationship between the tube I8 and the lower with the interior of the barrel i8. A web 39: may
be provided at the upper end of the cage 35 to
puller nut I1 will be more fully described in con
nection with the cushioning means |5„and I6.
limit upward travel of the ball 38 in the cage.
Anchor means is provided to releasably hold or The ball 38 is adapted to seat downwardly against
anchor the standing plunger || in the tubing T. the seat 3l to control communication between the
In the particular case illustrated the. plunger tube 'interior of the tubular standing plunger II and
I8 is provided with a nut part or enlargement 2| ‘ the interior of the free barrel IIl. The assembly 15
which is threaded on the upper end of an anchor . of the spaced sets oil packing rings 35 and the
mandrel 22. The enlargement 2|"on'the" lower spacing collars 3| may be clamped between the
end of the plunger tube I8 isy preferably integral . valve cage 36 `and the coupling 20 of the plunger
with the tube. The anchor mandrel V22 extends II.
20 into a shoe 23 secured to the lower erìd of' the
The plunger I3 is adapted to be operated by 20
tubing 'I'.l The shoe 23. is provided with an intera a sucker rod or pump rod 40 and is the reciprocat
nal ilange 24 andthemandrelg22 :is provided ingplunger element of the pump. The plungerv
with an externalannular 'flange v25 which is re'
I3 isA an elongate tubular member or assembly
able tolerance or clearance, as illustrated.
'I'his
leasably latched underl the »ilan_ge.24. The man-`
25 may be latchedunder the .flange 24 and may
and .may include an upper tube 4| extending
through the upper puller nut I 'I and a lower tube 25
42 vwithin'the barrel I0. The adjacent ends of
be freed from the-,flange 24.Y An inclined seat 26
the plunger tubes 4I and 42 may be connected by
is provided on the upper end_of the shoe 23. A
sealing member 21 of copper or the like` sur
an, integral coupling 43. The upper end of the
upper plunger tube 4I is connected with the lower
rounds the mandrel 22'to cooperatewith the _seat
26. `The sealing member 21 is clamped between
end of the rod 49.
a shoulder 28 and a threaded >nut 29 on the man
ported coupling 44 is threaded on the lower end
of the rod 45 and a tubular member 45 is provided
on the upper end ofthe tube 4I and is threaded
25 drel 22 is longitudinallyV splitiso that its flange
The rod 4G may be solid or
nontubular. . In the arrangement illustrated a
drel 22. Themember Zlis shaped to tightly seal
against the seat 26..,> Withthe parts related as
‘j illustrated in Fig. 4 the enlargement 2| of the
plunger tube I8 clamps against the nut 29 to serve
into the coupling 44. The ported coupling 44
places the interior ofthe reciprocating plunger I3
as a lock nut. „Theishoe 23 and the mandrel 22
are tubular so that the lower end ofthe stand
in communication with the tubing T. The mem
ber 45 may be integral with the plunger tube 4I
ing plunger I I is inA communication with the well.
or may be threaded on the tube 4|,.as illustrated.
It will be observed thatthe upper puller nut VI 405
and the member 45 may cooperate to limit move
44h, The anchor- mandrelí 22 releasably` held in the
shoe 23,; aswdescribed above, serves to, rigidly
support the standing plunger II in a vertical po
sition.
'
~
' The plunger I I'Iisprovided with packing means,
` for sealing with the interior of theV barrel III.
In practice any suitableform. of packing means
may be provided. ._ In. 'the structure> illustrated
vertically spaced sets orseries of packing rings 30
are provided on the plunger tube I9 to have seal
ment between the reciprocating -plunger I3 and
the barrel I0 and thus constitute stop parts on
the plunger and barrel. Cooperating clutch parts
are preferably provided on the member 45 and the
upper puller nut I'I to connect the plunger I3 and
the barrel I0 against rotation when it is desired
to tighten the threaded joints of the pump rod 40.
In the simple construction illustrated spaced
45 l'
ing engagement withthe inner wall yof the barrel
' IIE.> lThe sets of packing rings v3|Iare spaced apart
and are spaced from .the coupling 2U and the
partsat the upper end ofthe plunger II .byspac
clutch lugs 46 are provided on the member 45 and 50
spaced notches 4`I are provided in the- upper end
of the upper puller nut I“Ifto receive the lugs 46
to connect the plunger I3 and the barrel I0
ing collars 3 I.
552 tain circumstances the lowerend of the lower
against relative turning. The plunger I3 is pro~
vided with packing means for slidably sealing 55
the enlargement 2| on the tube` I8 to limit the
downward travel of Vthe free barrel I0. VvThus the
lower puller nut I1 and the enlargement 2| serve
60 as stop parts to limit movement between the bar
rel IIl and the plunger II. iny one direction.
with the interior of the barrel I0. In the con
struction illustrated this packing means includes
two vertically spaced groups or sets of packing
rings 48 on the plungerv tube 42 slidably engaging
the interior of the barrel ,I Il.. The groups of rings 60.
48 are spaced apart and are spaced from the cou
It will be observed that >under cer~
puller nut Ilmay engage downwardly against
'
Clutch means are preferably provided on the Y pling 43 and the Vvalve I4 on the inner end of the
lower puller nut I ‘land the enlargement 2| to . plunger> I3 by spacing collars 49.
connect the lower end of the barrel> I0 with the
„plunger II and anchor mandrel 22 to hold the
barrel >III against turning when it is desired to
tighten the threaded connections in the pump
rod. In the simple arrangement illustrated the
clutch means comprise spaced notches34 in the
lower end of the puller nut I‘I and clutch lugs 35
on the enlargement 2| for cooperating with the
l
notches.
‘
f
>The valve I2r is the standing valve of the pump
and in accordance with the broaderraspects of
75. .
the invention maybe of any-suitable construction
The valve I4 is the working valve and controls
communication between the pump chamber in 65
the barrel I0 and the tubing T. The valve I4
may be of any suitable type and may be located
as found most desirable. Intheform of the in
vention illustrated the valve I4 »is a simple ball
type valve provided on the -inner end of the 70.
plunger I3. The valve I4, illustrated in the draw
ings, includes a tubular cage 50 threaded on the
lower end of the plunger tube 42. A tubular inlet
fitting 5| is threaded on the lower end of the
cage 50. A seat 52 is clamped between the- upper 75
3
2,137,403
_ of the coupling 43 `and the interior. of the barrelà
of packing rings 48 and the spacing'collars 49.
the barrel IIB furtherincludes controlled ports
may be `clamped between the coupling 43 yand
51 for the escape .of the fluid trapped'rin the
space 56. In theiorm oi?.` the 4invention `>illus-Y
trated there are a multiplicity of -longitudinally
spacedports 51 in the wall of` `‘thebarrel I_ilnto
communicate with the spacey56and to `bacon?
the valve
»
depending upouithe` specific gravity of. the. li-luid4
end of. the. iitting 5I anda shoulder 53‘in.v the>
cage 50. .Thelball 54 is. operable to cooperatezwith.
the seat 52‘to govern. communication between the;
interior of the barrel I0 and theinterior` ofthe
reciprocating plunger `VI3. A pin `55 »extends
through the cage 56" to limit upward movement
ofthe ba1l.54. The-.assembly of the spaced sets
cage 56.
`
.
.
.1
.
l
J One of the cushioning‘means` I5 -is provided .to
reduce or eliminate shock to the pumpparts when
‘ ‘upward movement between the. plunger I3- and
thebarrel> Ill is stopped and when downward
15’ movement of the` barrel Ill] relative to the plunger
I3 is stopped. The otherxcushioningcmeans I5 is
provided to reduce or eliminate `shock to the
pump parts when upward movement of the barrel
I0 relative to thefplungerJI ` iswstopped.` The.
20* cushioning means I5 herev shown are hydraulic
means, it being understood that thev invention
may be carried outwith spring cushioning means,
handled and other factors.` For-similar reasons
the tolerance, or. clearance between >the.` periphery
I0 ‘may be‘variedttoxsuit the4 conditions of _op--l
eration.
The cushioning4 means; I5 .at the :upper vend lof A
105
trolled by a parton the plunger _I3.Q_ The ports:
5l
are
shown
arranged in . circumferentially.
spaced rows extending longitudinally of-¿tlie_¿.bar->V`
rel II) to be controlled by the coupling 43 ,ofthe
plunger I3. It will be apparent howpthe lengt-._V
tudinally spaced ports 51 are` successively cut; off"
by thecouplin‘g 43 when the coupling ¿Itand the
puller nut I 'I moveA toward> one another-` .The
ports l571 ofthe spaced vertical rows preferably
occur .in‘ different vertical planes to besucces-y
drauliccushioning` means I5 are advantageous as ' sively closed or cut oiî _by the coupling 43. AFur
25 they maybe incorporatedin the pump at little ther, it may begpreferred to design theymeans I5
`expense,.may `be regulated or varied to adapt the ‘ sotthat the spacing and/or the areas of» the ports.
pump for use under .various operating conditions 5l provide.aprogressively increasing pressure in»
and are very effective. The two cushioning means
the space 56 and,` therefore, a progressively in;
bumpers, or cushioning materiaL-etc. The hy
I5 are provided at or adjacent theÍopposite ends
30.2 ofthe free barrel I0 andmay be `alike or‘very
‘
similar.
creasing cushioning action. This may be, accomf
plished by graduating' the> diameter or capacity of 30x.
the ports 5'! making the‘ports :nearest -thepuller`
.
In Fig. s of the drawings I have illustrated in
nut |11 of the smallestv diameter and/ortbyjvary-f
ing the spacingV of the ports.` The invention con
detail the cushioning meansIE at the upper end
of the barrel I0» `for reducing the rate of move . templates the making ofthe ports-5lI .of selected
capacity to provide ffor the proper operation ofA
s. ment between the barrel and the plunger I3 when
the upward movement of the plunger relative to
the barrel is about to be stopped andwhen the
the ‘means `I5 under different operating condi
downward movement. of theyb'arrel relative to
From the above it will be seen, that thefcushì-‘ä
inning means` I5 at-the upper end of the barrel.,
Ill provides a uniform capacity escape ‘ci fluid
. the plunger I3 is about to be stopped. The inner
4o en‘c'l of the upper puller. nut IT and the upper end
tions.
.
‘
1g,
`
r
from the" space 56 `through theclearance between
the interior‘of the upper puller nut I'I' andwthe
‘ off» the coupling 43 `are adapted to cooperate to.`
limit `the upward `movement . of `the plunger. I3
relative to the‘barrel I0 and` to limit downward
plunger tube 4I, a similar constant capacity ese..`
movement of the barrel onthe> plunger I3. The
cape through the tolerance between‘the` coupling i
hydraulic cushioning means I5 at the uppergend
‘ of the barrel I0. utilizes 'or includes the annular
fluidspace 56 in the‘barrel I6 between the op
posing ends of the upper puller nut Il and the..4
coupling 43. The volume orY the‘capacity ofßthis
50. fluid space 56 is, of course,.reduced when there
is relative movement between 4the barrel I0 and
the plunger I3 to cause the‘opposing ’ends of
the puller nut `I'I and the` coupling 43 `to move
toward one another.
The‘means I5 utilizes the
55" iiuid trapped in the space 56 to control the `rate
of this relative movement and thus cushion the
shock that would otherwise result from the con
tact between the inner end of the puller nut Il
‘ 602:
and the upper end of the coupling 43.
i
The means »l5 provides for the controlled es
cape of the trapped i'luid from the space 56. The
tolerance or clearance between the plunger tube
4'I and the interior of the tubular puller nut I'I'
may constitute a means of escape for the trapped
fluid in the space 56' that is substantially con
stant or of uniform capacity throughout the op
eration of the cushioning means I5.
Further,
the clearance or working tolerance` between the
periphery of thecoupling 43 and the interior of
the barrel I0' may constitute another substan~
tially constant path of escape for the iiuid
trapped in the space 56. In accordance withthe
invention the tolerance or clearance space be
tween the interior of the tubular puller. nut I'I
'up and the plunger tube. 4I. may be .small or great
43 andthe interior of the barrel` III, anda gradually >decreasing.escapel through the ports 5l. . Alin .
this connection it is to bey understoodçthatfthere .
may be a clearance space of any reasonableßcaff
pacity between'the coupling'43 and the interior`
ci the barrel II) and that‘this space may be prof`> 50c.
videdby reducing the diameterfof the Aupperpor.
tion of .the coupling. 43 orÍ by reducing, the-exa>`
termal diameter of `>the entire coupling.w..The
ñuid .from the space 56 that ‘_escapeslbetween
the coupling 43» and the wallfof the `barrel il] 551
passes- out through the ports 51. into the tubing
'I' and does not reach or pass-the packing
4i! oi' the plunger I3,
C
` 5 .
„
A .
When the inner end of the upper puller nut I 'I
` and the upper end of the coupling 43 `approach
one.. another either due to movement ci'. thev
plunger I3 relative to the barrel III, or movement
of the barrel Il) relative to the plunger I3, `or theL
combined relativemovement of the plunger :andi
barrel, the space >56 is, of course, reduoedin ca-4
pacity and the fluid trapped `therein isputunden
an increased .pressure and displaced. ‘Theïine
crease in pressure on the fluidin the space-‘.516 is>
accompanied by increased resistance to relative’
movement between the barrel I0 and the plunger 720 i'
I3, this resistance being offered by the trapped
fluid. As the relative movement progresses the
ñuid in the space 56 offers gradually increasing
resistance tothe movement. .This results `from
the progressive; cutting _oir of the ports 5'I- by» the'
`
4
2,137,403V
coupling 43 and the upwardly diminishing fluid
means I5 described above. When the barrel IIl
capacity of the ports 51 that remain open to the approaches the upper end of its upward move
space 56. Thus the movement is gradually cush
ment relative to the plunger II the upper end
ioned or retarded until the inner end of the nut . of the puller nut I1 moves toward the lower end
5:2 I1 and the upper end of the coupling 43 come of the coupling 20. The ñuid trapped in the
into close proximity, at which time a maximum space 56a resists the movement of the barrely IU
pressure exists in the space 56 due to the fact relative to the plunger || and this fluid is forced
that all or practically all of the ports 51 are cut to escape from the relatively restricted ports 51a
ofi' and the fluid in the space is obliged to rescape and the clearances between the interior of the
l0`> from the tolerance spaces between the nut I1 and puller nut I1 and the tube I8 and the coupling
the plunger tube 4| and the coupling 43 and the. 20 and the interior of the barrel I0. Due to the
interior of the barrel III. This reduction of paths fact that the ports 51a are graduated in diam
of escape for the fluid-from the space 56 results eter or spacing this resistance oiîered by the fluid
in the reduction of the rate of speed between the in the space 56a increases as the barrel I0 con
barrel I6 and the plunger |3 to a minimum when ' tinues to move upwardly and when the upper 15.
the opposing ends of the coupling 43 and the end of the nut I1 is in close proximity to the lower
puller nut I1 move into engagement so that even end of the coupling 20 the fluid resistance is
though these parts do come into contact there maximum with all of the ports 51a cut off and the
will be little or no jar or shock to the pump parts. fluid’ escaping only through the tolerances be
It is to be'particularly noted that the increase tween the tube I8 and the nut I1 and between the
in pressure in the fluid space 56 to a maximum coupling 20 and the interior of the barrel I0.
is not accompanied by the leakage of fluid past Fluid escaping between the coupling 20 and the
the packing rings l46 of the plunger I3. ' The tol
interior of the barrel I0 does not reach the pack
erance or clearance between the coupling 43 and ing rings 30 but escapes from the ports 51a. The
261 the interior of the barrel I0 has communication lower cushioning means l5 retards the upward
with the ports 51 that are covered or cut olf by
the coupling 43 so that the fluid escaping through
this clearance space from the space 56 is free to
escape from the ports 51 and does not continue
SOFT past the packing on the plunger I3. v'The ports
51 maybe located so that they are all cut off
from the'space 56 when the opposing ends of the
coupling 43 and the upper puller nut I1 come into
movement of the barrel I0 as it approaches the
upper'end of its stroke in such a manner that
there is little or no shock to the pump parts when
the upper end of the nut I1 strikes the lower end
of the coupling 20. When the barrel I0 begins
to move downwardly relative to the plunger II
there is space for the ample -admission of fluid
to the space 56a to the tolerances in the nut i1
contact. The tolerance or clearance between the Y and about the coupling '20 to permit of the de
ßlinterior of the nut I1 and the plunger tube 4| is sired movement of the barrel. As the downward 851
such that the free barrel I0 may begin its down
movement of the barrel continues the ports 51@
ward movement relative to the plunger I3 with are successively uncovered to the space 56'L1 per
little resistance, there being a suflicient Vinlet of mitting an increased admission of fluid to the
fluid to the space 56 and a minimum of friction
“between the tubing `4| and the nut I1.
The upper end of the lower puller nut I1 and
the lower end of the coupling 20 may come into
contact to limit the upward movement ofthe
barrel lll'relative to the Vstariding'plunger |I and
“.the lower cushioning means I5 is provided to
prevent;- shock to the pump parts when this oc
curs. The cushioning means I5 at the lower end
of the barrel I0 may be substantially identical
with the means I5 at the upper end of the barrel
space.
"
'
'
One of the cushioning means I6 is provided to
prevent shock to the pump parts when the mem
ber 45 and the upper puller nut I1 come into co
operation to limit relative movement between the
barrel II) and the plunger I3 and the other cush
ioning means I6 is provided to prevent shock to
the pump parts when the lower pullernut I1
_moves into cooperation with the enlargement 2|
to limit downward movement of the barrel I0
relative to the standing plunger II.
Referring now to Fig. 4 of the drawings which 50
’50; and which has just been described. The cush
ioning means I 5 at the lower end of the barrel I0 illustrates the lower cushioning means I6 in de
includes the space 56a in the barrel I0 between tail it will be found that the said means includes
the lower end of the coupling 2U and the upper n cooperable plunger and socket parts on the lower
end of the lower puller nut I1 and vertically puller nut I1 and the enlargement 2|. In the
55: spaced ports 51a in the wall of the barrel Ill com
particular form of the invention illustrated the 551
municating with the space 56a and controlled or lower end of the puller nut I1 has an annular
cut off by the coupling 20 when the puller nut socket 60 for receiving a plunger part 6I on the
I1 approaches the coupling 2I'I.> The ports 51ab above described enlargement 2|, it being ob
may be arranged in spaced vertical rows and 'may vious that the location of the socket 6D and the
00;. be graduated in diameter and spacing so that the part 6| may be reversed if desired. The socket
ports of the smallest capacity and of the great
66 is open to the lower end of the nut I1. The
est spacing are at the lower ends of the rows puller nut I1 may be lengthened to provide
of ports. ‘The means> I 5'at the lower end of the for the formation of a socket 60 of the desired
barrel I0 also utilizes the tolerance or clearance length. The plunger part 6| is a portion of re
65 between the interior'of theV lower puller nut I1 duced diameter on the upper end of the enlarge 65
and the plunger tube I8 and the tolerance be
ment 2|. In the form of the invention illus
~ tween the coupling!!! and the internal wall of trated the plunger part 6| is integral with the
the barrel I0 as substantially constant paths for enlargement 2| and the tube I8. The upper
the escape of -fluid from the space 56a. These
'10V tolerances or clearance spaces may have any se
lected or desired ñuid capacities to~ provide for
the desired escape of the trapped fluid from the
space
56”.V
`
,
'
The operation of the lower cushioning means
uf I6 is the same as’that of the upper cushioning
corner of the plunger part 6| may be bevelled off.
The plunger part 6| is proportioned to be re
ceived in the socket 60 when the barrel ID ap
proaches the lower end of its downward move
ment. The socket 60 and the part 6| are cylin
drical, it being understood that they may be
tapered or conical, if desired.
ais-mos
In vaccordance with the invention the _part BI
5
ward stroke of the plunger I3 the bar-rel >III may
be in ay position where its »upper puller nut I‘I is
is related to the socket 5B to be received ‘in the
socket with tolerance or clearance. This clear
ance and the clearance between the interior of
the plunger ~I3 moves downwardly it may move
thelower nut Il and the plunger tubelß con: `
downwardly through the barrel IU which may
stitute the means or paths of escape for the ñuid
tend toremain stationary or the barrel in vmay
move downwardly together with the plunger.
trapped in the socket 6I). The clearance spaces
between the ‘periphery of the part 6I and the
wall of the socket (ill and between the interior of
10 the nut I'I andthe, tube I8 may have any selected
ñuid capacities to assure the proper operation
of the cushioning means I6` under the various
conditions of ,pump operation.
‘
restingxonlor is‘adjacent the `-eouplinglll When
In practice it may be found that the `barrel IU
moves downwardly with' theV plunger I3 but‘at an
appreciably slo'wer‘rate` »than the plunger; The il()
actionrof the-barrel Il) during this phase of op
erationggdepends-:upon various factors such as the
pressurel conditions, the friction conditions and
theaction vof the packingfrings 3U and 48. As
the barrel-‘Ill and the plunger I3 move down
When the barrel I approaches the‘lower end
15 of` its downward stroke relative tothe standing
plunger,` II` the nut I'I` may move downwardlyl wardly` the iìuid` within the barrel |40 is dis
over the part El, that is, the part >ISI may be re
placed therefrom and forced upwardly through
ceived in thesocketk 6B. ` The part 6I Y,of course
trapsfluid in the socket 60 and the‘trapped fluid
20 having only limited means of escape from the
socket offers resistance to downward movement
ofthe bar-rel. The fluid trapped-in the socket
60 escapes through the tolerance space around
the plunger part 6I and through the tolerance
25 space inthe nut lI‘I and these spaces may be pro
portioned sothat the pressure on the trapped
liquid increases as the downward movement of
the barrel continues. Thus when the upper wall
the valve; II4. and the plunger I3 to discharge
into thetubing ,'I"` from the coupling 44. The
valve 4lf2 _¿ remains `closed duringthe downward
stroke. .ÉThef downward stroke may »continue un
til the lower puller Vnut Il approaches the en
largement ,2|` at the lower end of the` plunger
II at which time the plunger part 6I is received
in the socket EU. The‘fluid trapped in the socket .25
60 serves to' retard the downward movement of
the barrel IIJ` sothat the lower puller nut I »'I does
not jar against the enlargement 2|. It is be
of the socket 60 approaches the upper end of the - lieved that `the operation of the lower cushioning
30 plunger part 6I Ythe trapped fluid offers Vmaxi
mum resistancegto movement of thebarrel I0
and retards the barrel movement to such an ex
tent that there is little or no shock when'parts
on the nut I'I contact parts on the enlargement
2|.
means I6 will be fully understood from the fore
30
going detailed description.
«.At the start- of the upward stroke of the
plunger I3 the barrel I’Il may tend to remain
stationary, may move upwardly with the plunger
at the same rate as the plunger I3, or may move 35
The cushioning means I6 at the upper end of
upwardly with the Aplunger at a slower , rate.
the‘barrel I0 for cushioning the engagement of
During the upwardf stroke of the pump fluid is
the upper puller nut I 1 with themember 45 com
prises cooperable socket and plunger parts on the
said puller nut and part 45. In the case illus
40
trated „an annular socket 65 is provided in the
upper end of the upper puller nut I'I to receive
drawn into -thebarrel I0 through the plunger II
and the valve` I2` ¿and this action continues
throughout the entire upward stroke. At some 40
point during the upward travel of the plunger
'a plunger part 66 on the lower end of the mem
yber 45. . The part 65 may be integral with the
45 member 45 and may be a reduced lower end
nutr I'I. When this occurs the upper cushioning
portion of the member.
The part 66 and the
socket 65 are of the same character as the cor
responding socket and plunger elements of the
to
I.3,the.coupling 43 may approach the upper puller
means I5 4operates to accelerate the movement
of the barrel I0 so that the pump parts are not 45
subjected to shockor jar `even though the mem
ber 43 engages against the puller nut I'I. It is
believed that the operation of the upper cushion
cushioning means I6 described above. The part
65 and the socket 65 are proportioned to provide
ing means I5 will be` understood from its fore
any selected clearance between them and, there
The well pump provided by this invention em*
bodies shock absorbing means or cushioning
means that lprevent jar and shock when the stopv
means or stops on the barrel and plung‘ers come
fore, any selected rate of escape of trapped iiuid
from the socket. Ina like manner there may be
any suitable tolerance or clearance Ybetween the
plunger- tube 4I and the interior of the nutV I'I
55 to permit the vdesired fluid» escape from the
socket 65. '
»
The operation of the upper cushioning means
IB is substantially `the same as that of the lower
cushioning means.` When the member -45 on the
plungery I3 approaches `the upper puller nut I’I
the plunger part v615 enters `thesocket 65 to trap
»fluid therein which ñuid offers resistance to the
movement. `The resistance offered by the fluid
of course` depends upon the rate of its escape
from the socket and due tothe very limited dis
charge capacity of the clearance spaces in the
nut-Hand the socket 65 the fluid may offer ap
preciable resistance to movement‘so-ythat the
member45 may be brought=into engagement
with the nut; I'I with little orno jar to the pump
parts.
l C
~
In operation the pump rod 40 is -reciprocated
in the usual manner to reciprocate the plunger
75 I3‘secured to therod.` \ At the start of the down-A
going detailed description.
into ` engagement. They hydraulicI cushioning 55
means I5 and `Ilì are extremely simple and may
be inexpensively embodied in the pump struc
ture. It will be observed that most of the ele
ments of the hydraulic shock absorbing' means
I5 and I5 do not in any way interfere with the 60
normal functioning or operation of the pump
andrdovnot embody any special moving parts that
require regulation or- adjustment.
Having described only a. typical preferred form
and `application of my invention I do not wish 65
to be limited or restricted to the specific details
herein set forth, but wish ‘to` reserve to myself
any variations or modifications that may appear
toy those skilledI in the art or fall within the-scope
of the following claims,
‘
70
Having described my invention, I claim:
1. A well pump including, two plungers, one a
standing plunger, the lother a working plunger,
a barrel surrounding and movable with respect
to both plungers, valves in connection with the 75
6
2,137,403
plungers, stop parts on the barrel and YWork
ing plunger for limiting relative movement be
tween- them, said'parts defining a chamber in
the barrel, and means progressively restricting
the discharge of fluid from said chamber as the
parts move together to cushion the engagement
of the said parts.
10
15
20
25
`
Y
2. A well pump including, two plungers, one a
standing plunger, the other a working plunger,
a barrel surrounding and movable with respect
to both plungers, valves in connection Awith the
plungers, stop parts for limiting relative move
ment between the barrel and the working plung
er, means for offering progressively increasing
resistance to relative movement between the bar
rel and the working plunger as said parts move
toward one another to cushion the movement
limiting cooperation of said parts, s_top parts for
limiting relative movement betweenbarrel and
the standing plunger, and means offering pro
gressively increasing resistance to relative move
ment between the barrel and the standing plung
er as the last mentioned stop parts move together
to cushion the movement limiting-cooperation of
the last mentioned stop parts.
3. A well pump including, two plungers, one
a standing plunger, the other a working plunger,
a barrel surrounding and »movable with respect
4 to both plungers, valves in connection with the
30 plungers, stop parts on the barrel and working
plunger for hunting relative movement between.
them, and ported dash pot means for cushion
ing the movement limiting cooperation of said
parts.
35
4. A well pump including, two plungers, one
a standing plunger, the other a working plunger,
a barrel surrounding and movablewith respect
to both plungers, valves in connection with the
plungers, stop parts for limiting relative move
40 ment between the barrel and the working plung
er, _hydraulic means cushioning the movement
limiting cooperation of said parts and offering
progressively increasing resistance to movement
between the barrel and'the working plunger as
the said parts move together, stop parts for lim
iting relative movement between the barrel and
the standing plunger, and hydraulic means for
cushioning the movement limiting cooperation
of the last mentioned stop parts.
5. A well pump including, two plungers, one
a standing plunger, the other a working plunger,
a, barrel surrounding and movable with respect
to both plungers, valves in connection with the
plungers, stop parts on the barrel and working
plunger for limiting downward movement of the
barrel relative to the working plunger, means
associated with said parts for cushioning the co
operation of said parts, cooperable parts for lim
iting upward movement of the barrel relative to
60 the standing plunger, and means for cushioning
the cooperation of said cooperable parts.
6. In a well pump, a standing plunger, a. work
ing plunger, a barrel surrounding and movable
with respect to both plungers, valves on the
plungers, opposing parts on the barrel and the
working plunger operable to limit relative move
ment between the barrel and the working plung
er, said parts and the barrel deñning a, cham
ber, and means controlling the iiuid flow from said
chamber whereby the fluid trapped in the cham
ber resists relative movement between the bar
rel and the working plunger.
'
7. ~In a well pump, a standing plunger, a Work
ing plunger, a barrel surrounding and movable
75 with respect to both plungers, valves on the
plungers, opposing parts on the barrel and the
standing plunger cooperable to limit relative
movement between the barrel and the standing
plunger, there being a fluid chamber in the bar
rel defined by said parts, and means controlling
the fluid discharge from said chamber whereby
the fluid trapped therein resists movement of the
barrel when the part on the barrel approaches
the part on the standing plunger.
'
8. In a well pump, a standing plunger, a work
ing plunger, a. barrel surrounding and movable
with respect to both plungers, valves on the
plungers, opposing parts on the barrel and the
working plunger operable to limit relative move
ment between the barrel and the working plung
er, there being a socket in one of said parts, and
a piston on the other part adapted to enter the
socket when said parts approach to resist rela
tive movement between the barrel and the work
ing plunger. ,
-
20
9. In a well pump, a standing plunger, a work
ing plunger, a barrel surrounding and movable
with respect to both plungers, valves on the
plungers, opposing parts on the barrel and the
working plunger operable to limit relative move 25
ment between the barrel and the working plung
er, there being a socket in one of said parts, a
piston on the other part adapted to enter the
socket when said parts approach, and means
controlling the fluid discharge from the socket.
10. In a well pump, a standing plunger, a
working plunger, a barrel surrounding and mov
able with respect to both plungers, valves on the
plungers, opposing parts on the barrel and the
standing plunger cooperable to limit movement 35
of the barrel relative to the standing plunger,
there being a socket in one of said parts, and a
piston on the other part adapted to enter said
socket when the part on the barrel approaches
the part on the standing plunger.
11. In a well pump, a standing plunger, a
working plunger, a barrel surrounding and mov
able with respect to both plungers, valves on
the plungers, opposing parts on the barrel and
the working plunger operable to limit relative 45
movement'between the barrel and the working
plunger, said parts and the barrel defining a/
chamber, and means controlling the fluid flow
from said chamber whereby the fluid trapped in
the chamber resists relative movement between
the barrel and the working plunger, there being
longitudinally spaced ports in the barrel com
municating with the said chamber, said means
including a surface on the working plunger op
erable to successively cover said ports.
12. In a well" pump, a standing plunger, a
working plunger, a barrel surrounding and mov
able with respect to both plungers, valves on
the plungers, opposing parts on the barrel and
the standing plunger cooperable to limit rela
tive movement between the barrel and the stand
ing plunger, there being a fluid chamber in the
barrel defined by said parts. and means control
ling the fluid discharge from said chamber
whereby the fluid trapped therein resists move
ment 0f the barrel when the part on the barrel
approaches the part on the standing plunger,
said means including a surface on the standing
plunger, the barrel having longitudinally spaced
ports for communicating with said chamber and 70
progressively covered by said surface when the
part on the barrel approaches the part on the
standing plunger.
13. In a well pump, a standing plunger, a
working plunger, a barrel surrounding and mov
75
7
2,137,403
able with respect to both plungers, valves on
the plungers, opposing parts on the barrel and
the working plunger operable to limit relative
movement between the barrel and the working
plunger, said parts and the barrel defining a
chamber, and means controlling the fluid flow
t from said chamber whereby the fluid trapped
in the chamberv resists relative movement be
tween the barrel and the working plunger, there
being longitudinally spaced ports'in the barrel
of graduated fluid capacity communicating with
the said chamber, said means including a sur
face on the working plunger Ioperable to succes
sively cover said ports.
lll. In a well pump,l a standing plunger, a
working plunger, a barrel surrounding and mov
able with respect to both plungers, Valves
on the plungers, opposing parts on the bar
rell and the standing plunger cooperable to
limit relative movement between the barrel
and the standing plunger, there being a fluid
chamber in the barrel defined by said parts, and
means controlling the fluid discharge from said
chamber whereby the fluid trapped therein re
sists movement of the barrel when the part on
the barrel approaches the part on the standing
plunger, said means including a surface on the
standing plunger, the barrel having longitudi
nally spaced ports of graduated íiuid capacity for
communicating with said chamber and progres
sively covered by said surface when Vthe part on
the barrel approaches the part on the standing ID
plunger.
i5. A well pump including, two plungers, one
a standing plunger, the other a working plunger,
a barrel surrounding and movable with respect
to both plungers, valves in connection with the _
plungers, stop parts for limiting relative move
ment between the barrel and the standing plung
er, and cooperable cylinder and plunger ele
ments on the barrel and the standing plunger
for cushioning the cooperation of said parts.
20
DANIEL W. HOFERER.
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