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Патент USA US2130184

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Sept. 13,1938.
2,130,184
C. G. HOPKINS
STRAIGHT LIFT PUMPING UNIT
_
Filed Feb. 16, 1937
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Patented Sept. 13, 1938
UNITED STATES PATENT OFFICEÁ
2,130,184
STRAIGHT LIFT PUMI'ING UNIT
Christopher G. Hopkins, Nashville, Tenn.
Application February 16, 1937, SerialNo. 126,058
11 Claims. (Cl. 74-103)
This invention relates to lift pumps for pump
ing oil, gas and analogous uses, and is particu
larly concerned with pumps generally classed> as
of the walking beam straight line lift type.
Various types of linkage mechanism have'been
Ui
devised for imparting a supposedly straightline
movement to the polish rod of a lift pump, or for
converting the arcuate movement of the walking
beam into rectilinear movement. There are
10 certain objectionable features to known mecha
nisms of this type. The linkage mechanism is
not only complicated in most instances, but ac
tual experience shows that the supposedly recti
linear movement is not in fact true, and that the
1.5 polish rod is being wobbled or slightly bent dfur
ing the» pumpingoperation. This may not be in
evidence until after the pump has been in use
for some time, but eventually it shows up through
wear on the polish rod and bearings and loose
ness of the coacting parts. In a number of
instances, the complicated system of linkage
mechanism is not sufñciently rigid and strong to
give the desired life to the pumping unit.
The primary object ’of the invention, therefore,
25 is to provide a pumping unit of the straight line
lift type wherein the arcuate movement imparted
to the walking beam is converted into true recti
linear movement, thereby giving a true straight
line action to the polish rod, and to accomplish
30 this desired result with mechanism of a simplified
type.
Another object is to provide a straight line lift
pump unit wherein the mechanism for convert
ing arcuate into straight line motion is not only
35 of' a simpliñed type but embodies relatively
great strength and is capable of long life with a
minimum of Wear on the coacting parts.
Another object of the invention is to provide
a straight line lift pump unit embodying a par
4 O ticularly advantageous type of straight line
toggle linkage mechanism which in addition to
imparting a true straight line movement to the
polish rod serves to brace the walking beam
against a tendency toward rotation in a hori
4
zontal plane.
The foregoing and other objects and advan
tages will become apparent in View of the fol
lowing description taken in conjunction with
the drawing, wherein:
Fig. 1 is a View in side elevation of a lift pump
embodying the features of the present invention.
Figs. 2 and 3 are, respectively, horizontal and
vertical sectional views taken substantially on
55 the lines 2_2 and 3--3 of Fig. 1.
Fig. 4l is a diagrammatic representation of the
action of the improved lift pump.
Generally speaking, the runit consists of a main
stationary frame structure herein termed a. main
or stationary Samson post having mounted on
the upper extremity thereof an. arcuatelymov
able Samson post by means of which the walking
or rocking beam is given a floating mounting.
The movable Samson post and walking beam
have connected thereto a particular arrangement L@
of toggle linkage whereby the conversion of ror
tary into straight line movement is carried out.
Referring in detail to the drawing, the numeral
5 indicates a base on which is disposed the sta
tionary frame structure or main Samson post, 15
generally indicated at B. Asshown the station
ary Samson post is made up of skeleton frame
work, and at the upper extremity thereof theV
framework is extended horizontally outward.
To provide for this extension, >side beams 1 are 2.o
rigidly connected to the upper end of the irame- '
work 6 and converge inwardly, as attic,` and at
their ends are constructed to provide a link shaft
bearing as at 8.
,
Approximately inthe axially central portion of 25
the Samson post 6 is mounted a supplemental
Samson post or beam supporting Vmember 9,
which at its lower end is pivotally supported on
a shaft I0. A rocking or walking beam II is
pivotally mounted on the upper end of the mov- 30
able post 9 through the mediumvof a bearing
block or shoe IIa. Since the post 9 Vis >permitted
to swing arcuately on shaft I Il and since the beam
I I is permitted a like movement on saidzpost, the
beam is given a floating support or mounting on 35
the main stationary Samson post or~framework 6.
At one end said beam i's'provided-with a bear
ing bracket I2 which is pivotally connected to
the polish or lift rod I3 of a well pump, the latter
not being shown in the drawing since its par- 40
ticular construction forms’no'part of the present
invention. At its opposite end, the beam II is
operatively connected with a drive unit
through the medium of aV connecting rod I5;
I4
Toggle mechanism comprising horizontal links 45
I6, I'I and vertical link I8 is provided. Links
I6 are pivotally connected at one end to the post
9 through‘the medium of a shaft I9 and atvthe
opposite» end thereof to the linkn I'I through the
medium of a shaft-2D. Link I'I at its-outer end is 50
pivotally anchored to the frame- extension 'Ia
through the’medium of the member 8. Link I8
at its upper end is provided with a pivoted bear
ing block 2l which is secured to the walking beam
II, and at its lower end has bearing on shaftZIl, 55
2
2,130,184
the latter serving as a common connection for
the inner ends of the respective links.
In operation, assuming that the first movement
of the connecting rod I5 will be an upward thrust
from the position shown in Fig. 1 and that the
polish rod is to be given a downward stroke. The
thrust of the connecting rod I5 will have a tend
ency to move the stroke end of beam I I arcuately,
but this tendency is resisted by the links I6 and
I1 which at this time lie straight or, as shown,
in a horizontal plane.
The movement of the
I9 and IIJ in the same vertical plane, and links
I‘B and I'I should be of the same length. How
ever, the length of the floating Samson post 9
does not have to bear any definite or fixed relation
to the length of the walking beam. Obviously,
the longer it is made, the less will be its deviation
from a vertical plane while in operation.
How
ever, if the length of the post 9 is increased to too
great an extent, manufacturing costs as well as
transportation and assembly cost would be in
creased. For most practical purposes, the rela
beam end Will therefore be straight downward,
tive dimensions shown in the drawing will prove
and as the restraining links I'B and I1 break
and move downwardly, the beam will float out
wardly and its end continue to move downwardly.
It will thus be seen that the post 9 rotates through
satisfactory.
a controlled and predetermined arc governed by
the links I6 and I1, the end of the beam which is
connected to the polish rod I3 moving‘in atrue
vertical, line. The same >operation holds true
throughout 'the full upward and downward stroke
of the beam II.
,
_
A check may be made on the foregoing descrip
tion Vof operation by referring to the diagram in
25 Fig. 4 in conjunction with the following trigono
metric calculation:
Let a=any angular movement of Iwalking beam
Then D=L-L cos a »
And D/2=2a:-2a: cos a
The foregoing calculation assumes that the
n
' I It should be noted, however, that it is not nec'
essary toy locate pivot point I9 midway of pivot
points IIJ and IIa. If for any reason it should
be desired to locate I9 nearer to I0, for example,
than Ato I Ia, links I6, I1 and I8 may be length
45 ened tor compensate for such`change. Accord
ingly D/2 becomes a variable factor and may be
substituted by K. We then have:
Then
substantially adhered to, the maximum deviation
of the’links I6 and I'I from a horizontal plane
would be approximately fourteen degrees, which ‘
has very little effect on the mechanical efficiency
of the apparatus while in operation.
The arrangement herein disclosed is strong and
rugged and may be adapted to both heavy duty
and light service and yet at the same time, it is
simple in construction and involves relatively few
moving parts.
It will also be noted that the horizontally ex
tended frame structure having the linkage con
nected thereto in the manner shown braces the 30
ing wobbling due to such action.
combined lengths of the links I6 and> I'I, or the
distance between axes of I9' and 8, equals one
half ,the distance between theaxes of IIa and I2
and that the pivotal axis ofV I9 lies midway be
Y
the proportions illustrated in the drawing are
or oscillate ina horizontal arc, thereby overcom
and A moves in a true vertical line.
t
In operation, the strain on the pivots or bear
ings of the links I6 and Il increases in propor
tion to the deviation of said links. However, if
walking beam II against any tendency to swing
Therefore zc=L/4 for any position
tween AIII and IIa.
10
'
K.L (1~cos a) =2rc (1-cos a)
and K.L=2:1,`
KL
.
fb?
It will be noted that the angle generated due
to the angular travel of the walking beam is the
same as that of the links I6 and I1, and that the
respective lengths of the said links are the same.
60 Thus if the movable post 9 and links I6, I1 and
I 8 together with the walking beam I l are initially
set or arranged so that the said post lies'in a
true" vertical plane, the polish rod connected to
thevone end- of said beam must always be actu
65 ated `in a plane whose axis lies parallel to the
initial vertical'axis of said post.
By checking the diagrammatic illustration in
Fig. 4, it will be notedfthat the quadrilateral de
fined by the links I6 and I8 and the portions of
70 the Walking beam and movable post 9 which lie
between the-pivotal points 2I--I la and II a--IB
constitutes a parallelogram. Thus there are cer
tainA parts which must bear a deñnite or fixed
relation to one another; pivot points IIa, 2| and
75 I2 should lie in the same horizontal plane and I Ia,
It will be readily understood that certain vari
ations in structure and design may be adopted
within the scope of the invention as deñned by
the appended claims.
35
I claim:
l. In a pumping unit, a walking beam, a mov
able support providing a ñoating mounting for
said beam, a stationary upright frame for said
support, and means for converting the arcuate
movement of said beam into rectilinear move
ment at the pump-operating end thereof com
prising linkage mechanism connected in toggle
45
relation on a common pivotalaxis, said mecha
nism including opposed links arranged substan
tially horizontally with their ends remote from
said axis pivoted respectively to the support and
frame and an intermediate link having its re
mote end pivotally connected to the said beam.
2. In a’pumping unit, a stationary support, a
walking beam, a movable Samson post mounted
on said support and providing a floating mount
ing for said beam, and means for converting the 55
arcuate movement of said beam into rectilinear
movement at the pump-operating end thereof
comprising linkage mechanism connected in
toggle relation on a common pivotal axis, said
mechanism including opposed horizontal links 60
having their ends remote from said axis pivoted
respectively to the post and frame and an inter
mediate vertical link having its remote end pivot
ally connected to the said beam, said links being
of such relative lengths that the angular travel
of the restraining links is the same as that of the
walking beam.
3. In a pumping unit, a main stationary frame
structure or Samson post, a movable Samson post
pivotally mounted on said main Samson post, a 70
Walking beam pivotally mounted on said movable
VSamson post, and means for converting the arcu
ate movement of said beam into rectilinear move
ment at the pump-operating end thereof com
prising a plurality of restraining links connected 75
2,130,184
in T-shaped toggle relation, including opposed
links pivotally connected respectively to the mov
able Samson post and the stationary Samson post
and an intermediate link arranged substantially
perpendicularly to said opposed links and pivot
ally connected to said beam.
4. Ina pumping unit, a main stationary Sam
son post, an arcuately movable Samson post piv
otally mounted on said stationary Samson post,
10 a walking beam mounted on said movable Sam
son post for arcuate movement in a plane par
allel to the plane of movement of said latter post,
and means for converting the arcuate movement
of said beam into rectilinear movement at the
15 pump-operating end thereof comprising a plu
rality of restraining links connected in toggle
relation including opposed links arranged sub
stantially horizontally, the outer end of one of
the horizontal links being pivoted to said mov
20 able Samson post and the outer end of the other
horizontal link beinCf pivotally anchored to said
stationary Samson post, and an intermediate link
arranged substantially perpendicularly to the
horizontal links and having its upper or outer
25 end pivotally connected to said bea-m.
5. In a pumping unit, a main stationary Sam
son post, an arcuately movable Samson post piv
otally mounted on said stationary Samson post,
a Walking beam mounted on said movable Sam
30 son post for arcuate movement in a plane par
allel to the plane of movement of said latter post,
and means for converting the arcuate movement
or" said beam into rectilinear movement at the
pump-operating end thereof comprising a plu
35 rality of restraining links connected in toggle
ve.
8. In a pumping unit, a ñxed Samson post, an
arcuately movable Samson post mounted on the
upper end of said ñxed post, a Walking beam
pivotally mounted at an intermediate point on
said movable Samson post, means operatively
connected to one end of said beam for impart
ing a rocking movement thereto, the opposite end
of said beam having an operative connection with
the polish rod of a pump unit, and means for
converting the arcuate movement of said beam 10
into rectilinear movement at the point of its
connection with the polish rod comprising a plu
rality of restraining links connected in toggle
relation on a common pivotal axis and including
opposed links pivoted respectively at their outer 15
ends to the movable Samson post and the fixed
Samson post and an intermediate link pivotally
connected to said beam, said opposed links when
`in a neutral position lying in substantially a
horizontal plane with the intermediate link ar 20
ranged perpendicularly thereto.
9. In a pumping unit, a main stationary frame
structure or Samson post, a movable Samson post
pivotally mounted on said main Samson post,
a Walking beam pivotally mounted on said mov 25
horizontal link being pivotally anchored to said
able Samson post, and means for converting
the arcuate movement of said beam into recti
linear movement at the pump operating end
thereof comprising a plurality of restraining links
connected in toggle relation, and including op 30
posed links pivotally connected at their outer
ends respectively to the main Samson post and.
the movable Samson post and an intermediate
link pivotally connected at its upper end to said
beam, a parallelogram being defined by the in 35
termediate link, that portion of the walln'ng beam
which lies between its pivotal connection with the
intermediate link and the movable Samson post,
that portion of the Samson post Which lies be
tween its pivotal connection with the Walking 40
stationary Samson post, and an intermediate link
beam and the adjacent toggle link, and said latter v
arranged substantially perpendicularly to the
link.
horizontal links and having its upper or outer
upper end of said ñxed posta walking beam piv
10. In a pumping unit, a main stationary frame
structure or Samson post, a movable Samson post
pivotally mounted at its lower end on said sta 45
tionary Samson post, a walking beam pivotally
mounted on the upper end of said movable Sam
son post, a plurality of restraining links con
otally mounted on said movable Samson post, a
nected in toggle relation including opposed links
relation and including opposed links arranged
substantially horizontally, the outer end of one
of the horizontal links being pivoted to said mov
able Samson post and the outer- end of the other
end pivotally connected to said beam, said op
45 posed links being of substantially the same length.
6. In a pumping unit, a fixed Samson post, an
arcuately movable Samson post mounted on the
50 pair of horizontal restraining links pivotally con
nected at their inner ends to a common axis and
at their outer ends pivotally, respectively, to the
ñxed Samson post and the movable Samson post,
and a third link arranged perpendicularly to hori
zontal links and having its lower end pivotally
connected to said axis and its upper end con
nected to said beam.
-
7. In a pumping unit, a iìxed Samson post, an
arcuately movable Samson post mounted on the
(il) upper end of said i'lxed post, a walking beam
pivotally mounted at an intermediate point on
said movable Samson post, means operatively
connected to one end of said beam for imparting
a rocking movement thereto, the opposite end
of said beam having an operative connection
with the polish rod of a pump unit, and means
for converting the arcuate movement of said
beam into rectilinear movement at the -point of
its connection with the polish rod comprising a
plurality of restraining links connected in toggle
pivotally connected at their outer ends respec 50
tively to the stationary Samson post and the
movable Samson .post and an intermediate link
pivotally connected at its upper end to said beam,
and a polish rod having a pivotal connection with
the pump operating end of said walking beam, 55
the pivotal connection of the upper ends of the
movable Samson post, the intermediate link of
the toggle and the polish rod lying in the same
horizontal plane, and the pivotal connections of
the movable Samson post with the walking beam, 60
the adjacent toggle link and the stationary Sarn
son post lying in the same vertical plane.
1l. In a pumping unit, a main stationary frame
structure or Samson post, a movable Samson post
pivotally mounted on said main Samson post, (i5
a walking beam pivotally mounted on said mov
able Samson post, and means for converting the
arcuate movement of said beam into rectilinear
movement at the pump operating end thereof
comprising a plurality of restraining links con 70
relation on a common pivotal axis and including
nected in toggle relation, and including opposed
opposed links pivoted respectively at their outer
links pivotally connected at their` outer ends re
spectively to the main Samson post and the
movable Samson post and an intermediate link
ends to the movable Samson post and the fixed
Samson post and an intermediate link pivotally
connected to said beam.
pivotally connected at its upper end to said beam, 75
4
2,130,184
the inner ends of all of said links being pivoted
Walkingr beam and the adjacent toggle link, and
on a common axis, a parallelogram being deñned
said latter link, and the pivotal connections of
the movable Samson post with the walking beam,
the adjacent toggle link and the stationary Sam
by the intermediate link, the portion of the Walk
ing beam which lies between its pivotal connec
Ui
"
tion with the intermediate link and the movable
Samson post, that portion of the Samson post
which lies between its pivotal connection with the
son post lying in the same vertical plane.
CHRISTOPHER G. HOPICINS.
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