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Патент USA US3018875

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Jan. 30, 1962
Filed June 22, 1956
2 Sheets-Sheet 1
_292 j l
Jan. 30, 1962
Filed June 22, 1956
2 Sheets-Sheet 2
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United States Patent() y f'lC€
Patented Jan. 30, 1962
FIG. 2 is a fragmentary side elevational view of the por
tion of FIG. l indicated by the arrowed lines 2, 2 on
Luther A. Blackburn, Los Angeles, Calif.
(4919 Highland View Ave., Eagle Rock, Calif.)
Filed June 22, 1956, Ser. N0. 593,152
Il Claims. (Cl. 192--116.5)
FIG. l,
FIG. 3 is a longitudinal, medial sectional view, in en
Ol larged scale of one of the pressure release valve devices
shown in side elevation in FIG. 2,
FIG. 4 is a vertical, medial sectional View in enlarged
scale of the speed responsive devices which actuate the
This invention relates to pressurized foam counter
safety means,
balanced pump jacks for oil well pumps and more partic 10
FIG. S is a fragmentary, partially sectional view taken
ularly to safety and foam conservation features in such
‘right angles to FIG. 1 at the upper end of the frame
structure and showing the connection of the counterbal
This application is a continuation in part of my prior
ancing cylinder to the crosshead supporting means at the
application, Serial No. 394,405, filed November 25, 1953,
upper end of the stroke and the engagement with the pump
now Patent No. 2,756,602, issued July 31, 1956, and re 15 means for returning escaped fluid by the said crosshead
lates to means for automatically dissipating the counter
connecting means,
balancing pressure and for disabling the actuating prime
FIG. 6 is a medial sectional view taken at right angles
mover in the event of breakage of the sucker rod string
to FIG. 5,
and to means for collecting and returning to use any of the
FIG. 7 is an enlarged medial sectional view of the piston
foam forming fluid which may escape past the foam com 20 land fluid return pump means taken on the same line as
pressing piston and cylinder means which comprise the
FIG. 6,
counterbalancing means. 'I‘hese features, while first dis
FIG. 8 is a perspective side elevation of a pump jack
closed in my said prior application are equally valuable
of the type described and claimed in my said-prior Patent
when applied to a pressurized foam counterbalanced walk
2,664,764`showing the application thereto of safety means
ing beam type of pump jack such as disclosed in my prior
embodying the principles of the safety means above de
Patent No. 2,664,764 as well as on any other pump jack
'scribed in connection with the form of the invention shown
in which the counterbalancing effect is achieved through
in the preceding figures,
compression of an elastic fluid composition.
_ FIG. 9 is an enlarged scale, vertical, median sectional
Accordingly, an object of the present invention is to
view of the centrifugal force responsive actuating means
provide safety means for pressurized foam counterbal 30 for the safety means,
anced pump jacks which responds to an effect deriving
FIG. 10 is a fragmentary, longitudinal medial sectional
from breakage or disconnection of the sucker rod string
View of the counterbalancing cylinder and piston show
from the jack and which is effective by such response to re
ing the recovering means for the foam forming material,
lease the counterbalacing pressure and to disable the prime
FIG. ll is a greatly enlarged view of the valve assem
-mover by which the jack is actuated.
bly unit associated with the foam material recovery means
Another object of the invention is to provide a safety
shown in FIG. l0, and
means embodying the above objective and which includes
FIG. 12 is a transverse sectional view taken on the line
means responsive to centrifugal force attached to a rotating
12-12 of FIG. 11.
part of the jack mechanism and which is effective in the
Referring first to FIGS. 1 through 7, the pump jack
event of increased speed of rotation of the shaft deriving 40 there shown comprises a vertical frame structure com
from breaking of the sucker rod string or disconnection
prising a base 1 supporting a prime mover, here shown
of the string from the jack to actuate other devices which
as an internal combustion engine 2, and a frame structure
in turn release the counterbalancing pressure and disable
3 including vertical cylindrical tank members 3’ which are
the actuating prime mover.
connected at their upper ends by a crown block structure
A further object of the invention is to provide devices 45 4 and adjacent their lower ends by structural members 5
for collecting escaped foam forming material in pres
and 5'; there being four of the said tank members ar
surized foam counterbalanced pump jacks and returning
ranged in spaced rectangular configuration as viewed in
the escaped material to the counterbalancing cylinder.
plan. Mechanism including a drive shaft 6 imparts re
A still further object of the invention is to provide a
ciprocation to a crosshead within the frame and the cross
foam material collecting and returning means for the 50 head
is connected to the polish rod of a sucker rod string
aforesaid type of pump jacks which includes a collecting
in- an axial line coincident with the vertical axial
sump in the piston element of the counterbalancing means
line of the frame structure. Attached to the cross head
and a pump carried by the piston and actuated as an in
is a foam pressure counterbalancing means comprising a
cident of the reciprocating motion of the piston and
cylinder 7 having a closed upper end and an open lower
cylinder of the counterbalancing means to return escaped
end slidingly engaging a stationary piston supported by
foam forming ñuid collected in the sump to the interior
of the cylinder.
With the foregoing objects in view together with such
other objects and advantages as may subsequently appear,
`two pipes 9 and 10.
The tank members 3' are con
nected through the piston supporting pipes with the in
terior of the cylinder and as the cylinder descends with
the invention resides in the parts, and in the construction, 60 the crosshead on the downstroke of the pump the pres
surized foam contained within the cylinder and tank
combination and arrangement of parts described in the
members is further Compressed and the resistance deriving
4following specification of certain presently preferred ern
from the said compression provides the necessary counter
bodiments of the invention; reference being had to the
balancing effect for the weight of the sucker rod string.
accompanying drawings which form a part of said speci
All of the foregoing structure is fully described and
fication and in which drawings:
claimed in my said prior application and the present ap
FIG. l is a side elevation of a pump jack of the type
shown in my said prior application Ser. No. 394,405; the
plication is directed to certain safety features described
view generally corresponding with FIG. 2 of that applica
therein but not claimed; said features being also useful
tion with certain portions deleted and certain other por
in pump jacks of other design which employ the pres
tions shown in greater detail through partial breaking
surized foam method of counterbalancing the weight of
away of portions of the structure for the purposes of dis
the sucker rod string. Additionally, this application is
closure of the present invention,
directed to means for conserving the foam forming ma
terials which are useful in other foam counterbalanced
pump jacks.
The engine 2 is operatively connected to a speed reducer
11 «and the driven pulley of the speed reducer is connected
by a belt 12 to a pulley 13 mounted on one end of the
shaft 6 which is journaled on suitable bearings 14 and 15
carried by the frame structure 1. The opposite- end of
the shaft 6 extends laterally beyond the bearing 15 and
has a reduced diameter distal end portion 16 (see FIG,
gages an electric switch 42 in the ignition circuit of the
engine 2 and disables the engine. The distal end of the
brake operating member 36 is connected to one end each
of two cables 43 and 44 which are trained, respectively,
over pulleys 45 and 46 and at their other ends are con
nected to valve operating yokes 47 and 48. The valve
operating yoke 48 is connected to a main valve 49 inter
posed in the pipe 10 adjacent the base of the machine and
is also connected to a normally closed blow ott valve 50
4) on which a sleeve 17 having a closed outer end is 10 in a pipe connected at one end to the pipe 10 between the
cylinder 7 and the main valve 49 and which is open to
slidingly mounted. Inwardly of the open end of the sleeve
atmosphere at its other end. The cable 43 connected to
17, the shaft portion 16 carries a pair of oppositely radially
the yoke 47 similarly operates a main valve 51 interposed
extending lugs 18 each of which pivotally supports a bell
in the pipe 9 and a corresponding blow off valve. The
crank member 19; each bell crank member including a
radially extending arm 26 engaging the open end of the 15 release of the counterbalancing pressure is necessary since
in the event of a break in the sucker rod string, upon stop
sleeve 17 and a second arm 21 spaced from and extending
ping the engine, this pressure would hold the cylinder at
normally parallel to the axis of the shaft portion 16 with
its top stroke position were it not for release of that pres
the free ends of said arms extending toward the distal end
of the shaft. When the shaft is rotated, centrifugal force
The pressure induced movement of the brake operating
developed in the arm portions 21 will tend to swing them 20
member 36 in addition to the brake applying action oper
outwardly with resultant tendency to move the sleeve 1,7
outwardly. A housing 2,2 secured to a bracket member 23
covers the above described members. The frame struc
ture 1 'carries a bracket member 24 extending laterally
ates to close the main valves 49 and 51 thus cutting oit
the communication between the tank members 3’ and the
cylinder 7 and at the same time opens the blow off valves
therefrom below the bracket 23 and a lever 25 is pivoted 25 with resultant release of the pressure in the cylinder.
With the stoppage of the engine and application of the
brake, the centrifugal means which initiated the above se
One end of the lever 25 extends upwardly and thence
intermediate its end to the distal end of the bracket 24.
toward the frame structure and terminates in a pad por
quence of actions allows the spring 38 to return the lever
25 back to normal position with resultant closing of the
end of the sleeve 17. The other Aend 28 of the lever 25 30 valve 30, but since the pressure is trapped in the line 31
and cylinder 32, the brake continues to be applied and
extends downwardly _and is connected to the handle 29 of
tion 26 disposed within the housing 22 »adjacent the closed
the main valves 49 and 51 continue to be held closed.
When, as an incident to restoring the mechanism to opera
tive condition, it is desired to release the brake and re
position adjacent the opposite side of the frame structure;
said cylinder having a piston 33 therein including a piston 35 establish communication betwcen the tank members and
a valve 30 interposed in a line 31 leading from one of the
tank members 3' to a cylinder 32 disposed in a horizontal
rod 34 projecting out of the end of the cylinder adjacent
the said opposite side of the frame structure and slightly
below a horizontal plane containing the lower edge of
the pulley 13. Pivotally mounted at 35 on the frame struc
ture above the cylinder 32 is a brake operating member
36 depending from said pivotal mounting and extending
across the path of travel of the piston rod 34. The brake
operating member 36 carries a brake shoe 37 at a point
the cylinder, a normally closed, manually operated valve
52 in a line 53 leading from the line 31 and open to at
mosphere is opened momentarily to release the trapped
pressure and upon such release, the spring 40 will pull the
brake operating member back to normal position moving
the piston rod 34 back into the cylinder and allowing the
main and blow off valves to resume their respective nor
mal open and closed positions.
Referring next to FIGS. 8 and 9, the safety means
opposite the side face of the pulley 13 which point is be
tween the pivotal mounting 35 and the point of engage 45 above described are shown as applied to a pump jack of
the type described and claimed in my prior Patent
ment of the piston rod 34 with the brake operating mem
2,664,764. In this form of the invention the pump jack
ber. A spring _38 extending between the bracket 23 and
comprises a base 54 on which is mounted a prime mover
the upper portion of the lever 25 tends constantly to urge
55, here shown as an internal combustion engine, al
that end of the lever toward the end of the sleeve 17 and
an adjustable stop element 39 carried by the bracket 23 50 though an electric motor may be equally well employed
if an energy source is available. The prime mover is
serves to limit the extent to which the spring can move the
provided with a driving pulley 56 which is connected by
lever. A second spring 40 normally holds the brake
a belt 56’ to another pulley (not shown) on the driving
operating member retracted and in contact with the piston
shaft 57 of a speed reducer 58 having a driven shaft 59
rod 34.
carrying crank arms 60 at opposite sides of the speed
At normal operating speeds the centrifugal force acting
on the bell crank members 19, 19 is insufficient to over
come the bias of the spring 3S and hence the lever is not
displaced. If, however, the sucker rod string should break
or the polish rod clamp should pull free from the polish
reducer case which are connected by connecting rods 61,
61 to an evener member 62 carried by one end of a walk
ing beam 63 which is pivotally mounted intermediate
its ends at the top of a Samson post structure 64. The
opposite end of the walking beam 63 carries a horsehead
rod, the release of the load would cause the jack to in 60 member 65 which is connected by a cable 66 to a polish
crease in speed to an extent that might wreck the entire
rod clamp 67 and the clamp is in turn connected to the
jack. In the present invention, the sudden increase in
polish rod R of the pump P. The Samson post is formed
speed causes the sleeve 17 to be shifted outwardly by
as a cylindrical tank rising from a tank base 68 and a
the bellcranks 19, 19 against the bias of the spring 38
with resultant movement of the lever 25 in a clockwise
direction as viewed in FIG. 1. This movement causes
the valve 30 to open allowing the pressure of the counter»
cylinder 69 extends diagonally upwardly through the
Samson post in a vertical plane containing the longitudi
nal dimension of the walking beam. Slidably mounted
in the cylinder 69 is a piston 70 provided with rings 76'
balancing foam to ñow through the line 31 to the cylinder
and which piston is connected to an arm 71 depending
32 with resultant projection of the piston rod 34 to the
from the walking beam adjacent the horsehead 65 by a
left (as viewed in FIG. 1) against the brake operating 70 connecting rod 72. As disclosed in the said Patent
member 36 with movement of that member against the
2,664,764, the Samson post, tank base and the lower end
bias of the spring 40 and consequent engagement of the
of the cylinder are in communication with each other
brake shoe 37 with the pulley 13. At the same time, a
and the resulting enclosed space is filled with a foam
link 41 which also serves as the connecting means between
which is subjected to sufficient pressure to cause the force
the end 2_8 of the lever 2,5 and the valvehandle 29 en
thereof exerted against the piston to serve as a counter
balance for the weight of the sucker rod string.
If the polish rod clamp should slip or be pulled off or
if the sucker rod string should break or become un
coupled the reduction in the load would cause the prime
mover to “run away” with probable extensive damage to
the pump jack. To guard against this possibility, the
Before the jaci; is restored to operative condition, the
valve 99 is manually closed and since there is no pres
sure in the counterbalancing system, the said closing
action can be accomplished without opposition by the
piston rod 97. This form of the invention relates to
pump jacks having relatively short strokes and for use
in shallower wells and consequently there is less foam
speed reducer driving shaft 57 is extended beyond the
side of the speed reducer case (see FIG. 9) and is pro
forming material to be blown off in case of accidents as
which are pivoted bell crank members ’74, ’74 having
the main foam storage chamber in the Samson post to
above described, wherefore, in the interest of simplicity
vided with oppositely radially extending lugs 73, 73 to 10 of construction, the interposition of valve means between
radially inwardly extending arms 75, 75 engageable with
a sleeve 76 slidably mounted on a reduced diameter distal
end portion 77 of the shaft and free ended arms 75', 75’
conserve this portion of the foam is dispensgd with.
Referring next to FIGS. 5, 6 and 7, there is shown a
means for conserving the foam forming materials that
normally extending parallel to the sleeve 76; said sleeve 15 may escape past the counterbalancing piston and cylinder
having a closed end 78 extending over the end of the
during the operation of the jack. The piston 8 is pro
shaft. A housing comprising a bottom portion 79 se
vided with upper, intermediate and lower sets of piston
cured to a bracket 80 extending outwardly from the side
rings 103, 104 and 10S with annular grooves 106 and
of the speed reducer 58 and an upper portion 31 secured
107 interposed between the respective sets of rings.
to the bottom portion 79. Projecting outwardly from the
Mounted in the axial centerline of the piston 8 is a pump
side of the side wall of the speed reducer beneath the
cylinder 109` having its upper end threaded into the head
bracket St) is a boss 82 terminating in an ear portion 83
of the piston and carrying a collar 109 intermediate its
projecting beyond the edge of the bracket and having a
length which engages the side walls of the piston. Slid
hole extending therethrough in which a pivot pin 84 is
ably mounted in the pump cylinder 108 is a plunger 110
disposed and on which pin a lever 85 is fucrumed; said 25 having piston rings 111 engaging the wall of the pump
lever being disposed in a vertical plane and having an
cylinder. The lower end of the pump plunger 110 is
upper end portion 86 extending above the top surface of
internally threaded to receive the threaded upper end of
the housing and at its mid length having a laterally ex
a stud 112 and mounted on the stud below the lower
tending arm lterminating in a pad portion 87 disposed in
end of the plunger is a washer 113 of greater diameter
an opening 88 in the front face of the housing and in 30 than the plunger, a collar 114 and a nut 115 0n the stud
close proximity to the end 78 of the sleeve 76. A ten
locking the washer and collar against the end of the
sion spring 89 extending between the upper end of the
plunger and simultaneously locking the stud against being
lever S5 and the side of the speed reducer case constantly
loosened in the plunger. The lower end of the stud 112 is
urges the upper end of the lever toward the gear case
threaded and receives a head 116 having a resilient cush
and a stop screw 90 in the wall of the bottom portion 79 35
117 at its lower face. The pump cylinder 108 below
of the housing serves to adjustably limit the extent to
the collar 109 is provided with diametrically opposite
which the spring can thus move the lever. The extreme
pins 118, 11S and a compression spring 119 is inter
upper end of the lever 85 is connected by a link 91 to
posed between these pins and the upper face ofthe washer
the handle 92 of a normally closed valve 93 interposed
in a line 94 extending »from the lower end of the cylinder 40 113 and constantly urges the plunger downwardly.
The groove 106 is provided with a series of ports 120
69 thence beneath the speed reducer case, thence up
extending from the groove to the annular space 121 be
wardly alongside of the engine 55, thence horizontally
tween the outer face of the pump cylinder 108 and the
above the housing and thence connecting with one end
interior of the piston and bounded at its ends by the
of a cylinder 95 having a piston 95 carrying a piston rod
head of the piston 8 and the upper face of the collar
97 which projects out of the opposite end of the cylinder
95. The counterbalancing cylinder adjacent to the inner 45 109. Adjacent the upper face of the collar 109 the pump
cylinder 108 is provided with ports 122 extending be
end thereof has a pipe 98 extending upwardly therefrom;
tween the space 121 and the interior of the cylinder 10S.
said pipe being open to atmosphere at its opposite end
The upper end of the cylinder 108 is closed by a plug
and having a valve 99 interposed therein; said valve hav
element 123 having an axial bore 124 extending there
ing an operating handle 100 disposed in the path of move
ment of the piston rod 97. For the reasons earlier 50 through; said bore being enlarged at its upper end and
carrying a ball valve element 125 loosely retained there
pointed out, the release of pressure is necessary to bring
in by across pin 126 and the bore 124 is aligned with
the member carrying the polish rod clamp to its down
an axially disposed bore 127 in the head of the piston
» stroke position
8. The lower end of the plug element 123 is further
Normally, the valve 99 is yclosed and the piston an
piston rod are retracted within the cylinder 95. The 55 provided with a bore 125 extending parallel to the bore
124 in which a ball valve element 129 is retained by a
spring 89 is suiìîciently strong to hold the lever 85 against
cross pin 130, said bore continuing as a smaller diameter
ldisplacement by centrifugal force operating on arms 75',
concentric bore 131 with resultant formation of a seat
75' of the bell crank members 749, 74 under the normal
for the ball Valve element 129. The bore 131 extends
'operating speed of the shaft 57. In the event of break
ing of the sucker rod string or like happening with re 60 upwardly to about the midlength of the plug and is in
tersected by a cross bore 132 which extends through the
sultant increase in the speed of the shaft 57, the sleeve
side of the plug and the adjacent wall of the cylinder 108
76 will be moved outwardly and move the lever 85
aiîording communication between the upper end of the
against the bias of the spring 89 with resultant opening
space 121 and the interior of the cylinder 108.
. of the valve 93 and admission of pressure to the cylinder
The exterior of the cylinder 7 at its lower end is pro
95 which, in turn, will cause the piston rod 97 to be pro 65
vided With diametrically opposite pairs of spaced ñanges
jected outwardly and open the valve 99 to release the
133, 133 and pins 134, 134 extending between each of
counterbalancing pressure. At the same time, an arm
said pairs of ilanges secure the arms 135, 135 of a yoke
. 101 depending from the lever 85 operates a switch 102
. to disable the engine in any suitable manner as, for ex
member 136 which extends across the lower end of the
ample, by shorting out the magneto M or other appro 70 cylinder in close proximity thereto at right angles to a
. priate disabling of the ignition circuit. On the dropping
plane containing the supporting pipes 9 and 10 for the
of the speed of the shaft 57, the spring 89 will return
piston 8 and consequently between said pipes; said yoke
the lever to position against the stop 91 with resultant
having a hole 137 at the mid length thereof for con
v closing >of the valve 93 and return of the switch 102 to
nection to the crosshead and sucker rod supporting
its normal position permitting operation of the engine. 75 means by which the cylinder is reciprocated. As thus dis
posed, the yoke is beneath the piston'and as the yoke
and cylinder reach the upper limit of reciprocation, the
yoke engages the pad 117 and moves the plunger up
wardly against the bias of the spring 119.
Any foam materials escaping past the rings 103 will
iirst collect in the groove 106 and since there is less re
sistance offered by the ports 120 than by the rings 104,
cylinder. The connecting rod 72 carries a collar 162 hav
ing a depending arm 163 which engages a lateral exten
sion of the plunger head 158 to limit the extent to which
the spring 155 may move the plunger 156 outwardly on an
intake stroke; said arm being of such length as to clear
the end of the stop member and the head of the plunger
having a face 164 (see FIG. l2) which lits the Wall of
the foam forming material will flow into the space 121.
From this space the liuid will ilow through the ports
122 into the cylinder 108 and upon upward movement.'
of the plunger, will ybe injected into the interior of the
cylinder 7 through the aligned bores 124 and 127 ; the ball
valve 129 serving to prevent flow from the cylinder 7
to the cylinder 108. Since the plunger is at the lower
the cylinder sufficiently closely to prevent rotative move
ment of the plunger.
Thus any foam material escaping past the rings 70’ on
Vthe piston 70 will enter the groove 154- and then enter
the pump chamber 160 and thence be expelled into the
foam containing end of the cylinder for re-use.
end of its movement at all times except for the momen
tary reciprocation imparted thereto by the yoke 136, there
is ample time for ñuid contained in the space 121 to flow
Oil well pumps and jacks are started and left unat
tended and are inspected at intervals such as replenishing
the fuel tank of the engine or, if the engine be operating
on gas or an electric motor is employed, at such times as
lubrication or other attention is required. Accordingly,
it is of the utmost importance that safety means be
employed to shut down the jack in the event that the
sucker rod string should break or the polish rod clamp
should pull off and drop the string. Also, in pressurized
foam counterbalanced jacks, it is important that the foam
materials be kept from leaking out of the only place
shown a means for retaining the foam forming material 25 where such loss might occur, i.e., past the compressing
piston. The foregoing description shows how these objec
involving the-principles above described, but applied to
tives may be achieved for such pump jacks and that the
a pump jack in which the piston moves within a cylinder
principles are equally applicable to pump jacks counter
as, for instance, a pump jack such as disclosed in my said
balanced by a moving piston in a stationary cylinder and
prior Patent No. 2,664,764. ln this form of the inven
a stationary piston in a reciprocating cylinder. Accord
tion, the piston 70 at the lower side thereof is provided
into the cylinder 108. The passage provided by the bores
128, 131 and 132 prevents the ñuid in the space 121 from
being air bound and allows it to ñow freely into the cyl
inder 108. When the plunger is moved upwardly, the.
ball 129 closes this passage causing the ñuid to be eject
ed through the discharge bores 124 and 127.
Referring finally to FIGS. 10, ll and l2, there is.
ingly, the invention is not to be deemed to be limited to
the speciñc forms thereof above disclosed by way of
and parallel to the axis of the piston from the rear end
example and it will be understood that the invention in
thereof to a point adjacent the head of the piston. A
cludes all such changes and modiñcations in the parts and
smaller bore 140 extends preferably in the axial line of
the bore 139 from the bottom of that bore through the 35 in the construction, combination and arrangement of parts
as shall come within the purview of the appended claims.
head of the piston. Pressed into the bore 139 and seated
I claim:
at the bottom thereof is a plug 141 carrying an inlet
with a bore 139 extending through the Wall of the piston _
1. In an oil well pump jack, a frame structure includ
ing guidance means for a vertically reciprocating cross
mid length and a bore 145 extends radially inwardly 40 head mounted thereon, means carried by said crosshead
adapted to be operatively connected to a sucker rod string
4from this groove and meets a bore 146 spaced slightly
with resultant suspension of the sucker rod string there
inwardly from the side wall of the plug and terminating
a stationary piston supported above the path of
in a counterbore 147 in which the inlet valve member
reciprocation of said crosshead, a cylinder connected to
142 is loosely retained by a cross pin 148. The forward
check valve 142 and a discharge check valve 143. The
plug 141 has a circumferential groove 144 at about its
end of the plug is provided with a coaxially disposed
.said crosshead for reciprocation therewith; said cylinder
annular recess 149 and the discharge bore 150 extending
parallel to the axis of the plug and spaced from the inlet
bore 146 from the rear end of the plug and terminates
ingly engaging said piston, means for supplying said cylin
having a closed upper end and an open lower end slid
der with a pressurized foam with sufficient pressure to
form a counterbalance for the weight of the sucker rod
in a counter bore 151 in the bottom of the recess 149
and a cross pin 152 and a spring 153 hold the valve 50 string suspended from said crosshead, a prime mover and
member 143 seated on the shoulder formed by the junc
ture of the bore 150 and counterbore 151. An inlet
port 153 extends through the wall of the piston from the
groove 154 therein to the bore 139 at a point that will
be opposite the groove 144 in the plug 141 when seated
in the bore 139. Thus by reason of the groove 144 and
the recess 149, the plug 141 and the valves carried there
by may be inserted in the bore in any rotative position
without interruption of the inlet and discharge passages.
The outer end of the bore 139 is counterbored to pro 60
vide clearance for a compression spring 155 surrounding
a pump plunger 156 slidably mounted in the bore and hav
ing a packing ring 157 on its inner end; the outer end of
said plunger having a head portion 158 against which the
spring 155 reacts. Preferably, a collar 159 is pressed to 65
devices actuated thereby including a rotatable shaft and
means actuated by said shaft for imparting reciprocation
to said crosshead on said guidance means, and other de
vices including means on said shaft responsive to ab
normal speed of rotation of said shaft deriving from dis
connection of at least part of the sucker rod string from
said crosshead during operation of said jack effective t0
dissipate the pressure in said cylinder and simultaneously
disable said prime mover.
2. The combination as claimed in claim l in which said
other devices comprise a fly ball device on said shaft, a
lever having one end thereof engaging said flyball device,
spring means restraining action of said fly ball device at
normal rates of rotation of said shaft and permitting said
fly ball device to move said lever when rotating at ab
normal speed, a conduit communicating at one end with
the pressure in the interior of said cylinder and with the
spring 155. The cylinder 69 adjacent the outer end there
interior of a second cylinder at its other end, a piston in
of is provided with a stop member 161 which the plunger
said second cylinder, a normally closed valve in said con
head portion 158 engages as the piston is brought to the
duit, a second normally closed valve interposed in a con
outer limit of its stroke; the final outward travel of the
duit communicating with the interior of said íirst named
piston serving to move the plunger inwardly and com
cylinder at one end and open to atmosphere at its other
press the spring 155 expelling any lluid which has entered
the bottom of the counter bore to provide a seat for the
end, means operatively connecting said piston in said
the pump chamber 160 through the inlet passage in the
second cylinder with said last named valve, and means
plug 141 through the outlet passage therein and vthrough
the bore 140 into the Vfoam containing portion of the 75 connecting said lever with said first named valve effec
tive to open said first named valve upon movement of
operated thereby in the event of abnormal speed of rota
tion of said shaft, as in the event of disconnection of at
least a part of the sucker rod string from said walking
beam, effective to release the counterbalancing pressure
said lever by said fly ball device with resultant admission
of pressure to said second cylinder and consequent move
ment of said piston in said second cylinder and opening
of said second valve and release of the pressure in said
of the "foam in said cylinder to atmosphere.
7. The combination as claimed in claim 6 in which
3. The combination as claimed in claim 2 in which said
said mechanism comprises a lever pivotally mounted
lever is operatively connected to a normally closed switch
adjacent to said ily ball device and having a portion there
in an electrical circuit controlling operation of the prime
of disposed in close proximity to a portion of said lly ball
mover and in which actuation of said lever by said ily ball 10 device, spring means holding said lever to restrain said
device opens said switch and disables said prime mover.
ily ball device from operating at normal speed of rotation
4. In an oil well pump jack, a frame structure includ
of said shaft, a conduit extending from said cylinder to
ing guidance means for a vertically reciprocating cross
a second cylinder, a piston in said second cylinder, a
head mounted thereon, means mounted on said crosshead
normally closed valve opening said cylinder to atmos
adapted to be operatively connected to a sucker rod 15 phere and having means engageable by said piston in
string with resultant suspension of the sucker rod string
said second cylinder to be moved to open position and a
therefrom; said frame structure including at yleast one
normally closed valve in said conduit `operatively con
hollow enclosed frame member additionally serving as
nected to said lever.
a supply tank for pressurized foam, a stationary piston
8. The combination as claimed in claim 7 in which
supported above the path of reciprocation of said cross 20 said lever is additionally connected to a normally closed
head, a cylinder connected to said crosshead for recipro
switch in a circuit controlling operation of said prime
cation therewith; said cylinder having a closed upper end
mover and -operable in the event of actuation of said
and an open lower end slidingly engaging said piston; the
lever by said fly ball device to open said switch and
supporting means for said piston including a pipe having
disable said prime mover.
one end connected to said tank and the other end com 25
9. In a deep well reciprocating pump operating jack
municating with the interior of said cylinder through said
including a base carrying reciprocating devices support
piston and affording means for supplying said cylinder
ing the'load of the sucker rod string extending therefrom
first cylinder to atmosphere.
with a pressurized foam under sufficient pressure to form
the counterbalance for the weight of a sucker rod string
suspended from said crosshead, a prime mover and de
vices actuated thereby including a rotatable shaft and
to the pump, a prime mover operatively connected to
means operated by said shaft for imparting reciprocation
said devices for actuating the pump through reciproca
tion of the sucker rod string by said devices, and means
for counterbalancing the load of the sucker rod string
and including a relatively moving piston and cylinder
interposed between said base and said reciprocating de
vices and a quantity of pressurized foam in said cylinder
mal speed of rotation of said shaft deriving from dis
and exerting an elastic force therein sulilcient to support
connection of at least part of the sucker rod string from
at least a portion of the load of the weight of the sucker
said crosshead during operation of said jack operable to
rod string, a normally closed valve interposed between
the foam in said cylinder and the atmosphere, and means
disconnect said cylinder from said tank, release the pres
sure in said cylinder to atmosphere and simultaneously 40 for opening said valve to release said pressurized foam,
including devices responsive to an effect deriving from
disable said prime mover.
to said crosshead on said guidance means, and other de
vices including means on said shaft responsive to abnor
5. The combination as claimed in claim 4 in which said
other devices include a fly ball device on said shaft, a
abnormal operation of said pump jack by reason of un
intentional disconnection of at least a part of the sucker
rod string from said reciprocating devices and conse
lever disposed adjacent a portion of said ily ball device
adapted to be moved by said flyball device when said 45 quent reduction of the load imposed thereon by the
sucker rod string.
ily ball device is subjected to an abnormally high rate of
l0. A pump operating jack as claimed in claim 9
rotation, a normally open valve in `said piston supporting
which further includes an electric circuit controlling
pipe, a branch conduit extending from said pipe at a point
operation of said prime mover, a normally closed switch
between said normally open valve and said piston and
being open to atmosphere, a normally closed valve in 50 in said circuit, and means `operatively connected with said
valve opening means effective to open said switch and
said branch conduit, and means operated by said lever
to stop operation of said prime mover simultaneously
effective to close said normally open valve and simulta
with the opening of said valve.
neously open said normally closed valve.
ll. A pump operating jack as claimed in claim 9 in
6. ln an oil well pump jack, a prime mover, a walking
beam mounted for oscillation on a Samson post, means 55 which said reciprocating devices are actuated by a rotat
ing shaft driven by said prime mover and in which said
valve opening devices include centrifugal force respon
by Said prime mover for imparting oscillations to said
sive devices carried by said shaft and effective to open
walking beam and including a rotating shaft and a Pitman
said valve in the event of an increase in the speed of
actuated by a crank operated by said shaft, means carried
rotation of said shaft deriving from a reduction in the
by the other end of said walking beam affording operative 60 load
imposed thereon by the weight of the sucker rod
connection with a pump operating sucker rod string to be
string by reason of unintended disconnection of at least
suspended from and reciprocated by said other end of
a part of the sucker rod string during operation of the
said walking beam, means 4for counterbalancing the
weight of the sucker rod string comprising a cylinder hav
ing one end thereof connected to a supply of foam under 65
References Cited in the file of this patent
sullicient pressure 'to serve as an elastic counterbalancing
force, a piston slidable in the other end of said cylinder
Johnson ______________ __ July l0, 1928
and connected to said walking beam for movement in
McFeaters ..... ________ Dec. 27, 1932
said cylinder so that the movement of said walking beam
connected to one end of said walking beam and actuated
incident to the down stroke of the sucker rod string moves 70
said piston into said cylinder with resultant additional
compression of pressurized foam therein, and devices in
cluding a ily ball device on said shaft and mechanism
Case ________________ __ June 2l, 1938
Saxe ________________ __ .Tune 13, 1939
Gund _______________ __ Nov. 2l, 1950
Blackburn _____________ __ I an. 5, 1954
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