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Патент USA US2121316

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June 21, 1938.
Filed June 13, 1936
am A\NSTEm
Patented ‘June 21, 1938
Arthur B. Case, Snomac, Okla, assignor to The
Texas Company, New York, N. Y., a corpora
_ tion of Delaware ‘
‘ Application‘June 13, 1936, Serial No. 84,999
3 ‘ Claims.
My invention relates to well pumping appara
tus, and more particularly to an apparatus‘ for
automatically stopping an engine used in' pump
ing the well in the event of failure or breakage of
5* parts of the equipment, or other accidental oc
currences during pumping operations.
In pumping‘ oil wells, failure of certain parts
of the equipment frequently occurs. For in
A stance, the string of sucker rods or polish rods
10‘ may break or separate. Also, the drive belt may
break or slip, causing the engine to run away
or suddenly speed up due to the sudden release
of the load to which it was subjected before such
accident. 'It quite often happens that the op
‘ erator or attendant is not near enough to shut
down the pumping engine vat the time of such
occurrence, and serious damage may, and fre
quently does,
The primary object of my invention is to pro
20 vide an apparatus which will automatically shut
down an engine in case of any of the afore
mentioned accidents, and thereby prevent any
serious damage which might otherwise occur.
In carrying out my invention I have provided
25 a tripper arm situated near the polish rod and
connected by means of a cable to the engine
valve which is open during normal operation.
. Should one of the rods break, however, the arm
, will be tripped and the valve will automatically
30 close. I have also provided a movable arm con
nected by a cable to the engine valve and mount
ed directly under the lower side of the drive belt
in such a manner that should the belt break it
will fall upon the arm and cause the valve to
35 close.
For a better understanding of my inven
tion, reference may be made to the accompany
ing drawing in which
Figure 1 is a side View showing my apparatus
in operative position.
Figure 2 is a plan View taken on the line 2—2
of Figure 1.
Figure 3 is an enlarged sectional elevation of
the engine valve and governor.
Figure 4 is a side elevation of the arm on the
45 lower side of the drive belt.
Referring to the drawing, a polish rod I0 is
adapted to be reciprocated vertically in a well
by any conventional means, such as that in which
an internal combustion or gas engine shown
50 diagrammatically at Illa‘ drives a walking beam
to which the rods are attached. Since the en
glue and beam do not form a part of my inven
tion they have not been fully illustrated. - A
clamp II is secured to the polish rod in, and a
55 pin I2 is secured to the clamp II. A tripper arm
(01. . ill-3)
I3‘ is ‘pivotally mounted on bolt
i4‘ passing
through a double bracket l6 which is attached to
a post I‘! erected on the derrickv?oor IS.
front, end of the‘ tripper arm l3 extends closely
adjacent to the polish rod [0, and is arranged to
be‘ slightly above the pin I2 when the rods ID
are at the top‘ of a normal stroke.‘ A loose block
I 9 is normally held in place on the bracket I6
and over the back end of the tripper arm I3 by
a pin 20 which is rigidly secured to arm I3 and
extends upwardly‘therefrom and into a hole 2|
in block I 9. The loose block 19 is fastened to a
rigid block 22‘ by ?exible wires 23 and is con
nected to valve 24 located in the engine fuel
supply line‘ 25‘by a wire cable 26 passing over 15.
pulleysZl, 28 and 29. A weight 29a is attached
to the cable 26 and hangs between the pulleys 28
and 29‘. 'Should‘the rods part, the upper rod I0
is thrown'upwardly, causing the pin l2 to strike
and‘ raise the front end of the tripper arm I3,
withdrawing the pin 20 from the block l9 and
allowing the block [9 and wire 26 to travel to
ward the engine house, not shown. The weight
29 will fall and a lever arm 30 on engine valve
24 will be pulled upwardly, allowing the valve
to close thereby shutting off the fuel supply to
the engine.
' The valve 24, shown more clearly in Figure 3,
and which is also shown in my U. S. Letters
Patent No. 1,739,207 granted December 10, 1929,
comprises the lever arm 30 pivoted to the valve
housing at 30a and adapted to cooperate with
the valve stem or rod 3| to hold the valve 33
normally open against the force of valve spring
33a which biases the valve toward its closed po
sition. The valve stem 3| is provided with a
small lug 34 adapted to engage a similar lug
34a on the arm 30 when the arm is in its normal
or horizontal position and the valve 33 will thus
be held open. However, when the arm 30 is
pulled upwardly the lugs 34 and 34a will be dis
engaged and the valve will be closed by the
spring 330..
A governor 35, which is of the ordinary cen
trifugal type driven by the engine, not shown,
is used to automatically shut down the engine
should the enginebe suddenly accelerated be
yond a predetermined speed. In this arrange
ment, fuel is supplied to the engine at the de
sired amount, according to the load which the
engine must carry to maintain a certain con
stant speed. A release pin 36 is secured to and
depends from the lever arm 30, and is of a length
such that when the fuel supply valve 24 is open
the pin extends close to but slightly above the
governor disc 31 while running at normal speed.
The length of the pin 36 depending from the
arm 30 may be adjusted so that in case it is de
sired to run the engine at a relatively high speed,
the pin will not be contacted by the governor
disc 31 unless a still higher undesired speed is
attained. When the motor is suddenly speeded
up due to some unintended event such as the
breakage or slipping of the drive'belt, the gover
nor disc is raised and strikes the pin 36 thus
10 tripping the valve 24 to its closed position, shut
ting o? the fuel supply to the engine.
Another feature of my invention comprises a
movable arm 38 lightly mounted on a post or
block 39 which is secured to the derrick floor
15 I8 directly under the lower side of the drive belt
40. The arm 38 is mounted on a pin 4| pro
jecting from the post 39, and is attached to the
post by a nail 42 driven through arm 38 and
into the post 39 only to such depth as is neces
20 sary to support the arm in a horizontal position.
A wire cable 43, passing over pulleys 44 and 45
is attached at one end to arm 38, and is con
nected at its other end to cable 26 and thus to
lever ‘30 of. engine valve 24 as shown in Figure
1.' Should the belt 40 break it will fall upon
the movable arm 38, forcing it downwardly, caus
ing the wire '42 to pull the arm 30 upwardly al
valve in an emergency, said means including a
supporting post, a tripable member pivotally
mounted on said post and disposed adjacent said
pump rod, a pin secured to said pump rod, and
a connection between said member and said valve,
the arrangement being such that in the event
of a sudden abnormal increase in speed of said
driving ‘means, vsaid pin will strike and move
said tripable member to close said valve.
2. In combination with a reciprocatory well
pump rod and an engine for actuating said rod,
a valve for controlling the admission of fuel to
said engine, a tripper arm disposed adjacent said
rod, means connected to said rod for engag
ing and moving vsaid arm on a predetermined 15
~overtravel of said rod, releasable means for bias
ing, said valve toward its closed position, and
means connecting said arm to said releasable
means so that the movement of said arm will
cause said biasing means to close said valve.
3. In combination with a string of reciproca
tory well pump rods and an-engine for actuat
ing said string, a valve for controlling the admis
sion of fuel to said engine, a ?xed bracket, an
arm pivotally'mounted on said bracket, one end
of said arm extending closely adjacent to said
rod string, ‘a pin secured to the other end of said
arm, ad'oose-lblock normally "resting on said brack
lowing the spring 33a to close the valve 24, thus - et and provided with an opening adapted to re 30
stopping the engine.
ceive ‘said pin, a cable ‘for connecting said block
Obviously ‘many modi?cations and variations to said valve, a weight supported by said cable,
of my invention may be made without depart
and 'means attached to said rod string for en
ing from the spirit and scope thereof, and there
gaging and raising the extended vend of said arm
fore only such limitations should be imposed as so as ‘to pull said pin from the opening in said 35
are indicated in the appended claims.
block in case said rod string should part, the
\ I claim:
arrangement being such that on the release of
1. In combination with a reciprocatory pump
said block by said pin, said weight will fall, caus
rod and driving means forsaid rod including an
said valve to close.
internal combustion engine, a valve in the fuel
supply line in said‘engine, means for closing said
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