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Патент USA US3024677

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March 13, 1962
J, F, HART
3,024,667
AUTOMATIC HANG~OFF FOR RECIPROCATING ROD
Filed April 25, 1959
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2 Sheets-Sheet 1
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INVENTOR.
J. F. HART
BY
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ATTORNEY
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March 13, 1962
J. F. HART
3,024,667
AUTOMATIC HANG-OFF‘ FOR RECIPROCATING ‘ROD
Filed April 25, 1959
'
2 Sheets-Sheet 2
I
INVENTOR.
J. F. HART
Bywmwiwm, 0% m7?“
ATTORNEY
Unite States
is
3,924,667
Fatented Mar. 13, 1962
1
2
3,024,667
rod line and be caught between the projection and the
stop in the next phase of the same reciprocation cycle.
AUTQMATIC HANG-QFF FGR RECIPRO
The double means comprises one means suspending the
block until a predetermined number of strokes have been
John F. Hart, Sedan, Karts, assignor to Sinclair Oil 8: UK made by the rod line, and another means which is re
Gas Company, Tulsa, Okla., a corporation of Maine
tracted from elfecting suspension at the phase of the cycle
Filed Apr. 23, 1959, Ser. No. 808,461
where the projection is a su?icient distance from the stop
12 Claims. (Cl. 74-593)
to permit the knock-off block to fall onto the rod line.
_
CATING ROD
The features of the invention will be more readily
This invention is an automatic hang-o?f device. It is
designed to disengage a reciprocating power transmission 10 understood from the following description in connection
with the accompanying drawings in which:
rod after a selected number of strokes by removing the
FIGURE 1 is a sectional top view embodying the main
tension which, in normal operation, serves to link the
features of the invention;
rod to the power source. The device is of particular
FIGURE 2 is a sectionalized side view of the invention
necessary to “hook off” or disconnect the pump from the 15 through the line 2 of FIGURE 1; and
utility in well pumping operations where it is frequently
power source permitting the well to regain a desired ?uid
level or, in some instances, to control the amount of
?uid pumped from the well over a given period of time.
In many present operations the hanging on and oif
FIGURE 3 is a sectional end view showing details of
the ratchet wheel.
Referring now to the drawings, 1 and 2 constitute rods
in a rod line for transmitting power from a reciprocating
of power to individual wells is accomplished manually by 20 power source, not shown, connected to rod 1, to a work
load (not shown) connected to rod 2. The work load,
an attendant. This invention will automatically hang-off
in the drawings, exerts a force to the left. The force
the well after a desired number of strokes have occurred.
may be due, for example, to the weight of a reciprocating
This relieves the attendant from having to be at the lo
cation when the well is to be taken off. Since the opera
pump suspended in an oil well.
The work load exerts
number of strokes, any loss of power or shut-down time
and hook 4, intact. Rod line 2 is in proximity to a stop.
In the drawings the line extends through an opening, for
example, the sleeve 3!}, in support 5 where the support
tion of the automatic hang-off is controlled entirely by the 25 sufficient force to the left to keep the linkage of eye 3,
has no effect on the total number of pump strokes before
the automatic hang-off operates. Also, if the power is
off when the attendant returns, a close indication of the
functions also as the stop.
percent pump strokes unused is shown.
The object of this invention is to provide a simple,
reliable, automatic device for “hanging off” or discon
necting a power transmission rod. Further, the counting
and control mechanism used in the invention is of very
simple construction and can be contained in a housing
to exploit its portability. The device requires at most
tional elements in a well pumping rod line. The auto
matic hang-off device is positioned so that knock-01f
very little adaptation of a conventional power transmis
sion rod line and can easily be moved from one transmis
sion rod line to another. Also, the automatic hook-off
device of this invention may be located at any convenient
distance from either the power source or the load.
As will be seen from the drawings ‘a more or less con
These elements are conven
block 7, overhangs the section of rod line 2 which is
between the stop 5 and the power side projection 6‘. In
the drawings the rod line moves to the right on the power
stroke and to the left on the return stroke. Knock-off
block 7, is big enough to clog sleeve 30 in support 5 when
it is in position 7'. Power side projection 6, and load
side projection 8, are shown in the drawings as clamps
or fasteners. These are the preferred type of projection,
since they can be put on an existing rod line quickly and
easily. However, ?xed projections may be provided at
positions 6 and 8 on the rod line 2 as, for example, by
welding or otherwise ?xedly connecting ?anges or cross
ventional rod line can be adapted for automatic hook-off
by providing a stop adjacent the rod line and in ?xed re 45 bars at these points to provide a block-hitting projection
6, and a lever-hitting projection 8. Block 7 is supported
lationship to the power source and load. The drawings
against gravity by a member which provides two seats
show a rod line support used for this purpose for the
one for a means which is unseated on each reciprocation
sake of convenience, but any other ?xed, that is, non
cycle, and one for a means which is unseated after the
reciprocating, member can be used or placed adjacent
desired number of reciprocations. This may conveniently
the rod line. The rod line itself is provided with a
be the cross-member 44, which is illustrated and which
projection between the coupling means and the stop and
pivots around the fulcrum 15.
a projection between the stop and the pump load. The
The automatic actuating mechanism for the block 7,
projection on the power or coupling side is so arranged
is contained in the box 32, which may be supported by
that on the power stroke a distance is left between the
legs 34, and/or the support 5 and transported by means
projection and the support that is larger than the knock
of the handle 56. The control-counting device com
off block and on the return stroke is smaller than the
prises, basically, a sensing means which is responsive to
knock-off block. The projection on the load side of the
each reciprocation cycle of the rod line and which re
stop is positioned Where it will strike a counter mechanism
tracts one of the block-keepers on each cycle and which
lever on the power stroke. Once the rod line is adapted
in this way, the counting and control device of this in 60 records the number of cycles performed in order to re~
tract the other block-keeper when the desired number
vention may merely be placed in the proper relationship
to the support and projections and set to operate after
a predetermined number of strokes.
The counting and control mechanism of this invention,
of cycles is completed. In the preferred embodiment
phase in the reciprocation of the line when the projection
between the coupling and the stop will be out of the way
The counting mechanism comprises the bar 16, pivot
lever assembly 18, pin 38, ratchet pawl 19, ratchet wheel
illustrated the sensing means is the lever 9, which ex
tends through a slot 36, in the bottom of the box 32,
besides its desirable feature of portability uses a double 65 and which is attached to the box through pivot 10. In
the event of overstroke of the rod line 2, a friction
retractible means for keeping the knock-off block sus
break point 24, may be provided on lever 9 to shear,
pended away from the rod line and for insuring that when
preventing damage to the automatic disconnect mecha
the knock-off block falls, it will be after the desired
msm.
number of reciprocations of the transmission line and at a
of the block, so that the block will fall squarely on the
17, cam 20, threaded shaft 21, and movable bead 22.
3,024,667’
3
4
Lever 9 actuates the counting mechanism through a con
nection at its upper end to the bar 16, which in turn is
load which is held together by tension due to the load,
connected to pivot lever assembly 18. This assembly
pivots around pin 38 which fastens it to the box 32, by
being provided with a ?rst projection between the stop
means of tongue 40. Assembly 18 is biased to the right
at one end by spring 25 and is attached at the other end
to ratchet pawl 19. Cam 20, controls the amount of
coupling and the stop, said control device comprising
the bottom of lever 9, on the power stroke, cause move
ment of the shuttle 13, leftward off the seat 46, of mem
ber 44.
sive to movement of the sensing means, and means for un
having a stop between the coupling and the load and
and the load and with a second projection between the
sensing means and a knock-off block, said block being
adapted to be caught between the stop and the said sec
ond projection when said block rests on said rod line,
rotation of ratchet wheel 17. For example, by moving
thereby breaking the tension between power source and
the cam 20 radially inwardly, the movement of pawl 19
along the teeth of ratchet wheel 17 is restricted so that 10 load, said knock-off block having suspension means and
being held against the force of gravity away from said
the wheel moves less on each cycle. Circular movement
rod line by a shuttle and an arm which seat on the sus
of the wheel brings about rotation of the threaded shaft
pension means, said sensing means being adapted to move
21, which is ?xedly attached to ratchet wheel 17, and
in response to the movement of said ?rst projection on
extends through the box 32, being seated on end bear
each reciprocation of the rod line, means for unseating
ings 48. An internally threaded movable head is pro
said shuttle responsive to movement of the sensing means,
vided on this shaft. The bead is prevented from rotating
and means for unseating said arm responsive to a prede
with the shaft, and thus moves gradually toward the
termined number of movements of the sensing means.
end of the box 32, remote from the cross-member 44
2. A counting and control device for use in combina
and the knock-off block 7 upon repeated movements of
the lever 9 and rotation of wheel 17. The movable bead 20 tion with a reciprocating power transmission rod line
having a coupling between the power source and the load
may be, for example the split nut 22, which can be easily
moved to any starting position, and which can be kept
which is held together by tension due to the load, having
from rotation by the track 50 which slidingly engages
a stop between the coupling and the load and being pro
the split nut. Arm 23, is biased by spring 27, towards
vided with a ?rst projection between the stop and the load
projecting from box 32 and is provided with a head 52,
and with a second projection between the coupling and
and extends through the box, seating on cross-member
the stop, said control device comprising sensing means
44, at 54. The head 52, as can be seen from FIGURE 1,
and a knock-off block, said block being adapted to be
overhangs the path of the movable head or nut 22. As
caught between the stop and the said second projection
bead 22 contacts and moves head 52, arm 23 is drawn
when said block rests on said rod line, thereby breaking
leftward off the seat 54 of member 44.
30 the tension between power source and load, said knock
Lever 9 also bears the pin 11, which engages the
off block having suspension means and being held against
slotted end 12, of shuttle 13, which slidingly extends
the force of gravity away from said rod line by a shuttle
through a sleeve in support 42, outside the box to the
and an arm which seat on the suspension means, said
cross-member 44, of block-support 14. Shuttle 13, is
sensing means being adapted to move in response to the
biased by the spring 26 and is of such length that each
movement of said ?rst projection on each reciprocation
rightward movement of the rod line 2, projection 8, and
of the rod line, means for unseating said shuttle respon
seating said arm comprising a rotatable threaded shaft
carrying a movable internally threaded head which is pre
The device works as follows:
40 vented from rotation with the shaft, means responsive to
To initiate operation, split nut 22 is positioned towards
movement of the sensing means for rotating said shaft
the end of shaft 21 away from ratchet wheel 17, and
and a head attached to said arm adapted to be engaged
control cam 20 is adjusted to allow pawl 19, to engage
by said movable head to move the arm in a direction
the number of teeth necessary to advance split nut 22 to
remote from said suspension means to unseat said arm
engagement with head 52, after the selected number of
responsive to a predetermined number of movements of
pump strokes. On each power stroke left projection 8
the sensing means.
moves lever 9, causing rotation of shaft 21 and move
3. The apparatus of claim 1 in which the suspension
ment of split nut 22, toward the ratchet wheel end of
means is a cross-member pivotally connected with the
shaft 21 and track 50. When the split nut 22 strikes head
block.
52, it moves arm 23 to the left, unseating the arm from
4. The apparatus of claim 1 in which the stop is a
the cross member 44. Pin 11, on lever 9, is located in 50 support for the rod line.
slotted end 12 of shuttle 13, so that the shuttle is un~
5. A counting and control device for use in combina
seated from member 44, on each cycle as rod line 2 ap
tion with a reciprocating power transmission rod line hav
proaches the end of the power stroke. Therefore, at
ing a coupling between the power source and the load
the end of the power stroke after the unseating of arm
which is held together by tension due to the load, having
23, cross-member 44, of the block support 14, is free to
a support between the coupling and the load and being
pivot around fulcrum 15, allowing block 7 to fall on
provided with a ?rst projection between the support and
rod line 2. Subsequent movement of rod line 2 to the
the load and with a second projection between the cou
left on the return stroke causes the clamp or other pro
pling and the support, said control device comprising a
jection 6, to hit the block, now at position 7’ prevent
sensing means and a knock-off block, said block being
ing further leftward movement of rod line 2. With the 60 adapted to be caught between the support and the said
tension on the line removed hook 4 is free to move in
second projection when said block rests on said rod line,
eye 3. The hook, unseated from the eye by gravity, will
thereby breaking the tension between power source and
thus disengage and fall to the ground.
load, said knock-off block having suspension means com
From the above description it can be seen that this
prising a cross-member pivotally connected with the block
automatic knock-off device is adaptable for many re~
and
being held against the force of gravity away from
ciprocating transmission devices, particularly a reciprocat
said rod line by a shuttle and an arm which seat on the
ing pump line, operating to disengage the power source
cross-member, said sensing means being adapted to move
after a selected number of strokes. It is understood that
in response to the movement of said ?rst projection on
the drawings and description are illustrative only, and
each reciprocation of the rod line, means for unseating
various modi?cations and changes can be made without
said shuttle responsive to movement of the sensing means,
departing from the spirit of the invention.
I claim:
and means for unseating said arm comprising a rotatable
1. A counting and control device for use in combina
threaded shaft carrying a moveable internally threaded
tion with a reciprocating power transmission rod line
bead which is prevented from rotation with the shaft,
having a coupling between the power source and the
means responsive to movement of the sensing means for
8,024,667
5
6
rotating said shaft and a head attached to said arm adapt
ed to be engaged by said moveable bead to move the
thereby breaking the tension between power source and
load, said knock-01f block having suspension means com
prising a cross-member pivotally connected with the block
and being held against the force of gravity away from
arm in a direction remote from said cross-member.
6. Apparatus comprising a reciprocating power trans
mission rod line having a coupling between the power
source and the load which is held together by tension due
to the load, having a stop between the coupling and the
said rod line ‘by a shuttle and an arm which seat on the
cross-member, said sensing means being adapted to move
in response to the movement of said ?rst projection on
each reciprocation of the rod line, means for unseating
load and being provided with a ?rst projection between
said shuttle responsive to movement of the sensing means,
the stop and the load and with a second projection be
tween the coupling and the stop, in combination with a 10 and means for unseating said arm comprising a rotatable
threaded shaft carrying a moveable internally threaded
counting and control device which comprises a sensing
bead ‘which is prevented from rotation with the shaft,
means and a knock-off block, said block being adapted
means responsive to movement of the sensing means for
to be caught between the stop and the said second pro
rotating said shaft .and a head attached to said arm
jection when said block rests on said rod line, thereby
breaking the tension between the power source and load, 15 adapted to be engaged by said moveable bead to move
the arm in a direction remote from said cross-member.
said knock-off block having suspension means and being
11. A counting and control device for use in combina
held against the force of gravity away form said rod line
tion with a reciprocating power transmission rod having
by a shuttle and an arm which seat on the suspension
a coupling between the power source and the load which
means, said sensing means being adapted to move in re
sponse to the movement of said ?rst projection on each 20 is held together by tension due to the load, having a ?rst,
?xed, stop between the coupling and the ‘load and being
reciprocation of the rod line, means for unseating said
provided with an actuation means between the stop and
shuttle responsive to movement of the sensing means, and
the load and with a second, reciprocating, stop between
means for unseating said arm responsive to a predeter
the coupling and said ?rst stop, said control device com
mined number of movements of the sensing means.
7. Apparatus comprising a reciprocating power trans 25 prising a sensing means, a knock-off block adapted to be
caught "between said stops when the block rests on said
mission rod line having a coupling between the power
rod line, ?rst and second holding means cooperating to
source and the load which is held together by tension due
hold said knock-0E block out of position between said
to the load, having a stop between the coupling and the
stops, said sensing means adapted to be actuated by said
load and being provided with a ?rst projection between
the stop and the load and with a second projection be 30 actuation means upon reciprocation of the rod line, said
sensing means upon actuation serving to release said ?rst
tween the coupling and the stop, in combination with a
holding means when the distance between said stops is
counting and control device which comprises a sensing
suf?cient to accommodate the knock-elf block, and means
means and a knock-o?f block, said block being adapted
for releasing said second holding means in response to a
to be caught between the stop and the said second pro
jection when said block rests on said rod line, thereby 35 predetermined number of rod reciprocations, the release
of said ?rst and second holding means permitting the
breaking the tension between the power source and load,
knock-off block to be caught between said stops thereby
said knock-off block having suspension means and being
breaking the tension between power source and load and
held against the force of gravity away from said rod line
by a shuttle and an arm which seat on the suspension
releasing said coupling.
12. Apparatus comprising a reciprocating power trans
means, said sensing means being adapted to move in re 40
mission rod line having a coupling between the power
sponse to the movement of said ?rst projection on each
source and the load which is held together by tension due
reciprocation of the rod line, means for unseating said
to the load, having a ?rst, ?xed, stop between the cou
shuttle responsive to movement of the sensing means,
pling and the load and being provided with an actuation
and means for unseating said arm comprising a rotatable
threaded shaft carrying a movable internally threaded 45 means between the stop and the load and with a second,
head which is prevented from rotation with the shaft,
reciprocating, stop between the coupling and said ?rst
means responsive to movement of the sensing means for
rotating said shaft, and a head attached to said arm
stop, in combination with a counting and control device
which comprises a sensing means, a knock-off block
adapted to be engaged by said movable head to move the
adapted to be caught between said stops when the block
arm in a direction remote from said suspension means to 50 rests on said rod line, ?rst and second holding means co
operating to hold said knock-oft block out of position be
unseat said arm responsive to a predetermined number of
tween said stops, said sensing means adapted to bevactu
ated by said actuation means upon reicprocation of the
rod line, said sensing means upon actuation serving to
?ea?s is a cross-member pivotally connected with the
55 release said ?rst holding means when the distance be
oc .
tween said stops is su?icient to accommodate the knock
9. The apparatus of claim 6 in which the stop is a
off block, and means for releasing said second holding
support for the rod line.
means in response to a predetermined number of rod
10. Apparatus comprising a reciprocating power trans
reciprocations, the release of said ?rst and second hold
mission rod line having a coupling between the power
source and the load which is held together by tension due 60 ing means permitting the knock-oil? block to be caught be
tween said stops thereby breaking the tension between
to the load, having 'a support between the coupling and
power source and load and releasing said coupling.
the load and being provided with a ?rst projection be
movements of the sensing means.
8. The apparatus of claim 6 in which the suspension
tween the support and the load and with a second pro
jection between the coupling and the support, in combina
tion with a counting and control device which comprises 65
a sensing means and a knock-01f block, said block being
‘adapted to be caught between the support and the said
second projection when said block rests on said rod line,
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,320,051
2,334,943
2,633,801
Robinson ____________ __ May 25, 1943
Miller et al ___________ __ Nov. 23, 1943
Clements _____________ __ Apr. 7, 1953
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