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Патент USA US3052782

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Sept. 4, 1962
R. J. WALTER
3,052,771
SAFETY SWITCH FOR PUMPING UNITS
Filed Feb. 24, 1960
2 Sheets-Sheet 1
IN VEN TOR.
Raymond J. Walter
_
-
Sept- 4, 1962
R. J. WALTER
3,052,771
SAFETY SWITCH FOR PUMPING UNITS
Filed Feb. 24, 1960
‘
2 Sheets-Sheet 2
,
IN VEN TOR.
Raymond J. Walter
United States Patent 0 “ice
3,052,771
Patented Sept. 4, 1962
2
1
ferred speci?c embodiment of the new safety switch of
the invention, such being made with reference to the
3,052,771
SAFETY SWITCH FOR PUMPING UNITS
Raymond J. Walter, 75 S. Lincoln, Russell, Kans.
Filed Feb. 24, 1960, Ser. No. 10,708
drawings whereon the same reference numerals are used
to indicate the same or similar parts and/0r structure.
It is to be understood that such discussion and description
is not to unduly limit the scope of the invention.
The safety switch of the invention, shown in the draw
4 Claims. (Cl. 200-52)
This invention relates to a safety switch for pumping
units, and, more particularly, to a switch which can be
mounted on the polish rod of a well pumping unit in such
a manner that the switch will be closed if the pump rod
in the well is broken, which in turn will short out the
ings generally at 10, is designed primarily for use with
well pumping units, usually called a pump jack. A typical
well pumping unit is shown in FIGURE 1 and includes
magneto of the power source and shut down the engine.
ed on a platform or base 16.
a gasoline engine 12 having a magneto 14 suitably mount
The motor 12 drives a
wheel 18 on which a pitman 20' is eccentrically mounted.
Devices exist in the prior art which are designed to
The other end of pitman 20 is secured to a walking beam
pump rod by providing some means for shorting out or 15 22 which is pivotally mounted and supported by pillar
prevent injury to the pumping unit upon breaks in the
bearings 23 on Samson post 24. The other end of the
stopping the engine of the pumping unit. These devices
have proved to be unsuccessful or unsuitable for their
walking beam 22 has a horsehead 26 secured thereto. A
that they will function properly.
mounted on the polish rod 34 above the hanger bar in a
manner to be explained more fully hereinafter.
The safety switch of the invention, as best seen in
FIGURES 2, 3, and 4, includes an elongated tubular
housing or body 40 which is open at one end, and which is
closed at the other end by a threaded plug or cap 42. The
hanger bar 28 is secured to the pump rod 30 a short dis
intended job due to either the complicated and fragile
tance beneath the horsehead 26. The cables for the
structure of the devices, the expense of purchasing and
maintaining them, or the difficulty in mounting them so 20 hanger bar 28 are shown at '32. The safety switch 10 is
In accordance with the present invention a new and
improved safety switch for pumping units has been pro
vided which overcomes the disadvantages of the prior art.
The present device is lightweight in construction and can
be easily mounted in a minimum length of time on the
polish rod of the pumping unit. The device is so mounted
relative to the hanger bar that any break in the pump rod
is instantly sensed by the switch and transmitted to the
magneto of the drive means of the pumping unit which
is immediately shorted out. The present safety switch is
relatively small in size when compared with the prior art
devices which provides an additional savings in expense
for shipping. The safety switch of the invention can be
manufactured primarily from standard or stock items
with a minimum amount of machining which further re
duces the overall cost.
Accordingly, it is an object of this invention to provide
a new and improved safety switch.
Another object of the invention is to provide a new
safety switch which will instantaneously short out the
magneto of the power unit of a well pumping engine if a
pump rod breaks.
A still further object of the invention is to provide a
new and improved safety switch which is economical to
construct and inexpensive to ship.
A further object of the invention is to provide an im
proved safety switch which is easily mounted on a well
pumping unit.
open end of the tubular housing or body 40 can be re
duced in diameter as shown at 44. Housings of shapes
other than the tubular one shown can, of course, be used.
30
35
40
45
An elongated rod 46 is slideably mounted in the hous
ing or body 40 and extends through the open end of the
housing. The end of the rod 46 within the housing 40 has
an enlarged, metallic contact point or ?ange 48 rigidly
secured to the end of the rod 46. The contact point 48
is preferably disc-shaped and secured to the end of the
rod 46, however if desired it can be a projecting flange
and secured to the rod intermediate the ends thereof.
The other end of the rod 46 has a diagonally extending
‘slot 50 cut through the center of the rod and in which
a trigger 52 is pivotally secured by a pivot pin 53. The
trigger is preferably bent intermediate its ends so that the
portion of the trigger 52 or one side of the bend is longer
than the portion on the other side of the bend, and it is
pivotally secured on the rod in slot 50 in the bent portion.
An insulated terminal 54 passes through the side of the
housing 40 and has a metallic contact point on plate 56
on the inside of the housing 40. Contact point 56 is
preferably disc-shaped. The terminal 54 is secured to the
side of the housing by a nut 58, or other suitable means.
The terminal 54 is insulated from the housing 40 by
pieces of insulating material 60 and 62 on the outside and
Various other objects, advantages and features of the 50
invention will become apparent from the following de
inside of the housing 40* respectively.
scription taken in connection with the accompanying
A spiral spring 64 within the housing 40 urges the con
drawings, in which:
tact point or plate 48 on the rod 46 continually toward
FIGURE 1 is a side elevation view of a common well
pumping apparatus showing the invention in place there 55 the contact point or plate 56 on the insulated terminal 54.
on.
FIGURE 2 is an enlarged isometric view of the im
proved safety switch of the invention.
The spiral spring 63 can be received within a suitable
recess 64 in the plug or cap 42 to keep it centered on the
plug. Other suitable means can, of course, be used to
urge the contact points 48 and 56 into contact with each
FIGURE 3 is an elevation view of the safety switch of
60 other. For example, a suitable resilient material such
the invention.
as rubber or synthetic foams of suitable dimensions and
FIGURE 4 is a cross sectional view taken along the
resiliency can be used. ‘
line 4—4 of FIGURE 5.
As best seen in FIGURES 2 and 5, the safety switch
FIGURE 5 is a top view of the safety switch mounted,
I 10 of the invention can be secured to the polish rod 34 of
on the polish rod.
The following is a discussion and description of a pre 65 a well pumping device by means of clamp sections 66 se
3,052,771
3
cured together by a bolt 68 and a nut 70. Other means
can, of course, be used to mount the safety switch in
position.
constructed and adapted so that when a break occurs in
the well pumping unit, said trigger on said rod will be
released from engagement with the hanger bar and said
helical spring will then urge said contact point of said
rod into engagement with said contact point of said in
sulated terminal to thereby short out the magneto of the
pumping motor.
In operation, the safety switch 10 of the invention is
secured to the polish rod 34 by the clamp means 66 in
such a way that the helical spring 63 is compressed and
the contact points 48 and 56 are not in engagement with
each other. This is done by mounting the switch 10
2. In a safety switch for use with a well pumping unit
above the hanger bar 28 with the short end of the trigger
having a gasoline engine with a magneto thereon, a walk
52 in engagement with the hanger bar and with the spring 10 ing beam, a pitman connecting one end of said walking
63 compressed. With the switch 10 in this position, an
beam to the gasoline engine, a horsehead on the other
insulated wire 72 having a suitable conductor therein,
end of the walking beam, a polish rod depending from
is attached to the exposed end of the terminal 54 and
the horsehead, and a hanger bar secured to the jump rod,
the other end of the wire is attached to the magneto 14
the improvement comprisng, in combination, an elongated
of the power means. As long as the switch remains in
tubular housing open at one end, a threaded plug closing
this position with contact points 48 and 56 separated,
said housing at the other end, an elongated rod slideably
the engine 12 will continue to operated. Should a break
mounted in said housing and projecting therefrom
occur in the pump rod 30, the trigger 52 will be released
through said open end, an enlarged disc-shaped metallic
‘from engagement with the hanger bar 28 as a result of
contact plate secured to the end of said rod within said
recoil and the spiral spring 63 will immediately urge the
tubular housing, an insulated terminal passing through
the side of said housing and secured thereto, said termi
contact points 48 and 56 into contact with each other.
This shorts out the magneto 14 of the engine 12 and
automatically shuts down the engine. As will be ob
served from FIGURES 2, 3, and 4, the trigger 52 is so
nal having a metallic contact plate on the inside thereof
plastics can be used. Use of aluminum materials also
eliminates the formation of crust on the moving parts
and said contact plates on said rod and said terminal are
which would impair the efficiency of the device.
While the invention has been described in connection
constructed and mounted so that when a break occurs in
and having the ‘outside connected to said magneto of
said engine, a spiral spring compressed within said hous
constructed that one portion to one side of the bent 25 ing between said threaded plug and said contact plate
portion of the trigger is smaller than the other portion.
on said rod continually urging said contact plate on said
When mounting the device, the smaller portion is placed
rod toward said contact plate on said insulated terminal,
in engagement with the hanger bar. With the trigger in
a diagonally extending slot through the center of the end
this position, only the slightest movement of the hanger
of said rod projecting from said housing, a trigger piv
bar will be necessary for the trigger 52 to pivot about 30 otally mounted on said rod within said diagonally ex~
the pin 53 which allows the contact points 48 and 56 to
tending slot, said trigger being bent intermediate its ends
come into engagement with each other.
and pivotally joined to said rod in said bent portion
The housing 40, cap or plug 42, and rod 46 are pref
thereof, an adjustable clamp removably securing said
erably made of aluminum or aluminum alloys to reduce
safety switch to said polish rod so that said trigger en
the shipping weight and cost, however, other metals and 35 gages said hanger bar and said spiral spring is compressed
with a preferred embodiment thereof, it will be under
stood that this deScription is intended to illustrate and not
to limit the scope of the invention.
As will be evident to those skilled in the art, various
out of engagement with each other, said device being
a polish rod said trigger on said rod will be released from
engagement with said hanger bar and said spiral spring
will then urge said contact plate on said rod into engage
ment with said contact plate of said insulated terminal to
thereby short out said magneto to stop said engine.
3. A safety switch for well pumping units or the like
in the light of this description and discussion without 45 comprising, in combination, a housing having an opening
departing from the spirit of the disclosure or the scope
therein, an elongated rod slideably mounted in said hous
ing and projecting therefrom through said opening there
of the claims.
-I claim:
in, an electrical contact secured to the end of said rod
within said housing, an electrical contact mounted inside
1. A safety switch ‘for well pumping units comprising,
in combination, an elongated tubular housing open at 50 said housing and connectable by an electrical conductor
to the magneto of a pumping engine, means within said
one end, a threaded plug closing said housing at the other
housing engaging said rod and biasing said electrical con
end, an elongated rod slidably mounted in said housing
modi?cations of the invention can be rnade, or followed
and projecting therefrom through said open end, an en
tact on said rod into engagement with said electrical con
tact mounted within said housing, a trigger freely pivot
larged disc-shaped metallic contact point secured to the
end of said rod within said tubular housing, an insulated 55 ally. mounted on the end portion of said rod outside said
housing to assume a vertical and horizontal position, said
terminal passing through the side of said housing and
trigger having end portions at an angle to each other and
secured thereto, said terminal having a metallic contact
point on the inside thereof connectable by an electric
conductor to the magneto of a pumping motor, ‘a helical
mounted on said rod at the intersection of said end por
tions, said switch being constructed and adapted to be
spring compressed within said housing between said 60 mounted on a well pumping unit or the like with one end
portion of said trigger in engagement with apparatus in
threaded plug and said contact point on said rod con
the well so that when a break occurs in the apparatus said
tinually urging said contact point on said rod toward
trigger is released and said means within said housing
said contact point on said insulated terminal, a diagonally
extending slot through the center of the end of said rod
engaging said rod urges said electrical contacts into en
65
remote from said contact point, a trigger pivotally mount
gagement to thereby short out the magneto of the pump
ing engine.
ed on said rod within said diagonally extending slot, said
trigger being bent intermediate its ends and pivotally
4. Safety switch means for the power circuit of well
joined to said rod in said bent portion thereof, an adjust
pumping units and the like having pumping apparatus ex—
able clamp engageable with said housing and operable 70 tending into a well comprising, in combination, a housing,
to removably secure said safety switch to a polish rod
rod means slideably mounted in said housing and having
of a well pumping unit so that said trigger engages the
one end portion thereof projecting therefrom, an electri
hanger bar thereof and said helical spring is compressed
cal contact connected to the other end portion of said rod
and said contact points on said rod and said terminal
means and positioned within said housing, an electrical
are out of engagement with each other, said device being 75 contact mounted on said housing and engageable in oper
3,052,771
6
5
ation by said ?rst-named contact, means engaging said
rod means and biasing said electrical contact thereon,
trigger means freely pivotally mounted in an intermediate
portion on said one end portion of said rod means to in
operation assume a vertical and a horizontal position, said
trigger means having one end portion normally engaging
said pumping apparatus in operation to maintain said
contacts in position to maintain said power circuit closed,
and said trigger means constructed and mounted so that
when a failure occurs in said pumping apparatus to break 10
contact with said trigger means said trigger means is re
leased and said means with said rod means biases said
electrical contacts into position to maintain said power
circuit open.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,429,004
Wachsman ___________ __ Oct. 14, 1947
2,572,372
2,577,479
Montgomery __________ __ Oct. 23, 1951
Owen et al. ___________ __ Dec. 4, 1951
2,671,162
2,711,462
2,928,912
Beline _______________ __ Mar. 2, 1954
Rouse _______________ __ June 21, 1955
Molnar ______________ __ Mar. 15, 1960
2,953,659
Edwards _____________ __ Sept. 20, 1960
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