Well-Screen Washer and Perforator. Page: 4 of 5
This patent is part of the collection entitled: Texas Patents and was provided to The Portal to Texas History by the UNT Libraries Government Documents Department.
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1,298,131
through said slots. Surrounding each series
. of expanders are the expansible rings '10,
which, in turn, are: 'surrounded by packers,
whiph are formed of rubber, or some other
5 suitable expansible material. The. pipe 2,
has a perforated section,. and opposite this
section, the stem 4 is also perforated, between
the collars 5, 5. Attached to the lower end
of the pipe 2, by means of the collar 12, is
10 the packer setting mechanism 13, which is-
formed of two semi-cylindiical sections 13',
13', which are- secured together at their
upper ends by meansof the collar 12; and by-
the collar 14, at their lower ends. This
(5 mechanism. has the gripping rollers 15, and,
15', 15', the former of which works in an'
outwardly curved arcuate bearing 16. The
roller 15 is mounted on a bearing pin 17,
whose ends project into arcuate slots 18, 18.
20 Cut into the sections 13', 13', and seated in
the lower ends of the slots 18, and resting
against the corresponding ends of the pin 17,
are the push springs 19, 19. The rollers
15' 15' work in recesses 20, opposite, and
25 arranged in staggered relation to, the bear-
ing 16, and are rotatable on fixed pins '21,
21; This mechanism has a water passage-
-way. 22, therethrough and the lower end of
the stem 4 is formed into a seat 23, through
30 which water may be forced down through.
said stem and through the water passage-
way 22, into the well to wash out the interior
of the:strainer, and after this has been done,
the ball 24 may then be dropped through the
35 stem into said seat to block the same and
prevent the further passage of water there-
through, for the purpose hereinafter ex-
plained.
. When it is desired to wash out and cleanse
40 the screen at any particular point, the de-
vice is let down into the' well, a sufficient
I number of joints of the 'stem 4, being screwed
together to give it the required length.'
While tke device is being let down into the
45 well, the outer pipe 2 will be sustained in
'position relative to the stem 4, by the collar
'5, which is screwed on said stem within the
reducer 3, and the - in 17, of the gripping
roll 15, ill rest i: the upper end of the
50 slot 1., said roller ret ding into the upper
end Qf, the bearing 16, 'gt of contact with
the screen 1. 'When in -aIis position, water
may be pumped down through the stein,
and it wi li pass on down through the seat
55 23, and the passageway 22, to the bottom
of the strainer, and pass up freely within
the strainer on- the outer side of the pipe
5. to wash out the interior of the strainer.
The ball 24 is then dropped down through
60 the, stem to close the seat .23. An upward
pull is then exerted on the stem 4, and the
friction of the rollers 15, 15', 15', operates
to retard and\temporarily stop the upward
movement of the packer setting mechanism
65 10$, and anchor the same against turning.The stem 4 is then turned one third of the
way around, and the cams 6, 6, 6, which nor-
mally rest :between the expanders 8, 8, 8,
contact against said expanders, expanding
them and forcing the packers 11, against the 70
screen. Fluid is then' forced downwardly
under pressure through the stem, and it will
pass out through the perforations in said
stem and 'in the outer pipe 2, into the space
between the outer pipe and the screen, and 75
.will be forced. by the packers 11, to pass
on out,'through the screen, thus'unclogging
the slits between the screen wire. The length
of the section of the screen cleansed will de-
pend -uponthe distance the packers 11 are 80
located apart. 'If. it .is desired to move the
washer upwardly, in the screen, to wash out
and clean another section thereof, the stem
4 is given another third of a turn, causing
the cams 6 to release the expanders 8,. and 85
a further upward pull on the stem will oper-
ate to release the friction rollers, 15, 15', 15'
causing a relative .downward movement of
the roller 15, into, the lower end of the bear-
ing 16, and when a 'point is' reached where 90
it is again desired to wash' the screen, the
stem may be forced downwardly, and the
friction roller .15, being held in frictional
engagement with the inner wall of.the screen
by means of the springs 19, will operate to 95
retard the downward movement of, and an-
chor the packer Setting mechanism, 13, rela-
tive to the screen 1, and another partial turn
of the stem will operate through the cams 6
to again expand the expanders 8, and set 100
the packing 11 in the screen, 'and another
section of the screen niay be then washed
out as above described.
If it is desired to lower the washer in or-
der to cleanse a lower section of the screen, 105
a downward pressure may be exerted on
the stem 4, whose lower end will contact
against. the upper end of the packer setting
mechanism 13, and force it downwardly,
causing the friction roller 15 to recede into 110
the upper end of the bearing 16, and per-
mitting the entire device to move down-
wardly into the screen, until the desired
point is reached. This roller 15, however,
is held by gravity in frictional contact with- 115
in the inner wall of the screen, and an up-
ward.pull on the stem will now cause it, in
cooperation with the rollers 15', 15', to en-
gage with the' screen and temporarily retard
the upward movement of the packed, and 120
anchor it against turning in. the screen,
and a partial rotation of the stem 4, as above
explained, will cause the cams 6 to engage
with 'the expanders 8, as hereinbefore ex-
plained, and set the packing 11, and another 125
section of the screen may then be washed
out and cleansed, as explained.
In Fig. 11, I have shown the frictional
rollers 15 having sharp cutting edges. This
form of roller is used when it is desired to 130a
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Reference the current page of this Patent.
Wilkirson, Aaron L. Well-Screen Washer and Perforator., patent, March 25, 1919; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1256490/m1/4/?q=%22%22~1: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.