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Патент USA US2411638

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\ Nov. 26, 1946.
Filed De'c. 27, 1943
Patented Nov. 26, 1946
Selden, Bradley vSanford, Yonkers, N._ Y., and
WilliamGeorge Nutzel, Nutley, N. J ., assiimorsv
.. to Otis Elevator Company, New. York, N. Y., a'
corporation of_New Jersey
" I
I ' Application December 27, ieia'seriai
515,338 - "
' I 2 Claims-,7“ (01. 204-279)
The invention relates to apparatus ‘for electro- .’ ' iron or’ reinforced wood. It is provided with a
lead lining ' Ii which is not affected by an aqueous ,
solution‘of sulphuric acid employed as the elec-‘.
In practicing electrolytic processes it is essen
tial that there be no direct electrical contact
between the electrodes, In some of these proc
trolyte. _:In the “anodizing”, process, the tem-y
perature of the solutionlis an important factor and for this reason a coil lZ-bf lead pipe is pro
esses, a metal lining for the tank is utilized as
an electrode. This is the case, for example, ‘in
the process of forming arti?cially on aluminum
vided within the tank through which hot or cold v
' water may bepassed to'control the temperature.
It is also important that the temperature,
throughout the solution be uniform.v To obtain-V
this-result, the solution is agitated by air ad
articles a protective coating composed substan
tially of aluminum oxide, known as “anodizing.”
While the process employed to form‘ such oxide‘
mitted to ‘the tank‘‘ through. the lead pipe [3. .
This pipe has a deadenddand runslongitudinally
coatings on aluminum may vary, depending prin- ,
cipally upon the use orv after treatment of the
of the tank ‘along the bottom and midway be
article, in one process widely used, thealuminum
surface is treated. electrolytically as anode in an
aqueous solution of sulphuric, acid. In this proc
ess a lead lined tank is employed and this lining
is utilized as the cathode.
, , i
15 '
three sections, one Of which forms the bottom
trolytic processing tank, especially a metal lined
tank 'in whichthe lining is utilized as an elec
The insulating shield may, be fabricated in
{The object of the inventionis to provide a
Outlet holes. not shown, are.
provided in the pipe ‘through which the airpasses
into the electrolyte. '1 v
durable insulating shieldafor, use in an’ elec
tween the ' sides.
ligand the other two the sides l6.- Each section
comprises-a plurality of, main members H, a,
plurality of cross, members [8 and a plurality;
of warpmembers 20.» These members are of 'non- -
metallic electrolyte resistant material and are
In-carrying outtheinvention according to the
' preferred arrangement, the insulating shield is 25
formed of a plurality of spaced main members
and a pluralityhof cross members extending be
tween the main members. Along the bottom, the
preferably made of tubing. A‘ bendable plastic
material such as “Saran” which is synthetic resin
comprising polymers derivedv from .vinylidene'
chloride has been found especially suitable for’.
this purpose.
main ‘members extend across the tank and the
cross members longitudinally of the tank. Along 30 The cross members are of- smaller‘ diameter
the sides, the main members extend vertically
than the main members and extend through holes
2| drilled in the main members. Templates are
employed in drilling the holes‘in the main mem
bers. These holes are equally spaced so that
main members and preferably parallel thereto 35 when a section is formed these cross members
are equidistant and parallel. The cross mem
are warp members with which the cross members
bers for the bottom section are at right angles‘
are interwoven to provide a mesh like structure.
to the main members. As regards the sides, the
All of these members are of an insulating plastic
and serve as posts while the cross members ex
tend around the sides and ends of the tank,
preferably in the form of a spiral. Between the
which is chemically resistant to the electrolyte.
Thus a basket like insulator is formed which does
not restrict the ?ow of current between electrodes,
which obviates any direct contact between elec
trodes, and which lasts inde?nitely.
Features and advantages of the invention will
main members, after being drilled, are sawed off
at increasing distances from the bottom so that
when the shield is installed these cross members
may form a continuous spiral.
The warp members 20 are positioned between
the main members in parallel relation thereto.
become apparent from the following description 45 The warp members may be of the same diameter
as the cross members and may be either of
and appended claims.
straight pieces of tubing as illustrated adjacent
The invention willbe described as applied to
an “anodizing” tank.
In the drawing:
Figure 1 is a plan view of an electrolytic proc
essing tank embodying the invention; and
the‘ ends of the bottom section or of longer pieces
of tubing bent over upon themselves to form two
50 warp members joined at one end in the nature of
a hairpin as more clearly shown in Figure 2 for
a side section. The cross members I8 are in- .
Figure 2 is a view in section, taken along the
terwoven with the warp members, being bent
line 2—2 of Figure 1.
alternately under and over the warp members as
Referring to the drawing, the tank l0 may be
made of any suitable material, such as sheet 55 illustrated to form a-basket weave construction.
After each side section has been assembled it
is bent at the corners to ?t the tank inside the
lead coil. With material such as “Saran” a per
manent set may be made by immersing in boiling
water for about a minute and then cooling in tap
Water. The side sections are then joined by join
ing the ends 22 of the abutting cross members
electrode comprising; a bottom portion for shield
ing the bottom of the tank; and an upright por
tion for shielding the side and end walls of the
tank; each portion comprising a plurality of
spaced main members, each having a plurality of
cross apertures equally spaced lengthwise thereof,
with tubular inserts (not shown). The bottom
section is inserted in the tank ?rst and is bent
said apertures, and a plurality of warp members
a plurality of cross members extending through
down on each side from theair'pipe 13: The: 10,.
joined side sections are then inserted, meshing‘:
them at the bottom with the bottom section to
hold this section in place When‘the- electrolyte‘is:
between and parallel to said main members with
which the cross vmembers are interwoven, the
main members of the upright portion extending
vertically and having their apertures positioned
therein so thatithe cross members of such portion
admitted to the tank. The main’ members ‘of -the ‘
' form an-upwardlyextending spiral, and all of said
side section may be close together at‘th‘e corners:
as illustrated to facilitate meshing with the bot
tom section. The bottom section may alsobetied;
to the lead pipe I2 to assist in holding it in.
members beingjof, bendable tubing of synthetic
resin resistant" to the chemical action of the
2. Aninsulating shield for an electrolyticv proc
essing ‘tank having a, metal lining serving as an
The number and size of the various members 20 electrode comprising; a section for shielding the
making up the'insulating shield may vary de
bottomofethe-tank; and apai-r of'sections’for
pending upon the particular installation. For
shielding the side and end walls :of'lth'e-tankl;
each" sectionkcompri-sing, a plurality ofr'spaced
example; in a tank, 4 feet-Wide by 8 feet ‘long by
main=members each having a plurality of 'cross 5“feet deep, for which an insulating shieldhas
1 apertures equally spaced lengthwise thereof, a
been constructecLthe main members are made of
plurality ‘of cross members extendingthrough
limb tubing and-the cross members and warp
said apertures,‘ and a pluralityof ‘warp members
membersof 1%; inch tubing, Most of the main
between’ and: parallel to said main members with
members are spaced about 17 inches and the
which the cross members’ are. ‘interwoven, the ~
cross members are spaced 11/2 inches. The Warp
members-are spaced about 2%; inches. This gives 30 .main» members of the bottom shielding» section
a su?iciently stiff construction to insure no direct
contact of anode ‘with the cathode or pipes while
at the same ‘time it provides meshes of ample size
not to materially restrict the circulation of elec
trolyte or flow of vcurrentloetween electrodes.
While described in connection with a tank uti
lized for “anodizing,” the invention has other
applications. As many changes could bemade in
the- above construction and many, apparently
widely different embodiments of this invent-ion
could be made‘without' departing’ from the scope
thereof,- it is intended that all matter contained
in the above description or'shown in the accom
extending crosswise-of the bottom of the tank
and‘those-of'said pair of side- and endshielding
sections extendingvertically, said pair of sidezand ‘
end shielding sectionsbeing bent to ?t the'tank
35 at the corners and the ends of the'cross» members
thereof being joined in abuttingrelationship with
the relationship of ‘said ‘- apertures in the main
members thereof such that‘ithesecross-members
form: a continuous upwardly extending spiral,
said-pair of side and- end shielding-sections inter
meshing‘rwith the bottom shieldin‘gwsection whenv
panying drawing shall be interpreted-as illustra
the sections 'are'in place vin'the- tank,‘ and alliof"
said members of all sections being tubing of tli'e'r-Y
moplasti'c synthetic resin comprising polymers
tive and not in a limiting sense;
derived'ifrom vinylidene chloride.
What is claimed is:
1. An’ insulating shield for an electrolytic proc
essing tank having ametal'lining' serving as an
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