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Патент USA US2129868

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Sept 13, 1938.
Filed Oct. 3, I936
A. P£ARso/v
8* #Q Mm
Patented Sept. 13, 1938
2,129,868 '
Albert Pearson, Western Springs, 111., ‘assignor to
Western Electric Company, Incorporated, New
York, N. Y, a corporation of New York
Application October 3, 1936, Serial No. 103,872
3 Claims.
(Ci. 204-5)
A bracket H is welded to each end of the rod
and fastened to the main frame member with
This invention relates to article supporting
racks, and more particularly to racks for plating
sheet metal.
‘ Certain articles ‘require a localized coating and
A continuous sheet is of ?bre, rubber or other
5 it is often desirable to restrict the covered areas,
insulating material, equal in width to the length
of the conductor rod is mounted around the outer
as gold or other noble metals are employed. In
some cases it is desirable to coat one side of a
ends of the frame cross arms and secured thereto
with countersunk screws it. The two ends of
particularly when costly coating materials such
metal sheet and subsequently to form the com
the sheet abut against the portions of the rod
improved method and rack for use in the applica
(not‘shown) to the main member. The project
ing portions of the half round rod are made equal
‘projecting beyond the face of the main frame 10
10 posite sheet into the article.
member and are anchored securely with screws
. An object of this invention is to provide an
tion of a localized coating on sheet material.
In accordance with. one embodiment of the
to the thickness of the sheet to insure a smooth
15 invention, a rack is provided for supporting a ‘ continuous surface at the junctures between these '
metal strip in a plating apparatus and localizing members. At the bottom of the rack, the sheet
the deposit of metal on one face thereof. vThe , nests against the rounded portion of the main
rack comprises'a continuous surface having an frame member and the rod and sheet thus col
oval section on which the strip is wound spirally
20 and clamped to prevent contact between the elec
' trolyte and the under surface of the strip.
ing current'is conducted to the strip through a
contact bar along the top of the rack.
A vcomplete vunderstanding of the invention
25 may be had from. the following detailed descrip
' tion taken in conjunction with the appended
drawing in which the single ?gure is a perspective
view of a plating rack embodying the invention.
For convenience and economy a plating rack
30 embodying the invention is adapted for use in
a conventional electroplating apparatus in which
the rack is suspended from a. his bar ID in an
electrolyte _(not shown).
As shown in the drawing, a supporting‘ frame
35 made of wood, ?bre, or other insulating material
comprises - a ' main rectangular vertical frame
member H which has a rounded bottom portion
A plurality of cross members or- arms extend
horizontally and symmetrically 4 from the two
' faces of the main member at right angles thereto.
A central cross arm I3 is supported at the ap
proximate middle of each face of the main mem
ber. Two upper cross arms l4 ‘and two lower
cross arms l5 mounted near‘the respective ends
To each end of the half round rod a formed
arm 20 of brass, copper or other conducting mate
rial is secured by welding, brazing, or other suit
able method, such as threading the arm into the
rod to provide a good electrical contact for con-‘ 25
ducting plating current to the rod. The two arms
extend upwards and are each provided with a
hook'2l for engaging the bus bar of the plating
apparatus and a handle 22 for convenient trans
portation of the rack.
At the upper left corner of the rack just below
the conductor rodis a clamp 23 threaded in the
main frame member and provided with an en
larged head of rubber or other non-conducting '
material. A similar clamp 24 is mounted on the
rear right face of the rack.
In loading the rack one end of the metal strip
25 is anchored under the left hand clamp. The
strip is then wound spirally on the surface of the '
rack and the conductor rod under su?icient ten 40
sion to insure close contact between the underside
of the strip and the rack surface. The terminating end of the strip is fastened securely with the
‘right hand clamp to hold the strip and rack in 45
proper vrelationship. Circulation of the electro
the central arms so that the ends of the cross lyte against the inner surface 'of the strip is
arms and main member describe-an approximate prevented by contact with the rack surface and
the deposit of metal on that area is accordingly
Mounted along the full length'of the top ofthe
main frame member is‘a half round rod or bar
‘ l6 of brass, copper, or other conducting material. ‘
The rod 'is- secured with the ?at surface ‘of its
semi-circular cross section in contact with the
frame member and its diameter projecting sym
55. metrically beyond the two faces of the member.
r“. .
for receiving the strip material.
of the main member are relatively shorter than
lectively provide a continuous, smooth surface
Plating current is introduced to the strip
through contact with the half round rod, which
is connected to‘ the bus bar through the support
ing arms. Introduction of current to the uni
formly spaced intervals of' the strip in contact
with the rod facilitates the electrodeposition of a
uniform coating on the strip surface.
In the plating operation, vertically arranged
anodes (not shown) are positioned on opposite
described herein can be made to accommodate
sides of the, rack and the metal strip on the
various requirements, and it is to be understood
rack serves as a cathode.
In general,.a series of
that the invention is limited only by the scope
alternate anodes and cathodes are employed with
anodes at each end of the series.
of the appended claims.
What is claimed is:
1. A plating rack for metal strip, comprising a
frame of non-conducting material, an elongated
member made of conducting material mounted
' The dimensions of the rack details are deter
10 mined largely by the composition and size of the
material to be coated. Compact and easily han
dled racks are employed for‘ brass strip .003"
thick which conforms readily to the surface con‘
tour of the rack. In constructing the rack,
15 careful consideration is directed to the frame.
members which are preferably constructed to
form the strip supporting surface into an ap
proximately oval section so that all portions of
the strip will be in close contact with the convex
20 surface of the rack. For relatively thick mate
rial it may be necessary to form the rack more
nearly cylindrical in shape to insure continuous
contact between the strip and rack? surface.
However, a rack having an elongated axis is
preferred because this construction presents the
strip more uniformly to the plating anode which
assists in control of coating thickness and also
permits a greater number of racks to be placed in
a tank’of given length.
or varnish spraying, in cases where it is desirable
to restrict the coating to one side of the strip.
Other modi?cations of the speci?c structure
The surface of the rack can be made of’ hard
rubber or phenol ?bre and in some cases may be
faced with soft rubber, depending on the size and
composition of the strip material. For plating
thin brass strip, hard rubber approximately i‘s"
35 thickv was usei satisfactorily and the thin strip
was retained in sufficiently close contact with
the rack surface without difficulty. For thicker
strip or material which does not distort easily a
soft rubber facing into which the material can
40 be imbedded may be required. Durable, non-con
ducting materials are employed for the frame,
strip supporting sheet and clamps to prevent the
deposit of metal on the rack members and to
reduce maintenance and repair costs.
A rack of this “general description is also suit
45 able for supporting strip material during coating
processes other than electroplating, such as paint
on the frame, a sheet of insulating material
mounted on the frame with its ends abutting
against the conducting member for receiving the
metal strip, a clamp mounted on the frame for se 15
curing one end of the strip, a second clamp on
the frame for engaging the other end of the strip
and holding the strip in close contact with the
insulating sheet and the conducting member, and
means for conducting plating current to the con
ducting member.
2. A plating rack for metal strip, comprising a
frame of non-conducting material having a main
vertical member and a plurality of cross mem
bers extending therefrom, a bar of conducting 25
material secured to the top of the vertical mem
ber, a continuous sheet of insulating material
secured to the end of the frame cross members
with its ends abutting the conducting bar, and an
arm ‘of conducting material extending from the‘ 130
bar for conducting plating current thereto.
3. A rack for plating metal strip, comprising
a frame having a central member and a plurality
of cross arms projecting therefrom, a bar of con
ducting materlal having a semi-circular cross
section secured to the top of the central frame
member with portions ofthe bar diameter ex
tending beyond both faces of the frame member,
a continuous sheet of insulating material secured
to the ends of the frame cross arms with its _
ends abutting the projecting portions of the con-'
ductor bar for supporting the strip, a formed arm
, secured to the bar for conducting plating current
thereto, and a plurality of clamps for securing
the strip tov the supporting surface of the rack.
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