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Патент USA US2120478

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June 14, 1938.
Filed FebQ 13, 1936
2 Sheets-Shee‘l'l 2
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Patented June 14, 1938
< 2,120,418
Paul L. Amundsen, Detroit, Mich.
' Application February 13, 1936,y serial No. 63,691
2 Claims.
' This invention relates to a tumbling barrel
which is so treated that it is suitable for use
in plating solutions, cleaning solutions such as
acid pickling and alkaline cleaning solutions,
5 and rust-proofing solutions of all types.
A barrel is used in such a, solution for process
ing small articles which cannot be done indi
vidually in practical operation. In order to se
cure contact of the solution with all parts of the
10 mass of small articles the barrel is usually kept
rotating, turning the. pieces being processed
over and over, constantly subjecting new sur
faces to the action of the solution until all have
been treated.
Heretofore, many materials have been used
in an effort to find a suitable composition from
'_ which to make a barrel for use in_chemical solu
tions having corroding properties, but for one
reason or another none of them has proven quite
ture. chip, crack o_r swell under the severe action
of heat, solution and impact of pieces of metal
being tumbled about inside. Here, too, the per
iorations must be smallor fewer in number than
is desired in order to have the sides of the barrel
substantial enough to carry the load.
In the art of cleaning, pickling and rust
prooñng, considerable difliculty has been 'ex
perienced in finding ' suitable material from
which to construct tumbling barrels for use in 10
the various solutions, because of corroding qual
ities of the solutions. In some cases electricity is
used and the same difllculty of procuring eco
nomical current transmission arises.
It is the object of this invention to provide a 1
tumbling barrel which is suitable for use in any
and all of the above mentioned arts, which com
bines unusual‘economy in construction, durabil
ity, immunity from corroding leffects of acid and
alkali, which by its strength allows a greaterA 20
20 satisfactory for all purposes.
In the plating industry, barrels of this type ~ area for perforations and thereby produces
must be constructed so that the axle is insulated greater economy in electrical current consump
from the rest of the barrel, for the axle and pro
trusions from the axle which contact the work
25 are usually made one pole of the electric current,
the other pole being situated outside the barrel.
In order for the solution and the electric current
to reach the pieces being plated, the sides of the
barrel are perforated.
Ordinary _metals as such, are not suitable for
use in the construction of these barrels as the
work and the axle transmit the current to the
barrel which results in a coating of the deposit
ing metal on the barrel itself. Further, plating
solutions are usually so corrosive that they at
tack the metal causing rapid deterioration and
adding foreign ions to the solution.
Wood has been used for the construction of
plating barrels, but it swells, splits and deteri
40 orates rapidly from the combined action of the
strong chemical solutions and wear from the
pieces being plated tumbling constantly inside.
Because of the relative fragility of wood, the per
forations in the sides- which are necessary to per
45 mit the solution to get inside must be so small or
fewer in number than is desired in order for the
sides to bear up under the strain, that a great
deal of electric current is wasted because of the
added resistance in reaching the articles being
Bakelite and hard rubber are insulating ma
terials and are used extensively for the con
struction of plating barrels, but their use also
presents serious disadvantages. These materials
“_ are expensive and being hard and brittle in na
The barrel is constructed of steel or any other
suitable metal and covered with a layer of pliable
rubber. The rubber may be applied in any de
sired manner preferably making use of rubber
compounded in a liquid form, »for example by
spraying or dipping. A fairly thin coat is all
that is necessary to produce the desired result,
but varying considerably with the use to which
it is put.
The attached drawings illustrate an example
of a plating barrel constructed in accordance
with this invention. Figure l is a sectional view
of a tank in which is contained the plating solu
tion, showing the position of a barrel suspended
therein. Figure 2 is an elevation o_f the finished
barrel. Figure 3 shows a cross section through
the finished barrel indicated at 3_3 in Figure 2.
Figure 4 is a longitudinal section through the
finished barrel taken from 4_4 in Figure 3.
Figure 5 shows an enlarged section taken from
5_5 in Figure 4, and shows rubber covering on
the expanded metal. Figure 6 shows a frag 45
mentary sketch of a modification of the inven
tion comprising a rubber coating on a perforated
steel plate in place of the expanded metal. Fig
ure 'l shows a modification in the drum head as
sembly ln a sectional view.
In the drawings attached, number I indicates
expanded metal, 2 is the pliable rubber coating,
3 the perforations which extend through the rub
ber, number 4 indicates the tank in which is con
tained the plating solution and in which is sus 56
pended the barrel, while l is insulation between
the tank and the brackets from. which is sus'
’I'he rubber covering is most practicably ap
plied by dipping or spraying processes, using rub
pended the barrel. Number i points out the
ratch‘et gear which is fastened securely to the
head of the barrel, and number 1 indicates the
ber compounded in liquid form, but it is under
stood that the various methods of applying »rub
' assembly for transmitting power to the ratchet
gear and thereby tumbles the whole barrel over
and over. Number 8 shows a suggested bracket
from which to suspend the barrel which allowsv
10 it to tumble without binding the axle ends. Num
ber 9 indicates that the positive pole of the elec
tric current is connected to the tank although
it may be connected to anodes placed in the so
lution outside the barrel. The negative pole,
15 as indicated by number I0 is connected to thev
bracket which carries the axle thus making the
axle the negative pole, being transmitted to the
work being plated by the danglers which are at
tached to the axle. The axle is rubber coated
20 completely‘except where danglers make contact
and where it rests in the brackets. Number II
_ shows the metal axle upon which the barrel
is assembled.
In barrels which are not to be
used with electric current, the axle need not ex
25 tend the entireflength of the barrel, but may be
just a short piece fastened securely in the mid- ,\ '
die of the outside of each end piece. Number I2y
illustrates a type of dangler which may be used;
it is fastened to and keeps constant contact with
the axle but is loose enough so that the dangler
does not turn over with the axle and the rest of
the barrel, so that it is allowed to mingle with
iljiier to metal are within the spirit of this inven
The figures attached serve to illustrate one
workable subject of this invention, but it is un
derstood that the invention anticipates any type,
design, size or shape of barrel constructed ofr 10
metal, insulated with pliable rubber and used
with plating, pickling, alkali cleaning or rust
prooflng solutions.
The metal base construction is perfectly insu
lated from the electric current and/or from cor
roding effects of the strong chemical solutions.
The insulation is pliable and therefore will not
crack, and the combination will not swell or cor
The pliable rubber coating is extremely
resistant to wear.
Barrels made in accordance with this inven
tion have a longer useful life than the bakelite
composition, and hard rubber barrels of the prior
art, and are considerably less vexpensive to build.
In addition, when the rubber coating does
finally wear oil', the cost of recoating the barrel
is small yet has the practical effect of producing
a new barrel. The old type barrel requires com
plete replacement. 'I'his feature along with
Wasted power, in the case of the old type barrels,
Íidds appreciably to the cost of plating or clean
the pieces being plated and transmit the nega
It is understood that the above detailed de
tive charge to the work. Number I3 shows a rub
ber covered metal angle which runs the full length
of the barrel and assists in exposing new sur
of the many ways in which this invention may
be put into commercial use and that the scope
scription is submitted as an illustration of one
faces to the action pf the solution during its
tumbling action by jutting up inside the barrel
and keeping the work from merely slipping around
the inside. The angle is held in place by rivets
of the invention is to be determined and limited
only by the appending claims.
numbered I'I, or it may be welded or bolted.
Number I4 indicates a removable section of the
binatlon a shaft, a tumbling barrel carried by said
side wall which is used for loading and unload
ing the barrel >with small metal pieces to be
plated. The cover or removable piece of side
wall is securely held in place along one side by
lapping under the edges of the barrel, at the
ends by overlapping the frame, and along the
other side by bolts (I5) and wing nuts (I5) . The
ratchet gear is securely fastened to the head of
the barrel by nuts and boltsnumbered I8.
'I‘his particular barrel is constructed in three
principal parts; the axle is welded to one end,
the sides in a cylindrical shape are then slipped
on fitting snugly to the head welded on the axle,
then the other end having the ratchet fastened
‘securely to it is slipped on to the axle, fitting
snugly up against the open end of the side piece.
What I claim is:
-~ 1. Electropiating apparatus including in com.
shaft, said barrel comprising a pair of generally
-circular sheet metal, rubber covered heads, the
rubber covering of at least one of said heads be
ing interposed between the metallic portion of
saidvhead and said shaft whereby to insulate the
metallic portion of said head with respect to said
shaft, and a generally cylindrical metallic body
portion for said barrel having openings there
through, said body portion being entirely cov
ered with rubber, said rubber being interposed 50
between said metallic body portion and said heads
whereby to insulate said heads with respect to the
metallic body portion of said barrel.
2. Electroplating apparatus including in combi
nation a shaft, a tumbling barrel carried by said
shaft, said barrel comprising a pair of generally
circular sheet metal, rubber covered heads, the
Next a rubber covered metal washer (2|) is
rubber covering of at least one of said heads being
slipped over the axle and a wedge pin (I9) is
placed in a slot through the axle holding the com
interposed between the metallic portion thereof 60
and said shaft whereby to insulate the metallic
plete barrel firmly together.
portion of said head from said shaft and a gen
The load is put
into the barrel thru the opening in the side Wall,
the cover (I4) is then put in place and the wing
nuts screwed down over washers (22).'
Number 20 indicates a modification in the use
of a metal plate through which holes have been
drilled or stamped and then the whole covered
>with rubber to be used in place of expanded
70 metal.
A still further modification is to use
woven metal in place of the expanded metal.
erally cylindrical body portion for said barrel
formed of sheet metal having openings there
through and entirely covered with rubber, the
rubber covering of said body portion being inter 65
posed between the metallic portion of said body
and said heads whereby to insulate the connec
tion between said body portion and said heads.
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