close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3058912

код для вставки
Oct. 16, 1962
E. o. NEILSON
3,058,902
PRECIOUS METAL PLATING BARREL
Filed April 24, l
%
2 Sheets-Sheet 1
Oct. 16, 1962
E, o, NElLSON ’
3,058,902
PRECIOUS METAL PLATING BARREL
Filed April 24’ 1961
2 Sheets-Sheet 2
.106 64
jg
$.
92 'y/94/
7
‘
‘7/95
INVEN TOR.
grates Patent
1
3,058,902
PRECIOUS METAL PLATING BARREL
Elmer 0. Neilson, North Lake, 111., assignor to Mercil
Plating Equipment Company, Chicago, 111., a corpora
tion of Illinois
Filed Apr. 24, 1961, Ser. No. 105,063
5 Claims. (Cl. 204-213)
the
3,%58,002
Patented Oct. 16, 1962
2
FIG. 5 is an enlarged view taken along the line 5-5
of FIG. 2;
FIG. 6 is a perspective view of a contact member for
use on an intermediate rib;
FIG. 7 is a perspective view of a contact member for
use on a rib adjacent the removable panel;
FIG. 8 is an end elevational view in cross-section show
ing schematically the accumulation of parts on one of
the ribs adjacent the removable panel; and
This invention relates generally to electroplating ap
FIG. 9 is a showing similar to FIG. 8 but illustrating
paratus and especially to apparatus for bulk electro 10
plating from precious metal solutions.
The demand for electroplated coatings of precious
discharge of the accumulated parts.
Referring now in detail to the drawings, speci?cally
solutions. However, difficulties have been encountered
heads 22 and 24 being spaced apart and rotatably
mounted respectively to upright standards 26 and 23'.
to FIGS. 1 and 2, a miniature electroplating barrel ap
metals has been extended from jewelry to precision screw
paratus of the portable type is indicated generally by
machine products and electronic components. A con
comitant interest has developed in miniature plating bar 15 the numeral 20. The barrel apparatus 20 will be seen
to include a live end ?ange assembly or barrel head 22
rels that can be used in electroplating small, precision
and a drive end ?ange assembly or barrel head 24, the
parts in bulk with minimal employ of the precious metal
in using electroplating barrels of conventional design.
The small, delicate parts are frequently vdistorted or dam 20 At their lower extremities, the standards 26 and 28‘ are
advantageously fashioned to terminate in feet 30 in order
aged in processing; and adequate electrical contact with
that the barrel apparatus 20 can be free-standing when
the parts has been di?icult to maintain. Reduced barrel
placed on a generally horizontal surface. Hanger brackets
speeds have been required to minimize these problems.
32, each comprising a horizontal arm 34 having hook
Low and costly production rates have resulted.
25 members 36 at each end, are af?Xed to the standards
An important object of the present invention is, there
26 and 28 in a location generally vertically above the
fore, to provide apparatus that is highly adapted to the
heads 22 and 24-. The hook members 36 extend laterally
bulk electroplating of small, delicate parts.
beyond the standards 26 and 28 for supporting the barrel
Another object of the invention is to provide electro
20 in an electroplating tank.
plating apparatus that avoids abuse of the charged parts. 30 apparatus
The heads 22 and 24 are joined by interconnecting ribs,
Yet another object of the invention is to provide a new
in particular, ‘a pair of ribs 38 adjacent a removable panel
and improved contact for electroplating barrels.
40 and a suf?cient number of intermediate ribs 42 to
And yet another object of the invention is to provide
provide
a strong barrel framework. The lateral space
a contact for electroplating barrels that is easily removed
between the ribs 38 is closed oif by a removable panel
for cleaning.
35 40 which is fashioned with tapered lateral edges these
A further object of the invention is to provide an elec
lateral edges cooperatively seat against the ribs 38. The
troplating barrel that can be operated at normal speeds
panel 40 is also provided with a handle 44- and a clamp
with safety to a charge of small, delicate parts.
element 46.
A still further object of the invention is to provide an
The other lateral spaces between the ‘several ribs are
electroplating barrel from which parts are easily dis
closed oil with panels 48; and as will be noted with refer
charged.
ence to FIG. 2, the ribs 38 and 42 are provided with
And a still further object of the invention is to pro
elongated, longitudinal slots or grooves 5% ?aring out
vide an electroplating barrel structure that prevents lodg
wardly from the sides of the rib to receive the edges of
ing of mechanically aggregated parts.
Additional objects and features of the invention pertain 45 the panels 48. The panels 40 and 43 are advantageously
fashioned from a chemically resistant material such ‘as
to the particular structure and arrangements whereby the
molded or extruded methyl methacrylate resin and are
above objects are attained.
perforated with numerous small holes 52 in order to
A structure in accord with the invention includes a
pair of barrel heads arranged to be rotated in spaced
relationship, one of the heads being electrically insula
tive and having an electrically conductive element
therein; ribs ?xed between the heads at arcuately spaced
locations; perforated panels between adjacent ribs; and
a massive contact rod ?xed to each of the ribs internally
of the perforated panels, each of the contact rods being
electrically connected to the conductive element in the
one head, the rods exposing a substantial area to the parts
charged into the barrel.
The invention, both to its structure and mode of op
eration, ‘will be better understood by reference to the
following disclosure and drawings forming a part there
of, wherein:
FIG. 1 is a perspective view of an electroplating barrel
constructed in accordance with the invention;
FIG. 2 is an enlarged, end elevational view in cross
section of the electroplating barrel of FIG. 1;
FIG. 3 is an enlarged, cross-sectional view of a con
tact-mounting rib for use adjacent the removable panel
of the electroplating barrel of the invention;
FIG. 4 is a view similar to the showing of FIG. 3 but
illustrating an intermediate rib;
allow free circulation of the electroplating ?uids through
the barrel. The holes 52 must be small enough to reject
the parts being processed; and in one speci?c embodi
ment, holes 52 have been fashioned approximately 1/32
inch in diameter.
For purposes of rotating the electroplating barrel proper
and thereby tumbling the parts charged into it, the drive
head 24 is attached to a spur gear 54- which is arranged with
its axis coincident with the axis of rotation of the barrel
20. An electric motor 56 or other suitable drive means
is supported on a horizontal panel 58 that extends between
the standards 26 and 28 above the barrel proper. A
pinion gear 60 is mounted on the output shaft 62 of
motor 56 to mesh with spur gear 54 applying motive force
to the barrel proper.
Turning now to FIG. 5, the ribs 38 and 42 will be
seen secured to the head-s 22 and 24 by mounting screws
64 which threadedly engage the ends of the ribs. Ad
vantageously, the heads of the mounting screws 64 are
protected from the electroplating solutions by plugs 66
which threadedly engage the sidewalls of counterbores
formed in heads 22 and 24. If desired, the plugs 66 may
be secured in place using an appropriate adhesive or
cement.
3,058,902
Continuing with reference to FIG. 5, the live end ?ange
assembly or head 22 will be seen to include an inside
plate 68 and an outside plate 70 which sandwich there
between and electrically conductive spider 72, plates 68
and 70 being fashioned from a chemically resistant, elec
trically insulative material such as polymerized methyl
methacrylate resin. The spider 72 is shown in phantom
side elevation in FIG. 2; and returning to FIG. 5, the head
22 is shown rotatably mounted to the standard 26 by
4
contact element in intimate engagement. The longitudi
nally extending grooves ‘114 open into the interior of the
barrel and, accordingly, ‘are situated between the grooves
50 which receive the side panels of the barrel. It will be
noted that the ribs are fashioned with sloping lands 116
between the groove 50 and the groove 114. These lands
116 communicate with the contact elements at an angle
approaching the tangential in order to prevent lodging of
mechanically aggregated parts in the vicinity’ of the con
means of a journal unit indicated generally by the nu 10 tact elements. As the barrel rotates during an actual
meral 74, unit 74 being arranged to make electrical con
electroplating operation, the small parts charged into the
nection to the spider 72 while excluding electroplating
barrel cascade; and the generally pyramidal structure de
solutions.
'
?ned ‘by each of the contact elements and its correspond
The journal unit 74 includes an elongated bronze bush
ing rib does not form a pocket with the adjacent panels
ing 76 which enters a central bore formed in the head 22. 15 which would tend to collect such parts.
A nickel trunnion 78 is ?xed to the standard 26 by a
In accordance with a further feature of the invention,
?ange 80 and screws 82, bushing 76 rotatably receiving
the contact elements 102 which are disposed adjacent the
the trunnion 78. The trunnion 78 is connected to an elec
removable panel '40 are provided with a longitudinally
trical lead 84 while the ?ange 80 is covered with ‘an in
extending ?at surface 118; and with reference to FIG.
sulation plate 86 preferably fabricated from polymerized
2, the planes of the ?at surfaces 118 will be seen to
methyl methacrylate resin. Advantageously, a quantity
intersect in the general vicinity of the removable panel
of the resin is polymerized in place about the connection
40. So arranging the contact elements 102 facilitates
discharge of parts from the barrel upon completion of the
88 ?lling the central aperture in the plate 86.
electroplating operation; and turning to FIGS. 8 and 9,
A sleeve 90, preferably fabricated from a melamine 25 the panel 40 will be seen removed from the gate of the
resin-linen laminate is interposed between ?ange 80 and
barrel and the majority of the charged parts removed
between lead 34 and trunnion 73 to form a resinous plug
the bushing 76, sleeve 90 being of approximately the
by manually rotating the barrel. A certain portion of
same internal and external diameters as bushing 76.
A plate 92 is ?xed with respect to the standard 26 sur
the parts collected on the ?at surface 118 are shown by
fastened to head 22 by means such as the screws 96, plate
as is shown in FIG. 9.
the numeral 120. Slight rotation of the barrel in the
rounding the sleeve 90, and a ‘cooperating plate 94 is 30 direction indicated by arrow 122 will dump these parts
94 bearingly engaging the plate 92. A sleeve bearing 98
enters communicating bores in the plates 92 and 94
overlapping the juncture between bushing 76 and sleeve
'
With reference to FIGS. 6 and 7, it will be noted that
the contact elements 102 and 104 have an inclined sur
face 124 formed at the free ends thereof. As is shown
90, whereas an annular washer element 100 is a?ixed to 35 in FIG. 5, this inclined surface 124 makes an obtuse
plate 70 in a circular recms formed in plate 94, washer
vangle with the unoccupied length of the corresponding
100 confronting one end of the sleeve bearing 98.
rib. This arrangement furthers free movement of the
It is to be noted that electrical supply flows from the
parts during rotation of the barrel in the course of the
lead 84 to the trunnion 78 and to the bushing 76. From
electroplating operation.
,
there, it ?ows to the spider 72; and it will be observed 40
With continued reference to FIG. 5, it will be observed
that the ends of the arms of the spider 72 are coupled
that the ends of spider 72 stop short of the rib mounting
to either a contact element 102 or a contact element 104.
screws,64. This advantageous arrangement has proved
useful in minimizing the electrical insulation problem
and in preventing buildup of plated metal in minute in
Each of the contact elements is provided with a necked
down end 106 which enters a cylindrical bore 108 in the
plate 68 to abut the spider 72. Screws 110 threadedly
engage the contact elements, drawing the contact elements
in place against the spider 72. Desirably, plugs 112 are
terstices between the several elements of the barrel. The
use of rod-type conductive members, such as the contact
elements 102 and 104, has been found to permit this ar
rangement.
seated in counterbores over the heads of screws 110 sim
ilarly to the use and application of plugs 66 described
hereinabove. If desired, additional screw-type fasteners
can be used penetrating the ribs radially and engaging
the contact elements for additional secural.
. In accordance with ‘an important feature of the inven
tion the contact elements 102 and 104 expose a substan
Operation of the barrel apparatus 20 will be apparent
50
from the foregoing descriptions.
It is anticipated that electroplating apparatus con
structed in accordance with the present invention will ?nd
wide ?elds of utility in the plating of zinc, copper, cadmi
um, brass and other less expensive metals as well as in
tial surface to the parts charged into the barrel 20. 55 the plating of precious metals.
Accordingly, the elements 102 and 104 are selected to
The speci?c example, herein shown and described
be relatively massive parts which extend an appreciable
distance along the corresponding ribs.
With reference
should be considered illustrative only. Various changes
in structure will, no double, occur to those skilled in the
to FIG. 5, it will be observed that a contact element ‘104
extends from the head 22 to within ashort distance “d” 60 art; and these changes are to be understood as forming a
part of this invention insofar as they fall Within the spirit
of the head 24. The spacing provided by the distance
and scope of the appended claims.
“d” permitting su?icient axial shifting of the contact ele
The invention is claimed as follows:
ment for disengaging‘the necked-down portion 106 from
1. An electroplating barrel comprising: a pair of bar
rel heads arranged to be rotated in spaced relationship;
65 a plurality, of ribs ?xed between said heads at arcuately
The elements 102 and 104 have been fashioned from
spaced locations, each of said ribs having a longitudinal,
numerous electrically conductive materials, yellow brass
contact member-receiving groove opening into the in
having proved eminently useful in this regard. The ele
terior
of said barrel and having lands at the opposite
ments 102 and 104 also have fashioned in a variety of
lateral edges of said groove; perforated panels between
cross-sectional shapes, a circular or round cross-sectional
adjacent ribs, including a removable panel; a massive
shape being shown in the several ?gures.
elongated
contact member affixed to each of said ribs in
7 It has proved advantageous to mount the contact ele
the groove thereof, each of said members exposing a sub
ments to the barrel ribs employing an appropriately shaped
stantial area to theparts charged into the barrel, the
groove;,and as will be seen in FIGS. 3 and 4, grooves
members
adjacent said removable panel being formed
114 have a curved floor for receiving the corresponding 75
a the bore 108, as would be desired in removing the contact
element for cleaning.
,
with a longitudinally extending ?at surface, the planes of
3,058,902
5
6
joining said heads, a plurality of said ribs being each
fashioned with a longitudinal, conductive member-re
ceiving groove opening into the interior of said barrel,
panel-receiving grooves spaced laterally from said con
ductive member-receiving groove and lands ‘between said
conductive member-receiving groove and said panel
receiving grooves; fenestrated panels having edges re
ceived in the panel-receiving grooves of adjacent ribs;
said ?at surfaces intersecting in the region of said remov
able panel and the lands which are adjacent said last men
tioned members at the edges thereof away from said
removable panel ‘being arranged to de?ne convex sur
faces, said convex surfaces cooperating with said ?at sur
faces to expel small parts from said barrel upon removal
of said removable panel and upon rotation of said barrel.
2. An electroplating barrel comprising: a pair of bar
and an elongated conductive member in each of said con
rel heads arranged to be rotated in spaced relationship.
ductive member-receiving grooves exposing a substantial
10
one of said heads being electrically insulative and having
surface to parts charged into said barrel, said conductive
an electrically conductive element therein; a plurality of
member cooperating wtih the corresponding rib in de?n
ribs ?xed between said heads; perforated panels between
ing a pyramidal structural between adjacent panels.
adjacent ribs; and a massive contact rod ?xed to each of
5. An electroplating barrel comprising: two barrel
said ribs, each of said rods exposing a substantial area to
heads arranged to be rotated in spaced relationship; ribs
15
the parts charged into the barrel, said rods being of lesser
joining said heads, a plurality of said ribs being each
length than said ribs whereby to de?ne a free end away
fashioned with a longitudinal, conductive member-receiv
from said conductive element, said free end having an
ing groove opening into the interior of said ‘barrel, panel
inclined surface.
receiving grooves spaced laterally from said conductive
3. An electroplating barrel comprising: a pair of bar
member-receiving groove and sloping lands between said
rel heads arranged to be rotated in spaced relationship,
conductive member-receiving groove and said panel-re
one of said heads being electrically insulative and having
ceiving grooves; fenestrated panels having edges received
an electrically conductive element therein; a plurality of
in the pnael-receiving grooves of adjacent ribs; and an
ribs ?xed between said heads radially outwardly of said
elongated conductive member in each of said ‘conductive
conductive element, each of said ribs having a contact
member-receiving grooves exposing a substantial surface
25
mounting surface facing the interior of said barrel;
to parts charged into said barrel, said lands forming wide
perforated panels between adjacent ribs disposed radially
angles with the juxtaposed panels and with the juxtaposed
outwardly of said contact-mounting surface; a contact
conductive members whereby to release said parts upon
rod ?xed to each of said ribs at the contact-mounting
rotation of said barrel.
surface thereof in electrical connection with said con
30
ductive element, each of said ribs exposing a substantial
References Cited in the ?le of this patent
area to the parts charged into said barrel, said rods being
UNITED STATES PATENTS
of lesser length than said ribs whereby to de?ne a free
Taylor et al ___________ _._ Apr. 26, 1921
end away from said conductive element, said free end
1,376,052
Slattery _____________ __ June 30, 1925
having an inclined surface making an obtuse angle with
1,544,188
Potthoff ____________ __ Mar. 30, 1943
the unoccupied length of said contact-mounting surface. 35
4. An electroplating barrel comprising: two barrel
heads arranged to be rotated in spaced relationship; ribs
2,315,272
Документ
Категория
Без категории
Просмотров
0
Размер файла
615 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа