U.S. patent number 3,789,605 [Application Number 05/165,008] was granted by the patent office on 1974-02-05 for gold plated cases for time-keeping instruments.
This patent grant is currently assigned to Kabushiki Kaisha Suwa Seikosha. Invention is credited to Motoki Kishida.
United States Patent |
3,789,605 |
Kishida |
February 5, 1974 |
GOLD PLATED CASES FOR TIME-KEEPING INSTRUMENTS
Abstract
Water proof watches with gold exterior comprise heavily
gold-plated stainless steel case bodies.
Inventors: |
Kishida; Motoki (Okaya,
JA) |
Assignee: |
Kabushiki Kaisha Suwa Seikosha
(Tokyo, JA)
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Family
ID: |
13244697 |
Appl.
No.: |
05/165,008 |
Filed: |
July 22, 1971 |
Foreign Application Priority Data
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Jul 23, 1970 [JA] |
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45-63972 |
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Current U.S.
Class: |
368/280; 368/291;
968/364 |
Current CPC
Class: |
G04B
37/22 (20130101) |
Current International
Class: |
G04B
37/00 (20060101); G04B 37/22 (20060101); G04b
037/00 () |
Field of
Search: |
;58/88R,9R |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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287,618 |
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Dec 1952 |
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CH |
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427,660 |
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Jul 1967 |
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CH |
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Primary Examiner: Miller, Jr.; George H.
Attorney, Agent or Firm: Blum, Moscovitz, Friedman &
Kaplan
Claims
What is claimed is:
1. A water-proof watch comprising a stainless-steel case-body of
one piece construction and a coating of electroplated gold thereon,
wherein said coating extends over the entire exterior of said
case-body
2. A water-proof watch as defined in claim 1, wherein said coating
extends over the entire exterior of said case-body save for the
rear of said case body.
3. A water-proof watch as defined in claim 1, further comprising a
stainless-steel crown and a coating of electroplated gold thereon.
Description
BACKGROUND OF THE INVENTION
Gold exteriors on conventional watches are prepared by gold-plating
brass case bodies or by fitting gold caps to stainless steel case
bodies. Where a gold-plated brass case body is used, removal and
insertion of the watch crystal and the movement results in
scratching and wear of the surface. Furthermore, where the rear
side of the watch case is gold plated on brass, the rear is easily
defaced and is rusted by perspiration during wear. This latter
difficulty has been avoided by affixing a stainless steel back to
the case body by soldering or cementing. However, this method of
handling the problem is not very satisfactory because the cement
gives way eventually and because rust occurs at the solder
joint.
Another method of handling the problem of fixing a gold exterior to
a watch has been to use a gold cap. To assemble the cap and the
case, the cap is first pressed into place and then is essentially
molded around the watch. A multiplicity of molds are required for
the operation and the process requires considerable skill on the
part of the operator as well as subsequent polishing and other hand
operations. A further defect in this method of assembly is that the
cap must be soldered to the stainless steel base. Moreover, where
the case body has a reverse incline or a complex shape, it is very
difficult to assemble the cap to the case. Also, the method cannot
be used where the shape of the cap is complex, as for instance,
when the case is square.
SUMMARY OF THE INVENTION
A case body for a water-proof watch is made of stainless steel and
is heavily gold-plated over the exterior thereof. Such a case uses
no solder and no brass and consequently is free of the problem of
rusting. It also strongly resists abrasion. The back of the case,
in the interest of economy, may be free of gold-plating. The case
body may of one piece or may consist of a plurality of pieces.
The terms "gold-plated," "gold-plating," "gold-plated" and
"plating" as used herein all refer to electroplating with gold.
Accordingly, an object of the present invention is to provide a
water proof watch case having a gold exterior which is free of the
problem of rusting.
Another object of the present invention is to provide a water proof
watch case with gold exterior which may be manufactured
economically.
A further object of the invention is to provide a water proof watch
case with gold exterior which is resistant to abrasion and
scratching.
Still another object of the invention is to provide a water proof
watch case with gold exterior where the watch case may have a
reverse incline or a complex shape difficult or impossible to cover
with a gold cap.
Still other objects and advantages of the invention will in part be
obvious and will in part be apparent from the specification.
The invention accordingly comprises an article of manufacture
possessing the features, properties, and the relation of elements
which will be exemplified in the article hereinafter described, and
the scope of the invention will be indicated in the claims.
BRIEF DESCRIPTION OF THE DRAWING
For a fuller understanding of the invention, reference is had to
the following description taken in connection with the accompanying
drawing, in which:
FIG. 1 is an elevational cross section of a conventional watch
having a gold plated body and a stainless steel back;
FIG. 2 is an elevational cross section of a watch of conventional
construction to which has been fitted a gold cap;
FIG. 3 is an elevational cross section of a gold-plated watch in
accordance with the present invention;
FIG. 4 is an elevational cross section of a gold-plated watch in
accordance with the present invention wherein the rear of the watch
is free of gold;
FIG. 5 is an elevational cross section of a gold-plated watch in
accordance with the present invention showing how the type of watch
normally fitted with a gold cap can be covered with gold plate;
and
FIG. 6 is a cross section of gold-plated watch crown.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the manufacture and in the subsequent repair of conventional
gold-plated watches having a one-piece body, as shown in FIG. 1,
case-body 11 is generally made of brass. The initial insertion and
subsequent removal and replacement of movement 12 as well as of
watch crystal 13 generally result in marring of gold plate 14 due
to the fact that the brass substrate is relatively soft. Also, if
the gold plate extends around the rear of the case, contact with
the wrist and the perspiration thereon eventually result in wearing
away of the gold and rusting of the brass substrate. The
conventional method of handling this problem is to provide a rear
cover 15 of stainless steel. To hold the rear cover 15 in place, it
is either soldered or cemented to the case-body. However, this
solution is hardly satisfactory since the cement frequently fails
or rusting occurs at the soldered joint. Consequently, although
such a water proof, one-piece case construction is in great demand,
and is profitable to manufacture, nevertheless this type of
construction is not widely used.
Another conventional method of providing a water-proof watch case
with a gold exterior is to use a stainless steel case-body 16 as
shown in FIG. 2. Here the body is covered with a gold cap 17. To
assemble this construction, the cap 17 is forced into place by a
press after which it must be polished and pressed into the desired
shape with a spatula. For this operation, a number of molds are
necessary to shape the cap. Then too, hand work is necessary for
sharpening the corners with a spatula and for polishing. Moreover,
solder applied between the base of the stainless steel and the gold
cap becomes discolored. Also, it is virtually impossible to force
the cap around a reverse incline. It frequently happens that the
cap fractures in the operation of application to the stainless
steel body because of the fact that the cap is apt to be of uneven
thickness due to the method of manufacture.
In accordance with the present invention an entire case body 18 is
made of stainless steel. This is covered with a layer of gold plate
19 thick enough to withstand the anticipated wear. As shown in FIG.
3, the layer of gold plate 19 extends around the rear of the case
body.
If desired, the rear of the watch may be covered during the plating
operation so that no gold is deposited thereon. Alternatively, that
portion of the gold plate 19 on the rear of the case body 18 may be
removed mechanically. A watch having no gold on the rear of the
case body 18 is shown in FIG. 4.
A watch having a two-piece case body is shown in elevational cross
section in FIG. 5 where the case body consists of the case itself
16 and a rear portion 21, both parts being made of stainless steel.
The case body construction is identical with that of FIG. 2;
however, as the result of using a plating operation instead of
forcing on a gold cap, it becomes possible to cover surface 22
which has a reverse inclination.
Other external components of a watch may also be gold-plated; this
is illustrated in FIG. 6 showing watch crown 23 coated with gold
plate 24.
As the result of using stainless steel for the case body, a gold
plate deposited thereon shows virtually no abrasion or other
marring caused by contact with the movement or the watch crystal
during assembly or during repair. Furthermore, such a watch can be
worn for long periods without such discoloration as would result
from the presence of solder and without corrosion of the watch from
perspiration of the wearer. In addition, the application of gold by
electroplating rather than as a cap makes it possible to coat
undercut or reversely inclined surfaces.
It will thus be seen that the objects set forth above, among those
made apparent from the preceding description, are efficiently
attained and, since certain changes may be made in the above
article without departing from the spirit and scope of the
invention, it is intended that all matter contained in the above
description and shown in the accompanying drawing shall be
interpreted as illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended
to cover all of the generic and specific features of the invention
herein described, and all statements of the scope of the invention
which, as a matter of language, might be said to fall
therebetween.
* * * * *