U.S. patent number 3,861,990 [Application Number 05/344,388] was granted by the patent office on 1975-01-21 for exterior parts for a timepiece.
This patent grant is currently assigned to Kabushiki Kaisha Suwa Seikosha. Invention is credited to Toshio Imai, Masami Kasai.
United States Patent |
3,861,990 |
Kasai , et al. |
January 21, 1975 |
EXTERIOR PARTS FOR A TIMEPIECE
Abstract
Artifacts are prepared by reducing rocks, minerals, seashells
and pigments to powders, distributing said powders in patterns,
either mixed or unmixed, and binding said powders together as by
sintering or the use of adhesives. Preferred artifacts are exterior
components of watches.
Inventors: |
Kasai; Masami (Suwa,
JA), Imai; Toshio (Okaya, JA) |
Assignee: |
Kabushiki Kaisha Suwa Seikosha
(Tokyo, JA)
|
Family
ID: |
27287020 |
Appl.
No.: |
05/344,388 |
Filed: |
March 23, 1973 |
Foreign Application Priority Data
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|
|
|
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Mar 27, 1972 [JA] |
|
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47-30583 |
Apr 6, 1972 [JA] |
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47-33838 |
Apr 21, 1972 [JA] |
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47-40108 |
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Current U.S.
Class: |
428/543; 368/280;
428/49; 428/323; 428/542.8; 968/366; 63/36; 29/896.43;
29/896.33 |
Current CPC
Class: |
G04B
37/225 (20130101); Y10T 428/25 (20150115); Y10T
29/49597 (20150115); Y10T 428/8305 (20150401); Y10T
29/49584 (20150115); Y10T 428/166 (20150115) |
Current International
Class: |
G04B
37/00 (20060101); G04B 37/22 (20060101); A44c
015/00 () |
Field of
Search: |
;161/7,18 ;58/91,88G,88R
;29/182.5 ;117/129 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Schulz; William E.
Attorney, Agent or Firm: Blum Moscovitz Friedman &
Kaplan
Claims
What is claimed is:
1. A decorative matrix comprising sintered fines of a naturally
occurring rock material, said matrix being characterized by a
hardness which exceeds that of an integral fragment of said
naturally occurring rock material.
2. The decorative matrix as claimed in claim 1 wherein said fines
of said naturally occurring rock material is selected from the
group consisting of argentite, pyrite, cobalt glance, cuprite,
tenorite, hematite, spinel, fluorite, cryolite, dolomite,
dialogite, malachite, anhydrite, cyanosite, xenotime, apatite,
pyromorphite, ferberite, cupro-scheelite, quartz, ferruginous
quartz, rock crystal, chrysolite, zircon, garnet, epidote, jadeite,
calamite, manganese zeolite, and diorite.
3. The decorative matrix as claimed in claim 1 including an
inorganic pigment randomly dispersed therein.
4. The decorative matrix as claimed in claim 3 wherein said pigment
is selected from the group consisting of precipitated barium
sulfate, alumina white, zinc white, chrome black, silicon carbide,
slate powder, rouge, chromium tin red, yellow lead, zinc chromate,
chromium oxide green, cobalt, chrome green, Prussian blue,
permanent blue and metallic powder pigments.
5. The decorative matrix as claimed in claim 1 including a specific
distribution of shell fines therein.
6. The decorative matrix as claimed in claim 1 wherein said
sintered fines are diorite and said matrix is characterized by a
Vickers hardness of about 750 to about 800 Hv.
7. The decorative matrix as claimed in claim 3 wherein said
sintered fines are andalusite and said inorganic pigment is
zirconium oxide, said matrix being characterized by a Vickers
hardness of about 800 to about 1,000 Hv.
Description
BACKGROUND OF THE INVENTION
A number of materials, both metallic and nonmetallic, are suitable
for use independently in the manufacture of artifacts which may be
subjected to corrosion and abrasion. Such materials may be either
metallic or nonmetallic and include, as examples, plastics,
stainless steel and ultra-hard alloys. Conditions are particularly
severe where such materials are used in watchcase components, where
they are subjected to corrosion and to abrasion. Those materials
which do not have the necessary hardness and abrasion resistance or
which are not attractive in appearance may undergo surface
treatment such as corrosion-proofing as by electroplating, the
alumite treatment and even coating with a paint. However, paint
itself, while it may be attractive in appearance, is hardly
abrasion resistant. Moreover, the range of materials, whether used
independently or with surface treatment is relatively limited.
In the attempt to please the consumer, there is a continuing effort
to develop designs which are fresh, new, attractive and, in
addition, retain resistance to both corrosion and abrasion. The
effort for fresh, new designs is particularly important where
watchcases are concerned. Such cases continually are subjected to
the corrosive effects of perspiration and frequently come in
contact with abrasive materials such as concrete and cement.
SUMMARY OF THE INVENTION
Hard rock, minerals, seashells and inorganic pigments are first
reduced to fine powders and then arranged in patterns in which the
various powders are either blended or unblended. The powders are
then treated to make the particles adhere to each other. The
treatment may consist of sintering, where the materials can be
raised to a sintering temperature without destruction of the color,
or bonding by the use of adhesives. The pattern may be arranged on
the surface of a base metal to which it is bonded either by
sintering or by the use of an adhesive, or the powders after
bonding may be self-supporting if the item fabricated thereof is
thick enough. Suitable artifacts for the use of such materials are
watchcase components such as a dial, a bezel, an exterior case
body, a coating on an exterior case body, indicia and items of
costume jewelry.
Accordingly, an object of the present invention is the production
of artifacts of improved appearance from minerals, rocks, inorganic
pigments and seashells.
Another object of the present invention is the production of
artifacts such as exterior watch components using minerals, rocks,
seashells and inorganic pigments in powdered form.
An important object of the present invention is to provide
artifacts which are decorative and which are formed of colored
minerals, rocks, inorganic pigments and seashells in powdered form
where the various powders are arranged in decorative and attractive
fashion.
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.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Artifacts, and especially exterior components of watch-cases, are
made from powders derived from a variety of materials. The powders
are bonded together either by use of an adhesive or by sintering.
The powders may be applied to a base metal; if sintering is to be
used as the method of bonding of the powder to itself and to the
base metal, then the base metal must have a higher melting point
than the sintering temperature of the powder or powders used.
Alternatively, the powder or powders may be bonded to the base
metal support by the use of a suitable adhesive. Where the powders
are used in sufficient thickness, components free of any support
may be formed. Again, the method of providing adherence between
particles of powder is by sintering, where appropriate, or by the
use of suitable adhesives.
Where rocks are to be used as the source of powders, the rocks may
be eruptive, sedimentary or metamorphic in origin. Examples are
sulfide minerals and sulfite minerals such as argentite, pyrite and
cobalt glance; oxide minerals and hydroxide minerals such as
cuprite, tenorite, hematite and spinel; halide minerals such as
fluorite and cryolite; carbonate minerals such as dolomite,
dialogite and malachite; sulfate minerals such as anhydrite and
cyanosite; phosphate minerals and arsenate minerals such as
xenotime, apatite and pyromorphite; tungstate minerals and
molybdate minerals such as ferberite and cupro-scheelite; silicic
acid minerals such as quartz, ferruginous quartz and rock crystal;
silicate minerals such as chrysolite, zircon, garnet, epidote,
jadeite, calamite, manganese zeolite and diorite; nitrate minerals
and borate minerals.
The rocks or minerals are reduced to powder by grinding, and if
necessary, ball-milling, after which they may be mixed with a
lubricant in order to facilitate compressing. They are then
compressed and optionally presintered to prepare a preform. They
are then sintered either by themselves or with a suitable binding
material mixed into the powder.
Products made from such rock minerals have high mechanical strength
and may be arranged into a variety of patterns, such as stripes,
spots and designs of unlimited variety. Following is an example of
the preparation of a product in accordance with the present
invention: Diorite, also known as black granite, is pulverized
mechanically and then mixed in a wet ball mill. The powder is dried
and mixed with a small quantity of lubricant such as a paraffin wax
to facilitate compacting in a press. Compacting is carried out in a
die corresponding to the product which it is desired to make. As
aforenoted, the process is particularly applicable for the
manufacture of watchcase exterior components.
The pressure required for preparing a preform is about 2
tons/cm.sup.2. Finally, sintering is carried out for a period of
about an hour at a temperature of 1,350.degree.C.
The product of the above sequence of operations is finally polished
in accordance with conventional processes, taking into account the
hardness of the particular object. In the present case, the object
can be polished to a high luster having a most attractive
appearance. Moreover, the product is extremely hard, so that it is
abrasion resistant and is corrosive resistant as well.
The hardness of an object prepared by sintering diorite is about
750-800 Hv on the Vickers hardness scale. Surprisingly, the
hardness of the sintered object is greater than that of diorite as
found, the hardness of the latter being 500-600 Hv on the Vickers
scale. Moreover, the forming process makes it possible to prepare
objects in a much wider variety of shapes than would be the case
with the stone itself. Also, considering its greater strength,
complex shapes can be made by the powder process. As an example of
the difference in strength between the two types of diorite, a drop
test onto concrete was performed. Watchcases of the sintered
product and of natural black granite (diorite) were dropped from a
height of 1 meter. The case formed of natural black granite broke
at a corner on the very first drop. On the second test, the piece
shattered. In contrast, the case formed of sintered black granite
according to the present invention withstood the drop test 10
times, making it clear that products prepared in accordance with
the present invention may actually be stronger than the natural
product itself.
As aforenoted, powders from a variety of colored rock minerals may
be used together, either blended or unblended, to give a great
variety of patterns. The variety can be further increased by
combining such powders with inorganic pigments. Examples of such
pigments are precipitated barium sulfate, alumina white,
titanolith, zinc white, carbon black, chrome black, silicon
carbide, slate powder, chromium tin red, umber, iron oxide, yellow
lead, zinc chromate, chromium oxide green, cobalt, chrome green,
Prussian blue, permanent blue, manganese purple, deep cobalt and
metallic powder pigments.
Combining rock mineral powders with inorganic pigments results in
an improvement in mechanical strength and density. Moreover, colors
become available which have not hitherto been obtainable by
conventional metalworking surface treatments. It should be noted
that organic pigments are not practical because they are not
resistant to mechanical abrasion, have poor chemical corrosion
resistance and tend to fade when subjected to light. Moreover, they
cannot be sintered.
Following is an example of the use of an inorganic pigment;
Andalusite, one of the silicate materials used as a refractory or
in special procelains, is roughly pulverized, mixed with powdered
zirconium oxide and placed dry in a ball mill. After grinding to
the required degree of fineness, a small quantity of lubricant such
as paraffin is added to facilitate forming in a press. The
composition is formed in a die in the shape of a bezel having an
inside diameter of 30mm, using a pressure of 1.8 ton/cm.sup.2. The
preform is then sintered for one hour at the sintering temperature
of 1,200.degree.C.
The component, namely a bezel, produced in accordance with the
above procedure is then polished in accordance with the usual
techniques. The strength is quite adequate for its projected usage,
namely holding a glass in relation to a watchcase.
The andalusite by itself has a strong red color. In combination
with the zirconium oxide the color is lightened in proportion to
the ratio of the materials used. Consequently, it becomes possible
to achieve any shade of red between a deep red and white by
suitable adjustment of the ratio of the components to each
other.
As a means of producing desirable patterns, various combinations of
andalusite and zirconium oxide, both blended and unblended, may be
arranged in accordance with the desire of the designer to give most
attractive effects. In addition, a bezel, for instance, made by
such a technique has excellent light-resistance and
heat-resistance, as well as corrosion-resistance. Moreover, it is
not easily scratched, since its hardness is between 800 and 1,000
Hv on the Vickers scale. Consequently, such a component satisfies
all of the requirements for an exterior component of a timepiece.
Similarly, it is suitable for many types of artifacts and costume
jewelry. It should be noted that if an attempt were made to fashion
directly from the underground mineral a bezel or an other component
subjected to substantial mechanical stress, the product would not
be nearly so satisfactory as is that made by the process of the
present invention.
In addition to colored rock minerals and inorganic pigments,
artifacts and watch components similar to those described above may
also be made from seashells using somewhat similar techniques. Many
types of shellfish have brilliantly colored shells. In some cases
the shells are permeated with the color, so that the shell has
essentially the same color throughout, and in other cases the
surface color is different from the interior color.
Such shells are readily pulverized to a fine powder and can be used
to produce brilliantly colored artifacts, and especially watchcase
components. Where the composition of a specific shell and the
powder derived therefrom are suitable, the powder may be sintered.
Otherwise, bonding is accomplished by the use of an adhesive.
Suitable shells are those from shellfish belonging to class
polyplacophora, such as subclass paleoloricate, and order
lepidopleurida; class gastropoda, such as order archaeogastropoda,
and order mesogastropoda; class pelecypoda, such as order
dysodonta, and order anomalodesmata; class cephalopoda, such as
subclass tetrabranchia and order nautiloidea; and other class
scaphopoda and class monoplacophora.
Shells are particularly valuable because of the fact that they
provide iridescence. Although they can be blended with any of the
colored rock minerals or inorganic pigments, if it is desired to
use shell-powder in combination with such materials, it is
preferable that they be used side by side rather than mixed.
Otherwise, such iridescence as may be present is lost or diluted.
Following is an example of the procedure used.
The shell of perriere, a red shellfish, has the advantage that the
shell is red both on the exterior and the interior thereof. It is
roughtly pulverized mechanically an then ballmilled dry. A small
quantity of lubricant such as paraffin is added to aid in
press-forming. It is compacted in a die having the shape of an
indicium to be placed on a watch dial, the indicium measuring 4
.times. 1 .times. 1mm. The pressure used is 1.5 ton/cm.sup.2. The
material is then sintered for 45 minutes at a sintering temperature
of 350.degree.C.
After polishing by conventional processes, the indicium is placed
on a dial and cemented thereto. An indicium of the specific
material named is brilliant and appears to glow from within in a
manner similar to that of a ruby or an opal, so that the ornamental
effect is quite striking. The effect is, of course, quite different
from that obtained with a plated metal and is generally considered
far superior in attractiveness. Moreover, whereas the shape of a
piece which can be cut from natural shell is quite limited due to
the limitation in dimension and thickness of the shell itself, by
the use of the powdering process, followed by pressing and
sintering, it becomes possible to make indicia as well as hands and
other components which vary greatly in shape and color. Moreover,
it is extremely difficult to produce the iridescent effect yielded
by artifacts molded from powdered shells and appropriately bonded.
As is apparent, self-supporting components can be made in this
fashion, or components which are relatively thin can be applied as
a coating to base metals or other substrates. Furthermore, it is
possible to use the powdered-shell material in combination with
minerals which require a far higher sintering temperature. For this
purpose, an artifact in which it is planned to use both mineral
powder and shell powder can be made generally as follows:
Assume that the powders are to be applied to a base metal. Sections
to be made of mineral powder are formed by compressing and
sintering at the required high temperature, and sections to be made
of shell powder are formed and sintered at the relatively low
temperature. The parts are then cemented onto the base metal in the
form of a mosaic.
Where no base metal is to be used, the basic structure can be
formed of the rock mineral powder, leaving gaps to be filled in
later with shell powder. The basic structure is formed of the
powder and sintered. The shell powder sections are likewise formed
and sintered, but of course at a lower temperature. The shell
powder components are then cemented into place in the complete
structure.
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 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.
* * * * *