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Патент USA US3052093

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Sept. 4, 1962
Filed Dec. 20, 1954
United States Patent 0 "ice
Ervin Piquerez, Bassecourt, Bern, Switzerland
Filed Dec. 20, 1954, Ser. No. 476,448
Claims priority, application Switzerland Dec. 22, 1953
1 Claim. (Cl. 58-88)
Patented Sept. 4, 1962
Evidently it is also possible to apply the substances di
rectly onto the dial plate, the color being uniform when
the air is dry. In FIGS. 5 and 6 the watch comprises
a glass cap 5 and a tablet 6, made of porous porcelain im
pregnated with chloride of cobalt. The tablet is set in a
metallic ring 7 which is fixed with glue or by pressing to
the inner central face of the glass cap.
It is a matter of experience that when a waterproof
watchcase construction has a leak—for instance after a
This invention relates to a watchcase construction and
more particularly to a watchcase construction incorporat 10 long stay in water—the water that has got through
accumulates in the joints of the case. The latter is
ing waterproof features.
warmed by coming into contact with the skin or lying in
According to the main or principal object of this in
vention, the watchcase ‘of the above construction con
the sun, and the water changes into steam that settles in
tains a substance the color of which varies according to
the shape of droplets under the central section of the
and arrangement of parts, which will be hereinafter de
scribed and speci?cally pointed out in the claim.
Referring to the drawing which forms a part of the
speci?cation, FIG. 1 is a face view of a wrist watchease
the inside of which is assumed to be dry;
other part inside the case. The embodiment illustrated
in FIGS. 7 and 8, differs from FIGS. 5 and 6, only in the
?xing of the tablet 8, without the help of a ring, to a sup
dial underneath the glass cap and is rigidly secured at each
end to the periphery of said cap. The frame may also be
secured to the inner side of the glass cap to the case body
or to the dial plate.
What I claim is:
humidity content inside the case whereby the ?uidtight 15 glass cap because glass not being such a good conductor
of heat as metal is, remains colder for a longer time.
ness of said case may be readily checked.
On the other hand the central part of the glass cap is
A further object is to prevent any small quantity of
where the substances can most easily ‘be seen Without
water penetrating the watchcase from acting upon the
interfering with the reading of time since it covers only
gearing or any other part of the movement, before the
the central part of the hands. When an appropriate
watch has been controlled and restored to its original
color changing substance is used, this can also absorb
Waterproof condition. To this purpose the substance used
completely a small quantity of moisture entering the case;
is meant to absorb completely a small quantity of water.
thus allowing a checking of the watertightness of the
With these and other objects not speci?cally mentioned,
watch before water starts acting upon the gearing or any
in view, the invention consists in certain combinations
porting frame 9‘, possibly made of a transparent synthetic
material such as that sold under the registered trademark
FIG. 2 is the same view as FIG. 1, after a leakage has 30 “Plexiglas.” The frame 9 extends diametrically across the
FIGS. 3 and 4 are views similar to the preceding ones,
but covering a second embodiment of the invention;
FIGS. 5 and 6 are respectively a side section and a face
of a third embodiment, FIG. 5 being a cross-section
through line V—V of FIG. 6;
FIGS. 7 and 8 are views similar to FIGS. 5 and 6,
but covering a fourth embodiment, FIG. 7 being a cross
section through line VII—VII of FIG. 8.
FIGS. 1 and 2 illustrate a watchcase 1 with a card
In a waterproof watch comprising a case, a movement
located in the case, a dial plate secured to said case and
a glass cap fluidtightly ?tted to the case over the dial
plate at a small distance therefrom, the combination of
a support extending diametrically across the underside of
the glass cap and rigidly secured at each end to the
periphery of said cap, a moisture detecting layer of a sub
stance the color of which changes in contact with any
moisture entering the space between the cap and the dial
lboard disc 2 ?xed to the bottom. A substance changing
color with the moisture content of the air is applied to the
central part 2a of the disc and a substance which does not
change color in the presence of moisture is applied to
the annular part 2b of the disc. The color of the disc 45 plate, said layer being carried by said support on the side
facing the glass cap to be visible through the latter.
surface is uniform as shown in FIG. 1 when the air in
side the watchcase is dry. If the air gets moist the central
References Cited in the ?le of this patent
part 2a becomes darker and the change in color is easily
noticeable because of the contrast with the annular zone
2b of the disc, the color of which has not varied the 50
Ziebarth ______________ __ Oct. 6, 1931
moisture. Thus the disc 2 allows checking the water
Clibbon ______________ __ Aug. 3, 1948
tightness of the case.
Vermot ______________ __ Sept. 9, 1952
In the second embodiment of the invention, as per
Colomb ______________ __ Dec. 16, 1952
FIGS. 3 and 4, a disc 4 is applied to the dial plate 3 of
the movement. The same substances are respectively
applied to the central part 4a and the annular part 4b
Switzerland __________ __ July 12, 1895
of the disc as above to 2a and 2b respectively, and the
Great Britain __________ __ Jan. 26, 1928
color, when the watchcase is dry, is the same on 4a as
Great Britain __________ __ June 1, 1933
on the periphery 4b. Again the substance in the central
Switzerland ___________ _.. Oct. 16, 1941
part 4a of the disc gets darker when the air in the watch 60
Switzerland ___________ __ Nov. 1, 1947
case is moist and the substance in annular part 4b does
France __________ __'____ Nov. 25, 1953
not change color.
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