Патент USA US3052093код для вставки
Sept. 4, 1962 E. PIQUEREZ 3,052,083 WATERPROOF WATCHCASE WITH MOISTURE INDICATOR Filed Dec. 20, 1954 United States Patent 0 "ice 1 3,052,083 WATERPROOF WATCHCASE WITH MOISTURE INDHCATOR 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) 3,052,083 Patented Sept. 4, 1962 2 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 occurred; 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 that 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 UNITED STATES PATENTS 2b of the disc, the color of which has not varied the 50 1,826,115 Ziebarth ______________ __ Oct. 6, 1931 moisture. Thus the disc 2 allows checking the water 2,446,361 Clibbon ______________ __ Aug. 3, 1948 tightness of the case. 2,609,655 Vermot ______________ __ Sept. 9, 1952 In the second embodiment of the invention, as per 2,621,468 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 FOREIGN PATENTS applied to the central part 4a and the annular part 4b 10,565 Switzerland __________ __ July 12, 1895 of the disc as above to 2a and 2b respectively, and the 284,120 Great Britain __________ __ Jan. 26, 1928 color, when the watchcase is dry, is the same on 4a as 393,094 Great Britain __________ __ June 1, 1933 on the periphery 4b. Again the substance in the central 215,706 Switzerland ___________ _.. Oct. 16, 1941 part 4a of the disc gets darker when the air in the watch 60 247,044 Switzerland ___________ __ Nov. 1, 1947 case is moist and the substance in annular part 4b does 58,753 France __________ __'____ Nov. 25, 1953 not change color.