Horology: time measuring systems or devices – Cases – With protection means
Patent
1983-07-11
1984-07-10
Roskoski, Bernard
Horology: time measuring systems or devices
Cases
With protection means
368291, G04B 3700
Patent
active
044590393
DESCRIPTION:
BRIEF SUMMARY
Patents CH 608 325 and 609 828 describe electronic wrist watches, the module of which is protected against external influences by a liquid which occupies the inner space of the case. The presence of a liquid in the environment of the electronic module of a wrist watch is known to constitute a protection against shocks, on the one hand, and against oxidation, on the other hand. Another factor which plays a particularly important part and which tends to preserve the operating qualities of an electronic watch when the time-standard of this watch is a quartz is the fact that the liquid also constitutes a protection against the gradual penetration of air into the interior of the capsule of the quartz.
The production of an electronic wrist watch, the module of which bathes in a liquid, poses the problem of the expansion of this liquid in case of increase of the temperature, or more exactly, at the time of a differential variation of the volume of the liquid relative to the volume of the case under the effect of a temperature variation.
The object of the present invention is to provide a new solution better adapted than the known solutions to the requirements of practice, taking into account the specific conditions resulting from the thermal expansion of the liquid.
To this end, the present invention has as its subject an electronic wrist watch comprising a case in at least two parts fixed to one another in a fluid-tight and detachable manner, and an electronic module housed in the case and bathing in a liquid, characterized in that at least one of the said parts of the case is deformable under stress and in that the said liquid is, at the ambient temperature, at a lower pressure than the atmospheric pressure, thus maintaining the said case part in a deformed position.
For casing up, a process may be applied which also forms part of the invention and which is characterized in that the case equipped with the module is placed in a liquid at ambient temperature and at atmospheric pressure, the two parts of the case resting one upon the other by means of annular seats which they both present, the air is exhausted from the case and the latter is filled with liquid, then the whole is subjected to a temperature rise of predetermined value while forces which press them on their seats are exerted on the said parts of the case, after which the whole is returned to the ambient temperature while the said external forces are maintained.
Several embodiments of the watch according to the invention will be described below, by way of example, referring to the figures of the appended drawings,
FIG. 1 is a partial axial sectional view of a first embodiment of the invention;
FIG. 2 is a partial axial sectional view of a second embodiment of the invention; and
FIG. 3 is a top sectional view of a portion of a third embodiment of the invention.
The watch depicted in the drawing comprises an electronic module 1. It is a module of the type having a display with hands which is concerned. It therefore comprises, for example, a stepping motor (not depicted) which drives a wheel-train actuating the moving parts 2 and 3 respectively bearing a minute-hand 4 and an hour-hand 5. These hands move above a dial 6 which is fixed on the module 1. The latter contains a battery (not depicted) which plays the part of a current source. Possibly, a panel may be provided for collecting solar energy. The constitution of this module is of a completely usual type. As a variant, the module 1 might also be replaced by a module of the digital-display type with liquid crystal, with luminescent diodes, with electrochromic elements, or operating according to any other system.
The case depicted in the drawing comprises a first part designated by 7, which is formed by a glass 8 and a caseband 9, and a second part 10 which forms the back of the case. The caseband 9 is cemented along the periphery of the lower face of the glass 8. It is a matter of an arrangement which permits this caseband to be made of a material such as synthetic stone, a ceramic, etc.
The back 10 i
REFERENCES:
patent: 2656674 (1953-10-01), Bondy
patent: 3030763 (1962-04-01), Klingenberg
patent: 3860844 (1975-01-01), Hetzel
patent: 4080781 (1978-03-01), Klingenberg
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