Device and method for testing the leak-tightness of a timepiece case

A technology for shells and electronic watches, applied in clocks and clocks, by detecting the appearance of fluid at the leak point, etc., can solve problems such as measurement errors, and achieve the effect of saving space, saving component costs and assembly time

Inactive Publication Date: 2005-09-28
ASULAB SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Finally, measurements made by such devices can be erroneous since changes in ambient pressure can affect the pressure of the air inside the case

Method used

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  • Device and method for testing the leak-tightness of a timepiece case
  • Device and method for testing the leak-tightness of a timepiece case
  • Device and method for testing the leak-tightness of a timepiece case

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Embodiment Construction

[0024] The invention stems from the general inventive idea of ​​measuring changes in the concentration of a gas in an atmosphere contained within a watch case. Once a decrease in gas concentration is detected, an alarm is generated to alert the wearer of the watch that the water resistance of the watch is defective. Compared to the known solutions of the prior art which mainly create an overpressure inside the watch case and monitor any reduction in this overpressure, the main advantage of the invention is that it does not create a triggering threshold only when the monitored parameter reaches a trigger threshold The only type of system that provides information only at this time, the present invention, on the contrary, provides a very sensitive system that alerts the wearer of the watch as soon as the watch begins to show signs of reduced water resistance. Furthermore, the system according to the invention measures a relative value rather than an absolute value. Therefore, i...

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PUM

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Abstract

The invention relates to a device for testing the leak-tightness of a case (2) belonging to an electronic timepiece (1) comprising a time base (42) which is used to produce a standard frequency signal and a central processing unit (44) which is used to determine the time from said standard signal. The invention is characterised in that it comprises an electronic sensor (32) which can measure fluctuations in the concentration of an atmospheric gas confined in the case (2). According to the invention, the results of the measurement taken by the electronic sensor (32) are processed by the central processing unit (44) which, if necessary, emits an audible or visible alarm in response to the measurement signal.

Description

technical field [0001] The invention relates to a device for ensuring that a timepiece case is watertight or sealed against the outside world. The invention also relates to a method for checking the water resistance or tightness of such watch cases. technical background [0002] It has been proposed to make the pressure inside the watch case greater than atmospheric pressure to prevent the penetration of water, steam, gas or dust into the watch case by an external pressure higher than the inside pressure of the watch case (Swiss Patent No. 312740). Therefore, the watch case has a valve into which an inert gas can be pressed at 1.1 to 1.5 times the atmospheric pressure, and a pressure gauge that allows the wearer of the watch to know the pressure inside the case. [0003] However, the manometer is a complex, precise and expensive instrument, and like the movement, the manometer is susceptible to damage if the sealing device of the watch case fails, which greatly increases th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04G99/00G01M3/20G04B37/08G04C3/00G04D7/00
CPCG04D7/007G04D7/00
Inventor F·盖斯萨斯
Owner ASULAB SA
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