Operating means with seal, for timepiece

Abstract

An operating means such as for example a crown, with an element rigid with the housing and with an operable element which is movable with respect to this. Between these two elements there is arranged a lip seal with an elastic lip, which bears on the element rigid with the housing and delimits the timepiece inner space to the surroundings. By way of the fact that the lip is led in the direction of the surroundings conically onto the element rigid with the housing and lies on this element with pretensioning, on the one hand with an inner space excess pressure it may release itself from the element rigid with the housing for the purpose of pressure compensation between the inner space and the surroundings and on the other hand with a surrounding excess pressure it is more strongly pressed on the element rigid with the housing for the purpose of sealing the inner space with respect to the surroundings.

Description

technical field [0001] The invention relates to an operating device with a seal for a timepiece and a timepiece provided with the device. To seal the operating mechanism of the chronograph, O-rings are often used. Because these O-rings do not always seal the interior of the timepiece to a satisfactory degree, various attempts have been made for some time to develop seals with improved sealing properties, ie, varying the cross-sectional shape of the I-ring. Background technique [0002] From patent document CH562468 a dust-tight crown cap for a timepiece is known, which cap comprises an elastically deformable sealing packing material with an S-shaped curved cross-sectional shape. Although this sealing packing material is made differently on the side of its inner space than the side facing the surrounding environment compared to the O-ring, the effect of this packing material is approximately equal in both directions, i.e., when the inside of the chronograph When there is ex...

AI Technical Summary

Problems solved by technology

[0004] However, if the pressure in the surroundings of a chronograph equipped with such a crown cap increases, for example when diving, this filling material may be less likely to penetrate into the interior of the chronograph due to the shape of the part of the filling material mentioned. Provides only a small resistance

[0005] Also, this solution has the following disadvantages: when returning the winding shaft from the hand setting position to its basic position, dust particles from the inclined filling material part may be transported together into the inside of the timer

[0012] Although excessive pressure in the timer can be reduced with this solution, narrow limits are set for the axial path of the winding shaft

Images