DE3316327A1 - DEVICE FOR SEALINGLY FASTENING A GLASS ON AN ELEMENT OF A WATCH CASE - Google Patents

Description

- 3 Description

The invention relates to a device for tightly securing a glass on an element, e.g. B. a bezel or case ring bezel, a watch case.

In general, the casing ring of a watch case has a contact surface which forms a seat for the glass and on which the Glass rests. The tight fastening of the glass on the housing ring is carried out by arranging a compressible seal between the circumference of the glass and the housing ring. This seal is usually I or L shaped and sometimes can be inserted into an annular groove in the housing ring so that their axial positioning is guaranteed.

In these embodiments, the top is the seal visible, which damages the appearance of the watch. In addition, the seal can deteriorate in contact with air and dust will. Ultimately, aging of the seal causes cracks that can result in seal failures.

There are also watch cases in which the glass is glued into a recess in the case ring. In these latter embodiments it is difficult to replace the scratched glass, for example, and the seal is not guaranteed.

The object of the invention is to create a device for tight fastening of a glass to an element of a watch case, the disadvantages of the specified embodiments be avoided.

According to the invention, this object is achieved by the object of claim 1.

Advantageous further developments of the invention are the subject of the subclaims.

In the following, exemplary embodiments of the invention are based on described in the drawing. Show it:

Fig. 1 is a partial section of a watch case using the device for sealing the glass according to the Invention;

Fig. 2 is an enlarged partial section of a watch case of an embodiment of the device according to the invention;

3 shows an enlarged partial section of a watch case of a further embodiment of the device according to the invention.

In the embodiment of FIG. 3, the device has to seal Fastening a glass 1 on a housing ring 2 of the watch case, a contact surface 3 formed in the housing ring 2, the z. B. is 0.75 mm from the top of the housing ring. This contact surface is located on the entire circumference of the housing ring and thus forms a seat for receiving the glass 1.

The glass 1 has a diameter or, in the case of a molded housing, an external dimension, which corresponds to the dimensions of the seat of the housing ring such that the glass is fixed in this seat. That Glass 1 is preferably pressed into the seat of the housing ring 2, but can also be glued into this seat.

The underside of the glass has a bevel 4 which, in the operating position, together with the angled portion of the seat formed in the housing ring 2, forms an annular space. A circular or designed according to the shape of the seat O-ring seal 5 is in the operating position pressed together in the cavity, which it practically completely fills, and ensures complete sealing between the housing ring 2 and the glass 1. The O-ring seal b is thus completely protected and does not extend

between the glass and the housing ring, which are in close contact over part of the thickness of the glass 1.

So that the O-ring seal 5 is not visible through the glass 1, it can be translucent or translucent. In a further embodiment, the bevel 4 of the glass is metallized or matt-polished and thus forms a cover for the O-ring seal 5.

In the non-deformed state, the O-ring seal can have a cross-section with a diameter of, for example, 0.3 mm.

The main advantages of this embodiment are:

1. The glass is in mechanical contact with the housing ring 2, which ensures perfect definition of the glass.

2. The O-ring seal 5 is completely protected, whatever avoids accidental damage thereof and reduces their aging.

3. The O-ring seal 5 is invisible.

4. This embodiment can be used for round or shaped watches and is particularly suitable for extra-flat small watches, since it does not take up any space in height, which under certain conditions reduces the height of the watch case allowed.

In the embodiment shown in Figs. 1 and 2, the has Housing ring 2 also has an inclined surface 6. This allows for a dimensioning of the O-ring seal 5 and, consequently, of that which it receives Cavity a reduction in length of the slope 4 of the glass and thus the height of this cavity. This also enables a Reduction in the height of the glass and the contact surface of the housing ring.

Here, too, the glass 1 is pressed or glued into the recess of the housing ring 2, the seal being invisible, because it is translucent or due to a metallization or a matt finish of the bevel of the glass 1.

In addition to the stated advantages, this second embodiment allows also a reduction in the height of the glass and thus of the watch case.

The bevel 4 of the glass 1 preferably closes with the underside of the glass 1 at an angle of 45 °.

Claims (6)

Patent attorneys. :. 3teinsdorfstr.i * 8000 ^R Munchen22 56-34 .9o4P (V,. «>" 5ii) / ,. M, im, «·, JEAN LASSAI.H SA
CH-1227 Carouge, Geneva Device for tightly fastening a glass on a Element of a watch case Expectations Device for tightly securing a glass on an element of a watch case, characterized , - That the glass (1) has a cylindrical peripheral surface, those with an opening of the corresponding shape of the element (2) for fastening the glass (1) on the element (2) cooperates - That the underside of the glass (1) on a contact surface (3) of the element (2) and - That the glass (1) has a peripheral bevel (4), which in the operating position together with the front and side Walls of the contact surface (3) delimits an O-ring seal (5) receiving space. 2. Device according to claim 1,
characterized, - That the glass (1) is pressed into the element (2) 3. Device according to claim 1,
characterized, 56-7835 - That the glass (1) is glued into the element (2). 4. Device according to one of claims 1 to 3, characterized in that - That the peripheral bevel (4) is metallized. 5. Device according to one of claims 1 to 3, characterized in that - That the peripheral bevel (4) is ground matt. 6. Device according to one of claims 1 to 3, characterized in that - That the O-ring seal (5) is translucent or transparent is.