Watch case comprising a rotary bezel
阅读说明:本技术 包括旋转表圈的表壳 (Watch case comprising a rotary bezel ) 是由 R·德拉桑塔 于 2020-03-16 设计创作,主要内容包括:本发明涉及一种表壳(1),其包括旋转表圈(4)和中间部件(3),该表圈(4)被安装成能够在中间部件(3)上以旋转方式运动,所述表圈(4)和所述中间部件(3)在其间限定有环形腔室(12),该环形腔室在内部包括用于在表圈(4)与中间部件(3)之间产生摩擦力矩的摩擦力矩产生装置(11),该摩擦力矩产生装置(11)包括压缩构件(14)和制动元件(15),该压缩构件(14)在制动元件(15)上施加压缩应力,在该作用下,所述制动元件(15)被压靠在表圈(4)上。(The invention relates to a watch case (1) comprising a rotary bezel (4) and an intermediate part (3), the bezel (4) being mounted so as to be movable in a rotary manner on the intermediate part (3), said bezel (4) and said intermediate part (3) defining between them an annular chamber (12) which internally comprises a friction torque generating device (11) for generating a friction torque between the bezel (4) and the intermediate part (3), the friction torque generating device (11) comprising a compression member (14) and a braking element (15), the compression member (14) exerting a compressive stress on the braking element (15), under which action the braking element (15) is pressed against the bezel (4).)
1. Watch case (1) comprising a rotary bezel (4) and an intermediate part (3), said bezel (4) being mounted so as to be movable in a rotary manner on said intermediate part (3), said bezel (4) and said intermediate part (3) defining an annular chamber (12) therebetween, said annular chamber (12) internally comprising a friction torque generating device (11) for generating a friction torque between said bezel (4) and said intermediate part (3), said friction torque generating device (11) comprising a compression member (14) and a braking element (15), said compression member (14) exerting a compressive stress on said braking element (15), under which action said braking element (15) is pressed against said bezel (4).
2. Watch case (1) according to claim 1, characterised in that said compression member (14) is a gasket of the O-ring type.
3. Watch case (1) according to claim 1, characterised in that the braking element (15) is a polyoxymethylene ring.
4. Watch case (1) according to claim 1, characterised in that the shore hardness and/or the section of the compression member (14) contribute to define the compressive stress applied to the braking element (15).
5. Watch case (1) according to claim 1, characterised in that the annular chamber (12) is formed by a groove (7) formed in the outer wall of the middle part (3) and a portion (13) of the inner wall of the bezel (4).
6. Watch case (1) according to claim 5, characterised in that the compression member (14) is defined in contact with both the groove (7) of the annular chamber (12) and the braking element (15).
7. Watch case (1) according to claim 5, characterised in that said braking element (15) is defined in contact with both said portion of said annular chamber (12) and said compression member (14).
8. Watch case (1) according to claim 1, characterised in that the braking element (15) comprises a friction surface intended to engage with a contact area (19) of a portion (13) of the annular chamber (12).
9. Watch case (1) according to claim 1, characterised in that it comprises two grooves (6, 9) defined respectively in the middle part (3) and in the bezel (4) and arranged facing each other and intended to house a spring (8) for assembling the bezel (4) to the middle part (3).
10. Watch comprising a case (1) according to claim 1.
Technical Field
The invention relates to a case for a timepiece having a middle part and a bezel rotatable on the middle part, said case comprising a friction torque generating device interposed between said bezel and said middle part.
The invention also relates to a watch having such a watch case equipped with the friction torque generating device.
Background
In the prior art, external rotating bezels are often equipped with diving watches or watches indicating global time, and are used in many applications. Generally, the rotary bezel is grooved on its outer periphery for easy gripping. Furthermore, they must be mounted on the middle part of the watch case so as to rotate in unison without providing too much resistance, but without moving accidentally. Therefore, the rotating bezel must be mounted in such a way that it generates a consistent friction between the parts of the same series, in order to allow a rational manufacture without the need to modify each part. Furthermore, the fastening means must be easy to install and must provide sufficient assurance that the bezel is prevented from falling off and being removed in the event of a shock or accidental rubbing.
It is known that a rotating bezel is generally mounted on an intermediate part by means of a corrugated or bladed wire which engages simultaneously in a groove of the bezel and in a groove of the part of the intermediate part that supports the bezel. When the bezel is mounted, the wire is elastically deformed to change its longitudinal expansion. The guarantee of preventing the bezel from falling off is not always satisfactory; moreover, the correct positioning of these known devices is often highly tricky.
It is also known for a rotary bezel to be connected to a fixed part of a watch case by means of a flat elastic ring which is radially open at a point along its circumference and whose outer rim and inner rim engage in grooves formed in the rotary bezel and in the part supporting the rotary bezel. Such an assembly ensures sufficiently accurate guidance of the rotary bezel but requires additional means to lock the two ends of the ring in position relative to one of the parts of the assembly.
Disclosure of Invention
The aim of the present invention is to overcome the above mentioned problems and others by improving the known assembly operations for assembling a rotating bezel to the middle part of a watch case so that they better satisfy the various requirements deriving from the use of the bezel.
To this end, the invention relates to a watch case comprising a rotary bezel and an intermediate part, the bezel being mounted so as to be movable in rotation on the intermediate part, said bezel and said intermediate part defining an annular chamber therebetween, the annular chamber internally comprising friction torque generating means for generating a friction torque between the bezel and the intermediate part, said friction torque generating means comprising a compression member exerting a compressive stress on a braking element, under which said braking element is pressed against the bezel, and a braking element.
Thanks to these features, the friction torque generating means for generating a friction torque between the bezel and the intermediate part therefore help to ensure a constant, uniform and stable braking by friction during the entire life of the watch, allowing the bezel to rotate in a uniform manner without encountering too much resistance, but without accidentally moving.
In other embodiments:
-the compression member is an O-ring type gasket;
-the braking element is a polyoxymethylene ring;
the shore hardness and/or the cross section of the compression member contribute to defining the compressive stress applied to the braking element;
the annular chamber is formed by a groove formed in the outer wall of the intermediate part and by a portion of the inner wall of the bezel;
the compression member is defined in contact with both the groove of the annular chamber and the braking element;
the braking element is defined in contact with both a portion of the annular chamber and the compression member;
the braking element comprises a friction surface intended to engage with a contact area of a portion of the annular chamber; and is
The watch case comprises two grooves defined in the middle part and in the bezel, respectively, and arranged facing each other and intended to house a spring for assembling the bezel to the middle part.
The invention also relates to a watch comprising such a case.
Drawings
The invention will be described in more detail hereinafter with the aid of the accompanying drawings, given by way of non-limiting example, in which:
figure 1 is a partial section of a watch case according to the invention;
figure 2 is an enlarged view of part a of the watch case shown in figure 1 according to the invention;
figure 3 is a partial section of an alternative embodiment of a watch case according to the invention; and
figure 4 is an enlarged view of part B of this alternative embodiment of the watch case of figure 3 according to the invention.
Detailed Description
The invention will now be described in connection with a
In figures 1, 2 and 3, this
The
The
The
With reference to figure 3, it should be noted that, in an alternative embodiment of
In this configuration, the friction torque generating means for generating the friction torque between the
It should be noted that in this friction torque generating
Herein,
In this
Such a braking element preferably has:
an elastic modulus of 2,500 to 3,500GPa, the elastic modulus of the braking element being greater than the elastic modulus of the
-a low coefficient of friction (in particular on steel) of 0.25 to 0.60 and is constant under the following conditions: dry, wet, oily;
a good resistance to wear of 0.75u/km, defined by practical applications, which produces good results, in particular when the braking element is made of POM and the bezel is made of steel.
It should be noted that in general, the braking element has good fatigue strength, good chemical resistance properties, good creep strength and good high temperature resistance properties, in particular when made of POM.
Thus, it has been observed that the
It goes without saying that the invention is not limited to the examples shown, but that various alternatives and modifications apparent to those skilled in the art can be made thereto.
- 上一篇:一种医用注射器针头装配设备
- 下一篇:一种手表水压式密封橡胶圈