CH718880A2 - Device for fixing a caseback to a middle part of a watch case in an oriented manner. - Google Patents

Abstract

The present invention relates to a device for fixing a back (1) to a middle part (2) of a watch case (100), the back (1) being arranged to be pushed onto the watch case (100), characterized in that it comprises a casing circle (3) to which is linked at least one polarizer (4), said polarizer (4) being arranged to cooperate with at least one machining (10) of the bottom (1) in such a way to guarantee the orientation of the back (1) with respect to the caseband (2) along the 12 o'clock-6 o'clock axis of the watch.

Description

The present invention relates to funds for timepieces and more particularly such funds comprising a pattern or a logo on their outer face and in which said pattern or logo can be oriented as desired.

TECHNOLOGICAL BACKGROUND

[0002] It often happens that, when the face of a watch case back on the middle of the latter, we realize that, when the back is completely screwed down, the inscriptions or decorative motifs which may have been for example struck by stamping or engraved on the face of the back located on the side of the wrist of the wearer of the watch, are not suitably aligned with respect to the vertical axis 12H-6H of the said watch, which, of course, harms the aesthetic aspect of this watch.

[0003] This appearance defect, if it can be tolerated for inexpensive watches, constitutes a very inconvenient drawback for more expensive watches.

[0004] To overcome this drawback, the only known solution to date consists in matching a back with a watch case determined during machining, so that it is ensured that once completely screwed down, the back is perfectly aligned with the 12H-6H axis of the watch. However, this solution is only unsatisfactory because you run the risk of problems if ever the original caseback of the watch is lost or damaged and it is necessary to replace it with another caseback which you are not familiar with. sure that once screwed onto the caseband, it always aligns properly with the vertical axis 12 o'clock-6 o'clock.

SUMMARY OF THE INVENTION

The present invention aims to remedy this drawback as well as others by proposing a system allowing, after screwing a bottom on the caseband of a watch case, to adjust in a simple and effective orientation of the bottom relative to the watch, so as to guarantee a suitable arrangement of the inscriptions and other decorative motifs which have been transferred to the face of the bottom of the watch facing the side of the wrist of the wearer of this watch.

[0006] To this end, the present invention relates to a device for fixing a bottom on a middle part of a watch case, the back being arranged to be driven onto the watch case, characterized in that it comprises a casing circle to which is linked at least one keying device, said keying device being arranged to cooperate with at least one machining of the back so as to guarantee the orientation of the back relative to the middle part along the 12H-6H axis of the watch.

[0007] Thanks to these characteristics, the present invention provides a device for fixing a watch case bottom which allows both to completely drive this bottom on the caseband of the watch so as to ensure the sealing of this last and to orient the back correctly in relation to the case middle along the 12 o'clock-6 o'clock axis of the watch.

[0008] In accordance with other advantageous variants of the invention: the corrector is a pin driven into the casing circle; the corrector and the casing ring form a single element; said at least one machining is of complementary shape to the corrector; the device comprises an annular gasket made of compressible material, said gasket being placed between the back cover and the middle part to provide sealing; the polarizer protrudes with respect to the junction plane between the back and the caseband so as to guide the caseback on the caseband.

The invention also relates to a timepiece comprising a fixing device according to the invention.

BRIEF DESCRIPTION OF FIGURES

[0010] The aims, advantages and characteristics of the device for fixing a caseback to a middle part of a watch case will appear better in the following description on the basis of at least one non-limiting embodiment illustrated by the drawing. on which : Figure 1 is a sectional view of a watch case equipped with a device for fixing a case back to a middle part according to the invention.

DETAILED DESCRIPTION

[0011] Figure 1 illustrates a device for fixing and orienting a back 1 on a middle part 2 of a watch case, the back part 1 being intended to be driven onto the middle part 2.

According to the invention, the device comprises a casing ring 3 to which is linked at least one polarizer 4 arranged to cooperate with at least one machining 10 of the bottom 1 so as to guarantee the orientation of the bottom 1 with respect to the middle 2 along the 12 o'clock-6 o'clock axis of the watch, the back 1 comprising an outer face bearing a pattern such as a logo or a brand.

As can be seen in Figure 1, the bottom consists of a skirt 11 and a ring 12 projecting from the skirt, the ring being arranged to rest in the caseband 2 once the bottom 1 hunted.

[0014]According to a first embodiment, the corrector 4 is in the form of a pin which is driven into the casing circle 3, the casing circle 3 having an orifice arranged to receive the pin.

[0015] According to a second embodiment, the polarizer 4 and the casing ring 3 form a single element. They can for example be manufactured via plastic injection or molding, machining in the mass could also be envisaged. This embodiment has the advantage of being simpler to set up and less expensive to produce.

[0016] Thanks to such an arrangement, the angular rotation of the back 1 relative to the middle part 2 is blocked (therefore its position) by the polarizer 4 which engages when driving in the back 1.

[0017] In order to limit the play as much as possible once the whole is assembled, said at least one machining 10 has a shape complementary to keying pin 4, the keying pin being arranged to be inserted by force into machining 10 of bottom 1.

According to the invention, an annular seal 30 made of compressible material, is placed between the bottom 1 and the middle part 2, and more precisely outside the ring 12 of the bottom to ensure sealing once the back assembled on the middle.

[0019] Advantageously, keyed 4 projects slightly from junction plane P between back 1 and middle part 2 so as to also act as a guide element when bottom 1 is assembled on middle part 2, the corrector 4 coming into engagement with the bottom 1 or the casing ring 3 before the annular seal 30 begins to be compressed.

[0020] The casing circle 3 and the polarizer 4 can be made of plastic material in the case where they form a one-piece element. In the other case, polarizer 4 can be made of a metallic or plastic material.

The assembly of the fixing device according to the invention takes place as follows. The movement and the casing ring 3 are mounted in the middle part 2. Once the casing ring 3 has been fixed in the middle part 2, the back cover 1 is placed in relation to the corrector 4 so as to partially insert the latter into the machining 10 of back 1. Once back 1 has been placed and polarizer 4 partially inserted in machining 10, back 1 is pushed onto caseband 2 until the caseback comes into abutment against caseband 2.

It goes without saying that the invention is not limited to the embodiment which has just been described and that various modifications and simple variants can be envisaged without departing from the scope of the invention. By way of example, the corrector can also be placed on the bottom instead of the casing ring.

Claims (7)

1. Device for fixing a bottom (1) to a middle part (2) of a watch case (100), the bottom (1) being arranged to be driven onto the middle part (2), characterized in that it comprises a casing ring (3) to which is linked at least one polarizer (4), said polarizer (4) being arranged to cooperate with at least one machining (10) of the bottom (1) so as to guarantee the orientation of the back (1) relative to the middle (2) along the 12 o'clock-6 o'clock axis of the watch. 2. Device according to claim 1, characterized in that the polarizer (4) is a pin driven into the casing circle (3). 3. Device according to claim 1, characterized in that the polarizer (4) and the casing circle (3) form a single element. 4. Device according to one of claims 1 to 3, characterized in that said at least one machining (10) is of complementary shape to the polarizer (4). 5. Device according to one of claims 1 to 4, characterized in that it comprises an annular seal (30) made of compressible material, said annular seal (30) being placed between the bottom (1) and the caseband (2 ) to seal. 6. Device according to one of the preceding claims, characterized in that the polarizer (4) projects relative to the junction plane (P) between the bottom (1) and the middle part (2) so as to guide the bottom ( 1) on the middle (2). 7. Timepiece comprising a fixing device according to one of claims 1 to 6.