WO2000078174A1

WO2000078174A1 - Strap extension for a wristwatch comprising a two part strap

Info

Publication number: WO2000078174A1
Application number: PCT/CH2000/000266
Authority: WO
Inventors: Bruno Von Arx
Original assignee: Montres Choisi S.A.
Priority date: 1999-06-21
Filing date: 2000-05-15
Publication date: 2000-12-28
Also published as: EP1062888A1; EP1187540A1; AU4283200A; CH690060A5

Abstract

The invention relates to a strap extension (1.1, 1.2) for extending the strap of a wristwatch which comprises a watch casing (11) and a watch strap. Said strap consists of a first and a second strap element (12.1, 12.2). The extension can be detachably connected to the respective ends of a strap element (12.1, 12.2) and the watch casing (11). At each of their other ends, the strap elements (12.1, 12.2) have one closure device section. The two respective closure device sections together form a closure device for producing a mutual, detachable connection.

Description

Strap extension for a wristwatch with a two-part bracelet

Technical field

The invention relates to a wristwatch comprising a watch case and a watch band consisting of a first and a second band element, a first closure device part at one end of the first band element and a second closure device part at one end of the second band element for producing a releasable connection between the two band elements is trained. The invention further relates to a watch band of the type just described. State of the art

According to the latest findings, the wrists of certain groups of people or individuals of such groups have ever larger diameters worldwide.As a result, the differences between thin and thick wrists are becoming ever larger within a group of people. For wrist watch wearers, one possible consequence of this wrist enlargement is that the existing bracelet on their watch becomes too small or that no bracelets of the required size are available for new purchases

Depending on the type of bracelet, there are different solutions to this problem. In the case of bracelets that consist of many joined, identical links, the solution is simple. Only one or more additional links are added to the bracelet. A closure device is also known from CH 625 685 for this bracelet type , which has several options for fastening the last (or first) link of the bracelet to the closure device and thus results in a more or less wide bracelet

On the other hand, for bracelets that are made of leather or plastic, for example, and which consist of two parts that can be detachably connected with a clasp, the only solution to the problem is to make special oversizes of each individual bracelet type. However, this entails an enormous logistical overhead Also for those affected, the procurement of a new, larger bracelet can result in considerable costs, which are not all ready to wear.In addition, many customers lack the willingness to throw away an intact or maybe even new watch strap and to buy a new, larger one Presentation of the invention

The object of the invention is to provide a possibility for extending a watch band formed from two releasably connected band elements, the usability of which is independent of the specific structural design of the bracelet clasp.

The solution to the problem is defined by the features of claim 1. According to the invention, only wristwatches are concerned which comprise a watch case and a watch band consisting of two band elements. It does not matter whether a clockwork is used in the watch case or not. The strap elements each have a closure device part at one end, which together form a closure device with which the two strap elements can be detachably connected, so that different bracelet lengths result.

However, if the widest setting also results in a bracelet length that is too small for a specific person, a strap extension inserted between the watch case and a strap element is provided according to the invention. The strap extension is detachably connected on one side to the watch case and on the other side detachably to a strap element, the strap extension being connected to the end of the strap element opposite the closure device part.

Of course, a second strap extension can also be inserted in an analogous manner between the other strap element and the watch case. Likewise, it is of course also possible to use one or two strap extensions according to the invention despite the sufficient length of the existing bracelet.

With the strap extension described, an extension of two-part watch straps can be achieved in a simple manner. The band extension can be designed both for mounting bracelets with the same and different widths as the width of the original bracelets. In addition, both the extent of the extension and the visual appearance of the band extension can the individual needs of the wearer of the wristwatch can be tailored. There are practically no limits to the shape, taking into account individual, aesthetic aspects.

Two-part watch straps usually consist of a flexible material such as leather or plastic and have a length-adjustable locking device so that they can be adapted to the shape or size of the wrist. The first closure device part consists of a U-shaped bracket, the opening of which is e.g. is closed with a spring pin. To connect the band element to this bracket, one end of the band element is looped around the spring pin by an angle of 180 ° and then sewn, glued or otherwise connected to the part of the band element remaining on the other side, so that the spring pin is within the loop formed by the band element. In the middle of the spring pin, another pin (hereinafter referred to as a bow pin) is fastened perpendicular to and rotatable around the spring pin by being wrapped around the spring pin once. The band element has an opening at this point for this purpose. The locking pin is slightly longer than the locking clip and can therefore only be turned around the spring pin until it is in contact with the strap element on one side and the locking clip on the other side. The matching closure device part on the other band element consists only of a few holes in this band element at different distances from the end of the band element. The holes lie in a row on the longitudinal axis of the band element.

The releasable connection of the two band elements is now produced by pushing the perforated end of the one band element from the side opposite the clip pin through the closing clip and inserting the clip pin through one of the holes in the tape element. When the band element is pulled back, the bow pin strikes the locking bracket and thus prevents the band element from slipping out. This connection is released by pushing the perforated strap element back through the bracket until the strap pin slides out of the hole and then completely remove the strap element (without threading the strap pin into a hole) the locking bow is pulled out Depending on the hole through which the stylus pin is or can be inserted, this results in a slightly narrower or a slightly wider watch band

To extend the bracelet, a strap extension according to the invention is attached to at least one of the two strap elements, the mass of the strap extension being matched to the width of the strap. The width of the other end of the strap extension, which can be attached to a watch case, can be chosen as desired Strap extension is mounted on a watch case instead of a watch strap, the width of the strap extension is usually also matched to the usual strap widths. This means that the strap extension can be used in as many different ways as possible

A strap extension according to the invention preferably has a first fastening device for establishing a detachable connection between the strap extension and the watch case and a second fastening device for establishing a detachable connection between the strap extension and the watch strap. The advantage of connections that can be quickly and easily released and restored by the wearer of a wristwatch is that a strap extension can be used for different watches or different strap extensions can be used for the same watch without the need for expensive service changes a watch store must be used

In a preferred embodiment of the band extension, the second fastening device has several fastening stages. Different extensions can be implemented by fastening the bracelet in the different fastening stages

In a further embodiment of the invention, the strap extension consists of two elements. These are connected to one another, for example, by a type of cardan shaft, so that they can be rotated about a common joint axis. One of these elements is attached to the watch case and accordingly has a first attachment direction up. The watch band is fastened to the other element, which consequently has a second fastening device with one or more fastening stages. Strap extensions consisting of two elements with several adjustment options are particularly suitable for a large watch strap extension, since the strap extension adapts better to the shape of a wrist than a one-piece strap extension thanks to the mobility of the two elements. Furthermore, with two-part strap extensions, it is possible to manufacture several matching elements for one element, which are suitable, for example, for mounting on watch cases of different sizes or for fastening bracelets of different widths.

In wristwatches, the two band elements are usually attached to the watch case with a spring pin. So that the same watch case can continue to be used, the strap extension is preferably also attached to the watch case with a spring pin. For this purpose, two nose-shaped extensions (French: corne) are usually provided on two opposite sides of the watch case, each having a spring pin hole. The extensions are designed so that the two spring pin holes come to lie coaxially at a certain distance, the mounting distance. A spring pin of the correct size can now be clamped between the two spring pin holes. The first fastening device corresponds to the device for fastening a watch strap to a watch case. It essentially consists of a hole into which the spring pin can be inserted. This hole is referred to below as the spring pin receiving hole. The length of the spring pin receiving hole must be smaller than the mounting width of the two spring pin holes on the watch case. The length of the spring pin is selected so that it is larger than the mounting width in the uncompressed state, but compressed to a length smaller than the mounting width and can thus be clamped between the two spring pin holes on the watch case. Such a spring pin inserted into the spring pin receiving hole of the band extension thus looks out a bit on both sides and can thus be clamped between the spring pin holes on the watch case. Instead of a single spring pin receiving hole, it is of course also possible to provide a plurality of coaxial spring pin receiving holes through which the spring pin is inserted can be. Here too, however, the total length of all spring pin mounting holes must be smaller than the mounting width. So that the spring pin can be rotated about its longitudinal axis in the inserted state or the strap extension can be rotated around the spring pin, the diameter of the spring pin receiving hole must be larger than the diameter of the spring pin.

So that the same watch straps can also be used, the second fastening device is preferably designed such that a watch strap can also be fastened to the strap extension with a spring pin. Similar to how a fastening strap is attached to the bracelet, one end of the band element is folded over for this purpose, that is to say quasi-folded, so that the end of the band element comes to lie parallel to a central part of the bracelet. By the end of the band element with this middle part e.g. is connected by means of sewing or gluing, a kind of loop is created at this end of the band element through which a spring pin (analogous to the spring pin receiving hole of the band extension) can be inserted. The loop is large enough so that the spring pin can be rotated about its longitudinal axis in the inserted state or the band element can be turned around the spring pin. The spring pin used here must be longer than the width of the bracelet.

The second fastening device preferably consists of two opposite, plane-parallel surfaces, each with a spring pin hole. The distance between the two surfaces, the bandwidth, is larger than the width of the bracelet. So that the spring pin can be clamped between the two spring pin holes, there is a space between them and they are also coaxial. The length of the spring pin is chosen so that it is larger than the band width in the uncompressed state, but compressed to a length smaller than the band width and can thus be clamped between the two spring pin holes on the band extension.

In a particularly preferred embodiment of the invention, the band extension is designed in such a way that a spring is inserted into the spring pin receiving hole in the band extension. led spring pin parallel to a spring pin clamped between the two spring pin holes of the tape extension

If the band extension consists, as already described, of two elements which are connected to one another so as to be rotatable about a common hinge axis, this hinge axis is also preferably parallel to the two spring pins

A strap extension according to the invention preferably comprises a positioning device for positioning a watch strap which is fastened in the second fastening device of the strap extension. With this positioning device it is achieved that the assembled watch strap does not bend away from the strap extension at an undesirable angle, but rather a smooth transition from the strap extension to the bracelet arises This not only increases the wearing comfort of the wristwatch, but also has a positive effect on the visual appearance

There are various ways in which the bracelet can be positioned in the desired position, for example by means of rigid devices on the band extension, such as fixed brackets and the like, or by means of movable devices which are brought into the desired position during or after assembly of the bracelet on the band extension

A positioning device preferred because of its simplicity comprises on the one hand a spring pin which, analogous to the spring pins for mounting the bracelet on the band extension, is fixed between two spring pin holes in two opposite, plane-parallel side surfaces of the band extension and is perpendicular to the two side surfaces, and on the other hand a base surface, which is also perpendicular to the side surfaces

Since spring pins are required in any case for the assembly of a bracelet on a band extension according to the invention and the drilling of holes is already part of the production process of a band extension, the manufacture of such a positioning device results in only a minimal additional effort The two side surfaces, the spring pin fixed in between and the base area are arranged in such a way that there is just enough space between the spring pin and the base area to allow a watch strap mounted on the strap extension (ie in the second fastening device) to pass between the spring pin and the base area. Ren The spring pin thus holds the watch strap in the desired position parallel to the base

A correspondingly designed band extension is, for example, trough-shaped in the area of the second fastening device and has a u-shaped cross section with a broad base and short legs.The base forms the base area and the legs form the two plane-parallel side surfaces in which, on the one hand, the spring pin holes are located second fastening device and, on the other hand, one spring pin hole each for the mounting of the spring pin for the positioning device. With the appropriate design, one of the pairs of spring pin holes of the second fastening device can also be used for the mounting of the spring pin of the positioning device. The distance between the side surfaces is somewhat larger than the width of the bracelet, which can thus be inserted in the longitudinal direction in the "tub" between the side surfaces on the base surface. With a spring pin, the bracelet is now between two corresponding spring pin holes Fastened in the second fastening device To prevent the bracelet, which in principle can be rotated about this spring pin, from rotating out of this trough of the band extension, another spring pin is placed over the bracelet (i.e. at the upper end of the two legs of the u-section) mounted This holds the bracelet parallel to the base surface When wearing a wristwatch equipped in this way, the strap extension does not stand away from the wrist, but is pulled from the bracelet via this positioning spring pin to the wrist

A further preferred embodiment of the tape extension is that it is equipped with means for performing at least one additional function

Such means can be mechanical, such as a mirror, a folding knife (or other instruments as known from pocket knives), one Magnifying glass, a thermometer, a compass, an additional analog clock with display or any other mechanical means

Such means can, however, also be of an electrical type, such as an additional digital watch with a display (or just a corresponding display to show the time of the wristwatch), a lamp, a heart rate monitor with corresponding sensors and displays, a pocket calculator, and an electronic one Calendar or even a microchip with which any functions (e.g. authorization in the case of electronic access barriers, identification of the wearer, storage of data which can be entered using an appropriate input device, etc.) can be implemented

In short, such means can include everything that can be manufactured in the appropriate size and integrated into a strap extension according to the invention or attached to it. For the operation or use of such means, existing parts of the wristwatch or bracelet, such as an already existing battery, can also be used

From the following detailed description and the entirety of the claims, further advantageous embodiments and combinations of features of the invention result

Brief description of the drawings

The drawings used to explain the exemplary embodiment show

1 is a perspective view of a tape extension according to the invention,

2a) a wristwatch with a bracelet and two one-piece band extensions from above, 2b) the wristwatch from FIG. 2a) from the side,

3a) a one-piece belt extension with double length adjustment from above,

3b) the band extension from FIG. 3a) from the side,

4a) a one-piece band extension for original wristbands from above,

4b) the band extension from FIG. 4a) from the side,

5a) a two-part belt extension with triple length adjustment,

5b) the band extension from FIG. 5a) from the side,

6a) a strap extension with double length adjustment and a positioning device for the watch strap;

6b) the band extension from FIG. 6a) from the side,

7a) a strap extension with triple length adjustment and a positioning device for the watch strap;

7b) the band extension from FIG. 7a) from the side;

8a) a section of a wristwatch with a bracelet and a strap extension with a positioning device and additional function from above,

Fig. 8b) the section of the wristwatch from Fig. 8a) from the side In principle, the same parts are provided with the same reference symbols in the figures

Ways of Carrying Out the Invention

FIG. 1 shows a perspective view of a strap extension 1 according to the invention, the underside of the strap extension 1 being visible. The strap extension 1 is designed such that a watch band is fastened to a watch case by means of a spring pin at the front end 2 and the rear end 3 itself by means of a spring pin The front end 2 is like a hollow cuboid without a lid.There are three spring pin holes in each of the two rare walls 4 1, 4 2 of this cuboid, with a spring pin hole in each side wall 4 1, 4 2 lie exactly opposite and together form three pairs of spring pin holes 5 1, 5 2, 5 3, so that a hole axis 6 1, 6 2, 6 3 through the centers of the two spring pin holes of a pair of spring pin holes 5 1 , 5 2, 5 3 exactly perpendicular to the rare walls 4 1, 4 2 egt The bandwidth 7 is equal to the distance between the two holes of such a pair of spring pin holes 5 1, 5 2

The strap elements of a watch strap that can be used for fastening to the strap extension each have a spring pin receiving hole at those ends with which they are attached to a strap extension. This is formed by the corresponding end of the strap element being turned through 180 ° transversely to the longitudinal direction of the strap, the tape is then folded and the folded end is sewn, glued or otherwise attached to the underside of the same tape element. To attach a tape element to the tape extension, a spring pin is first inserted through the spring pin hole so that it is still on both sides something looks out and then the two ends of the spring pin are clamped between the holes in a pair of spring pin holes 5 1, 5 2, 5 3 of the tape extension

The rear end 3 is also similar to a cuboid with the same height. In this example, the width is equal to the width of the front end 2. The cuboid has a spring pin receiving hole (8), the hole axis (9 of which is parallel to the hole axes 6 1, 6 2 , 6 3 has A spring pin, with which the strap extension 1 is fastened to the watch case, can be inserted through the spring pin receiving hole (8). The case width 10 corresponds to the width of this cuboid or the width of the rear end 3.

Figures 2a) and 2b) show a wristwatch consisting of a watch case 1 1 (with clockwork) and a watch band consisting of two band elements 12.1, 12.2, being between the watch case 1 1 and the first band element 12.1 and between the watch case 1 1 and the second Band element 12.2 a band extension 1.1, 1.2 is mounted. Figure 2a) shows the wristwatch from above and Figure 2b) shows a cross section through the wristwatch from the side.

The watch case 11 has a pair of nose-shaped extensions 13.1, 13.2 on two opposite sides, the mutually facing inner nose surfaces of a pair being plane-parallel and at a certain distance from one another. The mounting width 15 corresponds to this distance. There is a spring pin hole in each of these inner nose surfaces. A hole axis 16.1, 16.2 through the centers of the two spring pin holes of a pair of nose-shaped extensions 13.1, 13.2 is exactly perpendicular to the two inner surfaces of the nose.

In order to be able to mount a strap extension on a watch case with a certain mounting width, the case width of the strap extension must in any case be smaller than the mounting width of the watch case.

Each of the band extensions 1.1, 1.2 is formed in one piece and has only one pair of spring pin holes 18 for fastening the band elements 12.1, 12.2. The strap extension 1.1, 1.2 is the same width at both ends and thus results in a strap width (7 that is twice the thickness of the side walls smaller than the housing width 10. An even smaller strap width can be achieved by the width of the strap extension on the speaking end is chosen smaller than the width at the end with the spring pin hole 19. By means of a spring pin which is inserted through the spring pin receiving hole 19 of the strap extension 1 1, 1 2, the strap extension 1 1, 1 2 can be attached to the watch case 1 1 by the spring pin between the two spring pin holes in the nasal surfaces a pair of nose-shaped extensions 13 1, 13 2 is clamped

In Figures 3a) and 3b) a one-piece tape extension 1 3 is shown, which has two pairs of spring pin holes 20 1, 20 2 for fastening a tape element in Figure 3 a) from above and in Figure 3b) from the Das Spring pin receiving hole 21 1 is also shown in FIG. 3a), although it is not visible in this view. The first pair of spring pin holes 20 1 in a first hole spacing 22 1 and the second in a larger, second hole spacing 22 2 from the spring pin receiving Hole 21 1 The band width (7 is again smaller than the case width 1 0) The band extension 1 3 is attached to a watch case by means of a spring pin inserted through the spring pin receiving hole 21 1 at one end of the band extension 1 3

By using one or two such strap extensions 1 3 and by attaching the strap elements in one of the two pairs of spring pin holes 20 1, 20 2 of the strap extension (s) 1 3 used, a watch strap can be extended in a variety of ways by using two Strap extensions 1 3 can achieve a maximum watch strap extension of twice the size of the second hole spacing 22 2. The minimum watch strap extension is equal to the first hole spacing 22 1 when using a single strap extension 1 3 and using the spring pin-hole pair 20 2

Figures 4a) and 4b) also show a one-piece tape extension 1 4 with two pairs of spring pin holes 23 1, 23 2 for fastening a tape element in Figure 4a) from above and in Figure 4b) from the side The spring pin receiving hole 21 2 also shown in Figure 4a), although it is not visible in this view. In contrast to the tape extension 1 3 shown in Figure 3, the bandwidth (7 is, however, a little larger than the housing width 10) It corresponds exactly to the mounting width 1 5 of the corresponding Watch case. This means that the original watch bracelets or bracelets with the same bandwidth can also be mounted on the band extension 1.4.

A belt extension according to the invention can of course also be designed such that its belt width is larger than the installation width.

A two-part belt extension 1.5 is shown in Figures 5a) and 5b). The rear end with the spring pin receiving hole 21.3 forms the first element 24.1 and the front end with three pairs of spring pin holes 25.1, 25.2, 25.3 forms the second element 24.2 of the band extension 1.5. The first element 24.1 has a T-shaped configuration (lying down), the spring pin receiving hole 21.3 running through the crossbar of the T and parallel to the spring pin receiving hole 21.3, an articulated hole 26 running through the longitudinal bar of the T. The second element 24.2 has the shape of a U with a broad base (also lying). The spring pin-hole pairs 25.1, 25.2, 25.3 run through the base of the U and in each leg of the U runs parallel to the hole axes of the spring pin-hole pairs 25.1, 25.2, 25.3, a hinge hole 27.1, 27.2. The distance and the length of the two legs of the U-element correspond to the width and. the length of the longitudinal bar of the T-element. The two elements 24.1, 24.2 of the band extension 1.5 are arranged so that the hinge hole 26 in the longitudinal bar of the T-element and the two hinge holes 27.1, 27.2 in the legs of the U-element are coaxial and consequently a drive shaft 28 can be pushed through, thereby the two elements 24.1, 24.2 are rotatably connected to one another about a common hinge axis, namely the longitudinal axis of the hinge shaft 28.

The width of the base of the U element is larger than the width of the crossbar of the T element. The strap width (7) therefore corresponds to the mounting width 15 and is a little smaller than the housing width 10 of the strap extension 1.5. This makes it possible to mount the strap extension 1.5 between the strap elements and the watch case of an existing watch. You can continue to use or use the original bracelets . extend. 6a) and 6b) show a one-piece strap extension 1.6 with double length adjustment by means of the spring pin-hole pairs 20.1, 20.2 and a strap element 12.1 of a watch strap mounted thereon. Figure 6a) shows the tape extension from above, Figure 6b) from the side. Furthermore, the band extension has a further spring pin-hole pair 29, in which a spring pin 31.1 is fixed. The band element 12.1 is fastened with a spring pin 31.2 in the spring pin-hole pair 20.1. In Figure 6b) is shown in broken lines how the band element 12.1 is placed around the spring pin 31.2.

The spring pin 31.1 lies parallel to the base 30 of the band extension 1.6 and thereby also holds the base element 12.1 parallel to the base 30. As a result, the band element 12.1 cannot buckle downward (as shown). The distance of the spring pin-hole pair 29 to the base area 30 is selected to be greater than that of the spring pin-hole pairs 20.1 or 20.2 to the base area 30, the minimum distance of the spring pin 31.1 from the base area 30 typically being greater than the thickness of the bracelet at the point where the spring pin 31.1 comes to rest. If this distance is smaller than the corresponding bracelet thickness, the assembly of the spring pin 31.1 compresses the bracelet at that point, which is of course possible to a certain extent (depending on the material of the bracelet).

FIGS. 7a) and 7b) show a two-part strap extension 1.7 with triple length adjustment by means of the spring pin-hole pairs 25.1 to 25.3 and a strap element 12.1 of a watch strap mounted thereon. Figure 7a) shows the tape extension from above, Figure 7b) from the side. This band extension also has a base area 30 and a further spring pin-hole pair 29 with a spring pin 31.1 mounted therein. The band element 12.1 is mounted with a spring pin 31.2 in the spring pin-hole pair 25.1. The spring pin 31.1 holds the band element 12.1 parallel to the base 30 of this band extension 1.7.

So that the spring pin 31.1 can also exert its effect when the band element 12.1 is set to full extension (as shown in FIGS. 6a), 6b), 7a) and 7b)), the spring pin-hole pair 29 with the spring pin 31.1 accordingly further from the first fastening device be removed as the spring pin-hole pair 20 1 or 25 1 D h the spring pin-hole pair 29 is located in the direction of the band element 12 1 further away from the rear end 3 of the band extension 1 6 or 1 7 than the spring pin hole -Pair 20 1 or 25 1 for the grosstmoghche bracelet extension

FIGS. 8a) and 8b) show a section of a wristwatch with a watch case 11 and a band element 12 2 mounted via a band extension 1 8. Here too, the wristwatch is shown in FIG. 8a) from above and in FIG. 8b) from the side 1 8 includes additional functional means 32, which are mounted on the top (as shown) of the belt extension 1 8

The example shown shows, as functional means 32, a digital display 33, for example for displaying a second time, the date, a stopped time, the pulse frequency of the wearer, the skin or ambient temperature or any other data. Corresponding instruments and devices, such as a watch, a pulse measuring device or a temperature sensor can also be integrated in the corresponding functional means 32, or they are attached at another location in or on the belt extension 1 8

In summary, it can be stated that the strap extension according to the invention allows the strap of a wristwatch to be extended in several stages in a simple manner. Both the same watch strap can still be used or a different strap can be fitted, the width of which is smaller, equal or larger than that of the original band

Claims

claims

1 wristwatch, comprising a watch case and a watch band consisting of a first and a second band element, a first closure device part at one end of the first band element and a second closure device part at one end of the second band element for producing a detachable part

Connection is formed between the two strap elements, characterized in that at least one strap extension is provided, which is detachably connected both to the watch case and to one of the two strap elements, the strap extension being connected to the end of the strap element opposite the closure device

2 wristwatch according to claim 1, characterized in that two strap extensions are provided, the first strap extension being connected to the watch case and the first strap element and the second strap extension being connected to the watch case and the second strap element

3 watch band for a wristwatch according to claim 1, comprising a first and a second band element, wherein a first closure device part and a second closure device part is formed at one end of the first band element and at one end of the second band element for producing a releasable connection between the two band elements, thereby characterized in that at least one strap extension is provided, which is detachably connected to one of the two strap elements, the strap extension being connected to the end of the strap element opposite the closure device part

4 strap extension for a wristwatch according to claim 1, characterized in that the strap extension is a first fastening device for producing a Detachable connection with a watch case and a second fastening device for producing a detachable connection with a watch band.

5. Belt extension according to claim 4, characterized in that the second fastening device has a plurality of fastening steps, so that different extensions can be selected.

6. Strap extension according to claim 4 or 5, characterized in that the strap extension consists of two elements which are rotatably connected to each other about a hinge axis, wherein one element has the first fastening device and the other element has the second fastening device.

7. Band extension according to one of claims 4 to 6, characterized in that the first fastening device has one or more coaxial spring pin receiving holes for receiving a spring pin, wherein the spring pin receiving holes are formed such that the spring pin in the direction of a longitudinal axis of the spring pin the spring pin or holes can be inserted, that the spring pin projects beyond the spring pin holes with both ends, and that the inserted spring pin is rotatable about its longitudinal axis.

8. tape extension according to one of claims 4 to 7, characterized in that the second fastening device each has a spring pin hole in two opposite, plane-parallel surfaces of the tape extension, the spring pin holes are formed such that a spring pin between the spring pin Holes can be fixed and that a longitudinal axis of the fixed spring pin is perpendicular to the two plane-parallel surfaces.

9. Belt extension according to claim 7 and 8, characterized in that the first and the second fastening device are designed such that one in the first Fastening device inserted first spring pin is axially parallel to a second spring pin fixed in the second fastening device.

10. Band extension according to one of claims 4 to 9, characterized in that it has a positioning device for positioning a watch band fastened in the second fastening device.

11. The band extension according to claim 10, characterized in that the positioning device comprises a spring pin which is fixed between each spring pin hole in two opposite, plane-parallel side faces of the band extension and is perpendicular to the side faces and a base face which is perpendicular to the side faces, the side faces with the spring pin and the

Base surface are arranged such that a watch strap fastened in the second fastening device can be inserted and positioned between the spring pin and the base surface.

12. Belt extension according to one of claims 4 to 1 1, characterized in that it is equipped with means for performing at least one additional function.