HK1209403B - Monitoring of supporting means in elevator systems - Google Patents

Description

Monitoring of a support means in an elevator installation

Technical Field

The subject matter of the invention is a monitoring solution for a support means in an elevator installation, in particular a support means suitable for monitoring and an elevator installation with such a support means, and also a method for monitoring a support means.

Background

In some conveying devices (e.g. elevator installations, cranes or escalators), belt-shaped support means are used. The load-bearing means essentially comprise a plurality of tension carriers made of steel cables, which absorb the tensile forces to be absorbed by the load-bearing means. The tensile carriers are generally surrounded by a plurality of sheaths of a synthetic material. The jacket protects the tensile carriers, for example, against mechanical wear, since the support means are usually guided by means of deflection points. The jacket also improves the traction of the support means on the deflecting or drive rollers and fixes the arrangement of the tensile carriers relative to one another.

Such a support means is a safety-critical component inside the transport device. Failure or breakage of the load bearing mechanism may result in the dropping of the transported object. This can result in serious physical and personal injury. For this reason, inspection units are used in conveying devices, which inspect the mechanical state of the tensile carriers in particular. Damage on the tension carriers that absorb the force should thus be able to be detected early so that the support means can be replaced if damaged in order to prevent a malfunction of the transport device.

The electrically conductive metallic tensile carriers are surrounded by an insulating sheath made of a synthetic material. In order to check the condition of the tension carriers, in some methods, it is necessary to bring the contact elements into contact with the tension carriers. In the known method, an electric current is conducted through the tensile carriers by means of contact elements, and the electric current is used as a test current for verifying the state of the tensile carriers.

DE 3934654 a1 shows a conventionally constructed support means. The ends of the tension carriers are connected in pairs in an electrically conductive manner to the bridging element, so that the tension carriers of the support means are wired electrically in series. The tensile carriers of the support means are connected to a power source via an ammeter, so that the state of the tensile carriers can be determined by means of an inspection current conducted through all the tensile carriers on the basis of a series connection of electrical connections.

WO 2005/094249 a2 shows a system for contacting a support means, in which contact elements penetrate through a jacket of the support means perpendicular to the longitudinal axis of the tensile carriers and penetrate into the tensile carriers. The disadvantage here is that the contact elements may not encounter the tensile carriers due to the required passage through the jacket. Furthermore, the transition resistance between the tensile carriers and the contact elements penetrating into them can change in a time-dependent manner, which adversely affects the persuasion of the monitoring method.

WO2010/057797a1 and WO2011/003791a1 show systems for contacting a support means, in which contact elements are brought onto exposed tensile carriers of the support means, for example by means of elastic contacts or by means of contact tips which penetrate into the tensile carriers. A disadvantage of such a contact system is that the connection between the contact element and the tension carrier is not durable and that there is a high transition resistance between the contact element and the tension carrier.

Disclosure of Invention

The object of the invention is to provide a support means which can be monitored in an elevator installation, wherein the tensile carriers of the support means should be reliably electrically contacted and a low and constant transition resistance should exist between the tensile carriers and the monitoring device. Another object of the invention is to provide a method for monitoring the state of tensile carriers in a support means, wherein the tensile carriers can be reliably electrically contacted and in which method a low and constant transition resistance exists between the tensile carriers and the monitoring unit. Furthermore, the method should allow a simple connection of the support means to the monitoring device.

In order to solve the object, a support means for an elevator installation is proposed, which support means has a plurality of tensile carriers arranged parallel to one another and a jacket. The tensile carriers are surrounded by a jacket and extend along the longitudinal axis of the support means. In a section of the longitudinal axis of the support means, the tensile carriers are at least partially exposed from the casing. On the segments, contact elements for electrical contact with the tension carriers are permanently fixed on the tension carriers.

Such a support means has the advantage that the tension carriers already have contact elements for electrical contact with the tension carriers, so that the contact elements only have to be connected to the monitoring device when the support means is installed in the elevator installation. Thus, it is no longer necessary: as is the case in the prior art, electrical contact is made to the tensile carriers when the support means are installed in the elevator installation. This considerably simplifies the assembly of the monitoring system for the support means in the elevator installation. Furthermore, by means of the contact elements fixed on the tension carriers, it is ensured that: a stable electrical connection to the tensile carriers can be established and a low and constant transition resistance from the tensile carriers to the monitoring device can be ensured. The low and constant transition resistance allows a reliable monitoring of the tensile carriers over their entire service life in the elevator installation.

In an advantageous embodiment, the tensile carriers emerge from the casing at the section of the longitudinal axis of the support means. This has the following advantages: the contact elements can be better fixed on the tension carriers.

In an advantageous embodiment, the section is 5 to 100mm, preferably 5 to 50mm, particularly preferably 5 to 25 mm. This dimensioning of the segments enables a staggered arrangement of the contact elements and can also be set such that: the tensile carriers of the support element are not exposed unnecessarily on the longer segments. When the segmentation is chosen too large, there is additionally a risk that: the tension carriers bend over the segments, which may cause adjacent tension carriers to undesirably touch each other.

In an advantageous embodiment, the segments are arranged in the vicinity of the ends of the support means, so that on both sides of the segments, support means sections with uncoated tensile carriers adjoin the segments. This arrangement of the segments has the following advantages: the tensile carriers are held in their set position on both sides of the segments by the jacket. Thereby preventing: the tension carriers are strongly bent over the segments and electrical bridging takes place between the tension carriers.

In an alternative embodiment, the segments are arranged directly at one end of the support means, so that the support means segments with the uncoated tensile carriers adjoin the segments only on one side of the segments. This arrangement of the segments has the following advantages: the sheath can be removed more simply for the segment. The casing can be broken at the intended location, for example, and pulled off the tensile carriers.

The contact element is permanently connected to the tension carrier. This has the following advantages: the contact elements are not lost during storage, transportation and installation of the carrying mechanism. For a permanent connection, the following connections are understood in this context: the connection cannot be separated without great effort. Thus, the contact elements penetrating into the tension carriers do not form a permanent connection, since the contact elements can be pulled out of the tension carriers without a great force. The contact elements welded to the tension carriers accordingly form a permanent connection, since the welded components cannot be separated from one another by material locking without great effort.

In an advantageous embodiment, the contact element at least partially surrounds the tension carrier. This has the following advantages: by means of such an enclosure, a larger contact surface and thus a more reliable electrical connection between the contact element and the tension carrier is produced, and a lower transition resistance between the tension carrier and the contact element can also be achieved.

In an advantageous embodiment, the contact elements are soldered, welded, glued to the tension carrier or are held deformed by mechanical action and are thereby fixed to the tension carrier. This in turn has the following advantages: the contact elements are reliably connected to the tensile carriers, so that a stable electrical connection with a low and constant transition resistance can be ensured.

In an advantageous embodiment, the contact element projects substantially perpendicularly to the longitudinal axis of the support means. In an advantageous development, the contact element also projects approximately perpendicularly to the tension side of the support means. This has the following advantages: the contact elements projecting in this way from the tension carrier can be easily reached and can be connected, for example, to a plug attached to the support means.

In an alternative embodiment, in which the segments are arranged directly on one end of the support means, the contact elements project substantially in the direction of the tension carrier. This arrangement of the contact elements has the following advantages: so that the contact element can be sampled in the extension of the carrier. Depending on the installation behavior in the elevator installation, this can be advantageous in relation to the radial contact.

In an advantageous embodiment, the section is located in a region of the support means which, in the use state in the elevator installation, is not loaded by the weight of the car or the counterweight. Thereby ensuring that: the load-bearing region of the load-bearing means is completely covered by the sheath and is therefore less vulnerable to damage.

In an advantageous embodiment, the first section is arranged near a first end of the carrying means and the second section is arranged near a second end of the carrying means. The fact that the segments with the contact elements are arranged on both ends of the carrier respectively has the following advantages: the tensile carriers can be monitored over the entire length of the support means.

In an advantageous embodiment, a contact element is arranged on each tensile carrier of the support means. This has the following advantages: each tensile carrier of the support means can be monitored, which increases the safety of the elevator installation.

In an advantageous embodiment, adjacent contact elements are arranged offset to one another with respect to the longitudinal axis of the support means. The contact elements are arranged here, for example, in two rows, so that the contact elements are arranged alternately in a first row and a second row, respectively, from one side of the carrier to the other side of the carrier. This staggered arrangement of the contact elements has the following advantages: electrical contact between two adjacent tensile carriers can be avoided. This is advantageous in particular for support means with tensile carriers placed close to one another. Furthermore, the staggered arrangement of the contact elements results in more space for the multiple contact elements to sample.

In an advantageous embodiment, the covering element is arranged on the segment by means of the tension carriers, so that substantially only the regions of the tension carriers on which the contact elements are arranged emerge from the covering element. Such covering elements may consist, for example, of polyamide, and thus of fiber-reinforced polyamide. In an alternative embodiment, the covering element is formed from thermoplastic polyurethane, preferably from fiber-reinforced thermoplastic polyurethane. Such a covering element has the following advantages: when the support means is used in an elevator installation, the tensile carriers are also protected from the environment on the sheathed sections. Furthermore, such a cover element serves as a protective measure for the contact elements during transport of the support means and during installation of the support means in the elevator installation. The contact element is thus protected against undesired bending or crushing, for example when the support means is rolled in by the support means end connection.

The support means described here is used in the preferred embodiment in an elevator installation with a drive and a car. Here, the segments with the contact elements are arranged in the following manner: so that the segments are located in the region of the support means not loaded by the weight of the car. Here, theThe presented support means can in principle be used in various types of elevators. Thus, for example, elevators with or without counterweight and different roping systems of the car or counterweight can be considered. Thus, the support means described herein can be used in a car 2_∶1-suspension elevator installation, which can also be suspended in the car and counterweight by 1_∶1-suspension elevator installations, but can also be used in elevator installations of other types of construction.

In an advantageous embodiment, the contact element is electrically connected to a monitoring unit of the elevator installation. Such a monitoring device can, for example, check the electrical resistance of the individual tensile carriers.

In an advantageous embodiment, the contact element is formed by a galvanized metal sheet. In an advantageous development, the metal sheet is bent in the following manner: two edges are produced which in the applied state enclose the tensile carriers. In an alternative embodiment, the contact element is formed by a tin-plated metal plate or a stainless metal plate.

In order to achieve the object set forth at the outset, a method for monitoring the condition of tensile carriers in a support means is also proposed, wherein the support means comprises a plurality of tensile carriers arranged parallel to one another. The support means furthermore has a jacket, wherein the tensile carriers are enclosed by the jacket. The method comprises the following steps: exposing at least partially tensile carriers on segments of the support means; permanently fixing contact elements on exposed segments of the support means to the tensile carriers for electrical contact with the tensile carriers; loading the support means into the elevator installation; connecting the contact element with the monitoring unit; and determining an electrical characteristic value of the tensile carriers for monitoring the state of the tensile carriers.

This method has the following advantages: the contact elements can be fixed to the tension carrier before the support means is installed in the elevator installation. The support means can thus be prepared beforehand with the contact elements, which greatly simplifies the assembly of the monitoring system in the elevator installation. Furthermore, such an artificially fixed contact element enables a more reliable electrical connection to the tensile carriers to be established and ensures a lower and more constant transition resistance between the contact element and the tensile carriers.

In an advantageous embodiment, the sheathing on the segments is cut by wiping and/or by water jets when the tensile carriers are exposed. In an advantageous development, the sheathing on the segments is first brushed, then cut by the water jet and then brushed again. This exposure ensures a clean emergence of the tensile carriers from the jacket, and reliable electrical connections can be applied to the tensile carriers, characterized by a low transition resistance. Furthermore, the segments are exposed with the tolerances required here by means of this exposure method by means of wiping or water jet cutting.

In an alternative embodiment, the jacket on the segments is melted by the action of heat when the tensile carriers are exposed.

In a further alternative embodiment, the sheathing on the segments is removed by laser when the tensile carriers are exposed.

In a further alternative embodiment, the casing is cut at the intended location and then pulled off the tensile carrier. The covering can be pulled completely off the tensile carrier, whereby the exposed section is located directly on the end of the support means, or the covering cannot be pulled completely off the tensile carrier, whereby the partially pulled covering is extended at the end, whereby the exposed section is not located directly on the end of the support means.

In an advantageous embodiment, the contact elements are welded, soldered, glued to the tension carrier or are held deformed by mechanical action and are thereby fixed to the tension carrier. A contact element fixed in this way represents a reliable electrical connection with a low and constant transition resistance between the tensile carrier and the contact element.

In an advantageous embodiment, a covering element is arranged above the tension carriers before or after the fixing of the contact elements on the tension carriers, so that essentially only the regions of the tension carriers on which the contact elements are arranged emerge from the covering element. Such a covering element protects the contact element from environmental influences during operation of the elevator installation, during transport and during installation of the support means in the elevator installation.

In an advantageous embodiment, the section with the contact elements is located in the area not loaded by the weight of the car or the counterweight by installing the support means in the elevator installation. Thereby preventing: the support means is not necessarily weakened in the region in which the support is effective. In addition, vibrations of the support means which could adversely affect the electrical connection can thereby be excluded as far as possible.

For the electrical sampling of the carrier with contact elements described here, a plug with a base and a cover is also proposed.

In an advantageous embodiment, the contact element is electrically sampled by a connection element in the plug. When the plug is fixed to the carrier or the contact element, the carrier is first placed into the base together with the contact element. The support means is supported in the base in such a way that it can be moved within a narrow boundary range both in the direction along the tension carriers and in the direction transverse to the tension carriers. When the cover is then fixed to the base by means of the connecting element, the support means are correspondingly aligned in the base, and at the same time the connecting element comes into contact with the contact element in the intended manner. After the support means have been aligned in the base part and the connecting element has been brought into contact with the contact element in the intended manner, the cover and the base part are fixed against one another. By fixing the cover to the base, the connecting element is held in its set position in relation to the contact element. By means of such a plug, the contact element can be electrically sampled reliably and within a protected range.

In an advantageous embodiment, the connecting element is constructed in such a way that it makes contact with the contact element at four or more points when the connecting element makes contact with the contact element in the provided manner. This has the following advantages: by means of a higher number of contact points between the contact element and the connection element, a lower transition resistance can be achieved.

Drawings

The details and advantages of the invention are explained below with reference to the examples and with reference to the schematic drawings. Wherein:

fig. 1 shows an exemplary embodiment of an elevator installation;

FIG. 2 illustrates an exemplary embodiment of a carrier mechanism with an exposed segment;

FIG. 3 illustrates an exemplary embodiment of a carrier mechanism with an exposed segment; wherein the contact elements are arranged on the tension carriers;

FIG. 4 illustrates an exemplary embodiment of a contact element;

FIG. 5 illustrates an exemplary embodiment of a load bearing mechanism with a cover;

fig. 6 shows an exemplary embodiment of a carrier mechanism with contact elements and a plug base;

fig. 7 shows an exemplary embodiment of a carrier mechanism with contact elements and a plug top cover; and

fig. 8 shows an exemplary embodiment of a carrier with contact elements and plugs arranged thereon.

Detailed Description

The elevator installation 40 schematically and exemplarily shown in fig. 1 comprises an elevator car 41, a counterweight 42 and a support means 1 as well as a drive pulley 43 together with a corresponding drive motor 44. The drive pulley 43 drives the support means 1 and thus moves the elevator car 41 and the counterweight 42 in opposite directions. The drive motor 44 is controlled by an elevator controller 45. The car 41 is configured to receive and transport people and/or cargo between floors of a building. The car 41 and the counterweight 42 are guided along guides (not shown). In the example, the car 41 and the counterweight 42 are suspended on respective load rollers 46. The support means 1 is fixed to a first support means fixing device 47 and is then first guided around the support rollers 46 of the counterweight 42. The support means 1 is then placed by means of the drive pulley 43, guided around the support rollers 46 of the car 41 and finally connected to the fixing point by means of the second support means fixing device 47. This means that the support means 1 is operated at a higher speed relative to the movement of the car 41 or counterweight 42, corresponding to the roping factor or roping ratio, by means of the drives 43, 44. In the example the roping factor is 2_∶1。

The loose end 1.1 of the support means 1 is provided with a contact device 2 for temporarily or permanently contacting the support means 1. In the example shown, such contact devices 2 are arranged on both ends of the support means 1. In an alternative embodiment, which is not shown, only one contact device 2 is arranged at the support means end 1.1. The support means end 1.1 is no longer subjected to tensile forces in the support means 1, since these tensile forces have already been introduced into the building via the support means fastening device 47. I.e. the contact device 2 is arranged in the region of the support means 1 that is not to be rolled over.

The elevator installation 40 shown in fig. 1 is exemplary. Other roping factors and arrangements are possible, e.g. elevator installations without counterweight. The contact device 2 for contacting the support means 1 is then arranged in accordance with the arrangement of the support means fastening device 47.

Fig. 2 shows an exemplary embodiment of a support means 1 with tensile carriers 5 and a sheathing 6 for the wrapping. The tensile carriers 5 are arranged along the longitudinal axis 3 of the support means 1. In the section 4 of the longitudinal axis 3 of the support means, the tensile carriers 5 emerge from the casing 6. The support means shown in this example has longitudinal ribs on the tension side. In an alternative, not shown embodiment, the carrier means do not have longitudinal ribs.

The exposure of the tensile carriers 5 on the segments 4 can be carried out, for example, by scraping and/or water jet cutting. In the exemplary embodiment, one side of the jacket 6 is first brushed off until the tensile carriers 5 are reached. After that, the second side is likewise wiped off until the tensile carriers 5 are reached. The remaining capsule 6 on the portion 4 is then removed by water jet cutting. The water jet cutting is preferably carried out axially with respect to the longitudinal axis 3 of the support means 1 and parallel to the tensile carriers 5. The diameter of the water jet can be between 0.3mm and 0.7mm, for example. In order to completely expose the tensile carriers 5 from the jacket 6, a wiping operation can be provided again after the water jet cutting. This post-positioned wiping process ensures: the covering 6 on the section 4 is completely removed. The complete removal of the jacket 5 on the segments 4 is important for reliable electrical contact to the tensile carriers 5 via the contact elements 8.

In fig. 3, the same support means 1 as in fig. 2 is shown. Here, the contact elements 8 are fixed to the tension carriers 5 on the exposed segments 4. In this exemplary embodiment, the contact elements 8 are arranged offset to one another with respect to the longitudinal axis 3 of the support means 1. Thereby preventing: adjacent contact elements 8 touch and thus form an electrical bridge between adjacent tension carriers 5.

An exemplary contact element 8 is shown in fig. 4. The contact element 8 may be formed from a galvanized steel sheet which is correspondingly bent. The curved arms of the contact elements 8 serve to sandwich the tension carriers 5 for establishing a reliable electrical contact between the contact elements 8 and the tension carriers 5. The contact elements 8 can be connected to the tensile carriers 5 by spot welding, for example, using a laser at 2 to 4 points.

Fig. 5 shows the same support means 1 as in fig. 3, but here a cover element 9 is arranged on the exposed section 4. The covering element 9 can be made of polyamide, preferably fiber-reinforced polyamide, for example. The cover element 9 can expose the contact element 8 to the following extent: so that the contact element can be contacted by the plug in a simple manner. At the same time, the covering element 9 protects the contact element 8 from mechanical loads and also protects the exposed tensile carriers 5 from environmental influences.

Fig. 6, 7 and 8 show an exemplary support means 1 with a contact element 8 and a plug 10. Fig. 8 shows the complete plug 10, fig. 6 only shows the base 11 of the plug 10, and fig. 7 only shows the top cover 12 of the plug 10. In order to be able to reliably electrically sample the contact element 8, a connection element 15 is provided. When the plug 10 is connected to the contact element 8, the support means 1 can be placed, for example, first in the seat 11. The support means 1 is mounted in the base 11 so as to be movable within narrow limits in the direction along the tension carriers 5 and transversely to the tension carriers 5. When the cover 12 is now fastened to the base 11 with the connecting element 15, the support means 1 is correspondingly aligned in the base 11, while at the same time the connecting element 15 comes into contact with the contact element 8 in the intended manner (the connecting element 15 is shown without the cover 12 in fig. 6 for better illustration). After the respective alignment of the support means 1 in the base 11 and the contact of the connecting element 15 with the contact element 8 in the set manner, the cover 12 is screwed onto the base 11. The plug 10 applied to the carrier 1 protects the exposed carrier end 4 and electrically samples the contact element 8. The plug 10 may then be electrically connected to a monitoring unit (not shown).

The plug 10 shown in fig. 6 to 8 forms an exemplary contact arrangement 2 together with the contact element 8, as is shown schematically in fig. 1.

Claims (14)

1. A support means (1) for an elevator installation, the support means (1) comprising: a plurality of tension carriers (5) and a jacket (6) arranged parallel to one another, wherein the tension carriers (5) are enclosed by the jacket (6) and the tension carriers (5) extend along a longitudinal axis (3) of the support means (1), wherein the tension carriers (5) are at least partially exposed from the jacket (6) on a section (4) of the longitudinal axis (3) of the support means (1), and wherein contact elements (8) for electrically contacting the tension carriers (5) are permanently fixed to the tension carriers (5) on the section (4), wherein at least one contact element (8) is arranged on each tension carrier (5) of the support means (1), wherein adjacent contact elements (8) are arranged offset from one another with respect to the longitudinal axis (3) of the support means (1), wherein the contact elements are arranged in two rows, such that the contact elements are alternately arranged in a first row and a second row, respectively, from one side of the carrier to the other side of the carrier.

2. The support means (1) according to claim 1, wherein the contact elements (8) are soldered, welded, glued to the tension carrier (5) or held deformed by mechanical action and in turn fixed to the tension carrier (5).

3. The support means (1) according to claim 1 or 2, wherein the contact element (8) projects substantially perpendicularly to the longitudinal axis (3) of the support means (1) and/or substantially perpendicularly to the tension side of the support means (1).

4. The support means (1) according to claim 1 or 2, wherein on the segments (4) a covering element (9) is arranged above the tension carriers (5), so that essentially only the regions of the tension carriers (5) on which the contact elements (8) are arranged are exposed from the covering element (9).

5. The carrier (1) according to claim 1 or 2, wherein the segments (4) are 5mm to 100mm measured in the direction of the longitudinal axis (3) of the carrier (1).

6. The carrier (1) according to claim 5, wherein the segments (4) are 5mm to 50 mm.

7. The carrier (1) according to claim 6, wherein the segments (4) are 5mm to 25 mm.

8. An elevator installation (40) having a support means (1) according to any one of claims 1-7.

9. Method for monitoring the condition of tensile carriers (5) in a support means (1), wherein the support means (1) comprises a plurality of tensile carriers (5) arranged parallel to one another and a jacket (6), wherein the tensile carriers (5) are surrounded by the jacket (6), comprising the following steps:

exposing the tension carriers (5) at least partially on the segments (4) of the support means (1);

permanently fixing contact elements (8) on the tensile carriers (5) on exposed segments (4) of the support means (1) for electrically contacting the tensile carriers (5), wherein at least one contact element (8) is arranged on each tensile carrier (5) of the support means (1) and adjacent contact elements (8) are arranged offset from one another with respect to the longitudinal axis (3) of the support means (1), wherein the contact elements are arranged in two rows, such that the contact elements are arranged alternately in a first row and a second row from one side of the support means to the other side of the support means, respectively;

loading the support means (1) into an elevator installation (40);

-connecting the contact element (8) with a monitoring unit; and

determining an electrical characteristic value of the tensile carriers (5) for monitoring the state of the tensile carriers (5).

10. Method according to claim 9, wherein, when exposing the tensile carriers (5), the coating (6) on the segments (4) is wiped and/or water jet cut and/or melted and/or laser removed and/or a section of the coating (6) is at least partially pulled off the tensile carriers (5).

11. A method according to claim 9 or 10, wherein the wrap (6) on the segment (4) is first brushed, then cut by the water jet beam and then brushed again.

12. Method according to claim 9 or 10, wherein the contact element (8) is soldered, welded, glued to the tension carrier (5) or held deformed by mechanical action and thereby fixed to the tension carrier (5).

13. Method according to claim 9 or 10, wherein before or after fixing the contact elements (8) on the tension carriers (5), covering elements (9) are arranged above the tension carriers (5) such that substantially only the regions of the tension carriers (5) on which the contact elements (8) are arranged are exposed.

14. Plug (10) for electrically sampling a carrier (1) according to one of claims 1 to 7, the plug (10) comprising a base (11) and a top cover (12),

wherein the support means (1) with the contact elements (8) can be arranged in the base (11) in such a way that the support means (1) is mounted in the base (11) so as to be movable in the direction of the tension carriers (5) and in a direction transverse to the tension carriers (5), and

the cover (12) has a connecting element (15) and can be arranged on the base (11) in such a way that the support means (1) can be aligned in the base (11) while at the same time the connecting element (15) is in contact with the contact element (8) in the set manner, and

the cover (12) and the base (11) can be fixed next to one another in such a way that the connecting element (15) is held in the set position thereof in relation to the contact element (8).