DE102009024156A1 - Handsfree device for vehicle, comprises microphone which is arranged on guide element partially surrounding safety belt, where guide element is arranged on guide rail which follows course corresponding to safety belt - Google Patents

Abstract

The handsfree device comprises a microphone (M1) which is arranged on a guide element (F1,F2) partially surrounding a safety belt (2). The guide element is arranged on a guide rail (F) which follows a course corresponding to the safety belt, where the guide rail is fastened to a lock tongue (1) of the safety belt. The contact elements are fastened on the lock tongue for forming other contact elements. The contact elements contact with each other in a belt lock.

Description

The The invention relates to a hands-free device for a vehicle with a seat belt on a at least partially embracing first guide element arranged first microphone.

From the DE 100 33 985 A1 a microphone holder for a hands-free device in motor vehicles is known. In this case, a microphone is attached to the safety belt. In one embodiment, the microphone is seated in a cuff secured to the upper belt deflector, through which the safety belt passes freely. The sleeve consists of two mutually displaceable sleeves, in the lower of which the microphone is seated, whose position is adjustable to the mouth of a vehicle occupant by mutual displacement of the two sleeves. In a further embodiment, the microphone is provided on a side facing the seat belt with contacts which can be brought into electrical connection with conductor wires incorporated in the safety belt in order to be connected to a telephone circuit.

In addition, from the US Pat. No. 6,438,247 B1 a holder for a microphone on a seat belt known. The holder is designed in the form of a guide element, which is arranged displaceably on the seat belt, wherein the guide element partially surrounds the safety belt or a webbing. An electrical line for supplying the microphone with electrical energy is guided on an underside of the strap.

In the published patent application DE 101 05 513 A1 is described a hands-free device for a motor vehicle, wherein the speakerphone is designed as a speaker and microphone unit and this unit is attached to the B-pillar.

Of the Invention is based on the object, a relation to the Prior art improved handsfree device for to indicate a vehicle.

The The object is achieved by the in the claim 1 specified characteristics solved. Advantageous developments The invention are the subject of the dependent claims.

at the hands-free device according to the invention for a vehicle with a microphone on a seat belt arranged at least partially encompassing guide element is, is the guide element on a guide rail, which follows a course of the safety belt, arranged, wherein the guide rail at a lock tongue of the seat belt is attached.

By the arrangement of the first guide element on the guide rail is it possible in a profitable way, an optimal Position of the first microphone, especially an optimal position to a speaker's mouth, set.

The Handsfree is suitable for example for a as a convertible vehicle running, as a high voice quality ensured even at a high ambient noise level is.

About that In addition, by the guide rail neither a Gurtaufrollvorrichtung still influenced a so-called belt tensioner, creating a security feature the seat belt is also ensured.

The Hands-free device, in particular the first microphone, is used for Telephoning with a mobile phone and / or voice control, for example, a navigation system and / or the mobile phone.

The Guide rail is preferably detachable on the Locked tongue. For this purpose, the guide rail For example, latching elements, which formed to the lock tongue Recording units correspond. Also, the guide rail for attachment via a detachable connection, z. B. a Velcro connection attached to the lock tongue be.

The Guide rail is designed such that this has at least a first guide strand, the particular preferably hollow, for example as a so-called waveguide, is trained.

In a possible embodiment of the invention Handsfree, the guide rail can also one first and a second guide strand, where at least the first guide element is arranged. For this are on the guide element or the guide elements Recesses provided through which the guide strands each passed through.

In particularly advantageous as well as expedient Way is in at least one leadership strand a signal line and / or a supply line of the microphone. Thereby the signal line and / or supply line is preferred Protected against mechanical influences, not visible and provides no obstacle when using the handsfree device represents.

Alternatively, the connection between the microphone and the mobile phone via a radio link, such as Bluetooth, off be guided. In an advantageous embodiment, only the supply voltage is conducted via an electrical contact. The microphone signal is provided via a radio link, for example via Bluetooth. In this case, an existing Bluetooth interface can be used in the vehicle without resulting in a battery or battery charging problem. As an alternative to a radio connection, an infrared connection or an inductive signal transmission can also take place. In addition, the power supply for the microphone could also be implemented inductively.

For example is the guide rail over the at least one Guide rod telescopically adjustable lengths. Ie. that the guide strand or the guide strands are retractable and extendable, whereby the optimal position at least of the first microphone is adjustable for the speaker. Particularly preferred is the guide rail despite the telescopic Length adjustability flexible in at least one direction educated.

In Another possible embodiment the microphone on the guide rail also over the guide element itself adjustable in the optimum position be. Here, the guide element on or on the Guide rail shifted. For example, this can be done a locking element may be provided, by means of which the guide element can be locked on the guide rail.

embodiments The invention will be explained in more detail with reference to drawings.

there demonstrate:

1 schematically in a perspective view of a first embodiment of the hands-free device according to the invention, wherein a first guide member on which a microphone is mounted, is arranged on a guide rail,

2 2 schematically shows a second embodiment of a hands-free device according to the invention, wherein a guide rail is formed in the form of two guide strands and additionally a loudspeaker unit is arranged by means of a second guide element,

3 schematically a third embodiment of a hands-free device according to the invention, wherein a guide element is formed from a textile material or a suitable plastic, in which at least one microphone and a speaker unit is integrated,

4 schematically the in 3 embodiment shown without loudspeaker unit,

5 schematically a in 2 shown embodiment of the guide rail without speaker unit,

6 1 schematically shows a possible embodiment of a first fixing element for fastening a guide rail to a lock tongue, wherein the guide rail has a first and a second guide strand,

7 schematically a in 6 shown first fixing element for fastening a guide rail, wherein the first fixing element is installed on a lock tongue,

8th 1 schematically shows an embodiment of a second fixing element for fastening a guide rail, which has a guide strand,

9 schematically a in 8th shown second fixing element, wherein the second fixing element is installed on a lock tongue,

10 1 schematically shows another possible embodiment of a guide rail, which has a first and a second guide strand,

11 schematically shows an electrical contacting of the hands-free device by means of contact elements on a tongue,

12 FIG. 2 schematically shows an electrical contacting of the hands-free device by means of a central plug connection on an inner side of a belt lock and a lock tongue facing the driver of the vehicle, FIG.

13 schematically an electrical contacting of the hands-free device by means of two laterally arranged on a lock tongue and a buckle connectors, and

14 schematically an embodiment of a connector.

each other corresponding parts are in all figures with the same reference numerals Mistake.

In 1 is a lock tongue 1 , which is arranged in a vehicle, not shown, shown. For a better illustration is a safety belt 2 passing through the lock tongue 1 passed through shown. The lock tongue 1 is in a not-shown buckle, which is mounted near a seat or on a seat itself, inserted and locked.

For example it is in the vehicle to run as a convertible Vehicle.

On the safety belt 2 a hands-free device is arranged in the form of a first microphone M1 fastened on a first guide element F1 which at least partially surrounds the safety belt. In this case, the first guide element F1 is designed, for example, as a clip.

When removing the seat belt 2 This is unhindered retractable, as the seat belt 2 can be guided through the first guide element F1. On the first guide element F1, the first microphone M1 is fastened in particular non-positively and / or materially. For example, the first microphone M1 is attached via a push-button connection to the first guide element F1. Alternatively, the first microphone M1 may be glued to the first guide element F1.

In an alternative embodiment can at least the first microphone M1 and the first guide element F1 be formed as a molding, creating a further use of materials for fixing at least the first microphone M1 is not required.

About that For example, at the first microphone M1, one is not closer shown operating button, in particular for accepting a telephone call, intended. In this case, a person, in particular a speaker, needs Press the control button only to the handsfree turn. This is a search for corresponding keys the mobile phone is not necessary, creating a distraction from one current traffic is avoided. A risk of an accident is reduced in an advantageous manner.

The Hands-free device is used in particular for making a call Mobile telephone and / or voice control, such as one Navigation system and / or the mobile phone.

According to the invention, the first guide element F1 is arranged on a guide rail F, which corresponds to a course of the safety belt 2 follows and on the seat belt 2 arranged lock tongue 1 is attached.

On the guide rail F is the first guide element F1 with the attached to this first microphone M1 in an optimal Position for the speaker movable and arrangeable.

The guide rail F is formed in the present embodiment of a first guide strand FS1, which is made for example of a plastic which is flexible in at least one direction. In particular, the first guide strand FS1 is flexible at least in the z-direction, so that the guide rail F is worn when the seat belt is worn 2 to a contour of a vehicle occupant, in particular the speaker adapts.

Of the first guide strand FS1 is particularly advantageous hollow, designed as a so-called waveguide. In the first Guide strand FS1 are or is particularly advantageous Way a signal line not shown and / or a supply line of the first microphone M1 is arranged.

By such an arrangement of the signal line and / or supply line of the first microphone M1, this is advantageously protected against mechanical influences. In addition, the signal line and / or supply line is or is not visible and provides no obstacle when putting on and taking off the seat belt 2 represents.

The guide rail F is in the 1 with a lower end E1 in particular centrally on the buckle 1 arranged and runs largely parallel to the seat belt 2 , For fastening the guide rail F to the buckle 1 a first holding element H1 is provided, on which the guide rail F is at least fixed non-positively.

The first holding element H1 is for example non-positively, positively and / or cohesively on the tongue 1 attached. The first holding element H1 with the guide rail F fixed thereto is, for example, on the lock tongue 1 screwed or glued. It is also conceivable that the first retaining element H1 via a hook and loop fastener connection of the tongue 1 is releasably attached. Also, the first retaining element H1 of the tongue 1 be formed.

The Guide rail F is for example telescopically lengths adjustable, whereby the first microphone M1 based on the first guide element F1 in a profitable way in the optimal position for the vehicle occupants using the hands-free device, in particular the speaker, is adjustable.

In In one possible embodiment, the first Guide element F1 for setting the optimum position of the first microphone M1 on the guide rail F displaceable be, wherein the first guide element F1 when reaching the optimal position on the guide rail F lockable is. For example, to move the first guide element F1 a not shown locking element, which on the first guide element F1 can be arranged, dissolved to the first guide element F1 with the attached to this first microphone M1 to move.

In 2 are the lock tongue 1 and the Si cherheitsgurt 2 according to the 1 shown. In the embodiment according to 2 The guide rail F, to which the first guide element F1 is fastened to the first microphone M1, has the first and a second guide strand FS1, FS2.

For fastening the first guide strand FS1 and the second guide strand FS2 to the tongue 1 are arranged on this a first holding element H1 and a second holding element H2.

At the guide rail F is the first guide element F1 with the arranged or fixed to this first microphone M1 arranged. In addition, on the guide rail F a second guide element F2 with a speaker unit LS arranged, which also uses the guide rail F is displaceable in an optimal position.

For this have the first and the second guide element F1, F2 Recesses A in the form of through holes on, through the first guide strand FS1 and the second guide strand FS2 passed through.

The second guide element F2 is in its dimensions, in particular its width, for example, chosen larger as a width of the first guide element F1.

The Speaker unit LS is z. B. in the second guide element F2 integrated. A signal line and / or supply line, not shown the speaker unit LS is in the first guide strand FS1 and / or the second guide strand FS2 arranged, whereby these are not visible and against mechanical influences is protected.

In 3 an advantageous embodiment of the hands-free device according to the invention is shown. Here, an embodiment of a guide element FE is selected which at least a first and a second guide element F1, F2 according to 1 and 2 combined. The combined guide element FE is arranged on the guide rail F, wherein the combined guide element FE is made for example of a plastic or a suitable textile.

The combined guide element FE extends as far as possible over a longitudinal extent of the guide rail F, the first and the second guide strand FS1, FS2 according to 2 having.

At the opposite the fixed lower end E1 End E2 of the guide rail F is a first fastener B1, for example, similar to a shape of the first guide element F1, arranged.

The combined guide FE has z. B. tubular Recording units AE, which may also be formed as loops can. In this case, a hose-like receiving unit AE a guide strand FS1, FS2 assigned. The guide strands FS1, FS2 pass through the tube-like receiving units AE guided, whereby the combined guide element FE is fixed.

Preferably are in the combined guide FE a first and a second microphone M1, M2 and a speaker unit LS integrated. there For example, the first microphone M1 and the second microphone M2 are so in the combined guide FE integrated by that the number of at least two microphones M1, M2 and a corresponding one Signal processing, such as beamforming, an optimal Voice quality is achieved.

About that In addition, the position of the speaker unit LS is selected such that that sound waves at least over the speaker unit LS output speech signals at least from one ear of the speakerphone receiving vehicle occupant.

4 shows an alternative embodiment of the in 3 shown combined guide element FE, wherein the first and the second microphone M1, M2 are integrated into the combined guide element FE.

in this connection For example, the speaker unit LS is part of a in the vehicle arranged audio system.

In 5 the hands-free device according to the invention is shown with the first microphone M1 attached to the first guide element F1. In this case, the first microphone M1 forms a fastening over the guide rail F according to the course of the safety belt 2 is fixed on this.

The first and the second guide strand FS1, FS2 are in this case designed such that these telescopically lengths are adjustable. In particular, when moving the first guide element F1 down, ie in the direction of the tongue 1 , Not shown links of the guide strands FS1, FS2 pushed into one another, whereby a length of the guide strands FS1, FS2 reduced.

In 6 is a first fixing element FX1 for fixing the guide rail F, which in particular has a first guide strand FS1 and a second guide strand FS2 shown. The first fixing element FX1 is designed web-shaped and serves in particular a fastening of the guide rail F to the lock tongue 1 , as in 7 is shown.

Of the first and the second guide strand FS1, FS2 are in advantageous force, positive and / or cohesive attached to the first fixing element FX1. For example, points the respective guide strand FS1, FS2 thickened, which is arranged within the first fixing element FX1. there is the respective thickening in a diameter preferably larger formed as a respective receiving unit AE1 of the first fixing element FX1.

In detail shows 7 the first fixing element FX1 in the installed state, wherein the first fixing element FX1 (dashed line) on the lock tongue 1 is installed.

In this case, the web-shaped first fixing element FX1 extends over a longitudinal extent of a belt buckle 1 arranged or fixed first device V1 for receiving the first fixing element FX1. Two recesses A in the form of through-holes are provided on the first device V1, through which the respective guide strand FS1, FS2 of the guide rail F fastened to the first fixing element FX1 is guided.

through of the first fixing element FX1 is the respective guide strand FS1, FS2 on the first device V1 for fastening the guide rail F fixed and can but at least radially around an attachment point P are moved to the first fixing element FX1.

For example, the first device V1 for receiving or fixing the first fixing element FX1 force, form and / or cohesively on the buckle 1 attached. In the present embodiment, the first device V1 via a screw on the buckle 1 arranged.

In 8th is a second fixing element FX2 for fixing the guide rail F, which in particular has a first guide strand FS1 shown. The second fixing element FX2 is for example spherical, wherein the first guide strand FS1 z. B. within the second fixing element FX1, for example, based on a thickening of the first guide strand FS1, is attached.

9 shows that in 8th illustrated second fixing element FX2 (dashed line) with attached first guide strand FS1 in the lock tongue 1 installed condition.

alternative to the spherical configuration of the second fixing element FX2 this can also be web-shaped.

For fixing the first guide strand FS1, a second device V2 is provided, which is attached to the tongue 1 force, form and / or cohesively arranged.

The first guide strand FS1 can be arranged in this prior to attachment of the second device V2, wherein the first guide strand FS1 is guided from a recess A in the form of a through hole. Subsequently, the second device V2 at the lock tongue 1 attached, for example screwed.

On the basis of in the 6 to 9 described embodiments of the attachment of the guide rail F this is advantageously protected by a rotatable mounting due to the first and the second fixing element FX1, FX2 from kinking. A buckling of the guide rail F can occur in particular when the seat belt 2 is not created and a person with her back presses the guide rail F against a seat back, not shown. The rotatable bearing acts like a hinge in such a case and thus allows a high bending angle.

In 10 an embodiment of the guide rail F with the first and the second guide strand FS1, FS2 is shown. The first and the second guide strand FS1, FS2 are laterally on the tongue 1 attached. An advantage of an arrangement with two guide rails is an increased resistance to rotation, since the belt, guided by the two guide rails, aligns in a desired position.

The first guide element F1, on which the first microphone M1 is arranged, has two recesses A, through which the guide strands FS1, FS2 are guided. At the lower end E1 of the guide rail F opposite end E2, a second fastening element B2 is arranged, by means of which the guide rail F on the seat belt 2 to be led.

The second fastening element B2, for example, also has recesses A, into which the first and the second guide strand FS1, At least extend FS2 and, for example, firmly bonded are attached by means of an adhesive.

The first guide element F1 is on the guide rail F slidable to advantageously the optimum position of the first microphone M1.

to Locking of the first guide element F1 in the optimal Position may be a not shown locking element on the first Guide element F1 and / or on the guide rail F itself be provided, which upon displacement of the first guide element F1 is solvable.

Especially Advantageously, the hands-free device according to the invention without much effort and without high material input later be installed in a vehicle.

through the hands-free device according to the invention is it is advantageously possible, a microphone M1, M2 and / or a speaker unit LS in an optimal position for a user using the hands-free device, in particular a speaker, adjust. There are a number of microphones M1, M2 and / or Speaker units LS expandable as required.

In addition, by means of the hands-free device according to the invention a safety function of the seat belt 2 advantageously not affected. A comfort of the seat belt 2 is not changed, with increased sweating under a webbing of the seat belt 2 in the area of the guide rail F is reduced because of the seat belt 2 at least slightly pressed away by the first guide element F1 from the body of the handsfree device user is applied.

Furthermore, a function of a belt tensioner, a belt tensioner and a Gurtaufrollvorrichtung the seat belt 2 not limited.

In 11 is an electrical contact of the hands-free device by means of a buckle 7 electrically contacting contact elements 6.1 and 6.2 shown. The lock tongue 1 is made of two electrically conductive, for example metallic, sections 3.1 and 3.2 formed, which congruently formed and insulating with each other, for example, materially bonded, are connected. Alternatively, the sections 3.1 and 3.2 by means of one between the sections 3.1 and 3.2 arranged plastic film to be electrically isolated from each other. At every section 3.1 and 3.2 is at least one contact point 4 arranged on which an electrical line 5 is connectable. This line 5 For example, it can be designed as a signal line and / or supply line of the microphone M1 and arranged in a further course in the hollow guide strands FS1 and / or FS2.

In the buckle 7 are contact elements 6.2 arranged such that when a latching of the tongue 1 in the buckle 7 the contact elements 6.2 the electrically conductive sections 3.1 and 3.2 to contact.

The contact elements 6 For example, tongue-shaped from an electrically conductive, resilient and flexible material, such as spring steel, formed. Due to the flexibility of the contact elements 6 is a safe electrical connection even with vibration and / or shocks possible.

In an advantageous embodiment, several, in particular two, contact elements contact 6 each of the sections 3.1 and 3.2 , which increases contact reliability and reduces the probability of failure.

The Contacting the microphone M1 is advantageously carried out by means of a conventional so-called phantom power. As phantom power is a special type of power supply for condenser microphones designated. In this case, advantageously only two wires for the power supply of the microphone M1 and the signal transmission required because a signal from the microphone M1 to a supply voltage is modulated.

In one embodiment, not shown, the tongue is 1 formed hollow inside and in a recess on the surface of the lock tongue 1 is a contact element 6.1 isolated from the remaining surface of the tongue 1 arranged. The contact element 6.1 is in an area of the lock tongue 1 arranged, which when locking the lock tongue 1 in the buckle 7 inside the buckle 7 is arranged. This contact element 6.1 is with the contact point 4 by means of an electrical connection, for example a cable, inside the lock tongue 1 connected.

In 12 is an electrical contact of the handsfree device by means of a central connector on a facing the driver of the vehicle inside the buckle 7 and the tongue 1 shown.

In this alternative embodiment of the electrical contacting of the hands-free device, the connector is a plug 8th and one to the plug 8th correspondingly formed socket 9 educated. The plug 8th is central to the inside of the lock tongue 1 arranged. The socket 9 is central to the inside of the buckle 7 arranged.

The plug 8th and the socket 9 are each arranged such that when a latching of the tongue 1 in the buckle 7 the plug connection between the plug 8th and the socket 9 will be produced. By means of this connector, the electrical contacting of the speakerphone is possible.

Not shown in detail are the plug 8th and the socket 9 for example, connected to the signal line and / or supply line of the microphone M1 and arranged in a further course in the hollow guide strands FS1 and / or FS2.

In 13 is an electrical contact of the hands-free device by means of two laterally on the lock tongue 1 and the buckle 7 arranged connectors shown.

In this alternative embodiment of the electrical contacting of the hands-free device, the connectors are each made of a plug 8th and one to the plug 8th correspondingly formed socket 9 educated. The plugs 8th are on the side of the tongue 1 arranged. The sockets 9 are on the side of the buckle 7 arranged.

The plugs 8th and the jacks 9 are each arranged such that when a latching of the tongue 1 in the buckle 7 the connectors between the plugs 8th and the jacks 9 will be produced. By means of these connectors, the electrical contacting of the speakerphone is possible.

Not shown in detail are the plug 8th and the jacks 9 for example, connected to the signal line and / or supply line of the microphone M1 and arranged in a further course in the hollow guide strands FS1 and / or FS2.

In 14 is an advantageous embodiment of in 13 pictured from the plug 8th and the socket 9 formed connector shown in more detail.

The plug 8th and the socket 9 are made of an electrically conductive, z. B. formed metallic material.

The plug 8th is corresponding to the socket 9 designed and for electrical contact in the socket 9 insertable. A lower end of the socket 9 which is the upper, open end into which the plug 8th is insertable, is opposite, is closed. At this lower end is inside the socket 9 a feather 10 arranged such that the spring force of the spring 10 on an electrically conductive plate 11 acts. The tile 11 is inside the socket 9 above the spring 10 in the direction of the plug 8th arranged and is determined by the spring force of the spring 10 to a bottom of the socket 9 inserted plug 8th pressed, whereby an electrical contact is made possible.

In a non-illustrated embodiment an electrical contacting of the handsfree device takes place contactless, for example by means of an induction connection.

In another, not shown embodiment An electrical contacting of the handsfree via Magnet.

In the embodiments with electrical induction coupling or electrical contacting by means of magnets each for power supply The microphone or loudspeaker signal can be transmitted via an infrared or wireless connection.

1

buckle tongue

2

safety belt

3.1 3.2

section

4

contact point

5

management

6.1

first contact element

6.2

second contact element

7

buckle

10

feather

11

Tile

A

recess

F

guide rail

P

attachment point

AE

tubular recording unit

FE

combined guide element

LS

Speaker unit

B1

first fastener

B2

second fastener

E1

lower The End

E2

opposite The End

F1

first guide element

F2

second guide element

H1

first retaining element

H2

second retaining element

M1

first microphone

M2

second microphone

V1

first contraption

V2

second contraption

AE1

recording unit

FS1

first guide strand

FS2

second guide strand

FX1

first fixing

FX2

second fixing

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 10033985 A1 [0002]
• - US 6438247 B1 [0003]
• - DE 10105513 A1 [0004]

Claims (17)

Hands-free device for a vehicle with a microphone (M1) mounted on a seatbelt ( 2 ) is arranged at least partially encompassing guide element (F1, F2), characterized in that the guide element (F1, F2) on a guide rail (F) corresponding to a course of the seat belt ( 2 ), is arranged, wherein the guide rail (F) on a lock tongue ( 1 ) of the seatbelt ( 2 ) is attached. Hands-free device according to claim 1, characterized in that at the lock tongue ( 1 ) first contact elements ( 6.1 ), which correspond to in a buckle ( 7 ) arranged second contact elements ( 6.2 ) are formed, wherein the first and the second contact elements ( 6.1 . 6.2 ) with a latching of the tongue ( 1 ) in the buckle ( 7 ) contact each other. Hands-free device according to claim 2, characterized in that that the electrical contact is designed as a plug connection is. Hands-free device according to one of claims 1 to 3, characterized in that the guide rail (F) on the lock tongue ( 1 ) is releasably attached. Hands-free device according to one of the claims 1 to 4, characterized in that the guide rail (F) has at least one first guide strand (FS1). Hands-free device according to one of the claims 1 to 5, characterized in that the guide rail (F) a first and a second guide strand (FS1, FS2). Hands-free device according to one of the claims 1 to 6, characterized in that the first guide strand (FS1) and / or the second guide strand (FS2) made hollow is. Hands-free device according to one of the claims 1 to 7, characterized in that in the guide strand (FS1, FS2) a signal line and / or a supply line of Microphones (M1, M2) and / or a speaker unit (LS) arranged is. Hands-free device according to one of the claims 1 to 8, characterized in that the guide rail (F) over at least one or more guide strands (FS1, FS2) telescopic length is adjustable. Hands-free device according to one of the claims 1 to 9, characterized in that the guide element (F1, F2) arranged displaceably on the guide rail (F) is. Hands-free device according to one of the claims 1 to 10, characterized in that the guide element (F1, F2) is attached to the guide rail (F). Hands-free device according to one of the claims 1 to 11, characterized in that the guide element (F1, F2) releasably attached to the guide rail (F) is. Hands-free device according to one of the claims 1 to 12, characterized in that on the guide rail (F) a speaker unit (LS) is arranged. Hands-free device according to one of the claims 1 to 13, characterized in that a combined guide element (FE) formed from a material or a suitable plastic is, wherein the first microphone (M1), the second microphone (M2) and / or the speaker unit (LS) in the combined guide element (FE) are integrated. Hands-free device according to one of claims 1 to 14, characterized in that the guide rail (F) has at least one fastening element (B1, B2), to which one end (E2) of the guide rail (F) is attached, the one at the lock tongue ( 1 ) opposite the lower end (E1). Hands-free device according to claim 1, characterized that the microphone signal wirelessly, in particular by means of radio or Infrared technology or inductively transmitted. Hands-free device according to claim 1, characterized that the power supply for the microphone is made inductively.