DE102018103093B4 - VEHICLE SEAT FOR A MOTOR VEHICLE - Google Patents

Abstract

Vehicle seat (1) for a motor vehicle, comprising a seat back (2) which is coupled to a height-adjustable and tiltable headrest (3) via at least one telescopic element (5a), the headrest (3) being between a substantially vertical unfolded position and a substantially horizontal folded position, characterized in that - a) the at least one telescopic element (5a) is axially displaceable and/or telescopic by means of a drive unit (6), wherein at least the first actuating device (4a) the headrest (3) can be actuated by axially displacing and/or telescoping the at least one telescopic element (5a) in order to tilt and/or axially displace the headrest (3) between the vertical unfolded position and the horizontal folded position;- b1) the Vehicle seat (1) has two telescopic elements (5a, 5b) with a respective first guide rod (15a, 15b) and respective first actuating devices (4a, 4b) arranged thereon on the headrest side, the first guide rods (15a, 15b) in a respective first and second Guide element (7a, 7b, 8a, 8b) are guided at least axially, the two second guide elements (8a, 8b) having a respective receiving groove (9) for at least partially receiving a locking bolt (11) arranged on the respective first guide rod (15a, 15b). ), as well as a respective deflection recess (10) for guiding the respective first guide rod (15a, 15b) during a lateral deflection, the headrest (3) having a first rolling surface (28a) and the seat back (2) having a second rolling surface (28b). for the lateral deflection of the two first guide rods (15a, 15b) along the respective deflection recess (10) by rolling the headrest (3) on the second rolling surface (28b); or- b2) the vehicle seat (1) has two telescopic elements (5a, 5b), each with a first and a second guide rod (15a, 15b, 18a, 18b), with the respective first on the headrest side of the respective second guide rod (18a, 18b). Actuating device (4a, 4b), consisting of a respective rotary rod (26a, 26b), is arranged, the guide rods (15a, 15b, 18a, 18b) being guided at least axially in at least one first guide element (7a), the telescopic elements ( 5a, 5b) have a respective second actuating device (21a, 21b), consisting of at least one respective rotating rod (23a, 23b), the respective rotating rod (23a, 23b) being rotatable at a first distal end about a respective axis of rotation (22a, 22b) is arranged and is articulatedly coupled to the respective first and second guide rods (15a, 15b, 18a, 18b) via a respective first and second joint rod (24a, 24b, 25a, 25b), and wherein the respective second joint rod ( 25a, 25b) rotates with a greater lever length about the respective first axis of rotation (22a, 22b) than the respective first joint rod (24a, 24b).

Description

Technical area

The present invention relates to a vehicle seat for a motor vehicle, comprising a seat back which is coupled to a height-adjustable and tiltable headrest via at least one telescopic element, wherein the headrest can be tilted between a substantially vertical folded-out position and a substantially horizontal folded-in position by means of at least a first actuating device . The invention further relates to a motor vehicle with such a vehicle seat.

State of the art

From the DE 10 2009 019 348 A1 shows a front seat of a motor vehicle with a seat part, as well as a backrest and a headrest, the headrest being adjustable and coupled to the backrest. The headrest is adjustable between an operating position and a folding position by means of a headrest drive and is folded forward in the folded position in order to reduce or eliminate the obstruction of a rear passenger's view due to the headrest when installed.

The DE 10 2014 205 457 A1 shows a headrest for a vehicle seat. A holding rod is arranged on one side of the headrest and is arranged in a bearing holder of a backrest of the vehicle seat. The bearing holder forms a threaded connection with the holding rod. Using a motor, the holding rod can be moved up and down within the bearing holder. The holding rod is also composed of two rod parts that are connected to each other via a swivel joint. As soon as the swivel joint is arranged outside of the bearing holder, one rod part can be bent relative to the other rod part, thereby folding the headrest backwards.

The WO 2016/086907 A1 shows a foldable headrest. Two headrest rods are attached to the headrest, the headrest rods having respective bolt joints. If the headrest rods have been moved up so far that the bolt joints protrude from a guide of a vehicle seat back, the headrest rods can be folded down together with the headrest.

The DE 36 05 774 A1 shows a foldable headrest for a vehicle seat. Rods are arranged on the headrest and consist of an upper and lower rod section. The rod sections are connected to one another by respective swivel joints. If the rods are moved up so far that the swivel joints are arranged outside of respective guide sleeves, the upper rod sections can be folded down together with the headrest.

Description of the invention

An object of the invention is therefore to further develop a vehicle seat for a motor vehicle using the simplest possible structural means in such a way that the headrest can be tilted evenly and, in particular, to ensure a high level of safety for the vehicle occupant. The task is solved by the subject matter of independent claim 1. Advantageous developments of the invention are specified in the dependent claims, the description and the accompanying figures.

A vehicle seat according to the invention for a motor vehicle comprises a seat back which is coupled via at least one telescopic element to a height-adjustable and tiltable headrest, wherein the headrest can be tilted between a substantially vertical folded-out position and a substantially horizontal folded-in position by means of at least a first actuating device, at least a telescopic element is axially displaceable and/or telescopic by means of a drive unit, wherein at least the first actuating device of the headrest can be actuated by the axial displacement and/or telescoping of the at least one telescopic element in order to tilt the headrest between the vertical unfolded position and the horizontal folded position and/ or to shift axially. The headrest is connected to the seat back via one, preferably two, telescopic elements and is designed to be both height-adjustable and tiltable. A height adjustment of the headrest is preferably accompanied by a tilting of the headrest. In other words, a height adjustment and a tilting of the headrest take place simultaneously, with both the height adjustment and the tilting taking place in a uniform sequence of movements. Tilting the headrest means folding or folding the headrest backwards away from a vehicle occupant, whereby in particular the field of vision for the vehicle occupant can be expanded. The vertical fold-out position is the basic position of the headrest or the starting position of the vehicle seat. It occurs in particular during normal and manual driving operation of the motor vehicle, in which a vehicle driver controls the motor vehicle at least partially manually. The driver's line of sight is essentially aligned in the direction of travel of the motor vehicle.

The horizontal folding position of the headrest is essentially intended for at least partially autonomous driving, in particular for fully autonomous driving of the motor vehicle. The headrest is therefore tilted by 90 degrees in the folded position compared to the unfolded position. The driver can devote himself to tasks other than driving the vehicle. It is also possible for the vehicle driver to change his sitting position and rotate his body posture so that he can at least make lateral eye contact with the front passenger and/or the rear passengers on a rear seat of the motor vehicle. The tilted headrest therefore changes and expands the feeling of space and the field of vision of the vehicle occupant.

The headrest preferably has a side element in order to provide additional support for the head of the vehicle occupant in the horizontal folded position of the headrest. In the unfolded position, the side element is essentially aligned laterally next to the seat back and is not used or only partially used by the vehicle occupant. In addition, the side element can also be designed and shaped in the unfolded position in such a way that it offers passive occupant protection in the event of a side impact. Furthermore, the side element can be used as a side privacy screen. By tilting it from the unfolded position into the folded position, the use of the headrest is changed, with the headrest serving in particular as an armrest in the folded position. The shape of the side element of the headrest in the folded position increases not only safety but also the ergonomics and seating comfort for the vehicle occupant, in that the side element in the folded position serves as an alternative headrest during at least partially autonomous driving and thus safety, for example in the event of a side impact on the motor vehicle elevated. In addition, at least one airbag can be provided in the headrest, which offers sufficient protection for the vehicle occupant both in the unfolded position and in the folded position in the event of, in particular, a side impact and also in the event of a frontal impact.

According to a first alternative, the vehicle seat according to the invention has two telescopic elements with a respective first guide rod and respective first actuating devices arranged thereon on the headrest side, the first guide rods being at least axially guided in a respective first and second guide element, the two second guide elements having a respective receiving groove for at least partial accommodation of a locking bolt arranged on the respective first guide rod, as well as a respective deflection recess for guiding the respective guide rod in the event of a lateral deflection. The guide elements are preferably arranged in a stationary manner on the back of the seat back and are installed within a panel of the seat back and are therefore not visible to the vehicle occupant. The respective first guide element serves exclusively for the axial guidance of the guide rods, with the respective second guide element serving both for axial guidance and for guidance in the event of a lateral deflection. In addition, the headrest has a first rolling surface and the seat back has a second rolling surface for lateral deflection of the two first guide rods along the respective deflection recess by rolling the headrest on the second rolling surface.

The respective first guide rod is driven by the drive unit, which in this case is designed, for example, as an electric screw drive, and is displaced axially along the seat back, with the two first guide rods being displaced axially to the same extent. The respective first guide rods can therefore be moved parallel to the seat back and thus adjust the height of the headrest. Both guide rods can be driven by a common drive unit. However, it is also conceivable that each guide rod has a separate drive unit, which can be controlled and/or regulated, for example, via a control unit, so that a simultaneous actuation for axial displacement of the guide rods takes place.

The telescopic elements can alternatively also be designed to be telescopic. The term telescopic means that the respective telescopic element has several telescopic segments that are designed to be pushed into one another or extendable. Therefore, there is no axial displacement of the respective telescopic element, but rather the respective telescopic telescopic element is moved out. In this case, the drive unit is designed in such a way that the telescopic elements are extended or telescoped to tilt the headrest and change the distance between the headrest and the seat back. The telescopic elements are connected to the respective first actuating device on the headrest side in order to operate the tilting of the headrest. The respective first actuating device is arranged at the headrest-side axial end of the telescopic elements, with the headrest being tilted by actuating the respective first actuating device.

When the headrest is moved, the two telescopic elements are displaced axially downwards evenly and at the same time, so that the headrest sinks vertically downwards, but is still arranged upright. The vertical displacement of the headrest is limited by the seat back, with the headrest coming into contact with the seat back at the end of the displacement process. The headrest has a first rolling surface and the seat back has a second rolling surface, with the first rolling surface coming into contact with the second rolling surface at the end of the displacement process. The displacement process is then followed by a rolling process of the headrest. The two guide rods of the two telescopic elements are further displaced axially, i.e. vertically, downwards.

Preferably, the respective first actuating device has at least one tension spring at the headrest-side end of the respective first guide rod in order to bias a distal end piece of the respective guide rod into a recess within the headrest, the at least one tension spring being on the one hand on a first cross bolt on the respective first guide rod and on the other hand is arranged on a second cross bolt on the headrest. In other words, to initiate the rolling process of the headrest, the distal end piece is pulled out of the recess within the headrest by the axial displacement of the first guide rods, with the at least one tension spring being axially prestressed. This releases a positive connection between the telescopic elements and the headrest, so that the headrest can roll with the first rolling surface over the second rolling surface during the rolling process. The two rolling surfaces are shaped in such a way that the headrest tilts or rolls backwards evenly starting from the respective vehicle occupant. In other words, the two rolling surfaces are curved.

Furthermore, the respective first actuating device is actuated by the axial displacement of the first guide rods, with a respective locking pin arranged on the respective first guide rod being led out of the receiving groove of the respective second guide element, the locking pins releasing a positive connection between the telescopic elements and the respective second guide element and thus releasing and enabling a lateral deflection of the guide rods during the unrolling process of the headrest.

During the rolling process, the telescopic elements or the first guide rods are deflected laterally, which is essentially guided through the respective deflection recess in the respective second guide element. In other words, the respective guide rod tilts backwards during the lateral deflection, so that the headrest can roll on the second rolling surface. The respective second guide element further has at least one return spring, which is prestressed when the first guide rods are deflected laterally and relaxes again when the first guide rods are displaced in the opposite direction and moves the respective first guide rod into a starting position, the respective first guide rod then being parallel again aligned with the seat back.

The respective first actuating device preferably also has at least one torsion spring, which is intended to bias the headrest during tilting from the vertical folded-out position into the horizontal folded-in position. In other words, the at least one torsion spring is pretensioned over the second rolling surface during the rolling process of the headrest. The at least one torsion spring is therefore maximally relaxed in the unfolded position of the headrest and maximally prestressed in the folded position of the headrest. For even distribution of force, the respective first actuating device preferably has two torsion springs. The respective torsion spring is, on the one hand, attached to the respective guide rod and, on the other hand, comes to rest slidably on a vertical sliding surface within the headrest, so that axial displacement of the respective guide rod and tilting of the headrest is possible.

According to a second alternative, the vehicle seat according to the invention has two telescopic elements, each with a first and a second guide rod, with the respective first actuating device, consisting of a respective rotation rod, being arranged on the headrest side of the respective second guide rod, the first and second guide rods being arranged in at least one first guide element are at least axially guided. In the second exemplary embodiment, the first guide element is preferably fixed in place on the seat back and is formed in one piece, with the first guide element axially guiding both the first and second guide rods of the first telescopic element and the first and second guide rods of the second telescopic element together. The respective first and second guide rods of the first telescopic element and the first and second guide rods of the second telescopic element therefore form a respective double linkage. Alternatively, the first guide element can also be designed in two or more parts. The more guide elements are arranged along the longitudinal axis of the guide rods, the more securely the telescopic elements or the guide rods are guided axially.

The respective first guide rod is articulated on the headrest side with the headrest and the respective second guide rod is articulated on the headrest side with the respective rotation rod, which in turn is articulatedly connected to the headrest. By activating the guide rods, the headrest is shifted vertically downwards axially and the headrest is tilted backwards at the same time.

According to the second alternative, the telescopic elements have a respective second actuating device, consisting of at least one respective rotating rod, wherein the respective rotating rod is arranged at a first distal end rotatably about a respective axis of rotation and is articulated to the respective first via a respective first and second joint rod and second guide rod is coupled, wherein the respective second joint rod rotates with a greater lever length about the respective first axis of rotation than the respective first joint rod. At least one of the two rotating rods can be connected to the drive unit at the first distal end, the drive unit preferably being an electric drive and setting the respective rotating rod into a rotational movement about the respective axis of rotation. Alternatively, both rotating rods can have a respective drive unit. The respective second actuating device is thus arranged on the drive side on the respective first or second guide rod, with the two rotating rods being connected in an articulated manner to the respective guide rod.

Preferably, the respective rotating rod is pivotally connected to the respective second joint rod at a second distal end, wherein the respective rotating rod is rotatably coupled to the respective first joint rod between the first and second distal ends, wherein a rotation of the respective rotating rod about the respective axis of rotation results in a tilting of the headrest from the vertical unfolded position to the horizontal folded position and vice versa. The first distal end of the rotating rod is therefore formed on the drive side and the second distal end of the rotating rod is formed on the guide rod side.

The articulated connection between the respective rotating rod and the first articulated rod has a first lever ratio and the articulated connection between the respective rotating rod and the second articulated rod has a second lever ratio. The lever ratio is to be understood as the distance between the respective axis of rotation and the respective connection point of the first or second joint rod on the rotating rod. Preferably, the first lever ratio is designed to be smaller than the second lever ratio, since the first joint rod is articulated between the first and second ends of the rotating rod. In other words, the connection point between the respective rotating rod and the associated first articulated rod moves on a first circular path and the connecting point between the respective rotating rod and the associated second articulated rod moves on a second circular path, the second circular path having a larger diameter than the first circular path, and whereby the respective axis of rotation forms the coaxial center of both circular paths. The different circular paths cause the guide rods connected to the respective joint rods to shift axially at different displacement speeds when the respective rotating rods are rotated. This leads to the headrest tilting into the folded position.

Preferably, the two telescopic elements have a respective toothed segment, with the two toothed segments meshing with one another in order to synchronize displacement of the two telescopic elements. Each of the two rotating rods has the respective toothed segment at the first distal end, i.e. on the drive side. Due to the toothed segments, it is possible that only one of the two telescopic elements is actively driven by the drive unit. The other telescopic element is driven indirectly, i.e. via the meshing toothed segments, so that the guide rods are axially displaced synchronously.

To tilt the headrest from the essentially vertical unfolded position into the essentially horizontal folded position, the first rotating rod of the first telescopic element is first actuated. The first rotating rod rotates in a first direction of rotation. The two rotating rods are initially in a starting angular position and are rotated about the respective axis of rotation up to a final angular position. The starting angular position of the rotating rod is therefore in the unfolded position of the headrest and the final angular position of the rotating rod is in the folded position of the headrest. Due to the toothed segments in mesh, the second rotating rod is rotated by the actuation in a second direction of rotation, the second direction of rotation of the second rotating rod running opposite to the first direction of rotation of the first rotating rod. In other words, the first rotating rod rotates clockwise and the second rotating rod rotates counterclockwise to the same extent.

Since the first lever ratio is designed to be smaller than the second lever ratio, when the respective rotating rod is rotated, the respective first guide rod shifts by a small amount res axial dimension than the respective second guide rod of the two telescopic elements. As a result, the headrest is lowered vertically downwards and at the same time tilts backwards through progressive rotation of the respective rotating rod. An axial displacement or tilting of the headrest therefore only occurs when the drive unit is actuated. This can prevent unwanted displacement of the headrest. Actuating the drive unit in the opposite direction leads to a rotation of the respective rotating rod from the end angular position back to the starting angular position, with the headrest being tilted back into the unfolded position and displaced vertically upwards.

The vehicle seat is used in particular in a motor vehicle, for example a passenger car or truck. One or more vehicle seats can be arranged adjacent to one another or one behind the other in the area of a vehicle rear seat. In particular, the vehicle seat according to the invention is suitable for one or more front seats of the motor vehicle in order to be able to interact with the rear passengers of the motor vehicle and make eye contact during autonomous driving.

Short character description

• 1 eine schematische Perspektivansicht eines erfindungsgemäßen Fahrzeugsitzes, wobei eine Kopfstütze des Fahrzeugsitzes in einer Ausklappstellung vorliegt,
• 2 eine schematische Perspektivansicht eines erfindungsgemäßen Fahrzeugsitzes, wobei die Kopfstütze in einer Einklappstellung vorliegt,
• 3 eine vereinfachte Perspektivdarstellung einer ersten Ausführungsform des erfindungsgemäßen Fahrzeugsitzes in der Ausklappstellung,
• 4 eine vereinfachte Perspektivdarstellung des Fahrzeugsitzes gemäß 3 während eines Verlagerungsvorganges,
• 5 eine vereinfachte Perspektivdarstellung des Fahrzeugsitzes gemäß 3 in der Einklappstellung,
• 6 eine vereinfachte Schnittdarstellung der Kopfstütze des Fahrzeugsitzes gemäß 3,
• 7 eine vereinfachte Teilschnittdarstellung einer ersten Betätigungseinrichtung innerhalb der Kopfstütze des Fahrzeugsitzes gemäß 3,
• 8 eine detaillierte Perspektivdarstellung des Fahrzeugsitzes gemäß 3, insbesondere der Sitzlehne,
• 9 eine detaillierte Perspektivdarstellung eines zweiten Führungselements des Fahrzeugsitzes gemäß 3,
• 10 eine detaillierte Perspektivdarstellung des Fahrzeugsitzes gemäß 3 während des Verlagerungsvorganges,
• 11 eine detaillierte Perspektivdarstellung des Fahrzeugsitzes gemäß 3 während eines Abrollvorganges,
• 12 eine vereinfachte Perspektivdarstellung einer zweiten Ausführungsform des erfindungsgemäßen Fahrzeugsitzes in der Ausklappstellung, und
• 13 eine vereinfachte Perspektivdarstellung des erfindungsgemäßen Fahrzeugsitzes gemäß 12 in der Einklappstellung.

Two preferred exemplary embodiments of the invention are explained below with reference to the accompanying figures. Show it:

• 1 a schematic perspective view of a vehicle seat according to the invention, with a headrest of the vehicle seat in a folded-out position,
• 2 a schematic perspective view of a vehicle seat according to the invention, with the headrest in a folded position,
• 3 a simplified perspective view of a first embodiment of the vehicle seat according to the invention in the unfolded position,
• 4 a simplified perspective view of the vehicle seat 3 during a relocation process,
• 5 a simplified perspective view of the vehicle seat 3 in the folded position,
• 6 a simplified sectional view of the headrest of the vehicle seat 3 ,
• 7 a simplified partial sectional view of a first actuating device within the headrest of the vehicle seat 3 ,
• 8th a detailed perspective view of the vehicle seat 3 , especially the seat back,
• 9 a detailed perspective view of a second guide element of the vehicle seat according to 3 ,
• 10 a detailed perspective view of the vehicle seat 3 during the relocation process,
• 11 a detailed perspective view of the vehicle seat 3 during a rolling process,
• 12 a simplified perspective view of a second embodiment of the vehicle seat according to the invention in the unfolded position, and
• 13 a simplified perspective view of the vehicle seat according to the invention 12 in the folded position.

The figures are merely schematic representations and serve only to explain the invention. Elements that are the same or have the same effect are consistently provided with the same reference numerals.

According to the 1 and 2 a vehicle seat 1 according to the invention is shown for a motor vehicle - only partially shown here. It goes without saying that two or more vehicle seats 1 can also be provided in the motor vehicle. The vehicle seat 1 in the present case comprises a seat back 2 and a height-adjustable and tiltable headrest 3. A side element 19 is formed on the headrest 3, which forms additional lateral protection for a vehicle occupant 27. Furthermore, at least one airbag can be arranged in the side element 19 or in the area of the side element 19 on the headrest 3 in order to protect the vehicle occupant 27 in the event of a side or frontal impact.

1 shows that the seat back 2 is coupled to the headrest 3 via two telescopic elements 5a, 5b. In the present case, the headrest 3 is in a folded-out position. In other words, the headrest 3 is essentially vertically aligned by the telescopic elements 5a, 5b. However, it is also conceivable that the headrest 3 and the telescopic elements 5a, 5b are designed to be inclined in order to make the vehicle seat 1 more ergonomic. In the present case, the side element 19 forms lateral protection for the vehicle occupant 27 in the shoulder area.

After 2 the headrest 3 is in a folded position. In this case, the headrest 3 is essentially aligned horizontally and is also displaced vertically downwards, that is to say in the direction of the seat back 2. The headrest 3 lies in particular on the seat back 2. This is particularly advantageous for partially or fully autonomous driving. If the headrest 3 is in the folded position, the vehicle occupant 27 can turn towards the interior of the vehicle in order to make eye contact with a front passenger and / or a rear passenger on a vehicle back seat - not shown here. The headrest 3 can be used in particular as an armrest. By tilting the headrest 3, the side element 19 stands essentially vertically upwards and serves in particular as a side headrest in order to increase the lateral protection of the vehicle occupant 27 in the event of a side impact.

In the 3 until 11 a first embodiment of the vehicle seat 1 is shown in a very simplified manner. In the first embodiment, the previously described side element 19 is not shown, although this can of course also be arranged on the headrest 3.

After the 3 until 5 The two telescopic elements 5a, 5b are designed as guide rods 15a, 15b and can be moved parallel to the seat back 2. The guide rods 15a, 15b are spaced apart from one another and aligned parallel, and are guided axially, i.e. in the longitudinal direction of the respective guide rod 15a, 15b, by a respective first and second guide element 7a, 7a, 8a, 8b. The two guide rods 15a, 15b are driven and axially displaced by a common drive unit 6. In the present case, the drive unit is designed as a screw drive 6 in order to axially displace the guide rods 15a, 15b.

A respective first actuating device 4a, 4b is arranged at the headrest-side ends of the guide rods 15a, 15b, with only the first actuating device 4a of the first telescopic element 5a being visible here for perspective reasons. By axially displacing the guide rods 15a, 15b, the respective first actuating device 4a of the headrest 3 is actuated in order to axially displace the headrest 3 and also to tilt the headrest 3 between the essentially vertical unfolded position and the essentially horizontal folded position.

According to 3 the headrest 3 is initially in the unfolded position. The headrest 3 is therefore extended to the maximum in the unfolded position. The unfolded position is used in particular during normal driving of the motor vehicle, with the viewing direction of the in 1 vehicle occupant 27 shown runs essentially in the direction of travel. At the beginning of a folding process, in which the headrest 3 is moved from the unfolded position into the folded position, a displacement process initially takes place in which the guide rods 15a, 15b are actuated in such a way that an axial displacement of the guide rods 15a, 15b including the headrest 3 downwards , that is in the direction of the seat back 2.

In 4 is shown that the displacement process of the headrest 3 is ended by the guide rods 15a, 15b being shifted downwards, that is to say in a substantially vertical direction, until the headrest 3 comes to rest on the top of the seat back 2. The displacement process of the headrest 3 can also be used to adjust the height of the headrest 3 relative to the vehicle occupant, so that the head of the vehicle occupant 27 can be placed against the headrest 3 and thus safety is increased.

After 5 After the displacement process, a rolling process is initiated, in which the headrest 3 rolls over the seat back 2. The unrolling process is particularly in the 10 and 11 described. In the present case, the headrest 3 is in the folded position at the end of the rolling process, with the guide rods 15a, 15b having been displaced maximally axially and the headrest 3 being aligned essentially horizontally. In the folded position, the headrest 3 can be used as an armrest by the vehicle occupant 27. The headrest 3 then enables direct eye contact to be made between the vehicle occupant 27 and rear passengers of the motor vehicle.

The 6 and 7 show the first telescopic element 5a with the first guide rod 15a. The second telescopic element 5b is designed analogously here. In the present case, the headrest 3 is shown during the displacement process. At the headrest-side end of the first guide rod 15a, a first actuating device 4a is arranged, which can be connected to the headrest 3 in a positive and non-positive manner. The first actuating device 4a has two tension springs 13a, 13b, the tension springs 13a, 13b being connected on the one hand to a first cross bolt 16a arranged on the first guide rod 15a and on the other hand to a second cross bolt 16b arranged within the headrest 3.

According to 7 The two tension springs 13a, 13b of the first actuating device 4a cause a constant pretension between the first guide rod 15a and the headrest 3. Furthermore the first guide rod 15a has an end piece 14, which is partially received in a recess 12 formed on the headrest 3 due to the spring preload of the two tension springs 13a, 13b. In other words, the end piece 14 is pulled into the recess 12 by the spring tension and thereby holds the headrest 3 in the unfolded position. This creates a detachable positive fit between the first guide rod 15a and the headrest 3. The positive connection is released by further axially displacing the first guide rod 15a after completion of the displacement process and thus initiating the rolling process. The headrest 3 is prevented from further displacement by the seat back 2, so that the end piece 14 is led out of the recess 12 and the positive connection between the first guide rod 15a and the headrest 3 is released. The headrest 3 is therefore unrolled on the seat back 2 during the unrolling process.

The first actuating device 4a also has two respective torsion springs 17a, 17b, which are intended to bias the headrest 3 during tilting from the vertical folded-out position into the horizontal folded-in position. The respective torsion spring 17a, 17b has a first leg 30a and a second leg 30b, the second leg 30b being firmly connected to the guide rod 15a and the first leg 30a on an in 6 shown sliding surface 29 of the headrest 3 comes into contact. During the rolling process, the headrest 3 is first released for tilting by the end piece 14 emerging from the recess 12. With a progressive axial displacement of the first guide rod 15a, the headrest 3 rolls over the seat back 2, with the headrest 3 tilting relative to the first guide rod 15a. As a result, the two torsion springs 17a, 17b are pretensioned, with the torsion springs 17a, 17b sliding with the respective second leg 30b on the sliding surface 29 within the headrest 3. The axial path for the end piece 14 to emerge from the recess 12 corresponds to the path that the respective second leg 30b slides over the sliding surface 29. Furthermore, the respective second leg 30b of the two torsion springs 17a, 17b can slide on the respective sliding surface 29 during the rolling process of the headrest 3 in order to enable unhindered tilting of the headrest 3. Only the spring preload force of the respective torsion spring 17a, 17b counteracts the tilting of the headrest 3.

According to the 8th and 9 the vehicle seat 1 is partially shown, with only the functionality of the first telescopic element 5a with the first guide rod 15a being described here. In the present case, the second telescopic element 5b is designed analogously to the first telescopic element 5a. The first guide rod 15a is guided axially along the first and second guide elements 7a, 8a, with the second guide element 8a also being provided to guide a lateral deflection of the first guide rod 15a. The lateral deflection of the first guide rod 15a enables the headrest 3 to tilt backwards during the rolling process.

After 9 the second guide element 8a of the first telescopic element 5a has a receiving groove 9 for at least partially receiving a locking bolt 11 arranged on the first guide rod 15a. The locking bolt 11 is accommodated in the receiving groove 9 when the headrest 3 is in the unfolded position. Only when the first guide rod 15a is actuated and there is an associated axial displacement is the locking pin 11 guided out of the recess 9 and thus releases a positive connection between the first guide rod 15a and the second guide element 8a, so that the lateral deflection of the guide rod 15a including the headrest 3 can be done. For this purpose, the second guide element 8a has a respective deflection recess 10 for guiding the first guide rod 15a during the lateral deflection from a starting position into a deflection position. The second guide element 8a further has a return spring 31, which is prestressed during the lateral deflection of the first guide rod 15a. When the first guide rod 15a is displaced in the opposite direction, the first guide rod 15a is pressed from the deflection position back into the starting position by the return spring.

Based on 10 and 11 the rolling process of the headrest 3 is described. This is already in the 3 until 9 The shifting process described is completed and the headrest 3 comes to rest with a first rolling surface 28a on a second rolling surface 28b of the seat back 2. This shows in particular 10 , whereby the headrest 3 is shown here at the end of the displacement process or at the beginning of the rolling process. The first two guide rods 15a, 15b have been displaced axially downwards in the course of the displacement process, so that the respective locking pin 11 emerges from the associated receiving groove 9 of the respective second guide element 8a, 8b in the direction of the respective first guide element 7a, 7b.

11 shows the headrest 3 during the rolling process, with the first two guide rods 15a, 15b being displaced further downwards. The shape of the adjacent rolling surfaces Chen 28a, 28b causes the headrest 3 to roll on the second rolling surface 28b during the further displacement of the two first guide rods 15a, 15b and thus the headrest 3 to tilt backwards into the essentially horizontal folded position. During the rolling process, the already described lateral deflection of the two first guide rods 15a, 15b takes place along the respective deflection recess 10.

When the two first guide rods 15a, 15b are actuated in the opposite direction, the headrest 3 rolls over the second rolling surface 28b back into the essentially vertical position, the opposite rolling process of the headrest 3 occurring in particular by relaxing the in 9 shown respective return spring 31 and those arranged in the headrest 3 and in 7 shown respective torsion springs 13a, 13b of the actuating devices 4a, 4b. Then it will be in 7 End piece 14 shown is inserted back into the recess 12 and the headrest 3 is displaced vertically upwards until the folded-out position is reached, the locking bolts 11 being guided again into the associated receiving grooves 9 in order to ensure the positive connection between the two guide rods 15a, 15b and the respective one to generate second guide element 8a, 8b.

In the 12 and 13 a second embodiment of the vehicle seat 1 is shown in simplified form. The vehicle seat 1 in the present case has two telescopic elements 5a, 5b, the first telescopic element 5a having a respective first and a second guide rod 15a, 18a and the second telescopic element 5b having a respective first and a second guide rod 15b, 18b. The respective first actuation device 4a, 4b, consisting of a respective rotation rod 26a, 26b, is arranged on the headrest side of the respective second guide rod 18a, 18b. In the present case, the first and second guide rods 15a, 15b, 18a, 18b are axially guided in a one-piece first guide element 7a, whereby the first guide element 7a can also be designed in several parts. The function of the side element 19 of the headrest 3 is already in the 1 and 2 explained in more detail.

The telescopic elements 5a, 5b further have a respective second actuating device 21a, 21b, having a respective rotating rod 23a, 23b, wherein the first rotating rod 23a is arranged at a first distal end rotatably about a first axis of rotation 22a, as well as via a respective first and second Joint rod 24a, 25a is articulated with the respective first and second guide rod 15a, 18a of the first telescopic element 5a. The second rotating rod 23b is arranged at a first distal end so as to be rotatable about a second axis of rotation 22b, and is articulatedly coupled to the respective first and second guide rods 15b, 18b of the second telescopic element 5b via a respective first and second joint rod 24b, 25b. The respective rotary rod 23a, 23b is therefore pivotally connected at a second distal end to the respective second joint rod 25a, 25b, the respective rotary rod 23a, 23b being rotatably coupled to the respective first joint rod 24a, 24b between the first and second distal ends. A rotation of the respective rotating rod 23a, 23b about the respective axis of rotation 22a, 22b causes the headrest 3 to be displaced from the vertical folded-out position into the horizontal folded-in position and vice versa.

In the present case, the first rotating rod 23a is driven by the drive unit 6. In order to effect synchronous actuation of the two telescopic elements 5a, 5b, the two rotating rods 23a, 23b each have a toothed segment 20a, 20b at the first distal end, the two toothed segments 20a, 20b being in tooth engagement with one another. Due to the toothed segments 20a, 20b which are in mesh with one another, the second rotating rod 23b can therefore be set into a synchronous rotational movement by a rotating actuation of the first rotating rod 23a, the rotational movement of the first rotating rod 23a being opposite to the rotational movement of the second rotating rod 23b. The two telescopic elements 5a, 5b are therefore axially displaced by the rotation of the rotating rods 23a, 23b. The functionality of the first telescopic element 5a is explained in more detail below.

According to 12 the headrest 3 is in the unfolded position. In other words, the first telescopic element 5a is extended to the maximum and the first rotating rod 23a is in an initial angular position. By driving the first rotating rod 23a, it rotates about the first axis of rotation 22a. The first and second guide rods 15a, 18a, guided by the first guide element 7a, are displaced axially or vertically downwards and the headrest 3 is thus lowered. On the first rotating rod 23a, the second joint rod 25a is arranged at the second distal end and the first joint rod 24a is arranged between the first and second distal ends, the first and second joint rods 24a, 25a of the first telescopic element 5a being articulated with the first rotating rod 23a and the first and second guide rod 15a, 18a are coupled. In other words, the second joint rod 25a rotates with a greater lever length about the first axis of rotation 22a than the first joint rod 24a. The joint rods 25a, 25b are designed and actuate the first and second guide rods 15a, 18a in such a way that due to the different lever lengths adjust an axial displacement of the respective associated guide rods 15a, 18a with different displacement speeds. The rotation of the first rotating rod 23a therefore results in an axial displacement of the first guide rod 15a at a first displacement speed and an axial displacement of the second guide rod 18a at a second displacement speed, the second displacement speed being higher than the first displacement speed due to the larger lever length. This results in a guided and uniform tilting of the headrest 3. The first actuating device 4a in the form of the first rotation rod 26a is also articulated to the second guide rod 18a of the first telescopic element 5a and is actuated by the axial displacement of the second guide rod 18a in order to tilt the headrest 3 to guide.

In 13 the headrest 3 is in the horizontal folded position. The first rotating rod 23a was displaced into a final angular position by the actuation by the drive unit 6. The first telescopic element 5a is therefore minimally extended and the headrest 3 is in the folded position, that is, essentially horizontally. Actuation of the drive unit 6 with associated rotation of the first rotating rod 23a in an opposite direction of rotation causes an axial displacement vertically upwards, whereby the headrest 3 is displaced vertically upwards in the reverse order and tilted back into the essentially vertical unfolded position. The height adjustment and tilting of the headrest 3 therefore takes place evenly and simultaneously.

The functioning of the second telescopic element 5b is analogous to the functioning of the first telescopic element 5a. The two telescopic elements 5a, 5b only differ in that the first telescopic element 5a is designed to be a mirror image of the second telescopic element 5b. Furthermore, only the first telescopic element 5a, in particular the first rotating rod 23a, is driven by the drive unit 6. The second telescopic element 5a, in particular the second rotating rod 23b, is actuated by the toothed segments 20a, 20b described above, the first toothed segment 20a being connected in a rotationally fixed manner to the first rotating rod 23a and the second toothed segment 20b being connected in a rotationally fixed manner to the second rotating rod 23b. The driving torque of the first rotating rod 23a is therefore transferred to the second rotating rod 23b and causes the second rotating rod 23b to rotate.

REFERENCE SYMBOL LIST

1

Vehicle seat

2

Seat back

3

headrest

4a, 4b

First actuator

5a, 5b

Telescopic element

6

Drive unit

7a, 7b

First leadership element

8a, 8b

Second leadership element

9

receiving groove

10

Deflection recess

11

Locking bolt

12

recess

13a, 13b

Tension spring

14

End piece

15a, 15b

First guide rod

16a, 16b

cross bolt

17a, 17b

Torsion spring

18a, 18b

Second guide rod

19

Page element

20a, 20b

Tooth segment

21a, 21b

Second actuation device

22a, 22b

Axis of rotation

23a, 23b

rotating rod

24a, 24b

First joint rod

25a, 25b

Second joint rod

26a, 26b

Rotary rod

27

vehicle occupant

28a, 28b

rolling surface

29

sliding surface

30a, 30b

leg

31

return spring

Claims (7)

Vehicle seat (1) for a motor vehicle, comprising a seat back (2) which is coupled to a height-adjustable and tiltable headrest (3) via at least one telescopic element (5a), the headrest (3) being between a substantially vertical unfolded position and a substantially horizontal folded position, characterized in that - a) the at least one telescopic element (5a) is axially displaceable and/or telescopic by means of a drive unit (6), wherein at least the first actuating device (4a) the headrest (3) can be actuated by axially displacing and/or telescoping the at least one telescopic element (5a) in order to tilt and/or axially displace the headrest (3) between the vertical unfolded position and the horizontal folded position; - b1) the vehicle seat (1) has two telescopic elements (5a, 5b) with a respective first guide rod (15a, 15b) and respective first actuating devices (4a, 4b) arranged thereon on the headrest side, the first guide rods (15a, 15b) in one respective first and second guide elements (7a, 7b, 8a, 8b) are at least axially guided, the two second guide elements (8a, 8b) having a respective receiving groove (9) for at least partially receiving a on the respective first guide rod (15a, 15b) arranged locking pin (11), as well as a respective deflection recess (10) for guiding the respective first guide rod (15a, 15b) during a lateral deflection, the headrest (3) having a first rolling surface (28a) and the seat back (2) having a second have a rolling surface (28b) for the lateral deflection of the two first guide rods (15a, 15b) along the respective deflection recess (10) by rolling the headrest (3) on the second rolling surface (28b); or - b2) the vehicle seat (1) has two telescopic elements (5a, 5b), each with a first and a second guide rod (15a, 15b, 18a, 18b), with the respective first on the headrest side of the respective second guide rod (18a, 18b). Actuating device (4a, 4b), consisting of a respective rotary rod (26a, 26b), is arranged, the guide rods (15a, 15b, 18a, 18b) being guided at least axially in at least one first guide element (7a), the telescopic elements ( 5a, 5b) have a respective second actuating device (21a, 21b), consisting of at least one respective rotating rod (23a, 23b), the respective rotating rod (23a, 23b) being rotatable at a first distal end about a respective axis of rotation (22a, 22b) is arranged and is articulatedly coupled to the respective first and second guide rods (15a, 15b, 18a, 18b) via a respective first and second joint rod (24a, 24b, 25a, 25b), and wherein the respective second joint rod ( 25a, 25b) rotates with a greater lever length about the respective first axis of rotation (22a, 22b) than the respective first joint rod (24a, 24b). Vehicle seat (1). Claim 1 , characterized in that the respective first actuating device (4a, 4b) has at least one tension spring (13a) at the headrest end of the respective first guide rod (15a, 15b) in order to hold a distal end piece (14) of the respective guide rod (15a, 15b). to prestress a recess (12) within the headrest (3), the at least one tension spring (13a) being on the one hand on a first cross bolt (16a) of the respective guide rod (15a, 15b) and on the other hand on a second cross bolt (16b) on the headrest ( 3) is arranged. Vehicle seat (1) according to one of the preceding claims, characterized in that the respective first actuating device (4a, 4b) further has at least one torsion spring (17a) which is intended to move the headrest (3) from the vertical unfolded position during tilting to pre-tension the horizontal folding position. Vehicle seat (1) according to one of the preceding claims, characterized in that the respective rotating rod (23a, 23b) is pivotally connected at a second distal end to the respective second joint rod (25a, 25b), the respective rotating rod (23a, 23b) is rotatably coupled to the respective first joint rod (24a, 24b) between the first and second distal ends, a rotation of the respective rotating rod (23a, 23b) about the respective axis of rotation (22a, 22b) causing the headrest to tilt from the vertical fold-out position the horizontal folding position and vice versa. Vehicle seat (1) according to one of the preceding claims, characterized in that the two telescopic elements (5a, 5b) have a respective toothed segment (20a, 20b), the two toothed segments (20a, 20b) being in toothed engagement with one another in order to allow displacement of the to synchronize both telescopic elements (5a, 5b). Vehicle seat (1) according to one of the preceding claims, characterized in that the headrest (3) has a side element (19) in order to provide an additional leaning option for a vehicle occupant in the horizontal folded position of the headrest (3). Motor vehicle with at least one vehicle seat (1) according to one of Claims 1 until 6 .

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