Device for fastening a headrest of a vehicle seat to a backrest of the vehicle seat and vehicle seat

Abstract

The present invention relates to a device for fastening a headrest of a vehicle seat to a backrest of the vehicle seat, comprising: a first guide unit, which is used to receive a part of a first headrest column in a vertically adjustable manner; a second guide unit, which is used to receive a part of a second headrest column in a vertically adjustable manner; a first receiving unit, which is fixed or fixable on the backrest, and a sleeve-shaped part of the first guide unit is at least partially received in the first receiving unit; a second receiving unit, which is fixed or fixable on the backrest and a sleeve-shaped part of the second guide unit is at least partially received in the second receiving unit, wherein the second guide unit includes a locking mechanism for locking each vertical position of the second headrest column relative to the second guide unit, wherein at least one rib extending in the longitudinal direction is arranged on the outer side surface of each sleeve-shaped part, and wherein at least one groove is arranged on each receiving unit.

Description

Technical Field

[0001] The invention relates to a device for fastening a headrest of a vehicle seat to a backrest of the vehicle seat, comprising: a first guide unit for receiving a portion of a first headrest column of the headrest in a vertically adjustable manner; a second guide unit for receiving a portion of a second headrest column of the headrest in a vertically adjustable manner; a first receiving unit, which is fixed or fixable on the backrest and in which a bushing-shaped portion of the first guide unit is at least partially accommodated; a second receiving unit, which is fixed or fixable on the backrest and in which a bushing-shaped portion of the second guide unit is at least partially accommodated, wherein the second guide unit comprises at least one locking mechanism for locking the respective vertical position of the second headrest column relative to the second guide unit, wherein at least one rib is arranged on the outer side surface of each bushing-shaped portion, the rib extending in the longitudinal direction of the portion and over a portion of the longitudinal extension of the portion, and wherein at least one groove is arranged in each receiving unit, in which the rib of the corresponding guide unit engages in a self-locking manner.

[0002] Furthermore, the invention relates to a vehicle seat for a motor vehicle, comprising a headrest with two headrest posts and a backrest connected to the headrest. Background Art

[0003] Conventional vehicle seats for motor vehicles comprise a headrest which is fastened to the backrest of the vehicle seat via a headrest column so as to be vertically adjustable. Typically, one of the headrest columns is provided with a locking receiving device which is arranged spaced apart from one another in the longitudinal direction of the headrest column and in which, as an option, a locking element arranged on a guide unit is engaged, the guide unit being arranged on the headrest column so that the individual vertical positions of the headrest column can be optionally locked relative to the guide unit. The locking mechanism is primarily used at the same time to prevent the headrest column from being able to be pulled out of the guide unit when the locking mechanism is in the locked state. The locking mechanism can usually be released or transferred to the released state by manually activating a pressure element which is arranged on the guide unit so as to be movable. The other headrest column which does not have a corresponding locking mechanism is usually guided only in its longitudinal direction on another guide unit arranged on the backrest.

[0004] US 7 410 219 B2 relates to a fastening device for a headrest, which has two headrest columns of a vehicle seat. The fastening device comprises: a first guide bushing for receiving the first headrest column in a vertically adjustable manner; a second guide bushing for receiving the second headrest column in a vertically adjustable manner; a first receiving device, which is fixed to the backrest, in which the first guide bushing is received and rests on at least two bearing points axially spaced apart from each other; and a second receiving device, which is fixed to the backrest, in which the second guide bushing is adjustable at least in the transverse direction. The second guide bushing is placed in the second receiving device, which is fixed to the backrest.

[0005] US 9 403 456 B2 relates to a headrest support structure for a seat in transport mode. The headrest support structure includes: an upper frame, which is provided with two adaptation holes and forms a rear frame; and two cylindrical headrest mounting members, each of which is adapted in one of the two adaptation holes so as to be fixed to the upper frame. The cross-section of the adaptation portion of each headrest mounting member includes an asymmetric design around an adaptation axis parallel to the adaptation direction, wherein the headrest mounting member is adapted into the corresponding adaptation hole, the adaptation direction is the direction in which the headrest mounting member is adapted in the adaptation hole, and the cross-section is a cross-section in a direction orthogonal to the adaptation axis. The two assembly holes are implemented in such a way that each headrest mounting member is adapted in only one of the two adaptation holes, and the adaptation hole is arranged at a position determined as a fixed position of the headrest mounting member.

[0006] US 8 474 913 B2 discloses a guide bushing for a vehicle seat having a main body portion adapted to be inserted into a horizontal support of a vehicle seat arrangement. The main body portion comprises a plurality of engagement elements extending radially outwardly from a centre of the main body portion.

[0007] US 5 927 813 B2 discloses an improved arrangement for combining a headrest bracket and a mounting for use with a vehicle seat. The arrangement comprises a force-bearing member defined in the headrest bracket, a releasable anti-rotation member defined between the headrest bracket and the mounting, and a separation member defined between the bracket mounting and the lower end of the mounting. Typically, a pair of hook-shaped end members of the headrest bracket engage the engaging end of the bracket under the resistance of the releasable anti-rotation member, however, using a screwdriver or the like, a high rotational force can be received by the force-bearing member, which is applied to the mounting and is sufficient to overcome the resistance so as to release the two hook-shaped end members from the lower end of the mounting by the separation member. In this way, the headrest bracket can be easily removed from the bracket without any difficult and dangerous process.

[0008] US 7 338 130 B2 discloses a system and method for installing and removing a headrest from a seat. The system and method include provisions for installing the headrest on the seat without the use of tools and for preventing the headrest from being removed during normal operation. The system and method may also include provisions for removing the headrest by activating an internal locking device.

[0009] US Pat. No. 8,038,220 B2 discloses a vehicle headrest which is arranged to be steplessly vertically adjustable on a vehicle backrest by means of a helical spring that clamps and releases a support column of the headrest. Summary of the invention

[0010] The object of the invention is to ensure that a headrest of a vehicle seat is correctly mounted on a backrest of the vehicle seat using the simplest of means.

[0011] According to the invention, this object is achieved by the device according to the invention for fastening a headrest of a vehicle seat to a backrest of a vehicle seat, wherein the width of the rib of the first guide unit is greater than the width of the recess of the second receiving unit.

[0012] It must be pointed out that the features and measures mentioned individually in the following description can be combined together in any technically reasonable manner and demonstrate further developments of the invention. The invention is additionally characterized and specified in the description, in particular in conjunction with the drawings.

[0013] According to the invention, when mounting the headrest on the backrest, it is not possible to accidentally arrange the two first guide units on the backrest instead of the first guide unit and the second guide unit. Such an incorrect installation would be problematic in terms of safety, as in the event of an accident it would be uncertain whether the headrest would remain on the backrest. This is because the first guide unit does not include any locking mechanism as is present on the second guide unit, but only carries the first headrest column in a vertically adjustable manner. In the event of incorrect installation, the two headrest columns could easily be pulled out of the first guide unit. In addition, an incorrect installation has the disadvantage that it is not possible to lock the corresponding vertical position of the headrest relative to the backrest, which would lead to customer claims and repair costs.

[0014] Since the width of the ribs of the first guide unit is greater than the width of the recess of the second receiving unit, the ribs cannot be inserted into the recess and the first guide unit cannot be arranged on the second receiving unit, but purely on the first receiving unit. As a result, it is reliably prevented that the two first guide units are used to fasten the headrest on the backrest. The invention thus ensures the correct installation of the headrest on the backrest. Cost-intensive monitoring systems (e.g. camera monitoring, etc.) for monitoring the correct installation are not required for this purpose. The fact that the width of the first ribs of the first guide unit is greater than the width of the recess of the second receiving unit also means that the width of the ribs of the second guide unit is smaller than the width of the ribs of the first guide unit and the width of the recess of the second receiving unit is smaller than the width of the recess of the first receiving unit, otherwise it would not be possible to achieve any self-locking closure between the respective ribs and the respective recess. The ribs and the recesses simultaneously serve as an anti-rotation system for the guide unit relative to the receiving unit.

[0015] The guide units can be made partially or completely from a plastic material. The guide units can be fixed to the respective receiving units by means of a latching or clamping mechanism. Each guide unit can comprise a flange resting on the outside of the backrest, to which side of the flange a bushing-shaped portion (which can be realized in a linear manner or at a certain angle) is connected. The locking mechanism of the second guide unit is preferably further used to prevent the second headrest column from being able to be pulled out of the second guide unit. In order to remove the headrest from the backrest, the locking mechanism must then be manually transferred to the released state by means of an actuating element arranged on the second guide unit. The ribs of the first guide unit can be manufactured in an integral manner with the respective remaining guide units. In cross section, the respective ribs can have a polygonal shape or a shape that is radially rounded on the outside.

[0016] The receiving unit can be permanently fixed, for example by a material-material connection, to the inner structure of the backrest. As an alternative to this, the receiving unit can be fixed to the inner structure of the backrest in a non-destructively releasable manner, for example by a screw or rivet connection. In order to receive the bushing-like part of the corresponding guide unit in a complete or partial manner, each receiving unit can include a receiving bushing, on which at least one groove is arranged.

[0017] According to an advantageous design, two ribs extending in the longitudinal direction of the section are arranged circumferentially offset in unison with respect to one another and extend in each case over a portion of the longitudinal extension of the section, are arranged on the outer side surface of the bushing-like section of the first guide unit, wherein two recesses are arranged circumferentially offset in unison with respect to one another in a corresponding manner and one of the two ribs engages in a self-locking manner in the recess, the two recesses being arranged on the first receiving unit, and wherein the two ribs differ from one another in their respective widths. As a result, it is ensured that the first guide unit can only be arranged on the first receiving unit in a certain rotational position relative to the first receiving unit, from which point of view this also ensures a correct arrangement of the headrest on the backrest. Since the two ribs engage in the corresponding recesses in a self-locking manner and the two ribs differ from one another in their respective widths, the two recesses also differ from one another in their respective widths.

[0018] According to a further advantageous design, two ribs extending in the longitudinal direction of the section, which are arranged circumferentially offset non-uniformly relative to one another and which extend in each case over a portion of the longitudinal extension of the section, are arranged on the outer side surface of the bushing-like section of the first guide unit, wherein two grooves are arranged circumferentially offset non-uniformly relative to one another in a corresponding manner and wherein one of the two ribs engages in a self-locking manner in the grooves, which are arranged on the first receiving unit. As a result, it is ensured that the first guide unit can only be arranged on the first receiving unit in a certain rotational position relative to the first receiving unit, which in this respect also ensures a correct arrangement of the headrest on the backrest. In such a connection, the widths of the ribs or the grooves can be identical or different.

[0019] Another advantageous design provides that at least one rib comprises an insertion section, the cross-sectional area of ​​which decreases in the direction of the end of the rib, which is first inserted into the corresponding recess. As a result, it is facilitated to insert the bushing-like section of the corresponding guide unit into the corresponding receiving unit (in particular when there is a press fit between the receiving unit and the guide unit inserted therein), so that the guide unit is fixed to the receiving unit in an immovable manner. The insertion section can be realized, for example, in the shape of a ramp or in a rounded shape.

[0020] The above-mentioned object is further achieved by a vehicle seat according to the invention for a motor vehicle, which comprises at least one device according to one of the above-mentioned embodiments or at least two of the above-mentioned embodiments in any combination with one another.

[0021] The advantages described above with reference to the device also extend to the vehicle seat. The vehicle seat can be a front seat or a rear seat of a motor vehicle. The connected headrest column can be part of a support realized as one piece. In addition, the headrest column can be realized in a straight or curved manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Further advantageous designs of the invention are disclosed in the following description of the drawings, in which:

[0023] Figure 1 A schematic diagram showing an exemplary embodiment of an apparatus according to the invention;

[0024] Figure 2 Shown from different perspectives Figure 1 A schematic diagram of a second guide unit shown in ; and

[0025] Figure 3 A schematic diagram of a further exemplary embodiment of a device according to the invention is shown.

[0026] In the individual figures, identical components are always provided with the same reference symbols, which is why they are generally described only once. DETAILED DESCRIPTION

[0027] Figure 1 A schematic diagram of an exemplary embodiment of a device 1 according to the invention for fastening a headrest (not shown) of a vehicle seat (not shown) to a backrest (not shown) of the vehicle seat is shown.

[0028] The device 1 comprises a first guide unit 2 for receiving a portion of a first headrest post of a headrest (not shown) in a vertically adjustable manner. The first guide unit 2 comprises a flange 3 which can be placed against the outer side of a backrest and on one side of which a linear bushing-like portion 4 is arranged. Figure 2 As shown, through-holes (not shown) extend through the flange 3 and the sleeve-like portion 4. Two ribs 6 and 7 extending in the longitudinal direction of the portion 4 are arranged circumferentially uniformly offset relative to each other and extend in each case over a portion of the longitudinal extension of the portion 4, arranged on the outer side surface 5 of the sleeve-like portion 4 of the first guide unit 2. The two ribs 6 and 7 differ from each other in their respective widths, the width of the ribs 6 and 7 extending perpendicularly to the paper plane. Each rib 6 or 7 comprises an insert section 8 or 9, the cross-sectional area of ​​which decreases in the direction of the end of the rib 6 or 7, as shown in FIG. Figure 1 The flange 3 is arranged at an angle to the longitudinal center axis 10 of the bushing-like portion 4. Each rib 6 or 7 comprises a rectangular cross-sectional area.

[0029] Furthermore, the device 1 comprises a second guide unit 11 for receiving a portion of a second headrest column of a headrest (not shown) in a vertically adjustable manner. The second guide unit 11 comprises at least one locking mechanism (not shown) for locking various vertical positions of the second headrest column relative to the second guide unit 11. When the locking mechanism is in a locked state, the locking mechanism is also used to prevent the second headrest column from being pulled out of the second guide unit 11.

[0030] The second guide unit 11 comprises a flange 12 which can be placed against the outside of the backrest and on one side of which a linear bushing-like portion 13 is arranged. Figure 2 As shown, a through hole (not shown) extends through the flange 12 and the bushing-like portion 13. A single rib 15 extending in the longitudinal direction of the portion 13 and over a portion of the longitudinal extension of the portion 13 is arranged on the outer side surface 14 of the bushing-like portion 13 of the second guide unit 11. The rib 15 includes an insertion portion 16 having a cross-sectional area of Figure 1 The direction of the ends of the rib shown at the bottom decreases. The flange 12 is arranged at an angle to the longitudinal centre axis 17 of the bushing-like portion 13. The rib 15 comprises a rectangular cross section.

[0031] Furthermore, the device 1 comprises a first receiving unit 18, which is fixed or fixable on the backrest and in which the bushing-like part 4 of the first guide unit 2 is at least partially accommodated. Two grooves 19 and 20 are arranged on the first receiving unit 18, which are arranged to be uniformly offset relative to each other in the circumferential direction corresponding to the first guide unit 2 and in each case one of the two ribs 8 and 9 of the first guide unit 2 can engage in a self-locking manner in the two grooves 18 and 19 when the bushing-like part 4 of the first guide unit 2 is inserted into the first receiving unit 18. The two grooves 19 and 20 corresponding to the ribs 6 and 7 differ from each other in their respective width a or b, the width a being able to be smaller or larger than the width b. The first receiving unit 18 comprises a bushing part 21, on which the grooves 19 and 20 are realized.

[0032] Furthermore, the device 1 comprises a second receiving unit 22, which is fixed or fixable on the backrest and in which the sleeve-like portion 13 of the second guide unit 11 can be at least partially received. A single groove 23 is arranged on the second receiving unit 22, into which the ribs 15 of the second guide unit 11 can engage in a self-locking manner when the sleeve-like portion 13 of the second guide unit 11 is inserted into the second receiving unit 22. The width c of the groove 23 is smaller than the widths a and b of the grooves 19 and 20 of the first receiving unit 18, or smaller than the widths of the ribs 6 and 7 of the first guide unit 2. The second receiving unit 22 comprises a sleeve portion 24, on which the groove 23 is realized.

[0033] Figure 2 Shown from different perspectives Figure 1 In particular, a through hole 25 can be seen, which extends through the flange 12 and the bushing-like portion 13 of the second guide unit 11 , into which a second headrest post (not shown) can be at least partially inserted.

[0034] Figure 3 A schematic diagram of a further exemplary embodiment of a device 26 according to the invention is shown for fastening a headrest (not shown) of a vehicle seat (not shown) to a backrest (not shown) of the vehicle seat.

[0035] Device 26 and Figure 1 The exemplary embodiment shown differs in that the two ribs 28 and 29 arranged on the outer side surface 5 of the bushing-like portion 4 of the first guide unit 27 are arranged circumferentially offset non-uniformly relative to each other, and the two grooves 31 and 32 arranged on the first receiving unit 30 are arranged circumferentially offset non-uniformly, respectively. To avoid repetitions, reference is made to the above description of the embodiment of the present invention. Figure 1 and 2 Description.

[0036] Reference numerals

[0037] 1 device

[0038] 2First guide unit

[0039] 32 flange

[0040] 42 bushing-like portion

[0041] 54 outer surface

[0042] 62 ribs

[0043] 72 ribs

[0044] Insertion part of 86

[0045] Insertion part of 97

[0046] 10 4 longitudinal center axis

[0047] 11 Second guide unit

[0048] 1211 flange

[0049] The bushing-like part of 1311

[0050] The outer surface of 1413

[0051] 1511 ribs

[0052] Insertion of 1615

[0053] The longitudinal center axis of 1713

[0054] 18 First receiving unit

[0055] 1918 Groove

[0056] Groove of 2018

[0057] Bushing part of 2118

[0058] 22 Second receiving unit

[0059] 2322 groove

[0060] Bushing part of 2422

[0061] 2513 through hole

[0062] 26 devices

[0063] 27First guide unit

[0064] 2827 ribs

[0065] 2927 ribs

[0066] 30 First receiving unit

[0067] 3130 groove

[0068] 3230 groove

Claims

1. A device (1, 26) for fastening a headrest of a vehicle seat to a backrest of the vehicle seat, characterized in that The device comprises: a first guide unit (2, 27), the first guide unit (2, 27) being used to receive a portion of a first headrest column of the headrest in a vertically adjustable manner, a second guide unit (11), the second guide unit (11) being used to receive a portion of a second headrest column of the headrest in a vertically adjustable manner, a first receiving unit (18, 30), which is fixed to the backrest and in which the bushing-like part (4) of the first guide unit (2, 27) is at least partially accommodated, a second receiving unit (22), which is fixed to the backrest and in which the bushing-shaped part (13) of the second guide unit (11) is at least partially accommodated, Wherein, the second guide unit (11) comprises at least one locking mechanism, which is used to lock each vertical position of the second headrest column relative to the second guide unit (11). wherein at least one rib (6, 7, 15, 28, 29) extending in the longitudinal direction of the bushing-like portion (4, 13) and over a part of the longitudinal extension of the bushing-like portion (4, 13) is arranged on the outer side surface (5, 14) of each bushing-like portion (4, 13), wherein at least one groove (19, 20, 23, 31, 32) is arranged on each receiving unit (18, 22, 30), the rib (6, 7, 15, 28, 29) of the corresponding guide unit (2, 11, 27) engaging in a self-locking manner in the at least one groove (19, 20, 23, 31, 32), The width of the ribs (6, 7, 28, 29) of the first guide unit (2, 27) is greater than the width (c) of the groove (23) of the second receiving unit (22), Two ribs (6, 7 or 28, 29) extending in the longitudinal direction of the bushing-like portion (4) are arranged circumferentially offset in unison or incongruence with respect to each other and both extend over a portion of the longitudinal extension of the bushing-like portion (4) and are arranged on the outer side surface (5) of the bushing-like portion (4) of the first guide unit (2, 27), and The two grooves (19, 20 or 31, 32) are arranged in a corresponding manner to be circumferentially offset in agreement or in disagreement with each other, and one of the two ribs (6, 7 or 28, 29) engages in a self-locking manner in one of the two grooves (19, 20 or 31, 32), which are arranged on the first receiving unit (18, 30).

2. The device (1) according to claim 1, It is characterized in that In the case of a uniform offset, the widths (a, b) of the two grooves (19, 20) are respectively different from one another.

3. The device (1, 26) according to claim 1, It is characterized in that At least one rib (6, 7, 15, 28, 29) comprises an insertion portion (8, 9, 16) whose cross-sectional area decreases in the direction of the end of the rib (6, 7, 15, 28, 29) which is first inserted into the corresponding groove (19, 20, 23, 31, 32).

4. A vehicle seat for a motor vehicle, comprising a headrest having two headrest posts and a backrest connected to the headrest, It is characterized in that At least one device (1, 26) according to one of claims 1 to 3 is provided.

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