Mounting device for a headrest on a vehicle seat and associated vehicle seat

Abstract

The present invention relates to a fastening device for a headrest on a vehicle seat, with the possibility of adjusting the headrest along an adjustment axis (R-R') relative to the vehicle seat. The fastening device comprises a receiving space for receiving a retaining element of the headrest, a locking element (24) that is movable between a locked position and an unlocked position, an operating element (26), and a transmission mechanism (28) comprising at least one rotatable transmission element (38) that is rotatable about a rotation axis (E-E') parallel to the adjustment axis (R-R'), wherein a rotation of each transmission element (38) causes the locking element (24) to move from the locked position to the unlocked position.

Description

[0001] The present invention relates to a fastening device for a headrest on a vehicle seat and an associated vehicle seat.

[0002] A headrest for a vehicle seat generally comprises a support element, which is specifically designed to support the head of an occupant, and at least one retaining element, e.g. a fastening rod, which is attached to the seat by a fastening device.

[0003] In order to allow, in particular, height adjustment of the support element in relation to the backrest of the seat, the retaining element, e.g. a fastening rod, is translationally movable and essentially vertically attached to the backrest of the seat.

[0004] The fastening device usually also includes a locking device that makes it possible to block the translational movement of the fastening rod and thus fix the holding element in a predefined position.

[0005] In a known manner, this locking device is, for example, a locking button, which is located, in particular, at the top of the mounting rod. Alternatively, it is also known to arrange the locking device at the bottom of the mounting rod. However, such locking devices are usually formed by a complex mechanism.

[0006] Furthermore, such locking devices may, for example, rely on a vertical transmission of an operating movement between an operating element and a locking element, which entails friction risks and therefore reduces the robustness of these devices.

[0007] Alternatively, such locking mechanisms can be formed, for example, by a lever arm that is movable around a pivot point, thus allowing movement of the latch to permit free translation of the headrest.

[0008] One objective of the invention is therefore to propose a fastening device for a headrest on a vehicle seat that is robust and easy to install.

[0009] For this purpose, the invention relates to a fastening device for a headrest on a vehicle seat with the possibility of adjusting the headrest along an adjustment axis (R-R') with respect to the vehicle seat. The fastening device comprises a receiving space for receiving a retaining element of the headrest, a locking element that is movable between a locking position in which the locking element blocks the retaining element in translation along the adjustment axis, and an unlocking position in which the locking element releases the retaining element in translation along the adjustment axis, an operating element, and a transmission mechanism comprising at least one rotatable transmission element that is rotatably movable about an axis of rotation parallel to the adjustment axis, wherein the two transmission elements pivot in opposite directions of rotation.to move the locking element from the locked position to the unlocked position.

[0010] According to particular embodiments, the fastening device comprises one or more of the following features, which can occur individually or in all technically possible combinations: - The operating element is translationally movable along a translational direction perpendicular to the adjustment axis (R-R'). - The axis of rotation of each transmission element is different from the axis of adjustment. - The axis of rotation of each transmission element coincides with the axis of adjustment. - The fastening device comprises a tubular jacket that limits the receiving space, wherein each transmission element is rotatably mounted on the tubular jacket, preferably outside the tubular jacket. - The locking element is translationally movable between the locking position and the unlocking position. - The locking element is translationally movable along a translational axis perpendicular to the adjustment axis, preferably radially to the adjustment axis. - The locking element extends into the receiving space in the locking position and is released from the receiving space, or extends less into the receiving space in the unlocking position. - Each transmission element comprises a first engagement element, via which it engages with the operating element, and a second engagement element, via which it engages with the locking element. - The first engagement element and the second engagement element are spaced apart from each other along the axis of rotation of the transmission element. - The transmission mechanism comprises two transmission elements. - The two transmission elements pivot in opposite directions of rotation to move the locking element from the locked position to the unlocked position. - The fastening device includes a reset device comprising at least one elastic reset element arranged to reset the locking element from the unlocked position to the locked position.

[0011] The invention also relates to a motor vehicle seat comprising a seat backrest which is provided with a fastening device as described above for attaching a headrest to the seat backrest, wherein the receiving space is preferably formed in the seat backrest.

[0012] The invention and its advantages will be better understood by reading the following description, which is given only as a non-limiting example, and with reference to the accompanying drawings, in which: [ Fig. 1] Fig. 1 a schematic view of elements of a vehicle seat, comprising a fastening device according to the invention; [ Fig. 2] Fig. 2 a schematic side view of a fastening device according to a first embodiment of the invention; [ Fig. 3] Fig. 3 a sectional view along axis III-III of the fastening device of Fig. 2 with the locking element in the locking position; [ Fig. 4] Fig. 4 a sectional view along axis III-III of the fastening device of Fig. 2 with the locking element in the unlocked position; [ Fig. 5] [ Fig. 6] Fig. 5 and Fig. 6 sectional views of a fastening device according to the second embodiment of the invention in the locking position ( Fig. 5) and in the unlocked position ( Fig. 6) are. [ Fig. 7] [ Fig. 8] Fig. 7 and Fig. 8 sectional views of a fastening device according to the third embodiment of the invention in the locking position ( Fig. 7) and in the unlocked position ( Fig. 8) are.

[0013] Fig. Figure 1 illustrates elements of a seat 10 of a vehicle, in particular a motor vehicle.

[0014] The seat 10 includes a seat back 12 which is configured to define a support surface for an occupant seated on the seat 10 in a known manner.

[0015] The seat 10 is equipped with a fastening device 14 for attaching a headrest 16 to the seat back 12.

[0016] A headrest 16 comprises in particular a support element (not illustrated) which is specifically designed to support the head of an occupant, and at least one retaining element 18.

[0017] As in Fig. As illustrated in Figure 1, the retaining element 18 of the headrest 16 is, for example, a rod extending along a rod axis TT'.

[0018] The retaining element 18 comprises, for example, at least one slot 20 and preferably a plurality of slots 20 spaced apart from each other along the rod axis TT'.

[0019] The fastening device 14 is configured to attach the headrest 16 to the seat backrest 12 with the possibility of adjusting the headrest 16 in relation to the vehicle seat 10 along an adjustment axis RR'.

[0020] When the headrest 16 is attached to the backrest 12, the adjustment axis RR' is preferably substantially parallel to the rod axis TT' of the retaining element 18.

[0021] In particular, the adjustment axis RR' is essentially vertical when the seat 10 is fitted in a normal usage configuration in the motor vehicle.

[0022] In other words, the fastening device 14 allows for height adjustment of the headrest 16 and, in particular, the position of its support element (not illustrated).

[0023] The fastening device 14 comprises a receiving chamber 22, a locking element 24, an operating element 26 and a transmission mechanism 28.

[0024] The receiving space 22 is adapted to accommodate the retaining element 18 of the headrest 16.

[0025] In particular, the receiving space 22 is configured to allow translational movement of the retaining element 18 along the adjustment axis RR' in order to adjust the headrest 16 relative to the seat 10. The retaining element 18 is received in the receiving space 22 by being slidable along the adjustment axis RR'.

[0026] The recording chamber 22 is preferably formed in the seat backrest 12.

[0027] According to a particular embodiment, the fastening device 14 comprises a tubular sheath 30 that limits the receiving space 22.

[0028] In particular, the tubular sheath 30 extends along the adjustment axis RR' and is formed in the seat back 12.

[0029] The locking element 24 is located between a locking position that is in Fig. 2 and Fig. 3 is illustrated, and an unlocking position which is shown in Fig. As illustrated in Figure 4, it is movable.

[0030] Preferably, the locking element 24 is movable translationally along a translation axis VV' between the locking position and the unlocking position.

[0031] Advantageously, the translation axis VV' is perpendicular to the adjustment axis R-R', preferably radial with respect to the adjustment axis R-R'.

[0032] In the locking position, the locking element 24 blocks the retaining element 18 against translation along the adjustment axis R-R'.

[0033] In particular, the retaining element 18 in the locking position is not translationally movable along the adjustment axis RR' in the receiving space 22.

[0034] More precisely, in the locked position, the locking element 24 extends into the receiving space 22, thus preventing translation of the retaining element 18 into the receiving space 22.

[0035] In a particular embodiment of the invention, which is described in Fig. As illustrated in Figure 2, the locking element 24 is, for example, housed in one of the slots 20 formed in the retaining element 18 in the locking position.

[0036] In the unlocked position, the locking element 24 releases the retaining element 18 for translation along the adjustment axis RR'.

[0037] In particular, the retaining element 18 is translationally movable in the locking position along the adjustment axis RR' in the receiving space 22.

[0038] More precisely, the locking element 24 is pulled out of the receiving space 22 or extends less into the receiving space 22 in the unlocked position to allow the translation of the retaining element 18 into the receiving space 22.

[0039] The locking element 24 is formed, for example, by a cylinder extending along a cylinder axis, in particular perpendicular to the setting axis RR' and to the translation axis V-V'.

[0040] The locking element 24 has, for example, a round, square, rectangular or elongated cross-section.

[0041] Advantageously, the operating element 26 can be moved translationally perpendicular to the setting axis RR' in a translational direction DD'.

[0042] Preferably, the translation direction DD' is essentially parallel to the translation axis VV' of the locking element 24.

[0043] For example, the operating device 26 can be manually operated by an occupant to unlock / lock the retaining element 18.

[0044] In particular, as will be explained in more detail below, the translation of the control element 26 from a first position ( Fig. 3) into a second position ( Fig. 4) the translation of the locking element 24 from the locking position to the unlocking position.

[0045] The operating element 26 comprises, for example, an upper plate 32 that defines an opening 34, which preferably defines the insertion opening of the receiving chamber 22 and, in particular, of the tubular jacket 30.

[0046] Advantageously, the upper plate 32 extends in a plane perpendicular to the recording space 22.

[0047] Preferably the operating element 26 comprises at least one tab 36, preferably two tabs 36, each extending from the upper plate 32 towards the receiving space 22.

[0048] The transmission mechanism 28 comprises at least one transmission element 38.

[0049] As it is in Fig. 3 and Fig. As illustrated in Figure 4, the transmission mechanism 28 preferably comprises two transmission elements 38.

[0050] Each transmission element 38 is rotatable and in particular rotatable about a rotation axis EE' parallel to the adjustment axis R-R'.

[0051] For example, in the Fig. 3 and Fig. In the illustrated embodiment 4, each transmission element 38 is rotatably mounted on the tubular jacket 30, preferably inside the tubular jacket 30.

[0052] In the particular embodiment of the invention, which is described in Fig. 3 and Fig. As illustrated in Figure 4, the axis of rotation EE' of each transmission element 38 is different from the axis of adjustment RR'.

[0053] Preferably, each transmission element 38 is rotatably mounted via pivot elements.

[0054] In this particular embodiment, the axes of rotation EE' of the two transmission elements 38 are equidistant from the adjustment axis RR' and extend, in particular, on both sides of the retaining element 18. Preferably, each transmission element 38 comprises a first engagement element 40, via which it engages with the operating element 26, and a second engagement element 42, via which it engages with the locking element 24.

[0055] For example, in the particular embodiment which is in Fig. 3 and Fig. As shown in Figure 4, each transmission element 38 has a rod 44 extending along the axis of rotation EE' and two tabs protruding from the shaft 44, defining the first engagement element 40 and the second engagement element 42, respectively.

[0056] In this embodiment, the rod 44 of each transmission element 38 rests against, for example, the holding element 18.

[0057] Advantageously, the first engagement element 40 and the second engagement element 42 are spaced apart from each other along the axis of rotation EE' of the transmission element 38.

[0058] For example, in the special embodiment described in Fig. 3 and Fig. Figure 4 illustrates the first engagement element 40 and the second engagement element 42 at different heights along the rod 44.

[0059] In particular, the first engagement element 40 is arranged, for example, at the upper end of the rod 44, and the second engagement element 42 is arranged, for example, at the lower end of the rod 44. The upper end of the rod 44 is near the operating element 26. The lower end of the rod 44 is away from the operating element 26.

[0060] Preferably, the translation of the operating element 26 is configured to drive the rotation of each transmission element 38.

[0061] For example, the operating element 26, in particular each of its tabs 36, is displaced during the translation of the operating element 26 from its position in Fig. 3 illustrated first position in his in Fig. 4 illustrated second position configured to come into contact with each transmission element 38 and in particular to press the first engagement element 40 in order to cause the rotation of each transmission element 38 about its axis of rotation EE'.

[0062] Each transmission element 38 is further configured such that its rotation causes the locking element 24 to move from the locking position to the unlocking position.

[0063] In the Fig. 3 and Fig. In the embodiment illustrated in Figure 4, in which the transmission mechanism 28 comprises two transmission elements 38, the two transmission elements 38 pivot in opposite directions of rotation to move the locking element 24 from the locking position to the unlocking position.

[0064] For example, as in Fig. Figure 4 illustrates that each transmission element 38 is configured so that its rotation causes a rotation of the second engagement element 42, which pushes the locking element 24, thereby causing its translation from the locking position to the unlocking position.

[0065] In other words, the transmission mechanism 28 is configured to convert the translational movement of the operating element 26 from the first position to the second position into a translational movement of the locking element 24 from the locking position to the unlocking position.

[0066] Each transmission element 38 of the transmission mechanism 28 is, for example, made of plastic.

[0067] Advantageously, the fastening device 14 further comprises a resetting device 46, comprising at least one elastic resetting element 48, which is arranged to return the locking element 24 from the unlocking position to the locking position.

[0068] When the operating element 26 is moved from the second position to the first position, the elastic return element 48 in particular causes the translation of the locking element 24 from the unlocking position ( Fig. 4) into the locking position ( Fig. 3), in particular to lock the retaining element 18 in the desired position.

[0069] As in Fig. As illustrated in Figure 2, the elastic restoring element 48 is, for example, a leaf spring which is connected to the locking element 24 and rests against the retaining element 18.

[0070] Now, the fastening of the headrest 16 to the seat backrest 12 and the adjustment of the headrest 16 in relation to the vehicle seat 10 by the fastening device 14 as described above are described.

[0071] As in Fig. As illustrated in Figure 1, the retaining element 18 of the headrest 16 is inserted into the receiving space 22 and in particular into the tubular sheath 30 along the adjustment axis RR'.

[0072] Following this insertion, the locking element 24 is in the locked position. In particular, the locking element 24 is received into the receiving space 22 and, for example, into one of the slots 20 formed in the retaining element 18.

[0073] The operating element 26 is in its first position, as shown in Fig. Figure 3 illustrates this.

[0074] The headrest 16 is thus attached to the seat back 12 at a first height in relation to the vehicle seat 10.

[0075] To adjust the headrest 16 in relation to the vehicle seat 10, the control element 26 is moved from its first position to its second position along the translation direction DD' perpendicular to the adjustment axis RR', e.g. under the action of a user who operates a push button connected to the control element 26.

[0076] The aforementioned translational movement of the operating element 26 from the first position to the second position is transferred by the transmission mechanism 28 into a translational movement of the locking element 24 from the locking position to the unlocking position.

[0077] During the translation of the operating element 26 from its in Fig. 3 shown first position in his in Fig. In the second position shown in Figure 4, the operating element 26, in particular each of its tabs 36, comes into contact with each transmission element 38 and presses in particular each first engagement element 40, thereby causing the rotation of each transmission element 38.

[0078] The rotation of each transmission element 38 causes a rotation of the second engagement element 42, which pushes the locking element 24, thereby causing its displacement from the locked position to the unlocked position, as shown in Fig. 4 is illustrated.

[0079] The retaining element 18 of the headrest 16 can then be moved translationally along the adjustment axis RR' into the desired position.

[0080] Preferably, the locking element 24 then automatically returns to the locking position by means of the elastic return element 48, so that the headrest 16 is locked in the new position.

[0081] Such a fastening device 14 enables an adjustable fastening of a headrest 16 to a seat 10.

[0082] In particular, compared to the prior art, the fastening device 14 enables locking and unlocking without the use of a complex mechanism, which is mainly due to the transmission mechanism 28, which includes easily mounted transmission elements 38.

[0083] Furthermore, such a fastening device 14 is robust, in particular by reducing the risk of friction, especially by the distance between the first engagement element 40 and the second engagement element 42 of each transmission element 38.

[0084] The invention is not limited to the embodiments and variants described above.

[0085] In particular, a fastening device 14 according to a second embodiment of the invention is described below, which is Fig. 5 and Fig. Figure 6 illustrates this.

[0086] The second embodiment differs from the first embodiment only in the position of the transmission element(s) 38.

[0087] In particular, the axis of rotation EE' of each transmission element 38 is located outside the tubular shell 30 in this second special embodiment.

[0088] In particular, as it is in Fig. 5 and Fig. As can be seen in Figure 6, the rods 44 of each transmission element 38 are not in contact with the holding element 18.

[0089] This second embodiment has the advantage that it requires less space than the first embodiment.

[0090] Furthermore, a fastening device 14 according to a third embodiment of the invention is described below, which is in Fig. 7 and Fig. Figure 8 illustrates this.

[0091] The third embodiment differs from the first embodiment only by the transmission element(s) 38.

[0092] In particular, in this third special embodiment, the axis of rotation EE' of each transmission element 38 coincides with the adjustment axis RR'.

[0093] As is the case, for example, in Fig. 7 and Fig. As illustrated in Figure 8, in this embodiment each transmission element 38 comprises a first section 50 in the form of a circular arc coaxial to the retaining element 18.

[0094] Preferably, the first engagement element 40 and the second engagement element 42 each extend beyond the first section 50.

[0095] In this embodiment, the conversion of the translational movement of the operating element 26 from the first position to the second position is carried out by the transmission mechanism 28 into a translational movement of the locking element 24 from the locking position ( Fig. 7) into the unlocking position ( Fig. 8) carried out analogously to the first embodiment.

[0096] In a variant not illustrated, the control element is movable translationally along a translational direction DD' that is not perpendicular to the adjustment axis RR'.

[0097] In particular, the translation direction DD' forms an angle between 50° and 80° with the adjustment axis R-R'.

[0098] According to another variant, not illustrated, the two transmission elements 38 pivot in the same direction of rotation to move the locking element 24 from the locking position to the unlocking position.

Claims

[1] Fastening device (14) of a headrest (16) on a vehicle seat (10) with the possibility of adjusting the headrest (16) relative to the vehicle seat (10) along an adjustment axis (R-R'), the fastening device (14) comprising a receiving space (22) for receiving a retaining element (18) of the headrest (16), a locking element (24) that is movable between a locking position in which the locking element (24) blocks the retaining element (18) in translation along the adjustment axis (R-R') and an unlocking position in which the locking element (24) releases the retaining element (18) in translation along the adjustment axis (R-R'), an operating element (26) and a transmission mechanism (28) comprising at least one rotatable transmission element (38) that is rotatable about a rotation axis (E-E') parallel to the adjustment axis (R-R'),wherein a rotation of each transmission element (38) causes the locking element (24) to be moved from the locking position to the unlocking position. [2] Fastening device (14) according to claim 1, wherein the operating element (26) is translationally movable along a translational direction (D-D') perpendicular to the adjustment axis (R-R'). [3] Fastening device (14) according to claim 1 or claim 2, wherein the axis of rotation (E-E') of each transmission element (38) is different from the adjustment axis (R-R'). [4] Fastening device (14) according to claim 1 or claim 2, wherein the axis of rotation (E-E') of each transmission element (38) coincides with the adjustment axis (R-R'). [5] Fastening device (14) according to one of the preceding claims, comprising a tubular jacket (30) that delimits the receiving space (22), wherein each transmission element (38) is rotatably mounted on the tubular jacket (30), preferably outside the tubular jacket (30). [6] Fastening device (14) according to one of the preceding claims, wherein the locking element (24) is translationally movable between the locking position and the unlocking position. [7] Fastening device (14) according to claim 6, wherein the locking element (24) is translationally movable along a translational axis (V-V') perpendicular to the adjustment axis (R-R'), preferably radially with respect to the adjustment axis (R-R'). [8] Fastening device (14) according to one of the preceding claims, wherein the locking element (24) extends into the receiving space (22) in the locking position and is released from the receiving space (22) or extends less into the receiving space (22) in the unlocking position. [9] Fastening device (14) according to one of the preceding claims, wherein each transmission element (38) comprises a first engagement element (40) via which it engages with the operating element (26) and a second engagement element (42) via which it engages with the locking element (24). [10] Fastening device (14) according to claim 9, wherein the first engagement element (40) and the second engagement element (42) are spaced apart from each other along the axis of rotation (E-E') of the transmission element (38). [11] Fastening device (14) according to one of the preceding claims, wherein the transmission mechanism (28) comprises two transmission elements (38). [12] Fastening device (14) according to claim 11, wherein the two transmission elements (38) pivot in opposite directions of rotation to move the locking element (24) from the locking position to the unlocking position. [13] Fastening device (14) according to one of the preceding claims, comprising a reset device (46) comprising at least one elastic reset element (48) arranged to reset the locking element (24) from the unlocking position to the locking position. [14] Seat (10) of a motor vehicle, comprising a seat back (12) which is provided with a fastening device (14) according to one of the preceding claims for fastening a headrest (16) to the seat back (12), wherein the receiving space (22) is preferably formed in the seat back (12).

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