Adjustable headrest

Abstract

The invention relates to an adjustable headrest (1), in particular a headrest that can be adjusted according to two different directions (Z, X) that are substantially perpendicular to one another. The invention relates to a headrest for a motor vehicle, comprising one or more support rods (3a, 3b) and a headrest body (5) which can be adjusted on said support rods along a first direction (Z) and which in turn comprises a front housing (5a) and a rear housing (5b), the position of said housings relative to each other being adjustable along a second direction (X) substantially orthogonal to the first direction. The headrest comprises a single control slider (23) acting both directly on the locking elements (13a, 13b) to allow / prevent adjustment along said first direction (Z) and simultaneously on the first engagement element (19) and / or the second engagement element (21) to allow / prevent adjustment along said second direction (X).

Description

Technical Field

[0001] The present invention relates to an adjustable headrest, and in particular to a headrest whose position can be adjusted according to two different directions which are substantially perpendicular to each other.

[0002] The invention has particular, but not exclusive, application in the manufacture of head restraints for vehicle seats. Background Art

[0003] Headrests are known from the prior art, in particular for vehicle seats, which can be adjusted in two essentially mutually perpendicular directions (also called “4-way” or “4W” headrests).

[0004] In particular, the headrest comprises a headrest body whose position can be adjusted in the vertical direction, ie towards or away from the upper side of the seat back, so as to adjust the position of the headrest body according to the height of the user occupying the seat.

[0005] The position of the headrest body (or at least a portion of the headrest body) can also be adjusted in a horizontal direction substantially perpendicular to the plane of the seat back so as to move the headrest body (or at least a portion of the headrest body) closer to or further away from the head of the user occupying the seat.

[0006] According to some solutions of known type, the adjustment in the vertical direction and the adjustment in the horizontal direction are realized by separate and independent mechanisms and are performed separately from each other.

[0007] According to other solutions of known type, adjustment in the vertical direction and adjustment in the horizontal direction are performed simultaneously.

[0008] In these latter solutions, the headrest is provided with a single control element: when said control element is in the rest position, the headrest body is locked and prevented from any movement both in the vertical and horizontal directions; when the user acts on said control element to bring it from the rest position to the working position, the headrest body is unlocked and can move both in the vertical and horizontal directions, making it possible to make adjustments in both directions simultaneously. When the user releases the control element, it returns to the rest position and the headrest body is locked in the newly selected configuration.

[0009] For example, see the adjustable headrests described in documents EP 3 153 347 and US 2015 / 0203008, and the adjustable headrests described in documents DE 102010062575 and WO 2019 / 238516.

[0010] These latter two documents disclose in particular a single control element defined as a control button which, when pushed, activates a series of mechanisms which in turn unlock the movement of the headrest body relative to both the vertical and horizontal directions, thereby allowing the headrest body to be adjusted in both directions.

[0011] Furthermore, solutions are known which adjust the headrest body by means of electric motors: a first motor allows a movement of the headrest body in a vertical direction when operated, and a second motor allows a movement of the headrest body in a horizontal direction when operated.

[0012] A solution of this type is described in document CN 113 415 222, for example.

[0013] However, adjustable headrests of known type are not without disadvantages.

[0014] Overall, the adjustment mechanism of such a headrest is complex and involves a large number of components, which leads to a number of disadvantages.

[0015] Firstly, the presence of a large number of components makes the kinematic chain between the control element and the regulating element complicated and therefore inefficient in achieving a precise and effective transmission of motion.

[0016] Furthermore, complex kinematic chains also impose strict restrictions on the machining tolerances of their individual components to ensure the correct transmission of motion, which leads to higher production costs.

[0017] Secondly, a large number of parts generally means higher production time and cost, more complex assembly operations and a higher risk of assembly errors.

[0018] Furthermore, complex adjustment systems with a large number of components require a considerable amount of space, which in turn leads to restrictions in the design of the headrest and the risk of poor user comfort.

[0019] Finally, a disadvantage that cannot be ignored is that the large number of components also affects the overall weight of the headrest, which is usually considered a negative factor by vehicle manufacturers.

[0020] Therefore, the main object of the present invention is to overcome the above mentioned drawbacks of the prior art by providing an adjustable headrest whose adjustment system is simple, robust and reliable.

[0021] This and other objects are achieved by a headrest as claimed in the appended claims. Summary of the invention

[0022] The invention relates to a headrest, which comprises one or more supporting rods and a headrest body mounted on the supporting rods, wherein the headrest body comprises a headrest body front part or a front shell and a headrest body rear part or a rear shell.

[0023] The support rod is arranged to be attached to the backrest of the seat and the position of the headrest body along the support rod is adjustable, ie the position of the headrest body can be adjusted in a first or vertical direction to bring the headrest body closer to or away from the upper side of the seat back.

[0024] Additionally, the position of the front housing of the headrest body relative to the rear housing of the headrest body can be adjusted in a second direction or longitudinal direction substantially perpendicular to the first direction so that the front housing of the headrest body can be moved closer to or further away from the user's head.

[0025] For this purpose, the headrest body is provided with one or more locking elements (one locking element for each support rod), each of which can be controlled to switch from a locked position to an unlocked position and from an unlocked position to a locked position, in which the locking element interacts with the corresponding support rod and locks the position of the headrest body relative to the support rod, and in which the locking element does not interact with the corresponding support rod and allows the position of the headrest body relative to the support rod to be changed.

[0026] The headrest body is also provided with a first engaging element integral with the front shell, and a second engaging element integral with the rear shell, wherein the first engaging element and / or the second engaging element can be controlled to switch from an engaged position to a disengaged position and from a disengaged position to an engaged position, wherein in the engaged position, the first engaging element and the second engaging element interact with each other and lock the position of the front shell relative to the rear shell, and in the disengaged position, the first engaging element and the second engaging element do not interact with each other and allow the position of the front shell relative to the rear shell to be changed.

[0027] According to the invention, the headrest comprises a single control slide which acts both directly on the locking element in order to bring the locking element from the locked position to the unlocked position and vice versa, and directly on the first engagement element and / or the second engagement element in order to bring the first engagement element and the second engagement element from the engaged position to the disengaged position and vice versa.

[0028] The control slider is usually in an inactive position, in which the locking element is in a locked position, the first engagement element and the second engagement element are in an engagement position, and the configuration of the headrest body is locked. For this purpose, the headrest may include elastic means for urging the control slider toward the inactive position.

[0029] The headrest according to the invention further comprises a control element, such as for example a control button, on which a user can act to bring a control slider into an active position (by overcoming the resistance of elastic means, if provided), wherein the control slider controls the locking element to switch into an unlocked position and controls the first engagement element and / or the second engagement element to switch into a disengaged position, whereby the configuration of the headrest body can be changed.

[0030] According to a preferred and particularly simple embodiment of the invention, the locking element is directly and rigidly connected to the control slide; in addition, the first engagement element and / or the second engagement element is directly and rigidly connected to the control slide.

[0031] It will be obvious to a person skilled in the art that in this way the kinematic chain of the headrest adjustment system according to the invention is extremely simple and compact, which makes the construction and assembly of the adjustment system simple and inexpensive and makes the operation of the adjustment system extremely reliable.

[0032] Furthermore, the absence of small metal parts and the overall extremely limited number of small parts make construction and assembly particularly easy.

[0033] For the same reason, the headrest adjustment system according to the invention is robust and overall highly resistant to wear and tear as well as stress deformations during adjustment and operation.

[0034] Finally, the structure of the headrest adjustment system according to the invention allows for greater precision during adjustment, in particular along the second or longitudinal direction.

[0035] According to a preferred embodiment of the invention, to switch from the inactive position to the active position, the control slide is moved along a third or lateral direction substantially perpendicular to the first and second directions, ie substantially perpendicular to both adjustment directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features and advantages of the invention will become more apparent from the following detailed description of some preferred embodiments of the invention, provided by way of non-limiting examples with reference to the accompanying drawings, in which:

[0037] In the figure:

[0038] Figure 1 is an exploded perspective view of a headrest according to the present invention.

[0039] Figure 2 Shown along Figure 1 The main components of the adjustment system of the headrest in the first direction or vertical direction;

[0040] Figure 3a Shows Figure 1 a locking element of an adjustment system of a head restraint in a locked position;

[0041] Figure 3b Shows Figure 1 a locking element of an adjustment system of a head restraint in an unlocked position;

[0042] Figure 4 Shown along Figure 1 The main components of the second direction or longitudinal direction adjustment system of the headrest;

[0043] Figure 5a Shows Figure 1 a first engagement element and a second engagement element of an adjustment system of a head restraint in an engaged position;

[0044] Figure 5b Shows Figure 1 A first engagement element and a second engagement element of an adjustment system of a head restraint are in a disengaged position. DETAILED DESCRIPTION

[0045] First refer to Figure 1 , Figure 1 A head restraint 1 according to the invention is shown.

[0046] The headrest 1 can be, for example, a headrest of a vehicle seat, in particular a motor vehicle seat. However, this application should not be considered in a restrictive sense and the headrest 1 can also be applied to other types of seats.

[0047] The headrest 1 comprises one or more support rods. Figure 1 In the embodiment of the headrest 1, the headrest 1 comprises two support rods 3a, 3b. However, a different number of support rods may also be provided.

[0048] The support rods 3a, 3b are arranged to be attached to the backrest of the seat at a first or lower end of the support rods and in the embodiment shown are connected to each other at a second or upper end of the support rods by means of a cross member 3c.

[0049] The headrest 1 also comprises a headrest body, which is indicated as a whole with the reference numeral 1 , mounted on the support bars 3 a , 3 b .

[0050] For this purpose, the headrest body 5 comprises an inner frame 7 provided with seats or channels 9a, 9b inside which the support bars 3a, 3b are housed, respectively.

[0051] As will be apparent from the following description, the inner frame 7 - and therefore the headrest body 5 - is mounted on the support rods 3a, 3b in a manner slidable along said rods, whereby the position of the headrest body can be adjusted in a first or vertical direction Z.

[0052] Correspondingly, the channels 9a, 9b along the inner frame 7 are preferably provided with guide bushings 11. For example, in the illustrated embodiment, each channel 9a, 9b of the inner frame 7 is provided with a first guide bushing 11 at its lower end and a second guide bushing 11 at its upper end.

[0053] In order to selectively allow or prevent the headrest body 5 from sliding relative to the support rods 3a, 3b, the headrest 1 is provided with locking elements 13a, 13b (one locking element for each support rod 3a, 3b), the structure and operation of which will be described in detail below.

[0054] The headrest body 5 further includes a headrest body front shell or front portion 5a and a headrest body rear shell or rear portion 5b.

[0055] As will be apparent from the following description, the front housing 5a and the rear housing 5b are connected to each other so that their distance along a second direction or longitudinal direction X (which is substantially perpendicular to the first direction or vertical direction Z) can be varied.

[0056] Correspondingly, one of the shells, specifically the rear shell 5b, is directly and fixedly connected to the inner frame 7, while the other of the shells, specifically the front shell 5a, is connected to a slide 15, which for this purpose includes a connecting plate 15a and is provided with a body 15b, which is slidably received in a corresponding seat 7a provided in the inner frame 7.

[0057] The body 15b of the slide 15 and the seat 7a of the inner frame 7 can be shaped to ensure that the alignment between the slide 15 and the inner frame 7 is maintained when the slide slides relative to the inner frame, that is, the movement of the slide 15 relative to the inner frame 7 (and therefore the movement of the front shell 5a relative to the rear shell 5b) only occurs along the second direction or longitudinal direction X.

[0058] For example, in the illustrated embodiment, the body 15b of the slide 15 is provided with four ribs 17 oriented along the second direction or longitudinal direction X, and the four ribs 17 are received in corresponding grooves (these grooves are also oriented along the second direction or longitudinal direction X) provided along the inner contour of the seat 15 of the inner frame 7.

[0059] It is obvious that the ribs can also be arranged in different numbers on the body 15b of the sliding member 15, and it is also obvious that grooves oriented along the second direction or longitudinal direction X can be arranged on the body 15b of the sliding member 15, and corresponding ribs (which are also oriented along the second direction or longitudinal direction X) can be arranged along the contour of the seat 7a of the inner frame 7.

[0060] In order to selectively allow or prevent the slide 15 from sliding relative to the inner frame 7, the inner frame is provided with a first engagement element 19 and the slide 15 is provided with a second engagement element 21, the structure and operation of which will be described in detail below.

[0061] According to the present invention, the locking elements 13a, 13b can be controlled to switch from a locked position to an unlocked position, in which the locking elements 13a, 13b lock the position of the inner frame 7 (and therefore the headrest body 5) relative to the corresponding support rods 3a, 3b, and in the unlocked position, the locking elements 13a, 13b do not interact with the corresponding support rods and allow the inner frame 7 to slide freely relative to the corresponding support rods.

[0062] In addition, the engaging elements 19, 21 can be controlled to switch from an engaged position to a disengaged position, in which the engaging elements 19, 21 interact with each other and lock the position of the slide 15 relative to the inner frame 7 (and thus lock the position of the front shell 5a relative to the rear shell 5b), and in the disengaged position, the engaging elements 19, 21 do not interact with each other and allow the slide 15 to slide relative to the inner frame 7 (and thus allow the distance between the front shell 5a and the rear shell 5b to change).

[0063] According to the present invention, the headrest 1 provides a single control slider 23, which simultaneously controls the switching of the locking elements 13a, 13b from the locked position to the unlocked position and the switching of the engaging elements 19, 21 from the engaged position to the disengaged position, as well as the switching of the locking elements 13a, 13b from the unlocked position to the locked position and the switching of the engaging elements 19, 21 from the disengaged position to the engaged position.

[0064] Specifically, according to the present invention, the control slider 23 acts directly on the locking elements 13a, 13b to control the switching of the locking elements from the locking position to the unlocking position and the switching of the locking elements from the unlocking position to the locking position, and the control slider 23 acts directly on the first engaging element 19 or the second engaging element 21 to control the switching of the engaging element from the engaging position to the disengaging position and the switching of the engaging element from the disengaging position to the engaging position.

[0065] Even more specifically, in the embodiment shown, the locking elements 13a, 13b are directly and rigidly connected to the control slide 23, and the first engagement element 19 is directly and rigidly connected to the control slide 23 (in an alternative embodiment, the second engagement element 21 can be directly connected to the control slide 23).

[0066] Preferably, the control slider 23 is capable of moving along a third direction or lateral direction Y to simultaneously control the switching of the locking elements 13a, 13b from the locking position to the unlocking position and the switching of the engaging elements 19, 21 from the engaging position to the disengaging position, as well as the switching of the locking elements 13a, 13b from the unlocking position to the locking position and the switching of the engaging elements 19, 21 from the disengaging position to the engaging position, and the third direction or lateral direction Y is substantially orthogonal to the first direction or vertical direction Z and the second direction or longitudinal direction X at the same time.

[0067] Obviously, during normal use, the configuration of the headrest body must be fixed. Therefore, the control slide 23 is normally in an inactive position in which the locking elements 13a, 13b are in a locked position and the engagement elements 19, 21 are in an engaged position.

[0068] Preferably, resilient means, such as a spring 25, urge the control slide 23 towards said inactive position.

[0069] By overcoming the resistance of the spring 25, the control slider 23 can be brought to the active position by translating from the inactive position along the third direction or lateral direction Y. In the active position, the control slider 23 controls the locking elements 13a, 13b to switch to the unlocked position and switches the engaging elements 19, 21 to the disengaged position.

[0070] For example, you can set up control buttons such as ( Figure 1 2 ) on which the user can act to bring the control slide 23 from its inactive position to its active position.

[0071] As soon as the user releases the control element (button), the spring 25 brings the control slide 23 back to the inactive position.

[0072] Figure 2 , Figure 3a and Figure 3b The mechanism for adjustment in the first or vertical direction Z is shown in more detail. As anticipated above, only the parts of the head restraint 1 that are necessary for understanding the adjustment mechanism are illustrated in the figures.

[0073] In the embodiment shown, two locking elements 13a, 13b are provided, one for each of the support rods 3a, 3b.

[0074] In the embodiment shown, said locking elements 13 a , 13 b are made as appropriately shaped wire elements and are directly and rigidly connected to the body of the control slide 23 .

[0075] exist Figure 3a In the locking position shown, the locking elements 13a, 13b are in contact with the surface of the corresponding support rod.

[0076] In order to ensure a secure and safe locking of the locking elements 13a, 13b when in this position, a recess 29a, 29b adapted to securely accommodate said locking elements is provided on the body of each of the support rods 3a, 3b.

[0077] The recesses 29a, 29b are distributed along the first or vertical direction Z over the surface of the support bars 3a, 3b, preferably in a uniform manner.

[0078] Preferably, the recess is provided with a guide surface. In this way, if the locking element is in an intermediate position between two adjacent recesses at the end of the operation of adjusting the position of the headrest body, the locking element will be smoothly driven towards the closer recess and will be securely accommodated therein.

[0079] exist Figure 3b , the locking element is shown in the unlocked position. The user acts on the control button 27 by overcoming the resistance of the spring 25 and translating the control slide 23 along the third or transverse direction Y. Since the locking element is directly and rigidly connected to the body of said control slide, the locking element also performs a translation movement along the third or transverse direction Y (to the left in the figure), thereby disengaging the notches 29a, 29b and moving away from the surface of the respective support rod 3a, 3b.

[0080] In this configuration, the inner frame 7 (and therefore the headrest body 5 ) can slide in a first or vertical direction Z along the support rods 3 a , 3 b .

[0081] When the control button 27 is released, the spring 25 will bring the control slide 23 back to the starting position and at the same time the locking elements 13a, 13b will be brought back to the locking position again.

[0082] By comparison Figure 3a and Figure 3bIt can be seen that since the control slide 23 performs a simple translation movement in the transverse direction Y, the locking element is directly and rigidly connected to the body of the control slide, and the support rods 3a, 3b are provided with recesses 29, 29b on their faces oriented along the transverse direction Y, the kinematic chain is compact and comprises a small number of components, and adjustment of the position of the headrest along the first direction or vertical direction Z is simple and reliable.

[0083] Figure 4 , Figure 5a and Figure 5b The mechanism for adjustment in the second or longitudinal direction X is shown in more detail. As anticipated above, only the parts of the head restraint 1 that are necessary for understanding the adjustment mechanism are illustrated in the figures.

[0084] In the embodiment shown, the first engagement element is made as an engagement tooth 19 which is directly and rigidly connected to the body of the control slide 23 .

[0085] The second engagement element 21 is made as a rack profile 21 provided on the body 15 b of the slide 15 , wherein the engagement teeth 19 and the rack profile 21 are suitably shaped and arranged such that the engagement teeth 19 can fit into seats of the rack profile 21 .

[0086] exist Figure 5a In the illustrated engagement position, the engagement tooth 19 is actually inserted into the seat of the rack profile 21 and is firmly held in the seat of the rack profile 21 by means of the thrust force exerted by the spring 25 .

[0087] exist Figure 5b , the first and second engagement elements are shown in a disengaged position. The user acts on the control button 27 by overcoming the resistance of the spring 25 and translating the control slide 23 in the third or transverse direction Y. The engagement tooth 19, which is directly and rigidly connected to the body of the control slide, also performs a translation movement in the third or transverse direction Y (to the right in the drawing), thereby disengaging the seat receiving the engagement tooth 19 and moving away from the rack profile 21.

[0088] In this configuration, the slider 15 (and thus the front shell 5 a of the headrest 5 ) can slide in the second or longitudinal direction X relative to the inner frame 7 (and thus relative to the rear shell 5 a of the headrest body 5 ).

[0089] When the control button 27 is released, the spring 25 will bring the control slide 23 back to the starting position and at the same time the engagement tooth 19 will again engage with the rack profile 21 (into a different seat of said rack profile).

[0090] By comparison Figure 5a and Figure 5b It can be seen that since the control slide 23 performs a simple translation movement in the transverse direction Y and the engagement tooth is directly and rigidly connected to the body of the control slide, the kinematic chain is compact and comprises a small number of components, and adjusting the position of the headrest along the second direction or longitudinal direction Y is simple and reliable.

[0091] In view of the above, the operation of the headrest 1 according to the present invention will be fully apparent to those skilled in the art.

[0092] Starting from the initial configuration, the user can act on the control button 27 and translate the control slide 23 and the locking elements 13a , 13b and the engaging tooth 19 directly and rigidly connected to its body in the transverse direction Y by overcoming the elastic resistance of the spring 25 .

[0093] By means of this translational movement, the locking elements 13a, 13b will move away from the surface of the respective support rods 3a, 3b, thereby switching from the locked position to the unlocked position; at the same time, the engagement tooth 19 will move away from the rack profile 21, thereby switching from the engaged position to the disengaged position.

[0094] At this point, as long as the user presses the control button 27, the headrest configuration can be changed and adjusted in the vertical direction Z and in the longitudinal direction X, so that the headrest configuration is adapted to the needs of the individual user occupying the seat.

[0095] As soon as the control button 27 is released, the control slide will return under the action of the spring 25 , thereby bringing the locking elements 13 a , 13 b back into the locking position and simultaneously bringing the engagement toothing 19 back into its position of engagement with the rack profile 21 .

[0096] The adjustment of the head restraint 1 is therefore extremely simple and reliable and is based on a very small number of components.

[0097] Obviously, the detailed description of the preferred embodiments provided herein should not be considered limiting and that numerous variations and modifications capable of being implemented by a person skilled in the art may be implemented without departing from the scope of protection defined by the appended claims.

[0098] For example, the control button (or other control element) may be arranged to be switchable between two positions, a first position in which it holds the slider in an inactive position and a second position in which it holds the slider in an active position. In this way, once the control button has been brought to the second position, the user should not continue to keep it pressed when adjusting the headrest configuration, but the user can release the control button and headrest adjustment can continue until the control button is switched to the first position.

Claims

1. A headrest (1), comprising one or more support rods (3a, 3b) and a headrest body (5) mounted on the support rods (3a, 3b), wherein: The headrest body (5) comprises an inner frame (7) provided with one or more channels (9a, 9b), the one or more support rods (3a, 3b) are respectively accommodated inside the channels (9a, 9b), and the headrest body (5) further comprises a front shell (5a) and a rear shell (5b), wherein the inner frame (7) is slidably mounted on the support rods (3a, 3b), and wherein the headrest (1) is provided with one or more locking elements (13a, 13b), one locking element for each support rod (3a, 3b), and the locking elements (13a, 13b) can be controlled to switch from a locked position to an unlocked position and The headrest (1) is configured to switch from the unlocked position to the locked position, wherein the locking element (13a, 13b) prevents the inner frame (7) from sliding relative to the support rods (3a, 3b), and the locking element (13a, 13b) allows the inner frame (7) to slide relative to the support rods (3a, 3b), wherein the front shell (5a) is movable relative to the rear shell (5b), and wherein the headrest (1) is provided with a first engaging element (19) and a second engaging element (21), wherein the first engaging element (19) and the second engaging element (21) are controllable to switch from the engaged position to the disengaged position. The headrest (1) is provided with a single control slider (23), wherein the control slider (23) controls the locking elements (13a, 13b) to bring the locking elements (13a, 13b) from the locking position to the unlocking position and simultaneously controls the first engagement element (19) and / or the second engagement element (21) to prevent the front housing (5a) from moving relative to the rear housing (5b), and wherein the first engagement element (19) and / or the second engagement element (21) allow the front housing (5a) to move relative to the rear housing (5b). The headrest (1) is characterized in that the locking elements (13a, 13b) and the first engaging element (19) and / or the second engaging element (21) are directly and rigidly connected to the body of the control slider (23).

2. The headrest (1) according to claim 1, wherein: The control slide (23) is switchable from an inactive position, in which the locking elements (13a, 13b) are in the locking position and the engaging elements (19, 21) are in the engaging position, to an active position and from the active position to the inactive position, and the headrest is provided with a control element (27) for bringing the control slide from the inactive position to the active position.

3. The headrest (1) according to claim 2, wherein: The control slide (23) is urged towards the inactive position by means of an elastic element (25), and wherein the control element (27) brings the control slide from the inactive position to the active position by overcoming the resistance of the elastic means (25).

4. A headrest (1) according to any one of the preceding claims, wherein: The inner frame (7) is mounted on the support rods (3a, 3b) so as to be able to slide along a first direction (Z), and wherein the front housing (5a) is able to move relative to the rear housing (5b) along a second direction (X) substantially perpendicular to the first direction (Z).

5. A headrest (1) according to claims 2 and 4, wherein: The control slider (23) switches from the inactive position to the active position and from the active position to the inactive position by translating along a third direction (Y) substantially perpendicular to both the first direction (Z) and the second direction (X).

6. A headrest (1) according to any one of the preceding claims, wherein: The locking element (13a, 13b) is made as a shaped wire element, and wherein a recess (29a, 29b) suitable for accommodating the locking element is provided on the surface of each of the support bars (3a, 3b).

7. A headrest (1) according to any one of the preceding claims, wherein: The second engagement element is made as a rack profile (21) provided with a plurality of seats, and the first engagement element is made as an engagement tooth (19) adapted to fit into one of the seats of the rack profile (21).

8. The headrest according to claim 7, wherein: The engaging tooth (19) is directly and rigidly connected to the body of the control slide (23).

9. A headrest (1) according to any one of the preceding claims, wherein: One of the front shell and the rear shell (5b) is fixedly connected to the inner frame (7), and the other of the front shell and the rear shell (5a) is connected to a sliding member (15), the sliding member (15) including a body (15b) slidably received in a corresponding seat (7a) provided in the inner frame (7), wherein the inner frame (7) is provided with the first engaging element (19) and the sliding member (15) is provided with the second engaging element (21), and wherein when the first engaging element (19) and the second engaging element (21) are in the engaging position, the sliding member (15) is prevented from sliding relative to the inner frame, and when the first engaging element (19) and the second engaging element (21) are in the disengaging position, the sliding member (15) is allowed to slide relative to the inner frame.

10. The headrest (1) according to claim 9, wherein: The body (15b) of the slide (15) is provided with one or more guide ribs (17) / grooves which cooperate with corresponding guide grooves / ribs provided along the inner contour of the seat (7a) of the inner frame (7).

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