Guiding device for a headrest of a vehicle seat and headrest comprising a guiding device

Abstract

This invention relates to a guide device for a headrest of a vehicle seat and a headrest including the guide device. The guide device includes at least one retaining rod having at least one retaining structure, which is supported on the vehicle seat by means of at least one guide device each having a receiving portion. The receiving portion forms a channel for supporting and guiding the retaining rod. The guide device has a locking device having at least one locking member including a locking structure movable between a locked position and a disengaged position. The locking member is disengaged from at least one retaining structure of the retaining rod and can be engaged to prevent movement of the retaining rod along the channel in at least one direction. The locking structure has at least one mating surface that interacts with the driving surface of the retaining structure to drive the locking member when the retaining rod rotates about a longitudinal central axis about at least one rotational direction.

Description

Technical Field

[0001] According to a first aspect, the present invention relates to a guiding device. Background Technology

[0002] Such a guiding device is known from prior use. The headrest's head component is supported on the back of the vehicle seat by two retaining rods. A guiding device is fixed to the vehicle structure of the vehicle seat, which supports and guides the retaining rods. Each of these support rods has, for example, multiple locking notches, wherein a locking element of the guiding device works in conjunction with one of the locking notches to lock the retaining rod in a position. Due to the extremely high forces, for example, caused by a vehicle collision, a problem often arises where the support rod twists relative to its longitudinal central axis. When the locking structure is only provided on one side of the support rod, the locking element loses engagement with the locking structure of the support rod due to this twisting.

[0003] To address this problem, known measures include forming a notch that surrounds the retaining rod. According to an alternative, the notch is formed over a larger circumferential area of ​​the retaining rod.

[0004] DE 10 2015 012 411 relates to a headrest including a locking device, wherein the locking device is configured to be movably configured so that it rotates together with the retaining rod when the retaining rod rotates. Summary of the Invention

[0005] The objective of this invention is to provide a guiding device that is simple to manufacture yet has high functional reliability, especially when the retaining rod rotates about the longitudinal axis.

[0006] This task is solved by the guiding device of the present invention.

[0007] The guide device is provided for a headrest, particularly for a headrest of a vehicle seat. The headrest has at least one retaining rod. At least one free end of the retaining rod bow is also referred to herein as a retaining rod. For example, the headrest may have two retaining rods or each free end of a retaining rod bow.

[0008] The retaining rod can be supported on a vehicle seat using a guide device having at least one receiving portion. The guide device may additionally have, for example, a shielding portion forming a flange configured to cover the edge of an opening in the cushion. The guide device forms a channel for supporting and guiding the retaining rod. The retaining rod can be inserted into and held therein. The receiving portion can be fastened, for example, to the vehicle seat, particularly to the backrest of the vehicle seat. For example, it can be fastened to the structure of the backrest.

[0009] In the context of this invention, the channel should be understood as forming a guide portion that enables the movement of the retaining rod in two opposite directions of motion and provides support. A closed wall is not important to this invention. The channel can be formed by a guide portion comprising only a small planar device that guides the retaining rod such that the retaining rod has only two degrees of freedom in opposite directions of motion.

[0010] The retaining rod can be locked relative to the receiving portion in at least one position using a locking device. The locking device has at least one movable locking member disposed on the receiving portion. The locking member has a locking structure that can be disengaged from at least one retaining structure of the retaining rod in an engagement. The locking member is held on the receiving portion in such a way that it can transmit force to the receiving portion. The receiving portion itself is held on a vehicle seat, for example, in such a way that it can transmit force to the vehicle seat.

[0011] The locking device is movable between a locked position and a disengaged position, wherein in the locked position, the locking member is engaged with the retaining structure, and in the disengaged position, the locking member is disengaged from the retaining structure. In the locked position, the retaining rod cannot move along the direction of the channel's degrees of freedom. This is, for example, in opposite directions along a predetermined movement path through the channel. In the locked position, force can be transmitted between at least one retaining surface of the retaining structure and the locking surface of the locking member.

[0012] At least one locking surface of the locking member interacts with at least one supporting surface of the receiving portion to transmit force from the locking member to the receiving portion in the locked position. The locking surface interacts with the receiving portion to receive and transmit the force exerted by the retaining rod in the direction of the channel's degree of freedom to the receiving portion. For example, a side region of the locking surface interacts with the receiving portion.

[0013] The at least one mating surface of the locking member can transmit force from the at least one driving surface of the retaining rod to the locking member in the direction of rotation about the central axis of the retaining rod. The receiving portion is configured such that after the locking member follows the rotation of the retaining rod, force can also be transmitted from the retaining rod through the locking member to the receiving portion so that the retaining rod is not disengaged in the locked position. For this purpose, the receiving portion has support surfaces, which are configured such that they can also receive force when the locking member rotates.

[0014] The retaining rod has at least one retaining structure. The retaining structure has at least one retaining surface that interacts with the locking surface of the locking member. For example, two opposing retaining surfaces are provided, which interact with the two locking surfaces to prevent movement of the retaining rod in opposite directions.

[0015] Furthermore, the retaining structure has at least one driving surface that interacts with the mating surface of the locking structure. Specifically, it comprises two driving surfaces, each interacting with a mating surface, to ensure the actuation of the locking element when the retaining rod rotates in opposite directions of rotation. The interacting surfaces, i.e., the driving and mating surfaces, are arranged such that the receiving portion actuates the locking element when the retaining rod rotates about the longitudinal central axis of the channel. The actuation of the locking element during the rotation of the retaining rod is achieved via the driving surface, which transmits the force acting in the direction of rotation between the retaining rod and the locking element.

[0016] The advantage of the features according to the invention is that, based on the action of the locking member during the rotation of the retaining rod about the longitudinal central axis, accidental disengagement of the locking device from the locked position is prevented. The locking members rotate together based on the acting surfaces, and thus the engagement between the locking member and the retaining structure is maintained. In other words, after the joint rotation of the retaining rod and the locking member, the support rod cannot move in the direction of the locked degree of freedom. The solution according to the invention also has the advantage of resulting in low manufacturing costs.

[0017] The locking and / or retaining structures may have, for example, rectangular, V-shaped, U-shaped, or semi-circular shapes, and the locking structure may have complementary shapes. However, any conceivable shape may ultimately be used, which prevents relative movement between the locking element and the locking structure when the support shaft rotates about the central axis. This can also be achieved, for example, through a freely shaped profile.

[0018] The locking element can be moved in a manner that allows it to be engaged with the locking structure in every conceivable way. For example, the locking element can move generally radially relative to the retaining rod between a locked position and a disengaged position. When the locking element is supported on the retaining element, for example, it deflects, for example, on a circular track. In this case, the movement also includes a non-radial component.

[0019] The locking element is, for example, plate-shaped, meaning its thickness is relatively small compared to its length and width. At least one locking surface and at least one mating surface may be formed on the locking element.

[0020] The guiding device, for example, has an operating mechanism for manipulating the locking element. The locking element, for example, works in conjunction with an operating element. The operating element can, for example, move the locking element between a locked position and a disengaged position. The operating element can, for example, be configured as a slider and operated using an operating element operable from the outside on the headrest or vehicle seat.

[0021] The locking member is movably guided on the receiving portion between the locked and disengaged positions, for example by a guide surface or a guide groove. In this way, the locking member is always held in the correct position during its movement between the locked and disengaged positions. Furthermore, the force acting on the locking member can be received by the guiding structure of the guide groove. The guide surface is formed, for example, by the support surface mentioned in this application.

[0022] The guide portion of the locking element may have a stop surface that defines the locking position such that the locking element cannot be in contact with the bottom surface of the retaining structure, which extends substantially parallel to the longitudinal central axis of the retaining rod. The stop surface may be formed on the receiving portion. This prevents adjustment noise and minimizes wear on the retaining rod and locking element.

[0023] The guide portion may be additionally or alternatively provided with a stop surface, as described in the preceding paragraphs, which defines the movement of the locking member in the disengagement direction.

[0024] The locking member is rotatably supported, for example, about one axis or alternatively about two axes. The locking member can be rotatably held on the receiving portion, for example, about a first axis provided parallel to the longitudinal central axis of the support rod. In this way, the locking member can follow the rotation of the retaining rod within a certain range, so that the engagement of the locking member with the retaining structure is not lost.

[0025] Alternatively or additionally, the locking element may be rotatably supported about a generally horizontal axis, which assists in rapid locking when the locking element moves into the locked position.

[0026] The locking member is, for example, supported on a support member. The support member is movable relative to the guide device, especially relative to the receiving portion. Additionally, the locking member is movable relative to the support member. The locking member is rotatably held on the support member, for example, about at least one axis. For example, the locking member is rotatably held on the support member about two axes. The support member may be, for example, an arm. The arm may be elastically deformable.

[0027] For example, the side area of ​​the locking member interacts with the supporting surface of the receiving part, which is positioned opposite to it. In this way, the force transmitted from the retaining rod to the locking member in two opposite directions can be received by the receiving part.

[0028] The receiving portion is formed, for example, by a guide sleeve. The guide sleeve may be fastened to the backrest structure, for example.

[0029] According to a second aspect, the present invention relates to a headrest device. The headrest device has a head member including a headrest surface and a retaining device for supporting the head member on a vehicle seat, particularly the backrest of a vehicle seat. Furthermore, the headrest device has at least one guide device for supporting at least one retaining rod or at least one free end of a retaining rod bow member of the retaining device on the vehicle seat.

[0030] Such a headrest device is known from the prior art as described with respect to the first aspect of the invention.

[0031] The objective of this invention is to provide a headrest device that is simple to manufacture yet has high functional reliability, especially when the retaining rod rotates about the longitudinal axis.

[0032] This task is solved by the headrest device according to the present invention.

[0033] A headrest device is designed for use in seats, particularly vehicle seats. The headrest device has a head component and a retaining device including at least one retaining rod. The at least one retaining rod has at least one retaining structure. Furthermore, the headrest device has a guide device for guiding and supporting the retaining rod. A locking device has a movable locking member disposed to the guide device, wherein the locking member engages with the retaining structure in a locked position and disengages from the retaining structure in a disengaged position.

[0034] The guiding device is configured according to a first aspect of the invention. The retaining structure has at least one driving surface, which interacts with the mating surface of the locking member in such a way that the locking member is driven when the retaining rod rotates about the longitudinal central axis (m) in at least one direction of rotation.

[0035] Regarding the advantages of the headrest device, to avoid repetition, see the first aspect of the present invention.

[0036] The locking and retaining structures, for example, have at least a region that is lockably and detachably positioned in an engagement.

[0037] The retaining structure and the locking structure are, for example, complementary.

[0038] The retaining device has, for example, two retaining rods or a retaining rod bow-shaped member with two free end regions. The free end regions are also referred to as retaining rods in this application.

[0039] At least one retaining rod is provided with an arrangement of at least one retaining structure. This arrangement means that one or more retaining structures are configured such that a locking element can move into engagement with each individual retaining structure. For example, one or more retaining structures are arranged parallel to the longitudinal axis of the retaining rod. Thus, for example, only one retaining structure can be provided, which holds the support rod in the receiving portion of the backrest. Alternatively, at least two retaining structures can be provided, so that the retaining rod can be locked relative to the receiving portion in different relative positions.

[0040] To maintain the structure, each of the aforementioned arrangement structures is configured with a locking element, for example. This ensures reliable locking. If, for example, two retaining rods are provided, each comprising one arrangement structure, then each arrangement structure is, for example, part of the locking device. Attached Figure Description

[0041] Embodiments of the invention are exemplarily described in the following description of the accompanying drawings, with reference to the drawings. For clarity—and whenever different embodiments are involved—the same or similar parts or elements or areas are indicated by the same reference numerals, in part by additional lowercase letters.

[0042] Features described with respect to only one embodiment may also be provided within the scope of the invention and in every other embodiment of the invention. Such modified embodiments—even if they are not shown in the drawings—are included together with the invention.

[0043] All disclosed features are essential to the invention in themselves. Therefore, the disclosure of this application also fully includes the disclosures of the relevant priority documents (copies of earlier applications) as well as the disclosures of referenced publications and the devices of the prior art described, and for this purpose, individual or multiple features of these documents are incorporated herein together.

[0044] in:

[0045] Figure 1 A front view of a headrest assembly including a headrest component, a retaining device, and a guide device is shown, wherein only one of the two guide devices is shown;

[0046] Figure 2 Showing according to Figure 1 The part divided by line B in the middle;

[0047] Figure 3 Showing according to Figure 1 The side view of arrow A in the view;

[0048] Figure 4 Showing according to Figure 3 The part divided by line C;

[0049] Figure 4aShowing according to Figure 4 The Z-section of the dividing line;

[0050] Figure 5 Showing according to Figure 4 A cross-sectional view of the cutting line DD in the diagram;

[0051] Figure 6 Showing according to Figure 4 A cross-sectional view of the section line EE in the figure, wherein the locking device is set in the locking position;

[0052] Figure 7 Showing according to Figure 6 A cross-sectional view, in which the locking element is positioned in the disengaged position;

[0053] Figure 8 Showing according to Figure 2 A partial view of the headrest component, in which the retaining rod and locking element have rotated relative to the receiving part;

[0054] Figure 9 Showing according to Figure 8 A cross-sectional view of the section line FF in the diagram;

[0055] Figure 10 Showing according to Figure 8 The cross-sectional view of section line GG in the diagram. Detailed Implementation

[0056] In the diagram, the vertical directions are represented by z1 and z2, the horizontal directions parallel to the sagittal axis of the seat occupant are represented by x1 and x2, and the horizontal directions parallel to the front axle are represented by y1 and y2. Directions p1 and p2 can be based on the tilt position of the vehicle seat back and their deviation from directions z1 and z2.

[0057] exist Figure 1 The headrest device is shown in the figure, generally indicated by reference numeral 10. The headrest device 10 has a head member 11 including a headrest surface 23, a retaining device 12 including retaining rods 13a and 13b, and guide devices 19a and 19b for supporting the retaining rods 13a and 13b on a vehicle seat (not shown). Only the guide device 19a is shown in the figure; the guide device 19b is indicated only by dashed lines.

[0058] Guide devices 19a and 19b can be fastened to the structure of a vehicle seat. Guide devices 19a and 19b each have an inlet opening 24 that transitions into a channel 25. Through the inlet opening 24, a corresponding retaining rod 13a or 13b can be inserted into the channel 25 in direction p2. The channel 25 thus limits the degrees of freedom of the retaining rods 13a and 13b such that when the corresponding retaining rods 13a and 13b are positioned in the channel 25, the retaining rods are movable only in directions p1 and p2. Each guide device 19a and 19b has a receiving portion 14 and a shielding portion 37.

[0059] Since guide devices 19a and 19b are essentially identical, only guide device 19a will be described below.

[0060] The inlet opening 24 is formed by a shielding portion 37, which in this embodiment forms an annular flange 27 for overlapping the cushion of the vehicle seat. The area below the guide device 19a (see...) Figure 2 The receiving part 14 is formed. The wall of the receiving part 14 has an opening 20. On the opening 20, tab structures 28 and 29 are formed at intervals relative to the longitudinal central axis m of the receiving part 14 and the retaining rod 13a, wherein tab structure 28 constitutes a support surface 30 and tab structure 29 constitutes a support surface 31. The functions of support surfaces 30 and 31 are further explained below.

[0061] By means of a locking device 15 movable between a locked position and a disengaged position (see...) Figure 2 The movement of the retaining rod 13a relative to the receiving portion 14 can be detachably locked. In this embodiment, the locking device 15 is shown only with respect to the receiving portion 14 of the guide device 14a, but the locking device is provided on both guide devices 19a and 19b and each locking device 15 works in conjunction with one of the retaining rods 13a and 13b.

[0062] In this embodiment, the locking device 15 serves as a release safety device, preventing the retaining rods 13a and 13b from moving out of the guide devices 19a and 19b along direction p1 or moving in the opposite direction p2. Alternatively or additionally, the locking device 15 may also serve as a height adjustment device for adjusting the retaining rods 13a and 13b relative to the corresponding receiving portion 14 along directions p1 and p2, or be configured in conjunction with a horizontal adjustment for adjusting and locking the head abutment member, which is adjustable relative to the base component along directions x1 and x2.

[0063] The locking device 15 has a locking (latch) member 16 held on the receiving portion 14, the locking member being movable in directions y1 and y2. Furthermore, the locking device 15 has at least one retaining structure 17 for the retaining rod 13a, and in this example, two retaining structures 17, with the locking member 16 disengagedly engaged with the retaining structure in the locked position (see [link]). Figure 2 The locking element 16 is loaded into the locked position by the spring 18.

[0064] In the locked position, the locking member 16 is engaged with the retaining structure 17 of the retaining rod 13a, and in the disengaged position, the locking member 16 is disengaged from the retaining structure 17. In the locked position, the retaining rod 13a cannot move along directions p1 and p2. In the disengaged position, movement along directions p1 and p2 is possible. Figures 1 to 6 In the middle, the locking member 16 is disposed in the locked position, and in Figure 7 In the middle, the locking element 16 is set in the disengaged position.

[0065] However, alternative retaining structure 17 may also be configured such that movement along direction p2 is possible in the locked position, but movement along direction p1 is prevented.

[0066] In the region of the locking member 16, the receiving part 14 has an opening 20 that allows the locking member 16 to move between a locked position and a disengaged position, and a spring 18 supported on the outer surface 26 of the receiving part 14 loads the locking member 16 into the locked position in the direction y1.

[0067] The locking member 16 is plate-shaped, meaning its thickness is relatively small compared to its height and width. The locking member 16 is movably guided between a locked position and a disengaged position by means of a guide portion.

[0068] In the locked position, the locking surfaces 22 and 44 of the locking member 16 prevent the retaining rod 13a from moving relative to the receiving portion 14a in directions p1 and p2. The locking surface 22 interacts with the first retaining surface of the retaining structure 17 and with the support surface 30. Furthermore, the locking surface 44 interacts with the second retaining surface of the retaining structure 17 and the support surface 31. In this way, forces acting in directions p1 and p2 can be transmitted from the retaining rod 13a to the receiving portion 14.

[0069] The locking device 15 is adjustable between a locked position and a disengaged position by means of an operating device 40 that can move between an unoperated position and an operated position. The operating device 40 is configured to... Figure 2The device includes an operating component 36, which allows a user to operate the control device 40 from outside the vehicle seat. In this example, the operating component 36 is formed by a shielding portion 37. However, it may alternatively be configured as a separate component. The operating component 36 works in conjunction with a control element 38. The control element 38 is movably guided on the receiving portion 14a along directions p1 and p2. When the operating component 36 is operated along direction p2, the control element 38 is adjusted by the operating component along direction p2.

[0070] When the actuating element 38 moves along direction p2, the locking member 16 moves from the locked position to the disengaged position. The movement of the locking member 16 along direction y2 is achieved through the actuating surface 39 of the actuating element 38, which interacts with the outer surface 41 of the locking member 16 facing the retaining rod 13a. The movement of the locking member along direction y2 is limited by two pin-shaped portions 47, each of which provides a limiting surface 48.

[0071] In this embodiment, the operating surface 39 is inclined to the direction of movement of the operating element 38 and forms a motion converter with the outer surface 41 of the locking member 16, the outer surface being complementaryly inclined in this region. The motion converter converts the force acting in direction p2 into a force acting in direction y2. The direction y2 is approximately perpendicular to direction p2. In this way, the locking member 16 can move from the locked position to the disengaged position against the force of the spring 18, disengaging from the retaining structure 17.

[0072] If the operating part 36 is unloaded, the spring 18 causes the locking part 16 to move back to the locked position along the direction y1.

[0073] In this embodiment, spring 18 is formed of an elastically deformable strip, such as rubber or plastic, or silicone, which loads the locking member 16 into the locked position and thereby loads the actuating element 38 and the actuating device 40 into the unoperated position based on the motion connection. Alternatively, two separate springs may be provided, wherein one spring loads the locking member and the other spring loads the actuating element 38. The at least one spring may also be made of other materials, such as a metal spring.

[0074] As in Figure 3 , 4 As can be seen in 4a, the locking member 16 has a locking structure 21, which works in conjunction with the retaining structure 17. The locking structure 21 provides mating surfaces 32 and 33. The retaining structure 17 has driving surfaces 34 and 35, wherein the driving surface 34 interacts with the mating surface 32 and the driving surface 35 interacts with the mating surface 33. The driving surfaces 34 and 35 and the mating surfaces 32 and 33 form, for example, acute angles, right angles, or obtuse angles.

[0075] The locking structure 21 of the locking member 16 can receive forces in the retaining rod 13a along the rotational directions u1 and u2 (see...). Figure 5 When rotating around the central axis m, the force is transmitted from the retaining structure 17 to the locking member 16. By driving surfaces 34 and 35, the force can be transmitted to mating surfaces 32 and 33 when the retaining rod 13a rotates in two directions, so that the locking member 16 moves together with the retaining rod 13a in the direction of rotation.

[0076] In this way, the locking member 16 disengages from the retaining structure 17 and the retaining rod 13a is no longer reliably held on the vehicle seat. As mentioned above, the locking member 16 also continues to transmit force to the receiving portion 14 after rotation, the force acting on the locking member 16 from the retaining rod 13a in direction p1 or p2. Figure 5 As can be seen, the receiving part 14 has stop surfaces 45 and 46, and the locking member 16 can abut against the stop surfaces when rotating to its maximum in the direction u1 or u2.

[0077] In this embodiment, the driving surfaces 34 and 35 and the mating surfaces 32 and 33 are generally V-shaped and complementary to each other. However, other shapes that prevent the retaining rod 13 from twisting can also be used. By means of rectangles, U-shapes, or semicircles, the force acting in the direction of rotation can be transmitted from the retaining rod 13a to the locking member 16. The locking structure 21 must be configured such that the force acting in the aforementioned direction can be transmitted from the retaining rod 13a to the locking member 16. Furthermore, the movement of the locking member 16 should be easily achievable between the locked position and the disengaged position.

[0078] exist Figure 4 , 4a In Figures 5 and 6, the locking element 16 is shown in the locked position. Movement of the retaining rod 13a along direction p1 or p2 is impossible. The retaining rod 13a is in the non-rotating position.

[0079] exist Figure 5 The diagram shows a cross-section along the longitudinal axis m, which, in the locked position, shows the retaining rod 13a, the receiving portion 14, and the locking member 16. It can be seen that the locking member 16 is embedded in the retaining structure 17 in the central region and protrudes beyond the retaining structure with side regions 42 and 43, so that it can be supported on the surfaces 30 and 31 of the receiving portion 14 to transmit forces acting in directions p1 and p2 to the receiving portion 14.

[0080] A longitudinal section parallel to the longitudinal axis m shows the locking position in which it engages with the retaining rod structure 17. Figure 6 The locking element 16. The force acting in the direction p1 or p2 transmitted to the locking element 16 by the retaining rod 13a is led out by the locking element 16 to the support surfaces 30 and 31 in the locked position.

[0081] exist Figure 7 In the middle, the locking member 16 moves to the disengaged position and disengages from the retaining rod structure 17. The retaining rod 13a can move in directions p1 and p2.

[0082] exist Figures 8 to 10 The image shows a retaining rod 13a that rotates relative to the receiving part 14a in the direction u2. A locking member 16 rests against the stop surface 46. Figure 9 and 10 As shown, the locking member 16 is driven by the retaining rod 13a along direction u2 based on the driving surface 34, and is further engaged with the retaining rod structure 17 in the locked position. Furthermore, the locking member 16 also interacts with the support surfaces 30 and 31 in the torsional position. The locking member thus prevents movement along directions p1 and p2.

Claims

1. Guide device for a headrest, the headrest comprising at least one holding rod, the holding rod having a longitudinal center axis and having a holding structure, the guide device having a receiving part, the receiving part constituting a channel for supporting and guiding the holding rod so that the holding rod can be moved in a movement direction along the channel in a backrest of a vehicle seat, and the receiving part having a support surface; and the guide device having a locking device, the locking device releasably locking the holding rod in a position relative to the receiving part, and the locking device having a locking element which is movable between a locking position and a release position and which in turn comprises a locking structure, the locking structure being configured to releasably engage with the holding structure of the holding rod in order to prevent movement of the holding rod along the channel in the movement direction, the locking structure having a cooperation surface which in the locking position engages with a driving surface of the holding structure, the driving surface transmitting a rotational force to the cooperation surface of the locking element so as to effect a driving of the locking element when the holding rod is rotated about the longitudinal center axis with respect to an opposite rotational direction, and after the locking element has been rotated by the holding rod, a force in the movement direction along the channel is transmitted from the holding rod via the locking element to the support surface of the receiving part so that the locking element does not release from the locking position, wherein The locking element has a locking face and the holding structure has a holding face, which in the locking position prevent movement of the holding lever relative to the receiving part, the entraining face and the mating face being at least positionally separate from the locking face and the holding face.

2. The guide of claim 1, wherein At least one region of the locking structure (21) has a rectangular shape, a V-shape, a U-shape or a semicircular shape.

3. The guide of claim 1, wherein The locking element (16) is movable radially relative to a longitudinal center axis (m) of the channel (25).

4. A guide device according to one of claims 1 to 3, characterized in that The locking element (16) is plate-shaped, wherein the thickness of the locking element is smaller than its length and width.

5. A guide device according to one of claims 1 to 3, characterized in that The locking element (16) cooperates with the actuating element (38) such that the locking element (16) is movable by the actuating element (38) between the locking position and the release position.

6. A guide device according to one of claims 1 to 3, characterized in that The locking element (16) has a guide portion with a guide face of the receiving part (14), with which the locking element (16) is guided movably between the locking position and the release position.

7. The guide of claim 6, wherein The guide portion of the locking element (16) has a stop face for the locking position, such that the locking element (16) cannot enter into contact with a base face of the holding structure which extends essentially parallel to the longitudinal center axis (m).

8. A guide device according to one of claims 1 to 3, characterized in that The locking element (16) is supported on a support element.

9. A guide device according to one of claims 1 to 3, characterized in that Side face regions (42, 43) of the locking element (16) cooperate with support faces (30, 31) of the receiving part.

10. A guide device according to one of claims 1 to 3, characterized in that The receiving part is formed by a guide sleeve.

11. Headrest device for a seat, comprising a head part (11) and a holding device (12), which holding device comprises at least one holding lever (13a, 13b) with at least one holding structure (17); and which headrest device comprises at least one guide device (19a, 19b) for guiding and supporting the holding lever (13a, 13b); which headrest device comprises a locking device (15) with a locking element (16) and the holding structure (17), which locking element is assigned to the guide device (19a, 19b), which locking element (16) in a locking position engages with the holding structure (17) and in a release position disengages from the holding structure (17); characterized in that, The guide device (19a, 19b) is formed as a guide device according to one of claims 1 to 10 and has a locking structure (21), and the holding structure (17) has at least one entraining face (34, 35) which cooperates with a mating face (32, 33) of the locking element (16).

12. The headrest device of claim 11, wherein The holding structure (22) and the locking structure (21) interlockingly cooperate.

13. The headrest device of claim 11, wherein The holding structure (17) and the locking structure (21) are at least partially complementarily formed.

14. Headrest device according to one of claims 11 to 13, characterized in that The holding device (12) has two holding levers (13a, 13b) or two free end regions of a holding lever arc.

15. A headrest device according to any one of claims 11 to 13, wherein At least one holding lever (13a, 13b) or one free end region has at least one arrangement of holding structures (17).

16. The headrest device of claim 15, wherein One locking element (16) is assigned to each arrangement.

17. The headrest device of claim 11, wherein The seat is a vehicle seat.

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