Thin headrest device

Abstract

The present invention discloses a thin headrest device, which may include: a fixed guide bracket, which is arranged above a seat back; a movable plate, a first end of which is guided by the fixed guide bracket to move forward and backward, and a second end of the movable plate is formed into an upwardly curved shape; and a movable guide bracket, the headrest is installed to the movable guide bracket, and the movable guide bracket is guided by the second end of the movable plate to move up and down.

Description

Technical Field

[0001] The invention relates to a thin headrest device, which realizes thinning of the headrest thickness by improving the front-back and up-down adjustment structure of the headrest device and improves the operability of the front-back adjustment and up-down adjustment of the headrest. Background Art

[0002] The seat of the vehicle includes a seat cushion that supports the lower body of the passenger, a seat back that supports the upper body of the passenger, and a headrest that supports the back of the passenger's head to prevent neck injuries.

[0003] A pair of pillars are provided in the headrest, which protrude downward from the headrest to be inserted into the interior of the seat back from the upper end portion of the seat back, a guide for guiding the up and down movement of each pillar is provided at the upper end portion of the seat back, and a height adjustment device is provided to perform height adjustment of the headrest by limiting the protruding length of the pillar.

[0004] Furthermore, a sliding device and an active headrest device are provided. The sliding device is configured to adjust the position of the headrest forward and backward, and the active headrest device is configured to automatically adjust the headrest to an optimal position when the vehicle collides or rear-ends.

[0005] However, in the case of a conventional headrest, since the size of the front-rear adjustment mechanism is large, the appearance shape of the headrest is thick. Therefore, it is difficult to realize the design of a thin headrest.

[0006] Particularly, in the case of the conventional front-rear adjustment mechanism of the headrest, when the headrest is forcibly moved forward, the headrest is not locked at the frontmost portion, and the headrest easily returns to the original position due to rotational inertia.

[0007] In addition, in the conventional up-and-down adjustment mechanism of the headrest, the pillar is a structure locked to the injection-molded guide, and the size of the injection-molded guide may change according to environmental conditions. When the contact portion of the guide with the pillar becomes loose, a rattling sound may be generated, and when the contact portion of the guide with the pillar becomes tight, the operating force becomes excessive.

[0008] The information included in this Background section of the present invention is only for enhancement of understanding of the general background of the invention and should not be taken as an admission or any form of suggestion that this information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0009] Various aspects of the present invention are directed to providing a thin headrest device, which realizes thinning of the headrest thickness by improving the front-rear and up-down adjustment structure of the headrest device and improves the operability of the front-rear and up-down adjustment of the headrest.

[0010] In various aspects of the present invention, a thin headrest device is provided, which includes: a fixed guide bracket arranged above a seat back; a movable plate, a first end of the movable plate moves forward and backward by being guided by the fixed guide bracket, and a second end of the movable plate is formed into an upwardly curved shape; and a movable guide bracket, a headrest is mounted to the movable guide bracket, and the movable guide bracket is coupled to the movable plate, wherein the movable guide bracket moves up and down by being guided by the second end of the movable plate.

[0011] The device may further include: a first ratchet, rotatably mounted to a fixed guide bracket; a first ratchet gear, formed on the movable plate, the first ratchet gear and the first ratchet forming a snap-fit ​​structure in a shape that allows the movable plate to move forward and limits the movable plate from moving backward; and a first leaf spring, which rotates in conjunction with the first ratchet as it contacts the first ratchet at the maximum forward movement position of the movable plate, and the first ratchet is released from the first ratchet gear, thereby allowing the movable plate to move backward.

[0012] The operation space portion may be formed by drilling a middle portion of the moving plate, the first ratchet may be disposed in the middle portion of the operation space portion, the first ratchet gear may be formed on an inner wall surface of the operation space portion, and the first leaf spring may be disposed along the first ratchet gear.

[0013] The first ratchet can be combined with the hinge shaft in a direction orthogonal to the moving direction of the moving plate to perform hinge rotation, and the first ratchet gear can be formed at a position opposite to the first ratchet so that the first ratchet is engaged in the first ratchet gear, and multiple first ratchet gears are formed along the moving direction of the moving plate, so that the first ratchet is engaged in the first ratchet gear in multiple stages.

[0014] The first end of the first ratchet wheel may be formed with a wedge-shaped engaging protrusion, the first ratchet gear may be formed with a supporting surface in a direction orthogonal to the moving direction of the moving plate, and an inclined surface may be formed inclined backward from the inner end of the supporting surface to have a tooth shape.

[0015] The device may further include: a first locking spring, which provides elastic force in the rotation direction of the first ratchet, and as the rotational displacement of the first ratchet changes, switches to any one of the rotation directions of the first ratchet in which the engaging protrusion of the first ratchet is engaged in the first ratchet gear and the rotation direction in which the engaging protrusion of the first ratchet is released from the state of being engaged in the first ratchet gear to provide elastic force.

[0016] The second end of the first ratchet may be formed with a pushing protrusion, and the second end of the first leaf spring opposite to the pushing protrusion may be formed with a releasing protrusion, so that the releasing protrusion may contact with and be pressed by the pushing protrusion, and when the releasing protrusion is pressed by the pushing protrusion, the first leaf spring may rotate while moving forward by being guided by the moving plate.

[0017] A guide protrusion can be formed in the movable plate protruding toward the first leaf spring, and a guide hole with a long hole can be formed in the first leaf spring along the front and rear moving direction of the first leaf spring. The guide protrusion can be inserted into the guide hole so that the first leaf spring can be guided and moved along the guide hole.

[0018] A rotating protrusion may be formed in the second end portion of the first leaf spring toward the movable plate, and a long groove portion and a short groove portion with different front and rear lengths and steps are formed in the second end portion of the movable plate opposite to the rotating protrusion along the rotation direction of the first leaf spring, and a rotating protrusion is provided in the long groove portion and the short groove portion, and the width of the long groove portion may be formed to be longer than the width of the rotating protrusion, so that the rotating protrusion can be rotated in the long groove portion toward the short groove portion with the guide protrusion as the center through the operation of pushing the protrusion and releasing the protrusion pressing.

[0019] A locking operation protrusion may be formed in the middle portion of the first leaf spring, wherein when the rotating protrusion rotates in the long groove portion by releasing the pressing of the protrusion, the locking operation protrusion may be positioned to overlap with a portion of the tooth groove formed at the rearmost portion of the first ratchet gear, and the engaging protrusion formed at the first end portion of the first ratchet may move forward along the inclined surface of the rearmost tooth groove to push the locking operation protrusion forward, so that the first leaf spring may move forward.

[0020] During the process of the first leaf spring moving from the rear to the front, the first leaf spring can rotate around the guide protrusion, and the rotating protrusion can move from the long groove part to the short groove part. During the process of the first leaf spring moving from the front to the rear, the first leaf spring can rotate around the guide protrusion, and the rotating protrusion can move from the short groove part to the long groove part.

[0021] In a state where the rotating protrusion is located in the short groove portion, as the pushing protrusion is pressed by the releasing protrusion, the first ratchet gear may be rotated and released from the first ratchet gear.

[0022] A release pressing portion may be formed at the front portion of the movable plate opposite to the first end portion of the first ratchet, so that the release pressing portion may contact the first end portion of the first ratchet and be pressed by the first end portion of the first ratchet, and as the release pressing portion is pressed by the first end portion of the first ratchet, the first ratchet may rotate and engage in the first ratchet gear.

[0023] The outer surface of the first ratchet extending from the first end of the first ratchet to the second end of the first ratchet can be formed with a ratchet guide surface, the first part of the ratchet guide surface including the engaging protrusion of the first ratchet can be formed as a flat surface, the second part extending from the first part can be formed as a convex surface, the third part extending from the second part can be formed as a flat surface, and the inner surface of the release pressing portion opposite to the ratchet guide surface can be formed with a plate guide surface having a shape corresponding to the ratchet guide surface, so that the rotation of the first ratchet can be guided while the ratchet guide surface is in contact with the plate guide surface.

[0024] The first end of the first leaf spring may be formed with a release operating protrusion, and at a position where the release pressing portion is pressed by the first end of the first ratchet, the release operating protrusion may be positioned to overlap a portion of a tooth groove formed at the front portion of the first ratchet gear, and as the release pressing portion presses the first end of the first ratchet, an engaging protrusion formed at the first end of the first ratchet may press the release operating protrusion located in the tooth groove, so that the first leaf spring may move backward while rotating to a locking operating position around the guide protrusion.

[0025] The device may further include: a first return spring providing elastic force in a rearward moving direction of the first leaf spring.

[0026] A bearing structure may be provided between the fixed guide bracket and the movable plate to enable the movable plate to slide forward and backward.

[0027] The bearing structure may include: a ball shell, which is formed in a shape covering a side edge portion of a movable plate and has a ball hole formed in a length direction; and a ball, which is assembled into the ball hole, and the spherical surface of the ball on one side relative to the ball hole is rollingly supported by the movable plate, and the spherical surface of the ball on the opposite side of the one side is rollingly supported by the inner surface of the fixed guide bracket.

[0028] The device may further include: a second ratchet, rotatably mounted to the movable guide bracket; a second ratchet gear, formed on the movable plate, the second ratchet gear and the second ratchet forming a snap-fit ​​structure in a shape that allows the movable guide bracket to move upward and limits the movable guide bracket from moving downward; and a second leaf spring, which rotates in conjunction with the second ratchet as it contacts the second ratchet at the maximum upward movement position of the movable guide bracket, and the second ratchet is released from the second ratchet gear, thereby allowing the movable guide bracket to move downward.

[0029] The operating space portion can be formed by drilling a middle portion of the second end portion of the movable plate, the second ratchet can be arranged in the middle portion of the operating space portion, the second ratchet gear can be formed on the inner wall surface of the operating space portion, and the second leaf spring can be arranged along the second ratchet gear.

[0030] The second ratchet can be combined with the hinge shaft in a direction orthogonal to the moving direction of the movable guide bracket to perform hinge rotation, and the second ratchet gear can be formed at a position opposite to the second ratchet so that the second ratchet is engaged in the second ratchet gear, and a plurality of second ratchet gears are formed along the moving direction of the movable guide bracket so that the second ratchet is engaged in the second ratchet gear in multiple stages.

[0031] The first end of the second ratchet wheel may be formed with a wedge-shaped engaging protrusion, the second ratchet gear may be formed with a supporting surface in a direction orthogonal to the moving direction of the moving guide bracket, and an inclined surface may be formed upwardly inclined from the inner end of the supporting surface to have a tooth shape.

[0032] The device may further include: a second locking spring, which provides elastic force in the rotation direction of the second ratchet, and as the rotational displacement of the second ratchet changes, switches to any one of the rotation directions of the second ratchet in which the engaging protrusion of the second ratchet is engaged in the second ratchet gear and the engaging protrusion of the second ratchet is released from the state of being engaged in the second ratchet gear to provide elastic force.

[0033] The second end of the second ratchet may be formed with a pushing protrusion, and the second end of the second leaf spring opposite to the pushing protrusion may be formed with a releasing protrusion, so that the releasing protrusion may contact with and be pressed by the pushing protrusion, and when the releasing protrusion is pressed by the pushing protrusion, the second leaf spring may rotate while moving downward by being guided by the moving plate.

[0034] A guide protrusion can be formed in the movable plate to protrude toward the second leaf spring, and a long guide hole can be formed in the second leaf spring along the up and down moving direction of the second leaf spring. The guide protrusion can be inserted into the guide hole so that the second leaf spring can be guided and moved along the guide hole.

[0035] A rotating protrusion may be formed in the second end portion of the second leaf spring toward the movable plate, and a long groove portion and a short groove portion with different vertical lengths and steps are formed in the upper end portion of the movable plate opposite to the rotating protrusion along the rotation direction of the first leaf spring, and a rotating protrusion is provided in the long groove portion and the short groove portion, and the width of the long groove portion may be formed to be longer than the width of the rotating protrusion, so that the rotating protrusion can be rotated in the long groove portion toward the short groove portion with the guide protrusion as the center through the operation of pushing the protrusion and releasing the protrusion pressing.

[0036] A locking operation protrusion may be formed in the middle portion of the second leaf spring, and when the rotating protrusion rotates in the long groove portion by releasing the pressing of the protrusion, the locking operation protrusion may be positioned to overlap with a portion of the uppermost tooth groove formed in the second ratchet gear, and an engaging protrusion formed at the first end of the second ratchet may move downward along the inclined surface of the uppermost tooth groove to push the locking operation protrusion downward, so that the second leaf spring may move downward.

[0037] During the process of the second leaf spring moving from the upper part to the lower part, the second leaf spring can rotate around the guide protrusion, and the rotating protrusion can move from the long groove part to the short groove part, and during the process of the second leaf spring moving from the lower part to the upper part, the second leaf spring can rotate around the guide protrusion, and the rotating protrusion can move from the short groove part to the long groove part.

[0038] In a state where the rotating protrusion is located in the short groove portion, as the pushing protrusion is pressed by the releasing protrusion, the second ratchet gear may be rotated and released from the second ratchet gear.

[0039] A release pressing portion may be formed at the lower portion of the movable plate opposite to the first end portion of the second ratchet, so that the release pressing portion may contact the first end portion of the second ratchet and be pressed by the first end portion of the second ratchet, and as the first end portion of the second ratchet is pressed by the release pressing portion, the second ratchet may rotate and engage in the second ratchet gear.

[0040] The outer surface of the second ratchet extending from the first end of the second ratchet to the second end of the second ratchet can be formed with a ratchet guide surface, the first part of the ratchet guide surface including the engaging protrusion of the second ratchet can be formed as a flat surface, the second part extending from the first part can be formed as a convex surface, the third part extending from the second part can be formed as a flat surface, and the part of the movable plate opposite to the ratchet guide surface can be formed with a plate guide surface having a shape corresponding to the ratchet guide surface, so that the rotation of the second ratchet can be guided while the ratchet guide surface is in contact with the plate guide surface.

[0041] The first end of the second leaf spring may be formed with a release operating protrusion, and at the position where the first end of the second ratchet is pressed by the release pressing portion, the release operating protrusion may be positioned to overlap with a portion of a tooth groove formed at the lower portion of the second ratchet gear, and as the first end of the second ratchet presses the release pressing portion, an engaging protrusion formed at the first end of the second ratchet may press the release operating protrusion located in the tooth groove, so that the second leaf spring may move upward while rotating to a locking operating position around the guide protrusion.

[0042] The device may further include: a second return spring providing elastic force in an upward moving direction of the second leaf spring.

[0043] According to various aspects of the present invention, a thin headrest device is provided, which includes: a fixed guide bracket arranged above a seat back; a movable plate, the headrest is mounted on the movable plate, a first end of the movable plate is moved forward and backward by being guided by the fixed guide bracket, and a second end of the movable plate is formed into an upwardly curved shape.

[0044] According to another aspect of the present invention, a thin headrest device is provided, which includes: a fixed guide bracket arranged above a seat back, and a headrest is mounted to a first end of the fixed guide bracket; and a movable guide bracket that moves up and down by being guided by a second end of the fixed guide bracket.

[0045] According to another aspect of the present invention, a thin headrest device is provided, which includes: a fixed guide bracket arranged above a seat back; and a movable plate, a first end of the movable plate moves up and down by being guided by the fixed guide bracket, and a headrest is installed on the second end of the movable plate.

[0046] The device may further include: a movable guide bracket, a first end of which is mounted with a headrest, and a second end of which moves forward and backward by being guided by a second end of a movable plate, wherein the second end of the movable plate may be formed into a shape bent forward or backward.

[0047] By the above-mentioned method for solving the problem, in an exemplary embodiment of the present invention, the front-rear and up-down adjustment mechanisms of the headrest are made compact, thereby realizing the thinning of the headrest thickness by improving the design of the headrest device. Therefore, it has the effect of maximizing the advantages in cost, weight and layout due to the thinness of the product.

[0048] Furthermore, even when the headrest is forcibly pushed to the frontmost portion during movement, the first ratchet is not released from the first ratchet gear due to rotational inertia but is engaged in the first ratchet gear located at the frontmost portion, thereby improving operability of front-rear adjustment of the headrest.

[0049] The methods and apparatus of the present invention have other features and advantages, which will become more apparent from the accompanying drawings and the following detailed description incorporated herein, or will be described in more detail in the accompanying drawings and the following detailed description incorporated herein, which together are used to explain certain principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a diagram exemplarily showing a coupling relationship between a moving plate, a moving guide bracket, and a fixed guide bracket of a first exemplary embodiment of a headrest device according to the present invention;

[0051] Figure 2 is a diagram exemplarily showing a combined structure of components for front-rear and up-down adjustment operations of a headrest device according to an exemplary embodiment of the present invention;

[0052] Figure 3 is an exploded perspective view of components applied to a headrest device according to an exemplary embodiment of the present invention;

[0053] Figure 4 is a diagram exemplarily showing a coupling structure inside a fixed guide bracket according to an exemplary embodiment of the present invention;

[0054] Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 is a diagram illustrating an operation process of performing forward movement of a headrest according to an exemplary embodiment of the present invention;

[0055] Fig.10 , Fig.11 and Fig.12 is a diagram illustrating an operation process of performing rearward movement of a headrest according to an exemplary embodiment of the present invention;

[0056] Fig.13 and Fig.14 is a diagram showing a coupling structure of components for up and down adjustment operation of a headrest device according to an exemplary embodiment of the present invention;

[0057] Fig.15 and Fig.16 are diagrams respectively illustrating forward and upward movement states of a headrest mounted to a moving guide bracket according to an exemplary embodiment of the present invention;

[0058] Fig.17 is a diagram exemplarily illustrating a configuration of a second exemplary embodiment in which a moving plate according to an exemplary embodiment of the present invention is coupled to a fixed guide bracket to achieve a front-rear adjustment operation;

[0059] Fig.18 is a diagram exemplarily illustrating a configuration of a third exemplary embodiment in which a moving guide bracket is coupled to a fixed guide bracket to achieve an up-and-down adjustment operation according to an exemplary embodiment of the present invention;

[0060] Fig.19 is a diagram exemplarily illustrating a configuration of a fourth exemplary embodiment in which a moving plate according to an exemplary embodiment of the present invention is coupled to a fixed guide bracket to achieve an up-and-down adjustment operation; and

[0061] Fig. 20 is a diagram exemplarily illustrating a configuration of a fifth exemplary embodiment in which a moving plate is coupled to a fixed guide bracket to achieve an up-and-down adjustment operation and a moving guide bracket is coupled to the moving plate to achieve a front-and-rear adjustment operation according to an exemplary embodiment of the present invention.

[0062] It will be appreciated that the drawings are not necessarily drawn to scale, presenting somewhat simplified representations of various features illustrating the basic principles of the invention. The specific design features of the present invention as incorporated herein, including, for example, specific dimensions, orientations, locations, and shapes, will be determined in part by the specific intended application and use environment.

[0063] In the drawings, like reference numerals refer to the same or equivalent parts of the present invention throughout the several figures of the drawing. DETAILED DESCRIPTION

[0064] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. Although the present invention will be described in conjunction with exemplary embodiments of the present invention, it will be understood that this specification is not intended to limit the present invention to those exemplary embodiments. On the other hand, the present invention is intended to cover not only exemplary embodiments of the present invention, but also various alternatives, modifications, equivalents and other embodiments that may be included within the scope and thought of the present invention as defined by the appended claims.

[0065] Hereinafter, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0066] The thin headrest device of the present invention includes a fixed guide bracket 20 , a movable plate 40 and a movable guide bracket 30 .

[0067] Reference Figure 1 and Figure 4 , the present invention will be described in detail. The thin headrest device includes: a fixed guide bracket 20, which is disposed above the seat back 10; a moving plate 40, a first end of which moves forward and backward by being guided by the fixed guide bracket 20, and a second end of which is formed in an upwardly curved shape; and a moving guide bracket 30, to which the headrest 60 is mounted, and the moving guide bracket 30 moves up and down by being guided by the second end of the moving plate 40.

[0068] For example, pillars 11 having a shape of being bent forward in the middle are installed on both sides of the upper portion of the seat back 10, and the fixing guide bracket 20 is combined between the pillars 11 on both sides. Therefore, the fixing guide bracket 20 may be disposed above the seat back 10.

[0069] In addition, the fixed guide bracket 20 may be composed of a pair of upper and lower brackets, and the upper and lower brackets are configured to cover the first end of the moving plate 40. The moving plate 40 is inserted between the upper and lower brackets so that the moving plate 40 can slide forward and backward.

[0070] In addition, the moving guide bracket 30 may be composed of a pair of front brackets and rear brackets, and the front brackets and rear brackets are configured to cover the second end of the moving plate 40. The moving plate 40 is inserted into the moving guide bracket 30 so that the moving guide bracket 30 can slide up and down.

[0071] That is, according to the above configuration, Fig.15 and Fig.16As shown, a movable plate 40 that can move forward and backward is provided in the fixed guide bracket 20, so that the front and rear adjustment of the headrest 60 can be performed. In addition, a movable guide bracket that can move up and down is provided on the movable plate 40, so that the up and down adjustment of the headrest 60 can be performed.

[0072] Therefore, the front-rear and up-down adjustment mechanisms of the headrest 60 are made compact, thereby achieving a thinner thickness of the headrest 60 by improving the design of the headrest device. Therefore, due to the thinning of the product, there are advantages in cost, weight and layout.

[0073] Furthermore, in order to realize the front-rear adjustment mechanism of the headrest 60 , the thin headrest device of the present invention includes a first ratchet 200 , a first ratchet gear 100 , and a first leaf spring 300 .

[0074] Reference Figure 2 and Figure 3 The thin headrest device includes: a first ratchet 200, which is rotatably mounted to the fixed guide bracket 20; a first ratchet gear 100, which is formed on the movable plate 40, and the first ratchet gear 100 and the first ratchet 200 form a snap-fit ​​structure in a shape that allows the movable plate 40 to move forward and limits the movable plate 40 from moving backward; and a first leaf spring 300, which rotates in conjunction with the first ratchet 200 as it contacts the first ratchet 200 at the maximum forward movement position of the movable plate 40, and the first ratchet 200 is released from the first ratchet gear 100, thereby allowing the movable plate 40 to move backward.

[0075] That is, when the movable plate 40 moves forward to move the headrest 60 forward, the first ratchet 200 is not engaged in the first ratchet gear 100 and the headrest 60 can be moved forward, and when the movable plate 40 moves backward, the first ratchet 200 is engaged in the first ratchet gear 100 and the headrest 60 does not move backward.

[0076] However, when the headrest 60 is moved forward to the maximum, the first ratchet 200 rotates by engaging in the first leaf spring 300 by moving the moving plate 40 forward. Therefore, the first ratchet 200 is released from the state of being engaged in the first ratchet gear 100, so that the headrest 60 can move backward.

[0077] In addition, refer to Figure 2 and Figure 3 The combination relationship of the components for realizing the front-rear adjustment mechanism will be described. The operation space portion 41 having a closed space shape is formed by drilling a middle portion of the first end portion of the moving plate 40, and the first ratchet 200 is disposed in the middle portion of the operation space portion 41.

[0078] Furthermore, the first ratchet gear 100 is formed on the inner wall surface of the operation space portion 41 along the front-rear length direction of the operation space portion 41 , and the first leaf spring 300 may be provided on the upper surface of the first ratchet gear 100 along the first ratchet gear 100 .

[0079] That is, the first ratchet 200 and the first ratchet gear 100 are disposed in the operation space portion 41 formed in the moving plate 40, and the first leaf spring 300 is disposed adjacent to the first ratchet gear 100. Therefore, the coupling structure of the front-rear adjustment mechanism becomes compact, thereby achieving a thinner device of the headrest 60.

[0080] Meanwhile, according to an exemplary embodiment of the present invention, the front-rear adjustment of the headrest 60 may be performed in multiple stages.

[0081] For this reason, Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, in an exemplary embodiment of the present invention, the first ratchet 200 is combined with the hinge shaft 210 in a direction orthogonal to the moving direction of the moving plate 40 to perform hinge rotation, and the first ratchet gear 100 is formed at a position opposite to the first ratchet 200, so that the first ratchet 200 is engaged in the first ratchet gear 100, and a plurality of first ratchet gears 100 are formed along the moving direction of the moving plate 40, so that the first ratchet 200 is engaged in the first ratchet gear 100 in multiple stages.

[0082] The first end of the first ratchet 200 is formed with a wedge-shaped engaging protrusion 220. In addition, the first ratchet gear 100 is formed with a support surface 110 in a direction orthogonal to the moving direction of the moving plate 40, and an inclined surface 120 is formed obliquely backward from the inner end of the support surface 110 to have a tooth shape.

[0083] That is, when the headrest 60 is in the rearmost basic position, the engaging protrusion 220 of the first ratchet gear 200 is in a state of being located on the inclined surface 120 of the frontmost first ratchet gear 100. In this state, when the moving plate 40 is moved forward by pulling the headrest 60 forward, the engaging protrusion 220 moves on the inclined surface 120 formed on the frontmost first ratchet gear 100 and is located in the tooth groove behind the first ratchet gear 100, and the engaging protrusion 220 is engaged with the supporting surface 110 of the frontmost first ratchet gear 100. Therefore, the headrest 60 can be locked in a state of being moved forward by one step.

[0084] By the same principle, the headrest 60 can be locked in a state of being moved forward two or three steps. Therefore, the front-back adjustment of the headrest 60 can be performed in multiple steps. However, although the front-back adjustment of the headrest 60 is shown and described as being performed in a maximum of three steps in the exemplary embodiment of the present invention, the number of steps for performing the front-back adjustment of the headrest 60 can be changed according to the number of the first ratchet gears 100.

[0085] Furthermore, the headrest device of the present invention may include the first locking spring 240 so that the operation of adjusting the headrest 60 frontward and rearward in multiple stages is more stably achieved.

[0086] For example, the first locking spring 240 provides elastic force in the rotation direction of the first ratchet 200. The first locking spring 240 is configured to provide elastic force in any one of the rotation directions of the first ratchet 200, the rotation direction in which the engaging protrusion 220 of the first ratchet 200 is engaged in the first ratchet gear 100 and the rotation direction in which the engaging protrusion 220 of the first ratchet 200 is released from the state of being engaged in the first ratchet gear 100, as the rotation displacement of the first ratchet 200 changes.

[0087] To this end, the first end of the first locking spring 240 is supported by a movable snap-fit ​​hole b in the middle part of the first ratchet 200 located in front of the hinge shaft 210, and the second end of the first locking spring 240 is supported by a fixed snap-fit ​​hole c of the fixed guide bracket 20 located in front of the first ratchet 200.

[0088] When the engaging protrusion 220 of the first ratchet 200 is engaged with the first ratchet gear 100, the movable engaging hole b is located on the inner side of the first ratchet gear 100 relative to the straight line connecting the center a of the hinge shaft 210 and the fixed engaging hole c. However, when the engaging protrusion 220 of the first ratchet 200 is released from the first ratchet gear 100, the movable engaging hole b is located on the outer side of the opposite side of the first ratchet gear 100 relative to the straight line connecting the center a of the hinge shaft 210 and the fixed engaging hole c.

[0089] That is, in Fig. 9 In the state, the movable engaging hole b is located relatively close to the first ratchet gear 100 and provides a counterclockwise elastic force to the first ratchet gear 200. Fig.10 In the state, the movable engaging hole b is located at a relatively far position from the first ratchet gear 100 and provides a clockwise elastic force to the second ratchet gear 200.

[0090] Therefore, when the engaging protrusion 220 of the first ratchet 200 is engaged in the first ratchet gear 100, the engaging protrusion 220 maintains a state of rotating toward the first ratchet gear 100 to maintain its locked state, and when the engaging protrusion 220 of the first ratchet 200 is released from the first ratchet gear 100, the engaging protrusion 220 maintains a state of rotating toward a direction away from the first ratchet gear 100 to maintain its released state.

[0091] At the same time, according to an exemplary embodiment of the present invention, a push protrusion 230 is formed at the second end of the first ratchet 200, and a release protrusion 340 is formed in the second end of the first leaf spring 300 opposite to the push protrusion 230, so that the push protrusion 230 contacts with the release protrusion 340 and is pressed by the release protrusion 340, and when the release protrusion 340 is pressed by the push protrusion 230, the first leaf spring 300 rotates while moving forward by being guided by the moving plate 40.

[0092] That is, when the moving plate 40 moves forward maximally, while the push protrusion 230 is pressed by the release protrusion 340 , the first leaf spring 300 rotates around the guide protrusion 42 to be described later.

[0093] Therefore, reference will be made to Figure 8 and Fig. 9 The forward movement and rotation structure of the first leaf spring 300 is described in detail. A guide protrusion 42 is formed protrudingly toward the first leaf spring 300 in the moving plate 40, and a guide hole 310 having a long hole is formed in the first leaf spring 300 along the forward and backward movement direction of the first leaf spring 300, and the guide protrusion 42 is inserted into the guide hole 310, so that the first leaf spring 300 is guided and moved along the guide hole 310.

[0094] That is, the guide protrusion 42 is provided in a shape fitted in the guide hole 310 formed in the first leaf spring 300. Therefore, the first leaf spring 300 moves relative to the guide protrusion 42 by being guided by the guide protrusion 42.

[0095] In addition, if Figure 8 As shown, a rotation protrusion 330 is formed in the second end of the first leaf spring 300 toward the movable plate 40, and a long groove portion 43 and a short groove portion 44 with different front and rear lengths and steps are formed in the second end of the movable plate 40 opposite to the rotation protrusion 330 along the rotation direction of the first leaf spring 300, and the rotation protrusion 330 is arranged in the long groove portion 43 and the short groove portion 44.

[0096] In this case, each of the long groove portion 43 and the short groove portion 44 is formed in a single groove shape. The long groove portion 43 is formed relatively close to the operation space portion 41 , and the short groove portion 44 having a shorter rear portion is formed on one side of the long groove portion 43 .

[0097] In addition, the width W1 of the long groove portion 43 is formed to be longer than the width W2 of the rotating protrusion 330 , so that the rotating protrusion 330 rotates in the long groove portion 43 toward the short groove portion 44 with the guide protrusion 42 as the center through the operation of the pushing protrusion 230 being pressed by the releasing protrusion 340 .

[0098] In addition, a locking operation protrusion 320 is formed at the middle portion of the first leaf spring 300, and when the rotating protrusion 330 rotates in the long groove portion 43 by pressing the release protrusion 340, the locking operation protrusion 320 is positioned to overlap a portion of the tooth groove 130 formed at the rearmost portion of the first ratchet gear 100.

[0099] Furthermore, the engaging protrusion 220 formed at the first end of the first ratchet 200 moves forward along the inclined surface 120 of the rearmost tooth groove 130 to push the locking operation protrusion 320 forward, so that the first leaf spring 300 moves forward.

[0100] That is, the engaging protrusion 220 of the first ratchet 200 pushes the locking protrusion 320 located in the rearmost tooth groove 130 forward along the inclined surface 120 of the tooth groove 130 , so that the first leaf spring 300 moves forward along the inclined surface 120 together with the locking protrusion 320 .

[0101] Therefore, if Figure 8 and Fig. 9 As shown, during the process of the first leaf spring 300 moving from the rear to the front, the first leaf spring 300 rotates around the guide protrusion 42 , and the rotation protrusion 330 moves from the long groove portion 43 to the short groove portion 44 .

[0102] In addition, in the process of the first leaf spring 300 moving from the front to the rear, the first leaf spring 300 rotates around the guide protrusion 42 , and the rotation protrusion 330 moves from the short groove portion 44 to the long groove portion 43 .

[0103] That is, when the first leaf spring 300 is moved forward by the locking operation protrusion 320 being pressed forward by the engaging protrusion 220, the rotating protrusion 330 located in the long groove portion 43 is moved forward. At the moment when the rotating protrusion 330 moves out of the long groove portion 43 as the forward movement amount of the first leaf spring 300 increases, the first leaf spring 300 rotates around the guide protrusion 42, so that the rotating protrusion 330 moves into the short groove portion 44.

[0104] At the same time, if Fig.10 As shown, according to an exemplary embodiment of the present invention, in a state where the rotating protrusion 330 is located in the short groove portion 44 , as the pushing protrusion 230 is pressed by the releasing protrusion 340 , the first ratchet 200 rotates and is released from the first ratchet gear 100 .

[0105] That is, when the first leaf spring 300 moves forward, the rotating protrusion 330 is located in the short groove portion 44 , and the releasing protrusion 340 is located at a position opposite to the pushing protrusion 230 .

[0106] Therefore, when the moving plate 40 moves forward, the release protrusion 340 contacts the push protrusion 230 and is pressed by the push protrusion 230 to rotate, through which the engaging protrusion 220 of the first ratchet 200 is released from the state of being engaged in the rearmost tooth groove 130 of the first ratchet gear 100.

[0107] In addition, refer to Fig.11 and Fig.12 A release pressing portion 45 is formed at the front portion of the movable plate 40 opposite to the first end portion of the first ratchet 200, so that the release pressing portion 45 contacts the first end portion of the first ratchet 200 and is pressed by the first end portion of the first ratchet 200, and as the release pressing portion 45 is pressed by the first end portion of the first ratchet 200, the first ratchet 200 rotates and engages in the first ratchet gear 100.

[0108] A ratchet guide surface Fr is formed on the outer surface of the first ratchet 200 extending from the first end of the first ratchet 200 to the second end of the first ratchet 200, and the ratchet guide surface Fr includes a first portion S1 of the engaging protrusion 220 of the first ratchet 200 formed as a flat surface, a second portion S2 extending from the first portion S1 formed as a convex surface, and a third portion S3 extending from the second portion S2 formed as a flat surface.

[0109] Furthermore, the inner surface of the release pressing portion 45 opposite to the ratchet guide surface Fr is formed with a plate guide surface Fp having a shape corresponding to the ratchet guide surface Fr so that the rotation of the first ratchet 200 is guided while the ratchet guide surface Fr contacts the plate guide surface Fp.

[0110] That is, when the moving plate 40 is moved backward in a state where the first ratchet 200 is released from the rearmost first ratchet gear 100 , the release pressing portion 45 contacts and is pressed by the first end of the first ratchet 200 .

[0111] Therefore, by the shapes of the plate guide surface Fp and the ratchet guide surface Fr, the ratchet guide surface Fr rotates while sliding along the plate guide surface Fp formed on the inner surface of the release pressing portion 45. Therefore, the engaging protrusion 220 of the first ratchet 200 is engaged in the tooth groove 140 of the frontmost portion of the first ratchet gear 100.

[0112] Furthermore, a release operation protrusion 350 is formed at a first end of the first leaf spring 300 and is positioned to overlap a portion of a tooth groove 140 formed at a front portion of the first ratchet gear 100 at a position where the release pressing portion 45 is pressed by the first end of the first ratchet 200 .

[0113] Therefore, as the release pressing portion 45 presses the first end of the first ratchet 200, the engaging protrusion 220 formed at the first end of the first ratchet 200 presses the release operation protrusion 350 located in the tooth groove, so that the first leaf spring 300 moves backward while rotating to the locking operation position around the guide protrusion 42. Here, in the locking operation position, the first leaf spring 300 rotates while moving backward so that the rotation protrusion 330 is located in the long groove portion 43.

[0114] That is, the engaging protrusion 220 of the first ratchet 200 pushes the release operation protrusion 350 located in the frontmost tooth groove 140 to one side, so that the first leaf spring 300 rotates together with the release operation protrusion 350 about the guide protrusion 42 .

[0115] Therefore, the rotation protrusion 330 located in the short groove portion 44 rotates toward the long groove portion 43 while moving out of the short groove portion 44, and moves into the long groove portion 43 by the force that moves the first leaf spring 300 backward, so that the first leaf spring 300 can move backward.

[0116] In addition, the headrest apparatus of the present invention may include a first return spring 360 that provides elastic force in the rearward moving direction of the first leaf spring 300 .

[0117] That is, when the engaging protrusion 220 of the first ratchet 200 pushes the release operation protrusion 350 located in the frontmost tooth groove 140 to one side and rotates, the first leaf spring 300 may move backward by the elastic force of the first return spring 360 .

[0118] Therefore, in the exemplary embodiment of the present invention, the first ratchet 200 is configured to be engaged in or released from the first ratchet gear 100 while the first ratchet 200 rotates in conjunction with the first leaf spring 300. Therefore, the mechanism for the front-rear adjustment operation of the headrest 60 becomes compact, thereby achieving the thinning of the device of the headrest 60.

[0119] According to an exemplary embodiment of the present invention, unlike a conventional headrest, even when the headrest 60 is forcibly pushed to the frontmost portion during movement, the first ratchet 200 is not released from the first ratchet gear 100 due to rotational inertia, but is engaged in the first ratchet gear 100 located at the frontmost portion, thereby improving the operability of the front-rear adjustment of the headrest 60.

[0120] Meanwhile, in an exemplary embodiment of the present invention, a bearing structure may be provided between the fixed guide bracket 20 and the moving plate 40 to enable the moving plate 40 to slide forward and backward.

[0121] The bearing structure includes: a ball shell 400, which is formed in a shape covering the side edge portion of the movable plate 40 and has a ball hole 410 formed in the length direction; and a ball 420, which is assembled into the ball hole 410, and the spherical surface of the ball on one side relative to the ball hole 410 is rollingly supported by the movable plate 40, and the spherical surface of the ball on the opposite side of the one side is rollingly supported by the inner surface of the fixed guide bracket 20.

[0122] That is, the forward and backward movement of the moving plate 40 is supported by the ball bearing structure, so that a uniform operating force can be obtained regardless of the surrounding environmental conditions. Therefore, the operating force is improved and the operating noise is reduced.

[0123] Meanwhile, in order to realize the up and down adjustment mechanism of the headrest 60 , the headrest device of the present invention includes a second ratchet 600 , a second ratchet gear 500 and a second leaf spring 700 .

[0124] Reference Fig.13 and Fig.14 The headrest device includes: a second ratchet 600, which is rotatably mounted to the movable guide bracket 30; a second ratchet gear 500, which is formed on the movable plate 40, and the second ratchet gear 500 and the second ratchet 600 form a snap-fit ​​structure in a shape that allows the movable guide bracket 30 to move upward and limits the movable guide bracket 30 from moving downward; and a second leaf spring 700, which rotates in conjunction with the second ratchet 600 as it contacts the second ratchet 600 at the maximum upward movement position of the movable guide bracket 30, and the second ratchet 600 is released from the second ratchet gear 500, thereby allowing the movable guide bracket 30 to move downward.

[0125] That is, when the movable guide bracket 30 moves upward to move the headrest 60 upward, the second ratchet 600 is not engaged in the second ratchet gear 500 and the headrest 60 can be moved upward, and when the movable guide bracket 30 moves downward, the second ratchet 600 is engaged in the second ratchet gear 500 and the headrest 60 does not move downward.

[0126] However, when the headrest 60 is moved upward to the maximum, the second ratchet 600 is engaged in the second leaf spring 700 and rotated by the operation of moving the movable guide bracket 30 upward. Therefore, the second ratchet 600 is released from the state of being engaged in the second ratchet gear 500, so that the headrest 60 can move downward.

[0127] The up-and-down adjustment mechanism of the headrest 60 is implemented in the same structure and operation method as the fore-and-aft adjustment mechanism described above, and repeated operation descriptions will be omitted.

[0128] Therefore, the combination relationship of the components of the up-down adjustment mechanism applied to the present invention will be described below. The operation space portion 51 having a closed space is formed by drilling the middle portion of the second end portion of the moving plate 40, and the second ratchet 600 is disposed in the middle portion of the operation space portion 51.

[0129] In addition, the second ratchet gear 500 is formed on the inner wall surface of the operation space portion 51 , and the second leaf spring 700 may be provided on the upper surface of the second ratchet gear 500 along the second ratchet gear 500 .

[0130] That is, the second ratchet 600 and the second ratchet gear 500 are disposed in the operation space portion 51 formed in the moving plate 40, and the second leaf spring 700 is disposed adjacent to the second ratchet gear 500. Therefore, the coupling structure of the up-and-down adjustment mechanism becomes compact, thereby achieving a thin headrest device.

[0131] Meanwhile, according to an exemplary embodiment of the present invention, the up-and-down adjustment of the headrest 60 may be performed in multiple stages.

[0132] To this end, in an exemplary embodiment of the present invention, Fig.13 and Fig.14 As shown, the second ratchet 600 is combined with the hinge shaft 610 in a direction orthogonal to the moving direction of the movable guide bracket 30 to perform hinge rotation, and the second ratchet gear 500 is formed at a position opposite to the second ratchet 600, so that the second ratchet 600 is engaged in the second ratchet gear 500, and a plurality of second ratchet gears 500 can be arranged along the moving direction of the movable guide bracket 30, so that the second ratchet 600 is engaged in the second ratchet gear 500 in multiple stages.

[0133] A wedge-shaped engaging protrusion 620 is formed at the first end of the second ratchet 600, and a supporting surface 510 is formed on the second ratchet gear 500 in a direction orthogonal to the moving direction of the movable guide bracket 30, and an inclined surface 520 is formed upwardly inclined from the inner end of the supporting surface 510 to have a tooth shape.

[0134] Furthermore, the headrest device of the present invention may include the second locking spring 640 so that the operation of adjusting the headrest 60 up and down in multiple stages is more stably achieved.

[0135] For example, the second locking spring 640 provides elastic force in the rotation direction of the second ratchet 600. The second locking spring 640 is configured to provide elastic force in any one of the rotation directions of switching to the rotation direction in which the engaging protrusion 620 of the second ratchet 600 is engaged in the second ratchet gear 500 and the rotation direction in which the engaging protrusion 620 of the second ratchet 600 is released from the state of being engaged in the second ratchet gear 500 as the rotation displacement of the second ratchet 600 changes.

[0136] At the same time, according to an exemplary embodiment of the present invention, a push protrusion 630 is formed at the second end of the second ratchet 600, and a release protrusion 740 is formed at the second end of the second leaf spring 700 opposite to the push protrusion 630, so that the release protrusion 740 contacts the push protrusion 630 and is pressed by the push protrusion 630, and when the release protrusion 740 is pressed by the push protrusion 630, the second leaf spring 700 rotates while moving downward by being guided by the movable plate 40.

[0137] Therefore, the upward movement and rotation structure of the second leaf spring 700 will be described in detail. A guide protrusion 52 is formed protrudingly toward the second leaf spring 700 in the moving plate 40, and a guide hole 710 having a long hole is formed in the second leaf spring 700 along the up and down movement direction of the second leaf spring 700, and the guide protrusion 52 is inserted into the guide hole 710, so that the second leaf spring 700 is guided and moved along the guide hole 710.

[0138] In addition, a rotation protrusion 730 is formed in the second end of the second leaf spring 700 toward the movable plate 40, and a long groove portion 53 and a short groove portion 54 with different vertical lengths and steps are formed in the upper end of the movable plate 40 opposite to the rotation protrusion 730 along the rotation direction of the first leaf spring 300, and the rotation protrusion 730 is arranged in the long groove portion 53 and the short groove portion 54.

[0139] In addition, the width of the long groove portion 53 is formed to be longer than the width of the rotating protrusion 730, so that the rotating protrusion 730 rotates in the long groove portion 53 toward the short groove portion 54 with the guide protrusion 52 as the center through the operation of the pushing protrusion 630 being pressed by the releasing protrusion 740.

[0140] In addition, a locking operation protrusion 720 is formed at the middle portion of the second leaf spring 700, and when the rotating protrusion 730 rotates in the long groove portion 53 by pressing the release protrusion 740, the locking operation protrusion 720 is positioned to overlap a portion of the tooth groove 530 formed at the uppermost portion of the second ratchet gear 500.

[0141] Furthermore, the engaging protrusion 620 formed at the first end of the second ratchet 600 moves downward along the inclined surface 520 of the uppermost tooth groove 530 to push the locking operation protrusion 720 downward, so that the second leaf spring 700 moves downward.

[0142] In the process of the second leaf spring 700 moving from the upper part to the lower part, the second leaf spring 700 rotates around the guide protrusion 52 , and the rotation protrusion 730 moves from the long groove portion 53 to the short groove portion 54 .

[0143] In addition, during the process of the second leaf spring 700 moving from the lower portion to the upper portion, the second leaf spring 700 rotates around the guide protrusion 52 , and the rotation protrusion 730 moves from the short groove portion 54 to the long groove portion 53 .

[0144] Meanwhile, according to an exemplary embodiment of the present invention, in a state where the rotating protrusion 730 is located in the short groove portion 54 , as the pushing protrusion 630 is pressed by the releasing protrusion 740 , the second ratchet 600 rotates and is released from the second ratchet gear 500 .

[0145] In addition, a release pressing portion 55 is formed at the lower portion of the movable plate 40 opposite to the first end portion of the second ratchet 600, so that the first end portion of the second ratchet 600 contacts the release pressing portion 55 and is pressed by the release pressing portion 55, and as the first end portion of the second ratchet 600 is pressed by the release pressing portion 55, the second ratchet 600 rotates and engages in the second ratchet gear 500.

[0146] The outer surface of the second ratchet 600 extending from the first end of the second ratchet 600 to the second end of the second ratchet 600 is formed with a ratchet guide surface Fr, and the ratchet guide surface Fr includes a first portion T1 of the engaging protrusion 620 of the second ratchet 600 formed as a flat surface, a second portion T2 extending from the first portion T1 formed as a convex surface, and a third portion T3 extending from the second portion T2 formed as a flat surface.

[0147] Furthermore, a portion of the moving plate 40 opposite to the ratchet guide surface Fr is formed with a plate guide surface Fp having a shape corresponding to the ratchet guide surface Fr so that the rotation of the second ratchet 600 is guided while the ratchet guide surface Fr is in contact with the plate guide surface Fp.

[0148] Furthermore, a release operation protrusion 750 is formed at a first end portion of the second leaf spring 700 , and the release operation protrusion 750 is positioned to overlap a portion of a tooth groove formed at a lower portion of the second ratchet gear 500 at a position where the first end portion of the second ratchet 600 is pressed by the release pressing portion 55 .

[0149] Therefore, as the first end of the second ratchet 600 presses the release pressing portion 55, the engaging protrusion 620 formed at the first end of the second ratchet 600 presses the release operation protrusion 750 located in the tooth groove, so that the second leaf spring 700 moves upward while rotating to the locking operation position around the guide protrusion 52. Here, in the locking operation position, the second leaf spring 700 rotates while moving upward so that the rotation protrusion 730 is located in the long groove portion 53.

[0150] In addition, the headrest apparatus of the present invention may include a second return spring 760 that provides elastic force in the upward moving direction of the second leaf spring 700 .

[0151] Meanwhile, the operation of moving the headrest 60 forward in the exemplary embodiment of the present invention will be described. Figure 5 In the embodiment of the present invention, the headrest 60 is located at the rearmost portion. In this state, when the headrest 60 moves forward, the moving plate 40 moves forward together with the headrest 60.

[0152] Therefore, the engaging protrusion 220 of the first ratchet 200 slides on the inclined surface 120 of the frontmost first ratchet gear 100, so that the engaging protrusion 220 is engaged in the tooth groove behind the frontmost first ratchet gear 100, and the headrest 60 is locked in the front first stage position, as shown in FIG. Figure 6 shown.

[0153] Next, in Figure 6 In the state, when the headrest 60 moves forward again, the engaging protrusion 220 slides on the inclined surface 120 of the first ratchet gear 100 behind, so that the engaging protrusion 220 is engaged in the tooth groove behind the inclined surface 120, and as shown in FIG. Figure 7 The head restraint 60 is shown locked in the forward second stage position.

[0154] Next, in Figure 7 In the state of the headrest 60, when the headrest 60 moves forward again, the engaging protrusion 220 slides on the inclined surface 120 of the rear first ratchet gear 100.

[0155] In this case, if Figure 8 As shown, when the moving plate 40 moves forward to the maximum, the pushing protrusion 230 formed on the first ratchet 200 is pressed by the releasing protrusion 340 formed on the first leaf spring 300, and the rotating protrusion 330 formed on the first leaf spring 300 rotates clockwise in the long groove portion 43 with the guide protrusion 42 as the center.

[0156] Therefore, once the first leaf spring 300 rotates clockwise, the engaging protrusion 220 of the first ratchet 200 moves to the position of the rearmost tooth groove 130. The locking operation protrusion 320 is located at the rearmost tooth groove 130, so that the engaging protrusion 220 pushes the locking operation protrusion 320 forward while moving along the inclined surface 120 of the rearmost tooth groove 130.

[0157] Therefore, as the rotating protrusion 330 moves forward together, the rotating protrusion 330 moves from the long groove portion 43 to the short groove portion 44. In the process of the rotating protrusion 330 moving from the long groove portion 43 to the short groove portion 44, the first leaf spring 300 moves forward while rotating around the guide protrusion 42, so that the headrest 60 is Fig. 9 Shown locked in the frontmost position.

[0158] Therefore, according to an exemplary embodiment of the present invention, unlike a conventional headrest, even when the headrest 60 is forcibly pushed to the frontmost portion during movement, the first ratchet 200 is not released from the first ratchet gear 100 due to rotational inertia, but is engaged in the first ratchet gear 100 located at the frontmost portion, thereby improving the operability of the front-rear adjustment of the headrest 60.

[0159] Furthermore, the operation of moving the headrest 60 rearward will be described. Fig. 9 In the state of, when the headrest 60 moves forward, the release protrusion 340 pushes the push protrusion 230, and the first ratchet 200 rotates clockwise, so that Fig.10 The engaging protrusion 220 is shown to be released from the state of being engaged in the first ratchet gear 100 .

[0160] Therefore, if Fig.11 As shown, the moving plate 40 and the first leaf spring 300 move backward together.

[0161] Therefore, if Fig.12 As shown, the ratchet guide surface Fr of the first ratchet 200 contacts and is guided by the plate guide surface Fp, so that the first ratchet 200 rotates counterclockwise and the engaging protrusion 220 is engaged in the frontmost tooth groove 140 .

[0162] In this case, if Fig.10 As shown, the release operation protrusion 350 is located in the frontmost tooth groove 140, so that the engaging protrusion 220 pushes the release operation protrusion 350 to one side.

[0163] Therefore, the first leaf spring 300 moves backward while rotating around the guide protrusion 42. Therefore, the rotation protrusion 330 located in the short groove portion 44 moves into the long groove portion 43 and returns to the Figure 5 status.

[0164] at the same time, Fig.17 1 is a diagram exemplarily showing the configuration of a second exemplary embodiment in which a moving plate is coupled to a fixed guide bracket to achieve a front-rear adjustment operation. The thin headrest device includes: a fixed guide bracket 20 disposed above a seat back 10; and a moving plate 40 to which the headrest is mounted, a first end portion of the moving plate being moved front-rear by being guided by the fixed guide bracket 20, and a second end portion of the moving plate being formed in an upwardly curved shape.

[0165] That is, the front-rear adjustment operation mechanism of the moving plate 40 is implemented with the same operation principle as the operation mechanism of the moving plate 40 of the first exemplary embodiment described above. However, the up-and-down adjustment operation mechanism is not implemented at the curved end of the moving plate 40, and the headrest is directly mounted to the curved end of the moving plate 40.

[0166] Fig.181 is a diagram exemplarily showing the configuration of a third exemplary embodiment in which a movable guide bracket is coupled to a fixed guide bracket to achieve an up-and-down adjustment operation. The thin headrest device includes: a fixed guide bracket 20 disposed above a seat back 10, a headrest mounted to a first end of the fixed guide bracket 20; and a movable guide bracket 30 that moves up and down by being guided by a second end of the fixed guide bracket 20.

[0167] That is, the up and down adjustment operating mechanism of the movable guide bracket 30 is implemented by the same operating principle as the operating mechanism of the movable guide bracket 30 of the above-mentioned first exemplary embodiment, but the up and down adjustment operating mechanism is not implemented in the fixed guide bracket 20 connecting the pillar to the movable guide bracket, but has a fixed state structure.

[0168] Fig.19 1 is a diagram exemplarily showing the configuration of a fourth exemplary embodiment in which a moving plate is coupled to a fixed guide bracket to achieve an up-and-down adjustment operation. The thin headrest device of the present invention comprises: a fixed guide bracket 20 disposed above a seat back 10; and a moving plate 40, a first end of which moves up and down by being guided by the fixed guide bracket 20, and a headrest is mounted on a second end of the moving plate 40.

[0169] To this end, the pillars 11 are mounted to both sides of the upper portion of the seat back 10 in the vertical length direction of the seat back 10 , and the fixing guide brackets 20 are coupled between the pillars 11 at both sides.

[0170] In addition, the moving plate 40 is configured such that the lower end portion of the moving plate 40 is inserted into the fixed guide bracket 20 and can slide up and down.

[0171] That is, the up-and-down adjustment operation mechanism of the moving plate 40 is realized with the same operation principle as the front-and-rear operation mechanism of the moving plate 40 of the above-described first exemplary embodiment.

[0172] Fig. 20 1 is a diagram exemplarily showing the configuration of a fifth exemplary embodiment in which a moving plate is coupled to a fixed guide bracket to achieve an up-and-down adjustment operation and a moving guide bracket is coupled to the moving plate to achieve a front-and-rear adjustment operation. The thin headrest device includes: a fixed guide bracket 20, which is disposed above a seat back 10; a moving plate 40, a first end of which moves up and down by being guided by the fixed guide bracket 20, and a second end of which is formed in a shape bent forward or backward; and a moving guide bracket 30, a first end of which is mounted with a headrest, and a second end of which moves forward and backward by being guided by the second end of the moving plate 40.

[0173] To this end, the pillars 11 are mounted to both sides of the upper portion of the seat back 10 in the vertical length direction of the seat back 10 , and the fixing guide brackets 20 are coupled between the pillars 11 at both sides.

[0174] In addition, the moving plate 40 is configured such that the lower end portion of the moving plate 40 is inserted into the fixed guide bracket 20 to be able to slide up and down.

[0175] In addition, the bent portion of the moving plate 40 is inserted into the moving guide bracket 30, and thus, the moving guide bracket 30 can slide forward and backward.

[0176] That is, the up-and-down adjustment operation of the moving plate 40 is realized by the same operating principle as the front-and-back adjustment operating mechanism of the moving plate 40 of the first exemplary embodiment described above. In addition, the front-and-back adjustment operation of the moving guide bracket 30 is realized by the same operating principle as the up-and-down adjustment operating mechanism of the moving guide bracket 30 of the first exemplary embodiment described above.

[0177] Although exemplary embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as included in the accompanying claims.

[0178] For convenience of explanation and accurate definition in the appended claims, the terms "upper", "lower", "inner", "outer", "above", "below", "upward", "downward", "front", "rear", "back", "inner", "outer", "inwardly", "outwardly", "inner", "external", "inwardly", "outwardly", "forward" and "rearward" are used to describe features of the exemplary embodiments shown in the drawings with reference to their positions. It will also be understood that the term "connect" or its derivatives refer to both direct and indirect connections.

[0179] For the purpose of illustration and description, the foregoing description of specific exemplary embodiments of the present invention has been given. The foregoing description is not intended to be exhaustive or to limit the present invention to the precise form disclosed, and it is apparent that many modifications and variations can be made in light of the above teachings. Exemplary embodiments are selected and described to explain certain principles of the present invention and their practical applications so that those skilled in the art can make and utilize various exemplary embodiments of the present invention and various alternative forms and modifications thereof. The scope of the present invention is intended to be defined by the appended claims and their equivalents.

Claims

1. A headrest device, comprising: A fixed guide bracket is arranged above the seat back; a moving plate, a first end portion of the moving plate being guided by the fixed guide bracket to move forward and backward, and a second end portion of the moving plate being formed into an upwardly curved shape; a moving guide bracket to which the headrest is mounted and which is coupled to the moving plate, wherein the moving guide bracket moves up and down by being guided by the second end portion of the moving plate; a first ratchet wheel rotatably mounted to the fixed guide bracket; A first ratchet gear is formed on the moving plate, the first ratchet gear and the first ratchet wheel forming a snap-fit ​​structure of a shape that allows the moving plate to move forward and restricts the moving plate from moving backward; and a first plate elastic member having a first end and a second end, and rotating in conjunction with the first ratchet wheel as it contacts the first ratchet wheel at the maximum forward movement position of the moving plate, the first ratchet wheel being released from the first ratchet gear, thereby allowing the moving plate to move backward, Wherein, a pushing protrusion is formed on the second end of the first ratchet wheel. A release protrusion is formed at a second end portion of the first plate elastic member opposite to the push protrusion so that the release protrusion selectively contacts with and is pressed by the push protrusion, When the release protrusion is pressed by the push protrusion, the first plate elastic member rotates while moving forward by being guided by the moving plate, A guide protrusion is formed in the moving plate so as to protrude toward the first plate elastic member, A guide hole having a long hole is formed in the first plate elastic member along the front-rear moving direction of the first plate elastic member, The guide protrusion is inserted into the guide hole so that the first plate elastic member is guided to move along the guide hole, A rotation protrusion is formed in the second end of the first plate elastic member toward the movable plate, and a long groove portion and a short groove portion having different front and rear lengths and steps are formed in the second end of the movable plate opposite to the rotation protrusion along the rotation direction of the first plate elastic member, and the rotation protrusion is provided in the long groove portion and the short groove portion. The width of the long groove portion is formed to be longer than the width of the rotating protrusion, so that the rotating protrusion rotates in the long groove portion toward the short groove portion with the guide protrusion as the center through the operation of the pushing protrusion being pressed by the releasing protrusion. A locking operation protrusion is formed at a middle portion of the first plate elastic member, and in a state where the rotating protrusion rotates in the long groove portion by being pressed by the releasing protrusion, the locking operation protrusion is positioned to overlap a portion of a tooth groove formed at a rearmost portion of the first ratchet gear, The engaging protrusion formed at the first end of the first ratchet moves forward along the inclined surface of the rearmost tooth groove to push the locking operation protrusion forward, so that the first plate elastic member moves forward. In the process of the first plate elastic member moving from the rear to the front, the first plate elastic member rotates around the guide protrusion, the rotation protrusion moves from the long groove portion to the short groove portion, and In a state where the rotating protrusion is located in the short groove portion, as the pushing protrusion is pressed by the releasing protrusion, the first ratchet gear rotates and is released from the first ratchet gear.

2. The device according to claim 1, wherein: The operation space is formed by drilling a hole in the middle of the movable plate. The first ratchet is arranged in the middle part of the operation space portion. The first ratchet gear is formed on the inner wall surface of the operation space portion, The first plate elastic member is disposed along the first ratchet gear, The first ratchet wheel is coupled to the hinge shaft in a direction perpendicular to the moving direction of the moving plate to perform hinge rotation. The first ratchet gear is formed at a position opposite to the first ratchet wheel, so that the first ratchet wheel is engaged in the first ratchet gear, and a plurality of the first ratchet gears are formed along the moving direction of the moving plate, so that the first ratchet wheel is engaged in the first ratchet gear in multiple stages. A wedge-shaped engaging protrusion is formed on the first end of the first ratchet, and The first ratchet gear is formed with a support surface in a direction orthogonal to a moving direction of the moving plate, and an inclined surface is formed obliquely rearward from an inner end portion of the support surface to have a tooth shape.

3. The apparatus according to claim 2, further comprising: The first locking elastic member provides elastic force in the rotation direction of the first ratchet wheel, and as the rotational displacement of the first ratchet wheel changes, it switches to any one of the rotation directions of the first ratchet wheel in which the engaging protrusion is engaged in the first ratchet gear and the rotation direction in which the engaging protrusion of the first ratchet wheel is released from the state of being engaged in the first ratchet gear to provide elastic force.

4. The device according to claim 1, wherein: In a process in which the first plate elastic member moves from the front to the rear, the first plate elastic member rotates around the guide protrusion, and the rotation protrusion moves from the short groove portion to the long groove portion.

5. The device according to claim 1, wherein: A release pressing portion is formed at the front portion of the moving plate opposite to the first end portion of the first ratchet wheel, so that the release pressing portion selectively contacts with the first end portion of the first ratchet wheel and is pressed by the first end portion of the first ratchet wheel, As the release pressing portion is pressed by the first end of the first ratchet wheel, the first ratchet wheel rotates and engages in the first ratchet gear. A ratchet guide surface is formed on an outer surface of the first ratchet extending from the first end of the first ratchet to the second end of the first ratchet, a first portion including a snap-in protrusion of the first ratchet is formed as a flat surface, a second portion extending from the first portion is formed as a convex surface, and a third portion extending from the second portion is formed as a flat surface. The inner surface of the release pressing portion opposite to the ratchet guide surface is formed with a plate guide surface having a shape corresponding to the ratchet guide surface so that the rotation of the first ratchet is guided while the ratchet guide surface is in contact with the plate guide surface. A release operation protrusion is formed at a first end portion of the first plate elastic member, The release operation protrusion is positioned to overlap a portion of a tooth groove formed at a front portion of the first ratchet gear at a position where the release pressing portion is pressed by the first end portion of the first ratchet gear, and As the release pressing portion presses the first end of the first ratchet, the engaging protrusion formed at the first end of the first ratchet presses the release operation protrusion located in the tooth groove, so that the first plate elastic member moves backward while rotating to the locking operation position around the guide protrusion.

6. The device according to claim 5, further comprising: The first return elastic member provides an elastic force in a rearward moving direction of the first plate elastic member.

7. The device according to claim 1, wherein: A bearing structure is provided between the fixed guide bracket and the movable plate so as to enable the movable plate to slide forward and backward.

8. A headrest device, comprising: A fixed guide bracket is arranged above the seat back; a moving plate, a first end portion of the moving plate being guided by the fixed guide bracket to move forward and backward, and a second end portion of the moving plate being formed into an upwardly curved shape; a moving guide bracket to which the headrest is mounted and which is coupled to the moving plate, wherein the moving guide bracket moves up and down by being guided by the second end portion of the moving plate; a second ratchet wheel rotatably mounted to the movable guide bracket; A second ratchet gear is formed on the movable plate, the second ratchet gear and the second ratchet wheel forming a snap-fit ​​structure of a shape that allows the movable guide bracket to move upward and restricts the movable guide bracket from moving downward; and a second plate elastic member having a first end and a second end, and rotating in conjunction with the second ratchet wheel as it contacts the second ratchet wheel at the maximum upward movement position of the movable guide bracket, the second ratchet wheel being released from the second ratchet gear, thereby allowing the movable guide bracket to move downward, The second end of the second ratchet wheel is formed with a pushing protrusion, A release protrusion is formed at a second end portion of the second plate elastic member opposite to the push protrusion so that the release protrusion contacts with and is pressed by the push protrusion, When the release protrusion is pressed by the push protrusion, the second plate elastic member rotates while moving downward by being guided by the moving plate, A guide protrusion is formed in the moving plate so as to protrude toward the second plate elastic member, A guide hole having a long hole is formed in the second plate elastic member along the up-and-down movement direction of the second plate elastic member, The guide protrusion is inserted into the guide hole so that the second plate elastic member is guided to move along the guide hole, A rotation protrusion is formed in the second end portion of the second plate elastic member toward the moving plate, and a long groove portion and a short groove portion having different vertical lengths and steps are formed in the upper end portion of the moving plate opposite to the rotation protrusion along the rotation direction of the second plate elastic member, and the rotation protrusion is provided in the long groove portion and the short groove portion. The width of the long groove portion is formed to be longer than the width of the rotating protrusion, so that the rotating protrusion rotates in the long groove portion toward the short groove portion with the guide protrusion as the center through the operation of the pushing protrusion being pressed by the releasing protrusion. A locking operation protrusion is formed at a middle portion of the second plate elastic member, and in a state where the rotating protrusion rotates in the long groove portion by being pressed by the releasing protrusion, the locking operation protrusion is positioned to overlap a portion of a tooth groove formed at the uppermost portion of the second ratchet gear, The engaging protrusion formed at the first end of the second ratchet moves downward along the inclined surface of the uppermost tooth groove to push the locking operation protrusion downward, so that the second plate elastic member moves downward. In the process of the second plate elastic member moving from the upper part to the lower part, the second plate elastic member rotates around the guide protrusion, the rotation protrusion moves from the long groove part to the short groove part, and In a state where the rotating protrusion is located in the short groove portion, as the pushing protrusion is pressed by the releasing protrusion, the second ratchet gear rotates and is released from the second ratchet gear.

9. The apparatus according to claim 8, further comprising: The second locking elastic member has a first end and a second end, and provides elastic force in the rotation direction of the second ratchet wheel, and switches to any one of a rotation direction in which the engaging protrusion of the second ratchet wheel is engaged with the second ratchet gear and a rotation direction in which the engaging protrusion of the second ratchet wheel is released from the state of being engaged with the second ratchet gear to provide elastic force as the rotation displacement of the second ratchet wheel changes. In the process where the second plate elastic member moves from the lower part to the upper part, the second plate elastic member rotates around the guide protrusion, and the rotation protrusion moves from the short groove part to the long groove part.

10. The device according to claim 8, wherein: A release pressing portion is formed at a lower portion of the moving plate opposite to the first end portion of the second ratchet wheel, so that the first end portion of the second ratchet wheel contacts and is pressed by the release pressing portion, and As the first end portion of the second ratchet wheel is pressed by the release pressing portion, the second ratchet wheel rotates and engages with the second ratchet gear.

11. The device according to claim 10, wherein: The outer surface of the second ratchet extending from the first end of the second ratchet to the second end of the second ratchet is formed with a ratchet guide surface, a first portion including the engaging protrusion of the second ratchet is formed as a flat surface, a second portion extending from the first portion is formed as a convex surface, and a third portion extending from the second portion is formed as a flat surface, and A portion of the moving plate opposite to the ratchet guide surface is formed with a plate guide surface having a shape corresponding to the ratchet guide surface so that the rotation of the second ratchet is guided while the ratchet guide surface is in contact with the plate guide surface.

12. The device according to claim 9, wherein: The first end portion of the second plate elastic member is formed with a release operation protrusion, The release operation protrusion is positioned to overlap a portion of a tooth groove formed at a lower portion of the second ratchet gear at a position where the first end portion of the second ratchet gear is pressed by the release pressing portion, and As the first end of the second ratchet presses the release pressing portion, the engaging protrusion formed at the first end of the second ratchet presses the release operating protrusion located in the tooth groove, so that the second plate elastic member moves upward while rotating to the locking operating position around the guide protrusion.

13. The apparatus according to claim 12, further comprising: The second return elastic member provides an elastic force in an upward moving direction of the second plate elastic member.

14. The device according to claim 8, wherein: A bearing structure is provided between the fixed guide bracket and the movable plate so as to enable the movable plate to slide forward and backward.

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