Headrest height adjusting device and chair comprising same

Abstract

The present invention relates to a headrest height adjusting device and a chair comprising the same, and more particularly, to a headrest height adjusting device comprising: a mounting part formed on the back surface of a headrest main body so as to be recessed forward; support members disposed at the left and right end portions of the mounting portion; a height adjustment guide block inserted between the back surface of the headrest main body corresponding to the mounting part and the support member; and a friction force generation unit which is coupled to the front surfaces of a pair of guide protrusion ends corresponding to the left and right end portions of the height adjustment guide block, contacts the back surface of the headrest main body corresponding to the mounting unit, and generates a friction force corresponding to a reaction force of an initial actuation force provided by a user, the friction force generation unit being coupled to the front surfaces of a pair of guide protrusion ends corresponding to the left and right end portions of the height adjustment guide block. Accordingly, user convenience is improved and generation of operation noise can be prevented.

Description

Technical Field

[0001] The present invention relates to a headrest height adjustment device and a chair including the same, and more particularly to a headrest height adjustment device and a chair including the same, which can not only easily adjust the height of the headrest but also stably stop at a position desired by the user and can reduce trial and error in operation. Background Art

[0002] Typically, a headrest or a neck rest (hereinafter, collectively referred to as a "headrest") is combined on the upper side of the backrest of the chair to support the head or neck of the user.

[0003] The user's sitting posture when sitting on the chair is divided into a working posture and a resting posture. Basically, the user changes the angle of the torso to take a short rest, and the headrest supports the user's head or neck to maintain a more comfortable posture.

[0004] Most of the headrests for chairs are fixed to the backrest or are configured to have a function of adjusting the height according to the user's body.

[0005] In particular, the height adjustment function is to adjust the height of the headrest according to the physical condition and sitting posture of the occupant, thereby providing the advantage of improving user convenience.

[0006] A typical chair having a height adjustment function is disclosed in Japanese Unexamined Patent Publication No. 10-2012-0134232 (published on December 12, 2012; hereinafter referred to as “the prior art”).

[0007] Figure 1 is a perspective view of an example of a headrest height adjustment device according to the prior art; Figure 2 yes Figure 1 A specific exploded perspective view of the headrest height adjustment device in the structure.

[0008] The headrest height adjustment device 70 according to the prior art (named as "height adjustment component" in the specification of "prior art") is as follows: Figure 1 and Figure 2 As shown, the headrest 10 is provided between the backrest portion 20 and a frame 30 configured to support the rear side of the backrest portion 20 , and the height of the installed headrest 10 is adjusted by the action of moving the support member 40 in the up-and-down direction through the mounting member 50 formed with the moving hole 52 .

[0009] In particular, the headrest height adjustment device 70 according to the prior art is composed of a slot member 72, an elastic protrusion 74, a receiving member 78, and an elastic bracket 76. Here, the slot member 72 is protrudingly formed to have a plurality of slots 73 in the vertical direction on the front side of the support member 40, and the hemispherical elastic protrusion 74 is elastically caught in the plurality of slots 73 during the vertical movement of the support member 40 to limit the height.

[0010] Here, according to the mechanism of the headrest height adjustment device 70 of the prior art, when the user adjusts the height of the headrest 10 according to his or her own physical condition (body shape), if a predetermined initial actuating force is added after clamping the headrest 10, any elastic protrusion 74 elastically stuck in the multiple slots 73 moves toward the side of the adjacent slot 73 and is stuck in the slot 73 at the position where the initial actuating force is released, and the height is adjusted by this action.

[0011] However, the headrest height adjustment device 70 of the prior art which operates by the mechanism as described above requires a predetermined stopping friction force once it is adjusted to suit the user's body shape to prevent the user from sliding down when leaning his head arbitrarily. On the contrary, the user's initial actuation force required for adjusting the height depends only on the elastic force generated by the spring 75 which elastically supports the above-mentioned elastic protrusion 73. From this point of view, it is necessary to set the above-mentioned initial actuation force (or, stopping friction force) to be larger.

[0012] Therefore, there is the following problem: when the user applies a large set initial actuation force, the elastic protrusion 74 passes over multiple slots 73 at one time, so it is difficult for the user to accurately adjust the height. In order to adjust to a height suitable for the user, multiple trial and error are required.

[0013] In addition, in order to actually adjust the height, the movable hole 52 of the mounting component 50 that guides the up and down movement of the support component 40 needs to provide a certain degree of spacing space for the front and back of the support component 40 to ensure that the support component 40 that moves in the up and down directions moves smoothly. However, there is a problem of generating high-frequency noise while the support component 40 moves back and forth during the process of adjusting the height by the user.

[0014] In particular, the frame 30 on which the mounting member 50 is provided and the frame member 32 disposed at the front end act as an echo tube when the supporting member 40 generates noise, and therefore there is a problem of further diffusing the noise. Summary of the invention

[0015] (Problem to be solved)

[0016] The present invention is proposed to solve the above-mentioned technical problems, and its purpose is to provide a headrest height adjustment device and a chair including the same, which can adjust the height of the headrest to the position desired by the user without trial and error, and can also prevent noise from being generated.

[0017] (Methods of solving the problem)

[0018] A headrest height adjustment device according to an embodiment of the present invention includes: a mounting portion formed on the back side of a headrest body so as to be recessed forward; a support component disposed at both left and right end portions of the mounting portion; a height adjustment guide block inserted between the back side of the headrest body corresponding to the mounting portion and the support component; and a friction force generating portion coupled to the front sides of both left and right end portions of the height adjustment guide block and in contact with the back side of the headrest body corresponding to the mounting portion, to generate a friction force corresponding to a reaction force of an initial actuation force provided by a user.

[0019] Here, a plurality of slots are formed in front of the support component, which are continuously recessed toward the rear in the vertical direction; a tactile buckle portion may be provided on the back of the height adjustment guide block, and the tactile buckle portion is elastically supported and clamped by the plurality of slots.

[0020] In addition, the friction force generating portion may be formed of a flexible material.

[0021] Furthermore, the friction force generating portion is formed of a friction material so as to generate a predetermined friction force between the friction force generating portion and the back surface of the headrest body corresponding to the mounting portion.

[0022] Furthermore, the friction force generating portion may have a front end that protrudes from the front surface of the height adjustment guide block to generate the friction force on the back surface of the headrest body corresponding to the mounting portion.

[0023] In addition, the tactile snap-on portion includes: an elastic block, which is inserted into and arranged in a supporting groove formed on the back side of the height adjustment guide block; a tactile roller, which is elastically supported by a predetermined elastic force through the elastic block, and a portion of the outer peripheral surface protrudes to the outside of the supporting groove to contact the snap-on portion of the supporting component; the friction force of the friction force generating portion can be set by taking into account the elastic force provided by the elastic block.

[0024] In addition, the headrest height adjustment device may further include a rear cover plate, which is coupled to the rear portion of the headrest body and has a through portion formed thereon so that the space corresponding to the mounting portion is connected to the rear.

[0025] In addition, the left and right inner ends of the through portion may be arranged to have a spacing distance that allows the support member to be hidden from the outside.

[0026] In addition, a spacing distance between an upper end of the mounting portion and an upper end of the supporting member may be greater than a vertical length of a pair of guide protrusion ends of the height adjustment guide block.

[0027] In addition, the headrest height adjustment device may further include a guide plate, which is combined with the back side of the headrest body corresponding to the mounting portion to guide the up and down movement of the height adjustment guide block.

[0028] In addition, the length between the left and right ends of the guide plate may be configured to correspond to the spacing distance between the pair of guide protrusion ends.

[0029] A chair according to an embodiment of the present invention may include the headrest height adjustment device described above.

[0030] (Effects of the Invention)

[0031] The headrest height adjustment device and the chair including the same according to an embodiment of the present invention can achieve the following various effects.

[0032] First, by adding a friction force generating unit that generates a reaction force from an initial actuation force provided by a user to adjust the height of the headrest, the headrest can be stopped at a position desired by the user without trial and error, thereby improving user convenience.

[0033] Secondly, the friction force generating portion eliminates the space between the front end and the rear end of the height adjustment guide block, thereby having an effect of preventing high-frequency noise from being generated when adjusting the height. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a perspective view of an example of a headrest height adjustment device according to the prior art;

[0035] Figure 2 yes Figure 1 A specific exploded perspective view of the headrest height adjustment device in the structure;

[0036] Figure 3 1 is a front perspective view (a) and a rear perspective view (b) showing a headrest height adjustment device according to an embodiment of the present invention;

[0037] Figure 4 yes Figure 3 (a) and (b) are exploded perspective views of each;

[0038] Figure 5a and Figure 5b 1. It is an exploded perspective view of the front and rear parts showing the installation form of the headrest height adjustment device for the back side of the headrest body;

[0039] Figure 6a and Figure 6b It is shown for Figure 5b A partially cutaway exploded perspective view of a mounting portion of the headrest height adjustment device in an installation sequence;

[0040] Figure 7 It is shown Figure 3 An exploded perspective view of the installation form of the height adjustment guide block in the structure;

[0041] Figure 8 It is shown Figure 3 An exploded perspective view of the installation form of the angle adjustment rotating block in the structure;

[0042] Figure 9a and Figure 9b It is used to illustrate Figure 3 Partial and complete exploded perspective views of the combination of the height adjustment guide block and the angle adjustment rotating block in the structure;

[0043] Fig.10a and Fig.10b It is used to illustrate Figure 3 A horizontal cross-sectional view and a vertical cross-sectional view of a combination of a height adjustment guide block and an angle adjustment rotating block in a structure;

[0044] Fig.11 It is shown Figure 3 A front view of a headrest in a structure;

[0045] Fig.12a and Figure 12b It is along Fig.11 Cross-sectional view (a) and cut-away stereogram (b) taken along line AA and line BB.

[0046] (Explanation of Reference Numerals)

[0047] 110: Headrest 111: Headrest body

[0048] 112: Mounting part 114a, 114b: Upper and lower hook holes

[0049] 116: Assembly screw 117: Support part

[0050] 117a: Slot 118: Movement limiting hook

[0051] 119: Insertion part 121: Back cover

[0052] 122: Through portion 131: Front pad

[0053] 132: Matching groove 136: Screw through hole

[0054] 150: guide plate 160: friction force generating unit

[0055] 170: Tactile buckle part 171: Elastic block

[0056] 172: Tactile Scroll Wheel DETAILED DESCRIPTION

[0057] Hereinafter, a headrest height adjustment device and a chair including the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0058] In terms of adding reference numerals to the components of each drawing, the same components should be given the same reference numerals as much as possible even if they are shown in different drawings. In addition, when describing the embodiments of the present invention, if it is determined that the specific description of the relevant known structure or function hinders the understanding of the embodiments of the present invention, the specific description will be omitted.

[0059] When describing the components of the embodiments of the present invention, the terms first, second, A, B, (a), (b), etc. may be used. Such terms are only used to distinguish one component from another component and shall not be used to limit the nature or order of the components. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by ordinary technicians in the field to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as consistent with the meaning in the relevant technical articles and shall not be interpreted in an ideal or overly formal sense unless clearly defined in this application.

[0060] Figure 3 1 is a front perspective view (a) and a rear perspective view (b) showing a headrest height adjustment device according to an embodiment of the present invention; Figure 4 yes Figure 3 (a) and (b) are exploded perspective views of each.

[0061] like Figure 3 and Figure 4 As shown, a headrest height adjustment device 140 according to an embodiment of the present invention may be combined with the headrest 110 .

[0062] In more detail, Figure 3 and Figure 4 As shown, the headrest 110 may include: a headrest body 111, which is formed to a size that supports the back of the user's head or neck and constitutes the entire skeleton; a rear cover plate 121, which is combined with the back of the headrest body 111; and a front pad 131, which is combined with the front of the headrest body 111 and directly contacts the back of the user's head or neck.

[0063] A mounting portion 112 may be disposed in the middle portion of the headrest body 111 . The mounting portion 112 has a rectangular hexahedral space that is substantially elongated vertically and thin front to back.

[0064] The mounting portion 112 protrudes forward of the headrest body 111 and is recessed forwardly at the rear of the headrest body 111. The mounting portion 112 may be recessed into a quadrilateral groove shape whose length in the up-down direction is greater than its width in the left-right direction.

[0065] The mounting portion 112 described above may be combined with a headrest height adjustment device 140 according to an embodiment of the present invention described below. The specific combination form of the headrest height adjustment device 140 with respect to the mounting portion 112 will be described in more detail below.

[0066] Support members 117 may be installed at both left and right ends of the mounting portion 112 to prevent both ends of the headrest height adjustment device 140 from falling off backward. More specifically, as described above, when the mounting portion 112 is in the shape of a quadrilateral groove protruding forward on the back side of the headrest body 111, the support members 117 are respectively fixed to the headrest body 111 corresponding to the left and right frame ends of the mounting portion 112, and the width direction ends facing each other overlap a predetermined length toward the inside of the mounting portion 112, thereby clamping the headrest height adjustment device 140 at the rear.

[0067] Here, the height of the upper end of the support member 117 may be set to be lower than the height of the upper end of the mounting portion 112 by a predetermined length. Since the height of the upper end of the support member 117 is lower than the height of the upper end of the mounting portion 112, there is a gap between them in the front-to-back direction that is not interfered by the support member 117, and the space between the upper end of the support member 117 and the upper end of the mounting portion 112 is defined as the "insertion portion 119" hereinafter. Therefore, the spacing distance between the upper end of the mounting portion 112 and the upper end of the support member 117 may be greater than the upper-lower length of a pair of guide protrusion ends 141a and 141b corresponding to the left and right end portions of the height adjustment guide block 141 described later.

[0068] At this time, the headrest height adjustment device 140 according to an embodiment of the present invention is that when the insertion portion 119 defined by the space between the upper end of the support component 117 and the upper end of the mounting portion 112 is inserted and moved downward a predetermined distance, the two end portions are respectively clamped to the rear by the support component 117, thereby being prevented from falling off to the outside.

[0069] Here, as the back side of the mounting portion 112 , the movement restricting hooks 118 may be arranged on the back side of the headrest body 111 corresponding to the insertion portion 119 , and may be engaged with both upper ends of the height adjustment guide blocks 141 described later.

[0070] The movement limiting hook portion 118 protrudes rearward to form a hook end, and when the hook end is inserted and coupled with the height adjustment guide block 141 described later through the insertion portion 119 with a predetermined insertion force, the hook end is pressurized to form a space between the support part 117 that is larger than the front and rear thickness of the height adjustment guide block 141, thereby performing the function of allowing the height adjustment guide block 141 to be inserted and coupled.

[0071] In addition, the movement limiting hook 118 is configured to move downward a predetermined distance once the height adjustment guide block 141 is inserted into the mounting portion 112, and then engage with the hook end of the movement limiting hook 118 that returns to its original position, thereby preventing it from being removed arbitrarily through the insertion portion 119.

[0072] At the same time, the movement limiting hook portion 118 can also perform the function of a limit stopper to limit the height adjustment guide block 141 installed on the installation portion 112 from moving upward.

[0073] The headrest height adjustment device 140 according to an embodiment of the present invention having the above-described structure provides the following advantages: to install the headrest 110 , there is no need to use a separate assembly tool such as a wrench, and simple assembly can be performed simply by using the movement limiting hook 118 of the insertion portion 119 .

[0074] On the other hand, Figure 3 and Figure 4 As shown, the front pad 131 may be configured to cover the front of the headrest body 111 .

[0075] Here, the front pad 131 is formed of a solid plastic at the rear end surface and can be formed into a cushion shape including a sponge material at the front. A matching groove 132 can be formed at the rear of the front pad 131 to match the mounting portion 112 protruding toward the front of the headrest body 111.

[0076] On the other hand, a rear cover plate 121 may be combined with the rear portion of the headrest body 111. The rear cover plate 121 may form a rear appearance of the headrest body 111.

[0077] At the same time, the rear cover 121 can be cut to form a rectangular through portion 122, so that the remaining portion of the headrest height adjustment device 140 according to an embodiment of the present invention installed on the mounting portion 112 of the headrest body 111, except for the portion stuck in the support component 117, is penetrated and exposed to the rear.

[0078] Here, the left and right inner ends of the through portion 122 are such that at least after the rear portion of the headrest body 111 is combined with the rear cover 121, the support components 117 arranged at the left and right end portions of the above-mentioned mounting portion 112 can be hidden from the outside when viewed in the front-to-rear direction (i.e., from the front).

[0079] According to an embodiment of the present invention, the headrest height adjustment device 140 is installed on the mounting portion 112 of the headrest body 111 at the rear through the through portion 122 of the rear cover plate 121, and can be installed so that the operating force transmitted by the user's height adjustment behavior can be moved in the upward and downward directions along the through portion 122.

[0080] As described above, through the through portion 122 of the rear cover plate 121 , the space equivalent to the installation portion 112 is completely connected to the rear, thereby preventing the installation portion 112 from acting as an echo tube during operation.

[0081] The rear cover plate 121 may be hooked and coupled to the rear portion of the headrest body 111 , and the front pad 131 may be screwed to the front portion of the headrest body 111 by a plurality of assembly screws 116 .

[0082] In order to hook and connect the headrest body 111 to the rear cover 121, the upper hook hole 114a and the lower hook hole 114b are respectively arranged in the shape of triangular vertices at three locations in the headrest body 111. Similarly, the upper hook 124a and the lower hook 124b are respectively arranged in the shape of triangular vertices at three locations on the front of the rear cover 121.

[0083] The three upper hooks 124 a and the lower hooks 124 b penetrate the three upper hook holes 114 a and the lower hook holes 114 b formed on the headrest body 111 from rear to front and are caught, and can be closely connected to the rear cover plate 121 at the rear part of the headrest body 111 .

[0084] On the other hand, in order to screw the headrest body 111 together with the front pad 131, snap button insertion holes 136 are arranged at multiple locations in the front pad 131. The snap button insertion holes 136 accommodate and interference fit the tree-shaped snap buttons 135 so as to be fastened to the front of the headrest body 111 by the assembly screws 116; screw fastening bosses 126 that are fastened by the assembly screws 116 passing through the snap button insertion holes 136 can be arranged at multiple locations in the front portion of the rear cover 121.

[0085] Before the front pad 131 is coupled to the headrest body 111, multiple assembly screws 116 are penetrated through screw through holes (no figure mark) formed in the headrest body 111 and at the same time, the tree-shaped snap buttons 135 are coupled to the front of the headrest body 111, and then they are respectively fastened to the screw fastening bosses 126 of the rear cover plate 121.

[0086] Then, the front pad 131 is pressed against the front of the headrest body 111 , and the tree-shaped snaps 135 are interference-fitted into the snap insertion holes 136 arranged on the back of the front pad 131 , so that the front pad 131 is simply coupled to the front of the headrest body 111 .

[0087] Here, when the headrest height adjustment device 140 according to an embodiment of the present invention is installed on the headrest 110, except for setting the above-mentioned tree-shaped snaps 135, no separate assembly tools such as wrenches are required, and the user can also easily combine and disassemble the front pad 131 with the headrest body 111 by interference fit, thereby providing the advantage of improving user convenience.

[0088] Figure 5a and Figure 5b 1. It is an exploded perspective view of the front and rear parts showing the installation form of the headrest height adjustment device for the back side of the headrest body; Figure 6a and Figure 6b It is shown for Figure 5b An exploded perspective view of a portion of the mounting portion of the headrest height adjustment device cut away in an installation sequence.

[0089] Reference Figures 5a to 6b The following briefly describes the process of installing the headrest height adjustment device 140 according to one embodiment of the present invention on the mounting portion 112 of the headrest body 111.

[0090] First, if Figure 5a and Figure 5b As shown, the headrest height adjustment device 140 according to an embodiment of the present invention is installed in the installation portion 112 which is a space arranged at the back of the headrest body 111 , and can be pre-installed before the rear cover plate 121 is combined with the headrest body 111 .

[0091] Here, a guide plate 150 may be pre-installed on the back side of the headrest body 111 corresponding to the mounting portion 112 to prevent the later-described height adjustment guide block 141 from rocking left and right while guiding the vertical movement in the structure of the headrest height adjustment device 140 according to an embodiment of the present invention.

[0092] A guide slot 112h extending in the vertical direction is recessed forward on both sides of the mounting portion 112, and a guide mounting rib 150h can be formed in front of the guide plate 150. The guide mounting ribs 150h are respectively inserted into a pair of guide slots 112h to prevent shaking in the left and right directions.

[0093] Preferably, the length between the left and right ends of the guide plate 150 (i.e., the length of the width) is configured to correspond to a pair of guide protrusion ends 141a and 141b (see FIG. 141B ) protruding forward from the left and right ends of the height adjustment guide block 141 described later. Figure 9a ) corresponds to the spacing distance between them.

[0094] A friction force generating portion 160 described later is arranged in front of each of the pair of guide protrusion ends 141a and 141b of the height adjustment guide block 141. When the headrest height adjustment device 140 according to one embodiment of the present invention moves up and down in the mounting portion 112, a predetermined friction force is generated at a portion corresponding to the front of the mounting portion 112 while the headrest moves. At the same time, each stepped surface (inner side surface) of the pair of guide protrusion ends 141a and 141b is guided along the left and right ends of the guide plate 150 without shaking left and right, and can move up and down stably.

[0095] On the other hand, Figure 6a As shown, the headrest height adjustment device 140 according to one embodiment of the present invention is to be located at a position where the height of the upper end of the support member 117 and the space between the upper end of the mounting portion 112 can be inserted when the rear cover plate 121 is separated from the headrest body 111, and then, as shown in FIG. Figure 6b As shown, the headrest body 111 can be easily mounted by closely contacting the back surface of the headrest body 111 forming the mounting portion 112 .

[0096] Then, although not shown, if the height adjustment guide block 141 moves downward while being in close contact with the mounting portion 112 , the movement restricting hook portion 118 can move downward through the space between the height adjustment guide block 141 and the support member 117 while being pressed.

[0097] Figure 7 It is shown Figure 3 An exploded perspective view of the installation form of the height adjustment guide block in the structure; Figure 8 It is shown Figure 3 An exploded perspective view of the installation form of the angle adjustment rotating block in the structure; Figure 9a and Figure 9b It is used to illustrate Figure 3 Partial and complete exploded perspective views of the combination of the height adjustment guide block and the angle adjustment rotating block in the structure; Fig.10a and Fig.10b It is used to illustrate Figure 3 Horizontal and vertical cross-sectional views of the combination of the height adjustment guide block and the angle adjustment rotating block in the structure.

[0098] like Figures 7 to 10b As shown, the mounting portion 112 of the headrest 110 having the structure described above may be combined with a headrest height adjustment device 140 according to an embodiment of the present invention.

[0099] like Figure 7 and Figure 8 As shown, the headrest height adjustment device 140 according to an embodiment of the present invention may include: a height adjustment guide block 141, which is inserted into and combined with the inner side of the mounting portion 112, so as to move relatively in the up and down directions inside the mounting portion 112 when the headrest 110 is moved up and down to adjust the height of the headrest 110; and an angle adjustment rotating block 144, which is rotatably connected to the height adjustment guide block 141 around the left and right horizontal axes.

[0100] like Figure 9a and Figure 9b As shown, the angle adjustment rotating block 144 may include: a hinge insertion end 144-1, which is used to be hingedly combined with the height adjustment guide block 141; and a backrest combining end 144-2, which is formed as a whole with the hinge insertion end 144-1 and is involved in the combination with the front end portion of the backrest in the structure of the chair not shown.

[0101] Here, a rotation coupling end 142 may be disposed on the back side of the height adjustment guide block 141 , and a hinge hole 142 h is formed in the rotation coupling end 142 to insert a rotation hinge shaft 145 of an angle adjustment rotation block 144 described later.

[0102] In more detail, on the back side of the height adjustment guide block 141, except for the middle part, a pair of rotating coupling ends 142 are arranged at a predetermined distance (middle part) from each other at the left and right ends, and a hinge insertion end 144-1 of the angle adjustment rotating block 144 can be provided between the spaced pair of rotating coupling ends 142 for hinge coupling.

[0103] At the same time, an anti-slip protrusion 143a in the form of a main body of a flat head screw 143 is configured inside the hinge hole 142h of the rotating coupling end 142 and protrudes toward the center side of the hinge hole, and a C-shaped ring 146 with an interference protrusion 146a can be inserted in the rotating hinge shaft 145. The interference protrusion 146a is formed by bending the front end to interfere with the anti-slip protrusion 143a.

[0104] Here, if Figure 9b As shown, the flat head screw 143 provided with the anti-drop protrusion 143a can be fastened to the main body exposed from the front to the rear of the hinge hole 142h side of the height adjustment guide block 141. The flat head screw 143 can be fastened to the screw through hole 142h-b formed through the front and rear directions of the height adjustment guide block 141.

[0105] On the other hand, a ring fixing slot 142 h - a may be formed inside the hinge hole 142 h of the rotation coupling end 142 to insert and place the interference protrusion 146 a of the C-shaped ring 146 .

[0106] The C-shaped ring 146 is an outer peripheral surface of a ring intervention portion 145b that is embedded and intervened in the structure of a rotating hinge shaft 145 described later, and a ring fixing slot 142h-a that is opened in the left and right directions in the hinge hole 142h of the rotating coupling end 142 is capable of inserting an interference protrusion 146a in an insertion direction.

[0107] At this time, the interference protrusion 146a of the C-ring 146 inserted into the ring fixing slot 142h-a is clamped by the anti-falling protrusion 143a which is configured in the shape of the main body of the flat head screw 143 in the direction opposite to the insertion direction of the C-ring 146, so it can be prevented from falling off to the outside at will.

[0108] At the same time, the C-shaped ring 146 has an interference protrusion 146a fixed in the ring fixing slot 142h-a, so when the user adjusts the angle of the headrest body 111, it can rotate in conjunction with the height adjustment guide block 141, unlike the rotating hinge shaft 145 which remains fixed to the angle adjustment rotating block 144.

[0109] Here, the inner circumference of the C-shaped ring 146 and the outer circumference of the ring intervention portion 145b of the rotating hinge shaft 145 form a predetermined rotational friction force. At the same time, when the user rotates the height adjustment guide block 141 with respect to the angle adjustment rotating block 144 in order to adjust the angle of the headrest body 111, the rotation action is allowed. If the user's operating force is eliminated, the state of stopping at this position can be maintained.

[0110] At the same time, if Figure 9a and Figure 9b As shown, the rotating hinge shaft 145 is a shaft having a front end that passes through and is fastened from the outside of each hinge hole 142h of a pair of rotating coupling ends 142, and can then be fastened to match the shaft coupling end 144-4 formed inside the fastening hole 144-3 of the hinge insertion end 144-1 in the angle adjustment rotating block 144.

[0111] In more detail, the rotating hinge shaft 145 may include: a shaft body 145a; a ring intervention portion 145b, which is arranged at the outer end of the shaft body 145a and has an outer peripheral surface with a circular cross-section to intervene in the C-shaped ring 146; and a shaft fixing portion 145c, which serves as the front end portion of the shaft body 145a and matches the shaft coupling end 144-4 of the hinge insertion end 144-1.

[0112] Here, preferably, the shaft fixing portion 145c is matched and fixed to move in the insertion direction of the left and right directions at the shaft coupling end 144-4, and has an outer side surface with a non-circular cross-section to prevent linkage and rotation through friction with the C-ring 146.

[0113] If the rotating hinge shaft 145 of the angle adjustment rotating block 144 formed by the above-mentioned structure is inserted into the hinge hole 142h of the rotating coupling end 142 arranged on the back side of the height adjustment guide block 141, the hinge cover 147 can be used to cover the open hinge hole 142h of the rotating coupling end 142 from the outside.

[0114] As described above, in the headrest height adjustment device 140 according to an embodiment of the present invention, the height adjustment guide block 141 is such that the user can couple the rotating hinge shaft 145 to one side of the opening in the hinge hole 142h of the rotating coupling end 142 without a separate tool, and the anti-detachment protrusion 143a of the flat head screw 143 prevents the C-shaped ring 146 that has been coupled to the ring intervention portion 145b from falling off. In addition, it is designed to be coupled to the hinge cover 147 in an interference fit manner, thereby providing the user with the advantage of being able to assemble more easily.

[0115] Here, the height adjustment guide block 141 includes a portion of the left and right ends disposed between the front of the mounting portion 112 and a support component 117 disposed at a predetermined distance rearwardly from the front of the mounting portion 112, thereby preventing the guide block 141 from falling backwards.

[0116] However, the height adjustment guide block 141 is fixed to a frame (not shown) constituting the unshown backrest portion via an angle adjustment rotating block 144, and therefore, preventing the headrest 110 from falling off toward the rear by the support component 117 may also include the concept of preventing the headrest 110 from falling off toward the front with respect to the height adjustment guide block 141.

[0117] Fig.11 It is shown Figure 3 A front view of a headrest in a structure; Fig.12a and Figure 12b It is along Fig.11 Cross-sectional view (a) and cut-away stereogram (b) taken along line AA and line BB.

[0118] like Figure 11 to Figure 12b As shown, a plurality of slots 117 a may be formed on the front of the supporting member 117 , and the plurality of slots 117 a are continuously arranged in the up-and-down direction and are recessed toward the rear.

[0119] Meanwhile, a tactile buckle portion 170 may be disposed on the back side of each of the left and right end portions of the height adjustment guide block 141 , and the tactile buckle portion 170 is buckled in the plurality of buckle grooves 117 a of the support member 117 to be elastically supported.

[0120] like Fig.12a As shown, the tactile buckle portion 170 may include: an elastic block 171, which is inserted into a support groove 148 formed on the back side of the two ends of the height adjustment guide block 141 and is recessed forward; a tactile roller 172, a portion of the outer peripheral surface of which protrudes to the outside of the support groove 148, and contacts any one of the multiple slots 117a of the supporting component 117 located at the rear through the elastic force of the elastic block 171.

[0121] If the user grasps the headrest 110 according to his / her body shape and moves it in the vertical direction, the support member 117 moves in the vertical direction in联动 with the headrest main body 111. At this time, the tactile roller 172 of the tactile latching portion 170 in the stopped state moves toward the adjacent card slot 117a on the side opposite to the direction of the moving support member 117 and is latched to be received in the card slot 117a when the initial driving force of the user is released.

[0122] In the headrest height adjustment device 140 according to an embodiment of the present invention, it is shown and described that a single tactile latching portion 170 is disposed at each central portion of the left and right ends of the height adjustment guide block 141. However, it is not limited thereto. Of course, a plurality of the tactile latching portions 170 may also be configured corresponding to the design value of the initial driving force, so that two or more tactile rollers 172 are simultaneously latched in two or more card slots 117a.

[0123] Here, an increase in the number of the tactile latching portions 170 results in an increase in the number of elastic blocks 171 that elastically support the tactile rollers 172. An increase in the number of the elastic blocks 171 means that the design value of the initial driving force applied by the user is correspondingly increased. Therefore, it can affect the set value of the stopping friction force of the friction force generating portion 160 described later, which is designed to generate a reaction to the initial driving force.

[0124] More specifically, as Figure 12b shown, the headrest height adjustment device 140 according to an embodiment of the present invention may further include a friction force generating portion 160. The friction force generating portion 160 is coupled to the front surfaces of a pair of guide protrusion ends 141a and 141b corresponding to the two ends of the height adjustment guide block 141, and the front surface contacts the back surface of the headrest main body 111 corresponding to the mounting portion 112.

[0125] Here, the friction force generating portion 160 is formed to have a substantially "匚"-shaped cross section and is made of a flexible material. The flexible material refers to a material that undergoes a certain degree of shape deformation when a predetermined external force is applied.

[0126] On the other hand, the friction force generating portion 160 may be made of a friction material that forms a predetermined friction force on the back surface of the headrest main body 111 (referring to the back surface forming the mounting portion 112) that is in direct contact.

[0127] The friction force generating portion 160 as described above is insertably coupled to the insertion protrusion ends 149 formed on the front surfaces of the two ends of the height adjustment guide block 141.

[0128] In addition, it is preferred that the front end of the friction force generating portion 160 is formed so that at least the front end protrudes forward when the height adjustment guide block 141 is inserted and installed inside the mounting portion 112, so as to have a predetermined friction force or more against the back surface of the headrest body 111. Here, the forward protrusion amount of the friction force generating portion 160 is preferably designed to generate the predetermined friction force at the front of a pair of guide protrusion ends 141a and 141b corresponding to the two ends of the height adjustment guide block 141.

[0129] The friction force generated between the friction force generating unit 160 and the headrest body 111 is a stop friction force, which may be a force that continuously acts on the headrest body 111 as a predetermined reaction force when the headrest body 111 moves in the vertical direction due to the initial actuation force provided by the user through the headrest body 111 .

[0130] Therefore, when the user provides the initial actuation force and the tactile roller 172 of the tactile buckle portion 170 passes over the slot 117a of the support component 117, the friction force generating portion 160 generates a predetermined reaction force. Accordingly, when a larger initial actuation force is set due to the elastic force of the elastic block 171, the user can stop the headrest body 111 at a desired height without trial and error.

[0131] In addition, the friction force generating unit 160 serves to eliminate the front-to-rear spacing distance of the height adjustment guide block 141 between the support component 117 and the front of the mounting portion 112, thereby cutting off the front-to-rear movement (swaying) of the height adjustment guide block 141 in advance, thereby preventing the generation of high-frequency noise.

[0132] On the other hand, a chair (not shown) according to an embodiment of the present invention may include the headrest height adjustment device 140 according to an embodiment of the present invention constructed as described above.

[0133] Here, the frame disposed at the upper end of the backrest portion (not shown) is described as being combined with the angle adjustment rotating block 144, and the angle adjustment rotating block 144 is rotatably connected to the height adjustment guide block 141. At the same time, the headrest height adjustment device 140 is described as being designed so that when the angle adjustment rotating block 144 is hingedly combined with the height adjustment guide block 141, there is no separate assembly tool such as a wrench, and the user can also easily assemble, thereby improving the convenience of assembly.

[0134] The headrest height adjustment device and the chair including the same according to one embodiment of the present invention are described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not necessarily limited to the above-mentioned one embodiment, but can certainly be implemented in various variations and equivalent scopes by a technician with ordinary knowledge in the technical field to which the present invention belongs. Therefore, the true scope of the rights of the present invention should be defined by the claims.

[0135] Industrial Applicability

[0136] The present invention provides a headrest height adjustment device and a chair comprising the same. When adjusting the height of the headrest, the height can be adjusted at a position desired by the user without trial and error, and moreover, the generation of operating noise can be prevented.

Claims

1. A headrest height adjustment device, comprising: A mounting portion is formed on the back side of the headrest body so as to be recessed forward; A support member is disposed at the left and right ends of the mounting portion; a height adjustment guide block inserted between the back surface of the headrest body corresponding to the mounting portion and the support member; and The friction force generating portion is coupled to the front of a pair of guide protrusion ends corresponding to the left and right end portions of the height adjustment guide block, and contacts the back of the headrest body corresponding to the mounting portion, to generate a friction force corresponding to the reaction force of the initial actuation force provided by the user.

2. The headrest height adjustment device according to claim 1, characterized in that: A plurality of slots are formed in the front of the support component, and are continuously recessed toward the rear in the up-down direction; A tactile buckle portion is provided on the back side of the height adjustment guide block, and the tactile buckle portion is elastically supported by the plurality of clamping grooves and is clamped.

3. The headrest height adjustment device according to claim 1, characterized in that: The friction force generating part is made of a flexible material.

4. The headrest height adjustment device according to claim 1, characterized in that: The friction force generating portion is formed of a friction material so as to generate a predetermined friction force between the friction force generating portion and a back surface of the headrest body corresponding to the mounting portion.

5. The headrest height adjustment device according to claim 1, characterized in that: The friction force generating portion has a front end that protrudes from the front surface of the height adjustment guide block to generate the friction force on the back surface of the headrest main body corresponding to the mounting portion.

6. The headrest height adjustment device according to claim 2, characterized in that: The tactile buckle portion comprises: an elastic block inserted into and disposed in a supporting groove formed on the back side of the height adjustment guide block; and A tactile roller is elastically supported by a predetermined elastic force through the elastic block, and a portion of the outer peripheral surface protrudes outward from the support groove to contact the card slot of the support component; The friction force of the friction force generating unit is set in consideration of the elastic force provided by the elastic block.

7. The headrest height adjustment device according to claim 1, characterized in that: Also includes: The rear cover is coupled to the rear portion of the headrest body and is formed with a through portion so that the space corresponding to the mounting portion is communicated to the rear.

8. The headrest height adjustment device according to claim 7, characterized in that: The left and right inner ends of the through portion are arranged to have a spacing distance that allows the support member to be concealed from the outside.

9. The headrest height adjustment device according to claim 1, characterized in that: The spacing distance between the upper end of the mounting portion and the upper end of the supporting member is greater than the upper and lower lengths of a pair of guide protrusion ends of the height adjustment guide block.

10. The headrest height adjustment device according to claim 1, characterized in that: Also includes: The guide plate is combined with the back side of the headrest body corresponding to the mounting portion to guide the up-and-down movement of the height adjustment guide block.

11. The headrest height adjustment device according to claim 10, characterized in that: The length between the left and right ends of the guide plate is configured to correspond to the spacing distance between the pair of guide protrusion ends.

12. A chair comprising the headrest height adjustment device according to any one of claims 1 to 11.

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