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1. (WO2018044009) FOLDING DEVICE OF HEADREST
Document

Description

Title of Invention

Technical Field

1  

Background Art

2   3   4   5   6   7  

Disclosure of Invention

Technical Problem

8  

Solution to Problem

9   10   11   12   13   14  

Advantageous Effects of Invention

15   16   17   18   19   20   21  

Brief Description of Drawings

22   23   24   25   26   27   28   29   30   31   32   33   34  

Mode for the Invention

35   36   37   38   39   40   41   42   43   44   45   46   47   48   49   50   51   52   53   54   55   56   57   58   59   60   61   62   63   64   65   66   67   68   69   70   71   72   73   74   75   76   77   78   79   80   81   82   83   84   85   86   87   88   89   90   91   92   93   94   95   96   97   98   99   100   101   102   103   104   105   106   107   108   109   110   111   112   113   114   115   116   117   118   119   120   121   122   123   124   125   126   127   128   129   130   131   132   133   134   135   136   137   138   139   140   141   142   143   144   145   146   147   148   149   150   151   152   153   154   155   156   157   158   159   160   161   162   163   164   165   166   167   168   169   170   171   172   173   174   175   176   177   178   179  

Claims

1   2   3   4   5   6  

Drawings

1   2   3   4   5   6   7   8   9   10   11   12   13  

Description

Title of Invention : FOLDING DEVICE OF HEADREST

Technical Field

[1]
The present invention relates to a folding device of headrest, more particularly, relates to a folding device of headrest wherein the center of rotation of a second locking unit, which is locked to or unlocked from a first locking unit, and the location where the stay is connected to the second locking unit are spaced apart from each other.

Background Art

[2]
The up-down height and the front-to-rear position of a headrest can be adjusted, however, since it cannot be laid down completely, there has been problems that when it is not used, especially the support member in the backseat, even without a passenger during driving, is still erected therefore not only the rear view of the driver or the front seat passenger is obstructed but also the safety of driving is hindered.
[3]
Considering such problems, in the past, a headrest device, US Patent No. 6,302,485, capable of maximally securing the passenger's rear field of view by laying down the headrests of the empty seats was invented. The headrest device 4 includes a head support member 1 supported on an inner frame 3 of the seat back 2 of the vehicle seat by a stay rod 5, wherein the support member is rotatably installed in a way that the rotating center is on the axis of the horizontal portion 6 of the stay rod 5, so that it is in the upright position when it is used, and in a laid down position (i.e., long thin lines with double dots) when it is not used.
[4]
However, such a folding device of the prior art has a problem in that the length of the cut-out portion formed in the head support member 1 becomes longer because the head support member 1 is rotated centered around the horizontal portion 6 of the stay rod 5.
[5]
[Leading Technical Literatures]
[6]
[Patent Literature]
[7]
[Patent Literature 1] Korea Patent No. 10-0982796

Disclosure of Invention

Technical Problem

[8]
An objective of the present invention devised for solving the above mentioned problems is to provide a folding device of a headrest capable of simplifying the structure and reducing the number of components, and at the same time, capable of minimizing the cut-out portions in the headrest or in the seat, and at the same time, capable of being applied to various shapes of stays in common.

Solution to Problem

[9]
To achieve the above described objective, a folding device of a headrest of the present invention is characterized in that and comprises: a bracket; a first locking unit connected to the bracket; a second locking unit rotatable with respect to the bracket, being locked to or unlocked from the first locking unit; and a stay connected to the second locking unit, wherein a headrest is connected to any one of the bracket and the stay, and a seat is connected to the remaining one, and the center of rotation of the second locking unit and the location where the stay is connected to the second locking unit are spaced apart from each other.
[10]
The first locking unit is provided with a first ratchet; the first locking unit is rotatable with respect to the bracket; and the second locking unit may be provided with a second ratchet.
[11]
When the headrest is unfolded, the stay is disposed in the front side or in the rear side of the second locking unit, and the center of rotation of the second locking unit and the location where the stay is connected to the second locking unit can be spaced apart from each other along the front-to-rear direction.
[12]
The second locking unit is rotatably installed in the bracket by a second locking unit shaft; the second locking unit comprises a first locking plate, and a second locking plate and a third locking plate formed by bending at the both sides of the first locking plate; a horizontal rod of the stay is installed in the first locking plate; the second locking unit shaft is installed in the second locking plate and the third locking plate; the second ratchet is formed in at least either one of the second locking plate or the third locking plate; a return spring is installed in the second locking member shaft; and the return spring can rotate the second locking unit with respect to the bracket when the locking of the first locking unit and the second locking unit is released.
[13]
The bracket comprises: a first bracket plate; a second bracket plate and a third bracket plate formed by bending at the both sides of the first bracket plate, wherein the first locking plate and the first bracket plate may be disposed facing to each other.
[14]
Stopper protrusions are formed in the second locking plate and the third locking plate, wherein the stopper protrusions can be stopped by the bracket when the second locking unit is locked to the first locking unit.

Advantageous Effects of Invention

[15]
According to a folding device of a headrest as described above, there are effects as follows.
[16]
The center of rotation of a second locking unit, which is locked to or unlocked from a first locking unit, and the location where a stay is connected to a second locking unit are spaced apart from each other, so that the structure can be simplified and the number of components can be reduced, and at the same time, the cut-out portions in the headrest or a the seat can be minimized, and at the same time, it can be applied to various shapes of stays in common by providing the second locking unit, where the first locking unit is stopped by, separately from the stay. Besides, since the stay can be installed in the outer side of the second locking unit, the folding device of the headrest of the present invention can be easily applied to the existing stays of various shapes. Furthermore, since installation of a bracket or a return spring becomes unnecessary, the process of bonding between a horizontal rod and a vertical rod through welding and the like becomes unnecessary after assembling each of the components to the horizontal rod of the stay, so that the manufacturing process becomes simplified.
[17]
The first locking unit is provided with a first ratchet wherein the first locking unit is rotatable with respect to the bracket, and the second locking unit is provided with a second ratchet so that the volume occupied by the locking device can be minimized, and the locking state is maintained more stably.
[18]
When the headrest is unfolded, a horizontal rod of the stay is disposed in the front side or in the rear side of the second locking unit and the bracket, and the center of rotation of the second locking unit and the location where the stay is connected to the second locking unit are spaced apart from each other along the front-to-rear direction, so that the volume of the device can be minimized and the cut-out portions can be further minimized.
[19]
The second locking unit is rotatably installed in the bracket by a second locking unit shaft; the second locking unit comprises a first locking plate, and a horizontal rod of the stay is installed in the first locking plate; the second locking unit shaft is installed in the second locking plate and the third locking plate; the second ratchet is formed in at least either one of the second locking plate or the third locking plate; a return spring is installed in the second locking member shaft; and the return spring rotates the second locking unit with respect to the bracket when the locking of the first locking unit and the second locking unit is released, so that the modularization of the device can be achieved more effectively, and the stay is installed in the plate member disposed along the left-to-right direction so as to be stably installed in the second locking member, thereby enhancing the strength of the device.
[20]
The bracket comprises: a first bracket plate; a second bracket plate and a third bracket plate formed by bending at the both sides of the first bracket plate, wherein the first locking plate and the first bracket plate are disposed facing to each other so that the number of components is reduced and the manufacturing process becomes further simplified, and thus, the cost can be reduced effectively and the device becomes compact.
[21]
Stopper protrusions are formed in the second locking plate and the third locking plate, wherein the stopper protrusions are stopped by the bracket when the second locking unit is locked to the first locking unit so that it is prevented that the force is concentrated only on the first and the second ratchets when unfolding, and since the headrest supported at the both sides by the stopper protrusions it can be stably supported. In addition, when the headrest is being moved to the unfolded position, if the headrest arrives to the unfolded position, it will not be rotated no more due to the stopper protrusions so that a user will not move the headrest excessively.

Brief Description of Drawings

[22]
Fig. 1 is a side view schematically illustrating an exemplary embodiment of a vehicle headrest of the prior art.
[23]
Fig. 2 is a perspective view of a folding device of a headrest according to the first exemplary embodiment of the present invention.
[24]
Fig. 3 is an exploded perspective view of a folding device of a headrest according to the first exemplary embodiment of the present invention.
[25]
Fig. 4 is a perspective rear view of a folding device of a headrest according to the first exemplary embodiment of the present invention.
[26]
Fig. 5 is side views illustrating the cut-out lengths of a folding device of a headrest according to the first exemplary embodiment of the present invention and a headrest folding device of the prior art.
[27]
Fig. 6 is a perspective view of a folding device of a headrest according to the first exemplary embodiment of the present invention when viewing from the left side (bracket is omitted).
[28]
Fig. 7 is a cross-sectional view illustrating the unfolded state of a folding device of a headrest according to the first exemplary embodiment of the present invention.
[29]
Fig. 8 is a cross-sectional view illustrating the folded state of a folding device of a headrest according to the first exemplary embodiment of the present invention.
[30]
Fig. 9 is a partial exploded perspective view of a folding device of a headrest according to the second exemplary embodiment of the present invention.
[31]
Fig. 10 is a perspective rear view of a folding device of a headrest according to the second exemplary embodiment of the present invention.
[32]
Fig. 11 is a rear view of a folding device of a headrest according to the second exemplary embodiment of the present invention.
[33]
Fig. 12 is a side view illustrating the installed state of a folding device of a headrest according to the third exemplary embodiment of the present invention.
[34]
Fig. 13 is a side view illustrating the installed state of a folding device of a headrest according to the fourth exemplary embodiment of the present invention.

Mode for the Invention

[35]
Hereinafter, a preferred exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings as follows.
[36]
For reference, for the components of the present invention which will be described hereinafter and identical to those of the prior art, separate detailed descriptions will be omitted, but instead will be referred to the prior art described above.
[37]
When any part is referred to be on the "top" of the other part, the any part may be directly on the other part or may be associated with different part therebetween. In contrast, if it is mentioned that a certain part is "right or directly above" of the other part, no other part is involved in the interim thereof.
[38]
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
[39]
"Down (or lower)", "up (or upper)" and the like are the terms representing relative spaces, and such terms may be used to describe the relationship of any part with respect to the other part illustrated in the drawing easier. These terms are intended to include other meanings or operations of the device that is used with the meaning intended in the drawing. For example, if a device in the drawing is flipped, any part that has been described to be in the "lower" side of the other part is now described to be in the "upper" side of the other part. And thus, the exemplary term "down (or lower)" includes all of the upper and lower directions. Device may be rotated 90° or rotated at a different angle, therefore the terms representing relative spaces are interpreted accordingly.
[40]
The term "connection (or connected or connecting)" includes all direct and indirect connections between the connected components.
[41]
<Embodiment 1>
[42]
As illustrated in Figs. 2 to 8, a folding device of a headrest of the first exemplary embodiment of the present invention is characterized in that and comprises: a bracket 110; a first locking unit 120 connected to the bracket 110; a second locking unit 130 rotatable with respect to the bracket 110, being locked to or unlocked from the first locking unit 120; and a stay 10 connected to the second locking unit 130, wherein a headrest h is connected to any one of the bracket 110 and the stay 10, and a seat s is connected to the remaining one, and the center of rotation of the second locking unit 130 and the location where the stay 10 is connected to the second locking unit 130 are spaced apart from each other.
[43]
The headrest h is connected to any one of the bracket 110 and the stay 10, and a seat s is connected to the remaining one.
[44]
The stay 10 comprises a horizontal rod 11 disposed along the left-to-right direction, and a vertical rod 12 disposed at the both ends of the horizontal rod 11 along the up-down direction. In the present exemplary embodiment, the horizontal rod 11 and the vertical rod 12 are integrally formed.
[45]
In the present exemplary embodiment, the seat s is connected to the bracket 110.
[46]
The bracket 110 is movably installed in the frame (not shown) disposed inside the upper side of the seat s.
[47]
The bracket 110 comprises a first bracket plate 111, and a second bracket plate 112 and a third bracket plate 113 that are formed by being rearwardly bended from the both sides of the first bracket plate 111.
[48]
The bracket plate 111 is formed in the shape of a rectangular shape relatively long in length along the up-down direction.
[49]
Mounting portions 115 that are outwardly protruded (towards left or right) are formed at the rear ends of the second bracket plate 112 and the third bracket plate 113. The mounting portions 115 are formed by outwardly bending the portions of the rear ends of the second bracket plate 112 and the third bracket plate 113.
[50]
Mounting holes wherein mounting members such as bolts can be coupled are formed in the mounting portions 115. The bracket 110 can be easily installed in the frame of the seat s through such mounting portions 115. The first bracket plate 111, the second bracket plate 112, the third bracket plate 113, and the mounting portions 115 are integrally formed therefore the number of components is reduced so that the manufacturing process becomes more simplified and the cost can be effectively reduced thereby.
[51]
The first locking unit 120 is connected to the bracket 110.
[52]
The first locking unit 120 is rotatably installed inside the bracket 110 by a first locking unit shaft 125 whose both sides are installed in the second bracket plate 112, the third bracket plate 113. And thus, the first locking unit 120 is rotatable with respect to the bracket 110.
[53]
The first locking unit 120 is formed in the shape of a plate and disposed along the front-to-rear direction.
[54]
A first through-hole wherein the first locking unit shaft 125 is inserted is formed in the first locking unit 120 along the left-to-right direction.
[55]
A head portion is formed in the end portion of the first locking unit shaft 125, and a mounting member is formed in the opposite side of the head portion. A receiving slot wherein the mounting member is received is formed in the outer side of the second bracket plate 112. The receiving slot is formed inwardly recessed from the outer side, and a protruded portion is formed in a surface of the second bracket plate 112, wherein the surface is facing the first locking unit 120. Due to such protruded portion, the friction between the second bracket plate 112 and the first locking unit 120 can be minimized.
[56]
In the opposite side of the head portion of the first locking unit shaft 125, a first step portion whose outer diameter is formed to be smaller than that of adjacent portion, a second step portion whose outer diameter is formed to be smaller than that of the first step portion, and a third step portion whose outer diameter is formed to be smaller than that of the second step portion are formed. The first locking unit 120 is inserted into the second step portion, and the second bracket plate 112 is inserted into the third step portion. Thus, the movement of the first locking unit 120 along the left-to-right direction is prevented.
[57]
In a shaft included in a folding device of a headrest of the present exemplary embodiment, a head portion and a step portion are formed similarly to the first locking unit shaft 125. In addition, when a rotating member and a surface are facing to each other, a protruded portion is formed to reduce friction of the rotating member or the facing surface.
[58]
A first ratchet 121 is outwardly and protrudedly formed in the outer circumferential surface of the first locking unit 120. The first ratchet 121 is formed in a way that the front-to-rear width is getting narrower as it travels towards the outer side.
[59]
A first bended portion 122 which is concave and continuous to the first ratchet 121 is formed in the outer circumferential surface of the first locking unit 120. The first bended portion 122 is formed in the shape of an arc.
[60]
In addition, a first unlocking stopping portion 126 continuous to the first ratchet 121 and outwardly protruded is formed in the outer circumferential surface of the first locking unit 120.
[61]
In addition, a spring stopping portion 123 wherein one end of a first locking unit spring 124 is stopped is formed in the outer circumferential surface of the first locking unit 120 in the shape of a slot. The first locking unit spring 124 returns the first locking unit 120 to its original position. In the present exemplary embodiment, the locking unit spring 124 returns the first locking unit 120 to the locking position. The locking unit spring 124 is provided as a coil spring. The locking unit spring 124 is inserted into the first step portion of the first locking unit shaft 125. Thus, the locking unit spring 124 is disposed at the right side of the first locking unit 120. The other end of the locking unit spring 124 is stopped by a second locking unit spring stopping portion 114 formed in the second bracket plate 112. The second locking unit spring stopping portion 114 is formed by cutting out a portion of the second bracket plate 112 and bending it so as to be inwardly protruded.
[62]
As such, the first bended portion 122, the first ratchet 121, the first unlocking stopping portion 126, and the spring stopping portion 123 are sequentially disposed along the counterclockwise direction when viewed from the right side.
[63]
The second locking unit 130 is rotatable with respect to the bracket 110, and is locked to or unlocked from the first locking unit 120.
[64]
The second locking unit 130 comprises a first locking plate 131, and a second locking plate 132 and a third locking plate 133 formed by forwardly bending at the both sides of the first locking plate 131. The first locking plate 131, the second locking plate 132 and the third locking plate 133 are integrally formed. Since the second locking unit 130 is formed in this way, the strength of the second locking unit 130 is enhanced.
[65]
The second locking unit 130 is disposed between the second bracket plate 112 and the third bracket plate 113 so that the first locking plate 131 and the first bracket plate 111 are facing to each other. Thus, the first bracket plate 111 is disposed in the front side of the device, and the first locking plate 131 is disposed in the rear side of the device. Due to this, the device becomes compact, and since the components of the device are disposed between the bracket 110 and the second locking unit 130, thereby protecting the device.
[66]
The second locking unit 130 is disposed further upper side than the first locking unit 120.
[67]
The second locking unit 130 is rotatably installed in the bracket 110 by a second locking unit shaft 160. That is, the center axis of the second locking unit shaft 160 becomes the center of rotation of the second locking unit 130.
[68]
A second through-hole wherein the second locking unit shaft 160 is inserted is formed along the left-to-right direction in the second locking plate 132 and the third locking plate 133. Thus, the second locking unit shaft 160 is installed in the second locking plate 132 and the third locking plate 133.
[69]
The both sides of the second locking unit shaft 160 are installed in the second bracket plate 112 and the third bracket plate 113. That is, the second locking unit shaft 160 is disposed so as to be penetrating through the third bracket plate 113, the third locking plate 133, the second locking plate 132, and the second bracket plate 112 along the left-to-right direction.
[70]
A head portion is formed in the end of the second locking unit shaft 160; a fixing member is formed in the opposite side of the head portion; and a receiving slot wherein the head portion and the fixing member are received in formed in the outer side of the second bracket plate 112 and the third bracket plate 113. The receiving slot is formed inwardly recessed from the outer side so that protruded portions are formed in the surfaces facing the first locking unit 120 in the second bracket plate 112 and the third bracket plate 113. The receiving slot is formed by being recessed towards the inner side from the outer side so that protruded portions are formed in the surface facing the second locking unit 130. Due to such protruded portions, the friction between the second locking unit 130 and the second bracket plate 112, and the friction between the second locking unit 130 and the third bracket plate 113 can be minimized.
[71]
In the opposite side of the head portion of the second locking unit shaft 160, a first step portion whose outer diameter is formed to be smaller than that of adjacent portion, and a second step portion whose outer diameter is formed to be smaller than that of the first step portion are formed. The second locking plate 132 of the second locking unit 130 is inserted into the first step portion, and the second bracket plate 112 is inserted into the second step portion. Thus, the movement of the second locking unit 130 along the left-to-right direction is prevented.
[72]
In at least one of the outer circumferential surfaces of the second locking plate 132 and the third locking plate 133 of the second locking unit 130, a second ratchet 134 which is to be geared with the first ratchet 121 is formed. In the present exemplary embodiment, the second ratchet 134 is formed only in the second locking plate 132. Due to this, the structure of the device can be further simplified.
[73]
The second ratchet 134 is formed in the shape of a slot wherein the first ratchet 121 is inserted.
[74]
When first ratchet 121 and the second ratchet 134 are geared with each other, it becomes a locked state so that the unfolded state is maintained, but when the gearing is disengaged, it becomes an unlocked state, that is, a folded state.
[75]
In the outer circumferential surface of the second locking plate 132, a second bended portion 136 continuously convex to the second ratchet 134 is formed. The second bended portion 136 is formed in the shape of an arc. The second bended portion 136 is contacted to the first bended portion 122 when folding.
[76]
In the outer circumferential surface of the second locking plate 132, a stopper protrusion 137 is outwardly and protrudedly formed continuous to the second bended portion 136. A stopper protrusion 137 is also formed in the third locking plate 133. The stopper protrusion 137 is inserted into a first cut-out portion 111a and a second cut-out portion 111b and stopped by the bracket 110 when the first ratchet 121 and the second ratchet 134 are gearing with each other (unfolded state). Thus, when the headrest h is moved from the folded state to the unfolded state, the headrest h is prevented from rotating further towards the rear side when it is arrived at the unfolded position, thereby preventing the device from being damaged. In addition, when the headrest h is in the unfolded state, the force supporting the head of a passenger is distributed over the first ratchet 121 and the second ratchet 134, the stopper protrusion 137 of the second locking plate 132 and the stopper protrusion 137 of the third locking plate 133, so that it can be stably supported, and at the same time, the durability is also enhanced.
[77]
The second ratchet 134, the second bended portion 136, and the stopper protrusion 137 are sequentially disposed towards the clockwise direction.
[78]
A return spring 150 is installed in the second locking unit shaft 160 so that the modularization can become more effectively, and the return spring 150 is provided as a coil spring.
[79]
The center portion (coil portion) of the return spring 150 is inserted into the second locking member shaft 160 and disposed between the second locking plate 132 and the third locking plate 133. The one end of the return spring 150 is stopped by a return spring stopping portion 135 protrudedly formed in the lower side of the first locking plate 131 of the second locking unit 130, and the other end is stopped by the first locking unit shaft 125.
[80]
The return spring 150 rotates the second locking unit 130 to the unfolded position with respect to the bracket 110 when the first locking unit 120 and the second locking unit 130 are unlocked.
[81]
A horizontal rod 11 of the stay 10 is installed in the rear side of the first locking plate 131 along the left-to-right direction. That is, the stay 10 is installed in the rear surface of the first locking plate 131. In this way, the stay 10 is directly installed in the second locking unit 130 and connected to the second locking unit 130.
[82]
In this way, the horizontal rod 11 of the stay 10 is installed at the outer side of the second locking plate 130. In addition, the horizontal rod 11 is installed in the surface, disposed along the left-to-right direction, of the second locking unit 130, thereby increasing the contact area, so that it can be stably installed.
[83]
The folding device of a headrest is densely installed in the center of the horizontal rod 11 of the stay 10.
[84]
The headrest h is installed in the upper side of the vertical rod 12 formed upwardly bended at the both ends of the horizontal rod 11 of the stay 10.
[85]
In addition, the center of rotation of the second locking unit 130 and the location where the stay 10 is connected to or installed in the second locking unit 130 are spaced apart from each other. That is, the center of rotation of the second locking unit 130 and the horizontal rod 11 of the stay 10 are not disposed on the same line of axis. The center of rotation of the second locking unit 130 and the center axis of the horizontal rod 11 are crossly disposed.
[86]
When the headrest h is in the unfolded state, the horizontal rod 11 of the stay 10 is disposed in the front side or the rear side of the second locking unit 130. In addition, the locations, where the center of rotation of the second locking unit 130 and the stay 10 are connected to the second locking unit 130, are spaced apart along the front-to-rear direction, so that the size of the device can be minimized and the cut-out portions can be further minimized.
[87]
In the present exemplary embodiment, since the headrest h is rotated towards the front side of the seat s, the horizontal rod 11 is disposed in the rear side of the second locking unit 130. In addition, the location where the stay 10 is connected to the second locking unit 130 is rearwardly disposed spaced apart from the center of rotation of the second locking unit 130.
[88]
In Fig. 5, the cut-out lengths c and c' formed in the seat s for the case when the center of rotation of the second locking unit and the location where the stay is connected to the second locking unit are same (a), and spaced apart from each other (b). As illustrated in Fig. 5, the cut-out length (39.9mm) of the case when the center of rotation of the second locking unit 130 and the location where the stay 10 is connected to the second locking unit 130 are spaced apart from each other is shorter than that (45mm) of the case when the second locking unit is rotating centered around the horizontal rod of the stay.
[89]
An unlocking unit 140 that unlocks the locking of the first locking unit 120 and the second locking unit 130 is installed in the bracket 110.
[90]
The unlocking unit 140 is rotatably installed in the rear surface of the first bracket plate 111 through an unlocking unit shaft 143.
[91]
As illustrated in Fig. 6, the unlocking unit 140 is formed in the shape of a plate and disposed along the left-to-right direction.
[92]
The unlocking unit shaft 143 is disposed along the front-to-rear direction.
[93]
The unlocking unit 140 is disposed in front side of the first locking unit 120 and the first locking unit shaft 125.
[94]
The unlocking unit 140 is formed in a way that a second unlocking stopping portion 142 is protruded towards the left at the left side thereof. The second unlocking stopping portion 142 is stopped by the first unlocking stopping portion 126 of the first locking unit 120. The second unlocking stopping portion 142 is disposed at the left side of the unlocking unit shaft 143.
[95]
The second unlocking stopping portion 142 and the first unlocking stopping portion 126 are disposed so as to be exposed through the second cut-out portion 111b.
[96]
In addition, a wire installation part 141 is formed at the left side of the unlocking unit 140. The wire installation part 141 is disposed further lower side than the second unlocking stopping portion 142 and the unlocking unit shaft 143.
[97]
The wire installation part 141 is formed by rearwardly bending the left lower end of the unlocking unit 140.
[98]
An insertion hole wherein the end of a wire 145 is inserted is formed in the wire installation part 141.
[99]
The unlocking unit 140 is provided with an unlocking unit spring 144 so as to be returned to the original position when the external force is removed. The unlocking unit spring 144 is provided as a coil spring. The center portion (coil portion) of the unlocking unit spring 144 is inserted into the unlocking unit shaft 143 and disposed in the rear side of the unlocking unit 140. The one end of the unlocking unit spring 144 is stopped by the unlocking unit 140 and the other end is stopped by the third bracket plate 113 of the bracket 110. In the unlocking unit 140, a first insertion hole wherein the one end of the unlocking unit spring 144 is inserted is formed so as to be disposed between the second unlocking unit stopping portion 142 and the wire installation part 141. In the third bracket plate 113, a second insertion hole wherein the other end of the unlocking unit spring 144 is inserted is penetratingly formed along the left-to-right direction.
[100]
Further, in the first bracket plate 111, a third cut-out portion 111c is penetratingly formed along the front-to-rear direction in a way that the one end of the unlocking unit spring 144 and the bracket 110 are not interfered with each other.
[101]
In addition, in the front surface of the unlocking unit 140, a protruded portion forwardly protruded is formed in the circumference of the third through-hole wherein the unlocking unit shaft 143 is inserted. Due to such protruded portion, the friction between the unlocking unit 140 and the bracket 110 is minimized.
[102]
Further, a wire case installation portion 116 being disposed horizontally is formed in the lower side of the bracket 110. The wire case installation portion 116 is disposed spaced apart from the wire installation part 141 towards the lower side. The wire case installation portion 116 is formed by rearwardly bending the lower end of the first bracket plate 111. In the wire case installation portion 116, a case insertion hole wherein the end of the wire case surrounding the wire 145 is installed is formed. Since the wire case installation portion 116 is provided in this way, the twisting of the wire 145 is prevented and the components disposed inside the bracket 110 can be protected.
[103]
Hereinafter, the operation of the present exemplary embodiment having the above described configuration will be described.
[104]
<Unfolded state>
[105]
As illustrated in Fig. 7, since the first ratchet 121 is geared with the second ratchet 134, the state wherein the headrest h is erected on the seat s is maintained.
[106]
<Folded state>
[107]
When the wire 145 is being pulled by a user, a sensor, or folding of the seat s, the unlocking unit 140 is rotated counterclockwise when the device is viewed from the front. As the unlocking unit 140 is rotated, the second unlocking stopping portion 142 is also rotated counterclockwise. Since the first unlocking stopping portion 126 of the first locking unit 120 is stopped by the second unlocking stopping portion 142, the first locking unit 120 is rotated counterclockwise when the device is viewed from the right side. Due to this, the first ratchet 121 is separated from the second ratchet 134 therefore the locking is released. The second locking unit 130, the stay 10 and the headrest h are rotated centered around the second locking unit shaft 160 due to the elastic force of the return spring 150, thereby being folded towards the front side. As illustrated in Fig. 8, the upper surface of the second locking unit 130 is stopped by the rear surface of the first bracket plate 111, and thus folding is completed thereby. Once the folding is completed, the second bended portion 136 and the first bended portion 122 are contacted to each other. The location where the second bended portion 136 and the first bended portion 122 are contacted to is disposed further front side than the center of rotation of the first locking unit 120.
[108]
The unfolding process of the folded headrest h in this way will be described as follows.
[109]
When the headrest h is lifted and pushed towards the rear side, the second locking unit 130, the stay 10 and the headrest h are rotated clockwise. Also, the first locking unit 120 is rotated clockwise due to the elastic force of the first locking unit spring 124. Due to this, the first ratchet 121 is geared with the second ratchet 134, and thus the unfolded state of the headrest h is maintained thereby. In addition, when the first ratchet 121 is geared with the second ratchet 134, the stopper protrusion 137 of the second locking unit 130 is stopped by the bracket 110, therefore the headrest h is stopped even a user pushes the headrest h further.
[110]
<Embodiment 2>
[111]
In describing the folding device of a headrest according to the second exemplary embodiment of the present invention, same symbols will be used for the same or similar elements as those of the folding device of a headrest according to the first exemplary embodiment of the present invention, and the detailed description and illustration will be omitted.
[112]
As illustrated in Figs. 9 to 11, in a folding device of a headrest according to the second exemplary embodiment, the locking of a first locking unit 220 and a second locking unit 230 are released (unlocked) as an unlocking unit 240 is rotated through a button member 270.
[113]
The bracket 210 of the present exemplary embodiment is fixedly installed on the seat, and a horizontal rod 11 of a stay 10 is installed in the second locking unit 230. A headrest is installed in the upper side of a vertical rod 12 of the stay 10.
[114]
The button member 270 comprises a button unit 271 comprising a button 271a, and a delivering unit 272 that delivers the force pushing the button 271a to the unlocking unit 240.
[115]
The button unit 271 is installed in the seat.
[116]
The button unit 271 comprises a button 271a, a bezel 271b wherein the button 271a is slidingly inserted along the left-to-right direction, and a button spring 271c which returns the button 271a.
[117]
The button 271a is exposed through the side portion of the seat and the like. The button 271a and the bezel 271b are coupled through the hook formed in the button 271a, and an elongated hole is formed in the bezel 271b so that the hook can be slided.
[118]
The button spring 271c is disposed between the button 271a and the bezel 271b.
[119]
The button 271a and the delivering unit 272 are detachably provided. Unlike this the button 271a and the delivering unit 272 may be connectively provided.
[120]
The delivering unit 272 comprises a block unit 273 formed with rectangular recesses and a rod portion 274 formed in the shape of a straight line at one side of the block unit 273. The delivering unit 272 is disposed along the left-to-right direction.
[121]
The block unit 273 comprises an upper recess and a lower recess formed in the lower side of the upper recess, and thus, in overall, it is formed in the shape of a trapezoidal block with recesses. Due to such block 273 force can be smoothly delivered even there is a height difference between the height of the button 271a and the height of the unlocking unit 240.
[122]
In the one side of the rod portion 274, a flange 275 is formed, and in the other side thereof, (a pair of) rod stopping protrusions 276 are formed. The rod stopping protrusions 276 are formed in the upper side and the lower side of the rod portion 274 respectively.
[123]
In the second bracket plate of the bracket 210, a rod through-hole 212a wherein the rod portion 274 is penetrating through is formed along the left-to-right direction. The rod through-hole 212a is disposed in the lower side of the first locking unit 220. In the front side and/or the rear side of the rod through-hole 212a, a protrusion through-hole 212b is formed along the left-to-right direction so as to be communicating with the rod through-hole 212a. During assembling, the rod stopping protrusions 276 are inserted into the bracket 210 through the protrusion through-hole 212b. After the assembling is completed, the rod stopping protrusions 276 are disposed along the up-down direction due to the self weight of the delivering unit 272. Thus, after the assembling is completed the rod stopping protrusions 276 are disposed crossly with respect to the protrusion through-hole 212b, therefore the rod stopping protrusions 276 are prevented from slipping out through the protrusion through-hole 212b.
[124]
The flange 275 is disposed in the outside of the bracket 210, and the rod stopping protrusions 276 are disposed inside the bracket 210. Further, a delivering unit return spring (not shown), which returns the delivering unit 272 to its original position, may be further provided between the flange 275 and the second bracket plate.
[125]
The unlocking unit 240 is rotatably installed in the bracket 210 same as the first exemplary embodiment. In the left lower side of the unlocking unit 240, a pressing part 241 being contacted to the rod portion 274 and pressed by the rod portion 274 is formed by being bended rearwardly. The pressing part 241 is disposed along the front-to-rear direction.
[126]
The unlocking process of the present exemplary embodiment will be describes as follows.
[127]
When a user pushes the button 271a, the delivering unit 272 is moved by the button 271a along the left-to-right direction. Due to this, the rod portion 274 presses the pressing part 241. Thus, the unlocking unit 240 is rotated counterclockwise. The rotated unlocking unit 240 rotates the first locking unit 220 as same as the above described first exemplary embodiment, so that the locking of the first locking unit 220 and the second locking unit 230 is released thereby.
[128]
When the user removed the force pressing the button 271a, the button 271a and the delivering unit 272 are returned to their original positions.
[129]
<Embodiment 3>
[130]
In describing the folding device of a headrest according to the third exemplary embodiment of the present invention, same symbols will be used for the same or similar elements as those of the folding device of a headrest according to the first and the second exemplary embodiments of the present invention, and the detailed description and illustration will be omitted.
[131]
As illustrated in Fig. 12, in a folding device of a headrest according to the third exemplary embodiment, a bracket 310 is installed in a headrest h, and a seat s is installed in the lower side of a vertical rod 12' of a stay 10', and the locking of a first locking unit and a second locking unit 330 is released through an wire 345.
[132]
A horizontal rod 11' of the stay 10' is installed in the rear side further rearward than the second locking unit shaft of the second locking unit 330.
[133]
A first locking unit shaft 325 of the first locking unit of the present exemplary embodiment is disposed in the upper side further upward than the second locking unit shaft of the second locking unit 330.
[134]
In addition, a wire case installation part 316 wherein a wire case is installed is disposed in the upper side than the first locking unit.
[135]
Further, in the stay 10', a hole wherein the wire 345 is inserted to and withdrawn from is formed so that the wire 345 can be smoothly guided towards the seat s.
[136]
<Embodiment 4>
[137]
In describing the folding device of a headrest according to the fourth exemplary embodiment of the present invention, same symbols will be used for the same or similar elements as those of the folding device of a headrest according to the first, the second and the third exemplary embodiments of the present invention, and the detailed description and illustration will be omitted.
[138]
As illustrated in Fig. 13, in a folding device of a headrest according to the fourth exemplary embodiment, a bracket 410 is installed in a headrest h, and a seat s is installed in the lower side of a vertical rod 12' formed in the lower side of the both sides of a horizontal rod 11' of a stay 10', and the locking of a first locking unit and a second locking unit is released through a button member 470.
[139]
The arrangement of each of the components of the present exemplary embodiment is similar to the arrangement of each of the components of the previously described third exemplary embodiment.
[140]
A button member 470 may be installed so as to be exposed through the side portion of the headrest h.
[141]
As described above, although the present invention has been described with reference to the preferred exemplary embodiments, various changes and alterations of the present invention can be made by those skilled in the art without departing from the spirit and the scope of the present invention written in the claims described herein below.
[142]
[Description of Symbols]
[143]
[Description of numerals for major elements in drawings]
[144]
10: stay
[145]
11: horizontal rod
[146]
12: vertical rod
[147]
110: bracket
[148]
111: first bracket plate
[149]
111a: first cut-out portion
[150]
111b: second cut-out portion
[151]
111c: third cut-out portion
[152]
112: second bracket plate
[153]
113: third bracket plate
[154]
114: second locking unit spring stopping part
[155]
115: mounting portion
[156]
116: wire case installation portion
[157]
120: first locking part
[158]
121: first ratchet
[159]
122: first bended portion
[160]
123: spring stopping portion
[161]
124: first locking unit spring
[162]
125: first locking unit shaft
[163]
126: first unlocking stopping portion
[164]
130: second locking unit
[165]
131: first locking plate
[166]
132: second locking plate
[167]
133: third locking plate
[168]
134: second ratchet
[169]
135: return spring stopping portion
[170]
136: second bended portion
[171]
137: stopper protrusion
[172]
140: unlocking unit
[173]
141: wire installation part
[174]
142: second unlocking stopping portion
[175]
143: unlocking unit shaft
[176]
144: unlocking unit spring
[177]
145: wire
[178]
150: return spring
[179]
160: second locking unit shaft

Claims

[Claim 1]
A folding device of a headrest comprising: a bracket; a first locking unit connected to the bracket; a second locking unit rotatable with respect to the bracket, being locked to or unlocked from the first locking unit; and a stay connected to the second locking unit, wherein a headrest is connected to any one of the bracket and the stay, and a seat is connected to the remaining one, and the center of rotation of the second locking unit and the location where the stay is connected to the second locking unit are spaced apart from each other.
[Claim 2]
The folding device of a headrest according to claim 1, wherein the first locking unit is provided with a first ratchet; the first locking unit is rotatable with respect to the bracket; and the second locking unit is provided with a second ratchet.
[Claim 3]
The folding device of a headrest according to claim 1 or claim 2, wherein when the headrest is unfolded, the stay is disposed in the front side or in the rear side of the second locking unit, and the center of rotation of the second locking unit and the location where the stay is connected to the second locking unit are spaced apart from each other along the front-to-rear direction.
[Claim 4]
The folding device of a headrest according to claim 2, wherein: the second locking unit is rotatably installed in the bracket by a second locking unit shaft; the second locking unit comprises a first locking plate, and a second locking plate and a third locking plate formed by bending at the both sides of the first locking plate; a horizontal rod of the stay is installed in the first locking plate; the second locking unit shaft is installed in the second locking plate and the third locking plate; the second ratchet is formed in at least either one of the second locking plate or the third locking plate; a return spring is installed in the second locking member shaft; and the return spring rotates the second locking unit with respect to the bracket when the locking of the first locking unit and the second locking unit is released.
[Claim 5]
The folding device of a headrest according to claim 4, wherein the bracket comprises: a first bracket plate; a second bracket plate and a third bracket plate formed by bending at the both sides of the first bracket plate, wherein the first locking plate and the first bracket plate are disposed facing to each other.
[Claim 6]
The folding device of a headrest according to claim 4, wherein stopper protrusions are formed in the second locking plate and the third locking plate, wherein the stopper protrusions are stopped by the bracket when the second locking unit is locked to the first locking unit.

Drawings

[ Fig. 1]

[ Fig. 2]

[ Fig. 3]

[ Fig. 4]

[ Fig. 5]

[ Fig. 6]

[ Fig. 7]

[ Fig. 8]

[ Fig. 9]

[ Fig. 10]

[ Fig. 11]

[ Fig. 12]

[ Fig. 13]