KR101937411B1 - Folding apparatus for headrest - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headrest folding apparatus for folding a headrest in a seat direction, if necessary, so as to increase the utilization of the internal space of a vehicle. A rotary frame installed to be rotatable with respect to the fixed frame, the rotary frame being installed on the headrest side; A locking member installed in the fixed frame and having a locking groove formed in a part thereof; A locking protrusion is formed on the rotary frame so that the locking protrusion can be inserted into and locked to the locking groove by a wire around the first hinge axis so that the locking protrusion can be released from the locking groove and released from the locking. A ratchet member rotatably formed; And a pitch forming device installed between the wire and the ratchet member so as to form a clearance on the wire.

Description

[0001] The present invention relates to a folding apparatus for headrest,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a headrest folding apparatus, and more particularly, to a headrest folding apparatus capable of easily folding a headrest in a seat direction when necessary, thereby improving the internal space utilization of the vehicle.

Generally, the seat for a vehicle may include a seat cushion for supporting a hip portion of a passenger when seated, a seatback for supporting the passenger's back, and a headrest for supporting the neck and head of the passenger.

On the other hand, the car seat is basically equipped with various functions such as seat back angle adjustment function (recliner), seat cushion height adjustment function, seat front / rear position adjustment function (slide device), etc. to provide appropriate comfort according to seated passengers can do.

In addition, in the case of a vehicle having two or more rows of three or more rows, the basic functions of the above-described seat, an additional function that can variously change the position and shape of the seat for the convenience of passengers, May be further provided.

As one of these functions, there is a tip up function. The seat which can be tip-uped, for example, can fold the seat back and the seat cushion in a standing state with respect to the unused vehicle seat and fold the heft rest for this purpose, thereby enhancing the space utilization of the passengers entering and leaving the rear seat in the vehicle, And can be provided for the purpose of increasing utilization.

Generally, as described in Korean Patent No. 10-1404478, when the rotating cam is rotated by a wire in a locked state in which the fixed cam and the rotating cam are meshed with each other, the folding device of the conventional headrest is folded, .

On the other hand, the wire assembled to the headrest frame for folding the conventional headrest has a problem in that since the length thereof is not constant during the manufacture of the factory, it becomes too loose after assembly and the folding operation can not be performed even if pulled, There has been a problem in that the folding operation is not smoothly controlled such as folding operation by itself.

In order to solve the tension problem of the wire, conventionally, a multi-step circumferential groove portion is formed in a fastening portion for fixing the wire protection tube to the headrest frame, There have been attempts to select and assemble any of the grooves.

However, in spite of such conventional efforts, errors caused by operator's mistakes still occur in the selection process of the workers, and in addition, in the process of using for a long time after assembly, There is a tendency that the folding operation becomes too insensitive or sensitive again.

In addition, due to the characteristics of the running environment of the vehicle, many external forces, shocks, and vibrations are generated in the wire even when the vehicle is not operated, and the headrest is unexpectedly folded in a harsh environment to cause safety accidents.

Conventionally, when the folding or unfolding is performed, the load of the resilient spring or the load of the human body is concentrated on the fixed cam, that is, the locking member. Such a load is transmitted from the center of the fixed frame and headrest frame to one side There is a problem that a malfunction phenomenon may be caused by causing deformation toward the biased side, and the rigidity and durability are deteriorated thereby adversely affecting vehicle testing and certification.

Conventionally, the headrest frame is structurally unstable and can not be stopped at a predetermined forward rotation angle during a folding process. In the process of over folding or unfolding at an angle higher than the predetermined rotation angle, It is not stopped at a predetermined reverse rotation angle, and over unfolding at an angle higher than the predetermined angle has many problems such as adverse effect on vehicle test and certification.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, Error, etc., to prevent malfunction of the product, thereby greatly improving the safety, reliability and durability of the product. By using a single circumferential groove portion in the fastening portion, it is possible to simplify the assembly and reduce the assembly time, And the locking member is located at a central position of the fixed frame and the rotary frame, and the rigidity, durability, and operation precision of the product can be improved by arranging the components evenly to the left and right, Avoid folding or over unfolding to achieve superior results in vehicle certification or testing To provide a headrest folding device that allows an object. However, these problems are exemplary and do not limit the scope of the present invention.

According to an aspect of the present invention, there is provided a headrest folding apparatus comprising: a stationary frame that can be installed on a seat side; A rotary frame installed to be rotatable with respect to the fixed frame, the rotary frame being installed on the headrest side; A locking member installed in the fixed frame and having a locking groove formed in a part thereof; A locking protrusion is formed on the rotary frame so that the locking protrusion can be inserted into and locked to the locking groove by a wire around the first hinge axis so that the locking protrusion can be released from the locking groove and released from the locking. A ratchet member rotatably formed; And a pitch forming device installed between the wire and the ratchet member so as to form a clearance on the wire.

Further, according to the present invention, the clearance forming device may further include: a projecting pin formed on one side of the ratchet member; And a wire connecting portion formed on one side of the second hinge shaft to be rotatable about a second hinge axis formed on the ratchet member and having one side formed with a wire connection portion and a clearance groove portion formed on the other side to loosely couple the protrusion pin And a yoke member.

According to the present invention, the allowance groove portion of the yoke member contacts the upper portion of the protruded fin, the inner side portion contacts the lower portion of the protruding pin, And may be formed in a C-shape or a closed arc shape with one side opened to prevent further rotation.

According to the present invention, the clearance forming apparatus may further include: a first elastic spring having a restoring force in a direction in which the yoke member is normally rotated.

In addition, according to the present invention, the fixed frame includes a vertical frame and a horizontal frame connected to the vertical frame, wherein the rotary frame includes a front frame and a rear frame, Wherein the left and right plates are provided at a central position of the horizontal frame so as to maintain a balance of force, and the left and right plates of the rotating frame are in balance of force Each of which can be positioned at the same distance about the locking member.

According to the present invention, a center position retaining protrusion is formed in a lower portion of the locking member so as to pass through a guide hole formed in the lower plate of the revolving frame so as to prevent the locking member from deviating from the center position of the revolving frame .

Further, the headrest folding apparatus according to the present invention may further include: a second elastic spring having a restoring force in a direction in which the rotating frame is folded; And a third resilient spring for restoring the ratchet member in a direction to rotate in the direction of the locking member, wherein the third elastic spring urges the ratchet member in a direction toward the locking member, And the second elastic spring and the third elastic spring can be located on the opposite side.

In addition, according to the present invention, the rotating frame further includes a stopper pin formed in a shape transverse from the left plate to the right plate of the rotating frame, The first contact surface contacting the stopper pin and the second contact surface contacting the rear portion of the lower plate of the rotating frame are formed in order to prevent the first contact surface from being biased in both directions, A third contact surface contacting the ratchet member and a fourth contact surface contacting the front portion of the lower plate of the rotating frame may be formed.

In addition, according to the present invention, the wire is protected by a wire tube, and the wire tube may be formed with a fastening part having a single circumferential groove formed at one side thereof so as to be inserted and fixed in the concave groove formed in the rotating frame.

According to some embodiments of the present invention as described above, errors in assembling parts, errors in assembling, errors in deformation during use, and errors in external force / impact / vibration during running are all actively accepted, Thereby improving the safety, reliability and durability of the product. Also, it is possible to simplify the assembly and reduce the assembling time, improve the productivity of assembly, and increase the locking force of the locking member, It is located at the center position and can arrange the components evenly horizontally to improve the rigidity, durability and precision of the operation of the product, and prevent over folding or over unfolding phenomenon, Effect. Of course, the scope of the present invention is not limited by these effects.

1 is an external perspective view of a headrest folding apparatus according to some embodiments of the present invention.
Fig. 2 is an exploded perspective view of the headrest folding apparatus of Fig. 1; Fig.
Fig. 3 is an exploded perspective view of the headrest folding apparatus shown in Fig. 2; Fig.
4 is a front view of the headrest folding apparatus of FIG.
Fig. 5 is a side sectional view showing the headrest folding apparatus of Fig. 1;
Fig. 6 is a side sectional view showing the unlocked state of the headrest folding apparatus of Fig. 5;
7 is a side sectional view showing the folding state of the headrest folding apparatus of Fig.
8 is a side sectional view showing the unfolded state of the headrest folding apparatus of Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

It is to be understood that throughout the specification, when an element such as a film, region or substrate is referred to as being "on", "connected to", "laminated" or "coupled to" another element, It will be appreciated that elements may be directly "on", "connected", "laminated" or "coupled" to another element, or there may be other elements intervening therebetween. On the other hand, when one element is referred to as being "directly on", "directly connected", or "directly coupled" to another element, it is interpreted that there are no other components intervening therebetween do. Like numbers refer to like elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

Also, relative terms such as "top" or "above" and "under" or "below" can be used herein to describe the relationship of certain elements to other elements as illustrated in the Figures. Relative terms are intended to include different orientations of the device in addition to those depicted in the Figures. For example, in the figures the elements are turned over so that the elements depicted as being on the top surface of the other elements are oriented on the bottom surface of the other elements. Thus, the example "top" may include both "under" and "top" directions depending on the particular orientation of the figure. If the elements are oriented in different directions (rotated 90 degrees with respect to the other direction), the relative descriptions used herein can be interpreted accordingly.

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 "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically showing ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention should not be construed as limited to the particular shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

1 is an external perspective view of a headrest folding apparatus 100 according to some embodiments of the present invention. FIG. 2 is an exploded perspective view of the headrest folding apparatus 100 of FIG. 1, and FIG. 3 is an exploded perspective view of the headrest folding apparatus 100 of FIG. 2 in an enlarged manner.

1 to 3, a headrest folding apparatus 100 according to some embodiments of the present invention mainly includes a fixed frame 10, a rotating frame 20, a locking member 30 , A ratchet member 40 and a pitch forming device 60. [

For example, as shown in FIGS. 1 to 3, the fixed frame 10 is inserted into the upper end of the seat back so as to be adjustable in height at multiple stages, As shown in FIG.

More specifically, for example, as shown in Figs. 1 to 3, the fixed frame 10 includes two vertical frames 11 (see Fig. 1) installed on the left and right sides of the seatback in the vertical direction so as to be inserted into the seatback ) 11 and a transverse frame 12 formed in the transverse direction so as to connect the upper ends of the vertical frames 11, 11.

The horizontal frame 12 is not rotated by itself but inserted into a hinge hole formed in the rotary frame 20 to be described later so as to serve as a rotation axis or a rotation center when folding and unfolding the rotary frame 20. [ And may be formed into a circular pipe or a circular rod shape.

The fixed frame 10 may be fixedly supported on the rotary frame 20, the locking member 30, the ratchet member 40, the wire 50 and the clearance forming device 60 And is not necessarily limited to the drawings, and various structures of various pipes or rod shapes can be applied.

1 to 3, the rotary frame 20 is rotatably mounted on the stationary frame 10, and is a frame structure that can be installed on the headrest side. .

More specifically, for example, as shown in FIGS. 1 to 3, the rotary frame 20 is formed integrally with the rotary frame 20 so as to be rotatable about the horizontal frame 12 of the fixed frame 10 A left side plate 22, a right side plate 23 and a lower side plate 24. The upper plate 21, the left plate 22, the right plate 23,

The front and rear of the rotary frame 20 are opened so as not to interfere with the rotation of the locking member 30 and the ratchet member 40 provided inside, This is because it is possible to secure a work space in order to facilitate the repair and to facilitate the repair in case of failure.

Therefore, the headrest can be folded in the direction of the seat back by the fixed frame 10 and the rotating frame 20 capable of rotating based on the fixed frame 10.

1 to 3, the locking member 30 may be a kind of fixing body provided on the fixing frame 10 and having a locking groove F formed in a part thereof.

The ratchet member 40 corresponds to the ratchet member 40. The ratchet member 40 is formed in the rotary frame 20 and is formed with a locking protrusion T to be partially inserted into the locking groove F to be locked, T may be detached from the latching groove F so that the locking can be released by the wire 50 about the first hinge axis H1.

Therefore, when the ratchet member 40 is in the unfolded state, the latching protrusion T can be inserted into the latching groove F of the locking member 30 to maintain the latching state. When the ratchet member 40 is in the folding state, The hook 50 is pivoted and the latching protrusion T is released from the latching groove F to release the latching state.

1 to 3, the clearance forming device 60 is installed between the wire 50 and the ratchet member 40 so as to form a clearance on the wire 50. In addition, Which may be a kind of cushioning device.

3, the clearance forming device 60 includes a protruding pin 61 formed on one side of the ratchet member 40 and a protruding pin 61 formed on one side of the ratchet member 40 and a second hinge shaft 40 formed on the ratchet member 40. [ A wire connecting portion 63 connected to the wire 50 is formed at one side thereof and a wire connection portion 63 is formed at one side thereof to allow the protruding pin 61 to be loosely coupled to the other side, And a yoke member 62 on which a plurality of yoke members 64 are formed.

Fig. 4 is a front view of the headrest folding apparatus 100 of Fig. 1, and Fig. 5 is a side sectional view showing the headrest folding apparatus 100 of Fig.

More specifically, for example, as shown in Figs. 1 to 5, the allowance groove portion 64 of the yoke member 62 is positioned in the counterclockwise direction of the yoke member 62 The inner side portion of the yoke member 62 contacts the lower portion of the projecting pin 61 and is rotated counterclockwise by an allowance angle K during reverse rotation of the yoke member 62 Shaped portion or a closed circular arc shape in which one side is opened so that the portion is in contact with the upper portion of the projecting pin 61 and is no longer rotated.

1 to 5, the clearance forming device 60 may further include a first elastic spring 65 to which a restoring force is applied in a direction in which the yoke member 62 is rotated forward have.

That is, in general, the wire 50 is formed by twisting a plurality of strands of the unit wires, and the wire 50 is deformed such that the length is shortened due to frictional loss of the cable path or product dispersion (tolerance) And a phenomenon in which the ratchet member 40 is partially locked in the unstable state of the locking member 30 due to the deformation of the length of the wire 50 so that the locking is maintained, that is, the partial locking state is generated However, even if the assembler assembles only to the single circumferential groove portion 51a to be described later by buffering a part of the initial operating stroke with the above-mentioned clearance angle K so that such a leg forming device 60 can prevent such partial locking phenomenon Allowing normal operation, thereby allowing the assembler to select one of the several circumferential grooves and to assemble one circumferential groove It is possible to assemble easily and quickly to the groove portion, and the productivity can be greatly improved.

Therefore, it is possible to actively accept errors such as errors in assembling parts, errors in assembly, distortion errors during use, and external / impact / vibration errors during operation, thereby preventing malfunction of the products. Thus, safety, reliability and durability Can greatly improve.

4, the locking member 30 may be installed at a central position of the transverse frame 12 so as to maintain a balance of force, The left side plate 22 and the right side plate 23 can be positioned at the same distance around the locking member 30 so as to maintain a balance of force.

1 to 5, the locking member 30 is provided at a lower portion of the locking member 30 so as to prevent the locking member 30 from deviating from the center position of the rotation frame 20, A center position maintaining protrusion S passing through a guide hole G formed in the lower plate 24 of the base plate 20 may be formed.

1 to 5, a headrest folding apparatus 100 according to some embodiments of the present invention includes a first frame 2, a second frame 3, a second frame 4, Further comprising a third resilient spring (80) to which a resilient force is applied in a direction in which the resilient spring (70) and the ratchet member (40) are rotated in the direction of the locking member (30) The wire 50 and the clearance forming device 60 are located at one side with respect to the locking member 30 and the second elastic spring 70 and the third elastic spring 80 are positioned at the opposite side .

Therefore, by positioning the locking member 30 in which the load is concentrated at the center position of the horizontal frame 12 of the fixed frame 10 and positioning it at the center position of the rotary frame 20, The rigidity and durability of the product and the precision of operation can be improved.

1 to 5, the rotating frame 20 is formed in a shape that traverses from the left side plate 22 to the right side plate 23 of the rotating frame 20 And a stopper pin (P), wherein the locking member (30) has a first contact surface (F1) in contact with the stopper pin (P) so as to prevent an unfolding in the unfolding mode in both directions, A second contact surface F2 is formed at the rear side of the lower plate 24 of the rotary frame 20 so as to be in contact with the rear side of the lower plate 24, A contact surface F3 and a fourth contact surface F4 contacting the front portion of the lower plate 24 of the rotary frame 20 may be formed.

Therefore, it is possible to prevent over folding or over unfolding of the headrest caused by unreasonable force or external force, so that excellent results can be obtained in the certification or test of a vehicle that predicts a collision, rollover, or emergency of the vehicle.

1 to 5, the wire 50 is protected by a wire tube WT, and the wire tube WT is supported by a concave groove portion 20a (not shown) formed in the rotary frame 20, And a fastening part 51 having a single circumferential groove part 51a formed at one side thereof can be formed.

Therefore, if the single circumferential groove portion 51a is used in the fastening portion 51, the operator can assemble only one circumferential groove portion in any case, thereby simplifying the assembly, reducing the assembly time and improving the productivity of assembly.

Fig. 5 is a side sectional view showing a standby state (unfolded state) of the headrest folding apparatus 100 of Fig. 1, Fig. 6 is a side sectional view showing the unlocked state of the headrest folding apparatus 100 of Fig. FIG. 7 is a side sectional view showing the folding state of the headrest folding apparatus 100 of FIG. 6, and FIG. 8 is a side sectional view showing the unfolding state of the headrest folding apparatus 100 of FIG.

5 to 8, the operation of the headrest folding apparatus 100 according to some embodiments of the present invention will be described in more detail. First, as shown in FIG. 5, The latching protrusion T is inserted into the latching groove F of the locking member 30 so that the locking member 30 and the ratchet member 30 40 can be maintained as it is.

At this time, even if the yoke member 62 rotates within the clearance angle K, the tension of the wire 50 can be buffered not transmitted to the ratchet member 40 as it is.

Therefore, it is possible to actively accept errors such as errors in assembling parts, errors in assembly, distortion errors during use, and external / impact / vibration errors during operation, thereby preventing malfunction of the products. Thus, safety, reliability and durability Can greatly improve.

6, when the yoke member 62 is rotated over the clearance angle K, the tension of the wire 50 is transmitted to the ratchet member 40 so that the ratchet member 40 The rotation frame 20 can be folded by the restoring force of the second elastic spring 70 while the locking of the locking member 30 and the ratchet member 40 is released.

7, when the rotary frame 20 is rotated in the A direction to complete the folding, the locking member 30 contacts the third contact surface F3 with the ratchet member 40 And at the same time, the fourth contact surface F4 is in contact with the front portion of the lower plate 24 of the rotary frame 20 to prevent it from being overfolded in the folding mode in both directions.

8, when the user forcibly unfolds or rotationally unfolds the rotary frame 20 in the direction B, the engaging groove portion F of the locking member 30 is retracted The latching protrusion T can be inserted so that the locking state of the locking member 30 and the ratchet member 40 can be maintained.

At this time, the locking member 30 contacts the stopper pin P while the second contact surface F2 contacts the lower plate 24 of the rotary frame 20, So that it can be prevented in both directions from being over-folded in the unfolding mode.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Fixed frame
11: Vertical frame
12: Horizontal frame
20: Rotating frame
21: Top plate
22: Left side plate
23: Right side plate
24: Lower plate
30: Locking member
40: ratchet member
50: wire
51:
60:
61: projecting pin
62: yoke member
63:
64:
65: first elastic spring
70: Second elastic spring
80: third elastic spring
100: headrest folding device

Claims (9)

A stationary frame that can be installed on the seat side;
A rotary frame installed to be rotatable with respect to the fixed frame, the rotary frame being installed on the headrest side;
A locking member installed in the fixed frame and having a locking groove formed in a part thereof;
A locking protrusion is formed on the rotary frame so that the locking protrusion can be inserted into and locked to the locking groove by a wire around the first hinge axis so that the locking protrusion can be released from the locking groove and released from the locking. A ratchet member rotatably formed; And
A ratcheting member provided between the wire and the ratchet member so as to form a clearance on the wire;
Lt; / RTI >
Wherein the fixed frame includes a vertical frame and a horizontal frame connected to the vertical frame,
The rotating frame is composed of an upper plate, a left plate, a right plate, and a lower plate which are opened front and rear so as to be rotatable about the horizontal frame,
Wherein the locking member is provided at a central position of the horizontal frame so as to maintain a balance of force,
Wherein the left plate and the right plate of the rotating frame are located at the same distance about the locking member, respectively, so as to maintain a balance of force,
Wherein a center position holding protrusion is formed in a lower portion of the locking member so as to pass through a guide hole formed in the lower plate of the rotary frame so as to prevent the locking member from deviating from the center position of the rotary frame. The method according to claim 1,
Wherein the clearance forming device comprises:
A protruding pin formed on one side of the ratchet member; And
A yoke portion having a wire connecting portion formed at one side thereof and connected to the wire and formed with a clearance groove portion for loosely coupling the protruding pin to the other side, absence;
The headrest folding device comprising: 3. The method of claim 2,
Wherein the outer circumferential portion of the yoke member is in contact with an upper portion of the projecting pin and is rotated counterclockwise by an allowance angle in the reverse rotation so that the inner rudder portion comes into contact with the lower portion of the projecting pin, And is formed into an open C-shaped or closed circular arc shape. The method of claim 3,
Wherein the clearance forming device comprises:
A first elastic spring to which a restoring force acts in a direction in which the yoke member is rotated forward;
The headrest folding device further comprising: delete delete A stationary frame that can be installed on the seat side;
A rotary frame installed to be rotatable with respect to the fixed frame, the rotary frame being installed on the headrest side;
A locking member installed in the fixed frame and having a locking groove formed in a part thereof;
A locking protrusion is formed on the rotary frame so that the locking protrusion can be inserted into and locked to the locking groove by a wire around the first hinge axis so that the locking protrusion can be released from the locking groove and released from the locking. A ratchet member rotatably formed; And
A ratcheting member provided between the wire and the ratchet member so as to form a clearance on the wire;
Lt; / RTI >
Wherein the fixed frame includes a vertical frame and a horizontal frame connected to the vertical frame,
The rotating frame is composed of an upper plate, a left plate, a right plate, and a lower plate which are opened front and rear so as to be rotatable about the horizontal frame,
Wherein the locking member is provided at a central position of the horizontal frame so as to maintain a balance of force,
Wherein the left plate and the right plate of the rotating frame are located at the same distance about the locking member, respectively, so as to maintain a balance of force,
A second elastic spring to which a restoring force acts in a direction in which the rotating frame is folded; And
And a third resilient spring to which a restoring force is applied in a direction in which the ratchet member is rotated in the direction of the locking member,
In which the wire and the clearance forming device are positioned in one direction with respect to the locking member and the second elastic spring and the third elastic spring are located on the opposite side thereof for balance of force and space utilization, . A stationary frame that can be installed on the seat side;
A rotary frame installed to be rotatable with respect to the fixed frame, the rotary frame being installed on the headrest side;
A locking member installed in the fixed frame and having a locking groove formed in a part thereof;
A locking protrusion is formed on the rotary frame so that the locking protrusion can be inserted into and locked to the locking groove by a wire around the first hinge axis so that the locking protrusion can be released from the locking groove and released from the locking. A ratchet member rotatably formed; And
A ratcheting member provided between the wire and the ratchet member so as to form a clearance on the wire;
Lt; / RTI >
Wherein the fixed frame includes a vertical frame and a horizontal frame connected to the vertical frame,
The rotating frame is composed of an upper plate, a left plate, a right plate, and a lower plate which are opened front and rear so as to be rotatable about the horizontal frame,
Wherein the locking member is provided at a central position of the horizontal frame so as to maintain a balance of force,
Wherein the left plate and the right plate of the rotating frame are located at the same distance about the locking member, respectively, so as to maintain a balance of force,
The rotating frame includes:
And a stopper pin formed in a shape transverse from the left plate to the right plate of the rotating frame,
Wherein the locking member comprises:
A first contact surface that is in contact with the stopper pin and a second contact surface that is in contact with the rear portion of the lower plate of the rotating frame are formed so as to prevent the unfolding in the unfolding mode in both directions,
Wherein a third contact surface that is in contact with the ratchet member and a fourth contact surface that contacts the front portion of the lower plate of the rotating frame are formed to prevent bi-directional overfolding in the folding mode. The method according to claim 1,
The wire is protected by a wire tube,
Wherein the wire tube is formed with a fastening portion having a single circumferential groove formed on one side thereof so as to be inserted and fixed in the concave groove formed in the rotating frame.

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