JP2000217659A - Tilting device for head rest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a tilting device for head reset of a smaller number of parts, easily set at a tilted location by the urging force of an urging member such as a spring, and also, surely keep a head rest body at a standing location and a tilted location. SOLUTION: A fixed plate 1 on which a lock pin 30 is provided, is fixed to a stay, and at the same time, a tilting plate 2 having a cam hole 5 to guide the lock pin 30, is rotatably held by a stay 200, and a coil spring 4 which respectively urges the lock pin 30 and the tilting plate 2, is arranged. When the tilting plate 2 is slightly tilted forward from a standing location, the engagement of the lock pin 30 at the standing location is released, and the tilting plate 2 automatically tilts backward by the coil spring 4 without stopping at the standing location, and is held at the tilted location, and when the tilting plate 2 is lifted forward from the tilted location, the lock pin 30 is engaged again, and the tilting plate 2 is held at the standing location.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headrest which can be held in an upright position in which the headrest is substantially upright at the upper end portion of the seat back, and a fall position in which the headrest falls down so as to be substantially horizontal rearward or forward. It relates to a folding device.

[0002]

2. Description of the Related Art A seat of an automobile is provided with a headrest in order to stably hold an occupant's head rear side and to reduce fatigue as much as possible. The headrest includes a substantially U-shaped stay inserted into the seat back so as to be adjustable in height, a cushion body provided to cover the stay, and a skin covering the cushion body. In recent years, a headrest which is held by a seat back so as to be rotatable back and forth so that a front and rear position with respect to a seat can be adjusted is also known.

[0003] By the way, in the conventional headrests, many are provided only in the driver's seat and the passenger's seat. However, in order to improve the safety and comfort of the occupant in the rear seat,
It is stated that it is preferable to provide a headrest also on the rear seat. But if there is no occupant in the backseat,
It is preferred that there is no headrest to ensure sufficient rear visibility.

There is also known a passenger car in which a wide space can be secured by tilting the rear seat forward, but if the rear seat is provided with a headrest, it interferes with the front seat when tilted forward. Often. To deal with this, the headrest of the rear seat is removed and then tilted forward, but there is a problem that the work of attaching and detaching the headrest is troublesome.

[0005] In order to solve such a problem, there has been known a retractable headrest which can be held at an upright position on a seat back and at a fall position which is swung rearward or forward. For example, Japanese Patent Laying-Open No. 5-23935 discloses a headrest device in which a headrest is constituted by a pair of front and rear blocks, and a pair of blocks can be rotated by interposing a link mechanism therebetween. According to this headrest device, the standing / falling operation of the headrest can be performed only by pressing one of the blocks.

Japanese Patent Laid-Open No. 6-38854 discloses a headrest provided with a link mechanism including a rotatable overturning plate, a rotatable link plate and a movable plate, and rotating the link plate by a motor. There is disclosed a retractable headrest device capable of standing up and falling down. Further, Japanese Patent Application Laid-Open No. 6-62933 discloses that the headrest has an upper and lower divided structure including an upper member and a lower member, and the upper member and the lower member are connected by a link mechanism, so that the upper member is connected to the lower member. A retractable headrest device capable of standing up and falling down is disclosed.

[0007]

However, in the above-mentioned retractable headrest device, a lock mechanism for locking at the standing / falling position is required as a separate member.
Since a motor is needed, there is a problem that the number of parts is large. In addition, when moving manually, it is necessary to manually perform all movements between the standing position and the falling position. There is a problem that the effect of the formula is not sufficiently exhibited and the usability is poor.

The present invention has been made in view of such circumstances, and is configured with a small number of parts, can be easily turned over by the urging force of an urging member such as a spring, and can be easily moved to a standing position. It is an object of the present invention to be able to reliably hold a vehicle at a falling position.

[0009]

The feature of the headrest retractable device according to the present invention, which solves the above-mentioned problem, is that a substantially U-shaped stay and a headrest in which the stay is buried and which is rotatable with respect to the stay are provided. A body, a fixed plate having one end fixed to the stay, a falling plate having one end swingably held by the stay and the other end fixed to the headrest body, and a falling plate in a direction in which the headrest body swings rearward. A lock pin is protruded from one of the fixed plate and the overturning plate, and a lock pin is provided on the other of the fixed plate and the overturning plate at an upright position where the headrest body is substantially vertical. A first locking portion that locks the headrest body to restrict the swinging of the headrest body to the rear side, and temporarily locks the lock pin at a driving position in which the headrest body swings forward from the standing position. A second engaging portion for engaging a first guide portion that swings to the driving position the headrest body from the upright position the locking pin is guided from the first locking portion to the second locking portion,
A third locking portion that locks the lock pin at the overturned position where the headrest body has fallen rearward and becomes substantially horizontal, thereby restricting further swinging of the headrest body to the rear side; A second guide for guiding the headrest body from the drive position to the overturning position by guiding the headrest body from the drive portion to the overturning position from the stop portion, and a headrest body for guiding the lock pin from the third lock portion to the first lock portion. And a third guide portion for swinging the torsion position from the falling position to the standing position. Further, one of the fixed plate and the falling plate has a cam portion along the first guide portion, the second guide portion, and the third guide portion. There is provided a regulating means for regulating the movement of the lock pin so as to move in this order.

The headrest folding device according to the second aspect is characterized in that a substantially U-shaped stay, a headrest body in which the stay is buried and which is rotatable with respect to the stay, and one end of which is fixed to the stay. A stationary plate, a falling plate having one end swingably held by the stay and the other end fixed to the headrest body, and a biasing means for biasing the falling plate in a direction in which the headrest body swings rearward. A lock pin protrudes from one of the fixed plate and the overturning plate, and the other of the fixed plate and the overturning plate locks the lock pin at an upright position where the headrest body is substantially vertical. A first locking portion for restricting swinging to the side, and a lock pin which locks the lock pin at a falling position where the headrest body has fallen to the front side and has become substantially horizontal. A second locking portion for restricting swinging toward the first side, and a first guiding portion for guiding the lock pin from the first locking portion to the second locking portion to rock the headrest body from the standing position to the falling position. A third locking portion for temporarily locking the lock pin at a drive position in which the headrest body swings further forward from the falling position, and guiding the lock pin from the second locking portion to the third locking portion. A second guide portion for swinging the headrest body from the falling position to the drive position by moving the lock pin from the third engagement portion to the first engagement portion to swing the headrest body from the drive position to the upright position. And a lock portion that moves along the first guide portion, the second guide portion, and the third guide portion in this order on one of the fixed plate and the overturning plate. Regulation means to regulate the

[0011]

In the headrest tilting device according to the first aspect of the present invention, first, in a standing position using the headrest main body, the lock pin is locked by the first locking portion, and the rear side of the headrest main body. The swing to the is regulated. Therefore, the back side of the occupant's head can be supported and used as a normal headrest.

When the headrest is set to the falling position, the headrest body is pressed by a hand or the like so as to rotate forward. Then, the urging force of the urging means acts as a reaction force via the lock pin. However, when the urging force is pressed forward against the urging force, the tip of the falling plate swings forward. As a result, the locking of the lock pin at the first locking portion is released, and the lock pin is relatively moved from the first locking portion to the second locking portion by the restricting means guided by the first guide portion. 2 The state is temporarily locked by the locking portion, and the headrest main body is at the driving position.

In the driving position, when the resistance caused by the lock pin being temporarily locked by the second locking portion is detected, the pressing is released. Then, the falling plate swings rearward by the urging force of the urging means. At this time, since the lock pin moves in the direction toward the third locking portion along the second guide portion by the restricting means, the lock pin is guided by the second guide portion without going again to the first locking portion. It relatively automatically moves from the second locking portion to the third locking portion and is locked by the third locking portion.

In this state, the headrest body is in a fall position in which the headrest body has fallen substantially horizontally rearward, and the lock pin is locked by the third locking portion in that state, whereby the headrest body is held in the fall position. You. Therefore, a view from behind is ensured. In order to return the headrest main body from the falling position to the standing position, the headrest main body is pressed so as to swing forward against the urging force of the urging means. As a result, the lock pin separates from the third locking portion, and is relatively moved from the third locking portion to the first locking portion by the guide of the third guide portion without going to the second locking portion again by the restricting means. , And is locked by the first locking portion. Therefore, the headrest body is held in the upright position.

In the headrest tilting device according to the second aspect, first, in the upright position using the headrest main body, the lock pin is locked by the first locking portion, so that the headrest main body can be further moved rearward. Swing is regulated.
Therefore, the back side of the occupant's head can be supported and used as a normal headrest. When the headrest is set to the falling position, the headrest body is pressed by a hand or the like so as to rotate forward. Then, the urging force of the urging means acts as a reaction force via the lock pin. However, when the urging force is pressed forward against the urging force, the tip of the falling plate swings forward. As a result, the locking of the lock pin at the first locking portion is released, and the lock pin is relatively moved from the first locking portion to the second locking portion by the restricting means guided by the first guide portion. The headrest body is locked to the two locking portions, and the headrest body is in a state where swinging to the rear side is restricted.

In this state, the headrest body is in a fall position in which the headrest body has fallen substantially horizontally to the front side, and the lock pin is locked by the second locking portion in that state, whereby the headrest body is held in the fall position. Is done. Therefore, a view from behind is ensured. To return the headrest main body from the falling position to the standing position, the headrest main body is pressed so as to swing forward further against the urging force of the urging means. At this time, the lock pin is moved by the regulating means in the direction from the second locking portion to the third locking portion along the second guide portion and locked by the third locking portion, and the headrest main body is moved to the drive position. Become. In the driving position, the lock pin is in the third position.
Pressing is released when resistance due to being temporarily locked by the locking portion is sensed. Then, the falling plate swings rearward by the urging force of the urging means.

Thus, the lock pin separates from the third locking portion, and is guided from the third guide portion to the first locking portion by the guide of the third guide portion without being directed to the second locking portion again by the restricting means. And is locked by the first locking portion. Therefore, the headrest body is held in the upright position. The same headrest body and stay as those conventionally used can be used.

One of the lock pin and the cam portion is provided on the overturning plate, and the other is provided on the fixed plate. The lock pin may be provided on the fixed plate and the cam portion may be provided on the tipping plate, or the lock pin may be provided on the tipping plate and the cam portion may be provided on the fixed plate. Note that the fixed plate and the overturning plate may be provided separately from each other, or may be provided close to or in contact with each other.

The lock pin is swingably held by a plate provided with the lock pin and protrudes therefrom. To do so, a guide portion such as a long hole or a notch may be formed in the plate, and the lock pin may be passed through the guide portion. The urging means is not particularly limited. However, since a stay is used, it is preferable to use a coil spring through which the stay can be inserted. In addition, as the restricting means for restricting the movement of the lock pin, it is possible to select and use a long hole, a spring, a link mechanism or the like.

[0020]

The present invention will be described below in detail with reference to examples. (Embodiment 1) FIG. 5 shows the entire configuration of a headrest using the tiltable device of the present embodiment. The headrest includes a headrest main body 200, a stay 300, a core 400 held by the stay 300 and embedded in the headrest main body 200, and a folding device 100 disposed in the core 400.
It is composed of And the core material 400 is the folding device 1
When the fall plate 2 swings, the headrest body 200 swings together with the core 400 when the fall plate 2 swings.

The tilting device 100 shown in FIGS. 1 to 4 includes a fixed plate 1 welded and fixed to a stay 300 and a falling plate 2 disposed close to the fixed plate 1 and held swingably on the stay 300. And a swing plate 3 pivotally supported by the fixed plate 1 and a coil spring 4 rotatably inserted into the stay 300.

The fixed plate 1 has a substantially elliptical elongated hole 1.
0 and a pivot hole 11 having a perfect circular shape. on the other hand,
A lock pin 30 protrudes from the swing plate 3, and one end of the lock pin 30 is inserted into the elongated hole 10. Further, a perfect circular projection 31 is formed on the swing plate 3, and is engaged with the pivot hole 11 so as to be swingably held by the fixed plate 1. The swinging of the swinging plate 3 allows one end of the lock pin 30 to move in the elongated hole 10. A locking groove 32 is formed at the other end of the lock pin 30,
One end 40 of the coil spring 4 is locked in the locking groove 32.

The elongated hole 10 has a substantially elliptical shape, and a biasing force acts on the lock pin 30 from one end 40 of the coil spring 4. That is, when the lock pin 30 is located closer to the upper end 10a than the center of the slot 10, the lock pin 10 is urged in the direction toward the upper end 10a, and the lock pin 30 is
The shape of the elongated hole 10 and one end 40 of the coil spring 4 is designed so as to urge the lock pin 10 toward the lower end 10b when the lock pin 10 is located on the lower end 10b side from the center of 0.

A U-shaped notch 20 is formed at one end of the overturning plate 2 and is open at the end face. The notch 20 engages with the stay 300 so as to be able to swing around the stay 300. The other end of the tipping plate 2 has a projecting portion 21 projecting toward the fixed plate 1 and the swinging plate 3.
A locking hole 22 is formed at the tip of the coil spring 4, and the other end 41 of the coil spring 4 is locked in the locking hole 22.

In the upright position where the headrest body 200 is used, the spring force is stored in the coil spring 4, and the falling plate 2 and the swing plate 3
By being urged by the spring force of the coil spring 4 to expand and pressed against the front and back surfaces of the fixed plate 1, the fixed plate 1 is integrally held. Further, a distorted heart-shaped cam hole 5 is formed in the overturning plate 2, and one end of a lock pin 30 protruding from the long hole 10 is inserted into the cam hole 5. A holding plate (not shown) is engaged with the tip of the lock pin 30 to restrict the lock pin 30 from coming out of the cam hole 5 and the elongated hole 10.

The cam hole 5 has a first recess 50 and a second recess 5.
Three concave portions including the first and third concave portions 52 are formed, and the lock pin 30 can be locked in each of the concave portions. A first guide rail 53 is formed between the first recess 50 and the second recess 51 to smoothly connect the two. A second guide rail 54 connects the two smoothly between the second recess 51 and the third recess 52. A third guide rail 55 is formed between the third concave portion 52 and the first concave portion 50 so as to smoothly connect them.

In the tilting device 100 formed as described above, when used as a headrest, the overturning plate 2 is in an upright state as shown in FIG. 2, and the headrest body 200 is in an upright position. The lock pin 30 is engaged with the first concave portion 50. In this state, the shape of the one end 40 of the coil spring 4 and the elongated hole 10 is set so that the lock pin 30 receives an urging force in the direction from the one end 40 of the coil spring 4 toward the upper end 10a of the elongated hole 10. One recess 50 has upper and lower wall surfaces. On the other hand, the tipping plate 2 is urged in the direction of arrow A by the urging force from the other end 41 of the coil spring 4.
Therefore, the lock pin 30 is locked at the upper end 10 a of the elongated hole 10, and is restricted from moving at a position pressed against the wall surface of the first recess 50. This makes the falling plate 2
Is restricted from moving backward (in the direction of arrow A), and the headrest body 200 can reliably support the occupant's head via the core member 400 at the upright position shown in FIG.

When the headrest is to be tilted backward to the rear of the seat back, the headrest body 200 is moved forward (in the direction of the arrow B in FIG. 3) until the angle becomes about 30 degrees against the urging force of the coil spring 4. Swing with force. At this time, as the tipping plate 2 swings forward, the lock pin 30 moves downward in the elongated hole 10 by being pressed from the first guide rail 53. Until the lock pin 30 passes through the center of the long hole 10, the one end 40 of the coil spring 4 urges the lock pin 30 toward the upper end 10 a of the long hole 10. , The one end 40 of the coil spring 4 urges the lock pin 30 toward the lower end 10 b of the elongated hole 10.
Therefore, the lock pin 30 is securely connected to the first guide rail 5.
3 along the cam hole 5. Lock pin 30
The shape of the first guide rail 53 is designed such that the first guide rail 53 moves as such.

Then, as shown in FIG.
Is temporarily locked in the lower end 10 b of the elongated hole 10 and the second concave portion 51. As a result, further rotation of the tipping plate 2 is restricted, and the headrest main body 200 is in a driving position in which swinging is restricted at a position where the headrest body 200 is tilted forward at an angle of about 30 degrees as shown in FIG. At this point, the lock pin 30 engages with the concave portion 42 formed in the one end 40 of the coil spring 4, and the shape effect of the lock pin 30 causes the one end 40 of the coil spring 4 to move.
From the lock pin 30 at the lower end 10b of the long hole 10.
It is a direction toward. Further, the urging force of the coil spring 4 is further increased.

Therefore, when the pressing of the headrest body 200 by manual force is released in the driving position, the falling plate 2 is biased by the other end 41 of the coil spring 4.
Is about to swing in the direction opposite to the arrow B direction. Since a biasing force is applied to the lock pin 30 from the concave portion 42 formed at one end 40 of the coil spring 4 toward the lower end 10 b of the elongated hole 10, the lock pin 30 is located at the lower end of the cam hole 5. Guided along the rail 54, the first recess 5
It goes to the third concave portion 52 without going to zero. As a result, the lock is released, and the headrest main body 200 swings rearward beyond the standing position together with the falling plate 2.

When the lock pin 30 is locked by the third concave portion 52, the tipping plate 2 assumes a substantially horizontal position as shown in FIG. 4, and the headrest body 200 assumes a tipping position shown in FIG. . In this state, a biasing force in the direction of arrow C is acting on the tipping plate 2 from the other end 41 of the coil spring 4. On the other hand, the lock pin 30 is located at the center of the
0 is the direction toward the upper end 10a of the elongated hole 10 and the lower end 10b
4 and equally urged mainly in the forward direction in FIG. Therefore,
The movement of the lock pin 30 is restricted while being locked by the third concave portion 52, and the tipping plate 2 is stably held at the substantially horizontal position. Therefore, the headrest main body 200 is held at the tipping position shown in FIG. .

In order to move from the overturned position to the upright position shown in FIGS. 2 and 5, the headrest body 200 is pressed so as to swing forward by hand against the urging force of the coil spring 4. Then, the lock pin 30 moves from the center of the elongated hole 10 toward the upper end 10a, and an urging force from the one end 40 of the coil spring 4 toward the upper end 10a acts.
It moves along the third guide rail 55 without going to the recess 51, and is locked in the first recess 50. Thereby, the headrest main body 200 returns to the standing position shown in FIG. 5 in which the backward movement is restricted as described above, and the head of the occupant can be reliably supported.

That is, in the headrest tilting device of this embodiment, the coil spring 4, the long hole 10 and the cam hole 5
The restricting means of the lock pin 30 is constituted by the shape of. According to the headrest tilting device of the present embodiment, the headrest can be set to the standing position and the falling position with a simple configuration, and can be reliably held at the standing position and the falling position. In addition, since the urging means and the lock pin regulating means are shared by one coil spring 4, an effect of reducing the number of parts is also provided.

In this embodiment, the lock pin 30 is provided on the fixed plate 1 and the cam hole 5 is formed on the tipping plate 2. However, the shape of the coil spring 4 and the shape of the long hole 10 and the cam hole 5 are appropriately set. By doing, fixed plate 1
It is needless to say that the cam holes 5 can be formed and the lock pins 30 can be provided on the overturning plate 2. (Embodiment 2) The headrest tilting device of this embodiment has the same configuration as that of Embodiment 1 except that a first spring 6 and a second spring (not shown) are used instead of the coil spring 4. In the present embodiment, the first spring 6 and the shape of the long hole 10 and the cam hole 5 constitute the lock pin 30 restricting means.

That is, the tilting device of this embodiment is the same as that shown in FIG.
As shown in FIG. 1A, a fixed plate 1 welded and fixed to a stay 300, a falling plate 2 rotatably disposed around the stay 300 in close proximity to the fixed plate 1, and a fixed plate 1 rotated Swing plate 3 freely pivoted
And is composed of The first spring 6 is suspended between the lock pin 30 and the overturning plate 2. When the lock pin 30 is located on the upper end 10a side from the center of the elongated hole 10, the first spring 6 attaches the lock pin 10 in the direction toward the upper end 10a. The lock pin 30 is moved from the center of the long hole 10 to the lower end 10.
When the lock pin 10 is located on the side b, the lock pin 10 is biased in a direction toward the lower end 10b.

A second spring (not shown) is suspended between the falling plate 2 and the fixed plate 1 and urges the falling plate 2 to rotate backward. In this tilting device, when the tipping plate 2 is swung forward from the standing position shown in FIG. 8A against the urging force of the second spring, as shown in FIG. Until the lock pin 30 swings, an urging force from the first spring 6 toward the upper end 10a of the long hole 10 is acting on the lock pin 30. However, when the lock pin 30 swings by -20 degrees or more, the first spring 6 Cross over,
An urging force acts on the lock pin 30 toward the lower end 10b of the elongated hole 10.

Beyond that point, FIGS. 8 (d) and 9
The lock pin 30 is temporarily locked in the first recess 50 at the drive position tilted 25 degrees shown in FIG. After that, when the pressing is released, the overturning plate 2 tries to swing backward by the urging force of the second spring (not shown). At this time, the lock pin 30 is urged in the direction toward the lower end 10 b of the long hole 10 by the urging force of the first spring 6, so that the lock pin 30 is moved to the second guide rail 54 located at the lower end of the cam hole 5. Moving along the first recess 5
It never returns to zero.

Then, the overturning plate 2 swings by the urging force of the second spring, exceeding the initial state shown in FIG. 9B, and the lock pin 30 shown in FIGS. 9E and 10A.
In the fall position locked by the second concave portion 51, the first spring 6 has again passed the dead center,
, A biasing force acts again from the first spring 6 toward the upper end 10a of the elongated hole 10. Since a biasing force acting rearward from a second spring (not shown) acts on the falling plate 2, the falling plate 2 is held at the falling position by the engagement between the lock pin 30 and the second concave portion 51.

When returning the headrest body from the falling position to the standing position, the falling plate 2 is pressed against the urging force of the second spring (not shown) to swing forward. Then, the lock pin 30 is inserted into the elongated hole 10 from the first spring 6.
1 because the urging force toward the upper end 10a of the
As shown at 0, the lock pin 30 moves along the third guide rail 55 without following the second guide rail 54, and
Locked in the recess 50.

As a result, the headrest body is
It is held at the upright position as shown in FIG. (Embodiment 3) A headrest tilting device according to the present embodiment embodies the invention described in claim 2, and is described in Embodiment 1.
Is equivalent to the headrest tilting device tilted forward by 90 degrees. Each member has exactly the same configuration as that of the first embodiment, and its operation will be described with reference to the drawings to which the same reference numerals as in the first embodiment are attached. The headrest body 200 is not shown, but is fixed to the tilting device as in the first embodiment.

In this headrest tilting device, when used as a headrest, the overturning plate 2 is in an upright state as shown in FIG. 11, and the headrest body 200 is in an upright position. The lock pin 30 is engaged with the third concave portion 52. In this state, although the biasing force from the other end 41 of the coil spring 4 toward the rear acts on the tipping plate 2, the movement is restricted while the lock pin 30 is locked by the third concave portion 52, Since the overturning plate 2 is stably held at the substantially vertical position, the headrest main body 200 is held and used at the upright position.

In order to move from the upright position to the overturning position shown in FIG. 12, the headrest body 200 is pressed so as to swing forward by hand against the urging force of the coil spring 4. Then, the lock pin 30 moves from the center of the long hole 10 toward the left end 10a, and the one end 4 of the coil spring 4 is moved.
Since the urging force from zero to the left end 10a acts, the rock pin 30 swings and the lock pin 30
Move along the third guide rail 55 without going to
Locked in the first recess 50. As a result, the headrest main body 200 is in a substantially horizontal falling position.

In this state, the shape of the one end 40 of the coil spring 4 and the shape of the elongated hole 10 are set so that the lock pin 30 receives a biasing force from the one end 40 of the coil spring 4 toward the left end 10a of the elongated hole 10. And the first recess 5
0 has a wall surface below and forward. On the other hand, the falling plate 2 is urged rearward by an urging force from the other end 41 of the coil spring 4. Therefore, lock pin 3
0 is locked to the left end 10a of the slot 10 and the first
Movement is restricted at a position pressed against the wall surface of the concave portion 50. As a result, the rearward movement of the falling plate 2 is restricted, and the headrest body 200 is held at the falling position shown in FIG.

When the headrest is moved from the falling position to the standing position, the headrest body 200 is further swung forward against the urging force of the coil spring 4 as shown in FIG. At this time, as the tipping plate 2 further swings forward, the lock pin 30 moves rightward in the elongated hole 10 by pressing from the first guide rail 53. Until the lock pin 30 passes through the center of the elongated hole 10, one end 40 of the coil spring 4 is
0 is urged toward the left end 10a of the long hole 10,
When the lock pin 30 passes through the center of the long hole 10, one end 40 of the coil spring 4 urges the lock pin 30 toward the right end 10b of the long hole 10. Therefore, the lock pin 30 reliably moves in the cam hole 5 along the first guide rail 53. The shape of the first guide rail 53 is designed so that the lock pin 30 moves as such.

Then, as shown in FIG.
0 is temporarily locked in the right end 10b of the long hole 10 and the second concave portion 51, and the headrest 200 is at the driving position. This restricts the rotation of the tipping plate 2 and restricts the headrest body 200 from swinging forward. At this time, the lock pin 30 engages with the concave portion 42 formed in the one end 40 of the coil spring 4, and the urging force from the one end 40 of the coil spring 4 is reduced by the shape effect thereof.
To the right end 10b of the long hole 10. Further, the urging force of the coil spring 4 is further increased.

Therefore, when the manual pressure of the headrest body 200 is released at the driving position shown in FIG. 13, the tipping plate 2 tends to swing rearward due to the bias from the other end 41 of the coil spring 4. Since a biasing force is applied to the lock pin 30 from the concave portion 42 formed at one end 40 of the coil spring 4 toward the right end 10 b of the long hole 10, the lock pin 30 is located at the upper part of the cam hole 5. Guided along the rail 54, the first recess 5
It goes to the third concave portion 52 without going to zero. As a result, the lock is released, and the headrest body 200 swings rearward beyond the falling position together with the falling plate 2.

When the lock pin 30 is locked by the third concave portion 52, the overturning plate 2 is at a substantially vertical position as shown in FIG. 11, and the headrest main body 200 is at an upright position. Thus, the headrest body 200 can reliably support the occupant's head.

[0048]

According to the headrest tilting device of the present invention, the headrest body can be easily set in the standing position and the falling position with a simple structure, and can be securely held in the standing position and the falling position. Can be. Therefore, it is inexpensive, has high operation accuracy, and is excellent in use feeling.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a folding device according to an embodiment of the present invention.

FIG. 2 is a front view showing the structure of the tiltable device according to the embodiment of the present invention in an upright position.

FIG. 3 is a front view showing a structure of a tiltable device according to an embodiment of the present invention at a driving position.

FIG. 4 is a front view showing a structure of the tiltable device according to the embodiment of the present invention at a falling position.

FIG. 5 is a cross-sectional view showing a structure of a headrest in an upright position using the tilting device according to one embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a structure at a driving position of a headrest using the tilting device of one embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a structure of a headrest in a fall position using the tilting device according to one embodiment of the present invention.

FIG. 8 is a diagram schematically illustrating a change in a positional relationship between a first spring and a tipping plate corresponding to a change in an angle when the tilting device according to the second embodiment of the present invention moves from a standing position to a driving position. FIG.

FIG. 9 is a diagram schematically illustrating a change in a positional relationship between a first spring and a tipping plate corresponding to a change in an angle when the folding device according to the second embodiment of the present invention moves from a driving position to a falling position. FIG.

FIG. 10 is a diagram schematically illustrating a change in the positional relationship between the first spring and the overturning plate corresponding to a change in angle when the inclining device according to the second embodiment of the present invention moves from the overturned position to the upright position. FIG.

FIG. 11 is a cross-sectional view showing a structure of a headrest at an upright position using a folding device according to a third embodiment of the present invention.

FIG. 12 is a cross-sectional view illustrating a structure of a headrest at a falling position using a folding device according to a third embodiment of the present invention.

FIG. 13 is a cross-sectional view showing a structure at a driving position of a headrest using the folding device according to the third embodiment of the present invention.

[Explanation of symbols]

1: Fixed plate 2: Overturning plate
3: swinging plate 4: coil spring 5: cam hole (cam portion) 1
0: long hole 30: lock pin 50: first concave portion 5
1: second concave portion 52: third concave portion 53: first guide rail 5
4: Second guide rail 55: Third guide rail

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takao Kawakami 3894 Kita-Toyama, Komaki City, Aichi Prefecture Reverse Co., Ltd. F-term (reference) 3B084 DB09 DC02 3B087 DC08

Claims (2)

[Claims] 1. A substantially U-shaped stay, a headrest body in which the stay is embedded and rotatable with respect to the stay, a fixing plate having one end fixed to the stay, and one end swinging on the stay. A tipping plate freely held and having the other end fixed to the headrest body; and a biasing means for biasing the tipping plate in a direction in which the headrest body swings rearward. A lock pin protrudes from one of the plates, and the other of the fixed plate and the overturning plate locks the lock pin at an upright position where the headrest main body is substantially vertical, and the rear side of the headrest main body. A first locking portion for restricting swinging of the headrest body, a second locking portion for temporarily locking the lock pin at a driving position in which the headrest body swings forward from the standing position, Pin with the first A first guide portion for guiding the headrest body from the standing position to the drive position by guiding the headrest body from the standing position to the second locking portion, and a falling position where the headrest body falls down rearward and becomes substantially horizontal A third locking portion that locks the lock pin to restrict further swinging of the headrest body toward the rear, and guides the lock pin from the second locking portion to the third locking portion. A second guide for swinging the headrest body from the driving position to the overturning position, and guiding the lock pin from the third engagement portion to the first engagement portion to move the headrest body to the overturning position. And a third guide portion that swings from the first position to the upright position. The first guide portion, the second guide portion, and the third guide portion are provided on one of the fixed plate and the overturning plate. Restricting the movement of the lock pin so that the lock pin moves in this order along Foldable device of the headrest, characterized in that it comprises a. 2. A substantially U-shaped stay, a headrest body in which the stay is embedded and rotatable with respect to the stay, a fixed plate having one end fixed to the stay, and one end swinging on the stay. A tipping plate freely held and having the other end fixed to the headrest body; and a biasing means for biasing the tipping plate in a direction in which the headrest body swings rearward. A lock pin protrudes from one of the plates, and the other of the fixed plate and the overturning plate locks the lock pin at an upright position where the headrest main body is substantially vertical, and further locks the rear of the headrest main body. A first locking portion that restricts swinging to the side, and a lock pin that locks the lock pin at an overturned position where the headrest body has fallen to the front side and becomes substantially horizontal, and swings the headrest body to the rear side. Movement A second locking portion win, second the locking pin from the first locking portion
A first guide for guiding the headrest main body from the standing position to the overturning position by guiding the locking pin to the locking portion; and a lock position at the drive position at which the headrest main body is further swung forward from the overturning position. A third locking portion for temporarily locking, and a third for guiding the lock pin from the second locking portion to the third locking portion to swing the headrest body from the overturned position to the driving position. A cam, comprising: a second guide portion; and a third guide portion for guiding the lock pin from the third locking portion to the first locking portion to swing the headrest body from the driving position to the upright position. And further restricts movement of the lock pin so that one of the fixed plate and the overturning plate moves in this order along the first guide portion, the second guide portion, and the third guide portion. A headrest folding device comprising a regulating means.