WO2020183905A1

WO2020183905A1 - Headrest

Info

Publication number: WO2020183905A1
Application number: PCT/JP2020/001445
Authority: WO
Inventors: 慶倫谷口; 小林　徳三; 現清水
Original assignee: 備前発条株式会社
Priority date: 2019-03-14
Filing date: 2020-01-17
Publication date: 2020-09-17
Also published as: JP6579535B1; JP2020147212A

Abstract

A headrest: configured to be adjustable in the forward-backward direction and comprising support mechanisms (5, 6) for supporting a second member (4) with respect to a first member (3) in a state in which the second member can move forward and backward, a backward movement-regulating member (7) for allowing forward movement of the second member (4) at each use position while regulating backward movement, and a backward movement regulation-releasing member (8) for moving the backward movement-regulating member (7) to the backward movement regulation-releasing side when the main headrest body (1) is moved to a forward area outside of the range of use that is further forward than the forwardmost use position; and configured so as to also comprise a forward movement-regulating member (9) for regulating the forward movement of the second member (4) by coming into contact with the first member (3) when the main headrest body (1) is moved forward and reaches the forwardmost use position and an operation means (10) for moving the forward movement-regulating member (9) to the forward movement regulation-releasing side.

Description

Headrest

The present invention relates to a front-rear adjustable headrest in which the front-rear position of the headrest body that supports the user's head can be adjusted.

As a headrest provided on the upper part of the seat back of an automobile or the like, a front-rear adjustable type is known in which the front-rear position of the headrest portion (headrest body) that supports the user's head can be adjusted. The front-rear adjustable headrest moves the headrest body forward from the rearmost position (the rearmost position in the range of use; the same applies hereinafter) by grasping or pushing the headrest body by hand. In many cases, the headrest body can be positioned at a specific use position by releasing the hand at the use position.

In this type of headrest, the headrest body within the range of use is one-way only for forward movement. That is, the headrest main body within the range of use can be moved forward, but cannot be moved backward. When moving the headrest body backward, move the headrest body to the front section outside the usage range further forward than the frontmost position (the frontmost position in the usage range. The same shall apply hereinafter) to the usage range. It is necessary to release the regulation by the member (rear movement restricting member) that regulated the backward movement of the headrest body at a certain time. A front-rear adjustable headrest having such a structure is described in, for example, Patent Document 1.

Japanese Patent No. 5902847

However, in the headrest of Patent Document 1, the range of use (in the same document, the range from the "initial position" shown in FIG. 3 (a) to the "forward adjustment limit position" shown in FIG. 3 (b)) When a forward force is continuously applied to a certain headrest body, the headrest body exceeds the frontmost position in use (in the same document, the "forward adjustment limit position" shown in FIG. 3 (b)) and is out of the range of use. Then, in addition to moving from the "forward adjustment limit position" shown in FIG. 3 (b) to the "forward rotation limit position" shown in FIG. 3 (c)). , When the headrest body moves forward to the front section outside the range of use, the restriction on backward movement by the backward movement restricting member (“lock plate 60” shown in FIG. 3 in the same document) is automatically released. It was.

Therefore, in the headrest of Patent Document 1, if a front collision accident occurs while the headrest body is in the range of use, the headrest body moves forward from the range of use to the front section outside the range of use due to inertial force and is rearward of the headrest body. The movement restrictions have been lifted, and the headrest body that started backward movement (swing back) in reaction can move backward to the rearmost position in use (in the same document, the "initial position" shown in FIG. 3A). There is a possibility that the headrest body cannot sufficiently support the user's head, which is swayed back like the headrest body, in the front position.

In this respect, in the conventional front-rear adjustable headrest having a structure similar to the headrest of Patent Document 1, the urging force of the rear urging member that urges the headrest body rearward is strengthened, and the headrest body is difficult to move forward. Measures have been taken to narrow the range of use of the headrest body (shorten the distance from the rearmost position to the frontmost position). However, the former measure has a drawback that a large operating force is required to adjust the position where the headrest body is used. Further, the latter measure has a drawback that the adjustment allowance of the usage position of the headrest body becomes narrow.

The present invention has been made to solve the above problems, and even when a frontal collision accident occurs, the headrest main body within the range of use is not restricted from being moved backward without permission, and the headrest body is shaken back. It provides a headrest that can support the user's head in a front position by a headrest body. It is also an object of the present invention to provide a headrest that does not need to increase the operating force required for adjusting the position of the headrest body or sacrifice the adjustment allowance for the position of use of the headrest body.

The above issues are
The headrest body that supports the user's head at the top of the seat back,
The first member, which is provided so that it does not move back and forth with respect to the seat back,
The second member fixed to the headrest body and
A support mechanism that supports the second member in a state where it can move back and forth with respect to the first member,
A rear movement restricting member that regulates the rear movement while allowing the front movement of the second member at each usage position from the rearmost position to the frontmost position of the headrest body.
When the headrest body is moved further forward than the frontmost position to the front section outside the usage range, it acts on the rear movement restricting member, and by moving the rear movement restricting member to the rear movement restricting release side, the second member A member that releases restrictions on backward movement and a member that releases restrictions on backward movement,
A front-rear adjustable headrest equipped with a reset mechanism that returns the rear movement restriction release member to the initial position while moving the headrest body backward from the front section outside the range of use to the rearmost position of use.
When the headrest body moves forward from the rearmost position of use and reaches the frontmost position of use, it contacts the first member (including the case where it contacts a member that does not move in the front-rear direction with respect to the first member). The forward movement restricting member that regulates the forward movement of the two members,
When an operating force is applied, it acts on the forward movement restricting member to move the forward movement restricting member to the forward movement restricting release side, thereby further providing an operating means for releasing the restriction on the forward movement of the second member. The solution is to provide a featured headrest.

Here, the "regulation" in the "restriction of backward movement" is limited to the case where, for example, hard metal parts come into contact with each other and are strongly regulated in a state where they do not move at all from the contacted place. It also includes cases where parts with a certain degree of elasticity come into contact with each other and are regulated to be non-strong (elastic) in a state where they can move slightly from the contacted place.

As described above, when the headrest body moves forward to the frontmost position in use, the forward movement restricting member comes into contact with the first member to restrict the forward movement of the second member, and the operating means is operated. Unless otherwise, the regulation of the forward movement of the second member by the forward movement restricting member is not lifted, so that even if a front collision accident occurs and a forward inertial force is generated in the headrest body, it can be used within the range of use. It is possible to prevent a certain headrest main body from moving beyond the frontmost position of use to a front section outside the use range (a section in which the state in which the rear movement of the second member is restricted by the rear movement restricting member is released). Therefore, it is possible to prevent the restriction on the backward movement of the headrest body within the range of use from being lifted without permission. Therefore, the head of the user who is rocked back by the front collision accident can be supported by at least the headrest main body in the frontmost position.

In the headrest of the present invention, the structure of the operating means that acts on the forward movement restricting member to release the restriction on the forward movement of the second member is not particularly limited. Examples of the operating means include those provided with push buttons, levers, and the like. However, in the front-rear adjustable headrest, a rear urging member that urges the headrest body to the rear is usually provided so that the headrest body does not rattle, but in a conventional headrest that operates a push button or a lever, the headrest body is usually provided. In many cases, the push button or lever must be operated against the urging force of the rear urging member. Since the rear urging member is for urging a heavy object such as a headrest body, the urging force is set relatively strong. Therefore, when trying to operate the push button or the lever against the rear urging member, it is necessary to apply a large operating force to the push button or the lever.

In this respect, the lever can be set longer and the principle of leverage can be made easier to operate, so that it can be operated with a small operating force, but the push button is difficult to devise. For this reason, pushbuttons tend to be shunned as an operating means in headrests, and levers tend to be preferred. However, the lever has a drawback that an unintended operating force is easily applied, a drawback that the operation is troublesome, and a drawback that the place where the lever is provided is easily restricted.

As described above, there are drawbacks in both the case where the push button is adopted as the operation means and the case where the lever is adopted, but these drawbacks can be eliminated by adopting the following structure. That is, assuming that the operating means is provided with a push button that can be pushed in the left-right direction of the headrest body, when the push button is pushed in the left-right direction, the forward movement restricting member also moves in the left-right direction and moves forward with respect to the first member. The structure is such that the restriction on the forward movement of the second member is released when the contact of the regulating member is released. As a result, the operation of the push button (operating means) can be lightened. This is because, in the headrest of the present invention, the urging force (rear urging force) by the rear urging member is received by the rear movement restricting member and is not applied to the forward movement restricting member. This is because only the forward movement restricting member can be directly moved by operating the button. Therefore, it is possible to use a push button that is easily operated by a fingertip or the like as an operating means in the headrest, but to be able to operate with an extremely small operating force.

In the headrest of the present invention, the specific structure of the support mechanism is not particularly limited as long as it can support the second member in a state where it can move back and forth with respect to the first member. The structure of the support mechanism mainly includes the following two types.

First,
Support mechanism,
In addition to the first and second members
A front connecting member that connects the front part of the first member and the front part of the second member,
A rear connecting member that connects the rear portion of the first member and the rear portion of the second member, a first member and a front connecting member, a first member and a rear connecting member, a second member and a front connecting member, and a second member. A four-bar link composed of four rotating pins that rotatably connect the rear connecting member and the rear connecting member.
The structure is such that the second member moves back and forth with respect to the first member by the four-section link mechanism.
In the following, a support mechanism having this structure may be referred to as a "four-section link type support mechanism".

next,
The support mechanism is an arm member that swingably connects the first member and the second member.
The structure is such that the second member swings in the front-rear direction with respect to the first member by the arm member.
In the following, a support mechanism having this structure may be referred to as a "swing arm type support mechanism". The swing arm type support mechanism includes an upward swing type that moves the upper part of the headrest body back and forth (swings in the front-back direction) around the lower part of the headrest body, and a lower part of the headrest body centered on the upper part of the headrest body. There is a downward swing type that moves back and forth (swings in the front and back direction).

In the headrest of the present invention, the specific structure of the rear movement restricting member is not particularly limited as long as it regulates the rearward movement of the second member while allowing the forward movement of the second member at each use position of the headrest main body. The structure of the backward movement restricting member mainly includes the following two types.

First,
A plurality of locking portions α ₁ are provided on the first member at a predetermined front-rear pitch.
The rear movement restricting member is a lock plate that is swingably attached to the second member or the support mechanism and has a locked portion α _{2 that} is locked to the locking portion α ₁ on the tip side.
When trying to move the headrest body in the used position forward, the locked portion α ₂ that was locked backward with respect to the locking portion α _{1 of} one of the plurality of locking portions α ₁ By separating forward from the one locking portion α ₁ , the forward movement of the second member is permitted.
When the headrest body in the use position tried to rearward movement is that the engaged portion alpha ₂ for one of the locking portions alpha ₁ of the plurality of engaging portions alpha ₁ is engaged with the rearward The structure is such that the backward movement of the second member is restricted.
In the following, the rear movement restricting member having this structure may be referred to as a “lock plate type rear movement restricting member”.

next,
The rear movement restricting member is a lock spring that is externally fitted to the first member side shaft member provided on the first member and the support mechanism side shaft member provided on the support mechanism in a tightened state.
When the headrest body in the used position is to be moved forward, the lock spring loosens with respect to the support mechanism side shaft member, so that the second member is allowed to move forward.
When the headrest main body in the used position is to be moved backward, the lock spring tightens the support mechanism side shaft member to regulate the backward movement of the second member.
In the following, the rear movement restricting member having this structure may be referred to as a "lock spring type rear movement restricting member".

As a lock spring type backward movement regulation member,
When trying to move the headrest body in the used position backward, the lock spring tightens the support mechanism side shaft member so that the backward movement of the second member is strongly regulated. ,
When trying to move the headrest body in the used position backward, the lock spring tightens the support mechanism side shaft member to regulate the backward movement of the second member, but the impact is more than a predetermined value (for example, 882N) backward. When a force is applied, the shaft member on the side of the first member slips against the lock spring, so that the headrest body moves backward while absorbing the impact. ..
The buffer regulation type has the advantage that the impact applied from the headrest body to the user's head when the headrest body receives the user's head can be softened by the damper action and friction braking action of the lock spring. doing.

In the headrest of the present invention
A pair of left and right headrest stays that are inserted so that they can be raised and lowered with respect to the upper part of the seat back,
In addition to being equipped with a vertical position adjustment mechanism for adjusting the vertical position of the headrest body,
Vertical position adjustment mechanism, locked portion beta ₂ to be locked to one of the locking portion beta ₁ of the plurality of engaging portions beta ₁ provided with a predetermined vertical pitch on the outer peripheral portion of at least one of the headrest stays Locking member for vertical position adjustment
It has a guide holder that is fixed to the first member and guides the locking member for vertical position adjustment while sliding in a direction substantially perpendicular to the headrest stay.
When the operating means is operated, the forward movement restricting member moves to the forward movement restricting release side, and the contacted portion provided on the vertical position adjusting locking member is pushed to lock the locking portion β ₁ and the locked portion β. It is also preferable to move in a series to the side where the lock with ₂ is released.
This makes it possible to consolidate the operating means in the headrest and simplify the mechanism and operating method of the headrest.

As described above, according to the present invention, even when a frontal collision accident occurs, the headrest of the user who is swung back is headrested so that the restriction on the backward movement of the headrest body within the range of use is not released without permission. The body makes it possible to provide a headrest that can be supported in the front position. Further, for that purpose, it is not necessary to increase the operating force required for adjusting the position of the headrest main body or sacrifice the adjustment allowance of the used position of the headrest main body.

FIG. 5 is a cross-sectional view showing how the headrest main body is moved forward from (a) the rearmost position of use, (b) the frontmost position of use, and (c) the front section outside the range of use in the headrest of the first embodiment. It is sectional drawing which showed the state which (a) the forward movement of a headrest main body was restricted, and (b) the state which the regulation of the forward movement of a headrest main body was lifted in the headrest of 1st Embodiment. It is sectional drawing which showed the mode that the headrest main body is moved forward from (a) the rearmost position of use, (b) the frontmost position of use, and (c) the front section outside the use range in the headrest of the second embodiment. In the headrest of the second embodiment, (a) a state in which the forward movement and vertical movement of the headrest main body are restricted, (b) a state in which the restrictions on forward movement and vertical movement of the headrest main body are released, and (c) a headrest. It is sectional drawing which showed the state which moved forward to the front section outside the use range, respectively. FIG. 5 is a cross-sectional view showing a lock spring used as a rearward movement restricting member in the headrest of the third embodiment cut by a plane including the center line thereof. It is a figure explaining the operation of the free end portion of a lock spring in the headrest of the third embodiment.

A preferred embodiment of the headrest of the present invention will be described more specifically with reference to the drawings. In the following, the headrest of the present invention will be described with reference to three embodiments from the first embodiment to the third embodiment as examples. However, the technical scope of the headrest of the present invention is not limited to these embodiments, and can be appropriately modified as long as the gist of the present invention is not impaired.

1. 1. Headrest of the First Embodiment First, the headrest of the first embodiment will be described. FIG. 1 shows how the headrest main body 1 is moved forward from (a) the rearmost position of use, (b) the frontmost position of use, and (c) the front section outside the range of use in the headrest of the first embodiment. It is a sectional view. The cross-sectional view of FIG. 1 shows the headrest main body 1 cut in a plane perpendicular to the left-right direction. FIG. 2 is a cross section showing a state in which the forward movement of the headrest main body 1 is restricted and a state in which the forward movement of the headrest main body 1 is released in the headrest of the first embodiment. It is a figure. The cross-sectional view of FIG. 2 shows the headrest main body 1 cut in a plane perpendicular to the front-rear direction.

As shown in FIG. 1, the headrest of the first embodiment includes a headrest main body 1, a second member 4 fixed thereto, a headrest stay 2, a first member 3, a front connecting member 5, and a rear connecting member 5. It includes a member 6, a rear movement restricting member 7, a rear movement restricting release member 8, a forward movement restricting member 9, an operating means 10, and the like.

The headrest main body 1 is for supporting the head of a person (user) seated in the seat from behind, and is attached to the upper part of the headrest stay 2. The headrest stay 2 is arranged above the seat back of an unillustrated seat. The headrest stay 2 is inserted into a stay holder (not shown) provided on the upper part of the seat back, and is attached to the seat back in a state where the vertical position can be adjusted by the stay holder.

The first member 3 is provided so as not to move back and forth with respect to the seat back, and in the headrest of the first embodiment, the first member 3 is fixed to the upper part of the headrest stay 2 by welding. The first member 3 is provided with a plurality of locking portions α ₁ (five locking portions α _{1 in} the example of FIG. ₁ ) at a predetermined front-rear pitch. The second member 4 is fixed to the headrest main body 1 (in the headrest of the first embodiment, the inner surface of the case of the headrest main body 1) in a stationary state.

The front connecting member 5 and the rear connecting member 6 connect the second member 4 to the first member 3 in a state where the second member 4 can be moved back and forth. The lower portion of the front connecting member 5 is rotatably connected to the front portion of the first member 3 via a rotating pin 11, and the upper portion of the front connecting member 5 is in front of the second member 4. It is rotatably connected to the portion via a rotating pin 12. A rear urging member 15 is provided in the vicinity of the rotation pin 12 to urge the headrest main body 1 rearward by urging the second member 4 and the front connecting member 5. On the other hand, the lower portion of the rear connecting member 6 is rotatably connected to the rear portion of the first member 3 via a rotating pin 13, and the upper portion of the rear connecting member 6 is connected to the second member. It is rotatably connected to the rear portion of 4 via a rotating pin 14.

In addition to the first member 3 and the second member 4, the front connecting member 5, the rear connecting member 6, and the four

rotating pins

11, 12, 13, and 14 form a four-bar link. The second member 4 and the headrest main body 1 to which the second member 4 is fixed are supported by the four-bar link in a state of being movable back and forth with respect to the first member 3.

The rear movement restricting member 7 moves forward of the second member 4 at each use position from the rearmost position of use shown in FIG. 1 (a) to the frontmost position of use shown in FIG. 1 (b). It is designed to regulate backward movement while allowing for. In the headrest of the first embodiment, the rear movement restricting member 7 is a plate-shaped member (lock plate 16) swingably attached to the front connecting member 5. The tip end side (swinging end side) of the lock plate 16 (rear movement restricting member 7) is a locked portion α ₂ for locking to the locking portion α ₁ of the first member 3. Normally, the lock plate 16 is always urged in the locking direction (the direction in which the locked portion α ₂ is locked to the locking portion α ₁ ) by an urging member (lock urging member) (not shown). It has become.

When a forward operating force is applied to the headrest body 1 in the used position, the locked portion α ₂ that has been locked backward with respect to a certain locking portion α ₁ separates forward from the locking portion α _1. and, by overcoming the convex portion in front of the locking portion alpha _1, so locked to the preceding engaging portion alpha _1. As described above, when the headrest main body 1 is in the use position, the headrest main body 1 is allowed to move forward. On the other hand, when a backward operating force is applied to the headrest main body 1 in the used position, the locked portion α ₂ is brought into contact with the locked portion α ₁ which is locked at that time more strongly backward. become. Therefore, when the headrest main body 1 is in the used position, the backward movement of the headrest main body 1 is restricted.

The rear movement restricting member 8 acts on the rear movement restricting member 7 when the headrest main body 1 is moved from the frontmost position shown in FIG. 1 (b) to the front section outside the operating range shown in FIG. 1 (c). Then, the lock plate 16 (rear movement restricting member 7) is moved to the rear movement restriction release side (in the headrest of the first embodiment, the tip of the lock plate 16 is moved upward).

The specific structure of the rearward movement restriction release member 8 is not particularly limited as long as it exhibits the above functions. In the headrest of the first embodiment, the rearward movement restriction release member 8 is a plate-shaped member (unlock release plate 17) attached to the front portion of the first member 3. The unlock plate 17 is supported in a state where it can swing (rotate) with respect to the first member 3 about the rotation pin 11, and the lock regulating member 150 in FIG. 7 of Japanese Patent No. 6012840 The same operation as that of the lock switching member 70 in FIG. 3 of Japanese Patent No. 5902847 is performed.

That is, one side surface of the unlock plate 17 is in contact with one side surface of the front side connecting member 5, and the front side connecting member 5 rotates about the rotation pin 11 (relative to the first member 3). (Rotation) Then, due to the frictional force acting between the unlock plate 17 and the front connecting member 5, the unlock plate 17 also rotates together with the front connecting member 5 (integrally rotates forward or backward). However, the regulation pin 19 fixed to the first member 3 hits the end of the arc-shaped (arc-shaped centered on the rotating pin 11) elongated hole 18 provided on the unlock plate 17. Upon contact, the forward or backward rotation of the unlock plate 17 is restricted so that the front connecting member 5 rotates forward or backward with the unlock plate 17 left behind.

In the headrest of the first embodiment, the regulation pin 19 and the elongated hole 18 forward the headrest main body 1 from the frontmost position (FIG. 1 (b)) to the front section outside the range of use (FIG. 1 (c)). While moving, it not only functions as a mechanism (rear movement restriction release mechanism) that releases the restriction on the rear movement of the headrest body 1 by the lock plate 16 (rear movement restriction member 7), but also moves the headrest body 1 out of the range of use forward. While moving backward from the section to the rearmost position in use, it also functions as a mechanism (reset mechanism) that re-emulates the restriction of backward movement of the headrest body 1 by the lock plate 16 (rear movement restricting member 7). ..

The forward movement restricting member 9 comes into contact with the first member 3 when the headrest main body 1 moves forward from the rearmost position in FIG. 1A and reaches the frontmost position in FIG. 1B. It regulates the forward movement of the second member 4. When the forward movement of the second member 4 is restricted, the forward movement of the headrest main body 1 integrated with the second member 4 is also restricted. The specific structure of the forward movement restricting member 9 is not particularly limited as long as it exhibits the above functions. In the headrest of the first embodiment, the forward movement restricting member 9 is a plate-shaped member attached to the rear portion of the second member 4 so as to face backward. The forward movement restricting member 9 can move in the left-right direction with respect to the second member 4, but cannot move in the front-rear direction or the rotation direction.

By providing the forward movement restricting member 9, even if the headrest main body 1 is to be moved forward from the frontmost position in FIG. 1B to the front section outside the usage range in FIG. 1C, the forward movement restricting member 9 is provided. Unless the restriction on the forward movement of the headrest body 1 (second member 4) is released, the headrest body 1 cannot be moved forward, and the restriction on the backward movement of the headrest body 1 by the lock plate 16 can be released. It is not possible. For this reason, even if a frontal collision accident occurs and a forward inertial force is generated in the headrest body 1, the restriction on the backward movement of the headrest body 1 within the range of use is not lifted without permission, and the front It is possible to support the user's head, which is shaken back by a collision accident, with at least the headrest main body 1 at the frontmost position of use.

The operating means 10 is a portion to which a user or the like applies an operating force in order to release the restriction on the forward movement of the headrest main body 1 by the forward movement restricting member 9. In the headrest of the first embodiment, the operating means 10 is a push button 20 that can be pushed in the left-right direction of the headrest main body 1. When the push button 20 is pushed in from the state shown in FIG. 2 (a) to the state shown in FIG. 2 (b), the left and right slide members 21 provided on the back side of the push button 20 and the left and right slide members 21 are integrated. The forward movement restricting member 9 which is fixed to the object is pushed to the back side, and the forward movement restricting member 9 and the first member 3 are displaced in the left-right direction. The restrictions on forward movement have been lifted.

The left and right slide members 21 are constantly urged toward the push button 20 by the left and right slide member urging means 22. Therefore, when the push button 20 is released, the left and right slide members 21 are automatically returned to the initial positions shown in FIG. 2A, and the push buttons 20 are also pushed outward by the left and right slide members 21 to the initial positions. It is designed to automatically return to. The form of the left and right slide members 21 is not particularly limited, but in the headrest of the first embodiment, one steel wire is bent into a "U" shape. The left and right slide members 21 can be moved only in the left-right direction by being inserted into the guide holes 23 formed in the partition wall of the case of the second member 4 or the headrest main body 1.

2. 2. The headrest of the second embodiment Next, the headrest of the second embodiment will be described. Regarding the headrest of the second embodiment, mainly the parts different from the headrest of the first embodiment will be described, and the description of the parts having the same operation and function as the headrest of the first embodiment will be omitted as much as possible. As for the configuration not particularly mentioned in the headrest of the second embodiment, the same configuration as described in the description of the headrest of the first embodiment can be adopted.

FIG. 3 shows how the headrest main body 1 is moved forward from (a) the rearmost position of use, (b) the frontmost position of use, and (c) the front section outside the range of use in the headrest of the second embodiment. It is a sectional view. The cross-sectional view of FIG. 3 shows the headrest main body 1 cut in a plane perpendicular to the left-right direction. FIG. 4 shows, in the headrest of the second embodiment, (a) a state in which the forward movement and the vertical movement of the headrest main body 1 are restricted, and (b) a state in which the regulation of the forward movement and the vertical movement of the headrest main body 1 is released. It is sectional drawing which showed the state which (c) the headrest main body 1 was moved forward to the front section outside the use range. The cross-sectional view of FIG. 4 shows the headrest main body 1 cut by a plane perpendicular to the vertical direction, and shows the left half of the headrest main body 1.

In the headrest of the first embodiment described above, as shown in FIG. 1, the forward movement restricting member 9 was attached to the second member 4. On the other hand, in the headrest of the second embodiment, as shown in FIG. 3, the forward movement restricting member 9 is indirectly attached to the first member 3. However, the point that the forward movement restricting member 9 is integrally fixed to the left and right slide members 21 is the same as that of the headrest of the first embodiment.

Further, in the headrest of the first embodiment, the left and right slide members 21 can move in the left-right direction with respect to the headrest main body 1, but the relative vertical positions of the left and right slide members 21 with respect to the headrest main body 1 do not change. Was there. On the other hand, in the headrest of the second embodiment, the left and right slide members 21 move in the left-right direction with respect to the headrest main body 1 as shown in FIG. 4, and further, as shown in FIG. 3, the headrest main body 1 The structure is such that the relative vertical position of the left and right slide members 21 with respect to the relative changes. That is, while the vertical positions of the left and right slide members 21 with respect to the headrest stay 2 remain constant, the first member 3, the second member 4, the front connecting member 5, the rear connecting member 6, and the four

rotating pins

11, 12, The relative vertical position of the left and right slide members 21 with respect to the headrest main body 1 is changed by the operation of the four-bar link composed of 13 and 14. Similar to the headrest of the first embodiment, the left and right slide members 21 have a form in which one steel wire is bent in a "U" shape, and the left and right slide members 21 are relative to the headrest main body 1. When moving vertically, one of the rod-shaped portions is guided in the vertical direction by a guide groove in the vertical direction provided in the guide 33 for the left and right slide members. Therefore, when the headrest main body 1 is at the rearmost position in FIG. 3A, the forward movement restricting member 9 fixed to the rear portion of the left and right slide members 21 is near the inner bottom portion of the headrest main body 1, but the headrest. When the main body 1 is moved forward, the forward movement restricting member 9 moves forward together with the headrest main body 1 and moves relatively upward in the headrest main body 1.

When the headrest body 1 continues to move forward and the headrest body 1 reaches the frontmost position in FIG. 3 (b), the front movement restricting member 9 fixed to the rear portion of the left and right slide members 21 is attached to the contact plate 24. Contact. The contact plate 24 is integrally fixed to the lower side of the first member 3 (FIG. 3). Since the first member 3 to which the contact plate 24 is fixed cannot move back and forth with respect to the headrest stay 2, when the forward movement restricting member 9 comes into contact with the contact plate 24, the headrest body 1 is restricted from moving forward. It will be in the state of being.

As a result, in the headrest of the second embodiment as well as the headrest of the first embodiment, the headrest main body 1 is moved forward from the frontmost position of use in FIG. 3 (b) to the front section outside the use range of FIG. 3 (c). Even if it is attempted, the headrest body 1 cannot be moved forward unless the restriction on the forward movement of the headrest body 1 by the forward movement restricting member 9 is lifted, and the restriction on the backward movement of the headrest body 1 by the lock plate 16 is restricted. It cannot be released.

In the headrest of the second embodiment, when the push button 20 is pushed to the back side, the left and right slide member 21 and the forward movement restricting member 9 are pushed to the back side, and the front movement restricting member 9 and the first member 3 are left and right. Similar to the headrest of the first embodiment, the headrest is displaced in the direction and the restriction on the forward movement of the first member 3 by the forward movement restricting member 9 is released. However, in the headrest of the second embodiment, as shown in FIG. 4B, when the push button 20 is pushed inward, the forward movement restricting member 9 is inserted into the slit 25 provided in the contact plate 24. It is designed to move to the overlapping position. When the headrest main body 1 is moved forward from the state shown in FIG. 4B, the forward movement restricting member 9 is inserted into the slit 25 as shown in FIG. 4C.

Further, in the headrest of the first embodiment, when the push button 20 is pushed in, only the restriction on the forward movement of the headrest main body 1 by the forward movement restricting member 9 is released. On the other hand, in the headrest of the second embodiment, when the push button 20 is pushed in, not only the forward movement of the headrest main body 1 is restricted by the forward movement restricting member 9, but also the vertical direction of the headrest main body 1 by the vertical position adjusting mechanism 26. The restrictions on the movement of the car have also been lifted.

That is, when the push button 20 is not pushed, as shown in FIG. 4A, the locking member 27 for adjusting the vertical position is covered with respect to the locking portion β ₁ provided on the outer peripheral portion of the headrest stay 2. When the lock portion β ₂ is locked and the headrest main body 1 cannot be moved in the vertical direction with respect to the headrest stay 2, when the push button 20 is pushed in, as shown in FIG. 4B, the front The movement restricting member 9 slides to the back side to release the restriction on the forward movement of the headrest body 1, and the vertical position adjusting locking member 27 is also pushed by the left and right slide members 21 to move to the back side. As a result, the locked portion β ₂ is released from the locked portion β ₁ , and the headrest main body 1 can be moved in the vertical direction. In the headrest of the second embodiment, as shown in FIG. 3, the vertical position adjusting locking member 27 is housed in the groove-shaped contact plate 24, and the inside of the groove of the contact plate 24 is accommodated. It is designed to be guided in the left-right direction. That is, the abutting plate 24 is not only a portion for abutting the forward movement restricting member 9, but also a guide for guiding the locking member 27 for adjusting the vertical position while sliding in a direction substantially perpendicular to the headrest stay 2. It is a part that also functions as a holder. However, the guide holder may be formed of a member different from the contact plate 24 as long as it is fixed to the first member 3.

A plurality of locking portions β ₁ including those shown in FIG. 4 are provided on the outer peripheral portion of the headrest stay 2 at a predetermined vertical pitch, and the locked portions β ₂ are locked. The height of the headrest main body 1 can be adjusted by switching the stop portion β ₁ . Headrest stay 2, usually, when provided in the left and right, up and down position adjustment composed of a plurality of locking portions beta ₁ of the headrest stay 2, the engaged portion beta ₂ of the vertical position adjusting locking member 27 The mechanism 26 may be provided only on at least one of the headrest stays 2 side.

3. 3. The headrest of the third embodiment Next, the headrest of the third embodiment will be described. Regarding the headrest of the third embodiment, mainly the parts different from the headrests of the first embodiment and the second embodiment will be described, and the parts having the same operation and function as the headrests of the first embodiment and the second embodiment will be described. The description will be omitted as much as possible. As for the configuration not particularly mentioned in the headrest of the third embodiment, the same configuration as described in the description of the headrest of the first embodiment and the second embodiment can be adopted.

In the headrests of the first embodiment and the second embodiment described above, as shown in FIG. 1 or 3, the lock plate 16 was used as the rear movement restricting member 7. On the other hand, in the headrest of the third embodiment, the lock spring 28 shown in FIG. 5 is used as the rear movement restricting member 7. FIG. 5 is a cross-sectional view showing the lock spring 28 used as the rearward movement restricting member 7 cut in a plane including the center line L in the headrest of the third embodiment.

As shown in FIG. 5, the lock spring 28 is a coil spring that is externally fitted to the first member side shaft member 29 and the support mechanism side shaft member 30 coaxially arranged on the center line L in a tightened state. ing. One end of the lock spring 28 is a fixed end 31 fixed to the first member side shaft member 29, and the other end is a free end 32 not fixed to the support mechanism side shaft member 30 or the like. .. The first member side shaft member 29 is attached to the first member 3 (see FIG. 1 and the like), and the support mechanism side shaft member 30 is attached to a support mechanism such as the front connecting member 5. The lock spring 28 operates in the same manner as the coil spring 5 in FIG. 3 of Japanese Patent No. 5654177.

That is, when the headrest main body 1 is to be moved forward, the lock spring 28 is in a loosened state with respect to the support mechanism side shaft member 30, so that the headrest main body 1 is allowed to move forward, but the headrest main body 1 When trying to move the headrest backward, the lock spring 28 is in a state of tightening the support mechanism side shaft member 30, so that the backward movement of the headrest main body 1 is restricted. However, when the headrest main body 1 is moved to the front section outside the range of use, a member corresponding to the rear movement restriction release member 8 (see FIG. 1) comes into contact with the free end portion 32 of the lock spring 28, and the member thereof abuts. When the free end portion 32 is pressed in the direction of loosening the lock spring 28, the lock spring 28 is forcibly loosened with respect to the support mechanism side shaft member 30, so that the headrest body 1 is allowed to move backward. It has become like.

For reference, FIG. 6 shows the operation of the free end 32 of the lock spring 28. FIG. 6A shows a state in which the headrest body 1 is in the used position, and FIG. 6B shows that the headrest body 1 moves to the front section outside the range of use, and the restriction on the backward movement of the headrest body 1 is lifted. 6 (c) shows a state in which the headrest main body 1 is moved backward from the state shown in FIG. 6 (b), and the backward movement of the headrest main body 1 is regulated again. When the headrest main body 1 moves forward from the state shown in FIG. 6A, the free end portion 32 of the lock spring 28 is pressed by the first cam 34 in the loosening direction, and among them, it is shown in FIG. 6B. As described above, the free end portion 32 is locked to the holding locking portion 36 by the auxiliary cam 35, and the lock spring 28 is held in a loosened state. That is, the state in which the restriction on the backward movement of the headrest main body 1 is released is maintained. When the headrest main body 1 is moved backward from the state shown in FIG. 6B, the free end portion 32 is guided by the second cam 37 to be disengaged from the holding locking portion 36, and the free end portion 32 is returned to the initial position. Return. That is, the backward movement of the headrest body 1 is restricted again.

When the headrest main body 1 (see FIG. 1) in the used position of the lock spring 28 tries to move backward, the rear movement of the headrest main body 1 is strongly regulated by strongly tightening the support mechanism side shaft member 30. By tightening the support mechanism side shaft member 30 when the headrest main body 1 in the used position tries to move backward, while restricting the backward movement of the headrest main body 1, When an impact force of a predetermined value (for example, 882N) or more is applied to the rear, there may be a case where the support mechanism side shaft member 30 is configured to slip with respect to the lock spring 28. When the latter configuration is adopted, the impact applied from the headrest main body 1 to the user's head can be softened by the damper action and the friction braking action of the lock spring 28.

4. Others The headrests of the first to third embodiments described above all use a four-bar link as a support mechanism for supporting the second member 4 in a state of being movable in the front-rear direction with respect to the first member 3. It was a thing (four-section link type support mechanism). However, this support mechanism is not limited to the above-mentioned four-section link type. In addition, the support mechanism is an arm member that swingably connects the first member 3 and the second member 4, and the arm member causes the second member 4 to swing in the front-rear direction with respect to the first member 3. An example of the structure is such that (a swing arm type support mechanism) or the like.

The swing arm type support mechanism is required, for example, by removing the rear connecting member 6 from the headrest of the first embodiment shown in FIG. 1 so that the front connecting member 5 functions as the above arm member. It can be easily realized by making adjustments. The swing arm type support mechanism includes an upward swing type that moves the upper part of the headrest body 1 back and forth (swings in the front-back direction) around the lower part of the headrest body 1, and a headrest centered on the upper part of the headrest body 1. An example is a downward swing type in which the lower part of the main body 1 is moved back and forth (swings in the front and back direction).

5. Applications The headrest of the present invention described above can be provided in various seats, and its application is not particularly limited, but it is suitable for being provided in the seat back of a seat installed on a moving body such as an automobile. is there.

1 Headrest body 2 Headrest stay 3 1st member 4 2nd member 5 Front connecting member 6 Rear connecting member 7 Rear movement restricting member 8 Rear movement restricting member 9 Forward movement restricting member 10 Operating means 11 Rotating pin 12 Rotating pin 13 Rotating pin 14 Rotating pin 15 Rear urging member 16 Lock plate 17 Unlocking plate 18 Long hole 19 Regulation pin 20 Push button 21 Left and right slide member 22 Left and right slide member urging means 23 Guide hole 24 Contact plate (guide holder) )
25 Slit 26 Vertical position adjustment mechanism 27 Vertical position adjustment locking member 28 Lock spring 29 First member side shaft member 30 Support mechanism side shaft member 31 Fixed end 32 Free end 33 Left and right slide member guide 34 First cam 35 Auxiliary Cam 36 Holding locking part 37 Second cam α ₁ Locking part α ₂ Locked part β ₁ Locking part β ₂ Locked part

Claims

The headrest body that supports the user's head at the top of the seat back,
The first member, which is provided so that it does not move back and forth with respect to the seat back,
The second member fixed to the headrest body and
A support mechanism that supports the second member in a state where it can move back and forth with respect to the first member,
A rear movement restricting member that regulates the rear movement while allowing the front movement of the second member at each usage position from the rearmost position to the frontmost position of the headrest body.
When the headrest body is moved further forward than the frontmost position to the front section outside the usage range, it acts on the rear movement restricting member, and by moving the rear movement restricting member to the rear movement restricting release side, the second member A member that releases restrictions on backward movement and a member that releases restrictions on backward movement,
A front-rear adjustable headrest equipped with a reset mechanism that returns the rear movement restriction release member to the initial position while moving the headrest body backward from the front section outside the range of use to the rearmost position of use.
When the headrest body moves forward from the rearmost position for use and reaches the frontmost position for use, it comes into contact with the first member and regulates the forward movement of the second member.
When an operating force is applied, it acts on the forward movement restricting member to move the forward movement restricting member to the forward movement restricting release side, thereby further providing an operating means for releasing the restriction on the forward movement of the second member. Characterized headrest.
The operating means is assumed to be equipped with a push button that can be pushed in the left-right direction of the headrest body.
When the push button is pushed in the left-right direction, the forward movement restricting member also moves in the left-right direction, and the front movement restricting member comes out of contact with the first member, so that the restriction on the forward movement of the second member is released. The headrest according to claim 1.
The support mechanism
In addition to the first and second members
A front connecting member that connects the front part of the first member and the front part of the second member,
A rear connecting member that connects the rear portion of the first member and the rear portion of the second member, a first member and a front connecting member, a first member and a rear connecting member, a second member and a front connecting member, and a second member. It is a four-bar link composed of four rotating pins that rotatably connect the rear connecting member and the rear connecting member.
The headrest according to claim 1 or 2, wherein the second member moves back and forth with respect to the first member by the four-section link mechanism.
The support mechanism is an arm member that swingably connects the first member and the second member.
The headrest according to claim 1 or 2, wherein the second member swings in the front-rear direction with respect to the first member by the arm member.
A plurality of locking portions α 1 are provided on the first member at a predetermined front-rear pitch.
A lock plate in which a rearward movement restricting member is swingably attached to a second member or a support mechanism, and a locked portion α 2 locked to the locking portion α 1 is provided on the tip side. ,
When trying to move the headrest body in the used position forward, the locked portion α 2 that was locked backward with respect to the locking portion α 1 of one of the plurality of locking portions α 1 By separating forward from the one locking portion α 1 , the forward movement of the second member is allowed.
When the headrest main body in the used position is to be moved backward, the locked portion α 2 is locked backward with respect to the locking portion α 1 of one of the plurality of locking portions α 1. The headrest according to any one of claims 1 to 4, wherein the backward movement of the second member is restricted.
The rearward movement restricting member is a lock spring that is externally fitted to the first member side shaft member provided on the first member and the support mechanism side shaft member provided on the support mechanism in a tightened state.
When the headrest body in the used position is to be moved forward, the lock spring loosens with respect to the support mechanism side shaft member, so that the forward movement of the second member is permitted.
Claims 1 to 1 in which, when the headrest main body in the used position is to be moved backward, the lock spring tightens the support mechanism side shaft member so that the backward movement of the second member is strongly regulated. 4 Headrest described in any.
The rearward movement restricting member is a lock spring that is externally fitted to the first member side shaft member provided on the first member and the support mechanism side shaft member provided on the support mechanism in a tightened state.
When the headrest body in the used position is to be moved forward, the lock spring loosens with respect to the support mechanism side shaft member, so that the second member is allowed to move forward.
When trying to move the headrest body in the used position backward, the lock spring tightens the support mechanism side shaft member to regulate the backward movement of the second member, but an impact force of a predetermined value or more is applied to the rear. The headrest according to any one of claims 1 to 4, wherein the support mechanism side shaft member slips against the lock spring so that the headrest main body moves rearward while absorbing the impact.
A pair of left and right headrest stays that are inserted so that they can be raised and lowered with respect to the upper part of the seat back,
Further equipped with a vertical position adjustment mechanism for adjusting the vertical position of the headrest body,
Vertical position adjustment mechanism, locked portion beta 2 to be locked to one of the locking portion beta 1 of the plurality of engaging portions beta 1 provided with a predetermined vertical pitch on the outer peripheral portion of at least one of the headrest stays Locking member for vertical position adjustment
It has a guide holder that is fixed to the first member and guides the locking member for vertical position adjustment while sliding in a direction substantially perpendicular to the headrest stay.
When the operating means is operated, the forward movement restricting member moves to the forward movement restricting release side, and the contacted portion provided on the vertical position adjusting locking member is pushed to lock the locking portion β 1 and the locked portion β. The headrest according to any one of claims 1 to 7, wherein the headrest is moved in a series to the side where the lock with 2 is released.