JP6579535B1 - Headrest - Google Patents

Abstract

To prevent the restriction of rearward movement of a headrest body in the range of use from being released without permission. SOLUTION: Support mechanisms 5 and 6 for supporting a headrest in a state in which a second member 4 can be moved back and forth with respect to a first member 3, and allowing the second member 4 to move forward at each use position. When the rearward movement restricting member 7 for restricting rearward movement and the headrest body 1 are moved to the front section outside the use range further forward than the use frontmost position, the rearward movement restricting member 7 is moved to the rearward movement restriction releasing side. A front-rear adjustment type provided with a rear movement restriction release member 8 and when the headrest main body 1 moves forward to reach the foremost position in use, it abuts against the first member 3 and restricts forward movement of the second member 4. The forward movement restriction member 9 and the operation means 10 for moving the forward movement restriction member 9 to the forward movement restriction release side are further provided. [Selection] Figure 1

Description

  The present invention relates to a longitudinally adjustable headrest that can adjust the longitudinal position of a headrest body that supports a user's head.

  As a headrest provided in the upper part of a seat back of an automobile or the like, a front / rear adjustable type that can adjust a front / rear position of a head receiving part (headrest main body) that supports a user's head is known. The front / rear adjustable headrest moves the headrest body forward from the last position of use (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 in the range of use is one-way only for forward movement. That is, the headrest body in the use range can be moved forward, but cannot be moved backward. To move the headrest body backward, move the headrest body to the front section outside the use range further forward than the frontmost position in use (the frontmost position in the use range; the same applies hereinafter). It is necessary to release the restriction by a member (rear movement restriction member) that has restricted the backward movement of the headrest body at a certain time. A longitudinally adjustable headrest having such a structure is described in Patent Document 1, for example.

Japanese Patent No. 5902847

  However, in the headrest of Patent Document 1, the range of use (in this document, the range from the “initial position” shown in FIG. 3A to the “front adjustment limit position” shown in FIG. 3B). If a forward force is continuously applied to a certain headrest body, the headrest body exceeds the forefront position (in the same document, “front adjustment limit position” shown in FIG. Then, in addition to moving from the “front adjustment limit position” shown in FIG. 3B to the “front rotation limit position” shown in FIG. When the headrest body moves forward to the front section outside the use range, the backward movement restriction by the backward movement restriction member ("Lock Plate 60" shown in FIG. 3 in the same document) is automatically released. It was.

  For this reason, in the headrest of Patent Document 1, if a frontal collision accident occurs when the headrest body is in the use range, the headrest body moves forward from the use range to the front section outside the use range by the inertial force, and the rear of the headrest body The head restraint body that has started to move backward (shake back) due to the reaction after the restriction of movement has been released can move backward to the last position in use (the “initial position” shown in FIG. 3A in the same document). There is a possibility that the head of the user who is swung back like the headrest body cannot be sufficiently supported by the headrest body at the front position.

  In this regard, in the conventional front and rear adjustable headrest having a structure like 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. And measures to narrow the range of use of the headrest body (to shorten the distance from the last use position to the frontmost use position). However, the former measure has a drawback that a large operating force is required to adjust the use position of the headrest body. Further, the latter measure has a drawback that the adjustment allowance for the use position of the headrest body is narrowed.

  The present invention has been made in order to solve the above-described problem, and even when a forward collision accident occurs, the rearward movement restriction of the headrest body in the range of use is prevented from being released without permission. The headrest which can support the user's head by the headrest main body in a front position is provided. It is another object of the present invention to provide a headrest that does not require an increase in operating force required for adjusting the position of the headrest body or sacrifice of adjustment for the use position of the headrest body.

The above issues
A headrest body that supports the user's head at the top of the seat back;
A first member provided in a state where it does not move back and forth with respect to the seat back;
A second member fixed to the headrest body;
A support mechanism that supports the second member in a state in which the second member can be moved back and forth with respect to the first member;
A rearward movement restricting member that restricts rearward movement while allowing forward movement of the second member at each use position from the last position of use to the foremost use position,
When the headrest body is moved to the front section outside the use range further forward than the use frontmost position, it acts on the rear movement restriction member and moves the rear movement restriction member to the rear movement restriction release side, thereby A backward movement restriction releasing member for releasing the restriction of backward movement;
A front-rear adjustable headrest comprising a reset mechanism for returning the rearward movement restriction releasing member to the initial position while moving the headrest main body backward from the front section outside the use range to the end position of use,
When the headrest main body moves forward from the use rearmost position to the use frontmost position, the headrest main body comes into contact with the first member (including a case where the headrest main body comes into contact with a member that does not move in the front-rear direction with respect to the first member). A forward movement restricting member for restricting the forward movement of the two members;
An operating means for releasing the restriction of the forward movement of the second member by acting on the forward movement restricting member when the operation force is applied and moving the forward movement restricting member to the forward movement restriction releasing side; It is solved by providing a featured headrest.

  Here, “restriction” in “restricting rearward movement” is only when, for example, when hard metal parts are in contact with each other, the part is firmly restricted without moving from the contacted part. In addition, a case where a part having a certain degree of elasticity comes into contact, and the like is restricted to non-rigid (elastic) in a state where it can move somewhat from the place of contact, is included.

  As described above, when the headrest body moves forward to the forefront position, the forward movement restricting member abuts on the first member to restrict the forward movement of the second member, and the operation means is operated. Unless the restriction of the forward movement of the second member by the forward movement restricting member is not released, even if a forward collision accident occurs and a forward inertial force occurs in the headrest body, It is possible to prevent a certain headrest body from moving beyond the forefront position to a front section outside the use range (a section in which the state where the rearward movement of the second member by the rearward movement restricting member is restricted) is released. For this reason, the restriction | limiting of the back movement of the headrest main body in a use range can be prevented from canceling | releasing arbitrarily. Therefore, it is possible to support the user's head that is rocked back by a forward collision accident with at least the headrest body that is in the forward-most position of use.

  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 operation means include those provided with push buttons, levers, and the like. However, in the front-rear adjustable headrest, a rear biasing member that biases the headrest body backward is usually provided so that the headrest body does not rattle. In many cases, the push button or the lever must be operated against the urging force of the rear urging member. Since the rear urging member is for urging the headrest body or the like having a certain amount of weight, the urging force is set relatively strong. For this reason, when an attempt is made to operate the push button or lever against the rear biasing member, it is necessary to apply a large operating force to the push button or lever.

  In this respect, the lever can be set with a longer length, and the lever principle can be made easier to operate, so that it can be operated with a small operating force. However, the push button is difficult to apply. For this reason, the push button tends to be avoided as an operation means in the headrest, and the lever tends to be preferred. However, the lever has a drawback that an unintended operation force is easily applied, a disadvantage that the operation is troublesome, and a place where the lever is provided is easily limited.

  As described above, both the case where the push button is employed as the operation means and the case where the lever is employed have drawbacks. However, these disadvantages can be solved 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. It is a structure that the restriction | limiting of the forward movement of a 2nd member is cancelled | released because contact | abutting of a limitation member remove | deviates. Thereby, operation of a pushbutton (operation 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 front movement restricting member. This is because only the forward movement restricting member can be directly moved by operating the button. Accordingly, it is possible to operate with extremely small operation force while adopting a push button that is easily operated with a fingertip or the like as an operation means in the headrest.

  In the headrest of the present invention, the specific structure of the support mechanism is not particularly limited as long as the support mechanism can support the second member in a state in which the second member can be moved back and forth. As the structure of the support mechanism, there are mainly the following two types.

First,
Support mechanism,
In addition to the first member and the second member,
A front connection member that connects the front part of the first member and the front part of the second member;
A rear connecting member that connects a rear portion of the first member and a 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. And a four-joint link composed of four pivot pins that pivotably connect the rear connecting member.
The second member moves forward and backward with respect to the first member by the four-bar linkage mechanism.
Hereinafter, a support mechanism having this structure may be referred to as a “four-bar link type support mechanism”.

next,
The support mechanism is an arm member that connects the first member and the second member so as to be swingable,
The second member is structured to swing in the front-rear direction with respect to the first member by the arm member.
Hereinafter, a support mechanism having this structure may be referred to as a “swinging arm type support mechanism”. As a swing arm type support mechanism, there is an upward swing type that moves the upper part of the headrest body back and forth (swings back and forth) around the lower part of the headrest body, and the lower part of the headrest body around the upper part of the headrest body There is a downward swing type that moves the back and forth (swings back and forth).

  In the headrest of the present invention, the specific structure of the backward movement restricting member is not particularly limited as long as the backward movement restricting member restricts the backward movement while allowing the second member to move forward at each use position of the headrest body. As the structure of the backward movement restricting member, there are mainly the following two types.

First,
First member, a plurality of the locking portions alpha ₁ at a predetermined longitudinal pitch,
Backward movement restricting member, pivotally attached to with respect to the second member or the support mechanism, and a lock plate engaging portion alpha ₂ which is engaged with the engaging portion alpha ₁ is provided on the distal end side,
When the headrest body in the use position is moved forward, the locked portion α _{2 that} is locked backward with respect to one locking portion α ₁ among the plurality of locking portions α ₁ is by away forward from the locking part alpha ₁ of the one, a state in which 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 Thus, the second member has a structure in which the backward movement is restricted.
Hereinafter, the rearward movement restricting member having this structure may be referred to as a “lock plate type rearward movement restricting member”.

next,
The rear movement restricting member is a lock spring that is externally fitted in a tightened state with respect to the first member side shaft member provided on the first member and the support mechanism side shaft member provided on the support mechanism,
When trying to move the headrest body in the use position forward, the forward movement of the second member is allowed because the lock spring is loosened relative to the support mechanism side shaft member,
When the headrest body in the use position is moved backward, the lock spring is configured to restrict the backward movement of the second member by tightening the support mechanism side shaft member.
Hereinafter, the rearward movement restricting member having this structure may be referred to as a “lock spring type rearward movement restricting member”.

As a lock spring type rear movement restricting member,
When trying to move the headrest body in the use position backward, the lock spring tightens the support mechanism side shaft member so that the backward movement of the second member is firmly restricted. ,
When the headrest body in the use position is moved backward, the lock spring tightens the support mechanism side shaft member to restrict the rearward movement of the second member, but the rearward impact exceeds a predetermined value (for example, 882 N). When a force is applied, the first member side shaft member slips with respect to the lock spring, so that the headrest main body moves backward while absorbing the impact, such as a “buffer regulation type” type. .
The buffer regulation type has the advantage that the impact applied to the user's head from the headrest body when the headrest body receives the user's head can be mitigated by the damper action and friction brake action of the lock spring. is doing.

In the headrest of the present invention,
A pair of left and right headrest stays inserted in a state that can be raised and lowered relative to the upper part of the seat back;
In addition to having a vertical position adjustment mechanism for adjusting the vertical position of the headrest body,
The vertical position adjusting mechanism is a locked portion β _{2 that} is locked to _one locking portion β ₁ among a plurality of locking portions β ₁ provided at a predetermined vertical pitch on the outer peripheral portion of at least one headrest stay. A vertical position adjusting locking member,
A guide holder fixed to the first member and guiding the vertical position adjusting locking member while sliding it in a direction substantially perpendicular to the headrest stay;
By operating the operating means, the forward movement restricting member moves forward movement restriction releasing side, the vertical position adjusting locking member is also abutted portion is pushed provided therewith locking portion beta ₁ and the locked portion beta It is also preferable to move in a series to the side where the engagement with ₂ is released.
As a result, it is possible to consolidate the operation means in the headrest and simplify the mechanism and operation method of the headrest.

  As described above, according to the present invention, even when a forward collision accident occurs, the headrest of the user to be shaken back is prevented from being lifted by the restriction of the rearward movement of the headrest body in the use range. It becomes possible to provide a headrest that can be supported in a forward position by the main body. For this reason, it is not necessary to increase the operating force required for adjusting the position of the headrest body or sacrifice the adjustment cost for the use position of the headrest body.

In the headrest of a 1st embodiment, it is a sectional view showing signs that a headrest main part is moved ahead from (a) use last position to (c) use frontmost position to (c) use range outside front section, respectively. In the headrest of the first embodiment, (a) a state in which the forward movement of the headrest body is restricted and (b) a state in which the restriction on the forward movement of the headrest body is released. In the headrest of 2nd embodiment, it is sectional drawing which each showed a mode that a headrest main body is moved forward from (a) use last position to (c) use frontmost position to (c) use range front section. In the headrest of the second embodiment, (a) a state in which forward movement and vertical movement of the headrest main body are restricted, (b) a state in which restriction on forward movement and vertical movement of the headrest main body is released, and (c) the headrest It is sectional drawing which each showed the state which moved the main body forward to the front area outside a use range. In the headrest of 3rd embodiment, it is sectional drawing which cut | disconnected and showed the lock spring used as a back movement control member by the plane containing the centerline. It is a figure explaining operation | movement of the free end part of a lock spring in the headrest of a 3rd 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 by taking 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 changed as appropriate without departing from the spirit of the present invention.

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

  As shown in FIG. 1, the headrest of the first embodiment includes a headrest body 1, a second member 4 fixed to the headrest body 1, a headrest stay 2, a first member 3, a front connection member 5, and a rear connection. A member 6, a backward movement restriction member 7, a backward movement restriction release member 8, a forward movement restriction member 9, an operation means 10, and the like are provided.

  The headrest main body 1 serves to support the head of a person (user) seated in the seat from behind, and is attached to the upper portion of the headrest stay 2. The headrest stay 2 is arranged on the upper part of the seat back of a seat not shown. The headrest stay 2 is inserted into a stay holder (not shown) provided on the upper portion 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. In the headrest of the first embodiment, the first member 3 is fixed to the upper portion 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 so as not to move with respect to the headrest body 1 (in the headrest of the first embodiment, the case inner surface of the headrest body 1).

  The front connecting member 5 and the rear connecting member 6 connect the second member 4 to the first member 3 in a state in which the second member 4 can be moved back and forth. The lower part of the front connection member 5 is connected to the front part of the first member 3 through a rotation pin 11 in a rotatable state, and the upper part of the front connection member 5 is connected to the front of the second member 4. It is connected with the part through the rotation pin 12 in a rotatable state. A rear biasing member 15 that biases the headrest body 1 rearward by biasing the second member 4 and the front connection member 5 is provided in the vicinity of the rotation pin 12. On the other hand, the lower part of the rear connection member 6 is connected to the rear part of the first member 3 through a rotation pin 13 in a rotatable state, and the upper part of the rear connection member 6 is a second member. It is connected with the rear part of 4 via the pin 14 for rotation so that rotation is possible.

  In addition to the first member 3 and the second member 4, the front connection member 5, the rear connection member 6, and the four rotation pins 11, 12, 13, and 14 constitute a four-bar link. By this four-bar link, the second member 4 and the headrest body 1 to which the second member 4 is fixed are supported in a state in which the second member 4 can move back and forth with respect to the first member 3.

The rearward movement restricting member 7 moves the second member 4 forward at each use position from the headrest main body 1 to the frontmost use position shown in FIG. 1B from the last use position shown in FIG. The rearward movement is restricted while allowing the movement. In the headrest of the first embodiment, the rearward movement restricting member 7 is a plate-like member (lock plate 16) attached to the front connecting member 5 so as to be swingable. The distal end side of the lock plate 16 (rearward movement restricting member 7) (oscillation end side) has a locked portion alpha ₂ for locking the locking portion alpha ₁ of the first member 3. The lock plate 16 is normally by an urging member not shown (lock biasing member), and a state in which the locking direction is always urged (locked portion alpha ₂ is the direction to engage the engaging portion alpha ₁₎ It has become.

The addition of forward operating force to the headrest body 1 in the use position, away locked part alpha ₂ that has been locked in backward for a locking portion alpha ₁ is from the locking portion alpha ₁ forward and, by overcoming the convex portion in front of the locking portion alpha _1, so locked to the preceding engaging portion alpha _1. Thus, when the headrest body 1 is at the use position, the headrest body 1 is allowed to move forward. In contrast, the addition of rearward operating force to the headrest body 1 in the use position, to further strongly abuts rearwardly against the locking portion alpha ₁ engaged portion alpha ₂ is locked at the time become. For this reason, when the headrest body 1 is in the use position, the backward movement of the headrest body 1 is restricted.

  The rearward movement restriction release member 8 acts on the rearward movement restriction member 7 when the headrest body 1 is moved from the front-most use position shown in FIG. 1B to the front section outside the use range shown in FIG. Then, the lock plate 16 (rear movement restriction 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 rear movement restriction release member 8 is not particularly limited in its specific structure as long as it exhibits the above function. In the headrest of the first embodiment, the rearward movement restriction release member 8 is a plate-like member (lock release plate 17) attached to the front portion of the first member 3. The lock release plate 17 is supported in a swingable (turnable) manner around the rotation pin 11 with respect to the first member 3, and the lock restricting member 150 in FIG. The same operation as the lock switching member 70 in FIG. 3 of Japanese Patent No. 5902847 is performed.

  That is, one side surface of the lock release plate 17 is in contact with one side surface of the front connection member 5, and the front connection member 5 rotates about the rotation pin 11 (relative to the first member 3). ), The unlocking plate 17 also rotates together with the front connecting member 5 (integrally rotating forward or backward) by the frictional force acting between the unlocking plate 17 and the front connecting member 5. However, the regulation pin 19 fixed to the first member 3 is in contact with the end of the arc-shaped (arc-shaped around the rotation pin 11) long hole 18 provided in the unlocking plate 17. When it comes into contact, the forward or backward rotation of the lock release plate 17 is restricted, and the front connecting member 5 rotates forward or backward with the lock release plate 17 left.

  In the headrest according to the first embodiment, the restriction pin 19 and the long hole 18 are arranged so that the headrest body 1 is moved forward from the use frontmost position (FIG. 1B) to the front section outside the use range (FIG. 1C). While moving, not only functions as a mechanism (rear movement restriction release mechanism) for releasing the restriction of the backward movement of the headrest body 1 by the lock plate 16 (rear movement restriction member 7), but also moves the headrest body 1 forward out of the range of use. While moving backward from the section to the last position of use, it also functions as a mechanism (reset mechanism) that causes the restriction of the backward movement of the headrest body 1 by the lock plate 16 (rearward movement restriction member 7) again. .

  The forward movement restricting member 9 abuts against the first member 3 when the headrest body 1 moves forward from the last use position in FIG. 1A and reaches the use frontmost position in FIG. The forward movement of the second member 4 is restricted. When the forward movement of the second member 4 is restricted, the forward movement of the headrest body 1 integrated therewith is also restricted. The forward movement restricting member 9 is not particularly limited in its specific structure as long as it exhibits the above function. In the headrest of the first embodiment, the forward movement restricting member 9 is a plate-like member attached to the rear part of the second member 4 in a rearward direction. Although the forward movement restricting member 9 can move in the left-right direction with respect to the second member 4, it 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 moved forward from the use frontmost position in FIG. 1 (b) to the forward section outside the use range in FIG. Unless the restriction on the forward movement of the headrest main body 1 (second member 4) is released, the headrest main body 1 cannot be moved forward, and the restriction on the backward movement of the headrest main body 1 by the lock plate 16 can be released. I can't do it. For this reason, even if a forward collision accident occurs and a forward inertial force is generated in the headrest body 1, the restriction of the rearward movement of the headrest body 1 in the use range is not released without permission. It is possible to support the user's head that is shaken back by a collision accident with the headrest body 1 at least in the forefront position.

  The operating means 10 is a part where a user or the like applies an operating force in order to release the restriction of the forward movement of the headrest body 1 by the forward movement restricting member 9. In the headrest of the first embodiment, the operation means 10 is a push button 20 that can be pushed in the left-right direction of the headrest body 1. When the push button 20 is pushed into the state shown in FIG. 2A from the state shown in FIG. 2A, 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 that is fixed in place is pushed inward, and the forward movement restricting member 9 and the first member 3 are shifted in the left-right direction. The restriction of forward movement is released.

The left and right slide member 21 is constantly urged toward the push button 20 by the left and right slide member urging means 22. Therefore, when the hand is released from the push button 20, the left / right slide member 21 automatically returns to the initial position in FIG. 2A, and the push button 20 is also pushed outward by the left / right slide member 21 to the initial position. It comes to return automatically. Although the form of the left-right slide member 21 is not particularly limited, in the headrest of the first embodiment, a single steel wire is bent into a “U” shape. The left / right slide member 21 can be moved only in the left / right direction by being inserted into a guide hole 23 formed in the partition wall of the case of the second member 4 or the headrest body 1.

2. Next, the headrest of the second embodiment will be described. About the headrest of a 2nd embodiment, a different part from the headrest of a 1st embodiment is mainly demonstrated, and description of the part which has the operation | movement and a function in common with the headrest of a 1st embodiment is abbreviate | omitted as much as possible. About the structure which is not mentioned especially in the headrest of 2nd embodiment, the structure similar to what was described by description of the headrest of 1st embodiment is employable.

  FIG. 3 shows a state in which the headrest body 1 is moved forward from (a) the rearmost position of use to (c) the frontmost position of use (c) to the front section outside the use range in the headrest of the second embodiment. It is sectional drawing. The sectional view of FIG. 3 shows the headrest body 1 cut along a plane perpendicular to the left-right direction. FIG. 4 shows a state in which the headrest body 1 is prevented from moving forward and vertically and (b) the headrest body 1 is restrained from moving forward and vertically in the headrest of the second embodiment. And (c) is a cross-sectional view showing a state in which the headrest body 1 is moved forward to the front section outside the use range. The cross-sectional view of FIG. 4 shows the headrest body 1 cut along a plane perpendicular to the vertical direction, and shows the left half of the headrest body 1.

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

  Moreover, in the headrest of the first embodiment, the left and right slide member 21 can move in the left and right direction with respect to the headrest body 1, but the relative vertical position of the left and right slide member 21 with respect to the headrest body 1 does not change. It was. On the other hand, in the headrest of the second embodiment, the left / right slide member 21 moves in the left / right direction with respect to the headrest body 1 as shown in FIG. 4, and further, as shown in FIG. The relative vertical position of the left and right slide member 21 with respect to the structure is also changed. That is, the vertical position of the left and right slide member 21 with respect to the headrest stay 2 remains constant, and the first member 3, the second member 4, the front connection member 5, the rear connection member 6, and the four rotation pins 11, 12, The relative vertical position of the left and right slide member 21 with respect to the headrest body 1 is changed by the operation of the four-bar link composed of 13 and 14. As with the headrest of the first embodiment, the left / right slide member 21 has a form in which one steel wire is bent into a “U” shape. When vertically moving, one of the rod-like portions is guided in the vertical direction by a vertical guide groove provided in the left and right slide member guide 33. For this reason, when the headrest body 1 is in the rearmost position of use in FIG. 3A, the front movement restricting member 9 fixed to the rear part of the left and right slide member 21 is located near the inner bottom of the headrest body 1. When the main body 1 is moved forward, the front movement restricting member 9 relatively moves upward in the headrest main body 1 while moving forward together with the headrest main body 1.

  When the headrest body 1 continues to move forward and the headrest body 1 reaches the foremost position in FIG. 3B, the forward movement restricting member 9 fixed to the rear part of the left and right slide members 21 is moved to the contact plate 24. Abut. 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 front movement restricting member 9 contacts the contact plate 24, the headrest body 1 is restricted from moving forward. It will be in the state.

  Thereby, similarly to the headrest of the first embodiment, in the headrest of the second embodiment, the headrest body 1 is moved forward from the frontmost use position in FIG. 3B to the front section outside the use range in FIG. Even if it is going to be made, unless the restriction | limiting of the forward movement of the headrest main body 1 by the front movement control member 9 is cancelled | released, the headrest main body 1 cannot be moved forward, but restriction | limiting of the rearward movement of the headrest main body 1 by the lock plate 16 is carried out. It cannot be canceled.

  In the headrest of the second embodiment, when the push button 20 is pushed into the back side, the left / right slide member 21 and the front movement restricting member 9 are pushed into the back side, and the front movement restricting member 9 and the first member 3 are left / right. The point which will be in the state shifted | deviated to the direction and the restriction | limiting of the forward movement of the 1st member 3 by the forward movement control member 9 is cancelled | released is the same as that of the headrest of the first embodiment. 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 formed in the slit 25 provided in the contact plate 24. It moves to the overlapping position. When the headrest 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.

  Moreover, in the headrest of the first embodiment, when the push button 20 is pushed in, only the forward movement restriction of the headrest body 1 by the forward movement restriction member 9 is released. On the other hand, in the headrest of the second embodiment, when the push button 20 is pushed, not only the forward movement restriction member 9 restricts the forward movement of the headrest body 1 but also the vertical direction of the headrest body 1 by the vertical position adjustment mechanism 26. The movement restrictions are also released in a series.

That is, when you do not push the push button 20, as shown in FIG. 4 (a), with respect to the locking portion beta ₁ provided on an outer peripheral portion of the headrest stay 2, the upper and lower position adjusting locking member 27 locking portion beta ₂ is engaged, when in a state that can not be moved in the vertical direction headrest body 1 with respect to the headrest stay 2, pushed the push button 20, as shown in FIG. 4 (b), forward The movement restricting member 9 slides to the back side and the restriction on the forward movement of the headrest body 1 is released, and the vertical position adjusting locking member 27 is also pushed by the left and right slide member 21 to move to the back side. to, locking the locked part beta ₂ with respect to the locking portion beta ₁ is released, so that it is possible to move the headrest body 1 in the vertical direction. In the headrest of the second embodiment, the vertical position adjusting locking member 27 is accommodated in a contact plate 24 formed in a groove shape as shown in FIG. Guided in the left-right direction. That is, the abutment plate 24 is not only a part for abutting the forward movement restricting member 9 but also a guide for guiding the vertical position adjusting locking member 27 while sliding the headrest stay 2 in a direction substantially perpendicular to the headrest stay 2. It is a part that also functions as a holder. However, as long as the guide holder is fixed to the first member 3, the guide holder may be formed of a member different from the contact plate 24.

Engaged on the outer peripheral portion of the headrest stay 2, including those shown in Figure 4, a plurality of engaging portions beta ₁ is provided at a predetermined vertical pitch, the locked portion beta ₂ is locked by switching the stop unit beta _1, thereby making it possible to adjust the height of the headrest body 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 need only be provided on at least one of the headrest stay 2 sides.

3. Next, the headrest of the third embodiment will be described. Regarding the headrest of the third embodiment, mainly the parts different from the headrest of the first embodiment and the second embodiment will be described, and the operations and functions common to the headrest of the first embodiment and the second embodiment will be described. The description is omitted as much as possible. About the structure which is not mentioned especially in the headrest of 3rd embodiment, the structure similar to what was described by description of the headrest of 1st embodiment or 2nd embodiment is employable.

  In the headrest of the first embodiment and the second embodiment described above, the lock plate 16 is used as the rearward movement restricting member 7 as shown in FIG. 1 or FIG. On the other hand, in the headrest of the third embodiment, the lock spring 28 shown in FIG. FIG. 5 is a cross-sectional view showing the lock spring 28 used as the backward movement restricting member 7 cut along 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 in a tightened state to the first member side shaft member 29 and the support mechanism side shaft member 30 that are coaxially arranged on the center line L. 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 that is 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 side connecting member 5. The lock spring 28 performs the same operation as the coil spring 5 in FIG. 3 of Japanese Patent No. 5654177.

  That is, when the headrest body 1 is moved forward, the lock spring 28 is loosened with respect to the support mechanism side shaft member 30, and thus the headrest body 1 is allowed to move forward, but the headrest body 1 When the head is moved rearward, the lock spring 28 is in a state of tightening the support mechanism side shaft member 30, so that the rearward movement of the headrest body 1 is restricted. However, when the headrest body 1 is moved to the front section outside the use range, a member corresponding to the rearward movement restriction release member 8 (see FIG. 1) comes into contact with the free end 32 of the lock spring 28, and When the free end portion 32 is pressed in a direction in which the lock spring 28 is loosened, 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 is like that.

  For reference, FIG. 6 shows the operation of the free end 32 of the lock spring 28. 6A shows a state where the headrest body 1 is in the use position, and FIG. 6B shows that the headrest body 1 moves to the front section outside the use range, and the restriction on the rearward movement of the headrest body 1 is released. FIG. 6C shows a state in which the headrest body 1 is moved backward from the state shown in FIG. 6B, and the backward movement of the headrest body 1 is restricted again. When the headrest main body 1 moves forward from the state shown in FIG. 6A, the free end 32 of the lock spring 28 is pressed in the loosening direction by the first cam 34, of which, as shown in FIG. 6B. As described above, the auxiliary cam 35 engages the free end portion 32 with the holding engagement portion 36, and the lock spring 28 is held in a relaxed state. That is, the state where the restriction on the rearward movement of the headrest body 1 is released is maintained. When the headrest body 1 is moved rearward from the state shown in FIG. 6B, the free end 32 is removed from the holding locking portion 36 by being guided by the second cam 37, and the free end 32 is brought 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 use position is about to move backward, the lock spring 28 strongly tightens the support mechanism side shaft member 30 so that the rearward movement of the headrest main body 1 is firmly regulated. When the headrest body 1 in the use position is configured to move backward, and when the headrest body 1 is tightened, the support mechanism side shaft member 30 is tightened to regulate the backward movement of the headrest body 1. Any of the cases where the support mechanism side shaft member 30 is configured to slip with respect to the lock spring 28 when an impact force of a predetermined value (for example, 882 N) or more is applied to the rear side can occur. When the latter configuration is employed, the impact applied to the user's head from the headrest body 1 can be reduced by the damper action and friction brake action of the lock spring 28.

4). Others The headrest from the first embodiment to the third embodiment described above uses a four-bar link as a support mechanism that supports the second member 4 in a state in which the second member 4 can be moved in the front-rear direction with respect to the first member 3. Thing (four-bar link type support mechanism). However, this support mechanism is not limited to the four-bar link type described above. In addition, as a support mechanism, it is an arm member that connects the first member 3 and the second member 4 so as to be swingable, and the second member 4 swings back and forth with respect to the first member 3 by the arm member. An example of such a structure (a swing arm type support mechanism) is exemplified.

For example, the swing arm type support mechanism removes the rear connection member 6 from the headrest of the first embodiment shown in FIG. 1 so that the front connection member 5 functions as the above-mentioned arm member, and other necessary functions. It can be easily realized by adjusting. As a swing arm type support mechanism, an upper swing type mechanism that moves the upper part of the headrest body 1 back and forth (swings back and forth) around the lower part of the headrest body 1 and a headrest around the upper part of the headrest body 1 are used. A downward swing type that moves the lower part of the main body 1 back and forth (swings back and forth) can be mentioned.

5). Uses The headrest of the present invention described above can be provided in various seats, and the use thereof is not particularly limited. However, the headrest is suitable for use in a seat back of a seat installed in a moving body such as an automobile. is there.

DESCRIPTION OF SYMBOLS 1 Headrest main body 2 Headrest stay 3 1st member 4 2nd member 5 Front side connection member 6 Rear side connection member 7 Backward movement restriction member 8 Backward movement restriction release member 9 Forward movement restriction member 10 Operation means 11 Pin for rotation 12 Pin for rotation DESCRIPTION OF SYMBOLS 13 Pin for rotation 14 Pin for rotation 15 Back biasing member 16 Lock plate 17 Lock release plate 18 Long hole 19 Restriction pin 20 Push button 21 Left and right slide member 22 Left and right slide member biasing means 23 Guide hole 24 Contact plate (guide holder) )
25 slit 26 vertical position adjusting mechanism 27 vertical position adjusting locking member 28 lock spring 29 first member side shaft member 30 support mechanism side shaft member 31 fixed end portion 32 free end portion 33 left and right slide member guide 34 first cam 35 auxiliary Cam 36 Holding locking portion 37 Second cam α ₁ locking portion α ₂ locked portion β ₁ locking portion β ₂ locked portion

Claims (8)

A headrest body that supports the user's head at the top of the seat back;
A first member provided in a state where it does not move back and forth with respect to the seat back;
A second member fixed to the headrest body;
A support mechanism that supports the second member in a state in which the second member can be moved back and forth with respect to the first member;
A rearward movement restricting member that restricts rearward movement while allowing forward movement of the second member at each use position from the last position of use to the foremost use position,
When the headrest body is moved to the front section outside the use range further forward than the use frontmost position, it acts on the rear movement restriction member and moves the rear movement restriction member to the rear movement restriction release side, thereby A backward movement restriction releasing member for releasing the restriction of backward movement;
A front-rear adjustable headrest comprising a reset mechanism for returning the rearward movement restriction releasing member to the initial position while moving the headrest main body backward from the front section outside the use range to the end position of use,
A forward movement restricting member that abuts against the first member and restricts the forward movement of the second member when the headrest body moves forward from the last position of use and reaches the foremost position of use;
An operating means for releasing the restriction of the forward movement of the second member by acting on the forward movement restricting member when the operation force is applied and moving the forward movement restricting member to the forward movement restriction releasing side; Characteristic headrest.
The operating means includes a push button that can be pushed in the left and 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, so that the forward movement restricting member abuts on the first member so that the restriction on the forward movement of the second member is released. The headrest according to claim 1.
Support mechanism is
In addition to the first member and the second member,
A front connection member that connects the front part of the first member and the front part of the second member;
A rear connecting member that connects a rear portion of the first member and a 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. And a four-joint link composed of four pivot pins that pivotably connect 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-bar linkage mechanism.
The support mechanism is an arm member that connects the first member and the second member so as to be swingable,
The headrest according to claim 1, wherein the second member swings in the front-rear direction with respect to the first member by the arm member.
First member, a plurality of engaging portions alpha ₁ is provided at a predetermined longitudinal pitch,
Rearward movement restricting member is swingably attached to with respect to the second member or the support mechanism, locked portion alpha ₂ which is engaged with the engaging portion alpha ₁ is a lock plate provided on the distal end side ,
When the headrest body in the use position is moved forward, the locked portion α _{2 that} is locked backward with respect to one locking portion α ₁ among the plurality of locking portions α ₁ is by away forward from the locking part alpha ₁ of the one, 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 headrest according to claim 1, wherein rearward movement of the second member is restricted.
The rear movement restricting member is a lock spring that is externally fitted in a tightened state with respect to the first member side shaft member provided on the first member and the support mechanism side shaft member provided on the support mechanism,
When trying to move the headrest body in the use position forward, the lock spring is loosened with respect to the support mechanism side shaft member, and the second member is allowed to move forward,
When the headrest body at the use position is moved backward, the lock spring tightens the support mechanism side shaft member so that the backward movement of the second member is firmly regulated. 4. A headrest according to any one of the above.
The rear movement restricting member is a lock spring that is externally fitted in a tightened state with respect to the first member side shaft member provided on the first member and the support mechanism side shaft member provided on the support mechanism,
When trying to move the headrest body in the use position forward, the forward movement of the second member is allowed because the lock spring is loosened relative to the support mechanism side shaft member,
When trying to move the headrest body in the use position rearward, the lock spring tightens the support mechanism side shaft member, but the rearward movement of the second member is restricted, 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 when the support mechanism side shaft member slips with respect to the lock spring, the headrest body moves backward while absorbing the impact.
A pair of left and right headrest stays inserted in a state that can be raised and lowered relative to the upper part of the seat back;
A vertical position adjustment mechanism for adjusting the vertical position of the headrest body,
The vertical position adjusting mechanism is a locked portion β _{2 that} is locked to _one locking portion β ₁ among a plurality of locking portions β ₁ provided at a predetermined vertical pitch on the outer peripheral portion of at least one headrest stay. A vertical position adjusting locking member,
A guide holder fixed to the first member and guiding the vertical position adjusting locking member while sliding it in a direction substantially perpendicular to the headrest stay;
By operating the operating means, the forward movement restricting member moves forward movement restriction releasing side, the vertical position adjusting locking member is also abutted portion is pushed provided therewith locking portion beta ₁ and the locked portion beta The headrest according to any one of claims 1 to 7, wherein the headrest is moved in a series toward a side where the engagement with ₂ is released.

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