JP6148777B1 - Headrest - Google Patents

Abstract

An object of the present invention is to provide a 180-degree foldable headrest capable of reducing the front and rear thickness. A headrest includes a rotating bracket, a headrest frame, a main shaft, a fixed bracket, a rotating bracket biasing spring, a lock pin, a lock pin biasing spring, and a lock releasing member. When the locking portion A4 of the bracket 11 is a bent portion provided at the lower portion of the rear wall portion A1, when the locking portion A4 is in the upper position when in use, the locking portion X1 of the rotating bracket 11 or the fixed bracket 22 and the lock pin 24 are engaged. The forward rotation is restricted when the stop portion C1 is locked, and the backward rotation is restricted when the locking portion B4 of the fixed bracket 22 and the locking portion A4 of the rotating bracket 11 are locked. When the lock pin 24 is moved by operating the release member 26, the locking portion X1 and the locking portion C1 are disengaged and rotated forward by the rotating bracket biasing spring biasing force. It was set to be the front lower position of the time. [Selection] Figure 8

Description

  The present invention relates to a headrest provided on an upper part of a seat back of an automobile or the like.

  Various types of headrests have been proposed as headrests provided on the upper part of seat backs of automobiles and the like. For example, it has a structure that can rotate approximately 180 ° between an upper position during use (position protruding upward from the upper part of the seat back) and a front lower position (position along the front of the seat back) when not in use. A headrest (hereinafter, a headrest having the structure may be referred to as a “180-degree foldable headrest”) has been proposed (see, for example, FIG. 1 of Patent Document 1).

  This 180-degree foldable headrest is often used in the last row of seats in a hatchback type automobile. This is because hatchback type cars generally have a structure that allows the rear storage space (trunk room) to be expanded to a living space (ride space) by folding the last row of seats forward. This is because the last row of seats can be folded compactly if the headrest provided on the last row of seats is of a 180-fold foldable type.

JP 2005-225246 A

  By the way, as described above, the 180-degree foldable headrest provided on the seat that can be folded forward is required to be as thin as possible in the front-rear thickness (thickness in the front-rear direction in use). The This is because when the front / rear thickness of the 180-degree foldable headrest is large, the headrest stored in the front lower position when not in use protrudes forward from the front of the seat back, and the seat is substantially horizontal. It is because it cannot become defeated until it becomes.

  However, in a 180-degree foldable headrest, it is necessary to ensure the strength of a mechanism that rotates from an upper position to a front lower position (hereinafter, this mechanism may be referred to as a “rotation mechanism”). It was very difficult to suppress the thickness before and after. In particular, a headrest frame having a long headrest frame and a tall headrest is likely to be subjected to a large torque in the vicinity of the rotation center of the rotation mechanism, so that it is difficult to suppress the front and rear thickness of the rotation mechanism. For example, in the headrest of the above-mentioned Patent Document 1, as shown in FIG. 5 of the same document, the headrest frame (frame 6) is vertically long and has a tall structure. As shown, since the turning mechanism is complicated and large, the front and rear thickness of the headrest is considered to be thick to some extent. For this reason, in the headrest of patent document 1, the recessed part for accommodating the headrest used as the front front side position was provided in the front surface of the seat back (refer paragraph 0020 of the literature), and the seating comfort of the seat was sacrificed. it is conceivable that.

  Moreover, the headrest of Patent Document 1 has a drawback that it is difficult to have a height-adjustable structure. This is because the headrest of Patent Document 1 has a structure in which a wire (wire means 68) for operating the headrest is connected to the lower central portion of the headrest, as shown in FIG. Because. In other words, in this structure, if the height of the headrest can be adjusted, a space around the wire that becomes stretched or slackened as the headrest moves up and down is provided in the seat back. Where necessary, it is not always easy to provide such a space in the seat back.

  Furthermore, the headrest of Patent Document 1 needs to increase the thickness of each member constituting the rotating mechanism in order to obtain a required strength. For this reason, in addition to being difficult to reduce the weight of the headrest of Patent Document 1, it is necessary to employ special processing such as fine blanking for forming each member, which can improve productivity. It has the disadvantage of being difficult.

  The present invention has been made to solve the above-described problems, and provides a 180-degree foldable headrest capable of reducing the front-rear thickness even when the height is increased. It is also an object of the present invention to provide a 180-degree foldable headrest that can be suitably employed in an aspect of adjusting the height. Further, it is an object of the present invention to reduce the weight and improve the productivity of the 180-degree folding headrest.

The above issues
A foldable headrest having a structure capable of rotating by approximately 180 ° between an upper position when in use and a front lower position when not in use,
A rotating bracket having a rear wall portion A ₁ and a pair of left and right side wall portions A ₂ , A _3, and a locking portion A ₄ provided at the lower portion of the rear wall portion A ₁ ;
A headrest frame having a gate shape having a pair of left and right vertical frame portions and a horizontal frame portion connecting upper portions of the vertical frame portions, and fixed to the rotating bracket;
A spindle that is fixed directly or indirectly to the upper part of the headrest stay or the upper part of the seat back frame, and the pivot bracket is rotatably supported;
A fixing bracket having a rear wall part B ₁ and a pair of left and right side wall parts B ₂ , B ₃ , a locking part B ₄ provided on the upper part of the rear wall part B ₁ , and fixed to the main shaft;
A rotating bracket biasing spring for constantly biasing the rotating bracket toward the front lower position;
A lock pin that is supported so as to be able to move up and down with respect to the side wall portions A ₂ and A _{3 of the} rotating bracket or the side wall portions B ₂ and B _{3 of the} fixed bracket, and has a locking portion C ₁ on a part of its outer peripheral surface;
The lock pin, the locking portion C ₁ is provided in the side wall portion A _2, A ₃ or side wall B _2, B ₃ towards the lock pin of the hinge bracket and the fixed bracket is not supported locking a lock pin urging spring for constantly urging the locking direction to be engaged in section X _1,
A lock release member that the locking pin is that locking portion C ₁ is forcibly moved in the unlocking direction deviating from the locking part X _1,
Consists of
At least one of the locking part A _{4 and the} locking part B ₄ is a bent part provided at the lower part of the rear wall part A ₁ or the upper part of the rear wall part B ₁ ,
When in the upper position when in use,
By the engagement portion C ₁ of the engaging portion X ₁ and the lock pin is locked, even if the force from the rear is applied forward rotation is regulated,
By the engagement portion A ₄ of the engaging portion B ₄ and the rotating bracket fixing bracket is locked, even when a force is applied from the front rearward turning is restricted,
Moving the locking pin in the unlocking direction by operating the unlocking member disengages the locking portion C ₁ of the engaging portion X ₁ and the lock pin, and rotated forward by the biasing force of the biasing spring hinge bracket This can be solved by providing a headrest characterized by having a lower front position when not in use.

  The headrest of the present invention is a 180-fold folding type, and as described above, the front rotation and the rear rotation during use are realized with a simple structure and the member that restricts the front rotation. When the headrest frame is long in the up and down direction by adopting a lock pin that can be turned up and down (if the headrest is tall. For example, the height from the center of rotation of the headrest to the upper end of the headrest is 320 mm, Even when a load of 980 N is applied to the headrest, the front and rear thickness of the headrest can be about 40 mm. Here, “up and down rotation” means that when the lock pin is viewed from the side of the headrest, the lock pin moves up and down along an arcuate path.

Moreover, the headrest of this invention can be suitably employ | adopted also in the aspect which performs height adjustment so that it may mention later. Furthermore, in the headrest of the present invention, the fixing bracket is fixed and integrated with a sufficient length of about 100 mm with respect to the main shaft, and the rotating bracket is connected to the rear wall portion A ₁ and the side wall portions A ₂ and A ₃ . As the groove member having, the fixing bracket is a groove member having the rear wall portion B ₁ and the side wall portions B ₂ and B ₃ , and each of the side wall portions A ₂ and A ₃ or the side wall portions B ₂ and B _3. by providing the engagement portion X ₁ in each of the force from the lock pin applied to the hinge bracket or fixed bracket, between the side wall portion a ₂ and the side wall portion a _3, or side wall B ₂ and the side wall portion etc. can be dispersed in the B _3, even by reducing the plate thickness of each member constituting the rotating mechanism of the headrest, so that it is possible to obtain the necessary strength. Therefore, not only can the weight of the headrest be reduced, but it is also possible to improve the productivity of the headrest, for example, each member can be molded by general pressing.

In the headrest of the present invention,
While positioning the side wall portions A ₂ and A ₃ of the rotating bracket outside the side wall portions B ₂ and B ₃ of the fixed bracket,
Side wall portions A ₂ and A ₃ are disposed in contact with the outer peripheral surface of the vertical frame portion of the headrest frame,
It is preferable to extend the lower end portion of the vertical frame portion of the headrest frame to the vicinity of the main shaft.

  As a result, the rigidity of the rotation side member near the main shaft (near the rotation center of the headrest) can be further increased. Therefore, even if the headrest is tall, it is possible to more suitably employ the rotation mechanism as it can withstand a greater torque while suppressing the thickness in the front-rear direction.

In the headrest of the present invention, the lock pin may be supported on the side wall portions B ₂ and B ₃ of the fixed bracket, and the locking portion X ₁ may be provided on the side wall portions A ₂ and A ₃ of the rotating bracket. Moreover, you may provide only one set of a rotation bracket and a fixed bracket. Furthermore, the fixing bracket may be configured to be indirectly fixed to the headrest stay or the seat back frame via the main shaft.
But,
Supporting the lock pin on the side wall portions A ₂ and A ₃ of the rotating bracket,
An engagement portion _{X 1,} is provided on the side wall _B 2, _{B 3} of the fixed bracket,
The pivot bracket and the fixed bracket are respectively provided on the lower end of the left vertical frame portion and the lower end of the right vertical frame portion in the headrest frame,
The main shaft is inserted into the left and right fixing brackets and welded,
It is preferable to fix the left side fixing bracket and the right side fixing bracket to the upper ends of the respective stays of the pair of left and right headrest stays or the upper part of the seat back frame accommodated in the seat back.

  This is because, when a structure (see the headrest (FIG. 1) of the first embodiment described later) in which the fixing bracket is indirectly fixed to the headrest stay or the seat back frame via the main shaft is employed, the headrest in use. When a force is applied from the front, almost all of the force is finally applied to the joint between the main shaft and the fixed bracket, so that the joint between the main shaft and the fixed bracket is twisted. Where there is a risk of breakage or the like, as described above, when a structure for fixing the fixing bracket directly to the headrest stay or the seat back frame (see the headrest (FIG. 7) of the third embodiment described later) is employed. When a force is applied from the front to the headrest during use, almost all of the force is applied to the headrest stay or the seat back frame. This is because it is possible to receive directly with a fixed bracket that is fixed in order to prevent the main shaft from being twisted and to prevent a large load from being applied to the joint between the main shaft and the fixed bracket. .

Further, when a structure in which only one set of the rotating bracket and the fixed bracket is provided (see the headrest of the first embodiment described later (see FIG. 1)), when force is applied from the rear to the headrest in use, its power, when so received by the engaging portion X ₁ a total of two points in the side wall portion a _2, a ₃ of the hinge bracket, as described above, the hinge bracket and the fixed bracket pair When the structure to be provided (see the headrest of the third embodiment described later (see FIG. 7)) is employed, when a force is applied from the rear to the headrest in use, the force is applied to the left fixing bracket and the right fixing. receiving at each of the side wall portions B _2, B a total of four positions provided at _three engaging portions X ₂ in the bracket, because it becomes possible to secure a more sufficient strength.

  Furthermore, when a structure in which only one set of the pivot bracket and the fixed bracket is provided (see the headrest of the first embodiment described later (see FIG. 1)), when the headrest comes into contact with the main body (the force is applied only to one side in the left-right direction). When, for example, the twisting in the direction in which one of the left and right sides of the headrest body moves forward and the other moves backward occurs, the rotating bracket and the fixing bracket can be attached as described above. Provided in a pair of left and right, each fixing bracket is directly fixed to each left and right headrest stay, and each rotating bracket is directly fixed to each left and right vertical frame portion of the headrest frame (the third to be described later) By adopting the headrest of the embodiment (see FIG. 7), even when it hits the main body of the headrest, To suppress the twist is because it also becomes possible.

As described above, the structure in which the fixing bracket is directly fixed to the headrest stay and the seat back frame and the structure in which the rotating bracket and the fixing bracket are provided in a pair on the left and right have various advantages. Even if it does not make it, the effect that the intensity | strength of a headrest can be raised can be acquired. In this regard, such a structure is simply realized by supporting the lock pin on the side wall portions A ₂ and A ₃ of the movable bracket and providing the locking portion X ₁ on the side wall portions B ₂ and B ₃ of the fixed bracket. can do.

  In the headrest of the present invention, the specific configuration of the unlocking member is not particularly limited. The configuration according to the headrest of the present invention can be employed in either an aspect using a wire (unlocking wire) or an aspect using a lever (unlocking lever) as the unlocking member as described below.

As an aspect using a wire (unlocking wire) as the unlocking member, the following configuration is suitable.
That is,
A pair of left and right headrest stays consisting of a hollow pipe at least one of which is open at the upper end;
A stay holder fixed to the upper part of the seat back and holding the headrest stay in a state where it can be raised and lowered;
Of the pair of left and right headrest stays, a wire fixing member and a wire fixing auxiliary member fixed to the upper end portion of the headrest stay on the side made of a hollow pipe whose upper end portion is opened,
Further comprising
The lock pin has a cam portion C ₂ on the outer circumferential surface of one end,
The unlocking member is
An unlocking wire inserted into the headrest stay consisting of a hollow pipe whose upper end is opened,
Has a cam portion D _1, and the lock releasing plate fixed to an upper end portion of the lock release wire,
Consists of
When in the upper position of use, when pulling operating the unlocking wire, cam portion D ₁ of the unlocking plate acts on the cam portion C ₂ of the lock pin, so that the lock pin is moved in the unlocking direction It is the structure to do.

This configuration can be particularly preferably used when the pair of left and right headrest stays are held up and down with respect to the upper part of the seat back (more precisely, the stay holder fixed to the upper part of the seat back). . This is because the lock release plate fixed to the lock release wire acts on the cam portion C ₂ provided at the end of the lock pin, and the height of the headrest can be adjusted. This is because even if the structure is adopted, it is not necessary to handle the unlocking wire in a complicated manner.

  Moreover, the following structures are suitable as an aspect using a lever (lock release lever) as a lock release member. In other words, the lock release member is a lock release lever for moving the lock pin in the lock release direction. The lock release lever may be formed integrally with the lock pin, or may be indirectly connected to the lock pin via a power transmission mechanism such as a gear or a wire. . In this configuration, the unlocking member can have a very simple structure. This configuration can also be used when the headrest fixing bracket is fixed to the upper part of the headrest stay that is held up and down relative to the upper part of the seat back. It can also be employed when fixed to the.

  The unlocking member is not limited to the above-described one using the unlocking wire or the one using the unlocking lever, and may be a push button or a strap.

By the way, in the headrest of the present invention, when the headrest stay is not structured to be able to be raised and lowered with respect to the upper part of the seat back,
It further includes a seat frame bracket for fixing to the seat frame,
Of seat frame bracket and fixed bracket,
Or
Of the seat frame bracket and the separately provided spindle bracket,
On one side, a hook part is formed, and on the other side, a hook fitting part that can be fitted to the hook part is formed,
By fitting the hook fitting part to the hook part, it consists of a rotation bracket, headrest frame, main shaft, fixed bracket, rotation bracket biasing spring, lock pin, lock pin biasing spring and unlocking member It is also preferable that the headrest units to be positioned are positioned with respect to the seat frame bracket so that they can be fixed to each other with bolts.

  As a result, the headrest manufactured as a unit by the headrest manufacturer can be easily assembled to the seat back by the assembly manufacturer. In addition, even if the detailed specifications of the headrest are changed, the assembly manufacturer can assemble the headrest to the seat back in the same manner as before the change. In addition, the headrest during use can be made less likely to wobble. In particular, when an external force is applied to the headrest in use (particularly, when an external force is applied from the front), the external force can be received by the hook portion and the hook fitting portion.

  As described above, according to the present invention, it is possible to provide a 180-degree foldable headrest capable of reducing the front-rear thickness even when the height is increased. In addition, it is possible to provide a 180-degree foldable headrest that can also be suitably employed in the aspect of adjusting the height. Furthermore, it is possible to reduce the weight and improve the productivity of the 180-degree folding headrest.

It is the perspective view which showed the state which decomposed | disassembled the headrest of 1st embodiment. It is the figure which showed the state which looked at the headrest of 1st embodiment from the front and the side. It is the side view which showed the state which looked from the side the state which the headrest of a 1st embodiment is in the upper position at the time of use, and the state in the front lower position at the time of non-use. It is the figure which showed the other embodiment of the lock release plate. It is the figure which showed the state which looked at the headrest of 2nd embodiment from the front and the side. It is the figure which showed the modification of the headrest of a 2nd embodiment. (A) The figure which showed the state seen from the front, and (b) The figure which showed the cross section cut | disconnected by the (alpha)-(alpha) plane in the same figure. (A) The state where the release operation is not performed at the upper position during use, (b) The state where the release operation is performed at the upper position when used, in the vicinity of the rotating bracket and the fixed bracket in the headrest of the third embodiment And (c) It is the figure which showed the state seen from the side about each of the state in the front lower side position at the time of non-use.

  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 (first embodiment, second embodiment and third embodiment) as examples. However, the technical scope of the headrest of the present invention is not limited to those of these embodiments. The headrest of the present invention can be modified as appropriate without departing from the spirit of the invention. 1 to 8 described later represent the x-axis, y-axis, and z-axis, but in the following, the x-axis direction negative side is the “left” side, the x-axis direction positive side is the “right” side, and y A description will be given assuming that the negative side in the axial direction is the “rear” side, the positive side in the y-axis direction is the “front” side, the negative side in the z-axis direction is the “lower” side, and the positive side in the z-axis direction is the “upper” side.

1. First, the headrest of the first embodiment will be described. FIG. 1 is a perspective view showing a state in which the headrest of the first embodiment is disassembled. Drawing 2 is a figure showing the state where the headrest of the first embodiment was seen from the front and the side. FIG. 3 is a side view showing a state in which the headrest according to the first embodiment is in the upper position when in use and in the lower front position when not in use as viewed from the side. In FIG. 3, a cross section obtained by cutting a part of the headrest (a circled portion) along a plane perpendicular to the main shaft 21 is enlarged.

  As shown in FIG. 1, the headrest according to the first embodiment includes a rotating bracket 11, a headrest frame 12, a main shaft 21, a fixed bracket 22, a rotating bracket urging spring 23, a lock pin 24, and a lock. The pin urging spring 25, the lock release member 26, the lock pin support shaft 27, and a pair of left and right headrest stays 31 and 32 are configured. As shown in FIG. And the headrest frame 12 is rotated approximately 180 ° between the upper position when used (FIG. 3A) and the lower front position when not used (FIG. 3B) with respect to the fixed bracket 22 and the like. It is a foldable type having a movable structure.

  As shown in FIG. 2, the headrest according to the first embodiment is attached to the upper ends of a pair of left and right headrest stays 31 and 32 by a strong integral connection. The headrest stays 31 and 32 are held in a state where they can be raised and lowered with respect to stay holders 41 and 42 fixed to the upper part of a seat back (not shown). In the headrest of the first embodiment, each of the headrest stays 31 and 32 is a hollow pipe whose upper end is opened, but the lock release wire 26a described later is formed by the hollow pipe in this way. Only the headrest stay 31 to be inserted is sufficient, and the other headrest stay 32 need not be formed by a hollow pipe.

1.1 Headrest Frame The headrest frame 12 is a member for imparting strength to the main body of the headrest (the portion that supports the head of the seated person). As shown in FIG. 1, the headrest frame 12 has a gate shape including a pair of left and right vertical frame portions 12a and 12b and a horizontal frame portion 12c that connects upper portions of the vertical frame portions 12a and 12b. The vertical frame 12a, 12b, to the outer surface of the side wall _A 2, _{A 3} at the pivot bracket 11 to be described later, is fixed by welding or the like. The periphery of the headrest frame 12 is covered with a cushion material and an outer skin (not shown).

1.2 Rotating bracket As shown in FIG. 1, the rotating bracket 11 includes a rear wall portion A ₁ and a pair of left and right side wall portions A ₂ and A ₃ erected forward from both side edge portions of the rear wall portion A _1. It is a groove type member having. In the headrest of the first embodiment, the side wall portions A ₂ and A ₃ are arranged outside the side wall portions B ₂ and B _{3 of} the fixing bracket 22 described later. Further, the front edge portions of the side wall portions A ₂ and A ₃ are bent outwardly in a flange shape. Therefore, the rotating bracket 11 has a cross-sectional hat as shown in a circled portion in FIG. 2 (a cross-sectional view in which the rotating bracket 11 and the vertical frame portions 12a and 12b of the headrest frame are cut along a plane perpendicular to the z-axis). It has a shape, is excellent in strength, and can be thinned. In addition, the side wall section A _2, A ₃ which are bent in a flange shape, so that the outer peripheral portion of the bottom is covered in the vertical frame portions 12a, 12b of the headrest frame 12. The lower end portions of the vertical frame portions 12a and 12b are in a state of extending to the vicinity of a main shaft 21 described later (near the rotation center of the rotation mechanism of the headrest). Therefore, the rigidity in the vicinity of the main shaft 21 (near the rotation center in the rotation mechanism of the headrest) in the rotation side member of the headrest is in a state of being increased. Therefore, in combination with a fixed bracket 22 that is firmly integrated with the main shaft 21, which will be described later, the headrest turning mechanism can withstand a large torque while suppressing its front and rear thickness, and the headrest is tall. Even so, it can be suitably employed.

The lower edge of the wall portion A ₁ after hinge bracket 11 has an engaging portion A _4. The engagement portion A _4, as shown in FIG. 3 (a), in order to regulate the rearward turning of use when the headrest (headrest in upper position), the engaging portion B ₄ of the fixing bracket 22 to be described later It becomes the part latched by. In the headrest of the first embodiment, the lower edge of the rear wall portion A _1, forms a bent portion by bending the front, the lower surface of the bent portion is set to be an engaging portion A ₄ ing. For this reason, it is not necessary to separately provide a stopper member or the like for receiving the force applied to the headrest body from the front by the head of the seated person, etc., but the force is distributed on the surface (the lower surface of the bent portion). The rotating bracket 11 can be further reduced in thickness and weight. The bent portion may be provided on the upper portion of the wall portion B ₁ after fixing bracket 22.

In the headrest of the first embodiment, the vicinity of the lower end portion of the side wall portion A _2, A ₃ of the hinge bracket 11 is provided with a locking portion X ₁ respectively. The locking portion X _1, as shown in FIG. 3 (a), in order to restrict the forward rotation of the use headrest (headrest in upper position), the engagement portion C ₁ of the lock pin 24 to be described later It becomes the part latched by. In the headrest of the first embodiment, the locking portion X ₁ is a substantially semicircular cutout portion that follows the outer peripheral shape of the lock pin 24. Thus, by providing the locking portion X ₁ for locking the locking portion C ₁ of the lock pin 24 on both the side wall portions A ₂ and A ₃ , the lock pin 24 is added to the rotating bracket 11. The force can be distributed at the side wall portions A ₂ and A ₃ . Therefore, even if the thickness of the rotating bracket 11 is reduced, the required strength can be obtained, the headrest can be further reduced in weight, and the molding can be performed by a general press work. It has become.

1.3 Main shaft The main shaft 21 is a shaft-like member for supporting the rotating bracket 11 in a rotatable state. In the headrest of the first embodiment, as shown in FIG. 1, the main shaft 21 is a protruding piece that is fixed to the upper end portions of the headrest stays 31 and 32 and is erected forward from a wire fixing auxiliary member 26 d described later. And fixed and integrated by welding with a sufficient length corresponding to the load torque (total length 100 mm in the case of the main shaft diameter 12 mm).

1.4 Fixed Bracket As shown in FIG. 1, the fixed bracket 22 includes a rear wall portion B ₁ and a pair of left and right side wall portions B ₂ and B ₃ that rises forward from both side edge portions of the rear wall portion B _1. Although it is a groove-shaped member having a strength similar to that of the rotating bracket 11, it can be thinned and can be molded by a general press process. Yes. An upper edge portion of the rear wall portion B ₁ of the fixed bracket 22 is a locking portion B ₄ for locking to the locking portion A ₄ of the rotating bracket 11. A large-diameter through hole is provided in each of the central portions of the side wall portions B ₂ and B ₃ of the fixing bracket 22, and the main shaft 21 is inserted into the through hole and has a sufficient length corresponding to the load torque. Are fixed and integrated by welding (total length 100 mm in the case of a spindle diameter of 12 mm). Further, in the headrest of the first embodiment, small-diameter through holes are provided in front lower portions of the side wall portions B ₂ and B ₃ , respectively, and lock pin support shafts 27 are inserted and fixed in the through holes. ing.

1.5 Rotating bracket urging spring The urging bracket urging spring 23 constantly urges the rotating bracket 11 toward the front lower side position (always urges the headrest main body in a direction to rotate forward). It is a member for. In the headrest of the first embodiment, the rotation bracket urging spring 23 is a coil spring that is externally fitted to the main shaft 21.

1.6 Lock Pin As shown in FIG. 3A, the lock pin 24 is in a state in which the rotation-side member 10 cannot rotate forward with respect to the fixed-side member 20 when the headrest is in the upper position during use. Thus, the shaft-like member for locking the rotation bracket 11 (rotation side member) with respect to the fixing bracket 22 (fixation side member) is provided. In the headrest of the first embodiment, the lock pin 24 is rotated with respect to the lock pin support shaft 27 so that the lock pin 24 can be turned up and down with respect to the side wall portions B ₂ and B ₃ of the fixing bracket 22. It is installed in a movable state. A part of the outer peripheral surface of the lock pin 24 is a locking portion C ₁ for locking to a locking portion X ₁ provided on the side wall portions A ₂ and A ₃ of the rotating bracket 11. Further, in the lock pin 24 the outer peripheral surface of one end side of the cam portion D ₁ of the unlocking plate 26b which will be described later, has a cam portion C ₂ to act.

1.7 the lock pin urging spring lock pin biasing spring 25, the locking direction of the lock pin 24 thereof engaging portion C ₁ is engaged with the engaging portion X ₁ (the direction in which the lock pin 24 is pivotally raised) It is a member for always energizing. In the headrest of the first embodiment, the lock pin urging spring 25 is a coil spring that is externally fitted to the lock pin support shaft 27.

1.8 unlocking member unlocking member 26 is forcibly moved in the unlocking direction the locking pin 24 the locking portion C ₁ disengaged from the locking portion X ₁ (the direction in which the lock pin 24 is lowered rotation) It is a member for. The specific structure of the unlocking member 26 is not particularly limited. However, in the headrest of the first embodiment, as shown in FIG. 1, the unlocking wire 26a, the unlocking plate 26b, the wire fixing member 26c, And the wire fixing auxiliary member 26d.

  The unlocking wire 26a has a so-called brake wire structure. Specifically, the unlocking wire 26a includes an outer tube and an inner wire inserted into the outer tube in a state of being movable in the longitudinal direction with respect to the outer tube. It is configured. The lock release wire 26 a is inserted into the headrest stay 31. The lower end side of the unlocking wire 26a is pulled out from the lower end portion of the headrest stay 31, and the lower end portion of the inner wire is a pulling operation means (means for pulling the inner wire of the unlocking wire 26a; lever, A button, a strap, etc.).

On the other hand, the upper end portion of the outer tube of the unlocking wire 26 a is fixed to the wire fixing member 26 c fixed to the upper end portion of the headrest stay 31. Further, the lock release plate 26b is fixed to the upper end portion of the inner wire of the lock release wire 26a. The lock release plate 26b is attached to the wire fixing auxiliary member 26d fixed to the upper end of the headrest stay 31 so as to be movable up and down. The lower surface of the lock release plate 26b is connected to the cam portion C of the lock pin 24. and functions as a cam portion D ₁ acting on _2.

Further, as described above, the lock release plate 26b can perform other operations in addition to the lifting operation. FIG. 4 is a view showing another embodiment of the lock release plate 26b. 4 includes a first piece portion 26b ₁ for attaching the upper end portion 26a ₁ of the lock release wire 26a, and a second side portion 26b ₂ attached to the main shaft 21 in a rotatable state. It consists of The unlocking plate 26b, when the inner wire of the lock releasing wire 26a is pulled downward, the rear end portion of the first arm portion 26b ₁ is pushed downward by the upper end portion 26a ₁ of the lock releasing wire 26a, the spindle 21 of the center P ₁ rotates as the pivot center, so that the lock pin 24 with the cam portion D ₁ provided on the lower edge of the second side portion 26b ₂ acts on the cam portion C ₂ of the lock pin 24 is pushed down It has become. In this way, by making the lock release plate 26b a pivotal type, the operation of the lock release plate 26b can be stabilized.

  By the way, in the headrest of the first embodiment, as described above, both ends of the main shaft 21 are fixed to the wire fixing auxiliary member 26d (the wire fixing auxiliary member 26d is not only the lock releasing wire 26a but also the main shaft. Therefore, the wire fixing auxiliary member 26d is provided on both the headrest stays 31 and 32. However, when adopting a configuration in which the main shaft 21 is fixed to the headrest stays 31 and 32 without using the wire fixing auxiliary member 26d, the wire fixing auxiliary member 26d is provided on the side of the headrest stay 31 on the side where the unlocking wire 26a is provided. It is not necessary to provide the headrest stay 32 on the other headrest stay 32.

1.9 Operation of Headrest of First Embodiment The operation of the headrest of the first embodiment described above will be described.

As shown in FIG. 3A, when the headrest of the first embodiment is in the upper position during use, the lock pin 24 is moved upward by the biasing force of the lock pin biasing spring 25 (the lock pin support shaft). 27, the locking portion C ₁ of the lock pin 24 is locked to the locking portion X ₁ of the rotation bracket 11. For this reason, even if it is a case where force is applied to the main part of a headrest from back, the forward rotation is controlled. Also, when the headrest is in the upper position of use, the engaging portion A ₄ of the engaging portion B ₄ and the turning bracket 11 of the fixing bracket 22 is also adapted to lock each other, the fixing bracket 22 is the main shaft 21 Is firmly integrated. For this reason, even when a force is applied to the main body of the headrest from the front, the backward rotation is restricted.

On the other hand, when the headrest according to the first embodiment is in the upper position during use, the tension operating means (lever, button, strap, etc.) is operated, and the inner wire of the unlocking wire 26a (FIG. 1) is When the pulling operation is performed downward, the lock release plate 26b (FIG. 1) is lowered with respect to the fixing auxiliary member 26d (FIG. 1), and the cam portion D ₁ (FIG. 1) of the lock release plate 26b is the cam portion of the lock pin 24. By depressing C ₂ (FIG. 1), the lock pin 24 is forced to move in the unlocking direction (downward) against the biasing force of the lock pin biasing spring 25 (FIG. 1). Yes. Therefore, a state where the engagement is disengaged with the engagement portion C ₁ of the engaging portion X ₁ and the lock pin 24 by the biasing force of the hinge bracket biasing spring 23, rotation bracket 11 is rotated forward, As shown in FIG. 3 (b), it moves to the lower front position when not in use.

  When the front lower position shown in FIG. 3B is reached, the main body of the headrest (the portion that supports the head of the seated person) is in a state along the front surface of the seat back. In the headrest of the first embodiment, as described above, the rotation mechanism is realized with a simple structure, and the lock pin 24 that can be turned up and down is adopted as a member that restricts the forward rotation of the headrest. Even when the frame 12 is long in the vertical direction, it is possible to suppress the front-rear thickness of the headrest body. For this reason, it is possible to fold the headrest without protruding forward from the front surface of the seat back, and in the case of folding the seat back forward, the seat back can be folded compactly. . When the headrest is to be changed from the state shown in FIG. 3B (stored state) to the state shown in FIG. 3A (used state) again, the headrest body is grasped with a hand or the like and rotated backward. Good.

2. Next, the headrest of the second embodiment will be described. FIG. 5 is a diagram illustrating a state in which the headrest according to the second embodiment is viewed from the front and the side. In FIG. 5, an enlarged cross section of a part of the headrest (circled portion) cut by a plane perpendicular to the main shaft 21 is shown. FIG. 6 is a view showing a modification of the headrest of the second embodiment. Below, it demonstrates focusing on a structure different from the headrest of a 1st embodiment among each structure in the headrest of a 2nd embodiment. Configurations not particularly mentioned in the headrest of the second embodiment can adopt the same configurations as those described in the headrest of the first embodiment.

  The headrest of the first embodiment described above is attached to the upper part of the headrest stays 31 and 32 as shown in FIG. On the other hand, the headrest of the second embodiment is fixed to a seat frame 60 (seat back frame) via a seat frame bracket 50 as shown in FIG. 5 or FIG. In the headrest of FIG. 5, the fixed bracket 22 is fixed to the seat frame bracket 50. In the headrest of FIG. 6, the fixed to the seat frame bracket 50 is the spindle bracket 80 ( Bracket) attached to the end of the main shaft 21.

In the headrest of FIG. 5, as shown in FIG. 5B, the upper front portion of the seat frame bracket 50 is a hook portion E <b> ₁ bent into a hook shape in cross section, and the lower front portion of the fixed bracket 22. Department has a hook engaging portion B ₅ bent so as to stand upward. Similarly, in the headrest of FIG. 6, as shown in FIG. 6B, the upper front portion of the seat frame bracket 50 is a hook portion E <b> ₁ that is bent into a hook shape in cross section. lower front portion, and has a hook engaging portion F ₁ of folded so as to stand upward. For this reason, both the headrest of FIG. 5 and the headrest of FIG. 6 are the rotation bracket 11, the headrest frame 12, the main shaft 21, the fixed bracket 22, the rotation bracket biasing spring 23, the lock pin 24, and the lock pin biasing spring 25. And the headrest unit composed of the unlocking member 26 can be positioned with respect to the seat frame bracket 50 and then fixed with bolts 70 (shown only in FIG. 5 and omitted in FIG. 6). It is also possible to make the headrest of the wobble difficult.

  Moreover, in the headrest of the first embodiment, as shown in FIG. 1, a wire (unlocking wire 26 a) is used as the unlocking member 26. On the other hand, in the headrest of the second embodiment, as shown in FIG. 5, the lock release lever 26 e is used as the lock release member 26 and has a very simple structure. The lock release lever 26e may be indirectly connected to the lock pin 24 through a power transmission mechanism such as a gear or a wire. However, in the headrest of the second embodiment, the lock release lever 26e is formed integrally with the lock pin 24. doing.

  Furthermore, in the headrest of the first embodiment, as shown in FIG. 1, the lock pin 24 and the lock pin support shaft 27 are separated. On the other hand, in the headrest of the second embodiment, as shown in FIG. 5B, the lock pin 24 and the lock pin support shaft 27 are integrated. Specifically, one steel wire is bent into a U-shape, one of the bent ends is used as the lock pin 24, and the other bent end is used as the lock pin support shaft 27. . By doing in this way, it becomes possible to reduce the number of parts and to reduce the labor and manufacturing cost of assembling the headrest unit.

  In addition, although the fixed bracket 22 and the main shaft 21 are fixed and integrated, in that case, the headrest of FIG. 6 is required to be firmly integrated in the same manner as the headrest of the first embodiment. However, the headrest of FIG. 5 may have a significantly weaker coupling due to the difference in structure, and the weld length may be shortened. Moreover, although the headrest of the second embodiment has changed the specific form of each member, such as the rotation bracket 11 and the headrest frame 12, from the headrest of the first embodiment, the function exhibited by these members is This is the same as the headrest of the first embodiment.

3. Next, the headrest of the third embodiment will be described. Below, it demonstrates focusing on a structure different from the headrest of a 1st embodiment or a 2nd embodiment among each structure in the headrest of a 3rd embodiment. The configurations not particularly mentioned in the headrest of the third embodiment can adopt the same configurations as those described in the headrest of the first embodiment and the second embodiment.

  FIG. 7: is the figure which showed the state which looked at the headrest of 3rd embodiment from the front, (a) The figure which showed the cross section cut | disconnected by the (alpha)-(alpha) plane in the same figure. 8A and 8B show the periphery of the rotating bracket 11 and the fixed bracket 22 in the headrest according to the third embodiment in a state where (a) the release operation is not performed at the upper position when used, and (b) the release position at the upper position when used. It is the figure which showed the state seen from the side about each of the state which is operating, and the state which exists in the front lower side position at the time of (c) non-use. In FIG. 8, for convenience of illustration, the lock release plate 26b is indicated by a bold line.

In the headrest of the first embodiment described above, as shown in FIG. 1, the lock pin 24 is supported on the side wall portions B ₂ and B ₃ of the fixing bracket 22, and the locking portion X _{1 is connected} to the side wall of the rotating bracket 11. It was provided in the parts A ₂ and A ₃ . On the other hand, in the headrest of the third embodiment, as shown in FIG. 8, the lock pin 24 is supported on the side wall portions A ₂ and A ₃ of the rotating bracket 11, and the locking portion X ₁ is fixed to the fixed bracket 22. Are provided on the side wall portions B ₂ and B ₃ . Specifically, the lock pin support shaft 27 is inserted into the lock pin support shaft insertion hole 11a provided in the side wall portions A ₂ and A ₃ (only the side wall portion A ₂ side is shown in FIG. 8) of the rotating bracket 11. The lock pin 24 is inserted into a lock pin guide hole 11b provided in the shape of a circular arc long hole in the side wall portions A ₂ and A ₃ and is locked to the upper portion of the side wall portions B ₂ and B ₃ of the fixing bracket 22. the part _{X 1} are provided. In the headrest of the third embodiment, the lock pin 24 and the lock pin support shaft 27 have the same form as the headrest of the second embodiment described above. That is, one steel wire is bent into a U-shape, and one bent end of the steel wire is used as the lock pin 24, and the other bent end is used as the lock pin support shaft 27.

  Moreover, in the headrest of the first embodiment described above, as shown in FIG. 1, the rotating bracket 11 and the fixed bracket 22 are provided only at one location near the center of the main shaft 21. On the other hand, in the headrest of the third embodiment, as shown in FIG. 7, the rotating bracket 11 and the fixing bracket 22 are provided at two places, one on the right side and one on the left side. The lower end of the right vertical frame portion 12a is welded to the right rotating bracket 11, and the lower end of the left vertical frame portion 12b is welded to the left rotating bracket 11. The right fixing bracket 22 is fixed to the upper end portion of the right headrest stay 31, and the left fixing bracket 22 is fixed to the upper end portion of the left headrest stay 32. For this reason, when the headrest is viewed from the front, the right vertical frame portion 12a and the right headrest stay 31 are arranged in a straight line in the vertical direction via the right rotation bracket 11 and the fixed bracket 22, and the left side The vertical frame portion 12 b and the left headrest stay 32 are arranged in a straight line in the vertical direction via the left rotation bracket 11 and the fixed bracket 22.

  Furthermore, in the headrest of the first embodiment, as shown in FIG. 1, the wire fixing auxiliary member 26 d is provided at the upper end portion of the right headrest stay 31. On the other hand, in the headrest of the third embodiment, as already described, the fixing bracket 22 is directly fixed to the upper end portion of the right headrest stay 31, so that it is as shown in FIG. In addition, a portion corresponding to the wire fixing auxiliary member 26d is provided integrally with the right fixing bracket 22 (the wire fixing auxiliary member 26d separate from the fixing bracket 22 is not provided).

As shown in FIG. 8A, when the headrest of the third embodiment is in the upper position during use, the lock pin 24 moves downward by the urging force of the lock pin urging spring 25 (FIG. 7). and (descending rotated about the locking pin supporting shaft 27), the locking portion C ₁ of the lock pin 24 is adapted to the state engaged with the engagement portion X ₁ of fixed bracket 22. For this reason, even if it is a case where force is applied to the main part of a headrest from back, the forward rotation is controlled. At this time, the force is received by a total of four locking portions X ₂ provided on the side wall portions B ₂ and B ₃ of the left fixing bracket 22 and the right fixing bracket 22. Therefore, the headrest can exhibit more sufficient strength.

Further, the headrest of the third embodiment, as shown in FIG. 8 (a), when in the upper position during use, even engagement portion A ₄ of the engaging portion B ₄ and the turning bracket 11 of the fixing bracket 22 They are designed to be locked together. For this reason, even when a force is applied to the main body of the headrest from the front, the backward rotation is restricted. At this time, substantially all of the force is directly received by the fixing bracket 22 fixed to the headrest stay 31. Accordingly, no torsional force is applied to the main shaft 21, and it is possible to prevent a large load from being applied to the joint portion between the main shaft 21 and the fixed bracket 22.

  Furthermore, as shown in FIG. 8A, when the headrest of the third embodiment is in the upper position during use, when it hits the main body of the headrest (the part that supports the user's head) ( Even when a force is applied only to one side in the left-right direction), the right rotation bracket 11, the fixed bracket 22, the vertical frame portion 12a and the headrest stay 31, and the left rotation bracket 11, Since the fixing bracket 22, the vertical frame portion 12b, and the headrest stay 32 can be firmly received, twisting occurs such that one of the left and right sides of the headrest body moves forward and the other moves backward. It is also possible to avoid it.

  Thus, the headrest of the third embodiment is advantageous in terms of strength compared to the headrest of the first embodiment. Therefore, the strength can be increased without increasing the size of the headrest.

In the headrest according to the third embodiment, when the inner wire of the unlocking wire 26a is pulled downward when the headrest is in the upper position during use, as shown in FIG. 8B, the rear end of the unlocking plate 26b. part is lowered relative to the fixed bracket 22 (wire fixation assisting member 26 d), by the cam portion _{D 1} of the unlocking plate 26b pushes up the cam portion _{C 2} of the lock pin 24, lock pin 24 is, with the locking pin The force spring 25 (FIG. 7) is forced to move in the unlocking direction (upward) against the urging force. Therefore, a state where the engagement is disengaged with the engagement portion C ₁ of the engaging portion X ₁ and the lock pins 24, by the urging force of the hinge bracket biasing spring 23, rotation bracket 11 is rotated forward, As shown in FIG.8 (c), it moves to the front lower side position at the time of non-use.

4). Uses The headrest of the present invention, such as the headrest of the first embodiment and the second embodiment described above, can be provided in various seats, and the use thereof is not particularly limited. It is suitable as what is provided in the seat back of a seat. In particular, it is suitable for use in the last row of seats in a hatchback type automobile.

DESCRIPTION OF SYMBOLS 11 Rotating bracket 11a Lock pin support shaft insertion hole 11b Lock pin guide hole 12 Headrest frame 12a Vertical frame part 12b Vertical frame part 12c Horizontal frame part 21 Spindle 22 Fixed bracket 23 Rotating bracket urging spring 24 Lock pin 25 With lock pin Spring 26 26 Unlocking member 26a Unlocking wire 26a ₁ Upper end of unlocking wire 26b Unlocking plate 26b ₁ First piece 26b ₂ Second piece 26c Wire fixing member 26d Wire fixing auxiliary member 26e Unlocking lever 27 Lock pin Support shaft 31 Headrest stay (right side)
32 Headrest stay (left side)
41 Stay holder (right side)
42 Stay holder (left side)
50 Seat frame bracket 60 Seat frame 70 Bolt 80 Spindle bracket A Rear wall part of the ₁ rotation bracket A Side wall part of the ₂ rotation bracket (right side)
A ₃ Side wall of the rotating bracket (left side)
A ₄ Rotating bracket locking part (for backward rotation restriction)
B ₁ Rear bracket part of the fixing bracket B ₂ Side wall part of the fixing bracket (right side)
B ₃ Side wall of fixed bracket (left side)
Locking part of B ₄ fixed bracket (for backward rotation restriction)
B ₅ Hook fitting part of fixed bracket C ₁ Locking part of lock pin C ₂ Cam part of lock pin D ₁ Cam part of unlocking plate E ₁ Hook part of seat frame bracket F ₁ Hook fitting part of spindle bracket X ₁ Rotating bracket or fixed bracket locking part (for restricting forward rotation)

Claims (6)

A foldable headrest having a structure capable of rotating by approximately 180 ° between an upper position when in use and a front lower position when not in use,
A rotating bracket having a rear wall portion A ₁ and a pair of left and right side wall portions A ₂ , A _3, and a locking portion A ₄ provided at the lower portion of the rear wall portion A ₁ ;
A headrest frame having a gate shape having a pair of left and right vertical frame portions and a horizontal frame portion connecting upper portions of the vertical frame portions, and fixed to the rotating bracket;
A spindle that is fixed directly or indirectly to the upper part of the headrest stay or the upper part of the seat back frame, and the pivot bracket is rotatably supported;
A fixing bracket having a rear wall part B ₁ and a pair of left and right side wall parts B ₂ , B ₃ , a locking part B ₄ provided on the upper part of the rear wall part B ₁ , and fixed to the main shaft;
A rotating bracket biasing spring for constantly biasing the rotating bracket toward the front lower position;
A lock pin that is supported so as to be able to move up and down with respect to the side wall portions A ₂ and A _{3 of the} rotating bracket or the side wall portions B ₂ and B _{3 of the} fixed bracket, and has a locking portion C ₁ on a part of its outer peripheral surface;
The lock pin, the locking portion C ₁ is provided in the side wall portion A _2, A ₃ or side wall B _2, B ₃ towards the lock pin of the hinge bracket and the fixed bracket is not supported locking a lock pin urging spring for constantly urging the locking direction to be engaged in section X _1,
A lock release member that the locking pin is that locking portion C ₁ is forcibly moved in the unlocking direction deviating from the locking part X _1,
Consists of
At least one of the locking part A _{4 and the} locking part B ₄ is a bent part provided at the lower part of the rear wall part A ₁ or the upper part of the rear wall part B ₁ ,
When in the upper position when in use,
By the engagement portion C ₁ engaging portion X ₁ and the lock pin is locked, even if the force from the rear is applied forward rotation is regulated,
By the engagement portion A ₄ of the engaging portion B ₄ and the rotating bracket fixing bracket is locked, even when a force is applied from the front rearward turning is restricted,
Moving the locking pin in the unlocking direction by operating the unlocking member disengages the locking portion C ₁ of the engaging portion X ₁ and the lock pin, and rotated forward by the biasing force of the biasing spring hinge bracket The headrest is designed to be in the lower front position when not in use. While the side wall portions A ₂ and A _{3 of the} rotating bracket are positioned outside the side wall portions B ₂ and B _{3 of} the fixed bracket,
Side wall portions A ₂ and A ₃ are disposed in contact with the outer peripheral surface of the vertical frame portion of the headrest frame,
The headrest according to claim 1, wherein the lower end portion of the vertical frame portion of the headrest frame extends to the vicinity of the main shaft. The lock pin is supported by the side wall portions A ₂ and A ₃ of the rotating bracket,
With the locking portion _{X 1} is provided on the side wall _B 2, _{B 3} of the fixed bracket,
A pivot bracket and a fixed bracket are provided at the lower end of the left vertical frame portion and the lower end of the right vertical frame portion in the headrest frame, respectively.
The main shaft is inserted into the left and right fixing brackets and welded,
The left side fixing bracket and the right side fixing bracket are fixed to an upper end portion of each stay of the pair of left and right headrest stays or an upper portion of a seat back frame accommodated in the seat back. Headrest. A pair of left and right headrest stays consisting of a hollow pipe at least one of which is open at the upper end;
A stay holder fixed to the upper part of the seat back and holding the headrest stay in a state where it can be raised and lowered;
Of the pair of left and right headrest stays, a wire fixing member and a wire fixing auxiliary member fixed to the upper end portion of the headrest stay on the side made of a hollow pipe whose upper end portion is opened,
Further comprising
The lock pin has a cam portion C ₂ on the outer circumferential surface of one end,
The unlocking member is
An unlocking wire inserted into the headrest stay consisting of a hollow pipe whose upper end is opened,
Has a cam portion D _1, and the lock releasing plate fixed to an upper end portion of the lock release wire,
Consists of
When in the upper position of use, when pulling operating the unlocking wire, cam portion D ₁ of the unlocking plate acts on the cam portion C ₂ of the lock pin, so that the lock pin is moved in the unlocking direction The headrest according to claim 1.   The headrest according to any one of claims 1 to 3, wherein the lock release member is a lock release lever for moving the lock pin in the lock release direction. It further includes a seat frame bracket for fixing to the seat frame,
Of seat frame bracket and fixed bracket,
Or
Of the seat frame bracket and the separately provided spindle bracket,
On one side, a hook part is formed, and on the other side, a hook fitting part that can be fitted to the hook part is formed,
By fitting the hook fitting part to the hook part, it consists of a rotation bracket, headrest frame, main shaft, fixed bracket, rotation bracket biasing spring, lock pin, lock pin biasing spring and lock release member 6. The headrest according to claim 1, wherein the headrest unit is positioned with respect to the seat frame bracket and can be fixed to each other with a bolt in that state.

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