JPH1080335A - Swing structure for headrest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily apply an integral expansion molding method and provide a good external appearance. SOLUTION: The swing structure for headrest comprises a frame 2 incorporated in a pad material 41 composed of an expanded material of a synthetic resin and poles 3 mounted to the frame 2 so as to be relatively swingable, and the poles 3 are mounted to the top portion of a seat back S. In this case, the frame 2 has a pole mount space 26 having an opening at its bottom and the top portion of each pole 3 is fitted in the space 26 and the top end of the pole 3 is supported on a horizontal axis 29 so that the pole 3 can be relatively swung about the axis 29 and the frame 2 is embedded in the pad material 4 by an integral expansion molding method, using an expandable synthetic resin as a raw material, under such conditions that the expanded material is not allowed to get into the space 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headrest swing structure in which a headrest mounted on the top of a seat back is swung according to a pressing state of a head.

[0002]

2. Description of the Related Art Conventionally, there are known headrest swing structures as shown in FIGS. The swing structure shown in FIG. 5A is formed by bending an inverted U-shaped pole member P mounted on the top of the seat back S and a metal plate fitted into the horizontal rod P1 of the pole member P. It is formed to include a bearing member H1 and a flat frame F fixed to the bearing member H1. The bearing member H1 is fixed to the center portion of the frame F by bolting on both sides in a state where the concave portion is fitted into the horizontal rod P1, whereby the frame F is pivotally supported around the horizontal rod P1. It is in a state. The headrest H is formed by mounting the pad material H0 on such a frame F.

[0005] A swing structure shown in FIG. 5B includes a bridge member P3 having a U-shape in plan view extending between the tops of a pair of pole members P, and a bridge member P3 formed on both sides of the bridge member P3. A pair of formed brackets P4 extending in the width direction extending in the front-rear direction.
And an inverted U-shaped frame F1 attached to each of the brackets P4 so as to be swingable around the bolt B. By mounting the pad material H0 on the frame F1, the headrest H
Are formed.

Accordingly, in any of the swing structures described above, when the occupant presses the head against the surface of the headrest H to move the head, the headrest H is moved around the horizontal rod P1 or bolted in accordance with the movement. Swing around B.

[0005]

By the way, in the swing structure of the headrest as shown in FIG. 5, the bearing member H1 which is externally fitted to the horizontal rod P1 (FIG. 5A).
When the bolts B ((b) in FIG. 5) are exposed to the outside, the appearance of the headrest H becomes unsightly. Therefore, the bearing member H1 and the bolts B are covered with the pad material H0 to prevent the appearance. However, if they are covered, the pad material H0 and the pole material P interfere with each other, which causes a new problem that the swing function is impaired.

[0006] The headrest H is often manufactured by a so-called integral foaming molding method in which the headrest H is integrally formed with a frame or a pole material. In the headrest H having the conventional swing structure as described above, The structure of the mold becomes very complicated, and it is extremely difficult to apply the integral foam molding method.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a swing structure of a headrest which can easily be applied to the integral foam molding method and can provide a beautiful appearance. It is intended to be.

[0008]

According to a first aspect of the present invention, there is provided a swing structure for a headrest, wherein the frame is mounted on a pad material made of a synthetic resin foam and is attached to the frame so as to be relatively swingable. The frame has a pole support member at the bottom, and the pole support member has a pole that opens downwardly in a headrest swing structure that is configured to be mounted on the top of a seat back. A mounting space is formed, and the base end side of the pole is fitted in the pole mounting space, and the pole is swingably supported.

According to the swing structure of the headrest, since the headrest can swing around the horizontal axis in a state where the headrest is mounted on the top of the seatback via the pole, the occupant of the seatback can take the seatrest. By pressing the head against the headrest, the headrest swings about a horizontal axis, and always has an optimal angle.

Since the pole support member is housed in the pad material, it cannot be seen from the outside, so that the appearance of the headrest is simple and unobtrusive.

According to a second aspect of the present invention, in the headrest swing structure according to the first aspect, the frame has a sense of moderation with respect to the swing of the pole on the inner peripheral surface of the pole mounting space. It has a moderating member to be provided.

According to the swing structure of the headrest, a moderation feeling is obtained by the moderation member when the headrest swings.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway perspective view showing an embodiment of a headrest to which a headrest swing structure according to the present invention is applied. Hereinafter, in FIG. 1, the XX direction is referred to as a width direction, and the YY direction is referred to as a front-back direction. As shown in FIG. 1, a headrest 1 includes a frame 2 having a long rectangular shape in the width direction when viewed from the front,
A pair of poles 3 in the width direction extending downward from
And a headrest body 4 in which the frame 2 is embedded.

In the present embodiment, the frame 2 is formed by injection molding using a hard synthetic resin as a raw material. The frame 2 includes a frame plate 21 formed at an upper portion and having a rectangular shape in a front view, and a pair of pole support portions 23 extending downward on both sides in the width direction of the lower portion of the frame plate 21. ing. A columnar frame 22 is provided on the outer peripheral portion of the frame plate 21, and the frame 22 reinforces the frame plate 21.

Each of the pole support portions 23 is formed so as to expand downward in a side view, and has inclined walls 24 inclined obliquely downward in the front-rear direction and a pair of front and rear inclined walls 24 provided on both sides. And a side wall 25. In the pole support portion 23, a pole mounting space 26 with an upper constriction surrounded by the pair of side walls 25 and the pair of inclined walls 24 is formed. An opening 27 for inserting the upper end of the pole 3 into the space 26 is formed below the pole mounting space 26.

In addition, a connecting plate 28 is bridged between the pair of pole supporting portions 23, and the connecting plate 28 makes it difficult for each of the pole supporting portions 23 to be deformed in the width direction. The lower surface of the connecting plate 28 and the opening 27 of the pole support 23
The lower surface of the peripheral portion is flush with the lower surface.

Each of the poles 3 is for inserting the headrest 1 into the seatback S by inserting them into the mounting hole S1 formed at the top of the seatback S, and has a base end (upper portion). The opening 27 is inserted into the pole mounting space 26 of the pole support 23, and the upper end thereof is rotatably supported around a horizontal axis 29 that crosses the pole mounting space 26 in the width direction.

FIG. 2 is a sectional view taken along line AA of FIG. As shown in the figure, the pole mounting space 26 has a wide portion 26a formed at a lower portion between the left and right side walls 25 and a gap size slightly larger than the diameter of the pole 3 and an upper portion of the wide portion 26a. And a narrow portion 26b extending narrower than that. On the other hand, the pole 3 has a flat portion 31 corresponding to the narrow portion 26b at the upper part.
The thickness of the flat portion 31 is set so that the flat portion 31 can be fitted inside the narrow portion 26b.

A shaft hole 26c is formed in the narrow portion 26b so as to penetrate the left and right side walls 25.
A mounting hole 32 corresponding to the shaft hole 26c is formed in the flat portion 31 of the pole 3, and a horizontal shaft 29 is inserted through the shaft hole 26c and the mounting hole 32 to caulk both ends. Numeral 3 is capable of swinging relative to the frame 2 about a horizontal axis 29.

The swing structure according to the present invention comprises:
A pole supporting portion 23 which forms a lower portion of the frame 2 and has a pole mounting space 26 therein; an upper portion fitted into the pole mounting space 26 and an upper end portion formed of the frame 2
And a pole 3 that is rotatably supported about a horizontal axis 29.

FIG. 3 is a view taken along the line B in FIG. 2. FIG. 3A shows a state in which the moderating projection 27a of the first embodiment is formed in the opening 27 of the pole support 23, and FIG. The state in which the moderation protrusion 27b of the second embodiment is formed is shown.
First, in the first embodiment, as shown in FIG. 3A, a moderating projection 27a extending in the front-rear direction (vertical direction on the paper surface of FIG. 3) is provided on the inner surface of one side wall 25 in the opening 27. Is protruding. The detent protrusion 27a is set to have a dimension slightly shorter than the front-rear length of the opening 27, so that a home position where the pole 3 can be stably positioned is formed at the front and rear ends of the opening 27.

The thickness of the moderating projection 27a in the width direction (the left-right direction in FIG. 3) is determined by setting the pole 3 to the horizontal shaft 29 (FIG. 1).
By pivoting around the frame 2 relative to the frame 2, the pole support portion 23 is elastically deformed, and the opening 27 is widened, so that the pole 3 is set so as to be able to move over the moderation protrusion 27a.

According to the moderating projection 27a of the first embodiment,
When the frame 2 is mounted on the seat back S, the poles 3 are positioned at both ends of the opening 27 so that the mounting posture of the frame 2 is stabilized, and the horizontal axis 29 is used to change the posture of the frame 2. By rotating around, the pole 3 moves from one end of the opening 27 to the other end, and a sense of moderation can be obtained by the pole 3 riding over the moderating protrusion 27a.

Next, the moderating projection 27b of the second embodiment is
As shown in FIG. 3 (b), a plurality of arc-shaped concave portions 27c are provided in an intermediate portion. The arc diameter of the recess 27c is
The dimensions are set to be the same as the diameter of the pole 3. The configuration of the other moderation protruding pieces 27b is the same as the moderation protruding piece 2 of the first embodiment.
7a. According to the moderation protrusion 27b of the second embodiment, the pawl 3 fits into each of the concave portions 27c when the posture of the frame 2 is changed. The posture of the frame 2 is stabilized even if it is stuck, so that the degree of freedom of changing the posture of the frame 2 is increased.

As shown in FIG. 1, the headrest main body 4 includes a frame plate 21, a frame body 22, and a pole support portion 2.
The pad member 41 includes a pad material 41 in which the frame 2 is embedded, and a trim 42 covering the outer peripheral surface of the pad material 41. The pad material 41 is formed of a foamed synthetic resin foam. And in this embodiment,
The frame 2 is provided by integral foam molding, and
The headrest 1 provided with the trim 42 on the outer peripheral surface is manufactured.

FIG. 4 is a sectional view showing one embodiment of a method of manufacturing the headrest 1 according to the present invention, and shows a state where the trim 42 and the frame 2 are loaded in a mold. As shown in this figure, the headrest 1 is
It is manufactured using the mold 5 including the upper mold 52. In the present embodiment, the trim 42 and the frame 2 are previously loaded into the cavity 53 of the mold 5, and the foamable synthetic resin material is supplied to the upper mold 5 while the cavity 53 is closed by the upper mold 52.
2 to the cavity 5 from the raw material loading port 54
A so-called integral foam molding method is employed in which the foam is supplied into the trim 42 attached to the trim 3 and then subjected to a predetermined foaming treatment by heating or the like.

Specifically, first, the frame 2 is mounted inside the trim 42 with the pole 3 protruding outside, and the trim 42 with the frame 2 is mounted on the lower die 51 from which the upper die 52 is removed. Of the upper mold 5
2 is fixed to the lower mold 51. The lower mold 51 of the upper mold 52
At the time of mounting, the pole 3 is made to protrude upward from a hole formed at an appropriate position of the upper mold 52, and the fall prevention metal fitting 55 is used to prevent the frame 2 from dropping. The headrest 1 as shown in FIG. 1 is formed in the cavity 53 by loading the raw material in the trim 42, closing the raw material charging port 54 after the loading is completed, and performing a foaming process such as heating.

In the present invention, since the surface of the peripheral portion of the opening 27 of the pole supporting portion 23 is formed flush with the same plane, the trim 42 located on the back side of the upper die 52 is The trim 42 and the upper mold 52 are brought into a state of being tightly held between the peripheral portion in the flush state and the back surface of the upper mold 52.
No gap is formed between the trim 42 and the front surface of the trim 42 and the back surface of the upper mold 52, thereby reliably preventing the foam from entering the surface of the trim 42, thereby preventing contamination of the surface of the trim 42 due to leakage of the raw material. This makes it possible to reliably prevent a reduction in the commercial value of the headrest 1 due to the contamination.

The present invention is not limited to the above embodiment, but includes the following contents.

(1) In the above-described embodiment, the headrest body 4 is formed by integrally molding the pad material 41 and the trim 42 by an integral foam molding method. The present invention is not limited to covering the pad material 41 with the trim 42, but the headrest body may be formed only from the pad material 41, and the obtained headrest body may be covered with the trim later. In this case, only the frame 2 is loaded in the lower mold 51 without loading the trim 42, the cavity 53 is closed by the upper mold 52, and then the foamable synthetic resin raw material is loaded in the cavity 53. Since the periphery of the opening 27 of the second pole support portion 23 is in close contact with the back surface of the upper mold 52, the foamed resin does not enter the pole mounting space 26 during the foaming process, and enters the pole mounting space 26 of the foamed resin. The intrusion does not hinder the change of the attitude of the frame 2.

(2) In the above embodiment, the moderating projection 27a for obtaining a moderating feeling is provided on the inner wall surface of the opening 27 of the pole support portion 23. Such moderating projection 27a is provided. This is not essential, and may not be particularly provided.

(3) In the above embodiment, the pole support portion 23 and the pole mounting space 26 formed in the pole support portion 23 are formed in a fan shape that expands downward in a side view. The pole support portion 23 and the pole mounting space 26 are not limited to being formed in a sector shape, but may have a rectangular shape or another shape as long as the frame 2 can swing around the horizontal axis 29. It may be.

(4) In the above-described embodiment, the peripheral portion around the opening 27 of the pole support 23 is set to be flush with the same plane. However, in the present invention, the surface around the opening 27 is flush with the plane. It is not limited to being set to one state, but may be a curved surface. However, when forming a curved surface around the opening 27, it is preferable that the back surface of the upper die 52 also has a curved surface corresponding to the curved surface, thereby preventing the foam from entering the pole mounting space 26 during the integral foam molding process. can do.

[0034]

According to the headrest swing structure of the first aspect of the present invention, the frame embedded in the pad material has a pole mounting space having an opening at the bottom, and the pole has a pole mounting space at the base end side. Since the headrest is mounted on the top of the seatback via the pole, it can swing around the horizontal axis because it is pivotally supported by being fitted into the By pressing the head against the headrest, the headrest swings about a horizontal axis, whereby the headrest can always be set to an optimal angle.

Since the pole supporting member is housed in the pad material, it cannot be seen from the outside, so that the appearance of the headrest can be made simple and unobtrusive.

According to the swing structure of the headrest according to the second aspect of the present invention, the frame has the moderation member for giving a moderation to the swing of the pole on the inner peripheral surface of the pole mounting space. When the headrest swings, a moderation member can provide a moderation feeling.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a headrest to which a headrest swing structure according to the present invention is applied.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a view taken along the line B in FIG. 2; (a) shows a state in which a moderating projection of the first embodiment is formed in an opening of a pole support;
(B) shows a state in which the moderation protrusion of the second embodiment is formed.

FIG. 4 is a perspective view showing one embodiment of a method for manufacturing a headrest according to the present invention, and shows a state where a trim and a frame are loaded in a mold.

FIGS. 5A and 5B are perspective views illustrating a conventional headrest swing structure. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Headrest 2 Frame 21 Frame plate 22 Frame 23 Pole support part 24 Inclined wall 25 Side wall 26 Pole mounting space 26a Wide part 26b Narrow part 26c Shaft hole 27 Opening 27a Moderation projection 27b Moderation projection 27c Depression 28 Connection plate 29 Horizontal Shaft 3 Pole 31 Flat portion 32 Mounting hole 4 Headrest main body 41 Pad material 42 Trim 5 Die 51 Lower die 52 Upper die 53 Cavity 54 Raw material loading port 55 Fall prevention fitting

Claims (2)

[Claims] 1. A frame which is mounted on a pad made of a synthetic resin foam and a pole which is attached to the frame so as to be swingable relative to the frame. The pole is mounted on the top of a seat back. In the headrest swing structure thus configured, the frame has a pole support member at the bottom, and a pole mounting space that opens downward is formed in the pole support member, and the base end side of the pole is fitted into the pole mounting space. The swing structure of the headrest, wherein the pole is swingably supported. 2. The swing of the headrest according to claim 1, wherein the frame has a moderation member on the inner peripheral surface of the pole mounting space to give a moderation to the swing of the pole. Construction.