JPH04352905A - Head rest having hetero-hardness - Google Patents

Abstract

PURPOSE:To provide a head rest free from a crack at the corner of a gap between a soft urethane section and a body urethane section constituting the head rest, when a cover is applied thereto or even an external force acts thereupon. CONSTITUTION:A soft urethane section 11 is laid within a recess 13 formed in a body urethane section 12, so that the side of the section 11 forms a gap 14 with the side wall 13b of the recess 13. The bottom 13a of the recess 13 in the section 12 is solidified with the side of the soft urethane section 11 in contact therewith via an impregnation process. Also, a plurality of joint pieces 15 projected from the body urethane section 12 and solidified with the soft urethane section 11 via an impregnation process are arranged at suitable intervals in the gap 14 between the side wall 13b of the recess 13 and the side of the soft urethane section 11.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headrest with different hardness for use in automobiles and the like.

0002

2. Description of the Related Art Conventionally, a soft urethane portion 31 and a main body urethane portion 32 are formed as shown in FIGS. When manufacturing the headrest 30 in which 33 is formed, the split molding mold shown in FIG. 7 is used.
A partition plate 36 is erected on a lower mold 35 as shown in FIG.
A partition frame 37 surrounding 31d is formed, and this partition frame 37
The soft urethane part 31 is fitted inside, and then the lower mold 35 is inserted.
An upper mold (not shown) is placed on top of the upper mold, and the main body urethane portion 3 is placed inside the mold.
The urethane material No. 2 was injected and foamed, and the soft urethane portion 31 was impregnated and solidified. The headrest 30 thus formed has a gap 33 between the soft urethane portion 31 and the main body urethane portion 32, as shown in FIG.

0003

However, if the headrest 30 has a gap 33 around the soft urethane portion 31 as shown in FIG. When external force F acts in the direction of the arrow, cracks may occur in the corner portion 33a of the gap 33.

[0004] This invention prevents cracks from occurring at the corners of the gap between the soft urethane portion and the main body urethane portion even when a cover is placed over the headrest or when an external force is applied in the direction of the arrow shown in FIG. Our goal is to provide a headrest that does not cause any problems.

[0005]

[Technical Means for Solving the Problems] In order to solve the above problems, the headrest of the present invention includes a soft urethane part in a recess provided in the main body urethane part, and a gap is formed between the side surface of the soft urethane part and the wall surface of the recess. The bottom surface of the concave portion is impregnated and solidified on the contact surface of the soft urethane portion that comes in contact with the bottom surface of the concave portion, and the soft urethane portion extends from the main body urethane portion into the gap between the wall surface of the concave portion and the side surface of the soft urethane portion. It has a structure in which a plurality of bonding pieces impregnated and solidified are arranged at appropriate intervals.

[0006]

[Operation] The soft urethane part of the headrest and the urethane part of the main body are connected in the gap between them by multiple joint pieces extending from the urethane part of the main body, so it is difficult to cover the headrest or apply external force to it. No cracks will occur at the corners of the gap.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to FIGS. 1 to 4 showing examples together with a mold used for carrying out the invention. The headrest 10 is composed of a soft urethane portion 11 and a main body urethane portion 12. A rectangular recess 13 is provided in the main body urethane portion 12, and the bottom surface 13 of the recess 13
In a, a rectangular soft urethane portion 11 is formed on the wall surface 1 of the recess 13.
3b with a gap 14 of a predetermined size in between. Therefore, the planar shape of the gap 14 is rectangular. The bottom surface 13a of the recessed portion 13 is impregnated and fixed to the surface of the soft urethane portion 11 that is in contact with the bottom surface 13a. Soft urethane part 1 in gap 14
1 and the main body urethane portion 12.
are installed horizontally at a predetermined pitch. The joint piece 15 is formed by extending the main body urethane portion 12 and impregnating and fixing it to the soft urethane portion 11.

As described above, in this headrest 10, the soft urethane portion 11 and the main body urethane portion 12 are connected by a plurality of joint pieces 15, so even if the headrest 10 is covered with a cover or an external force is applied, Since stress is not concentrated on the corner 14a of the rectangular gap 14, the corner 1
No cracks occur in 4a.

Next, the mold 20 for the headrest 10 will be explained. The mold 20 is divided into a lower mold 21 and an upper mold 2.
It consists of 9. The lower mold 21 is rectangular and has a rectangular partition frame 23 inside thereof with a partition plate 22 parallel to the side wall 24.
is formed. The partition plate 22 is not continuous, but is cut into predetermined dimensions at a predetermined pitch. In other words, they are arranged intermittently. After the rectangular soft urethane portion 11 is inserted and positioned within the partition frame 23, the upper mold 29
is stacked on the lower mold 21, and the urethane material that will become the main body urethane portion 12 is placed in the space 2 formed by the upper mold 29 and the lower mold 21.
When injected into the urethane material 5, the urethane material foams to form the main body urethane portion 12. At this time, the main urethane portion 12 is placed on the upper surface of the soft urethane portion 11 {in FIGS. 6(a) and 6(b)}
Then, the cut portion of the partition frame 23 is extended and the side surface of the soft urethane portion 11 is impregnated and solidified as shown in FIG.

FIG. 4 shows another example in which the partition plate 22 is cut into a sawtooth shape. In this case, the joining pieces 15 pass through the spaces between the saw teeth and are arranged along the gaps 14 at the pitch of the saw teeth.

[0011]

Effects of the Invention: As described above, in the headrest of the present invention, the soft urethane portion and the main body urethane portion are connected by a plurality of joint pieces arranged at intervals, so that it is possible to cover the headrest with a cover or apply external force. Even if stress is applied, stress will not be concentrated at the corners of the gap between the soft urethane portion and the main body urethane portion, so no cracks will occur at the corners.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a headrest of one embodiment.

[Figure 2] (A) is a sectional view taken along line A-A in Figure 1, (B) is Figure 1
FIG.

[Fig. 3] (A) is a sectional view of the mold corresponding to the sectional view taken along the line AA in Fig. 1, and (B) is a sectional view of the mold corresponding to the part taken in the sectional view taken along the line BB in Fig. 1. It is a diagram.

FIG. 4 is an explanatory diagram showing another example of the partition frame of the lower mold of the mold.

FIG. 5 is a perspective view of a conventional headrest.

FIG. 6 is a sectional view of main parts of a conventional headrest.

FIG. 7 is a sectional view of the lower mold of a conventional headrest mold.

FIG. 8 is a cross-sectional view when an external force is applied to a conventional headrest.

[Explanation of symbols]

10 headrest, 11 soft urethane portion, 12 main body urethane portion, 13 recess, 13a bottom surface, 13b wall surface, 14 gap, 15 joint piece

Claims (1)

[Claims] Claim 1: A soft urethane part is arranged in a recess provided in the main body urethane part so that a gap is formed between the side surfaces of the soft urethane part and the wall surface of the recess, and the bottom surface of the recess is arranged in a manner that the soft urethane part is in contact with the wall surface of the recess. The contact surface is impregnated and solidified, and a plurality of bonding pieces extending from the main body urethane part and impregnated and solidified in the soft urethane part are arranged at appropriate intervals in the gap between the wall surface of the recess and the side surface of the soft urethane part. Headrest with different hardness.