JP2863708B2 - Headrest - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headrest attached to an upper end of a seat back of a vehicle or the like.

[0002]

2. Description of the Related Art A foldable or fixed headrest is mounted on the upper end of a seat back of a vehicle or the like so as to obtain comfort. Such a headrest is manufactured by placing the base of a stay in a pillow-shaped sewing skin material, setting the stay in a foaming mold, and pouring foaming material from an injection port provided in the skin material to foam and harden. Or a product obtained by setting only the base of the stay in a foaming mold, pouring a foaming resin material, foaming and curing, and covering a skin material such as a fabric in a post-process on an integrally molded product taken out in a later step. Was.

[0003]

However, the conventional headrest has the following problems. The transport method of the headrest is the plastic cardboard packaging (Fig. 8).
However, during transportation, the stay 2 was already integrally fixed to the headrest base 1, so that the appearance of the package deteriorated and the transportation efficiency did not increase. Also, the stay 2 is carried from the stay maker to the molding maker,
This is integrated with the headrest base 1 by a molding manufacturer,
Although the finished product is further delivered to an assembly maker and assembled on a seat back, the molding maker does not create new value simply because the stay 2 is integrated with the headrest base 1. Conversely, since the delivery flow of the stay 2 takes a detour, the distribution cost of the product has been high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an assembling type headrest which simplifies a transportation route of a stay and eliminates an unpleasant appearance of a headrest to reduce distribution costs. Aim.

[0005]

In order to achieve the above object,
In the headrest according to the first aspect of the present invention, in the headrest including a pillow-shaped headrest base made of an expandable resin material and a stay having a substantially U-shape and having both legs and a connecting portion connecting these, the headrest base includes A receiving space which is opened from the end face toward the inside, and in which a stay can be inserted with the connecting portion at the head, and a holding space for accommodating the stay in a substantially U shape around the periphery of the receiving space, and In a boundary area between the holding space for accommodating the connecting portion and the receiving space, a separation preventing rib is formed on an opposing opening wall surface, and a plurality of dividing notches for dividing the separation preventing rib are provided. Here, “in a substantially U-shape” means that the two legs and the connecting portion have a substantially U-shape in plan view, and the substantially U-shape means that the two legs are parallel to each other within the headrest base. The case where the part is shifted in a U shape is also included. The phrase “substantially U-shaped” has the same meaning. The headrest according to the second aspect of the present invention is the headrest according to the first aspect, wherein the slip-off preventing rib on the receiving space side has a gentle slope. The term "gently inclined surface" means that the elevation angle or depression angle of the inclined surface formed by the slip-off prevention rib is 10 degrees to 6 degrees.
It refers to one in the range of 0 degrees. Further, the headrest according to the third aspect of the present invention is the headrest according to the first aspect or the second aspect, wherein anti-sway ribs are provided on opening wall surfaces opposed to each other in a boundary area between the holding space for accommodating both legs of the stay and the receiving space. Is formed.

[0006]

According to the headrest of the first aspect of the present invention, when the stay is inserted into the receiving space of the headrest base and further pushed in, the stay is provided with the same holding space around the periphery of the receiving space. It is housed and held in the holding space. The stay connecting portion inserted at the head is inserted into the holding space by pushing and expanding the stopper rib. And, since a stopper rib is formed in the boundary area between the holding space and the receiving space, once the stay is settled in the holding space, the stay is easily fixed and held, and the stay is pulled out of the holding space. Is blocked. On the other hand, since the cutout preventing rib is formed with a dividing notch for dividing the rib, the stay is relatively easily pushed and expanded when the stay is inserted into the holding space.
The stay can be inserted smoothly.

In the headrest according to the second aspect of the present invention, since the slip-off preventing rib according to the first aspect of the present invention forms a gentle slope on the receiving space side, the slip-out preventing rib can be more easily expanded by the stay connecting portion. As a result, the stay can be easily inserted into the headrest base. Further, when the anti-sway ribs are formed as in the third aspect of the invention, the stay legs inserted into the holding space are prevented from being displaced in the left-right direction, and the stay after insertion and the headrest base are completely integrated. I will be.

[0008]

The present invention will be described in detail below with reference to embodiments. 1 to 7 show one embodiment of a headrest according to the present invention. The headrest is of an assembling type, and the headrest base 1 and the stay 2
Consists of In the present embodiment, a method is used in which a foamed molded product of only the headrest base 1 is produced, and a skin material (not shown) is later put on the foamed molded product.

The headrest substrate 1 is obtained by injecting a foaming material into a foaming mold and foaming and hardening it into a pillow shape.
As foaming raw materials, in addition to liquid urethane and chip urethane,
Polyolefin resin foam beads such as polyethylene and polypropylene and polystyrene resin foam beads are used, and the headrest base 2 is made of a foamable resin material. Among them, it is more preferable to use polypropylene-based or polyethylene-based resin foam beads. Bending strength,
This is because the tensile strength and the like are large, and the stay 2 fitted to the headrest base 1 is difficult to fall off.

In the headrest base 1, a receiving space 1a is opened in a base end face 1d on the side attached to the upper end of the seat back (FIG. 1). The receiving space 1a is flat, provided at a substantially central position of the base end face 1d, and reaches a predetermined depth into the headrest base 1 (FIG. 2). On the base end face 1d of the headrest base 1, holding spaces 1b each having a circular cross section are opened at both side edges of the receiving space 1a, and extend into the headrest base 1 to the same depth as the receiving space 1a. Further, in the boundary area between the receiving space 1a and the holding space 1b, the opening wall surface protrudes and the anti-vibration ribs 14 and 15 are provided. Upper and lower anti-vibration ribs 14, 1 protruding from each opening wall surface
Numeral 5 suppresses the lateral displacement of the legs 21 that are inserted into the headrest base 1 in close proximity to each other. An auxiliary groove 16 having a constant width is provided on the outer edge of the holding space 1b and extends horizontally along the outer edge. This is because when the stay 2 is inserted into the headrest base 1, a small force is required. Note that the auxiliary groove 16 may not be provided when the headrest base 1 is rich in flexibility (easily elastically deformed).

The stay 2 is formed by bending a circular pipe material into a U-shape and includes left and right legs 21 and 21 and a connecting portion 22 for connecting these. Both legs 21 and 2 of stay 2
The position of 1 corresponds to the position of the holding space 1b, and the diameter of the holding space 1b is substantially equal to the diameter of both legs 21. Both legs 21, 21 have their tips inserted into the upper end of the seat back,
The headrest is to be attached. Here, the shape of the stay 2 is simply represented by a U-shape. However, when viewed from the side, the actual stay 2 is inclined slightly forward to the head side of the person sitting on the seat, The two legs 21 and 21 which were in a parallel state are shifted in a "C" shape in a portion which has entered the headrest base 2 of FIG. In addition, the connecting portion 22 is made by bending a metal pipe, but the connecting portion 22 may be any as long as it connects the two legs 21 and 21.
For example, it may be a plate-like body. When the connecting portion 22 of the stay is pushed into the receiving space 1a of the headrest base 1 as shown by the arrow in FIG. 1, the anti-vibration ribs 14 and 15 are pushed out and the left and right legs 21 are respectively inserted into the left and right holding spaces 1b. Enter (Fig. 2). At this time, each holding space 1b is expanded and deformed by the auxiliary groove 16, so that the leg portion 21 can smoothly enter.

At the deepest part of the receiving space 1a, a holding space 1c having a circular cross section communicating with the left and right holding spaces 1b is formed on the outer peripheral edge thereof as shown in FIG.
Holding spaces 1b and 1c for accommodating the stay 2 are formed in a substantially U-shape having the same shape as that of the stay so as to surround the periphery of a. The diameter of the holding space 1c is also substantially equal to the diameter of the connecting portion 22 of the stay 2. Further, in the boundary area between the holding space 1c and the receiving space 1a, the opening wall faces facing up and down project so that the ribs 11 to prevent the falling-off are provided.
12 is formed. On the outer edge of the holding space 1c as well,
An auxiliary groove 17 extending at a constant width in the horizontal direction is provided.

When the stay 2 is further pushed inward from the state shown in FIG. 2, the connecting portion 22 of the stay 2
While the opening 7 is being expanded, the slip-off preventing ribs 11 and 12 are pushed and expanded to enter the holding space 1c, and the stay is accommodated and held in the holding space 1c (FIGS. 3 and 4). . In such a state, the lateral runout of the stay 2 is restricted by the runout prevention ribs 14 and 15, and the stay 2 is prevented from coming off by the runoff prevention ribs 11 and 12.

As shown in FIG. 4, the slip-off preventing ribs 11, 12 are spaced apart from each other in the longitudinal direction.
A dividing notch 13 that divides 12 is provided. The details are shown in FIGS. FIG. 5 shows the stopper ribs 11 and 1.
2 is an enlarged front view, and FIGS. 6 and 7 are VI-VI of FIG. 5, respectively.
FIG. 7 is a cross-sectional view taken along line VII-VII.

Since the headrest substrate 1 is required to have cushioning properties, polyolefin resin foam beads such as polypropylene (for example, trade name "Kaneka Eperan PP45", manufactured by Kaneka Corporation) are frequently used. However, when such a material is used to form the above-described slip-prevention rib, the rib is easily damaged. This is because, during foam molding, beads are difficult to fill up to the tip of the ribs 11 and 12, which tend to cause poor filling and poor fusion, and a reduction in fusion strength. Therefore, in order to prevent the detachment prevention ribs 11 and 12 from being damaged by the impact applied from the stay 2, it is conceivable to lower the rib height, but the detachment prevention function is reduced. To solve this,
Even if it is attempted to increase the rib length to enhance the slip-out prevention function, there is a limitation because the length of the connecting portion 22 of the stay 2 is determined.
It is conceivable to increase the rib thickness by increasing the rib thickness. However, according to this method, the resistance to the expansion deformation at the time of the stay insertion is increased, and a situation in which the stay 2 cannot be smoothly inserted is caused. become.

Such a situation is solved by forming the cutout notch 13 in the slip-off preventing ribs 11 and 12. That is,
As shown in FIG. 5, a notch 13 having a constant width L2 and a constant depth L3 at equal intervals L1 in the longitudinal direction of the slip-off preventing ribs 11 and 12.
Is formed to divide the escape prevention ribs 11 and 12. By dividing, the individual stopper ribs 11 and 12 are easily elastically deformed, and even if the rib thickness (L5 in FIG. 6) is increased,
The expansion deformation when the stay connecting portion 22 is inserted is performed without increasing the resistance. Specifically, the rib thickness L5
In the case where the cutting notch 13 is not provided, a portion that could only be taken at most 4 mm can be taken to be 8 mm or more, thereby enabling the work 2 to be smoothly inserted. By the way, 10mm
The following is an example of the dimensions of each of the detachment prevention ribs 11 and 12 when the stay 2 is formed from a φ pipe material. L1 = 10 mm, L2 = 6 mm, L3 = 3 mm, L4
= 3 mm, L5 = 10 mm, L6 = 12 mm, L7 = 3
mm, L8 = 2 mm, φ1 = 10 mm Here, the length L1 of the divided separation prevention ribs 11 and 12
Is preferably 10 mm or more in order to ensure the function of preventing detachment. If the length is shorter than this, the detachment prevention effect will be weakened. The number of the cutouts 13 may be appropriately changed depending on the diameter of the stay 2, the rib thickness L5, the rib interval L2, and the like, but it is preferable to provide three or more. This is because the degree of freedom of each of the divided separation prevention ribs 11 and 12 is increased, and also, even if one of the separation prevention ribs is broken, the remaining ones exert a force capable of reinforcing. The depth L3 of the dividing notch 13 is selected according to the shape of the slip-off preventing ribs 11 and 12, and the depth L3 is more preferable.

Also, as shown in FIGS. 6 and 7, the inclined surfaces 11a, 11a of the slip-off preventing ribs 11, 12 facing the receiving space 1a.
12a has a gentle gradient (here, about 30 degrees), and smoothly guides the insertion of the stay connecting portion 22 into the holding space 1c (from the right to the left in FIG. 6). Slope 11
a and 12a are preferably in the range of 10 to 60 degrees, more preferably in the range of 20 to 45 degrees. Inclined surfaces 11a, 12
If the angle a is too large, the feeling of resistance when the stay is inserted increases, while if the angle of the inclined surface is too small, the production of the headrest base 1 is hindered. On the other hand, the wall surfaces 11b and 12b of the retaining ribs 11 and 12 facing the holding space 1c are
In order to form the holding space 1c having a circular cross section, it is a steeply curved arc surface. This is for fitting and securely holding the stay connecting portion 22 inserted.

In this embodiment, as described above, a method is employed in which the bare headrest base 1 having no covering of the skin material is formed by foam molding, and then the skin material is applied later. However, the skin material only needs to be attached to the headrest, which is the final product, and it does not matter whether the skin material is attached to the headrest base 1 at the time when the stay 2 is inserted into and integrated with the headrest base 1. .

The headrest constructed as described above can adopt an assembling method of the headrest base 1 and the stay 2, and each has a structure that can be assembled at the final stage. Therefore,
The molding maker can deliver the headrest base 1 or the headrest base 1 to the assembly maker in a form in which a skin material is applied to the headrest base 1, and the packing is improved and the transportation efficiency is improved. Since the slip-off preventing ribs 11 and 12 on the receiving space 1a side have gentle slopes 11a and 12a, the receiving space 1a is formed through the receiving space 1a formed in the headrest base 1.
The stay 2 can be smoothly inserted into the holding spaces 1b and 1c formed on the periphery of the stay. In particular, the above-mentioned detachment prevention ribs 11,
By forming the cut-out notch 13 in the stopper 12, even if the rib thickness is increased to some extent, the slip-off preventing ribs 11 and 12 retain elastic deformation and increase the strength to avoid breakage, thereby facilitating the work of attaching the stay 2. Become. Further, since the headrest base 1 is provided with the slip-off preventing ribs 11 and 12 and the run-out preventing ribs 14 and 15, the stay 2 is integrated once it is inserted and accommodated in the headrest base 1, and the stay 2 is integrated with the headrest base 1. It is hard to get out of the way, and there is no rattling on the left and right.

In the present invention, the present invention is not limited to the above-described embodiment, but can be variously changed within the scope of the present invention depending on the purpose and application. Headrest base 1, stay 2, receiving space 1a, holding spaces 1b, 1c, pull-out prevention ribs 11, 1
2. The shape, size, material, etc. of the cutout notch 13, the anti-vibration ribs 14, 15 and the like can be dealt with according to the purpose without being limited to this embodiment. The anti-sway ribs 14, 15 may be formed on a part of the opening wall along the holding space 1b.
In the embodiment, the fixed headrest is described. However, the present invention can be applied to a reachable headrest.

[0021]

As described above, the headrest of the present invention can be easily assembled by supplying the headrest base and the stay, each manufactured by a part maker, to the assembly maker through a different route, so that the headrest can be mounted twice. Improving the shape of the transport and the conventional headrest, and contributing to a reduction in logistics costs. Furthermore, the headrest base and the stay thus assembled are completely integrated by the slip-prevention ribs and the run-out prevention ribs, and the slip-out and lateral shake are achieved. Can be eliminated, and an excellent effect is exhibited.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a headrest base and a stay before assembly.

FIG. 2 is a cross-sectional view showing a state in which a stay is inserted into a headrest base.

FIG. 3 is a longitudinal sectional view of the headrest with a stay attached.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is an enlarged view of a portion A in FIG. 4;

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a view showing a package when a conventional headrest is carried.

FIG. 9 is a view showing a package when a conventional headrest is carried.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 headrest base 1a receiving space 1b, 1c holding space 1d base end face 11, 12 slip-off preventing rib 11a, 12a inclined surface 13 cutout cutout 14, 15 run-out preventing rib 2 stay 21 leg 22 connecting part

Continued on the front page (72) Inventor Haruo Morita 8-1, Tocho, Fujii-cho, Anjo-shi, Aichi Pref. INOAC CORPORATION Sakurai Office (56) References Real Opening Sho 61-13649 (JP, U) Real Opening Akira 62-157455 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47C 7/38 B60N 2/48

Claims (3)

(57) [Claims] 1. A headrest comprising a pillow-shaped headrest base (1) made of a foamable resin material, and a stay (2) having a substantially U-shape and having both legs and a connecting portion connecting them, wherein the headrest base ( 1) is a receiving space (1a) which is opened inward from the base end face thereof and into which a stay can be inserted with the connecting portion at the head, and a holding space which accommodates the stay in a substantially U-shape around the periphery of the receiving space. (1b, 1c)
And at the boundary between the holding space (1c) for accommodating the connecting portion of the stay and the receiving space (1a), slip-off preventing ribs (11, 12) are formed on opposing opening wall surfaces, Furthermore, the cutout notch (1
A headrest characterized in that a plurality of items 3) are provided. 2. The slip-off preventing rib (11,
2. The headrest according to claim 1, wherein the first and second surfaces form gentle slopes. 3. A boundary area between a holding space (1b) for accommodating both legs of the inserted stay and the receiving space (1a),
3. The headrest according to claim 1, wherein run-out preventing ribs (14, 15) are formed on opposing opening wall surfaces.