JPS6060815A - Headrest and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a headrest and a method for manufacturing the same.

In order to ensure the safety of the driver's or passenger's neck, a headrest is attached to the upper part of the backrest of the seat, and a large transparent lens is installed in the center of the headrest to prevent the rear field of view from being narrowed due to the presence of this headrest. A new window and a closed headrest have been proposed and have been well received.

However, providing this see-through window complicates the manufacturing process of the headrest, and there is a risk that the red rest itself may be weakened.

The headrest according to the present invention has a reinforcing bridge attached across the center of a large transparent window in the center of the main body of the red rest. To explain, head Renu)
In (1), a rectangular core frame (2) is formed by bending a bar, and both end extensions of the core frame (2) extend downward to form a pair of stays (8) (8). Further, a single crosspiece (4) is extended across the center of the rectangular core frame (2) to form a core body (5) of the headrest. The core frame (2) including the crosspiece (4) and a part of the stay (3) are covered with elastic foam (6) around the core.
The outer surface of the elastic foam is covered with a skin layer (7
), and below the headrest main body (8), which has a core frame (2) embedded in its center, is the core (5).
A pair of stays (3) and (8) forming a part of the headrest form a headrest mounting leg, and a bridge (9) embedded in the center of the headrest main body (8) around the crosspiece (4). Two large viewing windows 00 divided by
0 is formed.

As shown in Fig. 1, this bridge (9) may be perpendicular to the window opening in the headrest body (8), and two transparent windows may be provided on the left and right sides of the bridge (9). It is also possible to extend the bridge horizontally and open two viewing windows above and below the bridge (9) (Figure 2).

This large window section can be made tougher by placing a bridge (9) that divides the window section in the center, and this also impairs the original effect of the see-through headrest. Not at all.

By arranging the bridge in the see-through window provided in the main body of the headrest, it becomes extremely easy to manufacture an annular headrest with this kind of core inside, and it also produces excellent quality effects. This brought about disastrous results.

Next, we will explain the manufacturing method of a headrest in which the bridge part is attached to the central part of the see-through window.First of all, in a headrest with one large see-through window in the center of the conventional headrest, first of all, A hollow skin body of an annular body with a core inside is manufactured by known blow molding, and then the hollow skin body is taken out from the mold, and the foaming stock solution injection hole 0C is positioned on the upper side as shown in Fig. 3. When a foaming solution such as polyurethane foam is injected through the injection hole, the foaming solution flows in the left and right directions as shown by the arrows in the figure, and the foaming solution flows into the center of the lower side of the annular skin body. The gaseous body containing air that merges and is pushed from the back by the undiluted solution in the confluence zone and loses a place to escape and remains,
Air pockets were generated in the measuring section, and the resulting headrest had a locally weakened part, which could result in a defective product that would reduce the product's value by half.

In this invention, a bridge section is provided in the center of the see-through window of the headrest main body, and this bridge section is actively used as a flow path for the foaming solution, thereby preventing the air pocket 9 from occurring. A specific method for manufacturing the above-mentioned headrest will be explained with reference to the drawings.

First, as shown in FIGS. 4 and 5, an annular hollow body in which a core body (5) forming the skin layer (7) of the headrest (1) is housed is assembled into a die (11) of an extruder. ) The tip of the approximately semi-cylindrical parison θ made of vinyl chloride or ABS resin is the die θ1)
A pair of rod-shaped members initially positioned directly below are held in an extended state in a flat plate shape by a gripping member 03 assembled with a predetermined gap.

Next, the gripping member 0 which held the parison in an expanded flat plate shape was moved on the same level plane as indicated by the arrow in FIGS. 4 and 5, and the parison was continuously pushed out. It hangs down in a U-shape due to its own weight, creating a large space α between a pair of facing parison walls.
4) is formed.

In addition, instead of moving the gripping member (13) on the same level plane, the gripping member 0 east located directly below the die 01 of the extruder is moved to the desired expanded shape of the parison with extrusion of the parison ('12). It is also possible to form a space 04) between a pair of facing walls of the parison by moving it in a U-shape according to the trajectory of the parison.

Next, bend a wire, such as a metal rod, into a rectangular shape and create a core frame (
2), a crosspiece (4) is spanned across the center of the core frame (2), and a pair of stays (4) are connected to the extension of the core frame (2).
8) Core body (5) formed by connecting (8) to core frame (2)
in the direction of the arrow in Fig. 5, and move the core frame (2) part to U.
The half-split mold 000 is placed in a fixed position in the space 04) of the U-shaped parison α, and the half-split molds 000 are located on both sides of the U-shaped parison α, facing both outer walls of the parison. Parts of the core frame (2) and the pair of stays (3) fit into the side inner surface of the mold α0, and the core frame (2)
A semi-annular groove sufficiently larger than the radius of the metal rod constituting the core frame (2) and the stay (3) is carved therein, and a nozzle for injecting compressed air is provided in the semi-annular circumferential groove αη that matches the shape of the core frame (2) and the stay (3). A semi-circular guide groove (α), which serves as the mouth, is connected in series.

The half-split molds are heated to about 40 to 60°C, and the pair of molds oaaa sandwich the parison Q with the core (5) sandwiched between them from both sides and close the lid. By closing, the semi-annular circumferential groove 0η and the guide groove α8) are combined to form a substantially cylindrical groove, and from this guide groove, for example, a blowing nozzle connected to an air cylinder is inserted, and the parison 04
Compressed air of 1 to 6 kg/cA is injected into the mold to expand and bring the parison into close contact with the circumferential groove of the mold.

Then, after a cooling process, the half-split mold uQα is opened to take out the annular hollow body in which the core body serving as the skin of the headrest is housed, and the edge portion existing around the hollow body is removed.

The annular hollow body (outer skin of the headrest) in which the core is housed is inserted into a cylindrical parison which has one slit extruded from the goose of an extruder. After inserting the core frame part with the crosspiece in the center, molding with a half-mold mold is done by work, or by extruding a pair of band-shaped parisons facing each other from the extruder die, It is also possible to insert a core frame portion in which the crosspiece in the core body is arranged in the center, and perform molding using a rear mold.

The skin body (annular hollow body) (7a) of the headrest with the thus obtained core inside is fitted into a mold for foam molding for shape retention, and the hollow skin body (7a) is inserted into the hollow grate part (9a). ) is positioned vertically, and the bridge part (
From the injection hole 0 [phase] which is opened in the upper part of 9a) and located in the lower surface part of the headrest 1 body (it is desirable to use the pressurized air injection hole during the blow molding), polyurethane resin, etc. The foaming stock solution is first poured into a hollow bridge (9
a), and the foaming stock solution first flows down the hollow bridge (9a) as shown by the arrow in the figure, and then flows through the lower end of the branch (9a).
B), the liquid is divided into both left and right directions, and the stock solution is passed through the hollow epidermis (
7a) While pushing up the air inside from the back, it rises inside the hollow body without merging at a certain point and is uniformly dispersed inside the body, injecting about 70 to 80% of the volume of the foaming stock solution into the hollow skin body. Once the foaming reaction has finished, the gas generated by the foaming reaction is pushed up north and discharged to the outside through the stock solution injection hole 01, and at the same time, the remaining part inside the skin body is filled with a foam layer (6) due to the reaction of the foaming stock solution. be done. By locating the foaming stock solution injection hole Oe on the bottom of the headrest body (8), more specifically between the pair of stays, even if the foam (6) comes out from the injection port 0 [phase]. The appearance of the headrest main body is not significantly impaired.

Of course, as illustrated in FIG. 2, the hollow bridge portion (9a)
When the headrest 1 is arranged horizontally in the main body of the headrest 1, a foaming stock solution inlet can be formed in the side surface of the headrest main body (8).

In this invention, a hollow bridge part (9a) is provided across the center of the large window part of the annular hollow skin body (7a).
), first, the foaming stock solution is injected and allowed to flow down into this hollow bridge part (9a), and the stock solution forms a distribution channel so that residual and generated gases can always be pushed up toward the injection port Q [phase] from behind, Since we were able to divide the flow so that the raw solution does not merge in one place, we can prevent the formation of gas pockets in the skin, and we can also reliably eliminate the residual gas caused by the foaming reaction. It becomes possible to uniformly fill the inside of the body with foam, and the resulting headrest also becomes highly safe.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a headrest embodying the present invention, Fig. 2 is a view corresponding to Fig. 1 showing another embodiment, and Fig. 3 is an explanatory diagram of a conventional henorest structure. FIG. 5 is an explanatory diagram showing the manufacturing process of an annular hollow body DOv with a core frame inside, and FIG. 6 is an explanatory diagram showing the flow of the foaming solution during the headrest manufacturing process according to the present invention. In the figure, (1) is the headrest, (2) is the core frame, (8) (
8) is steel, (4) is a crosspiece, (5) is a core body, (6) is an elastic foam, (7) is a skin layer, (7a) is a hollow skin layer, (8) is a headrest body, (9) is a bridge, (9
a) is a hollow bridge part, (10 (10 is a window, (+1)
Hagui, (1″; 4 haha + J soy, 0 → ha space, θ
$(mi is a half-split mold, Oη is a semi-annular circumferential groove, (g) is a semi-annular guide groove, and 01 is an injection hole for the foaming stock solution. Patent applicant: Mitsuboshi Belting Co., Ltd. Agent Oka 1) Shuji Figure 1) Figure 7 Figure 2 Figure 3 Ward 4 Figure 5 Figure 6

Claims (2)

[Claims] (1) A rod-shaped core is embedded in the center of the annular elastic foam,
A headrest main body is formed by covering the entire surface of the elastic foam with a skin layer, a part of the rod-shaped core is extended to the lower surface of the main body to form a leg, and a see-through window is provided in the headrest main body. A headrest in which a bridge with a rod-shaped core body arranged in the center is arranged across the center of the window. (2) A bar is placed in the center of a core frame formed by bending a bar into a rectangular shape between the walls of the parison, which is extruded into a belt shape from the die of an extruder and forms a pair of facing walls. A pair of half-split molds placed on both sides of the parison are then closed to produce an annular hollow body with the core frame inside. A method for manufacturing a headrest by injecting and flowing a foaming solution from above a bridge part.