JP2008119314A - Core material for head-rest and head-rest - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core material for a head-rest which can be restrained from turning around an installation portion of a head-rest stay, and a head-rest. <P>SOLUTION: The core material 24 is integrally formed by blow molding. The rear side of the core material 24 is formed with a storage groove 26 to store the upper end of the head-rest stay 23. The storage groove 26 is provided with a support portion 26a turnably supporting the installation portion 23a of the head-rest stay 23 and a pair of leg storage portions 26b storing leg portions 23b of the head-rest stay 23. The leg storage portions 26b are formed so as to have a depth allowing the leg portions 23b to incline. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a headrest mounted on a backrest portion of an automobile seat, and more particularly to a headrest core member embedded in a pad and a headrest provided with the headrest core member.

  Conventionally, as this type of headrest core material and headrest, for example, a structure as disclosed in Patent Document 1 has been proposed. That is, in the headrest 41 having the conventional configuration described in Patent Document 1, a hard headrest core material 44 (hereinafter referred to as a core material 44) is provided at the upper end of the headrest stay 43 as shown in FIGS. 11 to 13. It is attached. Pads 45 made of foamed resin are filled in the bag-like skin 42 so as to embed the upper ends of the core material 44 and the headrest stay 43.

The headrest stay 43 is formed in a substantially inverted U shape in a front shape so as to have an erection portion 43a and a pair of leg portions 43b. The core member 44 is formed in a hollow shape by blow molding of a synthetic resin so as to have a main body portion 44a and a narrow attachment portion 44b protruding downward. Further, the core member 44 is rotatably supported by the erection part 43a of the headrest stay 43 in a bearing part 44c penetrating the inside and outside of the wall part on both sides of the attachment part 44b. In the headrest 41, the rear core acting on the occupant's head can be received by the hard core member 44, the occupant's head can be held, and the pad 45 can be swung. Permissible.
JP-A-8-252146

  However, in the conventional headrest 41 of Patent Document 1, when a heavy load is applied to the headrest 41 in the event of a vehicle collision or the like, the core member 44 pivots rearward largely about the installation portion 43a of the headrest stay 43. May end up. For this reason, there is a problem that a means for limiting the rotation of the core member 44 is required.

  Further, when the core material 44 is blow-molded, the parting line of the blow-molding die is positioned on the erection portion 43 a of the headrest stay 43. For this reason, this installation part 43a may be pinched and damaged by the parting line part of the mold. Furthermore, since the attachment portion 44b is narrow, excess portions of the parison are formed on both sides of the attachment portion 44b. Therefore, a burr 44d indicated by a two-dot chain line in FIG. 12 is formed around the erection part 43a along the erection part 43a due to an excess portion of the parison, and an extra man-hour is required to remove the burrs 44d. It was.

  Furthermore, since the bearing portion 44c penetrating the inside and outside of the wall portion of the core member 44 is formed, it is from between the outer peripheral surface of the erection portion 43a of the headrest stay 43 and the inner peripheral surface of the bearing portion 44c of the core member 44. The elastic foam material constituting the pad 45 may enter the core material 44. In such a case, a low density portion that causes a defect is formed in the pad 45 around the intrusion site.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose of the headrest core material and the headrest is to suppress the headrest core material from rotating around the headrest stay construction part even when a heavy load is applied to the headrest in the event of a vehicle collision or the like. Is to provide.

  In order to achieve the above object, the invention relating to the core material for the headrest is characterized by being blow-molded and having an accommodation groove for accommodating the upper end portion of the headrest stay on the rear surface.

  Therefore, according to the headrest core material of the present invention, the upper end portion of the headrest stay is housed and held in the housing groove on the rear surface of the headrest core material even when a heavy load is applied to the headrest during a vehicle collision or the like. . Therefore, unlike the conventional configuration, it is possible to suppress the headrest core member from rotating about the erection portion of the headrest stay. Further, since it is not necessary to provide a narrow mounting portion on the headrest core material, there is no problem of burrs that require removal. In addition, since a bearing for inserting and supporting the erection portion of the headrest stay is unnecessary, the elastic foam material does not enter the core material from the bearing portion. Therefore, a low-density part is not formed and a high-quality headrest can be obtained.

  Further, in the above-described configuration, the housing groove includes a support portion that rotatably supports the erection portion of the headrest stay and a pair of leg housing portions that accommodate both the leg portions of the headrest stay, and each leg housing portion. It is good to comprise so that when the leg part is tilted by a predetermined angle based on the relative rotation of the erection part with respect to the core member, the leg part is deep enough to be kept in the accommodated state.

  Moreover, the invention relating to the headrest embeds the core material for the headrest having the above-described configuration, the headrest stay in which the upper end portion is accommodated in the accommodation groove of the core material, and the upper end portion of the core material for the headrest and the headrest stay. It is made up of pads.

  As described above, according to the present invention, even when a heavy load is applied to the headrest in the event of a vehicle collision or the like, it is possible to prevent the headrest core member from rotating about the construction part of the headrest stay. In addition, the manufacturing process can be simplified and a high-quality headrest can be obtained.

Below, 1st Embodiment of this invention is described based on FIGS.
As shown in FIGS. 1 and 2, in the headrest 21 of this embodiment, a pad 25 made of an elastic foam resin is filled and formed inside a bag-shaped skin 22.

  The headrest stay 23 is formed in a substantially inverted U shape so as to have a erection part 23a and a pair of leg parts 23b. A headrest core member 24 (hereinafter simply referred to as a core member 24) made of a hard synthetic resin material is attached to the upper end portions of the erection portion 23a and both leg portions 23b of the headrest stay 23. Upper ends of the core member 24 and the headrest stay 23 are embedded in the pad 25. When the headrest 21 is used, a backward load acting on the occupant's head is received by the hard core member 24, and the occupant's head is stably held.

  As shown in FIGS. 4 and 5, the core member 24 is formed of a synthetic resin material in a hollow shape by blow molding. An accommodation groove 26 for accommodating the upper end portion of the headrest stay 23 is formed on the rear surface of the core member 24 so as to open rearward. The housing groove 26 includes a support portion 26a for rotatably supporting the erection portion 23a of the headrest stay 23, and a pair of leg housing portions 26b for housing the upper ends of both leg portions 23b of the headrest stay 23. Become. Accordingly, the core member 24 and the pad 25 can be tilted relative to the headrest stay 23 around the installation portion 23a. A pair of upper and lower locking ridges 27 for preventing the core member 24 from falling off the headrest stay 23 are formed at the opening edge of the support portion 26a of the receiving groove 26.

  As shown in FIG. 4, a space portion 30 corresponding to the leg accommodating portion 26 b of the core member 24 is formed at the lower end portion of the pad 25, and a slit 40 is formed at the lower portion of the skin 22. 30 and the slit 40 allow the pad 25 to tilt with respect to the headrest stay 23.

  As shown in FIGS. 1, 4 and 5, both leg accommodating portions 26b of the accommodating groove 26 in the core member 24 are formed to have a predetermined depth with a substantially triangular side cross-sectional shape. For this reason, even if the headrest stay 23 rotates relative to the core member 24 around the installation portion 23a due to the tilting of the core member 24, the both leg portions 23b of the headrest stay 23 are accommodated in the accommodation groove 26. Maintain the state. A plurality of substantially hemispherical holding projections as holding means for holding the both leg portions 23b of the headrest stay 23 detachably at a predetermined plurality of tilting positions on the inner surfaces of both sides of each leg receiving portion 26b of the receiving groove 26 28 is formed.

  As shown in FIGS. 2 and 4, a closing sheet 29 is provided at the rear opening of the accommodation groove 26 so that the foamed resin constituting the pad 25 does not enter the accommodation groove 26. Accordingly, a space is formed in the accommodation groove 26. A space 30 is formed at the lower end of the pad 25 so as to communicate with the lower end opening of the receiving groove 26, and the leg 23 b of the headrest stay 23 passes through the space 30. The space portion 30 is formed by embedding a cylindrical body 39 in the lower end portion of the pad 25. A slit (not shown) is formed in the lower part of the skin 22 so as to correspond to the space part 30. Therefore, the leg portion 23b is allowed to tilt with respect to the core member 24 by the space portion 30 and the slit.

  Next, a blow molding apparatus for molding the core member 24 having the above-described configuration will be described. As shown in FIGS. 6 and 7, the blow molding apparatus 31 includes a pair of first and second molding dies 32 and 33 that can be opened and closed. Formed surfaces 32 a and 33 a corresponding to the outer shape of the core material 24 are formed on the inner surfaces of both molds 32 and 33. The first mold 32 is formed with a pair of insertion holes 34 for inserting both leg portions 23 b of the headrest stay 23 so as to extend substantially in parallel along the opening and closing directions of both molds 32, 33. A pair of side-surface triangular projections for forming leg housing portions 26b of the housing grooves 26 on the rear surface of the core member 24 are formed on the molding surface 32a of the first molding die 32 so as to correspond to the respective insertion holes 34. A portion 35 is formed. A plurality of hemispherical concave portions 36 for forming the holding projections 28 on the inner surface of the leg accommodating portion 26 b of the accommodating groove 26 are formed on the outer surface on both sides of each convex portion 35.

  As shown in FIGS. 7 to 9, a low ridge 37 is formed in a portion between the pair of insertion holes 34 on the molding surface 32 a of the first molding die 32. On the molding surface 32a of the first molding die 32, a pair of protrusions 38 are formed over a predetermined length at a portion adjacent to the inside of the both convex mold portions 35. When both the leg portions 23 b of the headrest stay 23 are inserted into the both insertion holes 34 of the first mold 32, the outer peripheral surface of the installation portion 23 a of the headrest stay 23 is brought into contact with the protrusion 37. A part of the erection part 23a is brought into contact with the protrusion 38 over almost a half circumference.

  As shown in FIG. 6, when the core member 24 is blow-molded along the molding surfaces 32 a and 33 a with the projections 37 and the projections 38 in the closed state of the molding dies 32 and 33, the installation of the headrest stay 23 is performed. A support portion 26a of the accommodation groove 26 is formed so as to surround the portion 23a, and a bent portion of the headrest stay 23 between the erection portion 23a and the leg portion 23b is exposed. As shown in FIGS. 6 and 8, a pair of locking ridges 27 are formed at the opening edge of the support portion 26 a of the receiving groove 26 in a portion corresponding to the ridge 37. Furthermore, both leg accommodating portions 26b of the accommodating groove 26 are formed by the convex portion 35 of the molding die 32 so as to communicate with both end portions of the supporting portion 26a of the accommodating groove 26. At this time, a plurality of hemispherical holding projections 28 are formed on the inner side surfaces of the both leg accommodating portions 26 b by the recesses 36 on the convex portion 35.

  Then, after the molding of the core material 24, the molding dies 32 and 33 are opened, so that the core material 24 and the headrest stay 23 are removed from between the molding surfaces 32 a and 33 a of the molding dies 32 and 33. Thereafter, both leg portions 23b of the headrest stay 23 are rotated by approximately 90 degrees from the protruding position at the time of molding indicated by a chain line in FIG. 3, so that the leg accommodating portion of the accommodation groove 26 is indicated by a broken line and a solid line in FIG. 26b.

  When forming the pad 25, the rear opening of the accommodation groove 26 is closed by the closing sheet 29 as shown in FIGS. 2 and 4. In this state, the core member 24 is accommodated in the skin 22, and the cylindrical body 39 is disposed at the position of the lower opening edge of the accommodation groove 26. In this state, a foaming raw material is injected into the skin 22 in a mold (not shown), and the foaming raw material expands and expands, whereby the pad 25 is formed, and the core member 24 and the headrest stay 23 are placed in the pad 25 in a predetermined manner. Set to position.

The headrest 21 having the core member 24 configured as described above has the effects listed below.
(1) In the core material 24 of this embodiment, the whole is integrally formed by blow molding, and an accommodation groove 26 for accommodating the upper end portion of the headrest stay 23 is provided on the rear surface of the core material 24. Yes. Therefore, even when a heavy load is applied to the headrest 21 with the core member 24 in the event of a vehicle collision, the both leg portions 23b of the headrest stay 23 and the inner surface of the receiving groove 26 are in contact with each other as shown in FIG. In contact therewith, the upper end portion of the headrest stay 23 is held in a state of being accommodated in the accommodation groove 26. For this reason, unlike the conventional configuration shown in FIGS. 11 to 13, the core member 24 can be prevented from rotating largely around the installation portion 23 a of the headrest stay 23. Even if a means for limiting the vehicle is not provided, it can have a function of holding the head of the passenger. Therefore, the number of parts is reduced, the configuration is simple, and the manufacture is easy.

  (2) The housing groove 26 includes a support portion 26a that rotatably supports the erection portion 23a of the headrest stay 23, and a pair of leg housing portions 26b that accommodate both the leg portions 23b of the headrest stay 23. And each leg accommodating part 26b is provided with the depth which maintains the leg part 23b in a accommodated state, when the leg part 23b is tilted by the predetermined angle based on the relative rotation of the installation part 23a with respect to the core material 24. Yes. Further, a plurality of holding projections 28 are provided on the inner surface of each leg receiving portion 26b of the receiving groove 26 so as to hold both the leg portions 23b so as to be detachable at a predetermined tilting position. Therefore, in the headrest 21 in which the core member 24 is housed, the core member 24 and the pad 25 can be tilted in the front-rear direction with respect to the headrest stay 23 to be held at a desired tilting position. The inclination angle of the pad 25 can be arbitrarily adjusted. In addition, when adjusting the inclination angle, a sense of moderation can be generated by the engagement between the leg portion 23b and the holding projection 28, and the adjustment can be appropriately performed.

  (3) As apparent from FIG. 6, the headrest stay 23 is not sandwiched between the parting lines of the molding device 31 for blow molding, so that the headrest stay 23 can be prevented from being damaged.

  (4) Since the bearing portion penetrating the wall portion of the core member 24 is not necessary, it is possible to prevent the elastic foamed resin from entering the core member 24. Therefore, it is possible to prevent the low density portion from being formed on the pad 25, to improve the manufacturing yield, and to obtain a high quality headrest.

Next, a second embodiment of the present invention will be described with a focus on differences from the first embodiment.
In the second embodiment, the closing sheet 29 in the first embodiment is not provided. Then, as shown in FIG. 10, the pad 25 is molded in a state where the core member 24 is adjusted and set to a predetermined tilt position with respect to the headrest stay 23 in advance. In addition, the space 30 in the first embodiment is not formed, and the entire lower portion of the pad 25 is fully configured. Therefore, in the case of this second embodiment, the elastic foamed resin is allowed to enter the housing groove 26 of the core member 24. Due to the intrusion of the elastic foamed resin, the both leg portions 23b of the headrest stay 23 are fixed at a predetermined tilt position by the elastic foamed resin in the both leg accommodating portions 26b of the accommodating groove 26.

  In the second embodiment, the same effects as those described in the first embodiment can be obtained except for the effects related to the adjustment of the tilt angles of the core member 24 and the pad 25. In the second embodiment, the angle formed between the core member 24 and the headrest stay 23 is determined when the headrest is manufactured. However, the angle is accurately set by the holding projection 28 on the inner surface of the receiving groove 26. The

  Therefore, when the headrest 21 is manufactured without changing the structure of the core member 24, the inclination angle of the pad 25 can be changed only by changing the molding method of the pad 25 made of an elastic foamed resin (not using the closing sheet 29). Instead of the changeable tiltable headrest, a fixed headrest whose tilt angle cannot be changed can be manufactured. Therefore, the core member 24 can be used as a common part for both types of headrests, and the manufacturing cost can be reduced.

  This embodiment is not limited to the first and second embodiments. For example, the present invention is embodied in a headrest of a type in which the outer periphery of the pad 25 is covered after the pad 25 is molded. This can be changed within a range not departing from the gist of the invention.

The partial fracture | rupture perspective view which shows the headrest of 1st Embodiment. The principal part cross-sectional view of the headrest of FIG. The principal part longitudinal cross-sectional view of the core material for headrests in the headrest of FIG. The principal part longitudinal cross-sectional view of a headrest. The principal part cross-sectional view of the core material for the headrest. Sectional drawing which shows the shaping | molding die in the case of shape | molding the core material for headrests of FIG. The perspective view which shows a part of shaping | molding die of FIG. FIG. 8 is a partial enlarged cross-sectional view taken along line 8-8 in FIG. 7. The partial expanded sectional view in the 9-9 line | wire of FIG. The principal part cross-sectional view which shows the headrest of 2nd Embodiment. The perspective view which shows the core material for the conventional headrest. The partial front view which shows the core material for the conventional headrest. The longitudinal cross-sectional view which shows the headrest provided with the core material for headrests of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 21 ... Headrest, 22 ... Epidermis, 23 ... Headrest stay, 23a ... Installation part, 23b ... Leg part, 24 ... Headrest core material, 25 ... Pad, 26 ... Accommodating groove, 26a ... Supporting part, 26b ... Leg accommodating part, 28: A holding projection constituting the holding means.

Claims (4)

A core material for a headrest, which is blow-molded and has an accommodation groove for accommodating the upper end portion of the headrest stay on the rear surface. The housing groove has a support portion that rotatably supports the erection portion of the headrest stay, and a pair of leg housing portions that accommodate both leg portions of the headrest stay, and each leg housing portion is provided with respect to the core material. 2. The headrest core material according to claim 1, further comprising a depth that maintains the leg portion in the accommodated state when the leg portion is tilted by a predetermined angle based on relative rotation of the portion. 3. The core material for a headrest according to claim 2, wherein a holding means for holding the leg portion at a predetermined tilt position is provided on an inner surface of the housing groove. The headrest core material according to any one of claims 1 to 3, a headrest stay in which an upper end portion is accommodated in an accommodation groove of the core material, and a headrest core material and an upper end portion of the headrest stay are embedded. A headrest characterized by comprising a pad and a skin covering the outer peripheral surface of the pad.

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