JP5366117B2 - Headrest and base material for headrest - Google Patents

Description

  The present invention relates to a headrest and a headrest base material that are mounted on an upper end of a seat back of a vehicle or the like.

  A headrest is attached to the upper end of a seat back of an automobile or the like for comfort. In the conventional fixed headrest, as shown in JP-A-9-276074, JP-A-8-66572 and the like, after the upper part of the metal stay is disposed in the bag-shaped skin, the foaming material is placed in the skin. In many cases, the resin was injected and integrally foamed. Only the metal stay was embedded in the foam inside the skin. In recent years, however, some headrests have been proposed that are intended not only for comfort but also for protecting the passenger's head in the event of a vehicle collision (for example, Patent Documents 1 and 2).

JP 2005-178196 A JP 2006-6823 A

  In the disclosed inventions of Patent Documents 1 and 2 and the like, the core material e is attached to the upper end of the stay leg 20 and the front of the connecting portion 21 as shown in FIG. These are fixed and used as headrests embedded in the foam g. At the time of rear-end collision, the force acting on the head HD is delayed compared to the force acting on the back (a in FIG. 14), so that the neck tilts backward to become a whip but the core e is provided. To prevent whiplash. This is because, in comparison with the conventional headrest HR, in the headrest provided with the core material e, the reaction force to the head HD rises with a low displacement. As shown in FIG. 14 (b), when a headrest without a core material (conventional product) is used, the displacement of the neck tilting backward is β, whereas in the headrest with the core material, the displacement of tilting the neck backward is as short as α. Thus, after the head HD comes into contact with the contact start point G of the headrest, the reaction force is set up early so that the headrest can be aimed at reducing whiplash.

However, the headrest in which the core material e of Patent Documents 1 and 2 is attached to the stay 2 has the following problems. Compared with the headrest without the core material, the headrest with the core material has an effect on the whip, but as shown in FIG. The core material e is generally made of a hard resin molded product having a predetermined thickness, and it is difficult to effectively absorb the collision energy (hereinafter referred to as “EA”) to the core material itself attached to the stay. It was. The headrests of Patent Documents 1 and 2 aim to provide EA characteristics, but depend on the stay rigidity and the strength of the core material itself, so the operating load is high and the value is not stable.
The EA material always functions between an object and a rigid body having a large mass and a large area. However, in the headrest of the stay with the core material, the portion corresponding to the rigid wall is the stay 2, more specifically, the upper portion of the stay, and the area thereof is very small and curved. It is only a very small area of a stay made of a thin cylinder or the like, and it becomes a curved surface, that is, a “micro curved surface”. Therefore, when the conventional core material is only a hard foam (A in FIG. 15), the EA material of the foam breaks and does not function.
The displacement-load characteristic (hereinafter referred to as “FS characteristic”) is ideally a rectangular wave like the target characteristic shown in FIG. On the other hand, the foam is easy to be broken because the stay bites in a wedge shape after rising to the right at the initial stage as shown in FIG. The foam refers to a block body using a foamed member made of urethane, bead foam or the like and having a fine cell structure inside. Even if another EA material, for example, a structure block C provided with a rib, is employed, the characteristics are remarkably changed depending on the location as shown in FIGS. The structure block is a three-dimensional structure made of resin, metal, or the like, and refers to a member in which ribs (vertical walls) are arranged in the compression direction and EA is performed by buckling. When the stay is placed on a rib (C-1 in FIG. 15) and the stay is placed on a place that is separated from the rib (C-2 in FIG. 15), the thin curved surface of a thin cylinder such as a stay is used. Then, the FS characteristics are greatly different as shown in FIG. When nonlinear materials such as rubber and gel are used for the EA material (B in Fig. 15 (a)), the load rises badly, and the load rises when the shoulder rises to the right, so a high load of about 60% to 70%. There was a problem that reached.

  The present invention solves the above-mentioned problems. In the stay to which the core material is attached, the collision energy can be absorbed stably and efficiently even in the stay with the minute curved surface. An object is to provide an enhanced headrest and a headrest base material.

In order to achieve the above object, the gist of the invention described in claim 1 is a headrest base material embedded in a foam by integral foam molding of the headrest, wherein the upper end portions of the pair of leg portions are connecting portions. The combined stay and the rear half member and the front half member that is plate-shaped and recessed on the inner surface side are provided as a pair, and a hollow portion is formed by joining both half members, and the stay of the stay is formed in the hollow portion. A pair of upright plate portions are opposed to the inner surface of the front plate portion disposed in the vertical direction in the longitudinal sectional view of the front half-split member in the hollow portion, and the core member disposed on the upper portion and disposed in the hollow portion. An energy absorbing structure disposed so that the top surface of the top plate portion is in contact with or close to the connection portion, and the front plate portion. And a column having a height higher than that of the top surface, and the connection with external force Is pressed, and the compressive force to shrink between the connecting portion and the front plate portion is received by the plate surface of the top plate portion, and the distance between the connecting portion, the top plate portion and the front plate portion is reduced, In the process of causing bending deformation in the upright plate portion and further bringing the support column into contact with or close to the connecting portion from above to narrow the space between the connecting portion and the front plate portion, the connecting portion becomes the top plate It is in the base material for headrests which guides so that it may not drop from a part .
A base material for a headrest according to a second aspect of the present invention is the base material for a headrest according to the first aspect, wherein the plate-like standing plate portions extending along the connecting portion are opposed to each other, and are arranged in the vertical direction of the top plate portion. In the height range, a height point of the connecting portion disposed horizontally is set. A base material for a headrest according to a third aspect of the present invention is the base material for headrest according to the first or second aspect, wherein the rear half member and the front half member are integrally formed through a thin-walled hinge portion, and the rear half member is further formed. A protruding portion is provided on the inner surface of the halves, and the connecting portion is locked between the protruding portion and the top plate portion by joining the two halves. A base material for a headrest according to a fourth aspect of the present invention is the base material for a headrest according to the first to third aspects, wherein a central region between the intermediate portion of the connecting portion and the front plate portion is opened, and the support is provided on the inner surface of the front plate portion of the central region. The energy absorbing structures are disposed on both sides of the central region. A base material for a headrest according to a fifth aspect of the present invention is the base material for a headrest according to the first to fourth aspects, wherein the pair of the standing plate portion and the top plate portion is a substantially U-shaped resin energy absorption structure in a side view, and the connection The portion is in contact with or close to the top surface of the intermediate region at an approximately equal distance from the pair of standing plate portions at a position substantially in the vertical direction of the top surface of the top plate portion.
The gist of the invention described in claim 6 is a bag-shaped skin, a stay in which upper ends of a pair of leg portions are coupled by a connecting portion, a core member attached to an upper portion of the stay, an upper portion of the stay, and the stay Injecting foaming raw material into the skin where the core material is disposed, and foaming cured by integrating the skin, the stay, and the core material, and a headrest comprising:
The core member is provided in a pair of a rear half member and a front half member whose inner surface side is recessed in a plate shape, and a hollow portion is formed by joining both half members, and the upper portion of the stay is formed in the hollow portion. And the core is attached to the upper part, and further, in the hollow part, on the inner surface of the front plate part arranged in the vertical direction in the longitudinal sectional view of the front half member, on the connecting part An energy absorbing structure in which a pair of plate-like standing plate portions extending along the opposite sides are opposed to each other and both end portions thereof are connected by the top plate portion, and the top surface of the top plate portion is brought into contact with the connecting portion. Set the height point of the connecting portion that is arranged in contact with or in close proximity and is horizontally disposed in the vertical range of the top plate portion , and further on the inner surface of the front plate portion from the top surface A high column is erected, and the connecting portion is pushed by an external force, and the top plate receives a compressive force to shrink the connecting portion and the front plate portion. In addition to being received by the plate surface, the distance between the connecting portion, the top plate portion and the front plate portion is reduced to cause bending deformation in the standing plate portion, and the support column is brought into contact with or close to the connecting portion from above Then, in the process of narrowing the space between the connecting part and the front plate part, the connecting part guides the connecting part so as not to fall off from the top plate part .

As in the first and sixth aspects of the invention, a pair of upright plate portions are erected oppositely to the inner surface of the front plate portion in the hollow portion formed by joining the two halves, and the tip portions thereof are When the energy absorbing structure connected by the top plate is arranged, there is no foam that fills the skin by integral foam molding in the area where the energy absorbing structure changes in shape such as bending deformation and buckling deformation. The energy absorbing structure can fully exhibit its energy absorbing function without being restricted by the foam.
Between the connecting part and the front plate, the front facing the pair of vertical plate portions on the inner surface of the plate portion is erected top plate which is connected to its both ends portions provided, the top surface of the top plate portion When arranged so as to contact or be close to the connecting part, even with a micro-curved stay, the distance between the connecting part and the front plate part approaches the top plate part through the top plate part due to a vehicle collision. Bending deformation occurs in the part. A load that rises to the right is generated in accordance with the angular displacement caused by the bending deformation of the standing plate portion, and thereafter, the load transmission angle increases while maintaining the load, and a desired FS characteristic value close to a rectangular wave is obtained. The collision energy can be absorbed efficiently. Increase safety in the event of a vehicle collision.
The stay includes a stay, a core material, and an energy absorbing structure, and the connecting portion is pushed by an external force, and the compressive force to shrink between the connecting portion and the front plate portion is received by the plate surface of the top plate portion, and the connecting portion, When the distance between the top plate and the front plate is shortened and bending deformation occurs in the standing plate, it is compressed into the connecting part related to the stay (a circular with a small cross section) corresponding to the minute curved surface that has been regarded as difficult. Even if a force is applied, the energy is first received by the top surface of the top plate portion, and further received as a bending load due to bending deformation of the pair of upright plate portions, thereby absorbing stable and efficient energy. . A pair of upright plate portions are erected on the inner surface of the front plate portion and are arranged so that the top surface of the top plate portion, which is connected to both ends of the front plate portions, is in contact with or close to the connection portion. Is pressed, and the compression force to shrink the space between the connecting portion and the front plate portion is received by the plate surface of the top plate portion, and the distance between the connecting portion, the top plate portion and the front plate portion is reduced to When bending deformation occurs, energy is absorbed mainly by the bending load of the standing plate portion, and an EA characteristic having a desired rectangular wave can be obtained in the elastic region, so that collision energy can be absorbed efficiently. Even for stays with minute curved surfaces, the compressive force from the stay is received once on the surface of the top plate part, and this is absorbed by the bending deformation of the vertical plate part, so stable and effective energy absorption is achieved. Yes.
In addition, if the compressive force is received by the plate surface of the top plate portion and the distance between the connecting portion, the top plate portion and the front plate portion is reduced to cause bending deformation in the vertical plate portion, the bending load of the vertical plate portion is exclusively used. Can be absorbed in its elastic region, and in that range, the energy absorbing structure is not destroyed or damaged, and can be reused if it is a light collision. Since the energy absorbing structure is mainly composed of bending load, it can withstand reuse unless it breaks. When the connecting part is pushed by an external force to cause bending deformation in the standing plate part, in an actual rear-end collision, in the case of a light collision, the collision load is absorbed by the bending load of the standing plate part and Protect. Thereafter, the standing plate portion slowly recovers. Heavy collisions may eventually lead to buckling failure of the standing plate part, but in the first half of the collision, the bending plate is elastically restored and the bending load due to buckling deformation is high and efficient. To absorb the collision energy.
Furthermore, a pair of upright plate portions are erected on the inner surface of the front plate portion, and the top plate portions are connected to the tip portions thereof, and the top surface of the top plate portion is disposed so as to contact or be close to the connection portion. Then, since the energy absorption structure is disposed between the front plate portion and the connecting portion in the hollow portion, it is utilized as the displacement of the FS characteristic up to the height of the energy absorption structure having the energy absorption space. Can be formed, and collision energy can be effectively absorbed.
More specifically, a top plate portion is provided in which a pair of upright plate portions are opposed to each other on the inner surface of the front plate portion arranged in the vertical direction in the longitudinal section of the front half-split member, and both end portions thereof are connected. The energy absorption structure makes it easy to adjust the output of the FS characteristics depending on the thickness of the standing plate and top plate, and the extension length. Can be manufactured.
In addition, when a support column is erected on the inner surface of the front plate part and the upper part of the support column is in contact with or close to the connection part disposed in contact with or close to the top surface, the collision force varies. Even if working from any angle, the struts guide and correct the trajectory, so that the energy absorbing structure can be used effectively and the collision energy can be absorbed stably and efficiently. In the process of narrowing the space between the connecting portion and the front plate portion by bringing a support column into contact with or close to the connecting portion from the upper side, the support portion is regulated so that the connecting portion does not fall off from the top plate portion. In response, the connecting portion to which the compressive force is applied moves so as to be orthogonal to the receiving surface of the top plate portion and the receiving surface of the front plate portion of the core member while sliding the column main body of the column. By inducing a compressive force in a specific direction with the support, the energy absorbing structure can function effectively even in a vehicle collision from various directions, and the collision energy can be stably absorbed. Dramatically improve safety in the event of a vehicle collision.
As in the invention of claim 3 , when the rear half member and the front half member are integrally formed through the thin-walled hinge portion, the joining of both the half members with the hinge portion as a fulcrum becomes simple. The Ru can be cost reduction. After portions projecting portion provided on the inner face of the half member, the joining of the two half-split members, when engaging the connecting portion between the projecting portion and the top plate portion, the attachment of the core to stay by the locking is Since it is stable, the integral skin molding proceeds smoothly.
As in the invention of claim 5, when the resin-made energy absorbing structure is used, the upright plate portion is bent and deformed and buckled to absorb the collision energy as a reaction force. Restores slowly and does not damage the head. In addition, the energy absorbing structure and the resin core can be integrally formed, and the cost can be reduced.

  The headrest and the headrest base material of the present invention are in a stay to which a core material is attached, and even in the minute curved stay, the collision energy is efficiently absorbed at the time of a vehicle collision, and is surely and stable. Absorbs the occupant's head and dramatically improves the protection of the occupant's head.

Hereinafter, embodiments of the headrest and the headrest substrate according to the present invention will be described in detail.
1 to 11 show an embodiment of the headrest and the headrest base material according to the present invention. FIG. 1 is an exploded perspective view of the headrest base material, and FIG. 2 is the headrest base material of FIG. FIG. 3 is a side sectional view of a headrest in which a headrest base material is incorporated, and FIG. 4 is an explanatory cross section for explaining a change caused by a vehicle collision in the headrest base material of the headrest according to FIG. FIG. 5, FIG. 5 is an explanatory sectional view of the headrest showing the relationship between the compressor stroke and the energy absorbing structure at the time of rear-end collision, FIG. 6 is an exploded perspective view of another embodiment of the headrest substrate instead of FIG. 1, and FIG. 8 is a perspective view of a headrest base material according to another embodiment different from FIG. 1 and FIG. 6, FIG. 8 is an explanatory cross-sectional view showing how the headrest base material of FIG. 7 is assembled, and FIG. In between The absorbent structure in the description section view of the present invention product interposed a FS characteristic comparison diagram of the reaction force characteristic schematic view, FIG. 10 from the present invention and the conventional products (i). FIG. 11 is a schematic side view of another embodiment of the energy absorbing structure different from the energy absorbing structure of FIG. 1, and FIG. 12 is an explanatory view showing a change in FS characteristics with respect to the compression direction. In FIG. 7, the stay is not shown, and in FIG. 5, the support and the protrusion are not shown.

(1) Base material for headrest The base material 1 for headrest is an integral foam molding of the headrest, and is embedded in the foam 8 leaving the lower part of the stay, and the stay 2, the core material 3, the support column 4, and the energy absorbing material. And an energy absorbing structure 5 having a space 6 (FIG. 3). The stay 2 is a known product, and is a stay 2 in which a pair of leg portions 20 are arranged in parallel, and upper end portions 20a of both leg portions 20 are connected by a connecting portion 21. In the present embodiment, as shown in FIG. 1, a cylinder or a pipe is bent into a U shape to form a leg portion 20 and a connecting portion 21 having the same thickness. Reference numeral 24 denotes a stay base end portion attached to the seat back upper end 921 (FIG. 5). A core material 3 is attached to the upper portion 2a of the stay.

  The core member 3 is a resin molded product in which a rear half member 3b and a front half member 3a having a plate shape and recessed on the inner surface side are provided in pairs. Here, it is assumed that the front half member 3a and the rear half member 3b are integrally formed through a thin hinge portion HN. The front half member 3a and the rear half member 3b are both curved plates to form a bowl-shaped container as shown in FIG.

  The front half member 3a is a plate-shaped molded product that can secure an energy absorbing space 6 (described later) between the front plate portion 30 and the connecting portion 21, and the front plate portion 30, the side plate portion 31, and the bottom plate portion 32. And an upper plate portion 33. A curved plate-like front plate portion 30 having an arcuate longitudinal section projects toward the front surface of the headrest. The horizontal width of the front plate portion 30 is made slightly larger than the distance between the pair of leg portions 20. A flat bottom plate portion 32 extends from the lower edge of the front plate portion 30 to the leg portion 20 side (rear side). The bottom edge of the bottom plate portion 32 is provided with a fitting recess 32b into which the pair of stay leg portions 20 are fitted by cutting out both sides. A locking claw 32c is provided at the introduction port portion that forms the fitting recess 32b to prevent the leg 20 inserted in the fitting recess from coming out. The front plate portion 30 includes a bottom plate portion 32, an upper plate portion 33 bent from the upper edge of the front plate portion 30 toward the leg portion side, and both side plate portions 31 bent from both side edges of the front plate portion 30 toward the leg portion side. The inner half 30b is surrounded by a rugged and rigid front half member 3a (FIG. 1). In the present invention, deformation and EA are not performed in principle on the front half member 3a serving as the pressure receiving surface so that there is no difference in performance depending on the striking position and angle at the time of a vehicle collision such as rear-end collision. The impact force of the collision is transmitted to the energy absorbing structure 5 having the energy absorbing space 6 provided on the inner surface side (rear surface side) of the front half member 3a.

A support column 4 stands on the inner surface of the front plate portion 30. The support column 4 is erected on the front plate portion 30 substantially at the center of both side plate portions 31 and near the hinge portion HN. The height of the support column 4 is higher than the top surface 52a of the top plate portion 52 (described later), and the upper portion 41 of the support column abuts from above at a substantially middle point of the connecting portion 21 disposed on the top surface. Or close. At the time of a vehicle collision, the space between the connecting portion 21 and the front plate portion 30 is reduced by crushing the energy absorbing structure 5 as shown in FIGS. 4 (A) to 4 (C). The part 21 is guided so as not to fall off the top plate part 52 of the energy absorbing structure 5.
In the present headrest and the headrest base material 1 attached to the seat back upper end 921 as shown in FIG. 5, the upper direction in the present invention refers to the upward direction from the bottom plate portion 32 to the upper plate portion 33 (in FIG. (Upward), front means the vehicle front direction from the headrest (left side in FIG. 3), and horizontal means the plate surface direction of the bottom plate portion 32 (perpendicular direction in FIG. 3). In order to obtain the rigid front half member 3a, reinforcing ribs are provided everywhere on the inner surface side of the core member 3, but illustration thereof is omitted.

The rear half member 3b is a plate-shaped molded product that is attached to the stay upper portion 2a in a state in which the rear wall portion 35 is retracted rearward and becomes the bottom, and the rear wall portion 35, the side wall portion 36, and the bottom wall portion. 37 and an upper wall portion 38. The rear half-split member 3b has a shallow bowl shape with a substantially U-shaped longitudinal section, and is bent from the lower edge of the rear wall portion 35 to the front half-split member 3a side (front side) to form a flat bottom wall portion. 37 extends. The front edge of the bottom wall portion 37 is provided with a fitting recess 37b by cutting out both sides thereof, and the fitting recess is fitted from the rear side to the back surface of the stay leg portion 20 fitted into the fitting recess 32b. In close contact.
The upper wall portion 38 is connected to the front half member 3a via the hinge portion HN. The upper surface opening of the bowl-shaped rear half member 3b has the same shape as the upper surface opening of the front half member 3a, and concave and convex portions (not shown) that are fitted to each other are provided on both opening edges. The rear half member 3b is recessed at a portion corresponding to the locking claw 32c, but is simply illustrated without the recess here. Both halved members 3a and 3b can be joined so as to close each other's opening with the hinge portion HN as a fulcrum. The upper portion 2a of the stay is covered by the joining of the two halves 3a and 3b, and the stay leg portion 20 is locked to the fitting recess 32b and the fitting recess 37b. The upper portion 2a of the stay is disposed in a hollow portion 3d formed in the core material 3 by joining both the half-divided materials 3a and 3b, and the core material 3 is attached to the upper portion of the stay. By attaching the core material 3 to the stay 2, the hollow portion 3d of the core material 3 becomes a hollow portion in which intrusion of the foaming raw material is prevented during the foam molding process (FIG. 3).

  Here, “the hollow portion 3d in which the intrusion of the foaming raw material is prevented” does not have to be the airtight hollow portion 3d in which the foaming raw material does not enter the hollow portion 3d in the foam molding process. In 3d, it is sufficient if the space 6 for energy absorption provided between the connecting portion 21 and the front plate portion 30 of the front half member 3a can be secured. This is because even if the foaming raw material partially penetrates into the hollow portion 3d during foam molding, the function and effect of the present invention can be exhibited if the energy absorbing space 6 can be secured.

  A protrusion 39 is provided on the inner surface of the rear wall portion 35 associated with the rear half member 3b. A protruding portion 39 protrudes from the inner surface at the substantially center of the rear wall portion 35. By joining the two halves 3a and 3b, the connecting portion 21 can be locked by the protruding portion 39 and the top plate portion 52 of the energy absorbing structure 5 having the energy absorbing space 6.

  In the energy absorbing structure 5, the plate-like standing plate portion 51 extending along the connecting portion 21 is opposed to the front plate portion inner surface 30b so that the tip portion of the compatible plate portion 51 is the top plate portion. These are plate-like processed members connected at 52. As shown in FIGS. 1 and 2, the pair of upright plate portions 51 and the top plate portion 52 form a resin or metal energy absorption structure 5 that is substantially U-shaped in a side view. The energy absorbing structure 5 here is a single piece of resin-molded processed product that is elastically deformable and has a separate structure from the front half member 3a. The energy absorption structure 5 forms an energy absorption space 6 and is attached to the front plate portion 30. The extending portion 53 extending from the base end of the standing plate portion 51 and the front plate portion 30 are fixed with screws 54. As shown in FIG. 3, on the inner surface 30 b of the front plate portion 30 arranged in the vertical direction in the vertical sectional view, the upper vertical plate portion 51 that tilts backward and lower, the lower vertical plate portion 51 that tilts upward and backward, and the tip of the compatible plate portion 51 The energy absorbing structure 5 including the top plate portion 52 connecting the portions is fixed. One energy absorbing structure 5 is provided on each of both sides of the front plate 30 with the support column 4 in the middle. 3 is a longitudinal cross-sectional view of the headrest base material 1 with the headrest mounted on the seat back upper end 921, and the top surface 52 a (vehicle rear side) of the top plate portion 52 is in contact with or close to the connecting portion 21. Thus, the height point of the connecting portion that is horizontally disposed in the vertical range of the top plate portion 52 is set. At the stage where the two halves 3a and 3b are joined, the top plate portion 52 faces the projection 39 and is close to the projection 39. The joining portion 21 can be sandwiched and locked by the top plate portion 52 and the protruding portion 39 by joining the half-split members 3a and 3b.

The energy absorbing structure 5 is substantially U-shaped when viewed from the side. Specifically, the energy absorbing structure 5 as shown in FIG. 3 in which the compatible plate portion 51 extends in a side view and slightly in a C shape toward the base end. The top plate portion 52 has a concave top surface 52a that abuts (or is close to) the connecting portion 21 as shown. When the core 3 is attached to the stay 2, when the upper portion 2a of the stay is inserted into the half-open core 3 housed in the bag-like skin 7, the connecting portion 21 at the tip of the stay is connected to the support 4 as shown in FIG. It hits. When the headrest is mounted on the seat back 92 of FIG. 3, the connecting portion 21 is horizontal at a height point of about ½ of the front plate portion 30. And can be placed on the top plate portion 52 of the energy absorbing structure 5. From this state, the stay leg portion 20 is fitted into the fitting recess 32b, the rear half member 3b is tilted and joined to the front half member 3a with the hinge portion HN as a fulcrum, and the hollow portion 3d is formed by the core member 3. The connecting portion 21 is locked by the top plate portion 52 and the protruding portion 39. The core material 3 is stably held on the stay 2 by the three-point stop of this lock and the lock by fitting into the fitting recess 32b and the fitting recess 37b of both legs of the stay.
Thus, when the distance L between the connecting portion 21 and the front plate portion 30 decreases due to a vehicle collision, the vertical plate portion 51 is bent and deformed via the top plate portion 52 (FIGS. 3 to 3). 5).

FIGS. 6-8 is a different aspect product from the base material 1 for headrests of FIGS. FIG. 6 shows the headrest substrate 1 in which the front half member 3a and the rear half member 3b are separated from each other by eliminating the hinge portion HN. 7 and 8 show a headrest base material in which the energy absorbing structure 5, the rear half member 3b, the front half member 3a, and the hinge portion HN are integrally formed. In FIG. 7, the standing plate portion 51, the top plate portion 52, the standing plate portion 51, and the engagement protrusion 55 are extended from the hinge portion HN through the flexible tongue piece portion 56. The tongue piece 56 is provided with a T-shaped hole 561 as shown. A T-shaped boss 34b corresponding to the shape of the hole 561 rises on the front plate portion 30 side where the tongue portion 56 is tilted to the front half member 3a side with the hinge portion HN as a fulcrum. The deep groove 34a ₁ is provided in the rib 34a corresponding to the engaging projection 55. Deep groove 34a ₁ is formed on the rib 34a that is integrally molded into the front-half member 3a. Tongue 56 from the state of FIG. 7, to pivot the energy absorbing structure 5, the vertical plate portion 51, top panel 52, when placed on the front plate portion 30 of the standing portion 51, the engaging projections to the deep groove 34a ₁ 55 is locked, and the T-shaped hole 561 is fitted and locked to the T-shaped boss 34b, and the energy absorbing structure 5 is attached to the inner surface 30b of the front plate 30 as shown in FIG. As in the case where the energy absorbing structure 5 is screwed and fixed to the front plate portion 30 with the screws 54 in FIG. 1, the pair of upright plate portions 51 face each other and both end portions thereof are top plate portions 52. The connected energy absorbing structure 5 is attached to the front plate portion 30.
1 to 5 show the support column 4 as a separate body, but the support column 4 can be integrally formed with the front half member 3a as shown in FIG. In FIG. 7, two support columns 4 stand on the front plate portion 30. In FIG. 8, the width of the projecting portion 39 in the direction perpendicular to the paper surface is reduced, the columns 4 are provided on both sides of the projecting portion, and the energy absorbing structures 5 are provided on the outer sides of the both columns 4.

The headrest base 1 is bent and deformed in the upright plate portion 51 at least in the initial stage of the collision by approaching the distance L (FIG. 5) between the connecting portion 21 and the front plate portion 30 in a vehicle collision such as a rear-end collision. The resulting energy absorbing structure 5 absorbs the collision energy with its bending deformation. For example, in the energy absorbing structure 5 shown in FIG. 9 (b), when an external force in the direction of the arrow is applied to the connecting portion 21 by a collision or the like, the connecting portion 21 is pushed by the external force, and the connecting portion 21 and the front plate portion A compressive force that attempts to shrink the space between 30 works. The compressive force from the connecting portion 21 is received by the plate surface of the top plate portion 52, and the distance L between the connecting portion 21, the top plate portion 52 and the front plate portion 30 is reduced (FIG. 5), and FIG. In this way, bending deformation occurs as the standing plate portion 51 bulges outward.
The energy absorbing structure 5 according to the headrest base material 1 does not use the buckling load seen in the structure block of FIG. 13 but instead of the upright plate portion 51 having a curvature as shown in FIG. Use bending load. The bending load of the upright plate portion 51 is utilized for energy absorption. Here, in the space 6 formed by the energy absorbing structure 5, no structure is disposed directly below the direction of travel of the compressor (here, the connecting portion 21) other than the structure. A hollow portion 3d is secured by joining both the half-divided members 3a and 3b, and a space 50 is formed in the U-shaped frame body of the energy absorbing structure 5 in a side view. This is to avoid generation of a load with a bottom and to obtain high stroke efficiency. As shown in FIG. 9A, the bending load of the energy absorbing structure 5 generates a load that rises to the right along with the angular displacement caused by the bending of the upright plate portion 51. However, the compression direction can be guided to a predetermined linear track. For example, a rectangular wave is formed by increasing the transmission angle of the bending load with respect to the compressive force in the input direction.

In order to effectively perform EA when the rear-end collision occurs, it is necessary to deform the energy absorbing structure 5 while maintaining the target load. In the rear-end collision, it is required that the EA characteristic with a long stroke of about 60 mm is stably operated at a low load of, for example, about 600 [N], which is the target load. It can be secured. Figure 11 (a) to (c) show an example of the energy absorbing structure 5, appropriately selected to the thickness t ₂ of the sheet thickness t ₁ further top panel 52 of the standing portion 51 _(see FIG. 11) Thus, a desired rectangular wave is obtained. In the present invention, since the reaction force characteristic is obtained by the sum of the loads received by the two plate-like standing plate portions 51 facing each other, the compression direction is substantially the same as the distance from the pair of standing plate portions 51 on the top surface 52a of the top plate portion 52. It is preferable to set it to be a plane (perpendicular to the top surface 52a) at an equal distance in the middle. As shown in FIG. 3, when the headrest is attached to the seat back 92, the connecting portion 21 is located at a substantially intermediate position in the vertical direction of the top surface 52 a of the top plate portion 52, and is in an intermediate region that is approximately equidistant from the pair of standing plate portions 51. It is preferable to be arranged in contact with or close to the top surface and parallel to the compatible plate portion 51. It is preferable that the front plate portion 30, the top plate portion 52, and the connecting portion 21 are arranged so as to be substantially parallel.

Thus, even if a compressive force is applied to the connecting portion 21 related to the stay 2 (circular shape with a small cross section) corresponding to the minute curved surface that has been regarded as difficult, the energy is first received by the top surface 52a of the top plate portion 52. Further, through this, it is accepted as a bending load due to bending deformation of the pair of standing plate portions 51, and stable and efficient energy absorption is performed. In the headrest substrate 1, the reaction force characteristic of the energy absorbing structure 5 when a compressive force is applied is as shown in FIG. 9 (a), and the ideal rectangular wave (target value) shown in FIG. ) Actually, as shown in FIG. 10, unlike the conventional product in which the core material 3 is simply attached to the stay 2, the present invention in which the energy absorbing structure 5 is arranged on the inner surface side of the front plate portion 30 is ideal. It has been confirmed that an FS characteristic value close to a rectangular wave can be obtained. 1 to 11, in order to make the drawings easy to understand, the plate thickness of the core material 3 and the plate thickness of the upright plate portion 51 are shown to be substantially the same, but the actual plate thickness t ₁ of the upright plate portion 51 is Since the bending deformation is generated by the compressive force, it is smaller than the illustrated plate thickness.

By the way, in FIG. 12 (a), the compression direction passes through the shaft core of the connecting portion 21 and is in the a direction so as to be orthogonal to the top surface 52a of the top plate portion 52 and further to the receiving surface of the front plate portion 30 of the core material 3. If there is, the desired rectangular wave shown in FIG. If the compression direction can be fixed to a specific linear trajectory, specifically the arrow direction in FIG. 9B, the rectangular wave shown in FIG. 9 can be obtained as the displacement in the input direction of the compression force increases. However, it is difficult to obtain the rectangular wave unless the compression direction can be fixed. When the compression direction passes through the axis of the connecting portion 21 and crosses the upright plate portion 51 and becomes the direction b in FIG. 12A, a satisfactory rectangular wave cannot be obtained as shown in FIG.
For this reason, the headrest base material 1 of the present embodiment is provided with the support columns 4 so as to be able to absorb energy satisfactorily even when a compressive force in the b direction is applied. The energy absorption structures 5 are respectively disposed on both sides of the central region TR with a central region TR between the intermediate portion 211 of the connecting portion 21 and the front plate portion 30 (FIG. 1). The energy absorption structure 5 is not disposed in the central region TR, and the energy absorption structures 5 are disposed on both sides of the central region. Thus, with the headrest mounted on the seat back 92, the support column 4 is provided that stands on the inner surface 30b of the front plate portion of the central region TR and contacts or approaches the connecting portion 21 from above.

By providing the column 4, even if a compressive force in the direction b shown in FIG. 12 is applied, the column 4 is regulated and corrected in the direction indicated by the black arrow in FIG. 4 (c), that is, the direction a in FIG. Is done. The connecting portion 21 to which the compressive force is applied moves so as to be orthogonal to the receiving surface of the top plate portion 52 and the receiving surface of the front plate portion 30 of the core member 3 while sliding the column main body 40 of the support column 4. Even if the compressive force in the direction b in FIG. 12 is applied, the trajectory is corrected in the direction a in FIG. 12, and a desired rectangular wave is obtained.
In an actual rear-end collision, in the case of a light collision, as shown in FIG. 4B, the collision energy is absorbed by the bending load of the upright plate portion 51 to protect the occupant head HD. Then, the standing board part 51 restore | restores slowly. In the case of heavy collision, the standing plate portion 51 may eventually be buckled and broken (FIG. 4C), but in the first half of the collision, the standing plate portion 51 is elastically restored by bending deformation and buckling deformation. Efficiently absorbs a lot of collision energy as a bending load due to. The headrest core material 3 is incorporated in the headrest as shown in FIG. 3 and effectively absorbs the relative kinetic energy acting on the occupant head HD at the time of rear-end collision.

Next, the structure in which the headrest base material effectively absorbs the relative kinetic energy acting on the occupant's head HD during the rear-end collision will be described in more detail with reference to FIG.
As described above, the connecting portion 21 is sandwiched and locked between the top plate portion 52 and the protruding portion 39, and the fitting recess 32b is fitted to the stay leg portion 20 so that the core member 3 and the stay 2 are connected. It is integrated. An energy absorbing structure 5 having an energy absorbing space 6 is disposed between the front plate portion 30 and the connecting portion 21. The connecting portion 21 abuts on the top plate portion 52 and is horizontally disposed at an intermediate height point of the top plate portion.
Since the energy absorbing structure 5 is easily elastically deformed when the vehicle is collided, it changes from the state shown in FIG. 4 (a) to the state shown in FIGS. 4 (b) and 4 (c). While sliding and displacing 20, the core member 3 can be rotationally displaced as indicated by a chain line in FIG. 5 with this sliding displacement point as a fulcrum. In the figure, the arrows indicate the traveling trajectory of the compressor (here, a 168 mmφ sphere simulating the occupant head HD). The compressor having the relative kinetic energy at the time of the collision advances from the initial contact position X to the full stroke position Z through the core material interference position Y. From the point where the core material interference position Y is reached, the standing plate portion 51 of the energy absorbing structure 5 absorbs energy by bending deformation (b in FIG. 4) and further by bending buckling (c in FIG. 4). In parallel with this, the core member 3 rotates with the fitting portion as a fulcrum while the fitting portion slides on the leg 20, and the core member 3 tilts backward like a chain line.
Thus, due to this backward tilting of the core material 3, the distance from the core material interference position Y to the full stroke position Z reaching the core material 3 tilted backward from the chain line becomes the compressor stroke AL. In the headrest base 1, a longer compressor stroke AL is ensured than the distance L of the energy absorbing space 6. By securing the long compressor stroke AL, the relative kinetic energy acting on the occupant head HD at the time of rear-end collision is efficiently absorbed.

  The energy absorbing structure 5 is satisfied with resin or metal, but resin is more preferable. When the standing plate 51 is bent and bent and buckled, the collision energy is absorbed as a reaction force, but then the resin product is restored more slowly than the metal product, and the head HD is not damaged. is there. Moreover, if it is made of resin, the energy absorbing structure 5 and the resin core material 3 can be integrally formed, and the cost can be reduced.

(2) Headrest This headrest is made by injecting a foaming raw material into the bag-shaped skin 7, the stay 2, the core material 3, the upper portion 2a of the stay, and the inner skin 70 where the core material 3 is disposed. A foam 8 that is integrated with the stay and the core and foamed and hardened, and the headrest base material 1 other than the lower portion of the stay is disposed in the bag-like skin 70, A foaming raw material is injected into the skin and integrally molded.
The core member 3 is provided in a pair of a rear half member 3b and a front half member 3a which is plate-shaped and recessed on the inner surface side, and a hollow portion 3d is formed by joining both the half members 3a and 3b. The upper part 2a of the stay is disposed in the part and attached to the upper part. And the hollow part 3d formed by joining both the half-divided materials 3a and 3b is prevented from intrusion of the foam raw material in the foam molding process. And it is set as the headrest by which the energy absorption structure 5 which has the space 6 for energy absorption is arrange | positioned between the connection part 21 and the front board part 30 of the front part split material 3a by this hollow part 3d.

  The bag-like skin 7 is formed in a pillow shape as shown in FIGS. 2 and 3, and the bottom portion 72 is provided with a foam raw material inlet (not shown) and a stay hole 72 b. Usually, the front portion 71 comes into contact with the occupant's head HD and conveys the comfort of the foam 8 rich in cushioning properties to the occupant. On the other hand, an energy absorbing structure 5 having an energy absorbing space 6 is disposed in the headrest to absorb collision energy. In the event of a vehicle collision (EA operation), a support column 4 is provided to guide the stay connecting portion 21 so as to pass a specific track in the energy absorbing space 6 so that the collision energy can be stably absorbed.

  Even in the headrest, in the energy absorbing space 6 included in the energy absorbing structure 5, in addition to the structure, a structure is not disposed immediately below the direction of travel of the compressor (here, the connecting portion 21). The headrest base material 1, stay 2, core material 3, support column 4, energy absorption structure 5, energy absorption space 6, central region TR and the like are the same as those described in (1) Headrest base material 1. I will omit the explanation. The same reference numerals indicate the same or corresponding parts.

(3) Effects The headrest and the headrest base material configured as described above absorb energy mainly by the bending load of the standing plate portion 51, and can obtain an EA characteristic having a desired rectangular wave in its elastic region. Energy can be absorbed efficiently. Even for the stay 2 having a minute curved surface, the compressive force from the stay 2 is once received by the surface of the top plate portion 52, and this is absorbed by the bending deformation of the upright plate portion 51, so that it is stable and effective. Energy absorption.
The hollow portion 3d is formed by joining both the half-divided members 3a and 3b, and the energy absorbing structure 5 having the energy absorbing space 6 is disposed therein, so that the upright plate portion 51 related to the structure holds the hollow portion 3d. Bending deformation and bending buckling can be fully utilized to absorb collision energy. If the foam 8 is filled in the skin during the foam molding process, the foam 8 that has entered the space 50 may obstruct the bending deformation of the upright plate portion 51, making it difficult to absorb energy during a collision. However, in the present invention, the hollow portion 3d is formed by joining the two halved members 3a and 3b, and the energy absorbing structure 5 is disposed here, so there is no possibility of this. Since the energy absorbing structure 5 is in the hollow portion 3d, it responds to the external force while sufficiently utilizing the bending deformation and bending buckling of the upright plate portion, and can quickly and reliably absorb the vehicle collision energy. Since the energy absorbing structure 5 is disposed between the front plate portion 30 and the connecting portion 21 in the hollow portion 3d, the FS characteristics up to the height of the energy absorbing structure 5 having the energy absorbing space 6 can be obtained. The rectangular wave utilized as the displacement of the can be formed, and the collision energy can be absorbed effectively. Since the energy absorption structure 5 can easily adjust the output of the FS characteristic by the plate thicknesses t ₁ and t ₂ of the upright plate portion 51 and the top plate portion 52 and the extension length thereof, The headrest substrate 1 can be easily manufactured.

Since the bending load of the standing plate portion 51 can be mainly absorbed in the elastic region, the energy absorbing structure 5 is not broken or damaged in that range, and can be reused if it is a light collision. Since the energy absorbing structure 5 is mainly composed of a bending load, it can withstand reuse unless broken.
Further, by inducing a compressive force in a specific direction by the support column 4, the energy absorbing structure 5 can effectively function even in a vehicle collision from various directions, and the collision energy can be stably absorbed. It is a headrest and a base material for headrest that have dramatically improved safety.

Furthermore, the connecting portion 21 is locked by the top plate portion 52 and the protruding portion 39, while the core recess 3b is fitted to the stay leg portion 20 so that the core member 3 is attached to the stay 2. The core 3 is rotated and slid to accommodate the energy absorbing space 6 smaller than the required stroke as shown in FIG. 5, and the headrest is difficult to secure a long compressor stroke AL. The headrest and the headrest base material 1 are suitable.
In addition, since the energy absorbing structure 5 is made of resin, the selection range of the molding method is widened from its simple shape. Moreover, integral molding with the core material 3 is possible, and the effect excellent in cost reduction and recycling is exhibited.

  The present invention is not limited to those shown in the above-described embodiments, and various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, size, number, etc. of the headrest base material 1, stay 2, core material 3, support column 4, energy absorption structure 5, energy absorption space 6, skin 7, foam 8 and the like are appropriately selected according to the application. it can.

It is one form of the base material for headrests of the present invention, and is the whole perspective view. FIG. 2 is an explanatory perspective view showing a state in which the headrest base material of FIG. 1 is housed in the epidermis. It is side surface sectional drawing of the headrest in which the base material for headrests was integrated. It is explanatory sectional drawing explaining the change which the base material for headrests of the headrest which concerns on FIG. 3 arises by a vehicle collision. It is explanatory sectional drawing of the headrest which showed the relationship between the compressor stroke and the energy absorption space at the time of a rear-end collision. It is a disassembled perspective view of the base material for headrests of another aspect which replaces FIG. It is a perspective view of the base material for headrests of another aspect different from FIG.1 and FIG.6. It is explanatory sectional drawing which shows a mode that the base material for headrests of FIG. 7 is assembled | attached. (B) is an explanatory cross-sectional view of the product of the present invention in which an energy absorbing structure is interposed between the stay and the core material, and (B) is a reaction force characteristic schematic diagram thereof. It is a FS characteristic comparison figure of this invention product and a conventional product. It is a schematic side view of the other goods of the energy absorption structure different from the energy absorption structure of FIG. It is explanatory drawing which showed the change of FS characteristic with respect to the compression direction. It is explanatory drawing of a prior art. It is explanatory drawing of a prior art. It is explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Headrest base material 2 Stay 20 Leg part 20a Upper end part 21 Connection part 211 Intermediate | middle part 3 Core material 3a Front part split material 3b Rear part split material 3d Hollow part 30 Front board part 30b Inner surface 39 Protrusion part 4 Support | pillar 41 Upper part 5 Energy absorption structure 51 Standing plate part 52 Top plate part
52a Top (vehicle rear side)
6 Space for energy absorption (space)
7 Skin 8 Foam HN Hinge L distance, distance between top plate and front plate
Central region between the intermediate part of the TR connection part and the front plate part

Claims (6)

A headrest base material embedded in the foam by integral foam molding of the headrest,
A stay in which upper end portions of a pair of leg portions are coupled by a connecting portion;
A pair of a rear half-split material and a front half-split material that has a plate shape and is recessed on the inner surface side are formed by forming a hollow portion by joining both half-split materials, and an upper portion of the stay is disposed in the hollow portion. A core material attached to the upper part,
In the hollow portion, a top plate portion in which a pair of upright plate portions face each other on the inner surface of the front plate portion arranged in the vertical direction in the longitudinal cross section of the front half member, and both tip portions thereof are connected. An energy absorbing structure disposed so that the top surface of the top plate portion is in contact with or close to the connecting portion;
A column that is erected on the inner surface of the front plate portion and has a height higher than that of the top surface;
In addition, the connecting portion is pushed by an external force, and a compressive force that tries to shrink between the connecting portion and the front plate portion is received by the plate surface of the top plate portion, and between the connecting portion, the top plate portion, and the front plate portion. In the process of reducing the distance, causing the vertical plate part to bend and deform, and further bringing the support column into contact with or close to the connecting part from above to narrow the space between the connecting part and the front plate part, A headrest base material that guides a connecting portion so as not to fall off the top plate portion . The heights of the connecting portions that are arranged in a confronting manner with the plate-like standing plate portions extending along the connecting portions, and are horizontally disposed in the vertical range of the top plate portion. The headrest substrate according to claim 1, wherein the point is set. The rear half member and the front half member are integrally formed through a thin-walled hinge portion, and further , a protrusion is provided on the inner surface of the rear half member, and by joining the both half members, The base material for headrests of Claim 1 or 2 which latches the said connection part with this protrusion part and the said top-plate part. The column is provided on the inner surface of the front plate portion of the central region with a central region between the intermediate portion of the connecting portion and the front plate portion, and the energy absorbing structures are arranged on both sides of the central region. The base material for headrests of any one of Claims 1 thru | or 3 provided. A pair of the standing plate portion and the top plate portion is a resin energy absorption structure that is substantially U-shaped in a side view, and the connecting portion is at a substantially intermediate position in the vertical direction of the top surface of the top plate portion, The base material for headrests of any one of Claims 1 thru | or 4 which contact | abuts or adjoins to the top | upper surface of the intermediate area of a substantially equal distance from a pair of standing board part. A bag-like skin, a stay in which the upper ends of a pair of leg portions are joined by a connecting portion, a core material attached to the upper portion of the stay, and the upper portion of the stay and the skin where the core material is disposed Injecting a foaming raw material, a foam that is foam-cured and integrated with the skin, the stay and the core, and a headrest comprising:
The core member is provided in a pair of a rear half member and a front half member whose inner surface side is recessed in a plate shape, and a hollow portion is formed by joining both half members, and the upper portion of the stay is formed in the hollow portion. And the core is attached to the upper part, and further, in the hollow part, on the inner surface of the front plate part arranged in the vertical direction in the longitudinal sectional view of the front half member, on the connecting part An energy absorbing structure in which a pair of plate-like standing plate portions extending along the opposite sides are opposed to each other and both end portions thereof are connected by the top plate portion, and the top surface of the top plate portion is brought into contact with the connecting portion. Set the height point of the connecting portion that is arranged in contact with or in close proximity and is horizontally disposed in the vertical range of the top plate portion , and further on the inner surface of the front plate portion from the top surface Standing up a tall post,
The connecting portion is pushed by an external force, and the compressive force to shrink the connecting portion and the front plate portion is received by the plate surface of the top plate portion, and the distance between the connecting portion, the top plate portion and the front plate portion In the process of causing the vertical plate portion to bend and deform, and further bringing the support column into contact with or close to the connecting portion from above to narrow the space between the connecting portion and the front plate portion. The headrest is characterized in that the portion is guided so as not to drop off from the top plate portion .

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