JP6663636B2 - Vehicle seat members - Google Patents

Description

  The present invention relates to a vehicle seat member, and more particularly, to a vehicle seat member in which a rigid member is not easily detached from a seat core, and the rigid member can be easily attached to the seat core.

  2. Description of the Related Art Conventionally, a vehicle seat member (hereinafter, sometimes simply referred to as a “seat member”) is formed by laminating a cushion material having excellent lightness and a seat core material. Further, for the purpose of increasing the strength of the seat member and attaching the seat member to another member, a rigid member formed of metal or the like is generally provided on the seat core material.

  Patent Literature 1 discloses a technique that discloses a technique of providing a rigid member on a sheet core material. Claim 1 of Patent Literature 1 states that “the raising member is formed of a foam molded body having higher compressive strength than the cushion material, and the frame member is partially embedded on one surface side in the thickness direction. Thus, a vehicle seat having a frame member embedded portion formed along the one surface is disclosed. More specifically, “the frame member 3 is formed using a wire-shaped material (hereinafter, referred to as a wire material), and is an outer periphery of a back surface of the cushion material 2 or a raising member 4 that raises the cushion material 2. (Patent document 1, paragraph No. 0026, column).

  The frame member 3 in Patent Literature 1 has an outer peripheral portion exposed portion 4a '(see FIG. 3 of Patent Literature 1) and a groove portion 41a (see FIG. 6 of Patent Literature 1). It is exposed downward.

Patent No. 5344395

  However, when a strong impact force is applied to the seat member in a state where the seat member is actually installed in a vehicle or the like, the frame member falls off from the seat core if the structure is as shown in Patent Document 1. There is a problem that it is easy to do.

  The problem to be solved by the present invention is to provide a seat member that can prevent the rigid member from detaching from the seat core even when a strong impact force is applied to the seat member, and that can be easily attached to the rigid member. To provide.

Means for solving the above-mentioned problems include:
(1) A seat member in which a cushion material and a sheet core material supporting the cushion material are laminated, wherein the sheet core material is formed of a foamed molded product having a compression modulus of 1 MPa or more and 20 MPa or less, and A groove is formed on the core material on the side of the laminated surface with the cushion material, a rigid member is housed in the groove, the rigid member is locked to a sheet core material, and a part of the rigid member is A vehicle seat member characterized by being exposed on the back side of a seat core material not in contact with a cushion material,
(2) The vehicle seat member according to (1), wherein the foamed molded product has a tensile strength of 0.1 MPa or more and 4 MPa or less,
(3) The vehicle seat member according to (1) or (2), wherein the groove includes a protrusion that locks the rigid member housed in the groove.
(4) The vehicle seat according to any one of (1) to (3), wherein the rigid member has an engagement portion exposed from a back surface of the seat core material. Department
(5) The vehicle seat according to any one of (1) to (4), wherein the rigid member is housed in a groove formed along a peripheral edge of a seat core material. Member
(6) The foam molded article forming the sheet core material is made of a foam molded article made of a polyolefin-based resin or a composite resin of a polyolefin-based resin and a polystyrene-based resin. The vehicle seat member according to any one of the preceding items.

  According to the present invention, even when a strong impact force is applied to the seat member, a groove is formed on the side of the seat core material on which the cushion material is laminated (hereinafter, may be simply referred to as “laminated surface”). Since the rigid member is housed in the groove and locked to the sheet core, the rigid member is reliably prevented from being detached from the sheet core. Further, since the rigid member is locked to the sheet core, it is not necessary to separately use a fixing member or the like for preventing the rigid member from detaching from the sheet core. Therefore, according to the present invention, it is possible to provide a seat member in which the mounting operation of the rigid member is simple.

FIG. 1 is a perspective view of a seat 1 with a backrest provided with a seat member 11 which is an example of the present invention. FIG. 2 is a longitudinal sectional view of the seat member 11 as an example of the present invention. FIG. 3 is a perspective view showing the lamination surface 15 side of the seat core 12 in the seat member 11 which is an example of the present invention. 4A and 4B show an example of a mounting structure of the rigid member 20 in the groove 21a. FIG. 4A is a plan view of the sheet core 12 viewed from the laminating surface 15 side, and FIG. 4A is a cross-sectional view taken along line A1-A1, and FIG. 4C is a cross-sectional view taken along line B1-B1 in FIG. 5A and 5B show an example of a mounting structure of the rigid member 20 in the groove 21b. FIG. 5A is a plan view of the sheet core 12 viewed from the laminating surface 15 side, and FIG. 5A is a sectional view taken along line BB in FIG. 5A, and FIG. 5C is a sectional view taken along line CC in FIG. 5A. FIG. 6 shows an example of a mounting structure of the rigid member 20 in the groove 21c. FIG. 6A is a partially transparent view of the rigid member 20 and the sheet core 12, and FIG. 6B is a sheet core. FIG. 6C is a plan view of the structure 12 viewed from the stacking surface 15 side, and FIG. 6C is a sectional view taken along line DD in FIG. 6A. 7A and 7B show an example of a mounting structure of the rigid member 20 in the groove 21d, FIG. 7A is a partially transparent view of the rigid member 20 and the sheet core 12, and FIG. 7B is a sheet core. FIG. 7C is a plan view of the sheet core 12 observed from the lamination surface 15 side, and FIG. 7C is a bottom view of the sheet core 12 observed from the back surface 16 side. FIG. 8 is a plan view showing an example of a sheet core member having a groove for accommodating a rigid member functioning as a frame member.

  The present invention will be specifically described with reference to the drawings.

  FIG. 1 shows a seat 1 with a backrest. The seat 1 with a backrest includes a backrest portion 2 that contacts the back of the user when the user sits down, and a seat portion 3 that contacts the buttocks of the user when the user sits down. The vehicle seat member of the present invention can be used as a member forming the backrest portion 2 and the seat surface portion 3, and particularly, the vehicle seat member of the present invention can be suitably used as a member forming the seat surface portion 3. it can.

  FIG. 2 shows an example of the seat member 11 of the present invention used as a member forming the seat surface portion 3. As shown in FIG. 2, the seat member 11 is configured by laminating a seat core 12, a cushion 13, and a skin 14 in this order. When the seat member 11 is used, the seat core 12 is located at the lowermost position, the skin 14 is located at the uppermost, and the buttocks of the user are in contact with the skin 14. The outer peripheral surface of the seat core member 12 has a curved laminated surface 15 in contact with the cushion member 13 and a rear surface 16 formed on the lower side and formed in a shape adapted to the mounting surface of the vehicle without being in contact with the cushion member. Consists of The seat core 12 includes a buttocks receiving recess 17a on the side closer to the backrest 2 of the laminated surface 15, in other words, on the rear side of the laminated surface 15, that is, on the rear side when mounted on a vehicle. The bulging portion 17b can be provided on the side farther from the vehicle, that is, on the front side of the laminated surface 15, that is, on the front side when mounted on the vehicle. When the seat member 11 of the present invention is used in a vehicle by forming the buttocks receiving recessed portion 17a and the raised portion 17b in this way, when the occupant's buttocks sink from the seat and try to move forward when the vehicle crashes. In addition, the forward raised portion 17b acts as a resistance, so that the occupant can be effectively prevented from moving forward. In addition, since the thickness of the sheet core 12 is increased by having the raised portion 17b, the thickness of the cushion material 13 laminated on the upper side of the sheet core 12 can also be reduced.

  The cushion material 13 is located outside the sheet core 12 so as to cover the lamination surface 15 of the sheet core 12. The cushion material 13 has a function of absorbing the load by being elastically deformed when a load is applied, for example, when the user sits on the seat 1 with a backrest. The material constituting the cushion material 13 is preferably a foamed molded product of a thermosetting resin, and is preferably a material having a lower compressive strength than the sheet core material 12. Examples of the foamed molded article of the thermosetting resin include a soft urethane foam, which is a molded article of a polyurethane foam made of a polyurethane resin. More specifically, a foaming agent is added to a liquid raw material obtained by mixing a polyol and a diisocyanate, and the raw material is filled in a molding die and foamed to obtain a cushion material 13 made of a polyurethane foam. . In the present invention, by using the cushion member 13 and the seat core member 12 in combination, the thickness of the cushion member 13 can be reduced and the amount of the cushion member used can be reduced, and the weight of the seat member 11 can be reduced. Can be reduced in weight. When the seat member 11 is used as a vehicle seat member, the thickness of the cushion material 13 may be approximately 50 mm to 150 mm.

  It is preferable that the cushion material 13 is formed so that a part of the seat core 12 is fitted in a part of the surface of the cushion core 13. For example, on the contact surface of the cushion material 13 in contact with the sheet core material 12 and on the laminated surface 15 of the sheet core material 12, corresponding uneven shapes are provided, and the cushion materials 13 are fitted so that these uneven shapes are fitted. When the sheet core 12 and the sheet core 12 are laminated, the displacement between the cushion 13 and the sheet core 12 is prevented.

  The skin material 14 is formed so as to cover the outer surface of the cushion material 13. The skin material 14 has a function of protecting the outer surfaces of the cushion material 13 or the sheet core 12 and preventing dirt and the like from adhering to these outer surfaces. The material of the skin material 14 is not particularly limited, and may be, for example, a cloth, a knit, a moquette, or a woven fabric.

  It is preferable that the cushion material 13 and the skin material 14 have a shape that covers the lamination surface 15 of the sheet core material 12 with an even thickness. With such a shape, the shape formed on the laminated surface 15 of the sheet core 12 is reproduced also on the surface of the skin material 14 that is in contact with the user's buttocks. In other words, a shape corresponding to the buttocks-housing recess 17a and the protruding portion 17b is also formed on the surface of the skin material 14 with which the user actually contacts.

  The seat member 11 is formed by laminating at least the cushion material 13 and the seat core material 12, but may include other members such as the skin material 14.

As a constituent material of the sheet core material 12, a polyolefin resin such as a polyethylene resin, an ethylene-vinyl acetate copolymer, and a polypropylene resin, polystyrene, butadiene-modified polystyrene (including impact-resistant polystyrene), and styrene-methacrylic acid are used. Examples include polystyrene resins such as methyl copolymers and styrene-acrylonitrile copolymers, acrylic resins such as polymethyl methacrylate, and composite resins of polyolefin resins and polystyrene resins. The constituent material of the sheet core 12 can be composed of only one of these resins, or can be composed of two or more resins.
The sheet core 12 is made of a foamed molded body. The foamed molded body is obtained by, for example, adding a foaming agent to the above-described resin that is a constituent material of the sheet core material 12 and performing foam molding. The foamed molded body forming the sheet core 12 may contain various additives such as a coloring agent in addition to the various resins described above.

  Among these resins, it is preferable to use a polyolefin-based resin or a composite resin of a polyolefin-based resin and a polystyrene-based resin from the viewpoint of strength and impact resistance. Further, as the polyolefin resin, a polypropylene resin and a polyethylene resin are preferable, and a polypropylene resin is particularly preferable. When a polyolefin-based resin is used, it becomes easy to produce a foam molded article having a specific compression modulus.

  In addition, as said polypropylene resin, a propylene homopolymer, the copolymer of propylene and another comonomer, or a mixture thereof is mentioned, for example. Examples of the copolymer of propylene and another comonomer include a propylene-ethylene copolymer and a propylene-ethylene-butene copolymer.

  When the foamed molded body is formed of a polyolefin resin, the apparent density of the foamed molded body forming the sheet core 12 is preferably 20 g / L to 200 g / L. In addition, if the apparent density is within the above range, the foamed particle molded article made of a polyolefin-based resin is excellent in strength and impact resistance as a sheet core material, and has appropriate elasticity, so that the rigidity of the rigid member can be improved. Will also be excellent. In view of the above, the apparent density of the foam molded article is preferably 25 to 100 g / L, and more preferably 30 to 80 g / L. It should be noted that a plurality of foamed moldings having different apparent densities may be combined to form one foamed molding. In this case, it is sufficient that the average apparent density of the entire foamed molded article falls within the above numerical range. Here, the apparent density can be determined by a submersion method using an increase in volume of water when the foam molded article is submerged.

The foamed molded body forming the sheet core 12 has a compression elastic modulus of 1 MPa or more and 20 MPa or less. When the compression modulus is in the above numerical range, when the rigid member 20 is stored in the groove in the sheet core 12, the sheet core 12 can be appropriately elastically deformed to lock the rigid member, It is preferable because it has strength not to be destroyed by impact.
In addition, from the above viewpoint, the compression elastic modulus of the foamed molded body forming the sheet core 12 is more preferably 2 MPa or more and 15 MPa or less, and still more preferably 3 MPa or more and 10 MPa or less.

  The compression elastic modulus of the foam molded body forming the sheet core material 12 is obtained by cutting a test piece having a length of 50 mm, a width of 50 mm and a thickness of 50 mm from the foam molded article and using the test piece in accordance with JIS K 7220 (2006). Obtained by performing a compression test.

  Further, it is preferable that the tensile strength of the foamed molded body is 0.1 MPa or more and 4 MPa or less. As the tensile strength, a value measured based on a test standardized by JIS K6767 (1999) can be adopted. When the tensile strength is within the above range, a technical effect is obtained in that detachment of the rigid member is less likely to occur.

  Specifically, a test piece of a foam molded article having a dumbbell-like shape was attached to a tensile tester so that the distance between the clamps was 90 mm, and a load was applied at a tensile speed of about 51 mm per minute, and the test piece was broken. The load at the time of performing is measured, and the tensile strength can be calculated from the obtained measured value.

  In addition, a groove 21 is formed on the lamination surface 15 side of the sheet core 12 in contact with the cushion material 13, and a rigid member 20 is housed in the groove 21 and is locked to the sheet core 12.

  When the seat member 11 is used as a vehicle seat member, the rigid member 20 is housed in the groove 21 from the lamination surface 15 side of the seat core 12, while the rigid member 20 on the back surface 16 side of the seat core 12. The exposed portion that is a part of the portion 20 functions as an engagement portion with the vehicle, so that the seat member 11 and the vehicle are connected and fixed. In the vehicle seat member, the impact force is locally concentrated on the exposed portion of the rigid member 20 connected to the vehicle. Therefore, when the rigid member 20 is fixed by forming the groove 21 on the back surface 16 side of the seat core 12, the rigid member 20 is detached from the seat core 12 when an impact is applied to a connection portion with the vehicle. There was a risk of doing so. In the present invention, the groove 21 is formed on the lamination surface 15 side of the sheet core 12, and the rigid member 20 is housed in the groove 21, so that the impact force applied to the exposed portion of the rigid member 20 is reduced by the rigid member 20. It can be absorbed by the entire bottom of the stored groove 21 portion. Therefore, it is possible to reliably prevent the rigid member 20 from falling off from the sheet core 12.

The rigid member 20 accommodated in the groove 21 of the sheet core 12 may be used as a frame member having a function as a reinforcing member for reinforcing the strength of the sheet core 12. Further, one rigid member 20 may have both a function as a frame member and a function as an engagement member for connecting and fixing the seat member and the vehicle.
As the rigid member 20, a wire, a pipe, a plate-like member, a linear member, or the like formed of a metal or a resin is used. However, the rigid member 20 is not limited to these forms as long as it has sufficient strength. Known components can be used. Further, the cross-sectional shape of the rigid member 20 is not limited to a circle, and may be, for example, a polygon.

In the seat member 11 of the present invention, the rigid member 20 is preferably used as a frame member for reinforcing the strength of the seat core 12. In order for the rigid member 20 to function as a frame member, it is preferable that the rigid member 20 has a shape that can be arranged on at least one edge of the sheet core 12. More specifically, it is preferable that the rigid member 20 is formed in, for example, a rectangular shape so that the rigid member 20 can be arranged on the entire peripheral edge of the sheet core material. The rigid member 20 formed in a shape along the peripheral edge of the sheet core is accommodated in a groove 21 formed substantially in the same shape as the rigid member 20 along the peripheral edge of the sheet core 12.
When the groove 21 is formed on at least one of the peripheral edges of the laminated surface 15 of the seat core 12 and the rigid member 20 is housed and locked in the groove 21, the strength of the entire seat member 11 can be improved. it can. Furthermore, if the rigid member 20 formed in a shape along the peripheral edge of the sheet core 12 is accommodated in the groove 21 formed in a rectangular shape over the entire peripheral edge of the laminated surface 15 of the sheet core 12, The strength of the entire seat member 11 can be further improved.

  Although the depth of the groove 21 is not particularly limited, it is sufficient that the depth is at least such that the rigid member 20 does not protrude from the laminated surface 15 when the rigid member 20 is inserted into the groove 21. In other words, in a state where the rigid member 20 is inserted into the groove 21, the depth may be such that the entire cross-sectional shape of the rigid member 20 is embedded in the groove 21. The length and shape of the groove 21 are not particularly limited, but are preferably formed in accordance with the length and shape of the rigid member 20 to be stored.

  A specific mode of locking the rigid member 20 to the sheet core 12 will be described below. However, the manner of locking the rigid member 20 is not limited to the following specific examples.

  Specifically, as shown in FIG. 3, a groove 21 a is a specific example of the groove 21 on a lamination surface 15 (hereinafter, may be referred to as an “upper surface”) of the sheet core 12 in contact with the cushion material 13. , 21b, 21c, and 21d are provided. The groove 21 is formed so that the rigid member 20 can be housed therein. The rigid member 20 housed in the groove 21 is locked to the sheet core 12 inside the groove 21.

  Further, the groove 21 needs to be formed on the lamination surface 15 side of the sheet core material 12 in contact with the cushion material 13, in other words, on the upper surface side. When the groove 21 is formed on the upper surface side and the rigid member 20 is inserted from the upper surface side, an impact is applied to the exposed portion of the rigid member 20 on the back surface 16 (hereinafter, sometimes referred to as “lower surface”). However, it is difficult for the rigid member 20 to be detached from the sheet core 12. The ratio of the area occupied by the groove 21 to the entire stacking surface 15, the position where the groove 21 is formed, the number of the grooves 21 formed on the stacking surface 15, and the like are not particularly limited.

  As shown in FIG. 3, it is preferable that the seat core 12 has a large thickness at a portion where the thigh of the occupant contacts, and a small thickness at a portion where the buttock contacts. In the example shown in FIG. 3, the vicinity of the edge where the groove 21c and the groove 21d are provided corresponds to the portion where the thigh of the occupant is in contact, and the vicinity of the edge where the groove 21a and 21b is provided is the portion where the buttocks of the occupant are in contact. Corresponding. The thickness of the sheet core 12 at the part where the buttocks touch is preferably 0 to 100 mm, more preferably 5 to 70 mm. A thickness of 0 mm indicates that a hole is provided in a part of the sheet core 12. In order to provide a hole in a part of the sheet core, at least a part of the groove 21 may be opened also on the back surface 16 side. Further, the difference between the thickness of the sheet core 12 where the buttocks touch and the thickness of the portion where the thighs touch is preferably 20 to 200 mm, and preferably 30 to 170 mm to prevent the occupant from slipping out. More preferred. In addition, the average thickness of the sheet core material 12 obtained excluding the holes is preferably 30 to 200 mm, and more preferably 50 to 180 mm.

  As shown in FIG. 4A, the groove 21a, which is an example of the groove 21, has an operation portion 23a and a locking portion 23b. In the A1-A1 cross-sectional view shown in FIG. 4B, the operation unit 23a is formed in a substantially rectangular shape with one side of the opening 25a provided in the stacking surface 15. The rigid member 20 is positioned so as to be in contact with the lower surface of the operation unit 23a. In FIG. 4A, the rigid member 20 is observed in a part of the operation part 23a, and the bottom of the groove is observed in the other part. The size of the operation unit 23a is not particularly limited, but may be large enough to allow the user's finger to enter the operation unit 23a when the user attaches or detaches the rigid member 20. The provision of the operation section 23a makes it possible to provide a seat member in which the mounting operation of the rigid member is simple and the manufacturing cost is low. In the present invention, an opening may be formed on the lamination surface side of the sheet core 12 so that the rigid member 20 can be inserted from the upper surface of the sheet core 12.

  As shown in the B1-B1 cross-sectional view in FIG. 4C, the protrusion protrudes at the locking portion 23b so as to prevent the rigid member 20 from being inserted into the holding portion 24b and detached from the holding portion 24b. A part 24a is provided. The protrusion 24a may be formed on at least one side of the inner wall surface of the groove 21a, and may be provided to face the rigid member therebetween. The convex portion 24a may be formed in a part of the groove 21a as long as the rigid member can be held, or along the axial direction of the groove 21a, in other words, along the direction orthogonal to the groove width direction. , May be formed on the entire wall surface of the groove 21a. In FIG. 4C, a protrusion 24 is provided so as to protrude laterally from the side wall of the groove, that is, in the groove width direction. An opening 25b is provided on the upper surface end of the convex portion 24a on the same plane as the lamination surface 15, and a holding portion 24b is provided on the lower surface end of the convex portion 24a. The shape and size of the holding portion 24b are not particularly limited as long as the size can accommodate the rigid member 20. The space between the vertices of the two convex portions 24a provided on the left and right in FIG. 4C corresponds to the portion where the rigid member 20 is observed in the locking portion 23b in FIG. 4A. The shape of the convex portion is not particularly limited, and may be any shape as long as the rigid member 20 can be locked. For example, the cross-sectional shape of the convex portion may be a semicircular shape or a polygonal shape, and examples of the polygonal shape include a rectangular shape, a triangular shape, and a trapezoidal shape. In the example of FIG. 4C, the cross-sectional shape of the projection is substantially semicircular.

  When storing the rigid member 20 in the groove 21a, the rigid member 20 reaches the holding portion 24b after the convex portion 24a is elastically deformed. Then, after the rigid member 20 reaches the holding portion 24b, the rigid member 20 is locked to the sheet core member 12 by returning to the original shape from the state in which the convex portion 24a is elastically deformed. The rigid member 20 accommodated in the holding portion 24b is prevented from being detached toward the opening 25b by the convex portion 24a, and the rigid member 20 is locked to the sheet core 12. In order to achieve the above effects, the sheet core material 12 may be formed of a foamed particle molded body having a compression elastic modulus of 1 MPa or more and 20 MPa or less.

  As another mode in which the rigid member 20 is locked in the sheet core 12, there is a mode shown in FIG. 5A, and the groove 21 b has a guide portion 33 a and an operation portion 35 a. As shown in FIG. 5B, the guide portion 33a is a groove that extends vertically downward from the opening 35 provided on the same plane as the lamination surface 15. The guide portion 33a has a function of guiding the rigid member 20 to the holding portion 34b when the rigid member 20 is inserted into the groove 21b. The operation unit 35a has a lower surface on the same plane as the lower surface of the guide unit 33a, and extends in a direction perpendicular to the guide unit 33a. A part of the upper surface of the operation unit 35a is open on the same plane as the lamination surface 15 as shown in FIG.

  As shown in FIG. 5B, a protrusion 34a is formed in a part of the groove 21b. When the rigid member 20 is inserted into the groove 21b, the rigid member 20 moves down the guide portion 33a, and then moves so as to be displaced at least in the lateral direction when reaching the bottom surface of the groove 21b. , And is disposed on the holding portion 34b provided at the back. When the rigid member 20 is disposed on the holding portion 34b, the rigid member 20 is locked by the convex portion 34a, so that the rigid member 20 is prevented from being detached from the opening 35.

  As another mode in which the rigid member 20 is locked in the sheet core 12, there is a mode shown in FIG. 6A, and the groove 21 c has a through portion 42 and an operation portion 43 b. The penetrating portion 42 penetrates from the lamination surface 15 to the back surface 16, and the operation portion 43 b opens on the lamination surface 15 but does not open on the back surface 16. As shown in FIG. 6C, the operation unit 43b extends downward from the opening 45 and has a second opening 46 having an inner diameter smaller than the opening 45 on the way. A convex portion 44a is provided on the inner side surface below the second opening 46, and a holding portion 44b is provided further below. The space formed between the vertices of the two convex portions 44a in FIG. 6C corresponds to the portion where the rigid member 20 is observed in the operation unit 43b in FIG. 6B. In the operation part 43b of FIG. 6B, in the part other than the part where the rigid member 20 is observed, the bottom of the groove and the protrusion 44a on the same plane as the second opening 46 are observed. Since the rigid member 20 inserted into the groove 21c is locked by the convex portion 44a and the holding portion 44b, the rigid member 20 is prevented from being detached from the sheet core 12.

  In the example in FIG. 6, the rigid member 20 is provided between the two horizontal portions 47, the two vertical portions 48 extending vertically downward from the two horizontal portions 47, and the two vertical portions 48, and has a U-shape. And a bent portion 49. As shown in FIG. 6 (a), when the rigid member 20 is inserted into the groove 21c, the two horizontal portions 47 are respectively disposed in the locking portions 43b, and the two vertical portions 48 and the curved portion 49 are formed through the penetrating portions. 42. Further, an exposed portion is formed such that a part of the two vertical portions 48 and the curved portion 49 project from an opening provided on the back surface 16 side of the through portion 42. The rigid member 20 exposed from the back surface 16 functions as an engaging portion. For example, the seat member 11 of the present invention is fixed to the vehicle by connecting the engaging portion, which is an exposed portion of the rigid member 20, to an engaging metal fitting provided on the vehicle side.

  Further, as another embodiment in which the rigid member 20 is locked in the sheet core 12, there is an embodiment shown in FIG. 7A, and the groove 21 d is formed by the first penetration penetrating to the back surface 16 of the sheet core 12. It has a portion 51a, two second penetration portions 51b, and a holding portion 52b. In the example in FIG. 7, the rigid member 20 includes two horizontal portions 57, two vertical portions 58a extending vertically downward from one end of the two horizontal portions 57, and a portion between the two vertical portions 58a. In addition to the curved portion 59 provided and bent in a U-shape, it has two second vertical portions 58b extending vertically downward from the other ends of the two horizontal portions 57. When the rigid member 20 is inserted into the groove 21d, a part of the two vertical portions 58a and the curved portion 59 protrude from the first penetrating portion 51a toward the back surface 16 to form an exposed portion. Further, the two horizontal portions 57 are arranged so as to press the lower surface of the holding portion 52b. Further, the two second vertical portions 58b are located in the second penetrating portions 51b, and as shown in FIG. 7C, the ends of the second vertical portions 58b are provided on the back surface side of the sheet core 12. It is exposed from the back opening. In the example in FIG. 7, the back surface opening on the back surface 16 side of the second penetrating portion 51 b is provided so as to be raised from the back surface 16 of the sheet core 12, but is flush with the back 16 of the sheet core 12. It may be provided.

  In the example in FIG. 7, as an example of locking the rigid member 20 in the second penetrating portion 51b, the rigid member 20 is stored in the holding portion 52b, and the second member is exposed from the second penetrating portion 51b to the back surface 16 side. A screw groove is provided on the outer peripheral surface on the end surface side of the second vertical portion 58b, and a screw is attached near the end surface of the second vertical portion 58b exposed to the rear surface 16, so that the rear surface 16 and the screw are caught. An example in which the linear rigid member 20 is engaged with the sheet core member 12 without being detached from the opening 55 is exemplified.

  When the rigid member 20 of the present invention is provided on the vehicle seat core 12, at least a part of the rigid member 20 is exposed on the back surface 16 side of the seat core 12. The rigid member 20 exposed on the back surface 16 side of the seat core 12 functions as an engaging portion, so that the engaging portion can be connected to the vehicle body or the like, and the seat member 11 can be fixed. For example, as in the case of the curved portions 49 and 59 in FIGS. 6 and 7, it is sufficient that a part of the rigid member 20 protrudes from the back surface 16.

Further, the rigid member 20 shown in FIGS. 4 and 5 can be used as a part of the frame member. For example, the rigid member 20 shown in FIGS. 4 and 5 may be further extended, and a part of the rigid member 20 may be exposed from the back surface 16 of the sheet core 12 at any one of the positions. More specifically, the rigid member 20 shown in FIGS. 4 and 5 is connected to the horizontal portion 47 shown in FIG. 6 so that the rigid member shown in FIGS. The rigid member 20 may be made to protrude from the back surface 16 through a through-hole formed in the sheet member 12 by forming a curved portion 49 connected to the horizontal portion 47 so as to function.
For example, when the rigid member 20 is used as a frame member, the rigid member 20 formed into a shape along the peripheral edge of the sheet core 12 is adjusted according to the shape of the rigid member 20 as shown in FIG. What is necessary is just to house in the groove 21 formed along the periphery of the core material 12.

  The rigid member 20 is housed and locked in a groove 21 provided on the laminated surface 15 side of the sheet core 12. The mode in which the rigid member 20 is locked to the sheet core 12 is not limited to the examples in FIGS. 4 to 7 described above. For example, a concave portion substantially matching the shape of the rigid member 20 is provided in the groove 21. The rigid member 20 may be prevented from detaching from the groove 21 by being fitted and held in the concave portion.

  Next, a method for manufacturing the seat member 11 of the present invention will be described.

  From the viewpoint of the degree of freedom of the shape, it is preferable to use a foamed particle in-mold molded body as the foamed molded body constituting the sheet core 12. In addition, the foamed-particle in-mold molded product is obtained by filling a mold with foamed particles obtained by a known method and performing in-mold molding. Further, the shape of the foam molded article can be appropriately changed according to the shape of the mold.

  In addition, as the groove 21 formed on the lamination surface side of the sheet core 12, it may be formed in a mold using a mold designed so that the groove 21 is formed in advance, or the groove 21 may be formed. The groove 21 may be provided by molding a foamed molded body which is not provided, and cutting the laminated surface 15 of the foamed molded body.

  Next, the rigid member 20 is locked to the sheet core 12 by inserting the rigid member 20 into the groove 21 of the sheet core 12. For example, in the example in FIG. 4, the rigid member 20 is inserted into the groove 21a in a direction substantially perpendicular to the lamination surface 15. When the rigid member 20 is pushed from the opening 25b, the rigid member 20 reaches the holding portion 24b by pushing the rigid member 20 more strongly, although there is resistance due to the convex portion 24a of the locking portion 23b. When the rigid member 20 reaches the holding portion 24b, the rigid member 20 is locked by the convex portion 24a, so that the rigid member 20 is prevented from detaching from the sheet core 12.

  In the example in FIG. 5, the rigid member 20 is inserted into the groove 21b in a direction substantially perpendicular to the lamination surface 15. After the rigid member 20 is first moved downward along the guide portion 33a, the rigid member 20 is moved in the horizontal direction along the bottom surface of the groove 21b. When the rigid member 20 is moved in the horizontal direction, it is repelled by the convex portion 34a on the way, but when the rigid member 20 is further pushed in, the rigid member 20 is disposed on the holding portion 34b beyond the convex portion 34a. Since the rigid member 20 that has reached the holding portion 34b is prevented from being detached from the opening 35 by the convex portion 34a, the rigid member 20 is locked to the sheet core 12.

  In the example in FIG. 6, the rigid member 20 is inserted into the groove 21c in a direction substantially perpendicular to the lamination surface 15. When the rigid member 20 is inserted, if the curved portion 49 is positioned right above the through portion 42, the curved portion 49 can smoothly penetrate the opening on the back surface 16 side of the through portion 42. . When the rigid member 20 is inserted, the horizontal portion 47 moves downward from the second opening 46, and the horizontal portion 47 is repelled by the convex portion 44a provided on the inner surface of the groove. When the rigid member 20 is pushed in by further applying a force against the repulsion, the horizontal portion 47 is disposed on the holding portion 44b beyond the convex portion 44a. When the horizontal portion 47 is disposed on the holding portion 44b, the rigid member 20 is prevented from being detached from the opening 45 by the convex portion 44a and the holding portion 44b. Will be done.

  In the example in FIG. 7, the rigid member 20 is inserted into the groove 21d in a direction substantially perpendicular to the lamination surface 15. When the rigid member 20 is inserted, the curved portion 59 is located directly above the first through portion 51a, and the end surface of the second vertical portion 58b is located directly above the second through portion 51b. The member 20 is smoothly inserted into the groove 21d.

  After the rigid member 20 is inserted into the groove 21, the cushion member 13 and the skin material 14 are laminated on the surface of the seat core 12 in this order, whereby the seat member 11 can be obtained. The method of laminating and fixing the cushion material 13 and the skin material 14 is not particularly limited, and a conventionally known method can be used.

  When attaching the seat member 11 of the present invention to a vehicle body or the like of an automobile, the seat is formed by engaging a curved portion of the rigid member 20 exposed from the back surface 16 with a fixing bracket or the like provided on the vehicle body of the automobile. What is necessary is just to fix the member 11 to a vehicle body. For example, the seat member 11 can be fixed to the vehicle body by engaging a fixture such as a hook provided on the vehicle body with the inside of the curved portions 49 and 59 of the rigid member 20.

  The rigid member used as the frame member can be fixed to the sheet core material by adopting the above-described fixing method and changing the length and shape of the groove.

  Hereinafter, the seat member of the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

(Example 1)
A mold was filled with foamed particles of a polypropylene resin (expansion ratio: 30 times, foamed particle diameter: 4 mm), and in-mold molding was performed by steam heating. In the heating method, steam is supplied for 5 seconds in a state in which the drain valves of both sides are opened, preheating (exhausting step) is performed, and then one side is heated at a pressure of 0.22 MPa (G), and then 0.26 MPa. After one-side heating was performed from the opposite direction by the pressure of (G), main heating was performed from both sides by a pressure of 0.30 MPa (G). After the heating, the pressure was released, air-cooled for 30 seconds, and water-cooled for 240 seconds to obtain a foamed molded article made of a polypropylene resin (hereinafter, sometimes referred to as “foamed molded article A”). The obtained foamed molded article A had the shape shown in FIG. 3, and had a length of 1300 mm, a width of 450 mm, and a thickness of 150 mm.

  In addition, the groove 21c of the shape shown in FIG. 6 was provided by performing a cutting process on the lamination surface side, in other words, the upper surface side of the foaming molded article A. The foam molded article A provided with the groove 21c was used as a sheet core material in the following experiments.

  A metal wire having a diameter of 5 mm, which is a rigid member, was inserted into the groove 21c of the sheet core, and the rigid member was locked to the sheet core. A cushion material made of a soft urethane resin foam having a thickness of 80 mm was adhered to such a sheet core material, and covered with a fabric material seat cover as a skin material to obtain a seat member.

(Example 2)
A foam molded article was obtained in the same manner as in Example 1, except that foam particles made of a mixed resin of polyethylene and polystyrene were used. In the sheet core material provided with the groove 21c in the obtained foam molded body, a rigid member was locked in the groove 21c.

(Example 3)
A sheet core material was obtained in the same manner as in Example 1 except that a groove 21d having the shape shown in FIG. 7 was provided in the foamed molded body using a rigid member having the shape shown in FIG. The rigid member was locked in the groove 21d of the sheet core.

(Comparative Example 1)
A sheet core material was obtained in the same manner as in Example 1 except that the grooves were formed on the back surface side of the foam molded body, in other words, on the lower surface side. The rigid member was locked in the groove of the obtained sheet core material.

(Measurement of compression modulus)
A test piece having a length of 50 mm, a width of 50 mm, and a thickness of 50 mm was cut out from the foamed molded article, and a compression test was performed using the test piece according to JIS K 7220 (2006) to determine a compression modulus.

(Measurement of tensile strength)
According to JIS K6767 (1999), a dumbbell-shaped test piece cut out from a foamed particle molded article was attached to a tensile tester so that the distance between clamps was 90 mm, and a load was applied at a tensile speed of about 50 mm / min. The tensile strength was calculated from the load value when the piece broke.

(Load resistance test)
In each seat member, after the rigid member was housed in the groove portion, a fitting assuming an engagement fitting on the vehicle side was connected to the curved portion of the rigid member shown in FIGS. A load equal to 20 times the mass of the seat portion was horizontally applied to the fitting in a direction opposite to each seat member. The results are shown in Table 1 above. After the impact was given, the case where the groove portion of the foamed particle molded body was not broken was evaluated as O, and the case where the groove portion of the foamed particle molded product was broken was evaluated as x.

DESCRIPTION OF SYMBOLS 1 Seat with a backrest 2 Backrest part 11 Seat member 12 Seat core material 13 Cushion material 14 Skin material 15 Laminated surface 16 Back surface 17a Buttocks accommodation recessed portion 17b Ridge portion 20 Rigid members 21, 21a, 21b, 21c, 21d Grooves 23a, 35a, 43b 45a Operating part 23b Locking parts 24a, 34a, 44a Convex parts 24b, 34b, 44b, 52b Holding parts 25a, 25b, 35, 45, 55 Opening 33a Guide part 42 Penetrating part 46 Second opening 47, 57 Horizontal Part 48, 58a Vertical part 49, 59 Curved part 51a First penetration part 51b Second penetration part 58b Second vertical part

Claims (3)

A seat member in which a cushion material and a sheet core material supporting the cushion material are laminated, wherein the sheet core material has a compression elastic modulus of 1 MPa or more and 20 MPa or less, and a tensile strength of 0.1 MPa or more and 4 MPa or less. made of foamed particles form a molded body, the lamination surface side of the cushion member in said seat core member, is formed with a groove in a ring shape along the peripheral edge side of the sheet core material, the strength of the sheet core material as the frame member for reinforcing, rigid member formed in an annular shape is held fitted into the groove, the rigid member is engaged with the seat core member, a portion of the rigid member and the cushion member A seat member for a vehicle, comprising an engaging portion exposed on the back surface side of the seat core material that does not contact. 2. The vehicle seat member according to claim 1, wherein the groove includes a convex portion that locks the rigid member fitted and held in the groove. 3. The foamed molded to form a sheet core material, polyolefin resin, or a vehicle seat element according to claim 1 or 2, characterized in that a composite resin of polyolefin resin and polystyrene resin.

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