JP2019098808A - Bead foam molding member for vehicular sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bead foam molding member which suppresses deformation during molding in a bead foam molding member which is a cushion member inserted on a side opposite to a seating surface of a resin foam molded body which is a cushion material of a vehicle sheet. SOLUTION: This is a bead foam molded member 20 integrated in a layer on the side opposite to the seating surface of a cushion pad 1 which is a cushion material of a vehicle seat. When the bead foam molding member 20 is viewed from a direction substantially perpendicular to the seating surface, a frame-shaped frame 23 is inserted and formed in the outer peripheral edge portion of the bead foam molding member 20. In the region surrounded by the frame 23 of the bead foam molded member 20, there are a central horizontal through hole 25, a left and right horizontal through hole 26, a central vertical through hole 27, and a left and right vertical through hole 28, which are slit-shaped through holes penetrating in the thickness direction. It is provided. [Selection diagram] Fig. 3

Description

  The present invention relates to a bead foam molded part for a vehicle seat.

  Conventionally, a two-layered pad body is known as a cushioning material for a vehicle seat. Patent Document 1 below discloses a pad body in which a cushion member, which is a foam obtained by foam molding of an AS resin (copolymer of acrylonitrile and styrene), is insert-molded on the opposite side of the seating surface of polyurethane foam obtained by foam molding of polyurethane resin. It is done. Usually, in manufacturing this pad body, a lower mold and an upper mold are provided, and when the upper mold is closed to the lower mold, a cavity corresponding to the shape of the pad body is formed between the lower mold and the upper mold. Use the The cavity surface of the lower mold is formed in a shape corresponding to the shape on the seating surface side of the pad body, and the cavity surface of the upper mold is formed in a shape corresponding to the shape opposite to the seating surface of the pad body. The surface of the upper mold on the side opposite to the seating surface of the cushion member is mechanically fitted or the magnetic force acting between the magnet embedded on the upper mold cavity surface and the iron member inserted in the cushion member is temporary. While held, the foamed polyurethane resin raw material is injected into the cavity surface of the lower mold, and the upper mold is closed with respect to the lower mold to foam and form a pad body.

JP, 2010-125138, A

  In the pad body described in Patent Document 1 described above, it is necessary that the surface opposite to the seating surface of the cushion member abuts on the cavity surface of the upper mold without any gap in the foam molding step of the polyurethane foam raw material. is there. In the process of foaming and curing of the foamed polyurethane resin material, if there is a gap between the cavity surface of the upper mold and the opposite surface to the seating surface of the cushion member, a part of the foamed polyurethane resin material penetrates the gap and the foam is cured Do. Then, a part of the foamed polyurethane resin raw material is cured in the non-foamed state in the gap, so that the foamed polyurethane resin raw material forming the pad body may be insufficient to cause a chipping inside the pad body. In addition, if the amount of the foamed polyurethane resin raw material is increased in order not to cause the shortage, the material cost and the weight of the pad body will be increased. In order to prevent this, it is necessary for the cushion member to be formed into a predetermined shape, but there is a problem that deformation such as warping or twisting tends to occur under the influence of molding shrinkage and the like.

  The present invention has been made in view of these points. The object is to provide a bead foam molded member in which deformation during molding is suppressed in a bead foam molded member which is a cushion member inserted on the opposite side to a seating surface of a resin foam molded body which is a cushion material of a vehicle seat. .

  A first invention of the present invention is a bead foam molding member for a vehicle sheet, which is integrated in a layer on the opposite side to the seating surface of a resin foam molding which is a cushioning material of a vehicle seat, When viewed from a direction substantially perpendicular to the seating surface, a frame-shaped reinforcing member is inserted and formed on the outer peripheral edge portion of the bead foam molding member, and is surrounded by the reinforcing member of the bead foam molding member In the region, at least one slit-like through hole penetrating in the thickness direction is provided.

  According to the first aspect of the invention, the tensile stress in the direction substantially parallel to the seating surface along with the molding shrinkage of the bead foam molding member is divided by the through hole and becomes smaller, thereby the direction substantially perpendicular to the seating surface of the resin foam molding Deformation such as warping or twisting is suppressed. This makes it possible to attach the surface on the opposite side to the seating surface of the bead foam molding member more closely to the cavity face of the upper mold when molding the resin foam molding. And it can suppress that defects, such as a missing, arise inside the resin foam-molded body.

  According to a second invention of the present invention, in the first invention, the reinforcing member is formed of a linear member made of metal, and at least one of the through holes is used to form the bead foam molded member against the seating surface. When viewed from a substantially vertical direction, the longitudinal direction is disposed to extend along the reinforcing member.

  According to the second aspect of the invention, since at least one of the through holes extends along the reinforcing member formed of the metal linear member and the longitudinal direction thereof is arranged, along with the molding shrinkage of the bead foam molded member The bending load applied to the reinforcing member is alleviated, and the reinforcing member is less likely to be deformed in a direction substantially perpendicular to the seating surface of the resin foam-molded body. Thereby, the deformation of the bead foam molded member, which is increased by the deformation of the reinforcing member, is suppressed.

  According to a third invention of the present invention, in the second invention, the through hole, the longitudinal direction of which extends along the reinforcing member, is a direction substantially perpendicular to the seating surface of the bead foam molding member When viewed from the above, the width of the bead foam molded member between the reinforcing member and the through hole is set to 1 to 5 times the length in the short direction of the through hole. .

  According to the third aspect of the present invention, since the through holes extend in the longitudinal direction so as to extend along the reinforcing member formed of the linear members and are disposed adjacent to each other, a line associated with the molding shrinkage of the bead foam molded body It is possible to efficiently absorb the bending deformation of the linear member and to suppress the deformation of the linear member. As a result, the deformation of the vehicle seat cushion member, which is increased by the deformation of the reinforcing member, is efficiently suppressed.

  According to a fourth aspect of the present invention, in the bead foam molded member according to any one of the first to third aspects, the center line in the sheet width direction when viewed from a direction substantially perpendicular to the seating surface. The through holes are formed symmetrically, and the through holes are arranged symmetrically with respect to a center line in the sheet width direction.

  According to the fourth aspect of the invention, the bead foam molded member is formed symmetrically with respect to the center line in the sheet width direction, and the through holes are arranged symmetrically with respect to the center line in the sheet width direction. It is possible to suppress the tensile stress associated with the molding shrinkage of the bead foam molded member in a well-balanced manner. As a result, deformation such as warping or twisting in a direction substantially perpendicular to the seating surface of the resin foam-molded article of the bead foam-molded member can be efficiently suppressed.

It is a perspective view of a cushion pad with which the bead foam molding member for vehicles sheets concerning a 1st embodiment of the present invention was integrated. It is an exploded perspective view of a cushion pad concerning the above-mentioned embodiment. It is a top view of the cushion pad concerning the above-mentioned embodiment. It is sectional drawing cut and shown by the IV-IV line of FIG. It is sectional drawing cut and shown by the VV line | wire of FIG. It is sectional drawing which shows the type | mold which shape | molds the cushion pad concerning the said embodiment. Fig. 5 shows a cross section corresponding to Fig. 4; The cavity is hollow. It is sectional drawing which shows the type | mold which shape | molds the cushion pad concerning the said embodiment. Fig. 5 shows a cross section corresponding to Fig. 4; The bead foam molding member is attached to the upper mold. It is a top view of the cushion pad with which the bead foam molding member for vehicles sheets concerning a 2nd embodiment of the present invention was unified. It is sectional drawing cut and shown by the IX-IX line of FIG. It is a top view of the cushion pad with which the bead foam molding member for vehicles sheets concerning a 3rd embodiment of the present invention was unified. It is sectional drawing cut | disconnected and shown by the XI-XI line of FIG. It is a top view of the cushion pad with which the bead foam molding member for vehicles sheets concerning a 4th embodiment of the present invention was unified. It is sectional drawing cut | disconnected and shown by the XIII-XIII line | wire of FIG.

  The bead foam molding member 20 according to the first embodiment of the present invention will be described according to FIGS. 1 to 5 together with the cushion pad 1 which is a cushioning material of an automobile seat formed by integrating the bead foam molding member 20. . In each figure, arrows indicate the directions of the automobile when the cushion pad 1 is attached to the floor of the automobile. In the following description, the description of the direction will be made based on this direction.

  As shown in FIG. 1, the cushion pad 1 is for a seat cushion of a 3-seat bench seat, and has a length in the left-right direction substantially the same as the width of the cabin. A cushion cover (not shown) covering the surface is put on the cushion pad 1 to form a seat cushion. A seat back (not shown) having the same configuration is assembled in a state where it is erected at the rear end of the seat cushion, and is mounted on the floor of the passenger compartment, whereby a rear seat is configured. Here, the cushion pad 1 corresponds to the “resin foam molded body” in the claims.

  As shown in FIGS. 1 to 5, the cushion pad 1 has a pair of left and right seat portions 1S, and a central seat portion 1C disposed between the left and right seat portions 1S. Further, the cushion pad 1 has a surface layer pad 10 disposed on the front side which is the seating surface side, and a bead foam molded member 20 disposed on the back side which is the lower side of the surface layer pad 10.

The surface layer pad 10 is formed of urethane foam obtained by foam molding of a polyurethane resin, and its density is set to, for example, about 0.045 ± 0.005 g / cm ³ . The surface layer pad 10 has a surface portion 11 having a shape and area occupying the entire seating surface side of the cushion pad 1, and a back surface portion 12 forming a part of the cushion pad 1 opposite to the seating surface. As shown in FIG. 4, the surface layer pad 10 is a portion for supporting the thighs of the seated occupants of the left and right seat portions 1S, but with the buttocks support portion 10a supporting the buttocks of the seated occupants of the left and right seat portions 1S. It is formed thicker than the thigh support portion 10b. This is for elastically supporting the buttocks support portion 10a having a high seating pressure more than the thigh support portion 10b having a low seating pressure to improve the sitting comfort. In the surface layer pad 10, as shown in FIG. 5, the thigh support portion 10d of the central seat portion 1C is formed slightly thicker than the thigh support portion 10b of the left and right seat portions 1S. Although not shown, the buttocks support 10c of the central seat 1C is thinner than the buttocks support 10a of the left and right seats 1S. On the surface portion 11 of the surface layer pad 10, as shown in FIG. 3, a pair of longitudinal grooves 11a extending in the front and rear direction on the left and right of the left and right seat portions 1S and a pair of longitudinal grooves 11a Two lateral grooves 11b are formed to connect at the part. The longitudinal grooves 11a and the lateral grooves 11b are formed in a substantially U shape whose cross section is open upward.

The bead foam molding member 20 is a bead foam molding of an olefin resin such as polypropylene or polyethylene, and the density thereof is about 0.03 g / cm ³ . The bead foam molded member 20 is formed to be smaller in density and higher in elastic modulus than the surface layer pad 10. The volume of the bead foam molding member 20 is about 1/3 of the entire volume of the cushion pad 1.

  As shown in FIG. 2, FIG. 4 and FIG. 5, the bead foam molding member 20 forms a front side 21 that abuts a part of the back surface 12 of the surface layer pad 10 and a back side that forms a part of the back side of the cushion pad 1. And 22. As shown in FIG. 4, in the bead foam molding member 20, the buttocks support portion 20a, which is a portion for supporting the buttocks of the seated occupants of the left and right seat portions 1S, supports the thighs of the seated occupants of the left and right seat portions 1S. It is thinner than the thigh support portion 20b. This is for securing a predetermined thickness of the cushion pad 1 corresponding to the thickness of the buttocks support portion 10a and the thigh support portion 10b of the surface layer pad 10. The bead foam molding member 20 is provided with a pair of left and right through holes 20c penetrating vertically in the left and right direction (width direction) outside of the rear portion of the left and right seat portions 1S. Further, the bead foam molding member 20 is provided with one central through hole 20d from the rear of the central seat 1C to the inner side in the lateral direction (width direction) of the rear of the left and right seats 1S. Thereby, when the surface layer pad 10 is integrally foam-formed with respect to the bead foam molding member 20, a part of the surface layer pad 10 intrudes into the left and right through holes 20c and the center through hole 20d of the bead foam molding member 20 to form and harden An exposed back surface 12 a which is a part of the back surface 12 of the surface layer pad 10 is formed. The exposed back surface 12 a forms the back side of the cushion pad 1 together with the back side 22 of the bead foam molded member 20. The front side portion 21 of the bead foam molding member 20 is bonded to the bonding back surface 12 b which is a portion other than the exposed back surface 12 a of the back surface 12 of the surface layer pad 10 at the time of integral foam molding of the surface pad 10.

  As shown in FIGS. 2 and 3 to 5, a frame 23 made of iron wire is inserted inside the front, rear, left, and right peripheral edge portions of the bead foam molding member 20. The frame 23 is for connecting the substantially U-shaped main frame 23a whose front is open in top view, the front frame 23b disposed between the opening sides of the main frame 23a, and the main frame 23a and the front frame 23b. And two plate-like connecting frames 23c. Furthermore, the frame 23 has one rear locking frame 24a for locking the cushion pad 1 to the vehicle floor and four front locking frames 24b. The opening side end of the main frame 23a and the left and right ends of the front frame 23b are connected by welding to a connecting frame 23c. The rear locking frame 24a is fixed by welding to the main frame 23a, and the front locking frame 24b is welded and fixed to the connecting frame 23c. At the time of bead foam molding of the bead foam molding member 20, the main frame 23a, the front frame 23b, and the connecting frame 23c formed in a frame shape are disposed at a predetermined position in the mold and integrated by integral foam molding. There is. The frame 23 not only functions as a skeleton, but also functions to be attracted and held by a magnet embedded in the upper cavity surface when the bead foam molding member 20 is attached to the upper cavity surface of the upper mold when molding the cushion pad 1 Also play. Here, the frame 23 corresponds to the “reinforcement member” in the claims.

  As shown in FIGS. 3 to 5, in the bead foam molding member 20, three slit-like through holes penetrating in the vertical direction and extending in the left-right direction and slit-like members extending in the front-rear direction penetrating in the vertical direction Three through holes are formed. The slit-like through holes extending in the left-right direction have one central lateral through hole 25 and a pair of left and right lateral through holes 26. The central horizontal through hole 25 is formed to have a rounded rectangular cross section in a horizontal plane in top view. Then, in a portion slightly away from the front end of the central through hole 20d in the longitudinal direction, from the left side portion of the right side left and right seat portions 1S to the right side portion of the left side left and right seat portions 1S through the central seat portion 1C It is formed to extend linearly. Further, the short axis is set to extend in the front-rear direction by about the same length as the groove width of the longitudinal groove 11a. That is, the ratio of the length of the major axis to the length of the minor axis is a slit shape that is extremely large. The left and right horizontal through holes 26 are provided symmetrically in left and right directions with respect to the left and right center line of the bead foam molding member 20 in top view, and the cross section cut by the horizontal surface is formed into a rounded rectangle. The long axis is located approximately on the extension of the front end of the central through hole 20d in the left-right direction, from the right end of the right seat 1S to the right end of the center seat 1C, and the left From the left end side of the seat portion 1S to the left end side of the central seat portion 1C, the seat portion 1S extends in a straight line in the left-right direction. Further, the short axis is set to extend in the front-rear direction by about the same length as the groove width of the longitudinal groove 11a. That is, the length of the minor axis of the left and right lateral through holes 26 is set to be equal to the length of the minor axis of the central lateral through hole 25, and the slit shape having a large ratio of the major axis length to the minor axis length It is done. As shown in FIG. 4, at the end of the left and right horizontal through holes 26 in the direction of the back side 22, an expanded portion 26 a in which the length in the short axis direction is approximately doubled is formed. The expanded portion 26a is, as described later, when the bead foam molding member 20 is held in contact with the back side portion 22 on the upper cavity surface 42a of the upper mold 42 in the process of forming the cushion pad 1, the upper cavity surface 42a It is formed to engage with the convex portion 42b provided on the Due to the engagement between the expanded portion 26a and the convex portion 42b, the urethane foam resin raw material M is between the back side portion 22 and the upper cavity surface 42a of the bead foam molded member 20 from the left and right lateral through holes 26 at the time of integral foam molding of the surface layer pad 10. Will not break into Although not shown, in the central horizontal through hole 25 as well as the lateral horizontal through hole 26, at the end in the direction of the back side 22, an expanded portion in which the length in the minor axis direction is approximately doubled is formed There is. The function of this expanding portion is the same as that of the expanding portion 26a. Here, the center lateral through hole 25 and the left and right lateral through holes 26 correspond to the “through holes” in the claims.

  As shown in FIGS. 3 to 5, the slit-like through holes extending in the front-rear direction have one central longitudinal through hole 27 and a pair of left and right longitudinal through holes 28. The central vertical through hole 27 is formed to have a rounded rectangular cross section in a horizontal plane in top view. And in a top view, the major axis is formed to extend linearly in the front-rear direction between the central horizontal through hole 25 and the front frame 23b on the left and right center line of the bead foam molded member 20. In addition, the short axis extends in the left-right direction by about the same length as the groove width of the vertical groove 11a. That is, the ratio of the length of the major axis to the length of the minor axis is in the form of a slit. The left and right vertical through holes 28 are provided symmetrically in left and right directions with respect to the left and right center line of the bead foam molding member 20 in top view, and the cross section cut by the horizontal surface is formed into a rounded rectangle. And in a top view, the major axis is formed extending linearly along the right side of the main frame 23a from the center in the front-rear direction of the bead foam molded member 20 to the vicinity of the rear end of the connecting frame 23c. . In addition, the short axis extends in the left-right direction by about the same length as the groove width of the vertical groove 11a. That is, the length of the minor axis of the left and right longitudinal through holes 28 is set to be equal to the length of the minor axis of the central lateral through hole 25, and the slit shape having a large ratio of the major axis length to the minor axis length It is done. The right end portion of the right and left longitudinal through holes 28 is spaced apart from the left end portion of the right side portion of the main frame 23a by about two to three times the length of the minor axis, and is disposed leftward. The left end of the left side 28 is spaced apart from the right end of the left side of the main frame 23a in the rightward direction by about two to three times the length of the short axis. As shown in FIG. 5, the end portions of the central vertical through holes 27 and the left and right vertical through holes 28 in the direction of the back side 22 respectively have an enlarged portion 27a and an enlarged portion in which the length in the minor axis direction is approximately doubled. An opening 28a is formed. The functions of the expanded portion 27 a and the expanded portion 28 a are also similar to those of the expanded portion 26 a of the left and right lateral through holes 26 described above. Here, the central vertical through holes 27 and the left and right vertical through holes 28 correspond to the “through holes” in the claims.

  The manufacturing method of the cushion pad 1 is demonstrated based on FIG.6 and FIG.7. In addition, the display of the direction in FIG.6 and FIG.7 shall be match | combined with the direction of the cushion pad 1. FIG. The bead foam molded member 20 is molded by bead foam molding of an olefin resin in a state in which the frame 23 is inserted in advance. In bead foam molding, prefoamed beads obtained by prefoaming the raw material beads, which are pellets of an olefin resin impregnated with a foaming agent, are placed in a mold cavity and steam heated to further expand the prefoamed beads. It is a molding method that is shaped along the mold cavity. Specifically, a first mold (not shown) having a cavity surface corresponding to the shape of the front side portion 21 of the bead foam molding member 20 and a cavity corresponding to the shape of the back side portion 22 of the bead foam molding member 20 Use a second mold (not shown) having a face. Then, when the second mold is closed with respect to the first mold, pre-foaming is performed by filling pre-foaming beads in a state in which the frame 23 is set in the cavity formed therebetween and performing steam heating. The beads are further expanded to form a shape along the cavity. The portion of the mold forming the center horizontal through hole 25, the left and right horizontal through holes 26, the center vertical through hole 27, and the left and right vertical through holes 28 is provided to stand from the cavity surface of the second mold. ing.

  Next, the cushion pad 1 is molded by integrally foaming the surface layer pad 10 with the bead foam molding member 20. As shown in FIG. 6, the urethane foam mold 40 for molding the cushion pad 1 is composed of a lower mold 41 and an upper mold 42 that can be opened and closed with respect to the lower mold 41. Both the lower mold 41 and the upper mold 42 have a mold temperature control function for molding a urethane foam resin, and a lock mechanism (not shown) when the mold is closed. In the lower mold 41, a lower cavity surface 41a having a shape corresponding to the surface portion 11 of the surface layer pad 10 which is the surface side shape of the cushion pad 1 is formed. An upper cavity surface 42 a having a shape corresponding to the back side portion 22 of the bead foam molded member 20 which is the back surface side shape of the cushion pad 1 and the exposed back surface portion 12 a of the surface layer pad 10 is formed in the upper mold 42. With the upper mold 42 closed with respect to the lower mold 41, a cavity 43 surrounded by the lower cavity surface 41a and the upper cavity surface 42a is formed between the lower mold 41 and the upper mold 42. As shown in FIG. 7, the back side portion 22 of the bead foam molded member 20 is held in contact with the upper cavity surface 42 a of the upper die 42. A plurality of permanent magnets (not shown) are embedded at predetermined positions of the upper cavity surface 42a to attract and hold the frame 23 inserted into the bead foam molding member 20 by magnetic force. The bead foam molded member 20 is held on the upper cavity surface 42 a by the magnetic force and the concavo-convex fitting between the back side 22 and the upper cavity surface 42 a. The state shown in FIG. 7 is a state in which the upper die 42 to which the bead foam molding member 20 is attached is closed with respect to the lower die 41. At this time, since deformation in a direction substantially perpendicular to the seating surface of the cushion pad 1 is suppressed, the bead foam molding member 20 can be attached with the back side portion 22 in close contact with the upper cavity surface 42a. . In this state, as shown in FIG. 7, before the upper mold 42 is closed to the lower mold 41, the urethane foam resin raw material M is put on the lower cavity surface 41a of the lower mold 41 to close the mold. Then, the surface of the surface layer pad 10 is formed after a predetermined time for foaming and curing has elapsed since the foamed urethane resin raw material M is foamed to fill the cavity 43 while increasing the volume. Thus, the surface layer pad 10 is formed and integrated with the bead foam molded member 20 to manufacture the cushion pad 1. Thereafter, the upper mold 42 is opened with respect to the lower mold 41 and the cushion pad 1 thus molded is demolded.

  The first embodiment configured as described above has the following effects. The tensile stress in the direction substantially parallel to the seating surface along with the molding shrinkage of the bead foam molded member 20 is divided by the central lateral through hole 25, the lateral right through hole 26, the central longitudinal through hole 27 and the lateral vertical through hole 28 and is small Become. Thereby, deformation such as warping or twisting in a direction substantially perpendicular to the seating surface of the cushion pad 1 is suppressed. Then, the back side portion 22 of the bead foam molding member 20 can be attached more closely to the upper cavity surface 42 a at the time of molding the cushion pad 1, and the inside of the surface layer pad 10 of the cushion pad 1 etc. Can be suppressed. In addition, since the longitudinal direction of the left and right longitudinal through holes 28 is extended along the frame 23, the bending load applied to the frame 23 is relaxed with the molding shrinkage of the bead foam molding member 20, and the frame 23 It becomes difficult to deform in a direction substantially perpendicular to the seating surface of the cushion pad 1. Thereby, the deformation of the bead foam molded member 20, which is increased by the deformation of the frame 23, is suppressed. Furthermore, since the longitudinal direction of the left and right through holes 28 extends along the frame 23 and is disposed adjacent to each other, bending deformation of the frame 23 accompanying molding shrinkage of the bead foam molding member 20 can be efficiently absorbed. 23 deformations can be suppressed. In addition, the bead foam molding member 20 is formed in left-right symmetry with respect to the center line in the sheet width direction, and the central horizontal through hole 25, left and right horizontal through holes 26, central vertical through hole 27 and left and right vertical through holes 28 are sheets. It is disposed to be symmetrical with respect to the center line in the width direction. As a result, it is possible to control the tensile stress associated with the molding shrinkage of the bead foam molding member 20 in a well-balanced manner, and efficiently deform deformation such as warping or twisting in a direction substantially perpendicular to the seating surface of the cushion foam pad 1 of the bead foam molding member 20 It can be suppressed.

  FIGS. 8 and 9 show a cushion pad 1A as a cushioning material of an automobile seat formed by integrating the bead foam molding member 20A according to the second embodiment of the present invention. The same reference numerals are given to the structures common to the first embodiment and the detailed description will be omitted. The difference from the first embodiment is that the main frame 23a of the frame 23 is formed by a combination of one rear frame 23a1 and a pair of left and right frames 23a2 to form a frame 23A, and a pair of left and right longitudinal through holes 28 It is a point which serves as a pair of left and right vertical through holes 28A at different positions. The frame 23A is between the front end portion of the rear frame 23a1 and the connecting frame 23c, and the rear frame 23a1 made of a substantially U-shaped iron wire in which the main frame 23a of the frame 23 opens forward in the rear side portion It is replaced with a combination frame with a pair of left and right frames 23a2 made of iron wires opened in the sheet inward direction to be connected. The pair of left and right frames 23a2 is disposed at a position projecting outward in the seat width direction from the longitudinal groove 11a on the seat width direction outer side of the cushion pad 1A in top view. The pair of left and right vertical through holes 28A are disposed such that the major axis extends in the front-rear direction on the inner side in the seat width direction than the longitudinal groove 11a outside the seat width direction of the cushion pad 1A in top view. The shape in a top view of the pair of left and right longitudinal through holes 28A is substantially the same as the pair of left and right longitudinal through holes 28, but the longitudinal direction along the frame 23 is not extended and arranged in proximity. In the same manner as the central vertical through hole 27, an expanded portion 28Aa is formed at the end of the pair of left and right vertical through holes 28A in the direction of the back side 22 respectively. Here, the cushion pad 1A and the frame 23A correspond to the "resin foam molded body" and the "reinforcement member" in the claims respectively. Also, the left and right vertical through holes 28A correspond to the "through holes" in the claims.

  In the bead foam molded member 20A according to the second embodiment of the present invention, as compared with the first embodiment, the longitudinal direction of the left and right longitudinal through holes 28A is not extended along the frame 23, and thus the bead foam molded member The bending load applied to the frame 23 is relieved with the molding shrinkage of 20, and the effect that the frame 23 is hardly deformed in the direction substantially perpendicular to the seating surface of the cushion pad 1 is not exerted. Other effects and effects are the same as those of the first embodiment.

  FIGS. 10 and 11 show a cushion pad 1B which is a cushioning material of an automobile seat formed by integrating the bead foam molding member 20B according to the third embodiment of the present invention. The same reference numerals are given to the structures common to the first embodiment and the detailed description will be omitted. The difference from the first embodiment is that the configuration of the frame 23 is different and the frame 23B is used, and the through hole and the through hole are different in position and shape. In the frame 23B, a main frame 23a3 made of a substantially U-shaped iron wire whose front is open in top view, and a front frame 23b1 made of a substantially U-shaped iron pipe whose rear is open in top It is a frame connected by parts and formed in a frame shape. A pair of left and right front locking frames 24b1 is attached to the front frame 23b1. The through holes and the through holes are arranged symmetrically with respect to the left and right center line of the bead foam molding member 20B in top view, so the through holes on the right and the through holes will be described as a representative, and the through holes and the through holes on the left side The description of the holes is omitted. The left and right rear through holes 20f near the right rear corner of the bead foam molding member 20B, the left and right middle through holes 20g at the center of the left and right seat 1S, and the central rear through hole at the rear of the central seat 1C A central central through hole 20i is provided at the center of the central seat portion 1C in the front-rear direction. The first left and right vertical through holes 28B1 are disposed along the left side of the coupling portion of the right main frame 23a3 and the front frame 23b1. The width of the bead foam molding member between the main frame 23a3 and the front frame 23b1 and the first left and right vertical through holes 28B1 is set to be substantially the same as the groove width of the vertical groove 11a. The second left and right vertical through holes 28B2 extend in the front-rear direction between the left rear end of the left and right middle through holes 20g and the main frame 23a3. The third left and right vertical through holes 28B3 are disposed in the left front end portion of the left and right middle through holes 20g so as to communicate with the left and right middle through holes 20g and extend forward. The first central longitudinal through hole 27B1 extends in the front-rear direction between the vicinity of the right rear end of the central through hole 20i and the central rear through hole 20h. The second central vertical through hole 27B2 is disposed to extend forward in communication with the central through hole 20i at the right front corner portion of the central through hole 20i. The first left and right longitudinal through holes 28B1 are formed in a rounded rectangle with a cross section taken along a horizontal plane in a top view bent and the length of the minor axis thereof is set to the same extent as the groove width of the longitudinal groove 11a . The second left and right longitudinal through holes 28B2, the third left and right longitudinal through holes 28B3, the first central longitudinal through hole 27B1, and the second central longitudinal through hole 27B2 are also formed in a rectangular rectangle in cross section cut in a horizontal plane in top view The length of the short axis is set to the same extent as the groove width of the longitudinal groove 11a. In the end of the back side 22 of the first left and right longitudinal through hole 28B1, the second left and right longitudinal through hole 28B2, the third left and right longitudinal through hole 28B3, the first central longitudinal through hole 27B1 and the second central longitudinal through hole 27B2, In each case, the flared portion is formed as in the first embodiment. Here, the cushion pad 1B and the frame 23B respectively correspond to the “resin foam molded body” and the “reinforcement member” in the claims. The first left and right vertical through holes 28B1, the second left and right vertical through holes 28B2, the third left and right vertical through holes 28B3, the first central vertical through hole 27B1 and the second central vertical through hole 27B2 are described in the claims. Corresponds to "hole".

  The bead foam molded member 20B according to the third embodiment of the present invention exhibits the same effects as those of the first embodiment. The first left and right longitudinal through holes 28B1 extend along the frame 23B so that the bending load applied to the frame 23B is alleviated as the bead foam molding member 20 shrinks due to molding shrinkage of the bead foam molding member 20. It becomes difficult to deform in a direction substantially perpendicular to the seating surface of the cushion pad 1.

  FIGS. 12 and 13 show a cushion pad 1D which is a cushioning material of an automobile seat formed by integrating a bead foam molding member 20D according to a fourth embodiment of the present invention. The same reference numerals are given to the structures common to the first embodiment and the detailed description will be omitted. The difference from the first embodiment is that the through holes and the through holes have different positions and shapes. The through holes and the through holes are arranged symmetrically with respect to the left and right center line of the bead foam molding member 20D in a top view, so the through holes on the right and the through holes will be described as a representative and the through holes and the through holes on the left The description of the holes is omitted. A central middle rear through hole 20k is provided from the center to the rear in the front-rear direction of the central seat 1C, from the center to the rear in the front-rear direction from the central to the rear in the front-rear direction of the left and right seat 1S of the bead foam molding member 20D There is. The position and shape of the left and right through holes 28D are substantially the same, except that the length in the major axis direction is slightly shorter than that of the left and right through holes 28 in the first embodiment. The position and the shape of the central vertical through holes 27D are substantially the same except that the length in the major axis direction is slightly shorter than that of the central vertical through holes 27 in the first embodiment. The first left and right lateral through holes 26D1 are disposed extending in the left and right direction at a portion slightly forward from the front end of the left, right, middle and rear through holes 20j. The second left and right horizontal through holes 26D2 extend in the left and right direction so as to intersect the longitudinal groove 11a on the inner side in the sheet width direction at the same position as the first left and right horizontal through holes 26D1. The first left and right horizontal through holes 26D1 and the second left and right horizontal through holes 26D2 are formed in a rectangular cross section in a horizontal plane in top view, and the length of the short axis is the same as the groove width of the longitudinal groove 11a. The degree is set. The lengths in the major axis direction of the first left and right horizontal through holes 26D1 and the second left and right horizontal through holes 26D2 are approximately equal to one third of the distance between the vertical grooves 11a. The end portions in the direction of the back side portion 22 of the left and right vertical through holes 28D, the central vertical through holes 27D, the first left and right horizontal through holes 26D1, and the second left and right horizontal through holes 26D2 are expanded similarly to the first embodiment. An opening is formed. Here, cushion pad 1D corresponds to the "resin foam molding" of a claim. The left and right vertical through holes 28D, the central vertical through hole 27D, the first left and right horizontal through holes 26D1, and the second left and right horizontal through holes 26D2 correspond to the "through holes" in the claims.

  The bead foam molded member 20D according to the fourth embodiment of the present invention exhibits the same function and effect as those of the first embodiment. Since the longitudinal direction of the left and right longitudinal through holes 28D is arranged to extend along the frame 23D, the bending load applied to the frame 23D is relaxed with the molding shrinkage of the bead foam molding member 20D, and the frame 23D is a cushion pad It becomes difficult to deform in a direction substantially perpendicular to the seating surface of 1.

  Although the specific embodiments have been described above, the present invention is not limited to these configurations, and various changes, additions, and deletions can be made without departing from the scope of the present invention. For example, the following may be mentioned.

  1. In the above embodiment, although the bead foam molded members of olefin resin such as polypropylene and polyethylene are used as the bead foam molded members 20, 20A, 20B and 20D, the present invention is not limited to this, and styrene resin or styrene resin and olefin A bead foam of a composite resin with a base resin can also be used.

  2. In the said embodiment, although this invention was applied to the seat cushion for motor vehicles, you may apply to the seat back for motor vehicles, and may apply to the seat mounted in an airplane, a ship, a train etc.

1,1A, 1B, 1D Cushion Pad (Resin foam molded product)
10 surface pad 11 surface portion (seating surface)
12 back surface portion 20, 20A, 20B, 20D bead foam molded member 21 front side portion 22 back side portion 23, 23A, 23B, 23D frame (reinforcement member)
25 central horizontal through hole (through hole)
26 Left and right side through holes (through holes)
26D1 1st left and right side through hole (through hole)
26D2 2nd left and right side through holes (through holes)
27 central vertical through hole (through hole)
27B1 1st central longitudinal through hole (through hole)
27B2 Second central vertical through hole (through hole)
27D central vertical through hole (through hole)
28 Left and right vertical through holes (through holes)
28A left and right vertical through holes (through holes)
28B1 First left and right vertical through holes (through holes)
28B2 Second left and right vertical through holes (through holes)
28B3 3rd left and right vertical through holes (through holes)
28D left and right vertical through holes (through holes)
40 Urethane foam molding die 41 lower mold 41 a lower cavity surface 42 upper mold 42 a upper cavity surface 43 cavity M foam urethane resin raw material

Claims (4)

A bead foam molding member for a vehicle seat which is integrated in a layer on the side opposite to the seating surface of the resin foam which is a cushioning material of the vehicle seat,
When the bead foam molded member is viewed from a direction substantially perpendicular to the seating surface, a frame-shaped reinforcing member is inserted and formed on the outer peripheral edge portion of the bead foam molded member,
A bead foam molding member for a vehicle seat, wherein at least one slit-like through hole penetrating in the thickness direction is provided in a region surrounded by the reinforcing member of the bead foam molding member. In Claim 1, the reinforcing member is formed of a metal linear member,
A vehicle seat bead wherein at least one of the through holes is disposed such that its longitudinal direction extends along the reinforcing member when the bead foam molded member is viewed from a direction substantially perpendicular to the seating surface. Foam molded part.   In Claim 2, the through hole, the longitudinal direction of which extends along the reinforcing member, is arranged with the reinforcing member when the bead foam molded member is viewed from a direction substantially perpendicular to the seating surface. A bead foam molding member for a vehicle seat, wherein the width of the bead foam molding member between the through hole and the through hole is set to 1 to 5 times the length in the short direction of the through hole. The bead foam molded member according to any one of claims 1 to 3, formed in left-right symmetry with respect to a center line in the sheet width direction, when viewed from a direction substantially perpendicular to the seating surface. A bead foam molded member for a vehicle seat, wherein the through holes are arranged to be symmetrical with respect to the center line in the sheet width direction.

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