JP5786682B2 - Rib structure of molded structure - Google Patents

Description

  The present invention relates to a rib structure of a molded structure in which ribs are integrally formed on the surface thereof by resin injection molding in order to reinforce the molded structure.

  A resin backboard may be provided on the back of the vehicle seat. Reinforcing ribs are generally provided on the back surface of the backboard (see Patent Document 1 below).

Japanese Utility Model Publication No. 5-76354

The backboard of Patent Document 1 is integrally molded by resin injection molding. However, if the molding conditions are not maintained well, the resin may not be sufficiently distributed to the part far from the resin injection port, resulting in lack of thickness. is there. For example, if a thin wall is generated at the center of the rib, there is a problem that the rib reinforcing function is not sufficiently performed.
In view of such a problem, the present invention has a rib reinforcing function even if a shortage occurs by positioning a part where a thinning may occur on a part of the rib structure that does not affect the reinforcing function. The issue is to prevent damage.

A first aspect of the present invention is a rib structure of a molded structure in which a rib is integrally formed on the surface by resin injection molding for reinforcement of the molded structure. The injection ports are arranged at both ends of the rib, the ribs are divided into two between the two ends, and the center side ends of the divided ribs overlap each other in a direction intersecting the reinforcing direction by the ribs. It is characterized by being arranged in.
According to the first invention, the portion far from the injection port of the rib becomes the center side end portion of the divided ribs on both sides, and the center side end portions of the divided ribs on both sides intersect the reinforcing direction by the ribs. Since they are arranged so as to overlap each other in the direction, even if there is a lack of thickness at the time of injection molding at the part far from the injection port, that is, at the center side end of the divided ribs, the position serves as a rib reinforcing function. The position will not be affected. This is because the ribs have a reinforcing function in the same manner as the ribs are integrated at the center side ends of the ribs on both sides arranged in a direction crossing the reinforcing direction by the ribs. Therefore, the rib can perform a reinforcing function even if a thin portion is generated in a portion far from the injection port during injection molding.

According to a second aspect of the present invention, in the first aspect of the present invention, the divided ribs on both sides are formed with bases at positions on both sides from positions overlapping each other in one direction that intersects the reinforcing direction by the ribs. Are bent in the one direction in which the central ends of the first bent portions approach each other to form a first bent portion, and in the direction in which the ends of the first bent portions approach each other and in the other direction, which is the reinforcing direction by the ribs. A second bent portion is formed by bending, and the second bent portions are overlapped with each other in the one direction, and at least one of the second bent portions is opposed to the other base portion, and both are in the other direction. It is characterized by being arranged on a straight line.
According to the second aspect of the present invention, the portions that overlap each other in one direction of the ribs on both sides are formed by the portions bent by the first and second bent portions, so that the ribs that are divided from each other are also integrated. The reinforcing function can be achieved. In addition, since at least one of the second bent portions faces the other base portion and both are arranged on a straight line in the other direction, the reinforcing function can be further enhanced.

It is a disassembled perspective view of the backboard of the vehicle seat which is one Embodiment of this invention. It is an enlarged front view of the said embodiment. It is an enlarged side view of the said embodiment. It is explanatory drawing which shows the modification of the said embodiment.

An embodiment of the present invention will be described with reference to FIGS.
The molding structure in this case is the backboard 1 fixed to the back surface of the seat back of the vehicle seat, and the backboard body 11 is a molding structure containing kenaf fibers.
The backboard body 11 is formed by pressing a mat-like preboard (not shown) formed by impregnating polypropylene, which is a thermoplastic resin, into kenaf fibers so as to conform to the back surface of the seatback. Yes. Here, polypropylene plays a role as a binder for connecting kenaf fibers.

Reinforcing ribs 2 are integrally formed on the back surface, which is a mounting surface of the backboard body 11 to a seat back (not shown). In the rib 2, a large number of side ribs 21 are formed in the vertical direction along the curved portions on both sides of the backboard body 11, and two center ribs 22 are laterally connected so as to connect both sides of the backboard body 11. , 23 are formed. Here, the vertical direction corresponds to one direction that intersects the reinforcing direction by the central ribs 22 and 23, and the horizontal direction corresponds to the other direction that is the reinforcing direction by the central ribs 22 and 23.
These ribs 2 are formed on the back surface of the backboard body 11 by injecting polypropylene in the above-described compression molding state into an injection mold formed on the surface of a mold used when the preboard is compression-molded on the backboard body 11. Molded integrally. At this time, the resin used for injection molding is polypropylene, and the binder resin at the time of molding the backboard body 11 is also polypropylene, so that the ribs 2 can be formed on the back surface of the backboard body 11 without any special adhesion treatment. It is integrally formed. In addition, the polypropylene used as resin for injection molding or a binder is an example, and it is good also as a mixture with other thermoplastic resins or thermoplastic resins other than polypropylene, such as polyethylene terephthalate.
In this case, an injection molding injection port (not shown) is divided into both sides of the backboard body 11 and arranged in an appropriate number.

Thus, when the rib 2 is formed, the locking pieces 12 and 12 and the fixing pieces 13 and 13 are simultaneously formed on the upper side and the lower side of the backboard body 11. These are also formed by injection molding of polypropylene in the same manner as the ribs 2.
Since the locking pieces 12 and 12 and the fixing pieces 13 and 13 are integrally formed on the upper and lower portions of the backboard main body 11, the backboard main body 11 can be attached to the back of the seat back. That is, the locking pieces 12 and 12 are locked to a locking portion (not shown) provided on the back of the seat back, and then the fixing pieces 13 and 13 are attached to the mounting portion (not shown) of the back of the seat back. It is attached by abutting and screwing.

The center ribs 22 and 23 are integrated with the side ribs 21 at both sides of the backboard body 11, and are separated into left and right parts at the center.
The central rib 22 has base portions 221 and 222 on both sides thereof extending in the lateral direction, and the base portion 221 is bent upward at the center side end portion to form a first bent portion 223, and the base portion 222 is below The first bent portion 224 is formed by being bent in the direction. That is, the center side end portions of the base portions 221 and 222 are bent in a direction approaching each other. Further, the end portions of the first bent portions 223 and 224 are both bent again in the lateral direction toward the center side to form second bent portions 225 and 226. That is, the end portions of the first bent portions 223 and 224 are bent in directions approaching each other. Therefore, the second bent portions 225 and 226 are overlapped with each other in the vertical direction. In addition, one second bent portion 225 faces the other base portion 222, and both are arranged on a straight line in the horizontal direction. Here, the first bent portion 224 is formed shorter than the first bent portion 223, and the second bent portion 226 is disposed so as to face the first bent portion 223.
Further, the base rib 231 has base portions 231 and 232 extending laterally on both sides thereof, and the base portion 231 is bent downward at the center side end portion to form a first bent portion 233. Are bent upward to form a first bent portion 234. That is, the center side end portions of the base portions 231 and 232 are bent in a direction approaching each other. Further, the end portions of the first bent portions 233 and 234 are both bent again in the lateral direction toward the center side to form second bent portions 235 and 236. That is, the end portions of the first bent portions 233 and 234 are bent in directions approaching each other. For this reason, the second bent portions 235 and 236 overlap each other in the vertical direction. Moreover, one second bent portion 235 faces the other base portion 232, and both are arranged on a straight line in the horizontal direction. Here, the first bent portion 234 is formed longer than the first bent portion 233, and the second bent portion 236 is arranged to face the first bent portion 233 at a slightly higher position.

In the above embodiment, the second bent portions 225 and 226, 235 and 236 of the central ribs 22 and 23 are arranged so as to overlap each other in the vertical direction. Even if a lack of thickness at the time of injection molding occurs at each end of the two bent portions 225, 226, 235, 236, the position does not affect the reinforcing function of the central ribs 22, 23. This is because the ribs have a reinforcing function in the same manner as the ribs are integrated by the second bent portions 225, 226, 235, and 236 arranged to overlap each other in the vertical direction. Therefore, even if a thin portion occurs in a portion far from the injection port during injection molding, the central ribs 22 and 23 can perform a reinforcing function.
The central ribs 22 and 23 are divided in the lateral direction at the central portion, and the divided portions are the first bent portions 223, 224, 233 and 234 and the second bent portions 225, 226, 235 and 236. Since the base portions 221 and 222 and the base portions 231 and 232 are arranged close to each other by the bent portions, the divided central ribs 22 and 23 can perform a reinforcing function in the same manner as if they were integrated. it can.
In addition, since one of the second bent portions 225 and 235 faces the other base portions 222 and 232 and both are arranged on a straight line in the lateral direction, the reinforcing function can be further enhanced.

FIG. 4 shows a modification of the shape of the central ribs 22 and 23 in the above-described embodiment. The modifications shown in FIGS. 4A to 4J correspond to a portion surrounded by a dot-and-dash circle in FIG. However, in FIGS. 4A to 4J, only the central rib 22 of the central ribs 22 and 23 is shown.
FIG. 4A shows that the base portions 221A and 222A on both sides extend linearly in the lateral direction, and the vertical position of both base portions 221A and 222A is set higher than the base portion 221A than the 222A. Are formed so as to overlap in the vertical direction. In this case, the injection port of the resin at the time of injection molding is on both sides. Here, the vertical direction corresponds to one direction that intersects the reinforcing direction by the ribs, and the horizontal direction corresponds to the other direction that is the reinforcing direction by the ribs.

  In FIG. 4B, the base portions 221B and 222B on both sides extend in the horizontal direction at the same vertical position, and the central side end portion of the base portion 222B is bent downward to form the first bent portion 224B. The end of the bent portion 224B is bent leftward to form a second bent portion 226B. The second bent portion 226B is formed so as to overlap the center side end portion of the base portion 221B in the vertical direction. In this case, the injection port of the resin at the time of injection molding is on both sides. Here, the vertical direction corresponds to one direction that intersects the reinforcing direction by the ribs, and the horizontal direction corresponds to the other direction that is the reinforcing direction by the ribs.

  FIG. 4C shows that the base portions 221C and 222C on both the upper and lower sides extend vertically in a straight line, and the lateral position of both base portions 221C and 222C is set to the left side of the base portion 221C so that the center side end The parts are formed so as to overlap in the lateral direction. In this case, the resin injection ports at the time of injection molding are on both the upper and lower sides. Here, the horizontal direction corresponds to one direction that intersects the reinforcing direction by the ribs, and the vertical direction corresponds to the other direction that is the reinforcing direction by the ribs.

  In FIG. 4D, the base portions 221D and 222D on both the upper and lower sides extend in the vertical direction at the same lateral position, and the center side end portion of the base portion 221D is bent in the right direction to form the first bent portion 223D. A right end portion of the bent portion 223D is bent downward to form a second bent portion 225D. The second bent portion 225D is formed so as to overlap the central side end portion of the base portion 222D in the lateral direction. In this case, the resin injection ports at the time of injection molding are on both the upper and lower sides. Here, the horizontal direction corresponds to one direction that intersects the reinforcing direction by the ribs, and the vertical direction corresponds to the other direction that is the reinforcing direction by the ribs.

  In FIG. 4E, the base portions 221E and 222E on the upper and lower sides extend in the vertical direction, and the center side end portions of the upper base portion 221E and the lower base portion 222E are bent in the right direction and the left direction, respectively. Bent portions 223E and 224E are formed, and end portions of the first bent portions 223E and 224E are bent downward and upward, respectively, thereby forming second bent portions 225E and 226E. The second bent portions 225E and 226E are formed so as to overlap each other in the lateral direction. In this case, the resin injection ports at the time of injection molding are on both the upper and lower sides. Here, the horizontal direction corresponds to one direction that intersects the reinforcing direction by the ribs, and the vertical direction corresponds to the other direction that is the reinforcing direction by the ribs.

  FIG. 4 (F) shows that bases 221F and 222F on both sides extend obliquely from both sides to the center so as to increase the vertical position, and the center side ends of both bases 221F and 222F are vertical. They are formed to overlap each other in the direction. In this case, the injection port of the resin at the time of injection molding is on both sides. Here, the vertical direction corresponds to one direction that intersects the reinforcing direction by the ribs, and the horizontal direction orthogonal to the vertical direction corresponds to the other direction that is the reinforcing direction by the ribs.

  In FIG. 4G, the bases 221G and 222G on both sides extend from both sides toward the center, and the left base 221G extends obliquely so as to increase the vertical position from both sides toward the center. The right base portion 222G extends in the lateral direction so as not to change the vertical position between the right side portion and the central portion, and the center side end portions of the base portions 221G and 222G are formed to overlap each other in the vertical direction. In this case, the injection port of the resin at the time of injection molding is on both sides. Here, the vertical direction corresponds to one direction that intersects the reinforcing direction by the ribs, and the horizontal direction corresponds to the other direction that is the reinforcing direction by the ribs.

  FIG. 4H shows that the base portions 221H and 222H on both sides extend in the lateral direction to a position where the center side end portions overlap each other in the vertical direction, and the center side end portions of the upper base portion 221H and the lower base portion 222H. Are bent downward and upward to form first bent portions 223H and 224H, respectively, and ends of the first bent portions 223H and 224H are bent to the left and right sides, respectively, and second bent portions 225H and 226H, respectively. Is formed. The center side end portions of the base portions 221H and 222H and the first bent portions 223H and 224H sides of the second bent portions 225H and 226H are formed so as to overlap each other in the vertical direction. In this case, the injection port of the resin at the time of injection molding is on both sides. Here, the vertical direction corresponds to one direction that intersects the reinforcing direction by the ribs, and the horizontal direction corresponds to the other direction that is the reinforcing direction by the ribs.

  FIG. 4 (J) shows that the base portions 221J and 222J on both sides extend in the lateral direction to the position where the center side end portions overlap each other in the vertical direction, and the center side end portion of the upper base portion 221J is bent downward. Thus, a first bent portion 223J is formed, and an end portion of the first bent portion 223J is bent leftward to form a second bent portion 225J. The center side end portions of the base portions 221J and 222J and the first bent portion 223J side portion of the second bent portion 225J are formed to overlap each other in the vertical direction. In this case, the injection port of the resin at the time of injection molding is on both sides. Here, the vertical direction corresponds to one direction that intersects the reinforcing direction by the ribs, and the horizontal direction corresponds to the other direction that is the reinforcing direction by the ribs.

  In each of the modifications shown in FIGS. 4A to 4J, as in the above-described embodiment, the portion far from the rib injection port becomes the center side end portion of the divided ribs on both sides and is divided. Since the center side ends of the ribs on both sides are overlapped with each other in the direction intersecting the reinforcing direction of the ribs including the second bent portion, the part far from the injection port, that is, the divided ribs on both sides Even if a lack of thickness occurs at the center end of the injection molding, the position does not affect the reinforcing function of the rib. This is because the ribs perform a reinforcing function in the same manner as the ribs are integrated in the vicinity of the central side end portions of the ribs on both sides arranged in a direction crossing the reinforcing direction by the ribs. Therefore, the rib can perform a reinforcing function even if a thin portion is generated in a portion far from the injection port during injection molding.

The present invention is not limited to the appearance and configuration described in the above embodiment, and various modifications, additions, and deletions can be made without changing the gist of the present invention. For example,
1. In addition to the backboard described as the embodiment, various types of molded structures are included. For example, a vehicle door trim may be used.
2. The molded structure may be molded by resin injection molding. In that case, the molded structure and the rib may be simultaneously injection molded.

1 Backboard 11 Backboard body (molded structure)
2 Ribs 21 Side ribs 22, 23 Central ribs 221, 222, 231, 232 Bases 223, 224, 233, 234 First bent portions 225, 226, 235, 236 Second bent portions

Claims (1)

A rib structure of a molded structure in which ribs are integrally formed on the surface by resin injection molding for reinforcement of the molded structure,
The injection port of the resin at the time of the injection molding of the rib is arranged at both ends of the rib, the rib is divided into two between the both ends, and the central side ends of the divided ribs are reinforced by the rib. Arranged to overlap each other in the direction intersecting the direction ,
The divided ribs on both sides
Bases are formed at both side positions from positions overlapping each other in one direction that intersects the reinforcing direction by the ribs,
The first bent portion is formed by bending in the one direction in which the center side end portions of the respective base portions approach each other,
The second bent portion is formed by bending again in the direction in which the ends of the first bent portions approach each other and in the other direction, which is the reinforcing direction by the ribs,
The second bent portions are overlapped with each other in the one direction,
And the rib structure of the forming structure characterized in that at least one of the second bent portions is opposed to the other base portion and both are arranged on a straight line in the other direction .

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