JP2006335451A - Resin case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin case having a lid capable of being easily fitted to a casing which is greatly warped. <P>SOLUTION: The resin case 1 has the box-like casing 10 with a rectangular opening 13, and the lid 20 fitted to the opening 13 of the casing 10. In the resin case 1, the rid 20 includes a covering portion 21 covering the opening 13 of the casing 10, and a plate-like downward extending portion 22 extending downward from the vicinity of the edge of the lower face of the covering portion 20 fitted to the opening 13 of the casing 10. The downward extending portion 22 has a warp correcting portion 23 formed by notching the lower edge of the downward extending portion into a shape of a recess. The warp correcting portion 22 includes oblique lines 23a extending from both sides 22a of the downward extending portion 22 toward its center. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin case formed by injection molding, and particularly to a resin case in which a lid can be easily attached to a casing.

  Conventionally, a thermoplastic resin material is used for a case for housing an electronic device such as a communication device of a remote controller or a tire pressure monitoring system from the viewpoint of productivity, weight reduction, and flexibility in shape due to improved functionality. . For example, as shown in FIG. 4, such a resin case includes a casing 31 having a rectangular opening 33 and a lid 32 attached to the opening 33 of the casing 31. The lid body 32 has a structure in which a hanging portion 35 is provided in the vicinity of the lower surface edge of the covering portion 34 that covers the opening portion 33 of the casing 31, and the covering portion 34 is covered on the casing 31 by inserting the hanging portion 35 into the opening portion 33. State.

  Generally, as a method of manufacturing a molded product made of a thermoplastic resin, there is an injection molding method in which a mold provided with a cavity is used, and a molten resin is injected into the mold cavity, filled, cooled, and solidified. It is used. FIG. 5 shows a cross-sectional view of a mold for forming the casing.

  As shown in FIG. 5, the mold 40 is composed of a fixed side mold plate 42 and a movable side mold plate 43, and a resin melted at a high temperature from a gate 44 into a cavity 41 formed by these both mold plates. Injection injection is performed. After cooling for a certain time, the movable side mold plate 43 is pulled away from the fixed side mold plate 42 together with the molded product, and the molded product is taken out by being released from the movable side mold plate 43 by a protruding device (not shown).

  By the way, in such a box-shaped casing, the surface area serving as a heat radiating surface is wider on the outer side than on the inner side, and therefore the inner side shrinks greatly due to delay in solidification, or the fiber direction when filled with glass fiber or the like The side wall is deformed so as to fall inward because it tends to shrink in the thickness direction that is perpendicular to the side wall, but is difficult to shrink in the portion connected to the side wall at the end. At this time, when the side wall is close to the orthogonal surface, the side wall is supported and deformation is reduced. Therefore, as shown in FIG. The central portion of the side wall that is not connected to 32 is greatly deformed. On the other hand, the lid 32 is shallow and the amount of deformation is small, so that the drooping portion 35 cannot be inserted into the opening 33 in some cases.

As a method for solving this, it is conceivable to reinforce with a crosspiece or the like, or to provide a meat theft as in Patent Document 1 to suppress the warping amount. However, in the former case, the mold formation becomes complicated. In addition, there is a problem that the space for housing the electronic device is reduced. In the latter case, there is a problem that the formation of the mold is complicated and it is difficult to obtain sufficient strength.
Japanese Patent No. 3197189

  The present invention has been made in view of the above problems, and an object thereof is to provide a resin case in which a lid can be easily attached to a warped casing.

In order to solve the above problems, a resin case according to the present invention is a resin case having a box-shaped casing having a rectangular opening, and a lid attached to the opening of the casing.
The lid has a cover that covers the opening of the casing, and a plate-like hanging part that is suspended from the vicinity of the lower surface edge of the covering and is fitted to the opening of the casing. A warp correction portion having a concave portion cut out, and the warp correction portion has a hypotenuse extending from both side portions of the hanging portion toward the central portion.

  In the resin case according to the present invention, one side of the cover portion is rotatably attached to the upper end portion of the side wall of the casing, and the hanging portion is provided in the vicinity of the edge of the side facing the side attached to the casing. It is configured as a feature.

  Further, in the resin case according to the present invention, the hanging portion has an insertion portion that extends from the side end portion along the lower surface edge of the covering portion and is fitted to the opening of the casing together with the hanging portion, The insertion portion is configured to have a protruding piece protruding below the warp correction portion in the vicinity of the side end portion of the hanging portion.

  Furthermore, the resin case according to the present invention is characterized in that the lower side of the warp correction portion is formed in a curved shape.

  According to the resin case according to the present invention, the drooping portion has a warp correction portion having a lower end cut out in a concave shape, and the warp correction portion has a hypotenuse extending from both sides of the drooping portion toward the central portion. Since the drooping part can be inserted into the opening while correcting the warp of the casing side wall from the corner to the center part where the warp is small, the lid can be easily attached even to a casing with a large warp. can do.

  Further, according to the resin case according to the present invention, the cover is rotatably attached at one side to the upper end of the side wall of the casing, and the hanging part is provided near the edge of the side facing the side attached to the casing. Accordingly, the warp of the side wall of the casing is corrected in order from the vicinity of the corner portion by the warp correction portion with the rotation of the cover portion, and the drooping portion can be inserted, so that the lid can be securely attached to the casing.

  Further, according to the resin case of the present invention, the hanging portion has an insertion portion that extends from the side end portion along the lower surface edge of the cover portion and is fitted to the opening portion of the casing together with the hanging portion. The portion has a protruding piece that protrudes downward from the warp correction portion near the side end portion of the drooping portion, so that the position fluctuation of the side wall corner due to the warp of the side wall can be corrected, and the warp correction portion The left and right ends can be reliably inserted into the opening of the casing.

  Furthermore, according to the resin case according to the present invention, since the lower side of the warp correction portion is formed in a curved shape, the warp can be corrected smoothly from the corner portion to the center of the side wall, so that the drooping is easy. Part can be inserted into the opening.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a resin case 1 in the present embodiment. The resin case 1 in the present embodiment is formed by injection molding, and has a rectangular casing 13 and a deep bottom casing 10 that can accommodate an electronic device and the like, and an opening 13 of the casing 10. And a shallow lid 20 attached to the base.

  The casing 10 is formed by injection-molding a thermoplastic resin material, and is formed in a box shape having an opening 13 at the top from each side wall 11 and the bottom 12. In the present embodiment, the casing 10 and the lid 20 are connected via a hinge (not shown). The lid 20 is rotatably attached to the upper end of the side wall 11 of the casing 10, and the lid 20 can be covered on the casing 10 by the rotation of the lid 20. In addition, an engagement hole 15 is formed in the side wall 11 of the casing 10 to engage with an engagement portion 25 provided in a hanging portion 22 of the lid 20 described later.

  The lid 20 includes a plate-like cover 21 that covers the opening 13 of the casing 10 and a hanging part 22 that is formed on the lower surface of the cover 21. The hanging part 22 is provided in the vicinity of the edge of the side facing the one side of the cover part 21 connected to the casing 10. The drooping portion 22 is formed in a plate shape that hangs substantially vertically downward from the lower surface of the cover portion 21, and the drooping portion 22 is inserted into and fitted into the opening portion 13 of the casing 10. It can be set as the state which covered the part 13. FIG.

  An engaging portion 25 is formed on the outer surface of the drooping portion 22 corresponding to the position of the engaging hole 15 formed in the side wall 11 of the casing 10. Since the engaging part 25 engages with the engaging hole 15 of the side wall 11 in a state where the hanging part 22 is fitted in the opening part 13 of the casing 10, the mounting state of the lid 20 can be maintained.

  As shown in FIG. 1, a warp correction portion 23 is formed at the lower end portion of the drooping portion 22. The warp correction portion 23 is formed by cutting out the lower end portion of the drooping portion 22 into a concave shape, and has a hypotenuse 23a from both side portions 22a, 22a to the central portion of the drooping portion 22. Further, the hypotenuse 23a of the warp correction portion 23 is formed in a curved shape, and an inwardly inclined slope is formed on the side portion 22a of the hanging portion 22. Since the casing 10 is formed by injection molding as described above, as shown in FIG. 1, the side wall 11 warps due to the shrinkage of the resin, and at the central portion in the longitudinal direction of the upper end on the opening 13 side. Is spaced apart from a surface orthogonal to the side wall 11 that functions as a support, and is largely inward of the reference position.

  Further, the drooping portion 22 has an insertion portion 26 that extends from the side end portion 24 along the lower surface edge of the cover portion 21. The insertion part 26 is fitted into the opening 13 of the casing 10 together with the hanging part 22. Moreover, the insertion part 26 has the protrusion piece 27 which protruded below the curvature correction part 23 of the drooping part 22 in the vicinity of the side end part 24, and chamfered the outer side. For this reason, when the cover part 21 is rotated, the protruding piece 27 of the insertion part 26 is inserted into the opening part 13 of the casing 10 before the side part 22 a of the hanging part 22. In addition, since the height from the cover part 21 used as a baseplate is low, the drooping part 22 has hardly changed from the reference position.

  The side wall 11 of the casing 10 corresponding to the drooping portion 22 is warped due to the shrinkage of the resin during molding, and the position of the corner portion 14 of the side wall 11 moves inward due to this warpage. For this reason, when the hanging part 22 is inserted into the opening 13 of the casing 10, the side part 22 a and the corner part 14 may collide. By providing the protruding piece 27 in the insertion portion 26, the protruding piece 27 is inserted into the opening portion 13 before the side portion 22 a of the hanging portion 21, and the position of the corner 11 of the side wall 11 can be corrected. Thereby, the hanging part 22 can be more reliably inserted into the opening 13 of the casing 10.

  Since the side wall 11 of the casing 10 corresponding to the insertion portion 26 is short and high in strength, it is not significantly affected by the shrinkage of the resin at the time of molding and does not cause a large warp. Therefore, by providing a chamfer on the outside of the protruding piece 27 Although it can be inserted, if a large warp occurs here, a warp correction portion may be provided at the lower end portion of the insertion portion 26.

  Next, mounting of the lid 20 will be described. 2 and 3 show the process of attaching the lid 20 to the casing 10, FIG. 2 is a front view, and FIG. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 2A shows a state in which the opening 13 is inserted to the lower end of the drooping portion 22. As shown in FIG. 3A, the insertion portion 26 is inserted into the opening portion 13 to correct the position of the side wall 11 corner portion 14.

  FIG. 2B shows a state where both side portions 22 a and 22 a vicinity of the hanging portion 22 of the warp correction portion 23 are inserted. As shown in FIG. 3B, when the cover portion 21 is rotated in order to cover the cover 20 on the casing 10, first, the side portion 22a of the drooping portion 22 is inserted in the vicinity of the corner portion 14 of the side wall 11 with small warpage. . When the side portion 22 a is inserted in the vicinity of the corner portion 14 of the side wall 11, the warp correction portion 23 partially corrects the warp on the central side with respect to the vicinity of the corner portion 14.

  Since the warp correction portion 23 has a hypotenuse 23a from the side portion 22a to the center portion, when the cover portion 21 is rotated and the drooping portion 22 is further pushed down, as shown in FIGS. 2 (c) and 3 (c), The side wall 11 is inserted from the vicinity of the corner portion 14 to the center portion while sequentially correcting the warp of the side wall 11. For this reason, the drooping portion 22 can be inserted into the opening portion 13 with respect to the casing 10 in which the side wall 11 is warped.

  Thus, the drooping portion 22 can be accommodated in the casing 10 by inserting the warp correction portion 23 into the casing 10 while correcting the warpage from the vicinity of the corner 11 of the side wall 11 to the center portion. That is, even when the warp is large and the end surface of the side wall 11 is located further inside than the end surface of the drooping portion 22 of the lid body 20, the warp is sequentially corrected even if it cannot be inserted by simply providing chamfering. Thus, the drooping portion 22 can be stored in the casing 10. Then, as shown in FIGS. 2D and 3D, the engagement portion 25 of the hanging portion 22 engages with the engagement hole 15 of the side wall 11, whereby the mounting of the lid body 20 is completed.

  In addition, since the warp correction portion 23 is formed with a hypotenuse with a curved line, the warp correction portion 23 can be smoothly inserted along the side wall 11 of the casing 10 without causing a catch or the like. Further, by forming the side portion 22a of the drooping portion 22 in an inwardly inclined shape, the side portion 22a can be easily inserted even when the curvature of the vicinity of the side wall 11 corner portion 14 of the casing 10 is large.

  Although the embodiment of the present invention has been described above, the application of the present invention is not limited to this embodiment, and can be variously applied within the scope of the technical idea.

It is a perspective view of the resin case in this embodiment. It is the front view which showed the process (ad) which mounts a cover body in a casing. 2 is a cross-sectional view taken along the line AA in each figure. It is a perspective view of the conventional resin case. It is sectional drawing of the metal mold | die which forms a casing. It is the top view which looked at the casing of FIG. 4 from the opening part side in the state which opened the cover body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin case 10 Casing 11 Side wall 12 Bottom part 13 Opening part 14 Corner | angular part 15 Engagement hole 20 Lid | cover 21 Cover part 22 Hanging part 22a Side part 23 Warp correction part 23a Oblique side 24 Side end part 25 Engagement part 26 Insertion part 27 Projection Fragment

Claims (4)

In a resin case having a box-shaped casing having a rectangular opening, and a lid attached to the opening of the casing,
The lid has a cover that covers the opening of the casing, and a plate-like hanging part that is suspended from the vicinity of the lower surface edge of the covering and is fitted to the opening of the casing. A resin case, comprising: a warp correction portion having a concave portion cut out, the warp correction portion having a hypotenuse extending from both sides of the hanging portion toward a central portion.   2. The cover is provided with one side rotatably attached to an upper end of a side wall of the casing, and the hanging portion is provided in the vicinity of an edge of the side facing the side attached to the casing. Resin case.   The drooping portion has an insertion portion that extends from the side end portion along the lower surface edge of the cover portion and is fitted to the opening of the casing together with the drooping portion, and the insertion portion is a side end of the drooping portion. 3. The resin case according to claim 1, further comprising a projecting piece projecting downward from the warp correcting section in the vicinity of the section.   The resin case according to any one of claims 1 to 3, wherein a lower side of the warp correction portion is formed in a curved shape.

Images