JPH0739541U - Synthetic resin suitcase - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a synthetic resin suitcase capable of improving both yield and manufacturing efficiency. [Structure] In a suitcase 1 including a pair of cases 2 and 3 each having an opening on one surface, a pattern portion 26 formed by a series of a concave portion and a convex portion is formed in the central portion of the cases 2 and 3, A gate is provided at the corresponding portion, and both cases 2 and 3 are injection-molded.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a suitcase.

[0002]

[Prior art]

 As a conventional suitcase, the one shown in FIGS. 8 and 9 has been proposed (see Japanese Utility Model Laid-Open No. 3-105323). That is, the suitcase 51 is composed of the main body case 52 and the lid case 53. The main body case 52 is a container body that integrally has left and right side walls 54 and 55, front and rear walls 56 and 57, and a rectangular bottom wall 58, and has an opening 59, and is injection molded from synthetic resin. ing. The front wall 56 is provided with a first handle 60 and two buckles 61, 61, the left side wall 54 is provided with a second handle 62, and the right side wall 55 is provided with a caster 70. It is set up.

On the other hand, the lid case 53 is a container body that integrally has left and right side walls 63 and 64, front and rear walls 65 and 66, and a rectangular upper wall 67, and has an opening 68 on the lower surface. Similarly, injection molding is performed using a synthetic resin. The rear wall 66 is pivotally supported by the rear wall 57 of the main body case 52 via a hinge 69, and a caster 70 is disposed on the right side wall 64.

[0004]

[Problems to be solved by the device]

 In such a synthetic resin suitcase 51, both cases 51, 52 are large resin molded products, and especially for overseas travel, both cases 51, 52 are extremely large resin molded products. It becomes an article. Therefore, if injection molding is performed by providing a gate at a comparatively inconspicuous portion such as a corner of each case 51, 52, it becomes difficult to uniformly inject the molten resin into the entire cavity of the mold. Become. As a result, the molten resin is not evenly spread over the entire areas of the cases 51 and 52, and defective molding frequently occurs, resulting in a decrease in yield.

Of course, if a gate is set at the center of each case 51, 52 and injection molding is performed, the molten resin can be spread over the entire area of each case 51, 52, which causes molding failure. Can be suppressed and the yield can be improved. However, when the gate is set in the center of the cases 51 and 52 and injection molding is performed as described above, a gate mark is left in the center of the cases 51 and 52, which are most conspicuous. As a result, the post-processing process for polishing and removing the traces of the gate requires a lot of time, and although the yield can be improved, the manufacturing efficiency is reduced.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a synthetic resin suitcase capable of improving both the yield and the manufacturing efficiency. is there.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, according to the present invention, in a suitcase composed of a pair of cases having an opening on one surface, a pattern portion formed by a series of a concave portion and a convex portion in the central portion of the case. Is formed, a gate is provided at a portion corresponding to the recess, and each case is injection-molded. In addition, preferably, gates are provided at a plurality of portions corresponding to the recesses, and the case is injection molded.

[0008]

[Action]

 In the above structure, each case is injection-molded by injecting molten resin from the gate. At the time of this injection molding, since the gate is provided at a portion corresponding to the concave portion of the pattern portion provided at the center of each case, the molten resin can be injected from the center of each case, As a result, the molten resin is evenly distributed over the entire area of the case.

However, if the resin is injected from the gate, a gate mark will remain in the center of each case after injection molding. However, since the gate trace remains in the concave portion of the pattern portion composed of the continuous concave portion and the convex portion, it is apparently difficult to distinguish between the gate trace and the convex portion in the pattern portion. Therefore, even if post-processing such as polishing the gate traces is not performed, the product is not affected.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. That is, as shown in FIGS. 1 to 5, the suitcase 1 is composed of a main body case 2 and a lid case 3 both of which are injection-molded of synthetic resin. The main body case 2 includes a main wall 4 having a vertically long rectangular shape, upper and lower walls 5 and 6 formed at an upper end portion and a lower end portion of the main wall 4, and a front end of the main wall 4. And a front and rear walls 7 and 8 formed in the rear end portion, which are integral with each other, and include an opening 9. Therefore, like the main wall 4, the opening 9 has a vertically long rectangular shape.

As shown in FIG. 3, a substantially U-shaped first handle 10 is pivotally supported on the front wall 7 at a central portion in the longitudinal direction and near the opening 9. A first buckle 11 is attached between the pivot points of the first handle 10. Further, as shown in FIG. 5, a second handle 12 having the same shape as the first handle 10 is pivotally supported on the upper wall 6 at a central portion in the longitudinal direction and near the opening 9. In addition, the second buckle 13 is attached. The second buckle 13 is arranged on a side portion of the second handle 12 which is separated from a hinge described later, that is, on the front wall 7 side of the second handle 12.

On the other hand, on the lower wall 6, a front caster 14 is attached to a portion close to the front wall 7, and a rear caster 15 having a larger diameter than the front caster 14 is attached to a portion close to the rear wall 8. Further, a third buckle 16 is attached to a corner portion where the front wall 7 and the lower wall 6 are continuous.

On the other hand, similarly, the lid case 3 also has a main wall 17 having a rectangular shape elongated in the vertical direction, upper and lower walls 18 and 19 formed above and below the main wall 17, and the main wall 17 in the same manner. The container body has front and rear walls 20 and 21 integrally formed on the front and rear sides thereof and has an opening 22. Therefore, like the main wall 17, the opening 22 has a rectangular shape that is long in the vertical direction, and the first to third buckles 11, 13, 16 are provided around the opening 22. Are provided with locking portions 23, 24, 25 which can be engaged with each other. As shown in FIG. 2, the front caster 14 is attached to the lower wall 19 at a position close to the front wall 20, and the rear caster 15 having a larger diameter than the front caster 14 is provided at a position close to the rear wall 21. It is installed. Both cases 2 and 3 are pivotally supported so as to be openable and closable relative to each other via a hinge 29 provided on the end edges of the rear walls 8 and 21.

Further, the main walls 4 and 17 of the two cases 2 and 3 are integrally formed with a pattern portion 26 at the center thereof in the vertical direction. As shown in FIG. 6, the pattern portion 26 has a surface curved convex portion 27 having a constant width a extending in the horizontal direction and a concave portion 28 located between the adjacent convex portions 27 continuously. It consists of the formed structure. As shown in FIG. 7, the mold 30 used for molding the cases 2 and 3 is provided with gates 31 at a plurality of locations corresponding to the predetermined recesses 28.

In this embodiment having the above configuration, the cases 2 and 3 are injection molded by injecting a molten resin from the gate 31. At the time of this injection molding, the gate 31 is provided at a portion corresponding to the concave portion 28 of the pattern portion 26 provided at the central portion of each of the cases 2 and 3. Therefore, the molten resin can be injected from the central portion of each of the cases 2 and 3, and as a result, the molten resin is evenly distributed over the entire area of each of the cases 2 and 3. Therefore, the incidence of defective molding can be significantly reduced, and the yield can be improved.

However, if the resin is injected from the gate 31 provided at such a portion, a gate mark will remain at the center of each case 2 and 3 after injection molding. However, the trace of the gate remains in the concave portion 28 in the pattern portion 26 including the continuous convex portion 27 and the concave portion 28. Therefore, when the pattern 26 is visually recognized, even if there is a gate mark in which the concave portion 28 is partially raised, it is apparently difficult to distinguish the gate mark from the convex portion 27. Therefore, even if post-treatment such as polishing of the gate trace is not performed, the remaining portion is not apparently apparent, and sufficient commerciality can be secured.

[0017]

[Effect of device]

 As described above, according to the present invention, each case is formed by forming a pattern portion formed by a series of concave portions and convex portions in the central portion of the case constituting the suitcase and providing a gate at a portion corresponding to the concave portion. Injection molding was performed. Therefore, the resin of the case to be injection-molded can be made uniform as a whole, and the occurrence of molding defects can be suppressed, thereby improving the yield. Moreover, because the pattern of the recesses and protrusions makes it difficult to distinguish the gate traces from the outside, post-processing of the gate traces is also unnecessary, and as a result, both the product yield and manufacturing efficiency are improved. It becomes possible. Further, by providing the gates at a plurality of portions corresponding to the recesses, it is possible to more surely make the resin uniform in the entire case, thereby further improving the yield.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a left side view of the same embodiment.

FIG. 4 is a right side view of the same embodiment.

FIG. 5 is a plan view of the same embodiment.

6 is a cross-sectional view taken along the line aa of FIG.

FIG. 7 is a cross-sectional view of a main part of a mold used for molding the case according to the example.

FIG. 8 is a right side view of a conventional suitcase.

FIG. 9 is a front view of the suitcase.

[Explanation of symbols]

 1 Suitcase 2 Body Case 3 Lid Case 26 Patterned Part 27 Convex Part 28 Concave Part 22 Opening Part 31 Gate

Claims (2)

[Scope of utility model registration request] 1. A suitcase composed of a pair of cases each having an opening on one surface thereof, wherein a pattern portion formed by a series of recesses and protrusions is formed in the center of the case, and the pattern portion is formed at a portion corresponding to the recess. A synthetic resin suitcase characterized in that a gate is provided and each of the cases is injection-molded. 2. A suitcase made of synthetic resin, characterized in that gates are provided at a plurality of portions corresponding to the recesses, and the case is injection-molded.