JPH0728818U - Storage case and its molding device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention has an injection port for injection molding disposed in each one of the pieces, and molding is performed to open one side in a developed shape without burr or warp. Storage case and its molding device. [Structure] The storage case 1 includes a rectangular back plate piece 2
And left and right side plate pieces 3, 4 which are continuously provided along the left and right sides of the back plate piece 2 via a pair of vertical hinge portions 11, 12.
And the overlapping piece portions 5 and 6 that extend outward via the horizontal hinge portions 13 and 14, and the overlapping piece portions 7 and 8 that extend outward via the horizontal hinge portions 15 and 16. Then, the injection ports (gates) P1 to P7 of the injection molding device are arranged at the centers of the respective pieces 2 to 8 to obtain a storage case in a form expanded by injection molding.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a box-shaped storage case which is expanded and injection-molded into a sheet shape and a molding apparatus for the same.

[0002]

[Prior art]

 Conventionally, a box-shaped storage case with one surface opened is molded in an expanded shape. That is, first, a synthetic resin material is formed into a sheet by using a sheet forming machine, and the surface of the sheet is decorated with a satin finish, letters, lines, etc. Then, printing is performed, the sheet is cut along a mold into a developed shape by a pressing machine, and a hinge portion composed of a linear groove is pressed by pressing an edge of a heater or the like. In this way, the storage case in the unfolded form is completed, and this is assembled on the box making line to complete the storage case as a finished product. Since the storage case in such a developed form requires a large number of steps, it has a drawback that the work is complicated and the structure of the molding apparatus is complicated. Further, since the sheet is cut, the material is wasted.

[0003]

[Problems to be solved by the device]

 Therefore, it is convenient to use injection molding to create a mold for the storage case that has been expanded with a mold in advance, and to integrally form it by injection molding, but it is sheet-shaped and thin, and the shape of each formed piece is uniform. If it is not, burr will occur, and if the burr is stopped, the sheet will warp. Also, when the hinge part is molded at the same time, the pressure applied to each part cannot be uniform because the material flows over the hinge part, and the curing speed (shrinkage rate) is different in one piece. Warps. This invention was devised to eliminate the above-mentioned drawbacks, and its main problem is to arrange injection molding ports for injection molding in each one of the parts and mold it to prevent burrs and warpage. An object of the present invention is to provide a storage case having a non-expanded shape and its molding device. Another object of the present invention is to provide a storage case that prevents the tape cassette from falling out by providing a protrusion that protrudes inwardly in the storage case and engages with the stored tape cassette. A further object of this invention is to provide a storage case in which the hinge portion can be easily bent. Yet another object of the present invention is to provide a molding device in which a molded product does not adhere to the fixed member during molding and is easily removed from the mold.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, in the invention of claim 1, (a). A rectangular back plate piece, and a pair of thin lines linearly set along the left and right sides of the back plate piece. Each of the left and right side plate pieces and the left and right side plate pieces that are continuously provided via the vertical hinge section is continuously provided through the horizontal hinge section that is linearly thin along the upper and lower sides. A box-shaped storage case, which is composed of a pair of upper and lower overlapping pieces and has an opening on one side, and (b). The expanded storage case integrally forms the hinge portion with each piece. At the same time, the technical measures are taken such that the injection port is arranged in each of the pieces and injection molding is performed. Further, in the invention of claim 2, a technical means is provided in which a protrusion protruding inward is integrally formed on the overlapping piece portion so as to be releasably hooked in the recess of the accommodated tape cassette. ing. In the third aspect, the technical means is adopted in which the hinge portion forms the auxiliary groove at a position facing each other on the back surface of the groove. Further, in claim 4, there is provided an apparatus for molding the storage case according to claim 1, which comprises (c) a movable side member having a mold and a fixed side member provided with an inlet. d). The mold is formed so as to integrally form a hinge part together with each piece, and (e). The mold is arranged in the approximate center of each piece separated by the hinge part. We have taken the technical means that it has injection holes and is injection molded. According to claim 6, in addition to the above-mentioned constitution, (f). Molding in which part of the tip of the fixed side member abuts the contact surface of the movable side member with the fixed side member and the other part is filled in the mold. A technical means is provided in which a push-out auxiliary pin capable of colliding with the product is provided, (g). A biasing means is provided for biasing the push-out auxiliary pin toward the movable side member so as to be able to return.

[0005]

[Action]

 Since the injection molding injection port is formed in each of the individual parts, the material injected from each injection port is filled within the range partitioned by the hinge part and exceeds the hinge part. Since it does not occur, the pressure is uniform, each piece does not warp, and burr does not occur. Further, if the protruding portion is provided on the overlapped piece portion, the protruding portion can be hooked in the recessed portion of the accommodated tape cassette, so that the tape cassette can be prevented from being pulled out. Further, by forming the hinge portion so that the groove and the auxiliary groove face each other on the front and back sides, it is possible to smoothly bend the groove so as to surround the groove. If the molding device is equipped with a push-out auxiliary pin and a biasing means, it is possible to prevent the molded product from adhering to the fixed member side when separating the molded product (the storage case in the expanded form) after injection molding, and the ejector. The pin can surely separate the molded product from the mold.

[0006]

【Example】

 Hereinafter, preferred embodiments of the storage case and the molding apparatus of the present invention will be described with reference to the drawings. The storage case 1 shown in FIG. 1 shows an expanded form, and includes a rectangular back plate piece portion 2 and a pair of vertical hinge portions 11 and 12 along the left and right sides of the back plate piece portion 2. The left and right side plate pieces 3 and 4 connected in series are connected in the lateral direction.

The left side plate piece 3 is formed with horizontal hinge portions 13 and 14 along the upper and lower sides, and the outer overlapping piece portion 5 is connected via the upper horizontal hinge portion 13 and the lower horizontal piece 13 is connected. The overlapping piece portion 6 on the outer side is connected via the hinge portion 14. Similarly, the right side plate piece portion 4 has horizontal hinge portions 15 and 16 formed along the upper and lower sides thereof, and the inner overlapping piece portion 7 is connected via the upper horizontal hinge portion 15 and the lower horizontal hinge portion is connected. The overlapping piece portion 8 on the inner side is connected via the portion 16. Further, the back plate piece 2 is formed with horizontal hinge portions 17, 18 along the upper and lower sides thereof, and the folding-back auxiliary piece portions 9A, 9B are connected to each other via the horizontal hinge portions 17, 18. .

Here, each of the hinge portions 11 to 18 is composed of a linear groove G1 which is recessed in the bending direction and which is thin. As shown in FIG. 2A, the groove G1 is set to have a small thickness, and in this embodiment, the thickness of each piece is 0.5 to 0.6 mm, while the groove G1 is It is preferable that the thickness left in the portion is set to 0.1 mm or more and less than 0.2 mm in order to bend the groove G1 so as to surround it. FIG. 2 (b) shows a different embodiment in which an auxiliary groove G2, which is slightly smaller than the center of the groove G1 at the position opposed to the groove G1, is provided. In this case, since the auxiliary groove G2 is provided, it is easy to bend the groove G1 inward as a fold line (easy to make a valley fold), so that it can be surely bent at the time of box making.

As shown in FIG. 3, a molding device 21 for molding this storage case includes a movable side member 23 having a mold 22 and fixed side members provided with injection ports (gates) P1 to P7. It consists of 24. A plurality of inlets may be provided in each piece, and for example, three inlets may be provided in the left and right side plate pieces 3 and 4 and the overlapping pieces 5 to 8 at equal intervals in the lateral direction at the center. (Not shown). The die 22 is formed so as to integrally form a hinge portion with each of the pieces, and if a decoration such as a satin finish or a pattern to be applied to the surface of the storage case is engraved on the die 22. , Can be molded at the same time.

Here, the inlets (gates) P1 to P7 are separated by the hinges 11 to 18 (back plate piece 2, left and right side plate pieces 3, 4 and respective overlapping pieces 6 to 6). It is set in the center of 9). In addition, in the side plate piece portions 3 and 4, injection ports P2 and P3 are formed at the centers of the side plate piece portions 3 and 4, respectively. In the overlapped piece portions 5 to 8, injection ports P4 to P7 are similarly formed. It should be noted that the back plate piece 2 has only one inlet P1, and the folding back auxiliary pieces 9A and 9B have no inlet.

Therefore, in the back plate piece portion 2, the left and right side plate piece portions 3 and 4, and the respective overlapping pieces 6 to 9, the material such as polypropylene injected from the respective injection ports P1 to P7 is used. It is filled within the range partitioned by the hinge parts 11 to 18 and does not exceed the hinge parts 11 to 18, so that the pressure is uniform, each part does not warp, and burrs do not occur. It can be molded. Since the folding assisting pieces 9A and 9B connected to the upper and lower sides of the back plate piece 2 are small in shape, even if the back plate piece 2 is provided with an injection port, it is formed beyond the horizontal hinge portions 17 and 18. be able to. However, an injection port may be provided in each of these portions.

[0012] Incidentally, the overlapping piece 7 on the inner side is integrally formed with a protrusion 31 that protrudes inward during assembly. The protrusion 31 can be engaged with and disengageably hooked in the recess of the tape cassette to be stored. Therefore, when the tape cassette is stored, the projection is fitted in the recess, and the tape cassette can be hooked on the storage case, so that the tape cassette is prevented from falling out. When pulling out the tape cassette, it is sufficient to pull it strongly so that the recessed portion can get over the protrusion. As shown in FIG. 3, when the raised portions 31a on the upper surface of the protrusion 31 are set to be small enough to be fitted into the raised portions 31b on the lower surface, it is possible to stack the expanded sheet-like storage cases. It is preferable because it does not get in the way.

Further, in the molding device 21, a part of the tip of the fixed side member 24 abuts against the contact surface of the movable side member 23 with the fixed side member 24, and the other part is filled in the mold. An extruding auxiliary pin 25 that abuts against the molded product is provided, and a spring 26 is provided at the base end of the extruding auxiliary pin 25 to urge the extruding auxiliary pin 25 toward the movable member 2 side so as to be able to return. is doing. Therefore, when a molded product is molded in the mold 22 by injection molding and the movable side member 2 separates, the pushing auxiliary pin 25 projects due to the urging force of the spring 26, preventing the molded product from adhering to the fixed side member 24. . Then, the molded product can be ejected and separated from the mold 22 of the movable member 2 by the ejector pin 27. Although the folding-back auxiliary piece portion is formed in the above-mentioned embodiment, it is not necessary to provide this. In addition, the object to be stored in the storage case according to the present invention is not limited to the tape cassette, and an appropriate article can be stored.

[0014]

[Effect of device]

 As described above, according to the present invention, an injection port for injection molding is arranged in each of the individual pieces of the storage case in the expanded shape for molding, and the storage shape in the expanded shape without burr and warp is formed. The case can be easily molded, suitable for industrial mass production, and cost can be reduced. Also, since it is injection molding, the surface can be decorated at the same time as molding, and the finished product can be made in one molding. Further, since the insert piece can be used in the mold, a part of the decoration can be easily changed. In addition, the storage case can be provided with a protrusion that engages with the accommodated tape cassette to prevent the tape cassette from falling off. Furthermore, an auxiliary groove can be provided on the back surface of the hinge portion to facilitate bending, and thus the storage case can be easily made. In addition, an auxiliary pin is provided on the fixed-side member of the injection molding device so that the molded product does not adhere to the fixed-side member during molding and can be easily removed from the mold, which is extremely useful.

[Brief description of drawings]

FIG. 1 is a development view of a preferred embodiment of the storage case of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a hinge part, where (a) is a structure having only a groove and (b) is a view showing a different embodiment in which an auxiliary groove is provided.

FIG. 3 is a partial cross-sectional view showing a protrusion for engagement.

FIG. 4 is a cross-sectional view showing an injection molding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage case 2 Back plate piece part 3 Left side plate piece part 4 Right side plate piece part 5-8 Overlapping piece part 11-18 Hinge part 21 Molding device 22 Mold 23 Movable side member 24 Fixed side member 25 Auxiliary pin 26 Spring P1 P7 inlet

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Claims (6)

[Scope of utility model registration request] 1. A left and right side plate piece portion continuously formed via a rectangular back plate piece portion and a pair of vertical hinge portions linearly set along the left and right sides of the back plate piece portion. And, on each of the left and right side plate pieces, one side is composed of a pair of upper and lower overlapping pieces that are continuously provided via horizontal hinge portions that are thinly set linearly along the upper and lower sides. A box-shaped storage case having an opening, wherein the expanded storage case is injection-molded with the hinge portion integrally formed with each piece, and an injection port is arranged in each piece. A storage case characterized by 2. A storage case for storing a tape cassette, wherein a protrusion protruding inward at the time of assembling is integrally formed with the overlapping piece portion so that the storage cassette can be detachably engaged with the recessed portion of the stored tape cassette. The storage case according to claim 1, wherein the storage case is stopped. 3. The hinge part comprises a groove that is recessed in the bending direction and is thinly formed, and an auxiliary groove that is formed at a position facing each other on the back surface of the hinge part. Storage case. 4. A rectangular back plate piece and left and right side plate pieces that are continuously provided via a pair of vertical hinges linearly thin along the left and right sides of the back plate piece. And, on each of the left and right side plate pieces, one side is composed of a pair of upper and lower overlapping pieces that are continuously provided via horizontal hinge portions that are thinly set linearly along the upper and lower sides. A molding device for molding an open box-shaped storage case, comprising a movable-side member having a mold formed therein and a fixed-side member provided with an injection port, wherein the mold is hinged together with each piece. Is formed so as to be integrally formed with each other, and is formed by injection molding with an injection port arranged substantially at the center of each of the pieces partitioned by the hinge part. Case molding equipment. 5. The apparatus for molding a storage case according to claim 4, wherein a plurality of inlets are formed laterally at equal intervals in the center of the side plate piece. 6. The left and right side plate pieces connected to each other through a rectangular back plate piece and a pair of vertical hinges linearly thin along the left and right sides of the back plate piece. And, on each of the left and right side plate pieces, one side is composed of a pair of upper and lower overlapping pieces that are continuously provided via horizontal hinge portions that are thinly set linearly along the upper and lower sides. A molding device for molding an open box-shaped storage case, comprising a movable-side member having a mold formed therein and a fixed-side member provided with an injection port, wherein the mold is hinged together with each piece. Is formed so as to be integrally formed, and is injection-molded with an injection port arranged substantially at the center of each piece separated by the hinge part. A molded product in which part of the tip abuts the contact surface of the movable member with the fixed member and the other part is filled in the mold A device for molding a storage case, comprising: a push-out auxiliary pin capable of colliding with the push-out auxiliary pin; and a biasing unit for biasing the push-out auxiliary pin toward the movable member side so as to be able to return.