JP2001106286A - Housing case of magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing case of magnetic tape cassettes which is satisfactorily molded and free from slippage and falling when being heaped up in piles. SOLUTION: A housing case 10 of magnetic tape cassettes is made up by combining a first case 11 which comprises a first flat plate and first side walls 13 and a second case 21 which comprises a second flat plate 22 and second side walls 24, and made available for housing a magnetic tape cassette therein. Holding protuberances are provided at peripheral parts at the exterior of the first flat plate while holding dents 26 to which protuberances in shapes the same as the protuberances can be fitted are provided at peripheral parts at the exterior of the second flat plate 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a storage case for a magnetic tape cassette, and more particularly to a storage case for a magnetic tape cassette having good injection moldability.

[0002]

2. Description of the Related Art Generally, in audio equipment and video equipment, a pair of tape reels each having a magnetic tape wound thereon are rotatably held in a cassette body. On the other hand, in a computer or the like, a single reel type in which a single tape reel around which a magnetic tape is wound is rotatably held in a cassette body is used. These magnetic tape cassettes are carried or stored in a storage case in order to protect them from dust, impact from dropping, and the like. There are various types of magnetic tape cassette storage cases depending on the form of the magnetic tape cassette to be stored.

FIG. 4 shows a storage case for a one-reel type magnetic tape cassette. The storage case 70 includes a storage section 71 for storing the magnetic tape cassette 90 and a storage section 7.
And a cover 81 that covers the cover 1. The storage unit 71 includes a flat plate 72 and side walls 73 erected on three sides around the flat plate 72,
An opening is formed at a portion where the side wall 73 is not provided (the right side in the drawing).

[0004] The lid portion 81 has a configuration in which a closing lid 84 capable of closing the opening of the storage portion 71 when combined with the storage portion 71 is provided upright along one side of the flat plate 82. The flat plate 8
Side walls 83 are erected on a pair of sides adjacent to the side where the second closing lid 84 is erected. The side of the flat plate 82 where the closing lid 84 or the side wall 83 is not provided is connected to the storage unit 71 via a thin hinge 85 so as to be bendable.

[0005] The storage case 70 for the magnetic tape cassette comprises:
Two grooves 8 are formed on the outer surface (the upper surface in the figure) of the flat plate 82 of the lid portion 81.
6, two ribs (not shown) corresponding to the grooves 86 are provided on the outer surface (lower surface in the figure) of the flat plate 72 of the storage portion 71.
Is provided. Two grooves 86 separately provided on the closing lid 84 side and the hinge 85 side of the flat plate 82 of the lid portion 81 extend in parallel with the closing lid 84 and the hinge 85 and from one side wall 83 to the other side wall 83. Long side, parallel to the side wall 83, and 1/4 to 1 of the total length of the side wall 83
It has a rectangular frame shape having a short side extending over a length of about / 3.

The flat plate 72 of the storage section 71 is provided with two frame-shaped ribs (not shown) corresponding to the grooves 86. Therefore, when a plurality of storage cases 70 are stacked, the frame-shaped ribs of the upper storage case are engaged with the grooves 86 of the lower storage case, and side slip and collapse of the stack are prevented.

The storage case 70 for the magnetic tape cassette is injection-molded with a synthetic resin. At the time of molding, the molten resin is filled into the cavity of the molding die from a predetermined gate.

[0008]

When the storage case 70 is molded, the molten resin is pressurized in order to obtain a good surface form of the molded article, and the molten resin flows through the cavity at a predetermined flow rate. In particular, flat plates 72, 8 having a large area and being an important design surface
It is required to flow the molten resin at a high speed in the cavity portion for molding 2. However, the storage case 70 described above has a configuration in which a groove 86 is provided over a wide area of the flat plate 82 of the lid portion 81 and a rib is provided over a wide area of the flat plate 72 of the storage portion 71 in order to prevent collapse. A portion of the flat plate 82 of the lid portion 81 where the groove 86 is provided is thin. In such a mold for forming the flat plate 82, the flow path becomes narrow at the portion of the cavity where the groove 86 of the flat plate 82 is formed, and the smooth flow of resin is hindered. The portion of the flat portion 72 of the storage section 71 where the ribs are provided is thick. In such a mold for forming the flat plate 71, the portion of the cavity where the ribs of the flat plate 72 are formed is difficult to be filled with the molten resin, and bubbles are easily generated. Therefore, the flat plate 7 which is the design surface
Molding failure was likely to occur at the conspicuous portions (center portion, etc.) of 2,82.

Further, the present inventors have found that the central portions of the flat plates 72 and 82 of the storage case 70 tend to be bent toward the inner space side or the outside of the storage case. It has been found that, when a plurality of sheets are stacked, the ribs of the upper storage case and the grooves of the lower storage case do not engage at the center of the flat plate.

The present invention has been made on the basis of the above background, and an object of the present invention is to provide a housing for a magnetic tape cassette which is capable of preventing side slippage and collapse of a plurality of stacked sheets and having good moldability. Is to provide a case.

[0011]

The object according to the present invention is to combine a first case having a first flat plate and a first side wall with a second case having a second flat plate and a second side wall. In a magnetic tape cassette storage case capable of storing a magnetic tape cassette therein, a locking convex portion is provided on an outer peripheral portion of the first flat plate, and the same as the locking convex portion on an outer peripheral portion of the second flat plate. The present invention can be achieved by a magnetic tape cassette storage case, wherein a locking concave portion having a shape to which a convex portion having a shape can be fitted is provided.

Here, the peripheral portion of the flat plate means a region within 1/4 of the outer dimension of the flat plate from the peripheral edge of the flat plate.
For example, if the flat plate is a rectangle having a long side X and a short side Y, the long side X
From the short side Y to the position closer to the center of the Y / 4 plate, and X from the short side Y to the long side X direction.
The region up to the position closer to the center of the / 4 plate is the peripheral edge. The number and form of the locking projections (locking recesses) are not limited. For example, they can be separately provided at four corners of a rectangular flat plate. It is preferable that the fitting state between the locking projection and the locking recess is such that the stacked upper and lower storage cases do not shift in the plane direction of the flat plate.

According to the magnetic tape cassette storage case having the above-described configuration, since no convex portion or concave portion is provided in the central portion of the flat plate, the resin in the portion of the cavity where the central portion of the flat plate is molded during molding is formed. Good fluidity.
Therefore, molding defects are less likely to occur in the central portion of the flat plate, which is an important design surface, and the moldability is good. Then, by fitting the locking concave portion and the locking convex portion, it is possible to reliably prevent the side slip and the collapse of the stack when a plurality of the storage cases are stacked.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In addition, about the member etc. already demonstrated, description is simplified or abbreviate | omitted by attaching | subjecting the same code | symbol in a figure, or an equivalent code | symbol. FIG. 1 is a perspective view of a storage case 10 for a one-reel type magnetic tape cassette according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of FIG.
It is A sectional drawing. In these figures, the lower storage case when the storage cases 10 are stacked is shown by imaginary lines. The storage case 10 includes a storage unit 11 that stores a magnetic tape cassette, and a lid 21 that covers the storage unit 11.

The accommodating portion 11 has a side wall 13 which is integrally provided on the outer periphery of a substantially square flat plate 12 on three sides.
There is an opening at the place where there is no (the right side in FIG. 1).
Near the base of the side wall 13 in the opening, a substantially triangular reinforcing portion 15 for connecting the side wall 13 and the flat plate 12 is provided.

The lid 21 has a closing lid 24 integrally erected along one side of the flat plate 22 and a side wall 23 integrally formed on a pair of sides of the flat plate 22 adjacent to the side where the closing lid 24 is erected. It is configured to stand upright. The side of the flat plate 22 where the closing lid 24 or the side wall 23 is not provided is connected to the storage unit 11 via a thin hinge 25 so as to be bendable.

The storage case 10 has recesses 26 at four corners on the outer surface (the upper surface in the figure) of the flat plate 22 of the lid 21. The concave portion 26 has a right-angled triangular shape in a plan view in which two sides sandwiching a right angle are respectively parallel to the two sides of the flat plate 22. The storage case 10 has a projection 1 having the same shape as the projection fitted to the recess 26 at each of four corners on the outer surface (lower surface in the figure) 12 of the flat plate of the storage 11.
6 are provided. That is, the projection 16 has a triangular shape which is a right angle in a plan view.

As shown in FIG. 2, the side wall 23 of the lid 22
Is provided at a position shifted from the peripheral edge of the flat plate 22 toward the internal space side of the storage case 10 by the thickness of the side wall 13 of the storage section 11. The recess 2 provided on the outer surface of the flat plate 22
6 and a side wall 23 provided on the inner surface of the flat plate 22 overlap when viewed in a direction perpendicular to the flat plate 22.

According to the magnetic tape cassette storage case 10 having the above-described configuration, since the convex portions or the concave portions are not provided at the central portions of the flat plates 12 and 22, the cavities are formed at the center of the flat plates 12 and 22 during molding. The resin fluidity in the part where the part is molded is good. Therefore, molding defects are less likely to occur in the central portions of the flat plates 12 and 22, which are important design surfaces, and the moldability is good. The concave portion 26 and the convex portion 16 provided at the corners of the flat plates 12 and 22 make this storage case 10
Side stacking and collapse of stacking when a plurality of sheets are stacked can be reliably prevented.

A concave portion 26 provided on the outer surface of the flat plate 22 of the lid portion 21 and a side wall 23 provided on the inner surface of the flat plate 22 are provided.
Overlap in a direction perpendicular to the flat plate 22.
Therefore, the narrowing of the flow path in the portion of the cavity of the molding die where the concave portion 26 of the flat plate 22 is formed can be compensated for by the portion in which the side wall 23 is formed.
Formability can be further improved. In addition, since irregularities are formed at the corners which are thick portions, the dimensional stability is good, and even if the other portions are slightly warped, the stacking function is not affected.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, the positions and shapes of the locking concave portions and the locking convex portions are different from those of the first embodiment, but other portions not described below are the same as those of the first embodiment. Four recesses 46 are provided on the outer surface (the upper surface in the figure) of the flat plate 42 of the lid portion 41 of the magnetic tape cassette storage case 30, and four recesses 46 are provided on the outer surface (the lower surface in the figure) of the flat plate of the storage portion 31. Are provided (not shown). The concave portion 46 has a rectangular shape in a plan view, and is separately provided at the center of each side of the substantially square flat plate 42.

Also in the magnetic tape cassette storage case 30 having the above-described structure, the convexity or the concave portion is not provided at the center of the flat plate 42, so that the moldability is good. Then, the storage case 30 is formed by the concave portion 46 and the convex portion.
Side stacking and collapse of stacking when a plurality of sheets are stacked can be reliably prevented.

Note that the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.
For example, in the above-described embodiment, the storage units 11, 3
Although 1 has an opening and lids 21 and 41 have closing lids 24 and 44 for closing the openings, the forms of the storage unit and the lid are not limited to these. Further, the lid and the storage section do not need to be connected via the thin hinge. For example, a configuration in which a lid separate from the storage section is fitted to the storage section may be employed.

[0024]

According to the storage case for a magnetic tape cassette of the present invention, a locking projection is provided on the outer peripheral edge of the first flat plate, and the outer peripheral edge of the second flat plate has the same shape as the locking convex portion. A locking recess is provided having a shape to which the projection can be fitted. That is, since no convex portion or concave portion is provided in the central portion of the flat plate, the resin fluidity in the portion of the cavity where the central portion of the flat plate is molded during molding is good. Therefore,
Molding defects are less likely to occur at the center of the flat plate, which is an important design surface, and the moldability is good. Then, by fitting the locking concave portion and the locking convex portion, it is possible to reliably prevent the side slip and the collapse of the stack when a plurality of the storage cases are stacked.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a view showing a conventional magnetic tape cassette storage case.

[Explanation of symbols]

 10, 30 Storage case for magnetic tape cassette 11, 31 Storage portion (first case or second case) 12 Flat plate (first flat plate or second flat plate) 13, 33 Side wall (first side wall or second side wall) 16 Convex portion (Locking projection) 21, 41 Lid (first case or second case) 22, 42 Flat plate (first or second flat plate) 23 Side wall (first or second side wall) 24, 44 Closing lid ( 26, 46 recess (locking recess)

Claims (1)

[Claims] A magnetic tape cassette capable of storing a magnetic tape cassette therein by combining a first case having a first flat plate and a first side wall with a second case having a second flat plate and a second side wall. In the storage case for use, a locking projection is provided on the outer peripheral edge of the first flat plate, and a projection having the same shape as the locking projection can be fitted on the outer peripheral edge of the second flat plate. A storage case for a magnetic tape cassette, wherein a storage recess is provided.