JPH0454956Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a magnetic tape cassette storage case, and in particular relates to an improvement of a magnetic tape cassette storage case used for storing magnetic tape cassettes used for audio etc. be.

(Prior Art) Magnetic tape cassettes used for audio and the like are normally stored in a magnetic tape cassette storage case (hereinafter simply referred to as a "storage case") made of plastic. The storage case has an opening into which the magnetic tape cassette is inserted into a magnetic head of a recording/reproducing device,
In addition, since the magnetic tape is installed across the opening, it is possible to prevent dust from entering the cassette through the opening, and to protect the magnetic tape located in the opening. It is also used to protect the entire cassette.

FIG. 3 shows the basic structure of a conventional storage case. The storage case 1 consists of a lid part 2 having a pocket 4 into which a magnetic tape cassette 20 is inserted, and a casing part 5 having a pair of anti-rotation protrusions 7 which fit into a shaft insertion hole 22 of the magnetic tape cassette 20. The storage case 1 has a support shaft protruding from the left and right inside of the casing part 5 and a pocket 4.
The casing part 5 and the lid part 2 can be opened and closed like a door by being fitted with holes provided through the left and right side walls of the casing part 5 and the lid part 2, respectively. The storage case 1 is configured such that the distance between the wall portions 3 and 6 facing the front and back surfaces of the magnetic tape cassette 20 corresponds to the thickness of the cassette thickened portion 21 of the magnetic tape cassette 20. Storage case 1
The thickness l ₁ of the cassette is considerably larger than the thickness l ₂ of the cassette other than the increased cassette thickness portion 21 . Therefore, when the magnetic tape cassette 20 is stored in the storage case 1, a considerably larger storage space is required than when the magnetic tape cassette 20 is stored naked.

For this reason, when general users store the magnetic tape cassettes 20 in a limited space, for example, when trying to store as many as possible in a car, they sometimes do not store them in the storage case 1. However, if the magnetic tape cassette 20 is stored without being housed in the storage case 1, dust tends to enter the cassette, causing a problem in that the recording and reproducing characteristics of the magnetic tape cassette 20 deteriorate.

The applicant, who should solve the above problems,
A thin storage case was proposed as disclosed in Japanese Utility Model Application No. 60-163279. This thin storage case is
A recessed portion for receiving the cassette thickened portion 21 of the opening of the magnetic tape cassette 20 is formed in the lid portion 2 and the casing portion 5. That is, the recessed portion is configured to be thinner than other portions. For this reason, the fluidity of the injected resin during molding deteriorates at the recessed portions. Therefore, the problem of fluidity of the injected resin can be solved by providing a resin outflow port (gate) to the cavity of the molding die at a position corresponding to the recess, but the gate is placed in a thin wall such as the recess. It is important not only to provide a gate in a conspicuous position on the product's appearance, but also because residual stress during molding tends to concentrate in and around the gate marks. It was difficult to establish a

On the other hand, a storage case with a structure in which a recess is provided on the opposite side of the pocket and the thickened part of the cassette is received in this recess, as shown in Fig. It is difficult to cover it with paper such as Tux sheet. For this reason, there is a problem particularly in the protection function of the opening of the cassette, and for example, when the opening of the cassette rubs against the inner wall surface of the case, shavings may be generated.

(Problems to be solved by the invention) One of the problems of the present invention is that it is possible to provide a gate in a thin recess in a storage case that has a recess, and the other problem is the protection function of the opening of the cassette. Our objective is to provide a storage case with a structure that enhances this.

(Means for Solving the Problems) The problem of the present invention is to provide a magnetic tape cassette in which a concave portion for receiving the thickened portion of the magnetic tape cassette is provided in the lid portion and the casing portion on the side opposite to the pocket. In the tape cassette storage case, the recess is provided with a protrusion that enters a capstan hole or reference hole of the magnetic tape cassette, and a gate for resin inflow is provided on the outer surface of the case where the protrusion is provided. This problem can be solved by a magnetic tape cassette storage case characterized by the following.

Hereinafter, embodiments of the present invention will be described in detail.

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

The storage case 30 shown in FIG.
A lid part 32 having a casing part 35 and a casing part 35 are pivotally connected in the same manner as in the conventional storage case 1. Lid part 3
In the magnetic tape cassette 2, a recess 38 for receiving the cassette thickened portion 21 constituting the opening of the magnetic tape cassette 20 is formed in a wall portion 33 that widely faces the front and back surfaces of the cassette. Further, in the casing portion 35, a recess 38 for receiving the cassette thickened portion 21 and a pair of rotation prevention protrusions 7 similar to those of the conventional art are formed in the wall portion 36 facing the front and back surfaces of the cassette. ing.

Both recesses 38 are formed inside the case so as to face each other, and have a shape that accommodates the cassette thickened portion 21, that is, a shape that extends outward with respect to the opening/closing axis of rotation of the lid portion 32 and the casing portion 35. For example, it has a trapezoidal shape that expands.

Incidentally, when the storage case 30 is closed, the wall portion 36 and the small wall portion of the pocket 34 parallel to the wall portion 33 are configured to form the same wall surface, as in the conventional case. Also, casing part 3
Although not shown, the opposing surfaces of the left and right side walls 39 of the storage case 30 and the left and right side walls of the pocket 34 facing the side walls 39 are formed with concave and convex portions that fit into each other when the lid of the storage case 30 is closed. It is designed to prevent it from opening unexpectedly.

Wall portion 3 when storage case 30 is closed
The distance between the magnetic tape cassette 2 and the wall 36 is
The thickness _l2 of the cassette other than the increased thickness portion 21 of
The spacing therebetween is configured to be very slightly larger than the thickness _l5 of the cassette thickening section 21.

The material of the storage case 30 may be the same as a conventional one and is not particularly limited. Also, storage case 3
The wall thickness _l4 of the magnetic tape cassette 20 may be the same as the conventional one as long as it satisfies the protection requirements for the magnetic tape cassette 20.

Further, the recess 38 is provided with a protrusion 40 that protrudes inward of the case. This protrusion 40 is the cassette thickened portion 2 of the magnetic tape cassette 20.
It is provided at a position corresponding to the capstan hole 23 or reference hole 24 formed in 1. Therefore, when the magnetic tape cassette 20 is stored in the storage case 30,
As shown in FIG. 2, the protrusion 40 enters into the capstan hole 23 or the reference hole 24, restricts the position of the magnetic tape cassette 20, and suppresses the wobbling of the cassette 20. The front opening of the cassette and the side wall of the storage case 30 (the side wall parallel to the rotation axis) are prevented from coming into contact with each other.

In addition, the gate that is the resin inlet of the mold when injection molding the lid part 32 and the casing part 35 is
It is located outside the case of the protrusion 40. It goes without saying that gates may also be provided at other locations. In this way, since the gate is located at the protrusion 40, the protrusion 40 serves as a resin reservoir, so the gate can be provided in the recess 38, which is a thin wall part, and the case The resin fluidity during molding becomes extremely good, and moldability can be improved. Therefore,
Problems such as the occurrence of weld lines and cracks due to low resin fluidity are also avoided.

When storing the magnetic tape cassette 20 in the storage case 30 configured as described above, insert the cassette rear portion (opposite side of the opening) of the magnetic tape cassette 20 into the pocket 34 of the storage case 30 with the lid opened. . At this time, the recess 3 of the lid 32
8 corresponds to one side of the cassette thickened portion 21, and when the projection 40 is fitted into, for example, the capstan hole 23, and the lid portion 32 is closed, the other side of the cassette thickened portion 21 corresponds to the recess 38 of the casing portion 35. At the same time, the other protrusion 40 is fitted into the capstan hole 23, the rotation prevention protrusion 7 is fitted into the reel shaft insertion hole 22, and the magnetic tape cassette 20 is stored in the storage case 30.

The size of the protrusion 40 in the present invention is such that it can fit into the capstan hole 23 or the reference hole 24, for example, and can function as a resin pool, and also prevents the magnetic tape cassette 20 from wobbling. There is no particular restriction as long as the size can prevent this.

In the embodiment described above, two protrusions 40 are provided in each of the two recesses 38, but the present invention is not limited to this embodiment, and the number of protrusions 40 is particularly limited as long as they are up to four in each of the upper and lower parts. It's not a thing. Moreover, when providing one each in the lid part 32 and the casing part 35, it is preferable not to provide them in positions facing each other in the upper and lower directions. That is, in the case of one magnetic tape cassette 20, by shifting their positions, the effect of regulating the position of the magnetic tape cassette 20 (effect of preventing rattling) can be enhanced.

(Effects of the invention) As described above, since the storage case is provided with a recess for receiving the thickened portion of the magnetic tape cassette as in the present invention, the thickness of the storage case is smaller than that of the conventional case. , a protrusion that enters the capstan hole or reference hole is formed in the recess, which is the thin wall part, and the gate during case molding is located outside of this protrusion, so that the resin flow during molding is prevented. Due to the presence of the protrusion in the part facing the gate, the space forming the protrusion serves as a receiving part for the injected resin, which not only improves resin fluidity during molding, but also improves the fluidity of the resin during molding. Even if residual stress concentrates in the gate trace area, since the gate part is thickened by the protrusion, it is possible to provide a storage case with high quality in terms of strength, and the protrusion also prevents magnetic This prevents the tape cassette from rattling inside the case.
It is possible to provide a storage case with improved cassette protection effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of main parts showing a state in which a magnetic tape cassette is stored in the storage case shown in FIG. 1, and FIG.
The figure is a perspective view showing a conventional storage case. 1, 3...Magnetic tape cassette storage case,
2, 32... Lid part, 3, 6, 33, 36... Wall part, 4, 34... Pocket, 5, 35... Casing part, 7... Anti-rotation protrusion, 20... Magnetic tape cassette, 21 ...cassette thickened section, 22
... Reel shaft insertion hole, 23 ... Capstan hole, 24 ... Reference hole, 38 ...
... recess, 40... protrusion.

Claims (1)

[Scope of utility model registration request] A magnetic tape cassette storage case in which a recess for receiving a thickened portion of a magnetic tape cassette is provided in a lid part and a casing part so as to face the opposite side of the pocket, the magnetic tape cassette being placed in the recess. What is claimed is: 1. A magnetic tape cassette storage case characterized in that a protrusion that enters a capstan hole or a reference hole is provided, and a gate for resin inflow is provided on the outer surface of the case where the protrusion is provided.