Casing for Housing a Cartridge

The present invention relates to a casing for housing a cartridge, which is used to house, transport and keep a cartridge or the like which includes a disk-like medium, such as an optical disk, a magneto-optic disk, and a floppy disk and a tape-like medium, such as a digital compact cartridge (DCC).

In general, the cartridge is dealt with in such a manner that it is housed in a casing in transportation, storage and sales. One known arrangement of such a casing is that the casing is constituted by an upper and lower covering halves formed in two parts, a cartridge can be inserted and withdrawn through an opening formed in one side, and the casing has spring members arranged therein as engagement means for elastically engaging with stepped portions in the cartridge in order to prevent the cartridge from dropping out of the casing.

The conventional casing has such a structure that the spring members which are arranged as the elastic engagement means in the lower half P are mounted, as separate parts, to the lower half P and assembled into it. This structure creates problems in that the number of parts is great, and that it is unreliable because a locking force or the like is subject to variations and the cartridge can drop out of the casing. In addition, the conventional casing involves disadvantages in that assembly is not easy, and the manufacturing process is complex, which leads to a substantial cost and low productivity.

It is an object of the present invention to solve the problems and eliminate the disadvantages, and to provide a casing for housing a cartridge capable of increasing safety in dealing with a cartridge, having effective assembly, lowering cost in a significant manner, and improving productivity in a substantial manner.

The foregoing and other objects of the present invention have been attained by providing a casing for housing a cartridge, comprising an upper half and a lower half which are formed in two parts and are assembled so as to be adapted to house a cartridge in the casing; an opening for allowing the cartridge to be inserted into the casing and to be withdrawn from it, which is arranged in the sides of the casing; and a holding portion which is elastically engageable with a stepped portion in the cartridge to be housed; wherein the holding portion is formed on and in at least of one of the halves so as to be integral with the one half.

It is preferable that the holding portion is constituted by a projection which protrudes from an inner surface of a sidewall of the one half in a direction substantially orthogonal to the direction of insertion and withdrawal of the cartridge to exhibit a convex surface of a circular arc shape.

It is preferable that the holding portion is a projection which is formed by a convex surface having a curvature of R, and wherein the curvature satisfies the following equation:

where d is the distance by which the projection extends into the stepped or recessed portion of the cartridge.

It is preferable that the holding portion is formed in one of the halves so as to be integral with it, the one half extending outwardly farther than the other half with respect to the portion where the holding portion is engaged with the stepped portion of the cartridge.

It is preferable that the holding portion is formed on an arm which is formed so as to be integral with the one half and to be deformable in the one half.

It is preferable that the arm is connected to the one half at the side of the opening, and the holding portion is formed at the leading edge of the arm which extends so as to be substantially parallel with the direction of insertion and withdrawal of the cartridge.

It is preferable that the upper and lower halves have such a structure that both halves are engaged with each other by ridge and groove connection which is formed on three sides except for the side where the opening is formed, and the arm with the holding portion thereon is connected to one of the halves which forms an inner side of the sides in engagement by the ridge and groove connection.

The casing in accordance with the present invention is used in such a manner that insertion and withdrawal of a cartridge are made through the opening. When the cartridge is pushed into the casing, and the stepped portion of the cartridge gets in touch with the holding portion which is formed on one of the halves, the holding portion is elastically deformed so as to be in engagement with the stepped portion. The cartridge can be held in the casing in a locking manner, and can be safely kept in the casing. In addition, when the cartridge is withdrawn from the casing, the holding portion can be deformed so as to disengage with the stepped portion by holding an edge of the cartridge which is exposed at a cutout portion of the opening and pulling the cartridge out of the casing. The cartridge can be smoothly drawn out by sliding, making handling easy.

In accordance with the present invention, assembly of the casing with a reliable locking engagement means can be made remarkably effective, the number of parts is small, there are no variations in locking force, smooth insertion and withdrawal operation can be ensured, and safety in handling a cartridge can be increased. Assembly is good, the cost can be significantly lowered, and productivity can be substantially improved.

Various other objects, features and attendant advantages of the present invention will be more fully appreciated as the same becomes better understood from the following detailed description when considered in connection with the accompanying drawings in which like reference characters designate like or corresponding parts throughout the several views and wherein:

FIG. 1 is a plan view, partially cut away, of a first embodiment according to the present invention;

FIG. 2 is an enlarged plan view showing a portion of the embodiment shown in FIG. 1;

FIG. 3 is an enlarged vertical section taken substantially along line III--III of FIG. 2;

FIG. 4 is an enlarged vertical section taken substantially along line IV--IV of FIG. 1;

FIG. 5 is an enlarged vertical section taken substantially along line V--V of FIG. 1;

FIG. 6 is an enlarged vertical section taken substantially along line VI--VI of FIG. 1;

FIG. 7 is a plan view, partially cut away, of a second embodiment according to the present invention;

FIG. 8 is an enlarged plan view showing a portion of the second embodiment shown in FIG. 7;

FIG. 9 is an enlarged vertical section taken substantially on line IX--IX of FIG. 8;

FIG. 10 is an enlarged vertical section taken substantially along line X--X of FIG. 7;

FIG. 11 is an exploded perspective view showing the second embodiment;

FIG. 12 is an exploded perspective view showing a third embodiment according to the present invention;

FIG. 13 is an enlarged plan view showing a portion of a conventional casing; and

FIG. 14 is an exploded perspective view showing the conventional casing.

Now, the present invention will be described in detail with reference to preferred embodiments illustrated in the accompanying drawings.

A first embodiment in accordance with the present invention will be explained in reference to FIGS. 1 through 6. The cartridge housing casing is constituted by an upper half 1 and a lower half 2 which are formed in two parts are assembled to be adapted to hold a cartridge a in the casing; an opening 3 for allowing the cartridge a to be inserted into the casing and to be withdrawn from it, which is arranged in one of the sides of the casing; and a holding portion 4 which is elastically engageable with a stepped or recessed portion b in the cartridge a to be housed. In the casing, the holding portion 4 is formed on and in at least of one of the halves, e.g. the lower half 2, to be integral with the one half (see FIG. 1).

In the first embodiment, the holding portion 4 is constituted by a projection which protrudes from an inner surface of a sidewall of the one half in a direction orthogonal to the direction of insertion and withdrawal of the cartridge a to exhibit a convex surface 4.sub.1 in a circular arc shape. It is convenient in terms of a smooth engagement operation that where R is defined to be the curvature of the convex surface, and d is extent by which the projection 4.sub.1 extends into the stepped or recessed portion b of the cartridge a (see FIG. 2), the curvature satisfies the following equation:

It is recommendable that the holding portion 4 is formed on and in one of the halves so as to be integral with it, the one half extending outwardly farther than the other half with respect to the portion where the holding portion 4 is engaged with the stepped or recessed portion b of the cartridge a (see FIG. 3).

In other words, although it is optional which one of engaged sidewall 1.sub.1 and 2.sub.1 of the upper and lower halves 1 and 2 should take an inner position, the holding portion 4 is formed on the half which has the side wall at an outer position, not on the side wall which is at an inner position in comparison with the other side wall in engagement. The upper and lower halves 1 and 2 are assembled together so that the opening 3 is defined in one side, and the side walls 1.sub.1 and 2.sub.1 at the other three sides are engaged together by ridge and groove connection 6. The halves have edges at the side of the opening 3 formed with cutout 13 so that one edge of the cartridge a can be exposed. This arrangement facilitates holding the cartridge (see FIGS. 4 and 5).

In the casing, a guide portion 5 is protrusively formed to present a sliding surface which is at the side opposite the holding portion 4 (see FIG. 1). The guide portion helps to bring the cartridge closer to the holding portion 4 and to maintain locking when the cartridge a has been inserted. In addition, it is effective that if necessary, the sidewall 1.sub.1 and 2.sub.1 and the upper and lower halves 1 and 2 have mating surfaces provided with such an engagement structure that both walls can slidably coupled at slide type ridge and groove portions 7 and 8 (see FIG. 6).

A second embodiment according to the present invention will be explained with reference to FIGS. 7 through 9. In the second embodiment, at least one of the upper and lower halves 1 and 2, e.g. the sidewall 1.sub.1 of the upper half, has a portion cut out at a position corresponding to the stepped or recessed portion b of the cartridge a which has been housed. The sidewall 1.sub.1 is the one that forms an inner side of the sides in engagement when both halves 1 and 2 are assembled together. Into the cut out portion, an arm 9 extends to be substantially parallel with the direction of insertion and withdrawal of the cartridge a. The arm 9 is connected to the side wall 1.sub.1 at the side of the opening 3 for insertion and withdrawal of the cartridge a to be integral with the sidewall 1.sub.1. It is preferable that the arm 9 projects from the side wall 1.sub.1 to slant toward the inside of the casing. The arm 9 has a leading edge provided with the holding portion 4 which is elastically engageable with the stepped portion b of the cartridge a. The holding portion 4 may be formed by curving the leading edge of the arm 9 so as to protrude toward the inside of the casing. When the cartridge a is inserted, the arm 9 is elastically deformed, causing the holding portion 4 on the leading edge to engage with the stepped portion b of the cartridge. The arm 9 has a spring function, and makes engagement of the holding portion 4 and the stepped portion b of the cartridge 45 firm. Another arm 9 with the holding portion can be arranged at an opposite side.

A third embodiment according to the present invention will be explained in reference to FIG. 12. In the third embodiment, the arm 9 extends into the cut out portion of the side wall 1.sub.1 to be substantially rectangular to the direction of insertion and withdrawal of the cartridge.