JPH11238345A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape cassette capable of stably retaining a lid lock even if an unexpected vibration, etc., occur. SOLUTION: This magnetic tape cassette comprises upper and lower halves, and is provided with a cassette case with an opening part in the front end, a reel housed in this cassette case to be freely rotatable and winding a magnetic tape thereon, a lid covering freely opening and closing the magnetic tape passing through the opening part, and a lid lock 1 which is attached to the lower half and locks the lid in the closing direction of the opening part. In this case, this is a magnetic tape cassette wherein the lower half 10 is provided with projecting parts 13; the lid lock is provided with recessed parts 1 to be press-fitted with the projecting parts 13; and the recessed part 7 is press-fitted with the projecting part 13 from above the lower half 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape cassette suitable for use in a video tape cassette or the like, and more particularly, to a magnetic tape provided with a lid lock for locking a lid for opening and closing a front end opening of a cassette case. It relates to a tape cassette.

[0002]

2. Description of the Related Art There are various types of conventional magnetic tape cassettes. For example, there is a magnetic tape cassette 60 for a DVC (digital video cassette) as shown in FIG.

As shown in FIG. 4, the magnetic tape cassette 60 has a pair of reels 62 and 63 composed of upper and lower flanges rotatably housed in a lower half 61 forming a cassette case half. , 63 are wound with a magnetic tape (not shown). Each reel 62, 63
Is composed of upper flanges 84 and 85 and lower flanges 70 and 71, and engagement teeth are formed on the entire periphery of the lower flanges 70 and 71. And the magnetic tape
The lower half 61 is guided by tape guides 65 and 66 on the left and right sides in front of the cassette (left side in FIG. 4).
Through the opening 67 on the front side.

[0004] An upper half 75 as the other half forming a cassette case together with the lower half 61 includes:
A lid 69 that covers the magnetic tape passing through an opening 67 in front of the cassette is attached to be openable and closable. The lid 69 includes three members, an outer lid 76, a top lid 77, and an inner lid 78.

A lock pin 80 protrudes from the inside of the side plate 79 of the outer lid 76. A lid lock 82 that locks the lock pin 80 and locks the lid 69 in the closing direction of the opening 67 is rotatably attached to the side plate portion 87 of the lower half 61. Further, a lid lock spring 83 that biases the lid lock 82 in the closing direction of the lid 69 is provided on the rear side of the cassette of the lid lock 82.

FIG. 5 is an enlarged perspective view showing the periphery of the side plate portion 87 of the lower half 61. As shown in FIG. 5, the lid lock 82 has support pins 8 protruding on both sides at its upper end.
2a is protruded. The support pin 82a is
7 is loosely fitted into a groove 61a formed at the upper end of the groove 7. When the lid lock 82 is loosely fitted, the upper half 75 is assembled from above the lower half 61, so that the lid lock 82 does not come off.

[0007]

However, since the lid lock 82 is mounted in the groove 61a in a loosely fitted state, if an unexpected vibration or the like occurs before the upper half 75 is assembled to the lower half 61, There was a case where the lid lock 82 dropped in front of the cassette (in the direction of arrow F). As a result, the dropped lid lock 82 must be picked up and reassembled to the lower half 61, so that the assemblability of the magnetic tape cassette cannot be improved. Therefore, an object of the present invention is to provide a magnetic tape cassette that can stably hold a lid lock even when unexpected vibration or the like occurs.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cassette case comprising upper and lower halves and having an opening at a front end, and a reel rotatably accommodated in the cassette case and wound with a magnetic tape. A magnetic tape cassette comprising: a lid that covers the magnetic tape passing through the opening so as to be openable and closable; and a lid lock attached to the lower half and locking the lid in a closing direction of the opening. The lower half is provided with a protrusion, and the lid lock is provided with a concave portion that is press-fitted into the protrusion and fitted therein, and the concave portion of the lid lock is formed from above the lower half. The problem is solved by providing a magnetic tape cassette characterized by being pressed into the projection.

According to the above configuration of the present invention, the recess provided in the lid lock is press-fitted and fitted to the pair of projections provided in the lower half, and the lid lock does not come out of the recess. Therefore, even if unexpected vibration or the like occurs before the upper half is assembled to the lower half, the lid lock can be stably held without dropping from the lower half. As a result, there is no need for the complicated work of picking up the lid lock and reassembling it to the lower half,
The assemblability of the magnetic tape cassette is improved. In addition, since the lid lock is press-fitted from above the lower half, it does not change in the mounting direction of the components housed in the lower half, and does not require a complicated operation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. Note that the configuration of the magnetic tape cassette is substantially the same as that of the related art, and a description thereof will be omitted. FIG. 1 is a perspective view of a lid lock 1 provided to a magnetic tape cassette according to one embodiment of the present invention.

[0011] As shown in FIG.
Locks the lid in the closing direction by locking the main body 3 and the lock pin of the outer lid, unlocks the first projection 5 bent upward on the cassette, and locks the lid, and opens and closes the lid The second projection 6 is engaged with a release pin to be brought into an enabled state. The main body 3 of the lid lock 1 includes:
A concave portion 7 having a bottomed notch is provided. At the entrance of the concave portion 7, a pair of convex portions 7a
Are formed facing each other. Note that a lid lock spring that biases the lid lock 1 in the lid closing direction is provided behind the lid lock 1.

FIG. 2 is an enlarged perspective view of a side portion of the lower half according to one embodiment of the present invention. As shown in FIG. 2, a pair of cylindrical protrusions 13 are provided on the inner surface of the side surface 11 of the lower half 10 so as to face each other.
The outer diameter of the projection 13 is set to be slightly smaller than the distance between the protrusions 7a for preventing the detachment. Therefore, the recess 7 of the lid lock 1 is pressed into the projection 13, and the lid lock 1 does not come out of the recess 7.

FIG. 3 shows a method for assembling the lid lock to the lower half. As shown in FIG. 3, in order to assemble the lid lock 1 to the lower half 10, first, a state where the inlet side of the concave portion 7 of the lid lock 1 is turned down is set. Then, the lid lock 1 is located above and substantially perpendicular to the lower half 10.
To the lower half 10. That is, the assembly is performed from the direction shown by the broken line C in FIG. Normally, the erroneous erasure prevention piece accommodated in the lower half, a reel lock member and many other parts are assembled from above the lower half when assembling to the lower half, but this lid lock assembling method is not different from many parts, Since it can be assembled from above the lower half, no complicated work is required.

Then, the recess 7 of the lid lock 1
Is pressed into the protrusion 13 by the protrusion 7a, and finally fits into the protrusion 7. Therefore, even if unexpected vibration or the like occurs before the upper half is assembled to the lower half 10, the convex portion 7a prevents the lid lock 1 from dropping off, so that the lid lock 1 does not drop.
As a result, since the lid lock 1 can be stably held, the complicated work of picking up the dropped lid lock 1 and assembling it on the lower half 11 is not required, and the assemblability of the magnetic tape cassette is improved.

It should be noted that the present invention is not limited to the above-described embodiment, but can be appropriately changed and improved based on the gist of the present invention. For example, the recess of the lid lock is not limited to the bottomed hole, but may be a through hole. Even in this case, if the entrance of the hole is smaller than the outer diameter of the projection of the lower half, the same effect as the above-described effect can be obtained.

[0016]

As described above, according to the present invention, the lower half constituting the cassette half is provided with a pair of projections, and the lid lock is pressed into the projections and fitted. Since the matching concave portion is provided, the lid lock does not come out of the concave portion. Therefore, even if unexpected vibration or the like occurs before the upper half is assembled to the lower half, the lid lock can be stably held without dropping from the lower half. As a result, there is no need for a complicated operation of picking up the lid lock and assembling the lid lock again, and the assemblability of the magnetic tape cassette is improved. In addition, since the lid lock is press-fitted from above the lower half, it does not change in the mounting direction of the components housed in the lower half, and does not require a complicated operation.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lid lock provided to a magnetic tape cassette according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a side plate portion of a lower half according to an embodiment of the present invention.

FIG. 3 shows a method of assembling a lid lock to a lower half.

FIG. 4 is an exploded perspective view of a conventional magnetic tape cassette.

FIG. 5 shows a method of assembling a conventional lid lock to a lower half.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid lock 3 Main body 5 1st projection part 6 2nd projection part 7 recessed part 7a convex part 10 Lower half 11 Side plate part 13 Projection part

Claims (1)

[Claims] 1. A cassette case comprising upper and lower halves and having an opening at a front end, a reel rotatably housed in the cassette case and winding a magnetic tape, and the magnetic tape passing through the opening And a lid attached to the lower half to lock the lid in the closing direction of the opening, wherein the lower half is provided with a projection. The lid lock is provided with a concave portion that is press-fitted into and fitted to the protrusion, and the concave portion of the lid lock is press-fitted into the protrusion from above the lower half. Tape cassette.