JPH11250612A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape cassette which can maintain a lid lock at the adequate position. SOLUTION: In a magnetic tape cassette comprising a cassette case consisting of upper and lower halves, a reel accommodated in the cassette case in a state where it is biased toward the lower half side by leaf springs 5a, 5b to wind up the magnetic tape, a lid covering the magnetic tape passing through an aperture and a lid lock in which projections provided at both ends are removably fit in the groove in the lower half to lock the lid in the direction where the aperture is closed, there are also provided on the upper half 1 stopper ribs 7a, 7b, which regulate, on the occasion of conducting threading in the condition that the lower half is engaged with the upper half 1 and lower half is located at the upper position by inverting the cassette, the projection of lid lock to the position which can be reset to the groove in the lower half.

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. 5, a pair of reels 62 and 63 composed of upper and lower flanges are 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. Then, the reel 62,
63 is urged toward the lower half 61 by leaf springs 51 and 52. The magnetic tape is provided at the tape guides 6 at the front of the cassette (left side in FIG. 5) and at both left and right sides.
The lower half 61 passes through an opening 67 on the front side of the lower half 61.

[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 the opening 67 at the front end 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. 6 is an enlarged perspective view of the periphery of the side plate portion 87 of the lower half 61. As shown in FIG. 6, the lid lock 82 has a projection 82 projecting to both sides at an upper end thereof.
a is protrudingly provided. The protruding portion 82a is connected to the side plate portion 8.
7 is loosely fitted into a groove 61a formed at the upper end of the groove 7.

Then, with the lid lock 82 attached in a loosely fitted state, the upper half 75 is assembled to the lower half 61, and then the cassette case is turned over to lower the lower half 6
The screw 90 shown in FIG. 1 is tightened with a screwdriver or the like in a state where 1 is turned up, and the assembly is completed. Here, lower half 61
The opening of the groove 61a is closed by the upper half 75, so that the lid lock 82 does not come off.

[0008]

However, the lower half 61 floats due to the urging force of the leaf spring 51 until the screw is screwed. Here, since the protrusion 82a of the lid lock 82 is loosely fitted in the groove 61a, the lid lock 82 may come off from the groove 61a. The present invention has been made based on the above background, and an object of the present invention is to provide a magnetic tape cassette capable of maintaining a lid lock at an appropriate position.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to provide a cassette case comprising upper and lower halves and having an opening at the front end, and a cassette which is urged toward the lower half by a leaf spring. A reel that is rotatably housed and winds the magnetic tape, a lid that opens and closes the magnetic tape that passes through the opening, and protrusions provided at both ends are provided in grooves provided in the lower half. A magnetic tape cassette having a lid lock mounted in a loosely fitted state and locking the lid in a direction in which the opening is closed, by assembling the upper half with the lower half, inverting the cassette case and lowering the lower half. When screwing is performed with the upper side up, the stopper rib that regulates the protrusion of the lid lock to a position where it can return to the groove of the lower half is provided with the upper c. It is solved by a magnetic tape cassette, characterized in that provided in the off.

According to the magnetic tape cassette of the present invention, when the upper half is assembled to the lower half, the cassette case is turned over, and when the lower half is screwed up with the lower half upward, the lower half is attached to the lower half by a leaf spring. Even if the force is applied, the stopper rib provided on the upper half regulates the lid lock at a position where the projection of the lid lock can return to the groove of the lower half. Therefore, even if the protrusion of the lid lock slightly comes out of the groove of the lower half, it can be returned to the groove and can be maintained at an appropriate position, so that the assemblability of the magnetic tape cassette can be improved. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. The description of the same configuration of the magnetic tape cassette as that of the related art is omitted. FIG. 1A shows a side view of an upper half 1 of a magnetic tape cassette according to an embodiment of the present invention, and FIG. 1B shows an inner view thereof.

As shown in FIGS. 1A and 1B, the upper half 1 has a substantially rectangular shape. The upper half 1 is provided with projections 2a and 2b on the front side, projections 3a and 3b on the rear side, and a projection 4 substantially at the center, and each projection has a hollow cylindrical shape. The upper half 1 has a pair of leaf springs 5a and 5b for urging the reel toward the lower half.
Is attached.

In addition, concave portions 6a and 6b are provided on both side plates of the upper half 1 to accommodate the upper end of the lid lock. The recesses 6a, 6b have stopper ribs 7a, which restrict the position of a lid lock 30, which will be described later.
7b is provided. The stopper ribs 7a,
The position 7b does not interfere with the sliding area of the lid lock and the installation area of the lid lock spring.

FIG. 2A is a side view of the lower half 10 of the magnetic tape cassette according to one embodiment of the present invention, and FIG.
Figure 2 shows the inside view. As shown in FIGS. 2A and 2B, the lower half 10 has a rectangular shape like the upper half 1. The lower half 10 has a hole 12a
12b, holes 13a and 13b on the rear side, and hole 1
4 are provided, and each hole has a hollow cylindrical shape.

The front projections 2a and 2b, the rear projections 3a and 3b, and the substantially central projection 4 provided on the upper half 1 are respectively provided on the front half provided on the lower half. Holes 12a and 12b, rear holes 13a and 13
b, corresponding to the substantially central hole portion 14, screwing is performed using a screw or the like. Also, on both side plate portions of the lower half 10,
Protrusions 33 projecting from both sides of a lid lock 30 described later
Are provided with grooves 16a and 16b, which are mounted in a loosely fitted state.

Next, a method of assembling the above-described magnetic tape cassette will be described. First, reel on the lower half 10,
The lid lock 30 and other various parts are stored. Next, the upper half with the lid attached is assembled to the lower half. Then, as shown in FIG. 3 (the lid is not shown), the upper half 1 and the lower half 10 are assembled.

Thereafter, as shown in FIG. 4, screwing is performed using a screw with the cassette case turned upside down and the lower half 10 turned up. Here, the leaf springs 5a and 5b attached to the upper half 1 apply an urging force to the lower half 10 side, so that the lower half 10 floats and a gap t is generated between the upper half 1 and the lower half 10. However, the stopper ribs 7a and 7b provided on the upper half 1
The position of the upper end 30a of the lid lock 30 is regulated, and the lid lock 30 is supported at two points together with the side walls 18a and 18b provided on the lower half 10. Then, the pair of protrusions 33 of the lid lock 30 are connected to the grooves 1 of the lower half 10.
Since it is restricted to a position where it can be completely returned from 6a and 16b, it can be returned into the grooves 16a and 16b. As a result, since the lid lock can be maintained at an appropriate position, the assemblability of the magnetic tape cassette can be improved.

The present invention is not limited to the above-described embodiment, but can be appropriately modified and improved based on the gist of the present invention. For example, the magnetic tape cassette of the present invention is not limited to DVC, but is applicable to various cassettes. Also, when the lid lock shape is changed,
Accordingly, it is necessary to appropriately change the shape, position, and the like of the stopper rib.

[0019]

As described above, according to the present invention, when the upper half is assembled to the lower half and the cassette case is turned upside down and the lower half is screwed up with the lower half raised, the projection of the lid lock is formed. Is provided on the upper half, and a biasing force is applied to the lower half by a leaf spring, so that the protrusion of the lid lock is Even if it comes out of the groove of the lower half to some extent, it can be returned into the groove and can be maintained at an appropriate position, so that the assemblability of the magnetic tape cassette can be improved.

[Brief description of the drawings]

FIG. 1A is a side view of an upper half of a magnetic tape cassette according to an embodiment of the present invention, and FIG.
FIG.

FIG. 2A is a side view of a lower half of a magnetic tape cassette according to an embodiment of the present invention, and FIG. 2B is a side view of FIG.
FIG.

FIG. 3 is a partial cross-sectional view showing a state where upper and lower halves are combined.

FIG. 4 is a partial cross-sectional view of a state where the upper and lower halves are inverted.

FIG. 5 is an exploded perspective view of a conventional magnetic tape cassette.

FIG. 6 is an enlarged perspective view of the vicinity of a side plate portion 87 of the lower half 61;

[Explanation of symbols]

 1 Upper half 5a, 5b Leaf spring 7a, 7b Stopper rib 10 Lower half 16a, 16b Groove 30 Lid lock 30a Upper end 33 Projection

Claims (1)

[Claims] 1. A cassette case comprising upper and lower halves and having an opening at a front end, and rotatably housed in the cassette case while being urged toward the lower half by a leaf spring, and wound with a magnetic tape. A lid that covers the magnetic tape passing through the opening so as to be openable and closable, and protrusions provided on both ends are loosely attached to grooves provided in the lower half, and the lid is attached to the lid. A magnetic tape cassette provided with a lid lock for locking the opening in the closing direction, wherein the upper half is assembled to the lower half, the cassette case is turned over, and screwing is performed in a state where the lower half is turned up. A stopper rib for regulating the protrusion of the lid lock to a position where the protrusion can return to the groove of the lower half is provided on the upper half. Magnetic tape cassette that.