JPH0424544Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic tape cassette such as a video cassette tape.

[Conventional technology]

As shown in FIGS. 3 and 4, for example,
A magnetic tape cassette 1 used in a VTR (video) device has an upper half 2 and a lower half 3 forming a cassette body 4, and a supply reel 6 and a take-up reel 7 of a magnetic tape 5 are housed in the cassette body 4. At the same time, in order to protect the magnetic tape 5 fed out to the front of the cassette main body 4, a front cover 8 covering the magnetic tape 5 is provided on the front of the cassette main body 4 so as to be openable and closable, and the front cover 8 can be closed when not in use. A front lid locking member 9 is provided inside the cassette body 4, and the front lid locking member 9 is always closed by a coil spring 10 made of a wire fitted externally to the support shaft of the front lid locking member 9. The front lid 8 is held in a closed state by being biased in this direction.

The front cover locking member 9 includes an engagement protrusion 9a that engages the front cover 8, and a release protrusion that releases the engagement between the engagement protrusion 9a and the front cover 8 when pushed by a working claw of the VTR device. 9b, and is biased by the coil spring 10 to connect the engaging protrusion 9a and the releasing protrusion 9b.
protrudes outward from the cassette main body 4, and locks the front lid 8 with an engaging protrusion 9a.

However, in this magnetic tape cassette 1, the spring that always biases the front lid locking member 9 in the closing direction and holds the front lid 8 in the closed state is a coil spring 10 made of a wire material, so it is difficult to manufacture it. Assembly work was time consuming.

On the other hand, the front lid locking member is always biased in the closing direction,
A bent leaf spring was used as the spring to hold the front cover in the closed state, and this leaf spring was engaged with the tip of a support column erected on the lower half 3.
It is disclosed in the publication No.

[The problem that the idea aims to solve]

However, this leaf spring has a substantially V-shape in which spring pieces are bent on both sides of a flat part that has a through hole in the center that engages with the tip of the support, and the flat part has a hole that engages with the tip of the support. Although the assembling work was improved because it was formed into a single piece, it was troublesome to manufacture the leaf spring, and there was only a locking piece at the tip of the post.
Since it is attached, there is a risk that it will fall off if a strong impact is applied, such as by dropping it.

Therefore, the present invention aims to create a spring that always biases the front lid locking member in the closing direction and holds the front lid in the closed state, which is easy to manufacture, does not fall off even when subjected to a strong impact such as a fall, and is assembled. The object of the present invention is to provide a magnetic tape cassette that is easy to attach.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a front cover that covers the magnetic tape so that it can be opened and closed on the front surface of a cassette body consisting of an upper half and a lower half, and a front cover locking member that locks the front cover in a closed state. In the magnetic tape cassette, a magnetic tape cassette is provided with a plate spring that is rotatable and that always biases the front cover locking member in the closing direction to hold the front cover in the closed state. The leaf spring is engaged with the tip of a column installed in the lower half, and is held between the tip of the column and the tip of the boss portion of the upper half, and the rear end of the plate spring is The plate spring is held between the ribs of the upper half and the ribs of the lower half, and the tip of the leaf spring is pressed into contact with the protrusion formed on the front lid locking member at approximately the same height as the tip of the support. It is said that

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

A front lid 14 is provided on the front surface of the cassette body 13, which is constructed by combining an upper half 11 and a lower half 12, so as to be openable and closable, and the front lid 14 is locked to the lower half 12 in a closed state. A front lid locking member 15 is provided. The front lid locking member 15 has an engaging protrusion 15a that locks the front lid 14 and a releasing protrusion 15b. It stands out.

A column 16 is erected on the inner surface of the lower half 12, and an engaging protrusion 16a projects from the tip of the column 16. The front lid locking member 15 has a protruding piece 1.
5c is formed at approximately the same height as the engagement protrusion 16a of the support column 16.

The plate spring 1 is attached to the engagement protrusion 16a of the support column 16.
7 is engaged. This plate spring 17 is formed into a single-letter-shaped flat plate, and has an engaging protrusion 16 on the rear end side.
A through hole 17a that engages with the hole 17a is bored.

The plate spring 17 engages the through hole 17a with the engagement protrusion 16a of the column 16, and the upper half 11 assembled to the tip of the column 16 and the upper part of the column 16.
The rear end 17b of the leaf spring 17 is engaged with the groove 19a of the rib 19 provided upright on the lower half 12 to prevent rotation, and the upper half 11 is Rib 20 and lower half 12
The tip 17c of the leaf spring 17 is held between the ribs 19 of
is pressed against the protruding piece 15c of the front lid locking member 15, thereby urging the front lid locking member 15 to lock the front lid 14 in the closed state.

To prevent the leaf spring 17 from rotating, engagement protrusions 16a may be provided on both sides of the support post 16 so that both sides of the leaf spring 17 come into contact with each other, or the protrusions on the support post 16 may be made square and The through hole 17a may be a square hole.

With this configuration, the leaf spring 17
Since it is only necessary to form the through hole 17a in a single-character-shaped flat plate, manufacturing is easy, and the assembly work is also easy by attaching the plate spring 17 to the engagement protrusion 16a of the support column 16.
It is only necessary to engage the struts 16 of the lower half 12 and the boss portions 18 of the upper half 11, and to clamp them between the ribs 19 of the lower half 12 and the ribs 20 of the upper half 11, so that they can be protected from strong impacts such as those caused by drops. It does not fall off even when attached, making assembly work easier and reducing costs.

[Effect of idea]

As described above, the present invention biases the front lid locking member toward the front lid, forms the leaf spring that holds the front lid in the closed state into a single-letter-shaped flat plate, and makes the leaf spring stand upright on the lower half. At the same time, the rear end of the leaf spring is held between the rib of the upper half and the rib of the lower half, and the Since the tip of the leaf spring was pressed into contact with the front lid locking member and the protrusion formed at approximately the same height as the tip of the pillar, the leaf spring was made into a single letter-shaped flat plate with the engagement part with the pillar. All you have to do is form it.
It is easy to manufacture, and since all you have to do is engage the leaf spring at the end of the support and hold it between the support and ribs on the lower half and the boss and ribs on the upper half, it will not be damaged by strong impacts such as falls. It does not fall off even when attached, making assembly work easier and reducing costs.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention. Figure 1 is a partial cross-sectional plan view of the main part with the upper half removed, and Figure 2 is a cross-sectional view of the main part of Figure 1. 3 is a partial cross-sectional plan view of a conventional video cassette, and FIG. 4 is a cross-sectional view taken from FIG. 11... Upper half, 12... Lower half, 13...
...Cassette body, 14...Front cover, 15...Front cover locking member, 15c...Protrusion piece, 16...Strut, 16a
...Engagement protrusion, 17...Plate spring, 17a...Through hole, 17b...Rear end, 17c...Tip, 18...
Boss part, 19, 20...rib.

Claims (1)

[Scope of utility model registration request] A front cover 1 covering the magnetic tape 5 is provided on the front of the cassette body 13 consisting of an upper half 11 and a lower half 12.
4 is provided so that it can be opened and closed, and a front lid locking member 15 that locks the front lid 14 in a closed state is rotatably provided, and the front lid locking member 15 is normally biased in the closing direction to lock the front lid 14 in the closed state. Lid 1
In the magnetic tape cassette 1 provided with a leaf spring 17 for holding the lower half 12 in a closed state, the leaf spring 17 is formed into a flat plate in the shape of a single character, and the leaf spring 17 is attached to the tip of a support 16 erected on the lower half 12. engage,
The tip of the support column 16 and the boss portion 1 of the upper half 11
At the same time, the rear end 17b of the leaf spring 17 is held between the rib 20 of the upper half 11 and the rib 19 of the lower half 12.
The tip 17c of the front lid locking member 15 is provided with a protruding piece 15c formed at approximately the same height as the tip of the support column 16.
A magnetic tape cassette characterized in that it is pressed into contact with the magnetic tape cassette.