JPH0424545Y2 - - 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. 5 and 6, 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 main body 4, and a coil spring 10 externally fitted on the support shaft of the front lid locking member 9 keeps the front lid locking member 9 in the closed direction. The front cover 8 is held in a closed state by pressing the front cover 8.

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,
The spring that holds the front cover in the closed state is a flat spring bent at an acute angle or a roughly U-shaped wire spring bent at an acute angle, and this spring is attached to the tip of a support that is erected on the lower half. The one inserted into the spring insertion hole facing toward the lower half is the one inserted in the spring from 1983-14958.
It is disclosed in the publication No.

[The problem that the idea attempts to solve]

However, this spring has a plate spring bent at an acute angle that is inserted into a spring insertion hole, with a locking piece formed to prevent it from coming out, or a wire spring that is bent at an acute angle and has both ends inserted. The spring is inserted into the hole and the bent part is held between the tip of the column and the upper half, which improves assembly work, but it is troublesome to manufacture the spring, and in the case of a leaf spring, it is difficult to insert the spring into the column. Since it is attached to the hole with only a locking piece, there is a risk of it falling off if a strong impact is applied, such as by dropping it.In the case of a wire spring, the bent part is held between the tip of the column and the upper half, so there is a risk of it falling off. The elastic force of the bent portion could not be used effectively.

Therefore, the present invention provides 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 It is an object of the present invention to provide a magnetic tape cassette that can effectively utilize the elastic force of the bent portion and is easy to assemble.

[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, the magnetic tape cassette is provided with a spring that is rotatable and that always biases the front lid locking member in the closing direction to hold the front lid in a closed state, wherein the spring is formed in an L-shape. , a spring insertion hole extending from the tip toward the lower half is formed in the upright pillar of the lower half, and a notch is formed at the tip, and a piece of the L-shaped spring is inserted into the spring insertion hole. Then, the base of the other piece of the spring is engaged with the notch, the tip of the boss of the upper half is brought into contact with the tip of the support column to prevent the spring from coming out, and the tip of the other piece is inserted into the front It is characterized in that the lid locking member is pressed into contact with a protrusion formed at approximately the same height as the tip of the support column.

〔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 support post 16 is erected on the inner surface of the lower half 12, and a spring insertion hole 16a is formed from the tip of the support post 16 toward the lower half 12, and the front cover is engaged with the spring insertion hole 16a at the tip. A groove-shaped notch 16b facing the member 15 side is formed.
A projecting piece 15c is formed on the front lid locking member 15 at approximately the same height as the tip of the support column 16.

A spring 17 is attached to the support column 16. This spring 17 is a wire spring formed in an L shape.

This spring 17 has an L-shaped piece 17a.
is inserted into the spring insertion hole 16a, and the base 17c of the other piece 17b is inserted into the groove-shaped notch 16b to prevent rotation.
The tip of the boss portion 18 of the upper half 11 is brought into contact with the tip of the support column 16 to prevent the spring 17 from coming out, and the tip 17d of the other piece 17b is connected to the protruding piece of the front lid locking member 15. 15c, and urges the front lid locking member 15 to lock the front lid 14 in the closed state.

The embodiment shown in FIGS. 3 and 4 uses a plate-shaped spring 17 bent in an L-shape instead of the linear spring 17.
One piece 17a shaped like a letter is inserted into a spring insertion hole 16a formed in a direction parallel to the front lid locking member 15, and the base 17c of the other piece 17b is engaged with the notch 16b.
A boss portion 18 of the upper half 11 is attached to the tip of the pillar 16.
The front end 17d of the other piece 17b is pressed against the projection 15c of the front lid locking member 15, so that the front lid locking member 15 closes the front lid 14. It is biased to lock in the state.

With this configuration, the spring 17
Manufacture is simple because it is only necessary to bend a linear or plate-shaped spring material into an L-shape, and the assembly work is performed by inserting an L-shaped piece 17a into the spring insertion hole 16a. It is only necessary to engage the base 17c of the other piece 17b with the notch 16b and contact the tip of the boss portion 18 of the upper half 11 with the tip of the support 16 to prevent the spring 17 from coming out. It does not fall off even when bent, and the elastic force of the bent portion can be used effectively, making assembly work easier and reducing costs.

[Effect of idea]

As described above, the present invention has an L-shaped spring that always biases the front lid locking member in the closing direction and holds the front lid in the closed state, and the spring that holds the front lid in the closed state is formed in the L-shape, and
A spring insertion hole is formed from the tip toward the lower half, and a notch is formed at the tip, one piece of the L-shaped spring is inserted into the spring insertion hole, and the base of the other piece of the spring is inserted into the spring insertion hole. The tip of the boss portion of the upper half is engaged with the notch, and the tip of the boss portion of the upper half is brought into contact with the tip of the column to prevent the spring from coming out, and the tip of the other piece is attached to the front lid locking member at approximately the same height as the tip of the column. Since the spring material is pressed into contact with the protruding piece formed in the spring, manufacturing is simple because it is only necessary to bend the spring material into an L-shape. All you have to do is engage the base of the piece with the notch and touch the tip of the boss part of the upper half to the tip of the column to prevent the spring from coming off, so it will not fall off even if there is a strong impact such as falling. Since the bent portion of the spring is not clamped, the elastic force of the bent portion of the spring can be used effectively, making assembly work easier and reducing costs.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention,
1 is a plan view of the front lid locking member, FIG. 2 is a sectional view taken from FIG. 1, FIG. 3 is a plan view of the front lid locking member, and FIG. 4 is a sectional view taken from FIG. 3, FIG. 5 is a plan view of a conventional videotape cassette, and FIG. 6 is a sectional view taken along the line shown in FIG. 11... Upper half, 12... Lower half, 13...
...Cassette body, 14...Front cover, 15...Front cover locking member, 15c...Protrusion piece, 16...Strut, 16a
... Spring insertion hole, 16b ... Notch, 17 ... Spring, 17a ... One piece, 17b ... Other piece, 17c ...
...base, 17d...tip, 18...boss part.

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 the 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, the spring 17 is formed into an L-shape, and the support column 16 erected on the lower half 12
A spring insertion hole 16a extending from the tip toward the lower half 12 is formed, and a notch 16b is formed at the tip, and a piece 17a of the L-shaped spring 17 is inserted into the spring insertion hole 16a. The base 17c of the other piece 17b of the spring 17 is engaged with the notch 16b, and the tip of the boss portion 18 of the upper half 11 is brought into contact with the tip of the support 16 to prevent the spring 17 from coming off;
A magnetic tape cassette characterized in that a tip 17d of the other piece 17b is pressed against a protruding piece 15c formed on the front lid locking member 15 at approximately the same height as the tip of the column 16.