JPH0356930Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is ideal for application to tape cassettes for video tape recorders, for example, and is suitable for use in tapes stretched along the front opening of the cassette housing. The present invention relates to a tape cassette whose front and rear sides are covered by a front cover and a rear cover.

[Summary of the idea]

In this invention, the tape stored in the cassette housing is stretched along the front opening of the cassette housing.
The front cover, which is integrally formed with a front cover plate and an upper cover plate to have an approximately L-shaped cross section, can be freely rotated to the cassette casing by a pair of left and right first fulcrum pins provided behind the front cover plate that covers the front side of the tape. A pair of left and right secondary covers are installed on the left and right edges of the tape, and rear covers covering the rear side of the tape are provided on both left and right edges.
It is rotatably attached by a fulcrum pin between a pair of left and right protrusions that are integrally molded at intervals on the lower surface of the upper cover plate of the front cover, and guides a pair of left and right guide pins provided on both left and right edges of the rear cover. A pair of left and right guide grooves are provided on the cassette housing, and an integrally molded dustproof rib is provided along the lower surface of the upper cover plate of the front cover, and when the cover is closed, the guide groove extends rearward and upward from the pair of left and right second fulcrum pins. The top edge of the lid is brought into contact with the bottom edge of the dustproof rib from the front side, and the front and rear sides of the tape are completely sealed and dust-proofed by the front and rear lids, and the front lid is opened. When rotating in the direction of the lid, the rear lid, which rotates together with the front lid by a pair of left and right second fulcrum pins, is guided by a pair of left and right guide pins through a pair of left and right guide grooves, so that the rear lid is aligned with the front lid. In a tape cassette in which the lid is moved backward and then rotated together with the front lid in the direction of opening the lid, a dustproof rib is arranged between the pair of left and right protrusions at a position above the pair of left and right second fulcrum pins. By integrally molding the bases of the pair of left and right protrusions with the upper cover plate of the front cover, even if the front cover and the cassette housing are deformed due to molding distortion or aging, the front This prevents the dustproof ribs on the front cover from coming into contact with the cassette housing during the opening of the lid and rear cover, and also prevents the pair of left and right protrusions from being accidentally damaged by impact force such as when dropped. be.

[Conventional technology]

First, a conventional example of a tape cassette for a video tape recorder will be explained with reference to FIGS. 3 to 5.

In FIG. 3, the cassette housing 1 includes upper and lower halves 2, which are integrally molded of synthetic resin, etc.
3 are connected to each other from above and below. A pair of left and right reels 5 wound with tape 4 are rotatably housed in the cassette casing 1. A front opening 6 is provided in the front of the cassette housing 1, and the tape 4 is guided by a pair of left and right tape guides 7 arranged on the left and right sides of the front opening 6, and the tape 4 is guided through the front opening 6 as shown in FIG. It spans along 6. Further, a recess 8 is formed on the rear side of the front opening 6 and is open at both the upper and lower sides. It is partitioned off from the storage section side of both reels 5 in the cassette housing 1.

Next, the front lid 11 is integrally molded from synthetic resin or the like, and has a substantially U-shaped planar shape as shown in FIG.
2 and the upper cover plate 13 form a substantially L-shaped cross section. A pair of left and right first fulcrum pins 14 are integrally formed on both left and right ends 11a of the front cover 11 behind the front cover plate 12 and on the same axis. The pair of first fulcrum pins 14 are sandwiched from above and below by left and right vertical walls 15 that are integrally molded on the left and right sides of the front end sides of the upper and lower halves 2 and 3, so that the front wall 11 is It is attached to the cassette housing 1 so as to be freely rotatable up and down around . Therefore, as shown in FIG. 4, the front side and the upper end side of the tape 4 stretched along the front opening 6 are respectively covered by the front cover plate 12 and the upper cover plate 13 of the front cover 11. At the same time, the upper part of the recess 8 is also covered by an upper cover plate 13.

Next, the rear lid 17 is molded from synthetic resin or the like, and a pair of left and right second fulcrum pins 18 are integrally molded on both left and right edges of the rear lid 17 at positions closer to the upper side so as to be coaxial with each other. As shown in FIG. 4, the rear cover 17 is disposed in the recess 8 in parallel with the front cover 11, and the rear side of the tape 4 is covered by the rear cover 17. In addition, on the lower surface of the upper cover plate 13 of the upper cover 11, a pair of left and right protrusions 1 are provided at intervals in the longitudinal direction.
9 is integrally molded. The rear lid 17 is pivotally supported by inserting the pair of second fulcrum pins 18 into a pair of pin insertion holes 20 provided in the pair of projections 19 of the front lid 11. the second of
The front cover 11 is rotatable up and down about the fulcrum pin 18.
installed on. The first of the pair of lids 11
A dust-proofing rib 21 that is linear along the lower surface of the upper cover plate 13 is integrally formed at an intermediate portion between the fulcrum pin 14 and the pair of projecting pieces 19 in the front-rear direction. Further, the upper edge 17a of the rear lid 17 extends rearward and upward from the pair of second fulcrum pins 18.

Next, as shown in FIGS. 3 and 4, the left and right ends 9a of the partition wall 9 are opposed in parallel,
A pair of left and right guide grooves 23 that are gently bent into a substantially C shape are provided on opposing surfaces of the left and right end portions 9a. A pair of left and right protrusions 24 are integrally molded below the pair of second fulcrum pins 18 on the rear surface of both left and right edges of the rear cover 17, and are integrally formed on the outside of the pair of protrusions 24 on the same axis. A pair of molded left and right guide pins 25 are connected to a pair of guide grooves 2.
It is loosely fitted in 3. The cover 11 has a torsion coil spring 26 wound around a pair of first fulcrum pins 14.
It is configured to be rotated in the direction of closing the lid, which is the direction of arrow a in FIG. 4, and to be locked by a lock lever (not shown) in the closing position.

In the conventional tape cassette configured as described above, first, when the cassette is not in use, the front cover 1 is closed.
1 is locked in the closed state as shown by the solid line in FIG. In this closed state, the rear lid 17
The lower edge 17b abuts the lower edge 11b of the front cover 11 from the rear side, and the upper edge 17 of the rear cover 17
a is in contact with the lower end edge 21a of the dustproof rib 21 from the front side. As a result, the tape 4 stretched along the front opening 6 is connected to the front lid 11 and the rear lid 1.
7 so as to be wrapped from the front and back, making it a so-called completely sealed and dust-proof tape cassette.

Next, when the tape cassette is installed in the video tape recorder, the front cover 11 is unlocked and the front cover 11 is attached to the pair of first fulcrum pins 14.
The lid is rotated approximately 90 degrees in the direction of arrow a' from the closed position shown by the solid line to the opened position shown by the dashed-dotted line in Fig. 4, with
The front opening 6 is closed. In conjunction with the rotation of the front lid 11, the pair of second fulcrum pins 18 of the rear lid 17 are also rotated in the same direction and at the same angle. rotated into position. At this time, by rotating the pair of second fulcrum pins 18 in the direction of arrow a', the pair of guide pins 25 are guided by the pair of guide grooves 23 and moved in the direction of arrow b', The pair of guide grooves 23
Due to the guiding action of the rear cover 17, the second
The lid is opened in the direction of arrow a' while being rotated about the fulcrum pin 18 with respect to the front lid 11 in the direction of arrow c', that is, in the direction of moving away from the front lid 11 to the rear. In addition, when the lid is closed, the front lid 11 is moved by the arrow a by the reverse operation when the lid is opened.
As the rear cover 17 is rotated in the direction of the arrow c, the rear cover 17 is rotated in the direction of the arrow a with respect to the front cover 11.
The pair of guide pins 25 are also moved in the direction of arrow b within the pair of guide grooves 23 and returned to the lower ends of the pair of guide grooves 23.

[Problem that the invention attempts to solve]

However, the conventional tape cassette described above has the following problems.

That is, since the cassette housing 1, front cover 11, etc. of this type of tape cassette are injection molded from synthetic resin or the like, they are susceptible to deformation due to molding distortion or aging. In particular, since the front cover 11 is long in the left-right direction as shown in FIG. 3, the front cover plate 12 and the upper cover plate 13 are easily bent (warped) in the direction of arrow d, which is a direction perpendicular to the left-right direction. Also, cassette housing 1
When the tape cassette is installed in the video tape recorder,
Heat generated from the recorder tends to stay there, and for this reason, the vicinity of the front corner 2a of the upper half 2 tends to bulge upward in the direction of arrow e, as shown in FIG.

By the way, as shown in FIG. 5, when the front cover 11 and the rear cover 17 are opened in the direction of arrow a', the upper cover plate 13
The dustproof rib 21 provided on the lower surface of the upper half 2
It runs over the upper half 2 along the front corner 2a of the upper half 2. In the middle of opening the lid, the dustproof rib 21 is connected to the pair of first fulcrum pins 14 of the front lid 11.
and the pair of protrusions 19 in the longitudinal direction, so that the dustproof rib 21 and the upper half 2
The gap _l1 between the front corner 2a and the front corner 2a is extremely small. For this reason, the upper cover plate 13 of the front cover 11 is bent as shown by the dashed line, and the front corner portion 2 of the upper half 2 is bent.
If a bulges out, the dustproof rib 21 of the upper lid plate 13 and the front corner 2a of the upper half 2 will come into contact with each other during the opening of the lid. As a result, the dustproof rib 21 and the front corner 2a remain in contact with each other, causing the front lid 11 and the rear lid 17 to become impossible to open halfway.

Furthermore, while handling a tape cassette, it is common for people to accidentally drop the tape cassette, giving it a shock. In this case, the front lid 11 of the tape cassette is locked in the closed position, and the rear lid 17 is also locked in conjunction with the locking of the front lid 11, so that the impact force due to a fall or the like is absorbed by the pair of rear lids 17. A pair of projecting pieces 1 of the front cover 11 on which the second fulcrum pin 18 of the front lid 11 is pivotally supported.
Focus on 9. Since the pair of protrusions 19 are simply integrally formed on the lower surface of the upper cover plate 13 of the front cover 11, they are easily broken and damaged at the base 19a, which is the root of the upper cover plate 13. Ta.

Therefore, in the present invention, even if the front cover and the cassette casing are deformed due to molding distortion or aging, the dustproof ribs on the front cover and the cassette casing can be removed while the front and rear lids are being opened. This prevents them from coming into contact with each other, and also prevents the pair of left and right protrusions from being accidentally damaged by impact force such as when dropped.

[Means for solving problems]

The present invention provides the above-mentioned tape cassette.
The dustproof rib is arranged between the pair of left and right protrusions at a position above the pair of left and right second fulcrum pins, and is integrally molded on the bases of the pair of left and right protrusions and the upper cover plate of the front lid. and in a closed state, the upper end edge of the rear cover extends forward and upward from the pair of left and right second fulcrum pins, and is configured to abut the lower end edge of the dustproof rib from the front side.

[Effect]

In this invention, the dustproof rib is the first of the pair of left and right of the front cover.
Since the fulcrum pin is placed at a position sufficiently spaced forward from the fulcrum pin, even if the front cover and the cassette housing are deformed due to molding distortion or aging, the front cover and rear cover will not open. A sufficient gap can be ensured between the dustproof rib of the front lid and the cassette casing in the middle of the lid, and contact between them can be avoided.

In addition, the dustproof ribs that are integrally formed on the bases of the left and right pair of protrusions on the front cover and the top cover plate double as reinforcing ribs that reinforce the bases of the left and right pair of protrusions to make them extremely strong. This can prevent the pair of left and right projecting pieces from being accidentally damaged by the impact force.

〔Example〕

An embodiment in which the present invention is applied to a tape cassette for a video tape recorder is shown in Figs. 1 and 2 below.
This will be explained based on the diagram. In addition, the above-mentioned [prior art]
Components that are the same as those in the conventional example described in section 2 will be designated by the same reference numerals, and their explanation will be omitted.

That is, in the present invention, a straight dustproof rib 30 is disposed above the pair of second fulcrum pins 18 of the rear lid 17 and between the pair of protrusions 19 of the front lid 11. The dustproof rib 30 is integrally formed on the base portion 19a of the pair of protrusions 19 and the upper cover plate 13 of the front cover 11. On the other hand, the rear lid 17
The upper end edge 17a extends forward and upward from the pair of second fulcrum pins 18. As shown by the solid line in FIG. 1, when the front lid 11 and the rear lid 17 are in the closed state, the upper edge 17a of the rear lid 17 is brought into contact with the lower edge 30a of the dustproof rib 30 from the front side. It is configured.

According to the tape cassette of the present invention constructed as described above, the front cover 11 is closed as shown by the solid line in FIG.
In the closed state of the rear lid 17, the lower edge 17b of the rear lid 17 abuts the lower edge 11b of the front lid 11 from the rear side, and the upper edge 17a of the rear lid 17 contacts the lower edge of the dustproof rib 30. 30a from the front side, the tape 4 closes the front cover 11 and the rear cover 17.
It is covered from the front and back, maintaining a completely sealed and dust-proof function.

By the way, when the dustproof rib 30 is sufficiently spaced forward from the pair of first fulcrum pins 14 of the front cover 11,
Since it is disposed between the pair of protrusions 19 of the front lid 11, the dustproof rib 30 The gap l2 between the upper half 2 and the front corner _2a of the upper half 2 is sufficiently widened. Therefore, the front lid 1
Even if the dustproof rib 30 and the front corner 2a come close to each other due to the bending of the upper cover plate 13 of 1 or the bulge of the front corner 2a of the upper half 2, contact between them can be avoided. , the front lid 11 and the rear lid 17 can be opened smoothly at all times.

Further, since the dustproof rib 30 is integrally formed with the base 19a of the pair of protrusions 19 and the upper cover plate 13 of the front cover 11, the dustproof rib 30 also serves as a reinforcing rib, and the pair of protrusions The base 19a of the piece 19 is reinforced to be extremely strong. Therefore, even if the impact force of a drop or the like is concentrated on the pair of protrusions 19, the pair of protrusions 19 can be reliably prevented from being easily broken and damaged at the base 19a.

In addition, according to this dustproof rib 30, the front cover 11
Since the pair of protrusions 19 and the dustproof ribs 30 that are perpendicular to each other are integrally molded on the lower surface of the upper cover plate 13, the overall strength of the upper cover plate 13 is improved, and the above-mentioned Deflection of the cover plate 13 can be minimized.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various effective changes can be made based on the technical idea of the present invention.

For example, the shapes of the front lid and the rear lid, various structures for interlocking opening and closing of these lids, etc. can be modified in various ways other than those in the embodiment.

The present invention is not limited to tape cassettes for video tape recorders, but can be applied to tape cassettes for various recording and reproducing devices that record or reproduce various types of information using various recording or reproducing methods.

[Effect of idea]

As described above, according to the present invention, even if the front cover and the cassette housing are deformed due to molding distortion or aging, the dustproof ribs on the front cover are removed during opening of the front and rear covers. Since it is possible to prevent the front cover and the cassette housing from coming into contact with each other, the front cover and the rear cover can be opened smoothly at all times, and reliability during use is greatly improved.

In addition, according to the present invention, the pair of left and right protrusions of the front cover are made extremely strong, making it possible to prevent the pair of left and right protrusions from being accidentally damaged by impact forces such as drops, making it easier to handle. The safety at the time is significantly improved.

Moreover, structurally, the sealing and dust-proofing function of the tape is completely maintained, and the opening/closing operations of the front and rear lids are not changed in any way, so the usability is extremely good.

[Brief explanation of the drawing]

1 and 2 show an embodiment in which the present invention is applied to a tape cassette for a video tape recorder.
The figure is an exploded perspective view of the main parts. Figures 3 to 5 show a conventional example of a tape cassette for a video tape recorder, in which Figure 3 is an exploded perspective view of the entire tape cassette, and Figure 4 is a schematic diagram showing the opening and closing operations of the front and rear lids. Fig. 5 is a longitudinal sectional view of the main part showing the front lid and the rear lid in the middle of being opened. In addition, in the symbols used in the drawings, 1...Cassette housing, 4...Tape, 6...Front opening, 1
1...Front cover, 12...Front cover plate, 13...Top cover plate,
14...First fulcrum pin, 17...Rear cover, 17a...
...Top edge, 18...Second fulcrum pin, 19...Protrusion piece, 19a...Base, 23...Guide groove, 25...
...Guide pin, 30...Dustproof rib, 30a...
This is the lower edge.

Claims (1)

[Scope of Claim for Utility Model Registration] The tape 4 stored in the cassette housing 1 is stretched along the front opening 6 of the cassette housing 1, and is integrally formed into a substantially L-shaped cross section by the front cover plate 12 and the upper cover plate 13. The front cover 11 is rotatably attached to the cassette housing 1 by a pair of right and left first fulcrum pins 14 provided behind the front cover plate 12 that covers the front side of the tape 4, and Rear lid 1 that covers
A pair of left and right protrusions 1 are formed integrally with the lower surface of the upper cover plate 13 of the front cover 11 at a distance by means of a pair of left and right second fulcrum pins 18 provided at both left and right edges of the protrusions 7.
A pair of left and right guide grooves 23 for guiding a pair of left and right guide pins 25 provided on both left and right edges of the rear cover 17 are rotatably attached between the two ends of the cassette housing 1.
The rear lid 17 is provided with a dustproof rib 30 integrally molded along the lower surface of the upper lid plate 13 of the front lid 11, and extends rearward and upward from the pair of left and right second fulcrum pins 18 when the lid is closed. In the tape cassette in which the upper end edge 17a is brought into contact with the lower end edge 30a of the dust-proofing rib 30 from the front side, the dust-proofing rib 30 is placed above the pair of left and right second fulcrum pins 18. The base portions 19a of the pair of left and right protrusions 19 are arranged between the protrusions 19.
and the upper cover plate 13 of the front cover 11, and when the cover is closed, the upper edge 17a of the rear cover 17 is extended forward and upward from the pair of left and right second fulcrum pins 18 for the dustproofing purpose. A tape cassette characterized in that it is configured to come into contact with a lower end edge 30a of a rib 30 from the front side.