JPS6312473Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a tape cassette that is most suitable for application to a recording/reproducing device such as a video tape recorder, and is particularly suitable for passing a stored tape along a front opening. a front lid rotatably attached to the cassette housing via a fulcrum pin to cover the front side of the passed tape, and a front cover that covers the rear side of the passed tape. a rear lid rotatably attached to the front lid via a fulcrum pin; a guided pin provided on the rear lid; and a guide groove provided on the cassette housing to guide the guided pin. The front cover is rotated relative to the front cover in order to separate the rear cover to the rear of the front cover by guiding the guided pin in the guide groove when the front cover is rotated in the opening direction. The present invention relates to a tape cassette constructed such that the lid is rotated together with the front lid in the opening direction while the tape cassette is moved.

BACKGROUND ART AND PROBLEMS A conventional tape cassette for a video tape recorder of this type is constructed as shown in FIGS. 1 to 5.

First, as shown in FIG. 1, a cassette housing 3 composed of upper and lower halves 1 and 2, a front lid 4, and a rear lid 5 are each molded from synthetic resin. Then, the magnetic tape 8 is wound around a pair of left and right reels 6 and 7.
are housed in the upper and lower halves 1 and 2, and these upper and lower halves 1 and 2 are fitted into each other from above and below and are connected together by a plurality of screws 9 to form a cassette housing 3.
is configured. A front opening 10 is provided on the front surface of the cassette housing 3 over its entire length in the left and right direction, and a pair of tape guides are integrally formed on the lower half 2 at positions near both left and right ends of the front opening 10. 11, the magnetic tape 8 is passed along the front opening 10 as shown in FIGS. 2 and 4. Further, a recess 12 is formed in the cassette housing 3 on the rear side of the front opening 10 inside the pair of tape guides 11. Partition wall 1 with a U-shaped planar shape
3 separates it from the inside of the cassette housing 3. Note that both the top and bottom of this recess 12 are open.

Next, the front cover 4 has a substantially U-shaped planar shape as shown in FIG. 1, and a pair of fulcrum pins 15 are integrally molded on the inside of both left and right ends 4a so as to have the same axis. There is. As shown in FIGS. 2 to 4, the front cover 4 is attached to the left and right side walls of the cassette housing 3 by its pair of fulcrum pins 15 in order to cover the front side of the magnetic tape 8 that is being passed along the front opening 10. 3a
The pin insertion hole 16 is inserted into a pair of pin insertion holes 16 provided on the front end side of the pin so as to be coaxial with each other.
This front cover 4 is attached to the cassette housing 3 so that it can rotate up and down about both fulcrum pins 15.

Next, as shown in FIG. 1, the rear lid 5 has an upper lid 17 integrally molded along its upper edge, and a pair of fulcrum pins are provided at approximately the center of the left and right edges of the rear lid 5 in the vertical direction. 18 are integrally molded with each other on the same axis. As shown in FIGS. 2 and 4, the rear cover 5 is disposed in a recess 12 parallel to the front cover 4 to cover the rear side of the magnetic tape 8 that is passed along the front opening 10. . The rear lid 5 has its pair of fulcrum pins 18 connected to a pair of pins of a pair of protrusions 19 integrally molded on the rear surface of the front lid 4 in the vicinity of both left and right ends 4a, as shown in FIGS. 1 and 4. The rear cover 5 is attached to the front cover 4 so as to be able to rotate up and down about both fulcrum pins 18. Furthermore, the upper lid 17
is arranged to cover the upper surface of the recess 12 as shown in FIGS. 2 and 4.

Next, as shown in FIGS. 1 and 2, the left and right end portions 13a of the partition wall 13 are opposed in parallel from the left and right directions, and the opposing surfaces of the left and right end portions 13a have a gentle S-shape. A pair of bent guide grooves 21 are provided. A pair of protrusions 22 are integrally molded on the rear surface of both left and right edges of the rear cover 5 below both fulcrum pins 18, and a pair of protrusions 22 are integrally molded on the outside of both protrusions 22 so as to be coaxial with each other. A guided pin 23 is loosely fitted into both guide grooves 21. Further, as shown in FIGS. 2 and 3, a torsion coil spring 25 is wound around the outer periphery of one of the fulcrum pins 15 between one end 4a of the front cover 4 and one side wall 3a of the cassette housing 3. Both front and rear ends 25a, 25b of the torsion coil spring 25 are engaged with protrusions 26, 27 integrally formed on the end 4a and the side wall 3a, respectively. Therefore, the torsion coil spring 25 biases the front lid 4 to rotate in the direction of the arrow a in FIG. Further, as shown in FIG. 3, a fulcrum pin 29 with a lock lever 28 integrally formed on one side wall 3a of the cassette housing 3 is provided.
It is attached so that it can freely rotate back and forth through the . The lock lever 28 is rotated in the direction of arrow b by a spring 30 attached to the side wall 3a, and is engaged with a protrusion 31 integrally formed inside one end 4a of the front cover 4. The front cover 4 is configured to be locked in the closed position.

According to the tape cassette constructed as described above, when the cassette is not in use, the front lid 4 is locked in the closed state by the lock lever 28 as shown by the solid line in FIG. 4. In this lid closed state, the magnetic tape 8 passing along the front opening 10 is covered from the front and back by the front lid 4 and the rear lid 5, as shown by the solid line in FIG. It is a so-called completely sealed tape cassette.

Next, when the tape cassette is installed in the video tape recorder, the lock lever 28 is rotated in the direction of arrow b' by the lock release member 33 against the spring 30, as shown by the imaginary line in FIG. , front lid 4
When the lock is released, the front lid 4 is pushed up by the lid opening member 34, and the front lid 4 is pushed up approximately 90 degrees in the lid opening direction, which is the direction of arrow a', against the torsion coil spring 25. The front opening 10 is opened by being rotated by . The front cover 4 is then rotated about 90 degrees in the direction of arrow a' from the closed position shown by solid lines in FIG. 4 to the open position shown by phantom lines about both fulcrum pins 15. Therefore, since both fulcrum pins 18 of the rear lid 5 are also rotated in the same direction and at the same angle, the rear lid 5 also rotates in the same angle as the front lid 4.
At the same time, the lid is rotated from a closed position shown by a solid line in FIG. 4 to an open position shown by a phantom line. At this time, by rotating both fulcrum pins 18 in the direction of arrow a', both guided pins 23 are aligned with both guide grooves 2.
1 and moved in the direction of arrow c, and by the guiding action of both guide grooves 21, the rear cover 5 moves in the direction of arrow d with respect to the front cover 4 around both fulcrum pins 18. The lid is opened in the direction of arrow a' while being rotated in a direction to move away from the rear. When the rear lid 5 is opened, the guided pin 23 is moved in the direction of the arrow c in the guide groove 21 so as to be drawn toward the side surface 36 of the guide groove 21 on the side of both fulcrum pins 18. Furthermore, when the lid is closed, the front lid 4 is rotated in the direction of the arrow a in FIG.
While being rotated in the direction d', it is moved back in the direction of the arrow a,
The guided pin 23 also moves in the direction of arrow c' within the guide groove 21, and moves to the guide groove 21 shown by the solid line in FIG.
It is moved back to the lower end 21a of.

However, the conventional tape cassette constructed and operated as described above has the following defects.

That is, as explained in FIG. 3, the front cover 4 is locked in the closed position by the lock lever 28, and in conjunction with the locking of the front cover 4, the rear cover 5 is also locked in the closed position. be. However, since the cassette housing 3, both lids 4 and 5, and the lock lever 28 are each molded from synthetic resin, there are molding errors in these, and when the lids 4 and 5 are locked in the closed position, for example, Both fulcrum pins 15 of the front lid 4 may wobble within the pin insertion holes 16 of the cassette housing 3, or the protrusion 31 of the front lid 4, which the lock lever 28 engages with, may wobble against the lock lever 28. It is difficult to completely prevent such things from happening.

For this reason, conventionally, the front lid 4 tends to wobble in the vertical direction, which is the direction of arrows a and a', when the lid is closed, as shown in FIG. That is, when the front cover 4 is lightly pressed up and down with a hand, the front cover 4 easily shakes up and down.

However, if the front cover 4 shakes in the vertical direction, the force will be transferred from both pin insertion holes 20 to both fulcrum pins 1.
8 to the rear lid 5, and thereafter the lid 5 also becomes rattled in the vertical direction. And at that time, the rear lid 5
Due to the guiding action of both guided pins 23 by both guide grooves 21, the fulcrum pins 18 are greatly enlarged in the directions of arrows d and d' in FIG. This resulted in a defect that caused the user to experience a significant sense of discomfort and disbelief.

Purpose of the invention The present invention aims to provide a tape cassette capable of correcting the above-mentioned defects.

Summary of the invention The invention is based on the above-mentioned tape cassette.
A tape cassette in which a pin insertion hole provided on the front lid side, into which a fulcrum pin integrally provided on the rear lid is inserted and rotatably supported, is an elongated hole extending in the vertical direction. Even if the front lid wobbles in the vertical direction, it is possible to prevent the rear lid from wobbling in the vertical direction as well.

Embodiment An embodiment in which the present invention is applied to a tape cassette for a video tape recorder will be described below with reference to FIG. Note that the same structural parts as those of the conventional example shown in FIGS. 1 to 5 are given the same reference numerals, and the explanation thereof will be omitted. In addition, both ends 13a of the partition wall 13, a pair of left and right fulcrum pins 18, a guide groove 21, and a projecting piece 22 are shown here.
Although only one of the guide pins 23 and 23 will be explained, the same applies to the other one.

That is, in the present invention, the pin insertion hole 20 provided in the protrusion 19 of the front cover 4, into which the fulcrum pin 18 provided integrally with the rear cover 5 is inserted and rotatably supported, is formed into an elongated hole extending in the vertical direction. When the front cover 4 and the rear cover 5 are in the closed state as shown by the solid line in FIG.
It is configured so that it is biased toward the a side.

Therefore, according to the tape cassette of the present invention, the sixth
As shown by the imaginary line in the figure, the front cover 4 is located at the arrow a within the vertical gap A between the lower surface of the guided pin 23 and the lower end 20b of the long pin insertion hole 20.
Even if some wobbling occurs in the vertical direction, which is the a' direction, the wobbling force is absorbed within the gap A and is not transmitted to the rear lid 5. Therefore, even if the front cover 4 wobbles in the vertical direction, the wobbling can be prevented so that the rear cover 5 can be rotated in the directions of arrows d and d' as shown by the imaginary lines in FIG. This will definitely be prevented. Note that, as shown by the imaginary line in FIG. 6, the front edge 17a of the upper lid 17 of the rear lid 5 is
Since it is stacked on the upper edge 4b, the back cover 5 is also subjected to a very slight movement force in the same direction due to the wobbling of the front cover 4 in the directions of arrows a and a', but the movement at that time is Compared to the rotation in the directions of arrows d and d' shown by imaginary lines in FIG. 5, this is extremely small and poses almost no problem.

As shown in FIG. 4, when the front cover 4 is opened in the direction of arrow a', from the time when the front cover 4 is rotated from the closed position to a predetermined height in the direction of arrow a',
Since the lower end 20b of the pin insertion hole 20, which is an elongated hole, comes into contact with the fulcrum pin 18 and lifts it in the direction of arrow a', the rear cover 5 moves along with the front cover 4 in the direction of the arrow a' without any problem.
The lid is opened by rotating in the a′ direction. And vice versa,
When closing the lid, when the front lid 4 is rotated in the direction of arrow a, the upper end 20a of the long pin insertion hole 20 comes into contact with the fulcrum pin 18 and pushes it down in the direction of arrow a. The lid 5 is turned and closed together with the front lid 4 in the direction of arrow a without any problem.

Application Example Although one embodiment of the present invention has been described above, the present invention can be applied to tape cassettes for various recording and reproducing devices other than video tape recorders and various other information processing devices.

Effects of the invention As described above, the present invention provides a pin insertion hole provided on the front lid side into which a fulcrum pin integrally provided on the rear lid is inserted and rotatably supported, with a length extending in the vertical direction. It is constructed with holes so that the vertical shaking force of the front lid is not transmitted to the rear lid, so even if the front lid shakes slightly in the vertical direction, the rear lid will also move up and down. It is possible to eliminate the occurrence of wobbling in the direction and giving the user a significant sense of discomfort or distrust. Moreover, in terms of structure, the pin insertion hole is simply formed into a long hole in the vertical direction, and the resin processing of the front and rear lids can be done in exactly the same way as before, and there is no high cost at all. .

Note that the "long hole in the vertical direction" in the scope of the utility model registration claim includes not only straight long holes and arc-shaped long holes, but also circular holes with a diameter larger than the diameter of the fulcrum pin (so-called stupid holes). .

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view illustrating a conventional example of a tape cassette for a video tape recorder, Fig. 2 is a plan view of the same completed assembly, and Fig. 3 is Fig. 2-
FIG. 4 is an enlarged sectional view taken along the lines of FIG. 2, and FIG. 5 is a sectional view similar to FIG. 4 explaining the opening operation of the rear lid. FIG. 6 is an enlarged sectional view of essential parts of an embodiment of a tape cassette for a video tape recorder to which the present invention is applied. In addition, in the symbols used in the drawings, 3...Cassette housing, 4...Front cover, 5...Rear cover, 6, 7...
... Reel, 8 ... Magnetic tape, 10 ... Front opening, 15 ... Fulcrum pin, 16 ... Pin insertion hole, 1
8...Fully pin, 19...Protrusion piece, 20...Pin insertion hole (long hole), 20a...Top end of pin insertion hole, 2
0b...lower end of pin insertion hole, 21...guide groove,
21a...lower end of the guide groove, 23...guided pin, 25...torsion coil spring.

Claims (1)

[Scope of utility model registration request] a cassette housing in which a stored tape is passed along a front opening; a front lid rotatably attached to the cassette housing via a fulcrum pin to cover the front side of the passed tape; A rear lid is rotatably attached to the front lid via a fulcrum pin to cover the rear side of the passed tape, a guided pin provided on the rear lid, and a pin for guiding the guided pin. and a guide groove provided in the cassette case, and when the front cover is rotated in the opening direction, the guided pin is guided by the guide groove, so that the rear cover can be moved behind the front cover. In the tape cassette, the tape cassette is configured such that the tape cassette is rotated relative to the front cover to separate the tape cassette from the front cover, and then the cover is rotated together with the front cover in the direction of opening the cover. A tape cassette characterized in that the pin insertion hole provided on the front lid side, which is rotatably supported by the tape cassette, is an elongated hole extending in the vertical direction.