JPS6312472Y2 - - 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 cassette housing, a front lid rotatably attached to the cassette housing to cover the front side of the passed tape, and a front lid rotatably attached to the front lid to cover the rear side of the passed tape. It has a rear cover rotatably attached, a guided pin provided on the rear cover, and a guide groove provided on the cassette casing for guiding the guided pin, and the front cover is opened when the front cover is opened. When rotating in the direction of the lid, the guided pin is guided by the guide groove, so that the rear lid is moved away from the front lid while being rotated relative to the front lid, and then the lid is opened together with the front lid. This invention relates to a tape cassette configured to be rotated toward the lid.

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 integrally formed on the lower half 2 are located 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. Furthermore, 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, and this recess 12 is integrally molded into the upper and lower halves 1 and 2 together with both tape guides 11. Partition wall 1 whose planar shape is almost U-shaped
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 by the front lid 4 and the rear lid 5 from the front and back, 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. Note that when the rear cover 5 is opened, the guided pin 23 is drawn toward the front side surface 36, which is the side surface of the guide groove 21 on the side of both fulcrum pins 18, and moves inside the guide groove 21 in the direction of arrow c. will be moved to Furthermore, when the lid is closed, the front lid 4 is rotated in the direction of arrow a in FIG. The guided pin 23 also moves within the guide groove 21 in the direction of arrow c' and is moved back to the lower end 21a of the guide groove 21 shown by the solid line in FIG. 4. .

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

That is, in the closed state shown by the solid line in FIG.
receives a rearward pressing force as shown by arrow A, and when the rear cover 5 is pressed rearward by the front cover 4, both guided pins 23 move toward both fulcrum pins 18 of both guide grooves 21. It is pressed against the rear side surface 37, which is the side surface opposite to the rear side surface 37. And in that case, that aspect 3
Due to the guiding action of 7, the guided pin 23 has a fifth
A pressing force is applied upward in the direction of arrow c in the figure, and the rear cover 5 moves upward in the direction of arrow d with respect to the front cover 4 about both fulcrum pins 18 as shown by the imaginary line in FIG. There was a defect in the product that caused it to rotate slightly and open unexpectedly.

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.
When the front lid in the closed state receives a rearward pressing force and the rear lid is pressed rearward by the front lid, the guided pin is guided by the guide groove and pushed upward. In order to prevent the lid from rotating and opening with respect to the front lid when the lid is moved to the side, the guided portion is pressed rearward at the lower end of the rear side of the guide groove. This is a tape cassette with a recess into which a pin can fit, and even if the front lid is pushed backwards when the lid is closed, it will prevent the rear lid from accidentally rotating and opening. I can do it.

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 rear side surface 3 of the guide groove 21
7 is provided with a recess 38 into which the guided pin 23 can fit.

According to the tape cassette of the present invention having the concave portion 38 as described above, when the front lid 4 is in the closed state shown by the solid line in FIG. When the rear lid 5 is pressed rearward by the front lid 4, the guided pin 23 enters the recess 38 as shown by the imaginary line in FIG.

As a result, the rear cover 5 is simply moved in parallel in the direction of arrow A by being pressed by the front cover 4 as shown by the imaginary line in FIG. The guide pin 23 receives an upward pressing force in the direction of arrow c due to the guiding action of the rear side surface 37 of the guide groove 21, and the rear cover 5 moves upward in the direction of arrow d with respect to the front cover 4. It is reliably prevented from rotating to the side and opening.

In the tape cassette of the present invention, the height B of the recess 38 and the radius C of the guided pin 23 are
It is necessary to determine the relationship between B>C.

Note that when the rear cover 5 is opened, the guided pin 23 is pulled toward the front side surface 36 of the guide groove 21 and moved in the direction of arrow c, as described in FIG. 23 is the recess 38
The guided pin 23 is not engaged in any way with the arrow c.
move smoothly in the direction.

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.

As described above, the present invention provides a recess at the lower end of the rear side of the guide groove, and when the rear lid is pressed rearward through the front lid, the guided pin of the rear lid enters into the recess, thereby preventing the rear lid from being subjected to an upward pushing force by the guiding action of the guided pin by the rear side of the guide groove, so that when the rear lid is pressed rearward through the front lid, as described above, it is possible to reliably prevent the rear lid from rotating upward relative to the front lid and opening unexpectedly. Moreover, structurally, a recess is simply provided at the lower end of the rear side of the guide groove, and the resin processing of the cassette housing can be performed in exactly the same way as before, without any increase in cost.

[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 the main 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, 13 ... Partition wall, 13a ... Both ends of partition wall, 15, 18 ... Fulcrum pin, 16, 20 ... Pin insertion hole, 21 ... Guide groove, 21a... lower end of the guide groove, 23... guided pin, 25... torsion coil spring, 37... rear side surface of the guide groove, 38... recess.

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 to cover the front side of the passed tape; and a front lid rotatably attached to the cassette housing to cover the front side of the passed tape; A rear lid rotatably attached to the front lid to cover the rear side, 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. In a tape cassette configured such that the lid is rotated in the direction of opening the lid together with the front lid while the lid is moved, the front lid in the closed state receives a pressing force toward the rear side, and the front lid rotates. When the rear lid is pressed rearward, the guided pin is guided by the guide groove and moved upward, so that the lid then rotates relative to the front lid and opens. In order to prevent this, a tape cassette is provided with a recessed portion at the lower end of the rear side surface of the guide groove into which the guided pin pressed rearward can enter.