JPS6316071Y2 - - 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 cover 4, and a rear cover are each molded from synthetic resin. A magnetic tape 8 wound around a pair of left and right reels 6 and 7 is housed in the upper and lower halves 1 and 2, and these upper and lower halves 1 and 2 are fitted together from above and below with a plurality of screws 9. A cassette housing 3 is constructed by joining them together. 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 guided by the second
As shown in the figure and FIG. 4, it is passed along the front opening 10. 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. The partition wall 13 has a substantially U-shaped planar shape.
It is separated from the inside of the cassette housing 3 by. 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 and 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. 3
The front cover 4 is attached to a cassette so that it can be rotated up and down about both fulcrum pins 15. It is attached to the housing 3.

Next, as shown in FIG. 1, the rear lid 5 is integrally molded with an upper lid 17 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 near both left and right ends 4a, as shown in FIGS. 1 and 4. It is inserted into the insertion hole 20 and attached, and the rear cover 5 is attached to the front cover 4 so that it can 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 about 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 fulcrum pin 18 side. 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.
is moved back to the lower end 21a.

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

That is, as shown by the solid line in FIG. 5, when the lid is closed,
By locking the front cover 4 with the lock lever 28, the positions of both fulcrum pins 18 with respect to both guide grooves 21 are fixed, and as a result, both guided pins 23 are held at the lower ends 21a of both guide grooves 21. As a result, the rear cover 5 is held in the closed position.
However, the cassette housing 3 and both lids 4 and 5 are both molded from synthetic resin, and there are molding errors in each of them. For this reason, the rattling in the radial direction of both fulcrum pins 18 in both pin insertion holes 20 and the rattling in the groove width direction (direction perpendicular to the longitudinal direction) of the guide groove 21 of both guided pins 23 are reduced to zero. Therefore, both guided pins 23 can rotate slightly in the direction of arrow e around both fulcrum pins 18 at the lower ends 21a of both guide grooves 21. As a result, with the lid closed, when the rear side of the rear lid 5 from both fulcrum pins 18 is pushed upward as indicated by arrow A in FIG.
As shown by the imaginary line in FIG. 5, there was a defect in which the rear cover 5 rotated relative to the front cover 4 about both fulcrum pins 18 in the direction of arrow d, that is, to the rear and upper side. Note that if the front lid 4 wobbles in the closed state due to wobbling of both fulcrum pins 15 in the pin insertion holes 16 and wobbling when the lock lever 28 is engaged with the protrusion 31, the rear lid 5 This rattling is further amplified, and after this, the lid 5 is more easily rotated and opened in the closed state.

If the rear cover 5 is accidentally opened while the cover is closed, the magnetic tape 8 passing along the front opening 10 of the cassette case 3 is likely to be accidentally damaged, resulting in fatal damage. receive.

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 pair of locked parts are provided at positions near both left and right ends of the lower end of the rear lid, and are arranged at the rear of both the locked parts when the rear lid is lowered to a closed position. A pair of left and right locking portions are provided on the cassette casing, and when the rear lid is lowered from an open position to a closed position, both of the locked portions are engaged with the front portions of the locking portions from above. and when the rear lid is lowered to the closed position, the lower end of the rear lid is prevented from moving rearward with respect to the front lid, and the rear lid is rotated rearward and upward with respect to the front lid. This is a tape cassette which is prevented from moving and opening, and can prevent the rear cover from accidentally rotating rearward and upward relative to the front cover and opening when the cover is closed.

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 FIGS. 6 to 11. Note that the same reference numerals are given to the same structural parts as those of the conventional example shown in FIGS. 1 to 5, and the explanation thereof will be omitted. In addition, both ends 1 of the partition wall 13 are shown here.
3a, a pair of left and right fulcrum pins 18, a guide groove 21,
Although only one of the projecting piece 22 and the guided pin 23 will be explained, the same applies to the other one.

First of all, FIGS. 6 to 9 show the first embodiment, and in this case, first, the lower end 5a of the rear cover 5 is shown.
A pair of locked portions 38 consisting of convex portions protruding in the left-right direction are integrally molded on both left-right edges of the locking member. In addition, when the rear lid 5 is lowered to the closed position, a pair of locking portions 39 consisting of recesses arranged at the rear of both locked portions 38 are connected to the opposing surfaces of the left and right ends 13a of the partition wall 13. , is integrally molded and provided at the lower end position on the front end side. A pair of grooves 40 are formed on the opposing surfaces of the left and right end portions 13a along the locus of movement of both the locked portions 38 when the rear lid 5 is opened.

According to this first embodiment, when the rear lid 5 is lowered from the open position shown by the imaginary line in FIG. 4 to the closed position shown by the solid line in FIG. As shown in FIG. 8, both locked portions 38 are configured to descend within both groove portions 40 and to be engaged with the front portions of both locking portions 39 from above.

However, when the rear lid 5 is lowered to the closed position, the lower end 5a of the rear lid 5 is lowered as shown in FIGS.
When attempting to move rearward with respect to the front cover 4 as indicated by arrow B in the figure, both locked parts 38
9, the lower end 5a thereof is prevented from moving rearward.

Therefore, according to the tape cassette of the present invention, the rear side of both fulcrum pins 18 of the rear cover 5 is indicated by the arrow A in FIG.
Even if the lid 5 is pushed upward as shown in , the lid 5 will then rotate in the direction of the arrow d in FIG. is definitely prevented.

Note that when the front cover 4 is opened in the direction of arrow a' and the rear cover 5 is opened together with the front cover 4 as shown in FIG. It moves obliquely forward and upward from the inside as shown by arrow a'' and slips out of both locking parts 39, and then moves inside both groove parts 40 following the trajectory shown by arrow a.
Thereafter, the lid 5 can be opened without any problem.

Next, FIGS. 10 and 11 show a second embodiment, in which the lower end 5 of the rear cover 5 is shown.
The corner portions at both ends in the left and right direction of a are configured as a pair of locked portions 38. Then, while the lid 5 is lowered to the closed position, a pair of locking portions 39 consisting of convex portions disposed at the rear of both locked portions 38 are attached to both left and right ends 13 of the partition wall 13.
It is integrally molded in a protruding manner at the lower end position of the front end side of the opposite surface of a.

In this case, as in the first embodiment, even if the rear cover 5 attempts to rotate in the direction of arrow d in FIG. The facing end surface 39a then relatively presses both locked portions 38, which are corner portions of both left and right ends of the lower end 5a of the lid 5, from the rear side, thereby ensuring rotation of the lid 5 in the direction of the arrow d. will be prevented. Further, when the lid is opened, both the locked parts 38 are disengaged diagonally forward and upward from both the locking parts 39 and then move rearward and upward, similarly to the first embodiment.

Application Examples Although the embodiments of the present invention have 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 The present invention provides a pair of locked parts in the cassette casing, which are located near both ends of the lower end of the lid in the left and right direction, when the rear lid is lowered to the closed position as described above. Then, when the lid is in the closed state,
After that, the lower end of the lid is prevented from moving rearward with respect to the front lid, so that when the lid is closed, the rear lid moves rearward and upward with respect to the front lid as shown by the imaginary line in FIG. It is designed to reliably prevent the cassette from rotating and opening unexpectedly, and the sealing performance and reliability of the cassette can be greatly improved. That is, if the rear cover is accidentally opened in the closed position, the magnetic tape that is passed along the front opening of the cassette case is easily damaged, which can be fatal. The present invention provides something completely free of such risks.

[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. Figures 6 to 11
The figures show an embodiment of a tape cassette for a video tape recorder to which the present invention is applied, in which FIG. 6 is an enlarged sectional view of the main part showing the first embodiment, and FIG. Fig. 8 is a perspective view of the main parts of the same as above, Fig. 9 is a sectional view similar to Fig. 6 showing the movement trajectory of the locked part when opening the rear cover of the above, FIG. 10 is a sectional view similar to FIG. 6 showing the second embodiment, and FIG. 11 is a perspective view of the main parts of the same. In addition, in the symbols used in the drawings, 3...Cassette housing, 4...Front cover, 4a...Both ends of the front cover, 5...Rear cover, 5a...Lower end of the rear cover, 6, 7
... Reel, 8 ... Magnetic tape, 10 ... Front opening, 13 ... Partition wall, 13a ... Both ends of partition wall, 15 ... Fulcrum pin, 16 ... Pin insertion hole, 1
8...Fully pin, 20...Pin insertion hole, 21...
Guide groove, 23... Guided pin, 25... Torsion coil spring, 28... Lock lever, 29... Fulcrum pin, 30... Spring, 31... Projection, 38...
Locked part, 39...Locking part, 39a...End face of the locking part, 40...Groove part.

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. When the front cover is rotated in the opening direction, the guided pin is guided by the guide mechanism, so that the rear cover is rotated relative to the front cover in order to move the rear cover away from the front cover. In the tape cassette configured to rotate the lid together with the front lid in the opening direction while moving the tape cassette, a pair of locked parts are provided at positions near both left and right ends of the lower end of the rear lid, A pair of left and right locking parts are provided on the cassette casing, which are arranged at the rear of both the locked parts when the rear lid is lowered to the closed position, and the rear lid is moved from the open position to the closed position. When the rear cover is lowered to the closed position, both the locked parts are engaged with the front parts of the two locking parts from above, and when the rear cover is lowered to the closed position, the lower end of the rear cover is A tape cassette characterized in that the tape cassette is prevented from moving rearward with respect to the front cover, and thereafter is prevented from rotating rearward and upward relative to the front cover and opening.