JPS6331264Y2 - - 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 recording and reproducing devices such as video tape recorders and other various information processing devices, and is particularly suitable for tape cassettes whose planar shape is approximately A pair of fulcrum pins are integrally provided inside the left and right ends of the U-shaped front cover, and the pair of fulcrum pins of the front cover are inserted into a pair of pin insertion holes provided on the left and right side walls of the cassette case. The present invention relates to a tape cassette which is rotatably mounted and configured such that an opening provided on the front surface of the cassette housing can be opened and closed by rotating the front cover.

BACKGROUND ART AND PROBLEMS THEREOF FIGS. 1 to 5 show conventional examples of tape cassettes for video tape recorders.

First, as shown in FIGS. 1 and 2, a front lid 1,
The upper and lower halves 3 and 4 constituting the cassette housing 2 are each molded from synthetic resin. The front cover 1 has a substantially U-shaped planar shape with a front surface portion 1b and a pair of left and right end portions 1a, and a pair of fulcrums are located inside the left and right end portions 1a that face each other in parallel. A pin 5 is provided integrally with the same axis. Further, the upper and lower halves 3 and 4 are fitted from above and below and are integrally connected by a plurality of screws (not shown) to form the cassette housing 2. Inside the cassette housing 2, there are a pair of left and right halves. reels 6 and 7,
The magnetic tape 8 and the like wound around them are stored. The front cover 1 is rotatably mounted by being inserted into a pair of pin insertion holes 9 provided in the left and right side walls 2a of the cassette housing 2 by means of a pair of left and right fulcrum pins 5 thereof. The front lid 1 is configured to be freely rotatable approximately 90 degrees in the vertical direction shown by arrows a and a' between the closed lid position shown by the solid line in FIG. 2 and the opened lid position shown by the imaginary line in FIG. The front opening 10 of the cassette housing 2 is opened and closed by the rotation of the front cover 1. A gap 11 between one end 1a of the front cover 1 and one side wall 2a of the cassette housing 2
A torsion coil spring 12 attached to the outer periphery of one of the fulcrum pins 5 rotates the front cover 1 in the direction of closing the cover, which is the direction of arrow a' in FIG. As shown in FIGS. 3 and 4, the front end 12a of the torsion coil spring 12 is locked to a spring locking pin 13 integrally formed inside one end 1a of the front lid 1, and the rear end 12b is locked to the cassette housing. One side wall 2 of 2
It is locked by a spring locking part 14 that is integrally molded with a.

Next, as shown in FIGS. 3 and 4, a lock lever 15 is rotatably attached to one side wall 2a of the cassette housing 2. As shown in FIGS. This lock lever 1
5 is a fulcrum pin 16 and a lock claw 17 made of synthetic resin.
and a lock release projection 18 are integrally molded, and the fulcrum pin 16 is engaged with a pin engagement hole 19 provided in the side wall 2a as shown by arrows b and b' in FIG. It is configured to be freely rotatable in the front and rear directions. The lock lever 15 is urged by a spring 20 to rotate forward in the direction of arrow b'.
As shown in FIG. 4, when the front cover 1 is in the closed state, the lock pawl 1 of the lock lever 15 is attached to the locking protrusion 21 integrally formed inside one end 1a of the front cover 1.
7 is engaged so that the front lid 1 is locked in the closed state.

On the other hand, as shown in FIG. 3, when fitting the upper and lower halves 3 and 4, the pair of fulcrum pins 5 of the front cover 1 are inserted into the upper and lower halves 3 and 4 in order to form the pin insertion hole 9 of the cassette housing 2. It is inserted by semicircular holes 9a, 9b provided in the side walls 3a, 4a of. Further, the lock lever 15 is engaged with a pair of U-shaped pin engagement holes 19 formed at the upper edge of a lever housing portion 22 that is approximately U-shaped and provided on one side wall 4a of the lower half 4. . In this way, the front cover 1 and lock lever 1
5 is attached to the cassette housing 2.

Furthermore, when the tape cassette constructed as described above is attached to a video tape recorder (not shown),
As shown in FIG. 4, the lock release projection 18 of the lock lever 15 is pressed against the lock release member 23 on the video tape recorder side, and the lock lever 15 rotates in the direction of arrow b as shown by the imaginary line against the spring 20. be done. Then, the lock pawl 17 is removed from the locked protrusion 21, and the front lid 1 is unlocked in the closed state. At approximately the same time, the front cover 1 is opened in the direction of arrow a against the torsion coil spring 12, and the front opening 10 of the cassette case 2 is opened.

By the way, as shown in FIG. 5, the conventional tape cassette of this type has a structure in which the fulcrum pin 5 is simply inserted into the pin insertion hole 9 provided in the side wall 2a, so that the fulcrum pin 5 is simply inserted into the pin insertion hole 9 provided in the side wall 2a. As shown in FIG. 5, when the approximately central portion in the left-right direction of the front surface portion 1b of the front cover 1 bends in response to the pressing force in the direction of arrow c, both the left and right ends 1a bend in the direction of arrow d, as shown by imaginary lines in FIG. However, there is a drawback that the fulcrum pin 5 is displaced in the axial direction within the pin insertion hole 9, and the locking protrusion 21 of the front cover 1 and the lock pawl 17 of the lock lever 15 are disengaged. Furthermore, if the left and right end portions 1a were bent significantly, the fulcrum pin 5 would come out of the pin insertion hole 9, causing the front cover 1 to fall off from the cassette housing 2. If the front cover 1 is unlocked and the front cover 1 is opened unexpectedly, this is a serious defect that may damage the magnetic tape 8 passed through the front opening 10. It is a fatal defect of this type of tape cassette that the tape cassette falls off from the cassette housing 2.

Purpose of the invention The present invention aims to provide a tape cassette that can correct the above-mentioned defects.

Summary of the invention The present invention provides an integrated engagement part at a position close to at least one end of the front lid, on the back side of the front part of the front lid, and at a position facing the lower end surface of the front part. and when the front lid is in a state of closing at least the opening, the engaging portion is engaged with the inside of at least one side wall of the cassette housing, and the at least one end of the front lid is closed. This invention relates to a tape cassette configured to prevent the cassette casing from opening laterally outward.

According to the tape cassette of the present invention constructed in this way, at least when the front lid is in the closed state, the approximately central portion of the front surface of the front lid in the left-right direction is moved rearward (in the direction of arrow c in FIG. 1). Even if the front cover bends due to the pressing force of do not have.

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 10. 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.

First, as shown in FIGS. 6 to 8, the opening side ends 3 of the left and right side walls 3a, 4a of the upper and lower halves 3, 4 are
b, 4b, that is, the left and right side walls 2a of the cassette housing 2
The end face 2c of the opening side end 2b is a slightly tapered slope. An upper wall 3c on the opening side is formed in the left-right direction at a location slightly deeper than the corner 3d at the upper end of the opening side end 3b of the left and right side walls 3a of the upper half 3. And both left and right ends 1a of the front surface 1
The back surface 1 of the front part 1b of the front lid 1 is
c and facing the lower end surface 1d of the front surface 1b, as shown in FIGS. A rectangular parallelepiped protrusion 25 extending to
As shown in FIG. 8, a protruding portion 26 having an L-shaped cross section is integrally formed with the front lid 1 with a certain distance between them. This protruding portion 26 is located at the corner portion 33 of the end portion 1a of the front cover 1, as shown in FIG. They are integrally connected and formed. These protrusions 25 and 26 serve as guides for the opening side ends 2b of the left and right side walls 2a of the cassette housing 2,
It also serves to prevent the front lid 1 from rattling in the left and right direction when the front lid 1 is in the closed state. The reason why the protrusion 26 has an L-shaped cross section is to reinforce the left and right ends 1a of the front lid 1. Here, both opening side ends 2b constitute an engaging part on the cassette housing 2 side, and both protruding parts 25
constitutes an engaging portion on the front lid 1 side.

When the front lid 1 is rotated in the direction a' shown in FIG. 2 from the open position shown in FIG. 6 to the closed state shown in FIGS. The opening side end 2b of the cassette housing 2 is configured to be fitted into the gap 28.

According to the tape cassette of the present invention constructed as described above, when the front lid 1 is in the closed state, a pressing force is applied to the approximately central portion of the front lid 1 in the left-right direction as shown by the arrow c in FIG. In this case, the protrusion 25 of the front cover 1 comes into contact with the opening side end 2b of the cassette housing 2 from the direction d shown in FIG. 8, and is received by the opening side end 2b. As a result, both left and right ends 1 of the front cover 1
A is prevented from bending in the direction of arrow d as shown by the imaginary line in FIG. Therefore, both left and right ends 1a of the front cover 1 are reliably prevented from opening laterally outward of the cassette housing 1, and the fulcrum pin 5 is prevented from shifting in the axial direction within the pin insertion hole 9 as in the conventional case. Furthermore, the fulcrum pin 5 does not come out of the pin insertion hole 9, and the front cover 1 can be prevented from falling off from the cassette housing 2. When the lid 1 is open, as shown in FIG. 8, the open end 2b of the cassette housing 2 can be sandwiched between the protrusions 25 and 26 from both the left and right sides, as shown in FIG. It is also possible to prevent the lid 1 from rattling in the left and right direction.

Further, as a modification of the present invention, as shown in FIGS. 9 and 10, a certain amount is attached to the opening side end 2b of the side wall 2a of the cassette housing 2, here the opening side end 4b of the side wall 4a of the lower half 4. A prismatic protrusion 32 is formed that protrudes upward with a gap 31 in between. As shown in FIG. 10, an upright portion 34 having an L-shaped cross section is provided at the inner corner portion 33 of both left and right ends 1a of the front lid 1.
are integrally formed. And this upright part 3
4 is a plate-shaped portion 34a protruding in the depth direction and a front lid 1;
and a plate-like portion 34b protruding in the left-right direction.
Further, the width of the gap 31 is made wide so that the plate-shaped portion 34b does not become unrotatable when the front cover 1 is rotated.

In this way, even in the modified example shown in FIGS. 9 and 10, the front cover 1 is moved from the open position in FIG. 9 to the open position in FIG.
When the lid is rotated in the direction a' to bring the lid into the closed state shown in FIG. Therefore, when the front lid 1 is in the closed state, even if the approximately central portion of the front lid 1 in the left-right direction receives a pressing force in the direction of the arrow c as shown in FIG. Since the front lid 1 is abutted and received by the portion 32, the left and right ends 1a of the front lid 1 will not bend and open in the direction of the arrow d shown in FIG.

The present invention is not limited to the above embodiments, and various applications and modifications can be made without departing from the scope of the present invention.

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 As described above, in the present invention, at least when the front lid is in the closed state, approximately the center in the left-right direction of the front surface of the front lid receives a pressing force toward the rear side (in the direction of arrow c in Fig. 1). Even if the front cover is bent, at least one end of the front cover does not open outward from the side of the cassette case, so the bending of the front cover prevents the front cover from locking against the cassette case. This has the advantage of preventing the front cover from coming off or falling off from the cassette case.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional example of a tape cassette for a video tape recorder, Fig. 2 is a side view of the same, Fig. 3 is a partially cutaway exploded perspective view of the main part, and Fig. 4 is the same as Fig. 2. FIG. 5 is an enlarged partially cutaway side view of the main part, and is a sectional view taken along line V-V in FIG. 4. 6 to 10 show an embodiment of a tape cassette for a video tape recorder to which the present invention is applied, in which FIG. 6 is a perspective view of the main part with the front lid open, and FIG. 7 is a cutaway perspective view of the main part of the front lid in the closed state, No. 8
The figure is a sectional view taken along the - line in FIG. 7, FIG. 9 is a perspective view of the main part similar to FIG. 6 in a modified example, and FIG. 10 is a sectional view similar to FIG. 8 in a modified example of FIG. It is. In addition, in the symbols used in the drawings, 1...front cover, 1a...pair of left and right ends of the front cover, 1b...front part of the front cover, 1c...back side of the front part, 1d...of the front part. lower end surface, 2...cassette housing, 2a...pair of left and right side walls of the cassette housing, 5...fulcrum pin,
9...Pin insertion hole, 10...Front opening, 25...
The protruding portion is an engaging portion, and 34a is a plate-like portion that is an engaging portion.

Claims (1)

[Scope of utility model registration request] It has a front lid whose planar shape is substantially U-shaped by a front portion and a pair of left and right ends, and a pair of fulcrum pins are integrally provided inside the pair of left and right ends of the front lid, The front lid is rotatably attached by inserting the pair of fulcrum pins into the pair of pin insertion holes provided on the left and right side walls of the cassette housing, and the rotation of the front lid allows the front lid to be attached to the front surface of the cassette housing. In a tape cassette configured to be able to open and close an opening provided therein, at a position close to at least one end of the front lid, on the back surface of the front surface of the front lid and on the lower end surface of the front surface. An engaging part is integrally provided at a facing position, and when the front cover is in a state of closing at least the opening, the engaging part is engaged with the inside of at least one side wall of the cassette housing, and the front cover is engaged with the inside of at least one side wall of the cassette case. A tape cassette, characterized in that the at least one end of the lid is configured to prevent the lid from opening laterally outward of the cassette housing.