JPH0632187B2 - Tape cassette - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is most suitable for application to, for example, a tape cassette for a video tape recorder, and in particular, a pair of fulcrums in which a front lid is integrally provided inside the left and right side plates thereof. A pin is rotatably supported on both the left and right side walls of the cassette housing, and the front plate of the front lid opens and closes the front opening of the cassette housing. In a tape cassette configured to lock the front lid in a closed state by a lock lever pivotally supported between a front plate of the front lid and a fulcrum pin, With a recess,
The present invention relates to a tape cassette, characterized in that the front lid is locked in a closed state by engaging a convex portion provided integrally with the lock lever in the concave portion.

[0002]

2. Description of the Related Art FIG. 5 shows a prior application of a tape cassette for a video tape recorder previously filed by the applicant of the present invention. First, the front lid 1 is attached to the left and right side faces 1a thereof. A pair of fulcrum pins 2 integrally provided on the inner side pivotally support the left and right side walls 4 of the cassette housing 3 so as to be rotatable in the directions of arrows a and b, and the front plate 1b of the front lid 1 allows the cassette housing 3 to rotate. The front opening 5 is opened and closed.
That is, the front lid 1 is urged to rotate in the direction of arrow a by the return spring 6 wound around the outer periphery of the fulcrum pin 2, and the front plate 1b closes the front opening 5 as indicated by the solid line. When the front lid 1 is rotated in the direction of arrow b against the return spring 6 as shown by the chain line, the front opening 5 is opened.

Next, inside the side wall 4 of the cassette housing 3, between the front plate 1b of the front lid 1 and the fulcrum pin 2, a lock lever 7 is integrally provided at the upper end of the fulcrum pin 8 to form an arrow c. , D direction, is pivotally supported. The lock lever 7 is urged to rotate in the direction of arrow c by a return spring 9 mounted on the outer periphery of the fulcrum pin 8, and the convex portion 10 is integrally provided on the rear surface of the front plate 1b of the front lid 1 to project. The front lid 1 is configured to be locked in the closed state by engaging with the upper portion of the portion 11. The lower end 7a of the lock lever 7 which is urged to rotate in the direction of arrow c is in contact with the front end bottom wall 12 of the cassette housing 3 from behind.

When this tape cassette is inserted into the cassette holder of a video tape recorder in the direction of arrow e, as is conventionally known, the lock release protrusion 13 provided on the bottom plate of the cassette holder has a cassette housing. 3 is inserted into the slit 14 provided in the lower portion of the front end bottom wall 12 from the direction of arrow f, and the protrusion 13 thereof causes the lock lever 7 to rotate in the direction of arrow d in the direction of arrow d against the return spring 9. Thus, the lock of the front lid 1 in the closed state is released.

According to this prior invention, since the lock lever 7 is arranged between the front plate 1b of the front lid 1 and the fulcrum pin 2, the slit 14 of the unlocking protrusion 13 for unlocking the lock lever 7 is released. Insertion depth l in the direction of arrow f
Can be made smaller.

[0006]

This prior application has a structure in which the convex portion 11 is integrally provided on the back surface of the front plate 1b of the front lid 1 as shown in FIG. The structure of the mold used for injection molding of No. 1 with a synthetic resin was extremely complicated.

That is, the front surface of the front lid 1 and the fulcrum pin 2 portion cannot be molded without using the molds 15, 16, 17 which are divided into front and rear and up and down, and the convex portion 11 portion of the front plate 1b of the front lid 1 is formed. Cannot be molded without using a mold 18 that is divided into front and rear. Therefore, these four molds 15, 16, 17, 18
After the front lid 1 is formed by combining as shown by the solid line, when the three molds 16, 17, 18 on the rear side are disassembled and the front lid 1 is taken out, first, the molds 16, 17 are indicated by arrows g, After disassembling in the h direction, the mold 18 must be disassembled in the arrow i direction.

According to the present invention, as in the case of the prior application, the front lid is closed by a lock lever provided between a fulcrum pin integrally provided on one side plate of the front lid and a front plate of the front lid. An object of the present invention is to provide a structure in which the front lid can be easily formed by a mold having an extremely simple structure, even though the tape cassette is configured to be locked in the state.

[0009]

According to the present invention, in a tape cassette similar to that of the prior application, a recess is provided on the back surface of the front plate of the front lid, and the projection provided integrally with the lock lever is provided with the recess. The tape cassette is characterized in that the front lid is locked in a closed state by engaging the inside.

[0010]

According to the present invention, as shown in FIG. 4, when the front lid 1 is injection-molded with a synthetic resin, one of the molds 41 and 42 which is vertically divided by the fulcrum pin 2 portion of the front lid 1. The demonic cap 1 can be easily molded by a very simple mold structure in which the slide core 43 for molding the recess 21 is provided in the mold 42. After the front lid 1 is molded, both molds 41, 42
When disassembling and removing the front lid 1, the slide core 43 may be slid in the direction of arrow j, and then both molds 41 and 42 may be simply disassembled in the directions of arrow k and m (vertical direction).

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tape cassette for a video tape recorder to which the present invention is applied will be described below with reference to FIGS. It should be noted that the same structural parts as those of the invention of the prior application shown in FIG.

That is, according to the present invention, the front plate 1b of the front lid 1 is used.
A recess 21 is provided on the back surface of the lock lever 7, and a slightly large projection 22 provided integrally with the lock lever 7 is engaged in the recess 21 as shown by the solid line in FIG. Is configured to be locked in the closed state shown by the solid line in FIG.

A ceiling plate 1c is integrally provided on the upper end of the front plate 1b of the front lid 1. The cassette housing 3 is composed of upper and lower halves 23 and 24,
The left and right side walls 4 are the half side walls 23 of the upper and lower halves 23, 24.
a, 24a. The pair of left and right fulcrum pins 2 of the front lid 1 are rotatably pivoted so as to be sandwiched from above and below between the pivot support recesses 25a and 25b formed in the upper and lower split surface portions of the half side walls 23a and 24a. There is.

The return spring 6 is composed of a torsion coil spring, and is mounted on the outer periphery of the one fulcrum pin 2 in the gap 26 between the one side plate 1a of the front lid 1 and the one side wall 4. In addition, both ends 6a and 6b of the return spring 6 are locked to a pair of locking portions 27a and 27b integrally provided on the side surface plate 1a and the half side wall 24a, so that the front lid 1 in FIG. It is urged to rotate in the direction of arrow a.

On the front lid side of the half side walls 23a and 24b, a lock lever mounting wall 28 having a substantially U-shaped plane is formed.
a and 28b are integrally provided, and the lock lever 7 is housed in slits 29a and 29b formed in the lock lever mounting walls 28a and 28b and extending in the vertical direction. The fulcrum pin 8 of the lock lever 7 is inserted from above into a pair of pivot support recesses 31 provided at the upper end of the lock lever mounting wall 28b of the lower half side wall 24a so that the fulcrum pin 8 of the lock lever mounting wall 28a of the upper half side wall 23a. It is sandwiched from above at the bottom edge. The return spring 9 is composed of a torsion coil spring, and is mounted on the outer circumference of the fulcrum pin 8 in the slits 29a and 29b.
Both ends 9a, 9b of the lock lever 7 are integrally provided on the lock lever 7 lock lever mounting wall 28a.
0b causes the lock lever 7 to move in the direction of arrow c.
It is biased to rotate in the direction.

In FIG. 2, 32 is a tape reel,
Reference numeral 33 is a magnetic tape, and 34 is a tape guide or the like. As shown in FIG. 2, since the lock lever 7 is mounted close to the side plate 1a of the front lid 1, a solid line 1 and a line 1 are formed in the cassette housing 3. The traveling space of the magnetic tape 33 whose traveling path can be varied as shown by the dotted line can be made large.

The mold structure shown in FIG. 4 for molding the front lid 1 of the tape cassette of the present invention having the above-described structure has been described in the above section [Operation], and will be omitted.

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

The present invention is not limited to tape cassettes for video tape recorders, but can be applied to tape cassettes for various recording / reproducing devices that record or reproduce various upper parts by various recording / reproducing methods. .

[0020]

According to the present invention, as in the case of the prior application, the front lid is locked by the lock lever provided between the fulcrum pin integrally provided on the inside of one side plate of the front lid and the front plate of the front lid. Although the tape cassette is configured to be locked in the closed state, the front lid can be easily molded with a die having an extremely simple structure, so that the manufacturing cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the tape cassette for a video tape recorder showing an embodiment of the present invention, taken along the line II of FIG.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a perspective view of a main part of the tape cassette shown in FIG.

4 is a cross-sectional view illustrating a mold structure used to manufacture the tape cassette illustrated in FIG.

FIG. 5 is a sectional view of a main part of a tape cassette according to a prior application.

FIG. 6 is a cross-sectional view illustrating a mold structure used to manufacture the tape cassette shown in FIG.

[Explanation of symbols]

 1 front lid 1a side plate of front lid 1b front plate of front lid 2 fulcrum pin 3 cassette housing 4 side wall 5 front opening 7 lock lever 8 fulcrum pin 21 concave portion 22 convex portion

Claims (1)

[Claims] 1. A cassette housing is rotatably pivoted on both left and right side walls of a cassette housing by a pair of fulcrum pins integrally provided on the inside of the left and right side plates of the front housing. The front lid is closed by a lock lever that is pivotally supported between the front plate of the front lid and the fulcrum pin inside one side wall of the cassette housing. In the tape cassette configured to be locked to the front lid, a concave portion is provided on the back surface of the front plate of the front lid, and the convex portion integrally provided on the lock lever is engaged in the concave portion to lock the front lid. A tape cassette characterized by being configured to be locked in a closed state.