JP2629279B2 - Front cover mounting device for tape cassette - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front cover mounting device which is most suitable for use in, for example, a tape cassette for a video tape recorder.

[Summary of the Invention]

According to the present invention, a support shaft is attached to a synthetic resin upper half of a cassette housing, and a front opening of the cassette housing is opened and closed by a metal front lid rotatably mounted on the support shaft. In the tape cassette thus constructed, the support shaft can be attached to the upper half by welding, and a pair of cylindrical portions of the front lid into which both ends of the support shaft are inserted are crimped to remove the support shaft. By configuring to stop, the hinge for attaching the support shaft to the upper half can be omitted,
Further, the support shaft can be easily prevented from coming off.

[Conventional technology]

The applicant of the present invention has previously filed, for example, Japanese Utility Model Application No. Sho 60-3252 and Japanese Utility Model Application No. Sho 60-187937 as examples of prior applications of this type of tape cassette front lid mounting apparatus.

In each of these prior application examples, the front lid and the hinge are formed of synthetic resin, the hinge is attached to the upper half of the cassette housing, and a plurality of cylindrical portions are formed integrally with the hinge and the front lid. A metal support shaft is inserted through the inside of the housing, and a front cover is rotatably mounted around the support shaft, and the front cover opens and closes the front opening of the cassette housing.

[Problems to be solved by the invention]

However, each of these prior applications requires a hinge for attaching the support shaft to the upper half, and has a problem that the number of parts and the number of assembling steps are large and the cost is high.

Further, there is a problem that a mold structure for integrally forming the cylindrical portion with the front lid and the hinge formed of a synthetic resin is complicated, and the molding cost is high.

SUMMARY OF THE INVENTION An object of the present invention is to provide a front cover mounting device that can omit hinges and can easily prevent the support shaft from coming off.

[Means for solving the problem]

In order to achieve the above object, a front lid mounting device of the present invention integrally forms a groove and a plurality of projections provided on the side of the groove in an upper half formed of synthetic resin, and fixes a support shaft in the groove. After fitting, the plurality of protrusions are welded on the groove,
The support shaft is held in the groove.

Further, in the front cover mounting apparatus of the present invention, the front cover is formed by pressing a metal plate, a pair of cylindrical portions are integrally formed on the front cover, and both ends of the support shaft are provided in the pair of cylindrical portions. And a pair of caulking portions which caulk outer ends of the pair of cylindrical portions prevent the support shaft from coming off from the pair of cylindrical portions.

(Operation)

In the front lid mounting device configured as described above, the support shaft can be directly mounted on the upper half, so that the hinge required in the prior application can be omitted.

Further, it is possible to easily prevent the support shaft from coming off simply by caulking the outer ends of the pair of cylindrical portions of the front lid formed by pressing the metal plate.

〔Example〕

Hereinafter, an embodiment of a front cover mounting apparatus in which the present invention is applied to a tape cassette for a video tape recorder will be described with reference to the drawings.

First, the entire tape cassette will be described with reference to FIG.

A cassette housing 3 is constituted by upper and lower halves 1 and 2 formed of a synthetic resin. In the cassette housing 3, a magnetic tape 4 is wound and housed on a pair of left and right tape reels 5 and 6. ing. The magnetic tape 4 is stretched along a front opening 7 formed in the cassette housing 3, and is attached to the upper half 1 so as to be rotatable in the directions of arrows a and b around a support shaft 8. , The front opening 7 is opened and closed.

Next, the details of the front lid mounting device will be described with reference to FIGS.

First, as shown in FIGS. 1, 5, and 6, the front lid 9 is formed by pressing a metal plate, and is formed by a horizontal plate portion 9a and a vertical plate portion 9a. The cross-sectional shape is substantially L-shaped. And the rear edge of the horizontal plate portion 9a
A pair of cylindrical portions 11 are integrally formed on the same axis at two places on the left and right of 9c. As shown in FIGS. 5 and 6, both ends 8a of the metal support shaft 8 are inserted into these paired cylindrical portions 11 so as to be approximately half the length of these cylindrical portions 11. A slit 13 is formed at a substantially central portion in the longitudinal direction of the pair of cylindrical portions 11, and a pair of caulkings whose outer ends are caulked radially inward of the cylindrical portion 11 from the slits 13. The pair of caulking portions 14 prevent the support shaft 8 from coming off from the pair of cylindrical portions 11.

At this time, after the support shaft 8 is inserted into the pair of cylindrical portions 11, a method of simultaneously tightening the pair of caulking portions 14, and a method of simultaneously pressing the pair of cylindrical portions 11 with one caulking portion 14. Only after the supporting shaft 8 is inserted into the pair of cylindrical portions 11 from the other caulking portion 14 side, the other caulking portion 14
There is a method of caulking.

Next, as shown in FIGS. 1 to 4, a front opening 7 is cut into a substantially L-shape over the front wall 1a and the top wall 1b of the upper half 1 formed of synthetic resin. I have. A U-shaped groove 16 is formed integrally with the lower surface 1c of the upper surface wall 1b along the edge 1d on the front opening 7 side. A plurality of projections 17 are integrally formed on the lower surface 1c along the sides of the groove 16.

Then, after the intermediate portion 8b of the support shaft 8 attached between the pair of cylindrical portions 11 of the front lid 9 is fitted into the groove 16 as shown in FIG. In the figure, pressure is applied in the direction of arrow c to weld the plurality of projections 17 onto the groove 16 (in this case, the lower surface side of the groove 16) as shown in FIG. The open end 16a of the support shaft 8
Is held in the groove 16.

As described above, as shown in FIG.
Is mounted so as to be rotatable about the support shaft 8 in the directions of arrows a and b.

A spring locking pin 18 formed integrally with the lower surface 1c of the upper half 1 and a spring locking piece 19 formed by pressing the front lid 9 integrally.
The front cover 9 is rotationally urged in the direction of the arrow b, which is the closing direction, by a tension spring 20 whose both ends are locked. A horizontal plate portion 9a of the front lid 9 is horizontally contacted on a pair of lid receiving portions 21 integrally formed on the lower left and right sides of the pair of cylindrical portions 11 of the front lid 9 on the lower surface 1c of the upper half 1. Thus, the front lid 9 is positioned at the closed position of the front opening 7. A locking lever (not shown) provided in the lower half 2 is engaged with a locking claw 22 formed by pressing the front cover 9 integrally with the front lid 9, and the front lid 9 is locked at the closed position of the opening 7. It is configured to be. As shown in FIG. 7, when the unlocking means (not shown) is inserted into the unlocking means insertion hole 23 provided on the front surface of the lower half 2, the locking of the front lid 9 at the closed position is performed. Is released, and the front lid 9 can be opened in the direction of arrow a.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various effective changes can be made based on the technical idea of the present invention.

Also, the present invention is not limited to a tape cassette for a video tape recorder,
The present invention can be applied to tape cassettes for various recording / reproducing apparatuses which record or reproduce according to a reproducing method.

〔The invention's effect〕

The present invention is configured as described above, and has the following effects.

Since the support shaft can be directly attached to the upper half and the hinge can be omitted, the number of parts and the number of assembling steps of the front lid mounting device can be reduced, and the cost can be reduced.

The support shaft can be easily prevented from coming off, and the workability of assembly can be improved.

[Brief description of the drawings]

1 is an exploded perspective view of the entire front lid mounting device, FIG. 2 is a perspective view of the entire front lid mounting device in an assembled state, and FIG. 4 is an enlarged sectional view of a welded portion of the spindle, FIG. 5 is a sectional view of a retaining portion of the spindle, FIG. 6 is a perspective view of a retaining portion of the spindle,
FIG. 7 is a perspective view of the entire tape cassette. In the reference numerals used in the drawings, 1... Upper half 2... Lower half 3... Cassette housing 7... Front opening 8. Intermediate part 9 Front lid 11 Cylindrical part 14 Caulking part 16 Groove 17 Projection.

Claims (2)

(57) [Claims] 1. A tape configured to mount a support shaft on an upper half made of synthetic resin of a cassette housing and to open and close a front opening of the cassette housing with a front lid rotatably mounted around the support shaft. In the cassette, a groove is formed in the upper half and a plurality of protrusions provided on the side of the groove are integrally formed, and the support shaft is fitted into the groove, and then the plurality of protrusions are welded on the groove. A tape cassette front lid mounting device, wherein the support shaft is held in the groove. 2. A shaft is mounted on an upper half of the cassette housing made of synthetic resin, and a front cover rotatably mounted on the shaft is used to open and close the front opening of the cassette housing. In the tape cassette, the front cover is formed by pressing a metal plate, a pair of cylindrical portions are integrally formed on the front cover, and both ends of the support shaft are inserted into the pair of cylindrical portions. A front cover mounting device for a tape cassette, wherein a pair of caulking portions that caulk outer ends of a pair of cylindrical portions are configured to prevent the support shaft from coming off from the pair of cylindrical portions.