Dynamic magnetic information storage or retrieval – Record medium – In container
Patent
1988-04-22
1990-08-21
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Record medium
In container
242199, G11B 23087
Patent
active
049511670
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a magnetic tape cassette for insertion in a video tape recorder (VTR) with its front portion facing the VTR and, more particularly, to a hingelike structure of the front cover mounted on the front portion of the cassette body.
PRIOR ART
FIGS. 45-50 show a conventional magnetic tape cassette for home use, FIG. 45 shows a rear view with a partial cutout viewed from the lower half side of the magnetic tape cassette, FIG. 46 is a cross-sectional view taken on line X III--X III of FIG. 45, FIG. 47 is a partially cut view taken on line X IV--X IV of FIG. 45, and FIG. 48 is a partial view of a corner portion of a lower half corresponding positionally to a cutout at the top of the left side of FIG. 45.
Cassette body 4 of magnetic tape cassette 1 is composed of upper half 2 and lower half 3. There are provided in cassette body 4 a pair of reels around which magnetic tape 5 is wound, one of which is supply reel 6 and the other is take-up reel 7. On the front of cassette body 4 to be inserted into a VTR with its front facing the VTR, there is provided front cover 8 that covers magnetic tape 5 fed from reel 6 onto reel 7 and running on the front face of tape guide means 4a, 4a so that the front cover can be opened and closed.
On the front of cassette body 4, there are provided guide groove 4b to engage an actuator of the VTR to open front cover 8, cutout 4c to accept a pinch roller, and cutouts 4d and 4e to accept a loading mechanism. Tape guide portions 4a, 4a are located between cutouts 4c and 4d and between 4d and 4e respectively.
Front cover 8 is in a flat U-shaped form with its side plates 8c and 8d extending at both sides of front plate 8a and top plate 8b. Inside of side plate 8d, rotating pivot 10 protrudes therefrom and is inserted and supported in the through hole on the front portion of the side wall of upper half 2.
Rotating shaft 9 projects inside of side plate 8c, and is longer, than rotating pivot 10 and protrudes thereform. Front cover spring 12 in a coil form is attached to the rotating shaft 9, so that front cover 8 is urged toward the closed position.
Front cover spring 12 is mounted so that coil portion 12a is surrounds rotating shaft 9, fixed end 12b is hooked on hook pin 13 on rotating shaft 9, and free end 12c loosely engages guide groove 14 formed on the internal surface of upper half 2.
A the portion of side wall 2a of upper half 2 corresponding positionally to side plate 8c of the front cover 8 on which rotating shaft 9 is provided, there is also provided side recess 17 adapted to accept side plate 8c as shown in FIG. 50. Loading opening 11 is located inside the recess 17 to accept the rotating shaft 9
Front cover 8 can be mounted on upper half 2 as shown in FIG. 49 by inserting side plate 8c into side recess 17 after hooking spring 12 on rotating shaft 9. Under such arrangement, however, rotating shaft 9 is not supported firmly because front section 2c of upper half 2 is only in contact with section 8b and free end 12c of front cover spring 12 in the vicinity of side plate 8c as shown in FIG. 46. Rotating shaft 9 can be positioned between upper half 2 and lower half 3.
As shown in FIG. 47, side wall 3c, which is substantially complementary to loading opening 11, is located at the front portion of the side wall of the lower half 3 corresponding positionally to loading opening 11.
Lower opening 18 is above side wall 3c and corresponds to the corner section of loading opening 11. Only when lower opening 18 and the corner portion of loading opening 11 are assembled, loading hole 19 can pivotally support rotating shaft 9.
Hence, when front cover 8 is just mounted on upper half 2, side plate 8c and its surrounding portions are caused by the force of front cover spring 12 to be in contact only with upper half 2, thus, rotating shaft 9 is neither positioned at the prescribed location nor supported because there are no members which restrict the its movement.
The correct positioning of the rotating shaft 9 is effected by the formation of loa
REFERENCES:
patent: 4739432 (1988-04-01), Meguro
Hiramoto Tsutomu
Hirose Kimimoto
Komeiji Masayuki
Okubo Hitoshi
Sato Minoru
Bierman Jordan B.
Heinz A. J.
Konica Corporation
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