JPH056610Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a tape cartridge equipped with a front cover for protecting the tape, and takes measures to prevent the front cover from deforming and cracking.

[Conventional technology]

4 and 5 illustrate conventional video tape cartridges. There, tape reels 3, 3 on which tape 2 is wound are rotatably arranged on the left and right sides inside a main body case 1 made of plastic. The tape 2 is led out from one tape reel 3 to the front side of the main body case 1 and wound onto the other tape reel 3.

A front cover 4 for covering and protecting the front side of the tape 2 led out from the front side of the main body case 1 is attached to the main body case 1 so as to be openable and closable.

The front cover 4 includes a front plate 4a having a length that closes the front surface of the main body case 1 over the entire left and right length thereof;
A top plate 4 connected to the rear from the upper edge of the front plate 4a
b, and side pieces 4c, 4c connected at right angles to the rear from the left and right ends of the front plate 4a. The left and right side pieces 4c, 4c are stacked on top of each other, and the left and right side pieces 4c, 4c are arranged opposite to the outer surfaces of the left and right side walls 5, 5 of the main body case 1, and the pivots 6, 6 protruding from the left and right side pieces 4c, 4c are attached to the left and right side walls 5,5. They are pivotally connected by fitting into respective shaft holes (not shown) on the sides. The front cover 4 is now able to open and close freely around the pivot 6 between the closed position that covers the front side of the tape 2 and the top open position that opens the front side of the tape 2. It is always urged to close by a spring member (not shown). Between the rear edge of the top plate 4b of the front cover 4 and the rear rising edge 1b of the depressed front end 1a of the top surface of the main case 1, and between the side piece 4c of the front cover 4 and the side wall 5 of the main case 1. A slight clearance is set for each of the front lids 4 in order to smoothly open and close the front lid 4.

[Problem to be solved by the invention] However, during transportation, storage, or handling, impact loads may be applied to the front cover 4 from the external sides P, and in such cases, the side pieces 4c of the front cover 4
The rear rising edge 1b of the depressed front end portion 1a of the upper surface of the main body case 1 is near the continuous portion with the upper surface plate 4b.
The side wall 5c collides with the outer corner where the side wall 5 meets, and the side wall 5c is warped and deformed as shown by the broken line A in FIG. Not only does a cloudy whitening phenomenon occur, which impairs the appearance, but in the worst case, excessive stress concentration occurs at the inner corner where the side piece 4c and the top plate 4b intersect at right angles, resulting in cracks.

In view of this fact, this invention aims to provide a front cover that can be well prevented from deforming or cracking even when subjected to an external impact load, and has excellent impact resistance.

[Means for solving problems]

In order to achieve the above object, the front cover 4 for opening and closing the front side of the main body case 1 has a front plate 4a that covers the front side of the main body case 1, and a front cover 4 for opening and closing the front side of the main body case 1.
a top plate 4b overlapping the top front end 1a of the top surface;
Side piece 4c facing the outer surface of side wall 5 of main body case 1
Then, a fillet part 7 is attached to the inner corner where the rear edge of the top plate 4b and the side piece 4c intersect, while the outer part of the upper surface of the main body case 1 corresponding to the inner corner is A chamfer 8 having a shape corresponding to the fillet portion 7 is provided at the corner.

Here, the fillet portion 7 is made flat;
Alternatively, it is optional to make it round. Of course, in this case, the chamfer 8 can also be flat or rounded depending on the fillet 7.

[Effect of idea]

According to the present invention configured as described above, the front cover 4
Since the fillet 7 is provided at the inner corner where the rear edge of the top plate 4b and the side piece 4c intersect, excessive concentrated stress on the side piece 4c due to external impact loads can be sufficiently avoided, thereby increasing the strength. Moreover, since a chamfer 8 corresponding to the fillet 7 is provided on the outer corner of the main body case 1, even if the front cover 4 is elastically deformed due to external force, the gap between the fillet 7 and the chamfer 8 will be maintained. Since the side pieces 4c come into surface contact, concentrated stress can be effectively removed, and deformation and cracking of the side pieces 4c can be prevented.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 and 2.

The overall structure of the tape cartridge is substantially the same as that of the conventional tape cartridge described above, so only the differences from the conventional front cover 4 and main body case 1 will be described.

The front cover 4 is a plastic molded product, and includes a front plate 4a that covers the front surface of the main body case 1 over the entire left and right length thereof, and a front plate 4a that extends rearward from the upper edge of the front plate 4a at right angles to the upper surface of the main body case 1. a top plate 4b that covers the front end of the front plate 4a; and side pieces 4c arranged rearward from the left and right ends of the front plate 4a at right angles and arranged opposite to each other on the outer surface side of each front end 5a of the left and right side walls 5, 5 of the main body case 1; 4c, and a flat fillet 7 is integrally provided at the inner corner where the rear edge of the top plate 4b intersects with the upper ends of the left and right side pieces 4c. On the other hand, a chamfer 8 corresponding to the fillet 7 is provided at the outer corner where the rear rising edge 1b of the depressed front end 1a of the upper surface of the main body case 1 meets the upper end of the side wall 5.
However, a clearance is provided between the front cover 4 and the main body case 1 within dimensional tolerances in order to facilitate the opening and closing operation of the front cover 4, as described above.

In such a case, even if an external force is applied to the front cover 4 from the direction P in FIG. 2 and the front cover 4 is elastically deformed to eliminate the clearance between the fillet 7 and the chamfer 8, the fillet 7 Since the chamfers 8 and 8 are in surface contact, stress concentration is avoided, and deformation and cracking of the side pieces 4c are eliminated.

[Another example]

FIG. 3 shows another embodiment of the present invention, in which the fillet 7 on the front lid 4 side is rounded, and the chamfer 8 on the main body case 1 side is also rounded accordingly. In this case, as in the case of the above embodiment, the side piece 4c of the front cover 4 resists the external force from the P direction.
Deformation and crack occurrence could be well avoided.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the tape cartridge according to the present invention, with FIG. 1 being an overall plan view and FIG. 2 being an enlarged plan view of the main parts. FIG. 3 is an enlarged plan view of main parts showing another embodiment of the present invention. 4 and 5 show a conventional tape cartridge, with FIG. 4 being an overall plan view and FIG. 5 being an enlarged plan view of the main parts. 1...Body case, 2...Tape, 3...Tape reel, 4...Front cover, 4a...Front plate, 4b...
...Top plate, 4c... Side piece, 5... Side wall, 7... Fillet, 8... Chamfer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The front cover 4 that opens and closes the front side of the main case 1 overlaps the front plate 4a that covers the front of the main case 1 and the depressed front end 1a of the upper surface of the main case 1. It has a top plate 4b and a side piece 4c facing the outer surface of the side wall 5 of the main body case 1, and a fillet part 7 is attached to the inner corner where the rear edge of the top plate 4b and the upper edge of the side piece 4c intersect, A tape cartridge characterized in that a chamfer 8 having a shape corresponding to the fillet portion 7 is provided at the outer corner of the upper surface of the main body case 1 corresponding to the inner corner. (2) The tape cartridge according to claim (1) of the utility model registration, in which the fillet portion 7 is rounded. (3) The tape cartridge according to claim (1) of the utility model registration, in which the fillet portion 7 is flat.