JPS6346937Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape locking device used in tape cassettes for video tape recorders and the like.

Conventionally, a tape locking device in such a tape cassette has a structure as shown in FIG.
In Fig. 1, 1 is a reel hub, 2 is a tape,
3 is a clamper as a locking device for attaching this tape 2 to the reel hub 1.

By the way, in such conventional devices,
Since the shape of the clamper 3 is symmetrical, there is no directionality when inserting it, making it easy to insert it, but there is a problem with the clamping force because the insertion force in both directions is the same, and the clamping force on the left and right sides remains the same. However, the drawback was that the clamping force was not very strong.

The present invention solves these conventional drawbacks, and the tape locking device according to the present invention will be described below with reference to FIGS. 2 and 3.

FIG. 2 shows a clamper as a tape locking device according to an embodiment of the present invention. In the figure, reference numeral 4 indicates an outer circumferential portion having a curvature similar to that of the reel hub 1 and a uniform wall thickness, and reference numeral 5 indicates a reinforcing rib provided integrally with this outer circumferential portion 4. By providing a space 6 in the outer peripheral part 4
is given elasticity. 7 and 8 are the reinforcing ribs 5
The locking piece 7 is formed longer than the locking piece 8.

Here, the reinforcing rib 6 has a locking piece 7 on the outer surface of the tip.
8, and extends from the inner surface of the tip of the leg 11 having the long locking piece 7 toward the inner surface of the base of the leg 12 having the short locking piece 8. . Therefore, the space 6 has a tapered shape, being wider on the long locking piece 7 side and narrower on the short locking piece 8 side.

FIG. 3 shows a state in which the clamper shown in FIG. 2 is attached to the reel hub 9. The clamper hooks the tape 10 onto the long locking piece 7 and fitting it into the recess 9a of the reel hub 9, and then inserts the short locking piece 8 into the recess 9b of the reel hub 9. Since this locking piece 8 is short, the clamper can be easily inserted into the reel hub. After this clamper is inserted, when the part 10a of the tape 10 on the locking piece 7 side is pulled, the locking piece 7 is long and the clamping force is strong, so it does not come off easily, but the part of the tape 10 on the locking piece 8 side When 10b is pulled, the locking piece 8 is short and the clamping force is weak, so it can be removed relatively easily. That is, when the portion 10a of the tape 10 is pulled, stress acts on the reinforcing rib 5 in the compression direction due to its shape effect, and when the portion 10b of the tape 10 is pulled, the reinforcing rib 5 is subjected to stress due to its shape effect. Stress acts in the direction of deflection. Therefore, since the reinforcing rib 5 has a larger compression than its deflection force, its length acts to reinforce the clamping force of the locking piece 7, and a stronger clamping force can be exerted. Therefore, by pulling out the tape 10 from the long locking piece 7 side and winding it in the direction of the arrow, an extremely strong clamping force can be obtained.

As described above, the tape locking device according to the present invention not only allows easy installation of the tape, but also has an extremely strong clamping force against tension of the tape, thereby shortening the time required for assembling the tape cassette. This makes it possible to reliably prevent the tape from coming off after it has been attached. Furthermore, since the outer peripheral part has the same radius of curvature as the reel hub and a uniform wall thickness, there is no sink mark or the like caused by molding on the surface, and there is no problem of show-through on very thin tapes. Furthermore, the reinforcing part is provided from the inner surface of the tip of the leg with the long locking piece to the inner surface of the base of the leg with the short locking piece, so that it has a resistance force in the compression direction against the tape tensile force. As a result, the clamping force due to the long locking piece is further strengthened, and a strong clamping force is exerted.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the main structure of a conventional tape cassette, Fig. 2 is a perspective view showing a tape locking device according to an embodiment of the present invention, and Fig. 3 is a tape mounting device using the tape locking device. FIG. 4... Outer periphery, 5... Reinforcing rib, 7, 8...
Locking piece, 9... Reel hub, 10... Tape, 1
1, 12... Legs.

Claims (1)

[Scope of utility model registration request] An outer circumferential portion having a uniform wall thickness and a radius of curvature similar to that of the reel hub, leg portions protruding from both ends of the inner surface of the outer circumferential portion, and legs protruding from the outer surface of the tips of these legs, each of which is provided on the reel hub. locking pieces of different lengths that can be fitted into the recessed portions, and the inner surface of the end of the leg with the long locking piece facing the outer circumferential portion with a space therebetween, and the short locking piece. A tape locking device comprising a reinforcing portion constructed between the provided leg portion and the inner surface of the root portion thereof.