JPH0535514B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape cassette with a lid.

Conventional structure and its problems In recent years, magnetic recording using tape cassettes has been trending towards higher performance and higher recording density, and it has become necessary to prevent dirt, dust, fingerprints, etc. from getting on the tape. Ta. Video cassettes with lids are already in use, but for audio use AB
A device that can be used on both sides, has a simple structure, and can be implemented at low cost is desired.

The structure of a tape cassette with a lid already proposed by the present inventors will be explained below.

Figure 1 is a perspective view of a tape cassette with a lid.
2 is the cassette body, 2 is the upper half of the cassette, 3 is the lower half of the cassette, and 4 is the lid.

FIG. 2 is a partial top view showing the inside, where 5 is the lid side part, 6 is the pivot shaft of the lid 4 provided on the lid side part 5, and 7 is a partial top view showing the inside.
is a fitting hole for the rotation support shaft 6, and has a substantially triangular shape that tapers toward the rear. 8 is the cassette inner wall, 9
is a leaf spring held by the inner wall 8, the free end of which urges the pivot shaft 6 rearward.

FIG. 3 is a partial side view thereof.

The operation of the tape cassette constructed as above will be explained. To open the lid of the cassette in the state shown in FIG. 1, it is sufficient to push up the lower part of the lid 4.

Since the lid 4 is biased rearward by the force of the leaf spring 9, the lid 4 moves upward along the cassette opening surface and rotates clockwise about the upper edge of the opening surface as a fulcrum. When it is rotated by more than 45 degrees, the force of the leaf spring 9 automatically advances the rotation and the cassette is brought into close contact with the upper surface of the cassette. To close it, simply push the rear part of the open lid forward. It moves in the opposite direction to the previous one and closes the opening. Each time the opening and closing are repeated in this manner, the pivot shaft 6 moves along the slope of the fitting hole 7 and bends the leaf spring 9. Since the leaf spring 9 is installed in a narrow space, the arm length of the leaf spring 9 is not sufficient, and there is a problem in that the leaf spring 9 is easily fatigued and loses its spring force after repeated use.

Purpose of the Invention The present invention further improves the tape cassette described above, and provides a tape cassette with a lid that has sufficient arm length even in a small space, has excellent durability, and has a leaf spring that is easy to install and hold. The purpose is to provide

Structure of the Invention The present invention provides a substantially triangular fitting hole which is provided in the cassette body and tapers toward the rear, a lid rotation support shaft that fits into the fitting hole, and a lid rotation support shaft that is directed rearward. A U-shaped or V-shaped folded attached leaf spring that is energized by the cassette body, a protrusion provided on the inner wall surface of the cassette body, a U-shaped protrusion or a spring support shaft provided close to the inner wall surface of the cassette body, and This is a tape cassette equipped with a leaf spring holding means consisting of a protrusion, etc., and by providing a folded part, the length of the spring part of the leaf spring can be increased, eliminating fatigue of the spring and improving the operational feel. In addition to being easy to measure, the spring can be held easily and reliably.

DESCRIPTION OF EMBODIMENTS FIG. 4 is a partial top view showing the inside of a tape cassette according to an embodiment of the present invention, and FIG. 5 is a front view thereof, in which 10 is a leaf spring, 11 is a held portion of the leaf spring 10, and 12 is a 8 is a protrusion provided on the inner wall, 13 is a U-shaped protrusion also provided on the inner wall 8, and 14 is a protrusion 12.
a taper provided on the side facing the U-shaped protrusion 13;
Reference numeral 15 denotes a large diameter portion provided at the tip of the rotation support shaft 6, which contacts the tip of the leaf spring 10, and the tip directly contacts the rotation support shaft to avoid scraping the shaft with the spring tip. . Numeral 16 is a pin installed in the lower half 3 of the cassette to apply preload when the leaf spring 10 is assembled, and to facilitate the work of assembling the lid 4. 17
is a folded portion of the leaf spring 10 and is fitted into a U-shaped protrusion. On the other hand, the other end of the folded part, that is, the part to be held, is in contact with the protrusion 12, and the dead leaf spring is held in the left, right, front, and back directions, and after assembly, the upper and lower half walls ensure that the leaf spring is held in the vertical direction. .

FIG. 6 is a front view of the leaf spring, and 18 is the held part 1.
The tapered part provided at the end of the first half facilitates insertion into the holding part and also facilitates assembly of the upper halves.

Further, the width of the held portion 11 is made wider than that of the spring portion, that is, the movable arm portion 10, so that it does not rub against the upper and lower inner wall surfaces of the cassette when the spring is activated.

FIG. 7 is a top view of a second embodiment of the leaf spring according to the present invention, in which the folded portions are almost in close contact with each other. When such a leaf spring is used, the U-shaped protrusion 13 can be made even smaller, so it is effective to implement it in a small space. or,
A step formed on the inner wall surface and formed on the side surface of the recess can also be used in place of the protrusion.

Note that it is also possible to use the protrusion 12 in such a manner that the protrusion 12 is brought into contact with the intermediate portion of the leaf spring 10 when the deflection of the leaf spring 10 becomes large, so that the spring force thereafter increases rapidly. This provides a more crisp click action when opening and closing the lid.

FIG. 8 is a partial top view of a tape cassette in a second embodiment of the present invention, and FIG. 9 is a front view thereof.
Reference numeral 19 is a spring support shaft mounted on the lower half 3 of the cassette. Reference numeral 20 denotes a projection provided opposite to the spring support shaft 19, and a folded portion 17 is passed between the two to form a leaf spring holding portion together with the cassette inner wall. Reference numeral 21 denotes a stepped portion provided on the lower half of the cassette, which holds the held portion 11 of the leaf spring in a suspended state and prevents the movable portion of the leaf spring 10 from coming into contact with the upper and lower walls of the cassette.

FIG. 10 is a front view of an embodiment of the leaf spring. The stepped portion 21 is provided on the upper and lower halves, and the spring portion 10 can be lifted from the upper and lower inner wall surfaces of the cassette. can be made to have equal width.

FIG. 11 is a partial top view of a tape cassette according to a third embodiment of the present invention. Reference numeral 22 designates a recess provided in the inner wall surface of the cassette body, in which the held portion of the leaf spring 10 is held.

FIG. 12 is a front view of the same, and 23 is a recess provided at the bottom of the recess 22. A similar recess is also provided in the upper half of the cassette, so that the upper and lower ends of the held part 11 fit into it in the front-rear direction. Movement is also regulated.

FIG. 13 is a front view of an embodiment of the leaf spring, and 24 is a tapered portion provided on the held portion 11 to facilitate insertion into a recess provided on the holding portion. Furthermore, after insertion, it matches the taper of the recess provided on the cassette side and is held securely without play.

As described above, according to this embodiment, the leaf spring is provided with a folded part and the part after the folded part is used as a holding part, so the length of the spring part is increased, the degree of freedom in designing the spring is increased, and the spring can be easily removed. It has excellent durability without causing any damage, and is also easy and reliable to hold.

Incidentally, the protrusions constituting the holding portion are normally provided on each of the upper and lower halves, but they may also be provided only on the lower half to improve assembly efficiency.

In addition, the spring portion of the leaf spring is provided with an appropriate curvature to effectively utilize the internal space.
It is also possible to arbitrarily change the relationship between the spring force and the amount of deflection.

Effects of the Invention The present invention provides a substantially triangular fitting hole that tapers toward the rear provided in the cassette body, a lid rotation support shaft that fits into the fitting hole, and a lid rotation support shaft that faces rearward. A U-shaped or V-shaped folded attached leaf spring that is energized by the cassette body, a protrusion and a U-shaped protrusion provided on the inner wall surface of the cassette main body, or a leaf spring support shaft provided close to the inner wall surface of the cassette main body, and By providing a leaf spring holding means consisting of a protrusion and a protrusion, the length of the spring part can be increased even in a narrow space, and the degree of freedom in designing the spring is increased. It is possible to realize a tape cassette with a lid that has excellent operational feel and durability without causing sagging.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a previously proposed tape cassette with a lid, Fig. 2 is a partial top view showing the inside thereof, Fig. 3 is a partial side view thereof, and Fig. 4 is a first embodiment of the present invention. 5 is a front view thereof, FIG. 6 is a front view of a leaf spring, FIG. 7 is a top view of another embodiment of the leaf spring, and FIG. 8 is a top view of another embodiment of the leaf spring. A partial top view of the second embodiment of the present invention, FIG. 9 is a front view thereof, FIG. 10 is a front view of the embodiment of the leaf spring, and FIG. 11 is a partial top view of the second embodiment of the present invention.
A partial top view of the embodiment, FIG. 12 is a front view thereof,
FIG. 13 is a front view of an embodiment of the leaf spring. 1...Cassette body, 2...Cassette upper half, 3...Cassette lower half, 4...Lid, 6...
Lid rotation support shaft, 7... Fitting hole, 10... Leaf spring, 1
DESCRIPTION OF SYMBOLS 1...Holded part, 17... Turned part, 22... Recessed part, 23... Recessed part, 24... Tapered part.

Claims (1)

[Scope of Claims] 1. A substantially triangular fitting hole that tapers toward the rear provided in the cassette body, a lid rotation support shaft that fits into the fitting hole, and a lid rotation support shaft that extends rearward. U is advancing towards
1. A tape cassette comprising a leaf spring with a folded shape or a V-shape, and a leaf spring holding means for holding the part after the folded part to the inner wall surface of the cassette. 2. The tape cassette according to claim 1, wherein a U-shaped projection provided on the inner wall surface of the cassette main body and a projection provided on the inner wall surface opposite thereto constitute a leaf spring holding means. 3. The tape cassette according to claim 1, wherein the leaf spring holding means is constituted by a spring support shaft provided close to the inner wall surface of the cassette main body and a protrusion provided opposite to the spring support shaft. . 4 A recess provided on the inner wall surface of the cassette main body, and a recess provided on the upper and lower walls of the cassette continuously with the recess,
The tape cassette according to claim 1, further comprising a leaf spring holding means. 5. Claim 1 characterized in that when the deflection of the leaf spring increases, the tip of the protrusion provided on the inner wall surface comes into contact with the midpoint of the spring.
Tape cassette as described in section. 6. The tape cassette according to claim 2 or 4, characterized in that the side portion constituting the protrusion or recess is tapered on the surface that engages with the end of the plate spring held portion. 7. The tape cassette according to claim 1, wherein the space for the leaf spring holding portion is narrower on the lower half of the cassette so that the leaf spring holding portion is held on the lower half of the cassette. 8. The tape cassette according to claim 1, characterized in that a contact portion for preloading the spring is provided near the free end of the leaf spring. 9. The tape cassette according to claim 1, wherein the movable arm portion of the leaf spring is provided with a sled in advance toward the rotation support shaft. 10. The tape cassette according to claim 1, wherein the width of the held portion of the leaf spring is wider than that of the movable arm portion. 11. The tape cassette according to claim 1, characterized in that a stepped portion is provided on the upper and lower cassette wall surfaces of the leaf spring holding portion. 12. The tape cassette according to claim 1, wherein a large diameter portion is provided at the tip of the lid rotation support shaft, and a leaf spring is brought into contact with the large diameter portion.