JPH0418138Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tape cassette equipped with a dustproof slide cover, and is suitable for application to, for example, a digital audio cassette.

[Prior art]

In recent years, small tape cassettes equipped with dustproof slide covers have been developed and proposed for use in digital audio, for example.

In this tape cassette, as shown in FIG. 3, a dustproof slide cover 3 is supported so as to slide back and forth relative to the case body, and is stopped at a predetermined position.

To explain this in more detail, as shown in FIGS. 3 and 4, the slide cover 3 is always moved in the direction of arrow A (when the lid is closed The closing position of the lid is determined by the claws 6b and 7b at the ends of the stoppers 6 and 7, one end of which is integrally molded with the lower case 2, located on the rear side of the slide cover 3. It is designed to be positioned by fitting into the holes 3a' and 3b'.

On the other hand, the opening stop positions of the stoppers 6 and 7 are such that the claws 6b and 7b are connected to the positioning holes 3a' and
Positioning hole 3a provided on the front edge side of 3b',
It is positioned by fitting into 3b.

The stoppage of the slide cover 3 at the closed lid stop position and the opened lid stop position is automatically released by pressing the claw portions 6b, 7b.

Therefore, the conventional stoppers 6, 7 are
As shown in FIG. 5 and FIG. 5, the arms 6a, 7a are formed long and have the same thickness, and the claws 6b, 7b are only provided at the tips of the arms 6a, 7a.
a is parallel to the slide cover 3 (fourth
(see figure), or so as to be inclined toward the slide cover 3 side (see figure 5).

[Problem that the invention attempts to solve]

By the way, in the above-described conventional tape cassette, when the slide cover 3 is stopped in the open state, the claws 6b fitted into the positioning holes 3a and 3b as shown in FIGS. 4 and 5. ,7b
A force in the direction of arrow P is applied from the slide cover 3 to the side surface of the slide cover 3 due to the spring force of the spring member 4. This force is relatively large, and in the tape cassette shown in FIG. 4, the claws 6b and 7b are easily moved as shown by the chain lines. That is, stopper 6,
Since the directions of the force P acting on the base of 7 and the claws 6b, 7b are not on the same line, the force P on the claws 6b, 7b is
When this is applied, a rotational moment is generated in the stoppers 6, 7, and the claws 6b, 7b receive a force in the direction of being removed from the holes 3a, 3b, so that they tend to move as shown by the dashed lines.

The disadvantage that the claws 6b, 7b separate from the positioning holes 3a, 3b can be overcome by forming the hole diameters of the positioning holes 3a, 3b to match the diameters of the claws 6b, 7b. , 7b into the positioning holes 3a, 3b is not only difficult to do and cannot be done reliably, but also the claws 6b, 7 when the tape cassette is loaded into the cassette deck.
This has the disadvantage that it becomes difficult to release b.

On the other hand, in the tape cassette shown in FIG. 5, although the locking force of the claws 6b, 7b is sufficient, the amplitude of the claws 6b, 7b when engaging and disengaging becomes large, so that the arm parts 6a, There was a drawback that part of 7a and the base of stoppers 6 and 7 were easily broken.

The present invention has been made in view of the above circumstances, and the slide cover 3 is reliably held in a predetermined opening/closing position, and the stoppers 6 and 7 do not deteriorate due to engagement with the positioning holes. , 7, which is easy to mold, assemble, and adjust.

[Means and actions for solving problems]

The present invention provides a tape cassette in which the slide cover is stopped at a predetermined position by fitting the claw portion of the stopper into the stop positioning hole of the slide cover that slides in the front-rear direction with respect to the case body. A convex portion is formed near the claw portion of the stopper so as to come into contact with the back surface of the dustproof slide cover at the stop position of the slide cover to prevent the stopper from restoring.

According to this, when the claw part is fitted into the stop positioning hole, the stopper performs a locking action with a restoring force in the fitting direction, so that the slide cover is reliably held in the open state. It turns out.

〔Example〕

1 to 3 show an embodiment of a tape cassette according to the present invention. FIG. 1 is a perspective view of the tape cassette seen from the back side, and FIG. 2 is a vertical sectional view of the main part of the stopper when the slide cover is stopped in the closed state. In Figure 1, 1 and 2 are an upper case and a lower case that together constitute the case body, and inside the case body is a pair of rotatably supported hubs and a magnetic field wound around the hubs. Contains tapes, etc.

Reference numeral 3 denotes a dustproof slide cover having a U-shaped cross section to prevent dust from entering through the opening of the case body, and gripping claws 3c for sliding that grip the lower case 2 face inward from the lower ends on both the left and right sides. This allows the slide cover 3 to slide in the front-rear direction along the lower case.

Further, this slide cover 3 is constantly biased in the direction of arrow _P1 by a spring member 4 attached to the lower case 2, and when the tape cassette is removed from the deck, the hub holes 5, 5 of the lower case 2
When the tape cassette is closed and the tape cassette is loaded onto the deck, it is pushed in the direction opposite to the arrow _P1 to open the lid and open the hub holes 5 and 5'.

Reference numerals 3a and 3a' are positioning holes used to stop the slide cover 3 at predetermined open/close positions, and are bored in the vicinity of the right side on the surface of the slide cover 3, spaced apart from each other in the front and rear.

Reference numerals 3b and 3b' designate positioning holes that are bored in the vicinity of the left side of the surface of the slide cover 3, spaced apart from each other in the front and back, and are formed for the same purpose as described above.

Reference numerals 6 and 7 indicate stoppers for stopping the slide cover 3 at predetermined opening and closing positions, and one end thereof is integrally molded with the lower case 2. As shown in FIG. 2, this stopper 6 has a long plate-shaped arm portion 6a that is cantilever-supported by the lower case 2, and is protruded toward the slide cover 3 side at the tip of the arm portion 6a. 3a', and in the free state of the fulcrum O, the claw part 6b is bent so as to take a position further upward than in the illustrated state, but in the assembled state shown in the figure, its elastic force The claw portion 6b is pushed down against the slide cover 3.
It is restrained and locked to the edge of the hole 3b. Therefore, in the stopper 6, a preload force is generated when the claw portion 6b is locked in the hole 3b portion as indicated by the arrow.
It is shaped so that a force F ₃ in the P ₃ direction acts on it.
On the other hand, the claw portion 6b is connected to the positioning holes 3a, 3a', 3
b, 3b', a rotational moment is generated in the claw part 6b about the base (fulcrum O) of the arm part 6a by the pushing force of the spring member 4 of the slide cover 3. A force F ₁ in the P ₁ direction is applied to cause the claw portion 6b to come out of the hole 3a. Therefore, the arrow P ₂ acting on the claw portion 6b by the force F ₁ in the P ₁ direction
arrow due to the force F ₂ in the direction and the stopper 6 itself
A force F ₃ in the P ₃ direction will act on it. Further, the claw portion 6b is pushed by the cover 3, so that the claw portion 6b is pressed by the cover 3.
Deformation occurs near b, and this deflection generates a force F ₄ in the P ₃ direction due to internal stress.

6c is a convex portion that is integrally provided between the arm portion 6a and the claw portion 6b and projects toward the claw portion 6b side,
This is to suppress the force in the _P2 direction acting on the claw portion 6b. It is. Reference numeral 7 designates a stopper having an arm portion 7a, a claw portion 7b, and a convex portion 7c and having the same structure as the stopper 6, and 8 a lid.

Next, the claws 6b, 7b are aligned with the positioning holes 3a, 3.
a′, 3b, and the convex portion 6c when fitted into 3b′,
The action of 7c will be explained. The claw portions 6b, 7b
As described above, the spring member 4 whose claw portions 6b and 7b are separated from the positioning holes 3a, 3a', 3b, and 3b'
Force in direction P ₂ through cover 3 due to spring force F ₂
A force F ₃ in the direction P ₃ is acting due to the elastic force of the stopper 6 which has been elastically deformed in advance to suppress the force F ₂ . Further, the convex portions 6c, 7c are pushed by the back surface of the slide cover 3 that comes into contact with them, and the claw portions 6b, 7c are pressed.
7b is deflected, and the internal stress of the deflection generates a force F ₄ in the P ₃ direction. Thus F ₃
The dimensions and shapes of the arm portions 6a and 7a that allow F ₃ to be set such that +F ₄ >F ₂ may be determined. In this way, the force _F2 in the direction in which the claws 6b, 7b disengage is suppressed, and the engagement of the claws 6b, 7b with the positioning holes 3a, 3a', 3b, 3b' becomes more reliable. As a result, the locking function of the stoppers 6 and 7 to the slide cover 3 is strengthened.

Moreover, these convex portions 6c, 7c not only serve as reinforcing ribs for the claw portions 6b, 7b, but also serve as reinforcing ribs for the claw portions 6b, 7b.
The clearance between the slide cover 3 and the lower case 2, which is one of the causes of separation of the slide cover 7b from the positioning holes 3a, 3a', 3b, and 3b', can be made larger than that of the conventional one, and their dimensions, Assembly precision can be relaxed.

Moreover, the arm parts 6a and 7a are provided with positioning holes 3 for closing the lid.
They are formed with the same thickness on a line connecting a', 3b' and positioning holes 3a, 3b for opening the lid, and the spring member 4 is a single leaf spring fixed to the lower case. The claw portions 6b, 7b are located in the positioning holes 3a, 3.
Although it is formed into an angular shape according to the drilling angles of a', 3b, and 3b', the present invention is of course not limited to these shapes and positions.

[Effect of idea]

According to the tape cassette of the present invention, the slide cover is reliably positioned as described above, and there is no inadvertent positional shift during actual use, making it extremely safe and reliable. It has the following advantages.

[Brief explanation of the drawing]

1 and 2 show a tape cassette according to the present invention, FIG. 1 is a perspective view of the tape cassette seen from the back side, and FIG. 2 is a vertical sectional view of essential parts such as a stopper with the slide cover in the closed state. 3 to 5 show a conventional tape cassette,
FIG. 3 is a perspective view of the tape cassette seen from the back side, and FIGS. 4 and 5 are longitudinal sectional views of the stopper when the slide cover is in a stopped state. 1...Upper case, 2...Lower case, 3...Dustproof slide cover, 3a, 3a', 3b, 3b'...
...Positioning hole, 6,7...Stopper, 6b,7
b...claw portion, 6c, 7c...convex portion.

Claims (1)

[Scope of utility model registration request] a dustproof slide cover that is slidably supported back and forth on a case body that stores a magnetic tape, and is provided with a positioning hole that determines the stop position when the lid is opened and a positioning hole that determines the stop position when the lid is closed; a pressing means for urging the slide cover in the closing direction;
One end is integrally formed with the lower case, and the claw portion formed at the tip is provided with a stopper that can be fitted into the positioning hole of the slide cover, and the dustproof slide cover is placed in a predetermined position by fitting the claw portion into the positioning hole. In a tape cassette that is configured to stop at a stop position, the stopper is provided with a stopper near the claw portion so as to maintain an elastically deformed state against the elastic force of the stopper by coming into contact with the back surface of the slide cover at the stop position of the slide cover. A tape cassette characterized in that a convex portion is formed to prevent the slide cover from restoring in the middle.