JP2939951B2 - Mold device for molding cassette tape storage case and its base - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette tape storage case and a mold device for molding the base thereof.

[0002]

2. Description of the Related Art As shown in FIG. 8, an audio cassette tape storage case is provided on a base 1 which is a resin molded product.
A cover 2, which is also a resin molded product, is hinged by a hinge 3 so as to be freely opened and closed. The base 1 includes a rectangular base surface portion 4, a front side surface portion 5 vertically bent in the same direction from the front edge and left and right side edges of the base surface portion 4, and a pair of lateral side surface portions 6. It has a box shape. A concave finger holding portion 7 for hanging a finger when opening the storage case is formed on a front edge side of an outer surface of the front side surface portion 5. The finger hook 7 is conventionally set to a shape that does not cause undercut during molding. That is, it has a triangular cross-section such that the depth gradually increases from the base surface portion 4 side to the opposite base surface portion 4 side.

[0003] The base 1 has conventionally been formed using a mold apparatus as shown in FIGS. 6 and 7.
In these figures, reference numeral 11 denotes a fixed-side mold member, and 12 denotes a movable-side mold member. These mold members 11 and 12 move upward and downward in the drawing to open and close with respect to each other. A cavity 13 having the shape 1 is formed inside. In the cavity 13, the fixed mold member 11 forms the outer surface of the base 4 and the side surfaces 5, 6 of the base 1, and the movable mold member 12 forms the base 4 and the side surfaces 5, 6. And the finger hooks 7 of the front side surface portion 5 are formed, and both the mold members 11 and 12 are set so as to relatively move in a direction orthogonal to the base surface portion 4. Further, a bush 16 having a gate 14 opening to the cavity 13 at its tip and containing a spear 15 and the like is embedded and fixed in the fixed mold member 11. Further, the movable mold member 12 is provided with a protruding pin 17 for releasing the base 1, which is a molded product, when the mold is opened, so as to be vertically slidable in the drawing. Then, at the time of molding, with the mold closed, the gate from inside the bush 16
The molten resin is poured into the cavity 13 through 14. Next, after the resin filled in the cavity 13 is solidified, the mold is opened. At this time, due to shrinkage of the molded product, which is a resin solidified in the cavity 13, the molded product,
First, stop on the movable-side mold member 12 and move to the fixed-side mold member.
Leave 11 Furthermore, as the mold opening progresses, the movable mold member
The base 1 is separated from the movable-side mold member 12 by the protruding pins 17 which rise relative to the figure 12.

[0004] By the way, due to design requirements, a crimp may be formed on the outer surface of the base 1. When the grain is formed not only on the outer surface of the base surface portion 4 but also on the outer surfaces of the side surface portions 5 and 6, it hinders release of the base 1 from the fixed mold member 11. Therefore, as the grain becomes coarser,
The draft of 6 must be large. However, there is a limit to increasing the draft angle, and even if the draft angle is set, the grain is resistant to release from the fixed mold member 11. Therefore, as shown in FIG.
When the mold is opened, the frictional force generated by the grain causes the base 1, particularly the vicinity of the front side surface 5, not to stop on the movable mold member 12, but once to the fixed mold member 11, Due to the resistance applied from the movable-side mold member 12 to this portion, the phenomenon of returning to the movable-side mold member 12 side occurs. However, when the base 1 partially rotates and reciprocates when the mold is opened, the grain on the side surface portions 5 and 6 of the base 1 rubs against the mold members 11 and 12 and is damaged.

[0005]

As described above, in the conventional cassette tape housing case in which a crimp is formed on the entire outer surface of the base, when forming the base, the frictional force generated by the crimp causes the base to lose its shape. In particular, a phenomenon occurs in which the vicinity of the side surface portion once reaches the fixed mold member and then returns to the movable mold member side, so that the grain on the outer surface of the base is easily damaged.

SUMMARY OF THE INVENTION The present invention is intended to solve such a problem. When molding the base of a cassette tape storage case, it is possible to prevent a grain formed on an outer surface including a side portion of the base from being damaged. The purpose is to prevent it.

[0007]

In order to achieve the above object, a cassette tape storage case according to the present invention is characterized in that:
A base and a cover pivotally attached to the base so as to be openable and closable. The base includes a base surface, a front side surface bent perpendicularly in the same direction from a front edge and left and right side edges of the base surface and a pair of and almost box-shaped and a lateral side portion, and having a grain on the base surface and the outer surface of each side portion, wherein the outer surface on the end edge of the counter base side portion of the front side portion
Has a finger hook concave exiting, the finger hook portion, the depth dimension
Law gradually deepens from the opposite base side to the base side
And the part with the largest depth dimension is on the edge on the base side.
It has a certain undercut shape.

[0008] The base of the molding die apparatus of the cassette tape storage case of the present invention of claim 2, serial to claim 1
Of the base of the cassette tape storage case
That open and close to each other and have the shape of the base when the mold is closed.
Forming a cavity filled with molding compound
A plurality of mold members are provided, and as these mold members, an outer surface of a base surface portion and each side surface portion is formed, and the cavity is opened when the mold is opened.
A first mold member that first separates from a base where the molding material is solidified in the first mold member; and a first mold member that is movable in a direction orthogonal to the base surface portion with respect to the first mold member, and is provided with a base surface portion and each side surface portion. A second mold member forming an inner surface, and the second mold member
Assembling to be movable in the direction you perpendicular to the base of the front face portion
Vignetting forming a finger hook portion of the undercut shape mold opening
Third of Ru away from the base during subsequent to the first mold member
And a mold member.

[0009]

[Action] In the cassette tape storage case of the present invention of claim 1, when forming the base <br/> over scan using a plurality of die member for opening and closing each other, A In the outer surface of the front side portion Nda By using the concave finger hook part in the cut shape, when the mold is opened , the mold member that forms the outer surface of the base surface part with the grain and the outer surface of each side part separates from the molded base.
It is possible to prevent the base from loosely moving against the mold member against the frictional force generated by the grain, thereby preventing the grain from being damaged.

That is, when the above-described base is molded by using the molding apparatus for molding the base of the cassette tape storage case of the present invention, the first mold member and the second mold member movable in directions orthogonal to each other with respect to the base surface portion. by the second mold member, the base surface and an inner surface so as to form respective outer surface and the base surface and each side portion of each side portion, a third mold member movable in a direction you perpendicular to the front face portion The first mold member and the second mold member are fixed to each other in an initial stage of mold opening of the first mold member and the second mold member. By allowing the third mold member to bite into the finger hook having an undercut shape with respect to the mold opening direction, the base resists the frictional force generated by the grain, so that the base has the second mold member and the third mold member. Stops securely on the mold member side.
Away from the mold member.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 4 shows a cassette tape storage case according to the present embodiment.
The hinge 22 is pivotally connected to the hinge 22 so as to be openable and closable.
The base 21 includes a base surface portion 24, a front side surface portion 25 and a pair of lateral side surface portions 26 bent perpendicularly in the same direction from the front edge and left and right side edges of the base surface portion 24. It is in shape. Moreover, anti-group of the outer surface of the front side surface portion 25
On the front edge side, which is the side of the surface portion 24, a concave finger hook 27 is formed which extends to the front edge . The finger hook 27 has a triangular cross-section so that the depth gradually decreases from the base surface 24 side toward the base surface 24 side, which is the opening side of the base 21 .
The portion having the largest depth dimension is located at the edge on the base surface portion 24 side . That is, the finger hook portion 27 has an undercut shape in the direction from the base surface portion 24 side to the opposite base surface portion 24 side along the side surface portions 25 and 26. Further, a grain having a roughness of, for example, about 6 μm is formed on the entire outer surface of the base surface portion 24 and the side surfaces 25 and 26.

Next, the construction of a mold apparatus for molding the base 21 of the cassette tape storage case will be described with reference to FIGS. In these figures, 31 is a fixed mold member (first mold member), 32 is a movable mold member (second mold member), and 33 is a slide core (third mold member). is there. The fixed mold member 31 and the movable mold member 32 include:
They move up and down in the figure to open and close. Further, the slide core 33 is mounted on the movable mold member 32 so as to be movable in the left-right direction in the figure. An angular pin 34 fixed to the fixed-side mold member 31 and inclined in a downward direction toward the right in the figure is slidably inserted into a through hole 35 formed in the movable-side mold member 32. Accordingly, the slide core 33 is driven in the left-right direction in the figure in conjunction with opening and closing of the fixed mold member 31 and the movable mold member 32. The diameter of the through hole 35 is slightly larger than that of the angular pin 34, and a gap 35a is formed on the right side in the drawing between the outer peripheral surface of the angular pin 34 and the inner peripheral surface of the through hole 35 during mold clamping. Is to occur. Thus, at the time of mold clamping, a cavity 36 having the shape of the base 21 is formed between the fixed mold member 31, the movable mold member 32 and the slide core 33. Then, in the cavity 36, the fixed-side mold member
31 forms the outer surface of the base surface 24 of the base 21 and the side surfaces 25 and 26, and the movable mold member 32 includes the base surface 24 and the respective side surfaces.
The slide core 33 forms the finger hook 27 while forming the inner surfaces of 25 and 26. Also, the fixed side mold member
The opening and closing directions of the movable mold member 31 and the movable mold member 32 are orthogonal to the base surface portion 24, and the moving direction of the slide core 33 is orthogonal to the front side surface portion 25. Further, a bush 39 having a gate 37 opening to a cavity 36 at the tip and having a built-in spear 38 and the like is embedded and fixed in the fixed mold member 31. Further, the movable side mold member 32 is provided with a protruding pin 40 for releasing the base 21 which is a molded product when the mold is opened, so as to be vertically slidable in the figure.

Next, the operation of the above configuration will be described. At the time of molding the base 21, the mold is clamped as shown in FIG.
A molten resin as a molding material is poured into 36. Next, after the resin filled in the cavity 36 is solidified, the fixed mold member 31 and the movable mold member 32 are opened. In the initial stage of mold opening, the angular pin 34
A gap 35a is provided on the right side of the drawing between the outer peripheral surface of the
As shown in FIG. 2, the movable side mold member
The slide core 33 does not move with respect to 32, and only the fixed mold member 31 is separated from the movable mold member 32 and the slide core 33. At this time, the slide core 33 bites into the finger hook portion 27 which is undercut in the mold opening direction of the movable mold member 32 and the slide core 33 and the fixed mold member 31, so that the The base 21 securely stops on the movable mold member 32 and the slide core 33 side against the frictional force generated by the grain formed on the outer surface of the face portion 24 and the side surfaces 25 and 26, and the fixed mold member Leave 31. After the gap 35a on the right side in the drawing between the outer peripheral surface of the angular pin 34 and the inner peripheral surface of the through hole 35 has disappeared, as shown in FIG. 3, the fixed mold member 31 and the movable mold member 31 are moved. In conjunction with the mold opening with 32, the slide core 33 moves to the right in the figure,
The user separates from the base 21 and gets out of the finger hook 27. Further, after the slide core 33 comes off from the finger hook portion 27, the protruding pin 40 rises in the drawing with respect to the movable mold member 32, and the base 21 is protruded from the movable mold member 32 by the protruding pin 40 and separated. .

As described above, according to the configuration of the above-described embodiment, the concave finger hook portion 27 of the front side surface portion 25 of the base 21 is moved in the mold opening direction of the fixed mold member 31 and the movable mold member 31. To the undercut shape, and this finger hook 27 is fixed mold
The slide core 33 that separates from the base 21 after the member 31
When the mold is opened, the base 21
It is possible to prevent a phenomenon in which the part 21 once reaches the fixed mold member 31 and then returns to the movable mold member 32 side. Therefore, especially the side portion 2 of the base 21
The grain of 5, 26 can be prevented from being rubbed and damaged by the mold members 31, 32.

The present invention is not limited to the above embodiment, but can be variously modified. For example ,
In the previous SL embodiment, such has formed the finger hook portion 27 of the elongated one to the tip edge of the front side portion 25 of the base 21, finger grips 27 pair formed on an end edge of the front side portion 25 of the base 21 You may.

[0016]

According to the present invention, in a cassette tape storage case having a crease on the outer surface of the base surface of the base and each side surface, the base is formed on the outer surface of the front side and opposite to the base surface.
Finger hook portion has a depth dimension counter base surface concave exit to the edge of
The depth gradually increases from the side to the base side
The undercut shape with the largest dimension at the base surface side edge is used. By using this undercut finger hook, a plurality of dies that open and close with each other
When forming the base with a member, at the time of mold opening,
It is possible to prevent the base from floating with respect to the mold member against the frictional force generated by the grain, thereby preventing the grain from being damaged.

That is, a first mold member that forms the outer surface of the base surface and each side surface, and a first mold member that is movable with respect to the first mold member in a direction orthogonal to the base surface and is formed of the first surface. The inner surface is formed first from the base formed when the mold is opened.
A second mold member Ru away, based on the second die member
Base next to the first mold member to the front side portion in the direction you orthogonal assembled movably finger <br/> hooking portion formed mold opening time of
Using the molding die apparatus and a third mold member Ru away from the mold to open the early stages of, the third die member bites into the finger hook portion, molded base of the second Since it is securely stopped on the mold member side and is released from the first mold member, it is possible to prevent the base from floating with respect to the mold member and damaging the grain.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of a mold apparatus for molding a base of a cassette tape storage case according to the present invention in a mold-clamped state.

FIG. 2 is a cross-sectional view of an initial stage of opening the mold.

FIG. 3 is a cross-sectional view showing a state in which the mold opening is further advanced.

FIG. 4 is a perspective view of the cassette tape storage case.

FIG. 5 is a sectional view of an example of a conventional mold apparatus for molding a base of a cassette tape storage case in a mold-clamped state.

FIG. 6 is a cross-sectional view of the same mold open state.

FIG. 7 is a perspective view of the cassette tape storage case.

[Explanation of symbols]

21 Base 22 Cover 24 Base surface part 25 Front side surface part 26 Side side surface part 27 Finger part 31 Fixed mold member (first mold member) 32 Movable mold member (second mold member) 33 Slide core ( Third mold member) 36 cavities

Claims (2)

(57) [Claims] 1. A base comprising: a base; and a cover pivotally attached to the base so as to be openable and closable. The base includes a base surface, and a front surface which is vertically bent in the same direction from a front edge and left and right side edges of the base surface. It is substantially box-shaped having a side surface portion and a pair of lateral side surface portions, and has a crevice on the outer surface of the base surface portion and each side surface portion, and an opposite base surface on an outer surface of the front side surface portion.
A concave finger hook that extends to the edge on the side of the hook, and the finger hook has a depth dimension from the opposite base face side to the base face side.
The deepest part and the part with the largest depth dimension is the base surface
A cassette tape storage case, which has an undercut shape at an edge of the cassette side. 2. A mold device for molding a base of a cassette tape storage case according to claim 1, wherein said mold device is opened and closed with respect to each other.
Key that has the shape of the base during mold clamping and is filled with molding material.
A plurality of mold members for forming cavities between each other.
The outer surfaces of the base surface and the side surfaces are formed as these mold members , and the molding material is not solidified in the cavity when the mold is opened.
A first mold member that is initially separated from the base,
A second mold member movable in a direction orthogonal to the base surface portion with respect to the mold member and forming inner surfaces of the base surface portion and each side surface portion; and a front side surface portion of the base provided on the second mold member. And orthogonal
The undercut mounted to be movable in the direction you
Forming a finger-hook portion having a shape to the first mold member when the mold is opened
Then based molding die apparatus of the cassette tape storage case, characterized in that a third mold member Ru away from the base.