JPH10324386A - Cassette tape storage case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely secure enough weld strength and a predetermined housing dimension of the inside and to improve an outer appearance without weld dislocation owing to buckling of a weld. SOLUTION: The peripheral end parts of an upper box member 1a and a lower box member 1b are provided with welds 15a-15d, of which facing and joining parts are to be heat welded by supersonic waves. As to the welds 15a-15d, the member of the upper box member 1a is formed in an L shape and the lower box member is formed in an L shape opposite to the L-shaped part of the upper box member 1a to be joined in a hook shape, and one side of the L-shaped part of the lower box member 1b and the upper box member 1a is formed with a rib for welding. In this case, the L-shaped protrusion 16a, 16b, 18a, 18b of the weld 15a-15d and the rib for welding are formed inversely to offset the stress which is the excess pressure of the weld hone and prevents weld dislocation owing to buckling to the members of the welds 15a-15d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cassette tape storage case for storing an audio compact cassette tape or the like.

[0002]

2. Description of the Related Art A cassette tape storage case of this type is used for storing and storing or carrying an audio compact cassette tape or the like. FIG. 6 is a perspective view showing an external configuration of a conventional cassette tape storage case. In FIG. 6, this cassette tape storage case 1
Is also called a slide case, and the audio compact cassette tape 2 is stored in the internal space. When the audio compact cassette tape 2 is used after being housed, a depression or the like of a rotation drive unit (not shown) of the audio compact cassette tape 2 is pressed with a human finger M and pushed out.

[0003] First, an audio compact cassette tape 2 is inserted into a cassette tape storage case 1 with a human finger M.
An upper box member 1a having an elliptical slide opening 3 to be inserted when pressing is formed by molding a transparent resin. Next, similarly, the lower box member 1b having no slide opening 3 is manufactured by molding a transparent resin or an opaque resin. Thereafter, the peripheral end surfaces of the upper box member 1a and the slide opening 3 coincide with each other, and the joint described below with reference to FIG. Has been created.

FIG. 7 is a perspective view showing a configuration of a welding portion.
FIG. 8 is a cross-sectional view showing a cross-sectional configuration taken along line AA in FIG. FIG. 9 is a sectional view showing another structure of the welding portion. 7 and 8, the welded portion is provided at a joint between the upper box member 1a and the lower box member 1b shown in FIG. For example, the cassette tape storage case 1 is provided at a total of five locations, two locations in the longitudinal direction and one location in the transverse direction. Depending on the size of the cassette tape storage case 1, the entire periphery may be a welding portion.

The joint portion of the upper box member 1a is L-shaped (key shape)
The joint of the lower box member 1b is also formed in the upper box member 1b.
A welding rib (energy director) 10 is formed in an inverted L-shape and has a chevron-shaped projection for concentrating and melting the ultrasonic vibration energy during welding. Note that the welding rib 10 may be in the shape of a trapezoid or a trapezoid. The L-shaped combination of the upper box member 1a and the lower box member 1b prevents displacement of the members at the time of welding, and improves the appearance and appearance of the finished product.

That is, the workpieces (the upper box member 1a and the lower box member 1) which are welded by the vibration of the welding horn at the time of welding the joints.
The same directional vibration (longitudinal vibration) or cross direction (lateral vibration) as that of the combination of the L-shaped combination welded portions b) is applied. In this case, the cross-sectional shapes are the upper box member 1a and the lower box member 1
Since it is a key type combining the L-shape of b, the displacement of the attachment member is suppressed with respect to the welded portion where the upper box member and the lower box member shown in FIG. 9 are parallel (a = b). In addition, by performing welding with the welding ribs provided inside, it is possible to avoid the appearance defect, that is, the occurrence of a product defect due to the overflow of the welding resin due to excessive welding.

Further, as shown in FIG. 8, such a welded portion is welded by setting a gap c on the front side of the upper box member 1a and the lower box member 1b before welding to be larger than an inner gap d. That is, no gap is generated in the gap d after welding.

FIG. 10 is a cross-sectional view for explaining the welding step. In FIG. 10A, the welding of the L-shaped joint of the upper box member 1a and the lower box member 1b is started by the pressing and vibration of the welding horn 11, and then as shown in FIG. 10B. The welding rib 10 is thermally melted and welded to the upper box member 1a. FIG. 10 (c) shows the welding displacement of the L-shaped combined welding portion of the upper box member 1a and the lower box member 1b. That is, even in such an L-shaped welded portion,
Since the thickness of the member is small and the area of the combination portion is small, the pressing force of the welding horn 11 cannot be received only by the welding portion.

As a result, stresses Pa and Pb are generated outside and upward of the member by the pressing of the welding horn 11, buckling and the welded portion has a thickness g (thickness of the member) shown in FIG.
, The width f becomes wider, and the tip portion of the member spreads outward and upward. This buckling tends to occur particularly when the member at the joint of the L-shape of the upper box member 1a and the lower box member 1b is thin, and tends to occur at both ends of the welded portion.

As a countermeasure, the thickness of the upper box member 1a and the lower box member 1b is adjusted so that the members are not buckled forcibly by using a clamping jig or the like during welding. It is conceivable to use a manufacturing method in which In this case, the members of the upper box member 1a and the lower box member 1b rub against the jig due to the vibration during the ultrasonic welding, and the member surfaces are scratched and the external appearance is impaired.

[0011]

As described above, in the above-described conventional cassette tape storage case, the L-shaped joint portion buckles due to the pressure of the welding horn and expands outward and upward. Quality degrades. If the width of the welded portion protruding due to buckling is large, both ends of the audio compact cassette tape
There is a problem that it cannot be inserted due to contact during the insertion.

The present invention solves such problems in the prior art. In particular, even when the joining members of the upper box member and the lower box member are thin, welding misalignment due to buckling of the welding portion is prevented. It is an object of the present invention to provide a cassette tape storage case capable of reliably obtaining sufficient strength and a predetermined storage size inside and improving appearance quality.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method of manufacturing a vehicle, comprising the steps of:
It has a welding portion that is heat-welded by ultrasonic waves, and this welding portion forms a member of the upper box member substantially in an L shape, and
The lower box member is formed in an L-shape opposite to the L-shaped portion of the upper box member, and is joined in a key shape.
In a cassette tape storage case in which a welding rib is formed on one of the letter-shaped portions, the respective L-shaped portions and the welding rib of the upper box member and the lower box member are alternately inverted.

Further, according to the present invention, the L-shaped portion of the welding portion and the welding rib are alternately inverted from the intermediate portion, and are formed.
Alternatively, it is formed by alternately inverting a plurality of portions at equal intervals. Further, the welded portions are regularly arranged at the joining portion of the upper box member and the lower box member, or are formed in the entire area of the joining portion. Further, in the present invention, a chamfered portion is formed at a protruding portion of the L-shaped portion of the welded portion of the upper box member and the lower box member.

Further, according to the present invention, the welding rib includes a cross-sectional shape such as a chevron shape, a kamaboko shape, and a trapezoidal shape,
And this welding rib is formed into a plurality of divided, or
A plurality of conical welding ribs are arranged. Further, the present invention has a box shape having an opening, and a slide opening for inserting and removing the cassette tape from the opening and pressing the cassette tape with at least a person's finger is formed. .

In the cassette tape storage case of the present invention having such a configuration, the L-shaped portions and the welding ribs of the upper box member and the lower box member are alternately formed by inversion. Are staggered,
The stress, which is the excess pressure of the welding horn, is offset. As a result, even when the members at the joints of the upper box member and the lower box member are thin, welding displacement due to buckling of the welded portion is eliminated, sufficient strength and predetermined internal storage dimensions are reliably obtained, and appearance quality is improved. And the manufacturing yield is improved.

Further, according to the present invention, since the chamfered portion is formed at the protruding portion of the L-shaped portion of the welded portion of the upper box member and the lower box member, when the upper box member and the lower box member are joined and joined together. In addition, the protruding portion in the L-shaped portion does not come into contact with the corner, and even if it comes into contact, it is guided by this chamfered portion,
It will fit into a predetermined position accurately. As a result,
The welding displacement at the welded portion is further reduced, and in this case as well, sufficient strength and a predetermined storage size inside can be reliably obtained, and the appearance quality is improved, and the production yield is improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a cassette tape storage case of the present invention will be described in detail with reference to the drawings.
In the following, description will be made using FIGS. 6 to 10 redundantly, and the same components as those in FIGS. 6 to 10 will be denoted by the same reference numerals. FIG. 1 is a perspective view showing a configuration of a welding portion (joining portion) in the embodiment of the cassette tape storage case of the present invention, and FIG. 2 is an upper box member and a lower box member and a welding portion (joining portion) in the cassette tape storage case. FIG. 4 is an exploded perspective view showing the position of the.

First, in FIG. 2, the cassette tape storage case 20 is formed by molding a resin such as transparent to produce an upper box member 1a and a lower box member 1b. A slide opening 3 is provided in the upper box member 1a. In addition, welding portions 15 are provided on both sides of the cassette tape storage case 20 in the longitudinal direction.
a, 15b and welded parts 15c, 15d are formed.

In FIG. 1, welding portions 15a to 15d are
The cross-sectional shape of the joining portion of the upper box member 1a and the lower box member 1b is a key shape combining L shapes. The direction is reversed at the center of the welded portions 15a to 15d. That is, at the position corresponding to the welding portions 15a to 15d of the lower box member 1b, first, an upwardly projecting projection 16a is formed to extend outward, and a mountain-like welding rib (energy director) is formed inside the projection 16a. 17a is provided parallel to and extending from the protruding portion 16a. Further, an upwardly protruding portion 1 having the same length and width as the protruding portion 16a on the inside, which is an inverted position.
6b is formed to extend, and a mountain-shaped welding rib 17b is provided outside and parallel to and extending from the protruding portion 16b.

The upper box member 1a has L corresponding to the projection 16a, the welding rib 17a, the projection 16b, and the welding rib 17b.
A projecting portion 18 having a character-like shape and an intermediate portion, which protrudes downward.
a and 18b are formed to be inverted inside and outside. The protruding portions 16a and 16b of the upper box member 1a are formed as described with reference to FIG.
The length (height) is smaller than a and 16b, so that a small gap is formed at the time of joining.

On the inner end faces of the projections 16a and 16b,
The chamfers 19a and 19b are formed. The chamfered portions 19a and 19b are for easily and accurately joining the upper box member 1a and the lower box member 1b when they are combined. That is, the upper box member 1a when joining the welded portions 15a to 15d of the upper box member 1a and the lower box member 1b.
The protruding portions 18a, 18b do not abut on the corners of the protruding portions 16a, 16b, and even if they do, they are guided by the chamfered portions 19a, 19b so as to fit into predetermined positions.

The joints having such a structure (welded portions 15a to 15a)
15d), the welding horn 11 abuts and is welded as described with reference to FIGS. At this time, the welding portions 15a to 15d when the upper box member 1a and the lower box member 1b are combined are formed by the projections 18a and 18b and the projection 16a.
a and 16b are alternately joined, so that FIG.
As shown in (c), the stresses Pa and Pb, which are the excess pressure of the welding horn 11, are offset.

As a result, as shown in FIG. 10 (c), the member does not buckle and does not protrude outward and upward. Therefore, even if the members at the joining portions of the upper box member a and the lower box member 1b are thin, the welded portions 15a to 15
The welding displacement due to the buckling of d is eliminated, sufficient adhesive strength and a predetermined internal storage size are reliably obtained, and the audio compact cassette tape 2 can be easily taken in and out. In addition, appearance quality is improved. In other words, the production yield is improved.

FIG. 3 is a perspective view showing a main configuration of a modified example of the welding portions 15a to 15d, and FIG. 4 is a perspective view showing the welding portions 15a to 15d.
It is a perspective view showing important section composition of other modification of d. In FIG. 3, this example is basically the same as the structure shown in FIG. 1, but forms welding ribs 20a and 20b in which mountain-like welding ribs 17a and 17b are separated. This structure is the upper box member 1
a and the thickness and material of the lower box member 1b may be determined.

The structure shown in FIG. 4 is basically the same as the structure shown in FIG. 1, and conical projections form continuous welding ribs 21a and 21b. This structure is also the upper box member 1.
a and the lower box member 1b may be determined in consideration of the thickness and material.

FIG. 5 is a perspective view for explaining a completed state and a used state where the upper box member and the lower box member are welded. Cassette tape storage case 2 manufactured as described above
In FIG. 3, the audio compact cassette tape 2 is inserted and stored from the opening surface as shown in FIG. When the audio compact cassette tape 2 is used after being stored, the recessed portion of the rotary drive unit (not shown) of the audio compact cassette tape 2 is pushed out with a human finger M.

In this embodiment, the welding portions 15a to 15a
The structure of 15d is reversed to two inverted L-shaped structures (projections 16a, 16b and welding ribs 17a, 17b).
And the projections 18a, 18b), but may be configured in three or more inverted inverted L shapes. in this case,
The configuration (the number of three or more inverted L-shaped arrangements) may be determined in consideration of the welding strength based on the thickness and material of the upper box member 1a and the lower box member 1b.

In this embodiment, the cassette tape storage case 20 for storing the audio compact cassette tape 2 has been described. However, the present invention can be applied to a storage case for storing other various products. For example, it is also suitable for a cassette tape storage case for storing general-purpose audio cassette tapes and video cassette tapes.

[0030]

As is apparent from the above description, according to the cassette tape storage case of the present invention, the L-shaped projections and welding ribs of the upper box member and the lower box member are alternately inverted. Since the welding horn is formed and joined, the stress, which is the surplus pressure of the welding horn, is offset. As a result, even when the member at the joint is thin, welding displacement due to buckling of the welded portion is eliminated, sufficient strength and a predetermined internal storage size are reliably obtained, and the appearance quality is improved, and the production yield is improved. improves. Further, according to the present invention, since the chamfered portion is formed at the protruding portion of the L-shaped portion of the welded portion, when the upper box member and the lower box member are joined together, the protruding portion at the L-shaped portion is formed. Part will not touch the corner,
The protruding portion is guided by the chamfered portion, so that the protruding portion is accurately fitted in a predetermined position. As a result, welding misalignment at the welded portion is reduced, and in this case, sufficient strength and a predetermined internal storage size are reliably obtained, and the appearance quality is improved.
The production yield will be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a welding portion in an embodiment of a cassette tape storage case of the present invention.

FIG. 2 is an exploded perspective view showing positions of an upper box member, a lower box member, and a welding portion in the cassette tape storage case according to the embodiment.

FIG. 3 is a perspective view showing a main configuration of a modified example of a welding portion in the embodiment.

FIG. 4 is a perspective view showing a configuration of a main part of another modified example of the welded portion in the embodiment.

FIG. 5 is a perspective view for explaining a completed state and a used state in which the upper box member and the lower box member are welded in the embodiment.

FIG. 6 is a perspective view showing an external configuration of a conventional cassette tape storage case.

FIG. 7 is a perspective view showing a structure of a welding portion in a conventional example.

FIG. 8 is a cross-sectional view showing a configuration taken along line AA in FIG.

FIG. 9 is a cross-sectional view showing another structure of a welded portion in a conventional example.

FIG. 10 is a cross-sectional view for explaining a welding step in a conventional example. (A) has shown the state where welding of the joining part by the welding horn has started. (B) shows a state in which the welding rib is thermally melted and welded to the upper box member. (C) shows the welding displacement of the welding part.

[Explanation of symbols]

1a: Upper box member, 1b: Lower box member, 3: Slide opening, 11: Welding horn, 15a to 15d: Welding part, 17
a, 17b, 20a, 20b, 21a, 21b: welding rib, 16a, 16b, 18a, 18b: projecting portion, 19
a, 19b: chamfer, 20: cassette tape storage case.

Claims (10)

[Claims] Claims: 1. An upper box member and a lower box member,
It has a welding portion that is heat-welded by ultrasonic waves, the welding portion forms the member of the upper box member substantially in an L shape, and the lower box member is opposite to the L-shaped portion of the upper box member. A cassette tape storage case that is formed in an L-shape and is joined in a key shape, and a welding rib is formed on one of the L-shaped portions of the upper box member and the lower box member. Characterized in that the respective L-shaped portions and the welding ribs are alternately inverted. 2. The cassette tape storage case according to claim 1, wherein an L-shaped portion of the welding portion and a welding rib are alternately inverted from an intermediate portion. 3. The cassette tape storage case according to claim 1, wherein the L-shaped portion of the welding portion and the welding rib are alternately formed in a plurality of turns at equal intervals. Case. 4. The cassette tape storage case according to claim 1, wherein the welded portions are arranged at regular intervals in a joint portion of the upper box member and the lower box member. 5. The cassette tape storage case according to claim 1, wherein the welded portion is an entire region of a joining portion of the upper box member and the lower box member. 6. The cassette tape storage case according to claim 1, wherein a chamfered portion is formed at a protruding portion of an L-shaped portion of a welded portion of the upper box member and the lower box member. Case. 7. The cassette tape storage case according to claim 1, wherein the welding rib has a cross-sectional shape including a chevron shape, a trapezoidal shape, and a trapezoidal shape. 8. The cassette tape storage case according to claim 1, wherein the welding rib has a sectional shape including a chevron shape, a trapezoidal shape, and a trapezoidal shape, and the welding rib is formed of a plurality of divided pieces. Alternatively, a cassette tape storage case, wherein a plurality of conical welding ribs are arranged. 9. The cassette tape storage case according to claim 1, wherein the upper box member and the lower box member are joined to each other in a box shape having at least one opening, and a cassette tape is put in and out of the opening. A cassette tape storage case. 10. The cassette tape storage case according to claim 9, wherein a slide opening is formed in the upper box member and the lower box member for pushing the cassette tape in and out with at least a human finger. Cassette tape storage case.