JP3084353U - Structure of welded part of file case - Google Patents

Abstract

(57) Abstract: Even if a plurality of sheet-like bodies to be welded are welded at ends near a welded portion, part of the sheet-like body protruding due to welding is not removed from an end of another sheet-like body. It provides a new weld structure that does not protrude further. SOLUTION: The structure of the welded portion of the present invention is such that at least an end near a welded portion of a sheet material laminated in the middle of a plurality of welded synthetic resin sheet materials has an intermediate sheet material. Of the other sheet-like bodies laminated on the main surface, the protruding part 42 by the welded part at the end located closer to the welded part of the intermediate sheet-like body and located inside the end part 34a of one sheet-like body is other. Of the at least one sheet-shaped body, the plurality of sheet-shaped bodies are laminated and welded in a state where the sheet-shaped body does not protrude from the end 34a of at least one sheet-shaped body.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a structure of a welded portion of a sheet-shaped body, and more particularly to a structure of a welded portion capable of suppressing a protrusion of a synthetic resin due to welding of a laminate in which synthetic resin sheets such as polypropylene are laminated and welded. .

[0002]

[Prior art]

 As shown in FIG. 8, a conventional laminate of three or more synthetic resin sheets is welded by an ultrasonic sealing method, that is, an ultrasonic vibration is applied to a film to seal the film by frictional heat generated on an adhesive surface thereof. Depending on the method used, welding is generally performed.

[0003]

[Problems to be solved by the invention]

 An ultrasonic sealer is composed of an oscillator that generates a current of, for example, a frequency of 20 kc, and a processing machine. The processing machine converts a high-frequency current into a longitudinal vibration by a magnetostrictive vibrator, and converts the vibration through a miniature ball attached to a tip of a resonance horn. However, since the heat is concentrated only on the adhesive part, a beautiful and strong seal can be obtained, but there is a problem that the synthetic resin in the welded part protrudes. In particular, as shown in FIGS. 9 and 10, when the protrusion 1 occurs at the end of the synthetic resin sheet to be welded, the protrusion 1 is interposed, particularly in the middle, from the end of the laminated synthetic resin sheet. The end of the intermediate synthetic resin sheet 2 protrudes from the ends of the synthetic resin sheets 3 and 4 laminated on both sides thereof, not only impairing the appearance but also adhering other objects to the end. Sometimes there is a problem that inconvenience occurs.

[0004] Therefore, a main object of the present invention is that even if the plurality of sheets to be welded are welded at the ends close to the welded portion, a part of the sheet due to welding may not be formed on another sheet. The purpose is to provide a new welded structure that does not protrude beyond the end of the body.

[0005]

[Means for Solving the Problems]

 The structure of the welded portion according to claim 1 of the present invention is such that, of the plurality of welded sheets, at least one of the sheets is welded at an end near the welded portion of the sheet. This is a welded part structure in which a plurality of sheet-like bodies are stacked and welded so as to be located inside an end of at least one sheet-like body. The structure of the welding portion according to claim 2 of the present invention is such that at least an end portion of the plurality of synthetic resin sheet bodies that are welded near the welded portion of the sheet material stacked in the middle is a middle sheet shape. Among the other sheet-like bodies laminated on the main surface of the body, the protruding part due to the welded part at the end located closer to the welded part of the intermediate sheet-like body and located inside the end of one sheet-like body is other. 2. The structure of the welding portion according to claim 1, wherein a plurality of the sheet-like bodies are stacked and welded in a state where the plurality of sheet-like bodies do not protrude from an end of at least one of the sheet-like bodies. The structure of the welding portion according to claim 3 of the present invention is such that, of the plurality of spot-shaped thermoplastic sheet materials, at least the edge near the welded portion of the sheet material stacked in the middle is formed in the middle. At an end located closer to the welded portion of the intermediate sheet-like body than the edge of the other sheet-like body laminated on the outer main surface in the thickness direction of the sheet-like body in the longitudinal direction and / or the width direction. The plurality of sheet-like bodies are stacked and welded in a state where the protruding portion by the welded part does not protrude from the edge in the longitudinal direction and / or the width direction of another sheet-like body. The structure of the welded portion described in the above.

The above and other objects, features, and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention with reference to the drawings.

[0007]

[Embodiment of the invention]

 FIG. 1 is an exploded perspective view of a portable file case provided with a structure of a welding portion according to an embodiment of the present invention. FIG. 2 shows a structure of the welding portion according to the embodiment of the present invention. FIG. FIG. 3 is a cross-sectional view of FIG. 1A-A showing the structure of the welded portion according to an embodiment of the present invention. FIG. 4 is an illustrative plan view showing one embodiment of the present invention.

The portable file case 10 includes a case body 12 and a lid 14 that covers the opening 12 a of the case body 12. The case body 12 includes a front plate 16, a back plate 18, a bottom plate 20 provided between the front plate 16 and the back plate 18, and a side plate 22. The lower edge 14a of the lid 14 is formed in a straight line, and the upper edge 12b formed of the front plate 16, the rear plate 18 and the side plate 22 constituting the case body 12 is also formed in a straight line. The upper edge 12b of the main body 12 and the lower edge 14a of the lid 14 are formed so as to be in close contact with each other when the lid 14 is put on the case main body 12.

The case body 12 and the lid 14 are both made of a heat-sealable synthetic resin sheet such as a thermoplastic plastic, for example, polypropylene, and constitute a synthetic resin sheet constituting the front plate 16 and a back plate 18. Side members 30 each extending from the synthetic resin sheet to form the side plate 22 are provided. The side surface member 30 forming the side surface plate 22 includes an intermediate side surface member 32 extending from the front plate 16, an outer side surface member 34 extending from the back plate 18, and an innermost inner side member of the intermediate side member 32. And a three-layer structure composed of an inner side surface member 36 laminated on the inner side. That is, the outer side surface member 34 is laminated on one main surface of the intermediate side surface member 32, and the inner side surface member 36 is laminated on the other main surface, and between the outer side surface member 34 and the inner side surface member 36. An intermediate side member 32 is interposed.

The side surface member 30 is formed by heat welding an intermediate side surface member 32, an outer side surface member 34, and an inner side surface member 36 constituting the side member 30 at appropriate intervals along an outer peripheral edge by an ultrasonic sealer. The reason why the side member 30 has the three-layer structure is to maintain the overall strength of the portable file case 10.

The outer side member 34 constituting the side member 30 has a linear shape that is the same height as the upper end of the back plate 18, and is configured to be in close contact with the lower edge 14 a of the lid 14. The inner side surface member 36 of the side surface member 30 is configured to be inserted into the inner side surface of the side surface portion 14b of the lid portion 14, and the tongue piece 36a protrudes upward from the upper end edge 34a of the outer side surface member 34. When the opening 12a of the case body 12 is closed by the lid 14, the tongue piece 36a of the inner side surface member 36 comes into close contact with the inner side of the side surface 14b of the lid 14.

The intermediate side surface member 32 constituting the side surface member 30 is formed between the outer side surface member 34 and the inner side surface member 36 by the spot welding portion 40 and the outer side surface member 34 and the inner side surface member 36. Although it is welded, the protruding portion 42 formed by welding is slightly protruded from the welding portion 40 near the upper end edge 32 a of the intermediate side member 32, with the synthetic resin being slightly melted from the upper end edge 32 a of the intermediate side member 32. However, the upper edge 32a of the intermediate side member 32 is lower than the upper edge 34a of the outer side member 34, that is, located inside (in this embodiment, lower side) the upper edge 34a of the outer side member 34. The protruding portion 42 is formed in a state where the protruding portion 42 does not protrude outside the upper edge 34 a of the outer side surface member 34. That is, the length of the protruding portion of the synthetic resin is expected, and the upper edge 32a of the intermediate side member 32 is positioned inside the upper edge 34a of the outer side member 34 by the length of the protruding portion 42. The height of the intermediate side member 32 is adjusted. Therefore, even when the cover portion 14 is covered with the opening portion 12a of the case body 12 without the protrusion portion 42 protruding from the upper end edge 34a of the outer side surface member 34, the protrusion portion 42 does not hinder the lower end of the cover portion 14. The edge 14a and the upper edge 12b of the case body 12 are in close contact. Further, the distance between the outer side member 34 and the inner side member 36 is not expanded by the protrusion 42 beyond the thickness of the intermediate side member 32.

The present invention is not limited to the above-described embodiment, and may be applied to a laminated structure in which the structure of welding is a portion other than the side members or a synthetic resin sheet other than polypropylene is welded. Although the intermediate synthetic resin sheet is constituted by one synthetic resin sheet in the above embodiment, the intermediate synthetic resin sheet, for example, as shown in FIG. The number of constituent synthetic resin sheets is not limited to one, and a structure in which a plurality of sheets are laminated may be used.

In the above-described embodiment, the end near the welded portion, that is, the outer peripheral edge of the synthetic resin sheet is cut out, and the cut-out and shorter end of the synthetic resin sheet is used. The end portion where the protruding portion was formed was formed, and the end portion was formed so as to be located inside the edge of the other laminated synthetic resin sheet. However, as shown in FIGS. 6 and 7, the welding portion was formed. A U-shaped notch 102 is formed in the synthetic resin sheet at a position close to 40, and a protruding portion 106 formed by welding from an end 104 formed by the U-shaped notch 102 is formed inside the U-shaped notch 102. The position of the end portion 104 may be appropriately changed so as to be formed as shown in FIG.

[0015]

[Effect of the invention]

 According to the invention, of the plurality of sheet-like bodies to be welded, the end of at least one sheet-like body near the welded portion is located inside the end of the other sheet-like body to be welded. As described above, a plurality of sheet-like bodies are stacked and welded, and among the plurality of stacked sheet-like bodies, a sheet-like body located inside an end of another sheet-like body is welded. Even if a protruding portion is formed at the end near the welded portion, the protruding portion is located inside the end of the other stacked sheet-like body, and it does not impair the appearance and pushes other stacked members. An optimal laminated structure can be configured without expanding.

[Submission Date] October 26, 2001 (2001.10.26)

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

[Technical field to which the invention belongs]

This invention relates to a structure of a welded portion of a sheet-like body constituting a file case, and in particular, a synthetic resin sheet such as polypropylene is laminated and welded, which can suppress extrusion of a synthetic resin due to welding. Regarding the structure of the part.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

Therefore, a main object of the present invention is to provide a file case in which a plurality of sheet members to be welded are welded at the ends close to the welded portion, but a part of the sheet member is welded. The purpose of the present invention is to provide a new welded structure in which the protrusion does not protrude outside the edge of another sheet.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

[Means for Solving the Problems]

Structure of the welded portion of claim 1 in such a file case of this invention, among the plurality of sheet-like body that is welded to configure the file cases, the ends close to the weld portion of the at least one sheet-like member Of a welded portion of a file case , in which a plurality of sheet-like members are stacked and welded so as to be located inside an end of at least one sheet-like member among other sheet-like members to which a sheet is welded. It is. The structure of the welded portion of the file case according to claim 2 of the present invention is such that, of the plurality of welded synthetic resin sheets, at least the end near the welded portion of the sheet laminated in the middle is the middle. Of the other sheet-like bodies laminated on the main surface of the sheet-like body of the above-mentioned sheet-like body, which is located inside the end of one sheet-like body and close to the welded part of the intermediate sheet-like body, protrudes by the welded part at the end. The welding of the file case according to claim 1, wherein the plurality of sheet-like members are stacked and welded in a state where the portion does not protrude from an end of at least one of the other sheet-like members. The structure of the part. The structure of the welded portion of the file case according to claim 3 of the present invention is the end near the welded portion of at least the middle of the plurality of thermoplastic plastic sheet members welded in a spot shape. The edge is located on the inner side in the longitudinal direction and / or the width direction from the edge of the other sheet-like material laminated on the outer main surface in the thickness direction of the intermediate sheet-like material, and the edge of the intermediate sheet-like material. A plurality of sheets were laminated and welded in a state where the protruding portion due to the weld at the end close to the weld did not protrude beyond the edge of the other sheet in the longitudinal direction and / or the width direction. It is a structure of the welding part of the file case according to claim 1 or claim 2.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

The portable file case 10 includes a case body 12 for storing articles and the like, and a lid 14 covering an opening 12 a of the case body 12. The case body 12 includes a front plate 16, a back plate 18, a bottom plate 20 provided between the front plate 16 and the back plate 18, and a side plate 22. The lower edge 14a of the lid 14 is formed in a straight line, and the upper edge 12b formed of the front plate 16, the rear plate 18 and the side plate 22 constituting the case body 12 is also formed in a straight line. The upper edge 12b of the main body 12 and the lower edge 14a of the lid 14 are formed so as to be in close contact with each other when the lid 14 is put on the case main body 12.

[Brief description of the drawings]

FIG. 1 is a perspective view of a portable file case having a structure of a welding portion according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a structure of a welding portion according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of FIG. 1A-A showing a structure of a welding portion according to an embodiment of the present invention.

FIG. 4 is a schematic plan view showing an embodiment of the present invention.

FIG. 5 is an illustrative sectional view showing a structure of a welding portion according to another embodiment of the present invention.

FIG. 6 is an illustrative plan view showing another embodiment of the present invention.

FIG. 7 is an illustrative sectional view showing a structure of a welding portion in the embodiment shown in FIG. 6;

FIG. 8 is an illustrative front view showing a method of welding a synthetic resin sheet.

FIG. 9 is a schematic plan view showing a conventional synthetic resin sheet welding method.

FIG. 10 is an illustrative sectional view showing a conventional synthetic resin sheet welding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Portable file case 12 Case main body 12a Opening of case main body 12b Upper edge of case main body 14 Lid 14a Lower edge of lid 14b Side of lid 16 Front plate 18 Back plate 20 Bottom plate 22 Side plate 30 Side member 32 Intermediate Side member 32a Upper edge of intermediate side member 34 Outer side member 34a Upper edge of outer side member 36 Inner side member 36a Tongue piece 40 Welding part 42 Protruding part 102 U-shaped notch 104 End part 106 Protruding part

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[Procedure amendment]

[Submission Date] October 26, 2001 (2001.10.
26)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of device

[Correction method] Change

[Correction contents]

[Name of device] Structure of welded part of file case

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims for utility model registration

[Correction method] Change

[Correction contents]

[Utility model registration claims]

Claims (3)

[Utility model registration claims] 1. An end portion of at least one sheet member among a plurality of sheet members that are welded, and an end portion of at least one sheet member near a welded portion is welded. A welded structure in which a plurality of sheet-like bodies are stacked and welded so as to be located further inside. 2. The method according to claim 1, wherein at least an end of the plurality of synthetic resin sheet bodies which are welded is close to a welded portion of the intermediately stacked sheet body. Of the sheet-like bodies, the protruding part by the welded part at the end near the welded part of the intermediate sheet-like body that is located inside the end of one sheet-like body,
The structure of the welding part according to claim 1, wherein a plurality of the sheet-like members are laminated and welded in a state where the sheet-like member does not protrude from an end of the at least one sheet-like member. 3. A plurality of thermoplastic sheet sheets welded in a spot shape, wherein at least an edge near a welded portion of a sheet material laminated in the middle is an outer side in a thickness direction of the intermediate sheet material. The protruding portion due to the welded portion at the end located closer to the welded portion of the intermediate sheet-like body and located inside the edge of the other sheet-like body laminated on the main surface in the longitudinal direction and / or the width direction, and the other sheet 3. The structure of the welded part according to claim 1, wherein a plurality of sheet-like bodies are laminated and welded in a state where the plurality of sheet-like bodies do not protrude from an edge in a longitudinal direction and / or a width direction of the body.