JP2006062742A - Side plate connecting structure for foldable container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate formation and manufacturing using injection molding dies for a plastic material, and to improve the usability of a foldable container by assembling it so that its inner face is comparatively flat. <P>SOLUTION: A connecting structure connects a bottom plate and side plates such that the side plates 300 are freely turned at approximately 90° inside a surrounding wall 101 integrally formed upright along outer peripheral edges of the rectangular bottom plate 100. The connecting structure integrally includes an engaging part 205 separated from the surrounding wall, vertically extending from the upper face of the bottom plate, and having a projection 204 at an upper end in order to narrow a space 203 from the internal wall of the surrounding wall. Additionally, a cut space 301 is defined at the lower edge of the side plate so that the engaging part is positioned. In addition, an inward hook-like part 302 is integrally formed at the lower edge of the side plate so as to continue from the one side edge and upper edge of the cut space and project into the cut space. The inward hook-like part is passed through the narrowed space 203 and engaged with the engaging part 205. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plastic container that can be folded by tilting a side plate inward.

It has a rectangular bottom plate, a rectangular upper frame, a long side plate in which an upper plate member and a lower plate member are refractably connected in a “<” shape, and a short side plate, and a lower portion on opposite long sides of the bottom plate. Each plate can be pivoted inwardly so that it can be tilted inward, and the upper plate can be tilted inwardly on the opposite long side of the upper frame, and the short side plate can be tilted inward on the opposite short side of the upper frame. A plastic folding container that is pivotally attached is disclosed in the following Patent Documents 1 and 2, or other publications.
JP-A-11-35034 Utility Model Registration No. 2589166

  By the way, it is generally desirable that the inner surface of the container be as flat as possible so that the contents and dust are not caught or inserted into the container. When the connecting portion between the frame and the side plate is viewed from the inner surface, a concave portion or a gap (shown in FIG. 3 and FIG. 18 in the above-mentioned Patent Document 1) occurs. That is, when a doubly-supported connecting shaft is formed integrally with an injection mold as in the conventional connecting portion, a recess or a gap must be generated on the inner surface due to the mold structure.

  In addition, since the load is applied to the connecting shaft, the connecting shaft may be deformed and damaged when a heavy load or a long time load is applied as in the case where the containers are stacked in multiple stages. In addition, although the structure which connected the side plate by inserting a strong metal shaft pin is also known, in addition to the disadvantage that a recess or a gap occurs as described above, the assembly of inserting the metal shaft pin There is a problem in that it takes time and is troublesome to separate at the time of disposal due to the mixing of different materials.

  In addition, there are known ones in which the connecting portion is made flexible and thin and is integrally formed, but there is a drawback that the strength is insufficient by making the connecting portion thin.

  Therefore, the folding container of the present invention is intended to facilitate the molding and production by a plastic injection mold and improve the usability of the folding container by making the inner surface flatter in the assembled state.

  For this purpose, the invention of the folding container according to claim 1 is directed to a bottom plate and a side plate that are connected to the outer periphery of a rectangular bottom plate so that the side plate can be rotated about 90 degrees inside a surrounding wall. And is integrally formed with an engaging portion having a protruding portion that is spaced apart from the surrounding wall and stands vertically from the upper surface of the bottom plate and narrows the distance from the inner surface of the surrounding wall at the upper end. A notch space in which the engaging portion can be located at the edge is formed, and the inwardly saddle-like portion is extended from one side edge and the upper edge of the notch space so as to protrude into the notch space. And the inwardly hooked portion is passed through the narrow space and engaged with the engaging portion.

  According to a second aspect of the present invention, in the folding container, when the side plate is erected, the tip edge of the inward saddle-shaped portion comes into contact with the upper surface of the bottom plate, so that the load on the side plate passes through the inward saddle-shaped portion. It is characterized by being transmitted to.

  The invention according to claim 3 is characterized in that, in the folding container, a protruding protrusion is formed on the inner surface of the surrounding wall of the bottom plate so as to face the protruding portion of the engaging portion.

  Further, the invention of the folding container according to claim 4 is characterized in that the side plate is connected to the inside of the surrounding wall of the rectangular upper frame integrally formed in a hanging shape on the outer periphery so as to be rotatable inward by about 90 degrees. The frame and the side plate are connected to each other, and are integrally formed with an engaging portion having a protruding portion that is spaced from the surrounding wall and hangs down from the upper frame and narrows the distance from the inner surface of the surrounding wall at the lower end. An incision space in which the engaging portion can be located is formed on the upper edge, and the inwardly hooked portion is connected to one side edge and the lower edge of the notch space so as to protrude into the notch space. And the inwardly hooked portion is passed through the narrow space and engaged with the engaging portion.

  According to a fifth aspect of the present invention, in the above folding container, a horizontal wall is formed on the upper frame, and when the side plate is erected, the leading edge of the inwardly hooked portion comes into contact with the lower surface of the horizontal wall. The load is transmitted to the side plate through the inwardly saddle-shaped portion.

  According to a sixth aspect of the present invention, in the above folding container, a horizontal protrusion for securing is formed on the inner surface of the surrounding wall of the upper frame so as to face the protruding portion of the engaging portion.

In the invention described in claim 1 and claim 4, it becomes easy to mold and manufacture with a plastic injection mold, and the inner surface can be flattened in an assembled state, and an object can be caught or fitted. Since it disappears, the usability of the folding container is improved.
In the invention described in claim 2 and claim 5, deformation is prevented without applying a load to the engaging portion.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a plastic folding container according to the present invention, FIG. 2 is a perspective view at the time of folding, FIG. 3 is a central longitudinal sectional view of the folding container of FIG. 1, and FIG. In the figure, 100 is a rectangular bottom plate, 200 is a rectangular upper frame, 300 is a pair of long side plates in which an upper plate member 300a and a lower plate member 300b are refractorably connected in a "<" shape, and 400 is a pair of The lower plate 300b is pivotally attached to the opposite long sides of the bottom plate 100 so as to be tilted inward, and the upper plate 300a is pivotally attached to the opposite long sides of the upper frame 200 so as to be tilted inward. The short side plates 400 are pivotally attached to the opposite short sides of the upper frame 200 so as to be able to tilt inward, and after the short side plate 400 is tilted inward, the long side plate 300 is refracted in an inward shape. As a result, the upper frame 200 is lowered, and the upper frame 200 is overlaid on the bottom plate 100 as shown in FIG. Reference numerals 500a and 500b denote a pair of plastic lid plates pivotally attached to the upper surface of the upper frame 200 so as to be openable and closable.

As shown in FIG. 5, the bottom plate 100 is formed by integrally forming a surrounding wall 101 upright on the outer peripheral edge, and on both long sides of the bottom plate 100, as shown by arrows in FIG. Three types of connection structures a to c for connecting the lower plate member 300b) so as to be rotatable about 90 degrees inside are adopted.
The connection structure a relates to the invention described in claims 1 to 3, and as shown in FIGS. 7 and 8, an upper bulging portion 102 is formed at a portion intersecting the surrounding wall 101 on the upper surface of the bottom plate 100, and On the one side of the bulging portion, an engagement portion 105 is integrally formed having a protruding portion 104 that is vertically spaced from the upper surface of the bottom plate 100 and that is vertically spaced from the upper surface of the bottom plate 100 and narrows the gap 103 with the inner surface of the surrounding wall 101 at the upper end. A notch space 301 in which the upper bulging portion 102 and the engaging portion 105 can be located is formed at the lower edge of the long side plate 300, and is continuous from one side edge and the upper edge of the notch space and protrudes into the notch space. Inwardly, the inwardly saddle-shaped portion 302 is formed integrally with the lower edge of the side plate 300. The inwardly saddle-like portion 302 is configured to pass through the narrow gap 103 and engage with the engaging portion 105. When the long side plate 300 (lower plate member 300b) is erected, the tip edge of the inward flange portion 302 abuts on the upper surface of the bottom plate 100, so that the load on the side plate is transmitted to the bottom plate through the inward flange portion. I am doing so. Reference numeral 106 denotes a horizontal ridge that is formed on the inner surface of the surrounding wall 101 so as to face the protruding portion 104 of the engaging portion 105 and serves to prevent the inward flange portion 302 from being pulled out. In this connection structure a, the projecting portion 104 is formed in a q shape as shown in FIG. 7, and the inward saddle-shaped portion 302 is formed in an arc shape that is in sliding contact with the outer periphery of the projecting portion 10. The sliding contact enables smooth rotation, and the lower plate member 300b can be tilted about 90 degrees inward.

  In addition, the connecting structure b is formed with a rectangular upper bulge portion 110 at a central portion of both long side edges of the bottom plate 100 at a portion intersecting the surrounding wall 101 on the upper surface of the bottom plate, and bearing holes on both side walls of the upper bulge portion. 111 is formed, and a notch space 310 in which the upper bulging portion and the engaging portion can be located is formed at the center of the lower edge of the lower plate member 300b, and the inner wall of the notch space is formed in the notch space. A pair of support shafts 311 are horizontally formed so as to protrude, and the support shafts 311 are elastically deformed so as to be freely loosely fitted in the bearing holes 111.

  In addition, the connection structure c is formed with a pair of bearing pieces 120 and 121 at appropriate distances near both ends of both long sides of the bottom plate 100, and bearing pieces near both ends of the lower edge of the lower plate member 300b. A notch space 320 in which 120 can be located is formed, a bearing piece 321 is formed so as to protrude into the notch space, and the bearing piece 321 is positioned in series between the bearing pieces 120 and 121 to form the bottom plate 100. This is a structure in which a resin pin 322 is inserted from the outside to be rotatably connected.

Next, a structure in which the upper plate member 300a and the lower plate member 300b are connected to each other so as to be rotatable about 180 degrees so that they can be refracted in an inward shape will be described with reference to FIGS. This connection structure employs three types of connection structures df. The connection structure d and the connection structure e are of the same type, and a vertical plate-shaped shaft support portion 330 protrudes slightly inward from the lower edge of the outer surface of one upper plate member 300a, and is integrally formed with the shaft support portion. While forming the support shaft 331, the inner plate 332 is formed by refracting outward a predetermined width near the upper edge of the lower plate member 300b at least by an amount corresponding to the thickness of the opposite plate member. A pair of outwardly expanded portions 333 and 334 are formed on the upper edge of the plate member 300b with a space where the shaft support portion 330 can be positioned, and the cantilevered support shaft 331 is loosely fitted to one of the outwardly expanded portions 333. A notched cylindrical bearing portion 335 is formed. The outer diameter of the shaft support portion 330 is formed to be substantially the same as the outer diameter of the outward expansion portions 333 and 334, and both end edges 333 ′ and 334 ′ of the outward expansion portion are chamfered in a slope shape. This reduces the impact during a collision by smoothing the outer surface and reducing the bulge. Further, the bearing portion 335 of the coupling structure d is formed in a tapered shape (by so-called undercut) as shown in FIG. 10 to prevent the shaft from coming off, and the bearing portion 335 of the coupling structure e is as shown in FIG. Is formed into a U-shaped cross section. Thus, the structure of this bearing part 335 differs between the connection structure d and the connection structure e. Therefore, in the connection structure d, the cantilevered support shaft 331 is strongly pressed against the bearing portion 335 at the time of assembly, whereby the bearing portion 335 is elastically deformed and the cantilevered support shaft 331 is fitted into the bearing portion 335. For this reason, in the connection structure d, the cantilevered support shaft 331 is difficult to be pulled out sideways, and the side plate 300 is prevented from bulging outward due to the pressure received from the contents in the container. 10 and 11, the outer bent rib formed on the lower edge of the upper plate member 300a faces the inner groove 332, so that the boundary between the container inner surface and the lower plate member 300b is continuous without unevenness. . Further, since the shaft support portion 330 is sandwiched between the outwardly expanded portions 333 and 334, movement in the axial direction is hindered, and there is no backlash.
The connection structure f has the same structure as the connection structure c, and the bearing pieces 336 and 337 are formed at both lower edge ends of the upper plate member 300a, and the bearing pieces 338 are formed at both upper edge ends of the lower plate member 300b. A resin pin 339 is inserted into each bearing piece.

These connection structures d to f are formed on the outer surface side of the upper plate member 300a and the lower plate member 300b, and when the upper plate member 300a and the lower plate member 300b are erected together, in the inner surface groove 332 of the lower plate member 300b. Since the lower end edge of the upper plate 300a is superposed, the inner surface of the container is flat and has no gap.
Reinforcing column portions 370 and 371 whose inner surfaces are formed in a concave groove shape by being refracted outward at both end edges of the upper plate member 300a and the lower plate member 300b are integrally formed, and inwardly extending inside the reinforcing column portion. The respective engagement pieces 372 and 373 are integrally formed.

  Further, as shown in FIG. 4, the upper frame 200 is formed by integrally forming a surrounding wall 201 on the outer periphery in a hanging shape, and the long side plate 300 (upper plate member 300 a) is rotated about 90 degrees inside the surrounding wall 201. In order to connect freely, the same three types of connection structures a to c as described above are adopted. That is, as shown in FIG. 7, the connection structure a has a protruding portion 204 that hangs down from the lower edge of the upper frame 200 at a position separated from the surrounding wall 201 and narrows the distance 203 between the inner surface of the surrounding wall 201 and the lower end. The engaging portion 205 is integrally formed, and a notch space 340 in which the engaging portion 205 can be positioned is formed at the upper edge of the long side plate 300, and is connected from one side edge and the lower edge of the notch space. An inward flange portion 341 is integrally formed on the upper edge of the long side plate so as to protrude into the cut space. Also, as shown in FIG. 12, when the horizontal wall 206 is formed in the surrounding wall 201 of the upper frame 200 and the long side plate 300 (upper plate member 300a) is erected, the leading edge of the inward saddle-shaped portion 341 is By abutting against the lower surface of the horizontal wall, the load of the upper frame is transmitted to the long side plate via the inward flange portion 341. Reference numeral 343 denotes a horizontal ridge that is formed on the inner surface of the surrounding wall 201 so as to face the protruding portion 204 of the engaging portion 205 and serves to prevent the inward flange portion 341 from being removed.

  In addition, the connecting structure b forms a hanging wall 209 inside the surrounding wall 201 at the center of both long side edges of the upper frame 200, and opens a bearing hole 210 in the hanging wall, while the upper edge of the upper plate member 300a is A notch space 350 is formed in the center, a pair of support shafts 351 are horizontally formed on the inner wall of the notch space so as to protrude into the notch space, and the support shafts 351 are elastically deformed to thereby form bearing holes. 210 is freely loosely fitted in 210. A horizontal wall 211 is formed in the surrounding wall 201 of the upper frame 200, and the load on the support shaft 351 is reduced because the load of the upper frame is transmitted to the long side plate via the horizontal wall 211. ing.

  Further, the connection structure c is formed with a pair of bearing pieces 220 and 221 that are appropriately spaced apart from both ends of both long sides of the upper frame 200, and bearing pieces that are close to both ends of the upper edge of the upper plate member 300a. A notch space 360 in which 220 can be located is formed, a bearing piece 361 is formed so as to protrude into the notch space, and the bearing piece 361 is positioned in series between the bearing pieces 220 and 221 so that the upper frame In this structure, resin pins 362 are inserted from the outside of 200 to be freely connected. Reference numeral 230 denotes a handhold recess formed on the outer side of the short side of the upper frame 200.

  Further, the short side plate 400 is pivotally attached to the opposite short sides of the upper frame 200 by three types of connection structures a to c similar to the above so as to be tiltable about 90 degrees inwardly. The description is abbreviate | omitted by attaching | subjecting the same code | symbol to the same part. Note that the short side plate 400 is set up right above the reinforcing column portions 370 and 371 of the upper plate member 300a and the lower plate member 300b so that the short side plate 400 is raised as shown in FIG. In this case, the reinforcing column portions 370 and 371 are concealed by both end surfaces of the short side plate. The inward hook-like engagement pieces 372 and 373 can be engaged with the reinforcing rib 401 formed on the outer peripheral surface side of the short side plate 400. The reinforcing rib 401 is formed on the surface side of the short side plate 400, and the reinforcing rib 402 is formed in a double frame shape inside the rib.

Next, first and second engagement mechanisms for engaging the short side plate 400 with the bottom plate 100 in an upright state will be described with reference to FIGS.
The first engagement mechanism integrally forms a stand 130 on the upper surface of the central portion of the short side of the bottom plate 100, forms a flange 131 that extends horizontally from both sides of the top of the stand, and An engaging portion 403 that can intervene under the flange when the short side plate is erected at the center of the lower edge is formed. In this way, when the engaging portion 403 intervenes and engages below the collar portion, even if the weight of the contents is continuously applied to the bottom plate 100, the bottom plate 100 is bent downward and excessively deformed. It is prevented.

  Further, the second engagement mechanism is integrally formed with upright pieces 132 that extend in a direction perpendicular to the short side of the bottom plate 100 with a little space on both sides of the upright stand 130, and an engaging claw on the side surface of the upright piece. 133, and the reinforcing rib 401 at the lower edge of the short side plate 400 is cut away to form a hanging piece 404 parallel to the upright piece 132. The hanging piece is engaged with the engaging claw 133. The nail | claw piece 405 which can be formed is formed integrally. By engaging the standing piece 132 and the hanging piece 404 in this way, the engagement state between the engagement claw 133 and the claw piece 405 can be maintained even if the bottom plate 100 is slightly curved downward. In other words, there is no possibility of disengagement due to some deformation, and a constant engagement state is always maintained. For this reason, even if it is severely used, the short side plate 400 cannot be held upright and cannot be folded.

  In addition, the cover plates 500a and 500b are formed in a concave and convex shape so that the upper surface central portion 510 is formed in a shallow concave shape so that a label or the like can be attached, and the plate members constituting the cover plates are placed upward on both side edges. By forming it in a partially curved form, the handle hole 511 that opens to the side surface of the container and the protrusion 512 for preventing misalignment during loading that protrude upward are used as well. In addition, an upward piece 513a and a downward piece 513b are formed at opposite tip edges of the cover plates 500a and 500b so as to be able to engage with each other. Then, one side of the connection piece 514 is pivotally attached to the recess 231 formed on the upper surface of the long side of the upper frame 200, and the connection piece 514 is connected to the recess 515 formed at the base edge of the cover plates 500a and 500b. By pivotally attaching the other side, the lid plates 500a and 500b can be widened outwardly.

  In this embodiment, the connection structures a to c are used as the connection means between the bottom plate and the long side plate, the connection between the top frame and the long side plate, and the connection method between the top frame and the short side plate, but only the connection structure a. It is possible to connect the bottom plate and the long side plate, the upper frame and the long side plate, or the upper frame and the short side plate. According to the connection structure of the present invention, the engaging portion is integrally formed upright from the top surface of the bottom plate or suspended from the top frame, and the inwardly hooked portion is formed integrally with the side plate. Therefore, it is stronger than the conventional shaft shape of the connecting shaft, and has the advantage that it is difficult to bend and deform under heavy loads and long-term loads, and it can be easily punched during plastic molding, and it can be used in the container. Therefore, the inner surface can be kept flat without any recesses or gaps. For this reason, usability is improved.

  In addition, when the side plate is erected, the load is transmitted to the bottom plate and the upper frame through the inwardly saddle-like portion, so that the load on the engaging portion is reduced, and there is little risk of deformation or damage. A folding container can be provided.

  In this embodiment, a folding container having a long side plate in which an upper plate member and a lower plate member are connected in a refraction-like manner inwardly is described, but a side plate is provided on each side of a rectangular bottom plate so as to be tiltable inward. The connecting structure of the present invention can also be applied to connecting parts such as side plates in other types of folding containers, which can provide various advantages as described above.

The perspective view of the folding container which shows the Example of this invention. The perspective view at the time of folding of the folding container which shows the Example of this invention. The center longitudinal cross-sectional view of the folding container which shows the Example of this invention. The center cross-sectional view of the folding container which shows the Example of this invention. The perspective view of the baseplate of the folding container which shows the Example of this invention. The perspective view which looked at the bottom plate and long side plate of the folding container which show the Example of this invention from the inner side. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. The disassembled perspective view of the connection part of the baseplate and long side board of a folding container which shows the Example of this invention. The disassembled perspective view of the long side board of the folding container which shows the Example of this invention. FIG. 3 is an enlarged cross-sectional view taken along line BB in FIG. 1. The CC sectional view enlarged view of FIG. The DD sectional view taken on the line of FIG. EE sectional view taken on the line of FIG. FF sectional view taken on the line of FIG. The GG sectional view taken on the line of FIG. The folding operation state figure of the short side board of the folding container shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Bottom plate 101 Surrounding wall 102 Upper swelling part 103 Space | interval 104 Projection part 105 Engagement part 106 Horizontal protrusion 200 Upper frame 201 Surrounding wall 203 Space | interval 204 Projection part 205 Engagement part 206 Horizontal wall 300 Long side board 300a Upper board material 300b Lower board material 301 Cutting Space 302 Inward flanged portion 340 Cut space 341 Inward flanged portion 343 Horizontal protrusion 400 Short side plate 500a, 500b Cover plate

Claims (6)

  A connecting structure of a bottom plate and a side plate for connecting a side plate so as to be rotatable about 90 degrees inside a surrounding wall integrally formed in an upright manner on an outer peripheral edge of a rectangular bottom plate, and is separated from the surrounding wall. An engaging portion is integrally formed with a protruding portion that stands vertically from the upper surface of the bottom plate and has a narrowed gap with the inner surface of the surrounding wall at the upper end, while a notch space in which the engaging portion can be located at the lower edge of the side plate. Forming an inward saddle-like portion integrally with the lower edge of the side plate so as to extend from one side edge and an upper edge of the cut space and project into the cut space, and A connecting structure for side plates in a folding container, wherein the connecting structure is configured to pass through an interval and engage with the engaging portion.   2. The load on the side plate is transmitted to the bottom plate through the inward saddle-shaped portion by the tip edge of the inward saddle-shaped portion coming into contact with the upper surface of the bottom plate when the side plate is erected. The connection structure of the side plate in the folding container of description.   The connecting structure of the side plate in the folding container according to claim 1 or 2, wherein a protruding protrusion is formed on the inner surface of the surrounding wall of the bottom plate so as to face the protruding portion of the engaging portion.   A connecting structure of an upper frame and a side plate that connects a side plate so as to be rotatable about 90 degrees inside a surrounding wall of a rectangular upper frame integrally formed in a hanging shape on the outer periphery. An incision in which the engaging portion can be located at the upper edge of the side plate while integrally forming an engaging portion having a protruding portion that is spaced from the upper frame and that is spaced from the inner frame at the lower end and narrows the distance from the inner surface of the surrounding wall. Forming a space, and forming an inward saddle portion integrally with an upper edge of the side plate so as to project from the one side edge and the lower edge of the cut space into the cut space; A structure for connecting side plates in a folding container, wherein the structure is made to pass through a narrow space and engage with the engaging portion.   When the horizontal wall is formed on the upper frame and the side plate is erected, the load of the upper frame is transmitted to the side plate via the inward flanged portion because the leading edge of the inwardly flanged portion comes into contact with the lower surface of the horizontal wall. The side plate connection structure in the folding container according to claim 4, wherein the side plate connection structure is provided.   The connecting structure for side plates in a folding container according to claim 4 or 5, wherein a horizontal protrusion for securing is formed on the inner surface of the surrounding wall of the upper frame so as to face the protruding portion of the engaging portion.

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