JP4576241B2 - Folding container - Google Patents

Description

  According to the present invention, the lower plate is pivotally attached to the long sides opposite to each other so as to be tilted inward, and the upper plate is pivotally attached to each of the long sides opposite to the upper frame so as to be tilted inward. The present invention relates to a plastic folding container in which a short side plate is pivotally attached to a short side so as to be tilted inward.

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 square shape, and a short side plate, and a lower plate member is provided on the opposite long sides of the bottom plate. Each is pivotably attached to the inside so that it can be tilted, and the upper plate is pivotally attached to each of the long sides facing the upper frame so that it can be tilted to the inside, and the short side plate is pivotally attached to each of the short sides facing each other. Such plastic folding containers are disclosed in the following Patent Documents 1 and 2, or other publications.
JP-A-11-35034 Utility Model Registration No. 2589166

  By the way, this type of folding container has a problem that it is not load-bearing and has poor durability as compared with an integrally molded plastic container. That is, since the side plates are connected so as to be tiltable, the side plates are easily deformed depending on the state of use, and a molding error due to heat shrinkage of the plastic at the time of molding occurs in the side plates and the like, making it difficult to assemble. there were.

  In general, it is 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. In addition, there is a problem in that the inner surface cannot be kept flat depending on the formation state when the uneven bend is formed.

  Therefore, the present invention can be assembled without any problems even with some molding errors and deformation due to use, and it is robustly assembled and has excellent durability, and the inner surface is flat in the assembled state, improving usability. An attempt is made to provide a folded container.

Therefore, the invention of the folding container described in claim 1 includes 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 letter shape, and a short side plate, The lower plate is pivotally attached to each of the opposite long sides of the bottom plate so as to be tilted inward, and the upper plate is pivotally attached to each of the long sides of the upper frame so as to be tilted inward. In a plastic folding container in which the short side plate is pivotally attached to the short side so as to be tiltable inward, the first and second engagement mechanisms for engaging the short side plate with the bottom plate in an upright state are provided. The first engagement mechanism integrally forms an upright on the upper surface of the central portion of the short side of the bottom plate, and forms a flange extending horizontally from both sides of the upper portion of the upright, and at the center of the lower edge of the short side plate An engaging portion that can intervene under the flange when the short side plate is raised is formed. The second engagement mechanism is formed integrally with a standing piece standing on a short side of the bottom plate at a short interval on both sides of the stand, and standing up in a plane perpendicular to the short side. An engagement step portion protruding in a direction parallel to the short side and having an equal section in the vertical direction is projected, and an elastic engagement piece extending outward is integrally formed on the lower edge portion of the short side plate. In this state, the bottom plate is slightly bent and deformed in the vertical direction when the engaging portion is interposed below the flange portion of the first engaging mechanism. Further, the engagement step portion of the second engagement mechanism is formed in an equal cross section in the vertical direction so that the engagement state between the engagement step portion and the claw portion is maintained. .

According to the first aspect of the present invention, the assembling can be performed without any trouble even with a slight molding error or deformation due to use, and it can be assembled robustly and hardly damaged by an external force.

  Next, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of a plastic folding container according to the present invention, FIG. 2 is a perspective view of the plastic folding container, FIG. 3 is a central vertical sectional view of the folding container of FIG. 1, and FIG. In the figure, reference numeral 100 denotes a rectangular bottom plate, 200 denotes a rectangular upper frame, 300 denotes a pair of long side plates 300a and 300b that are refractably connected in a square shape, and 400 denotes a pair of short side plates. 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 so that the short side plates 400 can be tilted inward, and after the short side plate 400 is tilted inward, the long side plate 300 is refracted in a square shape. 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 periphery, and the lower plate member 300 b is formed on both long sides of the bottom plate 100 as indicated by arrows in FIG. 6. Three types of connection structures a to c for connecting the inside so as to be rotatable about 90 degrees are adopted.
As shown in FIGS. 7 and 8, the connecting structure a is formed with an upper bulging portion 102 at a portion intersecting the surrounding wall 101 on the upper surface of the bottom plate 100, and separated from the surrounding wall 101 on one side of the upper bulging portion. 100. An engaging portion 105 is formed integrally with a protruding portion 104 that stands vertically from the upper surface and has a narrowing interval 103 with the inner surface of the surrounding wall 101 at the upper end, while the upper bulging portion 102 and the A notch space 301 in which the engaging portion 105 can be located is formed, and the inwardly hooked portion 302 is connected to the lower side of the side plate 300 so as to protrude from the one side edge and the upper edge of the notch space into the notch space. It is formed integrally with the edge. The inwardly saddle-like portion 302 is configured to pass through the narrow gap 103 and engage with the engaging portion 105. When the lower plate member 300b is erected, the tip edge of the inwardly saddle-shaped portion 302 comes into contact with the upper surface of the bottom plate 100 so that the load on the side plate is transmitted to the bottom plate through the inwardly saddle-shaped portion. 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 hook-like portion 302 from being removed. 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, since the inwardly saddle-shaped part is formed integrally with the side plate, it is stronger than a shaft-like form extending horizontally like a conventional connecting shaft, and is resistant to heavy loads and long-time loads. In addition to being advantageous in that it is difficult to bend and deform, it is easy to punch out during plastic molding, and it is possible to keep the inner surface flat without forming recesses or gaps in the container.

  In addition, when the side plate is erected, the load is transmitted to the bottom plate and the upper frame through the inwardly hooked portion, so that the load on the engaging portion is reduced and there is no risk of deformation or breakage. Improve durability.

  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 a plurality of reinforcing ribs 374 are provided in the reinforcing column portion. The book is formed horizontally. Reference numerals 372 and 373 denote inward hook-shaped engagement pieces integrally formed on the inner surfaces of both end edges of the upper plate member 300a and the lower plate member 300b.

  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 upper plate member 300a is connected to the inner side of the surrounding wall 201 so as to be rotatable about 90 degrees inside. In order to do this, the same three types of connecting structures a to c are employed. 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 cut space 340 in which the engaging portion 205 can be located is formed on the upper edge of the long side plate 300, and is continuous from one side edge and the lower edge of the cut space. An inward flange portion 341 is formed integrally with 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 upper plate member 300a is raised, the leading edge of the inwardly saddle-shaped portion 341 is 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 protrusion 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. Yes.

  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, since the short side plate 400 is pivotally attached to the inner short side of the upper frame 200 by the same three types of connection structures a to c so as to be tiltable about 90 degrees inwardly, About the connection structure with the upper frame 200, 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 When the short side plate is erected at the center of the lower edge, an engaging portion 403 that can intervene under the flange 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. For this reason, it becomes a robust thing which is hard to be damaged, and durability against severe use increases.

In addition, the second engaging mechanism is integrally formed with standing pieces 132 that stand vertically on the short sides of the bottom plate 100 with a little space on both sides of the stand 130, and the short sides and the side surfaces of the standing pieces. Engagement step portions 133 projecting in the parallel direction and having the same cross section in the vertical direction are projected. On the other hand, the reinforcing rib 401 at the lower edge portion of the short side plate 400 is cut off, and an elastic engagement piece 404 extending outward is integrally formed in a hanging shape, and the engagement step portion 133 is engaged with the elastic engagement piece. The nail | claw part 405 to join is protrudingly provided. By engaging the standing piece 132 and the elastic engagement piece 404 in this way, the engagement state between the engagement step portion 133 and the claw portion 405 can be maintained even if the bottom plate 100 is slightly curved and deformed downward. it can. In other words, even if the bottom plate 100 is slightly deformed due to the weight of the contents or the like, or even if there is a slight molding error, the engagement step portion 133 and the claw portion 405 do not become unengageable. A constant engagement state is maintained. For this reason, even if a deformation | transformation arises by a shaping | molding error or severe use, the short side board 400 does not become unable to hold upright, or cannot be folded.

  As described above, the short side plate 400 is not easily damaged by an external force as a synergistic action of the first and second engagement mechanisms, and can be assembled without any problem even with some molding error or deformation due to use. It becomes like this.

  Further, when the short side plate 400 is erected, the short side plate engages with the inwardly hooked engagement pieces 372 and 373, and the reinforcing column portions 370 and 371 formed on the upper plate member 300a and the lower plate member 300b are the short side plate. Since the concavities and convexities of the reinforcing column portions 370 and 371 are hidden by the both end surfaces of the short side plate, not only the load resistance of the upper plate member 300a and the lower plate member 300b is increased, but also the assembly The inner surface becomes flat in a state, and the usability is improved without catching or fitting the contents or garbage.

  The cover plates 500a and 500b are formed in a shallow concave and concave shape on the upper surface central portion 510 so as to be finely uneven so that a label or the like can be attached, and the plate members constituting the cover plates are partially upward on both side edges. By being formed into a curved shape, the handle hole 511 that opens on the side surface of the container and the protrusion 512 for preventing misalignment during loading that protrude upward are also used. 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 cover plates 500a and 500b can be widened outwardly.

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. 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 130 Standing stand 131 Elevation part 132 Standing piece 133 Engagement step part 200 Upper frame 300 Long side board 300a Upper board material 300b Lower board material 370,371 Reinforcing pillar part 372,373 Inward hook-like engagement piece 400 Short side board 401,402 Reinforcing rib 403 Engaging portion 404 Elastic engaging piece 405 Claw portion 500a, 500b Cover plate

Claims (1)

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 square shape, and a short side plate, and a lower plate member is provided on the opposite long sides of the bottom plate. Each is pivotably attached to the inside so that it can be tilted, and the upper plate is pivotally attached to each of the long sides facing the upper frame so that it can be tilted to the inside, and the short side plate is pivotally attached to each of the short sides facing each other. The plastic folding container is provided with first and second engagement mechanisms for engaging the short side plate with the bottom plate in an upright state, and the first engagement mechanism is provided at the center of the short side of the bottom plate. A stand is integrally formed on the upper surface of the part, and a flange extending horizontally from both sides of the upper part of the stand is formed, and when the short side plate is erected at the center of the lower edge of the short side plate, An engaging portion capable of intervening on the side, and the second engaging mechanism is spaced a little on both sides of the stand. Standing pieces that stand upright in a plane perpendicular to the short sides are integrally formed on the short side of the plate, and an engaging step portion that protrudes in a direction parallel to the short sides and has an equal section in the vertical direction is formed on the side surface of the standing piece. And projecting, and integrally forming an elastic engagement piece extending outwardly on the lower edge of the short side plate, and projecting a claw that engages with the engagement step on the elastic engagement piece, In a state where the engaging portion is interposed below the flange portion of the first engaging mechanism, the engaging step portion of the second engaging mechanism has an equal cross section in the vertical direction even if the bottom plate is slightly curved in the vertical direction. A folding container characterized in that the engagement state between the engaging stepped portion and the claw portion is maintained by being formed .

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