JP2015009890A - Corrugated fiberboard tray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated fiberboard tray that has inner side plates in side walls, and are easy to assemble and hard to deform in an in-use state.SOLUTION: A corrugated fiberboard tray has a side wall 2 and an end wall 3, adjoining each other across a corner part, provided successively at a periphery of a bottom wall 1; and the side wall 2 is formed by internally folding an outer plate 4, a top plate 5, an inner side plate 6, and a middle side plate 7 connecting with the bottom wall 1 in order, a folding-in piece 8 extending from the middle side plate 7 and end wall 3 is held between the outer side plate 4 and inner side plate 6, and a lock mechanism by engagement between a lock projection 9 provided on the side wall 2 and a lock hole 10 provided in the bottom wall 1 suppress reaction to the folding of the side wall 2. The lock projection 9 of the lock mechanism is formed by cutting the inner side plate 6 toward a base part side, connecting with the inner side plate 6, of the middle side plate 7, and made to protrude as the middle side plate 7 is folded from the inner side plate 6.

Description

  The present invention relates to a corrugated tray suitable for packing heavy objects.

  The refrigerator manufactured in the factory is delivered in a state of being supported from the bottom by a corrugated tray used as a packing base in the distribution process. At this time, a general corrugated tray with a side wall and an end wall that are adjacent to each other with a corner portion around the bottom wall is insufficient in strength with respect to a heavy refrigerator and bends and collapses during transportation. Since there is a possibility, the reinforcement of the wood beam is performed between the end walls facing each other.

  Moreover, in order to omit such reinforcement by wood, a corrugated tray made of a triple structure in which the corrugated boards overlap each other with three corrugated boards, which is assembled from a blank as shown in FIG. 7 is used. There is also.

  In this blank, a side wall 52 is connected to a pair of short sides of the rectangular bottom wall 51, and an end wall 53 is connected to the pair of long sides, and the side wall 52 includes an outer plate 54, a top plate 55, which are sequentially connected to the bottom wall 51, It is comprised from the part of the inner side board 56 and the inner side board 57. FIG. In the side wall 52, the middle side plate 57 is smaller in width than the inner side plate 56, and extends only in the intermediate portion in the width direction of the inner side plate 56. Folding pieces 58 are continuously provided on both side ends of the end wall 53.

  Locking protrusions 59 are provided at both ends of the base of the inner side plate 57 at the distal end of the inner side plate 56, and the locking protrusions 59 are formed on the bottom wall 51 along a ruled line that forms a boundary with the outer side plate 54. Locking holes 60 are provided at corresponding positions. The locking projection 59 and the locking hole 60 constitute a lock mechanism that maintains the tray in an assembled state.

  In addition, on both sides of the front end of the inner plate 56, there are provided locking cuts 61 into which protrusions at both ends of the foam cushioning material are fitted, and the bottom wall 51 has a U-shaped cut near one end wall 53. A hand hole 62 is provided with a line of sight.

  In this blank, the direction of the step in which the top of the center of the corrugated cardboard extends is directed to the direction extending along the side wall 52 between the end walls 53 facing each other. Corrugated cardboard has a high strength in the longitudinal direction in which the corrugation extends, and a small strength in the lateral direction that intersects the corrugated board.

  To assemble the blank into the tray shown in FIG. 8, the pair of end walls 53 are raised from the bottom wall 51, the folding piece 58 is bent inward, and the outer plate 54, the top plate 55, the inner plate 56 and the middle plate 57 are rolled up. The inner side plate 57 and the folded piece 58 are sandwiched between the outer side plate 54 and the inner side plate 56 so as not to overlap with each other to form a triple-structure side wall 52, and the locking projection 59 is engaged with the locking hole 60. The locked state in which the repulsion of the side wall 52 against the entrainment is suppressed.

  When packing the refrigerator, the cushioning material S made of foamed polystyrene is placed inside the pair of end walls 53, and the protrusions at both ends of the cushioning material S are fitted into the locking cuts 61, and the cushioning material S is attached to this tray. And the bottom of the refrigerator is supported by the buffer material S.

  In such a corrugated tray, the corrugated direction in which the strength of the corrugated board extends is extended in the width direction of the side wall 52, and the side wall 52 has a triple structure. Even if it is lifted in the acted state, the deformation accompanying the bending of the side wall 52 is suppressed, and reinforcement with wood in the direction in which the side wall 52 extends becomes unnecessary.

  In addition, as a paper tray having an end wall having a triple structure, a paper tray as described in Patent Document 1 below is also known. This tray is a paper box for packaging made of cardboard, and has a weight. It is not used as a packing base for transporting goods, and does not include a locking mechanism by engagement between a locking projection and a locking hole.

Japanese Utility Model Publication No. 31-16081

  However, in the corrugated tray shown in FIG. 8 described above, as shown in FIG. 9, the locking projection 59 that is an extension of the inner plate 56 is separated from the outer plate 54 by the thickness of the inner plate 57 and the folding piece 58. In the assembly, as shown by the chain line, the locking projection 59 must be pushed into the locking hole 60 while the inner plate 56 is bent against the strong repulsive force against the winding of the side wall 52. There is a problem that it is difficult to assemble efficiently.

  In addition, since the step is a horizontal line that tends to buckle at the portion of the locking protrusion 59, the locking protrusion 59 cannot resist the repulsive force against the entanglement of the side wall 52 in use, as shown in FIG. There is a problem in that the locking projection 59 is bent and comes out of the locking hole 60 to be unlocked, and the shape retaining property is easily impaired.

  Therefore, an object of the present invention is to make it easy to assemble a corrugated tray having an inner side plate on the side wall, and to make the shape difficult to collapse in use.

  In order to solve the above-described problems, the present invention has an outer plate, a top plate, and an inner plate that are connected to adjacent sidewalls and end walls around the bottom wall, and that are connected sequentially to the bottom wall. It is formed by winding of the plate and the inner side plate, and a folding piece extending from the inner side plate and the end wall is sandwiched between the outer side plate and the inner side plate. In the cardboard tray restrained by the locking mechanism by engagement with the provided locking hole, the locking projection of the locking mechanism is formed by cutting the inner plate on the base side connected to the inner plate of the inner plate, It was made to project as the middle plate was bent from the plate.

  In this corrugated tray, in order to prevent a gap corresponding to the thickness of the corrugated cardboard from forming inside the side wall, the inner side plate is extended only in the intermediate portion in the width direction of the inner side plate, and the space between the outer side plate and the inner side plate is increased. It is preferable that the inner side plate and the folded piece do not overlap each other in the state of being sandwiched between the two.

  Moreover, in what is used for packing of a heavy article, it is good to prevent a side wall from bending | deflection by orient | assigning the step of a corrugated cardboard to the direction extended along a side wall between the opposing end walls.

  In this corrugated tray, when assembling, simply by folding the outer side plate, top plate, inner side plate and middle side plate of the side wall, the locking projection protrudes along the inner surface of the outer plate, and the assembly operator pushes the locking projection. Even if it is not pushed into the locking hole with a large force, the locking projection enters the locking hole and the locked state is suppressed against repulsion of the side wall, reducing the work load and improving the work efficiency of the assembly. .

  In addition, since the locking projections are along the inner surface of the outer plate in the assembled state, the locking projections are prevented from bending due to repulsion against the side wall, and the locking projections are difficult to come out of the locking holes. Since it becomes difficult to come off, shape retention is improved, and a refrigerator or the like, which is a heavy object, can be stably supported and transported.

The perspective view which shows the use condition of the cardboard tray which concerns on this invention Figure showing the same blank as above Perspective view showing the assembly process The perspective view which shows an assembly state same as the above. Enlarged perspective view of the locking mechanism Vertical side view of side wall along line VI-VI in FIG. The figure which shows the blank of the conventional cardboard tray The perspective view which shows an assembly state same as the above. Vertical side view of the side wall along the line IX-IX in FIG. Longitudinal side view showing how the lock is released

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIG. 1, this cardboard tray is also used as a packing base for transporting the refrigerator R, and is assembled from a blank as shown in FIG.

  In this blank, a side wall 2 is connected to a pair of short sides of the rectangular bottom wall 1, and an end wall 3 is connected to the pair of long sides, and the side wall 2 is connected to the bottom wall 1 in sequence by an outer plate 4, a top plate 5, It is comprised from the part of the inner side board 6 and the inner side board 7. FIG. The inner side plate 7 is set to have a width smaller than that of the inner side plate 6 and extends only in the intermediate portion of the inner side plate 6 in the width direction, but is wider than the inner side plate 57 shown in FIG. Folding pieces 8 are connected to both ends of the end wall 3.

  Locking projections 9 are provided on both sides of the base ruled line connected to the inner plate 6 of the inner plate 7 by cutting the inner plate 6 into a U-shape, and the bottom wall 1 forms a boundary with the outer plate 4. A locking hole 10 is provided at a position corresponding to the locking projection 9 along the ruled line. The locking projection 9 and the locking hole 10 constitute a lock mechanism that maintains the tray in an assembled state.

  Further, locking cuts 11 into which the projections at both ends of the foamed cushioning material S are fitted are provided on both sides of the front end of the inner plate 6, and the bottom wall 1 is U-shaped toward one end wall 3. A hand hole 12 is provided with a score line.

  In this blank, the direction of the step in which the top of the center of the corrugated cardboard extends is directed to the direction extending along the side wall 2 between the opposing end walls 3.

  To assemble the blank into the tray, as shown in FIG. 3, the pair of end walls 3 are erected from the bottom wall 1, the folding piece 8 is bent inward, the outer plate 4, the top plate 5, the inner plate 6 and the middle plate. 4 to 6, the inner side plate 7 and the folded piece 8 are sandwiched between the outer side plate 4 and the inner side plate 6 so as not to overlap to form the side wall 2 having a triple structure. Then, the locking projection 9 is engaged with the locking hole 10 to obtain a locked state in which the repulsion of the side wall 2 against the entanglement is suppressed.

  As shown in FIG. 1, when packing the refrigerator R, the foamed cushioning material S is placed inside the pair of end walls 3, and the protrusions at both ends of the cushioning material S are fitted into the locking cuts 11. Thus, the buffer material S is fixed to the tray, and the bottom of the refrigerator R is supported by the buffer material S. The refrigerator R and the tray are integrated by banding or the like.

  Even in such a corrugated tray, the corrugated cardboard stage extends in the width direction of the side wall 2 and the side wall 2 has a triple structure, as in the case shown in FIG. The side wall 2 is not easily bent even if it is lifted up, and reinforcement with wood in the direction in which the side wall 2 extends becomes unnecessary.

  Further, in this corrugated tray, when the outer plate 4, the top plate 5, the inner plate 6, and the inner plate 7 of the side wall 2 are folded when being assembled, the locking projection 9 protrudes along the inner surface of the outer plate 4. Even if the assembling worker does not push the locking projection 9 into the locking hole 10 with a large force, the locking projection 9 enters the locking hole 10, and the locked state in which repulsion of the side wall 2 is suppressed is obtained. The work load is reduced and the assembly work efficiency is improved.

  Further, in the assembled state, since the locking projection 9 is along the inner surface of the outer plate 4, a phenomenon that the locking projection 9 is bent due to repulsion against the side wall 2 is prevented, and the locking projection 9 is locked into the locking hole 10. Since it becomes difficult to come off and the lock is difficult to release, the shape retention is improved, and the refrigerator R, which is a heavy object, can be stably supported and transported.

  In addition, since the shape retaining property is improved as described above, it is possible to reduce the manufacturing cost by using a material having a slightly lower strength and a lower cost as a corrugated cardboard.

  In the above embodiment, the side wall 2 is illustrated in which the middle side plate 7 and the folding piece 8 do not overlap. However, when further load bearing strength is required, the width of the middle side plate 7 is set to the outer side plate 4 and the top plate. 5 and the inner plate 6 are aligned to be substantially the same in width and extend from the opposing end wall 3 to the extent that the tips are abutted against each other, and the middle plate 7 and the folded piece 8 are spread over the entire width of the side wall 2. And the side wall 2 may have a quadruple structure.

  Further, although the corrugated cardboard has been illustrated in the direction extending along the side wall 2 between the opposing end walls 3, the corrugated cardboard is required when the bending strength of the end wall 3 needs to be improved. The step may be directed in a direction orthogonal to that of the above embodiment, that is, in a direction extending along the end wall 3 between the opposing side walls 2.

DESCRIPTION OF SYMBOLS 1 Bottom wall 2 Side wall 3 End wall 4 Outer plate 5 Top plate 6 Inner plate 7 Middle side plate 8 Folding piece 9 Locking protrusion 10 Locking hole 11 Locking notch 12 Hand hole R Refrigerator S Buffer material

Claims (3)

  Around the bottom wall (1), the side wall (2) and the end wall (3) adjacent to each other with the corner portion interposed therebetween are connected, and the outer plate (4) sequentially connecting the side wall (2) to the bottom wall (1) The top plate (5), the inner plate (6) and the middle plate (7) are formed by winding, and between the outer plate (4) and the inner plate (6), the middle plate (7) and the end wall (3). The retraction of the side wall (2) is caught between the locking protrusion (9) provided on the side wall (2) and the locking hole (10) provided on the bottom wall (1). In the cardboard tray restrained by the locking mechanism by engagement, the inner plate (6) is cut into the base side that connects the locking projection (9) of the locking mechanism to the inner plate (6) of the middle plate (7). A cardboard tray formed by the method described above, wherein the tray protrudes when the inner side plate (7) is bent from the inner side plate (6).   The corrugated tray according to claim 1, wherein the inner side plate (7) is extended only in the intermediate portion in the width direction of the inner side plate (6) and is sandwiched between the outer side plate (4) and the inner side plate (6). A corrugated tray made such that the inner side plate (7) and the folded piece (8) do not overlap in a state of being bent.   The corrugated board tray according to claim 1 or 2, wherein the corrugated board has a corrugated cardboard orientated in a direction extending along the side wall (2) between the opposing end walls (3).

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