JP7176862B2 - trays and tray blanks - Google Patents

Description

The present invention relates to trays and tray blanks.

Patent Literature 1 discloses a tray in which side walls are erected on four sides of a bottom wall. Of the four side walls, a pair of first side walls facing each other are configured with a single-layer structure, and a pair of second side walls facing each other are configured with a two-layer structure. The second side wall has an outer plate, an edge plate, and an inner plate, and the outer plate and the inner plate are spaced apart by the edge plate. Further, the second side wall is continuously provided with a holding portion for holding the first side wall and the second side wall in an upright state with respect to the bottom wall.

JP-A-61-127434

In the tray of Patent Document 1, the first side wall has a single layer structure and the thickness of the first side wall is thin, so the stability of stacking the trays is low. Specifically, if the positions of the lower tray and the upper tray are misaligned, the upper tray may fall into the lower tray.

SUMMARY OF THE INVENTION It is an object of the present invention to provide trays and tray blanks capable of improving stability when stacking trays.

A first aspect of the present invention is a bottom wall having a first side and a second side extending to intersect with the first side, and a single-layer structure first side wall erected on the first side. a second side wall having a two-layer structure erected on the second side; and a holding portion holding the first side wall and the second side wall in an upright state with respect to the bottom wall; The two side walls include an outer plate connected to the bottom wall, an edge plate extending inward from the tip of the outer plate along the direction in which the bottom wall extends, and an edge plate extending from the tip of the edge plate toward the bottom wall. and an inner plate arranged inside the outer plate, and the holding portion is connected to the outer plate of the second side wall and arranged outside the first side wall. a crosspiece extending inward along the direction in which the bottom wall extends from the upper end of the outer holding plate so as to cover the upper end of the first side wall; and an inner holding plate extending from a leading edge toward the bottom wall and disposed inside the first side wall, wherein the leading edge of the crosspiece moves away from the second side wall. A tray is provided extending in a direction transverse to the first side wall to approach the first side wall.

According to this configuration, when the trays are stacked vertically, the bottom wall of the upper tray is supported by the crosspiece of the lower tray. and misalignment of the lower tray. Therefore, even if the positions of the upper tray and the lower tray are slightly misaligned when the trays are stacked vertically, the upper tray will not fall into the lower tray, improving the stability of the trays. can.

The inner holding plate may have a side end portion extending from an end of the front edge portion of the crosspiece on the side of the first side wall toward the bottom wall, and the side end portion of the inner holding plate may extend toward the bottom wall. may be in contact with the first sidewall.

According to this configuration, since the first side wall and the side end portion of the inner holding plate are arranged without a gap, the side end portion of the inner holding plate is arranged apart from the first side wall. Compared to the case, it is possible to suppress damage to the articles accommodated inside the tray by the side edge.

The inner retaining plate extends along a plane orthogonal to the bottom wall such that a normal line of the inner retaining plate extending away from the first side wall extends along the direction in which the bottom wall extends. may be

According to this configuration, since the inner holding plate extends along the plane perpendicular to the bottom wall, when the trays are stacked vertically, it is possible to ensure the compressive strength against the vertical load applied to the trays.

The inner holding plate extends obliquely with respect to the bottom wall such that a normal line of the inner holding plate extending away from the first side wall extends from the leading end edge toward the bottom wall. may

According to this configuration, the inner holding plate extends obliquely with respect to the bottom wall so that the normal line of the inner holding plate extends toward the bottom wall toward the side opposite to the first side wall. , the space for accommodating the items widens toward the bottom wall. Therefore, even when the holding portion is provided with the upper holding plate, it is possible to suppress the reduction of the space for storing the article.

A supporting plate arranged between the outer holding plate and the inner holding plate of the holding portion may be connected to the first side wall, and the supporting plate extends from the tip of the first side wall. It may extend toward the inner retaining plate.

According to this configuration, the support plate is arranged between the outer holding plate and the inner holding plate of the holding portion, and the support plate extends toward the inner holding plate. supported by a plate. Therefore, since the support plate restricts the movement of the inner holding plate in the direction toward the outer holding plate, the distance between the outer holding plate and the inner holding plate can be maintained, and the articles can be stored in the tray in a stable state.

A projecting plate disposed between the outer plate and the inner plate of the second side wall may be connected to the first side wall, and the projecting plate extends from the tip of the first side wall to the inner plate. may extend toward

According to this configuration, the protruding plate is arranged between the outer plate and the inner plate of the second side wall, and the protruding plate extends toward the inner plate, so that the inner plate is supported by the outer plate via the protruding plate. ing. Therefore, movement of the inner plate in a direction toward the outer plate is restricted by the protruding plate, the distance between the outer plate and the inner plate can be maintained, and articles can be stored in the tray in a stable state.

A second aspect of the present invention is a bottom wall having a first side and a second side extending in a direction intersecting the first side, a first side wall connected to the first side, and the first side wall. a second side wall connected to two sides; and a holding portion for holding the first side wall and the second side wall in an upright state with respect to the bottom wall. It has an outer plate connected to two sides, an edge plate connected to the tip of the outer plate, and an inner plate connected to the tip of the edge plate. an outer retaining plate connected to the outer plate of the side wall and extending in the same direction as the first side wall; and a leading end edge connected to the outer retaining plate and extending obliquely with respect to the extending direction of the outer retaining plate. and an inner retaining plate connected to the leading edge of the board.

ADVANTAGE OF THE INVENTION According to this invention, the stability at the time of stacking and arrange|positioning a tray can be improved.

1 is a perspective view of a tray according to a first embodiment of the invention; FIG. The top view of the tray which concerns on 1st Embodiment. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. 3 is a sectional view taken along line IV-IV of FIG. 2; FIG. 2 is a perspective view showing a state in which the trays in FIG. 1 are vertically stacked; 2 is a plan view of the blank of the tray of FIG. 1; FIG. A cross-sectional view of a cardboard sheet. Sectional drawing which shows the general-purpose ruled line formed in the cardboard sheet. FIG. 4 is a cross-sectional view showing reverse ruled lines formed on a corrugated cardboard sheet. FIG. 4 is a cross-sectional view showing cutting lines formed on a corrugated cardboard sheet; FIG. 2 is a perspective view showing one step in assembling the tray of FIG. 1; FIG. 4 is a perspective view showing another step in assembling the tray of FIG. 1; FIG. 4 is a perspective view showing another step in assembling the tray of FIG. 1; FIG. 4 is a perspective view showing another step in assembling the tray of FIG. 1; The perspective view of the tray which concerns on the modification of 1st Embodiment. The perspective view of the tray which concerns on 2nd Embodiment. Sectional drawing similar to FIG. 3 of the tray which concerns on 2nd Embodiment. Sectional drawing similar to FIG. 4 of the tray which concerns on 2nd Embodiment. The top view of the blank of the tray of 2nd Embodiment.

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

(First embodiment)
1 to 5 show a tray 10 according to a first embodiment of the invention. The tray 10 has a pair of first side walls 16 facing each other with a single-layer structure, and a pair of second side walls 19 facing each other with a two-layer structure (double wall). The tray 10 also has a holding portion 32 for holding the first side wall 16 and the second side wall 19 in an upright state. As shown in FIG. 5, when the trays 10 are stacked vertically, the present invention is configured so that the upper tray 10 is less likely to fall inside the lower tray 10 by attaching an upper holding plate (cross plate) 35 to the holding portion. 32.

The tray 10 of this embodiment is assembled from blanks 10' shown in FIG. The blank 10' is formed by punching a paper corrugated sheet 1 (shown in FIGS. 7-10) with a known paper carton punching machine. In the following description, the vertical direction and the horizontal direction in FIG. 6 may be referred to as the vertical direction and the horizontal direction of the blank 10', respectively.

Referring to FIG. 7, the corrugated cardboard sheet 1 has a structure in which a corrugated medium 4 is arranged between a front liner 2 and a back liner 3 . Referring to FIG. 8, the dashed-dotted line in FIG. 6 is a general ruled line formed by ruling from the back liner 3 so as to reduce the thickness. Referring to FIG. 9, the chain double-dashed lines in FIG. 6 are reverse creases formed by creases from the side of the front liner 2 so as to compress the wall thickness. Referring to FIG. 10, the solid line in FIG. 6 is a cutting line formed by inserting a blade from the front liner 2 to the back liner 3, or a shape line (edge) by punching.

As shown in FIGS. 1 and 2, the tray 10 has a rectangular bottom wall 12 . Rectangular first side walls 16 are erected on a pair of first sides 12a of the bottom wall 12 facing each other via folding lines 17 made of general ruled lines. Rectangular second side walls 19 are erected from a pair of second sides 12b of the bottom wall 12 facing each other. An opening 11 is defined by the upper ends of the two first side walls 16 and the upper ends of the two second side walls 19 . The total length of the first side wall 16 along the bottom wall 12 is longer than the total length of the second side wall 19 .

6, one of the two first side walls 16 protrudes from the bottom wall 12 to one longitudinal side of the blank 10' (upward in FIG. 6), and the other extends from the bottom wall 12 to the blank 10'. It protrudes to the other side in the vertical direction (downward (reverse direction) in FIG. 6). Further, one of the two second side walls 19 projects from the bottom wall 12 to one side of the blank 10' in the horizontal direction (leftward in FIG. 6), and the other projects from the bottom wall 12 to the other side of the blank 10' in the horizontal direction. It protrudes to the side (rightward (reverse direction) in FIG. 6).

1-3, the second side walls 19 each comprise an outer skin 20, an edge plate 22 and an inner plate 24 of rectangular shape.

As shown most clearly in FIG. 3, the outer plate 20 is connected to the second side 12b of the bottom wall 12 via a folding line 21 which is a general-purpose ruled line. The skin 20 forms the first side wall 16 with respect to the bottom wall 12 by folding the blank 10' (shown in FIG. 6) along the folding line 21 such that the skin 20 is orthogonal to the bottom wall 12. protruding in the same direction. The folding line 21 extends in a direction perpendicular to the folding line 17 between the bottom wall 12 and the first side wall 16 .

The edge plate 22 is connected to the upper end (tip) of the outer plate 20 via a folding line 23 formed by a general-purpose ruled line. The edge plate 22 is formed by folding the blank 10' (shown in FIG. 6) along the folding line 23 so that the edge plate 22 is perpendicular to the outer plate 20, thereby extending the tray 10 along the direction in which the bottom wall 12 extends. protruding inward. The folding lines 23 extend parallel to the folding lines 21 of the bottom wall 12 and the outer plate 20 .

The inner plate 24 is connected to the inner end (tip) of the edge plate 22 via a folding line 25 formed by a general-purpose ruled line. The inner plate 24 extends parallel to the outer plate 20 by folding the blank 10' (shown in FIG. 6) along a folding line 25 so that the inner plate 24 is perpendicular to the edge plate 22. It is arranged inside the plate 20 . The folding line 25 extends parallel to the folding line 23 between the outer plate 20 and the edge plate 22 .

Referring to FIGS. 3 and 6 together, two locking pieces 26, 26 protrude from the tip of the inner plate 24 located on the bottom wall 12 side. Locking holes 13 for locking locking pieces 26 are formed by punching in the bottom wall 12 along the folding line 21 between the bottom wall 12 and the outer plate 20 . The width of the locking hole 13 in the horizontal direction (horizontal direction in FIG. 6) of the blank 10' is approximately the same as the width between the folding lines 23 and 25 on both sides of the edge plate 22. As shown in FIG. The locking hole 13 also functions as a positioning hole when stacking the trays 10 .

1 to 3, the second side wall 19 is provided with two positioning projections 27, 27 that are inserted into the locking holes 13. As shown in FIG. The positioning protrusion 27 has a triangular outer shape in a cross section perpendicular to the direction in which the folding line 25 extends, and protrudes upward from the upper end (edge plate 22) of the second side wall 19. As shown in FIG.

Referring to FIG. 6, the blank 10' of this embodiment is provided with two parallel cutting lines 28, 28 provided from the outer plate 20 to the inner plate 24, thereby forming the positioning projections 27. be done. The folding lines 23, 25 on both sides of the edge plate 22 are not formed between these cutting lines 28, 28. As shown in FIG. Between the ends of the cutting lines 28, 28 located on the outer plate 20 and between the ends of the cutting lines 28, 28 located on the inner plate 24, folding lines 29, 29 made of general ruled lines are provided, respectively. ing. In addition, in the intermediate portion between the cutting lines 28, 28, a folding line made of a general-purpose ruled line is positioned between the folding lines 23, 25 on both sides of the edge plate 22 and extends from one of the cutting lines 28, 28 to the other. 30 are provided.

1 to 4, holding portions 32 for holding the first side wall 16 and the second side wall 19 in an upright state are provided at both ends of the second side wall 19, respectively. The holding portion 32 is connected to the second side wall 19 , and includes an outer holding plate 33 arranged outside the first side wall 16 and an upper holding plate (crosspiece) 35 arranged above the first side wall 16 . and an inner retaining plate 37 arranged inside the first side wall 16 . Further, as shown in FIG. 3 , the holding portion 32 includes a first folding plate 40 arranged between the outer plate 20 and the inner plate 24 of the second side wall 19 .

Referring to FIG. 1, the outer retaining plate 33 has a trapezoidal shape and is connected to the outer plate 20 of the second side wall 19 via a folding line 34 consisting of general ruled lines. The folding line 34 extends in a direction orthogonal to the first side 12a (the folding line 17) and the second side 12b (the folding line 21) of the bottom wall 12. As shown in FIG. The outer retaining plate 33 is bent along the first side wall 16 by folding the blank 10 ′ (shown in FIG. 6 ) along the folding line 34 so that the outer retaining plate 33 is perpendicular to the outer plate 20 . 1 side wall 16.

Referring to the blank in FIG. 6 , a pair of outer holding plates 33 connected to one outer plate 20 protrude in the same direction as the direction in which the first side wall 16 protrudes from the bottom wall 12 . That is, one of the pair of outer holding plates 33 protrudes from the outer plate 20 to one side in the vertical direction (upward in FIG. 6), and the other protrudes from the outer plate 20 to the other side in the vertical direction (downward in FIG. 6). ing.

1, 2 and 4 together, the upper holding plate 35 has a substantially triangular shape in plan view, and is connected to the upper end of the outer holding plate 33 via a folding line 36 made of a general-purpose ruled line. there is Fold line 36 extends parallel to fold line 17 between bottom wall 12 and first side wall 16 . The upper holding plate 35 is bent along the direction in which the bottom wall 12 extends by folding the blank 10 ′ (shown in FIG. 6 ) along the folding line 36 so that the upper holding plate 35 is perpendicular to the outer holding plate 33 . , and protrudes inward to cover the upper end of the first side wall 16 . A tip edge portion 35a of the upper holding plate 35 opposite to the outer holding plate 33 extends in a direction intersecting the first side wall 16 so as to approach the first side wall 16 as the distance from the second side wall 19 increases. ing.

Referring to blank 10' of FIG. A leading edge portion 35a of the upper holding plate 35 extends so as to be inclined with respect to the vertical direction of the blank 10' (vertical direction in FIG. 6). Specifically, the leading end edge 35a (folding line 38, which will be described later) of the upper holding plate 35 extends outward in the longitudinal direction and inward in the lateral direction of the blank 10'.

1 and 4, the inner holding plate 37 has a rectangular shape and is connected to the leading end edge portion 35a of the upper holding plate 35 via a folding line 38 consisting of a general-purpose ruled line. That is, the inner holding plate 37 is connected to the outer holding plate 33 via the upper holding plate 35 . As described above, the folding line 38 (the leading end edge 35a of the upper holding plate 35) extends in a direction intersecting the first side wall 16 so as to approach the first side wall 16 as the distance from the second side wall 19 increases. ing. The inner retaining plate 37 extends toward the bottom wall 12 by folding the blank 10' (shown in FIG. 6) along the fold line 38 so that the inner retaining plate 37 is perpendicular to the upper retaining plate 35. , are arranged inside the first side wall 16 . In other words, as shown in FIGS. 1-4, the normal N of the inner retaining plate 37 extending away from the first side wall 16 extends along the direction in which the bottom wall 12 extends. A normal line N1 in FIG. 3 and a normal line N2 in FIG. 4 indicate in-plane components of the normal line N in each cross section. The inner holding plate 37 supports the upper holding plate 35 by coming into contact with the bottom wall 12 .

1 to 3, the inner holding plate 37 has a side end portion 37a extending from the end of the leading end edge portion 35a of the upper holding plate 35 toward the bottom wall 12 toward the first side wall 16 side. , and the side end 37 a is in contact with the first side wall 16 . That is, the first side wall 16 and the side end portion 37a of the inner holding plate 37 are arranged without a space therebetween, and as the side end portion 37a approaches the second side wall 19, the first side wall 16 and the inner holding plate 37 are separated from each other. 37 is widened. Also, as clearly shown in FIG. 3, the side ends 37a of this embodiment extend in a direction orthogonal to the bottom wall 12. As shown in FIG.

The tip of the inner holding plate 37 is positioned on the upper surface of the bottom wall 12, and a locking piece 39 is protruded from this tip. A locking hole 14 for locking the locking piece 39 is formed in the bottom wall 12 by punching.

Referring to FIG. 6, in the blank 10', the inner retainer plate 37 projects from the upper retainer plate 35 in a direction perpendicular to the fold line 38 in a direction opposite to the outer retainer plate 33. As shown in FIG. That is, the inner holding plate 37 extends outward in the longitudinal direction and outward in the lateral direction. A side end portion 37 a of the inner holding plate 37 extends substantially perpendicularly to the folding line 38 . The side end portion 37a of the inner holding plate 37 of this embodiment has the same dimension as the overall height of the first side wall 16 (see FIG. 1).

As shown in FIGS. 3 and 14 , the folding plate 40 has a vertically elongated rectangular shape that extends from the upper surface of the bottom wall 12 to the lower surface of the edge plate 22 of the second side wall 19 . As clearly shown in FIG. 14, the folding plate 40 is connected to the edge of the inner holding plate 37 positioned toward the second side wall 19 to which the holding portion 32 is continuous via a folding line 41 formed of a reverse ruled line. ing. The folding line 41 extends parallel to the folding line 34 between the outer plate 20 and the outer holding plate 33 .

Referring to the blank of FIG. 6, folding plate 40 protrudes from inner retaining plate 37 toward inner plate 24 in a direction that intersects folding line 41 . The folding plate 40 and the inner plate 24 of this embodiment are separated by providing a punched portion 42 . A punched portion 43 is provided on the folding plate 40 on the side of the upper holding plate 35 to prevent the edge plate 22, the upper holding plate 35, and the folding plate 40 from overlapping each other.

Referring to FIG. 3, the first side wall 16 has a second folding plate positioned between the outer plate 20 and the inner plate 24 of the second side wall 19 so as to be positioned on the outer surface of the first folding plate 40. 44 are provided. As clearly shown in FIG. 11, the folding plate 44 has a substantially rectangular trapezoidal shape and is provided at the end of the first side wall 16 via a folding line 45 consisting of a general-purpose ruled line. The folding line 45 extends parallel to the folding line 41 (shown in FIG. 14) between the inner holding plate 37 and the folding plate 40 .

Referring to the blank of FIG. 6 , folding plate 44 protrudes from first side wall 16 toward outer retaining plate 33 of retaining portion 32 . In this embodiment, the folding plate 44 and the outer holding plate 33 are separated by a punched portion 46 .

3, the folding plate 44 of the first side wall 16 is provided with a protruding plate 47 arranged between the outer plate 20 and the inner plate 24 of the second side wall 19. As shown in FIG. The protruding plate 47 is connected to the end of the folding plate 44 of the first side wall 16 via a folding line 48 consisting of a general-purpose ruled line. The projecting plate 47 extends from the end of the folding plate 44 of the first side wall 16 toward the inner plate 24 . The tip of the projecting plate 47 of this embodiment abuts the inner plate 24 of the second side wall 19 .

Referring to FIG. 6 , in the blank 10 ′ of this embodiment, the protruding plate 47 protrudes longitudinally outward from the first side wall 16 . The dimension of the protruding plate 47 in the vertical direction of the blank 10' (vertical direction in FIG. 6) is preferably substantially equal to the width of the edge plate 22 (horizontal dimension in FIG. 6).

Referring to FIG. 4, the first side wall 16 is provided with a support plate 49 arranged between the outer retaining plate 33 and the inner retaining plate 37 of the retainer 32 . The support plate 49 is connected to the end of the first side wall 16 via a folding line 50 consisting of a general-purpose ruled line, and extends from the end of the first side wall 16 toward the inner holding plate 37 . The tip 49 a of the support plate 49 of this embodiment abuts the inner holding plate 37 of the holding portion 32 .

Referring to FIG. 6, in the blank 10' of this embodiment, the support plate 49 protrudes longitudinally outward from the first side wall 16, is similar in shape to the upper support plate 35, and is smaller than the upper support plate 35. A tip 49a of the plate 49 extends outward in the longitudinal direction and outward in the lateral direction. Specifically, the angle between the tip 49a of the support plate 49 and the folding line 50 is the same as the angle between the folding line 36 and the folding line 38 (the leading edge 35a of the upper holding plate 35 (shown in FIG. 2)). are roughly the same.

Referring to FIG. 1 together with FIG. 6, the outer plate 20 and the inner plate 24 of the second side wall 19 are set so that the corrugated cardboard sheet 1's core 4 (corrugated direction) extends in the vertical direction. In addition, the outer holding plate 33, the inner holding plate 37, and the folding plate 40, which constitute the holding portion 32, are also set so that the center 4 extends in the vertical direction. As a result, when the trays 10 are stacked, the compressive strength is ensured to resist the vertical load applied to the trays 10 .

In addition, in the blank 10' of this embodiment, the shape and size of the upper holding plate 35 are such that the inner holding plate 37 is the maximum longitudinal and horizontal outer dimensions of the other portions of the blank 10' (two-dot chain lines in the figure). L) is set so as not to be larger. Also, the shape and size of the folding plate 40 are set so that the folding plate 40 is not larger than the maximum longitudinal and lateral dimensions of the rest of the blank 10'.

According to the tray 10 configured in this way, since the upper holding plate 35 extends inward from the upper end of the first side wall 16 along the direction in which the bottom wall 12 extends, when the trays 10 are stacked, The upper retaining plate 35 of the lower tray 10 can support the bottom wall 12 of the upper tray 10 . Therefore, even if the first side wall 16 has a single-layer structure and is thin, the positional deviation between the upper tray 10 and the lower tray 10 can be allowed. That is, when the trays 10 are stacked vertically, even if the positions of the upper tray 10 and the lower tray 10 are slightly misaligned, the upper tray 10 is unlikely to fall inside the lower tray 10. The stability of the tray 10 can be improved.

A side end portion 37 a of the inner holding plate 37 is in contact with the first side wall 16 . That is, since the first side wall 16 and the side end portion 37a of the inner holding plate 37 are arranged with no space therebetween, the side end portion 37a of the inner holding plate 37 is arranged apart from the first side wall 16. Articles stored inside the tray 10 are less likely to be damaged than when the tray 10 is inside.

The inner holding plate 37 extends along a plane orthogonal to the bottom wall 12 so that the normal N of the inner holding plate 37 extending away from the first side wall 16 extends along the direction in which the bottom wall 12 extends. extended. Therefore, when the trays 10 are stacked vertically, it is possible to secure the compressive strength against the load applied to the trays 10 in the vertical direction.

A support plate 49 is arranged between the outer holding plate 33 and the inner holding plate 37 of the holding portion 32 , and the support plate 49 extends toward the inner holding plate 37 . 37 is supported by the outer holding plate 33 . Therefore, the movement of the inner holding plate 37 in the direction toward the outer holding plate 33 is restricted by the support plate 49, so that the space between the outer holding plate 33 and the inner holding plate 37 can be maintained, and the articles can be stably placed inside the tray 10. state can be accommodated.

A protruding plate 47 arranged between the outer plate 20 and the inner plate 24 is connected to the folding plate 44 of the first side wall 16 , and the protruding plate 47 extends toward the inner plate 24 . there is Therefore, the inner plate 24 is supported by the outer plate 20 via the protruding plate 47 and the folding plate 44 , and movement toward the outer plate 20 is restricted by the protruding plate 47 and the folding plate 44 . Therefore, since the distance between the inner plate 24 and the outer plate 20 can be maintained, the articles can be stored in the tray 10 in a stable state.

Further, in the tray 10 of this embodiment, the folding plate 40 formed on the holding portion 32 and the folding plate 44 formed on the first side wall 16 are arranged between the outer plate 20 and the inner plate 24 of the second side wall 19. It is The inner plate 24 of the second side wall 19 is supported by the outer plate 20 via two folding plates 40 and 44 , and movement toward the outer plate 20 is restricted by the folding plates 40 and 44 . Therefore, since the distance between the inner plate 24 and the outer plate 20 can be maintained, the articles can be stored in the tray 10 in a stable state.

Since the space between the outer plate 20 and the inner plate 24, that is, the thickness of the second side wall 19 (the width of the edge plate) can be widened by the folding plates 40 and 44, the trays 10 can be stacked and arranged stably. can improve. The first side wall 16 has a single-layer structure, but both end portions of the first side wall 16 have a three-layer structure due to the holding portions 32 . Most of the second side wall 19 has a two-layer structure, but two folding plates 40 and 44 form a four-layer structure at both ends of the second side wall 19 . Therefore, the rigidity of the tray 10 in the direction in which the bottom wall 12 is bent or distorted can be improved.

Next, referring to FIGS. 11 to 14, the operation of assembling the tray 10 shown in FIG. 1 using the blank 10' shown in FIG. 6 will be described.

First, as shown in FIG. 11, the blank 10' (shown in FIG. 6) is mountain-folded (normally folded) along the folding line 17, and the blank 10' is folded so that the folding plate 44 is positioned on the bottom wall 12. A mountain fold is made along the folding line 45 . Next, as shown in FIG. 12, the blank 10' is mountain-folded along the folding line 21, and then the blank 10' is mountain-folded along the folding line 34 as shown in FIG. As a result, the outer plate 20 of the second side wall 19 is arranged outside the second folding plate 44 . Further, the outer holding plate 33 of the holding portion 32 is arranged to overlap the outer side of the first side wall 16 . After that, the blank 10' is mountain-folded along the folding line 50. - 特許庁

Next, as shown in FIG. 14, the blank 10' is mountain-folded along the folding line 36 so that the upper holding plate 35 of the holding portion 32 is positioned on the bottom wall 12, and the upper edge of the first side wall 16 is folded upward. It is covered by a retaining plate 35 . Next, the blank 10 ′ is mountain-folded along the folding line 38 so that the inner retaining plate 37 of the retaining portion 32 faces the bottom wall 12 , and the inner retaining plate 37 is placed on the inner side of the first side wall 16 . Then, the locking piece 39 of the inner holding plate 37 is locked to the locking hole 14 of the bottom wall 12 . Also, the blank 10 ′ is valley-folded (reverse-folded) along the folding line 41 and the first folding plate 40 is arranged inside the second folding plate 44 . Thereafter, the blank 10' is mountain-folded along the folding lines 38. As shown in FIG.

Finally, as shown in FIG. 1, after the blank 10' is mountain-folded along the folding line 23 so that the edge plate 22 of the second side wall 19 is positioned on the bottom wall 12, the inner plate 24 is attached to the bottom wall 12. The blank 10' is mountain-folded at the folding line 25 so as to face. Then, the locking piece 26 of the inner plate 24 is locked to the locking hole 13 of the bottom wall 12 . As a result, the inner plate 24 is arranged inside the outer plate 20, and the second side wall 19 is formed with the folding plate 40 of the holding portion 32 and the folding plate 44 of the first side wall 16 sandwiched therebetween. .

Thus, the tray 10 can be easily assembled manually by sequentially folding predetermined portions of the blank. Further, since the second folding plate 44 connected to the first side wall 16 is sandwiched between the first folding plate 40 and the outer plate 20 of the second side wall 19, the second side wall 19 is unfolded. Prevents directional movement. Moreover, in the blank of the tray 10, the holding portions 32 are formed side by side with the first side wall 16 of the single-layer structure. Therefore, the area of the forming material can be reduced by 20% to 30% compared to the case where the first side wall 16 also has a two-layer structure having an outer plate and an inner plate.

(Modified example of the first embodiment)
FIG. 15 shows a modification of the tray 10 of the first embodiment. The tray 10 shown in FIG. 15 has a configuration in which the second side wall 19 is not provided with positioning projections. 5, when stacking the trays 10 vertically, the bottom wall 12 of the upper tray 10 is supported by the upper holding plate 35 of the lower tray 10, so that the upper tray 10 is less likely to fall inside the tray 10 on the lower side, the stability when stacking the trays 10 vertically can be improved. In addition, since the upper tray 10 and the lower tray 10 are not interlocked, the workability of loading and unloading the trays 10 is improved.

(Second embodiment)
16 to 18 show the tray 10 according to the second embodiment. FIG. 19 is a plan view of blank 10' of tray 10 according to the second embodiment.

Referring to FIG. 16, the inner holding plate 37 of the holding portion 32 of the present embodiment has a trapezoidal shape, the width of which narrows from the tip edge 35 a of the upper holding plate 35 toward the bottom wall 12 . The inner retaining plate 37 is inclined with respect to the bottom wall 12 by folding the blank 10' (shown in FIG. 19) at the fold line 38 so that the inner retaining plate 37 intersects the upper retaining plate 35. , extending toward the bottom wall 12 and disposed inside the first side wall 16. As shown in FIG. That is, as shown in FIGS. 16 to 18, the normal line N of the inner holding plate 37 extends toward the bottom wall 12 opposite the first side wall 16 . A normal N1 in FIG. 17 and a normal N2 in FIG. 18 indicate in-plane components of the normal N in each cross section.

In other words, the inner retainer plate 37 extends from the leading edge 35a of the upper retainer plate 35 toward the bottom wall 12 toward the corner of the tray 10 defined by the bottom wall 12, the first side wall 16 and the second side wall 19. so that it extends obliquely with respect to the bottom wall 12 .

Referring to Figure 19, in the blank 10', the side edges 37a of the inner retaining plate 37 of this embodiment extend generally parallel to the lateral direction. The side end portion 37a of the inner holding plate 37 of this embodiment has a dimension larger than the total height of the first side wall 16 (see FIG. 16).

According to this configuration, the inner retaining plate 37 is inclined with respect to the bottom wall 12 such that the normal N of the inner retaining plate 37 extends toward the bottom wall 12 opposite the first side wall 16 . , and the closer it gets to the bottom wall 12, the wider the space for storing items. Therefore, even when the holding portion 32 is provided with the upper holding plate 35, it is possible to suppress the reduction of the space for storing the article.

In addition, in the blank 10' of the present embodiment, compared to the case where the side end portion 37a of the inner holding plate 37 extends in the direction perpendicular to the leading end edge portion 35a of the upper holding plate 35, the blank 10' The vertical dimension of the inner holding plate 37 can be suppressed. Therefore, the vertical dimension of the upper holding plate 35 can be increased and the area of the upper holding plate 35 can be increased within the range of the maximum external dimensions of other portions of the blank 10' (see the two-dot chain line L in the drawing). . Thereby, the stability when stacking the trays 10 can be improved.

The tray 10 of the present invention is not limited to the configuration of the above embodiment, and various modifications are possible.

The tray 10 is not limited to have a rectangular shape in plan view, and may have, for example, an octagonal shape in plan view.

Further, in the above-described embodiment, an example in which the tray 10 is formed from the cardboard sheet 1 made of paper has been described, but the tray 10 may be formed from the cardboard sheet made of resin. Moreover, the tray 10 may be formed of a single-layer cardboard or a resin sheet without being limited to the corrugated cardboard sheet.

DESCRIPTION OF SYMBOLS 1... Cardboard sheet 2... Front liner 3... Back liner 4... Medium 10... Tray 10'... Tray blank 11... Opening 12... Bottom wall 12a... First side 12b... Second side 13... Locking hole 14... Hook Blind hole 16 First side wall 17 Folding line 19 Second side wall 20 Outer plate 21 Folding line 22 Edge plate 23 Folding line 24 Inner plate 25 Folding line 26 Locking piece 27 Positioning projection 28 Cutting line 29 Folding line 30 Folding line 32 Holding part 33 Outer holding plate 34 Folding line 35 Upper holding plate 35a Tip edge 36 Folding line 37 Inner holding plate 37a Side end 38 Folding line 39 Locking piece 40 First folding plate 41 Folding line 42 Punching part 43 Punching part 44 Second folding plate 45 Folding line 46 Punching part 47 Protruding plate 48 Folding line 49 Support plate 49a Tip 50 Folding line

Claims (7)

a bottom wall having a first side and a second side extending to intersect the first side;
a first side wall of a single-layer structure erected on the first side;
a second side wall having a two-layer structure erected on the second side;
a holding portion that holds the first side wall and the second side wall in an upright state with respect to the bottom wall,
The second side wall is
an outer plate connected to the bottom wall;
an edge plate extending inward from the tip of the outer plate along the direction in which the bottom wall extends;
an inner plate extending from the tip of the edge plate toward the bottom wall and arranged inside the outer plate;
The holding part is
an outer retaining plate connected to the outer plate of the second side wall and arranged outside the first side wall;
a crosspiece extending inward along the direction in which the bottom wall extends from the upper end of the outer holding plate so as to cover the upper end of the first side wall;
an inner holding plate extending toward the bottom wall from the tip edge of the crosspiece on the opposite side of the outer holding plate and arranged inside the first side wall,
the front edge of the crosspiece extends in a direction intersecting the first side wall so as to approach the first side wall as it separates from the second side wall;
The inner holding plate has a first folding plate connected to the edge of the second side wall,
The first folding plate is arranged between the inner plate and the outer plate of the second side wall,
The tray, wherein the first folding plate and the inner plate are separated. The inner holding plate has a side end portion extending from the end of the front edge portion of the crosspiece on the first side wall side toward the bottom wall,
2. The tray of claim 1, wherein said side edge of said inner retainer plate abuts said first sidewall. The inner retaining plate extends along a plane orthogonal to the bottom wall such that a normal line of the inner retaining plate extending away from the first side wall extends along the direction in which the bottom wall extends. A tray according to claim 1 or 2. The inner retaining plate extends at an angle with respect to the bottom wall such that a normal line of the inner retaining plate extending away from the first side wall extends from the leading end edge toward the bottom wall. 3. A tray according to claim 1 or 2. A supporting plate disposed between the outer holding plate and the inner holding plate of the holding portion is continuously provided on the first side wall,
5. The tray according to any one of claims 1 to 4, wherein said support plate extends from the tip of said first side wall toward said inner holding plate. A second folding plate arranged between the outer plate and the inner plate of the second side wall is connected to the first side wall,
A projecting plate arranged between the outer plate and the inner plate of the second side wall is connected to the second folding plate,
The tray according to any one of claims 1 to 5, wherein the projecting plate extends from the tip of the second folding plate toward the inner plate. a bottom wall having a first side and a second side extending in a direction intersecting the first side;
a first side wall connected to the first side;
a second side wall connected to the second side;
a holding part for holding the first side wall and the second side wall in an upright state with respect to the bottom wall,
The second side wall is
an outer plate connected to the second side;
an edge plate connected to the tip of the outer plate;
and an inner plate connected to the tip of the edge plate ,
The holding part is
an outer retaining plate connected to the outer plate of the second side wall and extending in the same direction as the first side wall;
a crosspiece that is connected to the outer holding plate and has a leading end edge that extends obliquely with respect to the direction in which the outer holding plate extends;
an inner holding plate connected to the tip edge of the crosspiece,
The inner holding plate has a first folding plate connected to the edge of the second side wall,
A tray blank, wherein the first folding plate and the inner plate are separated.

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