JP3200091U - Box sheet - Google Patents

Abstract

The present invention provides a box sheet that can form a box that can be sealed relatively easily and can hold a sealed state relatively reliably without using an adhesive tape or the like. A box sheet is formed of a single sheet material, forms a front wall, and has a substantially rectangular front plate 3 in which a slit substantially parallel to the lower edge is formed in the vicinity of the lower edge in the assembled state. The front plate 3 extends from the upper edge in the assembled state, and is folded on the inner surface of the front plate 3 in the assembled state, and extends from the leading edge in the extending direction of the folded piece 10 and is stacked on the bottom in the assembled state. Tongue plate 11, a substantially square rear plate 1 constituting the rear wall, a lid plate 7 extending from the upper edge in the assembled state of the rear plate 1, and a front end of the lid plate 7 in the extending direction An extension piece 8 extending from the edge and overlaid on the outer surface of the front plate 3 in an assembled state, and an insertion piece 9 extending from the leading edge in the extending direction of the extension piece 8 and inserted into the slit in the assembled state In the insertion piece 9, an opening 20 into which the tongue piece 11 is fitted is formed. [Selection] Figure 1

Description

  The present invention relates to a box sheet.

  The box for product packaging is required to be easily assembled and to maintain the sealed state until it reaches the hand of the product purchaser. In particular, in Internet sales or the like that handles a small variety of products, it is difficult to automate the packaging of products due to cost problems, so it is important that the box can be easily assembled and sealed.

  A general packaging box body is sealed using an adhesive tape to maintain a sealed state during transportation. However, if the adhesive tape is applied incorrectly, it is not easy to reapply, and there is a risk of loss of packaging material. For this reason, cautiousness is required for sealing with an adhesive tape.

  As a packaging box that can maintain the sealed state without using an adhesive tape, in a box that is configured to insert a flap extending from the leading edge of the cover plate in the extending direction along the side plate into the box, A convex tongue piece is formed on the base edge side of the flap, a folded piece is extended on the upper edge of the side plate into which the flap is inserted along the inner surface, and a slit that engages with the flap tongue piece is formed on the folded piece. What has been provided has been proposed (see JP 2014-108819 A).

  In the box described in the above publication, if the flap is not inserted in a state where the tongue piece is held in a state of being raised from the flap, the flap is locked by fitting into the slit of the tongue piece, that is, sealed. There is a risk that holding the box will be uncertain.

JP 2014-108819 A

  In view of the above circumstances, the present invention provides a sheet for a box that can form a box that can be sealed relatively easily and can hold a sealed state relatively reliably without using an adhesive tape or the like. The task is to do.

  The invention made to solve the above problems is a box sheet that can be assembled into a box having at least a bottom part, a cover part, a front wall and a rear wall, and is formed from a single sheet material, A front wall that forms a front wall and has a substantially rectangular front plate in which a slit substantially parallel to the lower edge is formed in the vicinity of the lower edge in the assembled state, and extends from the upper edge in the assembled state of the front plate. A folded piece overlaid on the inner surface of the plate, a tongue piece extending from the leading edge in the extending direction of the folded piece and overlaid on the bottom in an assembled state, a substantially square rear plate constituting the rear wall, and A cover plate extending from the upper edge in the assembled state of the rear plate, constituting the lid portion, an extension piece extending from the leading edge in the extending direction of the cover plate, and overlaid on the outer surface of the front plate in the assembled state; The extension piece extends from the leading edge in the extending direction, and the slipper is in the assembled state. And a insertion piece to be inserted into said tongue, characterized in that the opening to be fitted is formed on the insertion piece.

  The box sheet is relatively easy by inserting an insertion piece extending from the protruding edge of the extension piece extending from the lid plate into a slit formed near the lower edge of the front plate. A box that can be sealed can be formed. Further, the box formed by assembling the box sheet extends from the leading edge in the extending direction of the folded piece stacked on the inner surface of the front plate extending from the upper edge of the front plate, and is stacked on the bottom in the assembled state. By fitting the tongue piece to be fitted into the opening formed in the insertion piece, it is possible to prevent the insertion piece from coming out of the slit. Therefore, the box sheet can form a box that can hold the sealed state relatively reliably without using an adhesive tape or the like. The term “near the lower edge” means a range in which the distance from the lower edge is 3 times or less, preferably 2 times or less the average thickness of the sheet material, and includes the case where the slit includes the lower edge. “Substantially parallel” means that the angle between the two is 5 ° or less, preferably 3 ° or less. In addition, “substantially square” means having an area of 90% or more, preferably 95% or more of the area of the smallest circumscribed rectangle.

  It is preferable to further include a bottom flange that extends from the leading edge in the extending direction of the folded piece so as to be positioned on both sides of the tongue piece and is superimposed on the bottom portion in an assembled state. As described above, the box sheet is assembled by further including a bottom flange that extends from the leading edge of the folded piece in the extending direction so as to be positioned on both sides of the tongue piece and is superimposed on the bottom portion in the assembled state. Since the item accommodated in the box is placed on the bottom flange, it is possible to prevent the item in the box from coming into contact with the leading edge of the insertion piece and hindering insertion of the insertion piece.

  The bottom flange may surround the extending side of the tongue. As described above, the bottom flange is formed so as to surround the extending side of the tongue piece, so that it is possible to more reliably prevent the article in the box from obstructing the insertion of the insertion piece.

  The maximum width in the direction along the base end edge of the folded piece may be larger than the length of the lower edge of the front plate. Thus, the maximum width in the direction along the base end edge of the folded piece is larger than the length of the lower edge of the front plate, so that the side walls of the box are formed by assembling the box sheet on both side edges of the folded piece. The folded piece can be held in close contact with the inner surface of the front plate. Thereby, a tongue piece can be arrange | positioned comparatively correctly in the predetermined position of the vicinity of a slit, and the fitting of the tongue piece to the opening of an insertion piece can be made more reliable.

  A double ruled line may be formed at the boundary between the front plate and the folded piece. Thus, by forming the double ruled line at the boundary between the front plate and the folded piece, it is easy to suppress the restoration due to the elasticity of the sheet material and to adhere the folded piece to the inner surface of the front plate. .

  As described above, the box sheet of the present invention can be sealed relatively easily, and can form a box that can hold the sealed state relatively reliably without using an adhesive tape or the like.

It is a typical top view (development drawing) which shows the sheet for boxes of one embodiment of the present invention. It is a typical perspective view which shows the box formed by assembling the sheet | seat for boxes of FIG. It is typical sectional drawing of the box of FIG. It is a typical top view (development figure) which shows the sheet | seat for boxes of embodiment different from FIG. 1 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[First embodiment]
A box sheet according to an embodiment of the present invention shown in FIG. 1 is formed of a single sheet material, and includes a bottom portion, a lid portion, a front wall, a rear wall, and a pair of side walls as shown in FIG. Can be assembled into a box. In FIG. 1, a thick solid line indicates an edge obtained by cutting the sheet material (a portion that appears as a broken line is a portion obtained by cutting the sheet material in a perforated shape), and a thin solid line indicates an assembly of the box sheet of the sheet material. The ruled line formed by embossing on the surface on the side mainly disposed inside the box in the state is shown.

  As the sheet material constituting the box sheet, for example, a corrugated cardboard sheet, a plastic board, a cardboard or the like can be used, and among them, a corrugated cardboard sheet is preferably used.

  The corrugated cardboard sheet may be a so-called double flute in which a core is sandwiched between three liners as well as a sheet having both sides of a core sandwiched between a pair of liners. It may be a so-called single-sided cardboard in which a liner is stuck only on one side.

  The box seat shown in FIG. 1 constitutes a substantially square rear plate 1 constituting the rear wall in the assembled box body, a substantially square first side plate 2 constituting one of the pair of side walls, and the front wall. A substantially square front plate 3, a substantially square second side plate 4 constituting the other of the pair of side walls, and a joint 5 connecting the rear wall 1 and the second side plate 4 in this order in the left-right direction. It is provided with a peripheral wall constituting portion 6 that is provided continuously and constitutes the peripheral wall portion in an assembled state.

  The box sheet extends from the upper edge in the assembled state of the rear plate 1, and the cover plate 7 constituting the lid portion in the assembled box body, and the leading edge of the cover plate 7 in the extending direction. An extension piece 8 that is extended and overlaid on the outer surface of the front plate 3 in an assembled state, an insertion piece 9 that extends from the leading edge of the extension piece 8 in the extension direction, and an extension from the upper edge of the front plate 3 A folded piece 10 that is superimposed on the inner surface of the front plate 3 in the assembled state, a tongue piece 11 that extends from the leading edge in the extending direction of the folded piece 10 and is superimposed on the bottom of the box in the assembled state, and the tongue A bottom flange 12 is further provided that extends from the leading edge of the folded piece 10 in the extending direction so as to be positioned on both sides of the piece 11 and is superimposed on the bottom of the box in the assembled state. The box sheet further includes lid flaps 13 and 14 extending from the upper edges of the first side plate 2 and the second side plate 4, respectively.

  In the present specification, “upper” and “lower” mean directions in which the lid side is “upper” and the bottom side is “lower” in the assembled state of the box sheet, Means a direction perpendicular to the vertical direction.

  The box sheets extend from the bottom edges of the main bottom flaps 15 and 16 extending from the lower edges of the rear plate 1 and the front plate 3, respectively, and from the lower edges of the first side plate 2 and the second side plate 4, respectively. Further, auxiliary bottom flaps 17 and 18 are provided. The main bottom flaps 15 and 16 and the auxiliary bottom flaps 17 and 18 are combined to form the bottom portion in the assembled box.

  The front plate 3 is formed with a slit 19 substantially parallel to the lower edge in the vicinity of the lower edge. The insertion piece 9 is inserted into the slit 19 in an assembled state. Further, as shown in FIG. 3, the insertion piece 9 has an opening 20 into which the tongue piece 11 is fitted when the insertion piece 9 is inserted into the slit 19.

(Surrounding wall component)
The peripheral wall constituting portion 6 is folded between the rear plate 1 and the first side plate 2 and between the front plate 3 and the second side plate 4, and the joint 5 is bonded to the rear surface of the end portion of the rear plate 1. Are connected endlessly. The bonding between the rear plate 1 and the joint 5 can be performed using, for example, an adhesive or a stapler. The box sheet is usually provided to the user in a state in which the rear plate 1 and the joint 5 are pasted together, that is, in a folded state in which the peripheral wall constituting portion 6 is not expanded into a rectangular tube shape.

<Front plate>
The front plate 3 is formed with a slit 19 substantially parallel to the lower edge in the vicinity of the lower edge. That is, the slit 19 is formed so as to extend in the left-right direction along the lower edge of the front plate 3. The slit 19 is preferably formed so as to divide the lower edge of the front plate 3 so that the insertion piece 9 can be brought into close contact with the upper surface of the main bottom flap 16 in the assembled state.

(Slit 19)
It is preferable that the length of the slit 19 in the direction along the lower edge of the front plate 3 is substantially equal to the length of the base end edge of the insertion piece 9. Thus, since the length of the slit 19 in the left-right direction is substantially equal to the length of the base edge of the insertion piece 9, both end edges of the slit 19 are on both sides of the insertion piece 9 in the assembled state of the box sheet. The edge can be pinched, and the play of the insertion piece 9 in the left-right direction can be reduced.

  It is preferable that the length of the slit 19 is substantially equal to the length of the base end edge of the insertion piece 9. If the length of the slit 19 is smaller than the length of the base end edge of the insertion piece 9, it may be difficult to insert the insertion piece 9 into the slit 19. On the contrary, if the length of the slit 19 is larger than the length of the base end edge of the insertion piece 9, there is a possibility that a gap between the boxes formed by assembling the box sheet becomes unnecessarily large, or the box sheet. There is a possibility that the box body formed by assembling may be easily deformed.

  Further, the slit 19 is preferably formed so that the width of the central portion (height in the vertical direction) is large and the width of both end portions is small. That is, the slit 19 facilitates the insertion of the insertion piece 9 by increasing the width of the central portion, and lowers the width of both ends to reduce the upper and lower sides of the insertion piece 9 in the assembled state of the box sheet. Both end portions of the insertion piece 9 can be sandwiched so as to reduce the play in the direction.

  The lower limit of the width of both ends of the slit 19 is preferably 1 times the average thickness of the sheet material forming the box sheet, and more preferably 1.5 times. On the other hand, the upper limit of the width of both ends of the slit 19 is preferably three times the average thickness of the sheet material forming the box sheet, and more preferably 2.5 times. When the widths of both ends of the slit 19 are less than the lower limit, it may not be easy to insert the insertion piece 9. On the contrary, when the width of the both ends of the slit 19 exceeds the above upper limit, the gap of the box formed by assembling the box sheet may become unnecessarily large, or the tongue piece 11 may be removed from the opening 20 of the insertion piece 9. There is a risk of desorption.

  The lower limit of the difference between the width of the central portion of the slit 19 and the width of both ends is preferably 0.5 times the average thickness of the sheet material forming the box sheet, and more preferably 1 time. On the other hand, the upper limit of the difference between the width of the central portion of the slit 19 and the width of both ends is preferably three times the average thickness of the sheet material forming the box sheet, and more preferably 2.5 times. When the difference between the width of the center portion of the slit 19 and the width of both end portions is less than the lower limit, the insertion of the insertion piece 9 into the slit 19 may not be facilitated. On the contrary, when the difference between the width of the central portion of the slit 19 and the width of both end portions exceeds the above upper limit, there is a possibility that the gap between the boxes formed by assembling the box sheet becomes unnecessarily large.

<Cover plate>
The cover plate 7 is formed in a square shape whose extension length is substantially equal to the length in the left-right direction of the side plates 2, 4, and is formed from a peripheral wall constituting portion 6 in a box formed by assembling the box sheet. The upper end of the part is sealed. More specifically, the lid plate 7 is folded on the upper surfaces of the lid flaps 13 and 14 with the lid flaps 13 and 14 of the box formed by assembling the box sheet folded inward.

<Extension piece>
The extension piece 8 connects the lid plate 7 and the insertion piece 9, and when the insertion piece 9 is locked in the inserted state into the slit 19, the lid plate 7 seals the upper opening of the box. Hold the box state. Therefore, the extension length of the extension piece 8 from the lid body 7 is substantially equal to the height of the front plate 3.

  As the shape of the extension piece 8, a trapezoidal shape having a distal end edge in the extending direction of the cover plate 7 as a lower bottom and a base end edge of the insertion piece 9 as an upper bottom, preferably the insertion piece 9 as the front wall 3. It can be made into an isosceles trapezoid shape so as to be arranged at the center in the width direction.

<Insert piece>
As the outer shape of the insertion piece 9, the vicinity of the base end edge has a certain width so that the box 19 formed by assembling the box sheet can be securely held by the slit 19 in a sealed state, and It is preferable that the width is gradually reduced toward the extension-side tip so that it can be easily inserted into the slit 19.

  As a minimum of the maximum extension length from the extension piece 8 of the insertion piece 9, 25 mm is preferable and 30 mm is more preferable. On the other hand, as an upper limit of the maximum extension length from the extension piece 8 of the insertion piece 9, 80 mm is preferable and 60 mm is more preferable. If the maximum extension length of the insertion piece 9 from the extension piece 8 is less than the lower limit, it may be difficult to form the opening 20 that can be securely fitted to the tongue piece 11. Conversely, if the maximum extension length of the insertion piece 9 from the extension piece 8 exceeds the above upper limit, the original plate size of the sheet material from which the box sheet is cut out may become unnecessarily large. There is a risk of interference with the auxiliary bottom flap 18 or the like.

  As a minimum of the width in the base end edge of insertion piece 9, 5 cm is preferred and 7 cm is more preferred. On the other hand, as an upper limit of the width | variety in the base end edge of the insertion piece 9, 15 cm is preferable and 10 cm is more preferable. When the width at the base end edge of the insertion piece 9 is less than the lower limit, the size of the opening 20 and thus the tongue piece 11 becomes insufficient, and the sealed state of the box formed by assembling the box sheet is not good. May be certain. On the contrary, when the width at the base edge of the insertion piece 9 exceeds the above upper limit, the length of the slit 19 may be increased, so that the strength of the box formed by assembling the box sheet may be insufficient. is there.

(Opening)
The opening 20 of the insertion piece 9 is preferably shaped so that the peripheral edge on the front end side in the extending direction follows the front end edge in the extending direction of the tongue piece 11 in order to securely engage the tongue piece 11. Further, the opening 20 has a shape in which the width in the left-right direction along the base end edge of the insertion piece 9 monotonously decreases toward the extension side of the insertion piece 9 in order to reliably engage the tongue piece 11. It is preferable.

  Moreover, it is preferable that the opening 20 is formed in a straight line in which the peripheral edge on the base end edge side of the insertion piece 9 is substantially parallel to the base end edge of the insertion piece 9 so that the tongue piece 11 can be easily received. Moreover, it is preferable that the opening 20 is formed with a space between the base end edge of the insertion piece 9 so as not to be exposed from the slit 19. The lower limit of the average distance between the opening 20 and the base edge of the insertion piece 9 is preferably twice the average thickness of the sheet material forming the box sheet, and more preferably three times. On the other hand, the upper limit of the average distance between the opening 20 and the base edge of the insertion piece 9 is preferably 10 times the average thickness of the sheet material forming the box sheet, and more preferably 8 times. When the average space | interval of the opening 20 and the base end edge of the insertion piece 9 is less than the said minimum, there exists a possibility that the clearance gap between the boxes which assemble the said sheet | seat for boxes concerned may become large. Conversely, when the average distance between the opening 20 and the base end edge of the insertion piece 9 exceeds the above upper limit, the peripheral edge of the opening 20 on the extension piece 8 side abuts on the tongue piece 11, and the tongue piece 11 opens to the opening 20. There is a risk of hindering the fitting.

  The lower limit of the maximum width of the opening 20 (preferably the length of the end edge on the base end side of the insertion piece 9) is preferably 2 cm, and more preferably 3 cm. On the other hand, the upper limit of the maximum width of the opening 20 is preferably 10 cm, and more preferably 7 cm. When the maximum width of the opening 20 is less than the lower limit, the width of the tongue piece 11 becomes small, and there is a possibility that the sealed state of the box formed by assembling the box sheet may be uncertain. On the other hand, when the maximum width of the opening 20 exceeds the above upper limit, the insertion piece 9 may be unnecessarily enlarged or the strength of the insertion piece 9 may be insufficient.

  As a minimum of the maximum length of the extension direction of the insertion piece 9 of the opening 20, 8 mm is preferable and 12 mm is more preferable. On the other hand, the upper limit of the maximum length of the insertion piece 9 of the opening 20 in the extending direction is preferably 5 cm, and more preferably 3 cm. When the maximum length of the opening 20 in the extending direction of the insertion piece 9 is less than the lower limit, the fitting of the tongue piece 11 may be uncertain. On the contrary, when the maximum length of the insertion piece 9 in the opening 20 in the extending direction exceeds the upper limit, the insertion piece 9 may be unnecessarily enlarged or the strength of the insertion piece 9 is insufficient. There is a fear.

(Easy opening part)
The box sheet has an easy-to-open portion 21 that crosses the box sheet in the cover plate 7 and the extension piece 8, that is, between the upper edge of the rear plate 1 and the base edge of the insertion piece 9. Is done. A box formed by assembling the box sheet is formed by cutting the sheet material in the easy-to-open portion 21, and the insert piece 9 together with a part of the cover plate 7 and the extension piece 8 depending on the configuration of the easy-open portion. The remaining part of the cover plate 7 can be raised from the other part of the sheet for use and opened relatively easily.

  The easy-to-open portion 21 includes an easy-to-cut line 22 in which a sheet material forming the box sheet is intermittently cut, and a break start piece 23 that is connected to the easy-to-cut line 22 and is formed so as to be gripped by the user. It can be set as the structure which has.

  Specifically, in the box sheet of FIG. 1, the easy-to-open portion 21 includes a knob-shaped break start piece 23 formed on the extension piece 8 that is pulled upward, and an outer side from the left and right sides of the upper end of the break start piece 23. A pair of easy-to-cut lines 22 extending obliquely upward and reaching straight to the side edge of the lid plate 7 as it is. The easy-opening portion 21 can raise the lid plate 7 above the rear plate 1 at the same time as inducing the cutting of the easy-to-cut line 22 by the user holding the breaking start piece 23 and pulling it upward. There are few actions for opening.

<Folded piece>
The folded piece 10 is folded so as to be overlapped with the inner surface of the front plate 3, thereby arranging the base end edge of the tongue piece 11 at the upper part of the slit 19. In order to facilitate this folding and suppress the restoration due to the elasticity of the sheet material forming the box sheet, double ruled lines 24 are formed at the boundary between the folded piece 10 and the front plate 3 as shown in FIG. Preferably it is formed. The width of the double ruled line 24 (the interval between ruled lines) is preferably 1.5 to 3 times the average thickness of the sheet material forming the box sheet.

  The folded piece 10 has a width in the base edge direction (left-right direction) larger than the length of the lower edge of the front plate 3 (width in the left-right direction) at least partially, preferably on the distal end side in the extending direction. Is preferred. In this way, by making the maximum length in the left-right direction of the folded piece 10 larger than the length of the lower edge of the front plate 3, the side edges of the folded piece 10 are pressed against the inner surfaces of the side plates 2, 4. Can be held on the inner surface of the front plate 3. In particular, if the width in the left-right direction from the region in the vicinity of the leading edge of the folded piece 10 to the region in the vicinity of the proximal edge of the bottom flange 12 is made larger than the length of the lower edge of the front plate 3, The bending of 12 can improve the buckling strength in the left-right direction of the portion pressed against the inner surface of the side plates 2, 4, and the folded state of the folded piece 10 can be more reliably maintained.

<Tongue piece>
The tongue piece 11 is urged toward the bottom of the box body by the elasticity of the sheet material forming the box sheet in the assembled state of the box sheet, and the opening 20 of the insertion piece 9 inserted into the slit 19. The insertion piece 9 is prevented from being pulled out from the slit 19. In other words, once the box 9 formed by assembling the box sheet is inserted into the slit 19 in the sealed state, the insert 9 cannot be pulled out from the slit 19 by ordinary means. Therefore, the box formed by assembling the box sheet can hold the sealed state relatively reliably without using, for example, an adhesive tape.

  The tongue piece 11 is good to have a front-end | tip edge in the shape of a mountain | corner so that the position of the left-right direction with the opening 20 may be match | combined, and to have a corner | angular part at a front-end | tip. As an angle of the front-end | tip of the tongue piece 11, it can be set as 100 degrees or more and 150 degrees or less, for example. If the angle of the tip of the tongue piece 11 is less than the lower limit, the strength of the tip of the tongue piece 11 may be insufficient. On the contrary, when the angle of the tip of the tongue piece 11 exceeds the upper limit, the alignment effect between the tongue piece 11 and the opening 20 may be insufficient.

<Bottom flange>
When the insertion piece 9 is inserted into the slit 19, the bottom flange 12 covers the upper side of the insertion piece 9, and an article accommodated in a box formed by assembling the box sheet comes into contact with the insertion piece 9. To prevent the insertion piece 9 from being inserted. Accordingly, the bottom flange 12 only needs to have an extension length that is at least the extension length of the tongue piece 11 from both the left and right sides of the tongue piece 11 at the leading edge of the folding piece 10 in the extension direction.

  Moreover, in order to prevent the insertion piece 9 from interfering with the goods accommodated in the box, the bottom flange 12 more preferably surrounds the extending side of the tongue piece 11 as shown in FIG. In other words, the insertion piece 9 is formed by being separated from the bottom flange 12 by a cutting line formed in the bottom flange 12 so as to bend and connect two points of the leading edge in the extending direction of the folded piece 10. The

  Further, as shown in FIG. 1, the bottom flange 12 has a region near the tip edge of the tongue piece 11 so as not to hinder peristalsis of the tongue piece 11 with respect to the bottom flange 12 about the tip edge in the extending direction of the folded piece 10. It is preferable that it has been excised.

  Further, a perforated cut may be provided at the base end edge of the bottom flange 12. Thereby, the friction at the time of inserting the insertion piece 9 can be reduced by reducing the elasticity of the sheet | seat material which forms the said sheet | seat for boxes, and reducing the press-contact force which goes to a bottom part.

<Cover flap>
The lid flaps 13 and 14 are bent with respect to the side plates 2 and 4 in the box formed by assembling the box sheet, and seal the upper opening of the box so that the leading edges of each other extend. Stop. That is, the lid flaps 13 and 14 constitute an inner lid disposed inside the lid plate 7.

  The lid flaps 13 and 14 are formed with a notch in the center of the end on the extending side so that the user can put his / her finger on the opening.

<Bottom flap>
The main bottom flaps 15 and 16 and the auxiliary bottom flaps 17 and 18 are configured to form a so-called one-touch type bottom. Specifically, the folded portions 25 and 26 are defined on one side of the main bottom flaps 15 and 16 by ruled lines that pass through the end of the base edge and are inclined by 45 ° to the base edge. Yes. In the box sheet, the main bottom flaps 15 and 16 and the auxiliary bottom flaps 17 and 18 are folded back to the inner surface side of the peripheral wall constituting portion 6, and the folded portions 25 and 26 are further turned to the outer surface side (peripheral wall constitution). The outer surfaces of the auxiliary bottom flaps 17 and 18 are bonded in advance to the inner surfaces of the folded portions 25 and 26. Accordingly, the box sheet is provided to the user in a folded state, and the main bottom flaps 15 and 16 and the auxiliary bottom flaps 17 and 18 are appropriately combined by the user expanding the peripheral wall constituting portion 6 into a rectangular tube shape. To form the bottom of the box.

  Further, as described above, the main bottom flaps 15 and 16 and the auxiliary bottom flaps 17 and 18 are folded to the inner surface side of the peripheral wall constituting portion 6, so that the main bottom flaps 15 and 16 and the auxiliary bottom flaps 17, Double ruled lines are formed at the boundaries between the rear plate 1, the front plate 3, the front plate 3, and the side plates 2 and 4 in order to more reliably bend the sheet material.

<Advantages>
The box sheet is formed by inserting an insertion piece 9 extending from the protruding edge of the extension piece 8 extending from the lid plate 7 into a slit 19 formed in the vicinity of the lower edge of the front plate 3. A box that can be sealed relatively easily can be formed.

  Further, the box formed by assembling the box sheet prevents the insertion piece 9 from coming out of the slit 19 by fitting the tongue piece 11 into the opening 20 formed in the insertion piece 9. Can do. Therefore, the box sheet can form a box that can hold the sealed state relatively reliably without using an adhesive tape or the like.

[Second Embodiment]
The box sheet of the embodiment different from FIG. 1 of the present invention shown in FIG. 4 is formed of a single sheet material and has a bottom portion, a lid portion, and a peripheral wall portion including a front wall, a rear wall, and a pair of side walls. Can be assembled into a box.

  As the sheet material constituting the box sheet of FIG. 4, the same material as the sheet material constituting the box sheet of FIG. 1 can be used.

  The box sheet of FIG. 4 includes a substantially rectangular bottom plate 31 that constitutes the bottom portion in the assembled box, and a front plate 32 that extends from the front edge of the bottom plate 31 and constitutes the front wall in a substantially rectangular shape. A rear plate 33 extending from the rear edge of the bottom plate 31 and forming the rear wall in a substantially square shape, and a pair of substantially square side plates 34 and 35 extending from both side edges of the bottom plate 31 are provided.

  The front plate 32 is provided with a notch 36 in the vicinity of the lower edge for forming a slit substantially parallel to the lower edge in the assembled state. More specifically, the notch 36 includes a straight portion extending in the left-right direction substantially parallel to the lower edge of the front plate 32 and a pair of end edges extending downward from both ends of the straight portion and reaching the lower edge. Have. When the box sheet is assembled, the front plate 32 is raised with respect to the bottom plate 31 while leaving a portion surrounded by the notches 36, so that a slit is formed in the vicinity of the lower edge of the front plate 32. On the other hand, a region surrounded by the notches 36 extends from the bottom plate 31 in an assembled state, forms a guide protrusion that protrudes forward from the front plate 32, and guides an insertion piece to be described later so that it can be easily inserted into the slit.

  4 extends from the upper edge of the front plate 32 and is folded on the inner surface of the front plate 31 in the assembled state, and extends from the leading edge of the folded piece 37 in the extending direction. A tongue piece 38 that is superimposed on the bottom plate 31 in a state, and extends from the leading edge of the folding piece 37 so as to be positioned on both sides of the tongue piece 38, surrounds the extension side of the tongue piece 38, and in an assembled state A bottom flange 39 overlaid on the bottom plate 31 and an upper edge of the rear plate 33, a substantially rectangular lid plate 40 constituting the lid part, and a leading edge of the lid plate 40 in the extending direction are assembled and assembled. It further includes an extension piece 41 that is superimposed on the outer surface of the front plate 32 in a state, and an insertion piece 42 that extends from the leading edge in the extension direction of the extension piece 41 and is inserted into the slit of the front plate 32.

  The insertion piece 42 is formed with an opening 43 into which the tongue piece 38 is fitted when the insertion piece 42 is inserted into the slit of the front plate 32 in the assembled state of the box sheet. In the box formed by assembling the box sheet by fitting the tongue piece 38 into the opening 43, once the insertion piece 42 is inserted into the slit of the front plate 32, the insertion piece 42 can be pulled out from the slit. It becomes difficult. That is, the box formed by assembling the box sheet can be sealed without using any other member such as an adhesive tape by simply inserting the insertion piece 42 into the slit of the front plate 32.

  4 extends from the upper flanges 44 and 45 of the pair of side plates 34 and 35 and the side edges of the pair of side plates 34 and 35 on the front plate 32 side. A pair of folding pieces 46 and 47 and a pair of connection pieces 48 and 49 extending from side edges on the rear plate 33 side of the pair of side plates 34 and 35 are further provided.

  The pair of lid flanges 44 and 45 are in contact with the lower surfaces on both sides of the lid plate 40 in a sealed state of the box body formed by assembling the box sheet, and reduce the gap between the box bodies.

  The pair of folding pieces 46 and 47 are sandwiched between the front plate 32 and the folded piece 37 in the assembled state of the box sheet, so that the front side portions of the pair of side plates 34 and 35 are brought upright with respect to the bottom plate 31. Hold. In addition, the folding pieces 46 and 47 are notched so that they do not interfere with the insertion piece 42 and overlap with the slits of the front plate 32 in the assembled state.

  The pair of connection pieces 48 and 49 are arranged so as to overlap the inner surface of the rear plate 33 in an assembled state of the box sheet, and are formed so as to be engaged with each other. That is, in the box formed by assembling the box sheet, the connection pieces 48 and 49 are engaged with each other, so that the rear portions of the pair of side plates 34 and 35 are held upright with respect to the bottom plate 31.

  As for the configuration of the folded piece 37, the tongue piece 38, the bottom flange 39, the cover plate 40, the extension piece 41 and the insertion piece 42 in the box sheet of FIG. 4, the folded piece 10 and the tongue piece 11 in the box sheet of FIG. The bottom flange 12, the cover plate 7, the extension piece 8, and the insertion piece 9 can be the same.

[Other Embodiments]
The said embodiment does not limit the structure of this invention. Therefore, in the above-described embodiment, components of each part of the above-described embodiment can be omitted, replaced, or added based on the description and common general knowledge of the present specification, and they are all interpreted as belonging to the scope of the present invention. Should.

  The structure of the bottom part in the said box sheet | seat is not specifically limited, For example, arbitrary structures, such as what is called an American lock type, are employable. In addition, the structure for forming the peripheral wall in the assembled state in the box sheet is not particularly limited, and for example, an arbitrary structure such as a structure in which a connection piece is connected between the front plate and the rear plate and the side plate is adopted. can do.

  The box sheet may not have a bottom flange.

  In addition, as a means for holding the folded piece folded back to the inner surface of the front plate in the box sheet, in addition to making the folded piece maximum width larger than that of the front plate, for example, a slit is formed in the bottom plate and folded. Arbitrary structures, such as the structure which forms the convex part engaged with the said slit in the extension side edge part of a piece, are employable. Moreover, you may abbreviate | omit the means to hold | maintain the state which turned up the folding piece on the inner surface of the front board.

  In the box sheet, the easy-to-open portion is not essential. Moreover, it does not specifically limit as a structure of an opening easy part, For example, arbitrary structures, such as a zipper formed from a pair of easy break line which crosses an extension piece or a cover board in the left-right direction, are employable.

  The box sheet according to the present invention can be suitably used as a packaging box.

DESCRIPTION OF SYMBOLS 1 Rear plate 2, 4 Side plate 3 Front plate 5 Joint 6 Peripheral wall structure part 7 Lid plate 8 Extension piece 9 Insert piece 10 Folding piece 11 Tongue piece 12 Bottom flange 13, 14 Lid flaps 15, 16 Main bottom flaps 17, 18 Auxiliary bottom flap 19 Slit 20 Opening 21 Opening easy part 22 Easy cutting line 23 Break start piece 24 Double ruled line 25, 26 Folding part 31 Bottom plate 32 Front plate 33 Rear plate 34, 35 Side plate 36 Cutting 37 Folding piece 38 Tongue piece 39 Bottom Flange 40 Cover plate 41 Extension piece 42 Insertion piece 43 Opening 44, 45 Cover flange 46, 47 Insertion piece 48, 49 Connection piece

Claims (5)

A box sheet that can be assembled into a box having at least a bottom part, a cover part, a front wall and a rear wall, and is formed from a single sheet material,
A front plate having a substantially square shape, in which a slit substantially parallel to the lower edge is formed in the vicinity of the lower edge in the assembled state, while constituting the front wall;
A folded piece that extends from the upper edge in the assembled state of the front plate and is superimposed on the inner surface of the front plate in the assembled state;
A tongue piece extending from the leading edge in the extending direction of the folded piece and overlaid on the bottom in an assembled state;
A substantially square rear plate constituting the rear wall;
A lid plate extending from the upper edge in the assembled state of the rear plate, and constituting the lid portion;
An extension piece extending from the leading edge of the lid plate in the extending direction, and overlaid on the outer surface of the front plate in an assembled state;
An extension piece extending from the leading edge of the extension piece in the extending direction and inserted into the slit in an assembled state,
An opening for fitting the tongue piece into the insertion piece is formed.   The box seat according to claim 1, further comprising a bottom flange that extends from an extended side edge of the folded piece so as to be positioned on both sides of the tongue piece and is superimposed on the bottom portion in an assembled state.   The box seat according to claim 2, wherein the bottom flange surrounds the extending side of the tongue piece.   The box sheet according to claim 1, 2 or 3, wherein a maximum width in a direction along a base end edge of the folded piece is larger than a length of a lower edge of the front plate.   The box sheet according to any one of claims 1 to 4, wherein a double ruled line is formed at a boundary between the front plate and the folded piece.

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