JP2016166044A - Cover fastening tool of corrugated cardboard box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover fastening tool of a corrugated cardboard box which temporarily locks an outer cover in a closed posture with an inner cover so as not to open, brings the inner cover to a horizontal posture when it is in a downwardly inclined posture before temporary lock, and facilitates push operation in attachment and pull operation in detachment to the corrugated cardboard box.SOLUTION: A cover fastening tool of a corrugated cardboard box comprises: an upper plate part 2 placed along top faces of closed outer covers 22A, 22B of a corrugated cardboard box 20; an inner cover pressing part 4e placed along an undersurface of an inner cover 24A; and a connection plate part 3 connecting the upper plate part 2 and the inner cover pressing part 4e. The inner cover pressing part 4e is constituted by a surface part including a wide top part. The connection plate part 3 stand downward from a rear part of a central position which substantially divides an undersurface of the upper plate part 2 into two, and reaches the inner cover pressing part 4e in front of the upper plate part 2. The upper plate part 2 is provided with operation parts 2b, 2c which facilitate operation in a push direction and a pull direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cardboard box lid fastener for temporarily fastening a pair of outer lids provided on the upper end of a cardboard box in a single-supported state together with one inner lid.

  Recycling that uses a cardboard box a plurality of times as a storage box or a return box is performed at many production sites and distribution sites. There are also many opportunities to recycle cardboard boxes to reduce product packaging costs. When the cardboard box is recycled, the lid is opened and closed many times. Therefore, it is preferable to use a dedicated cardboard box lid fastener that can be easily opened and closed, and does not leave a sticky adhesive tape or adhesive. Regarding the lid fastener of the cardboard box, for example, the lid fastener shown in FIG. 1 of Patent Document 1 and the fastener shown in FIG.

FIG. 1 of JP-A-9-216620 FIG. 1 of JP2012-176768A

  However, in the lid fastening latch shown in FIG. 1 of Patent Document 1, the rear surface of the second plate portion is located on one side of the connecting plate portion 16. For this reason, as shown in FIG. 9A in the drawing of the property filed in the present application, when the front end portion of the inner lid faces slightly downward from the horizontal position, the lid stopper is tilted and the second plate portion Even if it is attempted to hang the inner lid at the front end and lift it up to the horizontal position, the rear surface hits the inner surface of the outer lid, so that it cannot reach the position where the front end of the second plate portion is hung on the inner lid. . When the cardboard box is repeatedly recycled, the bent portion of the inner lid gradually loses tension (becomes flexible), and when the inner lid is folded inward, it tends to face downward from the horizontal position.

  Also, as shown in FIG. 9B, when the tip of the inner lid is slightly inclined downward, the tip of the second plate and the tip of the inner lid are in contact with each other, There is a possibility that the outer lid and the inner lid cannot be inserted between the first plate portion and the second plate portion. Moreover, since the whole 1st board part is a flat thin plate shape without an unevenness | corrugation and there is no catch of the fingertip which performs the pushing operation of the arrow direction shown to the same FIG. 10 (b), this pushing operation is difficult. The same problem occurs when performing a pulling operation when removing the lid stopper.

The fastener shown in FIG. 1 of Patent Document 2 is formed of a linear member. Therefore, when the presser side (the part that presses the outer lid) is pushed with the fingertip and the receiving side (the part that presses the inner lid from below) is moved to the position where the back side of the inner lid is pressed, The receiving side easily tilts in the lateral direction due to the friction force generated therebetween.
In addition, when the tip portion of the portion that presses the inner lid from below and the tip portion of the inner lid are in contact with each other, the elongated connecting portion may be bent in the lateral direction.
Moreover, this fastener does not have a catch which makes pushing operation and pulling operation with a fingertip easy.

  The present invention has been proposed in order to solve the above-described problems, and temporarily closes the outer lid in the closed posture together with the inner lid so that the inner lid is inclined downward before the temporary fastening. An object of the present invention is to provide a lid cover for a cardboard box that can be placed in a horizontal position when it is in the posture, and can be easily pushed and pulled for attachment to the cardboard box.

The lid fastener of the cardboard box according to claim 1 includes an upper plate portion attached to the upper surfaces of the two outer lids in a closed posture of the cardboard box, and an inner lid presser portion attached to one lower surface of the inner lid, A connection plate portion that connects the upper plate portion and the inner lid presser portion with an upper and lower interval connecting the outer lid and the inner lid;
The inner lid pressing part is composed of a surface part including a wide top part,
The connecting plate portion stands up from a rear portion of a central portion that substantially bisects the lower surface of the upper plate portion, and further extends forward of the upper plate portion to leave the upper plate portion. Having a length to support the inner lid presser portion at the position,
The upper plate part is provided with an operation part for facilitating a moving operation in the front-rear direction along the abutting tip part of the outer lid by a fingertip.

  The lid fastener of the corrugated cardboard box according to the present invention maintains the state in which the pair of inner lids and the pair of outer lids of the corrugated cardboard box are folded in an inward substantially horizontal posture, and the inner lid and the inner lid are inadvertently folded. Since only the two outer lids used to keep the lids open are slightly lifted, the two outer lids must be fastened together with one of the inner lids.

  Many types of cardboard boxes are provided with two pairs of inner lids and two pairs of outer lids in a state of extending from the upper ends of the four side walls. The inner lid and the outer lid are orthogonal to each other in plan view. When closing this type of cardboard box, first, the two inner lids are bent to a horizontal posture, and then the two outer lids are bent to be in a horizontal posture. In this way, the outer lid is positioned so as to overlap the inner lid. When the pair of outer lids in the closed posture are closed, the tip portions of the two outer lids are in contact with each other. On the other hand, there is a large gap between the tip portions of the pair of inner lids oriented in the horizontal posture. The lid fastener of the cardboard box according to the present invention is used for a cardboard box having such an upper lid structure.

In the use of the lid clasp of the cardboard box according to the present invention, immediately before the outer lid is closed, the lower part including the connecting plate portion in the gap between the front edge portions on the side where the pair of outer lids abut each other. The first work is to insert the part from above. Thereafter, the outer lid is completely closed.
Then, the upper plate portion of the lid fastener is pressed against the upper surface portion along the butted end portions of the two outer lids from above, and the connecting plate portion enters the cardboard box between the butted end portions of the two outer lids. The inner lid pressing portion is made to enter the box through a large gap between the tip portions of the pair of inner lids in a horizontal posture.
Then, the upper lid part is slid in the same direction by pressing the upper plate part with a fingertip in a direction in which the inner lid pressing part is in contact with the lower surface of the front inner lid pressing part. What is necessary is just to make it the state penetrated deeply in the direction along the lower surface of the inner cover of a sheet | seat.
If it does in this way, it will be in the state where two outer lids and one inner lid were pinched by the upper board part and the inner lid presser part. For this reason, the outer lid and the inner lid are kept closed.

The connection plate part is configured to place the inner lid presser part at a position farther forward than the upper plate part. Since the inner lid pressing portion has a surface portion including a top portion having a width in a direction orthogonal to the longitudinal direction of the connecting plate portion in plan view, the inner lid pressing portion is pressed without damaging the back surface of the inner lid.

The lid fastener of the corrugated cardboard box according to claim 2 is further formed by a gently inclined surface in which the peripheral surface of the upper surface of the upper plate portion is increased from the peripheral portion toward the inside, and is surrounded by the inclined surface. A wide surface is formed by a high flat surface,
The operation unit is configured by an operation unit for pushing operation formed by a rear surface of the inclined surface and an operation unit for pulling operation formed by a front surface of the inclined surface.
The

  If there is an inclined surface for pushing operation and an inclined surface for pulling operation on the upper plate part, the pushing operation in the direction to sandwich the lid fastener between the outer lid and the inner lid, and the pulling operation in the direction to release this clamping Becomes easier.

  The thicker the upper plate is, the stronger the plate is. However, when the upper plate is thicker, when the work is done by sliding the cardboard box over the cardboard box with the lid attached, There is a possibility that the outer lid may be torn by catching the tool, the bottom of the corrugated cardboard boxes to be stacked may be damaged, the direction of the lid fastener may be inclined, or the lid fastener may fall off. In an operation of loading a cardboard box containing products on a pallet or a truck bed, speed is often required, and the cardboard boxes are often slid and stacked.

  In the case of the lid fastener according to the present invention, the upper plate portion has a strong plate thickness, and the peripheral surface of the upper plate portion is a gently inclined surface. The stacked cardboard boxes get over the upper plate portion along the inclined surface without being caught by the upper plate portion.

  The lid fastener of the cardboard box according to claim 3 is the lid fastener of the cardboard box according to claim 1 or 2, and further, the connecting plate portion is inclined in the front-rear direction slightly upward as it goes forward. It is comprised by a long narrow board part and the reinforcement rib provided in the location along the lower surface of this narrow board part.

  Corrugated cardboard boxes are classified into three-layer corrugated cardboard and five-layer corrugated cardboard. Many cardboard boxes of general-purpose products are made of corrugated paper having a three-layer structure, but many are made of corrugated paper having a five-layer structure.

  The lid fastener according to claim 3 can correspond to both an upper lid made of corrugated paper having a three-layer structure and an upper lid made of corrugated paper having a five-layer structure. That is, the vertical distance between the lower surface of the upper plate portion and the upper end of the inner lid pressing portion is substantially matched to the thickness of the outer lid and the inner lid made of corrugated paper having a three-layer structure.

  If the outer lid and inner lid made of corrugated paper with a five-layer structure are overlapped and inserted between the upper plate and inner lid retainer, this insertion will include the inner lid retainer. The intermediate length surface of the narrow plate portion and the reinforcing rib are deformed by being pushed downward to enable the insertion. This deformation depends on the natural resilience of the plastic.

  The lid fastener for a cardboard box according to claim 4 is the lid fastener for a cardboard box according to any one of claims 1 to 3, and is further directed obliquely downward in front of the inner lid retainer. An inclined surface is provided, and a push-up surface is provided in front of the inclined surface so as to hang up and push the tip of the inner lid facing downward.

  Corrugated cardboard boxes that have been recycled are often softened by losing the tension of the bent part of the upper lid, and when the inner lid is folded inward, the tip of the inner lid often faces downward from the horizontal position. . The lid fastener according to claim 4 can cope with such a case.

  That is, when the tip of the inner lid is slightly below the horizontal posture, the inclined surface provided in front of the inner lid retainer presses the tip of the inner lid, and the tip of the inner lid It was made to slide up to become a horizontal posture along this inclined surface.

  If the front end of the inner lid is greatly downward, tilt the front part of the lid fastener downward and hang the front end of the inner lid on the push-up surface of the front end of the lid fastener. Raise the tip of to the horizontal position.

According to the lid fastener of the cardboard box concerning the present invention, the following effects are produced.
A central part where the upper plate part and the inner lid presser part are connected by a connecting part made of an upright plate member, the entire lid fastener is made into a plate shape, and the connection part and the inner lid presser part are substantially bisected at the lower surface of the upper plate part As a result of being positioned in front of the outer lid, the movement in the linear direction along the tip of the outer lid can be performed in a correct posture, so that the outer lid can be temporarily fastened together with one of the inner lids. Became.

  In addition, as a result of making the surface near the periphery of the upper surface of the upper plate a gentle inclined surface that gradually increases from the periphery toward the inside, the inner surface surrounded by the inclined surface is a wide, high-level flat surface. Even when the cardboard box is slid and stacked on the cardboard box with the lid attached, the lid clasp is caught and damaged, the outer lid is torn, the lid clasp is tilted, the lid clasp is There will be no situation of falling out.

  In addition, as a result of providing an operation part for the operation with the fingertip on the upper surface of the upper plate part, it is now possible to easily perform the pushing operation in the fastening direction of the lid fastener and the operation in the pulling direction to release this fastening. .

  In addition, as a result of the curved surface shape having the top surface of the inner lid presser portion as the top, even if the inner lid is in a direction in which the distal end portion of the presser portion and the distal end portion of the inner lid face each other, the distal end portion of the inner lid is It can be pushed up to the horizontal position, which is the fastening position, along the curved surface.

  In addition, as a result of providing an inclined surface directed obliquely downward in front of the inner lid retainer, even if the distal end portion of the inner lid faces slightly below the horizontal position, the distal end portion of the inner lid is It can be pushed up to the horizontal position.

  In addition, as a result of providing a push-up surface that is pushed forward by hooking the tip of the inner lid facing downward, the push-up surface is moved forward even when the tip of the inner lid is greatly downward. The tip of the inner lid can be pushed up to a horizontal position by raising it upward.

(A) is a perspective view of the cardboard box in a state where the upper lid is raised, (b) is a perspective view of the cardboard box in a state where the upper lid is bent outward. (A) is the perspective view which looked at the lid fastener of the cardboard box concerning the present invention from diagonally upward, (b) is the perspective view which looked from diagonally downward, (c) is the same top view, (d) is also the front Figure. (A) is the perspective view which showed the first process in the usage method of the cover fastener of a cardboard box, (b) is the front part expanded sectional view similarly. (A) is the perspective view which showed the intermediate | middle process in the usage method of the cover fastener of a cardboard box, (b) is the front part expanded sectional view similarly. (A) is the perspective view which showed the last process in the usage method of the cover fastener of a cardboard box, (b) is the front partial expanded sectional view similarly. (A) is the front partial expanded sectional view which showed one of the intermediate processes in the usage method of the cover fastener of a cardboard box, (b) is the front partial expanded sectional view which showed another one of the intermediate processes similarly. (A) is the perspective view which showed the method to cancel | release the closed state of the outer cover and inner cover by the cover fastener of a cardboard box, (b) is the front part expanded sectional view similarly. (A) is the perspective view which looked at the lid fastener of the cardboard box which concerns on 2nd Embodiment of this invention from diagonally downward, (b) is the perspective view which also saw from diagonally upward. (A) (b) (c) is the front partial expanded sectional view which showed the malfunction which all have the lid fastener of a prior art.

  The mode for carrying out the invention will be more clearly understood from the following examples.

[Cardboard box]
FIG. 1 (a) shows a cardboard box 20 with an upper lid opened.
A cardboard box 20 having a rectangular shape in a plan view shown in FIG. 1 is used in many cases for packaging such as distribution and storage of goods. As in many types of cardboard boxes, the cardboard box 20 has two pairs of outer lids 22A and 22B and two pairs of inner lids 24A and 24B on the upper ends of the four side plates 21A to 21D, respectively. It can be opened and closed freely.

  In the case of an unused cardboard box 20, as shown in FIG. 1 (a), the outer lids 22A and 22B and the inner lids 24A and 24B that are erected upward are placed in an inward horizontal posture after finishing the packaging of the product. Is folded in the closing direction. In the case of a rectangular cardboard box 20 in plan view, the outer lids 22A and 22B are closed with the front end portions 22a and 22a abutting each other. The inner lids 24A and 24B are closed with a large space between the tip portions 24a and 24a. When boxing by hand, the outer lids 22A and 22B and the inner lids 24A and 24B may be bent outward as shown in FIG. Further, when the cardboard box 20 is recycled, the number of times the outer lids 22A and 22B and the inner lids 24A and 24B are bent increases. For this reason, the bent parts 23, 23, 25, 25 gradually lose tension and become soft.

  For the cardboard box 20 according to the present invention, the outer lids 22A and 22B close the front end portions 22a and 22a, and the inner lids 24A and 24B close with a space between the front end portions 24a and 24a. It is a lid closure. The lid fastener is temporarily locked by sandwiching two pairs of outer lids 22A and 22B and one of the inner lids 24A and 24B so that the closed outer lids 22A and 22B do not open. Fasten.

[Copper of First Embodiment]
FIGS. 2A to 2D show a lid fastener (hereinafter abbreviated as lid fastener) 1 of a cardboard box according to the first embodiment of the present invention.
The lid fastener 1 is attached to the upper plate portion 2 attached to the upper surfaces of the pair of outer covers in the closed state of the cardboard box and the lower surface of one of the pair of inner lids in the closed state. The inner lid retainer 4, the upper plate 2, and the inner lid retainer 4 are provided with a vertical distance D that substantially matches the thickness of the outer lid and the inner lid of the cardboard box. It is an integrally formed product made of plastic having a connecting plate part 3 connected at a position away from the front. The vertical distance D is approximately matched to the dimension obtained by superposing the outer lid and the inner lid made of corrugated paper having a three-layer structure.

  The upper plate portion 2 has a substantially rectangular shape having a slightly longer lateral width W than a longitudinal length L indicated by an arrow (A) in plan view. A frame-shaped peripheral peripheral surface 2a from the peripheral portion of the upper plate portion 2 toward the inner side of the upper surface is formed by a gently inclined surface that increases toward the inner side. The rear surface of the peripheral edge surface 2a is a rear operation section 2b that performs a pressing operation with a fingertip, and the front surface of the peripheral surface 2a is a front operation section that performs a pull operation with a fingertip. 2c. The words “push operation” and “pull operation” are merely examples because the operation direction differs depending on the position at which the lid fastener 1 is operated. The inner side surface surrounded by the peripheral edge surface 2a has a wide flat high level surface 2d.

  The inner lid pressing portion 4c is configured by the top surface of the narrow plate portion 4 that is long in the vertical direction. The narrow plate portion 4 has an arc-shaped rear surface 4a with the rear end facing rearward and downward, a mid-length surface 4b inclined upward toward the front, and an inner lid presser portion 4c having a mountain-shaped ridgeline The curved surface is formed by connecting an inclined surface 4d inclined forward and downward and a push-up surface 4e inclined upward. The front end 4f of the push-up surface 4e is bent downward. A reinforcing rib 5 is integrally formed at a central portion along the length direction of the lower surface of the narrow plate portion 4.

  The connection plate portion 3 has a shape that rises downward from the rear portion of the central portion that substantially bisects the lower surface of the upper plate portion 2 and further extends to a position below the front end of the upper plate portion 2. The front end portion of the connecting plate portion 3 is connected to the upper central portion of the rear surface 4a of the narrow plate portion 4, and the inner lid pressing portion 4c is disposed at a position away from the front end of the upper plate portion 2. .

The attachment method of the lid fastener 1 is shown by FIGS.
As shown in FIGS. 3A and 3B, the lid fastener 1 is attached before the inner lids 24A and 24B and the outer lids 22A and 22B of the cardboard box 20 are closed. Is started and the front portion of the upper plate portion 2 is plunged into the inner side of the cardboard box 20 from the gap S between the front end portions 22a and 22a of the outer lids 22A and 22B.

Subsequently, as shown in FIGS. 4 (a) and 4 (b), the outer lids 22A and 22B are connected to each other with the connecting plate portion 3 of the lid fastener 1 sandwiched between the tip portions 22a and 22a of the outer lids 22A and 22B. The tip portions 22a, 22a are butted and closed.
Thereafter, the lower surface of the upper plate portion 2 of the lid fastener 1 is placed along the upper surfaces of the outer lids 22A and 22B, the fingertip is attached to the operation portion 2b on the rear side of the upper plate portion 2, and the upper plate portion 2 is included. Push the entire lid closure 1 forward as indicated by the arrow.
By this pushing operation, the inner lid 24A is inserted between the lower surfaces of the outer lids 22A and 22B and the inner lid pressing portion 4c, and the outer lids 22A and 22B and the inner lids 24A and 24B are kept closed.

Thereafter, as shown in FIGS. 5 (a) and 5 (b), when the lid fastener 1 is advanced until the rear portion of the connecting plate portion 3 comes into contact with the front end portion 24a of the inner lid 24A, the outer lids 22A, 22B and The inner lid 24A is inserted deeply between the lower surface of the upper plate portion 2 and the upper surface of the inner lid pressing portion 4c and is held between the inner lid 24A and the inner lids 24A and 24B. It will be closed and the lid fastener 1 will not be removed carelessly.
The lid fastener 1 securely fastened to the upper part of the cardboard box 20 does not come off unless it is moved by the pulling operation in the direction opposite to the pushing direction described above.

  When the lid fastener 1 is attached, when the tip 24a of the inner lid 24A is inclined slightly downward as shown in FIG. 6A, the front of the inner lid retainer 4c in accordance with the pushing operation described above is provided. The inclined surface 4d pushes the distal end portion 24a of the inner lid 24A, and pushes the distal end portion 24a up to the horizontal position along the inclined surface 4d.

  As shown in FIG. 6B, even when the front end 24a of the inner lid 24A is greatly downward, it is positioned at the front end of the narrow plate portion 4 when the front of the lid fastener 1 is greatly inclined downward. When the push-up surface 4e to be delivered reaches a position below the tip 4a of the inner lid 4, the tip 4a of the inner lid 4 is hung by the push-up surface 4e, the push-up surface 4e is raised upward, and the tip of the inner lid 24A The portion 24a can be pushed up to the horizontal position. Whether or not the inner lid pressing portion 4e is in contact with the back surface of the inner lid 24A can be determined by the feeling of the hand operating the lid fastener 1. When the inner lid pressing portion 4e reaches the back surface of the inner lid 24A, the movement of the lid fastener 1 in the pushing direction becomes stiff.

When removing the lid fastener 1 attached to the cardboard box 20, the fingertip is pressed against the operation portion 2c on the front side of the upper plate portion 2, and the lid fastener 1 is pulled in the direction indicated by the arrow, The pressing portion 4e is moved to a position where it is disengaged from the distal end portion 24a of the inner lid 24A.
In this way, the upper plate portion 2 of the lid fastener 1 can be easily removed with the fingertips, and the outer lids 22A and 22B can be opened. Even if the operation is performed by manually opening the outer lids 22A and 22B by placing the fingertips on the front and rear edges of the outer lids 22A and 22B with the lid fastener 1 attached, the outer lids 22A and 22B are easily opened. The lid fastener 1 is detached from the outer lids 22A and 22B.

[Copper of Second Embodiment]
7 (a) and 7 (b) show a lid fastener (hereinafter simply referred to as lid fastener) 10 for a cardboard box according to a second embodiment of the present invention.
The lid fastener 10 is an integrally molded product made of plastic having a structure capable of raising the operation portion 11 from the upper plate portion 2. Since the other part is the same as that of the lid fastener 1 according to the first embodiment shown in FIG. 2, the same reference numerals as those of the lid fastener 1 are used and redundant description is omitted.
The upper plate portion 2 of the lid fastener 10 is formed with a notch portion 2g in which one side portion is greatly cut out in a U-shape, and the notch portion 2g on the substantially central side of the upper plate portion 2 has a notch An operation unit 11 is connected in accordance with the size of the unit 2g. The connection part of the operation part 11 is comprised by the bending part of 2 m thin-walled structure, For this reason, the operation part 11 is one-side-supported so that opening and closing is possible in the direction settled in the notch part 2g from the standing upright posture.
The operation unit 11 moves the lid fastener 10 when the outer lid and the inner lid of the cardboard box are inserted into the vertical gap between the upper lid portion 2 of the lid fastener 10 and the inner lid retaining portion 4e. It becomes the part that is pinched with the fingertips.

  After the lid fastener 10 is attached to the cardboard box and closed so that the outer lid does not open, the operation unit 11 is tilted and stored in the notch 2g. On the rear edge 2j of the notch 2g, an engaging portion 2h notched in an L shape is formed so that the protrusion 11a provided on the rear edge of the operation portion 11 is inserted and engaged. Has been. An engaging portion 2k cut into an L shape that engages with a protrusion 11b provided on the front edge of the operating portion 11 at the front edge 2n of the notch 2g. Is formed.

  When the operation part 11 is laid down and stored in the notch 2g, the protrusion 11a on the rear side of the operation part 11 is engaged in the notch 2g engagement part 2h, and the protrusion 11b on the front side of the operation part 11 is engaged. Engages in the notch 2g engaging portion 2k. When the operation unit 11 is accommodated in the notch 2g, the upper surface of the operation unit 11 is substantially aligned with the upper surface of the upper plate unit 2, and the lower surface of the operation unit 11 is aligned with the lower surface of the upper plate unit 2. . That is, the operation unit 11 becomes a flat state in which the upper plate unit 2 is integrated.

  The lid fastener of the corrugated cardboard box according to the present invention can be used in all fields from the production of small products, distribution, storage, and sales, which may use the corrugated cardboard box.

DESCRIPTION OF SYMBOLS 1 (Corrugated cardboard box according to the first embodiment of the present invention) Lid 2 Upper plate portion 2a Periphery near surface 2b Operation portion 2c Operation portion 2d High surface 3 Connection plate portion 4 Narrow plate portion 4a Rear surface 4b Intermediate length Surface 4c Inner lid pressing portion 4d Inclined surface 4e Push-up surface 5 Reinforcing rib 6 Locking portion 7 Standing plate portion 8 Folding plate portion 10 (in the cardboard box according to the second embodiment of the present invention) Lid stopper 11 Operation portion 20 Cardboard boxes 22A, 22B Outer lid 22a Tip 24A, 24B Inner lid 24a Tip

Claims (4)

The upper plate portion attached to the upper surfaces of the two outer lids in the closed position of the cardboard box, the inner lid presser portion attached to the lower surface of one inner lid, the upper plate portion and the inner lid presser portion A connection plate portion that connects the outer lid and the inner lid with an upper and lower interval that overlap each other; and
The inner lid pressing part is composed of a surface part including a wide top part,
The connecting plate portion stands up from a rear portion of a central portion that substantially bisects the lower surface of the upper plate portion, and further extends forward of the upper plate portion to leave the upper plate portion. Having a length to support the inner lid presser portion at the position,
The upper plate part is provided with an operation part for facilitating a moving operation in the front-rear direction along the front end part of the outer cover by the fingertip. The surface near the periphery of the upper surface of the upper plate portion is formed with a gently inclined surface that increases from the periphery toward the inside, and a wide surface surrounded by the inclined surface is formed with a high level flat surface,
The cardboard according to claim 1, wherein the operation unit is configured by an operation unit for pushing operation including a rear surface of the inclined surface and an operation unit for pulling operation including a front surface of the inclined surface. Box lid fastener.   The connecting plate portion is constituted by a narrow plate portion that is long in the front-rear direction inclined slightly upward as it goes forward, and a reinforcing rib provided at a location along the lower surface of the narrow plate portion. Item 3. A cardboard box lid fastener according to Item 1 or 2.   2. An inclined surface directed obliquely downward is provided in front of the inner lid pressing portion, and a push-up surface is provided in front of the inner lid pressing portion that is pushed up by hanging the tip of the inner lid facing downward. The lid fastener for the cardboard box according to any one of items 1 to 3.

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