JP2009083870A - Sheet material locking mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet material locking mechanism capable of reliably locking an end part of a sheet material, and reducing the man-hour during the assembling and disassembling operations. <P>SOLUTION: When assembling a corrugated fiberboard spacer 1, a second supporting surface 4b of a supporting part 4 is folded at a right angle along folding lines L9 and L10. The supporting part 4 is turned to a bottom surface part 3 side along a folding line L2, and the second supporting surface 4b is inserted from a lower end part into slits 7a and 7b. In this condition, a flap 17 of the second supporting surface 4b is folded along a folding line L11 by a finger inwardly (the direction of an arrow Y) by about 180°, and inserted in engagement holes 9a and 9b in this condition. When releasing the finger holding the flap 17 after the flap 17 is passed through the engagement holes 9a and 9b, the flap 17 is turned by the restoration force close to a substantially horizontal point, and engaged with opening edges of the engagement holes 9a and 9b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lock mechanism for detachably connecting a sheet material such as a cardboard sheet.

  Conventionally, packing materials such as packaging containers made of corrugated cardboard sheets and spacers for packing, which are inexpensive, have high strength, are recyclable and excellent in workability, have been widely used. Such a packaging material made of a corrugated cardboard sheet is formed by folding a corrugated cardboard sheet into a predetermined shape. However, in order to maintain the shape of the folded packaging material, it is necessary to fix the end portion.

However, when a fixing member such as an adhesive tape is used, the fixing operation becomes complicated and there is a problem that the cost is increased by the amount of the fixing member. Therefore, a method of easily locking the end portion of the cardboard has been proposed. For example, in Patent Document 1, an insertion piece is provided at one end of an openable / closable lid portion, and a locking piece provided on the main body side is inserted. A packaging box is disclosed in which a lid is locked by being inserted into a slit formed in a piece.
JP-A-7-1112737

  However, in the method of Patent Document 1, it is necessary to sequentially insert the insertion piece and the locking piece when fixing the end portion of the cardboard, and two steps of removal are also required when disassembling the packaging box. For this reason, man-hours during assembly work and disassembly work are increased, and workability is deteriorated.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a sheet material locking mechanism that reliably locks the end of a sheet material and that requires less man-hours during assembly and disassembly operations.

  In order to achieve the above object, the present invention provides a sheet material locking mechanism that detachably connects a first sheet material and a second sheet material inserted into a slit formed in the first sheet material. The second sheet material is provided with a foldable flap, and the first sheet material is integrally formed with an engagement hole for engaging the flap along the longitudinal direction of the slit. The flap is rotated by a restoring force and engaged with the opening edge of the engagement hole by releasing the pressing force after passing through the engagement hole in a bent state by applying a pressing force. It is characterized by.

  Further, in the sheet material locking mechanism according to the present invention, the flap is formed in a substantially triangular shape having an insertion direction as a vertex at a corner of the insertion side upper end of the second sheet material. The hole is formed in a substantially wedge shape with the upper end of the slit as an apex.

  According to the present invention, in the sheet material locking mechanism configured as described above, an opening for releasing the engagement between the flap and the engagement hole is provided in the sheet molded product including the first sheet material. It is characterized by.

  According to the first configuration of the present invention, the foldable flap provided in a part of the second sheet material is rotated by the restoring force and engages with the opening edge of the engagement hole. Thus, the first sheet material and the second sheet material can be simply connected and the connection can be released simply by passing the engagement hole.

  According to the second configuration of the present invention, in the sheet material locking mechanism of the first configuration, the flap is formed in a substantially triangular shape with the insertion direction as the apex at the corner of the upper end of the second sheet material on the insertion side. By forming the engagement hole in a substantially wedge shape with the upper end of the slit as the apex, the engagement and release operation between the flap and the engagement hole becomes easier.

  According to the third configuration of the present invention, in the sheet material locking mechanism according to the first or second configuration, the opening for releasing the engagement between the flap and the engagement hole is formed in the sheet molded product. By providing, workability | operativity at the time of decomposition | disassembly and disposal of a sheet molded article improves further.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a development view of a cardboard spacer provided with a locking mechanism of the present invention. In FIG. 1, the cut-out portion is indicated by hatching, the cut is indicated by a solid line, and the fold line (valley fold line) is indicated by a broken line. The corrugated cardboard spacer 1 is disposed in a gap between the packaging container and the product (packaged object), thereby restricting the movement of the product in the container and protecting it from damage or damage due to impact or vibration. The corrugated cardboard spacer 1 of the present invention is formed by assembling a single sheet material punched into a predetermined shape as shown in FIG. 1, and is roughly continuous via parallel folding lines L1 and L2. It is comprised from the side part 2, the bottom face part 3, and the support part 4. As shown in FIG.

  The side surface portion 2 is divided into a first side surface 2a, a second side surface 2b, a third side surface 2c, and a fourth side surface 2d that are continuous via fold lines L3 to L5 parallel to the fold lines L1 and L2. A U-shaped cut S1 is formed on the side surface 2a, and an insertion piece 5a is formed on the tip of the fourth side surface 2d. Further, two slits 7a and 7b perpendicular to the fold lines L4 and L5 are formed from the fold line L5 to the middle of the second side surface 2b, and the ends of the slits 7a and 7b on the second side surface 2b side are formed. In the portion, substantially wedge-shaped engagement holes 9a and 9b are formed symmetrically.

  The ends of the slits 7a and 7b on the fold line L5 side are connected by a cut S2, and a portion surrounded by the slits 7a and 7b and the cut S2 is an inward bent portion 11. The inner bending portion 11 can be bent independently by two folding lines L6 and L7 parallel to the folding lines L3 to L5, and an insertion piece 5b is formed at the tip. A substantially U-shaped cut S3 is formed in the center of the fold line L6.

  A substantially trapezoidal insertion piece 5c surrounded by a substantially U-shaped cut S4 and a folding line L8 is formed at a substantially central portion of the bottom surface portion 3. Openings 13 a, 13 b, 13 c, and 13 d are formed at predetermined positions on the side surface portion 2 and the bottom surface portion 3. The opening 13a formed across the first side surface 2a and the bottom surface portion 3 is a relief hole for avoiding interference with the convex portion of the product that is the package object, and the first side surface 2a and the second side surface. The opening 13b formed over 2b is a hole into which a finger is inserted when releasing a lock mechanism (described later) of the assembled cardboard spacer 1, and also serves as a gripping portion of the cardboard spacer 1.

  A triangular opening 13c formed in the second side surface 2b is a direction indication mark for confirming the arrangement direction of the cardboard spacer 1. An opening 13d formed at the center of the inner bending portion 11 is an insertion hole into which the insertion piece 5c of the bottom surface portion 3 is inserted, and is formed according to the shape of the insertion piece 5c. A U-shaped cutout 15a is formed on the fourth side surface 2d, and the opening portion 13a is not sealed when the side surface portion 2 is bent into a rectangular tube shape along the folding lines L1 and L3 to L5. ing.

  The support portion 4 includes a first support surface 4a continuous to the bottom surface portion 3 via a fold line L2, and a second support surface 4b continuous to the left and right of the connecting surface 4a via fold lines L9 and L10. A semicircular cutout 15b is formed in the support surface 4a. A substantially triangular flap 17 surrounded by a fold line L11 and a cut S5 is formed at the outer corner of the second support surface 4b.

  Next, the assembly procedure of the cardboard spacer 1 of the present invention will be described. First, the side surface portion 2 is bent into a square tube shape along the folding lines L1 and L3 to L5 from the state of FIG. 1, and the fourth side surface 2d is overlapped on the bottom surface portion 3. At this time, the inner side of the cut S1 is cut and raised by bending the folding line L1, and the insertion hole 19 (see FIG. 3) is formed. Then, the insertion piece 5a on the fourth side surface 2d is inserted into the insertion hole 19 and fixed.

  Next, after bending the inner bending portion 11 along the folding lines L6 and L7, the insertion piece 5b is inserted into the insertion hole 19 and fixed. Furthermore, the insertion piece 5c of the bottom surface portion 3 is raised along the fold line L8, and is inserted into the opening 13d formed in the inner bending portion 11 and fixed. Thereby, as shown in FIG. 3, the center part (inner bending part 11) of the side part 2 is bent in a cross-sectional rectangular shape, and both ends are bent in a cross-section inverted trapezoidal shape.

  Next, as shown in FIGS. 4 and 5, the second support surface 4b of the support portion 4 is bent at a right angle along the fold lines L9 and L10. And the support part 4 is rotated to the bottom face part 3 side (arrow X direction of FIG. 5) along the fold line L2, and as shown in FIG. 6, the 2nd support surface 4b is made into slit 7a, 7b from a lower end part. Insert it.

  At this time, as shown in FIG. 7 (a), the flap 17 of the second support surface 4b is bent approximately 180 ° inward (in the direction of arrow Y in FIG. 6) with a finger along the fold line L11 (see FIG. 5). In this state, it is inserted into the engagement holes 9a and 9b. Then, when the finger holding the flap 17 is released after the flap 17 has passed through the engagement holes 9a and 9b, the flap 17 is rotated to near horizontal by a restoring force as shown in FIG. 7B. Engages with the opening edges of the joint holes 9a, 9b.

  That is, the engagement holes 9a and 9b and the flap 17 constitute a lock mechanism for the support portion 4, and the first support surface 4a and the second support surface 4b are bent in a U shape by the lock mechanism. Since the side portion 2 is securely locked, the support portion 4 can maintain the shape of the side portion 2. 6 and 7 show only the configuration on the side of the engaging hole 9b, the same applies to the side of the engaging hole 9a.

  The shape and arrangement of the engagement holes 9a and 9b and the flap 17 are not particularly limited as long as they can reliably engage the second support surface 4b and the side surface portion 2, but from the viewpoint of assembly workability, It is preferable to provide the flap 17 at the corner of the upper end on the insertion side of the second support surface 4 that can be easily bent with a finger. In addition, in order to allow the flap 17 to pass through the engagement holes 9a and 9b without being greatly bent and to securely engage the flap 17 and the edge of the engagement holes 9a and 9b after the passage, as in the above embodiment. The flaps 17 are preferably formed in a substantially triangular shape with the insertion direction as a vertex, and the engagement holes 9a and 9b are preferably formed in a substantially wedge shape with the upper ends of the slits 7a and 7b as a vertex.

  FIG. 8 is a plan view of the assembled cardboard spacer 1, and FIG. 9 is a side view seen from the left direction of FIG. As shown in FIG. 8, the space surrounded by the first support surface 4 a, the second support surface 4 b, and the inner bending portion 11 serves as a storage portion 20 that stores accessories and the like. Further, the inner side of the cut S3 is cut and raised by bending the fold line L6 to form the protruding portion 21. The protruding portion 21 functions as a stopper that restricts movement of accessories and the like stored in the storage portion 20. Since the semicircular cutout 15b is formed at the upper end portion of the first support surface 4a, accessories and the like in the storage portion 20 can be easily taken out.

  Further, as shown in FIG. 9, the end surface of the third side surface 2c is disposed at a position that divides the storage portion side surface 20a (hatched portion in FIG. 9) into approximately two equal portions. As a result, even when a heavy article is stored in the storage unit 20 and dropped with the storage unit side surface 20a facing down, the third side surface 2c can serve as a reinforcing member to prevent the storage unit side surface 20a from being crushed. .

  FIG. 10 is an enlarged perspective view of the vicinity of the opening 13b of the cardboard spacer 1. When the cardboard spacer 1 is disassembled or discarded, a finger is inserted through the opening 13b and the flap 17 is pushed downward (in the direction of the arrow in FIG. 10), and in this state, the engagement holes 9a and 9b are passed through the second support surface. By pulling out 4b from the slits 7a and 7b, the engagement between the engagement holes 9a and 9b and the flap 17 can be easily released. In FIG. 10, only the configuration on the engagement hole 9b side is shown, but the same applies to the engagement hole 9a side.

  In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, although the cardboard spacer provided with the lock mechanism of the present invention is illustrated in the above embodiment, other lock mechanisms such as a cardboard case formed from a cardboard sheet may be used. Moreover, as long as it is a sheet | seat material which has the resilience like a corrugated cardboard sheet | seat, it can apply also to another material.

  The present invention is used when detachably connecting a first sheet material and a second sheet material inserted into a slit formed in the first sheet material, and the second sheet material can be folded. The first sheet material is integrally formed with an engagement hole with which the flap engages along the longitudinal direction of the slit, and the engagement hole is passed through in a state where the flap is bent by applying a pressing force to the flap. After that, by releasing the pressing force, the flap is rotated by the restoring force, and the sheet material locking mechanism is engaged with the opening edge of the engagement hole.

  Accordingly, the first sheet material and the second sheet material can be simply connected by simply pressing the flap and passing through the engagement hole, and the connection can be released. It can be used as a fixing method excellent in assembly and disassembly workability of a molded product.

  Furthermore, the flap is formed in a substantially triangular shape with the insertion direction as the apex at the corner of the insertion side upper end of the second sheet material, the engagement hole is formed in a substantially wedge shape with the upper end of the slit as the apex, Since the opening for releasing the engagement with the engagement hole is provided, the workability at the time of disassembling and discarding the sheet molded product is further improved.

These are the expanded views of the cardboard spacer provided with the locking mechanism of the present invention. These are top views which show the state which bent the side part 2 from the state of FIG. 1 in the shape of a square cylinder. These are the side views seen from the left direction of FIG. These are top views which show the state which bent the 2nd support surface 4b substantially perpendicularly from the state of FIG. These are the side views seen from the left direction of FIG. These are the fragmentary perspective views which show a mode that the 2nd support surface 4b is inserted in the slit 7b. These are enlarged views which show the relationship between the flap 17 and the engagement hole 9b. These are top views which show the state which assembled the cardboard spacer. FIG. 9 is a side view of the corrugated cardboard spacer as viewed from the left in FIG. 8. These are the expansion perspective views of the opening part 13b periphery of a cardboard spacer.

Explanation of symbols

1 Corrugated cardboard spacer 2 Side surface (first sheet material)
2a 1st side surface 2b 2nd side surface 2c 3rd side surface 2d 4th side surface 3 bottom face part 4 support part 4a 1st support surface 4b 2nd support surface (2nd sheet material)
5a-5c Insertion piece 7a, 7b Slit 9a, 9b Engagement hole (lock mechanism)
11 Inner bending parts 13a-13d Opening part 17 Flap (lock mechanism)
19 Insertion hole 20 Storage part 20a Storage part side surface 21 Projection part

Claims (3)

A sheet material locking mechanism that removably couples a first sheet material and a second sheet material inserted into a slit formed in the first sheet material,
The second sheet material is provided with a foldable flap, and the first sheet material is integrally formed with an engagement hole for engaging the flap along the longitudinal direction of the slit,
After applying the pressing force to the flap and passing through the engagement hole in a bent state, releasing the pressing force causes the flap to rotate by a restoring force and engage with the opening edge of the engagement hole. A sheet material locking mechanism characterized by combining.   The flap is formed in a substantially triangular shape with the insertion direction as a vertex at the corner of the insertion side upper end of the second sheet material, and the engagement hole has a substantially wedge shape with the upper end of the slit as a vertex. The sheet material locking mechanism according to claim 1, wherein the sheet material locking mechanism is formed.   The sheet molded article including the first sheet material is provided with an opening for releasing the engagement between the flap and the engagement hole. Material locking mechanism.

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