JP7448187B2 - Binding tool and joining method using the same - Google Patents

Description

The present invention relates to a connector for connecting overlapping parts where cardboards overlap each other when assembling a packaging member using cardboards having a core that forms a hollow space between a plurality of liners made of cardboard or plastic, and a connector for connecting the same. Regarding the bonding method used.

Generally, when assembling a box-shaped packaging member from cardboard, a stitching machine (stitcher) is used to join the overlapping parts where the cardboard boxes overlap each other.

However, since the stitching machine used for assembling cardboard boxes is a large, special device, packaging members can only be assembled from cardboard boxes at a specific location equipped with a stitching machine.

Therefore, it was necessary to assemble the packaging member at a location equipped with a stitching machine and then deliver the packaging member to the product packaging location.

Therefore, when assembling packaging members using a stitching machine, it takes a lot of effort, and it is also necessary to secure a storage space when storing the packaging members assembled in a box shape at a packaging site. Moreover, if the packaging members are assembled at the storage location, the packaging members will become bulky when being transported from the storage location to the site where they will be packed, and transportation efficiency will be greatly reduced.

From this point of view, conventionally, when assembling a packaging member from cardboard, a through hole passing through in the front and back direction is opened in the overlapping part where the cardboards are overlapped, and a positioning flange is installed at the base end from one side of the overlapping part in the front and back direction. A female fastener that protrudes and has a female thread on the inside of the shaft is inserted, while a positioning flange protrudes from one side in the front and back direction of the overlapping part to the base end and has a male thread on the outside of the shaft. There is a known method in which the male fastener is inserted and the male thread of the male fastener is screwed into the female thread of the female fastener until the overlapping part is pressed from both sides in the front and back directions by the flanges of the other. (See Patent Document 1). According to this, it is possible to assemble the packaging members at the packaging location without using a stitching machine, and it is possible to secure a storage space and to eliminate deterioration in transportation efficiency due to the assembled packaging members.

JP2000-234604

However, in the conventional method, when assembling a packaging member from cardboard, a female fastener is required in addition to a male fastener, and a through hole passing through the overlapping part from the front to the back must be made in advance. It won't happen. Therefore, it is necessary to open a through hole, and the male screw part of the male fastener must be screwed into the female screw part of the female fastener, which requires time and effort to assemble the packaging members. This in itself becomes very complicated.

Therefore, we used a synthetic resin coupling member that has a positioning flange protruding from the base end of the shaft and a spiral protrusion that increases in diameter from the tip to the base end. It is conceivable to connect the cardboard boxes to each other at the overlap part by screwing the spiral protrusion of the shaft of the coupling member into the overlap part between the cardboard boxes from one side in the front and back directions until the flanges abut.

According to such a proposal, the shaft of the connecting member is screwed into the overlapping part of the cardboard boxes from one side in the front and back direction by means of a spiral protrusion at the tip, joining the cardboard boxes at the overlapping part, and penetrating. This makes it possible to simplify the assembly of the packaging member using the male coupling member by eliminating the need for hole opening work and female fasteners, thereby simplifying the assembly work itself.

However, this proposal also has the following problems. In other words, in the proposed method, since the connecting member is molded from synthetic resin, the tip of the spiral protrusion that is inserted from one side in the front and back directions into the overlapping part of the cardboard boxes is brittle due to the material, and cannot be smoothly inserted from one side in the front and back directions. There is a risk that a situation may occur where it cannot be inserted. Moreover, even if the tip of the spiral protrusion can be inserted from one side in the front and back directions, the tip becomes deformed or rounded due to wear each time it passes through multiple liners, making it difficult to penetrate a new liner. There is also a possibility that the overlapping parts of the cardboard boxes cannot be smoothly connected.

The present invention has been made in view of the above points, and its purpose is to improve the ability to effectively protect the tips of the helical protrusions, which are fragile due to the material of the connecting member made of synthetic resin. To provide a coupling tool that can be smoothly inserted into an overlapping part between the two from one side in the front and back direction, and can reliably connect the overlapping part.

In order to achieve the above object, the present invention provides a method in which, when assembling a packaging member using corrugated cardboard having a core that forms a hollow between a plurality of liners, the overlapping parts where the corrugated cardboard overlaps each other are combined. This assumes that the connector is inserted into the overlapping part. Furthermore, a positioning flange is provided protruding from the base end of the shaft body, and a spiral protrusion whose diameter increases from the distal end toward the proximal end side is protruded from the distal end portion of the shaft body, and A coupling member made of synthetic resin is provided with a through hole that passes through the shaft along the center, and an insertion rod whose tip is inserted into the through hole of the coupling member from the base end side of the shaft. and a metal bit having a rotating shaft portion integrally provided at the base end of the insertion rod body. Further, the through hole and the insertion rod are each formed to have a substantially cross-shaped cross section so as to be engaged with each other so as to be able to rotate together when the insertion rod is inserted into the through hole, and the insertion rod is The length is set so that the tip protrudes beyond the tip of the shaft body when inserted into the through hole, and the protruding tip is formed into a tapered cutting edge. Further, the starting end of the spiral protrusion on the distal end side of the shaft body is arranged so as to be continuous with one of the four protrusions of the insertion rod having a substantially cross-shaped cross section. Then, with the insertion rod inserted into the through hole of the coupling member, the rotation of the rotating shaft relative to the overlapping portion causes the helical protrusion to be screwed into the most extreme end of the insertion rod, so that the insertion rod is inserted into the overlapping portion. The insertion rod is screwed in from one side in the front and back directions until it is exposed to the other side in the front and back directions, and then the insertion rod is removed.

Further, the length between the positioning flange and the spiral protrusion on the shaft of the coupling member is set to be shorter than the thickness of the overlapping portion of the plurality of cardboards, and the overlapping portion of the plurality of cardboards is When the spiral protrusion is screwed into the overlapping portion until it is exposed on the other side in the front and back direction, the helical protrusion may be held in a compressed state between the positioning flange and the helical protrusion.

Furthermore, the coupling member may be provided with a lid member that engages and covers the spiral protrusion exposed from the other side in the front and back directions of the overlapping portion.

On the other hand, in order to achieve the above-mentioned object, in the present invention, when assembling a packaging member using corrugated cardboard having a core that forms a hollow space between a plurality of liners, the overlapping portion where the corrugated cardboard overlaps with each other is removed. The premise is that the bonding method uses a coupling tool that is inserted into the overlapping portion so as to bond. Furthermore, a positioning flange is provided protruding from the base end of the shaft body, and a spiral protrusion whose diameter increases from the distal end toward the proximal end side is protruded from the distal end portion of the shaft body, and A coupling member made of synthetic resin is provided with a through hole that passes through the shaft along the center, and an insertion rod whose tip is inserted into the through hole of the coupling member from the base end side of the shaft. and a metal bit having a rotating shaft portion integrally provided at the base end of the insertion rod body. Then, each of the insertion rods each having a substantially cross-shaped cross section is inserted so as to be integrally rotatably engaged with the through hole, and the tip of the insertion rod is made to protrude beyond the tip of the shaft. Then, the leading end formed on the tapered cutting edge of the insertion rod is screwed into the overlapping portion from one side in the front and back direction of the overlapping portion by rotation of the rotating shaft portion. Thereafter, as the leading end of the insertion rod is screwed in, the helical protrusion whose starting end on the distal end side of the shaft body is arranged so as to be continuous with one of the four protrusions of the insertion rod. The insertion rod is screwed into the overlapping portion until it is exposed on the other side in the front and back directions, and then the insertion rod is removed from the through hole of the coupling member.

In short, the insertion rod of the bit is inserted into the through hole of the coupling member, its tip is made to protrude beyond the tip of the shaft, and the spiral protrusion is inserted into the insertion rod by rotating the rotating shaft (bit) relative to the overlapping part. By pulling out the insertion rod while it is screwed in from one side of the overlapping part in the front and back direction to the other side in the front and back direction, the material of the synthetic resin connecting member is fragile. The tip of the insertion rod of the bit, whose tip protrudes beyond the tip, is guided into the drilled hole and protected. This effectively prevents situations in which the tip of the spiral protrusion cannot be smoothly inserted from one side of the overlapping part in the front and back directions, and the tip becomes deformed or rounded due to wear when penetrating multiple liners. can be prevented. As a result, the tip of the spiral protrusion can be smoothly inserted into the overlapping part of the cardboard boxes until it is exposed from one side of the overlapping part in the front and back direction to the other side in the front and back direction as the tip of the insertion rod is screwed in, and the overlapping part is joined. The members can be reliably connected. At this time, the tip of the spiral protrusion exposed on the other side in the front and back direction is not directly inserted into the one side in the front and back direction of the overlapping part, but is guided into the hole drilled by the tip of the insertion rod of the bit and screwed. Therefore, it is safe and does not need to be sharpened.

In addition, the through hole and the insertion rod are each formed to have a substantially cross-shaped cross section, and the starting end of the spiral protrusion on the distal end side of the shaft body is connected to one of the four protrusions of the insertion rod that have a substantially cross-shaped cross section. By arranging the helical protrusions so as to be continuous with each other, the starting end of the spiral protrusion can be smoothly guided to one side in the front and back direction of the overlapping portion by one protrusion of the insertion rod.

In addition, the length between the positioning flange and the spiral protrusion is set shorter than the thickness of the overlapping part, and the overlapping part of multiple cardboards is screwed until the helical protrusion is exposed on the other side in the front and back directions of the overlapping part. By sandwiching the corrugated cardboard in a compressed state between the positioning flange and the helical protrusion when the corrugated cardboard is compressed, the overlapping parts of the cardboard boxes are firmly connected by the reaction force at the time of compression that acts between the helical protrusion and the positioning flange. be able to.

Furthermore, by providing the coupling member with a lid member that covers in an engaged state the spiral protrusion exposed from the other side in the front and back directions of the overlapping part, the spiral protrusion can be covered by the lid member, and When the side is on the inside of the packaging member, the internal contents can be effectively protected from the tip of the spiral protrusion, while on the other hand, when the other side in the front and back direction of the overlapping part is on the outside of the packaging member, there is no contact with the outside. Objects can be effectively protected from the tip of the spiral protrusion.

Moreover, the tip of the insertion rod of the bit, which protrudes beyond the tip of the shaft when inserted into the through hole of the coupling member, is screwed in by the rotation of the rotating shaft with respect to the overlapping part, and as a result of this screwing, a spiral protrusion is formed. By screwing in the overlapping part from one side in the front and back directions until it is exposed to the other side in the front and back directions, and then removing the insertion rod, the tip of the helical protrusion, which is fragile due to the material of the synthetic resin binding member, protrudes beyond that point. The tip of the insertion rod of the bit is used to guide and effectively protect the overlapping part of the corrugated cardboard through a hole made by the tip of the insertion rod. It is possible to provide a joining method using a joining tool that can be inserted smoothly to reliably join overlapping parts.

FIG. 2 is a schematic perspective view of a packaging member assembled using a coupling device according to the present invention. FIG. 2 is a perspective view showing the vicinity of the overlapped portion of the cardboard boxes of the lid constituting the packaging member of FIG. 1; FIG. 2 is a perspective view showing the vicinity of the overlapped portion of the cardboard boxes of the box body constituting the packaging member of FIG. 1; FIG. 2 is a perspective view showing the vicinity of the overlapped portion of other cardboard boxes in the box body of the packaging member shown in FIG. 1; FIG. 2 is a cross-sectional view showing a state of connection at an overlapping portion by a connecting member of the connector shown in FIG. 1; 6 is a longitudinal sectional front view of the coupling member of FIG. 5. FIG. FIG. 6 is a rear view of the coupling member of FIG. 5; FIG. 6 is a plan view of the coupling member of FIG. 5; 6 is a perspective view of the coupling tool seen from one side in the axial direction before the bit is inserted into the through hole of the coupling member in FIG. 5. FIG. 6 is a perspective view of the coupling tool seen from the other side in the axial direction before the bit is inserted into the through hole of the coupling member in FIG. 5. FIG. FIG. 6 is a perspective view of the coupling tool, seen from one side in the axial direction, with a bit inserted into the through hole of the coupling member in FIG. 5; FIG. 6 is a perspective view of the coupling tool, seen from the other side in the axial direction, with a bit inserted into the through hole of the coupling member in FIG. 5; FIG. 13 is a longitudinal sectional front view of the coupling tool with the coupling member shown in FIGS. 11 and 12 cut away. FIG. 14 is a cross-sectional view showing a state of connection at an overlapping portion by the connector of FIG. 13; FIG. 15 is a longitudinal sectional front view of the coupling tool showing a state in which the insertion rod of the bit is removed from the through hole of the coupling member of FIG. 14; 16 is a perspective view of a lid member that covers the spiral protrusion of the coupling member in FIG. 15. FIG. FIG. 17 is a longitudinal sectional front view of the coupling member and the lid member, showing a state in which the spiral protrusions of FIG. 16 are covered. It is a perspective view of the cover member which covers the spiral protrusion of the coupling member based on the modification of this invention. FIG. 19 is a longitudinal sectional front view of the coupling member and the lid member, showing a state in which the spiral protrusions of FIG. 18 are covered.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a coupling device according to an embodiment of the present invention will be described based on the drawings. back

FIG. 1 is a schematic perspective view of a packaging member assembled using a coupling device according to the present invention, and FIG. 2 is a perspective view showing the vicinity of the overlapping portion of the cardboard boxes of the lid constituting the packaging member of FIG. 3 is a perspective view showing the vicinity of the overlap between the cardboard boxes of the box body of the packaging member in FIG. 1, and FIG. 4 is a perspective view showing the vicinity of the overlap area of other cardboard boxes of the box body of the packaging member in FIG. 1. Figures are shown respectively. Further, FIG. 5 is a cross-sectional view showing a state of connection at the overlapping portion by the connecting member of the connector of FIG. 1.

As shown in Figs. 1 to 4, the packaging member indicated by the symbol It is composed of a lid X3 that closes the upper opening of the main body X1, and each of these constituent members X1 to X3 is formed of a two-layered cardboard D (as shown in FIG. 5).

The cardboard D is made of paper, and as shown in FIG. 5, cores D4 and D5 are interposed to form hollow spaces between the front liner D1 and the middle liner D2 and between the middle liner D2 and the back liner D3, respectively. A known two-layer structure is used. At this time, since the interval between the middle liner D2 and the back liner D3 is set narrower than the interval between the front liner D1 and the middle liner D2, the span of the center core D4 between the front liner D1 and the middle liner D2 is It is denser than the span of the center core D5 between the middle liner D2 and the back liner D3.

Further, the distance between the front liner D1 and the middle liner D2 of the cardboard D is set to approximately 3 mm, and the distance between the middle liner D2 and the back liner D3 is set to approximately 5 mm. As a result, the total thickness of the cardboard D is approximately 8 mm.

The box body X1 is provided with a flap X12 at one end of two side plate portions X11, X11, which are bent into an L-shape in a plan view and constitute two sides having a substantially rectangular cross section. Each flap X12 is assembled into a substantially rectangular cross-section by connecting the overlapping portion Z overlapping the other end of each side plate portion X11 with the connecting member 2. At this time, the thickness of the overlapping part Z is twice the thickness of the two cardboard boxes D, and the total thickness is about 16 mm.

The pallet X2 consists of a pallet body X21 that is rectangular in plan view and closes the bottom opening of the box body X1, and flaps X22 provided at both ends of the pallet body X21. This flap X22 is bent approximately 90 degrees with respect to the pallet main body X21, and can be assembled to the lower surface of the box main body X1 by joining it with the connecting member 2 to the overlapping part Z overlapping with the side plate part X11 of the box main body X1. ing.

The lid X3 includes a lid main body X31 having a rectangular shape in plan view that closes the upper opening of the box main body X1, a side plate portion X32 bent approximately 90 degrees from the four edges of the lid main body X31, and a length of the side plate portion X32. It is provided with a flap X33 provided at one end in the width direction. The flap X33 is connected to the overlapping part Z overlapping with the adjacent side plate part X32 by the connecting member 2, so that the lid X3 can be assembled.

The connecting member 2 for assembling the constituent members X1 to X3 of the packaging member It is used for inserting and bonding D into the overlapping part Z where they overlap each other.

6 shows a longitudinal sectional front view of the coupling member of FIG. 5, FIG. 7 shows a rear view of the coupling member of FIG. 5, and FIG. 8 shows a plan view of the coupling member of FIG. 5. 9 is a perspective view of the coupling tool seen from one side in the axial direction before the bit is inserted into the through hole of the coupling member shown in FIG. 5, and FIG. 10 is a perspective view of the coupling tool shown in FIG. A perspective view of the coupler as seen from the other side in the axial direction before the bit is inserted is shown. Furthermore, FIG. 11 is a perspective view of the coupling tool seen from one side in the axial direction with the bit inserted into the through hole of the coupling member shown in FIG. 5, and FIG. 12 is a perspective view of the coupling tool shown in FIG. A perspective view of the coupler in the inserted state seen from the other side in the axial direction is shown, respectively. At this time, one side in the axial direction is the spiral protrusion side of the coupling member 2 and the insertion rod side of the bit, and the other side in the axial direction is the positioning flange side of the coupling member 2 and the rotating shaft side of the bit. .

As shown in FIGS. 6 to 12, the connecting member 2 is made of synthetic resin made of plastic such as PP (polypropylene) or PA (polyamide), and is made of metal made of special alloy steel or the like. Together with the dedicated bit 3, the coupling tool 1 is constructed.

The coupling member 2 includes a disc-shaped positioning flange 22 protruding from the base end of the shaft body 21, and a helical protrusion 23 protruding from the distal end of the shaft body 21. This spiral protrusion 23 expands in diameter while drawing a spiral as it goes from the distal end of the shaft body 21 toward the proximal end side. The coupling member 2 also includes a through hole 24 that passes through the shaft body 21 along the axis of the shaft body 21 .

On the other hand, the dedicated bit 3 includes an insertion rod body 31 whose tip end is inserted into the through hole 24 of the coupling member 2 from the positioning flange 22 side, which is the base end side of the shaft body 21 . Further, the dedicated bit 3 includes a rotating shaft portion 32 that is integrally provided at the base end of the insertion rod body 31. The rotating shaft portion 32 has a hexagonal cross section, and is attached to a chuck of an electric screwdriver (not shown) to electrically rotate the dedicated bit 3 around the axis. Note that the rotating shaft portion 32 can also be attached to the chuck of a manual driver.

The through hole 24 of the coupling member 2 and the insertion rod 31 of the dedicated bit 3 have a non-perfect circular cross section and a specific shape so that they can rotate integrally with the insertion rod 31 inserted into the through hole 24. The cross section is approximately cross-shaped.

The insertion rod 31 includes four projecting pieces 33, 33, . . . that respectively project in a cross direction perpendicular to its axis. Furthermore, the length of the insertion rod 31 is set such that when the insertion rod 31 is inserted into the through hole 24 of the coupling member 2, the tip thereof protrudes beyond the tip of the shaft body 21 and is exposed. The leading end of this insertion rod 31 is formed into a pointed shape. In this case, although the leading end of the insertion rod 31 is sharp, it is only sharp enough to be inserted into the cardboard D by rotation.

Further, the diameter of the insertion rod 31 is smaller than that of the rotating shaft portion 32, and a slope 34 extending from the base end of each projection piece 33 toward the distal end of the rotating shaft portion 32 is formed. Each of the slopes 34 is bent near the tip of the rotating shaft portion 32 so as to converge to a hexagonal cross section.

FIG. 13 shows a longitudinal sectional front view of the coupling tool 1 with the coupling member 2 of FIGS. 11 and 12 cut away. As shown in FIG. 13, the through hole 24 of the coupling member 2 includes four protrusion insertion holes 25, 25, . . . through which the protrusions 33 of the insertion rod 31 are inserted. Each protrusion insertion hole portion 25 includes a slope 26 that extends parallel to the axis of the shaft body 21 and then reduces in diameter to a diameter that substantially matches the diameter of the insertion rod body 31. Further, as shown in FIGS. 8 and 11, the starting end 20 of the spiral protrusion 23 on the distal end side (the upper end side in FIG. 5) of the shaft body 21 is connected to the four protrusions 33, 33, . . . of the insertion rod body 31. It is arranged so as to be continuous with one of the projecting pieces 33. In this case, the starting end 20 of the spiral protrusion 23 has a sharp shape at the leading end of the insertion rod 31, which is exposed more than the tip of the shaft 21 when the insertion rod 31 is inserted into the through hole 24. Because of this, there is no need to sharpen the tip very much.

The slope 26 of each protrusion insertion hole 25 is set at an angle that substantially matches the slope 34 of each protrusion 33 of the insertion rod 31, and the insertion rod 31 is inserted into the through hole 24 of the coupling member 2. By coming into contact with the slope 34 of each projecting piece 33, it functions as a stopper that restricts further insertion of the dedicated bit 3. In this case, the tip of the insertion rod 31 is approximately 4 to 5 mm farther than the shaft 21 of the coupling member 2 when the slope 34 of each protrusion 33 comes into contact with the slope 26 of each protrusion insertion hole 25. It stands out.

The insertion rod 31 of the dedicated bit 3 is inserted into the through hole 24 of the coupling member 2 until the slope 34 of each projection 33 comes into contact with the slope 26 of each projection insertion hole 25, and in this state, the insertion rod The tip of the body 31 protrudes beyond the shaft body 21 of the insertion rod body 31. When the rotating shaft portion 32 of the dedicated bit 3 is attached to the chuck of the electric screwdriver, the dedicated bit 3 is electrically rotated around the axis, and the coupling member 2 is rotated along with the rotation of the dedicated bit 3. There is.

FIG. 14 is a sectional view showing a state of connection at the overlapping part Z by the connector 1 of FIG. 13. As shown in FIG. 14, the coupling member 2 inserts a spiral protrusion 23 into the front side (lower surface in FIGS. 14 and 15), which is one side in the front and back direction of the overlapping part Z, by rotating the dedicated bit 3 around the axis. As the rod body 31 is screwed in at the most extreme end, it is screwed in until it is exposed from the back side (the top surface in FIGS. 14 and 15), which is the other side in the front and back direction of the overlapping part Z, so that the cardboard boxes D, D They are bonded to each other at the polymerization part Z.

Further, the terminal end 29 of the spiral protrusion 23 is bent toward the tip (lower end in FIG. 5) of the shaft body 21 along the axis of the coupling member 2. The terminal end 29 of this spiral protrusion 23 has a function of suppressing the back side of the overlapped part Z when the spiral protrusion 23 is exposed on the back side of the overlapped part Z by screwing until it is exposed from the back side of the overlapped part Z. However, this prevents the coupling member 2 from rotating and prevents it from separating from the overlapping part Z.

Further, the distance between the positioning flange 22 and the spiral protrusion 23 on the shaft body 21 of the coupling member 2 is set to approximately 13 mm, which is shorter by a predetermined amount (for example, about 3 mm) than the thickness of the overlapping portion Z (approximately 16 mm). has been done. Therefore, the overlapping part Z between the cardboard boxes D and D is compressed between the positioning flange 22 and the spiral protrusion 23 when the spiral protrusion 23 is screwed in from the back side of the overlapping part Z until it is exposed. Specifically, the cardboard D on the back side of the overlapping part Z is held in a compressed state. At this time, the spiral protrusion 23 is buried inside the compressed portion of the cardboard D on the back side of the compressed overlapping portion Z.

16 is a perspective view of a lid member that covers the spiral protrusion 23 of the coupling member 2 in FIG. 15, and FIG. 17 is a longitudinal sectional front view of the coupling member 2 and the lid member showing a state in which the spiral protrusion 23 of FIG. 16 is covered. It shows. As shown in FIGS. 16 and 17, the coupling member 2 includes a lid member 4 that covers the spiral protrusion 23 exposed from the back side of the overlapping portion Z in an engaged state.

The lid member 4 is made of synthetic resin made of plastic such as PP or PA, and includes a lid body 41 having a substantially U-shaped cross section. The lid body 41 includes a lid body 42 having a substantially perfect circular shape, and an annular edge 43 that extends from the periphery of the lid body 42 in the axial direction of the coupling member 2 and comes into contact with the back side of the overlapping portion Z. .

The lid member 4 also includes a protrusion 44 that protrudes from the center of the back surface of the lid body 42. The protrusion 44 includes four protrusions 45, 45, . . . that protrude in a cross direction perpendicular to its axis. The protrusion 44 can be inserted into the through hole 24 of the coupling member 2, and the cover member 4 is engaged with the coupling member 2 by inserting each protrusion 45 into the protrusion insertion hole 25 of the through hole 24. That's what I do. At this time, each protrusion piece 45 of the protrusion part 44 is press-fitted into each protrusion insertion hole part 25 of the through hole 24, and the edge part 43 of the lid member 4 is brought into contact with the back side of the overlapping part Z.

The connecting member 2 screwed into the overlapping part Z between the cardboard boxes D and D can be easily removed and reused by inserting a regular bit equipped with a regular Phillips screwdriver into the through hole 24 and rotating it back. Alternatively, it can be easily separated from cardboard D at the time of disposal. In this case, each protrusion 33 of the insertion rod 31 is inserted from the tip of the helical protrusion 23 of the coupling member 2 into each protrusion insertion hole 25 of the through hole 24 from the back side of the overlapping part Z, and then the rotary shaft part 32 is inserted. By rotating the coupling member 2 in the same direction as when it is screwed in, the coupling member 2 rotating in the return rotation direction can be efficiently removed in conjunction with the pushing operation from the back side of the overlapping part Z to the front side. At this time, even if another normal bit equipped with a normal Phillips screwdriver that screws into each protrusion insertion hole 25 of the through hole 24 from the tip of the spiral protrusion 23 of the coupling member 2 is used, the coupling member 2 cannot be removed. Combined with the extrusion operation from the back side of the overlapping part Z to the front side, it is possible to remove it efficiently.

Next, an example of a bonding method for bonding the overlapping portions Z of the cardboards D and D together using the bonding tool 1 will be described.

First, as shown in FIGS. 9 and 10, the tip of the insertion rod 31 of the special metal bit 3 is inserted into the through hole 24 of the synthetic resin coupling member 2 from the positioning flange 22 side of the shaft 21. . When the insertion rod 31 is inserted into the through hole 24, each protrusion insertion hole portion 25 and each protrusion 33 are engaged with each other so that they can rotate together. At this time, it is assumed that the rotating shaft portion 32 of the dedicated bit 3 is attached to the chuck of the electric screwdriver.

Then, as shown in FIGS. 11 and 12, when the insertion rod 31 of the special bit 3 is inserted into the through hole 24 of the coupling member 2, as shown in FIG. The slope 34 of each protrusion 33 of the insertion rod 31 inserted through the insertion rod 25 abuts the slope 26 of each protrusion insertion hole 25 to restrict further insertion of the dedicated bit 3. At this time, the tip of the insertion rod 31 is exposed and protrudes from the shaft 21 of the coupling member 2 by approximately 4 to 5 mm.

Thereafter, when the tip of the insertion rod 31 is brought close to the front side of the overlapping part Z between the cardboard boxes D and D, and the dedicated bit 3 is electrically rotated around the axis using an electric screwdriver, the connecting member 2 is rotated as the dedicated bit 3 rotates. rotates. Then, the tip of the insertion rod 31 is screwed into the overlapping part Z from the front side, and accordingly, the spiral protrusion 23 is screwed into the overlapping part Z from the front side. At this time, as shown in FIG. 11, the starting end 20 of the spiral protrusion 23 on the distal side of the shaft body 21 is continuous with one protrusion 33 of the four protrusions 33, 33, ... of the insertion rod 31. Since the insertion rod 31 is arranged as shown in FIG. There is. At this time, the tip of the spiral protrusion 23 exposed on the back side of the overlapping part Z is not directly inserted into the front side of the overlapping part Z, but is guided into the hole drilled by the tip of the insertion rod 31 of the dedicated bit 3. Since it is screwed in, there is no need to sharpen it and it is safe.

Thereafter, the positioning flange 22 of the connecting member 2 comes into contact with the front side of the overlapping part Z, and when the further connecting member 2 is rotated in this state, the spiral protrusion 23 is screwed in until it is exposed from the back side of the overlapping part Z. Ru. Thereafter, the rotation of the dedicated bit 3 is stopped, and the rotation of the coupling member 2 is stopped. At this time, the cardboard D on the back side of the overlapping part Z is compressed between the positioning flange 22 and the spiral protrusion 23, and the cardboards D and D are joined together at the overlapping part Z. Moreover, when the terminal end 29 of the spiral protrusion 23 is exposed on the back side of the overlapping part Z, the back side of the overlapping part Z is suppressed, and the coupling member 2 is prevented from rotating and is prevented from separating from the overlapping part Z.

Then, as shown in FIG. 15, the insertion rod 31 of the dedicated bit 3 is removed from the through hole 24 of the coupling member 2, and the overlapping portion Z of the cardboard boxes D and D is coupled using the remaining coupling member 2.

Thereafter, as shown in FIG. 17, the protrusion 44 of the lid member 4 is inserted into the through hole 24 of the coupling member 2 from the side of the spiral protrusion 23 of the shaft body 21, and each protrusion insertion hole 25 of the through hole 24 is inserted. The lid member 4 is engaged with the coupling member 2 by press-fitting each protruding piece 45 therein. At this time, the edge 43 of the lid member 4 is in contact with the back side of the overlapping part Z.

Therefore, in the present embodiment, the insertion rod 31 of the dedicated bit 3 is inserted into the through hole 24 of the coupling member 2, and its tip is made to protrude beyond the tip of the shaft 21, so that the overlapping part Z between the cardboard boxes D, D is The insertion rod 31 is pulled out with the spiral protrusion 23 screwed in from the front side to the back side of the overlapping part Z as the leading edge of the insertion rod 31 is screwed in by the rotation of the rotating shaft 32 against the rotation axis. The tip of the helical protrusion 23, which is a fragile material, of the connecting member 2 is guided into a hole drilled by the tip of the insertion rod 31 of the dedicated bit 3 that protrudes beyond the tip, and is protected. This prevents the tip of the spiral protrusion 23 from being inserted smoothly from the front side of the overlapping portion Z, or from being deformed or rounded due to wear each time it passes through the plurality of liners D1 to D3. Can be effectively prevented. As a result, the tip of the spiral protrusion 23 can be smoothly inserted into the overlapping portion Z between the cardboard boxes D and D until it is exposed from the front side to the back side of the overlapping portion Z as the tip of the insertion rod 31 is screwed into the overlapping portion Z. can be reliably connected by the connecting member 2.

Further, the starting end 20 of the spiral protrusion 23 having a substantially cross-shaped cross section on the distal end side of the shaft body 21 is arranged so as to be continuous with one of the four protrusions 33, 33, . . . of the insertion rod body 31. Therefore, the starting end 20 of the spiral protrusion 23 can be smoothly guided to the front side of the overlapping part Z by one protrusion 33 of the insertion rod 31.

In addition, the length between the positioning flange 22 and the spiral protrusion 23 is set shorter than the thickness of the overlapping part Z, and the overlapping part Z between the cardboard boxes D and D makes the spiral protrusion 23 on the back side of the overlapping part Z. When screwed in until it is exposed, the cardboard D on the back side of the overlapping part Z is held in a compressed state between the positioning flange 22 and the helical protrusion 23, so that the space between the positioning flange 22 and the helical protrusion 23 is compressed. The overlapping part Z of the corrugated cardboards D and D can be firmly bonded together by the reaction force at the time of compression that is applied.

Furthermore, since the coupling member 2 is provided with a lid member 4 that engages and covers the spiral protrusion 23 exposed from the back side of the overlapping portion Z, the helical protrusion 23 can be covered by the lid member 4, thereby preventing the overlapping. When the back side of the portion Z is inside the packaging member X, the contents inside the packaging member X can be effectively protected from the tip of the spiral protrusion 23. On the other hand, when the back side of the overlapping part Z is on the outside of the packaging member X, a contact object that contacts the outside of the packaging member X can be effectively protected from the tip of the spiral protrusion 23.

Moreover, the tip of the insertion rod 31 of the dedicated bit 3, which protrudes beyond the tip of the shaft 21 when inserted into the through hole 24 of the coupling member 2, is screwed into the overlapping portion Z by rotating the rotating shaft 32. Since the insertion rod 31 is pulled out after the spiral protrusion 23 is screwed in until it is exposed from the front side to the back side of the overlapping part Z, the spiral protrusion 23 of the synthetic resin coupling member 2 is fragile due to its material. The tip of the cardboard box D is guided and effectively protected by the hole drilled by the tip of the insertion rod 31 of the dedicated bit 3 that protrudes beyond that point, and thereby the overlapping part Z of the cardboard boxes D is protected from the front side to the back side. It is possible to provide a joining method using the joining tool 1 that can reliably join the overlapping part Z by smoothly inserting the spiral protrusion 23 until it is exposed.

Note that the present invention is not limited to the embodiments described above, and includes various other modifications. For example, in the embodiment described above, when the protrusion 44 of the lid member 4 is inserted into the through hole 24 of the coupling member 2, each protrusion 45 is press-fitted into each protrusion insertion hole 25 of the through hole 24, so that the lid member 4 was engaged with the coupling member 2, the edge 43 of the lid member 4 was brought into contact with the back side of the overlapping part Z. As shown in FIGS. 18 and 19, a synthetic resin made of reinforced plastic The lid member 5 is provided with a lid body 51 having a substantially U-shaped cross section, and the lid body 51 includes a lid body 52 having a substantially perfect circular shape, and a lid body 52 extending from the periphery of the lid body 52 in the axial direction of the coupling member 2, and having an overlapping structure. An annular edge portion 53 that presses against the front side of the portion Z, and a ring-shaped edge portion 53 that extends radially inward from one location in the circumferential direction of this edge portion 53, and has a screw thread at its extending end that fits into the spiral groove of the spiral protrusion 23. An arc-shaped threaded portion 54 that fits together may be used. In this case, the lid member 5 engages with the coupling member 2 by screwing the threaded portion 54 into the spiral groove of the spiral protrusion 23, and when engaged, the lid member 5 is crushed against the back side of the overlapping portion Z. The edge portion 53 is brought into pressure contact. This lid member 5 also effectively protects the contents inside the packaging member X and the objects that come in contact with the outside of the packaging member X from the tips of the spiral protrusions 23.

Further, in the embodiment described above, the spiral protrusion 23 exposed from the back side of the overlapping portion Z is covered in an engaged state by the lid member 4, but the spiral protrusion 23 does not necessarily have to be covered by the lid member. good. In other words, the tip of the helical protrusion is not very sharp, and when the helical protrusion is exposed on the back side of the overlapping part Z, the cardboard D on the back side is compressed between the positioning flange 22 and the helical protrusion 23. Coupled with the fact that the helical protrusion 23 is buried in the packing member X, the contents stored inside the packaging member X or the objects that come into contact with the packaging member be.

Further, in this embodiment, the cardboard D having a two-layer structure is used, but a cardboard D having a single-layer structure or a structure of three or more layers may be used. In that case, it is necessary to prepare a joining member that corresponds to the thickness of the overlapped portion of cardboard boxes having a single layer structure or a structure of three or more layers. Specifically, any connecting member may be used as long as it has a shaft portion having a length equivalent to or about 80% of the thickness of the overlapping portion of cardboard boxes having a single layer structure or three or more layers.

Further, in this embodiment, the distance between the middle liner D2 and the back liner D3 is set wider than the distance between the front liner D1 and the middle liner D2, but the distance between the front liner and the middle liner is larger than the distance between the middle liner and the back liner. The distance between the inside liner and the back liner may be set to be the same as the distance between the front liner and the inside liner, or the distance between the inside liner and the back liner may be set narrower than the distance between the front liner and the inside liner.

Further, in the embodiment described above, the cardboard D made of paper is used, but the cardboard made of plastic may also be used.

Further, in the embodiment, the through hole 24 of the coupling member 2 and the insertion rod body 31 of the dedicated bit 3 are each formed to have a substantially cross-shaped cross section, but the invention is not limited to this. It may have a non-circular cross-sectional shape, such as a substantially I-shaped cross-section, a substantially star-shaped cross-section, a polygonal cross-section, a substantially elliptical cross-section, etc., such that the cross-section is engaged so as to be integrally rotatable when inserted through the body.

Furthermore, in the embodiment described above, the spiral protrusion 23 of the coupling member 2 is screwed into the overlapping part Z from the front side, but the spiral protrusion 23 of the coupling member 2 may be screwed in from the back side of the overlapping part. .

Further, in the embodiment described above, the tip of the insertion rod 31 is projected approximately 4 to 5 mm beyond the shaft 21 of the coupling member 2, but the present invention is not limited to this. It may be exposed in a protruding state within a range of approximately 10 mm from the shaft body of the member.

Further, in the embodiment, the box main body X1 is provided with a flap X12 at one end of each of the two side plate portions X11, Although the overlapping part Z with the other end is connected by the connecting member 2, the box main body may be provided with a flap at one end of each of the four side plates constituting four sides each having a substantially rectangular cross section, or may have a substantially rectangular cross section. By providing a flap at one end of one side plate that is bent in a square shape when viewed from above, and connecting the overlapping part of the flap and the side plate with a connecting member, the cross section can be reduced. A substantially rectangular box body may be assembled. On the other hand, depending on the size of the box body, the side plate part constituting one side of the generally rectangular cross section may be constructed by connecting multiple side plate pieces. The connection may be performed by a connection member at an overlapping portion where the ends of the two overlap each other.

1 Coupling tool 2 Coupling member 21 Shaft body 22 Positioning flange 23 Spiral protrusion 24 Through hole 3 Dedicated bit (bit)
31 Insertion rod body 32 Rotating shaft portion 33 Projecting pieces 4, 5 Lid member D Cardboard D1 Front liner (liner)
D2 Medium liner (liner)
D3 Back liner (liner)
D4 Core D5 Core X Packing member Z Overlapping part

Claims (4)

When assembling a packaging member using corrugated cardboard having a core that forms a hollow space between a plurality of liners, it is a coupling tool that is inserted into the overlapping portion where the corrugated cardboard overlaps each other so as to connect the overlapping portion. hand,
A positioning flange is provided protruding from the base end of the shaft body, and a spiral protrusion whose diameter increases from the distal end toward the proximal end side is protruded from the distal end of the shaft body, and the axial center of the shaft body is a synthetic resin coupling member provided with a through hole passing through the shaft along the axis;
A metal having an insertion rod whose tip is inserted into the through hole of the coupling member from the base end side of the shaft body, and a rotating shaft portion integrally provided at the base end of the insertion rod. Equipped with a bit made of
The through hole and the insertion rod are each formed to have a substantially cross-shaped cross section so as to be able to rotate integrally with the insertion rod when inserted into the through hole,
The insertion rod is set to a length such that its tip protrudes beyond the tip of the shaft when inserted into the through hole, and the protruding tip is formed into a tapered cutting edge,
The starting end of the spiral protrusion on the distal end side of the shaft body is arranged so as to be continuous with one of the four protrusions of the insertion rod having a cross-section substantially cross-shaped;
With the insertion rod inserted into the through hole of the coupling member, the rotation of the rotating shaft relative to the overlapping portion causes the spiral protrusion to be inserted in the leading edge of the insertion rod in the front and back directions of the overlapping portion. A coupling device characterized in that the insertion rod is removed from one side until it is exposed to the other side in the front and back directions. The length between the positioning flange and the spiral protrusion on the shaft of the coupling member is set shorter than the thickness of the overlapping portion of the plurality of cardboard boxes,
The overlapping portion of the plurality of cardboard boxes is held in a compressed state between the positioning flange and the spiral protrusion when the helical protrusion is screwed in until it is exposed on the other side in the front and back direction of the overlapping portion. The connector according to claim 1. The coupling device according to claim 1 or 2 , wherein the coupling member includes a lid member that engages and covers the spiral protrusion exposed from the other side in the front and back directions of the overlapping portion . When assembling a packaging member using corrugated cardboard having a core that forms a hollow space between a plurality of liners, a coupling tool is used that is inserted into the overlapping portion so as to connect the overlapping portion where the corrugated cardboard overlaps each other. A joining method,
A positioning flange is provided protruding from the base end of the shaft body, and a spiral protrusion whose diameter increases from the distal end toward the proximal end side is protruded from the distal end of the shaft body, and the axial center of the shaft body is a coupling member provided with a through hole passing through the shaft along the axis;
A bit having an insertion rod whose tip end is inserted into the through hole of the coupling member from the base end side of the shaft body, and a rotating shaft portion integrally provided at the base end of the insertion rod. and,
Inserting the insertion rods each having a substantially cross-shaped cross section so as to be integrally rotatably engaged with the through hole, and causing the tip of the insertion rod to protrude from the tip of the shaft,
Screwing the leading end formed on the tapered cutting edge of the insertion rod into the overlapping part from one side in the front and back direction of the overlapping part by rotation of the rotating shaft part,
Thereafter, as the leading end of the insertion rod is screwed in, the helical protrusion whose starting end on the distal end side of the shaft body is arranged so as to be continuous with one of the four protrusions of the insertion rod. After screwing the strip until it is exposed on the other side of the overlapping part in the front and back direction,
A joining method using a joining tool, characterized in that the insertion rod is removed from a through hole of the joining member.

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