JP5670785B2 - Assembled dustproof box - Google Patents

Description

  The present invention relates to an assembled dustproof box for preventing dust from being scattered when performing a cutting and grinding operation of a dental prosthesis such as a denture base, an inlay, and a crown.

  Dust-proofing (dust collection) devices for preventing dust scattering when performing dental grinding on dental prostheses such as denture bases, inlays, and crowns The whole is formed of a transparent material that has been subjected to antistatic treatment, and a dust collection suction port is built in the housing, and two through holes are inserted into the side wall of the housing at predetermined intervals. There is a housing for dental technician dust collection work, which is provided and provided with a slit elastic material at the periphery of the through hole (see, for example, Patent Document 1).

  If such a dental technician dust collection work case is used, dust can be surely prevented from being scattered by sucking the dust. There is a problem that it is difficult to use in visiting medical care that needs to be carried.

  As a dust collection case that is easy to carry with respect to such problems, an upper and lower case composed of a lower case opened upward and an upper case opened downward, and a transparent front plate accommodated in the upper case or the lower case And left and right side wall plates having an opening that is foldably accommodated in the lower case, and in use, the front plate and the left and right side wall plates are interposed between the upper case and the lower case. There is a foldable dust collection case characterized in that each can be erected (see, for example, Patent Document 2).

  This foldable dust collection case is intended to be used repeatedly, and is carried around with resin waste after use sealed, and after returning from the visit, it is sucked with a vacuum cleaner or washed with water. (Patent Document 2, paragraph number 0020). However, visiting clinics often go to several locations at once, and it is not preferable for hygiene to use the case as it is, and it is very convenient to prepare the case for each destination. There is a problem that is bad.

Japanese Utility Model Publication No. 57-109815 Japanese Patent Laid-Open No. 2003-210491

  In view of the above problems, the present invention is lightweight, compact, easy to carry, easy to assemble before use and easy to disassemble after use, and easy to manufacture and can be manufactured at low cost. It is an object to provide a dustproof box.

As a result of intensive studies to solve the above problems, the present inventors have found that an assembled dustproof box has an opening through which an operator inserts a hand or a polishing tool into the top plate, front plate, back plate, bottom plate, and central portion. With a simple structure consisting of a pair of side plates in which the part is formed, and making them from a single transparent plastic sheet, it can be easily and inexpensively manufactured, so it can also be used as a disposable one. A new article can be used for each visit in visiting medical care etc., and it is hygienic and very convenient.
In addition, a slit-shaped insertion port is provided on the back plate and the bottom plate, an insertion piece is provided on the flap at the end of the side plate, and the end of the back plate on the opposite side of the back plate and the top plate of the back plate If the top plate, front plate, bottom plate, and back plate are in a ring shape, the back plate and bottom plate will not interfere with visibility when performing cutting and grinding operations. By simply inserting or pulling out the insertion piece provided at the end of the side plate into the provided insertion port, it can be easily assembled and disassembled without performing bonding etc. on the spot,
Furthermore, if the front plate is bent at an obtuse angle with respect to the top plate and the back plate facing the front plate is bent at a right angle with respect to the top plate, only the front plate is changed from the top plate side to the bottom plate. The front panel of the front panel is easy to work with its face close to the top panel side of the front panel, and the hand in the assembled dustproof box is on the bottom panel side of the front panel Enough work space can be secured,
On the other hand, when the front plate is bent at an obtuse angle with respect to the top plate and the opposing back plate is bent at a right angle with respect to the top plate, the outer shape does not become a rectangular parallelepiped. The problem arises that it is not possible to easily fold it into two just by folding along the folding line, but the distance from the bottom plate folding curve of the bottom plate to the part of the back plate through the front plate and the top plate If the folding curve is formed in advance on the back plate at the same distance from the bottom plate folding curve of the bottom plate to the part of the back plate through the bottom plate, the cutting and grinding operation is performed. The top plate and the front plate are connected in a ring shape by folding along the folding curve formed on the back plate that does not hinder the field of view and the bottom plate folding curve between the front plate and the bottom plate. The bottom plate and the back plate combined with the back side In than it has led to the completion of the present invention to investigate that can be folded into two easily.

Furthermore, if the notch for passing the cord of the polishing tool is formed on each side plate in a state where it is connected to the opening through the cut line, it may interfere with the cutting and grinding work due to the cord of the disturbing polishing tool. It was also found that it is preferable not to.
In addition, the opening may be an opening having a regular polygonal shape and each side forming a tongue-folding curve, and a dust-proof tongue is formed from each tongue-folding curve toward the center. For example, when the assembly type dustproof box according to the present invention is manufactured from one transparent plastic sheet by die cutting or the like, it can be easily formed and the dustproof effect can be enhanced, which is preferable.

The assembled dustproof box according to the present invention is a top plate in which side plate upper support flaps are connected to both side edges through side plate upper support flap folding curves for bending at right angles toward the back side thereof. A front plate that is connected to the front edge of the top plate through a front plate folding curve for bending at an obtuse angle toward the back side of the top plate, and the back side of the top plate at the rear edge of the top plate A back plate having a slit-like back plate insertion port formed at opposite positions on both sides, and a back plate that is bent at a right angle toward the The bottom plate is connected to the opposite edge of the top plate via a bottom plate folding curve that is bent at an acute angle toward the back side of the front plate. For supporting the lower part of the side plate, which has a slot and bends at both sides at right angles toward the back side The flaps for supporting the lower part of the side plate are connected to each other via the wrap folding curve, and the folding plate is attached to the edge opposite to the front plate at a right angle toward the back side to attach the back plate. The bottom plate with the flaps for attaching the back plate and the side plate folding curve for bending at right angles toward the back side on both side edges of the front plate, An opening for the operator to insert a hand or a polishing tool is formed, and a flap folding curve for contacting the back plate is formed at the edge facing the front plate at a right angle toward the back side. A back plate engaging insertion piece to be inserted into the back plate insertion port of the back plate is formed on the back plate abutting flap provided continuously through the back plate, and from the edge of the bottom plate folding curve Beginning bottom plate abutment for bending at a right angle toward the back side From the pair of side plates formed with bottom plate locking insertion pieces to be inserted into the bottom plate insertion ports of the bottom plate, to the bottom plate contact flaps that are continuously provided via the fold-up curve Because all the above-mentioned boards are made from one transparent plastic sheet, it can be made from one transparent plastic sheet with a simple structure, so it can be manufactured easily and inexpensively, and for disposable use Can be used, and a new article can be used for each visit in visiting medical care etc., and it is hygienic and very convenient.
The back plate and the bottom plate are provided with slit-like insertion holes, and the side plate is provided with an insertion piece at the end of the side plate. Since the plate and the end on the opposite side are attached in advance, the top plate, front plate, bottom plate, and back plate are connected in a ring shape. Easily assemble without inserting or pulling out the insertion piece provided on the end of the side plate into the insertion port provided on the back plate or bottom plate that does not interfere Can be dismantled,
Furthermore, the front plate is bent at an obtuse angle with respect to the top plate, and the back plate facing the front plate is bent at a right angle with respect to the top plate. It is in a state of being inclined in a divergent shape toward the bottom plate, the operator can easily work with the face close to the top plate side of the front plate, and in the assembled dustproof box on the bottom plate side of the divergent front plate Enough work space can be secured,
On the other hand, when the front plate is bent at an obtuse angle with respect to the top plate and the opposing back plate is bent at a right angle with respect to the top plate, the outer shape does not become a rectangular parallelepiped. There is a problem that it is not possible to easily fold it into two just by folding it along the folding line, but the back plate sticking flap on the bottom plate and the end on the opposite side of the top plate on the back plate are attached in advance. As a result, the top plate, front plate, bottom plate, and back plate are connected in a ring shape, and the bottom plate is bent from the bottom plate folding curve of the bottom plate through the front plate and top plate. The folding curve is formed at the position on the back plate where the distance from the bottom plate is the same as the distance from the bottom plate folding curve of the bottom plate to the part of the back plate. Formed on the back plate that does not interfere with visibility when working By folding the folding curve and the bottom plate folding curve between the front plate and the bottom plate, the top plate, the front plate, the bottom plate, and the back plate that are connected in a ring shape are attached to their back surfaces. In the combined state, it can be easily folded into two and can easily be made compact.

  In addition, if the cut portion for passing the cord of the polishing tool is formed on each side plate in a state of being connected to the opening and the cut line, the trouble of the cutting and grinding operation is obstructed by the cord of the disturbing polishing tool. It is preferable that it does not come in contact, and the opening has a regular polygonal shape and each side has a tongue folding curve, and each tongue folding curve has a dustproof tongue toward the center. Can be easily formed when manufacturing the assembled dustproof box according to the present invention by die cutting or the like from one transparent plastic sheet. The dustproof effect can be enhanced, which is preferable.

It is expansion | deployment explanatory drawing which shows one implementation of the assembly-type dustproof box which concerns on this invention. It is explanatory drawing which shows the state which folded the assembly type dustproof box which concerns on FIG. 1 into two with the folding curve for folding, and the bottom plate folding curve, and stuck the back plate sticking flap and the edge part of a back plate. It is explanatory drawing which shows the state which folded the side plate further from the state of the assembly-type dust-proof box of FIG. 2, and was folded into the compact which is easy to carry. It is a perspective view which shows the state which assembled the assembly-type dustproof box folded compactly of FIG. It is a use condition perspective view which shows a mode that the assembly-type dustproof box of FIG. 4 is actually used. It is expansion | deployment explanatory drawing which shows the other Example of the assembly-type dustproof box which concerns on this invention. It is a perspective view which shows the state by which the assembly-type dustproof box of FIG. 6 was assembled. It is a use condition perspective view which shows a mode that the assembly-type dustproof box of FIG. 7 is actually used.

  Hereinafter, an assembled dustproof box according to the present invention will be described in detail with reference to the drawings.

  Reference numeral 1 denotes a top plate in which side plate upper support flaps 1b are connected to both side edges through side plate upper support flap folding curves 1a that are bent at right angles toward the back side. As will be described later, the front plate 2 is connected to the front plate 1 and the rear plate 3 is connected to the rear plate, so that the side plate upper support flaps 1b connected to both side edges are connected to the top plate 1 on the back surface of the side plate 5 described later. By assembling it so that it adheres closely, dust does not scatter from the four sides of the top plate 1 to the outside.

  2 is a front plate that is connected to the front edge of the top plate 1 through a front plate folding curve 2 a for bending at an obtuse angle toward the back side of the top plate 1, and 3 is a rear plate of the top plate 1. It is connected to the edge via a back plate bending curve 3a for bending at a right angle toward the back side of the top plate 1, and slit-like back plate insertion ports 3b are formed at opposite positions on both sides. It is a back plate. The front plate 2 is bent at an obtuse angle with respect to the top plate 1 by the front plate bending curve 2a, and the back plate 3 facing the front plate 2 is bent at a right angle with respect to the top plate 1 by the back plate bending curve 3a. As a result, only the front plate 2 is inclined toward the bottom plate 4 to be described later from the top plate 1 side, and the operator can easily work with the face close to the top plate 1 side of the front plate 2, In addition, on the bottom plate 4 side of the front plate 2 that is widened to the end, a sufficient working space can be secured in which work can be performed by putting a hand into the assembled dustproof box.

  Further, the front plate 2 may have an operator's face close to the face during the cutting and grinding operation. The top plate 1, the bottom plate 4 and the side plates 5 and 5, which will be described later, are continuously provided on the four sides of the front plate 2. Since there is no gap completely, dust does not scatter toward the operator. Furthermore, since the above-mentioned top plate 1 and front plate 2 are portions that the operator looks into, nothing is provided that hinders visibility.

  4 is connected to the edge of the front plate 2 opposite to the top plate 1 through a bottom plate bending curve 4a for bending at an acute angle toward the back side of the front plate 2 and facing both sides. Side plate lower support flap 4d through side plate lower support flap folding curve 4c for forming a slit-shaped bottom plate insertion port 4b at the right and left sides of the side plate at a right angle toward the back side. Are connected to each other, and the back plate attaching flap 4f is connected to the end edge opposite to the front plate 2 through the back plate attaching flap folding curve 4e to bend at a right angle toward the back side. This is a bottom plate.

  Even if some processing is performed on the back plate 3 and the bottom plate 4 described above, the back plate insertion port is provided in the back plate 3 and the bottom plate 4, respectively. 3b and a bottom plate insertion port 4b are formed, and as shown in FIG. 2, the back plate sticking flap 4f of the bottom plate 4 and the end of the back plate 3 opposite to the top plate 1 are used as sticking portions. By attaching them in advance, the top plate 1, the front plate 2, the bottom plate 4 and the back plate 3 are connected in a ring shape.

  5 are respectively connected to both side edges of the front plate 2 through side plate folding curves 5a to bend at right angles toward the back side, so that an operator can insert a hand or a polishing tool into the center portion. The back plate is formed through a back plate abutting flap folding curve 5c to be bent at a right angle toward the back side at the edge facing the front plate 2 The abutment flap 5d is formed with a back plate locking insertion piece 5e to be inserted into the back plate insertion port 3b of the back plate 3, and starts from the edge of the bottom plate folding curve 4a on the back side. The bottom plate is inserted into the bottom plate insertion port 4b of the bottom plate 4 into the bottom plate contact flap 5g connected continuously via the bottom plate contact flap folding curve 5f for bending at a right angle toward the bottom plate 4. This is a side plate on which a face plate locking insertion piece 5h is formed.

The top plate 1, the front plate 2, the back plate 3, the bottom plate 4, and the side plates 5 and 5 are made of a single transparent plastic sheet. As a material for such a plastic sheet, for example, PP (polypropylene) that is transparent and does not obstruct the field of view, PET (polyethylene terephthalate), or the like can be preferably used. In particular, PP is more preferable than PET because it is cheaper than PET, is more flexible and easier to bend than PET, has a good feeling of use, and does not easily scratch the hand.
When such a material is used, the thickness of the plastic sheet is preferably 0.2 to 0.3 mm. If it is thinner than 0.2 mm, it tends to be deformed, and it may be difficult to maintain its shape when the assembled dustproof box according to the present invention is assembled. This increases the difficulty of assembly and increases the material cost. In particular, when the thickness is 0.25 mm, although the shape can be firmly maintained, it is moderately soft, so when the operator puts his / her hand in through the opening 5b provided in the central portion of the side plate 5 It is more preferable not to hurt or feel uncomfortable pain.

In the assembled dustproof box according to the present invention, the back plate locking insert 5e of the side plate 5 is used as the back plate insertion port 3b of the back plate 3, and the bottom plate locking insert 5h of the bottom plate 4 is used. Since it can be easily assembled simply by being inserted into the bottom plate insertion port 4b, and it is simply inserted without bonding or the like, disassembly after use can be facilitated and it is easy to use.
Further, the opening 5b provided in the central portion of the side plate 5 has a regular polygonal shape, and each side thereof forms a tongue-fold bending curve 5ba, and each dust-breaking curve 5ba is directed to the center portion for dust-proofing. When the tongue 5bb is formed in the opening, it can be easily formed when the assembly type dustproof box is manufactured from one transparent plastic sheet, and the dustproof effect can be enhanced. It is possible and preferable. Further, as shown in FIGS. 1 to 8, the outer shape of the tongue piece 5bb is curved toward the center of the opening 5b following the straight cut between the adjacent tongue pieces 5bb and 5bb. If it is formed in this way, it is preferable that the operator does not get injured or feel uncomfortable pain when putting the hand in and out of the opening 5b.

6 is a distance from the bottom plate folding curve 4a of the bottom plate 4 to the part of the back plate 3 through the front plate 2 and the top plate 1, and the back plate from the bottom plate folding curve 4a of the bottom plate 4 through the bottom plate 4. 3 is a folding curve for folding formed at a position on the back plate 3 where the distance to a part of 3 is the same.
The assembled dustproof box according to the present invention is assembled so that the front plate 2 is bent at an obtuse angle with respect to the top plate 1 and the opposing back plate 3 is bent at right angles with respect to the top plate 1. However, there is a problem that it is not possible to fold it into two simply by folding along a folding line like a rectangular parallelepiped, but the front plate 2 and the top plate 1 are separated from the bottom plate folding curve 4a of the bottom plate 4. And the distance from the bottom plate 4 to the part of the back plate 3 from the bottom plate folding curve 4a of the bottom plate 4 through the bottom plate 4 is the same position. Even if it is such a special shape, it can be easily folded in two by providing the folding curve 6 for folding separately on the back plate 3 that does not disturb the above.

  Reference numeral 7 denotes a cut portion provided in the side plate 5 for passing the cord C of the polishing tool, and is formed in each of the side plates 5 and 5 in a state of being connected via the opening 5b and the cut 7a. If the cut portion 7 is provided, it is preferable that the cord C of the hindering polishing tool does not interfere with the cutting and grinding operation.

In order to actually manufacture such an assembled dustproof box according to the present invention, first, a single transparent plastic sheet is die-cut into a shape as shown in FIGS. At the same time, each folding line is formed (note that each folding line is indicated by a one-dot chain line in each figure).
At that time, the cut portions 7 formed in the side plates 5 and 5 in a state of being connected to each other through the opening 5b and the cut 7a in order to pass the cord C of the polishing tool, and the outer shape is a regular polygonal shape. Each of the sides forms a tongue folding curve 5ba, and the opening 5b in which the dust-proof tongue 5bb is formed from each tongue folding curve 5ba toward the center can be easily removed by such die cutting. Can be manufactured.

  Then, for example, the assembled dustproof box according to the present invention is folded from the state of FIG. 1 as shown in FIG. 2, the bottom plate 4 at its bottom plate folding curve 4a, and the back plate 3 at its folding curve 6. The back plate sticking flap 4f of the bottom plate 4 is attached to the end of the back plate 3 opposite to the top plate 1 so that the top plate 1, the front plate 2, the bottom plate 4 and the back plate 3 are in a ring shape. Make it connected. Further, if the side plates 5 and 5 are bent along the side plate folding curves 5a and 5a, respectively, they can be folded very compactly as shown in FIG.

  By manufacturing in this way, it can be manufactured easily and inexpensively, so it can be used as a disposable one, and can be folded in a very compact manner, so that it is easy to carry multiple sheets in visiting clinics etc. In addition, a new article can be used for each visited place, and it is hygienic and very convenient to use.

  Further, in order to actually assemble the assembled dustproof box folded in this manner, for example, when folded in the state as shown in FIG. 3, first, the side plates 5 and 5 bent at the side plate folding curve 5a are respectively attached. Next, the top plate 1, the front plate 2, the bottom plate 4, and the back plate 3 that are folded into two in a ring shape are expanded so that the entire cross-section becomes a trapezoid, and the shape is adjusted, and The back plate locking insertion pieces 5e and 5e of the side plates 5 and 5 are inserted into the slit-like back plate insertion openings 3b formed at opposite positions on both sides of the back plate 3 and the bottom plate 4 It can be easily assembled by inserting the bottom plate locking inserts 5h and 5h of the side plates 5 and 5 into the slit-shaped bottom plate insertion port 4b formed at the opposite positions on both sides of the plate. It can be done.

At that time, the surface of the side plate upper support flaps 1b, 1b of the top plate 1 and the surface of the side plate lower support flaps 4d, 4d of the bottom plate 4 are brought into contact with the back surfaces of the side plates 5, 5. By folding and assembling, the flaps (side plate upper support flap 1b, side plate lower support flap 4d) folded at each fold curve (side plate upper support flap fold curve 1a, side plate lower support flap fold curve 4c) In order to return to the stretched state due to the elasticity of the plastic sheet, it is possible to improve the sealing performance by being in close contact with the back surfaces of the side plates 5 and 5.
As shown in FIGS. 1 to 8, the opening 5b provided in the central portion of the side plate 5 has a regular polygonal shape and each side thereof forms a tongue-fold folding curve 5ba and is centered from each tongue-folding curve 5ba. If each of the openings is formed with a dust-proof tongue piece 5bb toward the part, the dust-proof effect can be enhanced by the tongue piece 5bb, and the outer shape of the tongue piece 5bb is changed to the adjacent tongue pieces 5bb, 5bb. If it is formed so as to form a curved line toward the center of the opening 5b following the straight cut between them, the operator may be injured or feel uncomfortable pain when putting in and out of the hand from the opening 5b. It is preferable because there is nothing.

  Next, in order to actually use the assembled dustproof box according to the present invention, in the embodiment in which the cut portion 7 for passing the cord C of the polishing tool is formed as shown in FIGS. Is inserted from the opening 5b of the side plate 5, the cord C of the polishing tool is guided from the opening 5b of the side plate 5 to the notch 7 through the cut 7a, and the cord C of the polishing tool is locked to the notch 7 Let After making such a state, if working with a dental prosthesis such as a denture base, an inlay, a crown, etc. that performs a cutting and grinding operation in one hand as shown in FIG. The troubled grinding / grinding work is not hindered by the disturbing polishing tool code C, and a reliable work can be performed.

  In addition, after completion of such cutting and grinding work, the assembled dustproof box can be disassembled into a compact shape as shown in FIGS. 2 and 3, so that it can be reused by taking it away from the place of visit and washing it with water. However, since it can be manufactured easily and inexpensively as described above, it can be discarded at the place of visit or taken back and discarded.

1 Top plate
1a Flap folding curve for supporting the upper side plate
1b Side plate upper support flap 2 Front plate
2a Front plate folding curve 3 Back plate
3a Back plate folding curve
3b Rear plate insertion slot 4 Bottom plate
4a Bottom plate folding curve
4b Bottom plate insertion slot
4c Flap folding curve for supporting the lower side plate
4d Side plate lower support flap
4e Flap fold curve for attaching the back plate
4f Flap for attaching back plate 5 Side plate
5a Side plate bending curve
5b opening
5ba tongue folding curve
5bb tongue
5c Flap fold curve for back plate contact
5d Back plate contact flap
5e Insert for locking rear plate
5f Flap fold curve for bottom plate contact
5g Flap for bottom plate contact
5h Bottom plate locking insert 6 Folding fold curve 7 Notch
7a Cut C Polishing tool code

Claims (3)

A top plate (1) having side plate upper support flaps (1b) connected to both side edges via side plate upper support flap folding curves (1a) to be bent at right angles toward the back side ,
A front plate (2) connected to the front edge of the top plate (1) via a front plate folding curve (2a) for bending at an obtuse angle toward the back side of the top plate (1); ,
It is connected to the rear edge of the top plate (1) through a back plate folding curve (3a) for bending at a right angle toward the back side of the top plate (1), and is opposed to both sides. A back plate (3) in which a slit-like back plate insertion port (3b) is formed at a position;
The front plate (2) is connected to the edge opposite to the top plate (1) via a bottom plate folding curve (4a) for bending at an acute angle toward the back side of the front plate (2). A slit-shaped bottom plate insertion slot (4b) is formed at opposite positions on both sides, and the side plate lower support flap folds are bent at right angles toward the back side on both side edges. Side plate lower flaps (4d) are connected to each other via a curved line (4c), and the back is bent at a right angle toward the back side at the edge opposite to the front plate (2). A bottom plate (4) in which a back plate attaching flap (4f) is continuously provided via a face plate attaching flap folding curve (4e);
The front plate (2) is connected to both side edges via a side plate folding curve (5a) to bend at right angles toward the back side, and an operator puts a hand or a polishing tool in the center. An opening (5b) for insertion is formed, and a back plate abutting flap folding curve (5c) for bending the end plate facing the front plate (2) at a right angle toward the back side. A back plate locking insertion piece (5e) to be inserted into the back plate insertion port (3b) of the back plate (3) is formed in the back plate abutting flap (5d) continuously provided via And is continuously provided via a bottom plate contact flap folding curve (5f) for bending at a right angle from the edge of the bottom plate folding curve (4a) toward the back surface side. A pair of side plates (5h) in which a bottom plate locking insertion piece (5h) to be inserted into a bottom plate insertion port (4b) of the bottom plate (4) is formed in the bottom plate contact flap (5g). , 5)
All the plates (1, 2, 3, 4, 5) are made from one transparent plastic sheet,
The top plate (1) is attached in advance by attaching the back plate attaching flap (4f) of the bottom plate (4) and the end of the back plate (3) opposite to the top plate (1). ), The front plate (2), the bottom plate (4), and the back plate (3) are connected in a ring shape, and the bottom plate folding curve (4a) of the bottom plate (4) From the distance between the front plate (2) and the top plate (1) to a part of the back plate (3) and the bottom plate folding curve (4a) of the bottom plate (4), the bottom plate (4 ), And a folding curve (6) is formed at a position on the back plate (3) where the distance to the back plate (3) reaches a part through the same. box.   A notch (7) through which the cord (C) of the polishing tool is passed is formed in each side plate (5, 5) in a state of being connected to the opening (5b) via a cut (7a). Assembly type dustproof box as described in 1.   The opening (5b) has a regular polygonal outer shape, and each side thereof forms a tongue folding curve (5ba), and each tongue folding curve (5ba) toward the center of each dustproof tongue ( The assembled dustproof box according to claim 1 or 2, which is an opening in which 5bb) is formed.

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