TW201321276A - Corner protector and sheet material therefor - Google Patents

Abstract

The invention discloses a corner protector and a sheet material for folding to form the corner protector. The corner protector can be formed by folding the sheet material formed in one piece. The corner protector includes a body and a bent spring structure. The body has an accommodating space and an opening communicating with the accommodating space. The bent spring structure is disposed in the accommodating space and has a free end portion and a fixed end portion fixed on the body. When a corner of an object is inserted through the opening into the accommodating space, the corner presses the bent spring structure such that the free end portion can slide on the inner wall in the accommodating space so as to deform the bent spring structure elastically. The deformed bent spring structure loads the corner with an elastic force so that the corner protector can be attached to the corner firmly, which solves the problem that a conventional corner protector is easy to fall from a corner of an object it is attached to.

Description

Socket and its plate

The invention relates to a set angle and a plate for folding a set of corners, in particular to a set angle and a plate thereof which can be firmly fixed to the corner of the object.

Many corners of the plate are not easy to protect, so they are currently protected by a set of angles. The common set angles include plastic injection molding and sheet folding forming. Among them, the sheet folding forming is mostly made of cardboard, and the surface of the cardboard is mostly flat, which is difficult to produce a holding structure or holding effect with the object, especially when the object is in the corner. When it is also a flat structure, the set angle is easily slipped off from the corner. At present, in the paper sleeves used for the picture frame, the two-part cardboard is symmetrically folded into the sleeve, and the sleeve angle can be increased, and the sleeve angle can be applied to the thin frame. However, the folded cardboard is still flat. After being inserted and used for a long time, its elasticity is fatigued. At this time, it is no different from the general set angle, and the above problems have not been effectively solved. At present, there is another paper set angle, which cuts a corner from the plate body to bend into the corner of the sleeve to obtain a holding structure for holding with the corner structure of the object, and also provides a slight clamping force. If the user forgets to fold the folded corner portion, the function of the holding structure cannot be exerted, and this is also the same as the general set angle, and the foregoing problems have not been effectively solved. When used in a flat object, the set angle can only hold the object by the slight elastic force generated by the corner portion, and the slight elastic force will be used after many times, and the remaining is still substantially The gusset angle is almost the same; if the cutting area of the knuckle portion is enlarged to produce a large clamping elastic force, the larger knuckle portion will greatly reduce the strength of the gusset structure, and it is difficult to provide a stable clamping force with the folding portion. And after repeated use, it is easy to cause the corner damage.

In view of the problems in the prior art, one of the objects of the present invention is to provide a ferrule that increases the clamping force on the clamped article by the internal curved sprocket structure, and the curved sprocket structure has better fatigue resistance and larger The modulus of elasticity is suitable for long-term use.

The gusset of the present invention is used to cover a corner of an object, and the holster includes a body and a curved elastic structure. The main body has an accommodating space and an opening that communicates with the accommodating space. The curved elastic piece structure is disposed in the accommodating space and has a fixed end portion and a free end portion. The fixed end portion is fixed on the body. When the corner of the object is inserted into the accommodating space through the opening, the angle presses the curved elastic structure, so that the free end can slide on the inner wall of the accommodating space to elastically deform the curved elastic structure. The deformed curved dome structure exerts an elastic force on the corner. Thereby, the curved elastic piece structure simultaneously utilizes the fixed end and the support of the free end to provide the elastic force, so the bending elastic piece structure has high fatigue resistance and the elastic deformation coefficient is obtained by the elastic deformation coefficient formed only by the fixed end support. Large, the curved elastic structure of the present invention provides a larger elastic force and is more stably attached to the object. In addition, the elastic deformation structure formed by the curved elastic piece structure is substantially triangular, so that the portion of the curved elastic piece structure that contacts the object is an intermediate portion thereof, and if the corner of the object has a non-flat surface structure, it is also advantageous. The structure is stuck. Therefore, the gusset of the present invention can be effectively attached to the article and has better fatigue resistance and can be used multiple times.

One of the objects of the present invention is to provide a sheet material for folding into a set of corners, and forming a curved elastic piece structure inside the set angle by the elastic plate portion to increase the clamping force on the clamped object, and the curved elastic piece structure has better Anti-fatigue and large modulus of elasticity for long-term use.

The board of the present invention comprises a top plate portion, a spring plate portion, a bottom plate portion, a first side plate portion and a second side plate portion. The top plate portion has a first side edge and a second side edge, the spring plate portion has a first fixed end portion and a first free end portion, the first fixed end portion is connected to the top plate portion, and the bottom plate portion has a first side plate portion connecting the first side edge and the third side edge, the second side plate portion being connected to the second side edge or the first side plate portion Fourth side. The first elastic plate portion is bent to form a curved elastic structure and the free end portion is slidable on the top plate portion, and the top plate portion and the bottom plate portion are bent relative to the first side plate portion, and the first portion The two side plate portions are bent relative to the top plate portion or the bottom plate portion to connect the second side edge and the fourth side edge to form an accommodating space and communicate with one opening of the accommodating space, so that the curved elastic piece structure is located at the In the space, when a corner of an object is inserted into the accommodating space through the opening, the corner presses the curved elastic structure to elastically deform the curved elastic structure, and the deformed curved elastic structure applies an elastic force to the corner. Therefore, the sheet of the present invention can be folded to form the gusset of the present invention; similarly, the gusset formed by folding the sheet can also provide a large elastic force, effectively adhere to the object, and has better fatigue resistance. Can be used multiple times.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

Please refer to FIG. 1 and FIG. 2, FIG. 1 is a schematic view of a set of corners 1 according to a preferred embodiment of the present invention, and FIG. 2 is a cross-sectional view of the set angle 1 taken along line X-X of FIG. 1. The ferrule 1 includes a body 12 and a first curved slab structure 14. The body 12 can have an accommodating space 122 , an opening 124 connecting the accommodating spaces 122 , and an edge 126 at the opening 124 . The first curved elastic piece structure 14 has a first fixed end portion 142 and a first free end portion 144. The first curved elastic piece structure 14 is disposed in the accommodating space 122, and the first fixed end portion 142 is fixed on the body 12. In this embodiment, the first curved elastic structure 14 is formed by extending from the edge 126. In practice, the first curved elastic structure 14 is also a separate object, and is fixedly attached to the body 12 in an adhesive manner. The first free end portion 144 is slidably contacted with the inner wall 128 of the accommodating space 122. In practice, the first free end portion 144 can also be suspended before the object 2 (see FIG. 3) is inserted into the accommodating space 122. . The first curved elastic structure 14 can have a bent portion 146 between the first fixed end 142 and the first free end 144.

Please refer to FIG. 2 and FIG. 3 . FIG. 3 is a cross-sectional view of the object 2 (eg, glass, solar substrate, but not limited thereto) at a corner 22, and the cross-sectional position thereof is the same as that of FIG. 2 . When the corner 22 of the object 2 is inserted into the accommodating space 122 via the opening 124, the corner 22 presses the first curved elastic structure 14 such that the first free end 144 slides on the inner wall 128 to elastically deform the first curved elastic structure 14 . The deformed first curved elastic structure 14 exerts an elastic force F1 on the corner 22 of the object 2 via the bent portion 146, thereby firmly adhering to the corner 22 of the object 2. This elastic force F1 is a positive force, which can increase the frictional force on the corner 22 of the object 2, and will not be described again. As shown in FIG. 3, the first curved elastic structure 14 utilizes the support of the first fixed end 142 and the first free end 144 to provide the elastic force F1, so that the elastic deformation coefficient of the first curved elastic structure 14 is only a single The first fixed end portion 142 supports the formed elastic deformation coefficient to be large, that is, the value of the elastic force F1 is large, and the fatigue strength is high, so that it can be used multiple times. It should be noted that, in this embodiment, before the object 2 is inserted into the gusset 1, the bent portion 146 of the first curved elastic structure 14 does not contact the opposite inner wall 130 of the accommodating space 122, but the present invention does not Limited. In principle, the greater the amount of deformation of the first curved elastic structure 14 caused by the insertion of the object 2 into the gusset 1, the greater the value of the elastic force F1 generated, so when the bending portion 146 contacts the inner wall 130, when the object 2 is inserted The value of the resulting elastic force F1 is in principle greater.

Please refer to FIG. 4, which is a cross-sectional view of a set of corners before the insertion of the article 2 according to another embodiment. The bent portion 147 of the first curved elastic piece structure 15 of the gusset in FIG. 4 is a fold line, so that the cross section of the first curved elastic piece structure 15 has a triangular structure, and the first of the set angles 1 in FIG. 3 is opposite. The curved elastic structure 14 has an arc-shaped structure as a whole without obvious creases. Regardless of the triangular or curved configuration, the first curved shrapnel structures 14, 15 provide a higher clamping force than conventional techniques.

In addition, in the foregoing embodiments, the first curved elastic structures 14 and 15 are formed from the edge 126 and occupy the entire edge 126, but the invention is not limited thereto. Please refer to FIG. 5, which is a schematic diagram of a set of corners 3 according to another embodiment. The gusset 3 is substantially identical to the gusset 1 structure, the main difference being that the first curved slab structure 34 of the gusset 3 occupies a portion of the edge 126, i.e., the length of the connecting edge 126 of the first curved slab structure 34 is less than the length of the rim 126. However, the other structures of the first curved elastic structure 34 are still the same as the first curved elastic structure 14, so that the sleeve angle 3 can also exert the same effect as the sleeve angle 1, and will not be described again. In addition, for other descriptions of the gusset 3, please refer to the description of the gusset 1 mentioned above, and no further details are provided.

Please refer to FIG. 6 and FIG. 7. FIG. 6 is a schematic view of a set of corners 4 according to another preferred embodiment of the present invention, and FIG. 7 is a cross-sectional view of the set angle 4 along line YY of FIG. . The sleeve angle 4 further includes a second bending elastic structure 16 disposed in the accommodating space 122 and having a second fixed end portion 162, a second free end portion 164 and a bent portion. 166 is between the second fixed end 162 and the second free end 164 , and the second fixed end 162 is fixed to the body 122 . In this embodiment, the second curved elastic structure 16 and the first curved elastic structure 14 are symmetrically disposed opposite to each other in the accommodating space 122, and the second curved elastic structure 16 is formed from the edge 132 of the opposite edge 126. Similarly, the second free end portion 164 is slidably contacted with the inner wall 130 of the accommodating space 122. In practice, the second free end portion 164 can also be suspended before the object 2 is inserted into the accommodating space 122. In addition, in the present embodiment, before the corner 22 of the object 2 is not inserted into the accommodating space 122, the first curved elastic structure 14 contacts the second curved elastic structure 16, whereby the first curved elastic structure is inserted after the angle 22 is inserted. The contact with the second curved elastic structure 16 can achieve a large amount of deformation.

Please refer to Fig. 7 and Fig. 8. Fig. 8 is a cross-sectional view of the corner 22 of the object 2 in the set angle 4 in Fig. 6, and the cross-sectional position is the same as that of Fig. 7. When the corner 22 of the object 2 is inserted into the accommodating space 122, the angle 22 simultaneously presses the first curved elastic structure 14 and the second curved elastic structure 16, so that the first free end 144 and the second free end 164 respectively occupy the accommodating space. The inner wall 128, 130 of the cover 122 slides to elastically deform the first curved elastic piece structure 14 and the second curved elastic piece structure 16, and the deformed first curved elastic piece structure 14 and the second curved elastic piece structure 16 respectively pass through the bent portion 146, 166 applies a relative spring force F1, F2 on the corner 22, which in turn creates a gripping effect, so that the sleeve angle 4 is also firmly attached to the corner 22 of the article 2. For other descriptions of the gusset 4, please refer to the related description of the gussets 1, 3, and will not be described again. In addition, in the foregoing description of the deformation of the first curved elastic structure 14, as described in relation to the first curved elastic structure 15, 34, the second curved elastic structure 16 is also applicable, and will not be further described.

It should be noted that, if the corners of the objects inserted into the corners 1, 3 or 4 have a non-flat structure, the first curved elastic structures 14, 15, 34 and the second curved elastic structure 16 may also generate a certain degree of card with the structure. Hold the effect. Please refer to Figure 9, which is a cross-sectional view of the set of 4 sets of another object. The object has a non-flat structure 24 (eg, a frame) at its corner 22, and logically, the object can be viewed as an object 2 plus a frame, so that when the corner 22 is inserted, the first curved elastic structure 14 and the second curved elastic piece The bent portions 146, 166 of the structure 16 can be engaged with the structure 24 to produce a certain degree of gripping effect.

In addition, in the foregoing embodiment, the accommodating spaces 122 of the slanting angles 1, 3, and 4 are in the shape of a triangular column, but the invention is not limited thereto. In principle, the design of the accommodating space 122 should be viewed from the set angles 1, 3 or 4 is determined by the matching contour of the corner 2 of the object 2, so it is not limited to the triangular column shape. In addition, the material of the set angle 1, 3 or 4 is made into a visual product design specification, for example, a paper material, an engineering plastic, a silicone rubber, a rubber, etc., and the invention is not particularly limited; The forming or the sheet is formed by folding, or formed by other methods, for example, by laminating a plurality of sheets of the same material or different materials, and the present invention is not particularly limited.

Referring to Figure 10, there is shown a schematic view of a sheet 5 in accordance with a preferred embodiment of the present invention. In the present embodiment, the sheet 5 is used to fold the set angle 1, so hereinafter, please refer to the foregoing drawings regarding the gusset 1 and related description, unless otherwise stated. As shown in FIG. 10, the sheet 5 may include a top plate portion 52, a first elastic plate portion 54, a bottom plate portion 56, a second side plate portion 58, a second side plate portion 60, and a third side plate portion 62. The top plate portion 52 has a first side edge 522 and a second side edge 524. The first elastic plate portion 54 has a first fixed end portion 542 and a first free end portion 544, and the first fixed end portion 542 (ie, The first fixed end portion 142) is connected to the top plate portion 52. The bottom plate portion 56 has a third side 562 and a fourth side 564. The first side plate portion 58 connects the first side 522 and the third side 562. The side plate portion 60 is coupled to the second side edge 524 with respect to the first side plate portion 58, and the third side plate portion 62 is coupled to the fourth side edge 564.

The first elastic plate portion 54 is bent to form the first curved elastic structure 14 such that the first free end portion 544 (ie, the first free end portion 144) can be applied to the top plate portion 52 (ie, the inner wall 128 of the accommodation space 122). The top plate portion 52 and the bottom plate portion 56 are bent relative to the first side plate portion 58, and the second side plate portion 60 and the third side plate portion 62 are bent relative to the top plate portion 52 and the bottom plate portion 56 to connect the second side edge 524, respectively. And the fourth side 564, the opening 124 of the accommodating space 122 and the accommodating space 122 are formed, such that the first curved elastic structure 14 is located in the accommodating space 122, wherein the second side plate portion 60 overlaps with the third side plate portion 62. The side wall of the accommodating space 122 is opposite to the first side plate portion 58. Therefore, the size of the third side plate portion 62 does not need to be the same as the size of the second side plate portion 60. In practice, the second side plate portion 60 can also be connected to the second side plate portion 60. The four side edges 564 and the third side plate portion 62 are connected to the second side edge 524 to achieve the effect of forming the side walls. Moreover, if the second side plate portion 60 is further enlarged so that a portion of the second side plate portion 60 can be directly overlapped to the bottom plate portion 56, the third side plate portion 62 can also be omitted; in this case, the second side plate portion 60 can also be modified. Connected to the fourth side 564, a portion of the second side panel portion 60 can be directly laminated to the top panel portion 52, and the sidewalls can be formed.

After the sheet 5 is folded, the sleeve 1 is as described above. For other structural changes of the sleeve 1 described above, those skilled in the art can easily adjust the bending operation of the sheet 5 according to other structural descriptions of the sleeve 1 described above. In order to form the desired structure, it will not be described again; for the description of the insertion of the object 2 into the horn 1, please refer to the foregoing and will not repeat. In addition, in the bending operation of the sheet 5, in practice, a fold is formed on the sheet 5 to bend it so as to be correctly bent, as shown by the dotted line in FIG. 10; however, the present invention does not This is limited to this. In addition, the top plate portion 52 has a fifth side 526 formed on the edge 126 of the opening 124. In the embodiment, the first fixed end portion 542 is connected to the fifth side 526, and since the plate is integrally formed, the first The fixed end 542 extends from the fifth side 526. In FIG. 10, the fifth side edge 526 of the top plate portion 52 is slightly longer than the crease between the top plate portion 52 and the first elastic plate portion 54, and the reserved length is to prevent the first side plate portion 58 from being bent after the sheet 5 is bent. And the interference that the second side plate portion 60 and the top plate portion 52 may cause, structurally, the connection of the first elastic plate portion 54 and the top plate portion 52 may still be regarded as occupying the entire edge 126.

Please refer to FIG. 4 and FIG. 11 . FIG. 11 is a schematic view of a plate according to another embodiment. After the plate is bent, a gusset shown in FIG. 4 can be formed. The outline of the sheet of Fig. 11 is the same as that of the sheet of Fig. 10, the main difference being that the first shrapnel portion 54 of the sheet of Fig. 11 still has a fold line 546 such that the first shrapnel portion 54 is opposite the fold line 546. The bent portion 147 of the first curved elastic structure 15 in Fig. 4 is bent. For the description of the gusset formed by the sheet of Fig. 11, please refer to the description of the gusset of Fig. 4 in the foregoing, and will not repeat.

Referring to FIGS. 5 and 12, FIG. 12 is a schematic view of a sheet 6 according to another embodiment. After the sheet 6 is bent, the gusset 3 shown in FIG. 5 can be formed. The sheet 6 is substantially identical in contour to the sheet 5, the main difference being that the length of the first side 526 of the first elastic end portion 642 of the sheet 6 joined to the fifth side 526 of the top plate portion 52 is less than the length of the fifth side 526. That is, the length of the connecting edge 126 of the first curved elastic structure 34 is less than the length of the edge 126. For the description of the gusset 3 formed by the sheet 6, please refer to the description of the gusset 3 in the foregoing, and will not repeat.

Referring to Figures 6 and 13, Figure 13 is a schematic view of a sheet 7 according to another preferred embodiment. After the sheet 7 is bent, the sleeve 4 shown in Figure 6 can be formed. Compared with the plate 5, the plate 7 further includes a second elastic plate portion 74 having a second fixed end portion 742 and a second free end portion 744, and the second fixed end portion 742 (ie, the second fixed end portion) 162) Connecting the bottom plate portion 56, the second elastic plate portion 74 is bent to form the second curved elastic piece structure 16 and enables the second free end portion 744 (i.e., the second free end portion 164) to slide on the bottom plate portion 56. In this embodiment, the second elastic plate portion 74 is structurally symmetrical with the first elastic plate portion 54. Therefore, the first curved elastic piece structure 14 and the second curved elastic piece structure 16 are also symmetrically disposed in the accommodating space 122. For other related descriptions of the second elastic plate portion 74, refer to the related description of the first elastic plate portion 54, and details are not described herein. For a description of the ferrule 4 formed by the sheet material 7, please refer to the description of the ferrule 4 in the foregoing, and will not be repeated; and other structural changes of the ferrule 4 described above, those skilled in the art of the present invention can Other constructions of the gusset 1 illustrate the ease of adjusting the bending operation of the sheet 7 to form the desired structure, and will not be described again.

Similarly, the accommodating space 122 formed by the plates 5, 6 and 7 has a triangular column shape, but the invention is not limited thereto. In principle, the accommodating space 122 is designed to accommodate the sill angles 1, 3 or 4 and the object 2 The angle of the corner 2 is determined, so it is not limited to the triangular column shape. Moreover, the sheets 5, 6 and 7 can be made of paper materials, but the invention is not limited thereto, for example, made of engineering plastic sheets; in addition, in the foregoing embodiments, the sheets 5, 6 and 7 are single. The sheet is made, but the invention is not limited thereto. For example, it may be made by bonding a plurality of sheets of the same material or different materials.

As described above, the gusset of the present invention and the curved elastic structure of the gusset formed by the plate of the present invention can simultaneously increase the elastic deformation coefficient by using the fixed end and the support structure formed by the free end, and can be supported by the fixed end only. The formed structure provides a higher and more stable clamping force, so that it can be effectively attached to the object; and the curved elastic structure also uses the supporting structure to improve the fatigue resistance, so that the set angle of the present invention can be used multiple times. . In addition, the portion of the curved elastic piece that is in contact with the object is an intermediate portion thereof. If the object has a non-flat surface structure at the corner thereof, the curved elastic piece structure and the structure are also allowed to have a certain degree of clamping action.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

1, 3, 4. . . Socket

2. . . object

5, 6, 7. . . Plate

12. . . Ontology

14, 15, 34. . . First curved elastic structure

16. . . Second curved shrapnel structure

52. . . Roof section

54, 64. . . First shrapnel

74. . . Second shrapnel

56. . . Bottom plate

58. . . First side plate

60. . . Second side plate

62. . . Third side plate

twenty two. . . angle

twenty four. . . structure

122. . . Housing space

124. . . Opening

126, 132. . . edge

128, 130. . . Inner wall

142, 542, 642. . . First fixed end

144, 544. . . First free end

146, 147, 166. . . Bending section

162, 742. . . Second fixed end

164, 744. . . Second free end

522. . . First side

524. . . Second side

526. . . Fifth side

546. . . Polyline

562. . . Third side

564. . . Fourth side

F1, F2. . . elastic force

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of a set of corners in accordance with a preferred embodiment of the present invention.

Fig. 2 is a cross-sectional view taken along line X-X of the hem angle in Fig. 1.

Figure 3 is a cross-sectional view of the corner of the article on the gusset in Figure 1.

Figure 4 is a cross-sectional view of a set of corners prior to insertion of an object in accordance with another embodiment.

Figure 5 is a schematic illustration of a set of corners in accordance with another embodiment.

Figure 6 is a schematic illustration of a set of corners in accordance with another preferred embodiment of the present invention.

Figure 7 is a cross-sectional view of the yoke along line Y-Y in Figure 6.

Figure 8 is a cross-sectional view of the corner of the article on the gusset in Figure 6.

Figure 9 is a cross-sectional view of the other embodiment of the set of angles in Figure 6.

Figure 10 is a schematic illustration of a sheet material in accordance with a preferred embodiment of the present invention.

Figure 11 is a schematic illustration of a sheet material in accordance with another embodiment.

Figure 12 is a schematic illustration of a sheet material in accordance with another embodiment.

Figure 13 is a schematic illustration of a sheet material in accordance with another preferred embodiment.

2. . . object

4. . . Socket

12. . . Ontology

14. . . First curved elastic structure

16. . . Second curved shrapnel structure

twenty two. . . angle

122. . . Housing space

124. . . Opening

126, 132. . . edge

128, 130. . . Inner wall

142. . . First fixed end

144. . . First free end

146, 166. . . Bending section

162. . . Second fixed end

164. . . Second free end

F1, F2. . . elastic force

Claims (19)

a sleeve for covering a corner of an object, the sleeve includes: a body having an accommodating space and an opening connecting the accommodating space; and a first bending elastic structure disposed in the accommodating space Having a first fixed end portion and a first free end portion, the first fixed end portion is fixed to the body, wherein when the corner of the object is inserted into the accommodating space through the opening, the angle is pressed The first curved elastic piece structure is configured such that the first free end portion can slide on the inner wall of the accommodating space to elastically deform the first curved elastic piece structure, and the deformed first curved elastic piece structure applies an elastic force to the angle. The gusset of claim 1, wherein the body has an edge at the opening, and the first curved lamella structure is formed to extend from the edge. The gusset of claim 2, wherein the first curved elastic structure has a bent portion between the first fixed end and the first free end. The gusset of claim 3, wherein the bent portion is a fold line. The gusset of claim 2, wherein the length of the first curved lamella structure connecting the edge is less than the length of the edge. The gusset of claim 1, further comprising a second curved elastic structure disposed in the accommodating space and having a second fixed end and a second free end, the second fixed end being fixed to On the body, wherein the corner of the object is inserted into the accommodating space, the angle presses the second curved elastic structure, so that the second free end slides on the inner wall of the accommodating space to make the second The curved elastic structure is elastically deformed, and the deformed second curved elastic structure applies an elastic force to the corner. The gusset of claim 6, wherein the second curved lamella structure is disposed opposite the first curved lamella structure. The gusset of claim 6, wherein the first curved elastic structure contacts the second curved elastic structure before the corner is inserted into the accommodating space. The gusset as claimed in claim 1 is made of a paper material. The gusset according to claim 1, wherein the accommodating space has a triangular column shape. a sheet for folding into a set of corners, the sheet comprising: a top plate portion having a first side edge and a second side edge; a first elastic plate portion having a first fixed end portion and a first free edge An end portion, the first fixed end portion is connected to the top plate portion; a bottom plate portion having a third side edge and a fourth side edge; a first side plate portion connecting the first side edge and the third side edge; And a second side plate portion connected to the second side edge or the fourth side edge opposite to the first side plate portion; wherein the first elastic plate portion is bent to form a first curved elastic piece structure and the first first The free end portion is slidable on the top plate portion, and the top plate portion and the bottom plate portion are bent relative to the first side plate portion, and the second side plate portion is bent relative to the top plate portion or the bottom plate portion to connect the second side Forming an accommodating space and opening an opening of the accommodating space, the first curved elastic structure is located in the accommodating space, and a corner of an object is inserted into the accommodating space through the opening And pressing the first curved elastic structure to make the first bending Elastically deformable sheet structure, applying a first bending deformation of the elastic sheet structure is an elastic force to the angle. The sheet material according to claim 11, wherein the top plate portion has a fifth side edge formed at one edge of the opening, the first fixed end portion connecting the fifth side edge. The sheet of claim 12, wherein the first shrapnel portion has a fold line, and the first shrapnel portion is bent relative to the fold line to form the first curved shrapnel structure. The sheet of claim 12, wherein the length of the first fixed end joining the fifth side is less than the length of the fifth side. The plate of claim 11, further comprising a second elastic plate portion having a second fixed end portion and a second free end portion, the second fixed end portion connecting the bottom plate portion, the second elastic plate portion Bending to form a second curved elastic structure and enabling the second free end to slide on the bottom plate portion, the angle pressing the second curved elastic structure when the angle is inserted into the receiving space via the opening The second curved elastic structure is elastically deformed, and the deformed second curved elastic structure applies an elastic force to the corner. The sheet of claim 15, wherein the first curved elastic structure contacts the second curved elastic structure before the corner is inserted into the accommodating space. The sheet material as claimed in claim 11 is made of a paper material. The sheet material according to claim 11, wherein the accommodating space has a triangular column shape. The plate of claim 11, further comprising a third side plate portion connected to one of the second side edge and the fourth side edge, the third side plate portion being connected to the second side One of the sides and the fourth side, wherein the second side plate portion can overlap with the third side plate portion to form the receiving space.