Sucking disc with elastic colloid

Abstract

The suction cup comprises an elastic framework, a connecting part is arranged on the upper portion of the framework, the framework is coated with the elastic colloid, an adsorption cavity with the deep middle and the shallow periphery is formed in the lower surface of the elastic colloid, and the framework can be extruded by the connecting part so that the elastic colloid can be adsorbed to a base face. The middle part of the adsorption cavity is a top surface, the edge of the top surface gradually expands outwards to form a side wall of the adsorption cavity, and a combination part is formed between the top surface and the side wall; a first edge part surrounds one end, far away from the top surface, of the side wall, the bottom surface of the first edge part inclines towards the upper surface of the elastic colloid, and a first turning line is formed between the first edge part and the side wall. The sucker with the elastic rubber body is tightly connected with the base surface, the rubber body cannot be wrinkled or turned, and the sucker body can still keep high adsorption capacity after being used for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of daily necessities, in particular to a sucker with an elastic colloid. Background Art

[0002] Suckers are often used in people's daily lives. Due to their convenient use, they only need to be adsorbed on the base surfaces such as walls and object surfaces, without the need to drill holes in the wall, so they are widely used. A sucker is a household item that is fixed on the base surface by directly utilizing the pressure difference between the inside and outside by fitting with the base surface and forming a vacuum cavity in the middle. It is usually adsorbed on the wall surface, cabinet surface, etc. to hang items, and has the characteristics of convenient fixation and flexible displacement.

[0003] Most of the current suckers are of a vacuum adsorption structure. A flexible material such as a soft glue with a bowl-shaped overall structure that is deep in the middle and shallow around is provided on the sucker. The disc body is closely attached to the base surface or the surface of the item, and the sucker is pressed to flatten and deform the disc body to be attached to the base surface so that the air between the disc body and the base surface is discharged, thereby enabling the disc body to be adsorbed on the base surface. However, the edge of the existing sucker is relatively thin and forms an outwardly protruding bevel angle. In this way, after the sucker is adsorbed on the wall and bears a load, the lower side of the sucker is subjected to relatively greater force, which causes extrusion on the lower side edge of the sucker. Since the edge of the sucker is relatively thin and the supporting force is insufficient, the problem of curling or warping of the lower side edge of the sucker is very likely to occur, thereby causing air leakage in the vacuum cavity of the sucker and making the sucker unable to maintain a long-term adsorption force. Content of the Utility Model

[0004] The purpose of the utility model is to provide a sucker with an elastic colloid. The sucker with an elastic colloid is closely connected to the base surface, the colloid will not wrinkle, curl or warp, and the disc body will still maintain a strong adsorption capacity after long-term use.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A sucker with an elastic colloid includes a skeleton. A connecting part is provided on the upper part of the skeleton. An elastic colloid is coated on the skeleton. The lower surface of the elastic colloid forms an adsorption cavity that is deep in the middle and shallow around. The connecting part can extrude the skeleton so that the elastic colloid is adsorbed on the base surface. The middle part of the adsorption cavity is the top surface. The edge of the top surface gradually extends outward and downward to form the side wall of the adsorption cavity. A joint part is formed between the top surface and the side wall; at one end of the side wall far from the top surface, a first edge part is provided. The bottom surface of the first edge part inclines towards the upper surface of the elastic colloid. A first turning line is formed between the first edge part and the side wall.

[0007] Preferably, the range of the angle α between the first edge part and the base surface is 1°≤α≤74°.

[0008] Preferably, the joint part is a second turning line or an arc transition surface formed between the top surface and the side wall of the adsorption cavity; the top surface is a plane or an arc surface.

[0009] Preferably, the included angle β between the side wall and the base surface ranges from 5° ≤ β ≤ 20°; the width of the side wall is d1, and the width of the first edge part is d2, where 0.01 ≤ d2 / d1 ≤ 0.3.

[0010] Preferably, the included angle α between the first edge part and the base surface ranges from 10° ≤ α ≤ 68°.

[0011] Preferably, the side part of the lower surface of the elastic colloid is formed by splicing a plurality of first inclined surfaces, and an arc transition connection is formed between adjacent first inclined surfaces to form the side wall.

[0012] Preferably, the first edge part surrounds the periphery of the side wall, and the first edge part intersects with the upper surface of the elastic colloid.

[0013] Preferably, the first edge part surrounds the periphery of the side wall, and a thickened layer is formed between the first edge part and the upper surface of the elastic colloid.

[0014] Preferably, the included angle α between the first edge part and the base surface ranges from 20° ≤ α ≤ 58°.

[0015] Preferably, the skeleton is in a bowl shape with a middle part higher than the surrounding parts. An annular protrusion and several strip-shaped protrusions are provided at the outer edge of the skeleton. The strip-shaped protrusions are circumferentially arranged on the skeleton, and the annular protrusion penetrates through the strip-shaped protrusions; several strip-shaped slits are also provided at the edge of the skeleton.

[0016] Preferably, strip-shaped holes are further provided on the skeleton. The strip-shaped holes are located between the connecting part and the annular protrusion, and the strip-shaped holes are circumferentially arranged on the skeleton.

[0017] Preferably, a receiving part is further included. The receiving part is connected to the connecting part by snap connection or screw connection; a convex platform is provided in the middle of the skeleton. The lower surface of the convex platform is a plane or an arc surface; the connecting part is arranged on the upper surface of the convex platform.

[0018] Preferably, the connecting part is a hollow protrusion, and a snap connection edge is provided on the protrusion; the receiving part covers the upper surface of the elastic colloid; a snap connection groove is provided inside the receiving part, and the snap connection groove is snap-connected to the connecting part and presses the skeleton so that the elastic colloid adsorbs on the base surface.

[0019] Preferably, the skeleton is formed by splicing a plurality of second inclined surfaces that incline towards the middle of the skeleton, and a smooth transition is formed between the second inclined surfaces to form a bowl-shaped skeleton.

[0020] Preferably, the receiving member is further provided with a hanging portion for connecting with an external object, and the hanging portion is any one of a hook, a card slot or a screw.

[0021] Preferably, the range of the angle α between the first edge portion and the base surface is 30° ≤ α ≤ 50°.

[0022] Preferably, the width of the side wall is d1, and the width of the first edge portion is d2, 0.05 ≤ d2 / d1 ≤ 0.15.

[0023] Preferably, the thickness between the upper surface and the lower surface of the elastic colloid is 2.5 mm - 5.5 mm.

[0024] In the above technical solution, the lower surface of the elastic colloid forms an adsorption cavity that is deep in the middle and shallow around. The upper part of the adsorption cavity is provided with a top surface. The edge of the top surface gradually expands outward and downward to form the side wall of the adsorption cavity. A first edge portion is surrounded at one end of the side wall far from the top surface. The bottom surface of the first edge portion inclines towards the upper surface of the elastic colloid, and a first turning line is formed between the first edge portion and the side wall. The plane where the first turning line is located is parallel to the base surface. In this way, before the suction cup adsorbs on the base surface, the first turning line can fit on the base surface. Then, the elastic colloid is extruded to discharge the air in the adsorption cavity, so as to adsorb the elastic colloid on the base surface. At this time, the skeleton and the elastic colloid have a contraction force to restore the deformation, which will squeeze the side wall to approach and fit on the base surface, so that the elastic colloid is adsorbed on the base surface more tightly. After the suction cup hangs an object, compared with the problem that the lower side edge of the suction cup in the prior art is relatively stressed and the edge curls or warps after the suction cup adsorbs and fits on the base surface, in this application, the first edge portion can prevent the outer edge of the side wall of the adsorption cavity from curling. At the same time, the outer edge of the first edge portion can be attached to the base surface under the action of the gravity of the heavy object, and the thickened layer or the upper surface of the elastic colloid provides sufficient supporting tensile force for the first edge portion to prevent the outer edge of the first edge portion from curling inward and warping, so as to ensure that the suction cup still has a strong adsorption capacity after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is an exploded structural schematic diagram of the present utility model;

[0026] Figure 2 is a three-dimensional structural schematic diagram of the elastic colloid of the present utility model;

[0027] Figure 3 is a three-dimensional structural schematic diagram of the skeleton of the present utility model;

[0028] Figure 4 is a three-dimensional structural schematic diagram of the skeleton of the present utility model from another angle;

[0029] Figure 5 is a three-dimensional structural schematic diagram of the receiving member of the present utility model;

[0030] Figure 6 is a three-dimensional structural schematic diagram of the present utility model;

[0031] Figure 7 is a schematic diagram of the sectional structure of the present utility model;

[0032] Figure 8 is a structural schematic diagram of the comparative example of the present utility model.

[0033] In the figure, 1 is the skeleton; 2 is the connecting part; 21 is the clamping edge; 3 is the elastic colloid; 4 is the adsorption cavity; 5 is the base surface; 6 is the side wall; 7 is the top surface; 8 is the bonding part; 9 is the first edge part; 10 is the first folding line; 11 is the first inclined surface; 12 is the annular protrusion; 13 is the strip-shaped protrusion; 14 is the strip-shaped slot; 15 is the strip-shaped hole; 16 is the second inclined surface; 17 is the boss; 18 is the receiving part; 19 is the clamping groove; 22 is the downward extension part; 23 is the card slot; 24 is the thickened layer. Specific embodiments

[0034] The following further describes the present utility model in conjunction with the accompanying drawings:

[0035] As Figures 1 to 8As shown, a suction cup with elastic colloid includes an elastic skeleton 1, a connecting portion 2 is provided on the upper part of the skeleton 1, and an elastic colloid 3 is coated on the skeleton 1. The thickness d3 between the upper surface and the lower surface of the elastic colloid is 2.5 mm-5.5 mm. For example, the thickness d3 between the upper surface and the lower surface can be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 4.0 mm, 4.1 mm, 4.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, etc. The lower surface of the elastic colloid 3 forms an adsorption cavity 4 which is deep in the middle and shallow around. The connecting portion 2 can squeeze the skeleton 1 so that the elastic colloid 3 is adsorbed on the base surface 5. The upper part of the adsorption cavity 4 is provided with a top surface 7, which is a plane or concave inward or convex outward. Preferably, the top surface 7 is a plane parallel to the base surface 5 or the top surface 7 is an arc surface; the top surface 7 gradually expands outward from top to bottom to form a side wall 6 of the adsorption cavity, and a joint portion 8 is formed between the top surface 7 and the side wall 6. The joint portion 8 is a second turning line or arc transition surface formed between the top surface 7 and the side wall 6; at the side wall 6 away from the top surface 7 One end is surrounded by a first edge portion 9, the bottom surface of the first edge portion 9 is inclined toward the upper surface of the elastic colloid 3, and a first turning line 10 is formed between the first edge portion 9 and the side wall 6, and the first turning line 10 is attached to the base surface 5, and then the elastic colloid 3 is squeezed through the connection portion 2 to discharge the air in the adsorption chamber 4, so that the elastic colloid 3 is adsorbed on the base surface 5. At this time, the skeleton 1 and the elastic colloid 3 have a contraction force to restore the deformation, which will squeeze the side wall 6 to move closer to the base surface 5 and fit on the base surface 5, so that the elastic colloid 3 is tightly adsorbed on the base surface 5. After the suction cup hangs an object, the first edge portion 9 can prevent the outer edge of the side wall 6 from curling, and at the same time, the outer edge of the first edge portion 9 will be closer to the base surface 5 under the downward squeezing force, and the thickened layer will pull and prevent the outer edge of the first edge portion 9 from curling inward, thereby ensuring that the suction cup will still maintain a strong adsorption capacity after long-term use.

[0036] The range of the angle α between the first edge portion 9 and the base surface 5 is 1° ≤ α ≤ 74°, such as the angle α can be 1.0°, 2.0°, 2.2°, 3.0°, 3.5°, 4.0°, 5.5°, 6.8°, 7.2°, 8.4°, 9.5°, 10.0°, 12.5°, 15.2°, 16.7°, 17.3°, 20.0°, 27.5°, 28.5°, 29.0°, 30.0°, 31.2°, 34.0°, 40.0°, 41.0°, 42.4°, 43.0°, 44.5°, 49.0°, 50.0°, 52.0°, 55.6°, 58.0°, 60.0°, 62.0°, 68.0°, 74.0°, etc.; the range of the angle β between the side wall 6 and the base surface 5 is 5° ≤ β ≤ 20°, such as the angle β can be 5.0°, 5.1°, 6.2°, 7.0°, 7.2°, 8.0°, 8.4°, 9.5°, 10.6°, 11.0°, 12.5°, 13.5°, 14.0°, 15.0°, 16°, 16.7°, 17.3°, 18.0°, 18.5°, 19.0°, 20.0°, etc.; the width of the side wall 6 is d1, and the width of the first edge portion 9 is d2, 0.01 ≤ d2 / d1 ≤ 0.3, that is, d2 / d1 can be any value among 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.28, 0.29, 0.30.

[0037] In a preferred case, the side portion of the lower surface of the elastic colloid 3 is formed by splicing a plurality of first inclined surfaces 11. Preferably, there are 4 first inclined surfaces 11. The adjacent first inclined surfaces 11 are connected by an arc transition to form the side wall 6, which can make the elastic colloid 3 fit more closely with the base surface 5 and make the air in the adsorption cavity 4 discharged more thoroughly. The outer edge of the lower surface of the elastic colloid 3 is cut obliquely upward to form the first edge portion 9.

[0038] In a preferred case, the first edge portion 9 surrounds the periphery of the side wall 6, and the first edge portion 9 intersects with the upper surface of the elastic colloid. The upper surface of the elastic colloid provides sufficient supporting tensile force for the first edge portion 9 to prevent the outer edge of the first edge portion 9 from curling and warping inward.

[0039] In another embodiment, the first edge portion 9 surrounds the periphery of the side wall 6, and a thickening layer 24 is formed between the first edge portion 9 and the upper surface of the elastic colloid. The thickening layer 24 can provide a more stable supporting tensile force to ensure that the suction cup still maintains a strong adsorption capacity after long-term use.

[0040] Such as Figures 3 to 4As shown, the framework 1 is in the shape of a bowl with a higher middle part and lower peripheral parts. An annular protrusion 12 and a number of strip-shaped protrusions 13 are provided at the outer edge of the framework 1. The strip-shaped protrusions 13 are circumferentially and evenly arranged on the framework. The strip-shaped protrusions 13 can extend radially or be in the shape of an arc bent in the same direction; the annular protrusion 12 penetrates and connects the strip-shaped protrusions 13, enhancing the strength of the framework 1, and at the same time can strengthen the connection relationship between the elastic colloid 3 and the framework 1 to prevent the elastic colloid 3 from falling off the framework 1. A number of strip-shaped slits 14 are provided at the edge of the framework 1. The strip-shaped slits 14 can extend radially or be in the shape of an arc bent in the same direction; the strip-shaped slits 14 are circumferentially and evenly arranged at the edge of the framework 1. A strip-shaped hole 15 is also provided on the framework 1. The strip-shaped hole 15 is located between the connecting part 2 and the annular protrusion 12, and the strip-shaped holes 15 are circumferentially and evenly arranged on the framework. The strip-shaped hole 15 can extend radially or be in the shape of an arc bent in the same direction; the settings of the strip-shaped slits 14 and the strip-shaped holes 15 make it more convenient and labor-saving for the framework 1 to deform. Further, the width of the strip-shaped hole 15 at the end close to the connecting part 2 is greater than the width of the strip-shaped hole 15 at the end close to the annular protrusion 13.

[0041] In a preferred embodiment, the framework 1 is formed by splicing a number of second inclined surfaces 16 that incline towards the middle of the framework 1. The second inclined surfaces 16 are smoothly transitioned to form the bowl-shaped framework 1. A boss 17 is provided in the middle of the framework 1. The second inclined surfaces 16 surround the boss 17 and are connected to the boss 17. And the lower surface of the boss 17 is a plane or is concave or convex inward. Preferably, the lower surface of the boss 17 is parallel to the base surface 5 or the lower surface of the boss 17 is an arc surface. The connecting part 2 is arranged on the upper surface of the boss 17. In a preferred embodiment, a receiving part 18 is further included. The receiving part 18 is connected to the connecting part 2 by snap connection or screw connection or plug connection. In one embodiment, the connecting part 2 is a hollow protrusion. A snap edge 21 is provided on the protrusion. The snap edge 21 is arranged on the opposite sides of the protrusion along the length direction of the protrusion. A guiding slope is provided on the outer edge of the upper surface of the snap edge 21 to facilitate connection with the snap groove 19; the receiving part 18 covers the upper surface of the elastic colloid 3. When the sucker adsorbs, the side wall of the receiving part 18 presses against the edge of the upper surface of the elastic colloid 3 to prevent the framework or the elastic colloid from recovering deformation and shrinking back, causing air leakage in the adsorption cavity and affecting the adsorption effect of the sucker; it can also be that the receiving part 18 is separately provided with a pressing edge for pressing against the outer edge of the sucker; a snap groove 19 matching the protrusion is provided inside the receiving part 18. A limiting edge is provided on the side wall of the snap groove 19. The snap groove 19 is inserted into the protrusion. The protrusion deforms so that the snap edge 21 reaches the limiting edge after passing through the snap groove 19. At this time, the protrusion recovers deformation so that the snap edge 21 is snap-fixed on the limiting edge, fixing the receiving part 18 on the connecting part 2. The receiving part 18 presses the elastic colloid 3 to adsorb on the base surface 5.

[0042] In a preferred embodiment, the receiving member 19 is further provided with a hanging portion for connecting to an external article, and the hanging portion is any one of a hook, a card slot or a screw. In this embodiment, a downward extension portion 22 is provided on the outer side wall of the receiving member 19, and a card slot 23 for connecting to an external article is provided at the end of the downward extension portion, which is convenient for snap - connection or hanging connection with an external article.

[0043] When using the suction cup, place the suction cup on the base surface 5. The first folding line 10 on the bottom surface of the elastic colloid 3 is attached to the base surface 5. Then press the receiving member 19 to install it on the connecting portion 2. The receiving member 19 presses against the elastic colloid 3 and the framework 1, causing the framework 1 and the elastic colloid 3 to deform, exhausting the air in the adsorption cavity 4. After removing the external pressing force, the framework 1 and the elastic colloid 3 rebound, and the bottom of the elastic colloid 3 is pulled upward to form a vacuum cavity, thereby enabling the suction cup to adsorb on the base surface 5.

[0044] Test: Use four specific products with the structure of this embodiment as examples for the endurance test. Use a suction cup ( Figure 8 the suction cup shown) that transitions from the upper surface of the disc body to the lower surface of the disc body and has no first edge portion as a comparative example. The specific measured data is as follows:

[0045] Table 1 Measured data of the products of the comparative example and Examples 1 - 4

[0046]

[0047] In Table 1, α is the angle between the first edge portion 9 and the base surface 5; β is the angle between the conical surface 6 and the base surface 5; d1 is the width of the conical surface 6; d2 is the width of the first edge portion 9; d3 is the thickness between the upper surface and the lower surface of the elastic colloid.

[0048] Attach the suction cup samples of the comparative example and the examples to a vertical wall surface, then hang a 15 - kg heavy object on the suction cup, test for 30 minutes, and record the state change of the elastic colloid of the five suction cups.

[0049] Table 2 Test data of the suction cups of the comparative example and Examples 1 - 4

[0050]

[0051] In summary, under the pressure of the hanging heavy object, the state of the elastic colloid of Products 1 - 4 is not easily squeezed and wrinkled to cause curling, so that the suction cup maintains a strong adsorption force.

[0052] This embodiment is only an illustration of the concept and implementation of the present utility model, and does not limit it. Under the concept of the present utility model, technical solutions without substantial transformation are still within the protection scope.

Claims

1. A suction cup with an elastic colloid, comprising a framework. A connecting portion is provided on the upper part of the framework. An elastic colloid is coated on the framework. An adsorption cavity with a deep middle and shallow periphery is formed on the lower surface of the elastic colloid. The connecting portion can squeeze the framework so that the elastic colloid adsorbs on a base surface, and is characterized in that, The middle part of the adsorption cavity is the top surface, and the edge of the top surface gradually extends outward and downward to form the side wall of the adsorption cavity. A joint is formed between the top surface and the side wall. At one end of the side wall away from the top surface, there is a first edge part, and the bottom surface of the first edge part inclines towards the upper surface of the elastic colloid. A first turning line is formed between the first edge part and the side wall.

2. The suction cup with an elastic colloid as described in claim 1, wherein The range of the angle α between the first edge part and the base surface is 1° ≤ α ≤ 74°.

3. The suction cup with an elastic colloid according to claim 1 or 2, characterized in that, The joint is a second turning line or an arc transition surface formed between the top surface and the side wall of the adsorption cavity; the top surface is a plane or the top surface is an arc surface.

4. The suction cup with an elastic colloid according to claim 3, characterized in that, The range of the angle β between the side wall and the base surface is 5° ≤ β ≤ 20°; the width of the side wall is d1, and the width of the first edge part is d2, 0.01 ≤ d2 / d1 ≤ 0.

3.

5. The suction cup with an elastic colloid as described in claim 1, wherein The range of the angle α between the first edge part and the base surface is 10° ≤ α ≤ 68°.

6. The suction cup with an elastic colloid as described in claim 4, characterized in that, The side part of the lower surface of the elastic colloid is formed by splicing a plurality of first inclined surfaces, and the adjacent first inclined surfaces are connected by arc transition to form the side wall.

7. The suction cup with an elastic colloid according to claim 6, characterized in that, The first edge part surrounds the periphery of the side wall, and the first edge part intersects with the upper surface of the elastic colloid.

8. The sucker with an elastic colloid as described in claim 6, characterized in that, The first edge part surrounds the periphery of the side wall, and a thickened layer is formed between the first edge part and the upper surface of the elastic colloid.

9. The suction cup with an elastic colloid according to claim 7 or 8, characterized in that, The range of the angle α between the first edge part and the base surface is 20° ≤ α ≤ 58°.

10. The sucking disc with an elastic colloid according to any one of claims 1, 2, 4 to 8, characterized in that, The framework is in the shape of a bowl with a middle high and a surrounding low. An annular protrusion and several strip-shaped protrusions are arranged at the outer edge of the framework. The strip-shaped protrusions are arranged circumferentially on the framework, and the annular protrusion penetrates the strip-shaped protrusions; several strip-shaped slits are also arranged at the edge of the framework.

11. The suction cup with an elastic colloid as described in claim 10, wherein Several strip-shaped holes are also arranged on the framework. The strip-shaped holes are located between the connecting part and the annular protrusion, and the strip-shaped holes are arranged circumferentially on the framework.

12. The sucking disc with an elastic colloid as claimed in claim 1 or 11, wherein, It further includes a receiving part, and the receiving part is connected to the connecting part by snap connection or screw connection; a convex platform is arranged in the middle of the framework, and the lower surface of the convex platform is a plane or the lower surface of the convex platform is an arc surface; the connecting part is arranged on the upper surface of the convex platform.

13. The suction cup with an elastic colloid as described in claim 12, wherein, The connecting part is a hollow protrusion, and a snap edge is arranged on the protrusion; the receiving part covers the upper surface of the elastic colloid; a snap groove is arranged inside the receiving part, and the snap groove is snap-connected to the connecting part and presses the framework so that the elastic colloid adsorbs on the base surface.

14. The suction cup with an elastic colloid as claimed in claim 1 or 13, wherein The framework is formed by splicing several second inclined surfaces that incline towards the middle of the framework, and the second inclined surfaces are smoothly transitioned to form a bowl-shaped framework.

15. The suction cup with an elastic colloid according to claim 12 or 13, characterized in that, A hanging part for connecting with an external article is also arranged on the receiving part, and the hanging part is any one of a hook, a clamping groove or a screw.

16. The suction cup with an elastic colloid as described in claim 13, characterized in that, The range of the angle α between the first edge part and the base surface is 30° ≤ α ≤ 50°.

17. The suction cup with an elastic colloid as described in claim 16, characterized in that, The width of the side wall is d1, and the width of the first edge part is d2, 0.05 ≤ d2 / d1 ≤ 0.

15.

18. The suction cup with an elastic colloid according to any one of claims 1, 2, 4 to 8, and 17, characterized in that, The thickness between the upper surface and the lower surface of the elastic colloid is 2.5 mm - 5.5 mm.

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