CN213899581U - Brush and rotating shaft structure thereof - Google Patents

Abstract

The utility model provides a pivot structure contains outer body, a plurality of interior body and reinforcement structure. The outer tube body has an outer surface and an inner surface. The inner pipe body is provided with an outer surface and an inner surface respectively, the inner pipe body is fixedly arranged in the outer pipe body, and the outer surface of the inner pipe body is attached to the inner surface of the outer pipe body. The reinforcing structure is arranged on the inner surface of the at least one inner tube body in a protruding mode. Therefore, the structural strength is enhanced by arranging the inner pipes in the outer pipe. The utility model also provides a brush tool containing the rotating shaft structure.

Description

Brush and rotating shaft structure thereof

Technical Field

The present invention relates to a brush and a pivot structure thereof, and more particularly to a brush for cleaning a liquid crystal panel or a glass substrate used for manufacturing a liquid crystal panel and a pivot structure thereof.

Background

In the process of manufacturing the liquid crystal panel from the glass substrate, the glass substrate must undergo a plurality of processing steps and may be contaminated with sealant, dust or rolling marks (Roller marks), and therefore, the glass substrate must be cleaned by a brushing tool before entering another step or before the liquid crystal panel leaves a factory.

The glass substrate for forming the liquid crystal panel is cut from a large piece of glass. With the advance of the digital technology, thin and light film displays have become the mainstream, and thus, the thickness of the glass substrate for fabricating the liquid crystal panel is getting smaller and smaller. In terms of the use requirements, as the demands of users for the size of the visual interface increase, the demands for large-sized liquid crystal panels also increase, so that the size of the glass substrate can be increased to cut larger and more panels, thereby achieving the purposes of reducing the cost and increasing the economic benefits. It is seen that the size and thickness of the glass substrate are increasingly larger and thinner, which also increases the technical threshold of manufacturing, transporting and cleaning such glass substrates.

As the sizes of the glass substrate and the liquid crystal panel become larger, the brushes required for cleaning the glass substrate and the liquid crystal panel must be improved. The conventional brushes for cleaning the surface of the glass substrate or the liquid crystal panel are made of stainless steel, however, the specific gravity of the stainless steel is high, so that when the length of the rotating shaft of the brush is increased, the center and the two ends of the brush may not be located on the same straight line, and when the brush is rotated and brushed, the brushing force is not uniform. In addition, when the brush is rotated at a high speed, eccentric vibration may occur due to bending deformation of the rotating shaft, resulting in a possibility of generating a large noise during brushing and a large abrasion of the rotating shaft.

In summary, the conventional brush for cleaning the liquid crystal panel or the large-sized glass substrate and the rotating shaft thereof have problems of uneven brushing force and vibration and noise easily generated during high-speed rotation.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present invention is to provide a rotating shaft structure, which can improve the stability of the brush.

To achieve the above object, the present invention provides a hinge structure, which comprises:

an outer tube having an outer surface and an inner surface;

the inner tubes are respectively provided with an outer surface and an inner surface, the inner tubes are fixedly arranged in the outer tube, and the outer surfaces of the inner tubes are respectively attached to the inner surface of the outer tube; and

a reinforcing structure, which is arranged on the inner surface of at least one inner tube body in a protruding way.

In the above-mentioned rotating shaft structure, the outer tube has an outer tube length along an axial direction, the plurality of inner tubes have an inner tube length along the axial direction, and the inner tube lengths of the plurality of inner tubes are smaller than the outer tube length.

In the above rotating shaft structure, a total length of the inner tubes of the plurality of inner tubes is at least 50% of a length of the outer tube.

In the above rotating shaft structure, the lengths of the inner tubes of the plurality of inner tubes are different.

The rotating shaft structure described above, wherein the lengths of the inner tubes of the plurality of inner tubes are the same.

In the above rotating shaft structure, the inner pipes are connected with each other.

In the above rotating shaft structure, the plurality of inner tubes have a gap in the axial direction.

In the above-mentioned rotating shaft structure, the length of the inner tube body close to the two ends of the outer tube body in the axial direction is smaller than the length of the inner tube body far from the two ends of the outer tube body in the axial direction.

In the above-mentioned rotating shaft structure, the reinforcing structure extends along the axial direction.

In the above-mentioned rotating shaft structure, the length of the reinforcing structure extending along the axial direction is equal to the length of the inner pipe body.

In the above-mentioned rotating shaft structure, the length of the reinforcing structure extending along the axial direction is less than the length of the inner pipe body.

In the above-mentioned rotating shaft structure, the reinforcing structure extends in a ring shape around the axial direction.

In the above-mentioned rotating shaft structure, the reinforcing structure extends spirally around the axial direction.

To achieve the above object, the present invention further provides a brush, which comprises a brush body and the rotating shaft structure, wherein the brush body is disposed on the outer surface of the outer tube body of the rotating shaft structure.

Therefore, the plurality of inner tubes are arranged in the outer tube to reinforce the structural strength and improve the resilience rate.

The utility model discloses another provide a brush utensil that contains aforementioned pivot structure, and the brush body sets up in the surface of the outer body of pivot structure. Therefore, the brush can be supported by the rotating shaft structure with enhanced structural strength, and the use stability of the brush is improved.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

Drawings

Fig. 1 is a schematic view (a) of a rotating shaft structure according to a first embodiment of the present invention;

fig. 2 is a schematic view (ii) of a rotating shaft structure according to a first embodiment of the present invention;

fig. 3 is a sectional view of a rotating shaft structure according to a first embodiment of the present invention;

fig. 4 is a schematic view of a rotating shaft structure according to a second embodiment of the present invention;

fig. 5 is a schematic view of a rotating shaft structure according to a third embodiment of the present invention;

fig. 6 is a first schematic view of a rotating shaft structure according to a fourth embodiment of the present invention;

fig. 7 is a second schematic view of a rotating shaft structure according to a fourth embodiment of the present invention;

fig. 8 is a schematic view of a rotating shaft structure according to a fifth embodiment of the present invention;

fig. 9 is a schematic view of a rotating shaft structure according to a sixth embodiment of the present invention;

fig. 10 is a schematic view of a rotating shaft structure according to a seventh embodiment of the present invention;

fig. 11 is a schematic view of a rotating shaft structure according to an eighth embodiment of the present invention;

fig. 12 is a schematic view of a rotating shaft structure according to a ninth embodiment of the present invention;

fig. 13 is a sectional view of a rotating shaft structure according to a tenth embodiment of the present invention;

fig. 14 is a sectional view of a rotating shaft structure according to an eleventh embodiment of the present invention;

fig. 15 is a sectional view of a rotating shaft structure according to a twelfth embodiment of the present invention;

fig. 16 is a schematic view (one) of a rotating shaft structure according to a thirteenth embodiment of the present invention;

fig. 17 is a schematic view (ii) of a rotating shaft structure according to a thirteenth embodiment of the present invention;

fig. 18 is a sectional view of a rotating shaft structure according to a thirteenth embodiment of the present invention;

fig. 19 is a schematic structural view of the brush of the present invention.

Wherein the reference numerals

10 outer tube body

11 outer surface of

12 inner surface

20, inner tube body

21 outer surface

22 inner surface

30 reinforcing structure

40, adhesive

50: brush body

L1 outer tube Length

L2 inner tube Length

X is axial direction

Y is radial

Detailed Description

The following describes the structural and operational principles of the present invention in detail with reference to the accompanying drawings:

referring to fig. 1 to 3, fig. 1 is a schematic view (a) of a rotating shaft structure according to a first embodiment of the present invention. Fig. 2 is a schematic view (ii) of a rotating shaft structure according to a first embodiment of the present invention. Fig. 3 is a sectional view of the rotating shaft structure according to the first embodiment of the present invention. The hinge structure shown in fig. 1 to 3 includes an outer tube 10, a plurality of inner tubes 20, and a reinforcing structure 30. The outer tube 10 has an outer surface 11 and an inner surface 12. Each inner tube 20 has an outer surface 21 and an inner surface 22, each inner tube 20 is fixed in the outer tube 10, and the outer surface 21 of each inner tube 20 is attached to the inner surface 12 of the outer tube 10. The reinforcing structure 30 is disposed on the inner surface 22 of the at least one inner tube 20.

Therefore, the length of each inner tube 20 is shortened, so that the phenomenon that the inner tube 20 is bent can be reduced, and the phenomenon that the central part of a long rotating shaft structure is drooped when only two ends of the long rotating shaft structure are fixed is avoided. Meanwhile, when the rotating shaft structure is stressed, the inner pipes 20 can share the stress and respectively generate resilience force when the stress disappears, so that the recovery speed of the whole rotating shaft structure after elastic deformation is improved, and the use stability is further improved. In addition, the outer tube 10 is supported by the inner tube 20, and the inner tube 20 is provided with the reinforcing structure 30, so that the overall rigidity of the rotating shaft structure can be improved and the service life can be prolonged.

In one embodiment, the outer tube 10 may be a hollow tube structure made of metal and extending in an axial direction. The outer tube 10 of this embodiment is made of a stainless steel material, such as 304 stainless steel. The stainless steel material is only an example, the present invention is not limited to this material, and other stainless steels such as 316 stainless steel or 430 stainless steel can be applied to the present invention.

In one embodiment, the inner tube 20 may also be a hollow tube structure made of metal or other materials and extending along the axial direction X. In this embodiment, the hardness of the material of the inner tube 20 is less than or equal to that of the outer tube 10, so that the inner tube 20 can have the ability to rebound after being stressed. In this embodiment, the inner tube 20 is made of a magnesium alloy. The inner tube 20 made of magnesium alloy is merely an example, and the present invention is not limited to this material. Other aluminum or aluminum alloys having a hardness less than or equal to the hardness of the outer tube 10 material may also be suitable for use in the present invention.

Further, in the embodiment that the inner tube 20 is made of magnesium alloy, the magnesium alloy may be an aluminum magnesium alloy, a magnesium aluminum alloy, or an alloy doped with other rare earth metals, manganese, zirconium, zinc, and the like, and the content of magnesium is not less than 50%. If the content of magnesium is less than 50%, the vibration resistance of the manufactured rotating shaft structure is poor.

In one embodiment, the specific gravity of the material of the inner tube 20 may be smaller than that of the material of the outer tube 10, thereby ensuring that the overall shaft structure can have an increased overall rigidity with a minimum increase in weight.

Referring to fig. 1, in an embodiment, the length of the outer tube 10 extending along the axial direction X is an outer tube length L1, and the length of each inner tube 20 extending along the axial direction X is an inner tube length L2, and each inner tube length L2 is smaller than the outer tube length L1. In an embodiment, the sum of the inner tube lengths L2 of all the inner tubes 20 is at least 50% of the outer tube length L1, but the present invention is not limited thereto, and the sum of all the inner tube lengths L2 may be equal to or greater than the outer tube length L1.

Referring to fig. 1 to 3, in an embodiment, the inner tube lengths L2 of the inner tubes 20 may be different from each other, in which the inner tube length L2 of the inner tube 20 that is farther from both ends of the outer tube 10 in the axial direction X is longer, and the inner tube length L2 of the inner tube 20 that is closer to both ends of the outer tube 10 in the axial direction X is shorter. Thereby, the strength of the inner tube 20 between the two ends is increased, the strength of the middle part of the outer tube 10 is increased, and the central drooping phenomenon is avoided.

Referring to fig. 4, in an embodiment, the inner tube lengths L2 of the inner tubes 20 are the same, so that the inner tubes 20 with the same length can be easily manufactured and the production efficiency can be improved.

Referring to fig. 4 and 5, in one embodiment, the inner tubes 20 are disposed in the outer tube 10 and can be connected to each other or spaced apart from each other. Specifically, the inner tube 20 may be connected to each other in such a manner that both ends of the inner tube 20 in the axial direction X are connected. The inner tubes 20 may be disposed at intervals, such that the ends of the adjacent inner tubes 20 in the axial direction X are fixed in the outer tube 10 with gaps, as shown in fig. 5.

Referring to fig. 5 to 7, in an embodiment where the inner tubes 20 are spaced apart from each other, at least one of the inner tubes 20 may be provided with a reinforcing structure 30, as shown in fig. 5. Each of the inner tubes 20 may be provided with a reinforcing structure 30, as shown in fig. 6 and 7, but the present invention is not limited thereto.

Referring to fig. 2 and 4, in one embodiment, the reinforcing structure 30 can enhance the structural strength of part or all of the inner tube 20. In this embodiment, the reinforcing structure 30 protrudes from the inner surface 22 of the inner tube 20. Specifically, the inner tube 20 has an inner tube thickness between the inner surface 22 and the outer surface 21 in the radial direction Y perpendicular to the axial direction X, and the reinforcing structure 30 is disposed on the inner surface 22 of the inner tube 20 to increase the inner tube thickness, so as to enhance the structural strength of the inner tube 20.

Further, the shape and arrangement of the reinforcing structure 30 are not particularly limited. That is, the reinforcing structure 30 may be disposed on a part or all of the inner surface 22 of the inner tube 20 according to different strength requirements or manufacturing considerations, and the cross section or extending direction of the reinforcing structure 30 may be specific or unspecified. That is, when the reinforcing structure 30 extends in the axial direction X, the length of the reinforcing structure 30 extending in the axial direction X may be less than or equal to the inner tube length L2 of the inner tube 20.

In one embodiment, the reinforcing structure 30 and the inner tube 20 are made of the same material for manufacturing convenience. For example, the metal plate is integrally formed by extrusion molding, metal injection molding or casting, but the present invention is not limited thereto. Therefore, the inner tube 20 and the reinforcing structure 30 can be manufactured in one process, and the production efficiency is improved.

In one embodiment, the reinforcing structure 30 may be manufactured separately from the inner tube 20 and then connected thereto. For example, in order to make the overall rotating shaft structure lighter, the inner tube 20 is made of metal, the reinforcing structure 30 is made of plastic, and the inner tube 20 and the reinforcing structure 30 are separately made and then connected by adhesive, so that the overall rotating shaft structure is lighter.

Referring to fig. 2 and 8, in an embodiment, the reinforcing structure 30 may be disposed on the entire axial X range or the partial axial X range of the inner surface 22 of the inner tube 20. Herein, since the number of the inner tubes 20 is plural, the rotating shaft structure shown in fig. 2 includes three inner tubes 20, and the reinforcing structure 30 is partially disposed on the inner tubes 20, specifically, two inner tubes 20 near two ends of the outer tube 10 in the axial direction X are not disposed with the reinforcing structure 30, and only the inner tube 20 between the two ends is disposed with the reinforcing structure 30. Therefore, the rotating shaft structure can be adapted to different driving structures for driving the rotating shaft center to be inserted into the two ends of the inner tube 20 of the rotating shaft structure, and the driving shaft center for driving the rotating shaft structure to rotate can be inserted into the two ends of the inner tube 20, and meanwhile, the reinforcing effect can be achieved.

Referring to fig. 8 and 9, in an embodiment in which the reinforcing structure 30 is disposed on the inner surface 22 of the inner tube 20 over the entire axial range X, the reinforcing structure 30 disposed on each inner tube 20 may be continuous or discontinuous. The reinforcing structure 30 of the rotating shaft structure shown in fig. 8 is disposed on the inner surface 22 of the inner tube 20 along the entire axial direction X and is connected continuously. The reinforcing structure 30 of the rotating shaft structure shown in fig. 9 is disposed on the inner surface 22 of the inner tube 20 along the entire axial direction X and is not connected continuously.

Referring to fig. 2 to 9, in an embodiment, in order to prevent the entire shaft structure from being bent due to the increase of the length in the axial direction X, the reinforcing structure 30 disposed on the inner surface 22 of the inner tube 20 is a long structure extending along the axial direction X, but the present invention is not limited thereto.

Referring to fig. 10, in an embodiment, the reinforcing structure 30 disposed on the inner surface 22 of the inner tube 20 is not limited to a long strip structure extending along the axial direction X, and in this embodiment, the reinforcing structure 30 may also be disposed on the inner surface 22 spirally around the axial direction X. In other embodiments, the reinforcing structure 30 may be disposed on the inner surface 22 in a circular ring shape around the axial direction X, as shown in fig. 11.

Further, in another embodiment, referring to FIG. 12, the reinforcement structures 30 may be disposed on the inner surface 22 in a different arrangement having a different density at different axial X locations. Specifically, in the present embodiment, the reinforcing structures 30 may be arranged side by side and at intervals along the circumferential direction of the inner surface 22 of the inner pipe body 20, where the reinforcing structures 30 are arranged at different positions in the axial direction X of the inner pipe body 20, and the distance between the reinforcing structures 30 and the two ends of the inner pipe body 20 has a positive correlation with the density of the reinforcing structures 30. That is, the farther from both ends of the inner pipe body 20, the higher the density of the reinforcing structures 30 is provided. Therefore, the long-length rotating shaft structure can be reinforced by enhancing the strength at the position most likely to generate deflection, and the stability in use is ensured. However, the arrangement density of the reinforcing structures 30 is not limited thereto.

Referring to FIG. 12, in one embodiment, the density of the reinforcing structure 30 is greatest at a location 1/2 of the axial X-extent of the inner surface 22 of the inner tubular body 20. In addition, in this embodiment, the length of each reinforcing structure 30 extending in the axial direction X is 1/3 of the length of the inner tube body 20 extending in the axial direction X, so that the reinforcing structure 30 is disposed at each position of the inner tube body 20 in the axial direction X, thereby achieving overall structural reinforcement.

Referring to fig. 3, in an embodiment, the cross-section of the inner tube 20 is circular, and the reinforcing structures 30 may be equally-arranged on the inner surface 22 of the inner tube 20, but the invention is not limited thereto.

In another embodiment, referring to fig. 13, the reinforcing structures 30 may be distributed on the inner surface 22 of the inner tube 20 at non-equal central angles of the inner surface 22 of the inner tube 20.

In addition, in another embodiment, in each of the embodiments as illustrated in fig. 1, 3 and 13, the length of the reinforcing structure 30 in the radial direction Y is smaller than the diameter of the inner tube 20 and also smaller than the radius of the inner tube 20. In the foregoing embodiments, the length of the reinforcing structure 30 in the radial direction Y is 1/12 of the diameter value of the inner pipe body 20, but the present invention is not limited thereto. The reinforcement effect is indeed achieved when the length of the reinforcing structure 30 in the radial direction Y is at least 1/12, which is the value of the diameter of the inner pipe body 20.

Referring to fig. 14 and 15, in other embodiments, the length of the reinforcing structure 30 in the radial direction Y may also be a value corresponding to the inner diameter of the inner tube 20. That is, the reinforcing structure 30 extends over the entire inner diameter of the inner tube 20. In the embodiment shown in fig. 14, the inner tube 20 is provided with two reinforcing structures 30, and the two reinforcing structures 30 are crossed to support the inner surface 22 of the entire inner tube 20. It should be noted that the arrangement of the reinforcing structure 30 having a length corresponding to the inner diameter of the inner tube 20 is not limited thereto. In the embodiment of the large-diameter rotating shaft structure, the number of the reinforcing structures 30 can be increased or decreased according to the strength requirement. And in an embodiment, referring to fig. 15, when the number of the reinforcing structures 30 is greater than two, the reinforcing structures 30 may be, but are not limited to, staggered at the center of the inner tube 20 to form a radial shape in the inner tube 20.

In the present embodiment, the outer surface 21 of the inner tube 20 is adhered to the inner surface 12 of the outer tube 10 by a tight fit. Thereby, the outer tube 10 and the inner tube 20 can be stably combined without the need of other combining media.

Referring to fig. 16 to 18, which are a schematic view (a) and a cross-sectional view of a rotating shaft structure according to a thirteenth embodiment of the present invention, respectively, a rotating shaft structure is shown, and a main difference between the present embodiment and the first embodiment is that the outer surface 21 of the inner tube 20 of the present embodiment is adhered to the inner surface 12 of the outer tube 10 by the adhesive 40. That is, before assembling, the adhesive 40 is uniformly coated on the outer surface 21 of the inner tube 20, and then the inner tube 20 is slowly inserted into the outer tube 10. After the adhesive 40 is completely cured, the outer surface 21 of the inner tube 20 is adhered to the inner surface 12 of the outer tube 10. This assembly method further ensures that the inner tube 20 and the outer tube 10 do not move relative to each other during operation. In an embodiment, the adhesive 40 may be epoxy, but the invention is not limited thereto.

In the embodiment that outer body 10 is stainless steel, the thickness of outer body 10 can be within a range of 1mm to 7mm according to practical application conditions, and when the thickness of outer body 10 is within a range of 1.5mm to 3mm, good balance can be obtained in intensity and shock resistance, but the utility model discloses do not use this as the limit.

In the embodiment where the outer pipe 10 is made of stainless steel and the inner pipe 20 is made of magnesium alloy, the thickness of the inner pipe 20 is in the range of 1mm to 5 mm. When the thickness of the inner tube 20 is in the range of 3mm to 5mm, the whole rotating shaft structure can obtain good shock resistance, the shock resistance obtained by excessively increasing the thickness of the inner tube 20 is very limited, and the manufacturing cost is increased.

In one embodiment, the sum of the thickness of the outer tube 10 and the thickness of the inner tube 20 is in the range of 5mm to 8mm, and in another embodiment, the sum of the thickness of the outer tube 10 and the thickness of the inner tube 20 is in the range of 5mm to 6 mm. In one aspect of the present embodiment, the lengths of the outer tube 10 and the inner tube 20 are 2327mm, the thickness of the outer tube 10 is 1.5mm, and the thickness of the inner tube 20 is 5 mm. Another aspect of this embodiment is that the length of the outer tube 10 and the inner tube 20 is 2327mm, the thickness of the outer tube 10 is 3mm, and the thickness of the inner tube 20 is 3mm, but the present invention is not limited thereto.

Referring to fig. 19, which is a schematic structural view of the brush of the present invention, fig. 19 shows a brush having a rotating shaft structure formed by the outer tube 10 and the inner tube 20, and further comprising a brush 50. The brush 50 is disposed on the outer surface 11 of the outer tube 10, and may be a sponge or a brush, and the brush 50 is illustrated as a brush in the figure. When the brush of this embodiment is used to clean the surface of the liquid crystal panel or the glass substrate, the brush rotates to make the brush body 50 brush the surface of the liquid crystal panel or the glass substrate, thereby cleaning the contaminants remained on the surface of the liquid crystal panel or the glass substrate.

In the embodiment of the present invention in which the outer tube 10 is made of stainless steel and the inner tube 20 is made of magnesium alloy, the density of the inner tube 20 is in the range of 1.9g/cm3 to 2.2g/cm3 according to the different alloy ratios. The density of stainless steel, for example, 304 stainless steel, is about 8g/cm3, so that the total weight of the shaft structure can be greatly reduced by using the shaft structure made of magnesium alloy and stainless steel, and even if the shaft structure has a high length-diameter ratio (length/diameter), for example, the length-diameter ratio is greater than 40, the deformation degree of the shaft structure is much less than that of the conventional stainless steel tube, thereby providing a good anti-vibration effect and effectively improving the problem that the conventional shaft structure is easy to generate vibration and noise when rotating at high speed.

In an embodiment of the brush, the total length of the outer tube 10 and the inner tube 20 is 2327mm, the thickness of the outer tube 10 is in a range from 1.5mm to 3mm, the thickness of the inner tube 20 is in a range from 3mm to 5mm, and the total thickness of the outer tube 10 and the inner tube 20 is in a range from 5mm to 6mm, but the invention is not limited thereto.

Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.

Claims (14)

1. A hinge structure, comprising:

an outer tube having an outer surface and an inner surface;

the inner tubes are respectively provided with an outer surface and an inner surface, the inner tubes are fixedly arranged in the outer tube, and the outer surfaces of the inner tubes are respectively attached to the inner surface of the outer tube; and

a reinforcing structure, which is arranged on the inner surface of at least one inner tube body in a protruding way.

2. The hinge structure of claim 1, wherein the outer tube has an outer tube length along an axial direction, the inner tubes have inner tube lengths along the axial direction, and the inner tube lengths of the inner tubes are smaller than the outer tube length.

3. The hinge structure of claim 2, wherein the sum of the lengths of the inner tubes is at least 50% of the length of the outer tube.

4. The hinge structure of claim 2, wherein the inner tubes of the plurality of inner tubes have different lengths.

5. The hinge structure of claim 2, wherein the inner tubes of the plurality of inner tubes have the same length.

6. A hinge structure according to claim 1, wherein the plurality of inner tubes are connected.

7. The hinge structure of claim 2, wherein the inner tubes have a gap in the axial direction.

8. The hinge structure of claim 4, wherein the length of the inner tube near the ends of the outer tube in the axial direction is shorter than the length of the inner tube far from the ends of the outer tube in the axial direction.

9. The hinge structure according to claim 2, wherein the reinforcing structure extends in the axial direction.

10. The hinge structure of claim 9, wherein the reinforcing structure extends along the axial direction by a length equal to the length of the inner tube.

11. The hinge structure of claim 9, wherein the reinforcing structure extends along the axial direction for a length less than the length of the inner tube.

12. The hinge structure according to claim 2, wherein the reinforcing structure extends in a circular ring shape around the axial direction.

13. The hinge structure of claim 2, wherein the reinforcing structure extends helically around the axial direction.

14. A brush comprising a brush body and a rotating shaft structure according to any one of claims 1 to 13, wherein the brush body is disposed on an outer surface of the outer tube of the rotating shaft structure.

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