WO2024084720A1

WO2024084720A1 - Applicator

Info

Publication number: WO2024084720A1
Application number: PCT/JP2023/007752
Authority: WO
Inventors: 哲武川; 善彦中村
Original assignee: 株式会社Ｉｈｉインフラシステム
Priority date: 2022-10-17
Filing date: 2023-03-02
Publication date: 2024-04-25
Also published as: JP2024058886A

Abstract

An applicator is provided, with which an even coating film having a sufficient thickness can be ensured and a coating operation can be easily conducted without using a coating material in excess.　An applicator main body 10 including brushes 20 each having a coating material adherent thereto is put over a bolt 1, a nut 2, and a washer 4 and is rotationally moved in the circumferential direction. Thus, the brushes 20 disposed in a plurality of portions of the applicator main body 10 along the circumferential direction simultaneously apply the coating material. In doing so, since the brushes 20 are covered by the applicator main body 10, the coating material is not scattered to the outside of the applicator main body 10 even when the brushes 20 are rotated together with the applicator main body 10. In addition, the coating material which has been adhered to the inner surface of the applicator main body 10 and flowed down gathers in a coating material receiving part 11 at the opening rim of the applicator main body 10. The coating material hence does not drip outward from the opening rim of the applicator main body 10.

Description

Painting tools

The present invention relates to a painting tool used to paint protruding objects, such as bolts and nuts that fasten various components.

　Generally, the exposed parts of bolts and nuts that fasten components of steel structures such as bridges and floodgates are coated with anti-corrosion paint.

　Airless spray painting has been known as one of the conventional methods for painting such bolts and nuts. Airless spray painting is a method in which paint is sprayed onto the object to be painted by atomizing it under high pressure using a plunger pump or diaphragm pump, and is widely used for painting large areas such as steel structures. However, the fastening part of a bolt is made of a nut and flat washer, and has a complex shape that not only has flat parts but also uneven parts and corners. For this reason, spray painting is unable to ensure a paint film of sufficient thickness on the corners of bolts and nuts, which can lead to corrosion before the end of their useful life.

In addition, one method of painting such bolts and nuts is by brush painting. However, with brush painting, uneven application and variation in paint thickness can easily occur depending on the worker, which can lead to problems with reduced corrosion resistance in unpainted areas and thin-film areas.

To solve these problems, a method is known in which a cylindrical cup is placed over the bolt and nut, and paint is injected between the inner surface of the cup and the bolt and nut, forming a coating that is uniform and sufficiently thick (see, for example, Patent Document 1).

Japanese Patent No. 5606183

However, with the cup-type paint, the paint is filled into a cup that covers the entire painted portion of the bolt and nut, which results in excessive paint usage, high paint costs, and paint dripping from the painted portion, damaging the aesthetic appearance.

The present invention was made in consideration of the above problems, and its purpose is to provide a painting tool that can ensure a uniform and sufficiently thick coating film and allows painting work to be performed easily without using excessive paint.

In order to achieve the above object, the present invention provides a painting tool that includes a painting tool body that is placed over a protruding object to be painted, and a number of brushes that are arranged inside the painting tool body, and that applies paint from the brushes to the object by attaching paint to the brushes and placing the painting tool body over the object and rotating it in the circumferential direction of the object to be painted. The painting tool body is formed so that each brush is covered by a roughly hemispherical member that has an opening on the surface into which the object to be painted is inserted, and a paint receiving section that receives paint that flows down from the inner surface of the painting tool body is provided around the circumferential direction of the painting tool body.

As a result, paint is applied to the brush, the tool body is placed over the object to be painted, and the tool body is rotated in the circumferential direction of the object to be painted; thus, paint is simultaneously applied to the object by the brushes at multiple points around the tool body. Since each brush is covered by the tool body, paint does not scatter outside the tool body even when each brush rotates with the tool body. In addition, paint that adheres to the inner surface of the tool body and flows down collects in the paint receiving section at the edge of the opening of the tool body, so paint does not drip outside from the edge of the opening of the tool body.

According to the present invention, a thick-film coating by brush painting can be ensured on the object to be painted, and there is an advantage that excessive paint is not used compared to conventional cup-injection painting. In addition, painting can be performed simply by rotating the painting tool body placed over the object to be painted, making the painting work extremely easy, and a uniform coating film can be formed without uneven coating or variation in coating thickness compared to when the worker directly paints with a brush. Furthermore, painting can be performed simultaneously with multiple brushes around the periphery of the painting tool body, so the entire object to be painted can be painted efficiently. In this case, paint does not splash outside the painting tool body, and paint does not drip outside from the opening edge of the painting tool body, so it is possible to prevent paint from adhering to the work area or the worker, and to reduce waste of paint due to splashing outside or running off.

FIG. 1 is a perspective view of a coating tool showing an embodiment of the present invention; Side view of painting tool Plan view of painting tools Bottom view of the spray tool body An exploded cross-sectional side view of the paint tool body and the paint receiving part FIG. 1 is a side cross-sectional view of a coating tool in a first position. FIG. 1 is a side cross-sectional view of the applicator in a second position. FIG. 13 is a side cross-sectional view of the applicator in a third position. FIG. 13 is a side cross-sectional view of the applicator in a fourth position. Exploded side view of painting tool 1 is a side view of a first brush support member; 2 is a side view of a second brush support member; A side view of the third brush support member 4 is a side view of a fourth brush support member Plan views of first to fourth brush support members A side view showing the painting tool in use

Figures 1 to 16 show one embodiment of the present invention, illustrating a painting tool used to paint bolts and nuts as protruding objects to be painted.

The bolt 1 and nut 2 shown in the figure are used to fasten a target member 3 made of steel plate for steel structures such as bridges and water gates. The nut 2 is screwed onto the threaded portion of the bolt 1 that protrudes from the surface of the target member 3, and a washer 4 is provided between the nut 2 and the target member 3.

The painting tool of this embodiment comprises a painting tool body 10 that is fitted over the bolt 1 and nut 2, a number of brushes 20 provided inside the painting tool body 10, and first to fourth brush support members 31 to 34 that support the brushes 20, and is attached to an electric rotary tool 40 for use.

The paint sprayer body 10 is made of a bowl-shaped hemispherical member, and a paint receiving portion 11 for receiving paint is provided on the edge of its opening. The paint receiving portion 11 is made of a ring-shaped member with an outer diameter equal to the opening of the paint sprayer body 10, and is fixed to the edge of the opening of the paint sprayer body 10. The paint receiving portion 11 is formed so that it curves upward in the figure toward the inside of the opening of the paint sprayer body 10 in an arc-shaped cross section, and is formed around the entire circumferential direction of the opening edge of the paint sprayer body 10.

The inner surface of the paint tool body 10 is provided with a number of engagement parts 12 with which each brush support member 30 engages, and each engagement part 12 is formed so that the paint tool body 10 engages between a pair of protrusions 12a that extend radially from the center of the paint tool body 10 toward the opening edge.

A rotating shaft 13 that is connected to an electric rotary tool 40 is attached to the top of the paint tool body 10, and the rotating shaft 13 is formed so that it can be connected to a chuck 41 of the electric rotary tool 40.

The brush 20 is a flat brush without a handle, and its base end is fixed to the first to fourth brush support members 31 to 34 so that its tip extends toward the inside of the paint tool body 10.

The first to fourth brush support members 31 to 34 are formed in a generally semicircular arc shape that extends along the inner surface of the paint tool body 10, and each is adapted to support four brushes 20. In this case, the brushes 20 are arranged in symmetrical positions, two on each side of the first to fourth brush support members 31 to 34, spaced apart in the vertical direction in the figure. The first to fourth brush support members 31 to 34 are also arranged so that their positions are shifted at equal intervals from one another in the circumferential direction of the paint tool body 10, and the positions of the brushes 20 on the radial lines extending from the center of the paint tool body 10 toward the opening edge are different from one another.

In other words, the first brush support member 31, which is placed at the first position A (the position of line A-A in FIG. 3), is placed so that the upper brush 20 mainly contacts the upper surface of the bolt 1, and the lower brush 20 mainly contacts the washer 4 and the fastening target member 3, as shown in FIG. 6.

The second brush support member 32, which is positioned at the second position B (position of line B-B in FIG. 3), is positioned so that the upper brush 20 mainly contacts the side of the bolt 1, and the lower brush 20 mainly contacts the upper part of the side of the nut 2, as shown in FIG. 7.

The third brush support member 33, which is positioned at the third position C (line C-C in FIG. 3), is positioned so that the upper brush 20 mainly contacts the top surface of the nut 2, and the lower brush 20 mainly contacts the lower side surface of the nut 2, as shown in FIG. 8.

The fourth brush support member 34, which is positioned at the fourth position D (line D-D position in Figure 4), is similar to the second brush support member 32, and is positioned so that the upper brush 20 mainly contacts the side of the bolt 1, and the lower brush 20 mainly contacts the upper part of the side of the nut 2, as shown in Figure 9.

In the first to fourth positions A to D, the brushes 20 at different circumferential positions of the paint tool body 10 are arranged with a shift in at least one of the axial and radial directions of the paint tool body 10 so that at least a portion of each brush overlaps at intervals in the circumferential direction of the paint tool body 10. In other words, when the brushes 20 at the first to fourth positions A to D are overlapped in the circumferential direction of the paint tool body 10, the positions of a portion of each brush 20 are shifted in at least one of the axial and radial directions of the paint tool body 10, and each brush 20 is arranged so as to be continuous with each other on the circumferential projection plane of the paint tool body 10.

The first to fourth brush support members 31 to 34 engage with the engagement parts 12 at the first to fourth positions A to D, respectively, and are fixed to the inner surface of the paint tool body 10 so that the intersection parts 31a to 34a located in the center intersect with each other. In this case, each intersection part 31a to 34a is formed so that it is smaller in size in the vertical direction in the figure than the other parts, and is provided so that its position in the vertical direction in the figure is different from each other. In other words, the intersection parts 31a to 34a that intersect with each other overlap in the vertical direction in the figure, so that the first to fourth brush support members 31 to 34 are arranged at the same position in the vertical direction in the figure. In this case, as shown in FIG. 10, the fourth brush support member 34, the third brush support member 33, the second brush support member 32, and the first brush support member 31 are fixed to the paint tool body 10 in this order, and then the paint receiving part 11 is fixed to the paint tool body 10.

The electric rotary tool 40 is a well-known device that rotates tools such as drills and drivers, has a chuck 41 that detachably connects the rotating shaft 13 of the paint tool body 10, and rotates the paint tool body 10 connected to the chuck 41. The electric rotary tool 40 is provided with a gripping part 42 for holding with fingers, and the gripping part 42 is provided with a switch 43 for operating the motor. When the switch 43 is pressed with a finger while holding the gripping part 42, the motor rotates, and when the pressure is released, the motor stops rotating.

When using the painting tool configured as described above to paint an object to be painted (bolt 1, nut 2, and washer 4), first, paint is poured into the painting tool body 10 from a paint container (not shown), and the paint is applied to each brush 20.

Next, as shown in FIG. 16, the paint tool body 10 is placed over the object to be painted, and the switch 43 of the electric rotating tool 40 is operated to operate the motor, thereby rotating the paint tool body 10 in the circumferential direction. As a result, each brush 20 rotates with the paint tool body 10 while in contact with the surface of the object to be painted and the fastening target member 3, and the paint of each brush 20 is applied to the object to be painted and the fastening target member 3. At this time, the brush 20 at the first position A, the brush 20 at the second and fourth positions B and D, and the brush 20 at the third position C are arranged so that their positions are shifted from each other in at least one of the axial and radial directions of the paint tool body 10, so that no gaps are generated in the coating portion by the brush 20 at each position in the circumferential direction of the paint tool body 10, and each brush 20 contacts the surface of the object to be painted and the fastening target member 3 evenly, and the paint is evenly applied to the entire surface of these surfaces.

In other words, at the first position A of the paint tool body 10, the brushes 20 of the first brush support member 31 apply paint mainly to the top surface of the bolt 1, the washer 4, and the fastening target member 3, and at the second position B and fourth position D, the brushes 20 of the second and fourth

brush support members

32, 34 apply paint mainly to the side surface of the bolt 1 and the upper side surface of the nut 2. Also, at the third position C, the brushes 20 of the third brush support member 33 apply paint mainly to the top surface and lower side surface of the nut 2.

At that time, since each brush 20 is covered by the paint tool body 10, paint does not scatter outside the paint tool body 10 even when each brush 20 rotates with the paint tool body 10. In addition, since the paint that adheres to the inner surface of the paint tool body 10 and flows down collects in the paint receiving section 11 at the opening edge of the paint tool body 10, paint does not drip outside from the opening edge of the paint tool body 10.

In this way, the paint tool of this embodiment is equipped with a paint tool body 10 that is placed over a protruding object to be painted, and multiple brushes 20 that are provided inside the paint tool body 10. The paint is applied to each brush 20, the paint tool body 10 is placed over the object to be painted, and the paint tool body 10 is rotated in the circumferential direction of the object to be painted, so that the paint from each brush 20 is applied to the object to be painted. This ensures a paint film of sufficient thickness even at the corners of the object to be painted by thick-film painting with the brush, and has the advantage of not using excessive paint compared to conventional cup-injection painting. Furthermore, painting can be performed simply by rotating the paint tool body 10 that is placed over the object to be painted, making the painting work easy, and a uniform paint film without unevenness in paint or variation in paint thickness can be formed compared to when the worker directly applies paint with a brush.

The paint tool body 10 is made of a roughly hemispherical member with an opening on the surface where the object to be painted is inserted, and is formed to cover each brush 20. The edge of the opening of the paint tool body 10 is provided with a paint receiving section 11 that receives paint that flows down from the inner surface of the paint tool body 10. This prevents paint from scattering outside the paint tool body 10, prevents paint from adhering to the work area or to the worker, and reduces the waste of paint due to scattering or running off to the outside.

In this case, the paint receiving portion 11 is formed so that it curves in a circular arc shape in cross section toward the inside of the opening edge of the paint tool body, so that it can reliably catch the paint that flows down from the inner surface of the paint tool body 10. Also, because the paint receiving portion 11 is formed so that it curves in a circular arc shape in cross section, it is possible to reduce the contact area between the paint receiving portion 11 and the surface of the fastening target member 3. As a result, even when the paint tool body 10 is rotated while the paint receiving portion 11 is in contact with the surface of the fastening target member 3, it is possible to reduce the contact resistance, and the paint tool body 10 can always rotate smoothly.

Furthermore, since the brushes 20 are spaced apart around the periphery of the paint tool body 10, painting can be performed simultaneously with the brushes 20 at multiple locations around the periphery of the paint tool body 10, allowing efficient painting of the entire object to be painted. In this case, the multiple brushes 20 at different circumferential positions around the paint tool body 10 are arranged so that their positions are offset from each other in at least one of the axial and radial directions of the paint tool body 10, so that no gaps are created in the coating areas applied by the brushes 20 at each circumferential position of the paint tool body 10, and uneven coating can be reliably prevented. In this case, since each brush 20 expands in the width direction when it absorbs paint, the amount of overlap between the brushes 20 can be increased.

Furthermore, the paint tool is provided with a plurality of first to fourth brush support members 31 to 34 that support each brush 20. The brush support members 31 to 34 are arranged so that their positions are offset from one another in the circumferential direction of the paint tool body 10. This allows brushes 20 at different positions in the axial and radial directions of the paint tool body 10 to be provided on each of the brush support members 31 to 34, making it easy to assemble the entire paint tool.

In this case, each brush support member 31-34 is formed by an arc-shaped member that extends along the inner surface of the paint tool body 10, and is fixed to the inner surface of the paint tool body 10 so that their centers intersect with each other, so there is no need to separate each brush support member 31-34 at the center of the paint tool body 10, and the number of parts and assembly labor can be reduced.

In addition, the paint tool body 10 is provided with a rotating shaft 13 that can be detachably connected to the electric rotary tool 40, so that a general-purpose electric rotary tool 40 can be used as the driving means for the paint tool body 10, improving versatility and reducing the cost of the paint tool itself.

Note that the number and circumferential arrangement of the brushes 20 shown in each of the above embodiments are merely examples and are not limited to those described in the above embodiments.

In the above embodiment, the applicator body 10 is rotated by the electric rotary tool 40, but it may be rotated manually by providing a grip that can be held by fingers.

Furthermore, in the above embodiment, the bolt 1, nut 2, and washer 4 are painted, but the present invention can be applied to any other object that has a protruding shape.

1...Bolt, 2...Nut, 4...Washer, 10...Painting tool body, 11...Paint receiving part, 20...Brush, 31...First brush support member, 32...Second brush support member, 33...Third brush support member, 34...Fourth brush support member, 40...Electric rotary tool.

Claims

A coating tool comprising a coating tool body that is adapted to cover a protruding object to be coated and a plurality of brushes arranged inside the coating tool body, in which paint is applied to the brushes, the coating tool body is placed over the object to be coated, and the coating tool is rotated in the circumferential direction of the object to apply paint from the brushes to the object to be coated,
The coating tool body is formed so as to cover each brush with a substantially hemispherical member having an opening on a surface into which an object to be coated is inserted,
A coating tool comprising: a coating material receiving portion provided around an opening edge of the coating tool body in a circumferential direction of the coating tool body for receiving coating material flowing down from an inner surface of the coating tool body.
The coating tool according to claim 1, wherein the paint receiving portion is formed so as to be curved in an arc shape in cross section toward an inner edge of an opening of the coating tool body.
The brushes are arranged at intervals in the circumferential direction of the paint tool body,
2. The coating tool according to claim 1, wherein a plurality of brushes having different circumferential positions on the coating tool body are arranged so as to be offset from one another in at least one of the axial and radial directions of the coating tool body.
A plurality of brush support members are fixed to the inner surface of the coating tool body and support the brushes,
2. The coating tool according to claim 1, wherein the brush support members are arranged so as to be offset from one another in the circumferential direction of the coating tool body.
The coating tool according to claim 4, characterized in that each of the brush support members is formed by an arc-shaped member extending along the inner surface of the coating tool body, and is fixed to the inner surface of the coating tool body so that their center portions intersect with each other.
The coating tool according to any one of claims 1 to 5, characterized in that the coating tool body is provided with a rotating shaft which is detachably connected to an electric rotating tool.