Chaplet tool

Abstract

To enable simultaneous grinding of a plurality of chaplet targets and an efficient chaplet operation within a short time.SOLUTION: This chaplet tool comprises: a cylindrical case body 20; a shank 30 disposed at the position of the rotation axis O of an upper bottom 21 and gripped by an electric tool 13 so as to be rotatable about the rotation axis O; three bolt side brushes 40 that are arranged at every 120 degrees of arcs about the rotation axis O of a lower bottom 22 and that grip a first chaplet brush 42 having a brush length at the position of the lower bottom 22 side shorter than that at the position of the upper bottom 21 side toward the rotation axis O; a nut side brush 50 that is disposed in one of the three arcs between the bolt side brushes 40 of the lower bottom 22 and that grips a second chaplet brush 52 toward the rotation axis O; and end surface brushes 60 that are arranged in the remaining two of the three arcs between the bolt side brushes 40 on the cross section of the case body 20 and that grip a third chaplet brush 62 along the rotation axis O.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a scraping tool. [Background technology]

[0002] Conventionally, splice bolts and nuts for fastening members used in steel structures such as bridges are coated with a coating for corrosion prevention. Such coating is periodically repainted because the corrosion prevention effect of the coating film decreases with age and rust occurs. As a pretreatment before repainting, a surface grinding treatment using a scraper is performed to remove the deteriorated coating film and rust from the surfaces of the bolt heads and nuts (see, for example, Patent Documents 1 and 2).

[0003] Patent Document 1 describes a scraping tool in which, when an electric screwdriver connected to the shaft of a socket is rotated, the tip of the bolt passes through a hole at the bottom of the insert and reaches from the tip of the bolt to the nut, and the brush around the hole inserted into the bolt penetrates all over the peaks and valleys of the bolt to remove any rust, paint, etc.

[0004] Patent Document 2 describes a tool for scraping protruding objects such as bolts and nuts, in which a metal wire extends straight radially toward the central axis of the main body, and when the electric drill is rotated, the tip of the metal wire scrapes the side of the nut. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-43237 A [Patent Document 2] JP 2011-218449 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, conventional scraping tools have the following problems. That is, when the bolt thread and the nut screwed onto the bolt thread are to be scraped, the scraping tools described in Patent Documents 1 and 2 require two work steps, such as moving the brush to each position of the bolt thread and the nut in order, and changing the scraping tool for each scraping target with a different diameter. Therefore, there is a demand for a tool that can scrape the bolt, nut, and wall surface around the bolt simultaneously and efficiently in a short time, and there is room for improvement in this regard.

[0007] The present invention has been made in consideration of the above circumstances, and its object is to provide a scraping tool that can grind multiple scraping objects simultaneously and perform scraping work efficiently in a short time. [Means for solving the problem]

[0008] (1) Aspect 1 of the scraping tool of the present invention is a scraping tool that simultaneously scrapes a bolt threaded portion protruding from an end face of a target surface and a nut screwed onto the bolt threaded portion, and is characterized in that it comprises a cylindrical body portion having an upper bottom surface, a lower bottom surface, and a side surface with the center of the tube axis as the rotation axis, a shank portion that is arranged at the position of the rotation axis on the upper bottom surface and is held by an electric tool so as to be rotatable around the rotation axis, a bolt side brush portion that holds a first scraping brush toward the rotation axis, the first scraping brush being arranged in three positions on the lower bottom surface at 120 degree intervals on an arc centered on the rotation axis, the brush length at the position on the lower bottom surface being shorter than the brush length at the position on the upper bottom surface, a nut side brush portion that is arranged on one of the three arcs between the bolt side brush portions on the lower bottom surface and holds a second scraping brush toward the rotation axis, and an end face brush portion that is arranged on the remaining two of the three arcs between the bolt side brush portions of the circular cross section of the body and holds a third scraping brush along the rotation axis.

[0009] According to the scraping tool of the present invention, three types of brush parts, namely, a bolt side brush part having a first scraping brush for scraping the bolt side of the bolt thread part, a nut side brush part having a second scraping brush for scraping the nut side, and an end face brush part having a third scraping brush for scraping the end face of the target face, are supported on a body part fixed to the electric tool via a shank part. At this time, the three types of brush parts are arranged in a well-balanced manner in the circumferential direction around the rotation axis between three bolt side brush parts arranged evenly in the circumferential direction, with one nut side brush part and two end face brush parts corresponding to the three scraping target parts. Therefore, when the body part rotates around the rotation axis by the rotation drive of the electric tool, the three types of brush parts rotate together with the body part around the rotation axis, and the three scraping brushes can scrape and grind multiple scraping targets (bolt side, nut side, end face) at the same time, and the scraping work can be performed efficiently in a short time. Furthermore, with a scraping tool configured in this manner, there is no need to move it sequentially to each scraping target; once the scraping tool is set, scraping can be performed on all scraping targets while keeping it in the same position and posture, eliminating the need for movement time and improving work efficiency.

[0010] (2) In a second aspect of the present invention, in the scraping tool of the first aspect, it is preferable that the scraping tool further includes an urging portion that presses the end surface brush portion toward a tip side of the brush in a direction along the rotation shaft.

[0011] In this case, the third scraping brush of the end face brush part is urged toward the end face by the urging part, and the third scraping brush is always pressed against the end face with a constant pressing force, so that the third scraping brush rotating around the rotation axis can perform uniform grinding without unevenness in the circumferential direction.In addition, it is no longer necessary for the worker to press the scraping tool against the end face, which reduces the workload.

[0012] (3) In a third aspect of the present invention, in the scraping tool of the first or second aspect, it is preferable that at least one of the nut side brush portion and the end face brush portion is rotatably held relative to the lower bottom surface.

[0013] In this case, at least one of the nut side brush part and the end face brush part rotates while rotating around the rotation shaft, so the entire rotating scraping brush can be brought into uniform contact with the scraping target. This eliminates partial use of the scraping brush, improving the durability of the scraping brush. Effect of the Invention

[0014] According to the scraping tool of the present invention, a plurality of scraping objects can be ground simultaneously, and scraping work can be performed efficiently in a short time. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing a scraping tool according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a side view of the scraping tool shown in FIG. [Diagram 3] FIG. [Figure 4] 2 is a view taken along line II in FIG. 1, and is a plan view seen from the direction of the rotation axis. [Diagram 5] FIG. 4 is a side view showing the bolt side brush portion. [Figure 6] 6 is a cross-sectional view taken along the line VI-VI shown in FIG. [Figure 7] 7 is a cross-sectional view taken along line VII-VII shown in FIG. [Figure 8] FIG. 5 is a plan view showing the bolt thread and the nut in FIG. 4. [Figure 9] 1 is a perspective view of a nut side brush portion seen diagonally from above. FIG. [Figure 10] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the scraping tool according to the present invention will be described with reference to the drawings. In each drawing, the scale of each component may be appropriately changed as necessary to make each component large enough to be visible.

[0017] As shown in Figures 1 and 2, the scraping tool 1 of this embodiment is a tool that simultaneously scrapes a bolt side surface 11A of a bolt threaded portion 11 protruding from a target surface 10 and a nut side surface 12A of a nut 12 screwed into the bolt threaded portion 11.

[0018] The scraping tool 1 is detachably attached to a rotary drive shaft 13a of an electric power tool 13, and performs scraping work by rotating when the rotary drive force of the electric power tool 13 is transmitted. The electric power tool 13 may be, for example, a drive body such as an impact driver, an electric drill, or a disc grinder.

[0019] Here, the target areas to be scraped by the scraping tool 1 of this embodiment are the bolt side surface 11A, the nut side surface 12A, and the end surface 10A around the bolt threaded portion 11 (nut 12) of the target surface 10. Examples of such target areas to be scraped include bolts and nuts provided on bridges and the like.

[0020] The scraping tool 1 includes a case body 20 (body portion), a shank portion 30, a bolt side brush portion 40, a nut side brush portion 50, and an end face brush portion 60.

[0021] The case body 20 has a cylindrical shape, the center of the cylinder axis is the rotation axis O, and has an upper bottom surface 21, a lower bottom surface 22, and a side surface 23. The case body 20 is, for example, a plastic member. The case body 20 is attached to the power tool 13 with the rotation axis O coaxial with the rotation drive shaft 13a of the power tool 13. When the scraping tool 1 is in use, the rotation axis O coincides with the bolt center C of the bolt threaded portion 11, which is the part to be scraped.

[0022] Here, for convenience in the following description, in a posture in which the lower bottom surface 22 of the case body 20 faces the target surface 10 and the rotation axis O is coaxial with the bolt center C of the bolt threaded portion 11 that is the part to be scraped, the direction facing (approaching) the target surface 10 in the axial direction X along the rotation axis O is defined as the lower side X1, and the direction away from the target surface 10 is defined as the upper side X2. In addition, the direction perpendicular to the rotation axis O is defined as the radial direction, and the direction going around the rotation axis O as viewed from the axial direction of the rotation axis O is defined as the circumferential direction.

[0023] As shown in Figures 2 and 3, the shank portion 30 is disposed at the position of the rotation axis O of the upper bottom surface 21, and is rotatably and detachably held by the power tool 13 around the rotation axis O. The shank portion 30 is fixed to the case body 20 so as not to rotate, and protrudes from the center of the upper bottom surface 21 to the upper side X2. In other words, the case body 20 rotates integrally with the shank portion 30. The axial cross section of the shank portion 30 is formed into a hexagonal shape so as to transmit high torque. The shank portion 30 is held so that the rotation axis O is coaxial with the rotation drive shaft 13a of the power tool 13.

[0024] 1, 2 and 4, three bolt side brush parts 40 (40A, 40B, 40C) are arranged on the lower bottom surface 22 at 120 degree intervals on an arc centered on the rotation axis O. The bolt side brush part 40 includes a gripping part 41 extending in the axial direction X, and a first scraping brush 42 gripped radially inwardly of the gripping part 41 and extending radially inward from the gripping part 41. The grip portion 41 has a base end 41a fixed to the outer periphery 22a of the lower bottom surface 22 of the case body 20, and the other portion protrudes toward the lower side X1.

[0025] As shown in Fig. 5, the first scraping brush 42 is composed of a number of metal wires of a predetermined length, and the brush length L1 of the short portion 42A located on the lower bottom surface 22 side is shorter than the brush length L2 of the long portion 42B located on the upper bottom surface 21 side. That is, the first scraping brush 42 has a step portion 42c between the short portion 42A and the long portion 42B. The length L3 of this step portion 42c in the axial direction X is set to a dimension equivalent to the thickness of the nut 12 (see Fig. 6).

[0026] 6, a tip 42a of the short portion 42A faces the nut side surface 12A in the radial direction, and a tip 42b of the long portion 42B faces the bolt side surface 11A in the radial direction. As shown in FIG. 4, the three first scraping brushes 42 are arranged at regular intervals in the circumferential direction when viewed from the axial direction X, and the diameter of an imaginary circle circumscribing the tip 42a of the short portion 42A is set to be equal to or smaller than the diameter of the nut 12, and the diameter of an imaginary circle circumscribing the tip 42b of the long portion 42B is set to be smaller than the diameter of the bolt thread portion 11 (see FIG. 8).

[0027] The material of the first scraping brush 42 is, for example, brass, which is softer than a stainless steel brush. Therefore, the threaded portion of the bolt side surface 11A can be ground without being damaged. The material of the first scraping brush 42 is not limited to brass. In addition, the wire diameter of the metal wire of the first scraping brush 42 can be any appropriate thickness.

[0028] As shown in Figures 6, 7 and 8, the short portion 42A comes into contact with the nut side surface 12A and is scraped. The long portion 42B comes into contact with the threaded portion of the bolt side surface 11A and is scraped and ground. The step portion 42c comes into contact with the end face 12B in the thickness direction of the nut 12 and is scraped and ground. The bolt side surface 11A and the nut side surface 12A are scraped by rotating the scraping tool 1 in the circumferential direction while being in contact with the first scraping brushes 42 arranged at three positions in the circumferential direction.

[0029] As shown in Fig. 1, Fig. 2 and Fig. 4, the nut side brush part 50 is disposed in one of three arcs between the bolt side brush parts 40 on the lower bottom surface 22. As shown in Fig. 9, the nut side brush part 50 includes a support shaft 51 extending along the axial direction X, and a second scraping brush 52 rotatably supported on the support shaft 51 and extending from the support shaft 51 all around in the circumferential direction toward the outside in the radial direction. As shown in Fig. 2, the support shaft 51 has a base end 51a fixed to the outer periphery 22a of the lower bottom surface 22 of the case body 20, and the other part is provided to protrude downward.

[0030] The second scraping brush 52 is composed of a number of metal wires of a certain length, and is circular in shape with the support shaft 51 as the center when viewed from the axial direction X. The second scraping brush 52 is provided at a height corresponding to the nut 12 (see FIG. 6). The lower surface 52b of the second scraping brush 52 is almost the same height as the lower end 42d of the first scraping brush 42. As shown in FIG. 9, the thickness D1 of the second scraping brush 52 in the axial direction X is set to a dimension equivalent to the thickness (height) of the nut 12. A part of the outer periphery 52a of the second scraping brush 52, which rotates around the support shaft 51 with the rotation of the scraping tool 1 in the circumferential direction, always faces any part of the nut side surface 12A (see FIG. 8).

[0031] The material of the second scraping brush 52 is, for example, stainless steel, which is harder than brass. Therefore, rust on the nut side surface 12A can be reliably ground away. The material of the second scraping brush 52 is not limited to stainless steel. The wire diameter of the metal wire of the second scraping brush 52 can be any appropriate diameter.

[0032] 6, 7, and 8, the second scraping brush 52 is set to a diameter dimension that allows the outer circumferential portion 52a to contact the nut side surface 12A. That is, the second scraping brush 52 is disposed between the first scraping brushes 42 adjacent to each other in the circumferential direction, and scrapes and grinds the nut side surface 12A together with the first scraping brushes 42.

[0033] The nut side surface 12A is scraped and ground by rotating the scraping tool 1 in the circumferential direction while being in contact with the second scraping brush 52. In addition, the second scraping brush 52 itself also rotates around the support shaft 51, so that the nut side surface 12A can be effectively ground.

[0034] 1, 2 and 4, the end surface brush part 60 is disposed in the remaining two of the three arcs between the bolt side surface brush parts 40 of the circular cross section of the case body 20. As shown in FIG. 10, the end surface brush part 60 includes a support shaft 61 extending along the axial direction X, and a third scraping brush 62 fixed to a grip part 61B located at the lower part of the support shaft 61 and extending from the grip part 61B to the lower side X1 in the axial direction X (see FIGS. 7 and 8). The support shaft 61 has a base end part 61a fixed to the outer circumferential part 22a of the lower bottom surface 22 of the case body 20, and the other part is provided so as to protrude downward.

[0035] 2, a spring member 63 (urging portion) that presses the end face brush part 60 toward the brush tip 60a side (lower side X1) in the direction along the axial direction X is provided inside the case body 20. A spring coil is used as the spring member 63. The support shaft 61 has a shaft body 61A and a grip portion 61B provided at the lower end of the shaft body 61A and having a larger diameter than the shaft body 61A (see FIG. 10). The end face brush portion 60 is biased downward by a spring member 63 housed in a spring housing portion 24 formed in the case body 20. That is, the shaft body 61A is inserted into the inside of the spring from the lower end 63a side of the spring member 63, and the lower end 63a of the spring member 63 abuts against an upper end 61c of the grip portion 61B. As a result, the end face brush portion 60 is biased downward X1.

[0036] The third scraping brush 62 is composed of a number of metal wires of a certain length. As shown in Fig. 2, the lower surface 62a of the third scraping brush 62 is located slightly below the lower end 42d of the first scraping brush 42 and the lower surface 52b of the second scraping brush 52 (see Fig. 7). 8, the lower surface 62a of the third scraping brush 62 has a substantially circular shape in plan view as viewed from the axial direction X. The third scraping brush 62 rotates about the support shaft 61 in conjunction with the circumferential rotation of the scraping tool 1, and always faces the end surface 10A of the target surface 10 around the nut 12 in the axial direction X (see FIG. 7).

[0037] The material of the third scraping brush 62 is, for example, stainless steel, which is harder than brass. Therefore, the concrete surface of the end face 10A can be reliably ground. The material of the third scraping brush 62 is not limited to stainless steel. In addition, the wire diameter of the metal wire of the third scraping brush 62 can be any appropriate diameter.

[0038] 7 and 8, the lower surface 62a of the third scraping brush 62 is pressed against the end surface 10A to scrape and grind the end surface 10A. In other words, the end surface 10A is scraped and ground by rotating the scraping tool 1 in the circumferential direction with the lower surface 62a of the third scraping brush 62 in contact with the end surface 10A. In addition, the third scraping brush 62 itself can also rotate around the support shaft 61 to effectively grind the end surface 10A.

[0039] Next, a method of simultaneously scraping and grinding away rust, deteriorated coatings, etc. that have occurred on the bolt side 11A, nut side 12A, and end face 10A of the target surface 10 of the bolt thread portion 11, which are the objects to be scraped, using the scraping tool 1 having the above-described configuration, and the operation of the scraping tool 1 will be specifically described.

[0040] As shown in Fig. 1, first, the scraping tool 1 is attached to the power tool 13. That is, the shank portion 30 of the scraping tool 1 is held by the rotary drive shaft 13a of the power tool 13. After the scraping tool 1 is held by the power tool 13 in this manner, the scraping tool 1 is moved in the direction of arrow E shown in Figs. 1 and 2 to set the scraping tool 1 to the scraping position P (see Figs. 6 to 8) so that the bolt thread portion 11 and the nut 12 enter the storage area R surrounded by the three first scraping brushes 42. At this time, the first scraping brush 42 contacts the bolt side surface 11A and the nut side surface 12A, the second scraping brush 52 contacts the nut side surface 12A, and the third scraping brush 62 contacts the end surface 10A.

[0041] 6 to 8, when the power tool 13 is driven in this state to rotate the scraping tool 1 around the rotation axis O, the scraping brushes 42, 52, 62 supported by the case body 20 simultaneously rotate around the rotation axis O. By holding the scraping tool 1 in this state for a while, the surface of the area to be scraped that comes into contact with the scraping brushes 42, 52, 62 can be scraped and ground. That is, in the scraping tool 1, the bolt side surface 11A is scraped and ground with the long portion 42B of the first scraping brush 42, the nut side surface 12A is scraped and ground with the short portion 42A of the first scraping brush 42, the nut side surface 12A is scraped and ground with the outer circumferential portion 52a of the second scraping brush 52, and the end surface 10A is scraped and ground with the lower surface 62a of the third scraping brush 62.

[0042] Next, the operation of the scraping tool 1 will be described in detail with reference to Figs. The scraping tool 1 of this embodiment has three types of brush parts supported by a case body 20 fixed to the power tool 13 via a shank portion 30: a bolt side brush part 40 equipped with a first scraping brush 42 for scraping the bolt side surface 11A of the bolt thread portion 11; a nut side brush part 50 equipped with a second scraping brush 52 for scraping the nut side surface 12A; and an end face brush part 60 equipped with a third scraping brush 62 for scraping the end surface 10A of the target surface 10. In this case, the three types of brush parts 40, 50, 60 are arranged in a balanced manner in the circumferential direction around the rotation axis O, with one nut side brush part 50 and two end face brush parts 60 between the three bolt side brush parts 40 that are evenly arranged in the circumferential direction to correspond to the three areas to be cleaned. Therefore, when the case body 20 rotates around the rotation axis O due to the rotation drive of the electric tool 13, the three types of brush parts 40, 50, 60 also rotate together with the case body 20 around the rotation axis O, and the three scraping brushes 42, 52, 62 can scrape and grind multiple scraping objects (bolt side surface 11A, nut side surface 12A, end surface 10A) simultaneously, allowing the scraping work to be performed efficiently in a short amount of time.

[0043] Furthermore, with the scraping tool 1 according to this embodiment, there is no need to move it sequentially to each scraping target. Once the scraping tool 1 is set, scraping of all scraping targets can be performed while keeping the tool 1 in the same position and posture, eliminating the need for movement time and improving work efficiency.

[0044] In this embodiment, a spring member 63 that presses the end face brush portion 60 toward the brush tip side in the direction along the rotation axis O is further provided. Therefore, the third scraping brush 62 of the end face brush part 60 is biased toward the end face 10A by the spring member 63, and the third scraping brush 62 is always pressed against the end face 10A with a constant pressing force, so that the third scraping brush 62 rotating about the rotation axis O can perform uniform grinding without unevenness in the circumferential direction. In addition, it is no longer necessary for an operator to press the scraping tool 1 against the end face 10A, so the workload can be reduced.

[0045] In addition, in the scraping tool 1 according to this embodiment, at least one of the nut side surface brush portion 50 and the end surface brush portion 60 is held rotatably relative to the lower bottom surface 22. Therefore, at least one of the nut side brush part 50 and the end face brush part 60 rotates while rotating around the rotation axis O, so that the entire rotating scraping brush can be brought into uniform contact with the scraping target. This eliminates partial use of the scraping brush, improving the durability of the scraping brush.

[0046] The scraping tool 1 according to the present embodiment configured as described above can grind a plurality of scraping objects simultaneously, and can perform the scraping work efficiently in a short time.

[0047] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. The embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. The embodiments and their modifications include, for example, those that can be easily imagined by a person skilled in the art, those that are substantially the same, those that are within the scope of the equivalents, and the like.

[0048] For example, the scraping tool 1 in the above embodiment is configured with a spring member 63 (urging portion) that presses the end face brush portion 60 toward the brush tip in the axial direction X, but it is also possible to omit such a spring portion and configure the end face brush portion 60 so that it does not have a pressing function. Moreover, the biasing portion is not limited to the spring member 63 as described above, and a biasing portion of another form may be adopted.

[0049] In addition, in this embodiment, at least one of the nut side brush portion 50 and the end surface brush portion 60 is rotatably held relative to the lower bottom surface 22 and is arranged to be rotatable on its own axis, but this is not limited to a configuration in which the nut side brush portion 50 and the end surface brush portion 60 are supported so as to rotate on their own axis.

[0050] Furthermore, the specific shape, dimensions, and other configurations of each of the brush parts 40, 50, 60 can be set in accordance with the shape, dimensions, and other configurations of the bolt threaded part 11 and nut 12 to be cleaned. [Explanation of symbols]

[0051] 1 Scraping tool 10 Target Surface 10A end face 11 Bolt thread 11A Bolt side 12 Nut 12A Nut side 12B End face 13 Power tools 20 Case body (body) 21 Upper base 22 Bottom surface 23 Side 30 Shank 40, 40A, 40B, 40C Bolt side brush part 42 No. 1 Cleaning Brush 42A Short section 42B Long section 50 Nut side brush part 52 No. 2 Cleaning Brush 52a Outer periphery 60 End brush part 62 No. 3 Cleaning Brush 63 Spring member (biasing part) C Bolt center O Rotation axis X-axis direction

Claims

1. A scraping tool for simultaneously scraping a bolt thread portion protruding from an end face of a target surface and a nut screwed onto the bolt thread portion, A cylindrical body portion having a rotation axis centered on a cylinder axis and having an upper bottom surface, a lower bottom surface, and a side surface; A shank portion is disposed at a position of the rotation axis on the upper bottom surface and is gripped by an electric power tool so as to be rotatable around the rotation axis; a bolt side brush part that holds a first scraping brush toward the rotation shaft, the first scraping brush being arranged on the lower bottom surface at 120 degree intervals of an arc centered on the rotation shaft, the brush length at the position on the lower bottom surface being shorter than the brush length at the position on the upper bottom surface; A nut side brush part is disposed on one of the three arcs between the bolt side brush parts on the lower bottom surface and holds a second scraping brush toward the rotation shaft; an end surface brush portion that is disposed on the remaining two of the three arcs between the bolt side surface brush portions of the circular cross section of the body portion and that grips a third scraping brush aligned with the rotation axis; A scraping tool comprising:

2. Further, a biasing portion is provided which biases the end surface brush portion toward a brush tip side in a direction along the rotation shaft. The scraping tool according to claim 1.

3. At least one of the nut side brush portion and the end surface brush portion is rotatably held relative to the lower bottom surface. The scraping tool according to claim 1 or 2.

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