Tile adhesive application scraper with adjustable width and length

Abstract

A tile adhesive application scraper of the present application comprises: a front plate part including a first front plate, which has a plurality of first notches, and a second front plate, which is positioned to be overlapped with at least a portion of one end of the first front plate and has a plurality of second notches; a first guide part extending rearward from one end of the first front plate; a second guide part extending rearward from the other end of the second front plate; a length-adjusting part for adjusting the length of the front plate in the width direction; a depth-adjusting plate including a first depth-adjusting plate, which is coupled to the front of the first front plate and adjusts the depth of the first notch, and a second depth-adjusting plate, which is coupled to the front of the second front plate and adjusts the depth of the second notch; and a depth-adjusting part, which adjusts the position at which the depth-adjusting plate is coupled, so as to adjust the depth of the first and second notches.

Description

Tile adhesive application scraper with adjustable width and length

[0001] The present invention relates to a scraper for applying tile adhesive, with adjustable width and length. Specifically, the present invention relates to a scraper that can provide workers with adjustable width and length without requiring workers to prepare scrapers of various sizes, thereby enhancing worker convenience and reducing tool costs.

[0002] A scraper is used to evenly spread cement or adhesive for installing tiles on surfaces such as walls or floors. Typically, a scraper consists of a flat body and a handle connected to the body, which smooths the surface with cement or adhesive.

[0003] In this regard, U.S. Patent No. 7,370,384 (Title: Combination wedge and notch trowel with reversible grip handle) discloses a trowel formed on a main body having a plurality of notches formed at adjacent edges for spreading cement.

[0004] Notches come in square, circular, serrated, and triangular shapes, as well as rounded notches with angled sides that flare outward and inward. These notches allow cement or adhesive to be applied to walls or floors with a uniform thickness, and allow air between the tile and cement to escape, preventing air pockets from forming.

[0005] Meanwhile, there is the inconvenient problem of having to carry around scrapers with notches of different sizes depending on the tile and installation location.

[0006] An object of the present invention is to provide a tile adhesive application scraper capable of adjusting not only the width and length but also the depth of the notch.

[0007] However, the technical task that this embodiment seeks to achieve is not limited to the technical task described above, and other technical tasks may exist.

[0008] As a technical means for solving the above-described technical problem, a cement pressing scraper according to a first embodiment of the present invention comprises: a front plate portion configured in a predetermined flat shape having a plurality of notches formed at the bottom; a first guide portion and a second guide portion respectively extending rearward from one end and the other end of the front plate portion; and a pressing portion formed such that both ends are fixed to the inside of the first guide portion and the inside of the second guide portion, respectively, to connect between the first guide portion and the second guide portion, and is positioned at a predetermined height from the floor to press cement when the scraper moves.

[0009] The front plate portion further includes a first front plate having a plurality of first notches formed at the bottom, and a second front plate positioned so that at least a portion of one end of the first front plate overlaps and having a plurality of second notches formed at the bottom, and a length adjusting portion for adjusting the length in the width direction of the front plate.

[0010] The scraper further includes a depth adjustment plate having a first depth adjustment plate coupled to the front of the first front plate and adjusting the depth of the first notch, and a second depth adjustment plate coupled to the front of the second front plate and adjusting the depth of the second notch; and a depth adjustment unit that adjusts the depth of the first and second notches by adjusting the position at which the depth adjustment plates are coupled.

[0011] The scraper further includes a wheel part having a plurality of wheels at the bottom and is respectively connected to the first guide part and the second guide part, and adjusts the length in the width direction of the front plate through the depth adjustment part, and adjusts the depth of the notch through the depth adjustment part.

[0012] The above compression part has a cross section of ' ' can be formed by bending into a shape.

[0013] The above-mentioned compression member may include a plurality of adhesive passage holes formed at positions corresponding to the grooves of the plurality of notches.

[0014] In addition, the wheel part may further include a wheel fixing plate fixed to the first guide part or the second guide part; a plurality of wheels positioned below the wheel fixing plate; and a wheel height adjusting part for adjusting the height of the wheel fixing plate.

[0015] In addition, the wheel height adjustment unit may include a wheel height adjustment hole formed in the wheel fixing plate; a wheel height fixing screw fixed to the first guide unit and penetrating the wheel height adjustment hole; and a first wheel height fixing bolt coupled to the first wheel height fixing screw, wherein the wheel height adjustment hole may include upper and lower fixing holes extending in the vertical direction; and a plurality of height fixing holes extending forward or backward of the upper and lower fixing holes and each of which is formed at a different height.

[0016] In addition, the length adjustment part may include a contact plate positioned in close contact with the front surfaces of the first depth adjustment plate and the second depth adjustment plate; a first length adjustment hole formed by being long and left-right perforated in the first front plate; a first length fixing screw fixed by penetrating through the contact plate and the first length adjustment hole; a first length fixing bolt fastened to the first length fixing screw; a first washer part that is in close contact with the rear surface of the first front plate and is coupled to the first length fixing screw; a second length adjustment hole formed by being long and left-right perforated in the second front plate; a first length fixing screw fixed by penetrating through the contact plate and the second length adjustment hole; a first length fixing bolt fastened to the first length fixing screw; and a second washer part that is in close contact with the rear surface of the second front plate and is coupled to the second length fixing screw.

[0017] In addition, the depth adjustment unit may include at least one first depth fixing hole formed in the first depth adjustment plate or the second depth adjustment plate and formed in the shape of the letter 'ㅓ'; a depth fixing screw fixed to the first front plate or the second front plate and penetrating the depth fixing hole; and a depth fixing bolt coupled to the depth fixing screw.

[0018] In the past, scrapers of various sizes had to be prepared and used depending on the type of tile and the size of the work space. However, according to the above-described solution to the problem of the present invention, the tile adhesive application scraper of the present invention can adjust the depth of the notch through the depth adjustment part and the width length of the scraper through the width adjustment part, so that all work can be done with just one scraper of the present invention without having to prepare and carry around various scrapers, thereby reducing the purchase cost.

[0019] FIG. 1 is a perspective view of a scraper according to one embodiment of the present invention.

[0020] Figure 2 is a rear perspective view of a scraper according to one embodiment of the present invention.

[0021] Figures 3 and 4 are partially exploded perspective views of a scraper according to one embodiment of the present invention.

[0022] FIG. 5 is a drawing for explaining a depth adjustment unit of a scraper according to one embodiment of the present invention.

[0023] Figure 6 is a perspective view of a wheel portion of a scraper according to one embodiment of the present invention.

[0024] FIG. 7 is a drawing illustrating a wheel height adjustment hole according to one embodiment of the present invention.

[0025] Figure 8 is a drawing of a compression unit according to another embodiment of the present invention.

[0026] Fig. 9 is a drawing for explaining a compression unit according to one embodiment of the present invention.

[0027] Figure 10 is a photograph showing a conventional earthenware tool.

[0028] Below, with reference to the attached drawings, embodiments of the present invention are described in detail to facilitate easy implementation by those skilled in the art. However, the present invention can be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, irrelevant parts have been omitted for clarity, and similar reference numerals have been used throughout the specification to indicate similar elements.

[0029] Throughout this specification, when a part is said to be "connected" to another part, this includes not only cases where it is "directly connected" but also cases where it is "electrically connected" with another element in between.

[0030] Throughout this specification, when it is said that an element is “on” another element, this includes not only cases where the element is in contact with the other element, but also cases where another element exists between the two elements.

[0031] The present invention relates to a scraper (10) for applying tile adhesive. Specifically, the present invention relates to a scraper (10) that can be used to evenly apply cement or adhesive for bonding tiles to a floor and adjust the width and length of the scraper (10) according to the work situation.

[0032] FIG. 1 is a perspective view of a scraper (10) according to one embodiment of the present invention, FIG. 2 is a rear perspective view of a scraper (10) according to one embodiment of the present invention, FIGS. 3 and 4 are partially exploded perspective views of a scraper (10) according to one embodiment of the present invention, FIG. 5 is a drawing for explaining a depth adjustment unit (500) of a scraper (10) according to one embodiment of the present invention, FIG. 6 is a perspective view of a wheel unit (600) of a scraper (10) according to one embodiment of the present invention, FIG. 7 is a drawing illustrating a wheel height adjustment hole (631) according to one embodiment of the present invention, FIG. 8 is a drawing of a compression unit (700) according to another embodiment of the present invention, and FIG. 9 is a drawing for explaining a compression unit (700) according to one embodiment of the present invention.

[0033] Hereinafter, with reference to FIGS. 1 to 4, a scraper (10) for applying tile adhesive according to one embodiment of the present invention (hereinafter referred to as “scraper (10)”) will be described.

[0034] Referring to FIG. 1, the scraper (10) includes a front plate (100), a first guide portion (210), a second guide portion (220), a length adjustment portion (300), a depth adjustment plate (400), a depth adjustment portion (500), and a wheel portion (600).

[0035] The front plate has a first front plate (110) having a plurality of first notches (112) formed at the bottom thereof, and a second front plate (120) positioned so that at least a portion of one end of the first front plate (110) overlaps, and a plurality of second notches (122) formed at the bottom thereof.

[0036] The first guide portion (210) extends rearward from one end of the first front plate (110), and the second guide portion (220) extends rearward from the other end of the second front plate (120). The first guide portion (210) and the second guide portion (220) serve to prevent cement or adhesive from moving to the outside of the scraper (10) and to guide it from moving to the first notch (112) and the second notch (122).

[0037] The length adjustment unit (300) adjusts the length in the width direction of the front plate (100). Referring to FIGS. 1 and 2, the length adjustment unit (300) may include a contact plate (310), a first length adjustment hole (111), a first length fixing screw (320), a first length fixing bolt (330), a first washer portion (340), a second length adjustment hole (121), a second length fixing screw (350), a second length fixing bolt (360), and a second washer portion (370).

[0038] The contact plate (310) is positioned in close contact with the front surfaces of the first depth adjustment plate (410) and the second depth adjustment plate (420), and may be formed in a plate shape. In addition, the contact plate (310) has holes formed on both sides into which the first length fixing bolt (330) and the second length fixing bolt are inserted, and can pressurize the first front plate (110) and the second front plate (120) so that they do not move in the longitudinal direction.

[0039] The first length adjustment hole (111) may be formed by perforating the first front plate (110) in a longitudinal direction in the left and right directions. Referring to Fig. 3, the first length adjustment hole (111) is formed on the upper portion of the first front plate (110) and may have a height equal to the diameter of the first length fixing bolt (330).

[0040] The first length fixing screw (320) can be fixed by penetrating the contact plate (310) and the first length adjustment hole (111).

[0041] The first length fixing bolt (330) can be fastened to the first length fixing screw (320). By rotating the first length fixing bolt (330), the strength with which the contact plate (310) presses the first front plate (110) can be adjusted.

[0042] The first washer portion (340) is pressed against the rear surface of the first front plate (110) and can be coupled to the first length fixing screw (320). When the first length fixing bolt (330) is rotated and pressurized, the first washer portion (340) not only prevents the screw head of the first length fixing screw (320) from deforming the first front plate (110), but also has the effect of increasing the fixing strength by having one side of the first washer portion (340) pressed against the first front plate (110).

[0043] The second length adjustment hole (121) may be formed by perforating the second front plate (120) in a longitudinal direction in the left and right directions. Referring to Fig. 4, the second length adjustment hole (121) is formed on the upper portion of the second front plate (120) and may have a height equal to the diameter of the second length fixing bolt (360).

[0044] The second length fixing screw (350) can be fixed by penetrating the contact plate (310) and the second length adjustment hole (121).

[0045] The second length fixing bolt (360) can be fastened to the second length fixing screw (350). By rotating the second length fixing bolt (360), the strength with which the sealing plate (310) presses the second front plate (120) can be adjusted.

[0046] The second washer portion (370) is pressed against the rear surface of the second front plate (120) and can be coupled to the second length fixing screw (350). When the second length fixing bolt (360) is rotated and pressurized, the second washer portion (370) not only prevents the screw head of the second length fixing screw (350) from deforming the second front plate (120) but also has the effect of increasing the fixing strength by having one side of the second washer portion (370) pressed against the second front plate (120).

[0047] Below, a method for adjusting the length of the scraper (10) is described.

[0048] First, the first length fixing bolt (330) and the second length fixing bolt (360) are loosened, and the worker adjusts the overlapping length of the first front plate (110) and the second front plate (120) to a desired length, and then the first length fixing bolt (330) and the second length fixing bolt (360) are tightened so that the contact plate (310) presses the overlapping portion of the first front plate (110) and the second front plate (120), so that the scraper (10) can be fixed in the adjusted state in the length-adjusted state.

[0049] Referring again to FIG. 1, the depth adjustment plate (400) is coupled to the front of the first front plate (110) and includes a first depth adjustment plate (410) that adjusts the depth of the first notch (112) and a second depth adjustment plate (420) that is coupled to the front of the second front plate (120) and adjusts the depth of the second notch (122).

[0050] The first front plate (110) is formed in a plate shape, and the depth of the first notch (112) can be adjusted by being in close contact with the front surface of the first front plate (110) by the depth adjustment part (500).

[0051] The second front plate (120) is formed in a plate shape, and the depth of the second notch (122) can be adjusted by being in close contact with the front surface of the second front plate (120) by the depth adjustment unit (500).

[0052] For example, a level for measuring the horizontality of the scraper (10) may be positioned on the upper portion of the first front plate (110) and the second front plate (120), but is not limited thereto.

[0053] Hereinafter, with reference to FIG. 5, a depth control unit (500) according to one embodiment of the present invention will be described.

[0054] The depth adjustment unit (500) adjusts the depth of the first notch (112) and the second notch (122) by adjusting the position at which the depth adjustment plate (400) is coupled.

[0055] The depth adjustment unit (500) is formed in the first depth adjustment plate (410) or the second depth adjustment plate (420), and includes at least one depth fixing hole (510) formed in the shape of the letter 'ㅓ', a depth fixing screw (520) fixed to the first front plate (110) or the second front plate (120) and penetrating the depth fixing hole (510), and a depth fixing bolt (530) coupled to the depth fixing screw (520). The depth fixing hole (510) is formed in the shape of the letter 'ㅓ', so that the positions at which the first depth adjustment plate (410) and the second depth adjustment plate (420) cover the notch change depending on the position at which the depth fixing screw (520) is fixed, so that the depth of the notch can be adjusted. In other words, when the depth fixing screw (520) is located at the top of the depth fixing hole (510), the depth of the notch can be maximum, and when the depth fixing screw (520) is located at the bottom of the depth fixing hole (510), the depth of the notch can be minimum. In addition, the depth fixing hole (510) has a central hole extending in one direction in the center in addition to a hole extending in the vertical direction, so that when the depth fixing bolt (530) is located in the central hole, the first depth adjustment plate (410) and the second depth adjustment plate (420) can be fixed more stably.

[0056] When adjusting the depth of the notch, the worker loosely adjusts the depth fixing screw (520), and then slides the first depth adjustment plate (410) and the second depth adjustment plate (420) up and down, and when the depth of the notch desired by the worker is reached, the first depth adjustment plate (410) and the second depth adjustment plate (420) are fixed by tightening the depth fixing screw (520), so that the depth of the notch can be fixed in an adjusted state.

[0057] Hereinafter, with reference to FIGS. 6 and 7, a wheel part (600) according to one embodiment of the present invention will be described.

[0058] The wheel unit (600) is coupled to the first guide unit (210) and the second guide unit (220), respectively, and includes a wheel unit (600) having a plurality of wheels (620) provided at the bottom. Accordingly, the scraper (10) has the effect of being able to move smoothly through the wheel unit (600) during operation.

[0059] In the past, after completing the installation of the first row of tiles on the floor, when working on the tiles for the next row of tiles, a scraper was placed on the first row of tiles. In this case, the worker pushes the scraper (10) while the guide rails located on each side of the scraper (10) and the lower surface of the scraper (10) are in contact with the floor. At this time, since both the scraper (10) and the guide rail are made of a hard steel material, not only does the floor wear out due to friction with the sea surface, but the scraper (10) does not slide well, which increases worker fatigue and reduces work efficiency.

[0060] However, the present invention moves by means of wheel parts (600) located on each side of the scraper (10), and due to the presence of the wheel parts (600), the lower surface of the scraper (10) is located at a predetermined distance (about 4 mm) from the floor, so that the floor surface and the lower surface of the scraper do not come into contact with each other. Therefore, not only does it prevent the floor surface from wearing out, but it also has the effect of improving work efficiency by allowing the scraper to be pushed well.

[0061] In detail, the wheel unit (600) may include a wheel fixing plate (610) fixed to the first guide unit (210), a plurality of wheels (620) positioned below the wheel fixing plate (610), and a wheel height adjusting unit (630) for adjusting the height of the wheel fixing plate (610). The position at which the first notch (112) and the second notch (122) are spaced from the floor can be adjusted through the wheel height adjusting unit (630), and the worker can use the wheel by adjusting the height at which the first notch (112) and the second notch (122) are spaced from the floor according to the work environment.

[0062] The wheel height adjustment unit (630) may include a wheel height adjustment hole (631) formed in the wheel fixing plate (610), a wheel height fixing screw (632) fixed to the first guide unit (210) or the second guide unit (220), a wheel height fixing bolt (633) coupled to the wheel height fixing screw (632) penetrating the wheel height adjustment hole (631). Even if the first notch (112) and the second notch (122) are positioned at the highest positions within the wheel height adjustment unit (630), the wheel height adjustment unit (630) may be designed so that the lower surface of the scraper does not touch the floor.

[0063] When adjusting the height from the bottom of the first notch (112) and the second notch (122), loosen the wheel height fixing bolt (633), adjust the position of the wheel height fixing screw (632) in the wheel height adjustment hole (631) to adjust the height, and then tighten the wheel height fixing bolt (633) to fix the wheel part (600), so that the height can be fixed in an adjusted state.

[0064] In addition, the wheel height adjustment hole (631) may include an upper and lower fixing hole (631a) that extends in the vertical direction and a plurality of height fixing holes (632b) that extend forward or backward of the upper and lower fixing holes (631a) and are each formed at different heights. In other words, the worker fixes the wheel height fixing screw (632) at a desired position among the wheel (620) height fixing holes (632b) positioned in a direction perpendicular to gravity, and then tightens the wheel height fixing bolt (633) to fix the wheel portion (600), thereby having the effect of supporting the scraper (10) more stably.

[0065] For example, when working on the first row of tiles, the molding work is performed by positioning the wheel height fixing screw (632) in the height fixing hole (632b) located at the top, and when working on the second row of tiles, the wheel (620) in the wheel part (600) located at the top of the first row of tiles can be performed by positioning the wheel height fixing screw (632) in the upper, middle, or lowermost of the upper and lower fixing holes (631a) among the height fixing holes (632b) depending on the tile thickness.

[0066] Referring to FIGS. 2, 8, and 9, a compression unit (700) according to one embodiment of the present invention will be described.

[0067] Referring to FIG. 9, the scraper (10) may further include a pressing portion (700) that is fixed to the inner side of the first guide portion (210) and the inner side of the second guide portion (220), is positioned at a predetermined height from the floor, and has a cross-section formed by being bent in the shape of ' '. The pressing portion (700) serves to adhere the cement or adhesive to the floor before evenly applying the cement or adhesive using the first notch (112) and the second notch (122).

[0068] In the past, cement was applied to the rear of the scraper (10), and the worker pressed the cement with a trowel (see Fig. 10) to ensure that the cement adhered well to the floor. Then, the scraper (10) was manually pushed backward to perform the cement pressing work. However, there was a problem that the time required to collect the cement was long, which lowered the efficiency of the entire work process.

[0069] However, the present invention enables the scraper (10) work to be performed after the cement is pressed using the pressurizing unit (700) so that it does not float to the bottom, thereby omitting the process using a conventional trowel, and thus has the effect of significantly improving work efficiency.

[0070] In detail, referring to FIG. 9, the compression unit (700) includes a first compression unit (720) positioned spaced apart from the floor by a first distance, and a second compression unit (730) positioned spaced apart from the floor by a second distance shorter than the first distance. Accordingly, the cement or adhesive is primarily compressed by the first compression unit (720), and secondarily compressed by the second compression unit (730). In addition, when the scraper (10) is normally pushed in the direction of the cement, some of the cement passes under the compression unit (700), but due to the viscosity of the cement, the cement may be gathered in one place and overflow above the height of the compression unit (700), and thus the remaining portion of the cement may pass over the compression unit (700). Therefore, the cement or adhesive may be compressed thirdly by the load of the cement or adhesive introduced through the upper portion of the compression unit (700).

[0071] In addition, referring to FIG. 8, the pressing member (700) may include a plurality of adhesive passage holes (710) formed at positions corresponding to the grooves of the plurality of first notches (112) and the grooves of the second notches (122). Cement or adhesive can be evenly spread through the adhesive passage holes (710) in a shape similar to that in which the first notches (112) and the second notches (122) are formed, thereby making work easier.

[0072] The above description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0073] The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

Claims

1. In a scraper for cement pressing, A front plate portion configured in a predetermined flat shape with a plurality of notches formed at the bottom; A first guide portion and a second guide portion formed to extend rearwardly from one end and the other end of the front plate portion, respectively; and A scraper, wherein the two ends are respectively fixed to the inner side of the first guide part and the inner side of the second guide part to connect the first guide part and the second guide part, and the scraper includes a compression part positioned at a predetermined height from the floor to compression the cement when the scraper moves.

2. In paragraph 1, The above front plate portion, A first front plate having a plurality of first notches formed at a lower portion thereof, and a second front plate positioned so that at least a portion of one end of the first front plate overlaps, and having a plurality of second notches formed at a lower portion thereof, A scraper further comprising a length adjusting portion for adjusting the length in the width direction of the front plate.

3. In paragraph 2, The above scraper, A depth adjustment plate having a first depth adjustment plate coupled to the front of the first front plate and adjusting the depth of the first notch, and a second depth adjustment plate coupled to the front of the second front plate and adjusting the depth of the second notch; and A scraper further comprising a depth adjusting unit for adjusting the depth of the first and second notches by adjusting the position at which the depth adjusting plates are coupled.

4. In paragraph 3, The above scraper, It further includes a wheel part which is respectively connected to the first guide part and the second guide part and has a plurality of wheels provided at the bottom, A scraper that adjusts the length in the width direction of the front plate through the depth adjustment unit and adjusts the depth of the notch through the depth adjustment unit.

5. In paragraph 1, The above compression part has a cross section of ' A scraper formed by bending into a shape.

6. In paragraph 5, The above compression part A scraper comprising a plurality of adhesive passage holes formed at positions corresponding to the grooves of the plurality of notches.

7. In paragraph 4, The above wheel part A wheel fixing plate fixed to the first guide section; a plurality of wheels positioned at the lower portion of the wheel fixing plate; and A scraper further comprising a wheel height adjusting member for adjusting the height of the wheel fixing plate.

8. In paragraph 7, The above wheel height adjustment part A wheel height adjustment hole formed in the above wheel fixing plate; A wheel height fixing screw fixed to the first guide part or the second guide part and penetrating the wheel height adjustment hole; and Including a wheel height fixing bolt coupled to the first wheel height fixing screw; The above wheel height adjustment hole Upper and lower fixing holes formed to extend in the vertical direction; and A scraper comprising a plurality of height-fixing holes formed to extend forward or backward from the upper and lower fixing holes and each of which is formed at a different height.

9. In paragraph 2, The above length adjustment part A sealing plate positioned in close contact with the front surface of the first depth adjustment plate and the second depth adjustment plate; A first length adjustment hole formed by perforating the first front plate in a left-right direction; A first length fixing screw that is fixed by penetrating the above-mentioned sealing plate and the first length adjustment hole; A first length fixing bolt fastened to the first length fixing screw; A first washer portion that is in close contact with the rear surface of the first front plate and is coupled to the first length-fixing screw; A second length adjustment hole formed by perforating the second front plate in a left-right direction; A first length fixing screw that is fixed by penetrating the above-mentioned sealing plate and the above-mentioned two length adjustment holes; A first length fixing bolt fastened to the first length fixing screw; and A scraper comprising a second washer portion that is in close contact with the rear surface of the second front plate and is coupled to the second length-fixing screw.

10. In paragraph 3, The above depth adjustment part At least one depth fixing hole formed in the shape of the letter ‘ㅓ’ and formed on the first depth adjustment plate or the second depth adjustment plate; A depth fixing screw fixed to the first front plate or the second front plate and penetrating the depth fixing hole; and A scraper comprising a depth fixing bolt coupled to the depth fixing screw.

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