Construction tools

Abstract

To provide lightweight, inexpensive construction equipment with excellent handling properties, which has an easy-to-grip gripping part suitable for use in fixing a non-magnetic material to a soft magnetic material when the thickness of the non-magnetic material is 13 mm or less.SOLUTION: In construction equipment 1, two magnets 41, 42 are attached to both ends of a connecting yoke 60 via rising yokes 51, 52, respectively, and the rising yoke is made conical such that the area 5A of the top of the rising yoke is the same as the cross-sectional area 6A of the connecting yoke, thereby achieving weight reduction and forming a magnetic circuit that minimizes leakage of magnetic flux so as to ensure the required magnetic attraction force.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a construction tool for pressing a non-magnetic material against a soft magnetic material using magnetic force, and particularly to a construction tool that is suitable for construction of non-magnetic materials with a thickness of approximately 12.5 mm or less and has excellent handleability. [Background technology]

[0002] In the interior construction of buildings, it was common to screw non-magnetic materials such as gypsum board to wood or soft magnetic steel substrates. In this case, power was drawn via a cord and an electric drill was used for the work, which required a lot of preparation work and generated noise and dust.

[0003] On the other hand, when using adhesive to attach non-magnetic materials such as gypsum board to a base steel plate made of soft magnetic material, it was necessary to apply pressure by hand using body weight for a certain period of time. In this case, there was a lack of reliability because there was inconsistency in the work between individuals, and even within each task even if the same person was doing it.

[0004] In light of the above, Yoshino Gypsum Co., Ltd. has developed the "Smart JG Method" (registered trademark), which presses and bonds non-magnetic materials to soft magnetic materials. This method does not require electricity or drills, reducing the time and labor required for manual work, while eliminating the need for worker skill and uneven work, enabling accurate and reliable construction. The inventors have proposed a new construction tool specifically designed for this method, which generates pressing force using magnetic force. (Application number PCT / JP2022 / 048374)

[0005] On the other hand, the following Patent Document 1 proposes an application method including an application support tool for pressing an interior material against a metal substrate until the hot melt adhesive cools and hardens. The application support tool disclosed in this document utilizes the attractive force of a magnet on the substrate. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2002-294970 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0007] However, the construction tool proposed by the inventors described above was designed to be used on non-magnetic materials with a thickness of more than 40 mm, and therefore weighed more than 4 kg, making it difficult to handle. In addition, due to its strong magnetic attraction, careful attention was required to ensure safety during handling. Furthermore, the construction auxiliary tool disclosed in Patent Document 1 has a different purpose, effect, and configuration from the construction tool proposed by the present inventors.

[0008] Therefore, the present invention proposes a construction tool for attaching wall or ceiling panels with a thickness of 9mm to 13mm, which is a non-magnetic board that is frequently used, that is lightweight, has an easy-to-hold shape, and is inexpensive and achieves sufficient magnetic attraction force. [Means for solving the problem]

[0009] One aspect of the present invention is an installation tool for fixing a non-magnetic body to a soft magnetic body, in which a first magnet faces the bottom of a first rising yoke, a second magnet faces the bottom of a second rising yoke at a certain distance from the first magnet, a connecting yoke is arranged to connect the first rising yoke and the second rising yoke, and the first magnet and the second magnet are housed in a case body.In this installation tool, the area of ​​the bottoms of the first rising yoke and the second rising yoke is the same as the area of ​​the opposing magnet planes, and the cross-sectional area decreases from the bottom toward the connecting yoke, so that the area of ​​the tops in contact with the connecting yoke is the same as the cross-sectional area of ​​the connecting yoke.

[0010] The first magnet and the second magnet have different magnetic poles on the rising yoke side, and when installed, a magnetic circuit is formed in which the magnetic flux emitted from the first magnet flows sequentially through the first rising yoke, connecting yoke, second rising yoke, second magnet, soft magnetic material, and first magnet.

[0011] A space is provided surrounded by the first rising yoke, the joining yoke and the second rising yoke so that the joining yoke can be gripped by a human hand.

[0012] The sum of the thickness of the magnet and the height of the rising yoke is greater than the thickness of the non-magnetic material.

[0013] The gap between the first magnet and the second magnet is greater than the thickness of the non-magnetic body.

[0014] The area of ​​the top of each of the first and second rising yokes is 35% or more of the area of ​​the bottom of each of the first and second rising yokes.

[0015] The area of ​​the top of each of the first and second rising yokes is 50% or less of the area of ​​the bottom of each of the first and second rising yokes.

[0016] The cross-sectional area of ​​the connecting yoke is 490 square mm or more and 1000 square mm or less.

[0017] The magnet's magnetic pole surface area is between 1400 and 2000 square mm, and the magnet is a neodymium magnet with a thickness between 15 and 25 mm.

[0018] A sliding member was attached to the bottom of the case body. [Effects of the Invention]

[0019] According to the present invention, it is possible to construct a magnetic circuit that is lightweight, easy to grip, has excellent handling properties, has effective magnetic force as an application tool, is lightweight and inexpensive, and furthermore, keeps magnetic flux leakage within an acceptable range.In addition, it is easy to remove foreign matter such as magnetic powder that adheres to the application tool, and it is possible to prevent scratches from occurring on the surface of non-magnetic materials. [Brief explanation of the drawings]

[0020] [Figure 1] Perspective view of the installation tool [Figure 2] Front view of the installation tool [Figure 3]Side view of the installation tool [Figure 4] FIG. 1 is a diagram of a first embodiment. [Figure 5] FIG. 2 shows the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the scales and angles of components and the like shown in the accompanying drawings do not necessarily correspond to the actual objects, but have been adjusted to a size that is easy to clearly show.

[0022] An application tool 1 of the present invention will be described with reference to FIGS.

[0023] The construction tool 1 of the present invention is a construction tool for pressing a non-magnetic body against a soft magnetic body by magnetic force, and has a first magnet 41 and a second magnet 42 housed in a case body consisting of a case portion 31 and a cover portion 32, and has a first rising yoke 51, a second rising yoke 52, and a connecting yoke 60.

[0024] [Case body] The case body is a box made of a non-magnetic material such as aluminum, and includes a case portion 31 and a cover portion 32 . The case 31 is a rectangular parallelepiped-shaped, hollow body with holes, and has a first magnet 41 and a second magnet 42 built in on both sides in the longitudinal direction, as shown in Figure 1. The periphery of the case 31 is also provided with a plurality of screw holes (not shown). The cover part 32 is a lid that covers the top surface of the case part 31, and has countersunk holes at positions corresponding to the multiple screw holes of the case part 31, as well as countersunk holes in the center of the short side on both longitudinal sides that correspond to the screw holes of the rising yokes 51 and 52 described later.

[0025] 〔magnet〕 The magnets are block-shaped neodymium (Nd) magnets with a north pole on one side and a south pole on the other side. The magnets are housed at intervals in the case 31. The first magnet 41 is housed with its south pole facing the bottom, and the second magnet 42 is housed with its north pole facing the bottom.

[0026] [Handle] The handle portion has both the function of a grip that the worker holds during installation and the function of generating a magnetic circuit during installation, and is configured to connect the first rising yoke 51 and the second rising yoke 52 by bridging them with a connecting yoke 60. The first rising yoke 51 and the second rising yoke 52 are dense bodies in the shape of a truncated quadrangular pyramid, and have a screw insertion hole (not shown) at the center that penetrates in the thickness direction. The connecting yoke 60 is a dense body in the shape of a rectangular parallelepiped, and have screw holes (not shown) on both longitudinal sides in the thickness direction. The rising yokes 51, 52 and the connecting yoke 60 are all made of magnetic metal, such as ferritic stainless steel or steel.

[0027] [Assembly] The components shown above are assembled as follows. First, magnets 41 and 42 are housed in case 31. First magnet 41 is housed with its south pole facing the bottom, and second magnet 42 is housed with its north pole facing the bottom. Next, the cover part 32, the rising yokes 51 and 52, and the connecting yoke 60 are arranged in order from the bottom up so that the countersunk holes in the cover part 32, the insertion holes in the rising yokes 51 and 52, and the screw holes in the connecting yoke 60 are coaxial, and then a flat head bolt is inserted and fastened to the screw holes in the connecting yoke 60. Next, the countersunk holes in the cover part 32, in which the handle part is formed by the rising yokes 51, 52 and the connecting yoke 60, are aligned coaxially with the screw holes in the case part 31 housing the magnets 41, 42, and then a flat head screw is inserted to fasten the cover part 32 and the case part 31 together.

[0028] In the construction tool 1 assembled in this manner, the magnets 41 and 42 housed in the case body and the handle portion make the bottom surface of the case body a powerful magnetic acting surface. As shown in Figure 4, when the construction tool 1 is configured such that the non-magnetic body 110 is placed on the soft magnetic body 100 via the adhesive 120, the magnetically acting surface is placed facing the non-magnetic body 110 to form a magnetic circuit 20 through which magnetic flux passes smoothly in one direction, thereby generating a strong pressing force due to the magnetic force.

[0029] The first magnet 41, first rising yoke 51, connecting yoke 60, then second rising yoke 52, and second magnet 42 are magnetically connected in this order, allowing magnetic flux to pass smoothly in one direction. The distance L11 from the magnetic pole surface opposite the rising yoke side of magnet 41 or 42 to the connecting yoke 60 is set to be greater than the distance L2 from the magnetic pole surface to the soft magnetic material 100. Since magnetic flux emitted from the magnetic pole surface has the tendency to take the shortest route when passing through a non-magnetic material to reach a magnetic material, it will reach the soft magnetic material 100, which is closer, rather than the connecting yoke 60, which is farther away, and the magnetic circuit 20 can be formed. Furthermore, the distance L12 between the magnets 41 and 42 is set to be larger than the distance L2, so that the magnetic flux emitted from the magnetic pole surface reaches the soft magnetic material 100, which is closer, than the other magnet, which is farther away, and the magnetic circuit 20 can be formed. In a magnetic circuit that includes a non-magnetic material, the amount of magnetic flux that leaks out is greater than when the circuit is composed of only magnetic material. In this invention, however, "forming a magnetic circuit" refers to taking measures to minimize the amount of magnetic flux that leaks out.

[0030] With the above-described configuration, the magnetic flux required to generate the magnetic attraction force required during construction circulates between the construction tool 1 of the present invention and the soft magnetic material 100, completing the magnetic circuit 20.

[0031] Furthermore, there is no need to take the trouble of creating a handle for gripping during installation work with the installation tool 1. That is, the connecting yoke 60 is provided as a part to be gripped with the hand, and the rising yokes 51 and 52 provide a space into which the hand can be inserted.

[0032] Here, since the rising yokes 51 and 52 are paths that guide magnetic flux, the bottoms that face the magnetic pole surfaces of the magnets 41 and 42 must have a surface shape equivalent to that of the magnetic pole surfaces of the magnets 41 and 42, but the cross-sectional area becomes smaller toward the connecting yoke 60 and the tops come into contact with the connecting yoke 60. The magnet shape required to ensure the magnetic attraction force required for the present invention will be described later, but it was found that the magnetic circuit structure that guides the magnetic flux when this magnet is used can be made smaller in cross-sectional area to maintain sufficient magnetic attraction force even if some magnetic flux leakage occurs, so unnecessary yoke volume was reduced in order to make the construction tool 1 lighter.

[0033] After careful consideration of the ratio of the top area 5A to the bottom area of ​​the rising yokes 51, 52, it was found that a ratio of 35% or more keeps magnetic flux leakage within an acceptable range and ensures the minimum necessary magnetic attractive force, and that a ratio of 40% or more further reduces magnetic flux leakage and increases magnetic attractive force, but that above 50% magnetic flux leakage is further reduced but the magnetic attractive force becomes excessively strong. As a result, it was found that a ratio above 50% simply increases the weight of the construction tool 1 unnecessarily.

[0034] Similarly, the cross-sectional area 6A of the connecting yoke 60 is set to the minimum necessary, but in this case it is set to the same as the minimum cross-sectional area of ​​the rising yoke, i.e., the top area 5A of the rising yoke. This makes it possible to configure a magnetic circuit that keeps the leakage of magnetic flux passing through the yoke within an allowable range, ensuring the magnetic attraction force required for installation.

[0035] When using Nd magnets in the present invention, it is preferable that the area of ​​the magnetic pole surface is 1400 to 2000 square mm, and the thickness is 15 to 25 mm. In this case, the bottom area of ​​the rising yokes 51 and 52 is the same as the area of ​​the magnetic pole surface, 1400 to 2000 square mm, the top area 5A is 490 to 1000 square mm, and the cross-sectional area 6A of the connecting yoke 60 is also 490 to 1000 square mm.

[0036] As long as it has magnetic properties, materials other than neodymium magnets will do, but if, for example, an inexpensive sintered ferrite magnet is used, the magnet must be made larger to ensure magnetic functionality, which inevitably results in larger and heavier construction equipment. If an Nd magnet is used, the required functions can be achieved as long as the rising yoke and connecting yoke have the above-mentioned shapes.

[0037] The construction tool 1 of the present invention described above can be made lighter in weight, making it easier to handle and facilitating construction of ceiling materials, for example.

[0038] [First embodiment] FIG. 4 shows the application tool 1 of the first embodiment. The magnets used were two Ni-plated Nd magnets with a maximum energy product of 294.5 KJ / m 3 and a shape of 46 mm × 40 mm × 20 mm (magnetized in the 20 mm direction), which were designated as the first magnet 41 and the second magnet 42 .

[0039] The rising yokes 51 and 52 face the magnets 41 and 42, respectively, and their opposing bottoms are quadrilaterals measuring 46 mm x 40 mm with an area of ​​1840 square mm, and are 20 mm high and abut against the connecting yoke 60. Their abutting tops are quadrilaterals measuring 30 mm x 25 mm with an area of ​​750 square mm. Therefore, the top area in this embodiment is 40.8% of the bottom area.

[0040] The connecting yoke 60 has a width of 30 mm, a thickness of 25 mm, a cross-sectional area of ​​750 square mm, and a total length of 130 mm. The rising yokes 51 and 52 and the connecting yoke 60 are made of SUS416.

[0041] The space for inserting one's hand to grasp the coupling yoke 60 was 80 mm wide and 30 mm long, and when one inserted one's hand, one was able to firmly grasp the coupling yoke 60, which had a cross section of 30 mm x 25 mm. Furthermore, if the four corners of the connecting yoke 60 are rounded by R processing, the gripping ability can be further improved.

[0042] Furthermore, when the cross-sectional area 6A of the connecting yoke 60 of the installation tool 1 was changed using a soft magnetic material, adhesive, and non-magnetic material, as described below, installation was carried out. When the cross-sectional area 6A was 640 square mm or more, the magnetic attraction force, i.e., the pressing force, required to attach the gypsum board was obtained, and when it was 750 square mm or more, the magnetic attraction force was sufficient to safely attach the gypsum board. However, when it was larger than 920 square mm, the magnetic attraction force increased further and became more excessive than necessary, which simply increased the weight of the installation tool 1 unnecessarily. Based on this, the cross-sectional area 6A of the application tool 1 of this embodiment is set to 750 square mm (30 mm×25 mm).

[0043] The exposed adhesive side of the tape-like solid adhesive JG02, equivalent to Adhesive 120, was pressed against the surface of a soft magnetic steel plate (stud; JIS19 type CW-25 / manufactured by Sanyo Industries) with an actual measured thickness of 0.51 mm, equivalent to Soft Magnetic Material 100, and after pressing it with a special roller, the release paper on the other side (the side exposed on the surface) was peeled off.

[0044] Next, a gypsum board with a measured thickness of 12.6 mm, which corresponds to the non-magnetic material 110, was lightly pressed against the gypsum board, and the construction tool was then placed against the gypsum board from above. Since it was attracted to the soft magnetic steel plate, the construction tool 1 could be easily brought directly above the soft magnetic steel plate. Then, while keeping both magnets of the construction tool 1 above the soft magnetic steel plate (which is naturally maintained because they are magnetically attracted), the tool was slowly moved back and forth once, completing the construction.

[0045] The total weight of the construction tool 1 was about 1.8 kg, and it was easy to move and handle. In particular, when installing on a ceiling, it was easy to hold the installation tool 1 in one hand while climbing up a stepladder, and it was also easy to attach it to the ceiling and move it back and forth along the position of the soft magnetic steel plate.

[0046] Construction tool 1 is also effective for ceiling construction work that uses soft magnetic steel plates such as JIS19 type "CW-19 / Sanyo Industries" and "UL stud / Sanyo Industries." As mentioned above, the tape-type solid adhesive JG02 used in this construction is lightweight, easy to handle, and has a strong magnetic attraction to soft magnetic steel plates, so it can be pressed sufficiently against the soft magnetic steel plates and gypsum boards while resisting its own weight.

[0047] Immediately after installation, the gypsum board did not peel off or move. After leaving it for an hour, we tried to peel the gypsum board off the soft magnetic steel plate, but it did not come off. It was so firmly attached that if we applied more force, the gypsum board itself would crack.

[0048] [Second embodiment] FIG. 5 shows a second embodiment. A sliding sheet 70 (approximately 1 mm thick) made of synthetic fiber felt was attached to the entire magnetically acting surface of the application tool 1 used in the first embodiment. When application was performed in this state, the frictional force was significantly reduced, further improving handling.

[0049] Repeated application work can cause foreign matter to adhere to application tools. In particular, if the foreign matter is magnetic powder, it is strongly attracted to the magnetic force of the application tool, making it difficult to remove. Continuing application without removing the powder increases friction, reducing handling. In the worst case scenario, the gypsum board may be damaged. However, by using the sliding sheet of this embodiment, foreign matter such as magnetic powder can be easily removed simply by removing the sliding sheet, even if magnetic powder adheres to the board. In FIG. 5, a bag-shaped sliding sheet is attached, but a plate-shaped sliding sheet may also be attached with double-sided tape or the like.

[0050] Although the embodiments of the present invention have been described above, the embodiments disclosed above are merely examples, and the scope of the present invention is not limited to these embodiments. The scope of the present invention is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0051] The rising yokes 51, 52 and the connecting yoke 60 may be made of any soft magnetic material, but the SUS416 of the embodiment is the most suitable as it is expected to have anti-rust properties. In the embodiment, the case 31 and the cover 32 are made of aluminum, but any non-magnetic material may be used, such as resin. [Explanation of symbols]

[0052] 1 Construction equipment 20 Magnetic Circuit 31 Case part 32 Cover part 41 First Magnet 42 Second Magnet 51 First Rising Yoke 52 Second Rising Yoke 5A Top area of ​​rising yoke 60 Connecting Yoke 6A Cross-sectional area of ​​coupling yoke 70 Slippery Sheet 100 Soft magnetic material 110 Non-magnetic material 120 Adhesive

Claims

1. An installation tool for fixing a non-magnetic body to a soft magnetic body, wherein a first magnet faces the bottom of a first rising yoke, a second magnet faces the bottom of a second rising yoke at a certain distance from the first magnet, a connecting yoke is arranged to connect the first rising yoke and the second rising yoke, and the first magnet and the second magnet are housed in a case body, wherein the area of ​​the bottoms of the first rising yoke and the second rising yoke is the same as the area of ​​the opposing magnet planes, the cross-sectional area decreases from the bottom toward the connecting yoke, the area of ​​the tops that contact the connecting yoke is the same as the cross-sectional area of ​​the connecting yoke, and the areas of the tops of the first and second rising yokes are 35% or more and 50% or less of the area of ​​their respective bottoms.

2. 2. The construction tool according to claim 1, wherein the magnetic poles of the first magnet and the second magnet on the rising yoke side are different, and during construction, a magnetic circuit is formed in which the magnetic flux emitted from the first magnet flows sequentially through the first rising yoke, the connecting yoke, the second rising yoke, the second magnet, the soft magnetic material, and the first magnet.

3. 3. The installation tool according to claim 2, further comprising a space surrounded by the first rising yoke, the connecting yoke, and the second rising yoke so that the connecting yoke can be gripped by a human hand.

4. 4. The installation tool according to claim 3, wherein the cross-sectional area of ​​the connecting yoke is 490 square mm or more and 1000 square mm or less.

5. An installation tool as described in claim 4, wherein the first magnet and the second magnet have a magnetic pole surface area of ​​1,400 square mm or more and 2,000 square mm or less, and are Nd magnets with a thickness of 15 mm or more and 25 mm or less.

6. The installation tool according to claim 3, wherein a sliding member is attached to the bottom surface of the case body.

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