Construction auxiliary tool for construction tool

Abstract

To provide a construction auxiliary tool capable of improving work efficiency without using a step ladder and a scaffold base upon construction at an untouchable high place for a magnetic attractive type wall construction tool.SOLUTION: A construction auxiliary tool 3 for a construction tool 2 provided with a magnetic attractive part 10 having a magnetic attractive surface 16 on one side and a handle 30 disposed on a nonmagnetic attractive surface side of the magnetic attractive part 10, and used for construction to fix wall surface material 6 made of a nonmagnetic attractive body on a substrate steel member erected in a vertical direction through adhesive is configured to comprise a fixation member 40 detachably mounted on at least a part of the handle 30, and a rod member 50 parallel to the magnetic attractive surface 16 of the construction tool 2 on which the fixation member 40 is mounted with maximum length equal to 1 m or more hinged rotatably on the fixation member 40 around a horizontal axis of the construction tool 2 upon construction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a construction auxiliary tool for a construction tool, more specifically, to a construction auxiliary tool for use in a construction tool that includes a magnetically attracted portion having a magnetically attracted surface on one side and a handle provided on the non-magnetically attracted surface side of the magnetically attracted portion, and that fastens a wall material made of a non-magnetic material to a base steel material that is erected along a vertical direction via an adhesive. [Background technology]

[0002] In recent years, in the interior construction of buildings, it has been common to screw, for example, gypsum board (non-magnetic material) to the base steel plate (soft magnetic material) or wood. In this case, the work is done with an electric drill by drawing electricity with a cord, which is time-consuming to prepare and generates noise and dust.

[0003] In addition, when using a solid adhesive to attach a gypsum board to a steel plate, the solid adhesive part was pressed down with a special roller by applying the body weight of the worker for a certain period of time. In this case, there was unevenness (variation) in the work between individuals, and it was unreliable.

[0004] As an invention to solve the above problems, the present applicant developed the application tool described in Patent Document 1. This application tool comprises a magnetically attractive part having a magnetically attractive surface on one side, and a handle provided on the non-magnetically attractive side of the magnetically attractive part. Specifically, the application tool comprises a casing containing a powerful permanent magnet, and a handle attached to the top of the casing. The handle is made of a soft magnetic material, and also functions as a yoke for the permanent magnet inside the casing. With this construction tool, when a plasterboard is attached via a solid adhesive to a base steel plate installed vertically, instead of pressing it down manually as in the past, the magnetic attraction surface is placed facing the plasterboard, forming a magnetic circuit between the plasterboard and the base steel plate, thereby generating a strong pressing force via magnetic force. Interior work using the above-mentioned installation tool involves moving the tool vertically, while magnetically attached to a non-magnetic material, at several points on the gypsum board (where the underlying steel plate is located), from the top to near the floor surface. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication WO / 2023 / 127915 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0006] Incidentally, even in ordinary houses, the ceiling height is nearly 3m, and interior construction work using the above construction tools requires standing on a stepladder or scaffolding in areas close to the ceiling. In this case, there is a risk of slipping and falling off the stepladder or scaffolding, and it takes time and effort to go up and down each time and move to a different location. In addition, it is time-consuming to carry the stepladder or scaffolding to the site, which makes the work less efficient.

[0007] The present invention has been made in light of the above-mentioned circumstances, and has an object to provide a construction aid which is used to fasten a wall material made of a non-magnetic material via an adhesive to a base steel material installed in a vertical direction, the construction aid having a magnetically attractive portion with a magnetically attractive surface on one side and a handle provided on the non-magnetic surface side of the magnetically attractive portion, and which can increase work efficiency without the need for a stepladder or scaffolding. [Means for solving the problem]

[0008] The present invention takes the following measures to solve the above problems. Note that the reference characters in parentheses attached to each component means in this section (the "Means for Solving the Problems" section) are for reference purposes only to show the corresponding relationship with the specific means described in the embodiments described below, and do not limit the components of the present invention to these.

[0009] In one aspect of the present invention, a construction auxiliary tool (3, 3A) for a construction tool (2) that includes a magnetically attracted portion (10, 20) having a magnetically attracted surface (16) on one side and a handle (30) provided on the non-magnetically attracted surface side of the magnetically attracted portion (10, 20) and that performs construction to fix a wall material (6) made of a non-magnetic body to a base steel material (4) that is erected along a vertical direction via an adhesive (5) is characterized in that the construction auxiliary tool (3, 3A) includes a fixing member (40) that is detachably attached to at least a part of the handle (30), and a rod material (50) with a maximum length of 1 m or more that is parallel to the magnetically attracted surface (16) of the construction tool (2) to which the fixing member (40) is attached and is pivotally supported by the fixing member (40) so as to be rotatable about the horizontal axis of the construction tool (2) during construction. The non-magnetically attracted surface side refers to the side opposite to the magnetically attracted surface.

[0010] According to this embodiment, the bar (50) is configured to be parallel to the magnetically attracted surface (16) of the construction tool (2) to which the fixing member (40) is attached and to be rotatable about the horizontal axis of the construction tool (2) during construction. As a result, during construction work to fix the wall material (6) to the base steel material (4) at a high position, the worker can move the construction tool (1) magnetically held on the wall material (6) up and down by, for example, moving forward or backward relative to the wall material (6) while applying force to the grip end (51) of the bar (50) inclined at a predetermined angle (θ) from the vertical axis in the construction tool (1) magnetically held on the wall material (6). In addition, the burden on the worker can be reduced by the action of a moment determined by the product of the vertical component of the force (F) applied by the worker to the bar (50) and the horizontal distance (L1) between the grip end (51) of the bar (50) and the rotation axis (61).

[0011] In another embodiment of the present invention, the rod (50) is extendable and retractable and can be locked at a predetermined length, and when retracted to its shortest length, the length is between 20 cm and 50 cm.

[0012] According to this embodiment, the construction auxiliary tool (3) and the construction tool (2) having the construction auxiliary tool (3) attached thereto can be easily carried and stored.

[0013] In another aspect of the invention, the bar 50 and the fixed member 40 are made of a non-magnetic material.

[0014] According to this embodiment, it is possible to prevent the bar (50) and the fixing member (40) from being unexpectedly magnetically attached to the installation tool (2) and thus hindering the work.

[0015] In another aspect of the present invention, a generally U-shaped frame body (63A) is provided, both sides of which are pivotally supported by a fixing member (40) so as to be freely rotatable. The frame body (63A) is shaped and sized so that when the frame body (63A) is rotated with the fixing member (40) attached to at least a portion of the handle (30) of the construction tool (2), the frame body (63A) does not interfere with the construction tool (2), and only one rod (50) is attached to the non-pivot side of the frame body (63A).

[0016] According to this embodiment, since only one rod (50) is used, the manufacturing cost is low, and when the rod (50) is configured to be extendable, the labor required for extension is reduced. Effect of the Invention

[0017] According to the present invention, there is provided a construction aid which is equipped with a magnetically attractive portion having a magnetically attractive surface on one side and a handle provided on the non-magnetic surface side of the magnetically attractive portion, and which is used when fastening a wall material made of a non-magnetic material to a base steel material erected in the vertical direction via an adhesive, thereby eliminating the need to use a stepladder or scaffolding and thereby improving work efficiency. [Brief description of the drawings]

[0018] [Figure 1] 1 is a perspective view of the appearance of a construction tool 1 equipped with a construction auxiliary tool 3 according to the present invention. [Diagram 2] 2 is an external perspective view of a construction tool 2 to which a construction auxiliary tool 3 is attached. FIG. [Diagram 3] 2 is a diagram showing the shape of a construction tool 2 to which a construction auxiliary tool 3 is attached. FIG. [Figure 4] FIG. 2 is an external perspective view of the installation auxiliary tool 3. [Diagram 5]3A to 3C are diagrams showing the shape of an installation auxiliary tool 3. [Figure 6] 13 is a perspective view for explaining a method of using the construction tool 1 when the plaster board 6 is in an initial position P1. FIG. [Figure 7] 2 is a side cross-sectional view showing a magnetic circuit MF formed between the construction tool 1 and a steel frame 4. FIG. [Figure 8] 1A to 1C are side views for explaining a method of using the application tool 1 in chronological order. [Figure 9] 10 is a side view for explaining a force acting when the installation tool 1 is used for installation in an upper position. FIG. [Figure 10] FIG. 13 is an external perspective view showing a modified example of an installation auxiliary tool 3A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the scale and angles of the components and the like shown in the accompanying drawings do not necessarily correspond to the actual ones, and have been appropriately adjusted to a size that is easy to clearly show.

[0020] FIG. 1 is an external perspective view of a construction tool 2 equipped with a construction auxiliary tool 3 according to the present invention, and FIG. 2 is an external perspective view of the construction tool 2 to which the construction auxiliary tool 3 is to be attached. FIG. 3 is a diagram showing the shape of the construction tool 2 to which the construction auxiliary tool 3 is to be attached, where (a) is a front cross-sectional view (cross-sectional view of line A-A in FIG. 2), (b) is a plan view, and (c) is a side view. FIG. 4 is an external perspective view of the construction auxiliary tool 3, where (a) is a view seen from the diagonal front, and (b) is a view seen from the diagonal rear. FIG. 5 is a diagram showing the shape of the construction auxiliary tool 3, where (a) is a front view, (b) is a plan view with a part cut away, and (c) is a side view with a part cut away. The reference numeral for the construction tool is "2" when the construction tool is regarded as a single unit without the construction auxiliary tool 3 attached, and "1" when the construction tool is regarded as a composite unit with the construction auxiliary tool 3 attached.

[0021] As shown in Figure 1, the construction tool 1 has a construction tool 2 and a construction auxiliary tool 3. The construction auxiliary tool 3 can be attached and detached freely from the construction tool 2 without using any tools. The construction tool 2 is a tool used when constructing (fixing) a gypsum board 6 to a steel frame 4 via a special adhesive 5, as shown in Figure 6 described later.

[0022] As shown in FIGS. 2 and 3, the installation tool 2 includes a casing 10, a pair of permanent magnets 20, 20 arranged inside the casing 10, and a handle 30 provided integrally with the casing 10 on the upper part of the casing 10.

[0023] [Casing] The casing 10 is a hollow rectangular box made of a non-magnetic material such as aluminum or synthetic resin, and as shown in Fig. 3, comprises a box-shaped casing body 11 with an open top, and a lid 12 that closes the opening of the casing body 11. The lid 12 has bolt holes 121 that penetrate in the thickness direction on both sides in the longitudinal direction, and screw holes 122 at the four corners. The wall thickness of the casing body 11 and the lid 12 is set to a thickness that allows sufficient penetration of the magnetic flux of the internal permanent magnet 20, for example, about 1 to 3 mm.

[0024] [Permanent magnet] The permanent magnets 20 are made of block-shaped neodymium magnets with a north pole on one side and a south pole on the opposite side, and with a bolt hole 21 that penetrates through the thickness direction in the center. The permanent magnets 20 are arranged symmetrically on both sides in the longitudinal direction within the casing body 11, with a gap between them. One permanent magnet 20 is fixedly arranged with its north pole facing the bottom, and the other permanent magnet 20 is fixedly arranged with its south pole facing the bottom.

[0025] 〔handle〕 The handle 30 has two base yokes 31, 31 and a connecting yoke 32. The base yoke 31 is a block-shaped dense body with a bolt hole 311 at the center that penetrates in the thickness direction. The connecting yoke 32 is a rectangular parallelepiped dense body with bolt holes 321, 321 that penetrate in the thickness direction on both longitudinal sides. Both are made of a magnetic metal, for example, ferritic stainless steel SUS434 or steel. The handle 30 is configured by connecting two base yokes 31, 31 with a connecting yoke 32. Specifically, the connecting yoke 32 connects the two base yokes 31, 31 arranged at a distance from each other in a bridging manner, and its shape when viewed from the front is a U-shape rotated 90 degrees counterclockwise.

[0026] The components shown above are arranged on both the left and right sides in the order of permanent magnet 20, cover 12, base yoke 31, and connecting yoke 32 from the bottom, so that the bolt holes 21, 121, 311, and 321 are coaxial, and then countersunk bolts 14 are inserted into the bolt holes and fastened with nuts 15. The cover 12 is then fixed to a screw hole (not shown) in the casing body 11 with a screw 13 inserted into a screw hole 122 in the cover 12 to complete the assembly. The main body 2 assembled in this manner has the bottom surface of the casing 10 serving as a strong magnetic attraction surface 16 due to the permanent magnets 20, 20 inside the casing 10.

[0027] [Construction aids] The installation support tool 3 includes a fixing bracket 40, extendable rods 50, 50, and connecting members 60, 60, as shown in FIGS.

[0028] [Fixing bracket] The fixing bracket 40 is configured so as to be detachably fixed to the base yoke 31 of the installation tool 2 without tools, and has a frame body 41, an opening / closing door 42, and a fastener 43 (restraint band).

[0029] The frame 41 is made of a non-magnetic metal such as aluminum and has a U-shape in plan view, and includes a bottom plate 411 and a pair of left and right side plates 412. The side plates 412 are formed to extend at right angles in the same direction from both ends of the bottom plate 411. Inside the frame 41, a rectangular parallelepiped space S1 (see FIG. 5(b)) is formed that is sized to fit into one of the base yokes 31 of the construction tool 2. A central hole 412h through which the flat bolt 61 is inserted is formed in the center of the side plate 412.

[0030] The opening and closing door 42 is a plate-like body of approximately the same size as the bottom plate 411, and is made of a non-magnetic metal such as aluminum like the frame body 41, and is attached to the end of one of the side plates 412 via a hinge 44 so as to be rotatable 270 degrees around a hinge shaft 441. This allows the entrance S2 of the space S1 to be selectively positioned between an open state (see the dashed line in FIG. 5(b)) and a closed state (see the solid line in FIG. 5(b)).

[0031] The fastener 43 is a member for fixing the opening / closing door 42 in the closed state in this position, and includes a flexible band 431 and male hooks 432, 432 provided on both longitudinal sides of the band 431. Meanwhile, near the end of the side panel 412 not connected to the hinge 44 and near the end of the opening / closing door 42 not connected to the hinge 44, there are female hooks (not shown) that can fit into the male hooks 432, 432 of the fastener 43, respectively.

[0032] [Telescopic rod] The telescopic rod 50 is constructed by nesting a number of hollow round bars of different diameters, and each round bar can be locked at any or a predetermined length (at its longest position). The locking mechanism can be, for example, as disclosed in Japanese Utility Model Publication No. 60-45907, a locking device in which a ring-shaped body having a cylindrical hole with a center slightly offset from the center is rotatably fitted into the cylindrical part and fixed to the end of a small pipe (the inner round bar), or a well-known mechanism is used, such as a taper surface in which the inner circumferential surface of the lower end region of the inner round bar is made larger toward the bottom within a range in which the inner circumferential surface of the outer round bar can be inserted, except for the upper part, and the diameter of the inner circumferential surface of the upper part of the outer round bar is made smaller so as to abut against the taper surface. The round bar is made of a non-magnetic metal such as aluminum or a synthetic resin, and the maximum length when extended is 1 m or more and 2.5 m or less. This is the length that can reach the ceiling height of an ordinary house when held by an operator. The minimum length when contracted is, for example, 20 cm to 50 cm. By setting the minimum length within this range, it becomes easy to carry and store. One end of the telescopic rod 50 is fixed to the tip region of a connecting arm 63 (described below) by welding or screwing, and the other end forms a grip end 51 with a non-slip surface for an operator to grip.

[0033] [Connection mechanism] The connecting mechanism 60 is a mechanism that supports the telescopic rod 50 in the center of the pair of side plates 412 so that it can rotate freely around an axis perpendicular to each surface, and specifically has a flat bolt 61, a nut 62, a connecting arm 63, and a lock nut 64. The flat bolt 61 is inserted into a central hole 412 h of the side plate 412 and is fastened to the side plate 412 by a nut 62 . The connecting arm 63 has a rectangular shape and has a loose hole 63h at one end, through which the shaft of the flat bolt 61 is rotatably inserted. It is made of a non-magnetic metal such as aluminum. The other end is fixed to the tip region of the telescopic rod 50 by welding or screwing. The lock nut 64 is screwed onto the tip of the flat bolt 61 inserted into the loose hole 63h of the connecting arm 63, and prevents the connecting arm 63 from falling off the flat bolt 61. As a result, the two extendable rods 50 provided symmetrically on the left and right are provided on the pair of side plates 412 so as to be able to rotate independently.

[0034] The telescopic rod 50 and the connecting arm 63 are made of non-magnetic material for the following reason: The magnetic attraction surface 16 of the construction tool 2 generates a very strong magnetic force, and magnetic lines of force are also emitted around the casing 10, so that the telescopic rod 50 and the connecting arm 63 will not be unexpectedly attracted to the magnet and interfere with the work.

[0035] [Attaching construction auxiliary tools to construction equipment] The following describes how to attach the construction auxiliary tool 3 to the construction tool 2. When attaching the construction auxiliary tool 3, it is preferable to keep the telescopic rod 50 at a minimum length in terms of ease of operation. First, the opening and closing door 42 of the fixing bracket 40 of the installation auxiliary tool 3 is opened (see the dashed line in FIG. 5(b)). Next, the installation tool 2 is placed on an appropriate flat surface, and with the opening entrance S2 of the fixing bracket 40 facing one of the base yokes 31 of the installation tool 2, the fixing bracket 40 is moved to the base yoke 31 and the base yoke 31 is fitted into the space S1. Next, the opening / closing door 42 is closed and fixed by the fastener 43. That is, one male hook 432 of the fastener 43 is engaged with the female hook of the side plate 412 of the fixing bracket 40, and the other male hook 432 of the fastener 43 is engaged with the female hook of the opening / closing door 42, thereby fixing the fixing bracket 40 to the base yoke 31.

[0036] Next, a method of using the application tool 1 will be described. [Construction work] Figure 6 is an oblique view for explaining how to use the construction tool 1 at the initial position P1 of the gypsum board 6, Figure 7 is a side cross-sectional view showing the magnetic circuit MF formed between the construction tool 1 and the steel frame 4, and Figure 8 is a side view for explaining how to use the construction tool 1 in chronological order.

[0037] Specifically, the work described below involves attaching a plasterboard 6, which is a non-magnetic material, to a steel frame 4, which is the base steel material, using a special adhesive 5. This special adhesive 5 is an adhesive that has the property of increasing its adhesive strength in a short period of time when a certain pressure is applied, and in this case, it is a double-sided adhesive tape type.

[0038] First, as shown in Fig. 6(a), a worker places a plasterboard 6 on a steel frame 4 with a special adhesive 5 applied to its surface. This causes the plasterboard 6 to adhere to the special adhesive 5, and the plasterboard 6 is temporarily attached to the steel frame 4 as shown in Fig. 6(b).

[0039] In this temporarily fixed state, the installation tool 1 is prepared. At this time, both of the telescopic rods 50 are set to the shortest or shortest length (see FIG. 8(a)). Next, as shown in FIG. 6(c), the magnetic attraction surface 16 of the construction tool 1 is brought close to the gypsum board 6 and placed on the surface of the gypsum board 6 where the steel frame 4 is present. The height at which it is placed is within the reach of the worker, and in this description, this position is set as the initial position P1. At this time, as shown in FIG. 7, one permanent magnet 20 of the construction tool 1, one base yoke 31, the connecting yoke 32, the other base yoke 31, the other permanent magnet 20, and the steel frame 4 form a magnetic circuit MF through which a magnetic flux with a high magnetic flux density passes. This magnetic circuit has the thickness of the gypsum board 6 as an air gap. As a result, the construction tool 1 is magnetically attracted to the steel frame 4 with a large force, and the gypsum board 6 can be pressed against the steel frame 4 with a strong pressing force.

[0040] In this state, the worker holds the handle 30 and moves the construction tool 1 downward as shown by the arrow in Fig. 6(c). This causes the area where the construction tool 1 presses the gypsum board 6 against the steel frame 4 to move along the steel frame 4 (see the downward arrow in Fig. 8(a)). As a result, the part of the gypsum board 6 that faces the steel frame 4 via the special adhesive 5 is pressed with an even strong pressure, and by moving it to the lowest position P2, the lower half of the gypsum board 6 is permanently attached to one steel frame 4 by the special adhesive 5.

[0041] After that, the worker holds the handle 30 and moves the construction tool 1 from the lowest position P2 to the initial position P1 (see the upward arrow in FIG. 8(a)). In other words, the construction tool 1 is raised so that it follows the above-mentioned downward path as a return path. This ensures that the lower half of the gypsum board 6 is attached to the steel frame 4.

[0042] With the installation tool 1 placed at the initial position P1, the worker extends and locks the two telescopic rods 50 to their maximum length (see FIG. 8(b)). At this time, for example, the worker holds the grip end 51 of each telescopic rod 50 with both hands and, facing the wall, retreats from the wall so that the angle θ between the two telescopic rods 50 and the vertical axis is 30 degrees to 70 degrees, preferably 40 degrees to 60 degrees (see the solid line in FIG. 8(c)). This operation is possible because the telescopic rods 50 are supported by the pair of side plates 412 via the connecting mechanism 60 so as to be rotatable about axes perpendicular to the respective faces. Next, the worker advances toward the wall surface and pushes the telescopic rod 50 upward in the longitudinal direction (see the dashed line in FIG. 8(c)). The vertical component of this pushing force serves to raise the construction tool 1, and the construction tool 1 rises vertically upward from the initial position P1 while pressing against the wall surface of the plasterboard 6 by magnetic force. As a result, the upper half of the plasterboard 6 is permanently attached to one steel frame 4 by the special adhesive 5. Note that the two telescopic rods 50 can be rotated independently, so that it is possible to set the left and right to different angles θ. It is also possible to change the way force is applied to the left and right telescopic rods 50. This allows for subtle trajectory corrections on the plasterboard 6.

[0043] When the construction tool 1 reaches the uppermost position P3, the worker stops pushing it up (see FIG. 8(d)) and then performs the reverse operation. That is, the worker retreats while pulling the telescopic rod 50 forward in its longitudinal direction (see the solid line in FIG. 8(e)). The vertical component of this pulling force acts as a force to lower the construction tool 1, and the construction tool 1 descends vertically down the wall surface to the initial position P1 (see the dashed line in FIG. 8(e)). By carrying out the above steps, the fastening work in areas that are out of reach is completed, and the construction work for one steel frame 4 is completed.

[0044] Thereafter, the gypsum board 6 is pressed down against the steel frame 4 adjacent to the one to which the gypsum board 6 has been permanently attached. By repeating this process, the gypsum board 6 is attached to the steel frame 4. As a result, the gypsum board 6 is permanently attached to the entire steel frame 4 with the special adhesive 5.

[0045] In this way, with the construction tool 1 equipped with the auxiliary tool 3, fastening work in hard-to-reach areas can be accomplished by pushing up and pulling down the extended telescopic rod 50, eliminating the need to use a stepladder or scaffolding and improving work efficiency. In addition, the auxiliary tool 3 can be attached and detached to the existing construction tool 2 without tools, so the functionality can be enhanced without changing the structure of the existing construction tool 2.

[0046] Here, the forces acting during installation at an upper position above the gypsum board 6 will be described with reference to Fig. 9. Fig. 9 is a side view for explaining the forces acting during installation at an upper position above the gypsum board 6 using the installation tool 1, where (a) shows the installation tool 1 being pushed up and (b) shows the installation tool 1 being pulled down. As shown in FIG. 9(a), when the telescopic rod 50 of the installation tool 1 is tilted at an angle θ with respect to the vertical line and the grip end 51 is gripped and the telescopic rod 50 is pushed up in the direction of the telescopic rod 50 with a force F, the vertical force component F1 acting on this system is expressed by the following equation (1). F1=F×cosθ-(WR)=F×cosθ-(W-μ×Q)...(1) Here, W is the load of the construction tool 1, μ is the friction coefficient between the magnetic attraction surface 16 of the construction tool 1 and the gypsum board 6, and Q is the magnetic attraction force acting between the steel frame 4 and the magnetic attraction surface 16 of the construction tool 1.

[0047] In formula (1), the value of (WR) is extremely small because the construction tool 1 is strongly magnetically attached to the gypsum board 6. Therefore, most of the vertical component of the force applied by the worker, F×cosθ, is used as an upward force. Moreover, the lateral force component F2 acting on this system is expressed by the following equation (2). F2 = Q + F × sinθ (2) In other words, when pushing up, a greater pressing force can be obtained compared to when working by holding the handle. In addition, the horizontal distance L1 between the flat bolt 61, which is the rotation center of the telescopic rod 50, and the grip end 51 of the telescopic rod 50, L×sinθ, is the arm length of the vertical force F1, and a moment M1 acts according to the principle of leverage. The moment M1 is expressed by the following formula (3). M1=F×cosθ×L×sinθ=F×L×sinθ×cosθ=F×L×sin(2θ) / 2...(3) Here, the value of sin(2θ) is between 0 and 1 when θ is between 0 and 90 degrees, and is particularly between 0.278 and 1 when θ is between 15 and 75 degrees, and between 0.433 and 1 when θ is between 30 and 60 degrees. Therefore, in order to effectively utilize the effect of the moment, it is preferable that θ is about 30 to 60 degrees, where a relatively large coefficient value can be obtained.

[0048] Furthermore, as shown in FIG. 9(b), when the telescopic rod 50 of the installation tool 1 is pulled down by a force F while the telescopic rod 50 is inclined at an angle θ with respect to the vertical line, the vertical force component F3 acting on this system is expressed by the following equation (4). F3=-F×cosθ-(WR)=-F×cosθ-(W-μ×Q)...(4) F3 is the force used to lower the construction tool 1. Moreover, the lateral force component F4 acting on this system is expressed by the following equation (5). F4 = QF × sinθ (5) In other words, when pulling down, only a small pushing force is obtained compared to when holding the handle. However, since a large pushing force is obtained when pushing up, this does not pose a problem.

[0049] In addition, the horizontal distance L1 between the flat bolt 61, which is the rotation center of the telescopic rod 50, and the grip end 51 of the telescopic rod 50, L×sinθ, becomes the arm length of the vertical force F3, and a moment M2 acts according to the principle of leverage. The moment M2 is expressed by the following formula (6). M2=-F×cosθ×L×sinθ=-F×L×sinθ×cosθ=-F×L×sin(2θ) / 2...(6) Here, the value of sin(2θ) is between 0 and 1 when θ is between 0 and 90 degrees, and is particularly between 0.278 and 1 when θ is between 15 and 75 degrees, and between 0.433 and 1 when θ is between 30 and 60 degrees. Therefore, in order to effectively utilize the effect of the moment, it is preferable that θ is about 30 to 60 degrees, where a relatively large coefficient value can be obtained.

[0050] That is, during construction work to attach a plasterboard 6 to a steel frame 4 at a high position, a worker can move the construction tool 1 vertically by applying force to the grip end 51 of the telescopic rod 50 inclined at an angle θ from the vertical axis in the construction tool 1 magnetically held to the plasterboard 6, and moving it forward or backward relative to the plasterboard 6. In addition, the burden on the worker can be reduced by the action of a moment determined by the product of the vertical component of the force F (or -F) applied by the worker to the telescopic rod 50 and L×sinθ, which is the horizontal distance L1 between the grip end 51 of the telescopic rod 50 and the rotation axis 61.

[0051] [Modifications] FIG. 10 is a perspective view showing the appearance of a modified construction support tool 3A. The installation support tool 3A has only one extendable rod 50, which is attached to the fixing bracket 40 via an arm frame 63A so as to be freely rotatable in the same manner as in the original form.

[0052] The arm frame 63A has arm side plates 631A arranged opposite to each other and a connecting plate 632 connecting the two arm side plates 631A at their ends, and is a frame body having a substantially U-shaped space S3 on the inside, and the ends of each arm side plate 631A are rotatably supported by each side plate 412 of the fixing bracket 40. The space S3 is set to be large enough that the arm frame 63A does not interfere with the construction tool 2 when the arm frame 63A is rotated with the fixing bracket 40 attached to one base yoke 31 of the construction tool 2. One extendable rod 50 is attached to the connecting plate 632 in the opposite direction to the arm side plate 631A at the center position of the connecting plate 632. The construction method using the construction tool equipped with the construction auxiliary tool 3A is basically the same as that shown in FIG. The construction aid 3A has only one telescopic rod 50, which reduces the effort required for telescopic operation and reduces manufacturing costs.

[0053] 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 indicated by the description of the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. In other words, the structure, shape, material, number, mounting position, application, etc. of the entire or part of the installation auxiliary tool 3, 3A can be appropriately changed in accordance with the spirit of the present invention.

[0054] For example, in the above embodiment, the fixing metal fitting 40 is fixed to one of the base yokes 31 of the construction tool 2, but it may be fixed to the connecting yoke 32 or the entire handle 30. In addition, as an example of use of the construction tool 1, a case has been shown in which a wall material made of a non-magnetic material is fixed to a base steel material erected in a vertical direction using a special adhesive, but it can also be applied to a case in which a ceiling material, for example, made of a non-magnetic material is fixed to a base steel material erected in a horizontal direction using a special adhesive. [Industrial Applicability]

[0055] This construction tool has a magnetically adhesive part with a magnetically adhesive surface on one side and a handle provided on the non-magnetically adhesive side of the magnetically adhesive part, and is used to attach a wall material made of a non-magnetic material to a base steel material that is erected in the vertical direction via an adhesive.When working at high places that are difficult to reach, it is not necessary to use a stepladder or scaffolding, and this can be widely used as a construction auxiliary tool for the construction tool, thereby increasing work efficiency. [Explanation of symbols]

[0056] 1 Construction equipment 2 Construction equipment 3 Construction aids 3A Construction aids 4 Steel frame (base steel material) 5 Special adhesive (adhesive) 6. Gypsum board (wall material) 10 Casing (magnetic attraction part) 16 Magnetic attraction surface 20 Permanent magnet (magnetic attraction part) 30 Handle 40 Fixture (fixing member) 50 Telescopic Rod (Bar)

Claims

1. This construction auxiliary tool for a construction tool has a magnetic attraction section having a magnetic attraction surface on one side and a handle provided on the non-magnetic attraction side of the magnetic attraction section, and is used to attach a wall material made of a non-magnetic material to a base steel material installed vertically via an adhesive, characterized in that it has a fixing member that is removably attached to at least a part of the handle, and a rod material with a maximum length of 1 m or more that is parallel to the magnetic attraction surface of the construction tool to which the fixing member is attached and is journalled by the fixing member so as to be rotatable around the horizontal axis of the construction tool during construction.

2. 2. The construction auxiliary tool for a construction tool according to claim 1, wherein the rod is extendable and retractable and can be locked at a predetermined length, and the length when contracted to its shortest length is 20 cm to 50 cm.

3. 3. The construction aid for a construction tool according to claim 1, wherein the rod and the fixing member are made of a non-magnetic material.

4. 2. A construction auxiliary device for a construction tool as described in claim 1, which has an approximately U-shaped frame body whose both sides are supported by a fixed member so as to be freely rotatable, and the frame body has a shape and size such that it does not interfere with the construction tool when the frame body is rotated with the fixed member attached to at least a part of the handle of the construction tool, and only one rod material is attached to the non-supported side of the frame body.

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