Attaching and detaching instrument and detaching method

Abstract

To provide an attaching / detaching tool and a detaching method capable of easily detaching or attaching a ceiling board of a system ceiling.SOLUTION: The attaching and detaching tool is a tool for attaching and detaching the ceiling board to and from the structural material of the system ceiling, and includes a handle portion gripped by a worker, a plate receiving portion that supports the ceiling board so as not to move relative to the ceiling board when the ceiling board is attached and detached, a shaft portion that connects the handle portion and the plate receiving portion and supports a load of the plate receiving portion, and an inclined portion that is provided in the shaft portion and is capable of changing an angle of the plate receiving portion with respect to the shaft portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a ceiling board attachment / detachment tool for a system ceiling and a ceiling board removal method. [Background technology]

[0002] Patent Document 1 discloses a lifting device that lifts a board up to the ceiling surface when attaching it to a typical ceiling. The lifting device lifts the board to a position where it is to be attached to a panel, which is a structural member. A worker then aligns the board and fixes it to the ceiling panel by driving screws or the like from the underside of the board. The lifting device can improve the workability of such work. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-020813 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, in addition to the ceiling described in Patent Document 1, system ceilings have been increasingly installed. In system ceilings, the ceiling surface is formed by placing ceiling boards, ceiling-installed equipment, etc., into holes formed in a framework of aggregates, which is a structural body. When attaching or detaching a ceiling board, a worker must pass the ceiling board through the holes in the framework while holding the ceiling board at an angle. However, with the lifting device described in Patent Document 1, it is difficult to pass the ceiling board through the holes in the framework.

[0005] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide an attachment / detachment tool and an attachment method that can easily attach or detach ceiling boards of a system ceiling. [Means for solving the problem]

[0006] The attachment / detachment tool according to the present disclosure is a tool for attaching and detaching ceiling boards to and from the framework of a system ceiling, and includes a handle portion to be held by an operator, a plate receiving portion that supports the ceiling board so that it does not move relative to the ceiling board when the ceiling board is attached or detached, a shaft portion that connects the handle portion and the plate receiving portion and supports the load of the plate receiving portion, and an inclined portion that is provided on the shaft portion and can change the angle of the plate receiving portion relative to the shaft portion.

[0007] The removal method according to the present disclosure is a method for removing a ceiling board from a framework of a system ceiling using an attachment / detachment tool, the attachment / detachment tool comprising: a handle portion to be held by an operator; a plate receiving portion that supports the ceiling board so that it does not move relative to the ceiling board when the ceiling board is attached or detached; a shaft portion that connects the handle portion and the plate receiving portion and supports the load of the plate receiving portion; and a tilting portion that is provided on the shaft portion and can change the angle of the plate receiving portion relative to the shaft. The removal method comprises: a lifting process in which the ceiling board attached to the framework is supported by the plate receiving portion and lifted upward; a tilting process that is performed after the lifting process, in which the ceiling board is rotated in a horizontal plane by rotating the handle portion and the angle of the plate receiving portion is changed by the tilting portion to tilt the ceiling board relative to the horizontal plane; and a lowering process that is performed after the tilting process, in which the handle portion is lowered and passed through a hole in the frame body of the framework to move the ceiling board from the top to the bottom of the framework. [Effects of the Invention]

[0008] According to the present disclosure, ceiling boards of a system ceiling can be easily removed or installed. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a system ceiling to which an attachment / detachment tool according to a first embodiment is applied, viewed from below. [Figure 2] 1 is a perspective view of a ceiling board to which an attachment / detachment tool according to a first embodiment is applied. [Figure 3] FIG. 2 is a perspective view of the attachment / detachment tool according to the first embodiment. [Figure 4] 3 is a diagram showing a shaft portion of the attachment / detachment tool in the first embodiment. FIG. [Figure 5] 1 is a simplified perspective view of an attachment / detachment tool according to a first embodiment. FIG. [Figure 6] 10A and 10B are diagrams showing another example of the distal end member of the attachment / detachment tool in the first embodiment. [Figure 7] 2 is a perspective view of a drive mechanism of the attachment / detachment tool according to the first embodiment. FIG. [Figure 8] 1 is a top view of a main part of the attachment / detachment tool according to the first embodiment. FIG. [Figure 9] 3 is a diagram showing a handle of the attachment / detachment tool in the first embodiment. FIG. [Figure 10] 4 is a diagram showing an inclined portion of the attachment / detachment tool in the first embodiment. FIG. [Figure 11] 4 is a diagram showing an inclined portion of the attachment / detachment tool in the first embodiment. FIG. [Figure 12] 1 is a schematic diagram of a system ceiling to which a removal method according to a first embodiment is applied. [Figure 13] FIG. 10 is a diagram showing a lifting step of the removal method in the first embodiment. [Figure 14] 10A to 10C are diagrams illustrating the transition of states of the attachment / detachment tool in the lifting process and the clamping process in the first embodiment. [Figure 15] FIG. 10 is a diagram showing a tilting step of the removal method in the first embodiment. [Figure 16] 10 is a diagram showing a state of the attachment / detachment tool in the tilting step in the first embodiment. FIG. [Figure 17] FIG. 10 is a diagram showing a descending step of the removal method in the first embodiment. [Figure 18] 10 is a diagram showing a main part of a first modified example of the attachment / detachment tool according to the first embodiment. FIG. [Figure 19] 10 is a diagram showing a main part of a second modified example of the attachment / detachment tool according to the first embodiment. FIG. [Figure 20] FIG. 10 is a side view of the attachment / detachment tool according to the second embodiment. [Figure 21] FIG. 11 is a perspective view of an attachment / detachment tool according to a third embodiment. [Figure 22]FIG. 11 is a perspective view of the attachment / detachment tool according to the third embodiment when it is being used for detachment work. [Figure 23] FIG. 11 is a perspective view of the attachment / detachment tool according to the third embodiment when it is being used for detachment work. [Figure 24] FIG. 11 is a perspective view of the attachment / detachment tool according to the third embodiment when it is being used for detachment work. [Figure 25] FIG. 11 is a perspective view of the attachment / detachment tool according to the third embodiment when it is being used for detachment work. DETAILED DESCRIPTION OF THE INVENTION

[0010] The embodiments of the present disclosure will be described with reference to the accompanying drawings. In each drawing, the same or corresponding parts are designated by the same reference numerals. Duplicate descriptions of these parts will be appropriately simplified or omitted.

[0011] Embodiment 1 Fig. 1 is a perspective view of a system ceiling to which the attachment / detachment tool according to the first embodiment is applied, as seen from below. Fig. 2 is a perspective view of a ceiling board to which the attachment / detachment tool according to the first embodiment is applied.

[0012] The system ceiling 100 shown in Fig. 1 is generally used as a ceiling for a room such as an office. The system ceiling 100 includes a framework 101 consisting of a frame 102, a plurality of ceiling boards 103, and ceiling equipment 104. Fig. 1 shows the system ceiling 100 with some of the plurality of ceiling boards 103 removed.

[0013] The aggregate 101 is a collection of beams hung from the ceiling. The aggregate 101 is made up of multiple beams intersecting each other. The aggregate 101 may be attached directly to the structure that forms the room, or may be suspended from the structure. A square hole is formed in the aggregate 101, with one side being a beam. In other words, the aggregate 101 has a square mesh. When focusing on one square hole, the beams on the four sides that form the hole form a frame 102. In other words, the aggregate 101 can also be expressed as being formed by joining multiple frame bodies 102 together.

[0014] The ceiling board 103 is a board that constitutes the ceiling surface of the system ceiling 100. The ceiling board 103 is made of a lightweight material such as plasterboard. The ceiling board 103 is fitted into the frame 102. The ceiling equipment 104 is equipment such as air conditioning equipment, lighting equipment, sensors, and audio equipment. The ceiling equipment 104 is placed on one or more frame bodies 102. For example, the underside of the ceiling equipment 104 is exposed to the inside of the room.

[0015] In the system ceiling 100, a ceiling board 103 or a ceiling device 104 is fitted into each frame 102 of a framework 101. The lower surfaces of the ceiling boards 103 and the lower surfaces of the ceiling devices 104 form the ceiling surface of the room.

[0016] As shown in FIG. 2, the ceiling board 103 is divided into a closed portion 105 and an edge portion 106. The closed portion 105 has a square shape that is the same as the hole in the frame body 102, which is not shown in FIG. 2. The closed portion 105 of the ceiling board 103 is exposed to the inside of the room. The edge portion 106 is a side that forms the periphery of the closed portion 105. A step is provided between the edge portion 106 and the closed portion 105. When the ceiling board 103 is installed, the edge portion 106 rests on the frame body 102.

[0017] That is, the ceiling board 103 has a square shape that is larger than the square hole of the frame body 102 by the size of the ear portion 106. Because of this shape, the ceiling board 103 forms the system ceiling 100 by being placed on the frame body 102. At this time, the ceiling board 103 is not fixed to the frame body 102.

[0018] When removing the ceiling board 103, the ceiling board 103 is pushed upward from the underside of the blocking portion 105, causing the ceiling board 103 to lift up from the frame body 102. Thereafter, when the position of the ceiling board 103 changes to a passing position, the ceiling board 103 becomes able to pass through the hole in the frame body 102. The ceiling board 103 is moved from the upper side to the lower side of the frame body 102 while remaining in the passing position, and is removed from the system ceiling 100. When the ceiling board 103 is installed, the reverse procedure of the removal is performed.

[0019] Next, the attachment / detachment tool 1 will be described with reference to Fig. 3 to Fig. 11. Note that in Fig. 3 to Fig. 11, illustration of the configuration related to the system ceiling 100 is omitted. Fig. 3 is a perspective view of the attachment / detachment tool in embodiment 1. Fig. 4 is a diagram showing the shaft portion of the attachment / detachment tool in embodiment 1. Fig. 5 is a simplified perspective view of the attachment / detachment tool in embodiment 1. Fig. 6 is a diagram showing another example of the tip member of the attachment / detachment tool in embodiment 1. Fig. 7 is a perspective view of the driver of the attachment / detachment tool in embodiment 1. Fig. 8 is a top view of the main portion of the attachment / detachment tool in embodiment 1. Fig. 9 is a diagram showing the handle portion of the attachment / detachment tool in embodiment 1. Figs. 10 and 11 are diagrams showing the inclined portion of the attachment / detachment tool in embodiment 1.

[0020] A worker uses the installation / removal tool 1 to install or remove the ceiling board 103, i.e., to attach or remove the ceiling board 103. At this time, the worker holds the installation / removal tool 1 in his / her hand and performs the work of installing or removing the ceiling board 103. As shown in FIG. 3 , the installation / removal tool 1 includes a handle portion 2, a plate receiving portion 3, a shaft portion 4, and an inclined portion 5. The inclined portion 5 includes an angle operation portion 6.

[0021] The handle 2 is a portion that is held by a worker. For example, the handle 2 is rod-shaped. The handle 2 may be provided with an auxiliary rod or the like to make it easier to grip.

[0022] The board receiving portion 3 is a portion that comes into contact with the ceiling board 103 during installation and removal work, and supports the ceiling board 103. The board receiving portion 3 supports the ceiling board 103 so that the ceiling board 103 in contact with it does not move relative to the ceiling board 103.

[0023] The shaft 4 connects the handle 2 and the plate receiving portion 3. When the handle 2 is held by an operator, the shaft 4 supports the load of the plate receiving portion 3. The shaft 4 is rod-shaped. In this embodiment, the shaft 4 expands and contracts so that the distance between the handle 2 and the plate receiving portion 3 changes. As also shown in FIG. 4 , for example, the shaft 4 expands and contracts in the extension direction as the two rods slide at the expansion and contraction point 4a. For example, by tightening or loosening the fastening member 4b, the two rods can slide or can be fixed so that they do not slide. The shaft 4 may be provided with an automatic expansion and contraction mechanism.

[0024] The tilting portion 5 is provided on the shaft 4 closer to the plate receiving portion 3 than the extendable portion 4a. The tilting portion 5 can change the angle of the plate receiving portion 3 relative to the shaft 4. The tilting portion 5 may include an angle operation portion 6. The angle operation portion 6 reflects an operation from an operator that changes the angle of the tilting portion 5. In this embodiment, the angle operation portion 6 is a string attached to the plate receiving portion 3. As also shown in the simplified diagram of Figure 5, the angle of the tilting portion 5 can be changed, for example, by pulling the angle operation portion 6 downward in the direction of the extension line of the shaft 4.

[0025] Next, the board receiving unit 3 in this embodiment will be described in more detail. The board receiving unit 3 includes a clamping unit 10. The clamping unit 10 clamps two opposing side surfaces of the ceiling board 103. The clamping unit 10 includes an arm member 11, a tip member 12, a cushion member 13, and a drive unit 14.

[0026] In this embodiment, clipping unit 10 is provided with four arm members 11. That is, clipping unit 10 is provided with first arm member 11a, second arm member 11b, third arm member 11c, and fourth arm member 11d as arm members 11. First arm member 11a and second arm member 11b form one pair of arm members 11 of clipping unit 10. Third arm member 11c and fourth arm member 11d form another pair of arm members 11 of clipping unit 10.

[0027] The first arm member 11a is rod-shaped and extends outward from the shaft 4. In this embodiment, the first arm member 11a extends from the shaft 4 along a plane perpendicular to the extension direction of the shaft 4. The second arm member 11b is rod-shaped and extends from the shaft 4 on the opposite side to the first arm member 11a. In this embodiment, the second arm member 11b extends from the shaft 4 along a plane perpendicular to the extension direction of the shaft 4. For example, the angle between the first arm member 11a and the shaft 4 and the angle between the second arm member 11b and the shaft 4 are equal. In this embodiment, this angle is 90 degrees. In addition, in a projection image onto a projection plane perpendicular to the extension direction of shaft portion 4, as long as first arm member 11a and second arm member 11b extend in opposite directions from shaft portion 4, the angle formed by first arm member 11a and shaft portion 4 and the angle formed by second arm member 11b and shaft portion 4 do not have to be 90 degrees.

[0028] Third arm member 11c is rod-shaped and extends outward from shaft 4. In this embodiment, third arm member 11c extends from shaft 4 along a plane perpendicular to the extension direction of shaft 4. Fourth arm member 11d is rod-shaped and extends from shaft 4 on the opposite side to third arm member 11c. In this embodiment, fourth arm member 11d extends from shaft 4 along a plane perpendicular to the extension direction of shaft 4. For example, the angle between third arm member 11c and shaft 4 and the angle between fourth arm member 11d and shaft 4 are equal. In this embodiment, this angle is 90 degrees. In addition, in a projection image onto a projection plane perpendicular to the extension direction of shaft portion 4, as long as third arm member 11c and fourth arm member 11d extend in opposite directions from shaft portion 4, the angle formed by third arm member 11c and shaft portion 4 and the angle formed by fourth arm member 11d and shaft portion 4 do not have to be 90 degrees.

[0029] The tip member 12 is provided at the tip of the arm member 11. Here, the tip of the arm member 11 refers to the end of the arm member 11 opposite the shaft portion 4. In this embodiment, the clipping portion 10 is provided with four tip members 12. That is, the clipping portion 10 is provided with the tip members 12, namely, a first tip member 12a, a second tip member 12b, a third tip member 12c, and a fourth tip member 12d.

[0030] The first tip member 12a is provided at the tip of the first arm member 11a. The first tip member 12a is shaped like a claw. The first tip member 12a has a first side portion 15a and a first top portion 16a that face toward the shaft portion 4. The first top portion 16a is connected to the first side portion 15a. The first top portion 16a faces upward in the extension direction of the shaft portion 4, i.e., faces the opposite side from the handle portion 2 in the extension direction. The first side portion 15a and the first top portion 16a are made of different materials. The coefficient of friction of the material of the first top portion 16a is smaller than the coefficient of friction of the material of the first side portion 15a. In other words, the first top portion 16a is relatively slippery against the ceiling board 103. The first side portion 15a is relatively non-slip against the ceiling board 103.

[0031] As shown in Fig. 6, the tip member 12 does not have to have the shape shown in Fig. 3. For example, the tip member 12 may have a member forming the side surface portion 15 and a member forming the top surface portion 16 joined approximately perpendicularly.

[0032] The second tip member 12b, the third tip member 12c, and the fourth tip member 12d each have the same configuration as the first tip member 12a. That is, the second tip member 12b has a second side surface portion 15b and a second top surface portion 16b. The third tip member 12c has a third side surface portion 15c and a third top surface portion 16c. The fourth tip member 12d has a fourth side surface portion 15d and a fourth top surface portion 16d.

[0033] The cushion members 13 are provided on the upper surface of each arm member 11. For example, the cushion members 13 are made of a soft, sponge-like material.

[0034] The driver 14 functions as a driver and moves the arm member 11. The driver 14 moves the first arm member 11a and the second arm member 11b in synchronization. As the first arm member 11a and the second arm member 11b move, the distance between the first tip member 12a and the second tip member 12b changes with the shaft 4 as the starting point on a projection plane that is a projection onto a plane perpendicular to the extension direction of the shaft 4. Specifically, on the projection plane, the first tip member 12a and the second tip member 12b move closer to or further away from the shaft 4.

[0035] Driver 14 moves third arm member 11c and fourth arm member 11d in synchronization. As third arm member 11c and fourth arm member 11d move, the distance between third tip member 12c and fourth tip member 12d changes with shaft 4 as the starting point on the projection plane. Specifically, on the projection plane, third tip member 12c and fourth tip member 12d move toward shaft 4 in the closing direction, or move away from shaft 4 in the opening direction. Clipper unit 10 can transition between a closed state and an open state.

[0036] In the closed state, the distance between first tip member 12a and second tip member 12b is shorter than the distance between two opposing sides of ceiling board 103. In the closed state, the distance between third tip member 12c and fourth tip member 12d is shorter than the distance between two opposing sides of ceiling board 103. In the closed state, clipping unit 10 can pass through the hole in frame 102.

[0037] In the open state, the distance between first tip member 12a and second tip member 12b is longer than the distance between two opposing sides of ceiling board 103. In the open state, the distance between third tip member 12c and fourth tip member 12d is longer than the distance between two opposing sides of ceiling board 103. By closing from the open state, clipping unit 10 can clip two opposing sides of ceiling board 103 with the pair of first side surface portion 15a and second side surface portion 15b or the pair of third side surface portion 15c and fourth side surface portion 15d.

[0038] 7 and 8, as an example, the driver 14 has a motor 14a and a pinion gear 14b. The first arm member 11a and the second arm member 11b are provided with rack grooves corresponding to the pinion gear 14b. As the pinion gear 14b meshes with the rack grooves, the first arm member 11a and the second arm member 11b rotate, causing them to move synchronously in opposite directions tangential to the pinion gear 14b.

[0039] The third arm member 11c and the fourth arm member 11d have the same structure as the first arm member 11a and the second arm member 11b. For example, the first arm member 11a, the second arm member 11b, the third arm member 11c, and the fourth arm member 11d are meshed with one pinion gear 14b via rack grooves. In this case, when the shaft of the motor 14a rotates, the four arm members 11 move in synchronization.

[0040] 9, for example, an operation unit 14c for operating the operation of the drive unit 14 is provided on the handle 2. The operation unit 14c is provided with an "open" button for moving the arm member 11 in the opening direction and a "close" button for moving the arm member 11 in the closing direction.

[0041] Next, an example of the inclined portion 5 will be described with reference to Figures 10 and 11. The inclined portion 5 changes the angle between an upper side 4c of the shaft portion 4 that is closer to the plate receiving portion 3 than the inclined portion 5 and a lower side 4d of the shaft portion 4 that is closer to the expandable portion 4a and the handle portion 2 than the inclined portion 5. In this example, the inclined portion 5 is a ball member 50.

[0042] The ball member 50 includes a ball portion 51, a holding portion 52, and an adjustment portion 53. The ball portion 51 is spherical. The ball portion 51 is connected to the upper side 4c of the shaft portion 4. The ball portion 51 is covered by the holding portion 52. The adjustment portion 53 adjusts the force with which the holding portion 52 tightens the ball portion 51. The holding portion 52 is connected to the lower side 4d of the shaft portion 4 at the position of the adjustment portion 53.

[0043] When the holding portion 52 does not tightly fasten the ball portion 51, the ball portion 51 can rotate freely inside the holding portion 52. For example, when the ball portion 51 rotates in the direction of arrow A1, the orientation of the upper side 4c tilts. The angle between the upper side 4c and the lower side 4d of the shaft portion 4 changes. At this time, the angle between the handle portion 2 and the plate receiving portion 3 (not shown) changes.

[0044] When the adjustment portion 53 is turned in the tightening direction of the arrow A2, the holding portion 52 tightens the ball portion 51. In this case, the ball portion 51 does not move relative to the holding portion 52. At this time, the upper side 4c of the shaft portion 4 is fixed. That is, the angle between the upper side 4c and the lower side 4d of the shaft portion 4 is fixed.

[0045] Next, a method for removing the ceiling board 103 using the removal tool 1 will be described with reference to FIGS. Fig. 12 is a schematic diagram of a system ceiling to which the removal method according to the first embodiment is applied. Fig. 13 is a diagram showing the lifting process of the removal method according to the first embodiment. Fig. 14 is a diagram showing the state transitions of the removal tool according to the first embodiment in the lifting process and clamping process. Fig. 15 is a diagram showing the tilting process of the removal method according to the first embodiment. Fig. 16 is a diagram showing the state of the removal tool according to the first embodiment in the tilting process. Fig. 17 is a diagram showing the lowering process of the removal method according to the first embodiment.

[0046] In the method for removing the ceiling board 103, the lifting process, clamping process, tilting process, and lowering process are carried out in this order. Note that in the method for attaching the ceiling board 103 to the system ceiling 100, the steps of the removal method are carried out in the reverse order. As shown in Figure 12, in the following illustrations, the ceiling board 103 attached to the aggregate 101 is used as the boundary, with the upper side of the paper indicating the side above the ceiling and the lower side of the paper indicating the side of the interior space.

[0047] 13, the worker carries the installation / removal tool 1 and moves to the ceiling board 103. At this time, the plate receiving portion 3 is in a closed state so that the ceiling board 103 can pass through the frame body 102. Thereafter, the worker lifts the installation / removal tool 1, and the ceiling board 103 is supported by the plate receiving portion 3 of the installation / removal tool 1 and is lifted above the frame body 102.

[0048] Thereafter, the clamping step shown in Fig. 14 is carried out. In this embodiment, the ceiling board 103 is placed on the tip members 12a, 12b, 12c, and 12d. Specifically, in Fig. 14(A) showing the lifting step, the ceiling board 103 is lifted while being supported by the upper surface portions 16a, 16b, 16c, and 16d.

[0049] 14(B), in the clamping process, arm members 11a, 11b, 11c, and 11d are opened by driver 14. Specifically, as driver 14 operates, arm members 11a, 11b, 11c, and 11d move away from shaft 4. At this time, each of upper surface portions 16a, 16b, 16c, and 16d slides along the underside of ceiling board 103, and moves relative to ceiling board 103.

[0050] Arm members 11a, 11b, 11c, and 11d stop when the pair of first tip member 12a and second tip member 12b and the pair of third tip member 12c and fourth tip member 12d are each farther away than two opposing sides of ceiling board 103. In this state, ceiling board 103 rests on cushion member 13.

[0051] Thereafter, as the driver 14 operates, the arm members 11a, 11b, 11c, and 11d move closer to the shaft 4. The distance between the first tip member 12a and the second tip member 12b decreases. Then, as shown in FIG. 14(C), the clamping unit 10 clamps two opposing sides of the ceiling board 103 between the first tip member 12a and the second tip member 12b. The clamping unit 10 clamps the other two opposing sides of the ceiling board 103 between the third tip member 12c and the fourth tip member 12d.

[0052] In this state, the ceiling board 103 is sandwiched between the side surfaces 15a, 15b, 15c, and 15d, with the underside perpendicular to the extension of the shaft 4. The coefficient of friction between the side surfaces 15a, 15b, 15c, and 15d and the ceiling board 103 is relatively high. Therefore, the ceiling board 103 does not move relative to the plate receiving portion 3. In particular, the ceiling board 103 is fixed to the attachment / detachment tool 1 in the plane perpendicular to the underside, i.e., the extension of the shaft 4.

[0053] 15 and 16 is then performed. In the tilting process, the worker rotates the attachment / detachment tool 1 by approximately 45 degrees around the extension direction of the shaft portion 4, as shown by arrow A3. By this operation, the worker rotates the ceiling board 103 on a horizontal plane perpendicular to the extension direction of the shaft portion 4. One side of the ceiling board 103 becomes approximately parallel to the diagonal line of the frame body 102.

[0054] Furthermore, in the tilting step, the worker operates the angle operation unit 6 of the tilting unit 5 to change the angle of the board receiving unit 3 relative to the shaft 4. For example, the worker pulls the string of the angle operation unit 6 as shown by arrow A4. As also shown in Figure 16, in this operation, the worker tilts the ceiling board 103 relative to the horizontal plane to put it into the passing position.

[0055] By performing the tilting step, the projection area of ​​the ceiling board 103 becomes smaller than the area of ​​the hole in the frame body 102 on the horizontal projection plane.

[0056] Thereafter, the lowering step shown in Fig. 17 is performed. In the lowering step, the worker lowers the handle 2 downward as indicated by arrow A5. The worker may instead retract the shaft 4, or may perform both the lowering of the handle 2 and the retraction of the shaft 4.

[0057] By the lowering process, the ceiling board 103 passes through the holes in the frame 102 and moves from the upper side to the lower side of the aggregate 101. At the bottom of the system ceiling 100, a worker removes the ceiling board 103 from the installation / removal tool 1. In this way, the ceiling board 103 is removed from the system ceiling 100.

[0058] In this way, the attachment / detachment tool 1 is used while being held by a worker. On the other hand, the lifting device described in Patent Document 1 is heavy, so the board is lifted while placed on the floor. Generally, the work of removing the ceiling board 103 is also performed during maintenance of the ceiling equipment 104. During maintenance, the ceiling board 103 around the ceiling equipment 104 is removed. When the system ceiling 100 is used in an office space, desks, machines, and other furniture used in the office space are present below the ceiling board 103. In this case, it may be difficult to secure sufficient space to install the lifting device. The attachment / detachment tool 1 can easily attach and detach the ceiling board 103 even when the working space below is limited.

[0059] Furthermore, conventionally, the ceiling board 103 has been directly removed by a worker standing on a stepladder. In this case, it is necessary to secure space under the ceiling board 103 to place the stepladder. When removing multiple ceiling boards 103, the stepladder needs to be moved each time. Furthermore, dust that accumulates on the ceiling board 103's backside may dirty the worker's hands. In particular, when lifting the ceiling board 103, the worker needs to avoid touching the underside of the ceiling board 103 with dirty hands, and avoid performing other tasks with dirty hands. This may reduce the efficiency of the series of tasks. By using the attachment / detachment tool 1 of the present embodiment, it is possible to prevent the underside of the ceiling board 103 from becoming dirty and to perform the series of tasks efficiently.

[0060] According to the first embodiment described above, the installation / removal tool 1 includes the handle portion 2, the board receiving portion 3, the shaft portion 4, and the inclined portion 5. The board receiving portion 3 supports the ceiling board 103 so that the ceiling board 103 does not move relative to the shaft portion 4. The inclined portion 5 can change the angle of the board receiving portion 3 relative to the shaft portion 4. For example, a worker uses the installation / removal tool 1 to lift the ceiling board 103 and then tilt it. Then, the worker tilts the ceiling board 103 using the inclined portion 5 to remove the ceiling board 103 from the system ceiling 100. In this way, the installation / removal tool 1 allows the worker to easily remove or install the ceiling board 103 of the system ceiling 100.

[0061] The board receiving portion 3 also includes a clamping portion 10. In particular, the clamping portion 10 has a first arm member 11a, a second arm member 11b, a first tip member 12a, and a second tip member 12b. In the clamping process, the first arm member 11a and the second arm member 11b move, thereby clamping the ceiling board 103 between the first tip member 12a and the second tip member 12b. In this way, by being clamped by the clamping portion 10, the ceiling board 103 does not move relative to the board receiving portion 3, and the load can be supported.

[0062] The first tip member 12a has a first side surface portion 15a and a first upper surface portion 16a. The first upper surface portion 16a is made of a material with a lower coefficient of friction than the first side surface portion 15a. The second tip member 12b has a second side surface portion 15b and a second upper surface portion 16b. The second upper surface portion 16b is made of a material with a lower coefficient of friction than the second side surface portion 15b. In the lifting process, the ceiling board 103 is lifted by the first upper surface portion 16a and the second upper surface portion 16b. Because the first upper surface portion 16a and the second upper surface portion 16b have a lower coefficient of friction, the first upper surface portion 16a and the second upper surface portion 16b slide along the underside of the ceiling board 103 when the clamping unit 10 transitions to an open state in the subsequent clamping process. At this time, the relative position of the ceiling board 103 with respect to the shaft portion 4 remains generally constant. Thereafter, the ceiling board 103 is sandwiched between the first side surface portion 15a and the second side surface portion 15b. Because the coefficient of friction between the first side surface portion 15a and the second side surface portion 15b is relatively large, the ceiling board 103 can be securely sandwiched. As a result, the attachment / detachment tool 1 that can be used in the lifting process and the clamping process can be manufactured with a simple configuration.

[0063] The clipping unit 10 further includes a driving unit, ie, a driving machine 14. Therefore, the attachment / detachment tool 1 can automatically move the first arm member 11a and the second arm member 11b.

[0064] Furthermore, the shaft 4 expands and contracts to change the distance between the handle 2 and the plate receiving portion 3. This improves the portability of the attachment / detachment tool 1. Furthermore, the shaft 4 can be retracted during the lowering process.

[0065] The upper surface 16 of the tip member 12 may be formed of a roller.

[0066] The inclined portion 5 may be manufactured in a different form. A first modified example and a second modified example of the inclined portion 5 will be described below.

[0067] FIG. 18 is a diagram showing a main part of a first modified example of the attachment / detachment tool according to the first embodiment.

[0068] FIG. 18 shows the inclined portion 5 as a main part of the attachment / detachment tool 1. In a first modified example, the inclined portion 5 is a flexible arm 54. The flexible arm 54 is a rod-shaped composite member that can be changed in shape by human force. The flexible arm 54 maintains its shape unless an external force exceeding a specified value is applied. In this modified example, the flexible arm 54 maintains its shape even when the load of the plate receiving portion 3 and the ceiling board 103 is applied obliquely.

[0069] The upper side 4c and the lower side 4d of the shaft portion 4 are connected by the flexible arm 54. The inclined portion 5 changes the angle formed between the upper side 4c and the lower side 4d of the shaft portion 4 by bending its middle portion.

[0070] According to the first modification of the first embodiment described above, the inclined portion 5 is a flexible arm 54. This makes it possible to easily form the inclined portion 5. Furthermore, by forming the inclined portion 5 with a small weight, it is possible to improve the workability of the worker.

[0071] FIG. 19 is a diagram showing a main part of a second modified example of the attachment / detachment tool according to the first embodiment.

[0072] FIG. 19 shows the inclined portion 5 as a main part of the attachment / detachment tool 1. In the second modified example, the inclined portion 5 is a motor 55. The motor 55 rotates a rod-shaped rotating shaft 56. The rotating shaft 56 is connected perpendicularly to the upper side 4c of the shaft portion 4. For example, the motor 55 is fixed to the lower side 4d of the shaft portion 4. The upper side 4c of the shaft portion 4 corresponds to the shaft on the plate receiving portion 3 side. The lower side 4d of the shaft portion 4 corresponds to the shaft on the handle portion 2 side.

[0073] A motor 55 included in the inclined portion 5 rotates a rotary shaft 56. The angle formed between the upper side 4c and the lower side 4d of the shaft portion 4 changes by the amount of rotation of the rotary shaft 56.

[0074] Although not shown, a drive switch for the motor 55 may be provided on the handle 2 as the angle operation unit 6. The worker can change the angle between the upper side 4c and the lower side 4d of the shaft 4 simply by operating the drive switch.

[0075] According to the second modification of the first embodiment described above, the inclined portion 5 is a motor 55. The motor 55 changes the angle between the axis of the shaft portion 4 on the plate receiving portion 3 side and the axis of the shaft portion 4 on the handle portion 2 side. This makes it easy to form the inclined portion 5.

[0076] Embodiment 2 20 is a side view of the attachment / detachment tool in embodiment 2. Note that the same or corresponding parts as those in embodiment 1 are denoted by the same reference numerals, and the description of these parts will be omitted.

[0077] 20, the attachment / detachment tool 1 in the second embodiment has a simpler configuration than the attachment / detachment tool 1 in the first embodiment. The attachment / detachment tool 1 includes a handle portion 2, a plate receiving portion 3, a shaft portion 4, and an inclined portion 5. The inclined portion 5 includes an angle operation portion 6.

[0078] In the second embodiment, the plate receiving portion 3 is composed of a receiving plate 30 and a cushion member 13. The shaft portion 4 is rod-shaped and does not expand or contract.

[0079] The inclined portion 5 may be a ball member 50 similar to that in the first embodiment. The inclined portion 5 is provided on the shaft portion 4, and supports the load of the plate receiving portion 3 together with the shaft portion 4.

[0080] According to the second embodiment described above, it is possible to use the attachment / detachment tool 1 which is lightweight and easy to work with. In addition, the attachment / detachment tool 1 can be configured at low cost.

[0081] Embodiment 3 Fig. 21 is a perspective view of the attachment / detachment tool in embodiment 3. Figs. 22 to 25 are perspective views of the attachment / detachment tool in embodiment 3 when it is being used for removal work. Note that parts that are the same as or equivalent to parts in embodiment 1 are given the same reference numerals, and explanations of these parts will be omitted.

[0082] 21 , the attachment / detachment tool 1 according to the third embodiment further includes a mounting portion 20. The mounting portion 20 is located in the extension direction of the shaft portion 4. For example, the mounting portion 20 includes a rod member 21 extending from the shaft portion 4 and a cushion member 22.

[0083] The longitudinal direction of the rod member 21 coincides with the extension direction of the shaft portion 4. The rod member 21 slides on the shaft portion 4, and can expand and contract relative to the shaft portion 4. The cushion member 22 is provided at the end of the rod member 21 opposite the shaft portion 4. The cushion member 22 is made of sponge, for example.

[0084] As the rod member 21 expands and contracts relative to the shaft portion 4, the cushion member 22, which is the tip of the mounting portion 20, can change the distance from the shaft portion 4. The cushion member 22 can move between a position on the shaft portion 4 side and a position opposite the shaft portion 4 with respect to a plane on which the first tip member 12a and the second tip member 12b rest and which is perpendicular to the extension direction of the shaft portion 4. In other words, the mounting portion 20 can move between a position on the shaft portion 4 side and a position opposite the shaft portion 4 with respect to a plane that includes the clamping portion 10 and is perpendicular to the extension direction of the shaft portion 4.

[0085] Furthermore, the shape of the attachment / detachment tool 1 in the third embodiment, excluding the placement section 20, is different from the shape of the attachment / detachment tool 1 in the first or second embodiment. In particular, the attachment / detachment tool 1 in the third embodiment is not provided with a motor or other machinery. This makes the attachment / detachment tool 1 lighter, improving the ease of use when an operator holds and uses the tool by hand.

[0086] In embodiment 3, first arm member 11a is bifurcated toward the tip. Two first tip members 12a are provided on first arm member 11a. Second arm member 11b is bifurcated toward the tip. Two second tip members 12b are provided on second arm member 11b. Although not shown in the figures, in embodiment 3, first tip member 12a and second tip member 12b have the same configuration as in embodiment 1.

[0087] Clipper unit 10 has a connecting portion 40 and a spring 41. First arm member 11a and second arm member 11b are rotatable about connecting portion 40. Connecting portion 40 is attached to shaft portion 4. The angle formed between first arm member 11a and second arm member 11b on the side opposite handle unit 2 is less than 180 degrees.

[0088] Both ends of a spring 41 are attached to the first arm member 11a and the second arm member 11b on the side where the angle between them is less than 180 degrees. The spring 41 is provided so that a restoring force acts in the direction in which the first arm member 11a and the second arm member 11b are pulled toward each other. The restoring force of the spring 41 is set to a force that closes the first arm member 11a and the second arm member 11b when the mounting portion 20 faces vertically upward. The restoring force of the spring 41 is set to a force that opens the first arm member 11a and the second arm member 11b when the mounting portion 20 faces upward and one ceiling board 103 is placed on the first tip member 12a and the second tip member 12b.

[0089] The attachment / detachment tool 1 further includes a hinge 42 and an operating arm 43 as the inclined portion 5. In FIG. 21 , the hinge 42 is indicated by a dashed line. The hinge 42 is fixed to the shaft portion 4 at the same position as the connection portion 40 of the shaft portion 4. The operating arm 43 is rod-shaped. One end of the operating arm 43 is fixed to the hinge 42. One end of the operating arm 43 is fixed to the clamping portion 10 and the placing portion 20, which are the plate receiving portion 3. The other end of the operating arm 43 is a free end near the handle portion 2. In FIG. 21 , the operating arm 43 is aligned with the shaft portion 4. The hinge 42 connects the shaft portion 4 and the operating arm 43 so that the shaft portion 4 can rotate relative to the operating arm 43.

[0090] Next, a process for removing the ceiling board 103 using the removal tool 1 of the third embodiment will be described with reference to Figures 22 to 25. For ease of explanation, the hinges 42 are omitted from the illustration.

[0091] 22 shows the attachment / detachment tool 1 in the lifting process. In the lifting process, the clipping section 10 is in a closed state. Specifically, the distance between the first tip member 12a and the second tip member 12b is shorter than the distance between two opposing sides of the ceiling board 103. The placement section 20 is located on the opposite side of the shaft section 4 with respect to a plane that includes the first tip member 12a and the second tip member 12b.

[0092] In this state, the worker holds the attachment / detachment tool 1 so that the placement portion 20 is located on the upper side, and lifts it up toward the ceiling board 103. The ceiling board 103 is lifted upward by the placement portion 20.

[0093] Thereafter, in the clamping process, the worker lowers the placing unit 20 while keeping the shaft 4 at the same height. The placing unit 20 moves from the opposite side of the shaft 4 to the side of the shaft 4 with respect to the plane that includes the first tip member 12a and the second tip member 12b. As the placing unit 20 moves, the ceiling board 103 rests on the first tip member 12a and the second tip member 12b.

[0094] As the ceiling board 103 continues to descend, the first arm member 11a and the second arm member 11b, which had been closed by the spring 41, begin to open as the ceiling board 103 descends. After that, the distance between the first tip member 12a and the second tip member 12b becomes longer than the distance between the two opposing sides of the ceiling board 103, and the first side surface portion 15a and the second side surface portion 15b face the side surfaces of the ceiling board 103.

[0095] In this state, the worker raises the placing portion 20. As shown in Figure 23, as the ceiling board 103 is raised by the placing portion 20, the first arm member 11a and the second arm member 11b close again, and the first side surface portion 15a and the second side surface portion 15b sandwich the ceiling board 103. In this way, the ceiling board 103 is fixed by the sandwiching portion 10, which is the board receiving portion 3, and the placing portion 20.

[0096] Thereafter, the tilting process shown in Figures 24 and 25 is performed. As shown in Figure 24, the worker rotates the shaft portion 4. As shown in Figure 25, the worker rotates the operating arm 43 relative to the shaft portion 4 around the hinge 42. When the operating arm 43 rotates and tilts relative to the shaft portion 4, the placement portion 20, the clamping portion 10, and the ceiling board 103 tilt relative to the shaft portion 4 together with the operating arm 43. As a result, the ceiling board 103 tilts relative to the horizontal plane. Thereafter, the lowering process is performed as in the first embodiment.

[0097] According to the third embodiment described above, it is possible to use the attachment / detachment tool 1, which is lightweight and easy to work with. Furthermore, the plate receiving portion 3 of the attachment / detachment tool 1 further includes the placing portion 20. In such an attachment / detachment tool 1, the ceiling board 103 is lifted by the placing portion 20, not by the clamping portion 10. Therefore, the ceiling board 103 can be lifted stably. Furthermore, the worker can perform the clamping process safely and reliably.

[0098] The attachment / detachment tool 1 in the first embodiment may be provided with a placement section 20.

[0099] To summarize the above explanation, possible configurations of the technology according to the present disclosure include the configurations listed below as appendices. (Appendix 1) A tool for attaching and detaching ceiling boards to and from the framework of a system ceiling, a handle portion to be held by an operator; a plate receiving portion that supports the ceiling board so that the ceiling board does not move relative to the ceiling board when the ceiling board is attached or detached; a shaft portion that connects the handle portion and the plate receiving portion and supports the load of the plate receiving portion; an inclined portion provided on the shaft portion and capable of changing an angle of the plate receiving portion with respect to the shaft portion; A removal device equipped with (Appendix 2) The board receiving portion includes a clamping portion that clamps two opposing side surfaces of the ceiling board to prevent the ceiling board from moving relatively. The attachment and detachment device described in Appendix 1. (Appendix 3) The clamping portion is a first arm member extending from the shaft portion; a second arm member extending from the shaft portion to the opposite side to the first arm member; a first tip member provided at the tip of the first arm member; a second tip member provided at the tip of the second arm member; and The first arm member and the second arm member move so that the distance between the first tip member and the second tip member changes from the shaft portion on a projection plane including the underside of the ceiling board sandwiched by the clamping portion, and two opposing sides of the ceiling board are sandwiched between the first tip member and the second tip member. The attachment and detachment device described in Appendix 2. (Appendix 4) the first tip member has a first side surface facing the shaft portion and a first upper surface connected to the first side surface and facing upward; The second tip member has a second side surface facing the shaft portion and a second upper surface connected to the second side surface facing upward. the first upper surface is made of a material having a smaller coefficient of friction than the first side surface, The second upper surface is made of a material having a smaller coefficient of friction than the second side surface. The attachment and detachment device described in Appendix 3. (Appendix 5) The clamping portion is a drive unit that moves the first arm member and the second arm member so that the first tip member and the second tip member move; Further having Attachment / detachment devices as described in Appendix 3 or Appendix 4. (Appendix 6) the plate receiving portion includes a mounting portion that is movable in the extension line direction of the shaft portion, the mounting portion is movable between a position on the side of the shaft portion and a position on the opposite side of the shaft portion with respect to a plane that includes the clamping portion and is perpendicular to an extension line direction of the shaft portion; Attachment / detachment tool according to any one of Supplementary Note 2 to Supplementary Note 5. (Appendix 7) The shaft portion expands and contracts so that the distance between the handle portion and the plate receiving portion changes. 7. The attachment / detachment tool according to any one of claims 1 to 6. (Appendix 8) The inclined portion is a rod-shaped flexible arm having a bendable middle portion. 8. The attachment / detachment tool according to any one of claims 1 to 7. (Appendix 9) The tilting unit includes a motor that changes an angle between an axis of the shaft portion on the handle side and an axis of the shaft portion on the plate receiving side. 8. The attachment / detachment tool according to any one of claims 1 to 7. (Appendix 10) A method for removing a ceiling board from a framework of a system ceiling using an attachment / detachment tool, comprising: The attachment / detachment tool includes a handle portion to be held by an operator, a plate receiving portion that supports the ceiling board so that the ceiling board does not move relative to the ceiling board when the ceiling board is attached or detached, a shaft portion that connects the handle portion and the plate receiving portion and supports the load of the plate receiving portion, and an inclined portion that is provided on the shaft portion and can change the angle of the plate receiving portion with respect to the shaft portion, a lifting step of supporting the ceiling board attached to the aggregate by the board receiving portion and lifting it upward; a tilting step, which is performed after the lifting step, in which the handle portion is rotated to rotate the ceiling board in a horizontal plane, and the tilting portion is used to change the angle of the board receiving portion to tilt the ceiling board relative to the horizontal plane; a lowering step, which is carried out after the tilting step, in which the handle portion is lowered downward and passed through a hole in a frame body of the aggregate, thereby moving the ceiling board from above the aggregate to below the aggregate; A removal method comprising: (Appendix 11) The board receiving portion of the attachment / detachment tool includes a clamping portion that clamps two opposing side surfaces of the ceiling board to prevent the ceiling board from moving relatively, a clamping step, which is carried out after the lifting step and before the tilting step, of gripping the ceiling board with the clamping portion; Further equipped with, Removal method described in Appendix 10. (Appendix 12) The clamping portion of the attachment / detachment tool is a first arm member extending from the shaft portion; a second arm member extending from the shaft portion to the opposite side to the first arm member; a first tip member provided at a tip of the first arm member and having a first side surface facing the shaft portion and a first upper surface connected to the first side surface and facing upward; a second tip member provided at a tip of the second arm member and having a second side surface facing the shaft portion and a second upper surface connected to the second side surface and facing upward; and the first upper surface is made of a material having a smaller coefficient of friction than the first side surface, the second upper surface is made of a material having a smaller coefficient of friction than the second side surface, The first arm member and the second arm member move so that the distance between the first tip member and the second tip member changes from the shaft portion as a starting point on a projection plane that is horizontal to the lower surface of the ceiling board sandwiched by the clamping portion, In the lifting step, the ceiling board is lifted by pushing the first upper surface and the second upper surface in a closed state in which the first tip member and the second tip member are spaced apart by a distance shorter than a distance between two opposing sides of the ceiling board, In the clamping step, the first tip member and the second tip member are opened to a distance greater than the distance between two opposing sides of the ceiling board, and then the first tip member and the second tip member are closed again to grip the ceiling board between the first side and the second side. Removal method described in Appendix 11. [Explanation of symbols]

[0100] 1 Attachment / detachment tool, 2 Handle portion, 3 Plate receiving portion, 4 Shaft portion, 4a Extension portion, 4b Fastening member, 4c Upper side, 4d Lower side, 5 Inclined portion, 6 Angle operation portion, 10 Clamp portion, 11 Arm member, 11a First arm member, 11b Second arm member, 11c Third arm member, 11d Fourth arm member, 12 Tip member, 12a First tip member, 12b Second tip member, 12c Third tip member, 12d Fourth tip member, 13 Cushion member, 14 Drive unit, 14a Motor, 14b Pinion gear, 14c Operation portion, 15 Side portion, 15a First side portion, 15b Second side portion, 15c Third side portion, 15d Fourth side portion, 16 Upper surface portion, 16a First upper surface portion, 16b Second upper surface portion, 16c Third upper surface portion, 16d Fourth upper surface portion, 20 Placement portion, 21 Rod member, 22 Cushion member, 30 Receiving plate, 40 Connection portion, 41 Spring, 42 Hinge, 43 Operating arm, 50 Ball member, 51 Ball portion, 52 Holding portion, 53 Adjustment portion, 54 Flexible arm, 55 Motor, 56 Rotating shaft, 100 System ceiling, 101 Frame, 102 Frame body, 103 Ceiling board, 104 Ceiling equipment, 105 Blocking portion, 106 Ear portion

Claims

1. A tool for attaching and detaching ceiling boards to and from the framework of a system ceiling, a handle portion to be held by an operator; a plate receiving portion that supports the ceiling board so that the ceiling board does not move relative to the ceiling board when the ceiling board is attached or detached; a shaft portion that connects the handle portion and the plate receiving portion and supports the load of the plate receiving portion; an inclined portion provided on the shaft portion and capable of changing an angle of the plate receiving portion with respect to the shaft portion; A removal device equipped with

2. The board receiving portion includes a clamping portion that clamps two opposing side surfaces of the ceiling board to prevent the ceiling board from moving relatively. The attachment / detachment tool according to claim 1 .

3. The clamping portion is a first arm member extending from the shaft portion; a second arm member extending from the shaft portion in a direction opposite to the first arm member; a first tip member provided at the tip of the first arm member; a second tip member provided at the tip of the second arm member; and The first arm member and the second arm member move so that the distance between the first tip member and the second tip member changes from the shaft portion as a starting point on a projection plane including the underside of the ceiling board sandwiched by the clamping portion, and two opposing sides of the ceiling board are sandwiched between the first tip member and the second tip member. The attachment / detachment tool according to claim 2 .

4. the first tip member has a first side surface facing the shaft portion and a first upper surface connected to the first side surface facing upward, The second tip member has a second side surface facing the shaft portion and a second upper surface connected to the second side surface facing upward. the first upper surface is made of a material having a smaller coefficient of friction than the first side surface, The second upper surface is made of a material having a smaller coefficient of friction than the second side surface. The attachment / detachment tool according to claim 3 .

5. The clamping portion is a drive unit that moves the first arm member and the second arm member so that the first tip member and the second tip member move; Further having The attachment / detachment tool according to claim 3 .

6. the plate receiving portion includes a mounting portion that is movable in the extension line direction of the shaft portion, the mounting portion is movable between a position on the side of the shaft portion and a position on the opposite side of the shaft portion with respect to a plane that includes the clamping portion and is perpendicular to an extension line direction of the shaft portion; The attachment / detachment tool according to any one of claims 2 to 5.

7. The shaft portion expands and contracts so that the distance between the handle portion and the plate receiving portion changes. The attachment / detachment tool according to any one of claims 1 to 5.

8. The inclined portion is a rod-shaped flexible arm having a bendable middle portion. The attachment / detachment tool according to any one of claims 1 to 5.

9. The tilting unit includes a motor that changes an angle between an axis of the shaft portion on the handle side and an axis of the shaft portion on the plate receiving side. The attachment / detachment tool according to any one of claims 1 to 5.

10. A method for removing a ceiling board from a framework of a system ceiling using an attachment / detachment tool, comprising: The attachment / detachment tool includes a handle portion to be held by an operator, a plate receiving portion that supports the ceiling board so that the ceiling board does not move relative to the ceiling board when the ceiling board is attached or detached, a shaft portion that connects the handle portion and the plate receiving portion and supports the load of the plate receiving portion, and an inclined portion that is provided on the shaft portion and can change the angle of the plate receiving portion with respect to the shaft portion, a lifting step of supporting the ceiling board attached to the aggregate by the board receiving portion and lifting it upward; a tilting step, which is performed after the lifting step, in which the handle portion is rotated to rotate the ceiling board in a horizontal plane, and the tilting portion is used to change the angle of the board receiving portion to tilt the ceiling board relative to the horizontal plane; a lowering step, which is carried out after the tilting step, in which the handle portion is lowered downward and passed through a hole in a frame body of the aggregate, thereby moving the ceiling board from above the aggregate to below the aggregate; A removal method comprising:

11. The board receiving portion of the attachment / detachment tool includes a clamping portion that clamps two opposing side surfaces of the ceiling board to prevent the ceiling board from moving relatively, a clamping step, which is carried out after the lifting step and before the tilting step, of gripping the ceiling board with the clamping portion; Further equipped with, The removal method according to claim 10.

12. The clamping portion of the attachment / detachment tool is a first arm member extending from the shaft portion; a second arm member extending from the shaft portion in a direction opposite to the first arm member; a first tip member provided at a tip of the first arm member and having a first side surface facing the shaft portion and a first upper surface connected to the first side surface and facing upward; a second tip member provided at a tip of the second arm member and having a second side surface facing the shaft portion and a second upper surface connected to the second side surface and facing upward; and the first upper surface is made of a material having a smaller coefficient of friction than the first side surface, the second upper surface is made of a material having a smaller coefficient of friction than the second side surface, The first arm member and the second arm member move so that the distance between the first tip member and the second tip member changes from the shaft portion as a starting point on a projection plane that is horizontal to the lower surface of the ceiling board sandwiched by the clamping portion, In the lifting step, the ceiling board is lifted by pushing the first upper surface and the second upper surface in a closed state in which the first tip member and the second tip member are spaced apart by a distance shorter than a distance between two opposing sides of the ceiling board, In the clamping step, the first tip member and the second tip member are opened to a distance greater than the distance between two opposing sides of the ceiling board, and then the first tip member and the second tip member are closed again to grip the ceiling board between the first side and the second side. The removal method according to claim 11.

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