Ceiling board holding device, construction method of ceiling board, and maintenance method of ceiling board

Abstract

To provide a ceiling board holding device capable of sufficiently enhancing stability of mounting and removing work of a ceiling board.SOLUTION: A ceiling board holding device 100 includes a holding part 10 for holding a ceiling board 200 having a lower surface 201 and a plurality of side surfaces 202 connected to an outer edge of the lower surface in a state where the lower surface is along a horizontal direction, a lifting part 20 for lifting the holding part, and a support part 30 for supporting the holding part and the lifting part in a state of standing with respect to an installation surface 400. The holding part includes a plurality of arm parts 1 extending from the lifting part and provided so as to support the lower surface, and a plurality of claw parts 2 protruding from each of the plurality of arm parts in a direction orthogonal to an extending direction of each of the plurality of arm parts and capable of coming into contact with each of the plurality of side surfaces.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a ceiling board holding device for holding a ceiling board, a ceiling board installation method using the ceiling board holding device, and a ceiling board maintenance method using the ceiling board holding device. [Background technology]

[0002] Generally, in the ceiling of a building or other structure, multiple ceiling boards are attached to support members. The clearance between two adjacent ceiling boards is small compared to the width of a human finger. Therefore, when installing or removing a ceiling board, a worker must climb up a stepladder, hold the underside of the ceiling board horizontally with one hand while positioning the ceiling board on the support member, and then use the other hand to fasten or remove screws that secure the ceiling board to the support member.

[0003] Japanese Patent Application Laid-Open Publication No. 2019-214086 (Patent Document 1) describes a board lifting device. The board lifting device described in Patent Document 1 includes a first U-shaped arm and a second U-shaped arm arranged with their curved portions facing each other, a first support connected to both ends of the second U-shaped arm and supporting one long side of the ceiling board, a base component arranged between the first U-shaped arm and the second U-shaped arm, a second support connected to one end of the base component and supporting one short side of the ceiling board, and a holding unit that includes multiple cover members connected to both ends of the first U-shaped arm or the other end of the base component and in contact with the underside of the ceiling board. The holding unit holds only one of the two long sides and two short sides of the ceiling board. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-214086 Summary of the Invention [Problem to be solved by the invention]

[0005] The holding portion of the board lifting device described in Patent Document 1 has difficulty in preventing the ceiling board from moving horizontally toward the first side not supported by the first support portion and the second side not supported by the second support portion. To prevent this movement, the worker needs to hold the ceiling board with one hand so as to prevent movement toward the first side and the second side. Therefore, even with the board lifting device described in Patent Document 1, it is difficult to sufficiently improve the stability of the ceiling board installation or removal work.

[0006] One object of the present disclosure is to provide a ceiling board holding device that can sufficiently improve the stability of the installation and removal work of ceiling boards.

[0007] Another object of the present disclosure is to provide a ceiling board installation method that improves the stability of the ceiling board installation and removal operations.

[0008] Another object of the present disclosure is to provide a method for maintaining ceiling boards that improves the stability of the installation and removal of ceiling boards. [Means for solving the problem]

[0009] The ceiling board holding device according to the present disclosure includes a holding section that holds a ceiling board having a bottom surface and a plurality of side surfaces connected to the outer edge of the bottom surface while the bottom surface is aligned horizontally, a lifting section that raises and lowers the holding section, and a support section that supports the holding section and the lifting section in an upright position relative to an installation surface. The holding section includes a plurality of arms extending from the lifting section and arranged to support the bottom surface, and a plurality of claws that protrude from each of the plurality of arms in a direction perpendicular to the extension direction of each of the plurality of arms and are capable of contacting each of the plurality of side surfaces.

[0010] A ceiling board installation method according to the present disclosure includes a first step of preparing a ceiling board holding device. The ceiling board holding device includes a holding unit that holds the ceiling board with its underside aligned horizontally, a lifting unit that raises and lowers the holding unit, and a support unit that supports the lifting unit in an upright position relative to the installation surface. The holding unit extends from the lifting unit and includes multiple arms that support the underside of the ceiling board, and multiple claws that protrude from each of the arms in a direction perpendicular to the extension direction of each of the arms and are capable of contacting each of the multiple side surfaces. In the first step, the support unit supports the lifting unit in an upright position relative to the installation surface, and the holding unit holds the ceiling board. The ceiling board installation method further includes a second step, after the first step, of raising the holding unit using the lifting unit to position the ceiling board at an installation location; a third step, after the second step, of fixing the ceiling board to the ceiling; and a fourth step, after the third step, of lowering the holding unit using the lifting unit.

[0011] The ceiling board maintenance method according to the present disclosure includes a fifth step of preparing a ceiling board holding device. The ceiling board holding device includes a holding unit that holds the ceiling board with its underside aligned horizontally, a lifting unit that raises and lowers the holding unit, and a support unit that supports the lifting unit in an upright position relative to the installation surface. The holding unit includes multiple arms extending from the lifting unit and configured to support the underside, and multiple claws that protrude from each of the multiple arms in a direction perpendicular to the extension direction of each of the multiple arms and are capable of contacting each of the multiple side surfaces. In the fifth step, the support unit supports the lifting unit in an upright position relative to the installation surface, and the holding unit is positioned below the ceiling board by the lifting unit so that each of the multiple arms is positioned below the underside and each of the multiple claws is positioned below the multiple side surfaces. The ceiling board maintenance method further includes a sixth step, after the fifth step, of raising the holding part using the lifting part to bring each of the multiple claw parts into contact with each of the multiple side surfaces; a seventh step, after the sixth step, of holding the ceiling board using the holding part by releasing the ceiling board from its fixation to the ceiling; and an eighth step, after the seventh step, of lowering the ceiling board using the lifting part. [Effects of the Invention]

[0012] According to the present disclosure, the stability of the installation and removal work of ceiling boards can be sufficiently improved. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing a ceiling board holding device according to an embodiment of the present invention; [Figure 2] 2 is a view of a first state of a holding portion of the ceiling board holding device shown in FIG. 1, viewed from below. FIG. [Figure 3] 1. FIG. 4 is a view of the second state of the holding portion of the ceiling board holding device shown in FIG. 1, viewed from below. [Figure 4] 2 is a diagram showing a state in which a holding portion of the ceiling board holding device shown in FIG. 1 is raised from that in FIG. 1. FIG. [Figure 5] 1. This is a diagram for explaining the holding part and the ceiling board when the holding part of the ceiling board holding device is in the first state and the lifting part is in the fourth state in the ceiling board installation method and ceiling board maintenance method using the ceiling board holding device shown in FIG. [Figure 6] FIG. 6 is a partially enlarged cross-sectional view taken along the arrows VI-VI in FIG. 5. [Figure 7] 2 is a diagram showing the ceiling board holding device shown in FIG. 1 in a folded state. FIG. [Figure 8] 2 is a view of the holding portion of the ceiling board holding device shown in FIG. 1 as seen from below. [Figure 9] 10 is a partially enlarged view showing a modified example of the holding portion of the ceiling board holding device according to the present embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The same reference numerals are used to designate the same components, and the description thereof will not be repeated. Each drawing introduces a first direction DR1 and a second direction DR2 that are aligned horizontally and perpendicular to each other, and a third direction DR3 that is aligned vertically.

[0015] <Example of ceiling board configuration> As shown in FIG. 1 , a ceiling board holding device 100 according to an embodiment is a device for holding a ceiling board 200. In this specification, a ceiling board 200 refers to any plate-like member included in the ceiling of a structure such as a building. The ceiling board 200 has a bottom surface 201 and a plurality of side surfaces 202. The bottom end of each of the plurality of side surfaces 202 is connected to the outer edge of the bottom surface 201. The side end of each of the plurality of side surfaces 202 is connected to the side end of another side surface 202.

[0016] The lower surface 201 of the ceiling board 200 is, for example, rectangular. Each of the multiple side surfaces 202 is, for example, rectangular. Each of the multiple side surfaces 202 is perpendicular to the lower surface 201 and perpendicular to each of the other two adjacent side surfaces 202.

[0017] The lower surface 201 of the ceiling board 200 is, for example, rectangular. Each of the multiple side surfaces 202 is, for example, rectangular. The lower surface 201 and each of the multiple side surfaces 202 have, for example, a longitudinal direction and a lateral direction. The multiple side surfaces 202 have, for example, two first side surfaces 202A (a first set of side surfaces, see FIG. 2) and two second side surfaces 202B (a second set of side surfaces, see FIG. 2). Each of the two first side surfaces 202A extends along the longitudinal direction of the lower surface 201 and faces opposite each other in the lateral direction of the lower surface 201. Each of the two second side surfaces 202B extends along the lateral direction of the lower surface 201 and faces opposite each other in the longitudinal direction of the lower surface 201. When the ceiling board 200 is properly attached to the ceiling, the longitudinal direction of the lower surface 201 is aligned with the first direction DR1, and the lateral direction of the lower surface 201 is aligned with the second direction DR2. The lateral direction of each of the side surfaces 202 is aligned with the third direction DR3.

[0018] The ceiling board 200 is attached to a ceiling support structure 300 (see FIG. 5) by a plurality of screws 210 (see FIG. 5). The ceiling board 200 is provided with a plurality of through holes 203 through which the plurality of screws 210 are passed. Each through hole 203 is opened, for example, near each corner of the lower surface 201. Note that each through hole 203 may be provided at any position on the ceiling board 200. When the ceiling board 200 is properly attached to the ceiling, it is arranged side by side with other ceiling boards 200 in each of the first direction DR1 and the second direction DR2. A clearance 220 (see FIG. 5) is set between two adjacent ceiling boards 200 in each of the first direction DR1 and the second direction DR2. The amount C of the clearance 220 (see FIG. 5) is smaller than the width of a human finger, for example.

[0019] The lower surface 201 of the ceiling board 200 may have any shape, such as a triangle, a pentagon, or a hexagon.

[0020] <Configuration of ceiling board holding device> 1 and 2 show a state in which a ceiling board holding device 100 holds a ceiling board 200. As shown in FIG. 1, the ceiling board holding device 100 includes a holding unit 10, a lifting unit 20, and a support unit 30.

[0021] The holding unit 10 is provided to hold a ceiling board 200 whose lower surface 201 is aligned horizontally. The holding unit 10 is provided to sandwich two first side surfaces 202A and two second side surfaces 202B. The lifting unit 20 is provided to raise and lower the holding unit 10. The support unit 30 is provided to support the holding unit 10 and the lifting unit 20 in an upright position relative to the installation surface 400.

[0022] 1 and 2, the holding unit 10 includes a plurality of arms 1 and a plurality of claws 2. Each of the arms 1 extends from the upper end of the lifting unit 20 and is provided to support the underside 201 of the ceiling board 200. Each of the claws 2 protrudes from each of the arms 1 in a direction perpendicular to the direction in which each of the arms 1 extends. Each of the claws 2 is capable of contacting a respective one of a plurality of side surfaces 202 of the ceiling board 200.

[0023] The multiple arms 1 include, for example, two first arms 1A (a first set of arms) and two second arms 1B (a second set of arms). Each of the two first arms 1A is arranged to extend along a first direction DR1. One first arm 1A extends on the opposite side of the other first arm 1A in the first direction DR1. Each of the two second arms 1B extends along a second direction DR2. One second arm 1B extends on the opposite side of the other second arm 1B in the second direction DR2. When viewed from a third direction DR3, each of the multiple arms 1 is arranged to form a cross shape.

[0024] Each of the arms 1 has a first end 11 connected to the corresponding claw 2 and a second end 12 connected to the upper end of the lifting unit 20. Each arm 1 has an upper surface 1C facing upward in the third direction DR3. The upper surface 1C of each arm 1 can come into contact with the lower surface 201 of the ceiling board 200.

[0025] Each of the claws 2 has an inner wall surface 2C facing inward in the first direction DR1 or the second direction DR2. The inner wall surface 2C of each of the claws 2 can come into contact with each of the side surfaces 202 of the ceiling board 200.

[0026] The plurality of claw portions 2 include, for example, two first claw portions 2A (first set of claw portions) and two second claw portions 2B (second set of claw portions). The two first claw portions 2A face each other in a first direction DR1. The two second claw portions 2B face each other in a second direction DR2. The two first claw portions 2A are arranged to sandwich the ceiling board 200 in the first direction DR1. An inner wall surface 2C of one first claw portion 2A can come into contact with one first side surface 202A of the ceiling board 200. An inner wall surface 2C of the other first claw portion 2A can come into contact with another first side surface 202A of the ceiling board 200. The two second claw portions 2B are arranged to sandwich the ceiling board 200 in the second direction DR2. An inner wall surface 2C of one second claw portion 2B can come into contact with one second side surface 202B of the ceiling board 200. An inner wall surface 2C of another second claw portion 2B can come into contact with another second side surface 202B of the ceiling board 200.

[0027] As shown in FIG. 1, the dimension H1 (protruding height) of each first claw portion 2A in the third direction DR3 is greater than the dimension W1 (width) of each first claw portion 2A in the first direction DR1. Similarly, the dimension (protruding height) of each second claw portion 2B in the third direction DR3 is greater than the dimension (width) of each second claw portion 2B in the second direction DR2. The dimension (protruding height) of each second claw portion 2B in the third direction DR3 is, for example, equal to the dimension H1 (protruding height) of each first claw portion 2A in the third direction DR3. The dimension (width) of each second claw portion 2B in the second direction DR2 is, for example, equal to the dimension (width) of each first claw portion 2A in the first direction DR1.

[0028] As shown in FIG. 2, the dimension W2 of each first claw portion 2A in the second direction DR2 is greater than the dimension W1 of each first claw portion 2A in the first direction DR1. Similarly, the dimension DR1 of each second claw portion 2B is greater than the dimension DR2 of each second claw portion 2B in the second direction DR2. The dimension DR1 of each second claw portion 2B is equal to the dimension W2 of each first claw portion 2A in the second direction DR2. The dimension DR2 of each second claw portion 2B is equal to the dimension W1 of each first claw portion 2A in the first direction DR1.

[0029] As shown in Figures 2 and 3, preferably, each of the multiple arms 1 is capable of changing the distance between its first end 11 and second end 12. Each arm 1 is configured to be extendable and contractible. Each arm 1 has a first portion 3, a second portion 4, and a first fixing portion 5. The first portion 3 is movable relative to the second portion 4. The first fixing portion 5 is capable of fixing the position of the first portion 3 relative to the second portion 4.

[0030] One end of the first portion 3 in the extension direction is connected to each of the claw portions 2. The other end of the first portion 3 in the extension direction is connected to one end of the second portion 4 in the extension direction. The other end of the second portion 4 in the extension direction is connected to the upper end of the lifting portion 20. The second portion 4 has, for example, a tubular portion that can accommodate at least a portion of the first portion 3. The tubular portion of the second portion 4 is open at the one end of the second portion 4. Note that the first portion 3 may have a tubular portion that can accommodate at least a portion of the second portion 4.

[0031] In each first arm 1A, the first portion 3 is movable relative to the second portion 4 in the first direction DR1. In each first arm 1A, the first fixing portion 5 is capable of fixing the position of the first portion 3 relative to the second portion 4 in the first direction DR1. In each second arm 1B, the first portion 3 is movable relative to the second portion 4 in the second direction DR2. In each first arm 1A, the first fixing portion 5 is capable of fixing the position of the first portion 3 relative to the second portion 4 in the first direction DR1.

[0032] The holding unit 10 is switchable between a first state shown in Figures 1 and 2 and a second state shown in Figure 3. In the first state, a distance L1 in the first direction DR1 between the plurality of claw portions 2 is equal to the width of the ceiling board 200 in the first direction DR1, and a distance L2 in the second direction DR2 between the plurality of claw portions 2 is equal to the width of the ceiling board 200 in the second direction DR2. In the second state, the distance L1 is greater than the width of the ceiling board 200 in the first direction DR1, and the distance L2 is greater than the width of the ceiling board 200 in the second direction DR2.

[0033] As shown in FIG. 2, in the first state, the holding portion 10 can be arranged so as not to overlap with any of the plurality of through-holes 203 of the ceiling board 200 in the third direction DR3.

[0034] The lifting unit 20 can be switched between a third state shown in FIG. 1 and a fourth state shown in FIG. 4. In the third state, the overall length of the lifting unit 20 in the third direction DR3 is shorter than in the fourth state, and the holding unit 10 is positioned lower. In the third state, the height H2 of the upper surface 1C of the holding unit 10 in the third direction DR3 relative to the installation surface 400 can be set to a height that allows a worker standing on the installation surface 400 to easily operate the holding unit 10. In the fourth state, the holding unit 10 can hold the ceiling board 200 attached to the ceiling. In the fourth state, the upper surface 1C of each arm 1 can contact the lower surface 201 of the ceiling board 200 attached to the ceiling, and the inner wall surfaces 2C of each claw portion 2 can contact each side surface 202 of the ceiling board 200 attached to the ceiling. In the fourth state, the height H3 of the upper surface 1C of the holding unit 10 in the third direction DR3 relative to the installation surface 400 is set to the height of the ceiling relative to the installation surface 400.

[0035] The lifting / lowering unit 20 may have any structure that can switch between the third state and the fourth state. The lifting / lowering unit 20 has, for example, a third section 21, a fourth section 22, and a second fixed section 23. The third section 21 is movable relative to the fourth section 22. The second fixed section 23 is capable of fixing the position of the third section 21 relative to the fourth section 22.

[0036] One end (upper end) of the third portion 21 in the extension direction is connected to the holding portion 10. The one end of the third portion 21 is connected to the first end 11 of each arm portion 1. The other end (lower end) of the third portion 21 in the extension direction is connected to one end (upper end) of the fourth portion 22 in the extension direction. The fourth portion 22 is connected to the support portion 30. The fourth portion 22 has, for example, a tubular portion that can accommodate at least a part of the third portion 21. The tubular portion of the fourth portion 22 opens to the one end of the fourth portion 22.

[0037] The holding unit 10 can be switched between the first state and the second state, and the lifting unit 20 can be switched between the third state and the fourth state while being supported by the support unit 30.

[0038] 5 and 6 are diagrams illustrating the holding unit 10 and the ceiling board 200 when the holding unit 10 is in the first state and the lifting unit 20 is in the fourth state. As shown in Fig. 5 and 6, the dimension W1 (width) of each first claw portion 2A in the first direction DR1 is smaller than the amount C of the clearance 220 in the first direction DR1 of the ceiling board 200. The dimension (width) of each second claw portion 2B in the second direction DR2 is smaller than the amount C of the clearance 220 in the second direction DR2 of the ceiling board 200.

[0039] The support unit 30 may have any structure capable of supporting the holding unit 10 and the lifting unit 20 in an upright state relative to the installation surface 400. The support unit 30 is provided, for example, so as to form a tripod together with the fourth portion 22 of the lifting unit 20. The support unit 30 includes, for example, three legs 31. One end (upper end) of each of the three legs 31 is connected to the fourth portion 22 of the lifting unit 20. The other end (lower end) of each of the three legs 31 is grounded.

[0040] The support unit 30 may be capable of adjusting the position on the installation surface 400 while supporting the holding unit 10 and the lifting unit 20 in an upright state relative to the installation surface 400. For example, the other end of each of the three legs 31 may include a caster with a locking mechanism.

[0041] As shown in FIG. 7, the ceiling board holding device 100 is preferably capable of realizing a stored state that is smaller in size than the unfolded state shown in FIGS.

[0042] As shown in FIG. 7, the holding unit 10 is preferably capable of realizing a first storage state in which each of the multiple arms 1 is folded. The holding unit 10 is preferably switchable between a first unfolded state in which each arm 1 is unfolded so as to extend horizontally as shown in FIGS. 1 to 6, and the first storage state as shown in FIG. 7. The holding unit 10 is configured to hold the ceiling board in the first unfolded state. The holding unit 10 further includes, for example, multiple connecting units 6. The multiple connecting units 6 are switchable between at least the first unfolded state and the first storage state. The multiple connecting units 6 may be configured to rotatably connect the first end 11 of each arm 1 to the one end of the third section 21. In FIG. 7, the lifting unit 20 is in the state in which its overall length is shortest.

[0043] As shown in Fig. 7, the support unit 30 is preferably capable of realizing a second stored state in which each of the plurality of leg units 31 is folded. In this case, the support unit 30 is switchable between the second unfolded state shown in Figs. 1 and 4 in which the plurality of leg units 31 are unfolded to raise the lifting unit 20, and the second stored state shown in Fig. 7. The support unit 30 is configured to support the lifting unit 20 in the second unfolded state.

[0044] In the ceiling board holding device 100, each arm 1 of the holding unit 10 is configured to be extendable. As shown in FIG. 8, such a holding unit 10 can also hold a ceiling board 250 that is different in at least one of shape and dimensions from the ceiling board 200. The lower surface 251 of the ceiling board 250 has, for example, a square shape. Each claw 2 of the holding unit 10 can come into contact with each side surface 252 of the ceiling board 250.

[0045] The ceiling board holding device 100 is suitable for both the method for installing the ceiling board 200 and the method for maintaining the ceiling board 200. The method for installing the ceiling board and the method for maintaining the ceiling board according to this embodiment will be described below.

[0046] <Ceiling board installation method> In the ceiling board installation method, a ceiling board 200 is attached to a ceiling using a ceiling board holding device 100.

[0047] First, the ceiling board holding device 100 is prepared (first step). The ceiling board holding device 100 is placed in the unfolded state. The support section 30 is placed in the second unfolded state. The support section 30 supports the lifting section 20 in an upright position relative to the installation surface 400 as shown in FIG. 1. The lifting section 20 is placed in the third state. The following work in this first step can be performed with the lifting section 20 supported by the support section 30 in the third state. The worker can perform all of the work in this first step without climbing onto a stepladder.

[0048] In this first step, the holding unit 10 is placed in the first deployed state. As shown in Figures 1 and 2, the holding unit 10 holds the ceiling board 200 to be attached to the ceiling. For example, the holding unit 10 is first placed in the second state shown in Figure 3. Next, the ceiling board 200 is placed on each upper surface 1C of the multiple arms 1 of the holding unit 10 in the second state. Next, the holding unit 10 is placed in the first state shown in Figures 1 and 2. This allows the holding unit 10 to hold the ceiling board 200. The holding unit 10 is positioned so as not to block each of the multiple through holes 203 of the ceiling board 200 held by the holding unit 10.

[0049] Second, the holding unit 10 is raised by the lifting unit 20 to position the ceiling board 200 at the location where it is to be installed (second step). The lifting unit 20 is switched from the third state to the fourth state shown in FIG. 3. The holding unit 10 is set to the first state shown in FIGS. 5 and 6. As shown in FIGS. 5 and 6, the holding unit 10 is positioned so as not to interfere with the ceiling board 200 and support structure 300 around the installation location and so as not to block the multiple through holes 203 in the ceiling board 200. Each of the multiple claws 2 is positioned within the clearance 220.

[0050] Third, the ceiling board 200, which has been positioned at the location where it should be installed by the ceiling board holding device 100, is fixed to the ceiling (third step). The worker passes screws 210 through each of the through holes 203 and tightens them. The worker can perform this third step without climbing up onto a stepladder and holding the ceiling board 200 with one hand.

[0051] Fourth, the holding unit 10 is lowered by the lifting unit 20 (fourth step). As described above, according to the ceiling board installation method of this embodiment, the ceiling board 200 can be attached to the ceiling using the ceiling board holding device 100. If it is necessary to attach another ceiling board 200 to the ceiling, after this fourth step, the above-mentioned steps 1 to 4 can be performed again in order. If it is not necessary to attach another ceiling board 200 to the ceiling, after this fourth step, the ceiling board holding device 100 can be placed in the stored state shown in FIG.

[0052] <Ceiling board maintenance method> In the ceiling board maintenance method, the ceiling board 200 is removed from the ceiling using the ceiling board holding device 100.

[0053] First, the ceiling board holding device 100 is prepared (step 5). The ceiling board holding device 100 is placed in the unfolded state. The support section 30 is placed in the second unfolded state. The support section 30 supports the lifting section 20 in an upright position relative to the installation surface 400 as shown in FIG. 1. The lifting section 20 is placed in the third state. The following work in this step 5 can be performed with the lifting section 20 supported by the support section 30 in the third state. The worker can perform all of the work in this step 5 without climbing onto a stepladder.

[0054] In this fifth step, the holding unit 10 is placed in the first deployed state. As shown in Figures 1 and 2, the holding unit 10 is placed in a state where it can hold the ceiling board 200 to be attached to the ceiling. The holding unit 10 is positioned so as not to block any of the multiple through holes 203 in the ceiling board 200 to be removed.

[0055] Second, the lifting unit 20 raises the holding unit 10, and positions the holding unit 10 at a location where it can hold the ceiling board 200 to be removed (sixth step). The lifting unit 20 is switched from the third state to the fourth state shown in FIG. 3. The holding unit 10 is set to the first state. As shown in FIGS. 5 and 6, the holding unit 10 is positioned so as not to interfere with the ceiling board 200 and the support structure 300 around the attachment location and so as not to block the multiple through holes 203 in the ceiling board 200. Each of the multiple claws 2 is positioned within the clearance 220. The holding unit 10 is set to a state in which the upper surface 1C of each arm 1 contacts the lower surface 201 of the ceiling board 200 to be removed, and the inner wall surface 2C of each claw contacts each side surface 202 of the ceiling board 200 to be removed.

[0056] Third, the ceiling board 200 is released from the ceiling (seventh step). The worker removes the multiple screws 210 that have been used to fasten the ceiling board 200 to be removed to the ceiling. The worker can perform this seventh step without climbing onto a stepladder and holding the ceiling board 200 with one hand. In this way, the ceiling board 200 is held by the holding part 10.

[0057] Fourth, the holding unit 10 is lowered by the lifting unit 20 (eighth step). As described above, according to the ceiling board maintenance method of this embodiment, the ceiling board 200 can be removed from the ceiling using the ceiling board holding device 100. When attaching the removed ceiling board 200 or a new ceiling board 200 to the ceiling, the above-described ceiling board 200 installation method can be carried out after this eighth step.

[0058] <Effects> Next, the effects of the ceiling board holding device 100 according to this embodiment will be described in comparison with a comparative example. The comparative example is the board lifting device described above, in which two support members are provided to support only two mutually perpendicular side surfaces. In the comparative example, one long side of the ceiling board is positioned lower than the other long side, and the underside of the ceiling board is tilted relative to the horizontal direction. The ceiling board must be rotated by the connecting member to adjust the underside of the ceiling board to be horizontal. This adjustment must be performed while preventing the ceiling board from moving horizontally toward the side not supported by the first and second support members. Therefore, in the comparative example, the worker must hold the ceiling board with one hand to prevent movement toward the first and second sides. Therefore, even with the board lifting device described in Patent Document 1, it is difficult to sufficiently improve the stability of the ceiling board installation or removal work.

[0059] In contrast, in the ceiling board holding device 100, the holding unit 10 includes a plurality of arms 1 arranged to support the underside 201, and a plurality of claws 2 protruding from each of the arms 1 in a direction perpendicular to the extension direction of each of the arms 1 and capable of contacting each of the side surfaces 202. This holding unit 10 can prevent the ceiling board 200 from shifting in position in each of the first direction DR1, the second direction DR2, and the third direction DR3. Therefore, in the ceiling board installation and maintenance method using the ceiling board holding device 100, a worker can install or remove the ceiling board 200 without holding the ceiling board 200 with one hand. As a result, the ceiling board holding device 100 can significantly improve the stability of the ceiling board installation and removal operations compared to the board lifting device described above, in which two support units are arranged to support only two of the side surfaces that are perpendicular to each other.

[0060] Furthermore, in the ceiling board holding device 100, the holding unit 10 holds the ceiling board 200 with its underside 201 aligned horizontally, and the lifting unit 20 can raise and lower the holding unit 10 while it is holding the ceiling board 200 or while it is capable of holding the ceiling board 200. Such a ceiling board holding device 100 can prevent the undersides 201 of the ceiling board 200 from tilting relative to the horizontal before installation or after removal. Therefore, the ceiling board holding device 100 can prevent a ceiling board 200 whose underside 201 is tilted relative to the horizontal from being attached to a ceiling. If a ceiling board 200 whose underside 201 is tilted relative to the horizontal is attached to a ceiling, problems such as deformation of the screws 210 or cracking of the ceiling board 200 may occur. The ceiling board holding device 100 can prevent the above-mentioned problems from occurring because the ceiling board 200 held by the holding unit 10 can be attached to the ceiling with the lower surface 201 aligned horizontally. Furthermore, the ceiling board holding device 100 can lower the ceiling board 200 removed from the ceiling without tilting the lower surface 201 relative to the horizontal, thereby preventing dust and the like from falling onto the upper surface of the ceiling board 200.

[0061] In the ceiling board holding device 100, the first claw portion 2A is provided to clamp the ceiling board 200 in the first direction DR1, and the second claw portion 2B is provided to clamp the ceiling board 200 in the second direction DR2. Such a holding unit 10 can more reliably prevent the ceiling board 200 from shifting in position in each of the first direction DR1, the second direction DR2, and the third direction DR3.

[0062] In the ceiling board holding device 100, the dimension H1 (protruding height) in the third direction DR3 of each first claw portion 2A is greater than the dimension W1 in the first direction DR1 of each first claw portion 2A. The dimension in the third direction DR3 of each second claw portion 2B is greater than the dimension in the second direction DR2 of each second claw portion 2B. Such a claw portion 2 can be positioned within the clearance 220 between the ceiling boards 200 on the ceiling, even though it has a portion that protrudes above the ceiling board 200 whose lower surface 201 is in contact with the upper surface 1C. The holding unit 10, which includes such first claw portion 2A and second claw portion 2B, can properly position the ceiling board 200 at the attachment location and can properly hold the ceiling board 200 when it is removed.

[0063] In the ceiling board holding device 100, the dimension W2 of each first claw portion 2A in the second direction DR2 is larger than the dimension W1 of each first claw portion 2A in the first direction DR1. The dimension of each second claw portion 2B in the first direction DR1 is larger than the dimension of each second claw portion 2B in the second direction DR2. In a holding unit 10 including such first claw portions 2A and second claw portions 2B, the inner wall surface 2C is larger than when the dimension W2 is equal to or smaller than the dimension W1, and it is possible to more reliably prevent the ceiling board 200 from shifting in position in each of the first direction DR1, the second direction DR2, and the third direction DR3.

[0064] In the ceiling board holding device 100, each arm 1 can change the distance between its first end 11 and second end 12. In the holding unit 10 including such arm units 1, by changing the distance between the first end 11 and second end 12 of each arm unit 1, it is possible to easily switch between the first state in which the ceiling board 200 can be held and the second state in which the ceiling board 200 can be opened. Furthermore, in the holding unit 10 including such arm units 1, it is possible to easily switch between the first state in which the ceiling board 250, which is different from the ceiling board 200 in at least one of dimensions and shape, can be held, and the second state in which the ceiling board 250 can be opened. Therefore, the ceiling board holding device 100 has high versatility.

[0065] In the ceiling board holding device 100, the holding unit 10 can switch between a first stored state in which each of the multiple arms 1 is folded, and a first unfolded state in which each of the multiple arms 1 is unfolded. Because this ceiling board holding device 100 can be transported and stored in the first stored state, it can be transported and stored more efficiently than when the first stored state cannot be realized.

[0066] In the ceiling board holding device 100, the support section 30 can be switched between a second stored state in which it is folded and a second unfolded state in which it is unfolded and raises the lifting section 20. Because such a ceiling board holding device 100 can be transported and stored in the second stored state, it can be transported and stored more efficiently than when the second stored state cannot be realized.

[0067] In particular, the ceiling board holding device 100 that can simultaneously realize the first and second storage states can be transported and stored in the storage state shown in Fig. 7, and therefore can be transported and stored more efficiently than when the storage state shown in Fig. 7 cannot be realized. With the ceiling board holding device 100, the space occupied by the ceiling board holding device 100 during transportation and storage can be made smaller than when the storage state shown in Fig. 7 cannot be realized.

[0068] In the ceiling board installation method according to this embodiment, the ceiling board 200 is held in a state in which the underside 201 is aligned horizontally by the holding part 10 of the ceiling board holding device 100, and is positioned at the installation location. This ceiling board installation method provides significantly improved stability in the work of installing and removing the ceiling board, compared to the ceiling board installation method using the board lifting device described above, in which two support parts are provided to support only two of the multiple side surfaces that are perpendicular to each other.

[0069] In the ceiling board maintenance method according to this embodiment, the holding part 10 of the ceiling board holding device 100 holds the ceiling board 200 to be removed in a state in which the underside 201 is aligned horizontally. This ceiling board maintenance method provides significantly improved stability in the work of installing and removing the ceiling board, compared to the ceiling board maintenance method using the board lifting device described above, in which the two support parts are provided to support only two of the multiple side surfaces that are perpendicular to each other.

[0070] <Modification of ceiling board holding device> As shown in Figure 9, in the ceiling board holding device 100, each claw 2 of the holding part 10 may have a protrusion 7 that protrudes inward relative to the inner wall surface 2C. Preferably, the protrusion 7 is retractable in the protruding direction. For example, at least one of each claw 2 and each protrusion 7 is elastically deformable in the protruding direction of the protrusion 7. Such a protrusion 7 can more reliably prevent the ceiling board 200 from shifting in the third direction DR3.

[0071] The embodiments and modifications disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0072] 1 Arm part, 1A First arm part, 1B Second arm part, 1C Top surface, 2 Claw part, 2A First claw part, 2B Second claw part, 2C Inner wall surface, 3 First part, 4 Second part, 5 First fixing part, 6 Connecting part, 7 Convex part, 10 Holding part, 11 First end part, 12 Second end part, 20 Lifting part, 21 Third part, 22 Fourth part, 23 Second fixing part, 30 Support part, 31 Leg part, 100 Ceiling board holding device, 200 Ceiling board, 201 Bottom surface, 202 Side surface, 202A First side surface, 202B Second side surface, 203 Through hole, 210 Screw, 220 Clearance, 300 Support structure, 400 Installation surface.

Claims

1. a holder that holds a ceiling board having a lower surface and a plurality of side surfaces connected to an outer edge of the lower surface in a state in which the lower surface is aligned horizontally; a lifting unit that lifts and lowers the holding unit; a support portion that supports the holding portion and the lifting portion in an upright state relative to an installation surface, The holding portion is a plurality of arms extending from the lifting section and configured to support the lower surface; A ceiling board holding device including a plurality of claw portions that protrude from each of the plurality of arm portions in a direction perpendicular to the extension direction of each of the plurality of arm portions and are capable of contacting each of the plurality of side surfaces.

2. Each of the plurality of claw portions includes a first set of claw portions arranged to face each other in a first direction along the horizontal direction, and a second set of claw portions arranged to face each other in a second direction along the horizontal direction and perpendicular to the first direction, the first set of claw portions is provided to clamp the ceiling board in the first direction, The ceiling board holding device according to claim 1 , wherein the second set of claw portions are arranged to clamp the ceiling board in the second direction.

3. the plurality of arms include a first set of arms and a second set of arms; the first set of arms are arranged to extend in the first direction; the second set of arms are arranged to extend in the second direction; the first set of claw portions protrude from each of the first set of arm portions in a third direction perpendicular to each of the first direction and the second direction; the second set of claws protrude in the third direction from each of the second set of arms, a dimension of each of the first set of claw portions in the third direction is greater than a dimension of each of the first set of claw portions in the first direction; The ceiling board holding device according to claim 2 , wherein the dimension of each of the second set of claw portions in the third direction is greater than the dimension of each of the second set of claw portions in the second direction.

4. a dimension of each of the first set of claw portions in the second direction is greater than a dimension of each of the first set of claw portions in the first direction; The ceiling board holding device according to claim 3 , wherein the dimension of each of the second set of claw portions in the first direction is greater than the dimension of each of the second set of claw portions in the second direction.

5. A ceiling board holding device as described in any one of claims 1 to 4, wherein each of the multiple arm portions has a first end connected to the lifting portion and a second end connected to each of the multiple claw portions, and the distance between the first end and the second end is changeable.

6. The ceiling board holding device described in claim 5, wherein the holding portion is switchable between a first stored state in which each of the multiple arms is folded and a first expanded state in which each of the multiple arms is expanded, and is configured to hold the ceiling board in the first expanded state.

7. A ceiling board holding device as described in any one of claims 1 to 4, wherein the support portion is switchable between a second stored state in which it is folded and a second expanded state in which it is expanded and the lifting portion is upright, and is configured to support the lifting portion in the second expanded state.

8. A method for installing a ceiling board having a lower surface and a plurality of side surfaces connected to an outer edge of the lower surface, comprising: A first step of preparing a ceiling board holding device is provided, The ceiling board holding device a holding portion that holds the ceiling board with the lower surface aligned horizontally; a lifting unit that lifts and lowers the holding unit; a support unit that supports the lift unit in an upright position relative to an installation surface, The holding portion is a plurality of arms extending from the lifting section and configured to support the lower surface; a plurality of claw portions projecting from each of the plurality of arm portions in a direction perpendicular to the extension direction of each of the plurality of arm portions and capable of contacting each of the plurality of side surfaces, In the first step, the support portion supports the lifting portion in an upright state relative to the installation surface, and the holding portion holds the ceiling board, a second step of, after the first step, raising the holding part by the lifting part and positioning the ceiling board at an attachment location; a third step of fixing the ceiling board to the ceiling after the second step; The ceiling board installation method further comprises a fourth step of lowering the holding portion by the lifting portion after the third step.

9. 1. A method for maintaining a ceiling board having a lower surface and a plurality of side surfaces connected to an outer edge of the lower surface, comprising: A fifth step of preparing a ceiling board holding device is provided. The ceiling board holding device a holding portion that holds the ceiling board with the lower surface aligned horizontally; a lifting unit that lifts and lowers the holding unit; a support unit that supports the lift unit in an upright position relative to an installation surface, The holding portion is a plurality of arms extending from the lifting section and configured to support the lower surface; a plurality of claw portions projecting from each of the plurality of arm portions in a direction perpendicular to the extension direction of each of the plurality of arm portions and capable of contacting each of the plurality of side surfaces, In the fifth step, the support portion supports the lifting / lowering portion in an upright state relative to the installation surface, and the holding portion is positioned below the ceiling board by the lifting / lowering portion so that each of the plurality of arm portions is located below the lower surface and each of the plurality of claw portions is located below the plurality of side surfaces; a sixth step of, after the fifth step, raising the holding part by the lifting part to bring each of the plurality of claw parts into contact with each of the plurality of side surfaces; a seventh step of, after the sixth step, releasing the ceiling board from the ceiling to hold the ceiling board by the holding portion; The ceiling board maintenance method further comprises, after the seventh step, an eighth step of lowering the ceiling board by the lifting unit.

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