Ceiling panel

Abstract

To provide a ceiling panel which can improve fixing strength of a member fixed to an end of a panel body while achieving simplification of the structure.SOLUTION: A ceiling panel 1 includes a panel body 10, and held members 11 which are fixed to the ends on both sides in a first direction of the panel body, have long shapes extending in a second direction perpendicular to the first direction and are held by a ceiling substrate 2, wherein the held member has a groove bottom piece part 13 for partitioning a groove bottom of a reception groove 12 receiving the end, a first side piece part 14 for partitioning one side in the groove width direction of the reception groove, and a second side piece part 16 which has a dimension W2 in the groove depth direction smaller than a dimension W1 in the groove depth direction of the first side piece part, and partitions the other side in the groove width direction of the reception groove, and in the second side piece part, reservoir grooves 17 of an adhesive 8 for fixing the held members to the ends are opened toward the first side piece part and extend in the second direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to ceiling panels. [Background technology]

[0002] BACKGROUND ART Ceiling panels that are installed on various installation targets have been known. For example, Patent Document 1 below discloses a structure in which a rail is fixed to a rail fixture fixed to a ceiling and a wall surface, and a rail is fixed to a wall panel fixture fixed to the wall surface, and the rail is provided with a ceiling panel fitting portion having upper and lower plate pieces into which the side end of the ceiling panel is fitted. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-234524 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the structure described in Patent Document 1 requires the provision of wires to secure the ceiling panel to the rails, and wire fixing portions to secure the wires to the rails, so further improvements are desired.

[0005] The present disclosure has been made in consideration of the above-mentioned situation, and aims to provide a ceiling panel that can improve the fixing strength of components fixed to the end of the panel body while simplifying the structure. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the ceiling panel of the present disclosure comprises a panel body, and a retained member that is fixed to both ends of the panel body in a first direction, is elongated and extends in a second direction perpendicular to the first direction, and is held to a ceiling substructure, and the retained member comprises a groove bottom piece portion that defines the groove bottom of a receiving groove that receives the end portion, a first side piece portion that defines one side of the receiving groove in the groove width direction, and a second side piece portion that has a groove depth dimension smaller than the groove depth dimension of the first side piece portion and defines the other side of the receiving groove in the groove width direction, and the second side piece portion has an adhesive reservoir groove that fixes the retained member to the end portion, the adhesive reservoir groove opening toward the first side piece portion and extending in the second direction. [Effects of the Invention]

[0007] The ceiling panel according to the present disclosure has the above-described configuration, which allows for a simplified structure while improving the fixing strength of the members fixed to the end portions of the panel body. [Brief explanation of the drawings]

[0008] [Figure 1] 1A and 1B are schematic views of an example of a ceiling panel according to an embodiment of the present disclosure, where FIG. 1A is a partially cutaway, schematic exploded vertical cross-sectional view, and FIG. 1B is a partially cutaway, schematic vertical cross-sectional view. [Figure 2] FIG. 2 is a schematic perspective view of the ceiling panel. [Figure 3] FIG. 2 is a partially cutaway schematic vertical cross-sectional view showing the ceiling panel after installation. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In some drawings, some of the detailed reference numerals used in other drawings are omitted. In the following embodiment, directions such as the up-down direction will be described based on the state in which an example of a ceiling panel according to this embodiment is installed. 1 to 3 are diagrams schematically showing an example of a ceiling panel according to the present embodiment and an example of a ceiling panel installation structure using the same ceiling panel.

[0010] As shown in FIGS. 2 and 3 , the ceiling panel 1 according to this embodiment includes a panel main body 10 and retained members 11, 11 fixed to both ends of the panel main body 10 in a first direction, elongated and extending in a second direction perpendicular to the first direction, and retained by a ceiling substrate 2. The retained members 11, 11 on both sides in the first direction of the ceiling panel 1 are retained by a pair of frames 2a, 2a constituting the ceiling substrate 2. These frames 2a, 2a may be configured to be suspended from a frame such as an upper slab or steel frame, which serves as a suspension point, using hangers 2e and suspension bolts 2f as suspension members. Some of the multiple hangers 2e may be fitted with brace fixtures 2g to which the lower ends of braces (not shown) are attached. An example of a specific configuration of the frame 2a will be described later.

[0011] This ceiling panel 1 may also be an equipment mounting panel for mounting various types of equipment 6 between other ceiling panels 7, 7 arranged adjacently on both sides of it in the first direction. The equipment 6 mounted on this ceiling panel 1 is not limited to a fire detector as shown in the illustration, but may also be lighting fixtures, audio equipment, fans, drying devices, storage devices, etc., or various other types of facility equipment. This ceiling panel 1 may be installed as a ceiling for relatively small buildings such as residences and offices, or may be installed as a ceiling for various relatively large buildings such as gymnasiums, halls, shopping malls, factories, and schools. The other ceiling panels 7, 7 arranged on both sides of the ceiling panel 1 in the first direction may be held by appropriate sill supports suspended from similar hanging members and held by sills 3, 3 arranged to extend in the first direction. These other ceiling panels 7, 7 may be rectangular flat plates with standard dimensions. These other ceiling panels 7, 7 may have a length along the first direction of approximately 600 mm to 3000 mm, a width along the second direction of approximately 300 mm to 1200 mm corresponding to the pitch of the sills 3, and a thickness of approximately 3.0 mm to 20.0 mm.

[0012] The ceiling panel 1 is shaped like a substantially rectangular flat plate that is long in the second direction. The length of the ceiling panel 1 in the second direction may be, for example, about 600 mm to 2000 mm. The length of the ceiling panel 1 in the second direction may be about twice the width of the other ceiling panels 7 in the second direction. When various devices 6 are installed on the underside of the ceiling panel 1, the width of the ceiling panel 1 in the first direction may be a dimension corresponding to the dimensions of the devices 6, and may be, for example, about 150 mm to 600 mm. The thickness of the ceiling panel 1 may be about the same as the thickness of the other ceiling panels 7. The panel body 10 has a rectangular flat plate shape that is elongated in the second direction. The panel body 10 may be a board that is generally used as a ceiling board. The panel body 10 may be formed from the same panel material as the other ceiling panels 7, or may be formed from a different panel material. The panel body 10 may be made of, for example, a relatively fragile gypsum board, calcium silicate board, foam resin board, or the like, so that holes can be easily drilled at the construction site for the installation of the equipment 6, wiring, etc.

[0013] As shown in FIG. 1 , the retained member 11 includes a groove bottom piece 13 defining the groove bottom of the receiving groove 12 that receives the end of the panel body 10 in the first direction; a first side piece 14 defining one side of the receiving groove 12 in the groove width direction; and a second side piece 16 defining the other side of the receiving groove 12 in the groove width direction. The dimension W2 of the second side piece 16 in the groove depth direction (the groove depth direction of the receiving groove 12) is smaller than the dimension W1 of the first side piece 14 in the groove depth direction. With this configuration, by arranging the ceiling panel 1 so that the second side piece 16 faces the interior side, as shown in the figure, the retained member 11 can be made less noticeable from the interior side. Furthermore, when various types of equipment 6, such as facility devices, are installed on the interior side (underside) of the ceiling panel 1, interference between the second side piece 16 and the equipment 6 can be suppressed. In other words, the equipment installation space between the second side pieces 16, 16 of the held members 11, 11 provided on both sides of the ceiling panel 1 in the first direction can be effectively increased, making the ceiling panel 1 suitable for installing equipment 6.

[0014] The second side piece 16 has a reservoir groove 17 for the adhesive 8 that secures the held member 11 to the end of the panel body 10 in the first direction. The reservoir groove 17 opens toward the first side piece 14 and extends in the second direction. This configuration allows the held member 11 to be secured to the end of the panel body 10 with the adhesive 8, simplifying the structure compared to configurations requiring wires or the like. Furthermore, the reservoir groove 17 is provided in the second side piece 16, which has a smaller dimension W2 in the groove depth direction, and the dimension W1 in the groove depth direction of the first side piece 14 is larger than the dimension W2 in the groove depth direction of the second side piece 16. Therefore, the adhesive area is secured on the first side piece 14 side, and the adhesive 8 is prevented from spilling out on both sides while the dimension W2 in the groove depth direction of the second side piece 16 is reduced. This prevents the appearance from being impaired.

[0015] The first side piece 14 and the second side piece 16 are provided with protrusions 15, 18 that protrude in directions facing each other and extend in the second direction (first protrusion 15 as a protrusion of the first side piece 14 and second protrusion 18 as a protrusion of the second side piece 16). With this configuration, the first protrusion 15 and second protrusion 18 of the first side piece 14 and the second side piece 16 can ensure a gap for forming the adhesive layer 9 with the panel main body 10, while also preventing the held member 11 from tilting around an axis along the second direction relative to the panel main body 10. The second side piece 16 has a second protrusion 18 provided closer to the groove opening (groove opening of the receiving groove 12) than the reservoir groove 17. With this configuration, the second protrusion 18 can more effectively prevent the adhesive 8 from spilling out from the groove opening side of the second side piece 16. The protrusion dimension H1 of the first protrusion 15 is larger than the protrusion dimension H2 of the second protrusion 18. With this configuration, the gap formed between the panel body 10 and the first side piece 14 becomes larger on the first side piece 14 side, which makes it easier for the adhesive 8 to flow toward the first side piece 14 side, and makes it possible to more effectively prevent the adhesive 8 from spilling out on the second side piece 16 side.

[0016] The first side piece 14 is provided with first protrusions 15, 15 at multiple locations in the groove depth direction, and the second side piece 16 is provided with a second protrusion 18 on the groove opening side so as to be positioned between two of these first protrusions 15, 15 in the groove depth direction. With this configuration, the end of the panel main body 10 can be held by being sandwiched between at least the two first protrusions 15, 15 of the first side piece 14 and the second protrusion 18 on the groove opening side of the second side piece 16. Furthermore, since the second protrusion 18 on the groove opening side of the second side piece 16 is provided so as to be positioned between the two first protrusions 15, 15 of the first side piece 14, tilting of the held member 11 around an axis along the second direction relative to the panel main body 10 can be more effectively prevented. Furthermore, compared to a configuration in which the second protrusion 18 of the second side piece 16 and the first protrusions 15, 15 of the first side piece 14 are formed at the same position in the groove depth direction, the end of the panel main body 10 can be inserted smoothly into the receiving groove 12.

[0017] 2, the held members 11, 11 on both sides in the first direction are provided so as to cover both ends in the first direction of the panel main body 10 over substantially the entire length in the second direction. These held members 11, 11 on both sides in the first direction have the same configuration, so one of them will be used as an example to explain an example of the specific configuration below. The held member 11 has a generally uniform shape over its entire length. The held member 11 may be an extrusion molded product made of a metal material or a synthetic resin material and having a generally uniform cross-sectional shape over its entire length. 1(a) and 1(b), the receiving groove 12 opens toward the center of the panel width direction of the panel main body 10 and is provided so as to penetrate the entire length of the held member 11. This receiving groove 12 is in the shape of a substantially rectangular groove.

[0018] The groove bottom piece 13 is formed in a substantially plate shape with its thickness direction being the groove depth direction of the receiving groove 12 (the panel width direction of the panel main body 10). The first side piece 14 is provided so as to extend in the groove depth direction from an edge on one side (ceiling substrate side) of the groove bottom piece 13 in the groove width direction of the receiving groove 12 (the panel thickness direction of the panel main body 10). This first side piece 14 is generally plate-shaped, with its thickness direction being the groove width direction of the receiving groove 12. The dimension W1 of this first side piece 14 in the groove depth direction may be set appropriately from the perspectives of protecting the end of the panel main body 10, ensuring a sufficient bonding area, achieving weight reduction, etc. The dimension W1 of this first side piece 14 in the groove depth direction may be, for example, approximately 1.5 to 3 times the thickness dimension of the panel main body 10, or may be approximately 10 mm to 30 mm.

[0019] Two first protrusions 15, 15 are provided on the first side piece 14 with a gap between them in the groove depth direction. In the illustrated example, these two first protrusions 15, 15 include a first protrusion 15 located slightly closer to the groove bottom than the center of the first side piece 14 in the groove depth direction, and a first protrusion 15 located slightly closer to the groove bottom than the groove opening end, which is the tip end in the extension direction of the first side piece 14. These two first protrusions 15, 15 have similar configurations, so one of them will be described below as an example. The first side surface 15a of the first protrusion 15 facing the groove bottom side is parallel to the groove bottom surface, that is, is a vertical surface that is approximately perpendicular to the first side piece portion 14. With this configuration, it is possible to effectively prevent the adhesive 8 applied to the groove bottom side from flowing out toward the groove opening side. The second side surface 15b of the first protrusion 15 facing the groove opening side is an inclined surface that slopes toward the groove opening side from the tip end side in the protruding direction toward the base end side. With this configuration, the end of the panel main body 10 inserted from the groove opening side can be smoothly inserted into the groove bottom side. In the illustrated example, the first protrusion 15 is substantially triangular when viewed in the longitudinal direction of the held member 11. In other words, the first side surface 15a and the second side surface 15b are configured to intersect at a vertex that is the tip end of the first protrusion 15 in the protruding direction.

[0020] The protrusion dimension H1 of the first protrusion 15 may be set to an appropriate dimension from the viewpoint of suppressing tilt of the held member 11 relative to the panel body 10 and from the viewpoint of ensuring a gap for forming the adhesive layer 9. The protrusion dimension H1 of the first protrusion 15 may be approximately 0.1 mm to 1.0 mm, and preferably approximately 0.2 mm to 0.5 mm. The number and shape of the first protrusions 15 provided on the first side piece 14 are not limited to those described above. For example, one first protrusion 15 may be provided on the first side piece 14, or three or more first protrusions 15 may be provided at intervals in the groove depth direction. Furthermore, the protrusion dimension H1 of each of the multiple first protrusions 15 may be increased, for example, toward the groove opening side, or the protrusion dimension H1 of the first protrusion 15 on the groove opening side may be larger than the protrusion dimension H1 of the other first protrusions 15, and various other modifications are possible.

[0021] The second side piece 16 is provided to extend in the groove depth direction from the edge of the groove bottom piece 13 on the other side (indoor side) in the groove width direction of the receiving groove 12. The second side piece 16 is generally plate-shaped, with its thickness direction being the groove width direction of the receiving groove 12. The dimension W2 of the second side piece 16 in the groove depth direction may be set appropriately from the perspectives of protecting the end of the panel main body 10, ensuring a sufficient bonding area, and achieving weight reduction. The dimension W2 of the second side piece 16 in the groove depth direction may be, for example, approximately 1 / 4 to 3 / 4 of the dimension W1 of the first side piece 14 in the groove depth direction, and in the illustrated example, is approximately 1 / 2 of the dimension W1 of the first side piece 14 in the groove depth direction. In the illustrated example, the dimension (W1) in the groove depth direction of the first groove inner wall that forms the groove side surface of the first side piece portion 14 is approximately equal to the dimension in the groove width direction of the groove bottom surface that forms the groove side surface of the groove bottom piece portion 13 plus the dimension (W2) in the groove depth direction of the second groove inner wall that forms the groove side surface of the second side piece portion 14. With this configuration, when adhesive 8 is applied in a bead shape to the inside corner between the first groove inner wall and the groove bottom surface as in the illustrated example, the adhesive 8 tends to spread approximately uniformly to the first groove inner wall side, the groove bottom surface side, and the second groove inner wall side.

[0022] This second side piece 16 has reservoir grooves 17, 17, 17 formed at multiple locations in the groove depth direction. With this configuration, the adhesive 8 can be received in these reservoir grooves 17, 17, 17, and the adhesive 8 can be more effectively prevented from spilling out on the second side piece 16 side. The reservoir groove 17 is formed so as to widen toward the first side piece 14. The slope of the first groove side wall 17a on the groove bottom piece 13 side that defines the reservoir groove 17 is gentler than the slope of the second groove side wall 17b. With this configuration, the reservoir groove 17 can smoothly receive the adhesive 8 that flows from the groove bottom piece 13 side toward the tip end of the second side piece 16. Furthermore, since the reservoir groove 17 can be made shallow while maintaining the volume of the reservoir groove 17, a decrease in the strength of the second side piece 16 can be suppressed.

[0023] Specifically, three reservoir grooves 17, 17, 17 are provided in the second side piece portion 16. These reservoir grooves 17, 17, 17 are provided at equal intervals. In the illustrated example, one reservoir groove 17 of the three reservoir grooves 17, 17, 17 is provided so as to be located slightly closer to the groove bottom side than the center in the groove depth direction of the second side piece portion 16, and the remaining two reservoir grooves 17, 17 are provided so as to be located closer to the groove opening side than the center in the groove depth direction of the second side piece portion 16. These three reservoir grooves 17, 17, 17 have similar configurations, so the following description will be given taking one of them as an example. The first groove side wall 17a of the reservoir groove 17 is an inclined surface facing the groove opening side on the side of the first side piece portion 14. The gradient of this first groove side wall 17a (the gradient with the groove depth direction of the receiving groove 12 as the base and the groove width direction as the height) may be about 10% to 40%, and in the illustrated example is about 20%. The second groove side wall 17b of the reservoir groove 17 is an inclined surface facing the groove bottom on the side of the first side piece portion 14. The gradient of this second groove side wall 17b (the gradient with the groove depth direction of the receiving groove 12 as the base and the groove width direction as the height) may be about 80% to 200%, and is about 100% in the illustrated example.

[0024] In the illustrated example, the reservoir groove 17 has a V-groove shape when viewed in the longitudinal direction of the reservoir groove 17. That is, the first groove side wall 17a and the second groove side wall 17b intersect at the bottom of the reservoir groove 17. The depth dimension of this reservoir groove 17, which is in the same direction as the thickness direction of the second side piece 16, may be an appropriate dimension from the viewpoint of receiving the adhesive 8 and the strength of the second side piece 16, and may be, for example, approximately 0.1 mm to 0.5 mm. The number and shape of the reservoir grooves 17 are not limited to those described above, and for example, one or two reservoir grooves 17 may be provided in the second side piece portion 16, or four or more reservoir grooves 17 may be provided. Furthermore, the reservoir grooves 17 are not limited to a shape that widens toward the first side piece portion 14, and may be a substantially rectangular groove. Furthermore, instead of a mode in which multiple reservoir grooves 17 having a similar configuration are provided, a mode in which multiple reservoir grooves 17 are provided so that the volume increases toward the groove opening side of the receiving groove 12 may be used, and various other modifications are possible. In addition, although an example is shown in which no reservoir groove is provided in the first side piece 14 and the reservoir groove 17 is provided only in the second side piece 16, a reservoir groove may also be provided in the first side piece 14.

[0025] The second side piece 16 is provided with only a second protrusion 18 on the groove opening side. This second protrusion 18 is provided at the tip of the second side piece 16 in the extension direction. The first side surface 18a of this second protrusion 18 facing the groove bottom (groove bottom piece 13) is parallel to the groove bottom surface, i.e., a vertical surface that is approximately perpendicular to the second side piece 16. This configuration effectively prevents the adhesive 8 from flowing toward the groove opening side. This second protrusion 18 has a substantially rectangular shape when viewed in the groove longitudinal direction of the receiving groove 12. In other words, the tip surface of the second protrusion 18 in the extension direction is parallel to the second groove inner wall, which becomes the groove side surface of the second side piece 16, and the second side surface of the second protrusion 18 is flush with the tip surface of the second side piece 16 in the extension direction. Instead of this configuration, the second side surface of the second protrusion 18 may be an inclined surface generally similar to that of the first protrusion 15 described above.

[0026] The protrusion dimension H2 of the second protrusion 18 may be set to an appropriate dimension from the viewpoint of suppressing tilt of the held member 11 relative to the panel body 10 and from the viewpoint of ensuring a gap for forming the adhesive layer 9. The protrusion dimension H2 of the second protrusion 18 may be 0.05 mm or more, and may be approximately 1 / 5 to 4 / 5 of the protrusion dimension H1 of the first protrusion 18. The dimension in the panel thickness direction (thickness direction of the panel main body 10) from the tip of this second protrusion 18 to the tip of the first protrusion 15 may be the same as the thickness dimension of the panel main body 10, or may be slightly larger than the thickness dimension of the panel main body 10. The number and shape of the second protrusions 18 provided on the second side piece 16 are not limited to those described above. For example, two or more second protrusions 18 may be provided on the second side piece 16 at intervals in the groove depth direction. The positions of the first protrusions 15 and the second protrusions 18 provided on the first side piece 14 and the second side piece 16 are not limited to those described above, and may be various positions. Furthermore, instead of making the protrusion dimension H1 of the first protrusions 18 larger than the protrusion dimension H2 of the second protrusions 18, these may be approximately the same, or the protrusion dimension H1 of the first protrusions 18 may be smaller than the protrusion dimension H2 of the second protrusions 18. Furthermore, instead of providing the first protrusions 15 and the second protrusions 18 on both the first side piece 14 and the second side piece 16, protrusions may be provided on only one of them, or both may not have protrusions.

[0027] The held member 11 is provided with an engagement recess 19 into which an engagement protrusion 2c (see FIG. 3) provided on the mounting piece 2b of the frame 2a, which will be described later, is inserted. With this configuration, by inserting the engagement protrusion 2c into the engagement recess 19, the ceiling panel 1 can prevent the pair of frames 2a, 2a, which are each suspended and held by the hanging members, from moving apart. In addition, the ceiling panel 1, which is placed and temporarily held on the mounting piece 2b, 2b, can be prevented from unintentionally falling. The engagement recess 19 is provided so as to be located outside the receiving groove 12 in the first direction. This engagement recess 19 is formed in a groove shape that opens downward and extends the entire length of the held member 11. The groove depth dimension in the up-down direction and the groove width dimension in the first direction of this engagement recess 19 are set to appropriate dimensions so that the engagement protrusion 2c described below can be received. One side of the groove width direction of this engagement recess 19 is defined by the groove bottom piece 13 of the held member 11. The groove bottom of the engagement recess 19 is defined by a bottom piece extending outward in the first direction from a midpoint in the up-down direction of the groove bottom piece 13. The other side of the groove width direction of the engagement recess 19 is defined by an outer piece hanging down from the tip of the extending direction of the bottom piece. The example shown in the figure shows an example in which a lower end protrusion protruding outward in the first direction is provided from the lower end of the outer piece. This lower end protrusion is provided so that its lower surface (the interior side surface) is generally flush with the lower surface (the interior side surface) of the second side piece 16. The engagement recess 19 is not limited to the above configuration, and may have various other configurations.

[0028] The held member 11 is provided with a receiving recess that receives the shank of a fastener that penetrates the rising piece 2d of the frame 2a (described later). This receiving recess is groove-shaped, opening outward in the first direction (toward the rising piece 2d) and extending the entire length of the held member 11. The groove depth dimension of this receiving recess along the first direction and the groove width dimension along the vertical direction are appropriately determined so that the shank of the fastener that penetrates the rising piece 2d can be received. One side of the groove width direction of this receiving recess is defined by a bottom piece that defines the groove bottom of the engaging recess 19. The groove bottom of the receiving recess is defined by a groove bottom piece 13 and an extending side piece that extends upward so as to be continuous with the groove bottom piece. The other side of the groove width direction of the receiving recess is defined by an upper end protrusion that protrudes outward in the first direction from the upper end that is the tip of the extending side piece in the extending direction. In the illustrated example, an inner protruding piece is provided that protrudes inward in the first direction from the upper end of the extending side piece.

[0029] The thickness of each piece of the member to be held 11 may be set to an appropriate size from the viewpoint of weight reduction and strength, and may be, for example, about 1 mm to 3 mm. The adhesive 8 used to secure the retained member 11 to the end of the panel body 10 may be various adhesives, such as modified silicone adhesives or urethane adhesives. The illustrated example shows a bead-shaped adhesive applied to the recessed corner between the first side piece 14 and the groove bottom piece 13 (see FIG. 1(a)). The amount of adhesive 8 applied may be an appropriate amount so as to cover most of the inner walls on both sides of the receiving groove 12 in the groove width direction and not spill over onto the groove opening side. The illustrated example shows an example in which the adhesive layer 9 is formed from the groove bottom side of the first groove inner wall, which forms the groove side surface of the first side piece 14, to the first side surface 15a of the first protrusion 15 on the groove opening side (see FIG. 1(b)). The illustrated example also shows an example in which the adhesive layer 9 is formed from the groove bottom side of the second groove inner wall, which forms the groove side surface of the second side piece 16, to the first side surface 18a of the second protrusion 18 on the groove opening side.

[0030] The pair of frames 2a, 2a that hold both side ends in the first direction of the ceiling panel 1 configured as described above are configured to hold the ceiling panel 1 so as to position it higher than the other ceiling panels 7, 7 that are adjacent to it on both sides in the first direction, as shown in Figure 3. These frames 2a, 2a have similar configurations, so one of them will be explained below as an example. The frame 2a is provided with a mounting piece 2b on which a held member 11 constituting the end of the ceiling panel 1 in the first direction is placed, and a rising piece 2d that is provided so as to span in the first direction and to which a connecting member 5 is fixed that abuts against the upper surfaces of the held members 11, 11 on both sides in the first direction. The mounting piece 2b is provided with an engaging protrusion 2c in a cut-out shape that engages with the above-mentioned engaging recess 19 (see FIG. 1). The rising piece 2d is provided so as to rise upward from the outer edge of the mounting piece 2b in the panel width direction. The illustrated example shows an example in which a hanging piece is provided so as to hang downward from the edge of the mounting piece 2b on the center side in the panel width direction.

[0031] The frame 2a has an insertion hole through which the hook piece of the hanger 2e constituting the hanging member is inserted, and the suspended portion fixed to the hanger 2e is provided so as to be continuous with the upper side of the rising piece 2d. The illustrated example shows an example in which both ends in the first direction are fixed to the suspended portion of the frames 2a, 2a on both sides in the first direction and a spacing member 4 is provided to span the first direction. The pair of frames 2a, 2a that hold both side ends in the first direction of the ceiling panel 1 are not limited to the configuration described above and may have various other configurations. Also, the connecting member 5 and the spacing member 4 do not necessarily have to be provided. In the above example, the retained member 11 of the ceiling panel 1 is provided with a piece that forms an engagement recess 19 and a piece that forms a receiving recess, but it is sufficient if at least a groove bottom piece 13, a first side piece 14 and a second side piece 16 are provided. In the above example, the ceiling panel 1 is an equipment mounting panel on which various types of equipment can be mounted, but it may also be a ceiling panel that covers the entire surface or most of the ceiling surface. The components that make up the ceiling panel 1 are not limited to the configurations described above, and various other modifications are possible.

[0032] <Additional Notes> The above description of the embodiments discloses the following techniques related to ceiling panels. <Technology 1> The ceiling panel includes a panel body and a retained member that is fixed to both ends of the panel body in a first direction, has an elongated shape extending in a second direction perpendicular to the first direction, and is retained on a ceiling substrate. The retained member includes a groove bottom piece that defines the groove bottom of a receiving groove that receives the end of the panel body, a first side piece that defines one side of the receiving groove in the groove width direction, and a second side piece that has a dimension in the groove depth direction smaller than the dimension in the groove depth direction of the first side piece and defines the other side of the receiving groove in the groove width direction. The second side piece has a reservoir groove for adhesive that secures the retained member to the end of the panel body, the reservoir groove opening toward the first side piece and extending in the second direction. <Technology 2> The ceiling panel according to technique 1, wherein the second side piece is provided with a plurality of reservoir grooves in the groove depth direction. <Technology 3> The ceiling panel according to Technique 1 or 2, wherein the first side piece and the second side piece are provided with protrusions that protrude in directions facing each other and extend in the second direction. <Technology 4> The ceiling panel according to technique 3, wherein the second side piece has a protrusion provided closer to the groove opening side than the reservoir groove. <Technology 5> A ceiling panel described in Technology 4, in which protrusions are provided on the first side piece at multiple locations in the groove depth direction, and a protrusion on the groove opening side of the second side piece is provided so as to be positioned between two of these protrusions in the groove depth direction. <Technology 6> The ceiling panel according to any one of Techniques 3 to 5, wherein the protrusion formed on the first side piece has a larger protrusion dimension than the protrusion formed on the second side piece. <Technology 7> The ceiling panel according to any one of Techniques 1 to 6, wherein the reservoir groove is formed so as to widen toward the first side piece portion. <Technology 8> A ceiling panel according to Art 7, wherein the slope of the first groove side wall on the groove bottom piece side that defines the reservoir groove is gentler than the slope of the second groove side wall. [Explanation of symbols]

[0033] 1 Ceiling Panel 8. Adhesive 10 Panel body 11 Held member 12 Receiving groove 13 Groove bottom piece 14 First side piece 15 First protrusion (protrusion of first side piece) 16 Second side piece 17 Tamamizo 17a 1st groove side wall 17b 2nd groove side wall 18 Second protrusion (protrusion on the groove opening side of the second side piece) 2 Ceiling underlayment H1 Projection dimension of the first protrusion H2 Projection dimension of the second protrusion W1 Dimension of the groove depth of the first side piece W2 Dimension of the groove depth of the second side piece

Claims

1. The panel includes a panel body and a retained member that is fixed to both ends of the panel body in a first direction, has an elongated shape extending in a second direction perpendicular to the first direction, and is retained on a ceiling substrate; the held member includes a groove bottom piece portion that defines the groove bottom of the receiving groove that receives the end portion, a first side piece portion that defines one side of the receiving groove in the groove width direction, and a second side piece portion that defines the other side of the receiving groove in the groove width direction and has a dimension in the groove depth direction that is smaller than the dimension in the groove depth direction of the first side piece portion, A ceiling panel characterized in that the second side piece has a groove for retaining adhesive that fixes the held member to the end, the groove opening toward the first side piece and extending in a second direction.

2. In claim 1, A ceiling panel characterized in that the second side piece has the reservoir grooves formed at a plurality of locations in the groove depth direction.

3. In claim 1, The first side piece and the second side piece are provided with protrusions that protrude in directions facing each other and extend in a second direction, The ceiling panel is characterized in that the second side piece portion has the protrusion provided on the groove opening side of the reservoir groove.

4. In claim 3, A ceiling panel, wherein the protrusion formed on the first side piece has a larger protrusion dimension than the protrusion formed on the second side piece.

5. In claim 3 or 4, A ceiling panel characterized in that the protrusions are provided at multiple locations in the groove depth direction on the first side piece, and the protrusion on the groove opening side of the second side piece is provided so as to be positioned between two of these protrusions in the groove depth direction.

6. In claim 1, The ceiling panel is characterized in that the reservoir groove is formed so as to widen as it approaches the first side piece portion, and the slope of the first groove side wall on the groove bottom piece side that defines the reservoir groove is gentler than the slope of the second groove side wall.

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