Lighting fixtures and their installation methods

Abstract

The objective of this disclosure is to facilitate construction work. [Solution] The lighting fixture B1 comprises a light source unit A1, a fixture body 1 that holds the light source unit A1, and one or more mounting members 4 for attaching the light source unit A1 to the fixture body 1. The fixture body 1 has a plurality of top plates 10 arranged to surround the opening 100. The mounting members 4 have a plurality of mounting parts 41 that are placed on the plurality of top plates 10 through the opening 100.

Description

Technical Field

[0001] The present disclosure relates to a lighting fixture and a construction method thereof, and more particularly, to a lighting fixture attached to a suspended ceiling and a construction method for attaching the lighting fixture to the suspended ceiling.

Background Art

[0002] As a conventional example, the lighting fixture described in Patent Document 1 is exemplified. The lighting fixture described in Patent Document 1 (hereinafter referred to as the conventional example) is attached to a ceiling opening of a suspended ceiling formed by combining a plurality of so-called T-bars in a lattice pattern. The conventional example includes a fixture body and a light source unit. The fixture body has four side plates and is formed in a square frame shape. The light source unit has a frame, a cover, and a mounting portion. The frame is a long member that constitutes the outer outline of the light source unit, and a light-emitting substrate on which a plurality of light-emitting elements are mounted is attached. The cover is attached to the frame and covers the light-emitting substrate. The mounting portion is provided on an end plate portion and is attached to the side plate of the fixture body using screws or the like. Thereby, the light source unit is attached to the fixture body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the above conventional example has a problem that it is necessary to screw the mounting portion to the side plate of the fixture body while holding the light source unit by hand, which requires laborious work for the construction work.

[0005] An object of the present disclosure is to provide a lighting fixture and a construction method thereof that can facilitate the construction work.

Means for Solving the Problems

[0006] A lighting fixture according to one aspect of the present disclosure comprises a light source unit, a fixture body for holding the light source unit, and one or more mounting members for attaching the light source unit to the fixture body. The fixture body has a plurality of top plates arranged to surround an opening. The mounting member has a plurality of mounting portions that are placed on the plurality of top plates through the opening.

[0007] A method for installing a lighting fixture according to one aspect of the present disclosure includes the steps of: moving the light source unit to one of the plurality of top plates so as to be close to one of the top plates, and inserting the plurality of mounting parts into the opening of the fixture body; sliding the light source unit away from the one top plate; and placing the plurality of mounting parts one by one on the plurality of top plates. [Effects of the Invention]

[0008] The lighting fixture and installation method described herein have the effect of simplifying installation work. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view of a lighting fixture according to the embodiment of this disclosure, installed on a system ceiling. [Figure 2] Figure 2 is an exploded perspective view of the same lighting fixture. [Figure 3] Figure 3 is a bottom view of the same lighting fixture with the panel omitted. [Figure 4] Figure 4 is a top view of the same lighting fixture. [Figure 5] Figure 5 is a side view of the same lighting fixture as seen from the short side. [Figure 6] Figure 6 is a side view of the same lighting fixture as seen from the longitudinal direction. [Figure 7] Figure 7 is a cross-sectional view of the same lighting fixture, taken from the longitudinal direction. [Figure 8]Figure 8 is a bottom view of the power supply block in the lighting fixture described above. [Figure 9] Figure 9 is a side view of the power supply block in the lighting fixture described above, as seen from the short side direction. [Figure 10] Figure 10 is a side view of the power supply block in the lighting fixture described above, as seen from the long side direction. [Figure 11] Figure 11 is a perspective view of the lighting fixture described above during construction. [Figure 12] Figure 12 is a perspective view of the lighting fixture described above during construction. [Figure 13] Figure 13 is a perspective view of the lighting fixture described above after construction completion. [Figure 14] Figure 14 is an exploded perspective view of the lighting fixture of Modified Example 1. [Figure 15] Figure 15 is a perspective view of the lighting fixture of Modified Example 2. [Figure 16] Figure 16 is an exploded perspective view of the lighting fixture of Modified Example 2. [Figure 17] Figure 17 is an exploded perspective view of the lighting fixture of Modified Example 3. [Figure 18] Figure 18 is a bottom view of the lighting fixture of Modified Example 3. [Figure 19] Figure 19 is a top view of the lighting fixture of Modified Example 3. [Figure 20] Figure 20 is a side view of the lighting fixture of Modified Example 3. [Figure 21] Figure 21 is a side view of the lighting fixture of Modified Example 3 with the fourth side plate omitted. [Figure 22] Figure 22 is a perspective view of the lighting fixture of Modified Example 3 during construction. [Figure 23] Figure 23 is a perspective view of the lighting fixture of Modified Example 3 during construction. [Figure 24] Figure 24 is a perspective view of the lighting fixture of Modified Example 3 during construction. [Figure 25] Figure 25 is a perspective view of the lighting fixture of Modified Example 3 attached to a suspended ceiling system. [Figure 26] Figure 26 is a top view of the lighting fixture of Modified Example 3 attached to a suspended ceiling system. [Modes for carrying out the invention]

[0010] Hereinafter, lighting fixtures and their installation methods according to embodiments of this disclosure will be described in detail with reference to the drawings. However, the figures described in the following embodiments are schematic diagrams, and the ratios of the size and thickness of each component do not necessarily reflect the actual dimensional ratios. Furthermore, the configurations described in the following embodiments are merely examples of this disclosure. This disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of this disclosure can be achieved.

[0011] (1) Overview The lighting fixture B1 according to this embodiment comprises a light source unit A1, a fixture body 1 that holds the light source unit A1, and one or more mounting members 4 for attaching the light source unit A1 to the fixture body 1 (see Figure 2). The fixture body 1 is attached, for example, to a T-bar 9 that constitutes a system ceiling (see Figure 1). In other words, the fixture body 1 is installed so as to be embedded in the ceiling (system ceiling).

[0012] The main body of the appliance 1 has a plurality of top plates 10 arranged to surround the opening 100 (see Figures 2 and 4). The mounting member 4 has a plurality of mounting parts 41 that are placed on the plurality of top plates 10 through the opening 100.

[0013] The lighting fixture B1 according to the embodiment is installed in the following procedure. First, the lighting fixture B1 according to the embodiment is positioned so that the light source unit A1 is close to one of the multiple top plates 10, and the multiple mounting parts 41 are inserted into the opening 100 of the fixture body 1 (see Figure 11). Next, the lighting fixture B1 according to the embodiment is slid so that the light source unit A1 is away from the top plate 10 (see Figure 12). Finally, the lighting fixture B1 according to the embodiment is placed on each of the multiple top plates 10 one by one (see Figure 13).

[0014] In this embodiment, the lighting fixture B1 can be attached to the fixture body 1 by inserting the mounting member 4 into the opening 100 from below the fixture body 1, and then sliding the light source unit A1 to rest the multiple mounting portions 41 of the mounting member 4 on the multiple top plates 10. As a result, the lighting fixture B1 according to this embodiment can be made easier to install.

[0015] (2)Details The lighting fixture B1 according to this embodiment (hereinafter abbreviated as lighting fixture B1) is attached to a plurality of T-bars 9 that constitute the system ceiling (see Figure 1). The system ceiling is constructed by combining a plurality of T-bars 9 in a grid pattern. The plurality of T-bars 9 are joined to each suspension bolt by a plurality of T-hangers attached to each of the suspension bolts embedded in the ceiling slab of the building. As the plurality of T-bars 9 are combined in a grid pattern, a plurality of approximately square openings (hereinafter referred to as ceiling openings S1) are provided in a grid pattern, with the length of one side equal to the distance between adjacent T-bars 9 (see Figure 1).

[0016] The lighting fixture B1 is supported by multiple T-bars 9 and installed in one ceiling opening S1 (see Figure 1). Other equipment, such as air conditioning vents, is installed in the portion of the ceiling opening S1 where the lighting fixture B1 is installed, and in the ceiling opening S1 where the lighting fixture B1 is not installed. Furthermore, a square or rectangular flat ceiling panel is installed in the ceiling opening S1 where neither the lighting fixture B1 nor the equipment is installed.

[0017] The lighting fixture B1 comprises a light source unit A1, a fixture body 1 that holds the light source unit A1, and two mounting members 4 for attaching the light source unit A1 to the fixture body 1 (see Figure 2). However, the number of mounting members 4 is not limited to two; there may be one or three or more.

[0018] (2-1) Main body of the device The main body of the appliance 1 is formed in the shape of a long box with an open bottom. The main body of the appliance 1 has four side plates and two top plates 10 (see Figure 2). The four side plates and the two top plates 10 are all made of metal sheet material.

[0019] The four side plates include a first side plate 11 and a second side plate 12 that face each other along the short direction of the fixture body 1, and a third side plate 13 and a fourth side plate 14 that face each other along the long direction of the fixture body 1. The third side plate 13 connects one end of the long direction of the first side plate 11 and the second side plate 12. The fourth side plate 14 connects the other end of the long direction of the first side plate 11 and the second side plate 12. In other words, the fixture body 1 is formed in a rectangular frame shape by the four side plates.

[0020] The two top plates 10 are formed in a rectangular, flat shape. The longitudinal dimension of each top plate 10 is approximately the same as the longitudinal dimension of the first side plate 11 and the second side plate 12. Also, the short-side dimension of each top plate 10 is shorter than half the longitudinal dimension of the third side plate 13 and the fourth side plate 14 (see Figure 4). One top plate 10 protrudes from the upper end of the first side plate 11 toward the second side plate 12, and the other top plate 10 protrudes from the upper end of the second side plate 12 toward the first side plate 11. In other words, a rectangular opening 100 surrounded by the two top plates 10 is formed on the top (bottom) surface of the appliance body 1 (see Figures 2 and 4).

[0021] A window 17 is provided in the center of the longitudinal direction of the third side plate 13 (see Figure 2). The window 17 is formed in a rectangular shape with an open upper end by cutting out the third side plate 13.

[0022] A hook portion 15 is attached to each of the third side plate 13 and the fourth side plate 14 (see Figures 2 and 5). The hook portion 15 is formed in an inverted L shape. The hook portion 15 protrudes outward from the main body 1 of the device along the thickness direction of the third side plate 13 and the fourth side plate 14.

[0023] (2-2) Light source unit The light source unit A1 comprises a light source block 2 and a power supply block 3 (see Figure 2). The two mounting members 4 are fixed to the case 31 of the power supply block 3, as will be described later.

[0024] (2-2-1) Light source block The light source block 2 includes an LED module 20, a box 21, and a panel 22 (see Figures 2 and 3).

[0025] The LED module 20 comprises multiple LEDs 200, a rectangular substrate 201, and a connector 202 (see Figure 3). The multiple LEDs 200 are packaged white LEDs for illumination. The substrate 201 is formed in a long rectangular shape. Multiple LEDs 200 are mounted on the surface of the substrate 201 at equal intervals in a single row. Printed wiring for electrically connecting the multiple LEDs 200 is formed on the surface of the substrate 201. The connector 202 is mounted on one end of the substrate 201 in the longitudinal direction. The connector 202 is electrically connected to the multiple LEDs 200 via the printed wiring on the substrate 201.

[0026] The box body 21 is formed from metal plates into a rectangular box shape with an open bottom. The LED module 20 is attached to the bottom surface of the box body 21 (see Figures 3 and 7).

[0027] Panel 22 is formed in the shape of a rectangular flat plate from a translucent synthetic resin material such as acrylic resin or polycarbonate resin (see Figures 2 and 7). Panel 22 is attached to the box 21 so as to cover the opening on the bottom surface of the box 21 (see Figure 7). In other words, the illumination light emitted from the LED module 20 passes through panel 22 and is projected outside the box 21.

[0028] (2-2-2) Power Block The power supply block 3 includes a power supply unit 30, a case 31, a power terminal block 32, a signal terminal block 33, etc. (see Figure 8).

[0029] The power supply unit 30 is constructed by housing a printed circuit board 300 that forms the power supply circuit in a metal power supply case 301. The power supply circuit is configured to convert AC power supplied from an external power source (commercial power grid) via a power terminal block 32 into DC power, and to supply the converted DC power (DC current) to the LED module 20 via a connector 202. The power supply circuit is also configured to increase or decrease the DC current supplied to the LED module 20 in response to a dimming signal input from the outside via a signal terminal block 33.

[0030] The case 31 has a rectangular bottom wall 310, a pair of first side walls 311 projecting downwards in the thickness direction of the bottom wall 310 from both ends along the longitudinal direction of the bottom wall 310, and a second side wall 312 that closes one end of the bottom wall 310 and the pair of first side walls 311 in the longitudinal direction (see Figures 8 and 9). The bottom wall 310 and the pair of first side walls 311 are integrally formed from a metal plate. The power supply unit 30 is fixed to the inner bottom surface of the case 31 (the lower surface of the bottom wall 310) by screws (see Figure 8). The power terminal block 32 and the signal terminal block 33 are arranged at one end of the case 31 in the longitudinal direction (the open end) (see Figure 8). Each of the pair of first side walls 311 has a rectangular hole 313 at the upper end portion of both ends in the longitudinal direction (see Figure 9).

[0031] The case 31 of the power supply block 3 is screwed to the top surface of the box 21 of the light source block 2. In other words, the opening on the bottom of the case 31 is closed by the bottom plate of the box 21 (see Figure 7).

[0032] (2-2-3) Mounting components The two mounting members 4 have the same configuration. Each mounting member 4 has a fixing portion 40, a pair of resting portions 41, and a pair of bending portions 42 (see Figures 4 and 7). The fixing portion 40 is formed in a roughly U-shape when viewed from the longitudinal direction. The fixing portion 40 is provided with two screw insertion holes.

[0033] The pair of bent portions 42 are formed in an L-shape when viewed from the short side of the fixing portion 40 (see Figure 7). The pair of bent portions 42 protrude one from each end in the longitudinal direction of the fixing portion 40. The pair of mounting portions 41 are formed in the shape of a rectangular flat plate. The pair of mounting portions 41 protrude one from each end of the pair of bent portions 42. A screw hole 410 is provided at each end of the pair of mounting portions 41 (see Figure 2). The pair of bent portions 42 and the pair of mounting portions 41 are integrally formed by punching and bending a metal plate. However, the mounting member 4 is not limited to metal, and may be made of synthetic resin, for example.

[0034] The mounting member 4 is attached to the case 31 such that the fixing portion 40 is housed in the case 31 and the pair of resting portions 41 protrude outside the case 31. That is, the mounting member 4 is attached to the case 31 by screwing the fixing portion 40 to the bottom wall 310 of the case 31, with the longitudinal ends of the resting portion 41 and the fixing portion 40 protruding one by one from holes 313 provided in the pair of first side walls 311 of the case 31 (see Figures 4 and 8-10).

[0035] (2-2-4) Installation method of lighting fixtures Next, the installation method for lighting fixture B1 will be explained with reference to Figures 11-13. However, in Figures 11-13, the T-bar 9 to which the fixture body 1 is attached is not shown.

[0036] The worker performing the installation work (hereinafter referred to as "worker") moves the light source unit A1 to one side so that it is close to one of the top plates 10 (the right top plate 10 in Figure 11), and inserts each of the mounting portions 41 of the pair of mounting members 4 into the opening 100 of the fixture body 1 from below (see Figure 11). Here, the dimension D1, which is the sum of the width of the bottom wall 310 of the case 31 and the length from the case 31 to the tip of the mounting portion 41 protruding from the case 31, is shorter than the width dimension D2 of the opening 100 (see Figure 4). Therefore, the worker can insert one of the mounting portions 41 of the mounting member 4 into the opening 100 first, and then move the light source unit A1 to one side to insert the other mounting portion 41 of the mounting member 4 into the opening 100.

[0037] Next, the worker slides the light source unit A1 away from one of the top plates 10 (the right top plate 10 in Figure 12) (to the left in Figure 12). Then, the worker places the pair of mounting parts 41 onto the pair of top plates 10 one by one (see Figure 13). Note that in each mounting member 4, the length D3 between the tips of the pair of mounting parts 41 is sufficiently longer than the width dimension D2 of the opening 100 (see Figure 4). Furthermore, in each mounting member 4, the length D4 between the pair of bent parts 42 is slightly shorter than the width dimension D2 of the opening 100 (see Figure 4).

[0038] Therefore, the operator can position the light source unit A1 relative to the fixture body 1 by arranging a pair of bent portions 42 under a pair of top plates 10 in the opening 100 (see Figures 7 and 13). In other words, in this embodiment, the pair of bent portions 42 correspond to the positioning portions.

[0039] Next, the worker inserts one fixing screw 45 into each screw insertion hole 102 provided at both ends in the longitudinal direction of each top plate 10, and screws each fixing screw 45 into the screw hole 410 of the mounting portion 41 (see Figures 12 and 13). In other words, the worker fastens each pair of mounting portions 41 to the corresponding top plate 10 of the pair of top plates 10 using fixing screws 45 (fastening members), thereby fixing the light source unit A1 to the fixture body 1 (see Figure 13). When the light source unit A1 is fixed to the fixture body 1, the power terminal block 32 and signal terminal block 33 of the light source unit A1 are exposed to the outside of the fixture body 1 through the window 17 provided in the third side plate 13 (see Figure 6).

[0040] Finally, the worker electrically connects the power line to the power terminal block 32 from another ceiling opening S1 adjacent to the ceiling opening S1 where the lighting fixture B1 is installed, and electrically connects the signal line to the signal terminal block 33.

[0041] The installation of lighting fixture B1 is completed following the steps above.

[0042] (2-3) Advantages of the Embodiment However, as described above, the lighting fixture B1 can be attached to the fixture body 1 by inserting the mounting member 4 into the opening 100 from below the fixture body 1, and then sliding the light source unit A1 and placing the multiple mounting parts 41 of the mounting member 4 onto the multiple top plates 10. In other words, in the installation method of the lighting fixture B1, the worker can perform the installation work from below the ceiling opening S1 in which the lighting fixture B1 is to be installed. As a result, the lighting fixture B1 and its installation method make the installation work easier.

[0043] Furthermore, each of the pair of mounting parts 41 of the lighting fixture B1 is fastened to one of the pair of top plates 10 by fastening members (fixing screws 45) (see Figure 13). As a result, the lighting fixture B1 can firmly fix the light source unit A1 to the fixture body 1.

[0044] Furthermore, since the lighting fixture B1 has a pair of mounting parts 41 facing each other with a fixing part 40 in between, the light source unit A1 can be mounted to the fixture body 1 in a balanced manner.

[0045] Furthermore, since the lighting fixture B1 has a fixing part 40 and a pair of mounting parts 41 integrally formed from a rigid material (metal material), the light source unit A1 can be fixed even more firmly to the fixture body 1.

[0046] Here, with the light source unit A1 attached to the fixture body 1, the lighting fixture B1 houses the fixing portion 40 of the mounting member 4 within the opening 100 of the fixture body 1 (below the pair of top plates 10) (see Figure 7). In other words, since the lighting fixture B1 does not position a part of the mounting member 4 (fixing portion 40) above the top plates 10, the height (vertical direction) dimension can be reduced.

[0047] Furthermore, since the lighting fixture B1 has a positioning portion (bent portion 42) on the mounting member 4 that is positioned relative to a pair of top plates 10, the workability when attaching the light source unit A1 to the fixture body 1 can be improved.

[0048] Here, since the positioning portion (bent portion 42) of the lighting fixture B1 is formed integrally with the mounting portion 41, the number of parts can be reduced compared to when the positioning portion is formed separately from the mounting portion 41.

[0049] Furthermore, since the fixing portion 40 of the mounting member 4 of the lighting fixture B1 is fixed to the case 31 of the light source unit A1, space for fixing the fixing portion 40 can be easily secured.

[0050] Here, the lighting fixture B1 has a mounting member 4 attached to the case 31 such that the fixing part 40 is housed in the case 31 and the pair of mounting parts 41 protrude outside the case 31 (see Figure 7). As a result, the lighting fixture B1 can reduce the space occupied by the mounting member 4 and thus reduce the size of the light source unit A1.

[0051] Furthermore, since the lighting fixture B1 has one or more hooking parts 15 on the fixture body 1 that can be hooked onto the T-bar 9 that constitutes the system ceiling, the fixture body 1 can be easily attached to the T-bar 9.

[0052] (2-4) Modified examples of lighting fixtures according to the embodiment Next, several modifications of the lighting fixture B1 according to the embodiment will be described with reference to the drawings. However, the basic configuration of the lighting fixture B1 of each modification described below is the same as the basic configuration of the lighting fixture B1 according to the embodiment. Therefore, components that are common to or substantially common with the basic configuration of the lighting fixture B1 according to the embodiment will be denoted by the same reference numerals, and their illustration and description will be omitted as appropriate. In the following description, "substantially common components" means components that differ slightly in shape, size, etc., but have the same function.

[0053] (2-4-1) Variation 1 The lighting fixture B1 of the modified example 1 is characterized in that the positioning portion of the mounting member 4 is formed separately from the fixing portion 40 and the mounting portion 41.

[0054] In Modification 1, the positioning part consists of two dowels 101 provided on each of the pair of top plates 10 (see Figure 14). These four dowels 101 are formed into a cylindrical or truncated cone shape by drawing each top plate 10. However, the positioning part in Modification 1 may also be screws and rivets attached to the top plate 10.

[0055] These four dowels 101 are inserted one by one into the through holes 411 provided in each of the pair of mounting portions 41 of the two mounting members 4. In other words, in the lighting fixture B1 of the modified example 1, the mounting members 4 can be positioned relative to the fixture body 1 by inserting the positioning parts (dowels 101) into the through holes 411 provided in the mounting portions 41.

[0056] However, in the modified example 1, the lighting fixture B1 has the positioning part (dowel 101) of the mounting member 4 formed separately from the fixing part 40 and the resting part 41, thus increasing the degree of freedom in where the positioning part is installed.

[0057] (2-4-2) Modification example 2 The lighting fixture B1 in the modified example 2 is characterized by having only one mounting member 4.

[0058] In Modification 2, the light source unit A1 omits the mounting member 4 closer to the power terminal block 32 and signal terminal block 33, which is one of the two mounting members 4 provided in the light source unit A1 of the embodiment (see Figures 15 and 16). In Modification 2, the light source unit A1 has a pair of mounting parts 316 on the case 31 of the power block 3 instead of the omitted mounting member 4.

[0059] The pair of mounting portions 316 protrude outward from one end of the case 31 in the longitudinal direction (the end on which the power terminal block 32 and signal terminal block 33 are located) (see Figure 16). Each of the pair of mounting portions 316 is formed in the shape of a rectangular flat plate and has one screw hole 317 in the center.

[0060] In modified example 2, the device body 1 has a pair of screw insertion holes 130 (see Figure 16). The pair of screw insertion holes 130 are provided in the third side plate 13 of the device body 1 at positions that correspond one-to-one with the screw holes 317 of the pair of mounting portions 316.

[0061] Furthermore, in the modified example 2, the fixture body 1 has a plurality of positioning parts 16 (four in the illustrated example) for positioning the light source unit A1 in the short direction of the fixture body 1 (see Figure 16). The plurality of positioning parts 16 are provided in pairs on the third side plate 13 and the fourth side plate 14 of the fixture body 1. Each positioning part 16 is formed integrally with the third side plate 13 and the fourth side plate 14 by cutting and bending a portion of the third side plate 13 and the fourth side plate 14.

[0062] Next, we will briefly explain the installation procedure for lighting fixture B1 in modified example 2.

[0063] The worker performing the installation work (hereinafter referred to as "worker") moves the light source unit A1 to one side so that it is close to one of the top plates 10 (the right top plate 10 in Figure 16), and inserts the mounting portion 41 of one of the mounting members 4 (the right side in Figure 16) into the opening 100 of the fixture body 1 from below.

[0064] Next, the worker slides the light source unit A1 away from one of the top plates 10 (the right top plate 10 in Figure 16) (to the left in Figure 16). Then, the worker places the pair of mounting parts 41 onto the pair of top plates 10 one by one (see Figure 15).

[0065] Here, the casing 21 of the light source block 2 in the light source unit A1 is positioned between each pair of positioning parts 16 provided on the third side plate 13 and the fourth side plate 14 of the fixture body 1. Therefore, the operator can position the light source unit A1 on the fixture body 1 using the multiple positioning parts 16 provided on the fixture body 1.

[0066] Next, the worker screws each mounting portion 41 of one of the mounting members 4 to the corresponding top plate 10 of the pair of top plates 10.

[0067] Next, the worker inserts one mounting screw 18 into each of the two screw insertion holes 130 in the third side plate 13 of the fixture body 1 through another ceiling opening S1 adjacent to the ceiling opening S1 in which the lighting fixture B1 is installed, and then screws each mounting screw 18 into each of the two screw holes 317 in the case 31 to fix the light source unit A1 to the fixture body 1 (see Figure 15). When the light source unit A1 is fixed to the fixture body 1, the power terminal block 32 and signal terminal block 33 of the light source unit A1 are exposed to the outside of the fixture body 1 through the window 17 provided in the third side plate 13 (see Figure 15). Finally, the worker electrically connects the power line to the power terminal block 32 and the signal line to the signal terminal block 33.

[0068] The installation of lighting fixture B1 in modified example 2 is completed by following the above procedure.

[0069] However, the lighting fixture B1 of the modified example 2, like the lighting fixture B1 of the embodiment, can be made easier to install.

[0070] (2-4-3) Modification 3 The lighting fixture B1 of Modification 3 is characterized in that, like the lighting fixture B1 of Modification 2, it has only one mounting member 4 (see Figures 17 and 19). In Modification 3, the mounting member 4 is located near the first end of the light source unit A1. The first end of the light source unit A1 is the end opposite to the end (second end) where the power terminal block 32 and signal terminal block 33 are located, in the longitudinal direction of the light source unit A1.

[0071] The mounting member 4 in modified example 3 (hereinafter abbreviated as mounting member 4) has a different structure from the mounting member 4 in the embodiment and modified examples 1-2 (see Figures 19-21). Specifically, the mounting member 4 does not have a step (bend 42) between the fixing part 40 and the pair of resting parts 41, and the fixing part 40 and the pair of resting parts 41 are formed as a flat strip without any steps. In addition, the mounting member 4 is formed integrally with the second side wall 312 of the case 31 of the power supply block 3 (see Figures 19 and 21). However, the mounting member 4 has a rectangular flat positioning part 46 at the boundary with the second side wall 312 (see Figure 21). The longitudinal dimension of the positioning part 46 is slightly shorter than the width dimension D2 of the opening 100 of the fixture body 1.

[0072] Furthermore, the mounting member 4 has a locking portion 47 that engages with the top plate 10 (see Figures 17 and 19). The locking portion 47 is integrally formed with one of the pair of mounting portions 41, which is wider. The locking portion 47 is L-shaped and protrudes downward from the edge of the mounting portion 41. Here, each of the pair of top plates 10 has an integral reinforcing piece 103 that protrudes downward from the edge facing the opening 100. The locking portion 47 is then engaged with the reinforcing piece 103 provided on one of the top plates 10 (see Figure 21).

[0073] Next, the installation method of lighting fixture B1 in modified example 3 will be explained with reference to Figures 22-24. However, in Figures 22-24, the T-bar to which the fixture body 1 in modified example 3 is attached is omitted.

[0074] The worker performing the installation work (hereinafter referred to as "worker") moves the light source unit A1 to one side so that it is close to one of the top plates 10 (the right top plate 10 in Figure 22), and inserts the pair of mounting parts 41 of the mounting member 4 into the opening 100 of the fixture body 1 from below (see Figure 22). Here, the worker first inserts one of the mounting parts 41 of the mounting member 4 (the mounting part 41 without the locking part 47) into the opening 100, and then moves the light source unit A1 to one side so that the other mounting part 41 of the mounting member 4 (the mounting part 41 with the locking part 47) can be inserted into the opening 100 (see Figure 22).

[0075] Next, the worker slides the light source unit A1 away from one of the top plates 10 (the right top plate 10 in Figure 22) (to the left in Figure 22). Then, the worker places the pair of mounting parts 41 onto the pair of top plates 10 one by one (see Figure 23). In the mounting member 4, the length between the tips of the pair of mounting parts 41 is sufficiently longer than the width dimension D2 of the opening 100, and the length of the positioning part 46 is slightly shorter than the width dimension D2 of the opening 100.

[0076] Therefore, the operator can position the light source unit A1 relative to the fixture body 1 by placing the positioning unit 46 between the pair of top plates 10 in the opening 100 (see Figures 21 and 23).

[0077] Next, the worker supports the light source unit A1 from below and connects the light source unit A1 to the fixture body 1 by screwing the pair of mounting parts 316 of the case 31 to the third side plate 13 with two mounting screws 18 (see Figure 24).

[0078] Finally, the worker electrically connects the power line to the power terminal block 32 from another ceiling opening S1 adjacent to the ceiling opening S1 where the lighting fixture B1 is installed, and electrically connects the signal line to the signal terminal block 33.

[0079] The installation of lighting fixture B1 in modified example 3 is completed by following the above procedure.

[0080] In the lighting fixture B1 of the embodiment and modified example 1, it is not easy to distinguish between the state in which each pair of mounting parts 41 of the two mounting members 4 are placed on the pair of top plates 10 (a state during construction) and the state in which each pair of mounting parts 41 of the two mounting members 4 are fixed to the corresponding top plate 10 of the pair of top plates 10 with fixing screws 45 (a state after construction is complete). Therefore, in the lighting fixture B1 of the embodiment and modified example 1, there is a possibility that the worker may forget to fix the two mounting members 4 to the top plate 10 with fixing screws 45 while the lighting fixture B1 is in the state during construction.

[0081] In contrast, the lighting fixture B1 of Modified Example 3 has the mounting member 4 positioned only near the first end of the light source unit A1. Therefore, in the lighting fixture B1 of Modified Example 3, when the pair of mounting parts 41 of the mounting member 4 are placed on the pair of top plates 10 (in the process of construction), the pair of mounting parts 41 act as a pivot point, allowing the light source unit A1 to rotate under its own weight, causing the second end of the light source unit A1 to protrude below the second side wall 312 of the fixture body 1 (see Figure 23). The light source unit A1 then comes to rest at a position (angle) where the box body 21 touches the fourth side plate 14 of the fixture body 1.

[0082] Therefore, in Modification 3, the lighting fixture B1 allows workers to easily distinguish between the in-progress and completed states of installation based on whether or not the second end of the light source unit A1 protrudes from the fixture body 1. As a result, the lighting fixture B1 of Modification 3 can be prevented from being left in an in-progress state. In addition, in the lighting fixture B1 of Modification 2, the light source unit A1 can be rotated by its own weight using the pair of mounting parts 41 as a fulcrum, causing the second end of the light source unit A1 to protrude below the second side wall 312 of the fixture body 1. As a result, the lighting fixture B1 of Modification 2 can be prevented from being left in an in-progress state, similar to the lighting fixture B1 of Modification 3.

[0083] Incidentally, in buildings where a system ceiling is installed, partitions are sometimes provided to divide the floor into multiple sections. Such partitions are usually attached to the T-bar 9. Furthermore, system ceilings that use partitions are reinforced with braces to ensure seismic safety. In system ceilings that are reinforced with braces, additional reinforcing members 8 are used (see Figures 25 and 26).

[0084] The reinforcing member 8 is composed of, for example, a lower mounting bracket 80, a lower reinforcing bracket 81, and a compression reinforcing member 82. The lower mounting bracket 80 is attached to the horizontal T-bar 9 at the point where the vertical T-bar 9 and the horizontal T-bar 9 intersect (hereinafter referred to as the intersection point), for example, to the horizontal T-bar 9. The compression reinforcing member 82 is formed in a trough shape and is positioned to surround the suspension bolt and T-hanger 90 (see Figure 26). The upper end of the compression reinforcing member 82 is fixed to the ceiling slab, and the lower end of the compression reinforcing member 82 is fixed to the lower mounting bracket 80. The lower reinforcing bracket 81 is attached to the compression reinforcing member 82 and the lower mounting bracket 80 to reinforce the compression reinforcing member 82 and the lower mounting bracket 80. The lower mounting bracket 80 is formed in a rectangular plate shape, and the end of the brace material for brace reinforcement is attached to it.

[0085] Here, the lighting fixture B1 in the embodiment and modified example 1-3 may be installed in the center of the ceiling opening S1 (see Figure 1) or at the edge of the ceiling opening S1 (see Figure 25).

[0086] In the embodiment and modified example 1-2, the lighting fixture B1 has a pair of hooks 15 that can be hooked onto the T-bar 9, positioned diagonally across the rectangular opening 100 (see Figure 4). As a result, in the lighting fixture B1 of the embodiment and modified example 1-2, the hooks 15 may come into contact with the lower mounting bracket 80 of the reinforcing member 8, making it impossible to move the fixture body 1 to the edge of the ceiling opening S1. Moreover, in the lighting fixture B1 of the embodiment and modified example 1-2, since the pair of hooks 15 are positioned diagonally across the opening 100 on the fixture body 1, the positional relationship between the hooks 15 and the lower mounting bracket 80 does not change even if the fixture body 1 is rotated 180 degrees, making it impossible to move the fixture body 1 to the edge of the ceiling opening S1.

[0087] In contrast, as shown in Figure 19, the lighting fixture B1 of Modified Example 3 has a pair of hooks 15 positioned at both ends of one of the long sides of the opening 100 in the fixture body 1. Therefore, the position of the pair of hooks 15 can be changed by rotating the fixture body 1 180 degrees (see Figures 19 and 26). As a result, the lighting fixture B1 of Modified Example 3 can be installed with the fixture body 1 close to the end of the ceiling opening S1 where the reinforcing member 8 is located (see Figures 25 and 26), thereby improving the workability of the installation process.

[0088] (3) Summary A lighting fixture (B1) according to a first aspect of the present disclosure comprises a light source unit (A1), a fixture body (1) that holds the light source unit (A1), and one or more mounting members (4) for attaching the light source unit (A1) to the fixture body (1). The fixture body (1) has a plurality of top plates (10) arranged to surround an opening (100). The mounting members (4) have a plurality of mounting parts (41) that are placed on the plurality of top plates (10) through the opening (100).

[0089] In the first embodiment of the lighting fixture (B1), the light source unit (A1) can be attached to the fixture body (1) by inserting the mounting member (4) into the opening (100) from below the fixture body (1), and then sliding the light source unit (A1) to rest the multiple mounting parts (41) of the mounting member (4) on the multiple top plates (10). As a result, the lighting fixture (B1) in the first embodiment can be made easier to install.

[0090] A lighting fixture (B1) according to a second aspect of this disclosure can be realized by combining it with the first aspect. The lighting fixture (B1) according to the second aspect preferably comprises two mounting members (4). The two mounting members (4) are preferably provided one at each end of the light source unit (A1).

[0091] In the second embodiment of the lighting fixture (B1), the light source unit (A1) can be stably attached to the fixture body (1) by placing two mounting members (4) on multiple top plates (10), thereby further simplifying the installation work.

[0092] A lighting fixture (B1) according to a third aspect of this disclosure can be realized by combining it with the first aspect. The lighting fixture (B1) according to the third aspect preferably comprises a mounting member (4) provided near the first end of the light source unit (A1) and a fixed part (mounting part 316) provided near the second end of the light source unit (A1). The fixture body (1) preferably further comprises a plurality of side plates (first side plate 11, second side plate 12, third side plate 13, fourth side plate 14) that form an opening (100). The fixed part is preferably fixed to one or more of the plurality of side plates (third side plate 13).

[0093] In the third embodiment of the lighting fixture (B1), the light source unit (A1) can be temporarily fixed to the fixture body (1) in an inclined state relative to the fixture body (1) by placing the mounting portion (41) of one mounting member (4) on multiple top plates (10). Then, in the third embodiment of the lighting fixture (B1), the light source unit (A1) can be securely attached to the fixture body (1) by fixing the fixed portion of the light source unit (A1) to the side plate of the fixture body (1). As a result, in the lighting fixture (B1) of the third embodiment, since the light source unit (A1) is inclined relative to the fixture body (1) in a temporarily fixed state, the work of fixing the fixed portion to the side plate can be reliably performed.

[0094] A lighting fixture (B1) according to a fourth aspect of this disclosure can be realized by combining it with any of the first to third aspects. In the lighting fixture (B1) according to the fourth aspect, it is preferable that each of the multiple mounting parts (41) is fastened to a corresponding top plate (10) from among the multiple top plates (10) by fastening members (fixing screws 45).

[0095] The lighting fixture (B1) according to the fourth embodiment allows the light source unit (A1) to be firmly fixed to the fixture body (1).

[0096] A lighting fixture (B1) according to a fifth aspect of this disclosure can be realized in combination with any of the first to fourth aspects. In the lighting fixture (B1) according to the fifth aspect, the mounting member (4) preferably further has a fixing portion (40) that is fixed to the light source unit (A1).

[0097] The lighting fixture (B1) according to the fifth embodiment allows the mounting member (4) to be securely fixed to the light source unit (A1).

[0098] A lighting fixture (B1) according to a sixth aspect of this disclosure can be realized by combining it with a fifth aspect. In the lighting fixture (B1) according to the sixth aspect, it is preferable that the multiple mounting parts (41) face each other with a fixing part (40) in between.

[0099] The lighting fixture (B1) according to the sixth embodiment allows the light source unit (A1) to be mounted to the fixture body (1) in a balanced manner.

[0100] A lighting fixture (B1) according to the seventh aspect of this disclosure can be realized by combining it with the sixth aspect. In the lighting fixture (B1) according to the seventh aspect, it is preferable that the fixing part (40) and the plurality of mounting parts (41) are integrally formed from a rigid material.

[0101] The lighting fixture (B1) according to the seventh embodiment allows the light source unit (A1) to be fixed more firmly to the fixture body (1).

[0102] A lighting fixture (B1) according to the eighth aspect of this disclosure can be realized by combining it with the seventh aspect. In the lighting fixture (B1) according to the eighth aspect, the fixing part (40) is preferably housed within the opening (100).

[0103] In the lighting fixture (B1) according to the eighth embodiment, a part of the mounting member (4) (fixing part 40) is not positioned above the top plate (10), so the height (vertical direction) dimension can be reduced.

[0104] A lighting fixture (B1) according to the ninth aspect of this disclosure can be realized in combination with any of the first to eighth aspects. In the lighting fixture (B1) according to the ninth aspect, the mounting member (4) preferably further has a positioning portion (bent portion 42; dowel 101) that is positioned relative to a plurality of top plates (10).

[0105] The lighting fixture (B1) according to the ninth embodiment can improve workability when attaching the light source unit (A1) to the fixture body (1).

[0106] A lighting fixture (B1) according to the tenth aspect of this disclosure can be realized by combining it with the ninth aspect. In the lighting fixture (B1) according to the tenth aspect, it is preferable that the positioning portion (bending portion 42) is formed integrally with the mounting portion (41).

[0107] The lighting fixture (B1) according to the tenth embodiment can reduce the number of parts compared to the case in which the positioning part is formed separately from the mounting part (41).

[0108] A lighting fixture (B1) according to the eleventh aspect of this disclosure can be realized by combining it with the ninth aspect. In the lighting fixture (B1) according to the eleventh aspect, it is preferable that the positioning portion (dowel 101) is formed separately from the mounting portion (41).

[0109] The lighting fixture (B1) according to the 11th embodiment allows for greater flexibility in the location of the positioning part.

[0110] A lighting fixture (B1) according to the twelfth aspect of this disclosure can be realized in combination with the fifth aspect. In the lighting fixture (B1) according to the twelfth aspect, the light source unit (A1) preferably includes a light source (LED module 20), a power supply device (30) for lighting the light source, and a case (31) for housing the power supply device (30). The fixing part (40) is preferably fixed to the case (31).

[0111] The lighting fixture (B1) according to the 12th embodiment allows for easy securing of space for fixing the fixing part (40).

[0112] A lighting fixture (B1) according to the thirteenth aspect of this disclosure can be realized by combining it with the twelfth aspect. In the lighting fixture (B1) according to the thirteenth aspect, the mounting member (4) is preferably attached to the case (31) such that the fixing portion (40) is housed in the case (31) and the plurality of mounting portions (41) protrude outside the case (31).

[0113] The lighting fixture (B1) according to the 13th embodiment allows for miniaturization of the light source unit (A1) by reducing the space occupied by the mounting member (4).

[0114] A lighting fixture (B1) according to the 14th aspect of this disclosure can be realized in combination with any of the 1st to 13th aspects. In the lighting fixture (B1) according to the 14th aspect, the fixture body (1) preferably further has one or more hooks (15) that can be hooked onto a T-bar (9) constituting a system ceiling.

[0115] The lighting fixture (B1) according to the 14th embodiment allows the fixture body (1) to be easily attached to the T-bar (9).

[0116] The installation method for a lighting fixture (B1) according to the 15th aspect of this disclosure is the installation method for a lighting fixture (B1) according to any of the 1st to 14th aspects. The installation method according to the 15th aspect includes the steps of: moving the light source unit (A1) to one side so as to be close to one of the multiple top plates (10), and inserting the multiple mounting parts (41) into the opening (100) of the fixture body (1); sliding the light source unit (A1) away from the one top plate (10); and placing the multiple mounting parts (41) one by one on the multiple top plates (10).

[0117] The installation method for the lighting fixture (B1) according to the 15th embodiment involves inserting the mounting member (4) into the opening (100) from below the fixture body (1), and then sliding the light source unit (A1) to rest the multiple mounting parts (41) of the mounting member (4) on the multiple top plates (10) to attach the light source unit (A1) to the fixture body (1). As a result, the installation method for the lighting fixture (B1) according to the 12th embodiment can simplify the installation work.

[0118] The installation method for the lighting fixture (B1) according to the 16th aspect of this disclosure is the installation method for the lighting fixture (B1) according to the third aspect. The installation method according to the 16th aspect includes the steps of: moving the light source unit (A1) to one side so as to be close to one of the multiple top plates (10), and inserting the multiple mounting parts (41) into the opening (100) of the fixture body (1); sliding the light source unit (A1) away from the one top plate (10); placing the multiple mounting parts (41) one by one on the multiple top plates (10); and fixing the fixed part (mounting part 316) to one or more side plates (third side plate 13).

[0119] The installation method for the lighting fixture (B1) according to the 16th embodiment allows the light source unit (A1) to be temporarily fixed to the fixture body (1) in an inclined state relative to the fixture body (1) by placing the mounting portion (41) of one mounting member (4) on multiple top plates (10). Furthermore, the installation method for the lighting fixture (B1) according to the 16th embodiment allows the light source unit (A1) to be securely attached to the fixture body (1) by fixing the fixed portion of the light source unit (A1) to the side plate of the fixture body (1). As a result, since the installation method for the lighting fixture (B1) according to the 16th embodiment tilts the light source unit (A1) relative to the fixture body (1) in a temporarily fixed state, the work of fixing the fixed portion to the side plate can be reliably performed. [Explanation of symbols]

[0120] A1 Light source unit B1 Lighting fixtures 1. Main body of the device 4. Mounting components 9 T-bar 10 Top plate 13 Third side plate (side plate) 15 Hook part 20 LED modules (light sources) 30 Power supply 31 cases 40 Fixed part 41 Mounting section 42 Bending section (positioning section) 45 Fixing screws (fastening components) 100 opening 101 Dowel (positioning part) 316 Mounting part (part to be fixed)

Claims

1. Light source unit, The fixture body that holds the light source unit, One or more mounting members for attaching the light source unit to the fixture body, Equipped with, The main body of the device has multiple top plates arranged to surround the opening, The mounting member has a plurality of mounting portions that are placed on the plurality of top plates through the opening, Lighting fixtures.

2. The mounting members are provided as follows: The two mounting members are provided one at each end of the light source unit. The lighting fixture according to claim 1.

3. One of the mounting members provided near the first end of the light source unit, A fixed portion provided near the second end of the light source unit, Equipped with, The device body further comprises a plurality of side plates that form the opening, The fixed portion is fixed to one or more of the multiple side plates. The lighting fixture according to claim 1.

4. Each of the aforementioned multiple mounting portions is fastened to a corresponding top plate among the aforementioned multiple top plates by a fastening member. A lighting fixture according to any one of claims 1 to 3.

5. The mounting member further has a fixing portion that is fixed to the light source unit. A lighting fixture according to any one of claims 1 to 3.

6. The aforementioned plurality of mounting portions are opposite each other with the fixing portion in between. The lighting fixture according to claim 5.

7. The fixing portion and the plurality of mounting portions are integrally formed from a rigid material. The lighting fixture according to claim 6.

8. The fixing part is housed within the opening. The lighting fixture according to claim 7.

9. The mounting member further has a positioning portion that is positioned relative to the plurality of top plates. A lighting fixture according to any one of claims 1 to 3.

10. The positioning portion is formed integrally with the mounting portion. The lighting fixture according to claim 9.

11. The positioning portion is formed separately from the mounting portion. The lighting fixture according to claim 9.

12. The light source unit comprises a light source, a power supply device for illuminating the light source, and a case for housing the power supply device. The aforementioned fixing part is fixed to the case. The lighting fixture according to claim 5.

13. The mounting member is attached to the case such that the fixing portion is housed in the case and the plurality of mounting portions protrude outside the case. The lighting fixture according to claim 12.

14. The fixture body further has one or more hooking parts that can be hooked onto the T-bars that make up the system ceiling. A lighting fixture according to any one of claims 1 to 3.

15. A method for installing a lighting fixture according to any one of claims 1 to 3, The steps include: moving the light source unit to one side so as to be close to one of the multiple top plates, and inserting the multiple mounting parts into the openings of the fixture body; A step of sliding the light source unit away from the top plate, The process of placing the plurality of mounting parts one by one onto the plurality of top plates, including, Installation methods for lighting fixtures.

16. A method for installing a lighting fixture according to claim 3, The steps include: moving the light source unit to one side so as to be close to one of the multiple top plates, and inserting the multiple mounting parts into the openings of the fixture body; A step of sliding the light source unit away from the top plate, The process of placing the plurality of mounting parts one by one onto the plurality of top plates, The steps include fixing the part to be fixed to one or more side plates, including, Installation methods for lighting fixtures.

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