Lighting fixtures

Abstract

This invention proposes a lighting fixture that can be attached to a mounting surface and that can suppress the increase in size of the lighting fixture compared to conventional fixtures. [Solution] The lighting fixture comprises an arm having a base that is attached to the mounting part and a mounting part that extends from the base in a first direction, a light source holder that holds a light source, and a bolt that is screwed into the light source holder and attaches the light source holder to the arm. The mounting part is formed such that a bolt insertion part into which the bolt is inserted penetrates the mounting part and extends in a second direction that is inclined with respect to the first direction, and the light source holder is movable in the second direction with the bolt inserted into the bolt insertion part and is rotatable about the bolt as the center of rotation.

Description

Technical Field

[0005]

[0001] The present disclosure relates to a lighting fixture arranged on a ceiling or the like.

Background Art

[0002] Conventionally, lighting fixtures arranged at high places such as ceilings have been known (for example, see Patent Document 1). Such lighting fixtures are attached to an attachment portion such as an exposed box. Further, such a lighting fixture includes an attachment member attached to the attachment portion and a light source holding portion attached to the attachment member and holding a light source. Further, in such a lighting fixture, an attachment hole, which is a through hole, is formed in the attachment member attached to the attachment portion. Then, the lighting fixture is attached to the attachment portion by screwing a bolt inserted into the attachment hole into a female screw formed in the attachment portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0006] The lighting fixture according to this disclosure comprises an arm having a base attached to a mounting portion and a mounting portion extending from the base in a first direction, a light source holding portion for holding a light source, and a bolt screwed into the light source holding portion for attaching the light source holding portion to the arm, wherein the mounting portion has a bolt insertion portion into which the bolt is inserted, which penetrates the mounting portion and extends in a second direction inclined with respect to the first direction, and the light source holding portion is movable in the second direction with the bolt inserted into the bolt insertion portion and is rotatable about the bolt as the center of rotation. [Effects of the Invention]

[0007] In the lighting fixture according to this disclosure, by loosening the bolt that attaches the light source holder to the arm, the light source holder is movable in a second direction and rotatable about the bolt as the center of rotation. Therefore, in the lighting fixture according to this disclosure, when attaching the lighting fixture to a mounting surface, the position of the light source holder can be moved from the position in which the lighting fixture is used. As a result, in the lighting fixture according to this disclosure, when attaching the lighting fixture to a mounting surface, the light source holder can be positioned in a location that is less likely to interfere with tools. Consequently, the lighting fixture according to this disclosure can be made larger than conventional lighting fixtures that are attached to a mounting surface. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of the lighting fixture according to this first embodiment. [Figure 2] This is a side view of the lighting fixture according to this embodiment 1. [Figure 3] This is an exploded perspective view of the lighting fixture according to this embodiment 1. [Figure 4] This is a perspective view showing the arm of the lighting fixture according to this embodiment 1. [Figure 5] This is a plan view showing the arm of the lighting fixture according to this first embodiment. [Figure 6] This is a side view of the arm of the lighting fixture according to this embodiment 1, observed in the lateral direction X. [Figure 7] This is a side view of the arm of the lighting fixture according to this embodiment 1, observed in the lateral direction Y. [Figure 8] This is a view from arrow A in Figure 6. [Figure 9] This is a side view of the lighting fixture according to this embodiment 1, observed in the lateral direction Y, and is a diagram for explaining the method of installing the lighting fixture. [Figure 10] This is a side view of the lighting fixture according to this embodiment 1, observed in the lateral direction Y, and is a diagram for explaining the method of installing the lighting fixture. [Figure 11] This is a side view of the lighting fixture according to this embodiment 1, observed in the lateral direction Y, and is a diagram for explaining the method of installing the lighting fixture. [Figure 12] This is a side view of the lighting fixture according to this second embodiment, observed in the lateral direction Y. [Figure 13] This is a side view of the lighting fixture according to this second embodiment, observed in the lateral direction Y, and is a diagram for explaining the method of installing the lighting fixture. [Figure 14] This is a side view of the lighting fixture according to this second embodiment, observed in the lateral direction Y, and is a diagram for explaining the method of installing the lighting fixture. [Figure 15] This is a side view of the lighting fixture according to this second embodiment, observed in the lateral direction Y, and is a diagram for explaining the method of installing the lighting fixture. [Modes for carrying out the invention]

[0009] An example of a lighting fixture according to the present disclosure will be described in the following embodiments. In the following embodiments, an example of a lighting fixture according to the present disclosure will be described while observing an example of a lighting fixture according to the present disclosure in the position when it is attached to the lower surface of a mounting part such as an exposed box. In the following embodiments, the vertical direction will be referred to as the vertical direction Z. The horizontal direction perpendicular to the vertical direction Z will be referred to as the horizontal direction X. The horizontal direction perpendicular to both the vertical direction Z and the horizontal direction X will be referred to as the horizontal direction Y. These directions do not limit the lighting fixture according to the present disclosure.

[0010] Embodiment 1. Figure 1 is a perspective view of the lighting fixture according to this embodiment 1. Figure 2 is a side view of the lighting fixture according to this embodiment 1. Figure 3 is an exploded perspective view of the lighting fixture according to this embodiment 1. Figure 4 is a perspective view showing the arm of the lighting fixture according to this embodiment 1. Figure 5 is a plan view showing the arm of the lighting fixture according to this embodiment 1. Figure 6 is a side view of the arm of the lighting fixture according to this embodiment 1, observed in the lateral direction X. Figure 7 is a side view of the arm of the lighting fixture according to this embodiment 1, observed in the lateral direction Y. Figure 8 is a view taken along arrow A in Figure 6.

[0011] The lighting fixture 1 comprises an arm 100 that is attached to a mounting surface such as an exposed box, and a light source holder 210 attached to the arm 100. The arm 100 has a through-hole, which is a mounting hole 111, and the arm 100 is attached to the mounting surface using the mounting hole 111. The light source holder 210 holds the light source 230. The light source 230 does not have to be a component of the lighting fixture 1, but in this embodiment 1, the light source 230 is a component of the lighting fixture 1 and, together with the light source holder 210, constitutes a light source unit 200 as described later. The lighting fixture 1 also includes a bolt 10 for fixing the light source holder 210 to the arm 100. That is, the light source holder 210 is attached to the arm 100 by the bolt 10.

[0012] The arm 100 includes a base portion 110 and a mounting portion 120. The base portion 110 is a location to be attached to the attached portion, and is formed of, for example, a plate-like member. The normal line of the flat surface portion of the base portion 110 faces the vertical direction Z. The mounting portion 120 is a location to which the light source holding portion 210 is attached, and is formed of, for example, a plate-like member. The mounting portion 120 extends from the base portion 110 in the first direction. In the first embodiment, the vertical direction Z is the first direction. More specifically, the mounting portion 120 extends downward from the end portion in the lateral direction Y of the base portion 110. Also, in the first embodiment, the arm 100 includes a pair of mounting portions 120. That is, the pair of mounting portions 120 face each other in the lateral direction Y. And the arm 100 has a substantially U shape.

[0013] Also, the arm 100 according to the first embodiment includes a connecting portion 130 that connects the base portion 110 and the mounting portion 120. In the first embodiment, the connecting portion 130 has a curved surface. Thereby, stress concentration generated in the connecting portion 130 when the arm 100 vibrates or the like can be alleviated.

[0014] A mounting hole 111, which is a through hole, is formed in the base portion 110 of the arm 100. A bolt for attaching the base portion 110 to the attached portion is inserted into the mounting hole 111. Specifically, the base portion 110 is attached to the attached portion by screwing the bolt inserted into the mounting hole 111 into the female screw of the attached portion. In the first embodiment, four mounting holes 111 are formed in the base portion 110. Also, each mounting hole 111 has an elongated hole shape. Further, the elongated hole portions of the round-bottom holes 112 communicate with two of the four mounting holes 111. Thereby, when attaching the lighting fixture 1 to the attached portion, the head of the bolt screwed into the female screw of the attached portion is passed through the round hole portion of the round-bottom hole 112, and the bolt is inserted into the elongated hole portion of the round-bottom hole 112, whereby the lighting fixture 1 can be temporarily fixed to the attached portion.

[0015] In this embodiment 1, the base 110 of the arm 100 also has mounting holes 113 into which suspension bolts are inserted, so that the lighting fixture 1 can be attached to suspension bolts provided on the ceiling or the like. In this embodiment 1, two mounting holes 113 are formed in the base 110. In addition, a wiring hole 114 is formed in the base 110. The lead wires 214 of the light source holder 210 are inserted into the wiring holes 114. By connecting the power line connected to the power supply source to the lead wires 214, power is supplied from the power supply source to the light source holder 210 of the lighting fixture 1. In this embodiment 1, the wiring hole 114 is circular in shape. Therefore, by inserting the lead wires 214, which have a circular cross-section, into the wiring hole 114, the wiring hole 114 can be blocked by the lead wires 214. This prevents, for example, power lines and the like that located inside the exposed box from being exposed to the outside of the exposed box through the wiring hole 114 when the mounting part is an exposed box.

[0016] The mounting portion 120 of the arm 100 has a light source holder 210 attached to its lower part. The lower part of the mounting portion 120 has an elongated hole 122 that extends in a second direction inclined with respect to a first direction. The second direction inclined with respect to the first direction includes a direction perpendicular to the first direction. In this embodiment 1, the second direction is the lateral direction X that is perpendicular to the first direction, which is the vertical direction Z. Also in this embodiment 1, in order to make the elongated hole 122 long, the arm 100 has a protrusion 121 at its lower part that protrudes in the lateral direction X. The elongated hole 122 is where the bolt 10 for attaching the light source holder 210 to the mounting portion 120 is inserted. That is, the bolt 10 inserted into the mounting portion 120 is movable between the first end 122a, which is one end of the elongated hole 122, and the second end 122b, which is the other end of the elongated hole 122. In the following, of the four mounting holes 111 formed in the base 110, the two mounting holes 111 located on the first end 122a side may be referred to as mounting holes 111a. Also, in the following, of the four mounting holes 111 formed in the base 110, the two mounting holes 111 located on the second end 122b side may be referred to as mounting holes 111b.

[0017] Furthermore, the mounting portion 120 of the arm 100 has a recess 123 formed in the edge of the elongated hole 122, moving away from the base portion 110. This recess 123 is where the bolt 10 is inserted when fixing the light source holder 210 to the arm 100. In this embodiment 1, the recess 123 is formed at the second end 122b of the elongated hole 122. Specifically, the bolt 10 inserted into the elongated hole 122 is screwed into the female thread 222 of the light source holder 210, which will be described later. When attaching the arm 100 to the mounting portion, the bolt 10 is loosened and moved to the first end 122a of the elongated hole 122, thereby retracting the light source holder 210. After attaching the arm 100 to the mounting portion, the bolt 10 is moved towards the second end 122b of the elongated hole 122 and inserted into the recess 123. Then, by tightening the bolt 10, the mounting portion 120 is sandwiched between the head of the bolt 10 and the light source holder 210, and the light source holder 210 is fixed to the arm 100 in the position in which it is used. In this embodiment 1, the recess 123 is formed at an angle with respect to the direction perpendicular to the direction in which the elongated hole 122 extends, so that the bolt 10 can be easily inserted into the recess 123 from the elongated hole 122.

[0018] Furthermore, the mounting portion 120 of the arm 100 has multiple markings 124 that extend radially from the recess 123. When the bolt 10 is inserted into the recess 123, the light source holder 210 is rotatable around the bolt 10 as its pivot point before the bolt 10 is tightened. Therefore, the bolt 10 is tightened after adjusting the angle of the light source holder 210 relative to the arm 100 to the angle at which the lighting fixture 1 is used. At this time, by aligning the markings 223 and 124 formed on the light source holder 210, the angle of the light source holder 210 relative to the arm 100 can be visually confirmed, making it easy to adjust the angle of the light source holder 210 relative to the arm 100.

[0019] A daruma hole 131 is formed in the connection portion 130 of the arm 100. This daruma hole 131 consists of a round hole 132 and an elongated hole 133. The elongated hole 133 has a width smaller than the diameter of the round hole 132, and one end is in communication with the round hole 132. The elongated hole 133 extends from the round hole 132 toward the mounting portion 120. When attaching the lighting fixture 1 to the mounting portion, it is necessary to first connect the lead wires 214 and the power wires before attaching the lighting fixture 1 to the mounting portion. At this time, the bolt used when attaching the lighting fixture 1 is attached to the mounting portion, the bolt is passed through the round hole 132 of the daruma hole 131, and the bolt is inserted into the elongated hole 133 of the daruma hole 131, so that the head of the bolt catches on the periphery of the elongated hole 133. As a result, the lighting fixture 1 is held by a bolt attached to the mounting part, with space secured between the mounting part and the arm 100 for wiring work to connect the lead wires 214 and the power line. Therefore, in the lighting fixture 1 according to this embodiment 1, wiring work to connect the lead wires 214 and the power line can be performed by a single worker. Thus, wiring work to connect the lead wires 214 and the power line is made easier in the lighting fixture 1 according to this embodiment 1.

[0020] Furthermore, the arm 100 is equipped with flanges 101 connected to the base 110, the connecting portion 130, and the mounting portion 120. In this embodiment 1, the arm 100 is equipped with flanges 101 on both sides of the end on the lateral X side. Providing flanges 101 improves the rigidity of the arm 100. In particular, when a daruma hole 131 is formed, the rigidity of the connecting portion 130 decreases. Therefore, providing flanges 101 is especially useful when a daruma hole 131 is formed. In addition, by providing flanges 101, twisting of the arm 100 can be suppressed when a torsional load is applied to the arm 100. Note that the flanges 101 only need to be connected to a part of the mounting portion 120.

[0021] The light source unit 200 includes a light source 230, a cover 201 that covers the light source 230, and a light source holding unit 210 that holds the light source 230.

[0022] The light source 230 according to this embodiment 1 uses light-emitting elements. The light source 230 comprises a substrate 231 and a plurality of light-emitting elements 232 mounted on the substrate 231. The cover 201 comprises a main portion 202 and a flange portion 203. The main portion 202 covers the light source 230 from below and is formed of, for example, a diffusive material. The flange portion 203 protrudes laterally from the outer peripheral edge of the main portion 202 toward the outside of the main portion 202. The flange portion 203 is fixed, for example, to the base 212 of a heat sink 211, which will be described later.

[0023] The light source holder 210 includes a heat sink 211, a top plate 215, a column 220, and lead wires 214.

[0024] The heat sink 211 dissipates heat emitted from the light source 230 and comprises a base 212 and a plurality of fins 213. The base 212 is a plate-shaped member, and the substrate 231 of the light source 230 is provided on its lower surface. The plurality of fins 213 are provided on the upper surface of the base 212. In this embodiment 1, the base 212 and the fins 213 are integrally formed by press-forming an aluminum plate. Note that if the heat emitted from the light source 230 can be sufficiently dissipated by the base 212 alone, the fins 213 do not need to be provided.

[0025] The top plate 215 is a plate-shaped member and is positioned above the heat sink 211. The top plate 215 prevents objects around the lighting fixture 1 from coming into contact with the fins 213 of the heat sink 211. The top plate 215 also prevents dust from adhering to the heat sink 211 and the light source 230, etc. Multiple columnar parts 220, which are components that ensure the rigidity of the light source holder 210, are connected to the top plate 215. In other words, the top plate 215 is a component that connects multiple columnar parts 220, which are components that ensure the rigidity of the light source holder 210. Therefore, the top plate 215 also contributes to ensuring the rigidity of the light source holder 210. Note that some conventional lighting fixtures have a power supply provided between the top plate 215 and the arm 100. In the lighting fixture 1 according to this embodiment 1, a power supply may also be provided between the top plate 215 and the arm 100.

[0026] As described above, the column portion 220 is a component that ensures the rigidity of the light source holding portion 210. The column portion 220 is made of a highly rigid material such as iron or stainless steel. The column portion 220 comprises a main portion 221, a pair of side portions 224, an upper portion 225, a lower portion 226, and a holding portion 227.

[0027] The main part 221 is rectangular in shape and is positioned opposite the lower part of the mounting portion 120 of the arm 100. The main part 221 has a female thread 222 into which the bolt 10 is screwed. In this embodiment 1, the female thread 222 is formed in the main part 221 by forming a through hole in the plate-shaped portion that constitutes the main part 221 and attaching a nut positioned opposite the through hole to the plate-shaped portion. The main part 221 also has a marking 223 that is used when adjusting the angle of the light source holding portion 210 relative to the arm 100.

[0028] The pair of side portions 224 protrude from the lateral ends of the main portion 221 toward the interior of the light source holding portion 210. The pair of side portions 224 serve to suppress twisting of the column portion 220. In addition, the pair of side portions 224 are provided around the outer edge of the base 212 of the heat sink 211. Therefore, when the main portion 221 attempts to move due to shaking of the lighting fixture 1, the pair of side portions 224 come into contact with the base 212 of the heat sink 211, suppressing the movement of the main portion 221.

[0029] The upper portion 225 protrudes from the upper end of the main portion 221 toward the interior of the light source holding portion 210. The top plate 215 is fixed to the upper portion 225 by fastening means such as screws. The lower portion 226 protrudes from the lower end of the main portion 221 toward the interior of the light source holding portion 210. The base 212 of the heat sink 211 is fixed to the lower portion 226 by fastening means such as screws. The holding portion 227 is formed in a roughly L-shape and protrudes from the lower end of the main portion 221 toward below the lower portion 226. The lower part of the holding portion 227 is positioned below the flange portion 203 of the cover 201, preventing the cover 201 from falling.

[0030] The lead wire 214 is a wire that supplies power from the power source to the light source 230. One end of the lead wire 214 is connected to the light source 230. The other end of the lead wire 214 is connected to the power line that runs from the power source to the mounting location.

[0031] In the lighting fixture 1 configured in this way, by tightening the bolt 10 screwed into the female thread 222 of the column portion 220 of the light source holder 210, the mounting portion 120 of the arm 100 is sandwiched between the main portion 221 of the column portion 220 and the head of the bolt 10, thereby fixing the light source holder 210 to the arm 100. Furthermore, by loosening the bolt 10 screwed into the female thread 222 of the column portion 220 of the light source holder 210, the bolt 10 becomes movable within the elongated hole 122 of the mounting portion 120 of the arm 100. As a result, the light source holder 210 becomes movable in the second direction, which is the direction in which the elongated hole 122 extends. Specifically, in this embodiment 1, the light source holder 210 becomes movable in the lateral direction X. Furthermore, by loosening the bolt 10 screwed into the female thread 222 of the column portion 220 of the light source holder 210, the light source holder 210 becomes rotatable around the bolt 10 as the center of rotation.

[0032] Next, we will explain the method of attaching the lighting fixture 1 to the mounting part 1000 by screwing a bolt into the female thread formed in the mounting part 1000. The mounting part 1000 is, for example, an exposed box.

[0033] Figures 9 to 11 are side views of the lighting fixture according to this embodiment 1, observed in the lateral direction Y, and are diagrams for explaining the method of installing the lighting fixture. When attaching the lighting fixture 1 to the mounting part 1000, first loosen the bolt 10. Then, as shown by the black arrow in Figure 9, move the bolt 10 to the first end 122a, which is one end of the elongated hole 122. As a result, as shown in Figure 10, the light source holder 210 moves together with the bolt 10 toward the first end 122a of the elongated hole 122. After that, rotate the light source holder 210 around the bolt 10, as shown by the black arrow in Figure 10. Then, tighten the bolt 10 to fix the light source holder 210 to the arm 100.

[0034] As a result, as shown in Figure 11, the light source holder 210 is retracted from below the arm 100. When screwing a bolt into the female thread of the mounting part 1000, a tool 1100 such as an electric drill is usually used. In this case, as shown in Figure 11, in the lighting fixture 1 according to this embodiment 1, the light source holder 210 can be positioned in a location that does not interfere with the tool 1100. Specifically, in the lighting fixture 1 according to this embodiment 1, when the arm 100 and the light source holder 210 are observed in the first direction, the vertical direction Z, with the light source holder 210 positioned in front of the arm 100, when the bolt 10 is moved to the first end 122a of the elongated hole 122 and the light source holder 210 is rotated around the bolt 10, all of the multiple mounting holes 111 become visible. Furthermore, when the light source holder 210 is positioned in front of the arm 100, observing the arm 100 and the light source holder 210 in the first direction, the vertical direction Z, means observing the arm 100 and the light source holder 210 from the bottom of the paper in Figure 11.

[0035] After fixing the light source holder 210 to the arm 100 in the state shown in Figure 11, a tool 1100 such as an electric drill, which is normally used for mounting lighting fixtures, is used to screw the bolts inserted into each mounting hole 111 of the arm 100 into the female threads of the mounting part 1000. This fixes the arm 100 to the mounting part 1000, and the lighting fixture 1 is attached to the mounting part 1000.

[0036] After attaching the lighting fixture 1 to the mounting part 1000, loosen the bolt 10 and rotate the light source holder 210 in the opposite direction to the black arrow shown in Figure 10. Then, move the light source holder 210 to the position where the lighting fixture 1 will be used. In this embodiment 1, insert the bolt 10 into the recess 123 of the mounting part 120 of the arm 100. Then, adjust the angle of the light source holder 210 relative to the arm 100 to the angle at which the lighting fixture 1 will be used, tighten the bolt 10, and fix the light source holder 210 to the arm 100.

[0037] As described above, the lighting fixture 1 according to this embodiment 1 comprises an arm 100 having a mounting hole 111 formed therein and attached to a mounting part 1000 using the mounting hole 111, a light source holder 210 holding a light source 230, and a bolt 10 fixing the light source holder 210 to the arm 100. The arm 100 comprises a base 110 having a mounting hole 111 formed therein and a mounting part 120 extending from the base in a first direction. The mounting part 120 has an elongated hole 122 that extends in a second direction inclined with respect to the first direction. The light source holder 210 has a female thread 222 into which the bolt 10 inserted into the elongated hole 122 is screwed. Furthermore, when the bolt 10 is loosened, the light source holder 210 is rotatable about the bolt 10 and is configured to move in the second direction.

[0038] In the lighting fixture 1 configured in this way, by loosening the bolt 10 that fixes the light source holder 210 to the arm 100, the light source holder 210 becomes rotatable around the bolt 10 and movable in the second direction, which is the direction in which the elongated hole 122 is formed. Therefore, in the lighting fixture 1 according to this embodiment 1, when attaching the lighting fixture 1 to the mounting part 1000, the position of the light source holder 210 can be moved from the position in which the lighting fixture 1 is used and rotated at the moved position. As a result, in the lighting fixture 1 according to this embodiment 1, when attaching the lighting fixture 1 to the mounting part 1000, the light source holder 210 can be positioned in a position that does not interfere with the tool 1100. Therefore, the lighting fixture 1 according to this embodiment 1 can be made larger than conventional lighting fixtures that are attached to mounting parts such as exposed boxes.

[0039] Furthermore, with such a miniaturized lighting fixture 1, when attaching the lighting fixture 1 to the mounting part 1000, no special tools for the lighting fixture 1 are required, and tools such as electric drills 1100 that are normally used for attaching lighting fixtures can be used. In addition, such a miniaturized lighting fixture 1 can also reduce weight compared to conventional lighting fixtures that are attached to mounting parts such as exposed boxes.

[0040] In conventional lighting fixtures that are attached to mounting surfaces such as exposed boxes, miniaturization may be possible by disassembling the mounting member and the light source holder and attaching the mounting member to the mounting surface. This is because interference between the light source holder and tools can be prevented. However, with such a configuration, the installation of the lighting fixture becomes complicated, and there is a possibility that the light source holder may fall off. On the other hand, in the miniaturized lighting fixture 1 as in this embodiment 1, such complicated installation can be prevented, and the falling of the light source holder 210 can also be prevented.

[0041] Embodiment 2. In Embodiment 1, the lighting fixture 1 was configured such that when the arm 100 was fixed to the mounting part 1000, the light source holding part 210 was retracted to one end of the elongated hole 122. However, as shown in Embodiment 2, the lighting fixture 1 may also be configured such that when the arm 100 is fixed to the mounting part 1000, the light source holding part 210 is retracted to both ends of the elongated hole 122. In Embodiment 2, items not specifically described are the same as in Embodiment 1, and the same functions and configurations as in Embodiment 1 are described using the same reference numerals.

[0042] Figure 12 is a side view of the lighting fixture according to this second embodiment, observed in the lateral direction Y. In this second embodiment, when the arm 100 is fixed to the mounting portion 1000, the light source holding portion 210 is retracted at both the first end 122a and the second end 122b of the elongated hole 122. Therefore, when the lighting fixture 1 is in use, the position of the light source holding portion 210 is the position where the bolt 10 is placed between the first end 122a and the second end 122b of the elongated hole 122. Consequently, when a recess 123 is formed in the mounting portion 120 of the arm 100, the recess 123 communicates with the first end 122a and the second end 122b of the elongated hole 122, as shown in Figure 13 below.

[0043] Next, a method for attaching the lighting fixture 1 according to this second embodiment to the mounting portion 1000 will be described.

[0044] Figures 13 to 15 are side views of the lighting fixture according to this second embodiment, observed in the lateral direction Y, and are diagrams for explaining the method of installing the lighting fixture. When attaching the lighting fixture 1 to the mounting part 1000, first loosen the bolt 10. Then, as shown by the black arrow in Figure 12, move the bolt 10 to the first end 122a of the elongated hole 122. As a result, as shown in Figure 13, the light source holder 210 moves together with the bolt 10 toward the first end 122a of the elongated hole 122. After that, rotate the light source holder 210 around the bolt 10 as shown by the black arrow in Figure 13. Then, tighten the bolt 10 to fix the light source holder 210 to the arm 100.

[0045] As a result, as shown in Figure 14, the light source holder 210 is retracted from below the mounting hole 111b located on the second end 122b side of the mounting hole 111 formed in the base 110 of the arm 100. Therefore, the light source holder 210 can be positioned so as not to interfere with the tool 1100 used when screwing in the bolt inserted into the mounting hole 111b. Specifically, in the lighting fixture 1 according to this second embodiment, when the arm 100 and the light source holder 210 are observed in the first direction, the vertical direction Z, with the light source holder 210 positioned in front of the arm 100, when the bolt 10 is moved to the first end 122a of the elongated hole 122 and the light source holder 210 is rotated around the bolt 10, the mounting hole 111b, which is part of the multiple mounting holes 111, becomes visible. After fixing the light source holder 210 to the arm 100 in the state shown in Figure 14, the bolt inserted into the mounting hole 111b is screwed into the female thread of the mounting part 1000 using the tool 1100.

[0046] Next, loosen the bolt 10 and rotate the light source holder 210 in the opposite direction to the black arrow shown in Figure 13. Then, move the bolt 10 to the second end 122b of the elongated hole 122. As a result, the light source holder 210 moves together with the bolt 10 toward the second end 122b of the elongated hole 122. Then, rotate the light source holder 210 further around the bolt 10 in the opposite direction to the black arrow shown in Figure 13. Finally, tighten the bolt 10 to fix the light source holder 210 to the arm 100.

[0047] As a result, as shown in Figure 15, the light source holder 210 is retracted from below the mounting hole 111a located on the first end 122a side of the mounting hole 111 formed in the base 110 of the arm 100. Therefore, the light source holder 210 can be positioned so as not to interfere with the tool 1100 used when screwing in the bolt inserted into the mounting hole 111a. Specifically, in the lighting fixture 1 according to this second embodiment, when the light source holder 210 is positioned in front of the arm 100, and the arm 100 and light source holder 210 are observed in the first direction, the vertical direction Z, when the bolt 10 is moved to the second end 122b of the elongated hole 122 and the light source holder 210 is rotated around the bolt 10, all of the remaining mounting holes 111a among the multiple mounting holes 111 become visible. After fixing the light source holder 210 to the arm 100 in the state shown in Figure 15, the bolt inserted into the mounting hole 111a is screwed into the female thread of the mounting part 1000 using the tool 1100. This fixes the arm 100 to the mounting part 1000, and the lighting fixture 1 is attached to the mounting part 1000.

[0048] After attaching the lighting fixture 1 to the mounting portion 1000, the bolt 10 is loosened and the light source holder 210 is rotated. Then, the light source holder 210 is moved to the position where the lighting fixture 1 will be used. In this second embodiment, the bolt 10 is inserted into the recess 123 of the mounting portion 120 of the arm 100. Then, the angle of the light source holder 210 relative to the arm 100 is adjusted to the angle at which the lighting fixture 1 will be used, and the bolt 10 is tightened to fix the light source holder 210 to the arm 100.

[0049] As described above, in the lighting fixture 1 according to this second embodiment, similar to the first embodiment, when attaching the lighting fixture 1 to the mounting part 1000, the position of the light source holding part 210 can be moved from the position in which the lighting fixture 1 is used and rotated at the moved position. As a result, in the lighting fixture 1 according to this second embodiment, similar to the first embodiment, when attaching the lighting fixture 1 to the mounting part 1000, the light source holding part 210 can be positioned in a position that does not interfere with the tool 1100. Therefore, in the lighting fixture 1 according to this second embodiment, similar to the first embodiment, it is possible to suppress the increase in size compared to conventional lighting fixtures that are attached to mounting parts such as exposed boxes.

[0050] Furthermore, in the lighting fixture 1 configured as in this second embodiment, the lighting fixture 1 can be made symmetrical when observed in the lateral direction Y. Therefore, the lighting fixture 1 according to this second embodiment can have a more stable center of gravity compared to the lighting fixture 1 shown in the first embodiment. On the other hand, the lighting fixture 1 shown in the first embodiment requires fewer movements of the light source holding part 210 when fixing the arm 100 to the mounting part 1000 compared to the lighting fixture 1 according to this second embodiment. Therefore, the lighting fixture 1 shown in the first embodiment is easier to attach to the mounting part 1000 compared to the lighting fixture 1 according to this second embodiment. [Explanation of symbols]

[0051] 1 Lighting fixture, 10 Bolt, 100 Arm, 101 Flange, 110 Base, 111 (111a, 111b) Mounting holes, 112 Dimpled hole, 113 Mounting hole, 114 Wiring hole, 120 Mounting part, 121 Protrusion, 122 Slotted hole, 122a First end, 122b Second end, 123 Recess, 124 Marking, 130 Connection part, 131 Dimpled hole, 132 Round hole, 133 Slotted hole, 200 Light source unit, 201 Cover, 202 Main part, 203 Flange, 210 Light source holder, 211 Heat sink, 212 Base, 213 Fin, 214 Lead wire, 215 Top plate, 220 Column part, 221 Main part, 222 Female thread, 223 Marking, 224 side, 225 top, 226 bottom, 227 holding part, 230 light source, 231 substrate, 232 light-emitting element, 1000 mounting part, 1100 tool.

Claims

1. An arm having a base portion that is attached to the mounting portion, and a mounting portion that extends from the base portion in a first direction, A light source holder that holds the light source, A bolt is screwed into the light source holder and attaches the light source holder to the arm, Equipped with, The mounting portion is formed such that a bolt insertion portion into which the bolt is inserted penetrates the mounting portion and extends in a second direction that is inclined with respect to the first direction. The light source holder is movable in the second direction and rotatable about the bolt as the center of rotation, with the bolt inserted into the bolt insertion portion. Lighting fixtures.

2. The mounting portion has a recess into which the bolt is inserted, which is formed so as to penetrate the mounting portion and move away from the base and connect to the bolt insertion portion. The light source holder is movable in the direction in which the recess is formed when the bolt is inserted into the recess, and is rotatable about the bolt as the center of rotation. The lighting fixture according to claim 1.

3. The aforementioned recess is Formed from the edge of the bolt insertion portion, The lighting fixture according to claim 2.

4. The aforementioned light source holding unit is The bolt is tightened to secure it to the arm. A lighting fixture according to any one of claims 1 to 3.

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