Innovative vibration depressant for luminaire

Abstract

A luminaire (110), comprising: a chassis (205) having a hole (205a) configured to receive a pole (105); a bracket (217) including an arch (217a), a first through hole (217bl) disposed on a first side of the arch (217a) and a second through hole (217b2) on a second side of the arch (217a) opposite the first side; a vibration depressor (215) including a first bolt sleeve (405a), a first outer cylinder (410a) surrounding the first bolt sleeve (405a), and a first cap (415a) connected to the first bolt sleeve (405a), spaced apart from the first outer cylinder (410a), wherein the first bolt sleeve (405a) between the first cap (415a) and the first outer cylinder (410a) is disposed in the first through hole (217bl), and wherein the arch (217a) is configured to retain the pole (105).

Description

[0001] 2024PF80257

[0002] 1

[0003] INNOVATIVE VIBRATION DEPRESSANT FOR LUMINAIRE

[0004] BACKGROUND

[0005] 1. Field

[0006] The disclosure relates to luminaire. More particularly, the disclosure relates to reducing amplification of the vibrations to luminaires.

[0007] 2. Description of the Related Art

[0008] Outdoor luminaires can be attached to lighting poles. The lighting poles are tall and slender are susceptible to wind induced vibrations. The wind induced vibrations can be transferred to luminaires through bolted connections. The bolted connections can wear out, thereby reducing the life span of the luminaire or requiring expensive repairs. Placing a dampener within the lighting pole may reduce wind induced vibrations. However, the dampener may be expensive and installment may be a rather involved process.

[0009] US20040095773A1 relates to a universal mount luminaire is disclosed. The luminaire has a support arm which has integrated therein structure for both davit arm mounting and for direct pole mounting. The universal mount luminaire of the present invention also provides a leveling mechanism within the support mount or support arm so that in davit arm mounting, the luminaire may be properly angularly adjusted.

[0010] JP2019140051A relates to a lighting device that includes a light emitting unit, a bracket, a vibration-proof member to be attached to the bracket, and a fixing member for fixing the vibration-proof member to an object to be mounted. The anti -vibration member comes into pressure contact with the tubular portion through which the fixing member is inserted, the annular protrusion protruding outward from the outer peripheral surface of the tubular portion, the holding groove of the bracket, and the object to be mounted. It has a first elastic protrusion and a second elastic protrusion that presses and contacts the fixing member.

[0011] Additionally, there is perception that if a pole can survive a heavy fixture lighting the pole can survive with a lighter weight Light Emitting Diode (LED) luminaire. This is not always true as even light weight fixtures pole may see wind induced loads which could cause damage to luminaire. 2024PF80257

[0012] 2

[0013] SUMMARY

[0014] According to certain embodiments, a luminaire comprises: a chassis having a hole configured to receive a pole; a bracket including an arch, a first through hole disposed on a first side of the arch and a second through hole on a second side of the arch opposite the first side; a vibration depressor including a first bolt sleeve, a first outer cylinder surrounding the first bolt sleeve, and a first cap connected to the first bolt sleeve, spaced apart from the first outer cylinder, wherein the first bolt sleeve between the first cap and the first outer cylinder is disposed in the first through hole, and wherein the arch is configured to retain the pole.

[0015] According to certain embodiments, a luminaire comprises: a chassis having a hole, configured to receive a pole; a bracket, the bracket including an arch and a first through hole disposed on a first side of the arch and a second through hole on a second side of the arch opposite of the first side; and a vibration depressor in contact with the bracket the vibration depressor including a first outer cylinder and a second outer cylinder connected to the first outer cylinder by a bridge, and wherein the bridge makes continuous contact with the arch, and wherein the arch and a bridge are configured to retain a pole.

[0016] According to certain embodiments, a method comprises: fitting a vibration depressor with a bracket; guiding an end of a light pole through a hole of a chassis of a luminaire; positioning the vibration depressor and the bracket over the light pole; and placing bolts through the through holes of the bracket and screw holes in the chassis.

[0017] BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0019] Fig. l is a block diagram of a streetlight in accordance with an embodiment of the disclosure;

[0020] Fig. 2 is a block diagram of a luminaire in accordance with an embodiment of the disclosure;

[0021] Fig. 3 is a cross section of the luminaire in accordance with an embodiment of the disclosure;

[0022] Fig. 4A is a block diagram of a vibration depressor in accordance with an embodiment of the disclosure;

[0023] Fig. 4B is a block diagram of a fastener in accordance with an embodiment of the disclosure; 2024PF80257

[0024] 3

[0025] Fig. 4C is a block diagram of a vibration depressor in accordance with another embodiment of the disclosure.

[0026] Fig. 5 is a block diagram of a method for installing a luminaire; and

[0027] Fig. 6 is a graph describing vibration amplitude as a function of frequency in accordance with an embodiment of the disclosure.

[0028] DETAILED DESCRIPTION

[0029] It should be appreciated that various embodiments of the present disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. With regard to the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It is to be understood that a singular form of a noun corresponding to an item may include at least one of the things, unless the relevant context clearly indicates otherwise. As used herein, each of such phrases as "A or B," "at least one of A and B," "at least one of A or B," "A, B, or C," "at least one of A, B, and C," and "at least one of A, B, or C," may include any one of, or all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as "1st" and "2nd," or "first" and "second" may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (e.g., importance or order). It is to be understood that if an element (e.g., a first element) is referred to, with or without the term "operatively" or "communicatively", as "coupled with," "coupled to," "connected with," or "connected to" another element (e.g., a second element), it means that the element may be coupled with the other element directly (e.g., wiredly), wirelessly, or via a third element.

[0030] As used herein, the term "module" may include a unit implemented in hardware, software, or firmware, and may interchangeably be used with other terms, for example, "logic," "logic block," "part," or "circuitry". A module may be a single integral component, or a minimum unit or part thereof, adapted to perform at least one functions. For example, according to an embodiment, the module may be implemented in a form of an application-specific integrated circuit (ASIC).

[0031] It shall be understood in this document that “detection” or “detecting” a condition is not necessarily direct detection or detecting of the condition. For example, detection of a condition can include detection of a circumstance that logically implies the condition. 2024PF80257

[0032] 4

[0033] It shall also be understood that an action that occurs “in response to,” “responsive to”, or “when” to an event, shall not be limited to directly “in response to”, “responsive to” or “when” the event occurs or to the first action that occurs, but may be “in response to,” “responsive to,” or “when” any number of other intervening actions that logically imply that the event has occurred.

[0034] Certain embodiments presented herein may provide a low-cost molded rubber part that integrated with a pole claim for a streetlight. The molded rubber part helps with vibration dampening, resulting in avoidance of the amplification of the bending amplitude to mitigate failures of outdoor fixtures.

[0035] Referring now to Fig. 1, there is illustrated a streetlight 100 in accordance with an embodiment of the disclosure. The streetlight 100 can be mounted adjacent to a road and provide high lumens light to passengers in vehicles. The streetlight 100 can be about 10-50 ft tall, depending on the brightness of the light. Generally, the streetlight 100 is higher when brighter light is emitted.

[0036] The streetlight 100 comprises a pole 105, and a luminaire 110. The luminaire 110 is generally a case that houses the light source. The case is mounted towards the top of the pole 105. The light source can be, for example, light emitting diodes (LEDs). The luminaire 110 includes an interface that fastens the luminaire 110 to the pole 105.

[0037] The slender nature of the pole 105 and the weight of the luminaire 110 makes it susceptible to the wind. The wind causes vibrations on the interface connecting the luminaire 110 to the pole 105. The vibrations create alternating displacement patterns and bending that causes fatigue failure in the fastening of the luminaire 110 to the pole. However, the luminaire 110 includes a vibration depressor. In certain embodiments, the vibration depressors may dampen the vibration and reduce the bending amplitude to mitigate failures.

[0038] Referring now to Fig. 2, there is illustrated a block diagram of a luminaire 110 in accordance with an embodiment of the disclosure. The luminaire 110 includes a chassis 205, bolts 210, vibration depressors 215, brackets 217, light source 220, and a screen 225.

[0039] The chassis 205 can receive the light source 220 and be covered by the screen 225. The light source 220 can include, for example, light emitting diodes (LEDs), though it is not so limited. The screen 225 protects the light source 220 from the elements.

[0040] The chassis 205 includes a hole 205a, and a recess 205b. The luminaire 110 receives the pole 105 through the hole 205a, such that one end of the pole 105 is disposed in the recess 205b. The end of the pole 105 can be fastened into the recess 205b by the brackets 2024PF80257

[0041] 5

[0042] 217 that are screwed in by bolts 210. In certain embodiments, the brackets 217 can comprises metallic material.

[0043] The vibration depressors 215 disposed such that there at least one portion that is disposed between the head of the bolts 210 and the bracket 217, at least one portion that is disposed between the bracket 217 and the chassis 205, at least one portion between the bolt 210 and the chassis 205, and at least one portion that is between the brackets 217 and the pole 105.

[0044] In certain embodiments, the vibration depressors 215 can be made of neoprene rubber, and manufactured by injection molding. The neoprene rubber may have the least stiffness during compression. Accordingly, during movement of the pole 105 due to the wind, the vibration depressors 215, the energy of the vibration is absorbed by the vibration depressors 215 due the higher damping of the neoprene rubber. The vibration depressors 215 can absorb energy from movement in all three spatial dimensional directions.

[0045] A cross section along line A - A’ will be described below.

[0046] Referring to Fig. 3, there is illustrated a cross section of the luminaire 110 in accordance with an embodiment of the disclosure. The pole 105 is received by the recess 205b of the luminaire 110. Bracket 217 is disposed over the pole 105. Bolts 210 are apply downward pressure to the bracket 217, causing the bracket 217 to apply a downward for to the pole 105, securing it into the recess 205b of the luminaire 110.

[0047] The vibration depressors 215 includes a connection layer 215a, an intermediate layer 215b, a countersunk 215c, and bridge 215d. The vibration depressor 215 is disposed such that the connection layer is disposed between the head of the bolts 210 and the top of bracket 217, and the side surface of the bolt 210 and the surface of the bracket 217 that forms a through hole. The intermediate layer 215b is disposed between the bottom of the bracket 217 and the chassis 205. The countersunk 215c is disposed between the bolt 210 and the chassis 205. The bridge 215d is disposed between the bracket 217 and the pole 105.

[0048] The vibration depressor 215 can compress during displacement in all three spatial directions, thereby reducing stress onto the bolts 210 and the bracket 217. For example, during the displacement along the X and Z axis, the countersunk 215c and the portion of the connection layer 215a between the bolt 210 and the bracket 217, compress and reduce stress between the sides of the bolt 210 and the sides of the through hole of the bracket 217 and between the bolt 210 and the chassis 205. During displacement along the Y axis, the intermediate layer 215b and the bridge 215d compress, reducing the stress between the bracket 217 and the chassis 205 and the pole 105 and the bracket 217. 2024PF80257

[0049] 6

[0050] Referring now to Fig. 4A, there is illustrated a block diagram of a vibration depressor 215 in accordance with an embodiment of the disclosure. The vibration depressor 215 includes a connection layer 215a, an intermediate layer 215b, a countersunk 215c, and a bridge 215d.

[0051] In certain embodiments, the vibration depressor 215 can include two bolt sleeves 405a ,405b, two outer cylinders 410a, 410b, two caps 415a, 415b, and a bridge 420. The bolt sleeves 405a ,405b can form portions of the connection layer 215a and countersunk 215c and may have a radius that is within a threshold of the radius of the shank of the bolt 210. The radius of the bolt sleeves 405a ,405b may be set such that the bolt sleeve can be disposed between the shank of the bolt 210 and the screw hole in the chassis 205 and the through hole in the bracket 217.

[0052] The outer cylinders 410a, 410b can have an inner radius that is equal to the radius of the bolt sleeves 405a ,405b. In certain embodiments, the outer cylinders 410a, 410b can be integral with the bolt sleeves 405a ,405b. The outer cylinders 410a, 410b can have an outer radius that is at least the radius of the head of the bolt 210. The caps 415a, 415b can comprise a disk connected outside the bolt sleeves 405a ,405b. In certain embodiments, the caps 415 can be integral to the bolt sleeves 405a, 405b. In certain embodiments, the caps 415a, 415b can have substantially the same radius as the outer radius of the outer cylinders 410a, 410b.

[0053] The vibration depressor 215 can be configured to receive a bracket 217 at the connection layer 215a. Accordingly, the distance between the outer cylinders 410a, 410b can be approximately the same as the width of the bracket 217. The bridge 215d can extend from the tops of the outer cylinders 410a, 410b and be shaped to the counters of the bracket 217. The caps 415 can be configured to be deformable such that the caps 415a, 415b can traverse through holes of the bracket 217, even though the caps have a larger radius.

[0054] Referring now to Fig. 4B, there is illustrated a block diagram of a fastener 400 in accordance with an embodiment of the disclosure. The fastener 400 comprises a bracket 217 and a vibration depressor 215. The bracket 217 can comprise an arch 217a. On each end of the arch 217a can be through holes 217b configured to receive bolts 210 (not shown). The arch 217a can be configured to make contact with the curvature of a pole 105 (not shown). When bolts 210 are inserted into the through holes 217b, the arch 271a can apply a downward force against the pole 105, forcing it into recess 205b of the chassis of the luminaire 205. 2024PF80257

[0055] 7

[0056] In certain embodiments, the vibration depressor 215 can include two bolt sleeves 405a, 405b, two outer cylinders 410a, 410b, two caps 415, a bridge 420. The bolt sleeves 405a, 405b can form portions of the connection layer 215a and countersunk 215c and may have a radius that is within a threshold of the radius of the shank of the bolt 210. The radius of the bolt sleeves 405a, 405b may be set such that the bolt sleeve can be disposed between the shank of the bolt 210 and the screw hole in the chassis 205 and the through hole in the bracket 217.

[0057] The portions of the bolt sleeves 405a, 405b that are between the caps 415 and the outer cylinders 410a, 410b are disposed in the through holes 217b of the bracket 217. The caps 415 can be disposed to make contact with one surface of the bracket 217. The distance between the outer cylinders 410a, 410b can be approximately the same as the width of the bracket 217, such that the outer cylinders 410a, 410b make contact with the opposite surface of the bracket 217. The bridge 215d can extend from the tops of the outer cylinders 410a, 410b and make continuous contact with the arch 217a. In certain embodiments, an adhesive may adhere the bridge 215d to the arch 217a.

[0058] In certain embodiments, the vibration depressor may 215 may not include the bridge 420. Referring now to Fig. 4C, there is illustrated a vibration depressor 215 in accordance with another embodiment of the disclosure. The vibration depressor 215 includes a bolt sleeve 405, surrounded by an outer cylinder 410. Cap 415 can be disposed on one end of the bolt sleeve 405. The space between the bolt sleeve 405 may be configured to accommodate insertion into a through hole 217b of the bracket 217, such that the bolt sleeve 405 is snug against the perimeter of the through hole 217b, the outer cylinder 410 is in contact with one surface of the bracket 217 that is proximate to the through hole 217, and the cap 415 is on contact with the opposite surface of the bracket 217.

[0059] Referring now to Fig. 5, there is illustrated a flow diagram of a method of fastening a luminaire 110 to a pole 105 in accordance with an embodiment of the disclosure.

[0060] At 510, the vibration depressor 215 can be fitted with the bracket 217. Fitting the vibration depressor with the bracket 217 can include pressing the caps 415 into the through holes 217b of the bracket 217. Pressing the caps 415 may deform the caps 415 causing them to pass through the through holes 217b of the bracket 217. As a result, the portions of the bolt sleeves 405a, 405b that are between the caps 415 and the outer cylinders 410a, 410b become disposed in the through holes 217b of the bracket 217. The caps 415 cover one surface of the bracket 217, while the outer cylinders 410a, 410b contact the 2024PF80257

[0061] 8 opposite surface of the bracket 217. Additionally, the bridge 420 may form continuous contact with the arch 217a.

[0062] At 520, an end of the light pole 105 is guided through the hole 205a of the chassis 205 into the recess 205b.

[0063] At 530, the vibration depressor 215 and bracket 217 are placed over the end of the light pole 105, such that the countersinks 215c (or the portions of the bolt sleeves 405a, 405b that extend from the outer cylinder 410a, 410b are disposed into the screw holes of the chassis 205.

[0064] At 540, the bolts 210 are placed through the through holes of the 217b of the bracket 217 and into the screw holes of the chassis 205.

[0065] Fig. 6 is a graph describing vibration amplitude as a function of frequency for a streetlight 100 with a vibration depressor 215 and streetlight 100 without a vibration depressor. The peak amplitude of the streetlight 100 without the vibration depressor 215 is 18.813 at the resonant frequency of approximately 85 Hz, equating to a stress of 10,247.33 Kg / in2. This results in 10.8 million cycles before failure. The peak amplitude of the streetlight 100 with the vibration depressor 215 is 18.546 at a slightly lower resonant frequency, equating to a stress of 10,015.49 Kg / in2. This results in 11.6 million cycles before failure. The foregoing represents a 7.38% increase in lifespan.

[0066] According to certain embodiments, a luminaire (110) comprises: a chassis (205) having a hole (205a) configured to receive a pole (105); a bracket (217) including an arch (217a), a first through hole (217b 1) disposed on a first side of the arch (217a) and a second through hole (217b2) on a second side of the arch (217a) opposite the first side; a vibration depressor (215) including a first bolt sleeve (405a), a first outer cylinder (410a) surrounding the first bolt sleeve (405a), and a first cap (415a) connected to the first bolt sleeve (405a), spaced apart from the first outer cylinder (410a), wherein the first bolt sleeve (405a) between the first cap (415a) and the first outer cylinder (410a) is disposed in the first through hole (217b 1), and wherein the arch (217a) is configured to retain the pole (105).

[0067] According to certain embodiments, the vibration depressor (215) comprises: a second outer cylinder (410b); a bridge (420) connecting the first outer cylinder (410a) to the second outer cylinder (410b); and a second bolt sleeve (405b) disposed inside the second outer cylinder (410b), and wherein the bridge (420) makes continuous contact with the arch (217a).

[0068] According to certain embodiments, the vibration depressor (215), further comprises a second cap (415b) connected to the second bolt sleeve (405b), spaced apart from 2024PF80257

[0069] 9 the second outer cylinder (410b), such that the second bolt sleeve (405b) between the second outer cylinder (410b) and the second cap (415b) is disposed in the second through hole (217b2).

[0070] According to certain embodiments, the first cap (415a) is disposed on a first side of the first outer cylinder (410a); the second cap (415b) is disposed on the first side of the second outer cylinder (410b); wherein the first bolt sleeve (405a) extends from a second side opposite to the first side of the first outer cylinder (410a); and wherein the second bolt sleeve (405b) extends from the second side opposite to the second side of the second outer cylinder (410b).

[0071] According to certain embodiments, the vibration depressor (215) comprises neoprene rubber.

[0072] According to certain embodiments, a luminaire (110) comprises: a chassis (205) having a hole (205a), configured to receive a pole (105); a bracket (217), the bracket (217) including an arch (217a), and a first through hole (217b 1) disposed on a first side of the arch (217a) and a second through hole (217b2) on a second side of the arch (217a) opposite of the first side; and a vibration depressor (215) in contact with the bracket (217) the vibration depressor (215) including a first outer cylinder (410a) and a second outer cylinder (410b) connected to the first outer cylinder (410a) by a bridge (420), and wherein the bridge (420) makes continuous contact with the arch (217a), and wherein the arch (217a) and the bridge (420) are configured to retain the pole (105).

[0073] According to certain embodiments, the vibration depressor (215) includes a first bolt sleeve (405a) disposed inside the first outer cylinder (410a) and a second bolt sleeve (405b) disposed inside the first outer cylinder (410b), wherein at least a portion of the first bolt sleeve (405a) is disposed in the first through hole (217bl) and the second bolt sleeve (405b) is disposed in the second through hole (217b2).

[0074] According to certain embodiments, the vibration depressor (215) includes comprises a first cap (415a) connected to the first bolt sleeve (405a) disposed on a surface of the bracket (217) proximate to the first through hole (217a), and a second cap (415b) connected to the second bolt sleeve (405b) disposed on a surface of the bracket (217) proximate to the second through hole (217b).

[0075] According to certain embodiments, a distance between the first cap (415a) and the first outer cylinder (410a) and a distance between the second cap (415b) and the second outer cylinder (410b) are approximately equal to the thickness of the bracket (217).

[0076] According to certain embodiments, the vibration depressor (215) comprises neoprene rubber. 2024PF80257

[0077] 10

[0078] According to certain embodiments, the bracket (217) comprises metal material.

[0079] According to certain embodiments, a method comprises: fitting (510) a vibration depressor with a bracket; guiding (520) an end of a light pole through a hole of a chassis of a luminaire; positioning (530) the vibration depressor and the bracket over the light pole; and placing (540) bolts through the through holes of the bracket and screw holes in the chassis.

[0080] According to certain embodiments, the vibration depressor comprises neoprene rubber.

[0081] According to certain embodiments, the bracket comprises metallic material. According to certain embodiments, positioning the vibration depressor and the bracket over the light pole further comprises placing countersinks of the vibration depressor into the screw holes.

[0082] While at least one embodiments of the disclosure have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope as defined by the following claims.

Claims

2024PF8025711CLAIMS:

1. A luminaire (110) compri sing : a chassis (205) having a hole (205a) configured to receive a pole (105); a bracket (217) including an arch (217a), a first through hole (217b 1) disposed on a first side of the arch (217a) and a second through hole (217b2) on a second side of the arch (217a) opposite the first side; a vibration depressor (215) including a first bolt sleeve (405a), a first outer cylinder (410a) surrounding the first bolt sleeve (405a), and a first cap (415a) connected to the first bolt sleeve (405a), spaced apart from the first outer cylinder (410a), wherein the first bolt sleeve (405a) between the first cap (415a) and the first outer cylinder (410a) is disposed in the first through hole (217b 1), and wherein the arch (217a) is configured to retain the pole (105), wherein the vibration depressor (215) comprises: a second outer cylinder (410b); a bridge (420) connecting the first outer cylinder (410a) to the second outer cylinder (410b); and a second bolt sleeve (405b) disposed inside the second outer cylinder (410b), and wherein the bridge (420) makes continuous contact with the arch (217a).

2. The luminaire (110) of claim 1, wherein the vibration depressor (215), further comprising: a second cap (415b) connected to the second bolt sleeve (405b), spaced apart from the second outer cylinder (410b), such that the second bolt sleeve (405b) between the second outer cylinder (410b) and the second cap (415b) is disposed in the second through hole (217b2).

3. The luminaire (110) of claim 2, wherein: the first cap (415a) is disposed on a first side of the first outer cylinder (410a);2024PF8025712 the second cap (415b) is disposed on the first side of the second outer cylinder (410b); wherein the first bolt sleeve (405a) extends from a second side opposite to the first side of the first outer cylinder (410a); and wherein the second bolt sleeve (405b) extends from the second side opposite to the second side of the second outer cylinder (410b).

4. The luminaire (110) of claim 1, wherein the vibration depressor (215) comprises neoprene rubber.

5. A luminaire (110) compri sing : a chassis (205) having a hole (205a), configured to receive a pole (105); a bracket (217), the bracket (217) including an arch (217a), and a first through hole (217b 1) disposed on a first side of the arch (217a) and a second through hole (217b2) on a second side of the arch (217a) opposite of the first side; and a vibration depressor (215) in contact with the bracket (217) the vibration depressor (215) including a first outer cylinder (410a) and a second outer cylinder (410b) connected to the first outer cylinder (410a) by a bridge (420), and wherein the bridge (420) makes continuous contact with the arch (217a), and wherein the arch (217a) and the bridge (420) are configured to retain the pole (105).

6. The luminaire (110) of claim 5, wherein the vibration depressor (215) includes a first bolt sleeve (405a) disposed inside the first outer cylinder (410a) and a second bolt sleeve (405b) disposed inside the first outer cylinder (410b), wherein at least a portion of the first bolt sleeve (405a) is disposed in the first through hole (217b 1) and the second bolt sleeve (405b) is disposed in the second through hole (217b2).

7. The luminaire (110) of claim 6, wherein the vibration depressor (215) includes comprises a first cap (415a) connected to the first bolt sleeve (405a) disposed on a surface of the bracket (217) proximate to the first through hole (217a), and a second cap (415b) connected to the second bolt sleeve (405b) disposed on a surface of the bracket (217) proximate to the second through hole (217b).2024PF80257138. The luminaire (110) of claim 7, wherein a distance between the first cap (415a) and the first outer cylinder (410a) and a distance between the second cap (415b) and the second outer cylinder (410b) are approximately equal to the thickness of the bracket (217).

9. The luminaire (110) of claim 5, wherein the vibration depressor (215) comprises neoprene rubber.

10. The luminaire (110) of claim 5, wherein the bracket (217) comprises metal material.

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