JP2014026937A - Hanging explosion proof lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hanging explosion proof lighting device with improved attachment workability.SOLUTION: A hanging explosion proof lighting device 1 includes a hanging bar 3 connected with a lamp fitting 10, and the hanging bar 3 is fixed to a top surface S using a terminal box 40. The terminal box 40 includes a connection ring 50 for connecting a flange fixed to an upper end 3B of the hanging bar 3 to the terminal box 40.

Description

  The present invention relates to a hanging explosion-proof lighting device fixed to a top surface.

  Conventionally, an explosion-proof illumination device includes a lamp and a hanging rod connected to the lamp, and the hanging rod is suspended from the top surface by being fixed to the top surface of the structure using a terminal box. . In the terminal box, a power line passed through a conduit provided on the top surface and a lead wire of a lamp passed through a hanging rod are connected (for example, refer to Patent Document 1).

Utility Model No. 3008676

By the way, since the explosion-proof illumination device is relatively heavy and is provided at a relatively high position such as the top surface of a factory, for example, a structure that can be easily attached is desired.
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a suspended explosion-proof illumination device with improved mounting workability.

  In order to achieve the above object, the present invention comprises a hanging explosion-proof illumination device comprising a hanging rod connected to a lamp, and the hanging rod is fixed to the top surface using a terminal box. A connecting ring for connecting a flange fixed to the upper end of the suspension rod to the terminal box is provided.

  In the above-described configuration, in addition to one of the hanging rods, the other hanging rod is connected to the lamp, the other hanging rod is fixed to the top surface using a hanging fitting, and the hanging fitting is attached to the other May be provided with an outward U-shaped groove that fits from the outside.

  The said structure WHEREIN: The said suspension metal fitting may be equipped with the stopper for preventing the escape from the said U-shaped groove | channel of the other hanging rod fitted to the said U-shaped groove | channel.

  In the above-described configuration, the suspension fitting may include a pedestal portion that is partly higher than the others and contacts the support of the other suspension rod on the seat surface of the U-shaped groove.

  In the above configuration, a rail extending in the circumferential direction is provided at a lower portion of the terminal box, the connection ring is configured by a pair of half-split ring bodies, and a circumferential groove in which the rail fits on an inner peripheral surface of each ring body. And the rail and the circumferential groove may be aligned, and the half ring bodies may be joined together with a stopper to connect the connection ring to the terminal box.

  In the above configuration, the flange includes a convex portion on the outer periphery, the connecting ring includes a concave portion in which the convex portion is fitted to the opening periphery of the bottom surface, the convex portion and the concave portion are aligned, and the bottom surface of the connecting ring is opened. When the flange is fitted and the connecting ring is rotated in the circumferential direction, a spiral groove that sandwiches the convex portion of the flange may be provided on the inner peripheral surface of the connecting ring.

  According to the present invention, since the terminal box is provided with the connection ring for connecting the flange fixed to the upper end of the suspension bar to the terminal box, the number of handling parts is reduced as compared with the case where the connection ring is provided on the suspension bar side. Therefore, the workability of mounting the explosion-proof lighting device can be improved.

It is a front view which shows the hanging explosion-proof illumination device which concerns on embodiment of this invention. It is a perspective view which shows a hanging explosion-proof illumination device. It is a perspective view which shows the other hanging rod and a hanging metal fitting. It is a figure which shows the other hanging rod and a hanging metal fitting, (A) is a front view, (B) is a side view, (C) is a top view. It is sectional drawing which shows the other hanging rod and a hanging metal fitting, (A) is a general view, (B) is an enlarged view of the range B of (A). It is a perspective view which shows a hanging metal fitting from the downward direction. It is a perspective view which shows one hanging rod and a terminal box. It is a side view which shows one hanging rod and a terminal box. It is a figure which shows the IX-IX cross section of FIG. It is a perspective view which shows one hanging stick temporarily fixed to the terminal box. It is a perspective view which shows one hanging rod and the disassembled terminal box. It is a perspective view which shows a ring. It is a front view which shows the hanging explosion-proof type illuminating device in the middle of attachment. It is a perspective view which shows the other hanging rod and hanging bracket which concern on the modification of this invention. It is a figure which shows the other hanging rod and a hanging metal fitting, (A) is a front view, (B) is a side view, (C) is a top view. It is sectional drawing which shows the other hanging rod and a hanging metal fitting.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a suspended explosion-proof illumination device according to the embodiment, and FIG. 2 is a perspective view showing the suspended explosion-proof illumination device.
The hanging explosion-proof lighting device 1 is a lighting device that can be hung from a relatively high top surface S or the like of a factory, for example, and includes a lamp 10 and a pair of hanging rods 2 and 3 connected to the lamp 10. ing. The lamp 10 is configured by supporting a light source (fluorescent tube) 11 on the lower surface of a main body 12. The light source 11 is, for example, a rod-shaped light source such as a fluorescent lamp, and two light sources 11 are provided in the present embodiment.
The main body 12 is a long box, and the light source 11 is provided along the longitudinal direction of the main body 12. A power supply device (not shown) for supplying power to the light source 11 is accommodated in the main body 12, and a lead wire or the like is connected to the power supply device. A lead wire L1 (see FIG. 13) from the power supply device passes through the one suspension rod 3 and is exposed from the upper end 3B of the one suspension rod 3.

The pair of hanging rods 2 and 3 are hollow pipes that are connected to the upper surface 12 </ b> A of the main body 12 at a distance. More specifically, two fixing tools 13 for screwing the suspension rods 2 and 3 are attached to the upper surface 12A of the main body 12 so as to be spaced apart from each other. 3 </ b> A is fixed to the main body 12 by being screwed to the fixing tool 13. The upper end 2B of the other suspension bar 2 is fixed to the top surface S using a suspension fitting 20, and the upper end 3B of one suspension bar 3 is fixed to the top surface S using a terminal box 40.
On the top surface S, a conduit P through which a power line L2 (see FIG. 13) such as a commercial power supply is passed is fixed, and the suspension fitting 20 is fixed on the top surface S so as to straddle the conduit P.

FIG. 3 is a perspective view showing the other hanging rod 2 and hanging bracket 20. FIG. 4 is a view showing the other hanging rod 2 and the hanging metal fitting 20, wherein FIG. 4 (A) is a front view, FIG. 4 (B) is a side view, and FIG. 4 (C) is a plan view. 5A and 5B are cross-sectional views showing the other hanging rod 2 and the hanging metal fitting 20. FIG. 5A is an overall view, and FIG. 5B is an enlarged view of a range V in FIG. FIG. 6 is a perspective view showing the hanging metal fitting 20 from below.
As shown in FIGS. 3 to 5, a screw portion 2C is formed at the upper end 2B of the other suspension rod 2, and two lock nuts (supports) 4 are separated from each other and screwed to the screw portion 2C. Are combined.

The hanging metal fitting 20 is, for example, a casting such as aluminum die-casting, and includes a pair of opposing wall portions 21 and a bottom portion 22 that connects the pair of wall portions 21 and is formed in a substantially U shape in a side view. A fixing portion 23 extending outward is provided at the upper end of each wall portion 21, and when the fixing portion 23 is screwed to the top surface S, the hanging bracket 20 is attached to the top surface S (FIG. 1). Fixed to.
The lock nut 4 of the other suspension rod 2 abuts on the bottom portion 22 from both sides, and the length M of the screw portion 2C of the other suspension rod 2 is equal to the bottom portion 22 and the two lock nuts abutted against the bottom portion 22. 4 and longer than the sum of the heights.

  The bottom portion 22 is formed with a U-shaped groove 24 notched in a U-shape through which the other suspension rod 2 is inserted. The U-shaped groove 24 is formed by arranging a U-shaped opening outward in the longitudinal direction of the main body 12. In addition, as shown in FIG. 6, in the bottom portion 22, pedestal portions 22 </ b> A <b> 1 and 22 </ b> B <b> 1 whose upper seat surface 22 </ b> A and lower seat surface 22 </ b> B with which the two lock nuts 4 of the other hanging rod 2 abut are higher than others. And inclined portions 22A2 and 22B2 that are inclined in the direction in which the thickness of the bottom portion 22 decreases from the pedestal portions 22A1 and 22B1. Therefore, the lock nut 4 abuts only on the pedestal portions 22A1 and 22B1, so that no force is concentrated on the seat surfaces 22A and 22B even when a lateral load is applied to the other suspension rod 2.

  Further, as shown in FIGS. 3 and 4, stoppers 22 </ b> C higher than the seating surfaces 22 </ b> A and 22 </ b> B are formed on the bottom portion 22 on both sides of the opening of the U-shaped groove 24. The other suspension rod 2 fitted in the groove 24 is prevented from escaping from the U-shaped groove 24 to the outside. Therefore, when the other suspension rod 2 is inserted into the U-shaped groove 24, the space between the lock nuts 4 is made larger than the height of the stopper 22C.

  FIG. 7 is a perspective view showing one hanging rod 3 and the terminal box 40. FIG. 8 is a side view showing one of the hanging rods 3 and the terminal box 40, and FIG. 9 is a view showing a IX-IX cross section of FIG. FIG. 10 is a perspective view showing one suspension rod 3 temporarily secured to the terminal box 40. FIG. 11 is a perspective view showing one hanging rod 3 and a disassembled terminal box 40. FIG. 12 is a perspective view showing the ring.

As shown in FIGS. 7 to 11, a disk-like flange 5 is provided on the upper end 3 </ b> B of one of the suspension rods 3. More specifically, as shown in FIG. 9, a threaded portion 3C is formed at the upper end 3B of one of the suspension rods 3 and this threaded portion 3C is screwed into a threaded hole 5A formed at the center of the flange 5. Has been. The screw hole 5 </ b> A is provided so as to penetrate the flange 5. In addition, on the lower surface of the flange 5, a boss portion 5B protruding downward is formed around the screw hole 5A. A groove 5 </ b> C for placing the O-ring 31 is formed on the upper surface of the flange 5.
As shown in FIG. 10, two convex portions 5 </ b> D extending in the circumferential direction are provided on the outer periphery of the flange 5 so as to face the center of the flange 5. A concave portion 5E is formed on the convex portion 5D, and a mark portion 5F is formed on the bottom surface of the flange 5 at a position corresponding to the concave portion 5E.

The terminal box 40 is formed in a substantially cylindrical shape, and a plurality of fixing portions 41 extending outward are provided on the side surface (outer peripheral surface) of the terminal box 40, and the fixing portions 41 are screwed to the top surface S. Thus, the terminal box 40 is fixed to the top surface S (FIG. 1).
In addition, a plurality of connection portions 42 for connecting the conduit P (FIG. 1) are provided on the side surface of the terminal box 40. In the present embodiment, a total of four connection portions 42 are formed so that the two connection portions 42 face each other, and a fixing portion 41 is formed between each connection portion 42. The connection portion 42 is a member that protrudes in a cylindrical shape from the side surface of the terminal box 40, and a screwed portion 42 </ b> A for screwing the conduit P is formed in the connection portion 42. The screwed portion 42 </ b> A penetrates the terminal box 40 and communicates with the hollow portion R of the terminal box 40.

In the terminal box 40, a hook metal fitting 45 for temporarily fastening one of the hanging rods 3 is attached. The chain 32 screwed to the upper surface of the flange 5 of the one hanging rod 3 is hooked in the terminal box 40. By hooking on the metal fitting 45, one hanging rod 3 is temporarily fixed to the terminal box 40.
A rail 43 extending outward is formed in the lower portion of the terminal box 40 in the circumferential direction, and the connecting ring 50 is engaged with the rail 43. Further, as shown in FIG. 9, a protrusion 44 protruding downward is formed on the lower surface of the rail 43 at a position corresponding to the groove 5 </ b> C of the flange 5, and the flange 5 is fixed to the connection ring 50. At this time, the protrusion 44 pushes the O-ring 31, so that the gap between the flange 5 and the terminal box 40 is sealed.

  The terminal box 40 includes a connecting ring 50 that connects the flange 5 of one suspension rod 3 to the terminal box 40. The connection ring 50 is configured by combining a pair of halved ring bodies 51. A coupling portion 52 for coupling the ring body 51 is formed at the end of the outer peripheral surface of the ring body 51, and the two ring bodies 51 are coupled to each other by screws (stoppers) 53. By doing so, a ring-shaped connecting ring 50 is obtained. A through hole 55 through which the screw 54 passes is formed on the side surface (outer peripheral surface) of each ring body 51 so as to oppose the ring body 51. On the bottom surface 50 </ b> A of each ring body 51, a mark portion 55 </ b> A is formed at a position corresponding to the through hole 55.

As shown in FIG. 12, a circumferential groove 56 into which the rail 43 fits is formed in the upper part of the inner peripheral surface 50B of each ring body 51 in the circumferential direction.
Further, on the inner peripheral surface 50B of each ring body 51, a protrusion 57 extending in the circumferential direction is formed. The top surface 57A of the ridge portion 57 is inclined so as to taper counterclockwise when viewed from below, and the base portion of the ridge portion 57 has a contact surface 57B extending vertically. As shown in FIG. 10, in the bottom surface 50 </ b> A of the connection ring 50, the width W of the recess 58 where the protrusion 57 is not provided is equal to the length W of the protrusion 5 </ b> D of the flange 5. The inner peripheral surface 50B of the ring body 51 located between the protrusion 57 and the rail 43 becomes a spiral groove 59 in which the convex portion 5D of the flange 5 is disposed.

  As shown in FIGS. 9 and 11, the connecting ring 50 is assembled by screwing the two ring bodies 51 into the terminal box 40 so that the rails 43 of the terminal box 40 fit into the circumferential grooves 56 of the ring body 51. By being fixed by 53, it is rotatably supported by the terminal box 40.

Next, a method for assembling the suspended explosion-proof illumination device 1 will be described.
FIG. 13 is a front view showing the hanging explosion-proof illumination device 1 during attachment.
First, the suspension bracket 20 and the terminal box 40 are fixed to the top surface S, and the electric wire P is connected to the terminal box 40, and the power line L <b> 2 passing through the electric wire P is connected from the connection portion 42 of the terminal box 40 to the terminal box 40. It exposes from the lower part of the connection ring 50 through the inside and the connection ring 50.

Next, as shown in FIG. 3, the other hanging rod 2 is inserted into the U-shaped groove 24 of the hanging bracket 20. Since this U-shaped groove 24 is formed in an outward U-shape in which the other suspension rod 2 is fitted from the outside, the other suspension rod 2 is fixed to the hanging bracket 20 simply by fitting the other suspension rod 2 into the U-shaped groove 24 from the outside. Therefore, the other suspension bar 2 can be easily engaged with the suspension fitting 20. At this time, the lock nut 4 is spaced apart from the thickness of the bottom 22 (stopper 22C) of the hanging bracket 20.
Next, the chain 32 screwed to the upper surface of the flange 5 of one of the hanging rods 3 is hooked on the hook metal fitting 45 in the terminal box 40, and the one hanging rod 3 is temporarily fastened. A lead wire L1 extending from the terminal box 40 and a power supply line L2 extending from the terminal box 40 are connected.

  Then, as shown in FIG. 10, if the positions of the convex portion 5D of the flange 5 and the concave portion 58 of the connecting ring 50 are not aligned, the connecting ring 50 is rotated in the circumferential direction until the convex portion 5D and the concave portion 58 are aligned. To do. Next, the convex portion 5D of the flange 5 is fitted into the concave portion 58 of the connecting ring 50 while the connected lead wire L1, the power supply line L2 (FIG. 13) and the chain 32 are accommodated in the terminal box 40, and the bottom surface of the connecting ring 50 The flange 5 is fitted into the opening 50C of 50A.

Next, the connecting ring 50 is rotated in the circumferential direction (in the present embodiment, it is rotated counterclockwise as viewed from below) until the end portion 5D1 of the convex portion 5D contacts the contact surface 57B (FIG. 12) of the connecting ring 50. At this time, the convex portion 5 </ b> D of the flange 5 is guided to the upper surface 57 </ b> A (FIG. 12) of the protrusion 57 of the connection ring 50. In this embodiment, since the upper surface 57A of the ridge 57 is an inclined surface, the convex portion 5D of the flange 5 is formed in the spiral groove 59 between the rail 43 and the upper surface 57A by rotating the connecting ring 50. It is clamped and fixed. Thereby, rotation between the connection ring 50 and the flange 5 is prevented, and it can prevent that the flange 5 remove | deviates from the connection ring 50. FIG.
In this state, since the flange 5 and the terminal box 40 are sealed by the O-ring 31, foreign matters such as moisture and dust do not enter the terminal box 40.

  Further, as shown in FIG. 7, the rotation between the connection ring 50 and the flange 5 is caused by passing the anti-rotation screw 54 through the through hole 55 of the connection ring 50 and contacting the recess 5E of the flange 5. This prevents the flange 5 from coming off the connecting ring 50. Moreover, since the flange 5 is provided with the mark portion 5F on the bottom surface corresponding to the recess 5E, and the connecting ring 50 is provided with the mark portion 55A on the bottom surface 50A corresponding to the through hole 55, the recess 5E and the through hole 55 are provided. Can be seen by the mark portions 5F and 55A. Accordingly, the screw 54 can be reliably brought into contact with the recess 5E of the flange 5.

  Finally, as shown in FIG. 1, the lock nut 4 of the other suspension bar 2 is tightened to complete the assembly of the hanging explosion-proof lighting device 1. By tightening the lock nut 4 and making the distance between the two lock nuts 4 smaller than the height of the stopper 22C, the other hanging rod fitted into the U-shaped groove 24 by the stopper 22C even when a force such as wind pressure load is applied. 2 can be prevented from escaping from the U-shaped groove 24 to the outside.

For example, when a rotatable connecting ring is provided on the side of one hanging rod, the connecting ring and one hanging rod are separated from each other. It must be held by the operator while being passed through the suspension rod.
On the other hand, in this embodiment, since the terminal box 40 is provided with the connection ring 50 for connecting the flange 5 of one suspension rod 3 to the terminal box 40, compared with the case where the connection ring is provided on the one suspension rod side. Since the number of handling parts is reduced, the mounting workability of the hanging explosion-proof lighting device 1 can be improved. Furthermore, by configuring the connection ring 50 with a pair of halved ring bodies 51, the connection ring 50 can be rotatably connected to the terminal box 40 while minimizing the number of parts.
Thus, the terminal box 40 can easily connect the lead wire L1 extending from the one suspension rod 3 and the power line L2 extending from the terminal box 40, and the suspended explosion-proof illumination device 1 to the top surface S. Easy to install.

  As described above, according to the present embodiment, the terminal box 40 includes the connection ring 50 for connecting the flange 5 fixed to the upper end 3B of the one suspension rod 3 to the terminal box 40. Compared with the case where the connecting ring is provided on one suspension rod side, the number of parts to be handled is reduced, so that the mounting workability of the suspended explosion-proof illumination device 1 can be improved.

  Further, according to the present embodiment, the other suspension rod 2 connected to the lamp 10 is provided separately from the one suspension rod 3, and the other suspension rod 2 is fixed to the top surface S using the suspension fitting 20. Since the hanging bracket 20 includes the outward U-shaped groove 24 into which the other hanging rod 2 is fitted from the outside, the other hanging rod 2 can be fixed to the hanging bracket 20 simply by fitting into the U-shaped groove 24 from the outside. The other hanging rod 2 can be easily engaged with the hanging fitting 20.

  Further, according to the present embodiment, the hanging metal fitting 20 is configured to include the stopper 22 </ b> C for preventing the other hanging rod 2 fitted in the U-shaped groove 24 from escaping outward from the U-shaped groove 24. Thereby, even if a force such as wind pressure load is applied in the longitudinal direction of the main body 12, the other suspension rod 2 fitted into the U-shaped groove 24 by the stopper 22C can be prevented from escaping from the U-shaped groove 24 to the outside.

  In addition, according to the present embodiment, the hanging bracket 20 is a base portion 22A1, 22B1 in which the lock nut 4 of the other hanging rod 2 comes into contact with the seating surfaces 22A, 22B of the U-shaped groove 24 so that a part thereof is higher than the others. It is set as the structure provided with. With this configuration, even when a force such as a wind pressure load is applied, the other suspension rod 2 fitted in the U-shaped groove 24 by the stopper 22C can be prevented from escaping from the U-shaped groove 24 to the outside.

  Moreover, according to this embodiment, the rail 43 extended in the circumferential direction is provided in the lower part of the terminal box 40, the connection ring 50 is comprised by a pair of half split ring bodies 51, and the inner peripheral surface 50B of each ring body 51 is provided. A circumferential groove 56 into which the rail 43 fits is provided, the rail 43 and the circumferential groove 56 are aligned, and the half ring bodies 51 are coupled to each other with a screw 53 so that the coupling ring 50 is coupled to the terminal box 40. By configuring the connection ring 50 with a pair of halved ring bodies 51, the connection ring 50 can be rotatably connected to the terminal box 40 while minimizing the number of parts.

  Further, according to the present embodiment, the flange 5 is provided with the convex portion 5D on the outer periphery, the connecting ring 50 is provided with the concave portion 58 in which the convex portion 5D is fitted to the periphery of the opening 50C of the bottom surface 50A, and the convex portion 5D and the concave portion 58 are aligned. When the flange 5 is fitted in the opening 50C of the bottom surface 50A of the connection ring 50 and the connection ring 50 is rotated in the circumferential direction, the spiral groove 59 that sandwiches the convex portion 5D of the flange 5 is formed on the inner periphery of the connection ring 50. It is set as the structure provided in the surface 50B. With this configuration, the convex portion 5 </ b> D of the flange 5 can be sandwiched between the spiral grooves 59, so that the flange 5 can be prevented from falling off the connection ring 50 with a relatively simple configuration.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, the lamp 10 includes a rod-shaped fluorescent lamp as a light source, but the light source is not limited to this, and may include a light emitting element such as an LED.
Moreover, in the said embodiment, although a pair of half ring body 51 was couple | bonded with the screw 53 as a stopper, the stopper of the ring body 51 is not limited to a screw.

  Further, for example, as shown in FIGS. 14 to 16, a stopper 6 formed of rubber or the like may be fitted to the upper end 2 </ b> B of the other hanging rod 2. This stopper 6 can prevent rain or dust from entering the other hanging rod 2. In addition, by providing a flange 6A that protrudes outward from the upper end 2B at the top of the stopper 6, even if the lock nut 4 is loosened during temporary fastening, the other suspension bar 2 can be removed from the suspension fitting 20. The suspended explosion-proof lighting device 1 can be attached more safely.

  Moreover, in the said embodiment, although the suspension explosion-proof illuminating device 1 was provided with a pair of suspension rods 2 and 3 in order to support the rod-shaped light source 11, it is not limited to this, For example, a suspension rod 2 may be provided.

1 Hanging explosion-proof lighting device 2, 3 Hanging rod 3B Upper end 4 Lock nut (support)
5 Flange 5D Convex part 10 Lamp 20 Hanging bracket 22A, 22B Seat surface 22A1, 22B1 Base part 22C Stopper 24 U-shaped groove 40 Terminal box 43 Rail 50 Connection ring 50A Inner peripheral surface 50B Bottom surface 50C Opening 51 Ring body 53 Screw (Stopper) )
56 Circumferential groove 58 Recess 59 Spiral groove S Top surface

Claims (6)

In a hanging explosion-proof lighting device comprising a hanging rod connected to a lamp, and this hanging rod is fixed to the top surface using a terminal box,
The terminal box includes a connection ring for connecting a flange fixed to the upper end of the suspension rod to the terminal box,
A hanging explosion-proof lighting device characterized by that. Aside from the one hanging rod, the other hanging rod connected to the lamp,
The other hanging rod is fixed to the top surface using a hanging bracket,
The suspension fitting has an outward U-shaped groove into which the other suspension rod fits from the outside.
The hanging explosion-proof illumination device according to claim 1. The suspension fitting includes a stopper for preventing the other suspension rod fitted in the U-shaped groove from escaping from the U-shaped groove to the outside.
The suspended explosion-proof illumination device according to claim 2. The suspension fitting includes a pedestal portion with which a part of the U-shaped groove is higher than the others and the support of the other suspension rod comes into contact.
The suspended explosion-proof illumination device according to claim 2 or 3. A rail extending in the circumferential direction at the bottom of the terminal box;
The connection ring is composed of a pair of halved ring bodies, and includes a circumferential groove in which the rail fits on the inner circumferential surface of each ring body,
The rail and the circumferential groove are aligned, and the half ring bodies are joined with a stopper to connect the connection ring to the terminal box.
The suspended explosion-proof illumination device according to any one of claims 1 to 4, wherein the suspension explosion-proof illumination device is provided. The flange includes a convex portion on the outer periphery,
The connection ring includes a recess in which the protrusion fits on the opening periphery of the bottom surface;
When the convex portion and the concave portion are aligned, the flange is fitted into the opening on the bottom surface of the connecting ring, and the connecting ring is rotated in the circumferential direction, the spiral groove that holds the convex portion of the flange is Prepared on the inner peripheral surface of the connecting ring,
The suspended explosion-proof illumination device according to any one of claims 1 to 5.

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