JP2020087568A - Attachment structure of housing, lighting device, and electric device - Google Patents

Abstract

To provide an attachment structure of a housing which is advantageous for inhibiting occurrence of electric corrosion.SOLUTION: An attachment structure 30 of a housing 20 has: an annular intermediate member 32 including a female screw area 32a which engages with a bolt 31 and a male screw area 32b having a second pitch P2 different from a first pitch P1 of the female screw area 32a; a first nut 34 having a through hole 34a, a cylindrical part 34b, and a female screw part 34c which engages with the male screw area 32b; a second nut 36; a first packing 33; and a second packing 35. An outer diameter D6 of the cylindrical part 34b is smaller than an opening diameter D1 of a fitting hole 20c. At least a part of the female screw part 34c of the first nut 34 overlaps with the cylindrical part 34b in a direction perpendicular to a center axis of the first nut 34. Materials of the first nut 34 and the housing 20 are the same type of metal which is dissimilar to materials of the bolt 31 or the second nut 36. A material of the intermediate member 32 is resin.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a housing mounting structure, a lighting fixture, and an electric device.

2. Description of the Related Art Conventionally, as an example of electric equipment, there is a lighting fixture installed on a wall portion of a building or the like. Such a luminaire generally has a flange portion fixed to the wall portion. The flange portion includes a housing that supports the luminaire main body. Here, although the housing may be directly attached to the wall portion, it is often attached to the wall portion via an attachment plate as an attached portion. At this time, the housing is mounted on the mounting plate by being supported by bolts protruding from the mounting plate and being fastened using nuts or the like. As a fastening device that can be used for mounting such a housing, Patent Document 1 discloses a fastening device that facilitates insertion of a shaft portion of a bolt by providing a resin packing on a part of a washer. is doing.

In general, bolts, nuts, or washers used when installing a lighting fixture in a building or the like are often made of stainless steel from the viewpoint of strength, corrosion resistance, and the like. On the other hand, the housing of a lighting fixture installed in a building or the like may be decorated according to the interior or exterior of the building or the like. In this case, the housing is often made of an aluminum alloy from the viewpoint of ease of processing and weight reduction.

Japanese Utility Model Publication No. 5-87320

For example, when the bolts, nuts, or washers included in the fastening device disclosed in Patent Document 1 are made of stainless steel, and the fastening device is used to attach the housing of the lighting fixture made of aluminum alloy to the wall portion. think of. In this case, the nut or washer fastened from the outside of the housing presses the surface of the housing. Further, in some cases, a part of the bolt may come into contact with the side surface of the mounting hole of the housing. That is, in such a mounting structure, a portion where different kinds of metal materials of stainless steel and aluminum alloy come into contact with each other occurs. At this time, if moisture such as rainwater infiltrates between the nut and the housing, the moisture also reaches a portion where different kinds of metal materials are in contact with each other, and electrolytic corrosion occurs due to the moisture. There is a risk.

The present disclosure has been made in view of such problems of the conventional technology. An object of the present disclosure is to provide a housing mounting structure, a lighting fixture, and an electric device that are advantageous for suppressing the occurrence of electrolytic corrosion.

In order to solve the above-mentioned problems, a mounting structure for a housing according to an aspect of the present disclosure is a structure for mounting a housing having a mounting hole to a mounted portion, and the structure is supported on the mounted portion side and has a mounting hole. An annular intermediate member including a bolt that penetrates, a female screw region that engages with the bolt, and a male screw region having a second pitch different from the first pitch of the female screw region, a through hole through which the bolt penetrates, and a bolt that enters A first nut having a cylindrical portion formed on the side and a female screw portion that engages with the male screw region of the intermediate member, a second nut that engages with the bolt, and an annular shape that contacts the housing and the first nut. It has a first packing and an annular second packing that comes into contact with the first nut and the second nut, the outer diameter of the cylindrical portion is smaller than the opening diameter of the mounting hole, and the female thread portion of the first nut is At least a part of the first nut and the casing overlap each other in the direction perpendicular to the central axis of the first nut, and the materials of the first nut and the casing are the same as each other and different from the material of the bolt or the second nut. It is a metal and the material of the intermediate member is a resin.

Further, a lighting fixture according to an aspect of the present disclosure includes a light source, a lighting fixture main body including the light source, a casing that supports the lighting fixture main body, a mounting portion for mounting the casing, and a mounting structure for the casing. , With.

Furthermore, an electric device according to an aspect of the present disclosure includes a housing, an attached portion to which the housing is attached, and the above-described housing attachment structure.

According to the present disclosure, it is possible to provide a housing mounting structure, a lighting fixture, and an electric device that are advantageous for suppressing the occurrence of electrolytic corrosion.

It is a figure which shows the structure of the lighting fixture which concerns on embodiment of this indication. It is a figure which shows the structure of the flange part in embodiment of this indication. It is a figure which shows the attachment structure of the housing|casing which concerns on embodiment of this indication.

Hereinafter, embodiments will be described in detail with reference to the drawings. In the following description, the vertical direction is defined as the Z direction as an example. Further, two directions perpendicular to each other in a plane perpendicular to the Z direction are defined as an X direction and a Y direction. In particular, the Y direction is a direction along the wall surface on which the lighting fixture illustrated below is installed.

FIG. 1 is a side view showing the configuration of the lighting fixture 10 according to the present embodiment. The lighting fixture 10 is installed, for example, on the wall portion 100 of a building or the like so that the light source 11 faces upward substantially corresponding to the side opposite to the Z direction. The installation location of the lighting fixture 10 may be outdoor or indoor. The lighting fixture 10 includes a light source 11, a lighting fixture main body 12, and a flange portion 13.

The light source 11 is, for example, an LED (light emitting diode) light bulb. The luminaire main body 12 includes a socket 16 for connecting the light source 11, and turns on the light source 11. The luminaire main body 12 includes a spherical bulb cover 17 that covers the entire light source 11 so as to cover the entire light source 11 in order to protect the light source 11 from wind and rain and to appropriately diffuse the light emitted from the light source 11. The bulb cover 17 is made of, for example, milky white acrylic. The luminaire main body 12 includes, for example, a pedestal portion 12a that supports the socket 16, the light bulb cover 17, and the like, and an arm portion that fixes the pedestal portion 12a on the upper surface of one end and connects the other end to the flange portion 13. 12b and may be included. The material of the base portion 12a and the arm portion 12b is metal, for example, aluminum alloy. The pedestal portion 12a and the arm portion 12b may be manufactured by a mold using an aluminum alloy as a material. Further, the pedestal portion 12a and the arm portion 12b may be variously decorated. Although not shown, the inside of the arm portion 12b includes a first space region S1 (see FIG. 2B) extending from the pedestal portion 12a to the flange portion 13. The electric wiring 19 connected to the socket 16 and a ground wire for preventing leakage (not shown) are routed to the wall portion 100 side through the first space region S1 (see FIG. 2B).

FIG. 2 is a diagram showing the configuration of the flange portion 13. FIG. 2A corresponds to the IIA-IIA cross section of FIG. 1. Specifically, FIG. 2A is a plan view of the flange portion 13 as seen from the lighting fixture body 12 side along the X direction. FIG. 2B corresponds to the IIB-IIB cross section of FIG. Specifically, FIG. 2B is a view in which the flange portion 13 and a part of the arm portion 12b are cut so as to pass through the center of the flange portion 13 in the plane.

The flange portion 13 is a unit for mounting the lighting fixture 10 on the wall portion 100. The flange portion 13 has a housing 20, a mounting plate 22, a spacer 23, and a mounting structure 30 for the housing 20.

The housing 20 has a shape in which the side facing the wall 100 is open. The material of the housing 20 is metal, for example, aluminum alloy. The housing 20 may be manufactured by using a mold made of an aluminum alloy. The housing 20 includes a flat plate portion 20a and side portions 20b.

The flat plate portion 20a faces the wall portion 100, and the arm portion 12b is connected thereto. The flat plate portion 20a has a circular shape with the center of gravity P of the housing 20 as a reference. However, the shape of the flat plate portion 20a may be a rectangle or another decorated shape. The shape of the side portion 20b is a cylinder having a width W along the X direction. However, the shape of the side portion 20b may be a modified irregular shape. The method of connecting the flat plate portion 20a and the arm portion 12b is not particularly limited, but welding is preferable in consideration of strength and waterproofness. Moreover, in order to improve airtightness or watertightness, caulking may be applied to the connecting portion.

Further, the flat plate portion 20a has a plurality of mounting holes 20c (see FIG. 3) through which a part of the mounting structure 30 penetrates. For example, two mounting holes 20c are provided at a distance of a radius R1 with respect to the center of gravity position P and symmetrically along the Z direction. However, the value of the radius R1 and the number of the mounting holes 20c installed can be changed as appropriate. Further, the flat plate portion 20a is formed with a through hole 20d through which the electric wiring 19 in the first space area S1 in the arm portion 12b is inserted to route the electric wire 19 in the second space area S2 in the housing 20. ing.

The attachment plate 22 is an attached portion to which the housing 20 is attached and which is attached to the wall portion in order to fix the flange portion 13 to the wall portion 100. The mounting plate 22 has a shape to be included in the housing 20. Since the flat plate portion 20a is circular, the mounting plate 22 can also be a circular plate. The material of the mounting plate 22 is metal, for example, stainless steel. The mounting plate 22 has the following three types of through holes, for example.

Although not shown, the first through hole is for fixing the mounting plate 22, and the wall side bolt 102 having the tip of the screw protruding from the wall portion 100 side is passed through. As an example, the mounting plate 22 has two such first through holes at a distance of a radius R2 with respect to the center of gravity P of the mounting plate 22 and symmetrically along the Y direction. In the present embodiment, for convenience, the center of gravity P of the housing 20 and the center of gravity P of the mounting plate 22 are lined up in the X direction, and the same reference numerals are given. The operator penetrates the wall-side bolt 102 through the first through hole and then fastens it using the nut 104 or the like, whereby the mounting plate 22 is mounted on the wall portion 100 side. In addition, when the lighting fixture 10 is installed on the wall portion 100, the wall-side bolt 102, the nut 104, and the like are present in the second space region S2 in the housing 20, and thus are not visually recognized from the outside.

The second through hole 22a is for fixing the housing 20, and penetrates a part of the mounting structure 30. As described above, the flat plate portion 20a of the housing 20 is similarly formed with the two mounting holes 20c that partially penetrate the mounting structure 30. Along with this, two second through holes are also provided at positions corresponding to these mounting holes 20c, that is, with the center of gravity P as a reference, at a distance of radius R1 and symmetrically along the Z direction.

The third through hole 22b allows the electric wiring 19 to penetrate from the flange portion 13 side to the wall portion 100 side. The third through hole 22b is formed, for example, in the central portion of the mounting plate 22.

The spacer 23 is a member that defines the position of the mounting plate 22 with respect to the housing 20. The spacer 23 is, for example, a stainless steel pipe. When the spacer 23 is such a metal tube, one open end of the spacer 23 contacts the back surface of the flat plate portion 20a of the housing 20, and the other open end contacts the surface of the mounting plate 22. That is, the mounting plate 22 is separated from the back surface of the flat plate portion 20a by the entire length of the spacer 23. Here, the overall length of the spacer 23 is such that, when the housing 20 is finally attached to the wall portion 100, the end portion of the side portion 20b of the housing 20 and the packing sheet 26 can prevent infiltration of water such as rainwater. It is specified so that contact can be made to a close degree. Further, when the housing 20 is finally attached to the wall portion 100, it is desirable that the housing 20 does not deform beyond the allowable range.

The spacer 23 is installed in accordance with each of the plurality of attachment structures 30, as shown in FIG. 2B, for example. The plurality of spacers 23 respectively penetrate the bolts 31 included in the corresponding mounting structure 30. With such a configuration, the spacer 23 is fixed to the housing 20 by being sandwiched between the back surface of the flat plate portion 20 a and the front surface of the mounting plate 22 with the fastening by the mounting structure 30.

FIG. 3 is a cross-sectional view showing the structure of the mounting structure 30. FIG. 3A shows a mounting structure 30 before combining the respective constituent elements. FIG. 3B shows the mounting structure 30 after combining the respective constituent elements. In this embodiment, there are two mounting structures 30 as shown in FIG. 2, and all the mounting structures 30 have the same configuration. Therefore, one mounting structure 30 will be exemplified below.

The mounting structure 30 is a structure for mounting the housing 20 on the mounting plate 22. The mounting structure 30 includes a bolt 31, an intermediate member 32, a first packing 33, a first nut 34, a second packing 35, and a second nut 36. Inside the housing 20, the bolt 31 is arranged such that the tip end portion faces the mounting hole 20c with the root portion supported by the wall portion 100 side. The axial direction of the bolt 31 in this state is parallel to the X direction, and is the mounting direction of each component included in the mounting structure 30. On the other hand, on the outside of the housing 20, the intermediate member 32, the first packing 33, the first nut 34, the second packing 35, and the second nut 36 are arranged in order from the side of the mounting hole 20c along the axial direction of the bolt 31. .. Here, the outer diameter of the threaded portion of the bolt 31 is defined as D0. The opening diameter of the mounting hole 20c is defined as D1. Further, the thickness of the flat plate portion 20a is defined as T1.

The bolt 31 is supported by the second through hole 22 a formed in the mounting plate 22. The length of the screw portion of the bolt 31 is longer than the width W of the side portion 20b of the housing 20. The threaded portion of the bolt 31 is inserted into the second through hole 22a from the wall portion 100 side. As shown in FIG. 2B, the head of the bolt 31 contacts the mounting plate 22 from the wall 100 side. Therefore, in the state where the bolt 31 is supported by the mounting plate 22, the threaded portion of the bolt 31 is in an upright posture from the mounting plate 22 toward the flat plate portion 20a.

The intermediate member 32 has an inner peripheral surface that is a female screw area 32a that engages with the threaded portion of the bolt 31, and an outer peripheral surface that is an annular male thread area 32b that has a second pitch P2 different from the first pitch P1 of the female screw area 32a. It is a member. Here, the outer diameter of the intermediate member 32 is defined as D2. Further, the thickness of the intermediate member 32 is defined as T2. As an example of the size of the intermediate member 32, when the size of the bolt 31 is M6 according to JIS standard and ISO standard, the size of the male screw region 32b may be M16. That is, in this case, the first pitch P1 has a pitch dimension that matches the M6 size. Further, the second pitch P2 has a pitch dimension that fits the M16 size.

The material of the intermediate member 32 is resin. Examples of the resin that can be used as the material of the intermediate member 32 include PC, PTFE, PEEK, PPS, and PP. Here, PC is an abbreviation for polycarbonate. PTFE is an abbreviation for polytetrafluoroethylene. PEEK is an abbreviation for polyetheretherketone. PPS is an abbreviation for polyphenylene sulfide. PP is an abbreviation for polypropylene.

The first packing 33 suppresses entry of water such as rainwater into the mounting hole 20c from between the surface of the flat plate portion 20a of the housing 20 and the first nut 34. The first packing 33 is, for example, an annular member made of an elastic member such as silicon. Here, the outer diameter of the first packing 33 is defined as D3. The outer diameter D3 is larger than the opening diameter D1 of the mounting hole 20c. Further, the inner diameter of the first packing 33 is defined as D4. The outer shape of the first packing 33 is not limited to the annular shape as long as it can prevent the infiltration of water.

The first nut 34 is a nut whose diagonal distance e is larger than the opening diameter D1 of the mounting hole 20c and whose thickness is defined as T3. However, the shape of the first nut 34 is not a general nut shape as a whole, and specifically, a shape that satisfies the following conditions.

First, the first nut 34 has a through hole 34a through which the bolt 31 passes. Here, the opening diameter of the through hole 34a is defined as D5. The opening diameter D5 is larger than the outer diameter D0 of the threaded portion of the bolt 31 and smaller than the outer diameter D2 of the intermediate member 32.

The first nut 34 has a cylindrical portion 34b on the side where the bolt 31 enters in the central axis direction. Here, the outer diameter of the cylindrical portion 34b is defined as D6. The outer diameter D6 is smaller than the opening diameter D1 of the mounting hole 20c. The inner diameter D4 of the first packing 33 is equal to the outer diameter D6. Further, the thickness of the cylindrical portion 34b is defined as T4. The thickness T4 is shorter than the thickness T3 of the first nut 34. The thickness T4 has a dimension such that at least a part of the side surface of the mounting hole 20c can contact the outer peripheral surface of the cylindrical portion 34b.

Further, the first nut 34 has a female screw portion 34c that engages with the male screw region 32b of the intermediate member 32 on the side where the bolt 31 enters in the central axis direction. Here, the depth of the female screw portion 34c is defined as T5. The depth T5 is shorter than the thickness T3 of the first nut 34. For example, the depth T5 may be equal to the thickness T2 of the intermediate member 32. Further, at least a part of the female screw portion 34c overlaps the cylindrical portion 34b in the direction perpendicular to the central axis of the first nut 34. Here, the direction perpendicular to the central axis of the first nut 34 means, for example, when the central axis is along the X direction, the direction toward either side on the YZ plane.

Further, the material of the first nut 34 is the same as the material of the housing 20. For example, when the material of the housing 20 is an aluminum alloy, it is desirable that the material of the first nut 34 is also an aluminum alloy of the same type. Here, “same type” means that aluminum alloys, for example, are aluminum-based alloys similar to each other, but strictly speaking, those having slightly different blended components may be included.

The second packing 35 suppresses intrusion of water such as rainwater into the bolt 31 from between the first nut 34 and the second nut 36. The second packing 35 is an annular member formed of an elastic member such as silicon. Here, the outer diameter of the second packing 35 is defined as D7. The outer diameter D7 may be equal to the diagonal distance of the second nut 36. Further, the inner diameter of the second packing 35 is defined as D8. The inner diameter D8 is larger than the outer diameter D0 of the threaded portion of the bolt 31. The inner diameter D8 in the present embodiment is, for example, equal to the opening diameter D5 of the through hole 34a of the first nut 34. Note that the outer shape of the second packing 35 is not limited to the annular shape as long as it can prevent the infiltration of water.

The second nut 36 engages with the tip portion of the bolt 31 that has passed through the through hole of the second packing 35. The second nut 36 is preferably a so-called cap nut in terms of appearance or from the viewpoint of suppressing corrosion and the like. The shape of the second nut 36 in the present embodiment is not a general shape having a dome-shaped covering portion, but a special shape having a flat covering portion is adopted as an example. The shape of the second nut 36 is not limited to such a special shape, and may be a decorated one. Further, the material of the second nut 36 is stainless steel, similar to a general nut.

Furthermore, the lighting fixture 10 has a packing sheet 26 that is interposed between the mounting plate 22 and the wall portion 100 when the flange portion 13 is mounted on the wall portion 100. The packing sheet 26 suppresses infiltration of moisture such as rainwater from the outside to the inside of the housing 20 through the gap between the housing 20 and the wall portion 100. The packing sheet 26 is made of, for example, an elastic member such as silicon. The outer diameter of the packing sheet 26 is larger than the outer diameter of the side portion 20b of the housing 20. The packing sheet 26 has, for example, the following three types of through holes.

The first through hole 26 a accommodates the heads of the plurality of bolts 31 supported by the mounting plate 22 when the packing sheet 26 and the mounting plate 22 are overlapped with each other. Therefore, the first through hole 26a is formed at a position adjacent to the second through hole 22a of the mounting plate 22 when the mounting plate 22 is in contact with the packing sheet 26. Since the first through hole 26a allows the head of the bolt 31 to be housed, the thickness T6 of the packing sheet 26 is set in consideration of the crushing margin when the flange portion 13 is attached to the wall portion 100, and It is desirable that the height is larger than the height of the head of 31.

Although not shown, the second through hole allows the wall-side bolt 102, from which the tip of the screw projects from the wall portion 100 side, to pass through for fixing the mounting plate 22. Therefore, the second through hole is formed at a position adjacent to the first through hole of the mounting plate 22 when the mounting plate 22 is in contact with the packing sheet 26.

The third through hole 26b allows the electric wiring 19 that has penetrated through the third through hole 22b of the mounting plate 22 to further penetrate to the wall portion 100 side. Therefore, the third through hole 26b is formed at a position adjacent to the third through hole 22b of the mounting plate 22 when the mounting plate 22 is in contact with the packing sheet 26.

Next, the installation of the lighting fixture 10 using the mounting structure 30 of the housing 20 will be described. Hereinafter, the luminaire main body 12 is assumed to be already assembled. Moreover, the housing 20 is assumed to be already connected to the arm portion 12b.

First, the operator supports the two bolts 31 on the mounting plate 22. Next, the worker attaches the mounting plate 22 to the wall portion 100 at an appropriate position on the wall portion 100 with the packing sheet 26 sandwiched between the wall surface of the wall portion 100 and the mounting plate 22. At this time, the operator uses the nut 104 or the like to insert the wall side bolt 102 protruding from the wall portion 100 through the second through hole of the packing sheet 26 and the first through hole of the mounting plate 22. To conclude. As a result, the attachment plate 22 is attached to the wall portion 100, and the two bolts 31 that are a part of the attachment structure 30 are in a state of protruding from the attachment plate 22 side. The operator engages the spacer 23 with each of the two protruding bolts 31.

Here, the worker holds the intermediate member 32 in the first nut 34 by engaging the female screw portion 34 c of the first nut 34 with the male screw region 32 b of the intermediate member 32 before the temporary installation of the housing 20. Let At the same time, the operator causes the first packing 33 to be held by the first nut 34 by causing the cylindrical portion 34b of the first nut 34 to pass through the through hole of the first packing 33.

Next, the worker inserts part of the threaded portions of all the bolts 31 into each of the two mounting holes 20c formed in the housing 20 to attach the housing 20 to the mounting plate 22. Temporarily install.

Next, the worker holds the first nut holding the intermediate member 32 and the first packing 33 from the side where the cylindrical portion 34b is formed in each of the screw portions of the bolt 31 protruding from the two mounting holes 20c. Engage 34. At this time, the portion that engages with the threaded portion of the bolt 31, that is, the portion that contacts the bolt 31, is the female thread region 32 a of the intermediate member 32. That is, the first nut 34 itself does not contact the bolt 31. Here, since the outer diameter D6 of the cylindrical portion 34b is smaller than the opening diameter D1 of the mounting hole 20c, when the worker continues the engaging work while rotating the first nut 34, at least a part of the cylindrical portion 34b is , Enters the inside of the mounting hole 20c. Since the outer diameter D3 of the first packing 33 is larger than the opening diameter D1 of the mounting hole 20c, the first nut 34 is finally placed at the position where the surface of the first packing 33 comes into contact with the surface of the housing 20. Stop.

Next, the operator inserts the second packing 35 into the through hole of the second packing 35 by inserting the tip of the threaded portion of the bolt 31 protruding from the through hole 34a of the first nut 34 into the through hole of the second packing 35. Engage with.

Then, the worker fastens all the second nuts 36 to the bolts 31, so that the housing 20 is firmly attached to the attachment plate 22. This completes the installation of the lighting fixture 10 on the wall portion 100.

Next, the operation and effect of the mounting structure 30 of the housing 20 and the lighting fixture 10 will be described.

First, the mounting structure 30 according to the present embodiment is a structure in which the housing 20 having the mounting holes 20c is mounted on a mounting plate 22, which is a mounted portion. The mounting structure 30 has bolts 31 that are supported on the mounted portion side and that penetrate the mounting holes 20c. The mounting structure 30 has an annular intermediate member 32 that includes a female screw region 32a that engages with the bolt 31, and a male screw region 32b having a second pitch P2 different from the first pitch P1 of the female screw region 32a. The mounting structure 30 includes a through hole 34a through which the bolt 31 penetrates, a cylindrical portion 34b formed on the side through which the bolt 31 enters, and a first nut 34 having a female screw portion 34c that engages with a male screw region 32b of the intermediate member 32. Have. Further, the mounting structure 30 includes a second nut 36 that engages with the bolt 31, an annular first packing 33 that contacts the housing 20 and the first nut 34, a first nut 34 and a second nut 36. And an annular second packing 35 in contact therewith. The outer diameter D6 of the cylindrical portion 34b is smaller than the opening diameter D1 of the mounting hole 20c. At least a part of the female screw portion 34c of the first nut 34 overlaps the cylindrical portion 34b in a direction perpendicular to the central axis of the first nut 34. The material of the first nut 34 and the housing 20 is the same kind of metal, and is a metal different from the material of the bolt 31 or the second nut 36. The material of the intermediate member 32 is resin.

Here, as a material that satisfies the above conditions, it is assumed that the material of the first nut 34 and the housing 20 is an aluminum alloy. On the other hand, the material of the bolt 31 or the second nut 36 is stainless steel.

First, according to the above configuration, in the mounting structure 30, the constituent elements that come into contact with the housing 20 or may come into contact with the housing 20 are the first packing 33 and the first nut 34. Here, since the outer diameter D6 of the cylindrical portion 34b is smaller than the opening diameter D1 of the mounting hole 20c, at least a part of the cylindrical portion 34b is inside the mounting hole 20c in the state where the mounting structure 30 is engaged. Get in. At this time, when the opening center of the mounting hole 20c is approximately on the central axis of the bolt 31, the mounting hole 20c does not contact the cylindrical portion 34b. On the other hand, when the housing 20 is, for example, decorated and manufactured by using a mold made of an aluminum alloy, the housing 20 faces downward in the vertical direction along the Z direction due to its own weight. There is a possibility that it will fall. Then, as shown in FIG. 3B, the housing 20 may come into contact with the cylindrical portion 34b in the vertical upper end region of the mounting hole 20c. However, in the present embodiment, the material of the first nut 34 is the same type of aluminum alloy as the material of the housing 20. In addition, the first packing 33 prevents the intrusion of moisture from the outside between the first nut 34 and the housing 20. Therefore, the occurrence of electrolytic corrosion is suppressed at the contact portion between the first nut 34 and the housing 20.

Further, according to the above configuration, the first nut 34 is supported by the bolt 31 via the resin intermediate member 32. Note that, among the bolts 31 penetrating the inside of the first nut 34, the portions that are not in contact with the female thread region 32a of the intermediate member 32 pass through the through holes 34a, so the metal portion of the first nut 34 and the bolts 31. Do not touch each other. On the other hand, the first nut 34 is finally fixed by fastening the second nut 36 to the bolt 31, but the second packing 35 is interposed between the first nut 34 and the second nut 36. That is, in the present embodiment, the first nut 34 does not contact the stainless steel bolt 31 and the second nut 36. Further, between the first nut 34 and the second nut 36, the infiltration of water from the outside is suppressed by the second packing 35. Therefore, the occurrence of electrolytic corrosion is suppressed between the first nut 34 and the bolt 31 or the second nut 36.

As described above, in the mounting structure 30, there is no portion where different metals, for example, aluminum alloy and stainless steel are in contact with each other. Therefore, as a result, the attachment structure 30 has a configuration in which a site where electrolytic corrosion may occur is excluded.

Therefore, according to the present embodiment, it is possible to provide the mounting structure 30 of the housing 20, which is advantageous in suppressing the occurrence of electrolytic corrosion.

Further, in the mounting structure 30, the housing 20 is fixed by fastening the one bolt 31 with the two nuts of the first nut 34 and the second nut 36. That is, the so-called double nut effect occurs in the fastening by the mounting structure 30. Therefore, according to the mounting structure 30, the looseness of the first nut 34 or the second nut 36 can be suppressed.

Further, the thickness T1 of the flat plate portion 20a of the housing 20 may be about 10 mm when the housing 20 is manufactured by a mold as described above. In this case, the cylindrical portion 34b may come into contact with the housing 20 by the thickness T1 of the flat plate portion 20a. Here, it is assumed that at least a part of the female screw portion 34c of the first nut 34 overlaps the cylindrical portion 34b in the direction perpendicular to the central axis of the first nut 34. At this time, immediately below the contact portion between the housing 20 and the cylindrical portion 34b, as shown in FIG. 3B, the engaging portion between the male screw region 32b of the intermediate member 32 and the female screw portion 34c of the first nut 34. Is located at least in part. Similarly, immediately below the contact portion between the housing 20 and the cylindrical portion 34b, at least a part of the engaging portion between the female screw region 32a of the intermediate member 32 and the screw portion of the bolt 31 is located. In other words, the weight of the housing 20 is applied to these engaging portions, which makes it difficult to rotate. Therefore, according to the mounting structure 30, the looseness of the first nut 34 or the second nut 36 can be suppressed.

Further, in the intermediate member 32, the first pitch P1 of the female screw region 32a and the second pitch P2 of the male screw region 32b are different from each other. That is, since the frequency of loosening is different for each pitch, it is possible to prevent loosening of the intermediate member 32 with respect to the bolt 31 and loosening of the first nut 34 with respect to the intermediate member 32 from occurring at the same time. Therefore, according to the mounting structure 30, loosening of the first nut 34 or the second nut 36 can be suppressed as a result.

In the above example, the material of the first nut 34 and the housing 20 is aluminum alloy, and the material of the bolt 31 and the second nut 36 is stainless steel. However, the present disclosure is not limited to these materials. In particular, a metal that can generate electrolytic corrosion under the condition that the materials of the first nut 34 and the housing 20 are the same as each other and different from the material of the bolt 31 or the second nut 36. Any material can be used.

Further, the lighting device 10 according to the present embodiment includes a light source 11, a lighting device body 12 including the light source 11, a housing 20 that supports the lighting equipment body 12, a mounting plate 22 that attaches the housing 20, and And a mounting structure 30 for the housing 20.

According to the luminaire 10 according to the present embodiment, it is possible to provide the luminaire 10 that can achieve the effect achieved by the mounting structure 30 described above.

In the above embodiment, the mounting structure 30 of the housing 20 is described as being used in the lighting fixture 10. However, the mounting structure of the present disclosure can also be adopted in an electric device having a housing and an attached portion to which the housing is attached. INDUSTRIAL APPLICABILITY The mounting structure according to the present disclosure can be particularly effective for general electric devices including a housing that needs to have a waterproof structure.

Although the preferred embodiment has been described above, the present embodiment is not limited to this, and various modifications and changes can be made within the scope of the gist thereof.

10 Lighting Equipment 20 Housing 20c Mounting Hole 22 Mounting Plate 30 Mounting Structure 31 Bolt 32 Intermediate Member 32a Female Threaded Area 32b Male Threaded Area 33 First Packing 34 First Nut 34a Through Hole 34b Cylindrical Section 34c Female Threaded Section 35 Second Packing 36 Second Nut D1 Mounting hole opening diameter D6 Cylindrical outer diameter P1 1st pitch P2 2nd pitch

Claims (5)

A structure in which a housing having a mounting hole is mounted on a mounting portion,
A bolt that is supported on the side of the mounted portion and that penetrates the mounting hole,
An annular intermediate member including a female screw region engaging with the bolt, and a male screw region having a second pitch different from the first pitch of the female screw region,
A first nut having a through hole through which the bolt penetrates, a cylindrical portion formed on the side where the bolt enters, and a female screw portion that engages with the male screw region of the intermediate member;
A second nut engaging the bolt,
An annular first packing that contacts the housing and the first nut;
An annular second packing that contacts the first nut and the second nut;
Have
The outer diameter of the cylindrical portion is smaller than the opening diameter of the mounting hole,
At least a part of the female screw portion of the first nut overlaps the cylindrical portion in a direction perpendicular to the central axis of the first nut,
The material of the first nut and the casing is the same kind of metal, and is a metal different from the material of the bolt or the second nut,
The material of the intermediate member is resin,
Mounting structure for the housing. The mounting structure for the housing according to claim 1, wherein a material of the first nut and the housing is an aluminum alloy. The mounting structure for the housing according to claim 1 or 2, wherein a material of the bolt or the second nut is stainless steel. A light source,
A lighting fixture body including the light source;
A housing that supports the lighting fixture body,
An attached portion to which the housing is attached,
A mounting structure for the housing according to any one of claims 1 to 3,
Lighting equipment having a. Housing and
An attached portion to which the housing is attached,
A mounting structure for the housing according to any one of claims 1 to 3,
Electrical equipment having.

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