Equipment mounting auxiliary parts

Abstract

To provide an auxiliary member for attaching an apparatus capable of attaching apparatuses with different sizes or shapes to a wall hole.SOLUTION: An auxiliary member 100 for attaching an apparatus comprises: a fixed pedestal 110 comprising a fixed portion fixed to a wall 11, a first covering portion 111 covering a part of a wall hole 12 so as to narrow the wall hole 12 in a state where the fixed portion is fixed to the wall 12, and a first opening portion 113 opening inside the first covering portion 111 as a first corresponding attachment hole; and a narrowing member 120 comprising an assembly portion 126 detachably assembled to the fixed pedestal 110, a second covering portion 121 covering a part of the first opening portion 113 so as to narrow the first opening portion 113 in a state where the assembly portion 126 is assembled to the fixed pedestal 110, and a second opening portion 123 opening inside the second covering portion 121 as a second corresponding attachment hole.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an instrument mounting assistance member for assisting the mounting of an instrument into a wall hole formed in a wall. [Background technology]

[0002] Generally, to attach a fixture such as a downlight to a wall hole in a ceiling material, the fixture is inserted into the wall hole, part of the fixture is placed in the space behind the wall (or above the ceiling), and the ceiling material is clamped in the thickness direction between the fixture's mounting hardware (e.g., a leaf spring) and part of the fixture (e.g., a flange), thereby attaching the fixture to the wall. However, there are a wide variety of shapes, thicknesses, materials, etc. of the walls around the wall hole. In order to attach the fixture to the wall more reliably, various fixture attachment auxiliary members are used to assist in attaching the fixture to the wall.

[0003] For example, Patent Document 1 discloses an auxiliary member for mounting an appliance to assist in mounting an appliance in a wall hole formed in a wall. In the following paragraphs, the reference number of Patent Document 1 is shown in parentheses. The auxiliary member for mounting (100) of Patent Document 1 has a through hole (101b) that communicates with a mounting hole (12) drilled in a ceiling material (11), a contact portion (102) that contacts the periphery of the mounting hole (12) from the back side of the ceiling material (101), a main body portion (101) having a thickness that allows it to be clamped together with the ceiling material (11) by a clamping portion (18) of a appliance (15), and an avoidance recess (108) recessed in a part of the contact portion (102) to avoid a protrusion (13) protruding from the back side of the ceiling material (11) when the contact portion (102) contacts the periphery of the mounting hole (12). The downlight fixture (15) is then inserted from the surface side of the ceiling material (11) toward the mounting hole (12) and the through hole (101b), whereby the downlight fixture (15) is attached to the mounting auxiliary member (100) and the ceiling material (11). Specifically, when the upper part of the fixture body (16) is inserted into the mounting hole (12), the elastic piece (18) is elastically deformed upward and inward, so that the fixture body (16) can pass through the mounting hole (12) without the elastic piece (18) abutting against the periphery of the mounting hole (12). When the fixture body (16) is inserted until the upper surface of the flange portion (17) of the downlight fixture (15) abuts against the surface of the ceiling material (11), the elastic piece (18) partially rotates downward and abuts against the receiving portion (103). At this time, the elastic piece (18) is still in an elastically deformed state, so that the elastic piece (18) urges the receiving portion (103) downward. In this manner, the ceiling material (11) and the mounting auxiliary member (100) are clamped between the elastic piece (18) and the flange portion (17), whereby the downlight fixture (15) can be installed in the mounting hole (12) of the ceiling material (11). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-212086 A Summary of the Invention [Problem to be solved by the invention]

[0005] The fixture mounting auxiliary member of Patent Document 1 is adapted to ceiling materials (walls) having various thicknesses and ridges, and is capable of mounting fixtures such as downlights to mounting holes (wall holes) in ceiling materials. However, the fixture mounting auxiliary member of Patent Document 1 can only mount fixtures that correspond to the opening diameter of the through hole, and the size of the fixture to be mounted is limited, which is a problem. In particular, with conventional fixture mounting auxiliary members, only fixtures of a standard that corresponds to the opening diameter of the through hole can be mounted on one fixture mounting auxiliary member, and in order to mount a fixture of a shape and size that deviates from the standard, a new fixture mounting auxiliary member corresponding to the shape and size is required. Therefore, when carrying out construction work, the builder must always prepare multiple types of fixture mounting auxiliary members to accommodate multiple sizes of fixtures, which makes management of the fixtures troublesome.

[0006] SUMMARY OF THE PRESENT EMBODIMENT It is an object of the present invention to provide an instrument mounting aid that allows instruments of different sizes or shapes to be mounted in an aperture in a wall. [Means for solving the problem]

[0007] The appliance mounting auxiliary member according to claim 1 is an appliance mounting auxiliary member that enables mounting of an appliance selected from an appliance group including at least a first appliance that can be mounted in a first corresponding mounting hole that is smaller than a wall hole provided in a wall, and a second appliance that can be mounted in a second corresponding mounting hole that is smaller than the first corresponding mounting hole, a fixing base including a fixing portion fixed to the wall, a first cover portion covering a part of the wall hole so as to reduce the size of the wall hole when the fixing portion is fixed to the wall, and a first opening portion opening as the first corresponding mounting hole on the inside of the first cover portion; a reduction member including an assembly portion that is detachably assembled to the fixed base, a second cover portion that covers a part of the first opening so as to reduce the first opening when the assembly portion is assembled to the fixed base, and a second opening that opens as the second corresponding mounting hole inside the second cover portion; The present invention is characterized by comprising:

[0008] The instrument mounting auxiliary member described in claim 2 is the instrument mounting auxiliary member described in claim 1, wherein the reduction member is configured to be assembled to the fixed base fixed to the wall by operation from the front side of the wall, and to be removable from the assembled state by operation from the front side of the wall.

[0009] The instrument mounting auxiliary member described in claim 3 is characterized in that, in the instrument mounting auxiliary member described in claim 1 or 2, the fixed base further includes an attachment portion on an inner periphery of the first opening, and the attachment portion of the reduction member is capable of forming and releasing a connection state between the attachment portion and the attachment portion by being inserted into the first opening and rotating relatively in the circumferential direction of the first opening.

[0010] The instrument mounting auxiliary member described in claim 4 is characterized in that, in the instrument mounting auxiliary member described in any one of claims 1 to 3, when the reduction member is assembled to the fixed base, movement of the reduction member in both the back direction and the front direction of the wall relative to the fixed base is restricted.

[0011] The instrument mounting auxiliary member according to claim 5 is the instrument mounting auxiliary member according to any one of claims 1 to 4, wherein the fixed base further comprises a hook portion extending so as to hook onto a peripheral edge of a front wall side of the wall hole outside the first cover portion, and a clamping body arranged behind the wall, movable toward the front wall side, and abutting against a peripheral edge of a rear wall side of the wall hole to clamp the wall in cooperation with the hook portion; The width of the inner periphery of the first opening in the wall front-rear direction is larger than the minimum wall thickness capable of mounting an instrument and smaller than the maximum wall thickness capable of mounting an instrument.

[0012] The tool mounting auxiliary member according to claim 6 is the tool mounting auxiliary member according to any one of claims 1 to 5, wherein the fixing portion includes a clamping means for clamping the wall in a front-rear direction to fix the fixing base to the wall, The clamping means includes a clamping body that moves in a wall front-rear direction to clamp the wall, a housing portion that houses the clamping body and has an insertion hole that opens on the wall front side, and a screw that is inserted into the housing portion through the insertion hole from the wall front side, is screwed into the clamping body, and drives the clamping body in the wall front-rear direction by a screw rotation operation from the wall front side, The screw may further include a decorative member that is attached to the fixed base and covers the screw and the insertion hole.

[0013] The instrument mounting auxiliary member according to claim 7 is the instrument mounting auxiliary member according to any one of claims 1 to 6, wherein the instrument group further includes a third instrument that is mountable to a third corresponding mounting hole that is smaller than the second corresponding mounting hole, the reduction member includes an adjustment member detachably attached to the inside of the second cover portion, The adjustment member is characterized by having a third cover portion that covers a portion of the second opening so as to reduce the second opening when assembled inside the second cover portion, and a third opening that opens inside the third cover portion as the third corresponding mounting hole.

[0014] The instrument mounting auxiliary member described in claim 8 is characterized in that, in the instrument mounting auxiliary member described in any one of claims 1 to 7, it further comprises a blocking member that is assembled to the fixed base or the reduction member and is capable of blocking an opening formed by the reduction member.

[0015] The instrument mounting auxiliary member described in claim 9 is an instrument mounting auxiliary member described in any one of claims 1 to 8, characterized in that the reduction member has a decorative portion configured to cover all or part of the portion of the fixed base exposed on the wall surface side when assembled to the fixed base.

[0016] The instrument mounting auxiliary member described in claim 10 is characterized in that, in the instrument mounting auxiliary member described in any one of claims 1 to 9, the reduction member includes a first reduction member forming a circular opening and a second reduction member forming a rectangular opening. Effect of the Invention

[0017] According to the invention described in claim 1, the tool mounting auxiliary member is configured to form a mounting hole for mounting a tool inside the wall hole by its opening. The tool mounting auxiliary member includes a fixed base having a first opening that opens as a first corresponding mounting hole of a first tool, and a reduction member that is detachably assembled to the fixed base and has a second opening that opens inside the first opening as a second corresponding mounting hole of a second tool. In this way, when the first tool is to be mounted on the wall, the tool mounting auxiliary member is installed in the wall hole with the reduction member removed from the fixed base, so that the first opening corresponding to the first corresponding mounting hole is formed inside the wall hole, and the first tool can be mounted on the first opening of the fixed base. On the other hand, when the second tool having a second corresponding mounting hole different from the first tool is to be mounted on the wall, the tool mounting auxiliary member is installed in the wall hole with the reduction member assembled to the fixed base, so that the second opening corresponding to the second corresponding mounting hole is formed inside the wall hole, and the second tool can be mounted on the second opening of the reduction member. Therefore, the instrument mounting auxiliary member of the present invention reduces the wall hole to a number of different sizes, thereby enabling both first and second instruments having different corresponding mounting holes to be mounted to the wall hole.

[0018] According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the reduction member is detachable from the fixed base fixed to the wall by an operation from the front side of the wall. As a result, even after the appliance mounting auxiliary member is installed on the wall, the mounting hole formed by the appliance mounting auxiliary member can be switched between the first opening and the second opening according to the corresponding mounting hole of the appliance by a simple operation from the front side of the wall.

[0019] According to the invention of claim 3, in addition to the effects of the invention of claim 1 or 2, the assembly part of the reduction member and the assembled part of the fixed base can be rotated relative to each other in the circumferential direction to form and release a coupled state of the assembly part and the assembled part. In other words, the reduction member and the fixed base can be assembled and separated by a simple operation of rotating the reduction member relative to the fixed base.

[0020] According to the invention described in claim 4, in addition to the effects of any one of the inventions of claims 1 to 3, the relative movement of the reducing member and the fixed base in the wall front-back direction is restricted when the reducing member and the fixed base are assembled, so that when the device is pushed into the mounting hole to mount it, the reducing member and the fixed base can be prevented from moving in the wall rear direction. In other words, the fixed base restricts the movement of the reducing member in the wall front-back direction, so that the fixed base can prevent the reducing member from moving in the wall rear direction.

[0021] According to the invention described in claim 5, in addition to the effects of any one of the inventions of claims 1 to 4, the hook of the fixing base engages with the peripheral edge of the wall of the wall hole, so that the fixing base can be positioned relative to the wall hole. The hook and the clamp work together to clamp the wall, so that the fixing base can be fixed to the wall hole. Furthermore, since the width of the inner peripheral part of the first opening in the wall front-rear direction (i.e., the thickness of the peripheral edge of the first opening) is larger than the minimum wall thickness at which an instrument can be attached and smaller than the maximum wall thickness at which an instrument can be attached, even if the actual wall thickness does not correspond to the attachment of the instrument, it is possible to attach the instrument by utilizing the flesh of the fixing base. Furthermore, if the actual wall thickness is larger than the maximum wall thickness at which an instrument can be attached, the flesh of the fixing base remains within the wall thickness of the wall hole and does not interfere with the attachment of the instrument.

[0022] According to the invention described in claim 6, in addition to the effects of any of the inventions of claims 1 to 5, it is possible to clamp the wall with the clamping body by screwing and rotating the screw from the surface of the wall. And, the decorative member covers and hides the screw and its insertion hole, so that the deterioration of the aesthetic appearance caused by the screw and the insertion hole can be suppressed.

[0023] According to the invention of claim 7, in addition to the effects of any one of the inventions of claims 1 to 6, the reduction member is provided with an adjustment member having a third opening corresponding to the third corresponding mounting hole, so that in addition to the first and second instruments, a third instrument having an even smaller third corresponding mounting hole can also be attached to the wall hole. That is, the instrument attachment auxiliary member of the present invention enables an instrument arbitrarily selected from an instrument group including a first instrument attachable to a first corresponding mounting hole smaller than the wall hole, a second instrument attachable to a second corresponding mounting hole smaller than the first corresponding mounting hole, and a third instrument attachable to a third corresponding mounting hole smaller than the second corresponding mounting hole to be attached to the wall hole.

[0024] According to the invention described in claim 8, in addition to the effects of any of the inventions of claims 1 to 7, by assembling a blocking member to the fixed base or the reduction member, when the fixture is not attached or when the fixture is removed, the blocking member blocks the opening so that the back space of the wall does not face the surface of the wall through the opening serving as the mounting hole, thereby preventing the overall aesthetic appearance of the wall from being marred. Furthermore, the fixture mounting auxiliary member in the assembled state in which the opening is blocked by the blocking member can also be used as a member for blocking the wall hole after the fixture has been removed.

[0025] According to the invention described in claim 9, in addition to the effects of any of the inventions of claims 1 to 8, the reduction member is provided with a decorative portion that covers all or part of the exposed portion of the fixed base on the wall surface, thereby making it possible to suppress a decrease in the aesthetic appearance of the entire wall due to the exposure of the fixed base without increasing the number of parts.

[0026] According to the invention described in claim 10, in addition to the effects of any one of the inventions of claims 1 to 9, either a first reducing member forming a circular opening or a second reducing member forming a rectangular opening can be selected and assembled to the fixed base. As a result, the instrument mounting auxiliary member of the present invention enables an instrument to be mounted in a wall hole regardless of whether the corresponding mounting hole of the instrument is circular (round) or rectangular (square). [Brief description of the drawings]

[0027] [Figure 1] 1A is a schematic perspective view of an instrument mounting auxiliary member according to one embodiment of the present invention, and FIG. 1B is a schematic perspective view of the instrument mounting auxiliary member as viewed from above and below. [Diagram 2] 2A is a plan view, a bottom view, a front view, and a side view of the instrument mounting support member of FIG. 1 ; [Diagram 3] 3A is a cross-sectional view taken along line AA of the instrument mounting auxiliary member in FIG. 2 , and FIG. 3B is a cross-sectional view taken along line BB of the instrument mounting auxiliary member in FIG. 2 . [Figure 4] 3 is a cross-sectional view taken along CC of the auxiliary member for mounting the instrument in FIG. 2 . [Diagram 5] FIG. 2 is an exploded perspective view of the instrument mounting auxiliary member of FIG. 1; [Figure 6] 6A is a schematic perspective view of the fixing base of the instrument mounting auxiliary member of FIG. 5 as viewed from above, and FIG. 6B is a schematic perspective view of the fixing base of the instrument mounting auxiliary member of FIG. 5 as viewed from below. [Figure 7] (a) Plan view, (b) bottom view, (c) front view, (d) side view, and (e) DD cross-sectional view of the fixed base in Fig. 6 . [Figure 8] 7A is a schematic perspective view of a reduction member (main body, without adjustment member) of the instrument mounting auxiliary member of FIG. 6, and FIG. 7B is a schematic perspective view of the reduction member (main body, without adjustment member) of the instrument mounting auxiliary member of FIG. 6, as viewed from above. FIG. [Figure 9] (a) Plan view, (b) bottom view, (c) front view, (d) side view, and (e) E-E cross-sectional view of the reduced member in FIG. 8 . [Figure 10] 6A and 6B are schematic perspective views of an adjustment member (without a main body and a blocking member) of the instrument mounting auxiliary member of FIG. 5, respectively, as viewed from above and below. [Figure 11] 11A to 11E are (a) plan view, (b) bottom view, (c) front view, (d) side view, and (e) FF cross-sectional view of the adjustment member of FIG. 10 . [Figure 12] 6A and 6B are schematic perspective views of the closing member of the instrument mounting auxiliary member of FIG. 5, respectively, as viewed from above and below. [Figure 13] 13A to 13E are (a) plan view, (b) bottom view, (c) front view, (d) side view, and (e) G-G cross-sectional view of the closure member of FIG. 12 . [Figure 14]6A is a schematic perspective view of the decorative member of the appliance mounting auxiliary member of FIG. 5, and FIG. 6B is a schematic perspective view of the decorative member of the appliance mounting auxiliary member of FIG. 5, as viewed from above. [Figure 15] 15A to 15E are (a) plan view, (b) bottom view, (c) front view, (d) side view, and (e) HH cross-sectional view of the decorative member of FIG. 14 . [Figure 16] 1 is a schematic perspective view of an attachment structure of an instrument attachment auxiliary member according to one embodiment of the present invention; [Figure 17] 3A to 3C are schematic cross-sectional views showing cross-sectional views of the mounting structure of the tool mounting auxiliary member on which first to third tools are installed in one embodiment of the present invention. [Figure 18] 1 is a schematic cross-sectional view showing a cross-sectional view of a mounting structure of an instrument mounting auxiliary member with a mounting hole blocked in one embodiment of the present invention; FIG. [Figure 19] 13 is a schematic perspective view showing a step of a method for constructing a mounting structure for an instrument mounting auxiliary member of one embodiment of the present invention, illustrating a step of inserting the instrument mounting auxiliary member into a wall hole. FIG. [Figure 20] 1A is a schematic cross-sectional view showing a step of a method for constructing a mounting structure for an instrument mounting auxiliary member of one embodiment of the present invention, and showing (a) a step of placing the instrument mounting auxiliary member against a wall and rotating the clamping body, and (b) a step of driving the clamping body closer to the wall. [Figure 21] FIG. 1 is a schematic cross-sectional view showing (a) a step of forming a mounting hole corresponding to a first corresponding mounting hole, (b) a step of forming a mounting hole corresponding to a second corresponding mounting hole, and (c) a step of forming a mounting hole corresponding to a third corresponding mounting hole in the mounting structure of an appliance mounting auxiliary member of one embodiment of the present invention. [Figure 22] FIG. 13 is an exploded perspective view of an instrument mounting auxiliary member according to another embodiment of the present invention. [Figure 23] FIG. 13 is an exploded perspective view of an instrument mounting auxiliary member according to another embodiment of the present invention. [Figure 24] FIG. 13 is an exploded perspective view of an instrument mounting auxiliary member and an instrument according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the shapes of the figures referred to in the following description are conceptual or schematic diagrams for explaining preferred shapes and dimensions, and the dimensional ratios do not necessarily match the actual dimensional ratios. In other words, the present invention is not limited to the dimensional ratios in the drawings.

[0029] The fixture mounting auxiliary member 100 according to one embodiment of the present invention is configured to assist in mounting a fixture in a wall hole drilled in a wall. More specifically, the fixture mounting auxiliary member 100 assists in selecting and mounting one fixture from a group of multiple types of fixtures in a wall hole 12 drilled in a wall 11 such as a ceiling. Here, the fixture is exemplified as a downlight. However, the fixture may be other fixtures such as a switch, a speaker, or a ventilation fan. The group of instruments includes a first instrument 15 (see FIG. 17(a)), which is attachable to a first corresponding mounting hole smaller than the wall hole 12; a second instrument 15' (see FIG. 17(b)), which is attachable to a second corresponding mounting hole smaller than the first corresponding mounting hole; and a third instrument 15" (see FIG. 17(c)), which is attachable to a third corresponding mounting hole smaller than the second corresponding mounting hole. Here, each corresponding mounting hole is defined as a mounting hole having a predetermined range of diameter or size, which has a maximum diameter and a minimum diameter that allow each instrument to be attached. In this embodiment, the instrument mounting auxiliary member 100 is fixed to the wall hole 12 of the wall 11, and a structure in which instruments can be installed or have been installed is referred to as the mounting structure 10. Note that, in this embodiment, the wall hole 12 is a circular through hole, but it may be of another shape, such as a square. Furthermore, when the invention is carried out by combining the instrument mounting auxiliary member 100 with one or all of the instrument group consisting of multiple types of instruments, the combination is referred to as an instrument device.

[0030] 1(a) and (b) are a perspective view from above and a perspective view from below of an instrument mounting auxiliary member 100 according to one embodiment. Figs. 2(a) to (d) are a plan view, a front view, a side view and a bottom view of the instrument mounting auxiliary member 100. Figs. 3 and 4 are AA, BB and CC cross-sectional views of the instrument mounting auxiliary member 100. Fig. 5 is an exploded perspective view of the instrument mounting auxiliary member 100.

[0031] As shown in Figs. 1 to 5, the tool mounting auxiliary member 100 is a disk-shaped member in plan view formed by combining a plurality of members. The tool mounting auxiliary member 100 has a rear surface facing the space behind the wall as shown in the plan view of Fig. 2(a) and a front surface facing the space on the wall surface as shown in the bottom view of Fig. 2(b). The tool mounting auxiliary member 100 forms mounting holes of different sizes according to the size (standard) of the corresponding mounting hole of the tool, and enables the tool to be mounted and removed from the mounting hole from the front. As shown in Fig. 5, the tool mounting auxiliary member 100 includes a fixed base 110, a reduction member 120, an adjustment member 130, a blocking member 140, and a decorative member 150. Here, the adjustment member 130 and the blocking member 140 are assembled to the adjustment member 130 so as to adjust or block the size of the opening of the reduction member 120, and can be interpreted as part of the configuration of the adjustment member 130. Each member will be described below.

[0032] The fixed base 110 will be described with reference to Fig. 6 and Fig. 7. Fig. 6 is a perspective view of the fixed base 110 as viewed from above and below. Figs. 7(a) to (e) are a plan view, a bottom view, a front view, a side view, and a DD cross-sectional view of the fixed base 110.

[0033] The fixed base 110 has an annular shape with a front surface facing the front side of the wall and a rear surface facing the rear side of the wall. The fixed base 110 is configured to be fixed to the wall 11 (the periphery of the wall hole 12) with a part of the fixed base 110 disposed inside the wall hole 12 formed in the wall 11, thereby reducing the wall hole 12 to a size corresponding to the first corresponding mounting hole (smaller than the wall hole 12) of the first device 15. In other words, the fixed base 110 forms a mounting hole corresponding to the first corresponding mounting hole of the first device 15 inside the wall hole 12.

[0034] More specifically, the fixed base 110 has a fixing portion for fixing to the periphery of the wall hole 12 in the wall 11, a first covering portion 111 that covers a portion of the wall hole 12 so as to reduce the size of the wall hole 12 when the fixing portion is fixed to the wall 11, and a first opening 113 that opens inside the first covering portion 111 as a first corresponding mounting hole.

[0035] The first cover portion 111 is a portion extending in an annular belt shape with a predetermined width, and is configured to cover the outer peripheral portion of the wall hole 12 (i.e., within a range of a predetermined distance in the radial direction from the outer peripheral edge) over the entire circumferential direction. The outer diameter of the first cover portion 111 is approximately equal to the inner diameter of the wall hole 12, and the inner diameter is set within the range of the diameter of the first corresponding mounting hole (between the maximum diameter and the minimum diameter) so as to correspond to the first corresponding mounting hole. As a result, the first opening 113 can function as the first corresponding mounting hole of the first device 15. In addition, a press-fitted portion 119 for assembling the decorative member 150 is provided on the front surface of the first cover portion 111 facing the wall surface side. The press-fitted portion 119 is provided at three locations at equal intervals in the circumferential direction of the first inner peripheral portion 112. The press-fitted portion 119 is a round hole formed to press-fit the pin-shaped press-fitted protrusion 152 of the decorative member 150.

[0036] A first inner peripheral portion 112 is provided on the inner peripheral side of the first cover portion 111. The first inner peripheral portion 112 is formed as a circular convex stripe that is convexly provided on the rear surface of the first cover portion 111. The first inner peripheral portion 112 has an inner peripheral surface that faces the radial center and extends in the wall front-rear direction with a predetermined width (thickness between the front surface and the rear surface). The width of the first inner peripheral portion 112 in the wall front-rear direction forms the thickness of the periphery of the first opening 113. The first device 15 can be attached to the mounting hole by clamping the periphery of this first opening 113 (see FIG. 17(a)). The width of the first inner peripheral portion 112 in the wall front-rear direction of the first opening 113 is determined to be larger than the minimum wall thickness at which the first device 15 can be attached and smaller than the maximum wall thickness at which the first device 15 can be attached.

[0037] A first outer peripheral portion 114 is provided on the outer peripheral side of the first cover portion 111. The first outer peripheral portion 114 is formed as a circular convex stripe that is provided on the rear surface of the first cover portion 111. The first outer peripheral portion 114 faces radially outward and has an outer peripheral surface that extends in the wall front-rear direction with a predetermined width (thickness between the front surface and the rear surface). In this embodiment, the width of the outer peripheral surface (height of the convex stripe) is smaller than the width of the inner peripheral surface (height of the convex stripe). In addition, it is preferable that the outer diameter of the first outer peripheral portion 114 is approximately equal to the inner diameter of the wall hole 12 so that the outer peripheral surface of the first outer peripheral portion 114 comes into sliding contact with the inner peripheral surface of the wall hole 12 when the fixing base 110 is fixed to the wall hole 12. A flange 114a extending radially outward is provided on the outer periphery of the front side of the first outer peripheral portion 114. When the fixed base 110 is fixed to the wall hole 12, the flange 114a extends outside the wall hole 12 and can function as a hanging portion that abuts against the wall surface and is hung.

[0038] The fixed base 110 also includes an assembly receiving portion 115 on the inner circumferential surface of the first inner circumferential portion 112 so as to face the inside of the first opening 113. The assembly receiving portions 115 are provided at three locations at equal intervals in the circumferential direction of the first inner circumferential portion 112. Each assembly receiving portion 115 is located radially inside the press-fit portion 119. The assembly receiving portion 115 is configured to detachably assemble the assembly portion 126 of the reduction member 120. In other words, the assembly receiving portion 115 and the assembly portion 126 are assembly means for detachably assembling the fixed base 110 and the reduction member 120. The fixed base 110 and the reduction member 120 are configured to be able to form and release a coupled state of the assembly portion 126 and the assembly receiving portion 115 by relatively rotating in the circumferential direction of the first opening 113 with the reduction member 120 inserted into the first opening 113. More specifically, the mounting portion 115 is formed as an L-shaped groove recessed in the inner peripheral surface of the first inner peripheral portion 112. The mounting portion 115 includes an introduction passage 115a that is open to the front side and extends in the wall front-rear direction, and a communication passage 115b that bends in an L-shape from the introduction passage 115a on the rear side and extends in the circumferential direction. The introduction passage 115a has a width that allows the mounting portion 126 to enter from the wall front side. In addition, a restriction wall 115c is provided so as to close the front side of the communication passage 115b. The restriction wall 115c is provided with a locking claw 115d that protrudes from the restriction wall 115c toward the communication passage 115b at a position adjacent to the introduction passage 115a. The locking claw 115d functions as a return stopper that locks the assembly portion 126 with a certain degree of force after the assembly portion 126 has moved over the locking claw 115d and into the communication passage 115b.

[0039] The fixed base 110 includes a clamping means as a fixing portion for clamping the wall in the front-rear direction in cooperation with the flange 114a to fix the fixed base 110 to the wall 11. The clamping means includes a clamping body 118 that moves in the wall front-rear direction to clamp the periphery of the wall hole 12, a storage section 117a that stores the clamping body 118 and has an insertion hole that opens on the wall front side, and a screw 117b that is inserted into the storage section 117a from the wall front side via the insertion hole, is screwed into the clamping body 118, and drives the clamping body 118 in the wall front-rear direction by a screw rotation operation from the wall front side.

[0040] More specifically, the erected portion 117 erects from the rear surface of the first cover portion 111 of the fixed base 110 (as a part of the clamping means). The erected portion 117 is provided at two locations facing each other across the center. As shown in FIG. 3(b), the erected portion 117 is formed as a hollow rectangular column and is configured to movably hold the clamping body 118 in the wall front-rear direction. The erected portion 117 includes a housing portion 117a that houses a part of the clamping body 118, and a screw 117b housed in the housing portion 117a. An insertion hole is drilled in the surface of the erected portion 117 on the wall front side, and the screw 117b is housed in the housing portion 117a through the insertion hole. The head of the screw 117b is exposed on the front side of the first cover portion 111 so as to enable a screw-rotating operation from the wall front side. The shaft of the screw 117b is held in the receiving portion 117a so as to rotate in place without being threaded forward or backward in the axial direction.

[0041] The base end of the clamping body 118 is screwed onto the shaft of the screw 117b (as a part of the clamping means). The clamping body 118 has a tip portion as a clamping part, and is configured to clamp the wall 11 in cooperation with the flange 114a. That is, each clamping body 118 has a shape that protrudes radially outward from the first outer circumferential part 114. The clamping body 118 can be moved in the wall front-rear direction by rotating the screw 117b from the front side of the first cover part 111. A slit 117c is formed on the top side surface of the wall rear side of the erected part 117. The clamping body 118 can be rotated within a range of about 90 degrees around the shaft of the screw 117b via the slit 117c. When the clamping body 118 is in a position retracted to the back side of the wall, the tip portion of the clamping body 118 can be displaced between a first position protruding radially outward and a second position protruding circumferentially (see FIG. 19). In the first position, the clamping body 118 can move toward the front side of the wall by operating the screw 117b, and can move toward and away from the flange 114a (which is a part of the clamping means). On the other hand, in the second position, the clamping body 118 cannot move toward the front side of the wall by operating the screw 117b. This second position is selected in the process of inserting a part of the fixed base 110 (the first inner peripheral portion 112 and the first outer peripheral portion 114) into the wall hole 12, and prevents the clamping body 118 from interfering with the wall surface.

[0042] The clamping means is provided at a plurality of locations on the side of the fixed base 110 facing the back of the wall, and all of them are formed so as to be insertable into the wall hole 12. Furthermore, the first outer periphery 114 is annular and surrounds the entire clamping means, and is formed as a convex strip that engages with the inner surface of the wall hole 12. The first outer periphery 114 (convex strip) does not protrude further toward the back of the wall (rear side) than the first inner periphery 112. Therefore, when a leaf spring type fixture (downlight) is installed, the leaf spring does not get in the way when it abuts against the wall material or the rear surface of the fixture installation auxiliary member 100 to clamp it. However, the present invention is not limited to this embodiment, and the height of the convex strip of the first outer periphery 114 may be the same as the height of the convex strip of the first inner periphery 112. Alternatively, the height of the convex strip of the first outer periphery 114 may be greater than the height of the convex strip of the first inner periphery 112 as long as it does not impede the installation of the fixture.

[0043] The reduction member 120 will be described with reference to Fig. 8 and Fig. 9. Fig. 8 is a perspective view of the reduction member 120 as seen from above and below. Figs. 9(a) to (e) are a plan view, a bottom view, a front view, a side view, and an E-E cross-sectional view of the reduction member 120.

[0044] The reduction member (or reduction member body) 120 has an annular shape with a front surface facing the front side of the wall and a rear surface facing the rear side of the wall. The reduction member 120 is configured to reduce the wall hole 12 and the first opening 113 to a size corresponding to the second corresponding mounting hole (smaller than the first corresponding mounting hole) of the second device 15' when assembled to the fixed base 110. In other words, the reduction member 120 forms a mounting hole corresponding to the second corresponding mounting hole of the second device 15' inside the wall hole 12 and the first opening 113. Although shown separately for convenience of explanation, the reduction member 120 is provided with the adjustment member 130 and the blocking member 140 in a detachable manner.

[0045] More specifically, the reduction member 120 includes an assembly portion 126 that is removably assembled to the mounting portion 115 of the fixed base 110, a second cover portion 121 that covers a portion of the first opening 113 so as to reduce the first opening 113 when the assembly portion 126 is assembled to the mounting portion 115, and a second opening 123 that opens inside the second cover portion 121 as a second corresponding mounting hole.

[0046] The second cover portion 121 is a portion extending in an annular belt shape with a predetermined width, and is configured to cover the outer peripheral portion of the first opening 113 over the entire circumferential direction. The outer diameter of the second cover portion 121 is almost the same as the inner diameter of the first opening 113, and the inner diameter is set within the range of the diameter of the second corresponding mounting hole (between the maximum diameter and the minimum diameter) so as to correspond to the second corresponding mounting hole (smaller than the first corresponding mounting hole). This allows the second opening 123 to function as the second corresponding mounting hole of the second device 15'. In addition, the front surface of the second cover portion 121 facing the wall surface side is provided with an indicator portion 121a, which is a mark for circumferential positioning. During assembly, the relative position of the reduction member 120 to the fixed base 110 in the circumferential direction can be determined using the indicator portion 121a as a guide.

[0047] A second inner peripheral portion 122 is provided on the inner peripheral side of the second cover portion 121. The second inner peripheral portion 122 is formed as a circular protrusion provided on the rear surface of the second cover portion 121. The second inner peripheral portion 122 has an inner peripheral surface that faces the radial center and extends in the wall front-rear direction with a predetermined width (thickness between the front surface and the rear surface). The width of the second inner peripheral portion 122 in the wall front-rear direction forms the thickness of the periphery of the second opening 123. The second device 15' can be attached to the mounting hole by clamping the periphery of this second opening 123 (see FIG. 17(b)). The width of the second inner peripheral portion 122 in the wall front-rear direction of the second opening 123 is set to be larger than the minimum wall thickness at which the second device 15' can be attached and smaller than the maximum wall thickness at which the second device 15' can be attached. Furthermore, a step portion 122a that is recessed in a stepped shape over the entire circumferential direction is provided on the inner peripheral edge of the front surface of the second inner peripheral portion 122. The step portion 122a is configured to accommodate a flange 134a of the adjustment member 130 described later.

[0048] On the outer peripheral side of the second covering portion 121, a second outer peripheral portion 124 is provided. The second outer peripheral portion 124 is formed as an annular convex rib protruding from the rear surface of the second covering portion 121. The second outer peripheral portion 124 faces the outer side in the radial direction and has an outer peripheral surface extending in the front-back direction of the wall with a predetermined width (the thickness between the front surface and the rear surface). In the present embodiment, the width of the outer peripheral surface is the same as the width of the inner peripheral surface. Further, when the reducing member 120 is assembled to the fixed pedestal 110, the outer diameter of the second outer peripheral portion 124 preferably substantially coincides with the inner diameter of the first opening portion 113 so that the outer peripheral surface of the second outer peripheral portion 124 is in sliding contact with the inner peripheral surface of the first inner peripheral portion 112. And on the outer periphery on the front surface side of the second outer peripheral portion 124, a flange 124a extending outward in the radial direction is provided. The flange 124a is disposed on a stepped portion 153 of a decorative member 150 described later and is configured to engage with the front surface of the decorative portion 151 (or the stepped portion 153).

[0049] The assembling portion 126 of the reducing member 120 is formed so as to protrude outward in the radial direction from the end portion on the rear surface side of the second outer peripheral portion 124. The assembling portions 126 are provided at three positions at equal intervals in the circumferential direction of the second outer peripheral portion 124. The assembling portion 126 is a rectangular protrusion extending in the circumferential direction with a predetermined length. And the assembling portion 126 is configured to enter from the introduction path 115a of the assembled portion 115, cross over the locking claw 115d in the circumferential direction, and move to the communication path 115b. Further, since one corner portion in the circumferential direction of the assembling portion 126 is chamfered, the movement from the introduction path 115a to the communication path 115b (crossing over the locking claw 115d) is guided. On the other hand, since the other corner portion in the circumferential direction of the assembling portion 126 is not chamfered, the assembling portion 126 is locked by the locking claw 115d, and the movement from the communication path 115b to the introduction path 115a (crossing over the locking claw 115d) is relatively difficult.

[0050] The reduction member 120 also includes an attachment portion 125 on the inner circumferential surface of the second inner circumferential portion 122 so as to face the inside of the second opening 123. The attachment portions 125 are provided at three locations at equal intervals in the circumferential direction of the second inner circumferential portion 122. The attachment portions 125 (introduction passages 125a) are located radially inside the attachment portion 126. The attachment portion 125 is configured to detachably attach the attachment portion 136 of the adjustment member 130. In other words, the attachment portion 125 and the attachment portion 136 are a second attachment means for detachably attaching the reduction member 120 and the adjustment member 130. The reduction member 120 and the adjustment member 130 are configured to be able to form and release a coupled state of the attachment portion 136 and the attachment portion 125 by relatively rotating in the circumferential direction of the second opening 123 with the adjustment member 130 inserted into the second opening 123. More specifically, the mounting portion 125 is formed as an L-shaped groove recessed in the inner peripheral surface of the second inner peripheral portion 122. The mounting portion 125 includes an introduction passage 125a that opens to the front side and extends in the wall front-rear direction, and a communication passage 125b that bends in an L-shape from the introduction passage 125a on the rear side and extends in the circumferential direction. The introduction passage 125a has a width that allows the mounting portion 136 to enter from the wall front side. In addition, a restriction wall 125c is provided so as to close the front side of the communication passage 125b. The restriction wall 125c is provided with a locking claw 125d that protrudes from the restriction wall 125c toward the communication passage 125b at a position adjacent to the introduction passage 125a. The locking claw 125d functions as a return stopper that locks the assembly portion 136 with a certain degree of force after the assembly portion 136 has moved over the locking claw 125d and into the communication passage 125b.

[0051] The adjustment member 130 will be described with reference to Fig. 10 and Fig. 11. Fig. 10 is a perspective view of the adjustment member 130 as seen from above and below. Figs. 11(a) to (e) are a plan view, a bottom view, a front view, a side view, and an F-F cross-sectional view of the adjustment member 130.

[0052] The adjustment member 130 has an annular shape having a front surface facing the front side of the wall and a rear surface facing the rear side of the wall. When assembled to the reduction member 120, the adjustment member 130 is configured to reduce the wall hole 12 and the second opening 123 to a size corresponding to a third corresponding mounting hole (smaller than the second corresponding mounting hole) of the third device 15". In other words, the adjustment member 130 forms mounting holes corresponding to the third corresponding mounting hole of the third device 15" inside the wall hole 12 and the second opening 123. Although shown separately for convenience of explanation, the adjustment member 130 is a part of the reduction member 120 and includes a blocking member 140.

[0053] More specifically, the adjustment member 130 includes an assembly portion 136 that is removably assembled to the assembly receiving portion 125 of the reduction member 120, a third cover portion 131 that covers a portion of the second opening 123 so as to reduce the second opening 123 when the assembly portion 136 is assembled to the assembly receiving portion 125, and a third opening 133 that opens inside the third cover portion 131 as a third corresponding mounting hole.

[0054] The third cover portion 131 is a portion extending in an annular band shape with a predetermined width, and is configured to cover the outer peripheral portion of the second opening 123 over the entire circumferential direction. The outer diameter of this third cover portion 131 approximately matches the inner diameter of the second opening 123, and the inner diameter is set within the range of the diameter of the third corresponding mounting hole (between the maximum diameter and the minimum diameter) so as to correspond to the third corresponding mounting hole (which is smaller than the second corresponding mounting hole). This allows the third opening 133 to function as the third corresponding mounting hole of the third appliance 15".

[0055] A third inner peripheral portion 132 is provided on the inner peripheral side of the third cover portion 131. The third inner peripheral portion 132 is formed as a circular protrusion provided on the rear surface of the third cover portion 131. The third inner peripheral portion 132 faces the radial center and has an inner peripheral surface extending in the wall front-rear direction with a predetermined width (thickness between the front surface and the rear surface). The width of the third inner peripheral portion 132 in the wall front-rear direction forms the thickness of the periphery of the third opening 133. The third device 15" can be attached to the mounting hole by clamping the peripheral edge of this third opening 133 (see Figure 17 (c)). The width in the wall front-to-back direction of the third inner circumferential portion 132 of the third opening 133 is set to be greater than the minimum wall thickness at which the third device 15" can be attached, and smaller than the maximum wall thickness at which the third device 15" can be attached. Furthermore, a step portion 132a is provided on the inner peripheral edge of the front surface of the third inner circumferential portion 132, which is recessed in a stepped shape over the entire circumferential direction. The step portion 132a is configured to accommodate the outer peripheral edge of the blocking member 140 described later.

[0056] A third outer peripheral portion 134 is provided on the outer peripheral side of the third cover portion 131. The third outer peripheral portion 134 is formed as a circular protrusion provided on the rear surface of the third cover portion 131. The third outer peripheral portion 134 faces radially outward and has an outer peripheral surface that extends in the wall front-rear direction with a predetermined width (thickness between the front surface and the rear surface). In this embodiment, the width of the outer peripheral surface is the same as the width of the inner peripheral surface. In addition, it is preferable that the outer diameter of the third outer peripheral portion 134 is approximately equal to the inner diameter of the second opening 123 so that the outer peripheral surface of the third outer peripheral portion 134 slides against the inner peripheral surface of the second inner peripheral portion 122 when the adjustment member 130 is assembled to the reduction member 120 main body. And, a flange 134a extending radially outward is provided on the outer periphery of the front side of the third outer peripheral portion 134. The flange 134a is disposed on the step portion 122a of the main body of the reduction member 120, and is configured to engage with the front surface of the second cover portion 121 (or the step portion 122a).

[0057] The mounting portion 136 of the adjustment member 130 is formed so as to protrude radially outward from the end portion on the rear side of the third outer peripheral portion 134. The mounting portions 136 are provided at three locations at equal intervals in the circumferential direction of the third outer peripheral portion 134. The mounting portions 136 are rectangular projections extending a predetermined length in the circumferential direction. The mounting portion 136 is configured to enter from the introduction path 125a of the mounted portion 125 and move circumferentially over the locking claw 125d to the communication path 125b. In addition, a corner on one side in the circumferential direction of the mounting portion 136 is chamfered, so that the movement from the introduction path 125a to the communication path 125b (moving over the locking claw 125d) is guided. On the other hand, since the corner on the other circumferential side of the mounting portion 136 is not chamfered, the mounting portion 136 is locked by the locking claw 125d, making it relatively difficult for the mounting portion 136 to move from the communication passage 125b to the introduction passage 125a (overcoming the locking claw 125d).

[0058] Moreover, on the inner surface of the third inner peripheral portion 132 of the adjustment member 130, three position indicators 132b are provided at the same circumferential positions as the three mounting portions 136. The position indicators 132b are rectangular recessed grooves. Since the position indicators 132b are visible through the third opening 133, when the adjustment member 130 is attached to or detached from the main body of the reduction member 120, the position of the mounting portions 136 can be grasped by the position indicators 132b. In particular, when the indicators 121a of the second cover portion 121 and the position indicators 132b are arranged at the same circumferential positions, the mounting portions 136 of the adjustment member 130 can be inserted into the mounting portion 125 (the introduction path 125a) of the reduction member 120.

[0059] The closing member 140 will be described with reference to Fig. 12 and Fig. 13. Fig. 12 is a perspective view of the closing member 140 as seen from above and below. Figs. 13(a) to (e) are a plan view, a bottom view, a front view, a side view, and a GG cross-sectional view of the closing member 140.

[0060] The blocking member 140 has a disk shape having a front surface facing the front side of the wall and a rear surface facing the rear side of the wall. The blocking member 140 is configured to block the wall hole 12 and the third opening 133 when assembled to the main body of the adjustment member 130. The blocking member 140 has a diameter capable of blocking the third opening 133. The blocking member 140 can also be interpreted as a part of the reduction member 120. That is, the blocking member 140 is indirectly fixed to the reduction member 120 and can cooperate with the adjustment member 130 to block the second opening 123 of the reduction member 120. Alternatively, the assembly of the adjustment member 130 and the blocking member 140 can be regarded as one blocking member.

[0061] The blocking member 140 includes a blocking portion 141 extending in a circular shape and an elastic locking piece 142 erected from the rear surface of the blocking portion 141. The locking piece 142 is formed as two protruding pieces at one location. The locking pieces 142 are formed at two locations near the periphery of the blocking portion 141 so as to face each other across the center. The locking piece 142 has a claw protruding radially outward and is configured to engage with the end surface of the third inner peripheral portion 132 of the adjustment member 130. That is, the blocking member 140 can be assembled to the adjustment member 130 by inserting and pushing the blocking member 140 into the third opening 133 of the adjustment member 130. On the other hand, a notch 143 is formed on the periphery of the blocking portion 141. With the blocking member 140 assembled to the adjustment member 130, the blocking member 140 can be pried open by inserting a tool such as a screwdriver into the notch 143.

[0062] The decorative member 150 will be described with reference to Fig. 14 and Fig. 15. Fig. 14 is a perspective view of the decorative member 150 as seen from above and below. Fig. 15(a) to (e) are a plan view, a bottom view, a front view, a side view, and a HH cross-sectional view of the decorative member 150.

[0063] The decorative member 150 has an annular shape having a front surface facing the front side of the wall and a rear surface facing the rear side of the wall. The decorative member 150 is assembled to the fixed base 110 and configured to cover the front surface of the first cover portion 111 including the head of the screw 117b and the insertion hole thereof. The decorative member 150 may be interpreted as a part of the fixed base 110. The decorative member 150 includes a decorative portion 151 having an outer diameter larger than the outer diameter of the first cover portion 111 and a press-fit protrusion 152 protruding in a pin shape from the rear surface of the decorative portion 151. A circular opening is formed on the radial inner side of the decorative portion 151 such that the decorative portion 151 does not reduce the first opening 113. The press-fit protrusion 152 is a pin having a shape that can be press-fitted into the press-fit portion 119 of the fixed base 110. The press-fit protrusions 152 are provided at three locations at equal intervals in the circumferential direction near the inner peripheral edge of the decorative portion 151. Moreover, a display section 151a, which is a mark for circumferential alignment, is provided on the front surface of the decorative section 151 facing the wall surface side. The relative positions of the fixed base 110 and the reduction member 120 in the circumferential direction can be determined using the display section 151a as a guide. In particular, when the display section 151a and the display section 121a of the reduction member 120 are arranged at the same circumferential position in a state where the decorative section 150 is assembled to the fixed base 110, the assembly section 126 of the reduction member 120 can be inserted into the assembly receiving section 115 (the introduction path 115a) of the fixed base 110. Furthermore, an outer peripheral convex section 151b protruding toward the rear surface side is formed on the outer periphery of the decorative section 151. The outer peripheral convex section 151b extends radially outward from the first cover section 111 of the fixed base 110 and is configured to cover the outer peripheral end surface of the first cover section 111 (see FIG. 3). A step 153 is provided on the inner peripheral edge of the front surface of the decorative portion 151, which is recessed in a stepped shape over the entire circumferential direction. The step 153 is configured to accommodate the flange 124a of the reduction member 120. That is, the decorative member 150 is attached to the fixed base 110, and covers and conceals the screws 117b and their insertion holes, thereby preventing the screws 117b and the insertion holes from impairing the aesthetic appearance of the entire wall 11.

[0064] Based on the above description, the instrument mounting auxiliary member 100 of this embodiment will be described in more detail.

[0065] In the assembled state of the tool mounting auxiliary member 100 of this embodiment, the fixed base 110, the reduction member 120, the adjustment member 130, the blocking member 140, and the decorative member 150 are assembled together without any gaps. As shown in Fig. 3, in the assembled state of the tool mounting auxiliary member 100, the flanges 124a, 134a and the outer periphery of the blocking member 141 are fitted to the steps 153, 122a, 132a, so that the front surface facing the wall surface is flush. As shown in Fig. 4, in the assembled state of the fixed base 110 and the reduction member 120, the mounting portion 126 is disposed in the communication passage 115b of the mounting portion 115, and the locking claw 115d restricts the movement of the mounting portion 126 to the introduction passage 115a. At this time, the mounting portion 126 is engaged with the restricting wall 115c from the front side, and the flange 124a is engaged with the step portion 153 (or the front surface of the first cover portion 111) from the rear side, thereby restricting the relative movement between the fixed base 110 and the reduction member 120 in the wall front-rear direction. In other words, when the device is attached, the fixed base 110 engages the reduction member 120 in the wall front-rear direction, preventing the reduction member 120 from moving in the wall rear direction. In addition, by forcibly rotating the fixed base 110 and the reduction member 120 relatively in one circumferential direction from the assembled state, the members are flexibly deformed, and the mounting portion 126 is moved to the introduction path 115a, whereby the mounting portion 126 and the assembled portion 115 can be separated.

[0066] The reduction member 120 and the adjustment member 130 are assembled in the same manner, and the assembly portion 136 and the assembled portion 125 are assembled together to restrict relative movement between the reduction member 120 and the adjustment member 130 in the wall front-back direction. Similarly, the reduction member 120 and the adjustment member 130 can be forcibly rotated relative to each other in one circumferential direction from the assembled state, and the assembly portion 136 and the assembled portion 125 can be separated while bending and deforming the members. In other words, the fixed base 110, the reduction member 120, and the adjustment member 130 are assembled together so that relative movement in both the wall back direction and the wall front direction is restricted, and therefore, accompanying movement to the wall back when the tool is pushed in is prevented.

[0067] A blocking member 140 is attached to the adjustment member 130 to block the third opening 133. Furthermore, a decorative member 150 is attached to the front surface of the first cover portion 111 of the fixed base 110 to cover and conceal the entire front surface. By selectively and independently removing any of the members from the appliance mounting auxiliary member 100 in the assembled state, any of the first opening 113, the second opening 123, and the third opening 133 can be used as an appliance mounting hole.

[0068] Fig. 16 shows the mounting structure 10 of the instrument mounting auxiliary member 100. In the mounting structure 10 of Fig. 16, the reduction member 120 is removed from the instrument mounting auxiliary member 100, and a first opening 113 is formed inside the wall hole 12 as a first corresponding mounting hole. As shown in Fig. 16, a first instrument 15 can be mounted to the first opening 113.

[0069] Here, the configuration of the first fixture 15 will be described with reference to FIG. 16. The first fixture 15 includes a fixture body 16 that houses an electric lamp such as an LED bulb, and an annular flange portion 17 that protrudes laterally from the lower surface (illumination side end surface) of the fixture body 16. The fixture body 16 is formed in a cylindrical shape that becomes thinner as it approaches the tip on the back side of the wall. A pair of leaf spring-like elastic pieces 18 extend laterally from the base end of the back side of the flange portion 17 in the fixture body 16. The elastic pieces 18 extend at an angle close to the flange portion 17 and can be elastically deformed in a direction away from the flange portion 17 (upward). The elastic pieces 18 that are elastically deformed in the direction away from the flange portion 17 and the flange portion 17 can sandwich and hold a plate material of a predetermined thickness (the periphery of the mounting hole) by elastic force. That is, the flange portion 17 and the elastic pieces 18 work together to function as a clamping portion. The clamping portion of the first tool 15 has a minimum wall thickness and a maximum wall thickness that can be clamped, and can be attached to a plate material having a thickness between the minimum wall thickness and the maximum wall thickness. The first tool 15 can be easily attached by inserting the rear side portion into the mounting hole and pushing it against the wall. The elastic piece of the clamping portion is not limited to a leaf spring, and may be a non-elastic member such as a claw.

[0070] The diameter of the first corresponding mounting hole of the first appliance 15 is mainly determined by the mounting diameter of the portion adjacent to the flange portion 17 of the appliance body 16. If the mounting diameter of the appliance body 16 is larger than the mounting hole, the first appliance 15 cannot be inserted into and mounted on the mounting hole. On the other hand, even when the mounting diameter of the appliance body 16 is smaller than the mounting hole, if the difference between the mounting diameter and the inner diameter of the mounting hole is large, the mounting hole cannot be covered by the flange portion 17 or the clamping by the elastic piece 18 becomes impossible, and thus, similarly, the first appliance 15 cannot be mounted on the mounting hole. That is, the first corresponding mounting hole is defined as a mounting hole having a diameter or size within a predetermined range (having a maximum diameter and a minimum diameter) on which the first appliance 15 can be mounted.

[0071] The second appliance 15' (see Fig. 17(b)) and the third appliance 15'' (see Fig. 17(c)) are miniaturized versions of the first appliance 15 and have the same configuration. Similarly, the second corresponding mounting hole and the third corresponding mounting hole are also defined as mounting holes having a diameter or size within a range (having a maximum diameter and a minimum diameter) on which the second appliance 15' and the third appliance 15'' can be respectively mounted.

[0072] FIG. 17(a) shows a configuration in which a first device 15 is attached to the mounting structure 10. As shown in FIG. 17(a), the wall 11 (the periphery of the wall hole 12) is clamped between the clamping body 118 and the flange 114a, so that the fixed base 110 is fixed to the wall hole 12. Only the decorative member 150 is attached to the fixed base 110, and the reduction member 120 is removed from the fixed base 110. Then, the wall hole 12 is reduced by the first cover part 111, and a first opening 113 is formed inside the wall hole 12 as a first corresponding mounting hole. This first opening 113 has a size within the range of the maximum diameter and the minimum diameter of the first corresponding mounting hole, and the first device 15 is attached to the first opening 113. The first inner circumferential portion 112 has a width in the wall front-rear direction between the minimum wall thickness and the maximum wall thickness at which the device 15 can be attached, and this allows the elastic piece 18 of the first device 15 to be pressed against the periphery of the first opening 113 (the rear surface of the first inner circumferential portion 112). In this way, since the first inner circumferential portion 112 ensures a wall thickness at which the first device 15 can be attached, it can become a clamped portion that is clamped by the clamping portion of the first device 15 regardless of the actual thickness of the wall 11. However, the clamping portion (leaf spring) of the first device 15 may be configured to clamp the wall 11 directly, rather than the rear surface of the fixed base 110.

[0073] FIG. 17(b) shows a configuration in which a second device 15' is attached to the mounting structure 10. As shown in FIG. 17(b), the second device 15' is one size smaller than the first device 15. That is, the maximum diameter of the second corresponding mounting hole of the second device 15' is smaller than the minimum diameter of the first corresponding mounting hole of the first device 15. As shown in FIG. 17(b), the wall 11 (the periphery of the wall hole 12) is clamped between the clamping body 118 and the flange 114a, so that the fixing base 110 is fixed to the wall hole 12. In addition, the reduction member 120 and the decorative member 150 are assembled to the fixing base 110, and the adjustment member 130 is removed from the reduction member 120. Then, the wall hole 12 is further reduced by both the first cover portion 111 and the second cover portion 121, and a second opening 123 is formed inside the wall hole 12 as a second corresponding mounting hole. The second opening 123 has a size within the range of the maximum diameter and the minimum diameter of the second corresponding mounting hole, and the second device 15' is attached to the second opening 123. The second inner peripheral portion 122 has a width in the wall front-rear direction between the minimum wall thickness and the maximum wall thickness at which the second device 15' can be attached, and thus the elastic piece 18 of the second device 15' is pressed against the periphery of the second opening 123 (the rear surface of the second inner peripheral portion 122). In this way, since the second inner peripheral portion 122 has a wall thickness at which the second device 15' can be attached, it can become a clamped portion that is clamped by the clamping portion of the second device 15' regardless of the actual thickness of the wall 11. However, the clamping portion (leaf spring) of the second device 15' may be configured to directly clamp the fixed base 110 or the wall 11, rather than the rear surface of the reduction member 120.

[0074] FIG. 17(c) shows a configuration in which a third device 15'' is attached to the mounting structure 10. As shown in FIG. 17(c), the third device 15'' is one size smaller than the second device 15'. In other words, the maximum diameter of the third corresponding mounting hole of the third device 15" is smaller than the minimum diameter of the second corresponding mounting hole of the second device 15'. As shown in FIG. 17(c), the wall 11 (the periphery of the wall hole 12) is clamped between the clamping body 118 and the flange 114a, thereby fixing the fixed base 110 to the wall hole 12. The reduction member 120 and the decorative member 150 are assembled to the fixed base 110, and the adjustment member 130 is assembled to the reduction member 120. The first covering portion 111, the second covering portion 121 and the third covering portion 131 work together to further reduce the wall hole 12, and a third opening 133 is formed inside the wall hole 12 as a third corresponding mounting hole. This third opening 133 has a size within the range of the maximum and minimum diameters of the third corresponding mounting hole, and the third device 15" is attached to the third opening 133. The third inner peripheral portion 132 has a width in the wall front-rear direction between the minimum wall thickness and the maximum wall thickness at which the device 15" can be attached, whereby the elastic piece 18 of the third device 15" is pressed against the periphery of the third opening 133 (the rear surface of the third inner peripheral portion 132). In this way, since the third inner peripheral portion 132 ensures a wall thickness at which the third device 15" can be attached, it can become a clamped portion that is clamped by the clamping portion of the third device 15" regardless of the actual thickness of the wall 11. However, the clamping portion (leaf spring) of the third device 15" may be configured to directly clamp the fixed base 110, the reduction member 120 or the wall 11, rather than the rear surface of the adjustment member 130.

[0075] Fig. 18 shows the mounting structure 10 in a state where no appliance is attached or where the appliance has been removed. As shown in Fig. 18, the wall 11 (the periphery of the wall hole 12) is clamped between the clamping body 118 and the flange 114a, whereby the fixed base 110 is fixed to the wall hole 12. All of the members, the reduction member 120, the adjustment member 130, the closing member 140 and the decorative member 150, are assembled to the fixed base 110. In this way, when there is no need to attach an appliance, the wall hole 12 is completely closed, so that the aesthetic appearance of the entire wall 11 can be maintained.

[0076] Next, a method for constructing the mounting structure 10 by installing the instrument mounting auxiliary member 100 in the wall hole 12 will be described.

[0077] As shown in FIG. 19, hold the fixture mounting auxiliary member 100 in the assembled state, and insert it into the wall hole 12 from the wall surface side with its rear surface facing the wall hole 12. At this time, remove the decorative member 150 from the fixture mounting auxiliary member 100 in the assembled state, rotate the clamping body 118 of the fixed pedestal 110 in the circumferential direction, and deform it so as not to interfere with the peripheral edge of the wall hole 12. Next, insert the standing portion 117 and the first outer peripheral portion 114 into the wall hole 12, and apply the flange 114a (hanging portion) to the surface of the wall 11. By applying the flange 114a (hanging portion) to the surface of the wall 11 and bringing the outer surface of the first outer peripheral portion 114 into sliding contact with the inner peripheral surface of the wall hole 12, the positioning of the fixture mounting auxiliary member 100 can be achieved. In this state, as shown in FIG. 20(a), rotate the screw 117b in the first direction with a driver, and rotate the clamping body 118 so as to project radially outward. By rotating the clamping bodies 118 at other locations so as to project radially outward as well, the clamping bodies 118 can be hooked on the back surface of the wall 11, and the fixture mounting auxiliary member 100 can be temporarily held with respect to the wall hole 12. Further, by rotating the screw 117b in the first direction with a driver, as shown in FIG. 20(b), the clamping body 118 is driven in a direction approaching the wall 11. Rotate the screw 117b in the first direction until the wall 11 is clamped between the clamping body 118 and the flange 114a. By performing the same operation for all locations, the fixture mounting auxiliary member 100 can be fixed to the wall hole 12 by the clamping means. Then, press-fit the press-fitting protrusion 152 of the decorative member 150 into the press-fitting portion 119 of the fixed pedestal 110, and assemble the decorative member 150 to the fixed pedestal 110 from the wall surface side. Thereby, the mounting structure 10 in a state where the wall hole 12 is completely closed is constructed.

[0078] Next, a process of selectively forming a mounting hole inside the wall hole 12 according to the type or size of the mounting tool to be mounted from the mounting structure 10 in a state in which the wall hole 12 is completely blocked will be described. As shown in FIG. 21(a), when the mounting tool is the first tool 15, the user can rotate the reducing member 120 from the front side of the wall to remove the reducing member 120 from the fixed base 110 and form the first opening 113 corresponding to the first corresponding mounting hole. As shown in FIG. 21(b), when the mounting tool is the second tool 15', the user can rotate the adjusting member 130 from the front side of the wall to remove the adjusting member 130 from the reducing member 120 and form the second opening 123 corresponding to the second corresponding mounting hole. As shown in FIG. 21(c), when the fixture to be attached is the third fixture 15", the user can pry open and remove the blocking member 140 from the front side of the wall with a screwdriver to form a third opening 133 corresponding to the third corresponding mounting hole. In this way, a mounting hole can be appropriately provided inside the wall hole 12 depending on the type or size of the fixture to be attached. Note that, in this example, the decorative member 150 is not attached to the fixing base 110, but the same operations as described above can be performed regardless of whether the decorative member 150 is present or not.

[0079] The above-mentioned method of constructing the mounting structure 10 is merely an example, and it goes without saying that other processes may be used. For example, when the type or size of the instrument to be mounted is predetermined, any member may first be selectively separated from the instrument mounting auxiliary member 100, and then the instrument mounting auxiliary member 100 may be fixed to the wall hole 12. In addition, after removing the reducing member 120 from the fixed base 110 from the wall surface side, the adjusting member 130 or the blocking member 140 may be selectively removed from the reducing member 120, and then the reducing member 120 may be reassembled from the wall surface to the fixed base 110.

[0080] In other words, the reduction member 120 and the adjustment member 130 can be assembled to the fixed base 110 fixed to the wall 11 by operating from the front side of the wall, and can also be removed from the assembled state by operating from the front side of the wall, so that the assembly members can be easily changed or selected even after the mounting structure 10 has been constructed.

[0081] The following describes the effects of the appliance mounting auxiliary member 100 according to one embodiment of the present invention.

[0082] According to the instrument mounting auxiliary member 100 of this embodiment, the instrument mounting auxiliary member 100 is configured to form mounting holes for mounting instruments by the openings 113, 123, and 133. The instrument mounting auxiliary member 100 includes a fixed base 110 having a first opening 113 that opens as a first corresponding mounting hole of a first instrument 15, and a reduction member 120 that is detachably assembled to the fixed base 110 and has a second opening 123 that opens inside the first opening 113 as a second corresponding mounting hole of a second instrument 15'. As a result, when the first instrument 15 is to be installed on the wall 11, the instrument mounting auxiliary member 100 is installed in the wall hole 12 with the reduction member 120 removed from the fixed base 110, whereby the first opening 113 corresponding to the first corresponding mounting hole is formed inside the wall hole 12, and the first instrument 15 can be attached to the first opening 113 of the fixed base 110. On the other hand, when a second fixture 15' having a second corresponding mounting hole different from that of the first fixture 15 is to be installed on the wall 11, the fixture installation auxiliary member 100 is installed on the wall hole 12 with the reduction member 120 attached to the fixed base 110, so that a second opening 123 corresponding to the second corresponding mounting hole is formed inside the wall hole 12, and the second fixture 15' can be installed on the second opening 123 of the reduction member 120. Furthermore, by adding the adjustment member 130 and the blocking member 140 to the reduction member 120, it is also possible to install a third fixture 15" corresponding to the third corresponding mounting hole, and when no fixture is installed, the wall hole 12 can be completely blocked to prevent a decrease in the aesthetic appearance of the entire wall 11. Therefore, the fixture installation auxiliary member 100 of this embodiment reduces the wall hole 12 to a plurality of different sizes, thereby making it possible to install different fixtures 15, 15', 15" having different corresponding mounting holes in the wall hole 12.

[0083] [Variations] The present invention is not limited to the above-described embodiment, and various modifications are possible. Modifications of the present invention will be described below. In each modification, components indicated by three digits that have the same last two digits have the same or similar characteristics unless otherwise specified, and the description thereof will be omitted.

[0084] (1) In the instrument mounting auxiliary member of the present invention, in order to simplify the configuration, one or more of the adjustment member, the blocking member, and the decorative member may be omitted from the instrument mounting auxiliary member. The instrument mounting auxiliary member 100-1 shown in FIG. 22 has a simpler configuration than the instrument mounting auxiliary member 100 of the above embodiment, and includes a fixed base 110, a reduction member 120, a blocking member 140', and a decorative member 150. That is, the instrument mounting auxiliary member 100-1 omits the adjustment member, and instead employs a blocking member 140' with a larger diameter that blocks the second opening 123 of the reduction member 120. Similarly, the instrument mounting auxiliary member 100-1 of this embodiment allows different instruments 15, 15' having different corresponding mounting holes to be mounted on a wall. Note that the blocking member 140' may be added as one of the selection members to the instrument mounting auxiliary member 100 of the above embodiment. In other words, the reduction member of the present invention is a component that can detachably include a plurality of selection members in addition to forming the second opening.

[0085] (2) In the tool mounting auxiliary member of the present invention, the reduction member may be configured to have a decorative portion that covers or conceals the entire or part of the portion exposed on the wall surface side instead of the decorative portion. The tool mounting auxiliary member 100-2 shown in FIG. 23 is configured such that the decorative portion is integrally formed with the adjustment member, which is a part of the reduction member, with respect to the tool mounting auxiliary member 100 of the above embodiment. The tool mounting auxiliary member 100-2 includes the fixed base 110, the reduction member 120, the adjustment member 130', and the closing member 140. The adjustment member 130' includes a decorative portion 138 configured to cover or conceal the entire front surface of the portion (the first cover portion 111, the second cover portion 121, and the third cover portion 131) of the fixed base 110 exposed on the wall surface side when the third opening 133 is open. In other words, the reduction member 120 includes a decorative portion 138 configured to cover or conceal the entire portion of the fixed base 110 exposed on the wall surface side when assembled to the fixed base 110. Although not shown, a cosmetic portion may be integrally provided on the reducing member 120 or the closing member 140. Note that an adjustment member 130' may be added to the instrument mounting auxiliary member 100 as one of the optional members.

[0086] (3) The fixture mounting auxiliary member of the present invention is not limited to the above embodiment, and each component may have various shapes and dimensions according to the shape of the fixture. The fixture mounting auxiliary member 100-3 shown in FIG. 24 is configured such that the reducing member has a square opening in comparison with the fixture mounting auxiliary member 100 of the above embodiment. The fourth fixture 15''' illustrated in FIG. 24 is a square downlight, and requires a square fourth corresponding mounting hole for mounting. That is, the fixture mounting auxiliary member 100-3 comprises a fixed base 110 and a second reducing member 120'. The second reducing member 120' has a fourth cover portion 121' and a rectangular fourth opening 123' as the fourth corresponding mounting hole. That is, by assembling the second reducing member 120' to the fixed base 110, the mounting hole can be changed from a round shape to a square shape. Therefore, in this fixture mounting auxiliary member 100-3, it is possible to change not only the size of the fixture but also the shape of the mounting hole to match the shape of the fixture.

[0087] In addition to the first reducing member 120, the second reducing member 120' may be added as one of the selection members to the appliance mounting auxiliary member 100 of the above embodiment. In other words, the reducing member may be composed of two selectable types of reducing members. That is, the reducing member may include the first reducing member 120 forming the circular second opening 123 and the second reducing member 120' forming the rectangular fourth opening 123'. With this configuration, the user can select one of the two types of reducing members according to the type of appliance (round or square) and reliably mount the appliance. Furthermore, the shape of the third opening of the adjustment member may be changed, and the adjustment member may be composed of a plurality of adjustment members with different opening shapes.

[0088] (4) In the instrument mounting auxiliary member of the present invention, one or more adjustment members having an opening smaller than the third opening, rather than a blocking member, may be further assembled in a nested manner to the third opening of the adjustment member of the reduction member. That is, the number of stages of the assembly member can be increased as necessary to increase the number or types of compatible corresponding mounting holes without being limited to the number of stages (three stages) in the above embodiment.

[0089] (5) In the instrument mounting auxiliary member of the present invention, the mounting means of the mounting member (the form of the mounting part and the mounted part) is not limited to the above embodiment, and may be selected from any mounting means. For example, the inner surface of the inner periphery of the opening of the fixed base (or the reduction member) may be a female thread, and the outer periphery of the reduction member (or the adjustment member) may be a male thread, and both may be attached and detached by screw rotation. In addition, the mounting means may be selected from any means such as pasting, adhesion, fitting, locking, and magnetic attachment.

[0090] (6) In the above embodiment, the shapes of the openings 113, 123, and 133 are similar to the outer edge shapes of the flanges 114a, 124a, and 134a, but the present invention is not limited to this, and the shapes of the openings 113, 123, and 133 may be different. For example, the outer edge shapes of the flanges 114a, 124a, and 134a may be rectangular, and the shapes of the openings 113, 123, and 133 may be circular.

[0091] (7) In the above embodiment, the fixing portion is configured as a clamping means, but the present invention is not limited to this. For example, the fixing portion may be selected from any means such as screwing, pasting, adhesion, fitting, locking, magnetic attachment, etc.

[0092] (8) In the above embodiment, the first opening of the fixed base, the second opening of the reduction member, and the third opening of the adjustment member are all configured to reduce in a concentric manner, but the present invention is not limited to this, and the openings may be configured to reduce while shifting their centers.

[0093] The present invention is not limited to the above-described embodiment and modifications, and may be embodied in various forms within the technical scope of the present invention. [Explanation of symbols]

[0094] 10. Mounting structure 11. Wall 12 wall hole 15. Equipment 16 Equipment body 17 Flange (part of clamping part) 18 Elastic piece (part of clamping part) 100 Equipment mounting auxiliary parts 110 Fixed base 111 First cover part 111a Display section (mark) 112 1st inner circumference 113 First Opening 114 First outer periphery 114a Flange (hanging part) 115 Mounting part (fixed base side) 115a Inlet path 115b Communication path 115c Regulatory Wall 115d locking claw 117 Vertical section 117a Storage unit 117b Bis 117c Slit 118 Clamping body 119 Press-fit part 120 Reduced Parts 121 Second cover part 121a Display unit (mark) 122 2nd inner circumference 122a Stepped section 123 Second Opening 124 Second outer periphery 124a flange 125 Assembled part (shrinking part side) 125a Inlet path 125b Communication path 125c Regulatory Wall 125d locking claw 126 Assembly section (shrinking part side) 130 Adjustment member 131 Third Cover 132 Third inner circumference 132a Stepped section 132b Position display section 133 Third Opening 134 Third Outer Circle 134a Flange 136 Assembly part (adjustment member side) 140 Closure member 141 Occlusion 142 Locking piece 143 Notch 150 Decorative materials 151 Makeup Department 151a Display unit (mark) 151b Outer periphery protrusion 152 Press-fit projection 153 Stepped section

Claims

1. An auxiliary tool mounting member that enables mounting of a tool selected from a tool group including at least a first tool that can be mounted in a first corresponding mounting hole that is smaller than the wall hole provided in a wall, and a second tool that can be mounted in a second corresponding mounting hole that is smaller than the first corresponding mounting hole, a fixing base including a fixing portion fixed to the wall, a first cover portion covering a part of the wall hole so as to reduce the size of the wall hole when the fixing portion is fixed to the wall, and a first opening portion opening as the first corresponding mounting hole on the inside of the first cover portion; a reduction member including an assembly portion that is detachably assembled to the fixed base, a second cover portion that covers a part of the first opening so as to reduce the first opening when the assembly portion is assembled to the fixed base, and a second opening that opens as the second corresponding mounting hole inside the second cover portion; An auxiliary member for attaching an instrument, comprising:

2. The instrument mounting auxiliary member according to claim 1, characterized in that the reduction member is configured to be assembled to the fixed base fixed to the wall by an operation from the front side of the wall, and to be removable from the assembled state by an operation from the front side of the wall.

3. The instrument mounting auxiliary member described in claim 1 or 2, characterized in that the fixed base further includes an attachment portion on an inner periphery of the first opening, and the attachment portion of the reduction member is capable of forming and releasing a connection between the attachment portion and the attachment portion by being inserted into the first opening and rotating relatively in the circumferential direction of the first opening.

4. An instrument mounting auxiliary member as described in any one of claims 1 to 3, characterized in that when the reduction member is assembled to the fixed base, movement of the reduction member relative to the fixed base in both the back direction of the wall and the front direction of the wall is restricted.

5. the fixed base further includes a hook portion extending so as to hook onto a peripheral edge of the front wall side of the wall hole outside the first cover portion, and a clamping body arranged behind the wall and movable toward the front wall side, abutting against the peripheral edge of the rear wall side of the wall hole and clamping the wall in cooperation with the hook portion; An instrument mounting auxiliary member as described in any one of claims 1 to 4, characterized in that the width of the inner peripheral portion of the first opening in the wall front-to-back direction is greater than the minimum wall thickness at which an instrument can be mounted and smaller than the maximum wall thickness at which an instrument can be mounted.

6. the fixing portion includes a clamping means for clamping the wall in a front-back direction to fix the fixing base to the wall, The clamping means includes a clamping body that moves in a wall front-rear direction to clamp the wall, a housing portion that houses the clamping body and has an insertion hole that opens on the wall front side, and a screw that is inserted into the housing portion through the insertion hole from the wall front side, is screwed into the clamping body, and drives the clamping body in the wall front-rear direction by a screw rotation operation from the wall front side, The tool mounting auxiliary member according to any one of claims 1 to 5, further comprising a decorative member attached to the fixed base for covering the screw and the insertion hole.

7. An instrument mounting auxiliary member as described in any one of claims 1 to 5, characterized in that the reduction member has a decorative portion configured to cover all or part of the exposed area of ​​the fixed base on the wall surface when assembled to the fixed base.

8. the group of devices further includes a third device mountable in a third corresponding mounting hole smaller than the second corresponding mounting hole; The reduction member includes an adjustment member that is detachably attached to the inside of the second cover portion, The instrument mounting auxiliary member described in any one of claims 1 to 7, characterized in that the adjustment member comprises a third cover portion that covers a portion of the second opening so as to reduce the second opening when assembled inside the second cover portion, and a third opening that opens inside the third cover portion as the third corresponding mounting hole.

9. The instrument mounting auxiliary member according to any one of claims 1 to 8, further comprising a closing member attached to the fixed base or the reduction member and capable of closing an opening formed by the reduction member.

10. 10. The instrument mounting auxiliary member according to claim 1, wherein the reducing member includes a first reducing member forming a circular opening and a second reducing member forming a rectangular opening.

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