Free-standing mounting base

Abstract

To provide a flexible mounting base by which a connection of a support pole portion to a base portion is not shifted even if a moment acting on an end of the support pole portion becomes large and further a concentration of a load on one of claws can be suppressed.SOLUTION: A flexible mounting base includes: a base portion 20 fixed to an installation surface 100; a support pole portion 30 connected to a base opening portion 22 in a state where one end side (upper surface 32A of a flange portion 32) is exposed to the installation surface 100 side of the base portion 20; a sensor mounting portion 42 connected to the other end side (mounting hole 34) of the support pole portion 30; and a spacer 60 arranged so as to be in contact with both sides of one end surface of the installation surface 100 and the support pole portion 30, in a state where the base portion 20 is fixed to the installation surface 100.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a universal mounting base on which a detector such as a fire detector can be mounted, and more particularly to a universal mounting base for mounting the detector so that it faces in any direction from a ceiling or wall surface. [Background technology]

[0002] A known example of a free-standing mounting base for mounting a detector such as a fire detector in any direction from an installation surface is the free-standing mounting base described in Patent Document 1. The free-standing mounting base described in Patent Document 1 has a base fixed to the ceiling, which is the installation surface, and a mounting portion on which the fire detector can be installed is provided at the tip of a support column attached to the base.

[0003] Fig. 12 shows such a free mount base in use with a detector attached, with Fig. 12(A) being a view from the monitoring direction of the detector, and Fig. 12(B) being a view from the left of Fig. 12(A). Here, the free mount base 110 has a base 120 connected to a support section 130 fixed to an installation surface 100, and a mounting section 140 to which a fire detector 150 is attached is connected to the tip of the support section 130. Also, the angle of the mounting section 140 is variable around the axis A of the support section 130 and in the vertical direction B, so that the fire detector 150 can be oriented in any direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-016132 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in such a flexible mounting base, as shown in Figure 13(A), which is a partial cross-sectional view of the flexible mounting base shown in Figure 12, the support portion 130 is connected to the base 120 by inserting the support portion 130 from above into the base opening 122 in the center of the base 120 and engaging the flange portion 132, which is the end (one end side) of the support portion 130, with a pair of engaging members 124.Therefore, in the connection between the base 120 and the support portion 130, there is a play at least within the tolerance range due to the fitting tolerance and engagement accuracy, and this play tends to increase with age.

[0006] Due to this structure, as shown in FIG. 14, if the angle θ between the monitoring direction of fire detector 150 and the vertical direction is set large, or if the weight of fire detector 150 attached to the tip (other end) of support section 130 is large, the moment M acting on the end of support section 130 will become large, causing the connection angle of support section 130 relative to base 120 to shift, and the orientation of fire detector 150 will also shift (tilt).

[0007] For example, if the fire detector 150 is a spot type detector and the facility in which it is installed is a large space with a high ceiling, such as an atrium in a commercial facility or an entrance hall in a building, the spot type detector may be installed at a height of H = 30 m from the floor surface which is the monitoring position. If the spot type detector is installed in the state shown in Figure 14 (θ ≒ 45°) and the angle θ is tilted by Δθ = 1° from the installation standard, for example, the monitoring position will shift by approximately T = 1 m.

[0008] Furthermore, as shown in FIG. 13(B), a pair of locking members (claw members) 124 (to prevent slipping out) are provided on the outside of base opening 122 to engage with flange 132, which is the end of support portion 130, to maintain the connection of support portion 130. However, due to moment M acting on flange 132 of support portion 130, a load in the direction of releasing the lock is concentrated on one side of locking members 124 (the left side in the figure), and this locking member 124 may become deformed or damaged due to aging, etc. Furthermore, even if locking member 124 is deformed or damaged, it is difficult to detect the deformation or damage from the appearance of the swivel mounting base 110.

[0009] The present invention proposes a solution to the problems with such adjustable mounting bases, and aims to provide a adjustable mounting base that will not dislocate the connection of the support portion to the base even if a large moment acts on the end of the support portion, and that can prevent the concentration of load on one of the engaging members. [Means for solving the problem]

[0010] [ Free mounting stand 1 ] The present invention provides a universal mount, comprising: A base that is fixed to an installation surface; a support part connected to an opening of the base with one end side exposed on the installation surface side of the base; a sensor mounting portion connected to the other end side of the support portion; With the base fixed to the installation surface, A part of one end Installation surface At the same time, the other portion of the one end is deformed by pressure from the installation surface and comes into contact with the installation surface, and the other end One end face of the support To A spacer disposed in contact with the substrate; The present invention is characterized by comprising:

[0011] [ Freely adjustable mounting stand 2 ] The present invention also provides a universal mounting base, comprising: A base that is fixed to an installation surface; a support portion connected to an opening of the base with one end side exposed on the installation surface side of the base; a sensor mounting portion connected to the other end side of the support portion; a spacer disposed in contact with both sides of the installation surface and one end surface of the support column when the base is fixed to the installation surface; Equipped with the base includes a base engagement portion that defines a position at which the spacer is disposed; The spacer includes a spacer engagement portion that engages with the base engagement portion.

[0012] [First and third embodiments (structures with multiple spacers)] The base includes a plurality of base engagement portions; The spacers are provided in the same number as the plurality of base engaging portions, The spacers engage with the base engagement portions, respectively.

[0013] [Second and fourth embodiments (structures having multiple spacer engagement portions)] the base portion includes a plurality of base portion engaging portions at positions facing each other across the connected support portion; The spacer includes a plurality of spacer engagement portions, The spacer engagement portions are engaged with the corresponding base engagement portions, respectively.

[0014] [Installation surface side flat section, support side flat section or support side straight section and connecting flat section] The spacer is an installation surface side flat surface portion that comes into contact with the installation surface when the spacer engagement portion engages with the corresponding base engagement portion and the base is fixed to the installation surface; a support portion-side flat portion or a support portion-side straight portion that comes into contact with one end surface of the support portion when the spacer engagement portion is engaged with the corresponding base engagement portion; A connecting flat portion that is connected to the installation surface side flat portion and is connected to the support portion side flat portion or the support portion side straight portion; Equipped with.

[0015] [Flat or straight part in contact with the installation surface] The spacer has an upper flat portion or an upper straight portion that comes into contact with the installation surface when the spacer engagement portion engages with the corresponding base engagement portion and the base is fixed to the installation surface.

[0016] [Flat or straight part in contact with one end face] The spacer has a lower flat portion or a lower straight portion that comes into contact with one end face of the support post when the spacer engaging portion is engaged with the corresponding base engaging portion.

[0017] [Spacer engagement part] The spacer engaging portion is elastically deformable, and when engaged with the base engaging portion, a force acts in a direction pressing the base engaging portion.

[0018] [Base engagement part placement] At least one opposing pair of the base engaging portions are disposed at positions for fixing the base to the installation surface. Effect of the Invention

[0019] [Basic Effects] The present invention is a flexible mounting base that includes a base to be fixed to an installation surface, a support portion connected to an opening of the base with one end exposed on the installation surface side of the base, and a detector mounting portion connected to the other end side of the support portion, and with the base fixed to the installation surface, a spacer is arranged so as to contact both the installation surface and one end face of the support portion, so that the installation surface is directly subjected to a force acting to shift the connection angle of the support portion to the base due to a moment acting on the end of the support portion.As a result, even if the angle with the sensor mounting portion in the vertical direction becomes large or the weight of the fire sensor attached to the sensor mounting portion is heavy, the connection angle of the support portion to the base will not shift, and the target location can be monitored by the fire sensor, and further, load is not concentrated on the locking member, preventing the locking member from being deformed or damaged.

[0020] [Effects of the structure with spacer engagement part and base engagement part] The spacer is positioned by engaging the spacer engagement portion with the base engagement portion of the base, so that after the support portion and the base are connected, the spacer can be fitted (engaged) into the base engagement portion, making it easy to position the spacer during installation.

[0021] [Effect of a structure with multiple spacers] The base includes a plurality of base engaging portions, and the spacers are engaged with the plurality of base engaging portions, respectively, thereby allowing the spacer to have a simple structure.

[0022] [Effects of a structure with multiple spacer engagement parts] The base has a plurality of base engaging portions at opposing positions across the connected support portion, and the spacer has a plurality of spacer engaging portions. By engaging the plurality of spacer engaging portions with corresponding plurality of base engaging portions, the number of spacers used can be reduced.

[0023] [Effects of the flat surface on the installation surface, the flat surface on the support section or the straight surface on the support section and the connecting flat surface] The spacer is equipped with an installation surface side flat portion that contacts the installation surface when the spacer engaging portion engages with the corresponding base engaging portion and the base is fixed to the installation surface, a support portion side flat portion or a support portion side straight portion that contacts one end face of the support portion when the spacer engaging portion engages with the corresponding base engaging portion, and a connecting flat portion that is connected to the installation surface side flat portion and also connects to the support portion side flat portion or the support portion side straight portion.When a user attaches or removes the spacer from the base, the user's fingers will come into contact with the installation surface side flat portion and / or the connecting flat portion, which will not be sharp compared to when either is composed of a straight portion, making it possible to perform the work safely and easily.

[0024] [Effect of the structure in which the spacer comes into contact with one end face of the support and the installation surface] The spacer has an upper flat portion or lower straight portion that contacts the installation surface and a lower flat portion or lower straight portion that contacts one end face of the support portion when the spacer engaging portion engages with the base engaging portion and the base is fixed to the installation surface.This allows the support portion to be firmly fixed to the installation surface and prevents the monitoring direction of the fire detector from shifting.

[0025] [Effect of the structure that allows the spacer engagement part to be elastically deformed] The spacer engagement portion is elastically deformable, and when engaged with the base engagement portion, a force acts in a direction pressing the base engagement portion, making it possible to prevent the spacer from falling or coming loose during installation work.

[0026] [Effect of the base engagement arrangement] At least one opposing pair of the multiple base engagement portions are positioned at a position to fix the base to the installation surface, thereby preventing the base from tilting or floating relative to the installation surface when the base is fixed to the installation surface. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is an explanatory diagram showing the appearance of a free-standing mounting base according to the present invention; [Diagram 2] An explanatory diagram of the support part connected to the base, viewed from diagonally above [Diagram 3] An explanatory diagram showing a cross section of the support part connected to the base part. [Figure 4] FIG. 1 is an explanatory diagram showing a first embodiment of a free-standing mount according to the present invention; [Diagram 5] An explanatory diagram of the spacer shown in FIG. 4 as seen obliquely from above. [Figure 6] FIG. 11 is an explanatory diagram showing a second embodiment of the swivel mount according to the present invention; [Figure 7] An explanatory diagram of the spacer shown in FIG. 6, viewed obliquely from above. [Figure 8] FIG. 11 is an explanatory diagram showing a third embodiment of the swivel mount according to the present invention; [Figure 9] FIG. 9 is an explanatory diagram showing the spacer shown in FIG. 8 as seen obliquely from above. [Figure 10] FIG. 11 is an explanatory diagram showing a fourth embodiment of the swivel mount according to the present invention; [Figure 11] FIG. 11 is an explanatory diagram showing the spacer shown in FIG. 10 as seen obliquely from above. [Figure 12] An explanatory diagram showing the free-standing mounting base in use [Figure 13] FIG. 13 is an explanatory diagram showing a cross section of the swivel mount shown in FIG. [Figure 14] FIG. 13 is an explanatory diagram showing the problem of the swivel mount shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] [Basic configuration] The basic structure of the free mounting base on which the present invention is based will be described below with reference to Figures 1 to 3. Figure 1 shows the appearance of the free mounting base according to the present invention, and corresponds to the state in which a fire detector 150 is not attached to the use state shown in Figure 12, with Figure 1(A) showing the state in which the detector mounting part 40 (mounting surface 42) faces downward, and Figure 1(B) showing the state in which the detector mounting part 40 (mounting surface 42) faces horizontally. Figure 2 shows the state in which the support part is connected to the base part shown in Figure 1, as seen from diagonally above, with the detector mounting part 40 not attached, and Figure 3 showing a cross section of the state shown in Figure 2.

[0029] As shown in Figures 1 to 3, the adjustable mounting base 10 is composed of a circular ring-shaped base 20 that is fixed to an installation surface (corresponding to the installation surface 100 in Figure 12), a support pole 30 whose one end is connected to the base 20, and a sensor mounting portion 40 that is connected to the other end of the support pole 30 and on which a fire sensor 150 (see Figure 12) is attached.

[0030] The base 10 has a circular base opening 22 formed in the center of the annular shape, and is provided with a pair of locking members 24 and a base mounting portion 26 at opposing positions across the base opening 22, and a number of rib members 28 that support the outer periphery 20A and bottom 20B of the base 10. A support column 30 is inserted into the base opening 22 from above (the installation surface side), and the support column 30 is connected to the base 10 by protruding downward from the base 10 without falling off as the flange portion 32 abuts against the peripheral edge portion 22A of the base opening 22. The locking member 24 locks the flange portion 32 of the inserted support column 30 to prevent it from coming off, and the base mounting portion 26 forms a screw hole for fixing the base 10 to the installation surface 100.

[0031] The support post 30 is inserted into the base opening 22 from above the base 10 and is connected so as to protrude vertically downward relative to the installation surface, and can be fixed in any orientation around the vertical axis relative to the base 10. A pair of connecting parts 44 of the sensor mounting part 40 are connected with bolts 50 to mounting holes 34 provided at the end (other end) on the lower side of the support post 30, allowing it to be fixed at any angle. The fire sensor 150 is attached to the mounting surface 42 of the sensor mounting part 40.

[0032] In addition, when inserted, the support portion 30 is rotatable around a vertical axis and is fixed after the angle is adjusted to a predetermined direction (fixing mechanism not shown); however, since the locking member 24 locks the flange portion 32, the support portion 30 is prevented from moving upward when the angle is adjusted.

[0033] [First embodiment] Next, a first embodiment of the swivel mount according to the present invention will be described with reference to Figures 4 and 5. Figure 4(A) shows the spacer assembled to the base (shown in imaginary lines) from the installation surface side, and Figure 4(B) shows it from the side. Also, Figure 5 shows the spacer of the first embodiment not assembled to the base as viewed from diagonally above.

[0034] 4 and 5, the spacer 60 of the first embodiment is formed of an elastic plate material such as stainless steel, and is assembled in pairs so as to surround each of the base mounting parts 26 of the base 20 into which the support parts 30 are inserted. When assembled to the base mounting parts 26, the spacer 60 is composed of a first surface 62 on the support part 30 side, a pair of second surfaces 64 bent at a substantially right angle to the first surface 62, a pair of third surfaces 66 further bent from both second surfaces 64, and a pair of spring pieces 68 provided on the installation surface sides of both second surfaces 64.

[0035] When the spacer 60 is assembled to the base mounting portion 26, the second surface 64 and the third surface 66 press the base mounting portion 26 so as to sandwich it, thereby holding it in place and preventing it from dropping or falling off during installation. When the base 20 is fixed to the installation surface, the upper side 62A of the first surface 62 of the spacer 60 contacts the installation surface, and the lower side 62B of the first surface 62 contacts the upper surface 32A of the flange portion 32 of the support portion 30, and the first surface 62 is sandwiched vertically between the installation surface and the upper surface 32A of the flange portion 32, thereby firmly fixing the support portion 30 to the installation surface.

[0036] The spring piece 68 of the spacer 60 acts to maintain the spacer 60 in a desired position and posture by being pressed from the installation surface by its elasticity and deformed when the base 20 is fixed to the installation surface by a screw inserted into a screw hole of the base mounting portion 26, but it is not essential and may be omitted. In addition, the upper side 64A and the lower side 64B of the second surface 64 are formed to have dimensions that do not hinder the first surface 62 from being sandwiched between the installation surface and the upper surface 32A of the flange portion 32.

[0037] In this embodiment, the "upper surface 32A of the flange portion 32 of the support portion 30," the "base mounting portion 26 of the base 20," the "second surface 64 and the third surface 66 of the spacer 60," the "upper edge 62A of the spacer 60," and the "lower edge 62B of the spacer 60" correspond to the "one end surface of the support portion," the "base engagement portion," the "spacer engagement portion," the "upper straight portion," and the "lower straight portion," respectively, described in the claims.

[0038] [Second embodiment] Next, a second embodiment of the swivel mount according to the present invention will be described with reference to Figures 6 and 7. Figure 6(A) shows the spacer assembled to the base (shown in imaginary lines) from the installation surface side, and Figure 6(B) shows it from the side. Also, Figure 7 shows the spacer of the second embodiment not assembled to the base as viewed from diagonally above.

[0039] 6 and 7, the spacer 70 of the second embodiment is formed of an elastic plate material such as stainless steel, and is assembled onto the flange 32 of the support column 30 so as to sandwich from the sides both base mounting portions 26 of the base 20 into which the support column 30 is inserted. When assembled to the base mounting portions 26, the spacer 70 is composed of a first surface 72 on the installation surface side, a pair of second surfaces 74 bent at a substantially right angle to the first surface 72, two pairs of third surfaces 76 further bent from both second surfaces 74, and guide pieces 78 provided on the underside of the third surfaces 76 at four locations.

[0040] When the spacer 70 is assembled to the base mounting portion 26, each of the third surfaces 76 elastically deforms and presses the base mounting portion 26 from the side, thereby holding the spacer 70 in place and preventing it from dropping or falling off during installation. When the base 20 is fixed to the installation surface, the upper surface 72A of the first surface 72 of the spacer 70 contacts the installation surface, and the lower side 74B of the second surface 74 contacts the upper surface 32A of the flange portion 32 of the support portion 30, and the first surface 72 and the second surface 74 are sandwiched vertically between the installation surface and the flange portion 32, thereby firmly fixing the support portion 30 to the installation surface.

[0041] The guide piece 78 of the spacer 70 functions as a guide for the insertion position of the third surface 76 when the spacer 70 is attached to the base attachment portion 26. In addition, an upper side 76A of the third surface 76 and a lower side 78B of the guide piece 78 are formed to have dimensions that do not hinder the first surface 72 and the second surface 74 from being sandwiched between the installation surface and the flange portion 32.

[0042] In this embodiment, the "upper surface 32A of the flange portion 32 of the support portion 30," the "base mounting portion 26 of the base 20," the "third surface 76 of the spacer 70," the "upper surface 72A of the spacer 70," and the "lower edge 74B of the spacer 70" respectively correspond to the "one end surface of the support portion," "base engagement portion," "spacer engagement portion," "upper flat portion," and "lower straight portion" described in the claims.

[0043] [Third embodiment] Next, a third embodiment of the swivel mount according to the present invention will be described with reference to Figures 8 and 9. Figure 8(A) shows the spacer assembled to the base (shown in imaginary lines) from the installation surface side, and Figure 8(B) shows it from the side. Also, Figure 6 shows the spacer of the third embodiment not assembled to the base as viewed from diagonally above.

[0044] 8 and 9, the spacer 80 of the third embodiment is made of an elastic plastic material such as polyacetal, and is assembled in pairs onto the flange 32 of the support part 30 so as to surround each of the base mounting parts 26 of the base 20 into which the support parts 30 are inserted. The spacer 80 is C-shaped (cylindrical with an open portion on the outer periphery of the base mounting part 26) before being assembled to the base mounting part 26, but becomes a flattened C-shape when assembled to the base mounting part 26.

[0045] When the spacer 80 is assembled to the base mounting portion 26, the upper and lower sides of the C-shape are pressed so as to be sandwiched between the respective side surfaces of the rib members 28 located on both sides of the base mounting portion 26, thereby preventing the spacer 80 from dropping or falling off during installation. When the base 20 is fixed to an installation surface, the upper surface 80A of the spacer 80 comes into contact with the installation surface and the lower surface 80B comes into contact with the upper surface 32A of the flange portion 32 of the support portion 30, and the spacer 80 is sandwiched vertically between the installation surface and the flange portion 32, thereby firmly fixing the support portion 30 to the installation surface.

[0046] In this embodiment, the following are defined: "upper surface 32A of flange 32 of support 30", "base attachment portion 26 of base 20 and rib members 28 located on both sides of base attachment portion 26", "spacer 80", "upper surface 80A of spacer 80", and "lower surface 80B of spacer 80". " correspond to "one end surface of the support portion," "base engaging portion," "spacer engaging portion," "upper flat portion," and "lower flat portion" respectively described in the claims.

[0047] [Fourth embodiment] Next, a second embodiment of the swivel mount according to the present invention will be described with reference to Figures 10 and 11. Figure 10(A) shows the spacer assembled to the base (shown in imaginary lines) from the installation surface side, and Figure 10(B) shows it from the side. Also, Figure 11 shows the spacer of the fourth embodiment not assembled to the base as seen obliquely from above.

[0048] 10 and 11, the spacer 90 of the fourth embodiment is made of an elastic plastic material such as polyacetal, and is assembled onto the flange 32 of the support column 30 so as to be surrounded by the inner circumferential surfaces of the base mounting portion 26 and the rib member 28 of the base 20 into which the support column 30 is inserted. The spacer 90 is C-shaped (cylindrical with an open portion overlapping with the locking member 24 and a recess 90C on the opposite side) when assembled to the base mounting portion 26, but has a more open C-shape before being assembled to the base mounting portion 26.

[0049] When the spacer 90 is assembled to the base mounting portion 26, the upper and lower sides of the C-shape are pressed so as to be sandwiched and held in place by the inner periphery of the rib members 28 positioned to surround the flange 32, thereby preventing the spacer from dropping or falling off during installation. Furthermore, when the base 20 is fixed to an installation surface, the upper surface 90A of the spacer 90 comes into contact with the installation surface and the lower surface 90B comes into contact with the upper surface 32A of the flange 32 of the support portion 30, and the spacer 90 is sandwiched vertically between the installation surface and the flange 32, thereby firmly fixing the support portion 30 to the installation surface.

[0050] The recess 90C of the spacer 90 is formed to avoid the locking member 24 when assembled, but is not required if the locking member 24 is omitted (in the first to fourth embodiments, a spacer is used, so the locking member 24 is not essential).

[0051] In this embodiment, the "upper surface 32A of the flange portion 32," the "rib member 28 of the base 20," the "spacer 90," the "upper surface 90A of the spacer 90," and the "lower surface 90B of the spacer 90" correspond to the "one end surface of the support portion," the "base engagement portion," the "spacer engagement portion," the "upper straight portion," and the "lower straight portion," respectively, described in the claims.

[0052] (others) The present invention is not limited to the above-described embodiment, but includes appropriate modifications that do not impair the objects and advantages of the present invention, and is not limited by the numerical values ​​shown in the above-described embodiment. [Explanation of symbols]

[0053] 10: Free-standing mounting base 20, 120: Base 22: Base opening 24: Locking member 26: Base mounting part 28: Rib member 30: Strut part 32: Tsuba section 34: Mounting hole 40: Sensor mounting part 42: Mounting surface 44: Connection 50: Bolt 60, 70, 80, 90: Spacer 62, 72: Front page 64, 74: 2nd side 66, 76: 3rd side 68: Spring piece 78: Guide piece 100: Installation surface

Claims

1. A base that is fixed to an installation surface; A support portion connected to an opening of the base with one end side exposed on the installation surface side of the base; a sensor mounting portion connected to the other end side of the support portion; a spacer arranged such that, in a state in which the base is fixed to the installation surface, a portion of one end side is in contact with the installation surface, and another portion of the one end side is deformed by pressure from the installation surface and in contact with the installation surface, and the other end side is in contact with one end surface of the support; A freely movable mounting base comprising:

2. A base that is fixed to an installation surface; A support portion connected to an opening of the base with one end side exposed on the installation surface side of the base; a sensor mounting portion connected to the other end side of the support portion; a spacer disposed in contact with both sides of the installation surface and one end surface of the support column when the base portion is fixed to the installation surface; Equipped with the base portion includes a base engaging portion that defines a position at which the spacer is disposed, The spacer has a spacer engaging portion that engages with the base engaging portion.

3. In the swivel mount according to claim 2, The base includes a plurality of the base engagement portions, The spacers are provided in the same number as the plurality of base engaging portions, The plurality of spacers are adapted to engage with the plurality of base engaging portions, respectively.

4. In the swivel mount according to claim 2, the base portion includes a plurality of base portion engaging portions at positions facing each other across the connected support portion, The spacer includes a plurality of the spacer engagement portions, A swivel mount, characterized in that the plurality of spacer engagement portions are engaged with corresponding ones of the plurality of base engagement portions.

5. In the swivel mount according to claim 4, The spacer is an installation surface side flat surface portion that comes into contact with the installation surface when the spacer engagement portion engages with the corresponding base engagement portion and the base is fixed to the installation surface; a support portion-side flat portion or a support portion-side straight portion that comes into contact with one end surface of the support portion when the spacer engagement portion is engaged with the corresponding base engagement portion; A connecting flat portion that is connected to the installation surface side flat portion and is connected to the support portion side flat portion or the support portion side straight portion; A freely movable mounting base comprising:

6. In the swivel mount according to claim 3 or 4, The spacer is characterized in that the spacer engaging portion engages with the corresponding base engaging portion and has an upper flat portion or an upper straight portion that contacts the installation surface when the base is fixed to the installation surface.

7. In the swivel mount according to claim 3 or 4, The spacer is characterized in that it has a lower flat portion or a lower straight portion that contacts one end face of the support portion when the spacer engagement portion is engaged with the corresponding base engagement portion.

8. In the swivel mount according to any one of claims 5 to 7, The movable mounting base is characterized in that the spacer engagement portion is elastically deformable, and when engaged with the base engagement portion, a force acts in a direction pressing the base engagement portion.

9. In the swivel mount according to claim 3 or 4, The swivel mount is characterized in that at least one opposing pair of the plurality of base engagement portions is arranged at a position for fixing the base to the installation surface.

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