Support

Abstract

To provide a support fixture capable of suppressing breakage due to vibration.SOLUTION: The support fixture includes a first support suspended from an object, a second support attached to a lower end portion of the first support for supporting a load, and a movable portion attached to the first support. Preferably, the movable portion is provided in at least one of upper and lower end portions of the first support. More preferably, the movable portion includes a damping portion for damping vibrations. Further preferably, a movement control mechanism for fixing or unfastening the movable portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present technology relates to a support that is suspended from an object, for example, a ceiling, and supports a load, and in particular to a support that is earthquake-resistant and can continue to support a load even when repeated loads are applied. [Background technology]

[0002] There is a cable wiring facility in which a cable rack is attached to the lower end of a suspension support suspended from the ceiling, and wiring to the ceiling is realized by the cable wiring facility (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-108532 Summary of the Invention [Problem to be solved by the invention]

[0004] When large vibrations, such as those caused by earthquakes, i.e., impact forces and repeated loads, act on cable wiring facilities, the suspension supports may be damaged. For example, the suspension supports may break or deform (residual displacement), and the cable rack may fall.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a support that can suppress breakage due to vibration. [Means for solving the problem]

[0006] A support device according to one embodiment of the present disclosure comprises a first support suspended from an object, a second support attached to the lower end of the first support and supporting a load, and a movable part attached to the first support.

[0007] In one embodiment of the present disclosure, by providing a movable part, when vibration acts on the movable part, the movable part moves and the vibration is suppressed.

[0008] In the support device according to one embodiment of the present disclosure, the movable portion is provided on at least one of the upper end and the lower end of the first support body.

[0009] In one embodiment of the present disclosure, vibration of the first support or the second support can be suppressed.

[0010] In a support device according to one embodiment of the present disclosure, the movable part includes a damping part that damps vibrations.

[0011] In one embodiment of the present disclosure, vibrations are damped by the damping section.

[0012] A support device according to one embodiment of the present disclosure includes a movement control mechanism that locks or unlocks the movable part.

[0013] In one embodiment of the present disclosure, when suspending the first support from an object or when connecting the first support and the second support, the movable part can be fixed by the movement control mechanism to improve workability. Furthermore, after the support is attached to the object, the movement control mechanism can release the fixed movable part, thereby suppressing vibration acting on the support.

[0014] In a support device according to one embodiment of the present disclosure, the movable portion includes a rotation fulcrum portion.

[0015] In one embodiment of the present disclosure, the rotational fulcrum causes the first support or the second support to move in response to vibration.

[0016] A support according to one embodiment of the present disclosure includes a plurality of the first supports attached to the second support at intervals.

[0017] In one embodiment of the present disclosure, the second support is supported by a plurality of first supports, so the weight of the load is distributed to each of the first supports, which makes it easier to increase the load-bearing capacity of the support device.

[0018] In the support device according to one embodiment of the present disclosure, the first support includes a bolt or a wire.

[0019] In one embodiment of the present disclosure, by using a bolt as the first support, the object and the second support can be easily connected to the first support by screwing. By using a wire as the first support, it becomes easier to suppress vibrations acting on the support.

[0020] In a support device according to one embodiment of the present disclosure, a belt is provided on the wire, extending in a direction intersecting the axial direction of the wire.

[0021] In one embodiment of the present disclosure, the provision of a belt prevents the wire from bowing due to vibration, making it easier to suppress vibration of the wire.

[0022] In the support according to one embodiment of the present disclosure, the second support comprises a rack, a conduit, a pull box, a bus duct, a metal duct, a metal wire pipe, or a lighting support.

[0023] In one embodiment of the present disclosure, the load can be easily accommodated by using racks, conduits, pull boxes, bus ducts, metal ducts, metal wire rods or lighting fixtures. [Effects of the Invention]

[0024] In a support according to an embodiment of the present disclosure, by providing a movable part, when vibrations act on the support, the movable part moves, making it possible to suppress vibrations of the support. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic perspective view of a support according to a first embodiment. [Figure 2] FIG. [Figure 3] FIG. 2 is a longitudinal cross-sectional view illustrating a configuration in the vicinity of a ball joint. [Figure 4] FIG. 1 is an explanatory diagram illustrating a test method. [Figure 5A] 10 is a graph showing the frequency and PSD value of the support when a sweep wave is input to the shaking table. [Figure 5B] 10 is a graph showing the frequency and PSD values ​​of the comparative support when a sweep wave is input to the shaking table. [Figure 6A] 1 is a graph showing the input acceleration of a sine wave input to a shaking table and the response acceleration of a support tool. [Figure 6B] 10 is a graph showing the input acceleration of a sine wave input to a vibration table and the response acceleration of a comparative support tool. [Figure 7] FIG. 10 is a simplified front cross-sectional view of a support according to a second embodiment. [Figure 8] FIG. 10 is a schematic perspective view of a wire and a belt according to a modified example in which the configuration is partially modified. [Figure 9] FIG. 11 is a schematic perspective view of a support according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] (Embodiment 1) The present invention will be described below with reference to the drawings showing a support device 10 according to a first embodiment. In the following description, the directions up, down, front, back, left, and right shown in the drawings will be used as appropriate. FIG. 1 is a schematic perspective view of support device 10, and FIG. 2 is a schematic front cross-sectional view of support device 10. Support device 10 comprises four first supports 1 and a second support device 2. Each first support device 1 is a rod with a thread formed on its entire periphery, a so-called fully threaded bolt, and is suspended from a supporting object 50 such as a ceiling or beam. The number of first supports 1 is not limited to four, and may be three or less, or five or more. The upper end of each first support device 1 is connected to supporting object 50 via a ball joint 3.

[0027] The second support 2 has a rectangular plate shape and is arranged approximately horizontally. The lower ends of the four first supports 1 are connected to the four corners of the second support 2 via ball joints 3. Note that the ball joints 3 are an example of a movable part and a rotation fulcrum part, and the first support 1 and the supported object 50, or the first support 1 and the second support 2, may be connected by a movable part other than the ball joint 3, for example, a movable joint such as a universal joint. The ball joints 3 enable the second support 2 to move within a horizontal plane, and can move in two directions, for example, forward / backward and left / right.

[0028] FIG. 3 is a longitudinal cross-sectional view schematically illustrating the configuration near ball joint 3. Note that the configuration illustrated in FIG. 3 is one example of the configuration of ball joint 3, and the configuration of ball joint 3 is not limited to this. Ball joint 3 includes a cylindrical body 31 with a bottom. A male thread 31b is formed on the outer peripheral surface of body 31. A female thread 31a is formed on the inside of one end of body 31. A support base 32 protrudes axially outward from the other end of body 31. Support base 32 is a disk with a smaller diameter than body 31 and is disposed coaxially with body 31. Support base 32 supports spring seat 33. Spring seat 33 is disc-shaped and has a smaller diameter than body 31. One or more disc springs 34 are held in spring seat 33. Disc spring 34 is an example of a damping portion, and disc spring 34 may be replaced with a coil spring or an elastic resin member such as rubber.

[0029] The spring seat 33 and the disc spring 34 are housed in a cylindrical storage section 35. The spring seat 33 and the disc spring 34 are arranged on one end side of the storage section 35. A flange 35a is formed on one end side of the storage section 35. The diameter of the flange 35a is approximately the same as the diameter of the body 31. A ball 36 is housed in a rollable manner on the other end side of the storage section 35. The diameter of the other end of the storage section 35 becomes smaller as it approaches the other end. The diameter of the other end of the storage section 35 is smaller than that of the ball 36. In other words, the ball 36 cannot slip out of the other end opening of the storage section 35.

[0030] A shaft portion 37 is connected to the ball 36. The shaft portion 37 protrudes axially outward from the other end opening of the storage portion 35. A female screw 37a is formed on the shaft portion 37 on the opposite side of the ball 36 in the axial direction.

[0031] The storage section 35 and the body 31 are disposed inside the adjustment nut 39. An annular protrusion 39a protruding radially inward is formed at one end of the adjustment nut 39. The diameter of the protrusion 39a is substantially the same as that of the flange 35a and the body 31. The adjustment nut 39 is disposed so that the flange 35a is disposed between the protrusion 39a and the body in the axial direction. The adjustment nut 39 is coupled to the male thread 31b of the body 31. By tightening the adjustment nut 39 toward the body 31, the protrusion 39a moves the flange 35a toward the body 31, tightening the ball 36 and fixing the ball joint 3. By loosening the adjustment nut 39, the tightening of the ball 36 is loosened and the fixation of the ball joint 3 is released. The storage section 35, adjustment nut 39, and body 31 constitute a movement control mechanism.

[0032] FIG. 3 shows a state in which the first support body 1 and the second support body 2 are connected by a ball joint 3. A through hole 2a is formed in the second support body 2, penetrating vertically. The ball joint 3 is placed above the through hole 2a, with the body 31 on the bottom and the shaft 37 on the top. A bolt 40 is inserted into the through hole 2a from below, and the bolt 40 and the female thread 31a of the body 31 are coupled. The lower end of the first support body 1 (fully threaded bolt) is coupled to the female thread 37a of the shaft 37.

[0033] The connection between the supporting object 50 and the first support body 1 is also performed in the same way by turning the ball joint 3 upside down. That is, the ball joint 3 is placed below a through-hole formed in the supporting object 50, with the body 31 on the upper side and the shank 37 on the lower side. A bolt is inserted into the through-hole from above, and the bolt and the internal thread 31a of the body 31 are coupled. The upper end of the first support body 1 (fully threaded bolt) is coupled to the internal thread 37a of the shank 37.

[0034] Loads such as electric cables, water pipes, and outdoor units of air conditioners are placed on the second support 2. When large vibrations, such as an earthquake, act on the support 10, the ball joint 3 moves, suppressing the vibrations of the support 10. This prevents damage to the support 10 and prevents the load from falling and breaking.

[0035] A vibration test was conducted on the support 10. Note that the vibration test described below is an example, and other vibration test methods are not limited to this. FIG. 4 is an explanatory diagram illustrating the test method. A support 58 is provided on a vibration table 51, and the support object 50 is supported by the support 58. The support 10 is suspended from the support object 50. Note that the length of the first support 1 of the support 10 is 490 mm, and the second support 2 is a square with sides of 300 mm, made of stainless steel with a thickness of 8 mm and a weight of 5700 g.

[0036] A first acceleration sensor 61 is provided on the vibration table 51. An actuator 52 is connected to the vibration table 51. The driving of the actuator 52 is controlled by a control device 53. An AC voltage signal having a desired frequency and waveform, i.e., a test signal, is input to the control device 53 from a function generator 54. Based on the test signal, the control device 53 drives the actuator 52 to vibrate the vibration table 51.

[0037] A second acceleration sensor 62 is provided on the second support 2. The first acceleration sensor 61 and the second acceleration sensor 62 detect acceleration caused by vibration of the vibration table 51. The first acceleration sensor 61 and the second acceleration sensor 62 output their detected values ​​to an amplifier 55. The amplifier 55 amplifies the detected value and outputs it to a measuring device 56. The measuring device 56 measures the acceleration and outputs it to a PC 57.

[0038] The following describes the case where a sweep wave of 0.2 to 10 Hz is input to the vibration table 51. The PC 57 calculates the frequency and power spectral density function (PSD) values ​​of the support 10 based on the detection value of the second acceleration sensor 62. The PSD value is a value corresponding to the amplitude, i.e., the response. FIG. 5A is a graph showing the frequency and PSD values ​​of the support 10 when a sweep wave is input to the vibration table 51. As shown in FIG. 5A, the PSD value (response), i.e., the natural frequency, of the support 10 was not detected. It is believed that the vibration of the support 10 was sufficiently suppressed by the ball joint 3.

[0039] Although not shown in the figure, when the ball joint 3 is provided only at the upper end of the first support 1, the natural frequency of the support 10 is detected as 3.1 Hz, and its PSD value (response) is 10 5 It is believed that the vibration of the support 10 was suppressed to some extent.

[0040] 5B is a graph showing the frequency and PSD value of the comparative support when a sweep wave is input to the vibration table 51. Unlike the support 10 according to the first embodiment, the comparative support does not use a ball joint 3. As shown in FIG. 5B, the natural frequency of the comparative support was detected to be 6.8 Hz, and its PSD value (response) was 10 6 That was about it.

[0041] Maximum input acceleration of 6.46 m / s on shaking table 51 2 The following describes the case where a sine wave of 0.42 m / s is input. The PC 57 calculates the input acceleration of the sine wave based on the detection value of the first acceleration sensor 61, and calculates the response acceleration of the support 10 based on the detection value of the second acceleration sensor 62. Fig. 6A is a graph showing the input acceleration of the sine wave input to the vibration table 51 and the response acceleration of the support 10. As shown in Fig. 6A, the response acceleration is 0.42 m / s 2 The magnitude of the response acceleration is small relative to the input acceleration, with a response magnification of 6.5%. It is considered that the vibration of the support 10 was sufficiently suppressed by the ball joint 3.

[0042] Although not shown in the figure, when the ball joint 3 is provided only at the upper end of the first support 1, the maximum input acceleration is 0.31 m / s 2 At this time, the response acceleration is 0.11m / s 2 The magnitude of the response acceleration is small relative to the input acceleration, with the response magnification being 36.7%. It is considered that the vibration of the support 10 was sufficiently suppressed by the ball joint 3.

[0043] For comparison, the maximum input acceleration on vibration table 51 is 0.26 m / s 2 6B is a graph showing the input acceleration of the sine wave input to the shaking table 51 and the response acceleration of the comparative support. As shown in FIG. 6B, the magnitude of the response acceleration is large relative to the input acceleration, with a response magnification of 776.0%.

[0044] In the support 10 according to the first embodiment, by providing a movable part, when vibration acts on the support 10, the movable part moves, and vibration of the support 10 can be suppressed.

[0045] Furthermore, by providing movable parts at the upper and lower ends of the first support 1, it is possible to suppress vibration of the first support 1 or the second support 2. Furthermore, by providing a damping part, vibration is damped.

[0046] Furthermore, when connecting the first support 1 to the supporting object 50, or when connecting the first support 1 and the second support 2, the movable part can be fixed by the movement control mechanism, improving workability. After the support 10 has been attached to the object, the fixed movable part can be released by the movement control mechanism, thereby suppressing vibrations acting on the support 10.

[0047] Furthermore, since the second support 2 is supported by a plurality of first supports 1, the weight of the load is distributed to each of the first supports 1, which makes it easier to increase the load-bearing capacity of the support 10. Furthermore, by using fully threaded bolts as the first supports 1, the supported object 50 and the second supports 2 can be easily connected to the first supports 1 by screwing them together.

[0048] In the first embodiment, a case where the movable part is provided at the upper and lower ends or the upper end of the first support 1 has been described, but the movable part may be provided only at the lower end of the first support 1. Also, the movable part may be provided in the middle of the first support 1.

[0049] (Embodiment 2) The present invention will be described below with reference to the drawings showing a support 10 according to a second embodiment. Of the configuration according to the second embodiment, the same configuration as in the first embodiment is given the same reference numerals, and detailed description thereof will be omitted. FIG. 7 is a simplified front cross-sectional view of the support 10. In the second embodiment, a wire 11 is used as the first support 1 instead of a fully threaded bolt. A resin belt 12 is attached to the wire 11. The belt 12 protrudes from the wire 11 in a direction intersecting the axial direction of the wire 11.

[0050] In the second embodiment, the use of wire 11 as first support 1 makes it easier to suppress vibrations acting on support tool 10. Furthermore, the provision of belt 12 prevents wire 11 from becoming bowed due to vibrations, making it easier to suppress vibrations of wire 11.

[0051] 8 is a schematic perspective view of the wires 11a and belt 12a according to a modified example in which the configuration is partially changed. The wires 11a may be provided inside the belt 12a. That is, a plurality of wires 11a may be molded with a resin material to form a belt 12a in which the wires 11a are embedded, and this belt 12a may be used as the first support 1.

[0052] (Embodiment 3) The present invention will be described below with reference to the drawings showing a support 10 according to a third embodiment. In the third embodiment, the configuration is the same as that of the first embodiment except for the configuration of the second support 2. Of the configurations according to the third embodiment, the same configurations as those in the first embodiment are given the same reference numerals and detailed description thereof will be omitted. Fig. 9 is a schematic perspective view of the support 10.

[0053] The second support body 2 includes a rack 21, a rack support portion 22, and a connecting member 23. The rack 21 is ladder-shaped and includes two substantially parallel pillars 21a and a plurality of crosspieces 21b arranged between the two pillars 21a and substantially perpendicular to the pillars 21a. The two pillars 21a extend in the front-rear direction. The plurality of crosspieces 21b are arranged at substantially equal intervals along the front-rear direction and connect the two pillars 21a. In the vertical direction, the crosspieces 21b are arranged below the center of the pillars 21a. In other words, when the rack 21 is viewed from the front-rear direction, the rack 21 is substantially U-shaped with the crosspieces 21b at the bottom. Loads such as electrical cables are mainly placed inside the rack 21.

[0054] The rack support portion 22 is pillar-shaped and extends left and right. Both ends of the rack support portion 22 are connected to the lower ends of two first supports 1 arranged on the left and right via ball joints 3. The rack 21 is placed above the rack support portion 22 so that the pillar portions 21a and the rack support portion 22 are perpendicular to each other in a plan view.

[0055] The connecting members 23 are crank-shaped and are provided on the left and right sides of the rack support portion 22. The connecting members 23 are arranged along the upper and side surfaces of the pillar portions 21a and the upper surface of the rack support portion 22. The connecting members 23 are fixed to the rack support portion 22 with bolts. The pillar portions 21a are sandwiched between the connecting members 23 and the rack support portion 22. In other words, the connecting members 23 connect the rack support portion 22 and the pillar portions 21a. Using the rack 21 makes it easier to store a load. Furthermore, using the rack support portion 22 makes it possible to support the rack 21.

[0056] The second support 2 may include a conduit, a bus duct, or a metal duct instead of the rack 21. The conduit, bus duct, or metal duct stores a load, such as an electric wire. In this case, a support part for supporting the conduit, bus duct, or metal duct, and a connecting member for connecting the support part to the conduit, bus duct, or metal duct are used. Note that the rack 21, conduit, bus duct, or metal duct may be directly supported by the ball joint 3 without using a support part or connecting member.

[0057] The second support 2 may be provided with a pull box, a metal wire pipe, or a lighting support instead of the rack 21. The pull box and the metal wire pipe store a load, such as an electric wire or cable. The lighting support supports a light (load). The pull box, the metal wire pipe, or the lighting support is directly supported by the ball joint 3. Note that the pull box, the metal wire pipe, or the lighting support may be indirectly supported using a support portion and a connecting member, etc., similar to the rack 21.

[0058] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all modifications within the scope of the claims and the scope equivalent to the claims. [Explanation of symbols]

[0059] 1 First support 2 Second support 3 Ball joint (movable part, rotation fulcrum part) 10 Supports 11, 11a wire 12, 12a Belt 50 Supporting object 34 Disc spring (damping part) 35 Storage section (movement control mechanism) 39 Adjustment nut (movement control mechanism) 31 Fuselage (movement control mechanism)

Claims

1. a first support suspended from the object; a second support attached to a lower end of the first support and configured to support a load; a movable portion attached to the first support; a movement control mechanism that fixes or releases the movable part; Equipped with Support.

2. A first support suspended from an object; a second support attached to a lower end of the first support and configured to support a load; a movable part attached to the first support; Equipped with The first support includes a wire. Support.

3. The movable portion is provided at least one of an upper end portion and a lower end portion of the first support. The support according to claim 1 or 2.

4. The movable part is provided with a damping part that damps vibrations. A support according to any one of claims 1 to 3.

5. The movable portion includes a rotation fulcrum portion. A support according to any one of claims 1 to 4.

6. a plurality of the first supports; The plurality of first supports are attached to the second support at intervals. A support according to any one of claims 1 to 5.

7. The wire is provided with a belt extending in a direction intersecting the axial direction of the wire. The support of claim 2 .

8. The second support may include a rack, a conduit, a pull box, a bus duct, a metal duct, a metal wire rod, or a lighting support. A support according to any one of claims 1 to 7.

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