JP7215889B2 - High ceiling lighting fixture - Google Patents

Description

The present invention relates to high ceiling lighting fixtures.

Lighting fixtures with hanging lamps are suspended from structures such as ceilings by chains or power supply cables themselves with increased tensile strength. A lighting fixture of this type has a problem that the lighting fixture shakes greatly due to an earthquake or the like, and may damage the surrounding equipment or the fixture itself. Therefore, the displacement body is fixed to the upper part of the suspension cord that suspends the lamp, the displacement body is horizontally displaceably supported, and the displacement body is guided to the center position of the displacement range by the weight of the lamp. A seismic isolation lighting fixture having a configuration that provides resistance to body displacement is known (see Patent Document 1, for example).

Japanese Patent No. 5821396

By the way, there is a possibility that a hanging type lamp that uses a flexible tube as a hanging member may be installed while the flexible tube or the like is bent. If the flexible tube or the like bends, the lighting fixture tilts and does not point straight down, so there is a risk that the intended lighting will not be possible. Even if the configuration of Patent Document 1 is adopted, although the upper end position of the hanger of the lamp can be guided to the central position in the horizontal direction, the inclination of the lamp itself cannot be suppressed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lighting fixture for a high ceiling that allows a lighting fixture to be directed vertically downward even if the flexible tube is installed in a bent state.

In order to achieve the above object, the present invention provides a lighting fixture for high ceilings having a hanging lamp, in which the lamp is suspended from the ceiling via a flexible member that generates a holding force capable of holding the bent state. A spherical joint is provided between the flexible member and the lamp so that the lamp can be maintained in a predetermined posture by the weight of the lamp without depending on the bending state of the flexible member.

In the above-described high-bay lighting fixture, the sliding resistance value of the spherical joint is set to a value capable of suppressing a change in posture of the lamp due to wind having a wind speed of at least 3.3 m/s.

In the high-bay lighting fixture, the flexible member has a multi-layered structure, and is a member that generates a bending moment resistance force that suppresses vibration due to inter-layer friction when bent.

In the high- bay lighting fixture, the flexible member has a bending moment resistance value of 0.8 Nm or more at the start of bending.

According to the present invention, in a lighting fixture having a hanger having a shape-retaining force such as a flexible tube, even if the hanger is installed with the hanger slightly bent during installation, the lamp can be directed vertically downward. Luminaires can be provided.

It is a figure which shows the installation state of the lighting fixture which concerns on embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; FIG. 2 is a diagram showing an example of a swinging range of a lamp 2 together with a peripheral configuration; FIG. 4 is a diagram showing the relationship between the bending angle near 0 degrees and the bending moment resistance value. FIG. 4 is a diagram showing the relationship between bending angles including 0 to 30 degrees and bending moment resistance values. It is a figure which shows the cross-sectional structure of a flexible tube. It is a figure which shows the cross-section of a heat-resistant electric wire cable. FIG. 10 is a diagram showing the relationship between bending angles including 0 to 30 degrees and bending moment resistance values in Example 3; FIG. 10 is a diagram showing the relationship between the bending angle near 0 degrees and the bending moment resistance value in Example 3;

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing an installation state of a lighting fixture according to an embodiment of the present invention.
This luminaire 1 is a high-ceiling luminaire suitably used by installing it on the ceiling surface of a factory, warehouse, gymnasium, etc., where the indoor ceiling height is higher than that of a general living room such as a dwelling unit or an office. Equipped with a lamp fixture 2 of the shape.
The lamp 2 is unitized so as to function as a light source of the lighting fixture, and includes a light source for illuminating the interior of the room. A known configuration can be widely applied to the configuration of the lamp 2 .

As shown in FIG. 1 , a hanging tool 4 is suspended from the ceiling 11 via metal ceiling fixtures 3 fixed to the ceiling 11 . The hanger 4 is a tubular member extending downward from the ceiling 11. The lamp 2 is supported at the lower end of the hanger 4, and a power supply line for supplying power to the lamp 2 passes through the inside of the hanger 4. do.

This hanger 4 has a flexible tube 6 . In this embodiment, as the flexible tube 6, a so-called "stand tube" used as a support for a desk lamp or the like is adopted. A "stand tube" is a type of flexible tube that generates a holding force that maintains the shape of the support column of the stand when it is bent.
The inventors used a flexible tube 6 having a predetermined shape-retaining force for the sling 4, and limited the shape-retaining force to a predetermined value as a bending moment resistance value, thereby realizing a seismic isolation lighting with a simple structure. Realized the instrument.
However, there is a possibility that the flexible tube 6 or the like having a shape retaining force may be installed while being bent. If the flexible tube 6 or the like is bent, the lamp 2 is tilted and does not face directly downward, so that the intended lighting cannot be achieved. Therefore, it is necessary to carefully adjust the inclination of the lamp 2 at the time of installation. Therefore, in this configuration, the spherical joint 12 that directs the lamp 2 directly downward by its own weight without depending on the bent state of the flexible tube 6 is adopted in order to eliminate the need for adjustment of the inclination of the lamp 2 with a simple structure at the time of installation. bottom. The peripheral configuration including the spherical hand 12 and the specifications of the flexible tube 6 and the like will be described below.

A configuration excluding the flexible tube 6 will be described.
A ceiling-side fixing portion 7 is integrally provided at the upper end of the flexible tube 6 , and a lamp-side fixing portion 8 is integrally provided at the lower end of the flexible tube 6 . The ceiling-side fixing portion 7 is fixed to the ceiling 11 so as not to swing by being fixed by fastening to a fastening target portion (not shown) provided on the ceiling fixing bracket 3 . A spherical joint 12 is provided between the lamp fixture side fixing portion 8 and the lamp fixture 2 .

FIG. 2 is a cross-sectional view showing the spherical joint 12 together with its peripheral configuration, and corresponds to the cross-sectional view taken along the line AA in FIG.
The spherical joint 12 has a ball portion 13 connected to the lower end of the lamp fixing portion 8 and a housing portion 14 slidable along the outer peripheral surface of the ball portion 13 .
The outer peripheral surface of the ball portion 13 is formed along the spherical convex surface.
The housing portion 14 includes an upper housing portion 14A having an upwardly convex cylindrical shape integrally provided on the upper surface of the lamp 2, and a lower housing portion 14B having a downwardly convex cylindrical shape formed separately from the upper housing portion 14A. It consists of The upper and lower housing portions 14A, 14B are connected to each other by a fastening member 15. As shown in FIG. As a result, as shown in FIG. 2, a housing portion 14 having an inner peripheral surface slidable along the outer peripheral surface of the ball portion 13 is formed. As indicated by the arrow, it is freely swingable with reference to the center position C1 of the sphere including the outer peripheral surface of the ball portion 13 .

FIG. 3 is a diagram showing an example of the swinging range of the lamp 2 together with the peripheral configuration.
By adjusting the size and shape of each part of the spherical joint 12 , the swinging range of the lamp 2 is set to a preset range, and falling off of the lamp 2 including the housing part 14 from the ball part 13 is regulated. This setting range (corresponding to the deflection angle of the lamp 2) is set to a maximum angle α (within the range of 5 to 10 degrees in this configuration) with respect to the vertical direction.
With this spherical joint 12, even if the lamp 2 is tilted obliquely, the lamp 2 swings downward due to the gravity acting on the lamp 2, so that the lamp 2 can be automatically directed directly downward. More specifically, the spherical joint 12 generates a slip resistance value (corresponding to the frictional resistance force between the ball portion 13 and the housing portion 14) smaller than the gravity acting on the lamp 2, thereby supporting the lamp 2. Rock downwards.

Further, the slip resistance value of the spherical joint 12 is set to a value capable of suppressing a change in the posture of the lighting fixture 2 due to the influence of wind having a wind speed of at least 3.3 m/s. As a result, it is possible to avoid a situation in which the tilt of the lamp 2 changes due to wind with a wind speed of 3.3 m/s or less.
Moreover, it is preferable that the resistance value such as the slip resistance value of the spherical joint 12 is set within a range that realizes a damper function that prevents the lamp 2 from continuing to sway and quickly stops the lamp 2 in a direct downward posture. .

With the above configuration, when the flexible tube 6 is installed while being bent, the lighting fixture 2 can be oriented directly downward (corresponding to vertically downward) without adjusting the angle of the flexible tube 6.
That is, a holding force capable of maintaining the bent state is generated between the flexible tube 6 and the lamp 2, and the posture (predetermined Since the spherical joint 12 is provided so that the flexible tube 6 can be maintained in a bent position, the lamp 2 can be oriented vertically downward.

In addition, since the deflection angle of the lamp 2 is regulated within the angle α, that is, within the range of ±5 degrees to 10 degrees at maximum in this example, the situation in which the lamp 2 is tilted by 10 degrees or more with respect to the flexible tube 6 is avoided. You can keep it looking good. It should be noted that if the lamp 20 is inclined by 10 degrees or more, it is preferable to correct the flexible tube 6 .
In addition, since the deflection angle of the lamp 2 can be suppressed within the above range when it is affected by external vibration such as an earthquake, there is also the advantage that damage to the lamp 2 and the like can be easily suppressed. The deflection angle of the lamp 2 may be set within an appropriate range according to the installation environment and the like.

Further, in the spherical joint 12 of this configuration, as shown in FIG. Only a range is formed. As a result, as shown in FIG. 3, the ball portion 13 and the housing portion 14 can be made compact, and the connection structure between the flexible tube 6 including the spherical joint 12 and the lamp 2 can be made compact. In addition, the spherical joint 12 is not limited to the structure shown in FIG. 3, and a widely distributed general-purpose spherical joint may be applied.

In this configuration, the ceiling-side fixing portion 7 , the flexible tube 6 , and the lamp-side fixing portion 8 composing the hanger 4 cover the power supply line for supplying power to the lamp 2 . Thus, the hanger 4 functions as a protective cover that covers and protects the power supply line.
The flexible tube 6 is formed of a tubular member having a multi-layered structure in which a special deformed wire is wound around the outer circumference of a winding layer in which a hard steel wire is wound, and functions as a flexible member having flexibility. When the flexible tube 6 is bent, frictional resistance is generated between the layers, thereby generating a holding force that maintains the bent state.

By the way, when an external vibration such as an earthquake acts on the lighting device 1, the hanging device 4 including the flexible tube 6 vibrates. It may vibrate like a pendulum with reference to a predetermined position X1 which is separated by LX.
Since the flexible tube 6 generates frictional resistance between the layers when it is bent, a bending moment resistance force is generated when it vibrates. The bending moment resisting force is a moment whose rotational direction is opposite to that of the bending moment, and acts as a force that suppresses vibration. The bending moment resistance force may also be referred to as bending resistance moment or simply resistance moment. This bending moment resistance value is referred to as the bending moment resistance value.

The inventors paid attention to the bending moment resistance value of the flexible tube 6 and studied specifications for suppressing the shaking of the lamp fixture 2 due to external vibrations such as earthquakes by using the flexible tube 6 .
In FIG. 1, reference character LC denotes the central axis when the hanging tool 4 is in a stationary state, and also the central axis of the flexible tube 6. As shown in FIG. In FIG. 1, the symbol θ is the bending angle of the hanger 4, and when the hanger 4 is in a stationary state, the bend angle θ=0 degrees. The bending angle θ of the hanger 4 matches the bending angle of the flexible tube 6 .

First, an example will be described.
In Example 1, the total length L1 of the lighting fixture is 1.0 m, the flexible portion length L2 of the flexible tube 6 is 550 mm, and the outer diameter of the flexible tube 6 is 21.5 mm.
In Example 2, the total length L1 of the lighting fixture is 2.0 m, the flexible portion length L2 of the flexible tube 6 is 1455 mm, and the outer diameter of the flexible tube 6 is 21.5 mm.

Vibration experiments were conducted on Examples 1 and 2 by applying vibrations corresponding to the Great Hanshin-Awaji Earthquake and the Great East Japan Earthquake, respectively. It was able to be suppressed to 500 mm or less.
If the deflection radius at the position of the lamp 2 is 500 mm or less, it will not come into contact with the adjacent lamp or wall surface during an earthquake, and there is no fear that fragments of the destroyed lamp 2 will fall on the floor.
In addition, in Examples 1 and 2 and each example described later, the shaking of the lamp 2 due to the spherical joint 12 is not taken into consideration.

Experiments were conducted to determine the bending moment resistance values of Examples 1 and 2. FIG. Specifically, a tension gauge was pressed against the lower end of the lamp 21 of Example 1 (position P1 800 mm from the upper end of the flexible tube 6), and the force and deformation state when the gauge was pressed horizontally were observed. Then, the bending angle θ of the flexible tube 6 is changed from 0 degrees to 30.0 degrees, and the force required to press down horizontally at each position is defined as the resistance strength (N), and from the upper end of the flexible tube to P1. The bending moment resistance value was calculated using the length of LX minus the distance of .

In addition, a tension gauge was pressed against the position P2 (corresponding to the lower side of the flexible tube 6) 1000 mm from the upper end of the flexible tube 6 of Example 2, and the force and deformation state when pressed horizontally were observed. Then, when the bending angle θ of the flexible tube 6 is changed from 0 degrees to 30.0 degrees, the force required to press down horizontally at each position is defined as the resistance strength (N), and (L3-LX). A moment resistance value was calculated as the effective length. Note that the value L3 is the length from the upper end of the flexible tube 6 to the position P2.
Table 1 shows the measurement results obtained by this experiment.

As shown in Table 1, in Example 1, the bending angle θ was in the range of 0 degrees to 30.0 degrees, and the bending moment resistance was in the range of 1.6 Nm to 12.9 Nm. However, when the bending angle .theta. Therefore, the bending moment resistance value when the bending angle θ is around 0 degrees was obtained by the method described later.

As shown in Table 1, in Example 2, the bending angle θ is in the range of 0 degrees to 30.0 degrees, and the bending moment resistance value is in the range of 2.2 Nm to 23.4 Nm. Excluding the bending angle θ of 0 degrees, the bending moment resistance was in the range of 4.7 Nm to 23.4 Nm when the bending angle θ was in the range of 5 degrees to 30.0 degrees.

As shown in Table 1, the bending moment resistance value tended to increase as the bending angle θ increased, and to increase as the suspension load (the weight of the flexible tube 6 + the weight of the lamp 2) increased.
Here, the heavier the lamp 2 is, the more difficult it is to suppress the shaking of the lamp 2 . As a result of studies by the inventors, it was found that by using the flexible tubes 6 of Examples 1 and 2, the amplitude LY can be suppressed within the allowable range if the weight of the lamp 2 is 4.0 kg or less.

4 and 5 are diagrams showing the relationship between the bending angle θ and the bending moment resistance value. 4 plots the experimental results of Examples 1 and 2 when the bending angle θ is in the range of 5 to 15 degrees, and FIG. 5 shows the results of Examples 1 and 2 when the bending angle θ is in the range of 5 to 30 degrees. Experimental results are plotted.
4 and 5, the characteristic curve f1 indicates the approximation characteristics of the first embodiment, and the characteristic curve f2 indicates the approximation characteristics of the second embodiment. FIG. 5 also shows the characteristic curve f3 of Reference Example 1 and the characteristic curve f4 of Reference Example 2. As shown in FIG. Reference Example 1 shows calculation results for a simple pendulum having the same pendulum conditions as in Example 1, except that the flexible tube 6 is not used. Reference Example 2 shows the calculation results of a simple pendulum that has the same pendulum conditions as in Example 2, except that the flexible tube 6 is not used.
As shown in FIGS. 4 and 5, the characteristic curves f1 and f2 are linear approximations of the experimental results and have little deviation from the experimental results. From this, it can be considered that the bending angle θ and the bending moment resistance value are proportional to each other by a linear function.

As shown in FIG. 4, by extending this characteristic curve f1 to the bending angle θ=0°, the bending moment resistance value near the bending angle θ of Example 1, that is, the bending moment resistance at the start of bending A value of 0.96 Nm was obtained.
Further, by extending the characteristic curve f2 to the bending angle θ=0°, the bending moment resistance value near the bending angle θ of Example 2, that is, the bending moment resistance value at the start of bending is 0.0°. A value of 96 Nm was obtained.

As a result of the above studies, in Example 1, the bending moment resistance value at the start of bending of the flexible tube 6 was 0.96 Nm, and the bending moment resistance value was found to be in the range of 3.2 Nm to 12.9 Nm.
Further, in Example 2, the bending moment resistance value at the start of bending of the flexible tube 6 was 0.96, and the bending moment resistance value was 4.0 when the bending angle θ was in the range of 5 degrees to 30.0 degrees. It was found to be in the range of 7 Nm to 23.4 Nm.
Other conditions were also examined, but for the flexible tube 6 with an outer diameter of 21.5 mm, a bending moment resistance value in the range of 0.8 Nm to 1.2 Nm at the start of bending is suitable for suppressing shaking. I found out. Moreover, the flexible tube 6 suitable for suppressing shaking had a bending moment resistance value of 50.0 Nm or less when the bending angle θ was in the range of 5 degrees to 30.0 degrees.

Reference Example 1 shows the result of calculating the bending moment resistance value using the formula F = -mg · sin θ of the force generated when the pendulum is swung by the bending angle θ that matches the bending angle θ (bent from the position directly below). , 2 in Table 1. When the weight of the lamp fixture 2 and the flexible tube 6 is applied to the mass m in the above equation, the bending moment resistance becomes zero when the bending angle θ is 0 degrees as shown in FIG. A straight line almost parallel to was obtained. Although this calculated value is actually a sine curve, it is almost straight in the range of 0 to 30 degrees. Note that g is the gravitational acceleration.

Naturally, such a simple pendulum model has no element for suppressing the swing. That is, it can be said that the reason why the amplitude can be suppressed when the lamp 2 is suspended using the flexible tube 6 is that the bending moment resistance value when the bending angle θ is 0 degree is 0.8 Nm or more.
When the lighting fixture 2 is suspended by a suspension member such as a chain that has a bending moment resistance value of almost zero when the bending angle θ is 0 degrees, the bending moment resistance value becomes the same as that of the above simple pendulum, resulting in an amplitude suppression effect. no.
Therefore, if a suspension member having a bending moment resistance value of 0.8 Nm or more when the bending angle θ is 0 degrees is used, the amplitude of an earthquake can be suppressed. Furthermore, it is possible to quickly stop the shaking of the lamp 2 after the earthquake subsides.

Further, the bending moment resistance value increases as the weight of the suspended portion including the lamp 2 increases. This acts as a force to return the lamp fixture 2 to the bending angle θ=0 degrees. In Examples 1 and 2, the single unit weight of the lamp was 3.0 kg, which was sufficiently effective in suppressing vibration. However, if weights are added to the lighting fixture 2 to be used to make it 4.0 kg or 5.0 kg, the inertial force increases when the bending angle θ returns to 0 degrees, making it difficult to stop the vibration. When using a hanging member with a bending moment resistance value of 0.8 Nm or more when the bending angle θ is 0 degrees, the amplitude is at the limit of the acceptable range at a lamp weight of 4.0 kg, and at 5.0 kg, the amplitude is 500 mm, which is the acceptable range. There was something beyond.

Combining the measurement results under different conditions, we used a hanging member with a bending moment resistance value of 0.8 Nm or more when the bending angle θ = 0 degrees measured when the length was 1.0 m without the lighting fixture. Then, the amplitude of the lamp 21 up to six times the bending moment resistance value when the total weight is the bending angle θ=0 degrees can be suppressed within the acceptable range. The total weight is the sum of the weights of all swinging parts, including the lighting fixture itself, suspension members, connection members, and the like.

The bending moment resistance value other than at the start of bending may also exceed the upper limit value of 23.4 Nm in Examples 1 and 2, but to the extent that deformation is not caused at the connecting portion between the suspension fixture 4 and the ceiling fixing bracket 3. must be kept within the range of
According to studies by the inventors, deformation of the joint between the suspension fitting 4 and the ceiling fixture 3 can be suppressed by suppressing the bending moment resistance value to 200 Nm or less with the lighting fitting 2 attached and the bending angle θ = 30 degrees. We have confirmed that it is possible to avoid
In Examples 1 and 2, the ceiling fixture 3 is formed by bending a sheet metal made of stainless steel and having a thickness of 2.0 mm. For example, if the ceiling fixing bracket 3 is designed to increase its rigidity by changing the plate thickness to 2.3 mm, it is possible to prevent the ceiling fixing bracket 3 from deforming even if a bending moment resistance value of 200 Nm or more is applied. be. However, if the plate thickness of the ceiling fixture 3 is unnecessarily increased, the weight of the lighting fixture as a whole increases and the commercial value decreases. Moreover, even if the ceiling fixture 3 is not deformed, the ceiling-side fixing portion 7 at the upper end of the flexible tube may be deformed or damaged. Conversely, when the bending moment resistance value at a bending angle of 30 degrees falls within 30 Nm, as in the flexible tube 6 used in Examples 1 and 2, the ceiling fixing bracket 3 used in Examples 1 and 2 is made thinner. It is also possible to configure with a sheet metal (for example, a plate thickness of 1.6 mm).

Next, the length of the hanger 4 will be considered. When the length of the pendulum composed of the hanging fixture 4 including the flexible tube 6 and the lighting fixture 2 is set to a value L (m), the period T (s) of the pendulum is T=2π(g/L) ^1/2 is known to be Here, π corresponds to the circumference ratio, and the length L corresponds to the length from the predetermined position X1 to the position of the center of gravity.
Table 2 shows an example of the period T of the lighting fixture 1 when the length L is changed.

Most of the actual seismic motions are "short-period ground motions" with a period of 1.0 seconds or less, but there are also "slightly long-period ground motions" with periods of 1.0 to 2.0 seconds. It is said that an earthquake motion with a period of about 1.0 to 2.0 seconds affects the collapse of a building. In order to suppress the shaking of the lighting fixture 2 also in the lighting fixture, it is also desired that the period T when the lighting fixture is considered in the pendulum model does not coincide with the period of the earthquake. That is, it is desirable to set the length L so that the period T of the pendulum does not coincide with the period of an earthquake. As can be seen from Table 2, lighting fixtures with a length L of 1.0 m or less have a period of natural vibration of 2.0 seconds or less, and may resonate with seismic motion. However, as a result of an experiment in which the lighting fixtures 1 of Examples 1 and 2 were subjected to vibrations simulating actual seismic motion and the shaking was observed, it was found that in the lighting fixtures 1 satisfying the configuration of the present invention, the shaking width of the lighting fixture 2 reached the limit value. A certain swing radius of 500 mm was not exceeded. As described above, the lighting fixture 1 using the configuration of the present invention can exhibit a sufficient effect of suppressing shaking even when the length L is set to 1.0 m or less and resonates due to an earthquake.
Further, by setting the length L to 1.2 m or more, the oscillation period becomes 2.2 seconds or more, and it is possible to set the period T to deviate from the earthquake period described above.

Further, when the length L is set to 1.2 m or more, it is observed that the flexible tube 6 resonates with double vibration (also referred to as secondary vibration) or triple vibration (also referred to as tertiary vibration). This is effective in suppressing the maximum amplitude LY of shaking. Of course, by adopting the configuration of the present invention, even in the hanging lighting fixture 1 having a sufficiently long length L, the swinging of the lighting fixture 2 can be further suppressed.

As described above, by using the flexible tube 6, which has a multi-layered structure and generates a bending moment resistance force that suppresses vibration due to inter-layer friction when bending, as the hanger 4 of the lighting fixture 1, the deflection extending in the oblique direction can be achieved. A lighting fixture 1 having a so-called seismic isolation function can be realized by suppressing the shaking of the lamp 2 without providing a stop wire.
More preferably, the bending moment resistance value at the start of bending of the flexible tube 6 is in the range of 0.8 Nm or more, so that vibration can be effectively suppressed. Moreover, since the flexible tube 6 is used, a special structure for generating bending moment resistance is not required.

In addition, the flexible tube 6 provides the characteristic that the bending moment resistance value increases linearly as the bending angle increases within the range of the bending angle θ of 30 degrees, so no special structure is required to obtain such characteristics. is.
In addition, by using the flexible tube 6 having a bending angle of 5 to 30 degrees and a bending moment resistance of 3.2 Nm to 50.0 Nm, the same bending moment resistance as in the above Examples 1 and 2 can be obtained. A value property is obtained.

In addition, by setting the maximum bending moment resistance to 200 Nm or less when the flexible tube 6 is bent 30 degrees with the lamp 2 attached, deformation of the joint between the suspension 4 and the ceiling fixture 3 is avoided. can.
Also, the swinging of the lamp 2 can be suppressed by making the period T of the pendulum composed of the suspension 4 including the flexible tube 6 and the lamp 2 not coincide with the period of the earthquake.

The structure in which interlayer friction occurs between the flexible tube 6 and the cable wire will be described in detail. FIG. 6 shows the cross-sectional structure of the flexible tube 6. As shown in FIG. The center of the tube 6 is hollow, and an inner tube 6A and an outer tube 6B are concentrically overlapped. Although both are not adhered, they are overlapped with an appropriate pressing force. When the flexible tube 6 is bent, the inner tube 6A and the outer tube 6B are slightly displaced, so that interlayer frictional resistance is generated at this time. As can be seen from the graph in FIG. 5, the value of the interlayer frictional resistance is almost constant in the range of 0 to 30 degrees, providing the same effect as a damper in a shock absorber.

FIG. 7 shows a cross-sectional structure of a 150 mm ² heat-resistant electric wire cable 16 used in the experiment instead of the flexible tube 6 in Examples 1 and 2 described above. In the central part, there is a conductive part 16A with a thickness of 150 mm ² made by twisting a thin copper wire, and its circumference is covered with an elastic resin cable 16B such as vinyl chloride or polyethylene. When the heat-resistant electric cable 16 is bent, frictional resistance occurs due to slippage between the copper wires, and at the same time, slippage occurs between the outer peripheral portion of the copper wire and the elastic resin cable, causing interlayer frictional resistance. The bending moment resistance value at 0 degrees is 0.8 Nm or more, which provides an amplitude suppression effect.

That is, even if the heat-resistant electric wire cable 16 shown in FIG. 7 is used instead of the flexible tube 6, the same effect as that of the flexible tube 6 can be obtained. However, when using the heat-resistant wire cable 16, the heat-resistant wire cable 16 of 150 mm ² used in the experiment has specifications that are not suitable for power supply, and unlike the flexible tube 6, the power supply wire cannot be passed through the inside, A separate power supply line had to be arranged along the heat-resistant wire cable 16 .

In Example 3, the flexible tube 6 of Example 1 is replaced with a heat-resistant wire cable 16 (hereinafter referred to as wire cable 16 as appropriate), and the other conditions are the same.
Under the same conditions as in Example 1, the bending moment resistance was measured every 5 degrees in the range of 0 to 30 degrees, and the results are shown in Table 3 and FIG. In addition, in FIG. 8, a characteristic curve f5 indicates an approximate characteristic.

In the case of Example 1, the relationship was linearly approximated as shown in FIG. 5, whereas in Example 3, the relationship was approximated by a quadratic curve. This is because the restoring force of the pendulum increases as the bending angle increases, and the electric cable 16 itself bends more, and the elastic resin of the outer shell tends to return the electric cable 16 to a straight line. It is thought that it is because it is added.
In the case of the electric wire cable 16, it is inappropriate to plot the relationship with the bending moment resistance value in the range of the bending angle θ of 5 degrees to 15 degrees as in the case of the first embodiment and linearly approximate it. Therefore, the bending moment resistance value was measured every 2 degrees in the range of 2 degrees to 10 degrees, assuming that the influence of the weight of the lamps and the like is as small as in Examples 1 and 2 and the electric cable 16 is hardly bent. The results are shown in Table 4 and FIG. Linear approximation of this measured value yielded a coefficient of determination (square of correlation coefficient) exceeding 0.99. By extending this characteristic curve to the bending angle θ=0°, a value of 0.89 Nm was obtained as the bending moment resistance value at the start of bending.

Also, the amplitude suppression effect can be obtained by using a multi-core cable.
In a multi-core cable, for example, ten conductive wires (copper wires) are individually coated with insulation, and ten elastic resin cables such as vinyl chloride or polyethylene are collectively covered with an outer elastic resin cable. When this multi-core cable is bent, a gap occurs between the copper wire and the inner cable, and at the same time, a gap occurs between the inner cable and the outer cable, causing interlaminar frictional resistance, and the overall bending at 0 degrees. The moment resistance value becomes 0.8 Nm or more, and an amplitude suppression effect is brought about.
When using a multi-core cable, any conductive wire in the multi-core cable may be used as a feeder line for supplying power to the lamp 2 .
In addition, if it is used as a power supply line to the lamp 2, a cable electric wire in which three electric wires with a cross-sectional area of 2 mm ² are bundled together is sufficient. Since the bending moment resistance value at a bending angle of 0 degrees is much smaller than 0.8 Nm in the cable wire of the specification, there is no effect of suppressing the shaking.

Thus, in this embodiment, it is possible to provide the lighting fixture 1 that has a seismic isolation function and that allows the lighting fixture 2 to be oriented vertically downward even when the flexible tube 6 is installed in a bent state. .
The above-described embodiment is merely an example of one aspect of the present invention, and can be arbitrarily modified and applied without departing from the scope of the present invention. For example, the hanger 4 may be directly attached to the ceiling 11 without using the ceiling fixture 3, and the constituent parts of the hanger 4 are not limited to the above-described modes.
In the above-described embodiment, the flexible tube 6 is provided between the ceiling-side fixing portion 7 and the lamp-side fixing portion 8 that constitute the upper and lower ends of the hanger 4 . A flexible tube 6 may be used for a portion between them, and a known pipe material having no bendability such as a metal pipe may be used for the remaining portion.

In addition, in the above-described embodiment, the case of using the flexible tube 6, the heat-resistant cable 16, or the multi-core cable has been described, but the present invention is not limited to this, and other flexible members that generate bending moment resistance to suppress vibration are used. You may

In the above-described embodiment, the flexible tube 6 is provided between the ceiling-side fixing portion 7 and the lamp-side fixing portion 8 that constitute the upper and lower ends of the hanger 4. At least about 100 mm may be made of the flexible tube 6, and the remaining portion may be made of a known non-flexible pipe material such as a metal pipe.
Furthermore, although the case where the present invention is applied to the lighting fixture 1 shown in FIG. 1 is exemplified, the present invention is not limited to this and may be applied to any lighting fixture having a hanging lamp.

Further, in the above-described embodiment, a case has been described in which the seismic isolation function is realized by making the hanger 4 to the above specifications, but the present invention is not limited to a configuration in which the hanger 4 has a seismic isolation function. In this case, by utilizing the effect that the spherical joint 12 allows the lighting fixture 2 to be oriented vertically downward even when the flexible tube 6 is installed in a bent position, even if the lighting fixture does not have a seismic isolation function, In addition, it is possible to facilitate the installation work of a lighting fixture that uses a hanging fixture whose bending moment resistance value at rest is not zero (has shape-retaining force).

1 lighting equipment 2 lamp 3 ceiling fixture 4 suspension 6 flexible tube (flexible member)
6A Inner tube 6B Outer tube 7 Fixing part on ceiling side 8 Fixing part on lamp fixture side 11 Ceiling 12 Spherical joint 13 Ball part 14 Housing part 16 Heat-resistant electric wire cable (flexible member)
16A Conductive part 16B Elastic resin cable LC Central axis when suspension fixture is stationary θ Bending angle L1 Overall length of lighting fixture L2 Flexible part length of flexible tube LY Amplitude f1, f2 Characteristic curve

Claims (4)

In lighting fixtures for high ceilings equipped with hanging lamps,
suspending the lamp from the ceiling via a flexible member that generates a holding force capable of holding the bent state;
For high ceilings , characterized in that a spherical joint is provided between the flexible member and the lamp, which maintains the lamp in a predetermined posture by the weight of the lamp without depending on the bending state of the flexible member. lighting equipment. 2. The high-ceiling use according to claim 1, wherein the slip resistance value of the spherical joint is set to a value capable of suppressing a change in posture of the lamp due to the influence of wind having a wind speed of at least 3.3 M/S. lighting equipment. 3. The high-ceiling lighting fixture according to claim 1, wherein the flexible member has a multi-layered structure, and is a member that generates a bending moment resistance force that suppresses vibration due to inter-layer friction when bent. 4. The high-ceiling lighting fixture according to claim 1, wherein the flexible member has a bending moment resistance value of 0.8 NM or more at the start of bending.

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