JP7475240B2 - lighting equipment - Google Patents

Description

This disclosure relates to lighting fixtures, and in particular to the internal cable fixing structure.

Conventionally, lighting fixtures used inside tunnels and the like have cables pulled from the outside into the housing. The cables are connected to a power terminal block installed inside the housing. For example, when a train such as a bullet train passes through a tunnel, the cable may sway due to vibrations caused by the train's movement or wind pressure. The cable sway is also transmitted to the part of the lighting fixture where it is pulled in. The cable vibrations are transmitted to the power terminal block, and tension is applied to the connection between the power terminal block and the cable.

A conventional lighting fixture is known in which a movement restricting device is fixed to the power supply line to the main part of the device, which is placed inside the housing, and is crimped to the power supply line by a force acting in the radial direction of the power supply line. The movement restricting device is sized so that it cannot pass through the power supply line insertion hole provided in the housing. If the housing and the main part of the device fall off the equipment mounting target due to damage to the fixing means, etc., the housing engages with the movement restricting device. And, by engaging the movement restricting device with the housing, tension is not directly applied to the connection between the power terminal block and the cable (for example, see Patent Document 1).

JP 2016-127229 A

However, in the lighting fixture described in Patent Document 1, the movement restriction device is fixed by clamping the cable, which is the power supply line, with two clamping parts. The movement restriction device is attached so as to surround the outer periphery of the cable covered with a sleeve, and is fixed to the cable by screwing it in. The task of fixing the movement restriction device to the cable increases the work time of construction workers. In addition, the task of fixing the movement restriction device to the cable in a dark environment, such as inside a tunnel, requires work such as searching for the parts to attach and checking whether the movement restriction device is securely fixed, which makes the work time difficult.

This disclosure has been made to solve the problems mentioned above, and aims to provide a lighting fixture that makes it easier to secure the cable that is pulled into the housing from the outside.

A lighting fixture according to the present disclosure includes a housing, a power terminal block disposed inside the housing, a cable that is drawn from the outside of the housing to the inside and connected to the power terminal block, and a plurality of protrusions that fix the cable to a frame that is a part of the housing between an inlet of the housing through which the cable is drawn and the power terminal block, the plurality of protrusions including two first protrusions that protrude from the frame and are disposed at a position closest to the power terminal block, and a second protrusion that is disposed on the side where the inlet is located relative to the first protrusions, and The spacing is smaller than the outer diameter of the cable, the cable is arranged passing between the two first protrusions and between the first protrusions and the second protrusions , each of the multiple protrusions has a tip and a maximum outer diameter portion located halfway in the height direction from the surface of the frame to the tip, and the side surfaces of the multiple protrusions have a first inclined surface formed so that the outer diameter widens from the surface toward the maximum outer diameter portion and a second inclined surface formed so that the outer diameter narrows from the maximum outer diameter portion toward the tip, and the cable is clamped between the first inclined surface and the frame .

According to the present disclosure, the cable is secured by multiple protrusions, so that even if vibrations from the cable are transmitted from outside the housing, no tension is applied to the connection between the power terminal block and the cable, preventing damage to the connection and allowing the cable to be secured easily.

1 is a perspective view of a lighting device 100 according to a first embodiment. 2 is a perspective view of the lighting fixture 100 shown in FIG. 1 with a light-emitting unit cover 20 removed. FIG. FIG. 3 is a perspective view of the lighting device 100 of FIG. 2 with a light-emitting unit 21 removed. FIG. 4 is a plan view of the lighting fixture 100 of FIG. 3. FIG. 5 is an enlarged view of the fixing portion 11 in FIG. 4 . FIG. 6 is a side view of the fixing portion 11 shown in FIG. 5 . FIG. 6 is a side view of the fixing portion 11 shown in FIG. 5 .

Below, an embodiment of the present disclosure will be described with reference to the drawings. In each drawing, the same or corresponding parts are given the same reference numerals, and their description will be omitted or simplified as appropriate. In addition, the shape, size, arrangement, etc. of the configurations shown in each drawing may be changed as appropriate.

Embodiment 1.
Fig. 1 is a perspective view of a lighting device 100 according to a first embodiment. Fig. 2 is a perspective view of the lighting device 100 shown in Fig. 1 with a light-emitting unit cover 20 removed. Fig. 3 is a perspective view of the lighting device 100 shown in Fig. 2 with a light-emitting unit 21 removed. The lighting device 100 illuminates the surroundings with the light-emitting unit 21 installed inside a housing 60. As shown in Fig. 1, the lighting device 100 includes a housing 60 that is elongated in one direction. The housing 60 includes a light-emitting unit cover 20 and a frame 30.

As shown in Figures 1 and 2, the light-emitting unit cover 20 covers the light-emitting unit 21 installed inside the housing 60 and is configured to allow light from the light-emitting unit 21 to pass through. The light-emitting unit cover 20 also protects the internal light-emitting unit 21 from flying objects such as stones.

As shown in Figs. 1 to 3, the light-emitting unit cover 20, the light-emitting unit 21, and the power supply unit 22 are attached to the frame 30. The frame 30 is also fixed to a mounting fixture 40. The mounting fixture 40 is fixed to a structure such as a wall in a tunnel, a wall of a building, or a pillar, for installing the housing 60 on the structure. The housing 60 and mounting fixture 40 are not limited to the form shown in Figs. 1 to 3, and can be appropriately changed in shape depending on the structure to which they are attached.

The light-emitting unit 21 is, for example, an LED lamp. The light-emitting unit 21 is connected to a power supply device 22 fixed to the frame 30. The power supply device 22 supplies electricity to the light-emitting unit 21.

Figure 4 is a plan view of the lighting device 100 of Figure 3. Figure 4 is a plan view of the lighting device 100 with the light-emitting unit cover 20 and the light-emitting unit 21 removed. The power supply unit 22 is connected to an external power source by a cable 10, and electricity is supplied via the cable 10. The frame 30 is formed with an inlet 12, which is an opening for drawing the cable 10 into the inside of the housing 60. The cable 10 is inserted into the housing 60 from the inlet 12, and is wired along the surface 31 of the frame 30 to the power supply unit 22. The inlet 12 is a hole large enough for the cable 10 to pass through, and is preferably configured so that the gap is filled with, for example, a rubber packing.

As shown in FIG. 4, the power supply unit 22 is installed in the center of the frame 30 of the lighting fixture 100 in the longitudinal direction. The cable 10 is wired from the inlet 12 along the surface 31 of the frame 30. The cable 10 passes between the light-emitting unit 23 and the surface 31 of the frame 30, and is connected to the power terminal block 24 of the power supply unit 22 via the fixing part 11. The fixing part 11 fixes the cable 10 between the power terminal block 24 and the inlet 12. Since the cable 10 is fixed to the fixing part 11 between the power terminal block 24 and the inlet 12, even if vibration of the cable 10 is transmitted from outside the housing 60, the vibration is not directly transmitted to the connection part with the power terminal block 24. In addition, even if a load is applied to the cable 10 outside the housing 60, the load can be received by the fixing part 11, and the load is not directly applied to the connection part between the power terminal block 24 and the cable 10.

Figure 5 is an enlarged view of the fixing portion 11 in Figure 4. In the first embodiment, the fixing portion 11 is composed of a plurality of protrusions 50 protruding from the surface 31 of the frame 30. The plurality of protrusions 50 includes three types: a first protrusion 50a arranged on the side closest to the power supply terminal block 24, a second protrusion 50b arranged on the side where the inlet 12 is located relative to the first protrusion 50a, and a third protrusion 50c arranged closest to the side where the inlet 12 is located. However, the plurality of protrusions 50 may be composed of even more protrusions 50.

There are two first protrusions 50a, which are arranged in parallel in a direction intersecting the direction from the power terminal block 24 toward the inlet 12. There are also two third protrusions 50c, which are arranged in parallel in a direction intersecting the direction from the power terminal block 24 toward the inlet 12. The cable 10 runs from the power terminal block 24, passes between the two first protrusions 50a, is routed along the side of the second protrusion 50b, and is further routed between the two third protrusions 50c. The cable 10 is held down by the first protrusions 50a, the second protrusions 50b, and the third protrusions 50c, and is configured not to easily come off in a direction perpendicular to the surface 31 of the frame 30.

The first protrusion 50a and the second protrusion 50b are not arranged parallel to the direction in which the cable 10 extends. In other words, the cable 10 is bent after passing between the two first protrusions 50a and wired along the side of the second protrusion 50b. After being wired along the side of the second protrusion 50b, the cable 10 is passed between the two third protrusions 50c. The second protrusion 50b is disposed on an imaginary line connecting the center between the two first protrusions 50a and the center between the two third protrusions 50c. Therefore, since the cable 10 is bent at the fixing portion 11 and held down by the multiple protrusions 50, even if the cable 10 is pulled from the power terminal block 24 in the direction of the inlet 12, a load is prevented from being applied directly to the connection between the power terminal block 24 and the cable 10.

6 and 7 are side views of the fixing part 11 shown in FIG. 5. FIG. 6 is a view from a direction perpendicular to the direction in which the cable 10 extends, and FIG. 7 is a view from the direction in which the cable 10 extends. The fixing part 11 is circular when viewed perpendicular to the surface 31 of the frame 30, but has an inclined surface 51 whose outer diameter increases from the surface 31 to the tip 55 when viewed from the side. The inclined surface 51 is formed up to a maximum outer diameter part 56 located halfway in the height direction from the surface 31 of the frame 30 to the tip 55. From the maximum outer diameter part 56 to the tip 55 of the multiple protrusions 50, an inclined surface 57 whose outer diameter decreases as it approaches the tip 55 is formed. Here, the inclined surface 51 on the surface 31 side of the frame 30 may be referred to as the first inclined surface 51, and the inclined surface 57 on the tip 55 side may be referred to as the second inclined surface 57. In addition, the multiple protrusions 50 are fixed to the frame 30, for example, by screwing a screw part 53 into the frame 30.

7, the first inclined surface 51 is inclined with respect to the direction perpendicular to the surface 31 of the frame 30, so that the cable 10 can be held down toward the surface 31. Specifically, the inclination angle of the first inclined surface 51 is preferably set to be 5° or more and 30° or less with respect to the direction perpendicular to the surface 31 of the frame 30. In addition, the spacing dimension w of the maximum outer diameter parts 56 of the two first protrusions 50a is formed to be smaller than the diameter dimension D of the cable 10. Therefore, the inclined surface 51 and the maximum outer diameter part 56 hold the cable 10 toward the surface 31 and prevent it from moving away from the surface 31. In addition, in the first embodiment, the height dimension H of the maximum outer diameter part 56 from the surface 31 of the frame 30 is half the diameter dimension D of the cable 10, that is, equal to or greater than the radius dimension of the cable 10. These relationships are also configured for the two third protrusions 50c.

The second inclined surface 57 is formed so that the outer diameter narrows from the maximum outer diameter portion 56 toward the tip portion 55. This configuration makes it easy to fit the cable 10 between the multiple protrusions 50. The spacing dimension w1 between the tips 55 of the first protrusion 50a and the third protrusion 50c is larger than the diameter dimension D of the cable 10, making it easy to fit the cable 10 between them.

A knurled shape 54 is formed on the surface of the inclined surface 51 of the multiple protrusions 50. The knurled shape 54 is formed with projections and recesses. Therefore, the projections bite into the surface of the cable 10, making it difficult for the cable 10 to come off from the fixed part 11. In the first embodiment, the knurled shape 54 is formed by forming grooves along the generatrix of the inclined surface 51, but the grooves may intersect with each other and may be curved rather than linear.

The cable 10 is formed by bundling multiple wires covered with a tube made of resin or the like. The minimum radius at which the cable 10 can be bent is determined by the specifications of the cable 10, but it is preferable that the spacing between the multiple protrusions 50 of the fixing part 11, particularly the spacing between the first protrusion 50a and the second protrusion 50b, be set to at least equal to or greater than the minimum bending radius of the cable 10. It is also preferable that the spacing between the second protrusion 50b and the third protrusion 50c be set in a similar manner. This allows the cable 10 to be securely fixed by the multiple protrusions 50 without the internal conductors being broken.

As a result of being configured as described above, the lighting fixture 100 according to the first embodiment makes it easy for workers to perform wiring work. In addition, the wiring work can be performed easily by simply pushing the cable 10 between the multiple protrusions 50, and since the fitted state of the cable 10 is easy to see, it is also easy to check whether the work has been done properly, and product reliability is improved. In addition, the multiple protrusions 50 allow the cable 10 to receive loads in the direction in which the cable 10 extends and in the direction in which the cable 10 moves away from the surface 31 of the frame 30. Therefore, even if a load is applied to the cable 10 from outside the housing 60, the load is not applied to the connection between the power terminal block 24 and the cable 10, and damage such as breakage can be suppressed.

Although the embodiment has been described above, the configuration of the lighting device 100 is not limited to the form shown in the drawings, and can be modified as appropriate. For example, the lighting device 100 can have a variable number of multiple protrusions 50 as appropriate. In short, modifications that can be made by a person skilled in the art can be made without departing from the spirit of this disclosure.

10 cable, 11 fixing part, 12 inlet, 20 light emitting part cover, 21 light emitting part, 22 power supply unit, 23 light emitting part, 24 power supply terminal block, 30 frame, 31 surface, 40 mounting fixture, 50 protrusion, 50a first protrusion, 50b second protrusion, 50c third protrusion, 51 (first) inclined surface, 53 threaded part, 54 knurled shape, 55 tip, 56 maximum outer diameter part, 57 (second) inclined surface, 60 housing, 100 lighting fixture, D diameter dimension, H height dimension, w spacing dimension, w1 spacing dimension.

Claims (6)

A housing and
A power terminal block disposed inside the housing;
a cable that is pulled from the outside of the housing to the inside and connected to the power supply terminal block;
a plurality of protrusions for fixing the cable to a frame that is a part of the housing between an inlet into which the cable is drawn and the power terminal block,
The plurality of protrusions include
Two first protrusions protruding from the frame and disposed closest to the power terminal block;
a second protrusion disposed on a side where the inlet is located relative to the first protrusion,
The distance between the two first protrusions is
smaller than the outer diameter of the cable,
The cable includes:
disposed between two of the first protrusions and between the first protrusion and the second protrusion ;
Each of the plurality of protrusions includes a tip portion and a maximum outer diameter portion located midway in a height direction from a surface of the frame to the tip portion,
The side surfaces of the plurality of protrusions include a first inclined surface formed so that the outer diameter increases from the surface toward the maximum outer diameter portion, and a second inclined surface formed so that the outer diameter decreases from the maximum outer diameter portion toward the tip portion,
The cable is clamped between the first inclined surface and the frame . The distance between the first protrusion and the second protrusion is
The luminaire of claim 1 , wherein the minimum bend radius of the cable is greater than the minimum bend radius of the cable. The plurality of protrusions include
two third protrusions arranged on a side where the inlet is located relative to the second protrusions,
The cable includes:
The lighting device according to claim 1 or 2, wherein the third protrusion is disposed between two of the third protrusions. The first inclined surface is
The lighting fixture according to any one of claims 1 to 3 , further comprising a knurled shape. The inclination angle of the first inclined surface is
The lighting fixture according to any one of claims 1 to 4, wherein the lighting fixture is formed at an angle of 5° to 30° with respect to the vertical direction. The cable includes:
The lighting fixture according to any one of claims 1 to 5 , wherein the lighting fixture is formed by bundling a plurality of wires with a tube.

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