JP3015005B2 - Lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device suitable for a learning desk.

[0002]

2. Description of the Related Art Generally, a learning desk has a structure in which a shelf is provided at the rear of a top plate and a lighting device is mounted inside the shelf.
As a lighting device for this study desk, Jitsuho 4-55370 No.
A hollow arm storage chamber extending forward was provided on a column standing on a shelf plate of a shelf or the like, and a hollow arm was fitted into the arm storage chamber so as to be movable back and forth, and a fluorescent lamp was mounted on this arm. It describes that a lamp (illumination head) is attached to be movable back and forth. According to this configuration, the illumination position can be changed in the front-rear direction, so that the range of selection of the illumination mode can be expanded to some extent.

[0003]

By the way, in the case of the lighting device provided inside the shelf of the learning desk, the lighting head is arranged on the lower surface of the shelf plate in most cases, so that the height of the lighting head is constant. Therefore, as described in the above-mentioned publication, only the degree to which the illumination head is mounted so as to be movable back and forth has been considered.

On the other hand, in recent years, children have often used personal computers. However, desktop personal computers have a high height. There is a problem that it is not possible to cope with such a tall article placed on a desk. Also,
In some cases, shelves may be removed to install a personal computer or simply as a matter of preference.In such a case, if a lighting device is mounted on a shelf as in the past, a new There was a problem that lighting equipment had to be purchased.

The present invention has been made in view of such circumstances, and has as its object to provide an illuminating device capable of selecting an appropriate illumination form as needed.

[0006]

Lighting device according to the present invention SUMMARY OF THE INVENTION comprises a fixed post fixed to the top plate of a desk, and a lifting column which had a height adjustably attached to the fixed post, right and left the lamp had attached A longitudinally extending illumination head, and a support arm extending horizontally is integrally provided at an upper end portion of the elevating column so as not to be vertically rotatable with respect to the elevating column. Is mounted so as to be movable in the longitudinal direction of the support arm and rotatable around the axis of the support arm, and the illumination head is attached to the movable arm so as to be swingable in the vertical direction. .

[0007] In the case of a lighting device placed inside a shelf provided on a desk, the largest one of articles expected to be placed on the desk (for example, a desktop personal computer)
It is preferable that the height of the illumination head and the drawing stroke are set in accordance with the distance so that illumination can be performed up to the front of the largest article.

[0008]

According to the present invention, not only the front-back position and height of the illumination head can be changed, but also the posture of the illumination head can be changed by rotating the movable arm around the axis of the support arm, or the illumination can be changed. Since the head can be swung up and down with respect to the movable arm to change the lighting direction, an appropriate lighting style should be selected according to the usage of the articles placed on the desk and the size of the user's body. It can be realized or closer to a suitable lighting configuration. Moreover, since capable of swinging the lighting head in the vertical direction, replacing the run-<br/> flop is easy.

Further, since the lighting device can be mounted on a tabletop of a desk, when the lighting device is arranged inside a shelf of a learning desk, for example, a large-sized article such as a desktop personal computer is placed on the desk. Even when the lighting device is removed, the lighting device can be used as it is, and the height, front and rear position, and posture of the lighting head can be changed. Therefore, even when a large product is placed on a desk, the lighting device can be used in front of the lighting device. Can be illuminated, and as a result, an appropriate illumination form can be provided to the user.

When a human hand or object hits the left and right ends of the illumination head from the front, a moment acts to horizontally rotate the support arm. There is a possibility that an external force concentrates on a portion where the strength of the device is weak and the lighting device or the tabletop is damaged or deformed. On the other hand, according to the configuration of the second aspect, the moment is absorbed by the lighting head turning horizontally around the axis of the lifting / lowering column, so that the lighting device or the tabletop is damaged or deformed. Can be prevented or significantly suppressed. Further, with the configuration as in claim 2, there is an advantage that the illumination position can be set more accurately.

In addition, it is necessary to pass a power supply cord through the lighting head. In this regard, Japanese Utility Model Publication No. 4-55370 discloses that the cord passes through the arm and the arm storage chamber. Since the arm must be attached to the arm storage chamber in a state where it is inserted into the arm storage chamber, there is a disadvantage that the assembling work is troublesome. On the other hand, according to the third aspect of the present invention , the cord can be covered in a state where the movable arm is attached to the supporting arm and then the cover is barely exposed, so that the assembling work is simplified. There is.

Further, when the cord is deformed in the cover by the back and forth movement of the illumination head, the cord is deformed so as to entirely expand or contract while surrounding the projection of the movable arm. Therefore, it is possible to prevent the deformation from being concentrated on only a part of the cord when the illumination head is moved back and forth, and as a result, there is an advantage that the durability of the cord can be significantly improved.

[0013]

Next, embodiments of the present invention will be described with reference to the drawings. << 1st Embodiment >> {. Outline of Desk≫ FIGS. 1 to 10 show a first embodiment, of which FIG.
1 (A) shows the appearance of the desk (learning desk) 1. A shelf 4 is detachably attached to a rear portion of the top plate 2 of the desk 1 by a metal fitting 3 or the like. The shelf 4 includes left and right side plates 5, one shelf plate 6, and upper and lower back plates.
7, 8 in the space below the shelf 6
Has been arranged.

The shelf plate 6 may be fixedly attached to the side plate 5, or may be attached with a pin or the like so as to be adjustable in height.
Further, a plurality of shelves may be arranged in multiple stages. FIG. 1B is a skeleton diagram of the lighting device 9, and as shown in FIG. 1 and FIG. 1A, the lighting device 9 includes a fixed support 10 fixed to the top plate 2 and a fixed support 10. An elevating column 11 is fitted into a fixed column 10 so as to be adjustable in height, and an illumination head 13 having a long tubular fluorescent lamp 12 as an example of a lamp. A support arm 14 extending forward is integrally provided at the upper end of the elevating column 11, and a movable arm 15 is attached to the support arm 14 so as to be movable forward and backward and rotatable about an axis. The head 13 is mounted so as to swing up and down.

The illumination head 13 can be moved up and down by a certain size even when the shelf 4 is mounted.
Is set so that it can be lifted above the height of the shelf 6 by removing it. Further, the lighting head 13 can be pulled out in front of the shelf 6, and
Can be slightly swung up and down and left and right as indicated by the arrows in FIG. 1 (B) even when pushed down below the shelf 6, and when pulled out forward of the shelf 6 Can be swung more.

Hereinafter, the structure of each part will be described in detail. ≪. Mounting Structure of Fixed Post 1 The structure of the fixed post 10 is mainly shown in FIGS. 2 (A) is a front view, FIG. 2 (B) is a plan view as viewed from BB of FIG. 2 (A), FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIG.
Is a cross-sectional view taken along line IV-IV of FIG. 2 (A), (B) is a cross-sectional view taken along BB of (A), (C) is a cross-sectional view taken along CC of (A), and FIG. 5 is a state where a back cover is removed. FIG.

For example, as shown in FIG. 3, the fixed support column 10 is arranged on the back side of the lower back plate 8, and is fixed to the rear end edge of the top plate 2 by a screw type clamp body 16 provided at the lower end thereof. I have.
At the lower end of the fixed support 10, a base portion 10 a protruding forward is integrally provided, and this base portion 10 a is attached to the lower back plate 8.
And is exposed forward from a notch hole 17 formed in the hole. The base unit 10a is provided with a switch 18 (see FIG. 2A). Note that the switch may be provided on the illumination head 13. Base part
The cord C is drawn inward from the side of 10a.

As clearly shown in FIG. 2 (A) and FIG.
Is approximately the same height as the fixed support 10, and the lower back plate 8 and the shelf 6
A gap larger than the vertical width of the lighting head 13 is left between the two. Therefore, by releasing the fixing by the metal fitting 3 and pulling out the shelf 4 toward the user, only the shelf 4 can be removed in a state where the lighting device 9 remains as it is. Fig. 4 (B)
As shown in FIG. 1C, the fixed support column 10 is formed in a substantially C-shaped cross section opened rearward, and a back cover 20 is fixed to the rear surface thereof.

≪. Mounting structure of lifting column ≫ The lifting column 11 has a structure in which a hollow guide tube 22 is mounted on a core body 21, and the guide tube 22 of the lifting column 11 is provided with a cap 23 mounted on the upper end of the fixed column 10. The fixed support 10 is slidably fitted to a fixed guide body 24 provided at an intermediate height position. As shown in FIG.4 (A), a locking member 25 having a saw-toothed unevenness formed in a vertically long side view when fixed to the front inner surface of the fixed support column 10 by a suitable means such as screwing, and a guide cylinder. An engaging member 26 made of a leaf spring, which is fitted and removed against the unevenness of the serrated locking member 25 against elasticity, is attached to the front surface of the lower end of the lower member 22 by a suitable means such as screwing. Therefore, the lifting column 11
Is raised and lowered against the elasticity of the engaging member 26,
The height of the lifting column 11 can be freely changed. Although not shown, a stopper for restricting the lower limit of the lowering of the guide body 24 is provided inside the fixed support 10.

As shown in FIGS. 4 (B), 4 (C) and 5, a vertical groove 27 through which the cord C can be inserted is formed on the back surface of the guide cylinder 22 over the entire length in the vertical direction. It is pulled upward from the groove provided. In addition, lifting column 11
In order to prevent the cord C from coming out of the vertical groove 27 at the time of ascending and descending, as shown in FIG.
A clip 28 is provided to hold the cord C so that the cord C cannot be pulled down.

In the present embodiment, the guide cylinder 22 is manufactured to have the same cross-sectional shape by extrusion molding of synthetic resin, aluminum, or the like, but a metal or synthetic resin pipe may be used. In addition, although the fixed support 10 is made of a synthetic resin or a metal plate, a metal or synthetic resin pipe may be used. As shown in FIG. 4 (A), between the upper end back surface of the core body 21 and the inner surface of the guide tube 22 in the elevating column 11, a holding member formed of a synthetic resin (which may be made of a leaf spring) into a side-view wave type. The member 29 is interposed. As a result, the lifting column 11
Backlash can be prevented. The core 21 of the elevating column 11 is fitted to the guide tube 22 so as to be horizontally rotatable. Therefore, the lighting head 13 can be largely horizontally pivoted around the axis of the core 21 in the elevating column 11 (the shelf 4 is When removed, it can be turned horizontally horizontally). For this reason, the lighting position can be set more appropriately, and a moment when a human hand or an object hits the left and right end portions of the lighting head 13 or the like from the front is absorbed, and the lighting device 9 or the desk top plate 2 is damaged. -Deformation can be prevented.

In this case, since the core 21 of the lifting column 11 is polygonal in cross section (octagonal in the figure: see FIG. 4B), the holding member
If the fixing member 29 is fixed to the guide cylinder 22, the pressing member 29 intermittently hits the flat surface of the core 21 in the elevating column 11 with the horizontal rotation of the lighting head 13; There is an advantage that it can be held in a posture that is horizontally turned stepwise around the axis of the lifting column 11.

The core 21 of the elevating column 11 is made of synthetic resin, and a metal reinforcing rod 30 is embedded therein by insert molding. ≪. Movable Arm≫ The mounting structure of the movable arm 15 mainly appears in FIGS. 6A is a sectional view taken along line VI-VI of FIG. 2B, FIG. 6B is a sectional view taken along BB of FIG. 6A, and FIG. 6C is a sectional view of FIG.
FIG. 7 is a partially cutaway plan view, and FIG. 8 is a partially omitted bottom view.

For example, as shown in FIG.
A support arm 14 having a circular cross section extending horizontally forward is formed integrally with the upper end of the core body 21 (the reinforcing rod 30 is also bent into an L-shape), and the movable arm 15 is slid from the outside to the support arm 14 Fits freely. The support arm 14 has a structure in which the upper member 31 and the lower member 32 are overlapped and fixed with screws 33,
It is formed in a square box shape as a whole. Movable arm 15
Among them, the upper member 31 is formed in a plate shape, and the lower member 32 is formed in a substantially U-shape with an upward opening. Also, upper and lower members 3
Back plates 31a and 32a which are fitted to the support arm 14 from above and below are provided integrally with the rear ends of the support arms 1 and 32, respectively.

At the front of the support arm 14, a front guide body 34 which fits inside the movable arm 15 is mounted. Front guide body
Numeral 34 denotes a structure in which two members 35 and 36 which are divided into upper and lower portions are integrally fastened with screws 37, and have a square shape as a whole. Further, the front guide body 34 is held by a front / rear stopper 38 provided on the support arm 14 so that the front guide body 34 cannot be pulled back and forth.
The front guide body 34 is for stably moving the movable arm 15 back and forth, and as is apparent from FIG.
The movable arm 15 and the movable arm 15 can rotate integrally around the axis of the support arm 14, and the movable arm 15 can move back and forth while being supported by the front guide body 34.

The upper and lower two members 3 constituting the front guide body 34
5 and 36, the movable arm 15 can be held in a posture rotated around the axis of the support arm 14 by elastically sandwiching the support arm 14 between the support arms 14, and therefore, FIG. 6 (B)
As shown in the figure, there is a gap between one end of the upper and lower members 35 and 36.
39 is empty. ≪. Wiring structure and cover≫ A cylindrical projection 40 is provided on the lower surface of the lower member 32 of the movable arm 15 at a position near the rear end, and a portion of the lower surface of the lower member 32 that is closer to the projection 40 than FIG. As shown in FIG. 8B and FIG. 8, a cord insertion groove 41 extending in the front-rear direction is formed, and the cord C wound around the projection 40 is fitted into the code insertion groove 41. As shown in FIG. 8, claws 42 for preventing the cord C from coming off are alternately formed in the cord insertion groove 41.

The movable arm 15 is covered with a pair of covers 53 and 44 which are vertically overlapped, and the upper and lower covers 43 and 44 are fastened with screws 45 as shown in FIG. As shown in FIG. 6 (A), the rear ends of the upper and lower covers 43, 44 are fitted in an annular groove 46 provided at the base of the support arm 14. Therefore, the upper and lower covers 43 and 44 do not move back and forth, and only the movable arm 15 can move back and forth.

A cord storage portion 44a is provided on the lower surface of the lower cover 44.
The cord C is stored in the cord storage portion 44a in a loosened state, so that the movable arm 15
Makes it possible to move back and forth. Lower member of movable arm 15
The projection 40 provided on the bottom 32 is in contact with or close to the inner bottom surface of the lower cover 44. As shown in FIG. 7, a notch groove 47 for drawing out the cord C is formed at the rear edge of the lower cover 44. As shown in FIG. 7, a rod 48 for winding and fixing the cord C is integrally formed in the lower member 32 of the movable arm 15 in the vicinity of the notch groove 47.

As shown in FIGS. 6A and 6C and FIGS. 7 and 8, a rear rib 49 is formed at the rear end of the lower member 32 of the movable arm 15, and the cord insertion groove is sandwiched between the projections 40. 41
Side ribs 50 are formed on the side opposite to the side, and both ribs 49, 50 are in contact with or closely contact the inner bottom surface of the cord storage portion 44a of the lower cover 44. Thus, the code C
7, the cord C housed in the lower cover 44 when the movable arm 15 is moved back and forth has a large curvature as a whole, so that it can be easily understood from FIG. Will do. Further, the presence of the rear ribs 49 and the side ribs 50 prevents the cord C from being caught in the gap between the lower cover 44 and the movable arm 15.

III. Next, the mounting structure of the lighting head 13 will be described with reference to FIG.
This will be described with reference to FIGS. 9 and 10 in addition to 6 (A) and FIGS. FIG.
10 is a partial perspective view in a state where the movable arm 15 is turned upside down, FIG. 10 (A) is a sectional view taken along the line XX of FIG. 2 (B) and FIG. 7, and FIG. 10 (B) is a sectional view (A). FIG.

For example, as shown in FIG.
Is provided with a shade 52 opening downward, left and right side frames 53 and the lamp 12. A reflector 54 is mounted inside the seed 52. Further, at the left and right central portions of the shade 52, there is provided a handle 55 for putting a finger when pulling the illumination head 13 toward the user. Although the tab 44 is fixedly provided in the embodiment, it may be a flip-up pivot type.

As shown in FIG. 6A and FIG.
At the front ends of the upper and lower members 31 and 32, a pair of left and right semicircular boss portions 56 that become cylindrical when overlapped with each other are provided, while the shade 52 is movable on the shade 52 as shown in FIG. A rearward projecting portion 52a extending toward the arm 15 is formed, and a pair of left and right bearing portions that are fitted to the boss portion 56 of the upper member 31 of the movable arm 15 from above from the rearward projecting portion 52a.
57 are formed.

As shown in FIG. 7 and FIG.
A pressing cover 58 is superimposed on the rearward projecting portion 52a of the movable arm 15 from below, and a bearing portion 59 is formed on the pressing cover 58 so as to be fitted to the boss portion 56 of the lower member 32 of the movable arm 15. The holding cover 58 is fastened to the rearward projecting portion 52a of the shade 52 by, for example, a screw 60 shown in FIG. 7 (may be attached by other means). Therefore, the illumination head 13 can rotate around the axis of the boss 56 in the movable arm 15. In other words, the lighting head 13 can be swung up and down. Each boss 56 has a flange 56a. Although not shown, the boss portions 56 of the upper and lower members 31, 32 of the movable arm 15 are integrally fastened with screws.

As shown in FIG. 2B, the rearward protruding portion 52a of the shade 52 and the pressing cover 58 are formed so as to be deviated to one side from the center line of the movable arm 15, and a ballast or the like is provided in the hollow portion. Members such as an inverter are arranged. Figure 2 (B) and figure
As shown in FIGS. 7 and 8, the rearward projecting portion 52a of the shade 52 and the pressing cover 58 are formed in a hollow shape so as to open rearward in plan view to prevent interference with the movable arm 15. In addition, as shown in FIG.
The cord insertion groove 41 extends to one boss 56. Therefore, the cord C can be inserted into the space between the bosses 56 with the upper and lower members 31 and 32 of the movable arm 15 superposed.

The left and right boss portions 56 of the movable arm 15 are set so that one is longer and the other is shorter, and as shown in FIGS. The holding plate 61 formed in the shape of
One end of 61 is fixed to the rearward protruding portion 52a of the shade 52 with the screw 62, while the other end of the holding plate 61 is inserted with the screw 64 protruding from the shooting 63, and this screw 64 is Nut non-rotatably fitted in recess 65 of protrusion 52a
Screwed into 66. Therefore, when the shooting 63 is loosened, the lighting head 13 can be swung up and down freely, and when the shooting 63 is screwed in a desired posture, the lighting head 13 is locked in that posture.

As shown in FIG. 2A, a pilot lamp 67 for indicating brightness is provided on the front surface of the shade 52. ≪. Conclusion In the above configuration, the height of the illumination head 13 can be adjusted within a certain range even when the lighting device 9 is arranged inside the shelf 4 as well as when the shelf 4 is removed. Further, the illumination head 13 can be pulled out in front of the shelf 6. Also, regardless of the presence or absence of the shelf 4, the lighting head 13 can be swung up and down around the boss portion 56 of the movable arm 15 and swung in the left and right direction around the axis of the support arm 14. Therefore, an appropriate illumination mode can be selected according to the usage mode of the article on the desk, the size of the user's body, and the like.

By removing the shelf 4, large articles such as a desktop personal computer can be placed,
Or you can use a wide desk, but in that case can be used as a lighting device 9 also. As in the embodiment,
If the illumination head 13 is configured to be able to be raised to a height higher than the shelf plate 6, even when the shelf 4 is removed and a tall article such as a personal computer is placed on a desk, the front of the article is illuminated. It is particularly beneficial because it can

Further, since the illumination head 13 can be turned horizontally largely around the axis of the lifting column 11, the illumination position can be set finely and, when a forward external force acts on the shade 52, the external force is absorbed. Can be. Furthermore, as in the embodiment, when the boss portion 56 of the movable arm 15 is sandwiched between the rearwardly projecting portion 52a of the shade 52 and the pressing cover 58 from above and below, the assembly is simplified.

{(2). Another Embodiment (FIG. 11)} FIG. 11 shows a second embodiment which is a modification of the first embodiment. That is, in this embodiment, the movable arm
This is a modified example of the projection 40 provided on the lower member 32 of FIG. 15, in which the projections 40 are provided in a ring shape in a discrete manner. As can be easily understood from this example, the protrusion 40 may have any form as long as the cord C can be formed in a ring shape.

{(3) Others} Specific examples of the present invention are not limited to the above embodiment, and can be embodied in other various structures.
For example, the lifting column may be supported by other height adjusting means such as a screw mechanism. In the first embodiment, the movable arm is fitted on the support arm. However, the movable arm may be fitted inside the support arm so as to be movable back and forth.

Also, various structures can be adopted for the structure in which the illumination head is swingably mounted on the movable arm. Further, the illumination head may be configured to rotate horizontally with respect to the movable arm. In addition, the present invention can be applied not only to a learning desk but also to a desk for office use or the like.

[Brief description of the drawings]

1A is a perspective view of a desk, and FIG. 1B is a skeleton view of a lighting device.

2A is a front view, and FIG. 2B is a plan view of BB in FIG. 2A.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

4 (A) is a sectional view taken along line IV-IV of FIG. 2, and FIGS. 4 (B) and 4 (C) are sectional views taken along line BB and CC of FIG.

FIG. 5 is a rear view of the column with the back cover removed.

6A is a sectional view taken along line VI-VI of FIG. 2B, and FIGS. 6B and 6C are sectional views taken along line BB and CC of FIG.

FIG. 7 is a plan view omitting an upper cover.

FIG. 8 is a bottom view in which a lower cover is omitted.

FIG. 9 is an exploded perspective view of a movable arm.

FIG. 10 is a sectional view taken along line XX of FIGS. 2 (A) and 7;

FIG. 11 is a bottom view of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Studying desk 2 Top board 4 Shelf 6 Shelf board 7,8 Backboard 9 Lighting device 10 Fixed support column 11 Elevating support column 12 Lamp (fluorescent lamp) 13 Lighting head 14 Support arm 15 Movable arm 21 Core body 22 Guide tube 31,32 arm 34 Front guide body 43,44 Cover 40 Protrusion 41 Cord insertion groove 52 Seed 56 Boss 57,59 Bearing 58 Presser cover 63

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FIF21Y 103: 00 (72) Inventor Hidefumi Kubota 29-4 Kume, Iida City, Nagano Prefecture Shinryo Electric Co., Ltd. (56) References Special JP-A-4-277810 (JP, A) JP-A-7-65621 (JP, A) JP-A-9-320334 (JP, A) JP-A-9-320335 (JP, A) JP, U) Japanese Utility Model Showa 54-177701 (JP, U) Japanese Utility Model Application Hei 2-69415 (JP, U) Registered Utility Model 3009117 (JP, U) Japanese Utility Model Hei 1-222172 (JP, Y2) (58) Survey Field (Int.Cl. ⁷ , DB name) F21S 4/00 F21S 6/00 F21V 21/28 F21V 33/00

Claims (4)

(57) [Claims] And 1. A fixed post that is tilted non secured to the top plate of a desk, provided with a lifting column which had a height adjustably attached to the fixed post, and left and right longitudinal lighting head of lamp has had attached At the upper end of the lifting column, a horizontally extending supporting arm is integrally provided in a state in which the supporting column cannot rotate vertically with respect to the lifting column, and the movable arm is moved to the supporting arm in the longitudinal direction of the supporting arm. A lighting device, wherein the lighting head is mounted so as to be freely and rotatable around the axis of a support arm, and the lighting head is mounted on the movable arm so as to be swingable in a vertical direction. 2. The lighting device according to claim 1, wherein the lifting column is horizontally rotatably mounted on a fixed column. 3. The movable arm according to claim 1, wherein the movable arm is movably fitted to a support arm in a state where the movable arm is located outside, and the movable arm is attached to an outer peripheral surface of the movable arm. While attaching a part of a cord for supplying power to the lamp, a cover for covering the movable arm is attached to the support arm, and a cord for allowing deformation of the cord accompanying the forward and backward movement of the movable arm is provided inside the cover. A lighting device with a storage section and a cord pulled out from the back of the cover. 4. A plan view in which a cord storage portion is formed on a lower surface portion of the cover, and a cord wound in the code storage portion of the cover is wound on a rear lower surface of the movable arm. A substantially circular projection is formed, and a cord storage groove in which the cord is fitted so as not to fall off is formed at a portion of the lower surface of the movable arm ahead of the projection so as to extend in the front-rear direction. A lighting device consisting of a cord drawn out of a lighting head into a lighting head