KR101422739B1 - Electric Pole for Moving Position of Electric Power Line - Google Patents

Abstract

An objective of the present invention allows a worker to adjust the position of a cross-arm by both hands to conveniently perform an adjustment operation and reduces a working time by preventing the cross-arm from dropping by a self-weight although a lock bolt fixing the cross-arm is released because the worker can work while the cross arm is tracked by a tracking device upon adjustment of a position of the cross-arm. An objective of the present invention is to provide an electric pole for adjusting a position of a distribution line, which allows a worker to easily work by moving the cross-arm without directly lifting the cross-arm although a position of the cross-arm is changed and capable of preventing deflection due to self-weight by pulling and supporting the cross-arm upward. The electric pole for adjusting the position of a distribution line includes an electric pole having a cylindrical shape tapered so that a diameter is gradually increased downward (gravity direction); the cross-arm elastically pressed to a tapered outer peripheral surface of the electric pole and including an insulator supporting the distribution line; and a locking device and the tracking device fixed to the electric pole to lift the cross-arm.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001]

The present invention relates to a telephone pole for controlling the position of a distribution line, and more particularly, it is possible to conveniently change the position of a distribution line while firmly fixing a distribution line. Also, The present invention relates to a telecommunication pole for position control of a distribution line that can be installed with a pulling mechanism to make the position adjustment operation more convenient, and after the position adjustment, .

Generally, a telephone pole supports electric wires that connect with power stations and substations, and guides electric wires to places where electricity is required, such as a home or a company.

However, since the electric wire runs at a relatively high voltage, it may be short-circuited through the insulated electric pole. Therefore, in order to minimize the possibility, the electric wire should be fixed by insulator excellent in insulation so that the wire and the wire do not come into direct contact with each other. These insulators are called insulators.

FIG. 1 is a view showing a conventional electric wire, FIG. 2 is a view showing the electric wire 120 of the electric wire of FIG. 1, and FIG. 3 is a sectional view of the main part of the electric wire with respect to the line S-S in FIG.

1 to 3, the insulator 123 is fixed to the light guide 120 and the light guide 120 is fixed to the pole 110 via belts 125 and 126. [

The light guide 120 described above is fixed to the pole 110 through the second belt 126 and a cantilever type horizontal support 121 fixed to the pole 110 through the first belt 125, (Gravity direction) deflection of the horizontal support 121. The support base 122 has a support base 122,

The insulator 123 is fixed on the horizontal support 121 of the light guide 120 and the power line 130 is fixed to the insulator 123 so that the insulator 123 is not directly contacted to the power pole 110, It is exactly fixed.

The horizontal support 121 is deformed downward due to the weight of the distribution line 130 fixed to the insulator 123. The support support 122 includes a horizontal support 121 and a second belt 126 And the screws 131 and 133 are combined to solve this problem.

The first belt 125 has one end 1251 and the other end 1252 coupled to the hinge 127 and the other end 1252 can be opened and closed in the horizontal direction from the one end 1251. The second belt 126 can be coupled to the one end 1261 and the other end 1262 with the hinge 128 and the other end 1262 can be opened and closed from the one end 1261. [ Holes 1321 and 1322 are formed at the ends of the one end 1251 of the first belt 125 and the ends of the other end 1252 of the first belt 125. The operator inserts the first belt 125 into the pole 110 The first belt 125 can be fixed to the main body 110 by engaging the rear holes 1321 and 1322 with the screws 132. [ Holes 1331 and 1332 are formed at the ends of the one end 1261 and the other end 1262 of the second belt 126 respectively and the worker moves the second belt 126 to the pole 110, The second belt 125 can be fixed to the pole 110 by engaging the holes 1331 and 1332 with the screws 133. [

3, the main body 110 has a tapered shape having a larger diameter as it goes downward, while the first belt 125 and the second belt 126 have a non-tapered cylindrical shape And has a structure optimized to be closely fixed to the body. Therefore, when these belts 125 and 126 are fixed to the mains 110, there is a gap C between the belts 125 and 126 and the mains 110, 110) and the support base (120).

Also, the conventional method of fixing the distribution line 130 to the mains 110 using the light guide 120 is troublesome in changing the fixing position of the distribution line 130. [ For example, the operator can remove the first belt 125 and the second belt 126 from the pole 110 and then fasten the first belt 125 and the second belt 126 back to desired positions on the pole 110 And the gap between the first belt 125 and the second belt 126 is regulated so that the slope of the horizontal support 121 is adjusted.

In order to solve such a problem, a telephone pole for controlling the position of a distribution line of a domestic patent No. 10-1175315 (hereinafter referred to as "prior art") has been proposed.

According to the prior art described above, the light ends of the light poles, which are resiliently pressed on the tapered outer peripheral surface of the electric pole and are provided with insulators for supporting the distribution line, and the holes formed at both ends are screwed together, The power distribution line can be firmly fixed with the belt provided with the elastic repulsive force for the light armature to easily change the position of the power distribution line and can be firmly fixed to the electric pole by its own structure of the light arm.

However, in the above-described prior art, when the screw of the belt fixing the light guide is loosened to adjust the position of the distribution line, the light guide falls down due to its own weight, so the operator must hold the light guide in one hand, To unscrew the belt. Therefore, the worker needs to unlock and tighten the screw of the belt with one hand. Therefore, there is a disadvantage in that the position adjustment of the brace is very troublesome and takes a lot of time, and even when the position of the brace is changed, It is very difficult to work with the power in a state where the pole position is high and the posture is unstable.

Korean Registered Patent No. 0840356 (Registered on June 16, 2008) Name of invention: Telephone pole for controlling the position of distribution line. Korean Registered Patent No. 1191755 (Registered Oct. 10, 2012) Title of invention: Telephone pole for position control of distribution line. Korean Registered Patent No. 1175315 (registered on August 13, 2012) Name of invention: Telephone pole for controlling the position of distribution line.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to solve the above- The operator can perform the position adjustment work of the light arm using both hands by making the light weight of the light arm not fall by the self weight so that the position adjustment work is very convenient and the work time can be shortened and when the position of the light arm is changed The worker can work without any difficulty by moving the worker using the pulling mechanism without lifting the light guide directly, and it is possible to prevent the deflection phenomenon due to the self weight by supporting the pulling of the light guide upward after the position adjustment work And a telephone pole for controlling the position of the distribution line.

According to an aspect of the present invention, there is provided a portable telephone comprising: a main body having a tapered cylindrical shape such that its diameter becomes larger toward the bottom; Having a tapered outer peripheral surface of the electric pole and having an insulator for supporting the distribution line; And a traction device fixedly installed on the electric pole to lift the light arm.

In addition, the lightweight metal may include: a first metallic body formed to surround half of an outer circumference of a telephone main body; A second metallic body coupled to the first body by a hinge so as to be openable and closable in a horizontal direction and to surround the other half of the telephone main body; A metallic horizontal support extending from an upper portion of the second body and having an insulator secured thereto; And a metallic support base extending from a lower portion of the second body to a lower portion of the horizontal support to prevent deflection of the horizontal support, wherein the first body and the second body are tapered in the vertical direction, Upper and lower ends formed to be inclined so as to press the electric pole; A middle portion connecting the upper and lower ends thereof and having an inner space not in contact with the electric pole; A flange protruding outwardly from the opening and closing portions of the first and second bodies; An elastic piece mounted on an inner circumferential surface of the center portion and contacting the outer circumferential surface of the electric pole; And a fastening bolt for fastening the flanges of the first and second bodies to each other. When the center portion is pressed inward due to the fastening of the fastening bolts, the central portion and the upper and lower ends are elastically bent and deformed to join the pole .

The pulling device may further include: a fixing member positioned at an upper portion of the lightening member and fixed to the mainsheet; A protective box fixed to the fixing member and having a door; A driven gear and a traction roller fixed to a first horizontal shaft rotatably installed on the inner wall of the protective box and rotated together with a first horizontal shaft; A wire wound around the pulling roller and having a hook at an end thereof; A pulling ring formed on the light guide wire for hooking the hook of the wire; A driving gear fixed to a second horizontal shaft rotatably installed on an inner wall of the protective box and rotated together with a second horizontal shaft and engaged with the driven gear; A circular handle fixed to the second horizontal shaft for rotating the driving gear; And a lock mechanism installed between the inner wall of the protective box and the second horizontal shaft to selectively fix the second horizontal shaft so as not to rotate, wherein the lock mechanism is fixed to the second horizontal shaft and rotates together with the driving gear A rotary plate having a plurality of engagement grooves formed along an outer circumference thereof; A locking position in which the locking pin is provided on the inner wall of the protective box so as to be rotatable about the center pin and one end thereof is engaged with the locking groove of the rotation plate and the other end is provided with a knob, A lock lever which rotates between an unlocking position where the latching pin is spaced from the latching groove; First and second tension coil springs having one ends fixed to the lock lever and disposed on both sides of the lock lever; First and second elastic regulating fins fixed to the other ends of the first and second tension coil springs; First and second locking holes formed on an inner wall of the protective box to insert the first elasticity adjusting pins; And first and second unlocking holes formed in an inner wall of the protective box and into which the second elasticity adjusting pins are inserted, wherein the first locking hole and the second locking hole 1 The position of the unlocking hole is made far from the lock lever.

According to the present invention having the above-described characteristic features, when adjusting the position of the light arm fixed to the electric pole, when the light bolt fastening the light arm is released by pulling the light arm with the pulling mechanism, So that the operator can perform the position adjustment and fixing operation of the light arm using both hands without changing the light arm and can change the position of the light arm by manipulating the pull mechanism, It is very convenient and quick to adjust the position of the light arm without any difficulty.

Further, according to the present invention, even after changing the position of the light arm, the light arm can be pulled upward by using the pulling mechanism, so that the light arm is more firmly fixed and the sagging phenomenon due to its own weight is prevented to the utmost have.

1 is a perspective view of a main portion of a conventional telephone pole.
Fig. 2 is a perspective view showing a conventional light arm brace for a telephone pole; Fig.
Fig. 3 is a longitudinal sectional view of the SS line of Fig. 1; Fig.
4 is a perspective view of a main part of a telephone pole for position control of a distribution line according to the present invention.
FIG. 5 is a perspective view showing a light guide metal in FIG. 4; FIG.
Fig. 6 is a longitudinal sectional view of the SS line of Fig. 4; Fig.
Fig. 7 is a perspective view showing the traction device in Fig. 4; Fig.
Fig. 8 is a longitudinal sectional view showing the use state of the traction device shown in Fig. 4; Fig.
9A and 9B are front views showing the locking mechanism of the traction device in Fig.
10 is a plan view showing the locking mechanism of the towing device in Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to the description of the present invention, the following specific structure or functional description is merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms , And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The present invention uses prior art No. 10-1175315. Therefore, the basic structure of the electric pole for controlling the position of the distribution line described below is all described in the registered patent No. 10-1175315.

However, the present invention further includes the structure of the pulling device 300 for lifting the light guide 220 installed in the telephone pole 210 among the structures disclosed in the Japanese Patent No. 10-1175315, Thereby achieving a constitutional characteristic.

Therefore, the device structure, characteristics, and operation relationship described below are mostly cited in the description of the similar structure among the contents of the above-mentioned Japanese Patent No. 10-1175315, and the detailed description related to the main features of the present invention .

As shown in FIGS. 4 and 6, the electric wire 210 for controlling the position of the distribution line of the present invention has a tapered cylindrical shape whose diameter decreases toward the upward direction. According to the present invention, the tapered outer circumferential surface 211 of the telescope 210 is provided with a light-weighted joint 220 to be fixed by being elastically compressed.

The light guide 220 has a plurality of insulators 225 for fixing the distribution line 250. The insulator 225 refers to a connection member having excellent insulation so that the electric pole 210 and the distribution line 250 are not in direct contact with each other. For example, it is preferable to use a self-polymer material as the insulator 225.

In addition, the light guide plate 220 is installed so as to surround the phone main body 210, and then generates an elastic repulsive force of the light guide plate 220 relative to the phone main body 210. That is, the light guide 220 according to the present invention is formed to have an elastic support structure.

5 and 6, the light guide 220 includes a first body 221, a first body 221, and a hinge 226. The second body 221 is coupled to the first body 221 by a hinge 226, And a body 222. The light guide 220 may extend from the top of the second body 222 in a cantilever fashion and may include a horizontal support 223 to which a plurality of insulators 225 supporting the distribution line 250 are fixed. Respectively. Further, the light guide 220 includes a support support 224 extending from the bottom of the second body 222 to the lower portion of the horizontal support 223 to prevent deflection of the horizontal support 223.

The first body 221 and the second body 222 of the light guide 220 have upper and lower ends 227 that are tapered in the up and down direction and enter inwardly and a central portion 227 that connects the upper and lower ends 227, (228) so as to form an integral curved bridge shape.

A flange 229 is formed at the opening and closing portions of the first body 221 and the second body 222 of the light guide 220 and an elastic piece 230 is disposed at the central portion 228 of the inner body 220, The two flanges 229 can be fastened to each other by fastening bolts 231.

The first body 221 and the second body 222 constituting the light guide 220 are formed in a structure capable of elastic deformation. Therefore, various known metal bodies may be formed to have such an elastic bending structure. As such a metal body, various materials such as steel and aluminum can be used.

When the central portion 228 of the first and second bodies 221 and 222 is pressed inward due to the tightening of the fastening bolts 231, the elastic piece 230 and the upper and lower ends 227 are deformed flexibly, The body 221 and the upper and lower ends 227 of the second body 222 press the electric pole 210. The resilient repulsion structure of the light guide 220 prevents the light guide 220 from moving up and down and rotating in the main pole 210, and can be further increased as the tightening bolt 231 is further tightened.

Although not shown, a friction material capable of increasing frictional force with the outer peripheral surface 211 of the electric pole 210 can be further provided on the inner surfaces of the upper and lower ends 227 of the light-

Since the upper and lower ends 227 of the light guide bars 220 press the outer peripheral surface 211 of the electric pole 210, the electric wire 250 can be firmly fixed. In addition, since the lightweight metal 220 is integrated with the conventional one, it is easy to handle in the work.

For example, the operator can unfasten the tightening bolt 231 to rotate the light guide 220 along the outer peripheral surface 211 of the electric pole 210, And the lightening bolt 220 can be firmly fixed by tightening the fastening bolt 231 at a desired position of the telephone pole 210. [

As shown in FIGS. 4, 7, and 8, the present invention includes a pulling device 220 that pulls the light guide 220 to adjust the position of the light guide 220, (300).

The pulling device 300 includes a fixing member 310 positioned at the upper portion of the light guide 220 and fixed to the main body 210 and a protection member 310 fixed to the fixing member 310 and having a door 321 And a box 320.

The fixing member 310 is formed in a cylindrical shape so that one side is connected to the hinge 311 and the other side is open. The open end of the fixing member 310 is opened to be inserted into the electric wire 210 and then fixed with bolts and nuts have.

A first horizontal axis 331 and a second horizontal axis 351 are disposed on the inner wall of the protection box 320 so as to be rotatable.

A driven gear 332 and a traction roller 333 are sequentially fixed to the first horizontal axis 331 so as to rotate together with the first horizontal axis 331. A wire 340 is wound around the traction roller 333, A hook 341 is provided at an end of the wire 340 and a pulling ring 342 for hooking a hook 341 of the wire 340 is formed in the light fitting 220.

A driving gear 352 engaged with the driven gear 332 and a circular handle 353 for rotating the driving gear 352 are fixed to the second horizontal shaft 351 so as to rotate together with the second horizontal shaft 351 .

Therefore, by rotating the circular handle 353, rotational power is transmitted to the driving gear 352, the driven gear 332, and the pulling roller 333 so that the wire 340 can be unwound or wound. At this time, it is preferable that the circular handle 353 is formed to have a larger diameter than the driven gear 332 and the driven gear 352 to minimize the force required to rotate the circular handle 353.

The traction device 300 of the present invention includes a locking mechanism 400 installed between the inner wall of the protection box 320 and the second horizontal axis 351 to selectively fix the second horizontal axis 351 to prevent rotation, Respectively.

9A and 10, the lock mechanism 400 includes a rotary plate 410 fixed to the second horizontal shaft 351 and rotated together with the rotary gear 352 and the circular handle 353, And a lock lever 430 installed on the inner wall of the box 320 so as to be rotatable about the center pin 420.

A plurality of locking grooves 411 are formed in the rotation plate 410 along the outer circumference and a locking pin 431 which is engaged with the locking groove 411 of the rotation plate 410 at one end And a handle 432 is provided at the other end of the lock lever 430 so that the locking position where the locking pin 431 is held by the locking groove 411 and the locking pin 431 are separated from the locking groove 411 As shown in Fig.

The first and second tension coil springs 441 and 442 are provided on the lock lever 430 so that one end of the first and second tension coil springs 441 and 442 is fixed to the lock lever 430, 430).

First and second elastic adjustment pins 443 and 444 are fixed to the other ends of the first and second tension coil springs 441 and 442. The first elastic adjustment pins 443 are formed on the inner wall of the protective box 320 The second elastic regulating fins 444 are inserted into the first or second unlocking holes 453 and 454 formed in the inner wall of the protective box 320. The first and second elastic regulating fins 444 and 442 are inserted into the first or second lock holes 451 and 452,

At this time, the positions of the first locking hole 451 and the first unlocking hole 453 are positioned farther away from the lock lever 430 than the positions of the second locking hole 452 and the second locking hole 454 So that the elasticity of the first and second tension coil springs 441 and 442 can be adjusted.

The second horizontal shaft 351, the circular handle 353, and the second rotary shaft 410 are fixed by inserting or separating the retaining pins 431 of the lock mechanism 400 into the retaining grooves 411 of the rotary plate 410, And the rotation of the traction roller 333 are artificially locked or unlocked.

4 and 8, when the hook 341 of the wire 340 is inserted into the hook 341 of the wire 340, When the tightening bolts 231 are loosened in the state where they are hooked on the pulling ring 342 of the light guide 220, the lightening junks 220 do not fall down due to their own weight, ).

Accordingly, the operator does not have to hold the light guide 220. Therefore, the operator can work to unfasten and fix the fixing bolt 231 of the light guide 220 using both hands and to fix the light guide 220 to the outer periphery of the pole 210 It is possible to conveniently carry out an operation of rotating the movable member 211 along its axis to change its position.

When opening the door 321 of the protective box 320 and rotating the circular handle 353 clockwise or counterclockwise in order to move the light guide bars 220 up and down, The driving gear 352 fixed to the driven gear 351 is rotated so that the driven gear 332 engaged with the driven gear 352 rotates and the pulling roller 333 fixed together with the first horizontal shaft 331 .

Accordingly, the wire 340 can be unwound or wound along the direction of rotation of the pulling roller 333, so that the light arm 220 can be moved upward and downward while being pulled, Since the light guide 220 can be pulled upward by using the pulling device 300 even after the position of the light guide 220 is changed, the light guide 220 can be firmly fixed and prevented from sagging due to its own weight .

At this time, by the lock mechanism 400 provided in the traction device 300, the rotation of the second horizontal shaft 351 is selectively locked or unlocked, and the light guide poles 220 are pulled and moved up and down Or can remain pulled from the stop position.

9A, the locking lever 430 is rotated to the unlocking position with the center pin 420 as the center, the engaging pin 431 is pulled out from the engaging groove 411 of the rotating plate 410 to be spaced apart The rotary plate 410 is released from the inner wall of the protective box 320 so that the worker can rotate the second horizontal shaft 351 and the circular handle 353 to rotate the driven gear 352 and the driven gear 332 The wire 340 can be wound or unwound by rotating the pulling roller 333 via the pulling roller 333 so that the operator can change the position by moving the lightening arm 220 upward or downward without being laborious.

At this time, the first elasticity adjusting pin 443 is moved from the first locking hole 451 to the second locking hole 452, and the second elasticity adjusting pin 444 is inserted into the second locking hole 454 Since the first unlocking hole 453 is located farther from the lock lever 430 than the second lock hole 452 when the first extension coil spring 442 is inserted into the first unlocking hole 453, The resilient restoring force of the first tension coil spring 441 is greater than the resilient restoring force of the first tension coil spring 441 so that the resilient restoring force is applied in the unlocking position direction of the lock lever 430, It is possible to reliably maintain the state of being separated from the light emitting element 411. Therefore, it is possible to prevent the malfunction that the latching pin 431 is inserted into the latching groove 411 due to the flow or vibration of the lock lever 430.

9B, the lock lever 430 is rotated to the lock position with the center pin 420 as the center, and the latch pin 431 is inserted into the latch groove 411 of the rotary plate 410 and held The rotary plate 410 is fixed to the inner wall of the protection box 320 so that the circular handle 353 and the driving gear 352 fixed to the second horizontal shaft 351 and the first horizontal shaft 331 cooperating therewith, It is possible to artificially fix the driven gear 332 and the pulling roller 333 of the driven gear 332 so as not to rotate.

As a result, it is possible to maintain the pulled state of the light guide wire 220 by the wire 340, so that the operator can easily work with both hands. Further, when the light guide wire 220 is pulled upward to maintain the pulled state The light guide bars 220 can be more firmly fixed and sagging due to their own weight can be prevented.

At this time, the first elastic adjustment pin 443, which is resiliently attached to the lock lever 430 by the first tension coil spring 441, is inserted into the first lock hole 451, and the second tension coil spring 442 is elastically When the second elasticity adjusting pin 444 is inserted into the second unlocking hole 454, the first locking hole 451 is located farther away from the lock lever 430 than the second unlocking hole 454 The resilient restoring force of the first tension coil spring 441 is greater than the resilient restoring force of the second tension coil spring 442 so that the resilient restoring force is applied in the lock position direction of the lock lever 430, It is possible to reliably maintain the state in which the rotation plate 410 and the lock lever 430 are retained in the retaining groove 411 of the rotation plate 410. The retaining pin 431 is prevented from moving from the retaining groove 411 by the flow or vibration of the rotation plate 410 and the lock lever 430 It is possible to prevent an erroneous operation from occurring.

210: Telephone pole 220:
221: first body 222: second body
223: horizontal support 224: support support
225: insulator 229: flange
230: elastic piece 231: fastening bolt
240: screw 250: power line
300: pulling device 310: fixing member
320: protective box 331: first horizontal axis
332: driven gear 333: traction roller
340: wire 341: hook
342: pulling ring 351: second horizontal axis
352: idler gear 353: circular handle
400: lock mechanism 410: spindle
420: center pin 430: lock lever
441,442: first and second tension coil springs 443, 444: first and second elastic adjustment pins
451, 452: first and second locking holes 453, 454: first and second unlocking holes

Claims (1)

A telescope 210 having a tapered cylindrical shape such that its diameter becomes larger toward the bottom; (220) having an insulator that is elastically pressed on the tapered outer peripheral surface (211) of the electric pole and supports the distribution line (250); And a pulling device (300) fixedly installed on the electric pole to lift the light load,
The light guide 220 may include a first metal body 221 formed to surround half the outer circumference of the main body 210; A metallic second body 222 coupled with the first body and the hinge 226 to be openable and closable in a horizontal direction and configured to surround the other half of the telephone pole; A metallic horizontal support 223 extending from the top of the second body and having an insulator 225 secured thereto; And a metallic support support (224) extending from a lower portion of the second body to a lower portion of the horizontal support to prevent deflection of the horizontal support,
The first body 221 and the second body 222 are formed so as to be tapered in the vertical direction and inclined in the direction of the telephone main body 210 to have upper and lower ends 227 for pressing the telephone main body 210; A central portion 228 connecting the upper and lower ends thereof and having an inner space not in contact with the electric pole; A flange (229) formed to protrude outward at the opening and closing portions of the first and second bodies; An elastic piece 230 mounted on the inner circumferential surface of the center portion 228 and contacting the outer circumferential surface of the main body 210; And a fastening bolt (231) for fastening the flanges of the first and second bodies to each other,
The pulling device 300 includes a fixing member 310 positioned at an upper portion of the light guide 220 and fixed to the pole 210; A protective box 320 fixed to the fixing member and having a door; A driven gear 332 and a traction roller 333 fixed to a first horizontal axis 331 rotatably installed on the inner wall of the protective box and rotating together with the first horizontal axis; A wire 340 wound around the pulling roller and having a hook 341 at its end; A pulling ring 342 formed on the light guide 220 to hook the hook 341 of the wire; A driving gear 352 fixed to a second horizontal shaft 351 rotatably installed on the inner wall of the protective box 320 and rotated together with the second horizontal shaft and engaged with the driven gear 332; A circular handle 353 fixed to the second horizontal shaft 351 to rotate the driving gear 352; And a locking mechanism 400 installed between the inner wall of the protective box 320 and the second horizontal shaft 351 for selectively fixing the circular handle 353 and the pulling roller 333 so as not to rotate,
The locking mechanism 400 includes a rotary plate 410 fixed to the second horizontal shaft 351 and rotating together with the driving gear 352 and having a plurality of locking grooves 411 formed along the outer circumference thereof; A locking pin 431 is provided on the inner wall of the protection box 320 so as to be rotatable about the center pin 420 and one end thereof is held in the locking groove 411 of the rotary plate and a handle 432 is provided at the other end A lock lever 430 which rotates between a lock position where the latching pin is held in the latching groove and an unlocking position in which the latching pin 431 is separated from the latching groove 411; First and second tension coil springs (441, 442) having one end fixed to the lock lever and disposed on both sides of the lock lever; First and second elastic adjustment pins (443, 444) fixed to the other ends of the first and second extension coil springs; First and second locking holes (451, 452) formed on an inner wall of the protection box (320) and into which the first elasticity adjusting pin (443) is inserted; And first and second unlocking holes (453, 454) formed in the inner wall of the protective box and into which the second elasticity adjusting pin (444) is inserted. The second lock hole (452) and the second lock hole 454) is spaced apart from the lock lever (430) by a distance between the first lock hole and the first lock release hole.

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