KR101211555B1 - Insulated arms for supporting distribution line - Google Patents

Abstract

PURPOSE: An insulated arm for supporting a power distribution line is provided to prevent damage to an insulator due to vibration by buffering the vibration due to the shaking of the power distribution line through a vibration reduction device. CONSTITUTION: First and second limit switches(S1,S2) are electrically connected to a controller on both sides of a bracket(32) comprising an extirpating device. A rotator(DT) transmitting a detection signal by being in contact with a reflective plate(33) is formed in the shape of a sphere for minimizing the interference with the reflective plate. The controller outputs a warning sound signal in different intensity or different warding sounds according to the rotating direction of the reflective plate in contact with the first and second limit switches. A speaker(SP) outputs the warning sound signal.

Description

Insulated Arms for Power Distribution Lines {Insulated Arms For Supporting Distribution Line}

The present invention relates to an insulated wrought iron for supporting transmission and distribution lines, and more particularly, an external force transmitted in a horizontal direction and a longitudinal direction by allowing a rocking or vibration received by a transmission line to be received through a vibration damping device installed on the insulator. The present invention relates to an insulated complete iron for supporting transmission and distribution lines having means for outputting different beeps depending on the direction of the wind so as to prevent damage to insulators caused by birds.

In general, wrought iron is a function of supporting the insulator installed on the pole and installed on the outer surface, and has only a function of supporting the insulator in which the transmission and distribution line is fixed.

On the other hand, the insulator is installed on the wrought iron to support the transmission line is not in electrical contact with the wrought iron, in order to install the transmission line on the insulator is normally loosely connected so that the middle part sag downwards because the worker pulls by hand There were a lot.

Therefore, when the wind blows strongly, the transmission and distribution line flows (rumbles), and the load or vibration generated as the transmission line flows is transmitted directly to the insulator, so that the insulator is damaged and loses its function or is badly. Frequent accidents caused by falling out of the plane and falling.

For example, such a conventional insulator is an example disclosed in Korean Patent No. 0989444 (October 15, 2010) "Jump line protection device for line post insulator".

The insulator according to the prior art is a horizontally mounted on the upper side of the body of the telephone pole, and a plurality of insulators are mounted on the upper side or the lower side of the complete body, a jumper for insulating the transmission and distribution wire cable and the ground on the upper side of the insulator The line is fixed.

Conventional insulator as described above has the advantage that it is very easy and simple to install the transmission and distribution wire cable, but when the coupling between the insulator and the complete, it must be installed or dismantled by using a separate tool (for example, a spanner), the operator must There was an uncomfortable problem that the tool must be carried.

Therefore, the need for a fixed insulator that can be easily installed and dismantled without the need for a separate tool in the coupling between the insulator and the completion has increased rapidly.

As part of this, Korean Patent No. 1 122717 (2012. 02. 24.) "Insulated Wrought Iron for Supporting Transmission Lines" has been disclosed.

By the way, the registered patent has a lack of part in the structure to drive the bird out or to prevent access to the bird has been requested to supplement it.

The present invention has been made in view of the above-mentioned problems in the prior art, and has been created to solve this problem, and is absorbed and absorbed through the vibration damping device installed on the insulator, which is transmitted to the transmission and distribution line by wind. It prevents damage to insulator due to external force transmitted in the direction, and it is very convenient to install and dismantle insulator on the support without using a separate tool. It is an object of the present invention to provide an insulated wire for supporting transmission and distribution lines, which implements an effective bird extermination function by providing means for outputting different warning sounds according to the direction of the wind.

The present invention provides a means for achieving the above object, the support body having a fixed body insertion hole penetrated up and down, installed on the pole; A lock bar movably installed on the support body and exposed to the upper portion; A spring installed in the support main body to spring the locking bar in one direction; A support consisting of an elastic piece installed on the bottom of the support main body so as to face each other with respect to the fixing body insertion hole: an insulator made of a ceramic material having an installation groove formed on the inner circumferential surface thereof with an opening upwardly in the center of the upper surface; A fixed body part having a projection extending downward from the bottom of the insulator and having an inverted triangular cross section on the circumferential surface, a lock bar receiving groove formed to face each other on the circumferential surface of the upper end of the fixed body body, and the fixed body part It is formed to face each other along the longitudinal direction on the lower end of the lower surface, consisting of a fixed body consisting of a locking release groove and a release release groove perpendicular to each other, and is detachably inserted into the fixed body insertion hole of the support via the fixing body. An insulator fixed by the locking bar and the bullet piece: a bending rubber detachably installed on the circumferential surface of the insulator; A bracket extending horizontally from the bending rubber; Repelling mechanism rotatably installed on the bracket and composed of a reflecting plate for reflecting light: having a guide portion formed in the longitudinal direction on both sides and a fastening portion formed in the center of the bottom surface, is fastened to the installation groove of the insulator through the fastening portion A vibration damping device body made of an insulating material; A first shock absorbing member for accommodating up and down vibrations by pressing and fixing the transmission and distribution line through one end of the accommodating groove, the other end penetrating the body of the vibration damping device, and the wire fixing part formed at the upper end of the other end; ; A pair of wire restraining members having a wing piece protruding outwardly and movably installed in the guide portion and pressurizing and fixing the outer surface of the transmission and distribution line; One end and the other end is respectively fixed to the wing piece of the pair of wire retaining member and includes a vibration damping device consisting of a second buffer member for receiving the vibration of the transmission line stretched in the longitudinal direction, both sides of the bracket constituting the elimination mechanism Each of the first and second limit switches electrically connected to the control unit is further provided, wherein the first and second limit switches come out from the tip to minimize the interference with the reflector by the fluid transmitting the detection signal in contact with the reflecting plate. It is formed in a spherical shape, the control unit outputs a warning sound signal with different warning sounds or different output strengths in accordance with the rotation direction of the reflector in contact with the first and second limit switch, is installed on a portion of the bracket and the control unit The speaker is electrically connected and further comprising a speaker for inputting and outputting the warning signal. Wancheol provides insulation for wire support.

According to the present invention, by absorbing and buffering the vibration due to the oscillation of the transmission line through the vibration damping device to prevent the insulator from being damaged by the vibration, it is possible to work without having to carry a separate tool, convenient, depending on the direction of the wind By outputting different sounds there is an advantage that can prevent birds from accustomed to the sound to prevent sitting or nesting on the support.

1 is a reference diagram showing an installation state of the insulated rod for transmission and distribution line support according to the present invention.
Figure 2 is an exploded perspective view of the insulated cast iron for transmission and distribution line support according to the present invention.
Figure 3 is a front view showing a partial cross-section of the insulated rod for transmission line support according to the present invention.
Figure 4 is a plan view of the insulated cast iron for transmission line support according to the present invention.
5a to 5c is a flow chart for explaining the installation and dismantling process of the insulated wire for supporting transmission and distribution lines according to the present invention.
6 is an exemplary view showing another example of further improving the function of the reflector according to the present invention.

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

Before describing the present invention, the following specific structural or functional descriptions are 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. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

The present invention utilizes the previously registered patent No. 1 122717 to be described later. Therefore, the features of the device configuration described below are all those described in the registered patent number 122717.

However, the present invention is a configuration that further strengthens the structure of the warning sound can be transmitted according to the direction of the wind in order to prevent the access of birds in advance of the configuration disclosed in the Patent No. 1 122717, this part is the most essential Constructive features.

Therefore, the device configuration, features and operation relations described below will be referred to the contents of the Patent No. 1122717 as it is, and will be described in detail with respect to the configuration associated with the main features of the present invention at the rear end.

Referring to FIG. 1, an insulated iron for supporting a transmission and distribution line according to the present invention includes a support 10, an insulator 20, a elimination mechanism 30, and a vibration damping device 40.

1 to 3, the support 10 is composed of a support main body 11 and the lock bar 12, the spring 13 and the ballistic piece 14 is installed on the pole 1.

The support main body 11 is a rectangular bar made of metal or synthetic resin material. In the embodiment of the present invention, a fixed body insertion hole 11a penetrated up and down is formed at one end of the support main body 11. In particular, the support main body 11 is provided with an installation groove (not shown) in which one side is opened to the upper surface so that the lock bar 12 can be installed to be movable, and the other side is opened to the fixing body insertion hole 11a. .

The fixing body 22 of the insulator 20 to be described later is inserted into the fixing body insertion hole 11a, and the fixing body 22 of the inserted insulator 20 has a locking bar 12 and a bullet piece 14. It is fixed by).

The locking bar 12 is to form a 'b' shape of the synthetic resin as a whole, is installed to be movable in the installation grooves (not shown) of the above-mentioned support base body 11, the lock bar for the insulator 20 Inserted into the groove (22b) serves to limit the rotation of the insulator 20 about the vertical axis.

The spring 13, as shown in Figure 2, is built into the support main body 11 to function to shoot the locking bar 12 in one direction.

The ballistic piece 14 is made of a 'b' shape as a whole, made of a metal or synthetic resin material having an elastic force, in the embodiment of the present invention is formed on the bottom surface of the support main body 11, fixed body insertion hole (11a) It is installed to face each other on the basis of.

Here, the bullet tip 14 has a function of fixing one end portion between the protrusions 22a-1 of the insulator 20 so that the insulator 20 is not separated from the support 10.

2 and 3, the insulator 20 is composed of an insulator 21 and a fixed body 22 so as to be detachably installed on the support 10 via the fixed body 22, and a transmission and distribution line ( L) is fixed and supported via the insulator 21 so that the L 10 is not in electrical contact with the support 10.

The insulator 21 is made of a ceramic material, and in particular, an installation groove 21a is formed in the center of the upper surface, and the air cylinder 42a of the first buffer member 42 is described later in the installation groove 21a. Is inserted. In addition, a screw tab is formed on the inner circumferential surface of the installation groove 21a to be easily coupled with the fastening portion 41b of the vibration damping device 40.

The fixture 22 is a bolt-type mechanism made of a metal material, which extends downward from the bottom of the insulator 21 and has a protrusion 22a-1 having a reverse triangular cross section on the circumferential surface. (22a); A lock bar receiving groove 22b formed to face each other on the circumferential surface of the upper end of the fixed body portion 22a; It is formed to face each other along the longitudinal direction on the lower end of the fixed body portion 22a in the longitudinal direction, consisting of a carb release release groove 22c perpendicular to the lock bar receiving groove (22b), the insulator (21) It is formed integrally.

Since the insulator 21 and the fixture 22 are integrally formed in various ways, description thereof will be omitted.

According to the embodiment of the present invention, when the fixing body 22 is inserted into the fixing body insertion hole 11a of the support 10, the locking bar 12 is provided in the locking bar receiving groove 22b of the fixing body 22. One end of the fixed body 22 is prevented from being rotated about the vertical axis, and between the projections 22a-1, the one end of the bullet piece 14 is inserted so that the fixed body 22 has a fixed body insertion hole. The departure from 11a is blocked.

On the other hand, in the case where the fixing body 22 installed as described above is to be separated from the fixing body insertion hole 11a, the fixing body 22 is set in the state in which the lock bar 12 exposed to the upper surface of the support base body 11 is retracted. ) Is rotated about the vertical axis so that one end of the elastic piece 14 is positioned in the elastic release groove 22c of the fixing body 22, and then lifts the fixing body 22 and pulls it out. .

Therefore, since the insulator 20 can be easily installed and released on the support 10 without a separate tool (for example, a screwdriver or a spanner) for installation or dismantling, there is an advantage in that the work is very convenient for the worker. .

The elimination mechanism 30 is composed of a banding rubber 31, a bracket 32 and a reflecting plate 33, and is detachably installed on the circumferential surface of the insulator 21 so that the bird sits or sits on the transmission line L. Prevents nesting in the plant.

The bending rubber 31 is a rubber ring having elasticity, and in the embodiment of the present invention, is detachably installed on the circumferential surface of the insulator 21.

The bracket 32 extends horizontally from the bending rubber 31, and the distal end forms a 'C' shape, and the reflecting plate 33 rotates through an axis (not shown) on the inner circumferential surface of the 'C' shape. It is possible to install.

The reflective plate 33 is a known mirror or a smooth metal plate that can reflect light, and is rotatably installed on the bracket 32 to reflect light.

According to the embodiment of the present invention, the light is reflected by the reflecting plate 33 to the surrounding, by interfering with the view of the bird through the reflected light, the bird sits on the transmission line (L) or the support (10) There is an advantage to prevent nesting in.

2 to 4, the vibration damping device 40 is composed of a vibration damping device body 41, the first buffer member 42, the wire retaining member 43 and the second buffer member 44. . The vibration attenuating device 40 is severely swung left and right and up and down when the transmission and distribution line L is subjected to wind pressure (wind power), and serves to minimize the transmission to the insulator 20 by attenuating the vibration caused by the rocking. Do it.

The vibration damping device main body 41 is a bar having a cross-section of a letter 'c', using an insulating material. Guide portions 41a are formed on both side surfaces thereof in a longitudinal direction, and fastening portions 41b having thread tabs formed on outer circumferential surfaces of the bottom surface center are formed so as to be mutually fastened to the installation grooves 21a of the insulator 20. In particular, the center of the fastening portion 41b penetrates up and down because the cylinder rod 42b of the first buffer member 42 is elevated.

The first buffer member 42 is a known air spring consisting of an air cylinder 42a filled with air therein and a cylinder rod 42b which is installed to be liftable on the air cylinder 42a. It is a mechanism for receiving (absorbing) the vibration up and down of the transmission and distribution line (L) by the transfer to the insulator 20. In particular, the wire fixing part 42b-1 for fixing the transmission and distribution line (L) is installed on the upper surface of the cylinder rod (42b), the installation method is to force the transmission and distribution line (L) by pushing between the cut groove do.

The wire retaining member 43 is a mechanism that is movable in the guide portion 41a.

In particular, the wing piece 43a protruding outward is formed on both sides of the wire retaining member 43, so that it can be movable to the guide portion 41a. The wire holding member 43 can also easily fix the transmission and distribution line (L) through a cut formed in the center.

The second shock absorbing member 44 is the same air spring as the first shock absorbing member 42. If the first shock absorbing member 42 is a device for receiving (absorbing) up and down vibrations, the second shock absorbing member 44 Is a device that receives (absorbs) vibrations in the horizontal direction (length direction) from side to side.

Therefore, the configuration is also composed of the air cylinder 44a and the cylinder rod 44b in the same manner as the first buffer member 42.

The second shock absorbing member 44 is fixed between the air cylinder 44a and the tip of the cylinder rod 44b between the blade pieces 43a of the pair of wire retaining members 43 via pins.

The vibration damping device 40 is a device for supporting the transmission and distribution line (L) flowing electricity is preferably made of an insulating material.

Referring to the installation process and operation of the present invention made of a configuration as described above are as follows.

Referring to FIGS. 5A to 5C, first, the support on which the fixing body 22 of the insulator 20 is installed on the pole 1 in a state in which the insulator 20 having the elimination mechanism 30 is gripped by hand. Insert into the fixed body insertion hole 11a of (10).

In more detail, when the fixing body 22 is inserted into the fixing body insertion hole 11a, the bullet pieces 14 disposed to face each other based on the fixing body insertion hole 11a are fixed body ( 22 is pushed open by the projection 22a-1, and when the fixing body 22 is completely inserted into the fixing body insertion hole 11a, the shot pieces 14, which are opened, are restored by the restoring force and the protrusion 22a-1. By being inserted between the), the fixing body 22 is firmly fixed so as not to be separated in the inserted direction.

At this time, one end of the lock bar 12 installed in the support body 11 is inserted into the lock bar receiving groove 22b of the fixed body 22, and the fixed body 22 is locked by the lock bar 12. The rotation about the vertical axis is restricted.

After fixing the insulator 20 to the support 10 as described above, insert the e-cylinder 42a of the vibration damping device 40 into the installation groove 21a of the insulator 20, and the fastening portion 41b is inserted. After fastening by the medium, the transmission and distribution line (L) is fixed to the wire fixing portion (42b-1) and a pair of wire holding member 43, respectively.

As described above, the reflection plate 33 of the extinguishing mechanism 30 is fully reflected in the state in which it is installed, by interfering with the bird's field of view through the reflected light, the bird on the transmission line (L) There is an advantage that can prevent sitting or nesting on the support (10).

On the other hand, when replacing the insulator 20 installed on the support 10 for maintenance, the locking bar 12 inserted in the lock bar receiving groove 22b of the fixed body 22 is retracted. In a state in which the fixing body 22 is rotated about a vertical axis so that one end of the elastic piece 14 is positioned in the elastic release groove 22c of the fixing body 22, then the fixing body 22 is elevated. It is easily disassembled when it is withdrawn outside.

Subsequently, the operation of the insulated cast iron for transmission and distribution line support according to the present invention will be described.

As shown in FIG. 1, when the insulated perfect iron according to the present invention is blown by a weak wind in the installed state, the movement of the transmission and distribution line L is weakly swayed left and right (length direction) and up and down.

In this case, as shown in Figures 3 and 4, the vibration transmitted up and down is accommodated (absorbed) by the first buffer member 42 of the vibration damping device 40, the vibration transmitted in the longitudinal direction is second The buffer member 44 is accommodated (absorbed).

In more detail, when the first shock absorbing member 42 vibrates up and down, the cylinder rod 42b is lowered to the air cylinder 42a together with the up and down of the transmission and distribution line L. And it is possible to accommodate (absorb) vibration by compressing and relaxing the air therein while repeating the lifting and lowering.

In addition, in the case of the second buffer member 44, a pair of wire retaining members 43 fixing the transmission and distribution lines L move along the length direction due to the oscillation in the left and right (length directions). The air cylinder 44a and the cylinder rod 44b of the two-buffer member 44 receive (absorb) vibration in the longitudinal direction while repeating compression and relaxation.

Therefore, the vibration damping device 40 operates accordingly when the transmission line L is relaxed or contracted in summer and winter, and thus prevents damage to the transmission line L due to changes in weather. Can be.

According to a preferred embodiment of the present invention, by receiving (absorbing) the vibration due to the oscillation of the transmission and distribution line (L) through the vibration damping device 40, it is possible to prevent the insulator 20 from being damaged by the vibration.

In addition, since the insulator 20 installed on the support 10 can be easily installed and released without a fastening means, the operator does not need to carry a separate tool, and the work time is dramatically shortened, thereby making the work very convenient. There is this.

In addition, by interfering with the view of the bird by reflecting the sun light through the eradication mechanism 30 installed in the insulator 20, the bird sitting on the transmission line (L) or nesting on the support 10 There is an advantage that can be prevented.

In addition, in another embodiment of the elimination mechanism 30 according to the present invention, it may have a form as shown in FIG.

That is, the elimination mechanism 30 includes a mirror reflector 33, ie, a reflector 33 rotatably installed under the support of the bracket 32, as described above, but according to the direction of the wind reflector 33 The sensor may further include a speaker and a speaker to transmit different warning sounds when the direction of rotation of the device changes.

To this end, as shown in Figure 6, the first limit switch (S1) and the second limit switch (S2) is provided on both sides of the bracket 32 for supporting the reflection plate 33, respectively.

In this case, the first and second limit switches (S1, S2) is provided with a switch in the form of the original position by the elastic repulsive force when the contact occurs while the interference occurs with the rotating reflector 33, the contact, For smoothness of operation and prevention of defects in case of interference, the tip of the switch DT, that is, a kind of switch rod, which performs a switching operation should be formed in a spherical shape.

Thus, it can be easily pushed in without coming into contact with the reflecting plate 33, thereby enabling a smooth detection operation.

In addition, the first and second limit switches S1 and S2 are electrically connected to the control unit 60, and the control unit 60 is in contact with the first and second limit switches S1 and S2 and the reflector plate 33. It can be programmed or circuit designed to send out various types of melodies or beeps in order.

This is because the direction in which the reflector 33 is rotated varies depending on the direction of the wind. For example, when the detection is performed in the order of the first limit switch S1 to the second limit switch S2, or the second limit switch. (S2) → When the detection is performed in the order of the first limit switch S1, when only the first limit switch S1 is detected, or when only the second limit switch S2 is detected. Different beeps or melodies can be sent or output.

As another example, the output sound volume may be set differently according to various combinations as described above. That is, the warning sound signal including the melody may be output with different output strengths.

In this case, the algae are always used to output the same sound, and thus the behavior of disregarding the algae does not appear, and the algae may always hear a new warning sound, and thus may not easily approach, and even if they approach, they may frighten away.

In addition, to implement this, it should include a speaker (SP) which is an output mechanism, the speaker (SP) is preferably a high output speaker, is fixed to a part of the bracket 32 as shown, and electrically connected to the control unit 60 Connected.

As such, in the present invention, by including a configuration that can be very simple but can make a variety of changes, in addition to the shock absorbing function of the wire flow in the art, to prevent electric shock accidents, to provide a robust and stable support, to minimize the impact of the bird, etc. It can be implemented.

1: Jeonju L: Transmission Line 10: Support
11: support body 11a: fixing body insertion hole 12: locking bar
13: spring 14: bullet shell 20: distribution line support
21: Insulator 21a: Distribution line seating groove 22: Fixture
22a: fixed body portion 22a-1: projection 22b: lock bar receiving groove
22c: bullet release groove 30: eradication mechanism 31: banding rubber
32: bracket 33: reflector 40: vibration damping device
41: vibration damping unit body 41a: guide portion 41b: fastening portion
42: first buffer member 42a: air cylinder 42b: cylinder rod
43: wire holding member 43a: wing piece 44: second buffer member
44a: air cylinder 44b: cylinder rod 60: control unit
S1: first limit switch S2: second limit switch SP: speaker

Claims (1)

A support base body 11 having a fixed body insertion hole 11a penetrated up and down and installed in the electric pole 1; A locking bar 12 movably installed in the support main body 11 and exposed upward; A spring 13 installed in the support main body 11 to spring the locking bar 12 in one direction; A support 10 consisting of an elastic piece 14 which is installed on the bottom of the support base body 11 so as to face each other with respect to the fixing body insertion hole 11a: an installation groove which opens upward in the center of the upper surface and has a screw tab formed on the inner circumferential surface thereof. An insulator 21 made of ceramic material provided with a 21 a; On the circumferential surface of the upper end of the fixed body portion 22a and the fixed body portion 22a in which the projection 22a-1 extending downward from the bottom of the insulator 21 and having an inverted triangular cross section on the circumferential surface is formed repeatedly. Lock bar receiving groove (22b) formed to face each other, formed on the circumferential surface of the lower end of the fixed body portion 22a to face each other in the longitudinal direction, the ball bar pieces perpendicular to the lock bar receiving groove (22b) It consists of a fixing body 22 made of a release groove (22c), and is detachably inserted into the fixing body insertion hole (11a) of the support 10 via the fixing body 22, the locking bar 12 and the bullet piece Insulator 20 fixed by 14: a bending rubber 31 detachably installed on the circumferential surface of the insulator 21; A bracket 32 extending horizontally from the bending rubber 31; Reduction mechanism (30) rotatably installed on the bracket (32) and configured to reflect light: guide portions (41a) formed in both sides along the longitudinal direction, and fastening portions (41b) formed at the bottom center And a vibration damping device body 41 of insulating material, which is fastened to the installation groove 21a of the insulator 21 through the fastening part 41b; One end is accommodated in the installation groove 21a of the insulator 21, the other end penetrates the vibration damping device main body 41, and the transmission and distribution line L via the wire fixing part 42b-1 formed at the upper end of the other end. A first buffer member 42 for receiving the vibration up and down by pressing and fixing); A pair of wire restraining members 43 having a wing piece 43a projecting outwardly and movably installed in the guide part 41a, for pressurizing and fixing the outer surface of the transmission and distribution line L; Vibration damping device composed of a second buffer member 44, one end and the other end of which is fixed to the wing pieces 43a of the pair of wire retaining members 43 to receive the vibration of the transmission and distribution line L, which is stretched in the longitudinal direction. Including 40,
Both sides of the bracket 32 constituting the elimination mechanism 30 are further provided with first and second limit switches S1 and S2 electrically connected to the control unit 60, respectively.
The first and second limit switches S1 and S2 are spherically shaped so as to minimize the interference with the reflector 33 while the float DT that is in contact with the reflector 33 and transmits a detection signal while being protruded from the tip. Become,
The control unit 60 outputs a warning sound signal with different warning sounds or different output strengths according to the rotation direction of the reflector 33 in contact with the first and second limit switches S1 and S2,
It is installed on a part of the bracket 32 and electrically connected to the control unit 60, the speaker (SP) for inputting and outputting the warning sound signal is further installed, characterized in that the transmission wire support.

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