Abstract:
The present invention relates to a welding helmet including a wireless auto light shield part and a controlling method thereof. More particularly, the present invention relates to a welding helmet including a wireless auto light shield part capable of improving convenience of a welding operation, protecting eyes of a worker from direct light during welding operation, and preventing frost from being formed on the viewing window by shielding or opening a viewing window through elevation of a shield glass while automatically driving the light shield part in a wireless scheme by operation of a torch switch, and a method of controlling the same.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    Field of the Invention 
         [0002]    The present invention relates to a welding helmet including a wireless auto light shield part and a controlling method thereof. More particularly, the present invention relates to a welding helmet including a wireless auto light shield part capable of improving convenience of a welding operation, protecting eyes of a worker from direct light during welding operation, and preventing frost from being formed on the viewing window by shielding or opening a viewing window through elevation of a shield glass while automatically driving the light shield part in a wireless scheme by operation of a torch switch, and a method of controlling the same. 
         [0003]    Related Art 
         [0004]    In general, welding is a process which directly combines the same type of different types of metallic materials with each other by locally applying heat or pressure to the metallic materials. Since strong light is emitted and fragments are bounced upon a welding operation, if the worker&#39;s eyes are exposed to light, a sight may be damaged and the worker&#39; eyeballs may be damaged due to fragments. 
         [0005]    Accordingly, when the welding operation is performed, strong light is shielded for protecting a welder&#39;s eyes from harmful materials, and the welder performs a welding operation while wearing a welding helmet to protect the worker&#39; face from spark to be generated during the welding. 
         [0006]    A welding helmet according to the related art includes a face protection surface configured to protect a face of a worker from spark fragments scattered during a welding operation, a viewing window located in the face protection surface so that the worker may perform the welding operation while directly confirming a welding region, and a wearing unit configured to allow a worker to perform the welding operation while adhering the face protection surface to the worker&#39; face. The viewing window is provided therein with a light shield glass. 
         [0007]    After the worker recognizes a welding position and a relation position between an object to be welded and a welding rod by opening the viewing window after starting the welding, the worker&#39; eyes are protected from direct light emitted during welding by shielding the viewing window by the light shield glass after starting the welding when the welding starts. 
         [0008]    According to the related art, the sight is ensured by lifting the shield glass upward from the face protection surface before the welding starts. During the welding, an operation of shielding the viewing window is repeated by putting the shield glass down. The above method is considerably complicated and increases fatigue of arms. 
         [0009]    Further, according to the related art, since the welding helmet is supported while being worn in a head part of a worker, if the worker bends or bridles, a weight of the welding helmet concentrates upon a neck part of the worker so that fatigue of the worker is significantly increased during the welding operation. 
       SUMMARY OF THE INVENTION 
       [0010]    The present disclosure has been made in view of the above problems, and provides a welding helmet including a wireless auto light shield part capable of improving convenience of a welding operation, protecting eyes of a worker from direct light during welding operation, and preventing frost from being formed on the viewing window by shielding or opening a viewing window through elevation of a shield glass while automatically driving the light shield part in a wireless scheme by operation of a torch switch, and a method of controlling the same. 
         [0011]    The present invention further provides a welding helmet including a wireless auto light shield part for preventing frost from being formed on the viewing window so that air may circulate inside the welding helmet, and a method of controlling the same. 
         [0012]    The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. 
       Technical Solution 
       [0013]    In accordance with an aspect of the present invention, there is provided a welding helmet including a wireless auto light shield part connected to a welder body through a cable, and is used together with a torch including a torch switch during welding, the welding helmet including: a helmet body including a rear surface which is open, a space portion being formed at an inner side the helmet body, and a viewing window is provided at a front surface of the helmet body; a light shield glass located rearward of the viewing window; a light shield part configured to elevatably connect the light shield glass to the helmet body, and to open or shield the viewing window by elevating the light shield glass; a driving part configured to transfer power to the light shield part; a first wireless communication unit configured to receive a switching signal according to an on/off operation of the torch switch; and a first control unit configured to receive the switching signal from the first wireless communication unit to control the driving part so that the viewing window is open or shielded while elevating the light shield glass. 
         [0014]    The welding helmet including a wireless auto light shield part may further include: a second wireless communication unit configured to detect an on/off operation of the torch switch; and a second control unit configured to receive the switching signal from the second wireless communication unit to control drive of the welder body so that welding starts or is terminated. 
         [0015]    The welding helmet including a wireless auto light shield part may further include: a lighting part provided in the helmet body to illuminate a front direction of the helmet body, wherein the lighting part is located at an upper portion of the viewing window and includes: an LED module including a plurality of LEDs provided at a front surface of the helmet body and a printed circuit board connected with the LEDs; a power supply configured to supply power to the LED module; and a power switch configured to turn-on/off the LEDs. 
         [0016]    The welding helmet including a wireless auto light shield part may further include: a wearing part worn on a shoulder of a worker to support the helmet body, wherein the wearing part includes a pair of wearing bars having a curved shape where a center thereof protrudes upward, a wearing frame including a connection bar configured to connect rear ends of the pair of wearing bars to each other, a connector configured to connect the wearing frame to the helmet body, and a wearing portion configured to wear the wearing frame in the worker. 
         [0017]    The connector may include: a pair of first connection members provided at the pair of wearing bars, respectively; a pair of second connection members provided at both sides of the helmet body, respectively; and a pair of flexible bars including bottom ends connected to the first connection member and top ends connected to the second connection member, respectively, wherein each of the pair of first connection members may include: a first frame including both ends and one end connected to the wearing bar, a second frame including both ends and an opposite end connected to a bottom end of the flexible bar, and a first control lever configured to connect an opposite end of the first frame to one end of the second frame, and to control rotation of the second frame, and each of the pair of second connection members includes a third frame including both ends and one end connected to a top end of the flexible bar, and a second control lever configured to connect an opposite end of the third frame to the helmet body, and to control rotation of the helmet body. 
         [0018]    The driving part may include a drive motor, and the light shield part includes first and second guide bars which are located both sides of a rear surface of the viewing window and including top and bottom ends fixed to upper and lower portions of the inner casing, a guide frame configured to elevatably connect an opposite side of the light shield glass to the second guide bar, and a drive assembly configured to elevatably connect one side of the light shield glass with the first guide bar, to connect the driving part with the light shield glass, and to elevate the light shield glass according to drive of the driving part. 
         [0019]    The drive assembly may include: a rack configured to elevatably connect one side of the light shield glass to the first guide bar; and a pinion configured to receive a rotating force from the driving part to elevate the rack. 
         [0020]    The light shield part may further include upper and lower limit sensors making contact with the light shield glass to stop drive of the drive motor when the light shield glass elevates to a lower limit position or an upper limit position. 
         [0021]    The welding helmet including a wireless auto light shield part may further include a blowing fan for preventing frost to be formed on the viewing window by exhausting internal air of the helmet body to an exterior. 
         [0022]    In accordance with another aspect of the present invention, there is provided a method of controlling a welding helmet including a wireless auto light shield part, the method including: receiving an ON signal of a torch switch to transfer the ON signal to the first and second control units, respectively by the first wireless communication unit and the second wireless communication unit when the torch switch is turned-on; the light shield glass falls a lower limit position according to drive of the driving part to shield the viewing window when the ON signal of the torch switch is input to the first control unit; the welder body is operated to supply power to the torch so that welding starts when the ON signal of the torch switch is input to the second control unit; receiving an OFF signal of the torch switch to transfer the OFF signal to the first and second control units, respectively by the first wireless communication unit and the second wireless communication unit when the torch switch is turned-off; driving the driving part to lift the light shield glass to an upper limit position to open the viewing window when the OFF signal of the torch switch is input to the first control unit; and stopping the drive of the welder body to block supply of power to the torch so that the welding is not performed when the OFF signal of the torch switch is input to the second control unit. 
         [0023]    The second control unit may drive the welder body when a predetermined time elapses when the ON signal of the torch switch is received. 
         [0024]    The first control unit may drive the driving part when a predetermined time elapses after the OFF signal of the torch switch is received. 
       Effects of the Present Invention 
       [0025]    The present invention can improve convenience of a welding operation, protect eyes of a worker from direct light upon welding, and prevent frost from being formed on the viewing window by shielding or opening a viewing window through elevation of a shield glass while automatically driving a shield part by operation of a torch switch without including a separate operation switch. 
         [0026]    Further frost can be prevented from being formed on the viewing window so that air may circulate inside the welding helmet. 
         [0027]    Meanwhile, other various effects may be directly or indirectly disclosed in the following description of the embodiment of the disclosure. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0028]      FIG. 1  is a conceptual diagram schematically illustrating a welding helmet including a wireless auto light shield part according to the present invention. 
           [0029]      FIG. 2  is a perspective view illustrating a helmet body of the welding helmet including a wireless auto light shield part according to the present invention. 
           [0030]      FIG. 3  is a perspective view illustrating a wearing part of the welding helmet including a wireless auto light shield part according to the present invention. 
           [0031]      FIG. 4  is a rear view illustrating a helmet body of the welding helmet including a wireless auto light shield part according to the present invention. 
           [0032]      FIG. 5  is an exploded perspective view illustrating a casing of the welding helmet including a wireless auto light shield part according to the present invention. 
           [0033]      FIG. 6  is a rear view illustrating a light shield part of the welding helmet including a wireless auto light shield part according to the present invention. 
           [0034]      FIG. 7  is a flowchart illustrating a method of controlling a welding helmet including a wireless auto light shield part according to the present invention. 
       
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0035]    Hereinafter, preferred embodiments of the present invention will be described with reference to accompanying drawings. 
         [0036]      FIG. 1  is a conceptual diagram schematically illustrating a welding helmet including a wireless auto light shield part according to the present invention. Referring to  FIG. 1 , a welding helmet  1  including a wireless auto light shield part (hereinafter referred to as ‘welding helmet’) is connected to a welder body  100  through a cable  101 , and is used together with a torch  200  including a torch switch  210  during welding, and includes: a helmet body  10 , a light shield glass  20 , a light shield part  30 , a driving part  40 , a first wireless communication unit  50 , and a first control unit  60 . 
         [0037]    A rear surface of the helmet body  10  is open, a space portion  11  is formed at an inner side the helmet body  10 , and a viewing window  12  is provided at a front surface of the helmet body  10 . The light shield glass  20  is located rearward of the viewing window  12 . The light shield part  30  elevatably connects the light shield glass  20  to the helmet body  10 , and opens or shields the viewing window  12  by elevating the light shield glass  20 . 
         [0038]    The driving part  40  transfers power to the light shield part  30 . The first wireless communication unit  50  receives a switching signal according to an on/off operation of the torch switch  210 . The first control unit  60  receives the switching signal from the first wireless communication unit  50  to control the driving part  40  so that the viewing window  12  is open or shielded while elevating the light shield glass  20 . 
         [0039]    A head of a worker is received in the space portion  11 . The worker ensures a sight through the viewing window  12  while a face makes contact with or is close to an inner surface forming the space portion  11 . The welder body  100  receives power from an exterior to generate a voltage for generating each electrode. The torch  200  is connected to the welding body through the cable  101 , and an electrode is installed at the torch  200 . If the torch switch  210  is turned-off in a state that the power from the welder body  100  is applied to the torch switch  210 , the light shield part  30  lifts the light shield glass  20  under drive of the driving part  40  to open the viewing window  12 . Further, if the torch switch  210  is turned-on, the light shield part  30  falls the light shield glass  20  under drive of the driving part  40  to shield the viewing window  12 . 
         [0040]    The welder body  100  receives power from an exterior to generate a voltage for generating each electrode. The welder body  100  receives a switching signal according to an on/off operation of the torch switch  210  to be turned-on/off. To this end, the welding helmet includes a second wireless communication unit  51  configured to detect an on/off operation of the torch switch  210  and a second control unit  61  configured to receive the switching signal from the second wireless communication unit  51  to control drive of the welder body so that welding starts or is terminated. It is preferable that the second wireless communication unit  51  and the second control unit  61  are included in the welder body, and may receive power from the welder body  100 . 
         [0041]      FIG. 2  is a perspective view illustrating a helmet body of the welding helmet including a wireless auto light shield part according to the present invention. Referring to  FIG. 2 , the welding helmet  1  further includes a lighting part  80  which is provided in the helmet body  10 . The lighting part  80  is located at an upper portion of the viewing window  12  and includes an LED module  81 , a power supply  84 , and a power switch  85 . The LED module  81  includes a plurality of LEDs  82  provided at a front surface of the helmet body  10  and a printed circuit board (PCB)  83  connected with the LEDs  82 . The power supply  84  supplies power to the LED module  81 . The power switch  85  turns-on/off the LEDs  82 . The power supply  84  includes a battery  86  and is connected to the power switch  85  and the LED module  81  through a power wire (not shown). The power supply  84  and the power switch  85  may be included in the helmet body  110  or a wearing part  90  to be described later. It is preferable that the LED module  81  is disposed forward of the viewing window  12 . The LED module  81  is disposed forward of the viewing window  12  for the purpose of preventing glare due to the LEDs  82 . The lighting part  80  may include a cover  81   a  configured to cover the LED module  81 . The cover  81   a  may protect the LED module  81  and may allow light illuminated from the LEDs  81  to widely spread. 
         [0042]      FIG. 3  is a perspective view illustrating a wearing part of the welding helmet including a wireless auto light shield part according to the present invention. Referring to  FIG. 3 , the welding helmet further includes a wearing part  90  worn on a shoulder of a worker to support the helmet body  10 . The wearing part  90  supports the helmet body  10  not to transfer a weight of the helmet body  10  to a head of the worker. To this end, the wearing part  90  includes a pair of wearing bars  92  having a curved shape where a center thereof protrudes upward, a wearing frame  91  including a connection bar  93  configured to connect rear ends of the pair of wearing bars  91  to each other, a connector  94  configured to connect the wearing frame  91  to the helmet body  10 , and a wearing part  95  configured to wear the wearing frame  91  in a worker. The pair of wearing bars  92  is placed on both shoulders of the worker. 
         [0043]    The connection bar  93  is located at a rear side of a body of the worker. The connector  94  includes a pair of first connection members  96  provided at the pair of wearing bars  92 , respectively, a pair of second connection members  97  provided at both sides of the helmet body  10 , respectively, and a pair of flexible bars  98  including bottom ends connected to the first connection member  96  and top ends connected to the second connection member  97 , respectively. The pair of the flexible bars  98  support the helmet body  10  from the wearing frame  91  and are bent due to external pressing. Each of the pair of first connection members  96  include a first frame  96  including both ends and one end connected to the wearing bar  91 , a second frame  96   b  including both ends and an opposite end connected to a bottom end of the flexible bar  98 , and a first control lever  96   c  configured to connect an opposite end of the first frame  96   a  to one end of the second frame  96   b , and to control rotation of the second frame  96   b . The first control lever  96   c  is screwed to the first and second frames  96   a  and  96   b . According to tightening and looseness, the first control lever  96   c  controls rotation of the helmet body  10  synchronized to rotation of the second frame  96   b.    
         [0044]    Each of the pair of second connection members  97  includes a third frame  97   a  including both ends and one end connected to a top end of the flexible bar  98 , and a second control lever  97   b  configured to connect an opposite end of the third frame  97   a  to the helmet body  10 , and to control rotation of the helmet body  10 . The second control lever  97   b  is screwed to the third frame  97   a  and controls rotation of the helmet body  10  according to tightening and looseness. The wearing part  95  includes a body string  95   a  connected to a front surface of the connection bar  93 , a pair of shoulder strings  95   b  including a rear end connected to the body string  95   a  and a front end extending along the wearing bar  92 , a pair of cohesion strings  95   c  configured to connect the pair of shoulder strings  95   b  to both ends of the body string  95   a , and a cohesion member  95   d  configured to cohere the both ends of the body string  95   a  to each other or to release the cohesion. The cohesion member  95   d  may include male and female buckles. 
         [0045]      FIG. 4  is a rear view illustrating a helmet body of the welding helmet including a wireless auto light shield part according to the present invention.  FIG. 5  is an exploded perspective view illustrating a casing of the welding helmet including a wireless auto light shield part according to the present invention, and  FIG. 6  is a rear view illustrating a light shield part of the welding helmet including a wireless auto light shield part according to the present invention. 
         [0046]    Referring to  FIG. 4  to  FIG. 6 , the welding helmet further includes a casing  70  configured to receive the light shield part  30  at an inner surface of the space portion  11 , that is, a rear surface of the helmet body  10 . 
         [0047]    The casing  70  is provided at a rear surface of the helmet body  10 . The casing  70  includes a lateral frame  71  located at an outer side of the viewing window  12 , an inner casing  72  coupled with an inner side of the lateral frame  71  and formed therein with a first hollow region  72   a  communicating with the viewing window  12 , including an open rear surface, and fixed to the light shield part  30  and the driving part  40 , and a cover  73  configured to cover the open rear surface of the inner casing  72  and formed therein with a second hollow region  73   a  communicating with the first hollow  72   a.    
         [0048]    The light shield part  30  is provided at an inner side of the casing  70  so that the light shield glass  20  elevates rearward of the viewing window  21  according to drive of the driving part  40 . 
         [0049]    The light shield part  30  includes first and second guide bars  31   a  and  31   b  which are located both sides of a rear surface of the viewing window  21  and including top and bottom ends fixed to upper and lower portions of the inner casing  72 , a guide frame  32  configured to elevatably connect an opposite side of the light shield glass  20  to the second guide bar  31   b , and a drive assembly  33  configured to elevatably connect one side of the light shield glass  20  with the first guide bar  31   a , to connect the driving part  40  with the light shield glass  20 , and to elevate the light shield glass  20  according to drive of the driving part  40 . 
         [0050]    The driving part  40  includes a drive motor  41 , and is fixed to a front surface of the inner casing  72  and receives power from the battery  86 . 
         [0051]    The drive assembly  33  includes a rack  34  configured to elevatably connect one side of the light shield glass  20  to the first guide bar  31   a  and a pinion  35  configured to receive a rotating force from the driving part  40  to elevate the rack  34 . 
         [0052]    The light shield part  30  further includes a reducer  36  configured to connect the pinion  35  to the drive motor  41 . The reducer  36  may include a plurality of gears which are tooth-bonded to each other. 
         [0053]    The drive motor  41  transfers a rotating force in forward and reverse directions. When the drive motor  41  is operated, the pinion  35  is rotated so that the rack  34  elevates in connection with the rack  34 . 
         [0054]    When the rack  34  elevates, the light shield glass  20  elevates together with the guide frame  32  connected to the rack  34  to open or shield the viewing window  12 . 
         [0055]    The welding helmet may include a blowing fan  87  for preventing frost to be formed on the viewing window  12 . 
         [0056]    The blowing fan  87  may prevent frost from being formed on the viewing window  12  by easily circulate air inside the helmet body  10 . As shown in  FIG. 5 , it is preferable that the blowing fan  87  is provided at a front surface of the inner casing  72  and receives power from the battery  86  to be operated. 
         [0057]    Further, a switch  88  for turning-on/off the blowing fan  87  may be provided at the lateral frame  71 . 
         [0058]    As shown in  FIG. 2 , the helmet body  10  is formed therein with an air outlet  89  to exhaust air introduced from the blowing fan  87  to the cover  81   a.    
         [0059]    Accordingly, the blowing fan  87  is operated to introduce internal air of the helmet body  10  and exhaust the introduced internal air through the air outlet  89 , thereby preventing frost to be formed on the viewing window  12 . 
         [0060]    It is preferable that the first wireless communication unit  50  and the first control unit  60  are provided at the helmet body  10 . The first wireless communication unit  50  receives a switching signal according to an on/off operation of the torch switch  21  to provide the switching signal to the first control unit  60 . 
         [0061]    The first control unit  60  receives the switching signal from the first wireless communication unit  50  to control the driving part  40  to elevate the light shield glass  20 , thereby opening or shielding the viewing window  12 . 
         [0062]    The light shield part  30  further includes upper and lower limit sensors  37   a  and  37   b  configured to detect the signal according to opening or shielding of the viewing window  12  so that the first control unit  60  stops drive of the drive motor  41 . The light shield part  30  further includes a guide piece  38  elevating together with the light shield glass  20 , and making contact with the upper and lower limit sensors  37   a  and  37   b  so that the upper and lower limit sensors  37   a  and  37   b  detect an opening or shielding state of the viewing window  12 . 
         [0063]    The upper and lower limit sensors  37   a  and  37   b  are located at upper and lower portions of an opposite side of the light shield glass  20 . The guide piece  38  protrudes outward of the opposite side of the light shield glass  30 . When the light shield glass  30  elevates to a lower limit position or an upper limit position, the guide piece  38  makes contact with the upper limit sensor  37   a  or the lower limit sensor  37   b  so that the upper and lower limit sensors  37   a  and  37   b  detect the opening or shielding state of the viewing window  21 . In other words, the upper and lower limit sensors  37   a  and  37   b  detect whether the light shield glass  30  reaches the lower limit position or the upper limit position. 
         [0064]    The first control unit  60  receives a switching signal from the first wireless communication unit  50  according to on/off of the torch switch  210  to drive the drive motor  41 , and blocks power to be supplied to the drive motor  41  from the battery  86  according to a detection signal of the upper and lower limit sensors  37   a  and  37   b  to stop drive of the drive motor  41 . 
         [0065]    Accordingly, the drive motor  41  stops under control of the first control unit  60  in a state that the light shield glass  20  elevates to the lower limit position or the upper limit position so that the viewing window  12  may maintain the opening or shielding state. 
         [0066]      FIG. 7  is a flowchart illustrating a method of controlling a welding helmet including a wireless auto light shield part according to the present invention. Referring to  FIG. 7 , first, after a worker wears the helmet body  10  adhering to a face of the worker, the torch switch  210  is turned-on (S 610 ). When the torch switch  210  is turned-on, the first wireless communication unit  50  included in the helmet body  10  and the second wireless communication unit  51  included in the welder body  100  receive an ON signal of the torch switch  210  to transfer the ON signal to the first and second control units  60  and  61 , respectively (S 620 ). If the ON signal of the torch switch  210  is input to the first control unit  60 , the light shield glass  20  falls a lower limit position according to drive of the driving part  40  to shield the viewing window  12  (S 630 ). Next, the first control unit  60  stops drive of the driving part  40  according to a detection signal of the lower limit sensor  37   b . Further, if the ON signal of the torch switch  210  is input to the second control unit  61 , the welder body  100  is operated to supply power to a torch  200  so that welding may start (S 640 ). 
         [0067]    In this case, the second control unit  61  drives the welder body  100  when a predetermined time elapses when the ON signal of the torch switch  210  is received. If the torch switch  210  is pushed to be in an on state, the driving part  40  is operated to shield the viewing window  12  by falling the light shield glass  20  so that a control signal is output to the welder body  100  to start the welding in a state that the worker&#39; eye may be protected from direct light omitted upon the welding. 
         [0068]    Next, when the torch switch  210  is turned-off (S 650 ), the first wireless communication unit  50  included in the helmet body  10  and the second wireless communication unit  51  included in the welder body  100  receive an Off signal of the torch switch  210  to transfer the Off signal to the first and second control units  60  and  61 , respectively (S 660 ). If the OFF signal of the torch switch  210  is input to the second control unit  61 , the drive of the welder body  100  stops to block supply of power to the torch  20  so that the welding may not be performed (S 670 ). If the OFF signal of the torch switch  210  is input to the first control unit  60 , the driving part  40  is operated after a predetermined time elapses so that the light shield glass  20  lifts to the upper limit position to open the viewing window  12  (S 680 ). Further, the first control unit  60  stops the drive of the driving part  40  according to a detection signal of the upper limit sensor  37   a.    
         [0069]    In this case, the first control unit  60  drives the driving part  40  when a predetermined time elapses after the OFF signal of the torch switch  210  is received. If the torch switch  210  is turned-off, the drive of the welder body  100  stops to block supply of power to the torch  200  and the light shield glass  20  lifts to open the viewing window  12  so that the worker&#39;s eyes may be protected. 
         [0070]    Although the welding helmet including a wireless auto light shield part and a controlling method thereof according to embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art. 
         [0000]    
       
         
               
             
               
               
               
             
               
               
             
               
               
               
             
               
               
             
               
               
               
             
           
               
                   
               
               
                 * Description of reference numerals* 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                  1: Welding helmet 
                  10: Helmet body 
               
               
                   
                  11: Space portion 
                  12: Viewing window 
               
               
                   
                  20: Light shield glass 
                  30: Light shield part 
               
               
                   
                  31a: First guide bar 
                  31b: Second guide bar 
               
               
                   
                  32: Guide frame 
                  33: Drive assembly 
               
               
                   
                  34: Rack 
                  35: Pinion 
               
               
                   
                  36: Reducer 
                  37a: Upper limit sensor 
               
               
                   
                  37b: Lower limit sensor 
                  38: Guide piece 
               
               
                   
                  31: Guide bar 
                  40: Driving part 
               
             
          
           
               
                   
                  50: First wireless communication unit 
               
               
                   
                  51: Second wireless communication unit 
               
             
          
           
               
                   
                  60: First control unit 
                  61: Second control unit 
               
               
                   
                  70: Casing 
                  80: Lighting part 
               
               
                   
                  81: LED module 
                  84: Power supply 
               
               
                   
                  86: Battery 
                  87: Blowing fan 
               
               
                   
                  90: Wearing portion 
                  91: Wearing frame 
               
               
                   
                  92: Wearing bar 
                  93: Connection bar 
               
               
                   
                  94: Connector 
                  95: Wearing part 
               
             
          
           
               
                   
                  96: First connection member 
               
               
                   
                  97: Second connection member 
               
             
          
           
               
                   
                  98: Flexible bar 
                 100: Welder body 
               
               
                   
                 200: Torch 
                 210: Torch switch