Abstract:
[Problem] To provide a torch adjustment apparatus that improves anti-heat measures while making it easy to set the angle of the torch. [Solution] Provided is a torch adjustment apparatus for adjusting the position of a torch in relation to the material to be processed. The apparatus has the following: a torch holder ( 27 ) that supports the torch so that the torch is detachable; a torch angle adjustment unit that adjusts the angle of the torch holder in relation to the material to be processed; and a torch in and out adjustment unit that adjusts the in and out position of the torch holder by moving the holder on a plane parallel to the material to be processed in a direction perpendicular to the traveling direction of the carriage (B). The torch holder is formed in a channel shape comprising a pair of flanges ( 27   a  and  27   b ) and a connecting piece ( 27   c ) that connects the pair of flanges. A mounting member ( 28 ) for mounting the torch so that the torch is detachable is disposed on the connecting piece, and the torch holder is mounted to the torch angle adjustment unit via one of the flanges ( 27   a ).

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a torch adjustment apparatus for adjusting in relation to a material to be processed a position and an angle of a welding torch or a cutting torch mounted on a carriage that travels on top of the material to be processed. 
       BACKGROUND ART 
       [0002]    In a case of fillet-welding an intersection of two large-sized steel plates arranged perpendicularly, a carriage that mounts a welding torch, can travel on the steel plate arranged horizontally, and guides a surface of the steel plate arranged vertically is used (for example, refer to Patent Literature 1). Also, in a case of cutting a steel plate or a stainless steel plate, a carriage that mounts a gas cutting torch or a plasma cutting torch and travels on the steel plate or the stainless steel plate is used in some cases. 
         [0003]    In a case of welding or cutting with use of the carriage mounted and traveling on a material to be processed, strong heat is applied from the torch to a part to be processed to fuse or burn the part to be processed in the steel plate. As a result, since the carriage is heated as well, by radiation of the applied heat, a heat-insulating plate is provided over an approximately entire surface of the carriage on a side on which the torch is arranged. 
         [0004]    Also, in a case of the fillet welding, a position in a horizontal direction, a position in a height direction, and an angle of the welding torch need to be adjusted so that the welding torch may head for the intersection of the steel plates accurately. Similarly, in a case of cutting the steel plate, a position in a horizontal direction, a position in a height direction, and an angle corresponding to an angle of targeted cutting (for example, an angle corresponding to vertical cutting or groove cutting of the steel plate) of the cutting torch need to be adjusted. 
         [0005]    To this end, a normal carriage including the carriage described in Patent Literature 1 is provided with a torch adjustment apparatus for adjusting the position and the angle of the welding torch or the cutting torch. The torch adjustment apparatus is configured to include an in and out adjustment member including a screw shaft or a rack provided on a plane parallel to the material to be processed in a direction perpendicular to a traveling direction of the carriage, an elevation member including a screw shaft or a rack whose in and out movement is adjusted by this in and out adjustment member and that is provided approximately in a vertical direction to the material to be processed, and a torch holder mounted turnably to this elevation member. 
         [0006]    The torch such as the welding torch or the cutting torch is mounted to the torch holder, and by respectively operating the in and out adjustment member and the elevation member, in and out movement of the torch and a height of the torch from the material to be processed are adjusted, and by setting a mounting angle of the torch holder in relation to the elevation member, the angle of the torch is adjusted. 
       CITATION LIST 
     Patent Literature 
       [0000]    
       
         Patent Literature 1: JP 3400290 B1 
       
     
       SUMMARY OF INVENTION 
     Technical Problem 
       [0008]    The above carriage mounting the welding torch or the cutting torch is provided with the heat-insulating plate for insulating radiation heat at the time of processing the material to be processed, and it is required to take more effective anti-heat measures. 
         [0009]    Also, there is an actual demand for an adjustment apparatus making it easy to set the angle of the torch in relation to the material to be processed. 
         [0010]    An object of the present invention is to provide a torch adjustment apparatus that improves anti-heat measures while making it easy to set an angle of a torch. 
       Solutions to Problem 
       [0011]    To solve the above problems, a torch adjustment apparatus according to the present invention is one for adjusting a position of a torch in relation to a material to be processed, the torch including a welding torch or a cutting torch mounted on a carriage that travels on top of the material to be processed, and includes a torch holder that supports the torch so that the torch may be detachable, a torch angle adjustment unit that adjusts an angle of the torch holder in relation to the material to be processed, and a torch in and out adjustment unit that adjusts an in and out position of the torch holder by moving the holder on a plane parallel to the material to be processed in a direction perpendicular to a traveling direction of the carriage, wherein the torch holder is formed in a channel shape including a pair of flanges and a connecting piece that connects the pair of flanges, a mounting member for mounting the torch so that the torch may be detachable is disposed on the connecting piece, and the torch holder is mounted to the torch angle adjustment unit via one of the flanges. 
         [0012]    In the torch adjustment apparatus, the torch in and out adjustment unit is preferably configured to include a shaft member arranged on the plane parallel to the material to be processed in the direction perpendicular to the traveling direction of the carriage and a bracket driven by the shaft member to be configured to enable reciprocating movement and provided at a predetermined position with a turning shaft, the torch angle adjustment unit is preferably configured to include a turning member turnably mounted to the turning shaft provided in the bracket and provided at a position away from the turning shaft with a nut member and a screw member arranged turnably in the bracket approximately in a vertical direction to the material to be processed and screwed in the nut member provided in the turning member, and the torch holder is preferably mounted to the turning member via one of the flanges. 
       Advantageous Effects of Invention 
       [0013]    In the torch adjustment apparatus according to the present invention, since the torch holder is formed in a channel shape including the pair of flanges and the connecting piece, and the mounting member for mounting the torch is disposed on the connecting piece, the torch is surrounded in three directions by the pair of flanges and the connecting piece. Thus, part of heat generated from a welded portion or a cut portion can be insulated by the torch holder. Accordingly, it is possible to prevent part of the heat from transmitting to the carriage, which can improve anti-heat measures. 
         [0014]    Also, the torch angle adjustment unit is configured to include the turning member turnably mounted to the turning shaft provided in the bracket and provided at the position away from the turning shaft with the nut member and the screw member arranged turnably in the bracket approximately in the vertical direction to the material to be processed and screwed in the nut member provided in the turning member. The torch holder is mounted to the turning member via one of the flanges. Thus, by rotating the screw member arranged in the bracket, the turning member can be turned, centering on the turning shaft. The torch holder turns along with turning of the turning member, and the torch mounted to the mounting member provided on the torch holder also turns. Accordingly, an angle of the torch in relation to the material to be processed can be adjusted easily. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0015]      FIGS. 1(   a ) and  1 ( b ) are a front view and a left side view illustrating configurations of a carriage and a torch adjustment apparatus. 
           [0016]      FIGS. 2(   a ) and  2 ( b ) are the front view and a right side view illustrating configurations of the carriage and the torch adjustment apparatus. 
           [0017]      FIGS. 3(   a ) and  3 ( b ) are the front view and a plan view illustrating configurations of the carriage and the torch adjustment apparatus. 
           [0018]      FIG. 4  illustrates a configuration of a main part of a torch holder. 
           [0019]      FIGS. 5(   a ) and  5 ( b ) illustrate states when a torch is raised and lowered by the torch adjustment apparatus. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0020]    Hereinafter, a configuration of a torch adjustment apparatus A according to an embodiment of the present invention and a configuration of a carriage B having the torch adjustment apparatus A will be described with reference to the drawings. In the present embodiment, the carriage B is configured as a carriage for welding adapted to weld two not-illustrated steel plates. Especially, one of the two steel plates is arranged horizontally while the other is arranged to erect, and the carriage B is configured to enable application of fillet welding to a part in which the two steel plates intersect. Thus, a not-illustrated welding torch is mounted to the torch adjustment apparatus A, and to this welding torch are connected hoses such as a hose that supplies gas and a hose through which a weld line passes. 
         [0021]    However, the torch to be mounted is not limited to the welding torch but may be a cutting torch such as a gas cutting torch and a plasma cutting torch. In a case where such a cutting torch is selected and mounted, mechanisms and members specific to the selected cutting torch such as a valve mechanism adapted to supply gas and a relay member of a cabtyre cable for electric conduction are mounted on predetermined positions of the carriage B. 
         [0022]    First, a configuration of the carriage B will be described briefly. The carriage B illustrated in  FIGS. 1 to 3  is configured to enable to travel in arrows a and b directions (hereinafter, the arrow a direction is referred to as a front direction while the arrow b direction is referred to as a back direction in some cases) and is configured to enable to execute targeted welding by driving the not-illustrated welding torch in the process of this travel. 
         [0023]    The carriage B has a casing  1  covered with a cover  1   a  at an upper portion thereof and closed by a bottom plate at a lower portion thereof, and a not-illustrated driving motor and a control unit controlling the driving motor are incorporated in the casing  1 . 
         [0024]    On both sides in a front-back direction as a traveling direction of the casing  1  are rotatably arranged a plurality of wheels  2 . At least one of the wheels  2  is configured as a driving wheel driven by a driving motor while the other wheels  2  are configured as driven wheels. However, how many wheels  2  act as driving wheels is not limited, and two wheels or four wheels may be configured as driving wheels. 
         [0025]    On an upper surface of the cover  1   a  are provided a socket  3  adapted to connect a power supply cord, a push-button switch  4  adapted to operate movement of the carriage B, a dial  5  adapted to adjust traveling speed of the carriage B, and an LED  6  adapted to display a movement mode of the carriage B. 
         [0026]    On one side surface (a side surface on a side of an arrow c direction; it is hereinafter referred to as a left side surface of the carriage B in some cases while a side surface on a side of an arrow d direction is referred to as a right side surface of the carriage B in some cases) of the casing  1 , arranged are guide rollers  7   a  at both end portions in the front-back direction, respectively. These guide rollers  7   a  are rotatably provided at tip ends of arms  7   b  respectively configured to enable expansion and contraction, and at the time of execution of fillet welding, the guide rollers  7   a  are configured to contact a surface of the steel plate arranged vertically to enable to guide travel of the carriage B. 
         [0027]    In addition, as illustrated in  FIG. 2(   b ), in the casing  1  is arranged a magnet  8   a , which is configured to enable a posture to be changed along with an operation of a handle  8   b . When the magnet  8   a  is inclined as illustrated with a dotted line in the figure by the operation of the handle  8   b , an adsorption force to the steel plate decreases to enable the carriage B to be separated from the steel plate easily. Also, when the magnet  8   a  is parallel to the steel plate by the operation of the handle  8   b , the adsorption force becomes maximum to enable the carriage B to travel along the steel plate in a stable state. 
         [0028]    When the carriage B configured as above is operated by pressing the push-button switch  4  in a state in which the magnet  8   a  is parallel to the steel plate as a material to be processed to increase the adsorption force, the carriage B starts traveling in the arrow a direction or the arrow b direction. By operating the dial  5 , traveling speed of the carriage B can be adjusted. 
         [0029]    Next, a configuration of the torch adjustment apparatus A according to the present embodiment will be described. 
         [0030]    The torch adjustment apparatus A is provided at either end portion (an end portion on a front side in the present embodiment) in the front-back direction of the casing  1  constituting the carriage B and is configured so that the not-illustrated torch may be arranged on the side surface on the side of the arrow c direction approximately at a center of the carriage B. Thus, when the carriage B is seen from the side of the arrow b direction toward the side of the arrow a direction, the handle  8   b  operating the magnet  8   a  is arranged on the side of the right side surface while the torch is arranged on the side of the left side surface as illustrated in  FIG. 3(   a ). 
         [0031]    To an end portion on the front side of the casing  1  is mounted a mounting bracket  20  by screws  21 . This mounting bracket  20  is provided with vertical elongated holes  20   a , and the screws  21  are inserted in the elongated holes  20   a  and are fastened in the casing  1 . Thus, the mounting bracket  20  is configured to enable positional adjustment in an up-down direction against the casing  1 . 
         [0032]    As illustrated in  FIG. 2(   b ), at an upper end portion of the mounting bracket  20  is horizontally provided a screw shaft  22  as a shaft member constituting a torch in and out adjustment unit. When the mounting bracket  20  is mounted to the casing  1  constituting the carriage B, the screw shaft  22  is arranged in parallel with a line connecting centers of the wheels  2 . At an end portion of the screw shaft  22  projecting from the mounting bracket  20  is fixed a handle  22   a , and the screw shaft  22  is configured to enable rotation by an operation of this handle  22   a . Also, in an end portion of the screw shaft  22  arranged in the mounting bracket  20  is screwed a bracket  23 , which is configured to enable to move in the arrow c direction or the arrow d direction in accordance with rotation of the screw shaft  22 . 
         [0033]    It is to be noted that a shaft forming a rack can be used instead of the aforementioned screw shaft  22 . In this case, a pinion is arranged in the bracket  23 . 
         [0034]    The bracket  23  is configured to include a horizontal piece  23   a  and a hanging piece  23   b . The horizontal piece  23   a  is formed in an extending direction of the screw shaft  22  while the hanging piece  23   b  is formed to hang in a perpendicular direction from the horizontal piece  23   a . Dimensions of the horizontal piece  23   a  and the hanging piece  23   b  are not particularly limited and are preferably set arbitrarily in accordance with a specification set as a welding apparatus or a cutting apparatus. 
         [0035]    At a predetermined position of the horizontal piece  23   a  constituting the bracket  23  is provided a supporting portion rotatably supporting a screw member  24  constituting a torch angle adjustment unit. Also, at a predetermined position of the hanging piece  23   b  is horizontally arranged a turning shaft  23   c  turnably supporting a turning member  25  constituting a torch angle adjustment unit. 
         [0036]    The turning member  25  is turnably supported by the turning shaft  23   c  provided in the hanging piece  23   b  of the bracket  23 . Thus, the turning member  25  is configured to enable to turn in a vertical plane, centering on the turning shaft  23   c . Also, the turning member  25  is provided with an elongated hole  25   a  at a position away from the turning shaft  23   c  and corresponding to the screw member  24  provided in the horizontal piece  23   a , and in the elongated hole  25   a  is arranged a nut member  26  screwed with the screw member  24 . The turning member  25  is further provided with a projecting supporting arm  25   b  on a surface corresponding to the back side of the carriage B at a position corresponding to the elongated hole  25   a  of the turning member  25 . 
         [0037]    As described above, the nut member  26  is configured to enable to move along the elongated hole  25   a  along with turning of the turning member  25 . That is, the screw member  24  is arranged to pass through the horizontal piece  23   a  of the bracket  23  approximately in the vertical direction and passes through and screws in the nut member  26  in the vertical direction. When the handle  24   a  is operated to rotate the screw member  24 , the nut member  26  is raised or lowered along with this rotation, and the turning member  25  turns, centering on the turning shaft  23   c . Accordingly, a distance between a center of the nut member  26  and the turning shaft  23   c  changes, and this change can be absorbed by the elongated hole  25   a.    
         [0038]    Meanwhile, in the configuration in the present embodiment, although the nut member  26  moves along the elongated hole  25   a  provided in the turning member  25  along with rotation of the screw member  24 , the present invention is hot limited to this configuration. For example, a configuration in which the nut member  26  is turnably arranged against the turning member  25  while the screw member  24  is configured to enable oscillation against the horizontal piece  23   a  of the bracket  23  can achieve similar operations. 
         [0039]    To the supporting arm  25   b  provided in the turning member  25  is mounted a torch holder  27 . The torch holder  27  functions to support the not-illustrated welding torch or cutting torch (the welding torch in the present embodiment) and insulate radiation of heat generated at the time of welding or cutting to prevent the radiation of heat from transmitting to the carriage. As illustrated in  FIG. 4 , the torch holder  27  is formed in a channel shape including a pair of flanges  27   a  and  27   b  and a connecting piece  27   c  that connects the pair of flanges  27   a  and  27   b.    
         [0040]    A mounting member  28  for mounting the not-illustrated torch so that the torch may be detachable is disposed on a predetermined position of the connecting piece  27   c . This mounting member  28  is configured to include a base portion  28   a , a nipping portion  28   b  configured to be turnable against the base portion  28   a  and nipping the torch together with the base portion  28   a , and a fixing portion  28   c  fixing the nipping portion  28   b  to the base portion  28   a . By mounting the base portion  28   a  to the connecting piece  27   c  of the torch holder  27 , the torch can be mounted so as to be detachable. 
         [0041]    Thus, the connecting piece  27   c  is provided with holes  27   d  and elongated holes  27   e  adapted to fix the base portion  28   a  to be arrayed, and by inserting bolts into the hole  27   d  and the elongated hole  27   e  as a pair to fasten the base portion  28   a , the mounting member  28  can be fixed. Especially, pairs each consisting of the hole  27   d  and the elongated hole  27   e  are formed in two positions at upper and lower portions of the connecting piece  27   c , respectively, and the upper pair or the lower pair can be selected for fixing the mounting member  28  thereto. Accordingly, by selecting the upper or lower pair and fixing the mounting member  28  thereto, the torch can be mounted to approach to or separate from the steel plate. Also, since one is formed as the elongated hole  27   e , a mounting posture can be adjusted at the time of fixing the mounting member  28  to the connecting piece  27   c.    
         [0042]    One flange  27   a  constituting the torch holder  27  is formed perpendicularly to the connecting piece  27   c , and the torch holder  27  is mounted to the supporting arm  25   b  provided in the turning member  25  via the flange  27   a . A structure of mounting the flange  27   a  to the supporting arm  25   b  is not particularly limited, and the flange  27   a  can be mounted to the supporting arm  25   b  with use of a not-illustrated bolt. Also, the supporting arm  25   b  can be formed in a half nut shape while the flange  27   a  can be provided with a shaft member, and the flange  27   a  can be mounted to the supporting arm  25   b  by fitting the shaft member into the half nut. 
         [0043]    In the present embodiment, the torch holder  17  is mounted to the supporting arm  25   b  with use of a not-illustrated bolt. Thus, a hole  27   f  through which the bolt passes is formed at a predetermined position of the flange  27   a . Although the circular hole  27   f  is formed in the flange  27   a  in the example illustrated in  FIG. 4 , a linear elongated hole or an arc-like elongated hole is preferable in some cases, and a shape of the hole  27   f  is not limited to a circle. Also, the hole  27   f  is formed at a position in the flange  27   a  approximately corresponding to a center of the torch to be mounted to the mounting member  28 . 
         [0044]    The torch holder  27  is formed by sheet-metal processing, and one flange  27   a  is formed to be double in a state of being folded outward. Thus, when the flange  27   a  is fastened to the supporting arm  25   b  by inserting the bolt into the hole  27   f  of the flange  27   a , the folded flange  27   a  functions as a spring washer and can prevent the bolt from loosening. 
         [0045]    Also, by mounting the torch holder  27  to the supporting arm  25   b  with use of the bolt, a mounting angle of the torch holder  27  in relation to the supporting arm  25   b  can be adjusted easily. That is, in a case where the torch holder  27  is mounted to the supporting arm  25   b  by one bolt, the angle can be adjusted by loosening the bolt. Also, in a case where the torch holder  27  is mounted to the supporting arm  25   b  with use of a plurality of bolts, the mounting angle of the torch holder  27  in relation to the supporting arm  25   b  can be adjusted by forming the hole  27   f  formed in the flange  27   a  in an arc-like elongated hole shape. 
         [0046]    Further, a mounting position of the torch holder  27  in relation to the supporting arm  25   b  can be adjusted by forming a linear elongated hole in the flange  27   a  and mounting the flange  27   a  to the supporting arm  25   b  with use of the bolt inserted in this elongated hole. In this case, interference of a lower end portion with the steel plate along with turning of the torch holder  27  can be prevented, which is preferable. 
         [0047]    The other flange  27   b  constituting the torch holder  27  is formed in a state of being inclined further outside than a perpendicular to the connecting piece  27   c . Thus, the torch holder  27  is not formed in a channel shape having perpendicular flanges but in a more opened channel shape. In this manner, by inclining the flange  27   b  outside, it is possible to visually recognize a state of the operating torch easily. 
         [0048]    Although height dimensions of the pair of flanges  27   a  and  27   b  constituting the torch holder  27  are not particularly limited, the pair of flanges  27   a  and  27   b  is preferably formed to wrap the torch when the torch is mounted to the mounting member  28 . 
         [0049]    Although a length of the torch holder  27  is not particularly limited, the length is preferably one enabling the lower end portion to approach a surface of the steel plate as much as possible when the torch is set at a predetermined height and at a predetermined angle in relation to the steel plate at the time of performing a targeted work. Setting the length of the torch holder  27  in this manner enables to prevent heat generated at the time of execution of welding to the steel plate from being radiated to the carriage B. However, when the torch holder  27  approaches the steel plate so much that the torch holder  27  contacts the steel plate, this may give a failure to travel of the carriage B. 
         [0050]    Next, a procedure of adjusting a position and an angle of the torch by the torch adjustment apparatus A configured as above will be described with reference to  FIGS. 1(   a ) and  5 . 
         [0051]      FIG. 1(   a ) illustrates a state in which the nut member  26  is located approximately at a center of the elongated hole  25   a  provided in the turning member  25 . In this state, the torch holder  27  is at a predetermined angle such as 45 degrees. Thus, the not-illustrated torch mounted to the mounting member  28  fixed on the torch holder  27  is also at an angle of 45 degrees. 
         [0052]    In a case where the torch is moved in the arrows c and d directions while the angle of the torch is kept, that is, in a case where the carriage B is installed on the steel plate, and where a position of the torch is adjusted in the horizontal direction from a portion to be welded, the handle  22   a  has only to be operated to move the bracket  23  in the arrow c direction to cause the bracket  23  to project from the mounting bracket  20  or to move the bracket  23  in the arrow d direction to cause the bracket  23  to approach the mounting bracket  20 . 
         [0053]    By the above operation of the handle  22   a , the bracket  23 , the turning member  25 , and the torch holder  27  can be moved at the same time in the arrows c and d directions, along with which the torch can be moved in the arrows c and d directions and adjusted to a desired position. 
         [0054]    In a case where the torch is adjusted to increase the angle of the torch in relation to the steel plate (to make the torch erect further against the steel plate) from the state illustrated in  FIG. 1(   a ), this adjustment can be achieved by rotation of the screw member  24 . That is, when the screw member  24  is rotated to the left to a turning limit, for example, the turning member  25  turns in an arrow e direction as illustrated in  FIG. 5(   a ). Along with this turning, the torch holder  27  turns as well, and the lower end portion is lowered until the lower end portion reaches a lower side than a plane including the plurality of wheels  2  while the angle in relation to the steel plate is increased. Accordingly, at the same time as turning and lowering of the torch holder  27 , the torch mounted to the torch holder  27  is turned and lowered, and during this process, adjustment to a desired angle can be performed. 
         [0055]    By turning and lowering the torch holder  27  in the above manner, the angle of the torch mounted to the torch holder  27  in relation to the steel plate can be adjusted to a predetermined angle. In a case where the lower end portion of the torch holder interferes with the steel plate along with this turning, the mounting position of the torch holder  27  in relation to the supporting arm  25   b  needs to be adjusted to prevent interference. 
         [0056]    Also, in a case where the torch is adjusted to decrease the angle of the torch in relation to the steel plate (to lay the torch more against the steel plate) from the state illustrated in  FIG. 1(   a ), when the screw member  24  is rotated to the right to a turning limit, for example, the turning member  25  turns in an arrow f direction as illustrated in  FIG. 5(   b ). Along with this turning, the torch holder  27  turns as well, and the lower end portion is raised further upward than the plane including the plurality of wheels  2  while the angle in relation to the steel plate is decreased. Accordingly, at the same time as turning and raising of the torch holder  27 , the torch mounted to the torch holder  27  is turned and raised. 
         [0057]    By turning and raising the torch holder  27  in the above manner, the angle of the torch mounted to the torch holder  27  in relation to the steel plate can be adjusted to a predetermined angle. In a case where a distance of the torch from the steel plate increases along with turning of the torch holder  27 , a mounting position of the mounting member  28  in relation to the connecting piece  27   c  is changed to a lower end side to enable the torch to be closer to the steel plate. 
       INDUSTRIAL APPLICABILITY 
       [0058]    The torch adjustment apparatus according to the present invention is advantageous to use not only for the carriage for welding but for a carriage for cutting. 
       REFERENCE SIGNS LIST 
       [0000]    
       
         
           
             A torch adjustment apparatus 
             B carriage 
               1  casing 
               1   a  cover 
               2  wheel 
               3  socket 
               4  push-button switch 
               5  dial 
               6  LED 
               7   a  guide roller 
               7   b  arm 
               8   a  magnet 
               8   b  handle 
               20  mounting bracket 
               20   a  elongated hole 
               21  screw 
               22  screw shaft 
               22   a  handle 
               23  bracket 
               23   a  horizontal piece 
               23   b  hanging piece 
               23   c  turning shaft 
               24  screw member 
               24   a  handle 
               25  turning member 
               25   a  elongated hole 
               25   b  supporting arm 
               26  nut member 
               27  torch holder 
               27   a ,  27   b  flange 
               27   c  connecting piece 
               27   d ,  27   f  hole 
               27   e  elongated hole 
               28  mounting member 
               28   a  base portion 
               28   b  nipping portion 
               28   c  fixing portion