Abstract:
A dual pilot light burner assembly suitable for working with a first type of gas or a second type of gas. According to one implementation the assembly includes a support, a regulating sleeve having a first nozzle, an air and gas mixing and intake chamber, and an injector having a second nozzle. The regulating sleeve is moveable with respect to the injector for placing the first supply nozzle in a first position with respect to the second supply nozzle for the delivery of the first type of gas to the pilot nozzle. The regulating sleeve moveable with respect to the injector for placing the first supply nozzle in a second position with respect to the second supply nozzle for the delivery of the second type of gas to the pilot nozzle. The regulating sleeve including structure accessible by an external tool and capable of receiving an end of the tool for use in moving the regulating sleeve between the first and second positions.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application relates to and claims the benefit and priority to Spanish Patent Application No. P201330885, filed Jun. 14, 2013. 
       TECHNICAL FIELD 
       [0002]    The present invention relates to a dual pilot light burner suitable for dual household appliances which can be supplied with gaseous fuels of several types, particularly natural gas (NG) or liquefied gas (LPG). 
       BACKGROUND 
       [0003]    Household appliances such as stoves including dual pilot light burners are known in the state of the art. 
         [0004]    Pilot light burners are used to control turning on gas burners in a household appliance and for monitoring the flame of the burners. These pilot light burners comprise a gas inlet, a sleeve with a nozzle to provide an outlet for the gas, a chamber in fluid communication with the injector where the air and gas is mixed according to the type of gas used, and a burner head where the combustion of the mixture takes place, the burner head being adjacent to the gas burner in the household appliance. However, users commonly use different types of gas, natural gas (NG) and liquefied gas (LPG) being the most common. The pilot light burner is manufactured based on one type of gas, and if the user has any other type of gas in their home, parts in the pilot light burner must be changed in order to adapt it to the latter type of gas. 
         [0005]    WO2011134725 A2 describes a pilot light burner, suitable for working with gaseous fuels of several types, particularly natural gas (NG) or liquefied gas (LPG), comprising a support, a regulating sleeve comprising a first supply nozzle to supply gas, an air and gas mixing and intake chamber in fluid communication with the regulating sleeve, and an injector operatively cooperating with the regulating sleeve, comprising a second supply nozzle to supply gas, the second nozzle being able to be located with respect to the first nozzle in a first position for supplying a first gas, and a second position for supplying a second gas. 
       SUMMARY OF THE DISCLOSURE 
       [0006]    According to some implementations, a dual pilot light burner suitable for working with gaseous fuels of several types, such as for example, natural gas (NG) or liquefied gas (LPG), is provided that comprises a support, a regulating sleeve comprising a first supply nozzle to supply gas, an air and gas mixing and intake chamber in fluid communication with the regulating sleeve, and an injector operatively cooperating with the regulating sleeve, the injector comprising a second supply nozzle to supply gas, the second nozzle being able to be located with respect to the first nozzle in a first position for supplying a first gas, and a second position for supplying a second gas. In order to adapt the pilot light burner to one of the first and second gases the regulating sleeve is operated with a tool directly from outside pilot light burner to move the regulating sleeve and arranging the second nozzle in the first or second position with respect to the first nozzle. 
         [0007]    The dual pilot light burner allows changing the type of gas without changing any parts and using a simple tool, such as, for example, a screwdriver from outside the burner. Unlike the dual pilot light burners of the state of the art, the pilot light burner does not require any intermediate actuation means incorporated in the pilot light burner assembly, but rather it is the very tool acting directly on the regulating sleeve, causing the movement thereof, and the movement to at least two possible positions regulates one type of gas or the other. An easy-to-operate dual pilot light burner is thus obtained with a minimum number of parts, and both the assembly time of the burner and its final cost are therefore reduced. 
         [0008]    These and other advantages and features will become evident in view of the drawings and the detailed description. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  shows a perspective view of a first embodiment of a dual pilot light burner. 
           [0010]      FIG. 2  is an exploded perspective view of the dual pilot light burner of  FIG. 1 . 
           [0011]      FIG. 3  is an axial section view of the dual pilot light burner of  FIG. 1  regulated for natural gas (NG). 
           [0012]      FIG. 4  is an axial section view of the dual pilot light burner of  FIG. 1  regulated for liquefied gas (LPG). 
           [0013]      FIG. 5  shows a perspective view of a second embodiment of a dual pilot light burner. 
           [0014]      FIG. 6  is an exploded perspective view of the dual pilot light burner of  FIG. 5 . 
           [0015]      FIG. 7  is an axial section view of the dual pilot light burner of  FIG. 5  regulated for natural gas (NG). 
           [0016]      FIG. 8  is an axial section view of the dual pilot light burner of  FIG. 5  regulated for liquefied gas (LPG). 
       
    
    
     DETAILED DESCRIPTION 
       [0017]      FIG. 1  shows a perspective view of a first embodiment of a dual pilot light burner  100 .  FIG. 2  is an exploded perspective view of the dual pilot light burner of  FIG. 1 . 
         [0018]    The dual pilot light burner  100  for a household appliance, such as a stove for example, is suitable for working with gaseous fuels of several types, such as, for example, natural gas (NG) or liquefied gas (LPG). The dual pilot light burner  100  comprises a support  10  with a plurality of housings in which different elements of the burner  100  can be arranged. In the embodiment of the dual pilot light burner shown in  FIGS. 1 , and  2 , there are arranged in the support  10  a regulating sleeve  30 , an injector  50 , a burner head  20 , the burner head  20  comprising a tubular duct  21  that is removably attached to the support  10 , and a pilot light nozzle  22  attached to an end of the tubular duct  21 , a safety thermocouple  91 , and a spark generator  92  such as a spark plug. 
         [0019]      FIG. 3  is an axial section view of the dual pilot light burner of  FIG. 1  regulated for natural gas (NG), and  FIG. 4  is an axial section view of the dual pilot light burner of  FIG. 1  regulated for liquefied gas (LPG). The regulating sleeve  30  comprises a first supply nozzle  31  to supply a first gas at one end, and the support  10  comprises an air and gas mixing and intake chamber  40  which is in fluid communication with the regulating sleeve  30  through the first nozzle  31 . The injector  50  comprises a second nozzle  51  at one end which allows the supply of a second gas. Both parts, the regulating sleeve  30  and the injector  50 , are operatively cooperating such that the nozzles  31  and  51  can be positioned relative to one another. Therefore, the second nozzle  51  can be positioned with respect to the first nozzle  31  in a first position in which the gas flow supplied to the air and gas mixing and intake chamber  40  is defined through the first nozzle  31 , and the second nozzle  51  can also be positioned in a second position in which the gas flow supplied to the air and gas mixing and intake chamber  40  is defined through the second nozzle  51 , the first nozzle  31  having no effect on the gas supply in the second position. Once the gas is taken into the chamber  40 , it is mixed with air coming from the outside through a port  41 , and the mixture is supplied to the burner head  20  which is in fluid communication with the air and gas mixing and intake chamber  40 . The gas and air mixture is supplied to the pilot light nozzle  22  through the tubular duct  21 , and combustion occurs. 
         [0020]    With the configuration defined above, the dual pilot light burner  100  can be used with, for example, natural gas (NG) and with liquefied gas (LPG), natural gas (NG) being supplied through the first nozzle  31  and liquefied gas (LPG) being supplied through the second nozzle  51 . To perform the regulation, the regulating sleeve  30  is movable and the injector  50  is fixed, the regulating sleeve  30  being able to be operated with a tool, such as a screwdriver for example, directly from the outside without the cooperation of intermediate actuation means between the regulating sleeve  30  and the injector  50 . By moving the regulating sleeve  30 , and with it also moving the first nozzle  31 , the second nozzle  51  can be arranged in the first or second position, and natural gas (NG) or liquefied gas (LPG) can therefore be supplied with a simple operation, without changing any part, and with a minimum number of elements. 
         [0021]    In the embodiment of the dual pilot light burner  100  shown in  FIGS. 1-4 , the support  10  is a molded aluminum part with a plurality of housings projecting from the surface of the support  10 , wherein machining operations have been performed to thus allow locating the different elements of the burner  100  mentioned above. The burner head  20  is located in one of the housings, the tubular duct  21  being assembled from the upper portion of the support  10  through a port  14  made in the housing and going through the support  10 . The air and gas mixing and intake chamber  40  is located inside the housing, in the port  14 , which is a through hole. According to some implementations the chamber  40  comprises two air inlet ports  41 , the ports  41  extending through a wall of the housing. 
         [0022]    According to other embodiments, the housing that forms the port  14  is not molded as a single part with the support  10 . In such embodiments the housing may constitute a separate part that is assembled on the support  10 . 
         [0023]    To make a correct air and gas mixture in the air and gas mixing and intake chamber  40  according to if the gas supply is natural gas (NG) or liquefied gas (LPG), the amount of air is different, being lower in the case of natural gas (NG) and greater in the case of liquefied gas (LPG). The dual pilot light burner  100  allows the differentiated air supply into the chamber  40  due to the movement of the regulating sleeve  30 . The air regulation is performed when the regulating sleeve  30  is operated directly with a tool and is moved arranging the second nozzle  51  in the first or second position. As the regulating sleeve  30  is moved, the body of the regulating sleeve  30  interferes with the ports  41  of the chamber  40 , defining a passage  42  in the port  41  which is lower in the first position corresponding to natural gas (NG) than in the second position corresponding to liquefied gas (LPG). Therefore, and while at the same time as setting the dual pilot light burner  100  to natural gas (NG) or to liquefied gas (LPG) with the movement of the regulating sleeve  30 , the primary air needed in the air and gas mixing and intake chamber  40  is regulated. 
         [0024]    The manner in which the regulating sleeve  30  and the injector  50  are placed and arranged to operatively cooperate in the embodiment illustrated in  FIGS. 1-4  is described below. The injector  50  is a part with a central body, the outer surface of may be substantially polyhedral and the inside of which may be substantially cylindrical. According to some implementations the injector has a substantially conical-shaped end  52  projecting from an upper end of the central body, and in the outlet vertex  53  of which the second nozzle  51  is arranged. There is formed inside the injector  50  an inner duct  55  allowing fluid communication between a lower end of the injector  50  where the external gas G inlet is formed and the second nozzle  51 . To assemble the injector  50  in the support  10 , the injector  50  has a lower threaded area, and the port  14  also has a threaded area in its lower area, these threaded areas defining attachment means  70  between the injector  50  and the support  10  when they are attached to one another. 
         [0025]    The regulating sleeve  30  may be a substantially cylindrical part comprising an inner duct  32 . The inner duct  32  in turn comprises a lower chamber  35  and an upper chamber  33 , the upper chamber  33 , according to some implementations being substantially conical-shaped. The upper chamber  33  is in fluid communication with the air and gas mixing and intake chamber  40  when the regulating sleeve  30  is assembled in the pilot light burner  100 . The first nozzle  31  of the regulating sleeve  30  is arranged at an upper end  36  of the regulating sleeve  30 , in an outlet vertex  34  of the upper chamber  33 . 
         [0026]    The support  10  comprises at its through port  14  a certain diameter in the upper inlet area of the support  10 , and in the air and gas mixing and intake chamber  40  the port  14  increases in diameter, a horizontal internal wall which is a stop  11  being formed. The regulating sleeve  30  comprises a threaded area in the lower portion of the lower chamber  35 , in the wall thereof, and the injector  50  has at its end  52  and above the lower threaded area for attachment with the support  10 , an upper threaded area, these threaded areas defining attachment means  60  when they are attached to one another. The regulating sleeve  30  is arranged on the injector  50 , the threaded area of the lower chamber  35  of the regulating sleeve  30  is attached to the upper threaded area of the injector  50 , and the regulating sleeve  30  and the injector  50  are thus attached to one another. 
         [0027]    Once the regulating sleeve  30  is assembled in the injector  50 , the assembly is located in the housing of the support  10  where the burner head  20  is located. The regulating sleeve  30  and injector  50  assembly is assembled in a fixed manner in the housing from the lower portion of the support  10  and through the through port  14  from the larger diameter. The injector  50 , with the regulating sleeve  30  incorporated therein, is located inside the housing of the support  10 , the lower threaded area of the injector  50  is attached to the threaded area of the through hole  14  forming the attachment means  70 , the injector  50  being able to move in the support  10  until the injector  50  is located on a stop  12  of the support  10 . The injector  50  is thus permanently fixed in the support  10 . 
         [0028]    The regulating sleeve  30 , which is attached to the injector  50  by attachment means  60 , can move in the axial direction of the port  14  of the support  10  in both directions, and therefore both the regulating sleeve  30  and the injector  50  are operatively cooperating. The movement in both directions has stops, such that when one of the natural gas (NG) or liquefied gas (LPG) is to be regulated, the regulating sleeve  30  is operated with the tool turning which is capable of turning the regulating sleeve  30  in both directions. By turning the regulating sleeve  30  in the direction of opening with respect to the injector  50 , as the injector  50  is fixed in the support  10 , the regulating sleeve  30  moves in the threaded attachment  60  until the upper end  36  of the regulating sleeve  30  contacts the stop  11  of the support  10 . By turning the regulating sleeve  30  in the direction of closing with respect to the injector  50 , the regulating sleeve  30  moves in the threaded attachment  60  until the inner surface of the upper chamber  33  of the regulating sleeve  30  contacts the outer surface of the outlet vertex  53  of the end  52  of the injector  50 . The outlet vertex  53  and the upper chamber  33  may be substantially conical-shaped surfaces, but in this embodiment the conical-shaped surfaces have a different trailing angle, so contact between both surfaces occurs in a contact area  80  in a portion of each of the surfaces along the entire periphery thereof. 
         [0029]    The regulating sleeve  30  can thus move inside the support  10  in a path located between the stop  11  with the support  10  in the upper area, and the contact area  80  with the injector  50  in the lower area. The stop  11  and the contact area  80  are positions corresponding to the first position and to the second position of the second nozzle  51 . The dual pilot light burner  100  can thus be regulated for natural gas (NG) or liquefied gas (LPG) in a simple manner by simply moving the regulating sleeve  30  directly with a tool against a contact area  80  and against a stop  11 , respectively. With this configuration of the dual pilot light burner  100 , the regulating sleeve  30  and the injector  50  are arranged coaxially with respect to one another, and in turn the assembly formed by both is arranged coaxially with respect to the port  14  of the support  10 . 
         [0030]      FIGS. 5-8  show a second embodiment of the dual pilot light burner.  FIG. 5  shows a perspective view of a second embodiment of a dual pilot light burner.  FIG. 6  is an exploded perspective view of the dual pilot light burner of  FIG. 5 .  FIG. 7  is an axial section view of the dual pilot light burner of  FIG. 5  regulated for natural gas (NG), and  FIG. 8  is an axial section view of the dual pilot light burner of  FIG. 5  regulated for liquefied gas (LPG). The features of the dual pilot light burner of this second embodiment, are similar to those of the dual pilot light burner of the first embodiment with differences that are described below. 
         [0031]    The second nozzle  51  can be positioned with respect to the first nozzle  31  in a first position, in which the gas flow supplied to the air and gas mixing and intake chamber  40  is defined through the first nozzle  31 , and the second nozzle  51  can also be positioned in a second position, in which the gas flow supplied to the air and gas mixing and intake chamber  40  is defined also through the first nozzle  31 , the second nozzle  51  having no effect on the gas supply in the second position. 
         [0032]    As shown in  FIGS. 6 ,  7  and  8 , the injector  50  is a part with a central body, the outer surface of which may be substantially polyhedral and the inside of which may be substantially cylindrical. The injector  50  has an end  52  projecting from the upper end of the central body which may be substantially cylindrical-shaped. In an outlet vertex  53  of the injector  50  there is arranged the second nozzle  51 . The regulating sleeve  30  may be a substantially cylindrical part comprising an inner duct  32 . The inner duct  32  in turn comprises, in its upper area near to the air and gas mixing and intake chamber  40 , an upper chamber  33 , the upper chamber  33  being, according to some implementations being substantially cylindrical-shaped. The regulating sleeve  30  comprises a threaded area in its lower portion, in a wall thereof, and the injector  50  has at its end  52 , and above the lower threaded area for attachment with the support  10 , an upper threaded area, these threaded areas defining attachment means  60  when they are threaded together. 
         [0033]    When the natural gas (NG) or liquefied gas (LPG) dual pilot light burner  100  is to be regulated, the regulating sleeve  30  is operated with the tool that is capable of turning the regulating sleeve in both directions. By turning the regulating sleeve  30  in the direction of opening with respect to the injector  50 , as the injector  50  is fixed in the support  10 , the regulating sleeve  30  moves in the threaded attachment  60  until the upper end  36  of the regulating sleeve  30  contacts the stop  11  of the support  10 . By turning the regulating sleeve  30  in the direction of closing with respect to the injector  50 , the regulating sleeve  30  moves in the threaded attachment  60  until the inner surface of the upper chamber  33  of the regulating sleeve  30  contacts the outer surface of the outlet vertex  53  of the end  52  of the injector  50 . The outlet vertex  53  and the upper chamber  33  may be substantially flat-shaped surfaces, but in this embodiment the conical-shaped surfaces have a different trailing angle, so contact between both surfaces occurs in a portion of each of the surfaces, that is the contact area  80 . 
         [0034]    In the first embodiment of the dual pilot light burner  100 , as shown in  FIGS. 3 and 4 , the first nozzle  31  comprises a gas supply hole  38 , and the second nozzle  51  comprises an injection hole  56 . The injector  50  comprises at its end  52  one or more holes  54 . When the regulating sleeve  30  is positioned as shown in  FIG. 3  for the delivery of natural gas (NG), the holes  54  communicate the inner duct  55  of the injector  50  with the duct  43  defined between the first nozzle  31  and the injector  50 . When the regulating sleeve  30  is assembled in the injector  50 , the end  52  of the injector  50  is housed in the inner duct  32  of the regulating sleeve  30 , forming a gap  81  between the outer surface of the end  52  and the inner surface of the inner duct  32 . When the regulating sleeve  30  contacts the injector  50  in the contact area  80 , the holes  54  are located before the contact area  80  in the direction of the gas flow. 
         [0035]    When the dual pilot light burner  100  is set to natural gas (NG), and therefore the second nozzle  51  is located in the first position, the gas G introduced through the lower end of the injector  50  flows through the inner duct  55  and exits through both the injection hole  56  and through the holes  54  of the injector  50 . These gas flows are capable of finally exiting together through gas supply hole  38  of the first nozzle  31  of the regulating sleeve  30 , since the diameter of the gas supply hole  38  is greater than the diameter of the injection hole  56  of the second nozzle  51 . The gas flow towards the air and gas mixing and intake chamber  40  is therefore defined, in this first position of the second nozzle  51  corresponding to natural gas (NG), by the gas supply hole  38 . 
         [0036]    When the dual pilot light burner  100  is set to liquefied gas (LPG), and therefore the second nozzle  51  is located in the second position, the regulating sleeve  30  contacts the injector  50  in the contact area  80 . In this situation, the gas introduced through the lower end of the injector  50  and flowing through the inner duct  55 , can only exit through the injection hole  56  of the second nozzle  51 , since the holes  54  are located below the contact area  80  in the direction of the gas flow. As explained above, duct  43  is defined between the first nozzle  31  and the injector  50 , specifically a path is defined, through which the gas flows, linking the injection hole  56  and the gas supply hole  38 . Since the diameter of the injection hole  56  is smaller than the diameter of the gas supply hole  38 , the gas flow exits through the gas supply hole  38  of the first nozzle  31  towards the air and gas mixing and intake chamber  40 , the gas flow in this second position of the second nozzle  51  therefore being defined by the injection hole  56 . 
         [0037]    In the second embodiment of the dual pilot light burner  100 , as shown in  FIGS. 7 and 8 , the first nozzle  31  comprises the gas supply hole  38 , and at least a second gas supply hole  39 , and the second nozzle  51  comprises the injection hole  56 . The first gas flow corresponding to natural gas (NG), supplied to the air and gas mixing and intake chamber  40 , is defined by the amount of gas flow passing through the gas supply hole  38  and the second gas supply hole  39  of the first nozzle  31 , corresponding to the first position of the second nozzle  51 , as shown in  FIG. 7 . The injection hole  56  has a sufficient diameter to give way to natural gas flow (NG), the gas supply hole  38  and the second gas supply hole  39  being which define the natural gas flow (NG). 
         [0038]    The second gas flow corresponding to liquefied gas (LPG), supplied to the air and gas mixing and intake chamber  40 , is defined by the duct  43 , defined in this second embodiment by the path that links the gas supply hole  38  of the first nozzle  31 , and the injection hole  56  of the second nozzle  51 , corresponding to the second position of the second nozzle  51 , as shown in  FIG. 8 , the regulating sleeve  30  being displaced until it makes contact with the injector  50  at contact area  80 . The diameter of the gas supply hole  38  is smaller than the diameter of the injection hole  56 , the gas supply hole  38  defining the liquefied gas flow (LPG). 
         [0039]    According to some implementations of the first and second embodiments, the burner head  20  is assembled once the injector  50  and the regulating sleeve  30  are assembled in the support  10 . To that end, the tubular duct  21  is first introduced in the port  14  of the support  10 , and the pilot light nozzle  22  is then assembled at the end of the tubular duct  21 . 
         [0040]    In the first embodiment of the dual pilot light burner  100 , as shown in  FIGS. 1 and 2 , to enable fixing the tubular duct  21  to the support  10 , the support  10  comprises an additional port  13  in a housing adjacent to the housing where the regulating sleeve  30 , the injector  50 , and the tubular duct  21  are located. This additional port  13  is substantially horizontal and communicates the outside with the port  14  of the support  10 , both ports  13  and  14  being substantially perpendicular with respect to one another. Fixing means  90 , a clamping screw for example, is housed in the additional port  13  such that it allows fixing the tubular duct  21  when it is housed in the port  14 . To establish the position of the tubular duct  21  in the port  14 , the tubular duct  21  comprises along the periphery thereof a planar area  93  with a notch  94  therein, and the port  14  has the same shape as the tubular duct  21  along the periphery thereof. The tubular duct  21  is thus positioned in the port  14  of the support  10 , and the fixing means  90  clamp the tubular duct  21  with the end thereof in the notch  94  of the planar area  93  of the tubular duct  21 . 
         [0041]    In the second embodiment of the dual pilot light burner  100 , as shown in  FIGS. 5-8 , to enable fixing the tubular duct  21  to the support  10 , the tubular duct  21  of the burner head  20  has a cylindrical shape and comprises a first protrusion  23  that fits in the outer surface of one end  15  of the port  14  of the support  10 . The tubular duct  21  also comprises a second protrusion  24  which fits in an internal protrusion  16  of the port  14 , the internal protrusion  16  being located between the air and gas mixing and intake chamber  40  and the end  15  of the port  14 . Close to a lower end  17  of the tubular duct  21 , is a peripheral groove  18 , the lower end  17  being located, when the tubular duct  21  is fixed to the support  10 , between the air and gas mixing and intake chamber  40  and the second protrusion  24  of the tubular duct  21 . A washer  19  is arranged in the groove  18 , which is for example a metal C-shaped washer with a circular section. When the tubular duct  21  is assembled to the support  10 , the washer  19  is compressed, and the lower end  17  of the tubular duct  21  can pass through the second protrusion  24 . And when the tubular duct  21  is disassembled from the support  10  with a small pull, the washer  19  is compressed, and allows the passage of the lower end  17 , and thus the tubular duct  21 . Thus, it can secure the tubular duct  21  to the support  10 , by fitting the washer  19  in the bottom of the second protrusion  24 . 
         [0042]    When the injector  50  together with the regulating sleeve  30  and the burner head  20  are fixed in the support  10 , the air and gas mixing and intake chamber  40  is formed in the gap comprised between the tubular duct  21  and the regulating sleeve  30 , the primary air inlet ports  41  being arranged in the air and gas mixing and intake chamber  40 . 
         [0043]    To enable correctly operating the regulating sleeve  30  with the tool from the outside in setting the dual pilot light burner  100  to natural gas (NG) or to liquefied gas (LPG), the regulating sleeve  30  comprises an indentation  37  on the outer surface of its upper end  36  which allows coupling the tool thereto. 
         [0044]    In the first embodiment of the dual pilot light burner  100  shown in  FIGS. 1-4 , the indentation  37  is a groove arranged at the outer surface of the end  36 . The groove allows coupling the end of a tool, such as, for example, a flat-head screwdriver. The gas supply hole  38  of the first nozzle  31  of the regulating sleeve  30 , that is located on the upper end  36  in the outlet vertex  34  of the upper chamber  33 , has the outlet in the indentation  37 . 
         [0045]    In the second embodiment of the dual pilot light burner  100  shown in  FIGS. 5-8 , the indentation  37  is also a groove arranged on the outer surface of the end  36 , the gas supply hole  30  having the outlet near the indentation  37 . 
         [0046]    However, other indentations at the end  36  of the regulating sleeve  30  are possible, such as a radial or star-shaped indentation, for example. 
         [0047]    Once the dual pilot light burner  100  is assembled, when it is to be set to natural gas (NG) or to liquefied gas (LPG), in the first embodiment of the dual pilot light burner  100 , the fixing means  90  is released, and the burner head  20  is removed, and in the second embodiment of the dual pilot light burner  100  the tubular duct  21  is pulled to remove the burner head  20 . Then, the inside of the housing of the support  10  is accessed through the port  14  with the end of the tool. The end of the tool is coupled to the indentation  37  of the regulating sleeve  30  and it is turned in either direction either until the upper end  36  of the regulating sleeve  30  contacts the stop  11  of the support  10  in the case of setting to natural gas (NG), or until the inner surface of the upper chamber  33  of the regulating sleeve  30  contacts the outer surface of the outlet vertex  53  of the end  52  of the injector  50  at the contact area  80 , in the case of setting to liquefied gas (LPG). The pilot light nozzle  22  can be a single-pilot or multi-pilot light nozzle corresponding to the number of burners served by the dual pilot light burner  100 . In the case of a single pilot light, the pilot light nozzle  22  can have a port that is axial with respect to the tubular duct  21  (not depicted in the drawings), such that the burner head  20  would not have to be removed to set the pilot assembly to the different types of gas. In this case, the regulating sleeve  30  would be accessed with the tool directly through the tubular duct  21 .