GAS BURNER

FIELD OF THE TECHNIQUE

The present invention relates to a gas burner for caravans, boats and vehicles in general, ie a gas burner to be mounted on a cooking hob intended to be used and mounted on board of a vehicle of any type.

STATE OF THE ART

The gas burners which are intended to be mounted on the hobs present inside a caravan, boat or vehicle in general must be equipped with a system for fixing the lid and the flame spreader to the injector holder, or to the hob, able to avoid that the inevitable jolts, which are generated inside the vehicle during its journeys, cause unwanted and continuous vibrations or noises, up to the detachment of the lid and the flame spreader from the injector holder or from the hob.

Furthermore, in this context, the lid is generally locked to the flame spreader by means of two through screws which are inserted from top to bottom and which, after passing through both the lid and the flame spreader, are screwed into two corresponding bushings, also used to fix the injector holder to the hob.

This solution is not satisfactory since the screws for fixing the lid to the flame spreader remain visible and give rise to an unpleasant aesthetic result.

To eliminate this drawback, it has already been proposed to fasten a sheet metal plate to the flame spreader by means of two fixing screws, which act substantially in the same way as described in the previous solution, as well as to obtain, in the center of the sheet metal plate, a threaded through hole, into which a threaded pin welded to the center of the lower face of the enamelled lid is screwed.

This solution allows to obtain a satisfactory aesthetic result since, once the burner is assembled, what remains visible is only the enamelled lid, which thus completely hides both the plate and the heads of the screws fixing the sheet metal plate to the flame spreader.

However, this known solution is rather expensive to implement as it requires an additional component (the sheet metal plate) and requires additional operations to constrain this additional component to the flame spreader and to weld the threaded pin to the lower surface of the enamelled lid.

Furthermore, the known solutions present a problem of use linked to their maintenance and cleaning. Occasionally, in fact, the end user will need to clean the burner which will inevitably get dirty with use and to do this he will have to remove the screws that keep the various components locked together. This operation may not be so easy as with time, dirt and oxidation these screws tend to rub together making this disassembly operation very difficult and also risking damaging the threads of the screws or bushings, thus irreparably compromising the fixing system.

There are also known solutions that do not require the use of screws, such as the one described in EP3426979, where the fixing takes place by means of springs fixed on the injector holder which are hooked onto special shaped pins which cross the flame spreader and which are welded on the lower part of the lid. This last solution does not have a negative impact on the aesthetics of the product as it does not have visible fixing screws on the upper surface of the enamelled lid, however this solution, like the two previous ones, is not optimal as, having parts that slide between them, the disassembly and subsequent reassembly of the various components over time could be complicated due to wear and dirt.

OBJECTS OF THE INVENTION

The object of the invention is to propose a gas burner to be installed on the cooking surface of caravans, boats and vehicles in general, which overcomes, at least in part, the drawbacks of traditional solutions.

Another object of the invention is to propose a gas burner which can be assembled and disassembled extremely easily, quickly and safely.

Another object of the invention is to propose a gas burner which, over time and with the inevitable accumulation of dirt following use, can be assembled and disassembled in an extremely easy, quick and safe way.

Another object of the invention is to propose a gas burner which has a particularly pleasant overall aesthetic effect.

Another object of the invention is to propose a gas burner which has a reduced number of components.

Another object of the invention is to propose a gas burner which can be obtained with extremely low production costs.

Another object of the invention is to propose a gas burner which can be mass-produced and quickly and efficiently.

Another object of the invention is to propose a gas burner which has an alternative and/or improved characterization, both in constructive and functional terms, with respect to the traditional ones.

Another object of the invention is to propose a gas burner which is of high standards, both functional and aesthetic, and at the same time of affordable cost, thus allowing the possibility of its diffusion on a large scale.

Another object of the invention is to propose a gas burner of simple construction and low cost.

SUMMARY OF THE INVENTION

All these purposes, either alone or in any combination thereof, and others which will result from the following description, are achieved, according to the invention, with a gas burner having the characteristics of claim 1.

The present invention relates to a gas burner for caravans, boats and vehicles in general comprising:

- an injector holder to be applied in correspondence with an opening intended to be made in a hob of a caravan, boat and/or vehicle in general, said injector holder being provided of at least one injector which is connected to at least one gas inlet,
- a flame spreader which is positioned above said injector holder and comprising at least one duct in fluid communication with said injector and with at least one distribution chamber of the fuel mixture, for the generation of at least one crown of flames,
- a lid, resting on said flame spreader and delimiting the top said at least one distribution chamber for the fuel mixture,
  
  and in which said burner comprises:
- locking means for preventing or limiting movement, at least lateral, between the flame spreader and the lid,
- means for magnetically connecting the injector holder with the flame spreader and/or the lid.

Preferably, the flame spreader comprises a vertical duct which faces below said injector and which opens upwards into the distribution chamber which is defined below and laterally by said flame spreader.

Preferably, said locking means are configured to join together the flame spreader and the lid so as to thus define an assembly to be applied/removed on/from the injector holder with a single movement. Preferably, said locking means are configured to lock both the lateral movement between the flame spreader and the lid, and their movement along the supporting/overlapping direction of the lid on the flame spreader. Advantageously, in this way, the flame spreader and the lid define a single unit/assembly which is faster and easier to remove.

Advantageously, in a possible embodiment, the locking means between the lid and the flame spreader comprise fastening members which also support and/or define the means for magnetic connection of the lid and/or flame spreader to the injector holder.

Advantageously, in a possible embodiment, the locking means between the lid and flame spreader are independent and distinct from the means for magnetic connection of the lid and/or flame spreader to the injector holder.

Advantageously, the magnetic connection means comprise at least a first element mounted or integrated on the injector holder and at least a corresponding second element which is mounted, or integrated, on the flame spreader or on the lid, and which interacts magnetically with said at least one first element.

Preferably, said at least one first element can be mounted/integrated on the injector holder and said at least one second element can be mounted/integrated on the flame spreader or on the lid so that, when the flame spreader with the lid is positioned on the injector holder, said at least one second element faces, and preferably is substantially aligned, with a corresponding first element.

Preferably, said at least one first element is made at least partly of magnetized material, preferably it is a magnet, while said at least one second element is made at least partly of ferromagnetic material.

Preferably, said at least one first element is made at least in part in magnetized material, preferably it is a magnet, and said at least one second element is made at least in part in magnetized material, preferably it is a magnet, and in which said at least one first element and said at least one second element are arranged—and in particular they are mounted respectively on the injector holder and on the flame spreader or on the lid—so that they face each other with poles of opposite sign which, therefore, attract each other.

Preferably, when the flame spreader rests on the injector holder, said at least one first element and said at least one second element are in direct contact. Preferably, the flame spreader rests on the injector holder only in correspondence with the areas in which the second elements come into direct contact with said first elements.

Preferably, when the flame spreader rests on the injector holder, said at least one first element and said at least one second element are not in direct contact, thus being slightly spaced.

Preferably, the flame spreader rests on the injector holder in correspondence with the areas in which the second elements come into direct contact with said first elements and also the body of the flame spreader rests on the body of the injector holder.

Advantageously, the magnetic connection means comprise two or more first elements mounted or integrated on the injector holder and two or more second elements which are mounted, or integrated, on the flame spreader or on the lid, and in which each second element magnetically interacts with a corresponding first element.

Advantageously, the magnetic connection means comprise at least two second elements which are mounted and/or integrated in the assembly, which is defined by the flame spreader and the lid, preferably in diametrically opposite positions, and at least two corresponding first elements mounted and/or integrated in the injector holder, or vice versa, positioned so that when the flame spreader is resting on the injector holder, each of said at least two first elements faces and is substantially axially aligned with a respective second element.

Advantageously, the locking means between the lid and the flame spreader comprise at least one fastening member which is associated with the lid and which fits into at least one opening formed in the flame spreader. Preferably, said at least one fastening member passes through a corresponding opening which is through and which is formed in the flame spreader so as to protrude from the bottom of the flame spreader itself. Preferably, said at least one fastening member engages, for example by interlocking or screwing, within a corresponding opening which is blind and which is formed in the flame spreader.

Conveniently, said at least one fastening member can comprise a pin which is welded or screwed to the lower face of the lid. Conveniently, said at least one fastening member can be made in a single body with the lid, for example by sintering.

Conveniently, said at least one fastening member can comprise a screw, a bolt or other member which removably passes through a through seat formed in the lid and which is provided with a head which abuts the edges of said through seat.

Conveniently, in a possible embodiment, said at least one second element is mounted or integrated on the lid and, in particular, is mounted or integrated on a corresponding fastening member which is associated with the lid.

Advantageously, said second element of the magnetic connection means can be defined at least in part by said fastening member, preferably by the end of said fastening member.

Conveniently, in a possible embodiment, said at least one second element is defined at least in part by corresponding zones in ferromagnetic material provided on the bottom of the flame spreader.

Preferably, the flame spreader can be made entirely of ferromagnetic material. Preferably, at least the bottom of the flame spreader or at least some areas of the bottom of the flame spreader, can be made of ferromagnetic or magnetized material.

Advantageously, the locking means between the lid and the flame spreader also comprise at least one fastening member, preferably a nut, which engages on said fastening member associated with the lid to thus constrain the lid to the flame spreader also along the support direction of the lid on the flame spreader, and defining so said assembly. Conveniently, said fastening member engages on the terminal portion of the fastening member, thus clamping the flame spreader between the lid and said fastening member.

Advantageously, said second element of the magnetic connection means can be defined at least in part by said fastening member, and preferably said second element is defined by a nut, more preferably by a blind nut, which is screwed onto the terminal portion of the fastening member.

Advantageously, the locking means between the lid and the flame spreader comprise at least one fastening member which is associated with the lid and which fits into at least one opening which is made in the flame spreader, said at least one fastening member is independent and distinct from said second element of the magnetic connection means.

Conveniently, in a possible embodiment, said at least one second element is mounted on the bottom of the flame spreader. Preferably, said second element comprises a stem for engaging, by interlocking or screwing, within a corresponding seat obtained on the bottom of the flame spreader and a head which is made of magnetized or ferromagnetic material.

Advantageously, the burner also comprises means for fastening the injector holder to the plate of the cooking hob.

Conveniently, the means for fastening the injector holder to the plate of the cooking hob are independent and distinct from said at least one first element, of said magnetic connection means, which is mounted on the injector holder.

Conveniently, the means for fastening the injector holder to the plate of the cooking hob comprise said at least one first element of said magnetic connection means. Preferably, said at least one first element is configured to pass through the plate of the hob on one side and then engage inside a corresponding hole that is made on the injector holder which is intended to be positioned at the other side of the plate of the cooking hob.

Advantageously, said first element can comprise a portion for engagement with the injector holder and a head portion for the magnetic connection.

Preferably, the engagement portion is defined by an elongated portion with a substantially tubular development, while the head portion is provided at one end of the engagement portion and projects radially with respect to the latter.

Preferably, said first element comprises a head portion which is made of magnetized material (in particular it is a magnet) and which is defined by an annular body of tubular or prismatic shape with a central hole inside which an engagement member is inserted (for example a tapered head screw), which thus defines the portion of engagement of the first element with the injector holder and which interacts with the internal walls of the central hole of the annular body and then engages in a corresponding seat obtained in the injector holder, thus allowing fixing on the injector holder the head portion defined by the magnetized annular body. Conveniently, the engagement member and the magnetized annular body are configured in such a way that said engagement member is inserted with its head end inside the central hole of the magnetized annular body, thus resulting embedded inside the latter.

DESCRIPTION OF THE FIGURES

The present invention is further clarified hereinafter in some of its preferred embodiments reported for purely illustrative and non-limiting purposes with reference to the attached drawings, in which:

FIG. 1a shows an exploded perspective view of a burner according to the invention in a first embodiment,

FIG. 1b shows in a perspective view from below the assembly of the flame spreader and the burner lid of FIG. 1a,

FIG. 1c shows a top perspective view of the injector holder of the burner of FIG. 1a,

FIG. 1d shows the burner of FIG. 1a in assembled configuration,

FIG. 2a shows an exploded perspective view of a burner according to the invention in a second embodiment,

FIG. 2b shows the assembly of the flame spreader and the lid of the burner of FIG. 2a,

FIG. 2c shows a top perspective view of the injector holder of the burner of FIG. 2a,

FIG. 2d shows the burner of FIG. 2a in assembled configuration,

FIG. 3a shows an exploded perspective view of a burner according to the invention in a third embodiment,

FIG. 3b shows in a perspective view from below the assembly of the flame spreader and of the burner lid of FIG. 3a,

FIG. 3c shows a top perspective view of the injector holder of the burner of FIG. 3a,

FIG. 4a shows an exploded perspective view of a burner according to the invention in a fourth embodiment,

FIG. 4b shows in a perspective view from below the assembly of the flame spreader and the lid of the burner of FIG. 4a,

FIG. 4c shows a top perspective view of the injector holder of the burner of FIG. 4a,

FIG. 4d shows the burner of FIG. 4a in assembled configuration,

FIG. 5 shows in vertical section a detail of the burner according to the invention in assembled configuration,

FIG. 6 shows in vertical section a detail of a different burner according to the invention in assembled configuration,

FIG. 7 shows in perspective view of the injector holder of the burner according to the invention which is installed on the hob according to a first fixing method,

FIG. 8a shows in perspective view the injector holder of the burner according to the invention which is installed on the hob according to a second method

FIG. 8b shows in vertical section a detail of a burner according to the invention in mounted configuration having the injector holder which is fixed to the cooking hob according to the modality of FIG. 8a,

FIG. 9a shows an exploded perspective view of a burner according to the invention in a fifth embodiment,

FIG. 9b shows in a perspective view from below the flame spreader of the burner of FIG. 9a,

FIG. 9c shows a top perspective view of the injector holder of the burner of FIG. 9a,

FIG. 9d shows the burner of FIG. 9a in the assembled configuration,

FIG. 10 shows in vertical section a detail of a burner according to the invention, in a different version with respect to those of FIGS. 5 and 6, in the assembled configuration,

FIG. 11 shows in vertical section a detail of a burner according to the invention with primary air intake from below the cooking hob,

FIG. 12 shows a perspective view of a variant of the injector holder of the burner according to the invention which is installed on the hob in which the first element comprises a magnetized annular body and an organ for engaging with the injector holder,

FIG. 13 shows in vertical section a detail of a further variant of the burner according to the invention in which the second element is defined by a pin associated with the lid,

FIG. 14 shows in a perspective view from above a possible variant of the injector holder of the burner according to the invention.

DETAILED DESCRIPTION OF THE INVENTION AND OF SOME OF ITS PREFERRED EMBODIMENTS

As can be seen from the figures, the burner 2 according to the invention comprises a flame spreader 4, which can be positioned on an injector holder 6, and a lid 8 positioned above the flame spreader 4.

The burner 2 also includes:

- locking means 59 and 54 configured to prevent, or in any case limit, the movement, at least lateral, between the flame spreader 4 and the lid 8,
- means 70 and 80 for magnetically connecting the injector holder 6 with the flame spreader 4 and/or the lid 8.

The injector holder 6 is configured for—and is intended to—be applied in correspondence with an opening intended to be made in a hob 10 of a caravan, boat and/or vehicle in general. In particular, the injector holder 6 can be of the traditional type and is intended to be attached to the hob 10 of a caravan or motor home or of a boat or vehicle.

Preferably, in some possible embodiments, the injector holder 6 comprises a cavity 7 delimited by a cup support 16, completely closed both at the bottom and laterally and open at the top, to thus allow entry into the cavity 7 of the primary air sucked in from above the hob 10.

Conveniently, in other possible embodiments (see FIG. 11), the injector holder 6 comprises a cavity 7 delimited by a cup support 16 in which at least one opening 79 is made, in particular on the side walls, for the inlet of primary air 88 coming from underneath the hob 10. According to the present invention, the injector holder 6 of FIG. 11 can be used in all the embodiments and variants of the burner described here and/or illustrated in the remaining figures. In particular, it is understood that the injector holder 6 provided with at least one opening 79 for the inlet of primary air 88 from below the hob 10 can have all the remaining characteristics, both essential and preferential, which are described and/or illustrated in the remaining figures, with reference to the injector holder 6 which is configured to allow the primary air sucked in from above the hob 10 to enter the cavity 7.

Conveniently, the injector holder 6 comprises at the bottom an attachment 20 for a gas supply duct, which is in fluid communication with a vertical injector 22 which, preferably, is screwed centrally on the bottom of the cup support 16.

Conveniently, it is mounted on the injector holder 6 at least a first element 70 of the magnetic connection means. In particular, said first element 70 comprises at least one part in magnetized material, preferably a magnet, or comprises at least one part in ferromagnetic material.

Preferably, said first element 70 can comprise an engagement portion 71 with the injector holder 6 and a head portion 72 for the magnetic connection. Conveniently, the engagement portion 71 can be defined by an elongated portion with a substantially tubular development, while the head portion 72 is provided at one end of the engagement portion 71 and projects radially with respect to the latter. In particular, the head portion 72 has a larger cross section than the engagement portion 71 with the injector holder 6. Conveniently, the head portion 72 and the engagement portion 71 can be defined by a single piece (for example the head and the stem of a piece substantially shaped like a bolt or screw) or they can be defined by two distinct pieces. Preferably, as illustrated in greater detail in FIG. 12, said first element 70 can comprise a head portion 72 which is made of magnetized material (in particular it is a magnet) and which is defined by an annular body 72″ of tubular or prismatic shape with a central hole inside which it is inserted an engagement member 71″ (which thus defines the engagement portion 71 of the first element 70 with the injector holder 6), for example a tapered head screw, which interacts with the internal walls of the central hole of the annular body 72″ to then engage in a corresponding seat obtained in the injector holder 6, thus allowing the head portion 72 defined by the magnetized annular body 72″ to be fixed on the injector holder 6. Conveniently, the engagement member 71″ and the magnetized annular body 72″ are configured in such a way that said engagement member fits with its head end inside the central hole of the magnetized annular body, thus being recessed inside the interior of the latter.

Advantageously, in some possible embodiments (see FIGS. 1a-1d, 2a-2d, 3a-3c, 4a-4d), at least the head portion 72 of each first element 70 is made of ferromagnetic material, or vice versa it could be in magnetized material.

Advantageously, in another possible embodiment (see FIGS. 9a-9d), at least the head portion 72 of each first element 70 is made of magnetized material and, preferably, is defined by a magnet.

Conveniently, said at least one first element 70 can be mounted inside the cavity 7 delimited by the cup support 16. In particular, in a possible embodiment (see FIGS. 1a-1d or 4a-4d), the first element 70 can be mounted on a protruding portion 73 which is formed inside the cup support 16 of the injector holder. Conveniently, the protruding portion 73 departs from the internal bottom and/or side walls that delimit the cup support 16. Conveniently, the protruding portion 73 can be defined so that the first element 70 is arranged in proximity to the central zone of the injector holder 6, to thus define a magnetic connection—as described below—between the injector holder 6 and the flame spreader 4 and/or lid 8, in correspondence with their respective central areas.

Advantageously, the side wall of the cup support 16 is provided with at least two flanges 14 projecting outward to adhere from below to the cooking hob 10. Conveniently, in particular when two or more first elements 70 are provided (see FIGS. 2a-2d and 3a-3c), these can be mounted outside the cavity 7 delimited by the cup support 16, in correspondence with the flanges 14.

Conveniently, in correspondence with the flanges 14 two or more holes 13 intended to be crossed by members for fastening the injector holder 6 to the plate of the cooking hob 10.

In a possible and preferred embodiment (see FIG. 7), in correspondence with the flanges 14 two or more first threaded holes 13′ can be obtained to be crossed by screws 11 fastening the injector holder 6 to the plate of the cooking hob 10.

Conveniently, two or more second holes 13″ can be made in correspondence with the flanges 14. ti to be crossed by said first elements 70.

Conveniently, in a possible embodiment (cf. FIGS. 8a and 8b), the fastening members of the injector holder 6 to the plate of the cooking hob 10 are defined by the same first elements 70. In particular, in this case, in correspondence with the flanges 14 there are two or more through holes 13 intended to be crossed by the engagement portion 71 of the first elements 70 while the head portion 72, which has a larger cross-section than said holes, abuts against the upper surface of the plate of the cooking hob 10 and, therefore, the latter is thus clamped between the flanges 14 of the injector holder 6 and the head portion 72 of the first elements 70.

Furthermore, suitably, the side wall of the cup support 16 extends above the flanges 14 to define a collar 15.

Advantageously, the injector holder 6 comprises a first arm 17 for supporting a spark plug 19 and a second arm 18 for supporting a thermocouple 21. Conveniently, the first 17 and the second arm 18 extend, at the collar 15, radially outwards from the external walls of the cup support 16.

Conveniently, in a possible embodiment (cf. FIG. 14), a bracket 90 can be provided (which is obtained in a separate piece from the injector holder 6) for indirectly fixing the injector holder 6 to the plate of the cooking hob 10. Preferably, this bracket 90 has a substantially laminar conformation (for example defined by a piece of shaped sheet metal) and is configured to externally embrace the cup support 16 of the injector holder 6 at the collar 15. Preferably, this bracket 90 comprises:

- two or more first holes 13′, preferably internally threaded, intended to be traversed by screws 11 securing the injector holder 6 to the plate of the cooking hob 10,
- two or more third holes (not shown) intended to be crossed by said first elements 70; in particular, each third hole obtained on said bracket 90 is intended to be facing and aligned with a corresponding second hole 13″ obtained in correspondence with the flanges 14 of the injector holder 6 so that each first element 70 passes through a corresponding second hole 13″ in sequence obtained on the flange 14 of the injector holder 6 and a third hole obtained on said further element.

Conveniently, therefore, in this possible embodiment, the injector holder 6 is indirectly bound to the cooking hob 10 by means of said bracket 90 since the injector holder 6 is bound directly to the bracket 90 by means of the first elements 70, thus making the injector holder 6 integral with said bracket 90, and it is the latter that is fixed directly to the cooking hob 10. This is particularly advantageous since it allows to use injector holder components of a type already available on the market.

The magnetic means of the burner 2 according to the invention—as mentioned—also comprise at least a second element 80 which is mounted and/or obtained on the lid 8 and/or on the flame spreader 4.

The second element 80 can comprise:

- at least one part in ferromagnetic material for the magnetic connection with the magnetized part of a corresponding first element 70, or
- at least a part made of magnetized material, preferably a magnet, for the magnetic connection with a ferromagnetic part of a corresponding first element 70, or
- at least a part made of magnetized material, preferably a magnet, for the magnetic connection with a part of opposite polarity made of magnetized material, preferably a magnet, of a corresponding first element 70; in particular, in this case, the second element 80 and the first element 70 are both two magnets and are arranged—and in particular they are mounted respectively on the injector holder 6 and on the flame spreader 4 or on the lid 8—so that they face each other with poles of opposite sign which, therefore, attract each other.

Basically, the burner 2 comprises magnetic connection means of the injector holder 6 to the lid 8 and/or flame spreader 4 and, suitably, said means comprise:

- at least a first element 70, preferably two or more first elements 70, which is/are made
  - at least in part—of ferromagnetic material, and/or magnetized material,
- at least a second element 80, preferably two or more elements 80, which is/are made
  - at least in part—of magnetized material, and/or of ferromagnetic material, to thus allow magnetic connection with a corresponding first element 70.

Conveniently, the magnetic connection between at least a first element 70 and at least a second element 80 thus ensures a stable coupling and positioning of the lid 8 and/or of the flame spreader 4 on the injector holder 6.

Conveniently, in a possible embodiment (see FIGS. 1a-1d or FIG. 4a-4d), only one second element 80 is provided, for example in ferromagnetic material, which magnetically cooperates with a corresponding first element 70, for example in magnetized material (preferably magnets), which is mounted on the injector holder 6.

Preferably, each first element 70 and each second element 80 are configured and arranged so as to allow/cause their mutual magnetic attraction.

Conveniently, in a possible embodiment (see FIGS. 2a-2d and FIGS. 9a-9d), two second elements 80 are provided, for example in ferromagnetic material, which magnetically cooperate with two respective first elements 70, for example in magnetized material (preferably magnets), which are mounted on the injector holder 6.

Conveniently, in a possible embodiment (see FIGS. 3a-3c), three second elements 80 are provided, for example in ferromagnetic material, which magnetically cooperate with three respective first elements 70, for example made of magnetized material (preferably magnets), which are mounted on the injector holder 6.

Conveniently, the magnetic connection between each first element 70 and a corresponding second element 80 is caused by the magnetic attraction of the ferromagnetic part of one element towards the magnetized part of the other element.

Conveniently, in another possible embodiment, the magnetic connection between each first element 70 and a corresponding second element 80 is caused by the magnetic attraction of the pole of a magnetized part of an element towards the opposite pole of the facing magnetized part of the other element.

The flame spreader 4 defines, together with the lid 8, an internal mixing/distribution chamber 40, which preferably has a radial venturi effect and has a globally circular shape.

Conveniently, one or more recesses 41 are provided in correspondence with the circular edge of the flame spreader 4 which define a suitable housing space for the spark plug 19 and/or the thermocouple 21.

The flame spreader 4 also comprises a vertical duct 42 which faces the injector 22 mounted on the injector holder 6 and at the top opens into the center of the chamber 40 which, preferably, has a radial venturi effect.

Conveniently, the lower surface of the flame spreader 4 has shaped reliefs 43 which extend downwards.

Conveniently, the two elements 70 and 80 (see FIG. 5) connected magnetically can be in direct contact or they can also not be in direct contact (see FIG. 6), although they are in any case at such a distance (for example equal or less than one millimeter) that the magnetic force of attraction between the two elements is in any case sufficient to prevent the easy movement of the flame spreader and/or lid from the injector holder, thus ensuring coupling and stable positioning of the lid 8 and/or the flame spreader 4 on the injector holder 6. Advantageously, in this case (see for example FIG. 6), the shaped reliefs 43 of the flame spreader 4 rest and/or engage in corresponding areas of the injector holder 6. More particularly, the lower part of each shaped relief 43 presents a step, in correspondence with which the relief itself rests on the collar 15 of the cup 16 of the injector holder 6 and, advantageously, also ensures the centering of the or flame spreader with respect to the injector holder.

Basically, in a possible embodiment (see FIG. 6), the body of the flame spreader 4 rests directly on the body of the injector holder 6. In another possible embodiment (see FIG. 5), the body of the flame spreader 4 does not rest directly on the body of the injector holder 6, while it is only the second element 80 which is mounted on the lid 8 and/or flame spreader 4 that rests and comes into contact with the first element 70 mounted on the injector holder 6. Therefore, the lid assembly The flame spreader is mounted on the injector holder only by means of direct contact between the magnetic connection elements 70 and 80.

In another possible embodiment shown in FIG. 10, the body of the flame spreader 4 rests directly on the body of the injector holder 6 and also the second element 80 which is mounted on the lid 8 and/or the flame spreader 4 rests and comes into contact with the first element 70 mounted on the injector holder 6.

Advantageously, in case of direct support of the flame spreader 4 on the injector holder 6 and/or in case of support between the flame spreader 4 and the injector holder 6 through the contact between at least a first element 70 and a second element 80, between the flame spreader 4 and the cavity 7 of the injector holder 6 passages are defined (not shown) to allow the entry of primary air, coming from above the hob 10, into the cavity 7 of the injector holder 6 which houses the injector 22.

The chamber 40 of the flame spreader 4 is delimited at the bottom by a base wall 49, circumferentially by a side wall 50 and at the top by the lid 8.

The wall 50 presents a plurality of doors 52 for the output of the primary gas/air mixture and the generation of a crown of flames. Conveniently, said doors 52 can comprise main doors and secondary doors having different passage sections.

The lid 8 is defined by a laminar-shaped body (ie in which the thickness is lower than the other two dimensions) and, preferably, it is a disk-shaped body. Preferably, the lid 8 is enameled entirely or at least in correspondence with its upper face intended to be visible.

Conveniently, the flame spreader 4 comprises at least one opening 54, preferably through, which is formed on its base wall 49 and in which a corresponding fastening member 59 associated with the lid 8 engages.

Preferably, in some possible embodiments (cf. FIGS. 1a-1d) the opening 54 is through and can pass through the base wall 49 of the flame spreader 4 and also extend inside a tubular section 55 which extends below from the bottom of the base wall 49 of the flame spreader 4.

Conveniently, the fastening member 59 can comprise a pin 60 which is welded to the lower face of the lid 8 (see FIGS. 1a-1d, 2a-2d and 3a-3c) or it can comprise a screw, bolt or similar member 61 which is removably inserted into a through seat 62 defined on the lid 8 (see FIGS. 4a-4d or 9a-9d).

In a possible embodiment (see FIGS. 4a-4d), the fastening member 59 engages inside an opening 54 which is blind, preferably internally threaded, made on the flame spreader 4.

In some preferred forms of embodiment (see FIGS. 1a-1d, 2a-2d and 3a-3c), each fastening member 59 is configured to completely pass through a corresponding through opening 54 of the flame spreader, to then come out of said opening. In particular, suitably, each fastening member 59 has a length such as to pass through the flame spreader 4 so as to protrude/extend from the bottom wall 49 of the same.

Conveniently, the fact that said at least one fastening member 59 associated with the lid 8 within the opening 54 obtained in the flame spreader, it allows to block—and in particular prevents or in any case is limited to the play present between the pin and the opening—the lateral movement between the lid 8 and the flame spreader 4.

Conveniently, in a possible form of realization (see FIGS. 1a-1d) a single pin 60 is provided which is positioned near the center of the lid 8. Conveniently, in another possible embodiment (see FIGS. 2a-2d), two pins 60 in diametrically opposite positions of the lid 8 may be provided. Conveniently, in another possible embodiment (see FIGS. 3a-3c) three pins 60 can be provided which are arranged, substantially equidistant, along the circumferential edge of the lid 8.

In particular, the flame spreader 4 comprises a number of openings 54 corresponding to the number of fastening members 59 which are associated with the lid 8.

In a possible embodiment (cf. for example FIG. 13), each second element 80 of the magnetic connection means can be defined by the same fastening member 59 which is associated with the lid 8, and in which said member 59 is made, at least at its end, of ferromagnetic or magnetized material, to thus interact magnetically with a first element 70, mounted on the injector holder 6, respectively in magnetized (possibly of opposite sign) or ferromagnetic material. In particular, as shown in FIG. 13, the second element 80 comprises the pin 60 itself, or in any case at least its extremal portion, which defines and acts as a fastening member 59 of the lid 8 to the flame spreader 4.

Conveniently, in some preferred embodiments, the second element 80 can be mounted on the fastening member 59 which is associated with the lid 8 and which passes through the flame spreader 4.

Conveniently, in other possible embodiments (see FIGS. 4a-4d and 9a-9d), each second element 80 can be independent from the fastening member or members 59 which is/are associated with the lid 8 and which crosses the flame spreader 4. Preferably, in a possible embodiment (see FIGS. 4a-4d), each second element 80, made of ferromagnetic or magnetized material, it is mounted directly on the bottom of the flame spreader 4. Conveniently, when the second element 80 is mounted directly and only on the bottom of the flame spreader 4, said second element 80 can have a stem 84, preferably at least partially threaded, which engages within a blind hole 86, preferably internally threaded, obtained on the bottom of the flame spreader 4 and also can have a head 85 which is made of magnetized or ferromagnetic material. Preferably, in a possible embodiment (see FIGS. 9a-9d), each second element 80, made of ferromagnetic or magnetized material, is integrated directly on the bottom of the flame spreader 4 and, in particular, is defined by at least one corresponding zone of the bottom of the flame spreader itself. Preferably, in a possible embodiment, the flame spreader 4 can be entirely made of ferromagnetic material.

In some preferred embodiments such as those illustrated in particular in FIGS. 1a-1d to 3a-3c, each element 80 comprises a nut 81, preferably blind, which is made of ferromagnetic material and which engages at the end of the fastening member 59, once the latter has passed through a corresponding through opening 54 made in the flame spreader. Preferably, in this case, at least the terminal portion of each fastening member 59 is threaded to allow the nut 81 to be screwed. Advantageously, the nut 81 in ferromagnetic material has a greater mass than the pin 60 alone, thus defining a greater force magnetic connection with a corresponding first element 70 made of magnetized material mounted on the injector holder 6.

Advantageously, therefore, the burner 2 comprises locking means which are configured to join together the flame spreader 4 and lid 8 so as to thus define an assembly 100. Conveniently, said locking means can comprise at least one fastening member 59 associated with the lid 8 and which engages—by screwing or by interlocking—in a corresponding opening 54 which is blind and which is made in the flame spreader 4 (see FIGS. 4a-4d) or they can comprise at least one fastening member 59 associated with the lid 8 and which, after passing through a corresponding a through opening 54 and obtained in the flame spreader 4, it engages with a fastening member, for example a nut, which preferably (but not necessarily) is defined by the second element 80 of the magnetic connection means. Advantageously, in this way the lid and the flame spreader define a single assembly 100 which is easier and quicker to remove. In particular, these locking means are configured to lock together the flame spreader 4 and the lid 8 both laterally and vertically (ie along the overlapping/resting direction of the lid 8 on the flame spreader 4).

Preferably, these locking means are defined by each fastening member 59 which is associated with the lid 8 and which passes through a corresponding opening 54, which is through and formed in the flame spreader, and are also defined by a fastening member which is advantageously defined by second element 80, preferably shaped like nut 81, which engages with the fastening member 59 associated with the lid, since in this way the flame spreader 4 is substantially held/clamped between the lid and the second element 80, preferably defined by the nut 81.

In a possible embodiment (see FIGS. 9a-9d), the second elements 80 made of ferromagnetic material, preferably of ferrous material, are integrated on the bottom of the same flame spreader 4. Preferably, the entire flame spreader 4 is made of ferromagnetic material, preferably of ferrous material. Conveniently, the first elements 70 are made of magnetized material, preferably they are defined by magnets, and are mounted on the injector holder 6.

Conveniently, in this case, the lid 8 can be constrained to the flame spreader 4 independently of the second elements 80 and the first elements 70 which magnetically connect the flame spreader 4 to the injector holder 6. Preferably, the lid 8 can be locked to the flame spreader 4 by means of at least one fastening member 59 which is defined by a screw 61 which engages with its head in a seat 62 obtained in the lid 8 and which engages with the terminal threaded portion within an opening 54, which is blind and internally threaded, made in the flame spreader 4. Conveniently, it is understood that—both for the embodiment of FIGS. 4a-4d that for that of FIGS. 9a-9d—the fastening member 59 could also be welded to the lower face of the lid 8 and pass through an opening 54, which is through, obtained in the flame spreader 4 and then engages with a tightening, such as a nut.

The operation of the burner according to the invention is traditional in that the gas coming from the duct 20 escapes from the injector 22 and enters the vertical duct 42 of the flame spreader 4, dragging with it the primary air sucked from above or below the hob 10.

Advantageously, in the possible embodiments of the burner in which the primary air is sucked from above the hob 10, the burner itself is practically insensitive to the phenomenon of streaming. Advantageously, the flow of gas and primary air that begins to mix in the vertical duct 42 then completes its mixing in the corresponding radial venturi chamber 40, delimited at the top by the lid 8.

The mixture thus obtained, which is formed inside the mixing chamber 40, then feeds the ring of flames that comes out of the doors 52 of the flame spreader 4.

It should in any case be pointed out that, depending on the needs of the market, the burner can be equipped with or without a spark plug 19 and/or a thermocouple 21.

From what has been said it is clear that the burner according to the invention is somewhat more advantageous than the traditional burners installed in the cooking hobs of caravans, boats and vehicles in general, and in particular.

- it has a particularly pleasant overall aesthetic effect given that, once assembled, it is externally similar to traditional burners, with the only visible portion consisting of the fully enamelled upper surface of the lid,
- once the injector holder has been fixed to the hob, the assembly and/or disassembly of the lid-flame spreader assembly on the injector holder itself is particularly quick and simple and does not require any special tools,
- it is quite simple and inexpensive to make.

The present invention has been illustrated and described in some of its preferred embodiments, but it is understood that executive variations may be applied to them in practice, without however departing from the scope of protection of the present patent for industrial invention.

Number	Date	Country	Kind
102021000026498	Oct 2021	IT	national
102021000026939	Oct 2021	IT	national

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