EP0491580B1 - Gas burner for cooking range, cooking top or the like - Google Patents

Abstract

This burner comprises on the one hand a support (2) in the form of a hollow and opening piece comprising a central well (6) forming an intake pipe for secondary air and delimiting with the wall (7) of the hollow piece an annular chamber (8) supplied with a mixture of gas and primary air, and on the other hand a head (1) constituted by three superposed and removable elements comprising a ring (3) resting on the support (2) while leaving between it and this support an annular space which communicates with the chamber (8) to allow the outlet of a pilot flame, a first disc (4) resting on the ring (3) to form outlet orifices for gas and comprising a central sleeve (16) which interacts with the central well (6), and a cover plate (5) resting in a spaced manner on the disc (4) and comprising a centring shaft (19) which penetrates into the sleeve (16) and into the central well (6) of the support (2) while allowing the secondary air to pass under the cover plate (5). This burner can equip for example a cooking top or a cooking range and can directly support any type of receptacle to be heated. <IMAGE>

Description

The present invention essentially relates to an improved gas burner for a stove, a hob or the like.

Gas cooktops and stoves are most often equipped with a plurality of gas burners which, in general, include a head provided with gas outlet orifices and adaptable on a support comprising means of gas supply in particular.

However, with these burners, the containers are generally supported by an independent grid interposed between the burner and the bottom of the container, which poses problems of aesthetics, accessibility to the burner and cleaning of the hob or the hob. upper part of the stove with burners.

Also, the object of the present invention is to remedy in particular the above drawbacks, by proposing an improved gas burner which is very easy to assemble and disassemble and which, moreover, performs by itself and directly the function of a stable support for containers of any shape.

To this end, the subject of the invention is an improved gas burner for stove, hob or the like and of the type comprising a head provided with gas outlet orifices and adaptable on a support comprising gas supply means in particular, characterized in that the support is a hollow and emerging part comprising a central well forming a secondary air supply duct and delimiting with the wall of the hollow part an annular chamber supplied with primary gas-air mixture, while the head consists of three superimposed and removable elements including a crown resting on the support while leaving between it and this support an annular space communicating with said annular chamber to allow the exit of a pilot flame, a first disc-shaped part resting on the crown to form said gas outlet orifices and comprising a central plug-in sleeve on said central well, and a second disc-shaped part constituting a cap resting in a spaced manner on said first disc-shaped part and comprising a centering pin penetrating into the central sleeve of the first disc-shaped part and in the central well of the support so as to allow the passage to secondary air under said cap.

This hat, according to another characteristic of the invention, comprises on its lower face abutments for bearing on the first disc-shaped part and, on its periphery, arms giving it a star shape or the like to allow the cap to directly and stably support any container.

According to another characteristic of this burner, the first disc-shaped part carries on its underside and in the vicinity of its periphery a succession of slots of substantially trapezoidal shape which bear on the abovementioned crown to form gas outlet orifices allowing a substantially horizontal development of the flame.

According to a preferred embodiment, the aforementioned slots are supported on a flange of the aforementioned crown which, in the position of support of this crown on the support, leaves an annular space between this support and the flange.

According to yet another preferred embodiment of the invention, the crown has on its edge resting on the support small recesses forming with this support orifices for the outlet of the primary gas-air mixture, and on its external periphery, small stops for maintaining a radial annular spacing between the crown and the support.

It should also be noted that the aforementioned crown is fitted into an annular shoulder formed in the upper part and emerging from the aforementioned hollow part or support.

The burner according to another preferred embodiment of this invention is further characterized in that the second disc-shaped part constituting the cap has a central part of diameter larger than that of the support, the crown, and the first shaped part. of disc with slots.

Thus, the flames leaving the burner substantially horizontally and normally going beyond the outline of the cap, will not directly heat the container for a relatively reduced gas flow, which can be particularly advantageous for cooking certain foods.

Other advantages will appear better in the detailed description which follows and which refers to the appended drawings, and in which.

Figure 1 is an exploded perspective view of a gas burner according to the principle of the invention.

Figure 2 is an axial sectional view of this burner in the assembled position of all the elements which compose it.

Figure 3 is a half sectional view but on a larger scale scale of the burner shown in Figure 2.

With particular reference to FIG. 1, it can be seen that a gas burner according to this invention essentially comprises a hollow and through-piece 2 forming a support for a head 1 constituted by three superimposable and removable elements, namely a crown 3 resting on the support. 2, a first disc-shaped piece 4 resting on the crown 3 and a second disc-shaped piece 5 constituting a cap resting on the first disc-shaped piece 4.

The hollow piece forming a support 2 can be mounted in any suitable manner on a hob T or the tray of a cooker (not shown) and has a central well 6 forming a secondary air supply duct. This central well 6 defines, with the annular wall 7 of the support 2, an annular chamber 8 supplied with a primary gas-air mixture by a suitable pipe 9 opening into said chamber, and which can be seen more clearly in FIG. 2.

The hollow annular part or support 2 has at its upper part and opens out an annular shoulder 10 capable of receiving the crown 3.

This crown 3 consists of a ring-shaped part 11 provided with a flange 12.

The axial height of the ring 11 is slightly greater than the height of the shoulder 10 so that in the bearing position of the crown 3 in the shoulder 10, an annular space 13 clearly visible in FIG. 3 is left between part 10a of the shoulder 10 and the flange 12 of the crown 3.

The communication of this annular space 13 with the annular chamber 8 of the hollow part or support 2 is ensured by small recesses 14 provided on the edge 11a, opposite the flange 12, of the ring 11 of the crown 3, so that , when the edge 11a of the ring 11 is in abutment in the shoulder 10, the small recesses 14 in the form of an arc of a circle form outlets for the primary gas-air mixture which escapes through the annular space 13 thus allowing the exit of a pilot flame (not shown) from the burner.

The ring 11 of the crown 3 also has on its outer periphery small stops 15 in an appropriate number and distributed in an appropriate manner for example along two diameters of the ring 11 as can be seen in FIG. 1. These small stops 15 allow, when the crown 3 is fitted into the shoulder 10 of the support 2, to maintain a small radial spacing between the ring 11 and the part 10a of the shoulder 10. Thus, when the crown 3 fits into the 'shoulder 10 of the support 2, the annular spacing 13 allowing the exit of a pilot flame is guaranteed by the height of the ring 11 of the crown 3 and the small radial stops 15 provided on the external surface of this ring.

The first disc-shaped part 4 rests at its periphery on the flange 12 of the crown 3, and comprises a central sleeve 16 which, when the crown 3 is fitted into the shoulder 10 of the support 2, is fitted into the well central 6 of the support 2, which central well has at one of its ends a shoulder 6a in which the sleeve 16 abuts.

In the vicinity of the periphery of the first disc-shaped part 4, and on its underside, is provided a multiplicity of slots 17 of substantially trapezoidal shape, that is to say more precisely of slots defined each by two blanks 17a of trapezoidal shape, as can be clearly seen in FIGS. 2 and 3. These slots 17, delimited by the blanks 17a of trapezoidal shape and bearing on the flange 12 of the crown 3, form with said flange outlet orifices of the primary gas-air mixture which are such that the flames will develop in a substantially horizontal plane from said orifices.

The second disc-shaped part constituting the cap 5 rests on the first part described above in the form of a disc 4, and this spaced apart from this part. To this end, the cap 5 has on its lower face stops 18 forming spacers between said cap and the upper face of the part 4. As can be seen in the figures, these support stops 18 can be notched at their ends. to hang on the edge of the disc-shaped part 4 and thus allow centering of the cap 5.

This cap 5 comprises, projecting from its lower face and at the center of its central circular part 5a, a cruciform axis 19 according to the embodiment shown, and which can penetrate, during assembly, in the central sleeve 16 of the disc 4 and in the central well 6 of the support 2 in which said central sleeve 16 is fitted. Thus, the secondary air supplied by the central well or duct 6 will reach the underside of the cap 5 and will flow radially outward since, thanks to the stops support 18, a space will be left between the cap 5 and the first disc-shaped part 4.

The periphery of the cap or disc 5 is provided with a plurality of integral arms 20 giving the cap 5 the shape of a star allowing the cap to directly and stably support any container, said cap being firmly held horizontally by means of the axis 19 passing axially through the burner.

It will be observed here that the diameter of the disc constituting the central part 5a of the cap 5 will preferably have a larger diameter than that of the disc 4, of the crown 3 and of the support 2, as can be seen in FIG. 2. From the so, the flames F developing horizontally under the central part 5a of the cap 5 will not directly heat, for a reduced gas flow, the bottom of the container resting on the cap, which can be advantageous for carrying out certain cooking operations.

A compact gas burner has therefore been produced according to the invention, comprising parts which are always correctly assembled and fitted together by mutual self-centering, having good heating reliability whatever the heating regime, and ensuring excellent stability at container resting directly on the burner cap, the radial arms of which preferably extend in the same plane as that of the central part of the cap.

Of course, the invention is in no way limited to the embodiment described and illustrated, which has been given only by way of example.

Thus the arms extending radially from the central part of the cap can be provided in a number and in any shape, as well as the shape and the number of the small recesses 14 and the small stops 15 of the crown 3 can be any.

Claims (5)

1. Gas burner for a cookstove, a cooking top or the like and of the type comprising a head (1) provided with gas outlet apertures and adaptable onto a support (2) formed of a hollow and opening part comprising a central shaft (6) defining with the wall (7) of the hollow part an annular chamber (8) fed with a primary air-gas mixture whereas the head (1) consists of three superimposed and removable elements comprising a ring (3) resting upon the support (2), a first disk-shaped part (4) resting upon the ring (3) and comprising a central sleeve (16) which may be fitted onto the said central shaft (6) and a second disk-shaped part constituting a cap (5) resting upon the said first disk-shaped point (4) and comprising a centring pin (19) penetrating into the central sleeve (16) of the first disk-shaped part (4) and into the central shaft (6) of the support (2), characterized in that :

   - the cap (5) comprises on its bottom face abutments (18) for bearing upon the first disk-shaped part (4) to permit the passage of secondary air fed from the central shaft (6) and on its periphery arms (20) imparting a star-like shape or the like thereto to allow the cap (5) to support any vessel whatsoever directly and in a stable manner;

   - the first disk-shaped part (4) carries on its bottom face and in the vicinity of its periphery a series of crenels (17) of a substantially trapezoidal shape which are bearing upon the ring (3) to form the gas outlet apertures permitting a substantially horizontal development of the flame ; and

   - the ring (3) rests upon the support (2) while leaving between it and this support an annular space (13) communicating with the annular chamber (8) to permit the output of a pilot flame.
2. Burner according to claim 1, characterized in that the aforesaid crenels (17) are bearing upon a flange (12) of the aforesaid ring (3) which in the position of this ring bearing upon the support (2) leaves the aforesaid annular space (13) between this support and the said flange.
3. Burner according to claim 1 or 2, characterized in that the ring (3) comprises on its edge (11a) resting upon the support (2), small recesses (14) forming together with this support outlet apertures for the gas-primary air mixture and on its external periphery small abutments (15) for retaining a radial annular space between the ring (3) and the support (2).
4. Burner according to one of claims 1 to 3, characterized in that the aforesaid ring (3) is fitted into an annular shoulder (10) formed in the upper and opening portion of the aforesaid hollow part or support (2).
5. Burner according to one of the foregoing claims, characterized in that the second disk-shaped part constituting the cap (5) has a central position (5a) with a diameter greater than that of the support (2), of the ring (3) and of the first disk-shaped part (4) with crenels.

Images