GB2052039A - Burner - Google Patents

Abstract

An aerated gas burner for barbecues is made of sheet metal, with flame ports (6) in the sides of the burner body and the top of the burner formed by a top wall (4) which overhangs the side walls in which the flame ports are provided, thereby forming an integral drip cover shielding the flame ports from falling materials. <IMAGE>

Description

SPECIFICATION Burner This invention relates to aerated gas burners, and has particular but not exclusive reference to burners for use in cooking appliances, in particular barbecues.

In barbecues and other appliances in which food is cooked by heating from below, there is a risk that a gas burner used to provide heat may have its flame ports blocked by fat and other materials falling on to it. To overcome this, barbecue gas burners have been provided with separate drip covers but known burners are made of cast iron and because of this and the provision of a separate drip cover, are clumsy, expensive and difficult to make.

According to the present invention, there is provided an aerated gas burner having a burner chamber with a top wall and side walls, flame ports being provided in at least one side wall, and the top wall overhanging at least the side wall or walls provided with flame ports, thereby forming an integral drip cover shielding the flame ports from falling materials. Preferably, the burner is made of sheet metal, which can be readily fabricated to the shapes required to form the burner chamber and overhanging top wall? Preferably, the burner chamber is elongate and generally reitangular in plan.

The flame ports are preferably cruciform.

A burner embodying the invention is shown in the accompanying drawings, in which: Figure 1 is an end view of the burner, Figure 2 is a side view of the burner, and Figures 3 and 4 are side and bottom views of a modified burner.

The drawings show a burner made of sheet steel, preferably stainless steel, for use in a barbecue. The burner body consists of a shallow elongate rectangular pan 5 of pressed steel and a top wall 4 of steel bent to a circular arcuate crosssection as shown in Figure 1. The side walls of the pan 5 have outwardly and downwardly bent flanges 12, and the edges 13 of the top member 3 are bent round these flanges to secure the top member on the pan. The top member and pan, together with sheet metal end walls 11, constitute the burner body within which is a burner chamber.

A curved venturi and mixing assembly 7 provided with a gas nozzle 8 communicates with the burner chamber through the bottom of the pan 5, to supply a mixture of gas and air to the burner chamber.

Each side wall 2 of the pan 5 is provided with a row of flame ports 6. These ports are cruciform and their dimensions and spacing are selected so that the burner will operate stably using natural gas or L.P.G. as fuel. Retention holes 1 5 may be provided in the side walls, to stabilise the flames at the ports 6. Additional stabilisation can be provided by metal wire gauze immediately inside the flame ports but this measure is to be avoided if possible and in general is unnecessary. The interior of the burner chamber is preferably, completely unobstructed.

The ports 6, 1 5 are simply stamped out of the sheet metal of the burner body.

Flame-transfer ports 10 may be provided in one or both ends of the burner.

The top wall 4 is completely imperforate, and its edge regions 12, as can be seen in Figure 1, overhang the side walls 2 of the burner body in which the flame ports are provided, whereby the edge regions of the top wall form integral drip covers. Consequently fat from food, and other material, falling on the top of the burner, will be deflected by the top wall, clear of the flame ports, and therefore the latter will not become blocked by such material.

The end wall members 11 are recessed. To provide additional protection for the transfer ports 10, these are covered by a shield 9 attached to the burner body end and forming a chamber which is closed except for narrow slits 14 at the ends, adjacent to the side walls of the burner body in which the flame ports are provided.

Figures 3 and 4 show portions of a modified burner. The principal modification is that flametransfer ports 1 6 are provided in a line across the bottom of the burner pan 5, instead of in the end of the burner. These ports 1 6 are protected by a shield 1 7 welded to the bottom of the pan 5, and provided with dimples 1 8 to space the shield from the pan bottom. This construction is simpler than that of figures 1 and 2.

Figure 3 also shows additional flame-retention holes, there being three of these between each pair of cruciform flame ports 6.

The burner described can provide stable and reliable combustion using a variety of gaseous fuels, and while being cheap and easy to produce nevertheless provides protection against blockage of its ports.

Claims

1. An aerated gas burner having a burner chamber with a top wall and side walls, flame ports being provided in at least one side wall, and the top wall overhanging at least the side wall or walls provided with flame ports, thereby forming an integral drip cover shielding the flame ports from falling materials.

2. A burner as claimed in claim 1, made of sheet metal.

3. A burner as claimed in claim 1 or 2 having an elongate burner chamber of generally rectangular plan.

4. A burner as claimed in any preceding claim having a transverse array of flame-transfer ports.

5. A burner as claimed in any preceding claim in which the flame ports are cruciform.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Burner This invention relates to aerated gas burners, and has particular but not exclusive reference to burners for use in cooking appliances, in particular barbecues. In barbecues and other appliances in which food is cooked by heating from below, there is a risk that a gas burner used to provide heat may have its flame ports blocked by fat and other materials falling on to it. To overcome this, barbecue gas burners have been provided with separate drip covers but known burners are made of cast iron and because of this and the provision of a separate drip cover, are clumsy, expensive and difficult to make. According to the present invention, there is provided an aerated gas burner having a burner chamber with a top wall and side walls, flame ports being provided in at least one side wall, and the top wall overhanging at least the side wall or walls provided with flame ports, thereby forming an integral drip cover shielding the flame ports from falling materials. Preferably, the burner is made of sheet metal, which can be readily fabricated to the shapes required to form the burner chamber and overhanging top wall? Preferably, the burner chamber is elongate and generally reitangular in plan. The flame ports are preferably cruciform. A burner embodying the invention is shown in the accompanying drawings, in which: Figure 1 is an end view of the burner, Figure 2 is a side view of the burner, and Figures 3 and 4 are side and bottom views of a modified burner. The drawings show a burner made of sheet steel, preferably stainless steel, for use in a barbecue. The burner body consists of a shallow elongate rectangular pan 5 of pressed steel and a top wall 4 of steel bent to a circular arcuate crosssection as shown in Figure 1. The side walls of the pan 5 have outwardly and downwardly bent flanges 12, and the edges 13 of the top member 3 are bent round these flanges to secure the top member on the pan. The top member and pan, together with sheet metal end walls 11, constitute the burner body within which is a burner chamber. A curved venturi and mixing assembly 7 provided with a gas nozzle 8 communicates with the burner chamber through the bottom of the pan 5, to supply a mixture of gas and air to the burner chamber. Each side wall 2 of the pan 5 is provided with a row of flame ports 6. These ports are cruciform and their dimensions and spacing are selected so that the burner will operate stably using natural gas or L.P.G. as fuel. Retention holes 1 5 may be provided in the side walls, to stabilise the flames at the ports 6. Additional stabilisation can be provided by metal wire gauze immediately inside the flame ports but this measure is to be avoided if possible and in general is unnecessary. The interior of the burner chamber is preferably, completely unobstructed. The ports 6, 1 5 are simply stamped out of the sheet metal of the burner body. Flame-transfer ports 10 may be provided in one or both ends of the burner. The top wall 4 is completely imperforate, and its edge regions 12, as can be seen in Figure 1, overhang the side walls 2 of the burner body in which the flame ports are provided, whereby the edge regions of the top wall form integral drip covers. Consequently fat from food, and other material, falling on the top of the burner, will be deflected by the top wall, clear of the flame ports, and therefore the latter will not become blocked by such material. The end wall members 11 are recessed. To provide additional protection for the transfer ports 10, these are covered by a shield 9 attached to the burner body end and forming a chamber which is closed except for narrow slits 14 at the ends, adjacent to the side walls of the burner body in which the flame ports are provided. Figures 3 and 4 show portions of a modified burner. The principal modification is that flametransfer ports 1 6 are provided in a line across the bottom of the burner pan 5, instead of in the end of the burner. These ports 1 6 are protected by a shield 1 7 welded to the bottom of the pan 5, and provided with dimples 1 8 to space the shield from the pan bottom. This construction is simpler than that of figures 1 and 2. Figure 3 also shows additional flame-retention holes, there being three of these between each pair of cruciform flame ports 6. The burner described can provide stable and reliable combustion using a variety of gaseous fuels, and while being cheap and easy to produce nevertheless provides protection against blockage of its ports. Claims

1. An aerated gas burner having a burner chamber with a top wall and side walls, flame ports being provided in at least one side wall, and the top wall overhanging at least the side wall or walls provided with flame ports, thereby forming an integral drip cover shielding the flame ports from falling materials.

2. A burner as claimed in claim 1, made of sheet metal.

3. A burner as claimed in claim 1 or 2 having an elongate burner chamber of generally rectangular plan.

4. A burner as claimed in any preceding claim having a transverse array of flame-transfer ports.

5. A burner as claimed in any preceding claim in which the flame ports are cruciform.

6. A burner as claimed in any preceding claim having flame-retention holes adjacent to the flame ports.

7. An aerated gas burner substantially as herein described with reference to Figs. 1 and 2 or Figs. 3 and 4 of the accompanying drawings.