Patent Description:
In order to cook with a gas hob, a pan is disposed on a burner provided on the top plate at a height defining a flame distance. A grate is provided on a hotplate and the pan rest on the grate, aligned on the respective burner. The hob has support legs rising from the hob to the burner. In one embodiment, the support leg of the grate is in the form of a frame surrounding the entire hob and grate bars extending from the frame to each burner. In another embodiment, the frame of the single hob grill around the burner is provided to surround the periphery with a circular frame. It has an inverted L-like form rising from the frame ring with the support legs facing each other. Each support leg extends upwards at equal height and bends towards each other, forming a supporting portion in a plane extending from its free ends parallel to the top plate.

<CIT> discloses a gas hob with a heat shield and a hob with at least one gas burner on a tempered glass or glass ceramic cooktop. In the hob, the heat shield is rectangular in shape and the hob includes a frame that attaches shape to the heat shield in the polygonal flat disc structure to protect the hob thermally. Further relevant prior art is given in <CIT> and <CIT>.

The object of the invention is to increase the burner operating performance in hob with a single grate and a heat shield around the burner.

In order to achieve the said objective, the invention a hob is comprising a bowl-shaped burner body disposed in an opening on a top plate and a flame spreader is extending radially outwardly on the burner body so as to provide an air intake corridor with the top plate; a grate having a frame that surrounds the burner body at a distance and at least one carrier arm rising from the frame and extending towards the flame spreader; a flat heat shield arranged as a spacer between the burner body and the frame. The frame is in the form of a flat plate and thickness of the frame is surrounding the heat shield from its periphery is arranged to equal or smaller than the height of the heat shield. The frame in the form of a flat thin plate does not create any obstacles in front of the air intake corridor. In this way, the burner combustion efficiency is high, and the emission values of the hob are reduced. In a possible embodiment, the burner body is an injector holder in the form of a cup and connected to the injector burner body with gas line connection. Layout can be arranged vertically or horizontally.

In a preferred embodiment of the invention, a mounting section at the bottom of the carrier arm is extending from the top of the frame to the outer edge in an L-like form. In this way, the mounting section contact surface between the frame and the carrier arm is increased by ensuring that the mounting section wraps around the frame both from the top and from the outside. In an alternative embodiment, it is also possible for the mounting section of the carrier arm to extend to the inner edge of the frame.

A preferred embodiment of the invention includes a base following the mounting section gradually rests at least partially on the top plate. The base allows the support arm to be supported both by the frame and directly by the top plate.

In a preferred embodiment of the invention, the carrier arm is in the form of a solid thin and flat plate rising perpendicular to the frame. The flat and vertical plate carrier arm provides the least intersection possibility with the flame crown formed by the flame spreader.

In a preferred embodiment of the invention, the thickness of the carrier arm is substantially equal to the thickness of the frame. In this way, it is possible to obtain support arms, for example, from the same sheet metal from which the frame is produced.

According to the invention, a flat upper wall of the frame of the grate is aligned with the upper wall of the heat shield to extend in the same horizontal plane. In this case, intake air pass over the frame extending from the bottom of the air intake corridor without disturbed by any surface deformation that will reduce the pressure of the radially inwardly moving ambient air.

In a preferred embodiment of the invention, the flame spreader comprises a rim extending parallel to the radial inward air intake corridor to confine from the top, through which primary air pass through between the flame spreader and heat shield. The rim part extends inward on the flame spreader and provides a corridor with air passage on the heat shield. The ambient air cools and reduces thermal deformations the heat shield by passing over.

In a preferred embodiment of the invention, a mounting part of the heat shield is aligned into a mounting hole provided on a flange of the burner body extending to the opening such that a fixing element is able to be inserted. In this way, when the burner body is inserted into the opening, it is possible to mount the heat shield on the top plate over the flange.

In a preferred embodiment of the invention, the heat shield is having a stepped outer edge fitted from a lower wall to the frame in a covering manner. Since the frame rest on the heat shield, it is ensured that the frame hides the mounting section of the heat shield and the top plate.

In a preferred embodiment of the invention, an elevated portion equal to the thickness of the frame is provided between the outer edge and the planar upper wall. In this way, when the frame is disposed on the outer edge from the lower wall, it is disposed on the same plane with the upper edge from the adjacent edge with the elevation part.

In a preferred embodiment of the invention, the heat shield is formed from a metal plate. The metal plate acts as a wing and ensures that the heat emitted from the burner body is transferred to the ambient by convection. Since the top plate is not directly adjacent to the burner body, it is removed from the high temperature region formed in the neighbouring part.

In a preferred embodiment of the invention, the cooktop includes ceramic or toughened glass. In this way, when the burner body is disposed in its opening, protected from the negative effects of temperatures with its heat shield.

In this detailed explanation, the subject development of the invention is explained without any limitation and only with reference to examples to better explain the subject.

In <FIG>, a flame spreader (<NUM>) on a burner body (<NUM>) disposed in a circular opening on a hard glass cooktop (<NUM>) and a hob grate (<NUM>) with four carrier arms (<NUM>) around it is shown in perspective. The flame spreader (<NUM>) is in a cylindrical form and there is a flat metal cover (<NUM>) on top part. A heat shield (<NUM>) extending radially outwards from the opening (<NUM>) rest on the top plate (<NUM>). The heat shield (<NUM>) is formed by pressing a flat metal plate and is one piece in annular structure. A hob grate (<NUM>) with a rectangular flat frame (<NUM>) is removably seated on the junction between the heat shield (<NUM>) and the hob (<NUM>). The heat shield (<NUM>) is in a circular gradual form and an elevated portion (<NUM>) provided by the outer stage part and an inner edge (<NUM>) of the frame (<NUM>) are adjacent to each other. Four carrier arms (<NUM>) perpendicular to the frame (<NUM>) facing each other are mounted on the frame (<NUM>) from a corresponding mounting section (<NUM>) in the lower part of the frame (<NUM>) in a way that makes an angle of <NUM> degrees. The support arm (<NUM>) has an L-like form with its long arm extending above it at a distance from the cover (<NUM>). The short arm forms a lifting arm (<NUM>) and raises a long support extension (<NUM>) parallel to the cooktop (<NUM>) at a distance, higher than the height of the cover (<NUM>). The lower part of the lifting arm (<NUM>) has a flat base (<NUM>) that fits directly onto the hob (<NUM>). The base (<NUM>) is adjacent to the mounting section. A through hole (<NUM>) is provided at the top of the base (<NUM>). A silicone or rubber foot (not shown) can be passed through the hole (<NUM>) to support the base (<NUM>). An outer edge (<NUM>) in the same form as the inner edge (<NUM>) of the frame (<NUM>) faces outward, forming a step on the top plate (<NUM>). The upper wall (<NUM>) of the frame (<NUM>) and the upper wall (<NUM>) of the heat shield (<NUM>) adjacent to it are provided in a same plane parallel to and above the top plate (<NUM>).

In <FIG>, the hob is shown in cross-section. The opening (<NUM>) is formed by making a circular hole on the cooktop (<NUM>), which is a toughened glass plate structure. The aluminum burner body (<NUM>) in the form of a cup is disposed in the opening (<NUM>) with its opening is facing upwards. An injector (<NUM>) provided in the base is disposed vertically in an inner chamber (<NUM>) surrounded by the burner body (<NUM>). The injector (<NUM>) is connected to a gas inlet (<NUM>) at its lower end facing outward. A flange (<NUM>) extends radially outward on the upper part of the burner body (<NUM>). Opposite mounting holes (<NUM>) are drilled on the flange (<NUM>). The heat shield (<NUM>) is formed from metal sheet and surrounds the mouth (<NUM>) of the burner body (<NUM>) from an inner edge (<NUM>). A mounting portion (<NUM>) adjacent to the inner edge (<NUM>) is collapsed into the mounting hole (<NUM>) aligned. Thus, a connection element, for example, secure the heat shield (<NUM>) from the inner edge (<NUM>) to the burner body (<NUM>) by passing through the mounting hole (<NUM>) in such a way that its head fits into the screw mounting part (<NUM>). The heat shield (<NUM>) extends radially outwards with an upper wall (<NUM>) that is flat and parallel to the top plate (<NUM>) and covers the opening (<NUM>) between its inner edge (<NUM>) and an opposite outer edge (<NUM>). The outer edge (<NUM>) is in a stepped structure and bends vertically downwards as much as the thickness of the frame (<NUM>) and forms an elevated portion (<NUM>). The lower wall (<NUM>), which forms the flat base of the frame (<NUM>), sits on the outer edge (<NUM>) close to the inner edge (<NUM>). In this case, the upper wall (<NUM>) of the frame (<NUM>) and the upper wall (<NUM>) of the heat shield (<NUM>) are aligned in the same plane. On the other hand, the lower wall (<NUM>) of the frame (<NUM>) sits on the cooktop (<NUM>) near the outer edge (<NUM>). The outer edge <NUM> and the lower wall <NUM> are in the same plane.

The mushroom-shaped flame spreader (<NUM>) sits on the open mouth (<NUM>) of the burner body (<NUM>) in a removable way. A flat rim (<NUM>) forming the lower part of the cylindrical flame spreader (<NUM>) extends radially outwards and an air intake corridor (a) at a distance between them and the upper wall (<NUM>) limits the entrance. The rim part (<NUM>) reaches an inward channel (<NUM>) from which it is directed to a venturi element in the center. In the upper part of the flame spreader (<NUM>), the holes (<NUM>) separated by the tooth-shaped walls are covered by the metal cover (<NUM>). The support extension (<NUM>) at the upper end of the lifting arm (<NUM>) extends towards the cover (<NUM>) in a way that leaves a distance from the flame spreader. The rim (<NUM>) together with the channel (<NUM>) following it form the air intake corridor (a), which provides radial inward air movement between the heat shield (<NUM>) upper wall (<NUM>) and the lower part of the flame spreader (<NUM>). The air intake corridor (a) reaches the inner chamber (<NUM>) from one end and provides mixing of the flammable gas coming from the injector (<NUM>) with the ambient air. The gas-air mixture is taken out of the holes (<NUM>) and feeds the flame spreader formed by ignition.

The height of the outer edge (<NUM>) and the inner edge (<NUM>) of the frame (<NUM>) on the hob grill (<NUM>) is adjusted equally. In addition, the lower wall (<NUM>) and the upper wall (<NUM>) are adjusted equally to provide a rectangular section. The height of the outer edge (<NUM>) and the inner edge (<NUM>) is less than the width of the lower wall (<NUM>) and the upper wall (<NUM>). Since the inner edge (<NUM>) and the elevation part (<NUM>) have equal heights, when the single hob grill (<NUM>) is disposed on the hob (<NUM>) by wrapping around the burner body (<NUM>), it does not create any obstacle in front of the planar floor of the air intake corridor (a).

Claim 1:
A gas hob comprising a cup-shaped burner body (<NUM>) disposed in an opening (<NUM>) on a top plate (<NUM>) and a flame spreader (<NUM>) extending radially outwardly on the burner body (<NUM>) so as to provide an air intake corridor (a) with the top plate (<NUM>); a grate (<NUM>) having a frame (<NUM>) that surrounds the burner body (<NUM>) at a distance and at least one carrier arm (<NUM>) rising from the frame (<NUM>) and extending towards the flame spreader (<NUM>); a flat heat shield (<NUM>) arranged as a spacer between the burner body (<NUM>) and the frame (<NUM>) characterized in that the frame (<NUM>) is in the form of a flat plate and thickness of the frame (<NUM>) surrounding the heat shield (<NUM>) from its periphery is arranged to equal or smaller than the height of the heat shield (<NUM>) wherein a flat upper wall (<NUM>) of the frame (<NUM>) of the grate (<NUM>) is aligned with the upper wall (<NUM>) of the heat shield (<NUM>) to extend in the same horizontal plane and a flat rim (<NUM>) forming the lower part of the cylindrical flame spreader (<NUM>) extends radially outwards to limit entrance of an air intake corridor (a) with the upper wall of the heat shield (<NUM>) wherein the air intake corridor (a) reaches the inner chamber (<NUM>) of the burner body from one end and provides mixing of the flammable gas coming from an injector (<NUM>) with the ambient air.