Wood gasifier - fire basket

Abstract

The invention relates to a fire basket (1) having an inner wall (3), an outer wall (2), a first opening (20) on the top side of the fire basket (1), a second opening (19) on the bottom side or at the bottom side of the first basket (1), one or more holes (4) in the inner wall (3) at the top side of the inner wall (3) through which air can flow into an upper combustion zone of the fire basket (1), one or more holes or openings (12) at the bottom side of the inner wall (3) through which air can flow into a lower combustion zone of the fire basket (1). The distance (a) between the one or more holes at the top side of the inner wall (3) and the one or more holes or openings (12) at the bottom side of the inner wall (3) is at least 10 cm. As a result of the fire basket, it is possible to also burn low-flammable gases such as those that are produced during wood combustion.

Description

[0001] Wood gasifier - fire basket

[0002] Description

[0003] The invention relates to a fire basket for outdoor use. Examples of outdoor areas include a garden or terrace.

[0004] A fire basket for outdoor use is known from the publication DE 102021 209754 A1. The fire basket has a roughly hemispherical outer wall with an upper and a lower opening. The fire basket comprises a bowl into which fuel can be placed. When inserted into the outer wall, the bowl is located entirely within a lower part of the outer wall. The bowl contains openings through which the air required for combustion can flow into a combustion zone. Such a fire basket is less suitable for burning wood with high efficiency because the gases produced during wood combustion can only be combusted to a limited extent.

[0005] To burn wood with high efficiency, wood can be burned in multiple stages. To achieve this, a first combustion zone of a wood-burning device can be filled with wood. In the first combustion zone, the wood burns with the aid of primary air, generating heat. Light wood gases are produced, which can be combusted in the first combustion zone. Less flammable components of the resulting wood gas are directed to a second combustion zone. In the second combustion zone, the less flammable or difficult-to-ignite components can burn at very high temperatures with the help of secondary air.

[0006] From the publication US 2020 / 224879 A1, a fireplace is known that comprises a combustion chamber with a base and an opening at the top. A secondary chamber with a base, at least one air inlet, and at least one air outlet is provided.

[0007] The object of the invention is to create a fire basket with advantageous properties that can be intended for outdoor use. Preferably, it should be able to burn wood with very good efficiency.

[0008] The object of the invention can be achieved by a fire basket which can comprise the features of the first claim.

[0009] A fire basket is used to achieve this aim. The fire basket can have a first opening on its top side. The fire basket can have a second opening, which can be located on the bottom side or near the underside of the fire basket, for example. The first opening can be provided so that fuel can be placed into the fire basket. The first opening can therefore be the largest opening in the fire basket so that fuel can be easily brought into the fire basket. The second opening can be provided so that air can reach the fuel. Air can then flow through the second opening into at least one zone which can contain fuel intended for combustion. The first opening on the top side of the fire basket can therefore be larger than the second opening on the bottom side or near the underside.The fuel can be a solid material, such as wood, or it can be wood-based. Wood can be in the form of logs, pellets, compressed wood chips, or compressed wood flour, for example. Wood can be in the form of wood briquettes.

[0010] Fuel can be liquid. The fuel can be ethanol, for example. Fuel can be gaseous.

[0011] The fire basket can comprise an inner wall and / or an outer wall. The inner wall can be located completely or at least predominantly within the outer wall. The outer wall can be the outermost wall of the fire basket, which can therefore always be visible from the outside regardless of the viewing angle. The inner wall can be concealed by the outer wall depending on the viewing angle. The inner wall and / or outer wall can be circumferential, for example ring-shaped in cross-section at least in sections. The inner wall and / or outer wall can then, for example, at least in sections be shaped like a cylinder. The inner wall and / or outer wall can be circumferential, specifically square in cross-section. The inner wall can at least partially be an innermost wall of the fire basket. There can be no further wall or walls between the inner wall and the outer wall. The inner wall and / or outer wall can each be one-piece, i.e.i.e., manufactured from a single part in a single production step. However, it is also possible that two or more parts of the inner wall and / or outer wall were initially manufactured separately. The separately manufactured parts can then be joined to form the inner wall or outer wall.

[0012] The first opening at the top of the fire basket can be provided at the top of the outer wall and / or the inner wall. The first opening at the top of the fire basket can be an upper opening of an attachment that is placed on the outer wall and / or the inner wall.

[0013] The second opening can be an open underside of the outer wall and / or the inner wall, i.e. an opening at the lower end of the outer wall and / or the inner wall. The second opening can be formed by a hole in the outer wall and / or the inner wall. There can be several second openings through which air can flow into the fire basket. It can be that air can flow through the at least one second opening into the area between the inner wall and the outer wall. The inner wall can have one or more holes through which air can flow into a combustion zone of the fire basket.

[0014] One or more holes or openings may be provided adjacent to the underside of the inner wall. The holes may be present in the inner wall. Holes may be present in the lower third or lower quarter of the inner wall. The underside of the inner wall may be open, i.e., an opening. Air flowing through the one or more holes in the lower third or lower quarter of the inner wall and / or through the open underside or opening may be directed to a first, lower combustion zone within the fire basket for fuel combustion.

[0015] One or more holes can be provided, for example, adjacent to the top or at the top of the inner wall. One or more holes can be arranged in the upper third or in the upper quarter of the height of the inner wall. If the inner wall is 30 cm high, for example, then the one or more holes can be located at least 20 cm above the underside of the inner wall and thus in the upper third of the height of the inner wall. The fire basket can be designed so that the air previously heated by the inner wall can flow into a combustion zone through the one or more holes provided in the upper third or upper quarter. The one or more holes are provided in the inner wall.

[0016] One or more holes provided in the inner wall can be arranged at the level of the upper third, at the level of the upper quarter, or at the level of the upper fifth of the height of the outer wall. If the outer wall is 40 cm high, for example, then the one or more holes can be located at least 30 cm above the underside of the outer wall and thus at the level of the upper quarter of the height of the outer wall. Such an arrangement can ensure that previously heated air can flow into an upper combustion zone in order to burn difficult-to-ignite wood gases. In particular, the holes in the inner wall are aligned so that air can flow essentially horizontally or at an angle downwards into the second combustion zone in order to reliably burn even difficult-to-ignite gases in a central area of ​​the fire basket.The area of ​​the inner wall containing these holes may be vertical to allow air to flow substantially horizontally into the second combustion zone. The area of ​​the inner wall containing these holes may taper upwards to allow air to flow downwards into the second combustion zone.

[0017] In particular, the air is directed in such a way that, on the one hand, it can burn wood or a wood-based material in a first combustion zone, and, on the other hand, in a previously heated state, it can burn difficult-to-ignite gases produced by the burning of the wood in a second zone.

[0018] The second combustion zone is generally located above the first combustion zone. The one or more holes in the inner wall that lead into the second combustion zone are generally a considerable distance from the one or more holes or openings in the inner wall that lead into the first combustion zone. This considerable distance can be at least 15 cm or at least 20 cm if large logs with a length of 25 cm or 33 cm are to be burned. For smaller pieces of wood, smaller distances may be sufficient, for example at least 5 cm or at least 10 cm. This considerable distance ensures that difficult-to-ignite gases that can arise during wood combustion can also be reliably burned. The distance must therefore be chosen accordingly if it is to be possible to burn even difficult-to-ignite gases.

[0019] The maximum inner diameter of the inner wall is generally larger than the clear distance in order to be able to burn difficult to ignite gases in a second zone. The maximum inner diameter of the inner wall can be 1.5 times or 2 times larger than the clear distance in order to be able to burn difficult to ignite gases in a second zone. The maximum inner diameter of the inner wall can be 3 times or 2.5 times smaller than the clear distance in order to be able to burn difficult to ignite gases in a second zone. However, this does not preclude the maximum inner diameter of the inner wall from being smaller than the clear distance in order to be able to burn difficult to ignite gases in a second zone.

[0020] One or more holes in the inner wall can be elongated holes. One or more holes in the inner wall can be circular or square. Holes in the inner wall can be arranged in a ring. Elongated holes can extend along the ring shape, i.e., parallel to the ring shape. Holes can be created, for example, by punching, milling, or drilling.

[0021] Between the holes in the inner wall at the top of the inner wall and the one or more holes or openings at the bottom of the inner wall, there can be one or more further holes in the inner wall. However, it is preferable that the area of ​​the inner wall between the one or more holes or openings at the bottom and the one or more openings at the top is closed, i.e. no air can flow through. A closed area of ​​the inner wall between the one or more holes or openings at the bottom and the one or more openings at the top can extend over a length of at least 5 cm or at least 10 cm so that secondary air can be sufficiently heated. Air can then flow adjacent to the inner wall and be heated over a distance of at least 5 cm or at least 10 cm without being able to flow into the interior of the inner wall.

[0022] The distance and / or cross-section between the inner wall and the outer wall can taper toward the one or more holes leading into the second combustion zone, i.e., those located at the top of the inner wall. This advantageously increases the flow cross-section and thus the air flow velocity as the combustion chamber approaches the one or more holes leading into the second combustion zone. Air can then flow into the second combustion zone at a relatively high flow velocity to ensure thorough mixing with difficult-to-ignite gases, thereby optimizing the combustion of difficult-to-ignite gases.

[0023] It is particularly advantageous if the outer wall tapers, at least in an upper region, toward the one or more openings at the top, in order to incline the airflow so that it can pass through the openings at the top at a particularly high speed, thus further improving combustion. For this reason, the outer wall can taper conically toward the one or more openings at the top. However, a curved taper, such as a partially spherical taper, is preferable in order to gradually change the direction of the airflow in a streamlined manner.

[0024] Starting at a central section, the fire basket can taper downwards, allowing it to be securely mounted on a stand or tripod with a lower center of gravity. This taper can also be straight or curved.

[0025] For the reasons stated above, the outer wall can preferably be partially spherical. The base of the fire basket can deviate from the partially spherical shape for stability reasons. The base of the fire basket can, for example, be shaped like a ring disk. Air can then flow into the fire basket from below through the hole in the ring disk. Alternatively or additionally, holes can be provided on the underside of the outer wall through which air can flow into the fire basket. Such holes can be arranged in a ring shape. The holes, for example arranged in a ring shape, through which air can flow into the fire basket, can be limited to the lower area of ​​the fire basket, for example to the lower quarter of the outer wall of the fire basket.

[0026] The distance and / or cross-section between the inner wall and the outer wall can gradually taper toward the one or more holes leading into the second combustion zone. The distance and / or cross-section between the inner wall and the outer wall should, if possible, not taper in steps to initially avoid air turbulence. This can prevent detrimental air turbulence, which can adversely reduce the flow velocity. The outer wall and / or inner wall can, at least in an upper section, extend in a straight line toward the one or more holes mentioned above to avoid steps.

[0027] If air escapes from the upper holes in the inner wall, air turbulence is desired. It can therefore be advantageous to provide a large number of small holes instead of a fewer number of larger holes. More than 30 holes, or more than 50 holes, or more than 70 holes can therefore be provided, for example in a ring shape near the top of the inner wall. The number of holes in the upper area of ​​the inner wall can be limited to 500 or 300 for space reasons. The diameter of the holes can be less than 5 cm or less than 3 cm. The diameter of the holes can be greater than 0.5 cm or greater than 1 cm.

[0028] The cross-section between the outer wall and the inner wall can have a local maximum between the one or more holes at the top of the inner wall and the one or more holes or openings at the bottom of the inner wall. This can result in the flow velocity of air flowing between the inner wall and the outer wall initially decreasing, only to accelerate again after passing the maximum of the cross-section. This can ensure that air flows particularly slowly when heat can and should be transferred to the air through a heated inner wall and / or a heated outer wall in order to ignite difficult-to-ignite gases.

[0029] Curved and / or straight lines of the inner and / or outer walls are possible in order to avoid disadvantageous air turbulence. For example, the outer wall can be curved in order to reduce the distance to the inner wall and thus the flow cross-section. In order for the distance and / or the cross-section between the inner and outer walls to taper gradually, the outer wall can be curved, at least in the area of ​​the taper. The outer wall can be shaped like part of a sphere, part of an oval, or part of an egg, at least in this area. The outer wall can therefore be curved outwards, at least in this area, as is the case with part of a sphere, part of an oval, or part of an egg. The inner wall can be straight in this area. An upper area of ​​the inner wall can therefore be shaped like a cylinder or a truncated cone, for example.Alternatively or additionally, the inner wall may have a lesser curvature than the outer wall, so that the distance and / or cross-section gradually taper toward one or more holes or openings. The aforementioned truncated cone may taper downwards. The taper of the truncated cone may be slight.

[0030] The curvature of the outer wall can favorably change the direction of air flow toward the second combustion zone. The outer wall is preferably shaped like part of a sphere so that air can be directed from an inlet opening toward the second combustion zone with as little turbulence as possible. It is also possible to achieve a maximum cross-section between the outer wall and inner wall between the one or more holes at the top of the inner wall and the one or more holes or openings at the bottom of the inner wall. The flow velocity of air flowing between the inner wall and outer wall can therefore initially decrease in order to absorb as much heat from a heated inner wall.Subsequently, the flow velocity of the then strongly heated air can be accelerated again so that strongly heated air can advantageously escape at high speed from the one or more openings at the top of the inner wall.

[0031] The maximum diameter of the sphere can be limited, for example, to 100 cm or 80 cm. The maximum diameter of the sphere can be, for example, at least 9 cm, or at least 14 cm, or at least 40 cm, or at least 50 cm.

[0032] Preferably, the outer wall is curved outward and connected to the inner wall in such a way that a lower section of the outer wall is prestressed toward the top of the outer wall by the inner wall, i.e., is pulled toward the top. This mechanically stabilizes the fire basket. Thin material thicknesses for the inner and / or outer walls are then sufficient to provide a stable fire basket. This allows the fire basket to be relatively lightweight and therefore easy to handle without great effort.

[0033] To suitably brace the inner wall to the outer wall, the inner wall can be cylindrical or truncated cone-shaped, at least in sections. Furthermore, the shape of the inner wall can follow the shape of the outer wall and run approximately parallel to the outer wall. At least one section of the inner wall can thus also be curved. A section of the inner wall that is also curved can form the underside of the inner wall or belong to the underside of the inner wall. The inner wall and outer wall can thus run parallel or at least essentially parallel, at least in sections, in a lower region.

[0034] The shape and dimensions of the upper edge of the inner wall can correspond to the shape and diameter of the upper edge of the outer wall in order to be able to connect the inner wall to the outer wall at the top. The top of the outer wall can therefore be connected to the top of the inner wall. The upper edge of the outer wall can be connected to the upper edge of the inner wall in a form-fitting and / or material-fitting and / or force-fitting manner. The connection can be such that no air can flow through the connection, or at least virtually no air can flow through. Air then flows at least predominantly only through the one or more holes in the upper area of ​​the inner wall into a combustion zone.

[0035] The connection between the top side of the outer wall and the top side of the inner wall can be intended for bracing. For example, the upper edge of the inner wall can rest on the upper edge of the outer wall in a prestressed state for prestressing. By prestressing the upper edge of the inner wall, for example in a ring-shaped manner, on the upper edge of the outer wall, a sufficiently high level of airtightness can be achieved. An airtight connection is therefore possible. It is possible to additionally have an integral connection such as an adhesive or welded joint. However, an additional integral connection can be dispensed with. It is also possible to have a sealing ring between the upper edge of the inner wall and the upper edge of the outer wall in order to ensure an airtight connection in a particularly reliable manner.The sealing ring can be made of a sufficiently heat-resistant material.

[0036] By bracing the top surface of the outer wall with the top surface of the inner wall, two relatively unstable parts can be combined into a stable assembly, as a profile is clamped together. Out-of-roundness can be eliminated by bracing. Bracing can be particularly advantageously achieved using a conical surface.

[0037] The upper edge of the inner wall can rest at an angle on the upper edge of the outer wall in such a way that the upper edge of the outer wall is pushed outwards. This can compensate for manufacturing inaccuracies in the shape of the outer wall that affect the shape of the upper edge of the outer wall. For example, the outer wall is at least predominantly or completely shaped like part of a sphere. The upper edge of the outer wall is then ideally circular. Due to manufacturing inaccuracies, the upper edge of the outer wall can deviate from the ideal circular shape and be, for example, slightly oval. If the inner edge of the inner wall is circular, the oval shape of the upper edge of the outer wall is also pressed into the circular shape. For this reason, the upper edge can be at least partially shaped like a cone or widen towards the top like a funnel.Even if the inner edge of the inner wall is not perfectly circular, it is still possible to improve the upper edge of the outer wall into a more circular shape. This can affect the overall shape of the outer wall. It is therefore possible to manufacture the outer wall from a particularly thin material in a technically particularly simple way without having to pay attention to excessively high manufacturing accuracy. This is of particular interest for the outer wall because the material expenditure or the area of ​​the outer wall generally exceeds the area of ​​the inner wall or the material expenditure of the inner wall. It is therefore particularly advantageous if the outer wall can be manufactured with the lowest possible material expenditure and / or in a technically particularly simple way.The inner wall can therefore be manufactured with a thicker wall thickness than the outer wall, allowing the outer wall to be deformed without itself being deformed. The inner wall is then at least barely deformed. For the same reason, the inner wall can alternatively or additionally be manufactured from a mechanically more stable material than the outer wall. The inner wall can be manufactured with greater technical complexity than the outer wall, so that the manufacturing inaccuracies of the inner wall are smaller than those of the outer wall. This also contributes to the ability of an outer wall to be pressed into a desired, ideal shape in the event of manufacturing inaccuracies.

[0038] The inner wall is preferably produced by deep drawing to achieve a relatively high level of manufacturing accuracy. At least one preform can be produced by deep drawing. The outer wall can be produced by a technically simpler, rotary spinning process, which may result in greater manufacturing inaccuracies.

[0039] The outer wall can also be produced through a deep-drawing process, despite the undercut, using an elastomer core. The core allows a pre-drawn blank to be transformed into a spherical shape with an undercut. The core can then be removed from the spherical shape. For bracing purposes, a lower section of the inner wall can be firmly connected to a lower section of the outer wall, for example, using a screw connection. A screw connection is particularly suitable because the desired preload can be created in a technically simple manner by tightening a screw or nut.

[0040] Bracing can be achieved using a web. The web can be attached to the underside of the inner wall, for example, by a positive fit. The positive connection can be a screw connection to allow for controlled tension buildup. Other positive connections, such as one or more rivets, are also possible. The web can also be attached to a lower area of ​​the outer wall, for example, by a material fit. The material fit can be a welded connection.

[0041] For manufacturing reasons, it is preferable for the bracing to be achieved by a web that is held only by a positive fit. The web can be attached to the underside of the inner wall. The web can be spring-loaded and push an upper edge of the outer wall upward. The upper edge of the outer wall can have a gap into which the web is pressed.

[0042] The web can include a spacer element at the upper edge of the outer wall, which rests against the outside of the inner wall. The position of the web relative to the inner wall can be adjusted, which can facilitate installation. The inner wall can also be centered.

[0043] The web can rest at least partially against the inside of the outer wall in order to stabilize the web.

[0044] The web can be made of steel, particularly spring steel.

[0045] The bridge can be secured on its underside to prevent twisting.

[0046] A tray can be inserted into the inner wall. The tray can be designed to hold fuel for combustion. The tray can be designed to collect ash. The tray can have openings and / or holes through which air can flow into the tray. This allows the fuel to be supplied with oxygen for combustion.

[0047] One or more of the shell's holes can be elongated. One or more of the shell's holes can be circular or square. Holes in the shell can be arranged in a ring. Elongated holes can extend along the ring's shape.

[0048] The bowl can be loosely inserted into the inner wall so that it can be grasped and removed from the inner wall without having to loosen any connections. To allow a bowl to be loosely inserted into the inner wall, the inner wall can taper towards the bottom. For this reason, the inner wall can taper downwards in an arc. To make inserting the bowl particularly easy, the upper edge of the bowl can be circular and the taper of the inner wall can be shaped like a partial sphere, for example. The upper edge of the bowl can then rest on the inside of the inner wall. There is no need to pay attention to any particular alignment. If the bowl can be removed from the inner wall, this can be intended to allow ash to be disposed of easily. This means that the entire fire basket does not have to be grasped and handled to dispose of ash.

[0049] The height of the shell is small compared to the height of the inner wall and / or the outer wall. The height of the inner wall can, for example, be at least twice the height of the shell.

[0050] The bowl can preferably be inserted into the inner wall in such a way that a lower section of the bowl protrudes downwards relative to the inner wall. Holes and / or openings in the bowl can then also be located below the inner wall. These holes or openings can be arranged in a ring shape and can be located below the inner wall. This allows air to flow particularly freely into the bowl for burning fuel.

[0051] Holes in the bowl can be arranged so that they are surrounded by the inner wall when the bowl is inserted into the inner wall. The bowl can then be inserted in such a way that air can flow into the bowl through these holes to allow fuel to burn.

[0052] Since the outer and inner walls, unlike the shell, can be clamped together, the wall thicknesses of the outer and inner walls can be smaller than the wall thickness of the shell. The wall thicknesses of the outer and inner walls can be 10%, 15%, or 20% smaller than the wall thickness of the shell. The wall thickness of the shell can, for example, be at least 0.5 mm or at least 0.8 mm, and the maximum wall thicknesses of the outer and inner walls can be a maximum of 0.9 mm or 0.8 mm if the outer wall is clamped to the inner wall. Particularly preferred are particularly thin wall thicknesses of, for example, up to 0.7 mm. Particularly thin wall thicknesses can be heated quickly, so that secondary combustion can be achieved particularly quickly.

[0053] A grate can be inserted into the bowl. Fuel can then be placed on the grate to burn. Ash can then fall through the grate and be collected below the grate in the bowl. The burning of fuel is therefore not impaired by ash. Openings in the grate are preferably chosen so that even normally large wood pellets cannot fall through them. The most common wood pellets are 6 to 8 mm in diameter. Sometimes wood pellets have a diameter of 4.5 or 10 mm. The maximum size of an opening in the grate can therefore be, for example, 5.5 mm or 4 mm. The maximum size of an opening in the grate can also be 10 mm or 8 mm, so that pellets can hardly pass through the grate. The minimum size of an opening in the grate can therefore be, for example, at least 3 mm or at least 4 mm.The bars can be at least 4 mm or at least 5 mm high. The bars can be at least 4 mm or at least 5 mm or at least 6 mm high and / or wide. The bars can be a maximum of 12 mm or a maximum of 10 mm or a maximum of 8 mm high and / or wide. A grille dimensioned this way is easy to manufacture and ensures good air supply.

[0054] The grate can be loosely attached to the bowl so it can be easily removed without tools. The grate can be removed to make it easier to remove ash from the bowl afterward.

[0055] The bowl can have one or more holes and / or openings above and below the grate to direct air to the grate for combustion. Fuel can then be supplied with air from both the top and bottom, which has a positive effect on combustion. One or more holes and / or openings below the grate can be covered by a cover so that ash cannot, or at least hardly, fall out of the bowl through the opening. The cover can be inclined towards the center of the bowl to direct ash towards the center of the bowl. The bowl and cover can be shaped so that the shaped elements of the bowl and cover are interlocked, similar to a labyrinth seal. Air can pass through the interlocked shaped elements. Ash can be retained by the interlocked shaped elements.

[0056] At least 30, at least 40, or at least 50 holes can be provided above the grate to create the desired air turbulence. The number of holes can be limited to 200 or 100 for space reasons. It can be advantageous for wood burning if the holes in the bowl arranged above an inserted grate have a smaller diameter than the holes that can be provided on the top side of the inner wall. The grate can be placed on the cover. There can be a flat area inside the bowl, for example, onto which the grate can be placed. The cover can be connected to the flat area and can run, for example, at an angle downwards and inwards.

[0057] The grate can be formed from bars, with bars arranged in a lower and an upper level. The bars of the upper level can form an angle with the bars of the lower level, i.e., they can intersect. The angle can be at least 70°, for example, or 90°. The bars within a level can run parallel. By arranging bars at different levels, the air supply to the fuel from below can be further improved, thus further improving fuel combustion.

[0058] The bars of the lower level can be connected to the bars of the upper level, for example, by a material bond. The grid and thus the interconnected bars can be manufactured by die casting in a single operation.

[0059] The maximum distance between two bars on a single level can be 5.5 mm or 4 mm to prevent wood pellets from falling through the grate. Nevertheless, logs can still be adequately supplied with air from both below and above for combustion.

[0060] The bowl may include a handle that can be grasped to remove the bowl from the inner wall. The handle may be a bracket. The handle may be a rod. The rod may have a knob, i.e. an extension, at its upper end to make it easier to remove the bowl using the handle. The handle may be attached below an inserted grate on the bottom of the bowl. The grate may have an opening through which the handle extends when the grate is inserted into the bowl. This is particularly possible when the handle is a rod or a rod with a knob. Such a rod-shaped handle is therefore particularly preferable, especially since the installation space required for it is very small. This leaves sufficient space for fuel. The rod can be attached in the middle of the bottom of the bowl to avoid imbalances when lifting the bowl.

[0061] The bowl can be made of an upper and lower section, which are welded together, for example, to create suitable large openings in a technically simple manner. The upper and lower sections can be firmly connected by a screw connection. The screw connection can be designed so that it can be removed without tools. The lower section can then be removed from the upper section without tools, allowing the lower section to be easily cleaned if necessary. The bottom of the bowl is always closed to prevent ash from falling out.

[0062] The tray may have a grille permanently attached to the tray. The tray may have a handle permanently attached to the tray. The handle may reach to the top of the tray or protrude from the top. The handle may be rod-shaped to minimize space requirements and / or to allow the handle to be positioned centrally. The rod may have a knob on its top to enable the handle to be held securely, for example using a tool. The rod may be permanently attached to the grille, for example by welding. This means that there may be one unit comprising the tray, grille, and handle. The tray, grille, and handle may be permanently attached to one another to make the unit easy to handle. This advantageously prevents parts of the unit from accidentally becoming detached.After a firing process, such a unit containing residual fuel and / or ash can then be easily replaced with another unit containing fuel, allowing the fire basket to operate as continuously as possible. The invention then relates to a system comprising a fire basket and a second unit.

[0063] A lower opening in the outer wall can include an upwardly projecting collar. This collar prevents ash that has accidentally entered the outer wall from escaping.

[0064] The fire basket can have an attachment above the outer and / or inner walls, which can be attached to the outer and / or inner walls. The fire basket attachment can further improve the combustion of difficult-to-ignite gases. The fire basket attachment can be shaped like a nozzle, i.e., taper towards its outlet. The fire basket attachment can therefore taper upwards when installed to further improve combustion. In particular, secondary combustion of difficult-to-ignite gases resulting from wood combustion in a second combustion zone can be further improved by the fire basket attachment. The fire basket attachment can serve as a windbreak to protect the combustion of difficult-to-ignite gases from wind disturbances. The fire basket attachment can be at least 4 cm or at least 8 cm high to improve combustion.The fire basket attachment cannot be higher than 20 cm or 15 cm to avoid unnecessarily high material costs. A fire basket attachment that is too high also impairs optimal operation. For example, a flame would no longer be clearly visible. The maximum diameter of the fire basket attachment can be at least 100 cm or at least 80 cm. The minimum diameter of the fire basket attachment can be at least 20 cm or at least 30 cm.

[0065] The fire basket attachment can be loosely attached to allow for the removal of a bowl inside the fire basket, or at least to make it easier to remove. The fire basket attachment can then be removed without first having to loosen any connection.

[0066] The aforementioned outer wall and / or the shell can be made of steel or comprise steel. A steel other than stainless steel can be selected. The steel can be coated internally and / or externally. The coating can be made of enamel, for example. The outer wall can thus be manufactured with minimal technical effort.

[0067] The inner wall may be made of a different steel than the steel used for the outer wall and / or the shell. For example, the inner wall may be made of stainless steel or include stainless steel to provide improved heat and / or corrosion resistance.

[0068] The grate can be made of iron or an iron alloy. The grate can comprise iron or an iron alloy. The fire basket attachment can advantageously be made of aluminum or copper. Aluminum or copper can heat up very quickly due to their good thermal conductivity, which can improve the early combustion of difficult-to-ignite gases in an adjacent second combustion zone. The fire basket attachment can also be made of another metal such as stainless steel and / or ceramic and / or glass. The fire basket attachment can be produced by die casting with very small manufacturing inaccuracies. The fire basket attachment can be manufactured more technically simply by winding and a subsequent printing process. The fire basket attachment can also be made of stainless steel or another steel. The steel can be coated.

[0069] The fire basket may comprise a frame. The outer wall may be placed on the frame. There may be a loose connection between the outer wall and the frame. The fire basket can then be removed from the frame without tools. The frame may, for example, be a tripod. The frame may be formed by at least one wire. The frame may comprise a heat-shielding wall, such as a sheet metal, to protect a surface from heat. The heat-shielding wall may be shaped like a bowl or a flat plate. The heat-shielding wall is particularly provided when the height of the frame is low.

[0070] There may be a grill attachment that can be placed on the upper edge of the fire basket. The grill attachment allows the fire basket to be used for heating food. The grill attachment can include a grill plate, a pot, a pan and / or a wok for heating food on the grill plate or in the pot, pan or wok. The grill plate can be ring-shaped, i.e. have an opening in the middle. The diameter of the opening in the grill plate can be smaller than the diameter of the opening at the top of the fire basket, i.e. the opening in the fire basket that is delimited by the uppermost edge of the fire basket. This opening can be the opening at the top of a fire basket attachment. If there is no fire basket attachment, then this opening can be the opening at the top of the outer or inner wall.

[0071] If the opening of the grill plate is smaller than the opening on top of the fire basket, the grill plate will be heated directly by flames. However, this cannot guarantee that even a large-diameter grill plate will be heated satisfactorily and evenly.

[0072] When viewed from above, the grill plate can have at least the same diameter as the fire basket to provide a large grilling surface. When viewed from above, the grill plate can protrude laterally from the fire basket to provide a large grilling surface and to protect the user from flames. When viewed from above, the grill plate can be less than 1.5 times the diameter or less than 1.3 times the diameter of the fire basket to avoid instability.

[0073] To ensure such a large grill plate is heated satisfactorily and evenly, flame deflectors can be provided. The grill attachment is then designed so that flames escaping from the fire basket, for example, are redirected toward the outside of the grill plate. The grill attachment can include a spacer equipped with deflectors.

[0074] One or more openings, for example, in the form of gaps in the spacer, can be provided beneath the grill plate, pot, pan, or wok to redirect flames and / or direct heat toward the outside of the grill plate. The grill attachment can include such openings below the grill plate. However, such an opening can be formed by the upper edge of the fire basket and the attached grill attachment.

[0075] Several openings can be arranged next to each other. The openings can form a ring shape to allow flames and / or heat to be directed evenly toward the outside of the grill plate.

[0076] Openings or gaps can be arranged one above the other. This applies at least if the grill attachment is placed on the upper edge of the fire basket. Openings can therefore be present in a first and a second level. Openings in the first level can be arranged in a ring around the top opening of the fire basket when viewed from above or above the edge of the top opening of the fire basket when viewed from above. Openings in the second level can be arranged in a ring around the top opening of the fire basket when viewed from above or above the edge of the top opening of the fire basket when viewed from above. By providing openings in different levels, it can be achieved that a grill plate can be heated evenly.

[0077] The total number of openings on a lower level can be larger than the total number of openings on an upper level in order to further improve the even heating of a grill plate.

[0078] Stacked openings or gaps can be separated by a ring on the grill attachment to ensure effective heat distribution. The height of lower gaps can be greater than the height of the gaps above to ensure effective heat distribution. Stacked gaps can be of equal length. Stacked gaps can run parallel to each other. This creates openings on a lower level that are, in total, larger than the sum of the openings on an upper level.

[0079] Instead of gaps, differently shaped openings, such as circular holes, can be provided. Such holes can be located on two different levels. The diameters of holes in a lower level can be larger than those in a higher level. However, the number of holes in a lower level can be equal to the number of holes in an upper level, so that the total number of openings in the lower level is larger than the total number of openings in the upper level.

[0080] The grill attachment is an independent invention that can also be used for other fire baskets.

[0081] Openings for redirecting heat toward the outer edge of a mounted grill plate can also be created using a device attached to the top opening of the fire basket. However, this can have several disadvantages. If the fire basket is used without a grill plate, flames could still be redirected outward, which should be avoided for safety reasons. If the fire basket is used without a grill plate, the device could increase the risk of injury, or elements of the device could become caught on clothing, for example.

[0082] The fire basket is particularly suitable for burning wood pellets, as it allows for a particularly even flame pattern to be created for a long time. This allows for a very long burn time of, say, more than an hour without having to refill fuel such as wood pellets.

[0083] The invention is explained in more detail below using exemplary figures.

[0084] Figure 1 : Fire basket;

[0085] Figure 2: Frame with heat-protecting wall;

[0086] Figure 3: Section through a fire basket;

[0087] Figure 4: Section through the fire basket from Figure 3 with air flow pattern;

[0088] Figure 5: Section of the top of the fire basket;

[0089] Figure 6: Section of the underside of the fire basket;

[0090] Figure 7: Grid;

[0091] Figure 8: Bowl;

[0092] Figure 9: Fire basket attachment;

[0093] Figure 10: Fire basket with tripod;

[0094] Figure 11: Section through the outer and inner walls; Figure 12: Section through a fire basket;

[0095] Figure 13: Section through a fire basket

[0096] Figure 14: Grid

[0097] Figure 15: Cross section of lattice bars

[0098] Figure 16: Transition between bars;

[0099] Figure 17: Frame;

[0100] Figure 18: Section of a fire basket;

[0101] Figure 19: Fire basket with frame;

[0102] Figure 20: Section through fire basket with wood pellet attachment

[0103] Figure 21 : Bowl with wood pellet attachment and lifting tool;

[0104] Figure 22: Bowl with wood pellet attachment and lifting tool;

[0105] Figure 23: Section through fire basket with fire basket attachment;

[0106] Figure 24: Section through fire basket with spark guard and lid;

[0107] Figure 25: Bridge

[0108] Figure 26: Sectional view with mounted web from Figure 25;

[0109] Figure 27: Illustration with mounted bridge from Figure 25;

[0110] Figure 28: Fire basket with grill attachment

[0111] Figure 29: Spacer of a grill attachment;

[0112] Figure 30: Section with grill attachment;

[0113] Figure 31 : Grill attachment;

[0114] Figure 32: Grill plate;

[0115] Figure 33: Bowl;

[0116] Figure 34: Fire basket;

[0117] Figure 35: Bowl;

[0118] Figure 36: Underside of the bowl from Figure 35; Figure 37: Top view of the top of a grill attachment with fire basket;

[0119] Figure 38: Top view of the underside of the grill attachment from Figure 37;

[0120] Figure 39: Bowl with tubular handle;

[0121] Figure 40: Fire basket with extendable legs;

[0122] Figure 41 : Section through a fire basket with extendable legs;

[0123] Figure 42: Legs with leg extensions;

[0124] Figure 43: Lid with opening;

[0125] Figure 44: Frame with heat-shielding wall.

[0126] Figure 1 shows a fire basket 1. The fire basket 1 may comprise an outer wall 2. The outer wall 2 may be shaped like part of a sphere, as shown in Figure 1. The fire basket 1 may comprise an inner wall 3. The outer wall 2 may be opposite the inner wall. Holes 4 may be provided at the upper edge of the inner wall 3. Heated air can flow through the holes 4 into a second combustion zone to combust difficult-to-ignite gases in the second combustion zone.

[0127] The fire basket 1 can have a fire basket attachment 5, which is placed on the outer wall 2 and / or the inner wall 3. The fire basket attachment 5 can taper towards the top. The fire basket attachment 5 can complete the outer shape of a sphere, i.e., be curved accordingly.

[0128] The fire basket 1 can comprise a frame 6 onto which the outer wall 2 can be loosely placed. The frame 6 can be manufactured by bending and welding at least one wire. The frame 6 can comprise a heat-shielding wall 7, i.e., a wall firmly connected to the rest of the frame. Alternatively, the heat-shielding wall 7 can simply be inserted. The heat-shielding wall 7 can be shaped at least substantially like a bowl. The heat-shielding wall 7 can be aligned substantially parallel to the ground such that the ground beneath the heat-shielding wall 7 is protected from heat. A frame with a heat-shielding wall 7 represents an independent invention that can also be used for other fire baskets. Figure 2 shows an example of a frame 6 with a heat-shielding wall 7 inserted therein.The heat-shielding wall 7 can be shaped similarly to a bowl, as shown. Hooks 8 can be provided on the outer edge. Using the hooks 8, the heat-shielding wall 7 can be hung or suspended from the frame.

[0129] Figure 3 shows a section through a fire basket as shown in Figures 1 and 2. It can be seen that the inner wall 3 is opposite the outer wall 2. A tray 9 can be inserted into the inner wall 3 of the fire basket 1. The tray 9 can be inserted loosely, so that simply lifting it is sufficient to remove the tray 9 from the inner wall 3. In this case, no connection needs to be loosened in order to remove the tray 9 from the inner wall 3. When inserted, the tray 9 can extend through the opening which forms the underside of the inner wall. The tray 9 can therefore be inserted into the inner wall 3 in such a way that a lower section of the tray 9 protrudes downwards opposite the inner wall 3, as shown in Figure 3.

[0130] The upper edge of the bowl 9 can be circular. The upper edge of the bowl 9 can rest on the inside of the inner wall 3, specifically in a curved area of ​​the inner wall 3. A grate 10 can be inserted into the bowl 9. The grate 10 can be inserted loosely, so that lifting it is sufficient to remove the grate 10 from the bowl 9. In this case, no connection needs to be removed to lift the grate 10. Combustible material such as wood can be placed on the grate 10 so that the wood can then be burned.

[0131] Above the grid 10, holes 11 can be provided in the tray. The holes 11 can be arranged in a ring shape. Air can flow through the holes 11 to the fuel. The top of the fuel placed on the grid 10 can thus be surrounded by air. The holes 11 in the tray 9 can be arranged such that they are surrounded by the inner wall 3, as shown in Figure 3, when the tray 9 is inserted into the inner wall 3.

[0132] Below the grate 10, for example, slot-shaped openings or, for example, oblong holes 12 can be provided in the tray 9. Air can flow into the tray 9 through the slot-shaped openings or, for example, oblong holes 12. The holes and / or openings 12 in the tray can be located at least partially below the inner wall 3 when the tray 9 is inserted into the inner wall 3. A cover 13 can be provided such that the slot-shaped openings or, for example, oblong holes 12 are covered so that ash cannot fall through the slot-shaped openings or, for example, oblong holes 12. Ash can then not fall out of the tray 9. Some of the air that flows into the tray 9 through the slot-shaped openings or, for example, oblong holes 12 can pass through the underside of the cover 13.This portion of the air can then flow from below through the grate 10, thus supplying air to the underside of the fuel placed on the grate. The other portion of the air, which flows into the bowl 9 through the slot-shaped openings or elongated holes 12, for example, can then flow to the openings or holes 11. The interior of the bowl 9 forms a first combustion zone in which wood and some of the resulting gases can burn.

[0133] To allow air to flow into the bowl 9, the underside of the inner wall 3 is open. An opening is thus formed at the underside of the inner wall 3. The distance a between this opening in the inner wall 3 and the holes 4 at the top of the inner wall 3 is, for example, at least 10 cm, so that difficult or more difficult to ignite gases produced during wood combustion can be reliably combusted in the upper combustion zone.

[0134] A rod-shaped handle 14 can be attached to the base of the bowl 9. The rod-shaped handle 14 can include a knob on its upper side to ensure a secure grip on the handle 14. The rod-shaped handle 14 can extend beyond the outer edge of the bowl 9 to allow easy gripping of the handle 14 even when the bowl 9 is well filled with ash.

[0135] The rod-shaped handle 14 can be made of a solid material.

[0136] The upper edge of the inner wall 3 can be bent outwards so that it rests on the outer edge of the outer wall 2. In a lower region of the outer wall 2, webs 15 and / or clamps, rivet nuts, or sleeves inserted into the webs can be provided. The webs 15 and / or clamps, rivet nuts, or sleeves can be fastened to the inside of the outer wall 2. The webs 15 and / or clamps, rivet nuts, or sleeves can, for example, be welded to the outer wall 2 and thus fastened. The webs 15 and / or clamps, rivet nuts, or sleeves can, for example, be screwed or riveted to the outer wall 2 and thus fastened. Threads can be provided or screwed into the inner end of the webs 15 and / or in the clamps, rivet nuts, or sleeves. The threads can extend vertically or essentially vertically upwards.A screw 16 can be screwed into each thread through an opening in the inner wall 3. This allows the inner wall 3 to be firmly connected to the outer wall 2. This form of fastening avoids thermal stresses that could damage the fastening between the inner wall 3 and the outer wall 2. Thermal stresses can therefore be compensated without causing damage. Webs 15 can be made from a sheet metal strip. Clamps, rivet nuts, or sleeves can be made of metal. Plastic is conceivable, but less suitable for thermal reasons.

[0137] The dimensions can be selected such that by screwing screws 16 into the corresponding threads, the inner wall 3 is clamped to the outer wall 2, so that the upper edge of the outer wall 2 is pulled slightly downward and thus pre-tensioned. Centering can also be achieved in this way.

[0138] The fire basket attachment 5 of the fire basket 1 can comprise a circumferential wall 17 and a projection 18 projecting inwards from the circumferential wall 17, for example a circumferential projection. The inner end of the projection

[0139] 18 can be tilted downward. The inner end of the projection 18 can extend into the inner wall 3. The fire basket attachment 5 can thus be securely held. Lifting the attachment 5 may then be sufficient to remove the fire basket attachment 5.

[0140] The outer wall 2 or the fire basket 1 can have a lower opening 19 on the underside through which air can flow into the fire basket 1. The fire basket 1 or the fire basket attachment 5 can be open on the top, i.e., have an upper opening 20 through which the previously flowed-in air can leave the fire basket 1, possibly together with smoke. Fuel can be filled into the fire basket through this opening 20. From the edge of the lower opening

[0141] A collar 21 may protrude upwards from the vent 19. The collar 19 can retain ash that has accidentally entered the area between the outer wall 2 and the inner wall 3.

[0142] The inner wall 3 can initially be cylindrical in an upper region. At this cylindrical region, the inner wall 3 can taper downwards and run in this region at approximately the same distance or the same distance and in this sense parallel to the outer wall 2. The outer wall 2 can be shaped almost entirely like part of a sphere. This allows air to flow particularly advantageously as follows, as indicated in Figure 4. Air first enters the fire basket 1 through the lower opening 19, as indicated by arrows 22. Air then flows along the outer wall 2. At the level of the slit-shaped openings or elongated holes 12, a portion of the air flowing into the fire basket 1 flows into the bowl 9, as indicated by arrows 23.This division of the air flow slows down the flow velocity of the portion of air flowing into the fire basket, which now reaches the particularly hot area of ​​the inner wall 3 as indicated by arrows 24. In addition, the flow velocity of the portion of air at the level of arrows 24 also slows down because the flow cross-section increases. The flow cross-section increases continuously because at the level of arrows 24 the diameter of the fire basket 1 increases towards the top without the distance between the inner wall 3 and the outer wall 2 changing or changing significantly. The slower flow velocity at the level of arrows 24 provides sufficient time to strongly heat the air indicated by arrows 24. This portion of the incoming air can therefore advantageously heat up to a strong degree due, among other things, to a relatively low flow velocity.

[0143] Highly heated air ultimately reaches the level of arrows 25. At the level of arrows 25, the distance between outer wall 2 and inner wall 3 decreases. In addition, the flow cross-section decreases continuously because the diameter of fire basket 1 decreases upwards at the level of arrows 25. The flow velocity of the air at the level of arrows 25 advantageously increases again continuously upwards in the direction of holes 4. In addition, the flow direction changes diagonally inwards, as indicated by the direction of arrows 25, so that air can flow at high speed through openings 4 into the upper second combustion zone. The one or more holes 4 present in the upper side of the inner wall 3 are located at the level of the upper quarter of the height of outer wall 2.Since the distance between the inner wall 3 and the outer wall 2 gradually decreases upwards at the level of the arrows 25 and the flow cross-section also gradually becomes smaller, disadvantageous air eddies are kept to a minimum. In the second combustion zone, the gases produced by wood combustion, which are difficult to ignite, can thus be combusted. Tests have shown that this combustion of difficult to ignite gases is supported by the fire basket attachment 5. Above the openings or holes 12, the air flow velocity initially decreases continuously and reaches a minimum. Thereafter, the air flow velocity increases continuously again in the direction of the holes 4. The continuously accelerated air finally passes through the holes 4.

[0144] The air that has flowed into the bowl 9 can flow out of the fire basket 1 along the arrows 27, i.e. through the inner wall 3 and then through the fire basket attachment 5.

[0145] Figure 5 shows a section of the fire basket 1. It can be seen that the upper edge 28 of the outer wall 2 can be bent inward in a partially circular cross-section. The upper edge 28 of the outer wall 2 can be mechanically stabilized in this way. The upper edge 29 of the inner wall 3 can extend outwards and diagonally upwards and rest on the upper edge 28 of the outer wall 2. If the inner wall 3 is now pulled downwards by the screws 16, the upper edge 28 of the outer wall 2 is pressed both downwards and outwards.

[0146] It can be seen that the circumferential wall 17 of the attachment 5 can, for example, rest on the upper edge 28 of the outer wall 2. Alternatively or additionally, the projection 18 can rest on the upper edge 29 of the inner wall 3.

[0147] Figure 6 shows a section of the fire basket 1. It can be seen that the grate 10 can have bars 30 in a first plane and bars 31 in a second plane below it. The bars 30 can, for example, run transversely to the bars 31. The upper edge 32 of the inserted bowl 9 can be bent in the shape of a partial circle in order to stabilize the upper edge 32 of the bowl 9. It can also be seen that the inclined cover 13 can have a collar 33 angled downwards from the cover 13. The collar 33 can further improve the effect of preventing ash from accidentally escaping from the bowl 9 through the slot-shaped openings or elongated holes 12. The collar 33 and the cover 13 can be made from a single piece, for example from a sheet metal such as sheet steel.It can be seen that a rivet nut or sleeve 15a is inserted into the end of the web 15 remote from the outer wall 2, into which a screw 16 is screwed.

[0148] Figure 7 shows a perspective view of the grid 10. It can be seen that the grid 10 can have a surrounding edge 34 in addition to the bars 30 and 31. The surrounding edge 34 can be ring-shaped. The surrounding edge 34 can protect against injuries and damage. Furthermore, the grid 10 can be mechanically stabilized by the surrounding edge. With the grid 10 shown in Figure 8, it is not necessary to pay attention to which way the grid is inserted into the tray 9. Basically, the grid 10 includes an opening in the center for the passage of a rod-shaped handle.

[0149] Figure 8 shows a perspective view of the bowl 9. With the exception of the holes 11 and / or the slot-shaped openings or oblong holes 12, for example, the bowl 9 may not have any further openings or holes on the outside. In particular, the bottom of the bowl 9 can be completely closed so that no ash can fall downwards out of the bowl 9. The wall section that borders the bottom of the bowl 9 and extends up to the slot-shaped openings or oblong holes 12, for example, can be completely closed to prevent ash from falling out. A support 35 for the grate 10 can be provided inside the bowl 9. The support 35 can be circumferential. The support 35 can be ring-shaped. The support 35 can have a flat surface on which the grate can be placed. The cover 13 can be attached to the support 35.The support 35 and the cover 13 can be made from a single piece, for example, from a sheet metal such as a steel sheet. The support 35, the collar 33, and the cover 13 can be made from a single piece, for example, from a sheet metal such as a steel sheet.

[0150] Figure 9 shows a perspective view of the fire basket attachment 5. The fire basket attachment 5 is particularly well suited for stamping an emblem 36, such as the lettering "höfats." Once stamped, the emblem is heat-resistant. Furthermore, a fire can be seen through the emblem, creating an additional visual effect.

[0151] Figure 10 shows that the fire basket 1 can comprise a tripod 37 onto which the outer wall 2 can be loosely placed. The tripod 37 can comprise three legs 38, which can be connected to one another, for example, by a joint 39. If a joint 39 is present, the legs can be pivoted into a transport position. In the transport position, the legs 38 run parallel to one another. The tripod 37 cannot comprise a heat-shielding wall because the distance between the outer wall 2 and a base can be relatively large. Figure 11 shows a section through the outer wall 2 and the inner wall 3. The underside of the inner wall 3 is essentially open and thus has a lower opening 40. The top side of the inner wall 3 is also open and has an upper opening 20.

[0152] The upper opening of the outer wall 2 is slightly larger than the upper opening 20 of the inner wall so that the edges 28 and 29 of the outer wall 2 and the inner wall 3 can be easily connected to one another. Figure 11 shows that the outer wall 2 can be shaped like part of a sphere. The part of the sphere can be larger than a hemisphere. The lower opening 19 of the outer wall 2 can be much smaller than the upper opening of the outer wall, since only air is intended to flow through the lower opening 19. The diameter of the upper opening of the outer wall 2 can be at least twice or at least three times as large as the diameter of the lower opening 19. The diameter of the sphere of the outer wall 2 can be greater than 40 cm or greater than 45 cm. The wall thickness of the outer wall 2 can be less than 2 mm or less than 1 mm. The wall thickness of the outer wall 2 can be at least 0.5 mm.The outer wall 2 can be at least 30 cm or at least 35 cm high. The outer wall 2 can be no higher than 70 cm or no higher than 60 cm.

[0153] The inner wall 3 can comprise an upper section 42, which can be cylindrical or frustoconical. If the upper section 42 is shaped like a truncated cone, the truncated cone tapers only slightly. A section 43 adjoining the upper section 42 downwards can be curved, for example parallel to the spherical shape of the outer wall 2. The underside of the inner wall 3 can comprise a stabilizing edge 41, which can be shaped like a perforated disc. The opening 40 on the underside of the inner wall 3 can be larger than the opening 19 on the underside of the outer wall 2 in order to be able to insert a sufficiently large shell 9 into the inner wall 3 partially through the opening 40. The distance between the inner wall 3 and the outer wall 2 can be at least 2 cm or at least 3 cm in the region of the section 43.The distance between the inner wall 3 and the outer wall 2 in the region of section 43 can be no more than 6 cm or no more than 5 cm. The inner wall 3 can, for example, be at least 10 cm or at least 15 cm high. The inner wall 3 can, for example, be no higher than 40 cm or no higher than 30 cm or no higher than 25 cm. The wall thickness of the inner wall 3 can be less than 2 mm or less than 1 mm. The wall thickness of the inner wall 3 can be greater than 0.5 mm. The wall thickness of the inner wall 3 can be greater than the wall thickness of the outer wall 2.

[0154] Figure 12 shows a design with elongated holes 4 in the inner wall 3, through which heated air can flow into the upper combustion zone. Particularly good combustion of difficult-to-ignite gases when burning wood can be achieved by suitable conditions.

[0155] The height b between the top of the grate 10 and the upper opening 20 of the fire basket 1 can therefore advantageously be less than the maximum diameter d of the inner wall 2. The ratio height b / diameter d can, for example, advantageously be greater than 0.5 or greater than 0.6 and / or less than 0.9 or less than 0.8.

[0156] The height of the inner wall 3 can be less than the maximum width d of the inner wall 3. The ratio of the height of the inner wall 3 / maximum width d can be between 0.3 and 0.7 or between 0.4 and 0.6 in order to be able to reliably ignite even difficult-to-ignite gases from wood combustion.

[0157] Advantageously, the area of ​​the opening 20 is smaller than the opening of the inner wall 2 at its upper side. Thus, the diameter c of, for example, the circular opening 20 and thus the area of ​​the opening 20 can be smaller than the diameter d of the upper circular opening of the inner wall 3 or the associated area. The ratio of diameter c to diameter d can, for example, be greater than 0.7 or greater than 0.8 and / or less than 0.95 or less than 0.9 in order to be able to ignite even difficult-to-ignite gases from wood combustion. The corresponding area ratio between the two openings can, for example, be between 0.5 and 0.9.

[0158] The opening 19 on the underside of the fire basket 1 can be significantly smaller than the opening on the top of the inner wall 3 in order to still be able to introduce sufficient air into the fire basket 1. The area of ​​the opening 19 on the underside of the fire basket can be four or five times smaller than the opening on the top of the inner wall 3. Both openings can be circular. In this case, the diameter d of the opening on the top of the inner wall 3 is correspondingly larger than the diameter of the opening 19 on the underside of the fire basket. The area of ​​the opening 19 on the underside of the fire basket can be at least 5% of the area of ​​the opening on the top of the inner wall 3 so that sufficient air can flow into the fire basket. The sum of the areas of the elongated holes 4 (i.e. the flow cross-sections) in the inner wall 3 can be significantly smaller than the sum of the areas of the openings 12 through which air can flow to the bowl 9.This advantageously allows significantly more air to flow into the shell 9 during operation than into the upper region of the inner wall 3, which is beneficial for the most complete combustion of wood. The ratio of the total area of ​​the elongated holes 4 in the inner wall 3 to the total area of ​​the openings 12 through which air can flow to the shell 9 can be at least 1.1 and / or not more than 2.1.

[0159] In Figure 12, e is the height of the outer wall 2. Figure 12 shows that the one or more holes 4 present at the top in the inner wall 3 are arranged at the level of the upper quarter e / 4 of the height of the outer wall 2.

[0160] Figure 13 shows that walls 2, 3 of the fire basket 1 can also be shaped differently so that the air flow velocity between the outer wall 2 and the inner wall 3 initially decreases, before then accelerating again toward the openings 4 in the inner wall 3. Curved shapes are not required. For example, the outer wall 2 can be shaped laterally similar to part of a rhombus in cross-section. The underside 44 of the outer wall 2 can be flat to prevent the fire basket 1 from being excessively high. Legs 45 for setting up the fire basket can be attached to the underside 44.

[0161] Figure 14 shows a perspective view of another embodiment of a grating 10. The cross-section of a bar or ring 46, 47, 48, 49, 50 of the grating 10 can be such that the cross-section widens from an outer side, i.e., top or bottom, of the grating 10 to the central plane of the grating. If the outer side of the grating 10 is the top side during operation, then the cross-section of the bar 46, 47, 48, 49, 50 widens downwards. If the outer side of the grating 10 is the bottom during operation, then the cross-section of the bar 46, 47, 48, 49, 50 widens upwards. In this way, a mechanically stable rod or ring 46, 47, 48, 49, 50 can be provided, which can taper towards the outside of the grid 10, for example, similar to a pitched roof, so that ash cannot accumulate on the rod or ring 46, 47, 48, 49, 50. The cross-section of the rods orRings 46, 47, 48, 49, 50 can therefore be shaped like a point on the outer sides of the grate 10. Such bars or rings 46, 47, 48, 49, 50 are shown in Figure 14. The cross-section of a bar or ring 46, 47, 48, 49, 50 of the grate 10 can be such that the cross-section widens from an outer side of the grate 10 to the central plane of the grate 10 in such a way that there are no surfaces parallel to the central plane of the grate 10 on which ash could accumulate. The cross-section can therefore widen in an arc or in a straight line from the outer side of the grate 10 to the central plane. Figure 14 shows the straight line of the widening towards the central plane.

[0162] The cross-section of a bar or ring 46, 47, 48, 49, 50 of the grate 10 can be mirror-symmetrical, so that there is no preferred direction for the grate 10 to be positioned. The central plane of the grate 10 can be the plane of symmetry. Regardless of which outer side of the grate 10 is at the bottom or at the top, the grate 10 always acts in the same way with respect to ash, which cannot or can only barely remain on bars or rings 46, 47, 48, 49, 50 of the grate shaped in this way. Ash can therefore slide down along the widened portion of the bars or rings 46, 47, 48, 49, 50 due to gravity during operation.

[0163] The cross-section of a bar or ring 46, 47, 48, 49, 50 of the grate 10 can, for example, be diamond-shaped or square. The cross-section of a bar or ring 46, 47, 48, 49, 50 of the grate 10 can be oval. However, cross-sections tapering towards the outside are preferable, as this allows ash to slide off particularly reliably and evenly.

[0164] A plurality of bars or rings 46, 47, 48, 49, 50, or all bars and rings 46, 47, 48, 49, 50 of the grid 10 can have identically shaped cross-sections. However, the thickness and / or width of the bars or rings 46, 47, 48, 49, 50 can differ, for example, for stability reasons. It is possible that one or more bars or rings 47 that define the outside of the grid 10 have a greater height than other bars or rings 46, 48, 49, 50 of the grid 10. This can ensure that fuel can be better held on the grid 10. One or more bars or rings 47 that define the outside of the grid can, for example, be straight, curved, or ring-shaped. Figure 14 shows a ring 47 that defines the outer boundary of the grid 10. Several bars can also be combined to form a polygon that extends similarly to the ring 47.

[0165] Bars 48 can be omitted to avoid stress peaks. For this reason, there can be exactly three bars 49. Bars 48, 49, and all other profiles of the lattice can have a round cross-section to avoid stress peaks.

[0166] A plurality of rings 46, 47, 50, 50a of the grid can be arranged concentrically. Concentric rings 46, 47, 50, 50a of the grid 10 can be equally spaced from one another, as shown in Figure 14. The distances between two adjacent concentric rings 46, 47, 50, 50a of the grid 10 are then always the same. Fuel can then be evenly distributed on the grid.

[0167] For stability reasons, one or more inner rings 50, 50a of the grid can be larger than other bars and / or rings 46, 48, 49 of the grid 10, i.e., thicker and / or wider. Such a ring 50 can, for example, extend in a ring shape around the center of the grid 10, as seen in a top view of the grid 10.

[0168] Concentrically extending rings 46, 47, 50 of the grid 10 can be connected to one another by bars 48, 49 that run transversely thereto. Transverse bars 48, 49 can project outward in a star shape, for example, starting from a ring 50 to which transverse bars 48, 49 can be connected. To prevent passages of the grid 10 adjacent to the outer side of the inner ring 50 from becoming too small, only some transverse bars 49 can be connected to the inner ring 50, for example, only every second transverse bar 49. Other transverse bars 48 can be connected to another, for example, adjacent, ring 50a.

[0169] Transverse bars 48, 49 of the grid can be equally spaced. The distances between two adjacent transverse bars 48, 49 of the grid are then always the same.

[0170] Exactly three transverse bars 49 can protrude outward so that they can serve as a wobble-free three-point support. Ends 51 of these transverse bars 49 can thus protrude from an edge bar 47. The ends 51 then form supports on which the grate 10 can be placed within the fire basket 1.

[0171] The transition between bars and rings 46, 48 may be rectangular. However, a rounded transition 52, as shown in Figure 14, is preferable. Tests have shown that the grid 10 can then better withstand thermal stresses. The grid 10 shown in Figure 14 may, for example, have been manufactured by a casting process, such as die casting or sand casting.

[0172] Figure 15 shows preferred cross-sections 53, 53a of bars or rings 46, 47. The cross-sections 53, 53a of the bars or rings 46, 47 can be identically shaped and can initially widen in a pointed roof shape from the outside to the central plane 54 of the grid 10, as shown in Figure 15. The pointed roof-shaped widenings can lead to parallel sides or to sides with demolding slopes, as shown in Figure 15. The demolding slopes can then end at the central plane 54, from which demolding then takes place. No ash can remain on such a bar or ring 46, 47. Furthermore, the bar or ring 46, 47 is very stable.

[0173] The height and width of the cross section 53a of the outer rod or ring 47 can, as shown in Figure 15, be greater than the height and width of the cross sections 53 of the rods or rings 46.

[0174] There may be equal distances 55 between the bars or rings 46 and 47, as shown in Figure 15.

[0175] Figure 16 shows an enlarged top view of a rounded transition 52 between two rods / rings 46 and 48, which is preferable for thermal reasons.

[0176] Figure 17 shows a frame 56 that can comprise a ring element 57. The ring element 57 can be circular, as shown in Figure 17. However, it is also possible for the ring element 57 to be a polygon, for example. The upper side 58 of the ring element 57 can be concavely curved in order to securely hold a corresponding, convexly curved underside of the fire basket 1. The curvature of the upper side 58 of the ring element 57 can be curved like a sphere, in particular if the convexly curved underside of the fire basket 1 is also curved like a corresponding sphere. The radius of the curvature of the ring element 57 can then correspond to the radius of the curvature of the underside of the fire basket 1, so that the underside of the fire basket 1 can be held securely and flatly by the ring element 57.The radius of the curvature of the ring element 57 can only approximately match the radius of the curvature of the underside of the fire basket 1, so that the underside of the fire basket 1 cannot be held flat by the ring element 57. Although the ring element 57 does not directly contribute to holding the fire basket, it is advantageous that the ring element 57 does not protrude excessively far downwards from the fire basket.

[0177] The frame 56 can comprise legs 59, for example exactly three legs 59 for wobble-free installation. The legs 59 can be evenly distributed and attached to the ring element 57. The legs 59 can be formed from profiles, for example U-profiles, T-profiles, or H-profiles, so that the legs 59 are stable yet lightweight. In the case of Figure 17, the legs are formed almost entirely from U-profiles with legs 60, which is preferable for cleaning reasons. The height of the legs 60 can, as shown in Figure 17, decrease towards the bottom so that the lower end 61 of the legs 59 can be narrow in order to set up the frame 56 easily and reliably without wobble. The lower end 61 of the legs 59 can be rounded, as shown in Figure 17, in order to set up easily and reliably without wobble.The lower end 61 can be rounded in several spatial directions to reliably prevent legs 59 from being placed on easily damaged edges. Viewed from the ring element 57, the legs 59 can project obliquely outward, as shown in Figure 17, in order to increase the installation surface for reasons of stability. This also makes it easier to grasp a leg 59 of the frame 56 placed on a surface in order to handle the frame 56.

[0178] Each leg 59 can be shaped like an L, i.e., have a long leg 62 and a short leg 63 connected to it at an angle. The short leg 63 can be attached to the ring element 57. This allows the support surface for the fire basket 1 to be enlarged without having to provide a ring element 47 with a large diameter.

[0179] The outer side of a short leg 63 can be concavely curved so that a correspondingly curved underside of the fire basket 1 can rest flat on the short leg 63 for support. The underside of the fire basket 1 can rest flat on the short legs 63 of the legs 59. However, the underside of the fire basket 1 can also only rest on the outside on the short legs 63 of the legs 59. If only three legs 59 are present, the three legs 63 ensure a wobble-free three-point support for the fire basket 1. For manufacturing tolerances, it is advantageous that the curvature of the contact surface between the legs 63 and the fire basket 1 is not identical. If the curvature of a leg 63 is slightly smaller, a wobble-free three-point support is achieved. This means that the fire bowl 1 rests on the short legs 63 at only three points. Are the legs 59 not excessively long orIn short, the frame 56 can be manufactured in one piece in a single step, without any problems, for example, by a casting process such as die casting or sand casting, in a technically particularly simple manner. Such a one-piece production is particularly possible if the height of the frame 56 is smaller than the maximum diameter of the frame 56. Such a frame is shown in Figure 17. If the frame 56 does not have excessively long legs, the height of the frame 56 can be smaller than the height of the fire basket 1.

[0180] If a frame 56 with longer legs 59 is desired, at least the ring element 57 can be manufactured together with the short legs 63 in a single step, for example by casting, such as die casting or sand casting. The long legs 62 can then be attached to the short legs 63, for example by means of screws or welding. In this way, a suitable frame 56 with long legs 59 can still be manufactured in a technically simple manner.

[0181] If the legs 59 are longer in this sense, then the height of the frame 56 can be greater than the height of the fire basket 1.

[0182] A frame 56 may be made of a metal, such as steel. One or more protective coatings and / or coatings may be applied to the surface of the frame 56 after manufacture. A protective coating may be formed, for example, from enamel or powder coating.

[0183] Figure 18 shows a section of a fire basket with a grate 10, as shown in Figure 14, and a frame, as shown in Figure 17. Figure 18 shows that the underside of the fire basket can only rest on the outside of the legs 63. Three legs 63 ensure a wobble-free hold.

[0184] The shell 9 can have a few retaining holes 64 above the holes 11 for holding a wood pellet attachment. The retaining holes 64 can be evenly distributed at the same height. The wood pellet attachment can have pins that can extend into holes 64 to stabilize the position of the wood pellet attachment. One retaining hole 64 can be provided for the passage of a thread to attach the wood pellet attachment to the shell 9 by means of a screw connection.

[0185] In order to particularly suitably attach a web 15, it can have a foot 65 whose shape is adapted to the inside of the outer wall 2. The foot, adapted to the inside, ensures even load distribution. The foot 65 can be a few centimeters long, for example at least 2 cm or at least 3 cm long. One or more tabs 66 can be bent along the underside of the foot 65 and are attached to the inside of the outer wall, for example by soldering or welding. Several tabs 66 are preferable in order to avoid excessive stress on the outer wall in some places, also with regard to the attachment. The remaining part of the web 15 can protrude upwards from the foot 65, namely vertically upwards when the fire basket is set up as intended. A reinforcement 67 for receiving the screw 16 can be provided, which can be located above the inner wall 3.

[0186] The handle 14 can be secured to the base of the shell 9 by a screw 68. One or two washers 69 can stabilize this attachment of the handle 14.

[0187] Figure 18 illustrates that shell 9 and cover 13 can be joined together by shaped elements 33 and 12 to create a kind of labyrinth seal. Ash would have to travel the back-and-forth curved path 70 to be able to leave shell 9. This is a difficult obstacle for ash to overcome.

[0188] Figure 19 shows a fire basket 1 with a frame 56. Unlike the frame 56 in Figure 17, this frame 56 has long legs, so that the frame 56 cannot be manufactured in one piece in a single step (except for optional coatings). The height HG of the frame 56 is slightly greater than the height HK of the fire basket 1. The height HG of the frame 56 is greater than the maximum diameter of the frame 56.

[0189] Figure 20 shows a section through a fire basket 1 with a wood pellet attachment 71. The wood pellet attachment 71 increases the volume of the bowl 9 to accommodate fuel and fuel residues, which can occur more frequently with pellets. The wood pellet attachment 71 prevents free-flowing fuel such as wood pellets from undesirably remaining on the upper edge of the bowl 9 and / or fuel residues from unexpectedly trickling out above the grate 10. The wood pellet attachment 71 can taper downwards. The wood pellet attachment 71 can taper downwards, for example in a cone shape. The wood pellet attachment 71 can have a first section 72 which tapers downwards, for example in a cone shape. The wood pellet attachment 71 may have a second section 73 which tapers downwards more sharply than the first section 72. The second section 73 may also taper in a conical shape.The maximum outer diameter of the wood pellet attachment 71 can be slightly smaller than the maximum inner diameter of the inner wall 3 so that the wood pellet attachment 71 can rest against the inner wall 3. The underside of the wood pellet attachment 71 can be connected to the bowl 9, for example by means of screw connections 74. For stabilization reasons, the wood pellet attachment 71 can have an outwardly curved edge 75 on its upper side, which can rest against the inside of the inner wall 3. Using the handle 14, the bowl 9 and the attached wood pellet attachment 71 can be removed from the fire basket 1, for example to fill it with wood pellets or to empty out burnt ash.

[0190] Figures 21 and 22 show a bowl 9 with a wood pellet attachment 71 and a lifting tool 76. The lifting tool 76 can be detachably connected, for example, to a knob 78 of the handle 14. For this purpose, the lifting tool 76 can comprise claws 77 into which the knob 78 can be hooked. With the help of the lifting tool 76, the bowl 9, optionally together with the wood pellet attachment 71, can then be lifted out of the fire basket 1 without having to fear burns. The lifting tool 76 can, for example, be pivotally connected to the handle 14 or the knob 78 of the handle 14 in order to be able to pivot the bowl 9 for emptying while the lifting tool 76 is held. Pivoting is shown in Figure 22.

[0191] The tray 9 may have a discharge opening 81 on its underside, which may be bounded laterally by a wall 82. Ash can fall out of the tray 9 through the discharge opening 81 by tilting the tray 9. However, particularly in the case of wood pellets, it can also be discharged through the opening on the top.

[0192] The lifting tool 76 may have a lifting tool handle 79 on its top side in order to hold the lifting tool 76 safely and ergonomically.

[0193] The claws 77 can be bent into a U-shape. Two such claws 77 can be arranged side by side. For example, the knob 78 can then be pivoted between the two claws 77, coming from above.

[0194] Figure 23 shows a section through a fire basket with a double-walled fire basket attachment 5 to further improve combustion. In addition to the circumferential outer wall 17, the fire basket attachment 5 can comprise an inner wall 80, 81. The inner wall can comprise an upper wall section 80 and a lower wall section 81. The two wall sections 80 and 81 can enclose an angle which can be, for example, at least 80°, or at least 90°, or at least 95°. The angle can be less than 120°, or less than 110°, or less than 105°. The lower wall section 81 can, for example, be connected to the circumferential projection 18 of the fire basket attachment 5. The lower wall section 81 can protrude inward so that heat can build up above the openings 4 at the top in the inner wall 3 for improved combustion.When the fire basket 1 is set up as intended, the lower wall section 81 can be slightly inclined upward to promote airflow out of the fire basket 1 and thereby further improve combustion. The upper wall section 80 can, for example, run parallel to the upper section of the inner wall 3. When the fire basket 1 is set up as intended, the upper wall section 80 can, for example, run vertically or at least approximately vertically.

[0195] The double wall of the fire basket attachment 5 can be circumferential, i.e., ring-shaped when viewed from above. The fire basket attachment 5 does not have to be completely double-walled. The fire basket attachment 5 can also be only partially double-walled, i.e., comprise a double wall.

[0196] Walls 17, 18, 80, 81 of the fire basket attachment 5 can enclose a hollow space so that the heat is intensified near the openings 4 at the top in the inner wall (3), i.e., adjacent to the upper second combustion zone, to improve combustion, while the fire basket attachment 5 remains comparatively cool on the outside. Opposite a punched-out emblem 38, the inner wall 80, 81 can include a cutout 82 so that the light from the fire can be seen through the punched-out emblem 36.

[0197] A double-walled fire basket attachment 5 also has the advantage that the upper edge of the fire basket attachment 5 can be particularly mechanically stable. The upper edge of the fire basket attachment 5 is then particularly well suited for, for example, placing a grill attachment on the upper edge of the fire basket attachment 5 without having to worry about stability problems. A double-walled fire basket attachment 5 can also counteract discoloration on the outside of the fire basket attachment. Figure 24 shows a section through a fire basket 1 with a spark guard 83 and a lid 84. The spark guard is an air-permeable grid or an air-permeable wire mesh, or comprises an air-permeable grid or an air-permeable wire mesh so that air exchange is possible. The spark guard can be attached during combustion as shown in Figure 24 and protects against flying sparks.The spark guard 83 can be partially spherical. The radius of the spark guard 83 can correspond to the radius of the outer wall 2. The spark guard 83 can be reinforced at the edges, for example, by folding over the grid or wire mesh or by adding a separate additional ring. The spark guard 83 can be made of metal.

[0198] The cover 84 can also be partially spherical. The cover 84 can have a smaller radius than the spark arrestor so that the cover 84 can be easily attached together with the spark arrestor 83, as shown in Figure 24. The cover 84 can be made of metal. The cover 84 can be reinforced at the edges, for example by forming a partially circular shape inwards. A web 15, with which the inner wall 3 and the outer wall 2 can be braced, can be machined from a sheet metal, for example by cutting, punching, drilling and / or forming. Such a web 15 can, as shown in Figure 25, be formed predominantly by a strip, which can be divided into segments 85, 87 by forming. The segments 85 can be approximately continuous, i.e., form an approximately arcuate section 86, or can be completely arcuate.The segments 85 can in particular be approximately part-circular, i.e. form approximately a part-circular section 86.

[0199] The radius of such an arcuate section 86 can be adapted to the radius of the arcuate shape of the outer wall 2, as shown in section in Figure 26. The radius of such an arcuate section 86 of the web 15 can be somewhat smaller than the radius of the arcuate shape of the outer wall 2. This can be achieved by having the arcuate section 86 of the web 15 pressed completely or partially against the outer wall 2, whereby the web 15 can be stabilized. This can keep the material expenditure for the web 15 to a minimum. Preferably, at least an upper third or at least an upper half of the arcuate section 86 of the web 15 rests on the inside of the outer wall 2 for reasons of stabilization. Preferably, at least 70% or at least 80% or at least 90% of the web 15 rests on the inside of the outer wall 2 for reasons of stabilization.If the arcuate section 86 is formed by segments 85, then it is sufficient that the arcuate section 86 rests against the outer wall 2 only at transitions from one segment 85 to the next segment 85.

[0200] The curved section 86 may also be completely curved, i.e., not divided into segments 85. The curved section 86 may have been produced by forming.

[0201] A segment 87 may be present which, when mounted, protrudes inward from the outer wall 2. The segment 87 may protrude diagonally downward from the outer wall, as shown in section in Figure 26. Such a segment 87 can, in particular, create a prestress. The web 15 can then be in a prestressed state with the aid of the segment 87 when the web 15 is mounted in the fire basket 1.

[0202] Bracing between the inner wall 3 and the outer wall 2 is preferably achieved by means of a web 15, which is connected at both ends of the web by positive locking to the inner wall 3 and the outer wall 2. The web 15 is then, in particular, not firmly bonded to the inner wall 3 and the outer wall 2. Thus, for example, there is no welded joint, which is disadvantageous from a manufacturing point of view, connecting the web 15 to the inner wall 3 and / or the outer wall 2. This allows the manufacturing effort to be kept particularly low.

[0203] In order to connect a web 15 to a wall 2, 3 by means of a positive fit, the web 15 can have a section 90 with a hole 91, as shown in Figure 25. The section 90 can be located, for example, at the lower end of the web 15 in order to connect this section 90 to the inner wall 3, for example by means of a screw connection. The section 90 can protrude laterally on both sides compared to the remaining part of the web in order to be able to effectively secure it against twisting. The section 90 can be connected to the web 87, which, in the assembled state, protrudes inwards from the outer wall 2. The section 90 can have one or two locking elements which can prevent the section 90 from being twisted, for example when the section 90 is connected to the inner wall 3 by means of a screw connection.A securing element can be a tongue 92 projecting upwardly or downwardly, as shown in Figure 25. In order to connect a web 15 to at least one wall 2, 3 by positive engagement, the web 15 can have a tab 88 as a spacer element. The tab 88 can be located at the upper end of the web 15. In the assembled state, the free end of the tab 88 can be pressed against the inner wall 3 in order to center the inner wall 3 and / or to adjust the position of the web 15 at the upper edge of the outer wall 2 or the inner wall 3. This is shown in Figure 26.

[0204] In order to connect a web 15 to at least one wall 2, 3 by positive engagement, the web 15 can have an upper end that extends into, for example, a bent upper edge 28 of the outer wall 2 and / or is pressed in for bracing. The upper end can be formed by two prongs 89, as shown in Figure 25. The tab 88 can end between the two prongs 89.

[0205] The tab 88 ensures that during assembly the upper end 89 of the web 15 is pressed into the upper edge 28 of the outer wall 2 and not pushed into an area between the inner wall 3 and the outer wall 2. The web 87, which projects inwards from the outer wall 2 in the assembled state, can be used to press the upper end 89 of the web 15 into the upper edge 28 of the outer wall 2 by spring force, which further facilitates assembly. The pressing in can be achieved by screwing the lower end of the web to the inner wall 3 using a screw 16 (see Figure 26). This can also press an arcuate section 86 of the web 15 at least partially against the outer wall 2 in order to stabilize the web 15.

[0206] Figure 27 shows how such a web 15 can be positively connected to the inner wall 3. The inner wall 3 can have a lower edge 93 that can be bent inwards. For stability reasons, the lower edge can run within a single plane, i.e., be shaped like an annular disk, as shown in Figure 27. The lower edge 93 can have a hole through which a screw 16 of a screw connection extends. The screw 16 then also passes through the hole 91 of the web 15. The screw connection can comprise a nut 94 for the connection, which is screwed onto the opposite side, as shown in Figure 27. This can be a pull-in nut 94. Preferably, exactly three webs 15 are provided in order to create a type of three-point support. However, only two webs 15 or four webs 15 can also be provided. More than four webs 15 may be provided.Webs 15 can have equal distances between each other.

[0207] The lower edge 93 may have additional holes 95. The holes may be elongated holes 95 that may run parallel to the lower edge 93. A locking element 92 may extend into a hole 95 to secure the section 90 against twisting.

[0208] A grill attachment 96, as shown in Figure 28, can be provided for the fire basket 1 and can be placed on the upper edge of the fire basket 1. The grill attachment 96 can comprise a grill plate 97, which can be shaped like a ring disk or at least similar to a ring disk. The diameter of the grill plate 97, when viewed from above the fire basket 1, can be larger than the diameter of the fire basket 1. The grill plate 97 can therefore protrude laterally from the fire basket in order to provide a large grilling surface. The grill plate 97 can indeed be placed directly on top of the fire basket 1, for example, on the upper edge of the fire basket attachment 5. However, this is disadvantageous, for example because the grill plate 97 can then only be heated very unevenly by a fire and / or the fire can be extinguished. It is therefore preferable for the grill attachment 96 to comprise a spacer 98 on which the grill plate 97 can be located.

[0209] The spacer 98 can be permanently connected to the grill plate 97. However, it is preferable that the grill plate 97 can be placed on the spacer 98. This has the advantage, among other things, that instead of a grill plate, a pan, a wok, or a cooking pot, for example, can be placed on the spacer 98.

[0210] The grill plate 97 can be releasably attached to the spacer in such a way that it is then secured against lateral displacement.

[0211] The spacer 98 can be height-adjustable so that a distance between the top of the fire basket 1 and the grill plate 97 can be set.

[0212] The spacer 98 can be attached to the top of the fire basket 1 with feet 99, preferably with exactly three feet 99. The feet 99 allow flames to pass through the feet towards the outer edge of the grill plate 97 in order to heat the grill plate. The feet 99 can be attached directly to the grill plate. The feet 99 can be adjustable so that the distance between the top of the fire basket 1 and the grill plate 97 can be changed. The feet 99 can, for example, comprise bolts that can be screwed in from the side. The bolts can rest on an upper edge of the top of the fire basket 1. If the bolts of each foot can be screwed in at different heights, then a desired distance between the top of the fire basket 1 and the grill plate 97 can be set.Conversely, the bolts can also be designed to allow the grill plate to be placed on them, which also allows a desired distance to be set between the top of the fire basket 1 and the grill plate 97. This principle is known from the German patent application with the official file number 102023200816.5.

[0213] The spacer 98 can comprise a ring 100 to which the feet 99 can be attached. The ring 100 can also advantageously create a chimney effect. The grill plate 97 can be placed directly or indirectly on the ring 98.

[0214] The diameter of the ring 100 may correspond to the diameter of the upper edge of the fire basket 1. The diameter of the ring 100 may be smaller than the diameter of the grill plate, as shown in Figure 28.

[0215] The diameter of the grill plate may be at least 20% or at least 30% larger than the diameter of the ring 100 in order to achieve good heat distribution and to protect a user from flames.

[0216] Second feet or an upper section 101 of the feet 99 can be provided above the ring 100. The grill plate 97 can be placed on the second feet or the upper section 101 of the feet 99. Flames of a fire can then be directed through the second feet or the upper section 101 of the feet 99 to a central, annular region of the grill plate in order to further improve the uniform heating of the grill plate 97. Flames can thus be distributed particularly favorably by the first feet 99 and the second feet or upper sections 101 of the feet 99 in order to heat a grill plate 97 evenly.

[0217] If second feet are provided, the second feet can alternatively or additionally be height-adjustable to adjust the distance between the top of the fire basket 1 and the grill plate 97. The spacer 98 can consist of several parts to adjust the distance between the top of the fire basket 1 and the grill plate 97 by adding or removing parts.

[0218] The spacer 98 may consist of one part and may be manufactured, for example, by metal casting in one work step.

[0219] Figure 29 shows a spacer 98 of a grill attachment 96. Feet 99 of the spacer 98 can have a step 102 on their underside to enable the feet to be placed on an uppermost edge of the fire basket 1 in such a way that the feet 99, and thus the grill attachment 96, are secured against lateral displacement. The downwardly projecting part of the step 102 can then rest laterally on an uppermost edge of the fire basket 1 to counteract lateral displacement. This is illustrated in Figure 30. The part of the step 102 projecting horizontally therefrom can then rest on an uppermost edge of the fire basket 1. This is shown in Figure 30.

[0220] The ring 100 may have a T-shaped cross-section in order to mechanically stabilize the ring 100 with little material expenditure, as can be seen in Figure 29.

[0221] Figure 29 illustrates that the feet 29 can have an upper section 101 that can project upwards from the ring 100. The upper section 101 or alternatively second feet can have elongated supports 103 that can project inwards, as shown in Figure 29. This allows pots and pans to be placed thereon even if the diameter of the pots and pans is small. The supports 103 can lie in one plane to provide a plane-parallel support for pots and pans. The supports 103 can slope slightly downwards from the outside to the inside to secure pots and pans against lateral displacement. An upper side of a foot 99 can be partially circular in section to create a linear support 103. However, a support 103 can also be flat.

[0222] The elongated supports 103 can be designed such that a pot with a diameter of 100 mm, 150 mm, 170 mm, or 180 mm can be placed on the supports 103. The elongated supports 103 can be at least 30 mm, 50 mm, 70 mm, or 90 mm long. The elongated supports 103 can protrude perpendicularly from the ring 100 when viewed from above. The inner sides 104 of the feet 99 can be curved, as shown in Figure 29, in order to stabilize the supports 103 with minimal material expenditure.

[0223] The feet 99 may be at least 20 mm, or at least 30 mm, or at least 50 mm high. The feet 99 may not be more than 100 mm or more than 80 mm high.

[0224] The ring 100 may have an outer diameter of at least 100 mm, or at least 250 mm, or at least 300 mm. The ring 100 may have an outer diameter of not more than 800 mm, or not more than 500 mm, or not more than 400 mm.

[0225] The annular gaps 105 below the ring 100 can be higher (or wider) than the annular gaps 106 above the ring 100 in order to heat a grill plate 97 particularly evenly, as can be clearly seen in Figure 30. The height of the sections of the feet 99 below the ring 100 is then greater than the height of the sections 101 or of second feet above the ring 100. The height of the sections or second feet above the ring 100 can, for example, be less than 20 mm or less than 15 mm. The height of the sections 101 below the ring can, for example, be greater than 15 mm if the height of the sections 101 is less than 15 mm. The height of the sections 101 or the height of second feet above the ring 100 can be such that a gap 106 with a height of 8 mm to 12 mm remains between the ring 100 and the underside of a grill plate 97.The height of the sections below the ring 100 can be such that a gap 105 with a height of 15 mm to 25 mm remains between the ring 100 and the top of the fire basket 1.

[0226] The annular gaps 105 below the ring 100 can be at least 1.5 times as high or at least 2 times as high as the annular gaps 106 above the ring 100 in order to heat a grill plate 97 particularly evenly. The annular gaps 105 below the ring 100 can be no more than 3 times as high or no more than 2.5 times as high as the annular gaps 106 above the ring 100 in order to heat a grill plate 97 particularly evenly.

[0227] To secure the grill plate 97 against lateral displacement, rings 107 and 108 can protrude downward from the underside of the grill plate 97. A support 103 can extend from the inside of one ring 107 to the outside of the other ring 108 in order to secure the grill plate 97 against displacement. Providing rings 107 and 108 instead of other shaped anti-displacement elements has the advantage that no, or at least hardly, attention needs to be paid to a particular orientation in the direction of rotation when placing the grill plate 97 on it, and / or that the grill plate 97 is mechanically stabilized.

[0228] The area near the outer edge 109 of the grill plate 97 can be shaped similarly to a T in order to stabilize the grill plate with minimal material expenditure. The upwardly projecting part of the T-shape also prevents liquid from undesirably draining outward.

[0229] Figure 31 shows a further view of a grill attachment 96. The top side 110 of the grill plate 97 can run slightly downwards from the outside to the inside towards an opening 111 so that liquid can drain inwards, as is also indicated in Figure 30. An exchange of gases can also take place through the opening 111 to support combustion. The diameter of the opening 111 of the grill plate 97 can be smaller than the diameter of the opening on the top side of the fire basket 1 in order to be able to heat the grill plate 97 evenly, as can also be seen in Figure 30. The diameter of the opening on the top side of the fire basket 1 can be at least 1.5 times the diameter of the opening 111 of the grill plate in order to be able to heat the grill plate 97 evenly.The diameter of the opening at the top of the fire basket 1 may not be more than 2.5 times the diameter of the opening 111 of the grill plate to ensure even heating of the grill plate 97. The outer edge 109 of the grill plate 97 may be circular. The opening 111 may be circular. The opening at the top of the fire basket may be the upper opening of the fire basket attachment.

[0230] Figure 32 shows an underside of the grill plate 97. For stabilization, transverse webs 112 and 113 can be provided on the underside, which can protrude perpendicularly from the outer edge 109. First transverse webs 112 can only run from the outer edge 109 to an outer ring 107 so as not to hinder placement of the grill plate. Second transverse webs 113 can run to an inner ring. So that the second transverse webs 113 do not excessively hinder placement on supports 103, the number of these second transverse webs 113 can be fewer than the number of first transverse webs 112, which only run to the outer ring 107. For example, there can be no more than three or no more than four second transverse webs 113 extending from the outside to the inner ring 108 of the grill plate 97. For example, there may be more than three or more than five first transverse webs 112 extending from the outside to the outer ring 107 of the grill plate 97.

[0231] The grill plate 97 can, for example, be manufactured in one piece in a single step. The grill plate 97 can be made of metal, for example, by a metal casting process.

[0232] Figure 33 shows a shell 9 in a sectional view, which can be composed of an upper shell part 114 and a lower shell part 114. The upper shell part 114 can have a conical or curved side wall 116 that tapers downwards. The side wall 116 can open into an annular disk 117. The upper shell part 114 can be firmly connected to the lower shell part 115 by one or more screw connections 118 and / or one or more rivet connections or in some other way. The one or more screw connections 118 and / or the one or more rivet connections can be passed through the annular disk 117 of the upper shell part. The lower shell part 115 can, for example, have one or more outwardly projecting tabs. A screw connection 118 or a rivet connection for fastening can be passed through a tab, as can be seen in Figure 33.

[0233] A grate 10 can be connected in one piece to the upper shell part 114. The grate 10 can be manufactured with the upper shell part 114 in a single work step and thus consist of a single piece. The shell part 114 and the grate 10 can be produced from a sheet metal, for example by forming, punching, and / or drilling. The grate 10 can be curved upwards towards the center to ensure stability with minimal material expenditure. The grate 10 is then curved upwards when the fire basket 1 is in its intended position. The grate 10 can terminate in the inner edge of the annular disc 117. The grate 10 can be perforated, as can be seen in Figure 33.

[0234] Due to the height of the upper shell part 114, the bowl 9 can be significantly taller than the bowl 9 previously shown in figures, such as in Figure 8. A large quantity of wood pellets can then be filled into the bowl 9 without requiring an additional wood pellet attachment 71. This makes it possible to burn wood pellets for more than an hour without having to refill with wood pellets or other fuel. In order to provide a sufficiently large volume for wood pellets compared to the volume for the resulting wood pellet ash, the upper shell part 114 can have a larger diameter throughout compared to the diameters of the lower shell half 115. The smallest diameter of the upper shell part 114 is then larger than the largest diameter of the lower shell part 115.In order to be able to provide a sufficiently large volume for wood pellets in comparison to a volume for the wood pellet ash that then arises, the height h1 of the upper shell part 114 can exceed the height h2 of the lower shell part 115 by at least 1.3 times or at least 1.5 times or at least 1.8 times. In this case, h1 > 1.3 * h2 or h1 > 1.5 * h2 or h1 > 1.8 * h2 applies. In order to be able to provide a sufficiently large volume for the wood pellet ash that then arises, the height h1 of the upper shell part 114 can no longer be four times or no more than three times the height h2 of the lower shell part 115. In this case, h1 < 4 * h2 or h1 < 3 * h2 applies.

[0235] Holes 11 of the shell 9 can then be present in the lower half of the upper shell part 114.

[0236] The lower shell part 115 can taper inwardly and downwardly in an arcuate manner to facilitate the insertion of the shell 9. The bottom 119 of the lower shell part 115 can be flat to allow the shell 9 to be placed securely on a surface.

[0237] A handle 14 of the bowl 9 can be attached, for example, to the base of the lower bowl part 115 by a screw 120. The base of the lower bowl part 115 can have an upwardly projecting recess 121 for the screw 120 so that the screw does not protrude from the base 119 and does not adversely affect the positioning of the bowl 9.

[0238] If the bowl 9 can be placed securely on a surface without any problems, a set comprising the fire basket 1 and a second bowl 9 is particularly advantageous. If necessary, the set can then include one or two wood pellet attachments 71. If there is a need to refill with fuel, such as wood pellets, the first bowl 9 in use can be exchanged for the second bowl 9 already filled with fuel. This allows the fire basket to operate almost seamlessly for several hours. Any glowing ash in the first bowl can then remain in the first bowl 9 until there are no more embers and the ash has cooled down sufficiently. In this way, the fire basket 1 can be operated for many hours, especially when using wood pellets. The first replacement of the bowls 9 may only be necessary after one or two hours. It is therefore possible to dimension the fire basket 1 accordingly.In particular, this can be achieved with a fire basket that includes the dimensions described above.

[0239] The handle 14 can end only slightly above the upper side edge of the shell 9 shown in Figure 33.

[0240] A bowl 9 with a grate 10 manufactured in one piece with an upper bowl part 114 is preferable for manufacturing reasons. For manufacturing reasons, it is also preferable that the height of the upper bowl part 114 be adjusted to accommodate a larger quantity of wood pellets without requiring an additional wood pellet attachment, so that refilling with wood pellets or other fuel is avoided for at least one hour.

[0241] Figure 34 shows a further embodiment of a fire basket 1 in a sectional view, which combines previously described embodiments. Details are evident, among other things, from the reference numerals.

[0242] Figure 35 shows a sectional view of further features that a tray 9 can comprise. A special feature can be that the parts of this tray 9 can be firmly connected to one another by means of a handle 14. This makes it particularly easy and safe for a user to completely remove a tray 9, for example after combustion, and replace it with another tray 9 that can be filled with fuel. Such a tray 9 can have an upper tray part 114 and a lower tray part 115 that can be detached from one another. A grid 10 can be firmly connected to the upper tray part 114, for example by being manufactured in one piece. A handle 14, for example a rod-shaped handle, can be firmly connected to the grid 10, for example by welding.The handle 14 may end slightly above the upper edge 32 of the bowl 9 or at least at the level of the upper edge 32 of the bowl 9 in order to be reliably accessible above fuel and / or ash.

[0243] So that all of the parts shown of this shell 9, including the handle 14, can be firmly connected to one another, the handle 14 and the grille 10 can be firmly connected to one another. A weld seam 122 can be provided for this purpose. The grille 10 can be connected to an upper shell part 114 as one piece. The grille 10 and upper shell part 114 can consist of one piece. This means that at least two pieces are not first manufactured and then joined together to produce the grille 10 and upper shell part 114. The shell part 114 and the grille 10 can be produced from a single sheet metal, for example by deep drawing, forming, punching and / or drilling. The upper edge 32 of the upper shell part 114 can be rolled to stabilize the shell 9. The outer wall of the upper shell part 114 can be curved, for example by deep drawing. The outer wall of the upper shell part 114 may taper downwards.The outer wall of the upper shell part 114 can open into a bottom side 117 of the upper shell part 114, which initially runs horizontally in the erected state of the shell 9, i.e. can be an annular disc.

[0244] The grate 10 can be curved upwards toward its center to ensure stability with minimal material expenditure. The grate 10 is then curved upwards when the fire basket 1 is properly erected. The grate 10 can merge into the inner edge of the annular disc 117. The grate 10 can be perforated, as can be seen in Figure 33.

[0245] The handle 14 of the bowl 9 can have a thread at its lower end 123. A nut 122 can be screwed onto the lower end 123 with the thread in order to firmly connect the lower bowl part 115 to the upper bowl part 114. The nut 122 can be a wing nut so that the nut 122 can be loosened without tools. Alternatively, the lower bowl part 114 can have an internal thread for screwing on, so that by turning the lower bowl part 114, it can be screwed onto the thread of the handle 114. It is therefore also possible to be able to loosen the lower bowl part 114, preferably without tools, for example in order to be able to empty and clean the lower bowl part 114 separately.

[0246] The lower shell part 115 can have one or more outwardly bent tabs 124 on its upper edge. A tab 124 can be at least partially circumferential. Exactly three tabs 124 can be provided to create a three-point support. The one or more tabs 124 can be pressed against the underside 117 of the upper shell part 114 when the rod 14 is screwed using the nut 122 or with an internal thread that is firmly connected to the lower shell part 115. Damage caused by excessive forces resulting from a screw connection can thus be particularly reliably prevented.

[0247] The upper shell part 114 can have a circumferential slope 125 on its underside, whereby this region of the upper shell part 114 tapers downwards. The slope 125 can be adjacent to the upper edge of the lower shell part 115. Such a circumferential slope 125 can contribute to favorable flow conditions to support good combustion.

[0248] The grid 10 can be connected to the lower end of the slope 125 and can be curved upwards towards the middle for stability reasons.

[0249] Figure 36 shows the underside of the shell 9 from Figure 35. Adjacent to one or more tabs 124, a substantially curved shape of the side wall of the lower shell part 115 may deviate from the curved shape for stabilization reasons and instead be flattened, as can be seen in Figure 36.

[0250] Figure 37 shows another embodiment of a grill attachment 96 for a fire basket 1. The grill attachment 96 can be an independent invention, i.e., the subject of patent claims, independent of the fire basket.

[0251] The grill attachment 96 can be placed on the upper edge of the fire basket 1. The grill attachment 96 can include a grill plate 97. The grill plate 97 can protrude laterally from the fire basket 1. Instead of a grill plate 97, a grill grate can be provided. A combination of grill grate and grill plate can also be provided.

[0252] The grill attachment 96 can include a spacer 98. There is then a distance between the grill plate 97 and the upper edge of the fire basket 1 when the grill attachment 96 is placed on the fire basket 1. The spacer 98 of the grill attachment 96 can be placed on the upper edge of the fire basket 1. The spacer 98 can include feet 99 that can be placed on the upper edge of the fire basket 1. The spacer 98 and the grill plate 97 can be permanently connected to one another. The spacer 98 and the grill plate 97 can be manufactured as a single piece. In this case, two parts are not manufactured and subsequently joined together. The spacer 98 and the grill plate 97 can be a one-piece casting. The spacer 98 and the grill plate 97 can be manufactured using a metal casting process. The spacer 98 and the grill plate 97 can be manufactured separately.Spacer 98 and grill plate 97 may have been joined together after their manufacture. The same applies if a grill grate is provided.

[0253] The feet 99 can be used to create gaps 126 or other openings adjacent to the upper edge of the fire basket when the grill attachment 96 is placed on the fire basket 1. Heat can be conducted to an outer edge region of the grill attachment 96, for example to an outer area of ​​the grill plate 97, via such a gap 126 or differently shaped openings. Flames can reach through the gaps 126 or corresponding openings in order to heat the outer edge region. By providing one or more gaps 126 or differently shaped openings which, when placed on, border the upper edge of the fire basket 1, it is possible, for example, to divide the grill plate 97 into two different heat zones. To achieve this, there can be a gap 126 or differently shaped openings above the gap 126 ordifferently shaped openings, there are no further gaps or differently shaped openings through which heat can be conducted to an outer edge area of ​​the grill attachment 96. The grill attachment 96 shown in Figure 37 thus makes it possible to obtain differently heated zones on a grill plate 97 or on a grill grate. An inner, peripheral area can thus be heated particularly intensely, for example, for grilling sausages. An adjacent outer, peripheral area can be heated less intensely, for example, for grilling vegetables.

[0254] It is also possible that instead of gaps 126 or differently shaped openings which border the upper edge of the fire basket 1 when in place, there are slots or differently shaped openings which are at a distance from the upper edge of the fire basket 1. Such slots or differently shaped openings are generally at the same height, i.e. they are the same distances from the upper edge of the fire basket 1. Such slots or differently shaped openings are generally the same distances from one another. If there are only such slots or differently shaped openings at one height, then different heating zones on the grill plate 97 or a grill grate can be achieved in this way. However, this design is less preferable for manufacturing reasons, among other things.

[0255] The area near the outer edge 109 of the grill plate 97 can be shaped like a T or an L in cross-section. A T shape is preferable to an L shape. Such a shape can be provided for stability reasons and / or to prevent liquid from running off. The L shape can point upward if liquid runoff is to be prevented. The L shape can point downward if the only purpose is stabilization.

[0256] The area at the inner edge 127 of the grill plate 97 can be shaped like a T or like an L in cross-section. Such a shape can be provided for stability reasons and / or to prevent liquid from running off. The L-shape can point upwards if liquid running off is to be prevented. The L-shape can point downwards if the purpose is to provide stabilization and / or to provide a drip edge for liquid. A downward-facing L-shape is preferable because liquid running off inwards is less of a problem. It is then also easy to clean the surface of the grill plate 97 from the inside with a spatula.

[0257] The surface of the grill plate 97 can be a plane-parallel plane. The surface of the grill plate 97 can be inclined inward to allow liquid to drain inward.

[0258] Figure 38 shows the underside of the grill attachment 96. There can be exactly three feet 99 to ensure a wobble-free placement on the upper edge of the fire basket 1. However, there can also be more than three feet 99, such as exactly four or exactly five feet 99. A foot 99 of the spacer 98 can have a step 102 on its underside to enable the foot 99 to be placed on an uppermost edge of the fire basket 1 in such a way that the foot 99 and thus the grill attachment 96 are secured against lateral displacement.

[0259] A circumferential web 128 may protrude from the underside. The web 128 may be circular. The web 128 may protrude vertically downward from the grill plate 97 or a grill grate. To achieve a good division into heat zones, the web may have a height of at least 30 mm, or at least 40 mm, or at least 50 mm. To ensure efficient heating and / or to avoid excessive material consumption, the height of the web 128 may not be greater than 100 mm, or not greater than 80 mm, or not greater than 60 mm.

[0260] To avoid excessive material consumption, the thickness of the web 128 can be less than 8 mm, less than 6 mm, or less than 5 mm. For stability reasons, the thickness of the web 128 can be at least 2 mm or at least 3 mm. If a division into two heat zones is desired, increased thermal stresses can occur. To prevent thermally induced damage, a plurality of ribs 129, 130 can be provided. The ribs 129, 130 can project downward from the underside of the grill plate 97. The ribs 129, 130 can run radially from the inside to the outside, as shown in Figure 38.

[0261] For stability reasons, ribs 129 can be connected to the inside of the circumferential web 128. For stability reasons, ribs 129 can be connected to the outside of the inner edge 127 of the grill plate 97. The ribs 129, which can extend from the inner edge 127 to the circumferential web 128, can, for stability reasons, rise in an arcuate manner in the direction of the circumferential web 128, as can be seen in Figure 38. The ribs 129, which can extend from the inner edge 127 to the circumferential web 128, can, for stability reasons, end at the level of the circumferential web 128 and / or at the level of the inner edge 127, as can be seen in Figure 38. For stability reasons, there can be at least nine, at least ten, or at least eleven ribs 129.To avoid excessive material consumption, no more than twenty or no more than fifteen ribs 129 may be present, which may be located between the inner edge 127 and the circumferential web 128. To minimize material consumption, a foot 99 may form an integral unit with a rib 129. A portion of a foot 99 may then be considered part of a rib 129. A portion of a foot 99 thus contributes to stabilization. A foot 99 may have a draft angle to enable production by a casting process.

[0262] For stabilization reasons, ribs 130 can be connected to the outside of the circumferential web 128. For stabilization reasons, ribs 130 can be connected to the inside of the outer edge 109 of the grill plate 97. The ribs 130, which can extend from the outer edge 109 to the circumferential web 128, can preferably rise in a straight line toward the circumferential web 128 for stability reasons, as can be seen in Figure 38. The ribs 130, which can extend from the outer edge 109 to the circumferential web 128, can end below the height of the circumferential web 128 and / or at the height of the outer edge 109 for stability reasons, as can be seen in Figure 38. It has been found that the ribs 130 should end in a middle third of the height of the circumferential web 128. For stability reasons, there may be at least nine, or at least ten, or at least eleven ribs 130.In order to avoid excessive material expenditure, there may be no more than twenty or no more than fifteen ribs 130, which may be located between the outer edge 109 and the circumferential web 128.

[0263] Ribs 130 and ribs 129 may be arranged directly opposite one another for stability reasons, as can be seen in Figure 38.

[0264] Each of the aforementioned ribs 129, 128 and their configurations contribute to avoiding problems due to thermal stresses.

[0265] Figure 39 illustrates that the rod-shaped handle 14 can be tubular in order to be able to conduct air to combustion zones via the rod-shaped handle 14, i.e., through a tube 131. The rod-shaped handle 14 can be open at both of its ends in order to be able to conduct air from the bottom to the top. Alternatively or additionally, the rod-shaped handle 14 can have lateral openings 132 so that air entering the tube 131 at the bottom can exit laterally through openings 132 into a combustion zone. The combustion behavior can be further improved. The rod-shaped handle 14 can be welded on so that an opening can be easily created from below.

[0266] Figure 40 shows a fire basket design with legs 133. The legs 133 can be part of a frame. The legs 133 can be attached directly to the outer wall 2 of the fire basket 1. When erected, the legs 133 can form an angle of less than 90° with the ground, thus widening downwards accordingly. This allows for good stability.

[0267] Leg extensions 134 may be provided that can be connected to the legs 133, for example, by means of a plug-in connection. The leg extensions 134 may be sleeves that can be detachably attached to the legs 133. The legs 133 can be extended using the leg extensions 144. The fire basket 1 can thus be easily set up at different heights with minimal technical material expenditure.

[0268] For example, a screw connection is also possible to connect legs 133 to leg extensions 134. However, for speed reasons, such a connection is less preferable.

[0269] Figure 41 shows a sectional view of further possible details of a fire basket with legs 133 and leg extensions 134. An enlarged section A is also shown. Legs 133 can be attached to the outer wall 2 with a screw connection 135. An alignment element 136 can be connected to the screw connection 135. The alignment element 136 can connect an associated leg 133 to the outer wall 2 in a rotationally fixed manner. Furthermore, the alignment element 136 can determine how each leg 133 is aligned relative to the outer wall 2 of the fire basket 1. The alignment element 136 can comprise a pin that extends into a hole in the outer wall 2 in order to ensure a rotationally fixed connection and a desired alignment. The screw connection 135 can be located further out than a pin, as can be seen in Figure 41.For stability reasons, however, it is preferable for the screw connection 135 to be arranged on the inside and the pin to be positioned further outward. Two screws or screw connections 135 can be provided to fasten a leg 133 to the outer wall 2 in a rotationally fixed manner and with the desired orientation. The alignment element 136 can have a stop by which the orientation of a leg 133 is determined.

[0270] In order to provide a leg 133 and / or a leg extension 134 with little material expenditure, each leg 133 and / or a leg extension 134 can be formed from a profile that is open to one side or only to one side.

[0271] A leg extension 134 can be connected to a leg 133 by a clamp connection. The clamp connection can comprise a clamp that can clamp a portion of a leg 133. There can be wings above and below each portion, defining the portion that can be clamped. The position of a clamp can thereby be fixed. This allows a leg extension 134 to be held non-slidably on a leg 133.

[0272] The leg extension 134 can have an insert 137 at the upper end. The insert 137 can form a slot into which a leg 133 can be pushed. The insert 137, which consists for example of a metal sheet, can be fastened to the inside of the leg extension 134 by means of tabs 138. The tabs 138 can be fastened to the leg extension 134 by a material-to-material connection. The material-to-material connection can be a welded connection. A form-fitting connection, for example using screws, is also possible. A force-fitting connection cannot be ruled out either. Tabs 139 pointing inwards can be provided in order to center a leg 133.

[0273] Figure 41 also shows another possibility for supplying air using a cylinder 140. Air can be directed from bottom to top via the cylinder 140, in particular to the upper combustion zone. The cylinder 140 can have a closed top 141 so that air can be directed specifically to combustion zones. Circumferential openings 142 can be provided in the cylinder wall to direct air to a combustion zone. Openings 142 can be located in the upper third or upper quarter of the cylinder 140 to direct air to the upper combustion zone. Openings 142 can be located in the lower third or lower quarter of the cylinder 140 to direct air to the lower combustion zone. Otherwise, the wall of the cylinder 140 can be closed.

[0274] However, there may also be other openings in the cylinder wall.

[0275] The cylinder 140 can be loosely mounted on the grille 10. In one embodiment, the lower edge of the cylinder 140 can be inserted into gaps in the grille 10 so that the position of the cylinder 140 can be fixed and / or so that the cylinder 140 can be held particularly securely. The lower edge of the cylinder 140 can be inserted into a groove to specify the position of the cylinder 140 and / or so that the cylinder 140 can be held particularly securely. The cylinder 140 can be attached to the grille 10. However, instead of a grille 10, another installation and / or attachment option can also be provided.

[0276] Figure 42 shows legs 133 with leg extensions 134. A plugged-together state is shown on the left. A non-plugged state is shown on the right. In the plugged-in state, the leg extension 134 can be connected to the leg 133 by a clamping action. Lifting the fire basket 1 then does not result in the leg extension 134 becoming detached from the leg 133 due to gravity. The depth and / or width of a leg 133 can increase in a ramp-like manner towards the top in order to reliably and easily achieve a clamping action. Alternatively, an insert 137 can be attached such that the cross-section of the insert tapers towards the bottom in order to reliably achieve a suitable clamping action.

[0277] It is also possible for a locking mechanism to be provided between a leg 133 and a leg extension 134. It is possible for locking to be possible in different positions to allow more than two different heights for setting up the fire basket 1. An example of a locking mechanism is a push button that can snap into a hole. The push button can be provided on the leg 133, and one or more holes for snapping and locking can be provided on the leg extension 134, or vice versa. A snap-in connection can be provided for locking.

[0278] Figure 43 shows a lid 84 with an opening covered by a cover 143 attached to the lid. The lid 84 can then be easily put on even when the fire basket 1 is still warm. The cap 143 can also serve as a handle for the lid 84.

[0279] Figure 44 shows a further embodiment of a frame 6 with a heat-shielding wall 7. The heat-shielding wall 7 has a plurality of segments 144, 145, which may be triangular in shape. Segments 145 may protrude from a central segment 144, for example, diagonally upwards. Three segments 145 may protrude diagonally upwards. Gaps in the frame 6 can thus be covered. The heat-shielding wall 7 can be inserted into the frame 6. The diagonally upwardly protruding segments 145 may have collars 146 on the sides, which protrude downwards when in place. The heat-shielding wall 7 can be held to the frame by these collars 146 and by the segments.

[0280] The heat-shielding wall 7 can be firmly connected to the frame 6. This embodiment represents an independent invention.

Claims

Claims 1. Fire basket (1) with an inner wall (3), with an outer wall (2) opposite the inner wall (3), with a first opening (20) on the top side of the fire basket (1), with a second opening (19) on the underside or at the bottom of the fire basket (1), with one or more holes (4) at the top side in the inner wall (3) through which air can flow into an upper combustion zone of the fire basket (1), with one or more holes or openings (11, 12) at the underside of the inner wall (3) through which air can flow into a lower combustion zone of the fire basket (1), wherein the one or more holes (4) present at the top side in the inner wall (3) are arranged at the level of the upper third or at the level of the upper quarter (e / 4) of the height of the outer wall (2).

2. Fire basket (1) according to the preceding claim, characterized in that the cross-section between the inner wall (3) and the outer wall (2) tapers in the direction of the one or more holes (4) which are present in the upper side of the inner wall (3).

3. Fire basket (1) according to one of the preceding claims, characterized in that the cross-section between the outer wall (2) and the inner wall (3) has a maximum between the one or more holes (4) at the top of the inner wall (3) and the one or more holes or openings at the bottom of the inner wall (3).

4. Fire basket (1) according to one of the preceding claims, characterized in that the outer wall (2) is shaped like a part of a sphere or like a part of an oval or like a part of an egg.

5. Fire basket (1) according to one of the preceding claims, characterized in that an upper region of the inner wall (3) is shaped like a cylinder or a truncated cone.

6. Fire basket (1) according to one of the preceding claims, characterized in that the inner wall (3) and outer wall (2) run parallel or at least substantially parallel in a lower region.

7. Fire basket (1) according to one of the preceding claims, characterized in that the upper edge (29) of the inner wall (3) rests prestressed on the upper edge (28) of the outer wall (2).

8. Fire basket (1) according to one of the two preceding claims, characterized in that the upper edge (29) of the inner wall (3) rests inclined on the upper edge of the outer wall (2) in such a prestressed manner that the upper edge (28) of the outer wall (2) is pressed outwards.

9. Fire basket (1) according to one of the preceding claims, characterized in that a bowl (9) is loosely inserted into the inner wall (3).

10. Fire basket (1) according to the preceding claim, characterized in that a grid (10) is loosely inserted in the bowl (9).

11. Fire basket (1) according to the preceding claim, characterized in that the bowl (9) has one or more holes (11) and / or openings (12) above and below the grate (10) through which air can be directed to the grate (10) for combustion.

12. Fire basket (1) according to the preceding claim, characterized in that the one or more holes and / or openings (12) below the grid are covered by a cover (13) which runs inclined towards the center of the bowl (9).

13. Fire basket according to one of the four preceding claims, characterized in that the bowl (9) has a centrally arranged, rod-shaped handle (14).

14. Fire basket (1) according to the preceding claim, characterized in that the rod-shaped handle (14) protrudes from the upper side of the bowl (9).

15. Fire basket (1) according to one of the preceding claims, characterized in that the fire basket (1) comprises a removable, upwardly tapering fire basket attachment (5) above the outer wall (2) and / or inner wall (3).

16. Fire basket (1) according to the preceding claim, characterized in that the fire basket attachment (5) is double-walled or comprises a double wall.

17. Fire basket (1) according to one of the preceding claims, characterized in that the outer wall (2) is made of coated steel and the inner wall (3) is made of stainless steel.

18. Fire basket (1) according to one of the preceding claims, characterized in that at least one web (15) is fixed to the underside of the inner wall (3) in a form-fitting manner and / or by screwing, and presses upwards against an upper edge of the outer wall (2).

19. Fire basket (1) according to one of the preceding claims, with a grill attachment (96) which can be placed on the fire basket and which comprises an annular disc-shaped grill plate (97) and openings (105, 106) below the grill plate (97).

20. Fire basket (1) according to one of the two preceding claims, characterized in that the grill plate (97) projects laterally relative to the fire basket (1) when viewed from above.

Images