EP0715125A1 - Protection device for edges of openings in shaped bodies of glass ceramics, glass or ceramics - Google Patents

Abstract

The invention provides a device for protecting the edges of openings in molded articles made of glass ceramic, glass or ceramic, in particular of openings for carrying out atmospheric gas burners in cooking hobs from mechanical damage and for avoiding contamination and damage to arrangements lying under the molded article through which Liquids penetrating openings in the molded body, wherein a metallic cap that extends over the edge of the respective opening on both sides of the molded body is attached and advantageously a sealing and / or heat-insulating material is introduced between the molded body and the metallic cap. <IMAGE>

Description

The invention relates to a device for protecting the edges of openings in molded articles made of glass ceramic, glass or ceramic, in particular of openings for carrying out atmospheric gas burners in cooking hobs, against mechanical damage and for avoiding soiling and damage to arrangements lying under the molded article liquids penetrating the openings in the molded body.

In known gas stoves or hobs with burner arrangements of this type, the gas burners are fixed in the support frame or housing. A, in particular, toughened glass plate covering the surrounding surface of the gas burner is provided with a much larger opening than would actually be required for the respective gas burner. The wide annular gap thus formed between the gas burner and the lead-through edge is covered with a simple annular collar made of sheet metal. This ensures mechanical separation of the gas burner from the glass plate, but this method of mounting the gas burner inside the glass plate has a disadvantageous effect in practical use, particularly with regard to the cleaning behavior. With these devices, overcooked food can penetrate into the joint between the tempered glass plate and the sheet metal collar.
Cleaning these devices is difficult and often even requires at least partial disassembly.
Such connections also have a high proportion of individual parts and are therefore expensive and very complex to assemble.

DE 41 33 409 C2 shows a burner arrangement, for example for cooking hobs, in which at least one gas burner is mounted in a support frame and the surrounding surface of the gas burner is covered by a molded body made of glass, glass ceramic or ceramic, each gas burner being covered by a passage in the Shaped body extends over its top and between the molded body and each gas burner a permanently elastic connection and sealing device with a solid and liquid-tight on the edge region of the passage and at least one connecting surface formed by the gas burner connecting and sealing element is attached, the gas burner from the Shaped body is carried and securing and holding devices are attached between the gas burner and the support frame, which, if the shaped body breaks and thus loses its load-bearing capacity, with limited mobility with respect to restraint and torsion protection f for each of the gas burners are effective.

This burner arrangement is difficult to assemble. Furthermore, glued connections solve the mechanically rigid connection, but are disadvantageous in recycling, assembly, e.g. B. because of the necessary drying time of the silicone adhesive and when servicing.

From US Pat. No. 5,046,477 it is known to improve the sealing of the burner with respect to the glass or glass ceramic shaped body in that the passage is only made so large that it can accommodate the gas burner and that the gas burner is fixed to the passage edge for sealing is connected to the glass or glass ceramic molded body. Furthermore, the gas burner is attached to a crossbar connected to the support frame.

However, such a mechanically rigid connection between a brittle fragile shaped body, a support frame and the gas burners leads to the formation of tension in the shaped body under mechanical or thermal stress on the cooking surfaces. In any case, the risk of breakage of the molded body would be significantly increased in the case of a hob or a gas stove.

The object of the invention is therefore to provide in a burner arrangement of the type described above a fully effective, sealing and / or heat-insulating protective device for practical use between the gas burner and the molded body made of glass ceramic, glass or ceramic, which is also easy to clean and rule out a break due to tension. The protection device should be easy to assemble, without any adhesive work and with little expenditure of time, material and costs.

The invention is also based on the object of safely guiding and positioning atmospheric gas burners in a suitable manner through the shaped body and of providing edge protection for the edge of the bore.

To achieve these objects, it is proposed according to the invention that a metallic cap is provided over the edge of the respective opening on both sides of the molded body and, in a particularly preferred embodiment, a sealing and / or heat-resistant material is introduced between the molded body and the metallic cap.

According to the invention, the metallic cap has a shaft that has a smaller diameter than the opening in the shaped body, and an associated collar at one end of the shaft that bends at least 90 ° from the shaft axis and ends flush with the shaped body, the other end of the shaft forms at least three, in particular eight or more bendable tabs, which are bendable in the direction of the plane of the molded body to such an extent that the union formed thereby, on the one hand, by means of its tabs bendable by at least 90 ° from the shaft axis overlap the molded body and, on the other hand, stably clamps on the molded body by means of the collar, which lies flush on the other side of the molded body.

In a preferred embodiment, in addition to the bending flaps which overlap an edge region of the opening in the molded body on one side, the metallic cap has further flaps which protrude into the inner region of the opening and thus serve as an abutment for a surface formed by the gas burner. Or the tabs projecting into the interior of the opening even form two parallel planes, between which a surface formed by the gas burner is held.
This considerably simplifies the positioning and centering of the burner.

The metallic cap can be made in one piece and the tabs can be designed as bent tabs. However, it is sometimes also advantageous to design the metallic cap in several parts and to connect the parts forming the cap by press fitting, soldering, gluing, screwing or by means of a bayonet lock, with this variant also preferably using tabs as bending tabs.

Since the openings in the shaped bodies made of glass ceramic, glass or ceramic are mostly round, the metallic union is consequently designed as a union ring with a cylindrical shaft, in a preferred embodiment the union ring can also be open as a prestressed spring element which attaches itself to the Press the edge of the opening in the molded body.

A further advantageous variant of the invention arises if the metallic cap has a collar at one end of the cylindrical shaft and a simple clamping element, in particular a metallic clamping ring, is positioned at the other end of the shaft, which comprises the shaft, the clamping element defining on the shaft, is determined in particular by locking and / or bending of the shaft.

All embodiments of the protective device according to the invention have in common that a sealing and / or heat-insulating material, in particular a graphite-containing temperature-resistant material and / or a ceramic fiber material, is expediently introduced between the molded body and the metallic cap.

On the top, the seal has the task of a liquid-tight barrier between the union and glass ceramic, glass or ceramic z. B. against overcooking and / or cleaning agents, on the underside, the seal protects the molded body from mechanical scratches and damage from the metal.

It can be advantageous for the collar of the metallic cap, in particular in the vicinity of the shaft, to have openings for the air supply for supplying the gas burner, the openings for the air supply being positioned or covered to repel moisture.

In a particularly preferred embodiment of the protective device, the edges of the tabs and in particular the edge of the collar of the metallic cap are bent toward the shaped body in such a way that the sealing and / or heat-insulating material is held under compressive stress.

Exemplary embodiments of the invention are explained in more detail below with reference to the drawings.

Figur 1a

eine perspektivische Ansicht eines einteiligen Überwurfringes mit Biegelaschen

Figur 1b

einen Teilschnitt eines einteiligen Überwurfs nach der Erfindung

Figur 2a/b

Teilschnitte weiterer einteiliger Ausführungsformen der Erfindung, bei denen Laschen in den Innenbereich der Öffnung ragen

Figur 2c

einen Teilschnitt einer Vorform eines einfachen einteiligen Metallüberwurfs

Figur 3

einen Teilschnitt einer einteiligen Ausführungsform, bei der die nach innen ragenden Laschen zwei parallele Ebenen zur Befestigung des Gasbrenners bilden

Figur 4

einen Teilschnitt eines zweiteiligen Überwurfes

Figur 5a/b/c

Teilschnitte weiterer zweiteiliger Ausführungsformen, bei denen Laschen in den Innenbereich der Öffnung im Formkörper ragen

Figur 5d

einen Teilschnitt einer zweiteiligen Ausführungsform, bei der die nach innen ragenden Laschen zwei parallele Ebenen zur Befestigung des Gasbrenners bilden

Figur 6a/b

eine Aufsicht und einen Teilschnitt auf einen geteilten Überwurfring, der als Federelement ausgebildet ist

Figur 6c/d/e

eine Aufsicht und Teilschnitte von zwei Ausführungsformen geteilte Überwurfringe, bei denen Laschen auch in den Innenbereich der Öffnung ragen

Figur 7

einen Teilschnitt der erfindungsgemäßen Schutzeinrichtung mit Dichtungsmaterialien

Figur 8

eine perspektivische Ansicht eines Überwurfringes mit gleichmäßig auf dem Umfang verteilten Luftschlitzen

Figur 9

einen Teilschnitt eines mit Luftschlitzen versehenen Überwurfringes und einen diesen abdeckenden Zierring.

Figur 10

einen Teilschnitt einer weiteren Variante eines Überwurfringes mit Spannelement

Figur 11

eine perspektivische Ansicht eines Spannringes nach Figur 10

Show it:

Figure 1a

a perspective view of a one-piece collar ring with bending tabs

Figure 1b

a partial section of a one-piece union according to the invention

Figure 2a / b

Partial sections of further one-piece embodiments of the invention, in which tabs protrude into the inner region of the opening

Figure 2c

a partial section of a preform of a simple one-piece metal cap

Figure 3

a partial section of a one-piece embodiment, in which the inwardly projecting tabs form two parallel planes for fastening the gas burner

Figure 4

a partial section of a two-part union

Figure 5a / b / c

Partial sections of further two-part embodiments in which tabs protrude into the inner region of the opening in the molded body

Figure 5d

a partial section of a two-part embodiment, in which the inwardly projecting tabs form two parallel planes for fastening the gas burner

Figure 6a / b

a top view and a partial section of a split collar, which is designed as a spring element

Figure 6c / d / e

a top view and partial sections of two embodiments split collar rings, in which tabs also protrude into the interior of the opening

Figure 7

a partial section of the protective device according to the invention with sealing materials

Figure 8

a perspective view of a collar ring with evenly distributed on the circumference louvers

Figure 9

a partial section of a union ring provided with louvers and a decorative ring covering this.

Figure 10

a partial section of a further variant of a collar ring with clamping element

Figure 11

10 shows a perspective view of a clamping ring according to FIG. 10

In detail:
Figures 1a and 1b show a one-piece, metallic collar ring (1) with an overlapping collar (2) running around on the top of the glass ceramic plate (3) and with a shaft (4) which has a smaller diameter than the bore (5). Tabs (6) are formed at the end of the shaft (4) (at least 3 pieces, preferably 8 pieces), which are simply bent outwards by 90 ° over the glass ceramic plate (3) and thus the ring (1) at the edge of the opening ( 5) clamp the glass ceramic plate (7).

Variants of a one-piece, metallic collar ring (1), whose overlapping collar (2) / (2 ') on the top of the glass ceramic plate (3) is also simultaneously guided inwards over the bore (5) and there as an abutment for the burner (not 2) shows FIGS. 2a and 2b.

From Figure 2c, a particularly simple preform of a metallic cap can be seen, which has a collar (2) overlapping on the top of the glass ceramic plate (3), a shaft (4) with bending tabs (6) and also one in the interior of the Part (2 ') opening (5) in the molded body (3).

In Figure 3, a one-piece collar ring (1) is shown, wherein one of the overlaps (2) / (2 ') on the top of the molded body (3) is also simultaneously guided into the interior of the bore (5) and there as a bearing for the Burner (8) is used. The tabs (6) / (6 ') at the end of the shaft (4) are mutually bent both outwards over the glass ceramic (3) and in the other direction over the burner (8).

FIG. 4 shows a two-part metallic collar ring (1). Two rings, one ring each for the upper side (1 ') and one ring for the lower side (1' '), with circumferential overlaps (2) / (6) and matched shaft diameters (4) / (4 ') are inserted into each other from below and above and in this way protect the drilling edge (7). The shaft diameter must be adjusted so that the ring pairing (1 ') / (1' ') cannot come loose on its own. This can e.g. B. done by a press fit of the two parts. Another possibility is to solder or glue the two rings (1 ') / (1' ') together.

Figures 5a, b and c show three possible variants of a two-part embodiment of the protective device according to the invention whose overlapping collar (2) / (2 ') on the top of the molded body (3) is also simultaneously guided into the interior of the opening (5) and there serves as an abutment for the burner (not shown).

FIG. 5d shows a partial section of a two-part embodiment in which the tabs projecting inward into the area of the opening form two parallel planes (2 ') and (6') for fastening and positioning the gas burner (8).

FIGS. 6a and 6b illustrate the variant of the invention in which a union ring (1), which is divided in the direction of the cylindrical axis, is inserted as a spring element into the opening (5) in the molded body (3).

In the bore (5), the ring (1) rests against the bore edge (7) due to the resilient preload, so that a protective device that overlaps the top (2) and bottom (6) over the bore edge results.

According to FIGS. 6c, d and e, even with a coupling ring (1) divided according to FIGS. 6a / 6b, tabs (2) can extend inwards into the region of the opening (5) in the molded body.
If desired, the rings (1 ') / (1'') can be soldered, glued or clamped.

In all considered embodiments of the protective device according to the invention, as shown in Figure 7, between the overlaps (2) / (6) of the metallic cap (1) and the molded body (3), z. B. made of glass ceramic on the top and if possible also on the bottom seals (10) / (10 ') are attached.

On the top, the seal (10) has in particular the task of a liquid-tight barrier between the cap (1) and glass ceramic, glass or ceramic z. B. against overcooking and / or cleaning agents, on the underside, the seal (10 ') protects the molded body (3) from mechanical scratches and damage from the metal (6).

Furthermore, FIG. 7 shows a special variant of the metallic cap (1) which is bent towards the surface of the shaped body (3) and which, by means of its design, keeps the seal (10) under pressure.

In the variant according to FIGS. 8 and 9, air inlets (11) are provided on the circumference of the collar (2), through which the gas burner (8) can suck in its primary air. This coupling ring (1) is fastened in the borehole in the same way as the other rings, namely by bending the tabs (6).

At the same time, the other end serves as an abutment for the gas burner (8). So that no overflow or rinsing water can get through the air slots into the interior of the bowl when cleaning or during the cooking process, the collar ring (1) is covered with a decorative ring (12). This only sits loosely and is fixed to the burner housing. So that the required primary air can continue to flow in, small feet are attached all around this decorative ring (12), which allow a defined gap (13) to arise between the decorative ring (12) and glass ceramic (3).

Figures 10 and 11 illustrate a further embodiment of the invention, in which the metallic collar ring (1 ') has a collar (2) at one end of the shaft (4) and a simple metallic tensioning element (4) at the other end of the shaft (4). 15) is positioned as a second ring (1 '') and comprises the shaft (4). The clamping element (15) is defined here, for. B. by a nose-shaped bend (14) of the ring (1 ').

With the present invention, a simple and inexpensive way is shown to lead gas burners through a plate made of glass / glass ceramic and thereby protect the edges of the openings during assembly and against the ingress of liquids during use. These options have advantages during assembly and servicing, they offer the greatest possible freedom in terms of designer design and are at the same time elegant, easy to clean and inexpensive to manufacture.

• es gibt keine mechanisch starre Verbindung zwischen der Glaskeramik oder dem Glas und dem Gasbrenner. Dies ist notwendig, damit die bei einer mechanischen Belastung des Formkörpers auftretende Energie ohne Bruch aufgenommen werden kann,
• bei einem bei Glas/Glaskeramik nie auszuschließendem Bruch ist gewährleistet, daß die Gaszuleitung zum Gasbrenner intakt und dicht bleibt,
• der Bohrlochrand der Brennerdurchführung ist vor unzulässig hohen mechanischen Belastungen geschützt,
• es ist sichergestellt, daß kein Überkochgut oder sonstige Flüssigkeiten in den Innenraum des Kochgerätes laufen können,
• es ist nur ein geringer Montageaufwand notwendig, d. h. auch ein
• leichter und kostengünstiger Service beim Austausch von defekten Komponenten oder beim Austausch von Düsen, z. B. für andere Gasarten.

The advantages of the invention are:

• there is no mechanically rigid connection between the glass ceramic or the glass and the gas burner. This is necessary so that the energy that occurs when the molded body is mechanically loaded can be absorbed without breaking,
• in the event of a break that can never be ruled out with glass / glass ceramics, it is ensured that the gas supply line to the gas burner remains intact and tight,
• the borehole edge of the burner bushing is protected against impermissibly high mechanical loads,
• it is ensured that no overcooked goods or other liquids can run into the interior of the cooking appliance,
• only a small amount of assembly is necessary, ie also one
• easy and inexpensive service when replacing defective components or when replacing nozzles, e.g. B. for other types of gas.

Claims (15)

Device for protecting the edges of openings in molded articles made of glass ceramic, glass or ceramic, in particular of openings for carrying out atmospheric gas burners in cooking hobs, against mechanical damage and for avoiding contamination and damage to arrangements lying under the molded article through the openings in the molded article penetrating liquids,
characterized,
that a metallic cap is attached over the edge of the respective opening on the molded body. Protection device according to claim 1,
characterized,
that a sealing and heat-resistant material is introduced between the molded body and the metallic cap. Protection device according to claims 1 or 2,
characterized,
that the metallic cap has a shaft that has a smaller diameter than the opening in the molded body, and an associated collar that bends at least 90 ° from the shaft axis and is flush with the molded body at one end of the shaft and the other end of the shaft forms at least three, in particular eight or more bendable tabs in the direction of the The plane of the molded body is bendable to such an extent that the cap thus formed can be bent by means of its tabs which can be bent by at least 90 ° from the shaft axis, which overlap one side of the molded body and on the other hand by means of the collar, which lies flush on the other side of the molded body. clamps firmly to the molded body. Protection device according to claims 1 to 3,
characterized,
that the metallic cap in addition to the bending tabs, which overlap an edge region of the opening in the molded body on one side, has further tabs which protrude into the inner region of the opening and thus serve as an abutment for a surface formed by the gas burner. Protective device according to claim 4,
characterized,
that the tabs projecting into the interior of the opening form two parallel planes, between which a surface formed by the gas burner is held. Protective device according to claims 1 to 5,
characterized,
that the metallic cap is in one piece and the tabs are designed as bending tabs. Protective device according to claims 1 to 5,
characterized,
that the metallic cap is made of several parts and the parts forming the cap can be connected by press fitting, soldering, gluing, screwing or by a bayonet catch. Protective device according to claim 7,
characterized,
that tabs are designed as bending tabs. Protective device according to claims 1 to 8,
characterized,
that the metallic cap is designed as a collar with a cylindrical shaft. Protective device according to claim 9,
characterized,
that the coupling ring is open, is designed as a prestressed spring element which presses against the edge of the opening in the molded body. Protective device according to claim 9,
characterized,
that the metallic cap has a collar at one end of the cylindrical shaft and a tensioning element, in particular a tensioning ring, is positioned at the other end of the shaft, which comprises the shaft, the tensioning element defining, in particular latching, being fixed on the shaft. Protection device according to claims 2 to 11,
characterized,
that the sealing and heat-resistant material introduced between the molded body and the metallic cap is in particular a graphite-containing material and / or a ceramic fiber material. Protection device according to at least one of the preceding claims,
characterized,
that the collar of the metallic cap has openings for the air supply to supply the gas burner. Protection device according to claim 13,
characterized,
that the openings for the air supply are positioned or covered to repel moisture. Protection device according to claims 1 to 14,
characterized,
that the edges of the tabs and in particular the edge of the collar of the metallic cap are bent towards the shaped body in such a way that the sealing and heat-resistant material is held under compressive stress.

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