EP0715125B1 - Protection device for edges of openings in shaped bodies of glass ceramics, glass or ceramics - Google Patents

Description

The invention relates to a device for protecting the edges of openings in moldings made of glass ceramic, glass or ceramic, in particular from Openings for the passage of atmospheric gas burners in cooking hobs, against mechanical damage and to avoid contamination and Damage to arrangements lying under the molded body due to the openings in the molded body penetrating liquids, one over the Edge of the respective opening on the molded body overlapping metallic Cap is attached and between the molded body and the metallic A sealing and heat-resistant material is introduced.

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 by means of a shaped body made of glass, Glass ceramic or ceramic, is covered, with each gas burner a passage in the molded body extends over the top thereof and a permanently elastic connection between the molded body and each gas burner and sealing device with a solid and liquid-tight the edge area of the passage and at least one formed by the gas burner Connection surface engaging connecting and sealing element attached is, wherein the gas burner is carried by the shaped body and Safety and holding devices between the gas burner and the support frame are attached, in the event of breakage of the molded body and thus elimination its load bearing capacity with limited mobility Restraint and torsion protection for each of the gas burners are effective.

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

From US-PS 5,046,477 it is known to seal the burner opposite to improve the glass or glass ceramic molded body in that the Passage is only made so large that it can accommodate the gas burner and that the gas burner for sealing at the passage edge firmly with the glass or glass ceramic molded body is connected. Furthermore, the gas burner attached to a crossbar connected to the support frame.

Such a mechanically rigid connection between a brittle Molded body, a support frame and the gas burner leads under mechanical or thermal stress on the cooking surfaces to form tension in the molded body. In any case, with a hob or a gas stove significantly increases the risk of breakage of the molded body.

GB-A-2 149 089 describes a device for protecting the edges of Openings in shaped bodies made of glass ceramic, glass or ceramic, in particular of openings for the passage of atmospheric gas burners in cooking hobs, against mechanical damage and to avoid contamination and damage to arrangements under the molded body liquids penetrating through the openings in the molded body, whereby one over the edge of the respective opening onto the molded body metallic cap as a comprehensive collar part of the burner itself is appropriate. Through this connection of the burner and molded body Tensions arise.

The object of the invention is therefore the above in a burner arrangement described type a fully effective for practical use, sealing and / or heat-insulating protective device between the gas burner and to provide the molded body consisting of glass ceramic, glass or ceramic, which is also easy to clean and breaks due to tension to exclude. The assembly of the protective device should be simple, without gluing and with little time, material and costs be feasible.

Furthermore, the invention has for its object atmospheric gas burners sure to pass through the molded body in a suitable manner and position and provide edge protection for the edge of the hole.

To solve these problems it is proposed according to the invention that the metallic cap has a shaft that has a smaller diameter than the opening in the molded body, and an associated, from bend the shaft axis by at least 90 ° and be flush with the molded body final collar at one end of the shaft, the other end of the shaft at least three, especially eight or more bendable Forms tabs that extend towards the level of the molded body are bendable that the throw formed by means of of its tabs which can be bent at least 90 ° out of the shaft axis and which the overlap one side of the molded body and the other by means of the collar, which lies flush on the other side of the molded body, clamping is stable on the molded body.

In a preferred embodiment, in addition to the bending tabs which overlap an edge region of the opening in the molded body on one side, the metallic cap has further tabs which protrude into the interior of the opening and thus serve as abutments 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 as bending tabs be trained. Sometimes it is also advantageous to use the metallic one To form the cover in several parts and the parts forming the cover by press fitting, soldering, gluing, screwing or by one To connect bayonet lock, with this variant preferably in addition also tabs are designed as bending tabs.

Because the openings in the shaped bodies made of glass ceramic, glass or ceramic are usually round, is consequently the metallic cap as a collar ring formed with a cylindrical shaft, the collar ring in preferred embodiment also open, as a prestressed spring element can be formed that itself at the edge of the opening in the molded body presses.

Another advantageous variant of the invention arises when the metallic Has a collar at one end of the cylindrical shaft and at the other end of the shaft a simple clamping element, in particular a metallic clamping ring is positioned which surrounds the shaft, the tensioning element being defined on the shaft, in particular by latching and / or bends of the shaft is fixed.

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

On the top side, the seal has the task of being liquid-tight Barrier between cap and glass ceramic, glass or ceramic z. B. against Overcooked goods and / or cleaning agents form on the underside the seal protects the molded body from mechanical scratches and damage through the metal.

It can be advantageous that the collar of the metallic cap, in particular Openings for air supply in the vicinity of the shaft Have supply to the gas burner, the openings for the air supply positioned or covered to protect against moisture.

In a particularly preferred embodiment of the protective device Edges of the tabs and in particular the edge of the collar of the metallic Bent over the molded body so that the sealing and / or thermal insulation material is held under compressive stress.

Embodiments of the invention are described below with reference to the drawings explained in more detail.

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:

FIGS. 1a and 1b show a one-piece, metallic coupling ring (1) with one overlapping on the top of the glass ceramic plate (3) Collar (2) and with a shaft (4) of a smaller diameter than the hole (5) has. Tabs (6) are formed at the end of the shaft (4) (at least 3 pieces, preferably 8 pieces), which simply by 90 ° bent outwards over the glass ceramic plate (3) and the ring (1) so clamp on the edge of the opening (5) of the glass ceramic plate (7).

Variants of a one-piece, metallic collar ring (1), its overlapping Collar (2) / (2 ') on the top of the glass ceramic plate (3) too is simultaneously led inwards through the bore (5) and there as an abutment 2a for the burner (not shown) and 2b.

FIG. 2c shows a particularly simple preform of a metallic one Take the throw over, one on the top of the glass ceramic plate (3) overlapping collar (2), a shaft (4) with bending tabs (6) and also additionally in the interior of the opening (5) in the molded body (3) reaching part (2 ').

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

Figure 4 shows a two-part metallic coupling ring (1). Two Rings, one ring for the top (1 ') and one ring for the bottom (1 "), with circumferential overlaps (2) / (6) and matched to each other Shaft diameters (4) / (4 ') are inserted into each other from below and above and protect the drilling edge (7) in this way. Adjusting the shaft diameter must be such that the ring pairing (1 ') / (1 ") is not can solve independently. This can e.g. B. by an interference fit of the two Parts done. Another option is the two rings (1 ') / (1' ') to be soldered or glued together.

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

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

Figures 6a and 6b illustrate the variant of the invention in which a split ring (9) in the direction of the cylindrical axis (1) as Spring element is inserted into the opening (5) in the molded body (3).

The ring (1) lies in the bore (5) due to the spring preload to the edge of the hole (7), so that one above (2) and one below (6) protective device covering the drilling edge.

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 area 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) the metallic cap (1) and the molded body (3), for. B. made of glass ceramic seals on the top and possibly also on the bottom (10) / (10 ').

On the top, the seal (10) has the task in particular liquid-tight barrier between cap (1) and glass ceramic, glass or ceramic z. B. against overcooked goods 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 is a special one for the surface of the molded body (3) remove the bent version of the metallic cap (1), which keeps the seal (10) under pressure through its design.

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

At the same time, the other end serves as an abutment for the gas burner (8).
To ensure that no overflow or rinsing water can get 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 create a defined gap (13) 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 ') at one end of the Shaft (4) has a collar (2), and at the other end of the shaft (4) a simple metallic clamping element (15) as a second ring (1 ") is positioned, and includes the shaft (4). The clamping element (15) defined here defined, e.g. B. by a nose-shaped bend (14) of the ring (1 ').

With the present invention is a simple and inexpensive way shown to pass gas burners through a plate made of glass / glass ceramic and thereby the edges of the openings during assembly, and in front to protect against the ingress of liquids in use. These opportunities have advantages when it comes to assembly and servicing, and the greatest possible Freedoms in 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 ceramic, 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 (13)

1. Device for protecting the rims (7) of openings (5) in shaped bodies (3) made of glass ceramic, glass or ceramic, especially openings (5) for the passage of atmospheric gas burners (8) on cooking hobs, from mechanical damage and for preventing soiling and damage to arrangements situated underneath the shaped body (3) owing to the ingress of liquids through the openings (5) in the shaped body (3), a metallic bezel (1) which reaches the rim (7) of the respective opening (5) onto the shaped body (3) being fitted and a sealing and heat-resistant material (10) being inserted between the shaped body (3) and the metallic bezel (1) characterized in that the metallic bezel (1) has a body (4), which has a smaller diameter than the opening (5) in the shaped body (3), and a collar (2) which is connected to the body, bends through at least 90° out of the axis (4) of the body and, at one end of the body (4), ends level with the shaped body (3), and the other end of the body (4) forms at least three bendable tabs (6) which can be bent to such an extent in the direction of the plane of the shaped body (3) that the bezel (1) thereby formed is fixed in a stable manner on the shaped body (3), and so as to clamp the latter, on the one hand, by means of its tabs (6) - which can be bent through at least 90° out of the axis (4) of the body - which reach over one side of the shaped body (3) and, on the other hand, by means of the collar (2), which rests level on the other side of the shaped body (3).
2. Protective device according to Claim 1, characterized in that, in addition to the bending tabs (6) which reach over a rim area of the opening (7) in the shaped body (3) on one side, the metallic bezel (1) has further tabs (6'), which project into the area of the opening (5) and thus serve as abutments for a surface formed by the gas burner (8).
3. Protective device according to claim 2, characterized in that the tabs (2'/6')) projecting into the area of the opening form two parallel planes between which a surface formed by the gas burner (8) is held.
4. Protective device according to Claims 1 to 3, characterized in that the metallic bezel (1) is of one-piece design and the tabs (6) are designed as bending tabs.
5. Protective device according to Claims 1 to 3, characterized in that the metallic bezel (1) is of multipart design and the parts which form the bezel can be connected by press fitting, soldering, adhesive bonding, screw-fastening or by means of a bayonet joint.
6. Protective device according to Claim 5, characterized in that tabs (6) are designed as bending tabs.
7. Protective device according to Claims 1 to 6, characterized in that the metallic bezel (1) is designed as a bezel ring with a cylindrical body (4).
8. Protective device according to Claim 7, characterized in that the bezel (1) ring is designed as an open prestressed spring element which presses against the rim (7) of the opening in the shaped body (3).
9. Protective device according to Claim 8, characterized in that the metallic bezel (1) has a collar (2) at one end of the cylindrical body (4), and a clamping element (15), in particular a clamping ring, which surrounds the body (4) is positioned on the other end of the body (4), the clamping element (15) being fixed in a defined manner on the body (4), in particular latching into it.
10. Protective device according to Claims 1 to 9, characterized in that the sealing and heat-resistant material (10) inserted between the shaped body (3) and the metallic bezel (1) is, in particular, a graphite-containing material and/or a ceramic composite fibre material.
11. Protective device according to at least one of the preceding claims, characterized in that the collar (2) of the metallic bezel (1) has openings (11) for the air supply to the gas burner.
12. Protective device according to Claim 11, characterized in that the openings (11) for the air supply are positioned or covered in such a way as to repel moisture.
13. Protective device according to Claims 1 to 12, characterized in that the rims of the tabs (6) and, in particular, the rim of the collar (2) of the metallic bezel (1) are bent towards the shaped body (3) in such a way that the sealing and heat-resistant material (10) is held under compressive stress.

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