Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
1999-07-19
2001-06-26
Paik, Sang (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
Reexamination Certificate
active
06252205
ABSTRACT:
FIELD OF THE INVENTION
The invention pertains to a mount for a cooking surface, the edge of which is surrounded at least in parts by a frame or sections of a frame comprised of plastic, whereby the cooking surface with the frame (the frame sections) can be supported in an opening of a work plate, and whereby the frame (the frame sections) features a support section that underpins the cooking surface on its underside.
BACKGROUND OF THE INVENTION
Such a mount is known from EP 0 449 347 B1. The cooking surface is formed of a glass ceramic plate or the like. The edge of this glass ceramic plate is hereby encompassed by a circumscribing frame. The frame overlaps the upper and the lower side of the cooking surface, so that the edge is completely enshrouded. The frame itself is sprayed directly onto the cooking surface in a plastic injection molding process. The plastic, in a hot and paste-like state, is hereby injected into an appropriate injection mold into which the cooking surface is also laid. As the plastic cools is solidifies into the frame that tightly applies to the cooking surface. Upon cooling, the plastic shrinks as a result of polymerization processes. The frame pulls together as a result of this material change. It is accompanied by a tensioning in the cooking surface. This has a disadvantageous effect on the stability of the cooking surface.
It is the task of the invention to provide a mount of the above indicated type that can be attached to the cooking surface in a simple manner without influencing the stability.
SUMMARY OF THE INVENTION
This task is accomplished in that the frame (the frame sections) is formed of a temperature resistant plastic reactive foam which is foamed onto the cooking surface.
A low viscosity substance is introduced into a tool mold in order to produce such a mount. This tool mold also receives the cooking surface. The low viscosity substance foams-up, forming the reactive foam. This applies itself without tension to the edge of the cooking surface, where it hardens. This hardening process does not result in shrinkage. Thus, no stress is brought to bear on the cooking surface. The reactive foam features good adhesion, so that the cooking surface is securely fixed. In particular, the cooking surface does not necessarily need to be surrounded by the reactive foam in the edge area on the upper and lower side. If is sufficient if, for example, only the cooking surface is underpinned by the support section. According to the invention, individual frame sections can also be attached at predetermined positions on the cooking surface. This property permits a wider range of design opportunities.
A preferred design variant of the invention provides that the frame/the frame section (in the following the frame section is referred to as the frame for the sake of simplicity) features a lateral part connected to the support section, guided applied against the cooking surface toward the upper side of the cooking surface, and that the cooking surface features a draft in the edge area allocated to the lateral part, said draft, in conjunction with the reactive foam, being under-foamed in order to form an undercut. A mold closure constructed in this manner prevents the cooking surface from releasing from the support section, even when great stress is present. In particular, the draft can be built as a round part of the edge of the cooking surface.
If it is provided that function elements are embedded in the reactive foam of the frame, then other design variants can be materialized in a simple manner. In particular, it is possible that one or more holding parts constructed as function elements are foamed into the support section of the frame, projecting at the underside of the cooking surface and on which one or more installation units can be fastened. For example, it is conceivable that a housing is fixed to the mount as an installation unit, said housing lodging heating elements. Depending on the design of the function elements, it is also possible to connect only an installation plate to the mount, for the heating elements.
Anchor elements are connected to these in order to securely fix the function elements, said anchor elements extending transverse to the direction of principal load that acts on the function elements.
Furthermore, it is conceivable that one or more catch receptacles can be formed into the frame, onto which supplemental parts can be engaged. For example, a cover section with a panel that at least partially covers the visible surface can be used. The panel alone can act as the characterizing feature, as a design element for visual appearance. It is also conceivable to have the panel constructed of high quality material as compared to the mounting; scratch resistant, harmless to foodstuffs and temperature resistant.
The reactive foam for example, can be formed of silicone or polyurethane or of EPDM or PTFE. Silicone and polyurethane are particularly temperature resistant, and they are not damaged, even if, e.g., hot pans are set on the mount.
If it is provided that the frame (the frame sections) connected to the upper side of the cooking surface transitions into an oblique, downwardly directed flank, and/or that the frame (the frame section) connected to the edge of the cooking surface features a shoulder that can spring back relative to the upper side of the cooking surface, then a pan that is placed in the area over the mount does not come into direct contact with the reactive foam. On the contrary, an insulating air gap is formed.
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patent: 296 20 838 U1 (1996-11-01), None
patent: 0748676A1 (1996-12-01), None
patent: 2 744 201 (1996-01-01), None
Hottum Werner
Schultheis Bernd
Jansson & Shupe & Munger Ltd.
Paik Sang
Schott Glas
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