Hob

Details Hob Hob

1997-04-04

1999-11-30

Walberg, Teresa

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

2194601, H05B 368

Patent

active

059946741

ABSTRACT:
A hob comprises a substantially planar member having apertures defining hotplate regions, a glass-ceramic insert being positioned in each aperture above a radiant heating element. The use of a molded glass insert corresponding to a hotplate region offers several advantages over prior art hobs conventionally comprising a glass-ceramic sheet formed by a flat glass process which extends over a plurality of hotplate regions. Another embodiment consists of a drop-in heating unit for a hob comprising a metal can, a substrate, a resilient annular spacer, a radiant heating element and a molded glass-ceramic insert. An over-temperature thermal limiter acts to prevent the unit becoming overheated. A metal compression band extends around a downwardly protruding skirt of the insert, increasing its resistance to shock. The glass-ceramic insert has reinforcing radial spars and a profile which generally has a greater thickness of glass towards its periphery and a generally lesser thickness towards its center, the transition being provided by a curved profile. Such shaping of the insert improves both its transmissive and its conductive properties without a reduction in strength.

REFERENCES:
patent: 2179934 (1939-11-01), Jones
patent: 2870316 (1959-01-01), Ferguson, Jr.
patent: 3316390 (1967-04-01), Gaugler et al.
patent: 3345498 (1967-10-01), Siegla
patent: 3346721 (1967-10-01), Bassett, Jr.
patent: 3348025 (1967-10-01), Bassett, Jr. et al.
patent: 3355575 (1967-11-01), Bassett, Jr. et al.
patent: 3423572 (1969-01-01), Pansing
patent: 3501621 (1970-03-01), Pansing et al.
patent: 3885128 (1975-05-01), Dills

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