Electric hotplate
First Claim
1. An electric hotplate having a metal hotplate member with, in the heated area, an upper, substantially closed planar cooking surface and a smooth, unribbed bottom surface, at least one tubular heater embedded in electrically insulating material and having a flat surface for engaging the bottom surface of the hotplate member and a base plate connected to the hotplate member and enclosing the at least one tubular heater, the hotplate comprising:
- at least one spring element supported between the at least one tubular heater and base plate for resiliently pressing the the least one tubular heater against the bottom surface of the hotplate member;
a heat-resistant insulation layer interposed between the spring member and the at least one tubular heater;
the tubular heater being thin and flexible, and so arranged as to define an unheated central area;
the hotplate member having a thermostat opening in the central area, surrounded by a downwardly directed inner rim; and
,a thermostat support sleeve press-fitted in the thermostat opening defining an annular enclosure for the at least one tubular heater, the base plate being connected to the support sleeve in the central area whereby heat conduction to the cooking surface is enhanced and energy losses due to thermal inertia are reduced.
1 Assignment
0 Petitions
Accused Products
Abstract
An electric hotplate (11) has a metal plate-like or inverted dish-shaped circular hotplate member (12) against whose bottom are pressed by spring elements (25) thin flexible tubular heaters (31), while interposing a multilayer insulation (28). A support disk (26) is placed between insulation (28) and spring elements (25). According to a variant a reinforcement is provided, which may also be placed between the insulation and the tubular heaters. The electric hotplate has a low heat storing capacity and a very flat upper cooking surface (32), even under operating conditions.
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Citations
35 Claims
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1. An electric hotplate having a metal hotplate member with, in the heated area, an upper, substantially closed planar cooking surface and a smooth, unribbed bottom surface, at least one tubular heater embedded in electrically insulating material and having a flat surface for engaging the bottom surface of the hotplate member and a base plate connected to the hotplate member and enclosing the at least one tubular heater, the hotplate comprising:
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at least one spring element supported between the at least one tubular heater and base plate for resiliently pressing the the least one tubular heater against the bottom surface of the hotplate member; a heat-resistant insulation layer interposed between the spring member and the at least one tubular heater; the tubular heater being thin and flexible, and so arranged as to define an unheated central area; the hotplate member having a thermostat opening in the central area, surrounded by a downwardly directed inner rim; and
,a thermostat support sleeve press-fitted in the thermostat opening defining an annular enclosure for the at least one tubular heater, the base plate being connected to the support sleeve in the central area whereby heat conduction to the cooking surface is enhanced and energy losses due to thermal inertia are reduced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An electric hotplate having a metal hotplate member with, in the heated area, an upper, substantially closed planar cooking surface and a smooth, unribbed bottom surface, at least one tubular heater embedded in electrically insulating material and having a flat surface for engaging the bottom surface of the hotplate member and a base plate connected to the hotplate member and enclosing the at least one tubular heater, the electric hotplate comprising:
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the hotplate member having an outer rim directed substantially perpendicularly downwardly from the cooking surface, the base plate resting against the lower edge of the outer rim and being centered thereon; a compressible heat-resistant insulation layer interposed between the at least one tubular heater and the base plate; at least one spring element supported by and between the insulation layer and the base plate for resiliently pressing the at least one tubular heater against the bottom surface of the hotplate member, the at least one spring element having an elongation characteristic which exceeds the permanent deformation of the insulation layer; and
,the tubular heater being thin and flexible, whereby heat reduction to the cooking surface is enhanced and energy losses due to thermal inertia are reduced. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. An electric hotplate having a metal hotplate member with, in the heated area, an upper, substantially closed, planar cooking surface and a smooth, unribbed bottom surface, at least one tubular heater embedded in electrically insulating material and having a flat surface for engaging the bottom surface of the hotplate member and a base plate connected to the hotplate member and enclosing the at least one tubular heater, the electric hotplate comprising:
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the hotplate member having an outer rim directed substantially perpendicularly downwardly from the cooking surface, the base plate resting against the lower edge of the outer rim and being centered thereon; at least one spring element supported between the at least one tubular heater and the base plate for resiliently pressing the tubular heater against the bottom surface of the hotplate member; a heat-resistant insulation layer interposed between the spring member and the at least one tubular heater; the tubular heater being thin and flexible, whereby heat conduction to the cooking surface is enhanced and energy losses due to thermal inertia are reduced; and
,temperature limiting means disposed immediately adjacent the bottom of the at least one tubular heater, for interrupting power to the at least one tubular heater when a predetermined temperature is exceeded, whereby the operating temperature of the electric hotplate may be very precisely monitored and controlled.
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Specification