Hot plate, and hob having a hot plate

Abstract

A hot plate has a hot-plate body from metal, having an upper side and a lower side. At least one heating element is disposed on the lower side of the hot-plate body. The upper side of the hot-plate body is configured so as to be flat, for setting up a cooking vessel to be heated. The upper side of the hot-plate body in an external region has an encircling planar region which lies in a plane, or which forms a plane, respectively, wherein the upper side, radially within the planar region, has at least one internal region which is concavely depressed, which in relation to the planar region is depressed by between 0.05 mm and 1 mm.

That which is claimed: 
     
         1 . A hot plate comprising:
 a hot-plate body, wherein:
 said hot-plate body has an upper side and a lower side; 
 said hot-plate body is composed of metal; 
 at least one heating element is disposed on said lower side of said hot-plate body; 
 said upper side of said hot-plate body is configured so as to be flat, for setting up a cooking vessel to be heated; 
 said upper side of said hot-plate body comprises an external region in which an encircling planar region is provided, said encircling planar region lying in a plane or forming a plane, respectively; and 
 said upper side, radially within said planar region, comprises at least one internal region being concavely depressed. 
   
     
     
         2 . The hot plate according to  claim 1 , wherein said hot-plate body is composed of cast iron. 
     
     
         3 . The hot plate according to  claim 1 , wherein said planar region is spaced apart from an external edge of said hot plate having a maximum radial extent by a maximum of 5% of a radius of said hot-plate body, wherein only an oblique and sharply downward chamfered hot-plate periphery, radially outside said planar region, encircles said planar region. 
     
     
         4 . The hot plate according to  claim 1 , wherein said encircling planar region comprises a width of 1 mm to 30 mm. 
     
     
         5 . The hot plate according to  claim 1 , wherein said encircling planar region comprises a width of 3 mm to 10 mm.  6 . The hot plate according to  claim 1 , wherein said encircling planar region comprises a width between 1% and 20% of a radius of said hot-plate body. 
     
     
         7 . The hot plate according to claim  6 , wherein said encircling planar region comprises a width between 3% and 10% of a radius of said hot-plate body. 
     
     
         8 . The hot plate according to  claim 1 , wherein said encircling planar region comprises a consistent width. 
     
     
         9 . The hot plate according to  claim 1 , wherein said internal region is concavely depressed, said concavity comprising a shape or curvature, respectively, of a cone or of an arc. 
     
     
         10 . The hot plate according to  claim 9 , wherein said internal region comprises a single concave depression. 
     
     
         11 . The hot plate according to  claim 10 , wherein a maximum depth of said concave depression below said encircling planar region is 0.05 mm to 1 mm. 
     
     
         12 . The hot plate according to  claim 9 , wherein, in a central region of said internal region, a central zone that in relation to said concave depression is yet again depressed and that comprises a depth between 0.3 mm to 3 mm below said encircling planar region is provided. 
     
     
         13 . The hot plate according to  claim 12 , wherein a maximum depth of said concave depression of said internal region below said encircling planar region is 0.05 mm to 1 mm. 
     
     
         14 . The hot plate according to  claim 13 , wherein said depressed central zone is concavely curved, having a more intense curvature than a curvature of said internal region. 
     
     
         15 . The hot plate according to  claim 12 , wherein no heating elements are provided below or opposite said depressed central zone, respectively, on a lower side of said hot plate. 
     
     
         16 . A hob having at least one hot plate according to  claim 1 , wherein:
 said hob comprises a hob plate comprising a hot-plate opening in said hob plate into which said hot plate is inserted, said hot plate by way of a laterally projecting periphery of said upper side of said hot-plate body projecting beyond said hot-plate opening, wherein for fastening said hot plate to said hob, a counterbearing is attached to said hot plate from below and in a central region is fastened or screwed to said hot plate; and   said counterbearing engages across said hot-plate opening and bears on said lower side of said hob plate at least three bearing points, said bearing points being mutually spaced apart by an arc angle of at least 45°.   
     
     
         17 . The hob according to  claim 16 , wherein said counterbearing is configured so as to be cruciform, comprising at least three arms that emanate from a center. 
     
     
         18 . The hob according to  claim 17 , wherein said arms are mutually equiangular. 
     
     
         19 . The hob according to  claim 16 , wherein said counterbearing comprises a shape of a curved disc and a central region, wherein said counterbearing in said central area is connected to said hot plate, and in an external region largely bears on said lower side of said hob plate. 
     
     
         20 . The hob according to  claim 19 , wherein said counterbearing comprises an opening for an electrical connector to said hot plate. 
     
     
         21 . The hob according to  claim 16 , wherein said hob comprises a hob plate from metal or stainless steel, respectively. 
     
     
         22 . A hob comprising:
 at least one hot plate comprising a hot-plate body, wherein:
 said hot-plate body comprises an upper side and a lower side; 
 said hot-plate body is composed of metal; 
 at least one heating element is disposed on said lower side of said hot-plate body; 
 said upper side of said hot-plate body is configured so as to be flat, for setting up a cooking vessel to be heated; 
 said hob comprises a hob plate comprising a hot-plate opening into which said hot plate is inserted; 
 said hot plate by way of a laterally projecting periphery of said upper side of said hot-plate body projecting beyond said hot-plate opening; 
 for fastening said hot plate to said hob, a counterbearing is attached to said hot plate from below and is centrically fastened or screwed to said hot plate; 
 said counterbearing engages across said hot-plate opening and bears on said lower side of said hob plate at least three bearing points; and 
 said bearing points being mutually spaced apart by an arc angle of at least 45°. 
   
     
     
         23 . The hob according to  claim 22 , wherein said counterbearing comprises a shape of a curved disc, and in a central region is connected to said hot plate, and in an external region largely bears on the lower side of the hob plate. 
     
     
         24 . The hob according to  claim 23 , wherein said counterbearing in said external region in a completely encircling manner bears on said lower side of said hob plate.