Abstract:
The present invention relates to an electric roasting plate which comprises a roasting board, a heating coil laminated together with said roasting board. The shape and size of the heating area of the heating coil matches with the grilling area of the roasting board, so as to grill food well and to eliminate the possibility of distortion of the roasting board, and to lengthen the service life of the heating coil. It overcomes the shortages of the uneven temperature of the roasting board of the quadrate or other non round electric roasting plates and the short service life of the conventional heating coil.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to a cooking apparatus, especially relates to a cooking apparatus which applies electric energy to grill food. 
       BACKGROUND OF THE INVENTION 
       [0002]    The conventional electric roasting plate as showed in  FIG. 1 , the back surface of the central part of the accidented grilling area of roasting board  1 ′ is laminated with the heating coil  2 ′. Generally, the roasting board  1 ′ is quadrate or other non round shapes, however, the heating coil  2 ′ is round. So the heating coil  2 ′ can only directly heat the round area of the center of the grilling area of roasting board  1 ′ which is above the heating coil  2 ′, the remaining grilling area of roasting board  1 ′ has to rely on the heat conduction to raise its temperature, so the temperature will be relatively low. The heating area is concentrated on the center of the grilling area of roasting board  1 ′, so the grilled food will not be heated evenly, the doneness of the food will not be even. In such a roasting plate, the round area of the central part of the roasting board  1 ′ will easily warps to distortion because of the uneven heating, further, because the heat is concentrated on the heating coil  2 ′, so the temperature will be relatively high, the service life of the heating coil  2 ′ will be short. 
       SUMMARY OF THE INVENTION 
       [0003]    The objective of the present invention is to provide an electric roasting plate, its roasting board is quadrate or other non round shapes, but the temperature of the roasting plate is even and the service life of the heating coil is relatively long. 
         [0004]    The technical solution applied by the present invention is: an electric roasting plate, comprising a roasting board and a heating coil which are laminated together, characterizes in that the shape and size of the heating area of the heating coil matches with the grilling area of the roasting board. 
         [0005]    The shape of the heating area of said heating coil is rectangle or oval or polygon. 
         [0006]    The electric heating wires of the heating area of said heating coil are arranged uniformly. 
         [0007]    The electric roasting plate of the present invention is by improving the shape and size of the heating area of the heating coil, makes the heating coil match with the grilling area of the roasting board, so the food will be grilled well, the doneness of the food will be even, and it will eliminate the possibility of the distortion of the roasting board, and it will lengthen the service life of the heating coil. The shape of the heating area of the heating coil is rectangle or oval or polygon, because the perimeters of such shapes are respectively longer than the perimeter of the round shape with the same size, so the distribution density of the electric heating wires in the heating area of the heating coil of such shapes are respectively lower than that of the round heating area when the electric power is the same (the length of the electric heating wire is the same), the temperature of the heating coil of such shapes is relatively low, so the service life of the will be lengthened. The shape of the heating area of the heating coil is rectangle or oval or polygon, so the heating will be more even when applied in different shapes of the grilling area of various kinds of roasting plates, so more different grilling area shapes can be selected. The electric heating wires are arranged uniformly in the heating area of the heating coil, so the temperature of the grilling area of the roasting plate will be more even. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]      FIG. 1  is the structural view of the conventional electric roasting plate. 
           [0009]      FIG. 2  is the structural view of an embodiment of the electric roasting plate of the present invention. 
           [0010]      FIG. 3  is the unfolded structural view of the embodiment of  FIG. 2 . 
           [0011]      FIG. 4  is the structural view of an upper roasting board of an electric grilling device which applies the electric roasting plate of the present invention. 
           [0012]      FIG. 5  is the structural view of an upper heating coil of the electric grilling device as indicated in  FIG. 4 . 
           [0013]      FIG. 6  is the unfolded structural view of an upper shell of the electric grilling device as indicated in  FIG. 4 . 
           [0014]      FIG. 7  is the structural view of a lower roasting board of the electric grilling device as indicated in  FIG. 4 . 
           [0015]      FIG. 8  is the structural view of a lower heating coil of the electric grilling device as indicated in  FIG. 4 . 
           [0016]      FIG. 9  is the unfolded structural view of a lower shell of the electric grilling device as indicated in  FIG. 4 . 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0017]    Firstly, Embodiment 1 
         [0018]    The structure of an embodiment of the electric roasting plate of the present invention as showed in  FIG. 2 . The roasting board  1  and the heating coil  2  of said electric heating roasting plate are laminated together. The shape of the heating area of the heating coil  2  is quadrate, the size of the heating area of the heating coil  2  matches with the quadrate grilling area of roasting board  1 . 
         [0019]    The unfolded structure of said electric roasting plate is showed in  FIG. 3 : the roasting board  1  is quadrate, its front end is an end surface  11  which bends downwardly. The roasting board  1  extends from the front end to the back end to form an accidented quadrate grilling area. The left and right sides of roasting board are respectively disposed with a handle  13 . 
         [0020]    The skeleton  21  of the heating coil  2  is quadrate, its four corners are respectively disposed with an installing hole  211 , so as to be connected to the roasting board  1 . The inside of the skeleton  21  has several hollowed-cuts, so multiple symmetrically disposed supporting strips are formed. Those supporting strips form a quadrate heating area. Each supporting strip has a wire slot, the electric heating wire  22  are uniformly distributed and warped in the wire slots of said supporting strips, so a quadrate heating surface is formed. The size of said heating surface matches with the quadrate grilling area  12  of roasting board  1 . The wiring of the electric heating wire  22  in the quadrate heating coil  2  is relatively sparse, so the temperature of the heating coil  2  would not be too high, so it will reduce the possibility of the burning-out of the heating coil  2 . 
         [0021]    Certainly, the shape of the heating area of the heating coil  2  can also be rectangle or oval or polygon; so as to match with the rectangle or oval or polygon grilling area of roasting board  1 , so the food of the roasting board  1  can be evenly heated, so the roasting board  1  is heated evenly and not likely to deform. 
         [0022]    Secondly, Embodiment 2 
         [0023]    An unfolded structure of the electric grilling device which applies the electric roasting plate of the present invention, as showed in  FIG. 4  to  FIG. 9 . Said electric grilling device comprises upper roasting board  10 \ upper heating coil  20 \ upper panel  301 \ upper shell  30 \ upper separating board  302 \ lower roasting board  40 \ lower heating coil  50 \ lower separating board  601 \ lower shell  60 \ lower left hinge  602 \ upper left  603 \ lower right hinge  604  and upper right hinge  605  and other components, they cooperate with each other to respectively form upper roasting plate\ upper shell body which supports the upper roasting plate\ lower roasting plate\ lower shell body which supports the lower roasting plate\ hinge unit which connects the upper shell body and the lower shell body. 
         [0024]    Please refer to  FIG. 4 : the upper roasting board  10  is rectangle, its front end is an end surface  101  which bends upwardly. The upper roasting board  10  extends from the front end to the back end to form an accidented rectangle grilling area  102 . The left and right sides of the upper roasting board  10  respectively disposed with two retaining bosses  103  which project downwardly and two installing holes  104 . 
         [0025]    Please refer to  FIG. 5 : the skeleton  201  of the upper heating coil  20  is rectangle, its four corners are respectively disposed with an installing hole  2011 . The inside of the skeleton  201  has several hollowed-cuts, so multiple symmetrically arranged supporting strips  2012  are formed. Those supporting strips  2012  form a rectangle heating area. Each supporting strip has a wire slot, the electric heating wires  202  are uniformly distributed and warped in the wire slots of those supporting strips  2012 , so a rectangle heating surface is formed. The size of said heating surface matches with the rectangle grilling area  102  of upper roasting board  10 . The two terminals  203  of electric heating wire  202  are led out. 
         [0026]    Please refer to  FIG. 6 : the upper shell  30  in the upper shell body of said electric grilling device is a rectangle box body which has a downward opening, a quadrate upper panel  301  covers the upper end surface  3001  of the upper shell  30 . The back part of the left and right sides of upper shell  30  are respectively disposed with a lug  3002 , so it will be convenient to install the corresponding upper hinge  603 \ 605 . 
         [0027]    The upper separating board  302  of upper shell body is rectangle, its front end is the end surface  3021  which bends upwardly. The upper separating board  302  has a rectangle sunken area  3022  which corresponds to the upper heating coil  20 . The left and right sides of the upper separating board  302  are respectively disposed with two retaining bosses  3023  which project downwardly and two installing holes  3024 . The periphery of the upper separating board  302  has pluralities of via  3025 . 
         [0028]    The four screws respectively go through the installing holes  2011  of the four corners of the upper heating coil  20 , so the upper heating coil  20  is fixed in the upper shell  30 . The upper separating board  302  covers the upper heating coil  20  from below, so the upper heating coil  20  locates in the sunken area  3022  of the upper separating board  302 . Multiple screws respectively go through the via  3025  on the periphery of the upper separating board  302 , so the upper separating board  302  is fixed beneath the upper shell  30 . The upper roasting board  10  fastens on the lower surface of the upper separating board  302 , the end surface  101  of upper roasting board  10  contacts the end surface  3021  of the upper separating board  302 , the retaining bosses  103  by the left and right sides of the upper roasting board  10  are clamped in the retaining bosses  3023  corresponding to the upper separating board  302 . The four screws respectively go through the installing hole  104  of the upper roasting board  10  and the installing hole  3024  of the upper separating board  302 , so the upper roasting board  10  is fixed on the upper shell  30 . Thus, the upper roasting plate formed by the upper roasting plate  10  and the upper heating coil  20  is fixed on the upper shell body. So it will be convenient for the consumer take off the upper roasting board  10  for cleansing because of the protection of the upper separating board  302  to the heating coil  20 . 
         [0029]    Please refer to  FIG. 7 : the lower roasting board  40  is rectangle, its front end is an end surface  401  which bends upwardly. The lower roasting board  40  extends from the front end to the back end to form an accidented rectangle grilling area  402 . The left and right sides of the lower roasting board  40  respectively disposed with two retaining bosses  403  which project downwardly and two installing holes  404 . 
         [0030]    Please refer to  FIG. 8 : the skeleton  501  of the lower heating coil  50  is rectangle, its four corners are respectively disposed with an installing hole  5011 . The inside of the skeleton  501  has several hollowed-cuts, so multiple symmetrically disposed supporting strips are formed. Those supporting strips form a rectangle heating area. Each supporting strip has a wire slot, the electric heating wire  502  uniformly disposed and warped in the wire slots of the supporting strips, so a rectangle heating surface is formed. The size of said heating surface matches with the rectangle grilling area  402  of the lower roasting board  40 . The two terminals  503  of the electric heating wire  502  are led out. 
         [0031]    Please refer to  FIG. 9 : the lower shell  60  of the lower shell body of said electric grilling device is a rectangle box body which has an upward opening. The left and right sides of the back part of lower shell  60  respectively has a sunken part  6001 , so as to install the corresponding lower hinge  602 \ 604 . The inside of the lower shell  60  is peripherally disposed with several projecting posts  6005 , each of which has a screw hole on its top. 
         [0032]    The lower separating board  601  of the lower shell body is rectangle, its front end is an end surface  6011  which bends downwardly. The lower separating board  601  has a rectangle top protruding area  6012  corresponding to the lower heating coil  50 . The left and right sides of lower separating board  601  are respectively disposed with two retaining bosses  6013  which project downwardly and two installing holes  6014 . The periphery of the lower separating board  601  has several via  6015 . 
         [0033]    The four screws respectively go through the installing holes  5011  of the four corners of lower heating coil  50 , so the lower heating coil  50  is fixed inside the lower shell  60 . The lower separating board  601  covers the lower heating coil  50  from above, so the lower heating coil  50  is located in the top protruding area  6012  of the lower separating board  601 . Multiple screws respectively go through the via  6015  on the periphery of the lower separating board  601  and locked in the screw hole of the projecting post  6005  corresponding to the lower shell  60 , so the lower separating board  601  is fixed upon the lower shell  60 . The lower roasting board  40  fastens on the top surface of the lower separating board  601 , the end surface  401  of lower roasting board  40  contacts the end surface  6011  of the lower separating board  601 , the retaining bosses  403  by the left and right sides of the lower roasting board  40  are clamped with the retaining bosses  6013  corresponding to the lower separating board  601 . The four screws respectively go through the installing holes  404  of the lower roasting board  40  and the installing holes  6014  of the lower separating board  601 , so the lower roasting board  40  is fixed on the lower shell  60 . Thereby, the lower roasting plate formed by the lower roasting board  40  and lower heating coil  50  is fixed upon the lower shell body. So it would be convenient for the consumer to take off the lower roasting board  40  for cleansing because of the protection of the lower separating board  601  to the lower heating coil  50 . 
         [0034]    The lower end  6022  of the lower left hinge  602  of the hinge unit is fixed in a sunken part  6001  by the left side of the lower shell  60 , the transverse shaft on the top end of lower left hinge  602  is inserted into the shaft sleeve  6031  on the back end of the upper left hinge  603 . The front end  6032  of the lower left hinge  603  is fixed on the lug  3002  by the left side of the upper shell  30 . The lower end  604  of the lower right hinge  604  is fixed on the sunken part  6001  by the right side of the lower shell  60 . The transverse shaft on the upper end of the lower right hinge  604  is inserted into the shaft sleeve  6051  on the back end of the upper right hinge  605 . The front end  6052  of the upper right hinge  605  is fixed on the lug  3002  by the right side of the upper shell  30 . The upper shell body rotates relative to the lower shell body by the hinge unit. 
         [0035]    Although the present invention has been described with reference to the preferred embodiments thereof for carrying out the invention, it is apparent to those skilled in the art that a variety of modifications and changes may be made without departing from the scope of the present invention which is intended to be defined by the appended claims.