초록 ▼

A coffee maker including a brewing and warming unit and a carafe, wherein the carafe has a hot plate at the bottom, and a downward annular flange raised from the bottom around the hot plate for supporting the carafe on a table top; the brewing and warming unit includes a base having a heat insulatin

A coffee maker including a brewing and warming unit and a carafe, wherein the carafe has a hot plate at the bottom, and a downward annular flange raised from the bottom around the hot plate for supporting the carafe on a table top; the brewing and warming unit includes a base having a heat insulating rack and a concave heat insulating plate mounted within the heat insulating rack to hold a heating plate for heating the carafe, a lever controlled micro switch which is switched on when the carafe is placed on the heating plate or switched off when the carafe is removed from the heating plate, a first sensor which detects the temperature of the carafe, a second sensor which detects the temperature of the heating plate, and a control circuit driven by the micro switch to control the power of the heating plate subject to the detection result of the first sensor and the second sensor.

대표청구항 ▼

[ What the invention claimed is:] [1.] A coffee maker comprising a carafe having a hot plate at a bottom side thereof on the outside and a downward annular flange raised from the bottom side around said hot plate, and a brewing and warming unit, wherein said brewing and warming unit comprises:a base

[ What the invention claimed is:] [1.] A coffee maker comprising a carafe having a hot plate at a bottom side thereof on the outside and a downward annular flange raised from the bottom side around said hot plate, and a brewing and warming unit, wherein said brewing and warming unit comprises:a base, an annular heat insulating rack raised from said base and defining a plurality of head dissipating holes, a concave heat insulating plate mounted within said heat insulating rack and fitting the curvature of the bottom side of said carafe and having a center opening, a mounting plate fixedly mounted inside said base below the center opening of said heat insulating plate, a heating plate fixedly fastened to said mounting plate covered on the center opening of said heat insulating plate and having an electric heating coil on the inside controlled to produce heat for heating said carafe, a heating coil driving circuit controlled to drive said electric heating coil, a heating plate heat sensor fastened to said heating plate to detect its temperature, a detecting mechanism spaced from said mounting plate, and a control panel at one side of said base, said detecting mechanism comprising a substantially conical lever, an aluminum tube coupled to said lever which is disposed in contact with said carafe when said carafe is placed on said heating plate, a carafe heat sensor mounted within said aluminum tube and adapted for detecting the temperature of said carafe, a spring element mounted inside said base, a rocker arm turned about an axis inside said base and forced by the spring element into contact with a bottom side of said lever, a micro switch disposed in contact with one end of said rocker arm, and a control circuit mounted inside said control panel and connected to said micro switch, said control panel comprising an on/off switch for power control, a power indicator lamp, a brewing indicator lamp and an auto-warming indicator lamp respectively connected to said control circuit, said micro switch being triggered to drive said control circuit when said carafe is placed on said heating plate to move the lever of said detecting mechanism, said control circuit being driven by said micro switch to control the power of said photo coupling switch and said electric heating coil subject to the detection result of said carafe heat sensor and said heating plate heat sensor.