| 摘要 |
<p>PURPOSE:To surely prevent no-water burning from occurring by a method wherein the principle of siphon in a coffee-maker is applied. CONSTITUTION:An electric heat generating body 2 is provided on the inner bottom of a vessel main body 1 composed of non-magnetic material. A cylindrical bubble reservoir 3 is communicated through a communicating hole 4 provided on the lower part of a partition wall 31 to the interior of the vessel main body 1. A bubble guide plate 5, which has a plane figure diverging towards the center of the vessel main body 1 (such as a spalula-shape) and at the outer peripheral edges of which downward collars 51 are provided, is arranged with a slightly descending inclination at the upper edge side of the communicating hole 4. In addition, a bubble vent hole 6 with a size necessary for communicating the bubble reservoir 3 with the interior of the vessel main body 1 is provided on the upper part of the partition wall 31. A float 7, onto the top surface of which a planar magnetic material 8 is fixed, is loosely inserted in the bubble reservoir 3. A permanent magnet 9 fixed onto a holder 10 is installed through a coiled spring 11 on the top surface side of the upper wall 32 of the bubble reservoir 3. An annular insulating sheet 16, onto which a fixed contact 17 and a movable contact plate 18 are installed, is provided at the intermediate part of a cover 15.</p> |
