Patent ID: 6222989
Filing Date: 2001-04-24
Classification: A01M

Abstract:
A fumigation type control device for scattering agricultural chemicals comprising:a first heating element having a constant resistance value regardless of variation of its temperature and generating heat in response to a current flowing therethrough at an initial power-on stage;a second hearing element for generating heat connected in series to said first heating element, and having a resistance value increasing in accordance with its temperature, wherein the first heating element has a higher resistance than that of the second heating element at a normal temperature to reduce at least by one-half the current flowing therethrough at the initial power-on stage in comparison to current flowing without the first heating element;a storage tank for storing therein said agricultural chemicals to be fumigated and heating said stored agricultural chemicals by heat generated from said first and second heating elements; anda heated plate provided under the bottom of the storage tank to heat the storage tank, wherein said first and second heating elements are in continuous heat communication with the bottom surface of the heated plate so that the plate is heated by the heat produced from the first and second heating elements and the second heating element is heated by the first heating element.