Patent ID: 6353211
Filing Date: 2002-03-05
Classification: H05B

Abstract:
An electric heating device comprising:a heating member formed as a flexible sheet with opposite first and second end portions, said heating member including upper and lower dielectric layers and an electric heating film layer which is disposed between said upper and lower dielectric layers and which is adapted to generate heat when supplied with electric power; a closure unit provided on said first and second end portions of said heating member for connecting said first and second end portions to each other so as to form said heating member into a tubular body and so as to retain a tubular shape of said heating member; and an electric wire unit having a first end extending into said heating member and connected electrically to said electric heating film layer and a second end opposite to said first end and adapted to be connected electrically to an electric power source, wherein said closure unit includes an elongated connecting block which is secured to said first end portion of said heating member and which is formed with a longitudinal slot that permits said second end portion of said heating member to extend therethrough so as to form said heating member into said tubular body, said second end portion of said heating member being slidable relative to said connecting block so as to permit adjustment of diameter of said tubular body, said closure unit further including a stop member secured to said second end portion of said heating member to prevent removal of said second end portion from said connecting block.