| 摘要 |
PURPOSE:To remove the danger of a fire and to save power by providing a temperature detecting portion for detecting that the inner part of the foot warmer keeps the same temperature continuously for a predetermined period of time. CONSTITUTION:The temperature detecting portion 11 detects the temperature of a draft from a bypass air passage 9 to detect the temperature of the inner part of the foot warmer. When this temperature continues an isothermal state for a predetermined period of time, the power source is OFF, and the OFF state is kept on. When a person enters into the foot warmer, a gap between a quilt 12 and the floor changes in accordance with the robbing of heat by the person and the movement of the person, and hence cool air enters the foot warmer. Thus, the temperature change occurs frequently. For this reason, the temperature state within the foot warmer differs depending upon the presence or absence of the person. Therefore, in a case where no person is present, the temperature reaches a predetermined temperature and a predetermined time passes, the temperature detecting part 11 detects it. By turning off the power source and holding the OFF state, the safety of the foot warmer and power saving can be performed. |
