| 摘要 |
PURPOSE:To provide an electric stove, the warmth developed by which is comfortable, the efficiency of which is very high and the electric power consumption of which is small, by a structure wherein a circuit to control the revolution speed of the motor of a fan and a timer to make and break a circuit to energize the motor are connected to the motor of the fan. CONSTITUTION:The motor M of a fan 13, a circuit, which consists of a rotary switch RS and resistors R1 and R2 in order to control the revolution speed of the motor M, and a timer T1 are connected in series through a switch SW1 to a power supply AC. The rotary switch RS interlinks with the rotation of an output change-over dial. In concrete structure, when the dial is set at a ''very weak'' output position, a movable contact piece (p) contacts with a terminal (a) and the energizing circuit of the motor M is cut-off. When the dial is set at ''weak'' output position, the piece (p) contacts with a terminal (b) and the power supply AC is connected through series resistors R1 and R2 to the motor M. When the dial is set at a ''medium'' output position, the piece (p) contacts with a terminal (c) and the power supply AC is connected through the resistor R2 to the motor M. When the dial is set at a ''strong'' output position, the piece (p) contacts with a terminal (d) and the power supply AC is connected directly to the motor M. When a time is set by a timer dial, a timer T1 is so constituted that the nonconducting state is at first produced between terminals (e) and (f) and, after the arrival of set time, the conducting state is established between the terminals (e) and (f) or the timer T1 is connected in order to make and break a circuit to energize the motor M. |
