JPH02293539A - Electric hotplate - Google Patents

Abstract

PURPOSE:To obtain an electric hotplate in which a heater is not reenergized by inhibiting to start a timer circuit if a controller is temporarily deenergized during operation and again energized. CONSTITUTION:When a control knob 8 is pressed and turned, a controller 7 starts operating, a timer starter 12 is energized, and the starter 12 completes preparation for starting. When the knob 8 is further turned, a protrusion 8 presses a switch lever 14, the contact of a start switch 13 is switched to start the starter 12, thereby supplying a current to a timer circuit 10. The circuit 10 is started to close the contact of a relay 11, thereby energizing a heater 6. If the energization is temporarily stopped due to an electric interruption, etc. the circuit 10 is reset and then again energized, the contact of the switch 13 remains switched, the starter 12 is energized, and the starter 12 cannot be started. Accordingly, the circuit 10 is not started, the contact of the relay 11 remains opened, and the heater 6 is not energized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the starting of a timer circuit for preventing forgetting to turn off an electric stove used in a general household.

BACKGROUND OF THE INVENTION Conventionally, this type of electric stove has had a configuration as shown in FIG. That is, when the controller 1 is turned on, electricity is supplied to the timer circuit 2 and one side of the heater 3 is energized, and then the contacts of the relay 4 are closed and the heater 3 is energized. After a certain period of time has elapsed, the timer circuit 2 operates, the contacts of the relay 4 open, and the power supply to the heater 3 is stopped.

If the heater 30 is to be turned off before a certain period of time has elapsed, the controller 1 is turned off to stop supplying electricity to the timer circuit 2 and at the same time de-energize one side of the heater 30.

Problems to be Solved by the Invention However, with this configuration, when the power is on or when the timer circuit 2 is operating and the contacts of the relay 4 are open,
If the power is turned off for a certain period of time due to a power outage or the like and then turned on again, the timer circuit 2 is reset and the heater 3 is energized again for a certain period of time, which is dangerous.

Therefore, the present invention prevents the timer circuit from starting in the event that power is temporarily stopped due to a power outage or the like while the controller is in operation, and then the power is turned on again. The purpose is to obtain.

Means for Solving the Problems To achieve the objects, the present invention provides a protrusion on the lower surface of a control knob for operating a controller, a timer circuit, a timer starting circuit for starting the timer circuit, and a timer starting circuit for starting the timer starting circuit. Install a start switch. The activation switch uses the push and turn of the control knob and the protrusion on the bottom of the control knob to switch the contacts after the controller is activated.

Operation The electric stove of the present invention has the above-mentioned configuration, whereby the control knob is pushed and turned to operate the controller, the timer starting circuit is first energized, preparation for starting the timer starting circuit is completed, and then the control knob is rotated. When the contact point of the start switch is switched using the protrusion provided on the bottom of the control knob, the timer start circuit supplies electricity to the timer circuit and starts the timer circuit. When the timer circuit starts, the relay contacts close and the heater is energized. If power is temporarily stopped due to a power outage, etc., and the timer circuit is reset and then turned on again, the contacts of the start switch may remain switched before the timer start circuit is ready to start. Therefore, the timer starting circuit does not supply electricity to the timer circuit, and since the timer circuit does not start, the heater will not be energized.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 to 4, 5 is a stove body, 6 is a heater placed on the top of the stove body 6, 7 is a controller for controlling the heater 6, and 8 is a controller 7 that can be pushed and turned. There is a protrusion 9 on one side with a control knob that operates the
is provided. 1o is a timer circuit, and 11 is a relay that opens and closes in response to a signal from the timer circuit 10. 12 is a timer starting circuit that starts the timer circuit 11 by supplying electricity; 13 is a starting switch that starts the timer starting circuit 12 by switching contacts after the timer starting circuit 12 has completed preparations for starting; 14 is a control This is a switch lever that transmits the movement of the knob to the activation switch. 16 is a display board that covers the front surface of the controller 7.

Next, the operation of the configuration of this embodiment will be explained. First, when the control knob 8 is pushed and turned, the controller 7 starts operating and the timer starting circuit 12 is energized.
is ready for startup. When the control knob 8 is further turned, the protrusion 9 provided on one side of the control knob 8 moves to the switch lever 1.
4 to the position where the switch lever 14 is pushed down, and the contact of the start switch 13 is switched by the movement of the switch lever 14, the timer start circuit 12 is started, and electricity is supplied to the timer circuit 1o.

The timer circuit 1o supplied with electricity starts and relay 11
The contact is closed and the heater 6 is energized.

At this time, if the power supply is temporarily stopped due to a power outage, etc., and the timer circuit 1o is reset and then energized again, the timer start circuit 12 is energized while the contacts of the start switch 13 remain switched. In particular, since the timer starting circuit 12 cannot be started, the timer circuit 1o is not supplied with electricity, so it does not start, and the contacts of the relay 11 also remain open, and the heater 6 is not energized. To energize the heater 6 again, turn the control knob 8 to return the contacts of the start switch 13 to their original positions to prepare for starting the timer start circuit 12, then turn the control knob 8 again to switch the start switch 1 to its original position.
By switching the contacts of 3, the timer starting circuit 1
2, supplies electricity to the timer circuit 10, starts the timer circuit 10, closes the contact of the relay 11, and energizes the heater 6.

Effects of the Invention As described above, the present invention provides a timer starting circuit for starting a timer circuit and a starting switch for starting the timer starting circuit, and uses the starting switch and a protrusion provided on the lower surface of the control knob to Determines whether the controller is operating or not, and if the controller is operating and power is temporarily stopped due to a power outage, etc., and the timer circuit is reset and then energized again, the timer start circuit Since the heater is not activated, the timer circuit will not start and the heater will be energized again, making it safe.

[Brief explanation of the drawing]

Fig. 1 is a block circuit diagram showing an electric stove according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the same essential parts, Fig. 3 is a perspective view of the same, and Fig. 4 is a partial top view of the drowsy stove. FIG. 6 is a block circuit diagram of a conventional electric stove. 5...Stove body, 6...Heater,
7...Controller, 8...Control knob, 9
...Protrusion, 10...Timer circuit. 1
1...Relay, 12...Timer starting circuit, 13...Starting switch. Name of agent: Patent attorney Shigetaka Awano and one other personε.
．． ．． Beater 7 I Shago To 9 I 7- Po Daisara i + Iil Road q---';ill-

Claims (1)

[Claims] A stove body, a heater placed on the top of the stove body, a controller for controlling the heater, a control knob for operating the controller, a protrusion provided on the lower surface of the control knob, and a timer circuit. , a relay whose contacts open and close in response to a signal from the timer circuit, a timer starting circuit that starts the timer circuit, and a starting switch that starts the timer starting circuit by switching contacts, and the starting switch is configured to control the control. An electric stove that switches after the appliance is activated.