CA2193533A1 - Fire prevention device for electric cooking stove - Google Patents
Fire prevention device for electric cooking stoveInfo
- Publication number
- CA2193533A1 CA2193533A1 CA 2193533 CA2193533A CA2193533A1 CA 2193533 A1 CA2193533 A1 CA 2193533A1 CA 2193533 CA2193533 CA 2193533 CA 2193533 A CA2193533 A CA 2193533A CA 2193533 A1 CA2193533 A1 CA 2193533A1
- Authority
- CA
- Canada
- Prior art keywords
- stove
- oven
- burners
- relay
- time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0258—For cooking
- H05B1/0261—For cooking of food
- H05B1/0266—Cooktops
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/08—Arrangement or mounting of control or safety devices
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electric Stoves And Ranges (AREA)
Abstract
It is, therefore a particular object of the present invention to provide the means of reducing cooking related fire hazards without comprising usability of electric stoves.
The present invention is designed to automatically shut down the burners of electrical stove if the stove is left unattended for longer than a preprogrammed period of time. A
combination of a programmable timing device and a motion sensor is used for this purpose. The motion sensor monitors any human movements in the surroundings of the stove. Should the motion sensor detect any inactivity in the immediate surroundings of the stove, the timing relay is activated to cut OFF the power supply to the stove burners after a preprogrammed period of time elapses. In the case that the motion sensor detects human movements around the stove, the device will turn ON the stove' s burners again until another period of inactivity is detected and the cycle will be repeated.
The present invention is designed to automatically shut down the burners of electrical stove if the stove is left unattended for longer than a preprogrammed period of time. A
combination of a programmable timing device and a motion sensor is used for this purpose. The motion sensor monitors any human movements in the surroundings of the stove. Should the motion sensor detect any inactivity in the immediate surroundings of the stove, the timing relay is activated to cut OFF the power supply to the stove burners after a preprogrammed period of time elapses. In the case that the motion sensor detects human movements around the stove, the device will turn ON the stove' s burners again until another period of inactivity is detected and the cycle will be repeated.
Description
BACKGROUND OF THE INVENTION
This present invention relates to a fire safety device which can be used with an electric cooking stove. In the case that an electrical stove is turned ON and left unattended for some period of time, this device will shut OFF the power supplied to the burners after a preprogrammed period of time in order to elimin~te the fire hazard.
Presently used electrical stoves have no means of elimin~ting fire hazards if left turned ON unattended for longer periods of time. In currently used electrical stoves only ovens have a user programmable timers which can shut OFF the oven after a certain period of time elapses. However, these devices are designed to prevent overcooking rather than elimin~ting possibility of fires. According to the Fire Marshal in Toronto, in 1992 there have been over 2400 registered fires caused by cooking on top burners of the cooking stove with 11 fatalities. The statistical figures have remained the same for the past few years.
-FIRE PREVENTION DEVICE FOR ELECTRIC COOKING STOVE
The presented invention is designed to prevent fire hazards caused by leaving anoperating electric stove unattended for longer periods of time. When an electric stove is 5 in use the said invention monitors surroundings of the stove for human activity. If there is no human motion detected for a preprogrammed period of time the bumers of the stove will be automatically tumed OFF. The invented device will turn the burners back ON
immediately upon detecting any motion in the stove area.
0 The presented invention consists of a motion sensor, a timing relay (off delay), relays and an optional transformer.
The motion sensor is an electronic device which monitors a certain area for human motion, and if such motion is detected it generates an electric impulse. This motion sensor is designed to detect human activity within an area of 120 degreeshorizontally and 20 degrees vertically for a distance of up to 5 meters. This operational range allows it to be used in a kitchen of any size. Also this motion sensor's design specifications allow it to be adjusted at any angle in relation to the floor surface. This permits the sensor to only detect motion at and above a specific height from the floor surface, thus not detecting the motion of pets and children not old enough to operate the stove safely.
The timing relay (off delay) is an electronic device which operates similarly to a regular relay, except that the built-in timing device delays switching OFF the relay for the preset period of time. Electric impulse sent to this timing relay (off delay), when the timing device counts down the time-delay period, causes the timing device to reset itself again to the preset period of time and countdown restarts. The time-delay period can be easily set to the desired value by individual stove users according to their needs, but not 21 q3533 to exceed the maximum value preset according to the safety considerations (maximum of about 30 minutes).
The timing relay (offdelay) in the presented invention is responsible for measuring time elapsed since motion sensor last registered human activity and for controlling relays s connected directly to the bumers of the stove. If no electric impulse is received from the motion sensor during a preset time-delay period, the timing relay (off delay) disconnects electric power from other relays causing them to turn off the stove's bumers.
The relays are responsible for making or breaking a connection in order to supply 0 or cut offelectrical power in the invented device's electric circuitry.
The optional transformer may by needed to supply the appropriate voltage to the motion sensor if it operates on other than 115 V voltage.
The invention, as exemplified by a preferred embodiment, is described with reference to the drawings in which:
Figure 1 is an electric schematic diagram which could be used to build the presented invention.
Figure 2 is a front view of the stove with the motion sensor and timing delay (off 20 relay) as shown in Figure 1 installed on the stove Figure 3 is a top view of the stove shown in Figure 2 Figure 4 is a top view of the stove shown in Figure 2 The presented invention operates in the following manner: when the stove's 2s bumer is activated by tuming the power knob to ON position, the power is supplied to connectors 4 and 8 of relay no.1 (Figure I ) which causes the coil to connect connectors 4 and 6 (figure I ) together which in turn transfers electric current to connector I 1 of the timing relay (off delay) no.4. At same time constantly powered connector 3 of relay no. 1 21 ~3533 -is connected with connector 5 of relay no.1 and then electric power is transferred to the optional transforrner no.6 and connector 10 ofthe timing relay (offdelay) no.4. Power supplied to connector 10 of the timing relay (offdelay) no.4 causes coil to disconnect connectors 8 and 11 of the timing relay (offdelay) no.4 which in turn disconnects electric current from relay no.3. If no power is supplied to relay no.3 the connectors 2 and 6 of this relay are connected and conduct electricity from the fuses to the burners allowing for normal stove operation.
When the power is initially supplied to the timing relay (off delay) no.4 timer o device gets set for a preprogrammed time period and countdown begins. Two possible events may occur:
1. If motion sensor no.5 does not detect any human motion (in its operating range) no impulse is sent to the connectors 5 and 7 of timing relay (off delay) no.4, and after the preprogrammed period of time elapses connectors ~ and 11 in the timing relay(offdelay) no.4 get connected, and power is supplied to connector 7 on the relayno.3. This disconnects connectors 2 and 6 which results in the cutting off supply of electric current to the burner. The stove's burners stop producing any heat.
20 2. In the case when motion sensor no.5 detects any human motion (in its operating range) the impulse from motion sensor no.5 is sent to connectors 5 and 7 of the timing relay (off delay) no.4 which causes the timing device to reset itself to the originally preprogrammed time period and countdown restarts. If the power at this time was not supplied to relay no.3 (because previous countdown has not elapsed yet) nothing changes in the system, otherwise power supplied to the relay no.3 is immediately cut off and the relay no.3 connects its own connectors 2 and 6 which in turn supplies power to the burners. The stove's burners begin to produce heat again.
-When the stove's bumer is deactivated by turning the power knob to the OFF
position, the supply of electric current is withdrawn from the entire device and stove's bumers stop to produce heat.
This present invention relates to a fire safety device which can be used with an electric cooking stove. In the case that an electrical stove is turned ON and left unattended for some period of time, this device will shut OFF the power supplied to the burners after a preprogrammed period of time in order to elimin~te the fire hazard.
Presently used electrical stoves have no means of elimin~ting fire hazards if left turned ON unattended for longer periods of time. In currently used electrical stoves only ovens have a user programmable timers which can shut OFF the oven after a certain period of time elapses. However, these devices are designed to prevent overcooking rather than elimin~ting possibility of fires. According to the Fire Marshal in Toronto, in 1992 there have been over 2400 registered fires caused by cooking on top burners of the cooking stove with 11 fatalities. The statistical figures have remained the same for the past few years.
-FIRE PREVENTION DEVICE FOR ELECTRIC COOKING STOVE
The presented invention is designed to prevent fire hazards caused by leaving anoperating electric stove unattended for longer periods of time. When an electric stove is 5 in use the said invention monitors surroundings of the stove for human activity. If there is no human motion detected for a preprogrammed period of time the bumers of the stove will be automatically tumed OFF. The invented device will turn the burners back ON
immediately upon detecting any motion in the stove area.
0 The presented invention consists of a motion sensor, a timing relay (off delay), relays and an optional transformer.
The motion sensor is an electronic device which monitors a certain area for human motion, and if such motion is detected it generates an electric impulse. This motion sensor is designed to detect human activity within an area of 120 degreeshorizontally and 20 degrees vertically for a distance of up to 5 meters. This operational range allows it to be used in a kitchen of any size. Also this motion sensor's design specifications allow it to be adjusted at any angle in relation to the floor surface. This permits the sensor to only detect motion at and above a specific height from the floor surface, thus not detecting the motion of pets and children not old enough to operate the stove safely.
The timing relay (off delay) is an electronic device which operates similarly to a regular relay, except that the built-in timing device delays switching OFF the relay for the preset period of time. Electric impulse sent to this timing relay (off delay), when the timing device counts down the time-delay period, causes the timing device to reset itself again to the preset period of time and countdown restarts. The time-delay period can be easily set to the desired value by individual stove users according to their needs, but not 21 q3533 to exceed the maximum value preset according to the safety considerations (maximum of about 30 minutes).
The timing relay (offdelay) in the presented invention is responsible for measuring time elapsed since motion sensor last registered human activity and for controlling relays s connected directly to the bumers of the stove. If no electric impulse is received from the motion sensor during a preset time-delay period, the timing relay (off delay) disconnects electric power from other relays causing them to turn off the stove's bumers.
The relays are responsible for making or breaking a connection in order to supply 0 or cut offelectrical power in the invented device's electric circuitry.
The optional transformer may by needed to supply the appropriate voltage to the motion sensor if it operates on other than 115 V voltage.
The invention, as exemplified by a preferred embodiment, is described with reference to the drawings in which:
Figure 1 is an electric schematic diagram which could be used to build the presented invention.
Figure 2 is a front view of the stove with the motion sensor and timing delay (off 20 relay) as shown in Figure 1 installed on the stove Figure 3 is a top view of the stove shown in Figure 2 Figure 4 is a top view of the stove shown in Figure 2 The presented invention operates in the following manner: when the stove's 2s bumer is activated by tuming the power knob to ON position, the power is supplied to connectors 4 and 8 of relay no.1 (Figure I ) which causes the coil to connect connectors 4 and 6 (figure I ) together which in turn transfers electric current to connector I 1 of the timing relay (off delay) no.4. At same time constantly powered connector 3 of relay no. 1 21 ~3533 -is connected with connector 5 of relay no.1 and then electric power is transferred to the optional transforrner no.6 and connector 10 ofthe timing relay (offdelay) no.4. Power supplied to connector 10 of the timing relay (offdelay) no.4 causes coil to disconnect connectors 8 and 11 of the timing relay (offdelay) no.4 which in turn disconnects electric current from relay no.3. If no power is supplied to relay no.3 the connectors 2 and 6 of this relay are connected and conduct electricity from the fuses to the burners allowing for normal stove operation.
When the power is initially supplied to the timing relay (off delay) no.4 timer o device gets set for a preprogrammed time period and countdown begins. Two possible events may occur:
1. If motion sensor no.5 does not detect any human motion (in its operating range) no impulse is sent to the connectors 5 and 7 of timing relay (off delay) no.4, and after the preprogrammed period of time elapses connectors ~ and 11 in the timing relay(offdelay) no.4 get connected, and power is supplied to connector 7 on the relayno.3. This disconnects connectors 2 and 6 which results in the cutting off supply of electric current to the burner. The stove's burners stop producing any heat.
20 2. In the case when motion sensor no.5 detects any human motion (in its operating range) the impulse from motion sensor no.5 is sent to connectors 5 and 7 of the timing relay (off delay) no.4 which causes the timing device to reset itself to the originally preprogrammed time period and countdown restarts. If the power at this time was not supplied to relay no.3 (because previous countdown has not elapsed yet) nothing changes in the system, otherwise power supplied to the relay no.3 is immediately cut off and the relay no.3 connects its own connectors 2 and 6 which in turn supplies power to the burners. The stove's burners begin to produce heat again.
-When the stove's bumer is deactivated by turning the power knob to the OFF
position, the supply of electric current is withdrawn from the entire device and stove's bumers stop to produce heat.
Claims (6)
1. A fire hazard prevention device for an electric stove/oven comprised of a motion detector, a timing relay (off delay), and relays which allow for the stove to beautomatically turned OFF should the stove be left unattended for longer than pre-programmed period of time.
2. A method for installing the device described in claim 1 and built according to the specifications claimed in claim 2 inside of the stove/oven as an integral part of an electric stove/oven.
3. A method for installing the device described in claim no. 1 and built according to the specifications claimed in claim 2 as a separate, stand alone unit connected with the stove/oven's electric circuitry.
4. A method of utilising the device described in claim 1 and built according to the specifications claimed in the claim 2 as follows:
a) to protect from fire hazards every single burner of the electric stove with separate circuitry, relays, and a separate timing relay (off relay) for each burner protected, in which case time-delay period can be specified individually for every burner, b) to protect from fire hazards any pair of stove burners simultaneously with separate circuitry, relays and a separate timing relay (off relay) for each pair of burners protected, in which case the time-delay period can be specified individually for every pair of burners, c) to protect from fire hazards all burners of the stove simultaneously with a single timing relay (off delay) and a set of relays for all burners protected, in which case time-delay period can only be set to the same value for every burner, d) to protect from fire hazards the oven of the electric stove by the use of a different timing relay which would not allow the oven to be turned back ON once the pre-programmed period time on the timing relay has elapsed, causing the oven to be turned OFF; in order to turn the oven back ON the user must turn it ON manually.
a) to protect from fire hazards every single burner of the electric stove with separate circuitry, relays, and a separate timing relay (off relay) for each burner protected, in which case time-delay period can be specified individually for every burner, b) to protect from fire hazards any pair of stove burners simultaneously with separate circuitry, relays and a separate timing relay (off relay) for each pair of burners protected, in which case the time-delay period can be specified individually for every pair of burners, c) to protect from fire hazards all burners of the stove simultaneously with a single timing relay (off delay) and a set of relays for all burners protected, in which case time-delay period can only be set to the same value for every burner, d) to protect from fire hazards the oven of the electric stove by the use of a different timing relay which would not allow the oven to be turned back ON once the pre-programmed period time on the timing relay has elapsed, causing the oven to be turned OFF; in order to turn the oven back ON the user must turn it ON manually.
5. A method of protecting the electric stove/oven from fire hazards by using thedevice described in claim 1, where instead of using a motion sensor, another device which could utilise: heat, laser beam, light or other electromagnetic waves could be used to detect human motion in the surroundings of the stove.
6 A method of building the described device by connecting all the listed components as shown on the attached schematic diagram (Figure 1)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2193533 CA2193533A1 (en) | 1996-12-20 | 1996-12-20 | Fire prevention device for electric cooking stove |
| CA002225259A CA2225259A1 (en) | 1996-12-20 | 1997-12-19 | Fire prevention device for electric cooking stove |
| PCT/CA1997/000982 WO1998028944A1 (en) | 1996-12-20 | 1997-12-19 | Fire prevention device for electric cooking stove |
| AU54722/98A AU5472298A (en) | 1996-12-20 | 1997-12-19 | Fire prevention device for electric cooking stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2193533 CA2193533A1 (en) | 1996-12-20 | 1996-12-20 | Fire prevention device for electric cooking stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2193533A1 true CA2193533A1 (en) | 1998-06-20 |
Family
ID=4159492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2193533 Abandoned CA2193533A1 (en) | 1996-12-20 | 1996-12-20 | Fire prevention device for electric cooking stove |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU5472298A (en) |
| CA (1) | CA2193533A1 (en) |
| WO (1) | WO1998028944A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8890034B2 (en) | 2009-04-20 | 2014-11-18 | Birendra Kumar Mishra | Fire prevention device using sensor input parameters |
| US9928672B2 (en) | 2013-12-05 | 2018-03-27 | Wallflower Labs Inc. | System and method of monitoring and controlling appliances and powered devices using radio-enabled proximity sensing |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE527030C2 (en) * | 2004-04-29 | 2005-12-06 | Athena Nordic Ab | Device for controlled current supply to an electrically driven unit |
| SI22307A (en) * | 2006-05-30 | 2007-12-31 | Bc2222 D.O.O. | Device for protection of free-standing thermal household appliances |
| DE102007029695A1 (en) * | 2007-06-27 | 2009-01-08 | BSH Bosch und Siemens Hausgeräte GmbH | Method for preventing inadvertent operation of a heater |
| ES2328550B1 (en) | 2007-10-18 | 2010-08-30 | Bsh Electrodomesticos España, S.A. | COOKING FIELD. |
| SE536689C2 (en) * | 2012-07-13 | 2014-05-27 | Sensagon Ab | Device that prevents stove fire and allows normal cooking to continue |
| EP3063474A1 (en) * | 2013-11-01 | 2016-09-07 | Arçelik Anonim Sirketi | Heating cooktop system having advanced cooking process safety control function |
| JP6494381B2 (en) * | 2015-04-06 | 2019-04-03 | 三菱電機株式会社 | Cooker |
| US9959728B2 (en) | 2015-06-04 | 2018-05-01 | International Business Machines Corporation | Managing a smart appliance with a mobile device |
| US11328582B1 (en) | 2021-07-07 | 2022-05-10 | T-Mobile Usa, Inc. | Enhanced hazard detection device configured with security and communications capabilities |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4775913A (en) * | 1987-09-02 | 1988-10-04 | Ekblad Carl A | Safety shutoff device for a stove |
| JPH02279925A (en) * | 1989-04-18 | 1990-11-15 | Matsushita Electric Ind Co Ltd | Temperature excessive rise preventing device for electric heating cooking apparatus |
| US5380985A (en) * | 1994-01-06 | 1995-01-10 | Graham; Larry J. | Presence delector for controlling an electric range |
| US5717188A (en) * | 1995-06-12 | 1998-02-10 | Vaillancourt; Alain | Safety device for a heating appliance |
-
1996
- 1996-12-20 CA CA 2193533 patent/CA2193533A1/en not_active Abandoned
-
1997
- 1997-12-19 AU AU54722/98A patent/AU5472298A/en not_active Abandoned
- 1997-12-19 WO PCT/CA1997/000982 patent/WO1998028944A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8890034B2 (en) | 2009-04-20 | 2014-11-18 | Birendra Kumar Mishra | Fire prevention device using sensor input parameters |
| US9928672B2 (en) | 2013-12-05 | 2018-03-27 | Wallflower Labs Inc. | System and method of monitoring and controlling appliances and powered devices using radio-enabled proximity sensing |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1998028944A1 (en) | 1998-07-02 |
| AU5472298A (en) | 1998-07-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |