AU5827899A - Safety device for a microwave oven - Google Patents
Safety device for a microwave oven Download PDFInfo
- Publication number
- AU5827899A AU5827899A AU58278/99A AU5827899A AU5827899A AU 5827899 A AU5827899 A AU 5827899A AU 58278/99 A AU58278/99 A AU 58278/99A AU 5827899 A AU5827899 A AU 5827899A AU 5827899 A AU5827899 A AU 5827899A
- Authority
- AU
- Australia
- Prior art keywords
- microwave oven
- door
- circuit board
- key switch
- sensitive switches
- 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
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/6414—Aspects relating to the door of the microwave heating apparatus
- H05B6/6417—Door interlocks of the microwave heating apparatus and related circuits
-
- 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
- F24C15/00—Details
- F24C15/02—Doors specially adapted for stoves or ranges
-
- 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
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/6414—Aspects relating to the door of the microwave heating apparatus
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electric Ovens (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
- Constitution Of High-Frequency Heating (AREA)
Description
r/UU/UI I 28/5/81 Regulation 3.2(2)
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT Application Number: Lodged: Invention Title: SAFETY DEVICE FOR A MICROWAVE OVEN The following statement is a full description of this invention, including the best method of performing it known to us SAFETY DEVICE FOR A MICROWAVE
OVEN
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven, and more particularly to a safety device for a microwave oven having an improved wiring structure for a sensitive switch (so called 'microswitch') which is employed to control the operation of the microwave oven by sensing the opening/closing status of the door of a microwave oven.
"iO 2. Description of the Prior Art *i FIG. 1 shows one example of a conventional microwave oven. According to FIG. 1, the conventional microwave oven includes a cooking chamber 12 and a device chamber 14, which are defined by a cabinet 11.
Usually, a tray 16 for placing a food receptacle thereon is mounted on the bottom of the cooking chamber 12. The tray 16 is driven by a driving motor (not shown), which is installed at a lower portion of the cooking chamber 12.
A magnetron 17 and electrical components for driving the magnetron 17 are formed in the device chamber 14. The high frequency microwave is generated from the magnetron 17, and is guided into the cooking chamber 12 via a waveguide (not shown).
A door 20 is mounted on the front side of the cooking chamber 12, while a control panel 30 is formed on the front side of the device chamber 14.
In the conventional microwave oven constructed as above, in accordance with the
I
operational modes that a user inputs through the control panel 30, the food is cooked by a high frequency microwave which is generated from the magnetron 17 and guided into the cooking chamber 12.
Here, in case the microwave oven operates while the door 20 is not completely closed, the user has the risk of being injured by the leakage of the high frequency microwave which is guided into the cooking chamber 12.
Therefore, a safety device has been essentially employed to control the operation of the microwave oven in accordance with the opening/closing status of the door 20 of which the safety device has detected.
As shown in FIGS. 2 and 3, such a safety device has a door latch 42 mounted on the cabinet 11, a plurality of sensitive switches 45, 46, and 47 mounted on the door latch 42, and a door key 48 mounted on the door 20 to control the turning on/off of the sensitive switches 46, and 47 in accordance with the opening/closing status of the door e The door key 48 includes a stick 49 movably disposed within the door 20, and a pair of key switch portions 50a and 50b extended from the stick 49 toward the door latch 42. The stick 49 is downwardly biased by a spring 51 which is disposed on a lower side of the stick 49.
The door latch 42 includes a pair of insertion holes 43a and 43b through which the key switch portions 50a and 50b are inserted, and a pair of locking portions 44a and 44b for preventing unintended separation of the key switch portions 50a and 50b while the key switch portions 50a and 50b are being inserted into the insertion holes 43a and 43b.
The plurality of sensitive switches 45, 46, and 47 include first and second sensitive switches 45 and 46 and a monitor switch 47 mounted at appropriate places of the door latch A switch lever 52 is disposed between the second sensitive switch 46 and the monitor switch 47. A door lever 53 is formed on the lower side of the door latch 42.
The plurality of sensitive switches 45, 46, and 47 are connected to a main circuit board 32 mounted on a rear side of the control panel 30 of the microwave oven by a connecting connector 54. The main circuit board 32 has a plurality of various electric components built-in for controlling the desired operation of the microwave oven.
When the door 20 is closed, the first and second key switch portions 50a and 50b are inserted into the insertion holes 43a and 43b of the door latch 42, and moved along the upper faces of the locking portions 44a and 44b which are upwardly extended from the rear side of eoo the insertion holes 43a and 43b.
0".
When the door 20 is completely closed, the first and second key switch portions and 50b are locked with the locking portions 44a and 44b.
Here, the first key switch portion 50a is locked with the first locking portion 44a, thereby pressing the contact point of the first sensitive switch 45, while the second key switch S°portion 50b is locked with the second locking portion 44b, thereby pressing the button of the monitor switch 47.
Simultaneously, the second key switch portion 50b downwardly pivots the switch lever 53 by pressing the switch lever 53. Accordingly, the switch lever 53 presses the button of the second sensitive switch 46 while being pivoted.
As described above, when the first and second key switch portions 50a and 50b are inserted into the insertion holes 43a and 43b of the door latch 42, and press the buttons sensitive switches 45, 46, and 47, the microwave oven is enabled to operate. Accordingly, the user cooks the food by manipulating the control panel Meanwhile, in the event that the door 20 is incompletely closed and any button of the first and second sensitive switches 45 and 46, and the monitor switch 47 is not pressed, the microwave oven does not operate.
As shown in FIG. 3, the conventional microwave oven employs separate connecting connectors 54 for connecting the sensitive switches 45, 46, and 47 to the main circuit board 32.
Accordingly, the wiring structure between the sensitive switches 45, 46, and 47 and the main circuit board 32 becomes complex, while a lot of processes have to be taken for wiring such as tying the lines of the connecting connectors 54 in a bundle to prevent any interference S. with another component, etc. Such has been the main cause of assembly efficiency deterioration and increased manufacturing cost, resulting in a deteriorated competitiveness of a.° a. a the products.
SUMMARY OF THE INVENTION The present invention has been made to overcome the above-described problems of the prior art, and accordingly, it is an object of the present invention to provide a safety device for a microwave oven having a simpler wiring structure between a plurality of sensitive switches and a main circuit board.
The above object is accomplished by a safety device for a microwave oven according to the present invention, including: a door key movably mounted on a door of the microwave oven and having a key switch portion protruded toward the front side of the cabinet of the microwave oven; a door latch fixed within the cabinet and having an insertion hole through which the key switch portion of the door key is inserted; a plurality of sensitive switches for turning on/off an electricity supply which is electrically connected thereto by being turned on/off in accordance with an insertion of the key switch portion; and a printed circuit board on which a plurality of sensitive switches are fixed, and in which wiring is formed to electrically connect the sensitive switches to a main circuit board. Here, the printed circuit board and the main circuit board are electrically connected by a parallel connector.
According to the present invention, since a plurality of sensitive switches are disposed on the printed circuit boards, the wiring structure between the sensitive switches and the main circuit board becomes greatly simplified.
Further, the object of the present invention is accomplished by a safety device for a microwave oven according to the present invention, including a door key movably mounted on a door of the microwave oven and having a key switch portion protruded toward the front side of the cabinet of the microwave oven; a plurality of sensitive switches for turning on/off an electricity supply which is electrically connected thereto by being turned on/off in accordance with an insertion of the key switch portion; and a printed circuit board on which a plurality of sensitive switches are fixed, and in which wiring is formed to electrically connect the sensitive switches.
BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects and the advantages of the present invention will become readily apparent by reference to the following detailed description when considered in conjunction with the accompanied drawings in which: FIG. 1 is a perspective view of a general microwave oven; FIG. 2 is an exploded perspective view of a safety device of a conventional microwave oven; FIG. 3 is a perspective view for showing the wiring structure of the safety device for the conventional microwave oven of FIG. 2; FIG. 4 is an exploded perspective view of the safety device for a microwave oven according to an embodiment of the present invention; and FIG. 5 is a perspective view for showing the wiring structure of the safety device of the microwave oven of FIG. 4.
e• DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENT
a.e Hereinafter, the preferred embodiment of the present invention will be described in .15 greater detail with reference to the accompanied drawings.
The safety device for the microwave oven according to the preferred embodiment of the present invention is shown in FIGS. 4 and 5, wherein FIG. 4 is an exploded perspective view of the safety device for a microwave oven according to the preferred embodiment of the present invention, and FIG. 5 is a perspective view for showing the wiring structure for the safety device of microwave oven of FIG. 4.
As shown, the safety device for the microwave oven according to the preferred embodiment of the present invention includes a door latch 110 disposed within the cabinet 102, a printed circuit board 130 fixed to the door latch 110, and a plurality of sensitive switches 131, 132, and 133 mounted on the printed circuit board 130 to be turned on/off by the door key 120.
The door key 120 includes a stick 121 vertically disposed within the door 101, and a pair of key switch portions 122a and 122b extended from the stick 121 toward the door latch 110. The stick 121 is downwardly biased by a spring 123, which is disposed on the lower side of the stick 121.
The door latch 110 includes a pair of insertion holes 112a and 112b through which the key switch portions 122a and 122b of the door key 120 are inserted, and a pair of locking portions 114a and 114b for preventing unintended separation of the key switch portions 122a and 122b from the insertion holes 112a and 112b.
~The printed circuit board 130 is fixed to the rear side of the locking portions 114a and 114b of the door latch 110, while the plurality of sensitive switches, the first and second sensitive switches 131 and 132 and the monitor switch 133 are mounted at the appropriate places on the printed circuit board 130.
The first sensitive switch 131 is disposed on the rear side of the first locking portion 114a of the door latch 110, the monitor switch 133 is disposed on the rear side of the second locking portion 114b of the door latch 110, and the second sensitive switch 132 is disposed under the monitor switch 133.
An operational portion 117 is disposed between the monitor switch 133 and the second sensitive switch 132, to upwardly move the second key switch portion 122b by making the contact with the key switch portion 122b. The operational portion 117 is pressed downward by the key switch portion 122b, to press the button of the second sensitive switch 132. The operational portion 117 is integrally formed with the door lever 116.
The first and second sensitive switches 131 and 132, and the monitor switch 133 are connected with the wiring formed on the printed circuit board 130, while connection terminals thereof are electrically connected to the connection members 134 of the printed circuit board 130.
Meanwhile, a main circuit board 104 is mounted on the rear side of the control panel 103 of the microwave oven, having various electric components of control part mounted thereon for controlling the operation of the microwave oven. The main circuit board 104 and 10 the printed circuit board 130 are electrically connected to each other by parallel connectors 136a and 136b.
As shown in FIGS. 4 and 5, each of parallel connectors 136a and 136b includes an input connector 136a comprised of a bundle of input side wires and an output connector 136b comprised of a bundle of output side wires.
It is not necessarily to separate the input and output connectors 136a and 136b from each other, since the wiring layout of the main circuit board 104 and the printed circuit board 130 can be modified in various ways.
When the door 101 is closed, the first and second key switch portions 122a and 122b are inserted into the insertion holes 112a and 112b of the door latch 110 through the holes on the cabinet 102, and then moved along the upper faces of the locking portions 114a and 114b, which are upwardly extended from the rear side of the insertion holes 112a and 112b.
When the door is completely closed, the first and second key switch portions 122a and 8 122b are locked with the locking portions 114a and 114b.
The first key switch portion 122a is locked with the first locking portion 112a, to press the button of the first sensitive switch 131, and the second key switch portion 122b is locked with the second locking portion 112b, to press the button of the monitor switch 133.
Simultaneously, the operational portion 117 of the door lever 116 is pivoted downwardly by the second key switch portion 122b, to press the button of the second sensitive switch 132.
As described above, as the first and second key switch portions 122a and 122b are inserted through the insertion holes 112a and 112b of the door latch 110 to press the buttons of the sensitive switches 131, 132, and 133, the microwave oven is enabled to operate.
.*9 '.Accordingly, the user can cook the food in the microwave oven in accordance with the cooking modes he inputs by selecting the desired controls on the control panel 103.
In the event that the door 101 is incompletely closed, so that any button of the first and 9*° second sensitive switches 131 and 132 and the monitor switch 133, is not pressed, the 15 microwave oven can not operate.
**99e* When the user presses the door lever 116, the operational portion 117 of the door lever 116 is pivoted upwardly, and accordingly, the button of the second sensitive switch 132 is released.
The operational portion 117 of the door lever 116 presses the second key switch portion 122b upwardly when the operational portion 117 is pivoted upwardly, so that the second key switch portion 122b is released from the locking portion 114b.
In such a situation, the first key switch portion 122, which is connected via the stick 121, is released from the corresponding locking portion 114a.
When the first and second key switch portions 122a and 122b are released from the locking portions 1 14a and 114b, the key switch portions 122a and 122b are moved downwardly along the slanted faces of the locking portions 114a and 114b by the recovering force of the spring 123 connected to the stick 121, resulting in opening the door.
As described above, as the key switch portions 122a and 122b are released from the locking portions 114a and 114b, the buttons of the first and second sensitive switches 131 and 132 and the monitor switch 133 are released, so that the microwave oven does not operate.
Meanwhile, in the preferred embodiment of the present invention, although the printed circuit board 130 is fixed on the door latch 110, the printed circuit board 130 may be directly fixed onto the cabinet 102 and the insertion holes 112a and 112b, and the locking portions 14a and 114b of the door latch 110 may be directly formed on the cabinet 102. In the latter case, since there is no need for the door latch 110, the number of parts may be reduced.
As described above, according to the safety device for the microwave oven according to the present invention, wiring between the plurality of sensitive switches and the main circuit S* board is electrically connected by the parallel connector.
Accordingly, the wiring structure between the sensitive switches and the main circuit board becomes very simple, and the wiring process can be completed by simply connecting the parallel connectors. As a result, the number of processes is reduced, increasing the assembly efficiency.
Meanwhile, in the case of directly fixing the printed circuit board on the cabinet without employing the door latch, further advantages can be obtained such as reduced number i j of parts, and manufacturing costs, or the like.
As stated above, a preferred embodiment of the present invention is shown and described. Although the preferred embodiment of the present invention has been described, it is understood that the present invention should not be limited to this preferred embodiment but various changes and modifications can be made by one skilled in the art within the spirit and scope of the present invention as hereinafter claimed.
*o
Claims (5)
1. A safety device for a microwave oven including: a door key movably mounted on a door of the microwave oven and having a key switch portion protruded toward the front side of the cabinet of the microwave oven; a door latch fixed within the cabinet and having an insertion hole through which the key switch portion of the door key is inserted; a plurality of sensitive switches for turning on/off an electricity supply which is electrically connected thereto by being turned on/off in accordance with an insertion of the key switch portion; and a printed circuit board on which a plurality of sensitive switches are fixed, and in which wiring is formed to electrically connect the sensitive switches to a main circuit board.
2. The safety device as claimed in claim 1, wherein the printed circuit board and the main circuit board are electrically connected by a parallel connector. oo •99o99
3. A safety device for a microwave oven including: a door key movably mounted on a door of the microwave oven and having a key switch portion protruded toward the front side of the cabinet of the microwave oven; a plurality of sensitive switches for turning on/off an electricity supply which is electrically connected thereto by being turned on/off in accordance with an insertion of the key switch portion; and a printed circuit board on which a plurality of sensitive switches are fixed, and in 12 'U which wiring is formed to electrically connect the sensitive switches. DATED this 4th day of November 1999. SAMSUNG ELECTRONICS CO., LTD. WATERMvARK PATENT TRADEMARK ATTORNEYS 290 BURWOD ROAD HAWTHORN, VIC. 3122.
4* 0* S. S. S S. S.
5 S
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR9919132 | 1999-05-27 | ||
| KR1019990019132A KR20000074891A (en) | 1999-05-27 | 1999-05-27 | Door interlock apparatus for a microwave oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU5827899A true AU5827899A (en) | 2000-11-30 |
Family
ID=19588001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU58278/99A Abandoned AU5827899A (en) | 1999-05-27 | 1999-11-04 | Safety device for a microwave oven |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1056313A3 (en) |
| JP (1) | JP2000337640A (en) |
| KR (1) | KR20000074891A (en) |
| AU (1) | AU5827899A (en) |
| CA (1) | CA2288945A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100465518C (en) * | 2003-02-21 | 2009-03-04 | 乐金电子(天津)电器有限公司 | Microwave oven door pin board arrangement |
| KR100534541B1 (en) * | 2003-02-28 | 2005-12-08 | 주식회사 대우일렉트로닉스 | Microwave oven with a locking system for protecting children |
| CN104373976B (en) * | 2013-08-12 | 2017-05-03 | 广东美的厨房电器制造有限公司 | Household appliance |
| US11598532B2 (en) | 2017-07-06 | 2023-03-07 | Breville Pty Limited | Retractable door for an oven |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2661069B2 (en) * | 1987-10-30 | 1997-10-08 | 松下電器産業株式会社 | High frequency heating equipment |
| KR0135724B1 (en) * | 1994-02-25 | 1998-04-23 | 김광호 | Heating device of microwave |
-
1999
- 1999-05-27 KR KR1019990019132A patent/KR20000074891A/en not_active Application Discontinuation
- 1999-10-29 EP EP99308610A patent/EP1056313A3/en not_active Withdrawn
- 1999-11-04 CA CA002288945A patent/CA2288945A1/en not_active Abandoned
- 1999-11-04 AU AU58278/99A patent/AU5827899A/en not_active Abandoned
- 1999-12-15 JP JP11356641A patent/JP2000337640A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000337640A (en) | 2000-12-08 |
| KR20000074891A (en) | 2000-12-15 |
| EP1056313A2 (en) | 2000-11-29 |
| EP1056313A3 (en) | 2002-02-06 |
| CA2288945A1 (en) | 2000-11-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK5 | Application lapsed section 142(2)(e) - patent request and compl. specification not accepted |