JPH0330723Y2 - - Google Patents

Description

[Detailed explanation of the invention] Purpose of the invention (industrial application field) This invention relates to microwave ovens, and in particular, a latch is provided on the door that covers the heating cooking chamber so that it can be opened and closed, and the latch is placed on the frame when the door is closed. The present invention relates to a microwave oven in which a door is held in a closed state by engaging with a hook provided therein.

(Problem to be solved by the invention) This invention makes it possible to easily assemble a pair of switches for magnetron operation on the front and back sides of a single synthetic resin board without using screws, etc. At the same time, you can also set those switches to 1.
To provide a microwave oven that can be opened and closed almost simultaneously based on the rotation of two operating levers, which can reliably operate and stop the magnetron, has an extremely simple configuration, and can easily mold a substrate. This is what I am trying to do.

Structure of the invention (means for solving the problem) This invention was made by paying attention to the above-mentioned problem, and includes latches 15A and 15B on the door 7 that covers the heating cooking chamber 2 so as to be openable and closable. , and when the door 7 is closed, the latches 15A and 15B are connected to the frame 1.
In a microwave oven configured to hold the door 7 in a closed state by engaging with hooks 13a and 13b provided above, the microwave oven is fixed to the frame 1 in the vicinity of the hooks 13a and 13b. A substrate 13 made of synthetic resin, a pair of switches 19 and 22 arranged substantially opposite to each other on both sides of the substrate 13 and closed to operate the magnetron 12, and a pair of switches 19 and 22 that are rotated on the frame 1 or the substrate 13. An operating lever 23 is movably supported and rotated in one direction by engaging with the latch 15A, and the operating lever 23 has a pair of switch operating portions 23c and 23d corresponding to both the switches 19 and 22, respectively. and both switches 19 and 22 are closed by the switch actuating parts 23c and 23d when the actuating lever 23 is rotated due to engagement with the latch 15B,
Switches 19 and 22 are provided on both the front and back sides of the board 13.
Fixing pieces 35, 36 are integrally formed, which abut on the periphery of the switch 19, 22, and hook onto parts of the switches 19, 22 with hook portions 35a, 36a protruding from their tips to securely hold the switches 19, 22. Said key part 35
A through hole 3 is formed in the substrate 13 so as to face the holes 36a and 36a.
7, 38, and further includes front and back fixing pieces 35,
36 are slightly shifted from each other so as not to be located in the same part, and the opposing positions of the front and back switches 19 and 22 are slightly displaced, and the operating lever 2
The switch operating parts 23c, 23d of the switches 19, 23 open and close the switches 19, 22 almost simultaneously.
They are disposed in a manner that corresponds to the displacement amount of 22.

(Function) Therefore, in the microwave oven of this invention, fixing pieces 35 and 36 having hooks 35a and 36a for fixing and holding the pair of switches 19 and 22 are formed protruding from both the front and back surfaces of the base plate 13. , a mold for molding the fixing pieces 35 and 36 is provided through the hole 37,
It can be easily extracted from 38, and
Using these fixing pieces 35 and 36, the pair of switches 19 and 22 can be easily assembled and arranged on the front and back sides of the board 13 at substantially opposing positions. Also, operating lever 2
3, a pair of switch actuating parts 23c, 2
3d allows both switches 19 and 22 to be closed almost simultaneously.

(Example) An example of this invention will be described below with reference to the drawings.

Now, in the microwave oven of this embodiment, as is clear from FIGS. 2 and 3, a heating cooking chamber 2 with an open front is formed inside the frame 1, and the frame 1 is provided outside the frame 1. A cover 4 is attached to cover it from the outside. A bottom plate 5 is attached to the lower part of the frame 1, and a plurality of support legs 6 are protruded from the bottom surface of the bottom plate 5. A door 7 is rotatably attached to the front surface of the frame 1 at its left edge, and covers the front surface of the heating cooking chamber 2 so as to be openable and closable.

As shown in FIG. 3, a synthetic resin coupling 8 is rotatably supported at the inner bottom of the heating cooking chamber 2, and is rotationally driven by a motor 9 mounted on the lower surface of the frame 1 via a reduction gear mechanism 10. It is becoming more and more common. A glass turntable 11 for placing an object to be heated is removably supported on the coupling ring 8 and rotated integrally with the coupling ring 8. A magnetron 12 is disposed on the right outer surface of the frame 1, and supplies high frequency energy into the cooking chamber 2 to heat and cook the object on the turntable 11.

As is clear from FIGS. 2 and 4, on the inner surface of the front wall of the frame 1, facing the open end of the door 7, a synthetic resin hanging body 13 is attached which also serves as a switch mounting board. A pair of upper and lower hooking portions 13a and 13b are formed on the front wall thereof. A support body 14 having a substantially U-shaped cross section is attached to the open side end of the door 7, and a support body 14 having a substantially U-shaped cross section is attached between both side plates of the support body 14, which engages the latching portions 13a and 13b of the latching body 13 when the door 7 is closed. A pair of upper and lower latches 15A and 15B for locking and holding the door 7 in the closed state are rotatably supported by a shaft 16. A connecting rod 17 is installed between both latches 15A, 15B, and both latches 15A, 15B
can be arranged in conjunction with the locking position shown in FIG. 4 and the release position shown in FIG. A tension spring 18 is hung between the lower end of the connecting rod 17 and the lower end of the support body 14, and urges the latches 15A, 15B to rotate toward the latching position.

As shown in FIGS. 1, 4, 5, and 9, a normally open first latch switch 1 is provided on one side of the hook 13.
9. A normally open type monitor switch 20 and a normally open type second latch switch 21 are disposed in order from below, and the latch body 13 is positioned so as to be substantially opposed to the first latch 19 on both sides. A normally open door switch 22 is disposed on the other side, and each of these switches is a micro switch. the first latch switch 19;
Monitor switch 20 and second latch switch 21
On one side of the hook 13 in the vicinity of
6, each is rotatably supported between two positions. The second and third actuating levers 24, 25 have lower and upper latches 15B, 1 in one arm.
5A, and the other arm removably corresponds to the operation buttons 20a, 21a of the monitor switch 20 and the second latch switch 21, and corresponds to the locking position of the latches 15B, 15A. The monitor and second latch switches 20 and 21 are opened and closed as the switch rotates between the release position and the release position.

One arm of the first actuating lever 23 is formed with an engaging part 23a that removably corresponds to the tip of the lower latch 15B, and a driving part 23b for rotating the first actuating lever 23. The first latch switch 19 and the door switch 2 are mounted on the arm of the
A pair of switch operating portions 23c and 23d are branched and correspond to the two operating buttons 19a and 22a in a detachable manner. When the door 7 is closed as shown in FIGS. 4 and 5, the latches 15A and 15B are rotated to the latching position where they engage with the latching parts 13a and 13b of the latching body 13, and Accordingly, the first operating lever 23 is rotated toward the first latch switch 19 via the engaging portion 23a, and the switch operating portion 23 is rotated toward the first latch switch 19.
c and 23d, the first latch switch 19 and door switch 22 are closed.

As shown in Figures 2 and 7, a synthetic resin operation panel 2 is mounted on the front of the frame 1 on the right side of the door 7.
7 is attached, and a support hole 27a is formed in the lower front part of the lower end. A door opening operation button 28 made of synthetic resin is inserted and supported in the support hole 27a so as to be movable back and forth on a shaft portion 28a on the rear surface, and is biased forward by the action of a compression spring 29. Operation button 2
8, an operating lever 30 made of synthetic resin is rotatably supported on the frame 1 by a support shaft 31, and an engaging portion 30a that engages with the shaft portion 28a of the operating button 28 is formed at one end thereof. At the same time, a protruding piece 30b that engages with the driving portion 23b of the first actuating lever 23 is formed at the other end. When the first latch switch 19 and the door switch 22 are in the closed state, the door opening operation button 28 is pressed.
When is pressed, the operating lever 30 moves to the seventh position.
The first actuating lever 23 is rotated counterclockwise in the figure, and the first actuating lever 23 is rotated clockwise in the figure via the protruding piece 30b and the drive part 23b, so that the first
When the latch switch 19 and door switch 22 are opened, the latches 15A and 15B are rotated from the latched position to the released position.

Next, the installation structure of the switches 19 to 22, which is the main part of this invention, will be explained in detail.As shown in FIGS.
A pair of positioning pins 32 are integrally formed on the surface of the hook 13 corresponding to the switches 9, 20, and 21, and a pair of positioning pins 32 are formed on the back surface of the hook 13 corresponding to the switch 22 on the back side. Positioning pins 33 are integrally formed to protrude and are inserted into positioning holes 34 provided in each of the switches 19 to 22 to position the switches 19 to 22 on the front or back surface of the hook 13. ing.

Further, a pair of fixing pieces 35 are provided on the surface of the hook 13 corresponding to the switches 19, 20, 21 on the front side.
are integrally formed to protrude, and a pair of fixing pieces 36 are integrally formed to protrude from the back surface of the hook 13 corresponding to the switches 22 on the back side.
~ 22 in a pinched state from both sides. Hook portions 35a and 36a are provided at the ends of each pair of fixing pieces 35 and 36 to protrude inward, respectively, and are hooked onto a portion of the outer surface (corner portion in the embodiment) of each switch 19 to 22 from both sides. The switches 19 to 22 are held fixed by the switch. Through-holes 37 and 38 are respectively formed in the hooking body 13 so as to face the respective hooks 35a and 36a, and when molding the hooks 35a and 36a, the front and back sides of the hooking body 13 are formed through these through-holes 37 and 38. The mold can be cut to the opposite side.

In this embodiment, as is clear from FIGS. 1 and 6, the first latch switch 1
9 and the fixing pieces 35, 36 for the door switch 22 and the lock parts 35a, 36b of the fixing pieces 35, 36
The hanging body 13 is arranged so that the through holes 37 and 38 facing the hanging body 13
The front and back switches 19 and 22 are arranged with their opposing positions slightly shifted back and forth. Also, a pair of switch actuating parts 23c on the first actuating lever 23,
23d is formed so as to be displaced back and forth in accordance with the amount of displacement of the switches 19, 22, and as the first actuating lever 23 rotates, both switches 19,
22 are opened and closed almost simultaneously.

Next, the circuit configuration of the microwave oven configured as described above will be explained with reference to FIG. 19 and the second latch switch 21 are connected in series together with the fuse 43 and the heater disconnector 44, and the first latch switch 1
9. The monitor switch 20 is connected in parallel to the fuse 43 and the heater disconnector 44. Further, the turntable motor 9, heating cooking chamber lamp 45, and fan motor 46 are connected in parallel to the primary winding of the transformer 41 in the power supply circuit. Further, the turntable motor 9, heating cooking chamber lamp 45, and fan motor 46 are connected in parallel to the primary winding of the transformer 41 in the power supply circuit.

On the other hand, a microcomputer for controlling the operation of the magnetron 12 is mounted on a printed circuit board 47 provided inside the operation panel 27 shown in FIG. 2, and the door switch 22 is connected to its input circuit. A group of touch switches 4 provided on the upper front surface of the operation panel 27
8, by operating the switch for setting the heating cooking method, cooking time, etc. and the cooking start switch, the relay switches 49, 5 connected to the power supply circuit are controlled by the microcomputer.
0 is opened and closed arbitrarily to operate the magnetron 12 and the like.

Next, the operation of the microwave oven configured as described above will be explained.

When cooking an object in this microwave oven, open the door 7 on the front of the frame 1, place the object on the turntable 11 in the cooking chamber 2, and then close the door 7. When closed, the fourth
Latches 15A and 15B in the latching position as shown in the figure.
are engaged with the latching portions 13a and 13b of the latching body 13, and the door 7 is latched and held in the closed state. By engaging with the latches 15A and 15B, the first to third
The operating levers 23, 24, 25 are rotated, and the first
The latch switch 19, the second latch switch 21 and the door switch 22 are closed almost simultaneously, and the monitor switch 20 is opened.

In this state, after arbitrarily selecting and operating the touch switch group 48 on the front of the operation panel 27 to set the cooking method suitable for the object to be heated, and operating the cooking start switch, the power supply circuit relay shown in FIG. The switches 49 and 50 are closed and the magnetron 12
etc. are operated, high frequency energy is supplied into the heating cooking chamber 2, and the object to be heated is heated and cooked.

Next, press the door opening operation button 2 on the front of the operation panel 27.
When 8 is pressed, the operating lever 3 for opening the door
0, the first operating lever 23 is rotated clockwise from the state shown in FIG. 7, the first latch switch 19 and the door switch 22 are opened almost simultaneously, and the operation of the magnetron 12 and the microcomputer is stopped. In this way, the magnetron 12 can be reliably activated and stopped by one operating lever 23, and both the front and rear switches 1
Two levers corresponding to 9 and 22 are not required, and the configuration can be simplified. When the first actuating lever 23 is further rotated, the lower latch 15B is rotated to the release position via the engaging portion 23a and disengaged from the latching portion 13b, as shown in FIG. Upper latch 15A via rod 17
is rotated to the release position and detached from the latch portion 13a, and the door 7 is released from the latch state.

Further, when the upper latch 15A is rotated to the release position as described above, the tip of the latch 15A is separated from the third operating lever 25, as shown in FIG. 9, and the second latch switch 21 is opened. . After that, the door 7 is opened and the latch 15A is in the released position.
When the lever 15B is moved forward from the vicinity of the hooks 13a and 13b, the second operating lever 24 is rotated from the solid line position to the chain line position in FIG. 9, and the monitor switch 20 is closed. Therefore, when the door 7 starts to open, if the first latch switch 19 is not opened due to a malfunction or the like, the fuse 43 of the power supply circuit shown in FIG. 8 is blown as the monitor switch 20 is closed. Then, magnetron 12
The power supply to the device will be immediately cut off and it can be used safely.

Also, when molding the hanging body 13, the fixing piece 35,
36 and the through holes 37 and 38 facing the hooks 35a and 36a of the fixing piece 35 are misaligned on the front and back.
The molds for molding 5a and 36a are made through holes 37 and 38.
It can be easily pulled out through it, making molding easier. Each switch 19, 20, 21 is securely fixed by each fixing piece 35, 36 and its hook portion 35a, 36a, and there is no need for screws or the like for fixing the switch, making assembly easy.

It should be noted that this invention is not limited to the configuration of the above-mentioned embodiments, and it is also possible to embody the invention by changing the configuration of each part arbitrarily within a range that does not depart from the spirit of this invention.

Effects of the invention As detailed above, this invention allows a pair of switches for magnetron operation to be easily assembled on the front and back sides of a single synthetic resin board, without using screws, etc. As well as being able to
These switches can be opened and closed almost simultaneously based on the rotation of a single actuating lever, making it possible to operate and stop the magnetron reliably.The configuration is also extremely simple, and the board can be easily molded. It has this excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a partial side view showing a configuration in which a pair of switches are attached to both the front and back surfaces of a locking member in a microwave oven embodying this invention; Fig. 2 is a perspective view showing the entire microwave oven; FIG. 3 is a longitudinal cross-sectional view of the main parts of the microwave oven; FIG. 4 is a partial side cross-sectional view showing the door locking structure and the operating structure of the related switches; FIG. 5 is a perspective view showing the entire microwave oven; is a partial side view of a portion of FIG. 4 seen from the back side, FIG. 6 is a partial sectional view taken along line A-A in FIG. 1, and FIG. 7 is a partial side view of a portion of the door opening operation button and operation lever 8 is a control circuit diagram of this microwave oven, and FIG. 9 is a partial side sectional view showing the operating state of FIG. 4. 1...Frame, 2...Heating cooking chamber, 7...
Door, 12... magnetron, 13... hanging body forming a board for mounting the switch, 13a, 13b...
...Latching part, 15A, 15B... Latch, 19...
1st latch switch, 22...Door switch, 2
3...First operating lever, 23c, 23d...Switch operating portion, 35, 36...Fixing piece, 35a, 3
6a...key part, 37, 38...through hole.

Claims (1)

[Scope of claim for utility model registration] A latch 1 on the door 7 that covers the heating cooking chamber 2 so that it can be opened and closed.
5A and 15B, and when the door 7 is closed, the latches 15A and 15B engage with the latches 13a and 13b provided on the frame 1 to hold the door 7 in the closed state. In the microwave, a substrate 13 made of synthetic resin is fixed to the frame 1 near the hooks 13a and 13b.
and a pair of switches 19 and 22 which are arranged substantially opposite to each other on both the front and back surfaces of the substrate 13 and are closed for the operation of the magnetron 12, rotatably supported on the frame 1 or the substrate 13, an operating lever 23 that engages with the latch 15A and rotates in one direction;
2 and a pair of switch operating parts 23 corresponding to each other.
c, 23d, and both switches 19, 22 are closed by the switch actuating parts 23c, 23d when the actuating lever 23 is rotated due to engagement with the latch 15B; There are switches 19 and 2 on both the front and back sides of the
Fixing pieces 35, 36 are integrally formed to abut on the circumferential surface of the switches 19, 2, and to hook onto parts of the switches 19, 22 with hooks 35a, 36a protruding from their tips to securely hold the switches 19, 22. and said key part 3
Through holes 37 and 38 are formed in the substrate 13 so as to face the holes 5a and 36a, and fixing pieces 3 on the front and back sides are formed.
5 and 36 are slightly shifted from each other so as not to be located in the same part, and the opposing positions of the front and back switches 19 and 22 are slightly displaced, and both switch actuating parts 23c and 23d of the operating lever 23 are aligned with the switches 19 and 22. The switch actuators 23c and 23d are set to switch 1 so that they open and close almost simultaneously.
A microwave oven characterized in that the microwave oven is disposed in a manner that corresponds to the amount of displacement of 9 and 22.