JPH0347123Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a microwave oven, and in particular, a door that covers a heating cooking chamber so as to be openable and closable is provided with a latch that is movable between a latching position and a releasing position. The present invention relates to a microwave oven in which, when the door is closed, a latch at the latching position engages with a latching portion provided on the frame to hold the door in the closed state.

(Problems to be Solved by the Invention) This invention aims to provide a microwave oven that can reliably close and open a cooking switch for operating a magnetron in conjunction with opening and closing the door.

(Means for Solving the Problems) This invention was made by focusing on the above-mentioned problems, and the door 7 that covers the heating cooking chamber 2 so as to be openable and closable has a locking position and a release position. Latches 15A, 15B are provided which are movable between the two, and when the door 7 is closed, the latches 15A, 15B in the latching position engage with the latching portions 13a, 13b provided on the frame 1, and the door 7 is closed. In the microwave oven, the microwave oven is rotatably supported on the frame 1 in the vicinity of the hook part 13b between two positions,
An operating lever 24 that engages with the latch 15B and is rotated to one position by the engagement; The cooking switch 21 to be closed is supported on an operating lever 24 so as to be movable between two positions, a switch open position and a switch closed position, so as to correspond to the cooking switch 21, and the operating lever 24 is connected to the latch 15B. an opening/closing member 26 that closes the cooking switch 21 by being moved to a switch closing position in a state in which the opening/closing member 26 is rotated in one position;
a holding member 27 disposed on the frame 1 near the opening/closing member 26 and engaging with the opening/closing member 26 in the switch closed position to hold the opening/closing member 26 in the same position; a first manual operating member 3 disposed on the frame 1 to correspond to the lever 24 and rotating the operating lever 24 from the one position to the other position based on manual operation;
0, and a second manual operation member 31 that is arranged on the frame 1 so as to correspond to the opening and closing member 26 and moves the opening and closing member 26 from the switch open position to the switch closed position based on manual operation. When the door 7 is closed, the operating lever 24 is rotated to one position by engagement with the latch 15B in the latching position, and when the second manual operation member 31 is operated in this state, the opening/closing is performed. Member 26
is moved to the switch closed position and held at the switch closed position by engagement with the holding member 27,
Furthermore, in this state, the first manual operation member 3
0, the actuating lever 24 is rotated to the other position, the opening/closing member 26 is disengaged from the holding member 27 and moved to the switch open position, and the latch 15A,
15B is configured to be moved from the locking position to the release position.

(Function) Therefore, in the microwave oven of this invention, only when the door 7 is closed, the cooking switch 21 is closed by operating the second manual operation member 31, and the heating cooking by the magnetron 12 is started. When the first manual operation member 30 for releasing the latches 15A and 15B is operated while the cooking switch 21 is in the closed state, the cooking switch 21 is opened prior to opening the door 7. is immediately opened and the operation of the magnetron 12 is stopped, making it extremely safe to use.

(Example) Hereinafter, an example of this invention will be described in detail 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 placed on the outside of the frame 1. A cover 4 that covers from the outside is attached. 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. frame 1
A door 7 is rotatably attached to the front surface of the cooking chamber 2 at its left side edge, and covers the front opening 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. 1 and 2, on the inner surface of the front wall of the frame 1, facing the open end of the door 7, there is a hanging body 13 made of synthetic resin that also serves as a board for mounting the switch. 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 interlocked and disposed between the locking position shown in FIG. 1 and the release position shown in FIG. The latches 15A, 15B are pivoted toward the latching position.

As shown in FIGS. 1 and 7, on one side of the latch 13 are a normally open latch switch 19, a normally closed monitor switch 20, and a normally open cooking switch 21.
are arranged, each consisting of a micro switch. In the vicinity of each switch 19 , 20 , 21 , first, second and third actuation levers 22 , 23 , 24 made of synthetic resin and having a substantially two-arm shape are mounted on one side of the latching member 13 . Each is supported rotatably between two positions by an upper pin 25. The first and second actuation levers 22, 23 have upper and lower latches 15A, 15B on one arm.
The other arm portion of the latch switch 19 and the monitor switch 20 have operating buttons 19a and 20a that can be engaged and detached from each other. During the rotation, the latch and monitor switches 19 and 20 are opened and closed.

An engaging piece 24a that removably corresponds to the tip of the lower latch 15B is formed on one arm of the third operating lever 24, and an operating piece 24b for rotating the third operating lever 24. The other arm is formed with a bifurcated portion 24c having a pair of retaining protrusions 24d at its tips. An opening/closing member 26 made of synthetic resin is inserted into and supported by the other arm of the third operating lever 24 so as to be movable between two positions: a lower switch open position and an upper switch closed position, and the locking protrusion 24d It is prevented from coming out by. On one side of the opening/closing member 26 is an operating button 2 for the cooking switch 21.
An engaging portion 26a and a locking portion 26b that removably correspond to the opening/closing member 26 are formed on the other side.
An actuating piece 26c for moving is formed in a protruding manner. When the door 7 is closed as shown in FIGS. 1 and 4, the latches 15A and 15B
The third actuating lever 24 is disposed at a latching position where it engages with the latching portions 13a and 13b of No. 3, and the third actuating lever 24
When the opening/closing member 26 is moved to the upper switch closing position via the operating piece 26c by the rotation of the operating lever 35, which will be described later, in this state,
As shown in FIG. 5, the engaging portion 2 of the opening/closing member 26
6a presses the operating button 21a of the cooking switch 21, thereby closing the cooking switch 21.

A holding piece 27 constituting a holding member is formed on the hook 13 corresponding to the locking portion 26b of the opening/closing member 26, and the opening/closing member 26 is moved to the upper switch closing position as described above. At this time, as shown in FIG. 5, the locking portion 26b engages with the holding piece 27, the opening/closing member 26 is locked in the switch closed position, and the cooking switch 21 is held in the closed state. ing. A spring piece 28 as a biasing member is integrally formed to protrude from the upper part of the opening/closing member 26, and when the opening/closing member 26 is moved to the upper switch closing position as shown in FIG. The distal end engages with the proximal end boss portion of the third operating lever 24 and is bent, so that a downward moving force is applied to the opening/closing member 26. In this state, the third operating lever 24 is rotated clockwise in FIG. 5 via the operating piece 24b by the rotation of the operating lever 34, which will be described later, to lock the latches 15A and 15B.
When the opening/closing member 26 is separated from the cooking switch 21, as shown in FIG. 7, when the opening/closing member 26 is rotated to the release position where it is released from the latching parts 13a, 13b of the latching body 13, and the cooking switch 21 is opened. At the same time, the locking portion 26b of the opening/closing member 26 is disengaged from the holding piece 27, and the opening/closing member 26 is moved downward to the switch open position by the action of the spring piece 28.

As shown in FIGS. 2, 4, and 5, an operation panel 29 made of synthetic resin is attached to the front of the frame 1 on the right side of the door 7, and a pair of left and right support holes 29a are installed in the front lower end of the panel 29. 29b is formed. In each support hole 29a, 29b, there is a door opening operation button 30 made of synthetic resin that constitutes a first manual operation member and a cooking start operation button 31 made of synthetic resin that constitutes a second manual operation member. Rear shaft portion 30a, 3
It is inserted and supported in 1a so as to be movable back and forth, and is urged to move forward by the action of compression springs 32 and 33. An operating lever 34 made of synthetic resin for opening the door and an operating lever 35 for starting cooking are rotatably supported by a single support shaft 36 on the frame 1 so as to correspond to each operating button 30, 31. Shafts 30a, 31a of operation buttons 30, 31 are provided at one end.
Engagement portions 34a, 35a are formed to engage with the third operating lever 24, and protruding pieces 34b, 35b are formed at the other end to engage the operating piece 24b of the third operating lever 24 and the operating piece 26c of the opening/closing member 26. There is.

When the cooking start operation button 31 is pressed after the door 7 is closed, the cooking start operation lever 35 is rotated counterclockwise in FIG. 4, as shown in FIG. The opening/closing member 26 is moved to the upper switch closing position, and the cooking switch 21 is
is becoming more and more closed. In addition, when the cooking switch 21 is in the closed state, the door opening operation button 3
0 is pressed, the door opening operation lever 34 is rotated counterclockwise in FIG.
As shown in the figure, the third operating lever 24 is rotated to a position away from the cooking switch 21, so that the cooking switch 21 is opened.

Next, the circuit configuration of the microwave oven configured as described above will be explained with reference to FIG. and latch switch 19 is fuse 4
The cooking switch 21 and the fuse 43 are connected in series together with the heating switch 3 and the heating cutter 44.
The monitor switch 20 is connected in parallel to both. The power supply circuit also includes a timer 46 set by a setting knob 45 on the front surface of the operation panel 29 shown in FIG. are connected in series,
For the power control switch 48 and the primary winding of the transformer 41, a fan motor 49,
The turntable motor 9 and heating cooking chamber lamp 50 are connected in parallel.

Next, the operation of the microwave oven constructed 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 first
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 actuating levers 22, 23, and 24 are rotated to close the latch switch 19, open the monitor switch 20, and place the opening/closing member 26 on the third actuating lever 24 close to the cooking switch 21.

In this state, use the switching knob 47 on the front of the operation panel 29 to set the power control switch 48 to a switching position suitable for the object to be heated.
When the timer 46 is set to an operating time suitable for the object to be heated using the setting knob 45, and then the cooking start operation button 31 is pressed, the opening/closing member 26 is opened via the cooking start operation lever 35. The cooking switch 21 is moved from the lower switch open position shown in the figure to the upper switch closed position shown in FIG. It is kept closed.
As a result, power is supplied to the magnetron 12, high frequency energy is supplied into the cooking chamber 2, and the object to be heated is heated and cooked.

When the door opening operation button 30 on the front surface of the operation panel 29 is pressed during this heating and cooking, the third operation lever 24
is rotated clockwise from the state shown in FIG. 5, and at the beginning of the rotation, the locking portion 26b of the opening/closing member 26 is separated from the holding piece 27 and moved downward by its own weight and the action of the spring piece 28, which prevents cooking. switch 21
is opened and the operation of the magnetron 12 is immediately stopped. Note that even if grease or the like is used for lubrication between the opening/closing member 26 and the third operating lever 24, the action of the spring piece 28 can prevent oil sticking. And the third actuation lever 2
4 is further rotated, as shown in FIG. The latch 15A is also rotated to the release position and released from the latch 13a, and the door 7
is released from the locked 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 first operating lever 22, as shown in FIG. 7, and the latch switch 19 is opened. after that,
When the door 7 is opened, the latches 15A, 15 are in the released position.
b is moved forward from the vicinity of the hooks 13a and 13b, the second operating lever 23 is rotated from the solid line position to the chain line position in FIG.
0 is closed. Therefore, if the cooking switch 21 is not opened due to a malfunction or the like when the door 7 starts to open, the fuse 43 of the power supply circuit shown in FIG. 6 will melt as the monitor switch 20 closes. This makes it impossible to supply power to the magnetron 12, thereby avoiding the danger associated with the inability to open the cooking switch.

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, with this invention, only when the door is closed, the cooking switch can be closed by operating the second manual operation member and heating cooking using the magnetron can be started. At the same time, when the first manual operation member for releasing the latch is operated while the cooking switch is in the closed state,
The cooking switch is immediately opened before the door is opened, and the operation of the magnetron is stopped, resulting in an excellent effect that it can be used extremely safely.

[Brief explanation of the drawing]

Fig. 1 is a partial side sectional view showing the door locking structure and the related switch operating structure in a microwave oven embodying this invention, Fig. 2 is a perspective view showing the entire microwave oven, and Fig. 3 4 is a longitudinal sectional view of the main parts of the microwave oven, FIG. 4 is a side sectional view of the operating button and operating lever for starting cooking, and FIG. 5 is a side sectional view of the operating button and operating lever for opening the door.
FIG. 6 is a control circuit diagram of this microwave oven, and FIG. 7 is a partial side sectional view showing the operating state of FIG. 1. 1...Frame, 2...Heating cooking chamber, 7...
Door, 12... Magnetron, 13... Latching body, 1
3a, 13b...Latching portion, 15A, 15B...Latch, 21...Cooking switch, 24...Third operating lever, 26...Opening/closing member, 27...Holding piece as a holding member, 30...No. 1: an operation button for opening the door as a manual operation member; 31: an operation button for starting cooking as a second manual operation member.

Claims (1)

[Scope of Claim for Utility Model Registration] A latch 15A, 1 that is movable between a latching position and a release position on the door 7 that covers the heating cooking chamber 2 in an openable/closable manner.
5B, so that when the door 7 is closed, the latches 15A and 15B at the latching position engage with the latching portions 13a and 13b provided on the frame 1 to hold the door 7 in the closed state. In the microwave oven, the latch 1 is rotatably supported on the frame 1 in the vicinity of the latch 13b, and the latch 1 is rotatably supported between two positions.
5B and is rotated to one position by the engagement; and an actuating lever 24 that is disposed on the frame 1 so as to be located near the actuating lever 24 and is closed for actuating the magnetron 12. A cooking switch 21 is supported on an operating lever 24 so as to be movable between two positions, a switch open position and a switch closed position, so as to correspond to the cooking switch 21, and the operating lever 24 is held on one side by a latch 15B. an opening/closing member 26 that closes the cooking switch 21 by moving the cooking switch 21 to the switch closing position in a state where the cooking switch 21 is rotated at the position; a holding member 27 that engages with the opening/closing member 26 in the switch closed position to hold the opening/closing member 26 in the same position; and a holding member 27 arranged on the frame 1 so as to correspond to the operating lever 24 and actuated based on manual operation. a first manual operating member 30 for rotating the lever 24 from the one position to the other position; and a frame 1 corresponding to the opening/closing member 26.
The opening/closing member 26 is arranged on the top and opens and closes based on manual operation.
a second manual operation member 31 for moving the switch from the switch open position to the switch close position, and when the door 7 is closed, the operating lever 24 is moved to one side by engagement with the latch 15B in the latching position. When the second manual operation member 31 is operated in this state, the opening/closing member 26 is moved to the switch closed position and is held in the switch closed position by engagement with the holding member 27. Furthermore, in this state, the first manual operation member 30
When operated, the operating lever 24 is rotated to the other position, the opening/closing member 26 is separated from the holding member 27 and moved to the switch open position,
The latches 15A, 15 via the actuating lever 24
A microwave oven characterized in that B is configured to be moved from a latching position to a releasing position.