JP2695317B2 - Cooker switch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooker, and more particularly to a switch device for starting cooking which is linked with opening and closing of a door in a microwave oven which is manually operated.

[0002]

2. Description of the Related Art FIG. 6 shows the appearance of a conventional general manually operated microwave oven. A door 1 and an operation panel 2 are provided on the front side of the microwave oven main body. The operation panel 2 is provided with an open button 3 for opening the door 1, a cook button 4 for starting cooking, a timer knob 5 for setting a heating time, an output adjusting knob 6 for output control, and the like.

7 to 9 show operations related to opening and closing the door 1 and operating the open button 3 and the cook button 4 in the conventional microwave oven shown in FIG. In these figures, FIG. 7 shows a state in which the door 1 is closed, FIG. 8 shows a state in which the door 1 is closed and the cook button 4 is further operated, and FIG. 9 shows a state in which the open button 3 is operated.

In FIG. 7, the latch head 7 is formed with an L-shaped latch portion 7a, which is inserted into a latch hook 10 provided in parallel on the operation panel 2. The hook portion 7b provided at one end of the latch head 7 is biased downward in FIG. 7 by a spring. Along with this, the contact portion 7c below the latch portion 7a presses the cook lever 8. A step 8 a is provided near the center of the cook lever 8. The tip 8b of the cook lever 8 can be pressed by the cook button 4. The cook lever 8 is further provided with an arm 8c. The arm 8c can press the actuator 9a of the heating switch 9. In the state shown in FIG. 7, the step 8a is engaged with the step 10a of the latch hook 10 attached to the operation panel 2 to prevent the arm 8c from pressing the actuator 9a of the heating switch 9. The latch portion 7a of the latch head 7 also presses the actuator 11a of the door switch 11 to cause the door switch 11 to output a signal indicating that the door 1 is in the closed state. The cook lever 8 is provided with a long hole 8d into which the pin 12 is inserted. In this state, even if the door 1 is opened, the locking portion 7d formed on the latch portion 7a of the latch head 7 engages with the engaging protrusion 10b provided on the latch hook 10 to prevent the door 1 from opening. To prevent.

In FIG. 8, the tip 8b of the cook lever 8 is pushed by pressing the cook button 4.
It is pushed by the tip 4a of the. Cook lever 8 is pin 1
The shaft 8 is angularly displaced about 2, and the engagement between the step 8a and the step 10a of the latch hook 10 is released. The cook lever 8 is further angularly displaced downward in FIG. 8, and the actuator 8a of the heating switch 9 is pressed by the arm 8c. As a result, a signal for starting heating is derived from the heating switch 9.

In FIG. 9, by pressing the open button 3,
The open lever 13 is angularly displaced about the shaft 14.
The open lever 13 presses the protrusion 8e provided on the cook lever 8 to press the cook lever 8 and displace the cook lever 8 to the upper side in FIG. As a result, the arm 8c of the cook lever 8 separates from the actuator 9a of the heating switch 9, and the heating switch 9 is deactivated.
When the cook lever 8 is displaced upward, the latch head 7
The latch portion 7a is also displaced upward, the locking portion 7d is disengaged from the engaging portion 10b, and the door 1 can be opened.

FIG. 10 is a perspective view of a portion related to FIGS. 7 to 9. The cook button 4 presses the tip 8b of the cook lever 8. This allows the arm 8c to activate the actuator 9a of the heating switch 9. However, for this activation, the latch head 7
The latch portion 7a must be inserted through the insertion hole 15 as indicated by the arrow 16 to press the cook lever 8.
Therefore, when the door 1 is open, pressing the cook button 4 does not activate the heating switch 9.

[0008]

In the conventional switch device shown in FIGS. 7 to 10, the cook lever 8 is used.
And two parts of the open lever 13 are used to operate the heating switch 9 associated with the opening and closing of the door 1. In order to ensure the operation of the heating switch 9,
It is necessary to maintain the structure of the cook lever 8 and the open lever 13 with relatively high accuracy. In particular, since it is composed of two parts, the number of tolerances to be managed as a part is increased, and it is necessary to strictly control the dimensions in each tolerance. Further, both the cook lever 8 and the open lever 13 are dynamic parts, and it is necessary to make dimensional control more strict than static parts. This increases the manufacturing cost even as a component, and eventually increases the cost of a cooking device such as a microwave oven.

An object of the present invention is to provide a switch device for a cooking device, which can realize an equivalent function with one part, which has conventionally required two parts.

[0010]

DISCLOSURE OF THE INVENTION The present invention provides a cooker switch device which has a door for opening and closing an opening of a cooking chamber, and in which the cooking start switch can be turned on only when the door is closed. A latch member attached to a door, which can be displaced by being spring-biased in a direction substantially perpendicular to the opening / closing direction of the door, and can be displaced in the spring-biasing direction with the door closed. And a latch member that locks the latch member and the lever member that can be angularly displaced around an axis substantially perpendicular to the spring biasing direction of the latch member, and is pressed by the latch member on one side of the angular displacement direction. And a lever member having such a locking projection formed on the other side in the angular displacement direction, and a cooking start operation member that abuts the locking projection of the lever member when not operated and latches. The amount of angular displacement of the lever member due to the pressing of the member is Having a contact portion that limits within Mel range, and a fitting portion in which the engagement fitting the locking projection engages with allowing angular displacement of the lever member to outside of the predetermined at the time of operation,
Such a cooking start operation member, a switch activated by the angular displacement of the lever member outside the predetermined range at the time of operating the cooking start operation member, and a cooking stop operation member, An operation for stopping cooking, in which the lever member is angularly displaced in a direction opposite to the pressing direction by the latch member, and the latch member is displaced in a direction opposite to the spring urging direction to unlock the door. A switch device for a cooker, comprising: a member.

[0011]

According to the present invention, a latch member is attached to the door that opens and closes the opening of the cooking chamber. The latch member is spring-biased and displaceable in a direction substantially perpendicular to the opening / closing direction of the door. With the door closed, the latch member is displaced in the spring biasing direction to lock the door. The lever member that can be angularly displaced about an axis substantially vertical to the spring biasing direction of the latch member is pressed by the latch member on one side of the angular displacement direction and has a locking projection on the other side of the angular displacement direction. It is formed.
The engagement protrusion limits the amount of angular displacement of the lever member due to the pressing of the latch member by the contact portion when the cooking start operation member is not operated. When the cooking start operation member is operated, the locking projection of the lever member is fitted into the fitting portion provided on the operation member, and the angular displacement of the lever member is allowed to fall outside a predetermined range. This allowed angular displacement causes the lever member to activate the switch. When the cooking stop operating member is operated, the lever member is angularly displaced in the direction opposite to the pressing direction by the latch member, and the latch member is displaced in the direction opposite to the spring urging direction to unlock the door. This makes it possible to open the door and also deactivates the switch by means of the lever member. In this way, heating can be started only when the door is closed by one lever member,
When opening the door, the switch can be disabled at the same time.

[0012]

1 to 3 show a mechanism related to a door and a switch of a microwave oven according to an embodiment of the present invention. 1 shows the door closed, FIG. 2 shows the door closed and the cook button is operated, and FIG. 3 shows the open button operated to open the door.

In FIG. 1, the door 21 closes the cooking chamber in a substantially upright posture. An open button 23 and a cook button 24 are attached to the operation panel 22 side by side. In FIG. 1, the open button 23 arranged on the front side is removed for the sake of convenience. A support portion 24a and a groove 24b at the base thereof are formed at the tip of the cook button 24. The support portion 24a abuts on a locking projection 26a provided on the cook / open lever 26 that can be angularly displaced about the shaft 25, and controls the amount of angular displacement of the cook / open lever 26.

A latch head 27 is attached to the door 21. From the latch head 27, the latch part 27a is inserted into the main body of the microwave oven. The latch head 27 is spring-biased downward in FIG. 1, and the contact portion 27c presses the cook / open lever 26. The actuator 29a of the heating switch 29 is not activated because the locking projection 26a of the cook / open lever 26 abuts the support portion 24a to limit the angular displacement thereof. Locking part 2 of the latch head 27
7d engages with the engaging portion 30b of the latch hook 30, and the door 2
1 is prevented from opening in the direction of arrow 32.

FIG. 2 shows a state in which the cook button 24 is pressed. When the supporting portion 24a is displaced to the right side in FIG. 2, the engaging projection 26a of the cook / open lever 26 is moved to the supporting portion 24a.
Is fitted in a groove 24b provided at the base of the actuator, allows angular displacement of the arm 26c, activates the actuator 29a,
A signal for starting cooking is derived from the heating switch 9.
The fitting state of the locking projection 26a and the groove 24b continues, and the heating switch 9 is held in the active state.

In FIG. 3, by operating the open button 23, the release portion 26e of the cook / open lever 26, which is omitted in FIGS. 1 and 2, for convenience, is pushed. Groove 24 provided in association with locking projection 26a and cook button 24
The fitting state with b is released, the cook and open lever 26 is angularly displaced in the opposite direction, the latch head 27 is displaced upward, the locking portion 27d is disengaged from the engaging portion 30b, and the door 21 is opened. Is possible. In this state, the heating switch 29
Actuator 29a is disabled, and if the door 21 is opened in the direction of the arrow 32, the actuator 31 of the door switch 31
a is also immobilized.

FIG. 4 shows a schematic electric configuration of the microwave oven shown in FIGS. Electric power is supplied from the AC power supply 40 to the control circuit 41 via the contacts of the door switch 31. In response to the output from the heating switch 29, the control circuit 41 energizes the magnetron 42 when the heating switch 29 is activated and becomes conductive, and generates a high frequency for cooking. Further, it is needless to say that the heating may be performed by an electric heater or the like, that is, not only a microwave oven but also an oven or a toaster may be used as a cooking device.

FIG. 5 shows a configuration related to the latch head 27. The latch head 27 is transferred to the door panel 43 that constitutes the door 21, and is biased by the latch spring 44.

In the above embodiment, the shaft 25 has an axis parallel to the surface of the operation panel 22, but it is needless to say that it may be perpendicular to the spring biasing direction of the latch head 27, that is, the vertical direction. Is. Further, although the door switch 31 shown in FIG. 4 is interposed in the power supply line for the control circuit 41, it goes without saying that it may be given as an input signal to the control circuit 41.

[0020]

As described above, according to the present invention, one lever member is used in place of two members such as a conventional cook lever and an open lever to operate a switch linked with opening and closing of a door. You can As a result, the number of parts can be reduced, the dimensional control can be eased, and the manufacturing cost of the cooker can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view of one embodiment of the present invention.

FIG. 2 is a schematic side sectional view of an embodiment of the present invention.

FIG. 3 is a schematic side sectional view of an embodiment of the present invention.

FIG. 4 is a block diagram showing a schematic electrical configuration of the embodiment shown in FIGS.

5 is a perspective view showing a configuration related to a latch head 27 of the embodiment shown in FIGS. 1 to 3. FIG.

FIG. 6 is a perspective view showing an appearance of a general microwave oven.

FIG. 7 is a side sectional view showing a schematic configuration of a conventional microwave oven.

FIG. 8 is a side sectional view showing a schematic configuration of a conventional microwave oven.

FIG. 9 is a side sectional view showing a schematic configuration of a conventional microwave oven.

FIG. 10 is an exploded perspective view showing a configuration near a door of a conventional microwave oven.

[Explanation of symbols]

 21 Door 22 Operation Panel 23 Open Button 24 Cook Button 24a Support 24b Groove 25 Shaft 26 Cook and Open Lever 26a Locking Protrusion 26c Arm 27 Latch Head 27a Latch 27c Abutment 27d Locking 29 Heat Switch 29a Actuator 30 Latch Hook 30b Engagement part 31 Door switch 44 Latch spring

Claims (1)

(57) [Claims] 1. A switch device for a cooker, which has a door for opening and closing an opening of a cooking chamber, and in which a cooking start switch can be turned on only when the door is closed, a latch member attached to the door. And being displaceable by being biased by a spring in a direction substantially perpendicular to the opening / closing direction of the door, and being displaceable in the spring biasing direction with the door closed to lock the door. A latch member, and a lever member that can be angularly displaced about an axis substantially perpendicular to the spring biasing direction of the latch member, the lever member being pressed on one side in the angular displacement direction by the latch member and on the other side in the angular displacement direction. In such a lever member and an operating member for starting cooking, a corner of the lever member that is brought into contact with the locking protrusion of the lever member when not operated and is pressed by the latch member. Limiting the displacement amount within a predetermined range Such a cooking start operation member having a contact portion and a fitting portion which is fitted to the locking projection during operation to allow angular displacement of the lever member outside the predetermined range, and cooking start A switch that is activated by angular displacement of the lever member outside the predetermined range during operation of the cooking operation member; and a cooking stop operation member, which is operated in the direction of pressing the lever member by the latch member. A cooking device including such a cooking stopping operation member which is angularly displaced in the opposite direction, and the latch member is displaced in the direction opposite to the spring biasing direction to unlock the door. Switch device.