JPH0144975Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The invention provides a latch lever protruding from the open/close free end side of the door, and inserts the latch lever into an opening provided in the front plate of the heating chamber to open/close the safety switch. Regarding the microwave oven that responds.

<Prior art> Among the laws and regulations related to the safety standards of microwave ovens, there is a stipulation that ``a safety switch (latch switch) must not be operated by a rod with a diameter of 3 mm and a length of 100 mm from the front of the microwave oven.'' In order to satisfy these requirements, measures were taken as shown in Japanese Utility Model Application Publication No. 49-77550.

The structure will be briefly explained based on FIGS. 1 and 2.

Figure 1 is an external perspective view of the microwave oven, and Figure 2 is a horizontal cross-sectional view of the main parts showing its structure. In the figure, 1 is the microwave oven body, 2 is the heating chamber, 3 is the door, 4 is the heating switch, and the timer. Operation panel with etc., 5
6 is a door rotation shaft that rotates the door 3 in the directions of arrows A and B; 6 is a latch lever that projects linearly inside the open/close free end side 3' of the door 3; and 7 is a heating chamber front plate 8.
A safety switch (not shown) is provided inside the opening 7 and is operated by a latch lever 6 inserted through the opening 7 to open and close the door. 9 is an arrow mark P on the inside of the heating chamber front plate 8;
The shutter is provided to be movable in the Q direction (horizontal direction), and an opening 10 through which the latch lever 6 is inserted is provided in the center.

The width of the opening 10 was set to less than 3 mm, and the thickness of the latch lever 6 was made slightly smaller than the width of the opening 10 to satisfy the above-mentioned safety standards.

<Problems to be solved by the invention> By the way, the shutter 9 is movable in the left and right direction.
Providing the door on the inside of the heating chamber front plate 8 not only causes an increase in cost, but also causes poor quality in that the door cannot be opened and closed smoothly due to poor movement.

<Means for solving the problems> The present invention attempts to solve the above problems by changing the dimensions of the opening 7 of the heating chamber front plate 8 to the dimensions of the opening 10 provided in the center of the shutter. The problem is solved by making the shape of the protrusion of the latch lever 6, viewed from a direction parallel to the door rotation axis 5, coincide with a rotation arc centered on the door rotation axis 5.

<Function> Since the protruding tip or protruding base of the latch lever 6 moves on a rotation arc centered on the door rotation axis 5, the gap with the opening 7 of the heating chamber front plate 8 becomes approximately constant, and the opening 7 The dimensions of can be reduced.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 3 is a sectional view of a main part of a microwave oven showing an embodiment of the present invention, and parts having the same functions as those of the conventional example are given the same reference numerals, and the explanation thereof will be omitted.
Reference numeral 11 denotes a latch lever that is protruded from inside the open/close free end side 3' of the door 3, with the shape of the protruding direction matching a rotation arc of radius R centered on the rotation axis (not shown) of the door 3. It is. Reference numeral 12 designates a heating chamber front plate having an opening 13 through which the latch lever 11 is inserted, provided inside a restricting piece 14. The width t of the opening 13 is set to less than 3 mm, and the conventional shutter mechanism provided inside the heating chamber front plate 12 has been removed.

Next, to briefly describe the operation of the embodiment of the present invention having the above configuration, when the door 3 is rotated in the direction of the arrow A, the latch lever 11 moves along a trajectory that draws an arc of radius R from the rotation axis of the door 3. Since the latch lever 11 is formed in the same shape as the circular arc,
rotates on the same arc of radius R from the tip 11' to the base, and the gap between the latch lever 11 and the opening 13 is approximately constant, and as in the conventional case, the latch lever 11 is attached to the front plate 12 of the heating chamber, which is sufficiently larger than the thickness of the latch lever 11. There is no need to provide an opening.

<Effects> With this invention, the opening size of the front plate of the heating chamber can be made the size of the opening provided in the conventional shutter, and cost reduction can be achieved by eliminating the conventional shutter. Furthermore, it is possible to eliminate quality defects such as doors not opening and closing smoothly.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a microwave oven, FIG. 2 is a sectional view of a main part of a microwave oven showing a conventional example, and FIG. 3 is a sectional view of a main part of a microwave oven showing an embodiment of the present invention. 1...Microwave oven body, 2...Heating chamber, 3...
Door, 5...Door rotation shaft, 11...Latch lever, 12...Heating chamber front plate, 13...Opening.

Claims (1)

[Scope of claim for utility model registration] A latch lever is provided protruding from the free opening/closing end of the door,
In a microwave oven in which the latch lever is inserted into an opening provided in the front plate of the heating chamber and a safety switch provided on the microwave oven body side is activated in response to opening and closing of the door, the protrusion of the latch lever when viewed from a direction parallel to the door rotation axis. A microwave oven characterized in that the shape of the part corresponds to a rotation arc centered on a door rotation axis.