JPH0783445A - Door-adjusting mechanism for microwave oven - Google Patents

Abstract

PURPOSE:To surely prevent microwaves from leaking from an openable door, by a method wherein a latch hook is energized as a whole toward the rear inside of a microwave oven body and the latch hook can be adjusted and fastened to a place. CONSTITUTION:Since a latch hook 7 is always energized backward as a whole by the restoring force of hook springs 28, the latch hook 7 is always positioned at a most rear end X, in a range where the latch hook 7 can be moved forward and backward. However, when an openable door 4 is closed in order to be adjusted, the top ends of catch-engaged parts 6 each provided in the latch hook 7, which is positioned at the most rear bend X at this point of time, are required to be brought into contact with the top end parts 32 of abutment surfaces 31 on engaging catches 5 provided on the openable door 4. when the openable door 4 is closed, the catch-engaged parts 6 each abutting on the top end parts 32 of the abutment surfaces 31 on the engaging catches 5 slide on the abutment surfaces 31 to the extent of basal end parts 33, by presetting the elastic force of a door spring 12 and the elastic force of each of the hook springs 28. In this way, the clearance between the openable door and the front opening part of a microwave oven body can be surely removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door adjustment mechanism for a microwave oven which facilitates adjustment work of the opening / closing door and can reliably prevent leakage of radio waves from the opening / closing door.

[0002]

2. Description of the Related Art Conventionally, a mechanism for closing an opening / closing door of a microwave oven comprises an engaging pawl provided on the opening / closing door and a pawl engaging portion mounted in the main body of the microwave oven. Figure 8
Shows an example of a mechanism for closing the opening / closing door of such a conventional microwave oven, and the DD of the microwave oven shown in FIG.
It is a fragmentary sectional view which follows a line.

That is, an opening / closing door 54 is provided at the front opening 53 of the heating chamber 52 in the microwave oven main body 51, and the opening / closing door 54 projects from the inner surface side 542 of the opening / closing door 54 facing the heating chamber 52 to the microwave oven main body 51 side. An engaging claw 55 is provided. On the other hand, a latch hook 57 having a claw engaging portion 56 that engages with the engaging claw 55 is provided in the microwave oven main body 51 facing the engaging claw 55.

A pair of engaging claws 55 is provided in the vertical direction, and these engaging claws 55, 55 are integrally connected by a connecting rod 61. The connecting rod 61 is provided in the opening / closing door 54 so as to be vertically slidable,
As the connecting rod 61 slides in the vertical direction, the engaging claws 55,
55 moves up and down.

A locking piece 61 formed on the connecting rod 61
1, one end 621 of the door spring 62 is locked, and the other end 622 of the door spring 62 is locked to a locking piece 541 formed on the inner surface of the opening / closing door 54. Door spring 62
Is locked in an extended state between the locking pieces 541 and 611, so that the connecting rod 61 is always urged downward by the contracting force of the door spring 62.

On the other hand, the claw engaging portion 56 of the latch hook 57
Are provided at a position facing the engaging claws 55, 55, and these claw engaging portions 56 are fixed to the support frame 58 of the latch hook 57. Also, the latch hook 57
Is provided so as to be movable in the front-rear direction (left-right direction in FIG. 8) in the microwave oven main body 51, and for fixing the latch hook 57 at an arbitrary position as shown in FIGS. 9 and 10. The fixing screw 63 is attached to the support frame 58 of the latch hook 57 via the inner case body 65 of the microwave oven body 51. However, FIG. 9 is a partial cross-sectional view taken along the line EE shown in FIG. 8, and FIG. 10 is a schematic view of the fixing screw portion shown in FIG. 9 seen from the front.

That is, the support frame 58 has a fixing screw 63.
Is formed with a screw hole 68, and the inner case body 65 is formed with a long hole 69 that is long in the front-rear direction (lateral direction in the drawing). Then, the fixing screw 63 is inserted into the elongated hole 69 from the outside of the support frame 58 (on the side opposite to the latch hook 57), and is screwed into the screw hole 68 of the support frame 58. That is, the fixing screw 63 is configured to be slidable in the front-back direction within the elongated hole 69 formed in the inner case body 65 before tightening. As a result, the latch hook 57 to which the fixing screw 63 is attached is also movable in the front-rear direction within the slidable range of the fixing screw 63.

Reference numeral 72 in FIG. 8 is a door switch attached to the support frame 58, and is turned on / off by the engagement claw 55 engaged with the claw engagement portion 56. That is, when the engagement claw 55 is engaged with the claw engagement portion 56 (when the opening / closing door 54 is closed and in the state shown in FIG. 5), it is in the ON state, and when the engagement is released (the opening / closing door 54 is It is supposed to be off when it is opened.

According to the above construction, when the microwave oven is manufactured,
The manufacturing worker adjusts the latch hook 57 before the mounting of the microwave oven is completed and before the outer decorative case (not shown) is attached. That is, the opening / closing door 54 is closed with the latch hook 57 at an arbitrary position, and the opening / closing door 5 at that time is closed.
4 and the gap between the front opening 53 of the heating chamber 52 are confirmed.
After that, the opening / closing door 54 is once opened, and adjustment is performed to shift the entire latch hook 57 backward by the gap, and then the position of the latch hook 57 is temporarily fixed by the fixing screw 63, and the opening / closing door 54 is closed again. Check. Then, after confirming that the opening / closing door 54 and the front opening 53 are tightly closed without a gap, the fixing screw 63 is finally fixed.

[0010]

As described above, in the conventional microwave oven, adjustment work is necessary to ensure that the opening / closing door 54 is closed, but this adjustment work is narrow in the microwave oven main body 51. It was a work in a place, and the work was complicated and the workability was poor. Further, if the adjustment work is not performed reliably, a problem that radio waves during use of the microwave leak to the outside through the opening / closing door 54 or the gap will occur.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a door adjusting mechanism for a microwave oven which can easily prevent the electric wave from leaking from the opening / closing door by facilitating the adjustment work of the opening / closing door. To provide.

[0012]

In a microwave oven door adjusting mechanism according to the present invention, an opening / closing door is provided at a front opening of a heating chamber in a microwave oven main body, and the opening / closing door faces the heating chamber. In a microwave oven in which an engagement claw is provided on the inner surface side, and a latch hook having a claw engagement portion is provided in the microwave oven body facing the engagement claw,
Biasing means for biasing the entire latch hook backward in the microwave oven main body is provided, and fixing means capable of adjusting and fixing the latch hook at an arbitrary position is provided. Further, the biasing means is provided integrally with the latch hook.

[0013]

Since the latch hook is always biased rearward in the microwave oven main body by the biasing means, when the opening / closing door is closed and the engaging pawl is engaged with the pawl engaging portion, the opening / closing door is opened. The urging force of the urging means causes the microwave oven body to be brought into close contact with the front opening. Therefore, if the latch hook is fixed by the fixing means in this state, the engagement claw and the claw engagement portion are adjusted to have an optimum positional relationship. As a result, when the opening / closing door is closed, the front opening of the microwave oven body is tightly closed by the opening / closing door, so that no electric wave leakage occurs.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show the structure of a door adjusting mechanism of a microwave oven according to the present invention. However, FIG. 3 is a partially enlarged cross-sectional view taken along the line AA shown in FIG. In the figure, reference numeral 1 is a microwave oven main body, 3 is a front opening portion, 4
Is an opening / closing door, 5 is an engaging claw, 6 is a claw engaging part, 7 is a latch hook, 8 is a supporting frame, 11 is a connecting rod, 12 is a door spring,
13 is a fixing screw, 15 is an inner case body, 18 is a screw hole, 19 is an elongated hole formed in the inner case body 15, 22
Is a door switch, and the structure thereof is similar to that of the conventional structure shown in FIGS.

According to the present invention, in the above structure, the frame portion 81 of the support frame 8 of the latch hook 7 that faces the front plate 21 of the inner case body 15 that also forms the front opening 3 of the microwave oven body 1. A cylindrical concave portion 23 is formed in the, and a coil-shaped hook spring 28 is fitted and inserted into the concave portion 23. The opening 24 of the recess 23 has a front plate 21.
Since it is provided to face the hook spring 28
Is inserted into the recess 23 in a compressed state in which both ends are sandwiched by the front plate 21 and the bottom wall 25 of the recess 23 (mainly refer to FIG. 3).

Therefore, the entire latch hook 7 is always biased in the rearward direction (rightward in FIG. 1) by the restoring force (extension force) of the hook spring 28, and is always the last in the movable range in the front-back direction. It will be located at the end (position indicated by the solid line in FIG. 2) X.

However, although the movable range of the latch hook 7 in the front-rear direction is determined by the fixing screw 13 and the slot 19, the position of the rearmost end X in the movable range is particularly the position of the engaging claw 5 and the claw engagement. It must be determined based on the engagement relationship with the portion 6. That is, when the opening / closing door 4 is closed for door adjustment, the tip of the pawl engaging portion 6 provided on the latch hook 7 located at the rearmost end X at this point is the engagement provided on the opening / closing door 4. It is necessary to contact the tip 32 of the contact surface 31 of the claw 5 (state shown by the solid line in FIG. 2).

From this state, the engaging claw 5 and the claw engaging portion 6 are also provided.
In order to securely engage with the contact surface 31 of the engaging claw 5,
It is necessary for the claw engaging portion 6 that abuts the tip end portion 32 of the above to slide the abutting surface 31 to the base end portion 33. For that purpose, the contracting force of the door spring 12 is the restoring force (extending force) of the hook spring 28.
It is necessary to set it to be larger than.

That is, by setting the respective elastic forces of the door spring 12 and the hook spring 28 in this way, when the opening / closing door 4 is closed, the pawl engaging member that abuts against the tip portion 32 of the abutting surface 31 of the engaging pawl 5. Since the joint portion 6 slides the contact surface 31 to the base end portion 33, the latch hook 7 is pulled toward the opening / closing door 4 side in accordance with the sliding. That is, the distance L is drawn from the position shown by the solid line in FIG. 2 to the position shown by the broken line.

On the other hand, when viewed from the opening / closing door 4, the opening / closing door 4 is urged by the urging force of the hook spring 28 so as to be in close contact with the microwave oven body 1 side, that is, the front opening 3. . Therefore, by fixing the fixing screw 13 in this state, the positional relationship between the engaging claw 5 and the claw engaging portion 6 is adjusted to an optimum relationship. That is, the manufacturing operator may simply tighten the fixing screw 13 with the opening / closing door 4 closed before attaching the outer decorative case (not shown), and thereby the optimum door adjustment can be performed.

The second embodiment of the present invention is shown in FIGS.
As shown in FIG. 5, an elastic piece 35 serving as a biasing means is integrally formed on the front plate 34 of the latch hook 7, and the projection on the front side of the elastic piece 35 abuts on the front plate of the microwave oven main body 1. By biasing the latch hook 7 rearward by the elasticity of the elastic piece 35, it is not necessary to adjust the latch hook 7 as in the first embodiment.

[0022]

In the microwave oven door adjusting mechanism according to the present invention, the entire latch hook is provided so as to be movable back and forth in the microwave oven main body, and the latch hook is urged rearward in the microwave oven main body. Since the biasing means is provided and the fixing means capable of fixing the latch hook at an arbitrary position is provided, at the time of manufacturing the microwave oven,
The manufacturing operator can perform extremely simple work optimum adjustment of the door by simply fixing the latch hook by the fixing means with the opening / closing door closed. Therefore, the gap between the opening / closing door and the front opening of the microwave oven main body can be surely eliminated, so that it is possible to provide the microwave oven with excellent safety in which the electric wave leakage is surely blocked. Further, since the biasing means is formed integrally with the latch hook, the labor for attaching the biasing means is saved and
The number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the structure of a first embodiment of a door adjusting mechanism for a microwave oven according to the present invention, showing a state in which an engaging claw and a claw hook portion are securely engaged with each other. Is.

FIG. 2 is a schematic cross-sectional view showing a structure of a first embodiment of a door adjusting mechanism for a microwave oven according to the present invention, showing a state before an engaging claw is engaged with a claw hooking portion. .

FIG. 3 is a partially enlarged cross-sectional view taken along the line AA shown in FIG. .

FIG. 4 is a schematic cross-sectional view showing a second embodiment of the door adjusting mechanism of the microwave oven according to the present invention, showing a state where the engaging claw and the claw hooking portion are securely engaged with each other. .

5 is a partial cross-sectional view taken along the line BB shown in FIG.

6 is a partial cross-sectional view taken along the line CC shown in FIG.

FIG. 7 is a front view of a conventional microwave oven.

8 is a partial cross-sectional view taken along the line DD shown in FIG.

9 is a partial cross-sectional view taken along the line EE shown in FIG.

10 is a schematic view of a portion of the fixing screw shown in FIG. 9 as seen from the front.

[Explanation of symbols]

 1 Microwave Main Body 2 Heating Chamber 3 Front Opening 4 Opening / Closing Door 5 Engaging Claw 6 Claw Engaging Part 7 Latch Hook 13 Fixing Screw (Fixing Means) 28 Hook Spring (Biasing Means)

Claims (2)

[Claims] 1. An opening / closing door is provided at a front opening of a heating chamber in a microwave oven main body, and an engaging claw is provided on an inner surface side of the opening / closing door facing the heating chamber, and the engaging claw is opposed to the engaging claw. In the microwave oven in which a latch hook having a claw engaging portion is provided in the microwave oven body, the entire latch hook is provided so as to be movable in the front-rear direction in the microwave oven body, and the latch hook is provided in the microwave oven. A door adjusting mechanism for a microwave oven, characterized in that a biasing means for biasing backward is provided in the range main body, and a fixing means capable of adjusting and fixing the latch hook at an arbitrary position is provided. 2. The door adjusting mechanism for a microwave oven according to claim 1, wherein the biasing means is integrally provided on the latch hook.