JP2001223071A - Door of microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent a door from falling off from a microwave oven main body without adding another parts. SOLUTION: A protrusion 3a, extending from the end part of front surface side of a choke cover 3, supporting a pin 8 through a pin-mounting plate 7, is installed inside a hinge housing part 3e, formed at the corner part of the choke cover 3, mounted on a door 20. In the state that a hinge 9, protruding from the front side of the microwave oven main body 30, is opposed to the lower part of the pin 8, at the inside of the hinge housing part 3e, the door 20 is brought closer to the microwave oven main body 30. At this time, a protrusion 3a is pushed out to the shunting position by the front end part of the hinge 9. When the pin 8 fitted in a hole 9a of the hinge 9 from upside, the door 20 with the protrusion 3a moves downward and front end part of the hinge 9 becomes untouched with the protrusion 3a. Accordingly, the protrusion 3a returns to the exposed position by elastic force, and the hinge 9 is held between the pin mounting plate 7 and the protrusion 3a, and upward and downward movement of the door 20 is restricted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven door which can be freely opened and closed with respect to a microwave oven body.

[0002]

2. Description of the Related Art Various types of microwave oven doors have been proposed for the purpose of reducing the number of parts and improving the workability of assembly. For example, JP-A-8-219468
In the configuration disclosed in Japanese Patent Application Laid-Open Publication No. H10-115, as shown in FIGS. 9 and 10, a plurality of holes for sealing radio waves and observing the inside are provided at the center of a door panel 21 made of a conductive material. A choke portion 26 for electromagnetic sealing having a see-through window 25 and an opening surface is provided on the door panel 21.
A frame-shaped choke cover 23 is attached to the door panel 21 over the entire periphery so as to cover the opening of the choke portion 26 from the rear surface of the door panel 21. The frame-shaped door frame 22 is attached to the door panel 21 from the front to the peripheral side. The transparent rear glass 35 facing the heating chamber side is adhered to the outer periphery of the see-through window 25 via a silicone adhesive, while the front glass 36 forming the front surface of the door 40 is attached to the inner periphery of the frame-shaped door frame 22. Part.

In a general manufacturing process of a conventional microwave oven, the door 40 is assembled in another manufacturing process (for example, an outsourcing factory), and the assembled door 40 is attached to a microwave oven main body 50 to mount the microwave oven. I try to complete it. In the operation of attaching the door 40 to the microwave oven main body 50, the pin mounting plate 27
The pin 28 attached via the
It is fitted into the hinge 29 fixed to 0 from above. In this state, the door 40 does not move downward,
It moves upward and comes off the hinge 29.

Therefore, in the configuration disclosed in Japanese Patent Application Laid-Open No. Hei 8-219468, a first choke cover 23a and a second choke cover 23b, in which the choke cover 23 is freely engageable with each other at the upper corner cutout, are formed. The door panel 21 is divided into two parts and only the first choke cover 23a is provided.
When the door 40 is assembled to the microwave oven body 50 when the door 40 is mounted on the microwave oven main body 50, the second choke cover 23b is engaged with the first choke cover 23a, and the remaining opening of the choke portion 26 is opened. It is trying to block.

With this configuration, the second choke cover 23
In a state where b is engaged with the first choke cover 23a, a part of the second choke cover 23b is disposed below the hinge 29. Therefore, even if the door 40 is moved upward, a part of the second choke cover 23b abuts on the hinge 29 and functions as a stopper. This allows door 4
No. 0 moves upward and does not fall off the hinge 29, and is securely supported on the microwave oven main body 50 with the pin 28 as a rotation axis.

[0006]

However, in the structure disclosed in Japanese Patent Application Laid-Open No. HEI 8-219468, the second choke cover having a stopper function is attached to the microwave oven body and the door when the door is attached to the microwave oven body. In this case, it is necessary to provide a separate part, and attach it to a predetermined position of the first choke cover which constitutes a part of the assembled door. For this reason, there is a problem that manufacturing costs increase due to an increase in the number of parts. In addition, in the work of attaching the door to the microwave oven main body, not only a step of attaching the second choke cover is added, but also it is necessary to manage the second choke cover which is a part separate from the microwave oven main body and the door. There is a problem that the workability of the work deteriorates. Furthermore, since an unconventional second choke cover mounting process is added, there is a high possibility that an operation error occurs, and there is also a problem that the product yield is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to reliably prevent the door from falling off from the microwave oven body without adding another part, and to increase the manufacturing cost due to an increase in the number of parts.
The door can be securely attached to the microwave main body without increasing the number of processes and the number of parts to be managed during mounting work of the door to the microwave main body, thereby deteriorating workability and reducing the yield of products. It is to provide a microwave oven door.

[0008]

The present invention has the following arrangement as means for solving the above-mentioned problems.

(1) A frame-shaped door panel in which a choke portion for an electromagnetic seal having an opening surface is formed along an outer peripheral edge, and is mounted on the door panel so as to cover the opening surface of the choke portion and to partially hinge. In a microwave oven door including a choke cover formed with a hinge storage portion for storing and a pin fitted into the hinge stored in the hinge storage portion from above, and supported on the front surface of the microwave oven body via the hinge so as to be openable and closable, A projection elastically deformable is formed integrally with a part of the choke cover between an exposed position and a retracted position with respect to the bottom surface side of the hinge in the hinge storage portion.

In this configuration, the protrusion is elastically deformed between the exposed position and the retracted position on the bottom side of the hinge in the hinge storage portion. Therefore, when the projection is located at the retracted position with respect to the bottom surface side of the hinge, the hinge is easily stored in the hinge storage portion, while when the projection is located at the exposed position with respect to the bottom surface side of the hinge, the hinge and the projection are located between the bottom surface of the hinge and the projection. Due to the contact, the upward movement of the door panel on which the chalk cover having the projection is mounted is reliably restricted, and the door panel attached to the microwave oven body does not fall off. The projection is formed integrally with a part of the choke cover mounted on the door panel. Therefore, it is not necessary to prepare separate parts for the work of attaching the door panel to the microwave oven body, so that the manufacturing cost rises due to the increase in the number of parts, the number of steps in the work of attaching the door to the microwave oven body, and the number of parts to be managed. There is no deterioration in workability due to the increase in the number of products, and no reduction in product yield.

(2) The projection comes into contact with a hinge inserted below the pin in the hinge accommodating portion, and moves from the exposed position to the bottom surface side of the hinge to the retracted position. It is characterized in that the hinge stops moving and the hinge moves from the retracted position to the bottom surface side to the exposed position.

In this configuration, when the hinge is inserted below the pin in the hinge housing, the projection comes into contact with the hinge, and the projection moves from the exposed position to the bottom surface of the hinge to the retracted position. When the pin is inserted into the hinge inserted below the pin, the projection stops contacting the hinge, and the projection moves from the retracted position to the bottom side of the hinge to the exposed position by elastic force. Therefore, by the operation for fitting the pin into the hinge in the hinge storage portion, the projection located at the exposed position with respect to the bottom surface side of the hinge once moves to the retracted position, then moves to the exposed position again, and the position above the door panel with respect to the hinge rises. It is not necessary to perform only work to regulate the transfer to the area.

(3) The projection is characterized in that the hinge is sandwiched between the projection and a support plate that supports the vicinity of the upper end of the pin at an exposed position on the bottom side of the hinge.

In this configuration, the hinge housed in the hinge housing is held between the support plate and the projection. Therefore, the vertical positional relationship between the hinge and the door panel having the protrusion is firmly maintained, and the door panel does not move in the vertical direction with respect to the hinge.

(4) The projection is formed so as to extend from a front end surface of the choke cover mounted on the door panel from the rear side.

In this configuration, the projection is formed to extend from the front end of the choke cover mounted with the front side facing the rear side of the door panel. Therefore, at the end of the choke cover on the front side that is open, the projection is formed easily integral with the choke cover and elastically deformable.

[0017]

FIG. 1 is a view showing an inner surface of a microwave oven according to an embodiment of the present invention when a door is opened. 2 is a cross-sectional view of a main part showing an internal structure of the door shown in FIG. 1, and FIG. 3 is a cross-sectional view of an AA part in FIG. A door 20 according to the present invention, which opens and closes an opening at the front of a heating chamber of a microwave oven and allows food to be taken in and out, is attached to a microwave oven main body 30 via a hinge 9. The door panel 1 includes a transparent window 5 made of a metal plate having a plurality of holes formed therein so that the inside of the heating chamber can be observed and a radio wave does not leak. And a metal choke portion 6 for radio wave sealing that is erected. As shown in FIG. 4, the choke portion 6 has U-shaped conductor comb teeth 6a and slits 6b formed at appropriate intervals, thereby forming an opening surface. By arranging the comb teeth 6a and the slits 6b evenly along the periphery of the door 20, a structure for preventing leakage of microwaves is obtained.

The U-shaped hinge 9 passes through the long hole 10a of the front plate 10 at the opening of the heating chamber, and is fixedly welded to the back of the side surface of the front plate 10. One end of the L-shaped pin mounting plate 7 is welded to the outer wall of the choke 6 near the upper and lower corners of the door panel 1. The upper end of the pin 8 is fixedly swaged to the other end of the pin mounting plate 7, and the pin 8 is rotatably supported by the pin mounting plate 7. Then, a transparent rear glass 15 is welded and joined to the see-through window 5 from the back surface of the door panel 1 with a room-temperature-curable or thermosetting silicone rubber. As described above, preparations for assembling the door panel 1 are completed.

Next, the windshield 16 is inserted into and engaged with an adhesive groove provided on the inner peripheral edge of the frame-shaped door frame 2. The door frame 2 is a resin molded product, and locking claws 2a are provided at appropriate intervals inside the outer peripheral edge thereof.
A handle (not shown) is integrally formed on the front surface of the door frame 2 on the side opposite to the side on which the hinge 9 is mounted.
The door frame 2 assembled to the door panel 1 for which the preparation has been completed is mounted so as to extend from the front surface of the door panel 1 to the peripheral side surface, and is fixed with screws (not shown). Then, the frame-shaped choke cover 3 is attached across the peripheral side surface of the door panel 1 so as to cover the opening surface of the choke portion 6 from the back surface of the door panel 1, and as shown in FIG. Stop claws 2a
And the fitting hole provided on the outer peripheral surface of the choke cover 3 are engaged to be integrated.

As described above, the choke cover 3 is mounted over the peripheral side surface of the door panel 1 so as to cover the opening surface of the choke portion 6, and as shown in FIG. Hinge storage portions 3e are formed at upper and lower two corners on the mounting position side of the hinge 9 among the four corners. The above-mentioned pin mounting plate 7 is exposed in the hinge storage part 3e, and supports the pin 8 in the hinge storage part 3e. The upper hinge storage portion 3 of the upper and lower corner storage portions 3e.
In e, an elastic projection 3a is provided.

FIG. 5 is a perspective view showing the structure of the main part of the choke cover of the microwave oven according to the present invention. The choke cover 3 is a substantially frame-shaped molded product having an outer peripheral wall 3b and an inner wall 3c, and a fitting hole 3d is appropriately provided in the outer peripheral wall of the choke cover 3. The choke cover 3 is mounted on the door frame 2 by fitting the locking claws 2a of the door frame 2 into the respective fitting holes 3d. The vertical angle on the hinge 9 side on the outer peripheral surface of the choke cover 3 is bent in a concave shape to form a hinge storage portion 3e. In this hinge storage portion 3e, a projection 3a extends from the part of the front end of the choke cover 3 to the front. Therefore, by appropriately setting the material of the choke cover 3 and the width and extension of the projection 3a, the projection 3a can be elastically deformable and integrally formed in the hinge storage portion 3e.

Next, the assembled door 20 is attached to the hinge 9 fixed to the microwave oven main body 30. FIG.
8 show the procedure for attaching the assembled door 20 to the hinge 9 fixed to the microwave oven main body 30. 6 (A), 7 (A) and 8 (A).
FIG. 3 is a cross-sectional view of the microwave oven main body 30 viewed from a side surface on the hinge 9 side in a state where the door 20 is arranged in parallel with the front surface of the microwave oven main body 30. 6 (B) and FIG.
(B) and FIG. 8 (B) are cross-sectional views of the microwave oven main body 30 in this state as viewed from above.

When attaching the door 20 to the microwave oven 30, as shown in FIG.
0 and the choke cover 3 of the door 20
The front end of the hinge 9 protruding from the front surface of the microwave oven 30 is opposed to the lower side of the pin 8 in the hinge accommodating portion 3e.

In this state, the door 20 is moved closer to the front of the microwave oven 30, and the hinge 9 is moved until the center of the hole 9a coincides with the center of the pin 8 as shown in FIG. At this time, the front end of the hinge 9 contacts the elastic projection 3a, and presses the projection 3a toward the front side of the door 20 in the hinge storage section 3e. As a result, the projection 3a is elastically deformed from a position on the back side (exposed position facing the bottom surface side of the hinge 9) in the hinge storage portion 3e to a position on the front side (retreat position not facing the bottom surface side of the hinge 9). .

When the center of the hole 9a of the hinge 9 matches the center of the pin 8, as shown in FIG. 8, the pin 8 is fitted into the hole 9a of the hinge 9 from above, and includes the pin 8 and the pin mounting plate 7. The door 20 moves downward with respect to the hinge 9. As a result, the hinge 9 is located between the pin mounting plate 7 and the projection 3a in the vertical direction, and the front end of the hinge 9 does not contact the projection 3a. Therefore, a force pressing the front side of the door 20 does not act on the protrusion 3e, and the protrusion 3e returns from the retracted position to the exposed position by elastic force and faces the bottom surface side of the hinge 9. The distance between the upper surface of the projection 3e and the bottom surface of the pin mounting plate 7 is substantially equal to the thickness of the hinge 9, and the hinge 9 is sandwiched between the pin mounting plate 7 and the projection 3e. As a result, the door 20 including the projection 3a and the pin mounting plate 7 cannot be moved vertically with respect to the hinge 9.

As described above, with the hinge 9 inserted into the hinge storage section 3e, the door 20 is
0, and only by moving the front end of the hinge 9 to the front side of the door 20 in the hinge storage portion 3e, the hinge 9 is sandwiched between the pin mounting plate 7 and the projection 3e, and the door 20 with respect to the microwave oven body 30 is moved. The door 20 can reliably prevent the door 20 from falling off from the microwave oven main body 30, and the front of the microwave oven 30 can be freely opened and closed, so that the door 20 is firmly attached to the microwave oven 30. Can be attached to

By setting the distance between the bottom surface of the pin mounting plate 7 and the upper surface of the projection 3a shorter than at least twice the thickness of the hinge 9, after the pin 8 is fitted into the hinge 9, The door 20 can be prevented from falling off from the microwave oven main body 30.

[0028]

According to the present invention, the following effects can be obtained.

(1) The projection is elastically deformed between the exposed position on the bottom surface side of the hinge and the retracted position in the hinge storage portion, so that the hinge is stored in the retracted position on the bottom surface side of the hinge. The hinge can be easily housed in the portion, and when the projection is located at the exposed position with respect to the bottom side of the hinge, above the door panel on which the choke cover having the projection formed by the contact between the bottom of the hinge and the projection is mounted. Can be reliably restricted, and the door panel attached to the microwave oven body can be prevented from falling off. In addition, since this projection is formed integrally with a part of the choke cover attached to the door panel, it is not necessary to prepare another part for the work of attaching the door panel to the microwave oven body, and the production cost is increased due to an increase in the number of parts. It is possible to prevent soaring, deterioration of workability due to an increase in the number of steps and an increase in the number of parts to be managed at the time of attaching the door to the microwave oven main body, and a reduction in product yield.

(2) When the projection is brought into contact with the hinge when the hinge is inserted below the pin in the hinge accommodating portion, the projection moves from the exposed position to the bottom surface side of the hinge to the retracted position, and is inserted below the pin. When the pin is fitted into the hinge, the projection no longer contacts the hinge, and the projection moves from the retracted position to the bottom side of the hinge to the exposed position by elastic force. Thereby, by the operation for fitting the pin into the hinge in the hinge storage portion, the projection located at the exposed position with respect to the bottom surface side of the hinge is once moved to the retracted position and then moved to the exposed position again, and the door panel for the hinge is moved. It is possible to eliminate the need for only work for restricting the upward movement of the vehicle.

(3) By sandwiching the hinge accommodated in the hinge accommodating portion between the support plate and the projection, the vertical positional relationship between the hinge and the door panel having the projection can be firmly maintained. The vertical movement of the door panel with respect to the hinge can be reliably restricted.

(4) By forming a projection extending from the front end of the choke cover that is mounted with the front side facing the rear side of the door panel, the choke cover is formed with an open front end. The projections can be easily integrated with the choke cover and formed to be elastically deformable.

[Brief description of the drawings]

FIG. 1 is a diagram showing an inner surface of a microwave oven according to an embodiment of the present invention when a door is opened.

FIG. 2 is a cross-sectional view showing a configuration of a main part of a door of the microwave oven.

FIG. 3 is a sectional view taken along the line AA in FIG. 2;

FIG. 4 is a perspective view showing a configuration of a main part of a choke section of the microwave oven.

FIG. 5 is a perspective view showing a configuration of a main part of a choke cover of the microwave oven.

FIG. 6 is a diagram showing a start state of a work of attaching a door to a main body in the microwave oven.

FIG. 7 is a view showing an intermediate state of the mounting operation.

FIG. 8 is a diagram showing an end state of the mounting work.

FIG. 9 is a diagram showing an inner side surface of a conventional microwave oven when a door is opened.

FIG. 10 is a cross-sectional view showing a configuration of a main part of a door of the conventional microwave oven.

[Explanation of symbols]

 3-Choke cover 3a-Protrusion 3e-Hinge storage portion 6-Choke portion 7-Pin mounting plate 8-Pin 9-Hinge 20-Door 30-Microwave oven body

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenji Kimura 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka F-term (reference) 3K090 AA15 AA16 GA01 GA03 GA04 GA07 3L086 AA01 BA07 BC02 BC06 CC25 DA23

Claims (4)

[Claims] 1. A frame-shaped door panel having a choke portion for an electromagnetic seal having an opening surface formed along an outer peripheral edge, and mounted on the door panel to cover an opening surface of the choke portion and partially accommodate a hinge. A door for a microwave oven, comprising: a chalk cover having a hinge storage portion formed therein; and a pin fitted into the hinge stored in the hinge storage portion from above, and supported by the front of the microwave oven body via the hinge so as to be openable and closable. A door for a microwave oven, wherein a projection elastically deformable is formed integrally with a part of a choke cover between an exposed position with respect to a bottom surface side of a hinge and a retracted position in a storage portion. 2. The projection according to claim 1, wherein the projection is in contact with a hinge inserted below the pin in the hinge accommodating portion, and moves from an exposed position to a bottom side of the hinge to a retracted position, and contacts the hinge with the pin fitted into the hinge. 2. The microwave oven door according to claim 1, wherein the door stops moving and moves from the retracted position to the bottom surface side of the hinge to the exposed position. 3. The microwave oven according to claim 1, wherein the projection sandwiches the hinge between a support plate that supports the vicinity of the upper end of the pin at an exposed position on the bottom side of the hinge. door. 4. The door of a microwave oven according to claim 1, wherein said projection is formed so as to extend from an end face on a front side of a choke cover mounted on a door panel from a back side. .