JPH02118332A - Microwave oven - Google Patents

Abstract

PURPOSE:To increase the strength of the double-seaming joint by joining the front panel and components which constitute the oven chamber with the double- seaming-method, and inclining the double-seaming joint relative to the front panel. CONSTITUTION:The rim of the opening which is part of the double-seaming joint and situated in front of the front panel 2 is bent rearward relative to the plane of the front panel 2 to form an inclined bend 21, and the rim of the opening which is situated behind the front panel 2 is bent upwardly to form a bend 22. The bending width (a) of the bend 21 is equal to or less than the length (b) of the bend 22 so that when the double-seaming joint 20 is complete, the bending line 21a of the bend 21 may remain inside the double-seaming joint 20. The front end of the top panel 6 is bent upwardly to form a bend 23. The top end of the bend 23 is further bent forwardly to hold the bend 22 inside the space formed by the bend 23 for the double-seaming joint.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a microwave oven in which the assembly strength of the oven heating chamber is increased.

(Prior Art) Generally, an oven heating chamber includes a front plate 2 having an opening 1 for the food to be cooked, a side plate 4 integrally formed with a bottom plate 3, and a rear plate 5 integrally formed, as shown in FIG. The front plate 2 and the upper plate 6 are joined by spot welding 7 as shown in FIG. 5, and the front plate 2 and the side plates 4 are also joined by spot welding (not shown). ing.

When the oven heating chamber is formed using spot welding means, additional polishing is required to erase the spot weld marks, and irregularities in spot welding may result in defective welding.

Therefore, as shown in FIG. 6, the oven heating chamber is
A technical means has been developed that solves the above-mentioned difficulties by configuring the side plate 4 and the top plate 6 to be joined together by means of folding means 81.

(Problems to be Solved by the Invention) In a microwave oven constructed by joining a front plate 2 constituting an oven heating chamber and side plates 4 and a top plate 6, which are other constituent members, by a seam folding means 8, 10 because the strength of the seam fold joint in the direction is not so strong.
If a force on the order of kg is applied to the seam-fold joint, the seam-fold joint may become displaced.

In order to solve this problem, as shown in FIG. 7, a constricted part 9 that protrudes forward is provided around the opening of the front plate 2 constituting the oven heating chamber, and a seam-folded joint is provided within this constricted part 9. A method was proposed in which the joint was provided (Utility Model Application Publication No. 57-200806), but in this case, the joint part protrudes to the front, which not only does not give a clean appearance, but also deteriorates the sealing performance in this part, resulting in interference with radio waves. Leaks are also a problem.

Further, as shown in FIGS. 8 and 9, a plurality of projections 10 are provided at intervals on the joint piece 2a of the front plate 2, and the projections 10 correspond to the projections 10 on the joint piece 6a of the upper plate 6. By inserting the protrusion 10 provided on the seam-fold joint piece 2a of the front plate 2 into the hole 11 provided on the seam-fold joint piece 6a of the upper plate 6 at the seam-fold joint part, the seam-fold joint is formed. Technological measures to eliminate misalignment of joints
No. 8-41411) has also been developed, but even in this case, when a force of about 20 kg is applied, the joint strength is insufficient, such as displacement of the seam-fold joint.

The present invention has been made in view of the above-mentioned points, and is constructed by joining the front plate constituting the oven heating chamber and other structural members by a seam folding means, and increasing the strength of the seam folding joint. The purpose is to provide a microwave oven with

[Structure of the invention]

(Means for Solving the Problems) The microwave oven of the present invention is constructed by joining a front plate constituting an oven heating chamber and other constituent members by a seam folding means, and the joint surface of the seam folding joint part is It is designed to be inclined with respect to the front plate.

(Function) In the microwave oven of the present invention, since the joint surface of the seam-fold joint is inclined with respect to the front plate, it acts as a means to prevent the seam-fold joint from coming into contact with the bent part of the front plate. Therefore, the strength of the seam-folded joint increases and no misalignment occurs at the joint.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the same members as in FIG. 6 are given the same reference numerals.

In FIG. 1, reference numeral 20 denotes a seam-fold joint between the front plate 2 and the upper plate 6, and the area around the opening located on the front side of the front plate 2, which constitutes the seam-fold joint 20, is shown in FIG. As shown in the figure, a bent part 21 is formed which is bent backward and inclined with respect to the surface of the front plate 2, and a part around the opening located on the rear side of the front plate 2 is bent upward to form a bent piece 22. are doing.

For example, the bending width a of the bending portion 21 is set to be equal to or smaller than the length b of the bending piece 22,
When the cross-fold joint 20 is configured, the bending line 21a of the folded portion 21 is located within the cross-fold joint 20.

On the other hand, the front end portion of the upper plate 6, which is another component of the oven heating chamber and constitutes the seam-folded joint portion 20, is bent upward to form a bent piece 23. The upper end portion of this bent piece 23 is further bent forward, so that the bent piece 22 enters a space 24 formed in the bent piece 23 and is joined by half-folding.

Although not shown in the drawings, a similar bent piece is also formed at the joint between the front plate 2 and the side plate 4.

In other words, the periphery of the rectangular opening provided in the front plate 2 is a bent portion 2 that similarly slopes rearward with respect to the surface of the front plate 2.
1 is formed.

Thus, the oven heating chamber is divided into the front plate 2, side plate 4 and top plate 6.
In the case where the parts are joined together by a seam folding means,
As shown in FIG. 1, the joint surface of the joint 20 is inclined with respect to the front plate 2, so even if a force is applied in the direction of the arrow, one end of the joint 20 will come into contact with the bending line 21a. This prevents this folded joint from coming off.

〔Effect of the invention〕

As described above, according to the present invention, the front plate constituting the oven heating chamber and other structural members are joined together by folding, and the joint surface of the folding is inclined with respect to the front plate. The strength of the joints has increased, and even when the oven heating chamber is heated, the joints will not come apart due to internal stress due to thermal expansion, and when the user cleans the oven heating chamber, the joints will not come off even if force is applied. This has the advantage that there is no noise caused by noise.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the joint of the front plate and top plate forming the oven heating chamber of the microwave oven according to the present invention, FIG. 2 is a diagram showing the joint of the front plate and the top plate, and FIG. FIG. 4 is an exploded perspective view showing the oven heating chamber of a microwave oven; FIGS. 5 to 7 are views showing the oven heating chamber of a conventional microwave oven; FIGS. FIG. 9 is a diagram showing a joint between a front plate and an upper plate forming an oven heating chamber of a conventional microwave oven. 2...Front plate, 3...Bottom plate, 4...Side plate 4.5...
・Rear plate, 6...Top plate, 20...Haze fold joint, 2
1...Bending portion, 21a...Bending line, 23.
...Bent piece. Figure 5 Figure 6 Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A microwave oven in which a front plate constituting an oven heating chamber and other constituent members are joined by a seam folding means, characterized in that the joining surface of the seam fold joint is inclined with respect to the front plate. microwave oven.