JPH0526451A - Heater - Google Patents

Abstract

PURPOSE:To obtain a heater in which a door switch can be operated by a door key through a switch lever even if a tension of a spring for energizing the key is not increased and an undesired force is not applied to the switch through the lever. CONSTITUTION:The heater comprises a spring 4 for energizing downward a door key 2, a stopper 5 for engaging the key 2, rotatable switch levers 6a, 6b, 6c to be operated by the key 2, a lever shaft 11 for rotatably supporting the levers, door switches 7a, 7b, 7c to be respectively turned ON, OFF by the levers, and a switch mounting member 16 to be mounted with the switches. The stopper 5 and the shaft 11 are integrally molded with the member 16, and an elastic structure 13 is provided between door key contacts 8 of the levers and a door switch actuator 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device such as a microwave oven.

[0002]

2. Description of the Related Art In a microwave oven disclosed in Japanese Examined Patent Publication No. 3-6418, a switch lever is integrally molded with a switch mounting member to which a door switch is mounted, and a switch is operated by a door key that engages with a stopper when a door is closed. The lever is largely elastically deformed, and the door switch is turned on by this switch lever. Due to this elastic deformation, undesired force is not applied to the door switch from the switch lever. A spring is provided to urge the door key in a predetermined direction, that is, in a direction to engage with the stopper, in order to elastically deform the switch lever.

In this case, since the switch lever is largely elastically deformed, durability is poor. Also, since the switch lever has to be largely elastically deformed, the pulling force of the spring for urging the door key for operating the switch lever must be large, which requires an expensive spring and the door. When opening and closing the door, a large force against the spring force must be applied, which deteriorates the operability of the door.

[0004]

SUMMARY OF THE INVENTION According to the present invention, the door switch can be operated via the switch lever by the door key without increasing the tension of the spring for urging the door key. Provided is a heating device in which an undesired force is not applied via a switch lever.

[0005]

A heating device according to the present invention comprises a door for opening and closing a front opening of a heating chamber, a door key provided on the door, a spring for urging the door key in a predetermined direction, and the door. A stopper with which the door key is engaged when the door is closed, a rotatable switch lever that is operated by the door key when the door is closed, and a lever shaft that rotatably supports the switch lever, A door switch that is turned on / off by a switch lever, and a switch mounting member to which this switch is mounted, the stopper and the lever shaft are integrally molded with the switch mounting member, and the door key contacts the switch lever. An elastic structure portion is provided between the portion and the operation portion for operating the door switch. Further, the switch lever and the switch mounting member are made of different materials.

[0006]

When the door is closed, the door key that engages with the stopper rotates the switch lever via the lever shaft, and the switch lever turns on the door switch. After this turning on, the switch lever is slightly elastically deformed by the action of the elastic structure portion, and an undesired force is not applied from the switch lever to the door switch.

In this case, the force for rotating the switch lever is extremely small, the force for elastic deformation of the switch lever after the door switch is turned on is also small, and the pulling force of the spring for urging the door key may be small.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of the essential part of a microwave oven according to an embodiment of the present invention. A door 1 for opening and closing a front opening of a heating chamber (not shown) for microwave heating food is provided, and a pair of door keys 2 and 2 are vertically slidably arranged on this door. The pair of door keys 2 and 2 are connected to each other by a connecting member 3 and are urged by a spring 4 in a predetermined direction, that is, downward. On the other hand, a pair of stoppers 5 and 5 corresponding to the pair of door keys 2 and 2 are formed in the electrical equipment chamber adjacent to the heating chamber. The stoppers 5 and 5 close the door. At this time, the door keys 2 and 2 are urged by the spring 4 and engaged so as to keep the door closed.

First, second and third switch levers 6a, 6
b, 6c and the first, second and third door switches 7a, 7
b and 7c are near these stoppers 5 and 5. The first switch lever 6a has a bifurcated shape, and an abutting portion 8 with which the door key 2 abuts when the door is closed, a switch operating portion 9, and a cylindrical supporting portion 10 are integrally formed. As shown in detail in FIG. 2, the first switch lever 6a includes the support portion 1
The lever shaft 11 is mounted so as to pass through the inside of the shaft 0 and is rotatably supported by the lever shaft 11. A claw body 12 is provided in the vicinity of the lever shaft 11, and the claw body 12 is pushed by the support portion 10 during the mounting of the first switch lever 6a and bends away from the lever shaft 11, and when the mounting is completed, the original state is restored. To prevent the first switch lever 6a from coming off, facing the end of the support portion 10. And the first
In the switch lever 6a, the contact portion 8 and the operating portion 9 are
An elastic structure portion 13 made of a thin wall portion is formed between and between and near the base of the operation portion 9.

The first door switch 7a is fitted in the frame 14, and at this time, as shown in detail in FIG. 3, the claw body 15 penetrating the inside of the switch has the same function as the claw body 12 and the first door switch 7a. 7a is prevented from coming off.

The second and third switch levers 6b and 6c
The same applies to the structures relating to the second and third door switches 7b and 7c. Then, the door switches 7a, 7b,
A switch mounting member 16 for mounting 7c is provided, and the above-mentioned stoppers 5, 5, the lever shaft 11, the pawls 12, 15, and the frame 14 are integrally molded to this member, which simplifies the structure. Is being pursued.

In such a structure, when the door 1 is closed, the door keys 2 and 2 are urged by the spring 4 to engage the stoppers 5 and 5, and at this time, the tips of the door keys 2 and 2 are switched levers. The switch levers 6a, 6b, 6c are rotated via the lever shaft 11 by abutting against and pushing the abutting portions 8 of the 6a, 6b, 6c. Along with this rotation, the operating portion 9 of each switch lever 6a, 6b, 6c eventually pushes the knob of each door switch 7a, 7b, 7c, and each door switch 7a, 7b, 7c is turned on and off, and the heating chamber Microwave heating is possible. After this operation, even if the contact portion 8 is further pressed, the switch levers 6a, 6b, 6c are only slightly elastically deformed by the action of the elastic structure portion 13, and the switch levers 6a, 6b, 6c are not deformed. Undesired force is not applied to each door switch 7a, 7b, 7c.

Then, each of the switch levers 6a, 6
The force required to rotate b, 6c is extremely small, the force for elastic deformation of each switch lever 6a, 6b, 6c after each door switch is turned on is small, and the spring 4 for urging the door keys 2, 2 has a tensile force. A small one is used.

Further, the switch levers 6a, 6b,
6c is formed of a resin such as polyacetal or polypropylene, and the switch mounting member 16 including the lever shaft 11 and the like is formed of a resin such as 6 nylon containing glass or 66 nylon containing glass. In this case, the switch levers 6a, 6b, 6c and the lever shaft 11 are made of different materials, and if the materials are different as described above, the mutual slippage is improved and the switch levers 6 are
The a, 6b and 6c rotate smoothly, which contributes to the use of the spring 4 having a small tensile force as described above.

Thus, each switch lever 6a, 6b, 6
Since c has a small elastic deformation degree, it has good durability. Also,
The spring 4 does not need to be expensive because it may have a small tensile force, and the force against the force of the spring 4 at the time of opening and closing the door may be small and the door opening and closing operability is good.

[0016]

According to the present invention, the door switch can be operated via the switch lever by the door key without increasing the tension of the spring for urging the door key, so that the spring has a small tension. Therefore, an inexpensive spring can be adopted and the operability of opening and closing the door can be improved.

Further, since the switch lever is provided with the elastic structure, it is possible to prevent an undesired force from being applied to the door switch and prevent the door switch from being damaged.

Furthermore, since the amount of elastic deformation of the elastic structure portion of the switch lever can be reduced, the durability of the switch lever can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a microwave oven according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

1 door 2 door key 4 spring 5 stopper 6a First switch lever 6b Second switch lever 6c Third switch lever 7a 1st door switch 7b 2nd door switch 7c 3rd door switch 8 Contact part 9 Operation part 11 Lever shaft 13 Elastic structure 16 Switch mounting member

Claims (2)

[Claims] 1. A door for opening and closing a front opening of a heating chamber, a door key provided on the door, a spring for urging the door key in a predetermined direction, and the door key engaging when the door is closed. A stopper, a rotatable switch lever that is operated by the door key when the door is closed, a lever shaft that rotatably supports the switch lever, and a door switch that is turned on and off by the switch lever. A switch mounting member to which the switch is mounted, the stopper and the lever shaft are integrally molded with the switch mounting member, and a contact portion of the switch lever with which the door key abuts and an operating portion for operating the door switch. A heating device characterized in that an elastic structure portion is provided between the heating devices. 2. The heating device according to claim 1, wherein the switch lever and the switch mounting member are made of different materials.