Electric heating – Microwave heating – With control system
Patent
1998-04-06
2000-03-28
Leung, Philip H.
Electric heating
Microwave heating
With control system
219724, 219739, 126197, 292 95, H05B 676
Patent
active
060434732
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a high frequency heating apparatus having a door of a microwave oven or microwave oven-range provided with a switch function, so as to turn off the switch and stop oscillation of microwaves when the door is opened, and to turn on the switch and start oscillation of microwaves when the door is closed.
BACKGROUND ART
In the conventional microwave oven having a laterally opening door, the role of the switch for stopping oscillation of microwaves for cooking and heating is provided by combination of a door key formed in the door and the door hook formed in the main body, and the latch switch is cut off when the door is opened and the latch switch is turned on when the door is closed, and by turning on the operation switch of the main body, oscillation of microwaves is started. The door key and door hook are composed so as to be engaged with each other as the mutual contact surfaces slide to be engaged with each other, and the sliding surfaces were coated with grease to have lubricity, and the sliding surfaces were prevented from being abraded and worn out during use so that, finally, the latch switch may not fail to work.
For grease application on the sliding surfaces, however, uneven coating tends to occur, and the sliding becomes poor when coating is insufficient, and abrasion of the sliding surfaces may increase, and the microwave oven may fail to work if the door is closed. Besides, as the grease is applied on the sliding surfaces, it may be discolored due to contamination or deterioration in a long course of use, and the appearance becomes poor.
DISCLOSURE OF THE INVENTION
In the light of the above background, it is a primary object of the invention to present a high frequency heating apparatus characterized by specifying the material used in the door key or door hook, so as to be free from switch trouble due to abrasion of sliding parts in a long course of use without applying grease on the sliding parts of the door key and door hook. It is also an object of the invention to eliminate defective appearance due to contamination or deterioration of grease by not applying grease on the sliding parts.
To achieve the objects, according to first means of the invention, the door key is made of a resin filled with acicular crystal of which Mohs' hardnesses is lower than that of glass fiber, and the door hook to be engaged with the door key is made of a resin material filled with glass fiber.
According to second means of the invention, the door key is made of a resin filled with at least one of acicular crystals of potassium titanate, calcium metasilicate, magnesium pyroborate, barium titanate, and zinc oxide of which Mohs' hardness is lower than that of glass fiber, and the door hook to be engaged with the door key is made of a resin material filled with glass fiber.
According to third means of the invention, the door key is made of a resin filled with at least one of acicular crystals of potassium titanate, calcium metasilicate, magnesium pyroborate, barium titanate, and zinc oxide of which Mohs's hardness is lower than that of glass fiber, with the diameter of acicular crystal being 0.1 .mu.m or more and 50 .mu.m or less, and the door hook to be engaged with the door key is made of a resin material filled with glass fiber.
According to fourth means of the invention, the door key is made of a resin filled with acicular crystal of which Mohs' hardnesses is lower than that of glass fiber, and the door hook to be engaged with the door key is made of a resin material filled with glass fiber, with the resin surface roughness of the door key being smaller than the resin surface roughness of the door hook.
The invention, being thus constituted, can prevent malfunction due to abrasion by sliding of the door key and door hook by opening and closing of the door without applying grease on the sliding parts of the door key and door hook. It is also free from defective appearance due to contamination by application of grease on the sliding parts of the door key and door
REFERENCES:
patent: 3865097 (1975-02-01), Robinson
Isogai Mamoru
Kai Toshio
Leung Philip H.
Matsushita Electric - Industrial Co., Ltd.
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