US3728512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency heating apparatus
Assignee: Sanyo Electric Co Ltd
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Filing: 1971-03-01
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Granted: 1973-04-17
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Expires: 1991-03-01
Abstract
Abstract In a high frequency heating apparatus including a cubiform cavity or oven of conductive material having an opening, a supply source for supplying high frequency energy into the cavity and a door for providing access to the cavity mounted so as to close the opening; a periphery of the door has a sash with a groove thereon extending along the periphery and a periphery surrounding the opening of the cavity has a sensing member with a protrusion for fitting in the groove when the door is closed. The sensing member is urged away from the peripherel surface of the cavity by virtue of a spring and when the door is closed the protrusion of the member is fitted in the groove. However, if a door is inadvertently closed with an obstacle such as a dishcloth sandwiched between both peripheries of the door and cavity, the obstacle depresses the protrusion and the sensing member is forced toward the peripheral surface of the cavity. A safety switch is provided in engagement with the sensing member for turning off the supply source in response to the depression of the member caused by the obstacle. Therefore, leakage of the high frequency energy caused by the sandwiched obstacle is prevented.
Inventors
- 👤 Y Shirakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:05
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6414; H05B6/6417
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
287 words
High frequency heating apparatus comprising: conductive enclosure means including a peripheral portion of electrically conductive material defining an opening into a cavity formed by said enclosure means, means for supplying high frequency electromagnetic wave energy into the cavity of said enclosure means, door means having a portion of electrically conductive material for closing the opening of said enclosure means by having said portion of electrically conductive material brought into opposed relationship with the peripheral portion of said enclosure means defining said opening, means for mounting said door means along a side thereof to said enclosure means to permit said door to be moved to open and close said opening of said cavity means, switch means mounted on said apparatus and connected in circuit with said means for supplying energy, an elongated stationary element having a groove therein substantially along its length mounted on said door means and extending for a substantial portion of the length of a side of said door means, an elongated actuating means mounted on said enclosure means, said actuating means including a spring strip and having a free end for actuating said switch means, said free end extending toward said door and having a projection thereon along its length which normally rests in said groove when the door is closed and an object is absent between said door means and said enclosure means, said actuating means being responsive to the presence of an object substantially at any location along the length of said sensing means between the groove of said stationary element and the projection of the actuating means when the door means is closed to be moved to a position to actuate said switch means to disable said means for supplying energy.
Claim 2
Dependent Claim
287 words
High frequency heating apparatus comprising: conductive enclosure means including a peripheral portion of electrically conductive material defining an opening into a cavity formed by said enclosure means, means for supplying high frequency electromagnetic wave energy into the cavity of said enclosure means, door means having a portion of electrically conductive material for closing the opening of said enclosure means by having said portion of electrically conductive material brought into opposed relationship with the peripheral portion of said enclosure means defining said opening, means for mounting said door means along a side thereof to said enclosure means to permit said door to be moved to open and close said opening of said cavity means, switch means mounted on said apparatus and connected in circuit with said means for supplying energy, an elongated stationary element having a groove therein substantially along its length mounted on said door means and extending for a substantial portion of the length of a side of said door means, an elongated actuating means mounted on said enclosure means, said actuating means including a spring strip and having a free end for actuating said switch means, said free end extending toward said door and having a projection thereon along its length which normally rests in said groove when the door is closed and an object is absent between said door means and said enclosure means, said actuating means being responsive to the presence of an object substantially at any location along the length of said sensing means between the groove of said stationary element and the projection of the actuating means when the door means is closed to be moved to a position to actuate said switch means to disable said means for supplying energy.
Claim 3
Dependent Claim
55 words
Apparatus as in claim 1 wherein said spring strip of the actuating means includes a portion of resilient electrically conductive material mounted to contact the electrically conductive portion of the opposed surface of the door when the door means is closed for sealing the cavity with respect to leakage of the high frequency electromagnetic energy.
Claim 4
Dependent Claim
30 words
Apparatus as in claim 1 wherein said actuating means located on said enclosure means has a portion bent to normally place the projection of the actuating means in said groove.
Claim 5
Dependent Claim
52 words
Apparatus as in claim 1 wherein said stationary element and said actuating means are located around at least the portions of said door means and said enclosure means surrounding the enclosure opening other than the side of the door means on which said means for permitting movement of the door are located.
Claim 6
Dependent Claim
43 words
Apparatus as in claim 1 wherein said switch means includes a conductive member mounted on said enclosure means to form onE contact of said switch means, said spring strip being of electrically conductive material to form the other contact of said switch means.
References Cited (Backward Citations)
US3544751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |