US3784776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic locking mechanism for a microwave oven
Assignee: Toshiba Corp
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Filing: 1971-04-14
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Granted: 1974-01-08
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Expires: 1991-04-14
Abstract
Abstract In a high frequency heating apparatus comprising a cabinet defining a heating chamber, a door for closing the heating chamber, a high frequency oscillator, and a timer for presetting the operating time of the oscillator, there are provided an electromagnetic locking mechanism which is energized together with the timer for locking the door in the closed position. Also provided is a switch operated by the locking mechanism for controlling the operation of the high frequency oscillator to deenergize the high frequency oscillator when the door is unlocked.
Inventors
- 👤 K Asanuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:07
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6414; H05B6/6417; Y; Y10; Y10S; Y10S292/00; Y10S292/69; Y10T; Y10T292/00; Y10T292/08; Y10T292/0801; Y10T292/0803; Y10T292/0805; Y10T292/0806; Y10T70/00; Y10T70/70; Y10T70/7006; Y10T70/7028; Y10T70/7051; Y10T70/7062; Y10T70/7119
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
In a high frequency heating apparatus comprising a cabinet defining therein a heating chamber with an access opening, a door for closing said access opening, a high frequency oscillator for radiating high frequency electromagnetic waves in said heating chamber, and a timer for presetting the operating time of said high frequency oscillator, the improvement which comprises: an electromagnetic locking mechanism mounted on said cabinet, said locking mechanism being energized together with said timer for locking said door to said cabinet, a switch disposed in said cabinet for controlling the operation of said high frequency oscillator, and means operatively coupled to said locking mechanism for actuating said switch in accordance with the operation of said locking mechanism such that operation of said high frequency oscillator is disabled when said locking mechanism unlocks said door and is enabled only when said locking mechanism locks said door.
Claim 2
Dependent Claim
144 words
In a high frequency heating apparatus comprising a cabinet defining therein a heating chamber with an access opening, a door for closing said access opening, a high frequency oscillator for radiating high frequency electromagnetic waves in said heating chamber, and a timer for presetting the operating time of said high frequency oscillator, the improvement which comprises: an electromagnetic locking mechanism mounted on said cabinet, said locking mechanism being energized together with said timer for locking said door to said cabinet, a switch disposed in said cabinet for controlling the operation of said high frequency oscillator, and means operatively coupled to said locking mechanism for actuating said switch in accordance with the operation of said locking mechanism such that operation of said high frequency oscillator is disabled when said locking mechanism unlocks said door and is enabled only when said locking mechanism locks said door.
Claim 3
Dependent Claim
38 words
The high frequency heating apparatus according to claim 1 wherein said locking mechanism comprises a coil and a spring biased locking rod operated by said coil to engage and disengage a locking rod receiving opening in said door.
Claim 4
Dependent Claim
56 words
The high frequency heating apparatus according to claim 1 wherein said locking mechanism comprises an electric coil disposed in said cabinet, an armature driven by said coil, an independent locking rod cooperating with a locking rod receiving opening in said door and with said switch, and a lever operatively interconnecting said armature and said locking rod.
Claim 5
Dependent Claim
37 words
The high frequency heating apparatus according to claim 1 wherein said heating apparatus further includes a hollow panel board mounted on said cabinet adjacent said door and said electromagnetic locking mechanism is positioned in said panel board.
Claim 6
Dependent Claim
17 words
The high frequency heating apparatus according to claim 3 wherein said lever is a spring biased lever.
Claim 7
Dependent Claim
36 words
The high frequency heating apparatus according to claim 5 wherein said lever is spring biased in such a direction as to normally maintain said high frequency oscillator disabled when said elecTromagnetic blocking mechanism is not operated.
Claim 8
Dependent Claim
27 words
The high frequency heating apparatus according to claim 2 wherein said means for actuating said switch includes a lever operatively interconnecting said blocking rod and said switch.
Claim 9
Dependent Claim
15 words
The high frequency heating apparatus according to claim 7 wherein said lever is spring biased.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |