Patent US3823294A successfully refreshed from Google Patents.
US3823294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door locking system for an electrical apparatus
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1971-08-31
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Granted: 1974-07-09
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Expires: 1991-08-31
Abstract
Abstract A door locking system for an electrical apparatus is provided with a solenoid-operated contactor having contacts connected in the electrical circuit of the apparatus to which the system is applied. The energizing circuit for the solenoid of the contactor includes at least two switching means. One of the switching means is manually operable for controlling an electromagnetic drive coil that is connected with power supply through said one switching means. Lock means acting upon a door is operated by the drive coil. The other switching means is operated by the operation of the lock means.
Inventors
- 👤 T Takayama
- 👤 A Tanita
- 👤 S Hoshina
- 👤 T Ohtaguro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:23
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6414; H05B6/6417; F; F24; F24C; F24C15/00; F24C15/02; F24C15/022
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
Door locking system for a microwave oven, comprising a solenoid operated switch having its contacts connected in the primary circuit of a high tension transformer, first and second switching means connected in the energizing circuit for the solenoid of the switch, an electromagnetic drive coil connected with a power supply through the first switching means, and lock means responsive to the energization of the drive coil for locking the door of the oven after said door is closed, said second switching means being operated by the lock means when the latter is operated.
Claim 2
Dependent Claim
93 words
Door locking system for a microwave oven, comprising a solenoid operated switch having its contacts connected in the primary circuit of a high tension transformer, first and second switching means connected in the energizing circuit for the solenoid of the switch, an electromagnetic drive coil connected with a power supply through the first switching means, and lock means responsive to the energization of the drive coil for locking the door of the oven after said door is closed, said second switching means being operated by the lock means when the latter is operated.
Claim 3
Dependent Claim
63 words
Door locking system for a microwave oven according to claim 1, further including a cooking start switch having a normally open contact connected between the timer contacts and the drive coil, and a self-holding contact connected between the second switching means and the junction between the cooking start switch and the drive coil, said self-holding contact being included in the solenoid operated switch.
Claim 4
Dependent Claim
64 words
Door locking system for a microwave oven according to claim 1, further including a cooking start switch having a normally open contact connected with the drive coil on a remote side from the timer contacts, the junction between the cooking start switch and the drive coil being connected with a contact of the solenoid operated switch which is situated on the load side thereof.
Claim 5
Dependent Claim
50 words
Door locking system according to claim 1, in which the lock means comprises a core driven by the drive coil, latch means connected with the core, means receiving the latch means to lock it, said latch means and receiving means being separately provided on the electrical apparatus and the door.
Claim 6
Dependent Claim
17 words
Door locking system according to claim 4, in which the latch means operates the second switching means.
Claim 7
Dependent Claim
101 words
Door locking system for a microwave oven, comprising a solenoid operated switch having its contacts connected in the primary circuit of a high tension transformer, first and second switching means connected in the energizing circuit for the solenoid of said switch, an elEctromagnetic drive coil connected to a power supply through said first switching means, and locking means responsive to the energization of the drive coil for locking the door of the oven after said door is closed, said first switching means being manually operated, and said second switching means being operated by the lock means when the latter is operated.
Claim 8
Dependent Claim
101 words
Door locking system for a microwave oven, comprising a solenoid operated switch having its contacts connected in the primary circuit of a high tension transformer, first and second switching means connected in the energizing circuit for the solenoid of said switch, an elEctromagnetic drive coil connected to a power supply through said first switching means, and locking means responsive to the energization of the drive coil for locking the door of the oven after said door is closed, said first switching means being manually operated, and said second switching means being operated by the lock means when the latter is operated.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |