US3875372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for a self-cleaning oven
Assignee: White Consolidated Industries Inc
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Filing: 1974-08-30
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Granted: 1975-04-01
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Expires: 1994-08-30
Abstract
Abstract A locking mechanism for a self-cleaning oven includes an elongated latching rod having a latch lock portion for firm engagement with a slot in the oven door, and a spring bias coupling between the latching rod and drive motor therefor maintains the door under pressure when locked to deform the door seal preventing heat leaks during self-cleaning. The latching rod is supported within the oven frame in a channel, and a rivet connected to the former is positioned for movement within a cam slot in the latter to provide for pivoting of the latching rod during movement to and from engagement with the door. When the oven selector switch is in self-clean position, the door is closed and the timer is set, the control circuit for the selfcleaning oven automatically energizes the drive motor to lock the door; and at the expiration of the cleaning time set on the timer and the dropping of the oven temperature to a predetermined safe level, the control circuit again automatically energizes the drive motor to unlock the door.
Inventors
- 👤 John W Gilliom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:15
CPC Classifications
F; F24; F24C; F24C14/00; F24C14/02; F24C15/00; F24C15/02; F24C15/022; F24C7/00; F24C7/08; F24C7/087
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
257 words
In a control circuit for a self-cleaning oven including a selector switch for multiple mode oven operation using broil and bake electrical heating elements selectively coupled for energization with at least one of said heating elements being energizable during self-cleaning operation, a timer for controlling the duration of self-cleaning operation, and an oven door lock and electrical drive therefor energizable to lock and to unlock the oven door, the improvement comprising: lock and unlock circuits for energizing said electrical drive respectively to lock and to unlock the oven door, the selector switch providing a connection for potential energization of said lock and unlock circuits when in the self-cleaning position; electrical drive control means actuated by the electrical drive for alternately connecting the latter to one of said lock and unlock circuits; timer operated switch means for coupling said lock and unlock circuits to a source of electrical energy to energize the electrical drive to lock and to unlock the oven door; whereby for commencing self-cleaning oven operation said electrical drive control means connects the electrical drive to said lock circuit and energization of the timer controls said timer operated switch to provide electrical power to said lock circuit to operate the electrical drive to lock the oven door, and at the completion of the self-cleaning oven operation said electrical drive control means connects the electrical drive to said unlock circuiT and after the expiration of the timer the timer operated switch provides power to said unlock circuit to operate said electrical drive to unlock the oven door.
Claim 2
Dependent Claim
257 words
In a control circuit for a self-cleaning oven including a selector switch for multiple mode oven operation using broil and bake electrical heating elements selectively coupled for energization with at least one of said heating elements being energizable during self-cleaning operation, a timer for controlling the duration of self-cleaning operation, and an oven door lock and electrical drive therefor energizable to lock and to unlock the oven door, the improvement comprising: lock and unlock circuits for energizing said electrical drive respectively to lock and to unlock the oven door, the selector switch providing a connection for potential energization of said lock and unlock circuits when in the self-cleaning position; electrical drive control means actuated by the electrical drive for alternately connecting the latter to one of said lock and unlock circuits; timer operated switch means for coupling said lock and unlock circuits to a source of electrical energy to energize the electrical drive to lock and to unlock the oven door; whereby for commencing self-cleaning oven operation said electrical drive control means connects the electrical drive to said lock circuit and energization of the timer controls said timer operated switch to provide electrical power to said lock circuit to operate the electrical drive to lock the oven door, and at the completion of the self-cleaning oven operation said electrical drive control means connects the electrical drive to said unlock circuiT and after the expiration of the timer the timer operated switch provides power to said unlock circuit to operate said electrical drive to unlock the oven door.
Claim 3
Dependent Claim
36 words
A control circuit as set forth in claim 1, further comprising thermostat switch means coupled in said lock and unlock circuits for preventing energization of said electrical drive when the oven temperature exceeds a predetermined level.
Claim 4
Dependent Claim
50 words
A control circuit as set forth in claim 1, wherein said electrical drive control means comprises a single pole double throw switch having a movable contact movable between first and second fixed contacts coupled, respectively, to said lock and unlock circuits, said movable contact being coupled to said electrical drive.
Claim 5
Dependent Claim
57 words
A control circuit as set forth in claim 1, wherein said timer operated switch means comprises a single pole double throw switch having first and second fixed contacts coupled, respectively, to said lock and unlock circuits and a further contact movable to connection with either of said first and second fixed contacts under control of the timer.
Claim 6
Dependent Claim
35 words
A control circuit as set forth in claim 1, further comprising door interlock switch means responsive to closure of the oven door for completing said lock and unlock circuits for energization of said electrical drive.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |