US3752954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oven control
Assignee: Westinghouse Electric Corp
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Filing: 1971-12-20
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Granted: 1973-08-14
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Expires: 1991-12-20
Abstract
Abstract An oven control of the type having a bistable mechanism operable in accordance with oven temperature variations to effect opening and closing of snap-acting switch means series connected to directly control energization of the oven heating means is provided with a second creep action switch means which is operated between open and closed positions in accordance with the movement of the bistable mechanism, with the second switch means being connected in circuit means to provide control of any of various functions other than the main oven heating. The second switch means may control a door locking arrangement when the oven is of the self-cleaning pyrolytic type, or may be used to provide control of a safety signal for the oven, or to control auxiliary heating means in the oven whenever the temperature in the oven is below a predetermined level.
Inventors
- 👤 C Holtkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:55
CPC Classifications
H; H01; H01H; H01H37/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
146 words
An oven control comprising: a casing including an intermediate wall separating said oven control into a forward chamber and a rear chamber; circuit selector switch means in said front chamber for making selected connections to oven heating means; snap action switch means in said rear chamber adapted to be series connected to oven heating means for directly controlling the energization of said oven heating means; a bistable mechanism in said rear chamber for controlling said snap-action switch means; user adjustable means for setting different oven temperatures by shifting the operating point of said bistable mechanism; oven temperature responsive means acting upon said bistable mechanism to effect opening and closing of said snap-action switch means in accordance with oven temperature variations; and a second switch means in said rear chamber disposed to be operated between open and closed positions in accordance with positioning of said bistable mechanism.
Claim 2
Dependent Claim
146 words
An oven control comprising: a casing including an intermediate wall separating said oven control into a forward chamber and a rear chamber; circuit selector switch means in said front chamber for making selected connections to oven heating means; snap action switch means in said rear chamber adapted to be series connected to oven heating means for directly controlling the energization of said oven heating means; a bistable mechanism in said rear chamber for controlling said snap-action switch means; user adjustable means for setting different oven temperatures by shifting the operating point of said bistable mechanism; oven temperature responsive means acting upon said bistable mechanism to effect opening and closing of said snap-action switch means in accordance with oven temperature variations; and a second switch means in said rear chamber disposed to be operated between open and closed positions in accordance with positioning of said bistable mechanism.
Claim 3
Dependent Claim
49 words
An oven control according to claim 8, wherein: said oven control is connected to control said oven heating means for a self-cleaning pyrolytic oven adapted for both cooking and a cleaning operation, and includes oven door locking means; and said second switch is connected to control said locking means.
Claim 4
Dependent Claim
61 words
An oven control according to claim 1, wherein: said oven temperature responsive means applies force to said bistable mechanism in accordance with said oven temperature variations; and said force for operating said second switch means upon movement of said bistable mechanism is derived from a location generally aligned with the line of application of force of said oven temperature responsive means.
Claim 5
Dependent Claim
17 words
An oven control according to claim 1, wherein: said second switch means is of the creep-action character.
Claim 6
Dependent Claim
44 words
In an oven control according to claim 1: said bistable mechanism includes a relatively stiff but flexible leaf spring fulcrumed on said user adjustable means; and said second switch means includes a relatively more flexible leaf spring disposed transversely to said first leaf spring.
Claim 7
Dependent Claim
53 words
In combination with an oven control according to claim 1: an oven including auxiliary heating means for providing additional heat when said oven is below a predetermined relatively low temperature; and said second switch means of said oven control means is connected in circuit means for controlling operation of said auxiliary heating means.
Claim 8
Dependent Claim
51 words
In combination with an oven control according to claim 1: an oven including an electrically energized safety signal for said oven for indicating when the temperature of said oven is above a predetermined level; and said second switch means is connected in circuit means for controlling operation of said safety signal.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |