US3786218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable thermostatic device with snap switches
Assignee: EGO Elektro Geratebau GmbH
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Filing: 1971-11-18
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Granted: 1974-01-15
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Expires: 1991-11-18
Abstract
Abstract A regulator for a cooker hot plate or other heating appliance has a temperature sensing bulb filled with thermally expansible fluid and connected to a pressure bellows. An adjusting screw spindle acts on the bellows which acts in turn through a strut on a pivotally mounted, spring-biased pressure plate. The strut passes between two snap switches which are adapted to be closed by the pressure plate, acting on the switches through adjusting screws, such that the snap switches open at different temperatures. The pressure plate can include a resilient flexible portion by which the pressure plate is pivotally mounted and at the same time spring-biased towards the snap switches. Compensating bimetal means may be inserted between said pressure plate and said snap switches.
Inventors
- 👤 K Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:35
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0202; H05B1/0208; F; F24; F24C; F24C15/00; F24C15/10; F24C15/102; F24C15/105; H01; H01H; H01H37/00; H01H37/02; H01H37/10; H01H37/12; H01H37/22; H01H37/32; H01H37/36; H01H37/38
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
250 words
A regulator for an electric heating appliance, comprising a housing, a pressure bellows, a sensor element adapted to be exposed to the temperature of the electric heating appliance or of an object being heated thereby, means interconnecting said pressure bellows and said sensor element, a thermally expansible fluid in said pressure bellows, said interconnecting means and said sensor, a rotatable screw spindle, a direct coaxial connection between said screw spindle and said pressure bellows, manually operable adjusting means for rotating said screw spindle, at least two snap switches which are off in their free state, a substantially rigid pressure plate located on the side of the snap switches opposite the pressure bellows and overlying the snap switches, means pivotally mounting said pressure plate in said housing, a compression strut projecting between said snap switches for transmitting the superimposed regulating movement of the screw spindle and the expansion movement of the pressure bellows to said pressure plate, sprIng means biasing said pressure plate in the direction of the snap switches, adjusting screws operative between said pressure plate and respective ones of said snap switches so that the snap switches are kept in an ''''on'''' position until the compression strut lifts the pressure plate from the snap switches against said spring bias, said snap switches being adjusted relative to one another to operate at different temperatures, stop means for limiting movement of the pressure plate toward the snap switches, and compensating bimetal means inserted between said pressure plate and said snap switches.
Claim 2
Dependent Claim
250 words
A regulator for an electric heating appliance, comprising a housing, a pressure bellows, a sensor element adapted to be exposed to the temperature of the electric heating appliance or of an object being heated thereby, means interconnecting said pressure bellows and said sensor element, a thermally expansible fluid in said pressure bellows, said interconnecting means and said sensor, a rotatable screw spindle, a direct coaxial connection between said screw spindle and said pressure bellows, manually operable adjusting means for rotating said screw spindle, at least two snap switches which are off in their free state, a substantially rigid pressure plate located on the side of the snap switches opposite the pressure bellows and overlying the snap switches, means pivotally mounting said pressure plate in said housing, a compression strut projecting between said snap switches for transmitting the superimposed regulating movement of the screw spindle and the expansion movement of the pressure bellows to said pressure plate, sprIng means biasing said pressure plate in the direction of the snap switches, adjusting screws operative between said pressure plate and respective ones of said snap switches so that the snap switches are kept in an ''''on'''' position until the compression strut lifts the pressure plate from the snap switches against said spring bias, said snap switches being adjusted relative to one another to operate at different temperatures, stop means for limiting movement of the pressure plate toward the snap switches, and compensating bimetal means inserted between said pressure plate and said snap switches.
Claim 3
Dependent Claim
319 words
A regulator for an electric heating appliance, comprising a pressure bellows, a sensor element adapted to be exposed to the temperature of the electric heating appliance or of an object being heated thereby, means interconnecting said pressure bellows and said sensor element, a thermally expansible fluid in said pressure bellows, said interconnecting means and said sensor, a rotatable screw spindle, a direct coaxial connection between said screw spindle and said pressure bellows, manually operable adjusting means for rotating said screw spindle, a substantially rigid pressure plate, at least two parallel snap switches which are off in their free state and are located between said pressure bellows and said pressure plate, each snap switch underlying the pressure plate and including a switch spring with an electrical contact at one end thereof and a cooperating bowed snap spring adapted to effect movement of said switch spring and said electrical contact, a housing having an insulating block with recesses thereon for receiving said snap switches, said insulating block being located between said pressure bellows on one hand and said snap switches and said pressure plate on the other hand, means pivotally mounting said pressure plate in said housing, a compression strut projecting between said snap switches for transmitting the superimposed regulating movement of the screw spindle and the expansion movement of the pressure bellows to said pressure plate, spring means biassing said pressure plate in the direction of the snap switches, adjusting screws operative between said pressure plate and respective ones of said snap switches so that the snap switches are kept in an ''''on'''' position until the compression strut lifts the pressure plate from the snap switches against said spring bias said snap switches being adjusted relative to one antoher to operate at different temperatures, stop means for limiting movement of the pressure plate towards the snap switches, and compensating bimetal means inserted between said pressure plate and said snap switches.
Claim 4
Dependent Claim
319 words
A regulator for an electric heating appliance, comprising a pressure bellows, a sensor element adapted to be exposed to the temperature of the electric heating appliance or of an object being heated thereby, means interconnecting said pressure bellows and said sensor element, a thermally expansible fluid in said pressure bellows, said interconnecting means and said sensor, a rotatable screw spindle, a direct coaxial connection between said screw spindle and said pressure bellows, manually operable adjusting means for rotating said screw spindle, a substantially rigid pressure plate, at least two parallel snap switches which are off in their free state and are located between said pressure bellows and said pressure plate, each snap switch underlying the pressure plate and including a switch spring with an electrical contact at one end thereof and a cooperating bowed snap spring adapted to effect movement of said switch spring and said electrical contact, a housing having an insulating block with recesses thereon for receiving said snap switches, said insulating block being located between said pressure bellows on one hand and said snap switches and said pressure plate on the other hand, means pivotally mounting said pressure plate in said housing, a compression strut projecting between said snap switches for transmitting the superimposed regulating movement of the screw spindle and the expansion movement of the pressure bellows to said pressure plate, spring means biassing said pressure plate in the direction of the snap switches, adjusting screws operative between said pressure plate and respective ones of said snap switches so that the snap switches are kept in an ''''on'''' position until the compression strut lifts the pressure plate from the snap switches against said spring bias said snap switches being adjusted relative to one antoher to operate at different temperatures, stop means for limiting movement of the pressure plate towards the snap switches, and compensating bimetal means inserted between said pressure plate and said snap switches.
Claim 5
Dependent Claim
368 words
A regulator for an electric heating appliance, comprising a pressure bellows, a sensor element adapted to be exposed to the temperature of the electric heating appliance or of an object being heated thereby, means interconnecting said pressure bellows and said sensor element, a thermally expansible fluid in said pressure bellows, said interconnecting means and said sensor, a rotatable screw spindle, a direct coaxial connection between said screw spindle and said pressure bellows, manually operable adjusting means for rotating said screw spindle, a substantially rigid pressure plate, at least two parallel snap switches which are off in their free state and are located between said pressure bellows and said pressure plate, each snap switch underlying the pressure plate and including a switch spring with an electrical contact at one end thereof and a cooperating bowed snap spring adapted to effect movement of said switch spring and said electrical contact, a housing comprising a housing front accommodating said screw spindle and said pressure bellows, an insulating cover part covering said pressure plate, and an insulating block with recesses thereon for receiving said snap switches and electrical connections therefor, said insulating block being located between said pressure bellows on one hand and said snap switches and sAid pressure plate on the other hand, means pivotally mounting said pressure plate in said housing, a compression strut projecting between said snap switches for transmitting the superimposed regulating movement of the screw spindle and the expansion movement of the pressure bellows to said pressure plate, spring means biasing said pressure plate in the direction of the snap switches, adjusting screws operative between said pressure plate and respective ones of said snap switches so that the snap switches are kept in an ''''on'''' position until the compression strut lifts the pressure plate from the snap switches against said spring bias said snap switches being adjusted relative to one another to operate at different temperatures, a small insulating plate placed between said pressure plate and said snap switches, said compression strut and said adjusting screws passing through said insulating plate, which substantially closes said recesses in which said snap switches are located, and stop means for limiting movement of the pressure plate towards the snap switches.
Claim 6
Dependent Claim
368 words
A regulator for an electric heating appliance, comprising a pressure bellows, a sensor element adapted to be exposed to the temperature of the electric heating appliance or of an object being heated thereby, means interconnecting said pressure bellows and said sensor element, a thermally expansible fluid in said pressure bellows, said interconnecting means and said sensor, a rotatable screw spindle, a direct coaxial connection between said screw spindle and said pressure bellows, manually operable adjusting means for rotating said screw spindle, a substantially rigid pressure plate, at least two parallel snap switches which are off in their free state and are located between said pressure bellows and said pressure plate, each snap switch underlying the pressure plate and including a switch spring with an electrical contact at one end thereof and a cooperating bowed snap spring adapted to effect movement of said switch spring and said electrical contact, a housing comprising a housing front accommodating said screw spindle and said pressure bellows, an insulating cover part covering said pressure plate, and an insulating block with recesses thereon for receiving said snap switches and electrical connections therefor, said insulating block being located between said pressure bellows on one hand and said snap switches and sAid pressure plate on the other hand, means pivotally mounting said pressure plate in said housing, a compression strut projecting between said snap switches for transmitting the superimposed regulating movement of the screw spindle and the expansion movement of the pressure bellows to said pressure plate, spring means biasing said pressure plate in the direction of the snap switches, adjusting screws operative between said pressure plate and respective ones of said snap switches so that the snap switches are kept in an ''''on'''' position until the compression strut lifts the pressure plate from the snap switches against said spring bias said snap switches being adjusted relative to one another to operate at different temperatures, a small insulating plate placed between said pressure plate and said snap switches, said compression strut and said adjusting screws passing through said insulating plate, which substantially closes said recesses in which said snap switches are located, and stop means for limiting movement of the pressure plate towards the snap switches.
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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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |