GB1342833A - Electrically heated toaster - Google Patents
Electrically heated toasterInfo
- Publication number
- GB1342833A GB1342833A GB2174371A GB2174371A GB1342833A GB 1342833 A GB1342833 A GB 1342833A GB 2174371 A GB2174371 A GB 2174371A GB 2174371 A GB2174371 A GB 2174371A GB 1342833 A GB1342833 A GB 1342833A
- Authority
- GB
- United Kingdom
- Prior art keywords
- toasting
- toaster
- threshold potential
- chamber
- time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
- H03K17/292—Modifications for introducing a time delay before switching in thyristor, unijunction transistor or programmable unijunction transistor switches
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J37/00—Baking; Roasting; Grilling; Frying
- A47J37/06—Roasters; Grills; Sandwich grills
- A47J37/08—Bread-toasters
- A47J37/0814—Bread-toasters with automatic bread ejection or timing means
- A47J37/085—Bread-toasters with automatic bread ejection or timing means with means for sensing the bread condition
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Food Science & Technology (AREA)
- Electric Stoves And Ranges (AREA)
Abstract
1342833 Toasters ROWENTA-WERKE GmbH 19 April 1971 [13 Feb 1970 13 Aug 1970] 21743/71 Heading A4D [Also in Divisions G1 and H3] A timing device for an electrically heated toaster uses an RC circuit to control the toasting time. The direct voltage supply for the control circuit is tapped from the heating element, through rectifier GL and capacitor C 1 . The time taken for capacitor C 2 to reach the threshold potential of PUT, a programmable unijunction transistor, is controlled by resistors R 8 , R 7 and R 1 . The resistance of R 8 is variable by means of a control knob on the outside of the toaster to vary the toasting time. The threshold potential at PUT is controlled by resistors R 5 and R 6 and the temperature sensing resistor NTC (21). This resistor which has a negative temperature coefficient of resistance is placed in an aperture in the wall of the toasting chamber. Thus if the chamber is hot the threshold potential of PUT is lowered resulting in a shorter toasting time. When the threshold potential of PUT is reached PUT is turned on and the resulting voltage drop at R 2 turns on the thyristor which activates the electromagnet Sp (15) and releases the lock on the bread carrier. The residual charge in C 2 is discharged through R 9 and D 2 . In a modification the thyristor is activated by an integrated circuit which responds to the potential of C 2 . The circuits may be housed in ventilated chambers at the end or on the base of the toaster and may have thermal insulation between them and the toasting chamber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19707005058 DE7005058U (en) | 1970-02-13 | 1970-02-13 | ELECTRIC BREAD ROESTER. |
| DE19702040177 DE2040177B2 (en) | 1970-08-13 | 1970-08-13 | ELECTRICALLY HEATED BREAD ROESTER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1342833A true GB1342833A (en) | 1974-01-03 |
Family
ID=25759578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2174371A Expired GB1342833A (en) | 1970-02-13 | 1971-04-19 | Electrically heated toaster |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB1342833A (en) |
| NL (1) | NL7101519A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2220311A (en) * | 1988-06-15 | 1990-01-04 | Swan Housewares Ltd | Electric toaster with electronic timer |
-
1971
- 1971-02-04 NL NL7101519A patent/NL7101519A/xx unknown
- 1971-04-19 GB GB2174371A patent/GB1342833A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2220311A (en) * | 1988-06-15 | 1990-01-04 | Swan Housewares Ltd | Electric toaster with electronic timer |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7101519A (en) | 1971-08-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |