EP1137030A1 - Electric switching unit for security means in household appliances - Google Patents
Electric switching unit for security means in household appliances Download PDFInfo
- Publication number
- EP1137030A1 EP1137030A1 EP01106430A EP01106430A EP1137030A1 EP 1137030 A1 EP1137030 A1 EP 1137030A1 EP 01106430 A EP01106430 A EP 01106430A EP 01106430 A EP01106430 A EP 01106430A EP 1137030 A1 EP1137030 A1 EP 1137030A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bimetal strip
- spring
- strip
- ptc resistor
- switching unit
- 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.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/10—Compensation for variation of ambient temperature or pressure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H61/00—Electrothermal relays
- H01H61/06—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts
Definitions
- the invention concerns an electric switching unit for a security means in household appliances, wherein a PTC resistor is inserted between a bistable switching spring, whereto a security means blocking element is attached, and a bimetal strip and wherein, at a possible elevated temperature of the appliance, the PTC resistor displacement towards the bistable switching spring as accomplished by the bimetal strip is compensated for in a more precise manner.
- the applicant manufactures a security means for use in household appliances. It is provided with a suitable electric switching unit.
- This unit comprises a PTC resistor, a bimetal strip connected to a first connecting terminal of the unit, a compensating bimetal strip and a bistable switching spring, which is connected to a second connecting terminal of the unit.
- the bistable switching spring is composed of a strip spring and a hoop spring, which at one end are rigidly joined to each other and fastened to a casing of the electric switching unit, whereas, close to the free end, they are elastically joined by a coupling spring.
- the PTC resistor is inserted between the bimetal strip and the strip spring, the position of which is decisive for the jumping over of the hoop spring from one stable position into another one, and it has an electric contact with both of them.
- a security means blocking element is inclinably mounted to the free end of the hoop spring.
- the ends of the bimetal strip are leaned against the ends of the compensating bimetal strip which compensates for the PTC resistor displacement due to the elevated appliance temperature,
- the proximity of the compensating bimetal strip to the PTC resistor and a good thermal contact therewith through both ends of the bimetal strip result in the compensating bimetal strip being too strongly influenced by the PTC resistor temperature, which overshadows the influence of the appliance temperture.
- the technical problem to be solved by the present invention is how to improve the sensing of the appliance temperature by means of a compensating bimetal strip so that by a properly placing it with respect to a bimetal strip the influence of the temperature of a PTC resistor supported by the bimetal strip is reduced.
- An electric switching unit and provided for a security means in household appliances is represented in the Figure in sectional view. It comprises a PTC resistor 1, a bimetal strip 2 connected to a first connecting terminal of the electric switching unit, a compensating bimetal strip 21 and a bistable switching spring 3, which is connected to a second connecting terminal of the electric switching unit.
- the bistable switching spring 3 is made up of a strip spring 31 and a hoop spring 32.
- the springs 31 and 32 are rigidly joined to each other at one end and fastened to a casing of the electric switching unit, whereas, close to the free end they are elastically joined by a coupling spring 33.
- the hoop spring 32 of the bistable switching spring 3 jumps over from one stable position into another one.
- the PTC resistor 1 is inserted between the bimetal strip 2, preferentially in the middle of the bimetal strip 2, and the strip spring 31, the position of which is decisive for the jumping over of the bistable switching spring 3.
- the PTC resistor 1 has an electric contact with the bimetal strip 2 and also with the hoop spring 32 through a contact 311 mounted thereon.
- a security means blocking element 4 is inclinably mounted to the free end of the hoop spring 32, which is provided with a movable contact 321 close to said free end.
- a first end of the bimetal strip 2 is leaned against an adjusting screw 22 and the second end thereof is leaned against the compensating bimetal strip 21, preferentially in the middle of the compensating bimetal strip 21, both ends of which are leaned against the casing of the electric switching unit.
- the electric current tlows through the PTC resistor 1 warming it up.
- the bimetal strip 2 which is in touch with the PTC resistor 1, gets warm too and pushes the PTC resistor 1 towards the strip spring 31.
- the strip spring 31 undergoes a certain displacement, the hoop spring 32 jumps over into another stable position and the blocking element 4 is moved in direction 41 to a blocking position.
- the compensating bimetal strip 21 compensates for the said displacement for a contribution resulting from the elevated appliance temperature. Therefore the PTC resistor 1 should only slightly influence the temperature of the compensating bimetal strip 21. Namely, the compensating bimetal strip 21 must sense the temperature of the appliance wherein the security means is placed. This is accomplished by the length of the bimetal strip 2 sufficiently exceeding the diameter of the PTC resistor 1 so that the warmed up PTC resistor 1 does not exert too Strong influence upon the compensating bimetal strip 21.
Landscapes
- Thermally Actuated Switches (AREA)
- Thermistors And Varistors (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
Description
- The invention concerns an electric switching unit for a security means in household appliances, wherein a PTC resistor is inserted between a bistable switching spring, whereto a security means blocking element is attached, and a bimetal strip and wherein, at a possible elevated temperature of the appliance, the PTC resistor displacement towards the bistable switching spring as accomplished by the bimetal strip is compensated for in a more precise manner.
- The applicant manufactures a security means for use in household appliances. It is provided with a suitable electric switching unit. This unit comprises a PTC resistor, a bimetal strip connected to a first connecting terminal of the unit, a compensating bimetal strip and a bistable switching spring, which is connected to a second connecting terminal of the unit. The bistable switching spring is composed of a strip spring and a hoop spring, which at one end are rigidly joined to each other and fastened to a casing of the electric switching unit, whereas, close to the free end, they are elastically joined by a coupling spring. The PTC resistor is inserted between the bimetal strip and the strip spring, the position of which is decisive for the jumping over of the hoop spring from one stable position into another one, and it has an electric contact with both of them. A security means blocking element is inclinably mounted to the free end of the hoop spring. The ends of the bimetal strip are leaned against the ends of the compensating bimetal strip which compensates for the PTC resistor displacement due to the elevated appliance temperature, The proximity of the compensating bimetal strip to the PTC resistor and a good thermal contact therewith through both ends of the bimetal strip result in the compensating bimetal strip being too strongly influenced by the PTC resistor temperature, which overshadows the influence of the appliance temperture.
- Consequently, the technical problem to be solved by the present invention is how to improve the sensing of the appliance temperature by means of a compensating bimetal strip so that by a properly placing it with respect to a bimetal strip the influence of the temperature of a PTC resistor supported by the bimetal strip is reduced.
- The novel features that are considered characteristic of this invention are set forth with particularity in the appended claims.
- The advantage of the electric switching unit for a security means in household appliances with respect to such known electric switching unit exists in that therein a more precise compensation for the elevated appliance temperature is accomplished, which favourably results in a shorter turning-off time of the security means and also its spread is narrower.
- The invention will now be explained in more detail by way of the description of an embodiment and with reference to the accompanying drawing representing in the sole Figure a section of a preferential embodiment of the electric switching unit for a security means in household appliances.
- An electric switching unit according to the invention and provided for a security means in household appliances is represented in the Figure in sectional view. It comprises a
PTC resistor 1, abimetal strip 2 connected to a first connecting terminal of the electric switching unit, a compensatingbimetal strip 21 and abistable switching spring 3, which is connected to a second connecting terminal of the electric switching unit. - The bistable switching
spring 3 is made up of astrip spring 31 and ahoop spring 32. Thesprings coupling spring 33. Depending on the position of thestrip spring 31, thehoop spring 32 of the bistable switchingspring 3 jumps over from one stable position into another one. - The
PTC resistor 1 is inserted between thebimetal strip 2, preferentially in the middle of thebimetal strip 2, and thestrip spring 31, the position of which is decisive for the jumping over of thebistable switching spring 3. ThePTC resistor 1 has an electric contact with thebimetal strip 2 and also with thehoop spring 32 through acontact 311 mounted thereon. - In a known way a security means blocking element 4 is inclinably mounted to the free end of the
hoop spring 32, which is provided with amovable contact 321 close to said free end. - A first end of the
bimetal strip 2 is leaned against an adjustingscrew 22 and the second end thereof is leaned against the compensatingbimetal strip 21, preferentially in the middle of the compensatingbimetal strip 21, both ends of which are leaned against the casing of the electric switching unit. - When voltage is applied to the connecting terminals of the electric switching unit according to the invention, the electric current tlows through the
PTC resistor 1 warming it up. Thebimetal strip 2, which is in touch with thePTC resistor 1, gets warm too and pushes thePTC resistor 1 towards thestrip spring 31. When thestrip spring 31 undergoes a certain displacement, thehoop spring 32 jumps over into another stable position and the blocking element 4 is moved indirection 41 to a blocking position. - The compensating
bimetal strip 21 compensates for the said displacement for a contribution resulting from the elevated appliance temperature. Therefore thePTC resistor 1 should only slightly influence the temperature of the compensatingbimetal strip 21. Namely, the compensatingbimetal strip 21 must sense the temperature of the appliance wherein the security means is placed. This is accomplished by the length of thebimetal strip 2 sufficiently exceeding the diameter of thePTC resistor 1 so that the warmed upPTC resistor 1 does not exert too Strong influence upon the compensatingbimetal strip 21.
Claims (3)
- Electric switching unit for a security means in household appliances, comprising a PTC resistor (1), a bimetal strip (2) connected to a first connecting terminal of the unit, a compensating bimetal strip (21) and a bistable switching spring (3), which is connected to a second connecting terminal of the unit and whereto a blocking element (4) is attached and between a part (31) of the bistable switching spring (3) decisive for its jumping over and the bimetal strip (2) the PTC resistor (1) is placed, which has an electric contact with said part (31) as well with the bimetal strip (2), characterized in that a first end of the bimetal strip (2) is leaned against an adjusting screw (22) and the second end thereof is leaned against the compensating bimetal strip (21).
- Electric switching unit for a security means in household appliances as recited in claim 1, characterized in that the PTC resistor (1) is placed in the middle of the bimetal strip (2)
and that the second end of the bimetal strip (2) is leaned against the middle of the compensating bimetal strip (21) which is supported at both ends. - Electric switching unit for a security means in household appliances as recited in claim 1 or 2, characterized in that the length of the bimetal strip (2) exceeds the diameter of the PTC resistor (1) to such an extent that the PTC resistor (1) only slightly influences the temperature of the compensating bimetal strip (21).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200000081 | 2000-03-23 | ||
SI200000081A SI20537A (en) | 2000-03-23 | 2000-03-23 | Electric switching assembly for security device preparation within an appliance |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1137030A1 true EP1137030A1 (en) | 2001-09-26 |
EP1137030B1 EP1137030B1 (en) | 2003-02-19 |
Family
ID=20432627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20010106430 Expired - Lifetime EP1137030B1 (en) | 2000-03-23 | 2001-03-22 | Electric switching unit for security means in household appliances |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1137030B1 (en) |
DE (1) | DE60100104T2 (en) |
ES (1) | ES2192550T3 (en) |
SI (1) | SI20537A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1550759A2 (en) * | 2003-12-18 | 2005-07-06 | ITW Metalflex d.o.o. Tolmin | Security means in a household appliance |
EP1645706A2 (en) * | 2004-10-06 | 2006-04-12 | ITW Metalflex d.o.o. Tolmin | Safety lock of a door of household appliances |
WO2006095241A1 (en) | 2005-03-08 | 2006-09-14 | Itw Metalflex, Druzba Za Proizvodnjo Delov Za Gospodinjske Aparate, D.O.O. | Blocking device for the door of an electric household appliance, in particular the door of a washing machine |
WO2008044132A3 (en) * | 2006-10-13 | 2008-08-21 | Itw Metalflex Druzba Za Proizv | Blocking device for the door of an electric household appliance, in particular the door of a washing machine |
WO2013151964A1 (en) | 2012-04-03 | 2013-10-10 | Illinois Tool Works Inc. | Door locking device with integrated door sensing switch |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110106668B (en) * | 2019-06-11 | 2021-06-15 | 温州天健电器有限公司 | Electric door lock on-off control device, door lock and washing machine |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3702454A (en) * | 1971-09-24 | 1972-11-07 | Montec Corp | Ambient compensated time delay switch |
EP0682352A2 (en) * | 1994-05-12 | 1995-11-15 | SAMUEL MONTAGU & CO. LIMITED (as Security Trustee of DIAMOND H CONTROLS LIMITED) | Energy regulator |
-
2000
- 2000-03-23 SI SI200000081A patent/SI20537A/en not_active IP Right Cessation
-
2001
- 2001-03-22 ES ES01106430T patent/ES2192550T3/en not_active Expired - Lifetime
- 2001-03-22 EP EP20010106430 patent/EP1137030B1/en not_active Expired - Lifetime
- 2001-03-22 DE DE2001600104 patent/DE60100104T2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3702454A (en) * | 1971-09-24 | 1972-11-07 | Montec Corp | Ambient compensated time delay switch |
EP0682352A2 (en) * | 1994-05-12 | 1995-11-15 | SAMUEL MONTAGU & CO. LIMITED (as Security Trustee of DIAMOND H CONTROLS LIMITED) | Energy regulator |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1550759A2 (en) * | 2003-12-18 | 2005-07-06 | ITW Metalflex d.o.o. Tolmin | Security means in a household appliance |
EP1550759A3 (en) * | 2003-12-18 | 2009-08-26 | ITW Metalflex d.o.o. Tolmin | Security means in a household appliance |
EP1645706A2 (en) * | 2004-10-06 | 2006-04-12 | ITW Metalflex d.o.o. Tolmin | Safety lock of a door of household appliances |
EP1645706A3 (en) * | 2004-10-06 | 2008-04-02 | ITW Metalflex d.o.o. Tolmin | Safety lock of a door of household appliances |
WO2006095241A1 (en) | 2005-03-08 | 2006-09-14 | Itw Metalflex, Druzba Za Proizvodnjo Delov Za Gospodinjske Aparate, D.O.O. | Blocking device for the door of an electric household appliance, in particular the door of a washing machine |
WO2008044132A3 (en) * | 2006-10-13 | 2008-08-21 | Itw Metalflex Druzba Za Proizv | Blocking device for the door of an electric household appliance, in particular the door of a washing machine |
WO2013151964A1 (en) | 2012-04-03 | 2013-10-10 | Illinois Tool Works Inc. | Door locking device with integrated door sensing switch |
Also Published As
Publication number | Publication date |
---|---|
EP1137030B1 (en) | 2003-02-19 |
DE60100104D1 (en) | 2003-03-27 |
DE60100104T2 (en) | 2004-01-29 |
SI20537A (en) | 2001-10-31 |
ES2192550T3 (en) | 2003-10-16 |
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