GB2172749A - Thermostat - Google Patents
Thermostat Download PDFInfo
- Publication number
- GB2172749A GB2172749A GB08606491A GB8606491A GB2172749A GB 2172749 A GB2172749 A GB 2172749A GB 08606491 A GB08606491 A GB 08606491A GB 8606491 A GB8606491 A GB 8606491A GB 2172749 A GB2172749 A GB 2172749A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dish
- thermostat
- base
- tabs
- tab
- 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
Links
- 230000002441 reversible effect Effects 0.000 claims abstract description 4
- 238000007654 immersion Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 abstract description 4
- 239000004033 plastic Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/002—Thermally-actuated switches combined with protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
- H01H37/48—Thermally-sensitive members actuated due to expansion or contraction of a solid with extensible rigid rods or tubes
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Resistance Heating (AREA)
- Thermally Actuated Switches (AREA)
Abstract
In order to be able to fix a rod and tube actuator 2 of a thermostat to a plastics base 1 and in order to be able to provide a safety device for cutting off the supply of heat if the temperature rises too high, the tube 3 is fastened in a bore 6a of a boss 6 of a heat conductive dish 5 by force fitting a sleeve 7 in the end of the tube 3. The dish 5 comprises two vertical tabs 10,9 which engage in slots 11,12 in the base 1, parts of the tabs 10,9 being folded down against shoulders in the slots 11,12 to secure the dish 5 to the base 1. A reversible concave washer 14 is disposed in the dish 5 and cooperates with a slide block 15 capable of cutting off the supply current when too high a temperature is communicated to this washer 14. <IMAGE>
Description
SPECIFICATION
Immersion tube thermostat
The present invention relates to improvements in or relating to thermostats incorporating an immersion tube.
Thermostats of the type in question comprise a base which is more and more frequently made of an appropriate plastics material such as a polyester compound. It is therefore necessary to provide a particular mode of fixing the immersion tube with respect to this base to take into account the particular qualities of strength of this plastics material. Moreover, it will be readily appreciated that a thermostat must comprise a safety device adapted to cut off supply of heating to the enclosure in which its immersion tube is disposed, in the event of untimely rise in the temperature of this enclosure.
It is an object of the improvements according to the present invention to produce a particularly appropriate connection of the cylindrical casing of the immersion tube, said connection being associated with means for actuating cut-off switches ensuring operational safety.
To this end, the end of the metallic cylindrical casing of the immersion tube is connected to the base of the thermostat by a good heatconducting dish of which the centre is provided with a boss in the bore of which said end is fastened, said dish abutting against one of the faces of the base, whilst it is provided with two tabs which pass therethrough and are adapted to be folded down at least partially against its opposite face.
The dish comprises a peripheral flange against which rests a reversible concave washer which is deformed under the action of a determined temperature of said dish with a view to actuating a slide block of which the displacement provokes cut-off of the heating circuit of the enclosure in which the immersion tube of the thermostat is disposed.
The invention will be more readily understood on reading the following description with reference to the accompanying drawings, in which:
Figure 1 is a transverse section through an immersion tube thermostat comprising the improvements according to the invention.
Figure 2 is a view in perspective with parts torn away of part of the base of the thermostat according to the invention.
Figure 3 is a view in perspective of the dish to which the end of the cylindrical casing of the immersion tube is fastened.
Figure 4 is a view similar to that of Fig. 2, but in which the dish of Fig. 3 has been shown after assembly with the base.
Referring now to the drawings, the thermostat illustrated in Fig. 1 essentially comprises a base 1 made of a plastics material such as a polyester compound, and which supports, on the one hand, the mechanism controlling the supply circuit of a heating system and, on the other hand, an immersion tube 2. The latter is composed of a metallic cylindrical casing 3 enclosing a rod 4 made of a non-dilatable material such as a ferronickel with 36% of nickel.
The free ends of the cylindrical casing and of the rod are associated in conventional manner by hammering or welding.
In accordance with the invention, the opposite end of the metal casing 3 is fastened to a metal dish 5 illustrated in Fig. 3. Said dish comprises a central boss 6 in the bore 6a of which the tube is engaged with snug sliding fit, whilst a tubular sleeve 7 is engaged by force in the end in question of the casing 3 so that said end is sandwiched between the outside of this sleeve and the bore 6a. An excellent assembly of the casing and of the dish 5 is thus effected.
The presence is observed of two diametrically opposite tabs upstanding perpendicularly to the peripheral flange 8 of the dish 5. Tab referenced 9 comprises a base 9a and a head 9b in the form of a perforated diamond in its centre. The other tab 10 comprises a vertical extension 10a of which the base is adjacent two wings 10b, 10c oriented in the same direction as the extension 10a and separated therefrom by two notches 10d, 10e.
In base 1 are made a slot 11 (Fig. 2) through which tab 10 passes and a passage 12 in which tab 9 engages.
Passage 12 comprises a horizontal shoulder 1 2a against which head 9b of tab 9 is flattened as illustrated in Fig. 4 so as to retain dish 5 axially with respect to the base 1.
Similarly, slot 11 is provided with a shoulder determining two faces 11 a and 11 b oriented horizontally and against which the two wings 10b and 10c of tab 10 are folded down in order to constitute a second fixation of dish 5 with respect to base 1. It is observed in Fig. 1 that extension 10a of tab 10 passes beyond the base 1 in order to serve as articulation for one of the ends of a pivoting blade 13 actuated by the rod 4 during variations in temperature prevailing within the enclosure in which the immersion tube 2 is disposed.
According to another feature of the invention, a reversible concave washer 14 is disposed inside the dish 5, its periphery resting on the flange 8 thereof. Above the washer is a slide block 15 traversed by rod 4 and which may move vertically in reciprocal motion in an appropriate opening 16 made transversely in the base 1. The washer is, of course, pierced so that the rod 4 can also traverse it. If the temperature of the metal casing 3 rises above a determined threshold, the temperature of dish 5 is established at a very similar temperature. The heat stored by the dish is transmitted to washer 14 whose structure is such that a rise in temperature causes it to blister, i.e. change it curvature, with the result that, being upwardly concave in the normal state, it becomes downwardly concave (as illustrated in discontinuous lines in Fig. 1) when its temperature exceeds a certain limit. Upward deformation of washer 14 brings about a displacement in the same direction of slide block 15. Its upper face which lies inside the casing 17 of the thermostat rises and opens the circuit for supplying and/or controlling heating of the enclosure in which the immersion tube 2 is disposed.
It must, moreover, be understood that the foregoing description has been given only by way of example and that it in no way limits the domain of the invention which would not be exceeded by replacing the details of execution described by any other equivalents.
Claims (7)
1. A thermostat incorporating an immersion tube, wherein the end of the metallic cylindrical casing of this tube is connected to the base of this thermostat by a good heatconducting dish of which the centre is provided with a boss in the bore of which said end is fastened, said dish abutting against one of the faces of the base, and it is provided with two tabs which pass therethrough and are adapted to be folded down at least partially against its opposite face.
2. A thermostat as claimed in Claim 1, wherein one of the tabs of the dish constitutes an articulation for the pivoting blade of the mechanism of the thermostat.
3. A thermostat as claimed in Claim 1, wherein the end of the cylindrical casing connected to the base is sandwiched between the bore of the boss of the dish and a metal inner sleeve.
4. A thermostat as claimed in Claim 1, wherein one of the tabs of the dish takes the form of a perforated polygon and this tab is engaged in a passage in the base in order to be flattened against a shoulder of this passage.
5. A thermostat as claimed in Claim 2, wherein one tab of the dish comprises two wings which are folded down against the bottom of the lateral extensions of a slot in the base which said tab traverses, and it constitutes an articulation for the blade.
6. A thermostat as claimed in any one of the preceding Claims, wherein a reversible concave washer rests against a peripheral flange of the dish so that it deforms under the action of a rise in temperature above a determined threshold of said dish with a view to actuating a slide block whose displacement provokes cut-off of the heating circuit of the enclosure in which the immersion tube is disposed.
7. A thermostat, substantially as herein described with reference to, and as shown in, the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8504160A FR2579013B1 (en) | 1985-03-18 | 1985-03-18 | IMPROVEMENTS ON PLUNGER TUBE THERMOSTATS |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8606491D0 GB8606491D0 (en) | 1986-04-23 |
GB2172749A true GB2172749A (en) | 1986-09-24 |
GB2172749B GB2172749B (en) | 1989-06-21 |
Family
ID=9317406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8606491A Expired GB2172749B (en) | 1985-03-18 | 1986-03-17 | Immersion thermostat |
Country Status (3)
Country | Link |
---|---|
FR (1) | FR2579013B1 (en) |
GB (1) | GB2172749B (en) |
IT (1) | IT1236574B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2611868A1 (en) * | 1987-02-24 | 1988-09-09 | Cotherm Sa | DEVICE FOR HEATING AND CONTROLLING A SPEAKER |
DE3913288A1 (en) * | 1989-04-22 | 1990-10-25 | Ego Elektro Blanc & Fischer | Temp.-responsive switching unit - has contact switching elements operated by pin adjustable to set operating point |
EP0416335A1 (en) * | 1989-09-08 | 1991-03-13 | E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG | Temperature switch |
EP0651412A1 (en) * | 1993-10-29 | 1995-05-03 | MERLONI TERMOSANITARI S.p.A. | Safety device, particularly for a thermostat with an immersion rod sensor |
EP0743666A1 (en) * | 1995-05-19 | 1996-11-20 | Cotherm | Control thermostat comprising probe with security means |
FR2735278A1 (en) * | 1995-06-12 | 1996-12-13 | Cotherm Sa | THERMOSTAT WITH PROBE COMPRISING IN THE BASE A SHAPE MEMORY ALLOY SPRING |
FR2747459A1 (en) * | 1996-04-11 | 1997-10-17 | Cotherm Sa | Electric water heater |
IT202200014128A1 (en) | 2022-07-04 | 2024-01-04 | Termoregolatori Campini Corel S P A | Rod thermostat with safety |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201518418D0 (en) * | 2015-10-19 | 2015-12-02 | Shel Nibe Mfg Co Ltd | Thermostat with independent over-temperature actuation |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH335739A (en) * | 1955-11-15 | 1959-01-31 | Sauter Ag | Temperature switch with excess temperature protection |
-
1985
- 1985-03-18 FR FR8504160A patent/FR2579013B1/en not_active Expired
-
1986
- 1986-03-14 IT IT8647771A patent/IT1236574B/en active
- 1986-03-17 GB GB8606491A patent/GB2172749B/en not_active Expired
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2611868A1 (en) * | 1987-02-24 | 1988-09-09 | Cotherm Sa | DEVICE FOR HEATING AND CONTROLLING A SPEAKER |
DE3913288A1 (en) * | 1989-04-22 | 1990-10-25 | Ego Elektro Blanc & Fischer | Temp.-responsive switching unit - has contact switching elements operated by pin adjustable to set operating point |
EP0416335A1 (en) * | 1989-09-08 | 1991-03-13 | E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG | Temperature switch |
US5113170A (en) * | 1989-09-08 | 1992-05-12 | E.G.O. Elektro-Gerate Blanc U. Fischer | Temperature switch |
EP0651412A1 (en) * | 1993-10-29 | 1995-05-03 | MERLONI TERMOSANITARI S.p.A. | Safety device, particularly for a thermostat with an immersion rod sensor |
EP0743666A1 (en) * | 1995-05-19 | 1996-11-20 | Cotherm | Control thermostat comprising probe with security means |
FR2734400A1 (en) * | 1995-05-19 | 1996-11-22 | Cotherm Sa | REGULATION THERMOSTAT COMPRISING A SAFETY DEVICE IN THE PROBE |
FR2735278A1 (en) * | 1995-06-12 | 1996-12-13 | Cotherm Sa | THERMOSTAT WITH PROBE COMPRISING IN THE BASE A SHAPE MEMORY ALLOY SPRING |
EP0749141A1 (en) * | 1995-06-12 | 1996-12-18 | Cotherm | Thermostat with probe having a SMA spring in its socket |
FR2747459A1 (en) * | 1996-04-11 | 1997-10-17 | Cotherm Sa | Electric water heater |
IT202200014128A1 (en) | 2022-07-04 | 2024-01-04 | Termoregolatori Campini Corel S P A | Rod thermostat with safety |
EP4303903A1 (en) | 2022-07-04 | 2024-01-10 | Termoregolatori Campini Corel S.p.A. | Rod thermostat with safety |
Also Published As
Publication number | Publication date |
---|---|
IT8647771A0 (en) | 1986-03-14 |
FR2579013A1 (en) | 1986-09-19 |
FR2579013B1 (en) | 1987-04-10 |
GB8606491D0 (en) | 1986-04-23 |
IT1236574B (en) | 1993-03-16 |
GB2172749B (en) | 1989-06-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PE20 | Patent expired after termination of 20 years |
Effective date: 20060316 |