EP0908913A2 - Thermostat zur Einstellung der Temperatur in elektrische Geräte - Google Patents

Thermostat zur Einstellung der Temperatur in elektrische Geräte Download PDF

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Publication number
EP0908913A2
EP0908913A2 EP98830249A EP98830249A EP0908913A2 EP 0908913 A2 EP0908913 A2 EP 0908913A2 EP 98830249 A EP98830249 A EP 98830249A EP 98830249 A EP98830249 A EP 98830249A EP 0908913 A2 EP0908913 A2 EP 0908913A2
Authority
EP
European Patent Office
Prior art keywords
temperature
thermostat
adjusting
electric appliances
blade
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.)
Withdrawn
Application number
EP98830249A
Other languages
English (en)
French (fr)
Other versions
EP0908913A3 (de
Inventor
Antonio Pollina
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PRODIGY ITALIANA Srl
Original Assignee
PRODIGY ITALIANA Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PRODIGY ITALIANA Srl filed Critical PRODIGY ITALIANA Srl
Publication of EP0908913A2 publication Critical patent/EP0908913A2/de
Publication of EP0908913A3 publication Critical patent/EP0908913A3/de
Withdrawn legal-status Critical Current

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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
    • H01H37/32—Thermally-sensitive members
    • H01H37/36—Thermally-sensitive members actuated due to expansion or contraction of a fluid with or without vaporisation

Definitions

  • the present invention relates to a thermostat for adjusting the temperature in electric appliances.
  • Temperature adjusting thermostats for adjusting the temperature in apparatus in general and, in particular, in electric appliances, and using a temperature probe, are already known.
  • the temperature measuring probe holds herein a liquid the volume of which changes depending on the temperature being sensed.
  • a capillary element is in turn coupled to a membrane generally arranged inside the thermostat and operating, through suitable volume variation transmitting means, the electric contacts of the thermostat.
  • the aim of the present invention is to provide a thermostat for adjusting the temperature in electric appliances or apparatus, which has a very small size and, moreover, is very reliable.
  • a main object of the present invention is to provide such a thermostat affording a very good insulation between the mechanical and electrical parts of the electric appliance or apparatus.
  • a further specific object of the invention is to provide such a thermostat which can be accurately and easily adjusted to the operation temperature of said appliances.
  • Yet another object of the present invention is to provide such a thermostat including small cost components.
  • a thermostat for controlling the temperature in electric appliances of the type comprising a temperature probe holding herein a liquid the volume of which changes depending on the temperature, as well as a capillary element transmitting the volume variation to a membrane, held inside a box-like body, characterized in that said membrane is provided with transmitting means for transmitting the volume variation of said membrane so as to drive a metal blade from a first position in which said blade provides an electric connection between an input terminal and a first output terminal, to a second position in which said blade is not electrically connected to said first output terminal.
  • the present invention provides a thermostat element which can be used either as a simple switch thermostat, for switching on and off an electric appliance as the temperature thereof exceeds a set threshold, or as a switching element adapted to operate an alternative device.
  • the thermostat according to the invention which has been generally indicated by the reference number 1, is of a type comprising a temperature probe (not shown) holding herein a liquid adapted to change its volume depending on the temperature, and a capillary element 3 transmitting said volume variation to a membrane 6.
  • the membrane 6, in particular, is held inside a box-like body, comprising a metal base 20 and a cover element 19, made of a plastic material.
  • the metal base 20 and plastic cover element 19 are connected to one another by a fixed-joint type of connection, and to the base 20 a supporting element 27 made of a non conductive material is applied, on said supporting element being arranged the electric terminals of the thermostat, said electric terminals comprising the input terminal 9 and the output terminals 7 and 8.
  • Such arrangement of said base 20, cover element 19 and supporting element 27 provides a box-like body, holding therein the operating or driving elements of the thermostat 1, which will be disclosed in a more detailed manner hereinafter, from which box-like body the end portions of the terminals 7, 8 and 9 and said capillary element 3 included in said temperature measurement probe project.
  • the base 20 comprises two flat elements, connected to provide a L-shape, and the shorter element of said base 20 includes therein latching seats 55 for engaging therein a blade 24, in turn L-bent, which is extended by a metal lever 5 having a substantially trapezoidal configuration and overlaying in a parallel relationship the longer side of the base 20.
  • a non conductive material pad 28 is applied, said pad facing the long side of the base 20.
  • the pad 28 is adapted to drive a metal blade 30, providing an electric connection to the input terminal 9 and, alternately, in the case in which the thermostat is used as a switching element, to one of the output terminals 7 and 8.
  • the blade 30 will provide or interrupt the electric connection between the inlet terminal 9 and an output terminal.
  • first and second output terminals 7 and 8 are provided with overlapping terminal portions defining a space in which a corresponding contact portion of the metal blade 30 is engaged.
  • the blade 30 comprises a double contact 33 which will alternately engage with contact elements 36 and 37 respectively provided on the first and second output terminals.
  • the blade or reed 30 is preferably contoured to present a ridge 38 thereagainst said non conductive material pad 28 abuts; moreover, the convexity of said ridge 38 is turned toward said pad 28.
  • the thermostat 1 operates as follows.
  • the pad 28 will press on the blade or reed 30 to provide an electric connection with the first output terminal 7.
  • the liquid held in said temperature probe, coupled to the membrane 6 through the capillary element 3, will cause the membrane 6 volume to expand or increase.
  • the membrane 6, by expanding, will drive the metal lever 5 to which it is connected thereby, as the temperature increases, the pressure exerted by the pad 28 on the ridge 38 of the metal blade 30 will be progressively released.
  • the pressure provided by the pad 28 will decrease to cause the metal blade or reed 30 to abruptely switch from a first position in which it is electrically connected to the first output terminal 7, to a second position in which the mentioned connection is interrupted.
  • thermostat 1 designed to operate as a simple switch thermostat.
  • the blade or reed 30, in said second position thereof, will provide an electric connection with the second output terminal 8, coupled to an alternative device.
  • the metal blade 30 is provided, at a middle portion thereof, with a curved portion 35 having one end coupled to the input terminal 9, thereby facilitating a resilient recovering of the blade 30 from the first position to the second position thereof.
  • the blade 30 will be subjected to a snap type of displacement between the two mentioned positions, so as to prevent sparks or electric arches from forming during the status switching of the thermostat 1.
  • the thermostat according to the invention comprises moreover a driving shaft or spindle 4, on which is pivoted said membrane 6, and by means of which it will be possible to manually adjust the spacing of the membrane 6 from the long side of the base 20.
  • the thermostat can be accurately calibrated on the desired operation temperature.
  • the driving spindle 4 will rotatively drive a wheel element 45 provided with a projecting lug which, at an end of stroke position, will abut against a pin 46 rigid with the base 20 of the box-like body.
  • a resilient fork element 23 is engaged, said fork element having end portions engaged in the seats or recesses 55, so as to properly hold the wheel element 45 in its desired position.
  • the disclosed thermostat owing to its small size and simple construction, can be made with a very high constructional accuracy, thereby providing a highly reliable thermostat.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Control Of Temperature (AREA)
EP98830249A 1997-10-09 1998-04-27 Thermostat zur Einstellung der Temperatur in elektrische Geräte Withdrawn EP0908913A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI970720U 1997-10-09
ITMI970720 IT237960Y1 (it) 1997-10-09 1997-10-09 Termostato per la regolazione della temperatura in apparecchiatureelettriche

Publications (2)

Publication Number Publication Date
EP0908913A2 true EP0908913A2 (de) 1999-04-14
EP0908913A3 EP0908913A3 (de) 2000-03-15

Family

ID=11376660

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98830249A Withdrawn EP0908913A3 (de) 1997-10-09 1998-04-27 Thermostat zur Einstellung der Temperatur in elektrische Geräte

Country Status (2)

Country Link
EP (1) EP0908913A3 (de)
IT (1) IT237960Y1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1288506A (fr) * 1960-05-02 1962-03-24 British Thermostat Co Ltd Commutateur électrique actionné thermiquement
FR1532638A (fr) * 1967-06-02 1968-07-12 Sopac Regulation Soc Ind Thermostat électrique de régulation à dilatation de liquide comportant un ou plusieurs étages de régulation
DE7639275U1 (de) * 1976-12-15 1977-03-24 Emerson Electric Gmbh, 7050 Waiblingen Thermostatischer Regler, insbesondere für Heizkessel
DE2724527A1 (de) * 1977-05-31 1978-12-14 Emerson Electric Gmbh Temperaturregler

Also Published As

Publication number Publication date
IT237960Y1 (it) 2000-09-29
ITMI970720U1 (it) 1999-04-09
EP0908913A3 (de) 2000-03-15

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