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GB1524686A - Temperature responsive swotching device - Google Patents

Temperature responsive swotching device

Info

Publication number
GB1524686A
GB1524686A GB39255/75A GB3925575A GB1524686A GB 1524686 A GB1524686 A GB 1524686A GB 39255/75 A GB39255/75 A GB 39255/75A GB 3925575 A GB3925575 A GB 3925575A GB 1524686 A GB1524686 A GB 1524686A
Authority
GB
United Kingdom
Prior art keywords
blade
diaphragm
switch
lever
temperature
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
Application number
GB39255/75A
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.)
Robertshaw US Holding Corp
Original Assignee
Ranco Inc
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 Ranco Inc filed Critical Ranco Inc
Publication of GB1524686A publication Critical patent/GB1524686A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
    • H01H35/343—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm by snap acting diaphragm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/70—Resetting means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/70—Resetting means
    • H01H2037/705—Resetting means wherein the switch cannot be closed when the temperature is above a certain value

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermally Actuated Switches (AREA)
  • Control Of Temperature (AREA)

Abstract

1524686 Thermal switches RANCO Inc 25 Sept 1975 [30 Sept 1974] 39255/75 Heading H1N A thermal switch comprises a movable contact 82 supported on a resilient blade 84 for movement relative to a fixed contact 80 and a thermally responsive snap acting diaphragm 92 for moving the blade 84 via a lever 110 which has a part cylindrical bearing surface 140 engaging a corresponding surface formed in the wall of the switch housing. In one embodiment, the fixed contact 80 is connected to a U-shaped member 30 having one of its legs extending from the housing 26 of the switch to define one terminal 78 and the resilient blade 84 is riveted to a similar U-shaped member 28 defining another terminal. The diaphragm 92 comprises a snap acting disc forming part of a fluid chamber 88 connected to a capillary tube 94 which leads to the appliance whose temperature is to be sensed. Above a predetermined temperature, the diaphragm 92 moves with a snap action to pivot the lever 110 about a hinge axis 148 which in turn deflects the blade 84 away from the fixed contact 80. The blade 84 can only be moved back into the closed switch position by a reset pin 160 which acts on the blade 84 via a leaf spring 162 riveted to the terminal 28. The diaphragm 92 is snapped back to its initial position by the lever 110 when the blade 84 is moved by the reset pin 160 to the closed position which can only occur if the temperature of the appliance is below the predetermined level. The portion 122 of the lever 110 which engages the blade 84 wears away by sliding along the blade 84 during opening and closing of the contacts 80, 82 so as to compensate for the normal erosion of the contacts 80, 82 thereby preventing a change in operating temperature of the switch. In another embodiment (Fig. 9, not shown) the reset pin 160 is omitted and the diaphragm 92 snaps back to its initial position when the temperature falls below the predetermined level.
GB39255/75A 1974-09-30 1975-09-25 Temperature responsive swotching device Expired GB1524686A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US510700A US3924213A (en) 1974-09-30 1974-09-30 Thermostat

Publications (1)

Publication Number Publication Date
GB1524686A true GB1524686A (en) 1978-09-13

Family

ID=24031813

Family Applications (2)

Application Number Title Priority Date Filing Date
GB310/78A Expired GB1524687A (en) 1974-09-30 1975-09-25 Resettable thermally responsive switching device
GB39255/75A Expired GB1524686A (en) 1974-09-30 1975-09-25 Temperature responsive swotching device

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB310/78A Expired GB1524687A (en) 1974-09-30 1975-09-25 Resettable thermally responsive switching device

Country Status (7)

Country Link
US (1) US3924213A (en)
JP (1) JPS5922332B2 (en)
CA (1) CA1044289A (en)
DE (1) DE2538332C2 (en)
FR (1) FR2286431A1 (en)
GB (2) GB1524687A (en)
SE (2) SE410662B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8413912D0 (en) * 1984-05-31 1984-07-04 Elmwood Sensors Electrical switches
JPS6218940U (en) * 1985-07-18 1987-02-04
GB2185629B (en) * 1986-01-17 1989-01-25 Ranco Controls Ltd Trip-free resetting machanism for an on-off unit
US4937549A (en) * 1989-10-02 1990-06-26 General Electric Company Condition responsive switching apparatus
US5101188A (en) * 1989-10-02 1992-03-31 General Electric Company Condition responsive switching apparatus
US5790009A (en) * 1997-01-21 1998-08-04 Black & Decker Inc. Thermostat reset with additional electrical switch
US5929742A (en) * 1997-03-27 1999-07-27 Elmwood Sensors, Inc. Trip-free, manual reset thermostat
US5854585A (en) * 1997-04-10 1998-12-29 Texas Instruments Incorporated Manual reset electrical equipment protector apparatus
US5861794A (en) * 1998-05-04 1999-01-19 Texas Instruments Incorporated Thermal circuit breaker apparatus
US5950811A (en) * 1998-06-18 1999-09-14 Johnson Controls Technology Co. Electrical switch with user selectable manual/automatic reset
US20050231318A1 (en) * 2004-04-15 2005-10-20 James Bullington Trip-free limit switch and reset mechanism
JP4339750B2 (en) * 2004-06-10 2009-10-07 ワコー電子株式会社 Manual reset thermostat
US7405645B2 (en) * 2006-04-20 2008-07-29 Sensata Technologies, Inc. Thermally activated circuit interrupter
GB2520572A (en) * 2013-11-26 2015-05-27 Johnson Electric Sa Electrical Contactor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668889A (en) * 1950-12-30 1954-02-09 Paul Henry Snap-action thermostatic switch
US3018345A (en) * 1960-12-15 1962-01-23 Honeywell Regulator Co Switch apparatus
US3405380A (en) * 1965-12-06 1968-10-08 Mc Graw Edison Co Thermal relay having separate heater means to open or close the relay
US3573700A (en) * 1968-11-29 1971-04-06 Therm O Disc Inc Adjustable thermostat
DE2111968B2 (en) * 1970-03-13 1973-12-06 Elve Elettrotecnica S.P.A., Borgo S. Giovanni, Mailand (Italien) Quickly triggering bimetal thermostat
DE2130004A1 (en) * 1970-06-19 1971-12-30 Electrovac Thermal switch with a small switching temperature difference

Also Published As

Publication number Publication date
GB1524687A (en) 1978-09-13
SE7508969L (en) 1976-03-31
SE410662B (en) 1979-10-22
US3924213A (en) 1975-12-02
JPS5922332B2 (en) 1984-05-25
DE2538332C2 (en) 1986-02-06
FR2286431B1 (en) 1981-10-23
FR2286431A1 (en) 1976-04-23
CA1044289A (en) 1978-12-12
SE436954B (en) 1985-01-28
JPS5162366A (en) 1976-05-29
SE7813464L (en) 1978-12-29
DE2538332A1 (en) 1976-04-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee