GB2020908A - Snap disc operated pressure switch - Google Patents

Snap disc operated pressure switch

Info

Publication number
GB2020908A
GB2020908A GB7915973A GB7915973A GB2020908A GB 2020908 A GB2020908 A GB 2020908A GB 7915973 A GB7915973 A GB 7915973A GB 7915973 A GB7915973 A GB 7915973A GB 2020908 A GB2020908 A GB 2020908A
Authority
GB
United Kingdom
Prior art keywords
disc
switch
pressure
arm
seat
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
Application number
GB7915973A
Other versions
GB2020908B (en
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.)
Therm O Disc Inc
Original Assignee
Therm O Disc 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
Priority claimed from US06/004,743 external-priority patent/US4243858A/en
Application filed by Therm O Disc Inc filed Critical Therm O Disc Inc
Publication of GB2020908A publication Critical patent/GB2020908A/en
Application granted granted Critical
Publication of GB2020908B publication Critical patent/GB2020908B/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Abstract

A snap disc pressure switch has a thin flexible diaphragm 32 positioned adjacent to the disc 31 to isolate the pressure chamber 19 from the switch chamber 21 and to transmit the pressure forces directly to the surface of the disc 31 which is positioned in a seat 32 and is held therein by the diaphragm 32. The disc seat member 29 is shaped to support the disc 31 against overpressure and to provide a guide for the switch bumper 36. When higher operating pressures are required, two discs are positioned face-to-face in the disc seat 32 and operate at a pressure substantially equal to the sum of the calibration pressures of the discs. In another embodiment, the movable contact arm 37 of the switch is biased closed and normally held in an open position by a spring-biased plunger (86) Fig. 6 (not shown) whereby the maximum stress applied to the movable arm 37 is reduced and fatigue failures of the arm are substantially eliminated. <IMAGE>
GB7915973A 1978-05-15 1979-05-09 Snap disc operated pressure switch Expired GB2020908B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US90588778A 1978-05-15 1978-05-15
US06/004,743 US4243858A (en) 1979-01-19 1979-01-19 Snap disc operated pressure switch

Publications (2)

Publication Number Publication Date
GB2020908A true GB2020908A (en) 1979-11-21
GB2020908B GB2020908B (en) 1982-08-04

Family

ID=26673400

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7915973A Expired GB2020908B (en) 1978-05-15 1979-05-09 Snap disc operated pressure switch

Country Status (4)

Country Link
CA (1) CA1124289A (en)
DE (1) DE2919778A1 (en)
FR (1) FR2426324B1 (en)
GB (1) GB2020908B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4410776A (en) * 1981-03-16 1983-10-18 General Electric Company Control device
GB2141585A (en) * 1982-12-03 1984-12-19 John Roger Bernard Pressure switch
GB2176595A (en) * 1985-06-05 1986-12-31 Warner Lambert Co Pressure sensing device
EP0212255A2 (en) * 1985-08-16 1987-03-04 Ranco Incorporated Of Delaware Pressure control device
FR2620562A1 (en) * 1987-09-15 1989-03-17 Seim Sa Rapid-action electric contactor
EP1808877A2 (en) 2006-01-12 2007-07-18 Georg Emken Electrical microswitch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0100221A3 (en) * 1982-07-26 1984-05-23 Robertshaw Controls Company Fluid pressure sensitive construction and method of making the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1473632B1 (en) * 1964-07-03 1970-10-22 Texas Instruments Inc Monostable snap membrane switch and method for its manufacture
US3378656A (en) * 1966-01-03 1968-04-16 Texas Instruments Inc Adjustment means for electrical switch
US3553402A (en) * 1968-07-23 1971-01-05 Fasco Industries Pressure switch with improved diaphragm and snap action disc structure
US3773991A (en) * 1971-07-09 1973-11-20 Furnas Elec Co Snap action pressure responsive control device with single stroke make and break
US4121074A (en) * 1977-09-29 1978-10-17 Texas Instruments Incorporated Condition responsive apparatus with motion transfer member to movable contact arm

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4410776A (en) * 1981-03-16 1983-10-18 General Electric Company Control device
GB2141585A (en) * 1982-12-03 1984-12-19 John Roger Bernard Pressure switch
GB2176595A (en) * 1985-06-05 1986-12-31 Warner Lambert Co Pressure sensing device
EP0212255A2 (en) * 1985-08-16 1987-03-04 Ranco Incorporated Of Delaware Pressure control device
EP0212255A3 (en) * 1985-08-16 1989-06-28 Ranco Incorporated Pressure control device
FR2620562A1 (en) * 1987-09-15 1989-03-17 Seim Sa Rapid-action electric contactor
EP1808877A2 (en) 2006-01-12 2007-07-18 Georg Emken Electrical microswitch
EP1808877A3 (en) * 2006-01-12 2008-12-17 Georg Emken Electrical microswitch

Also Published As

Publication number Publication date
DE2919778A1 (en) 1979-11-22
FR2426324B1 (en) 1985-11-15
FR2426324A1 (en) 1979-12-14
GB2020908B (en) 1982-08-04
CA1124289A (en) 1982-05-25

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940509