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US2624819A - Snap action switch - Google Patents

Snap action switch Download PDF

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Publication number
US2624819A
US2624819A US205282A US20528251A US2624819A US 2624819 A US2624819 A US 2624819A US 205282 A US205282 A US 205282A US 20528251 A US20528251 A US 20528251A US 2624819 A US2624819 A US 2624819A
Authority
US
United States
Prior art keywords
blade
arm
central arm
side arms
relation
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 - Lifetime
Application number
US205282A
Other languages
English (en)
Inventor
James A Spina
Edward O Andersen
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.)
General Electric Co
Original Assignee
General Electric Co
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 to BE508318D priority Critical patent/BE508318A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US205282A priority patent/US2624819A/en
Priority to FR1051560D priority patent/FR1051560A/fr
Application granted granted Critical
Publication of US2624819A publication Critical patent/US2624819A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
    • H01H5/04—Energy stored by deformation of elastic members
    • H01H5/18—Energy stored by deformation of elastic members by flexing of blade springs
    • 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
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H01H2037/5472—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting having an omega form, e.g. the bimetallic snap element having a ring shape with a central tongue
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18888—Reciprocating to or from oscillating
    • Y10T74/18896—Snap action
    • Y10T74/18904—Plate spring

Definitions

  • Our invention relates to snap action devices
  • Internally stressed snap-acting devices of the dished type may be made of homogeneous spring metal and actuated by external force, or may be formed of bimetal and actuated by thermal self-deformation.
  • snap acting thermostatic devices of the dished composite metal over-center acting type have been particularly diflieult to manufacture, and those types which most readily adapt themselves to the manufacturing process have not been of a form which facilitates the inclusion of adjustable means for controlling the critical temperature.
  • a still further object of our invention is the form we provide a substantially U-shaped split ring, or blade, of spring material curved flatwise and having opposite its juxtaposed ends a substantially U-shaped re-entrant arm which carries at its inner end a movable contact.
  • the blade is mounted at its juxtaposed ends in a mounting bracket which hold the juxtaposed ends in cambered relation and deforms the blade into a dished formation, so that the central arm is angularly displaced outwardly on the convex side of the blade.
  • the blade is formed of bimetal it is so deformed that the high expansion metal is on the normally concave side of the dish.
  • the blade In order to ensure a no zero snapping action the blade is formed with weakened portions of reduced transverse cross section at the points of connection between the side arms and the re-entrant central arm.
  • the internal stress in the plate resulting from both the camber and the abnormal spacing of its juxtaposed ends is concentrated in these relatively weak sections, so that the ring has a greater transverse curvature at these points than at any other point.
  • the side arms of the ring having a relatively slight transverse curvature, first reverse their curvature, and this overcenter snapping action irreversibly induces a similar over-center snapping action at the weakened sections.
  • the blade maintains a positive pressure until a part of the blade has snapped over-center and irreversibly initiated a complete operation.
  • FIG. 1 is a side elevational view of a snap acting electric switch embodying my invention
  • Fig. 2 is a transverse cross-sectional view of the same switch taken along the line 2-2 of Fig. 1
  • Fig. 3 is a fragmentary cross-sectional view taken along the line 3-3 of Fig. 1
  • Figs. 4 and 5 are cross-sectional views of the switch blade taken along the lines AA and BB respectively of Fig. 2
  • Fig. 6 is a side elevational view of a snap action thermostatic switch embodying our in- Referring now to the drawing, and more particularly to Figs. 1 to 5 inclusive, we have shown a manually operable snap acting electric switch comprising a base I having mounted thereon a stationary contact 2 and a snap acting switch blade 3 carrying a movable contact I.
  • the drawing and more particularly to Figs. 1 to 5 inclusive, we have shown a manually operable snap acting electric switch comprising a base I having mounted thereon a stationary contact 2 and a snap acting switch blade
  • switch blade 3 as more clearly shown .at-Fig.- -2,:-. is formed from a normally flat sheet of resilient metal and shaped as a split ringhaving a :substantially U-shaped re-entrant' contact carrying arm to disposed opposite the juxtaposed ends of the ring and between the side arms thereof.
  • the blade 3 has weakened .portions .of reduced; transverse section at each side of the,..central.. arm 3a where this arm. .joins the side arms of the blade, as at the sections BB, Fig. 2.
  • the blade, or plate, 3 is mounted upon the base! in cantilever fashion by a bracket 5 which engages the juxtaposed ends of the side arms.
  • A- manually operable push rod 6 is mounted upon the base i and arranged to engage the side arms of the blade 3 to actuate the switch.'- Itwill be understood that this push rod may: be: operated by any suitable slow-acting temperature responsive device.
  • the outwardly extending ears 5a and 5b are slightly cambered with respect to each other and about the axis of symmetrybf the blade 3 (i. e. thelongitudinal axis-of the inwardly extending arm 30.).
  • the juxtaposed ends of the side arms of the blade 3 are'fastened to the oppositely outwardly-extending.ears:5a and 5b of the mountingbracket 5, asbywelding, and are thus held in camberedrelation; This is clearly illustrated at- Figs. 1 and ..3..
  • the mounting bracket 5 is shownfixed to. theplate I by means of a bolt 8 through the bightportion of the bracket.
  • the.-.bolt-...'I is either drawn up or backed off;.:thereby to hold the juxtaposed ends of the switch plate in an abnormal spaced apart relation andfurther to internally stress the blade.
  • Such'addi-L tional internal stress is concentrated primarily in the weak portions of reduced cross section at the top of the plate.
  • the snapping action of the plate is rendered adjustable by adjustment of the bolt 1.
  • The-switchshown'atFi'gJfi is provided with a heating resistor 9 in'place of'themanually operable push rod of Fig. '1, butin all other respects is similar to the switch of-Fig's..l-5,"and like-parts have been assignedthe same referencenumerals.
  • the over-center reversing action is self -propelled along the length of the side arms and forces a reversal of the transverse curvature at the weakened sections BB at the top of the blade.
  • the entire blade then reverses its dished formation, so that the high expansion lamination is on the convex side of the blade.
  • This action causes a reversal of the angular displacement of the central arm 3a to the other side of the normal plane of the blade 3, thereby separating the contacts 2 and 4.
  • Figs. 7, 8 and 9 we have shown various modified forms of over-center snap acting blades which may be utilized in snap acting devices embodying my invention.
  • Fig. '7 shows a blade which is generally similar to that shown at Figs. 1, 2 and 6, except that the central switch arm is extended to the outer as well as the inner side of the ring and provided with a contact at each end.
  • Fig. 8 shows another blade of generally U-shaped configuration, but in which the side arms are straight and substantially parallel rather than ring shaped as heretofore described.
  • Fig. 9 shows a double ended form of the blade shown at Fig. 8. It will be understood that the blade shown at Fig. 9 is mounted at its center, as .by a cambered mounting bracket disposed centrally between the two side arms.
  • any of the snap acting blades shown at Figs. 7, 8 and 9 may be formed either of a homogeneous spring material such as a resilient copper alloy, or may be formed of composite metal such as the bimetallic blade heretofore described in connection with Fig. 6.
  • a snap action device comprising a normally fiat resilient blade formed to provide a pair of side arms and a reentrant central arm disposed in edgewise side-by-side relation and connected together at one end of said central arm, said blade having a reduced transverse section at the points of connection of said side and central arms and when unstressed lying in a normal plane with said side arms juxtaposed in a region adjacent the other end of said central arm, means for holding said side arms in cambered relation at said region and about the axis of said central arm thereby to stress and deform said blade into a dished formation and angularly displace said central arm from said normal plane, means for holding said side arms in abnormal spaced relation at said region thereby further to stress said blade, and means for inverting the dished formation of said blade thereby to reverse the angular displacement of said central arm with a snap action.
  • a snap action device comprising a normally flat resilient blade formed to provide a pair of side arms and a reentrant central arm disposed in edgewise side-by-side relation and connected together at one end of said central arm, said blade having a reduced transverse section at the points of connection of said side and central arms and when unstressed lying in a normal plane with said side arms spaced apart a predetermined normal distance in a region adjacent the other end of said central arm, means for holding said side arms in cambered relation at said region and about the axis of said central arm thereby to stress and deform said blade into a dished formation and angularly displace said central arm from said normal plane, adjustable means for holding said side arms in abnormal spaced apart relation at said region thereby adjustably to further stress said blade, the internal stress in said blade being concentrated at said reduced sections, and means for inverting the dished formation of said blade thereby to reverse the angular displacement of said central arm with a snap action.
  • a snap action device comprising a normally fiat resilient metal blade slotted to form a flat split ring and having a U-shaped re-entrant portion opposite the juxtaposed ends of said ring forming an inwardly extending arm, said ring having a reduced transverse section at each point of connection of said arm and ring and when unstressed lying in a normal plane, with said juxtaposed ends in a predetermined normal spaced relation, means for holding said juxtaposed ends in cambered relation thereby to deform said ring to a dished formation and bias said arm to a position of angular displacement to one side of said normal plane, clamping means for holding said juxtaposed ends in abnormal spaced relation thereby to concentrate internal stress in said ring at said reduced sections, and means for inverting the dished formation of said ring thereby to snap said arm to a reversed position of equilibrium oppositely angularly displaced from said normal plane.
  • a snap action electric switch comprising a base, a stationary contact mounted upon said base, a normally fiat resilient switch blade formed to provide a pair of side arms and a re-entrant central arm disposed in edgewise side-by-side relation and connected together at one end of said central arm, said blade when unstressed lying in a normal plane with said side arms juxtaposed in a region adjacent the other end of said central arm, a movable contact mounted upon said other end of said central arm, means for holding said side arms in cambered relation at said region, said holding means deforming said blade into a dished formation and angularly displacing said central arm from said normal plane with said movable contact on the convex side of said blade, and means for pressing said blade toward said stationary contact thereby to invert the dished formation of said blade and reverse the angular displacement of said central arm with a snap action.
  • a snap action electric switch comprising a base, a stationary contact mounted upon said base, a normally fiat resilient switch blade including a pair of side arms and a re-entrant central arm disposed in edgewise side-by-side relation and connected together at one end of said central arm, said blade when unstressed lying in a normal plane with said side arms in a predetermined normal spaced relation in a.
  • a movable contact mounted upon said other end of said central arm, means for mounting said blade upon said base and holding said side arms in cambered relation at said region and about the axis ofrsaid; .centralsarm; saidmounting:.- means deforming said-blade into a 1 dishedgformation concave on the side remote-from.- said movable contact andangularly displacing said central arm from said normal plane, meansfor holding said side: armsnin abnormalspaced relation atlsaid regiomand means for pressingsaidblade to,- ward said stationary. contact thereby to invert the: dished formation of said bladeand-reverse the :vangular, displacement of, sa-id-v .central-rarm with a snap-action.
  • a snap action thermostat comprising a normally flat substantially U shaped-bimetallicblade having at its bight portion a re-entrant central arm, said blade having a reduced transverse section 'at1the point of connection of each sidearm thereof with saidcentral. arm. and a when.
  • a snap action thermostatic switch comprise ing. a base, .a fixed contact mounted uponsaid base, a normally fiat bimetallic switch: blade formed to provide a pair of,side-arms and ,a reentrant central arm disposed in edgewise sideby-side relation and connected together at one end of said central arm, said blade having a reduced transverse section atthe point of connection of each side arm thereof with the-said central arm and when unstressed lying in a normal planewith said side arms spaceduapart in a region adjacent. the-other; end. of.
  • saidcentral arm a movable contact mounted upon said other end of said central arm and on the low expansion side of said blade, and means for mounting said blade upon said base, said mounting means holding said side arms in cambered relation at said region and about the axis of said-central arm with the high expansion metal of said blade on the concave side thereof thereby. to deform said blade into a dished formation and angularly displace said central arm from saidnormal plane and toward the convex side of saidv blade, said blade when heated reversing its .dish formation thereby to snap said central arm to a reverse position of angular displacement. withrespect to saidnormal plane.
  • a snap action thermostaticswitch comprising a base, a fixed contact-mounted-upon said base, a normally flat bimetallic switch blade in, cluding a pair of substantially parallel side arms and a re-entrant central arm disposed in edgewise side-by-side relation and connected ,togethr at one end of said central-arm, said blade having areduced transverse section at the point of connection of each side arm thereof with the said central arm-and when unstressed-lying in a normal plane with saidside arms spaced: apart a predetermined normal .distance:ina regiorrzad+ jacent the otheraend of said central. arm-,a move able contact mounted at.
  • said other end of said central-arm on-the low expansion side of said bladev for cooperation with said fixed contact, means for mounting said blade upon said base and holding said side arms in cambered relation atsaid region and about the axis of said centralarm, said mounting means deforming said bladeinto a dished formation with the high expansionzmetal on the concave side thereof. and angularly displacing said central arm' toward the; convex side thereof to bring said contact into engagement, and means for holding said side armsin abnormal spaced apart relation at .said region, said blade when heated first increasing the pressure between said contacts and then reversingits dished formation thereby to snap saidcentral arm to. a reverse position of angular displacement and separate said contacts 9.
  • a snap action thermostatic switch comprisinga base-,- a fixedcontact mounted upon said base, a normally flat bimetallic switch blade formed to provide a pair of side arms and a substantially U.-shaped re-entrant central arm dispised-in edgewise'side-by-side relation and connected together at-the open end of said central arm, said blade having.
  • a snap action thermostatic switch comprising a base, a fixed contact mounted upon said base, a normally flat bimetallic switch blade formed to provide a pair of side arms and a substantially U-shaped re-entrant central arm disposedin edgewise side-by-side relation and connected together.
  • a snap action thermostatic switch comprising a base, a fixed contact mounted upon said base, a normally flat substantially U-shaped bimetallic switch blade having at its bight portion a substantially U-shaped re-entrant central arm, said blade having reduced transverse sections at the points of connection of said central arm with the side arms of said blade and when unstressed lying in a normal plane with the juxtaposed ends of said side arms spaced apart a predetermined normal distance, a movable contact mounted upon the inner end of said central arm at the low expansion side of said blade, means for mounting said blade upon said base and holding said juxtaposed ends of said side arms in cambered relation thereby to deform said blade into a dished formation, said blade when so dished having the high expansion metal thereof on the concave side with said central arm angularly displaced from said normal plane toward the convex side to bring said contacts into engagement, and adjustable means for holding the juxtaposed ends of said side arms in abnormal spaced apart relation thereby to concentrate deformation of said blade at said reduced sections, said
  • a snap action thermostatic switch comprising a base, a fixed contact mounted upon said base, a normally fiat bimetallic switch blade formed as a split fiat ring having a substantially U-shaped re-entrant arm opposite the juxtaposed ends of said ring, said ring having weakened sections at its points of connection to said re-entrant arm and when unstressed lying in a normal plane with said juxtaposed ends in predetermined normal spaced relation, a movable contact mounted upon the inner end of said arm on the low expansion side of said blade, means mounting said blade upon said base and holding said juxtaposed ends in cambered relation, said mounting means deforming said ring to a dished formation with the high expansion metal on the concave side thereof and biasing said arm to a position of angular displacement toward the con vex side of said deformed ring, and adjustable means for holding said juxtaposed ends of said ring in abnormal spaced relation thereby to concentrate internal stress in said ring at said reduced sections, said blade when heated first defleeting to increase
  • a snap action thermostat comprising a normally flat bimetallic blade formed to provide a pair of side arms and a re-entrant central arm disposed in side-by-side relation and connected together at one end of said central arm, said blade having a reduced transverse section at the point of connection of each of the said side arms with the central arm and when unstressed lying in a normal plane with said side arms spaced apart a predetermined normal distance in a region adjacent the other end of said central arm, means for holding said side arms in cambered relation at said region and about the axis of said central arm thereby to stress and deform said blade into a dished formation and angularly displace said central arm from said normal plane, and adjustable means for holding said side arms in abnormal spaced apart relation at said region thereby adjustably to further stress said blade, said blade when changed in temperature a predetermined amount inverting its dished formation thereby to reverse the angular displacement of said central arm with a snap action.

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  • Thermally Actuated Switches (AREA)
US205282A 1951-01-10 1951-01-10 Snap action switch Expired - Lifetime US2624819A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE508318D BE508318A (xx) 1951-01-10
US205282A US2624819A (en) 1951-01-10 1951-01-10 Snap action switch
FR1051560D FR1051560A (fr) 1951-01-10 1952-01-10 Interrupteurs perfectionnés à fonctionnement brusque

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Application Number Priority Date Filing Date Title
US205282A US2624819A (en) 1951-01-10 1951-01-10 Snap action switch

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US2624819A true US2624819A (en) 1953-01-06

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US205282A Expired - Lifetime US2624819A (en) 1951-01-10 1951-01-10 Snap action switch

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BE (1) BE508318A (xx)
FR (1) FR1051560A (xx)

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US28578A (en) * 1860-06-05 Appaeatus for heating air by steam
US2706227A (en) * 1953-08-18 1955-04-12 Signal Stat Corp Snap action vane
US2729719A (en) * 1953-07-24 1956-01-03 Honeywell Regulator Co Control device
US2756304A (en) * 1953-08-18 1956-07-24 Signal Stat Corp Snap-action device
US2776352A (en) * 1953-02-19 1957-01-01 Sunvic Controls Ltd Electric snap-action switch devices
US2777032A (en) * 1953-05-12 1957-01-08 Burch Parkhurst Associates Snap switch and blade therefor
US2793268A (en) * 1954-07-01 1957-05-21 Gen Mills Inc Thermal relay with shorting strip
US2822437A (en) * 1952-08-30 1958-02-04 Landis & Gyr Ag Flexible contact for control switch
US2825785A (en) * 1951-05-16 1958-03-04 Eric H Taylor Thermally controlled electric switches
US2861143A (en) * 1957-07-25 1958-11-18 Anderson Controls Inc Stressed blade snap switch
US2951137A (en) * 1958-12-24 1960-08-30 Texas Instruments Inc Thermostatic switch
DE1091179B (de) * 1956-11-28 1960-10-20 Haegglund & Soener Ab Elektrischer Schnappschalter mit Kontaktbruecke
DE1099036B (de) * 1956-07-07 1961-02-09 Electrovac Hacht & Huber Fabri Elektrischer Schnappschalter
US3052775A (en) * 1960-08-10 1962-09-04 Gen Motors Corp Governor mechanism
US3105886A (en) * 1960-07-05 1963-10-01 Hadley K Burch Snap-acting mechanisms
US3192346A (en) * 1963-06-03 1965-06-29 Gen Electric Current and temperature snap acting devices
US3196233A (en) * 1962-08-28 1965-07-20 Lyndon W Burch W blade thermostat with free-ended moment arm
US3238780A (en) * 1963-02-20 1966-03-08 Robertshaw Controls Co Ambient compensated bimetal elements
DE1224804B (de) * 1961-09-25 1966-09-15 Lyndon Walkup Burch Elektrischer Schnappschalter
US3288963A (en) * 1964-01-29 1966-11-29 Demoly Freres & Cie Ets Miniature snap-action switch
US3309476A (en) * 1963-02-25 1967-03-14 Mckie Stephen Domville Quick acting make-and-break microswitch
US3372254A (en) * 1966-09-22 1968-03-05 Burch Hadley Keys Snap-acting switch means
US3632921A (en) * 1970-01-19 1972-01-04 Tbeodore Y Korsgren Snap action construction
US3668347A (en) * 1970-01-19 1972-06-06 Robertshaw Controls Co Snap acting electrical switch construction having reset means
USRE28578E (en) * 1961-09-25 1975-10-21 Snap-acting mechanisms
US4796355A (en) * 1987-09-15 1989-01-10 B/K Patent Development, Inc. Snap action devices and methods and apparatus for making same
US4822959A (en) * 1988-01-25 1989-04-18 Schwab-Koplin Assoc., Inc. Electrical switch having a snap-acting switch element
US5149150A (en) * 1988-12-14 1992-09-22 Kathryn L. Acuff Trust Motion transmitting and amplifying device
US5226634A (en) * 1990-08-31 1993-07-13 Amp Incorporated Platform spring
US5269499A (en) * 1992-07-09 1993-12-14 Schwab Pierre P Snap spring positioning device
US6538553B2 (en) * 2001-07-13 2003-03-25 Tsung-Mou Yu Switching element for electric switch
US6705813B2 (en) 2002-02-07 2004-03-16 Pierre P. Schwab Snap disc device
US20120126930A1 (en) * 2009-06-05 2012-05-24 Hofsaess Marcel P Bimetal part and temperature-dependent switch equipped therewith
USD895416S1 (en) * 2018-01-12 2020-09-08 Senju Sprinkler Co., Ltd. Spring for sprinkler head

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2828385A (en) * 1955-01-20 1958-03-25 Wilcolator Co Heavy duty circuit breaker and bimetal thermostatic unit therefor
DE1038639B (de) * 1955-10-21 1958-09-11 Cav Ltd Elektrischer Zug-Druck-Schalter
DE2819795C2 (de) * 1978-05-05 1986-05-15 Elektromanufaktur Zangenstein Hanauer GmbH & Co, 8471 Altendorf Schnappschalter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1895592A (en) * 1930-09-08 1933-01-31 Gen Plate Co Snap acting device
US2361193A (en) * 1939-07-12 1944-10-24 Radio Patents Corp Control device, particularly thermostatic device
US2533671A (en) * 1948-04-13 1950-12-12 Acro Mfg Co Method and means for mounting snap action switch blades

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1895592A (en) * 1930-09-08 1933-01-31 Gen Plate Co Snap acting device
US2361193A (en) * 1939-07-12 1944-10-24 Radio Patents Corp Control device, particularly thermostatic device
US2533671A (en) * 1948-04-13 1950-12-12 Acro Mfg Co Method and means for mounting snap action switch blades

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US28578A (en) * 1860-06-05 Appaeatus for heating air by steam
US2825785A (en) * 1951-05-16 1958-03-04 Eric H Taylor Thermally controlled electric switches
US2822437A (en) * 1952-08-30 1958-02-04 Landis & Gyr Ag Flexible contact for control switch
US2776352A (en) * 1953-02-19 1957-01-01 Sunvic Controls Ltd Electric snap-action switch devices
US2777032A (en) * 1953-05-12 1957-01-08 Burch Parkhurst Associates Snap switch and blade therefor
US2729719A (en) * 1953-07-24 1956-01-03 Honeywell Regulator Co Control device
US2706227A (en) * 1953-08-18 1955-04-12 Signal Stat Corp Snap action vane
US2756304A (en) * 1953-08-18 1956-07-24 Signal Stat Corp Snap-action device
US2793268A (en) * 1954-07-01 1957-05-21 Gen Mills Inc Thermal relay with shorting strip
DE1099036B (de) * 1956-07-07 1961-02-09 Electrovac Hacht & Huber Fabri Elektrischer Schnappschalter
DE1091179B (de) * 1956-11-28 1960-10-20 Haegglund & Soener Ab Elektrischer Schnappschalter mit Kontaktbruecke
US2861143A (en) * 1957-07-25 1958-11-18 Anderson Controls Inc Stressed blade snap switch
US2951137A (en) * 1958-12-24 1960-08-30 Texas Instruments Inc Thermostatic switch
US3105886A (en) * 1960-07-05 1963-10-01 Hadley K Burch Snap-acting mechanisms
US3052775A (en) * 1960-08-10 1962-09-04 Gen Motors Corp Governor mechanism
USRE28578E (en) * 1961-09-25 1975-10-21 Snap-acting mechanisms
DE1224804B (de) * 1961-09-25 1966-09-15 Lyndon Walkup Burch Elektrischer Schnappschalter
US3196233A (en) * 1962-08-28 1965-07-20 Lyndon W Burch W blade thermostat with free-ended moment arm
US3238780A (en) * 1963-02-20 1966-03-08 Robertshaw Controls Co Ambient compensated bimetal elements
US3309476A (en) * 1963-02-25 1967-03-14 Mckie Stephen Domville Quick acting make-and-break microswitch
US3192346A (en) * 1963-06-03 1965-06-29 Gen Electric Current and temperature snap acting devices
US3288963A (en) * 1964-01-29 1966-11-29 Demoly Freres & Cie Ets Miniature snap-action switch
US3372254A (en) * 1966-09-22 1968-03-05 Burch Hadley Keys Snap-acting switch means
US3632921A (en) * 1970-01-19 1972-01-04 Tbeodore Y Korsgren Snap action construction
US3668347A (en) * 1970-01-19 1972-06-06 Robertshaw Controls Co Snap acting electrical switch construction having reset means
US4796355A (en) * 1987-09-15 1989-01-10 B/K Patent Development, Inc. Snap action devices and methods and apparatus for making same
US4822959A (en) * 1988-01-25 1989-04-18 Schwab-Koplin Assoc., Inc. Electrical switch having a snap-acting switch element
US5149150A (en) * 1988-12-14 1992-09-22 Kathryn L. Acuff Trust Motion transmitting and amplifying device
US5226634A (en) * 1990-08-31 1993-07-13 Amp Incorporated Platform spring
US5269499A (en) * 1992-07-09 1993-12-14 Schwab Pierre P Snap spring positioning device
US6538553B2 (en) * 2001-07-13 2003-03-25 Tsung-Mou Yu Switching element for electric switch
US6705813B2 (en) 2002-02-07 2004-03-16 Pierre P. Schwab Snap disc device
US20120126930A1 (en) * 2009-06-05 2012-05-24 Hofsaess Marcel P Bimetal part and temperature-dependent switch equipped therewith
US9355801B2 (en) * 2009-06-05 2016-05-31 Marcel P. HOFSAESS Bimetal part and temperature-dependent switch equipped therewith
USD895416S1 (en) * 2018-01-12 2020-09-08 Senju Sprinkler Co., Ltd. Spring for sprinkler head

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BE508318A (xx)
FR1051560A (fr) 1954-01-18

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JPS6043616B2 (ja) スナツプ作動型バイメタルアクチユエータ