US3238344A - Externally controlled hermetically enclosed electric switch - Google Patents

Externally controlled hermetically enclosed electric switch Download PDF

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Publication number
US3238344A
US3238344A US241380A US24138062A US3238344A US 3238344 A US3238344 A US 3238344A US 241380 A US241380 A US 241380A US 24138062 A US24138062 A US 24138062A US 3238344 A US3238344 A US 3238344A
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US
United States
Prior art keywords
cap
base
wall
electric switch
microswitch
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
US241380A
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English (en)
Inventor
Miachon Louis
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.)
Compagnie Electro Mecanique SA
Original Assignee
Compagnie Electro Mecanique SA
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Publication date
Application filed by Compagnie Electro Mecanique SA filed Critical Compagnie Electro Mecanique SA
Application granted granted Critical
Publication of US3238344A publication Critical patent/US3238344A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/04—Cases; Covers
    • H01H13/06—Dustproof, splashproof, drip-proof, waterproof or flameproof casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/04—Cases; Covers
    • H01H13/06—Dustproof, splashproof, drip-proof, waterproof or flameproof casings
    • H01H2013/066—Dustproof, splashproof, drip-proof, waterproof or flameproof casings using bellows

Definitions

  • the present invention which is due to Mr. Louis Miachon, relates to hermetic apparatus in which the internal mechanism comprises a moving member adapted to be displaced from the outside.
  • the invention has for its object to provide an apparatus of the type in question which is of simple and robust construction and which can be made with extremely small dimensions, and it is applicable more particularly to electric switches of the type known as micro-switches, but it is to be understood that this reference is in no way limiting and that the invention may advantageously be employed with any other type of electrical or non-electrical apparatus (circuit breaker, thermostat, valve, etc.
  • the invention has for its object to obviate the aforesaid difiiculties.
  • the apparatus according to the invention comprises essentially a base on which there is fitted by welding a cap having a deformable upper portion and integrally formed by the process known as chromizing, that is to say, by the formation of a compound of chromium and iron on a steel core which is thereafter removed by means of acid.
  • the cap is substantially cylindrical and its deformable portion consists of its upper end made in flat form with one or more concentric corrugations in the manner known in load-measuring cells.
  • the centre of the said upper end may comprise a recess adapted to receive a member acting as a transmission means between the said end and the internal mechanism.
  • the cylindrical portion may be formed with double thickness so as to have very great rigidity.
  • the deformable portion consists of the top of the cylindrical portion of the cap, constructed in the form of a bellows having superposed circular corrugations.
  • the base is made of sintered alumina, porcelain or other material of the same type with a circular groove adapted to receive the lower edge of the cap, the said groove being metallised and receiving a soldering head which is brought into the liquid state at the time when the cap is positioned.
  • FIGURE 1 is a plan view of an electric microswitch according to the invention.
  • FIGURE 2 is a vertical section along the line 11-11 (FIGURE 1).
  • FIGURE 3 is a plan view of the base in the insulated condition, the posts supporting the internal mechanism being assumed to be cut away.
  • FIGURES 4 and 5 are sections similar to that of FIG- URE 2, but showing two variants of the invention.
  • the device illustrated in FIGURES 1 to 3 comprises a .base 1 made, for example, of sintered alumina or porcelain, into which three metal supporting posts 2, 3 and 4, respectively have been let during the moulding.
  • the base 1 which is circular in the illustrated example, has in its upper face a circular groove 1a situated in the immediate neighbourhood of its periphery. It is also formed with an orifice 1b, in which there has been mounted in fluid-tight fashion, for example in the moulding before the firing (as in the case of the three posts), an appropriate duct 5 for exhausting the device after sealing, and for introducing into it an appropriate inert gas (nitrogen, argon, hydrogen, etc.
  • an appropriate inert gas nitrogen, argon, hydrogen, etc.
  • the post 2 supports the mechanism 6 of the switch, which mechanism is very diagrammatically illustrated in FIGURE 2 in the form of an appropriately stamped blade.
  • the mechanism employed may be, for example, of the type comprising rolling springs or spring blades of appropriate configuration, these examples only being intended to give a cleaner idea.
  • Mounted on the end of the mechanism 6 is the double movable contact 7, which moves between a first fixed contact 8 supported by the post 3 and a second fixed contact 9 indicated by broken lines in FIGURE 2 and supported by the post 4 situated in front of the sectional plane of the latter figure.
  • the said cap comprises a cylindrical wall 10a, of which the lower edge is engaged in the groove 1a and is secured therein by soldering, as will hereinafter be explained.
  • the upper end of the cylindrical wall 10a is closed by a circular end member 10b formed with a concentric corrugation 10c intended to enable it to be deformed.
  • the centre of the end member 10b comprises a portion 10d in the form of an inverted cylindrical cup, into which there is force-fitted a head 11 fast with a stem 11a which acts on the mechanism 6.
  • the assembly 11-11a is preferably made of insulating material.
  • the mechanism 6 can, in the inoperative position, maintain the double movable contact 7 against the lower fixed contact 8, while when pressure is applied to the central portion 10a of the end member 10b the displacement of the stem 11a brings the mechanism 6 from one of its positions to the other, thus bringing the movable contact 7 against the upper fixed contact 9.
  • the cap 10 is formed by chromizing, that is to say, by forming on the surface of a steel core situated in an appropriate ammoniacal atmosphere a layer of a compound of chromium and iron and then cutting away one of the ends of the article obtained so as to expose the steel core and subjecting the latter to the action of acid until only the film of chromium-iron compound is left, which film can be given any thickness.
  • connection between the cap 10 thus formed and the base 1 is obtained in the manner indicated in French Patent No. 1,240,552, applied for on July 25, 1959, in the name of applicants, for Improvement in Electric Switches.
  • the groove 1a has been metallised by any appropriate method.
  • an appropriate solder whereafter the cap 10 has been positioned and the solder has been brought to the liquid state (for example by highfrequency heating), while at the same time the cap has been forced against the base in such manner that its lower edge penetrates to the base of the groove.
  • the cap is thus united with the base in an absolutely hermetic form and the assembly precision is limited only by the manufacturing tolerances of the cap and of the base, and is unaffected by the solder bead 12.
  • the invention thus provides a completely hermetic switch which can be mass-produced without any particular difliculty and at a very low cost.
  • This device may be of very small dimensions, if desired, without its manufacture or its assembly thus being in any way complicated.
  • cylindrical wall 10a of the casing 10 and the end member 1% of the latter must satisfy two contradictory conditions.
  • the wall 10a must be completely rigid against compressive forces exerted on the device, while the end member 10b must behave in the manner of a resilient deformable diaphragm.
  • the cylindrical form of the wall 10a and the concentric corrugation 100 in the end member 10b tend to ensure that these conditions are fully satisfied, and that it is possible, if desired, to give the cordugation 10 a greater height or even to provide a plurality of corrugations such as 10c concentric to one another.
  • FIGURE 4 shows how the rigidity of the cylindrical wall may be increased when necessary.
  • the said wall 10a is of triple thickness, i.e., it has an external thickness of chromium-iron compound, an intermediate thickness of steel and an internal thickness of chromium-iron compound.
  • the initial lateral wall of the core may be sufficiently thin to be saturated with chromium throughout its mass, the final thickness then being substantially double that of the end portion.
  • FIGURE 5 shows another modified embodiment in which the deformability necessary to enable the internal mechansm of the switch to be actuated is afforded, not by the end member b, which is plane and consequently relatively rigid, but by corrugations 10c provided in the top of the cylindrical wall 10a. These corrugations con- 4 vert the top of the wall 10a into a form of metal bellows which is extremely deformable, even if the thickness of metal is relatively great.
  • transverse end wall is formed with at least one substantially circular corrugation concentric with the axis of said cap so as to increase the ability of said wall to yield in axial direction of said cap.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
US241380A 1962-11-13 1962-11-30 Externally controlled hermetically enclosed electric switch Expired - Lifetime US3238344A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR42093A FR1324242A (fr) 1962-11-13 1962-11-13 Perfectionnements aux appareils hermétiques à commande extérieure

Publications (1)

Publication Number Publication Date
US3238344A true US3238344A (en) 1966-03-01

Family

ID=43921099

Family Applications (1)

Application Number Title Priority Date Filing Date
US241380A Expired - Lifetime US3238344A (en) 1962-11-13 1962-11-30 Externally controlled hermetically enclosed electric switch

Country Status (5)

Country Link
US (1) US3238344A (fr)
BE (1) BE625019A (fr)
ES (1) ES282851A1 (fr)
FR (1) FR1324242A (fr)
GB (1) GB1023188A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS512678U (fr) * 1974-06-21 1976-01-09
US3982089A (en) * 1974-11-29 1976-09-21 Seiko Instruments Incorporated Pushbutton switch
US4311884A (en) * 1979-05-21 1982-01-19 C & K Components, Inc. Miniature sealed dual-in-line switch
US4764742A (en) * 1984-11-13 1988-08-16 Tocksfors Verkstads Ab Relay
US4771139A (en) * 1986-06-27 1988-09-13 Desmet Gregory L Keyboard with metal cover and improved switches
US5156351A (en) * 1989-03-10 1992-10-20 Daniel Cittadini Electric fishing reel
US5626222A (en) * 1995-10-06 1997-05-06 Ncr Corp Force controllable shielded mechanical switch actuators

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2940656A1 (de) * 1979-10-06 1981-04-16 Felten & Guilleaume Carlswerk AG, 5000 Köln Hermetisch geschlossener permanentmagnetischer ausloeser

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1862231A (en) * 1928-06-22 1932-06-07 Wadsworth Watch Case Co Decorating base metals or alloys of base metals
GB620961A (en) * 1947-02-05 1949-04-01 Crabtree & Co Ltd J A Improvements in and connected with electric switches of the push button type
US2509227A (en) * 1946-07-29 1950-05-30 Gordy Irving Device to introduce rotary motion into a sealed casing
US2728826A (en) * 1952-02-09 1955-12-27 W L Maxson Corp Snap action switch
US2800438A (en) * 1955-07-26 1957-07-23 Metal & Thermit Corp Chromium plating
FR1240552A (fr) * 1959-07-25 1960-09-09 Normacem Sa Perfectionnement aux interrupteurs électriques
US3015010A (en) * 1959-11-27 1961-12-26 Orion S Greeson Environment free switch
US3030465A (en) * 1960-08-30 1962-04-17 John O Roeser Switch
US3054879A (en) * 1960-01-20 1962-09-18 Indak Mfg Corp Pushbutton switch

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1862231A (en) * 1928-06-22 1932-06-07 Wadsworth Watch Case Co Decorating base metals or alloys of base metals
US2509227A (en) * 1946-07-29 1950-05-30 Gordy Irving Device to introduce rotary motion into a sealed casing
GB620961A (en) * 1947-02-05 1949-04-01 Crabtree & Co Ltd J A Improvements in and connected with electric switches of the push button type
US2728826A (en) * 1952-02-09 1955-12-27 W L Maxson Corp Snap action switch
US2800438A (en) * 1955-07-26 1957-07-23 Metal & Thermit Corp Chromium plating
FR1240552A (fr) * 1959-07-25 1960-09-09 Normacem Sa Perfectionnement aux interrupteurs électriques
US3015010A (en) * 1959-11-27 1961-12-26 Orion S Greeson Environment free switch
US3054879A (en) * 1960-01-20 1962-09-18 Indak Mfg Corp Pushbutton switch
US3030465A (en) * 1960-08-30 1962-04-17 John O Roeser Switch

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS512678U (fr) * 1974-06-21 1976-01-09
US3982089A (en) * 1974-11-29 1976-09-21 Seiko Instruments Incorporated Pushbutton switch
US4311884A (en) * 1979-05-21 1982-01-19 C & K Components, Inc. Miniature sealed dual-in-line switch
US4764742A (en) * 1984-11-13 1988-08-16 Tocksfors Verkstads Ab Relay
US4771139A (en) * 1986-06-27 1988-09-13 Desmet Gregory L Keyboard with metal cover and improved switches
US5156351A (en) * 1989-03-10 1992-10-20 Daniel Cittadini Electric fishing reel
US5626222A (en) * 1995-10-06 1997-05-06 Ncr Corp Force controllable shielded mechanical switch actuators

Also Published As

Publication number Publication date
ES282851A1 (es) 1963-05-01
FR1324242A (fr) 1963-04-19
BE625019A (fr) 1963-03-15
GB1023188A (en) 1966-03-23

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