US2798130A - Electric switch devices - Google Patents

Electric switch devices Download PDF

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Publication number
US2798130A
US2798130A US356812A US35681253A US2798130A US 2798130 A US2798130 A US 2798130A US 356812 A US356812 A US 356812A US 35681253 A US35681253 A US 35681253A US 2798130 A US2798130 A US 2798130A
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United States
Prior art keywords
diaphragm
member
switch
electric switch
pressure
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Expired - Lifetime
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US356812A
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Irvin W Cox
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Cutler Hammer Inc
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Cutler Hammer Inc
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Priority to US356812A priority Critical patent/US2798130A/en
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Publication of US2798130A publication Critical patent/US2798130A/en
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00Switches operated by change of a physical condition
    • H01H35/24Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/34Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
    • H01H35/346Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm in which the movable contact is formed or directly supported by the diaphragm
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00Switches operated by change of a physical condition
    • H01H35/24Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/34Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
    • H01H35/343Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm by snap acting diaphragm

Description

July 2, 1957 1. w. cox 2,798,130

ELECTRIC SWITCH DEVICES Filed May 22, 1955 States ELECTRIC SWITCH DEVICES Irvin W. Cox, West Allis, Wis., assignor to Cutler-Harnrner, Inc, Milwaukee, Wis., a corporation of Delaware This invention relates to electric switch devices and particularly switch devices which are responsive to pressure and/ or temperature.

A primary object of the invention is to provide electric switch devices of the character described which will be inexpensive to manufacture, and which will be reliable in operation.

Another object is to provide such a device which may be used as an overload switch, or as a thermostat, or both.

Another object i to provide such a device which is frictionless in operation and is unaflected by dust or humidity.

Another object is to provide a switch device of the character described which may be readily manufactured in normally open, normally closed, automatically recycling, or non-recycling, types.

Other objects and advantages of the invention will hereinafter appear.

The accompanying drawings illustrate certain embodiments of the invention which will now be described, it being understood that certain modifications in respect of structural details may be made in the embodiments illustrated without departing from the spirit or scope of the invention as defined by the appended claims.

In the drawings, Figure 1 is a cross sectional view of a diaphragm member;

Fig. 2 is a top plan view of the member shown in Fig. 1;

Fig. 3 i a view in cross section of a switch device embodying the invention;

Fig. 4 is a view in cross section of a modified form of the device shown in Fig. 3;

Fig. 5 is a view in cross section of an alternative form of a switch device embodying the invention; and,

Fig. 6 is a fragmentary cross sectional view of an alternative form of switch contacts.

Referring to Figs. 1 to 4, inclusive, of the drawings, the numeral 10 generally designates a diaphragm member which may be die-formed or stamped from a suitable metal blank. Member 10 is provided with a substantially circular bulge 14, the central or diaphragm portion 16 of which is re-entrant with respect to the bulge. In this embodiment the central portion 16 is normally disposed or biased so that the apex 18 thereof normally extends beyond the plane of the periphery of the bulge 14. One side of member 19, as shown, may be provided with an extension having therein a perforation 12 adapted to facilitate connection of the member in an electric circuit.

When member 10 is attached at a peripheral portion or ring 20 about its bulge portion 14 to a substantially rigid or inflexible metal plate 22, as shown in Fig. 3, the apex 18 will normally engage the plate. The central portion or diaphragm 16 will thus be displaced, and by its resilience will normally cause apex 18 to engage plate 22 with a predetermined degree of pressure to afford a good electrical connection therebetween. Member 10 is 2,798,130 Patented July 2, 1957 secured to plate 22 by an insulating and sealing material 24, hereinafter more fully described, to provide a sealed unit, and the same is normally electrically insulated from plate 22 except at apex 18.

The unit is filled with a suitable fluid 25 such as a vapor which at some critical temperature, and consequent pressure thereof, causes the diaphragm 16 to move outwardly from its relative re-entrant position in the bulge. This motion is similar to the action of an oil can and occurs with a snap movement. Apex 18 is held in firm electrical contact with plate 22 until withdrawn therefrom with a snap action by the diaphragm 16.

An electric current flowing between member 10 and plate 22 through apex 18 will heat member 10 and plate 22 and the fluid 25 therebetween. At some critical temperature caused by the flow of excessive current resulting from an overload or the like, the diaphragm 16 of member 10 will snap outwardly to break the contact between apex 18 and plate 22 and thereby interrupt the circuit. The diaphragm 16 would then assume a shape somewhat like that of diaphragm 16 in Fig. 4 which illustrates a normally open switch device as hereinafter more fully described. When applicable, the diaphragm member 10 may be connected in series in one electrical circuit and the plate may be connected in series in another. The circuits will be interconnected through apex 18 until a critical temperature and/ or pressure is reached.

By the use of design methods well known in the art the normal disposition or biasing of diaphragm 16 may be made such that as the fluid cools the diaphragm 16 will return to its normal position to effect reclosure of the switch. Or the biasing may be made sufiiciently extreme so that additional external force is required to return the diaphragm 16 to its switch-closed position.

In addition to acting as a thermally responsive overload switch, the device will act as a thermostat responsive to the temperature of the atmosphere and/ or objects surrounding it. The diaphragm 16 (see Fig. 4) is normally disposed or biased in such manner that instead of being normally re-entrant with respect to the bulge 14 it normally extends outwardly of the bulge to provide a normally open switch. Except for this difference the switch device of Fig. 4 may be like that shown in Fig. 3. Upon the reduction of the fluid pressure to some preselected value the diaphragm 16* will snap inwardly in a re-entrant relationship to the bulge 14?. Contact will be effected and maintained between apex 18 and plate 22 until the fluid pressure increases sufliciently to permit snapping of the diaphragm 16 back to its normal position.

Although in Figs. 1 to 4, inclusive, apices 18 and 18 and plates 22 and 22 are shown as adapted to engage one another directly, it may be preferable for certain applications of these switches to provide either or both of their respective apices and plates with a contact member such as contact tips 26, 26 illustrated in Fig. 5. This figure shows a switch unit which contains a fluid 29 and comprises two like diaphragm members 30, 30 secured together, as shown, at their respective peripheral or ring portions 34, 34 through the medium of a suitable insulating and sealing material 33. Contact tips 26, 26 are secured to the alined apices 40, 40 of the respective central portions of diaphragm members 30, 30. These diaphragm members 30, 31 may, like member 10, be normally disposed or biased to provide for automatic or non-recycling action, and for normally closed or for normally open positioning of the switch contacts 26, 26. Moreover, said device may be used either as a thermostat or as an overload switch, as desired.

It will be apparent to those familiar with the art that the plates 22 and 22 and the respective diaphragm members need not have the particular shapes, illustrated in the drawings. Other shapes of diaphragms might be utilized to provide an action similar to the action described, and such diaphragrns might be normally disposed or biased by well knownprocedures to provide the various modes of operation above set forth.

The body of material (24, 2'4 and 38) may be of any suitable insulating and sealing material. Vitreous enamel may be used, especially if the diaphragm members and plates are made of enameling steel, or stainless steel. Pulverized glass may be used with nickel-copper alloys; and pulverized borosilicate glass is satisfactory when used with beryllium-copper alloys. Said insulating and sealing material is fired to provide astrong bond between the same and the metal parts.

The units may be filled with fluid at a suitable pressure by assembling them in an atmosphere of water vapor, for example, or other suitable fluid, which fluid is maintained at the proper ambient pressure and temperature. To prevent arcing at the contacts when the pressure of the fluid is just below that value required to effect snap action of the diaphragm, one or both contacts may be resiliently mounted as on bowed springs or on cantilever springs, as illustrated in Fig. 6. The contact tips 48, 48, in Fig. 6, are mounted at one end of cantilever springs 46, 46, respectively. Said springs are attached at their opposite ends 50, 50 to an associated one of diaphragms 3'0, 30. Alternatively, the springs 46, 46 may themselves be utilized as the switch contacts.

I claim:

1. An electric switch comprising a first and a second conductive diaphragm member, each of said members having a diaphragm biased for snap action movement thereof, an insulating material interposed between a peripheral portion of said first member and a peripheral portion of said second member to form a sealed unit, a body or fiuid sealed between said members and adapted upon the attainment of a preselected pressure to effect snap action of at least one of said diaphragms from one position to another position, each of said diaphragms having a central portion for engagement with the central portion of the other in one of said positions of said diaphragms and for disengagement therefrom in the other of said positions of at least one of said diaphragms.

2. An electric switch of the character defined by claim 1 in which said insulating material comprises vitreous enamel.

3. An electric switch comprising, aconductive diaphragm member having, a diaphragm portion biased for snap action thereof in response to a pressure, a conductive member underlying said diaphragm, an insulating material interposed between said conductive member and a peripheral portion of said diaphragm member to form a sealed unit, a body of fluid disposed within y said unit, and a contactinterposed between said diaphragm and said conductive member and fastened to one of the same for effecting electrical connection therebetween.

4. An electric switch comprising, a conductive diaphragm member having a diaphragm portion biased for snap action thereof in response to a pressure, a conductive member underlyingsaid diaphragm, an insulating material interposed between said conductive memher and a peripheral portion of said diaphragm member to form a sealed unit, and a body of fluid disposed within'the said unit; said diaphragm having a central portion biased for normal engagement of said central portion with said conductive member.

5. An electric switch comprising a conductive disc member having a diaphragm portion movable with a snap action in response to a predetermined amount of pressure difference thereacross, a conductive member underlying said disc member, insulating material interposed between said conductive member and a peripheral portion of said disc member to form a sealed unit, and

a body of fluid within said unit varying the internal pressure thereof in accordance with its temperature, said diaphragm portion of said disc member having a central portion normally biased to engage said conductive member when the pressure difierence thereacross is less than said predetermined amount.

ReferencesCited in the-file of this patent UNITED STATES PATENTS

US356812A 1953-05-22 1953-05-22 Electric switch devices Expired - Lifetime US2798130A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US356812A US2798130A (en) 1953-05-22 1953-05-22 Electric switch devices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US356812A US2798130A (en) 1953-05-22 1953-05-22 Electric switch devices
GB1482954A GB766825A (en) 1953-05-22 1954-05-20 Improvements in or relating to electric switch devices responsive to fluid pressure

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US2798130A true US2798130A (en) 1957-07-02

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GB (1) GB766825A (en)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909627A (en) * 1957-12-31 1959-10-20 Bendix Aviat Corp Multiposition pressure-actuated switch
US2916586A (en) * 1955-06-17 1959-12-08 Cutler Hammer Inc Thermal switches
US2939320A (en) * 1957-10-28 1960-06-07 American Motors Corp Temperature indicating device
US3009031A (en) * 1958-12-08 1961-11-14 Bendix Corp Self-compensating pressure-sensitive capsule particularly adapted for sealed pressure switches
US3112382A (en) * 1957-10-15 1963-11-26 Standard Thompson Corp Pressure-responsive actuating device
US3233059A (en) * 1962-08-22 1966-02-01 Robertshaw Controls Co Vacuum operated electrical switch or the like
US3331040A (en) * 1963-05-13 1967-07-11 Int Standard Electric Corp Miniature diaphragm relay
US3594522A (en) * 1969-07-24 1971-07-20 Ibm Elastic diaphragm switch
US3609266A (en) * 1969-04-18 1971-09-28 Eli Raitport Snap mechanism for use with an electrical switch, valve or the like
US3743993A (en) * 1972-02-02 1973-07-03 Gen Electric Thermal overload protective device
US3905233A (en) * 1974-03-26 1975-09-16 Us Army Package penetration indicating apparatus
US3908105A (en) * 1974-05-20 1975-09-23 Tyrechek Inc Valve mounted pneumatic tire pressure sensing switch
US4066851A (en) * 1975-10-30 1978-01-03 Chomerics, Inc. Keyboard switch assembly having foldable printed circuit board, integral spacer and preformed depression-type alignment fold
FR2413772A1 (en) * 1977-12-29 1979-07-27 Bridgestone Tire Co Ltd switch sensitive to pressure
US4194105A (en) * 1977-01-13 1980-03-18 Itt Industries, Inc. Switches
EP0202711A2 (en) * 1985-05-22 1986-11-26 VELLEMAN-SWITCH, naamloze vennootschap Membrane for membrane switches and composing elements thereof
US5164558A (en) * 1991-07-05 1992-11-17 Massachusetts Institute Of Technology Micromachined threshold pressure switch and method of manufacture
EP0561572A1 (en) * 1992-03-17 1993-09-22 Morton International, Inc. Differential pressure switch
US20030034870A1 (en) * 2001-08-20 2003-02-20 Honeywell International, Inc. Snap action thermal switch
EP2194555A1 (en) 2008-12-04 2010-06-09 Abb Ag Actuator for an installation switching device
US20150064515A1 (en) * 2007-05-08 2015-03-05 Bs&B Safety Systems Limited Pressure response membrane

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US360823A (en) * 1887-04-05 Electric thermostat or fire-alarm
US1102566A (en) * 1912-01-29 1914-07-07 Lewis S Besley Thermostatic circuit-controller.
US1822408A (en) * 1927-11-28 1931-09-08 King Louise Thermally-actuated circuit-controller
GB399234A (en) * 1932-04-06 1933-10-05 Gen Electric Co Ltd Improvements in or relating to thermostats
US2127575A (en) * 1935-01-17 1938-08-23 Thompson John West Induction thermostatic device
FR876658A (en) * 1938-12-03 1942-11-12 Fides Gmbh Temperature controller
US2472625A (en) * 1944-05-23 1949-06-07 Gen Electric Electric circuit breaker
US2484932A (en) * 1946-11-29 1949-10-18 Cutler Hammer Inc Vapor pressure type thermal power element
US2562286A (en) * 1948-12-03 1951-07-31 Oswald H Milmore Temperature and pressure responsive switch
US2596171A (en) * 1949-08-03 1952-05-13 Us Army Pressure switch for fuses

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US360823A (en) * 1887-04-05 Electric thermostat or fire-alarm
US1102566A (en) * 1912-01-29 1914-07-07 Lewis S Besley Thermostatic circuit-controller.
US1822408A (en) * 1927-11-28 1931-09-08 King Louise Thermally-actuated circuit-controller
GB399234A (en) * 1932-04-06 1933-10-05 Gen Electric Co Ltd Improvements in or relating to thermostats
US2127575A (en) * 1935-01-17 1938-08-23 Thompson John West Induction thermostatic device
FR876658A (en) * 1938-12-03 1942-11-12 Fides Gmbh Temperature controller
US2472625A (en) * 1944-05-23 1949-06-07 Gen Electric Electric circuit breaker
US2484932A (en) * 1946-11-29 1949-10-18 Cutler Hammer Inc Vapor pressure type thermal power element
US2562286A (en) * 1948-12-03 1951-07-31 Oswald H Milmore Temperature and pressure responsive switch
US2596171A (en) * 1949-08-03 1952-05-13 Us Army Pressure switch for fuses

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2916586A (en) * 1955-06-17 1959-12-08 Cutler Hammer Inc Thermal switches
US3112382A (en) * 1957-10-15 1963-11-26 Standard Thompson Corp Pressure-responsive actuating device
US2939320A (en) * 1957-10-28 1960-06-07 American Motors Corp Temperature indicating device
US2909627A (en) * 1957-12-31 1959-10-20 Bendix Aviat Corp Multiposition pressure-actuated switch
US3009031A (en) * 1958-12-08 1961-11-14 Bendix Corp Self-compensating pressure-sensitive capsule particularly adapted for sealed pressure switches
US3233059A (en) * 1962-08-22 1966-02-01 Robertshaw Controls Co Vacuum operated electrical switch or the like
US3331040A (en) * 1963-05-13 1967-07-11 Int Standard Electric Corp Miniature diaphragm relay
US3609266A (en) * 1969-04-18 1971-09-28 Eli Raitport Snap mechanism for use with an electrical switch, valve or the like
US3594522A (en) * 1969-07-24 1971-07-20 Ibm Elastic diaphragm switch
US3743993A (en) * 1972-02-02 1973-07-03 Gen Electric Thermal overload protective device
US3905233A (en) * 1974-03-26 1975-09-16 Us Army Package penetration indicating apparatus
US3908105A (en) * 1974-05-20 1975-09-23 Tyrechek Inc Valve mounted pneumatic tire pressure sensing switch
US4066851A (en) * 1975-10-30 1978-01-03 Chomerics, Inc. Keyboard switch assembly having foldable printed circuit board, integral spacer and preformed depression-type alignment fold
US4194105A (en) * 1977-01-13 1980-03-18 Itt Industries, Inc. Switches
FR2413772A1 (en) * 1977-12-29 1979-07-27 Bridgestone Tire Co Ltd switch sensitive to pressure
EP0202711A2 (en) * 1985-05-22 1986-11-26 VELLEMAN-SWITCH, naamloze vennootschap Membrane for membrane switches and composing elements thereof
EP0202711A3 (en) * 1985-05-22 1989-03-01 Velleman-Switch, Naamloze Vennootschap Membrane for membrane switches and composing elements thereof
US5164558A (en) * 1991-07-05 1992-11-17 Massachusetts Institute Of Technology Micromachined threshold pressure switch and method of manufacture
EP0561572A1 (en) * 1992-03-17 1993-09-22 Morton International, Inc. Differential pressure switch
US20030034870A1 (en) * 2001-08-20 2003-02-20 Honeywell International, Inc. Snap action thermal switch
US6768412B2 (en) * 2001-08-20 2004-07-27 Honeywell International, Inc. Snap action thermal switch
US20150064515A1 (en) * 2007-05-08 2015-03-05 Bs&B Safety Systems Limited Pressure response membrane
US10388476B2 (en) * 2007-05-08 2019-08-20 Bs&B Innovations Limited Pressure response membrane
EP2194555A1 (en) 2008-12-04 2010-06-09 Abb Ag Actuator for an installation switching device

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Publication number Publication date
GB766825A (en) 1957-01-23

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