US2444529A - Electrical switch - Google Patents

Electrical switch Download PDF

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Publication number
US2444529A
US2444529A US739428A US73942847A US2444529A US 2444529 A US2444529 A US 2444529A US 739428 A US739428 A US 739428A US 73942847 A US73942847 A US 73942847A US 2444529 A US2444529 A US 2444529A
Authority
US
United States
Prior art keywords
spring
section
length
contact
bowed
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
US739428A
Other languages
English (en)
Inventor
Louis M Puster
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 Controls Co
Original Assignee
Robertshaw Fulton Controls 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 FR963862D priority Critical patent/FR963862A/fr
Application filed by Robertshaw Fulton Controls Co filed Critical Robertshaw Fulton Controls Co
Priority to US739428A priority patent/US2444529A/en
Application granted granted Critical
Publication of US2444529A publication Critical patent/US2444529A/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
    • 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
    • H01H13/26—Snap-action arrangements depending upon deformation of elastic members
    • H01H13/36—Snap-action arrangements depending upon deformation of elastic members using flexing of blade springs
    • 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

  • This invention relates to electrical switches, and more particularly to electrical switches of the snap action type.
  • Another object of this invention is to provide an improved snap action electrical switch wherein the actuating member may be moved through a predetermined distance without initiating the snap action.
  • Another object of this invention is to provide an improved snap action electrical switch of the type last characterized wherein the snap action is independent of the speed with which the actuating means is moved.
  • Another object of an improved snap action electrical switch wherein the initial movement of the actuating means tends to urge the electrical contacts together with increased pressure up to the instant the snap action becomesefiective to separate the contacts abruptly.
  • Another object of this invention is to provide an improved snap action electrical switch which is composed of a minimum number of easily fabricated parts so that it is inexpensive to produce.
  • Another object of this invention is to provide an improved snap action electrical switch which may be readily adjusted to predetermine the characteristics of the snap action.
  • Fig. 1 is a perspective elevation of an embodiment of the present invention
  • Fig. 2 is an enlarged cross section on the line 22 of Fig. 1;
  • Figs. 3 and 4 are views corresponding to Fig. 2 but illustrating the position of the parts at different times during the movement of the actuating means; and a Fig. 5 is a cross section on the line 65 of Fig. 2.
  • this invention is toprovide- I her I it and cover it 20 and thereby
  • the parts of the switch are shown as enclosed within a housing of any suitable size, configuration and material, illustrated as comprising a. body memof insulating material providing therein a switch chamber l2.
  • Cover i I may be permanently secured to the body member it] after the parts are assembled, although if preferred provision may be made for rendering the cover detachable from the body member to gain access to the parts of the switch.
  • Mounted be-. tween said fulcrum projections it and i5 is an elongated leaf spring it of any suitable width, the apicesof said projections engaging the opposite faces of said spring at approximately the midpoint of its length. At its extremities said spring is received in the approximately v-shaped or U- shaped recesses ill and it of a pair of depending brackets is and 20 secured in any suitable way to the cover i l as by rivets 2
  • Leaf spring it has a length such as to be somewhat longer than the length between the bottoms of the recesses l1 and it so that when said spring is supported at its ends in said recesses it must assume a bowed configuration and then, when the cover is installed on the body member so that the aligned apices of the projections It and i5 engages said spring midway of its length as shown in Fig. 2,
  • said spring is forced to assume a somewhat sinusoidal form, that is, with one half of the spring bowed upwardly, as shown at '22 in Fig. 2, and the other half bowed downwardly, as shown at 23 in Fig. 2.
  • a movable contact member of any suitable construction here shown as in the form of an inverted U-shaped block 26 of any suitable insulating material (see Fig. attached to the spring IS in any suitable way, as by one or more rivets 21, and having its downwardly extending extremities 28 and 29 bridged by a metal piece 30 with further insulation 3
  • contact member 26 is provided with one or more suitable contact elements, shown as a pair of studs 32 and 33 retained in the member 25 in any suitable way and having below the bridge piece 30 contact heads 34 provided with contact surfaces 35.
  • Suitable opposed stationary contact elements shown as contacts 36 and 31 provided with contact faces 38 in alignment with contact faces 35.
  • Each of said stationary contacts 36 and 31 is shown as mounted on a metallic plate 33 suitable way, as by a screw 40 engaging threads on a tubular conducting element 4
  • a contact screw 42 similarly engaged with said tubular conducting element 41 may be used to secure any suitable electrical conductor 43 in conductive relationship with the tubular member 4
  • Any other suitable provision for connecting the contact elements with any suitable conduc'tors may be used if preferred.
  • a thrust member 44 which may be opera-ted manually or by any suitable automatic mechanism, is reciprocatingly mounted in an aperture 45 of the cover and has its inner extremity 46 normally engaged with the section 22 of .the spring l6 approximately midway of its length.
  • thrust member 44 carries a depending inverted U -shaped bracket 41, and the downwardly extending legs of said bracket 41 carry a cup-shaped spring retainer 48 that is reciprocatingly mounted in a recess 49 in the body member Ill.
  • a coil spring 50 mounted in said recess 49 between the bottom of said recess and said cupshaped spring retainer 48 is a coil spring 50.
  • Cupshaped spring retainer 48 also has-secured thereto an upwardly extending post 5
  • the parts of the switch are normally in the relative position shown in Fig. 2 with the downwardly bowed section 23 of spring l6 holding the movable contact member 26 in such position that contacts 34, 34 are firmly engaged with the stationary contacts 36 and 31.
  • the upwardly bowed section 22 of spring I6 is in engagement with the inner end of the thrust member 44 but slightly spaced from the upper ehd of the post 54 Assuming that the thrust member 44 is to be manually actuated, thrust member 44 is pushed inwardly when it is desired to open the switch.
  • the first inward movement of thrust member 44 merely secured to the body member I0 in any 4 flattens the section 22 of spring It as shown in Fig.
  • the spring retainer 48 is stopped at such a predetermined point as is necessary to bring the part 22 of spring ii to rest upon the end surface of the post 5
  • this shoulder 52 is a means of stopping the spring retainer 48 at that predetermined point which is necessary to bring the part 22 of spring 15 to rest upon the end of the post 5i so as to render the return force mechanism, including spring 50, retainer 48 and post 5!, capable of instantaneous action the moment pressure is released from thrust member 44.
  • thrust member 64 is being moved inwardly to the.
  • a snap action electrical switch in combination with a housing providing a switch chamber, a leaf spring in said chamber, means mountsaid bowed spring sections, at least one stationary contact element carried by said housing for cooperation with said movable contact element, and means cooperating with the other of said bowed spring sections approximately midway of its length for reversing the direction of curvature of said last'named section and thereby the direction of curvature of said first named section to .move said contact elements with respect to each other.
  • a snap action electrical switch in combination with a housing providing a switch chamber, a leaf spring in said chamber, means mounting said leaf spring at its ends, opposed fulcrum member engaging said leaf spring approximately midway of its ,length, the length of said spring being greater than the distance between said mounting means whereby with the cooperation of said fulcrum members said spring 'is' bowed in opposite directions on opposite sides of said fulcrummembers, at least one movable contact element mounted approximately midway of one of said bowed spring sections, at least one stationary contact element carried by said housing for cooperation with said movable contact element, means cooperating with the other of said bowed spring sections approximately midway of its length for reversing the direction of curvature of said last named section and thereby the direction oi. curvature of said first named section to move said contact elements with respect to each other, and means for adjusting the extent of curvature of said leaf spring.
  • a snap action electrical switch in combination with a housing providing a switch chamber, a leaf spring in said chamber, means mounting said leaf spring at its ends, opposed fulcrum members engaging said leaf spring approximately midway of its length, the length of said spring being greater than the distance between said mounting means whereby with the cooperation of said fulcrum members said spring is bowed in opposite directions on opposite sides of said fulcrum members, at least one movable contact element mounted approximately midway of one of said bowed spring sections, at least one stationary contact element carried by said housing for cooperation with said movable contact element, means cooperating with the other of said bowed spring sections approximately midway of its length for reversing the direction of curvature of said last named section and thereby the direction of curvature of said first named section to move said contact elements with respect to each other, and spring means tensioned by the reversal of curvature of said leaf spring for returning said spring to its original curvature when pressure is released on said second named spring section.
  • a snap action electrical switch in combination with a housing providing a switch chamber, a leaf spring in said chamber, brackets provided with recesses in which the ends of said spring are mounted, opposed fulcrum members engaging the opposite faces of said spring approximately midway of its length, said spring being of greater length than the distance between and thrust means cooperating with other of said spring sections approximately midway of its length and adapted to reverse the direction of therewith.
  • a snap action electrical switch incombination with a housing providing a switch chamber, a leaf spring in said chamber, brackets provided with recesses in which the ends of said spring are mounted, opposed fulcrum members engaging the opposite facesof said spring approximately midway of its length, said sprin being of greater length than the distance between.
  • a snap action electrical switch in combination with a housing providing a switch chamber, a leaf spring in said chamber, brackets provided with recesses in which the ends of said spring are mounted, opposed fulcrum members engaging the opposite faces of said spring approximately midway of its length, said spring being or greater length'than the distance between the bottoms of the recesses in said brackets whereby with the cooperation of said fulcrum members the sections of said spring at opposite sides of said fulcrum members are bowed in opposite directions, a movable contact member mounted on said spring approximately midway of the length of one of said bowed sections, stationary contact means carried by said housing for cooperation with said movable contact member, thrust means cooperating with other of said spring sections approximately midway of its length and adapted to reverse the direction of curvature thereof to thereby reverse the direction of curvature of the first spring section and move the movable, contact member abruptly with respect to the stationary contact means when said thrust member has moved a predetermined distance to flatten the spring section associated therewith, and a spring tensione
  • a snap action electrical switch in combination with a housing providing a switch chamber, a leaf spring in said chamber, means providing recesses in which the ends of said spring are mounted, the distance between the bottoms of said recesses being less than the length of said spring, opposed fulcrum members carried by the opposite walls of said chamber and engaging said spring approximately midway of its length at opposite faces thereof whereby the sections of said spring at opposite sides of said fulcrum membars are bowed in opposite directions, a movable contact member carried by one of said sections approximately midway of its length, stationary contact means carried by the wall of said chamber in position for cooperation with said movable contact member, a.
  • thrust member extending to the exterior of said housing and extending interiorly of said chamber intoposition for cooperation with the other of said spring sections approximately midway of its length, a member aligned with said thrust member and adapted to be engaged by said last named spring section when said thrust member is actuated to flatten said section, and a spring cooperating with said last named member and tensioned when the curvature of said second spring section is reversed by operation of said thrust member, reversal of curvature of said second spring section effecting reversal of curvature of said first spring section to move said movable contact member abruptly relatively to said stationary contact means and said second named spring automatically restoring the curvature of said spring sections when pressure is released on said thrust member.

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  • Push-Button Switches (AREA)
US739428A 1947-04-04 1947-04-04 Electrical switch Expired - Lifetime US2444529A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR963862D FR963862A (enrdf_load_stackoverflow) 1947-04-04
US739428A US2444529A (en) 1947-04-04 1947-04-04 Electrical switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US739428A US2444529A (en) 1947-04-04 1947-04-04 Electrical switch

Publications (1)

Publication Number Publication Date
US2444529A true US2444529A (en) 1948-07-06

Family

ID=24972264

Family Applications (1)

Application Number Title Priority Date Filing Date
US739428A Expired - Lifetime US2444529A (en) 1947-04-04 1947-04-04 Electrical switch

Country Status (2)

Country Link
US (1) US2444529A (enrdf_load_stackoverflow)
FR (1) FR963862A (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539185A (en) * 1951-01-23 Thermal motor
US2599437A (en) * 1948-09-24 1952-06-03 Chrysler Corp Switch
US2660633A (en) * 1951-01-04 1953-11-24 Chicago Telephone Supply Corp Snap switch
US2790869A (en) * 1953-08-17 1957-04-30 Furnas Electric Co Manually resettable pressure actuated switch
US2825779A (en) * 1956-01-10 1958-03-04 Electrical Apparatus Company I Snap switch
US2845504A (en) * 1954-10-14 1958-07-29 Westinghouse Electric Corp Snap acting electrical switch
US2849558A (en) * 1954-09-16 1958-08-26 Clarostat Mfg Co Inc Switch
US2854540A (en) * 1957-08-15 1958-09-30 Lewis L Cunningham Electric switch
US2971069A (en) * 1958-08-04 1961-02-07 Robertshaw Fulton Controls Co Switch
US2999138A (en) * 1959-10-19 1961-09-05 Cherry Electrical Prod Tease-proof snap-action switch
DE1118310B (de) * 1960-01-29 1961-11-30 Olympia Werke Ag Elektrischer Mikroschnappschalter
US3032623A (en) * 1959-10-19 1962-05-01 Cherry Electrical Prod Snap-action switch
US3898402A (en) * 1973-08-27 1975-08-05 Airpax Electronics Snap switch with actuating tongue
FR2400249A1 (fr) * 1977-08-11 1979-03-09 Itt Interrupteur electrique a action instantanee
FR2438545A1 (fr) * 1978-10-11 1980-05-09 Scm Corp Mecanisme de touche a effet de declic
FR2468196A1 (fr) * 1979-10-16 1981-04-30 Itt Interrupteur electrique a action rapide
US4808778A (en) * 1985-06-26 1989-02-28 Jimbo Electric Co., Ltd. Switching apparatus having a rocking element

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539185A (en) * 1951-01-23 Thermal motor
US2599437A (en) * 1948-09-24 1952-06-03 Chrysler Corp Switch
US2660633A (en) * 1951-01-04 1953-11-24 Chicago Telephone Supply Corp Snap switch
US2790869A (en) * 1953-08-17 1957-04-30 Furnas Electric Co Manually resettable pressure actuated switch
US2849558A (en) * 1954-09-16 1958-08-26 Clarostat Mfg Co Inc Switch
US2845504A (en) * 1954-10-14 1958-07-29 Westinghouse Electric Corp Snap acting electrical switch
US2825779A (en) * 1956-01-10 1958-03-04 Electrical Apparatus Company I Snap switch
US2854540A (en) * 1957-08-15 1958-09-30 Lewis L Cunningham Electric switch
US2971069A (en) * 1958-08-04 1961-02-07 Robertshaw Fulton Controls Co Switch
US2999138A (en) * 1959-10-19 1961-09-05 Cherry Electrical Prod Tease-proof snap-action switch
US3032623A (en) * 1959-10-19 1962-05-01 Cherry Electrical Prod Snap-action switch
DE1118310B (de) * 1960-01-29 1961-11-30 Olympia Werke Ag Elektrischer Mikroschnappschalter
US3898402A (en) * 1973-08-27 1975-08-05 Airpax Electronics Snap switch with actuating tongue
FR2400249A1 (fr) * 1977-08-11 1979-03-09 Itt Interrupteur electrique a action instantanee
FR2438545A1 (fr) * 1978-10-11 1980-05-09 Scm Corp Mecanisme de touche a effet de declic
US4269521A (en) * 1978-10-11 1981-05-26 Scm Corporation Key mechanism having a snap action
FR2468196A1 (fr) * 1979-10-16 1981-04-30 Itt Interrupteur electrique a action rapide
US4336429A (en) * 1979-10-16 1982-06-22 Itt Industries, Inc. Switch unit
US4808778A (en) * 1985-06-26 1989-02-28 Jimbo Electric Co., Ltd. Switching apparatus having a rocking element

Also Published As

Publication number Publication date
FR963862A (enrdf_load_stackoverflow) 1950-07-24

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