US2533571A - Rocker-arm snap switch - Google Patents

Rocker-arm snap switch Download PDF

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Publication number
US2533571A
US2533571A US632155A US63215545A US2533571A US 2533571 A US2533571 A US 2533571A US 632155 A US632155 A US 632155A US 63215545 A US63215545 A US 63215545A US 2533571 A US2533571 A US 2533571A
Authority
US
United States
Prior art keywords
switch
plunger
arm
fixed contacts
fixed
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
US632155A
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English (en)
Inventor
Fuke Francis Cecil
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.)
British Mechanical Productions Ltd
Original Assignee
British Mechanical Productions Ltd
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
Application filed by British Mechanical Productions Ltd filed Critical British Mechanical Productions Ltd
Application granted granted Critical
Publication of US2533571A publication Critical patent/US2533571A/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
    • H01H15/00—Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
    • H01H15/02—Details
    • H01H15/06—Movable parts; Contacts mounted thereon
    • H01H15/16—Driving mechanisms
    • H01H15/18—Driving mechanisms acting with snap action
    • 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
    • H01H13/12—Movable parts; Contacts mounted thereon
    • 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

Definitions

  • This 'invention'rel'ates to electric 'switchesand is particularly (but not exclusively) concerned with switches of the micro-break type for the control of "alternating current.
  • the present invention is concerned'with an el'ectric switch comprising in combination with two fixed contacts with a gap between them, a switch" operating member movable to and fro "between twolim-iting positions, and a movable contact element in the "from of a rocking arm,
  • one-end ofwhioh ' (hereinafter referred to asthe 'outer'e'nd) has a floating bearing in a troughlike housing or journal provided in part by one of the 'fi-Xed contacts and in part by the other "fixed contact, and theother endo'f which '(here- “inafter referred to as the inner end) is so carried “by the "operating member that on movement-of said member between one limiting position and theother, the arm willbe rockedabout its outer end through a dead centre across the gapbe'tween'the two fixed contacts, the arrangement being such that inorre'li miting position of the operating member the outerend of the "arm abuts on both fixed contacts and. in the "otherlimiting positi'on' i-tabuts ononly one fixed contact.
  • The'ro'cking arm may be spring-controlled to provide a snap-actionbetween the limiting posi-
  • the switch operating member is a slide, elg. in the form of "a In 'order-to provide a snap-action the two arms mayfbe controlled by independent springs, or'a singlecontrol' springmay be employed.
  • Figures 2 and 3 are elevations, similar to'Fi'gure 1, showing successive positions assumed by the operating parts when the switch is'mov'ed from on to off;
  • Figure 4 is a plan of the switch shown in Figures l to 3, the left half of the Figure being in section;
  • Figure 5 is a partial elevation showing a modified. arrangement of spring control
  • Figure 6 is a partial elevation showing a, modification providing a single-pole :single throw switch
  • Figure 7 is an elevation of a switch mocha nism embodying a further example
  • Figure 8 is a view (similar to Figure 7 showing a modification providing an intermediate control switch.
  • the switch which is of doublapole single-throw pattern, comprises a rectangular base 253 of insu'lating material having at opposite sides .integral arcuate flanges 2! in which are formed D-shaped holes in alignment for accepting a movable operating plunger 22 of a corresponding cross-section.
  • the fixed contacts 23, 2- 3 are rigidly secured to "the insulating base 29 by screws 25 and each contact i-s'prov'ide'd with a hole El and e.
  • terminarscrew 2 8 forsecuring'the ends of the cable of the circuit to be controlled.
  • the base 25 is provided with a pair of slightly elongated counter-bored holes 29 for accepting the screws for fastening the switch to a wall or other support. Adjacent the elongated fixing holes 29ers .threaded holes for co-operating with screws at by which a domed cover 3! is secured in position between :the base'flanges 2E after the switch has been connected 11p and secured to the wall surface.
  • TheiCOVE! :31, 'whenin' position, completely encloses the electrical conductors and contacts within the switch base.
  • ' 'Iheoperating-plunger'22 for convenience in assernbly, isin two parts which are secured toto gether 'interme'diate inthe length of the plunger as-a whole by a screwlEZ, in the region of which a compartment is formed within'the-plunger for accepting and housing a pairof locating pins 33, two tors-ion springs 34 associated therewith, and the inner ends of two rocking arms 35 which together constitute the movable contact member of the double-pole switch.
  • the fixing screw 32 which connects the two plunger parts together has a plain shank extending beyond its threaded portion so as to engage with a slot 33 in the base 20. The length of the base slot 33 thus limits the movement of the operating plunger 22 in each direction.
  • each rocking arm 35 is of ball or roller shape and has a floating engagement with a trough-like bearing provided in the region of the air gap 25 between the two co-operating fixed contacts 23, 24 and provided in part by one fixed contact 23 and in part by the other fixed contact 24 and the tongue 24a projecting therefrom which closely approaches contact 23.
  • Each torsion spring 34 has an eye which engages over the corresponding locating pin 33 and two arms splayed apart at an acute angle, one being a short arm 31 and the other a long arm 38.
  • the short arms 3'! of the torsion springs are pivotally articulated to the inner ends of the rocking arms 35.
  • the long arms 33 of the torsion springs which are located on opposite sides respectively of the plunger fixing screw 32, bear on the opposite end walls of the intermediate plunger compartment.
  • each rocking arm 35 will turn about an axis coincident with the centre of the ballor roller-shaped portion at the outer end of the arm, and while doing so the outer end of the arm will make effective rubbing contact against both its co-operating fixed contacts 23, 24.
  • a position is eventually reached when each rocking arm 35 passes ⁇ a dead centre position (shown in Figure 2) with the result that the spring reactions automatically continue the upward movement of the plunger and, at the same time, force the rocking arms 35 downwardly and outwardly into positions (shown in Figure 3) in which the outer end of each arm bears only on the co-operating fixed contact 24.
  • each rocking arm is in the form of a rotatable roller 42 which on movement of the switch between the on and off positions makes rolling contact with the surfaces of the co-operating fixed contacts.
  • the rocking arms are controlled by U-shaped springs 43.
  • FIG 8 the switch illustrated is a modified form of that shown in Figure '7, the modification being for the purpose of providing a socalled intermediate control switch.
  • the two pairs of main fixed contacts 23, 24 are retained and in association with each pair there is furnished a third or auxiliary fixed contact 50.
  • the location of each auxiliary fixed contact is such that in one position of the corresponding rocking arm 35 it electrically connects the auxiliary contact 50 with the fixed contact 23 and in the other position (shown in Figure 8) it electrically connects the two main fixed contacts 23, 24.
  • the auxiliary fixed contacts 50 are cross-connected at the back of the switch with main fixed contacts on opposite sides of the operating plunger 22.
  • An electric snap-action switch comprising a base, two contacts fixed to the base with a gap between them, a switch operatin Plunger movable in a rectilinear path between two limiting positions in guides provided on the base, a movable contact element in the form of a rocking arm one end of which has a floating bearing in a housing provided in part by one of the fixed contacts and in part by the other fixed'contact and a torsion spring carried by the plunger for bodily movement therewith having a coiled eye with two arms extending therefrom, the eye fitting over a locating pin in the plunger with one spring arm attached to the other end of the mov able element and the other spring arm engaging a reaction surface on the plunger, the arrangement being such that on initial movement of the plunger from one limiting position towards the other limiting position the element will be rocked about the bearing end aforesaid and the spring will be loaded until a dead-centre position of the element is reached and passed when the movement of the plunger to the other

Landscapes

  • Push-Button Switches (AREA)
  • Tumbler Switches (AREA)
US632155A 1944-05-30 1945-12-01 Rocker-arm snap switch Expired - Lifetime US2533571A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10416/44A GB577126A (en) 1944-05-30 1944-05-30 Improvements in or relating to snap-action electric switches

Publications (1)

Publication Number Publication Date
US2533571A true US2533571A (en) 1950-12-12

Family

ID=9967419

Family Applications (1)

Application Number Title Priority Date Filing Date
US632155A Expired - Lifetime US2533571A (en) 1944-05-30 1945-12-01 Rocker-arm snap switch

Country Status (5)

Country Link
US (1) US2533571A (enrdf_load_stackoverflow)
BE (1) BE459534A (enrdf_load_stackoverflow)
FR (1) FR913304A (enrdf_load_stackoverflow)
GB (1) GB577126A (enrdf_load_stackoverflow)
NL (1) NL122609C (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO782144L (no) * 1978-06-19 1979-12-20 Hans Chr Mengshoel Knelemoebel.

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1210658A (en) * 1912-08-26 1917-01-02 Cutler Hammer Mfg Co Electric switch.
US1256332A (en) * 1914-05-05 1918-02-12 Krantz Mfg Company Inc Switch mechanism.
US1392332A (en) * 1919-10-07 1921-10-04 Cons Car Heating Co Electric switch
US1606121A (en) * 1924-10-27 1926-11-09 Jr John B Gury Electric switch
US1645528A (en) * 1926-02-15 1927-10-18 Economy Fuse And Mfg Company Electric switch
US1682211A (en) * 1928-08-28 Joseph w
US1882857A (en) * 1931-04-10 1932-10-18 Cutler Hammer Inc Electric switch
US1971212A (en) * 1931-05-18 1934-08-21 Gen Electric Electric snap switch
US2098077A (en) * 1934-08-08 1937-11-02 Hoover Co Electric switch
US2144741A (en) * 1935-12-10 1939-01-24 Marx & Co Louis Overload circuit breaker
US2472333A (en) * 1945-06-04 1949-06-07 Everard F Kohl Snap acting electric switch

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1682211A (en) * 1928-08-28 Joseph w
US1210658A (en) * 1912-08-26 1917-01-02 Cutler Hammer Mfg Co Electric switch.
US1256332A (en) * 1914-05-05 1918-02-12 Krantz Mfg Company Inc Switch mechanism.
US1392332A (en) * 1919-10-07 1921-10-04 Cons Car Heating Co Electric switch
US1606121A (en) * 1924-10-27 1926-11-09 Jr John B Gury Electric switch
US1645528A (en) * 1926-02-15 1927-10-18 Economy Fuse And Mfg Company Electric switch
US1882857A (en) * 1931-04-10 1932-10-18 Cutler Hammer Inc Electric switch
US1971212A (en) * 1931-05-18 1934-08-21 Gen Electric Electric snap switch
US2098077A (en) * 1934-08-08 1937-11-02 Hoover Co Electric switch
US2144741A (en) * 1935-12-10 1939-01-24 Marx & Co Louis Overload circuit breaker
US2472333A (en) * 1945-06-04 1949-06-07 Everard F Kohl Snap acting electric switch

Also Published As

Publication number Publication date
FR913304A (fr) 1946-09-04
BE459534A (enrdf_load_stackoverflow)
NL122609C (enrdf_load_stackoverflow)
GB577126A (en) 1946-05-06

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