US2547604A - Electric switch - Google Patents

Electric switch Download PDF

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Publication number
US2547604A
US2547604A US87443A US8744349A US2547604A US 2547604 A US2547604 A US 2547604A US 87443 A US87443 A US 87443A US 8744349 A US8744349 A US 8744349A US 2547604 A US2547604 A US 2547604A
Authority
US
United States
Prior art keywords
lever
switch
base
switch arm
arm
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
US87443A
Other languages
English (en)
Inventor
Sharp William
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2547604A publication Critical patent/US2547604A/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
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element

Definitions

  • a further object of the invention is the provision of means making use of the construction of a thermostatically operated catch which is held in the catch position by the spring member .forming the moving contacts.
  • a still further object of the invention is to provide means leading to a simple form of thermostatically operated catch release coacting directly with the switch arm.
  • Figure 1 is a plan of the switch body with the switch arm opened out.
  • Figure 2 is a section on line IIII of Figure 1, but showing the switch closed and showing the switch casing in broken lines.
  • Figure 3 is a side elevation of the switch body.
  • Figure 4 is a plan View of the catch on the switch arm.
  • the switch comprises a rectangular insulating base I which has three parallel channels 2 formed thereacross.
  • a spring contact blade 3 is mounted in each channel at one end and each contact blade comprises a Z-shaped ,strip of spring metal Which is fixed to the base I and has a circuit mains terminal 4 thereon for fixing thereto a lead wire of the electric supply.
  • the spring contact blade 3 is conveniently formed of Phosphor bronze.
  • the fixed contacts 5 comprise metal strips fix d inside the channels 2, one end of the strip being L-shaped to form a raised step for contacting with the spring contact blade 3.
  • One arm of an L-shaped bi-metal strip 6 is fixed under each contact strip 5 by means of the terminal screw I which fixes the contact strip 5 to the base I,
  • a heating wire 8 is coiled around an insulating sleeve 9 on the bi -metal strip, and one end of this wire 8 is connected to a circuit mains terminal Iii for a lead wire of the electric motor circuit and to the contact strip 5 by the screw 1.
  • the switch arm I I is mounted on bifurcated lugs I2 on each side of the insulating base I, and such arm has three projections I3 adapted to bear on the spring contact blades 3 and press the same on the fixed contacts 5.
  • a trip catch lever I4 is pivotally mounted on the base and comprises a U-shaped Wire member having an insulating sleeve thereon for contacting with the bi-metal strips 6.
  • the trip catch lever is normally urged inwardly towards the bi-metal strips 6 by the spring I5.
  • the switch arm has an adjustable catch projection I B which when the switch arm is being closed is adapted to bear against the roller on the trip catch lever and press it rearwardly so that the trip catch lever will engage over the projection I and hold the switch arm in the on position.
  • the base I is mounted in a box I!
  • the trip catch lever can also be moved by the bi-meal st i s. If the bi-metal strip is overheated it is deflected against the trip catch lever I l and moves the same from the projection, thereby throwin the switch ooen. By adjusting the projection IS, the particular condition when the switch will automatically open can be varied.
  • a stop lever 2! is pivoted on the base I and. connected by the helical spring 22 to the trip catch lever I4.
  • the trip catch lever I 4 When therefore the trip catch lever I 4 is moved by the bi-metal strips, the lever 2i will be pivoted therewith to lie in the path of a projection 23 on the arm I I, th reby prev nting such arm being depressed.
  • the spring 22 forms an expansible link and permits the catch lever I4 to be moved to engage over the projection l6 whilst the projection 23 lies in front of the lever 2
  • the coils of the spring are norma ly closed to form a solid link to push the lever 2I rearwardly by the spring pressure of the lever I-I.
  • An electric switch comprising an insulating base, a plurality of fixed contacts on the base, each fixed contact being electrically connected to a circuit mains terminal, a plurality of movable contacts mounted on the base and each comprising a blade spring forming an arm flexibly connected at one end to said base, each blade aseaeoa spring forming an electric conductor and bein electrically connected to another circuit mains termi al, a s itc a m ni otallv mounted on said base and ro i ed with roiect ons da ed to bear against said arms of the m able contacts and to de r ss the said. movabl contacts into contact with the said fi ed contacts.
  • said movable contacts b in adapted to be ur ed. to open osition hv the spr ng n s re of the sai mov bl conta ts on said r j ctions.
  • a tri lever compriing a transve se bar having le s at each side which are nivot llv mo nted on said base a catch proj ction on t e pivoted switch, arm which is engage b the trio lever and held in en a ement by said b ade sp ings, bi-metal strips which lie in front of sa d transverse bar and which when deflected pivot the trip lever to release said switch arm when an overcurrent passes through one or more of the bi-metal strips, a first press button adapt d to bear on said switch arm to thereby move said catch proection into engagement with the trip le er. and a second press b tton adapted to bear against and operate the trip lever to release the switch arm.
  • An electric switch com rising an insulating base, a plurality of fixed contacts on said base, each fixed contact being electrically connected to a circuit mains terminal, a plurality of movable contacts mounted on the base and each movable contact comprising a Z-shaped blade spring having a straight arm and a double-bend at its inner end for connection to the base and forming an electric conductor and electrically connected to another circuit mains terminal, a switch arm pivotally mounted on said base and provided with projections adapted to bear against said arms of said movable contacts and to depress said movable contacts into engagement with said fixed contacts and by flexing said straight arms inwardly between said fixed contacts and the double-bend at the fixed ends of the blade springs and to be urged in the open position by the spring pressure of said movable contacts on said switch arm projections, a trip lever comprising a transverse bar arranged parallel to the axis of said switch arm and having legs at each side which are pivotally mounted on said base, a catch projection on the pivoted switch arm which is
  • An electric switch comprising an insulating base, a plurality of fixed contacts on the base, each fixed contact being electrically connected to one circuit mains terminal, a plurality of movable contacts mounted on the base, each movable contact comprising a blade s ring shaped to form a straight arm and a double-bend at its inner end for connection to the base and forming an electric conductor connected to another circuit mains terminal, a switch arm pivotally mounted on said base and provided with projections adapted to bear against said straight arms of said movable contacts and to depress said movable contacts into contact with said fixed contacts and by flexing the straight arms inwardly between the fixed contacts and the double-bend at the fixed ends of the spring blades and to be urged in the open position by the spring pressure of said blade springs of the movable contacts on said projections, a trip lever comprising a transverse bar'arranged substantially parallel to the axis of said switch arm and having lugs at each side which are pivotally mounted on said base, a catch projection on the pi

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
US87443A 1948-05-04 1949-04-14 Electric switch Expired - Lifetime US2547604A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB12175/48A GB651883A (en) 1948-05-04 1948-05-04 Improvements in thermally tripped electric switches

Publications (1)

Publication Number Publication Date
US2547604A true US2547604A (en) 1951-04-03

Family

ID=9999712

Family Applications (1)

Application Number Title Priority Date Filing Date
US87443A Expired - Lifetime US2547604A (en) 1948-05-04 1949-04-14 Electric switch

Country Status (3)

Country Link
US (1) US2547604A (pt)
BE (1) BE488162A (pt)
GB (1) GB651883A (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713623A (en) * 1952-07-18 1955-07-19 Telemecanique Electrique Thermally operated protective devices for polyphase currents

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1215665A (en) * 1915-04-05 1917-02-13 Heinrich Landis Spring arrangement especially for contact devices.
US1893827A (en) * 1930-01-15 1933-01-10 Trumbull Electric Mfg Co Electric switch
US2013013A (en) * 1934-07-16 1935-09-03 Square D Co Automatic starter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1215665A (en) * 1915-04-05 1917-02-13 Heinrich Landis Spring arrangement especially for contact devices.
US1893827A (en) * 1930-01-15 1933-01-10 Trumbull Electric Mfg Co Electric switch
US2013013A (en) * 1934-07-16 1935-09-03 Square D Co Automatic starter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713623A (en) * 1952-07-18 1955-07-19 Telemecanique Electrique Thermally operated protective devices for polyphase currents

Also Published As

Publication number Publication date
BE488162A (pt)
GB651883A (en) 1951-04-11

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