US3602850A - Contactor with improved contact support means and guide means - Google Patents

Contactor with improved contact support means and guide means Download PDF

Info

Publication number
US3602850A
US3602850A US853271A US3602850DA US3602850A US 3602850 A US3602850 A US 3602850A US 853271 A US853271 A US 853271A US 3602850D A US3602850D A US 3602850DA US 3602850 A US3602850 A US 3602850A
Authority
US
United States
Prior art keywords
contact
spring
bridging
movable
contact carrier
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
US853271A
Other languages
English (en)
Inventor
Kurt A Grunert
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Application granted granted Critical
Publication of US3602850A publication Critical patent/US3602850A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/546—Contact arrangements for contactors having bridging contacts
    • 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
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H01H9/446—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using magnetisable elements associated with the contacts
    • 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
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/46—Means for extinguishing or preventing arc between current-carrying parts using arcing horns

Definitions

  • Elchik ABSTRACT A contactor comprisesimproved contact means.
  • Spring support means comprising a contact-pressure spring and a damping spring, supports a bridging contact structure on an insulating contact carrier.
  • Externally adjustable guide means is provided to enable external adjustment of the alignment between the armature and stationary magnetic member.
  • An improved contactor comprises an insulating contact carrier comprising a tubular part.
  • An elongated bridging contact I structure whereby the contact-pressure spring operates against thesaddle member which operates against the damp ing spring to bias the bridging contact structure toward the opening of the tubular part into engagement with ledge means of the insulating contact carrier.
  • An externally adjustable guide means is provided to enable external adjustment of the alignment between the armature and the stationary magnetic member seating the pole faces for noise (audible) reduction and input power reduction.
  • FIG. 1 is a plan view of a three-pole contactor constructed in accordance with principles of this invention
  • FIG. 2 is a side sectional view taken generally along the line II-Il ofFIG. 1; 1 i
  • FIG. 3 is a perspective view, partly exploded, and with parts broken away, of the contact carrier and movable contact structures of the contactor of FIGS. 1 and 2;
  • gFIG. 4 is a side view of one of the stationary contact structures seen in FIG. 2;
  • FIG. 5 is a top plan view of the contact structure seen in FIG. 4; and :9.
  • FIG. 6 is a sectional view taken generally al ng the line VI- VI of FIG.'4.
  • a movable structure 25 is provided to cooperate with the stationary magnetic member 15 in a manner to be hereinafter described.
  • the movable structure 25 comprises an inverted generally U- shaped magnetic armature 27 and an insulating contact carrier 29 connected to the armature 27 by means of a connecting rod 31 that rests on ledges 32 of the insulating carrier 29-and passes through an opening in the armature 27.
  • the insulating contact carrier 29 is provided with a pair of openings 33 that receive the guide pins 21.
  • the guide means 21, 33 guide the movable structure 25 for rectilinear reciprocal movement.
  • the springs 23 bias the movable contact carrier 29 to thereby bias the movable structure 25 outward to the unactuated or deenergized position.
  • the contactor 5 is a threepole contactor with three bridging contact structures 35 supported on the insulating contact carrier 29 for simultaneous movement.
  • Each of the bridging contact structures 35 comprises an elongated flat conductor 37 having a pair of contacts 39 fixedly secured thereto in a spaced relationship.
  • the insulating contact carrier 29 is formed with three tubular projections 41 for carrying the three bridging contact structures
  • a pair of slots 42 (only one slot being shown in FIG. 3) is provided in each of the openings of each tubular projection 41 to provide a pair of ledges 43.
  • a separate spring generally U-shaped steel heat sink or shield member 45 (FIGS.
  • a stainless steel saddle member 55 is provided for carrying the associated bridging contact structure 35.
  • Each of the saddle members 55 is provided with a pair of bent over end portions 57 that protrude through suitable openings in a fiber disk 59 that supports one end of a coil con tact-pressure spring 61.
  • a sheet-metal damping spring 65 formed with a depression 67 at the center thereof for receiving the front end of the associated saddle 55, is provided in each pole unit.
  • each pole unit two rigid flat conductors 71 are supported on the intermediate housing member 10 by bolts 73. Solderless terminal connectors 75 are secured to the outer ends of the conductors 71 to enable connection of each pole unit in an electric circuit.
  • a separate stationary contact structure 77 is secured to the inner end of each of the conductors 71 by means of a separate bolt 79.
  • each of the stationary contact structures 77 is a three-piece unitary structure comprising a conducting support 81, a contact member 83 and an arc-runner 85.
  • the conducting support 81 is a copper member comprising an extension or mounting part having an opening 87 therein for receiving the associated mounting bolt 79 (FIG. 2).
  • the contact member 83 is a silver cadmium oxide alloy of silver tungsten alloy member that is brazed to the front of the contact support 81.
  • the are-runner 85 is an inverted generally U-shaped sheetmetal magnetic steel member having an opening 89 thereon.
  • the conducting support 81 is formed with a notch 91 (FIG. 4) therein.
  • the contact 83 comprises an overhanging part that overhangs the notch 91.
  • the arc-runner 85 extends into the notch 91 where it is fixedly brazed to the support.
  • the part of the arc-runner 85 that extends into the notch 91 is a support part and the part that extends away from the contact is an arc-runner part. As can be seen in FIG.
  • parts of the downwardly extending legs of the arc-runner 85 engage side surfaces of the support 81 to provide additional support of the arc-runner 85 on the support 81.
  • the opening 89 permits an operator to insert a screwdriver therethrough in order to removably mount the stationary contact structure 77 (FIG. 2) on the associated conductor 71 by means of the bolt 79.
  • the arc travels over the arc-runner along the edge provided at the periphery of the opening 89.
  • a plurality of slotted magnetic steel plate members 95 are supported on the insulating cover 11 in a stacked spaced relationship in proximity to each of the stationary contact structures 77 with each of the stacks 95 being supported with the slots thereof in vertical (FIG. 2) alignment and with the associated contact 39 moving within the outer ends of the aligned slots.
  • the stationary magnetic member is mounted on the aluminum base 9 by means of a rod 101 that extends through an opening in the member 15 and is secured to the base 9.
  • the coil 19 is supported on the base 9, and the guide pins 21 are screwed into tapped openings inthe base 9.
  • the springs 23 are placed over the guide pins 21.
  • the stationary contact structures 77 are secured to the associated terminal conductors 71 by means of the bolts 79 and each conductor 71, with the terminal 75 secured thereto, is secured to the intermediate housing member 10 by means of the associated bolt 73.
  • Each saddle member 55 of each movable contact structure, with the spring 61 and spring support 59 mounted thereon, is moved up through the associated opening in the insulating contact carri-' er 29 with each of the springs 61 engaging a ledge 105 of he contact carrier 29.
  • the shield members 45 are moved into position in the associated openings.
  • Each of the shield members 45 is moved down into position with the associated tangs 47 engaging the associated ledges 43 to retain each shield 45 in place.
  • each of the bridging conductors 37 is formed with a pair of notches 107 at the opposite sides thereof.
  • Each saddle member 55 is forced upward against the bias of the associated spring 61 and each of the conductors 37 is then tilted at an angle and moved into position through the opening in the associated saddle 55 and then moved so that the notches 107 receive the side legs of the associated saddle 55.
  • Each saddle 55 is forced upwardly to provide sufficient clearance or the damping spring steel member 65 to be moved into the position seen in FIG. 2 with the depressed portion 67 mating with the top portion of the associated saddle 55.
  • the associated contact pressure spring 61 will operate against the associated saddle 55 and damping spring 65 to bias the associated bridging conductor 37 downward until the bridging conductor 37 engages the associated flange portions 49 of the associated shield 45.
  • the intermediate housing member 10 With the movable structure 25 and stationary conductors 71 and stationary contact structures 77 secured to the intermediate housing member 10, the intermediate housing member 10 is moved into the position seen in FIG. 2 and secured to the housing base 9. As can be seen in FIG. 2. the openings 33 in the movable contact carrier 29 are positioned over the guide pins 21 and over the kickout coil springs 23. Thereafter, the housing cover 11, with the arc plates 95 secured thereto, is then moved into position and suitably secured to the intermediate housing member 10. The
  • center pole projection 41 of the insulating contact carrier 29 comprises a front protruding part 109 that protrudes through a suitable opening in the cover 1 l to permit manual operation of the contactor and to serve as a guide for the movable structure.
  • a metallic adjustable guide member 111 having a pair of slots therein is secured to the cover 11 by means of a pair of bolts 113 which pass through the slots and are screwed into the cover member 11.
  • the slots in the adjustable guide member 111 permit adjusting movement (left-to-right and right-to-left FIG. 2) of the member 1 11 when the screws 113 are loosened.
  • the adjustable guide member 111 comprises a planar surface that engages the side of the part 109 of the contact carrier 29 to provide a front bearing surface, and by adjusting the position of the member 111 the front bearing surface engagement between the part 109 and the member 111 is adjusted to adjust the alignment between the armature 27 and the stationary magnetic member 15.
  • the internal guide means 21, 33 guides the movable structure 25 for rectilinear reciprocal movement between the unactuated and actuated positions.
  • the contactor is mounted with the left-hand (FIG.
  • the operation of the contactor 5 will be best understood with reference to FIG. 2.
  • the contactor is shown in FIG. 2 in the deenergized or unactuated position.
  • the coil 17, which is suitably connected in a controlling circuit in a manner well known in the art, is energized to actuate the contactor.
  • the armature 27 is magnetically attracted to the stationary magnetic member 15 to thereby move the movable structure 25 downward which downward movement is guided by the guide pins 21 and the front part 109.
  • the movable structure 25 moves down against the bias of the kickout springs 23. Downward movement of the movable structure 25 closes the contacts 39, 83 for all three pole units.
  • the arcs that are drawn between each movable contact 39 and the associated stationary contact'83 are drawn magnetically toward the bight portions of the associated U-shaped magnetic steel plates 95.
  • These arcs move ofi of the stationary contact button 83 directly onto the arc-runner 85 and along the periphery of the opening 89 (FIG. of the arc-runner 85 toward the bight portions of the plates 95 where the arcs are extinguished in a manner well known in the art.
  • By positioning the magnetic steel arc-runner 85 in the slot 91 FIG.
  • the arcs move directly onto the arc-runner 85 thereby protecting the conducting support 81 and the brazed joint between the contact button 83 and the conducting support 81.
  • the opening 89 (FIG. 5) in the arc-runner 85 can receive a screwdriver type tool to facilitate removable mounting of the three-piece unitary contact structure 77 on the associated conductor 71 by means of the associated bolt or screw 79.
  • a contactor comprising a stationary magnetic member, an armature movable “toward said stationary magnetic member to an actuated position and away from said stationary magnetic member to an unactuated position, an insulating contact carrier operatively connected to said armature for movement upon movement of said armature, a pair of spaced stationary contacts, a bridging contact structure, contact support means comprising a spring support a contact-pressure spring and a damping spring, said damping spring being an elongated leaf spring, said contact-pressure spring being disposed on one side of said bridging contact structure to bias said spring support against said damping spring intermediate the ends of said damping spring to bias said damping spring on the opposite side of said bridging contact structure against position said contact carrier carrying said bridging contact structure therewith until said bridging contact structure engages said spaced stationary contacts and said contact carrier moving an additional distance as said contact pressure spring ischarged to operate through said spring support and damping spring to provide contact pressure between said bridging contact structure and said spaced stationary contacts.
  • kickout spring means biasing said armature and contact carrierto said unactuated position, said armature and contact carrier moving to said actuated position against the bias of said kickout spring means, upon movement of said armature and contact carrier to said unactuated position said armature and contact carrier moving under the bias of said contact-pressure spring and kickout spring means until said bridging contact structure is engaged by said contact carrier and thereafter said armature said contact carrier and said bridging contact structure moving to said unactuated position under the bias of said kickout spring means.
  • a contactor according to claim 2 and a metallic shield supported on said insulating contact carrier between said insulating contact carrier and said bridging contact structure to protect said insulating contact carrier from the impacts and heat of said bridging contact structure.
  • said insulating contact carrier comprising a tubular part
  • said bridging contact structure comprising an elongated bridging conductor and a pair of movable contacts supported on said elongated conductor in a spaced relationship
  • said spring support being positioned within said tubular part under said bridging conductor and ex tending along opposite sides of bridging conductor to a position over said bridging conductor
  • said contact-pressure spring comprising a coil spring positioned under said bridging conductor within said tubular part biased between a ledge portion on said tubular part and one end of said spring support, and said damping spring being positioned above said bridging conductor between said bridging conductor and the opposite end of ,said spring support whereby said coil spring biases said spring support to operate against said spring support and said damping spring to bias said bridging conductor against said contact carrier at one end of the said tubular part.
  • a contactor comprising a housing structure, a ontactormechanism supported on said housing structure,
  • said contactor-mechanism comprising a stationary magnetic member, a movable structure supported for movement relative to said stationary magnetic member, a pair of spaced stationary contacts,
  • said movement structure comprising an armature and an insulating contact carrier operatively connected to said armature, said insulating contact cam'er comprising a tubular part, a saddle support inserted into said tubular part from a first end of said tubular part, a spring support ledge in said tubular part on saidinsulating contact carrier, a coil spring supported between said spring support Y ledge and a first end of said saddle support, an elongated bridging contact structure extending across said tubular part at one end of said tubular part and extending through said saddle support, a damping spring at the opposite end of said saddle support between said opposite end of said saddle support and said bridging contact structure, said coil spring biasing said saddle support to operate through said saddle support and said damping spring to bias said bridging contact structure toward said one end of said tubular part to thereby resiliently mount said bridging con tact structure on said contact carrier,
  • conducting coil means energizable to effect movement of said movable structure from an unactuated position toward said stationary magnetic member to an actuated position, upon movement of said movable structure to said actuated position said contact carrier carrying said bridging contact structure therewith until said bridging contact structure engages said stationary contacts and thereafter said contact carrier moving an additional distance.
  • pressure spring is charged to operate through said saddle support and damping spring to provide contact pressure between said bridging contact structure and said stationary contacts.
  • kickout spring means biasing said movable structure to said unactuated position, said ,movable structure moving to said actuated position against the 'bias of said kickout spring means, upon deenergization of said coil said movable structure being movable to said unactuated position under the bias of said kickout spring means during which movement said contact carrier moves to engage said bridging contact structure and carries said bridging contact structure to said unactuated position.
  • a contactor comprising an insulating housing, a contactor structure supported in said insulating housing, said contactor structure comprising a stationary contact structure, a stationary magnetic member, a movable structure,
  • said movable structure comprising a movable contact structure cooperable with said stationary contact structure, a movable magnetic armature, an insulating contact carrier connected to move with said movable magnetic armature and carrying said movable contact structure thereon,
  • said insulating housing having an opening therein
  • said movable structure comprising a protruding part protruding through said opening
  • externally adjustable guide means comprising a guide plate and externally adjustable mounting means mounting said guide plate on said housing in proximity to said protruding part
  • said guide plate comprising a guide surface that engages said protruding part to guide movement of said protruding part of said movable structure
  • said externally adjustable mounting means permitting adjustment of said guide plate to selected adjusted stationary positions on said housing to vary the guiding action of said guide plate on said leg positioned on the outside of said housing, said mounting leg having a pair of spaced slots therein, a separate mounting screw extending through each of said slots, said mounting screws securing said mounting plate to said housing.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)
US853271A 1969-08-27 1969-08-27 Contactor with improved contact support means and guide means Expired - Lifetime US3602850A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US85327169A 1969-08-27 1969-08-27

Publications (1)

Publication Number Publication Date
US3602850A true US3602850A (en) 1971-08-31

Family

ID=25315559

Family Applications (1)

Application Number Title Priority Date Filing Date
US853271A Expired - Lifetime US3602850A (en) 1969-08-27 1969-08-27 Contactor with improved contact support means and guide means

Country Status (6)

Country Link
US (1) US3602850A (de)
CH (1) CH514931A (de)
DE (1) DE2039840A1 (de)
FR (1) FR2059196A5 (de)
GB (1) GB1275002A (de)
ZA (1) ZA705440B (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781728A (en) * 1972-10-06 1973-12-25 Westinghouse Electric Corp Electric contactor
US3815060A (en) * 1973-04-19 1974-06-04 Square D Co Electromagnetic contactor for battery powered vehicles
US3852544A (en) * 1973-09-17 1974-12-03 Westinghouse Electric Corp Fluid operated electrical contactor with contact coolant means
US4720761A (en) * 1987-02-19 1988-01-19 Westinghouse Electric Corp. Electromagnetic contactor with current regulated electromagnetic coil for holding the contacts closed
US4720763A (en) * 1987-02-19 1988-01-19 Westinghouse Electric Corp. Electromagnetic contactor with control circuit for providing acceleration, coast and grab functions
US4739293A (en) * 1987-02-19 1988-04-19 Westinghouse Electric Corp. Electromagnetic contactor with reduced noise magnetic armature
US4833565A (en) * 1987-02-19 1989-05-23 Westinghouse Electric Corp. Electromagnetic contactor with algorithm controlled closing system
US4893102A (en) * 1987-02-19 1990-01-09 Westinghouse Electric Corp. Electromagnetic contactor with energy balanced closing system
US7064638B1 (en) * 2000-07-13 2006-06-20 Mitsubishi Denki Kabushiki Kaisha Electrical switch
WO2013087097A1 (en) 2011-12-14 2013-06-20 Siemens Aktiengesellschaft Electrical switch adapted for efficient contact replacement
US20140210575A1 (en) * 2013-01-28 2014-07-31 James J. Kinsella Electrically operated branch circuit protector
US20150130566A1 (en) * 2013-11-14 2015-05-14 James K. Kinsella Means for providing improved operation properties for electrically operated circuit breakers, disconnect switches, and contactors
EP2560181A3 (de) * 2011-08-19 2015-05-27 General Electric Company Messgerätetrennrelais
US20150206684A1 (en) * 2012-12-05 2015-07-23 Fuji Electric Fa Components & Systems Co., Ltd. Electromagnetic contactor
US20160071676A1 (en) * 2013-05-24 2016-03-10 Gruner Ag Double-break relay
US11562870B2 (en) * 2018-09-07 2023-01-24 Omron Corporation Electromagnetic relay

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2732963C2 (de) * 1977-07-21 1982-10-21 Starkstrom Gummersbach GmbH, 5277 Marienheide Schütz

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781728A (en) * 1972-10-06 1973-12-25 Westinghouse Electric Corp Electric contactor
US3815060A (en) * 1973-04-19 1974-06-04 Square D Co Electromagnetic contactor for battery powered vehicles
US3852544A (en) * 1973-09-17 1974-12-03 Westinghouse Electric Corp Fluid operated electrical contactor with contact coolant means
AU594862B2 (en) * 1987-02-19 1990-03-15 Westinghouse Electric Corporation Electromagnetic contactor with reduced noise magnetic armature
US4720763A (en) * 1987-02-19 1988-01-19 Westinghouse Electric Corp. Electromagnetic contactor with control circuit for providing acceleration, coast and grab functions
US4739293A (en) * 1987-02-19 1988-04-19 Westinghouse Electric Corp. Electromagnetic contactor with reduced noise magnetic armature
US4833565A (en) * 1987-02-19 1989-05-23 Westinghouse Electric Corp. Electromagnetic contactor with algorithm controlled closing system
US4893102A (en) * 1987-02-19 1990-01-09 Westinghouse Electric Corp. Electromagnetic contactor with energy balanced closing system
US4720761A (en) * 1987-02-19 1988-01-19 Westinghouse Electric Corp. Electromagnetic contactor with current regulated electromagnetic coil for holding the contacts closed
US7064638B1 (en) * 2000-07-13 2006-06-20 Mitsubishi Denki Kabushiki Kaisha Electrical switch
EP2560181A3 (de) * 2011-08-19 2015-05-27 General Electric Company Messgerätetrennrelais
WO2013087097A1 (en) 2011-12-14 2013-06-20 Siemens Aktiengesellschaft Electrical switch adapted for efficient contact replacement
US20150206684A1 (en) * 2012-12-05 2015-07-23 Fuji Electric Fa Components & Systems Co., Ltd. Electromagnetic contactor
US9520246B2 (en) * 2012-12-05 2016-12-13 Fuji Electric Fa Components & Systems Co., Ltd. Electromagnetic contactor
US20140210575A1 (en) * 2013-01-28 2014-07-31 James J. Kinsella Electrically operated branch circuit protector
US20160071676A1 (en) * 2013-05-24 2016-03-10 Gruner Ag Double-break relay
US9704683B2 (en) * 2013-05-24 2017-07-11 Gruner Ag Double-break relay
US20150130566A1 (en) * 2013-11-14 2015-05-14 James K. Kinsella Means for providing improved operation properties for electrically operated circuit breakers, disconnect switches, and contactors
US11562870B2 (en) * 2018-09-07 2023-01-24 Omron Corporation Electromagnetic relay

Also Published As

Publication number Publication date
DE2039840A1 (de) 1971-04-22
ZA705440B (en) 1971-04-28
GB1275002A (en) 1972-05-24
FR2059196A5 (de) 1971-05-28
CH514931A (de) 1971-10-31

Similar Documents

Publication Publication Date Title
US3602850A (en) Contactor with improved contact support means and guide means
US3339161A (en) Electromagnetic contactor
US2434096A (en) Shockproof electromagnet with armature
US3815060A (en) Electromagnetic contactor for battery powered vehicles
US3740510A (en) Contactor with improved contact means
US2360744A (en) Electromagnetic operator
US4766273A (en) High current double-break electrical contactor
US3949333A (en) Auxiliary switch for electromagnetic contactor
US3419828A (en) Means proportional to magnetic flux to bias electric switch contacts closed
US3597562A (en) Movable contact structure for an electric switch
US3129304A (en) Reversible contact molded frame relay
US3796978A (en) Electromagnetic contactor with fuse block
US3643190A (en) Structure for mounting an electromagnet in an electromagnetically operated switch
US4307361A (en) Electric control apparatus with an electromechanical latch device
US3382469A (en) Electric control device and supplemental pole unit
US3214537A (en) Electrical circuit protector having auxiliary indicating switch contacts
US3735295A (en) Electric control devices with mechanical interlock
US4013989A (en) Fusible electric control device
US3655934A (en) Movable contact structure for an electric switch
US3406361A (en) Electromagnetic relay having parts retained by a one-piece spring clip which also provides armature bias
US3368171A (en) Electric control devices with mechanical interlock
US3270164A (en) Pilot light structure for electromagnetic switch
US2908784A (en) Electric control device
US3553613A (en) Magnet and movable contact support structure for a multiple contact electromagnetically actuated switch
US2231973A (en) Electromagnetically operated switch