US3898407A - Movable contact-stem operator for a vacuum-type circuit-interrupter - Google Patents

Movable contact-stem operator for a vacuum-type circuit-interrupter Download PDF

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Publication number
US3898407A
US3898407A US481423A US48142374A US3898407A US 3898407 A US3898407 A US 3898407A US 481423 A US481423 A US 481423A US 48142374 A US48142374 A US 48142374A US 3898407 A US3898407 A US 3898407A
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Prior art keywords
contact
movable
operator
stem
bolt
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Expired - Lifetime
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US481423A
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English (en)
Inventor
Alfred W Hodgson
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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Priority to US481423A priority Critical patent/US3898407A/en
Priority to CA228,892A priority patent/CA1036648A/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/022—Details particular to three-phase circuit breakers

Definitions

  • the movable-contactstem operator has at least one pivot-aperture provided therethrough, which accommodates the contactoperator pivot pin, and upon suitable alignment with a pivotally mounted contact-operating lever, may, as a subsequent procedural operation, have the clamping bolt tightened upon the contact-stem operator, so that thereafter the operating motion is: transmitted directly between the contact-operatorand-the movable contact stem without any torque, .o r rotational motion being transmitted to the usuallyprovided metallic sylphon bellows which maintains the evacuated condition within the vacuum circuit-interrupter envelope.
  • an accurately-machined lower supportflange plate member in this particular instance comprising a generally U-shapcd accurately-machined support-plate, with the two leg portions thereof providing aligned pivot-apertures, which accommodate the pivotally-mounted support pin, which serves as a fixed pivotal support for the rotatable movable contact arm of the circuit-interrupter mechanism.
  • Vacuum-type circuit-interrupters have been extensively utilized in industrial switchgear for controlling feeder circuits, and for controlling. for example, electrical motors of various ratings.
  • air-break interrupter units control electrical motors
  • vacuum-type circuit-interrupter units When vacuum-type circuit-interrupter units are utilized in place of air-break interrupting units, invariably a metallic sylphon bellows is utilized to hermetically maintain the evacuated condition within the vacuumtype circuit-interrupter envelope. It is desirable not to impose any torsional, or rotational stress upon this sylphon bellows, which is manufactured for strictly linear straight-line motion. Also, the operational life of such a vacuum-type circuit-interrupter unit may approach one million operations, for example, so that it is necessary to prevent the imposition of torsional, or rotational stress upon the metallic bellows associated with the movable-contact stem of the vacuum circuitinterrupter unit.
  • a loosely fitting movable-stem operator is provided, being associated with a suitable affixment means, such as a shoulderbolt, for example.
  • a suitable affixment means such as a shoulderbolt, for example.
  • the rotatable contact-actuating levers may be placed into the proper operating position, with the contact-operator loosely fitting upon the contact stem, and, consequently, not imposing any torsional stress upon the stem, or ultimately upon the metallic sylphon bellows of the vacuum circuit-interrupter unit.
  • an accurately-machined lower support-flange plate is provided, the latter having accurately-located pivot apertures for the pivot pin to support, in a pivotal manner, the contacting-actuating lever.
  • the contact-actuating lever is mechanically linked to a suitable operating mechanism.
  • FIG. I is a perspective view of motor-starter equipment including two motor starters disposed in superimposed relation together with their disconnecting-switch structures;
  • FIG. 2 is a side-elevational view of the right side of the truck-mounted contactor, or interrupter assembly of the instant invention:
  • FIG. 3 is a front elevational view looking at the front of the truck-mounted vacuum-type circuit-interrupter assembly of the present invention
  • FIG. 4 is a vertical sectional view taken substantially along the line IVIV of FIG. 3 with the separablecontaet structure closed;
  • FIG. 5 is an enlarged detailed view of the operating linkage and mechanism structure of FIG. 4, again the separable contacts of the vacuum-type circuitinterrupter assembly being illustrated in the closedcircuit position with the operating magnet energized;
  • FIG. 6 is a fragmentary vertical section view taken substantially along line VI--I ⁇ / of FIG. 3, again the contact structure being shown in the open-circuit position;
  • FIG. 7 is an exploded perspective view of the several parts employed in conjunction with the improved operating mechanism of the instant invention.
  • FIG. 8 illustrates, in side elevation, the accurately machined lower interrupter support-plate utilized in the present invention
  • FIG. 9 is front-elevational view of the improved accurately machined interrupter support of FIG. 8;
  • FIG. 10 is an inverted plan view of the accurately machined interrupter support structure of FIG. 8;
  • FIG. 11 illustrates a sectional view taken through the improved shoulder-bolt and movable-contact operator connection for actuating the movable-contact stem of the vacuum-type circuit-interrupter of the present in vention
  • FIG. 12 is an enlarged side-elevational view of the improved movable-contact operator utilized
  • FIG. 13 is a top-plan view of the improved movablecontact operator of FIG. 12;
  • FIG. 14 is a front-elevational view of the improved movable-contact operator of FIG. 12;
  • FIG. 15 is an inverse plan view of the improved movable-contact operator of FIG. 12.
  • FIG. 16 is a fragmentary vertical sectional view taken along the lines XVIXVI of FIG. 5.
  • the present invention has particular applicability to high-voltage motor starters I designed for starting and controlling alternating-current motors.
  • these starters 1 are supplied in a steel floor-mounted enclosure 2, such as set forth in FIG. I.
  • the steel floormounted enclosure 2 may, for example, accommodate two motor starters 1, as actually shown in FIG. I disposed in superimposed relation.
  • the contactor assembly 17 comprises electrically isolated contactor poles 39, 41 and 43 which represents commercially available components, such as the Westinghouse Electric Corporation contactor Type LF- 5OV43O contactor.
  • Contactor electrical terminal 45 as illustrated in FIG. 4, engages an electrical terminal assembly to supply voltage through cables to a remote load, which may be a motor installation.
  • the isolation switch assembly 3 is slidably positioned within the cabinet housing 2 by outwardly protruding flanges which engage horizontal guide tracks.
  • the contactor assembly 7 Due to the weight of the contactor assembly, 7 it is generally located in the bottom section of the cabinet housing 2. The positioning of the contactor assembly 7 within the cabinet housing 2 is accomplished by inserting the wheels 49, which are aflixcd at the four corners of the base 51 of the assembly 7, into guide tracks and rolling the assembly 7 into the cabinet housing 2 until electrical engagement with the electrical terminal assembly occurs.
  • the vacuum-type contactor 7 is designed for starting and controlling three phase, -60 cycle alternatingcurrent motors.
  • the voltage may, for example, be 6,600 and the contactor-closed continuous rating in amperes 360.
  • FIG. 2 illustrates, in side elevation, the right-hand. side 55 of the truck-mounted vacuum-type contactor assembly 7.
  • a direct-current operating magnet 57 having a predominantlyrent magnet coil, or operating coil 59.
  • a rotatable .magnet armature 61 which makes abutting engagement when the operating magnet 57 is energized with the magnetic poleface 63.
  • the lower end 61a of the rotatable magnet armature 61 is affixed by a clamp casting 65 and a key 67 to the external end of an operating shaft 69, as shown.
  • an electrical interlock pushrod 71 which operates an electrical interlock73.
  • FIG. 2 shows a protective resistor 74 which is inserted into the series magnet coil circuit 57 when the armature 61 has reached its fully-closed position against the pole face 63, as illustrated by the full lines in FIG. 2. Additionally, there is illustrated in FIG. 2 another interlock 77. Also FIG. 2 illustrates an isolating-switch mechanical interlock arm 78, which is operable by a downwardlyextending interlock rod (not shown) extending downwardly and operable by the isolating-switch assembly 3.
  • FIG. 3 shows that, in general, the truck-mounted contactor assembly 7 comprises two side metallic support plates and 81 interconnected by a front U- shaped metallic support channel member 83, which is more clearly illustrated in FIG. 3 of the drawings.
  • FIG. 4 shows the lower stab assembly 45 which interconnects the contactor assembly 7 with stationary load terminals for operating an external'piece of equipment, such as an electrical motor.'for example.
  • FIG. 3 illustrates a view looking into the front of the truck-mounted vacuum-type circuit-interrupter assembly, or contactor assembly 7. It will be observed that the armature 61 of the operating magnet 57 affixed to the external end of the operating shaft 69 and effects the rotatable operating motion thereof.
  • the operating shaft 69 is, of course, journaled in suitable bearings 99, 101 provided on the inner sides 80a, 81a of the two metallic side support plates 80 and 81.
  • Each pole-unit 39, .41 or 43 is provided with its own individual vacuum-interrupter unit 103 and a pivotally mounted rotatable contact-operating arm 105. whieh is pivoted upon a stationary pivot pin 107 extending be tween the two downwardly extending flange portions 108, 109 of a U-shaped lower interrupter support 110 the configuration of which is more readily apparent from a study of FIGS. 4 and 5 of the drawings.
  • FIG. 3 taken in conjunction with FIG. 4, more clcarlyshows the structure of the laterally-extending cross-bar 112.
  • the crossbar 112 is preferably of metal, and in this particular instance has a square cross-section, as shown, having end pivot-pins 118, the latter being apparent from a study of FIG. 3 of the drawings.
  • the cross-bar 112 is fixedly secured to an insulator support 120 individual to each of the three pole-units 39, 41, and 43 as more clearly illustrated in FIG. 3.
  • the insulator support 120 supports an abutment member or in this particular instance a plate 122, for example, having a configuration more clearly apparent from a study of FIG. 7 of the drawings.
  • FIG. 7 illustrates an exploded view of the contact-pressure spring assembly 124 and the relationship between the abutment member or plate 122 and a rotatable reversecurrent loop-arm assembly 126, again the configuration of which is more clearly apparent from a study of FIG. 5 of the drawings.
  • a contact drive pin 132 passes through the two leg portions 105a, 1051; of the movable contact-actuating arm 105 and, additionally, passes through a pair of apertures 134 provided in the rotatable reverse-current actuating arm 136.
  • the same pivot pin 132 passes through the two leg portions 105a, 1051; of the contact-actuating arm 105 and also through the leg portions 136a, 1361) constituting the reverse-current arm-assembly 136, thereby enabling a fulcrum point to be exerted at the pivot pin 107 in the contact-welded condition of the separable contacts 138, 139 under certain conditions, as more fully described hereinafter.
  • FIG. 4 illustrates the closed-circuit position of the interrupter device 7 with the operating magnet 57 energized and the compression spring 128 providing the desired contact pressure inthe closedcircuit positionof the device.
  • the operating shaft 69 will rotate in a counterclockwise direction, as viewed in FIG. 4, carrying downwardly with itthe two operating arms 114 and 116 together with the crossbar I 12 and the three insulator supports 120. Also carried downwardly will be the abutment plates 122 and the contact pressure studs 142 until the overtravel adjusting nuts engage the yoke portions 130 of the contact actuating arms 105, as illustrated in FIG. 6 of the drawings. Assuming that there does not exist a welded condition at the separable contacts 138, 139, the operating mechanism 144 will continue its counterclockwise opening movement carrying the separable contacts 138, 139 to their fully-open circuit position, as illustrated in FIG. 6 of the drawings.
  • the interrupter unit 103 may be of any suitable type manufactured commercially by a number of companies, and, in general, comprises an evacuated envelope 145 having end metallic plates 146, 147 hermetically sealed to the ends of the insulating envelope 145, such as a ceramic sleeve, for example.
  • the vacuum bottle 103 is provided having supporting stud portions 149, say three in number, for example, extending upwardly and downwardly as illustrated in FIGS. 5 and 6, and also having the movable contact stem 150 extending externally, as illustrated in FIGS. 6 and 7.
  • the present equipment utilizes preferably, one of these manufactured bottles 103 for each pole-unit 39, 41, 43.
  • an upper interrupter support casting 154 east, in this particular instance, of aluminum, which has a horizontally-extending apertured supportflange portion 154a having mounting holes 1541; therein to accommodate the three upwardly extending mounting studs 149, the latter, as mentioned, constituting a part of the manufactured bottle 103.
  • the casting 154 has a pair of downwardly-slanting support arms 1540, which are interconnected by a second support flange portion, or yoke portion 154d, the latter being affixed to an upper insulator support 158 (FIG. 5) and to a metallic conductor support strap 160, the latter being securely mounted to an upper fusefinger terminal assembly, generally designated by the reference numeral 162, and illustrated more clearly in FIG. 4 of the drawings.
  • a fuse-finger contact-pressure spring 166 is utilized, as illustrated in FIG.
  • a mounting bolt extends vertically through the several component parts. as also shown in FIG. 4.
  • a terminal clamp 186 Fixedly secured to the upper extremity of a lineconneetion strap 160 is a terminal clamp 186 having a clamping portion 186a which encircles the upper extending end 188 of the stationary contact stem 189, as more clearly shown in FIG. 6. Due to the inherent flexibility provided by the line-connection strap 160 (FIG. 4), there is not exerted any stress nor torqueing action upon the stationary contact stem 188. However, with reference to FIG. 4, it will be observed that the bottle structure 103 itself is rigidly supported by the relatively massive and heavy upper interrupting casting support 154.
  • a kickout spring 192 is provided to compensate for the atmospheric pressure, the latter, of course, tending to force the separable contacts 138, 139 into the closed-circuit position, as illustrated in FIG. 5.
  • the kickout spring 192 is interposed between a lower metallic washer 193 and the upper end of contact operator 152.
  • a reverse-current connector-assembly 126 comprising a generally loopshaped flexible connector 195 having an upper terminal 196 fixedly secured by a connector bolt 197 to the lower end of the movable contact operator 152.
  • the flexible connector 195 extends rightwardly, as viewed in FIG. 5, into a loop portion L, and then extends toward the left, as viewed in FIG. 5, to be secured by a connector bolt 199 to the mid-portion 200 of a stationary U-shaped current-feeding member, generally designated by the reference numeral 201 and having a configuration more readily apparent from a study of FIG. 6 of the drawings.
  • the currentfeed structure 201 comprises a pair of stationary L- shaped leg members 210, 211 bolted, as at 212, to the side walls 214, 215 of the lower interrupter casting support 216, and having a bight portion at the front thereof, designated by the reference numeral 200.
  • the bight portion 200 is electrically connected to the lower terminal 198 of the loop-shaped reverse-current loop assembly 126, as indicated more clearly in FIG. 5, which has the desirable advantage, namely an augmentation of the upper movable flexible strap portion 221 by the magnetic field around the leg portions 210, 211 of the L-shaped reverse-current feed structure 126.
  • the novel reverse current loop is provided as shown in FIG. 5.
  • This reverse-current loop 126 provides an increase in contact force and also weld-breaking force which is in proportion to the square of the current I flowing through the reverse current loop.
  • the reverse-current loop 126 consists of upper and lower shunt legs, not shown, plus parallel load connection bus bars 210, 211 as shown in FIGS. 4 and 5.
  • the lower horizontal leg 222 of the shunt and the parallel load connection bus bars 210. 211 are restrained by non-movable parts of the support structure 180, while the upper shunt leg 221 is free to move upward until it strikes the right-hand end of the reversecurrent loop-arm 136.
  • the reverse current loop 126 When the contactor 7 is subjected to a power system fault, of high current magnitude, the reverse current loop 126 will apply a force upward on the right-hand end of the reverse-current loop-arm 136 which will in turn pry the interrupter contacts 138, 139 closed as-. suming the contactor magnet 57 remains closed.
  • a second reaction of the reverse-current loop-arm 136 is to apply a downward force on the contact spring support plate 122 which will in turn increase the opening velocity of the magnet and cross-bar assembly 112 once the magnet 57 is de-energized.
  • connection from the contactor load terminal 45 to the lower leg 222 of the shunt 195 is divided into two parallel legs 210, 211 which straddle and are mounted at the same elevation as the upper leg 221 of the shunt.
  • a kickout spring 192 is mounted directly on the contact shaft of the interrupter 103 to take up the play between the contact actuating mechanism 144 and the interrupter contacts 138, 139. Without a kickout spring 192 in this location, the contacts 138, 139 could touch momentarily under low contact force conditions while play is being taken up in the operating mechanism 144. Play between the contacts and operating mechanism 144 would aggravate the contact erosion and welding problems both on the opening and closing operations.
  • the kickout springs 192 also minimize armature bounce on opening and in addition are proportional to apply sufficient load on the magnet 57 at open gap position to prevent the magnet 57 from picking up unless its operating voltage is sufficient for the magnet 57 to seal-in from the contact-touch position.
  • Each pole 39, 41 and 43 of the contactor may be installed or removed from the contactor as an individual sub-assembly, so that it may be efficiently assembled or maintained at a work-bench rather than in the contactor 7.
  • the interrupter unit itself may also be installed or removed from the contactor as a smaller sub-assembly consisting of the interrupter 103, its support 154, moving contact actuating arm 105, and reverse current loop details 126 as shown in the exploded view of FIG. 7.
  • interrupter 103 and the contact actuating arm 105 are both mounted on a single rigid mechanical detail 110 which can be accurately manufactured.
  • This detail 110 is the lower interrupter mounting bracket shown in FIG. 7.
  • the contacts 138, 139 touch when the contact drive pin 132 is on the same horizontal centerlinc, not shown, as the pivot pin 107 for the contact actuating arm 105.
  • the kickout spring 192 is placed over the contact shaft 150 and then compressed by the contact operator 152 which in turn is held in place by the shoulder bolt 239.
  • the shoulder bolt 239 is only tightened finger tight so as not to apply excessive torque to the interrupter shaft 150 and bellows 235.
  • the contact operator 152 and shoulder bolt 239 design is coordinated in a manner that the shoulder bolt 239 cannot clamp the contact operator 152 to the contact shaft 150, but instead permits the contact operator 152 to rotate freely on the contact shaft 150 without applying torque to the Contact shaft 150 when the contact operator 152 is being lined up with the contactactuating arm 105.
  • the contact actuating arm 105 is depressed to take up the play between the Contact drive pin 132 and contact shaft 150 following which the contact operator 152 is clamped to the contact shaft 150 by tightening the clamping bolt 241.
  • the contact shaft 150 In normal service, the contact shaft 150 will be actuated through the clamped joint between it and the contact operator 152, but should this joint fail the contacts 138, 139 will then be closed by compression of the parts between the drive pin 132 and the end 150a of the contact shaft 150, and opened by the shoulder bolt 239.
  • One of the objects of the present invention is to prevent excessive torque from being applied to the shaft 150 of the interrupter 103 during maintenance and/or assembly since torque may destroy or shorten the mechanical life of the interrupter bellows 235.
  • the shoulder bolt 239 acts as an assembly fixture to compress the kickout spring 192 during assembly while still allowing the contact operator 152 to be rotated as required to install the contact drive pin 132.
  • the shoulder bolt 239 in addition acts as a safety device to insure opening of the contacts in the event the contact operator 152 is not securely clamped to the interrupter contact shaft 150.
  • the interrupter 103 is rigidly supported at its upper end, which contains the interrupter stationary contact 138 so as to avoid transmitting contact forces through the walls 145 of the interrupter 103.
  • the moving contact end 150 of the interrupter 103 in addition is clamped to the stationary portion of the pole assembly to provide lateral stability. Clamping of the lower end of the interrupter sub-assembly SB is accomplished by means of an oversized open slot 243 which compensates for the manufacturing tolerances of the interrupter 103 and also simplifies installation and removal of the interrupter sub-assembly 58".
  • the final lengths of the contact springs 128 will also vary from their nominal value resulting in either high or low contact forces.
  • the average contact force in the case of a multiplepolc contactor, as shown in the drawings, can, however, be corrected by adjusting the angular position of the magnet armature 61 on the operating shaft 69 so that the correct average contact spring length and force 128 is obtained when the magnet 57 is sealed-in.
  • Angular position adjustment of the magnet armature 61 is a standard feature of an existing air-break contactor magnet 57 applied to the disclosed vacuum contactor 7.
  • the shoulderbolt 239 may have an Allen head with an enlarged portion 239a and a reduced portion 239! with a shoulder 247 thercbetween, so that the shoulder-bolt, when tightened, will force washers 249 (FIG. 11) against the lower extremity 150a of the moving-contact shaft 150 of the vacuum-type interrupter 103. This is shown in FIG, 11.
  • the number of washers 249 is arranged to accommodate the tolerances provided between the different movable contact shafts 150 of the several pole-units 39, 41 and 43.
  • VACUUM-BOTTLE TOLERANCES Despite the wide latitude of the tolerances provided in the manufacture of the vacuum bottles 103, it is desired not to impose any stress upon the ceramic envelope 145, or to effect the breakage of any of the hermetic seals to effect this end, an accuratelymachined lower-interrupter support-plate 110 having the pivot apertures 252 provided therein is supplied. These pivot apertures 252 may be accurately machined, and once the vacuum bottle 103 is fixedly secured by the upper interrupter casting 154, as a first operation, subsequently, as a separate operation. the U-shaped accurately machined support plate 110 is secured into place by the lower three mounting bolts 149. The pivot-pin 132 may then be accurately located with respect to the lower interrupter support 110 because of the accurate machining of the pivot apertures 252 therein.
  • the function of the reverse-current loop-system changes in dependence upon whether or not the operating magnet 57 is energized, or is not energized.
  • an additional force is provided to maintain the contacts 138, 139 closed during the existence of heavy-fault-current conditions.
  • the fulcrum point changes, or is relocated to thereby provide, instead ofa closing force, in this instance an opening force, which assists and augments the accelerating opening springs.
  • a circuit-interrupting structure including a vacuum-type interrupting unit having a relatively-stationary contact and a eooperable movable contact.
  • metallic bellows means for hermetically sealing the movable contact to the envelope of said unit, a movable-contact stem for supporting and for moving the movable contact, a movable-contact operator having a relativelyloose fit upon the exterior end of the movable-contact stem, said movable-contact operator having at least one supporting pivot aperture provided therein, a rotatable contact-operating lever having a fixed pivot adjacent one end thereof and a contactactuating pin extending therethrough which, additionally, extends through said one pivot aperture provided in the movable-contact operator.
  • a bolt for captively securing said movable-contact operator to the external end of the movable-contact stem, and clamping means for clamping the movable-contact operator to the external end of the movable-contact stem after insertion of the contact-actuating pin through the contactoperating lever and also through the movable-contact operator.
  • the bolt is a shoulder-bolt having an enlarged diameter portion and an end relatively-small-diameter portion, the relatively-small-diameter portion 'being threadedly secured into a tapped bore provided in the external extremity of the movable-contact stem.
  • the movable-contact operator generally comprises a cylindrically shaped metallic member having one end bore loosely surrounding the extremity of the movableeontact stem, an intermediate relatively reduced portion for accommodating a shank portion of the bolt. and an enlarged end portion for accommodating the head of the bolt.
  • a vacuum-type circuit interrupting unit including a relatively stationary contact and a cooperable movable contact, a movable-contact stem supporting said movable contact and effecting the opening and closing motions thereof, a metallic sylphon bellows having one end hermetically sealed to the movable-contact stem and the other end hermetically sealed adjacent one end of the circuit-interrupting unit, one end of the movable-contact stem protruding externally of the evacuated envelope of the circuitinterrupting unit, a movable-contact operator having a loose removable yet available manual clamping engagement with the external protruding extremity of the movable-contact operator and additionally having a pivot-supporting aperture provided therein, a rotatable contact-operating lever.
  • the bolt is a shoulder-bolt having an enlarged-diameter portion and an end relatively-small-diameter portion, the relatively-small-diameter portion being threadedly secured into a tapped bore provided in the external extremity of the movable-contact stem.
  • operating-lever means carries said contactcompression spring and has additionally a stud passing through the contact-compression spring and also passing through an aperture provided at the said other end of the rotatable contact-operating lever for providing contact compression in the closed-circuit position of the interrupter.
  • the movable-contact operator generally comprises a cylindrically shaped metallic member having one end bore loosely surrounding the extremity of the movablecontact stem, an intermediate relatively reduced portion for accommodating a shank portion of the bolt, and an enlarged end portion for accommodating the head of said bolt.
  • said bolt is a shoulder bolt having an enlarged-diameter portion and an end relatively-small-diameter portion, the relatively-Small-diameter portion being threadedly secured into a tapped bore provided in the external extremity of the movable-contact stem.

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US481423A 1974-06-20 1974-06-20 Movable contact-stem operator for a vacuum-type circuit-interrupter Expired - Lifetime US3898407A (en)

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US481423A US3898407A (en) 1974-06-20 1974-06-20 Movable contact-stem operator for a vacuum-type circuit-interrupter
CA228,892A CA1036648A (fr) 1974-06-20 1975-06-09 Ensemble de tige-contact mobile pour interrupteur a vide

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US481423A US3898407A (en) 1974-06-20 1974-06-20 Movable contact-stem operator for a vacuum-type circuit-interrupter

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3956721A (en) * 1975-04-16 1976-05-11 Rte Corporation Fault interrupter
DE2935915A1 (de) * 1978-09-13 1980-03-27 Westinghouse Electric Corp Elektrischer vakuumschalter
US5436414A (en) * 1993-07-16 1995-07-25 Eaton Corporation Drive mechanism for circuit interrupters
US5530216A (en) * 1995-03-07 1996-06-25 Eaton Corporation Flexible connector for a circuit breaker
US5864109A (en) * 1998-01-30 1999-01-26 Lg Industrial Systems Co., Ltd. Terminal connection locking apparatus for vacuum circuit breaker
EP1772883A1 (fr) * 2005-10-04 2007-04-11 ABB Technology AG Interrupteur à moyenne tension et panneau
EP2037475A1 (fr) * 2007-09-13 2009-03-18 Eaton Electric B.V. Mécanisme de fonctionnement doté de réglage de force de contact
US9679708B2 (en) 2014-04-11 2017-06-13 S&C Electric Company Circuit interrupters with masses in contact spring assemblies
US9685280B2 (en) 2014-04-11 2017-06-20 S&C Electric Company Switchgear operating mechanism

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784774A (en) * 1972-08-21 1974-01-08 Ite Imperial Corp Vacuum circuit breaker current transfer and actuation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784774A (en) * 1972-08-21 1974-01-08 Ite Imperial Corp Vacuum circuit breaker current transfer and actuation

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3956721A (en) * 1975-04-16 1976-05-11 Rte Corporation Fault interrupter
DE2935915A1 (de) * 1978-09-13 1980-03-27 Westinghouse Electric Corp Elektrischer vakuumschalter
US4247745A (en) * 1978-09-13 1981-01-27 Westinghouse Electric Corp. Vacuum-type contactor assembly
US5436414A (en) * 1993-07-16 1995-07-25 Eaton Corporation Drive mechanism for circuit interrupters
US5530216A (en) * 1995-03-07 1996-06-25 Eaton Corporation Flexible connector for a circuit breaker
US5864109A (en) * 1998-01-30 1999-01-26 Lg Industrial Systems Co., Ltd. Terminal connection locking apparatus for vacuum circuit breaker
EP1772883A1 (fr) * 2005-10-04 2007-04-11 ABB Technology AG Interrupteur à moyenne tension et panneau
EP2037475A1 (fr) * 2007-09-13 2009-03-18 Eaton Electric B.V. Mécanisme de fonctionnement doté de réglage de force de contact
US9679708B2 (en) 2014-04-11 2017-06-13 S&C Electric Company Circuit interrupters with masses in contact spring assemblies
US9685280B2 (en) 2014-04-11 2017-06-20 S&C Electric Company Switchgear operating mechanism

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Publication number Publication date
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