US3710298A - Drive mechanism for electrical circuit breakers - Google Patents

Drive mechanism for electrical circuit breakers Download PDF

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Publication number
US3710298A
US3710298A US00200767A US3710298DA US3710298A US 3710298 A US3710298 A US 3710298A US 00200767 A US00200767 A US 00200767A US 3710298D A US3710298D A US 3710298DA US 3710298 A US3710298 A US 3710298A
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US
United States
Prior art keywords
drum
cartridge
magazine
drive
cartridges
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
US00200767A
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English (en)
Inventor
H Strubin
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.)
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
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 BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
Application granted granted Critical
Publication of US3710298A publication Critical patent/US3710298A/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
    • H01H39/00—Switching devices actuated by an explosion produced within the device and initiated by an electric current
    • H01H39/002—Switching devices actuated by an explosion produced within the device and initiated by an electric current provided with a cartridge-magazine

Definitions

  • ABSTRACT A drive for the contact mechanism of an electrical circuit breaker includes a double-acting pneumatic motor coupled to the contact mechanism for effecting disengagement as well as engagement of the contacts which is driven by explosion gases generated by the firing of cartridges stored in magazines, the cartridges being fed automatically from the magazines into firing chambers provided in a rotationally mounted drum. Cartridge feed into and ejection from the firing chambers from the magazines is accomplished in alternation as the drum is rotated alternately in opposite directions, and each firing chamber is associated with a duct leading to a corresponding end of the motor cylinder so that when a cartridge is fired in one chamber, the motor piston is driven in one direction,
  • the principal object of the present invention is to provide an improved drive for the contact mechanism of an electrical circuit breaker wherein the piston of a double-acting pneumatic motor coupled to the contact mechanism for effecting disengagement as well as engagement of the contacts is driven by explosion gases generated by the firing of cartridges which are stored in magazines, the cartridges being fed automatically from the magazines into firing chambers provided in a rotationally mounted drum.
  • Cartridge feed into and ejection from the firing chambers from magazines is accomplished in alternation as the drum is rotated alternately in opposite directions, and each firing chamber is associated with a duct leading to a corresponding end of the motor cylinder so that as a cartridge is fired in one chamber, the motor piston is driven in one direction, and as the next cartridge is fired in the other chamber, the motor piston is driven in the other direction.
  • the necessary alternate rotation of the drum in opposite directions is obtained from the explosion gases themselves.
  • FIG. 1 is a view in side elevation of the improved circuit breaker contact actuating mechanism showing in general the double-acting pneumatic motor, the rotary drum and cartridge magazines;
  • FIG. 2 is a view in end elevation with a portion of the cartridge magazine structure shown in section;
  • FIG. 3 shows, at an enlarged scale, and in the direction of the arrow in FIG. 2, the magazine changing mechanism wherein one magazine when depleted is automatically replaced with a fully loaded magazine;
  • Each dual magazine structure consists of two separate magazine units and the magazine units 1' and 1" of the dual magazine structure 1 are depicted in FIG. 2 since these two magazine units are the ones which are in actual use in accordance with the operating condition indicated in FIG. 1.
  • the magazine units of the dual magazine structure 2 are identical with those of the dual magazine structure 1 and shift into the loading position after all of the cartridges in the magazine units 1, 1" have been fired.
  • each magazine 1 1 is provided with a spirally formed wall 4 which establishes a correspondingly formed spiral guideway 5 along which the cartridges 6 are advanced to the magazine outlet by means of a pin 7 in contact with the cartridge at the innermost point of the guideway 5 and which pushes against the spiral row of cartridges.
  • Pin 7 is supported in a slot provided in a lid 9 of the cylindrical magazine casing, and this lid ismounted for rotation about its center on the magazine casing and is driven in rotation by means of a spring motor, the driving force being stored in a wound-up spiral spring 11 concentric with lid 9. As the lid 9 is rotated, pin 7 is free to move outwardly along its mounting slot and thus is enabled to follow the expanding spiral path taken by the cartridges.
  • Two other laterally spaced compressed springs 15, each having one end thereof bearing against a fixed abutment and the other end bearing against the intermediate support plate 3 for the magazine are then enabled to exert the force stored therein against the support plate 3 and shift the latter, and hence the magazines 1 and 2 along a pair of guide rails 16 until stopped by an abutment 17, in which position, the empty dual magazine 1 (magazine units 1', 1") will have been shifted out of the loading position and the full magazine 2 into the loading position.
  • the pin 7 which follows the cartridges in the magazine may also be utilized to actuate a signalling means of known type, but not illustrated so that an alarm is set off when the magazines are emptied to a predetermined degree.
  • the double-acting pneumatic motor 18 includes cylinder 19 in which a piston 20 connected to the contact mechanism of the circuit breaker is reciprocated by the explosive forces of the cartridges which are fired in a rotationally mounted drum 8 has been shown only generally by way of an elevational view. The structural details of these operating components are illustrated in FIGS. 4 to 6.
  • the double-acting piston 20 is guided for reciprocation in its working cylinder 19, and piston rod 21 is cou- 1 pled to the contact mechanism of the circuit breaker,
  • the double acting pneumatic motor 18 includes driving chambers 22, 22 located at opposite ends of casing27 in which the drum is mounted for rotation about its axis.
  • the other half of the drum periphery has a diameter somewhat less than the diameter of casing 27 so as to establish a slight arcuate gap therebetween, this gap being interrupted by a radially inward projection 25 on casing 27 that reaches essentially to the surface of the drum.
  • FIG. depicts the position of drum 8a wherein a cartridge 6 previously loaded into firing chamber 24 from magazine 1" has been moved into the firing position, while another cartridge 6 has just been loaded into the other firing chamber 26 from magazine 1.
  • the ensuing explosion gases discharged under pressure from the left end of the chamber, as viewed in FIG. 4 are forced through duct 23 into the driving chamber 22 and hence drive piston and hence piston rod 21 from left to right to actuate the circuit breaker contacts from closed to open position.
  • these same explosive gases work in the arcuate gap between projection and the chamber 24 and, after a delay to be later described, drive the drum 8a in a clockwise direction to the ultimate position indicated by the dashed line positionsof the firing chambers 24, 26.
  • the intermediate position of the drum 8a illustrated in FIG. 6 depicts the moment during the course of rotation at which the cartridge 6 is'being ejected from its opensided firing chamber 24by combined actions of centrifugal force and gas pressure, the outwardly moving cartridge serving to force a closure flap 28 outwardly against the counter action of a leaf spring 29 and hence open up a cartridge discharge chute.
  • drum 8a will be actuated in a reciprocating manner in the sense that it is driven first in one direction and then the other through a part of a revolution and piston 20'willbe reciprocated so as to'actuate the circuit breaker contacts to effect their'engagement and disengagement also in alternation.
  • a locking pin 31 is provided to cooperate, in the I limiting positions of the drum 8a with recesses 30 in the latter to prevent excessively early commencement of the rotary motion of the drum during firing.
  • this locking pin 31 is actuated into or out of the recesses 30 by means of a bellcrank lever 34, one arm of this lever being articulated to pin 31 and the other arm thereof being terminated in a follower roll 33 adapted to ride against a double cam provided on sleeve 32 which surrounds piston rod 21, the'arrangement of this train of components being such that lever 34 will not be actuated to effect release of locking pin 31 and therefore permit drum 8a to rotate, until the piston 20 and its rod 21 have nearly reached their end position, this being effected by means of a collar on piston rod 21 that picks up internal end flanges provided on cam sleeve 32 and shifts the sleeve near the end of the piston rod stroke.
  • the firing circuits for the cartridges 6 have not been illustrated since these are well known, as for example, by way of an electrical contact in the firing chamber 24, 26 connected to complementary firing means provided within the cartridge.
  • a drive for the contact mechanism of an electrical circuit breaker comprising a double-acting pneumatic motor the piston of which is coupled to said contact actuating mechanism for effecting engagement and disengagement respectively of the contacts as said piston is reciprocated within its cylinder, a rotatable cylindrical drum including a pair of circumferentially spaced firing chambers established by longitudinally extending slots in the drum opening in the outward direction for receiving cartridges charged with a gas-forming explosive material, a cylindrical housing surrounding said drum and within which said drum is mounted for rotation about its axis, duct means correlated respectively with the gas discharge ends of said cartridge receiving slots and which lead respectively to opposite ends of said motor cylinder, a cartridge magazine individual to each of said cartridge receiving slots and which includes means for automatically feeding the cartridges therefrom when presented to the open side of said slots, said cartridges when fired in alternation in said slots serving to produce explosion gases which are delivered in alternation to the opposite ends of said motor cylinder, means including auxiliary firing chambers correlated respectively to each of said slots and which are formed in gaps provided
  • a drive for the contact mechanism of an electrical circuit breaker as defined in claim 5 wherein said means controlled by the movement of said piston rod of said double-acting motor for releasing said locking pin from the recess in said drum as the latter nears the end of its stroke is constituted by a double cam sleeve surrounding said piston rod and which is provided with inwardly extending end flanges, said piston rod is provided with a collar engageable with said end flanges on said sleeve to shift the latter, and said cam on said sleeve actuates a cam follower roller carried by a lever coupled to said locking pin.
  • each said cartridge magazine includes a spirally configured path along which a row of said cartridges travel to the loading position into the slots provided in said drum, wherein a follower feed pin engages the inner end of said row of cartridges to move the cartridges along said spiral path, wherein said cartridge magazines are arranged in a plurality of pairs, said magazine pairs being mounted for movement in succession to the cartridge loading position adjacent the cartridge receiving slots provided on said drum, and wherein there is further provided a means actuated by the said follower feed pin of one of said magazines of a magazine pair at said loading position and which is responsive when said magazine has been emptied to shift the empty magazine pair from the loading position and present the next fully loaded magazine pair to the loading position.

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  • Portable Nailing Machines And Staplers (AREA)
  • Circuit Breakers (AREA)
US00200767A 1970-12-09 1971-11-22 Drive mechanism for electrical circuit breakers Expired - Lifetime US3710298A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1830970A CH524889A (de) 1970-12-09 1970-12-09 Antrieb für elektrische Schalter

Publications (1)

Publication Number Publication Date
US3710298A true US3710298A (en) 1973-01-09

Family

ID=4432042

Family Applications (1)

Application Number Title Priority Date Filing Date
US00200767A Expired - Lifetime US3710298A (en) 1970-12-09 1971-11-22 Drive mechanism for electrical circuit breakers

Country Status (8)

Country Link
US (1) US3710298A (de)
CA (1) CA937615A (de)
CH (1) CH524889A (de)
DE (2) DE2100628A1 (de)
FR (1) FR2117424A5 (de)
GB (1) GB1320430A (de)
IT (1) IT941986B (de)
SE (1) SE367091B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3621186A1 (de) * 1986-06-25 1988-01-07 Bbc Brown Boveri & Cie Verfahren und vorrichtung zum antrieb eines linear bewegbaren bauelementes, insbesondere des beweglichen schaltkontaktes eines elektrischen hochspannungs-leistungsschalters

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1923323A (en) * 1930-08-09 1933-08-22 Railway & Ind Engineering Comp Repeater circuit breaker
US3180957A (en) * 1960-07-29 1965-04-27 Ite Circuit Breaker Ltd Auxiliary contact device with deformable contact operated by an explosive
US3190990A (en) * 1961-10-16 1965-06-22 Allis Chalmers Mfg Co Explosive actuated switch

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1923323A (en) * 1930-08-09 1933-08-22 Railway & Ind Engineering Comp Repeater circuit breaker
US3180957A (en) * 1960-07-29 1965-04-27 Ite Circuit Breaker Ltd Auxiliary contact device with deformable contact operated by an explosive
US3190990A (en) * 1961-10-16 1965-06-22 Allis Chalmers Mfg Co Explosive actuated switch

Also Published As

Publication number Publication date
IT941986B (it) 1973-03-10
SE367091B (de) 1974-05-13
DE2100628A1 (de) 1972-06-15
FR2117424A5 (de) 1972-07-21
DE7100451U (de) 1972-09-21
GB1320430A (en) 1973-06-13
CA937615A (en) 1973-11-27
CH524889A (de) 1972-06-30

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