US2743336A - Circuit interrupter and method of making the same - Google Patents

Circuit interrupter and method of making the same Download PDF

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Publication number
US2743336A
US2743336A US323010A US32301052A US2743336A US 2743336 A US2743336 A US 2743336A US 323010 A US323010 A US 323010A US 32301052 A US32301052 A US 32301052A US 2743336 A US2743336 A US 2743336A
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US
United States
Prior art keywords
arc
ridges
wall member
primary
chute
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
US323010A
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English (en)
Inventor
Robert C Dickinson
Russell E Frink
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
Priority to BE524652D priority Critical patent/BE524652A/xx
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US323010A priority patent/US2743336A/en
Priority to FR1091099D priority patent/FR1091099A/fr
Application granted granted Critical
Publication of US2743336A publication Critical patent/US2743336A/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
    • 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
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate

Definitions

  • a further object of our invention is to provide an improved process or method of manufacturing arc-chute side-wall members of the foregoing type.
  • Figure 1 is a side elevational view, partially in vertical section, showing a circuit interrupter embodying our invention, the contact structure being shown in thel closedcircuit position;
  • Fig. 2 is a fragmentary, vertical sectional view taken along the line II-II of Fig. 1;
  • Fig. 3 is a sectional view through one of our finished, insulating, side-wall members
  • Fig. 4 is a fragmentary top plan view of the finished insulating, sideawall member of Fig. 3;
  • Fig. 5 is a fragmentary view looking at thel other, or lower, end of the side-wall member of Fig. 3;
  • Fig. 6 is a fragmentary, sectional view taken substantially along the line VI-VI of Fig. 2;
  • Fig. 7 is a fragmentary, lower-end view of the insulat ing blank used in forming one of our finished, insulating side-wall members;
  • Fig. 8 is a fragmentary view, partially in section, showing the cutting operation being performed upon a blank such as shown in Fig. 7.
  • the reference numeral 1 generally designates suitable contact structure which, when separated to the open-circuit position, establishes lan arc which is moved upwardly into an arc chute, generally designated by the reference numeral 2 as a result of the transverse magnetic eld set up by the blowout coil 3 and associated magnet structure 4.
  • a rotatable contact arm 5 carries a conducting bridge 6, which, in the closed-circuit position, as shown in Fig. 1, interconnects stationary main contacts 7, 8
  • a contact stud 9 carries the current from the stationary main contact 7, through an insulating bushing 10 to the external circuit.
  • the contact stud for the stationary mainy contact 8 is not shown, but it may be identical to the contact stud 9. l
  • the electrical circuit comprises the contact stud 9, stationary main contact 7, conducting bridge 6, stationary main contact 8, to the Contact stud therefor, not shown, to the external circuit.
  • the contact arm 5 is rotated in a clockwise direction about. a pivot pin, not shown, but which is in electrical contact with the stationary main contact 8, to draw an arc between the arcing contacts 11, 12 after the separation of conducting bridge 6 from the main contacts 7, 8.
  • blowout coil 3 When this occurs, the blowout coil 3 will be put into series circuit, and the transverse magnetic field set up thereby between the field pole members 14 (Fig. 2) will move the established arc upwardly along the arc terminal members 18, 19 into the arc chute 2.
  • the electrical circuit now comprises contact stud 9, conductor 20, blow out coil 3, contact clip 15, arc terminal member 18, the arc itself, arc terminal member 19, exible shunt 28, contact arm 5 to the other contact stud, not shown.
  • the arc chute 2 comprises an insulating rectangularlyf shaped housing member 22 positioned adjacent to an insulating plate 21, the latter serving as a base for the blowout coil 3. Within the housing 22 is placed a parot' mating or cooperating identical insulating spaced sidewall members 23, 24.
  • Fig. 3 shows a sectional ⁇ view through one of the insulating side-wall members 24.
  • the side-wall member 24 has a v side-wall portion 24a, and a plurality of primary ridges 24h.
  • each primary ridge 24b has an offset portion 24e, the purpose for which will be more apparent hereinafter.
  • Disposed between adjacent primary ridges 24b are a plurality of secondary ridges 24d, the configuration of which is more clearly apparent from an inspection of Figs. 4 and 5 of the drawings.
  • the offset portions 24C of the side-wall member 24 engage the side-wall portion 23a of the side-wall member 23.
  • the secondary ridges 24d of the side-,wall member 24 cooperate with the primary ridges 231)4 of the side-wall member 23, in a manner more clearly shown in Fig. 2 of the drawings.
  • the primary ridges of one side-wall member are in substantially the same plane as the sec ondary ridges of the other side-wall member, so that the effect of assembling two of the side-wall members 23, 24 results essentially in a spaced-slotted-plate construction, as more clearly shown in Figs. 2 and 6 of the drawings.
  • notches or pockets 26 provide cool surfaces and a quantity of un-ionized gas which cools the arc 2S and brings about its rapid extinction.
  • our improved construction unlike the prior-art arrangements, does not permit the arc to move along the outer edge of the primary ridges near the exhaust end of the arc chute. As indicated in Figs, 2 and 3, the arc 25 moves up to the point A, where it is stopped by the solid insulating material forming the offset ridge portion 23C or 24C. Hence, the arc 25 is effectively trapped at this point A, and has no tendency to wear its way along to the exhaust end of the arc chute 2.
  • AI ⁇ ig..7 indicates how a blank side-wall member is con,.-
  • FIG. 8 shows a fragmentary lower-end view of a blank, in which the shallow valley 32 is bounded or defined by the sides of the contemplatnishe'dridges 33 and by the 'tops kof theuniinishe'd secondaryridges.
  • the blank of Fig. 8 As'shown in Fig. "8, ⁇ by employing a gang of ⁇ spaced 'cutters l56, separatedby spacers 37, 37a and arranged for 'simultaneous ⁇ actuation on the 'same cutter shaft'38, the blank of Fig.
  • Patent'2,442, ⁇ l ⁇ 9 ⁇ 9 issued'MayZS, 1948, to Robert C. Dickinson and'Russell E. Frink and assigned to the assignee of the-instant application.
  • YSpacersgof accurate thickness are placed between the plates, and the assembly is clamped together and baked so as to set up the cement. The spacers are then removed.
  • the plates are pressed with atie across the open end of the notch. After ring, the 'ties must'be cnt oi.
  • the structure-of our invention has several advantages over interrupters made previously by methodsvsomewhat similar ⁇ to this.
  • the secondary ridges 24d, 23d had not been used, the primary ridges ⁇ 23,17, '24b projecting in a smooth curve close to the opposite side-wall member but not meeting it.
  • the arc can go completely through the'interrupter and continueto burn over the other end.
  • anexpensive mutlier must be provided. This muler generates backpressure and impedes theprogress ofthe arc; the theory' being that if the arc moves slowly enough, interruption will occur before the arc has gone completely through the interrupter.
  • thestrueture as described, may be made of 'a'red ceramicp'orcelain, it could bemade from any suitable material 'for "interf rupters of this type, such as "cold-moldedasbestosiPortland-'cement mixtures, etc.
  • A'circuit-interruptor including relatively movable contacts between which'a'n arcmaybe'formed'uponopening the circuit, an insulating arc4 chute in which thejarc is moved including'spaced side wall membersfe'ahiside wallmember having onitsside facing the other'sidewall member -a plurality of primary vridges extending 'lon'gif tudinally in lthe general direction'fof movement r of *said arc throughsaid chute,vat least some of the primary ridges having'oiset portions to engage the opposite WalL'and a plurality of cooperating secondaryridgcs "in-the Isame general 'plane as the said some primary ridges extending inwardly from the opposite side wall member.
  • a circuit interrupter including relatively movable contacts between which an arc may be formed upon opening the circuit, an insulating arc chute in which the arc is moved including spaced side wall members, each side wall member having on its side facing the other side wall member a plurality of primary ridges extending longitudinally in the general direction of movement of said arc through said chute, at least some of the primary ridges having olfset portions beginning at a point intermediate the ends of the arc chute to engage the opposite wall, a plurality of cooperating relatively short secondary ridges in the same general plane as the said some primary ridges extending inwardly from the opposite side wall member, and the offset portions extending over and engaging the secondary ridges to form a generally slotted plate construction.
  • a circuit interrupter including relatively movable contacts between which an arc may be formed upon opening the circuit, an insulating arc chute in which the arc is moved including spaced side wall members, each side wall member having on its side facing the other side wall mem ⁇ ber a plurality of primary ridges extending longitudinally in the general direction of movement of said are through said chute, the primary ridges of one side wall member at least partially overlapping the primary ridges of the other side wall member, at least some of the primary ridges having offset portions to engage the opposite wall, and a plurality of cooperating secondary ridges in the same general plane as the said some primary ridges extending inwardly from the opposite side Wall member.
  • a circuit interrupter including relatively movable contacts between which an arc may be formed upon opening the circuit, an insulating arc chute in which the arc is moved including spaced side wall members, each side Wall member having on its side facing the other side wall member a plurality of primary ridges extending longitudinally in the general direction of movement of said arc through said chute, the primary ridges of one side wall member being staggered with respect to the primary ridges of the opposite wall member, at least some of the primary ridges having oiset portions to engage the opposite wall, and a plurality of cooperating secondary ridges extending inwardly from the opposite side wall member and being in the same general plane as the said some primary ridges.
  • a circuit interrupter including relatively movable contacts between which an arc may be formed upon opening the circuit, an insulating arc chute in which the arc is moved including spaced side wall members, each side wall member having on its side facing the other side wall member a plurality of primary ridges extending longitudinally in the general direction of movement of said arc through said chute, the primary ridges of one wall being slightly spaced from, overlapping and staggered with respect to the primary ridges of the opposite wall so that the arc in passing through said chute is forced to take a tortuous closely confined path around the outer edges of portions of said primary ridges, at least some of the primary ridges having offset portions to engage the opposite wall, and a plurality of cooperating secondary ridges in the same general plane as the said some primary ridges extending inwardly from the opposite side wall member.
  • the method of making a side-wall member for an arc chute including the steps of: forming a blank of insulating material having a plurality of primary ridges with aligned deep and shallow valleys therebetween, running a pair of spaced cutters along the deep valley, and cutting into the two bottom corners of the shallow valley to form a second ridge of less height.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
US323010A 1952-11-28 1952-11-28 Circuit interrupter and method of making the same Expired - Lifetime US2743336A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE524652D BE524652A (he) 1952-11-28
US323010A US2743336A (en) 1952-11-28 1952-11-28 Circuit interrupter and method of making the same
FR1091099D FR1091099A (fr) 1952-11-28 1953-11-26 Interrupteur et procédé de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US323010A US2743336A (en) 1952-11-28 1952-11-28 Circuit interrupter and method of making the same

Publications (1)

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US2743336A true US2743336A (en) 1956-04-24

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US323010A Expired - Lifetime US2743336A (en) 1952-11-28 1952-11-28 Circuit interrupter and method of making the same

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US (1) US2743336A (he)
BE (1) BE524652A (he)
FR (1) FR1091099A (he)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306204A (en) * 1939-10-11 1942-12-22 Gen Electric Electric arc extinguishing apparatus
US2393164A (en) * 1943-02-27 1946-01-15 Gen Electric Electric circuit breaker
US2417683A (en) * 1944-04-13 1947-03-18 Gen Electric Electric air circuit breaker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306204A (en) * 1939-10-11 1942-12-22 Gen Electric Electric arc extinguishing apparatus
US2393164A (en) * 1943-02-27 1946-01-15 Gen Electric Electric circuit breaker
US2417683A (en) * 1944-04-13 1947-03-18 Gen Electric Electric air circuit breaker

Also Published As

Publication number Publication date
BE524652A (he)
FR1091099A (fr) 1955-04-06

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