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US3749867A Expired / Lapsed US ⏱️ 0.0 years remaining

Spaced-metallic-plate-type of arc-chute for a switch

Assignee: Westinghouse Electric Corp
•
Filing: 1971-04-19
•
Granted: 1973-07-31
•
Expires: 1991-04-19
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Abstract

Abstract An improved spaced metallic plate-type of arc chute construction is provided for a switch, in which the spaced metallic plate structure is in close proximity to both the main separable contacts, as well as to the separable arcing contacts. In one construction, the inner edges of the spaced metallic plates are generally parallel to the one, or several main contacts of the switch, with an elongated slot provided in the central portion of the plate structure to accommodate the protruding movable tip portion of the centrally-located separable main arcing contacts. In a modification of the spaced metallic plate arc-chute structure, minor closed-end slots are, additionally, provided in the plate structure to tend to promote arc transfer movement from the separable main contacts into the spaced plate structure, to thereby provide additional cooling and deionization effects. In a third modification of the spaced metallic plate structure of the present invention, curved minor closed-end slots are provided adjacent the main separable contact structure to additionally magnetically promote arc transfer movement from the main separable contacts into the plate structure for increased cooling and deionization effects.

Inventors

  • 👤 J Rexroad

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 22:56
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/30; H01H9/34; H01H9/36

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 83 words
A switch structure including a pair of separable arcing contacts and two pairs of main contacts situated on both sides of said separable pair of arcing contacts, means establishing three arcs at both the two pairs of separable main and also at the separable arcing contacts, means defining a spaced metallic plate structure closely confining the separable arcing contacts as well as confining the two pairs of main contacts, whereby the three parallel arcs are moved into the plate structure for arcextinction purposes.
Claim 2
Dependent Claim 83 words
A switch structure including a pair of separable arcing contacts and two pairs of main contacts situated on both sides of said separable pair of arcing contacts, means establishing three arcs at both the two pairs of separable main and also at the separable arcing contacts, means defining a spaced metallic plate structure closely confining the separable arcing contacts as well as confining the two pairs of main contacts, whereby the three parallel arcs are moved into the plate structure for arcextinction purposes.
Claim 3
Dependent Claim 27 words
The combination according to claim 1, wherein a centrally-arranged main arcing slot is provided to accommodate the separable arcing contacts, the latter protruding into the plate structure.
Claim 4
Dependent Claim 39 words
The combination according to claim 1, wherein minor slots are provided in the spaced plates adjacent the two pairs of separable main contacts to encourage arc movement into the plate structure from the two pairs of separable main contacts.
Claim 5
Dependent Claim 33 words
The combination according to claim 1, wherein curved minor slots are additionally provided in the plate structure adjacent the two pairs of separable main contacts to encourage arc movement into the plate structure.
Claim 6
Dependent Claim 38 words
The combination according to claim 2, wherein additional minor slots are provided in the spaced plates adjacent the two pairs of main contacts to encourage arc movement from the three pairs of separable contacts into the plate structure.
Claim 7
Dependent Claim 55 words
The combination according to claim 1, wherein the plates have outer leg portions and centrally-provided notches, and additionally the plate structure has minor notches provided in the inner side corners of the plates to prevent arc termination at the corners, and instead to promote arc movement away from the said inner corners of the plates.
Claim 8
Dependent Claim 11 words
The combination to claim 6, wherein the minor notches are curved.

References Cited (Backward Citations)

US2147419A Cited
US3513275A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-07-30 1977-01-29 1977-07-31 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-07-30 1981-01-29 1981-07-31 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-07-30 1985-01-29 1985-07-31 $7700.00 Window Closed / Lapsed

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