Polymeric weathershed surge arrester and method
AssigneeMcGraw-Edison Company
InventorJeffrey Joseph Kester
Life of this patent
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Abstract
An elastomeric surge arrester housing includes a sleeve having a tubular core and radiating sheds. The sleeve is molded in a first configuration and, when the core is radially stretched, assumes a second configuration in which the sheds assume a downwardly extending configuration. The sheds, in the second configuration, include an upper surface having a generally frustoconical shape. The housing may be made using conventional molding techniques, but requires substantially less material than if the housing were molded directly into the second configuration.
Claims29
An elastomeric housing for electrical apparatus, comprising a deformable shedded sleeve having a central axis and comprising a tubular core portion with a central bore and a plurality of axially-spaced sheds extending from said core;
- wherein:
- said core is unstretched when formed and is stretched when an electrical device is inserted in the central bore to form an electrical apparatus, and said sleeve has a first configuration when said core is unstretched and a second configuration when said core is stretched;
- said sheds extend from said core at a first angle relative to said axis when said sleeve is in said first configuration and extend from said core at a second angle relative to said axis when said sleeve is in said second configuration;
- said sheds extend substantially perpendicularly from said core when said sleeve is in said first configuration and said sleeve assumes said second configuration when said core is stretched radially outwardly;
- and
- when said sleeve is in said first configuration, said sheds include an upper surface that joins said core in a first shoulder having a radius of curvature R1 and a lower surface that joins said core in a second shoulder having a radius of curvature R2, with R1 being grater than R2.
A housing for electrical apparatus, comprising:
- an elastomeric sleeve having a tubular core portion with a central axis and a central bore and having a plurality of sheds radiating from said core portion;
- wherein said sheds have ends disposed at a predetermined radial distance from said axis;
- wherein said sheds include an upper surface comprising a first frustoconical surface segment joined to said core portion in an upper shoulder having a radius of curvature R1 and a second frustoconical surface segment joined to said first frustoconical surface segment at a first transition point T1;
- and
- wherein said sheds include a lower surface comprising a third frustoconical surface segment joined to said core portion in a lower shoulder having a radius of curvature R2 that is less than R1 and fourth frustoconical surface segment joined to said third frustoconical surface segment at a second transition point T2 that is radially closer to said axis than T1.
An elastomeric housing for electrical apparatus, comprising:
- a deformable shedded sleeve having a central axis and comprising a tubular core with a central bore having an inside diameter and a plurality of axially-spaced sheds having upper and lower surfaces and radiating from said core in a first configuration when said core is unstretched, wherein said sheds extend substantially perpendicularly from said axis when said sleeve is in said first configuration;
- said sleeve being deformable from said first configuration when said core is unstretched to a second configuration when an electrical device is inserted in the central bore to form an electrical apparatus in which said sheds assume a downwardly extending position and said upper surface of said shed is generally frustoconical;
- and
- when said sleeve is in said first configuration, said sheds including an upper surface that joins said core in a first shoulder having a radius of curvature R1 and a lower surface that joins said core in a second shoulder having a radius of curvature R2, with R1 greater than R2.
Dependencies are inferred from the claim text.