High tensile strength suspension insulators with multi-step embedded pins
AssigneeNGK Insulators, Ltd.
InventorsHiroshi Nozaki, Haruo Inoue
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Abstract
The suspension insulator of the present invention has an improved shape of the embedding portion of a metal pin, which is an embedding multi-step portion constructed with an inverted spherical convex trapezoid upper expanded portion having a larger surface at the top end and an inverted frust-conical lower expanded portion succeeding to the upper expanded portion. By using such a metal pin, the stress distribution of the insulating body is made uniform and therefore a small size and light weight of suspension insulator having high tensile strength is obtained.
Claims2
In a suspension insulator in which an embedding portion provided at a top end of a metal pin is embedded in and secured to a pin assembling hole provided in an insulating body with a cement, the improvement comprising constructing said embedding portion with an inverted spherical convex trapezoid upper expanded portion having a larger surface at the top end and at least one inverted frusto-conical lower expanded portion succeeding to the upper expanded portion, wherein a curvature radius of a side surface of the inverted spherical convex trapezoid upper expanded portion is 40-80% of a diameter of said larger surface, and a taper angle .theta. of a side surface of the inverted frusto-conical lower expanded portion is 15.degree.-35.degree..
Dependencies are inferred from the claim text.