Insulator comprising a holding metal fitting and a fiber reinforced plastic rod held in the sleeve of the metal fitting under pressure
AssigneeNGK Insulators, Ltd.
InventorsTakeshi Ishihara, Masaru Kojima
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Abstract
An insulator having an improved fatigue life is disclosed. The insulator comprises a fiber reinforced plastic rod and a holding metal fitting composed wholly or partly of a sleeve, which has a base portion and an inlet portion having a tapered thickness, and holds the rod in the sleeve under pressure.
Claims4
In an insulator comprising a fiber reinforced plastic rod having a substantially cylindrical outer surface and a holding metal fitting, said holding metal fitting including a sleeve having a cylindrical inner surface, said sleeve receiving an end of said rod and frictionally holding said rod by being compressed onto the rod, an improvement comprising said sleeve including a base portion having a large thickness and defining mainly the static load performance of the insulator and an inlet portion having a tapered thickness and defining mainly the vibration fatigue performance of the insulator, said inlet portion being formed at an extended portion of the base portion so as to form a unitary body having a seamless cylindrical bore together with the base portion and having a thickness gradually decreasing towards a tip for receiving the FRP rod and further satisfying the conditions that the relation between the thickness t.sub.1 of the inlet portion and the diameter d of the rod is t.sub.1 .ltoreq.d/5, and the relation between the length l.sub.1 of the inlet portion and the diameter d of the rod is d.gtoreq.l.sub.1 .gtoreq.20d;
- and the rod being frictionally held by the base portion and the inlet portion.
Dependencies are inferred from the claim text.