Patent ID: 6811732
Filing Date: 2004-11-02
Classification: H01B

Abstract:
A method of producing a polymer insulator having a core, an overcoat member arranged on the core, and a fitting member for securing the core at both ends, wherein the core and the fitting member are secured under pressure at both ends of the core by contacting a ring-shaped protrusion portion arranged at both ends of the overcoat member to an open inner end of the fitting member, comprising the steps of:forming the overcoat member on the core to define at least a sheath portion of the polymer insulator; cutting the overcoat member of the polymer insulator at the sheath portion thereof to a predetermined length after the overcoat member is formed on the crew; arranging a large diameter portion having a diameter larger than that of the sheath portion by cutting a root portion of a shed portion of the overcoat member faced to the cut end portion; processing the large diameter portion to form the ring-shaped protrusion potion to have a diameter larger than that of the sheath portion integrally with the overcoat member; and securing the fitting member.