Patent ID: 7943853
Filing Date: 2011-05-17
Classification: H01B,Y10T

Abstract:
1. A method for manufacturing a post insulator, the method comprising: winding a thin cord-like member substantially helically around a core of an insulating material with a large pitch angle, introducing the core into a tube of an insulating stiff material so as to occupy substantially an entire inner volume of the tube, the cord-like member acting as a spacer for obtaining said space between the core and the inner walls of the tube leaving a small circumferential space separating the core and inner walls of the tube, closing the tube at two ends thereof, introducing an adhesive into the tube through a first opening in one of said ends while establishing a second opening at an opposite end of the tube for allowing air to escape from an interior of the tube as said adhesive is introduced, closing said second opening when no more air is coming out thereof, continuing the introduction of adhesive into the tube under overpressure until a pressure to be applied for introducing more adhesive into the tube exceeds a predetermined level, closing said first opening, and curing the adhesive while maintaining an overpressure in the interior of the tube.