METHOD OF SUPPORTING GLASS BASE MATERIAL AND SUPPORTING PIN

摘要

A support pin -which is to be inserted into a pin insert hole formed in a seed rod provided at an upper end of a glass preform and suspends and supports the glass preform-is formed by coupling a pin main body having a flange section, a first shaft section, a second shaft section, and a male screw section with an auxiliary pin member having a flange section, a shaft section, and a female screw section. The first and second shaft sections of the pin main body and the shaft section of the auxiliarypinmember are providedwith claddings which are formed from synthetic resin and have elasticity. The support pin is formed so that the second shaft section of the pin main body covered with the cladding can be inserted into the pin insert hole formed in the seed rod.