| 摘要 |
PURPOSE:To prevent the off-center of a core at secondary molding by forming, on the central axial line of a spacer, a recessed part with which a positioning pin makes contact at secondary molding in a molding die. CONSTITUTION:On the upper and lower surfaces on the central axial line of a cylindrical spacer 10, conical recessed parts 11a, 11b are formed. At manufacturing, a primary molding is supported in two positions of the lower part of a core 1 exposed to the outside and the recessed part 11a (or 11b), and received in a die, and a resin is injected into the die. Thus, a secondary molding in which the central axial line of the core 1 is off-center is never formed. |
