Importance

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Abstract

An upper core 25 and a lower core 23 are set in a core material forming mold 21, a synthetic resin in a molten state is injected into a cavity 27 through a gate 26 and, thereafter, the core material which includes an upper hollow portion 5a having an upper opening 7 which opens upwardly and a lower hollow portion 5b having a lower opening 11 which opens downwardly is formed by molding, an upper cap 9, a lower cap 13 and a display plate 109 are mounted on the core material 3, a projecting portion 37 of the upper cap 9 is fitted into a recessed portion 37a of an upper mold 39 thus forming an upper engaging portion, a pin 31a of a lower mold 31 is fitted into a recessed portion 13a of the lower cap 13 thus forming a lower engaging portion, the core material 3 is vertically fixed to the inside of the cavity 28 while maintaining a gap 28a around the core material 3, and a molten resin is injected into the gap 28a through a gate 51 thus forming the skin portion 15 and integrally covering the upper cap 9, the lower cap 13 and the core material 3 with the skin portion 15.

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First Claim