Patent ID: 9375868
Filing Date: 2016-06-28
CPC Classification: B29C,B29K,B29L,F16L

Claim Text:
1. A method for making a connector member by injection molding of a synthetic resin, the connector member comprising a hollow pipe-shaped portion and two ring-shaped seal grooves disposed at an outer peripheral surface of the pipe-shaped portion, the method comprising: preparing a metallic mold comprising a cavity mold having an inner surface shape that forms an outer surface shape of the connector member and a core mold having an outer shape that forms an inner surface shape of the connector member, the metallic mold defining a cavity where the connector member is to be formed and having a gate for supplying the synthetic resin to the cavity; closing the metallic mold to form the cavity so that the gate is formed; injecting the synthetic resin from the gate to the cavity to form the connector member; opening the metallic mold to remove the formed connector member; and removing the synthetic resin formed in the gate from the connector member, wherein the gate is a ring-shaped gate defined by the cavity mold and an end surface of the core mold, the gate is connected to the cavity at an inner peripheral surface of the pipe-shaped portion and at a region close to a pipe end of the pipe-shaped portion with respect to the seal groove, the synthetic resin is cylindrically supplied from the gate to the cavity in the injecting step, the connector member further comprises a plurality of the pipe-shaped portions disposed approximately parallel and a plate-shaped coupling portion that couples the plurality of pipe-shaped portions to each other, the metallic mold further comprises a plurality of the ring-shaped gates, the plurality of pipe-shaped portions and the coupling portion are integrally molded, and each of the plurality of ring-shaped gates is connected to the cavity where each of the plurality of pipe-shaped portions is to be formed.