Self cleaning injection molding pin

An injection molding apparatus comprising:

• a mold body defining a mold cavity for forming a part;
• a source of fluent plastic connected to said mold cavity;
• a pressurized fluid system for delivery and evacuation of pressurized fluid from said mold cavity;
• at least one fluid injection pin operable to fluidly connect said pressurized fluid system to said mold cavity, said pin comprising a pin body defining a fluid passage and a shaft member reciprocable in said fluid passage, and further comprising adjustable biasing means for biasing said shaft member toward said retracted position.

A pin for a fluid assisted injection molding apparatus comprising:

• a pin body having an outlet;
• a shaft member reciprocable in said pin body between a retracted and an extended position, said shaft member having a tip with a shaped recess;
• a tensioning member threadedly received on said shaft member;
• a biasing member abutting said pin body and abutting said tensioning member and biasing said shaft member toward said retracted position;
• wherein
• said shaft member is rotatable relative to said tensioning member in alternate directions, said shaped recess facilitating rotational manipulation thereof with a complementary tool.