Demolding mechanism for molded article having internal thread

A demolding mechanism for demolding a molded article with inner thread, the demolding mechanism comprising:

• a sleeve comprising:
• a plurality of spring legs, one end of each leg comprising an external thread;
• and
• a hollow cylindrical sleeve body connected to the plurality of spring legs;
• and
• a core comprising:
• an end portion comprising a central portion and a plurality of ribs evenly spaced from each other, protruding from the central portion, and each of which is received between two of the spring legs;
• and
• a cylindrical shank connected to the end portion, the shank having a diameter smaller than a diameter of the sleeve body;
• wherein the sleeve is unidirectionally and slidably sleeved on the core, a distal end of each spring leg and a distal end of the end portion are flush with each other, the sleeve is slidable along the core, and when the spring legs move away and disengage from the ribs, the spring legs are configured to deflect inwardly, thereby enabling the external thread thereof to disengage from the inner thread of the molded article.