Patent ID: 7967597

Claim:
A combination, comprising: a mold base defining a mounting hole therein, the mounting hole extending through the mold base, and the mounting hole including an upper portion and a lower portion in sequence along the extending direction thereof, a diameter of the upper portion being greater than that of the lower portion, a step being formed at an inner surface of the mold base; a mold core mounted in the mold base, the mold core being not rotatable relative to the mold base, the mold core defining a threaded hole therein, and the mold core including an upper portion arranged on the step of the mold base with a diameter thereof being substantially the same as that of the upper portion of the mounting hole, and a lower portion with a diameter thereof being substantially the same as that of the lower portion of the mounting hole; a supporting member mounted on the mold base, the supporting member including a base and a plurality of sidewalls extending from the base to the mold base, a height of the sidewalls being greater than that of the lower portion of the mold core, the base of the supporting member defining a through hole in alignment with the threaded hole of the mold core; and a bolt having a threaded rod and a head formed at one end of the rod, the head being arranged at an opposite side of the supporting member to the mold core, the threaded rod extending through the through hole and threadedly engaged in the threaded hole of the mold core, the bolt being configured for moving the mold core to disengage from the mold base by rotation of the threaded rod in the threaded hole of the mold core.