| 摘要 |
PURPOSE:To make it possible to easily replace a core pin without disassembling a mold by a structure wherein slidable supporting bars equipped with openings, through which core pins an be drawn out, are arranged and, in addition, each core pin is energized upwards at all times by a spring. CONSTITUTION:Supporting bars 24 are arranged slidably lengthwise respectively at positions B1'-B4', which coincide with lateral groves 21 in a plane. In addition, supporting bars 25 are arranged slidably lengthwise respectively at positions A1'-A4', which coincide with longitudinal grooves 21 in a plane, below the supporting bars 24 and above each core pin holding pin 18. In this case, both end parts of the supporting bars 24 are held down by bar keep plates 26. Further, openings 27 are made at the same pitch as that in the arrangement of core pins 13 respectively on the supporting bars 24 and 25 so as to be able to draw out the core pin through the openings 27.
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