Center position device for a mold

A center position device for a mold comprising:

• a plurality Of engagement blocks;
• a headless tubular bolt;
• an annular permanent magnet;
• an outer housing having an inverted U-shaped cross-section, an open lower side, a closed upper side, a plurality of view holes space apart equidistantly around a center through threaded hole, a center tubular wall defining said center through threaded hole opening to said closed upper side and extending down from the center of said closed upper side, said center through threaded hole engaging with a sleeve tubular bolt, a vertical peripheral surface provided with a plurality of dovetail-shaped grooves spaced apart equidistantly for said plurality of engagement blocks to engage therewith, said sleeve tubular bolt having an inner female thread for said headless tubular bolt to engage therein;
• an inner housing of an inverted U-shaped cross-section fitted in said outer housing, having an open lower side, a closed upper side with a center hole for said center tubular wall of said outer housing to pass through, and an inner annular cavity for said annular permanent magnet to fit therein;
• a disc with an annular projecting-down wall made of a magnetic material and fixed under said permanent magnet, and secured in place with two washers to close and form a flat surface at the open lower side of said outer housing;
• said permanent magnet forming two annular magnetic bands in said lower side of said outer housing to permit said center position device to be attracted to an outer surface of a mold, a correct pin being fitted in a lower portion of said headless tubular bolt and being movable to protrude in an injecting hole of said mold, whereby said headless tubular bolt is screwable by a wrench to position said correct pin, and whereby when said mold is hung up and moved to a mold wall of an injecting molding machine, said center position device is fitted in a threaded rod hole of said mold wall so that said threaded rod hole is correctly aligned to said injecting hole of said mold;
• and
• said correct pin being elastically urged by a spring placed on said correct pin so as to protrude in said injecting hole of said mold, and said headless tubular bolt having a wrench groove with a pin on an upper end section for a notch of said wrench to engage therewith so that said wrench may screw said headless tubular bolt to let said correct pin move to protrude in and retreat out of said injecting hole of said mold.