COLLAPSIBLE CORE

摘要

A collapsible core is provided to minimize undercut generation of product by controlling slope of collapsible core. A collapsible core comprises a holder(20) in which a penetration hole(21) of which the top is broad and the bottom is narrow is formed, an elastic member(11) which is notched to the cross is set up in the top of the holder so that product can be separated by expansion or contraction through the penetration hole, and an elastic core(10) whereof a male screw(12) is formed in the lower part and a fixing groove(12a) is formed in the center thereof. A female screw(31) of which the top is open is formed to couple with the male screw of the elastic core. An anchoring bolt(40) is fastened to the fixing groove through a bolt hole(32) formed in the outer circumference.