Patent ID: 7175421
Filing Date: 2007-02-13
Classification: B29C,Y10S

Abstract:
1. A slide core unit to be installed in a mold configured to be openable and closable and having at least a pair of mold members which form a molding space when in a closed state, wherein said slide core unit comprises: a slide core disposed to be movable in forward and backward directions toward and away from said molding space and driven in a forward direction toward said molding space at least in response to a closing action of said mold; and guiding means installed on at least one of said mold members and supporting said slide core to be movable in the forward and backward directions toward and away from said molding space, and one member out of said slide core and said guiding means is provided with urging means for urging said slide core relative to said guiding means in a backward direction away from said molding space, said urging means comprising a guide hole bored in said one member and extending in the forward and backward directions, a moving piece provided in said guide hole to be movable in the forward and backward directions, an elastic body provided in said guide hole and giving an elastic force to said moving piece, a long hole penetrating the other member, different from said one member, out of said slide core and said guiding means from within said guide hole and formed long in the forward and backward directions, and a pin which is inserted into said long hole and of which the base end is fixed to said moving piece and the tip protrudes toward said other member, and said other member is provided with a concave portion with which the tip of said pin is to engage, and said elastic body is disposed within said guide hole to urge said slide core in the backward direction with an elastic force working via said moving piece.