Patent ID: 6367765
Filing Date: 2002-04-09
Classification: B22C,B22D,B29C,Y10S

Abstract:
A mold for molding a hardenable material comprising:a recessed mold surface that defines a mold cavity that receives the hardenable material; a passageway having an opening in gas flow communication with the mold cavity; and a vent disposed in the passageway that is constructed and arranged to permit gas or vapor to flow through the vent but oppose flow of hardenable material through the vent, wherein the vent comprises a perforate vent insert that is disposed in the passage, the insert having a plurality of vent passages and the vent insert comprised of a first grate portion that engages with a second grate portion, wherein each vent passage is constructed and arranged to permit gas or vapor flow through the vent insert but opposing flow of hardenable material through the vent insert, and wherein the vent insert is comprised of a plurality of spaced apart slots that each communicate with one of the vent passages in the vent insert, with at least one of the vent passages including a chamber that is disposed adjacent the passageway and a plurality of vent passage sidewalls that taper away from each other from adjacent the slot associated with the vent passage toward the passageway.