Patent ID: 6196829
Filing Date: 2001-03-06
Classification: B29C

Abstract:
An apparatus for forming a hollow article comprising:an extrusion device disposed at a fixed location, which includes at least one extrusion head and extrudes downward a parison from said extrusion head, said parison being formed of a thermoplastic material softened by heating;two blow molding units having a carriage, one end portion of which is supported by a swinging fulcrum so as to swing, a blow molding mold disposed on said carriage, and an open-close device allowing said blow molding mold to perform an open-close operation, wherein each blow molding mold is divided into at least two, and has mold components for defining a cavity showing an outline which conforms to the external shape of said hollow article in a state where said mold components are made to be in a mold closed state by being driven by said open-close device;a swing-driving device for driving each blow molding unit so as to swing around corresponding swinging fulcrums, allowing each blow molding mold to occupy a receiving position, a shunting position for avoiding interference of one blow molding unit with the other blow molding unit, and a detaching position, said detaching position and said shunting position being located on one side of a central line of said extrusion device; anda clamping device having two seizing portions corresponding to said detaching position, whereby each blow molding mold receives said parison in a common receiving position, is driven by said open-close device so as to be in a closed mold state, and moves from said receiving position to said shunting position via said detaching position, and thereafter, each blow molding mold is returned to said detaching position, and driven by said open-close device so as to be in an opened mold state, and a hollow article which is formed by blow molding said parison in said blow molding mold is taken out by said clamping device, and moved to said receiving position as kept in said opened mold state.