Patent ID: 7788950
Filing Date: 2010-09-07
Classification: C03B

Abstract:
1. A pressing plunger apparatus for forming a parison in a glassware forming machine, by a blow-and-blow process or a press-and-blow process, comprising: an arrangement of multiple cylinder and piston assemblies for each cavity, placed at a so named blank mold “zero-line” position which is a constant position independent of the size of the blank mold, a parison and a finished article; a pressing plunger ( 209 ) driven by said arrangement of cylinder and piston assemblies, for forming an entire parison by introducing the pressing plunger for a whole run through a transferable and open-able neck ring mold, and retiring it once the entire parison has been formed by the press-and-blow process, or introducing the pressing plunger for a short run through a transferable and open-able neck ring mold to form a neck ring of the parison and retiring it for providing a counter-blow for forming the entire parison by the blow-and-blow process; and fluid feeding means at the arrangement of cylinder and piston assemblies, for feeding cooling and operating fluid from an external source, wherein the arrangement of multiple cylinder and piston assemblies for a press-and-blow process includes: a first cylinder and piston assembly ( a first cylinder ( and a bottom end cap retained on an integral fluid network plate for admission of operating fluid and cooling fluid for extending the stroke of the first annular piston, and a central conduit for feeding cooling fluid; the first annular piston into the first cylinder, defining a lower chamber for extending this first annular piston, in combination with a releasing of the retraction of the second cylinder and piston assembly, at a charging position, in a press-and-blow process or a neck ring forming position in a blow-and-blow process, defining an upper chamber for retracting the first annular piston, said first annular piston having a hollow piston rod acting as a second internal cylinder for a second cylinder and piston assembly, an upper internal screwed portion and a lower integral internal bushing ( a first fixed sealing sleeve mounted on a bottom cap, for slide sealing the first annular piston and the lower integral internal bushing ( a first end cap rod bushing having an external screw portion to be screwed to the upper internal screw portion of the first cylinder, for limiting the extended stroke of the first piston and guiding the hollow piston rod, and passages communicated with the passages of the first cylinder and piston assembly ( a second end cap rod bushing having first fluid passages for providing fluid for the extended stroke of a third final pressing piston, and second fluid passages, for providing operating fluid for a second piston at its retracted stroke at a chamber of the second cylinder and piston assembly, said fluid passages being fluid fed through external telescopic tubing through said second end cap rod bushing, said second end cap rod bushing having shock absorbers, at its upper end, and a lower external screw portion, screwed to the upper internal screwed portion of the hollow piston rod, to be lifted by said hollow piston rod when the first piston is actuated to its extended stroke limited by the first end cap rod bushing; a guiding sleeve mounted on a second end rod bushing by means of an annular bipartite retention flange, for guiding a release and guide member, and including a first internal spring having a lower end abutting against the flange over the second end rod bushing and an upper end connected with an upper external step ( a pulling sleeve including the upper external step in which abuts the upper end of the first internal spring, and a second internal lower step for defining said charge position; a floating guiding sleeve having an external conical upper end to be centered regarding the transferable and open-able neck ring mold, an intermediate external annular shoulder and a lower end which guides the pressing plunger ( the release and guide member having a lower end abutting against the upper end of the second external spring, and an upper end having an external screw portion, defining a floating housing for the floating guiding sleeve, which can be moved in a horizontal plane but not in the vertical plane, to assure aligning with the transferable and open-able neck ring mold; a retaining bushing having an external annular shoulder abutting against an upper end of the guiding sleeve, to be retained by screws and an annular step, in order to limit the stroke of the release and guide member; and a cap end having a first annular step abutting against the release and guide member defining the floating housing, and an internal screw portion which is screwed to the external screw portion of the release and guide member; in this way, for mounting or demounting the pressing plunger (