Method and apparatus for forming molded plastic articles
US5976452A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1997 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Nov 5, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C49/5603
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus wherein an extruder provides extruded plastic parisons to a first and second horizontally movable blow mold assemblies, and each blow mold assembly includes two sets of blow molds, and each set includes a pair of blow mold halves. The blow mold halves are closed about the tubular parisons and moved to one of two blow molding stations where a blow pin at the blow molding station blows the parison to form a hollow blow molded article. More specifically, four platens are provided in each blow mold assembly. A first pair of outer and inner platens supports the first pair of blow mold halves and a second pair of outer and inner platens supports the second pair of blow mold halves. A pair of tie rods passes through all four platens. The first outer platen is attached to the ends of the tie rods. The second outer platen is moved by a mechanism such as a cylinder or toggle mechanism for movement on the tie rods. The first inner platen is connected to the second outer platen by a second set of tie rods. The second inner platen is connected to the first outer platen by a third set of tie rods. When the first assembly of open blow mold sets is brought into position adja…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.