Metering device for a nozzle of an injection molding apparatus
US6884061B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2002 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | May 1, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2945/76381
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An injection molding apparatus includes an injection piston that is slidable within a nozzle having a movable valve gate pin. The injection piston is movable from a retracted position to an extended position in order to force melt towards a mold cavity. A valve is located at a forward end of the piston to selectively block communication between a recess, which is provided in an outer wall of the piston adjacent the valve, and a melt chamber of the nozzle. Movement of the injection piston from the retracted position to the extended position causes the valve to close so that the predetermined volume of melt located below the valve is forced into the mold cavity, when the valve gate pin opens the mold gate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.