Pressure-activated gas injection valve for an injection molding apparatus
US6099284A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1998 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | Jul 13, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/1734
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A pressure-activated valve for conducting pressurized gas into a mold cavity of an injection molding apparatus is preferably constructed as an easily replaceable unit. The preferred valve includes a pin having a flared head section. The head section has a planar face transverse to an axis of the pin so as to approximately conform to a neighboring contour of the mold cavity. The valve also includes a body in which a passageway intersects a second end of the body to define a port and a flaring seat communicates through a first end of the body between the passageway and the mold cavity. A restrainer which abuts against the second end of the body includes a guideway aligned with the passageway through the body as well as at least one cross-channel which admits pressurized gas to that passageway through the port. The pin extends through both the passageway and the guideway so that its head portion is positioned near the seat. A spring retainer threadedly engages an end portion of the pin which projects out of the guideway in the restrainer. A coiled compression spring encircling the restrainer is compressed between the spring retainer and the second end of the body so that the spring fo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.