Dual piston valve stem actuator
US7467941B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 2007 |
| Grant date | Dec 23, 2008 |
| Priority date | — |
| Expiry date | Aug 28, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/2889
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An injection molding apparatus includes a valve support structure having an internal channel for directing a flow of melted resin to a mold cavity. A first valve actuator is supported by the valve support structure and is operatively connected to a valve stem. The valve stem extends at least partially through the internal channel through a valve aperture. A bushing is fitted in the valve aperture. A second valve actuator is located adjacent the first valve actuator. The second valve actuator is operatively connected to a sleeve member with a hollow interior dimensioned to slidingly engage the valve stem and an exterior surface dimensioned for sliding movement in the bushing. The second valve actuator selectively moves the sleeve member between a retracted position where the sleeve member moves toward the bushing and an extended position where the sleeve moves away from of the bushing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.