Injection molding device
US6659754B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 2002 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | May 15, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2101/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In an injection molding device used to inject a thermoset casting resin into a mold wherein the device includes a source of resin, a mold for receiving and curing the resin, a delivery vessel for injecting the resin into the mold, and a conduit in fluid communication between the mold and the delivery vessel, the improvement being a uniquely-configured piston for injecting the resin wherein the moveable end of the piston ram is substantially cone-shaped with the vertex of the ram cone extending toward the distal end of the ram body from which the casting resin is injected through the conduit into the mold. The interior, distal end of the ram body is also substantially cone-shaped, with the vertex of the body cone extending inwardly in opposed relation to the ram cone. In addition, the improvement is characterized by the construction of the outer body of the piston from plastic and by covering the exposed surface of the ram cone with rubber, whereby static electricity is generated as the ram cone advances toward the body cone, such that gas bubbles existing within the resin will be attracted to the plastic material forming the body, away from the delivery aperture formed through the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.