Injection molding nozzle
US6726467B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 2002 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Oct 16, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/2791
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Multi-cavity injection molding apparatus includes a plurality of injection nozzles, each of which has a two-piece tip assembly in the nature of a replaceable tip and a retainer that detachably secures the tip to the nozzle body. The retainers are constructed from material having a lower coefficient of thermal conductivity than the tips so that the retainers also serve to insulate the tips from the relatively cold, surrounding heat sink presented by the mold. Although each retainer prevents its tip from being unintentionally axially released from the nozzle body, the retainer engages the tip at only two axially spaced locations along its length so as to present an insulating air gap in surrounding relationship to much of the tip. The otherwise exposed end of the air gap is sealed off when the nozzle is hot by virtue of a sealing collar on the retainer that progressively tightens against the cooperating, beveled surface of the tip as the tip heats up. Each nozzle is mounted on the manifold block in a ball and socket relationship so that the nozzles can swivel and self-align as the manifold block and nozzles heat up from room temperature to operating temperature at the commencement of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.