Hollow, resin mechanical part having a shaft integrally formed therewith and an injection molding method for producing the same
US5773109A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1996 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Jun 13, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/139
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is a hollow, resin mechanical part having a shaft integrally formed therewith, comprising a hollow, integral, functional segment-shaft structure comprising at least one functional resin segment, and a resin shaft coaxially, integrally formed with the functional segment, wherein the integral segment-shaft structure satisfies the relationships defined by the following formula 0.9.ltoreq.L(b)/L(a).ltoreq.1, in which L(a) represents the entire length of the integral segment-shaft structure, and L(b) represents the length of the hollow. The mechanical part of the present invention has not only high dimensional precision and excellent material-recycling characteristics, but also can be produced with high productivity, and is very useful in various fields, such as automobiles, ordinary machinery, precision machinery and electric and electronic equipment. Also disclosed is a hollow injection molding method for efficiently producing this mechanical part, comprising injecting a molten resin into a mold cavity through the gate to form a molten resin mass, and introducing a hollow-forming fluid under pressure into the molten resin mass through the gate, wherein the gate is located in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.