Method of injection blow molding synthetic resin bellows product
US5236656A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1991 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Sep 18, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/703
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of injection blow molding a synthetic resin bellows product having root portions and crest portions, each of which has the axially sectional form of a circular arc, and incline portions therebetween, for example, a plastic bellows product such as a constant-velocity joint boot, a steering boot or the like. The method is capable of molding a product having a thickness uniform throughout, and particularly, root portions having little dimensional variations. The method involves firstly molding the parison root portions or the root portions plus their adjacent areas into substantially the same shape as those of a final product by injection molding during molding of a parison, and then blow molding only the crest portions and the incline portions to obtain the shape of the final product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.