Method for blow molding a CVJ boot
US5900205A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1996 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Aug 8, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D3/2055
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A blow molded product which is generally tubular having first and second open ends and, a bellows section intermediate said first and second ends so that said product is flexible, has a skirt adjacent one of said first and second ends. The bellows section is formed in a blow molding operation and the skirt section is formed by compression molding. A preferred embodiment of the product has a rib extending internally of the wall of the blow molded section to strengthen the transition region between the bellows section and the compression compresses the steps of confining a parison in a mold and then introducing a core into the parison in the mold. The core moves thermoplastic material axially and possibly also radially and circumferentially. This process enables molding of a product with an external surface which may be substantially cylindrical with an internal surface which has lobes, ribs or other internal projections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.