Mandrel for making elastomeric articles
US4797081A · kind A · utility
Inventor
Key dates
| Filing date | Mar 10, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Mar 10, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/044
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A one-piece mandrel for making elastomeric articles by a dipping process has a one-piece body which includes at least one opening extending therethrough. A split extends from the opening through a cross-section of the one-piece body. At least a portion of the body adjacent the split is formed of an elastically resilient material to allow the split to open for removal of the elastomeric article after formation, and to cause the split to self-close after removal of the article from the mandrel. Closure of the split forms a substantially continuous molding surface in the immediately vicinity of the split. Proper alignment of the mating surfaces of the split is assured by irregular (non-planar) design of the split surfaces, or by use of an alignment element embedded in the mandrel. In embodiments where a ferro-magnetic alignment element is used, a separate magnetized element may also be embedded in the mandrel to assist in holding the split closed during the dipping process. If necessary or desired, both elements may be magnetized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.