Placement ring assembly having magnetic securing means
US6371436B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Oct 23, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Oct 23, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB28B23/0043
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A placement ring assembly has inside and outside mandrels releasably fastened together to secure and align a pipe connector gasket therebetween. A permanent magnet of a magnet assembly is inserted through co-aligned openings in the mandrels and is magnetically attracted to an inner-core of a casting assembly. When the cast member is set, a mechanical release is rotated to release the magnetic attraction between the permanent magnet and the mold core. One of the mandrels may be provided with shock absorbing knockout pads while the other mandrel has openings aligned with the knockout pads to enable the knockout pads to be struck with a hammer to separate the mandrels. Rubber cushioning members absorb the shock of the impacts, protecting the mandrel from permanent damage. One-piece hole formers may likewise be provided with a magnetic assembly having a mechanic release as well as knock-out pads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.