Electrofusion fitting
US8424917B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2008 |
| Grant date | Apr 23, 2013 |
| Priority date | — |
| Expiry date | Aug 13, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C65/3476
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A moulded electrofusion fitting for connection to a plastics pipeline comprises a hollow body formed with a tubular opening that has a longitudinal axis and is adapted to receive and end of the pipeline as a close sliding fit. An electrofusion element is formed in the internal surface in the opening, spaced from its end. Fingers are on the end of the opening, circumferentially spaced around the opening and separated by slots between them. Cam surfaces in the form of ribs are defined on the fingers, and a grip ring is received on the fingers and includes wedge elements in the form of grooves. These are adapted to fit the ribs so that, when a pipeline is inserted in the opening and the grip ring is rotated about said axis, the ribs and grooves engage to press the fingers radially inwardly against the reaction of the grip ring, whereby said pipe is gripped by said grip ring and centralized in the opening. The grip ring may be integrated with a terminal pin, a bayonet slot of the grip ring accommodating the terminal pin, a shroud boss formed on the grip ring around the base of the bayonet slot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.