Pre-assembly muff for the cutting or clamping ring of a pipe coupling
US4958859A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1989 |
| Grant date | Sep 25, 1990 |
| Priority date | — |
| Expiry date | May 1, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L19/10
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pre-assembly muff (12; 12a) for fitting a cutting or clamping ring (3) of a pipe coupling. Conventional muffs have a problem in that in service their dimensions change so that an accurate ring assembly ensuring accurate functioning is no longer possible. Only by checking the dimensions of the inner cone (13) of the pre-assembly muff is it possible to determine whether the end of the service life has been reached. The muff according to the invention has a wear resistant coating applied to its inner cone (13). The coating has a color which differs from that of the base material. If due to frequent use the colored coating is removed, the base material shines through. This is a sign for the user indicating that the end of the service life of the pre-assembly muff has been reached.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.