Pre-assembly muff for the cutting or clamping ring of a pipe cou

Details Pre-assembly muff for the cutting or clamping ring of a pipe cou Pre-assembly muff for the cutting or clamping ring of a pipe cou

1989-05-01

1990-09-25

Arola, Dave W.

Pipe joints or couplings

With assembly means or feature

Particular tool-engaging means or with tool

285 93, 2853827, F16L 3500

Patent

active

049588591

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.

REFERENCES:
patent: 2139413 (1938-12-01), Kreidel
patent: 2230116 (1941-01-01), Kreidel
patent: 2414995 (1947-01-01), Wurzburger
patent: 3643984 (1972-02-01), Bulleri
patent: 4630851 (1986-12-01), Ogawa

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