Importance

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Abstract

A coupling comprises a tubular insert (20), having an external shoulder (22) and external circumferential projections (26) separated by circumferential grooves (28, 30), and a tubular sleeve (14) having a largest internal diameter less than the external diameter of a pipe (10). The sleeve is advanced over the end (12) of the pipe and along the pipe away from the end. The pipe is constricted as the sleeve passes over it and then subsequently recovers to establish an end portion (18) which is unconstricted. The outside diameter of the insert is preferably not greater than the inner diameter of the pipe and the insert is inserted into the end portion of the pipe, the end of the pipe engaging the shoulder. The sleeve is then subjected to relative movement between said sleeve and said end until the end portion is gripped between the projections and the sleeve. The end of the sleeve preferably engages the shoulder (22). The coupling enables the pipe to be connected to other pipework.

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First Claim