US Patent 7997626 Pipe coupling with auxiliary clamp

A pipe coupling including at least one annular clamp housing at an end of a body, the at least one annular clamp housing having an opening for inserting therein a pipe and including clamp members and a tightening element that fastens and tightens the clamp members towards each other in a direction transverse to an axial length of the body so as to apply a radially-inward clamping force on a pipe inserted in the opening, at least one auxiliary clamp including auxiliary clamp members located near the at least one annular clamp housing, and an auxiliary tightening element that fastens and tightens the auxiliary clamp members towards each other in a direction transverse to the axial length of the body so as to apply a radially-inward clamping force on the pipe inserted in the opening.