A heavy duty, locked, tubular quick coupling used for coupling oil and gas well tubing or pipe joints, thus allowing long strings of pipe and tube joints subsequently connected to at least one such quick coupled joint to be lifted as a string, thereby applying tensile loading to the quick coupled joints....http://www.google.co.uk/patents/US6764103?utm_source=gb-gplus-sharePatent US6764103 - Method and apparatus for locking a tubular quick coupling
