US Patent 10422455 Pipe attachment clamp

A flange pipe terminus is attached to a mirror image terminus by a pair of pivoting C-shaped collars. The collars are locked after installation by a lever coupled to one collar that engage a radial abutment at the non-hinged end of the other collar. The lever is terminated with a swinging loop that engages a notch in the abutment. Additional security from accidental opening is provided by a secondary lock that blocks the movement of the loop or lever.