Fabricated steel lug pipe repair clamp

A fabricated steel interlocking lug pipe repair clamp comprising:

• a tensioner bar lug having an axially and generally tangentially disposed body and two pair of tangentially disposed, radially oriented tensioner bars, said tensioner bars having and outer portion and a lug bearing surface portion, the outer portion of which are transversely mounted at a right angle upon said body;
• a stud lug having an axially disposed body spaced from said tensioner bar lug body and two tangentially disposed studs, each stud having a shank portion and a threaded portion, said shank portions being transversely mounted at a right angle upon said body of the stud lug;
• a metal band of such length as to substantially encircle a pipe and having opposing end fold portions secured within respective said tensioner bar lug and said stud lug;
• a tightening nut located on each said stud threaded end;
• a washer located on each said stud threaded end and inboard of said tightening nut;
• an axially extending washer bar located on both said stud threaded ends and inboard of said washers, said washer bar having an inward bend portion which, upon tightening of said nut extends below said tensioner bar lug body;
• each said axially disposed lug body comprising:
• a planar, elongated base plate having and outer edge and an inner portion, wherein said base plate has a central lengthwise offset, the inner portion of said base plate functioning as a backup plate, thereby forming a recess between respective tensioner bars and stud shank portions for receiving said band end fold portions;
• a planar backup plate coextensive with said base plate;
• and
• a corresponding one of said opposing metal band end fold portion securely sandwiched between said corresponding base plates and said corresponding backup plates of said tensioner bar lug and said stud lug as by welding;
• said metal band fold portion being folded around an inner side of a said corresponding backing plate;
• whereby, upon tightening said nuts said lugs are drawn together, each said tensioner bar bearing face bears against the upper surface of each said stud lug body and each said threaded end of said stud bears against the upper surface of said tensioner bar lug body.