Patent ID: 7516636

Claim:
A device for forming a circumferential groove in a pipe having an inner and an outer surface, said device comprising: a first roller tool rotatable about a first axis of rotation and having a first circumferential surface engagable with said outer surface of said pipe, said first circumferential surface being defined by first and second edges oppositely disposed, said first circumferential surface being oriented substantially parallel to said first axis of rotation and having a first mid point positioned half way between said first and second edges; and a second roller tool rotatable about a second axis of rotation in spaced relation to said first axis of rotation, said second roller tool having a second circumferential surface facing said inner surface of said pipe opposite to said first roller tool, said second surface having first and second ends oppositely disposed, said second surface being oriented substantially parallel to said second axis of rotation and having a second mid point positioned half way between said first and second ends, said first mid point being offset lengthwise along said first axis relatively to said second midpoint, said first and second roller tools cooperating to form said groove.