Patent ID: 7065999

Claim:
A bending roll apparatus for manufacturing a pipe, comprising: (a) a core roll formed from a metal having an elongated circumference surface; (b) a plurality of push rolls formed of an elastic material disposed around the core roll to hold the core roll by holding the core roll at a plurality of positions of the elongated circumference surface of the core roll and to form a contact portion; (c) a tension roll disposed for tensioning a guide belt; (d) said guide belt having an inner surface and an outer surface and possessing elasticity, wherein said guide belt is continuous and is wound on the push rolls and on the tension roll by said inner surface and on the core roll by said outer surface such that at least a portion of the elongated circumference surface that is on a side opposite to the tension roll is not wound over by said guide belt, wherein said guide belt is synchronously driven with the core roll, and wherein a metal sheet can be fed into the contact portion and bent around the core roll to form a shape of pipe.