Patent ID: 7127928

Claim:
An apparatus for pipe bending, which comprises: a core bar including first and second cylindrical core bar portions respectively having first and second ends, the first and second ends having a common axis and telescopically sliding along the common axis, the first and second cylindrical core bar portions pivoting relative to each other about the telescopically sliding first and second ends, the first cylindrical core bar portion being pivoted at a angle relative to the second cylindrical core bar portion to form a bending region about the telescopically sliding first and second ends, and an outside circumferential surface of the bending region being a curved surface, the core bar being arranged in a pipe; and an outer clamping member arranged on an outer bending surface of the pipe adjacent the bending region and an inner clamping member arranged on an inner bending surface of the pipe adjacent the bending region, the outer and inner clamping members holding the pipe therebetween; and during bending of the pipe, the outer clamping member pressing the outer bending surface of the pipe toward the bending region and the inner clamping member pressing the inner bending surface of the pipe away from the bending region.